| #ifndef _SCST_BACKPORT_H_ |
| #define _SCST_BACKPORT_H_ |
| |
| /* |
| * Copyright (C) 2015 - 2018 Western Digital Corporation |
| * |
| * Backports of functions introduced in recent kernel versions. |
| * |
| * Please keep the functions in this file sorted according to the name of the |
| * header file in which these have been defined. |
| * |
| * 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/version.h> |
| #ifndef RHEL_RELEASE_VERSION |
| #define RHEL_RELEASE_VERSION(a, b) (((a) << 8) + (b)) |
| #endif |
| #include <linux/bio.h> |
| #include <linux/blkdev.h> /* struct request_queue */ |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 21, 0) || \ |
| (defined(RHEL_MAJOR) && RHEL_MAJOR -0 >= 8) |
| #include <linux/blk-mq.h> |
| #endif |
| #include <linux/bsg-lib.h> /* struct bsg_job */ |
| #include <linux/dmapool.h> |
| #include <linux/eventpoll.h> |
| #include <linux/iocontext.h> |
| #include <linux/kobject_ns.h> |
| #include <linux/scatterlist.h> /* struct scatterlist */ |
| #include <linux/slab.h> /* kmalloc() */ |
| #include <linux/stddef.h> /* sizeof_field() */ |
| #include <linux/timer.h> |
| #include <linux/vmalloc.h> |
| #include <linux/workqueue.h> |
| #include <linux/writeback.h> /* sync_page_range() */ |
| #include <net/net_namespace.h> /* init_net */ |
| #include <rdma/ib_verbs.h> |
| #include <scsi/scsi_cmnd.h> /* struct scsi_cmnd */ |
| #include <scsi/scsi_eh.h> /* scsi_build_sense_buffer() */ |
| struct scsi_target; |
| #include <scsi/scsi_transport_fc.h> /* struct bsg_job */ |
| #include <asm/unaligned.h> /* get_unaligned_be64() */ |
| |
| /* <asm-generic/barrier.h> */ |
| |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 16, 0) |
| #define smp_mb__after_atomic_inc smp_mb__after_atomic |
| #define smp_mb__after_clear_bit smp_mb__after_atomic |
| #define smp_mb__before_atomic_dec smp_mb__before_atomic |
| #define smp_mb__after_atomic_dec smp_mb__after_atomic |
| #endif |
| |
| /* <asm/msr.h> */ |
| |
| #ifdef CONFIG_X86 |
| #include <asm/msr.h> |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0) && !defined(RHEL_RELEASE_CODE) |
| static __always_inline unsigned long long rdtsc(void) |
| { |
| return native_read_tsc(); |
| } |
| #endif |
| #else |
| static __always_inline unsigned long long rdtsc(void) |
| { |
| return 0; |
| } |
| #define tsc_khz 1000 |
| #endif |
| |
| /* <linux/err.h> */ |
| |
| /* |
| * See also commit 6e8b8726ad50 ("PTR_RET is now PTR_ERR_OR_ZERO") # v3.12 |
| */ |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 12, 0) && !defined(RHEL_RELEASE_CODE) |
| #define PTR_ERR_OR_ZERO(p) PTR_RET(p) |
| #endif |
| |
| /* <linux/bio.h> */ |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0) && \ |
| !defined(CONFIG_SUSE_KERNEL) |
| static inline struct bio_set *bioset_create_backport(unsigned int pool_size, |
| unsigned int front_pad, |
| int flags) |
| { |
| WARN_ON_ONCE(flags != 0); |
| return bioset_create(pool_size, front_pad); |
| } |
| #define bioset_create bioset_create_backport |
| #define BIOSET_NEED_BVECS 0 |
| #endif |
| |
| /* See also commit 74d46992e0d9. */ |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 14, 0) && \ |
| !defined(CONFIG_SUSE_KERNEL) |
| static inline void bio_set_dev(struct bio *bio, struct block_device *bdev) |
| { |
| bio->bi_bdev = bdev; |
| } |
| #endif |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 12, 0) |
| /* |
| * See also commit a8affc03a9b3 ("block: rename BIO_MAX_PAGES to BIO_MAX_VECS") |
| * # v5.12. |
| */ |
| #define BIO_MAX_VECS BIO_MAX_PAGES |
| #endif |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 18, 0) && \ |
| (!defined(RHEL_RELEASE_CODE) || \ |
| RHEL_RELEASE_CODE -0 < RHEL_RELEASE_VERSION(9, 1)) |
| /* |
| * See also commit 609be1066731 ("block: pass a block_device and opf to |
| * bio_alloc_bioset") # v5.18 |
| */ |
| static inline |
| struct bio *bio_alloc_bioset_backport(struct block_device *bdev, |
| unsigned short nr_vecs, unsigned int opf, gfp_t gfp_mask, |
| struct bio_set *bs) |
| { |
| /* |
| * Check that @bdev and @opf parameters are zeros. |
| * |
| * The old API expects these parameters to be set implicitly. |
| * Therefore, warn about using an explicit setting that would |
| * cause these parameters to be lost. |
| */ |
| WARN_ON_ONCE(bdev || opf); |
| |
| return bio_alloc_bioset(gfp_mask, nr_vecs, bs); |
| } |
| |
| #define bio_alloc_bioset bio_alloc_bioset_backport |
| |
| /* |
| * See also commit 07888c665b40 ("block: pass a block_device and opf to |
| * bio_alloc") # v5.18 |
| */ |
| static inline |
| struct bio *bio_alloc_backport(struct block_device *bdev, |
| unsigned short nr_vecs, unsigned int opf, gfp_t gfp_mask) |
| { |
| /* |
| * Check that @bdev and @opf parameters are zeros. |
| * |
| * The old API expects these parameters to be set implicitly. |
| * Therefore, warn about using an explicit setting that would |
| * cause these parameters to be lost. |
| */ |
| WARN_ON_ONCE(bdev || opf); |
| |
| return bio_alloc(gfp_mask, nr_vecs); |
| } |
| |
| #define bio_alloc bio_alloc_backport |
| |
| #endif |
| |
| /* <linux/blk_types.h> */ |
| |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 14, 0) |
| enum { |
| REQ_OP_SCSI_IN = REQ_OP_DRV_IN, |
| REQ_OP_SCSI_OUT = REQ_OP_DRV_OUT, |
| }; |
| #endif |
| |
| /* <linux/blk-mq.h> */ |
| |
| static inline unsigned int scst_blk_rq_cpu(struct request *rq) |
| { |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 21, 0) && \ |
| (!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 8) |
| return rq->cpu; |
| #else |
| return blk_mq_rq_cpu(rq); |
| #endif |
| } |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 19, 0) && \ |
| (!defined(RHEL_RELEASE_CODE) || \ |
| RHEL_RELEASE_CODE -0 < RHEL_RELEASE_VERSION(9, 1)) |
| /* |
| * See also commit e2e530867245 ("blk-mq: remove the done argument to |
| * blk_execute_rq_nowait") # v5.19. |
| */ |
| static inline |
| void blk_execute_rq_nowait_backport(struct request *rq, bool at_head) |
| { |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 12, 0) |
| /* |
| * See also commit 8eeed0b554b9 ("block: remove unnecessary argument from |
| * blk_execute_rq_nowait") # v5.12. |
| */ |
| blk_execute_rq_nowait(rq->q, NULL, rq, at_head, rq->end_io); |
| #elif LINUX_VERSION_CODE < KERNEL_VERSION(5, 17, 0) |
| /* |
| * See also commit b84ba30b6c7a ("block: remove the gendisk argument to |
| * blk_execute_rq") # v5.17. |
| */ |
| blk_execute_rq_nowait(NULL, rq, at_head, rq->end_io); |
