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third-party-mirror / backupdr / e5c3fc6720beb35c5cc93edf273e0a88690a8051 / . / scst / scst / src / scst_lib.c
blob: bf7d266add0e0dfdc3f8727261b36a1ce60cae63 [file] [log] [blame]
/*
* scst_lib.c
*
* Copyright (C) 2004 - 2018 Vladislav Bolkhovitin <vst@vlnb.net>
* Copyright (C) 2004 - 2005 Leonid Stoljar
* Copyright (C) 2007 - 2018 Western Digital Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, version 2
* of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/aio.h> /* struct kiocb for kernel v4.0 */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/kthread.h>
#include <linux/cdrom.h>
#include <linux/unistd.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/delay.h>
#include <linux/vmalloc.h>
#include <asm/kmap_types.h>
#include <asm/unaligned.h>
#include <asm/checksum.h>
#ifndef INSIDE_KERNEL_TREE
#include <linux/version.h>
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27)
#include <linux/crc-t10dif.h>
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
#include <linux/sched/task_stack.h>
#endif
#include <linux/namei.h>
#include <linux/mount.h>
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
#include <linux/writeback.h>
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 18, 0)
#include <linux/t10-pi.h>
#endif
#ifdef INSIDE_KERNEL_TREE
#include <scst/scst.h>
#else
#include "scst.h"
#endif
#include "scst_priv.h"
#include "scst_mem.h"
#include "scst_pres.h"
/*
* List and IRQ lock to globally serialize all STPG commands. Needed to
* prevent deadlock, if (1) a device group contains multiple devices and
* (2) STPG commands comes to 2 or more of them at about the same time.
* In this case they will be waiting for each other to finish all pending
* commands, i.e. the STPG commands waiting for each other. Strict
* serialization is per device, so can not help here.
*
* ToDo: make it per device group.
*/
static DEFINE_SPINLOCK(scst_global_stpg_list_lock);
static LIST_HEAD(scst_global_stpg_list);
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20)
static void scst_put_acg_work(void *p);
#else
static void scst_put_acg_work(struct work_struct *work);
#endif
static void scst_free_acn(struct scst_acn *acn, bool reassign);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30)
struct scsi_io_context {
void *data;
void (*done)(void *data, char *sense, int result, int resid);
char sense[SCST_SENSE_BUFFERSIZE];
};
static struct kmem_cache *scsi_io_context_cache;
#endif
static struct workqueue_struct *scst_release_acg_wq;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 22) \
&& (!defined(RHEL_RELEASE_CODE) || RHEL_RELEASE_CODE -0 < 5 * 256 + 3) \
&& !defined(CONFIG_PPC)
static int strncasecmp(const char *s1, const char *s2, size_t n)
{
int c1, c2;
do {
c1 = tolower(*s1++);
c2 = tolower(*s2++);
} while ((--n > 0) && c1 == c2 && c1 != 0);
return c1 - c2;
}
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 22)
char *kvasprintf(gfp_t gfp, const char *fmt, va_list ap)
{
unsigned int len;
char *p;
va_list aq;
va_copy(aq, ap);
len = vsnprintf(NULL, 0, fmt, aq);
va_end(aq);
p = kmalloc(len + 1, gfp);
if (!p)
return NULL;
vsnprintf(p, len + 1, fmt, ap);
return p;
}
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 35) && \
(!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 6 || \
RHEL_MAJOR -0 == 6 && RHEL_MINOR -0 < 1)
/*
* See also "lib: introduce common method to convert hex digits" (commit
* 903788892ea0fc7fcaf7e8e5fac9a77379fc215b).
*/
int hex_to_bin(char ch)
{
if (ch >= '0' && ch <= '9')
return ch - '0';
ch = tolower(ch);
if (ch >= 'a' && ch <= 'f')
return ch - 'a' + 10;
return -1;
}
EXPORT_SYMBOL(hex_to_bin);
#endif
static int sg_copy(struct scatterlist *dst_sg, struct scatterlist *src_sg,
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
int nents_to_copy, size_t copy_len,
enum km_type d_km_type, enum km_type s_km_type);
#else
int nents_to_copy, size_t copy_len);
#endif
static void scst_free_descriptors(struct scst_cmd *cmd);
static bool sg_cmp(struct scatterlist *dst_sg, struct scatterlist *src_sg,
int nents_to_cmp, size_t cmp_len, int *miscompare_offs
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
, enum km_type d_km_type, enum km_type s_km_type
#endif
);
const struct scst_opcode_descriptor scst_op_descr_inquiry = {
.od_opcode = INQUIRY,
.od_support = 3, /* supported as in the standard */
.od_cdb_size = 6,
.od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC,
.od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ,
.od_cdb_usage_bits = { INQUIRY, 1, 0xFF, 0xFF, 0xFF, SCST_OD_DEFAULT_CONTROL_BYTE },
};
EXPORT_SYMBOL(scst_op_descr_inquiry);
const struct scst_opcode_descriptor scst_op_descr_extended_copy = {
.od_opcode = EXTENDED_COPY,
.od_support = 3, /* supported as in the standard */
.od_cdb_size = 16,
.od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC,
.od_recommended_timeout = SCST_GENERIC_DISK_REG_TIMEOUT/HZ,
.od_cdb_usage_bits = { EXTENDED_COPY, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0xFF, 0xFF, 0xFF, 0xFF, 0,
SCST_OD_DEFAULT_CONTROL_BYTE },
};
EXPORT_SYMBOL(scst_op_descr_extended_copy);
const struct scst_opcode_descriptor scst_op_descr_tur = {
.od_opcode = TEST_UNIT_READY,
.od_support = 3, /* supported as in the standard */
.od_cdb_size = 6,
.od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC,
.od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ,
.od_cdb_usage_bits = { TEST_UNIT_READY, 0, 0, 0, 0, SCST_OD_DEFAULT_CONTROL_BYTE },
};
EXPORT_SYMBOL(scst_op_descr_tur);
const struct scst_opcode_descriptor scst_op_descr_log_select = {
.od_opcode = LOG_SELECT,
.od_support = 3, /* supported as in the standard */
.od_cdb_size = 10,
.od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC,
.od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ,
.od_cdb_usage_bits = { LOG_SELECT, 3, 0xFF, 0xFF, 0, 0, 0, 0xFF, 0xFF,
SCST_OD_DEFAULT_CONTROL_BYTE },
};
EXPORT_SYMBOL(scst_op_descr_log_select);
const struct scst_opcode_descriptor scst_op_descr_log_sense = {
.od_opcode = LOG_SENSE,
.od_support = 3, /* supported as in the standard */
.od_cdb_size = 10,
.od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC,
.od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ,
.od_cdb_usage_bits = { LOG_SENSE, 1, 0xFF, 0xFF, 0, 0xFF, 0xFF, 0xFF, 0xFF,
SCST_OD_DEFAULT_CONTROL_BYTE },
};
EXPORT_SYMBOL(scst_op_descr_log_sense);
const struct scst_opcode_descriptor scst_op_descr_mode_select6 = {
.od_opcode = MODE_SELECT,
.od_support = 3, /* supported as in the standard */
.od_cdb_size = 6,
.od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC,
.od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ,
.od_cdb_usage_bits = { MODE_SELECT, 0x11, 0, 0, 0xFF, SCST_OD_DEFAULT_CONTROL_BYTE },
};
EXPORT_SYMBOL(scst_op_descr_mode_select6);
const struct scst_opcode_descriptor scst_op_descr_mode_sense6 = {
.od_opcode = MODE_SENSE,
.od_support = 3, /* supported as in the standard */
.od_cdb_size = 6,
.od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC,
.od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ,
.od_cdb_usage_bits = { MODE_SENSE, 8, 0xFF, 0xFF, 0xFF, SCST_OD_DEFAULT_CONTROL_BYTE },
};
EXPORT_SYMBOL(scst_op_descr_mode_sense6);
const struct scst_opcode_descriptor scst_op_descr_mode_select10 = {
.od_opcode = MODE_SELECT_10,
.od_support = 3, /* supported as in the standard */
.od_cdb_size = 10,
.od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC,
.od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ,
.od_cdb_usage_bits = { MODE_SELECT_10, 0x11, 0, 0, 0, 0, 0, 0xFF, 0xFF,
SCST_OD_DEFAULT_CONTROL_BYTE },
};
EXPORT_SYMBOL(scst_op_descr_mode_select10);
const struct scst_opcode_descriptor scst_op_descr_mode_sense10 = {
.od_opcode = MODE_SENSE_10,
.od_support = 3, /* supported as in the standard */
.od_cdb_size = 10,
.od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC,
.od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ,
.od_cdb_usage_bits = { MODE_SENSE_10, 0x18, 0xFF, 0xFF, 0, 0, 0, 0xFF, 0xFF,
SCST_OD_DEFAULT_CONTROL_BYTE },
};
EXPORT_SYMBOL(scst_op_descr_mode_sense10);
const struct scst_opcode_descriptor scst_op_descr_rtpg = {
.od_opcode = MAINTENANCE_IN,
.od_serv_action = MI_REPORT_TARGET_PGS,
.od_serv_action_valid = 1,
.od_support = 3, /* supported as in the standard */
.od_cdb_size = 12,
.od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC,
.od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ,
.od_cdb_usage_bits = { MAINTENANCE_IN, 0xE0|MI_REPORT_TARGET_PGS, 0, 0,
0, 0, 0xFF, 0xFF, 0xFF, 0xFF, 0, SCST_OD_DEFAULT_CONTROL_BYTE },
};
EXPORT_SYMBOL(scst_op_descr_rtpg);
const struct scst_opcode_descriptor scst_op_descr_stpg = {
.od_opcode = MAINTENANCE_OUT,
.od_serv_action = MO_SET_TARGET_PGS,
.od_serv_action_valid = 1,
.od_support = 3, /* supported as in the standard */
.od_cdb_size = 12,
.od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC,
.od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ,
.od_cdb_usage_bits = { MAINTENANCE_OUT, MO_SET_TARGET_PGS, 0, 0, 0, 0,
0xFF, 0xFF, 0xFF, 0xFF, 0, SCST_OD_DEFAULT_CONTROL_BYTE },
};
EXPORT_SYMBOL(scst_op_descr_stpg);
const struct scst_opcode_descriptor scst_op_descr_send_diagnostic = {
.od_opcode = SEND_DIAGNOSTIC,
.od_support = 3, /* supported as in the standard */
.od_cdb_size = 6,
.od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC,
.od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ,
.od_cdb_usage_bits = { SEND_DIAGNOSTIC, 0xF7, 0, 0xFF, 0xFF,
SCST_OD_DEFAULT_CONTROL_BYTE },
};
EXPORT_SYMBOL(scst_op_descr_send_diagnostic);
const struct scst_opcode_descriptor scst_op_descr_reserve6 = {
.od_opcode = RESERVE,
.od_support = 3, /* supported as in the standard */
.od_cdb_size = 6,
.od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC,
.od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ,
.od_cdb_usage_bits = { RESERVE, 0, 0, 0, 0, SCST_OD_DEFAULT_CONTROL_BYTE },
};
EXPORT_SYMBOL(scst_op_descr_reserve6);
const struct scst_opcode_descriptor scst_op_descr_release6 = {
.od_opcode = RELEASE,
.od_support = 3, /* supported as in the standard */
.od_cdb_size = 6,
.od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC,
.od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ,
.od_cdb_usage_bits = { RELEASE, 0, 0, 0, 0, SCST_OD_DEFAULT_CONTROL_BYTE },
};
EXPORT_SYMBOL(scst_op_descr_release6);
const struct scst_opcode_descriptor scst_op_descr_reserve10 = {
.od_opcode = RESERVE_10,
.od_support = 3, /* supported as in the standard */
.od_cdb_size = 10,
.od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC,
.od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ,
.od_cdb_usage_bits = { RESERVE_10, 0, 0, 0, 0, 0, 0, 0, 0,
SCST_OD_DEFAULT_CONTROL_BYTE },
};
EXPORT_SYMBOL(scst_op_descr_reserve10);
const struct scst_opcode_descriptor scst_op_descr_release10 = {
.od_opcode = RELEASE_10,
.od_support = 3, /* supported as in the standard */
.od_cdb_size = 10,
.od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC,
.od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ,
.od_cdb_usage_bits = { RELEASE_10, 0, 0, 0, 0, 0, 0, 0, 0,
SCST_OD_DEFAULT_CONTROL_BYTE },
};
EXPORT_SYMBOL(scst_op_descr_release10);
const struct scst_opcode_descriptor scst_op_descr_pr_in = {
.od_opcode = PERSISTENT_RESERVE_IN,
.od_support = 3, /* supported as in the standard */
.od_cdb_size = 10,
.od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC,
.od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ,
.od_cdb_usage_bits = { PERSISTENT_RESERVE_IN, 0x1F, 0, 0, 0, 0, 0, 0xFF, 0xFF,
SCST_OD_DEFAULT_CONTROL_BYTE },
};
EXPORT_SYMBOL(scst_op_descr_pr_in);
const struct scst_opcode_descriptor scst_op_descr_pr_out = {
.od_opcode = PERSISTENT_RESERVE_OUT,
.od_support = 3, /* supported as in the standard */
.od_cdb_size = 10,
.od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC,
.od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ,
.od_cdb_usage_bits = { PERSISTENT_RESERVE_OUT, 0x1F, 0xFF, 0, 0, 0xFF,
0xFF, 0xFF, 0xFF, SCST_OD_DEFAULT_CONTROL_BYTE },
};
EXPORT_SYMBOL(scst_op_descr_pr_out);
const struct scst_opcode_descriptor scst_op_descr_report_luns = {
.od_opcode = REPORT_LUNS,
.od_support = 3, /* supported as in the standard */
.od_cdb_size = 12,
.od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC,
.od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ,
.od_cdb_usage_bits = { REPORT_LUNS, 0, 0xFF, 0, 0, 0, 0xFF, 0xFF,
0xFF, 0xFF, 0, SCST_OD_DEFAULT_CONTROL_BYTE },
};
EXPORT_SYMBOL(scst_op_descr_report_luns);
const struct scst_opcode_descriptor scst_op_descr_request_sense = {
.od_opcode = REQUEST_SENSE,
.od_support = 3, /* supported as in the standard */
.od_cdb_size = 6,
.od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC,
.od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ,
.od_cdb_usage_bits = { REQUEST_SENSE, 1, 0, 0, 0xFF, SCST_OD_DEFAULT_CONTROL_BYTE },
};
EXPORT_SYMBOL(scst_op_descr_request_sense);
const struct scst_opcode_descriptor scst_op_descr_report_supp_tm_fns = {
.od_opcode = MAINTENANCE_IN,
.od_serv_action = MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS,
.od_serv_action_valid = 1,
.od_support = 3, /* supported as in the standard */
.od_cdb_size = 12,
.od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC,
.od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ,
.od_cdb_usage_bits = { MAINTENANCE_IN, MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS,
0x80, 0, 0, 0, 0xFF, 0xFF, 0xFF,
0xFF, 0, SCST_OD_DEFAULT_CONTROL_BYTE },
};
EXPORT_SYMBOL(scst_op_descr_report_supp_tm_fns);
const struct scst_opcode_descriptor scst_op_descr_report_supp_opcodes = {
.od_opcode = MAINTENANCE_IN,
.od_serv_action = MI_REPORT_SUPPORTED_OPERATION_CODES,
.od_serv_action_valid = 1,
.od_support = 3, /* supported as in the standard */
.od_cdb_size = 12,
.od_nominal_timeout = SCST_DEFAULT_NOMINAL_TIMEOUT_SEC,
.od_recommended_timeout = SCST_GENERIC_DISK_SMALL_TIMEOUT/HZ,
.od_cdb_usage_bits = { MAINTENANCE_IN, MI_REPORT_SUPPORTED_OPERATION_CODES,
0x87, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0, SCST_OD_DEFAULT_CONTROL_BYTE },
};
EXPORT_SYMBOL(scst_op_descr_report_supp_opcodes);
struct scst_sdbops;
static int get_cdb_info_len_10(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_block_limit(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_read_capacity(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_serv_act_in(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_single(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_read_pos(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_prevent_allow_medium_removal(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_start_stop(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_len_3_read_elem_stat(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_len_2(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_fmt(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_verify6(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_verify10(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_verify12(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_verify16(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_len_1(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_lba_3_len_1_256_read(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_lba_3_len_1_256_write(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_bidi_lba_4_len_2(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_len_3(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_len_4(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_none(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_lba_2_none(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_lba_4_len_2(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_read_10(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_lba_4_len_2_wrprotect(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_lba_4_none(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_lba_4_len_4_rdprotect(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_lba_4_len_4_wrprotect(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_read_16(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_lba_8_len_4_wrprotect(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_lba_8_none(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_write_same10(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_write_same16(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_compare_and_write(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_ext_copy(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_apt(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_min(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_mo(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
static int get_cdb_info_var_len(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops);
/*
* +=====================================-============-======-
* | Command name | Operation | Type |
* | | code | |
* |-------------------------------------+------------+------+
*
* +=========================================================+
* |Key: M = command implementation is mandatory. |
* | O = command implementation is optional. |
* | V = Vendor-specific |
* | R = Reserved |
* | ' '= DON'T use for this device |
* +=========================================================+
*/
#define SCST_CDB_MANDATORY 'M' /* mandatory */
#define SCST_CDB_OPTIONAL 'O' /* optional */
#define SCST_CDB_VENDOR 'V' /* vendor */
#define SCST_CDB_RESERVED 'R' /* reserved */
#define SCST_CDB_NOTSUPP ' ' /* don't use */
struct scst_sdbops {
uint8_t ops; /* SCSI-2 op codes */
uint8_t devkey[16]; /* Key for every device type M,O,V,R
* type_disk devkey[0]
* type_tape devkey[1]
* type_printer devkey[2]
* type_processor devkey[3]
* type_worm devkey[4]
* type_cdrom devkey[5]
* type_scanner devkey[6]
* type_mod devkey[7]
* type_changer devkey[8]
* type_commdev devkey[9]
* type_reserv devkey[A]
* type_reserv devkey[B]
* type_raid devkey[C]
* type_enclosure devkey[D]
* type_reserv devkey[E]
* type_reserv devkey[F]
*/
uint8_t info_lba_off; /* LBA offset in cdb */
uint8_t info_lba_len; /* LBA length in cdb */
uint8_t info_len_off; /* length offset in cdb */
uint8_t info_len_len; /* length length in cdb */
uint8_t info_data_direction;
/*
* init --> target: SCST_DATA_WRITE
* target --> init: SCST_DATA_READ
* target <--> init: SCST_DATA_READ|
* SCST_DATA_WRITE
*/
uint32_t info_op_flags; /* various flags of this opcode */
const char *info_op_name;/* op code SCSI full name */
int (*get_cdb_info)(struct scst_cmd *cmd, const struct scst_sdbops *sdbops);
};
static int scst_scsi_op_list[256];
#define FLAG_NONE 0
/* See also http://www.t10.org/lists/op-num.htm */
static const struct scst_sdbops scst_scsi_op_table[] = {
/*
* +-------------------> TYPE_DISK (0)
* |
* |+------------------> TYPE_TAPE (1)
* ||
* ||+-----------------> TYPE_PRINTER (2)
* |||
* |||+----------------> TYPE_PROCESSOR (3)
* ||||
* ||||+---------------> TYPE_WORM (4)
* |||||
* |||||+--------------> TYPE_CDROM (5)
* ||||||
* ||||||+-------------> TYPE_SCANNER (6)
* |||||||
* |||||||+------------> TYPE_MOD (7)
* ||||||||
* ||||||||+-----------> TYPE_CHANGER (8)
* |||||||||
* |||||||||+----------> TYPE_COMM (9)
* ||||||||||
* |||||||||| +-------> TYPE_RAID (C)
* |||||||||| |
* |||||||||| |+------> TYPE_ENCLOSURE (D)
* |||||||||| ||
* |||||||||| ||+-----> TYPE_RBC (E)
* |||||||||| |||
* |||||||||| |||+----> Optical card (F)
* |||||||||| ||||
* |||||||||| ||||
* 0123456789ABCDEF -> TYPE_????
*/
/* 6-bytes length CDB */
{.ops = 0x00, .devkey = "MMMMMMMMMMMMMMMM",
.info_op_name = "TEST UNIT READY",
.info_data_direction = SCST_DATA_NONE,
/* Let's be HQ to don't look dead under high load */
.info_op_flags = SCST_SMALL_TIMEOUT|SCST_IMPLICIT_HQ|
SCST_REG_RESERVE_ALLOWED|SCST_WRITE_EXCL_ALLOWED|
#ifdef CONFIG_SCST_TEST_IO_IN_SIRQ
SCST_TEST_IO_IN_SIRQ_ALLOWED|
#endif
SCST_EXCL_ACCESS_ALLOWED,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x01, .devkey = " M ",
.info_op_name = "REWIND",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_LONG_TIMEOUT|SCST_WRITE_EXCL_ALLOWED,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x03, .devkey = "MMMMMMMMMMMMMMMM",
.info_op_name = "REQUEST SENSE",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_SMALL_TIMEOUT|SCST_SKIP_UA|SCST_LOCAL_CMD|
SCST_REG_RESERVE_ALLOWED|SCST_WRITE_EXCL_ALLOWED|
SCST_EXCL_ACCESS_ALLOWED,
.info_len_off = 4, .info_len_len = 1,
.get_cdb_info = get_cdb_info_len_1},
{.ops = 0x04, .devkey = "M O O ",
.info_op_name = "FORMAT UNIT",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_LONG_TIMEOUT|SCST_WRITE_MEDIUM|SCST_STRICTLY_SERIALIZED,
.get_cdb_info = get_cdb_info_fmt},
{.ops = 0x04, .devkey = " O ",
.info_op_name = "FORMAT MEDIUM",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_LONG_TIMEOUT|SCST_WRITE_MEDIUM|SCST_STRICTLY_SERIALIZED,
.info_len_off = 3, .get_cdb_info = get_cdb_info_len_2},
{.ops = 0x04, .devkey = " O ",
.info_op_name = "FORMAT",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_WRITE_MEDIUM|SCST_STRICTLY_SERIALIZED,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x05, .devkey = "VMVVVV V ",
.info_op_name = "READ BLOCK LIMITS",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_SMALL_TIMEOUT|SCST_REG_RESERVE_ALLOWED|
SCST_WRITE_EXCL_ALLOWED|SCST_EXCL_ACCESS_ALLOWED,
.get_cdb_info = get_cdb_info_block_limit},
{.ops = 0x07, .devkey = " O ",
.info_op_name = "INITIALIZE ELEMENT STATUS",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_LONG_TIMEOUT,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x07, .devkey = "OVV O OV ",
.info_op_name = "REASSIGN BLOCKS",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_WRITE_MEDIUM,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x08, .devkey = "O ",
.info_op_name = "READ(6)",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|
#ifdef CONFIG_SCST_TEST_IO_IN_SIRQ
SCST_TEST_IO_IN_SIRQ_ALLOWED|
#endif
SCST_WRITE_EXCL_ALLOWED,
.info_lba_off = 1, .info_lba_len = 3,
.info_len_off = 4, .info_len_len = 1,
.get_cdb_info = get_cdb_info_lba_3_len_1_256_read},
{.ops = 0x08, .devkey = " MV O OV ",
.info_op_name = "READ(6)",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|
SCST_WRITE_EXCL_ALLOWED,
.info_len_off = 2, .info_len_len = 3,
.get_cdb_info = get_cdb_info_len_3},
{.ops = 0x08, .devkey = " M ",
.info_op_name = "GET MESSAGE(6)",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.info_len_off = 2, .info_len_len = 3,
.get_cdb_info = get_cdb_info_len_3},
{.ops = 0x08, .devkey = " O ",
.info_op_name = "RECEIVE",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.info_len_off = 2, .info_len_len = 3,
.get_cdb_info = get_cdb_info_len_3},
{.ops = 0x0A, .devkey = "O ",
.info_op_name = "WRITE(6)",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|
#ifdef CONFIG_SCST_TEST_IO_IN_SIRQ
SCST_TEST_IO_IN_SIRQ_ALLOWED|
#endif
SCST_WRITE_MEDIUM,
.info_lba_off = 1, .info_lba_len = 3,
.info_len_off = 4, .info_len_len = 1,
.get_cdb_info = get_cdb_info_lba_3_len_1_256_write},
{.ops = 0x0A, .devkey = " M O OV ",
.info_op_name = "WRITE(6)",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM,
.info_len_off = 2, .info_len_len = 3,
.get_cdb_info = get_cdb_info_len_3},
{.ops = 0x0A, .devkey = " M ",
.info_op_name = "PRINT",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = FLAG_NONE,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x0A, .devkey = " M ",
.info_op_name = "SEND MESSAGE(6)",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = FLAG_NONE,
.info_len_off = 2, .info_len_len = 3,
.get_cdb_info = get_cdb_info_len_3},
{.ops = 0x0A, .devkey = " M ",
.info_op_name = "SEND(6)",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = FLAG_NONE,
.info_len_off = 2, .info_len_len = 3,
.get_cdb_info = get_cdb_info_len_3},
{.ops = 0x0B, .devkey = "O OO OV ",
.info_op_name = "SEEK(6)",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = FLAG_NONE,
.info_lba_off = 2, .info_lba_len = 2,
.get_cdb_info = get_cdb_info_lba_2_none},
{.ops = 0x0B, .devkey = " O ",
.info_op_name = "SET CAPACITY",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_WRITE_MEDIUM|SCST_STRICTLY_SERIALIZED,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x0B, .devkey = " O ",
.info_op_name = "SLEW AND PRINT",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = FLAG_NONE,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x0C, .devkey = " VVVVV V ",
.info_op_name = "SEEK BLOCK",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_LONG_TIMEOUT,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x0D, .devkey = " VVVVV V ",
.info_op_name = "PARTITION",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_LONG_TIMEOUT|SCST_WRITE_MEDIUM,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x0F, .devkey = " OVVVV V ",
.info_op_name = "READ REVERSE",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|
SCST_WRITE_EXCL_ALLOWED,
.info_len_off = 12, .info_len_len = 3,
.get_cdb_info = get_cdb_info_len_3},
{.ops = 0x10, .devkey = " M V V ",
.info_op_name = "WRITE FILEMARKS(6)",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_WRITE_MEDIUM,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x10, .devkey = " O O ",
.info_op_name = "SYNCHRONIZE BUFFER",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = FLAG_NONE,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x11, .devkey = "VMVVVV ",
.info_op_name = "SPACE",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_LONG_TIMEOUT|
SCST_WRITE_EXCL_ALLOWED,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x12, .devkey = "MMMMMMMMMMMMMMMM",
.info_op_name = "INQUIRY",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_SMALL_TIMEOUT|SCST_IMPLICIT_HQ|SCST_SKIP_UA|
SCST_REG_RESERVE_ALLOWED|SCST_WRITE_EXCL_ALLOWED|
SCST_EXCL_ACCESS_ALLOWED,
.info_len_off = 3, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0x13, .devkey = " O ",
.info_op_name = "VERIFY(6)",
.info_data_direction = SCST_DATA_UNKNOWN,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_EXCL_ALLOWED,
.info_len_off = 2, .info_len_len = 3,
.get_cdb_info = get_cdb_info_verify6},
{.ops = 0x14, .devkey = " OOVVV ",
.info_op_name = "RECOVER BUFFERED DATA",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_EXCL_ALLOWED,
.info_len_off = 2, .info_len_len = 3,
.get_cdb_info = get_cdb_info_len_3},
{.ops = 0x15, .devkey = "OMOOOOOOOOOOOOOO",
.info_op_name = "MODE SELECT(6)",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_STRICTLY_SERIALIZED,
.info_len_off = 4, .info_len_len = 1,
.get_cdb_info = get_cdb_info_len_1},
{.ops = 0x16, .devkey = "MMMMMMMMMMMMMMMM",
.info_op_name = "RESERVE",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_SMALL_TIMEOUT|SCST_LOCAL_CMD|SCST_SERIALIZED|
SCST_WRITE_EXCL_ALLOWED|SCST_EXCL_ACCESS_ALLOWED|
SCST_SCSI_ATOMIC/* see comment in scst_cmd_overlap() */,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x17, .devkey = "MMMMMMMMMMMMMMMM",
.info_op_name = "RELEASE",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_SMALL_TIMEOUT|SCST_LOCAL_CMD|SCST_SERIALIZED|
SCST_REG_RESERVE_ALLOWED|SCST_WRITE_EXCL_ALLOWED|
SCST_EXCL_ACCESS_ALLOWED,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x19, .devkey = " MVVVV ",
.info_op_name = "ERASE",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_LONG_TIMEOUT|SCST_WRITE_MEDIUM,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x1A, .devkey = "OMOOOOOOOOOOOOOO",
.info_op_name = "MODE SENSE(6)",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_SMALL_TIMEOUT |
SCST_WRITE_EXCL_ALLOWED,
.info_len_off = 4, .info_len_len = 1,
.get_cdb_info = get_cdb_info_len_1},
{.ops = 0x1B, .devkey = " O ",
.info_op_name = "SCAN",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = FLAG_NONE,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x1B, .devkey = " O ",
.info_op_name = "LOAD UNLOAD",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_LONG_TIMEOUT,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x1B, .devkey = " O ",
.info_op_name = "STOP PRINT",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = FLAG_NONE,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x1B, .devkey = "O OO O O ",
.info_op_name = "START STOP UNIT",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_LONG_TIMEOUT,
.get_cdb_info = get_cdb_info_start_stop},
{.ops = 0x1C, .devkey = "OOOOOOOOOOOOOOOO",
.info_op_name = "RECEIVE DIAGNOSTIC RESULTS",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_WRITE_EXCL_ALLOWED,
.info_len_off = 3, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0x1D, .devkey = "MMMMMMMMMMMMMMMM",
.info_op_name = "SEND DIAGNOSTIC",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = FLAG_NONE,
.info_len_off = 3, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0x1E, .devkey = "OOOOOOOOOOOOOOOO",
.info_op_name = "PREVENT ALLOW MEDIUM REMOVAL",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_LONG_TIMEOUT,
.get_cdb_info = get_cdb_info_prevent_allow_medium_removal},
{.ops = 0x1F, .devkey = " O ",
.info_op_name = "PORT STATUS",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = FLAG_NONE,
.get_cdb_info = get_cdb_info_none},
/* 10-bytes length CDB */
{.ops = 0x23, .devkey = "V VV V ",
.info_op_name = "READ FORMAT CAPACITY",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0x24, .devkey = " VVM ",
.info_op_name = "SET WINDOW",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = FLAG_NONE,
.info_len_off = 6, .info_len_len = 3,
.get_cdb_info = get_cdb_info_len_3},
{.ops = 0x25, .devkey = "M MM M ",
.info_op_name = "READ CAPACITY",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_IMPLICIT_HQ|SCST_REG_RESERVE_ALLOWED|
SCST_WRITE_EXCL_ALLOWED|SCST_EXCL_ACCESS_ALLOWED,
.get_cdb_info = get_cdb_info_read_capacity},
{.ops = 0x25, .devkey = " O ",
.info_op_name = "GET WINDOW",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.info_len_off = 6, .info_len_len = 3,
.get_cdb_info = get_cdb_info_len_3},
{.ops = 0x28, .devkey = "M MMMM ",
.info_op_name = "READ(10)",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|
#ifdef CONFIG_SCST_TEST_IO_IN_SIRQ
SCST_TEST_IO_IN_SIRQ_ALLOWED|
#endif
SCST_WRITE_EXCL_ALLOWED,
.info_lba_off = 2, .info_lba_len = 4,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_read_10},
{.ops = 0x28, .devkey = " O ",
.info_op_name = "GET MESSAGE(10)",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0x29, .devkey = "V VV O ",
.info_op_name = "READ GENERATION",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.info_len_off = 8, .info_len_len = 1,
.get_cdb_info = get_cdb_info_len_1},
{.ops = 0x2A, .devkey = "O MO M ",
.info_op_name = "WRITE(10)",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|
#ifdef CONFIG_SCST_TEST_IO_IN_SIRQ
SCST_TEST_IO_IN_SIRQ_ALLOWED|
#endif
SCST_WRITE_MEDIUM,
.info_lba_off = 2, .info_lba_len = 4,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_lba_4_len_2_wrprotect},
{.ops = 0x2A, .devkey = " O ",
.info_op_name = "SEND MESSAGE(10)",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = FLAG_NONE,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0x2A, .devkey = " O ",
.info_op_name = "SEND(10)",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = FLAG_NONE,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0x2B, .devkey = " O ",
.info_op_name = "LOCATE",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_LONG_TIMEOUT|SCST_WRITE_EXCL_ALLOWED,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x2B, .devkey = " O ",
.info_op_name = "POSITION TO ELEMENT",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_LONG_TIMEOUT,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x2B, .devkey = "O OO O ",
.info_op_name = "SEEK(10)",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = FLAG_NONE,
.info_lba_off = 2, .info_lba_len = 4,
.get_cdb_info = get_cdb_info_lba_4_none},
{.ops = 0x2C, .devkey = "V O O ",
.info_op_name = "ERASE(10)",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_LONG_TIMEOUT|SCST_WRITE_MEDIUM,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x2D, .devkey = "V O O ",
.info_op_name = "READ UPDATED BLOCK",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED,
.get_cdb_info = get_cdb_info_single},
{.ops = 0x2E, .devkey = "O OO O ",
.info_op_name = "WRITE AND VERIFY(10)",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM,
.info_lba_off = 2, .info_lba_len = 4,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_lba_4_len_2_wrprotect},
{.ops = 0x2F, .devkey = "O OO O ",
.info_op_name = "VERIFY(10)",
.info_data_direction = SCST_DATA_UNKNOWN,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_EXCL_ALLOWED,
.info_lba_off = 2, .info_lba_len = 4,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_verify10},
{.ops = 0x33, .devkey = " OO O ",
.info_op_name = "SET LIMITS(10)",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = FLAG_NONE,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x34, .devkey = " O ",
.info_op_name = "READ POSITION",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_SMALL_TIMEOUT|SCST_WRITE_EXCL_ALLOWED,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_read_pos},
{.ops = 0x34, .devkey = " O ",
.info_op_name = "GET DATA BUFFER STATUS",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0x34, .devkey = "O OO O ",
.info_op_name = "PRE-FETCH",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_WRITE_EXCL_ALLOWED,
.info_lba_off = 2, .info_lba_len = 4,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_lba_4_none},
{.ops = 0x35, .devkey = "O OO O ",
.info_op_name = "SYNCHRONIZE CACHE(10)",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = FLAG_NONE,
.info_lba_off = 2, .info_lba_len = 4,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_lba_4_none},
{.ops = 0x36, .devkey = "O OO O ",
.info_op_name = "LOCK UNLOCK CACHE",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_WRITE_EXCL_ALLOWED,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x37, .devkey = "O O ",
.info_op_name = "READ DEFECT DATA(10)",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_WRITE_EXCL_ALLOWED,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0x37, .devkey = " O ",
.info_op_name = "INIT ELEMENT STATUS WRANGE",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_LONG_TIMEOUT,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x38, .devkey = " O O ",
.info_op_name = "MEDIUM SCAN",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.info_len_off = 8, .info_len_len = 1,
.get_cdb_info = get_cdb_info_len_1},
{.ops = 0x3B, .devkey = "OOOOOOOOOOOOOOOO",
.info_op_name = "WRITE BUFFER",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_SMALL_TIMEOUT,
.info_len_off = 6, .info_len_len = 3,
.get_cdb_info = get_cdb_info_len_3},
{.ops = 0x3C, .devkey = "OOOOOOOOOOOOOOOO",
.info_op_name = "READ BUFFER",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_SMALL_TIMEOUT |
SCST_WRITE_EXCL_ALLOWED,
.info_len_off = 6, .info_len_len = 3,
.get_cdb_info = get_cdb_info_len_3},
{.ops = 0x3D, .devkey = " O O ",
.info_op_name = "UPDATE BLOCK",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED,
.get_cdb_info = get_cdb_info_single},
{.ops = 0x3E, .devkey = "O OO O ",
.info_op_name = "READ LONG",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.info_lba_off = 2, .info_lba_len = 4,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_lba_4_len_2},
{.ops = 0x3F, .devkey = "O O O ",
.info_op_name = "WRITE LONG",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_WRITE_MEDIUM,
.info_lba_off = 2, .info_lba_len = 4,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_lba_4_len_2},
{.ops = 0x40, .devkey = "OOOOOOOOOO ",
.info_op_name = "CHANGE DEFINITION",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_SMALL_TIMEOUT,
.info_len_off = 8, .info_len_len = 1,
.get_cdb_info = get_cdb_info_len_1},
{.ops = 0x41, .devkey = "O ",
.info_op_name = "WRITE SAME(10)",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM,
.info_lba_off = 2, .info_lba_len = 4,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_write_same10},
{.ops = 0x42, .devkey = " O ",
.info_op_name = "READ SUB-CHANNEL",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0x42, .devkey = "O ",
.info_op_name = "UNMAP",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_WRITE_MEDIUM|SCST_DESCRIPTORS_BASED,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0x43, .devkey = " O ",
.info_op_name = "READ TOC/PMA/ATIP",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0x44, .devkey = " M ",
.info_op_name = "REPORT DENSITY SUPPORT",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_REG_RESERVE_ALLOWED|SCST_WRITE_EXCL_ALLOWED|
SCST_EXCL_ACCESS_ALLOWED,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0x44, .devkey = " O ",
.info_op_name = "READ HEADER",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0x45, .devkey = " O ",
.info_op_name = "PLAY AUDIO(10)",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = FLAG_NONE,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x46, .devkey = " O ",
.info_op_name = "GET CONFIGURATION",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0x47, .devkey = " O ",
.info_op_name = "PLAY AUDIO MSF",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = FLAG_NONE,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x48, .devkey = " O ",
.info_op_name = "PLAY AUDIO TRACK INDEX",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = FLAG_NONE,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x49, .devkey = " O ",
.info_op_name = "PLAY TRACK RELATIVE(10)",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = FLAG_NONE,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x4A, .devkey = " O ",
.info_op_name = "GET EVENT STATUS NOTIFICATION",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0x4B, .devkey = " O ",
.info_op_name = "PAUSE/RESUME",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = FLAG_NONE,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x4C, .devkey = "OOOOOOOOOOOOOOOO",
.info_op_name = "LOG SELECT",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_STRICTLY_SERIALIZED,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0x4D, .devkey = "OOOOOOOOOOOOOOOO",
.info_op_name = "LOG SENSE",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_SMALL_TIMEOUT|SCST_REG_RESERVE_ALLOWED|
SCST_WRITE_EXCL_ALLOWED|SCST_EXCL_ACCESS_ALLOWED,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0x4E, .devkey = " O ",
.info_op_name = "STOP PLAY/SCAN",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = FLAG_NONE,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x50, .devkey = "O ",
.info_op_name = "XDWRITE(10)",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_WRITE_MEDIUM,
.info_lba_off = 2, .info_lba_len = 4,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_lba_4_len_2_wrprotect},
{.ops = 0x51, .devkey = " O ",
.info_op_name = "READ DISC INFORMATION",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0x51, .devkey = "O ",
.info_op_name = "XPWRITE",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_WRITE_MEDIUM,
.info_lba_off = 2, .info_lba_len = 4,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_lba_4_len_2},
{.ops = 0x52, .devkey = " O ",
.info_op_name = "READ TRACK INFORMATION",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0x53, .devkey = "O ",
.info_op_name = "XDWRITEREAD(10)",
.info_data_direction = SCST_DATA_BIDI,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM,
.info_lba_off = 2, .info_lba_len = 4,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_bidi_lba_4_len_2},
{.ops = 0x53, .devkey = " O ",
.info_op_name = "RESERVE TRACK",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = FLAG_NONE,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x54, .devkey = " O ",
.info_op_name = "SEND OPC INFORMATION",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = FLAG_NONE,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0x55, .devkey = "OOOOOOOOOOOOOOOO",
.info_op_name = "MODE SELECT(10)",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_STRICTLY_SERIALIZED,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0x56, .devkey = "OOOOOOOOOOOOOOOO",
.info_op_name = "RESERVE(10)",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_SMALL_TIMEOUT|SCST_LOCAL_CMD|SCST_SERIALIZED|
SCST_WRITE_EXCL_ALLOWED|SCST_EXCL_ACCESS_ALLOWED|
SCST_SCSI_ATOMIC/* see comment in scst_cmd_overlap() */,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x57, .devkey = "OOOOOOOOOOOOOOOO",
.info_op_name = "RELEASE(10)",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_SMALL_TIMEOUT|SCST_LOCAL_CMD|SCST_SERIALIZED|
SCST_REG_RESERVE_ALLOWED|SCST_WRITE_EXCL_ALLOWED|
SCST_EXCL_ACCESS_ALLOWED,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x58, .devkey = " O ",
.info_op_name = "REPAIR TRACK",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_WRITE_MEDIUM,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x5A, .devkey = "OOOOOOOOOOOOOOOO",
.info_op_name = "MODE SENSE(10)",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_SMALL_TIMEOUT |
SCST_WRITE_EXCL_ALLOWED,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0x5B, .devkey = " O ",
.info_op_name = "CLOSE TRACK/SESSION",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = FLAG_NONE,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x5C, .devkey = " O ",
.info_op_name = "READ BUFFER CAPACITY",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.info_len_off = 7, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0x5D, .devkey = " O ",
.info_op_name = "SEND CUE SHEET",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = FLAG_NONE,
.info_len_off = 6, .info_len_len = 3,
.get_cdb_info = get_cdb_info_len_3},
{.ops = 0x5E, .devkey = "OOOOO OOOO ",
.info_op_name = "PERSISTENT RESERVE IN",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_SMALL_TIMEOUT|SCST_LOCAL_CMD|SCST_SERIALIZED|
SCST_WRITE_EXCL_ALLOWED|SCST_EXCL_ACCESS_ALLOWED,
.info_len_off = 5, .info_len_len = 4,
.get_cdb_info = get_cdb_info_len_4},
{.ops = 0x5F, .devkey = "OOOOO OOOO ",
.info_op_name = "PERSISTENT RESERVE OUT",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_SMALL_TIMEOUT|SCST_LOCAL_CMD|SCST_SERIALIZED|
SCST_WRITE_EXCL_ALLOWED|SCST_EXCL_ACCESS_ALLOWED,
.info_len_off = 5, .info_len_len = 4,
.get_cdb_info = get_cdb_info_len_4},
/* Variable length CDBs */
{.ops = 0x7F, .devkey = "O ",
.info_op_name = "VAR LEN CDB",
.info_data_direction = SCST_DATA_UNKNOWN,
.info_op_flags = 0,
.get_cdb_info = get_cdb_info_var_len},
/* 16-bytes length CDB */
{.ops = 0x80, .devkey = " O ",
.info_op_name = "WRITE FILEMARKS(16)",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_WRITE_MEDIUM,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x81, .devkey = "O OO O ",
.info_op_name = "REBUILD",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_WRITE_MEDIUM,
.info_len_off = 10, .info_len_len = 4,
.get_cdb_info = get_cdb_info_len_4},
{.ops = 0x82, .devkey = "O OO O ",
.info_op_name = "REGENERATE",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_WRITE_MEDIUM,
.info_len_off = 10, .info_len_len = 4,
.get_cdb_info = get_cdb_info_len_4},
{.ops = 0x83, .devkey = "O ", /* implemented only for disks */
.info_op_name = "EXTENDED COPY",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_WRITE_MEDIUM|SCST_CAN_GEN_3PARTY_COMMANDS|
SCST_LOCAL_CMD|SCST_DESCRIPTORS_BASED,
.info_len_off = 10, .info_len_len = 4,
.get_cdb_info = get_cdb_info_ext_copy},
{.ops = 0x84, .devkey = "O ", /* implemented only for disks */
.info_op_name = "RECEIVE COPY RESULT",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_LOCAL_CMD|SCST_WRITE_EXCL_ALLOWED|SCST_EXCL_ACCESS_ALLOWED,
.info_len_off = 10, .info_len_len = 4,
.get_cdb_info = get_cdb_info_len_4},
{.ops = 0x85, .devkey = "O O O ",
.info_op_name = "ATA PASS-THROUGH(16)",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = FLAG_NONE,
.info_lba_off = 7, .info_lba_len = 6,
.get_cdb_info = get_cdb_info_apt},
{.ops = 0x86, .devkey = "OOOOOOOOOO ",
.info_op_name = "ACCESS CONTROL IN",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_REG_RESERVE_ALLOWED|SCST_WRITE_EXCL_ALLOWED|
SCST_EXCL_ACCESS_ALLOWED,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x87, .devkey = "OOOOOOOOOO ",
.info_op_name = "ACCESS CONTROL OUT",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_REG_RESERVE_ALLOWED|SCST_WRITE_EXCL_ALLOWED|
SCST_EXCL_ACCESS_ALLOWED,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x88, .devkey = "M MMMM ",
.info_op_name = "READ(16)",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|
#ifdef CONFIG_SCST_TEST_IO_IN_SIRQ
SCST_TEST_IO_IN_SIRQ_ALLOWED|
#endif
SCST_WRITE_EXCL_ALLOWED,
.info_lba_off = 2, .info_lba_len = 8,
.info_len_off = 10, .info_len_len = 4,
.get_cdb_info = get_cdb_info_read_16},
{.ops = 0x89, .devkey = "O ",
.info_op_name = "COMPARE AND WRITE",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|
SCST_LOCAL_CMD|
SCST_WRITE_MEDIUM|SCST_SCSI_ATOMIC,
.info_lba_off = 2, .info_lba_len = 8,
.info_len_off = 13, .info_len_len = 1,
.get_cdb_info = get_cdb_info_compare_and_write},
{.ops = 0x8A, .devkey = "O OO O ",
.info_op_name = "WRITE(16)",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|
#ifdef CONFIG_SCST_TEST_IO_IN_SIRQ
SCST_TEST_IO_IN_SIRQ_ALLOWED|
#endif
SCST_WRITE_MEDIUM,
.info_lba_off = 2, .info_lba_len = 8,
.info_len_off = 10, .info_len_len = 4,
.get_cdb_info = get_cdb_info_lba_8_len_4_wrprotect},
{.ops = 0x8C, .devkey = " OOOOOOOOO ",
.info_op_name = "READ ATTRIBUTE",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_WRITE_EXCL_ALLOWED,
.info_len_off = 10, .info_len_len = 4,
.get_cdb_info = get_cdb_info_len_4},
{.ops = 0x8D, .devkey = " OOOOOOOOO ",
.info_op_name = "WRITE ATTRIBUTE",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_WRITE_MEDIUM,
.info_len_off = 10, .info_len_len = 4,
.get_cdb_info = get_cdb_info_len_4},
{.ops = 0x8E, .devkey = "O OO O ",
.info_op_name = "WRITE AND VERIFY(16)",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM,
.info_lba_off = 2, .info_lba_len = 8,
.info_len_off = 10, .info_len_len = 4,
.get_cdb_info = get_cdb_info_lba_8_len_4_wrprotect},
{.ops = 0x8F, .devkey = "O OO O ",
.info_op_name = "VERIFY(16)",
.info_data_direction = SCST_DATA_UNKNOWN,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_EXCL_ALLOWED,
.info_lba_off = 2, .info_lba_len = 8,
.info_len_off = 10, .info_len_len = 4,
.get_cdb_info = get_cdb_info_verify16},
{.ops = 0x90, .devkey = "O OO O ",
.info_op_name = "PRE-FETCH(16)",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_WRITE_EXCL_ALLOWED,
.info_lba_off = 2, .info_lba_len = 8,
.get_cdb_info = get_cdb_info_lba_8_none},
{.ops = 0x91, .devkey = "O OO O ",
.info_op_name = "SYNCHRONIZE CACHE(16)",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = FLAG_NONE,
.info_lba_off = 2, .info_lba_len = 8,
.info_len_off = 10, .info_len_len = 4,
.get_cdb_info = get_cdb_info_lba_8_none},
{.ops = 0x91, .devkey = " M ",
.info_op_name = "SPACE(16)",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_LONG_TIMEOUT|SCST_WRITE_EXCL_ALLOWED,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x92, .devkey = "O OO O ",
.info_op_name = "LOCK UNLOCK CACHE(16)",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = FLAG_NONE,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x92, .devkey = " O ",
.info_op_name = "LOCATE(16)",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_LONG_TIMEOUT|SCST_WRITE_EXCL_ALLOWED,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x93, .devkey = "O ",
.info_op_name = "WRITE SAME(16)",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM,
.info_lba_off = 2, .info_lba_len = 8,
.info_len_off = 10, .info_len_len = 4,
.get_cdb_info = get_cdb_info_write_same16},
{.ops = 0x93, .devkey = " M ",
.info_op_name = "ERASE(16)",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_LONG_TIMEOUT|SCST_WRITE_MEDIUM,
.get_cdb_info = get_cdb_info_none},
{.ops = 0x9E, .devkey = "O ",
.info_op_name = "SERVICE ACTION IN",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.get_cdb_info = get_cdb_info_serv_act_in},
/* 12-bytes length CDB */
{.ops = 0xA0, .devkey = "VVVVVVVVVV M ",
.info_op_name = "REPORT LUNS",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_SMALL_TIMEOUT|SCST_IMPLICIT_HQ|SCST_SKIP_UA|
SCST_FULLY_LOCAL_CMD|SCST_LOCAL_CMD|
SCST_REG_RESERVE_ALLOWED|
SCST_WRITE_EXCL_ALLOWED|SCST_EXCL_ACCESS_ALLOWED,
.info_len_off = 6, .info_len_len = 4,
.get_cdb_info = get_cdb_info_len_4},
{.ops = 0xA1, .devkey = "O O O ",
.info_op_name = "ATA PASS-THROUGH(12)",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = FLAG_NONE,
.info_lba_off = 5, .info_lba_len = 3,
.get_cdb_info = get_cdb_info_apt},
{.ops = 0xA1, .devkey = " O ",
.info_op_name = "BLANK",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_LONG_TIMEOUT,
.get_cdb_info = get_cdb_info_none},
{.ops = 0xA2, .devkey = "OO O ",
.info_op_name = "SECURITY PROTOCOL IN",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_REG_RESERVE_ALLOWED|SCST_WRITE_EXCL_ALLOWED,
.info_len_off = 6, .info_len_len = 4,
.get_cdb_info = get_cdb_info_len_4},
{.ops = 0xA3, .devkey = " O ",
.info_op_name = "SEND KEY",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = FLAG_NONE,
.info_len_off = 8, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0xA3, .devkey = "OOO O OOOO MO O",
.info_op_name = "MAINTENANCE(IN)",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.info_len_off = 6, .info_len_len = 4,
.get_cdb_info = get_cdb_info_min},
{.ops = 0xA4, .devkey = " O ",
.info_op_name = "REPORT KEY",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.info_len_off = 8, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0xA4, .devkey = "OOO O OOOO MO O",
.info_op_name = "MAINTENANCE(OUT)",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = FLAG_NONE,
.info_len_off = 6, .info_len_len = 4,
.get_cdb_info = get_cdb_info_mo},
{.ops = 0xA5, .devkey = " M ",
.info_op_name = "MOVE MEDIUM",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_LONG_TIMEOUT,
.get_cdb_info = get_cdb_info_none},
{.ops = 0xA5, .devkey = " O ",
.info_op_name = "PLAY AUDIO(12)",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = FLAG_NONE,
.get_cdb_info = get_cdb_info_none},
{.ops = 0xA6, .devkey = " O O ",
.info_op_name = "EXCHANGE/LOAD/UNLOAD MEDIUM",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_LONG_TIMEOUT,
.get_cdb_info = get_cdb_info_none},
{.ops = 0xA7, .devkey = " O ",
.info_op_name = "SET READ AHEAD",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = FLAG_NONE,
.get_cdb_info = get_cdb_info_none},
{.ops = 0xA8, .devkey = " O ",
.info_op_name = "GET MESSAGE(12)",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.info_len_off = 6, .info_len_len = 4,
.get_cdb_info = get_cdb_info_len_4},
{.ops = 0xA8, .devkey = "O OO O ",
.info_op_name = "READ(12)",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|
#ifdef CONFIG_SCST_TEST_IO_IN_SIRQ
SCST_TEST_IO_IN_SIRQ_ALLOWED|
#endif
SCST_WRITE_EXCL_ALLOWED,
.info_lba_off = 2, .info_lba_len = 4,
.info_len_off = 6, .info_len_len = 4,
.get_cdb_info = get_cdb_info_lba_4_len_4_rdprotect},
{.ops = 0xA9, .devkey = " O ",
.info_op_name = "PLAY TRACK RELATIVE(12)",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = FLAG_NONE,
.get_cdb_info = get_cdb_info_none},
{.ops = 0xAA, .devkey = "O OO O ",
.info_op_name = "WRITE(12)",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|
#ifdef CONFIG_SCST_TEST_IO_IN_SIRQ
SCST_TEST_IO_IN_SIRQ_ALLOWED|
#endif
SCST_WRITE_MEDIUM,
.info_lba_off = 2, .info_lba_len = 4,
.info_len_off = 6, .info_len_len = 4,
.get_cdb_info = get_cdb_info_lba_4_len_4_wrprotect},
{.ops = 0xAA, .devkey = " O ",
.info_op_name = "SEND MESSAGE(12)",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = FLAG_NONE,
.info_len_off = 6, .info_len_len = 4,
.get_cdb_info = get_cdb_info_len_4},
{.ops = 0xAC, .devkey = " O ",
.info_op_name = "ERASE(12)",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_WRITE_MEDIUM,
.get_cdb_info = get_cdb_info_none},
{.ops = 0xAC, .devkey = " M ",
.info_op_name = "GET PERFORMANCE",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_UNKNOWN_LENGTH,
.get_cdb_info = get_cdb_info_none},
{.ops = 0xAD, .devkey = " O ",
.info_op_name = "READ DVD STRUCTURE",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.info_len_off = 8, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0xAE, .devkey = "O OO O ",
.info_op_name = "WRITE AND VERIFY(12)",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM,
.info_lba_off = 2, .info_lba_len = 4,
.info_len_off = 6, .info_len_len = 4,
.get_cdb_info = get_cdb_info_lba_4_len_4_wrprotect},
{.ops = 0xAF, .devkey = "O OO O ",
.info_op_name = "VERIFY(12)",
.info_data_direction = SCST_DATA_UNKNOWN,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_EXCL_ALLOWED,
.info_lba_off = 2, .info_lba_len = 4,
.info_len_off = 6, .info_len_len = 4,
.get_cdb_info = get_cdb_info_verify12},
{.ops = 0xB3, .devkey = " OO O ",
.info_op_name = "SET LIMITS(12)",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = FLAG_NONE,
.get_cdb_info = get_cdb_info_none},
{.ops = 0xB5, .devkey = "OO O ",
.info_op_name = "SECURITY PROTOCOL OUT",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = FLAG_NONE,
.info_len_off = 6, .info_len_len = 4,
.get_cdb_info = get_cdb_info_len_4},
{.ops = 0xB5, .devkey = " O ",
.info_op_name = "REQUEST VOLUME ELEMENT ADDRESS",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.info_len_off = 7, .info_len_len = 3,
.get_cdb_info = get_cdb_info_len_3},
{.ops = 0xB6, .devkey = " O ",
.info_op_name = "SEND VOLUME TAG",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = FLAG_NONE,
.info_len_off = 9, .info_len_len = 1,
.get_cdb_info = get_cdb_info_len_1},
{.ops = 0xB6, .devkey = " M ",
.info_op_name = "SET STREAMING",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = FLAG_NONE,
.info_len_off = 9, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0xB7, .devkey = "O O ",
.info_op_name = "READ DEFECT DATA(12)",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_WRITE_EXCL_ALLOWED,
.info_len_off = 9, .info_len_len = 1,
.get_cdb_info = get_cdb_info_len_1},
{.ops = 0xB8, .devkey = " O ",
.info_op_name = "READ ELEMENT STATUS",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.info_len_off = 7, .info_len_len = 3,
.get_cdb_info = get_cdb_info_len_3_read_elem_stat},
{.ops = 0xB9, .devkey = " O ",
.info_op_name = "READ CD MSF",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_UNKNOWN_LENGTH,
.get_cdb_info = get_cdb_info_none},
{.ops = 0xBA, .devkey = " O ",
.info_op_name = "SCAN",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_LONG_TIMEOUT,
.get_cdb_info = get_cdb_info_none},
{.ops = 0xBA, .devkey = " O ",
.info_op_name = "REDUNDANCY GROUP(IN)",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.info_len_off = 6, .info_len_len = 4,
.get_cdb_info = get_cdb_info_len_4},
{.ops = 0xBB, .devkey = " O ",
.info_op_name = "SET SPEED",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = FLAG_NONE,
.get_cdb_info = get_cdb_info_none},
{.ops = 0xBB, .devkey = " O ",
.info_op_name = "REDUNDANCY GROUP(OUT)",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = FLAG_NONE,
.info_len_off = 6, .info_len_len = 4,
.get_cdb_info = get_cdb_info_len_4},
{.ops = 0xBC, .devkey = " O ",
.info_op_name = "SPARE(IN)",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.info_len_off = 6, .info_len_len = 4,
.get_cdb_info = get_cdb_info_len_4},
{.ops = 0xBD, .devkey = " O ",
.info_op_name = "MECHANISM STATUS",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.info_len_off = 8, .info_len_len = 2,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0xBD, .devkey = " O ",
.info_op_name = "SPARE(OUT)",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = FLAG_NONE,
.info_len_off = 6, .info_len_len = 4,
.get_cdb_info = get_cdb_info_len_4},
{.ops = 0xBE, .devkey = " O ",
.info_op_name = "READ CD",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED,
.info_len_off = 6, .info_len_len = 3,
.get_cdb_info = get_cdb_info_len_3},
{.ops = 0xBE, .devkey = " O ",
.info_op_name = "VOLUME SET(IN)",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = FLAG_NONE,
.info_len_off = 6, .info_len_len = 4,
.get_cdb_info = get_cdb_info_len_4},
{.ops = 0xBF, .devkey = " O ",
.info_op_name = "SEND DVD STRUCTUE",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = FLAG_NONE,
.info_len_off = 8, .info_len_len = 4,
.get_cdb_info = get_cdb_info_len_2},
{.ops = 0xBF, .devkey = " O ",
.info_op_name = "VOLUME SET(OUT)",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = FLAG_NONE,
.info_len_off = 6, .info_len_len = 4,
.get_cdb_info = get_cdb_info_len_4},
{.ops = 0xE7, .devkey = " V ",
.info_op_name = "INIT ELEMENT STATUS WRANGE",
.info_data_direction = SCST_DATA_NONE,
.info_op_flags = SCST_LONG_TIMEOUT,
.get_cdb_info = get_cdb_info_len_10}
};
#define SCST_CDB_TBL_SIZE (ARRAY_SIZE(scst_scsi_op_table))
static void scst_del_tgt_dev(struct scst_tgt_dev *tgt_dev);
static void scst_free_tgt_dev(struct scst_tgt_dev *tgt_dev);
static void scst_check_internal_sense(struct scst_device *dev, int result,
uint8_t *sense, int sense_len);
static void scst_queue_report_luns_changed_UA(struct scst_session *sess,
int flags);
static void __scst_check_set_UA(struct scst_tgt_dev *tgt_dev,
const uint8_t *sense, int sense_len, int flags);
static void scst_alloc_set_UA(struct scst_tgt_dev *tgt_dev,
const uint8_t *sense, int sense_len, int flags);
static void scst_free_all_UA(struct scst_tgt_dev *tgt_dev);
static void scst_release_space(struct scst_cmd *cmd);
static void scst_clear_reservation(struct scst_tgt_dev *tgt_dev);
static int scst_alloc_add_tgt_dev(struct scst_session *sess,
struct scst_acg_dev *acg_dev, struct scst_tgt_dev **out_tgt_dev);
static void scst_tgt_retry_timer_fn(struct timer_list *timer);
#ifdef CONFIG_SCST_DEBUG_TM
static void tm_dbg_init_tgt_dev(struct scst_tgt_dev *tgt_dev);
static void tm_dbg_deinit_tgt_dev(struct scst_tgt_dev *tgt_dev);
#else
static inline void tm_dbg_init_tgt_dev(struct scst_tgt_dev *tgt_dev) {}
static inline void tm_dbg_deinit_tgt_dev(struct scst_tgt_dev *tgt_dev) {}
#endif /* CONFIG_SCST_DEBUG_TM */
/*
* scst_alloc_sense() - allocate sense buffer for command
*
* Allocates, if necessary, sense buffer for command. Returns 0 on success
* and error code otherwise. Parameter "atomic" should be non-0 if the
* function called in atomic context.
*/
int scst_alloc_sense(struct scst_cmd *cmd, int atomic)
{
int res = 0;
gfp_t gfp_mask = atomic ? GFP_ATOMIC : (cmd->cmd_gfp_mask|__GFP_NOFAIL);
TRACE_ENTRY();
if (cmd->sense != NULL)
goto memzero;
cmd->sense = mempool_alloc(scst_sense_mempool, gfp_mask);
if (cmd->sense == NULL) {
PRINT_CRIT_ERROR("Sense memory allocation failed (op %s). "
"The sense data will be lost!!", scst_get_opcode_name(cmd));
res = -ENOMEM;
goto out;
}
cmd->sense_buflen = SCST_SENSE_BUFFERSIZE;
memzero:
cmd->sense_valid_len = 0;
memset(cmd->sense, 0, cmd->sense_buflen);
out:
TRACE_EXIT_RES(res);
return res;
}
EXPORT_SYMBOL(scst_alloc_sense);
/*
* scst_alloc_set_sense() - allocate and fill sense buffer for command
*
* Allocates, if necessary, sense buffer for command and copies in
* it data from the supplied sense buffer. Returns 0 on success
* and error code otherwise.
*/
int scst_alloc_set_sense(struct scst_cmd *cmd, int atomic,
const uint8_t *sense, unsigned int len)
{
int res;
TRACE_ENTRY();
/*
* We don't check here if the existing sense is valid or not, because
* we suppose the caller did it based on cmd->status.
*/
res = scst_alloc_sense(cmd, atomic);
if (res != 0) {
PRINT_BUFFER("Lost sense", sense, len);
goto out;
}
cmd->sense_valid_len = len;
if (cmd->sense_buflen < len) {
PRINT_WARNING("Sense truncated (needed %d), shall you increase "
"SCST_SENSE_BUFFERSIZE? Op: %s", len,
scst_get_opcode_name(cmd));
cmd->sense_valid_len = cmd->sense_buflen;
}
memcpy(cmd->sense, sense, cmd->sense_valid_len);
TRACE_BUFFER("Sense set", cmd->sense, cmd->sense_valid_len);
out:
TRACE_EXIT_RES(res);
return res;
}
EXPORT_SYMBOL(scst_alloc_set_sense);
/**
* scst_set_cmd_error_status() - set error SCSI status
* @cmd: SCST command
* @status: SCSI status to set
*
* Description:
* Sets error SCSI status in the command and prepares it for returning it.
* Returns 0 on success, error code otherwise.
*/
int scst_set_cmd_error_status(struct scst_cmd *cmd, int status)
{
int res = 0;
TRACE_ENTRY();
if (status == SAM_STAT_RESERVATION_CONFLICT) {
TRACE(TRACE_SCSI|TRACE_MINOR, "Reservation conflict (dev %s, "
"initiator %s, tgt_id %d)",
cmd->dev ? cmd->dev->virt_name : NULL,
cmd->sess->initiator_name, cmd->tgt->rel_tgt_id);
}
if (cmd->status != 0) {
TRACE_MGMT_DBG("cmd %p already has status %x set", cmd,
cmd->status);
res = -EEXIST;
goto out;
}
cmd->status = status;
cmd->host_status = DID_OK;
cmd->dbl_ua_orig_resp_data_len = cmd->resp_data_len;
cmd->dbl_ua_orig_data_direction = cmd->data_direction;
cmd->data_direction = SCST_DATA_NONE;
cmd->resp_data_len = 0;
cmd->resid_possible = 1;
cmd->is_send_status = 1;
cmd->completed = 1;
out:
TRACE_EXIT_RES(res);
return res;
}
EXPORT_SYMBOL(scst_set_cmd_error_status);
static int scst_set_lun_not_supported_request_sense(struct scst_cmd *cmd,
int key, int asc, int ascq)
{
int res;
int sense_len, len;
struct scatterlist *sg;
TRACE_ENTRY();
if (cmd->status != 0) {
TRACE_MGMT_DBG("cmd %p already has status %x set", cmd,
cmd->status);
res = -EEXIST;
goto out;
}
if ((cmd->sg != NULL) && scst_sense_valid(sg_virt(cmd->sg))) {
TRACE_MGMT_DBG("cmd %p already has sense set", cmd);
res = -EEXIST;
goto out;
}
if (cmd->sg == NULL) {
/*
* If target driver preparing data buffer using tgt_alloc_data_buf()
* callback, it is responsible to copy the sense to its buffer
* in xmit_response().
