include/linux/bio.h

   1 /*
   2  * 2.5 block I/O model
   3  *
   4  * Copyright (C) 2001 Jens Axboe <axboe@suse.de>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public Licens
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-
  19  */
  20 #ifndef __LINUX_BIO_H
  21 #define __LINUX_BIO_H
  22
  23 #include <linux/highmem.h>
  24 #include <linux/mempool.h>
  25 #include <linux/ioprio.h>
  26 #include <linux/bug.h>
  27
  28 #ifdef CONFIG_BLOCK
  29
  30 #include <asm/io.h>
  31
  32 /* struct bio, bio_vec and BIO_* flags are defined in blk_types.h */
  33 #include <linux/blk_types.h>
  34
  35 #define BIO_DEBUG
  36
  37 #ifdef BIO_DEBUG
  38 #define BIO_BUG_ON      BUG_ON
  39 #else
  40 #define BIO_BUG_ON
  41 #endif
  42
  43 #define BIO_MAX_PAGES           256
  44 #define BIO_MAX_SIZE            (BIO_MAX_PAGES << PAGE_CACHE_SHIFT)
  45 #define BIO_MAX_SECTORS         (BIO_MAX_SIZE >> 9)
  46
  47 /*
  48  * upper 16 bits of bi_rw define the io priority of this bio
  49  */
  50 #define BIO_PRIO_SHIFT  (8 * sizeof(unsigned long) - IOPRIO_BITS)
  51 #define bio_prio(bio)   ((bio)->bi_rw >> BIO_PRIO_SHIFT)
  52 #define bio_prio_valid(bio)     ioprio_valid(bio_prio(bio))
  53
  54 #define bio_set_prio(bio, prio)         do {                    \
  55         WARN_ON(prio >= (1 << IOPRIO_BITS));                    \
  56         (bio)->bi_rw &= ((1UL << BIO_PRIO_SHIFT) - 1);          \
  57         (bio)->bi_rw |= ((unsigned long) (prio) << BIO_PRIO_SHIFT);     \
  58 } while (0)
  59
  60 /*
  61  * various member access, note that bio_data should of course not be used
  62  * on highmem page vectors
  63  */
  64 #define bio_iovec_idx(bio, idx) (&((bio)->bi_io_vec[(idx)]))
  65 #define bio_iovec(bio)          bio_iovec_idx((bio), (bio)->bi_idx)
  66 #define bio_page(bio)           bio_iovec((bio))->bv_page
  67 #define bio_offset(bio)         bio_iovec((bio))->bv_offset
  68 #define bio_segments(bio)       ((bio)->bi_vcnt - (bio)->bi_idx)
  69 #define bio_sectors(bio)        ((bio)->bi_size >> 9)
  70 #define bio_end_sector(bio)     ((bio)->bi_sector + bio_sectors((bio)))
  71
  72 static inline unsigned int bio_cur_bytes(struct bio *bio)
  73 {
  74         if (bio->bi_vcnt)
  75                 return bio_iovec(bio)->bv_len;
  76         else /* dataless requests such as discard */
  77                 return bio->bi_size;
  78 }
  79
  80 static inline void *bio_data(struct bio *bio)
  81 {
  82         if (bio->bi_vcnt)
  83                 return page_address(bio_page(bio)) + bio_offset(bio);
  84
  85         return NULL;
  86 }
  87
  88 /*
  89  * will die
  90  */
  91 #define bio_to_phys(bio)        (page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio)))
  92 #define bvec_to_phys(bv)        (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset)
  93
  94 /*
  95  * queues that have highmem support enabled may still need to revert to
  96  * PIO transfers occasionally and thus map high pages temporarily. For
  97  * permanent PIO fall back, user is probably better off disabling highmem
  98  * I/O completely on that queue (see ide-dma for example)
  99  */
 100 #define __bio_kmap_atomic(bio, idx)                             \
 101         (kmap_atomic(bio_iovec_idx((bio), (idx))->bv_page) +    \
 102                 bio_iovec_idx((bio), (idx))->bv_offset)
 103
 104 #define __bio_kunmap_atomic(addr) kunmap_atomic(addr)
 105
 106 /*
 107  * merge helpers etc
 108  */
 109
 110 #define __BVEC_END(bio)         bio_iovec_idx((bio), (bio)->bi_vcnt - 1)
 111 #define __BVEC_START(bio)       bio_iovec_idx((bio), (bio)->bi_idx)
 112
