thinkpad-acpi: name event constants
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / include / linux / bio.h
blob2892b710771c5b112b74670c56051ccffb05e7da
1 /*
2 * 2.5 block I/O model
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-
20 #ifndef __LINUX_BIO_H
21 #define __LINUX_BIO_H
23 #include <linux/highmem.h>
24 #include <linux/mempool.h>
25 #include <linux/ioprio.h>
27 #ifdef CONFIG_BLOCK
29 #include <asm/io.h>
31 #define BIO_DEBUG
33 #ifdef BIO_DEBUG
34 #define BIO_BUG_ON BUG_ON
35 #else
36 #define BIO_BUG_ON
37 #endif
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
46 struct bio_vec {
47 struct page *bv_page;
48 unsigned int bv_len;
49 unsigned int bv_offset;
52 struct bio_set;
53 struct bio;
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
60 * stacking drivers)
62 struct bio {
63 sector_t bi_sector; /* device address in 512 byte
64 sectors */
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,
69 * top bits priority
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;
99 void *bi_private;
100 #if defined(CONFIG_BLK_DEV_INTEGRITY)
101 struct bio_integrity_payload *bi_integrity; /* data integrity */
102 #endif
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];
115 * bio flags
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 * bio bi_rw flags
143 * bit 0 -- data direction
144 * If not set, bio is a read from device. If set, it's a write to device.
145 * bit 1 -- rw-ahead when set
146 * bit 2 -- barrier
147 * Insert a serialization point in the IO queue, forcing previously
148 * submitted IO to be completed before this one is issued.
149 * bit 3 -- synchronous I/O hint.
150 * bit 4 -- Unplug the device immediately after submitting this bio.
151 * bit 5 -- metadata request
152 * Used for tracing to differentiate metadata and data IO. May also
153 * get some preferential treatment in the IO scheduler
154 * bit 6 -- discard sectors
155 * Informs the lower level device that this range of sectors is no longer
156 * used by the file system and may thus be freed by the device. Used
157 * for flash based storage.
158 * bit 7 -- fail fast device errors
159 * bit 8 -- fail fast transport errors
160 * bit 9 -- fail fast driver errors
161 * Don't want driver retries for any fast fail whatever the reason.
162 * bit 10 -- Tell the IO scheduler not to wait for more requests after this
163 one has been submitted, even if it is a SYNC request.
165 #define BIO_RW 0 /* Must match RW in req flags (blkdev.h) */
166 #define BIO_RW_AHEAD 1 /* Must match FAILFAST in req flags */
167 #define BIO_RW_BARRIER 2
168 #define BIO_RW_SYNCIO 3
169 #define BIO_RW_UNPLUG 4
170 #define BIO_RW_META 5
171 #define BIO_RW_DISCARD 6
172 #define BIO_RW_FAILFAST_DEV 7
173 #define BIO_RW_FAILFAST_TRANSPORT 8
174 #define BIO_RW_FAILFAST_DRIVER 9
175 #define BIO_RW_NOIDLE 10
177 #define bio_rw_flagged(bio, flag) ((bio)->bi_rw & (1 << (flag)))
180 * Old defines, these should eventually be replaced by direct usage of
181 * bio_rw_flagged()
183 #define bio_barrier(bio) bio_rw_flagged(bio, BIO_RW_BARRIER)
184 #define bio_sync(bio) bio_rw_flagged(bio, BIO_RW_SYNCIO)
185 #define bio_unplug(bio) bio_rw_flagged(bio, BIO_RW_UNPLUG)
186 #define bio_failfast_dev(bio) bio_rw_flagged(bio, BIO_RW_FAILFAST_DEV)
187 #define bio_failfast_transport(bio) \
188 bio_rw_flagged(bio, BIO_RW_FAILFAST_TRANSPORT)
189 #define bio_failfast_driver(bio) \
190 bio_rw_flagged(bio, BIO_RW_FAILFAST_DRIVER)
191 #define bio_rw_ahead(bio) bio_rw_flagged(bio, BIO_RW_AHEAD)
192 #define bio_rw_meta(bio) bio_rw_flagged(bio, BIO_RW_META)
193 #define bio_discard(bio) bio_rw_flagged(bio, BIO_RW_DISCARD)
194 #define bio_noidle(bio) bio_rw_flagged(bio, BIO_RW_NOIDLE)
