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 static inline int bio_has_allocated_vec(struct bio *bio)
  89 {
  90         return bio->bi_io_vec && bio->bi_io_vec != bio->bi_inline_vecs;
  91 }
  92
  93 /*
  94  * will die
  95  */
  96 #define bio_to_phys(bio)        (page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio)))
  97 #define bvec_to_phys(bv)        (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset)
  98
  99 /*
 100  * queues that have highmem support enabled may still need to revert to
 101  * PIO transfers occasionally and thus map high pages temporarily. For
 102  * permanent PIO fall back, user is probably better off disabling highmem
 103  * I/O completely on that queue (see ide-dma for example)
 104  */
 105 #define __bio_kmap_atomic(bio, idx, kmtype)                             \
 106         (kmap_atomic(bio_iovec_idx((bio), (idx))->bv_page) +    \
 107                 bio_iovec_idx((bio), (idx))->bv_offset)
 108
 109 #define __bio_kunmap_atomic(addr, kmtype) kunmap_atomic(addr)
 110
 111 /*
 112  * merge helpers etc
 113  */
 114
 115 #define __BVEC_END(bio)         bio_iovec_idx((bio), (bio)->bi_vcnt - 1)
 116 #define __BVEC_START(bio)       bio_iovec_idx((bio), (bio)->bi_idx)
 117
 118 /* Default implementation of BIOVEC_PHYS_MERGEABLE */
 119 #define __BIOVEC_PHYS_MERGEABLE(vec1, vec2)     \
 120         ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
 121
 122 /*
 123  * allow arch override, for eg virtualized architectures (put in asm/io.h)
 124  */
 125 #ifndef BIOVEC_PHYS_MERGEABLE
 126 #define BIOVEC_PHYS_MERGEABLE(vec1, vec2)       \
 127         __BIOVEC_PHYS_MERGEABLE(vec1, vec2)
 128 #endif
 129
 130 #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \
 131         (((addr1) | (mask)) == (((addr2) - 1) | (mask)))
 132 #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \
 133         __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q)))
 134 #define BIO_SEG_BOUNDARY(q, b1, b2) \
 135         BIOVEC_SEG_BOUNDARY((q), __BVEC_END((b1)), __BVEC_START((b2)))
 136
 137 #define bio_io_error(bio) bio_endio((bio), -EIO)
 138
 139 /*
 140  * drivers should not use the __ version unless they _really_ know what
 141  * they're doing
 142  */
 143 #define __bio_for_each_segment(bvl, bio, i, start_idx)                  \
 144         for (bvl = bio_iovec_idx((bio), (start_idx)), i = (start_idx);  \
 145              i < (bio)->bi_vcnt;                                        \
 146              bvl++, i++)
 147
 148 /*
 149  * drivers should _never_ use the all version - the bio may have been split
 150  * before it got to the driver and the driver won't own all of it
 151  */
 152 #define bio_for_each_segment_all(bvl, bio, i)                           \
 153         for (i = 0;                                                     \
 154              bvl = bio_iovec_idx((bio), (i)), i < (bio)->bi_vcnt;       \
 155              i++)
 156
 157 #define bio_for_each_segment(bvl, bio, i)                               \
 158         for (i = (bio)->bi_idx;                                         \
 159              bvl = bio_iovec_idx((bio), (i)), i < (bio)->bi_vcnt;       \
 160              i++)
 161
 162 /*
 163  * get a reference to a bio, so it won't disappear. the intended use is
 164  * something like:
 165  *
 166  * bio_get(bio);
 167  * submit_bio(rw, bio);
 168  * if (bio->bi_flags ...)
 169  *      do_something
 170  * bio_put(bio);
 171  *
 172  * without the bio_get(), it could potentially complete I/O before submit_bio
 173  * returns. and then bio would be freed memory when if (bio->bi_flags ...)
