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
  27 #ifdef CONFIG_BLOCK
  28
  29 #include <asm/io.h>
  30
  31 #define BIO_DEBUG
  32
  33 #ifdef BIO_DEBUG
  34 #define BIO_BUG_ON      BUG_ON
  35 #else
  36 #define BIO_BUG_ON
  37 #endif
  38
  39 #define BIO_MAX_PAGES           256
  40 #define BIO_MAX_SIZE            (BIO_MAX_PAGES << PAGE_CACHE_SHIFT)
  41 #define BIO_MAX_SECTORS         (BIO_MAX_SIZE >> 9)
  42
  43 /*
  44  * was unsigned short, but we might as well be ready for > 64kB I/O pages
  45  */
  46 struct bio_vec {
  47         struct page     *bv_page;
  48         unsigned int    bv_len;
  49         unsigned int    bv_offset;
  50 };
  51
  52 struct bio_set;
  53 struct bio;
  54 struct bio_integrity_payload;
  55 typedef void (bio_end_io_t) (struct bio *, int);
  56 typedef void (bio_destructor_t) (struct bio *);
  57
  58 /*
  59  * main unit of I/O for the block layer and lower layers (ie drivers and
  60  * stacking drivers)
  61  */
  62 struct bio {
  63         sector_t                bi_sector;      /* device address in 512 byte
  64                                                    sectors */
  65         struct bio              *bi_next;       /* request queue link */
  66         struct block_device     *bi_bdev;
  67         unsigned long           bi_flags;       /* status, command, etc */
  68         unsigned long           bi_rw;          /* bottom bits READ/WRITE,
  69                                                  * top bits priority
  70                                                  */
  71
  72         unsigned short          bi_vcnt;        /* how many bio_vec's */
  73         unsigned short          bi_idx;         /* current index into bvl_vec */
  74
  75         /* Number of segments in this BIO after
  76          * physical address coalescing is performed.
  77          */
  78         unsigned int            bi_phys_segments;
  79
  80         unsigned int            bi_size;        /* residual I/O count */
  81
  82         /*
  83          * To keep track of the max segment size, we account for the
  84          * sizes of the first and last mergeable segments in this bio.
  85          */
  86         unsigned int            bi_seg_front_size;
  87         unsigned int            bi_seg_back_size;
  88
  89         unsigned int            bi_max_vecs;    /* max bvl_vecs we can hold */
  90
  91         unsigned int            bi_comp_cpu;    /* completion CPU */
  92
  93         atomic_t                bi_cnt;         /* pin count */
  94
  95         struct bio_vec          *bi_io_vec;     /* the actual vec list */
  96
  97         bio_end_io_t            *bi_end_io;
  98
  99         void                    *bi_private;
 100 #if defined(CONFIG_BLK_DEV_INTEGRITY)
 101         struct bio_integrity_payload *bi_integrity;  /* data integrity */
 102 #endif
 103
 104         bio_destructor_t        *bi_destructor; /* destructor */
 105
 106         /*
 107          * We can inline a number of vecs at the end of the bio, to avoid
 108          * double allocations for a small number of bio_vecs. This member
 109          * MUST obviously be kept at the very end of the bio.
 110          */
 111         struct bio_vec          bi_inline_vecs[0];
 112 };
 113
 114 /*
 115  * bio flags
 116  */
 117 #define BIO_UPTODATE    0       /* ok after I/O completion */
 118 #define BIO_RW_BLOCK    1       /* RW_AHEAD set, and read/write would block */
 119 #define BIO_EOF         2       /* out-out-bounds error */
 120 #define BIO_SEG_VALID   3       /* bi_phys_segments valid */
 121 #define BIO_CLONED      4       /* doesn't own data */
 122 #define BIO_BOUNCED     5       /* bio is a bounce bio */
 123 #define BIO_USER_MAPPED 6       /* contains user pages */
 124 #define BIO_EOPNOTSUPP  7       /* not supported */
 125 #define BIO_CPU_AFFINE  8       /* complete bio on same CPU as submitted */
 126 #define BIO_NULL_MAPPED 9       /* contains invalid user pages */
 127 #define BIO_FS_INTEGRITY 10     /* fs owns integrity data, not block layer */
 128 #define BIO_QUIET       11      /* Make BIO Quiet */
 129 #define bio_flagged(bio, flag)  ((bio)->bi_flags & (1 << (flag)))
 130
 131 /*
 132  * top 4 bits of bio flags indicate the pool this bio came from
 133  */
 134 #define BIO_POOL_BITS           (4)
 135 #define BIO_POOL_OFFSET         (BITS_PER_LONG - BIO_POOL_BITS)
 136 #define BIO_POOL_MASK           (1UL << BIO_POOL_OFFSET)
 137 #define BIO_POOL_IDX(bio)       ((bio)->bi_flags >> BIO_POOL_OFFSET)
 138
 139 /*
 140  * bio bi_rw flags
 141  *
 142  * bit 0 -- data direction
 143  *      If not set, bio is a read from device. If set, it's a write to device.