 113 /* Default implementation of BIOVEC_PHYS_MERGEABLE */
 114 #define __BIOVEC_PHYS_MERGEABLE(vec1, vec2)     \
 115         ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
 116
 117 /*
 118  * allow arch override, for eg virtualized architectures (put in asm/io.h)
 119  */
 120 #ifndef BIOVEC_PHYS_MERGEABLE
 121 #define BIOVEC_PHYS_MERGEABLE(vec1, vec2)       \
 122         __BIOVEC_PHYS_MERGEABLE(vec1, vec2)
 123 #endif
 124
 125 #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \
 126         (((addr1) | (mask)) == (((addr2) - 1) | (mask)))
 127 #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \
 128         __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q)))
 129 #define BIO_SEG_BOUNDARY(q, b1, b2) \
 130         BIOVEC_SEG_BOUNDARY((q), __BVEC_END((b1)), __BVEC_START((b2)))
 131
 132 #define bio_io_error(bio) bio_endio((bio), -EIO)
 133
 134 /*
 135  * drivers should not use the __ version unless they _really_ know what
 136  * they're doing
 137  */
 138 #define __bio_for_each_segment(bvl, bio, i, start_idx)                  \
 139         for (bvl = bio_iovec_idx((bio), (start_idx)), i = (start_idx);  \
 140              i < (bio)->bi_vcnt;                                        \
 141              bvl++, i++)
 142
 143 /*
 144  * drivers should _never_ use the all version - the bio may have been split
 145  * before it got to the driver and the driver won't own all of it
 146  */
 147 #define bio_for_each_segment_all(bvl, bio, i)                           \
 148         for (i = 0;                                                     \
 149              bvl = bio_iovec_idx((bio), (i)), i < (bio)->bi_vcnt;       \
 150              i++)
 151
 152 #define bio_for_each_segment(bvl, bio, i)                               \
 153         for (i = (bio)->bi_idx;                                         \
 154              bvl = bio_iovec_idx((bio), (i)), i < (bio)->bi_vcnt;       \
 155              i++)
 156
 157 /*
 158  * get a reference to a bio, so it won't disappear. the intended use is
 159  * something like:
 160  *
 161  * bio_get(bio);
 162  * submit_bio(rw, bio);
 163  * if (bio->bi_flags ...)
 164  *      do_something
 165  * bio_put(bio);
 166  *
 167  * without the bio_get(), it could potentially complete I/O before submit_bio
 168  * returns. and then bio would be freed memory when if (bio->bi_flags ...)
 169  * runs
 170  */
 171 #define bio_get(bio)    atomic_inc(&(bio)->bi_cnt)
 172
 173 #if defined(CONFIG_BLK_DEV_INTEGRITY)
 174 /*
 175  * bio integrity payload
 176  */
 177 struct bio_integrity_payload {
 178         struct bio              *bip_bio;       /* parent bio */
 179
 180         sector_t                bip_sector;     /* virtual start sector */
 181
 182         void                    *bip_buf;       /* generated integrity data */
 183         bio_end_io_t            *bip_end_io;    /* saved I/O completion fn */
 184
 185         unsigned int            bip_size;
 186
 187         unsigned short          bip_slab;       /* slab the bip came from */
 188         unsigned short          bip_vcnt;       /* # of integrity bio_vecs */
 189         unsigned short          bip_idx;        /* current bip_vec index */
 190         unsigned                bip_owns_buf:1; /* should free bip_buf */
 191
 192         struct work_struct      bip_work;       /* I/O completion */
 193
 194         struct bio_vec          *bip_vec;
 195         struct bio_vec          bip_inline_vecs[0];/* embedded bvec array */
 196 };
 197 #endif /* CONFIG_BLK_DEV_INTEGRITY */
 198
 199 /*
 200  * A bio_pair is used when we need to split a bio.