 174  * runs
 175  */
 176 #define bio_get(bio)    atomic_inc(&(bio)->bi_cnt)
 177
 178 #if defined(CONFIG_BLK_DEV_INTEGRITY)
 179 /*
 180  * bio integrity payload
 181  */
 182 struct bio_integrity_payload {
 183         struct bio              *bip_bio;       /* parent bio */
 184
 185         sector_t                bip_sector;     /* virtual start sector */
 186
 187         void                    *bip_buf;       /* generated integrity data */
 188         bio_end_io_t            *bip_end_io;    /* saved I/O completion fn */
 189
 190         unsigned int            bip_size;
 191
 192         unsigned short          bip_slab;       /* slab the bip came from */
 193         unsigned short          bip_vcnt;       /* # of integrity bio_vecs */
 194         unsigned short          bip_idx;        /* current bip_vec index */
 195
 196         struct work_struct      bip_work;       /* I/O completion */
 197
 198         struct bio_vec          *bip_vec;
 199         struct bio_vec          bip_inline_vecs[0];/* embedded bvec array */
 200 };
 201 #endif /* CONFIG_BLK_DEV_INTEGRITY */
 202
 203 /*
 204  * A bio_pair is used when we need to split a bio.
 205  * This can only happen for a bio that refers to just one
 206  * page of data, and in the unusual situation when the
 207  * page crosses a chunk/device boundary
 208  *
 209  * The address of the master bio is stored in bio1.bi_private
 210  * The address of the pool the pair was allocated from is stored
 211  *   in bio2.bi_private
 212  */
 213 struct bio_pair {
 214         struct bio                      bio1, bio2;
 215         struct bio_vec                  bv1, bv2;
 216 #if defined(CONFIG_BLK_DEV_INTEGRITY)
 217         struct bio_integrity_payload    bip1, bip2;
 218         struct bio_vec                  iv1, iv2;
 219 #endif
 220         atomic_t                        cnt;
 221         int                             error;
 222 };
 223 extern struct bio_pair *bio_split(struct bio *bi, int first_sectors);
 224 extern void bio_pair_release(struct bio_pair *dbio);
 225
 226 extern struct bio_set *bioset_create(unsigned int, unsigned int);
 227 extern void bioset_free(struct bio_set *);
 228 extern mempool_t *biovec_create_pool(struct bio_set *bs, int pool_entries);
 229
 230 extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *);
 231 extern void bio_put(struct bio *);
 232
 233 extern void __bio_clone(struct bio *, struct bio *);
 234 extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs);
 235
 236 extern struct bio_set *fs_bio_set;
 237
 238 static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs)
 239 {
 240         return bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set);
 241 }
 242
 243 static inline struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask)
 244 {
 245         return bio_clone_bioset(bio, gfp_mask, fs_bio_set);
 246 }
 247
 248 static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs)
 249 {
 250         return bio_alloc_bioset(gfp_mask, nr_iovecs, NULL);
 251 }
 252
 253 static inline struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask)
 254 {
 255         return bio_clone_bioset(bio, gfp_mask, NULL);
 256
 257 }
 258
 259 extern void bio_endio(struct bio *, int);
 260 struct request_queue;
 261 extern int bio_phys_segments(struct request_queue *, struct bio *);
 262
 263 extern int submit_bio_wait(int rw, struct bio *bio);
 264 extern void bio_advance(struct bio *, unsigned);
 265
 266 extern void bio_init(struct bio *);
 267 extern void bio_reset(struct bio *);
 268
 269 extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int);
 270 extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *,
 271                            unsigned int, unsigned int);
 272 extern int bio_get_nr_vecs(struct block_device *);
 273 extern sector_t bio_sector_offset(struct bio *, unsigned short, unsigned int);
 274 extern struct bio *bio_map_user(struct request_queue *, struct block_device *,
 275                                 unsigned long, unsigned int, int, gfp_t);
 276 struct sg_iovec;
 277 struct rq_map_data;
 278 extern struct bio *bio_map_user_iov(struct request_queue *,
 279                                     struct block_device *,
 280                                     struct sg_iovec *, int, int, gfp_t);
