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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 __bvec_iter_bvec(bvec, iter) (&(bvec)[(iter).bi_idx])
65
66 #define bvec_iter_page(bvec, iter) \
67 (__bvec_iter_bvec((bvec), (iter))->bv_page)
68
69 #define bvec_iter_len(bvec, iter) \
70 min((iter).bi_size, \
71 __bvec_iter_bvec((bvec), (iter))->bv_len - (iter).bi_bvec_done)
72
73 #define bvec_iter_offset(bvec, iter) \
74 (__bvec_iter_bvec((bvec), (iter))->bv_offset + (iter).bi_bvec_done)
75
76 #define bvec_iter_bvec(bvec, iter) \
77 ((struct bio_vec) { \
78 .bv_page = bvec_iter_page((bvec), (iter)), \
79 .bv_len = bvec_iter_len((bvec), (iter)), \
80 .bv_offset = bvec_iter_offset((bvec), (iter)), \
81 })
82
83 #define bio_iter_iovec(bio, iter) \
84 bvec_iter_bvec((bio)->bi_io_vec, (iter))
85
86 #define bio_iter_page(bio, iter) \
87 bvec_iter_page((bio)->bi_io_vec, (iter))
88 #define bio_iter_len(bio, iter) \
89 bvec_iter_len((bio)->bi_io_vec, (iter))
90 #define bio_iter_offset(bio, iter) \
91 bvec_iter_offset((bio)->bi_io_vec, (iter))
92
93 #define bio_page(bio) bio_iter_page((bio), (bio)->bi_iter)
94 #define bio_offset(bio) bio_iter_offset((bio), (bio)->bi_iter)
95 #define bio_iovec(bio) bio_iter_iovec((bio), (bio)->bi_iter)
96
97 #define bio_multiple_segments(bio) \
98 ((bio)->bi_iter.bi_size != bio_iovec(bio).bv_len)
99 #define bio_sectors(bio) ((bio)->bi_iter.bi_size >> 9)
100 #define bio_end_sector(bio) ((bio)->bi_iter.bi_sector + bio_sectors((bio)))
101
102 /*
103 * Check whether this bio carries any data or not. A NULL bio is allowed.
104 */
105 static inline bool bio_has_data(struct bio *bio)
106 {
107 if (bio &&
108 bio->bi_iter.bi_size &&
109 !(bio->bi_rw & REQ_DISCARD))
110 return true;
111
112 return false;
113 }
114
115 static inline bool bio_is_rw(struct bio *bio)
116 {
117 if (!bio_has_data(bio))
118 return false;
119
120 if (bio->bi_rw & BIO_NO_ADVANCE_ITER_MASK)
121 return false;
122
123 return true;
124 }
125
126 static inline bool bio_mergeable(struct bio *bio)
127 {
128 if (bio->bi_rw & REQ_NOMERGE_FLAGS)
129 return false;
130
131 return true;
132 }
133
134 static inline unsigned int bio_cur_bytes(struct bio *bio)
135 {
136 if (bio_has_data(bio))
137 return bio_iovec(bio).bv_len;
138 else /* dataless requests such as discard */
139 return bio->bi_iter.bi_size;
140 }
141
142 static inline void *bio_data(struct bio *bio)
143 {
144 if (bio_has_data(bio))
145 return page_address(bio_page(bio)) + bio_offset(bio);
146
147 return NULL;
148 }
149
150 /*
151 * will die
152 */
153 #define bio_to_phys(bio) (page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio)))
154 #define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset)
155
156 /*
157 * queues that have highmem support enabled may still need to revert to
158 * PIO transfers occasionally and thus map high pages temporarily. For
159 * permanent PIO fall back, user is probably better off disabling highmem
160 * I/O completely on that queue (see ide-dma for example)
161 */
162 #define __bio_kmap_atomic(bio, iter) \
163 (kmap_atomic(bio_iter_iovec((bio), (iter)).bv_page) + \
164 bio_iter_iovec((bio), (iter)).bv_offset)
165
166 #define __bio_kunmap_atomic(addr) kunmap_atomic(addr)
167
168 /*
169 * merge helpers etc
170 */
171
172 /* Default implementation of BIOVEC_PHYS_MERGEABLE */
173 #define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
174 ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
175
176 /*
177 * allow arch override, for eg virtualized architectures (put in asm/io.h)
178 */
179 #ifndef BIOVEC_PHYS_MERGEABLE
180 #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
181 __BIOVEC_PHYS_MERGEABLE(vec1, vec2)
182 #endif
183
184 #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \
185 (((addr1) | (mask)) == (((addr2) - 1) | (mask)))
186 #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \
187 __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q)))
188
