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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>
26 #include <linux/bug.h>
32 /* struct bio, bio_vec and BIO_* flags are defined in blk_types.h */
33 #include <linux/blk_types.h>
38 #define BIO_BUG_ON BUG_ON
43 #define BIO_MAX_PAGES 256
44 #define BIO_MAX_SIZE (BIO_MAX_PAGES << PAGE_SHIFT)
45 #define BIO_MAX_SECTORS (BIO_MAX_SIZE >> 9)
48 * upper 16 bits of bi_rw define the io priority of this bio
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))
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); \
61 * various member access, note that bio_data should of course not be used
62 * on highmem page vectors
64 #define __bvec_iter_bvec(bvec, iter) (&(bvec)[(iter).bi_idx])
66 #define bvec_iter_page(bvec, iter) \
67 (__bvec_iter_bvec((bvec), (iter))->bv_page)
69 #define bvec_iter_len(bvec, iter) \
71 __bvec_iter_bvec((bvec), (iter))->bv_len - (iter).bi_bvec_done)
73 #define bvec_iter_offset(bvec, iter) \
74 (__bvec_iter_bvec((bvec), (iter))->bv_offset + (iter).bi_bvec_done)
76 #define bvec_iter_bvec(bvec, iter) \
78 .bv_page = bvec_iter_page((bvec), (iter)), \
79 .bv_len = bvec_iter_len((bvec), (iter)), \
80 .bv_offset = bvec_iter_offset((bvec), (iter)), \
83 #define bio_iter_iovec(bio, iter) \
84 bvec_iter_bvec((bio)->bi_io_vec, (iter))
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))
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)
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)))
103 * Check whether this bio carries any data or not. A NULL bio is allowed.
105 static inline bool bio_has_data(struct bio
*bio
)
108 bio
->bi_iter
.bi_size
&&
109 !(bio
->bi_rw
& REQ_DISCARD
))
115 static inline bool bio_is_rw(struct bio
*bio
)
117 if (!bio_has_data(bio
))
120 if (bio
->bi_rw
& BIO_NO_ADVANCE_ITER_MASK
)
126 static inline bool bio_mergeable(struct bio
*bio
)
128 if (bio
->bi_rw
& REQ_NOMERGE_FLAGS
)
134 static inline unsigned int bio_cur_bytes(struct bio
*bio
)
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
;
142 static inline void *bio_data(struct bio
*bio
)
144 if (bio_has_data(bio
))
145 return page_address(bio_page(bio
)) + bio_offset(bio
);
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)
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)
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)
166 #define __bio_kunmap_atomic(addr) kunmap_atomic(addr)
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)))
177 * allow arch override, for eg virtualized architectures (put in asm/io.h)
179 #ifndef BIOVEC_PHYS_MERGEABLE
180 #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
181 __BIOVEC_PHYS_MERGEABLE(vec1, vec2)
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)))
190 * drivers should _never_ use the all version - the bio may have been split
191 * before it got to the driver and the driver won't own all of it
193 #define bio_for_each_segment_all(bvl, bio, i) \
194 for (i = 0, bvl = (bio)->bi_io_vec; i < (bio)->bi_vcnt; i++, bvl++)
196 static inline void bvec_iter_advance(struct bio_vec
*bv
, struct bvec_iter
*iter
,
199 WARN_ONCE(bytes
> iter
->bi_size
,
200 "Attempted to advance past end of bvec iter\n");
203 unsigned len
= min(bytes
, bvec_iter_len(bv
, *iter
));
206 iter
->bi_size
-= len
;
207 iter
->bi_bvec_done
+= len
;
209 if (iter
->bi_bvec_done
== __bvec_iter_bvec(bv
, *iter
)->bv_len
) {
210 iter
->bi_bvec_done
= 0;
216 #define for_each_bvec(bvl, bio_vec, iter, start) \
217 for (iter = (start); \
219 ((bvl = bvec_iter_bvec((bio_vec), (iter))), 1); \
220 bvec_iter_advance((bio_vec), &(iter), (bvl).bv_len))
223 static inline void bio_advance_iter(struct bio
*bio
, struct bvec_iter
*iter
,
226 iter
->bi_sector
+= bytes
>> 9;
228 if (bio
->bi_rw
& BIO_NO_ADVANCE_ITER_MASK
)
229 iter
->bi_size
-= bytes
;
231 bvec_iter_advance(bio
->bi_io_vec
, iter
, bytes
);
234 #define __bio_for_each_segment(bvl, bio, iter, start) \
235 for (iter = (start); \
237 ((bvl = bio_iter_iovec((bio), (iter))), 1); \
238 bio_advance_iter((bio), &(iter), (bvl).bv_len))
240 #define bio_for_each_segment(bvl, bio, iter) \
241 __bio_for_each_segment(bvl, bio, iter, (bio)->bi_iter)
243 #define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len)
245 static inline unsigned bio_segments(struct bio
*bio
)
249 struct bvec_iter iter
;
252 * We special case discard/write same, because they interpret bi_size
256 if (bio
->bi_rw
& REQ_DISCARD
)
259 if (bio
->bi_rw
& REQ_WRITE_SAME
)
262 bio_for_each_segment(bv
, bio
, iter
)
269 * get a reference to a bio, so it won't disappear. the intended use is
273 * submit_bio(rw, bio);
274 * if (bio->bi_flags ...)