 144  * bit 1 -- rw-ahead when set
 145  * bit 2 -- barrier
 146  *      Insert a serialization point in the IO queue, forcing previously
 147  *      submitted IO to be completed before this oen is issued.
 148  * bit 3 -- synchronous I/O hint: the block layer will unplug immediately
 149  *      Note that this does NOT indicate that the IO itself is sync, just
 150  *      that the block layer will not postpone issue of this IO by plugging.
 151  * bit 4 -- metadata request
 152  *      Used for tracing to differentiate metadata and data IO. May also
 153  *      get some preferential treatment in the IO scheduler
 154  * bit 5 -- discard sectors
 155  *      Informs the lower level device that this range of sectors is no longer
 156  *      used by the file system and may thus be freed by the device. Used
 157  *      for flash based storage.
 158  * bit 6 -- fail fast device errors
 159  * bit 7 -- fail fast transport errors
 160  * bit 8 -- fail fast driver errors
 161  *      Don't want driver retries for any fast fail whatever the reason.
 162  */
 163 #define BIO_RW          0       /* Must match RW in req flags (blkdev.h) */
 164 #define BIO_RW_AHEAD    1       /* Must match FAILFAST in req flags */
 165 #define BIO_RW_BARRIER  2
 166 #define BIO_RW_SYNC     3
 167 #define BIO_RW_META     4
 168 #define BIO_RW_DISCARD  5
 169 #define BIO_RW_FAILFAST_DEV             6
 170 #define BIO_RW_FAILFAST_TRANSPORT       7
 171 #define BIO_RW_FAILFAST_DRIVER          8
 172
 173 /*
 174  * upper 16 bits of bi_rw define the io priority of this bio
 175  */
 176 #define BIO_PRIO_SHIFT  (8 * sizeof(unsigned long) - IOPRIO_BITS)
 177 #define bio_prio(bio)   ((bio)->bi_rw >> BIO_PRIO_SHIFT)
 178 #define bio_prio_valid(bio)     ioprio_valid(bio_prio(bio))
 179
 180 #define bio_set_prio(bio, prio)         do {                    \
 181         WARN_ON(prio >= (1 << IOPRIO_BITS));                    \
 182         (bio)->bi_rw &= ((1UL << BIO_PRIO_SHIFT) - 1);          \
 183         (bio)->bi_rw |= ((unsigned long) (prio) << BIO_PRIO_SHIFT);     \
 184 } while (0)
 185
 186 /*
 187  * various member access, note that bio_data should of course not be used
 188  * on highmem page vectors
 189  */
 190 #define bio_iovec_idx(bio, idx) (&((bio)->bi_io_vec[(idx)]))
 191 #define bio_iovec(bio)          bio_iovec_idx((bio), (bio)->bi_idx)
 192 #define bio_page(bio)           bio_iovec((bio))->bv_page
 193 #define bio_offset(bio)         bio_iovec((bio))->bv_offset
 194 #define bio_segments(bio)       ((bio)->bi_vcnt - (bio)->bi_idx)
 195 #define bio_sectors(bio)        ((bio)->bi_size >> 9)
 196 #define bio_barrier(bio)        ((bio)->bi_rw & (1 << BIO_RW_BARRIER))
 197 #define bio_sync(bio)           ((bio)->bi_rw & (1 << BIO_RW_SYNC))
 198 #define bio_failfast_dev(bio)   ((bio)->bi_rw & (1 << BIO_RW_FAILFAST_DEV))
 199 #define bio_failfast_transport(bio)     \
 200         ((bio)->bi_rw & (1 << BIO_RW_FAILFAST_TRANSPORT))
 201 #define bio_failfast_driver(bio) ((bio)->bi_rw & (1 << BIO_RW_FAILFAST_DRIVER))
 202 #define bio_rw_ahead(bio)       ((bio)->bi_rw & (1 << BIO_RW_AHEAD))
 203 #define bio_rw_meta(bio)        ((bio)->bi_rw & (1 << BIO_RW_META))
 204 #define bio_discard(bio)        ((bio)->bi_rw & (1 << BIO_RW_DISCARD))
 205 #define bio_empty_barrier(bio)  (bio_barrier(bio) && !bio_has_data(bio) && !bio_discard(bio))
 206
