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2 * Copyright (C) 2001 Jens Axboe <axboe@suse.de>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public Licens
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-
21 #include <linux/highmem.h>
22 #include <linux/mempool.h>
23 #include <linux/ioprio.h>
24 #include <linux/bug.h>
30 /* struct bio, bio_vec and BIO_* flags are defined in blk_types.h */
31 #include <linux/blk_types.h>
36 #define BIO_BUG_ON BUG_ON
41 #ifdef CONFIG_THP_SWAP
42 #if HPAGE_PMD_NR > 256
43 #define BIO_MAX_PAGES HPAGE_PMD_NR
45 #define BIO_MAX_PAGES 256
48 #define BIO_MAX_PAGES 256
51 #define bio_prio(bio) (bio)->bi_ioprio
52 #define bio_set_prio(bio, prio) ((bio)->bi_ioprio = prio)
54 #define bio_iter_iovec(bio, iter) \
55 bvec_iter_bvec((bio)->bi_io_vec, (iter))
57 #define bio_iter_page(bio, iter) \
58 bvec_iter_page((bio)->bi_io_vec, (iter))
59 #define bio_iter_len(bio, iter) \
60 bvec_iter_len((bio)->bi_io_vec, (iter))
61 #define bio_iter_offset(bio, iter) \
62 bvec_iter_offset((bio)->bi_io_vec, (iter))
64 #define bio_page(bio) bio_iter_page((bio), (bio)->bi_iter)
65 #define bio_offset(bio) bio_iter_offset((bio), (bio)->bi_iter)
66 #define bio_iovec(bio) bio_iter_iovec((bio), (bio)->bi_iter)
68 #define bio_multiple_segments(bio) \
69 ((bio)->bi_iter.bi_size != bio_iovec(bio).bv_len)
70 #define bio_sectors(bio) ((bio)->bi_iter.bi_size >> 9)
71 #define bio_end_sector(bio) ((bio)->bi_iter.bi_sector + bio_sectors((bio)))
74 * Return the data direction, READ or WRITE.
76 #define bio_data_dir(bio) \
77 (op_is_write(bio_op(bio)) ? WRITE : READ)
80 * Check whether this bio carries any data or not. A NULL bio is allowed.
82 static inline bool bio_has_data(struct bio
*bio
)
85 bio
->bi_iter
.bi_size
&&
86 bio_op(bio
) != REQ_OP_DISCARD
&&
87 bio_op(bio
) != REQ_OP_SECURE_ERASE
&&
88 bio_op(bio
) != REQ_OP_WRITE_ZEROES
)
94 static inline bool bio_no_advance_iter(struct bio
*bio
)
96 return bio_op(bio
) == REQ_OP_DISCARD
||
97 bio_op(bio
) == REQ_OP_SECURE_ERASE
||
98 bio_op(bio
) == REQ_OP_WRITE_SAME
||
99 bio_op(bio
) == REQ_OP_WRITE_ZEROES
;
102 static inline bool bio_mergeable(struct bio
*bio
)
104 if (bio
->bi_opf
& REQ_NOMERGE_FLAGS
)
110 static inline unsigned int bio_cur_bytes(struct bio
*bio
)
112 if (bio_has_data(bio
))
113 return bio_iovec(bio
).bv_len
;
114 else /* dataless requests such as discard */
115 return bio
->bi_iter
.bi_size
;
118 static inline void *bio_data(struct bio
*bio
)
120 if (bio_has_data(bio
))
121 return page_address(bio_page(bio
)) + bio_offset(bio
);
126 static inline bool bio_full(struct bio
*bio
)
128 return bio
->bi_vcnt
>= bio
->bi_max_vecs
;
134 #define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset)
140 /* Default implementation of BIOVEC_PHYS_MERGEABLE */
141 #define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