 201  * This can only happen for a bio that refers to just one
 202  * page of data, and in the unusual situation when the
 203  * page crosses a chunk/device boundary
 204  *
 205  * The address of the master bio is stored in bio1.bi_private
 206  * The address of the pool the pair was allocated from is stored
 207  *   in bio2.bi_private
 208  */
 209 struct bio_pair {
 210         struct bio                      bio1, bio2;
 211         struct bio_vec                  bv1, bv2;
 212 #if defined(CONFIG_BLK_DEV_INTEGRITY)
 213         struct bio_integrity_payload    bip1, bip2;
 214         struct bio_vec                  iv1, iv2;
 215 #endif
 216         atomic_t                        cnt;
 217         int                             error;
 218 };
 219 extern struct bio_pair *bio_split(struct bio *bi, int first_sectors);
 220 extern void bio_pair_release(struct bio_pair *dbio);
 221
 222 extern struct bio_set *bioset_create(unsigned int, unsigned int);
 223 extern void bioset_free(struct bio_set *);
 224 extern mempool_t *biovec_create_pool(struct bio_set *bs, int pool_entries);
 225
 226 extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *);
 227 extern void bio_put(struct bio *);
 228
 229 extern void __bio_clone(struct bio *, struct bio *);
 230 extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs);
 231
 232 extern struct bio_set *fs_bio_set;
 233
 234 static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs)
 235 {
 236         return bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set);
 237 }
 238
 239 static inline struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask)
 240 {
 241         return bio_clone_bioset(bio, gfp_mask, fs_bio_set);
 242 }
 243
 244 static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs)
 245 {
 246         return bio_alloc_bioset(gfp_mask, nr_iovecs, NULL);
 247 }
 248
 249 static inline struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask)
 250 {
 251         return bio_clone_bioset(bio, gfp_mask, NULL);
 252
 253 }
 254
 255 extern void bio_endio(struct bio *, int);
 256 struct request_queue;
 257 extern int bio_phys_segments(struct request_queue *, struct bio *);
 258
 259 extern int submit_bio_wait(int rw, struct bio *bio);
 260 extern void bio_advance(struct bio *, unsigned);
 261
 262 extern void bio_init(struct bio *);
 263 extern void bio_reset(struct bio *);
 264
 265 extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int);
 266 extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *,
 267                            unsigned int, unsigned int);
 268 extern int bio_get_nr_vecs(struct block_device *);
 269 extern sector_t bio_sector_offset(struct bio *, unsigned short, unsigned int);
 270 extern struct bio *bio_map_user(struct request_queue *, struct block_device *,
 271                                 unsigned long, unsigned int, int, gfp_t);
 272 struct sg_iovec;
 273 struct rq_map_data;
 274 extern struct bio *bio_map_user_iov(struct request_queue *,
 275                                     struct block_device *,
 276                                     struct sg_iovec *, int, int, gfp_t);
 277 extern void bio_unmap_user(struct bio *);
 278 extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int,
 279                                 gfp_t);
 280 extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int,
 281                                  gfp_t, int);
 282 extern void bio_set_pages_dirty(struct bio *bio);
 283 extern void bio_check_pages_dirty(struct bio *bio);
 284
 285 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
 286 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
 287 #endif
 288 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
 289 extern void bio_flush_dcache_pages(struct bio *bi);
 290 #else
 291 static inline void bio_flush_dcache_pages(struct bio *bi)