 207 static inline unsigned int bio_cur_sectors(struct bio *bio)
 208 {
 209         if (bio->bi_vcnt)
 210                 return bio_iovec(bio)->bv_len >> 9;
 211         else /* dataless requests such as discard */
 212                 return bio->bi_size >> 9;
 213 }
 214
 215 static inline void *bio_data(struct bio *bio)
 216 {
 217         if (bio->bi_vcnt)
 218                 return page_address(bio_page(bio)) + bio_offset(bio);
 219
 220         return NULL;
 221 }
 222
 223 static inline int bio_has_allocated_vec(struct bio *bio)
 224 {
 225         return bio->bi_io_vec && bio->bi_io_vec != bio->bi_inline_vecs;
 226 }
 227
 228 /*
 229  * will die
 230  */
 231 #define bio_to_phys(bio)        (page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio)))
 232 #define bvec_to_phys(bv)        (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset)
 233
 234 /*
 235  * queues that have highmem support enabled may still need to revert to
 236  * PIO transfers occasionally and thus map high pages temporarily. For
 237  * permanent PIO fall back, user is probably better off disabling highmem
 238  * I/O completely on that queue (see ide-dma for example)
 239  */
 240 #define __bio_kmap_atomic(bio, idx, kmtype)                             \
 241         (kmap_atomic(bio_iovec_idx((bio), (idx))->bv_page, kmtype) +    \
 242                 bio_iovec_idx((bio), (idx))->bv_offset)
 243
 244 #define __bio_kunmap_atomic(addr, kmtype) kunmap_atomic(addr, kmtype)
 245
 246 /*
 247  * merge helpers etc
 248  */
 249
 250 #define __BVEC_END(bio)         bio_iovec_idx((bio), (bio)->bi_vcnt - 1)
 251 #define __BVEC_START(bio)       bio_iovec_idx((bio), (bio)->bi_idx)
 252
 253 /* Default implementation of BIOVEC_PHYS_MERGEABLE */
 254 #define __BIOVEC_PHYS_MERGEABLE(vec1, vec2)     \
 255         ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
 256
 257 /*
 258  * allow arch override, for eg virtualized architectures (put in asm/io.h)
 259  */
 260 #ifndef BIOVEC_PHYS_MERGEABLE
 261 #define BIOVEC_PHYS_MERGEABLE(vec1, vec2)       \
 262         __BIOVEC_PHYS_MERGEABLE(vec1, vec2)
 263 #endif
 264
 265 #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \
 266         (((addr1) | (mask)) == (((addr2) - 1) | (mask)))
 267 #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \
 268         __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, (q)->seg_boundary_mask)
 269 #define BIO_SEG_BOUNDARY(q, b1, b2) \
 270         BIOVEC_SEG_BOUNDARY((q), __BVEC_END((b1)), __BVEC_START((b2)))
 271
 272 #define bio_io_error(bio) bio_endio((bio), -EIO)
 273
 274 /*
 275  * drivers should not use the __ version unless they _really_ want to
 276  * run through the entire bio and not just pending pieces
 277  */
 278 #define __bio_for_each_segment(bvl, bio, i, start_idx)                  \
 279         for (bvl = bio_iovec_idx((bio), (start_idx)), i = (start_idx);  \
 280              i < (bio)->bi_vcnt;                                        \
 281              bvl++, i++)
 282
 283 #define bio_for_each_segment(bvl, bio, i)                               \
 284         __bio_for_each_segment(bvl, bio, i, (bio)->bi_idx)
 285
 286 /*
 287  * get a reference to a bio, so it won't disappear. the intended use is
 288  * something like:
 289  *
 290  * bio_get(bio);
 291  * submit_bio(rw, bio);
 292  * if (bio->bi_flags ...)