189 #define bio_io_error(bio) bio_endio((bio), -EIO)
190
191 /*
192 * drivers should _never_ use the all version - the bio may have been split
193 * before it got to the driver and the driver won't own all of it
194 */
195 #define bio_for_each_segment_all(bvl, bio, i) \
196 for (i = 0, bvl = (bio)->bi_io_vec; i < (bio)->bi_vcnt; i++, bvl++)
197
198 static inline void bvec_iter_advance(struct bio_vec *bv, struct bvec_iter *iter,
199 unsigned bytes)
200 {
201 WARN_ONCE(bytes > iter->bi_size,
202 "Attempted to advance past end of bvec iter\n");
203
204 while (bytes) {
205 unsigned len = min(bytes, bvec_iter_len(bv, *iter));
206
207 bytes -= len;
208 iter->bi_size -= len;
209 iter->bi_bvec_done += len;
210
211 if (iter->bi_bvec_done == __bvec_iter_bvec(bv, *iter)->bv_len) {
212 iter->bi_bvec_done = 0;
213 iter->bi_idx++;
214 }
215 }
216 }
217
218 #define for_each_bvec(bvl, bio_vec, iter, start) \
219 for (iter = (start); \
220 (iter).bi_size && \
221 ((bvl = bvec_iter_bvec((bio_vec), (iter))), 1); \
222 bvec_iter_advance((bio_vec), &(iter), (bvl).bv_len))
223
224
225 static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter,
226 unsigned bytes)
227 {
228 iter->bi_sector += bytes >> 9;
229
230 if (bio->bi_rw & BIO_NO_ADVANCE_ITER_MASK)
231 iter->bi_size -= bytes;
232 else
233 bvec_iter_advance(bio->bi_io_vec, iter, bytes);
234 }
235
236 #define __bio_for_each_segment(bvl, bio, iter, start) \
237 for (iter = (start); \
238 (iter).bi_size && \
239 ((bvl = bio_iter_iovec((bio), (iter))), 1); \
240 bio_advance_iter((bio), &(iter), (bvl).bv_len))
241
242 #define bio_for_each_segment(bvl, bio, iter) \
243 __bio_for_each_segment(bvl, bio, iter, (bio)->bi_iter)
244
245 #define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len)
246
247 static inline unsigned bio_segments(struct bio *bio)
248 {
249 unsigned segs = 0;
250 struct bio_vec bv;
251 struct bvec_iter iter;
252
253 /*
254 * We special case discard/write same, because they interpret bi_size
255 * differently:
256 */
257
258 if (bio->bi_rw & REQ_DISCARD)
259 return 1;
260
261 if (bio->bi_rw & REQ_WRITE_SAME)
262 return 1;
263
264 bio_for_each_segment(bv, bio, iter)
265 segs++;
266
267 return segs;
268 }
269
270 /*
271 * get a reference to a bio, so it won't disappear. the intended use is
272 * something like:
273 *
274 * bio_get(bio);
275 * submit_bio(rw, bio);
276 * if (bio->bi_flags ...)
277 * do_something
278 * bio_put(bio);
279 *
280 * without the bio_get(), it could potentially complete I/O before submit_bio
281 * returns. and then bio would be freed memory when if (bio->bi_flags ...)
282 * runs
283 */
284 #define bio_get(bio) atomic_inc(&(bio)->bi_cnt)
285
286 #if defined(CONFIG_BLK_DEV_INTEGRITY)
287 /*
288 * bio integrity payload
289 */
290 struct bio_integrity_payload {
291 struct bio *bip_bio; /* parent bio */
292
293 struct bvec_iter bip_iter;
294
295 /* kill - should just use bip_vec */
296 void *bip_buf; /* generated integrity data */
297
298 bio_end_io_t *bip_end_io; /* saved I/O completion fn */
299
300 unsigned short bip_slab; /* slab the bip came from */
301 unsigned short bip_vcnt; /* # of integrity bio_vecs */
302 unsigned bip_owns_buf:1; /* should free bip_buf */
303
304 struct work_struct bip_work; /* I/O completion */
305
306 struct bio_vec *bip_vec;
307 struct bio_vec bip_inline_vecs[0];/* embedded bvec array */
308 };
309 #endif /* CONFIG_BLK_DEV_INTEGRITY */
310
311 extern void bio_trim(struct bio *bio, int offset, int size);
312 extern struct bio *bio_split(struct bio *bio, int sectors,
313 gfp_t gfp, struct bio_set *bs);
314
315 /**
316 * bio_next_split - get next @sectors from a bio, splitting if necessary
317 * @bio: bio to split
318 * @sectors: number of sectors to split from the front of @bio
319 * @gfp: gfp mask
320 * @bs: bio set to allocate from
321 *
322 * Returns a bio representing the next @sectors of @bio - if the bio is smaller
323 * than @sectors, returns the original bio unchanged.