 281 extern void bio_unmap_user(struct bio *);
 282 extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int,
 283                                 gfp_t);
 284 extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int,
 285                                  gfp_t, int);
 286 extern void bio_set_pages_dirty(struct bio *bio);
 287 extern void bio_check_pages_dirty(struct bio *bio);
 288
 289 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
 290 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
 291 #endif
 292 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
 293 extern void bio_flush_dcache_pages(struct bio *bi);
 294 #else
 295 static inline void bio_flush_dcache_pages(struct bio *bi)
 296 {
 297 }
 298 #endif
 299
 300 extern void bio_copy_data(struct bio *dst, struct bio *src);
 301 extern int bio_alloc_pages(struct bio *bio, gfp_t gfp);
 302
 303 extern struct bio *bio_copy_user(struct request_queue *, struct rq_map_data *,
 304                                  unsigned long, unsigned int, int, gfp_t);
 305 extern struct bio *bio_copy_user_iov(struct request_queue *,
 306                                      struct rq_map_data *, struct sg_iovec *,
 307                                      int, int, gfp_t);
 308 extern int bio_uncopy_user(struct bio *);
 309 void zero_fill_bio(struct bio *bio);
 310 extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *);
 311 extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int);
 312 extern unsigned int bvec_nr_vecs(unsigned short idx);
 313
 314 #ifdef CONFIG_BLK_CGROUP
 315 int bio_associate_current(struct bio *bio);
 316 void bio_disassociate_task(struct bio *bio);
 317 #else   /* CONFIG_BLK_CGROUP */
 318 static inline int bio_associate_current(struct bio *bio) { return -ENOENT; }
 319 static inline void bio_disassociate_task(struct bio *bio) { }
 320 #endif  /* CONFIG_BLK_CGROUP */
 321
 322 #ifdef CONFIG_HIGHMEM
 323 /*
 324  * remember never ever reenable interrupts between a bvec_kmap_irq and
 325  * bvec_kunmap_irq!
 326  */
 327 static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags)
 328 {
 329         unsigned long addr;
 330
 331         /*
 332          * might not be a highmem page, but the preempt/irq count
 333          * balancing is a lot nicer this way
 334          */
 335         local_irq_save(*flags);
 336         addr = (unsigned long) kmap_atomic(bvec->bv_page);
 337
 338         BUG_ON(addr & ~PAGE_MASK);
 339
 340         return (char *) addr + bvec->bv_offset;
 341 }
 342
 343 static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags)
 344 {
 345         unsigned long ptr = (unsigned long) buffer & PAGE_MASK;
 346
 347         kunmap_atomic((void *) ptr);
 348         local_irq_restore(*flags);
 349 }
 350
 351 #else
 352 static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags)
 353 {
 354         return page_address(bvec->bv_page) + bvec->bv_offset;
 355 }
 356
 357 static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags)
 358 {
 359         *flags = 0;
 360 }
 361 #endif
 362
 363 static inline char *__bio_kmap_irq(struct bio *bio, unsigned short idx,
 364                                    unsigned long *flags)
 365 {
 366         return bvec_kmap_irq(bio_iovec_idx(bio, idx), flags);
 367 }
 368 #define __bio_kunmap_irq(buf, flags)    bvec_kunmap_irq(buf, flags)
 369
 370 #define bio_kmap_irq(bio, flags) \
 371         __bio_kmap_irq((bio), (bio)->bi_idx, (flags))
 372 #define bio_kunmap_irq(buf,flags)       __bio_kunmap_irq(buf, flags)
 373
 374 /*
 375  * Check whether this bio carries any data or not. A NULL bio is allowed.
 376  */
 377 static inline bool bio_has_data(struct bio *bio)
 378 {
 379         if (bio && bio->bi_vcnt)
 380                 return true;
 381
 382         return false;
 383 }
 384
 385 static inline bool bio_is_rw(struct bio *bio)
 386 {
 387         if (!bio_has_data(bio))
 388                 return false;
 389
 390         if (bio->bi_rw & REQ_WRITE_SAME)
 391                 return false;
 392
 393         return true;
 394 }
 395
 396 static inline bool bio_mergeable(struct bio *bio)
 397 {
 398         if (bio->bi_rw & REQ_NOMERGE_FLAGS)
 399                 return false;
 400
 401         return true;
 402 }
 403
 404 /*
 405  * BIO list management for use by remapping drivers (e.g. DM or MD) and loop.
