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 extern void bio_trim(struct bio *bio, int offset, int size);
 222
 223 extern struct bio_set *bioset_create(unsigned int, unsigned int);
 224 extern void bioset_free(struct bio_set *);
 225 extern mempool_t *biovec_create_pool(struct bio_set *bs, int pool_entries);
 226
 227 extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *);
 228 extern void bio_put(struct bio *);
 229
 230 extern void __bio_clone(struct bio *, struct bio *);
 231 extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs);
 232
 233 extern struct bio_set *fs_bio_set;
 234
 235 static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs)
 236 {
 237         return bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set);
 238 }
 239
 240 static inline struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask)
 241 {
 242         return bio_clone_bioset(bio, gfp_mask, fs_bio_set);
 243 }
 244
 245 static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs)
 246 {
 247         return bio_alloc_bioset(gfp_mask, nr_iovecs, NULL);
 248 }
 249
 250 static inline struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask)
 251 {
 252         return bio_clone_bioset(bio, gfp_mask, NULL);
 253
 254 }
 255
 256 extern void bio_endio(struct bio *, int);
 257 struct request_queue;
 258 extern int bio_phys_segments(struct request_queue *, struct bio *);
 259
 260 extern int submit_bio_wait(int rw, struct bio *bio);
 261 extern void bio_advance(struct bio *, unsigned);
 262
 263 extern void bio_init(struct bio *);
 264 extern void bio_reset(struct bio *);
 265
 266 extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int);
 267 extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *,
 268                            unsigned int, unsigned int);
 269 extern int bio_get_nr_vecs(struct block_device *);
 270 extern sector_t bio_sector_offset(struct bio *, unsigned short, unsigned int);
 271 extern struct bio *bio_map_user(struct request_queue *, struct block_device *,
 272                                 unsigned long, unsigned int, int, gfp_t);
 273 struct sg_iovec;
 274 struct rq_map_data;
 275 extern struct bio *bio_map_user_iov(struct request_queue *,
 276                                     struct block_device *,
 277                                     struct sg_iovec *, int, int, gfp_t);
 278 extern void bio_unmap_user(struct bio *);
 279 extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int,
 280                                 gfp_t);
 281 extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int,
 282                                  gfp_t, int);
 283 extern void bio_set_pages_dirty(struct bio *bio);
 284 extern void bio_check_pages_dirty(struct bio *bio);
 285
 286 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
 287 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
 288 #endif
 289 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
 290 extern void bio_flush_dcache_pages(struct bio *bi);
 291 #else
 292 static inline void bio_flush_dcache_pages(struct bio *bi)
 293 {
 294 }
 295 #endif
 296
 297 extern void bio_copy_data(struct bio *dst, struct bio *src);
 298 extern int bio_alloc_pages(struct bio *bio, gfp_t gfp);
 299
 300 extern struct bio *bio_copy_user(struct request_queue *, struct rq_map_data *,
 301                                  unsigned long, unsigned int, int, gfp_t);
 302 extern struct bio *bio_copy_user_iov(struct request_queue *,
 303                                      struct rq_map_data *, struct sg_iovec *,
 304                                      int, int, gfp_t);
 305 extern int bio_uncopy_user(struct bio *);
 306 void zero_fill_bio(struct bio *bio);
 307 extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *);
 308 extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int);
 309 extern unsigned int bvec_nr_vecs(unsigned short idx);
 310
 311 #ifdef CONFIG_BLK_CGROUP
 312 int bio_associate_current(struct bio *bio);
 313 void bio_disassociate_task(struct bio *bio);
 314 #else   /* CONFIG_BLK_CGROUP */
 315 static inline int bio_associate_current(struct bio *bio) { return -ENOENT; }
 316 static inline void bio_disassociate_task(struct bio *bio) { }
 317 #endif  /* CONFIG_BLK_CGROUP */
 318
 319 #ifdef CONFIG_HIGHMEM
 320 /*
 321  * remember never ever reenable interrupts between a bvec_kmap_irq and
 322  * bvec_kunmap_irq!
 323  */
 324 static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags)
 325 {
 326         unsigned long addr;
 327
 328         /*
 329          * might not be a highmem page, but the preempt/irq count
 330          * balancing is a lot nicer this way
 331          */
 332         local_irq_save(*flags);
 333         addr = (unsigned long) kmap_atomic(bvec->bv_page);
 334
 335         BUG_ON(addr & ~PAGE_MASK);
 336
 337         return (char *) addr + bvec->bv_offset;
 338 }
 339
 340 static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags)
 341 {
 342         unsigned long ptr = (unsigned long) buffer & PAGE_MASK;
 343
 344         kunmap_atomic((void *) ptr);
 345         local_irq_restore(*flags);
 346 }
 347
 348 #else
 349 static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags)
 350 {
 351         return page_address(bvec->bv_page) + bvec->bv_offset;
 352 }
 353
 354 static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags)
 355 {
 356         *flags = 0;
 357 }
 358 #endif
 359
 360 static inline char *__bio_kmap_irq(struct bio *bio, unsigned short idx,
 361                                    unsigned long *flags)
 362 {
 363         return bvec_kmap_irq(bio_iovec_idx(bio, idx), flags);
 364 }
 365 #define __bio_kunmap_irq(buf, flags)    bvec_kunmap_irq(buf, flags)
 366
 367 #define bio_kmap_irq(bio, flags) \
 368         __bio_kmap_irq((bio), (bio)->bi_idx, (flags))
 369 #define bio_kunmap_irq(buf,flags)       __bio_kunmap_irq(buf, flags)
 370
 371 /*
 372  * Check whether this bio carries any data or not. A NULL bio is allowed.