324 */
325 static inline struct bio *bio_next_split(struct bio *bio, int sectors,
326 gfp_t gfp, struct bio_set *bs)
327 {
328 if (sectors >= bio_sectors(bio))
329 return bio;
330
331 return bio_split(bio, sectors, gfp, bs);
332 }
333
334 extern struct bio_set *bioset_create(unsigned int, unsigned int);
335 extern void bioset_free(struct bio_set *);
336 extern mempool_t *biovec_create_pool(int pool_entries);
337
338 extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *);
339 extern void bio_put(struct bio *);
340
341 extern void __bio_clone_fast(struct bio *, struct bio *);
342 extern struct bio *bio_clone_fast(struct bio *, gfp_t, struct bio_set *);
343 extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs);
344
345 extern struct bio_set *fs_bio_set;
346 unsigned int bio_integrity_tag_size(struct bio *bio);
347
348 static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs)
349 {
350 return bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set);
351 }
352
353 static inline struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask)
354 {
355 return bio_clone_bioset(bio, gfp_mask, fs_bio_set);
356 }
357
358 static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs)
359 {
360 return bio_alloc_bioset(gfp_mask, nr_iovecs, NULL);
361 }
362
363 static inline struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask)
364 {
365 return bio_clone_bioset(bio, gfp_mask, NULL);
366
367 }
368
369 extern void bio_endio(struct bio *, int);
370 extern void bio_endio_nodec(struct bio *, int);
371 struct request_queue;
372 extern int bio_phys_segments(struct request_queue *, struct bio *);
373
374 extern int submit_bio_wait(int rw, struct bio *bio);
375 extern void bio_advance(struct bio *, unsigned);
376
377 extern void bio_init(struct bio *);
378 extern void bio_reset(struct bio *);
379 void bio_chain(struct bio *, struct bio *);
380
381 extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int);
382 extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *,
383 unsigned int, unsigned int);
384 extern int bio_get_nr_vecs(struct block_device *);
385 extern struct bio *bio_map_user(struct request_queue *, struct block_device *,
386 unsigned long, unsigned int, int, gfp_t);
387 struct sg_iovec;
388 struct rq_map_data;
389 extern struct bio *bio_map_user_iov(struct request_queue *,
390 struct block_device *,
391 const struct sg_iovec *, int, int, gfp_t);
392 extern void bio_unmap_user(struct bio *);
393 extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int,
394 gfp_t);
395 extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int,
396 gfp_t, int);
397 extern void bio_set_pages_dirty(struct bio *bio);
398 extern void bio_check_pages_dirty(struct bio *bio);
399
400 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
401 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
402 #endif
403 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
404 extern void bio_flush_dcache_pages(struct bio *bi);
405 #else
406 static inline void bio_flush_dcache_pages(struct bio *bi)
407 {
408 }
409 #endif
410
411 extern void bio_copy_data(struct bio *dst, struct bio *src);
412 extern int bio_alloc_pages(struct bio *bio, gfp_t gfp);
413
414 extern struct bio *bio_copy_user(struct request_queue *, struct rq_map_data *,
415 unsigned long, unsigned int, int, gfp_t);
416 extern struct bio *bio_copy_user_iov(struct request_queue *,
417 struct rq_map_data *,
418 const struct sg_iovec *,
419 int, int, gfp_t);
420 extern int bio_uncopy_user(struct bio *);
421 void zero_fill_bio(struct bio *bio);
422 extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *);
423 extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int);
424 extern unsigned int bvec_nr_vecs(unsigned short idx);
425
426 #ifdef CONFIG_BLK_CGROUP
427 int bio_associate_current(struct bio *bio);
428 void bio_disassociate_task(struct bio *bio);
429 #else /* CONFIG_BLK_CGROUP */
430 static inline int bio_associate_current(struct bio *bio) { return -ENOENT; }
431 static inline void bio_disassociate_task(struct bio *bio) { }
432 #endif /* CONFIG_BLK_CGROUP */
433
434 #ifdef CONFIG_HIGHMEM
435 /*
436 * remember never ever reenable interrupts between a bvec_kmap_irq and
437 * bvec_kunmap_irq!