| #else |
| blk_execute_rq_nowait(rq, at_head, rq->end_io); |
| #endif |
| } |
| |
| #define blk_execute_rq_nowait blk_execute_rq_nowait_backport |
| #endif |
| |
| /* <linux/blkdev.h> */ |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 19, 0) && \ |
| (!defined(RHEL_RELEASE_CODE) || \ |
| RHEL_RELEASE_CODE -0 < RHEL_RELEASE_VERSION(9, 1)) |
| /* |
| * See also commit 44abff2c0b97 ("block: decouple REQ_OP_SECURE_ERASE |
| * from REQ_OP_DISCARD") # v5.19. |
| */ |
| static inline |
| int blkdev_issue_discard_backport(struct block_device *bdev, sector_t sector, |
| sector_t nr_sects, gfp_t gfp_mask) |
| { |
| return blkdev_issue_discard(bdev, sector, nr_sects, gfp_mask, 0); |
| } |
| |
| #define blkdev_issue_discard blkdev_issue_discard_backport |
| #endif |
| |
| /* <linux/byteorder/generic.h> */ |
| /* |
| * See also f2f2efb807d3 ("byteorder: Move {cpu_to_be32, be32_to_cpu}_array() |
| * from Thunderbolt to core") # v4.15. |
| */ |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 15, 0) && \ |
| (!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 7 || \ |
| RHEL_MAJOR -0 == 7 && RHEL_MINOR -0 < 5) && \ |
| !defined(UEK_KABI_RENAME) |
| static inline void cpu_to_be32_array(__be32 *dst, const u32 *src, size_t len) |
| { |
| int i; |
| |
| for (i = 0; i < len; i++) |
| dst[i] = cpu_to_be32(src[i]); |
| } |
| |
| static inline void be32_to_cpu_array(u32 *dst, const __be32 *src, size_t len) |
| { |
| int i; |
| |
| for (i = 0; i < len; i++) |
| dst[i] = be32_to_cpu(src[i]); |
| } |
| #endif |
| |
| /* <linux/compiler.h> */ |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 19, 0) && !defined(READ_ONCE) |
| /* |
| * See also patch "kernel: Provide READ_ONCE and ASSIGN_ONCE" (commit ID |
| * 230fa253df6352af12ad0a16128760b5cb3f92df). |
| */ |
| #define READ_ONCE(x) (*(volatile typeof(x) *)&(x)) |
| |
| #endif |
| |
| /* <linux/compiler_attributes.h> */ |
| |
| /* See also commit 294f69e662d1 ("compiler_attributes.h: Add 'fallthrough' |
| * pseudo keyword for switch/case use") # v5.4 |
| */ |
| #ifndef fallthrough |
| #if __GNUC__ >= 5 |
| #if __has_attribute(__fallthrough__) |
| #define fallthrough __attribute__((__fallthrough__)) |
| #else |
| #define fallthrough do {} while (0) /* fallthrough */ |
| #endif |
| #else |
| /* gcc 4.x doesn't support __has_attribute() */ |
| #define fallthrough do {} while (0) /* fallthrough */ |
| #endif |
| #endif |
| |
| /* <linux/debugfs.h> */ |
| |
| /* |
| * See also commit c64688081490 ("debugfs: add support for self-protecting |
| * attribute file fops") # v4.7. |
| */ |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 7, 0) |
| #define DEFINE_DEBUGFS_ATTRIBUTE(__fops, __get, __set, __fmt) \ |
| static int __fops ## _open(struct inode *inode, struct file *file) \ |
| { \ |
| __simple_attr_check_format(__fmt, 0ull); \ |
| return simple_attr_open(inode, file, __get, __set, __fmt); \ |
| } \ |
| static const struct file_operations __fops = { \ |
| .owner = THIS_MODULE, \ |
| .open = __fops ## _open, \ |
| .release = simple_attr_release, \ |
| .read = debugfs_attr_read, \ |
| .write = debugfs_attr_write, \ |
| .llseek = no_llseek, \ |
| } |
| |
| static inline ssize_t debugfs_attr_read(struct file *file, char __user *buf, |
| size_t len, loff_t *ppos) |
| { |
| return -ENOENT; |
| } |
| static inline ssize_t debugfs_attr_write(struct file *file, |
| const char __user *buf, size_t len, loff_t *ppos) |
| { |
| return -ENOENT; |
| } |
| #endif |
| |
| /* <linux/device.h> */ |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 11, 0) |
| /* |
| * See also commit ced321bf9151 ("driver core: device.h: add RW and RO |
| * attribute macros") # v3.11. |
| */ |
| #define DEVICE_ATTR_RW(_name) \ |
| struct device_attribute dev_attr_##_name = __ATTR_RW(_name) |
| #endif |
| |
| /* <linux/dlm.h> */ |
| |
| /* <linux/dmapool.h> */ |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0) && \ |
| (!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 7) |
| /* See also ad82362b2def ("mm: add dma_pool_zalloc() call to DMA API") # v4.3 */ |
| static inline void *dma_pool_zalloc(struct dma_pool *pool, gfp_t mem_flags, |
| dma_addr_t *handle) |
| { |
| return dma_pool_alloc(pool, mem_flags | __GFP_ZERO, handle); |
| } |
| #endif |
| |
| /* <linux/eventpoll.h> */ |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 16, 0) |
| /* |
| * See also commit 65aaf87b3aa2 ("add EPOLLNVAL, annotate EPOLL... and |
| * event_poll->event"). |
| */ |
| typedef unsigned int __poll_t; |
| #define EPOLLNVAL POLLNVAL |
| #endif |
| |
| /* |
| * See also commit 7e040726850a ("eventpoll.h: add missing epoll event masks"). |
| * Note: this commit got backported to multiple stable kernels, including |
| * v3.18.93. |
| */ |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 12, 0) |
| #if !defined(EPOLLIN) |
| #define EPOLLIN POLLIN |
| #endif |
| #if !defined(EPOLLPRI) |
| #define EPOLLPRI POLLPRI |
| #endif |
| #if !defined(EPOLLOUT) |
| #define EPOLLOUT POLLOUT |
| #endif |
| #if !defined(EPOLLERR) |
| #define EPOLLERR POLLERR |
| #endif |
| #if !defined(EPOLLHUP) |
| #define EPOLLHUP POLLHUP |
| #endif |
| #if !defined(EPOLLRDNORM) |
| #define EPOLLRDNORM POLLRDNORM |
| #endif |
| #if !defined(EPOLLRDBAND) |
| #define EPOLLRDBAND POLLRDBAND |
| #endif |
| #if !defined(EPOLLWRNORM) |
| #define EPOLLWRNORM POLLWRNORM |
| #endif |
| #if !defined(EPOLLWRBAND) |
| #define EPOLLWRBAND POLLWRBAND |
| #endif |
| #if !defined(EPOLLMSG) |
| #define EPOLLMSG POLLMSG |
| #endif |
| #if !defined(EPOLLRDHUP) |
| #define EPOLLRDHUP POLLRDHUP |
| #endif |
| #endif |
| |
| /* <linux/fs.h> */ |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 7, 0) |
| /* See also commit dde0c2e79848 ("fs: add IOCB_SYNC and IOCB_DSYNC") */ |
| #define IOCB_DSYNC 0 |
| #endif |
| |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 16, 0) && \ |
| LINUX_VERSION_CODE < KERNEL_VERSION(4, 11, 0) |
| /* |
| * See also commit bb7462b6fd64 ("vfs: use helpers for calling |
| * f_op->{read,write}_iter()"). |
| */ |
| static inline ssize_t call_read_iter(struct file *file, struct kiocb *kio, |
| struct iov_iter *iter) |
| { |
| return file->f_op->read_iter(kio, iter); |
| } |
| |
| static inline ssize_t call_write_iter(struct file *file, struct kiocb *kio, |
| struct iov_iter *iter) |
| { |
| return file->f_op->write_iter(kio, iter); |
| } |
| #endif |
| |
| /* |
| * See also commit b745fafaf70c ("fs: Introduce RWF_NOWAIT and |
