4 * Copyright (C) 2001 Jens Axboe <axboe@suse.de>
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.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
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-
23 #include <linux/highmem.h>
24 #include <linux/mempool.h>
25 #include <linux/ioprio.h>
34 #define BIO_BUG_ON BUG_ON
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)
44 * was unsigned short, but we might as well be ready for > 64kB I/O pages
49 unsigned int bv_offset;
54 struct bio_integrity_payload;
55 typedef void (bio_end_io_t) (struct bio *, int);
56 typedef void (bio_destructor_t) (struct bio *);
59 * main unit of I/O for the block layer and lower layers (ie drivers and
63 sector_t bi_sector; /* device address in 512 byte
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,
72 unsigned short bi_vcnt; /* how many bio_vec's */
73 unsigned short bi_idx; /* current index into bvl_vec */
75 /* Number of segments in this BIO after
76 * physical address coalescing is performed.
78 unsigned int bi_phys_segments;
80 unsigned int bi_size; /* residual I/O count */
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.
86 unsigned int bi_seg_front_size;
87 unsigned int bi_seg_back_size;
89 unsigned int bi_max_vecs; /* max bvl_vecs we can hold */
91 unsigned int bi_comp_cpu; /* completion CPU */
93 atomic_t bi_cnt; /* pin count */
95 struct bio_vec *bi_io_vec; /* the actual vec list */
97 bio_end_io_t *bi_end_io;
100 #if defined(CONFIG_BLK_DEV_INTEGRITY)
101 struct bio_integrity_payload *bi_integrity; /* data integrity */
104 bio_destructor_t *bi_destructor; /* destructor */
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.
111 struct bio_vec bi_inline_vecs[0];
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)))
132 * top 4 bits of bio flags indicate the pool this bio came from
134 #define BIO_POOL_BITS (4)
135 #define BIO_POOL_NONE ((1UL << BIO_POOL_BITS) - 1)
136 #define BIO_POOL_OFFSET (BITS_PER_LONG - BIO_POOL_BITS)
137 #define BIO_POOL_MASK (1UL << BIO_POOL_OFFSET)
138 #define BIO_POOL_IDX(bio) ((bio)->bi_flags >> BIO_POOL_OFFSET)
141 * Request flags. For use in the cmd_flags field of struct request, and in
142 * bi_rw of struct bio. Note that some flags are only valid in either one.
146 __REQ_WRITE, /* not set, read. set, write */
147 __REQ_FAILFAST_DEV, /* no driver retries of device errors */
148 __REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */
149 __REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */
151 __REQ_HARDBARRIER, /* may not be passed by drive either */
152 __REQ_SYNC, /* request is sync (sync write or read) */
153 __REQ_META, /* metadata io request */
154 __REQ_DISCARD, /* request to discard sectors */
155 __REQ_NOIDLE, /* don't anticipate more IO after this one */
158 __REQ_UNPLUG, /* unplug the immediately after submission */
159 __REQ_RAHEAD, /* read ahead, can fail anytime */
161 /* request only flags */
162 __REQ_SORTED, /* elevator knows about this request */
163 __REQ_SOFTBARRIER, /* may not be passed by ioscheduler */
164 __REQ_FUA, /* forced unit access */
165 __REQ_NOMERGE, /* don't touch this for merging */
166 __REQ_STARTED, /* drive already may have started this one */
167 __REQ_DONTPREP, /* don't call prep for this one */
168 __REQ_QUEUED, /* uses queueing */
169 __REQ_ELVPRIV, /* elevator private data attached */