438 */
439 static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags)
440 {
441 unsigned long addr;
442
443 /*
444 * might not be a highmem page, but the preempt/irq count
445 * balancing is a lot nicer this way
446 */
447 local_irq_save(*flags);
448 addr = (unsigned long) kmap_atomic(bvec->bv_page);
449
450 BUG_ON(addr & ~PAGE_MASK);
451
452 return (char *) addr + bvec->bv_offset;
453 }
454
455 static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags)
456 {
457 unsigned long ptr = (unsigned long) buffer & PAGE_MASK;
458
459 kunmap_atomic((void *) ptr);
460 local_irq_restore(*flags);
461 }
462
463 #else
464 static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags)
465 {
466 return page_address(bvec->bv_page) + bvec->bv_offset;
467 }
468
469 static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags)
470 {
471 *flags = 0;
472 }
473 #endif
474
475 static inline char *__bio_kmap_irq(struct bio *bio, struct bvec_iter iter,
476 unsigned long *flags)
477 {
478 return bvec_kmap_irq(&bio_iter_iovec(bio, iter), flags);
479 }
480 #define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags)
481
482 #define bio_kmap_irq(bio, flags) \
483 __bio_kmap_irq((bio), (bio)->bi_iter, (flags))
484 #define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags)
485
486 /*
487 * BIO list management for use by remapping drivers (e.g. DM or MD) and loop.
488 *
489 * A bio_list anchors a singly-linked list of bios chained through the bi_next
490 * member of the bio. The bio_list also caches the last list member to allow
491 * fast access to the tail.
492 */
493 struct bio_list {
494 struct bio *head;
495 struct bio *tail;
496 };
497
498 static inline int bio_list_empty(const struct bio_list *bl)
499 {
500 return bl->head == NULL;
501 }
502
503 static inline void bio_list_init(struct bio_list *bl)
504 {
505 bl->head = bl->tail = NULL;
506 }
507
508 #define BIO_EMPTY_LIST { NULL, NULL }
509
510 #define bio_list_for_each(bio, bl) \
511 for (bio = (bl)->head; bio; bio = bio->bi_next)
512
513 static inline unsigned bio_list_size(const struct bio_list *bl)
514 {
515 unsigned sz = 0;
516 struct bio *bio;
517
518 bio_list_for_each(bio, bl)
519 sz++;
520
521 return sz;
522 }
523
524 static inline void bio_list_add(struct bio_list *bl, struct bio *bio)
525 {
526 bio->bi_next = NULL;
527
528 if (bl->tail)
529 bl->tail->bi_next = bio;
530 else
531 bl->head = bio;
532
533 bl->tail = bio;
534 }
535
536 static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio)
537 {
538 bio->bi_next = bl->head;
539
540 bl->head = bio;
541
542 if (!bl->tail)
543 bl->tail = bio;
544 }
545
546 static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2)
547 {
548 if (!bl2->head)
549 return;
550
551 if (bl->tail)
552 bl->tail->bi_next = bl2->head;
553 else
554 bl->head = bl2->head;
555
556 bl->tail = bl2->tail;
557 }
558
559 static inline void bio_list_merge_head(struct bio_list *bl,
560 struct bio_list *bl2)
561 {
562 if (!bl2->head)
563 return;
564
565 if (bl->head)
566 bl2->tail->bi_next = bl->head;
567 else
568 bl->tail = bl2->tail;
569
570 bl->head = bl2->head;
571 }
572
573 static inline struct bio *bio_list_peek(struct bio_list *bl)
574 {
575 return bl->head;
576 }
577
578 static inline struct bio *bio_list_pop(struct bio_list *bl)
579 {
580 struct bio *bio = bl->head;
581
582 if (bio) {
583 bl->head = bl->head->bi_next;
584 if (!bl->head)
585 bl->tail = NULL;
586
587 bio->bi_next = NULL;
588 }
589
590 return bio;
591 }
592
593 static inline struct bio *bio_list_get(struct bio_list *bl)
594 {
595 struct bio *bio = bl->head;
596
597 bl->head = bl->tail = NULL;
598
599 return bio;
600 }
601
602 /*
603 * bio_set is used to allow other portions of the IO system to
604 * allocate their own private memory pools for bio and iovec structures.