197 * upper 16 bits of bi_rw define the io priority of this bio
199 #define BIO_PRIO_SHIFT (8 * sizeof(unsigned long) - IOPRIO_BITS)
200 #define bio_prio(bio) ((bio)->bi_rw >> BIO_PRIO_SHIFT)
201 #define bio_prio_valid(bio) ioprio_valid(bio_prio(bio))
203 #define bio_set_prio(bio, prio) do { \
204 WARN_ON(prio >= (1 << IOPRIO_BITS)); \
205 (bio)->bi_rw &= ((1UL << BIO_PRIO_SHIFT) - 1); \
206 (bio)->bi_rw |= ((unsigned long) (prio) << BIO_PRIO_SHIFT); \
207 } while (0)
210 * various member access, note that bio_data should of course not be used
211 * on highmem page vectors
213 #define bio_iovec_idx(bio, idx) (&((bio)->bi_io_vec[(idx)]))
214 #define bio_iovec(bio) bio_iovec_idx((bio), (bio)->bi_idx)
215 #define bio_page(bio) bio_iovec((bio))->bv_page
216 #define bio_offset(bio) bio_iovec((bio))->bv_offset
217 #define bio_segments(bio) ((bio)->bi_vcnt - (bio)->bi_idx)
218 #define bio_sectors(bio) ((bio)->bi_size >> 9)
219 #define bio_empty_barrier(bio) (bio_barrier(bio) && !bio_has_data(bio) && !bio_discard(bio))
221 static inline unsigned int bio_cur_bytes(struct bio *bio)
223 if (bio->bi_vcnt)
224 return bio_iovec(bio)->bv_len;
225 else /* dataless requests such as discard */
226 return bio->bi_size;
229 static inline void *bio_data(struct bio *bio)
231 if (bio->bi_vcnt)
232 return page_address(bio_page(bio)) + bio_offset(bio);
234 return NULL;
237 static inline int bio_has_allocated_vec(struct bio *bio)
239 return bio->bi_io_vec && bio->bi_io_vec != bio->bi_inline_vecs;
243 * will die
245 #define bio_to_phys(bio) (page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio)))
246 #define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset)
249 * queues that have highmem support enabled may still need to revert to
250 * PIO transfers occasionally and thus map high pages temporarily. For
251 * permanent PIO fall back, user is probably better off disabling highmem
252 * I/O completely on that queue (see ide-dma for example)
254 #define __bio_kmap_atomic(bio, idx, kmtype) \
255 (kmap_atomic(bio_iovec_idx((bio), (idx))->bv_page, kmtype) + \
256 bio_iovec_idx((bio), (idx))->bv_offset)
258 #define __bio_kunmap_atomic(addr, kmtype) kunmap_atomic(addr, kmtype)
261 * merge helpers etc
264 #define __BVEC_END(bio) bio_iovec_idx((bio), (bio)->bi_vcnt - 1)
265 #define __BVEC_START(bio) bio_iovec_idx((bio), (bio)->bi_idx)
267 /* Default implementation of BIOVEC_PHYS_MERGEABLE */
268 #define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
269 ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
272 * allow arch override, for eg virtualized architectures (put in asm/io.h)
274 #ifndef BIOVEC_PHYS_MERGEABLE
275 #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
276 __BIOVEC_PHYS_MERGEABLE(vec1, vec2)
277 #endif
279 #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \
280 (((addr1) | (mask)) == (((addr2) - 1) | (mask)))
281 #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \
282 __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q)))
283 #define BIO_SEG_BOUNDARY(q, b1, b2) \
284 BIOVEC_SEG_BOUNDARY((q), __BVEC_END((b1)), __BVEC_START((b2)))
286 #define bio_io_error(bio) bio_endio((bio), -EIO)
289 * drivers should not use the __ version unless they _really_ want to
290 * run through the entire bio and not just pending pieces
292 #define __bio_for_each_segment(bvl, bio, i, start_idx) \
293 for (bvl = bio_iovec_idx((bio), (start_idx)), i = (start_idx); \
294 i < (bio)->bi_vcnt; \
295 bvl++, i++)
297 #define bio_for_each_segment(bvl, bio, i) \
298 __bio_for_each_segment(bvl, bio, i, (bio)->bi_idx)
301 * get a reference to a bio, so it won't disappear. the intended use is
302 * something like:
304 * bio_get(bio);
305 * submit_bio(rw, bio);
306 * if (bio->bi_flags ...)