 406  *
 407  * A bio_list anchors a singly-linked list of bios chained through the bi_next
 408  * member of the bio.  The bio_list also caches the last list member to allow
 409  * fast access to the tail.
 410  */
 411 struct bio_list {
 412         struct bio *head;
 413         struct bio *tail;
 414 };
 415
 416 static inline int bio_list_empty(const struct bio_list *bl)
 417 {
 418         return bl->head == NULL;
 419 }
 420
 421 static inline void bio_list_init(struct bio_list *bl)
 422 {
 423         bl->head = bl->tail = NULL;
 424 }
 425
 426 #define bio_list_for_each(bio, bl) \
 427         for (bio = (bl)->head; bio; bio = bio->bi_next)
 428
 429 static inline unsigned bio_list_size(const struct bio_list *bl)
 430 {
 431         unsigned sz = 0;
 432         struct bio *bio;
 433
 434         bio_list_for_each(bio, bl)
 435                 sz++;
 436
 437         return sz;
 438 }
 439
 440 static inline void bio_list_add(struct bio_list *bl, struct bio *bio)
 441 {
 442         bio->bi_next = NULL;
 443
 444         if (bl->tail)
 445                 bl->tail->bi_next = bio;
 446         else
 447                 bl->head = bio;
 448
 449         bl->tail = bio;
 450 }
 451
 452 static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio)
 453 {
 454         bio->bi_next = bl->head;
 455
 456         bl->head = bio;
 457
 458         if (!bl->tail)
 459                 bl->tail = bio;
 460 }
 461
 462 static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2)
 463 {
 464         if (!bl2->head)
 465                 return;
 466
 467         if (bl->tail)
 468                 bl->tail->bi_next = bl2->head;
 469         else
 470                 bl->head = bl2->head;
 471
 472         bl->tail = bl2->tail;
 473 }
 474
 475 static inline void bio_list_merge_head(struct bio_list *bl,
 476                                        struct bio_list *bl2)
 477 {
 478         if (!bl2->head)
 479                 return;
 480
 481         if (bl->head)
 482                 bl2->tail->bi_next = bl->head;
 483         else
 484                 bl->tail = bl2->tail;
 485
 486         bl->head = bl2->head;
 487 }
 488
 489 static inline struct bio *bio_list_peek(struct bio_list *bl)
 490 {
 491         return bl->head;
 492 }
 493
 494 static inline struct bio *bio_list_pop(struct bio_list *bl)
 495 {
 496         struct bio *bio = bl->head;
 497
 498         if (bio) {
 499                 bl->head = bl->head->bi_next;
 500                 if (!bl->head)
 501                         bl->tail = NULL;
 502
 503                 bio->bi_next = NULL;
 504         }
 505
 506         return bio;
 507 }
 508
 509 static inline struct bio *bio_list_get(struct bio_list *bl)
 510 {
 511         struct bio *bio = bl->head;
 512
 513         bl->head = bl->tail = NULL;
 514
 515         return bio;
 516 }
 517
 518 /*
 519  * bio_set is used to allow other portions of the IO system to
 520  * allocate their own private memory pools for bio and iovec structures.
 521  * These memory pools in turn all allocate from the bio_slab
 522  * and the bvec_slabs[].
 523  */
 524 #define BIO_POOL_SIZE 2
 525 #define BIOVEC_NR_POOLS 6
 526 #define BIOVEC_MAX_IDX  (BIOVEC_NR_POOLS - 1)
 527
 528 struct bio_set {
 529         struct kmem_cache *bio_slab;
 530         unsigned int front_pad;
 531
 532         mempool_t *bio_pool;
 533         mempool_t *bvec_pool;
 534 #if defined(CONFIG_BLK_DEV_INTEGRITY)
 535         mempool_t *bio_integrity_pool;
 536         mempool_t *bvec_integrity_pool;
 537 #endif
 538
 539         /*
 540          * Deadlock avoidance for stacking block drivers: see comments in
 541          * bio_alloc_bioset() for details
 542          */
 543         spinlock_t              rescue_lock;
 544         struct bio_list         rescue_list;
 545         struct work_struct      rescue_work;
 546         struct workqueue_struct *rescue_workqueue;
 547 };
 548
 549 struct biovec_slab {
 550         int nr_vecs;
 551         char *name;
 552         struct kmem_cache *slab;
 553 };
 554
 555 /*
 556  * a small number of entries is fine, not going to be performance critical.