278 * without the bio_get(), it could potentially complete I/O before submit_bio
279 * returns. and then bio would be freed memory when if (bio->bi_flags ...)
282 static inline void bio_get(struct bio
*bio
)
284 bio
->bi_flags
|= (1 << BIO_REFFED
);
285 smp_mb__before_atomic();
286 atomic_inc(&bio
->__bi_cnt
);
289 static inline void bio_cnt_set(struct bio
*bio
, unsigned int count
)
292 bio
->bi_flags
|= (1 << BIO_REFFED
);
293 smp_mb__before_atomic();
295 atomic_set(&bio
->__bi_cnt
, count
);
298 static inline bool bio_flagged(struct bio
*bio
, unsigned int bit
)
300 return (bio
->bi_flags
& (1U << bit
)) != 0;
303 static inline void bio_set_flag(struct bio
*bio
, unsigned int bit
)
305 bio
->bi_flags
|= (1U << bit
);
308 static inline void bio_clear_flag(struct bio
*bio
, unsigned int bit
)
310 bio
->bi_flags
&= ~(1U << bit
);
313 static inline void bio_get_first_bvec(struct bio
*bio
, struct bio_vec
*bv
)
315 *bv
= bio_iovec(bio
);
318 static inline void bio_get_last_bvec(struct bio
*bio
, struct bio_vec
*bv
)
320 struct bvec_iter iter
= bio
->bi_iter
;
323 if (unlikely(!bio_multiple_segments(bio
))) {
324 *bv
= bio_iovec(bio
);
328 bio_advance_iter(bio
, &iter
, iter
.bi_size
);
330 if (!iter
.bi_bvec_done
)
331 idx
= iter
.bi_idx
- 1;
332 else /* in the middle of bvec */
335 *bv
= bio
->bi_io_vec
[idx
];
338 * iter.bi_bvec_done records actual length of the last bvec
339 * if this bio ends in the middle of one io vector
341 if (iter
.bi_bvec_done
)
342 bv
->bv_len
= iter
.bi_bvec_done
;
346 BIP_BLOCK_INTEGRITY
= 1 << 0, /* block layer owns integrity data */
347 BIP_MAPPED_INTEGRITY
= 1 << 1, /* ref tag has been remapped */
348 BIP_CTRL_NOCHECK
= 1 << 2, /* disable HBA integrity checking */
349 BIP_DISK_NOCHECK
= 1 << 3, /* disable disk integrity checking */
350 BIP_IP_CHECKSUM
= 1 << 4, /* IP checksum */
354 * bio integrity payload
356 struct bio_integrity_payload
{
357 struct bio
*bip_bio
; /* parent bio */
359 struct bvec_iter bip_iter
;
361 bio_end_io_t
*bip_end_io
; /* saved I/O completion fn */
363 unsigned short bip_slab
; /* slab the bip came from */
364 unsigned short bip_vcnt
; /* # of integrity bio_vecs */
365 unsigned short bip_max_vcnt
; /* integrity bio_vec slots */
366 unsigned short bip_flags
; /* control flags */
368 struct work_struct bip_work
; /* I/O completion */
370 struct bio_vec
*bip_vec
;
371 struct bio_vec bip_inline_vecs
[0];/* embedded bvec array */
374 #if defined(CONFIG_BLK_DEV_INTEGRITY)
376 static inline struct bio_integrity_payload
*bio_integrity(struct bio
*bio
)
378 if (bio
->bi_rw
& REQ_INTEGRITY
)
379 return bio
->bi_integrity
;
384 static inline bool bio_integrity_flagged(struct bio
*bio
, enum bip_flags flag
)
386 struct bio_integrity_payload
*bip
= bio_integrity(bio
);
389 return bip
->bip_flags
& flag
;
394 static inline sector_t
bip_get_seed(struct bio_integrity_payload
*bip
)
396 return bip
->bip_iter
.bi_sector
;
399 static inline void bip_set_seed(struct bio_integrity_payload
*bip
,
402 bip
->bip_iter
.bi_sector
= seed
;
405 #endif /* CONFIG_BLK_DEV_INTEGRITY */
407 extern void bio_trim(struct bio
*bio
, int offset
, int size
);
408 extern struct bio
*bio_split(struct bio
*bio
, int sectors
,
409 gfp_t gfp
, struct bio_set
*bs
);
412 * bio_next_split - get next @sectors from a bio, splitting if necessary
414 * @sectors: number of sectors to split from the front of @bio
416 * @bs: bio set to allocate from
418 * Returns a bio representing the next @sectors of @bio - if the bio is smaller
419 * than @sectors, returns the original bio unchanged.
