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)
47 #define bio_op(bio) (op_from_rq_bits((bio)->bi_rw))
48 #define bio_set_op_attrs(bio, op, flags) ((bio)->bi_rw |= (op | flags))
51 * upper 16 bits of bi_rw define the io priority of this bio
53 #define BIO_PRIO_SHIFT (8 * sizeof(unsigned long) - IOPRIO_BITS)
54 #define bio_prio(bio) ((bio)->bi_rw >> BIO_PRIO_SHIFT)
55 #define bio_prio_valid(bio) ioprio_valid(bio_prio(bio))
57 #define bio_set_prio(bio, prio) do { \
58 WARN_ON(prio >= (1 << IOPRIO_BITS)); \
59 (bio)->bi_rw &= ((1UL << BIO_PRIO_SHIFT) - 1); \
60 (bio)->bi_rw |= ((unsigned long) (prio) << BIO_PRIO_SHIFT); \
64 * various member access, note that bio_data should of course not be used
65 * on highmem page vectors
67 #define __bvec_iter_bvec(bvec, iter) (&(bvec)[(iter).bi_idx])
69 #define bvec_iter_page(bvec, iter) \
70 (__bvec_iter_bvec((bvec), (iter))->bv_page)
72 #define bvec_iter_len(bvec, iter) \
74 __bvec_iter_bvec((bvec), (iter))->bv_len - (iter).bi_bvec_done)
76 #define bvec_iter_offset(bvec, iter) \
77 (__bvec_iter_bvec((bvec), (iter))->bv_offset + (iter).bi_bvec_done)
79 #define bvec_iter_bvec(bvec, iter) \
81 .bv_page = bvec_iter_page((bvec), (iter)), \
82 .bv_len = bvec_iter_len((bvec), (iter)), \
83 .bv_offset = bvec_iter_offset((bvec), (iter)), \
86 #define bio_iter_iovec(bio, iter) \
87 bvec_iter_bvec((bio)->bi_io_vec, (iter))
89 #define bio_iter_page(bio, iter) \
90 bvec_iter_page((bio)->bi_io_vec, (iter))
91 #define bio_iter_len(bio, iter) \
92 bvec_iter_len((bio)->bi_io_vec, (iter))
93 #define bio_iter_offset(bio, iter) \
94 bvec_iter_offset((bio)->bi_io_vec, (iter))
96 #define bio_page(bio) bio_iter_page((bio), (bio)->bi_iter)
97 #define bio_offset(bio) bio_iter_offset((bio), (bio)->bi_iter)
98 #define bio_iovec(bio) bio_iter_iovec((bio), (bio)->bi_iter)
100 #define bio_multiple_segments(bio) \
101 ((bio)->bi_iter.bi_size != bio_iovec(bio).bv_len)
102 #define bio_sectors(bio) ((bio)->bi_iter.bi_size >> 9)
103 #define bio_end_sector(bio) ((bio)->bi_iter.bi_sector + bio_sectors((bio)))
106 * Check whether this bio carries any data or not. A NULL bio is allowed.
