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