142 ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
145 * allow arch override, for eg virtualized architectures (put in asm/io.h)
147 #ifndef BIOVEC_PHYS_MERGEABLE
148 #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
149 __BIOVEC_PHYS_MERGEABLE(vec1, vec2)
152 #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \
153 (((addr1) | (mask)) == (((addr2) - 1) | (mask)))
154 #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \
155 __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q)))
158 * drivers should _never_ use the all version - the bio may have been split
159 * before it got to the driver and the driver won't own all of it
161 #define bio_for_each_segment_all(bvl, bio, i) \
162 for (i = 0, bvl = (bio)->bi_io_vec; i < (bio)->bi_vcnt; i++, bvl++)
164 static inline void bio_advance_iter(struct bio
*bio
, struct bvec_iter
*iter
,
167 iter
->bi_sector
+= bytes
>> 9;
169 if (bio_no_advance_iter(bio
)) {
170 iter
->bi_size
-= bytes
;
171 iter
->bi_done
+= bytes
;
173 bvec_iter_advance(bio
->bi_io_vec
, iter
, bytes
);
174 /* TODO: It is reasonable to complete bio with error here. */
178 static inline bool bio_rewind_iter(struct bio
*bio
, struct bvec_iter
*iter
,
181 iter
->bi_sector
-= bytes
>> 9;
183 if (bio_no_advance_iter(bio
)) {
184 iter
->bi_size
+= bytes
;
185 iter
->bi_done
-= bytes
;
189 return bvec_iter_rewind(bio
->bi_io_vec
, iter
, bytes
);
192 #define __bio_for_each_segment(bvl, bio, iter, start) \
193 for (iter = (start); \
195 ((bvl = bio_iter_iovec((bio), (iter))), 1); \
196 bio_advance_iter((bio), &(iter), (bvl).bv_len))
198 #define bio_for_each_segment(bvl, bio, iter) \
199 __bio_for_each_segment(bvl, bio, iter, (bio)->bi_iter)
201 #define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len)
203 static inline unsigned bio_segments(struct bio
*bio
)
207 struct bvec_iter iter
;
210 * We special case discard/write same/write zeroes, because they
211 * interpret bi_size differently:
214 switch (bio_op(bio
)) {
216 case REQ_OP_SECURE_ERASE
:
217 case REQ_OP_WRITE_ZEROES
:
219 case REQ_OP_WRITE_SAME
:
225 bio_for_each_segment(bv
, bio
, iter
)
232 * get a reference to a bio, so it won't disappear. the intended use is
236 * submit_bio(rw, bio);
237 * if (bio->bi_flags ...)
241 * without the bio_get(), it could potentially complete I/O before submit_bio
242 * returns. and then bio would be freed memory when if (bio->bi_flags ...)
245 static inline void bio_get(struct bio
*bio
)
247 bio
->bi_flags
|= (1 << BIO_REFFED
);
248 smp_mb__before_atomic();
249 atomic_inc(&bio
->__bi_cnt
);
252 static inline void bio_cnt_set(struct bio
*bio
, unsigned int count
)
255 bio
->bi_flags
|= (1 << BIO_REFFED
);
258 atomic_set(&bio
->__bi_cnt
, count
);
261 static inline bool bio_flagged(struct bio
*bio
, unsigned int bit
)
263 return (bio
->bi_flags
& (1U << bit
)) != 0;