 293  *      do_something
 294  * bio_put(bio);
 295  *
 296  * without the bio_get(), it could potentially complete I/O before submit_bio
 297  * returns. and then bio would be freed memory when if (bio->bi_flags ...)
 298  * runs
 299  */
 300 #define bio_get(bio)    atomic_inc(&(bio)->bi_cnt)
 301
 302 #if defined(CONFIG_BLK_DEV_INTEGRITY)
 303 /*
 304  * bio integrity payload
 305  */
 306 struct bio_integrity_payload {
 307         struct bio              *bip_bio;       /* parent bio */
 308         struct bio_vec          *bip_vec;       /* integrity data vector */
 309
 310         sector_t                bip_sector;     /* virtual start sector */
 311
 312         void                    *bip_buf;       /* generated integrity data */
 313         bio_end_io_t            *bip_end_io;    /* saved I/O completion fn */
 314
 315         unsigned int            bip_size;
 316
 317         unsigned short          bip_pool;       /* pool the ivec came from */
 318         unsigned short          bip_vcnt;       /* # of integrity bio_vecs */
 319         unsigned short          bip_idx;        /* current bip_vec index */
 320
 321         struct work_struct      bip_work;       /* I/O completion */
 322 };
 323 #endif /* CONFIG_BLK_DEV_INTEGRITY */
 324
 325 /*
 326  * A bio_pair is used when we need to split a bio.
 327  * This can only happen for a bio that refers to just one
 328  * page of data, and in the unusual situation when the
 329  * page crosses a chunk/device boundary
 330  *
 331  * The address of the master bio is stored in bio1.bi_private
 332  * The address of the pool the pair was allocated from is stored
 333  *   in bio2.bi_private
 334  */
 335 struct bio_pair {
 336         struct bio                      bio1, bio2;
 337         struct bio_vec                  bv1, bv2;
 338 #if defined(CONFIG_BLK_DEV_INTEGRITY)
 339         struct bio_integrity_payload    bip1, bip2;
 340         struct bio_vec                  iv1, iv2;
 341 #endif
 342         atomic_t                        cnt;
 343         int                             error;
 344 };
 345 extern struct bio_pair *bio_split(struct bio *bi, int first_sectors);
 346 extern void bio_pair_release(struct bio_pair *dbio);
 347
 348 extern struct bio_set *bioset_create(unsigned int, unsigned int);
 349 extern void bioset_free(struct bio_set *);
 350
 351 extern struct bio *bio_alloc(gfp_t, int);
 352 extern struct bio *bio_kmalloc(gfp_t, int);
 353 extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *);
 354 extern void bio_put(struct bio *);
 355 extern void bio_free(struct bio *, struct bio_set *);
 356
 357 extern void bio_endio(struct bio *, int);
 358 struct request_queue;
 359 extern int bio_phys_segments(struct request_queue *, struct bio *);
 360
 361 extern void __bio_clone(struct bio *, struct bio *);
 362 extern struct bio *bio_clone(struct bio *, gfp_t);
 363
 364 extern void bio_init(struct bio *);
 365
 366 extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int);
 367 extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *,
 368                            unsigned int, unsigned int);