| * FMODE_AIO_NOWAIT") # v4.13. |
| */ |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0) && \ |
| !defined(CONFIG_SUSE_KERNEL) |
| #define IOCB_NOWAIT 0 |
| #endif |
| |
| /* See also commit bdd1d2d3d251 ("fs: fix kernel_read prototype") # v4.14 */ |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 14, 0) |
| static inline ssize_t |
| kernel_read_backport(struct file *file, void *buf, size_t count, loff_t *pos) |
| { |
| return kernel_read(file, *pos, buf, count); |
| } |
| |
| #define kernel_read(file, buf, count, pos) \ |
| kernel_read_backport((file), (buf), (count), (pos)) |
| |
| /* |
| * See also commit 7bb307e894d5 ("export kernel_write(), convert open-coded |
| * instances") # v3.9. |
| */ |
| static inline ssize_t |
| kernel_write_backport(struct file *file, const void *buf, size_t count, |
| loff_t *pos) |
| { |
| #ifndef CONFIG_SUSE_KERNEL |
| int res = kernel_write(file, buf, count, *pos); |
| |
| if (res > 0) |
| *pos += res; |
| |
| return res; |
| #else |
| return kernel_write(file, buf, count, pos); |
| #endif |
| } |
| |
| #define kernel_write kernel_write_backport |
| #endif |
| |
| /* <linux/iocontext.h> */ |
| |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 21, 0) || \ |
| (defined(RHEL_MAJOR) && RHEL_MAJOR -0 >= 8) |
| |
| static inline struct io_context * |
| scst_get_task_io_context(struct task_struct *task, |
| gfp_t gfp_flags, int node) |
| { |
| return NULL; |
| } |
| |
| static inline void scst_put_io_context(struct io_context *ioc) |
| { |
| } |
| |
| static inline void scst_ioc_task_link(struct io_context *ioc) |
| { |
| } |
| |
| #define get_task_io_context scst_get_task_io_context |
| #define put_io_context scst_put_io_context |
| #define ioc_task_link scst_ioc_task_link |
| |
| #endif |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 17, 0) |
| /* Suboptimal algorithm for computing the square root of a 64-bit number */ |
| static inline u32 int_sqrt64(u64 x) |
| { |
| u32 r = 0, s; |
| int i; |
| |
| for (i = 8 * sizeof(r) - 2; i >= 0; i--) { |
| s = r + (1 << i); |
| if (1ull * s * s <= x) |
| r = s; |
| } |
| |
| return r; |
| } |
| #endif |
| |
| #if LINUX_VERSION_CODE >> 8 == KERNEL_VERSION(4, 4, 0) >> 8 && \ |
| LINUX_VERSION_CODE >= KERNEL_VERSION(4, 4, 168) |
| /* |
| * See also commit 8e50b8b07f46 ("mm: replace get_user_pages() write/force |
| * parameters with gup_flags") # v4.4.168. |
| */ |
| static inline long get_user_pages_backport(unsigned long start, |
| unsigned long nr_pages, |
| unsigned int gup_flags, |
| struct page **pages, |
| struct vm_area_struct **vmas) |
| { |
| return get_user_pages(current, current->mm, start, nr_pages, gup_flags, |
| pages, vmas); |
| } |
| #define get_user_pages get_user_pages_backport |
| #elif !defined(CONFIG_SUSE_KERNEL) && \ |
| LINUX_VERSION_CODE < KERNEL_VERSION(4, 6, 0) |
| /* |
| * See also commit cde70140fed8 ("mm/gup: Overload get_user_pages() functions") |
| * # v4.6. |
| */ |
| static inline long get_user_pages_backport(unsigned long start, |
| unsigned long nr_pages, |
| unsigned int gup_flags, |
| struct page **pages, |
| struct vm_area_struct **vmas) |
| { |
| const bool write = gup_flags & FOLL_WRITE; |
| const bool force = 0; |
| |
| WARN_ON_ONCE(gup_flags & ~FOLL_WRITE); |
| return get_user_pages(current, current->mm, start, nr_pages, write, |
| force, pages, vmas); |
| } |
| #define get_user_pages get_user_pages_backport |
| #elif (!defined(CONFIG_SUSE_KERNEL) && \ |
| LINUX_VERSION_CODE < KERNEL_VERSION(4, 9, 0)) || \ |
| LINUX_VERSION_CODE < KERNEL_VERSION(4, 4, 0) |
| /* |
| * See also commit 768ae309a961 ("mm: replace get_user_pages() write/force |
| * parameters with gup_flags") # v4.9. |
| */ |
| static inline long get_user_pages_backport(unsigned long start, |
| unsigned long nr_pages, |
| unsigned int gup_flags, |
| struct page **pages, |
| struct vm_area_struct **vmas) |
| { |
| const bool write = gup_flags & FOLL_WRITE; |
| const bool force = 0; |
| |
| WARN_ON_ONCE(gup_flags & ~FOLL_WRITE); |
| return get_user_pages(start, nr_pages, write, force, pages, vmas); |
| } |
| #define get_user_pages get_user_pages_backport |
| #endif |
| |
| /* <linux/kobject_ns.h> */ |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 16, 0) && \ |
| (!defined(RHEL_RELEASE_CODE) || \ |
| RHEL_RELEASE_CODE -0 < RHEL_RELEASE_VERSION(7, 6)) |
| /* |
| * See also commit 5f256becd868 ("[NET]: Basic network namespace |
| * infrastructure."; v2.6.24). a685e08987d1 ("Delay struct net freeing while |
| * there's a sysfs instance refering to it"; v3.0). See also commit |
| * 172856eac7cf ("kobject: Export kobj_ns_grab_current() and kobj_ns_drop()"; |
| * v4.16). |
| */ |
| static inline void *kobj_ns_grab_current_backport(enum kobj_ns_type type) |
| { |
| WARN_ON_ONCE(type != KOBJ_NS_TYPE_NET); |
| return &init_net; |
| } |
| |
| static inline void kobj_ns_drop_backport(enum kobj_ns_type type, void *ns) |
| { |
| } |
| |
| #define kobj_ns_grab_current kobj_ns_grab_current_backport |
| #define kobj_ns_drop kobj_ns_drop_backport |
| #endif |
| |
| /* <linux/kref.h> */ |
| |
| /* See also commit 2c935bc57221 */ |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 11, 0) |
| #define kref_read(kref) (atomic_read(&(kref)->refcount)) |
| #endif |
| |
| /* <linux/ktime.h> */ |
| |
| #if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 0)) && \ |
| (!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 7) |
| /** |
| * ktime_before - Compare if a ktime_t value is smaller than another one. |
| * @cmp1: comparable1 |
| * @cmp2: comparable2 |
| * |
| * Return: true if cmp1 happened before cmp2. |
| */ |
| static inline bool ktime_before(const ktime_t cmp1, const ktime_t cmp2) |
| { |
| return ktime_compare(cmp1, cmp2) < 0; |
| } |
| #endif |
| |
| /* <linux/list.h> */ |
| |
| #ifndef __list_for_each |
| /* ToDo: cleanup when both are the same for all relevant kernels */ |
| #define __list_for_each list_for_each |
| #endif |
| |
| /* |
| * Returns true if entry is in its list. Entry must be deleted from the |
| * list by using list_del_init()! |
| */ |
| static inline bool list_entry_in_list(const struct list_head *entry) |
| { |
| return !list_empty(entry); |
| } |
| |
| /* <linux/lockdep.h> */ |
| |
| /* |
| * See also commit 108c14858b9e ("locking/lockdep: Add support for dynamic |
| * keys"). |
| */ |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 1, 0) && \ |
| (!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 8 || \ |