266 static inline void bio_set_flag(struct bio
*bio
, unsigned int bit
)
268 bio
->bi_flags
|= (1U << bit
);
271 static inline void bio_clear_flag(struct bio
*bio
, unsigned int bit
)
273 bio
->bi_flags
&= ~(1U << bit
);
276 static inline void bio_get_first_bvec(struct bio
*bio
, struct bio_vec
*bv
)
278 *bv
= bio_iovec(bio
);
281 static inline void bio_get_last_bvec(struct bio
*bio
, struct bio_vec
*bv
)
283 struct bvec_iter iter
= bio
->bi_iter
;
286 if (unlikely(!bio_multiple_segments(bio
))) {
287 *bv
= bio_iovec(bio
);
291 bio_advance_iter(bio
, &iter
, iter
.bi_size
);
293 if (!iter
.bi_bvec_done
)
294 idx
= iter
.bi_idx
- 1;
295 else /* in the middle of bvec */
298 *bv
= bio
->bi_io_vec
[idx
];
301 * iter.bi_bvec_done records actual length of the last bvec
302 * if this bio ends in the middle of one io vector
304 if (iter
.bi_bvec_done
)
305 bv
->bv_len
= iter
.bi_bvec_done
;
309 BIP_BLOCK_INTEGRITY
= 1 << 0, /* block layer owns integrity data */
310 BIP_MAPPED_INTEGRITY
= 1 << 1, /* ref tag has been remapped */
311 BIP_CTRL_NOCHECK
= 1 << 2, /* disable HBA integrity checking */
312 BIP_DISK_NOCHECK
= 1 << 3, /* disable disk integrity checking */
313 BIP_IP_CHECKSUM
= 1 << 4, /* IP checksum */
317 * bio integrity payload
319 struct bio_integrity_payload
{
320 struct bio
*bip_bio
; /* parent bio */
322 struct bvec_iter bip_iter
;
324 unsigned short bip_slab
; /* slab the bip came from */
325 unsigned short bip_vcnt
; /* # of integrity bio_vecs */
326 unsigned short bip_max_vcnt
; /* integrity bio_vec slots */
327 unsigned short bip_flags
; /* control flags */
329 struct work_struct bip_work
; /* I/O completion */
331 struct bio_vec
*bip_vec
;
332 struct bio_vec bip_inline_vecs
[0];/* embedded bvec array */
335 #if defined(CONFIG_BLK_DEV_INTEGRITY)
337 static inline struct bio_integrity_payload
*bio_integrity(struct bio
*bio
)
339 if (bio
->bi_opf
& REQ_INTEGRITY
)
340 return bio
->bi_integrity
;
345 static inline bool bio_integrity_flagged(struct bio
*bio
, enum bip_flags flag
)
347 struct bio_integrity_payload
*bip
= bio_integrity(bio
);
350 return bip
->bip_flags
& flag
;
355 static inline sector_t
bip_get_seed(struct bio_integrity_payload
*bip
)
357 return bip
->bip_iter
.bi_sector
;
360 static inline void bip_set_seed(struct bio_integrity_payload
*bip
,
363 bip
->bip_iter
.bi_sector
= seed
;
366 #endif /* CONFIG_BLK_DEV_INTEGRITY */
368 extern void bio_trim(struct bio
*bio
, int offset
, int size
);
369 extern struct bio
*bio_split(struct bio
*bio
, int sectors
,
370 gfp_t gfp
, struct bio_set
*bs
);
373 * bio_next_split - get next @sectors from a bio, splitting if necessary
375 * @sectors: number of sectors to split from the front of @bio
377 * @bs: bio set to allocate from
379 * Returns a bio representing the next @sectors of @bio - if the bio is smaller
380 * than @sectors, returns the original bio unchanged.
