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_iter.bi_idx)
  66
  67 #define bio_iter_iovec(bio, iter) ((bio)->bi_io_vec[(iter).bi_idx])
  68
  69 #define bio_page(bio)           (bio_iovec((bio)).bv_page)
  70 #define bio_offset(bio)         (bio_iovec((bio)).bv_offset)
  71 #define bio_iovec(bio)          (*__bio_iovec(bio))
  72
  73 #define bio_segments(bio)       ((bio)->bi_vcnt - (bio)->bi_iter.bi_idx)
  74 #define bio_sectors(bio)        ((bio)->bi_iter.bi_size >> 9)
  75 #define bio_end_sector(bio)     ((bio)->bi_iter.bi_sector + bio_sectors((bio)))
  76
  77 static inline unsigned int bio_cur_bytes(struct bio *bio)
  78 {
  79         if (bio->bi_vcnt)
  80                 return bio_iovec(bio).bv_len;
  81         else /* dataless requests such as discard */
  82                 return bio->bi_iter.bi_size;
  83 }
  84
  85 static inline void *bio_data(struct bio *bio)
  86 {
  87         if (bio->bi_vcnt)
  88                 return page_address(bio_page(bio)) + bio_offset(bio);
  89
  90         return NULL;
  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)                             \
 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) 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_iter.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 _never_ use the all version - the bio may have been split
 141  * before it got to the driver and the driver won't own all of it
 142  */
 143 #define bio_for_each_segment_all(bvl, bio, i)                           \
 144         for (i = 0;                                                     \
 145              bvl = bio_iovec_idx((bio), (i)), i < (bio)->bi_vcnt;       \
 146              i++)
 147
 148 #define __bio_for_each_segment(bvl, bio, iter, start)                   \
 149         for (iter = (start);                                            \
 150              bvl = bio_iter_iovec((bio), (iter)),                       \
 151              (iter).bi_idx < (bio)->bi_vcnt;                            \
 152              (iter).bi_idx++)
 153
 154 #define bio_for_each_segment(bvl, bio, iter)                            \
 155         __bio_for_each_segment(bvl, bio, iter, (bio)->bi_iter)
 156
 157 #define bio_iter_last(bio, iter) ((iter).bi_idx == (bio)->bi_vcnt - 1)
 158
 159 /*
 160  * get a reference to a bio, so it won't disappear. the intended use is
 161  * something like:
 162  *
 163  * bio_get(bio);
 164  * submit_bio(rw, bio);
 165  * if (bio->bi_flags ...)
 166  *      do_something
 167  * bio_put(bio);
 168  *
 169  * without the bio_get(), it could potentially complete I/O before submit_bio
 170  * returns. and then bio would be freed memory when if (bio->bi_flags ...)
 171  * runs
 172  */
 173 #define bio_get(bio)    atomic_inc(&(bio)->bi_cnt)
 174
 175 #if defined(CONFIG_BLK_DEV_INTEGRITY)
 176 /*
 177  * bio integrity payload
 178  */
 179 struct bio_integrity_payload {
 180         struct bio              *bip_bio;       /* parent bio */
 181
 182         sector_t                bip_sector;     /* virtual start sector */
 183
 184         void                    *bip_buf;       /* generated integrity data */
 185         bio_end_io_t            *bip_end_io;    /* saved I/O completion fn */
 186
 187         unsigned int            bip_size;
 188
 189         unsigned short          bip_slab;       /* slab the bip came from */
 190         unsigned short          bip_vcnt;       /* # of integrity bio_vecs */
 191         unsigned short          bip_idx;        /* current bip_vec index */
 192         unsigned                bip_owns_buf:1; /* should free bip_buf */
 193
 194         struct work_struct      bip_work;       /* I/O completion */
 195
 196         struct bio_vec          *bip_vec;
 197         struct bio_vec          bip_inline_vecs[0];/* embedded bvec array */
 198 };
 199 #endif /* CONFIG_BLK_DEV_INTEGRITY */
 200
 201 /*
 202  * A bio_pair is used when we need to split a bio.