421 static inline struct bio
*bio_next_split(struct bio
*bio
, int sectors
,
422 gfp_t gfp
, struct bio_set
*bs
)
424 if (sectors
>= bio_sectors(bio
))
427 return bio_split(bio
, sectors
, gfp
, bs
);
430 extern struct bio_set
*bioset_create(unsigned int, unsigned int);
431 extern struct bio_set
*bioset_create_nobvec(unsigned int, unsigned int);
432 extern void bioset_free(struct bio_set
*);
433 extern mempool_t
*biovec_create_pool(int pool_entries
);
435 extern struct bio
*bio_alloc_bioset(gfp_t
, int, struct bio_set
*);
436 extern void bio_put(struct bio
*);
438 extern void __bio_clone_fast(struct bio
*, struct bio
*);
439 extern struct bio
*bio_clone_fast(struct bio
*, gfp_t
, struct bio_set
*);
440 extern struct bio
*bio_clone_bioset(struct bio
*, gfp_t
, struct bio_set
*bs
);
442 extern struct bio_set
*fs_bio_set
;
444 static inline struct bio
*bio_alloc(gfp_t gfp_mask
, unsigned int nr_iovecs
)
446 return bio_alloc_bioset(gfp_mask
, nr_iovecs
, fs_bio_set
);
449 static inline struct bio
*bio_clone(struct bio
*bio
, gfp_t gfp_mask
)
451 return bio_clone_bioset(bio
, gfp_mask
, fs_bio_set
);
454 static inline struct bio
*bio_kmalloc(gfp_t gfp_mask
, unsigned int nr_iovecs
)
456 return bio_alloc_bioset(gfp_mask
, nr_iovecs
, NULL
);
459 static inline struct bio
*bio_clone_kmalloc(struct bio
*bio
, gfp_t gfp_mask
)
461 return bio_clone_bioset(bio
, gfp_mask
, NULL
);
465 extern void bio_endio(struct bio
*);
467 static inline void bio_io_error(struct bio
*bio
)
469 bio
->bi_error
= -EIO
;
473 struct request_queue
;
474 extern int bio_phys_segments(struct request_queue
*, struct bio
*);
476 extern int submit_bio_wait(int rw
, struct bio
*bio
);
477 extern void bio_advance(struct bio
*, unsigned);
479 extern void bio_init(struct bio
*);
480 extern void bio_reset(struct bio
*);
481 void bio_chain(struct bio
*, struct bio
*);
483 extern int bio_add_page(struct bio
*, struct page
*, unsigned int,unsigned int);
484 extern int bio_add_pc_page(struct request_queue
*, struct bio
*, struct page
*,
485 unsigned int, unsigned int);
487 extern struct bio
*bio_map_user_iov(struct request_queue
*,
488 const struct iov_iter
*, gfp_t
);
489 extern void bio_unmap_user(struct bio
*);
490 extern struct bio
*bio_map_kern(struct request_queue
*, void *, unsigned int,
492 extern struct bio
*bio_copy_kern(struct request_queue
*, void *, unsigned int,
494 extern void bio_set_pages_dirty(struct bio
*bio
);
495 extern void bio_check_pages_dirty(struct bio
*bio
);
497 void generic_start_io_acct(int rw
, unsigned long sectors
,
498 struct hd_struct
*part
);
499 void generic_end_io_acct(int rw
, struct hd_struct
*part
,
500 unsigned long start_time
);
502 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
503 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
505 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
506 extern void bio_flush_dcache_pages(struct bio
*bi
);
508 static inline void bio_flush_dcache_pages(struct bio
*bi
)
513 extern void bio_copy_data(struct bio
*dst
, struct bio
*src
);
514 extern int bio_alloc_pages(struct bio
*bio
, gfp_t gfp
);
516 extern struct bio
*bio_copy_user_iov(struct request_queue
*,
517 struct rq_map_data
*,
518 const struct iov_iter
*,
520 extern int bio_uncopy_user(struct bio
*);
521 void zero_fill_bio(struct bio
*bio
);
522 extern struct bio_vec
*bvec_alloc(gfp_t
, int, unsigned long *, mempool_t
*);
523 extern void bvec_free(mempool_t
*, struct bio_vec
*, unsigned int);
524 extern unsigned int bvec_nr_vecs(unsigned short idx
);
526 #ifdef CONFIG_BLK_CGROUP