382 static inline struct bio
*bio_next_split(struct bio
*bio
, int sectors
,
383 gfp_t gfp
, struct bio_set
*bs
)
385 if (sectors
>= bio_sectors(bio
))
388 return bio_split(bio
, sectors
, gfp
, bs
);
391 extern struct bio_set
*bioset_create(unsigned int, unsigned int, int flags
);
393 BIOSET_NEED_BVECS
= BIT(0),
394 BIOSET_NEED_RESCUER
= BIT(1),
396 extern void bioset_free(struct bio_set
*);
397 extern mempool_t
*biovec_create_pool(int pool_entries
);
399 extern struct bio
*bio_alloc_bioset(gfp_t
, unsigned int, struct bio_set
*);
400 extern void bio_put(struct bio
*);
402 extern void __bio_clone_fast(struct bio
*, struct bio
*);
403 extern struct bio
*bio_clone_fast(struct bio
*, gfp_t
, struct bio_set
*);
404 extern struct bio
*bio_clone_bioset(struct bio
*, gfp_t
, struct bio_set
*bs
);
406 extern struct bio_set
*fs_bio_set
;
408 static inline struct bio
*bio_alloc(gfp_t gfp_mask
, unsigned int nr_iovecs
)
410 return bio_alloc_bioset(gfp_mask
, nr_iovecs
, fs_bio_set
);
413 static inline struct bio
*bio_kmalloc(gfp_t gfp_mask
, unsigned int nr_iovecs
)
415 return bio_alloc_bioset(gfp_mask
, nr_iovecs
, NULL
);
418 static inline struct bio
*bio_clone_kmalloc(struct bio
*bio
, gfp_t gfp_mask
)
420 return bio_clone_bioset(bio
, gfp_mask
, NULL
);
424 extern blk_qc_t
submit_bio(struct bio
*);
426 extern void bio_endio(struct bio
*);
428 static inline void bio_io_error(struct bio
*bio
)
430 bio
->bi_status
= BLK_STS_IOERR
;
434 static inline void bio_wouldblock_error(struct bio
*bio
)
436 bio
->bi_status
= BLK_STS_AGAIN
;
440 struct request_queue
;
441 extern int bio_phys_segments(struct request_queue
*, struct bio
*);
443 extern int submit_bio_wait(struct bio
*bio
);
444 extern void bio_advance(struct bio
*, unsigned);
446 extern void bio_init(struct bio
*bio
, struct bio_vec
*table
,
447 unsigned short max_vecs
);
448 extern void bio_uninit(struct bio
*);
449 extern void bio_reset(struct bio
*);
450 void bio_chain(struct bio
*, struct bio
*);
452 extern int bio_add_page(struct bio
*, struct page
*, unsigned int,unsigned int);
453 extern int bio_add_pc_page(struct request_queue
*, struct bio
*, struct page
*,
454 unsigned int, unsigned int);
455 bool __bio_try_merge_page(struct bio
*bio
, struct page
*page
,
456 unsigned int len
, unsigned int off
);
457 void __bio_add_page(struct bio
*bio
, struct page
*page
,
458 unsigned int len
, unsigned int off
);
459 int bio_iov_iter_get_pages(struct bio
*bio
, struct iov_iter
*iter
);
461 extern struct bio
*bio_map_user_iov(struct request_queue
*,
462 struct iov_iter
*, gfp_t
);
463 extern void bio_unmap_user(struct bio
*);
464 extern struct bio
*bio_map_kern(struct request_queue
*, void *, unsigned int,
466 extern struct bio
*bio_copy_kern(struct request_queue
*, void *, unsigned int,
468 extern void bio_set_pages_dirty(struct bio
*bio
);
469 extern void bio_check_pages_dirty(struct bio
*bio
);
471 void generic_start_io_acct(struct request_queue
*q
, int rw
,
472 unsigned long sectors
, struct hd_struct
*part
);
473 void generic_end_io_acct(struct request_queue
*q
, int rw
,
474 struct hd_struct
*part
,
475 unsigned long start_time
);
477 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
478 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
480 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
481 extern void bio_flush_dcache_pages(struct bio
*bi
);
483 static inline void bio_flush_dcache_pages(struct bio
*bi
)
488 extern void bio_copy_data(struct bio
*dst
, struct bio
*src
);
489 extern int bio_alloc_pages(struct bio
*bio
, gfp_t gfp
);
490 extern void bio_free_pages(struct bio
*bio
);
492 extern struct bio
*bio_copy_user_iov(struct request_queue
*,
493 struct rq_map_data
*,
496 extern int bio_uncopy_user(struct bio
*);
497 void zero_fill_bio(struct bio
*bio
);
498 extern struct bio_vec