170 __REQ_FAILED, /* set if the request failed */
171 __REQ_QUIET, /* don't worry about errors */
172 __REQ_PREEMPT, /* set for "ide_preempt" requests */
173 __REQ_ORDERED_COLOR, /* is before or after barrier */
174 __REQ_ALLOCED, /* request came from our alloc pool */
175 __REQ_COPY_USER, /* contains copies of user pages */
176 __REQ_INTEGRITY, /* integrity metadata has been remapped */
177 __REQ_FLUSH, /* request for cache flush */
178 __REQ_IO_STAT, /* account I/O stat */
179 __REQ_MIXED_MERGE, /* merge of different types, fail separately */
180 __REQ_NR_BITS, /* stops here */
183 #define REQ_WRITE (1 << __REQ_WRITE)
184 #define REQ_FAILFAST_DEV (1 << __REQ_FAILFAST_DEV)
185 #define REQ_FAILFAST_TRANSPORT (1 << __REQ_FAILFAST_TRANSPORT)
186 #define REQ_FAILFAST_DRIVER (1 << __REQ_FAILFAST_DRIVER)
187 #define REQ_HARDBARRIER (1 << __REQ_HARDBARRIER)
188 #define REQ_SYNC (1 << __REQ_SYNC)
189 #define REQ_META (1 << __REQ_META)
190 #define REQ_DISCARD (1 << __REQ_DISCARD)
191 #define REQ_NOIDLE (1 << __REQ_NOIDLE)
193 #define REQ_FAILFAST_MASK \
194 (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER)
195 #define REQ_COMMON_MASK \
196 (REQ_WRITE | REQ_FAILFAST_MASK | REQ_HARDBARRIER | REQ_SYNC | \
197 REQ_META| REQ_DISCARD | REQ_NOIDLE)
199 #define REQ_UNPLUG (1 << __REQ_UNPLUG)
200 #define REQ_RAHEAD (1 << __REQ_RAHEAD)
202 #define REQ_SORTED (1 << __REQ_SORTED)
203 #define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER)
204 #define REQ_FUA (1 << __REQ_FUA)
205 #define REQ_NOMERGE (1 << __REQ_NOMERGE)
206 #define REQ_STARTED (1 << __REQ_STARTED)
207 #define REQ_DONTPREP (1 << __REQ_DONTPREP)
208 #define REQ_QUEUED (1 << __REQ_QUEUED)
209 #define REQ_ELVPRIV (1 << __REQ_ELVPRIV)
210 #define REQ_FAILED (1 << __REQ_FAILED)
211 #define REQ_QUIET (1 << __REQ_QUIET)
212 #define REQ_PREEMPT (1 << __REQ_PREEMPT)
213 #define REQ_ORDERED_COLOR (1 << __REQ_ORDERED_COLOR)
214 #define REQ_ALLOCED (1 << __REQ_ALLOCED)
215 #define REQ_COPY_USER (1 << __REQ_COPY_USER)
216 #define REQ_INTEGRITY (1 << __REQ_INTEGRITY)
217 #define REQ_FLUSH (1 << __REQ_FLUSH)
218 #define REQ_IO_STAT (1 << __REQ_IO_STAT)
219 #define REQ_MIXED_MERGE (1 << __REQ_MIXED_MERGE)
222 * upper 16 bits of bi_rw define the io priority of this bio
224 #define BIO_PRIO_SHIFT (8 * sizeof(unsigned long) - IOPRIO_BITS)
225 #define bio_prio(bio) ((bio)->bi_rw >> BIO_PRIO_SHIFT)
226 #define bio_prio_valid(bio) ioprio_valid(bio_prio(bio))
228 #define bio_set_prio(bio, prio) do { \
229 WARN_ON(prio >= (1 << IOPRIO_BITS)); \
230 (bio)->bi_rw &= ((1UL << BIO_PRIO_SHIFT) - 1); \
231 (bio)->bi_rw |= ((unsigned long) (prio) << BIO_PRIO_SHIFT); \
235 * various member access, note that bio_data should of course not be used
236 * on highmem page vectors
238 #define bio_iovec_idx(bio, idx) (&((bio)->bi_io_vec[(idx)]))
239 #define bio_iovec(bio) bio_iovec_idx((bio), (bio)->bi_idx)
240 #define bio_page(bio) bio_iovec((bio))->bv_page
241 #define bio_offset(bio) bio_iovec((bio))->bv_offset
242 #define bio_segments(bio) ((bio)->bi_vcnt - (bio)->bi_idx)
243 #define bio_sectors(bio) ((bio)->bi_size >> 9)
244 #define bio_empty_barrier(bio) \
245 ((bio->bi_rw & REQ_HARDBARRIER) && \
246 !bio_has_data(bio) && \
247 !(bio->bi_rw & REQ_DISCARD))
249 static inline unsigned int bio_cur_bytes(struct bio *bio)
252 return bio_iovec(bio)->bv_len;
