| /* A utility program for the Linux OS SCSI generic ("sg") device driver. |
| * Copyright (C) 2001 - 2016 D. Gilbert |
| * 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; either version 2, or (at your option) |
| * any later version. |
| |
| This program reads data from the given SCSI device (typically a disk |
| or cdrom) and discards that data. Its primary goal is to time |
| multiple reads all starting from the same logical address. Its interface |
| is a subset of another member of this package: sg_dd which is a |
| "dd" variant. The input file can be a scsi generic device, a block device, |
| a raw device or a seekable file. Streams such as stdin are not acceptable. |
| The block size ('bs') is assumed to be 512 if not given. |
| |
| This version should compile with Linux sg drivers with version numbers |
| >= 30000 . For mmap-ed IO the sg version number >= 30122 . |
| |
| */ |
| |
| #define _XOPEN_SOURCE 500 |
| #ifndef _GNU_SOURCE |
| #define _GNU_SOURCE 1 |
| #endif |
| |
| #include <unistd.h> |
| #include <fcntl.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <signal.h> |
| #include <ctype.h> |
| #include <errno.h> |
| #define __STDC_FORMAT_MACROS 1 |
| #include <inttypes.h> |
| #include <sys/ioctl.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <sys/sysmacros.h> |
| #include <sys/mman.h> |
| #include <sys/time.h> |
| #include <linux/major.h> |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| #include "sg_lib.h" |
| #include "sg_io_linux.h" |
| #include "sg_unaligned.h" |
| #include "sg_pr2serr.h" |
| |
| |
| static const char * version_str = "1.25 20160121"; |
| |
| #define DEF_BLOCK_SIZE 512 |
| #define DEF_BLOCKS_PER_TRANSFER 128 |
| #define DEF_SCSI_CDBSZ 10 |
| #define MAX_SCSI_CDBSZ 16 |
| |
| #define ME "sg_read: " |
| |
| #ifndef SG_FLAG_MMAP_IO |
| #define SG_FLAG_MMAP_IO 4 |
| #endif |
| |
| #define SENSE_BUFF_LEN 64 /* Arbitrary, could be larger */ |
| #define DEF_TIMEOUT 40000 /* 40,000 millisecs == 40 seconds */ |
| |
| #ifndef RAW_MAJOR |
| #define RAW_MAJOR 255 /*unlikey value */ |
| #endif |
| |
| #define FT_OTHER 1 /* filetype other than sg or raw device */ |
| #define FT_SG 2 /* filetype is sg char device */ |
| #define FT_RAW 4 /* filetype is raw char device */ |
| #define FT_BLOCK 8 /* filetype is block device */ |
| #define FT_ERROR 64 /* couldn't "stat" file */ |
| |
| #define MIN_RESERVED_SIZE 8192 |
| |
| static int sum_of_resids = 0; |
| |
| static int64_t dd_count = -1; |
| static int64_t orig_count = 0; |
| static int64_t in_full = 0; |
| static int in_partial = 0; |
| |
| static int pack_id_count = 0; |
| static int verbose = 0; |
| |
| static const char * proc_allow_dio = "/proc/scsi/sg/allow_dio"; |
| |
| static void install_handler (int sig_num, void (*sig_handler) (int sig)) |
| { |
| struct sigaction sigact; |
| |
| sigaction (sig_num, NULL, &sigact); |
| if (sigact.sa_handler != SIG_IGN) { |
| sigact.sa_handler = sig_handler; |
| sigemptyset (&sigact.sa_mask); |
| sigact.sa_flags = 0; |
| sigaction (sig_num, &sigact, NULL); |