 373  */
 374 static inline bool bio_has_data(struct bio *bio)
 375 {
 376         if (bio && bio->bi_vcnt)
 377                 return true;
 378
 379         return false;
 380 }
 381
 382 static inline bool bio_is_rw(struct bio *bio)
 383 {
 384         if (!bio_has_data(bio))
 385                 return false;
 386
 387         if (bio->bi_rw & REQ_WRITE_SAME)
 388                 return false;
 389
 390         return true;
 391 }
 392
 393 static inline bool bio_mergeable(struct bio *bio)
 394 {
 395         if (bio->bi_rw & REQ_NOMERGE_FLAGS)
 396                 return false;
 397
 398         return true;
 399 }
 400
 401 /*
 402  * BIO list management for use by remapping drivers (e.g. DM or MD) and loop.
 403  *
 404  * A bio_list anchors a singly-linked list of bios chained through the bi_next
 405  * member of the bio.  The bio_list also caches the last list member to allow
 406  * fast access to the tail.
 407  */
 408 struct bio_list {
 409         struct bio *head;
 410         struct bio *tail;
 411 };
 412
 413 static inline int bio_list_empty(const struct bio_list *bl)
 414 {
 415         return bl->head == NULL;
 416 }
 417
 418 static inline void bio_list_init(struct bio_list *bl)
 419 {
 420         bl->head = bl->tail = NULL;
 421 }
 422
 423 #define BIO_EMPTY_LIST  { NULL, NULL }
 424
 425 #define bio_list_for_each(bio, bl) \
 426         for (bio = (bl)->head; bio; bio = bio->bi_next)
 427
 428 static inline unsigned bio_list_size(const struct bio_list *bl)
 429 {
 430         unsigned sz = 0;
 431         struct bio *bio;
 432
 433         bio_list_for_each(bio, bl)
 434                 sz++;
 435
 436         return sz;
 437 }
 438
 439 static inline void bio_list_add(struct bio_list *bl, struct bio *bio)
 440 {
 441         bio->bi_next = NULL;
 442
 443         if (bl->tail)
 444                 bl->tail->bi_next = bio;
 445         else
 446                 bl->head = bio;
 447
 448         bl->tail = bio;
 449 }
 450
 451 static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio)
 452 {
 453         bio->bi_next = bl->head;
 454
 455         bl->head = bio;
 456
 457         if (!bl->tail)
 458                 bl->tail = bio;
 459 }
 460
 461 static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2)
 462 {
 463         if (!bl2->head)
 464                 return;
 465
 466         if (bl->tail)
 467                 bl->tail->bi_next = bl2->head;
 468         else
 469                 bl->head = bl2->head;
 470
 471         bl->tail = bl2->tail;
 472 }
 473
 474 static inline void bio_list_merge_head(struct bio_list *bl,
 475                                        struct bio_list *bl2)
 476 {
 477         if (!bl2->head)
 478                 return;
 479
 480         if (bl->head)
 481                 bl2->tail->bi_next = bl->head;
 482         else
 483                 bl->tail = bl2->tail;
 484
 485         bl->head = bl2->head;
 486 }
 487
 488 static inline struct bio *bio_list_peek(struct bio_list *bl)
 489 {
 490         return bl->head;
 491 }
 492
 493 static inline struct bio *bio_list_pop(struct bio_list *bl)
 494 {
 495         struct bio *bio = bl->head;
 496
 497         if (bio) {
 498                 bl->head = bl->head->bi_next;
 499                 if (!bl->head)
 500                         bl->tail = NULL;
 501
 502                 bio->bi_next = NULL;
 503         }
 504
 505         return bio;
 506 }
 507
 508 static inline struct bio *bio_list_get(struct bio_list *bl)
 509 {
 510         struct bio *bio = bl->head;
 511
 512         bl->head = bl->tail = NULL;
 513
 514         return bio;
 515 }
 516
 517 /*
 518  * bio_set is used to allow other portions of the IO system to
 519  * allocate their own private memory pools for bio and iovec structures.
 520  * These memory pools in turn all allocate from the bio_slab
 521  * and the bvec_slabs[].