| (RHEL_MAJOR -0 == 8 && RHEL_MINOR -0 < 2)) |
| static inline void lockdep_register_key(struct lock_class_key *key) |
| { |
| } |
| |
| static inline void lockdep_unregister_key(struct lock_class_key *key) |
| { |
| } |
| #endif |
| |
| /* |
| * See also commit 5facae4f3549 ("locking/lockdep: Remove unused @nested |
| * argument from lock_release()"). |
| */ |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 5, 0) && \ |
| (!defined(RHEL_RELEASE_CODE) || \ |
| RHEL_RELEASE_CODE -0 < RHEL_RELEASE_VERSION(8, 3)) |
| #undef rwlock_release |
| #define rwlock_release(l, i) lock_release(l, 1, i) |
| #undef mutex_release |
| #define mutex_release(l, i) lock_release(l, 0, i) |
| #endif |
| |
| /* <linux/mempoool.h> */ |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0) |
| /* |
| * See also commit 4e3ca3e033d1 ("mm/mempool: allow NULL `pool' pointer in |
| * mempool_destroy()") # v4.3. |
| */ |
| static inline void mempool_destroy_backport(mempool_t *pool) |
| { |
| if (pool) |
| mempool_destroy(pool); |
| } |
| |
| #define mempool_destroy mempool_destroy_backport |
| #endif |
| |
| /* <linux/mm.h> */ |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 12, 0) && \ |
| (!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 7 || \ |
| (RHEL_MAJOR -0 == 7 && RHEL_MINOR -0 < 5)) && \ |
| !defined(_COMPAT_LINUX_MM_H) |
| #if !defined(UEK_KABI_RENAME) |
| /* See also commit a7c3e901a46f ("mm: introduce kv[mz]alloc helpers") # v4.12 */ |
| static inline void *kvmalloc_node(size_t size, gfp_t flags, int node) |
| { |
| gfp_t kmalloc_flags = flags; |
| void *ret; |
| |
| WARN_ON_ONCE(flags & ~(GFP_KERNEL | __GFP_ZERO)); |
| |
| /* |
| * vmalloc uses GFP_KERNEL for some internal allocations (e.g page |
| * tables) so the given set of flags has to be compatible. |
| */ |
| if ((flags & GFP_KERNEL) != GFP_KERNEL) |
| return kmalloc_node(size, flags, node); |
| |
| /* |
| * We want to attempt a large physically contiguous block first because |
| * it is less likely to fragment multiple larger blocks and therefore |
| * contribute to a long term fragmentation less than vmalloc fallback. |
| * However make sure that larger requests are not too disruptive - no |
| * OOM killer and no allocation failure warnings as we have a fallback. |
| */ |
| if (size > PAGE_SIZE) { |
| kmalloc_flags |= __GFP_NOWARN; |
| |
| if (!(kmalloc_flags & __GFP_REPEAT)) |
| kmalloc_flags |= __GFP_NORETRY; |
| } |
| |
| ret = kmalloc_node(size, kmalloc_flags, node); |
| |
| /* |
| * It doesn't really make sense to fallback to vmalloc for sub page |
| * requests |
| */ |
| if (ret || size <= PAGE_SIZE) |
| return ret; |
| |
| ret = vmalloc_node(size, node); |
| if (ret && (flags & __GFP_ZERO)) |
| memset(ret, 0, size); |
| |
| return ret; |
| } |
| |
| static inline void *kvmalloc(size_t size, gfp_t flags) |
| { |
| return kvmalloc_node(size, flags, NUMA_NO_NODE); |
| } |
| |
| static inline void *kvzalloc(size_t size, gfp_t flags) |
| { |
| return kvmalloc(size, flags | __GFP_ZERO); |
| } |
| #endif |
| |
| /* |
| * See also commit 752ade68cbd8 ("treewide: use kv[mz]alloc* rather than |
| * opencoded variants") # v4.12. |
| */ |
| static inline void *kvmalloc_array(size_t n, size_t size, gfp_t flags) |
| { |
| return kvmalloc(n * size, flags); |
| } |
| #endif |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 18, 0) && \ |
| (!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 7 || \ |
| RHEL_MAJOR -0 == 7 && RHEL_MINOR -0 < 7) && \ |
| !defined(CONFIG_SUSE_KERNEL) && \ |
| !defined(_COMPAT_LINUX_MM_H) && \ |
| !defined(UEK_KABI_RENAME) |
| /* See also commit 1c542f38ab8d ("mm: Introduce kvcalloc()") # v4.18. */ |
| static inline void *kvcalloc(size_t n, size_t size, gfp_t flags) |
| { |
| return kvmalloc(n * size, flags | __GFP_ZERO); |
| } |
| #endif |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 15, 0) && \ |
| !(LINUX_VERSION_CODE >> 8 == KERNEL_VERSION(3, 12, 0) >> 8 && \ |
| LINUX_VERSION_CODE >= KERNEL_VERSION(3, 12, 41)) && \ |
| (!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 6) |
| /* |
| * See also commit 39f1f78d53b9 ("nick kvfree() from apparmor") # v3.15. |
| * See also commit fb6a2a8ebe27 ("nick kvfree() from apparmor") # v3.12.41. |
| */ |
| static inline void kvfree(void *addr) |
| { |
| if (is_vmalloc_addr(addr)) |
| vfree(addr); |
| else |
| kfree(addr); |
| } |
| #endif |
| |
| /* <linux/shrinker.h> */ |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(6, 0, 0) |
| /* |
| * See also commit e33c267ab70d ("mm: shrinkers: provide shrinkers with |
| * names") # v6.0. |
| */ |
| static inline |
| int register_shrinker_backport(struct shrinker *shrinker, const char *fmt, ...) |
| { |
| /* |
| * See also commit 1d3d4437eae1 ("vmscan: per-node deferred work") # v3.12 |
| */ |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 12, 0) |
| return register_shrinker(shrinker); |
| #else |
| register_shrinker(shrinker); |
| return 0; |
| #endif |
| } |
| |
| #define register_shrinker register_shrinker_backport |
| #endif |
| |
| /* <linux/module.h> */ |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 4, 0) |
| #define MODULE_IMPORT_NS(ns) |
| #endif |
| |
| /* <linux/nvme-fc.h> */ |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0) && \ |
| (!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 7) |
| #define FC_TYPE_NVME 0x28 |
| #endif |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0) |
| enum nvmefc_fcp_datadir { |
| NVMEFC_FCP_NODATA, |
| NVMEFC_FCP_WRITE, |
| NVMEFC_FCP_READ, |
| }; |
| struct nvme_fc_ersp_iu { |
| }; |
| struct nvmefc_fcp_req { |
| void *cmdaddr; |
| void *rspaddr; |
| dma_addr_t cmddma; |
| dma_addr_t rspdma; |
| u16 cmdlen; |
| u16 rsplen; |
| |
| u32 payload_length; |
| struct sg_table sg_table; |
| struct scatterlist *first_sgl; |
| int sg_cnt; |
| enum nvmefc_fcp_datadir io_dir; |
| |
| __le16 sqid; |
| |
| void (*done)(struct nvmefc_fcp_req *req); |
| |
| void *private; |
| |
| u32 transferred_length; |
| u16 rcv_rsplen; |
| u32 status; |
| } __aligned(sizeof(u64)); /* alignment for other things alloc'd with */ |
| #endif |
| |
| /* <linux/percpu-refcount.h> */ |
| |
| #if defined(RHEL_MAJOR) && RHEL_MAJOR -0 >= 7 || \ |
| LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0) |
| #include <linux/percpu-refcount.h> |
| #endif |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 3, 0) && \ |
| (!defined(RHEL_RELEASE_CODE) || \ |
| RHEL_RELEASE_CODE -0 < RHEL_RELEASE_VERSION(8, 3)) |