*bvec_alloc(gfp_t
, int, unsigned long *, mempool_t
*);
499 extern void bvec_free(mempool_t
*, struct bio_vec
*, unsigned int);
500 extern unsigned int bvec_nr_vecs(unsigned short idx
);
501 extern const char *bio_devname(struct bio
*bio
, char *buffer
);
503 #define bio_set_dev(bio, bdev) \
505 if ((bio)->bi_disk != (bdev)->bd_disk) \
506 bio_clear_flag(bio, BIO_THROTTLED);\
507 (bio)->bi_disk = (bdev)->bd_disk; \
508 (bio)->bi_partno = (bdev)->bd_partno; \
511 #define bio_copy_dev(dst, src) \
513 (dst)->bi_disk = (src)->bi_disk; \
514 (dst)->bi_partno = (src)->bi_partno; \
517 #define bio_dev(bio) \
518 disk_devt((bio)->bi_disk)
520 #ifdef CONFIG_BLK_CGROUP
521 int bio_associate_blkcg(struct bio
*bio
, struct cgroup_subsys_state
*blkcg_css
);
522 void bio_disassociate_task(struct bio
*bio
);
523 void bio_clone_blkcg_association(struct bio
*dst
, struct bio
*src
);
524 #else /* CONFIG_BLK_CGROUP */
525 static inline int bio_associate_blkcg(struct bio
*bio
,
526 struct cgroup_subsys_state
*blkcg_css
) { return 0; }
527 static inline void bio_disassociate_task(struct bio
*bio
) { }
528 static inline void bio_clone_blkcg_association(struct bio
*dst
,
530 #endif /* CONFIG_BLK_CGROUP */
532 #ifdef CONFIG_HIGHMEM
534 * remember never ever reenable interrupts between a bvec_kmap_irq and
537 static inline char *bvec_kmap_irq(struct bio_vec
*bvec
, unsigned long *flags
)
542 * might not be a highmem page, but the preempt/irq count
543 * balancing is a lot nicer this way
545 local_irq_save(*flags
);
546 addr
= (unsigned long) kmap_atomic(bvec
->bv_page
);
548 BUG_ON(addr
& ~PAGE_MASK
);
550 return (char *) addr
+ bvec
->bv_offset
;
553 static inline void bvec_kunmap_irq(char *buffer
, unsigned long *flags
)
555 unsigned long ptr
= (unsigned long) buffer
& PAGE_MASK
;
557 kunmap_atomic((void *) ptr
);
558 local_irq_restore(*flags
);
562 static inline char *bvec_kmap_irq(struct bio_vec
*bvec
, unsigned long *flags
)
564 return page_address(bvec
->bv_page
) + bvec
->bv_offset
;
567 static inline void bvec_kunmap_irq(char *buffer
, unsigned long *flags
)
574 * BIO list management for use by remapping drivers (e.g. DM or MD) and loop.
576 * A bio_list anchors a singly-linked list of bios chained through the bi_next
577 * member of the bio. The bio_list also caches the last list member to allow
578 * fast access to the tail.
585 static inline int bio_list_empty(const struct bio_list
*bl
)
587 return bl
->head
== NULL
;
590 static inline void bio_list_init(struct bio_list
*bl
)
592 bl
->head
= bl
->tail
= NULL
;
595 #define BIO_EMPTY_LIST { NULL, NULL }
597 #define bio_list_for_each(bio, bl) \
598 for (bio = (bl)->head; bio; bio = bio->bi_next)
600 static inline unsigned bio_list_size(const struct bio_list
*bl
)
605 bio_list_for_each(bio
, bl
)
611 static inline void bio_list_add(struct bio_list
*bl
, struct bio
*bio
)
616 bl
->tail
->bi_next
= bio
;
623 static inline void bio_list_add_head(struct bio_list
*bl
, struct bio
*bio
)
625 bio
->bi_next
= bl
->head
;
633 static inline void bio_list_merge(struct bio_list
*bl
, struct bio_list
*bl2
)
639 bl
->tail
->bi_next
= bl2
->head
;
641 bl
->head
= bl2
->head
;
643 bl
->tail
= bl2
->tail
;
646 static inline void bio_list_merge_head(struct bio_list
*bl
,
647 struct bio_list
*bl2
)
653 bl2
->tail
->bi_next
= bl
->head
;
655 bl
->tail
= bl2
->tail
;
657 bl
->head
= bl2
->head
;
660 static inline struct bio
*bio_list_peek(struct bio_list
*bl
)
665 static inline struct bio
*bio_list_pop(struct bio_list
*bl
)
667 struct bio
*bio
= bl
->head
;
670 bl
->head
= bl
->head
->bi_next
;
680 static inline struct bio
*bio_list_get(struct bio_list
*bl
)
682 struct bio
*bio
= bl
->head
;
684 bl
->head
= bl
->tail
= NULL
;
690 * Increment chain count for the bio. Make sure the CHAIN flag update
691 * is visible before the raised count.