*/
if (cmd->tgt_i_data_buf_alloced && (cmd->tgt_i_sg != NULL)) {
cmd->sg = cmd->tgt_i_sg;
cmd->sg_cnt = cmd->tgt_i_sg_cnt;
TRACE_MEM("Tgt sg used for sense for cmd %p", cmd);
goto go;
}
if (cmd->bufflen == 0)
cmd->bufflen = cmd->cdb[4];
cmd->sg = scst_alloc_sg(cmd->bufflen, GFP_ATOMIC, &cmd->sg_cnt);
if (cmd->sg == NULL) {
PRINT_ERROR("Unable to alloc sg for REQUEST SENSE"
"(sense %x/%x/%x)", key, asc, ascq);
res = 1;
goto out;
}
TRACE_MEM("sg %p alloced for sense for cmd %p (cnt %d, "
"len %d)", cmd->sg, cmd, cmd->sg_cnt, cmd->bufflen);
}
go:
sg = cmd->sg;
len = sg->length;
TRACE_MEM("sg %p (len %d) for sense for cmd %p", sg, len, cmd);
sense_len = scst_set_sense(sg_virt(sg), len, cmd->cdb[1] & 1,
key, asc, ascq);
TRACE_BUFFER("Sense set", sg_virt(sg), sense_len);
cmd->data_direction = SCST_DATA_READ;
scst_set_resp_data_len(cmd, sense_len);
res = 0;
cmd->completed = 1;
cmd->resid_possible = 1;
out:
TRACE_EXIT_RES(res);
return res;
}
static int scst_set_lun_not_supported_inquiry(struct scst_cmd *cmd)
{
int res;
uint8_t *buf;
struct scatterlist *sg;
int len;
TRACE_ENTRY();
if (cmd->status != 0) {
TRACE_MGMT_DBG("cmd %p already has status %x set", cmd,
cmd->status);
res = -EEXIST;
goto out;
}
if (cmd->sg == NULL) {
if (cmd->bufflen == 0)
cmd->bufflen = min_t(int, 36, get_unaligned_be16(&cmd->cdb[3]));
/*
* If target driver preparing data buffer using tgt_alloc_data_buf()
* callback, it is responsible to copy the sense to its buffer
* in xmit_response().
*/
if (cmd->tgt_i_data_buf_alloced && (cmd->tgt_i_sg != NULL)) {
cmd->sg = cmd->tgt_i_sg;
cmd->sg_cnt = cmd->tgt_i_sg_cnt;
TRACE_MEM("Tgt used for INQUIRY for not supported "
"LUN for cmd %p", cmd);
goto go;
}
cmd->sg = scst_alloc_sg(cmd->bufflen, GFP_ATOMIC, &cmd->sg_cnt);
if (cmd->sg == NULL) {
PRINT_ERROR("%s", "Unable to alloc sg for INQUIRY "
"for not supported LUN");
res = 1;
goto out;
}
TRACE_MEM("sg %p alloced for INQUIRY for not supported LUN for "
"cmd %p (cnt %d, len %d)", cmd->sg, cmd, cmd->sg_cnt,
cmd->bufflen);
}
go:
sg = cmd->sg;
len = sg->length;
TRACE_MEM("sg %p (len %d) for INQUIRY for cmd %p", sg, len, cmd);
buf = sg_virt(sg);
len = min_t(int, 36, len);
memset(buf, 0, len);
buf[0] = 0x7F; /* Peripheral qualifier 011b, Peripheral device type 1Fh */
buf[2] = 6; /* Device complies to SPC-4 */
buf[4] = len - 4;
TRACE_BUFFER("INQUIRY for not supported LUN set", buf, len);
cmd->data_direction = SCST_DATA_READ;
scst_set_resp_data_len(cmd, len);
res = 0;
cmd->completed = 1;
cmd->resid_possible = 1;
out:
TRACE_EXIT_RES(res);
return res;
}
/*
* scst_set_cmd_error() - set error in the command and fill the sense buffer.
*
* Sets error in the command and fill the sense buffer. Returns 0 on success,
* error code otherwise.
*/
int scst_set_cmd_error(struct scst_cmd *cmd, int key, int asc, int ascq)
{
int res;
TRACE_ENTRY();
/*
* We need for LOGICAL UNIT NOT SUPPORTED special handling for
* REQUEST SENSE and INQUIRY.
*/
if ((key == ILLEGAL_REQUEST) && (asc == 0x25) && (ascq == 0)) {
if (cmd->cdb[0] == REQUEST_SENSE)
res = scst_set_lun_not_supported_request_sense(cmd,
key, asc, ascq);
else if (cmd->cdb[0] == INQUIRY)
res = scst_set_lun_not_supported_inquiry(cmd);
else
goto do_sense;
if (res > 0)
goto do_sense;
else
goto out;
}
do_sense:
res = scst_set_cmd_error_status(cmd, SAM_STAT_CHECK_CONDITION);
if (res != 0)
goto out;
res = scst_alloc_sense(cmd, 1);
if (res != 0) {
PRINT_ERROR("Lost sense data (key %x, asc %x, ascq %x)",
key, asc, ascq);
goto out;
}
cmd->sense_valid_len = scst_set_sense(cmd->sense, cmd->sense_buflen,
scst_get_cmd_dev_d_sense(cmd), key, asc, ascq);
out:
TRACE_EXIT_RES(res);
return res;
}
EXPORT_SYMBOL(scst_set_cmd_error);
int scst_set_cmd_error_and_inf(struct scst_cmd *cmd, int key, int asc,
int ascq, uint64_t information)
{
int res;
res = scst_set_cmd_error(cmd, key, asc, ascq);
if (res)
goto out;
switch (cmd->sense[0] & 0x7f) {
case 0x70:
{
/* Fixed format */
uint32_t i = information;
cmd->sense[0] |= 0x80; /* Information field is valid */
put_unaligned_be32(i, &cmd->sense[3]);
break;
}
case 0x72:
/* Descriptor format */
cmd->sense[7] = 12; /* additional sense length */
cmd->sense[8 + 0] = 0; /* descriptor type: Information */
cmd->sense[8 + 1] = 10; /* Additional length */
cmd->sense[8 + 2] = 0x80; /* VALID */
put_unaligned_be64(information, &cmd->sense[8 + 4]);
break;
default:
sBUG();
}
out:
return res;
}
EXPORT_SYMBOL(scst_set_cmd_error_and_inf);
static void scst_fill_field_pointer_sense(uint8_t *fp_sense, int field_offs,
int bit_offs, bool cdb)
{
/* Sense key specific */
fp_sense[0] = 0x80; /* SKSV */
if (cdb)
fp_sense[0] |= 0x40; /* C/D */
if ((bit_offs & SCST_INVAL_FIELD_BIT_OFFS_VALID) != 0)
fp_sense[0] |= (8 | (bit_offs & 7));
put_unaligned_be16(field_offs, &fp_sense[1]);
return;
}
static int scst_set_invalid_field_in(struct scst_cmd *cmd, int field_offs,
int bit_offs, bool cdb)
{
int res, asc = cdb ? 0x24 : 0x26; /* inval field in CDB or param list */
int d_sense = scst_get_cmd_dev_d_sense(cmd);
TRACE_ENTRY();
TRACE_DBG("cmd %p, cdb %d, bit_offs %d, field_offs %d (d_sense %d)",
cmd, cdb, bit_offs, field_offs, d_sense);
res = scst_set_cmd_error_status(cmd, SAM_STAT_CHECK_CONDITION);
if (res != 0)
goto out;
res = scst_alloc_sense(cmd, 1);
if (res != 0) {
PRINT_ERROR("Lost %s sense data", cdb ? "INVALID FIELD IN CDB" :
"INVALID FIELD IN PARAMETERS LIST");
goto out;
}
sBUG_ON(cmd->sense_buflen < 18);
BUILD_BUG_ON(SCST_SENSE_BUFFERSIZE < 18);
if (d_sense) {
/* Descriptor format */
cmd->sense[0] = 0x72;
cmd->sense[1] = ILLEGAL_REQUEST;
cmd->sense[2] = asc;
cmd->sense[3] = 0; /* ASCQ */
cmd->sense[7] = 8; /* additional Sense Length */
cmd->sense[8] = 2; /* sense key specific descriptor */
cmd->sense[9] = 6;
scst_fill_field_pointer_sense(&cmd->sense[12], field_offs,
bit_offs, cdb);
cmd->sense_valid_len = 16;
} else {
/* Fixed format */
cmd->sense[0] = 0x70;
cmd->sense[2] = ILLEGAL_REQUEST;
cmd->sense[7] = 0x0a; /* additional Sense Length */
cmd->sense[12] = asc;
cmd->sense[13] = 0; /* ASCQ */
scst_fill_field_pointer_sense(&cmd->sense[15], field_offs,
bit_offs, cdb);
cmd->sense_valid_len = 18;
}
TRACE_BUFFER("Sense set", cmd->sense, cmd->sense_valid_len);
out:
TRACE_EXIT_RES(res);
return res;
}
int scst_set_invalid_field_in_cdb(struct scst_cmd *cmd, int field_offs,
int bit_offs)
{
return scst_set_invalid_field_in(cmd, field_offs, bit_offs, true);
}
EXPORT_SYMBOL(scst_set_invalid_field_in_cdb);
int scst_set_invalid_field_in_parm_list(struct scst_cmd *cmd, int field_offs,
int bit_offs)
{
return scst_set_invalid_field_in(cmd, field_offs, bit_offs, false);
}
EXPORT_SYMBOL(scst_set_invalid_field_in_parm_list);
/*
* scst_set_sense() - set sense from KEY/ASC/ASCQ numbers
*
* Sets the corresponding fields in the sense buffer taking sense type
* into account. Returns resulting sense length.
*/
int scst_set_sense(uint8_t *buffer, int len, bool d_sense,
int key, int asc, int ascq)
{
int res;
sBUG_ON(len == 0);
memset(buffer, 0, len);
/*
* The RESPONSE CODE field shall be set to 70h in all unit attention
* condition sense data in which:
* a) the ADDITIONAL SENSE CODE field is set to 29h; or
* b) the additional sense code is set to MODE PARAMETERS CHANGED.
*/
if ((key == UNIT_ATTENTION) &&
((asc == 0x29) || ((asc == 0x2A) && (ascq == 1))))
d_sense = false;
if (d_sense) {
/* Descriptor format */
if (len < 8) {
PRINT_ERROR("Length %d of sense buffer too small to "
"fit sense %x:%x:%x", len, key, asc, ascq);
}
buffer[0] = 0x72; /* Response Code */
if (len > 1)
buffer[1] = key; /* Sense Key */
if (len > 2)
buffer[2] = asc; /* ASC */
if (len > 3)
buffer[3] = ascq; /* ASCQ */
res = 8;
} else {
/* Fixed format */
if (len < 18) {
PRINT_ERROR("Length %d of sense buffer too small to "
"fit sense %x:%x:%x", len, key, asc, ascq);
}
buffer[0] = 0x70; /* Response Code */
if (len > 2)
buffer[2] = key; /* Sense Key */
if (len > 7)
buffer[7] = 0x0a; /* Additional Sense Length */
if (len > 12)
buffer[12] = asc; /* ASC */
if (len > 13)
buffer[13] = ascq; /* ASCQ */
res = 18;
}
TRACE_BUFFER("Sense set", buffer, res);
return res;
}
EXPORT_SYMBOL(scst_set_sense);
/*
* scst_analyze_sense() - analyze sense
*
* Returns true if sense matches to (key, asc, ascq) and false otherwise.
* Valid_mask is one or several SCST_SENSE_*_VALID constants setting valid
* (key, asc, ascq) values.
*/
bool scst_analyze_sense(const uint8_t *sense, int len, unsigned int valid_mask,
int key, int asc, int ascq)
{
bool res = false;
/* Response Code */
if ((scst_sense_response_code(sense) == 0x70) ||
(scst_sense_response_code(sense) == 0x71)) {
/* Fixed format */
/* Sense Key */
if (valid_mask & SCST_SENSE_KEY_VALID) {
if (len < 3)
goto out;
if (sense[2] != key)
goto out;
}
/* ASC */
if (valid_mask & SCST_SENSE_ASC_VALID) {
if (len < 13)
goto out;
if (sense[12] != asc)
goto out;
}
/* ASCQ */
if (valid_mask & SCST_SENSE_ASCQ_VALID) {
if (len < 14)
goto out;
if (sense[13] != ascq)
goto out;
}
} else if ((scst_sense_response_code(sense) == 0x72) ||
(scst_sense_response_code(sense) == 0x73)) {
/* Descriptor format */
/* Sense Key */
if (valid_mask & SCST_SENSE_KEY_VALID) {
if (len < 2)
goto out;
if (sense[1] != key)
goto out;
}
/* ASC */
if (valid_mask & SCST_SENSE_ASC_VALID) {
if (len < 3)
goto out;
if (sense[2] != asc)
goto out;
}
/* ASCQ */
if (valid_mask & SCST_SENSE_ASCQ_VALID) {
if (len < 4)
goto out;
if (sense[3] != ascq)
goto out;
}
} else {
PRINT_ERROR("Unknown sense response code 0x%x",
scst_sense_response_code(sense));
goto out;
}
res = true;
out:
TRACE_EXIT_RES((int)res);
return res;
}
EXPORT_SYMBOL(scst_analyze_sense);
/*
* scst_is_ua_sense() - determine if the sense is UA sense
*
* Returns true if the sense is valid and carrying a Unit
* Attention or false otherwise.
*/
bool scst_is_ua_sense(const uint8_t *sense, int len)
{
if (scst_sense_valid(sense))
return scst_analyze_sense(sense, len,
SCST_SENSE_KEY_VALID, UNIT_ATTENTION, 0, 0);
else
return false;
}
EXPORT_SYMBOL(scst_is_ua_sense);
bool scst_is_ua_global(const uint8_t *sense, int len)
{
bool res;
/* Changing it don't forget to change scst_requeue_ua() as well!! */
if (scst_analyze_sense(sense, len, SCST_SENSE_ALL_VALID,
SCST_LOAD_SENSE(scst_sense_reported_luns_data_changed)))
res = true;
else
res = false;
return res;
}
/*
* scst_check_convert_sense() - check sense type and convert it if needed
*
* Checks if sense in the sense buffer, if any, is in the correct format.
* If not, converts it in the correct format.
*
* WARNING! This function converts only RESPONSE CODE, ASC and ASC codes,
* dropping enverything else, including corresponding descriptors from
* descriptor format sense! ToDo: fix it.
*/
void scst_check_convert_sense(struct scst_cmd *cmd)
{
bool d_sense;
TRACE_ENTRY();
if ((cmd->sense == NULL) || (cmd->status != SAM_STAT_CHECK_CONDITION))
goto out;
d_sense = scst_get_cmd_dev_d_sense(cmd);
if (d_sense && ((scst_sense_response_code(cmd->sense) == 0x70) ||
(scst_sense_response_code(cmd->sense) == 0x71)) &&
/*
* The RESPONSE CODE field shall be set to 70h in all unit attention
* condition sense data in which:
* a) the ADDITIONAL SENSE CODE field is set to 29h; or
* b) the additional sense code is set to MODE PARAMETERS CHANGED.
*/
!((cmd->sense[2] == UNIT_ATTENTION) &&
((cmd->sense[12] == 0x29) ||
((cmd->sense[12] == 0x2A) && (cmd->sense[13] == 1))))) {
TRACE_MGMT_DBG("Converting fixed sense to descriptor (cmd %p)", cmd);
if ((cmd->sense_valid_len < 18)) {
PRINT_ERROR("Sense too small to convert (%d, "
"type: fixed)", cmd->sense_buflen);
goto out;
}
cmd->sense_valid_len = scst_set_sense(cmd->sense, cmd->sense_buflen,
d_sense, cmd->sense[2], cmd->sense[12], cmd->sense[13]);
} else if (!d_sense && ((scst_sense_response_code(cmd->sense) == 0x72) ||
(scst_sense_response_code(cmd->sense) == 0x73))) {
TRACE_MGMT_DBG("Converting descriptor sense to fixed (cmd %p)",
cmd);
if ((cmd->sense_buflen < 18) || (cmd->sense_valid_len < 8)) {
PRINT_ERROR("Sense too small to convert (%d, "
"type: descriptor, valid %d)",
cmd->sense_buflen, cmd->sense_valid_len);
goto out;
}
cmd->sense_valid_len = scst_set_sense(cmd->sense,
cmd->sense_buflen, d_sense,
cmd->sense[1], cmd->sense[2], cmd->sense[3]);
}
out:
TRACE_EXIT();
return;
}
EXPORT_SYMBOL(scst_check_convert_sense);
int scst_set_cmd_error_sense(struct scst_cmd *cmd, uint8_t *sense,
unsigned int len)
{
int res;
TRACE_ENTRY();
res = scst_set_cmd_error_status(cmd, SAM_STAT_CHECK_CONDITION);
if (res != 0)
goto out;
res = scst_alloc_set_sense(cmd, 1, sense, len);
out:
TRACE_EXIT_RES(res);
return res;
}
/*
* scst_set_busy() - set BUSY or TASK QUEUE FULL status
*
* Sets BUSY or TASK QUEUE FULL status depending on if this session has other
* outstanding commands or not.
*/
void scst_set_busy(struct scst_cmd *cmd)
{
int c = atomic_read(&cmd->sess->sess_cmd_count);
TRACE_ENTRY();
if ((c <= 1) || (cmd->sess->init_phase != SCST_SESS_IPH_READY)) {
scst_set_cmd_error_status(cmd, SAM_STAT_BUSY);
TRACE(TRACE_FLOW_CONTROL, "Sending BUSY status to initiator %s "
"(cmds count %d, queue_type %x, sess->init_phase %d)",
cmd->sess->initiator_name, c,
cmd->queue_type, cmd->sess->init_phase);
} else {
scst_set_cmd_error_status(cmd, SAM_STAT_TASK_SET_FULL);
TRACE(TRACE_FLOW_CONTROL, "Sending QUEUE_FULL status to "
"initiator %s (cmds count %d, queue_type %x, "
"sess->init_phase %d)", cmd->sess->initiator_name, c,
cmd->queue_type, cmd->sess->init_phase);
}
TRACE_EXIT();
return;
}
EXPORT_SYMBOL(scst_set_busy);
/*
* scst_set_initial_UA() - set initial Unit Attention
*
* Sets initial Unit Attention on all devices of the session,
* replacing default scst_sense_reset_UA
*/
void scst_set_initial_UA(struct scst_session *sess, int key, int asc, int ascq)
{
int i;
TRACE_ENTRY();
TRACE_MGMT_DBG("Setting for sess %p initial UA %x/%x/%x", sess, key,
asc, ascq);
rcu_read_lock();
for (i = 0; i < SESS_TGT_DEV_LIST_HASH_SIZE; i++) {
struct list_head *head = &sess->sess_tgt_dev_list[i];
struct scst_tgt_dev *tgt_dev;
list_for_each_entry_rcu(tgt_dev, head,
sess_tgt_dev_list_entry) {
spin_lock_bh(&tgt_dev->tgt_dev_lock);
if (!list_empty(&tgt_dev->UA_list)) {
struct scst_tgt_dev_UA *ua;
ua = list_first_entry(&tgt_dev->UA_list,
typeof(*ua), UA_list_entry);
if (scst_analyze_sense(ua->UA_sense_buffer,
ua->UA_valid_sense_len,
SCST_SENSE_ALL_VALID,
SCST_LOAD_SENSE(scst_sense_reset_UA))) {
ua->UA_valid_sense_len = scst_set_sense(
ua->UA_sense_buffer,
sizeof(ua->UA_sense_buffer),
tgt_dev->dev->d_sense,
key, asc, ascq);
} else
PRINT_ERROR("%s",
"The first UA isn't RESET UA");
} else
PRINT_ERROR("%s", "There's no RESET UA to "
"replace");
spin_unlock_bh(&tgt_dev->tgt_dev_lock);
}
}
rcu_read_unlock();
TRACE_EXIT();
return;
}
EXPORT_SYMBOL(scst_set_initial_UA);
struct scst_aen *scst_alloc_aen(struct scst_session *sess,
uint64_t unpacked_lun)
{
struct scst_aen *aen;
TRACE_ENTRY();
aen = mempool_alloc(scst_aen_mempool, GFP_KERNEL);
if (aen == NULL) {
PRINT_ERROR("AEN memory allocation failed. Corresponding "
"event notification will not be performed (initiator "
"%s)", sess->initiator_name);
goto out;
}
memset(aen, 0, sizeof(*aen));
aen->sess = sess;
scst_sess_get(sess);
aen->lun = scst_pack_lun(unpacked_lun, sess->acg->addr_method);
out:
TRACE_EXIT_HRES((unsigned long)aen);
return aen;
}
void scst_free_aen(struct scst_aen *aen)
{
TRACE_ENTRY();
scst_sess_put(aen->sess);
mempool_free(aen, scst_aen_mempool);
TRACE_EXIT();
return;
}
#ifdef CONFIG_SCST_EXTRACHECKS
static bool scst_is_active_tgt_dev(struct scst_tgt_dev *tgt_dev)
{
bool is_active;
rcu_read_lock();
is_active = scst_lookup_tgt_dev(tgt_dev->sess, tgt_dev->lun) == tgt_dev;
rcu_read_unlock();
return is_active;
}
#endif
/*
* The caller must ensure that tgt_dev does not disappear while this function
* is in progress.
*/
void scst_gen_aen_or_ua(struct scst_tgt_dev *tgt_dev,
int key, int asc, int ascq)
{
struct scst_session *sess = tgt_dev->sess;
struct scst_tgt_template *tgtt = sess->tgt->tgtt;
uint8_t sense_buffer[SCST_STANDARD_SENSE_LEN];
int sl;
TRACE_ENTRY();
if (sess->init_phase != SCST_SESS_IPH_READY ||
sess->shut_phase != SCST_SESS_SPH_READY)
goto out;
if (tgtt->report_aen != NULL) {
struct scst_aen *aen;
int rc;
aen = scst_alloc_aen(sess, tgt_dev->lun);
if (aen == NULL)
goto queue_ua;
aen->event_fn = SCST_AEN_SCSI;
aen->aen_sense_len = scst_set_sense(aen->aen_sense,
sizeof(aen->aen_sense), tgt_dev->dev->d_sense,
key, asc, ascq);
TRACE_DBG("Calling target's %s report_aen(%p)",
tgtt->name, aen);
rc = tgtt->report_aen(aen);
TRACE_DBG("Target's %s report_aen(%p) returned %d",
tgtt->name, aen, rc);
if (rc == SCST_AEN_RES_SUCCESS)
goto out;
scst_free_aen(aen);
}
queue_ua:
TRACE_MGMT_DBG("AEN not supported, queueing plain UA (tgt_dev %p)",
tgt_dev);
sl = scst_set_sense(sense_buffer, sizeof(sense_buffer),
tgt_dev->dev->d_sense, key, asc, ascq);
scst_check_set_UA(tgt_dev, sense_buffer, sl, 0);
out:
TRACE_EXIT();
return;
}
/*
* scst_capacity_data_changed() - notify SCST about device capacity change
*
* Notifies SCST core that dev has changed its capacity. Called under no locks.
*/
void scst_capacity_data_changed(struct scst_device *dev)
{
struct scst_tgt_dev *tgt_dev;
TRACE_ENTRY();
if (dev->type != TYPE_DISK) {
TRACE_MGMT_DBG("Device type %d isn't for CAPACITY DATA "
"CHANGED UA", dev->type);
goto out;
}
TRACE_MGMT_DBG("CAPACITY DATA CHANGED (dev %p)", dev);
mutex_lock(&scst_mutex);
list_for_each_entry(tgt_dev, &dev->dev_tgt_dev_list,
dev_tgt_dev_list_entry) {
scst_gen_aen_or_ua(tgt_dev,
SCST_LOAD_SENSE(scst_sense_capacity_data_changed));
}
mutex_unlock(&scst_mutex);
out:
TRACE_EXIT();
return;
}
EXPORT_SYMBOL_GPL(scst_capacity_data_changed);
static inline bool scst_is_report_luns_changed_type(int type)
{
switch (type) {
case TYPE_DISK:
case TYPE_TAPE:
case TYPE_PRINTER:
case TYPE_PROCESSOR:
case TYPE_WORM:
case TYPE_ROM:
case TYPE_SCANNER:
case TYPE_MOD:
case TYPE_MEDIUM_CHANGER:
case TYPE_RAID:
case TYPE_ENCLOSURE:
return true;
default:
return false;
}
}
static void scst_queue_report_luns_changed_UA(struct scst_session *sess,
int flags)
{
uint8_t sense_buffer[SCST_STANDARD_SENSE_LEN];
struct list_head *head;
struct scst_tgt_dev *tgt_dev;
int i;
TRACE_ENTRY();
TRACE_MGMT_DBG("Queueing REPORTED LUNS DATA CHANGED UA "
"(sess %p)", sess);
local_bh_disable();
rcu_read_lock();
#if !defined(__CHECKER__)
for (i = 0; i < SESS_TGT_DEV_LIST_HASH_SIZE; i++) {
head = &sess->sess_tgt_dev_list[i];
list_for_each_entry_rcu(tgt_dev, head,
sess_tgt_dev_list_entry) {
/* Lockdep reports a false positive here before v5.1. */
spin_lock(&tgt_dev->tgt_dev_lock);
}
}
#endif
for (i = 0; i < SESS_TGT_DEV_LIST_HASH_SIZE; i++) {
head = &sess->sess_tgt_dev_list[i];
list_for_each_entry_rcu(tgt_dev, head,
sess_tgt_dev_list_entry) {
int sl;
if (!scst_is_report_luns_changed_type(
tgt_dev->dev->type))
continue;
sl = scst_set_sense(sense_buffer, sizeof(sense_buffer),
tgt_dev->dev->d_sense,
SCST_LOAD_SENSE(scst_sense_reported_luns_data_changed));
__scst_check_set_UA(tgt_dev, sense_buffer,
sl, flags | SCST_SET_UA_FLAG_GLOBAL);
}
}
#if !defined(__CHECKER__)
for (i = SESS_TGT_DEV_LIST_HASH_SIZE-1; i >= 0; i--) {
head = &sess->sess_tgt_dev_list[i];
list_for_each_entry_rcu(tgt_dev, head,
sess_tgt_dev_list_entry) {
spin_unlock(&tgt_dev->tgt_dev_lock);
}
}
#endif
rcu_read_unlock();
local_bh_enable();
TRACE_EXIT();
return;
}
static void scst_report_luns_changed_sess(struct scst_session *sess)
{
int i;
struct scst_tgt_template *tgtt = sess->tgt->tgtt;
int d_sense = 0;
uint64_t lun = 0;
TRACE_ENTRY();
if ((sess->init_phase != SCST_SESS_IPH_READY) ||
(sess->shut_phase != SCST_SESS_SPH_READY))
goto out;
TRACE_DBG("REPORTED LUNS DATA CHANGED (sess %p)", sess);
rcu_read_lock();
for (i = 0; i < SESS_TGT_DEV_LIST_HASH_SIZE; i++) {
struct list_head *head;
struct scst_tgt_dev *tgt_dev;
head = &sess->sess_tgt_dev_list[i];
list_for_each_entry_rcu(tgt_dev, head,
sess_tgt_dev_list_entry) {
if (scst_is_report_luns_changed_type(
tgt_dev->dev->type)) {
lun = tgt_dev->lun;
d_sense = tgt_dev->dev->d_sense;
goto found;
}
}
}
found:
rcu_read_unlock();
if (tgtt->report_aen != NULL) {
struct scst_aen *aen;
int rc;
aen = scst_alloc_aen(sess, lun);
if (aen == NULL)
goto queue_ua;
aen->event_fn = SCST_AEN_SCSI;
aen->aen_sense_len = scst_set_sense(aen->aen_sense,
sizeof(aen->aen_sense), d_sense,
SCST_LOAD_SENSE(scst_sense_reported_luns_data_changed));
TRACE_DBG("Calling target's %s report_aen(%p)",
tgtt->name, aen);
rc = tgtt->report_aen(aen);
TRACE_DBG("Target's %s report_aen(%p) returned %d",
tgtt->name, aen, rc);
if (rc == SCST_AEN_RES_SUCCESS)
goto out;
scst_free_aen(aen);
}
queue_ua:
scst_queue_report_luns_changed_UA(sess, 0);
out:
TRACE_EXIT();
return;
}
void scst_report_luns_changed(struct scst_acg *acg)
{
struct scst_session *sess;
TRACE_ENTRY();
/* To protect acg_sess_list */
lockdep_assert_held(&scst_mutex);
TRACE_DBG("REPORTED LUNS DATA CHANGED (acg %s)", acg->acg_name);
list_for_each_entry(sess, &acg->acg_sess_list, acg_sess_list_entry) {
scst_report_luns_changed_sess(sess);
}
TRACE_EXIT();
return;
}
/*
* scst_aen_done() - AEN processing done
*
* Notifies SCST that the driver has sent the AEN and it
* can be freed now. Don't forget to set the delivery status, if it
* isn't success, using scst_set_aen_delivery_status() before calling
* this function.
*/
void scst_aen_done(struct scst_aen *aen)
{
TRACE_ENTRY();
TRACE_MGMT_DBG("AEN %p (fn %d) done (initiator %s)", aen,
aen->event_fn, aen->sess->initiator_name);
if (aen->delivery_status == SCST_AEN_RES_SUCCESS)
goto out_free;
if (aen->event_fn != SCST_AEN_SCSI)
goto out_free;
TRACE_MGMT_DBG("Delivery of SCSI AEN failed (initiator %s)",
aen->sess->initiator_name);
if (scst_analyze_sense(aen->aen_sense, aen->aen_sense_len,
SCST_SENSE_ALL_VALID, SCST_LOAD_SENSE(
scst_sense_reported_luns_data_changed))) {
scst_queue_report_luns_changed_UA(aen->sess,
SCST_SET_UA_FLAG_AT_HEAD);
} else {
struct scst_session *sess = aen->sess;
struct scst_tgt_dev *tgt_dev;
uint64_t lun;
lun = scst_unpack_lun((uint8_t *)&aen->lun, sizeof(aen->lun));
rcu_read_lock();
/* tgt_dev might get dead, so we need to reseek it */
tgt_dev = scst_lookup_tgt_dev(sess, lun);
if (tgt_dev) {
TRACE_MGMT_DBG("Requeuing failed AEN UA for tgt_dev %p",
tgt_dev);
scst_check_set_UA(tgt_dev, aen->aen_sense,
aen->aen_sense_len,
SCST_SET_UA_FLAG_AT_HEAD);
}
rcu_read_unlock();
}
out_free:
scst_free_aen(aen);
TRACE_EXIT();
return;
}
EXPORT_SYMBOL(scst_aen_done);
void scst_requeue_ua(struct scst_cmd *cmd, const uint8_t *buf, int size)
{
TRACE_ENTRY();
if (buf == NULL) {
buf = cmd->sense;
size = cmd->sense_valid_len;
}
if (scst_analyze_sense(buf, size, SCST_SENSE_ALL_VALID,
SCST_LOAD_SENSE(scst_sense_reported_luns_data_changed))) {
TRACE_MGMT_DBG("Requeuing REPORTED LUNS DATA CHANGED UA "
"for delivery failed cmd %p", cmd);
scst_queue_report_luns_changed_UA(cmd->sess,
SCST_SET_UA_FLAG_AT_HEAD);
} else {
TRACE_MGMT_DBG("Requeuing UA for delivery failed cmd %p", cmd);
scst_check_set_UA(cmd->tgt_dev, buf, size, SCST_SET_UA_FLAG_AT_HEAD);
}
TRACE_EXIT();
return;
}
void scst_dev_inquiry_data_changed(struct scst_device *dev)
{
struct scst_tgt_dev *tgt_dev;
TRACE_ENTRY();
TRACE_MGMT_DBG("Updating INQUIRY data for dev %s", dev->virt_name);
mutex_lock(&scst_mutex);
list_for_each_entry(tgt_dev, &dev->dev_tgt_dev_list, dev_tgt_dev_list_entry) {
TRACE_DBG("INQUIRY DATA HAS CHANGED on tgt_dev %p", tgt_dev);
scst_gen_aen_or_ua(tgt_dev, SCST_LOAD_SENSE(scst_sense_inquiry_data_changed));
}
mutex_unlock(&scst_mutex);
scst_cm_update_dev(dev);
TRACE_EXIT();
return;
}
EXPORT_SYMBOL(scst_dev_inquiry_data_changed);
/* The activity supposed to be suspended and scst_mutex held */
static void scst_check_reassign_sess(struct scst_session *sess)
{
struct scst_acg *acg, *old_acg;
struct scst_acg_dev *acg_dev;
int i, rc;
struct list_head *head;
struct scst_tgt_dev *tgt_dev;
bool luns_changed = false;
bool add_failed, something_freed;
TRACE_ENTRY();
if (sess->shut_phase != SCST_SESS_SPH_READY)
goto out;
TRACE_DBG("Checking reassignment for sess %p (initiator %s)",
sess, sess->initiator_name);
acg = scst_find_acg(sess);
if (acg == sess->acg) {
TRACE_DBG("No reassignment for sess %p", sess);
goto out;
}
PRINT_INFO("sess %p (initiator %s) will be reassigned from acg %s to "
"acg %s", sess, sess->initiator_name, sess->acg->acg_name,
acg->acg_name);
old_acg = sess->acg;
sess->acg = NULL; /* to catch implicit dependencies earlier */
retry_add:
add_failed = false;
list_for_each_entry(acg_dev, &acg->acg_dev_list, acg_dev_list_entry) {
bool inq_changed_ua_needed = false;
mutex_lock(&sess->tgt_dev_list_mutex);
for (i = 0; i < SESS_TGT_DEV_LIST_HASH_SIZE; i++) {
head = &sess->sess_tgt_dev_list[i];
list_for_each_entry_rcu(tgt_dev, head,
sess_tgt_dev_list_entry) {
if ((tgt_dev->dev == acg_dev->dev) &&
(tgt_dev->lun == acg_dev->lun) &&
(tgt_dev->acg_dev->acg_dev_rd_only == acg_dev->acg_dev_rd_only)) {
TRACE_MGMT_DBG("sess %p: tgt_dev %p for "
"LUN %lld stays the same",
sess, tgt_dev,
(unsigned long long)tgt_dev->lun);
tgt_dev->acg_dev = acg_dev;
mutex_unlock(&sess->tgt_dev_list_mutex);
goto next;
} else if (tgt_dev->lun == acg_dev->lun) {
TRACE_MGMT_DBG("Replacing LUN %lld",
(long long)tgt_dev->lun);
scst_del_tgt_dev(tgt_dev);
synchronize_rcu();
scst_free_tgt_dev(tgt_dev);
inq_changed_ua_needed = 1;
break;
}
}
}
mutex_unlock(&sess->tgt_dev_list_mutex);
luns_changed = true;
TRACE_MGMT_DBG("sess %p: Allocing new tgt_dev for LUN %lld",
sess, (unsigned long long)acg_dev->lun);
rc = scst_alloc_add_tgt_dev(sess, acg_dev, &tgt_dev);
if (rc == -EPERM)
continue;
else if (rc != 0) {
add_failed = true;
break;
}
tgt_dev->inq_changed_ua_needed = inq_changed_ua_needed;
next:
continue;
}
something_freed = false;
mutex_lock(&sess->tgt_dev_list_mutex);
for (i = 0; i < SESS_TGT_DEV_LIST_HASH_SIZE; i++) {
struct scst_tgt_dev *t;
head = &sess->sess_tgt_dev_list[i];
list_for_each_entry_safe(tgt_dev, t, head,
sess_tgt_dev_list_entry) {
if (tgt_dev->acg_dev->acg != acg) {
TRACE_MGMT_DBG("sess %p: Deleting not used "
"tgt_dev %p for LUN %lld",
sess, tgt_dev,
(unsigned long long)tgt_dev->lun);
luns_changed = true;
something_freed = true;
scst_del_tgt_dev(tgt_dev);
synchronize_rcu();
scst_free_tgt_dev(tgt_dev);
}
}
}
mutex_unlock(&sess->tgt_dev_list_mutex);
if (add_failed && something_freed) {
TRACE_MGMT_DBG("sess %p: Retrying adding new tgt_devs", sess);
goto retry_add;
}
sess->acg = acg;
TRACE_DBG("Moving sess %p from acg %s to acg %s", sess,
old_acg->acg_name, acg->acg_name);
list_move_tail(&sess->acg_sess_list_entry, &acg->acg_sess_list);
scst_get_acg(acg);
scst_put_acg(old_acg);
scst_recreate_sess_luns_link(sess);
/* Ignore possible error, since we can't do anything on it */
if (luns_changed) {
scst_report_luns_changed_sess(sess);
rcu_read_lock();
for (i = 0; i < SESS_TGT_DEV_LIST_HASH_SIZE; i++) {
head = &sess->sess_tgt_dev_list[i];
list_for_each_entry_rcu(tgt_dev, head,
sess_tgt_dev_list_entry) {
if (tgt_dev->inq_changed_ua_needed) {
TRACE_MGMT_DBG("sess %p: Setting "
"INQUIRY DATA HAS CHANGED UA "
"(tgt_dev %p)", sess, tgt_dev);
tgt_dev->inq_changed_ua_needed = 0;
scst_gen_aen_or_ua(tgt_dev,
SCST_LOAD_SENSE(scst_sense_inquiry_data_changed));
}
}
}
rcu_read_unlock();
}
out:
TRACE_EXIT();
return;
}
/* The activity supposed to be suspended and scst_mutex held */
void scst_check_reassign_sessions(void)
{
struct scst_tgt_template *tgtt;
TRACE_ENTRY();
list_for_each_entry(tgtt, &scst_template_list, scst_template_list_entry) {
struct scst_tgt *tgt;
list_for_each_entry(tgt, &tgtt->tgt_list, tgt_list_entry) {
struct scst_session *sess;
list_for_each_entry(sess, &tgt->sess_list,
sess_list_entry) {
scst_check_reassign_sess(sess);
}
}
}
TRACE_EXIT();
return;
}
int scst_get_cmd_abnormal_done_state(struct scst_cmd *cmd)
{
int res;
bool trace = false;
TRACE_ENTRY();
switch (cmd->state) {
case SCST_CMD_STATE_INIT_WAIT:
case SCST_CMD_STATE_INIT:
case SCST_CMD_STATE_PARSE:
case SCST_CMD_STATE_CSW1:
if (cmd->preprocessing_only) {
res = SCST_CMD_STATE_PREPROCESSING_DONE;
break;
}
trace = true;
fallthrough;
case SCST_CMD_STATE_DEV_DONE:
if (cmd->internal)
res = SCST_CMD_STATE_FINISHED_INTERNAL;
else
res = SCST_CMD_STATE_PRE_XMIT_RESP1;
break;
case SCST_CMD_STATE_PRE_DEV_DONE:
case SCST_CMD_STATE_MODE_SELECT_CHECKS:
res = SCST_CMD_STATE_DEV_DONE;
break;
case SCST_CMD_STATE_PRE_XMIT_RESP1:
res = SCST_CMD_STATE_PRE_XMIT_RESP2;
break;
case SCST_CMD_STATE_PRE_XMIT_RESP2:
res = SCST_CMD_STATE_XMIT_RESP;
break;
case SCST_CMD_STATE_PREPROCESSING_DONE:
case SCST_CMD_STATE_PREPROCESSING_DONE_CALLED:
if (cmd->tgt_dev == NULL) {
trace = true;
res = SCST_CMD_STATE_PRE_XMIT_RESP1;
} else
res = SCST_CMD_STATE_PRE_DEV_DONE;
break;
case SCST_CMD_STATE_PREPARE_SPACE:
if (cmd->preprocessing_only) {
res = SCST_CMD_STATE_PREPROCESSING_DONE;
break;
}
fallthrough;
case SCST_CMD_STATE_RDY_TO_XFER:
case SCST_CMD_STATE_DATA_WAIT:
case SCST_CMD_STATE_TGT_PRE_EXEC:
case SCST_CMD_STATE_EXEC_CHECK_BLOCKING:
case SCST_CMD_STATE_EXEC_CHECK_SN:
case SCST_CMD_STATE_LOCAL_EXEC:
case SCST_CMD_STATE_REAL_EXEC:
case SCST_CMD_STATE_EXEC_WAIT:
res = SCST_CMD_STATE_PRE_DEV_DONE;
break;
default:
PRINT_CRIT_ERROR("Wrong cmd state %d (cmd %p, op %s)",
cmd->state, cmd, scst_get_opcode_name(cmd));
sBUG();
#if defined(RHEL_MAJOR) && RHEL_MAJOR -0 < 6
/* Invalid state to suppress a compiler warning */
res = SCST_CMD_STATE_LAST_ACTIVE;
#endif
}
if (trace) {
/*
* Little hack to trace completion of commands, which are
* going to bypass normal tracing on SCST_CMD_STATE_PRE_DEV_DONE
*/
TRACE(TRACE_SCSI, "cmd %p, status %x, msg_status %x, host_status %x, "
"driver_status %x, resp_data_len %d", cmd, cmd->status,
cmd->msg_status, cmd->host_status, cmd->driver_status,
cmd->resp_data_len);
if (unlikely(cmd->status == SAM_STAT_CHECK_CONDITION) &&
scst_sense_valid(cmd->sense)) {
PRINT_BUFF_FLAG(TRACE_SCSI, "Sense", cmd->sense,
cmd->sense_valid_len);
}
}
TRACE_EXIT_RES(res);
return res;
}
EXPORT_SYMBOL_GPL(scst_get_cmd_abnormal_done_state);
/*
* scst_set_cmd_abnormal_done_state() - set command's next abnormal done state
*
* Sets state of the SCSI target state machine to abnormally complete command
* ASAP.
*/
void scst_set_cmd_abnormal_done_state(struct scst_cmd *cmd)
{
TRACE_ENTRY();
#ifdef CONFIG_SCST_EXTRACHECKS
switch (cmd->state) {
case SCST_CMD_STATE_XMIT_RESP:
case SCST_CMD_STATE_FINISHED:
case SCST_CMD_STATE_FINISHED_INTERNAL:
case SCST_CMD_STATE_XMIT_WAIT:
PRINT_CRIT_ERROR("Wrong cmd state %d (cmd %p, op %s)",
cmd->state, cmd, scst_get_opcode_name(cmd));
sBUG();
default:
break;
}
#endif
scst_set_cmd_state(cmd, scst_get_cmd_abnormal_done_state(cmd));
switch (cmd->state) {
case SCST_CMD_STATE_INIT_WAIT:
case SCST_CMD_STATE_INIT:
case SCST_CMD_STATE_PARSE:
case SCST_CMD_STATE_CSW1:
case SCST_CMD_STATE_PREPROCESSING_DONE:
case SCST_CMD_STATE_PREPROCESSING_DONE_CALLED:
case SCST_CMD_STATE_PREPARE_SPACE:
case SCST_CMD_STATE_RDY_TO_XFER:
case SCST_CMD_STATE_DATA_WAIT:
cmd->write_len = 0;
cmd->resid_possible = 1;
break;
case SCST_CMD_STATE_TGT_PRE_EXEC:
case SCST_CMD_STATE_EXEC_CHECK_SN:
case SCST_CMD_STATE_EXEC_CHECK_BLOCKING:
case SCST_CMD_STATE_LOCAL_EXEC:
case SCST_CMD_STATE_REAL_EXEC:
case SCST_CMD_STATE_EXEC_WAIT:
case SCST_CMD_STATE_DEV_DONE:
case SCST_CMD_STATE_PRE_DEV_DONE:
case SCST_CMD_STATE_MODE_SELECT_CHECKS:
case SCST_CMD_STATE_PRE_XMIT_RESP1:
case SCST_CMD_STATE_PRE_XMIT_RESP2:
case SCST_CMD_STATE_FINISHED_INTERNAL:
break;
default:
PRINT_CRIT_ERROR("Wrong cmd state %d (cmd %p, op %s)",
cmd->state, cmd, scst_get_opcode_name(cmd));
sBUG();
break;
}
#ifdef CONFIG_SCST_EXTRACHECKS
if (((cmd->state != SCST_CMD_STATE_PRE_XMIT_RESP1) &&
(cmd->state != SCST_CMD_STATE_PREPROCESSING_DONE)) &&
(cmd->tgt_dev == NULL) && !cmd->internal) {
PRINT_CRIT_ERROR("Wrong not inited cmd state %d (cmd %p, "
"op %s)", cmd->state, cmd, scst_get_opcode_name(cmd));
sBUG();
}
#endif
TRACE_EXIT();
return;
}
EXPORT_SYMBOL_GPL(scst_set_cmd_abnormal_done_state);
#if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING)
const char *scst_get_opcode_name(struct scst_cmd *cmd)
{
if (cmd->op_name)
return cmd->op_name;
else {
scnprintf(cmd->not_parsed_op_name,
sizeof(cmd->not_parsed_op_name), "0x%x", cmd->cdb[0]);
return cmd->not_parsed_op_name;
}
}
EXPORT_SYMBOL(scst_get_opcode_name);
#endif
void scst_zero_write_rest(struct scst_cmd *cmd)
{
int len, offs = 0;
uint8_t *buf;
TRACE_ENTRY();
len = scst_get_sg_buf_first(cmd, &buf, *cmd->write_sg,
*cmd->write_sg_cnt);
while (len > 0) {
int cur_offs;
if (offs + len <= cmd->write_len)
goto next;
else if (offs >= cmd->write_len)
cur_offs = 0;
else
cur_offs = cmd->write_len - offs;
memset(&buf[cur_offs], 0, len - cur_offs);
next:
offs += len;
scst_put_sg_buf(cmd, buf, *cmd->write_sg, *cmd->write_sg_cnt);
len = scst_get_sg_buf_next(cmd, &buf, *cmd->write_sg,
*cmd->write_sg_cnt);
}
TRACE_EXIT();
return;
}
/**
* __scst_adjust_sg - reduce the length of a scatterlist
* @cmd: [in] SCST command that owns the scatterlist.
* @sg: [in/out] Scatterlist of which to reduce the length.
* @sg_cnt: [in/out] Number of elements of the scatterlist.
* @adjust_len: [in] New length of the scatterlist in bytes.
* @orig_sg: [out] Information needed to restore the original scatterlist.
*
* Return:
* True if @adjust_len was less than or equal to the length of @sg; false
* otherwise.
*/
static bool __scst_adjust_sg(struct scst_cmd *cmd, struct scatterlist *sg,
int *sg_cnt, int adjust_len, struct scst_orig_sg_data *orig_sg)
{
struct scatterlist *sgi;
int i, l;
bool res = false;
TRACE_ENTRY();
l = 0;
for_each_sg(sg, sgi, *sg_cnt, i) {
TRACE_DBG("sg[%d/%d]: addr %p, offset %d, len %d", i, *sg_cnt,
sgi, sgi->offset, sgi->length);
l += sgi->length;
if (l >= adjust_len) {
int left = adjust_len - (l - sgi->length);
TRACE_DBG_FLAG(TRACE_SG_OP|TRACE_MEMORY|TRACE_DEBUG,
"cmd %p (tag %llu), sg %p, sg_cnt %d, "
"adjust_len %d, i %d, sg[j].length %d, left %d",
cmd, (unsigned long long)cmd->tag,
sg, *sg_cnt, adjust_len, i,
sgi->length, left);
orig_sg->p_orig_sg_cnt = sg_cnt;
orig_sg->orig_sg_cnt = *sg_cnt;
orig_sg->orig_sg_entry = sgi;
orig_sg->orig_entry_offs = sgi->offset;
orig_sg->orig_entry_len = sgi->length;
*sg_cnt = (left > 0) ? i+1 : i;
sgi->length = left;
res = true;
break;
}
}
TRACE_EXIT_RES(res);
return res;
}
/**
* scst_adjust_sg - reduce the length of the scatterlist of a command
* @cmd: [in/out] SCST command that owns the scatterlist.
* @reg_sg: [in] True selects cmd->sg; false selects cmd->write_sg.
* @adjust_len: [in] New length of the scatterlist in bytes.
*/
static void scst_adjust_sg(struct scst_cmd *cmd, bool reg_sg,
int adjust_len)
{
struct scatterlist *sg;
int *sg_cnt;
bool adjust_dif;
TRACE_ENTRY();
EXTRACHECKS_BUG_ON(cmd->sg_buff_modified || cmd->dif_sg_buff_modified);
if (reg_sg) {
sg = cmd->sg;
sg_cnt = &cmd->sg_cnt;
adjust_dif = (cmd->dif_sg != NULL);
} else {
sg = *cmd->write_sg;
sg_cnt = cmd->write_sg_cnt;
if (sg == cmd->sg)
adjust_dif = (cmd->dif_sg != NULL);
else
adjust_dif = false;
}
TRACE_DBG("reg_sg %d, adjust_len %d, adjust_dif %d", reg_sg,
adjust_len, adjust_dif);
cmd->sg_buff_modified = !!__scst_adjust_sg(cmd, sg, sg_cnt, adjust_len,
&cmd->orig_sg);
if (adjust_dif) {
adjust_len >>= (cmd->dev->block_shift - SCST_DIF_TAG_SHIFT);
TRACE_DBG("DIF adjust_len %d", adjust_len);
cmd->dif_sg_buff_modified = __scst_adjust_sg(cmd, cmd->dif_sg,
&cmd->dif_sg_cnt, adjust_len,
&cmd->orig_dif_sg);
}
TRACE_EXIT();
return;
}
/**
* __scst_adjust_sg_get_tail - reduce a scatterlist to its tail
* @cmd: [in] SCST command that owns the scatterlist.
* @sg: [in/out] Scatterlist of which to reduce the length.
* @sg_cnt: [in/out] Number of elements of the scatterlist.
* @res_sg: [out] Pointer to first scatterlist element of the tail.
* @res_sg_cnt: [out] Number of scatterlist elements in the tail.
* @adjust_len: [in] New length of the scatterlist in bytes.
* @orig_sg: [out] Information needed to restore the original scatterlist.
* @must_left: [in] How many bytes must remain in @res_sg to consider the
* operation successful.
*
* Return:
* 0 upon success; a negative value upon error.
*/
static int __scst_adjust_sg_get_tail(struct scst_cmd *cmd,
struct scatterlist *sg, int *sg_cnt,
struct scatterlist **res_sg, int *res_sg_cnt,
int adjust_len, struct scst_orig_sg_data *orig_sg, int must_left)
{
struct scatterlist *sgi;
int res = -ENOENT, i, l;
TRACE_ENTRY();
TRACE_DBG("cmd %p, sg_cnt %d, sg %p", cmd, *sg_cnt, sg);
l = 0;
for_each_sg(sg, sgi, *sg_cnt, i) {
TRACE_DBG("i %d, sg %p, len %d", i, sgi, sgi->length);
l += sgi->length;
if (l >= adjust_len) {
int offs = adjust_len - (l - sgi->length);
TRACE_DBG_FLAG(TRACE_SG_OP|TRACE_MEMORY|TRACE_DEBUG,
"cmd %p (tag %llu), sg %p, adjust_len %d, i %d, sg->length %d, offs %d",
cmd, (unsigned long long)cmd->tag,
sg, adjust_len, i, sgi->length, offs);
if (offs == sgi->length) {
sgi = sg_next(sgi);
i++;
offs = 0;
}
orig_sg->p_orig_sg_cnt = sg_cnt;
orig_sg->orig_sg_cnt = *sg_cnt;
orig_sg->orig_sg_entry = sgi;
orig_sg->orig_entry_offs = sgi->offset;
orig_sg->orig_entry_len = sgi->length;
sgi->offset += offs;
sgi->length -= offs;
*res_sg = sgi;
*res_sg_cnt = *sg_cnt - i;
TRACE_DBG("i %d, sg %p, off %d, len %d, cnt %d (offs %d)",
i, sgi, sgi->offset, sgi->length, *res_sg_cnt,
offs);
res = 0;
break;
}
}
if (res != 0)
goto out;
#ifdef CONFIG_SCST_EXTRACHECKS
l = 0;
for_each_sg(*res_sg, sgi, *res_sg_cnt, i)
l += sgi->length;
if (l != must_left) {
PRINT_ERROR("Incorrect length %d of adjusted sg (cmd %p, "
"expected %d)", l, cmd, must_left);
res = -EINVAL;
(*res_sg)->offset = orig_sg->orig_entry_offs;
(*res_sg)->length = orig_sg->orig_entry_len;
*res_sg = NULL;
*res_sg_cnt = 0;
goto out;
}
#endif
out:
TRACE_EXIT_RES(res);
return res;
}
/**
* scst_adjust_sg_get_tail - reduce a scatterlist of a command to its tail
* @cmd: [in] SCST command that owns the scatterlist. Information
* about how to restore the scatterlist will be stored
* in @cmd.
* @res_sg: [out] Pointer to first scatterlist element of the tail.
* @res_sg_cnt: [out] Number of scatterlist elements in the tail.
* @res_dif_sg: [out] Pointer to first scatterlist element of the DIF tail.
* @res_dif_sg_cnt: [out] Number of scatterlist elements in the DIF tail.
* @adjust_len: [in] New length of the scatterlist in bytes.
* @must_left: [in] How many bytes must remain in @res_sg to consider the
* operation successful.
*
* Return:
* 0 upon success; a negative value upon error.
*
* NOTE! Until scst_restore_sg_buff() is called, @cmd->sg is corrupted and
* must NOT be used!
*/
static int scst_adjust_sg_get_tail(struct scst_cmd *cmd,
struct scatterlist **res_sg, int *res_sg_cnt,
struct scatterlist **res_dif_sg, int *res_dif_sg_cnt,
int adjust_len, int must_left)
{
int res;
TRACE_ENTRY();
EXTRACHECKS_BUG_ON(cmd->sg_buff_modified || cmd->dif_sg_buff_modified);
res = __scst_adjust_sg_get_tail(cmd, cmd->sg, &cmd->sg_cnt, res_sg,
res_sg_cnt, adjust_len, &cmd->orig_sg, must_left);
if (res != 0)
goto out;
cmd->sg_buff_modified = 1;
if (cmd->dif_sg != NULL) {
adjust_len >>= (cmd->dev->block_shift - SCST_DIF_TAG_SHIFT);
must_left >>= (cmd->dev->block_shift - SCST_DIF_TAG_SHIFT);
TRACE_DBG("DIF adjust_len %d, must_left %d", adjust_len, must_left);
res = __scst_adjust_sg_get_tail(cmd, cmd->dif_sg, &cmd->dif_sg_cnt,
res_dif_sg, res_dif_sg_cnt, adjust_len,
&cmd->orig_dif_sg, must_left);
if (res != 0) {
scst_restore_sg_buff(cmd);
goto out;
}
cmd->dif_sg_buff_modified = 1;
}
out:
TRACE_EXIT_RES(res);
return res;
}
/*
* scst_restore_sg_buff() - restores modified sg buffer
*
* Restores modified sg buffer in the original state.
*/
void scst_restore_sg_buff(struct scst_cmd *cmd)
{
TRACE_DBG_FLAG(TRACE_DEBUG|TRACE_MEMORY, "cmd %p, sg %p, DATA: "
"orig_sg_entry %p, orig_entry_offs %d, orig_entry_len %d, "
"orig_sg_cnt %d, DIF: orig_sg_entry %p, "
"orig_entry_offs %d, orig_entry_len %d, orig_sg_cnt %d", cmd,
cmd->sg, cmd->orig_sg.orig_sg_entry, cmd->orig_sg.orig_entry_offs,
cmd->orig_sg.orig_entry_len, cmd->orig_sg.orig_sg_cnt,
cmd->orig_dif_sg.orig_sg_entry, cmd->orig_dif_sg.orig_entry_offs,
cmd->orig_dif_sg.orig_entry_len, cmd->orig_dif_sg.orig_sg_cnt);
EXTRACHECKS_BUG_ON(!(cmd->sg_buff_modified || cmd->dif_sg_buff_modified));
if (cmd->sg_buff_modified) {
cmd->orig_sg.orig_sg_entry->offset = cmd->orig_sg.orig_entry_offs;
cmd->orig_sg.orig_sg_entry->length = cmd->orig_sg.orig_entry_len;
*cmd->orig_sg.p_orig_sg_cnt = cmd->orig_sg.orig_sg_cnt;
}
if (cmd->dif_sg_buff_modified) {
cmd->orig_dif_sg.orig_sg_entry->offset = cmd->orig_dif_sg.orig_entry_offs;
cmd->orig_dif_sg.orig_sg_entry->length = cmd->orig_dif_sg.orig_entry_len;
*cmd->orig_dif_sg.p_orig_sg_cnt = cmd->orig_dif_sg.orig_sg_cnt;
}
cmd->sg_buff_modified = 0;
cmd->dif_sg_buff_modified = 0;
}
EXPORT_SYMBOL(scst_restore_sg_buff);
/*
* scst_set_resp_data_len() - set response data length
*
* Sets response data length for cmd and truncates its SG vector accordingly.
*
* The cmd->resp_data_len must not be set directly, it must be set only
* using this function. Value of resp_data_len must be <= cmd->bufflen.
*/
void scst_set_resp_data_len(struct scst_cmd *cmd, int resp_data_len)
{
TRACE_ENTRY();
scst_check_restore_sg_buff(cmd);
cmd->resp_data_len = resp_data_len;
if (resp_data_len == cmd->bufflen)
goto out;
TRACE_DBG("cmd %p, resp_data_len %d", cmd, resp_data_len);
if (unlikely(resp_data_len > cmd->bufflen)) {
PRINT_ERROR("Too big response data len %d (max %d), limiting "
"it to the max (dev %s)", resp_data_len, cmd->bufflen,
cmd->dev ? cmd->dev->virt_name : "(no LUN)");
/*
* It's a bug in the lower level code, so dump stack to know
* who is the cause
*/
dump_stack();
cmd->resp_data_len = cmd->bufflen;
goto out;
}
scst_adjust_sg(cmd, true, resp_data_len);
cmd->resid_possible = 1;
out:
TRACE_EXIT();
return;
}
EXPORT_SYMBOL_GPL(scst_set_resp_data_len);
void scst_limit_sg_write_len(struct scst_cmd *cmd)
{
TRACE_ENTRY();
TRACE_MEM("Limiting sg write len to %d (cmd %p, sg %p, sg_cnt %d)",
cmd->write_len, cmd, *cmd->write_sg, *cmd->write_sg_cnt);
scst_check_restore_sg_buff(cmd);
scst_adjust_sg(cmd, false, cmd->write_len);
TRACE_EXIT();
return;
}
static int scst_full_len_to_data_len(u32 full_len, u32 block_shift)
{
u64 res;
u32 rem;
res = (u64)full_len << block_shift;
rem = do_div(res, (1 << block_shift) + (1 << SCST_DIF_TAG_SHIFT));
if (unlikely(rem != 0))
TRACE(TRACE_MINOR, "Reminder %d for full len! (full len%d)",
rem, full_len);
TRACE_DBG("data len %lld (full %d)", res, full_len);
return res;
}
/*
* Returns data expected transfer length, i.e. expected transfer length,
* adjusted on DIF tags expected transfer length, if any.
*
* Very expensive, don't call on fast path!
*/
int scst_cmd_get_expected_transfer_len_data(struct scst_cmd *cmd)
{
u64 res;
u32 rem;
if (!cmd->tgt_dif_data_expected)
return cmd->expected_transfer_len_full;
res = (u64)cmd->expected_transfer_len_full << cmd->dev->block_shift;
rem = do_div(res, cmd->dev->block_size + (1 << SCST_DIF_TAG_SHIFT));
if (unlikely(rem != 0))
TRACE(TRACE_MINOR, "Reminder %d for expected transfer len "
"data! (cmd %p, op %s, expected len full %d)", rem,
cmd, scst_get_opcode_name(cmd),
cmd->expected_transfer_len_full);
TRACE_DBG("Expected transfer len data %lld (cmd %p)", res, cmd);
return res;
}
/*
* Returns DIF tags expected transfer length.
*
* Very expensive, don't call on fast path!
*/
int scst_cmd_get_expected_transfer_len_dif(struct scst_cmd *cmd)
{
u64 res;
u32 rem;
if (!cmd->tgt_dif_data_expected)
return 0;
res = (u64)cmd->expected_transfer_len_full << SCST_DIF_TAG_SHIFT;
rem = do_div(res, cmd->dev->block_size + (1 << SCST_DIF_TAG_SHIFT));
if (unlikely(rem != 0))
TRACE(TRACE_MINOR, "Reminder %d for expected transfer len dif! "
"(cmd %p, op %s, expected len full %d)", rem, cmd,
scst_get_opcode_name(cmd), cmd->expected_transfer_len_full);
TRACE_DBG("Expected transfer len DIF %lld (cmd %p)", res, cmd);
return res;
}
void scst_adjust_resp_data_len(struct scst_cmd *cmd)
{
TRACE_ENTRY();
if (!cmd->expected_values_set) {
cmd->adjusted_resp_data_len = cmd->resp_data_len;
goto out;
}
cmd->adjusted_resp_data_len = min(cmd->resp_data_len,
scst_cmd_get_expected_transfer_len_data(cmd));
if (cmd->adjusted_resp_data_len != cmd->resp_data_len) {
TRACE_MEM("Adjusting resp_data_len to %d (cmd %p, sg %p, "
"sg_cnt %d)", cmd->adjusted_resp_data_len, cmd, cmd->sg,
cmd->sg_cnt);
scst_check_restore_sg_buff(cmd);
scst_adjust_sg(cmd, true, cmd->adjusted_resp_data_len);
}
out:
TRACE_EXIT();
return;
}
/*
* scst_cmd_set_write_not_received_data_len() - sets cmd's not received len
*
* Sets cmd's not received data length. Also automatically sets resid_possible.
*/
void scst_cmd_set_write_not_received_data_len(struct scst_cmd *cmd,
int not_received)
{
TRACE_ENTRY();
cmd->write_not_received_set = 1;
if (!cmd->expected_values_set) {
/*
* No expected values set, so no residuals processing.
* It can happen if a command preliminary completed before
* target driver had a chance to set expected values.
*/
TRACE_MGMT_DBG("No expected values set, ignoring (cmd %p)", cmd);
goto out;
}
cmd->resid_possible = 1;
if ((cmd->expected_data_direction & SCST_DATA_READ) &&
(cmd->expected_data_direction & SCST_DATA_WRITE)) {
cmd->write_len = cmd->expected_out_transfer_len - not_received;
if (cmd->write_len == cmd->out_bufflen)
goto out;
} else if (cmd->expected_data_direction & SCST_DATA_WRITE) {
cmd->write_len = cmd->expected_transfer_len_full - not_received;
if (cmd->tgt_dif_data_expected)
cmd->write_len = scst_full_len_to_data_len(cmd->write_len,
cmd->dev->block_shift);
if (cmd->write_len == cmd->bufflen)
goto out;
}
/*
* Write len now can be bigger cmd->(out_)bufflen, but that's OK,
* because it will be used to only calculate write residuals.
*/
TRACE_DBG("cmd %p, not_received %d, write_len %d", cmd, not_received,
cmd->write_len);
if (cmd->data_direction & SCST_DATA_WRITE)
scst_limit_sg_write_len(cmd);
out:
TRACE_EXIT();
return;
}
EXPORT_SYMBOL(scst_cmd_set_write_not_received_data_len);
void scst_cmd_set_write_no_data_received(struct scst_cmd *cmd)
{
int w;
TRACE_ENTRY();
EXTRACHECKS_BUG_ON(cmd->expected_values_set &&
((cmd->expected_data_direction & SCST_DATA_WRITE) == 0));
if ((cmd->expected_data_direction & SCST_DATA_READ) &&
(cmd->expected_data_direction & SCST_DATA_WRITE))
w = cmd->expected_out_transfer_len;
else
w = cmd->expected_transfer_len_full;
scst_cmd_set_write_not_received_data_len(cmd, w);
TRACE_EXIT();
return;
}
/*
* __scst_get_resid() - returns residuals for cmd
*
* Returns residuals for command. Must not be called directly, use
* scst_get_resid() instead.
*/
bool __scst_get_resid(struct scst_cmd *cmd, int *resid, int *bidi_out_resid)
{
bool res;
TRACE_ENTRY();
*resid = 0;
if (bidi_out_resid != NULL)
*bidi_out_resid = 0;
if (!cmd->expected_values_set) {
/*
* No expected values set, so no residuals processing.
* It can happen if a command preliminary completed before
* target driver had a chance to set expected values.
*/
TRACE_MGMT_DBG("No expected values set, returning no residual "
"(cmd %p)", cmd);
res = false;
goto out;
}
if (cmd->expected_data_direction & SCST_DATA_READ) {
int resp = cmd->resp_data_len;
if (cmd->tgt_dif_data_expected)
resp += (resp >> cmd->dev->block_shift) << SCST_DIF_TAG_SHIFT;
*resid = cmd->expected_transfer_len_full - resp;
if ((cmd->expected_data_direction & SCST_DATA_WRITE) && bidi_out_resid) {
if (cmd->write_len < cmd->expected_out_transfer_len)
*bidi_out_resid = cmd->expected_out_transfer_len -
cmd->write_len;
else
*bidi_out_resid = cmd->write_len - cmd->out_bufflen;
}
} else if (cmd->expected_data_direction & SCST_DATA_WRITE) {
int wl = cmd->write_len;
if (cmd->tgt_dif_data_expected)
wl += (wl >> cmd->dev->block_shift) << SCST_DIF_TAG_SHIFT;
if (wl < cmd->expected_transfer_len_full)
*resid = cmd->expected_transfer_len_full - wl;
else {
*resid = cmd->write_len - cmd->bufflen;
if (cmd->tgt_dif_data_expected) {
int r = *resid;
if (r < 0)
r = -r;
r += (r >> cmd->dev->block_shift) << SCST_DIF_TAG_SHIFT;
if (*resid > 0)
*resid = r;
else
*resid = -r;
}
}
}
res = true;
TRACE_DBG("cmd %p, resid %d, bidi_out_resid %d (resp_data_len %d, "
"expected_data_direction %d, write_len %d, bufflen %d, "
"tgt_dif_data_expected %d)", cmd, *resid,
bidi_out_resid ? *bidi_out_resid : 0, cmd->resp_data_len,
cmd->expected_data_direction, cmd->write_len, cmd->bufflen,
cmd->tgt_dif_data_expected);
out:
TRACE_EXIT_RES(res);
return res;
}
EXPORT_SYMBOL(__scst_get_resid);
/* No locks */
void scst_queue_retry_cmd(struct scst_cmd *cmd)
{
struct scst_tgt *tgt = cmd->tgt;
unsigned long flags;
TRACE_ENTRY();
spin_lock_irqsave(&tgt->tgt_lock, flags);
tgt->retry_cmds++;
TRACE_RETRY("Adding cmd %p to retry cmd list", cmd);
list_add_tail(&cmd->cmd_list_entry, &tgt->retry_cmd_list);
if (!tgt->retry_timer_active) {
TRACE_DBG("Activating retry timer for tgt %p", tgt);
tgt->retry_timer.expires = jiffies + SCST_TGT_RETRY_TIMEOUT;
add_timer(&tgt->retry_timer);
tgt->retry_timer_active = 1;
}
spin_unlock_irqrestore(&tgt->tgt_lock, flags);
TRACE_EXIT();
return;
}
/*
* scst_update_hw_pending_start() - update commands pending start
*
* Updates the command's hw_pending_start as if it's just started hw pending.