 369 extern int bio_get_nr_vecs(struct block_device *);
 370 extern sector_t bio_sector_offset(struct bio *, unsigned short, unsigned int);
 371 extern struct bio *bio_map_user(struct request_queue *, struct block_device *,
 372                                 unsigned long, unsigned int, int, gfp_t);
 373 struct sg_iovec;
 374 struct rq_map_data;
 375 extern struct bio *bio_map_user_iov(struct request_queue *,
 376                                     struct block_device *,
 377                                     struct sg_iovec *, int, int, gfp_t);
 378 extern void bio_unmap_user(struct bio *);
 379 extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int,
 380                                 gfp_t);
 381 extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int,
 382                                  gfp_t, int);
 383 extern void bio_set_pages_dirty(struct bio *bio);
 384 extern void bio_check_pages_dirty(struct bio *bio);
 385 extern struct bio *bio_copy_user(struct request_queue *, struct rq_map_data *,
 386                                  unsigned long, unsigned int, int, gfp_t);
 387 extern struct bio *bio_copy_user_iov(struct request_queue *,
 388                                      struct rq_map_data *, struct sg_iovec *,
 389                                      int, int, gfp_t);
 390 extern int bio_uncopy_user(struct bio *);
 391 void zero_fill_bio(struct bio *bio);
 392 extern struct bio_vec *bvec_alloc_bs(gfp_t, int, unsigned long *, struct bio_set *);
 393 extern void bvec_free_bs(struct bio_set *, struct bio_vec *, unsigned int);
 394 extern unsigned int bvec_nr_vecs(unsigned short idx);
 395
 396 /*
 397  * Allow queuer to specify a completion CPU for this bio
 398  */
 399 static inline void bio_set_completion_cpu(struct bio *bio, unsigned int cpu)
 400 {
 401         bio->bi_comp_cpu = cpu;
 402 }
 403
 404 /*
 405  * bio_set is used to allow other portions of the IO system to
 406  * allocate their own private memory pools for bio and iovec structures.
 407  * These memory pools in turn all allocate from the bio_slab
 408  * and the bvec_slabs[].
 409  */
 410 #define BIO_POOL_SIZE 2
 411 #define BIOVEC_NR_POOLS 6
 412 #define BIOVEC_MAX_IDX  (BIOVEC_NR_POOLS - 1)
 413
 414 struct bio_set {
 415         struct kmem_cache *bio_slab;
 416         unsigned int front_pad;
 417
 418         mempool_t *bio_pool;
 419 #if defined(CONFIG_BLK_DEV_INTEGRITY)
 420         mempool_t *bio_integrity_pool;
 421 #endif
 422         mempool_t *bvec_pool;
 423 };
 424
 425 struct biovec_slab {
 426         int nr_vecs;
 427         char *name;
 428         struct kmem_cache *slab;
 429 };
 430
 431 extern struct bio_set *fs_bio_set;
 432 extern struct biovec_slab bvec_slabs[BIOVEC_NR_POOLS] __read_mostly;
 433
 434 /*
 435  * a small number of entries is fine, not going to be performance critical.
 436  * basically we just need to survive
 437  */
 438 #define BIO_SPLIT_ENTRIES 2
 439
 440 #ifdef CONFIG_HIGHMEM
 441 /*
 442  * remember to add offset! and never ever reenable interrupts between a
 443  * bvec_kmap_irq and bvec_kunmap_irq!!
 444  *
 445  * This function MUST be inlined - it plays with the CPU interrupt flags.