108 static inline bool bio_has_data(struct bio *bio)
111 bio->bi_iter.bi_size &&
112 !(bio->bi_rw & REQ_DISCARD))
118 static inline bool bio_is_rw(struct bio *bio)
120 if (!bio_has_data(bio))
123 if (bio->bi_rw & BIO_NO_ADVANCE_ITER_MASK)
129 static inline bool bio_mergeable(struct bio *bio)
131 if (bio->bi_rw & REQ_NOMERGE_FLAGS)
137 static inline unsigned int bio_cur_bytes(struct bio *bio)
139 if (bio_has_data(bio))
140 return bio_iovec(bio).bv_len;
141 else /* dataless requests such as discard */
142 return bio->bi_iter.bi_size;
145 static inline void *bio_data(struct bio *bio)
147 if (bio_has_data(bio))
148 return page_address(bio_page(bio)) + bio_offset(bio);
156 #define bio_to_phys(bio) (page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio)))
157 #define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset)
160 * queues that have highmem support enabled may still need to revert to
161 * PIO transfers occasionally and thus map high pages temporarily. For
162 * permanent PIO fall back, user is probably better off disabling highmem
163 * I/O completely on that queue (see ide-dma for example)
165 #define __bio_kmap_atomic(bio, iter) \
166 (kmap_atomic(bio_iter_iovec((bio), (iter)).bv_page) + \
167 bio_iter_iovec((bio), (iter)).bv_offset)
169 #define __bio_kunmap_atomic(addr) kunmap_atomic(addr)
175 /* Default implementation of BIOVEC_PHYS_MERGEABLE */
176 #define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
177 ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
180 * allow arch override, for eg virtualized architectures (put in asm/io.h)
182 #ifndef BIOVEC_PHYS_MERGEABLE
183 #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
184 __BIOVEC_PHYS_MERGEABLE(vec1, vec2)
187 #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \
188 (((addr1) | (mask)) == (((addr2) - 1) | (mask)))
189 #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \
190 __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q)))
193 * drivers should _never_ use the all version - the bio may have been split
194 * before it got to the driver and the driver won't own all of it
196 #define bio_for_each_segment_all(bvl, bio, i) \
197 for (i = 0, bvl = (bio)->bi_io_vec; i < (bio)->bi_vcnt; i++, bvl++)
199 static inline void bvec_iter_advance(struct bio_vec *bv, struct bvec_iter *iter,
202 WARN_ONCE(bytes > iter->bi_size,
203 "Attempted to advance past end of bvec iter\n");
206 unsigned len = min(bytes, bvec_iter_len(bv, *iter));
209 iter->bi_size -= len;
210 iter->bi_bvec_done += len;
212 if (iter->bi_bvec_done == __bvec_iter_bvec(bv, *iter)->bv_len) {
213 iter->bi_bvec_done = 0;
219 #define for_each_bvec(bvl, bio_vec, iter, start) \
220 for (iter = (start); \
222 ((bvl = bvec_iter_bvec((bio_vec), (iter))), 1); \
223 bvec_iter_advance((bio_vec), &(iter), (bvl).bv_len))
226 static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter,
229 iter->bi_sector += bytes >> 9;
231 if (bio->bi_rw & BIO_NO_ADVANCE_ITER_MASK)
232 iter->bi_size -= bytes;
234 bvec_iter_advance(bio->bi_io_vec, iter, bytes);
237 #define __bio_for_each_segment(bvl, bio, iter, start) \
238 for (iter = (start); \
240 ((bvl = bio_iter_iovec((bio), (iter))), 1); \
241 bio_advance_iter((bio), &(iter), (bvl).bv_len))
243 #define bio_for_each_segment(bvl, bio, iter) \
244 __bio_for_each_segment(bvl, bio, iter, (bio)->bi_iter)
246 #define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len)
248 static inline unsigned bio_segments(struct bio *bio)
252 struct bvec_iter iter;
255 * We special case discard/write same, because they interpret bi_size
259 if (bio->bi_rw & REQ_DISCARD)
262 if (bio->bi_rw & REQ_WRITE_SAME)
265 bio_for_each_segment(bv, bio, iter)
272 * get a reference to a bio, so it won't disappear. the intended use is
276 * submit_bio(rw, bio);
277 * if (bio->bi_flags ...)
281 * without the bio_get(), it could potentially complete I/O before submit_bio
282 * returns. and then bio would be freed memory when if (bio->bi_flags ...)