| /* |
| * See also commit 09ed79d6d75f ("percpu_ref: introduce PERCPU_REF_ALLOW_REINIT |
| * flag") # v5.3. |
| */ |
| #define PERCPU_REF_ALLOW_REINIT 0 |
| #endif |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 17, 0) |
| #define PERCPU_COUNT_BIAS (1U << 31) |
| #endif |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 0) && \ |
| (!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 7) |
| typedef unsigned int percpu_count_t; |
| #define READ_REF_COUNT(ref) atomic_read(&(ref)->count) |
| #else |
| typedef unsigned long percpu_count_t; |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 10, 0) |
| #define READ_REF_COUNT(ref) atomic_long_read(&(ref)->count) |
| #else |
| #define READ_REF_COUNT(ref) atomic_long_read(&(ref)->data->count) |
| #endif |
| #endif |
| |
| /* |
| * For kernel versions that have <linux/percpu-refcount.h>, backport the |
| * functionality that is missing from that header file. |
| */ |
| #if (defined(RHEL_MAJOR) && RHEL_MAJOR -0 >= 7) || \ |
| LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0) |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 20, 0) && \ |
| (!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 8) |
| |
| /* |
| * See also commit 18c9a6bbe064 ("percpu-refcount: Introduce |
| * percpu_ref_resurrect()") # v4.20. |
| */ |
| static inline void percpu_ref_resurrect(struct percpu_ref *ref) |
| { |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 17, 0) || \ |
| (defined(RHEL_MAJOR) && RHEL_MAJOR -0 >= 7) |
| percpu_ref_reinit(ref); |
| #else |
| unsigned __percpu *pcpu_count = (unsigned __percpu *) |
| ((uintptr_t)ref->pcpu_count & ~PCPU_REF_DEAD); |
| int cpu; |
| |
| BUG_ON(!pcpu_count); |
| //WARN_ON(!percpu_ref_is_zero(ref)); |
| |
| atomic_set(&ref->count, 1 + PERCPU_COUNT_BIAS); |
| |
| /* |
| * Restore per-cpu operation. The barrier guarantees that the zeroing |
| * is visible to all percpu accesses which can see the following |
| * PCPU_REF_DEAD clearing. |
| */ |
| for_each_possible_cpu(cpu) |
| *per_cpu_ptr(pcpu_count, cpu) = 0; |
| |
| ref->pcpu_count = (unsigned __percpu *) |
| ((uintptr_t)ref->pcpu_count & ~PCPU_REF_DEAD); |
| smp_mb(); |
| #endif |
| } |
| |
| #if !(defined(RHEL_MAJOR) && RHEL_MAJOR -0 >= 7) |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 0) |
| /* |
| * See also commit 4c907baf36d8 ("percpu_ref: implement percpu_ref_is_dying()") |
| * # v4.0. |
| */ |
| static inline bool percpu_ref_is_dying(struct percpu_ref *ref) |
| { |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 17, 0) |
| return (uintptr_t)ref->pcpu_count & PCPU_REF_DEAD; |
| #else |
| return ref->pcpu_count_ptr & PCPU_REF_DEAD; |
| #endif |
| } |
| #elif LINUX_VERSION_CODE < KERNEL_VERSION(4, 0, 0) |
| static inline bool percpu_ref_is_dying(struct percpu_ref *ref) |
| { |
| return ref->percpu_count_ptr & __PERCPU_REF_DEAD; |
| } |
| #endif |
| #endif /* !(defined(RHEL_MAJOR) && RHEL_MAJOR -0 >= 7) */ |
| |
| #endif /* LINUX_VERSION_CODE < KERNEL_VERSION(4, 20, 0) */ |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 0) && \ |
| !(defined(RHEL_MAJOR) && RHEL_MAJOR -0 >= 7) |
| /* |
| * See also commit 2aad2a86f668 ("percpu_ref: add PERCPU_REF_INIT_* flags") |
| * # v3.18. |
| */ |
| static inline int __must_check percpu_ref_init_backport(struct percpu_ref *ref, |
| percpu_ref_func_t *release, unsigned int flags, |
| gfp_t gfp) |
| { |
| WARN_ON_ONCE(flags != 0); |
| WARN_ON_ONCE(gfp != GFP_KERNEL); |
| return percpu_ref_init(ref, release); |
| } |
| #define percpu_ref_init percpu_ref_init_backport |
| |
| /* |
| * See also commit 9e804d1f58da ("percpu_ref: rename things to prepare for |
| * decoupling percpu/atomic mode switch") # v3.18. |
| */ |
| static inline bool __ref_is_percpu(struct percpu_ref *ref, |
| percpu_count_t __percpu **percpu_countp) |
| { |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 17, 0) |
| uintptr_t pcpu_ptr = (uintptr_t)ACCESS_ONCE(ref->pcpu_count); |
| |
| if (unlikely(pcpu_ptr & PCPU_REF_DEAD)) |
| return false; |
| |
| *percpu_countp = (percpu_count_t __percpu *)pcpu_ptr; |
| return true; |
| #else |
| return __pcpu_ref_alive(ref, percpu_countp); |
| #endif |
| } |
| #endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 0) */ |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 17, 0) && \ |
| !(defined(RHEL_MAJOR) && RHEL_MAJOR -0 >= 7) |
| /* |
| * See also commit 2d7227828e14 ("percpu-refcount: implement percpu_ref_reinit() |
| * and percpu_ref_is_zero()") # v3.17. |
| */ |
| static inline bool percpu_ref_is_zero(struct percpu_ref *ref) |
| { |
| return !atomic_read(&ref->count); |
| } |
| /* |
| * See also commit 9a1049da9bd2 ("percpu-refcount: require percpu_ref to be |
| * exited explicitly") # v3.17. |
| */ |
| static inline void percpu_ref_exit(struct percpu_ref *ref) |
| { |
| } |
| #endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3, 17, 0) */ |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 0) && \ |
| !(defined(RHEL_MAJOR) && RHEL_MAJOR -0 >= 7) |
| static inline bool percpu_ref_tryget_live(struct percpu_ref *ref) |
| { |
| percpu_count_t __percpu *percpu_count; |
| bool ret = false; |
| |
| rcu_read_lock(); |
| |
| if (__ref_is_percpu(ref, &percpu_count)) { |
| this_cpu_inc(*percpu_count); |
| ret = true; |
| } else if (!percpu_ref_is_dying(ref)) { |
| ret = atomic_long_inc_not_zero(&ref->count); |
| } |
| |
| rcu_read_unlock(); |
| |
| return ret; |
| } |
| #endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 0) */ |
| |
| #elif LINUX_VERSION_CODE < KERNEL_VERSION(3, 11, 0) && \ |
| (!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 7 || \ |
| RHEL_MAJOR -0 == 7 && RHEL_MINOR -0 < 5) |
| |
| struct percpu_ref; |
| typedef void (percpu_ref_func_t)(struct percpu_ref *); |
| |
| struct percpu_ref { |
| atomic_t count; |
| percpu_ref_func_t *release; |
| bool dead; |
| }; |
| |
| static inline int __must_check percpu_ref_init(struct percpu_ref *ref, |
| percpu_ref_func_t *release, unsigned int flags, |
| gfp_t gfp) |
| { |
| WARN_ON_ONCE(flags != 0); |
| atomic_set(&ref->count, 1); |
| ref->release = release; |
| ref->dead = false; |
| return 0; |
| } |
| |
| static inline void percpu_ref_exit(struct percpu_ref *ref) |
| { |
| } |
| |
| static inline void percpu_ref_get(struct percpu_ref *ref) |
| { |
| atomic_inc(&ref->count); |
| } |
| |
| static inline bool percpu_ref_tryget_live(struct percpu_ref *ref) |
| { |
| bool ret = false; |
| |
| rcu_read_lock(); |