| } |
| } |
| |
| static void print_stats(int iters, const char * str) |
| { |
| if (orig_count > 0) { |
| if (0 != dd_count) |
| pr2serr(" remaining block count=%" PRId64 "\n", dd_count); |
| pr2serr("%" PRId64 "+%d records in", in_full - in_partial, |
| in_partial); |
| if (iters > 0) |
| pr2serr(", %s commands issued: %d\n", (str ? str : ""), iters); |
| else |
| pr2serr("\n"); |
| } else if (iters > 0) |
| pr2serr("%s commands issued: %d\n", (str ? str : ""), iters); |
| } |
| |
| static void interrupt_handler(int sig) |
| { |
| struct sigaction sigact; |
| |
| sigact.sa_handler = SIG_DFL; |
| sigemptyset (&sigact.sa_mask); |
| sigact.sa_flags = 0; |
| sigaction (sig, &sigact, NULL); |
| pr2serr("Interrupted by signal,"); |
| print_stats(0, NULL); |
| kill (getpid (), sig); |
| } |
| |
| static void siginfo_handler(int sig) |
| { |
| if (sig) { ; } /* unused, dummy to suppress warning */ |
| pr2serr("Progress report, continuing ...\n"); |
| print_stats(0, NULL); |
| } |
| |
| static int dd_filetype(const char * filename) |
| { |
| struct stat st; |
| |
| if (stat(filename, &st) < 0) |
| return FT_ERROR; |
| if (S_ISCHR(st.st_mode)) { |
| if (RAW_MAJOR == major(st.st_rdev)) |
| return FT_RAW; |
| else if (SCSI_GENERIC_MAJOR == major(st.st_rdev)) |
| return FT_SG; |
| } else if (S_ISBLK(st.st_mode)) |
| return FT_BLOCK; |
| return FT_OTHER; |
| } |
| |
| static void usage() |
| { |
| pr2serr("Usage: sg_read [blk_sgio=0|1] [bpt=BPT] [bs=BS] " |
| "[cdbsz=6|10|12|16]\n" |
| " count=COUNT [dio=0|1] [dpo=0|1] [fua=0|1] " |
| "if=IFILE\n" |
| " [mmap=0|1] [no_dfxer=0|1] [odir=0|1] " |
| "[skip=SKIP]\n" |
| " [time=TI] [verbose=VERB] [--help] " |
| "[--version]\n" |
| " where:\n" |
| " blk_sgio 0->normal IO for block devices, 1->SCSI commands " |
| "via SG_IO\n" |
| " bpt is blocks_per_transfer (default is 128, or 64 KiB " |
| "for default BS)\n" |
| " setting 'bpt=0' will do COUNT zero block SCSI " |
| "READs\n" |
| " bs must match sector size if IFILE accessed via SCSI " |
| "commands\n" |
| " (def=512)\n" |
| " cdbsz size of SCSI READ command (default is 10)\n" |
| " count total bytes read will be BS*COUNT (if no " |
| "error)\n" |
| " (if negative, do |COUNT| zero block SCSI READs)\n" |
| " dio 1-> attempt direct IO on sg device, 0->indirect IO " |
| "(def)\n"); |
| pr2serr(" dpo 1-> set disable page out (DPO) in SCSI READs\n" |
| " fua 1-> set force unit access (FUA) in SCSI READs\n" |
| " if an sg, block or raw device, or a seekable file (not " |
| "stdin)\n" |
| " mmap 1->perform mmaped IO on sg device, 0->indirect IO " |
| "(def)\n" |
| " no_dxfer 1->DMA to kernel buffers only, not user space, " |
| "0->normal(def)\n" |
| " odir 1->open block device O_DIRECT, 0->don't (def)\n" |
| " skip each transfer starts at this logical address " |
| "(def=0)\n" |
| " time 0->do nothing(def), 1->time from 1st cmd, 2->time " |
| "from 2nd, ...\n" |
| " verbose increase level of verbosity (def: 0)\n" |
| " --help print this usage message then exit\n" |
| " --version print version number then exit\n\n" |