285 static inline void bio_get(struct bio *bio)
287 bio->bi_flags |= (1 << BIO_REFFED);
288 smp_mb__before_atomic();
289 atomic_inc(&bio->__bi_cnt);
292 static inline void bio_cnt_set(struct bio *bio, unsigned int count)
295 bio->bi_flags |= (1 << BIO_REFFED);
296 smp_mb__before_atomic();
298 atomic_set(&bio->__bi_cnt, count);
301 static inline bool bio_flagged(struct bio *bio, unsigned int bit)
303 return (bio->bi_flags & (1U << bit)) != 0;
306 static inline void bio_set_flag(struct bio *bio, unsigned int bit)
308 bio->bi_flags |= (1U << bit);
311 static inline void bio_clear_flag(struct bio *bio, unsigned int bit)
313 bio->bi_flags &= ~(1U << bit);
316 static inline void bio_get_first_bvec(struct bio *bio, struct bio_vec *bv)
318 *bv = bio_iovec(bio);
321 static inline void bio_get_last_bvec(struct bio *bio, struct bio_vec *bv)
323 struct bvec_iter iter = bio->bi_iter;
326 if (unlikely(!bio_multiple_segments(bio))) {
327 *bv = bio_iovec(bio);
331 bio_advance_iter(bio, &iter, iter.bi_size);
333 if (!iter.bi_bvec_done)
334 idx = iter.bi_idx - 1;
335 else /* in the middle of bvec */
338 *bv = bio->bi_io_vec[idx];
341 * iter.bi_bvec_done records actual length of the last bvec
342 * if this bio ends in the middle of one io vector
344 if (iter.bi_bvec_done)
345 bv->bv_len = iter.bi_bvec_done;
349 BIP_BLOCK_INTEGRITY = 1 << 0, /* block layer owns integrity data */
350 BIP_MAPPED_INTEGRITY = 1 << 1, /* ref tag has been remapped */
351 BIP_CTRL_NOCHECK = 1 << 2, /* disable HBA integrity checking */
352 BIP_DISK_NOCHECK = 1 << 3, /* disable disk integrity checking */
353 BIP_IP_CHECKSUM = 1 << 4, /* IP checksum */
357 * bio integrity payload
359 struct bio_integrity_payload {
360 struct bio *bip_bio; /* parent bio */
362 struct bvec_iter bip_iter;
364 bio_end_io_t *bip_end_io; /* saved I/O completion fn */
366 unsigned short bip_slab; /* slab the bip came from */
367 unsigned short bip_vcnt; /* # of integrity bio_vecs */
368 unsigned short bip_max_vcnt; /* integrity bio_vec slots */
369 unsigned short bip_flags; /* control flags */
371 struct work_struct bip_work; /* I/O completion */
373 struct bio_vec *bip_vec;
374 struct bio_vec bip_inline_vecs[0];/* embedded bvec array */
377 #if defined(CONFIG_BLK_DEV_INTEGRITY)
379 static inline struct bio_integrity_payload *bio_integrity(struct bio *bio)
381 if (bio->bi_rw & REQ_INTEGRITY)
382 return bio->bi_integrity;
387 static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag)
389 struct bio_integrity_payload *bip = bio_integrity(bio);
392 return bip->bip_flags & flag;
397 static inline sector_t bip_get_seed(struct bio_integrity_payload *bip)
399 return bip->bip_iter.bi_sector;
402 static inline void bip_set_seed(struct bio_integrity_payload *bip,
405 bip->bip_iter.bi_sector = seed;
408 #endif /* CONFIG_BLK_DEV_INTEGRITY */
410 extern void bio_trim(struct bio *bio, int offset, int size);
411 extern struct bio *bio_split(struct bio *bio, int sectors,
412 gfp_t gfp, struct bio_set *bs);
415 * bio_next_split - get next @sectors from a bio, splitting if necessary
417 * @sectors: number of sectors to split from the front of @bio
419 * @bs: bio set to allocate from
421 * Returns a bio representing the next @sectors of @bio - if the bio is smaller
422 * than @sectors, returns the original bio unchanged.
424 static inline struct bio *bio_next_split(struct bio *bio, int sectors,
425 gfp_t gfp, struct bio_set *bs)
427 if (sectors >= bio_sectors(bio))
430 return bio_split(bio, sectors, gfp, bs);
433 extern struct bio_set *bioset_create(unsigned int, unsigned int);
434 extern struct bio_set *bioset_create_nobvec(unsigned int, unsigned int);
435 extern void bioset_free(struct bio_set *);
436 extern mempool_t *biovec_create_pool(int pool_entries);
438 extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *);
439 extern void bio_put(struct bio *);
441 extern void __bio_clone_fast(struct bio *, struct bio *);
442 extern struct bio *bio_clone_fast(struct bio *, gfp_t, struct bio_set *);
443 extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs);
445 extern struct bio_set *fs_bio_set;
447 static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs)
449 return bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set);
452 static inline struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask)