527 int bio_associate_blkcg(struct bio
*bio
, struct cgroup_subsys_state
*blkcg_css
);
528 int bio_associate_current(struct bio
*bio
);
529 void bio_disassociate_task(struct bio
*bio
);
530 #else /* CONFIG_BLK_CGROUP */
531 static inline int bio_associate_blkcg(struct bio
*bio
,
532 struct cgroup_subsys_state
*blkcg_css
) { return 0; }
533 static inline int bio_associate_current(struct bio
*bio
) { return -ENOENT
; }
534 static inline void bio_disassociate_task(struct bio
*bio
) { }
535 #endif /* CONFIG_BLK_CGROUP */
537 #ifdef CONFIG_HIGHMEM
539 * remember never ever reenable interrupts between a bvec_kmap_irq and
542 static inline char *bvec_kmap_irq(struct bio_vec
*bvec
, unsigned long *flags
)
547 * might not be a highmem page, but the preempt/irq count
548 * balancing is a lot nicer this way
550 local_irq_save(*flags
);
551 addr
= (unsigned long) kmap_atomic(bvec
->bv_page
);
553 BUG_ON(addr
& ~PAGE_MASK
);
555 return (char *) addr
+ bvec
->bv_offset
;
558 static inline void bvec_kunmap_irq(char *buffer
, unsigned long *flags
)
560 unsigned long ptr
= (unsigned long) buffer
& PAGE_MASK
;
562 kunmap_atomic((void *) ptr
);
563 local_irq_restore(*flags
);
567 static inline char *bvec_kmap_irq(struct bio_vec
*bvec
, unsigned long *flags
)
569 return page_address(bvec
->bv_page
) + bvec
->bv_offset
;
572 static inline void bvec_kunmap_irq(char *buffer
, unsigned long *flags
)
578 static inline char *__bio_kmap_irq(struct bio
*bio
, struct bvec_iter iter
,
579 unsigned long *flags
)
581 return bvec_kmap_irq(&bio_iter_iovec(bio
, iter
), flags
);
583 #define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags)
585 #define bio_kmap_irq(bio, flags) \
586 __bio_kmap_irq((bio), (bio)->bi_iter, (flags))
587 #define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags)
590 * BIO list management for use by remapping drivers (e.g. DM or MD) and loop.
592 * A bio_list anchors a singly-linked list of bios chained through the bi_next
593 * member of the bio. The bio_list also caches the last list member to allow
594 * fast access to the tail.
601 static inline int bio_list_empty(const struct bio_list
*bl
)
603 return bl
->head
== NULL
;
606 static inline void bio_list_init(struct bio_list
*bl
)
608 bl
->head
= bl
->tail
= NULL
;
611 #define BIO_EMPTY_LIST { NULL, NULL }
613 #define bio_list_for_each(bio, bl) \
614 for (bio = (bl)->head; bio; bio = bio->bi_next)
616 static inline unsigned bio_list_size(const struct bio_list
*bl
)
621 bio_list_for_each(bio
, bl
)
627 static inline void bio_list_add(struct bio_list
*bl
, struct bio
*bio
)
632 bl
->tail
->bi_next
= bio
;
639 static inline void bio_list_add_head(struct bio_list
*bl
, struct bio
*bio
)
641 bio
->bi_next
= bl
->head
;
649 static inline void bio_list_merge(struct bio_list
*bl
, struct bio_list
*bl2
)
655 bl
->tail
->bi_next
= bl2
->head
;
657 bl
->head
= bl2
->head
;
659 bl
->tail
= bl2
->tail
;
662 static inline void bio_list_merge_head(struct bio_list
*bl
,
663 struct bio_list
*bl2
)
669 bl2
->tail
->bi_next
= bl
->head
;
671 bl
->tail
= bl2
->tail
;
673 bl
->head
= bl2
->head
;
676 static inline struct bio
*bio_list_peek(struct bio_list
*bl
)
681 static inline struct bio
*bio_list_pop(struct bio_list
*bl
)
683 struct bio
*bio
= bl
->head
;
686 bl
->head
= bl
->head
->bi_next
;
696 static inline struct bio
*bio_list_get(struct bio_list
*bl
)
698 struct bio
*bio
= bl
->head
;
700 bl
->head
= bl
->tail
= NULL
;
706 * Increment chain count for the bio. Make sure the CHAIN flag update
707 * is visible before the raised count.