307 * do_something
308 * bio_put(bio);
310 * without the bio_get(), it could potentially complete I/O before submit_bio
311 * returns. and then bio would be freed memory when if (bio->bi_flags ...)
312 * runs
314 #define bio_get(bio) atomic_inc(&(bio)->bi_cnt)
316 #if defined(CONFIG_BLK_DEV_INTEGRITY)
318 * bio integrity payload
320 struct bio_integrity_payload {
321 struct bio *bip_bio; /* parent bio */
323 sector_t bip_sector; /* virtual start sector */
325 void *bip_buf; /* generated integrity data */
326 bio_end_io_t *bip_end_io; /* saved I/O completion fn */
328 unsigned int bip_size;
330 unsigned short bip_slab; /* slab the bip came from */
331 unsigned short bip_vcnt; /* # of integrity bio_vecs */
332 unsigned short bip_idx; /* current bip_vec index */
334 struct work_struct bip_work; /* I/O completion */
335 struct bio_vec bip_vec[0]; /* embedded bvec array */
337 #endif /* CONFIG_BLK_DEV_INTEGRITY */
340 * A bio_pair is used when we need to split a bio.
341 * This can only happen for a bio that refers to just one
342 * page of data, and in the unusual situation when the
343 * page crosses a chunk/device boundary
345 * The address of the master bio is stored in bio1.bi_private
346 * The address of the pool the pair was allocated from is stored
347 * in bio2.bi_private
349 struct bio_pair {
350 struct bio bio1, bio2;
351 struct bio_vec bv1, bv2;
352 #if defined(CONFIG_BLK_DEV_INTEGRITY)
353 struct bio_integrity_payload bip1, bip2;
354 struct bio_vec iv1, iv2;
355 #endif
356 atomic_t cnt;
357 int error;
359 extern struct bio_pair *bio_split(struct bio *bi, int first_sectors);
360 extern void bio_pair_release(struct bio_pair *dbio);
362 extern struct bio_set *bioset_create(unsigned int, unsigned int);
363 extern void bioset_free(struct bio_set *);
365 extern struct bio *bio_alloc(gfp_t, int);
366 extern struct bio *bio_kmalloc(gfp_t, int);
367 extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *);
368 extern void bio_put(struct bio *);
369 extern void bio_free(struct bio *, struct bio_set *);
371 extern void bio_endio(struct bio *, int);
372 struct request_queue;
373 extern int bio_phys_segments(struct request_queue *, struct bio *);
375 extern void __bio_clone(struct bio *, struct bio *);
376 extern struct bio *bio_clone(struct bio *, gfp_t);
378 extern void bio_init(struct bio *);
380 extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int);
381 extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *,
382 unsigned int, unsigned int);
383 extern int bio_get_nr_vecs(struct block_device *);
384 extern sector_t bio_sector_offset(struct bio *, unsigned short, unsigned int);
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 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 extern struct bio *bio_copy_user(struct request_queue *, struct rq_map_data *,
400 unsigned long, unsigned int, int, gfp_t);
401 extern struct bio *bio_copy_user_iov(struct request_queue *,
402 struct rq_map_data *, struct sg_iovec *,
403 int, int, gfp_t);
404 extern int bio_uncopy_user(struct bio *);
405 void zero_fill_bio(struct bio *bio);
406 extern struct bio_vec *bvec_alloc_bs(gfp_t, int, unsigned long *, struct bio_set *);
407 extern void bvec_free_bs(struct bio_set *, struct bio_vec *, unsigned int);
408 extern unsigned int bvec_nr_vecs(unsigned short idx);
411 * Allow queuer to specify a completion CPU for this bio
413 static inline void bio_set_completion_cpu(struct bio *bio, unsigned int cpu)
415 bio->bi_comp_cpu = cpu;
419 * bio_set is used to allow other portions of the IO system to
420 * allocate their own private memory pools for bio and iovec structures.