 203  * This can only happen for a bio that refers to just one
 204  * page of data, and in the unusual situation when the
 205  * page crosses a chunk/device boundary
 206  *
 207  * The address of the master bio is stored in bio1.bi_private
 208  * The address of the pool the pair was allocated from is stored
 209  *   in bio2.bi_private
 210  */
 211 struct bio_pair {
 212         struct bio                      bio1, bio2;
 213         struct bio_vec                  bv1, bv2;
 214 #if defined(CONFIG_BLK_DEV_INTEGRITY)
 215         struct bio_integrity_payload    bip1, bip2;
 216         struct bio_vec                  iv1, iv2;
 217 #endif
 218         atomic_t                        cnt;
 219         int                             error;
 220 };
 221 extern struct bio_pair *bio_split(struct bio *bi, int first_sectors);
 222 extern void bio_pair_release(struct bio_pair *dbio);
 223 extern void bio_trim(struct bio *bio, int offset, int size);
 224
 225 extern struct bio_set *bioset_create(unsigned int, unsigned int);
 226 extern void bioset_free(struct bio_set *);
 227 extern mempool_t *biovec_create_pool(struct bio_set *bs, int pool_entries);
 228
 229 extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *);
 230 extern void bio_put(struct bio *);
 231
 232 extern void __bio_clone(struct bio *, struct bio *);
 233 extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs);
 234
 235 extern struct bio_set *fs_bio_set;
 236
 237 static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs)
 238 {
 239         return bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set);
 240 }
 241
 242 static inline struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask)
 243 {
 244         return bio_clone_bioset(bio, gfp_mask, fs_bio_set);
 245 }
 246
 247 static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs)
 248 {
 249         return bio_alloc_bioset(gfp_mask, nr_iovecs, NULL);
 250 }
 251
 252 static inline struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask)
 253 {
 254         return bio_clone_bioset(bio, gfp_mask, NULL);
 255
 256 }
 257
 258 extern void bio_endio(struct bio *, int);
 259 struct request_queue;
 260 extern int bio_phys_segments(struct request_queue *, struct bio *);
 261
 262 extern int submit_bio_wait(int rw, struct bio *bio);
 263 extern void bio_advance(struct bio *, unsigned);
 264
 265 extern void bio_init(struct bio *);
 266 extern void bio_reset(struct bio *);
 267
 268 extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int);
 269 extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *,
 270                            unsigned int, unsigned int);
 271 extern int bio_get_nr_vecs(struct block_device *);
 272 extern sector_t bio_sector_offset(struct bio *, unsigned short, unsigned int);
 273 extern struct bio *bio_map_user(struct request_queue *, struct block_device *,
 274                                 unsigned long, unsigned int, int, gfp_t);
 275 struct sg_iovec;
 276 struct rq_map_data;
 277 extern struct bio *bio_map_user_iov(struct request_queue *,
 278                                     struct block_device *,
 279                                     struct sg_iovec *, int, int, gfp_t);
 280 extern void bio_unmap_user(struct bio *);
 281 extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int,
 282                                 gfp_t);
 283 extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int,
 284                                  gfp_t, int);
 285 extern void bio_set_pages_dirty(struct bio *bio);
 286 extern void bio_check_pages_dirty(struct bio *bio);
 287
 288 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
 289 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
 290 #endif
 291 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
 292 extern void bio_flush_dcache_pages(struct bio *bi);
 293 #else
 294 static inline void bio_flush_dcache_pages(struct bio *bi)
 295 {
 296 }
 297 #endif
 298
 299 extern void bio_copy_data(struct bio *dst, struct bio *src);
 300 extern int bio_alloc_pages(struct bio *bio, gfp_t gfp);
 301
 302 extern struct bio *bio_copy_user(struct request_queue *, struct rq_map_data *,
 303                                  unsigned long, unsigned int, int, gfp_t);
 304 extern struct bio *bio_copy_user_iov(struct request_queue *,
 305                                      struct rq_map_data *, struct sg_iovec *,
 306                                      int, int, gfp_t);
 307 extern int bio_uncopy_user(struct bio *);
 308 void zero_fill_bio(struct bio *bio);
 309 extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *);
 310 extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int);
 311 extern unsigned int bvec_nr_vecs(unsigned short idx);
 312
 313 #ifdef CONFIG_BLK_CGROUP
 314 int bio_associate_current(struct bio *bio);
 315 void bio_disassociate_task(struct bio *bio);
 316 #else   /* CONFIG_BLK_CGROUP */
 317 static inline int bio_associate_current(struct bio *bio) { return -ENOENT; }
 318 static inline void bio_disassociate_task(struct bio *bio) { }
 319 #endif  /* CONFIG_BLK_CGROUP */
 320
 321 #ifdef CONFIG_HIGHMEM
 322 /*
 323  * remember never ever reenable interrupts between a bvec_kmap_irq and
 324  * bvec_kunmap_irq!