* Target drivers should call it if they received reply from this pending
* command, but SCST core won't see it.
*/
void scst_update_hw_pending_start(struct scst_cmd *cmd)
{
unsigned long flags;
TRACE_ENTRY();
/* To sync with scst_check_hw_pending_cmd() */
spin_lock_irqsave(&cmd->sess->sess_list_lock, flags);
cmd->hw_pending_start = jiffies;
TRACE_MGMT_DBG("Updated hw_pending_start to %ld (cmd %p)",
cmd->hw_pending_start, cmd);
spin_unlock_irqrestore(&cmd->sess->sess_list_lock, flags);
TRACE_EXIT();
return;
}
EXPORT_SYMBOL_GPL(scst_update_hw_pending_start);
/*
* Supposed to be called under sess_list_lock, but can release/reacquire it.
* Returns 0 to continue, >0 to restart, <0 to break.
*/
static int scst_check_hw_pending_cmd(struct scst_cmd *cmd,
unsigned long cur_time, unsigned long max_time,
struct scst_session *sess, unsigned long *flags,
struct scst_tgt_template *tgtt)
{
int res = -1; /* break */
TRACE_DBG("cmd %p, hw_pending %d, proc time %ld, "
"pending time %ld", cmd, cmd->cmd_hw_pending,
(long)(cur_time - cmd->start_time) / HZ,
(long)(cur_time - cmd->hw_pending_start) / HZ);
if (time_before(cur_time, cmd->start_time + max_time)) {
/* Cmds are ordered, so no need to check more */
goto out;
}
if (!cmd->cmd_hw_pending) {
res = 0; /* continue */
goto out;
}
if (time_before(cur_time, cmd->hw_pending_start + max_time)) {
res = 0; /* continue */
goto out;
}
TRACE(TRACE_MGMT, "Cmd %p HW pending for too long %ld (state %x)",
cmd, (cur_time - cmd->hw_pending_start) / HZ,
cmd->state);
cmd->cmd_hw_pending = 0;
spin_unlock_irqrestore(&sess->sess_list_lock, *flags);
tgtt->on_hw_pending_cmd_timeout(cmd);
spin_lock_irqsave(&sess->sess_list_lock, *flags);
res = 1; /* restart */
out:
TRACE_EXIT_RES(res);
return res;
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20)
static void scst_hw_pending_work_fn(void *p)
#else
static void scst_hw_pending_work_fn(struct work_struct *work)
#endif
{
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20)
struct scst_session *sess = (struct scst_session *)p;
#else
struct scst_session *sess = container_of(work, struct scst_session,
hw_pending_work.work);
#endif
struct scst_tgt_template *tgtt = sess->tgt->tgtt;
struct scst_cmd *cmd;
unsigned long cur_time = jiffies;
unsigned long flags;
unsigned long max_time = tgtt->max_hw_pending_time * HZ;
TRACE_ENTRY();
TRACE_DBG("HW pending work (sess %p, max time %ld)", sess, max_time/HZ);
clear_bit(SCST_SESS_HW_PENDING_WORK_SCHEDULED, &sess->sess_aflags);
spin_lock_irqsave(&sess->sess_list_lock, flags);
restart:
list_for_each_entry(cmd, &sess->sess_cmd_list, sess_cmd_list_entry) {
int rc;
rc = scst_check_hw_pending_cmd(cmd, cur_time, max_time, sess,
&flags, tgtt);
if (rc < 0)
break;
else if (rc == 0)
continue;
else
goto restart;
}
if (!list_empty(&sess->sess_cmd_list)) {
/*
* For stuck cmds if there is no activity we might need to have
* one more run to release them, so reschedule once again.
*/
TRACE_DBG("Sched HW pending work for sess %p (max time %d)",
sess, tgtt->max_hw_pending_time);
set_bit(SCST_SESS_HW_PENDING_WORK_SCHEDULED, &sess->sess_aflags);
schedule_delayed_work(&sess->hw_pending_work,
tgtt->max_hw_pending_time * HZ);
}
spin_unlock_irqrestore(&sess->sess_list_lock, flags);
TRACE_EXIT();
return;
}
static bool __scst_is_relative_target_port_id_unique(uint16_t id,
const struct scst_tgt *t)
{
bool res = true;
struct scst_tgt_template *tgtt;
TRACE_ENTRY();
list_for_each_entry(tgtt, &scst_template_list,
scst_template_list_entry) {
struct scst_tgt *tgt;
list_for_each_entry(tgt, &tgtt->tgt_list, tgt_list_entry) {
if (tgt == t)
continue;
if ((tgt->tgtt->is_target_enabled != NULL) &&
!tgt->tgtt->is_target_enabled(tgt))
continue;
if (id == tgt->rel_tgt_id) {
res = false;
break;
}
}
}
TRACE_EXIT_RES(res);
return res;
}
/* scst_mutex supposed to be locked */
bool scst_is_relative_target_port_id_unique(uint16_t id,
const struct scst_tgt *t)
{
bool res;
TRACE_ENTRY();
mutex_lock(&scst_mutex);
res = __scst_is_relative_target_port_id_unique(id, t);
mutex_unlock(&scst_mutex);
TRACE_EXIT_RES(res);
return res;
}
int gen_relative_target_port_id(uint16_t *id)
{
int res = -EOVERFLOW;
static unsigned long rti = SCST_MIN_REL_TGT_ID, rti_prev;
TRACE_ENTRY();
res = mutex_lock_interruptible(&scst_mutex);
if (res != 0)
goto out;
rti_prev = rti;
do {
if (__scst_is_relative_target_port_id_unique(rti, NULL)) {
*id = (uint16_t)rti++;
res = 0;
goto out_unlock;
}
rti++;
if (rti > SCST_MAX_REL_TGT_ID)
rti = SCST_MIN_REL_TGT_ID;
} while (rti != rti_prev);
PRINT_ERROR("%s", "Unable to create unique relative target port id");
out_unlock:
mutex_unlock(&scst_mutex);
out:
TRACE_EXIT_RES(res);
return res;
}
/* No locks */
int scst_alloc_tgt(struct scst_tgt_template *tgtt, struct scst_tgt **tgt)
{
struct scst_tgt *t;
int res = 0;
TRACE_ENTRY();
t = kmem_cache_zalloc(scst_tgt_cachep, GFP_KERNEL);
if (t == NULL) {
PRINT_ERROR("%s", "Allocation of tgt failed");
res = -ENOMEM;
goto out;
}
INIT_LIST_HEAD(&t->sess_list);
INIT_LIST_HEAD(&t->sysfs_sess_list);
init_waitqueue_head(&t->unreg_waitQ);
t->tgtt = tgtt;
t->sg_tablesize = tgtt->sg_tablesize;
t->tgt_dif_supported = tgtt->dif_supported;
t->tgt_hw_dif_type1_supported = tgtt->hw_dif_type1_supported;
t->tgt_hw_dif_type2_supported = tgtt->hw_dif_type2_supported;
t->tgt_hw_dif_type3_supported = tgtt->hw_dif_type3_supported;
t->tgt_hw_dif_ip_supported = tgtt->hw_dif_ip_supported;
t->tgt_hw_dif_same_sg_layout_required = tgtt->hw_dif_same_sg_layout_required;
t->tgt_supported_dif_block_sizes = tgtt->supported_dif_block_sizes;
spin_lock_init(&t->tgt_lock);
INIT_LIST_HEAD(&t->retry_cmd_list);
timer_setup(&t->retry_timer, scst_tgt_retry_timer_fn, 0);
atomic_set(&t->tgt_dif_app_failed_tgt, 0);
atomic_set(&t->tgt_dif_ref_failed_tgt, 0);
atomic_set(&t->tgt_dif_guard_failed_tgt, 0);
atomic_set(&t->tgt_dif_app_failed_scst, 0);
atomic_set(&t->tgt_dif_ref_failed_scst, 0);
atomic_set(&t->tgt_dif_guard_failed_scst, 0);
atomic_set(&t->tgt_dif_app_failed_dev, 0);
atomic_set(&t->tgt_dif_ref_failed_dev, 0);
atomic_set(&t->tgt_dif_guard_failed_dev, 0);
INIT_LIST_HEAD(&t->tgt_acg_list);
*tgt = t;
out:
TRACE_EXIT_HRES(res);
return res;
}
/* No locks */
void scst_free_tgt(struct scst_tgt *tgt)
{
TRACE_ENTRY();
kfree(tgt->tgt_name);
kfree(tgt->tgt_comment);
kmem_cache_free(scst_tgt_cachep, tgt);
TRACE_EXIT();
return;
}
static void scst_init_order_data(struct scst_order_data *order_data)
{
int i;
spin_lock_init(&order_data->sn_lock);
INIT_LIST_HEAD(&order_data->deferred_cmd_list);
INIT_LIST_HEAD(&order_data->skipped_sn_list);
order_data->curr_sn = (typeof(order_data->curr_sn))(-20);
order_data->expected_sn = order_data->curr_sn;
order_data->cur_sn_slot = &order_data->sn_slots[0];
for (i = 0; i < ARRAY_SIZE(order_data->sn_slots); i++)
atomic_set(&order_data->sn_slots[i], 0);
spin_lock_init(&order_data->init_done_lock);
return;
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20)
static void scst_ext_blocking_done_fn(void *p);
#else
static void scst_ext_blocking_done_fn(struct work_struct *work);
#endif
static int scst_dif_none(struct scst_cmd *cmd);
#ifdef CONFIG_SCST_DIF_INJECT_CORRUPTED_TAGS
static int scst_dif_none_type1(struct scst_cmd *cmd);
#else
#define scst_dif_none_type1 scst_dif_none
#endif
/* Called from thread context and hence may sleep. */
void scst_free_device(struct scst_device *dev)
{
EXTRACHECKS_BUG_ON(dev->dev_scsi_atomic_cmd_active != 0);
EXTRACHECKS_BUG_ON(!list_empty(&dev->dev_exec_cmd_list));
#ifdef CONFIG_SCST_EXTRACHECKS
if (!list_empty(&dev->dev_tgt_dev_list) ||
!list_empty(&dev->dev_acg_dev_list)) {
PRINT_CRIT_ERROR("%s: dev_tgt_dev_list or dev_acg_dev_list "
"is not empty!", __func__);
sBUG();
}
#endif
/* Ensure that ext_blockers_work is done */
flush_work(&dev->ext_blockers_work);
scst_deinit_threads(&dev->dev_cmd_threads);
scst_pr_cleanup(dev);
lockdep_unregister_key(&dev->dev_lock_key);
kfree(dev->virt_name);
percpu_ref_exit(&dev->refcnt);
kmem_cache_free(scst_dev_cachep, dev);
}
/* RCU callback. Must not sleep. */
static void scst_release_device(struct percpu_ref *ref)
{
struct scst_device *dev = container_of(ref, typeof(*dev), refcnt);
struct completion *c = dev->remove_completion;
if (c)
complete(c);
}
int scst_alloc_device(gfp_t gfp_mask, int nodeid, struct scst_device **out_dev)
{
struct scst_device *dev;
int res = 0;
TRACE_ENTRY();
lockdep_assert_held(&scst_mutex);
dev = kmem_cache_alloc_node(scst_dev_cachep, gfp_mask, nodeid);
if (dev == NULL) {
PRINT_ERROR("%s", "Allocation of scst_device failed");
res = -ENOMEM;
goto out;
}
memset(dev, 0, sizeof(*dev));
dev->handler = &scst_null_devtype;
res = percpu_ref_init(&dev->refcnt, scst_release_device, 0, GFP_KERNEL);
if (res < 0)
goto free_dev;
#ifdef CONFIG_SCST_PER_DEVICE_CMD_COUNT_LIMIT
atomic_set(&dev->dev_cmd_count, 0);
#endif
scst_init_mem_lim(&dev->dev_mem_lim);
spin_lock_init(&dev->dev_lock);
lockdep_register_key(&dev->dev_lock_key);
lockdep_set_class(&dev->dev_lock, &dev->dev_lock_key);
INIT_LIST_HEAD(&dev->dev_exec_cmd_list);
INIT_LIST_HEAD(&dev->blocked_cmd_list);
INIT_LIST_HEAD(&dev->dev_tgt_dev_list);
INIT_LIST_HEAD(&dev->dev_acg_dev_list);
INIT_LIST_HEAD(&dev->ext_blockers_list);
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20)
INIT_WORK(&dev->ext_blockers_work, scst_ext_blocking_done_fn, dev);
#else
INIT_WORK(&dev->ext_blockers_work, scst_ext_blocking_done_fn);
#endif
dev->dev_double_ua_possible = 1;
dev->queue_alg = SCST_QUEUE_ALG_1_UNRESTRICTED_REORDER;
dev->dev_numa_node_id = nodeid;
scst_pr_init(dev);
BUILD_BUG_ON(SCST_DIF_NO_CHECK_APP_TAG != 0);
dev->dev_dif_static_app_tag = SCST_DIF_NO_CHECK_APP_TAG;
dev->dev_dif_static_app_ref_tag = SCST_DIF_NO_CHECK_APP_TAG;
dev->dev_dif_fn = scst_dif_none;
scst_init_order_data(&dev->dev_order_data);
scst_init_threads(&dev->dev_cmd_threads);
*out_dev = dev;
out:
TRACE_EXIT_RES(res);
return res;
free_dev:
kmem_cache_free(scst_dev_cachep, dev);
goto out;
}
bool scst_device_is_exported(struct scst_device *dev)
{
lockdep_assert_held(&scst_mutex);
WARN_ON_ONCE(!dev->dev_tgt_dev_list.next);
return !list_empty(&dev->dev_tgt_dev_list);
}
/*
* scst_init_mem_lim - initialize memory limits structure
*
* Initializes memory limits structure mem_lim according to
* the current system configuration. This structure should be latter used
* to track and limit allocated by one or more SGV pools memory.
*/
void scst_init_mem_lim(struct scst_mem_lim *mem_lim)
{
atomic_set(&mem_lim->alloced_pages, 0);
mem_lim->max_allowed_pages =
((uint64_t)scst_max_dev_cmd_mem << 10) >> (PAGE_SHIFT - 10);
}
EXPORT_SYMBOL_GPL(scst_init_mem_lim);
static struct scst_acg_dev *scst_alloc_acg_dev(struct scst_acg *acg,
struct scst_device *dev, uint64_t lun)
{
struct scst_acg_dev *res;
TRACE_ENTRY();
res = kmem_cache_zalloc(scst_acgd_cachep, GFP_KERNEL);
if (res == NULL) {
PRINT_ERROR("%s", "Allocation of scst_acg_dev failed");
goto out;
}
res->dev = dev;
res->acg = acg;
res->lun = lun;
percpu_ref_get(&dev->refcnt);
out:
TRACE_EXIT_HRES(res);
return res;
}
/*
* The activity supposed to be suspended and scst_mutex held or the
* corresponding target supposed to be stopped.
*/
static void scst_del_acg_dev(struct scst_acg_dev *acg_dev,
bool del_acg_dev_list, bool del_sysfs)
{
TRACE_DBG("Removing acg_dev %p from dev_acg_dev_list", acg_dev);
list_del(&acg_dev->dev_acg_dev_list_entry);
if (del_acg_dev_list) {
TRACE_DBG("Removing acg_dev %p from acg_dev_list", acg_dev);
list_del(&acg_dev->acg_dev_list_entry);
}
if (del_sysfs)
scst_acg_dev_sysfs_del(acg_dev);
}
/*
* The activity supposed to be suspended and scst_mutex held or the
* corresponding target supposed to be stopped.
*/
static void scst_free_acg_dev(struct scst_acg_dev *acg_dev)
{
percpu_ref_put(&acg_dev->dev->refcnt);
kmem_cache_free(scst_acgd_cachep, acg_dev);
}
/*
* The activity supposed to be suspended and scst_mutex held or the
* corresponding target supposed to be stopped.
*/
static void scst_del_free_acg_dev(struct scst_acg_dev *acg_dev, bool del_sysfs)
{
TRACE_ENTRY();
scst_del_acg_dev(acg_dev, true, del_sysfs);
scst_free_acg_dev(acg_dev);
TRACE_EXIT();
return;
}
static int scst_check_dif_compatibility(const struct scst_acg *acg,
const struct scst_device *dev)
{
int res = -EINVAL;
struct scst_tgt *tgt;
const int *p;
bool supported;
TRACE_ENTRY();
if (dev->dev_dif_mode == SCST_DIF_MODE_NONE)
goto out_ok;
tgt = acg->tgt;
if (!tgt->tgt_dif_supported) {
PRINT_ERROR("Target %s doesn't support T10-PI (device %s)",
tgt->tgt_name, dev->virt_name);
goto out;
}
if (dev->dev_dif_mode & SCST_DIF_MODE_TGT) {
if ((dev->dev_dif_type == 1) && !tgt->tgt_hw_dif_type1_supported) {
PRINT_ERROR("Target %s doesn't support type 1 "
"protection TGT mode (device %s)", tgt->tgt_name,
dev->virt_name);
goto out;
}
if ((dev->dev_dif_type == 2) && !tgt->tgt_hw_dif_type2_supported) {
PRINT_ERROR("Target %s doesn't support type 2 "
"protection TGT mode (device %s)", tgt->tgt_name,
dev->virt_name);
goto out;
}
if ((dev->dev_dif_type == 3) && !tgt->tgt_hw_dif_type3_supported) {
PRINT_ERROR("Target %s doesn't support type 3 "
"protection TGT mode (device %s)", tgt->tgt_name,
dev->virt_name);
goto out;
}
}
if (tgt->tgt_supported_dif_block_sizes == NULL)
goto out_ok;
p = tgt->tgt_supported_dif_block_sizes;
supported = false;
while (*p != 0) {
if (*p == dev->block_size) {
supported = true;
break;
}
p++;
}
if (!supported) {
PRINT_ERROR("Target %s doesn't support block size %d of "
"device %s", tgt->tgt_name, dev->block_size, dev->virt_name);
goto out;
}
out_ok:
res = 0;
out:
TRACE_EXIT_RES(res);
return res;
}
/* The activity supposed to be suspended and scst_mutex held */
int scst_acg_add_lun(struct scst_acg *acg, struct kobject *parent,
struct scst_device *dev, uint64_t lun, unsigned int flags,
struct scst_acg_dev **out_acg_dev)
{
int res;
struct scst_acg_dev *acg_dev;
struct scst_tgt_dev *tgt_dev, *tt;
struct scst_session *sess;
LIST_HEAD(tmp_tgt_dev_list);
TRACE_ENTRY();
INIT_LIST_HEAD(&tmp_tgt_dev_list);
res = scst_check_dif_compatibility(acg, dev);
if (res != 0)
goto out;
acg_dev = scst_alloc_acg_dev(acg, dev, lun);
if (acg_dev == NULL) {
res = -ENOMEM;
goto out;
}
acg_dev->acg_dev_rd_only = ((flags & SCST_ADD_LUN_READ_ONLY) != 0);
if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_STORE) {
/* Devices are allowed to store only CRCs */
acg_dev->acg_dev_dif_guard_format = SCST_DIF_GUARD_FORMAT_CRC;
} else
acg_dev->acg_dev_dif_guard_format =
acg->tgt->tgt_hw_dif_ip_supported && !dev->dev_dif_ip_not_supported ?
SCST_DIF_GUARD_FORMAT_IP :
SCST_DIF_GUARD_FORMAT_CRC;
TRACE_DBG("Adding acg_dev %p to acg_dev_list and dev_acg_dev_list",
acg_dev);
list_add_tail(&acg_dev->acg_dev_list_entry, &acg->acg_dev_list);
list_add_tail(&acg_dev->dev_acg_dev_list_entry, &dev->dev_acg_dev_list);
if (!(flags & SCST_ADD_LUN_CM)) {
res = scst_cm_on_add_lun(acg_dev, lun, &flags);
if (res != 0)
goto out_free;
}
list_for_each_entry(sess, &acg->acg_sess_list, acg_sess_list_entry) {
res = scst_alloc_add_tgt_dev(sess, acg_dev, &tgt_dev);
if (res == -EPERM)
continue;
else if (res != 0)
goto out_free;
list_add_tail(&tgt_dev->extra_tgt_dev_list_entry,
&tmp_tgt_dev_list);
}
res = scst_acg_dev_sysfs_create(acg_dev, parent);
if (res != 0)
goto out_on_del;
if (flags & SCST_ADD_LUN_GEN_UA)
scst_report_luns_changed(acg);
PRINT_INFO("Added device %s to group %s (LUN %lld, "
"flags 0x%x) to target %s", dev->virt_name, acg->acg_name,
lun, flags, acg->tgt ? acg->tgt->tgt_name : "?");
if (out_acg_dev != NULL)
*out_acg_dev = acg_dev;
out:
TRACE_EXIT_RES(res);
return res;
out_on_del:
if (!(flags & SCST_ADD_LUN_CM))
scst_cm_on_del_lun(acg_dev, false);
out_free:
/*
* synchronize_rcu() does not have to be called here because the
* tgt_devs that will be freed have never been on any of the
* sess->sess_tgt_dev_list[] lists.
*/
list_for_each_entry_safe(tgt_dev, tt, &tmp_tgt_dev_list,
extra_tgt_dev_list_entry) {
scst_free_tgt_dev(tgt_dev);
}
scst_del_free_acg_dev(acg_dev, false);
goto out;
}
/* Delete a LUN without generating a unit attention. */
static struct scst_acg_dev *__scst_acg_del_lun(struct scst_acg *acg,
uint64_t lun,
struct list_head *tgt_dev_list,
bool *report_luns_changed)
{
struct scst_acg_dev *acg_dev = NULL, *a;
struct scst_tgt_dev *tgt_dev, *tt;
struct scst_session *sess;
lockdep_assert_held(&scst_mutex);
INIT_LIST_HEAD(tgt_dev_list);
list_for_each_entry(a, &acg->acg_dev_list, acg_dev_list_entry) {
if (a->lun == lun) {
acg_dev = a;
break;
}
}
if (acg_dev == NULL)
goto out;
*report_luns_changed = scst_cm_on_del_lun(acg_dev,
*report_luns_changed);
list_for_each_entry_safe(tgt_dev, tt, &acg_dev->dev->dev_tgt_dev_list,
dev_tgt_dev_list_entry) {
if (tgt_dev->acg_dev == acg_dev) {
sess = tgt_dev->sess;
mutex_lock(&sess->tgt_dev_list_mutex);
scst_del_tgt_dev(tgt_dev);
mutex_unlock(&sess->tgt_dev_list_mutex);
list_add_tail(&tgt_dev->extra_tgt_dev_list_entry,
tgt_dev_list);
}
}
scst_del_acg_dev(acg_dev, true, true);
PRINT_INFO("Removed LUN %lld from group %s (target %s)",
lun, acg->acg_name, acg->tgt ? acg->tgt->tgt_name : "?");
out:
return acg_dev;
}
static int scst_tgt_devs_cmds(struct list_head *tgt_dev_list)
{
struct scst_tgt_dev *tgt_dev;
int res = 0;
list_for_each_entry(tgt_dev, tgt_dev_list, extra_tgt_dev_list_entry)
res += atomic_read(&tgt_dev->tgt_dev_cmd_count);
return res;
}
static void scst_wait_for_tgt_devs(struct list_head *tgt_dev_list)
{
while (scst_tgt_devs_cmds(tgt_dev_list) > 0)
msleep(100);
}
int scst_acg_del_lun(struct scst_acg *acg, uint64_t lun,
bool gen_report_luns_changed)
{
int res = 0;
struct scst_acg_dev *acg_dev;
struct scst_tgt_dev *tgt_dev, *tt;
struct list_head tgt_dev_list;
TRACE_ENTRY();
lockdep_assert_held(&scst_mutex);
acg_dev = __scst_acg_del_lun(acg, lun, &tgt_dev_list,
&gen_report_luns_changed);
if (acg_dev == NULL) {
PRINT_ERROR("Device is not found in group %s", acg->acg_name);
res = -EINVAL;
goto out;
}
if (gen_report_luns_changed)
scst_report_luns_changed(acg);
mutex_unlock(&scst_mutex);
scst_wait_for_tgt_devs(&tgt_dev_list);
synchronize_rcu();
mutex_lock(&scst_mutex);
list_for_each_entry_safe(tgt_dev, tt, &tgt_dev_list,
extra_tgt_dev_list_entry) {
scst_free_tgt_dev(tgt_dev);
}
scst_free_acg_dev(acg_dev);
out:
TRACE_EXIT_RES(res);
return res;
}
/* Either add or replace a LUN according to flags argument */
int scst_acg_repl_lun(struct scst_acg *acg, struct kobject *parent,
struct scst_device *dev, uint64_t lun,
unsigned int flags)
{
struct scst_acg_dev *acg_dev;
bool del_gen_ua = false;
struct scst_tgt_dev *tgt_dev, *tt;
struct list_head tgt_dev_list;
int res = -EINVAL;
lockdep_assert_held(&scst_mutex);
acg_dev = __scst_acg_del_lun(acg, lun, &tgt_dev_list, &del_gen_ua);
if (!acg_dev)
flags |= SCST_ADD_LUN_GEN_UA;
res = scst_acg_add_lun(acg, parent, dev, lun, flags, NULL);
if (res != 0)
goto out;
if (acg_dev && (flags & SCST_REPL_LUN_GEN_UA)) {
list_for_each_entry(tgt_dev, &dev->dev_tgt_dev_list,
dev_tgt_dev_list_entry) {
if (tgt_dev->acg_dev->acg == acg &&
tgt_dev->lun == lun) {
TRACE_MGMT_DBG("INQUIRY DATA HAS CHANGED"
" on tgt_dev %p", tgt_dev);
scst_gen_aen_or_ua(tgt_dev,
SCST_LOAD_SENSE(scst_sense_inquiry_data_changed));
}
}
}
mutex_unlock(&scst_mutex);
scst_wait_for_tgt_devs(&tgt_dev_list);
synchronize_rcu();
mutex_lock(&scst_mutex);
list_for_each_entry_safe(tgt_dev, tt, &tgt_dev_list,
extra_tgt_dev_list_entry) {
scst_free_tgt_dev(tgt_dev);
}
if (acg_dev)
scst_free_acg_dev(acg_dev);
out:
return res;
}
int scst_alloc_add_acg(struct scst_tgt *tgt, const char *acg_name,
bool tgt_acg, struct scst_acg **out_acg)
{
struct scst_acg *acg;
int res;
TRACE_ENTRY();
lockdep_assert_held(&scst_mutex);
acg = kzalloc(sizeof(*acg), GFP_KERNEL);
if (acg == NULL) {
PRINT_ERROR("%s", "Allocation of acg failed");
res = -ENOMEM;
goto out;
}
kref_init(&acg->acg_kref);
acg->tgt = tgt;
INIT_LIST_HEAD(&acg->acg_dev_list);
INIT_LIST_HEAD(&acg->acg_sess_list);
INIT_LIST_HEAD(&acg->acn_list);
cpumask_copy(&acg->acg_cpu_mask, &default_cpu_mask);
acg->acg_name = kstrdup(acg_name, GFP_KERNEL);
if (acg->acg_name == NULL) {
PRINT_ERROR("%s", "Allocation of acg_name failed");
res = -ENOMEM;
goto out_free;
}
res = scst_cm_on_add_acg(acg);
if (res != 0)
goto out_undup;
acg->addr_method = tgt->tgtt->preferred_addr_method;
if (tgt_acg) {
TRACE_DBG("Adding acg '%s' to device '%s' acg_list", acg_name,
tgt->tgt_name);
list_add_tail(&acg->acg_list_entry, &tgt->tgt_acg_list);
acg->tgt_acg = 1;
res = scst_acg_sysfs_create(tgt, acg);
if (res != 0)
goto out_del;
}
kobject_get(&tgt->tgt_kobj);
res = 0;
out:
*out_acg = acg;
TRACE_EXIT_RES(res);
return res;
out_del:
list_del(&acg->acg_list_entry);
out_undup:
kfree(acg->acg_name);
out_free:
kfree(acg);
acg = NULL;
goto out;
}
/*
* scst_del_acg - delete an ACG from the per-target ACG list and from sysfs
*
* The caller must hold scst_mutex and activity must have been suspended.
*
* Note: It is the responsibility of the caller to make sure that
* scst_put_acg() gets invoked.
*/
static void scst_del_acg(struct scst_acg *acg)
{
struct scst_acn *acn;
struct scst_acg_dev *acg_dev, *acg_dev_tmp;
scst_assert_activity_suspended();
lockdep_assert_held(&scst_mutex);
scst_cm_on_del_acg(acg);
list_for_each_entry_safe(acg_dev, acg_dev_tmp, &acg->acg_dev_list,
acg_dev_list_entry)
scst_del_acg_dev(acg_dev, false, true);
list_for_each_entry(acn, &acg->acn_list, acn_list_entry)
scst_acn_sysfs_del(acn);
if (acg->tgt_acg) {
TRACE_DBG("Removing acg %s from list", acg->acg_name);
list_del(&acg->acg_list_entry);
scst_acg_sysfs_del(acg);
} else {
acg->tgt->default_acg = NULL;
}
}
/*
* scst_free_acg - free an ACG
*
* The caller must hold scst_mutex and activity must have been suspended.
*/
static void scst_free_acg(struct scst_acg *acg)
{
struct scst_acg_dev *acg_dev, *acg_dev_tmp;
struct scst_acn *acn, *acnt;
struct scst_session *sess;
struct scst_tgt *tgt = acg->tgt;
/* For procfs acg->tgt could be NULL */
TRACE_DBG("Freeing acg %s/%s", tgt ? tgt->tgt_name : "(tgt=NULL)", acg->acg_name);
list_for_each_entry_safe(acg_dev, acg_dev_tmp, &acg->acg_dev_list,
acg_dev_list_entry) {
struct scst_tgt_dev *tgt_dev, *tt;
list_for_each_entry_safe(tgt_dev, tt,
&acg_dev->dev->dev_tgt_dev_list,
dev_tgt_dev_list_entry) {
if (tgt_dev->acg_dev == acg_dev) {
sess = tgt_dev->sess;
mutex_lock(&sess->tgt_dev_list_mutex);
scst_del_tgt_dev(tgt_dev);
mutex_unlock(&sess->tgt_dev_list_mutex);
synchronize_rcu();
scst_free_tgt_dev(tgt_dev);
}
}
scst_free_acg_dev(acg_dev);
}
list_for_each_entry_safe(acn, acnt, &acg->acn_list, acn_list_entry) {
scst_free_acn(acn,
list_is_last(&acn->acn_list_entry, &acg->acn_list));
}
kfree(acg->acg_name);
kfree(acg);
kobject_put(&tgt->tgt_kobj);
}
static void scst_release_acg(struct kref *kref)
{
struct scst_acg *acg = container_of(kref, struct scst_acg, acg_kref);
scst_free_acg(acg);
}
struct scst_acg_put_work {
struct work_struct work;
struct scst_acg *acg;
};
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20)
static void scst_put_acg_work(void *p)
{
struct scst_acg_put_work *put_work = p;
#else
static void scst_put_acg_work(struct work_struct *work)
{
struct scst_acg_put_work *put_work =
container_of(work, typeof(*put_work), work);
#endif
struct scst_acg *acg = put_work->acg;
kfree(put_work);
kref_put(&acg->acg_kref, scst_release_acg);
}
void scst_put_acg(struct scst_acg *acg)
{
struct scst_acg_put_work *put_work;
bool rc;
put_work = kmalloc(sizeof(*put_work), GFP_KERNEL | __GFP_NOFAIL);
if (WARN_ON_ONCE(!put_work)) {
kref_put(&acg->acg_kref, scst_release_acg);
return;
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20)
INIT_WORK(&put_work->work, scst_put_acg_work, put_work);
#else
INIT_WORK(&put_work->work, scst_put_acg_work);
#endif
put_work->acg = acg;
/*
* Schedule the kref_put() call instead of invoking it directly to
* avoid deep recursion and a stack overflow.
*/
rc = queue_work(scst_release_acg_wq, &put_work->work);
WARN_ON_ONCE(!rc);
return;
}
void scst_get_acg(struct scst_acg *acg)
{
kref_get(&acg->acg_kref);
}
/*
* scst_close_del_free_acg - close sessions, delete and free an ACG
*
* The caller must hold scst_mutex and activity must have been suspended.
*
* Note: deleting and freeing the ACG happens asynchronously. Each time a
* session is closed the ACG reference count is decremented, and if that
* reference count drops to zero the ACG is freed.
*/
int scst_del_free_acg(struct scst_acg *acg, bool close_sessions)
{
struct scst_tgt *tgt = acg->tgt;
struct scst_session *sess, *sess_tmp;
scst_assert_activity_suspended();
lockdep_assert_held(&scst_mutex);
if ((!close_sessions && !list_empty(&acg->acg_sess_list)) ||
(close_sessions && !tgt->tgtt->close_session))
return -EBUSY;
scst_del_acg(acg);
if (close_sessions) {
TRACE_DBG("Closing sessions for group %s/%s", tgt->tgt_name,
acg->acg_name);
list_for_each_entry_safe(sess, sess_tmp, &acg->acg_sess_list,
acg_sess_list_entry) {
TRACE_DBG("Closing session %s/%s/%s", tgt->tgt_name,
acg->acg_name, sess->initiator_name);
tgt->tgtt->close_session(sess);
}
}
scst_put_acg(acg);
return 0;
}
/* The activity supposed to be suspended and scst_mutex held */
struct scst_acg *scst_tgt_find_acg(struct scst_tgt *tgt, const char *name)
{
struct scst_acg *acg, *acg_ret = NULL;
TRACE_ENTRY();
list_for_each_entry(acg, &tgt->tgt_acg_list, acg_list_entry) {
if (strcmp(acg->acg_name, name) == 0) {
acg_ret = acg;
break;
}
}
TRACE_EXIT();
return acg_ret;
}
/* scst_mutex supposed to be held */
static struct scst_tgt_dev *scst_find_shared_io_tgt_dev(
struct scst_tgt_dev *tgt_dev)
{
struct scst_cmd_threads *a;
struct scst_tgt_dev *res = NULL;
struct scst_session *sess = tgt_dev->sess;
struct scst_acg *acg = tgt_dev->acg_dev->acg;
struct scst_tgt_dev *t;
TRACE_ENTRY();
TRACE_DBG("tgt_dev %s (acg %p, io_grouping_type %d)",
sess->initiator_name, acg, acg->acg_io_grouping_type);
switch (acg->acg_io_grouping_type) {
case SCST_IO_GROUPING_AUTO:
if (sess->initiator_name == NULL)
goto out;
list_for_each_entry(t, &tgt_dev->dev->dev_tgt_dev_list,
dev_tgt_dev_list_entry) {
if ((t == tgt_dev) ||
(t->sess->initiator_name == NULL) ||
(t->active_cmd_threads == NULL))
continue;
TRACE_DBG("t %s", t->sess->initiator_name);
/* We check other ACG's as well */
if (strcmp(t->sess->initiator_name,
sess->initiator_name) == 0)
goto found;
}
break;
case SCST_IO_GROUPING_THIS_GROUP_ONLY:
list_for_each_entry(t, &tgt_dev->dev->dev_tgt_dev_list,
dev_tgt_dev_list_entry) {
if ((t == tgt_dev) || (t->active_cmd_threads == NULL))
continue;
TRACE_DBG("t %s (acg %p)", t->sess->initiator_name,
t->acg_dev->acg);
if (t->acg_dev->acg == acg)
goto found;
}
break;
case SCST_IO_GROUPING_NEVER:
goto out;
default:
list_for_each_entry(t, &tgt_dev->dev->dev_tgt_dev_list,
dev_tgt_dev_list_entry) {
if ((t == tgt_dev) || (t->active_cmd_threads == NULL))
continue;
TRACE_DBG("t %s (acg %p, io_grouping_type %d)",
t->sess->initiator_name, t->acg_dev->acg,
t->acg_dev->acg->acg_io_grouping_type);
if (t->acg_dev->acg->acg_io_grouping_type ==
acg->acg_io_grouping_type)
goto found;
}
break;
}
out:
TRACE_EXIT_HRES((unsigned long)res);
return res;
found:
res = t;
a = t->active_cmd_threads;
if (a == &scst_main_cmd_threads) {
TRACE_DBG("Going to share async IO context %p (res %p, "
"ini %s, dev %s, grouping type %d)",
t->aic_keeper->aic, res, t->sess->initiator_name,
t->dev->virt_name,
t->acg_dev->acg->acg_io_grouping_type);
} else {
wait_event(a->ioctx_wq, a->io_context_ready);
smp_rmb();
TRACE_DBG("Going to share IO context %p (res %p, ini %s, "
"dev %s, cmd_threads %p, grouping type %d)",
res->active_cmd_threads->io_context, res,
t->sess->initiator_name, t->dev->virt_name,
t->active_cmd_threads,
t->acg_dev->acg->acg_io_grouping_type);
}
goto out;
}
enum scst_dev_type_threads_pool_type scst_parse_threads_pool_type(const char *p,
int len)
{
enum scst_dev_type_threads_pool_type res;
if (strncasecmp(p, SCST_THREADS_POOL_PER_INITIATOR_STR,
min_t(int, strlen(SCST_THREADS_POOL_PER_INITIATOR_STR),
len)) == 0)
res = SCST_THREADS_POOL_PER_INITIATOR;
else if (strncasecmp(p, SCST_THREADS_POOL_SHARED_STR,
min_t(int, strlen(SCST_THREADS_POOL_SHARED_STR),
len)) == 0)
res = SCST_THREADS_POOL_SHARED;
else {
PRINT_ERROR("Unknown threads pool type %s", p);
res = SCST_THREADS_POOL_TYPE_INVALID;
}
return res;
}
static int scst_ioc_keeper_thread(void *arg)
{
struct scst_async_io_context_keeper *aic_keeper =
(struct scst_async_io_context_keeper *)arg;
TRACE_ENTRY();
TRACE_MGMT_DBG("AIC %p keeper thread %s started", aic_keeper, current->comm);
current->flags |= PF_NOFREEZE;
sBUG_ON(aic_keeper->aic != NULL);
aic_keeper->aic = get_task_io_context(current, GFP_KERNEL, NUMA_NO_NODE);
TRACE_DBG("Alloced new async IO context %p (aic %p)",
aic_keeper->aic, aic_keeper);
/* We have our own ref counting */
put_io_context(aic_keeper->aic);
/* We are ready */
aic_keeper->aic_ready = true;
wake_up_all(&aic_keeper->aic_keeper_waitQ);
wait_event_interruptible(aic_keeper->aic_keeper_waitQ,
kthread_should_stop());
TRACE_MGMT_DBG("AIC %p keeper thread %s finished", aic_keeper,
current->comm);
TRACE_EXIT();
return 0;
}
/* scst_mutex supposed to be held */
int scst_tgt_dev_setup_threads(struct scst_tgt_dev *tgt_dev)
{
int res = 0;
struct scst_session *sess = tgt_dev->sess;
struct scst_tgt_template *tgtt = sess->tgt->tgtt;
struct scst_device *dev = tgt_dev->dev;
struct scst_async_io_context_keeper *aic_keeper;
TRACE_ENTRY();
tgt_dev->thread_index = -1;
if (dev->threads_num < 0)
goto out;
if (dev->threads_num == 0) {
struct scst_tgt_dev *shared_io_tgt_dev;
tgt_dev->active_cmd_threads = &scst_main_cmd_threads;
shared_io_tgt_dev = scst_find_shared_io_tgt_dev(tgt_dev);
if (shared_io_tgt_dev != NULL) {
aic_keeper = shared_io_tgt_dev->aic_keeper;
kref_get(&aic_keeper->aic_keeper_kref);
TRACE_DBG("Linking async io context %p "
"for shared tgt_dev %p (dev %s)",
aic_keeper->aic, tgt_dev,
tgt_dev->dev->virt_name);
} else {
/* Create new context */
aic_keeper = kzalloc_node(sizeof(*aic_keeper), GFP_KERNEL,
dev->dev_numa_node_id);
if (aic_keeper == NULL) {
PRINT_ERROR("Unable to alloc aic_keeper "
"(size %zd)", sizeof(*aic_keeper));
res = -ENOMEM;
goto out;
}
kref_init(&aic_keeper->aic_keeper_kref);
init_waitqueue_head(&aic_keeper->aic_keeper_waitQ);
aic_keeper->aic_keeper_thr =
kthread_run(scst_ioc_keeper_thread,
aic_keeper, "aic_keeper");
if (IS_ERR(aic_keeper->aic_keeper_thr)) {
PRINT_ERROR("Error running ioc_keeper "
"thread (tgt_dev %p)", tgt_dev);
res = PTR_ERR(aic_keeper->aic_keeper_thr);
goto out_free_keeper;
}
wait_event(aic_keeper->aic_keeper_waitQ,
aic_keeper->aic_ready);
TRACE_DBG("Created async io context %p "
"for not shared tgt_dev %p (dev %s)",
aic_keeper->aic, tgt_dev,
tgt_dev->dev->virt_name);
}
tgt_dev->async_io_context = aic_keeper->aic;
tgt_dev->aic_keeper = aic_keeper;
res = scst_add_threads(tgt_dev->active_cmd_threads, NULL, NULL,
tgtt->threads_num);
goto out;
}
switch (dev->threads_pool_type) {
case SCST_THREADS_POOL_PER_INITIATOR:
{
struct scst_tgt_dev *shared_io_tgt_dev;
scst_init_threads(&tgt_dev->tgt_dev_cmd_threads);
tgt_dev->active_cmd_threads = &tgt_dev->tgt_dev_cmd_threads;
shared_io_tgt_dev = scst_find_shared_io_tgt_dev(tgt_dev);
if (shared_io_tgt_dev != NULL) {
TRACE_DBG("Linking io context %p for "
"shared tgt_dev %p (cmd_threads %p)",
shared_io_tgt_dev->active_cmd_threads->io_context,
tgt_dev, tgt_dev->active_cmd_threads);
/* It's ref counted via threads */
tgt_dev->active_cmd_threads->io_context =
shared_io_tgt_dev->active_cmd_threads->io_context;
}
res = scst_add_threads(tgt_dev->active_cmd_threads, NULL,
tgt_dev,
dev->threads_num + tgtt->threads_num);
if (res != 0)
scst_deinit_threads(&tgt_dev->tgt_dev_cmd_threads);
break;
}
case SCST_THREADS_POOL_SHARED:
{
tgt_dev->active_cmd_threads = &dev->dev_cmd_threads;
res = scst_add_threads(tgt_dev->active_cmd_threads, dev, NULL,
tgtt->threads_num);
break;
}
case SCST_THREADS_POOL_TYPE_INVALID:
default:
PRINT_CRIT_ERROR("Unknown threads pool type %d (dev %s)",
dev->threads_pool_type, dev->virt_name);
sBUG();
break;
}
out:
if (res == 0)
tm_dbg_init_tgt_dev(tgt_dev);
else
tgt_dev->active_cmd_threads->io_context = NULL;
TRACE_EXIT_RES(res);
return res;
out_free_keeper:
kfree(aic_keeper);
goto out;
}
static void scst_aic_keeper_release(struct kref *kref)
{
struct scst_async_io_context_keeper *aic_keeper;
TRACE_ENTRY();
aic_keeper = container_of(kref, struct scst_async_io_context_keeper,
aic_keeper_kref);
kthread_stop(aic_keeper->aic_keeper_thr);
kfree(aic_keeper);
TRACE_EXIT();
return;
}
/* scst_mutex supposed to be held */
void scst_tgt_dev_stop_threads(struct scst_tgt_dev *tgt_dev)
{
TRACE_ENTRY();
lockdep_assert_held(&scst_mutex);
if (tgt_dev->dev->threads_num < 0)
goto out_deinit;
if (tgt_dev->active_cmd_threads == &scst_main_cmd_threads) {
/* Global async threads */
kref_put(&tgt_dev->aic_keeper->aic_keeper_kref,
scst_aic_keeper_release);
tgt_dev->async_io_context = NULL;
tgt_dev->aic_keeper = NULL;
} else if (tgt_dev->active_cmd_threads == &tgt_dev->dev->dev_cmd_threads) {
/* Per device shared threads */
scst_del_threads(tgt_dev->active_cmd_threads,
tgt_dev->tgtt->threads_num);
} else if (tgt_dev->active_cmd_threads == &tgt_dev->tgt_dev_cmd_threads) {
/* Per tgt_dev threads */
scst_del_threads(tgt_dev->active_cmd_threads, -1);
scst_deinit_threads(&tgt_dev->tgt_dev_cmd_threads);
} /* else no threads (not yet initialized, e.g.) */
out_deinit:
tm_dbg_deinit_tgt_dev(tgt_dev);
tgt_dev->active_cmd_threads = NULL;
TRACE_EXIT();
return;
}
static __be16 scst_dif_crc_fn(const void *data, unsigned int len);
static __be16 scst_dif_ip_fn(const void *data, unsigned int len);
/*
* scst_mutex supposed to be held, there must not be parallel activity in this
* session. May be invoked from inside scst_check_reassign_sessions() which
* means that sess->acg can be NULL.
*/
static int scst_alloc_add_tgt_dev(struct scst_session *sess,
struct scst_acg_dev *acg_dev, struct scst_tgt_dev **out_tgt_dev)
{
int res = 0;
struct scst_tgt_template *tgtt = sess->tgt->tgtt;
int ini_sg, ini_unchecked_isa_dma, ini_use_clustering;
struct scst_tgt_dev *tgt_dev;
struct scst_device *dev = acg_dev->dev;
struct list_head *head;
int sl;
uint8_t sense_buffer[SCST_STANDARD_SENSE_LEN];
TRACE_ENTRY();
tgt_dev = kmem_cache_zalloc(scst_tgtd_cachep, GFP_KERNEL);
if (tgt_dev == NULL) {
PRINT_ERROR("%s", "Allocation of scst_tgt_dev failed");
res = -ENOMEM;
goto out;
}
INIT_LIST_HEAD(&tgt_dev->sess_tgt_dev_list_entry);
tgt_dev->tgtt = tgtt;
tgt_dev->dev = dev;
tgt_dev->lun = acg_dev->lun;
tgt_dev->acg_dev = acg_dev;
tgt_dev->tgt_dev_rd_only = acg_dev->acg_dev_rd_only || dev->dev_rd_only;
if (sess->tgt->tgt_forward_dst)
set_bit(SCST_TGT_DEV_FORWARD_DST, &tgt_dev->tgt_dev_flags);
else
clear_bit(SCST_TGT_DEV_FORWARD_DST, &tgt_dev->tgt_dev_flags);
tgt_dev->hw_dif_same_sg_layout_required = sess->tgt->tgt_hw_dif_same_sg_layout_required;
tgt_dev->tgt_dev_dif_guard_format = acg_dev->acg_dev_dif_guard_format;
if (tgt_dev->tgt_dev_dif_guard_format == SCST_DIF_GUARD_FORMAT_IP)
tgt_dev->tgt_dev_dif_crc_fn = scst_dif_ip_fn;
else {
EXTRACHECKS_BUG_ON(tgt_dev->tgt_dev_dif_guard_format != SCST_DIF_GUARD_FORMAT_CRC);
tgt_dev->tgt_dev_dif_crc_fn = scst_dif_crc_fn;
}
atomic_set(&tgt_dev->tgt_dev_dif_app_failed_tgt, 0);
atomic_set(&tgt_dev->tgt_dev_dif_ref_failed_tgt, 0);
atomic_set(&tgt_dev->tgt_dev_dif_guard_failed_tgt, 0);
atomic_set(&tgt_dev->tgt_dev_dif_app_failed_scst, 0);
atomic_set(&tgt_dev->tgt_dev_dif_ref_failed_scst, 0);
atomic_set(&tgt_dev->tgt_dev_dif_guard_failed_scst, 0);
atomic_set(&tgt_dev->tgt_dev_dif_app_failed_dev, 0);
atomic_set(&tgt_dev->tgt_dev_dif_ref_failed_dev, 0);
atomic_set(&tgt_dev->tgt_dev_dif_guard_failed_dev, 0);
tgt_dev->sess = sess;
atomic_set(&tgt_dev->tgt_dev_cmd_count, 0);
if (acg_dev->acg->acg_black_hole_type != SCST_ACG_BLACK_HOLE_NONE)
set_bit(SCST_TGT_DEV_BLACK_HOLE, &tgt_dev->tgt_dev_flags);
else
clear_bit(SCST_TGT_DEV_BLACK_HOLE, &tgt_dev->tgt_dev_flags);
scst_sgv_pool_use_norm(tgt_dev);
if (dev->scsi_dev != NULL) {
struct Scsi_Host *shost = dev->scsi_dev->host;
ini_sg = shost->sg_tablesize;
ini_unchecked_isa_dma = shost->unchecked_isa_dma;
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 21, 0)
ini_use_clustering = shost->use_clustering == ENABLE_CLUSTERING;
#else
ini_use_clustering = !(shost->dma_boundary == PAGE_SIZE - 1 &&
shost->max_segment_size == PAGE_SIZE);
#endif
} else {
ini_sg = (1 << 15) /* infinite */;
ini_unchecked_isa_dma = 0;
ini_use_clustering = 0;
}
tgt_dev->max_sg_cnt = min(ini_sg, sess->tgt->sg_tablesize);
if ((sess->tgt->tgtt->use_clustering || ini_use_clustering) &&
!sess->tgt->tgtt->no_clustering &&
!(sess->tgt->tgt_hw_dif_same_sg_layout_required &&
(tgt_dev->dev->dev_dif_type != 0)))
scst_sgv_pool_use_norm_clust(tgt_dev);
if (sess->tgt->tgtt->unchecked_isa_dma || ini_unchecked_isa_dma)
scst_sgv_pool_use_dma(tgt_dev);
TRACE_MGMT_DBG("Device %s on SCST lun=%lld",
dev->virt_name, (unsigned long long)tgt_dev->lun);
spin_lock_init(&tgt_dev->tgt_dev_lock);
lockdep_register_key(&tgt_dev->tgt_dev_key);
lockdep_set_class(&tgt_dev->tgt_dev_lock, &tgt_dev->tgt_dev_key);
INIT_LIST_HEAD(&tgt_dev->UA_list);
scst_init_order_data(&tgt_dev->tgt_dev_order_data);
if (dev->tst == SCST_TST_1_SEP_TASK_SETS)
tgt_dev->curr_order_data = &tgt_dev->tgt_dev_order_data;
else
tgt_dev->curr_order_data = &dev->dev_order_data;
if (dev->handler->parse_atomic &&
dev->handler->dev_alloc_data_buf_atomic &&
(sess->tgt->tgtt->preprocessing_done == NULL)) {
if (sess->tgt->tgtt->rdy_to_xfer_atomic)
tgt_dev->tgt_dev_after_init_wr_atomic = 1;
}
if (dev->handler->dev_done_atomic &&
sess->tgt->tgtt->xmit_response_atomic)
tgt_dev->tgt_dev_after_exec_atomic = 1;
sl = scst_set_sense(sense_buffer, sizeof(sense_buffer),
dev->d_sense, SCST_LOAD_SENSE(scst_sense_reset_UA));
scst_alloc_set_UA(tgt_dev, sense_buffer, sl, 0);
if (sess->tgt->tgtt->get_initiator_port_transport_id == NULL) {
if (!list_empty(&dev->dev_registrants_list)) {
PRINT_WARNING("Initiators from target %s can't connect "
"to device %s, because the device has PR "
"registrants and the target doesn't support "
"Persistent Reservations", sess->tgt->tgtt->name,
dev->virt_name);
res = -EPERM;
goto out_free_ua;
}
dev->not_pr_supporting_tgt_devs_num++;
}
res = scst_pr_init_tgt_dev(tgt_dev);
if (res != 0)
goto out_dec_free;
res = scst_tgt_dev_setup_threads(tgt_dev);
if (res != 0)
goto out_pr_clear;
if (dev->handler->attach_tgt) {
TRACE_DBG("Calling dev handler's attach_tgt(%p)", tgt_dev);
res = dev->handler->attach_tgt(tgt_dev);
TRACE_DBG("%s", "Dev handler's attach_tgt() returned");
if (res != 0) {
PRINT_ERROR("Device handler's %s attach_tgt() "
"failed: %d", dev->handler->name, res);
goto out_stop_threads;
}
}
res = scst_tgt_dev_sysfs_create(tgt_dev);
if (res != 0)
goto out_detach;
spin_lock_bh(&dev->dev_lock);
list_add_tail(&tgt_dev->dev_tgt_dev_list_entry, &dev->dev_tgt_dev_list);
spin_unlock_bh(&dev->dev_lock);
mutex_lock(&sess->tgt_dev_list_mutex);
head = &sess->sess_tgt_dev_list[SESS_TGT_DEV_LIST_HASH_FN(tgt_dev->lun)];
list_add_tail_rcu(&tgt_dev->sess_tgt_dev_list_entry, head);
mutex_unlock(&sess->tgt_dev_list_mutex);
scst_tg_init_tgt_dev(tgt_dev);
*out_tgt_dev = tgt_dev;
percpu_ref_get(&dev->refcnt);
out:
TRACE_EXIT_RES(res);
return res;
out_detach:
if (dev->handler->detach_tgt) {
TRACE_DBG("Calling dev handler's detach_tgt(%p)",
tgt_dev);
dev->handler->detach_tgt(tgt_dev);
TRACE_DBG("%s", "Dev handler's detach_tgt() returned");
}
out_stop_threads:
scst_tgt_dev_stop_threads(tgt_dev);
out_pr_clear:
scst_pr_clear_tgt_dev(tgt_dev);
out_dec_free:
if (tgtt->get_initiator_port_transport_id == NULL)
dev->not_pr_supporting_tgt_devs_num--;
out_free_ua:
scst_free_all_UA(tgt_dev);
lockdep_unregister_key(&tgt_dev->tgt_dev_key);
kmem_cache_free(scst_tgtd_cachep, tgt_dev);
goto out;
}
/*
* The caller must ensure that tgt_dev does not disappear while this function
* is in progress.
*/
void scst_nexus_loss(struct scst_tgt_dev *tgt_dev, bool queue_UA)
{
TRACE_ENTRY();
if (queue_UA) {
uint8_t sense_buffer[SCST_STANDARD_SENSE_LEN];
int sl = scst_set_sense(sense_buffer, sizeof(sense_buffer),
tgt_dev->dev->d_sense,
SCST_LOAD_SENSE(scst_sense_nexus_loss_UA));
scst_check_set_UA(tgt_dev, sense_buffer, sl,
SCST_SET_UA_FLAG_AT_HEAD);
}
TRACE_EXIT();
return;
}
static void scst_del_tgt_dev(struct scst_tgt_dev *tgt_dev)
{
struct scst_device *dev = tgt_dev->dev;
lockdep_assert_held(&scst_mutex);
#ifdef CONFIG_SCST_EXTRACHECKS
if (scst_is_active_tgt_dev(tgt_dev))
lockdep_assert_held(&tgt_dev->sess->tgt_dev_list_mutex);
#endif
spin_lock_bh(&dev->dev_lock);
list_del(&tgt_dev->dev_tgt_dev_list_entry);
spin_unlock_bh(&dev->dev_lock);
list_del_rcu(&tgt_dev->sess_tgt_dev_list_entry);
scst_tgt_dev_sysfs_del(tgt_dev);
}
/*
* The caller must ensure that tgt_dev is not on sess_tgt_dev_list. The caller
* is also responsible for calling synchronize_rcu() before freeing a tgt_dev
* if another thread could still be accessing @tgt_dev from inside an RCU
* read-side critical section.
*/
static void scst_free_tgt_dev(struct scst_tgt_dev *tgt_dev)
{
struct scst_tgt_template *tgtt = tgt_dev->tgtt;
struct scst_device *dev = tgt_dev->dev;
TRACE_ENTRY();
#ifdef CONFIG_SCST_EXTRACHECKS
WARN_ON_ONCE(scst_is_active_tgt_dev(tgt_dev));
#endif
WARN_ON_ONCE(atomic_read(&tgt_dev->tgt_dev_cmd_count) != 0);
if (tgtt->get_initiator_port_transport_id == NULL)
dev->not_pr_supporting_tgt_devs_num--;
scst_clear_reservation(tgt_dev);
scst_pr_clear_tgt_dev(tgt_dev);
scst_free_all_UA(tgt_dev);
if (dev->handler && dev->handler->detach_tgt) {
TRACE_DBG("Calling dev handler's detach_tgt(%p)",
tgt_dev);
dev->handler->detach_tgt(tgt_dev);
TRACE_DBG("%s", "Dev handler's detach_tgt() returned");
}
scst_tgt_dev_stop_threads(tgt_dev);
lockdep_unregister_key(&tgt_dev->tgt_dev_key);
kmem_cache_free(scst_tgtd_cachep, tgt_dev);
percpu_ref_put(&dev->refcnt);
TRACE_EXIT();
return;
}
/* scst_mutex supposed to be held */
int scst_sess_alloc_tgt_devs(struct scst_session *sess)
{
int res = 0;
struct scst_acg_dev *acg_dev;
struct scst_tgt_dev *tgt_dev;
TRACE_ENTRY();
list_for_each_entry(acg_dev, &sess->acg->acg_dev_list,
acg_dev_list_entry) {
res = scst_alloc_add_tgt_dev(sess, acg_dev, &tgt_dev);
if (res == -EPERM)
continue;
else if (res != 0)
goto out_free;
}
out:
TRACE_EXIT();
return res;
out_free:
scst_sess_free_tgt_devs(sess);
goto out;
}
void scst_sess_free_tgt_devs(struct scst_session *sess)
{
int i;
struct scst_tgt_dev *tgt_dev, *t;
TRACE_ENTRY();
mutex_lock(&sess->tgt_dev_list_mutex);
for (i = 0; i < SESS_TGT_DEV_LIST_HASH_SIZE; i++) {
struct list_head *head = &sess->sess_tgt_dev_list[i];
list_for_each_entry_safe(tgt_dev, t, head,
sess_tgt_dev_list_entry) {
scst_del_tgt_dev(tgt_dev);
synchronize_rcu();
scst_free_tgt_dev(tgt_dev);
}
INIT_LIST_HEAD(head);
}
mutex_unlock(&sess->tgt_dev_list_mutex);
TRACE_EXIT();
return;
}
/* The activity supposed to be suspended and scst_mutex held */
int scst_acg_add_acn(struct scst_acg *acg, const char *name)
{
int res = 0;
struct scst_acn *acn;
char *nm;
TRACE_ENTRY();
list_for_each_entry(acn, &acg->acn_list, acn_list_entry) {
if (strcmp(acn->name, name) == 0) {
PRINT_ERROR("Name %s already exists in group %s",
name, acg->acg_name);
res = -EEXIST;
goto out;
}
}
acn = kzalloc(sizeof(*acn), GFP_KERNEL);
if (acn == NULL) {
PRINT_ERROR("%s", "Unable to allocate scst_acn");
res = -ENOMEM;
goto out;
}
acn->acg = acg;
nm = kstrdup(name, GFP_KERNEL);
if (nm == NULL) {
PRINT_ERROR("%s", "Unable to allocate scst_acn->name");
res = -ENOMEM;
goto out_free;
}
acn->name = nm;
res = scst_acn_sysfs_create(acn);
if (res != 0)
goto out_free_nm;
list_add_tail(&acn->acn_list_entry, &acg->acn_list);
out:
if (res == 0) {
PRINT_INFO("Added name %s to group %s (target %s)", name,
acg->acg_name, acg->tgt ? acg->tgt->tgt_name : "?");
scst_check_reassign_sessions();
}
TRACE_EXIT_RES(res);
return res;
out_free_nm:
kfree(nm);
out_free:
kfree(acn);
goto out;
}
/* The activity supposed to be suspended and scst_mutex held */
static void scst_free_acn(struct scst_acn *acn, bool reassign)
{
kfree(acn->name);
kfree(acn);
if (reassign)
scst_check_reassign_sessions();
}
/* The activity supposed to be suspended and scst_mutex held */
void scst_del_free_acn(struct scst_acn *acn, bool reassign)
{
TRACE_ENTRY();
list_del(&acn->acn_list_entry);
scst_acn_sysfs_del(acn);
scst_free_acn(acn, reassign);
TRACE_EXIT();
return;
}
/* The activity supposed to be suspended and scst_mutex held */
struct scst_acn *scst_find_acn(struct scst_acg *acg, const char *name)
{
struct scst_acn *acn;
TRACE_ENTRY();
TRACE_DBG("Trying to find name '%s'", name);
list_for_each_entry(acn, &acg->acn_list, acn_list_entry) {
if (strcmp(acn->name, name) == 0) {
TRACE_DBG("%s", "Found");
goto out;
}
}
acn = NULL;
out:
TRACE_EXIT();
return acn;
}
/**
* __scst_create_prepare_internal_cmd() - Create an internal SCSI command
* @cdb: SCSI CDB.
* @cdb_len: Length in bytes of @cdb.
* @queue_type: One of the SCST_CMD_QUEUE_* constants.
* @tgt_dev: LUN to submit the command to.
* @gfp_mask: GFP mask to use during execution of this command.
* @fantom: If false, add the command to tgt_dev->sess->sess_cmd_list.
* If true, do not add the command to that command list.
*
* Return: pointer to the newly allocated command or NULL.
*/
struct scst_cmd *__scst_create_prepare_internal_cmd(const uint8_t *cdb,
unsigned int cdb_len, enum scst_cmd_queue_type queue_type,
struct scst_tgt_dev *tgt_dev, gfp_t gfp_mask, bool fantom)
{
struct scst_cmd *res;
int rc;
unsigned long flags;
TRACE_ENTRY();
res = scst_alloc_cmd(cdb, cdb_len, gfp_mask);
if (res == NULL)
goto out;
res->cmd_threads = tgt_dev->active_cmd_threads;
res->sess = tgt_dev->sess;
res->internal = 1;
res->tgtt = tgt_dev->tgtt;
res->tgt = tgt_dev->sess->tgt;
res->dev = tgt_dev->dev;
res->devt = tgt_dev->dev->handler;
res->tgt_dev = tgt_dev;
res->cur_order_data = tgt_dev->curr_order_data;
res->lun = tgt_dev->lun;
res->queue_type = queue_type;
res->data_direction = SCST_DATA_UNKNOWN;
if (!fantom) {
/*
* We need to keep it here to be able to abort during TM
* processing. They should be aborted to (1) speed up TM
* processing and (2) to guarantee that after a TM command
* finished the affected device(s) is/are in a quiescent state
* with all affected commands finished and others - blocked.
*
* Fantom commands are exception, because they don't do any
* real work.