| if (!ref->dead) |
| ret = atomic_inc_not_zero(&ref->count); |
| rcu_read_unlock(); |
| |
| return ret; |
| } |
| |
| static inline void percpu_ref_put(struct percpu_ref *ref) |
| { |
| if (unlikely(atomic_dec_and_test(&ref->count))) |
| ref->release(ref); |
| } |
| |
| static inline void percpu_ref_kill(struct percpu_ref *ref) |
| { |
| WARN_ON_ONCE(ref->dead); |
| ref->dead = true; |
| percpu_ref_put(ref); |
| } |
| |
| static inline void percpu_ref_resurrect(struct percpu_ref *ref) |
| { |
| WARN_ON_ONCE(!ref->dead); |
| ref->dead = false; |
| percpu_ref_get(ref); |
| } |
| |
| static inline bool __ref_is_percpu(struct percpu_ref *ref, |
| unsigned __percpu **percpu_countp) |
| { |
| *percpu_countp = NULL; |
| return !ref->dead; |
| } |
| |
| static inline bool percpu_ref_is_dying(struct percpu_ref *ref) |
| { |
| return ref->dead; |
| } |
| |
| static inline bool percpu_ref_is_zero(struct percpu_ref *ref) |
| { |
| return !atomic_read(&ref->count); |
| } |
| #endif |
| |
| /* Only use this function for debugging purposes. Not upstream. */ |
| static inline unsigned long percpu_ref_read(struct percpu_ref *ref) |
| { |
| percpu_count_t __percpu *percpu_count; |
| |
| /* Do not try to read the counter if it is in per-cpu mode. */ |
| if (__ref_is_percpu(ref, &percpu_count)) |
| return 0; |
| return READ_REF_COUNT(ref) - !percpu_ref_is_dying(ref); |
| } |
| |
| /* <linux/rcupdate.h> */ |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 0) && \ |
| (!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 7 || \ |
| RHEL_MAJOR -0 == 7 && RHEL_MINOR -0 < 7) |
| /* |
| * See also commit 546a9d8519ed ("rcu: Export debug_init_rcu_head() and |
| * debug_init_rcu_head()") # v3.16. |
| */ |
| static inline void init_rcu_head(struct rcu_head *head) { } |
| static inline void destroy_rcu_head(struct rcu_head *head) { } |
| #endif |
| |
| /* <linux/sched/prio.h> */ |
| |
| /* |
| * See also commit 3ee237dddcd8 ("sched/prio: Add 3 macros of MAX_NICE, |
| * MIN_NICE and NICE_WIDTH in prio.h") # v3.15. |
| */ |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 15, 0) && !defined(MIN_NICE) |
| #define MIN_NICE -20 |
| #endif |
| |
| /* <linux/seq_file.h> */ |
| |
| /* |
| * See also commit a08f06bb7a07 ("seq_file: Introduce DEFINE_SHOW_ATTRIBUTE() |
| * helper macro") # v4.16. |
| */ |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 16, 0) |
| #define DEFINE_SHOW_ATTRIBUTE(__name) \ |
| static int __name ## _open(struct inode *inode, struct file *file) \ |
| { \ |
| return single_open(file, __name ## _show, inode->i_private); \ |
| } \ |
| \ |
| static const struct file_operations __name ## _fops = { \ |
| .owner = THIS_MODULE, \ |
| .open = __name ## _open, \ |
| .read = seq_read, \ |
| .llseek = seq_lseek, \ |
| .release = single_release, \ |
| } |
| #endif |
| |
| /* <linux/slab.h> */ |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0) && \ |
| !defined(_COMPAT_LINUX_MM_H) |
| /* |
| * See also commit 3942d2991852 ("mm/slab_common: allow NULL cache pointer in |
| * kmem_cache_destroy()") # v4.3. |
| */ |
| static inline void kmem_cache_destroy_backport(struct kmem_cache *s) |
| { |
| if (s) |
| kmem_cache_destroy(s); |
| } |
| |
| #define kmem_cache_destroy kmem_cache_destroy_backport |
| #endif |
| |
| /* |
| * See also commit 8eb8284b4129 ("usercopy: Prepare for usercopy |
| * whitelisting"). |
| * |
| * UEK4 is based on kernel v4.1.12 and does not have a backport of the v4.16 |
| * API. UEK5 is based on kernel v4.14.35 and has a backport of the v4.16 API. |
| */ |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 16, 0) && \ |
| (!defined(UEK_KABI_RENAME) || \ |
| LINUX_VERSION_CODE < KERNEL_VERSION(4, 14, 0)) |
| static inline struct kmem_cache *kmem_cache_create_usercopy(const char *name, |
| unsigned int size, unsigned int align, |
| unsigned long flags, |
| unsigned int useroffset, unsigned int usersize, |
| void (*ctor)(void *)) |
| { |
| return kmem_cache_create(name, size, align, flags, ctor); |
| } |
| #endif |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 16, 0) |
| #define KMEM_CACHE_USERCOPY(__struct, __flags, __field) \ |
| kmem_cache_create_usercopy(#__struct, \ |
| sizeof(struct __struct), \ |
| __alignof__(struct __struct), (__flags), \ |
| offsetof(struct __struct, __field), \ |
| sizeof_field(struct __struct, __field), NULL) |
| #endif |
| |
| /* <linux/sockptr.h> */ |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 9, 0) |
| #if !defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 8 || \ |
| RHEL_MAJOR -0 == 8 && RHEL_MINOR -0 < 4 |
| /* See also commit ba423fdaa589 ("net: add a new sockptr_t type") # v5.9 */ |
| static inline void __user *KERNEL_SOCKPTR(void *p) |
| { |
| return (void __force __user *)p; |
| } |
| #else |
| #define KERNEL_SOCKPTR(p) ((char __force __user *)p) |
| #endif |
| #endif |
| |
| /* <linux/stddef.h> */ |
| |
| #ifndef sizeof_field |
| #define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER)) |
| #endif |
| |
| /* <linux/string.h> */ |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 5, 0) && \ |
| (!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 7) |
| /* See also commit e9d408e107db ("new helper: memdup_user_nul()") # v4.5 */ |
| static inline void *memdup_user_nul(const void __user *src, size_t len) |
| { |
| char *p; |
| |
| p = kmalloc(len + 1, GFP_KERNEL); |
| if (!p) |
| return ERR_PTR(-ENOMEM); |
| |
| if (copy_from_user(p, src, len)) { |
| kfree(p); |
| return ERR_PTR(-EFAULT); |
| } |
| p[len] = '\0'; |
| |
| return p; |
| } |
| #endif |
| |
| /* <linux/sysfs.h> */ |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 11, 0) && \ |
| (!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 7) |
| /* See also commit b9b3259746d7 ("sysfs.h: add __ATTR_RW() macro") # v3.11. */ |
| #define __ATTR_RW(_name) __ATTR(_name, 0644, _name##_show, _name##_store) |
| #endif |
| |
| /* <linux/t10-pi.h> */ |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 0) |
| struct t10_pi_tuple { |
| __be16 guard_tag; |
| __be16 app_tag; |
| __be32 ref_tag; |
| }; |
| #endif |
| |
| /* <linux/timer.h> */ |
| |
| /* |
| * See also commit 686fef928bba ("timer: Prepare to change timer callback |
| * argument type") # v4.14. See also commit 0eeda71bc30d ("timer: Replace |
| * timer base by a cpu index") # v4.2. |
| */ |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 2, 0) |
| #define timer_setup(_timer, _fn, _flags) do { \ |