 325  */
 326 static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags)
 327 {
 328         unsigned long addr;
 329
 330         /*
 331          * might not be a highmem page, but the preempt/irq count
 332          * balancing is a lot nicer this way
 333          */
 334         local_irq_save(*flags);
 335         addr = (unsigned long) kmap_atomic(bvec->bv_page);
 336
 337         BUG_ON(addr & ~PAGE_MASK);
 338
 339         return (char *) addr + bvec->bv_offset;
 340 }
 341
 342 static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags)
 343 {
 344         unsigned long ptr = (unsigned long) buffer & PAGE_MASK;
 345
 346         kunmap_atomic((void *) ptr);
 347         local_irq_restore(*flags);
 348 }
 349
 350 #else
 351 static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags)
 352 {
 353         return page_address(bvec->bv_page) + bvec->bv_offset;
 354 }
 355
 356 static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags)
 357 {
 358         *flags = 0;
 359 }
 360 #endif
 361
 362 static inline char *__bio_kmap_irq(struct bio *bio, unsigned short idx,
 363                                    unsigned long *flags)
 364 {
 365         return bvec_kmap_irq(bio_iovec_idx(bio, idx), flags);
 366 }
 367 #define __bio_kunmap_irq(buf, flags)    bvec_kunmap_irq(buf, flags)
 368
 369 #define bio_kmap_irq(bio, flags) \
 370         __bio_kmap_irq((bio), (bio)->bi_iter.bi_idx, (flags))
 371 #define bio_kunmap_irq(buf,flags)       __bio_kunmap_irq(buf, flags)
 372
 373 /*
 374  * Check whether this bio carries any data or not. A NULL bio is allowed.
 375  */
 376 static inline bool bio_has_data(struct bio *bio)
 377 {
 378         if (bio && bio->bi_vcnt)
 379                 return true;
 380
 381         return false;
 382 }
 383
 384 static inline bool bio_is_rw(struct bio *bio)
 385 {
 386         if (!bio_has_data(bio))
 387                 return false;
 388
 389         if (bio->bi_rw & REQ_WRITE_SAME)
 390                 return false;
 391
 392         return true;
 393 }
 394
 395 static inline bool bio_mergeable(struct bio *bio)
 396 {
 397         if (bio->bi_rw & REQ_NOMERGE_FLAGS)
 398                 return false;
 399
 400         return true;
 401 }
 402
 403 /*
 404  * BIO list management for use by remapping drivers (e.g. DM or MD) and loop.
 405  *
 406  * A bio_list anchors a singly-linked list of bios chained through the bi_next
 407  * member of the bio.  The bio_list also caches the last list member to allow
 408  * fast access to the tail.
