blob: ce33e6868a2f57116ae76510f4dc5de183c2b8fd [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Tejun Heo7cc01582010-08-03 13:14:58 +020012 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 * 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>
Jens Axboe22e2c502005-06-27 10:55:12 +020025#include <linux/ioprio.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
David Howells02a5e0a2007-08-11 22:34:32 +020027#ifdef CONFIG_BLOCK
28
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <asm/io.h>
30
Tejun Heo7cc01582010-08-03 13:14:58 +020031/* struct bio, bio_vec and BIO_* flags are defined in blk_types.h */
32#include <linux/blk_types.h>
33
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#define BIO_DEBUG
35
36#ifdef BIO_DEBUG
37#define BIO_BUG_ON BUG_ON
38#else
39#define BIO_BUG_ON
40#endif
41
Alexey Dobriyand84a8472006-06-25 05:49:32 -070042#define BIO_MAX_PAGES 256
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#define BIO_MAX_SIZE (BIO_MAX_PAGES << PAGE_CACHE_SHIFT)
44#define BIO_MAX_SECTORS (BIO_MAX_SIZE >> 9)
45
46/*
Jens Axboe22e2c502005-06-27 10:55:12 +020047 * upper 16 bits of bi_rw define the io priority of this bio
48 */
49#define BIO_PRIO_SHIFT (8 * sizeof(unsigned long) - IOPRIO_BITS)
50#define bio_prio(bio) ((bio)->bi_rw >> BIO_PRIO_SHIFT)
51#define bio_prio_valid(bio) ioprio_valid(bio_prio(bio))
52
53#define bio_set_prio(bio, prio) do { \
54 WARN_ON(prio >= (1 << IOPRIO_BITS)); \
55 (bio)->bi_rw &= ((1UL << BIO_PRIO_SHIFT) - 1); \
56 (bio)->bi_rw |= ((unsigned long) (prio) << BIO_PRIO_SHIFT); \
57} while (0)
58
59/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 * various member access, note that bio_data should of course not be used
61 * on highmem page vectors
62 */
63#define bio_iovec_idx(bio, idx) (&((bio)->bi_io_vec[(idx)]))
64#define bio_iovec(bio) bio_iovec_idx((bio), (bio)->bi_idx)
65#define bio_page(bio) bio_iovec((bio))->bv_page
66#define bio_offset(bio) bio_iovec((bio))->bv_offset
67#define bio_segments(bio) ((bio)->bi_vcnt - (bio)->bi_idx)
68#define bio_sectors(bio) ((bio)->bi_size >> 9)
Jens Axboebf2de6f2007-09-27 13:01:25 +020069
Tejun Heo2e46e8b2009-05-07 22:24:41 +090070static inline unsigned int bio_cur_bytes(struct bio *bio)
Jens Axboebf2de6f2007-09-27 13:01:25 +020071{
72 if (bio->bi_vcnt)
Tejun Heo2e46e8b2009-05-07 22:24:41 +090073 return bio_iovec(bio)->bv_len;
David Woodhousefb2dce82008-08-05 18:01:53 +010074 else /* dataless requests such as discard */
Tejun Heo2e46e8b2009-05-07 22:24:41 +090075 return bio->bi_size;
Jens Axboebf2de6f2007-09-27 13:01:25 +020076}
77
78static inline void *bio_data(struct bio *bio)
79{
80 if (bio->bi_vcnt)
81 return page_address(bio_page(bio)) + bio_offset(bio);
82
83 return NULL;
84}
Linus Torvalds1da177e2005-04-16 15:20:36 -070085
Jens Axboe392ddc32008-12-23 12:42:54 +010086static inline int bio_has_allocated_vec(struct bio *bio)
87{
88 return bio->bi_io_vec && bio->bi_io_vec != bio->bi_inline_vecs;
89}
90
Linus Torvalds1da177e2005-04-16 15:20:36 -070091/*
92 * will die
93 */
94#define bio_to_phys(bio) (page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio)))
95#define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset)
96
97/*
98 * queues that have highmem support enabled may still need to revert to
99 * PIO transfers occasionally and thus map high pages temporarily. For
100 * permanent PIO fall back, user is probably better off disabling highmem
101 * I/O completely on that queue (see ide-dma for example)
102 */
103#define __bio_kmap_atomic(bio, idx, kmtype) \
104 (kmap_atomic(bio_iovec_idx((bio), (idx))->bv_page, kmtype) + \
105 bio_iovec_idx((bio), (idx))->bv_offset)
106
107#define __bio_kunmap_atomic(addr, kmtype) kunmap_atomic(addr, kmtype)
108
109/*
110 * merge helpers etc
111 */
112
113#define __BVEC_END(bio) bio_iovec_idx((bio), (bio)->bi_vcnt - 1)
114#define __BVEC_START(bio) bio_iovec_idx((bio), (bio)->bi_idx)
115
Jeremy Fitzhardingef92131c2008-10-29 14:10:51 +0100116/* Default implementation of BIOVEC_PHYS_MERGEABLE */
117#define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
118 ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
119
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120/*
121 * allow arch override, for eg virtualized architectures (put in asm/io.h)
122 */
123#ifndef BIOVEC_PHYS_MERGEABLE