| "Issue SCSI READ commands, each starting from the same logical " |
| "block address\n"); |
| } |
| |
| static int sg_build_scsi_cdb(unsigned char * cdbp, int cdb_sz, |
| unsigned int blocks, int64_t start_block, |
| int write_true, int fua, int dpo) |
| { |
| int rd_opcode[] = {0x8, 0x28, 0xa8, 0x88}; |
| int wr_opcode[] = {0xa, 0x2a, 0xaa, 0x8a}; |
| int sz_ind; |
| |
| memset(cdbp, 0, cdb_sz); |
| if (dpo) |
| cdbp[1] |= 0x10; |
| if (fua) |
| cdbp[1] |= 0x8; |
| switch (cdb_sz) { |
| case 6: |
| sz_ind = 0; |
| cdbp[0] = (unsigned char)(write_true ? wr_opcode[sz_ind] : |
| rd_opcode[sz_ind]); |
| sg_put_unaligned_be24(0x1fffff & start_block, cdbp + 1); |
| cdbp[4] = (256 == blocks) ? 0 : (unsigned char)blocks; |
| if (blocks > 256) { |
| pr2serr(ME "for 6 byte commands, maximum number of blocks is " |
| "256\n"); |
| return 1; |
| } |
| if ((start_block + blocks - 1) & (~0x1fffff)) { |
| pr2serr(ME "for 6 byte commands, can't address blocks beyond " |
| "%d\n", 0x1fffff); |
| return 1; |
| } |
| if (dpo || fua) { |
| pr2serr(ME "for 6 byte commands, neither dpo nor fua bits " |
| "supported\n"); |
| return 1; |
| } |
| break; |
| case 10: |
| sz_ind = 1; |
| cdbp[0] = (unsigned char)(write_true ? wr_opcode[sz_ind] : |
| rd_opcode[sz_ind]); |
| sg_put_unaligned_be32((uint32_t)start_block, cdbp + 2); |
| sg_put_unaligned_be16((uint16_t)blocks, cdbp + 7); |
| if (blocks & (~0xffff)) { |
| pr2serr(ME "for 10 byte commands, maximum number of blocks is " |
| "%d\n", 0xffff); |
| return 1; |
| } |
| break; |
| case 12: |
| sz_ind = 2; |
| cdbp[0] = (unsigned char)(write_true ? wr_opcode[sz_ind] : |
| rd_opcode[sz_ind]); |
| sg_put_unaligned_be32((uint32_t)start_block, cdbp + 2); |
| sg_put_unaligned_be32((uint32_t)blocks, cdbp + 6); |
| break; |
| case 16: |
| sz_ind = 3; |
| cdbp[0] = (unsigned char)(write_true ? wr_opcode[sz_ind] : |
| rd_opcode[sz_ind]); |
| sg_put_unaligned_be64(start_block, cdbp + 2); |
| sg_put_unaligned_be32((uint32_t)blocks, cdbp + 10); |
| break; |
| default: |
| pr2serr(ME "expected cdb size of 6, 10, 12, or 16 but got %d\n", |
| cdb_sz); |
| return 1; |
| } |
| return 0; |
| } |
| |
| /* -3 medium/hardware error, -2 -> not ready, 0 -> successful, |
| 1 -> recoverable (ENOMEM), 2 -> try again (e.g. unit attention), |
| 3 -> try again (e.g. aborted command), -1 -> other unrecoverable error */ |
| static int sg_bread(int sg_fd, unsigned char * buff, int blocks, |
| int64_t from_block, int bs, int cdbsz, |
| int fua, int dpo, int * diop, int do_mmap, |
| int no_dxfer) |
| { |
| int k; |
| unsigned char rdCmd[MAX_SCSI_CDBSZ]; |
| unsigned char senseBuff[SENSE_BUFF_LEN]; |
| struct sg_io_hdr io_hdr; |
| |
| if (sg_build_scsi_cdb(rdCmd, cdbsz, blocks, from_block, 0, fua, dpo)) { |
| pr2serr(ME "bad cdb build, from_block=%" PRId64 ", blocks=%d\n", |
| from_block, blocks); |
| return -1; |
| } |
| memset(&io_hdr, 0, sizeof(struct sg_io_hdr)); |
| io_hdr.interface_id = 'S'; |
| io_hdr.cmd_len = cdbsz; |
| io_hdr.cmdp = rdCmd; |
| if (blocks > 0) { |