 409  */
 410 struct bio_list {
 411         struct bio *head;
 412         struct bio *tail;
 413 };
 414
 415 static inline int bio_list_empty(const struct bio_list *bl)
 416 {
 417         return bl->head == NULL;
 418 }
 419
 420 static inline void bio_list_init(struct bio_list *bl)
 421 {
 422         bl->head = bl->tail = NULL;
 423 }
 424
 425 #define BIO_EMPTY_LIST  { NULL, NULL }
 426
 427 #define bio_list_for_each(bio, bl) \
 428         for (bio = (bl)->head; bio; bio = bio->bi_next)
 429
 430 static inline unsigned bio_list_size(const struct bio_list *bl)
 431 {
 432         unsigned sz = 0;
 433         struct bio *bio;
 434
 435         bio_list_for_each(bio, bl)
 436                 sz++;
 437
 438         return sz;
 439 }
 440
 441 static inline void bio_list_add(struct bio_list *bl, struct bio *bio)
 442 {
 443         bio->bi_next = NULL;
 444
 445         if (bl->tail)
 446                 bl->tail->bi_next = bio;
 447         else
 448                 bl->head = bio;
 449
 450         bl->tail = bio;
 451 }
 452
 453 static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio)
 454 {
 455         bio->bi_next = bl->head;
 456
 457         bl->head = bio;
 458
 459         if (!bl->tail)
 460                 bl->tail = bio;
 461 }
 462
 463 static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2)
 464 {
 465         if (!bl2->head)
 466                 return;
 467
 468         if (bl->tail)
 469                 bl->tail->bi_next = bl2->head;
 470         else
 471                 bl->head = bl2->head;
 472
 473         bl->tail = bl2->tail;
 474 }
 475
 476 static inline void bio_list_merge_head(struct bio_list *bl,
 477                                        struct bio_list *bl2)
 478 {
 479         if (!bl2->head)
 480                 return;
 481
 482         if (bl->head)
 483                 bl2->tail->bi_next = bl->head;
 484         else
 485                 bl->tail = bl2->tail;
 486
 487         bl->head = bl2->head;
 488 }
 489
 490 static inline struct bio *bio_list_peek(struct bio_list *bl)
 491 {
 492         return bl->head;
 493 }
 494
 495 static inline struct bio *bio_list_pop(struct bio_list *bl)
 496 {
 497         struct bio *bio = bl->head;
 498
 499         if (bio) {
 500                 bl->head = bl->head->bi_next;
 501                 if (!bl->head)
 502                         bl->tail = NULL;
 503
 504                 bio->bi_next = NULL;
 505         }
 506
 507         return bio;
 508 }
 509
 510 static inline struct bio *bio_list_get(struct bio_list *bl)
 511 {
 512         struct bio *bio = bl->head;
 513
 514         bl->head = bl->tail = NULL;
 515
 516         return bio;
 517 }
 518
 519 /*
 520  * bio_set is used to allow other portions of the IO system to
 521  * allocate their own private memory pools for bio and iovec structures.
 522  * These memory pools in turn all allocate from the bio_slab
 523  * and the bvec_slabs[].
 524  */
 525 #define BIO_POOL_SIZE 2
 526 #define BIOVEC_NR_POOLS 6
 527 #define BIOVEC_MAX_IDX  (BIOVEC_NR_POOLS - 1)
 528
 529 struct bio_set {
 530         struct kmem_cache *bio_slab;
 531         unsigned int front_pad;
 532
 533         mempool_t *bio_pool;
 534         mempool_t *bvec_pool;
 535 #if defined(CONFIG_BLK_DEV_INTEGRITY)
 536         mempool_t *bio_integrity_pool;
 537         mempool_t *bvec_integrity_pool;
 538 #endif
 539
 540         /*
 541          * Deadlock avoidance for stacking block drivers: see comments in
 542          * bio_alloc_bioset() for details
 543          */
 544         spinlock_t              rescue_lock;
 545         struct bio_list         rescue_list;
 546         struct work_struct      rescue_work;
 547         struct workqueue_struct *rescue_workqueue;
 548 };
 549
 550 struct biovec_slab {
 551         int nr_vecs;
 552         char *name;
 553         struct kmem_cache *slab;
 554 };
 555
 556 /*
 557  * a small number of entries is fine, not going to be performance critical.