| init_timer(_timer); \ |
| (_timer)->function = (void *)(_fn); \ |
| (_timer)->data = (unsigned long)(_timer); \ |
| WARN_ON_ONCE((_flags) != 0); \ |
| } while (0) |
| #elif LINUX_VERSION_CODE < KERNEL_VERSION(4, 14, 0) |
| #define timer_setup(_timer, _fn, _flags) do { \ |
| init_timer(_timer); \ |
| (_timer)->function = (void *)(_fn);\ |
| (_timer)->data = (unsigned long)(_timer); \ |
| (_timer)->flags = (_flags); \ |
| } while (0) |
| #endif |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 14, 0) |
| #define from_timer(var, callback_timer, timer_fieldname) \ |
| container_of(callback_timer, typeof(*var), timer_fieldname) |
| #endif |
| |
| /* |
| * See also commit 1d27e3e2252b ("timer: Remove expires and data arguments |
| * from DEFINE_TIMER"). |
| */ |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 15, 0) |
| #undef DEFINE_TIMER |
| #define DEFINE_TIMER(_name, _function) \ |
| struct timer_list _name = TIMER_INITIALIZER( \ |
| (void (*)(unsigned long))(unsigned long)(_function), 0, \ |
| (unsigned long)&(_name)) |
| #endif |
| |
| /* <linux/uio.h> */ |
| |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 19, 0) |
| /* See also commit abb78f875f3f ("new helper: iov_iter_kvec()") # v3.19. */ |
| static inline void |
| iov_iter_kvec_backport(struct iov_iter *i, unsigned int direction, |
| const struct kvec *kvec, unsigned long nr_segs, |
| size_t count) |
| { |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 20, 0) || \ |
| (defined(RHEL_MAJOR) && \ |
| (RHEL_MAJOR -0 > 8 || (RHEL_MAJOR -0 == 8 && RHEL_MINOR -0 >= 2))) |
| /* |
| * For iov_iter_kvec() implementations that have a WARN_ON(direction & |
| * ~(READ | WRITE)) statement. See also commit aa563d7bca6e ("iov_iter: |
| * Separate type from direction and use accessor functions") # v4.20. |
| */ |
| iov_iter_kvec(i, direction, kvec, nr_segs, count); |
| #else |
| iov_iter_kvec(i, ITER_KVEC | direction, kvec, nr_segs, count); |
| #endif |
| } |
| |
| #define iov_iter_kvec iov_iter_kvec_backport |
| #endif |
| |
| /* <linux/unaligned.h> */ |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 7, 0) && \ |
| (!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 8 || \ |
| RHEL_MAJOR -0 == 8 && RHEL_MINOR -0 < 4) |
| /* Only use get_unaligned_be24() if reading p - 1 is allowed. */ |
| static inline uint32_t get_unaligned_be24(const uint8_t *const p) |
| { |
| return get_unaligned_be32(p - 1) & 0xffffffU; |
| } |
| |
| static inline void put_unaligned_be24(const uint32_t v, uint8_t *const p) |
| { |
| p[0] = v >> 16; |
| p[1] = v >> 8; |
| p[2] = v >> 0; |
| } |
| #endif |
| |
| /* <rdma/ib_verbs.h> */ |
| |
| /* commit ed082d36 */ |
| #ifndef ib_alloc_pd |
| static inline struct ib_pd *ib_alloc_pd_backport(struct ib_device *device) |
| { |
| return ib_alloc_pd(device); |
| } |
| #define ib_alloc_pd(device, flags) \ |
| ({ \ |
| (void)(flags), ib_alloc_pd_backport(device); \ |
| }) |
| #endif |
| |
| /* <scsi/scsi.h> */ |
| |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 14, 0) |
| #ifndef msg_byte |
| /* |
| * See also commit 54cf31d07aa8 ("scsi: core: Drop message byte helper"; |
| * v5.14-rc1). |
| */ |
| static inline uint8_t msg_byte(uint32_t result) |
| { |
| return (result >> 8) & 0xff; |
| } |
| #endif |
| #ifndef host_byte |
| static inline uint8_t host_byte(uint32_t result) |
| { |
| return (result >> 16) & 0xff; |
| } |
| #endif |
| #ifndef driver_byte |
| /* |
| * See also commit 54c29086195f ("scsi: core: Drop the now obsolete driver_byte |
| * definitions"; v5.14-rc1). |
| */ |
| static inline uint8_t driver_byte(uint32_t result) |
| { |
| return (result >> 24) & 0xff; |
| } |
| #endif |
| #endif |
| |
| /* <scsi/scsi_cmnd.h> */ |
| |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 1, 0) || \ |
| (defined(RHEL_RELEASE_CODE) && \ |
| RHEL_RELEASE_CODE -0 >= RHEL_RELEASE_VERSION(8, 3)) |
| /* |
| * See also patch "[SCSI] bidirectional command support" (commit ID |
| * 6f9a35e2dafa). See also commit ae3d56d81507 ("scsi: remove bidirectional |
| * command support") # v5.1. |
| */ |
| static inline int scsi_bidi_cmnd(struct scsi_cmnd *cmd) |
| { |
| return false; |
| } |
| #endif |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 0) && \ |
| (!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 7 || \ |
| RHEL_MAJOR -0 == 7 && RHEL_MINOR -0 < 7) |
| /* See also commit b54197c43db8 ("virtio_scsi: use cmd_size") # v3.16. */ |
| static inline void *scsi_cmd_priv(struct scsi_cmnd *cmd) |
| { |
| return cmd + 1; |
| } |
| #endif |
| |
| /* |
| * The Debian 5.13.0 kernel has a scsi_build_sense() definition but does not |
| * define bio_multiple_segments() while the upstream 5.13.0 kernel defines |
| * bio_multiple_segments(). Hence the check two lines below for the Debian |
| * kernel. |
| */ |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 14, 0) && \ |
| (LINUX_VERSION_CODE >> 8 != KERNEL_VERSION(5, 13, 0) >> 8 || \ |
| defined(bio_multiple_segments)) |
| /* |
| * See also commit f2b1e9c6f867 ("scsi: core: Introduce scsi_build_sense()"; |
| * v5.14-rc1). |
| */ |
| static inline void scsi_build_sense(struct scsi_cmnd *scmd, int desc, |
| u8 key, u8 asc, u8 ascq) |
| { |
| scsi_build_sense_buffer(desc, scmd->sense_buffer, key, asc, ascq); |
| scmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; |
| } |
| #endif |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 15, 0) && \ |
| (!defined(RHEL_RELEASE_CODE) || \ |
| RHEL_RELEASE_CODE -0 < RHEL_RELEASE_VERSION(8, 7) || \ |
| RHEL_RELEASE_CODE -0 == RHEL_RELEASE_VERSION(9, 0)) |
| /* |
| * See also 51f3a4788928 ("scsi: core: Introduce the scsi_cmd_to_rq() |
| * function"). |
| */ |
| static inline struct request *scsi_cmd_to_rq(struct scsi_cmnd *scmd) |
| { |
| return scmd->request; |
| } |
| #endif |
| |
| /* |
| * See also commits 7ba46799d346 ("scsi: core: Add scsi_prot_ref_tag() |
| * helper") and ddd0bc756983 ("block: move ref_tag calculation func to the |
| * block layer"; v4.19). |
| */ |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 15, 0) && \ |
| (!defined(RHEL_RELEASE_CODE) || \ |
| RHEL_RELEASE_CODE -0 < RHEL_RELEASE_VERSION(9, 1)) |
| |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 19, 0) || \ |
| (defined(RHEL_RELEASE_CODE) && \ |
| RHEL_RELEASE_CODE -0 < RHEL_RELEASE_VERSION(8, 7)) |
| static inline u32 scsi_prot_ref_tag(struct scsi_cmnd *scmd) |
| { |
| #if defined(RHEL_MAJOR) && RHEL_MAJOR -0 == 7 |
| WARN_ON_ONCE(true); |
| return 0; |
| #else |