| io_hdr.dxfer_direction = SG_DXFER_FROM_DEV; |
| io_hdr.dxfer_len = bs * blocks; |
| /* next: shows dxferp unused during mmap-ed IO */ |
| if (! do_mmap) |
| io_hdr.dxferp = buff; |
| if (diop && *diop) |
| io_hdr.flags |= SG_FLAG_DIRECT_IO; |
| else if (do_mmap) |
| io_hdr.flags |= SG_FLAG_MMAP_IO; |
| else if (no_dxfer) |
| io_hdr.flags |= SG_FLAG_NO_DXFER; |
| } else |
| io_hdr.dxfer_direction = SG_DXFER_NONE; |
| io_hdr.mx_sb_len = SENSE_BUFF_LEN; |
| io_hdr.sbp = senseBuff; |
| io_hdr.timeout = DEF_TIMEOUT; |
| io_hdr.pack_id = pack_id_count++; |
| if (verbose > 1) { |
| pr2serr( " read cdb: "); |
| for (k = 0; k < cdbsz; ++k) |
| pr2serr( "%02x ", rdCmd[k]); |
| pr2serr( "\n"); |
| } |
| |
| if (ioctl(sg_fd, SG_IO, &io_hdr) < 0) { |
| if (ENOMEM == errno) |
| return 1; |
| perror("reading (SG_IO) on sg device, error"); |
| return -1; |
| } |
| |
| if (verbose > 2) |
| pr2serr( " duration=%u ms\n", io_hdr.duration); |
| switch (sg_err_category3(&io_hdr)) { |
| case SG_LIB_CAT_CLEAN: |
| break; |
| case SG_LIB_CAT_RECOVERED: |
| if (verbose > 1) |
| sg_chk_n_print3("reading, continue", &io_hdr, 1); |
| break; |
| case SG_LIB_CAT_UNIT_ATTENTION: |
| if (verbose) |
| sg_chk_n_print3("reading", &io_hdr, verbose - 1); |
| return 2; |
| case SG_LIB_CAT_ABORTED_COMMAND: |
| if (verbose) |
| sg_chk_n_print3("reading", &io_hdr, verbose - 1); |
| return 3; |
| case SG_LIB_CAT_NOT_READY: |
| if (verbose) |
| sg_chk_n_print3("reading", &io_hdr, verbose - 1); |
| return -2; |
| case SG_LIB_CAT_MEDIUM_HARD: |
| if (verbose) |
| sg_chk_n_print3("reading", &io_hdr, verbose - 1); |
| return -3; |
| default: |
| sg_chk_n_print3("reading", &io_hdr, verbose); |
| return -1; |
| } |
| if (blocks > 0) { |
| if (diop && *diop && |
| ((io_hdr.info & SG_INFO_DIRECT_IO_MASK) != SG_INFO_DIRECT_IO)) |
| *diop = 0; /* flag that dio not done (completely) */ |
| sum_of_resids += io_hdr.resid; |
| } |
| return 0; |
| } |
| |
| #define STR_SZ 1024 |
| #define INF_SZ 512 |
| #define EBUFF_SZ 512 |
| |
| |
| int main(int argc, char * argv[]) |
| { |
| int64_t skip = 0; |
| int bs = 0; |
| int bpt = DEF_BLOCKS_PER_TRANSFER; |
| char str[STR_SZ]; |
| char * key; |
| char * buf; |
| char inf[INF_SZ]; |
| char outf[INF_SZ]; |
| int in_type = FT_OTHER; |
| int do_dio = 0; |
| int do_odir = 0; |
| int do_blk_sgio = 0; |
| int do_mmap = 0; |
| int no_dxfer = 0; |
| int do_time = 0; |
| int fua = 0; |
| int dpo = 0; |
| int scsi_cdbsz = DEF_SCSI_CDBSZ; |
| int dio_incomplete = 0; |
| int count_given = 0; |
| int res, k, t, buf_sz, dio_tmp, iters; |
| int infd, blocks, flags, blocks_per; |
| unsigned char * wrkBuff = NULL; |
| unsigned char * wrkPos = NULL; |
| char ebuff[EBUFF_SZ]; |
| struct timeval start_tm, end_tm; |
| const char * read_str; |
| int ret = 0; |
| size_t psz; |
| |
| #if defined(HAVE_SYSCONF) && defined(_SC_PAGESIZE) |
| psz = sysconf(_SC_PAGESIZE); /* POSIX.1 (was getpagesize()) */ |
| #else |
| psz = 4096; /* give up, pick likely figure */ |
| #endif |
| inf[0] = '\0'; |
| |
| for (k = 1; k < argc; k++) { |
| if (argv[k]) { |