 292 {
 293 }
 294 #endif
 295
 296 extern void bio_copy_data(struct bio *dst, struct bio *src);
 297 extern int bio_alloc_pages(struct bio *bio, gfp_t gfp);
 298
 299 extern struct bio *bio_copy_user(struct request_queue *, struct rq_map_data *,
 300                                  unsigned long, unsigned int, int, gfp_t);
 301 extern struct bio *bio_copy_user_iov(struct request_queue *,
 302                                      struct rq_map_data *, struct sg_iovec *,
 303                                      int, int, gfp_t);
 304 extern int bio_uncopy_user(struct bio *);
 305 void zero_fill_bio(struct bio *bio);
 306 extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *);
 307 extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int);
 308 extern unsigned int bvec_nr_vecs(unsigned short idx);
 309
 310 #ifdef CONFIG_BLK_CGROUP
 311 int bio_associate_current(struct bio *bio);
 312 void bio_disassociate_task(struct bio *bio);
 313 #else   /* CONFIG_BLK_CGROUP */
 314 static inline int bio_associate_current(struct bio *bio) { return -ENOENT; }
 315 static inline void bio_disassociate_task(struct bio *bio) { }
 316 #endif  /* CONFIG_BLK_CGROUP */
 317
 318 #ifdef CONFIG_HIGHMEM
 319 /*
 320  * remember never ever reenable interrupts between a bvec_kmap_irq and
 321  * bvec_kunmap_irq!
 322  */
 323 static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags)
 324 {
 325         unsigned long addr;
 326
 327         /*
 328          * might not be a highmem page, but the preempt/irq count
 329          * balancing is a lot nicer this way
 330          */
 331         local_irq_save(*flags);
 332         addr = (unsigned long) kmap_atomic(bvec->bv_page);
 333
 334         BUG_ON(addr & ~PAGE_MASK);
 335
 336         return (char *) addr + bvec->bv_offset;
 337 }
 338
 339 static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags)
 340 {
 341         unsigned long ptr = (unsigned long) buffer & PAGE_MASK;
 342
 343         kunmap_atomic((void *) ptr);
 344         local_irq_restore(*flags);
 345 }
 346
 347 #else
 348 static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags)
 349 {
 350         return page_address(bvec->bv_page) + bvec->bv_offset;
 351 }
 352
 353 static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags)
 354 {
 355         *flags = 0;
 356 }
 357 #endif
 358
 359 static inline char *__bio_kmap_irq(struct bio *bio, unsigned short idx,
 360                                    unsigned long *flags)
 361 {
 362         return bvec_kmap_irq(bio_iovec_idx(bio, idx), flags);
 363 }
 364 #define __bio_kunmap_irq(buf, flags)    bvec_kunmap_irq(buf, flags)
 365
 366 #define bio_kmap_irq(bio, flags) \
 367         __bio_kmap_irq((bio), (bio)->bi_idx, (flags))
 368 #define bio_kunmap_irq(buf,flags)       __bio_kunmap_irq(buf, flags)
 369
 370 /*
 371  * Check whether this bio carries any data or not. A NULL bio is allowed.
 372  */
 373 static inline bool bio_has_data(struct bio *bio)
 374 {
 375         if (bio && bio->bi_vcnt)
 376                 return true;
 377
 378         return false;
 379 }
 380
 381 static inline bool bio_is_rw(struct bio *bio)
 382 {
 383         if (!bio_has_data(bio))
 384                 return false;
 385
 386         if (bio->bi_rw & REQ_WRITE_SAME)
 387                 return false;
 388
 389         return true;
 390 }
 391
 392 static inline bool bio_mergeable(struct bio *bio)
 393 {
 394         if (bio->bi_rw & REQ_NOMERGE_FLAGS)
 395                 return false;
 396
 397         return true;
 398 }
 399
 400 /*
 401  * BIO list management for use by remapping drivers (e.g. DM or MD) and loop.
 402  *
 403  * A bio_list anchors a singly-linked list of bios chained through the bi_next
 404  * member of the bio.  The bio_list also caches the last list member to allow
 405  * fast access to the tail.