 558  * basically we just need to survive
 559  */
 560 #define BIO_SPLIT_ENTRIES 2
 561
 562 #if defined(CONFIG_BLK_DEV_INTEGRITY)
 563
 564 #define bip_vec_idx(bip, idx)   (&(bip->bip_vec[(idx)]))
 565 #define bip_vec(bip)            bip_vec_idx(bip, 0)
 566
 567 #define __bip_for_each_vec(bvl, bip, i, start_idx)                      \
 568         for (bvl = bip_vec_idx((bip), (start_idx)), i = (start_idx);    \
 569              i < (bip)->bip_vcnt;                                       \
 570              bvl++, i++)
 571
 572 #define bip_for_each_vec(bvl, bip, i)                                   \
 573         __bip_for_each_vec(bvl, bip, i, (bip)->bip_idx)
 574
 575 #define bio_for_each_integrity_vec(_bvl, _bio, _iter)                   \
 576         for_each_bio(_bio)                                              \
 577                 bip_for_each_vec(_bvl, _bio->bi_integrity, _iter)
 578
 579 #define bio_integrity(bio) (bio->bi_integrity != NULL)
 580
 581 extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int);
 582 extern void bio_integrity_free(struct bio *);
 583 extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int);
 584 extern int bio_integrity_enabled(struct bio *bio);
 585 extern int bio_integrity_set_tag(struct bio *, void *, unsigned int);
 586 extern int bio_integrity_get_tag(struct bio *, void *, unsigned int);
 587 extern int bio_integrity_prep(struct bio *);
 588 extern void bio_integrity_endio(struct bio *, int);
 589 extern void bio_integrity_advance(struct bio *, unsigned int);
 590 extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int);
 591 extern void bio_integrity_split(struct bio *, struct bio_pair *, int);
 592 extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t);
 593 extern int bioset_integrity_create(struct bio_set *, int);
 594 extern void bioset_integrity_free(struct bio_set *);
 595 extern void bio_integrity_init(void);
 596
 597 #else /* CONFIG_BLK_DEV_INTEGRITY */
 598
 599 static inline int bio_integrity(struct bio *bio)
 600 {
 601         return 0;
 602 }
 603
 604 static inline int bio_integrity_enabled(struct bio *bio)
 605 {
 606         return 0;
 607 }
 608
 609 static inline int bioset_integrity_create(struct bio_set *bs, int pool_size)
 610 {
 611         return 0;
 612 }
 613
 614 static inline void bioset_integrity_free (struct bio_set *bs)
 615 {
 616         return;
 617 }
 618
 619 static inline int bio_integrity_prep(struct bio *bio)
 620 {
 621         return 0;
 622 }
 623
 624 static inline void bio_integrity_free(struct bio *bio)
 625 {
 626         return;
 627 }
 628
 629 static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src,
 630                                       gfp_t gfp_mask)
 631 {
 632         return 0;
 633 }
 634
 635 static inline void bio_integrity_split(struct bio *bio, struct bio_pair *bp,
 636                                        int sectors)
 637 {
 638         return;
 639 }
 640
 641 static inline void bio_integrity_advance(struct bio *bio,
 642                                          unsigned int bytes_done)
 643 {
 644         return;
 645 }
 646
 647 static inline void bio_integrity_trim(struct bio *bio, unsigned int offset,
 648                                       unsigned int sectors)
 649 {
 650         return;
 651 }
 652
 653 static inline void bio_integrity_init(void)
 654 {
 655         return;
 656 }
 657
 658 #endif /* CONFIG_BLK_DEV_INTEGRITY */
 659
 660 #endif /* CONFIG_BLOCK */
 661 #endif /* __LINUX_BIO_H */