*/
spin_lock_irqsave(&res->sess->sess_list_lock, flags);
list_add_tail(&res->sess_cmd_list_entry, &res->sess->sess_cmd_list);
spin_unlock_irqrestore(&res->sess->sess_list_lock, flags);
}
scst_sess_get(res->sess);
res->cpu_cmd_counter = scst_get();
TRACE(TRACE_SCSI, "New internal cmd %p (op %s)", res,
scst_get_opcode_name(res));
rc = scst_pre_parse(res);
sBUG_ON(rc != 0);
scst_set_cmd_state(res, SCST_CMD_STATE_PARSE);
out:
TRACE_EXIT_HRES((unsigned long)res);
return res;
}
static struct scst_cmd *scst_create_prepare_internal_cmd(
struct scst_cmd *orig_cmd, const uint8_t *cdb,
unsigned int cdb_len, enum scst_cmd_queue_type queue_type)
{
struct scst_cmd *res;
gfp_t gfp_mask = scst_cmd_atomic(orig_cmd) ? GFP_ATOMIC : orig_cmd->cmd_gfp_mask;
TRACE_ENTRY();
res = __scst_create_prepare_internal_cmd(cdb, cdb_len, queue_type,
orig_cmd->tgt_dev, gfp_mask, false);
if (res == NULL)
goto out;
res->atomic = scst_cmd_atomic(orig_cmd);
out:
TRACE_EXIT_HRES((unsigned long)res);
return res;
}
static void scst_prelim_finish_internal_cmd(struct scst_cmd *cmd)
{
unsigned long flags;
TRACE_ENTRY();
sBUG_ON(!cmd->internal);
spin_lock_irqsave(&cmd->sess->sess_list_lock, flags);
list_del(&cmd->sess_cmd_list_entry);
spin_unlock_irqrestore(&cmd->sess->sess_list_lock, flags);
__scst_cmd_put(cmd);
TRACE_EXIT();
return;
}
struct scst_request_sense_priv {
scst_i_finish_fn_t finish_fn;
struct scst_cmd *orig_cmd;
};
static void scst_complete_request_sense(struct scst_cmd *cmd);
int scst_prepare_request_sense(struct scst_cmd *orig_cmd)
{
static const uint8_t request_sense[6] = {
REQUEST_SENSE, 0, 0, 0, SCST_SENSE_BUFFERSIZE, 0
};
struct scst_request_sense_priv *priv;
struct scst_cmd *rs_cmd;
int res = -ENOMEM;
TRACE_ENTRY();
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
goto out;
priv->finish_fn = scst_complete_request_sense;
priv->orig_cmd = orig_cmd;
if (orig_cmd->sense != NULL) {
TRACE_MEM("Releasing sense %p (orig_cmd %p)",
orig_cmd->sense, orig_cmd);
mempool_free(orig_cmd->sense, scst_sense_mempool);
orig_cmd->sense = NULL;
}
rs_cmd = scst_create_prepare_internal_cmd(orig_cmd,
request_sense, sizeof(request_sense),
SCST_CMD_QUEUE_HEAD_OF_QUEUE);
if (rs_cmd == NULL)
goto free_priv;
rs_cmd->tgt_i_priv = priv;
rs_cmd->cdb[1] |= scst_get_cmd_dev_d_sense(orig_cmd);
rs_cmd->expected_data_direction = SCST_DATA_READ;
rs_cmd->expected_transfer_len_full = SCST_SENSE_BUFFERSIZE;
rs_cmd->expected_values_set = 1;
TRACE_MGMT_DBG("Adding REQUEST SENSE cmd %p to head of active "
"cmd list", rs_cmd);
spin_lock_irq(&rs_cmd->cmd_threads->cmd_list_lock);
list_add(&rs_cmd->cmd_list_entry, &rs_cmd->cmd_threads->active_cmd_list);
wake_up(&rs_cmd->cmd_threads->cmd_list_waitQ);
spin_unlock_irq(&rs_cmd->cmd_threads->cmd_list_lock);
res = 0;
out:
TRACE_EXIT_RES(res);
return res;
free_priv:
kfree(priv);
goto out;
}
static void scst_complete_request_sense(struct scst_cmd *req_cmd)
{
struct scst_request_sense_priv *priv = req_cmd->tgt_i_priv;
struct scst_cmd *orig_cmd = priv->orig_cmd;
uint8_t *buf;
int len;
TRACE_ENTRY();
kfree(priv);
sBUG_ON(orig_cmd == NULL);
len = scst_get_buf_full(req_cmd, &buf, false);
if (scsi_status_is_good(req_cmd->status) && (len > 0) &&
scst_sense_valid(buf)) {
TRACE(TRACE_SCSI|TRACE_MGMT_DEBUG, "REQUEST SENSE %p returned "
"valid sense (orig cmd %s)", req_cmd, orig_cmd->op_name);
PRINT_BUFF_FLAG(TRACE_SCSI|TRACE_MGMT_DEBUG, "Sense", buf, len);
if (scst_no_sense(buf))
PRINT_WARNING("REQUEST SENSE returned NO SENSE (orig "
"cmd %s)", orig_cmd->op_name);
scst_alloc_set_sense(orig_cmd, scst_cmd_atomic(req_cmd),
buf, len);
} else {
if (test_bit(SCST_CMD_ABORTED, &req_cmd->cmd_flags) &&
!test_bit(SCST_CMD_ABORTED, &orig_cmd->cmd_flags)) {
TRACE_MGMT_DBG("REQUEST SENSE %p was aborted, but "
"orig_cmd %p - not, retry", req_cmd, orig_cmd);
} else {
PRINT_ERROR("%s", "Unable to get the sense via "
"REQUEST SENSE, returning HARDWARE ERROR");
scst_set_cmd_error(orig_cmd,
SCST_LOAD_SENSE(scst_sense_internal_failure));
}
}
if (len > 0)
scst_put_buf_full(req_cmd, buf);
TRACE_MGMT_DBG("Adding orig cmd %p to head of active "
"cmd list", orig_cmd);
spin_lock_irq(&orig_cmd->cmd_threads->cmd_list_lock);
list_add(&orig_cmd->cmd_list_entry, &orig_cmd->cmd_threads->active_cmd_list);
wake_up(&orig_cmd->cmd_threads->cmd_list_waitQ);
spin_unlock_irq(&orig_cmd->cmd_threads->cmd_list_lock);
TRACE_EXIT();
return;
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 19, 0)
static int scst_cmp_fs_ds(void)
{
mm_segment_t fs = get_fs();
mm_segment_t ds = KERNEL_DS;
return memcmp(&fs, &ds, sizeof(fs));
}
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 9, 0) && !defined(RHEL_MAJOR)
ssize_t kernel_write(struct file *file, const void *buf, size_t count,
loff_t *pos)
{
struct kvec iov = {
.iov_base = buf,
.iov_len = count
};
return scst_writev(file, &iov, 1, pos);
}
EXPORT_SYMBOL(kernel_write);
#endif
/**
* scst_writev - read data from a file into a kernel buffer
* @file: File to read from.
* @vec: Pointer to first element of struct kvec array.
* @vlen: Number of elements of the kvec array.
* @pos: Position in @file where to start reading.
*/
ssize_t scst_readv(struct file *file, const struct kvec *vec,
unsigned long vlen, loff_t *pos)
{
ssize_t result;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 19, 0)
struct iov_iter iter;
struct kiocb kiocb;
size_t count = 0;
int i;
init_sync_kiocb(&kiocb, file);
kiocb.ki_pos = *pos;
for (i = 0; i < vlen; i++)
count += vec[i].iov_len;
iov_iter_kvec(&iter, READ, vec, vlen, count);
result = call_read_iter(file, &kiocb, &iter);
sBUG_ON(result == -EIOCBQUEUED);
if (result > 0)
*pos += result;
#else
mm_segment_t old_fs = get_fs();
set_fs(KERNEL_DS);
WARN_ON_ONCE(scst_cmp_fs_ds() != 0);
BUILD_BUG_ON(sizeof(struct kvec) != sizeof(struct iovec));
BUILD_BUG_ON(offsetof(struct kvec, iov_base) !=
offsetof(struct iovec, iov_base));
BUILD_BUG_ON(offsetof(struct kvec, iov_len) !=
offsetof(struct iovec, iov_len));
result = vfs_readv(file, (const struct iovec __user *)vec, vlen, pos);
set_fs(old_fs);
#endif
return result;
}
EXPORT_SYMBOL(scst_readv);
/**
* scst_writev - write kernel data to a file
* @file: File to write to.
* @vec: Pointer to first element of struct kvec array.
* @vlen: Number of elements of the kvec array.
* @pos: Position in @file where to start writing.
*/
ssize_t scst_writev(struct file *file, const struct kvec *vec,
unsigned long vlen, loff_t *pos)
{
ssize_t result;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 19, 0)
struct iov_iter iter;
struct kiocb kiocb;
size_t count = 0;
int i;
init_sync_kiocb(&kiocb, file);
kiocb.ki_pos = *pos;
for (i = 0; i < vlen; i++)
count += vec[i].iov_len;
iov_iter_kvec(&iter, WRITE, vec, vlen, count);
file_start_write(file);
result = call_write_iter(file, &kiocb, &iter);
file_end_write(file);
sBUG_ON(result == -EIOCBQUEUED);
if (result > 0)
*pos += result;
#else
mm_segment_t old_fs = get_fs();
set_fs(KERNEL_DS);
WARN_ON_ONCE(scst_cmp_fs_ds() != 0);
BUILD_BUG_ON(sizeof(struct kvec) != sizeof(struct iovec));
BUILD_BUG_ON(offsetof(struct kvec, iov_base) !=
offsetof(struct iovec, iov_base));
BUILD_BUG_ON(offsetof(struct kvec, iov_len) !=
offsetof(struct iovec, iov_len));
result = vfs_writev(file, (const struct iovec __user *)vec, vlen, pos);
set_fs(old_fs);
#endif
return result;
}
EXPORT_SYMBOL(scst_writev);
struct scst_ws_sg_tail {
struct scatterlist *sg;
int sg_cnt;
};
struct scst_write_same_priv {
/* Must be the first for scst_finish_internal_cmd()! */
scst_i_finish_fn_t ws_finish_fn;
struct scst_cmd *ws_orig_cmd;
struct mutex ws_mutex;
/* 0 len terminated */
struct scst_data_descriptor *ws_descriptors;
int ws_cur_descr;
int ws_left_to_send; /* in blocks */
int64_t ws_cur_lba; /* in blocks */
__be16 guard_tag;
__be16 app_tag;
uint32_t ref_tag;
unsigned int dif_valid:1;
unsigned int inc_ref_tag:1;
int ws_max_each;/* in blocks */
int ws_cur_in_flight; /* commands */
struct scst_ws_sg_tail *ws_sg_tails;
struct scatterlist *ws_sg_full;
int ws_sg_full_cnt;
};
#ifdef CONFIG_SCST_EXTRACHECKS
static u64 sg_data_length(struct scatterlist *sgl, int nr)
{
struct scatterlist *sg;
u64 len = 0;
int i;
for_each_sg(sgl, sg, nr, i)
len += sg->length;
return len;
}
#endif
/* ws_mutex suppose to be locked */
static int scst_ws_push_single_write(struct scst_write_same_priv *wsp,
int64_t lba, int blocks)
{
struct scst_cmd *ws_cmd = wsp->ws_orig_cmd;
struct scst_device *dev = ws_cmd->dev;
struct scatterlist *ws_sg;
int ws_sg_cnt;
int res;
uint8_t write_cdb[32];
int write_cdb_len;
int len = blocks << ws_cmd->dev->block_shift;
struct scst_cmd *cmd;
bool needs_dif = wsp->dif_valid;
TRACE_ENTRY();
if (blocks == wsp->ws_max_each) {
ws_sg = wsp->ws_sg_full;
ws_sg_cnt = wsp->ws_sg_full_cnt;
} else {
ws_sg = wsp->ws_sg_tails[wsp->ws_cur_descr].sg;
ws_sg_cnt = wsp->ws_sg_tails[wsp->ws_cur_descr].sg_cnt;
}
#ifdef CONFIG_SCST_EXTRACHECKS
if (len != sg_data_length(ws_sg, ws_sg_cnt))
WARN_ONCE(true, "lba %lld: %d <> %lld\n", lba, len,
sg_data_length(ws_sg, ws_sg_cnt));
#endif
if (unlikely(test_bit(SCST_CMD_ABORTED, &ws_cmd->cmd_flags)) ||
unlikely(ws_cmd->completed)) {
TRACE_DBG("ws cmd %p aborted or completed (%d), aborting "
"further write commands", ws_cmd, ws_cmd->completed);
wsp->ws_left_to_send = 0;
res = -EPIPE;
goto out;
}
if (!needs_dif || (dev->dev_dif_type != 2)) {
memset(write_cdb, 0, sizeof(write_cdb));
write_cdb[0] = WRITE_16;
write_cdb_len = 16;
write_cdb[1] = ws_cmd->cdb[1];
if (needs_dif) {
uint8_t wrprotect = ws_cmd->cdb[1] & 0xE0;
if (wrprotect == 0)
wrprotect = 0x20;
write_cdb[1] |= wrprotect;
}
put_unaligned_be64(lba, &write_cdb[2]);
put_unaligned_be32(blocks, &write_cdb[10]);
} else {
/* There might be WRITE SAME(16) with WRPROTECT 0 here */
uint8_t wrprotect;
if (ws_cmd->cdb_len != 32)
wrprotect = ws_cmd->cdb[1] & 0xE0;
else
wrprotect = ws_cmd->cdb[10] & 0xE0;
if (wrprotect == 0)
wrprotect = 0x20;
write_cdb[0] = VARIABLE_LENGTH_CMD;
put_unaligned_be16(SUBCODE_WRITE_32, &write_cdb[8]);
write_cdb[7] = 0x18;
write_cdb_len = 32;
write_cdb[10] = ws_cmd->cdb[10];
write_cdb[10] |= wrprotect;
put_unaligned_be64(lba, &write_cdb[12]);
put_unaligned_be32(blocks, &write_cdb[28]);
put_unaligned_be32(wsp->ref_tag, &write_cdb[20]);
put_unaligned(wsp->app_tag, &write_cdb[24]);
write_cdb[26] = ws_cmd->cdb[26];
write_cdb[27] = ws_cmd->cdb[27];
}
cmd = scst_create_prepare_internal_cmd(ws_cmd, write_cdb,
write_cdb_len, SCST_CMD_QUEUE_SIMPLE);
if (cmd == NULL) {
res = -ENOMEM;
goto out_busy;
}
cmd->expected_data_direction = SCST_DATA_WRITE;
cmd->expected_transfer_len_full = len;
cmd->expected_values_set = 1;
cmd->tgt_i_priv = wsp;
if (needs_dif) {
struct scatterlist *dif_sg, *s;
struct sgv_pool_obj *dif_sgv = NULL;
int dif_bufflen, i, dif_sg_cnt = 0;
TRACE_DBG("Allocating and filling DIF buff for cmd %p "
"(ws_cmd %p)", cmd, ws_cmd);
dif_bufflen = blocks << SCST_DIF_TAG_SHIFT;
cmd->expected_transfer_len_full += dif_bufflen;
dif_sg = sgv_pool_alloc(ws_cmd->tgt_dev->pools[raw_smp_processor_id()],
dif_bufflen, GFP_KERNEL, 0, &dif_sg_cnt, &dif_sgv,
&cmd->dev->dev_mem_lim, NULL);
if (unlikely(dif_sg == NULL)) {
TRACE(TRACE_OUT_OF_MEM, "Unable to alloc DIF sg "
"for %d blocks", blocks);
res = -ENOMEM;
goto out_free_cmd;
}
cmd->out_sgv = dif_sgv; /* hacky, but it isn't used for WRITE(16/32) */
cmd->tgt_i_dif_sg = dif_sg;
cmd->tgt_i_dif_sg_cnt = dif_sg_cnt;
TRACE_DBG("dif_sg %p, cnt %d", dif_sg, dif_sg_cnt);
for_each_sg(dif_sg, s, dif_sg_cnt, i) {
int left = (s->length - s->offset) >> SCST_DIF_TAG_SHIFT;
struct t10_pi_tuple *t = sg_virt(s);
TRACE_DBG("sg %p, offset %d, length %d, left %d", s,
s->offset, s->length, left);
while (left > 0) {
t->app_tag = wsp->app_tag;
t->ref_tag = cpu_to_be32(wsp->ref_tag);
if (wsp->inc_ref_tag)
wsp->ref_tag++;
t->guard_tag = wsp->guard_tag;
t++;
left--;
}
}
}
cmd->tgt_i_sg = ws_sg;
cmd->tgt_i_sg_cnt = ws_sg_cnt;
cmd->tgt_i_data_buf_alloced = 1;
wsp->ws_cur_lba += blocks;
wsp->ws_left_to_send -= blocks;
wsp->ws_cur_in_flight++;
TRACE_DBG("Adding WRITE(16) cmd %p to active cmd list", cmd);
spin_lock_irq(&cmd->cmd_threads->cmd_list_lock);
list_add_tail(&cmd->cmd_list_entry, &cmd->cmd_threads->active_cmd_list);
spin_unlock_irq(&cmd->cmd_threads->cmd_list_lock);
res = 0;
out:
TRACE_EXIT_RES(res);
return res;
out_free_cmd:
scst_prelim_finish_internal_cmd(cmd);
out_busy:
scst_set_busy(ws_cmd);
goto out;
}
static void scst_ws_finished(struct scst_write_same_priv *wsp)
{
struct scst_cmd *ws_cmd = wsp->ws_orig_cmd;
int i;
TRACE_ENTRY();
TRACE_DBG("ws cmd %p finished with status %d", ws_cmd, ws_cmd->status);
sBUG_ON(wsp->ws_cur_in_flight != 0);
if (wsp->ws_sg_full &&
sg_page(&wsp->ws_sg_full[0]) != sg_page(ws_cmd->sg))
__free_page(sg_page(&wsp->ws_sg_full[0]));
else if (wsp->ws_sg_tails && wsp->ws_sg_tails[0].sg_cnt != 0 &&
sg_page(&wsp->ws_sg_tails[0].sg[0]) != sg_page(ws_cmd->sg))
__free_page(sg_page(&wsp->ws_sg_tails[0].sg[0]));
kfree(wsp->ws_sg_full);
if (wsp->ws_sg_tails) {
for (i = 0; wsp->ws_descriptors[i].sdd_blocks != 0; i++)
if (wsp->ws_sg_tails[i].sg_cnt != 0)
kfree(wsp->ws_sg_tails[i].sg);
kfree(wsp->ws_sg_tails);
}
kfree(wsp->ws_descriptors);
kfree(wsp);
ws_cmd->completed = 1; /* for success */
ws_cmd->scst_cmd_done(ws_cmd, SCST_CMD_STATE_DEFAULT, SCST_CONTEXT_THREAD);
TRACE_EXIT();
return;
}
/* Must be called in a thread context and no locks */
static void scst_ws_write_cmd_finished(struct scst_cmd *cmd)
{
struct scst_write_same_priv *wsp = cmd->tgt_i_priv;
struct scst_cmd *ws_cmd = wsp->ws_orig_cmd;
int rc, blocks;
TRACE_ENTRY();
TRACE_DBG("Write cmd %p finished (ws cmd %p, ws_cur_in_flight %d)",
cmd, ws_cmd, wsp->ws_cur_in_flight);
if (cmd->out_sgv != NULL)
sgv_pool_free(cmd->out_sgv, &cmd->dev->dev_mem_lim);
cmd->sg = NULL;
cmd->sg_cnt = 0;
mutex_lock(&wsp->ws_mutex);
wsp->ws_cur_in_flight--;
if (cmd->status != 0) {
TRACE_DBG("Write cmd %p (ws cmd %p) finished not successfully",
cmd, ws_cmd);
sBUG_ON(cmd->resp_data_len != 0);
if (cmd->status == SAM_STAT_CHECK_CONDITION)
rc = scst_set_cmd_error_sense(ws_cmd, cmd->sense,
cmd->sense_valid_len);
else {
sBUG_ON(cmd->sense != NULL);
rc = scst_set_cmd_error_status(ws_cmd, cmd->status);
}
if (rc != 0) {
/* Requeue possible UA */
if (scst_is_ua_sense(cmd->sense, cmd->sense_valid_len))
scst_requeue_ua(cmd, NULL, 0);
}
}
if (wsp->ws_left_to_send == 0) {
if (wsp->ws_descriptors[wsp->ws_cur_descr+1].sdd_blocks != 0) {
wsp->ws_cur_descr++;
wsp->ws_cur_lba = wsp->ws_descriptors[wsp->ws_cur_descr].sdd_lba;
wsp->ws_left_to_send = wsp->ws_descriptors[wsp->ws_cur_descr].sdd_blocks;
TRACE_DBG("wsp %p, cur descr %d, cur lba %lld, left %d",
wsp, wsp->ws_cur_descr, (long long)wsp->ws_cur_lba,
wsp->ws_left_to_send);
}
if (wsp->ws_left_to_send == 0)
goto out_check_finish;
}
blocks = min_t(int, wsp->ws_left_to_send, wsp->ws_max_each);
rc = scst_ws_push_single_write(wsp, wsp->ws_cur_lba, blocks);
if (rc != 0)
goto out_check_finish;
wake_up(&ws_cmd->cmd_threads->cmd_list_waitQ);
out_unlock:
mutex_unlock(&wsp->ws_mutex);
out:
TRACE_EXIT();
return;
out_check_finish:
if (wsp->ws_cur_in_flight > 0)
goto out_unlock;
mutex_unlock(&wsp->ws_mutex);
scst_ws_finished(wsp);
goto out;
}
/* Must be called in a thread context and no locks */
static void scst_ws_gen_writes(struct scst_write_same_priv *wsp)
{
struct scst_cmd *ws_cmd = wsp->ws_orig_cmd;
int cnt = 0;
int rc;
TRACE_ENTRY();
mutex_lock(&wsp->ws_mutex);
again:
while (wsp->ws_left_to_send >= wsp->ws_max_each &&
wsp->ws_cur_in_flight < SCST_MAX_IN_FLIGHT_INTERNAL_COMMANDS) {
rc = scst_ws_push_single_write(wsp, wsp->ws_cur_lba,
wsp->ws_max_each);
if (rc != 0)
goto out_err;
cnt++;
}
if (wsp->ws_left_to_send > 0 &&
wsp->ws_cur_in_flight < SCST_MAX_IN_FLIGHT_INTERNAL_COMMANDS) {
rc = scst_ws_push_single_write(wsp, wsp->ws_cur_lba,
wsp->ws_left_to_send);
if (rc != 0)
goto out_err;
cnt++;
}
if ((wsp->ws_left_to_send == 0) &&
(wsp->ws_descriptors[wsp->ws_cur_descr+1].sdd_blocks != 0)) {
wsp->ws_cur_descr++;
wsp->ws_cur_lba = wsp->ws_descriptors[wsp->ws_cur_descr].sdd_lba;
wsp->ws_left_to_send = wsp->ws_descriptors[wsp->ws_cur_descr].sdd_blocks;
TRACE_DBG("wsp %p, cur descr %d, cur lba %lld, left %d",
wsp, wsp->ws_cur_descr, (long long)wsp->ws_cur_lba,
wsp->ws_left_to_send);
goto again;
}
out_wake:
if (cnt != 0)
wake_up(&ws_cmd->cmd_threads->cmd_list_waitQ);
mutex_unlock(&wsp->ws_mutex);
out:
TRACE_EXIT();
return;
out_err:
if (wsp->ws_cur_in_flight != 0)
goto out_wake;
else {
mutex_unlock(&wsp->ws_mutex);
scst_ws_finished(wsp);
goto out;
}
}
static int scst_ws_sg_init(struct scatterlist **ws_sg, int ws_sg_cnt,
struct page *pg, unsigned int offset, unsigned int length,
unsigned int total_bytes)
{
struct scatterlist *sg;
int i;
*ws_sg = kmalloc_array(ws_sg_cnt, sizeof(**ws_sg), GFP_KERNEL);
if (*ws_sg == NULL) {
PRINT_ERROR("Unable to alloc sg for %d entries", ws_sg_cnt);
return -ENOMEM;
}
sg_init_table(*ws_sg, ws_sg_cnt);
for_each_sg(*ws_sg, sg, ws_sg_cnt, i) {
u32 len = min(total_bytes, length);
sg_set_page(sg, pg, len, offset);
total_bytes -= len;
}
sBUG_ON(total_bytes != 0); /* crash here to avoid data corruption */
return 0;
}
static int scst_ws_sg_tails_get(struct scst_data_descriptor *where, struct scst_write_same_priv *wsp)
{
int i;
uint64_t n;
TRACE_ENTRY();
for (i = 0; where[i].sdd_blocks != 0; i++) {
if (where[i].sdd_blocks >= wsp->ws_max_each) {
wsp->ws_sg_full_cnt = wsp->ws_max_each;
break;
}
}
while (where[i].sdd_blocks != 0)
i++;
wsp->ws_sg_tails = kcalloc(i + 1, sizeof(*wsp->ws_sg_tails),
GFP_KERNEL);
if (wsp->ws_sg_tails == NULL) {
PRINT_ERROR("Unable to allocate ws_sg_tails (size %zd)",
sizeof(*wsp->ws_sg_tails)*i);
return -ENOMEM;
}
for (i = 0; where[i].sdd_blocks != 0; i++) {
n = where[i].sdd_blocks;
wsp->ws_sg_tails[i].sg_cnt = do_div(n, wsp->ws_max_each);
}
TRACE_EXIT();
return 0;
}
/*
* Library function to perform WRITE SAME in a generic manner. On exit, cmd
* always completed with sense set, if necessary.
*
* Parameter "where" is an array of descriptors where to write the same
* block. Last element in this array has len 0. It must be allocated by
* k?alloc() and will be kfree() by this function on finish.
*/
void scst_write_same(struct scst_cmd *cmd, struct scst_data_descriptor *where)
{
struct scst_write_same_priv *wsp;
int i, rc;
struct page *pg = NULL;
unsigned int offset, length, mult, ws_sg_full_blocks, ws_sg_tail_blocks;
uint8_t ctrl_offs = (cmd->cdb_len < 32) ? 1 : 10;
TRACE_ENTRY();
if (unlikely(cmd->data_len <= 0)) {
scst_set_invalid_field_in_cdb(cmd, cmd->len_off, 0);
goto out_done;
}
if (cmd->sg_cnt != 1) {
PRINT_WARNING("WRITE SAME must contain only single block of data "
"in a single SG (cmd %p)", cmd);
scst_set_cmd_error(cmd, SCST_LOAD_SENSE(scst_sense_parameter_value_invalid));
goto out_done;
}
if (unlikely((cmd->cdb[ctrl_offs] & 0x6) != 0)) {
TRACE(TRACE_MINOR, "LBDATA and/or PBDATA (ctrl %x) are not "
"supported", cmd->cdb[ctrl_offs]);
scst_set_invalid_field_in_cdb(cmd, ctrl_offs,
SCST_INVAL_FIELD_BIT_OFFS_VALID | 1);
goto out_done;
}
if (unlikely((uint64_t)cmd->data_len > cmd->dev->max_write_same_len)) {
PRINT_WARNING("Invalid WRITE SAME data len %lld (max allowed "
"%lld)", (long long)cmd->data_len,
(long long)cmd->dev->max_write_same_len);
scst_set_invalid_field_in_cdb(cmd, cmd->len_off, 0);
goto out_done;
}
if (where == NULL) {
where = kzalloc(sizeof(*where) << 1, GFP_KERNEL);
if (where == NULL) {
PRINT_ERROR("Unable to allocate ws_priv (size %zd, cmd %p)",
sizeof(*where) << 1, cmd);
goto out_busy;
}
where->sdd_lba = cmd->lba;
where->sdd_blocks = cmd->data_len >> cmd->dev->block_shift;
}
if (unlikely(where->sdd_blocks == 0))
goto out_done;
rc = scst_dif_process_write(cmd);
if (unlikely(rc != 0))
goto out_done;
wsp = kzalloc(sizeof(*wsp), GFP_KERNEL);
if (wsp == NULL) {
PRINT_ERROR("Unable to allocate ws_priv (size %zd, cmd %p)",
sizeof(*wsp), cmd);
goto out_busy;
}
mutex_init(&wsp->ws_mutex);
wsp->ws_finish_fn = scst_ws_write_cmd_finished;
wsp->ws_orig_cmd = cmd;
wsp->ws_descriptors = where;
wsp->ws_cur_descr = 0;
wsp->ws_cur_lba = where[0].sdd_lba;
wsp->ws_left_to_send = where[0].sdd_blocks;
wsp->ws_max_each = SCST_MAX_EACH_INTERNAL_IO_SIZE >> cmd->dev->block_shift;
if (scst_ws_sg_tails_get(where, wsp) == -ENOMEM)
goto out_busy;
if (cmd->bufflen <= PAGE_SIZE / 2)
pg = alloc_page(GFP_KERNEL);
if (pg) {
struct page *src_pg;
void *src, *dst;
int k;
mult = 0;
src_pg = sg_page(cmd->sg);
src = kmap(src_pg);
dst = kmap(pg);
for (k = 0; k < PAGE_SIZE; k += cmd->bufflen, mult++)
memcpy(dst + k, src + cmd->sg->offset, cmd->bufflen);
kunmap(pg);
kunmap(src_pg);
offset = 0;
length = k;
} else {
pg = sg_page(cmd->sg);
offset = cmd->sg->offset;
length = cmd->sg->length;
mult = 1;
}
if (wsp->ws_sg_full_cnt != 0) {
ws_sg_full_blocks = wsp->ws_sg_full_cnt;
wsp->ws_sg_full_cnt = (ws_sg_full_blocks + mult - 1) / mult;
TRACE_DBG("Allocating %d SGs", wsp->ws_sg_full_cnt);
rc = scst_ws_sg_init(&wsp->ws_sg_full, wsp->ws_sg_full_cnt, pg,
offset, length,
ws_sg_full_blocks << cmd->dev->block_shift);
if (rc != 0)
goto out_free;
}
for (i = 0; wsp->ws_descriptors[i].sdd_blocks != 0; i++) {
if (wsp->ws_sg_tails[i].sg_cnt != 0) {
ws_sg_tail_blocks = wsp->ws_sg_tails[i].sg_cnt;
wsp->ws_sg_tails[i].sg_cnt = (ws_sg_tail_blocks + mult - 1) / mult;
TRACE_DBG("Allocating %d tail SGs for descriptor[%d] ", wsp->ws_sg_tails[i].sg_cnt, i);
rc = scst_ws_sg_init(&wsp->ws_sg_tails[i].sg, wsp->ws_sg_tails[i].sg_cnt, pg,
offset, length,
ws_sg_tail_blocks << cmd->dev->block_shift);
if (rc != 0)
goto out_free;
}
}
if (scst_cmd_needs_dif_buf(cmd)) {
struct t10_pi_tuple *t;
struct scatterlist *tags_sg = NULL;
int tags_len = 0;
t = (struct t10_pi_tuple *)scst_get_dif_buf(cmd, &tags_sg, &tags_len);
wsp->app_tag = t->app_tag;
wsp->ref_tag = be32_to_cpu(t->ref_tag);
wsp->guard_tag = t->guard_tag;
wsp->dif_valid = 1;
switch (cmd->dev->dev_dif_type) {
case 1:
case 2:
wsp->inc_ref_tag = 1;
break;
case 3:
wsp->inc_ref_tag = 0;
break;
default:
sBUG();
break;
}
scst_put_dif_buf(cmd, t);
}
scst_ws_gen_writes(wsp);
out:
TRACE_EXIT();
return;
out_free:
if (pg && pg != sg_page(cmd->sg))
__free_page(pg);
kfree(wsp);
out_busy:
scst_set_busy(cmd);
out_done:
kfree(where);
cmd->scst_cmd_done(cmd, SCST_CMD_STATE_DEFAULT, SCST_CONTEXT_THREAD);
goto out;
}
EXPORT_SYMBOL_GPL(scst_write_same);
struct scst_cwr_priv {
/* Must be the first for scst_finish_internal_cmd()! */
scst_i_finish_fn_t cwr_finish_fn;
struct scst_cmd *cwr_orig_cmd;
};
static void scst_cwr_finished(struct scst_cwr_priv *cwrp)
{
struct scst_cmd *cwr_cmd = cwrp->cwr_orig_cmd;
TRACE_ENTRY();
TRACE_DBG("cwr cmd %p finished with status %d", cwr_cmd, cwr_cmd->status);
kfree(cwrp);
cwr_cmd->completed = 1; /* for success */
cwr_cmd->scst_cmd_done(cwr_cmd, SCST_CMD_STATE_DEFAULT, SCST_CONTEXT_THREAD);
TRACE_EXIT();
return;
}
static void scst_cwr_write_cmd_finished(struct scst_cmd *cmd)
{
struct scst_cwr_priv *cwrp = cmd->tgt_i_priv;
struct scst_cmd *cwr_cmd = cwrp->cwr_orig_cmd;
TRACE_ENTRY();
TRACE_DBG("WRITE cmd %p finished (cwr cmd %p)", cmd, cwr_cmd);
EXTRACHECKS_BUG_ON(cmd->cdb[0] != WRITE_16);
if (cmd->status != 0) {
int rc;
TRACE_DBG("WRITE cmd %p (cwr cmd %p) finished not successfully",
cmd, cwr_cmd);
sBUG_ON(cmd->resp_data_len != 0);
if (cmd->status == SAM_STAT_CHECK_CONDITION)
rc = scst_set_cmd_error_sense(cwr_cmd, cmd->sense,
cmd->sense_valid_len);
else {
sBUG_ON(cmd->sense != NULL);
rc = scst_set_cmd_error_status(cwr_cmd, cmd->status);
}
if (rc != 0) {
/* Requeue possible UA */
if (scst_is_ua_sense(cmd->sense, cmd->sense_valid_len))
scst_requeue_ua(cmd, NULL, 0);
}
}
scst_cwr_finished(cwrp);
TRACE_EXIT();
return;
}
static void scst_cwr_read_cmd_finished(struct scst_cmd *cmd)
{
struct scst_cwr_priv *cwrp = cmd->tgt_i_priv;
struct scst_cmd *cwr_cmd = cwrp->cwr_orig_cmd;
bool c, dif;
uint8_t write16_cdb[16];
struct scst_cmd *wcmd;
int data_len, miscompare_offs, rc;
TRACE_ENTRY();
TRACE_DBG("READ cmd %p finished (cwr cmd %p)", cmd, cwr_cmd);
if (cmd->status != 0) {
TRACE_DBG("Read cmd %p (cwr cmd %p) finished not successfully",
cmd, cwr_cmd);
sBUG_ON(cmd->resp_data_len != 0);
if (cmd->status == SAM_STAT_CHECK_CONDITION)
rc = scst_set_cmd_error_sense(cwr_cmd, cmd->sense,
cmd->sense_valid_len);
else {
sBUG_ON(cmd->sense != NULL);
rc = scst_set_cmd_error_status(cwr_cmd, cmd->status);
}
if (rc != 0) {
/* Requeue possible UA */
if (scst_is_ua_sense(cmd->sense, cmd->sense_valid_len))
scst_requeue_ua(cmd, NULL, 0);
}
goto out_finish;
}
if (unlikely(test_bit(SCST_CMD_ABORTED, &cwr_cmd->cmd_flags))) {
TRACE_MGMT_DBG("cwr cmd %p aborted", cwr_cmd);
goto out_finish;
}
c = sg_cmp(cmd->sg, cwr_cmd->sg, 0, 0, &miscompare_offs
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
, KM_USER0, KM_USER1
#endif
);
if (!c) {
scst_set_cmd_error_and_inf(cwr_cmd,
SCST_LOAD_SENSE(scst_sense_miscompare_error), miscompare_offs);
goto out_finish;
}
data_len = cwr_cmd->data_len;
/* We ignore the read PI checks as required by SBC */
rc = scst_dif_process_write(cmd);
if (unlikely(rc != 0))
goto out_finish;
memset(write16_cdb, 0, sizeof(write16_cdb));
write16_cdb[0] = WRITE_16;
write16_cdb[1] = cwr_cmd->cdb[1];
put_unaligned_be64(cwr_cmd->lba, &write16_cdb[2]);
put_unaligned_be32(data_len >> cmd->dev->block_shift, &write16_cdb[10]);
dif = scst_cmd_needs_dif_buf(cwr_cmd) && ((cwr_cmd->cdb[1] & 0xE0) != 0);
if (dif)
write16_cdb[1] |= cwr_cmd->cdb[1] & 0xE0;
wcmd = scst_create_prepare_internal_cmd(cwr_cmd, write16_cdb,
sizeof(write16_cdb), SCST_CMD_QUEUE_HEAD_OF_QUEUE);
if (wcmd == NULL)
goto out_busy;
wcmd->expected_data_direction = SCST_DATA_WRITE;
wcmd->expected_transfer_len_full = data_len;
if (dif)
wcmd->expected_transfer_len_full +=
data_len >> (cmd->dev->block_shift - SCST_DIF_TAG_SHIFT);
wcmd->expected_values_set = 1;
wcmd->tgt_i_priv = cwrp;
rc = scst_adjust_sg_get_tail(cwr_cmd, &wcmd->tgt_i_sg,
&wcmd->tgt_i_sg_cnt, &wcmd->tgt_i_dif_sg,
&wcmd->tgt_i_dif_sg_cnt, data_len, data_len);
/*
* It must not happen, because get_cdb_info_compare_and_write()
* supposed to ensure that.
*/
WARN_ONCE(rc != 0, "scst_adjust_sg_get_tail() failed: %d\n", rc);
wcmd->tgt_i_data_buf_alloced = 1;
cwrp->cwr_finish_fn = scst_cwr_write_cmd_finished;
TRACE_DBG("Adding WRITE(16) wcmd %p to head of active cmd list", wcmd);
spin_lock_irq(&wcmd->cmd_threads->cmd_list_lock);
list_add(&wcmd->cmd_list_entry, &wcmd->cmd_threads->active_cmd_list);
wake_up(&wcmd->cmd_threads->cmd_list_waitQ);
spin_unlock_irq(&wcmd->cmd_threads->cmd_list_lock);
out:
TRACE_EXIT();
return;
out_busy:
scst_set_busy(cwr_cmd);
out_finish:
scst_cwr_finished(cwrp);
goto out;
}
/*
* The Data-Out Buffer contains two instances of logical block data:
* 1) the compare instance, in which:
* A) the user data is used for the compare operation; and
* B) the protection information, if any, is not used;
* and
* 2) the write instance, in which:
* A) the user data is used for the write operations; and
* B) the protection information, if any, is used for the write operations.
*
* Note: cmd->data_len is half of the DataOut buffer size while cmd->bufflen
* and cmd->expected_transfer_len refer to the entire DataOut buffer.
*/
enum scst_exec_res scst_cmp_wr_local(struct scst_cmd *cmd)
{
enum scst_exec_res res = SCST_EXEC_COMPLETED;
struct scst_cwr_priv *cwrp;
uint8_t read16_cdb[16];
struct scst_cmd *rcmd;
const int data_len = cmd->data_len;
const uint32_t num_lbas = data_len >> cmd->dev->block_shift;
TRACE_ENTRY();
if (cmd->sess->sess_mq) {
PRINT_WARNING_ONCE("MQ session (%p) from initiator %s (tgt %s), "
"COMPARE AND WRITE not supported", cmd->sess,
cmd->sess->initiator_name, cmd->sess->tgt->tgt_name);
scst_set_cmd_error(cmd, SCST_LOAD_SENSE(scst_sense_invalid_opcode));
goto out_done;
}
/* COMPARE AND WRITE is SBC only command */
EXTRACHECKS_BUG_ON(cmd->dev->type != TYPE_DISK);
cmd->status = 0;
cmd->msg_status = 0;
cmd->host_status = DID_OK;
cmd->driver_status = 0;
if (unlikely(cmd->bufflen == 0)) {
TRACE(TRACE_MINOR, "Zero bufflen (cmd %p)", cmd);
goto out_done;
}
/* ToDo: HWALIGN'ed kmem_cache */
cwrp = kzalloc(sizeof(*cwrp), GFP_KERNEL);
if (cwrp == NULL) {
PRINT_ERROR("Unable to allocate cwr_priv (size %zd, cmd %p)",
sizeof(*cwrp), cmd);
goto out_busy;
}
cwrp->cwr_orig_cmd = cmd;
cwrp->cwr_finish_fn = scst_cwr_read_cmd_finished;
if (cmd->bufflen != scst_cmd_get_expected_transfer_len_data(cmd)) {
PRINT_ERROR("COMPARE AND WRITE: data buffer length mismatch (CDB %u <> ini %u)",
cmd->bufflen,
scst_cmd_get_expected_transfer_len_data(cmd));
scst_set_invalid_field_in_cdb(cmd, 13/*NLB*/, 0);
goto out_done;
}
/*
* As required by SBC, DIF PI, if any, is not checked for the read part
*/
memset(read16_cdb, 0, sizeof(read16_cdb));
read16_cdb[0] = READ_16;
read16_cdb[1] = cmd->cdb[1] & ~0xE0; /* as required, see above */
put_unaligned_be64(cmd->lba, &read16_cdb[2]);
put_unaligned_be32(num_lbas, &read16_cdb[10]);
rcmd = scst_create_prepare_internal_cmd(cmd, read16_cdb,
sizeof(read16_cdb), SCST_CMD_QUEUE_HEAD_OF_QUEUE);
if (rcmd == NULL) {
res = -ENOMEM;
goto out_free;
}
rcmd->expected_data_direction = SCST_DATA_READ;
rcmd->expected_transfer_len_full = data_len;
rcmd->expected_values_set = 1;
rcmd->tgt_i_priv = cwrp;
TRACE_DBG("Adding READ(16) cmd %p to head of active cmd list", rcmd);
spin_lock_irq(&rcmd->cmd_threads->cmd_list_lock);
list_add(&rcmd->cmd_list_entry, &rcmd->cmd_threads->active_cmd_list);
wake_up(&rcmd->cmd_threads->cmd_list_waitQ);
spin_unlock_irq(&rcmd->cmd_threads->cmd_list_lock);
out:
TRACE_EXIT_RES(res);
return res;
out_free:
kfree(cwrp);
out_busy:
scst_set_busy(cmd);
out_done:
cmd->scst_cmd_done(cmd, SCST_CMD_STATE_DEFAULT, SCST_CONTEXT_THREAD);
goto out;
}
int scst_finish_internal_cmd(struct scst_cmd *cmd)
{
struct scst_icmd_priv *icmd_priv = cmd->tgt_i_priv;
unsigned long flags;
int res;
TRACE_ENTRY();
sBUG_ON(!cmd->internal);
if (scst_cmd_atomic(cmd)) {
TRACE_DBG("Rescheduling finished internal atomic cmd %p in a "
"thread context", cmd);
res = SCST_CMD_STATE_RES_NEED_THREAD;
goto out;
}
spin_lock_irqsave(&cmd->sess->sess_list_lock, flags);
list_del(&cmd->sess_cmd_list_entry);
cmd->done = 1;
cmd->finished = 1;
spin_unlock_irqrestore(&cmd->sess->sess_list_lock, flags);
if (unlikely(test_bit(SCST_CMD_ABORTED, &cmd->cmd_flags))) {
scst_done_cmd_mgmt(cmd);
scst_finish_cmd_mgmt(cmd);
}
icmd_priv->finish_fn(cmd);
__scst_cmd_put(cmd);
res = SCST_CMD_STATE_RES_CONT_NEXT;
out:
TRACE_EXIT_HRES(res);
return res;
}
static void scst_send_release(struct scst_device *dev)
{
struct scsi_device *scsi_dev;
unsigned char cdb[6];
uint8_t sense[SCSI_SENSE_BUFFERSIZE];
int rc, i;
TRACE_ENTRY();
if (dev->scsi_dev == NULL)
goto out;
scsi_dev = dev->scsi_dev;
for (i = 0; i < 5; i++) {
memset(cdb, 0, sizeof(cdb));
cdb[0] = RELEASE;
cdb[1] = (scsi_dev->scsi_level <= SCSI_2) ?
((scsi_dev->lun << 5) & 0xe0) : 0;
memset(sense, 0, sizeof(sense));
TRACE(TRACE_DEBUG | TRACE_SCSI, "%s", "Sending RELEASE req to "
"SCSI mid-level");
rc = scst_scsi_execute(scsi_dev, cdb, SCST_DATA_NONE, NULL, 0,
sense, 15, 0, 0);
TRACE_DBG("RELEASE done: %x", rc);
if (scsi_status_is_good(rc)) {
break;
} else {
PRINT_ERROR("RELEASE failed: %d", rc);
PRINT_BUFFER("RELEASE sense", sense, sizeof(sense));
scst_check_internal_sense(dev, rc, sense,
sizeof(sense));
}
}
out:
TRACE_EXIT();
return;
}
/* scst_mutex supposed to be held */
static void scst_clear_reservation(struct scst_tgt_dev *tgt_dev)
{
struct scst_device *dev = tgt_dev->dev;
struct scst_lksb pr_lksb;
int release = 0;
TRACE_ENTRY();
scst_res_lock(dev, &pr_lksb);
if (scst_is_reservation_holder(dev, tgt_dev->sess)) {
/* This is one who holds the reservation */
scst_clear_dev_reservation(dev);
release = 1;
}
scst_res_unlock(dev, &pr_lksb);
if (release)
scst_send_release(dev);
TRACE_EXIT();
return;
}
static void scst_sess_release(struct percpu_ref *ref)
{
struct scst_session *sess = container_of(ref, typeof(*sess), refcnt);
scst_sched_session_free(sess);
}
struct scst_session *scst_alloc_session(struct scst_tgt *tgt, gfp_t gfp_mask,
const char *initiator_name)
{
struct scst_session *sess;
int i, ret;
TRACE_ENTRY();
sess = kmem_cache_zalloc(scst_sess_cachep, gfp_mask);
if (sess == NULL) {
PRINT_ERROR("%s", "Allocation of scst_session failed");
goto out;
}
sess->init_phase = SCST_SESS_IPH_INITING;
sess->shut_phase = SCST_SESS_SPH_READY;
ret = percpu_ref_init(&sess->refcnt, scst_sess_release, 0, gfp_mask);
if (ret < 0)
goto out_free;
mutex_init(&sess->tgt_dev_list_mutex);
for (i = 0; i < SESS_TGT_DEV_LIST_HASH_SIZE; i++) {
struct list_head *head = &sess->sess_tgt_dev_list[i];
INIT_LIST_HEAD(head);
}
spin_lock_init(&sess->sess_list_lock);
INIT_LIST_HEAD(&sess->sess_cmd_list);
sess->tgt = tgt;
INIT_LIST_HEAD(&sess->init_deferred_cmd_list);
INIT_LIST_HEAD(&sess->init_deferred_mcmd_list);
INIT_LIST_HEAD(&sess->sess_cm_list_id_list);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20)
INIT_DELAYED_WORK(&sess->sess_cm_list_id_cleanup_work,
sess_cm_list_id_cleanup_work_fn);
INIT_DELAYED_WORK(&sess->hw_pending_work, scst_hw_pending_work_fn);
#else
INIT_WORK(&sess->sess_cm_list_id_cleanup_work,
sess_cm_list_id_cleanup_work_fn, sess);
INIT_WORK(&sess->hw_pending_work, scst_hw_pending_work_fn, sess);
#endif
spin_lock_init(&sess->lat_stats_lock);
sess->initiator_name = kstrdup(initiator_name, gfp_mask);
if (sess->initiator_name == NULL) {
PRINT_ERROR("%s", "Unable to dup sess->initiator_name");
goto out_free_refcnt;
}
if (atomic_read(&scst_measure_latency)) {
/*
* To do: remove higher order allocation from the code below
* for the GFP_ATOMIC case.
*/
sess->lat_stats = gfp_mask & GFP_ATOMIC ?
kzalloc(sizeof(*sess->lat_stats), gfp_mask) :
vzalloc(sizeof(*sess->lat_stats));
if (!sess->lat_stats)
goto out_free_name;
}
out:
TRACE_EXIT();
return sess;
out_free_name:
kfree(sess->initiator_name);
out_free_refcnt:
percpu_ref_exit(&sess->refcnt);
out_free:
kmem_cache_free(scst_sess_cachep, sess);
sess = NULL;
goto out;
}
void scst_free_session(struct scst_session *sess)
{
TRACE_ENTRY();
mutex_lock(&scst_mutex);
scst_sess_free_tgt_devs(sess);
TRACE_DBG("Removing sess %p from the list", sess);
list_del(&sess->sess_list_entry);
TRACE_DBG("Removing session %p from acg %s", sess, sess->acg->acg_name);
list_del(&sess->acg_sess_list_entry);
scst_put_acg(sess->acg);
mutex_unlock(&scst_mutex);
scst_sess_sysfs_del(sess);
if (sess->unreg_done_fn) {
TRACE_DBG("Calling unreg_done_fn(%p)", sess);
sess->unreg_done_fn(sess);
TRACE_DBG("%s", "unreg_done_fn() returned");
}
mutex_lock(&scst_mutex);
list_del(&sess->sysfs_sess_list_entry);
/* Called under lock to protect from too early tgt release */
wake_up_all(&sess->tgt->unreg_waitQ);
/*
* NOTE: do not dereference the sess->tgt pointer after scst_mutex
* has been unlocked, because it can be already dead!!
*/
mutex_unlock(&scst_mutex);
kfree(sess->transport_id);
kvfree(sess->lat_stats);
kfree(sess->initiator_name);
if (sess->sess_name != sess->initiator_name)
kfree(sess->sess_name);
percpu_ref_exit(&sess->refcnt);
kmem_cache_free(scst_sess_cachep, sess);
TRACE_EXIT();
return;
}
void scst_free_session_callback(struct scst_session *sess)
{
struct completion *c;
TRACE_ENTRY();
TRACE_DBG("Freeing session %p", sess);
cancel_delayed_work_sync(&sess->hw_pending_work);
c = sess->shutdown_compl;
mutex_lock(&scst_mutex);
/*
* Necessary to sync with other threads trying to queue AEN, which
* the target driver will not be able to serve and crash, because after
* unreg_done_fn() called its internal session data will be destroyed.
*/
sess->shut_phase = SCST_SESS_SPH_UNREG_DONE_CALLING;
mutex_unlock(&scst_mutex);
scst_free_session(sess);
if (c)
complete_all(c);
TRACE_EXIT();
return;
}
void scst_sched_session_free(struct scst_session *sess)
{
unsigned long flags;
TRACE_ENTRY();
if (sess->shut_phase != SCST_SESS_SPH_SHUTDOWN) {
PRINT_CRIT_ERROR("session %p is going to shutdown with unknown "
"shut phase %lx", sess, sess->shut_phase);
sBUG();
}
spin_lock_irqsave(&scst_mgmt_lock, flags);
TRACE_DBG("Adding sess %p to scst_sess_shut_list", sess);
list_add_tail(&sess->sess_shut_list_entry, &scst_sess_shut_list);
spin_unlock_irqrestore(&scst_mgmt_lock, flags);
wake_up(&scst_mgmt_waitQ);
TRACE_EXIT();
return;
}
/*
* scst_cmd_get() - increase command's reference counter
*/
void scst_cmd_get(struct scst_cmd *cmd)
{
__scst_cmd_get(cmd);
}
EXPORT_SYMBOL(scst_cmd_get);
/*
* scst_cmd_put() - decrease command's reference counter
*/
void scst_cmd_put(struct scst_cmd *cmd)
{
__scst_cmd_put(cmd);
}
EXPORT_SYMBOL(scst_cmd_put);
/*
* scst_cmd_set_ext_cdb() - sets cmd's extended CDB and its length
*/
void scst_cmd_set_ext_cdb(struct scst_cmd *cmd,
uint8_t *ext_cdb, unsigned int ext_cdb_len,
gfp_t gfp_mask)
{
unsigned int len = cmd->cdb_len + ext_cdb_len;
TRACE_ENTRY();
if (len <= sizeof(cmd->cdb_buf))
goto copy;
if (unlikely(len > SCST_MAX_LONG_CDB_SIZE)) {
PRINT_ERROR("Too big CDB (%d)", len);
scst_set_cmd_error(cmd,
SCST_LOAD_SENSE(scst_sense_hardw_error));
goto out;
}
/* It's read-mostly, so cache alignment isn't needed */
cmd->cdb = kmalloc(len, gfp_mask);
if (unlikely(cmd->cdb == NULL)) {
PRINT_ERROR("Unable to alloc extended CDB (size %d)", len);
goto out_err;
}
memcpy(cmd->cdb, cmd->cdb_buf, cmd->cdb_len);
copy:
memcpy(&cmd->cdb[cmd->cdb_len], ext_cdb, ext_cdb_len);
cmd->cdb_len = cmd->cdb_len + ext_cdb_len;
out:
TRACE_EXIT();
return;
out_err:
cmd->cdb = cmd->cdb_buf;
scst_set_busy(cmd);
goto out;
}
EXPORT_SYMBOL(scst_cmd_set_ext_cdb);
int scst_pre_init_cmd(struct scst_cmd *cmd, const uint8_t *cdb,
unsigned int cdb_len, gfp_t gfp_mask)
{
int res;
TRACE_ENTRY();
#ifdef CONFIG_SCST_EXTRACHECKS
/* cmd supposed to be zeroed */
{
int i;
uint8_t *b = (uint8_t *)cmd;
for (i = 0; i < sizeof(*cmd); i++)
EXTRACHECKS_BUG_ON(b[i] != 0);
}
#endif
scst_set_cmd_state(cmd, SCST_CMD_STATE_INIT_WAIT);
cmd->start_time = jiffies;
atomic_set(&cmd->cmd_ref, 1);
cmd->cmd_threads = &scst_main_cmd_threads;
cmd->cmd_gfp_mask = GFP_KERNEL;
INIT_LIST_HEAD(&cmd->mgmt_cmd_list);
cmd->cdb = cmd->cdb_buf;
cmd->queue_type = SCST_CMD_QUEUE_SIMPLE;
cmd->timeout = SCST_DEFAULT_TIMEOUT;
cmd->retries = 0;
#ifdef CONFIG_SCST_EXTRACHECKS
/* To ensure they are inited */
cmd->lba = SCST_DEF_LBA_DATA_LEN;
cmd->data_len = SCST_DEF_LBA_DATA_LEN;
#endif
cmd->is_send_status = 1;
cmd->resp_data_len = -1;
cmd->write_sg = &cmd->sg;
cmd->write_sg_cnt = &cmd->sg_cnt;
cmd->dbl_ua_orig_data_direction = SCST_DATA_UNKNOWN;
cmd->dbl_ua_orig_resp_data_len = -1;
if (unlikely(cdb_len == 0)) {
PRINT_ERROR("%s", "Wrong CDB len 0, finishing cmd");
res = -EINVAL;
goto out;
} else if (cdb_len <= SCST_MAX_CDB_SIZE) {
/* Duplicate memcpy to save a branch on the most common path */
memcpy(cmd->cdb, cdb, cdb_len);
} else {
if (unlikely(cdb_len > SCST_MAX_LONG_CDB_SIZE)) {
PRINT_ERROR("Too big CDB (%d), finishing cmd", cdb_len);
res = -EINVAL;
goto out;
}
/* It's read-mostly, so cache alignment isn't needed */
cmd->cdb = kmalloc(cdb_len, gfp_mask);
if (unlikely(cmd->cdb == NULL)) {
PRINT_ERROR("Unable to alloc extended CDB (size %d)",
cdb_len);
res = -ENOMEM;
goto out;
}
memcpy(cmd->cdb, cdb, cdb_len);
}
cmd->cdb_len = cdb_len;
res = 0;
out:
TRACE_EXIT_RES(res);
return res;
}
struct scst_cmd *scst_alloc_cmd(const uint8_t *cdb,
unsigned int cdb_len, gfp_t gfp_mask)
{
struct scst_cmd *cmd;
int rc;
TRACE_ENTRY();
cmd = kmem_cache_zalloc(scst_cmd_cachep, gfp_mask);
if (cmd == NULL) {
TRACE(TRACE_OUT_OF_MEM, "%s", "Allocation of scst_cmd failed");
goto out;
}
rc = scst_pre_init_cmd(cmd, cdb, cdb_len, gfp_mask);
if (unlikely(rc != 0))
goto out_free;
out:
TRACE_EXIT();
return cmd;
out_free:
kmem_cache_free(scst_cmd_cachep, cmd);
cmd = NULL;
goto out;
}
static void scst_destroy_cmd(struct scst_cmd *cmd)
{
bool pre_alloced = cmd->pre_alloced;
TRACE_ENTRY();
TRACE_DBG("Destroying cmd %p", cmd);
scst_sess_put(cmd->sess);
if (likely(cmd->cpu_cmd_counter)) {
scst_put(cmd->cpu_cmd_counter);
cmd->cpu_cmd_counter = NULL;
}
EXTRACHECKS_BUG_ON(cmd->pre_alloced && cmd->internal);
if ((cmd->tgtt->on_free_cmd != NULL) && likely(!cmd->internal)) {
TRACE_DBG("Calling target's on_free_cmd(%p)", cmd);
cmd->tgtt->on_free_cmd(cmd);
TRACE_DBG("%s", "Target's on_free_cmd() returned");
}
/* At this point cmd can be already freed! */
if (!pre_alloced)
kmem_cache_free(scst_cmd_cachep, cmd);
TRACE_EXIT();
return;
}
/* No locks */
void scst_stpg_del_unblock_next(struct scst_cmd *cmd)
{
struct scst_cmd *c;
TRACE_ENTRY();
spin_lock_irq(&scst_global_stpg_list_lock);
EXTRACHECKS_BUG_ON(!cmd->cmd_on_global_stpg_list);
TRACE_DBG("STPG cmd %p done: unblocking next", cmd);
list_del(&cmd->global_stpg_list_entry);
cmd->cmd_on_global_stpg_list = 0;
if (list_empty(&scst_global_stpg_list)) {
TRACE_DBG("No more STPG commands to unblock");
spin_unlock_irq(&scst_global_stpg_list_lock);
goto out;
}
c = list_first_entry(&scst_global_stpg_list, typeof(*c),
global_stpg_list_entry);
spin_unlock_irq(&scst_global_stpg_list_lock);
spin_lock_bh(&c->dev->dev_lock);
if (!c->cmd_global_stpg_blocked) {
TRACE_DBG("STPG cmd %p is not cmd_global_stpg_blocked", c);
spin_unlock_bh(&c->dev->dev_lock);
goto out;
}
TRACE_BLOCK("Unblocking serialized STPG cmd %p", c);
list_del(&c->blocked_cmd_list_entry);
c->cmd_global_stpg_blocked = 0;
spin_unlock_bh(&c->dev->dev_lock);
spin_lock_irq(&c->cmd_threads->cmd_list_lock);
list_add(&c->cmd_list_entry,
&c->cmd_threads->active_cmd_list);
wake_up(&c->cmd_threads->cmd_list_waitQ);
spin_unlock_irq(&c->cmd_threads->cmd_list_lock);
out:
TRACE_EXIT();
return;
}
EXPORT_SYMBOL_GPL(scst_stpg_del_unblock_next);
/* No locks supposed to be held */
void scst_free_cmd(struct scst_cmd *cmd)
{
int destroy = 1;
TRACE_ENTRY();
TRACE_DBG("Freeing cmd %p (tag %llu)",
cmd, (unsigned long long)cmd->tag);
if (unlikely(test_bit(SCST_CMD_ABORTED, &cmd->cmd_flags)))
TRACE_MGMT_DBG("Freeing aborted cmd %p", cmd);
EXTRACHECKS_BUG_ON(cmd->unblock_dev || cmd->dec_on_dev_needed ||
cmd->on_dev_exec_list);
/*
* Target driver can already free sg buffer before calling
* scst_tgt_cmd_done(). E.g., scst_local has to do that.