253 else /* dataless requests such as discard */
257 static inline void *bio_data(struct bio *bio)
260 return page_address(bio_page(bio)) + bio_offset(bio);
265 static inline int bio_has_allocated_vec(struct bio *bio)
267 return bio->bi_io_vec && bio->bi_io_vec != bio->bi_inline_vecs;
273 #define bio_to_phys(bio) (page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio)))
274 #define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset)
277 * queues that have highmem support enabled may still need to revert to
278 * PIO transfers occasionally and thus map high pages temporarily. For
279 * permanent PIO fall back, user is probably better off disabling highmem
280 * I/O completely on that queue (see ide-dma for example)
282 #define __bio_kmap_atomic(bio, idx, kmtype) \
283 (kmap_atomic(bio_iovec_idx((bio), (idx))->bv_page, kmtype) + \
284 bio_iovec_idx((bio), (idx))->bv_offset)
286 #define __bio_kunmap_atomic(addr, kmtype) kunmap_atomic(addr, kmtype)
292 #define __BVEC_END(bio) bio_iovec_idx((bio), (bio)->bi_vcnt - 1)
293 #define __BVEC_START(bio) bio_iovec_idx((bio), (bio)->bi_idx)
295 /* Default implementation of BIOVEC_PHYS_MERGEABLE */
296 #define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
297 ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
300 * allow arch override, for eg virtualized architectures (put in asm/io.h)
302 #ifndef BIOVEC_PHYS_MERGEABLE
303 #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
304 __BIOVEC_PHYS_MERGEABLE(vec1, vec2)
307 #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \
308 (((addr1) | (mask)) == (((addr2) - 1) | (mask)))
309 #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \
310 __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q)))
311 #define BIO_SEG_BOUNDARY(q, b1, b2) \
312 BIOVEC_SEG_BOUNDARY((q), __BVEC_END((b1)), __BVEC_START((b2)))
314 #define bio_io_error(bio) bio_endio((bio), -EIO)
317 * drivers should not use the __ version unless they _really_ want to
318 * run through the entire bio and not just pending pieces
320 #define __bio_for_each_segment(bvl, bio, i, start_idx) \
321 for (bvl = bio_iovec_idx((bio), (start_idx)), i = (start_idx); \
322 i < (bio)->bi_vcnt; \
325 #define bio_for_each_segment(bvl, bio, i) \
326 __bio_for_each_segment(bvl, bio, i, (bio)->bi_idx)
329 * get a reference to a bio, so it won't disappear. the intended use is
333 * submit_bio(rw, bio);
334 * if (bio->bi_flags ...)
338 * without the bio_get(), it could potentially complete I/O before submit_bio
339 * returns. and then bio would be freed memory when if (bio->bi_flags ...)
342 #define bio_get(bio) atomic_inc(&(bio)->bi_cnt)
344 #if defined(CONFIG_BLK_DEV_INTEGRITY)
346 * bio integrity payload
348 struct bio_integrity_payload {
349 struct bio *bip_bio; /* parent bio */
351 sector_t bip_sector; /* virtual start sector */
353 void *bip_buf; /* generated integrity data */
354 bio_end_io_t *bip_end_io; /* saved I/O completion fn */
356 unsigned int bip_size;
358 unsigned short bip_slab; /* slab the bip came from */
359 unsigned short bip_vcnt; /* # of integrity bio_vecs */
360 unsigned short bip_idx; /* current bip_vec index */
362 struct work_struct bip_work; /* I/O completion */
363 struct bio_vec bip_vec[0]; /* embedded bvec array */
365 #endif /* CONFIG_BLK_DEV_INTEGRITY */
368 * A bio_pair is used when we need to split a bio.