693 static inline void bio_inc_remaining(struct bio
*bio
)
695 bio_set_flag(bio
, BIO_CHAIN
);
696 smp_mb__before_atomic();
697 atomic_inc(&bio
->__bi_remaining
);
701 * bio_set is used to allow other portions of the IO system to
702 * allocate their own private memory pools for bio and iovec structures.
703 * These memory pools in turn all allocate from the bio_slab
704 * and the bvec_slabs[].
706 #define BIO_POOL_SIZE 2
709 struct kmem_cache
*bio_slab
;
710 unsigned int front_pad
;
713 mempool_t
*bvec_pool
;
714 #if defined(CONFIG_BLK_DEV_INTEGRITY)
715 mempool_t
*bio_integrity_pool
;
716 mempool_t
*bvec_integrity_pool
;
720 * Deadlock avoidance for stacking block drivers: see comments in
721 * bio_alloc_bioset() for details
723 spinlock_t rescue_lock
;
724 struct bio_list rescue_list
;
725 struct work_struct rescue_work
;
726 struct workqueue_struct
*rescue_workqueue
;
732 struct kmem_cache
*slab
;
736 * a small number of entries is fine, not going to be performance critical.
737 * basically we just need to survive
739 #define BIO_SPLIT_ENTRIES 2
741 #if defined(CONFIG_BLK_DEV_INTEGRITY)
743 #define bip_for_each_vec(bvl, bip, iter) \
744 for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter)
746 #define bio_for_each_integrity_vec(_bvl, _bio, _iter) \
748 bip_for_each_vec(_bvl, _bio->bi_integrity, _iter)
750 extern struct bio_integrity_payload
*bio_integrity_alloc(struct bio
*, gfp_t
, unsigned int);
751 extern int bio_integrity_add_page(struct bio
*, struct page
*, unsigned int, unsigned int);
752 extern bool bio_integrity_prep(struct bio
*);
753 extern void bio_integrity_advance(struct bio
*, unsigned int);
754 extern void bio_integrity_trim(struct bio
*);
755 extern int bio_integrity_clone(struct bio
*, struct bio
*, gfp_t
);
756 extern int bioset_integrity_create(struct bio_set
*, int);
757 extern void bioset_integrity_free(struct bio_set
*);
758 extern void bio_integrity_init(void);
760 #else /* CONFIG_BLK_DEV_INTEGRITY */
762 static inline void *bio_integrity(struct bio
*bio
)
767 static inline int bioset_integrity_create(struct bio_set
*bs
, int pool_size
)
772 static inline void bioset_integrity_free (struct bio_set
*bs
)
777 static inline bool bio_integrity_prep(struct bio
*bio
)
782 static inline int bio_integrity_clone(struct bio
*bio
, struct bio
*bio_src
,
788 static inline void bio_integrity_advance(struct bio
*bio
,
789 unsigned int bytes_done
)
794 static inline void bio_integrity_trim(struct bio
*bio
)
799 static inline void bio_integrity_init(void)
804 static inline bool bio_integrity_flagged(struct bio
*bio
, enum bip_flags flag
)
809 static inline void *bio_integrity_alloc(struct bio
* bio
, gfp_t gfp
,
812 return ERR_PTR(-EINVAL
);
815 static inline int bio_integrity_add_page(struct bio
*bio
, struct page
*page
,
816 unsigned int len
, unsigned int offset
)
821 #endif /* CONFIG_BLK_DEV_INTEGRITY */
823 #endif /* CONFIG_BLOCK */
824 #endif /* __LINUX_BIO_H */