*/
if (!cmd->tgt_i_data_buf_alloced)
scst_check_restore_sg_buff(cmd);
if (likely(cmd->dev != NULL)) {
struct scst_dev_type *devt = cmd->devt;
if (devt->on_free_cmd != NULL) {
TRACE_DBG("Calling dev handler %s on_free_cmd(%p)",
devt->name, cmd);
devt->on_free_cmd(cmd);
TRACE_DBG("Dev handler %s on_free_cmd() returned",
devt->name);
}
}
scst_release_space(cmd);
if (unlikely(cmd->sense != NULL)) {
TRACE_MEM("Releasing sense %p (cmd %p)", cmd->sense, cmd);
mempool_free(cmd->sense, scst_sense_mempool);
cmd->sense = NULL;
}
if (likely(cmd->tgt_dev != NULL)) {
EXTRACHECKS_BUG_ON(cmd->sn_set && !cmd->out_of_sn &&
!test_bit(SCST_CMD_INC_EXPECTED_SN_PASSED, &cmd->cmd_flags));
if (unlikely(cmd->out_of_sn)) {
destroy = test_and_set_bit(SCST_CMD_CAN_BE_DESTROYED,
&cmd->cmd_flags);
TRACE_SN("Out of SN cmd %p (tag %llu, sn %d), "
"destroy=%d", cmd,
(unsigned long long)cmd->tag,
cmd->sn, destroy);
}
}
if (unlikely(cmd->op_flags & SCST_DESCRIPTORS_BASED))
scst_free_descriptors(cmd);
if (cmd->cdb != cmd->cdb_buf)
kfree(cmd->cdb);
if (likely(destroy))
scst_destroy_cmd(cmd);
TRACE_EXIT();
return;
}
/* No locks supposed to be held. */
void scst_check_retries(struct scst_tgt *tgt)
{
int need_wake_up = 0;
TRACE_ENTRY();
if (unlikely(tgt->retry_cmds > 0)) {
struct scst_cmd *c, *tc;
unsigned long flags;
TRACE_RETRY("Checking retry cmd list (retry_cmds %d)",
tgt->retry_cmds);
spin_lock_irqsave(&tgt->tgt_lock, flags);
list_for_each_entry_safe(c, tc, &tgt->retry_cmd_list,
cmd_list_entry) {
tgt->retry_cmds--;
TRACE_RETRY("Moving retry cmd %p to head of active "
"cmd list (retry_cmds left %d)",
c, tgt->retry_cmds);
spin_lock(&c->cmd_threads->cmd_list_lock);
list_move(&c->cmd_list_entry,
&c->cmd_threads->active_cmd_list);
wake_up(&c->cmd_threads->cmd_list_waitQ);
spin_unlock(&c->cmd_threads->cmd_list_lock);
need_wake_up++;
if (need_wake_up >= 20) /* "slow start" */
break;
}
spin_unlock_irqrestore(&tgt->tgt_lock, flags);
}
TRACE_EXIT();
return;
}
static void scst_tgt_retry_timer_fn(struct timer_list *timer)
{
struct scst_tgt *tgt = container_of(timer, typeof(*tgt), retry_timer);
unsigned long flags;
TRACE_RETRY("Retry timer expired (retry_cmds %d)", tgt->retry_cmds);
spin_lock_irqsave(&tgt->tgt_lock, flags);
tgt->retry_timer_active = 0;
spin_unlock_irqrestore(&tgt->tgt_lock, flags);
scst_check_retries(tgt);
spin_lock_irqsave(&tgt->tgt_lock, flags);
if ((tgt->retry_cmds > 0) && !tgt->retry_timer_active) {
TRACE_DBG("Reactivating retry timer for tgt %p", tgt);
tgt->retry_timer.expires = jiffies + SCST_TGT_RETRY_TIMEOUT;
add_timer(&tgt->retry_timer);
tgt->retry_timer_active = 1;
}
spin_unlock_irqrestore(&tgt->tgt_lock, flags);
TRACE_EXIT();
return;
}
struct scst_mgmt_cmd *scst_alloc_mgmt_cmd(gfp_t gfp_mask)
{
struct scst_mgmt_cmd *mcmd;
TRACE_ENTRY();
mcmd = mempool_alloc(scst_mgmt_mempool, gfp_mask);
if (mcmd == NULL) {
PRINT_CRIT_ERROR("%s", "Allocation of management command "
"failed, some commands and their data could leak");
goto out;
}
memset(mcmd, 0, sizeof(*mcmd));
mcmd->status = SCST_MGMT_STATUS_SUCCESS;
out:
TRACE_EXIT();
return mcmd;
}
void scst_free_mgmt_cmd(struct scst_mgmt_cmd *mcmd)
{
unsigned long flags;
TRACE_ENTRY();
spin_lock_irqsave(&mcmd->sess->sess_list_lock, flags);
atomic_dec(&mcmd->sess->sess_cmd_count);
spin_unlock_irqrestore(&mcmd->sess->sess_list_lock, flags);
scst_sess_put(mcmd->sess);
if (mcmd->cpu_cmd_counter) {
scst_put(mcmd->cpu_cmd_counter);
mcmd->cpu_cmd_counter = NULL;
}
mempool_free(mcmd, scst_mgmt_mempool);
TRACE_EXIT();
return;
}
static bool scst_on_sg_tablesize_low(struct scst_cmd *cmd, bool out)
{
bool res;
int sg_cnt = out ? cmd->out_sg_cnt : cmd->sg_cnt;
static int ll;
struct scst_tgt_dev *tgt_dev = cmd->tgt_dev;
TRACE_ENTRY();
if (sg_cnt > cmd->tgt->sg_tablesize) {
/* It's the target's side business */
goto failed;
}
if (cmd->devt->on_sg_tablesize_low == NULL)
goto failed;
res = cmd->devt->on_sg_tablesize_low(cmd);
TRACE_DBG("on_sg_tablesize_low(%p) returned %d", cmd, res);
out:
TRACE_EXIT_RES(res);
return res;
failed:
res = false;
if ((ll < 10) || TRACING_MINOR()) {
PRINT_INFO("Unable to complete command due to SG IO count "
"limitation (%srequested %d, available %d, tgt lim %d)",
out ? "OUT buffer, " : "", cmd->sg_cnt,
tgt_dev->max_sg_cnt, cmd->tgt->sg_tablesize);
ll++;
}
goto out;
}
static void scst_restore_dif_sg(struct scst_cmd *cmd)
{
int left = cmd->bufflen;
struct scatterlist *sg = cmd->dif_sg;
TRACE_ENTRY();
if (!cmd->dif_sg_normalized)
goto out;
do {
sg->length = min_t(int, PAGE_SIZE, left);
left -= sg->length;
TRACE_DBG("DIF sg %p, restored len %d (left %d)", sg,
sg->length, left);
/* sg might be last here */
sg = sg_next_inline(sg);
} while (left > 0);
out:
TRACE_EXIT();
return;
}
int scst_alloc_space(struct scst_cmd *cmd)
{
gfp_t gfp_mask;
int res = -ENOMEM;
int atomic = scst_cmd_atomic(cmd);
int flags;
struct scst_tgt_dev *tgt_dev = cmd->tgt_dev;
TRACE_ENTRY();
gfp_mask = tgt_dev->tgt_dev_gfp_mask | (atomic ? GFP_ATOMIC : cmd->cmd_gfp_mask);
flags = atomic ? SGV_POOL_NO_ALLOC_ON_CACHE_MISS : 0;
if (cmd->no_sgv)
flags |= SGV_POOL_ALLOC_NO_CACHED;
cmd->sg = sgv_pool_alloc(tgt_dev->pools[raw_smp_processor_id()],
cmd->bufflen, gfp_mask, flags, &cmd->sg_cnt, &cmd->sgv,
&cmd->dev->dev_mem_lim, NULL);
if (unlikely(cmd->sg == NULL))
goto out;
if (unlikely(cmd->sg_cnt > tgt_dev->max_sg_cnt))
if (!scst_on_sg_tablesize_low(cmd, false))
goto out_sg_free;
if ((scst_get_dif_action(scst_get_scst_dif_actions(cmd->cmd_dif_actions)) != SCST_DIF_ACTION_NONE) ||
(scst_get_dif_action(scst_get_dev_dif_actions(cmd->cmd_dif_actions)) != SCST_DIF_ACTION_NONE)) {
int dif_bufflen;
bool same_layout;
same_layout = tgt_dev->hw_dif_same_sg_layout_required;
if (!same_layout)
dif_bufflen = __scst_cmd_get_bufflen_dif(cmd);
else
dif_bufflen = cmd->bufflen;
cmd->dif_sg = sgv_pool_alloc(tgt_dev->pools[raw_smp_processor_id()],
dif_bufflen, gfp_mask, flags, &cmd->dif_sg_cnt, &cmd->dif_sgv,
&cmd->dev->dev_mem_lim, NULL);
if (unlikely(cmd->dif_sg == NULL))
goto out_sg_free;
if (same_layout) {
int left = dif_bufflen;
struct scatterlist *sgd = cmd->sg;
struct scatterlist *sgt = cmd->dif_sg;
int block_shift = cmd->dev->block_shift;
EXTRACHECKS_BUG_ON(left != cmd->bufflen);
do {
left -= sgt->length;
sgt->length = (sgd->length >> block_shift) << SCST_DIF_TAG_SHIFT;
TRACE_SG("sgt %p, new len %d", sgt, sgt->length);
/* sgd/sgt might be last here */
sgd = sg_next_inline(sgd);
sgt = sg_next_inline(sgt);
} while (left > 0);
cmd->dif_sg_normalized = 1;
}
}
if (cmd->data_direction != SCST_DATA_BIDI)
goto success;
cmd->out_sg = sgv_pool_alloc(tgt_dev->pools[raw_smp_processor_id()],
cmd->out_bufflen, gfp_mask, flags, &cmd->out_sg_cnt,
&cmd->out_sgv, &cmd->dev->dev_mem_lim, NULL);
if (unlikely(cmd->out_sg == NULL))
goto out_dif_sg_free;
if (unlikely(cmd->out_sg_cnt > tgt_dev->max_sg_cnt))
if (!scst_on_sg_tablesize_low(cmd, true))
goto out_out_sg_free;
success:
res = 0;
out:
TRACE_EXIT();
return res;
out_out_sg_free:
sgv_pool_free(cmd->out_sgv, &cmd->dev->dev_mem_lim);
cmd->out_sgv = NULL;
cmd->out_sg = NULL;
cmd->out_sg_cnt = 0;
out_dif_sg_free:
if (cmd->dif_sgv != NULL) {
scst_restore_dif_sg(cmd);
sgv_pool_free(cmd->dif_sgv, &cmd->dev->dev_mem_lim);
cmd->dif_sgv = NULL;
cmd->dif_sg = NULL;
cmd->dif_sg_cnt = 0;
}
out_sg_free:
sgv_pool_free(cmd->sgv, &cmd->dev->dev_mem_lim);
cmd->sgv = NULL;
cmd->sg = NULL;
cmd->sg_cnt = 0;
goto out;
}
static void scst_release_space(struct scst_cmd *cmd)
{
TRACE_ENTRY();
if (cmd->sgv == NULL) {
if ((cmd->sg != NULL) &&
!(cmd->tgt_i_data_buf_alloced || cmd->dh_data_buf_alloced)) {
TRACE_MEM("Freeing sg %p for cmd %p (cnt %d)", cmd->sg,
cmd, cmd->sg_cnt);
scst_free_sg(cmd->sg, cmd->sg_cnt);
goto out_zero;
} else
goto out;
}
if (cmd->tgt_i_data_buf_alloced || cmd->dh_data_buf_alloced) {
TRACE_MEM("%s", "*data_buf_alloced set, returning");
goto out;
}
if (cmd->out_sgv != NULL) {
sgv_pool_free(cmd->out_sgv, &cmd->dev->dev_mem_lim);
cmd->out_sgv = NULL;
cmd->out_sg_cnt = 0;
cmd->out_sg = NULL;
cmd->out_bufflen = 0;
}
if (cmd->dif_sgv != NULL) {
scst_restore_dif_sg(cmd);
sgv_pool_free(cmd->dif_sgv, &cmd->dev->dev_mem_lim);
}
sgv_pool_free(cmd->sgv, &cmd->dev->dev_mem_lim);
out_zero:
cmd->sgv = NULL;
cmd->sg_cnt = 0;
cmd->sg = NULL;
cmd->dif_sgv = NULL;
cmd->dif_sg = NULL;
cmd->dif_sg_cnt = 0;
cmd->bufflen = 0;
cmd->data_len = 0;
out:
TRACE_EXIT();
return;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30)
struct blk_kern_sg_work {
atomic_t bios_inflight;
struct sg_table sg_table;
struct scatterlist *src_sgl;
};
static void blk_free_kern_sg_work(struct blk_kern_sg_work *bw)
{
struct sg_table *sgt = &bw->sg_table;
struct scatterlist *sg;
struct page *pg;
int i;
for_each_sg(sgt->sgl, sg, sgt->orig_nents, i) {
pg = sg_page(sg);
if (pg == NULL)
break;
__free_page(pg);
}
sg_free_table(sgt);
kfree(bw);
return;
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0)
static void blk_bio_map_kern_endio(struct bio *bio, int err)
{
#else
static void blk_bio_map_kern_endio(struct bio *bio)
{
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0) && \
!defined(CONFIG_SUSE_KERNEL)
int err = bio->bi_error;
#else
int err = blk_status_to_errno(bio->bi_status);
#endif
#endif
struct blk_kern_sg_work *bw = bio->bi_private;
if (bw != NULL) {
/* Decrement the bios in processing and, if zero, free */
BUG_ON(atomic_read(&bw->bios_inflight) <= 0);
if (atomic_dec_and_test(&bw->bios_inflight)) {
if (bio_data_dir(bio) == READ && err == 0) {
unsigned long flags;
local_irq_save(flags); /* to protect KMs */
sg_copy(bw->src_sgl, bw->sg_table.sgl, 0, 0
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
, KM_BIO_DST_IRQ, KM_BIO_SRC_IRQ
#endif
);
local_irq_restore(flags);
}
blk_free_kern_sg_work(bw);
}
}
bio_put(bio);
return;
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 31)
/*
* See also patch "block: Add blk_make_request(), takes bio, returns a
* request" (commit 79eb63e9e5875b84341a3a05f8e6ae9cdb4bb6f6).
*/
static struct request *blk_make_request(struct request_queue *q,
struct bio *bio,
gfp_t gfp_mask)
{
struct request *rq = blk_get_request(q, bio_data_dir(bio), gfp_mask);
if (unlikely(!rq))
return ERR_PTR(-ENOMEM);
rq->cmd_type = REQ_TYPE_BLOCK_PC;
for ( ; bio; bio = bio->bi_next) {
struct bio *bounce_bio = bio;
int ret;
blk_queue_bounce(q, &bounce_bio);
ret = blk_rq_append_bio(q, rq, bounce_bio);
if (unlikely(ret)) {
blk_put_request(rq);
return ERR_PTR(ret);
}
}
return rq;
}
#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 31) */
/*
* Copy an sg-list. This function is related to bio_copy_kern() but duplicates
* an sg-list instead of creating a bio out of a single kernel address range.
*/
static struct blk_kern_sg_work *blk_copy_kern_sg(struct request_queue *q,
struct scatterlist *sgl, int nents, gfp_t gfp_mask, bool reading)
{
int res = 0, i;
struct scatterlist *sg;
struct scatterlist *new_sgl;
int new_sgl_nents;
size_t len = 0, to_copy;
struct blk_kern_sg_work *bw;
res = -ENOMEM;
bw = kzalloc(sizeof(*bw), gfp_mask);
if (bw == NULL)
goto err;
bw->src_sgl = sgl;
for_each_sg(sgl, sg, nents, i)
len += sg->length;
to_copy = len;
new_sgl_nents = PFN_UP(len);
res = sg_alloc_table(&bw->sg_table, new_sgl_nents, gfp_mask);
if (res != 0)
goto err_free_bw;
new_sgl = bw->sg_table.sgl;
res = -ENOMEM;
for_each_sg(new_sgl, sg, new_sgl_nents, i) {
struct page *pg;
pg = alloc_page(q->bounce_gfp | gfp_mask);
if (pg == NULL)
goto err_free_table;
sg_assign_page(sg, pg);
sg->length = min_t(size_t, PAGE_SIZE, len);
len -= PAGE_SIZE;
}
if (!reading) {
/*
* We need to limit amount of copied data to to_copy, because
* sgl might have the last element in sgl not marked as last in
* SG chaining.
*/
sg_copy(new_sgl, sgl, 0, to_copy
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
, KM_USER0, KM_USER1
#endif
);
}
out:
return bw;
err_free_table:
sg_free_table(&bw->sg_table);
err_free_bw:
blk_free_kern_sg_work(bw);
err:
sBUG_ON(res == 0);
bw = ERR_PTR(res);
goto out;
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 28)
static void bio_kmalloc_destructor(struct bio *bio)
{
kfree(bio->bi_io_vec);
kfree(bio);
}
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 18, 0)
static blk_mq_req_flags_t gfp_mask_to_flags(gfp_t gfp_mask)
{
switch (gfp_mask) {
case GFP_KERNEL:
return 0;
case GFP_ATOMIC:
case GFP_NOIO:
return BLK_MQ_REQ_NOWAIT;
default:
WARN_ONCE(true, "gfp_mask = %#x\n", gfp_mask);
}
return 0;
}
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 8, 0) || \
(defined(CONFIG_SUSE_KERNEL) && LINUX_VERSION_CODE >= KERNEL_VERSION(4, 4, 0))
static struct request *blk_make_request(struct request_queue *q,
struct bio *bio,
gfp_t gfp_mask)
{
struct request *rq;
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 11, 0)
rq = blk_get_request(q, bio_data_dir(bio), gfp_mask);
#elif LINUX_VERSION_CODE < KERNEL_VERSION(4, 18, 0)
rq = blk_get_request(q, bio_data_dir(bio) == READ ? REQ_OP_SCSI_IN :
REQ_OP_SCSI_OUT, gfp_mask);
#else
rq = blk_get_request(q, bio_data_dir(bio) == READ ? REQ_OP_SCSI_IN :
REQ_OP_SCSI_OUT, gfp_mask_to_flags(gfp_mask));
#endif
if (IS_ERR(rq))
return rq;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 13, 0) || \
defined(CONFIG_SUSE_KERNEL)
scsi_req_init(scsi_req(rq));
#else
scsi_req_init(rq);
#endif
for_each_bio(bio) {
int ret;
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0) && \
!defined(CONFIG_SUSE_KERNEL)
struct bio *bounce_bio = bio;
blk_queue_bounce(q, &bounce_bio);
ret = blk_rq_append_bio(rq, bounce_bio);
if (unlikely(ret)) {
blk_put_request(rq);
return ERR_PTR(ret);
}
/*
* See also commit 0abc2a10389f ("block: fix
* blk_rq_append_bio"). That commit has been backported to
* kernel v4.14.11 as 88da02868f77.
*/
#elif LINUX_VERSION_CODE < KERNEL_VERSION(4, 14, 11) && \
!defined(CONFIG_SUSE_KERNEL)
ret = blk_rq_append_bio(rq, bio);
if (unlikely(ret)) {
blk_put_request(rq);
return ERR_PTR(ret);
}
#else
ret = blk_rq_append_bio(rq, &bio);
if (unlikely(ret)) {
blk_put_request(rq);
return ERR_PTR(ret);
}
#endif
}
return rq;
}
#endif
/* __blk_map_kern_sg - map kernel data to a request for REQ_TYPE_BLOCK_PC */
static struct request *__blk_map_kern_sg(struct request_queue *q,
struct scatterlist *sgl, int nents, struct blk_kern_sg_work *bw,
gfp_t gfp_mask, bool reading)
{
struct request *rq;
int max_nr_vecs, i;
size_t tot_len;
bool need_new_bio;
struct scatterlist *sg;
struct bio *bio = NULL, *hbio = NULL, *tbio = NULL;
int bios;
if (unlikely(sgl == NULL || sgl->length == 0 || nents <= 0)) {
WARN_ON_ONCE(true);
rq = ERR_PTR(-EINVAL);
goto out;
}
/*
* Restrict bio size to a single page to minimize the probability that
* bio allocation fails.
*/
max_nr_vecs = min_t(int,
(PAGE_SIZE - sizeof(struct bio)) / sizeof(struct bio_vec),
BIO_MAX_PAGES);
TRACE_DBG("max_nr_vecs %d, nents %d, reading %d", max_nr_vecs,
nents, reading);
need_new_bio = true;
tot_len = 0;
bios = 0;
for_each_sg(sgl, sg, nents, i) {
struct page *page = sg_page(sg);
void *page_addr = page_address(page);
size_t len = sg->length, l;
size_t offset = sg->offset;
tot_len += len;
/*
* Each segment must be DMA-aligned and must not reside not on
* the stack. The last segment may have unaligned length as
* long as the total length satisfies the DMA padding
* alignment requirements.
*/
if (i == nents - 1)
l = 0;
else
l = len;
TRACE_DBG("i %d, len %zd, tot_len %zd, l %zd, offset %zd",
i, len, tot_len, l, offset);
if (((sg->offset | l) & queue_dma_alignment(q)) ||
(page_addr && object_is_on_stack(page_addr + sg->offset))) {
rq = ERR_PTR(-EINVAL);
goto out_free_bios;
}
while (len > 0) {
size_t bytes;
int rc;
if (need_new_bio) {
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 28)
bio = bio_alloc_bioset(gfp_mask, max_nr_vecs, NULL);
if (bio)
bio->bi_destructor =
bio_kmalloc_destructor;
#else
bio = bio_kmalloc(gfp_mask, max_nr_vecs);
#endif
if (bio == NULL) {
rq = ERR_PTR(-ENOMEM);
goto out_free_bios;
}
if (!reading)
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
bio->bi_rw |= 1 << BIO_RW;
#elif (!defined(CONFIG_SUSE_KERNEL) && \
LINUX_VERSION_CODE < KERNEL_VERSION(4, 8, 0)) || \
LINUX_VERSION_CODE < KERNEL_VERSION(4, 4, 0)
bio->bi_rw |= REQ_WRITE;
#else
bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
#endif
bios++;
bio->bi_private = bw;
bio->bi_end_io = blk_bio_map_kern_endio;
TRACE_DBG("new bio %p, bios %d", bio, bios);
if (hbio == NULL)
hbio = bio;
else
tbio->bi_next = bio;
tbio = bio;
}
bytes = min_t(size_t, len, PAGE_SIZE - offset);
TRACE_DBG("len %zd, bytes %zd, offset %zd", len, bytes, offset);
rc = bio_add_pc_page(q, bio, page, bytes, offset);
if (rc < bytes) {
if (unlikely(need_new_bio || rc < 0)) {
rq = ERR_PTR(rc < 0 ? rc : -EIO);
goto out_free_bios;
} else {
need_new_bio = true;
len -= rc;
offset += rc;
}
} else {
need_new_bio = false;
offset = 0;
len -= bytes;
page = nth_page(page, 1);
}
}
}
if (hbio == NULL) {
rq = ERR_PTR(-EINVAL);
goto out_free_bios;
}
/* Total length must satisfy DMA padding alignment */
if ((tot_len & q->dma_pad_mask) && bw != NULL) {
rq = ERR_PTR(-EINVAL);
goto out_free_bios;
}
rq = blk_make_request(q, hbio, gfp_mask);
if (IS_ERR(rq))
goto out_free_bios;
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 0)
/*
* See also patch "block: add blk_rq_set_block_pc()" (commit
* f27b087b81b7).
*/
rq->cmd_type = REQ_TYPE_BLOCK_PC;
#endif
if (bw)
atomic_set(&bw->bios_inflight, bios);
out:
return rq;
out_free_bios:
while (hbio != NULL) {
bio = hbio;
hbio = hbio->bi_next;
bio_put(bio);
}
goto out;
}
/*
* blk_map_kern_sg - map kernel data to a request for REQ_TYPE_BLOCK_PC
* @rq: request to fill
* @sgl: area to map
* @nents: number of elements in @sgl
* @gfp: memory allocation flags
*
* Description:
* Data will be mapped directly if possible. Otherwise a bounce
* buffer will be used.
*/
static struct request *blk_map_kern_sg(struct request_queue *q,
struct scatterlist *sgl, int nents, gfp_t gfp, bool reading)
{
struct request *rq;
if (!sgl) {
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 11, 0)
rq = blk_get_request(q, reading ? READ : WRITE, gfp);
#elif LINUX_VERSION_CODE < KERNEL_VERSION(4, 18, 0)
rq = blk_get_request(q, reading ? REQ_OP_SCSI_IN :
REQ_OP_SCSI_OUT, gfp);
#else
rq = blk_get_request(q, reading ? REQ_OP_SCSI_IN :
REQ_OP_SCSI_OUT, gfp_mask_to_flags(gfp));
#endif
if (unlikely(!rq))
return ERR_PTR(-ENOMEM);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 13, 0) || \
defined(CONFIG_SUSE_KERNEL)
scsi_req_init(scsi_req(rq));
#else
scsi_req_init(rq);
#endif
goto out;
}
rq = __blk_map_kern_sg(q, sgl, nents, NULL, gfp, reading);
if (IS_ERR(rq)) {
struct blk_kern_sg_work *bw;
bw = blk_copy_kern_sg(q, sgl, nents, gfp, reading);
if (IS_ERR(bw)) {
rq = ERR_PTR(PTR_ERR(bw));
goto out;
}
rq = __blk_map_kern_sg(q, bw->sg_table.sgl, bw->sg_table.nents,
bw, gfp, reading);
if (IS_ERR(rq)) {
blk_free_kern_sg_work(bw);
goto out;
}
}
out:
return rq;
}
#endif
/*
* Can switch to the next dst_sg element, so, to copy to strictly only
* one dst_sg element, it must be either last in the chain, or
* copy_len == dst_sg->length.
*/
static int sg_copy_elem(struct scatterlist **pdst_sg, size_t *pdst_len,
size_t *pdst_offs, struct scatterlist *src_sg,
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
size_t copy_len,
enum km_type d_km_type, enum km_type s_km_type)
#else
size_t copy_len)
#endif
{
int res = 0;
struct scatterlist *dst_sg;
size_t src_len, dst_len, src_offs, dst_offs;
struct page *src_page, *dst_page;
dst_sg = *pdst_sg;
dst_len = *pdst_len;
dst_offs = *pdst_offs;
dst_page = sg_page(dst_sg);
src_page = sg_page(src_sg);
src_len = src_sg->length;
src_offs = src_sg->offset;
do {
void *saddr, *daddr;
size_t n;
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
saddr = kmap_atomic(src_page +
(src_offs >> PAGE_SHIFT), s_km_type) +
(src_offs & ~PAGE_MASK);
daddr = kmap_atomic(dst_page +
(dst_offs >> PAGE_SHIFT), d_km_type) +
(dst_offs & ~PAGE_MASK);
#else
saddr = kmap_atomic(src_page + (src_offs >> PAGE_SHIFT)) +
(src_offs & ~PAGE_MASK);
daddr = kmap_atomic(dst_page + (dst_offs >> PAGE_SHIFT)) +
(dst_offs & ~PAGE_MASK);
#endif
if (((src_offs & ~PAGE_MASK) == 0) &&
((dst_offs & ~PAGE_MASK) == 0) &&
(src_len >= PAGE_SIZE) && (dst_len >= PAGE_SIZE) &&
(copy_len >= PAGE_SIZE)) {
copy_page(daddr, saddr);
n = PAGE_SIZE;
} else {
n = min_t(size_t, PAGE_SIZE - (dst_offs & ~PAGE_MASK),
PAGE_SIZE - (src_offs & ~PAGE_MASK));
n = min(n, src_len);
n = min(n, dst_len);
n = min_t(size_t, n, copy_len);
memcpy(daddr, saddr, n);
}
dst_offs += n;
src_offs += n;
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
kunmap_atomic(saddr, s_km_type);
kunmap_atomic(daddr, d_km_type);
#else
kunmap_atomic(saddr);
kunmap_atomic(daddr);
#endif
res += n;
copy_len -= n;
if (copy_len == 0)
goto out;
src_len -= n;
dst_len -= n;
if (dst_len == 0) {
dst_sg = sg_next_inline(dst_sg);
if (dst_sg == NULL)
goto out;
dst_page = sg_page(dst_sg);
dst_len = dst_sg->length;
dst_offs = dst_sg->offset;
}
} while (src_len > 0);
out:
*pdst_sg = dst_sg;
*pdst_len = dst_len;
*pdst_offs = dst_offs;
return res;
}
/*
* sg_copy - copy one SG vector to another
* @dst_sg: destination SG
* @src_sg: source SG
* @nents_to_copy: maximum number of entries to copy
* @copy_len: maximum amount of data to copy. If 0, then copy all.
* @d_km_type: kmap_atomic type for the destination SG
* @s_km_type: kmap_atomic type for the source SG
*
* Description:
* Data from the source SG vector will be copied to the destination SG
* vector. End of the vectors will be determined by sg_next() returning
* NULL. Returns number of bytes copied.
*/
static int sg_copy(struct scatterlist *dst_sg, struct scatterlist *src_sg,
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
int nents_to_copy, size_t copy_len,
enum km_type d_km_type, enum km_type s_km_type)
#else
int nents_to_copy, size_t copy_len)
#endif
{
int res = 0;
size_t dst_len, dst_offs;
if (copy_len == 0)
copy_len = 0x7FFFFFFF; /* copy all */
if (nents_to_copy == 0)
nents_to_copy = 0x7FFFFFFF; /* copy all */
dst_len = dst_sg->length;
dst_offs = dst_sg->offset;
do {
int copied = sg_copy_elem(&dst_sg, &dst_len, &dst_offs,
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
src_sg, copy_len, d_km_type, s_km_type);
#else
src_sg, copy_len);
#endif
copy_len -= copied;
res += copied;
if ((copy_len == 0) || (dst_sg == NULL))
goto out;
nents_to_copy--;
if (nents_to_copy == 0)
goto out;
src_sg = sg_next_inline(src_sg);
} while (src_sg != NULL);
out:
return res;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30)
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0) && \
!defined(CONFIG_SUSE_KERNEL)
static void scsi_end_async(struct request *req, int error)
#else
static void scsi_end_async(struct request *req, blk_status_t error)
#endif
{
struct scsi_io_context *sioc = req->end_io_data;
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 12, 0)
TRACE_DBG("sioc %p, cmd %p, error %d / %d", sioc, sioc->data, error,
req->errors);
#else
TRACE_DBG("sioc %p, cmd %p, error %d", sioc, sioc->data, error);
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 17, 0)
lockdep_assert_held(req->q->queue_lock);
#elif LINUX_VERSION_CODE < KERNEL_VERSION(4, 21, 0) && \
(!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 8)
if (!req->q->mq_ops)
lockdep_assert_held(req->q->queue_lock);
#endif
if (sioc->done) {
int resid_len;
long result;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 12, 0)
result = scsi_req(req)->result;
#else
result = req->errors;
#endif
TRACE_DBG("error %d / %ld", error, result);
result = result && !IS_ERR_VALUE(result) ? result :
IS_ERR_VALUE(result) || error ?
SAM_STAT_CHECK_CONDITION : 0;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
resid_len = scsi_req(req)->resid_len;
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 31)
resid_len = req->resid_len;
#else
/*
* A quote from commit c3a4d78c580d: "rq->data_len served two
* purposes - the length of data buffer on issue and the
* residual count on completion."
*/
resid_len = req->data_len;
#endif
sioc->done(sioc->data, sioc->sense, result, resid_len);
}
kmem_cache_free(scsi_io_context_cache, sioc);
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 21, 0) && \
(!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 8)
/* See also commit 92bc5a24844a ("block: remove __blk_put_request()") */
__blk_put_request(req->q, req);
#else
blk_put_request(req);
#endif
return;
}
/**
* scst_scsi_exec_async - executes a SCSI command in pass-through mode
* @cmd: scst command
* @data: pointer passed to done() as "data"
* @done: callback function when done
*/
int scst_scsi_exec_async(struct scst_cmd *cmd, void *data,
void (*done)(void *data, char *sense, int result, int resid))
{
int res = 0;
struct request_queue *q = cmd->dev->scsi_dev->request_queue;
struct request *rq;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
struct scsi_request *req;
#else
struct request *req;
#endif
struct scsi_io_context *sioc;
bool reading = !(cmd->data_direction & SCST_DATA_WRITE);
gfp_t gfp = cmd->cmd_gfp_mask;
int cmd_len = cmd->cdb_len;
sioc = kmem_cache_zalloc(scsi_io_context_cache, gfp);
if (sioc == NULL) {
res = -ENOMEM;
goto out;
}
if (cmd->data_direction == SCST_DATA_BIDI) {
#ifdef QUEUE_FLAG_BIDI
struct request *next_rq;
if (!test_bit(QUEUE_FLAG_BIDI, &q->queue_flags)) {
res = -EOPNOTSUPP;
goto out_free_sioc;
}
rq = blk_map_kern_sg(q, cmd->out_sg, cmd->out_sg_cnt, gfp,
reading);
if (IS_ERR(rq)) {
res = PTR_ERR(rq);
TRACE_DBG("blk_map_kern_sg() failed: %d", res);
goto out_free_sioc;
}
next_rq = blk_map_kern_sg(q, cmd->sg, cmd->sg_cnt, gfp, false);
if (IS_ERR(next_rq)) {
res = PTR_ERR(next_rq);
TRACE_DBG("blk_map_kern_sg() failed: %d", res);
goto out_free_unmap;
}
rq->next_rq = next_rq;
#else
res = -EOPNOTSUPP;
goto out_free_sioc;
#endif
} else {
rq = blk_map_kern_sg(q, cmd->sg, cmd->sg_cnt, gfp, reading);
if (IS_ERR(rq)) {
res = PTR_ERR(rq);
TRACE_DBG("blk_map_kern_sg() failed: %d", res);
goto out_free_sioc;
}
}
TRACE_DBG("sioc %p, cmd %p", sioc, cmd);
sioc->data = data;
sioc->done = done;
req = scsi_req(rq);
req->cmd_len = cmd_len;
if (req->cmd_len <= BLK_MAX_CDB) {
memset(req->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */
memcpy(req->cmd, cmd->cdb, cmd->cdb_len);
} else
req->cmd = cmd->cdb;
req->sense = sioc->sense;
req->sense_len = sizeof(sioc->sense);
rq->timeout = cmd->timeout;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 12, 0)
req->retries = cmd->retries;
#else
rq->retries = cmd->retries;
#endif
rq->end_io_data = sioc;
#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 35)
rq->cmd_flags |= REQ_FAILFAST_MASK;
#endif
blk_execute_rq_nowait(rq->q, NULL, rq,
(cmd->queue_type == SCST_CMD_QUEUE_HEAD_OF_QUEUE), scsi_end_async);
out:
return res;
#ifdef QUEUE_FLAG_BIDI
out_free_unmap:
{
struct bio *bio = rq->bio, *b;
while (bio) {
b = bio;
bio = bio->bi_next;
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0)
b->bi_end_io(b, res);
#else
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0) && \
!defined(CONFIG_SUSE_KERNEL)
b->bi_error = res;
#else
b->bi_status = errno_to_blk_status(res);
#endif
b->bi_end_io(b);
#endif
}
}
rq->bio = NULL;
blk_put_request(rq);
#endif
out_free_sioc:
kmem_cache_free(scsi_io_context_cache, sioc);
goto out;
}
EXPORT_SYMBOL(scst_scsi_exec_async);
#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30) */
/*
* Can switch to the next dst_sg element, so, to cmp to strictly only
* one dst_sg element, it must be either last in the chain, or
* cmp_len == dst_sg->length.
*/
static int sg_cmp_elem(struct scatterlist **pdst_sg, size_t *pdst_len,
size_t *pdst_offs, struct scatterlist *src_sg,
size_t cmp_len, int *miscompare_offs,
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
enum km_type d_km_type, enum km_type s_km_type,
#endif
bool *cmp_res)
{
int res = 0;
struct scatterlist *dst_sg;
size_t src_len, dst_len, src_offs, dst_offs;
struct page *src_page, *dst_page;
void *saddr, *daddr;
*cmp_res = true;
dst_sg = *pdst_sg;
dst_len = *pdst_len;
dst_offs = *pdst_offs;
dst_page = sg_page(dst_sg);
src_page = sg_page(src_sg);
src_len = src_sg->length;
src_offs = src_sg->offset;
do {
size_t n;
int rc;
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
saddr = kmap_atomic(src_page + (src_offs >> PAGE_SHIFT), s_km_type) +
(src_offs & ~PAGE_MASK);
daddr = kmap_atomic(dst_page + (dst_offs >> PAGE_SHIFT), d_km_type) +
(dst_offs & ~PAGE_MASK);
#else
saddr = kmap_atomic(src_page + (src_offs >> PAGE_SHIFT)) +
(src_offs & ~PAGE_MASK);
daddr = kmap_atomic(dst_page + (dst_offs >> PAGE_SHIFT)) +
(dst_offs & ~PAGE_MASK);
#endif
if (((src_offs & ~PAGE_MASK) == 0) &&
((dst_offs & ~PAGE_MASK) == 0) &&
(src_len >= PAGE_SIZE) && (dst_len >= PAGE_SIZE) &&
(cmp_len >= PAGE_SIZE))
n = PAGE_SIZE;
else {
n = min_t(size_t, PAGE_SIZE - (dst_offs & ~PAGE_MASK),
PAGE_SIZE - (src_offs & ~PAGE_MASK));
n = min(n, src_len);
n = min(n, dst_len);
n = min_t(size_t, n, cmp_len);
}
/* Optimized for rare miscompares */
rc = memcmp(daddr, saddr, n);
if (rc != 0) {
*cmp_res = false;
if (miscompare_offs != NULL) {
int i, len = n;
unsigned long saddr_int = (unsigned long)saddr;
unsigned long daddr_int = (unsigned long)daddr;
int align_size = sizeof(unsigned long long);
int align_mask = align_size-1;
*miscompare_offs = -1;
if (((saddr_int & align_mask) == 0) &&
((daddr_int & align_mask) == 0) &&
((len & align_mask) == 0)) {
/* Fast path: both buffers and len aligned */
unsigned long long *s = saddr;
unsigned long long *d = daddr;
EXTRACHECKS_BUG_ON(len % align_size != 0);
len /= align_size;
for (i = 0; i < len; i++) {
if (s[i] != d[i]) {
uint8_t *s8 = (uint8_t *)&s[i];
uint8_t *d8 = (uint8_t *)&d[i];
int j;
for (j = 0; j < align_size; j++) {
if (s8[j] != d8[j]) {
*miscompare_offs = i * align_size + j;
break;
}
}
break;
}
}
} else {
uint8_t *s = saddr;
uint8_t *d = daddr;
for (i = 0; i < len; i++) {
if (s[i] != d[i]) {
*miscompare_offs = i;
break;
}
}
}
EXTRACHECKS_BUG_ON(*miscompare_offs == -1);
}
goto out_unmap;
}
dst_offs += n;
src_offs += n;
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
kunmap_atomic(saddr, s_km_type);
kunmap_atomic(daddr, d_km_type);
#else
kunmap_atomic(saddr);
kunmap_atomic(daddr);
#endif
res += n;
cmp_len -= n;
if (cmp_len == 0)
goto out;
src_len -= n;
dst_len -= n;
if (dst_len == 0) {
dst_sg = sg_next_inline(dst_sg);
if (dst_sg == NULL)
goto out;
dst_page = sg_page(dst_sg);
dst_len = dst_sg->length;
dst_offs = dst_sg->offset;
}
} while (src_len > 0);
out:
*pdst_sg = dst_sg;
*pdst_len = dst_len;
*pdst_offs = dst_offs;
return res;
out_unmap:
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
kunmap_atomic(saddr, s_km_type);
kunmap_atomic(daddr, d_km_type);
#else
kunmap_atomic(saddr);
kunmap_atomic(daddr);
#endif
goto out;
}
/**
* sg_cmp - compare 2 SG vectors
* @dst_sg: SG 1
* @src_sg: SG 2
* @nents_to_cmp: maximum number of entries to compare
* @cmp_len: maximum amount of data to compare. If 0, then compare all.
* @miscompare_offs: offset of the first miscompare. Can be NULL.
* @d_km_type: kmap_atomic type for SG 1
* @s_km_type: kmap_atomic type for SG 2
*
* Description:
* Data from the first SG vector will be compired with the second SG
* vector. End of the vectors will be determined by sg_next() returning
* NULL. Returns true if both vectors have identical data, false otherwise.
*
* Note! It ignores size of the vectors, so SGs with different size with
* the same data in min(sg1_size, sg2_size) size will match!
*/
static bool sg_cmp(struct scatterlist *dst_sg, struct scatterlist *src_sg,
int nents_to_cmp, size_t cmp_len, int *miscompare_offs
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
, enum km_type d_km_type, enum km_type s_km_type
#endif
)
{
bool res = true;
size_t dst_len, dst_offs;
int compared_all = 0;
TRACE_ENTRY();
TRACE_DBG("dst_sg %p, src_sg %p, nents_to_cmp %d, cmp_len %zd",
dst_sg, src_sg, nents_to_cmp, cmp_len);
if (cmp_len == 0)
cmp_len = 0x7FFFFFFF; /* cmp all */
if (nents_to_cmp == 0)
nents_to_cmp = 0x7FFFFFFF; /* cmp all */
dst_len = dst_sg->length;
dst_offs = dst_sg->offset;
do {
int compared;
TRACE_DBG("dst_sg %p, dst_len %zd, dst_offs %zd, src_sg %p, "
"nents_to_cmp %d, cmp_len %zd, compared_all %d",
dst_sg, dst_len, dst_offs, src_sg, nents_to_cmp,
cmp_len, compared_all);
compared = sg_cmp_elem(&dst_sg, &dst_len, &dst_offs,
src_sg, cmp_len, miscompare_offs,
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
d_km_type, s_km_type,
#endif
&res);
if (!res) {
if (miscompare_offs != NULL) {
*miscompare_offs += compared_all;
TRACE_DBG("miscompare_offs %d",
*miscompare_offs);
}
goto out;
}
cmp_len -= compared;
compared_all += compared;
if ((cmp_len == 0) || (dst_sg == NULL))
goto out;
nents_to_cmp--;
if (nents_to_cmp == 0)
goto out;
src_sg = sg_next_inline(src_sg);
} while (src_sg != NULL);
out:
TRACE_EXIT_RES(res);
return res;
}
/*
* scst_copy_sg() - copy data between the command's SGs
*
* Copies data between cmd->tgt_i_sg and cmd->sg as well as
* cmd->tgt_i_dif_sg and cmd->dif_sg in direction defined by
* copy_dir parameter.
*/
void scst_copy_sg(struct scst_cmd *cmd, enum scst_sg_copy_dir copy_dir)
{
struct scatterlist *src_sg, *dst_sg;
struct scatterlist *src_sg_dif, *dst_sg_dif;
unsigned int to_copy, to_copy_dif;
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
int atomic = scst_cmd_atomic(cmd);
#endif
TRACE_ENTRY();
if (copy_dir == SCST_SG_COPY_FROM_TARGET) {
if (cmd->data_direction != SCST_DATA_BIDI) {
src_sg = cmd->tgt_i_sg;
dst_sg = cmd->sg;
to_copy = cmd->bufflen;
src_sg_dif = cmd->tgt_i_dif_sg;
dst_sg_dif = cmd->dif_sg;
to_copy_dif = scst_cmd_get_bufflen_dif(cmd);
} else {
TRACE_MEM("BIDI cmd %p", cmd);
src_sg = cmd->tgt_out_sg;
dst_sg = cmd->out_sg;
to_copy = cmd->out_bufflen;
src_sg_dif = NULL;
dst_sg_dif = NULL;
to_copy_dif = 0;
}
} else {
src_sg = cmd->sg;
dst_sg = cmd->tgt_i_sg;
to_copy = cmd->adjusted_resp_data_len;
src_sg_dif = cmd->dif_sg;
dst_sg_dif = cmd->tgt_i_dif_sg;
to_copy_dif = scst_cmd_get_bufflen_dif(cmd);
}
TRACE_MEM("cmd %p, copy_dir %d, src_sg %p, dst_sg %p, to_copy %lld, "
"src_sg_dif %p, dst_sg_dif %p, to_copy_dif %lld",
cmd, copy_dir, src_sg, dst_sg, (long long)to_copy,
src_sg_dif, dst_sg_dif, (long long)to_copy_dif);
if (unlikely(src_sg == NULL) || unlikely(dst_sg == NULL) ||
unlikely(to_copy == 0)) {
/*
* It can happened, e.g., with scst_user for cmd with delay
* alloc, which failed with Check Condition.
*/
goto out;
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
sg_copy(dst_sg, src_sg, 0, to_copy,
atomic ? KM_SOFTIRQ0 : KM_USER0,
atomic ? KM_SOFTIRQ1 : KM_USER1);
#else
sg_copy(dst_sg, src_sg, 0, to_copy);
#endif
if ((src_sg_dif == NULL) || (dst_sg_dif == NULL) || (to_copy_dif == 0))
goto out;
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0)
sg_copy(dst_sg_dif, src_sg_dif, 0, to_copy_dif,
atomic ? KM_SOFTIRQ0 : KM_USER0,
atomic ? KM_SOFTIRQ1 : KM_USER1);
#else
sg_copy(dst_sg_dif, src_sg_dif, 0, to_copy_dif);
#endif
out:
TRACE_EXIT();
return;
}
EXPORT_SYMBOL_GPL(scst_copy_sg);
/**
* scst_get_buf_full - return linear buffer for command
* @cmd: scst command
* @buf: pointer on the resulting pointer
* @always_copy: copy the data buffer even for commands that read data
*
* If the command's buffer >single page, it vmalloc() the needed area
* and copies the buffer there. Returns length of the buffer or negative
* error code otherwise.
*/
int scst_get_buf_full(struct scst_cmd *cmd, uint8_t **buf, bool always_copy)
{
int res = 0;
TRACE_ENTRY();
EXTRACHECKS_BUG_ON(cmd->sg_buff_vmallocated);
if (scst_get_buf_count(cmd) > 1) {
int len;
uint8_t *tmp_buf;
int full_size;
full_size = 0;
len = scst_get_buf_first(cmd, &tmp_buf);
while (len > 0) {
full_size += len;
scst_put_buf(cmd, tmp_buf);
len = scst_get_buf_next(cmd, &tmp_buf);
}
#ifdef __COVERITY__
/* Help Coverity recognize that vmalloc(0) returns NULL. */
*buf = full_size ? vmalloc(full_size) : NULL;
#else
*buf = vmalloc(full_size);
#endif
if (*buf == NULL) {
TRACE(TRACE_OUT_OF_MEM, "vmalloc() failed for opcode "
"%s", scst_get_opcode_name(cmd));
res = -ENOMEM;
goto out;
}
cmd->sg_buff_vmallocated = 1;
if (scst_cmd_get_data_direction(cmd) == SCST_DATA_WRITE ||
always_copy) {
uint8_t *buf_ptr;
buf_ptr = *buf;
len = scst_get_buf_first(cmd, &tmp_buf);
while (len > 0) {
memcpy(buf_ptr, tmp_buf, len);
buf_ptr += len;
scst_put_buf(cmd, tmp_buf);
len = scst_get_buf_next(cmd, &tmp_buf);
}
}
res = full_size;
} else
res = scst_get_buf_first(cmd, buf);
out:
TRACE_EXIT_RES(res);
return res;
}
EXPORT_SYMBOL(scst_get_buf_full);
/**
* scst_get_buf_full_sense - return linear buffer for command
* @cmd: scst command
* @buf: pointer on the resulting pointer
*
* Does the same as scst_get_buf_full(), but in case of error
* additionally sets in cmd status code and sense.
*/
int scst_get_buf_full_sense(struct scst_cmd *cmd, uint8_t **buf)
{
int res = 0;
TRACE_ENTRY();
res = scst_get_buf_full(cmd, buf, false);
if (unlikely(res < 0)) {
PRINT_ERROR("scst_get_buf_full() failed: %d", res);
if (res == -ENOMEM)
scst_set_busy(cmd);
else
scst_set_cmd_error(cmd,
SCST_LOAD_SENSE(scst_sense_internal_failure));
goto out;
}
out:
TRACE_EXIT_RES(res);
return res;
}
EXPORT_SYMBOL(scst_get_buf_full_sense);
/**
* scst_put_buf_full - unmaps linear buffer for command
* @cmd: scst command
* @buf: pointer on the buffer to unmap
*
* Reverse operation for scst_get_buf_full()/scst_get_buf_full_sense().
* If the buffer was vmalloced(), it vfree() the buffer.
*/
void scst_put_buf_full(struct scst_cmd *cmd, uint8_t *buf)
{
TRACE_ENTRY();
if (buf == NULL)
goto out;
if (cmd->sg_buff_vmallocated) {
if (scst_cmd_get_data_direction(cmd) == SCST_DATA_READ) {
int len;
uint8_t *tmp_buf, *buf_p;
buf_p = buf;
len = scst_get_buf_first(cmd, &tmp_buf);
while (len > 0) {
memcpy(tmp_buf, buf_p, len);
buf_p += len;
scst_put_buf(cmd, tmp_buf);
len = scst_get_buf_next(cmd, &tmp_buf);
}
}
cmd->sg_buff_vmallocated = 0;
vfree(buf);
} else
scst_put_buf(cmd, buf);
out:
TRACE_EXIT();
return;
}
EXPORT_SYMBOL(scst_put_buf_full);
static __be16 scst_dif_crc_fn(const void *data, unsigned int len)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27)
return cpu_to_be16(crc_t10dif(data, len));
#else
WARN_ON_ONCE(true);
return 0;
#endif
}
static __be16 scst_dif_ip_fn(const void *data, unsigned int len)
{
return (__force __be16)ip_compute_csum(data, len);
}
static int scst_verify_dif_type1(struct scst_cmd *cmd)
{
int res = 0;
struct scst_device *dev = cmd->dev;
enum scst_dif_actions checks = scst_get_dif_checks(cmd->cmd_dif_actions);
int len, tags_len = 0, tag_size = 1 << SCST_DIF_TAG_SHIFT;
struct scatterlist *tags_sg = NULL;
uint8_t *buf, *tags_buf = NULL;
const struct t10_pi_tuple *t = NULL; /* to silence compiler warning */
uint64_t lba = cmd->lba;
int block_size = dev->block_size, block_shift = dev->block_shift;
__be16 (*crc_fn)(const void *buffer, unsigned int len);
TRACE_ENTRY();
EXTRACHECKS_BUG_ON(dev->dev_dif_type != 1);
#ifdef CONFIG_SCST_EXTRACHECKS
switch (scst_get_dif_action(scst_get_scst_dif_actions(cmd->cmd_dif_actions))) {
case SCST_DIF_ACTION_STRIP:
case SCST_DIF_ACTION_PASS_CHECK:
break;
default:
EXTRACHECKS_BUG_ON(1);
break;
}
EXTRACHECKS_BUG_ON(checks == SCST_DIF_ACTION_NONE);
#endif
crc_fn = cmd->tgt_dev->tgt_dev_dif_crc_fn;
len = scst_get_buf_first(cmd, &buf);
while (len > 0) {
int i;
uint8_t *cur_buf = buf;
for (i = 0; i < (len >> block_shift); i++) {
if (tags_buf == NULL) {
tags_buf = scst_get_dif_buf(cmd, &tags_sg, &tags_len);
EXTRACHECKS_BUG_ON(tags_len <= 0);
TRACE_DBG("tags_buf %p", tags_buf);
TRACE_BUFF_FLAG(TRACE_DEBUG, "Tags to verify",
tags_buf, tags_len);
t = (struct t10_pi_tuple *)tags_buf;
}
if (t->app_tag == SCST_DIF_NO_CHECK_ALL_APP_TAG) {
TRACE_DBG("Skipping tag %lld (cmd %p)",
(long long)lba, cmd);
goto next;
}
if (checks & SCST_DIF_CHECK_APP_TAG) {
if (t->app_tag != dev->dev_dif_static_app_tag) {
PRINT_WARNING("APP TAG check failed, "
"expected 0x%x, seeing "
"0x%x (cmd %p (op %s), lba %lld, "
"dev %s)", dev->dev_dif_static_app_tag,
t->app_tag, cmd, scst_get_opcode_name(cmd),
(long long)lba, dev->virt_name);
scst_dif_acc_app_check_failed_scst(cmd);
scst_set_cmd_error(cmd,
SCST_LOAD_SENSE(scst_logical_block_app_tag_check_failed));
res = -EIO;
goto out_put;
}
}
if (checks & SCST_DIF_CHECK_REF_TAG) {
if (t->ref_tag != cpu_to_be32(lba & 0xFFFFFFFF)) {
PRINT_WARNING("REF TAG check failed, "
"expected 0x%x, seeing "
"0x%x (cmd %p (op %s), lba %lld, "
"dev %s)", cpu_to_be32(lba & 0xFFFFFFFF),
t->ref_tag, cmd, scst_get_opcode_name(cmd),
(long long)lba, dev->virt_name);
scst_dif_acc_ref_check_failed_scst(cmd);
scst_set_cmd_error(cmd,
SCST_LOAD_SENSE(scst_logical_block_ref_tag_check_failed));
res = -EIO;
goto out_put;
}
}
/* Skip CRC check for internal commands */
if ((checks & SCST_DIF_CHECK_GUARD_TAG) &&
!cmd->internal) {
__be16 crc = crc_fn(cur_buf, block_size);
if (t->guard_tag != crc) {
PRINT_WARNING("GUARD TAG check failed, "
"expected 0x%x, seeing 0x%x "
"(cmd %p (op %s), lba %lld, "
"dev %s)", crc, t->guard_tag, cmd,
scst_get_opcode_name(cmd), (long long)lba,
dev->virt_name);
scst_dif_acc_guard_check_failed_scst(cmd);
scst_set_cmd_error(cmd,
SCST_LOAD_SENSE(scst_logical_block_guard_check_failed));
res = -EIO;
goto out_put;
}
}
next:
cur_buf += dev->block_size;
lba++;
t++;
tags_len -= tag_size;
if (tags_len == 0) {
scst_put_dif_buf(cmd, tags_buf);
tags_buf = NULL;
}
}
scst_put_buf(cmd, buf);
len = scst_get_buf_next(cmd, &buf);
}
EXTRACHECKS_BUG_ON(tags_buf != NULL);
out:
TRACE_EXIT_RES(res);
return res;
out_put:
scst_put_buf(cmd, buf);
scst_put_dif_buf(cmd, tags_buf);
goto out;
}
#ifdef CONFIG_SCST_DIF_INJECT_CORRUPTED_TAGS
static void scst_check_fail_ref_tag(struct scst_cmd *cmd)
{
enum scst_dif_actions checks = scst_get_dif_checks(cmd->cmd_dif_actions);
if (((cmd->dev->dev_dif_mode & SCST_DIF_MODE_TGT) == 0) &&
(checks & SCST_DIF_CHECK_REF_TAG)) {
TRACE(TRACE_SCSI|TRACE_MINOR, "No tgt dif_mode, failing "
"cmd %p with ref tag check failed", cmd);
scst_dif_acc_ref_check_failed_scst(cmd);
scst_set_cmd_error(cmd,
SCST_LOAD_SENSE(scst_logical_block_ref_tag_check_failed));
}
return;
}
static void scst_check_fail_guard_tag(struct scst_cmd *cmd)
{
enum scst_dif_actions checks = scst_get_dif_checks(cmd->cmd_dif_actions);
if (((cmd->dev->dev_dif_mode & SCST_DIF_MODE_TGT) == 0) &&
(checks & SCST_DIF_CHECK_GUARD_TAG)) {
TRACE(TRACE_SCSI|TRACE_MINOR, "No tgt dif_mode, failing "
"cmd %p with guard tag check failed", cmd);
scst_dif_acc_guard_check_failed_scst(cmd);
scst_set_cmd_error(cmd,
SCST_LOAD_SENSE(scst_logical_block_guard_check_failed));
}
return;
}
#endif
static int scst_generate_dif_type1(struct scst_cmd *cmd)
{
int res = 0;
struct scst_device *dev = cmd->dev;
int len, tags_len = 0, tag_size = 1 << SCST_DIF_TAG_SHIFT;
struct scatterlist *tags_sg = NULL;
uint8_t *buf, *tags_buf = NULL;
struct t10_pi_tuple *t = NULL; /* to silence compiler warning */
uint64_t lba = cmd->lba;
int block_size = dev->block_size, block_shift = dev->block_shift;
__be16 (*crc_fn)(const void *buffer, unsigned int len);
TRACE_ENTRY();
EXTRACHECKS_BUG_ON(dev->dev_dif_type != 1);
#ifdef CONFIG_SCST_EXTRACHECKS
switch (scst_get_dif_action(scst_get_scst_dif_actions(cmd->cmd_dif_actions))) {
case SCST_DIF_ACTION_INSERT:
break;
default:
EXTRACHECKS_BUG_ON(1);
break;
}
#endif
crc_fn = cmd->tgt_dev->tgt_dev_dif_crc_fn;
len = scst_get_buf_first(cmd, &buf);
while (len > 0) {
int i;
uint8_t *cur_buf = buf;
TRACE_DBG("len %d", len);
for (i = 0; i < (len >> block_shift); i++) {
TRACE_DBG("lba %lld, tags_len %d", (long long)lba, tags_len);
if (tags_buf == NULL) {
tags_buf = scst_get_dif_buf(cmd, &tags_sg, &tags_len);
TRACE_DBG("tags_sg %p, tags_buf %p, tags_len %d",
tags_sg, tags_buf, tags_len);
EXTRACHECKS_BUG_ON(tags_len <= 0);
t = (struct t10_pi_tuple *)tags_buf;
}
t->app_tag = dev->dev_dif_static_app_tag;
t->ref_tag = cpu_to_be32(lba & 0xFFFFFFFF);
t->guard_tag = crc_fn(cur_buf, block_size);
#ifdef CONFIG_SCST_DIF_INJECT_CORRUPTED_TAGS
switch (cmd->cmd_corrupt_dif_tag) {
case 0:
break;
case 1:
if (lba == cmd->lba) {
if (cmd->cdb[1] & 0x80) {
TRACE(TRACE_SCSI|TRACE_MINOR,
"Corrupting ref tag at lba "
"%lld (case %d, cmd %p)",
(long long)lba,
cmd->cmd_corrupt_dif_tag, cmd);
t->ref_tag = cpu_to_be32(0xebfeedad);
scst_check_fail_ref_tag(cmd);
} else {
TRACE(TRACE_SCSI|TRACE_MINOR,
"Corrupting guard tag at lba "
"%lld (case %d, cmd %p)",
(long long)lba,
cmd->cmd_corrupt_dif_tag, cmd);
t->guard_tag = cpu_to_be16(0xebed);
scst_check_fail_guard_tag(cmd);
}
}
break;
case 2:
if (lba == (cmd->lba + 1)) {
if (cmd->cdb[1] & 0x80) {
TRACE(TRACE_SCSI|TRACE_MINOR,
"Corrupting ref tag at lba "
"%lld (case %d, cmd %p)",
(long long)lba,
cmd->cmd_corrupt_dif_tag, cmd);
t->ref_tag = cpu_to_be32(0xebfeedad);
scst_check_fail_ref_tag(cmd);
} else {
TRACE(TRACE_SCSI|TRACE_MINOR,
"Corrupting guard tag at lba "
"%lld (case %d, cmd %p)",
(long long)lba,
cmd->cmd_corrupt_dif_tag, cmd);
t->guard_tag = cpu_to_be16(0xebed);
scst_check_fail_guard_tag(cmd);
}
}
break;
case 3:
if (lba == (cmd->lba + 2)) {
if (cmd->cdb[1] & 0x80) {
TRACE(TRACE_SCSI|TRACE_MINOR,
"Corrupting ref tag at lba "
"%lld (case %d, cmd %p)",
(long long)lba,
cmd->cmd_corrupt_dif_tag, cmd);
t->ref_tag = cpu_to_be32(0xebfeedad);
scst_check_fail_ref_tag(cmd);
} else {
TRACE(TRACE_SCSI|TRACE_MINOR,
"Corrupting guard tag at lba "
"%lld (case %d, cmd %p)",
(long long)lba,
cmd->cmd_corrupt_dif_tag, cmd);
t->guard_tag = cpu_to_be16(0xebed);
scst_check_fail_guard_tag(cmd);
}
}
break;
case 4:
if (lba == (cmd->lba + ((cmd->data_len >> dev->block_shift) >> 1))) {
if (cmd->cdb[1] & 0x80) {
TRACE(TRACE_SCSI|TRACE_MINOR,
"Corrupting ref tag at lba "
"%lld (case %d, cmd %p)",
(long long)lba,
cmd->cmd_corrupt_dif_tag, cmd);
t->ref_tag = cpu_to_be32(0xebfeedad);
scst_check_fail_ref_tag(cmd);
} else {
TRACE(TRACE_SCSI|TRACE_MINOR,
"Corrupting guard tag at lba "
"%lld (case %d, cmd %p)",
(long long)lba,
cmd->cmd_corrupt_dif_tag, cmd);
t->guard_tag = cpu_to_be16(0xebed);
scst_check_fail_guard_tag(cmd);
}
}
break;
case 5:
if (lba == (cmd->lba + ((cmd->data_len >> dev->block_shift) - 3))) {
if (cmd->cdb[1] & 0x80) {
TRACE(TRACE_SCSI|TRACE_MINOR,
"Corrupting ref tag at lba "
"%lld (case %d, cmd %p)",
(long long)lba,
cmd->cmd_corrupt_dif_tag, cmd);
t->ref_tag = cpu_to_be32(0xebfeedad);
scst_check_fail_ref_tag(cmd);
} else {
TRACE(TRACE_SCSI|TRACE_MINOR,
"Corrupting guard tag at lba "
"%lld (case %d, cmd %p)",
(long long)lba,
cmd->cmd_corrupt_dif_tag, cmd);
t->guard_tag = cpu_to_be16(0xebed);
scst_check_fail_guard_tag(cmd);
}
}
break;
case 6:
if (lba == (cmd->lba + ((cmd->data_len >> dev->block_shift) - 2))) {
if (cmd->cdb[1] & 0x80) {
TRACE(TRACE_SCSI|TRACE_MINOR,
"Corrupting ref tag at lba "
"%lld (case %d, cmd %p)",
(long long)lba,
cmd->cmd_corrupt_dif_tag, cmd);
t->ref_tag = cpu_to_be32(0xebfeedad);
scst_check_fail_ref_tag(cmd);
} else {
TRACE(TRACE_SCSI|TRACE_MINOR,
"Corrupting guard tag at lba "
"%lld (case %d, cmd %p)",
(long long)lba,
cmd->cmd_corrupt_dif_tag, cmd);
t->guard_tag = cpu_to_be16(0xebed);
scst_check_fail_guard_tag(cmd);
}
}
break;
case 7:
if (lba == (cmd->lba + ((cmd->data_len >> dev->block_shift) - 1))) {
if (cmd->cdb[1] & 0x80) {
TRACE(TRACE_SCSI|TRACE_MINOR,
"Corrupting ref tag at lba "
"%lld (case %d, cmd %p)",
(long long)lba,
cmd->cmd_corrupt_dif_tag, cmd);
t->ref_tag = cpu_to_be32(0xebfeedad);
scst_check_fail_ref_tag(cmd);
} else {
TRACE(TRACE_SCSI|TRACE_MINOR,
"Corrupting guard tag at lba "
"%lld (case %d, cmd %p)",
(long long)lba,
cmd->cmd_corrupt_dif_tag, cmd);
t->guard_tag = cpu_to_be16(0xebed);
scst_check_fail_guard_tag(cmd);
}
}
break;
}
#endif
cur_buf += dev->block_size;
lba++;
t++;
tags_len -= tag_size;
if (tags_len == 0) {
scst_put_dif_buf(cmd, tags_buf);
tags_buf = NULL;
}
}
scst_put_buf(cmd, buf);
len = scst_get_buf_next(cmd, &buf);
}
EXTRACHECKS_BUG_ON(tags_buf != NULL);
TRACE_EXIT_RES(res);
return res;
}
static int scst_do_dif(struct scst_cmd *cmd,
int (*generate_fn)(struct scst_cmd *cmd),
int (*verify_fn)(struct scst_cmd *cmd))
{
int res;
enum scst_dif_actions action = scst_get_dif_action(
scst_get_scst_dif_actions(cmd->cmd_dif_actions));
TRACE_ENTRY();
TRACE_DBG("cmd %p, action %d", cmd, action);
switch (action) {
case SCST_DIF_ACTION_PASS:
/* Nothing to do */
TRACE_DBG("PASS DIF action, skipping (cmd %p)", cmd);
res = 0;
break;
case SCST_DIF_ACTION_STRIP:
case SCST_DIF_ACTION_PASS_CHECK:
{
enum scst_dif_actions checks = scst_get_dif_checks(cmd->cmd_dif_actions);
if (likely(checks != SCST_DIF_ACTION_NONE))
res = verify_fn(cmd);
else
res = 0;
break;
}
case SCST_DIF_ACTION_INSERT:
res = generate_fn(cmd);
break;
case SCST_DIF_CHECK_APP_TAG:
case SCST_DIF_CHECK_GUARD_TAG:
case SCST_DIF_CHECK_REF_TAG:
default:
EXTRACHECKS_BUG_ON(1);
fallthrough;
case SCST_DIF_ACTION_NONE:
/* Nothing to do */
TRACE_DBG("NONE DIF action, skipping (cmd %p)", cmd);
res = 0;
break;
}
TRACE_EXIT_RES(res);
return res;
}
static int scst_dif_type1(struct scst_cmd *cmd)
{
int res;
TRACE_ENTRY();
EXTRACHECKS_BUG_ON(cmd->dev->dev_dif_type != 1);
res = scst_do_dif(cmd, scst_generate_dif_type1, scst_verify_dif_type1);
TRACE_EXIT_RES(res);
return res;
}
static int scst_verify_dif_type2(struct scst_cmd *cmd)
{
int res = 0;
struct scst_device *dev = cmd->dev;
enum scst_dif_actions checks = scst_get_dif_checks(cmd->cmd_dif_actions);
int len, tags_len = 0, tag_size = 1 << SCST_DIF_TAG_SHIFT;
struct scatterlist *tags_sg = NULL;
uint8_t *buf, *tags_buf = NULL;
const struct t10_pi_tuple *t = NULL; /* to silence compiler warning */
uint64_t lba = cmd->lba;
int block_size = dev->block_size, block_shift = dev->block_shift;
__be16 (*crc_fn)(const void *buffer, unsigned int len);
uint32_t ref_tag = scst_cmd_get_dif_exp_ref_tag(cmd);
/* Let's keep both in BE */
__be16 app_tag_mask = cpu_to_be16(scst_cmd_get_dif_app_tag_mask(cmd));
__be16 app_tag_masked = cpu_to_be16(scst_cmd_get_dif_exp_app_tag(cmd)) & app_tag_mask;
TRACE_ENTRY();
EXTRACHECKS_BUG_ON(dev->dev_dif_type != 2);
#ifdef CONFIG_SCST_EXTRACHECKS
switch (scst_get_dif_action(scst_get_scst_dif_actions(cmd->cmd_dif_actions))) {
case SCST_DIF_ACTION_STRIP:
case SCST_DIF_ACTION_PASS_CHECK:
break;
default:
EXTRACHECKS_BUG_ON(1);
break;
}
EXTRACHECKS_BUG_ON(checks == SCST_DIF_ACTION_NONE);
#endif
crc_fn = cmd->tgt_dev->tgt_dev_dif_crc_fn;
len = scst_get_buf_first(cmd, &buf);
while (len > 0) {
int i;
uint8_t *cur_buf = buf;
for (i = 0; i < (len >> block_shift); i++) {
if (tags_buf == NULL) {
tags_buf = scst_get_dif_buf(cmd, &tags_sg, &tags_len);
EXTRACHECKS_BUG_ON(tags_len <= 0);
t = (struct t10_pi_tuple *)tags_buf;
}
if (t->app_tag == SCST_DIF_NO_CHECK_ALL_APP_TAG) {
TRACE_DBG("Skipping tag (cmd %p)", cmd);
goto next;
}
if (checks & SCST_DIF_CHECK_APP_TAG) {
if ((t->app_tag & app_tag_mask) != app_tag_masked) {
PRINT_WARNING("APP TAG check failed, "
"expected 0x%x, seeing "
"0x%x (cmd %p (op %s), dev %s)",
app_tag_masked, t->app_tag & app_tag_mask,
cmd, scst_get_opcode_name(cmd), dev->virt_name);
scst_dif_acc_app_check_failed_scst(cmd);
scst_set_cmd_error(cmd,
SCST_LOAD_SENSE(scst_logical_block_app_tag_check_failed));
res = -EIO;
goto out_put;
}
}
if (checks & SCST_DIF_CHECK_REF_TAG) {
if (t->ref_tag != cpu_to_be32(ref_tag)) {
PRINT_WARNING("REF TAG check failed, "
"expected 0x%x, seeing "
"0x%x (cmd %p (op %s), dev %s)",
cpu_to_be32(ref_tag),
t->ref_tag, cmd, scst_get_opcode_name(cmd),
dev->virt_name);
scst_dif_acc_ref_check_failed_scst(cmd);
scst_set_cmd_error(cmd,
SCST_LOAD_SENSE(scst_logical_block_ref_tag_check_failed));
res = -EIO;
goto out_put;
}
}
/* Skip CRC check for internal commands */
if ((checks & SCST_DIF_CHECK_GUARD_TAG) &&
!cmd->internal) {
__be16 crc = crc_fn(cur_buf, block_size);
if (t->guard_tag != crc) {
PRINT_WARNING("GUARD TAG check failed, "
"expected 0x%x, seeing 0x%x "
"(cmd %p (op %s), lba %lld, "
"dev %s)", crc, t->guard_tag, cmd,
scst_get_opcode_name(cmd), (long long)lba,
dev->virt_name);
scst_dif_acc_guard_check_failed_scst(cmd);
scst_set_cmd_error(cmd,
SCST_LOAD_SENSE(scst_logical_block_guard_check_failed));
res = -EIO;
goto out_put;
}
}
next:
cur_buf += dev->block_size;
lba++;
ref_tag++;
t++;
tags_len -= tag_size;
if (tags_len == 0) {
scst_put_dif_buf(cmd, tags_buf);
tags_buf = NULL;
}
}
scst_put_buf(cmd, buf);
len = scst_get_buf_next(cmd, &buf);
}
EXTRACHECKS_BUG_ON(tags_buf != NULL);
out:
TRACE_EXIT_RES(res);
return res;
out_put:
scst_put_buf(cmd, buf);
scst_put_dif_buf(cmd, tags_buf);
goto out;
}
static int scst_generate_dif_type2(struct scst_cmd *cmd)
{
int res = 0;
struct scst_device *dev = cmd->dev;
int len, tags_len = 0, tag_size = 1 << SCST_DIF_TAG_SHIFT;
struct scatterlist *tags_sg = NULL;
uint8_t *buf, *tags_buf = NULL;
struct t10_pi_tuple *t = NULL; /* to silence compiler warning */
int block_size = dev->block_size, block_shift = dev->block_shift;
__be16 (*crc_fn)(const void *buffer, unsigned int len);
uint32_t ref_tag = scst_cmd_get_dif_exp_ref_tag(cmd);
/* Let's keep both in BE */
__be16 app_tag_mask = cpu_to_be16(scst_cmd_get_dif_app_tag_mask(cmd));
__be16 app_tag_masked = cpu_to_be16(scst_cmd_get_dif_exp_app_tag(cmd)) & app_tag_mask;
TRACE_ENTRY();
EXTRACHECKS_BUG_ON(dev->dev_dif_type != 2);
#ifdef CONFIG_SCST_EXTRACHECKS
switch (scst_get_dif_action(scst_get_scst_dif_actions(cmd->cmd_dif_actions))) {
case SCST_DIF_ACTION_INSERT:
break;
default:
EXTRACHECKS_BUG_ON(1);
break;
}
#endif
crc_fn = cmd->tgt_dev->tgt_dev_dif_crc_fn;
len = scst_get_buf_first(cmd, &buf);
while (len > 0) {
int i;
uint8_t *cur_buf = buf;
TRACE_DBG("len %d", len);
for (i = 0; i < (len >> block_shift); i++) {
TRACE_DBG("tags_len %d", tags_len);
if (tags_buf == NULL) {
tags_buf = scst_get_dif_buf(cmd, &tags_sg, &tags_len);
TRACE_DBG("tags_sg %p, tags_buf %p, tags_len %d",
tags_sg, tags_buf, tags_len);
EXTRACHECKS_BUG_ON(tags_len <= 0);
t = (struct t10_pi_tuple *)tags_buf;
}
t->app_tag = app_tag_masked;
t->ref_tag = cpu_to_be32(ref_tag);
t->guard_tag = crc_fn(cur_buf, block_size);
cur_buf += dev->block_size;
ref_tag++;
t++;
tags_len -= tag_size;
if (tags_len == 0) {
scst_put_dif_buf(cmd, tags_buf);
tags_buf = NULL;
}
}
scst_put_buf(cmd, buf);
len = scst_get_buf_next(cmd, &buf);
}
EXTRACHECKS_BUG_ON(tags_buf != NULL);
TRACE_EXIT_RES(res);
return res;
}
static int scst_dif_type2(struct scst_cmd *cmd)
{
int res;
TRACE_ENTRY();
EXTRACHECKS_BUG_ON(cmd->dev->dev_dif_type != 2);
res = scst_do_dif(cmd, scst_generate_dif_type2, scst_verify_dif_type2);
TRACE_EXIT_RES(res);
return res;
}
static int scst_verify_dif_type3(struct scst_cmd *cmd)
{
int res = 0;
struct scst_device *dev = cmd->dev;
enum scst_dif_actions checks = scst_get_dif_checks(cmd->cmd_dif_actions);
int len, tags_len = 0, tag_size = 1 << SCST_DIF_TAG_SHIFT;
struct scatterlist *tags_sg = NULL;
uint8_t *buf, *tags_buf = NULL;
const struct t10_pi_tuple *t = NULL; /* to silence compiler warning */
uint64_t lba = cmd->lba;
int block_size = dev->block_size, block_shift = dev->block_shift;
__be16 (*crc_fn)(const void *buffer, unsigned int len);
TRACE_ENTRY();
EXTRACHECKS_BUG_ON(dev->dev_dif_type != 3);
#ifdef CONFIG_SCST_EXTRACHECKS
switch (scst_get_dif_action(scst_get_scst_dif_actions(cmd->cmd_dif_actions))) {
case SCST_DIF_ACTION_STRIP:
case SCST_DIF_ACTION_PASS_CHECK:
break;
default:
EXTRACHECKS_BUG_ON(1);
break;
}
EXTRACHECKS_BUG_ON(checks == SCST_DIF_ACTION_NONE);
#endif
crc_fn = cmd->tgt_dev->tgt_dev_dif_crc_fn;
len = scst_get_buf_first(cmd, &buf);
while (len > 0) {
int i;
uint8_t *cur_buf = buf;
for (i = 0; i < (len >> block_shift); i++) {
if (tags_buf == NULL) {
tags_buf = scst_get_dif_buf(cmd, &tags_sg, &tags_len);
EXTRACHECKS_BUG_ON(tags_len <= 0);
t = (struct t10_pi_tuple *)tags_buf;
}
if ((t->app_tag == SCST_DIF_NO_CHECK_ALL_APP_TAG) &&
(t->ref_tag == SCST_DIF_NO_CHECK_ALL_REF_TAG)) {
TRACE_DBG("Skipping tag (cmd %p)", cmd);
goto next;
}
if (checks & SCST_DIF_CHECK_APP_TAG) {
if (t->app_tag != dev->dev_dif_static_app_tag) {
PRINT_WARNING("APP TAG check failed, "
"expected 0x%x, seeing "
"0x%x (cmd %p (op %s), dev %s)",
dev->dev_dif_static_app_tag,
t->app_tag, cmd, scst_get_opcode_name(cmd),
dev->virt_name);
scst_dif_acc_app_check_failed_scst(cmd);
scst_set_cmd_error(cmd,
SCST_LOAD_SENSE(scst_logical_block_app_tag_check_failed));
res = -EIO;
goto out_put;
}
}
if (checks & SCST_DIF_CHECK_REF_TAG) {
if (t->ref_tag != dev->dev_dif_static_app_ref_tag) {
PRINT_WARNING("REF TAG check failed, "
"expected 0x%x, seeing "
"0x%x (cmd %p (op %s), dev %s)",
dev->dev_dif_static_app_ref_tag,
t->ref_tag, cmd, scst_get_opcode_name(cmd),
dev->virt_name);
scst_dif_acc_ref_check_failed_scst(cmd);
scst_set_cmd_error(cmd,
SCST_LOAD_SENSE(scst_logical_block_ref_tag_check_failed));
res = -EIO;
goto out_put;
}
}
/* Skip CRC check for internal commands */
if ((checks & SCST_DIF_CHECK_GUARD_TAG) &&
!cmd->internal) {
__be16 crc = crc_fn(cur_buf, block_size);
if (t->guard_tag != crc) {
PRINT_WARNING("GUARD TAG check failed, "
"expected 0x%x, seeing 0x%x "
"(cmd %p (op %s), lba %lld, "
"dev %s)", crc, t->guard_tag, cmd,
scst_get_opcode_name(cmd), (long long)lba,
dev->virt_name);
scst_dif_acc_guard_check_failed_scst(cmd);
scst_set_cmd_error(cmd,
SCST_LOAD_SENSE(scst_logical_block_guard_check_failed));
res = -EIO;
goto out_put;
}
}
next:
cur_buf += dev->block_size;
lba++;
t++;
tags_len -= tag_size;
if (tags_len == 0) {
scst_put_dif_buf(cmd, tags_buf);
tags_buf = NULL;
}
}
scst_put_buf(cmd, buf);
len = scst_get_buf_next(cmd, &buf);
}
EXTRACHECKS_BUG_ON(tags_buf != NULL);
out:
TRACE_EXIT_RES(res);
return res;
out_put:
scst_put_buf(cmd, buf);
scst_put_dif_buf(cmd, tags_buf);
goto out;
}
static int scst_generate_dif_type3(struct scst_cmd *cmd)
{
int res = 0;
struct scst_device *dev = cmd->dev;
int len, tags_len = 0, tag_size = 1 << SCST_DIF_TAG_SHIFT;
struct scatterlist *tags_sg = NULL;
uint8_t *buf, *tags_buf = NULL;
struct t10_pi_tuple *t = NULL; /* to silence compiler warning */
int block_size = dev->block_size, block_shift = dev->block_shift;
__be16 (*crc_fn)(const void *buffer, unsigned int len);
TRACE_ENTRY();
EXTRACHECKS_BUG_ON(dev->dev_dif_type != 3);
#ifdef CONFIG_SCST_EXTRACHECKS
switch (scst_get_dif_action(scst_get_scst_dif_actions(cmd->cmd_dif_actions))) {
case SCST_DIF_ACTION_INSERT:
break;
default:
EXTRACHECKS_BUG_ON(1);
break;
}
#endif
crc_fn = cmd->tgt_dev->tgt_dev_dif_crc_fn;
len = scst_get_buf_first(cmd, &buf);
while (len > 0) {
int i;
uint8_t *cur_buf = buf;
TRACE_DBG("len %d", len);
for (i = 0; i < (len >> block_shift); i++) {
TRACE_DBG("tags_len %d", tags_len);
if (tags_buf == NULL) {
tags_buf = scst_get_dif_buf(cmd, &tags_sg, &tags_len);
TRACE_DBG("tags_sg %p, tags_buf %p, tags_len %d",
tags_sg, tags_buf, tags_len);
EXTRACHECKS_BUG_ON(tags_len <= 0);
t = (struct t10_pi_tuple *)tags_buf;
}
t->app_tag = dev->dev_dif_static_app_tag;
t->ref_tag = dev->dev_dif_static_app_ref_tag;
t->guard_tag = crc_fn(cur_buf, block_size);
cur_buf += dev->block_size;
t++;
tags_len -= tag_size;
if (tags_len == 0) {
scst_put_dif_buf(cmd, tags_buf);
tags_buf = NULL;
}
}
scst_put_buf(cmd, buf);
len = scst_get_buf_next(cmd, &buf);
}
EXTRACHECKS_BUG_ON(tags_buf != NULL);
TRACE_EXIT_RES(res);
return res;
}
static int scst_dif_type3(struct scst_cmd *cmd)
{
int res;
TRACE_ENTRY();
EXTRACHECKS_BUG_ON(cmd->dev->dev_dif_type != 3);
res = scst_do_dif(cmd, scst_generate_dif_type3, scst_verify_dif_type3);
TRACE_EXIT_RES(res);
return res;
}
static void scst_init_dif_checks(struct scst_device *dev)
{
switch (dev->dev_dif_type) {
case 0:
dev->dif_app_chk = 0;
dev->dif_ref_chk = 0;
break;
case 1:
if (scst_dev_get_dif_static_app_tag(dev) != SCST_DIF_NO_CHECK_APP_TAG)
dev->dif_app_chk = SCST_DIF_CHECK_APP_TAG;
else
dev->dif_app_chk = 0;
dev->dif_ref_chk = SCST_DIF_CHECK_REF_TAG;
break;
case 2:
dev->dif_app_chk = dev->ato ? SCST_DIF_CHECK_APP_TAG : 0;
dev->dif_ref_chk = SCST_DIF_CHECK_REF_TAG;
break;
case 3:
if (scst_dev_get_dif_static_app_tag_combined(dev) != SCST_DIF_NO_CHECK_APP_TAG) {
dev->dif_app_chk = SCST_DIF_CHECK_APP_TAG;
dev->dif_ref_chk = SCST_DIF_CHECK_REF_TAG;
} else {
dev->dif_app_chk = 0;
dev->dif_ref_chk = 0;
}
break;
default:
WARN_ON(1);
break;
}
return;
}
/*
* scst_dev_set_dif_static_app_tag_combined() - sets static app tag
*
* Description:
* Sets static app tag for both APP TAG and REF TAG (DIF mode 3)
*/
void scst_dev_set_dif_static_app_tag_combined(
struct scst_device *dev, __be64 app_tag)
{
uint64_t a = be64_to_cpu(app_tag);
dev->dev_dif_static_app_tag = cpu_to_be16(a & 0xFFFF);
if (dev->dev_dif_type == 3)
dev->dev_dif_static_app_ref_tag = cpu_to_be32((a >> 16) & 0xFFFFFFFF);
scst_init_dif_checks(dev);
return;
}
EXPORT_SYMBOL_GPL(scst_dev_set_dif_static_app_tag_combined);
static int scst_init_dif_actions(struct scst_device *dev)
{
int res = 0;
TRACE_ENTRY();
BUILD_BUG_ON(SCST_DIF_ACTION_NONE != 0);
if ((dev->dev_dif_type == 0) || (dev->dev_dif_mode == 0)) {
dev->dev_dif_rd_actions = SCST_DIF_ACTION_NONE;
dev->dev_dif_wr_actions = SCST_DIF_ACTION_NONE;
dev->dev_dif_rd_prot0_actions = SCST_DIF_ACTION_NONE;
dev->dev_dif_wr_prot0_actions = SCST_DIF_ACTION_NONE;
goto out;
}
if ((dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) &&
!(dev->dev_dif_mode & SCST_DIF_MODE_DEV_STORE)) {
PRINT_ERROR("DEV CHECK is not allowed without DEV STORE! "
"(dev %s)", dev->virt_name);
res = -EINVAL;
goto out;
}
/*
* COMMON RULES
* ============
*
* 1. For SCST STRIP and PASS_CHECK as well as PASS and NONE are
* the same.