| strncpy(str, argv[k], STR_SZ); |
| str[STR_SZ - 1] = '\0'; |
| } else |
| continue; |
| for (key = str, buf = key; (*buf && (*buf != '=')); ) |
| buf++; |
| if (*buf) |
| *buf++ = '\0'; |
| if (0 == strcmp(key,"blk_sgio")) |
| do_blk_sgio = sg_get_num(buf); |
| else if (0 == strcmp(key,"bpt")) { |
| bpt = sg_get_num(buf); |
| if (-1 == bpt) { |
| pr2serr( ME "bad argument to 'bpt'\n"); |
| return SG_LIB_SYNTAX_ERROR; |
| } |
| } else if (0 == strcmp(key,"bs")) { |
| bs = sg_get_num(buf); |
| if (-1 == bs) { |
| pr2serr( ME "bad argument to 'bs'\n"); |
| return SG_LIB_SYNTAX_ERROR; |
| } |
| } else if (0 == strcmp(key,"cdbsz")) |
| scsi_cdbsz = sg_get_num(buf); |
| else if (0 == strcmp(key,"count")) { |
| count_given = 1; |
| if ('-' == *buf) { |
| dd_count = sg_get_llnum(buf + 1); |
| if (-1 == dd_count) { |
| pr2serr( ME "bad argument to 'count'\n"); |
| return SG_LIB_SYNTAX_ERROR; |
| } |
| dd_count = - dd_count; |
| } else { |
| dd_count = sg_get_llnum(buf); |
| if (-1 == dd_count) { |
| pr2serr( ME "bad argument to 'count'\n"); |
| return SG_LIB_SYNTAX_ERROR; |
| } |
| } |
| } else if (0 == strcmp(key,"dio")) |
| do_dio = sg_get_num(buf); |
| else if (0 == strcmp(key,"dpo")) |
| dpo = sg_get_num(buf); |
| else if (0 == strcmp(key,"fua")) |
| fua = sg_get_num(buf); |
| else if (strcmp(key,"if") == 0) |
| strncpy(inf, buf, INF_SZ); |
| else if (0 == strcmp(key,"mmap")) |
| do_mmap = sg_get_num(buf); |
| else if (0 == strcmp(key,"no_dxfer")) |
| no_dxfer = sg_get_num(buf); |
| else if (0 == strcmp(key,"odir")) |
| do_odir = sg_get_num(buf); |
| else if (strcmp(key,"of") == 0) |
| strncpy(outf, buf, INF_SZ); |
| else if (0 == strcmp(key,"skip")) { |
| skip = sg_get_llnum(buf); |
| if (-1 == skip) { |
| pr2serr( ME "bad argument to 'skip'\n"); |
| return SG_LIB_SYNTAX_ERROR; |
| } |
| } else if (0 == strcmp(key,"time")) |
| do_time = sg_get_num(buf); |
| else if (0 == strncmp(key, "verb", 4)) |
| verbose = sg_get_num(buf); |
| else if (0 == strncmp(key, "--help", 6)) { |
| usage(); |
| return 0; |
| } else if (0 == strncmp(key, "--vers", 6)) { |
| pr2serr( ME ": %s\n", version_str); |
| return 0; |
| } else { |
| pr2serr( "Unrecognized argument '%s'\n", key); |
| usage(); |
| return SG_LIB_SYNTAX_ERROR; |
| } |
| } |
| if (bs <= 0) { |
| bs = DEF_BLOCK_SIZE; |
| if ((dd_count > 0) && (bpt > 0)) |
| pr2serr( "Assume default 'bs' (block size) of %d bytes\n", bs); |
| } |
| if (! count_given) { |
| pr2serr("'count' must be given\n"); |
| usage(); |
| return SG_LIB_SYNTAX_ERROR; |
| } |
| if (skip < 0) { |
| pr2serr("skip cannot be negative\n"); |
| return SG_LIB_SYNTAX_ERROR; |
| } |
| if (bpt < 1) { |
| if (0 == bpt) { |
| if (dd_count > 0) |
| dd_count = - dd_count; |
| } else { |
| pr2serr("bpt must be greater than 0\n"); |
| return SG_LIB_SYNTAX_ERROR; |
| } |
| } |
| if (do_dio && do_mmap) { |
| pr2serr("cannot select both dio and mmap\n"); |
| return SG_LIB_SYNTAX_ERROR; |
| } |
| if (no_dxfer && (do_dio || do_mmap)) { |
| pr2serr("cannot select no_dxfer with dio or mmap\n"); |