 446  */
 447 static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags)
 448 {
 449         unsigned long addr;
 450
 451         /*
 452          * might not be a highmem page, but the preempt/irq count
 453          * balancing is a lot nicer this way
 454          */
 455         local_irq_save(*flags);
 456         addr = (unsigned long) kmap_atomic(bvec->bv_page, KM_BIO_SRC_IRQ);
 457
 458         BUG_ON(addr & ~PAGE_MASK);
 459
 460         return (char *) addr + bvec->bv_offset;
 461 }
 462
 463 static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags)
 464 {
 465         unsigned long ptr = (unsigned long) buffer & PAGE_MASK;
 466
 467         kunmap_atomic((void *) ptr, KM_BIO_SRC_IRQ);
 468         local_irq_restore(*flags);
 469 }
 470
 471 #else
 472 #define bvec_kmap_irq(bvec, flags)      (page_address((bvec)->bv_page) + (bvec)->bv_offset)
 473 #define bvec_kunmap_irq(buf, flags)     do { *(flags) = 0; } while (0)
 474 #endif
 475
 476 static inline char *__bio_kmap_irq(struct bio *bio, unsigned short idx,
 477                                    unsigned long *flags)
 478 {
 479         return bvec_kmap_irq(bio_iovec_idx(bio, idx), flags);
 480 }
 481 #define __bio_kunmap_irq(buf, flags)    bvec_kunmap_irq(buf, flags)
 482
 483 #define bio_kmap_irq(bio, flags) \
 484         __bio_kmap_irq((bio), (bio)->bi_idx, (flags))
 485 #define bio_kunmap_irq(buf,flags)       __bio_kunmap_irq(buf, flags)
 486
 487 /*
 488  * Check whether this bio carries any data or not. A NULL bio is allowed.
 489  */
 490 static inline int bio_has_data(struct bio *bio)
 491 {
 492         return bio && bio->bi_io_vec != NULL;
 493 }
 494
 495 #if defined(CONFIG_BLK_DEV_INTEGRITY)
 496
 497 #define bip_vec_idx(bip, idx)   (&(bip->bip_vec[(idx)]))
 498 #define bip_vec(bip)            bip_vec_idx(bip, 0)
 499
 500 #define __bip_for_each_vec(bvl, bip, i, start_idx)                      \
 501         for (bvl = bip_vec_idx((bip), (start_idx)), i = (start_idx);    \
 502              i < (bip)->bip_vcnt;                                       \
 503              bvl++, i++)
 504
 505 #define bip_for_each_vec(bvl, bip, i)                                   \
 506         __bip_for_each_vec(bvl, bip, i, (bip)->bip_idx)
 507
 508 #define bio_integrity(bio) (bio->bi_integrity != NULL)
 509
 510 extern struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *, gfp_t, unsigned int, struct bio_set *);
 511 extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int);
 512 extern void bio_integrity_free(struct bio *, struct bio_set *);
 513 extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int);
 514 extern int bio_integrity_enabled(struct bio *bio);
 515 extern int bio_integrity_set_tag(struct bio *, void *, unsigned int);
 516 extern int bio_integrity_get_tag(struct bio *, void *, unsigned int);
 517 extern int bio_integrity_prep(struct bio *);
 518 extern void bio_integrity_endio(struct bio *, int);
 519 extern void bio_integrity_advance(struct bio *, unsigned int);
 520 extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int);
 521 extern void bio_integrity_split(struct bio *, struct bio_pair *, int);
 522 extern int bio_integrity_clone(struct bio *, struct bio *, struct bio_set *);
 523 extern int bioset_integrity_create(struct bio_set *, int);
 524 extern void bioset_integrity_free(struct bio_set *);
 525 extern void bio_integrity_init_slab(void);
 526
 527 #else /* CONFIG_BLK_DEV_INTEGRITY */
 528
 529 #define bio_integrity(a)                (0)
 530 #define bioset_integrity_create(a, b)   (0)
 531 #define bio_integrity_prep(a)           (0)
 532 #define bio_integrity_enabled(a)        (0)
 533 #define bio_integrity_clone(a, b, c)    (0)
 534 #define bioset_integrity_free(a)        do { } while (0)
 535 #define bio_integrity_free(a, b)        do { } while (0)
 536 #define bio_integrity_endio(a, b)       do { } while (0)
 537 #define bio_integrity_advance(a, b)     do { } while (0)
 538 #define bio_integrity_trim(a, b, c)     do { } while (0)
 539 #define bio_integrity_split(a, b, c)    do { } while (0)
 540 #define bio_integrity_set_tag(a, b, c)  do { } while (0)
 541 #define bio_integrity_get_tag(a, b, c)  do { } while (0)
 542 #define bio_integrity_init_slab(a)      do { } while (0)
 543
 544 #endif /* CONFIG_BLK_DEV_INTEGRITY */
 545
 546 #endif /* CONFIG_BLOCK */
 547 #endif /* __LINUX_BIO_H */