369 * This can only happen for a bio that refers to just one
370 * page of data, and in the unusual situation when the
371 * page crosses a chunk/device boundary
373 * The address of the master bio is stored in bio1.bi_private
374 * The address of the pool the pair was allocated from is stored
378 struct bio bio1, bio2;
379 struct bio_vec bv1, bv2;
380 #if defined(CONFIG_BLK_DEV_INTEGRITY)
381 struct bio_integrity_payload bip1, bip2;
382 struct bio_vec iv1, iv2;
387 extern struct bio_pair *bio_split(struct bio *bi, int first_sectors);
388 extern void bio_pair_release(struct bio_pair *dbio);
390 extern struct bio_set *bioset_create(unsigned int, unsigned int);
391 extern void bioset_free(struct bio_set *);
393 extern struct bio *bio_alloc(gfp_t, int);
394 extern struct bio *bio_kmalloc(gfp_t, int);
395 extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *);
396 extern void bio_put(struct bio *);
397 extern void bio_free(struct bio *, struct bio_set *);
399 extern void bio_endio(struct bio *, int);
400 struct request_queue;
401 extern int bio_phys_segments(struct request_queue *, struct bio *);
403 extern void __bio_clone(struct bio *, struct bio *);
404 extern struct bio *bio_clone(struct bio *, gfp_t);
406 extern void bio_init(struct bio *);
408 extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int);
409 extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *,
410 unsigned int, unsigned int);
411 extern int bio_get_nr_vecs(struct block_device *);
412 extern sector_t bio_sector_offset(struct bio *, unsigned short, unsigned int);
413 extern struct bio *bio_map_user(struct request_queue *, struct block_device *,
414 unsigned long, unsigned int, int, gfp_t);
417 extern struct bio *bio_map_user_iov(struct request_queue *,
418 struct block_device *,
419 struct sg_iovec *, int, int, gfp_t);
420 extern void bio_unmap_user(struct bio *);
421 extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int,
423 extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int,
425 extern void bio_set_pages_dirty(struct bio *bio);
426 extern void bio_check_pages_dirty(struct bio *bio);
428 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
429 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
431 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
432 extern void bio_flush_dcache_pages(struct bio *bi);
434 static inline void bio_flush_dcache_pages(struct bio *bi)
439 extern struct bio *bio_copy_user(struct request_queue *, struct rq_map_data *,
440 unsigned long, unsigned int, int, gfp_t);
441 extern struct bio *bio_copy_user_iov(struct request_queue *,
442 struct rq_map_data *, struct sg_iovec *,
444 extern int bio_uncopy_user(struct bio *);
445 void zero_fill_bio(struct bio *bio);
446 extern struct bio_vec *bvec_alloc_bs(gfp_t, int, unsigned long *, struct bio_set *);
447 extern void bvec_free_bs(struct bio_set *, struct bio_vec *, unsigned int);
448 extern unsigned int bvec_nr_vecs(unsigned short idx);
451 * Allow queuer to specify a completion CPU for this bio
453 static inline void bio_set_completion_cpu(struct bio *bio, unsigned int cpu)
455 bio->bi_comp_cpu = cpu;
459 * bio_set is used to allow other portions of the IO system to
460 * allocate their own private memory pools for bio and iovec structures.
461 * These memory pools in turn all allocate from the bio_slab
462 * and the bvec_slabs[].
464 #define BIO_POOL_SIZE 2
465 #define BIOVEC_NR_POOLS 6
466 #define BIOVEC_MAX_IDX (BIOVEC_NR_POOLS - 1)
469 struct kmem_cache *bio_slab;
470 unsigned int front_pad;
473 #if defined(CONFIG_BLK_DEV_INTEGRITY)
474 mempool_t *bio_integrity_pool;
476 mempool_t *bvec_pool;
482 struct kmem_cache *slab;
485 extern struct bio_set *fs_bio_set;
486 extern struct biovec_slab bvec_slabs[BIOVEC_NR_POOLS] __read_mostly;
489 * a small number of entries is fine, not going to be performance critical.
490 * basically we just need to survive
492 #define BIO_SPLIT_ENTRIES 2
494 #ifdef CONFIG_HIGHMEM
496 * remember never ever reenable interrupts between a bvec_kmap_irq and
499 static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags)
504 * might not be a highmem page, but the preempt/irq count
505 * balancing is a lot nicer this way
507 local_irq_save(*flags);
508 addr = (unsigned long) kmap_atomic(bvec->bv_page, KM_BIO_SRC_IRQ);
510 BUG_ON(addr & ~PAGE_MASK);
512 return (char *) addr + bvec->bv_offset;
515 static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags)
517 unsigned long ptr = (unsigned long) buffer & PAGE_MASK;
519 kunmap_atomic((void *) ptr, KM_BIO_SRC_IRQ);
520 local_irq_restore(*flags);
524 #define bvec_kmap_irq(bvec, flags) (page_address((bvec)->bv_page) + (bvec)->bv_offset)
525 #define bvec_kunmap_irq(buf, flags) do { *(flags) = 0; } while (0)
528 static inline char *__bio_kmap_irq(struct bio *bio, unsigned short idx,
529 unsigned long *flags)
531 return bvec_kmap_irq(bio_iovec_idx(bio, idx), flags);
533 #define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags)
535 #define bio_kmap_irq(bio, flags) \
536 __bio_kmap_irq((bio), (bio)->bi_idx, (flags))
537 #define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags)
540 * Check whether this bio carries any data or not. A NULL bio is allowed.