| return SG_LIB_SYNTAX_ERROR; |
| } |
| |
| install_handler (SIGINT, interrupt_handler); |
| install_handler (SIGQUIT, interrupt_handler); |
| install_handler (SIGPIPE, interrupt_handler); |
| install_handler (SIGUSR1, siginfo_handler); |
| |
| if (! inf[0]) { |
| pr2serr("must provide 'if=<filename>'\n"); |
| usage(); |
| return SG_LIB_SYNTAX_ERROR; |
| } |
| if (0 == strcmp("-", inf)) { |
| pr2serr("'-' (stdin) invalid as <filename>\n"); |
| usage(); |
| return SG_LIB_SYNTAX_ERROR; |
| } |
| in_type = dd_filetype(inf); |
| if (FT_ERROR == in_type) { |
| pr2serr("Unable to access: %s\n", inf); |
| return SG_LIB_FILE_ERROR; |
| } else if ((FT_BLOCK & in_type) && do_blk_sgio) |
| in_type |= FT_SG; |
| |
| if (FT_SG & in_type) { |
| if ((dd_count < 0) && (6 == scsi_cdbsz)) { |
| pr2serr(ME "SCSI READ (6) can't do zero block reads\n"); |
| return SG_LIB_SYNTAX_ERROR; |
| } |
| flags = O_RDWR; |
| if (do_odir) |
| flags |= O_DIRECT; |
| if ((infd = open(inf, flags)) < 0) { |
| flags = O_RDONLY; |
| if (do_odir) |
| flags |= O_DIRECT; |
| if ((infd = open(inf, flags)) < 0) { |
| snprintf(ebuff, EBUFF_SZ, |
| ME "could not open %s for sg reading", inf); |
| perror(ebuff); |
| return SG_LIB_FILE_ERROR; |
| } |
| } |
| if (verbose) |
| pr2serr("Opened %s for SG_IO with flags=0x%x\n", inf, flags); |
| if ((dd_count > 0) && (! (FT_BLOCK & in_type))) { |
| if (verbose > 2) { |
| if (ioctl(infd, SG_GET_RESERVED_SIZE, &t) >= 0) |
| pr2serr(" SG_GET_RESERVED_SIZE yields: %d\n", t); |
| } |
| t = bs * bpt; |
| if ((do_mmap) && (0 != (t % psz))) |
| t = ((t / psz) + 1) * psz; /* round up to next pagesize */ |
| res = ioctl(infd, SG_SET_RESERVED_SIZE, &t); |
| if (res < 0) |
| perror(ME "SG_SET_RESERVED_SIZE error"); |
| res = ioctl(infd, SG_GET_VERSION_NUM, &t); |
| if ((res < 0) || (t < 30000)) { |
| pr2serr(ME "sg driver prior to 3.x.y\n"); |
| return SG_LIB_CAT_OTHER; |
| } |
| if (do_mmap && (t < 30122)) { |
| pr2serr(ME "mmap-ed IO needs a sg driver version >= 3.1.22\n"); |
| return SG_LIB_CAT_OTHER; |
| } |
| } |
| } else { |
| if (do_mmap) { |
| pr2serr(ME "mmap-ed IO only support on sg devices\n"); |
| return SG_LIB_CAT_OTHER; |
| } |
| if (dd_count < 0) { |
| pr2serr(ME "negative 'count' only supported with SCSI READs\n"); |
| return SG_LIB_CAT_OTHER; |
| } |
| flags = O_RDONLY; |
| if (do_odir) |
| flags |= O_DIRECT; |
| if ((infd = open(inf, flags)) < 0) { |
| snprintf(ebuff, EBUFF_SZ, |
| ME "could not open %s for reading", inf); |
| perror(ebuff); |
| return SG_LIB_FILE_ERROR; |
| } |
| if (verbose) |
| pr2serr("Opened %s for Unix reads with flags=0x%x\n", inf, flags); |
| if (skip > 0) { |
| off64_t offset = skip; |
| |
| offset *= bs; /* could exceed 32 bits here! */ |
| if (lseek64(infd, offset, SEEK_SET) < 0) { |
| snprintf(ebuff, EBUFF_SZ, |
| ME "couldn't skip to required position on %s", inf); |
| perror(ebuff); |
| return SG_LIB_FILE_ERROR; |
| } |
| } |
| } |
| |
| if (0 == dd_count) |
| return 0; |
| orig_count = dd_count; |
| |
| if (dd_count > 0) { |
| if (do_dio || do_odir || (FT_RAW & in_type)) { |