*
* 2. For dev handlers STRIP and INSERT are invalid, PASS and NONE are
* the same. Also, PASS and PASS_CHECK are equal regarding STORE,
* if STORE is configured.
*/
BUILD_BUG_ON(SCST_DIF_MODE_DEV != (SCST_DIF_MODE_DEV_CHECK | SCST_DIF_MODE_DEV_STORE));
if (dev->dev_dif_mode & SCST_DIF_MODE_TGT) {
if (dev->dev_dif_mode & SCST_DIF_MODE_SCST) {
if (dev->dev_dif_mode & SCST_DIF_MODE_DEV) { /* TGT, SCST, DEV */
scst_set_tgt_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS_CHECK);
scst_set_scst_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS_CHECK);
if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) {
/* STORE might be set as well */
scst_set_dev_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS_CHECK);
} else
scst_set_dev_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS);
if (dev->dpicz) {
scst_set_tgt_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE);
scst_set_scst_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE);
scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE);
} else {
scst_set_tgt_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_STRIP);
scst_set_scst_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_PASS_CHECK);
if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) {
/* STORE might be set as well */
scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_PASS_CHECK);
} else
scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_PASS);
}
scst_set_tgt_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS_CHECK);
scst_set_scst_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS_CHECK);
if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) {
/* STORE might be set as well */
scst_set_dev_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS_CHECK);
} else
scst_set_dev_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS);
scst_set_tgt_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_INSERT);
scst_set_scst_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_PASS_CHECK);
if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) {
/* STORE might be set as well */
scst_set_dev_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_PASS_CHECK);
} else
scst_set_dev_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_PASS);
} else { /* TGT, SCST, no DEV */
scst_set_tgt_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS_CHECK);
scst_set_scst_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_INSERT);
scst_set_dev_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_NONE);
if (dev->dpicz) {
scst_set_tgt_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE);
scst_set_scst_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE);
} else {
scst_set_tgt_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_STRIP);
scst_set_scst_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_INSERT);
}
scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE);
scst_set_tgt_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS_CHECK);
scst_set_scst_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_STRIP);
scst_set_dev_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_NONE);
scst_set_tgt_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_INSERT);
scst_set_scst_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_STRIP);
scst_set_dev_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_NONE);
}
} else { /* TGT, no SCST */
if (dev->dev_dif_mode & SCST_DIF_MODE_DEV) { /* TGT, no SCST, DEV */
scst_set_tgt_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS_CHECK);
scst_set_scst_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS);
if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) {
/* STORE might be set as well */
scst_set_dev_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS_CHECK);
} else {
scst_set_dev_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS);
}
if (dev->dpicz) {
scst_set_tgt_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE);
scst_set_scst_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE);
scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE);
} else {
scst_set_tgt_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_STRIP);
scst_set_scst_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_PASS);
if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) {
/* STORE might be set as well */
scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_PASS_CHECK);
} else
scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_PASS);
}
scst_set_tgt_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS_CHECK);
scst_set_scst_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS);
if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) {
/* STORE might be set as well */
scst_set_dev_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS_CHECK);
} else
scst_set_dev_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS);
scst_set_tgt_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_INSERT);
scst_set_scst_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_PASS);
if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) {
/* STORE might be set as well */
scst_set_dev_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_PASS_CHECK);
} else
scst_set_dev_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_PASS);
} else { /* TGT, no SCST, no DEV */
scst_set_tgt_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_INSERT);
scst_set_scst_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_NONE);
scst_set_dev_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_NONE);
scst_set_tgt_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE);
scst_set_scst_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE);
scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE);
#if 1 /*
* Workaround for Emulex ASIC errata to pass Oracle certification.
*
* Emulex ASIC in the STRIP mode can't distinguish between different types of
* PI tags mismatches (reference, guard, application), hence the Oracle
* certification fails. Workaround is to get the tags data in the memory, so
* then, if HW is signaling that there is some tag mismatch, manually recheck
* in the driver, then set correct tag mismatch sense.
*/
scst_set_tgt_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS_CHECK);
scst_set_scst_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS);
#else
scst_set_tgt_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_STRIP);
scst_set_scst_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_NONE);
#endif
scst_set_dev_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_NONE);
scst_set_tgt_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_NONE);
scst_set_scst_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_NONE);
scst_set_dev_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_NONE);
}
}
} else { /* No TGT */
if (dev->dev_dif_mode & SCST_DIF_MODE_SCST) { /* No TGT, SCST */
if (dev->dev_dif_mode & SCST_DIF_MODE_DEV) { /* No TGT, SCST, DEV */
scst_set_tgt_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS);
scst_set_scst_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS_CHECK);
if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) {
/* STORE might be set as well */
scst_set_dev_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS_CHECK);
} else
scst_set_dev_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS);
scst_set_tgt_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE);
if (dev->dpicz) {
scst_set_scst_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE);
scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE);
} else {
scst_set_scst_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_STRIP);
if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) {
/* STORE might be set as well */
scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_PASS_CHECK);
} else
scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_PASS);
}
scst_set_tgt_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS);
scst_set_scst_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS_CHECK);
if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) {
/* STORE might be set as well */
scst_set_dev_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS_CHECK);
} else
scst_set_dev_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS);
scst_set_tgt_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_NONE);
scst_set_scst_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_INSERT);
if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) {
/* STORE might be set as well */
scst_set_dev_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_PASS_CHECK);
} else
scst_set_dev_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_PASS);
} else { /* No TGT, SCST, no DEV */
scst_set_tgt_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS);
scst_set_scst_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_INSERT);
scst_set_dev_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_NONE);
scst_set_tgt_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE);
scst_set_scst_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE);
scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE);
scst_set_tgt_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS);
scst_set_scst_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_STRIP);
scst_set_dev_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_NONE);
scst_set_tgt_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_NONE);
scst_set_scst_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_NONE);
scst_set_dev_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_NONE);
}
} else { /* No TGT, no SCST */
if (dev->dev_dif_mode & SCST_DIF_MODE_DEV) { /* No TGT, no SCST, DEV */
scst_set_tgt_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS);
scst_set_scst_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS);
if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) {
/* STORE might be set as well */
scst_set_dev_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS_CHECK);
} else
scst_set_dev_dif_action(&dev->dev_dif_rd_actions, SCST_DIF_ACTION_PASS);
scst_set_tgt_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE);
if (dev->dpicz) {
scst_set_scst_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE);
scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_NONE);
} else {
scst_set_scst_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_PASS);
if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) {
/* STORE might be set as well */
scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_PASS_CHECK);
} else
scst_set_dev_dif_action(&dev->dev_dif_rd_prot0_actions, SCST_DIF_ACTION_PASS);
}
scst_set_tgt_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS);
scst_set_scst_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS);
if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) {
/* STORE might be set as well */
scst_set_dev_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS_CHECK);
} else
scst_set_dev_dif_action(&dev->dev_dif_wr_actions, SCST_DIF_ACTION_PASS);
scst_set_tgt_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_NONE);
scst_set_scst_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_INSERT);
if (dev->dev_dif_mode & SCST_DIF_MODE_DEV_CHECK) {
/* STORE might be set as well */
scst_set_dev_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_PASS_CHECK);
} else
scst_set_dev_dif_action(&dev->dev_dif_wr_prot0_actions, SCST_DIF_ACTION_PASS);
} else { /* No TGT, no SCST, no DEV */
sBUG_ON(1);
}
}
}
TRACE_DBG("rd_actions %x, rd_prot0_actions %x, wr_actions %x, "
"wr_prot0_actions %x", dev->dev_dif_rd_actions,
dev->dev_dif_rd_prot0_actions, dev->dev_dif_wr_actions,
dev->dev_dif_wr_prot0_actions);
out:
TRACE_EXIT_RES(res);
return res;
}
/*
* scst_set_dif_params() - sets DIF parameters
*
* Description:
* Sets DIF parameters for device
*
* Returns: 0 on success, negative error code otherwise.
*/
int scst_set_dif_params(struct scst_device *dev, enum scst_dif_mode dif_mode,
int dif_type)
{
int res = -EINVAL;
TRACE_ENTRY();
BUILD_BUG_ON(SCST_DIF_ACTION_NONE != 0);
if (((dif_mode & ~(SCST_DIF_MODE_TGT|SCST_DIF_MODE_SCST|SCST_DIF_MODE_DEV)) != 0)) {
PRINT_ERROR("Invalid DIF mode %x", dif_mode);
goto out;
}
if ((dif_type < 0) || (dif_type > 3)) {
PRINT_ERROR("DIF type %d not supported", dif_type);
goto out;
}
if ((dif_mode == 0) && (dif_type != 0)) {
PRINT_ERROR("With DIF mode 0 DIF type must be 0 (dev %s)",
dev->virt_name);
goto out;
}
dev->dev_dif_mode = dif_mode;
dev->dev_dif_type = dif_type;
if (dif_type == 0) {
TRACE_DBG("DIF type 0, ignoring DIF mode");
goto out_none;
}
if (dif_mode == 0) {
TRACE_DBG("DIF mode 0");
goto out_none;
}
scst_init_dif_checks(dev);
if (dif_mode & SCST_DIF_MODE_SCST) {
switch (dif_type) {
case 1:
dev->dev_dif_fn = scst_dif_type1;
break;
case 2:
dev->dev_dif_fn = scst_dif_type2;
break;
case 3:
dev->dev_dif_fn = scst_dif_type3;
break;
default:
sBUG_ON(1);
break;
}
} else {
if ((dif_type == 1) && !(dif_mode & SCST_DIF_MODE_TGT))
dev->dev_dif_fn = scst_dif_type1;
else if ((dif_type == 1) && (dif_mode & SCST_DIF_MODE_TGT))
dev->dev_dif_fn = scst_dif_none_type1;
else
dev->dev_dif_fn = scst_dif_none;
}
res = scst_init_dif_actions(dev);
if (res != 0)
goto out;
res = scst_dev_sysfs_dif_create(dev);
if (res != 0)
goto out;
PRINT_INFO("device %s: DIF mode %x, DIF type %d", dev->virt_name,
dev->dev_dif_mode, dev->dev_dif_type);
TRACE_DBG("app_chk %x, ref_chk %x", dev->dif_app_chk, dev->dif_ref_chk);
out:
TRACE_EXIT_RES(res);
return res;
out_none:
dev->dif_app_chk = 0;
if (dev->dev_dif_type == 3)
dev->dif_ref_chk = 0;
dev->dev_dif_static_app_tag = SCST_DIF_NO_CHECK_APP_TAG;
dev->dev_dif_static_app_ref_tag = SCST_DIF_NO_CHECK_APP_TAG;
dev->dev_dif_fn = scst_dif_none;
res = scst_init_dif_actions(dev);
goto out;
}
EXPORT_SYMBOL_GPL(scst_set_dif_params);
static int scst_dif_none(struct scst_cmd *cmd)
{
int res = 0;
TRACE_ENTRY();
/* Nothing to do */
TRACE_EXIT_RES(res);
return res;
}
#ifdef CONFIG_SCST_DIF_INJECT_CORRUPTED_TAGS
static int scst_dif_none_type1(struct scst_cmd *cmd)
{
int res = 0;
TRACE_ENTRY();
if (unlikely(cmd->cmd_corrupt_dif_tag != 0)) {
EXTRACHECKS_BUG_ON(cmd->dev->dev_dif_type != 1);
res = scst_dif_type1(cmd);
}
TRACE_EXIT_RES(res);
return res;
}
#endif
/*
* Returns 0 on success or POSITIVE error code otherwise (to match
* scst_get_cdb_info() semantic)
*/
static int __scst_parse_rdprotect(struct scst_cmd *cmd, int rdprotect,
int rdprotect_offs)
{
int res = 0;
const struct scst_device *dev = cmd->dev;
TRACE_ENTRY();
TRACE_DBG("rdprotect %x", rdprotect);
EXTRACHECKS_BUG_ON(dev->dev_dif_type == 0);
switch (rdprotect) {
case 0:
cmd->cmd_dif_actions = dev->dev_dif_rd_prot0_actions |
SCST_DIF_CHECK_GUARD_TAG | dev->dif_app_chk |
dev->dif_ref_chk;
break;
case 1:
case 5:
cmd->cmd_dif_actions = dev->dev_dif_rd_actions |
SCST_DIF_CHECK_GUARD_TAG | dev->dif_app_chk |
dev->dif_ref_chk;
cmd->tgt_dif_data_expected = 1;
break;
case 2:
cmd->cmd_dif_actions = dev->dev_dif_rd_actions |
dev->dif_app_chk | dev->dif_ref_chk;
cmd->tgt_dif_data_expected = 1;
break;
case 3:
cmd->cmd_dif_actions = dev->dev_dif_rd_actions;
cmd->tgt_dif_data_expected = 1;
break;
case 4:
cmd->cmd_dif_actions = dev->dev_dif_rd_actions |
dev->dif_app_chk;
cmd->tgt_dif_data_expected = 1;
break;
default:
TRACE(TRACE_SCSI|TRACE_MINOR, "Invalid RDPROTECT value %x "
"(dev %s, cmd %p)", rdprotect, dev->virt_name, cmd);
scst_set_invalid_field_in_cdb(cmd, rdprotect_offs,
5|SCST_INVAL_FIELD_BIT_OFFS_VALID);
res = EINVAL;
goto out;
}
TRACE_DBG("cmd_dif_actions %x, tgt_dif_data_expected %d (cmd %p)",
cmd->cmd_dif_actions, cmd->tgt_dif_data_expected, cmd);
out:
TRACE_EXIT_RES(res);
return res;
}
/*
* Returns 0 on success or POSITIVE error code otherwise (to match
* scst_get_cdb_info() semantic)
*/
static int scst_parse_rdprotect(struct scst_cmd *cmd)
{
int res = 0;
int rdprotect = (cmd->cdb[1] & 0xE0) >> 5;
const struct scst_device *dev = cmd->dev;
TRACE_ENTRY();
if (dev->dev_dif_mode == SCST_DIF_MODE_NONE) {
if (likely(rdprotect == 0))
goto out;
TRACE(TRACE_SCSI|TRACE_MINOR, "RDPROTECT %x and no DIF "
"device %s (cmd %p)", rdprotect,
dev->virt_name, cmd);
scst_set_invalid_field_in_cdb(cmd, 1,
5|SCST_INVAL_FIELD_BIT_OFFS_VALID);
res = EINVAL;
goto out;
}
if (unlikely((dev->dev_dif_type == 2) && (rdprotect != 0))) {
TRACE(TRACE_SCSI|TRACE_MINOR, "Non-32-byte CDBs with non-zero "
"rdprotect (%d) are not allowed in DIF type 2 "
"(dev %s, cmd %p, op %s)", rdprotect, dev->virt_name,
cmd, scst_get_opcode_name(cmd));
scst_set_cmd_error(cmd,
SCST_LOAD_SENSE(scst_sense_invalid_opcode));
res = EINVAL;
goto out;
}
#ifdef CONFIG_SCST_DIF_INJECT_CORRUPTED_TAGS
if (unlikely(cmd->cmd_corrupt_dif_tag != 0)) {
if ((cmd->dev->dev_dif_type == 1) &&
((dev->dev_dif_mode & SCST_DIF_MODE_DEV_STORE) == 0)) {
TRACE_DBG("cmd_corrupt_dif_tag %x, rdprotect %x, cmd %p",
cmd->cmd_corrupt_dif_tag, rdprotect, cmd);
/* Reset the highest bit used to choose which tag to corrupt */
rdprotect &= 3;
} else {
/* Restore it */
cmd->cmd_corrupt_dif_tag = 0;
}
}
#endif
res = __scst_parse_rdprotect(cmd, rdprotect, 1);
#ifdef CONFIG_SCST_DIF_INJECT_CORRUPTED_TAGS
if (unlikely(cmd->cmd_corrupt_dif_tag != 0)) {
if (res == 0) {
TRACE_DBG("Corrupt DIF tag, (re)set cmd_dif_actions "
"(cmd %p)", cmd);
/*
* Then (re)set it just in case if dif_mode is tgt-only.
* It's OK, because we have ensured that dif_mode
* doesn't contain dev_store.
*/
scst_set_scst_dif_action(&cmd->cmd_dif_actions,
SCST_DIF_ACTION_INSERT);
if (scst_get_dif_action(scst_get_read_dif_tgt_actions(cmd)) == SCST_DIF_ACTION_INSERT)
scst_set_tgt_dif_action(&cmd->cmd_dif_actions,
SCST_DIF_ACTION_PASS_CHECK);
} else
TRACE_DBG("parse rdprotect failed: %d", res);
}
#endif
out:
TRACE_EXIT_RES(res);
return res;
}
/*
* Returns 0 on success or POSITIVE error code otherwise (to match
* scst_get_cdb_info() semantic)
*/
static int scst_parse_rdprotect32(struct scst_cmd *cmd)
{
int res = 0;
int rdprotect = (cmd->cdb[10] & 0xE0) >> 5;
const struct scst_device *dev = cmd->dev;
TRACE_ENTRY();
if (unlikely(dev->dev_dif_type != 2)) {
TRACE(TRACE_SCSI|TRACE_MINOR, "32-byte CDBs are not "
"allowed in DIF type %d (dev %s, cmd %p, op %s)",
dev->dev_dif_type, dev->virt_name, cmd,
scst_get_opcode_name(cmd));
scst_set_cmd_error(cmd,
SCST_LOAD_SENSE(scst_sense_invalid_opcode));
res = EINVAL;
goto out;
}
res = __scst_parse_rdprotect(cmd, rdprotect, 10);
out:
TRACE_EXIT_RES(res);
return res;
}
/*
* Returns 0 on success or POSITIVE error code otherwise (to match
* scst_get_cdb_info() semantic)
*/
static int __scst_parse_wrprotect(struct scst_cmd *cmd, int wrprotect,
int wrprotect_offs)
{
int res = 0;
struct scst_device *dev = cmd->dev;
TRACE_ENTRY();
TRACE_DBG("wrprotect %x", wrprotect);
EXTRACHECKS_BUG_ON(dev->dev_dif_type == 0);
switch (wrprotect) {
case 0:
cmd->cmd_dif_actions = dev->dev_dif_wr_prot0_actions |
SCST_DIF_CHECK_GUARD_TAG | dev->dif_app_chk |
dev->dif_ref_chk;
break;
case 1:
cmd->cmd_dif_actions = dev->dev_dif_wr_actions |
SCST_DIF_CHECK_GUARD_TAG | dev->dif_app_chk |
dev->dif_ref_chk;
cmd->tgt_dif_data_expected = 1;
break;
case 2:
cmd->cmd_dif_actions = dev->dev_dif_wr_actions |
dev->dif_app_chk | dev->dif_ref_chk;
cmd->tgt_dif_data_expected = 1;
break;
case 3:
cmd->cmd_dif_actions = dev->dev_dif_wr_actions;
cmd->tgt_dif_data_expected = 1;
break;
case 4:
cmd->cmd_dif_actions = dev->dev_dif_wr_actions |
SCST_DIF_CHECK_GUARD_TAG;
cmd->tgt_dif_data_expected = 1;
break;
case 5:
cmd->cmd_dif_actions = dev->dev_dif_wr_actions |
SCST_DIF_CHECK_GUARD_TAG | dev->dif_app_chk |
dev->dif_ref_chk;
cmd->tgt_dif_data_expected = 1;
break;
default:
TRACE(TRACE_SCSI|TRACE_MINOR, "Invalid WRPROTECT value %x "
"(dev %s, cmd %p)", wrprotect, dev->virt_name, cmd);
scst_set_invalid_field_in_cdb(cmd, wrprotect_offs,
5|SCST_INVAL_FIELD_BIT_OFFS_VALID);
res = EINVAL;
goto out;
}
TRACE_DBG("cmd_dif_actions %x, tgt_dif_data_expected %d (cmd %p)",
cmd->cmd_dif_actions, cmd->tgt_dif_data_expected, cmd);
out:
TRACE_EXIT_RES(res);
return res;
}
/*
* Returns 0 on success or POSITIVE error code otherwise (to match
* scst_get_cdb_info() semantic)
*/
static int scst_parse_wrprotect(struct scst_cmd *cmd)
{
int res = 0;
int wrprotect = (cmd->cdb[1] & 0xE0) >> 5;
const struct scst_device *dev = cmd->dev;
TRACE_ENTRY();
if (dev->dev_dif_mode == SCST_DIF_MODE_NONE) {
if (likely(wrprotect == 0))
goto out;
TRACE(TRACE_SCSI|TRACE_MINOR, "WRPROTECT %x and no DIF "
"device %s (cmd %p)", wrprotect,
dev->virt_name, cmd);
scst_set_invalid_field_in_cdb(cmd, 1,
5|SCST_INVAL_FIELD_BIT_OFFS_VALID);
res = EINVAL;
goto out;
}
if (unlikely((dev->dev_dif_type == 2) && (wrprotect != 0))) {
TRACE(TRACE_SCSI|TRACE_MINOR, "Non-32-byte CDBs with non-zero "
"wrprotect (%d) are not allowed in DIF type 2 "
"(dev %s, cmd %p, op %s)", wrprotect, dev->virt_name,
cmd, scst_get_opcode_name(cmd));
scst_set_cmd_error(cmd,
SCST_LOAD_SENSE(scst_sense_invalid_opcode));
res = EINVAL;
goto out;
}
res = __scst_parse_wrprotect(cmd, wrprotect, 1);
out:
TRACE_EXIT_RES(res);
return res;
}
/*
* Returns 0 on success or POSITIVE error code otherwise (to match
* scst_get_cdb_info() semantic)
*/
static int scst_parse_wrprotect32(struct scst_cmd *cmd)
{
int res = 0;
int wrprotect = (cmd->cdb[10] & 0xE0) >> 5;
const struct scst_device *dev = cmd->dev;
TRACE_ENTRY();
if (unlikely(dev->dev_dif_type != 2)) {
TRACE(TRACE_SCSI|TRACE_MINOR, "32-byte CDBs are not "
"allowed in DIF type %d (dev %s, cmd %p, op %s)",
dev->dev_dif_type, dev->virt_name, cmd,
scst_get_opcode_name(cmd));
scst_set_cmd_error(cmd,
SCST_LOAD_SENSE(scst_sense_invalid_opcode));
res = EINVAL;
goto out;
}
res = __scst_parse_wrprotect(cmd, wrprotect, 10);
out:
TRACE_EXIT_RES(res);
return res;
}
/*
* Returns 0 on success or POSITIVE error code otherwise (to match
* scst_get_cdb_info() semantic)
*/
static int __scst_parse_vrprotect(struct scst_cmd *cmd, int vrprotect_offs)
{
int res = 0;
struct scst_device *dev = cmd->dev;
int vrprotect = (cmd->cdb[vrprotect_offs] & 0xE0) >> 5;
int bytchk = (cmd->cdb[vrprotect_offs] & 6) >> 1;
TRACE_ENTRY();
TRACE_DBG("vrprotect %x", vrprotect);
EXTRACHECKS_BUG_ON(dev->dev_dif_type == 0);
switch (bytchk) {
case 0:
switch (vrprotect) {
case 0:
if (dev->dpicz) {
cmd->cmd_dif_actions = 0;
break;
}
fallthrough;
case 1:
case 5:
cmd->cmd_dif_actions = SCST_DIF_CHECK_GUARD_TAG |
dev->dif_app_chk | dev->dif_ref_chk;
break;
case 2:
cmd->cmd_dif_actions = dev->dif_app_chk | dev->dif_ref_chk;
break;
case 3:
cmd->cmd_dif_actions = 0;
break;
case 4:
cmd->cmd_dif_actions = SCST_DIF_CHECK_GUARD_TAG;
break;
default:
TRACE(TRACE_SCSI|TRACE_MINOR, "Invalid VRPROTECT value %x "
"(dev %s, cmd %p)", vrprotect, dev->virt_name, cmd);
scst_set_invalid_field_in_cdb(cmd, vrprotect_offs,
5|SCST_INVAL_FIELD_BIT_OFFS_VALID);
res = EINVAL;
goto out;
}
break;
case 1:
case 3:
switch (vrprotect) {
case 0:
if (dev->dpicz)
cmd->cmd_dif_actions = 0;
else
cmd->cmd_dif_actions = dev->dev_dif_wr_actions |
SCST_DIF_CHECK_GUARD_TAG | dev->dif_app_chk |
dev->dif_ref_chk;
break;
case 1:
case 2:
case 3:
case 4:
case 5:
cmd->cmd_dif_actions = 0;
break;
default:
TRACE(TRACE_SCSI|TRACE_MINOR, "Invalid VRPROTECT value %x "
"(dev %s, cmd %p)", vrprotect, dev->virt_name, cmd);
scst_set_invalid_field_in_cdb(cmd, vrprotect_offs,
5|SCST_INVAL_FIELD_BIT_OFFS_VALID);
res = EINVAL;
goto out;
}
break;
default:
sBUG_ON(1);
break;
}
TRACE_DBG("cmd_dif_actions %x, tgt_dif_data_expected %d (cmd %p, "
"bytchk %d)", cmd->cmd_dif_actions, cmd->tgt_dif_data_expected,
cmd, bytchk);
out:
TRACE_EXIT_RES(res);
return res;
}
/*
* Returns 0 on success or POSITIVE error code otherwise (to match
* scst_get_cdb_info() semantic)
*/
static int scst_parse_vrprotect(struct scst_cmd *cmd)
{
int res = 0;
int vrprotect = (cmd->cdb[1] & 0xE0) >> 5;
const struct scst_device *dev = cmd->dev;
TRACE_ENTRY();
if (dev->dev_dif_mode == SCST_DIF_MODE_NONE) {
if (likely(vrprotect == 0))
goto out;
TRACE(TRACE_SCSI|TRACE_MINOR, "VRPROTECT %x and no DIF "
"device %s (cmd %p)", vrprotect,
dev->virt_name, cmd);
scst_set_invalid_field_in_cdb(cmd, 1,
5|SCST_INVAL_FIELD_BIT_OFFS_VALID);
res = EINVAL;
goto out;
}
if (unlikely((dev->dev_dif_type == 2) && (vrprotect != 0))) {
TRACE(TRACE_SCSI|TRACE_MINOR, "Non-32-byte CDBs with non-zero "
"vrprotect (%d) are not allowed in DIF type 2 "
"(dev %s, cmd %p, op %s)", vrprotect,
dev->virt_name, cmd, scst_get_opcode_name(cmd));
scst_set_cmd_error(cmd,
SCST_LOAD_SENSE(scst_sense_invalid_opcode));
res = EINVAL;
goto out;
}
res = __scst_parse_vrprotect(cmd, 1);
out:
TRACE_EXIT_RES(res);
return res;
}
/*
* Returns 0 on success or POSITIVE error code otherwise (to match
* scst_get_cdb_info() semantic)
*/
static int scst_parse_vrprotect32(struct scst_cmd *cmd)
{
int res = 0;
const struct scst_device *dev = cmd->dev;
TRACE_ENTRY();
if (unlikely(dev->dev_dif_type != 2)) {
TRACE(TRACE_SCSI|TRACE_MINOR, "32-byte CDBs are not "
"allowed in DIF type %d (dev %s, cmd %p, op %s)",
dev->dev_dif_type, dev->virt_name, cmd,
scst_get_opcode_name(cmd));
scst_set_cmd_error(cmd,
SCST_LOAD_SENSE(scst_sense_invalid_opcode));
res = EINVAL;
goto out;
}
res = __scst_parse_vrprotect(cmd, 10);
out:
TRACE_EXIT_RES(res);
return res;
}
/*
* So far we support the only variable length CDBs, 32 bytes SBC PI type 2
* commands, so 32 on the forth place is OK. Don't forget to change it
* adding in this group new commands with other lengths!
*/
static const int scst_cdb_length[8] = { 6, 10, 10, 32, 16, 12, 0, 0 };
#define SCST_CDB_GROUP(opcode) ((opcode >> 5) & 0x7)
#define SCST_GET_CDB_LEN(opcode) scst_cdb_length[SCST_CDB_GROUP(opcode)]
static int get_cdb_info_len_10(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
cmd->cdb_len = 10;
cmd->op_flags |= SCST_LBA_NOT_VALID;
cmd->lba = 0;
/* It supposed to be already zeroed */
EXTRACHECKS_BUG_ON(cmd->bufflen != 0);
cmd->data_len = cmd->bufflen;
return 0;
}
static int get_cdb_info_block_limit(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
cmd->op_flags |= SCST_LBA_NOT_VALID;
cmd->lba = 0;
cmd->bufflen = 6;
cmd->data_len = cmd->bufflen;
return 0;
}
static int get_cdb_info_read_capacity(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
cmd->op_flags |= SCST_LBA_NOT_VALID;
cmd->lba = 0;
cmd->bufflen = 8;
cmd->data_len = cmd->bufflen;
return 0;
}
static int get_cdb_info_serv_act_in(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
int res = 0;
TRACE_ENTRY();
cmd->lba = 0;
switch (cmd->cdb[1] & 0x1f) {
case SAI_READ_CAPACITY_16:
cmd->op_name = "READ CAPACITY(16)";
cmd->bufflen = get_unaligned_be32(&cmd->cdb[10]);
if (unlikely(cmd->bufflen & SCST_MAX_VALID_BUFFLEN_MASK))
goto out_inval_bufflen10;
cmd->op_flags |= SCST_IMPLICIT_HQ | SCST_LBA_NOT_VALID |
SCST_REG_RESERVE_ALLOWED |
SCST_WRITE_EXCL_ALLOWED |
SCST_EXCL_ACCESS_ALLOWED;
break;
case SAI_GET_LBA_STATUS:
cmd->op_name = "GET LBA STATUS";
cmd->lba = get_unaligned_be64(&cmd->cdb[2]);
cmd->bufflen = get_unaligned_be32(&cmd->cdb[10]);
cmd->op_flags |= SCST_WRITE_EXCL_ALLOWED;
break;
default:
cmd->op_flags |= SCST_UNKNOWN_LENGTH | SCST_LBA_NOT_VALID;
break;
}
cmd->data_len = cmd->bufflen;
out:
TRACE_EXIT_RES(res);
return res;
out_inval_bufflen10:
PRINT_ERROR("Too big bufflen %d (op %s)", cmd->bufflen,
scst_get_opcode_name(cmd));
scst_set_invalid_field_in_cdb(cmd, 10, 0);
res = 1;
goto out;
}
static int get_cdb_info_single(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
cmd->op_flags |= SCST_LBA_NOT_VALID;
cmd->lba = 0;
cmd->bufflen = 1;
cmd->data_len = cmd->bufflen;
return 0;
}
static int get_cdb_info_read_pos(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
int res = 0;
cmd->op_flags |= SCST_LBA_NOT_VALID;
cmd->lba = 0;
cmd->bufflen = get_unaligned_be16(cmd->cdb + sdbops->info_len_off);
switch (cmd->cdb[1] & 0x1f) {
case 0:
case 1:
cmd->bufflen = 20;
break;
case 6:
cmd->bufflen = 32;
break;
case 8:
cmd->bufflen = max(32, cmd->bufflen);
break;
default:
PRINT_ERROR("READ POSITION: Invalid service action %x",
cmd->cdb[1] & 0x1f);
goto out_inval_field1;
}
cmd->data_len = cmd->bufflen;
out:
return res;
out_inval_field1:
scst_set_invalid_field_in_cdb(cmd, 1, 0);
res = 1;
goto out;
}
static int get_cdb_info_prevent_allow_medium_removal(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
cmd->op_flags |= SCST_LBA_NOT_VALID;
cmd->lba = 0;
cmd->data_len = 0;
/* It supposed to be already zeroed */
EXTRACHECKS_BUG_ON(cmd->bufflen != 0);
if ((cmd->cdb[4] & 3) == 0)
cmd->op_flags |= SCST_REG_RESERVE_ALLOWED |
SCST_WRITE_EXCL_ALLOWED | SCST_EXCL_ACCESS_ALLOWED;
return 0;
}
static int get_cdb_info_start_stop(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
cmd->op_flags |= SCST_LBA_NOT_VALID;
cmd->lba = 0;
cmd->data_len = 0;
/* It supposed to be already zeroed */
EXTRACHECKS_BUG_ON(cmd->bufflen != 0);
if ((cmd->cdb[4] & 0xF1) == 0x1)
cmd->op_flags |= SCST_REG_RESERVE_ALLOWED |
SCST_WRITE_EXCL_ALLOWED | SCST_EXCL_ACCESS_ALLOWED;
return 0;
}
static int get_cdb_info_len_3_read_elem_stat(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
cmd->op_flags |= SCST_LBA_NOT_VALID;
cmd->lba = 0;
cmd->bufflen = get_unaligned_be24(cmd->cdb + sdbops->info_len_off);
cmd->data_len = cmd->bufflen;
if ((cmd->cdb[6] & 0x2) == 0x2)
cmd->op_flags |= SCST_REG_RESERVE_ALLOWED |
SCST_WRITE_EXCL_ALLOWED | SCST_EXCL_ACCESS_ALLOWED;
return 0;
}
static int get_cdb_info_bidi_lba_4_len_2(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
cmd->lba = get_unaligned_be32(cmd->cdb + sdbops->info_lba_off);
cmd->bufflen = get_unaligned_be16(cmd->cdb + sdbops->info_len_off);
cmd->data_len = cmd->bufflen;
cmd->out_bufflen = cmd->bufflen;
return 0;
}
static int get_cdb_info_fmt(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
cmd->op_flags |= SCST_LBA_NOT_VALID;
cmd->lba = 0;
if (cmd->cdb[1] & 0x10/*FMTDATA*/) {
cmd->data_direction = SCST_DATA_WRITE;
cmd->op_flags |= SCST_UNKNOWN_LENGTH;
cmd->bufflen = 4096; /* guess */
} else
cmd->bufflen = 0;
cmd->data_len = cmd->bufflen;
return 0;
}
static int get_cdb_info_verify10(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
if (unlikely(cmd->cdb[1] & 4)) {
PRINT_ERROR("VERIFY(10): BYTCHK 1x not supported (dev %s)",
cmd->dev ? cmd->dev->virt_name : NULL);
scst_set_invalid_field_in_cdb(cmd, 1,
2 | SCST_INVAL_FIELD_BIT_OFFS_VALID);
return 1;
}
cmd->lba = get_unaligned_be32(cmd->cdb + sdbops->info_lba_off);
if (cmd->cdb[1] & 2) {
cmd->bufflen = get_unaligned_be16(cmd->cdb + sdbops->info_len_off);
cmd->data_len = cmd->bufflen;
cmd->data_direction = SCST_DATA_WRITE;
} else {
cmd->bufflen = 0;
cmd->data_len = get_unaligned_be16(cmd->cdb + sdbops->info_len_off);
cmd->data_direction = SCST_DATA_NONE;
}
return scst_parse_vrprotect(cmd);
}
static int get_cdb_info_verify6(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
cmd->op_flags |= SCST_LBA_NOT_VALID;
cmd->lba = 0;
if (unlikely(cmd->cdb[1] & 4)) {
PRINT_ERROR("VERIFY(6): BYTCHK 1x not supported (dev %s)",
cmd->dev ? cmd->dev->virt_name : NULL);
scst_set_invalid_field_in_cdb(cmd, 1,
2 | SCST_INVAL_FIELD_BIT_OFFS_VALID);
return 1;
}
if (cmd->cdb[1] & 2) { /* BYTCHK 01 */
cmd->bufflen = get_unaligned_be24(cmd->cdb + sdbops->info_len_off);
cmd->data_len = cmd->bufflen;
cmd->data_direction = SCST_DATA_WRITE;
} else {
cmd->bufflen = 0;
cmd->data_len = get_unaligned_be24(cmd->cdb + sdbops->info_len_off);
cmd->data_direction = SCST_DATA_NONE;
}
return 0;
}
static int get_cdb_info_verify12(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
if (unlikely(cmd->cdb[1] & 4)) {
PRINT_ERROR("VERIFY(12): BYTCHK 1x not supported (dev %s)",
cmd->dev ? cmd->dev->virt_name : NULL);
scst_set_invalid_field_in_cdb(cmd, 1,
2 | SCST_INVAL_FIELD_BIT_OFFS_VALID);
return 1;
}
cmd->lba = get_unaligned_be32(cmd->cdb + sdbops->info_lba_off);
if (cmd->cdb[1] & 2) { /* BYTCHK 01 */
cmd->bufflen = get_unaligned_be32(cmd->cdb + sdbops->info_len_off);
cmd->data_len = cmd->bufflen;
cmd->data_direction = SCST_DATA_WRITE;
} else {
cmd->bufflen = 0;
cmd->data_len = get_unaligned_be32(cmd->cdb + sdbops->info_len_off);
cmd->data_direction = SCST_DATA_NONE;
}
return scst_parse_vrprotect(cmd);
}
static int get_cdb_info_verify16(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
if (unlikely(cmd->cdb[1] & 4)) {
PRINT_ERROR("VERIFY(16): BYTCHK 1x not supported (dev %s)",
cmd->dev ? cmd->dev->virt_name : NULL);
scst_set_invalid_field_in_cdb(cmd, 1,
2 | SCST_INVAL_FIELD_BIT_OFFS_VALID);
return 1;
}
cmd->lba = get_unaligned_be64(cmd->cdb + sdbops->info_lba_off);
if (cmd->cdb[1] & 2) { /* BYTCHK 01 */
cmd->bufflen = get_unaligned_be32(cmd->cdb + sdbops->info_len_off);
cmd->data_len = cmd->bufflen;
cmd->data_direction = SCST_DATA_WRITE;
} else {
cmd->bufflen = 0;
cmd->data_len = get_unaligned_be32(cmd->cdb + sdbops->info_len_off);
cmd->data_direction = SCST_DATA_NONE;
}
return scst_parse_vrprotect(cmd);
}
static int get_cdb_info_verify32(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
if (unlikely(cmd->cdb[10] & 4)) {
PRINT_ERROR("VERIFY(16): BYTCHK 1x not supported (dev %s)",
cmd->dev ? cmd->dev->virt_name : NULL);
scst_set_invalid_field_in_cdb(cmd, 1,
2 | SCST_INVAL_FIELD_BIT_OFFS_VALID);
return 1;
}
cmd->lba = get_unaligned_be64(cmd->cdb + sdbops->info_lba_off);
if (cmd->cdb[10] & 2) {
cmd->bufflen = get_unaligned_be32(cmd->cdb + sdbops->info_len_off);
cmd->data_len = cmd->bufflen;
cmd->data_direction = SCST_DATA_WRITE;
} else {
cmd->bufflen = 0;
cmd->data_len = get_unaligned_be32(cmd->cdb + sdbops->info_len_off);
cmd->data_direction = SCST_DATA_NONE;
}
return scst_parse_vrprotect32(cmd);
}
static int get_cdb_info_len_1(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
cmd->op_flags |= SCST_LBA_NOT_VALID;
cmd->lba = 0;
cmd->bufflen = cmd->cdb[sdbops->info_len_off];
cmd->data_len = cmd->bufflen;
return 0;
}
static inline int get_cdb_info_lba_3_len_1_256(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
cmd->lba = (cmd->cdb[sdbops->info_lba_off] & 0x1F) << 16;
cmd->lba |= get_unaligned_be16(cmd->cdb + sdbops->info_lba_off + 1);
/*
* From the READ(6) specification: a TRANSFER LENGTH field set to zero
* specifies that 256 logical blocks shall be read.
*
* Note: while the C standard specifies that the behavior of a
* computation with signed integers that overflows is undefined, the
* same standard guarantees that the result of a computation with
* unsigned integers that cannot be represented will yield the value
* is reduced modulo the largest value that can be represented by the
* resulting type.
*/
cmd->bufflen = (u8)(cmd->cdb[sdbops->info_len_off] - 1) + 1;
cmd->data_len = cmd->bufflen;
return 0;
}
static int get_cdb_info_lba_3_len_1_256_read(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
int res = get_cdb_info_lba_3_len_1_256(cmd, sdbops);
if (res != 0)
goto out;
else {
struct scst_device *dev = cmd->dev;
if ((dev->dev_dif_mode != SCST_DIF_MODE_NONE) && !dev->dpicz)
cmd->cmd_dif_actions = dev->dev_dif_rd_prot0_actions |
SCST_DIF_CHECK_GUARD_TAG | dev->dif_app_chk |
SCST_DIF_CHECK_REF_TAG;
}
out:
return res;
}
static int get_cdb_info_lba_3_len_1_256_write(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
int res = get_cdb_info_lba_3_len_1_256(cmd, sdbops);
if (res != 0)
goto out;
else {
struct scst_device *dev = cmd->dev;
if (dev->dev_dif_mode != SCST_DIF_MODE_NONE)
cmd->cmd_dif_actions = dev->dev_dif_wr_prot0_actions |
SCST_DIF_CHECK_GUARD_TAG | dev->dif_app_chk |
SCST_DIF_CHECK_REF_TAG;
}
out:
return res;
}
static int get_cdb_info_len_2(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
cmd->op_flags |= SCST_LBA_NOT_VALID;
cmd->lba = 0;
cmd->bufflen = get_unaligned_be16(cmd->cdb + sdbops->info_len_off);
cmd->data_len = cmd->bufflen;
return 0;
}
static int get_cdb_info_len_3(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
cmd->op_flags |= SCST_LBA_NOT_VALID;
cmd->lba = 0;
cmd->bufflen = get_unaligned_be24(cmd->cdb + sdbops->info_len_off);
cmd->data_len = cmd->bufflen;
return 0;
}
static int get_cdb_info_len_4(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
cmd->op_flags |= SCST_LBA_NOT_VALID;
cmd->lba = 0;
cmd->bufflen = get_unaligned_be32(cmd->cdb + sdbops->info_len_off);
cmd->data_len = cmd->bufflen;
return 0;
}
static int get_cdb_info_none(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
cmd->op_flags |= SCST_LBA_NOT_VALID;
cmd->lba = 0;
/* It supposed to be already zeroed */
EXTRACHECKS_BUG_ON(cmd->bufflen != 0);
cmd->data_len = cmd->bufflen;
return 0;
}
static int get_cdb_info_lba_2_none(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
cmd->lba = get_unaligned_be16(cmd->cdb + sdbops->info_lba_off);
/* It supposed to be already zeroed */
EXTRACHECKS_BUG_ON(cmd->bufflen != 0);
cmd->data_len = cmd->bufflen;
return 0;
}
static int get_cdb_info_lba_4_none(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
cmd->lba = get_unaligned_be32(cmd->cdb + sdbops->info_lba_off);
/* It supposed to be already zeroed */
EXTRACHECKS_BUG_ON(cmd->bufflen != 0);
cmd->data_len = cmd->bufflen;
return 0;
}
static int get_cdb_info_lba_8_none(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
cmd->lba = get_unaligned_be64(cmd->cdb + sdbops->info_lba_off);
/* It supposed to be already zeroed */
EXTRACHECKS_BUG_ON(cmd->bufflen != 0);
cmd->data_len = cmd->bufflen;
return 0;
}
static int get_cdb_info_lba_4_len_2(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
cmd->lba = get_unaligned_be32(cmd->cdb + sdbops->info_lba_off);
cmd->bufflen = get_unaligned_be16(cmd->cdb + sdbops->info_len_off);
cmd->data_len = cmd->bufflen;
return 0;
}
static int get_cdb_info_read_10(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
int res = get_cdb_info_lba_4_len_2(cmd, sdbops);
if (res != 0)
return res;
else {
#ifdef CONFIG_SCST_DIF_INJECT_CORRUPTED_TAGS
EXTRACHECKS_BUG_ON(cmd->cdb[0] != READ_10);
cmd->cmd_corrupt_dif_tag = (cmd->cdb[6] & 0xE0) >> 5;
#endif
return scst_parse_rdprotect(cmd);
}
}
static int get_cdb_info_lba_4_len_2_wrprotect(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
int res = get_cdb_info_lba_4_len_2(cmd, sdbops);
if (res != 0)
return res;
else
return scst_parse_wrprotect(cmd);
}
static inline int get_cdb_info_lba_4_len_4(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
cmd->lba = get_unaligned_be32(cmd->cdb + sdbops->info_lba_off);
cmd->bufflen = get_unaligned_be32(cmd->cdb + sdbops->info_len_off);
cmd->data_len = cmd->bufflen;
return 0;
}
static int get_cdb_info_lba_4_len_4_rdprotect(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
int res = get_cdb_info_lba_4_len_4(cmd, sdbops);
if (res != 0)
return res;
else
return scst_parse_rdprotect(cmd);
}
static int get_cdb_info_lba_4_len_4_wrprotect(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
int res = get_cdb_info_lba_4_len_4(cmd, sdbops);
if (res != 0)
return res;
else
return scst_parse_wrprotect(cmd);
}
static inline int get_cdb_info_lba_8_len_4(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
cmd->lba = get_unaligned_be64(cmd->cdb + sdbops->info_lba_off);
cmd->bufflen = get_unaligned_be32(cmd->cdb + sdbops->info_len_off);
cmd->data_len = cmd->bufflen;
return 0;
}
static int get_cdb_info_read_16(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
int res = get_cdb_info_lba_8_len_4(cmd, sdbops);
if (res != 0)
return res;
else {
#ifdef CONFIG_SCST_DIF_INJECT_CORRUPTED_TAGS
EXTRACHECKS_BUG_ON(cmd->cdb[0] != READ_16);
cmd->cmd_corrupt_dif_tag = (cmd->cdb[14] & 0xE0) >> 5;
#endif
return scst_parse_rdprotect(cmd);
}
}
static int get_cdb_info_lba_8_len_4_wrprotect(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
int res = get_cdb_info_lba_8_len_4(cmd, sdbops);
if (res != 0)
return res;
else
return scst_parse_wrprotect(cmd);
}
static int get_cdb_info_lba_8_len_4_wrprotect32(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
int res = get_cdb_info_lba_8_len_4(cmd, sdbops);
if (res != 0)
return res;
else
return scst_parse_wrprotect32(cmd);
}
static int get_cdb_info_lba_8_len_4_rdprotect32(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
int res = get_cdb_info_lba_8_len_4(cmd, sdbops);
if (res != 0)
return res;
else
return scst_parse_rdprotect32(cmd);
}
static int get_cdb_info_write_same(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops,
const bool ndob)
{
const uint8_t ctrl_offs = cmd->cdb_len < 32 ? 1 : 10;
const bool anchor = (cmd->cdb[ctrl_offs] >> 4) & 1;
const bool unmap = (cmd->cdb[ctrl_offs] >> 3) & 1;
if (!unmap && (anchor || ndob)) {
PRINT_ERROR("Received invalid %s command (UNMAP = %d;"
" ANCHOR = %d; NDOB = %d)",
scst_get_opcode_name(cmd), unmap, anchor, ndob);
scst_set_invalid_field_in_cdb(cmd, ctrl_offs,
SCST_INVAL_FIELD_BIT_OFFS_VALID | (ndob ? 0 : 4));
return 1;
}
if (ndob) {
cmd->bufflen = 0;
cmd->data_direction = SCST_DATA_NONE;
} else {
cmd->bufflen = 1;
cmd->data_direction = SCST_DATA_WRITE;
}
return cmd->cdb_len < 32 ? scst_parse_wrprotect(cmd) :
scst_parse_wrprotect32(cmd);
}
static int get_cdb_info_write_same10(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
cmd->lba = get_unaligned_be32(cmd->cdb + sdbops->info_lba_off);
cmd->data_len = get_unaligned_be16(cmd->cdb + sdbops->info_len_off);
return get_cdb_info_write_same(cmd, sdbops, false);
}
static int get_cdb_info_write_same16(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
cmd->lba = get_unaligned_be64(cmd->cdb + sdbops->info_lba_off);
cmd->data_len = get_unaligned_be32(cmd->cdb + sdbops->info_len_off);
return get_cdb_info_write_same(cmd, sdbops, cmd->cdb[1] & 1 /*NDOB*/);
}
static int get_cdb_info_write_same32(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
cmd->lba = get_unaligned_be64(cmd->cdb + sdbops->info_lba_off);
cmd->data_len = get_unaligned_be32(cmd->cdb + sdbops->info_len_off);
return get_cdb_info_write_same(cmd, sdbops, cmd->cdb[10] & 1 /*NDOB*/);
}
/**
* scst_set_cmd_from_cdb_info() - Parse the SCSI CDB.
* @cmd: SCSI command to parse.
* @ptr: Pointer to the function that will be used to parse @cmd.
*
* Return: 0 on success or >0 if the SCSI command is invalid.
*/
static int scst_set_cmd_from_cdb_info(struct scst_cmd *cmd,
const struct scst_sdbops *ptr)
{
cmd->cdb_len = SCST_GET_CDB_LEN(cmd->cdb[0]);
cmd->cmd_naca = (cmd->cdb[cmd->cdb_len - 1] & CONTROL_BYTE_NACA_BIT);
cmd->cmd_linked = (cmd->cdb[cmd->cdb_len - 1] & CONTROL_BYTE_LINK_BIT);
cmd->op_name = ptr->info_op_name;
cmd->data_direction = ptr->info_data_direction;
cmd->op_flags = ptr->info_op_flags | SCST_INFO_VALID;
cmd->lba_off = ptr->info_lba_off;
cmd->lba_len = ptr->info_lba_len;
cmd->len_off = ptr->info_len_off;
cmd->len_len = ptr->info_len_len;
return (*ptr->get_cdb_info)(cmd, ptr);
}
static int get_cdb_info_var_len(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
int res;
/*
* !! Indexed by (cdb[8-9] - SUBCODE_READ_32), the smallest subcode,
* !! hence all items in the array MUST be sorted and with NO HOLES
* !! in ops field!
*/
static const struct scst_sdbops scst_scsi_op32_table[] = {
{.ops = 0x7F, .devkey = "O ",
.info_op_name = "READ(32)",
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|
#ifdef CONFIG_SCST_TEST_IO_IN_SIRQ
SCST_TEST_IO_IN_SIRQ_ALLOWED|
#endif
SCST_WRITE_EXCL_ALLOWED,
.info_lba_off = 12, .info_lba_len = 8,
.info_len_off = 28, .info_len_len = 4,
.get_cdb_info = get_cdb_info_lba_8_len_4_rdprotect32},
{.ops = 0x7F, .devkey = "O ",
.info_op_name = "VERIFY(32)",
.info_data_direction = SCST_DATA_UNKNOWN,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_EXCL_ALLOWED,
.info_lba_off = 12, .info_lba_len = 8,
.info_len_off = 28, .info_len_len = 4,
.get_cdb_info = get_cdb_info_verify32},
{.ops = 0x7F, .devkey = "O ",
.info_op_name = "WRITE(32)",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|
#ifdef CONFIG_SCST_TEST_IO_IN_SIRQ
SCST_TEST_IO_IN_SIRQ_ALLOWED|
#endif
SCST_WRITE_MEDIUM,
.info_lba_off = 12, .info_lba_len = 8,
.info_len_off = 28, .info_len_len = 4,
.get_cdb_info = get_cdb_info_lba_8_len_4_wrprotect32},
{.ops = 0x7F, .devkey = "O ",
.info_op_name = "WRITE AND VERIFY(32)",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM,
.info_lba_off = 12, .info_lba_len = 8,
.info_len_off = 28, .info_len_len = 4,
.get_cdb_info = get_cdb_info_lba_8_len_4_wrprotect32},
{.ops = 0x7F, .devkey = "O ",
.info_op_name = "WRITE SAME(32)",
.info_data_direction = SCST_DATA_WRITE,
.info_op_flags = SCST_TRANSFER_LEN_TYPE_FIXED|SCST_WRITE_MEDIUM,
.info_lba_off = 12, .info_lba_len = 8,
.info_len_off = 28, .info_len_len = 4,
.get_cdb_info = get_cdb_info_write_same32},
};
const struct scst_sdbops *ptr;
int subcode = be16_to_cpu(*(__be16 *)&cmd->cdb[8]);
unsigned int i = subcode - SUBCODE_READ_32;
EXTRACHECKS_BUG_ON(cmd->cdb[0] != 0x7F);
EXTRACHECKS_BUG_ON(sdbops->ops != 0x7F);
/* i is unsigned, so this will handle subcodes < READ_32 as well */
if (unlikely(i >= ARRAY_SIZE(scst_scsi_op32_table))) {
TRACE(TRACE_MINOR, "Too big cmd index %d for 0x7F CDB (cmd %p)",
i, cmd);
goto out_unknown;
}
ptr = &scst_scsi_op32_table[i];
#if 0 /* not possible */
if (unlikely(ptr == NULL))
goto out_unknown;
#endif
if (unlikely(cmd->cdb[7] != 0x18)) {
TRACE(TRACE_MINOR, "Incorrect ADDITIONAL CDB LENGTH %d for "
"0x7F CDB (cmd %p)", cmd->cdb[7], cmd);
cmd->op_flags |= SCST_LBA_NOT_VALID;
scst_set_invalid_field_in_cdb(cmd, 7, 0);
res = 1; /* command invalid */
goto out;
}
res = scst_set_cmd_from_cdb_info(cmd, ptr);
cmd->cmd_naca = (cmd->cdb[1] & CONTROL_BYTE_NACA_BIT);
cmd->cmd_linked = (cmd->cdb[1] & CONTROL_BYTE_LINK_BIT);
out:
TRACE_EXIT_RES(res);
return res;
out_unknown:
TRACE(TRACE_MINOR, "Unknown opcode 0x%x, subcode %d for type %d",
cmd->cdb[0], subcode, cmd->dev->type);
cmd->op_flags &= ~SCST_INFO_VALID;
res = -1; /* command unknown */
goto out;
}
static int get_cdb_info_compare_and_write(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
cmd->lba = get_unaligned_be64(cmd->cdb + sdbops->info_lba_off);
cmd->data_len = cmd->cdb[sdbops->info_len_off];
cmd->bufflen = 2 * cmd->data_len;
return scst_parse_wrprotect(cmd);
}
static int get_cdb_info_ext_copy(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
if (unlikely(cmd->cdb[1] != 0)) {
PRINT_WARNING("Not supported %s service action 0x%x",
scst_get_opcode_name(cmd), cmd->cdb[1]);
scst_set_invalid_field_in_cdb(cmd, 1,
0 | SCST_INVAL_FIELD_BIT_OFFS_VALID);
return 1;
}
return get_cdb_info_len_4(cmd, sdbops);
}
/*
* get_cdb_info_apt() - Parse ATA PASS-THROUGH CDB.