454 return bio_clone_bioset(bio, gfp_mask, fs_bio_set);
457 static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs)
459 return bio_alloc_bioset(gfp_mask, nr_iovecs, NULL);
462 static inline struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask)
464 return bio_clone_bioset(bio, gfp_mask, NULL);
468 extern void bio_endio(struct bio *);
470 static inline void bio_io_error(struct bio *bio)
472 bio->bi_error = -EIO;
476 struct request_queue;
477 extern int bio_phys_segments(struct request_queue *, struct bio *);
479 extern int submit_bio_wait(struct bio *bio);
480 extern void bio_advance(struct bio *, unsigned);
482 extern void bio_init(struct bio *);
483 extern void bio_reset(struct bio *);
484 void bio_chain(struct bio *, struct bio *);
486 extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int);
487 extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *,
488 unsigned int, unsigned int);
490 extern struct bio *bio_map_user_iov(struct request_queue *,
491 const struct iov_iter *, gfp_t);
492 extern void bio_unmap_user(struct bio *);
493 extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int,
495 extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int,
497 extern void bio_set_pages_dirty(struct bio *bio);
498 extern void bio_check_pages_dirty(struct bio *bio);
500 void generic_start_io_acct(int rw, unsigned long sectors,
501 struct hd_struct *part);
502 void generic_end_io_acct(int rw, struct hd_struct *part,
503 unsigned long start_time);
505 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
506 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
508 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
509 extern void bio_flush_dcache_pages(struct bio *bi);
511 static inline void bio_flush_dcache_pages(struct bio *bi)
516 extern void bio_copy_data(struct bio *dst, struct bio *src);
517 extern int bio_alloc_pages(struct bio *bio, gfp_t gfp);
519 extern struct bio *bio_copy_user_iov(struct request_queue *,
520 struct rq_map_data *,
521 const struct iov_iter *,
523 extern int bio_uncopy_user(struct bio *);
524 void zero_fill_bio(struct bio *bio);
525 extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *);
526 extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int);
527 extern unsigned int bvec_nr_vecs(unsigned short idx);
529 #ifdef CONFIG_BLK_CGROUP
530 int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css);
531 int bio_associate_current(struct bio *bio);
532 void bio_disassociate_task(struct bio *bio);
533 #else /* CONFIG_BLK_CGROUP */
534 static inline int bio_associate_blkcg(struct bio *bio,
535 struct cgroup_subsys_state *blkcg_css) { return 0; }
536 static inline int bio_associate_current(struct bio *bio) { return -ENOENT; }
537 static inline void bio_disassociate_task(struct bio *bio) { }
538 #endif /* CONFIG_BLK_CGROUP */
540 #ifdef CONFIG_HIGHMEM
542 * remember never ever reenable interrupts between a bvec_kmap_irq and
545 static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags)
550 * might not be a highmem page, but the preempt/irq count
551 * balancing is a lot nicer this way
553 local_irq_save(*flags);
554 addr = (unsigned long) kmap_atomic(bvec->bv_page);
556 BUG_ON(addr & ~PAGE_MASK);
558 return (char *) addr + bvec->bv_offset;
561 static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags)
563 unsigned long ptr = (unsigned long) buffer & PAGE_MASK;
565 kunmap_atomic((void *) ptr);
566 local_irq_restore(*flags);
570 static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags)
572 return page_address(bvec->bv_page) + bvec->bv_offset;
575 static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags)
581 static inline char *__bio_kmap_irq(struct bio *bio, struct bvec_iter iter,
582 unsigned long *flags)
584 return bvec_kmap_irq(&bio_iter_iovec(bio, iter), flags);
586 #define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags)
588 #define bio_kmap_irq(bio, flags) \
589 __bio_kmap_irq((bio), (bio)->bi_iter, (flags))
590 #define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags)
593 * BIO list management for use by remapping drivers (e.g. DM or MD) and loop.
595 * A bio_list anchors a singly-linked list of bios chained through the bi_next
596 * member of the bio. The bio_list also caches the last list member to allow
597 * fast access to the tail.