| wrkBuff = (unsigned char *)malloc(bs * bpt + psz); |
| if (0 == wrkBuff) { |
| pr2serr("Not enough user memory for aligned storage\n"); |
| return SG_LIB_CAT_OTHER; |
| } |
| /* perhaps use posix_memalign() instead */ |
| wrkPos = (unsigned char *)(((uintptr_t)wrkBuff + psz - 1) & |
| (~(psz - 1))); |
| } else if (do_mmap) { |
| wrkPos = (unsigned char *)mmap(NULL, bs * bpt, |
| PROT_READ | PROT_WRITE, MAP_SHARED, infd, 0); |
| if (MAP_FAILED == wrkPos) { |
| perror(ME "error from mmap()"); |
| return SG_LIB_CAT_OTHER; |
| } |
| } else { |
| wrkBuff = (unsigned char *)malloc(bs * bpt); |
| if (0 == wrkBuff) { |
| pr2serr("Not enough user memory\n"); |
| return SG_LIB_CAT_OTHER; |
| } |
| wrkPos = wrkBuff; |
| } |
| } |
| |
| blocks_per = bpt; |
| start_tm.tv_sec = 0; /* just in case start set condition not met */ |
| start_tm.tv_usec = 0; |
| |
| if (verbose && (dd_count < 0)) |
| pr2serr("About to issue %" PRId64 " zero block SCSI READs\n", |
| 0 - dd_count); |
| |
| /* main loop */ |
| for (iters = 0; dd_count != 0; ++iters) { |
| if ((do_time > 0) && (iters == (do_time - 1))) |
| gettimeofday(&start_tm, NULL); |
| if (dd_count < 0) |
| blocks = 0; |
| else |
| blocks = (dd_count > blocks_per) ? blocks_per : dd_count; |
| if (FT_SG & in_type) { |
| dio_tmp = do_dio; |
| res = sg_bread(infd, wrkPos, blocks, skip, bs, scsi_cdbsz, |
| fua, dpo, &dio_tmp, do_mmap, no_dxfer); |
| if (1 == res) { /* ENOMEM, find what's available+try that */ |
| if (ioctl(infd, SG_GET_RESERVED_SIZE, &buf_sz) < 0) { |
| perror("RESERVED_SIZE ioctls failed"); |
| break; |
| } |
| if (buf_sz < MIN_RESERVED_SIZE) |
| buf_sz = MIN_RESERVED_SIZE; |
| blocks_per = (buf_sz + bs - 1) / bs; |
| blocks = blocks_per; |
| pr2serr("Reducing read to %d blocks per loop\n", blocks_per); |
| res = sg_bread(infd, wrkPos, blocks, skip, bs, scsi_cdbsz, |
| fua, dpo, &dio_tmp, do_mmap, no_dxfer); |
| } else if (2 == res) { |
| pr2serr("Unit attention, try again (r)\n"); |
| res = sg_bread(infd, wrkPos, blocks, skip, bs, scsi_cdbsz, |
| fua, dpo, &dio_tmp, do_mmap, no_dxfer); |
| } |
| if (0 != res) { |
| switch (res) { |
| case -3: |
| ret = SG_LIB_CAT_MEDIUM_HARD; |
| pr2serr(ME "SCSI READ medium/hardware error\n"); |
| break; |
| case -2: |
| ret = SG_LIB_CAT_NOT_READY; |
| pr2serr(ME "device not ready\n"); |
| break; |
| case 2: |
| ret = SG_LIB_CAT_UNIT_ATTENTION; |
| pr2serr(ME "SCSI READ unit attention\n"); |
| break; |
| case 3: |
| ret = SG_LIB_CAT_ABORTED_COMMAND; |
| pr2serr(ME "SCSI READ aborted command\n"); |
| break; |
| default: |
| ret = SG_LIB_CAT_OTHER; |
| pr2serr(ME "SCSI READ failed\n"); |
| break; |
| } |
| break; |
| } else { |
| in_full += blocks; |
| if (do_dio && (0 == dio_tmp)) |
| dio_incomplete++; |
| } |
| } else { |
| if (iters > 0) { /* subsequent iteration reset skip position */ |
| off64_t offset = skip; |
| |
| offset *= bs; /* could exceed 32 bits here! */ |
| if (lseek64(infd, offset, SEEK_SET) < 0) { |
| perror(ME "could not reset skip position"); |
| break; |
| } |
| } |