*
* Parse ATA PASS-THROUGH(12) and ATA PASS-THROUGH(16). See also SAT-3 for a
* detailed description of these commands.
*/
static int get_cdb_info_apt(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
const u8 *const cdb = cmd->cdb;
const u8 op = cdb[0];
const u8 extend = cdb[1] & 1;
const u8 multiple = cdb[1] >> 5;
const u8 protocol = (cdb[1] >> 1) & 0xf;
const u8 t_type = (cdb[2] >> 4) & 1;
const u8 t_dir = (cdb[2] >> 3) & 1;
const u8 byte_block = (cdb[2] >> 2) & 1;
const u8 t_length = cdb[2] & 3;
int bufflen = 0;
/*
* If the PROTOCOL field contains Fh (i.e., Return Response
* Information), then the SATL shall ignore all fields in the CDB
* except for the PROTOCOL field.
*/
if (protocol == 0xf)
goto out;
switch (op) {
case ATA_12:
switch (t_length) {
case 0:
bufflen = 0;
break;
case 1:
bufflen = cdb[3];
break;
case 2:
bufflen = cdb[4];
break;
case 3:
/*
* Not yet implemented: "The transfer length is an
* unsigned integer specified in the TPSIU (see
* 3.1.97)."
*/
WARN_ON(true);
break;
}
break;
case ATA_16:
switch (t_length) {
case 0:
bufflen = 0;
break;
case 1:
bufflen = extend ? get_unaligned_be16(&cdb[3]) : cdb[4];
break;
case 2:
bufflen = extend ? get_unaligned_be16(&cdb[5]) : cdb[6];
break;
case 3:
WARN_ON(true);
break;
}
break;
}
/* See also "Table 133 - Mapping of BYTE_BLOCK, T_TYPE, and T_LENGTH" */
cmd->cdb_len = SCST_GET_CDB_LEN(op);
if (t_length != 0 && byte_block != 0) {
/*
* "The number of ATA logical sector size (see 3.1.16) blocks
* to be transferred"
*/
bufflen *= t_type ? cmd->dev->block_size : 512;
}
/*
* If the T_DIR bit is set to zero, then the SATL shall transfer data
* from the application client to the ATA device. If the T_DIR bit is
* set to one, then the SATL shall transfer data from the ATA device
* to the application client. The SATL shall ignore the T_DIR bit if
* the T_LENGTH field is set to zero.
*/
cmd->data_direction = (t_length == 0 ? SCST_DATA_NONE : t_dir ?
SCST_DATA_READ : SCST_DATA_WRITE);
cmd->lba = 0;
cmd->bufflen = bufflen << multiple;
cmd->data_len = cmd->bufflen;
out:
cmd->op_flags = SCST_INFO_VALID;
return 0;
}
/* Parse MAINTENANCE IN */
static int get_cdb_info_min(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
switch (cmd->cdb[1] & 0x1f) {
case MI_REPORT_IDENTIFYING_INFORMATION:
cmd->op_name = "REPORT IDENTIFYING INFORMATION";
cmd->op_flags |= SCST_REG_RESERVE_ALLOWED |
SCST_WRITE_EXCL_ALLOWED | SCST_EXCL_ACCESS_ALLOWED;
break;
case MI_REPORT_TARGET_PGS:
cmd->op_name = "REPORT TARGET PORT GROUPS";
cmd->op_flags |= SCST_LOCAL_CMD | SCST_REG_RESERVE_ALLOWED |
SCST_WRITE_EXCL_ALLOWED | SCST_EXCL_ACCESS_ALLOWED;
break;
case MI_REPORT_SUPPORTED_OPERATION_CODES:
cmd->op_name = "REPORT SUPPORTED OPERATION CODES";
cmd->op_flags |= SCST_WRITE_EXCL_ALLOWED;
if (cmd->devt->get_supported_opcodes != NULL)
cmd->op_flags |= SCST_LOCAL_CMD | SCST_FULLY_LOCAL_CMD;
break;
case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
cmd->op_name = "REPORT SUPPORTED TASK MANAGEMENT FUNCTIONS";
cmd->op_flags |= SCST_WRITE_EXCL_ALLOWED |
SCST_LOCAL_CMD | SCST_FULLY_LOCAL_CMD;
break;
default:
break;
}
return get_cdb_info_len_4(cmd, sdbops);
}
/* Parse MAINTENANCE (OUT) */
static int get_cdb_info_mo(struct scst_cmd *cmd,
const struct scst_sdbops *sdbops)
{
switch (cmd->cdb[1] & 0x1f) {
case MO_SET_TARGET_PGS:
{
unsigned long flags;
cmd->op_name = "SET TARGET PORT GROUPS";
cmd->op_flags |= SCST_LOCAL_CMD | SCST_STRICTLY_SERIALIZED;
spin_lock_irqsave(&scst_global_stpg_list_lock, flags);
TRACE_DBG("Adding STPG cmd %p to global_stpg_list", cmd);
cmd->cmd_on_global_stpg_list = 1;
list_add_tail(&cmd->global_stpg_list_entry, &scst_global_stpg_list);
spin_unlock_irqrestore(&scst_global_stpg_list_lock, flags);
break;
}
}
return get_cdb_info_len_4(cmd, sdbops);
}
/**
* scst_get_cdb_info() - Parse the SCSI CDB according to the SCSI device type.
* @cmd: SCSI command to parse.
*
* Description:
* Fill in the following fields in @cmd: cdb_len, cmd_naca,
* cmd_linked, op_name, data_direction, op_flags, lba_off, lba_len,
* len_off, len_len, data_direction, lba, data_len, ...
* Sets SCST_LBA_NOT_VALID if the CDB has not been recognized.
*
* Return: 0 on success, < 0 if the CDB is not recognized, > 0 if the CDB has
* been recognized but is invalid.
*/
int scst_get_cdb_info(struct scst_cmd *cmd)
{
int dev_type = cmd->dev->type;
int i, res = 0;
uint8_t op;
const struct scst_sdbops *ptr = NULL;
TRACE_ENTRY();
op = cmd->cdb[0]; /* get clear opcode */
TRACE_DBG("opcode=%02x, cdblen=%d bytes, dev_type=%d", op,
SCST_GET_CDB_LEN(op), dev_type);
i = scst_scsi_op_list[op];
while (i < SCST_CDB_TBL_SIZE && scst_scsi_op_table[i].ops == op) {
if (scst_scsi_op_table[i].devkey[dev_type] != SCST_CDB_NOTSUPP) {
ptr = &scst_scsi_op_table[i];
TRACE_DBG("op = 0x%02x+'%c%c%c%c%c%c%c%c%c%c'+<%s>",
ptr->ops, ptr->devkey[0], /* disk */
ptr->devkey[1], /* tape */
ptr->devkey[2], /* printer */
ptr->devkey[3], /* cpu */
ptr->devkey[4], /* cdr */
ptr->devkey[5], /* cdrom */
ptr->devkey[6], /* scanner */
ptr->devkey[7], /* worm */
ptr->devkey[8], /* changer */
ptr->devkey[9], /* commdev */
ptr->info_op_name);
TRACE_DBG("data direction %d, op flags 0x%x, lba off %d, "
"lba len %d, len off %d, len len %d",
ptr->info_data_direction, ptr->info_op_flags,
ptr->info_lba_off, ptr->info_lba_len,
ptr->info_len_off, ptr->info_len_len);
break;
}
i++;
}
if (unlikely(ptr == NULL)) {
/* opcode not found or now not used */
TRACE(TRACE_MINOR, "Unknown opcode 0x%x for type %d", op,
dev_type);
cmd->op_flags |= SCST_LBA_NOT_VALID;
res = -1;
goto out;
}
res = scst_set_cmd_from_cdb_info(cmd, ptr);
out:
TRACE_EXIT_RES(res);
return res;
}
EXPORT_SYMBOL_GPL(scst_get_cdb_info);
/* Packs SCST LUN back to SCSI form */
__be64 scst_pack_lun(const uint64_t lun, enum scst_lun_addr_method addr_method)
{
uint64_t res = 0;
if (lun) {
res = (addr_method << 14) | (lun & 0x3fff);
res = res << 48;
}
TRACE_EXIT_HRES(res >> 48);
return cpu_to_be64(res);
}
EXPORT_SYMBOL(scst_pack_lun);
/*
* Function to extract a LUN number from an 8-byte LUN structure in network byte
* order (big endian). Supports three LUN addressing methods: peripheral, flat
* and logical unit. See also SAM-2, section 4.9.4 (page 40).
*/
uint64_t scst_unpack_lun(const uint8_t *lun, int len)
{
uint64_t res = NO_SUCH_LUN;
int address_method;
TRACE_ENTRY();
TRACE_BUFF_FLAG(TRACE_DEBUG, "Raw LUN", lun, len);
switch (len) {
case 2:
break;
case 8:
if ((*((__be64 const *)lun) & cpu_to_be64(0x0000FFFFFFFFFFFFLL)) != 0)
goto out_err;
break;
case 4:
if (*((__be16 const *)&lun[2]) != 0)
goto out_err;
break;
case 6:
if (*((__be32 const *)&lun[2]) != 0)
goto out_err;
break;
case 1:
case 0:
PRINT_ERROR("Illegal lun length %d, expected 2 bytes "
"or more", len);
goto out;
default:
goto out_err;
}
address_method = (*lun) >> 6; /* high 2 bits of byte 0 */
switch (address_method) {
case SCST_LUN_ADDR_METHOD_PERIPHERAL:
case SCST_LUN_ADDR_METHOD_FLAT:
case SCST_LUN_ADDR_METHOD_LUN:
res = *(lun + 1) | (((*lun) & 0x3f) << 8);
break;
case SCST_LUN_ADDR_METHOD_EXTENDED_LUN:
default:
PRINT_ERROR("Unimplemented LUN addressing method %u",
address_method);
break;
}
out:
TRACE_EXIT_RES((int)res);
return res;
out_err:
PRINT_ERROR("%s", "Multi-level LUN unimplemented");
goto out;
}
EXPORT_SYMBOL(scst_unpack_lun);
/*
** Generic parse() support routines.
** Done via pointer on functions to avoid unneeded dereferences on
** the fast path.
**/
/*
* scst_calc_block_shift() - calculate block shift
*
* Calculates and returns block shift for the given sector size
*/
int scst_calc_block_shift(int sector_size)
{
int block_shift;
if (sector_size == 0)
sector_size = 512;
block_shift = ilog2(sector_size);
WARN_ONCE(1 << block_shift != sector_size, "1 << %d != %d\n",
block_shift, sector_size);
if (block_shift < 9) {
PRINT_ERROR("Wrong sector size %d", sector_size);
block_shift = -1;
}
TRACE_EXIT_RES(block_shift);
return block_shift;
}
EXPORT_SYMBOL_GPL(scst_calc_block_shift);
/*
* Test whether the result of a shift-left operation would be larger than
* what fits in a variable with the type of @a.
*/
#define shift_left_overflows(a, b) \
({ \
typeof(a) _minus_one = -1LL; \
typeof(a) _plus_one = 1; \
bool _a_is_signed = _minus_one < 0; \
int _shift = sizeof(a) * 8 - ((b) + _a_is_signed); \
_shift < 0 || ((a) & ~((_plus_one << _shift) - 1)) != 0;\
})
/*
* scst_generic_parse() - Generic parse() for devices supporting an LBA
*/
static inline int scst_generic_parse(struct scst_cmd *cmd, const int timeout[3])
{
const int block_shift = cmd->dev->block_shift;
int res = -EINVAL;
TRACE_ENTRY();
EXTRACHECKS_BUG_ON(block_shift < 0);
/*
* SCST sets good defaults for cmd->data_direction and cmd->bufflen,
* therefore change them only if necessary
*/
if (cmd->op_flags & SCST_TRANSFER_LEN_TYPE_FIXED) {
/*
* No need for locks here, since *_detach() can not be
* called, when there are existing commands.
*/
bool overflow = shift_left_overflows(cmd->bufflen, block_shift) ||
shift_left_overflows(cmd->data_len, block_shift) ||
shift_left_overflows(cmd->out_bufflen, block_shift);
if (unlikely(overflow)) {
PRINT_WARNING("bufflen %u, data_len %llu or out_bufflen"
" %u too large for device %s (block size"
" %u)", cmd->bufflen, cmd->data_len,
cmd->out_bufflen, cmd->dev->virt_name,
1 << block_shift);
PRINT_BUFFER("CDB", cmd->cdb, cmd->cdb_len);
scst_set_cmd_error(cmd, SCST_LOAD_SENSE(
scst_sense_block_out_range_error));
goto out;
}
cmd->bufflen = cmd->bufflen << block_shift;
cmd->data_len = cmd->data_len << block_shift;
cmd->out_bufflen = cmd->out_bufflen << block_shift;
}
if (unlikely(!(cmd->op_flags & SCST_LBA_NOT_VALID) &&
shift_left_overflows(cmd->lba, block_shift))) {
PRINT_WARNING("offset %llu * %u >= 2**63 for device %s (len %lld)",
cmd->lba, 1 << block_shift, cmd->dev->virt_name,
cmd->data_len);
scst_set_cmd_error(cmd, SCST_LOAD_SENSE(
scst_sense_block_out_range_error));
goto out;
}
cmd->timeout = timeout[cmd->op_flags & SCST_BOTH_TIMEOUTS];
res = 0;
out:
TRACE_DBG("res %d, bufflen %d, data_len %lld, direct %d", res,
cmd->bufflen, (long long)cmd->data_len, cmd->data_direction);
TRACE_EXIT_RES(res);
return res;
}
/*
* scst_sbc_generic_parse() - generic SBC parsing
*
* Generic parse() for SBC (disk) devices
*/
int scst_sbc_generic_parse(struct scst_cmd *cmd)
{
static const int disk_timeout[] = {
[0] = SCST_GENERIC_DISK_REG_TIMEOUT,
[SCST_SMALL_TIMEOUT] = SCST_GENERIC_DISK_SMALL_TIMEOUT,
[SCST_LONG_TIMEOUT] = SCST_GENERIC_DISK_LONG_TIMEOUT,
[SCST_BOTH_TIMEOUTS] = SCST_GENERIC_DISK_LONG_TIMEOUT,
};
BUILD_BUG_ON(SCST_SMALL_TIMEOUT != 1);
BUILD_BUG_ON(SCST_LONG_TIMEOUT != 2);
BUILD_BUG_ON(SCST_BOTH_TIMEOUTS != 3);
return scst_generic_parse(cmd, disk_timeout);
}
EXPORT_SYMBOL_GPL(scst_sbc_generic_parse);
/*
* scst_cdrom_generic_parse() - generic MMC parse
*
* Generic parse() for MMC (cdrom) devices
*/
int scst_cdrom_generic_parse(struct scst_cmd *cmd)
{
static const int cdrom_timeout[] = {
[0] = SCST_GENERIC_CDROM_REG_TIMEOUT,
[SCST_SMALL_TIMEOUT] = SCST_GENERIC_CDROM_SMALL_TIMEOUT,
[SCST_LONG_TIMEOUT] = SCST_GENERIC_CDROM_LONG_TIMEOUT,
[SCST_BOTH_TIMEOUTS] = SCST_GENERIC_CDROM_LONG_TIMEOUT,
};
BUILD_BUG_ON(SCST_SMALL_TIMEOUT != 1);
BUILD_BUG_ON(SCST_LONG_TIMEOUT != 2);
BUILD_BUG_ON(SCST_BOTH_TIMEOUTS != 3);
cmd->cdb[1] &= 0x1f;
return scst_generic_parse(cmd, cdrom_timeout);
}
EXPORT_SYMBOL_GPL(scst_cdrom_generic_parse);
/*
* scst_modisk_generic_parse() - generic MO parse
*
* Generic parse() for MO disk devices
*/
int scst_modisk_generic_parse(struct scst_cmd *cmd)
{
static const int modisk_timeout[] = {
[0] = SCST_GENERIC_MODISK_REG_TIMEOUT,
[SCST_SMALL_TIMEOUT] = SCST_GENERIC_MODISK_SMALL_TIMEOUT,
[SCST_LONG_TIMEOUT] = SCST_GENERIC_MODISK_LONG_TIMEOUT,
[SCST_BOTH_TIMEOUTS] = SCST_GENERIC_MODISK_LONG_TIMEOUT,
};
BUILD_BUG_ON(SCST_SMALL_TIMEOUT != 1);
BUILD_BUG_ON(SCST_LONG_TIMEOUT != 2);
BUILD_BUG_ON(SCST_BOTH_TIMEOUTS != 3);
cmd->cdb[1] &= 0x1f;
return scst_generic_parse(cmd, modisk_timeout);
}
EXPORT_SYMBOL_GPL(scst_modisk_generic_parse);
/*
* scst_tape_generic_parse() - generic tape parse
*
* Generic parse() for tape devices
*/
int scst_tape_generic_parse(struct scst_cmd *cmd)
{
int res = 0;
TRACE_ENTRY();
/*
* SCST sets good defaults for cmd->data_direction and cmd->bufflen,
* therefore change them only if necessary
*/
if (cmd->op_flags & SCST_TRANSFER_LEN_TYPE_FIXED && cmd->cdb[1] & 1) {
int block_size = cmd->dev->block_size;
uint64_t b, ob;
bool overflow;
b = ((uint64_t)cmd->bufflen) * block_size;
ob = ((uint64_t)cmd->out_bufflen) * block_size;
overflow = (b > 0xFFFFFFFF) ||
(ob > 0xFFFFFFFF);
if (unlikely(overflow)) {
PRINT_WARNING("bufflen %u, data_len %llu or out_bufflen"
" %u too large for device %s (block size"
" %u, b %llu, ob %llu)", cmd->bufflen,
cmd->data_len, cmd->out_bufflen,
cmd->dev->virt_name, block_size, b, ob);
PRINT_BUFFER("CDB", cmd->cdb, cmd->cdb_len);
scst_set_cmd_error(cmd, SCST_LOAD_SENSE(
scst_sense_block_out_range_error));
res = -EINVAL;
goto out;
}
cmd->bufflen = b;
cmd->out_bufflen = ob;
/* cmd->data_len is 64-bit, so can't overflow here */
BUILD_BUG_ON(sizeof(cmd->data_len) < 8);
cmd->data_len *= block_size;
}
if ((cmd->op_flags & (SCST_SMALL_TIMEOUT | SCST_LONG_TIMEOUT)) == 0)
cmd->timeout = SCST_GENERIC_TAPE_REG_TIMEOUT;
else if (cmd->op_flags & SCST_SMALL_TIMEOUT)
cmd->timeout = SCST_GENERIC_TAPE_SMALL_TIMEOUT;
else if (cmd->op_flags & SCST_LONG_TIMEOUT)
cmd->timeout = SCST_GENERIC_TAPE_LONG_TIMEOUT;
out:
TRACE_EXIT_RES(res);
return res;
}
EXPORT_SYMBOL_GPL(scst_tape_generic_parse);
static int scst_null_parse(struct scst_cmd *cmd)
{
int res = 0;
TRACE_ENTRY();
/*
* SCST sets good defaults for cmd->data_direction and cmd->bufflen,
* therefore change them only if necessary
*/
#if 0
switch (cmd->cdb[0]) {
default:
/* It's all good */
break;
}
#endif
TRACE_DBG("res %d bufflen %d direct %d",
res, cmd->bufflen, cmd->data_direction);
TRACE_EXIT();
return res;
}
/*
* scst_changer_generic_parse() - generic changer parse
*
* Generic parse() for changer devices
*/
int scst_changer_generic_parse(struct scst_cmd *cmd)
{
int res = scst_null_parse(cmd);
if (cmd->op_flags & SCST_LONG_TIMEOUT)
cmd->timeout = SCST_GENERIC_CHANGER_LONG_TIMEOUT;
else
cmd->timeout = SCST_GENERIC_CHANGER_TIMEOUT;
return res;
}
EXPORT_SYMBOL_GPL(scst_changer_generic_parse);
/*
* scst_processor_generic_parse - generic SCSI processor parse
*
* Generic parse() for SCSI processor devices
*/
int scst_processor_generic_parse(struct scst_cmd *cmd)
{
int res = scst_null_parse(cmd);
if (cmd->op_flags & SCST_LONG_TIMEOUT)
cmd->timeout = SCST_GENERIC_PROCESSOR_LONG_TIMEOUT;
else
cmd->timeout = SCST_GENERIC_PROCESSOR_TIMEOUT;
return res;
}
EXPORT_SYMBOL_GPL(scst_processor_generic_parse);
/*
* scst_raid_generic_parse() - generic RAID parse
*
* Generic parse() for RAID devices
*/
int scst_raid_generic_parse(struct scst_cmd *cmd)
{
int res = scst_null_parse(cmd);
if (cmd->op_flags & SCST_LONG_TIMEOUT)
cmd->timeout = SCST_GENERIC_RAID_LONG_TIMEOUT;
else
cmd->timeout = SCST_GENERIC_RAID_TIMEOUT;
return res;
}
EXPORT_SYMBOL_GPL(scst_raid_generic_parse);
int scst_do_internal_parsing(struct scst_cmd *cmd)
{
int res, rc;
TRACE_ENTRY();
switch (cmd->dev->type) {
case TYPE_DISK:
rc = scst_sbc_generic_parse(cmd);
break;
case TYPE_TAPE:
rc = scst_tape_generic_parse(cmd);
break;
case TYPE_PROCESSOR:
rc = scst_processor_generic_parse(cmd);
break;
case TYPE_ROM:
rc = scst_cdrom_generic_parse(cmd);
break;
case TYPE_MOD:
rc = scst_modisk_generic_parse(cmd);
break;
case TYPE_MEDIUM_CHANGER:
rc = scst_changer_generic_parse(cmd);
break;
case TYPE_RAID:
rc = scst_raid_generic_parse(cmd);
break;
default:
PRINT_ERROR("Internal parse for type %d not supported",
cmd->dev->type);
goto out_hw_err;
}
if (rc != 0)
goto out_abn;
res = SCST_CMD_STATE_DEFAULT;
out:
TRACE_EXIT();
return res;
out_hw_err:
scst_set_cmd_error(cmd, SCST_LOAD_SENSE(scst_sense_hardw_error));
out_abn:
res = scst_get_cmd_abnormal_done_state(cmd);
goto out;
}
/*
** Generic dev_done() support routines.
** Done via pointer on functions to avoid unneeded dereferences on
** the fast path.
**/
/*
* scst_block_generic_dev_done() - generic SBC dev_done
*
* Generic dev_done() for block (SBC) devices
*/
int scst_block_generic_dev_done(struct scst_cmd *cmd,
void (*set_block_shift)(struct scst_cmd *cmd, int block_shift))
{
int opcode = cmd->cdb[0];
int res = SCST_CMD_STATE_DEFAULT;
int sect_sz_off;
TRACE_ENTRY();
/*
* Potentially, a pass-through backend device can at any time change
* block size behind us, e.g. after FORMAT command, so we need to
* somehow detect it. Intercepting READ CAPACITY is, probably, the
* simplest, yet sufficient way for that.
*/
if (unlikely(opcode == READ_CAPACITY ||
(opcode == SERVICE_ACTION_IN_16 &&
cmd->cdb[1] == SAI_READ_CAPACITY_16))) {
if (scst_cmd_completed_good(cmd)) {
/* Always keep track of disk capacity */
int buffer_size, sector_size, sh;
uint8_t *buffer;
buffer_size = scst_get_buf_full(cmd, &buffer, false);
sect_sz_off = opcode == READ_CAPACITY ? 4 : 8;
if (buffer_size < sect_sz_off + 4) {
scst_put_buf_full(cmd, buffer);
goto out;
}
sector_size = get_unaligned_be32(&buffer[sect_sz_off]);
scst_put_buf_full(cmd, buffer);
if (sector_size != 0) {
sh = scst_calc_block_shift(sector_size);
set_block_shift(cmd, sh);
TRACE_DBG("block_shift %d", sh);
} else {
PRINT_ERROR("Sector size in %s response is 0",
cmd->op_name);
}
}
}
out:
TRACE_EXIT_RES(res);
return res;
}
EXPORT_SYMBOL_GPL(scst_block_generic_dev_done);
/*
* scst_tape_generic_dev_done() - generic tape dev done
*
* Generic dev_done() for tape devices
*/
int scst_tape_generic_dev_done(struct scst_cmd *cmd,
void (*set_block_size)(struct scst_cmd *cmd, int block_shift))
{
int opcode = cmd->cdb[0];
int res = SCST_CMD_STATE_DEFAULT;
int buffer_size, bs;
uint8_t *buffer = NULL;
TRACE_ENTRY();
if (unlikely(!scst_cmd_completed_good(cmd)))
goto out;
switch (opcode) {
case MODE_SENSE:
case MODE_SELECT:
buffer_size = scst_get_buf_full(cmd, &buffer, false);
if (unlikely(buffer_size <= 0)) {
if (buffer_size < 0) {
PRINT_ERROR("%s: Unable to get the buffer (%d)",
__func__, buffer_size);
}
goto out;
}
break;
}
switch (opcode) {
case MODE_SENSE:
TRACE_DBG("%s", "MODE_SENSE");
if ((cmd->cdb[2] & 0xC0) == 0) {
if (buffer[3] == 8) {
bs = get_unaligned_be24(&buffer[9]);
set_block_size(cmd, bs);
}
}
break;
case MODE_SELECT:
TRACE_DBG("%s", "MODE_SELECT");
if (buffer[3] == 8) {
bs = get_unaligned_be24(&buffer[9]);
set_block_size(cmd, bs);
}
break;
default:
/* It's all good */
break;
}
switch (opcode) {
case MODE_SENSE:
case MODE_SELECT:
scst_put_buf_full(cmd, buffer);
break;
}
out:
TRACE_EXIT_RES(res);
return res;
}
EXPORT_SYMBOL_GPL(scst_tape_generic_dev_done);
typedef void (*scst_set_cdb_lba_fn_t)(struct scst_cmd *cmd, int64_t lba);
static void scst_set_cdb_lba1(struct scst_cmd *cmd, int64_t lba)
{
TRACE_ENTRY();
cmd->cdb[cmd->lba_off] = lba;
TRACE_EXIT();
return;
}
static void scst_set_cdb_lba2(struct scst_cmd *cmd, int64_t lba)
{
TRACE_ENTRY();
put_unaligned_be16(lba, &cmd->cdb[cmd->lba_off]);
TRACE_EXIT();
return;
}
static void scst_set_cdb_lba3(struct scst_cmd *cmd, int64_t lba)
{
TRACE_ENTRY();
put_unaligned_be24(lba, &cmd->cdb[cmd->lba_off]);
TRACE_EXIT();
return;
}
static void scst_set_cdb_lba4(struct scst_cmd *cmd, int64_t lba)
{
TRACE_ENTRY();
put_unaligned_be32(lba, &cmd->cdb[cmd->lba_off]);
TRACE_EXIT();
return;
}
static void scst_set_cdb_lba8(struct scst_cmd *cmd, int64_t lba)
{
TRACE_ENTRY();
put_unaligned_be64(lba, &cmd->cdb[cmd->lba_off]);
TRACE_EXIT();
return;
}
static const scst_set_cdb_lba_fn_t scst_set_cdb_lba_fns[9] = {
[1] = scst_set_cdb_lba1,
[2] = scst_set_cdb_lba2,
[3] = scst_set_cdb_lba3,
[4] = scst_set_cdb_lba4,
[8] = scst_set_cdb_lba8,
};
int scst_set_cdb_lba(struct scst_cmd *cmd, int64_t lba)
{
int res;
TRACE_ENTRY();
EXTRACHECKS_BUG_ON(cmd->op_flags & SCST_LBA_NOT_VALID);
scst_set_cdb_lba_fns[cmd->lba_len](cmd, lba);
res = 0;
TRACE_DBG("cmd %p, new LBA %lld", cmd, (unsigned long long)lba);
TRACE_EXIT_RES(res);
return res;
}
EXPORT_SYMBOL_GPL(scst_set_cdb_lba);
typedef void (*scst_set_cdb_transf_len_fn_t)(struct scst_cmd *cmd, int len);
static void scst_set_cdb_transf_len1(struct scst_cmd *cmd, int len)
{
TRACE_ENTRY();
cmd->cdb[cmd->len_off] = len;
TRACE_EXIT();
return;
}
static void scst_set_cdb_transf_len2(struct scst_cmd *cmd, int len)
{
TRACE_ENTRY();
put_unaligned_be16(len, &cmd->cdb[cmd->len_off]);
TRACE_EXIT();
return;
}
static void scst_set_cdb_transf_len3(struct scst_cmd *cmd, int len)
{
TRACE_ENTRY();
put_unaligned_be24(len, &cmd->cdb[cmd->len_off]);
TRACE_EXIT();
return;
}
static void scst_set_cdb_transf_len4(struct scst_cmd *cmd, int len)
{
TRACE_ENTRY();
put_unaligned_be32(len, &cmd->cdb[cmd->len_off]);
TRACE_EXIT();
return;
}
static void scst_set_cdb_transf_len8(struct scst_cmd *cmd, int len)
{
TRACE_ENTRY();
put_unaligned_be64(len, &cmd->cdb[cmd->len_off]);
TRACE_EXIT();
return;
}
static const scst_set_cdb_transf_len_fn_t scst_set_cdb_transf_len_fns[9] = {
[1] = scst_set_cdb_transf_len1,
[2] = scst_set_cdb_transf_len2,
[3] = scst_set_cdb_transf_len3,
[4] = scst_set_cdb_transf_len4,
[8] = scst_set_cdb_transf_len8,
};
int scst_set_cdb_transf_len(struct scst_cmd *cmd, int len)
{
int res;
TRACE_ENTRY();
scst_set_cdb_transf_len_fns[cmd->len_len](cmd, len);
res = 0;
TRACE_DBG("cmd %p, new len %d", cmd, len);
TRACE_EXIT_RES(res);
return res;
}
EXPORT_SYMBOL_GPL(scst_set_cdb_transf_len);
static void scst_check_internal_sense(struct scst_device *dev, int result,
uint8_t *sense, int sense_len)
{
TRACE_ENTRY();
if (host_byte(result) == DID_RESET) {
int sl;
TRACE(TRACE_MGMT, "DID_RESET received for device %s, "
"triggering reset UA", dev->virt_name);
sl = scst_set_sense(sense, sense_len, dev->d_sense,
SCST_LOAD_SENSE(scst_sense_reset_UA));
scst_dev_check_set_UA(dev, NULL, sense, sl);
} else if ((status_byte(result) == CHECK_CONDITION) &&
scst_is_ua_sense(sense, sense_len))
scst_dev_check_set_UA(dev, NULL, sense, sense_len);
TRACE_EXIT();
return;
}
/*
* scst_to_dma_dir() - translate SCST's data direction to DMA direction
*
* Translates SCST's data direction to DMA one from backend storage
* perspective.
*/
enum dma_data_direction scst_to_dma_dir(int scst_dir)
{
static const enum dma_data_direction tr_tbl[] = { DMA_NONE,
DMA_TO_DEVICE, DMA_FROM_DEVICE, DMA_BIDIRECTIONAL, DMA_NONE };
return tr_tbl[scst_dir];
}
EXPORT_SYMBOL(scst_to_dma_dir);
/*
* scst_to_tgt_dma_dir() - translate SCST data direction to DMA direction
*
* Translates SCST data direction to DMA data direction from the perspective
* of a target.
*/
enum dma_data_direction scst_to_tgt_dma_dir(int scst_dir)
{
static const enum dma_data_direction tr_tbl[] = { DMA_NONE,
DMA_FROM_DEVICE, DMA_TO_DEVICE, DMA_BIDIRECTIONAL, DMA_NONE };
return tr_tbl[scst_dir];
}
EXPORT_SYMBOL(scst_to_tgt_dma_dir);
/*
* Called under dev_lock and BH off.
*
* !! scst_unblock_aborted_cmds() must be called after this function !!
*/
void scst_process_reset(struct scst_device *dev,
struct scst_session *originator, struct scst_cmd *exclude_cmd,
struct scst_mgmt_cmd *mcmd, bool setUA)
{
struct scst_tgt_dev *tgt_dev;
struct scst_cmd *cmd;
TRACE_ENTRY();
/* Clear RESERVE'ation, if necessary */
scst_clear_dev_reservation(dev);
/*
* There is no need to send RELEASE, since the device is going
* to be reset. Actually, since we can be in RESET TM
* function, it might be dangerous.
*/
dev->dev_double_ua_possible = 1;
list_for_each_entry(tgt_dev, &dev->dev_tgt_dev_list,
dev_tgt_dev_list_entry) {
struct scst_session *sess = tgt_dev->sess;
#if 0 /* Clearing UAs and last sense isn't required by SAM and it
* looks to be better to not clear them to not loose important
* events, so let's disable it.
*/
spin_lock_bh(&tgt_dev->tgt_dev_lock);
scst_free_all_UA(tgt_dev);
memset(tgt_dev->tgt_dev_sense, 0,
sizeof(tgt_dev->tgt_dev_sense));
spin_unlock_bh(&tgt_dev->tgt_dev_lock);
#endif
spin_lock_irq(&sess->sess_list_lock);
TRACE_DBG("Searching in sess cmd list (sess=%p)", sess);
list_for_each_entry(cmd, &sess->sess_cmd_list,
sess_cmd_list_entry) {
if (cmd == exclude_cmd)
continue;
if ((cmd->tgt_dev == tgt_dev) ||
((cmd->tgt_dev == NULL) &&
(cmd->lun == tgt_dev->lun))) {
scst_abort_cmd(cmd, mcmd,
(tgt_dev->sess != originator), 0);
}
}
spin_unlock_irq(&sess->sess_list_lock);
}
/*
* We need at first abort all affected commands and only then
* release them as part of clearing ACA
*/
list_for_each_entry(tgt_dev, &dev->dev_tgt_dev_list,
dev_tgt_dev_list_entry) {
scst_clear_aca(tgt_dev, (tgt_dev->sess != originator));
}
if (setUA) {
uint8_t sense_buffer[SCST_STANDARD_SENSE_LEN];
int sl = scst_set_sense(sense_buffer, sizeof(sense_buffer),
dev->d_sense, SCST_LOAD_SENSE(scst_sense_reset_UA));
/*
* Potentially, setting UA here, when the aborted commands are
* still running, can lead to a situation that one of them could
* take it, then that would be detected and the UA requeued.
* But, meanwhile, one or more subsequent, i.e. not aborted,
* commands can "leak" executed normally. So, as result, the
* UA would be delivered one or more commands "later". However,
* that should be OK, because, if multiple commands are being
* executed in parallel, you can't control exact order of UA
* delivery anyway.
*/
scst_dev_check_set_local_UA(dev, exclude_cmd, sense_buffer, sl);
}
TRACE_EXIT();
return;
}
/* Caller must hold tgt_dev->tgt_dev_lock. */
void scst_tgt_dev_del_free_UA(struct scst_tgt_dev *tgt_dev,
struct scst_tgt_dev_UA *ua)
{
list_del(&ua->UA_list_entry);
if (list_empty(&tgt_dev->UA_list))
clear_bit(SCST_TGT_DEV_UA_PENDING, &tgt_dev->tgt_dev_flags);
mempool_free(ua, scst_ua_mempool);
}
/* No locks, no IRQ or IRQ-disabled context allowed */
int scst_set_pending_UA(struct scst_cmd *cmd, uint8_t *buf, int *size)
{
int res = 0, i;
struct scst_tgt_dev_UA *UA_entry;
bool first = true, global_unlock = false;
struct scst_session *sess = cmd->sess;
TRACE_ENTRY();
/*
* RMB and recheck to sync with setting SCST_CMD_ABORTED in
* scst_abort_cmd() to not set UA for the being aborted cmd, hence
* possibly miss its delivery by a legitimate command while the UA is
* being requeued.
*/
smp_rmb();
if (test_bit(SCST_CMD_ABORTED, &cmd->cmd_flags)) {
TRACE_MGMT_DBG("Not set pending UA for aborted cmd %p", cmd);
res = -1;
goto out;
}
spin_lock_bh(&cmd->tgt_dev->tgt_dev_lock);
again:
/* UA list could be cleared behind us, so retest */
if (list_empty(&cmd->tgt_dev->UA_list)) {
TRACE_DBG("SCST_TGT_DEV_UA_PENDING set, but UA_list empty");
res = -1;
goto out_unlock;
} else
TRACE_MGMT_DBG("Setting pending UA cmd %p (tgt_dev %p, dev %s, "
"initiator %s)", cmd, cmd->tgt_dev, cmd->dev->virt_name,
cmd->sess->initiator_name);
UA_entry = list_first_entry(&cmd->tgt_dev->UA_list, typeof(*UA_entry),
UA_list_entry);
TRACE_DBG("Setting pending UA %p to cmd %p", UA_entry, cmd);
if (UA_entry->global_UA && first) {
TRACE_MGMT_DBG("Global UA %p detected", UA_entry);
#if !defined(__CHECKER__)
spin_unlock_bh(&cmd->tgt_dev->tgt_dev_lock);
local_bh_disable();
rcu_read_lock();
for (i = 0; i < SESS_TGT_DEV_LIST_HASH_SIZE; i++) {
struct list_head *head = &sess->sess_tgt_dev_list[i];
struct scst_tgt_dev *tgt_dev;
list_for_each_entry_rcu(tgt_dev, head,
sess_tgt_dev_list_entry) {
/*
* Lockdep reports a false positive here before
* kernel version v5.1.
*/
spin_lock(&tgt_dev->tgt_dev_lock);
}
}
#endif
first = false;
global_unlock = true;
goto again;
}
if (buf == NULL) {
if (scst_set_cmd_error_sense(cmd, UA_entry->UA_sense_buffer,
UA_entry->UA_valid_sense_len) != 0)
goto out_unlock;
} else {
sBUG_ON(*size == 0);
if (UA_entry->UA_valid_sense_len > *size) {
TRACE(TRACE_MINOR, "%s: Being returned UA truncated "
"to size %d (needed %d)", cmd->op_name,
*size, UA_entry->UA_valid_sense_len);
*size = UA_entry->UA_valid_sense_len;
}
TRACE_DBG("Returning UA in buffer %p (size %d)", buf, *size);
memcpy(buf, UA_entry->UA_sense_buffer, *size);
*size = UA_entry->UA_valid_sense_len;
}
cmd->ua_ignore = 1;
list_del(&UA_entry->UA_list_entry);
if (UA_entry->global_UA) {
for (i = 0; i < SESS_TGT_DEV_LIST_HASH_SIZE; i++) {
struct list_head *head = &sess->sess_tgt_dev_list[i];
struct scst_tgt_dev *tgt_dev;
list_for_each_entry_rcu(tgt_dev, head,
sess_tgt_dev_list_entry) {
struct scst_tgt_dev_UA *ua;
list_for_each_entry(ua, &tgt_dev->UA_list,
UA_list_entry) {
if (ua->global_UA &&
memcmp(ua->UA_sense_buffer,
UA_entry->UA_sense_buffer,
sizeof(ua->UA_sense_buffer)) == 0) {
TRACE_MGMT_DBG("Freeing not "
"needed global UA %p",
ua);
scst_tgt_dev_del_free_UA(tgt_dev,
ua);
break;
}
}
}
}
}
mempool_free(UA_entry, scst_ua_mempool);
if (list_empty(&cmd->tgt_dev->UA_list)) {
clear_bit(SCST_TGT_DEV_UA_PENDING,
&cmd->tgt_dev->tgt_dev_flags);
}
out_unlock:
if (global_unlock) {
#if !defined(__CHECKER__)
for (i = SESS_TGT_DEV_LIST_HASH_SIZE-1; i >= 0; i--) {
struct list_head *head = &sess->sess_tgt_dev_list[i];
struct scst_tgt_dev *tgt_dev;
list_for_each_entry_rcu(tgt_dev, head,
sess_tgt_dev_list_entry) {
spin_unlock(&tgt_dev->tgt_dev_lock);
}
}
rcu_read_unlock();
local_bh_enable();
spin_lock_bh(&cmd->tgt_dev->tgt_dev_lock);
#endif
}
spin_unlock_bh(&cmd->tgt_dev->tgt_dev_lock);
out:
TRACE_EXIT_RES(res);
return res;
}
/*
* Called under tgt_dev_lock and BH off, except when guaranteed that
* there's only one user of tgt_dev.
*/
static void scst_alloc_set_UA(struct scst_tgt_dev *tgt_dev,
const uint8_t *sense, int sense_len, int flags)
{
struct scst_tgt_dev_UA *UA_entry = NULL;
TRACE_ENTRY();
UA_entry = mempool_alloc(scst_ua_mempool, GFP_ATOMIC);
if (UA_entry == NULL) {
PRINT_CRIT_ERROR("%s", "UNIT ATTENTION memory "
"allocation failed. The UNIT ATTENTION "
"on some sessions will be missed");
PRINT_BUFFER("Lost UA", sense, sense_len);
goto out;
}
memset(UA_entry, 0, sizeof(*UA_entry));
UA_entry->global_UA = (flags & SCST_SET_UA_FLAG_GLOBAL) != 0;
TRACE(TRACE_MGMT_DEBUG|TRACE_SCSI, "Queuing new %sUA %p (%x:%x:%x, "
"d_sense %d) to tgt_dev %p (dev %s, initiator %s)",
UA_entry->global_UA ? "global " : "", UA_entry, sense[2],
sense[12], sense[13], tgt_dev->dev->d_sense, tgt_dev,
tgt_dev->dev->virt_name, tgt_dev->sess->initiator_name);
TRACE_BUFF_FLAG(TRACE_DEBUG, "UA sense", sense, sense_len);
if (sense_len > (int)sizeof(UA_entry->UA_sense_buffer)) {
PRINT_WARNING("Sense truncated (needed %d), shall you increase "
"SCST_SENSE_BUFFERSIZE?", sense_len);
sense_len = sizeof(UA_entry->UA_sense_buffer);
}
memcpy(UA_entry->UA_sense_buffer, sense, sense_len);
UA_entry->UA_valid_sense_len = sense_len;
set_bit(SCST_TGT_DEV_UA_PENDING, &tgt_dev->tgt_dev_flags);
if (flags & SCST_SET_UA_FLAG_AT_HEAD)
list_add(&UA_entry->UA_list_entry, &tgt_dev->UA_list);
else
list_add_tail(&UA_entry->UA_list_entry, &tgt_dev->UA_list);
out:
TRACE_EXIT();
return;
}
/* tgt_dev_lock supposed to be held and BH off */
static void __scst_check_set_UA(struct scst_tgt_dev *tgt_dev,
const uint8_t *sense, int sense_len, int flags)
{
int skip_UA = 0;
struct scst_tgt_dev_UA *UA_entry_tmp;
int len = min_t(int, sizeof(UA_entry_tmp->UA_sense_buffer), sense_len);
TRACE_ENTRY();
lockdep_assert_held(&tgt_dev->tgt_dev_lock);
list_for_each_entry(UA_entry_tmp, &tgt_dev->UA_list,
UA_list_entry) {
if (memcmp(sense, UA_entry_tmp->UA_sense_buffer, len) == 0) {
TRACE_DBG("UA already exists (dev %s, "
"initiator %s)", tgt_dev->dev->virt_name,
tgt_dev->sess->initiator_name);
skip_UA = 1;
break;
}
}
if (skip_UA == 0)
scst_alloc_set_UA(tgt_dev, sense, len, flags);
TRACE_EXIT();
return;
}
void scst_check_set_UA(struct scst_tgt_dev *tgt_dev,
const uint8_t *sense, int sense_len, int flags)
{
TRACE_ENTRY();
spin_lock_bh(&tgt_dev->tgt_dev_lock);
__scst_check_set_UA(tgt_dev, sense, sense_len, flags);
spin_unlock_bh(&tgt_dev->tgt_dev_lock);
TRACE_EXIT();
return;
}
/* Called under dev_lock and BH off */
void scst_dev_check_set_local_UA(struct scst_device *dev,
struct scst_cmd *exclude, const uint8_t *sense, int sense_len)
{
struct scst_tgt_dev *tgt_dev, *exclude_tgt_dev = NULL;
TRACE_ENTRY();
if (exclude != NULL)
exclude_tgt_dev = exclude->tgt_dev;
list_for_each_entry(tgt_dev, &dev->dev_tgt_dev_list,
dev_tgt_dev_list_entry) {
if (tgt_dev != exclude_tgt_dev)
scst_check_set_UA(tgt_dev, sense, sense_len, 0);
}
TRACE_EXIT();
return;
}
/*
* Called under dev_lock and BH off. Returns true if scst_unblock_aborted_cmds()
* should be called outside of the dev_lock.
*/
static bool __scst_dev_check_set_UA(struct scst_device *dev,
struct scst_cmd *exclude, const uint8_t *sense, int sense_len)
{
bool res = false;
TRACE_ENTRY();
TRACE_MGMT_DBG("Processing UA dev %s", dev->virt_name);
/* Check for reset UA */
if (scst_analyze_sense(sense, sense_len, SCST_SENSE_ASC_VALID,
0, SCST_SENSE_ASC_UA_RESET, 0)) {
scst_process_reset(dev,
(exclude != NULL) ? exclude->sess : NULL,
exclude, NULL, false);
res = true;
}
scst_dev_check_set_local_UA(dev, exclude, sense, sense_len);
TRACE_EXIT_RES(res);
return res;
}
void scst_dev_check_set_UA(struct scst_device *dev,
struct scst_cmd *exclude, const uint8_t *sense, int sense_len)
{
struct scst_lksb lksb;
bool rc;
scst_res_lock(dev, &lksb);
rc = __scst_dev_check_set_UA(dev, exclude, sense, sense_len);
scst_res_unlock(dev, &lksb);
if (rc)
scst_unblock_aborted_cmds(NULL, NULL, dev);
return;
}
void scst_set_tp_soft_threshold_reached_UA(struct scst_tgt_dev *tgt_dev)
{
uint8_t sense[SCST_STANDARD_SENSE_LEN];
int len;
TRACE_ENTRY();
len = scst_set_sense(sense, sizeof(sense), tgt_dev->dev->d_sense,
SCST_LOAD_SENSE(scst_sense_tp_soft_threshold_reached));
scst_check_set_UA(tgt_dev, sense, len, 0);
TRACE_EXIT();
return;
}
EXPORT_SYMBOL_GPL(scst_set_tp_soft_threshold_reached_UA);
/* Called under tgt_dev_lock or when tgt_dev is unused */
static void scst_free_all_UA(struct scst_tgt_dev *tgt_dev)
{
struct scst_tgt_dev_UA *UA_entry, *t;
TRACE_ENTRY();
list_for_each_entry_safe(UA_entry, t,
&tgt_dev->UA_list, UA_list_entry) {
TRACE_MGMT_DBG("Clearing UA for tgt_dev LUN %lld",
(unsigned long long)tgt_dev->lun);
list_del(&UA_entry->UA_list_entry);
mempool_free(UA_entry, scst_ua_mempool);
}
INIT_LIST_HEAD(&tgt_dev->UA_list);
clear_bit(SCST_TGT_DEV_UA_PENDING, &tgt_dev->tgt_dev_flags);
TRACE_EXIT();
return;
}
/*
* sn_lock supposed to be locked and IRQs off. Might drop then reacquire
* it inside.
*/
struct scst_cmd *__scst_check_deferred_commands_locked(
struct scst_order_data *order_data, bool return_first)
__releases(&order_data->sn_lock)
__acquires(&order_data->sn_lock)
{
struct scst_cmd *res = NULL, *cmd, *t;
typeof(order_data->expected_sn) expected_sn = order_data->expected_sn;
bool activate = !return_first, first = true, found = false;
TRACE_ENTRY();
if (unlikely(order_data->hq_cmd_count != 0))
goto out;
restart:
list_for_each_entry_safe(cmd, t, &order_data->deferred_cmd_list,
deferred_cmd_list_entry) {
EXTRACHECKS_BUG_ON(cmd->queue_type == SCST_CMD_QUEUE_ACA);
if (unlikely(order_data->aca_tgt_dev != 0)) {
if (!test_bit(SCST_CMD_ABORTED, &cmd->cmd_flags)) {
/* To prevent defer/release storms during ACA */
continue;
}
}
if (unlikely(cmd->done)) {
TRACE_MGMT_DBG("Releasing deferred done cmd %p", cmd);
order_data->def_cmd_count--;
list_del(&cmd->deferred_cmd_list_entry);
spin_lock(&cmd->cmd_threads->cmd_list_lock);
TRACE_DBG("Adding cmd %p to active cmd list", cmd);
list_add_tail(&cmd->cmd_list_entry,
&cmd->cmd_threads->active_cmd_list);
wake_up(&cmd->cmd_threads->cmd_list_waitQ);
spin_unlock(&cmd->cmd_threads->cmd_list_lock);
} else if ((cmd->sn == expected_sn) || !cmd->sn_set) {
bool stop = (cmd->sn_slot == NULL);
TRACE_SN("Deferred command %p (sn %d, set %d) found",
cmd, cmd->sn, cmd->sn_set);
order_data->def_cmd_count--;
list_del(&cmd->deferred_cmd_list_entry);
if (activate) {
spin_lock(&cmd->cmd_threads->cmd_list_lock);
TRACE_SN("Adding cmd %p to active cmd list", cmd);
list_add_tail(&cmd->cmd_list_entry,
&cmd->cmd_threads->active_cmd_list);
wake_up(&cmd->cmd_threads->cmd_list_waitQ);
spin_unlock(&cmd->cmd_threads->cmd_list_lock);
/* !! At this point cmd can be already dead !! */
}
if (first) {
if (!activate)
res = cmd;
if (stop) {
/*
* Then there can be only one command
* with this SN, so there's no point
* to iterate further.
*/
goto out;
}
first = false;
activate = true;
}
found = true;
}
}
if (found)
goto out;
list_for_each_entry(cmd, &order_data->skipped_sn_list,
deferred_cmd_list_entry) {
EXTRACHECKS_BUG_ON(cmd->queue_type == SCST_CMD_QUEUE_HEAD_OF_QUEUE);
if (cmd->sn == expected_sn) {
/*
* !! At this point any pointer in cmd, except !!
* !! cur_order_data, sn_slot and !!
* !! deferred_cmd_list_entry, could be already !!
* !! destroyed! !!
*/
TRACE_SN("cmd %p (tag %llu) with skipped sn %d found",
cmd, (unsigned long long)cmd->tag, cmd->sn);
order_data->def_cmd_count--;
list_del(&cmd->deferred_cmd_list_entry);
spin_unlock_irq(&order_data->sn_lock);
scst_inc_expected_sn(cmd);
if (test_and_set_bit(SCST_CMD_CAN_BE_DESTROYED,
&cmd->cmd_flags))
scst_destroy_cmd(cmd);
expected_sn = order_data->expected_sn;
spin_lock_irq(&order_data->sn_lock);
goto restart;
}
}
out:
TRACE_EXIT_HRES((unsigned long)res);
return res;
}
/* No locks */
struct scst_cmd *__scst_check_deferred_commands(
struct scst_order_data *order_data, bool return_first)
{
struct scst_cmd *res;
TRACE_ENTRY();
spin_lock_irq(&order_data->sn_lock);
res = __scst_check_deferred_commands_locked(order_data, return_first);
spin_unlock_irq(&order_data->sn_lock);
TRACE_EXIT_HRES((unsigned long)res);
return res;
}
void scst_unblock_deferred(struct scst_order_data *order_data,
struct scst_cmd *out_of_sn_cmd)
{
TRACE_ENTRY();
if (!out_of_sn_cmd->sn_set) {
TRACE_SN("cmd %p without sn", out_of_sn_cmd);
goto out;
}
if (out_of_sn_cmd->sn == order_data->expected_sn) {
TRACE_SN("out of sn cmd %p (expected sn %d)",
out_of_sn_cmd, order_data->expected_sn);
scst_inc_expected_sn(out_of_sn_cmd);
} else {
out_of_sn_cmd->out_of_sn = 1;
spin_lock_irq(&order_data->sn_lock);
order_data->def_cmd_count++;
list_add_tail(&out_of_sn_cmd->deferred_cmd_list_entry,
&order_data->skipped_sn_list);
TRACE_SN("out_of_sn_cmd %p with sn %d added to skipped_sn_list"
" (expected_sn %d)", out_of_sn_cmd, out_of_sn_cmd->sn,
order_data->expected_sn);
spin_unlock_irq(&order_data->sn_lock);
/*
* expected_sn could change while we there, so we need to
* recheck deferred commands on this path as well
*/
}
scst_make_deferred_commands_active(order_data);
out:
TRACE_EXIT();
return;
}
/* dev_lock supposed to be held and BH disabled */
void scst_block_dev(struct scst_device *dev)
{
dev->block_count++;
TRACE_BLOCK("Device BLOCK (new count %d), dev %s", dev->block_count,
dev->virt_name);
}
/*
* dev_lock supposed to be held and BH disabled. Returns true if cmd blocked,
* hence stop processing it and go to the next command.
*/
bool __scst_check_blocked_dev(struct scst_cmd *cmd)
{
int res = false;
struct scst_device *dev = cmd->dev;
TRACE_ENTRY();
EXTRACHECKS_BUG_ON(cmd->unblock_dev);
EXTRACHECKS_BUG_ON(cmd->internal && cmd->cdb[0] != EXTENDED_COPY);
if (unlikely(test_bit(SCST_CMD_ABORTED, &cmd->cmd_flags)))
goto out;
if (dev->block_count > 0) {
TRACE_BLOCK("Delaying cmd %p due to blocking "
"(tag %llu, op %s, dev %s)", cmd,
(unsigned long long)cmd->tag,
scst_get_opcode_name(cmd), dev->virt_name);
goto out_block;
} else if ((cmd->op_flags & SCST_STRICTLY_SERIALIZED) == SCST_STRICTLY_SERIALIZED) {
TRACE_BLOCK("Strictly serialized cmd %p (tag %llu, op %s, dev %s)",
cmd, (unsigned long long)cmd->tag,
scst_get_opcode_name(cmd), dev->virt_name);
if ((cmd->cdb[0] == MAINTENANCE_OUT) &&
((cmd->cdb[1] & 0x1f) == MO_SET_TARGET_PGS)) {
const struct scst_cmd *c;
/*
* It's OK to do that without lock, because we
* are interested only in comparison
*/
c = list_first_entry(&scst_global_stpg_list, typeof(*c),
global_stpg_list_entry);
if (cmd != c) {
TRACE_BLOCK("Blocking serialized STPG cmd %p "
"(head %p)", cmd, c);
cmd->cmd_global_stpg_blocked = 1;
goto out_block;
}
}
scst_block_dev(dev);
if (dev->on_dev_cmd_count > 1) {
TRACE_BLOCK("Delaying strictly serialized cmd %p "
"(dev %s, on_dev_cmds to wait %d)", cmd,
dev->virt_name, dev->on_dev_cmd_count-1);
EXTRACHECKS_BUG_ON(dev->strictly_serialized_cmd_waiting);
dev->strictly_serialized_cmd_waiting = 1;
goto out_block;
} else
cmd->unblock_dev = 1;
} else if ((dev->dev_double_ua_possible) ||
((cmd->op_flags & SCST_SERIALIZED) != 0)) {
TRACE_BLOCK("cmd %p (tag %llu, op %s): blocking further cmds "
"on dev %s due to %s", cmd, (unsigned long long)cmd->tag,
scst_get_opcode_name(cmd), dev->virt_name,
dev->dev_double_ua_possible ? "possible double reset UA" :
"serialized cmd");
scst_block_dev(dev);
cmd->unblock_dev = 1;
} else
TRACE_BLOCK("No blocks for device %s", dev->virt_name);
out:
TRACE_EXIT_RES(res);
return res;
out_block:
if (cmd->queue_type == SCST_CMD_QUEUE_HEAD_OF_QUEUE)
list_add(&cmd->blocked_cmd_list_entry,
&dev->blocked_cmd_list);
else
list_add_tail(&cmd->blocked_cmd_list_entry,
&dev->blocked_cmd_list);
res = true;
goto out;
}
/* dev_lock supposed to be held and BH disabled */
void scst_unblock_dev(struct scst_device *dev)
{
TRACE_ENTRY();
TRACE_BLOCK("Device UNBLOCK (new %d), dev %s",
dev->block_count-1, dev->virt_name);
if (--dev->block_count == 0) {
struct scst_cmd *cmd, *tcmd;
unsigned long flags;
local_irq_save_nort(flags);
list_for_each_entry_safe(cmd, tcmd, &dev->blocked_cmd_list,
blocked_cmd_list_entry) {
bool strictly_serialized =
((cmd->op_flags & SCST_STRICTLY_SERIALIZED) == SCST_STRICTLY_SERIALIZED);
if (dev->strictly_serialized_cmd_waiting &&
!strictly_serialized)
continue;
list_del(&cmd->blocked_cmd_list_entry);
cmd->cmd_global_stpg_blocked = 0;
TRACE_BLOCK("Adding blocked cmd %p to active cmd list", cmd);
spin_lock(&cmd->cmd_threads->cmd_list_lock);
if (cmd->queue_type == SCST_CMD_QUEUE_HEAD_OF_QUEUE)
list_add(&cmd->cmd_list_entry,
&cmd->cmd_threads->active_cmd_list);
else
list_add_tail(&cmd->cmd_list_entry,
&cmd->cmd_threads->active_cmd_list);
wake_up(&cmd->cmd_threads->cmd_list_waitQ);
spin_unlock(&cmd->cmd_threads->cmd_list_lock);
if (dev->strictly_serialized_cmd_waiting && strictly_serialized)
break;
}
local_irq_restore_nort(flags);
}
sBUG_ON(dev->block_count < 0);
TRACE_EXIT();
return;
}
/**
* scst_obtain_device_parameters() - obtain device control parameters
* @dev: device to act on
* @mode_select_cdb: original MODE SELECT CDB
*
* Issues a MODE SENSE for necessary pages data and sets the corresponding
* dev's parameter from it. Parameter mode_select_cdb is pointer on original
* MODE SELECT CDB, if this function called to refresh parameters after
* successfully finished MODE SELECT command detected.
*
* Returns 0 on success and not 0 otherwise.
*/
int scst_obtain_device_parameters(struct scst_device *dev,
const uint8_t *mode_select_cdb)
{
int rc, i;
uint8_t cmd[16];
uint8_t buffer[4+0x0A];
uint8_t sense_buffer[SCSI_SENSE_BUFFERSIZE];
TRACE_ENTRY();
EXTRACHECKS_BUG_ON(dev->scsi_dev == NULL);
if (mode_select_cdb != NULL) {
if ((mode_select_cdb[2] & 0x3F) != 0x0A) {
TRACE_DBG("Not control mode page (%x) change requested, "
"skipping", mode_select_cdb[2] & 0x3F);
goto out;
}
}
for (i = 0; i < 5; i++) {
/* Get control mode page */
memset(cmd, 0, sizeof(cmd));
#if 0
cmd[0] = MODE_SENSE_10;
cmd[1] = 0;
cmd[2] = 0x0A;
cmd[8] = sizeof(buffer); /* it's < 256 */
#else
cmd[0] = MODE_SENSE;
cmd[1] = 8; /* DBD */
cmd[2] = 0x0A;
cmd[4] = sizeof(buffer);
#endif
memset(buffer, 0, sizeof(buffer));
memset(sense_buffer, 0, sizeof(sense_buffer));
TRACE(TRACE_SCSI, "%s", "Doing internal MODE_SENSE");
rc = scst_scsi_execute(dev->scsi_dev, cmd, SCST_DATA_READ,
buffer, sizeof(buffer), sense_buffer,
15, 0, 0);
TRACE_DBG("MODE_SENSE done: %x", rc);
if (scsi_status_is_good(rc)) {
int q;
PRINT_BUFF_FLAG(TRACE_SCSI, "Returned control mode "
"page data", buffer, sizeof(buffer));
dev->tst = buffer[4+2] >> 5;
dev->tmf_only = (buffer[4+2] & 0x10) >> 4;
dev->dpicz = (buffer[4+2] & 0x8) >> 3;
q = buffer[4+3] >> 4;
if (q > SCST_QUEUE_ALG_1_UNRESTRICTED_REORDER) {
PRINT_ERROR("Too big QUEUE ALG %x, dev %s, "
"using default: unrestricted reorder",
dev->queue_alg, dev->virt_name);
q = SCST_QUEUE_ALG_1_UNRESTRICTED_REORDER;
}
dev->queue_alg = q;
dev->qerr = (buffer[4+3] & 0x6) >> 1;
dev->swp = (buffer[4+4] & 0x8) >> 3;
dev->tas = (buffer[4+5] & 0x40) >> 6;
dev->d_sense = (buffer[4+2] & 0x4) >> 2;
/*
* Unfortunately, SCSI ML doesn't provide a way to
* specify commands task attribute, so we can rely on
* device's restricted reordering only. Linux I/O
* subsystem doesn't reorder pass-through (PC) requests.
*/
dev->has_own_order_mgmt = !dev->queue_alg;
PRINT_INFO("Device %s: TST %x, TMF_ONLY %x, QUEUE ALG %x, "
"QErr %x, SWP %x, TAS %x, D_SENSE %d, DPICZ %d, "
"has_own_order_mgmt %d", dev->virt_name,
dev->tst, dev->tmf_only, dev->queue_alg,
dev->qerr, dev->swp, dev->tas, dev->d_sense,
dev->dpicz, dev->has_own_order_mgmt);
goto out;
} else {
scst_check_internal_sense(dev, rc, sense_buffer,
sizeof(sense_buffer));
#if 0
if ((status_byte(rc) == CHECK_CONDITION) &&
scst_sense_valid(sense_buffer)) {
#else
/*
* 3ware controller is buggy and returns CONDITION_GOOD
* instead of CHECK_CONDITION
*/
if (scst_sense_valid(sense_buffer)) {
#endif
PRINT_BUFF_FLAG(TRACE_SCSI, "MODE SENSE returned "
"sense", sense_buffer, sizeof(sense_buffer));
if (scst_analyze_sense(sense_buffer,
sizeof(sense_buffer),
SCST_SENSE_KEY_VALID,
ILLEGAL_REQUEST, 0, 0)) {
PRINT_INFO("Device %s doesn't support "
"MODE SENSE or control mode page",
dev->virt_name);
break;
} else if (scst_analyze_sense(sense_buffer,
sizeof(sense_buffer),
SCST_SENSE_KEY_VALID,
NOT_READY, 0, 0)) {
PRINT_ERROR("Device %s not ready",
dev->virt_name);
break;
}
} else {
PRINT_INFO("Internal MODE SENSE to "
"device %s failed: %x",
dev->virt_name, rc);
switch (host_byte(rc)) {
case DID_RESET:
case DID_ABORT:
case DID_SOFT_ERROR:
break;
default:
goto brk;
}
switch (driver_byte(rc)) {
case DRIVER_BUSY:
case DRIVER_SOFT:
break;
default:
goto brk;
}
}
}
}
brk:
PRINT_WARNING("Unable to get device's %s control mode page, using "
"existing values/defaults: TST %x, TMF_ONLY %x, QUEUE ALG %x, "
"QErr %x, SWP %x, TAS %x, D_SENSE %d, DPICZ %d, "
"has_own_order_mgmt %d", dev->virt_name, dev->tst,
dev->tmf_only, dev->queue_alg, dev->qerr, dev->swp, dev->tas,
dev->d_sense, dev->dpicz, dev->has_own_order_mgmt);
out:
TRACE_EXIT();
return 0;
}
EXPORT_SYMBOL_GPL(scst_obtain_device_parameters);
void scst_on_hq_cmd_response(struct scst_cmd *cmd)
{
struct scst_order_data *order_data = cmd->cur_order_data;
TRACE_ENTRY();
if (!cmd->hq_cmd_inced)
goto out;
spin_lock_irq(&order_data->sn_lock);
order_data->hq_cmd_count--;
spin_unlock_irq(&order_data->sn_lock);
EXTRACHECKS_BUG_ON(order_data->hq_cmd_count < 0);
/*
* There is no problem in checking hq_cmd_count in the
* non-locked state. In the worst case we will only have
* unneeded run of the deferred commands.