421 * These memory pools in turn all allocate from the bio_slab
422 * and the bvec_slabs[].
424 #define BIO_POOL_SIZE 2
425 #define BIOVEC_NR_POOLS 6
426 #define BIOVEC_MAX_IDX (BIOVEC_NR_POOLS - 1)
428 struct bio_set {
429 struct kmem_cache *bio_slab;
430 unsigned int front_pad;
432 mempool_t *bio_pool;
433 #if defined(CONFIG_BLK_DEV_INTEGRITY)
434 mempool_t *bio_integrity_pool;
435 #endif
436 mempool_t *bvec_pool;
439 struct biovec_slab {
440 int nr_vecs;
441 char *name;
442 struct kmem_cache *slab;
445 extern struct bio_set *fs_bio_set;
446 extern struct biovec_slab bvec_slabs[BIOVEC_NR_POOLS] __read_mostly;
449 * a small number of entries is fine, not going to be performance critical.
450 * basically we just need to survive
452 #define BIO_SPLIT_ENTRIES 2
454 #ifdef CONFIG_HIGHMEM
456 * remember never ever reenable interrupts between a bvec_kmap_irq and
457 * bvec_kunmap_irq!
459 * This function MUST be inlined - it plays with the CPU interrupt flags.
461 static __always_inline char *bvec_kmap_irq(struct bio_vec *bvec,
462 unsigned long *flags)
464 unsigned long addr;
467 * might not be a highmem page, but the preempt/irq count
468 * balancing is a lot nicer this way
470 local_irq_save(*flags);
471 addr = (unsigned long) kmap_atomic(bvec->bv_page, KM_BIO_SRC_IRQ);
473 BUG_ON(addr & ~PAGE_MASK);
475 return (char *) addr + bvec->bv_offset;
478 static __always_inline void bvec_kunmap_irq(char *buffer,
479 unsigned long *flags)
481 unsigned long ptr = (unsigned long) buffer & PAGE_MASK;
483 kunmap_atomic((void *) ptr, KM_BIO_SRC_IRQ);
484 local_irq_restore(*flags);
487 #else
488 #define bvec_kmap_irq(bvec, flags) (page_address((bvec)->bv_page) + (bvec)->bv_offset)
489 #define bvec_kunmap_irq(buf, flags) do { *(flags) = 0; } while (0)
490 #endif
492 static inline char *__bio_kmap_irq(struct bio *bio, unsigned short idx,
493 unsigned long *flags)
495 return bvec_kmap_irq(bio_iovec_idx(bio, idx), flags);
497 #define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags)
499 #define bio_kmap_irq(bio, flags) \
500 __bio_kmap_irq((bio), (bio)->bi_idx, (flags))
501 #define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags)
504 * Check whether this bio carries any data or not. A NULL bio is allowed.
506 static inline int bio_has_data(struct bio *bio)
508 return bio && bio->bi_io_vec != NULL;
512 * BIO list management for use by remapping drivers (e.g. DM or MD) and loop.
514 * A bio_list anchors a singly-linked list of bios chained through the bi_next
515 * member of the bio. The bio_list also caches the last list member to allow
516 * fast access to the tail.