709 static inline void bio_inc_remaining(struct bio
*bio
)
711 bio_set_flag(bio
, BIO_CHAIN
);
712 smp_mb__before_atomic();
713 atomic_inc(&bio
->__bi_remaining
);
717 * bio_set is used to allow other portions of the IO system to
718 * allocate their own private memory pools for bio and iovec structures.
719 * These memory pools in turn all allocate from the bio_slab
720 * and the bvec_slabs[].
722 #define BIO_POOL_SIZE 2
723 #define BIOVEC_NR_POOLS 6
724 #define BIOVEC_MAX_IDX (BIOVEC_NR_POOLS - 1)
727 struct kmem_cache
*bio_slab
;
728 unsigned int front_pad
;
731 mempool_t
*bvec_pool
;
732 #if defined(CONFIG_BLK_DEV_INTEGRITY)
733 mempool_t
*bio_integrity_pool
;
734 mempool_t
*bvec_integrity_pool
;
738 * Deadlock avoidance for stacking block drivers: see comments in
739 * bio_alloc_bioset() for details
741 spinlock_t rescue_lock
;
742 struct bio_list rescue_list
;
743 struct work_struct rescue_work
;
744 struct workqueue_struct
*rescue_workqueue
;
750 struct kmem_cache
*slab
;
754 * a small number of entries is fine, not going to be performance critical.
755 * basically we just need to survive
757 #define BIO_SPLIT_ENTRIES 2
759 #if defined(CONFIG_BLK_DEV_INTEGRITY)
761 #define bip_for_each_vec(bvl, bip, iter) \
762 for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter)
764 #define bio_for_each_integrity_vec(_bvl, _bio, _iter) \
766 bip_for_each_vec(_bvl, _bio->bi_integrity, _iter)
768 extern struct bio_integrity_payload
*bio_integrity_alloc(struct bio
*, gfp_t
, unsigned int);
769 extern void bio_integrity_free(struct bio
*);
770 extern int bio_integrity_add_page(struct bio
*, struct page
*, unsigned int, unsigned int);
771 extern bool bio_integrity_enabled(struct bio
*bio
);
772 extern int bio_integrity_prep(struct bio
*);
773 extern void bio_integrity_endio(struct bio
*);
774 extern void bio_integrity_advance(struct bio
*, unsigned int);
775 extern void bio_integrity_trim(struct bio
*, unsigned int, unsigned int);
776 extern int bio_integrity_clone(struct bio
*, struct bio
*, gfp_t
);
777 extern int bioset_integrity_create(struct bio_set
*, int);
778 extern void bioset_integrity_free(struct bio_set
*);
779 extern void bio_integrity_init(void);
781 #else /* CONFIG_BLK_DEV_INTEGRITY */
783 static inline void *bio_integrity(struct bio
*bio
)
788 static inline bool bio_integrity_enabled(struct bio
*bio
)
793 static inline int bioset_integrity_create(struct bio_set
*bs
, int pool_size
)
798 static inline void bioset_integrity_free (struct bio_set
*bs
)
803 static inline int bio_integrity_prep(struct bio
*bio
)
808 static inline void bio_integrity_free(struct bio
*bio
)
813 static inline int bio_integrity_clone(struct bio
*bio
, struct bio
*bio_src
,
819 static inline void bio_integrity_advance(struct bio
*bio
,
820 unsigned int bytes_done
)
825 static inline void bio_integrity_trim(struct bio
*bio
, unsigned int offset
,
826 unsigned int sectors
)
831 static inline void bio_integrity_init(void)
836 static inline bool bio_integrity_flagged(struct bio
*bio
, enum bip_flags flag
)
841 static inline void *bio_integrity_alloc(struct bio
* bio
, gfp_t gfp
,
844 return ERR_PTR(-EINVAL
);
847 static inline int bio_integrity_add_page(struct bio
*bio
, struct page
*page
,
848 unsigned int len
, unsigned int offset
)
853 #endif /* CONFIG_BLK_DEV_INTEGRITY */
855 #endif /* CONFIG_BLOCK */
856 #endif /* __LINUX_BIO_H */