*/
if (order_data->hq_cmd_count == 0)
scst_make_deferred_commands_active(order_data);
out:
TRACE_EXIT();
return;
}
void scst_store_sense(struct scst_cmd *cmd)
{
TRACE_ENTRY();
if (scst_sense_valid(cmd->sense) &&
!test_bit(SCST_CMD_NO_RESP, &cmd->cmd_flags) &&
(cmd->tgt_dev != NULL)) {
struct scst_tgt_dev *tgt_dev = cmd->tgt_dev;
TRACE_DBG("Storing sense (cmd %p)", cmd);
spin_lock_bh(&tgt_dev->tgt_dev_lock);
if (cmd->sense_valid_len <= sizeof(tgt_dev->tgt_dev_sense))
tgt_dev->tgt_dev_valid_sense_len = cmd->sense_valid_len;
else {
tgt_dev->tgt_dev_valid_sense_len = sizeof(tgt_dev->tgt_dev_sense);
PRINT_ERROR("Stored sense truncated to size %d "
"(needed %d)", tgt_dev->tgt_dev_valid_sense_len,
cmd->sense_valid_len);
}
memcpy(tgt_dev->tgt_dev_sense, cmd->sense,
tgt_dev->tgt_dev_valid_sense_len);
spin_unlock_bh(&tgt_dev->tgt_dev_lock);
}
TRACE_EXIT();
return;
}
/* dev_lock supposed to be locked and BHs off */
static void scst_abort_cmds_tgt_dev(struct scst_tgt_dev *tgt_dev,
struct scst_cmd *exclude_cmd)
{
struct scst_session *sess = tgt_dev->sess;
struct scst_cmd *cmd;
TRACE_ENTRY();
TRACE_MGMT_DBG("QErr: aborting commands for tgt_dev %p "
"(exclude_cmd %p), if there are any", tgt_dev, exclude_cmd);
spin_lock_irq(&sess->sess_list_lock);
list_for_each_entry(cmd, &sess->sess_cmd_list, sess_cmd_list_entry) {
if (cmd == exclude_cmd)
continue;
if ((cmd->tgt_dev == tgt_dev) ||
((cmd->tgt_dev == NULL) &&
(cmd->lun == tgt_dev->lun))) {
scst_abort_cmd(cmd, NULL, (tgt_dev != exclude_cmd->tgt_dev), 0);
}
}
spin_unlock_irq(&sess->sess_list_lock);
TRACE_EXIT();
return;
}
/* dev_lock supposed to be locked and BHs off */
static void scst_abort_cmds_dev(struct scst_device *dev,
struct scst_cmd *exclude_cmd)
{
struct scst_tgt_dev *tgt_dev;
uint8_t sense_buffer[SCST_STANDARD_SENSE_LEN];
int sl = 0;
bool set_ua = (dev->tas == 0);
TRACE_ENTRY();
TRACE_MGMT_DBG("QErr: Aborting commands for dev %p (exclude_cmd %p, "
"set_ua %d), if there are any", dev, exclude_cmd, set_ua);
if (set_ua)
sl = scst_set_sense(sense_buffer, sizeof(sense_buffer), dev->d_sense,
SCST_LOAD_SENSE(scst_sense_cleared_by_another_ini_UA));
list_for_each_entry(tgt_dev, &dev->dev_tgt_dev_list, dev_tgt_dev_list_entry) {
scst_abort_cmds_tgt_dev(tgt_dev, exclude_cmd);
/*
* Potentially, setting UA here, when the aborted commands are
* still running, can lead to a situation that one of them could
* take it, then that would be detected and the UA requeued.
* But, meanwhile, one or more subsequent, i.e. not aborted,
* commands can "leak" executed normally. So, as result, the
* UA would be delivered one or more commands "later". However,
* that should be OK, because, if multiple commands are being
* executed in parallel, you can't control exact order of UA
* delivery anyway.
*/
if (set_ua && (tgt_dev != exclude_cmd->tgt_dev))
scst_check_set_UA(tgt_dev, sense_buffer, sl, 0);
}
TRACE_EXIT();
return;
}
/* No locks */
static void scst_process_qerr(struct scst_cmd *cmd)
{
bool unblock = false;
struct scst_device *dev = cmd->dev;
unsigned int qerr, q;
TRACE_ENTRY();
/* dev->qerr can be changed behind our back */
q = dev->qerr;
qerr = READ_ONCE(q); /* READ_ONCE() doesn't work for bit fields */
TRACE_DBG("Processing QErr %d for cmd %p", qerr, cmd);
spin_lock_bh(&dev->dev_lock);
switch (qerr) {
case SCST_QERR_2_RESERVED:
default:
PRINT_WARNING("Invalid QErr value %x for device %s, process as "
"0", qerr, dev->virt_name);
fallthrough;
case SCST_QERR_0_ALL_RESUME:
/* Nothing to do */
break;
case SCST_QERR_1_ABORT_ALL:
if (dev->tst == SCST_TST_0_SINGLE_TASK_SET)
scst_abort_cmds_dev(dev, cmd);
else
scst_abort_cmds_tgt_dev(cmd->tgt_dev, cmd);
unblock = true;
break;
case SCST_QERR_3_ABORT_THIS_NEXUS_ONLY:
scst_abort_cmds_tgt_dev(cmd->tgt_dev, cmd);
unblock = true;
break;
}
spin_unlock_bh(&dev->dev_lock);
if (unblock)
scst_unblock_aborted_cmds(cmd->tgt, cmd->sess, dev);
TRACE_EXIT();
return;
}
/*
* No locks. Returns -1, if processing should be switched to another cmd, 1
* if cmd was aborted, 0 if cmd processing should continue.
*/
int scst_process_check_condition(struct scst_cmd *cmd)
{
int res;
struct scst_order_data *order_data;
struct scst_device *dev;
TRACE_ENTRY();
EXTRACHECKS_BUG_ON(test_bit(SCST_CMD_NO_RESP, &cmd->cmd_flags));
order_data = cmd->cur_order_data;
dev = cmd->dev;
TRACE((order_data->aca_tgt_dev != 0) ? TRACE_MGMT_DEBUG : TRACE_DEBUG,
"CHECK CONDITION for cmd %p (naca %d, cmd_aca_allowed %d, "
"ACA allowed cmd %d, tgt_dev %p, aca_tgt_dev %lu, aca_cmd %p)",
cmd, cmd->cmd_naca, cmd->cmd_aca_allowed,
cmd->queue_type == SCST_CMD_QUEUE_ACA, cmd->tgt_dev,
order_data->aca_tgt_dev, order_data->aca_cmd);
spin_lock_irq(&order_data->sn_lock);
if (order_data->aca_tgt_dev != 0) {
if (((cmd->queue_type == SCST_CMD_QUEUE_ACA) &&
(order_data->aca_tgt_dev == (unsigned long)cmd->tgt_dev)) ||
((cmd->cdb[0] == PERSISTENT_RESERVE_OUT) &&
((cmd->cdb[1] & 0x1f) == PR_PREEMPT_AND_ABORT))) {
if (!cmd->cmd_naca) {
if (order_data->aca_cmd == cmd) {
/*
* Clear it to prevent from be
* aborted during ACA clearing
*/
TRACE_MGMT_DBG("Check condition of ACA "
"cmd %p", cmd);
order_data->aca_cmd = NULL;
}
spin_unlock_irq(&order_data->sn_lock);
scst_clear_aca(cmd->tgt_dev,
(order_data->aca_tgt_dev != (unsigned long)cmd->tgt_dev));
/*
* Goto directly to avoid race when ACA
* reestablished during retaking sn_lock
* once again.
*/
goto process_qerr;
}
}
if (test_bit(SCST_CMD_ABORTED, &cmd->cmd_flags)) {
/*
* cmd can be aborted and the unblock
* procedure finished while we were
* entering here. I.e. cmd can not be
* blocked anymore for any case.
*/
res = 1;
goto out_unlock;
} else if (!cmd->cmd_aca_allowed) {
TRACE_MGMT_DBG("Deferring CHECK CONDITION "
"cmd %p due to ACA active (tgt_dev %p)",
cmd, cmd->tgt_dev);
order_data->def_cmd_count++;
/*
* Put cmd in the head to let restart earlier:
* it is already completed and completed with
* CHECK CONDITION
*/
list_add(&cmd->deferred_cmd_list_entry,
&order_data->deferred_cmd_list);
res = -1;
goto out_unlock;
}
}
if (cmd->cmd_naca) {
TRACE_MGMT_DBG("Establishing ACA for dev %s (lun %lld, cmd %p, "
"tgt_dev %p)", dev->virt_name, (unsigned long long)cmd->lun,
cmd, cmd->tgt_dev);
order_data->aca_tgt_dev = (unsigned long)cmd->tgt_dev;
}
spin_unlock_irq(&order_data->sn_lock);
process_qerr:
scst_process_qerr(cmd);
scst_store_sense(cmd);
res = 0;
out:
TRACE_EXIT_RES(res);
return res;
out_unlock:
spin_unlock_irq(&order_data->sn_lock);
goto out;
}
void scst_xmit_process_aborted_cmd(struct scst_cmd *cmd)
{
TRACE_ENTRY();
TRACE_MGMT_DBG("Aborted cmd %p done (cmd_ref %d)", cmd,
atomic_read(&cmd->cmd_ref));
scst_done_cmd_mgmt(cmd);
if (test_bit(SCST_CMD_ABORTED_OTHER, &cmd->cmd_flags)) {
if (cmd->completed) {
/* It's completed and it's OK to return its result */
goto out;
}
/* For not yet inited commands cmd->dev can be NULL here */
if (test_bit(SCST_CMD_DEVICE_TAS, &cmd->cmd_flags)) {
TRACE_MGMT_DBG("Flag ABORTED OTHER set for cmd %p "
"(tag %llu), returning TASK ABORTED ", cmd,
(unsigned long long)cmd->tag);
scst_set_cmd_error_status(cmd, SAM_STAT_TASK_ABORTED);
} else {
TRACE_MGMT_DBG("Flag ABORTED OTHER set for cmd %p "
"(tag %llu), aborting without delivery or "
"notification",
cmd, (unsigned long long)cmd->tag);
/*
* There is no need to check/requeue possible UA,
* because, if it exists, it will be delivered
* by the "completed" branch above.
*/
clear_bit(SCST_CMD_ABORTED_OTHER, &cmd->cmd_flags);
}
}
out:
TRACE_EXIT();
return;
}
/*
* scst_get_max_lun_commands() - return maximum supported commands count
*
* Returns maximum commands count which can be queued to this LUN in this
* session.
*
* If lun is NO_SUCH_LUN, returns minimum of maximum commands count which
* can be queued to any LUN in this session.
*
* If sess is NULL, returns minimum of maximum commands count which can be
* queued to any SCST device.
*/
int scst_get_max_lun_commands(struct scst_session *sess, uint64_t lun)
{
const int init_res = 0xFFFFFF;
int res = init_res, i;
TRACE_ENTRY();
mutex_lock(&scst_mutex);
if (sess == NULL) {
struct scst_device *dev;
list_for_each_entry(dev, &scst_dev_list, dev_list_entry) {
if (dev->handler == &scst_null_devtype)
continue;
TRACE_DBG("dev %s, max_tgt_dev_commands %d (res %d)",
dev->virt_name, dev->max_tgt_dev_commands, res);
if (res > dev->max_tgt_dev_commands)
res = dev->max_tgt_dev_commands;
}
goto out_unlock;
}
if (lun != NO_SUCH_LUN) {
struct list_head *head =
&sess->sess_tgt_dev_list[SESS_TGT_DEV_LIST_HASH_FN(lun)];
struct scst_tgt_dev *tgt_dev;
list_for_each_entry(tgt_dev, head, sess_tgt_dev_list_entry) {
if (tgt_dev->lun == lun) {
res = tgt_dev->dev->max_tgt_dev_commands;
TRACE_DBG("tgt_dev %p, dev %s, max_tgt_dev_commands "
"%d (res %d)", tgt_dev, tgt_dev->dev->virt_name,
tgt_dev->dev->max_tgt_dev_commands, res);
break;
}
}
goto out_unlock;
}
for (i = 0; i < SESS_TGT_DEV_LIST_HASH_SIZE; i++) {
struct list_head *head = &sess->sess_tgt_dev_list[i];
struct scst_tgt_dev *tgt_dev;
list_for_each_entry(tgt_dev, head, sess_tgt_dev_list_entry) {
if (res > tgt_dev->dev->max_tgt_dev_commands)
res = tgt_dev->dev->max_tgt_dev_commands;
}
}
out_unlock:
mutex_unlock(&scst_mutex);
TRACE_EXIT_RES(res);
return res;
}
EXPORT_SYMBOL(scst_get_max_lun_commands);
/*
* scst_reassign_retained_sess_states() - reassigns retained states
*
* Reassigns retained during nexus loss states from old_sess to new_sess.
*/
void scst_reassign_retained_sess_states(struct scst_session *new_sess,
struct scst_session *old_sess)
{
struct scst_device *dev;
TRACE_ENTRY();
TRACE_MGMT_DBG("Reassigning retained states from old_sess %p to "
"new_sess %p", old_sess, new_sess);
if ((new_sess == NULL) || (old_sess == NULL)) {
TRACE_DBG("%s", "new_sess or old_sess is NULL");
goto out;
}
if (new_sess == old_sess) {
TRACE_DBG("%s", "new_sess or old_sess are the same");
goto out;
}
if ((new_sess->transport_id == NULL) ||
(old_sess->transport_id == NULL)) {
TRACE_DBG("%s", "new_sess or old_sess doesn't support PRs");
goto out;
}
mutex_lock(&scst_mutex);
list_for_each_entry(dev, &scst_dev_list, dev_list_entry) {
struct scst_tgt_dev *tgt_dev;
struct scst_tgt_dev *new_tgt_dev = NULL, *old_tgt_dev = NULL;
struct scst_lksb pr_lksb;
TRACE_DBG("Processing dev %s", dev->virt_name);
list_for_each_entry(tgt_dev, &dev->dev_tgt_dev_list,
dev_tgt_dev_list_entry) {
if (tgt_dev->sess == new_sess) {
new_tgt_dev = tgt_dev;
if (old_tgt_dev != NULL)
break;
}
if (tgt_dev->sess == old_sess) {
old_tgt_dev = tgt_dev;
if (new_tgt_dev != NULL)
break;
}
}
if ((new_tgt_dev == NULL) || (old_tgt_dev == NULL)) {
TRACE_DBG("new_tgt_dev %p or old_sess %p is NULL, "
"skipping (dev %s)", new_tgt_dev, old_tgt_dev,
dev->virt_name);
continue;
}
/** Reassign regular reservations **/
scst_res_lock(dev, &pr_lksb);
if (scst_is_reservation_holder(dev, old_sess)) {
scst_reserve_dev(dev, new_sess);
TRACE_DBG("Reservation reassigned from old_tgt_dev %p "
"to new_tgt_dev %p", old_tgt_dev, new_tgt_dev);
}
scst_res_unlock(dev, &pr_lksb);
/** Reassign PRs **/
if ((new_sess->transport_id == NULL) ||
(old_sess->transport_id == NULL)) {
TRACE_DBG("%s", "new_sess or old_sess doesn't support PRs");
goto next;
}
scst_pr_write_lock(dev);
if (old_tgt_dev->registrant != NULL) {
TRACE_PR("Reassigning reg %p from tgt_dev %p to %p",
old_tgt_dev->registrant, old_tgt_dev,
new_tgt_dev);
if (new_tgt_dev->registrant != NULL)
new_tgt_dev->registrant->tgt_dev = NULL;
new_tgt_dev->registrant = old_tgt_dev->registrant;
new_tgt_dev->registrant->tgt_dev = new_tgt_dev;
old_tgt_dev->registrant = NULL;
}
scst_pr_write_unlock(dev);
next:
/** Reassign other DH specific states **/
if (dev->handler->reassign_retained_states != NULL) {
TRACE_DBG("Calling dev's %s reassign_retained_states(%p, %p)",
dev->virt_name, new_tgt_dev, old_tgt_dev);
dev->handler->reassign_retained_states(new_tgt_dev, old_tgt_dev);
TRACE_DBG("Dev's %s reassign_retained_states() returned",
dev->virt_name);
}
}
mutex_unlock(&scst_mutex);
out:
TRACE_EXIT();
return;
}
EXPORT_SYMBOL(scst_reassign_retained_sess_states);
/*
* scst_get_next_lexem() - parse and return next lexem in the string
*
* Returns pointer to the next lexem from token_str skipping
* spaces and '=' character and using them then as a delimiter. Content
* of token_str is modified by setting '\0' at the delimiter's position.
*/
char *scst_get_next_lexem(char **token_str)
{
char *p, *q;
static char blank = '\0';
if ((token_str == NULL) || (*token_str == NULL))
return &blank;
for (p = *token_str; (*p != '\0') && (isspace(*p) || (*p == '=')); p++)
;
for (q = p; (*q != '\0') && !isspace(*q) && (*q != '='); q++)
;
if (*q != '\0')
*q++ = '\0';
*token_str = q;
return p;
}
EXPORT_SYMBOL_GPL(scst_get_next_lexem);
/*
* scst_restore_token_str() - restore string modified by scst_get_next_lexem()
*
* Restores token_str modified by scst_get_next_lexem() to the
* previous value before scst_get_next_lexem() was called. Prev_lexem is
* a pointer to lexem returned by scst_get_next_lexem().
*/
void scst_restore_token_str(char *prev_lexem, char *token_str)
{
if (&prev_lexem[strlen(prev_lexem)] != token_str)
prev_lexem[strlen(prev_lexem)] = ' ';
return;
}
EXPORT_SYMBOL_GPL(scst_restore_token_str);
/*
* scst_get_next_token_str() - parse and return next token
*
* This function returns pointer to the next token strings from input_str
* using '\n', ';' and '\0' as a delimiter. Content of input_str is
* modified by setting '\0' at the delimiter's position.
*/
char *scst_get_next_token_str(char **input_str)
{
char *p = *input_str;
int i = 0;
while ((p[i] != '\n') && (p[i] != ';') && (p[i] != '\0'))
i++;
if (i == 0)
return NULL;
if (p[i] == '\0')
*input_str = &p[i];
else
*input_str = &p[i+1];
p[i] = '\0';
return p;
}
EXPORT_SYMBOL_GPL(scst_get_next_token_str);
static int scst_parse_unmap_descriptors(struct scst_cmd *cmd)
{
int res = 0;
ssize_t length = 0;
uint8_t *address;
int i, cnt, offset, descriptor_len, total_len;
struct scst_data_descriptor *pd;
TRACE_ENTRY();
EXTRACHECKS_BUG_ON(cmd->cmd_data_descriptors != NULL);
EXTRACHECKS_BUG_ON(cmd->cmd_data_descriptors_cnt != 0);
length = scst_get_buf_full_sense(cmd, &address);
if (unlikely(length <= 0)) {
if (length == 0)
goto out;
else
goto out_abn;
}
total_len = get_unaligned_be16(&cmd->cdb[7]);
offset = 8;
descriptor_len = get_unaligned_be16(&address[2]);
TRACE_DBG("total_len %d, descriptor_len %d", total_len, descriptor_len);
if (descriptor_len == 0)
goto out_put;
if (unlikely((descriptor_len > (total_len - 8)) ||
((descriptor_len % 16) != 0))) {
PRINT_ERROR("Bad descriptor length: %d < %d - 8",
descriptor_len, total_len);
scst_set_invalid_field_in_parm_list(cmd, 2, 0);
goto out_abn_put;
}
cnt = descriptor_len/16;
if (cnt == 0)
goto out_put;
pd = kcalloc(cnt, sizeof(*pd), GFP_KERNEL);
if (pd == NULL) {
PRINT_ERROR("Unable to kmalloc UNMAP %d descriptors", cnt+1);
scst_set_busy(cmd);
goto out_abn_put;
}
TRACE_DBG("cnt %d, pd %p", cnt, pd);
i = 0;
while ((offset - 8) < descriptor_len) {
struct scst_data_descriptor *d = &pd[i];
d->sdd_lba = get_unaligned_be64(&address[offset]);
offset += 8;
d->sdd_blocks = get_unaligned_be32(&address[offset]);
offset += 8;
TRACE_DBG("i %d, lba %lld, blocks %lld", i,
(long long)d->sdd_lba, (long long)d->sdd_blocks);
i++;
}
cmd->cmd_data_descriptors = pd;
cmd->cmd_data_descriptors_cnt = cnt;
out_put:
scst_put_buf_full(cmd, address);
out:
TRACE_EXIT_RES(res);
return res;
out_abn_put:
scst_put_buf_full(cmd, address);
out_abn:
scst_set_cmd_abnormal_done_state(cmd);
res = -1;
goto out;
}
static void scst_free_unmap_descriptors(struct scst_cmd *cmd)
{
TRACE_ENTRY();
kfree(cmd->cmd_data_descriptors);
cmd->cmd_data_descriptors = NULL;
TRACE_EXIT();
return;
}
int scst_parse_descriptors(struct scst_cmd *cmd)
{
int res;
TRACE_ENTRY();
switch (cmd->cdb[0]) {
case UNMAP:
res = scst_parse_unmap_descriptors(cmd);
break;
case EXTENDED_COPY:
res = scst_cm_parse_descriptors(cmd);
break;
default:
sBUG();
}
TRACE_EXIT_RES(res);
return res;
}
static void scst_free_descriptors(struct scst_cmd *cmd)
{
TRACE_ENTRY();
switch (cmd->cdb[0]) {
case UNMAP:
scst_free_unmap_descriptors(cmd);
break;
case EXTENDED_COPY:
scst_cm_free_descriptors(cmd);
break;
default:
sBUG();
break;
}
TRACE_EXIT();
return;
}
/**
** We currently have only few saved parameters and it is impossible to get
** pointer on a bit field, so let's have a simple straightforward
** implementation.
**/
#define SCST_TAS_LABEL "TAS"
#define SCST_QERR_LABEL "QERR"
#define SCST_TMF_ONLY_LABEL "TMF_ONLY"
#define SCST_SWP_LABEL "SWP"
#define SCST_DSENSE_LABEL "D_SENSE"
#define SCST_QUEUE_ALG_LABEL "QUEUE_ALG"
#define SCST_DPICZ_LABEL "DPICZ"
int scst_save_global_mode_pages(const struct scst_device *dev,
uint8_t *buf, int size)
{
int res = 0;
TRACE_ENTRY();
if (dev->tas != dev->tas_default) {
res += scnprintf(&buf[res], size - res, "%s=%d\n",
SCST_TAS_LABEL, dev->tas);
if (res >= size-1)
goto out_overflow;
}
if (dev->qerr != dev->qerr_default) {
res += scnprintf(&buf[res], size - res, "%s=%d\n",
SCST_QERR_LABEL, dev->qerr);
if (res >= size-1)
goto out_overflow;
}
if (dev->tmf_only != dev->tmf_only_default) {
res += scnprintf(&buf[res], size - res, "%s=%d\n",
SCST_TMF_ONLY_LABEL, dev->tmf_only);
if (res >= size-1)
goto out_overflow;
}
if (dev->swp != dev->swp_default) {
res += scnprintf(&buf[res], size - res, "%s=%d\n",
SCST_SWP_LABEL, dev->swp);
if (res >= size-1)
goto out_overflow;
}
if (dev->d_sense != dev->d_sense_default) {
res += scnprintf(&buf[res], size - res, "%s=%d\n",
SCST_DSENSE_LABEL, dev->d_sense);
if (res >= size-1)
goto out_overflow;
}
if (dev->dpicz != dev->dpicz_default) {
res += scnprintf(&buf[res], size - res, "%s=%d\n",
SCST_DPICZ_LABEL, dev->dpicz);
if (res >= size-1)
goto out_overflow;
}
if (dev->queue_alg != dev->queue_alg_default) {
res += scnprintf(&buf[res], size - res, "%s=%d\n",
SCST_QUEUE_ALG_LABEL, dev->queue_alg);
if (res >= size-1)
goto out_overflow;
}
out:
TRACE_EXIT_RES(res);
return res;
out_overflow:
PRINT_ERROR("Global mode pages buffer overflow (size %d)", size);
res = -EOVERFLOW;
goto out;
}
EXPORT_SYMBOL_GPL(scst_save_global_mode_pages);
static int scst_restore_tas(struct scst_device *dev, unsigned int val)
{
int res;
TRACE_ENTRY();
if (val > 1) {
PRINT_ERROR("Invalid value %d for parameter %s (device %s)",
val, SCST_TAS_LABEL, dev->virt_name);
res = -EINVAL;
goto out;
}
dev->tas = val;
dev->tas_saved = val;
PRINT_INFO("%s restored to %d for device %s", SCST_TAS_LABEL,
dev->tas, dev->virt_name);
res = 0;
out:
TRACE_EXIT_RES(res);
return res;
}
static int scst_restore_qerr(struct scst_device *dev, unsigned int val)
{
int res;
TRACE_ENTRY();
if ((val == SCST_QERR_2_RESERVED) ||
(val > SCST_QERR_3_ABORT_THIS_NEXUS_ONLY)) {
PRINT_ERROR("Invalid value %d for parameter %s (device %s)",
val, SCST_QERR_LABEL, dev->virt_name);
res = -EINVAL;
goto out;
}
dev->qerr = val;
dev->qerr_saved = val;
PRINT_INFO("%s restored to %d for device %s", SCST_QERR_LABEL,
dev->qerr, dev->virt_name);
res = 0;
out:
TRACE_EXIT_RES(res);
return res;
}
static int scst_restore_tmf_only(struct scst_device *dev, unsigned int val)
{
int res;
TRACE_ENTRY();
if (val > 1) {
PRINT_ERROR("Invalid value %d for parameter %s (device %s)",
val, SCST_TMF_ONLY_LABEL, dev->virt_name);
res = -EINVAL;
goto out;
}
dev->tmf_only = val;
dev->tmf_only_saved = val;
PRINT_INFO("%s restored to %d for device %s", SCST_TMF_ONLY_LABEL,
dev->tmf_only, dev->virt_name);
res = 0;
out:
TRACE_EXIT_RES(res);
return res;
}
static int scst_restore_swp(struct scst_device *dev, unsigned int val)
{
int res;
TRACE_ENTRY();
if (val > 1) {
PRINT_ERROR("Invalid value %d for parameter %s (device %s)",
val, SCST_SWP_LABEL, dev->virt_name);
res = -EINVAL;
goto out;
}
dev->swp = val;
dev->swp_saved = val;
PRINT_INFO("%s restored to %d for device %s", SCST_SWP_LABEL,
dev->swp, dev->virt_name);
res = 0;
out:
TRACE_EXIT_RES(res);
return res;
}
static int scst_restore_dsense(struct scst_device *dev, unsigned int val)
{
int res;
TRACE_ENTRY();
if (val > 1) {
PRINT_ERROR("Invalid value %d for parameter %s (device %s)",
val, SCST_DSENSE_LABEL, dev->virt_name);
res = -EINVAL;
goto out;
}
dev->d_sense = val;
dev->d_sense_saved = val;
PRINT_INFO("%s restored to %d for device %s", SCST_DSENSE_LABEL,
dev->d_sense, dev->virt_name);
res = 0;
out:
TRACE_EXIT_RES(res);
return res;
}
static int scst_restore_dpicz(struct scst_device *dev, unsigned int val)
{
int res;
TRACE_ENTRY();
if (val > 1) {
PRINT_ERROR("Invalid value %d for parameter %s (device %s)",
val, SCST_DPICZ_LABEL, dev->virt_name);
res = -EINVAL;
goto out;
}
dev->dpicz = val;
dev->dpicz_saved = val;
PRINT_INFO("%s restored to %d for device %s", SCST_DPICZ_LABEL,
dev->dpicz, dev->virt_name);
res = 0;
out:
TRACE_EXIT_RES(res);
return res;
}
static int scst_restore_queue_alg(struct scst_device *dev, unsigned int val)
{
int res;
TRACE_ENTRY();
if ((val != SCST_QUEUE_ALG_0_RESTRICTED_REORDER) &&
(val != SCST_QUEUE_ALG_1_UNRESTRICTED_REORDER)) {
PRINT_ERROR("Invalid value %d for parameter %s (device %s)",
val, SCST_QUEUE_ALG_LABEL, dev->virt_name);
res = -EINVAL;
goto out;
}
dev->queue_alg = val;
dev->queue_alg_saved = val;
PRINT_INFO("%s restored to %d for device %s", SCST_QUEUE_ALG_LABEL,
dev->queue_alg, dev->virt_name);
res = 0;
out:
TRACE_EXIT_RES(res);
return res;
}
/* Params are NULL-terminated */
int scst_restore_global_mode_pages(struct scst_device *dev, char *params,
char **last_param)
{
int res;
char *param, *p, *pp;
unsigned long val;
TRACE_ENTRY();
while (1) {
param = scst_get_next_token_str(&params);
if (param == NULL)
break;
p = scst_get_next_lexem(&param);
if (*p == '\0')
break;
pp = scst_get_next_lexem(&param);
if (*pp == '\0')
goto out_need_param;
if (scst_get_next_lexem(&param)[0] != '\0')
goto out_too_many;
res = kstrtoul(pp, 0, &val);
if (res != 0)
goto out_strtoul_failed;
if (strcasecmp(SCST_TAS_LABEL, p) == 0)
res = scst_restore_tas(dev, val);
else if (strcasecmp(SCST_QERR_LABEL, p) == 0)
res = scst_restore_qerr(dev, val);
else if (strcasecmp(SCST_TMF_ONLY_LABEL, p) == 0)
res = scst_restore_tmf_only(dev, val);
else if (strcasecmp(SCST_SWP_LABEL, p) == 0)
res = scst_restore_swp(dev, val);
else if (strcasecmp(SCST_DSENSE_LABEL, p) == 0)
res = scst_restore_dsense(dev, val);
else if (strcasecmp(SCST_DPICZ_LABEL, p) == 0)
res = scst_restore_dpicz(dev, val);
else if (strcasecmp(SCST_QUEUE_ALG_LABEL, p) == 0)
res = scst_restore_queue_alg(dev, val);
else {
TRACE_DBG("Unknown parameter %s", p);
scst_restore_token_str(p, param);
*last_param = p;
goto out;
}
if (res != 0)
goto out;
}
*last_param = NULL;
res = 0;
out:
TRACE_EXIT_RES(res);
return res;
out_strtoul_failed:
PRINT_ERROR("strtoul() for %s failed: %d (device %s)", pp, res,
dev->virt_name);
goto out;
out_need_param:
PRINT_ERROR("Parameter %s value missed for device %s", p, dev->virt_name);
res = -EINVAL;
goto out;
out_too_many:
PRINT_ERROR("Too many parameter's %s values (device %s)", p, dev->virt_name);
res = -EINVAL;
goto out;
}
EXPORT_SYMBOL_GPL(scst_restore_global_mode_pages);
/* Must be called under dev_lock and BHs off. Might release it, then reacquire. */
void __scst_ext_blocking_done(struct scst_device *dev)
{
bool stop;
TRACE_ENTRY();
TRACE_BLOCK("Notifying ext blockers for dev %s (ext_blocks_cnt %d)",
dev->virt_name, dev->ext_blocks_cnt);
stop = list_empty(&dev->ext_blockers_list);
while (!stop) {
struct scst_ext_blocker *b;
b = list_first_entry(&dev->ext_blockers_list, typeof(*b),
ext_blockers_list_entry);
TRACE_DBG("Notifying async ext blocker %p (cnt %d)", b,
dev->ext_blocks_cnt);
list_del(&b->ext_blockers_list_entry);
stop = list_empty(&dev->ext_blockers_list);
if (stop)
dev->ext_blocking_pending = 0;
spin_unlock_bh(&dev->dev_lock);
b->ext_blocker_done_fn(dev, b->ext_blocker_data,
b->ext_blocker_data_len);
kfree(b);
spin_lock_bh(&dev->dev_lock);
}
TRACE_EXIT();
return;
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20)
static void scst_ext_blocking_done_fn(void *p)
{
struct scst_device *dev = p;
#else
static void scst_ext_blocking_done_fn(struct work_struct *work)
{
struct scst_device *dev = container_of(work, struct scst_device,
ext_blockers_work);
#endif
TRACE_ENTRY();
spin_lock_bh(&dev->dev_lock);
WARN_ON(!dev->ext_unblock_scheduled);
/* We might have new ext blocker any time w/o dev_lock */
while (!list_empty(&dev->ext_blockers_list))
__scst_ext_blocking_done(dev);
WARN_ON(!dev->ext_unblock_scheduled);
dev->ext_unblock_scheduled = 0;
spin_unlock_bh(&dev->dev_lock);
TRACE_EXIT();
return;
}
/* Must be called under dev_lock and BHs off */
void scst_ext_blocking_done(struct scst_device *dev)
{
TRACE_ENTRY();
lockdep_assert_held(&dev->dev_lock);
if (dev->ext_unblock_scheduled)
goto out;
TRACE_DBG("Scheduling ext_blockers_work for dev %s", dev->virt_name);
dev->ext_unblock_scheduled = 1;
schedule_work(&dev->ext_blockers_work);
out:
TRACE_EXIT();
return;
}
static void scst_sync_ext_blocking_done(struct scst_device *dev,
uint8_t *data, int len)
{
wait_queue_head_t *w;
TRACE_ENTRY();
w = (void *)*((unsigned long *)data);
wake_up_all(w);
TRACE_EXIT();
return;
}
int scst_ext_block_dev(struct scst_device *dev, ext_blocker_done_fn_t done_fn,
const uint8_t *priv, int priv_len, int flags)
{
int res;
struct scst_ext_blocker *b;
TRACE_ENTRY();
if (flags & SCST_EXT_BLOCK_SYNC)
priv_len = sizeof(void *);
b = kzalloc(sizeof(*b) + priv_len, GFP_KERNEL);
if (b == NULL) {
PRINT_ERROR("Unable to alloc struct scst_ext_blocker with data "
"(size %zd)", sizeof(*b) + priv_len);
res = -ENOMEM;
goto out;
}
TRACE_MGMT_DBG("New %d ext blocker %p for dev %s (flags %x)",
dev->ext_blocks_cnt+1, b, dev->virt_name, flags);
spin_lock_bh(&dev->dev_lock);
if (dev->strictly_serialized_cmd_waiting) {
/*
* Avoid deadlock when this strictly serialized cmd
* will not proceed stopped on our blocking, so our
* blocking does not proceed as well.
*/
TRACE_DBG("Unstrictlyserialize dev %s", dev->virt_name);
dev->strictly_serialized_cmd_waiting = 0;
/* We will reuse blocking done by the strictly serialized cmd */
} else
scst_block_dev(dev);
if (flags & SCST_EXT_BLOCK_STPG) {
WARN_ON(dev->stpg_ext_blocked);
dev->stpg_ext_blocked = 1;
}
dev->ext_blocks_cnt++;
TRACE_DBG("ext_blocks_cnt %d", dev->ext_blocks_cnt);
if ((flags & SCST_EXT_BLOCK_SYNC) && (dev->on_dev_cmd_count == 0)) {
TRACE_DBG("No commands to wait for sync blocking (dev %s)",
dev->virt_name);
spin_unlock_bh(&dev->dev_lock);
goto out_free_success;
}
list_add_tail(&b->ext_blockers_list_entry, &dev->ext_blockers_list);
dev->ext_blocking_pending = 1;
if (flags & SCST_EXT_BLOCK_SYNC) {
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(w);
b->ext_blocker_done_fn = scst_sync_ext_blocking_done;
*((void **)&b->ext_blocker_data[0]) = &w;
wait_event_locked(w, (dev->on_dev_cmd_count == 0),
lock_bh, dev->dev_lock);
spin_unlock_bh(&dev->dev_lock);
} else {
b->ext_blocker_done_fn = done_fn;
if (priv_len > 0) {
b->ext_blocker_data_len = priv_len;
memcpy(b->ext_blocker_data, priv, priv_len);
}
if (dev->on_dev_cmd_count == 0) {
TRACE_DBG("No commands to wait for async blocking "
"(dev %s)", dev->virt_name);
if (!dev->ext_unblock_scheduled)
__scst_ext_blocking_done(dev);
spin_unlock_bh(&dev->dev_lock);
} else
spin_unlock_bh(&dev->dev_lock);
}
out_success:
res = 0;
out:
TRACE_EXIT_RES(res);
return res;
out_free_success:
sBUG_ON(!(flags & SCST_EXT_BLOCK_SYNC));
kfree(b);
goto out_success;
}
void scst_ext_unblock_dev(struct scst_device *dev, bool stpg)
{
TRACE_ENTRY();
spin_lock_bh(&dev->dev_lock);
if (dev->ext_blocks_cnt == 0) {
TRACE_DBG("Nothing to unblock (dev %s)", dev->virt_name);
goto out_unlock;
}
if ((dev->ext_blocks_cnt == 1) && dev->stpg_ext_blocked && !stpg) {
/*
* User space is sending too many unblock calls during
* STPG processing
*/
TRACE_MGMT_DBG("Can not unblock internal STPG ext block "
"(dev %s, ext_blocks_cnt %d, stpg_ext_blocked %d, stpg %d)",
dev->virt_name, dev->ext_blocks_cnt,
dev->stpg_ext_blocked, stpg);
goto out_unlock;
}
dev->ext_blocks_cnt--;
TRACE_MGMT_DBG("Ext unblocking for dev %s (left: %d, pending %d)",
dev->virt_name, dev->ext_blocks_cnt,
dev->ext_blocking_pending);
if ((dev->ext_blocks_cnt == 0) && dev->ext_blocking_pending) {
int rc;
/* Wait pending ext blocking to finish */
spin_unlock_bh(&dev->dev_lock);
TRACE_DBG("Ext unblock (dev %s): still pending...",
dev->virt_name);
rc = scst_ext_block_dev(dev, NULL, NULL, 0, SCST_EXT_BLOCK_SYNC);
if (rc != 0) {
/* Oops, have to poll */
PRINT_WARNING("scst_ext_block_dev(dev %s) failed, "
"switch to polling", dev->virt_name);
spin_lock_bh(&dev->dev_lock);
while (dev->ext_blocking_pending) {
spin_unlock_bh(&dev->dev_lock);
msleep(10);
spin_lock_bh(&dev->dev_lock);
}
spin_unlock_bh(&dev->dev_lock);
} else {
TRACE_DBG("Ext unblock: pending done, unblocking...");
scst_ext_unblock_dev(dev, stpg);
}
spin_lock_bh(&dev->dev_lock);
}
scst_unblock_dev(dev);
out_unlock:
spin_unlock_bh(&dev->dev_lock);
TRACE_EXIT();
return;
}
/* Abstract vfs_unlink() for different kernel versions (as possible) */
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 39)
void scst_vfs_unlink_and_put_nd(struct nameidata *nd)
{
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25)
vfs_unlink(nd->dentry->d_parent->d_inode, nd->dentry);
dput(nd->dentry);
mntput(nd->mnt);
#else
vfs_unlink(nd->path.dentry->d_parent->d_inode,
nd->path.dentry);
path_put(&nd->path);
#endif
}
#endif
void scst_vfs_unlink_and_put(struct path *path)
{
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 13, 0) && \
(!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 7) && \
(!defined(CONFIG_SUSE_KERNEL) || \
LINUX_VERSION_CODE < KERNEL_VERSION(3, 12, 0))
vfs_unlink(path->dentry->d_parent->d_inode, path->dentry);
#else
vfs_unlink(path->dentry->d_parent->d_inode, path->dentry, NULL);
#endif
path_put(path);
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 39)
void scst_path_put(struct nameidata *nd)
{
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25)
dput(nd->dentry);
mntput(nd->mnt);
#else
path_put(&nd->path);
#endif
}
EXPORT_SYMBOL(scst_path_put);
#endif
int scst_copy_file(const char *src, const char *dest)
{
int res = 0;
struct inode *inode;
loff_t file_size, pos;
uint8_t *buf = NULL;
struct file *file_src = NULL, *file_dest = NULL;
TRACE_ENTRY();
if (src == NULL || dest == NULL) {
res = -EINVAL;
PRINT_ERROR("%s", "Invalid persistent files path - backup "
"skipped");
goto out;
}
TRACE_DBG("Copying '%s' into '%s'", src, dest);
file_src = filp_open(src, O_RDONLY, 0);
if (IS_ERR(file_src)) {
res = PTR_ERR(file_src);
TRACE_DBG("Unable to open file '%s' - error %d", src, res);
goto out_free;
}
file_dest = filp_open(dest, O_WRONLY | O_CREAT | O_TRUNC, 0644);
if (IS_ERR(file_dest)) {
res = PTR_ERR(file_dest);
TRACE_DBG("Unable to open backup file '%s' - error %d", dest,
res);
goto out_close;
}
inode = file_inode(file_src);
if (S_ISREG(inode->i_mode)) {
/* Nothing to do */
} else if (S_ISBLK(inode->i_mode)) {
inode = inode->i_bdev->bd_inode;
} else {
PRINT_ERROR("Invalid file mode 0x%x", inode->i_mode);
res = -EINVAL;
goto out_skip;
}
file_size = inode->i_size;
buf = vmalloc(file_size);
if (buf == NULL) {
res = -ENOMEM;
PRINT_ERROR("%s", "Unable to allocate temporary buffer");
goto out_skip;
}
pos = 0;
res = kernel_read(file_src, buf, file_size, &pos);
if (res != file_size) {
PRINT_ERROR("Unable to read file '%s' - error %d", src, res);
goto out_skip;
}
pos = 0;
res = kernel_write(file_dest, buf, file_size, &pos);
if (res != file_size) {
PRINT_ERROR("Unable to write to '%s' - error %d", dest, res);
goto out_skip;
}
res = vfs_fsync(file_dest, 0);
if (res != 0) {
PRINT_ERROR("fsync() of the backup PR file failed: %d", res);
goto out_skip;
}
out_skip:
filp_close(file_dest, NULL);
out_close:
filp_close(file_src, NULL);
out_free:
if (buf != NULL)
vfree(buf);
out:
TRACE_EXIT_RES(res);
return res;
}
int scst_remove_file(const char *name)
{
int res = 0;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 28)
struct nameidata nd;
#else
struct path path;
#endif
TRACE_ENTRY();
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 28)
res = path_lookup(name, 0, &nd);
if (!res)
scst_vfs_unlink_and_put_nd(&nd);
else
TRACE_DBG("Unable to lookup file '%s' - error %d", name, res);
#else
res = kern_path(name, 0, &path);
if (!res)
scst_vfs_unlink_and_put(&path);
else
TRACE_DBG("Unable to lookup file '%s' - error %d", name, res);
#endif
TRACE_EXIT_RES(res);
return res;
}
EXPORT_SYMBOL_GPL(scst_remove_file);
/* Returns 0 on success, error code otherwise */
int scst_write_file_transactional(const char *name, const char *name1,
const char *signature, int signature_len, const uint8_t *buf, int size)
{
int res;
struct file *file;
loff_t pos = 0;
char n = '\n';
TRACE_ENTRY();
res = scst_copy_file(name, name1);
if ((res != 0) && (res != -ENOENT))
goto out;
file = filp_open(name, O_WRONLY | O_CREAT | O_TRUNC, 0644);
if (IS_ERR(file)) {
res = PTR_ERR(file);
PRINT_ERROR("Unable to (re)create file '%s' - error %d",
name, res);
goto out_set_fs;
}
TRACE_DBG("Writing file '%s'", name);
pos = signature_len+1;
res = kernel_write(file, buf, size, &pos);
if (res != size)
goto write_error;
res = vfs_fsync(file, 1);
if (res != 0) {
PRINT_ERROR("fsync() of file %s failed: %d", name, res);
goto write_error_close;
}
pos = 0;
res = kernel_write(file, signature, signature_len, &pos);
if (res != signature_len)
goto write_error;
res = kernel_write(file, &n, sizeof(n), &pos);
if (res != sizeof(n))
goto write_error;
res = vfs_fsync(file, 1);
if (res != 0) {
PRINT_ERROR("fsync() of file %s failed: %d", name, res);
goto write_error_close;
}
res = 0;
filp_close(file, NULL);
out_set_fs:
if (res == 0)
scst_remove_file(name1);
else
scst_remove_file(name);
out:
TRACE_EXIT_RES(res);
return res;
write_error:
PRINT_ERROR("Error writing to '%s' - error %d", name, res);
write_error_close:
filp_close(file, NULL);
if (res > 0)
res = -EIO;
goto out_set_fs;
}
EXPORT_SYMBOL_GPL(scst_write_file_transactional);
static int __scst_read_file_transactional(const char *file_name,
const char *signature, int signature_len, uint8_t *buf, int size)
{
int res;
struct file *file = NULL;
struct inode *inode;
loff_t file_size, pos;
TRACE_ENTRY();
TRACE_DBG("Loading file '%s'", file_name);
file = filp_open(file_name, O_RDONLY, 0);
if (IS_ERR(file)) {
res = PTR_ERR(file);
TRACE_DBG("Unable to open file '%s' - error %d", file_name, res);
goto out;
}
inode = file_inode(file);
if (S_ISREG(inode->i_mode)) {
/* Nothing to do */
} else if (S_ISBLK(inode->i_mode)) {
inode = inode->i_bdev->bd_inode;
} else {
PRINT_ERROR("Invalid file mode 0x%x", inode->i_mode);
res = -EINVAL;
goto out_close;
}
file_size = inode->i_size;
if (file_size > size) {
PRINT_ERROR("Supplied buffer (%d) too small (need %d)", size,
(int)file_size);
res = -EOVERFLOW;
goto out_close;
}
pos = 0;
res = kernel_read(file, buf, file_size, &pos);
if (res != file_size) {
PRINT_ERROR("Unable to read file '%s' - error %d", file_name, res);
if (res > 0)
res = -EIO;
goto out_close;
}
if (memcmp(buf, signature, signature_len) != 0) {
res = -EINVAL;
PRINT_ERROR("Invalid signature in file %s", file_name);
goto out_close;
}
out_close:
filp_close(file, NULL);
out:
TRACE_EXIT_RES(res);
return res;
}
/*
* Returns read data size on success, error code otherwise. The first
* signature_len+1 bytes of the read data contain signature, so should be
* skipped.
*/
int scst_read_file_transactional(const char *name, const char *name1,
const char *signature, int signature_len, uint8_t *buf, int size)
{
int res;
TRACE_ENTRY();
res = __scst_read_file_transactional(name, signature, signature_len, buf, size);
if (res <= 0)
res = __scst_read_file_transactional(name1, signature,
signature_len, buf, size);
if (res > 0)
TRACE_BUFFER("Read data", buf, res);
TRACE_EXIT_RES(res);
return res;
}
EXPORT_SYMBOL_GPL(scst_read_file_transactional);
/*
* Return the file mode if @path exists or an error code if opening @path via
* filp_open() in read-only mode failed.
*/
int scst_get_file_mode(const char *path)
{
struct file *file;
int res;
file = filp_open(path, O_RDONLY, 0400);
if (IS_ERR(file)) {
res = PTR_ERR(file);
goto out;
}
res = file_inode(file)->i_mode;
filp_close(file, NULL);
out:
return res;
}
EXPORT_SYMBOL(scst_get_file_mode);
/*
* Return true if either @path does not contain a slash or if the directory
* specified in @path exists.
*/
bool scst_parent_dir_exists(const char *path)
{
const char *last_slash = strrchr(path, '/');
const char *dir;
int dir_mode;
bool res = true;
if (last_slash && last_slash > path) {
dir = kasprintf(GFP_KERNEL, "%.*s", (int)(last_slash - path),
path);
if (dir) {
dir_mode = scst_get_file_mode(dir);
kfree(dir);
res = dir_mode >= 0 && S_ISDIR(dir_mode);
} else {
res = false;
}
}
return res;
}
EXPORT_SYMBOL(scst_parent_dir_exists);
static void __init scst_scsi_op_list_init(void)
{
int i;
uint8_t op = 0xff;
TRACE_ENTRY();
TRACE_DBG("tblsize=%zd", SCST_CDB_TBL_SIZE);
for (i = 0; i < 256; i++)
scst_scsi_op_list[i] = SCST_CDB_TBL_SIZE;
for (i = 0; i < SCST_CDB_TBL_SIZE; i++) {
if (scst_scsi_op_table[i].ops != op) {
op = scst_scsi_op_table[i].ops;
scst_scsi_op_list[op] = i;
}
}
TRACE_BUFFER("scst_scsi_op_list", scst_scsi_op_list,
sizeof(scst_scsi_op_list));
scst_release_acg_wq = create_workqueue("scst_release_acg");
WARN_ON_ONCE(IS_ERR(scst_release_acg_wq));
TRACE_EXIT();
return;
}
int __init scst_lib_init(void)
{
int res = 0;
scst_scsi_op_list_init();
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30)
scsi_io_context_cache = kmem_cache_create("scst_scsi_io_context",
sizeof(struct scsi_io_context),
__alignof__(struct scsi_io_context),
SCST_SLAB_FLAGS|SLAB_HWCACHE_ALIGN, NULL);
if (!scsi_io_context_cache) {
PRINT_ERROR("%s", "Can't init scsi io context cache");
res = -ENOMEM;
goto out;
}
out:
#endif
TRACE_EXIT_RES(res);
return res;
}
void scst_lib_exit(void)
{
/* Wait until any ongoing acg->put_work has finished. */
flush_workqueue(scst_release_acg_wq);
destroy_workqueue(scst_release_acg_wq);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30)
BUILD_BUG_ON(SCST_MAX_CDB_SIZE != BLK_MAX_CDB);
BUILD_BUG_ON(SCST_SENSE_BUFFERSIZE < SCSI_SENSE_BUFFERSIZE);
kmem_cache_destroy(scsi_io_context_cache);
#endif
}
#ifdef CONFIG_SCST_DEBUG
/**
* scst_random() - return a pseudo-random number for debugging purposes.
*
* Returns a pseudo-random number for debugging purposes. Available only in
* the DEBUG build.
*
* Original taken from the XFS code
*/
unsigned long scst_random(void)
{
static int Inited;
static unsigned long RandomValue;
static DEFINE_SPINLOCK(lock);
/* cycles pseudo-randomly through all values between 1 and 2^31 - 2 */
register long rv;
register long lo;
register long hi;
unsigned long flags;
spin_lock_irqsave(&lock, flags);
if (!Inited) {
RandomValue = jiffies;
Inited = 1;
}
rv = RandomValue;
hi = rv / 127773;
lo = rv % 127773;
rv = 16807 * lo - 2836 * hi;
if (rv <= 0)
rv += 2147483647;
RandomValue = rv;
spin_unlock_irqrestore(&lock, flags);
return rv;
}
EXPORT_SYMBOL_GPL(scst_random);
#endif /* CONFIG_SCST_DEBUG */
#ifdef CONFIG_SCST_DEBUG_TM
#define TM_DBG_STATE_ABORT 0
#define TM_DBG_STATE_RESET 1
#define TM_DBG_STATE_OFFLINE 2
#define INIT_TM_DBG_STATE TM_DBG_STATE_ABORT
static void tm_dbg_timer_fn(struct timer_list *timer);
static DEFINE_SPINLOCK(scst_tm_dbg_lock);
/* All serialized by scst_tm_dbg_lock */
static struct {
unsigned int tm_dbg_release:1;
unsigned int tm_dbg_blocked:1;
} tm_dbg_flags;
static LIST_HEAD(tm_dbg_delayed_cmd_list);
static int tm_dbg_delayed_cmds_count;
static int tm_dbg_passed_cmds_count;
static int tm_dbg_state;
static int tm_dbg_on_state_passes;
static DEFINE_TIMER(tm_dbg_timer, tm_dbg_timer_fn);
static struct scst_tgt_dev *tm_dbg_tgt_dev;
static const int tm_dbg_on_state_num_passes[] = { 5, 1, 0x7ffffff };
static void tm_dbg_init_tgt_dev(struct scst_tgt_dev *tgt_dev)
{
if (tgt_dev->lun == 15) {
unsigned long flags;
if (tm_dbg_tgt_dev != NULL)
tm_dbg_deinit_tgt_dev(tm_dbg_tgt_dev);
spin_lock_irqsave(&scst_tm_dbg_lock, flags);
tm_dbg_state = INIT_TM_DBG_STATE;
tm_dbg_on_state_passes =
tm_dbg_on_state_num_passes[tm_dbg_state];
tm_dbg_tgt_dev = tgt_dev;
PRINT_INFO("LUN %lld connected from initiator %s is under "
"TM debugging (tgt_dev %p)",
(unsigned long long)tgt_dev->lun,
tgt_dev->sess->initiator_name, tgt_dev);
spin_unlock_irqrestore(&scst_tm_dbg_lock, flags);
}
return;
}
static void tm_dbg_deinit_tgt_dev(struct scst_tgt_dev *tgt_dev)
{
if (tm_dbg_tgt_dev == tgt_dev) {
unsigned long flags;
TRACE_MGMT_DBG("Deinit TM debugging tgt_dev %p", tgt_dev);
del_timer_sync(&tm_dbg_timer);
spin_lock_irqsave(&scst_tm_dbg_lock, flags);
tm_dbg_tgt_dev = NULL;
spin_unlock_irqrestore(&scst_tm_dbg_lock, flags);
}
return;
}
static void tm_dbg_timer_fn(struct timer_list *timer)
{
TRACE_MGMT_DBG("%s", "delayed cmd timer expired");
tm_dbg_flags.tm_dbg_release = 1;
wake_up_all(&tm_dbg_tgt_dev->active_cmd_threads->cmd_list_waitQ);
return;
}
/* Called under scst_tm_dbg_lock and IRQs off */
static void tm_dbg_delay_cmd(struct scst_cmd *cmd)
{
switch (tm_dbg_state) {
case TM_DBG_STATE_ABORT:
if (tm_dbg_delayed_cmds_count == 0) {
unsigned long d = 58*HZ + (scst_random() % (4*HZ));
TRACE_MGMT_DBG("STATE ABORT: delaying cmd %p (tag %llu)"
" for %ld.%ld seconds (%ld HZ), "
"tm_dbg_on_state_passes=%d", cmd, cmd->tag,
d/HZ, (d%HZ)*100/HZ, d, tm_dbg_on_state_passes);
mod_timer(&tm_dbg_timer, jiffies + d);
#if 0
tm_dbg_flags.tm_dbg_blocked = 1;
#endif
} else {
TRACE_MGMT_DBG("Delaying another timed cmd %p "
"(tag %llu), delayed_cmds_count=%d, "
"tm_dbg_on_state_passes=%d", cmd, cmd->tag,
tm_dbg_delayed_cmds_count,
tm_dbg_on_state_passes);
if (tm_dbg_delayed_cmds_count == 2)
tm_dbg_flags.tm_dbg_blocked = 0;
}
break;
case TM_DBG_STATE_RESET:
case TM_DBG_STATE_OFFLINE:
TRACE_MGMT_DBG("STATE RESET/OFFLINE: delaying cmd %p "
"(tag %llu), delayed_cmds_count=%d, "
"tm_dbg_on_state_passes=%d", cmd, cmd->tag,
tm_dbg_delayed_cmds_count, tm_dbg_on_state_passes);
tm_dbg_flags.tm_dbg_blocked = 1;
break;
default:
sBUG();
}
/* IRQs already off */
spin_lock(&cmd->cmd_threads->cmd_list_lock);
list_add_tail(&cmd->cmd_list_entry, &tm_dbg_delayed_cmd_list);
spin_unlock(&cmd->cmd_threads->cmd_list_lock);
cmd->tm_dbg_delayed = 1;
tm_dbg_delayed_cmds_count++;
return;
}
/* No locks */
void tm_dbg_check_released_cmds(void)
{
if (tm_dbg_flags.tm_dbg_release) {
struct scst_cmd *cmd, *tc;
spin_lock_irq(&scst_tm_dbg_lock);
list_for_each_entry_safe_reverse(cmd, tc,
&tm_dbg_delayed_cmd_list, cmd_list_entry) {
TRACE_MGMT_DBG("Releasing timed cmd %p (tag %llu), "
"delayed_cmds_count=%d", cmd, cmd->tag,
tm_dbg_delayed_cmds_count);
spin_lock(&cmd->cmd_threads->cmd_list_lock);
list_move(&cmd->cmd_list_entry,
&cmd->cmd_threads->active_cmd_list);
spin_unlock(&cmd->cmd_threads->cmd_list_lock);
}
tm_dbg_flags.tm_dbg_release = 0;
spin_unlock_irq(&scst_tm_dbg_lock);
}
}
/* Called under scst_tm_dbg_lock, but can drop it inside, then reget */
static void tm_dbg_change_state(unsigned long *flags)
{
tm_dbg_flags.tm_dbg_blocked = 0;
if (--tm_dbg_on_state_passes == 0) {
switch (tm_dbg_state) {
case TM_DBG_STATE_ABORT:
TRACE_MGMT_DBG("%s", "Changing "
"tm_dbg_state to RESET");
tm_dbg_state = TM_DBG_STATE_RESET;
tm_dbg_flags.tm_dbg_blocked = 0;
break;
case TM_DBG_STATE_RESET:
case TM_DBG_STATE_OFFLINE:
#ifdef CONFIG_SCST_TM_DBG_GO_OFFLINE
TRACE_MGMT_DBG("%s", "Changing "
"tm_dbg_state to OFFLINE");
tm_dbg_state = TM_DBG_STATE_OFFLINE;
#else
TRACE_MGMT_DBG("%s", "Changing "
"tm_dbg_state to ABORT");
tm_dbg_state = TM_DBG_STATE_ABORT;
#endif
break;
default:
sBUG();
}
tm_dbg_on_state_passes =
tm_dbg_on_state_num_passes[tm_dbg_state];
}
TRACE_MGMT_DBG("%s", "Deleting timer");
spin_unlock_irqrestore(&scst_tm_dbg_lock, *flags);
del_timer_sync(&tm_dbg_timer);
spin_lock_irqsave(&scst_tm_dbg_lock, *flags);
return;
}
/* No locks */
int tm_dbg_check_cmd(struct scst_cmd *cmd)
{
int res = 0;
unsigned long flags;
if (cmd->tm_dbg_immut)
goto out;
if (cmd->tm_dbg_delayed) {
spin_lock_irqsave(&scst_tm_dbg_lock, flags);
TRACE_MGMT_DBG("Processing delayed cmd %p (tag %llu), "
"delayed_cmds_count=%d", cmd, cmd->tag,
tm_dbg_delayed_cmds_count);
cmd->tm_dbg_immut = 1;
tm_dbg_delayed_cmds_count--;
if ((tm_dbg_delayed_cmds_count == 0) &&
(tm_dbg_state == TM_DBG_STATE_ABORT))
tm_dbg_change_state(&flags);
spin_unlock_irqrestore(&scst_tm_dbg_lock, flags);
} else if (cmd->tgt_dev && (tm_dbg_tgt_dev == cmd->tgt_dev)) {
/* Delay 5000th command */
spin_lock_irqsave(&scst_tm_dbg_lock, flags);
if (tm_dbg_flags.tm_dbg_blocked ||
(++tm_dbg_passed_cmds_count % 5000) == 0) {
tm_dbg_delay_cmd(cmd);
res = 1;
} else
cmd->tm_dbg_immut = 1;
spin_unlock_irqrestore(&scst_tm_dbg_lock, flags);
}
out:
return res;
}
/* No locks */
void tm_dbg_release_cmd(struct scst_cmd *cmd)
{
struct scst_cmd *c;
unsigned long flags;
spin_lock_irqsave(&scst_tm_dbg_lock, flags);
list_for_each_entry(c, &tm_dbg_delayed_cmd_list,
cmd_list_entry) {
if (c == cmd) {
TRACE_MGMT_DBG("Abort request for "
"delayed cmd %p (tag=%llu), moving it to "
"active cmd list (delayed_cmds_count=%d)",
c, c->tag, tm_dbg_delayed_cmds_count);
if (!(in_atomic() || in_interrupt() || irqs_disabled()))
msleep(2000);
if (!test_bit(SCST_CMD_ABORTED_OTHER,
&cmd->cmd_flags)) {
/* Test how completed commands handled */
if (((scst_random() % 10) == 5)) {
scst_set_cmd_error(cmd,
SCST_LOAD_SENSE(
scst_sense_internal_failure));
/* It's completed now */
}
}
spin_lock(&cmd->cmd_threads->cmd_list_lock);
list_move(&c->cmd_list_entry,
&c->cmd_threads->active_cmd_list);
wake_up(&c->cmd_threads->cmd_list_waitQ);
spin_unlock(&cmd->cmd_threads->cmd_list_lock);
break;
}
}
spin_unlock_irqrestore(&scst_tm_dbg_lock, flags);
return;
}
/* Might be called under scst_mutex */
void tm_dbg_task_mgmt(struct scst_device *dev, const char *fn, int force)
{
unsigned long flags;
if (dev != NULL) {
if (tm_dbg_tgt_dev == NULL)
goto out;
if (tm_dbg_tgt_dev->dev != dev)
goto out;
}
spin_lock_irqsave(&scst_tm_dbg_lock, flags);
if ((tm_dbg_state != TM_DBG_STATE_OFFLINE) || force) {
TRACE_MGMT_DBG("%s: freeing %d delayed cmds", fn,
tm_dbg_delayed_cmds_count);
tm_dbg_change_state(&flags);
tm_dbg_flags.tm_dbg_release = 1;
/*
* Used to make sure that all woken up threads see the new
* value.
*/
smp_wmb();
if (tm_dbg_tgt_dev != NULL)
wake_up_all(&tm_dbg_tgt_dev->active_cmd_threads->cmd_list_waitQ);
} else {
TRACE_MGMT_DBG("%s: while OFFLINE state, doing nothing", fn);
}
spin_unlock_irqrestore(&scst_tm_dbg_lock, flags);
out:
return;
}
int tm_dbg_is_release(void)
{
return tm_dbg_flags.tm_dbg_release;
}
#endif /* CONFIG_SCST_DEBUG_TM */
#ifdef CONFIG_SCST_DEBUG_SN
void scst_check_debug_sn(struct scst_cmd *cmd)
{
int old = cmd->queue_type;
/* To simulate from time to time queue flushing */
if (!in_interrupt() && (scst_random() % 120) == 8) {
int t = scst_random() % 1200;
TRACE_SN("Delaying IO on %d ms", t);
msleep(t);
}
if ((scst_random() % 15) == 7)
cmd->queue_type = SCST_CMD_QUEUE_ORDERED;
else if ((scst_random() % 1000) == 751)
cmd->queue_type = SCST_CMD_QUEUE_HEAD_OF_QUEUE;
else if ((scst_random() % 1000) == 752)
cmd->queue_type = SCST_CMD_QUEUE_SIMPLE;
if (old != cmd->queue_type)
TRACE_SN("DbgSN queue type changed for cmd %p from %d to %d",
cmd, old, cmd->queue_type);
return;
}
#endif /* CONFIG_SCST_DEBUG_SN */
static void __scst_update_latency_stats(struct scst_cmd *cmd,
struct scst_lat_stat_entry *stat,
const ktime_t now, uint64_t nowc)
{
uint64_t delta;
#ifdef SCST_MEASURE_CLOCK_CYCLES
int64_t deltac;
#endif
if (stat && ktime_to_ns(cmd->last_state_update) != 0) {
delta = ktime_to_ns(ktime_sub(now, cmd->last_state_update));
if (delta > NSEC_PER_SEC) {
printk_once(KERN_INFO "%d: ignoring large time delta %lld\n",
cmd->state, delta);
delta = 0;
}
do_div(delta, 100);
#ifdef SCST_MEASURE_CLOCK_CYCLES
deltac = nowc - cmd->last_state_update_tsc;
if (deltac < 0 || deltac > tsc_khz * 1000) {
printk_once(KERN_INFO "%d: ignoring large cc delta %lld\n",
cmd->state, deltac);
deltac = 0;
}
do_div(deltac, 100);
#endif
if (stat->count++ > 0) {
if (delta < stat->min)
stat->min = delta;
if (delta > stat->max)
stat->max = delta;
#ifdef SCST_MEASURE_CLOCK_CYCLES
if (deltac < stat->minc)
stat->minc = deltac;
if (deltac > stat->maxc)
stat->maxc = deltac;
#endif
} else {
stat->min = stat->max = delta;
#ifdef SCST_MEASURE_CLOCK_CYCLES
stat->minc = stat->maxc = deltac;
#endif
}
stat->sum += delta;
stat->sumsq += delta * delta;
#ifdef SCST_MEASURE_CLOCK_CYCLES
stat->sumc += deltac;
stat->sumsqc += deltac * deltac;
#endif
}
cmd->last_state_update = now;
#ifdef SCST_MEASURE_CLOCK_CYCLES
cmd->last_state_update_tsc = nowc;
#endif
}
/*
* Note: in the code below it has been assumed that expected_data_direction
* and expected_transfer_len_full have been set before scst_cmd_init_done()
* has been called and that these are not changed later on.
*/
void scst_update_latency_stats(struct scst_cmd *cmd, int new_state)
{
ktime_t now;
uint64_t nowc;
int sz, dir;
struct scst_lat_stat_entry *stat;
unsigned long flags;
sBUG_ON(new_state >= SCST_CMD_STATE_COUNT);
now = ktime_get();
#ifdef SCST_MEASURE_CLOCK_CYCLES
nowc = rdtsc();
#else
nowc = 0;
#endif
/*
* expected_transfer_len_full is only available once the state
* SCST_CMD_STATE_INIT has been reached.
*/
if (new_state == SCST_CMD_STATE_INIT_WAIT) {
cmd->init_wait_time = now;
#ifdef SCST_MEASURE_CLOCK_CYCLES
cmd->init_wait_tsc = nowc;
#endif
return;
}
WARN_ON_ONCE(!cmd->sess);
if (!cmd->sess->lat_stats)
return;
/* To do: subtract size of T10 PI data from data length */
sz = ilog2(roundup_pow_of_two(cmd->expected_transfer_len_full)) -
SCST_STATS_LOG2_SZ_OFFSET;
if (sz < 0)
sz = 0;
else if (sz >= SCST_STATS_MAX_LOG2_SZ)
sz = SCST_STATS_MAX_LOG2_SZ - 1;
dir = cmd->expected_data_direction & 3;
stat = &cmd->sess->lat_stats->ls[sz][dir][cmd->state];
spin_lock_irqsave(&cmd->sess->lat_stats_lock, flags);
if (new_state == SCST_CMD_STATE_INIT)
__scst_update_latency_stats(cmd, NULL,
cmd->init_wait_time,
cmd->init_wait_tsc);
__scst_update_latency_stats(cmd, stat, now, nowc);
spin_unlock_irqrestore(&cmd->sess->lat_stats_lock, flags);
}