| struct request *rq = blk_mq_rq_from_pdu(scmd); |
| |
| return t10_pi_ref_tag(rq); |
| #endif |
| } |
| #endif |
| #endif |
| |
| /* |
| * See also commit c611529e7cd3 ("sd: Honor block layer integrity handling |
| * flags"; v3.18). |
| */ |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 0) |
| static inline unsigned int scsi_prot_interval(struct scsi_cmnd *scmd) |
| { |
| /* To do: backport this function properly. */ |
| WARN_ON_ONCE(true); |
| return 512; |
| } |
| #endif |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 16, 0) && \ |
| (!defined(RHEL_RELEASE_CODE) || \ |
| RHEL_RELEASE_CODE -0 < RHEL_RELEASE_VERSION(9, 1)) |
| /* |
| * See also commit 11b68e36b167 ("scsi: core: Call scsi_done directly"; v5.16) |
| */ |
| static inline void scsi_done(struct scsi_cmnd *cmd) |
| { |
| return cmd->scsi_done(cmd); |
| } |
| #endif |
| |
| /* <scsi/scsi_request.h> */ |
| |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 18, 0) |
| /* |
| * See also commit 6aded12b10e0 ("scsi: core: Remove struct scsi_request") # v5.18 |
| */ |
| static inline struct scsi_cmnd *scsi_req(struct request *rq) |
| { |
| return blk_mq_rq_to_pdu(rq); |
| } |
| |
| #define SREQ_SENSE(req) ((req)->sense_buffer) |
| #define SREQ_CP(req) ((req)->cmnd) |
| #else |
| #define SREQ_SENSE(req) ((req)->sense) |
| #define SREQ_CP(req) ((req)->cmd) |
| #endif |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 11, 0) |
| static inline struct request *scsi_req(struct request *rq) |
| { |
| return rq; |
| } |
| |
| static inline void scsi_req_init(struct request *rq) |
| { |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 0) |
| rq->cmd_type = REQ_TYPE_BLOCK_PC; |
| rq->__data_len = 0; |
| rq->__sector = (sector_t) -1; |
| rq->bio = rq->biotail = NULL; |
| memset(rq->__cmd, 0, sizeof(rq->__cmd)); |
| rq->cmd = rq->__cmd; |
| #else |
| return blk_rq_set_block_pc(rq); |
| #endif |
| } |
| #endif |
| |
| /* <linux/bsg-lib.h> */ |
| |
| /* |
| * Note: the function bsg_job_sense() exists only in SCST but not in any |
| * upstream kernel. |
| */ |
| #if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0) && \ |
| !defined(CONFIG_SUSE_KERNEL)) || \ |
| (LINUX_VERSION_CODE < KERNEL_VERSION(4, 4, 0) && \ |
| defined(CONFIG_SUSE_KERNEL)) |
| static inline void *bsg_job_sense(struct fc_bsg_job *job) |
| { |
| return job->req->sense; |
| } |
| #else |
| static inline void *bsg_job_sense(struct bsg_job *job) |
| { |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 11, 0) |
| return job->req->sense; |
| #elif LINUX_VERSION_CODE < KERNEL_VERSION(4, 17, 0) && \ |
| !defined(CONFIG_SUSE_KERNEL) |
| return scsi_req(job->req)->sense; |
| #else |
| return SREQ_SENSE(scsi_req(blk_mq_rq_from_pdu(job))); |
| #endif |
| } |
| #endif |
| |
| /* <scsi/scsi_transport_fc.h> */ |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 15, 0) && \ |
| (!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 6) |
| /* |
| * See also commit 624f28be8109 ("[SCSI] scsi_transport_fc: Add 32Gbps speed |
| * definition.") # v3.15. |
| */ |
| enum { |
| FC_PORTSPEED_32GBIT = 0x40 |
| }; |
| #endif |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 16, 0) && \ |
| !defined(FC_PORTSPEED_64GBIT) |
| /* |
| * See also commit cc019a5a3b58 ("scsi: scsi_transport_fc: fix typos on 64/128 |
| * GBit define names") # v4.16. |
| */ |
| #define FC_PORTSPEED_64GBIT 0x1000 |
| #endif |
| |
| #ifndef FC_PORT_ROLE_UNKNOWN |
| #define FC_PORT_ROLE_UNKNOWN 0x00 |
| #define FC_PORT_ROLE_FCP_TARGET 0x01 |
| #define FC_PORT_ROLE_FCP_INITIATOR 0x02 |
| #define FC_PORT_ROLE_IP_PORT 0x04 |
| #endif |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0) |
| /* |
| * See also commit d6d20012e116 ("nvme-fabrics: Add FC transport LLDD api |
| * definitions") # v4.10. |
| */ |
| #define FC_PORT_ROLE_NVME_INITIATOR 0x10 |
| #define FC_PORT_ROLE_NVME_TARGET 0x20 |
| #define FC_PORT_ROLE_NVME_DISCOVERY 0x40 |
| #endif |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0) |
| #define wwn_to_u64(wwn) get_unaligned_be64(wwn) |
| #endif |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(6, 3, 0) && \ |
| (!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 8 || \ |
| RHEL_MAJOR -0 == 8 && RHEL_MINOR -0 < 9 || \ |
| RHEL_MAJOR -0 == 9 && RHEL_MINOR -0 < 3) |
| /* |
| * See also commit 64fd2ba977b1 ("scsi: scsi_transport_fc: Add an additional |
| * flag to fc_host_fpin_rcv()") # v6.3 |
| */ |
| static inline void |
| fc_host_fpin_rcv_backport(struct Scsi_Host *shost, u32 fpin_len, char *fpin_buf, |
| u8 event_acknowledge) |
| { |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0) && \ |
| (!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 8 || \ |
| RHEL_MAJOR -0 == 8 && RHEL_MINOR -0 < 2) |
| /* |
| * See also commit c39e0af64bce ("scsi: scsi_transport_fc: Add FPIN fc event |
| * codes") # v5.2 |
| */ |
| return; |
| #else |
| return fc_host_fpin_rcv(shost, fpin_len, fpin_buf); |
| #endif |
| } |
| |
| #define fc_host_fpin_rcv fc_host_fpin_rcv_backport |
| #endif |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 14, 0) |
| /* |
| * See also commit 67b465250e04 ("scsi: fc: start decoupling fc_block_scsi_eh |
| * from scsi_cmnd"; v4.14). |
| */ |
| static inline int fc_block_rport(struct fc_rport *rport) |
| { |
| /* To do: backport this function. */ |
| WARN_ON_ONCE(true); |
| return 0; |
| } |
| #endif |
| |
| /* <uapi/scsi/fc/fc_els.h> */ |
| |
| /* See also commit a7dff3ad4787 ("scsi: fc: add FPIN ELS definition") # v5.2 */ |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0) && \ |
| (!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 8 || \ |
| (RHEL_MAJOR -0 == 8 && RHEL_MINOR -0 < 2)) |
| #define ELS_FPIN 0x16 |
| #endif |
| |
| /* |
| * See also commit 62e9dd177732 ("scsi: qla2xxx: Change in PUREX to handle FPIN |
| * ELS requests"). |
| */ |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 9, 0) && \ |
| (!defined(RHEL_MAJOR) || RHEL_MAJOR -0 < 8 || \ |
| RHEL_MAJOR -0 == 8 && RHEL_MINOR -0 < 4) && \ |
| !(defined(UEK_KABI_RENAME) && defined(FC_PORTSPEED_256GBIT)) |
| #define ELS_RDP 0x18 |
| #endif |
| |
| /* <target/target_core_base.h> */ |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 19, 0) |
| /* See also commit 68d81f40047c ("scsi: remove MSG_*_TAG defines") # v3.19. */ |
| #define TCM_SIMPLE_TAG 0x20 |
| #define TCM_HEAD_TAG 0x21 |
| #define TCM_ORDERED_TAG 0x22 |
| #define TCM_ACA_TAG 0x24 |
| #endif |
| |
| #endif /* _SCST_BACKPORT_H_ */ |