 406  */
 407 struct bio_list {
 408         struct bio *head;
 409         struct bio *tail;
 410 };
 411
 412 static inline int bio_list_empty(const struct bio_list *bl)
 413 {
 414         return bl->head == NULL;
 415 }
 416
 417 static inline void bio_list_init(struct bio_list *bl)
 418 {
 419         bl->head = bl->tail = NULL;
 420 }
 421
 422 #define bio_list_for_each(bio, bl) \
 423         for (bio = (bl)->head; bio; bio = bio->bi_next)
 424
 425 static inline unsigned bio_list_size(const struct bio_list *bl)
 426 {
 427         unsigned sz = 0;
 428         struct bio *bio;
 429
 430         bio_list_for_each(bio, bl)
 431                 sz++;
 432
 433         return sz;
 434 }
 435
 436 static inline void bio_list_add(struct bio_list *bl, struct bio *bio)
 437 {
 438         bio->bi_next = NULL;
 439
 440         if (bl->tail)
 441                 bl->tail->bi_next = bio;
 442         else
 443                 bl->head = bio;
 444
 445         bl->tail = bio;
 446 }
 447
 448 static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio)
 449 {
 450         bio->bi_next = bl->head;
 451
 452         bl->head = bio;
 453
 454         if (!bl->tail)
 455                 bl->tail = bio;
 456 }
 457
 458 static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2)
 459 {
 460         if (!bl2->head)
 461                 return;
 462
 463         if (bl->tail)
 464                 bl->tail->bi_next = bl2->head;
 465         else
 466                 bl->head = bl2->head;
 467
 468         bl->tail = bl2->tail;
 469 }
 470
 471 static inline void bio_list_merge_head(struct bio_list *bl,
 472                                        struct bio_list *bl2)
 473 {
 474         if (!bl2->head)
 475                 return;
 476
 477         if (bl->head)
 478                 bl2->tail->bi_next = bl->head;
 479         else
 480                 bl->tail = bl2->tail;
 481
 482         bl->head = bl2->head;
 483 }
 484
 485 static inline struct bio *bio_list_peek(struct bio_list *bl)
 486 {
 487         return bl->head;
 488 }
 489
 490 static inline struct bio *bio_list_pop(struct bio_list *bl)
 491 {
 492         struct bio *bio = bl->head;
 493
 494         if (bio) {
 495                 bl->head = bl->head->bi_next;
 496                 if (!bl->head)
 497                         bl->tail = NULL;
 498
 499                 bio->bi_next = NULL;
 500         }
 501
 502         return bio;
 503 }
 504
 505 static inline struct bio *bio_list_get(struct bio_list *bl)
 506 {
 507         struct bio *bio = bl->head;
 508
 509         bl->head = bl->tail = NULL;
 510
 511         return bio;
 512 }
 513
 514 /*
 515  * bio_set is used to allow other portions of the IO system to
 516  * allocate their own private memory pools for bio and iovec structures.
 517  * These memory pools in turn all allocate from the bio_slab
 518  * and the bvec_slabs[].
 519  */
 520 #define BIO_POOL_SIZE 2
 521 #define BIOVEC_NR_POOLS 6
 522 #define BIOVEC_MAX_IDX  (BIOVEC_NR_POOLS - 1)
 523
 524 struct bio_set {
 525         struct kmem_cache *bio_slab;
 526         unsigned int front_pad;
 527
 528         mempool_t *bio_pool;
 529         mempool_t *bvec_pool;
 530 #if defined(CONFIG_BLK_DEV_INTEGRITY)
 531         mempool_t *bio_integrity_pool;
 532         mempool_t *bvec_integrity_pool;
 533 #endif
 534
 535         /*
 536          * Deadlock avoidance for stacking block drivers: see comments in
 537          * bio_alloc_bioset() for details
 538          */
 539         spinlock_t              rescue_lock;
 540         struct bio_list         rescue_list;
 541         struct work_struct      rescue_work;
 542         struct workqueue_struct *rescue_workqueue;
 543 };
 544
 545 struct biovec_slab {
 546         int nr_vecs;
 547         char *name;
 548         struct kmem_cache *slab;
 549 };
 550
 551 /*
 552  * a small number of entries is fine, not going to be performance critical.