604 static inline int bio_list_empty(const struct bio_list *bl)
606 return bl->head == NULL;
609 static inline void bio_list_init(struct bio_list *bl)
611 bl->head = bl->tail = NULL;
614 #define BIO_EMPTY_LIST { NULL, NULL }
616 #define bio_list_for_each(bio, bl) \
617 for (bio = (bl)->head; bio; bio = bio->bi_next)
619 static inline unsigned bio_list_size(const struct bio_list *bl)
624 bio_list_for_each(bio, bl)
630 static inline void bio_list_add(struct bio_list *bl, struct bio *bio)
635 bl->tail->bi_next = bio;
642 static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio)
644 bio->bi_next = bl->head;
652 static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2)
658 bl->tail->bi_next = bl2->head;
660 bl->head = bl2->head;
662 bl->tail = bl2->tail;
665 static inline void bio_list_merge_head(struct bio_list *bl,
666 struct bio_list *bl2)
672 bl2->tail->bi_next = bl->head;
674 bl->tail = bl2->tail;
676 bl->head = bl2->head;
679 static inline struct bio *bio_list_peek(struct bio_list *bl)
684 static inline struct bio *bio_list_pop(struct bio_list *bl)
686 struct bio *bio = bl->head;
689 bl->head = bl->head->bi_next;
699 static inline struct bio *bio_list_get(struct bio_list *bl)
701 struct bio *bio = bl->head;
703 bl->head = bl->tail = NULL;
709 * Increment chain count for the bio. Make sure the CHAIN flag update
710 * is visible before the raised count.
712 static inline void bio_inc_remaining(struct bio *bio)
714 bio_set_flag(bio, BIO_CHAIN);
715 smp_mb__before_atomic();
716 atomic_inc(&bio->__bi_remaining);
720 * bio_set is used to allow other portions of the IO system to
721 * allocate their own private memory pools for bio and iovec structures.
722 * These memory pools in turn all allocate from the bio_slab
723 * and the bvec_slabs[].
725 #define BIO_POOL_SIZE 2
726 #define BIOVEC_NR_POOLS 6
727 #define BIOVEC_MAX_IDX (BIOVEC_NR_POOLS - 1)
730 struct kmem_cache *bio_slab;
731 unsigned int front_pad;
734 mempool_t *bvec_pool;
735 #if defined(CONFIG_BLK_DEV_INTEGRITY)
736 mempool_t *bio_integrity_pool;
737 mempool_t *bvec_integrity_pool;
741 * Deadlock avoidance for stacking block drivers: see comments in
742 * bio_alloc_bioset() for details
744 spinlock_t rescue_lock;
745 struct bio_list rescue_list;
746 struct work_struct rescue_work;
747 struct workqueue_struct *rescue_workqueue;
753 struct kmem_cache *slab;
757 * a small number of entries is fine, not going to be performance critical.
758 * basically we just need to survive
760 #define BIO_SPLIT_ENTRIES 2
762 #if defined(CONFIG_BLK_DEV_INTEGRITY)
764 #define bip_for_each_vec(bvl, bip, iter) \
765 for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter)
767 #define bio_for_each_integrity_vec(_bvl, _bio, _iter) \
769 bip_for_each_vec(_bvl, _bio->bi_integrity, _iter)
771 extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int);
772 extern void bio_integrity_free(struct bio *);
773 extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int);
774 extern bool bio_integrity_enabled(struct bio *bio);
775 extern int bio_integrity_prep(struct bio *);
776 extern void bio_integrity_endio(struct bio *);
777 extern void bio_integrity_advance(struct bio *, unsigned int);
778 extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int);
779 extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t);
780 extern int bioset_integrity_create(struct bio_set *, int);
781 extern void bioset_integrity_free(struct bio_set *);
782 extern void bio_integrity_init(void);
784 #else /* CONFIG_BLK_DEV_INTEGRITY */
786 static inline void *bio_integrity(struct bio *bio)
791 static inline bool bio_integrity_enabled(struct bio *bio)
796 static inline int bioset_integrity_create(struct bio_set *bs, int pool_size)
801 static inline void bioset_integrity_free (struct bio_set *bs)
806 static inline int bio_integrity_prep(struct bio *bio)
811 static inline void bio_integrity_free(struct bio *bio)
816 static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src,
822 static inline void bio_integrity_advance(struct bio *bio,
823 unsigned int bytes_done)
828 static inline void bio_integrity_trim(struct bio *bio, unsigned int offset,
829 unsigned int sectors)
834 static inline void bio_integrity_init(void)
839 static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag)
844 static inline void *bio_integrity_alloc(struct bio * bio, gfp_t gfp,
847 return ERR_PTR(-EINVAL);
850 static inline int bio_integrity_add_page(struct bio *bio, struct page *page,
851 unsigned int len, unsigned int offset)
856 #endif /* CONFIG_BLK_DEV_INTEGRITY */
858 #endif /* CONFIG_BLOCK */
859 #endif /* __LINUX_BIO_H */