 557  * basically we just need to survive
 558  */
 559 #define BIO_SPLIT_ENTRIES 2
 560
 561 #if defined(CONFIG_BLK_DEV_INTEGRITY)
 562
 563 #define bip_vec_idx(bip, idx)   (&(bip->bip_vec[(idx)]))
 564 #define bip_vec(bip)            bip_vec_idx(bip, 0)
 565
 566 #define __bip_for_each_vec(bvl, bip, i, start_idx)                      \
 567         for (bvl = bip_vec_idx((bip), (start_idx)), i = (start_idx);    \
 568              i < (bip)->bip_vcnt;                                       \
 569              bvl++, i++)
 570
 571 #define bip_for_each_vec(bvl, bip, i)                                   \
 572         __bip_for_each_vec(bvl, bip, i, (bip)->bip_idx)
 573
 574 #define bio_for_each_integrity_vec(_bvl, _bio, _iter)                   \
 575         for_each_bio(_bio)                                              \
 576                 bip_for_each_vec(_bvl, _bio->bi_integrity, _iter)
 577
 578 #define bio_integrity(bio) (bio->bi_integrity != NULL)
 579
 580 extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int);
 581 extern void bio_integrity_free(struct bio *);
 582 extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int);
 583 extern int bio_integrity_enabled(struct bio *bio);
 584 extern int bio_integrity_set_tag(struct bio *, void *, unsigned int);
 585 extern int bio_integrity_get_tag(struct bio *, void *, unsigned int);
 586 extern int bio_integrity_prep(struct bio *);
 587 extern void bio_integrity_endio(struct bio *, int);
 588 extern void bio_integrity_advance(struct bio *, unsigned int);
 589 extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int);
 590 extern void bio_integrity_split(struct bio *, struct bio_pair *, int);
 591 extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t);
 592 extern int bioset_integrity_create(struct bio_set *, int);
 593 extern void bioset_integrity_free(struct bio_set *);
 594 extern void bio_integrity_init(void);
 595
 596 #else /* CONFIG_BLK_DEV_INTEGRITY */
 597
 598 static inline int bio_integrity(struct bio *bio)
 599 {
 600         return 0;
 601 }
 602
 603 static inline int bio_integrity_enabled(struct bio *bio)
 604 {
 605         return 0;
 606 }
 607
 608 static inline int bioset_integrity_create(struct bio_set *bs, int pool_size)
 609 {
 610         return 0;
 611 }
 612
 613 static inline void bioset_integrity_free (struct bio_set *bs)
 614 {
 615         return;
 616 }
 617
 618 static inline int bio_integrity_prep(struct bio *bio)
 619 {
 620         return 0;
 621 }
 622
 623 static inline void bio_integrity_free(struct bio *bio)
 624 {
 625         return;
 626 }
 627
 628 static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src,
 629                                       gfp_t gfp_mask)
 630 {
 631         return 0;
 632 }
 633
 634 static inline void bio_integrity_split(struct bio *bio, struct bio_pair *bp,
 635                                        int sectors)
 636 {
 637         return;
 638 }
 639
 640 static inline void bio_integrity_advance(struct bio *bio,
 641                                          unsigned int bytes_done)
 642 {
 643         return;
 644 }
 645
 646 static inline void bio_integrity_trim(struct bio *bio, unsigned int offset,
 647                                       unsigned int sectors)
 648 {
 649         return;
 650 }
 651
 652 static inline void bio_integrity_init(void)
 653 {
 654         return;
 655 }
 656
 657 #endif /* CONFIG_BLK_DEV_INTEGRITY */
 658
 659 #endif /* CONFIG_BLOCK */
 660 #endif /* __LINUX_BIO_H */