542 static inline int bio_has_data(struct bio *bio)
544 return bio && bio->bi_io_vec != NULL;
548 * BIO list management for use by remapping drivers (e.g. DM or MD) and loop.
550 * A bio_list anchors a singly-linked list of bios chained through the bi_next
551 * member of the bio. The bio_list also caches the last list member to allow
552 * fast access to the tail.
559 static inline int bio_list_empty(const struct bio_list *bl)
561 return bl->head == NULL;
564 static inline void bio_list_init(struct bio_list *bl)
566 bl->head = bl->tail = NULL;
569 #define bio_list_for_each(bio, bl) \
570 for (bio = (bl)->head; bio; bio = bio->bi_next)
572 static inline unsigned bio_list_size(const struct bio_list *bl)
577 bio_list_for_each(bio, bl)
583 static inline void bio_list_add(struct bio_list *bl, struct bio *bio)
588 bl->tail->bi_next = bio;
595 static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio)
597 bio->bi_next = bl->head;
605 static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2)
611 bl->tail->bi_next = bl2->head;
613 bl->head = bl2->head;
615 bl->tail = bl2->tail;
618 static inline void bio_list_merge_head(struct bio_list *bl,
619 struct bio_list *bl2)
625 bl2->tail->bi_next = bl->head;
627 bl->tail = bl2->tail;
629 bl->head = bl2->head;
632 static inline struct bio *bio_list_peek(struct bio_list *bl)
637 static inline struct bio *bio_list_pop(struct bio_list *bl)
639 struct bio *bio = bl->head;
642 bl->head = bl->head->bi_next;
652 static inline struct bio *bio_list_get(struct bio_list *bl)
654 struct bio *bio = bl->head;
656 bl->head = bl->tail = NULL;
661 #if defined(CONFIG_BLK_DEV_INTEGRITY)
663 #define bip_vec_idx(bip, idx) (&(bip->bip_vec[(idx)]))
664 #define bip_vec(bip) bip_vec_idx(bip, 0)
666 #define __bip_for_each_vec(bvl, bip, i, start_idx) \
667 for (bvl = bip_vec_idx((bip), (start_idx)), i = (start_idx); \
668 i < (bip)->bip_vcnt; \
671 #define bip_for_each_vec(bvl, bip, i) \
672 __bip_for_each_vec(bvl, bip, i, (bip)->bip_idx)
674 #define bio_integrity(bio) (bio->bi_integrity != NULL)
676 extern struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *, gfp_t, unsigned int, struct bio_set *);
677 extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int);
678 extern void bio_integrity_free(struct bio *, struct bio_set *);
679 extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int);
680 extern int bio_integrity_enabled(struct bio *bio);
681 extern int bio_integrity_set_tag(struct bio *, void *, unsigned int);
682 extern int bio_integrity_get_tag(struct bio *, void *, unsigned int);
683 extern int bio_integrity_prep(struct bio *);
684 extern void bio_integrity_endio(struct bio *, int);
685 extern void bio_integrity_advance(struct bio *, unsigned int);
686 extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int);
687 extern void bio_integrity_split(struct bio *, struct bio_pair *, int);
688 extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t, struct bio_set *);
689 extern int bioset_integrity_create(struct bio_set *, int);
690 extern void bioset_integrity_free(struct bio_set *);
691 extern void bio_integrity_init(void);
693 #else /* CONFIG_BLK_DEV_INTEGRITY */
695 #define bio_integrity(a) (0)
696 #define bioset_integrity_create(a, b) (0)
697 #define bio_integrity_prep(a) (0)
698 #define bio_integrity_enabled(a) (0)
699 #define bio_integrity_clone(a, b, c, d) (0)
700 #define bioset_integrity_free(a) do { } while (0)
701 #define bio_integrity_free(a, b) do { } while (0)
702 #define bio_integrity_endio(a, b) do { } while (0)
703 #define bio_integrity_advance(a, b) do { } while (0)
704 #define bio_integrity_trim(a, b, c) do { } while (0)
705 #define bio_integrity_split(a, b, c) do { } while (0)
706 #define bio_integrity_set_tag(a, b, c) do { } while (0)
707 #define bio_integrity_get_tag(a, b, c) do { } while (0)
708 #define bio_integrity_init(a) do { } while (0)
710 #endif /* CONFIG_BLK_DEV_INTEGRITY */
712 #endif /* CONFIG_BLOCK */
713 #endif /* __LINUX_BIO_H */