 522  */
 523 #define BIO_POOL_SIZE 2
 524 #define BIOVEC_NR_POOLS 6
 525 #define BIOVEC_MAX_IDX  (BIOVEC_NR_POOLS - 1)
 526
 527 struct bio_set {
 528         struct kmem_cache *bio_slab;
 529         unsigned int front_pad;
 530
 531         mempool_t *bio_pool;
 532         mempool_t *bvec_pool;
 533 #if defined(CONFIG_BLK_DEV_INTEGRITY)
 534         mempool_t *bio_integrity_pool;
 535         mempool_t *bvec_integrity_pool;
 536 #endif
 537
 538         /*
 539          * Deadlock avoidance for stacking block drivers: see comments in
 540          * bio_alloc_bioset() for details
 541          */
 542         spinlock_t              rescue_lock;
 543         struct bio_list         rescue_list;
 544         struct work_struct      rescue_work;
 545         struct workqueue_struct *rescue_workqueue;
 546 };
 547
 548 struct biovec_slab {
 549         int nr_vecs;
 550         char *name;
 551         struct kmem_cache *slab;
 552 };
 553
 554 /*
 555  * a small number of entries is fine, not going to be performance critical.
 556  * basically we just need to survive
 557  */
 558 #define BIO_SPLIT_ENTRIES 2
 559
 560 #if defined(CONFIG_BLK_DEV_INTEGRITY)
 561
 562 #define bip_vec_idx(bip, idx)   (&(bip->bip_vec[(idx)]))
 563 #define bip_vec(bip)            bip_vec_idx(bip, 0)
 564
 565 #define __bip_for_each_vec(bvl, bip, i, start_idx)                      \
 566         for (bvl = bip_vec_idx((bip), (start_idx)), i = (start_idx);    \
 567              i < (bip)->bip_vcnt;                                       \
 568              bvl++, i++)
 569
 570 #define bip_for_each_vec(bvl, bip, i)                                   \
 571         __bip_for_each_vec(bvl, bip, i, (bip)->bip_idx)
 572
 573 #define bio_for_each_integrity_vec(_bvl, _bio, _iter)                   \
 574         for_each_bio(_bio)                                              \
 575                 bip_for_each_vec(_bvl, _bio->bi_integrity, _iter)
 576
 577 #define bio_integrity(bio) (bio->bi_integrity != NULL)
 578
 579 extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int);
 580 extern void bio_integrity_free(struct bio *);
 581 extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int);
 582 extern int bio_integrity_enabled(struct bio *bio);
 583 extern int bio_integrity_set_tag(struct bio *, void *, unsigned int);
 584 extern int bio_integrity_get_tag(struct bio *, void *, unsigned int);
 585 extern int bio_integrity_prep(struct bio *);
 586 extern void bio_integrity_endio(struct bio *, int);
 587 extern void bio_integrity_advance(struct bio *, unsigned int);
 588 extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int);
 589 extern void bio_integrity_split(struct bio *, struct bio_pair *, int);
 590 extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t);
 591 extern int bioset_integrity_create(struct bio_set *, int);
 592 extern void bioset_integrity_free(struct bio_set *);
 593 extern void bio_integrity_init(void);
 594
 595 #else /* CONFIG_BLK_DEV_INTEGRITY */
 596
 597 static inline int bio_integrity(struct bio *bio)
 598 {
 599         return 0;
 600 }
 601
 602 static inline int bio_integrity_enabled(struct bio *bio)
 603 {
 604         return 0;
 605 }
 606
 607 static inline int bioset_integrity_create(struct bio_set *bs, int pool_size)
 608 {
 609         return 0;
 610 }
 611
 612 static inline void bioset_integrity_free (struct bio_set *bs)
 613 {
 614         return;
 615 }
 616
 617 static inline int bio_integrity_prep(struct bio *bio)
 618 {
 619         return 0;
 620 }
 621
 622 static inline void bio_integrity_free(struct bio *bio)
 623 {
 624         return;
 625 }
 626
 627 static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src,
 628                                       gfp_t gfp_mask)
 629 {
 630         return 0;
 631 }
 632
 633 static inline void bio_integrity_split(struct bio *bio, struct bio_pair *bp,
 634                                        int sectors)
 635 {
 636         return;
 637 }
 638
 639 static inline void bio_integrity_advance(struct bio *bio,
 640                                          unsigned int bytes_done)
 641 {
 642         return;
 643 }
 644
 645 static inline void bio_integrity_trim(struct bio *bio, unsigned int offset,
 646                                       unsigned int sectors)
 647 {
 648         return;
 649 }
 650
 651 static inline void bio_integrity_init(void)
 652 {
 653         return;
 654 }
 655
 656 #endif /* CONFIG_BLK_DEV_INTEGRITY */
 657
 658 #endif /* CONFIG_BLOCK */
 659 #endif /* __LINUX_BIO_H */