518 struct bio_list {
519 struct bio *head;
520 struct bio *tail;
523 static inline int bio_list_empty(const struct bio_list *bl)
525 return bl->head == NULL;
528 static inline void bio_list_init(struct bio_list *bl)
530 bl->head = bl->tail = NULL;
533 #define bio_list_for_each(bio, bl) \
534 for (bio = (bl)->head; bio; bio = bio->bi_next)
536 static inline unsigned bio_list_size(const struct bio_list *bl)
538 unsigned sz = 0;
539 struct bio *bio;
541 bio_list_for_each(bio, bl)
542 sz++;
544 return sz;
547 static inline void bio_list_add(struct bio_list *bl, struct bio *bio)
549 bio->bi_next = NULL;
551 if (bl->tail)
552 bl->tail->bi_next = bio;
553 else
554 bl->head = bio;
556 bl->tail = bio;
559 static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio)
561 bio->bi_next = bl->head;
563 bl->head = bio;
565 if (!bl->tail)
566 bl->tail = bio;
569 static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2)
571 if (!bl2->head)
572 return;
574 if (bl->tail)
575 bl->tail->bi_next = bl2->head;
576 else
577 bl->head = bl2->head;
579 bl->tail = bl2->tail;
582 static inline void bio_list_merge_head(struct bio_list *bl,
583 struct bio_list *bl2)
585 if (!bl2->head)
586 return;
588 if (bl->head)
589 bl2->tail->bi_next = bl->head;
590 else
591 bl->tail = bl2->tail;
593 bl->head = bl2->head;
596 static inline struct bio *bio_list_peek(struct bio_list *bl)
598 return bl->head;
601 static inline struct bio *bio_list_pop(struct bio_list *bl)
603 struct bio *bio = bl->head;
605 if (bio) {
606 bl->head = bl->head->bi_next;
607 if (!bl->head)
608 bl->tail = NULL;
610 bio->bi_next = NULL;
613 return bio;
616 static inline struct bio *bio_list_get(struct bio_list *bl)
618 struct bio *bio = bl->head;
620 bl->head = bl->tail = NULL;
622 return bio;
625 #if defined(CONFIG_BLK_DEV_INTEGRITY)
627 #define bip_vec_idx(bip, idx) (&(bip->bip_vec[(idx)]))
628 #define bip_vec(bip) bip_vec_idx(bip, 0)
630 #define __bip_for_each_vec(bvl, bip, i, start_idx) \
631 for (bvl = bip_vec_idx((bip), (start_idx)), i = (start_idx); \
632 i < (bip)->bip_vcnt; \
633 bvl++, i++)
635 #define bip_for_each_vec(bvl, bip, i) \
636 __bip_for_each_vec(bvl, bip, i, (bip)->bip_idx)
638 #define bio_integrity(bio) (bio->bi_integrity != NULL)
640 extern struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *, gfp_t, unsigned int, struct bio_set *);
641 extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int);
642 extern void bio_integrity_free(struct bio *, struct bio_set *);
643 extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int);
644 extern int bio_integrity_enabled(struct bio *bio);
645 extern int bio_integrity_set_tag(struct bio *, void *, unsigned int);
646 extern int bio_integrity_get_tag(struct bio *, void *, unsigned int);
647 extern int bio_integrity_prep(struct bio *);
648 extern void bio_integrity_endio(struct bio *, int);
649 extern void bio_integrity_advance(struct bio *, unsigned int);
650 extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int);
651 extern void bio_integrity_split(struct bio *, struct bio_pair *, int);
652 extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t, struct bio_set *);
653 extern int bioset_integrity_create(struct bio_set *, int);
654 extern void bioset_integrity_free(struct bio_set *);
655 extern void bio_integrity_init(void);
657 #else /* CONFIG_BLK_DEV_INTEGRITY */
659 #define bio_integrity(a) (0)
660 #define bioset_integrity_create(a, b) (0)
661 #define bio_integrity_prep(a) (0)
662 #define bio_integrity_enabled(a) (0)
663 #define bio_integrity_clone(a, b, c, d) (0)
664 #define bioset_integrity_free(a) do { } while (0)
665 #define bio_integrity_free(a, b) do { } while (0)
666 #define bio_integrity_endio(a, b) do { } while (0)
667 #define bio_integrity_advance(a, b) do { } while (0)
668 #define bio_integrity_trim(a, b, c) do { } while (0)
669 #define bio_integrity_split(a, b, c) do { } while (0)
670 #define bio_integrity_set_tag(a, b, c) do { } while (0)
671 #define bio_integrity_get_tag(a, b, c) do { } while (0)
672 #define bio_integrity_init(a) do { } while (0)
674 #endif /* CONFIG_BLK_DEV_INTEGRITY */
676 #endif /* CONFIG_BLOCK */
677 #endif /* __LINUX_BIO_H */