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