605 * These memory pools in turn all allocate from the bio_slab
606 * and the bvec_slabs[].
607 */
608 #define BIO_POOL_SIZE 2
609 #define BIOVEC_NR_POOLS 6
610 #define BIOVEC_MAX_IDX (BIOVEC_NR_POOLS - 1)
611
612 struct bio_set {
613 struct kmem_cache *bio_slab;
614 unsigned int front_pad;
615
616 mempool_t *bio_pool;
617 mempool_t *bvec_pool;
618 #if defined(CONFIG_BLK_DEV_INTEGRITY)
619 mempool_t *bio_integrity_pool;
620 mempool_t *bvec_integrity_pool;
621 #endif
622
623 /*
624 * Deadlock avoidance for stacking block drivers: see comments in
625 * bio_alloc_bioset() for details
626 */
627 spinlock_t rescue_lock;
628 struct bio_list rescue_list;
629 struct work_struct rescue_work;
630 struct workqueue_struct *rescue_workqueue;
631 };
632
633 struct biovec_slab {
634 int nr_vecs;
635 char *name;
636 struct kmem_cache *slab;
637 };
638
639 /*
640 * a small number of entries is fine, not going to be performance critical.
641 * basically we just need to survive
642 */
643 #define BIO_SPLIT_ENTRIES 2
644
645 #if defined(CONFIG_BLK_DEV_INTEGRITY)
646
647
648
649 #define bip_vec_idx(bip, idx) (&(bip->bip_vec[(idx)]))
650
651 #define bip_for_each_vec(bvl, bip, iter) \
652 for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter)
653
654 #define bio_for_each_integrity_vec(_bvl, _bio, _iter) \
655 for_each_bio(_bio) \
656 bip_for_each_vec(_bvl, _bio->bi_integrity, _iter)
657
658 #define bio_integrity(bio) (bio->bi_integrity != NULL)
659
660 extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int);
661 extern void bio_integrity_free(struct bio *);
662 extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int);
663 extern int bio_integrity_enabled(struct bio *bio);
664 extern int bio_integrity_set_tag(struct bio *, void *, unsigned int);
665 extern int bio_integrity_get_tag(struct bio *, void *, unsigned int);
666 extern int bio_integrity_prep(struct bio *);
667 extern void bio_integrity_endio(struct bio *, int);
668 extern void bio_integrity_advance(struct bio *, unsigned int);
669 extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int);
670 extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t);
671 extern int bioset_integrity_create(struct bio_set *, int);
672 extern void bioset_integrity_free(struct bio_set *);
673 extern void bio_integrity_init(void);
674
675 #else /* CONFIG_BLK_DEV_INTEGRITY */
676
677 static inline int bio_integrity(struct bio *bio)
678 {
679 return 0;
680 }
681
682 static inline int bio_integrity_enabled(struct bio *bio)
683 {
684 return 0;
685 }
686
687 static inline int bioset_integrity_create(struct bio_set *bs, int pool_size)
688 {
689 return 0;
690 }
691
692 static inline void bioset_integrity_free (struct bio_set *bs)
693 {
694 return;
695 }
696
697 static inline int bio_integrity_prep(struct bio *bio)
698 {
699 return 0;
700 }
701
702 static inline void bio_integrity_free(struct bio *bio)
703 {
704 return;
705 }
706
707 static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src,
708 gfp_t gfp_mask)
709 {
710 return 0;
711 }
712
713 static inline void bio_integrity_advance(struct bio *bio,
714 unsigned int bytes_done)
715 {
716 return;
717 }
718
719 static inline void bio_integrity_trim(struct bio *bio, unsigned int offset,
720 unsigned int sectors)
721 {
722 return;
723 }
724
725 static inline void bio_integrity_init(void)
726 {
727 return;
728 }
729
730 #endif /* CONFIG_BLK_DEV_INTEGRITY */
731
732 #endif /* CONFIG_BLOCK */
733 #endif /* __LINUX_BIO_H */