 553  * basically we just need to survive
 554  */
 555 #define BIO_SPLIT_ENTRIES 2
 556
 557 #if defined(CONFIG_BLK_DEV_INTEGRITY)
 558
 559 #define bip_vec_idx(bip, idx)   (&(bip->bip_vec[(idx)]))
 560 #define bip_vec(bip)            bip_vec_idx(bip, 0)
 561
 562 #define __bip_for_each_vec(bvl, bip, i, start_idx)                      \
 563         for (bvl = bip_vec_idx((bip), (start_idx)), i = (start_idx);    \
 564              i < (bip)->bip_vcnt;                                       \
 565              bvl++, i++)
 566
 567 #define bip_for_each_vec(bvl, bip, i)                                   \
 568         __bip_for_each_vec(bvl, bip, i, (bip)->bip_idx)
 569
 570 #define bio_for_each_integrity_vec(_bvl, _bio, _iter)                   \
 571         for_each_bio(_bio)                                              \
 572                 bip_for_each_vec(_bvl, _bio->bi_integrity, _iter)
 573
 574 #define bio_integrity(bio) (bio->bi_integrity != NULL)
 575
 576 extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int);
 577 extern void bio_integrity_free(struct bio *);
 578 extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int);
 579 extern int bio_integrity_enabled(struct bio *bio);
 580 extern int bio_integrity_set_tag(struct bio *, void *, unsigned int);
 581 extern int bio_integrity_get_tag(struct bio *, void *, unsigned int);
 582 extern int bio_integrity_prep(struct bio *);
 583 extern void bio_integrity_endio(struct bio *, int);
 584 extern void bio_integrity_advance(struct bio *, unsigned int);
 585 extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int);
 586 extern void bio_integrity_split(struct bio *, struct bio_pair *, int);
 587 extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t);
 588 extern int bioset_integrity_create(struct bio_set *, int);
 589 extern void bioset_integrity_free(struct bio_set *);
 590 extern void bio_integrity_init(void);
 591
 592 #else /* CONFIG_BLK_DEV_INTEGRITY */
 593
 594 static inline int bio_integrity(struct bio *bio)
 595 {
 596         return 0;
 597 }
 598
 599 static inline int bio_integrity_enabled(struct bio *bio)
 600 {
 601         return 0;
 602 }
 603
 604 static inline int bioset_integrity_create(struct bio_set *bs, int pool_size)
 605 {
 606         return 0;
 607 }
 608
 609 static inline void bioset_integrity_free (struct bio_set *bs)
 610 {
 611         return;
 612 }
 613
 614 static inline int bio_integrity_prep(struct bio *bio)
 615 {
 616         return 0;
 617 }
 618
 619 static inline void bio_integrity_free(struct bio *bio)
 620 {
 621         return;
 622 }
 623
 624 static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src,
 625                                       gfp_t gfp_mask)
 626 {
 627         return 0;
 628 }
 629
 630 static inline void bio_integrity_split(struct bio *bio, struct bio_pair *bp,
 631                                        int sectors)
 632 {
 633         return;
 634 }
 635
 636 static inline void bio_integrity_advance(struct bio *bio,
 637                                          unsigned int bytes_done)
 638 {
 639         return;
 640 }
 641
 642 static inline void bio_integrity_trim(struct bio *bio, unsigned int offset,
 643                                       unsigned int sectors)
 644 {
 645         return;
 646 }
 647
 648 static inline void bio_integrity_init(void)
 649 {
 650         return;
 651 }
 652
 653 #endif /* CONFIG_BLK_DEV_INTEGRITY */
 654
 655 #endif /* CONFIG_BLOCK */
 656 #endif /* __LINUX_BIO_H */