| while (((res = read(infd, wrkPos, blocks * bs)) < 0) && |
| (EINTR == errno)) |
| ; |
| if (res < 0) { |
| snprintf(ebuff, EBUFF_SZ, ME "reading, skip=%" PRId64 " ", |
| skip); |
| perror(ebuff); |
| break; |
| } else if (res < blocks * bs) { |
| pr2serr(ME "short read: wanted/got=%d/%d bytes, stop\n", |
| blocks * bs, res); |
| blocks = res / bs; |
| if ((res % bs) > 0) { |
| blocks++; |
| in_partial++; |
| } |
| dd_count -= blocks; |
| in_full += blocks; |
| break; |
| } |
| in_full += blocks; |
| } |
| if (dd_count > 0) |
| dd_count -= blocks; |
| else if (dd_count < 0) |
| ++dd_count; |
| } |
| read_str = (FT_SG & in_type) ? "SCSI READ" : "read"; |
| if (do_time > 0) { |
| gettimeofday(&end_tm, NULL); |
| if (start_tm.tv_sec || start_tm.tv_usec) { |
| struct timeval res_tm; |
| double a, b, c; |
| |
| res_tm.tv_sec = end_tm.tv_sec - start_tm.tv_sec; |
| res_tm.tv_usec = end_tm.tv_usec - start_tm.tv_usec; |
| if (res_tm.tv_usec < 0) { |
| --res_tm.tv_sec; |
| res_tm.tv_usec += 1000000; |
| } |
| a = res_tm.tv_sec; |
| a += (0.000001 * res_tm.tv_usec); |
| if (orig_count > 0) { |
| b = (double)bs * (orig_count - dd_count); |
| if (do_time > 1) |
| c = b - ((double)bs * ((do_time - 1.0) * bpt)); |
| else |
| c = 0.0; |
| } else { |
| b = 0.0; |
| c = 0.0; |
| } |
| |
| if (1 == do_time) { |
| pr2serr("Time for all %s commands was %d.%06d secs", read_str, |
| (int)res_tm.tv_sec, (int)res_tm.tv_usec); |
| if ((orig_count > 0) && (a > 0.00001) && (b > 511)) |
| pr2serr(", %.2f MB/sec\n", b / (a * 1000000.0)); |
| else |
| pr2serr("\n"); |
| } else if (2 == do_time) { |
| pr2serr("Time from second %s command to end was %d.%06d secs", |
| read_str, (int)res_tm.tv_sec, |
| (int)res_tm.tv_usec); |
| if ((orig_count > 0) && (a > 0.00001) && (c > 511)) |
| pr2serr(", %.2f MB/sec\n", c / (a * 1000000.0)); |
| else |
| pr2serr("\n"); |
| } else { |
| pr2serr("Time from start of %s command " |
| "#%d to end was %d.%06d secs", read_str, do_time, |
| (int)res_tm.tv_sec, (int)res_tm.tv_usec); |
| if ((orig_count > 0) && (a > 0.00001) && (c > 511)) |
| pr2serr(", %.2f MB/sec\n", c / (a * 1000000.0)); |
| else |
| pr2serr("\n"); |
| } |
| if ((iters > 0) && (a > 0.00001)) |
| pr2serr("Average number of %s commands per second was %.2f\n", |
| read_str, (double)iters / a); |
| } |
| } |
| |
| if (wrkBuff) |
| free(wrkBuff); |
| |
| close(infd); |
| res = 0; |
| if (0 != dd_count) { |
| pr2serr("Some error occurred,"); |
| if (0 == ret) |
| ret = SG_LIB_CAT_OTHER; |
| } |
| print_stats(iters, read_str); |
| |
| if (dio_incomplete) { |
| int fd; |
| char c; |
| |
| pr2serr(">> Direct IO requested but incomplete %d times\n", |
| dio_incomplete); |
| if ((fd = open(proc_allow_dio, O_RDONLY)) >= 0) { |
| if (1 == read(fd, &c, 1)) { |
| if ('0' == c) |
| pr2serr(">>> %s set to '0' but should be set to '1' for " |
| "direct IO\n", proc_allow_dio); |
| } |
| close(fd); |
| } |
| } |
| if (sum_of_resids) |
| pr2serr(">> Non-zero sum of residual counts=%d\n", sum_of_resids); |
| return (ret >= 0) ? ret : SG_LIB_CAT_OTHER; |
| } |