124#define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
Jeremy Fitzhardingef92131c2008-10-29 14:10:51 +0100125 __BIOVEC_PHYS_MERGEABLE(vec1, vec2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126#endif
127
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128#define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \
129 (((addr1) | (mask)) == (((addr2) - 1) | (mask)))
130#define BIOVEC_SEG_BOUNDARY(q, b1, b2) \
Martin K. Petersenae03bf62009-05-22 17:17:50 -0400131 __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132#define BIO_SEG_BOUNDARY(q, b1, b2) \
133 BIOVEC_SEG_BOUNDARY((q), __BVEC_END((b1)), __BVEC_START((b2)))
134
NeilBrown6712ecf2007-09-27 12:47:43 +0200135#define bio_io_error(bio) bio_endio((bio), -EIO)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
137/*
138 * drivers should not use the __ version unless they _really_ want to
139 * run through the entire bio and not just pending pieces
140 */
141#define __bio_for_each_segment(bvl, bio, i, start_idx) \
142 for (bvl = bio_iovec_idx((bio), (start_idx)), i = (start_idx); \
143 i < (bio)->bi_vcnt; \
144 bvl++, i++)
145
146#define bio_for_each_segment(bvl, bio, i) \
147 __bio_for_each_segment(bvl, bio, i, (bio)->bi_idx)
148
149/*
150 * get a reference to a bio, so it won't disappear. the intended use is
151 * something like:
152 *
153 * bio_get(bio);
154 * submit_bio(rw, bio);
155 * if (bio->bi_flags ...)
156 * do_something
157 * bio_put(bio);
158 *
159 * without the bio_get(), it could potentially complete I/O before submit_bio
160 * returns. and then bio would be freed memory when if (bio->bi_flags ...)
161 * runs
162 */
163#define bio_get(bio) atomic_inc(&(bio)->bi_cnt)
164
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200165#if defined(CONFIG_BLK_DEV_INTEGRITY)
166/*
167 * bio integrity payload
168 */
169struct bio_integrity_payload {
170 struct bio *bip_bio; /* parent bio */
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200171
172 sector_t bip_sector; /* virtual start sector */
173
174 void *bip_buf; /* generated integrity data */
175 bio_end_io_t *bip_end_io; /* saved I/O completion fn */
176
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200177 unsigned int bip_size;
178
Martin K. Petersen7878cba2009-06-26 15:37:49 +0200179 unsigned short bip_slab; /* slab the bip came from */
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200180 unsigned short bip_vcnt; /* # of integrity bio_vecs */
181 unsigned short bip_idx; /* current bip_vec index */
182
183 struct work_struct bip_work; /* I/O completion */
Martin K. Petersen7878cba2009-06-26 15:37:49 +0200184 struct bio_vec bip_vec[0]; /* embedded bvec array */
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200185};
186#endif /* CONFIG_BLK_DEV_INTEGRITY */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187
188/*
189 * A bio_pair is used when we need to split a bio.
190 * This can only happen for a bio that refers to just one
191 * page of data, and in the unusual situation when the
192 * page crosses a chunk/device boundary
193 *
194 * The address of the master bio is stored in bio1.bi_private
195 * The address of the pool the pair was allocated from is stored
196 * in bio2.bi_private
197 */
198struct bio_pair {
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200199 struct bio bio1, bio2;
200 struct bio_vec bv1, bv2;
201#if defined(CONFIG_BLK_DEV_INTEGRITY)
202 struct bio_integrity_payload bip1, bip2;
203 struct bio_vec iv1, iv2;
204#endif
205 atomic_t cnt;
206 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207};
Denis ChengRq6feef532008-10-09 08:57:05 +0200208extern struct bio_pair *bio_split(struct bio *bi, int first_sectors);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209extern void bio_pair_release(struct bio_pair *dbio);
210
Jens Axboebb799ca2008-12-10 15:35:05 +0100211extern struct bio_set *bioset_create(unsigned int, unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212extern void bioset_free(struct bio_set *);
213
Al Virodd0fc662005-10-07 07:46:04 +0100214extern struct bio *bio_alloc(gfp_t, int);
Jens Axboe0a0d96b2008-09-11 13:17:37 +0200215extern struct bio *bio_kmalloc(gfp_t, int);
Al Virodd0fc662005-10-07 07:46:04 +0100216extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217extern void bio_put(struct bio *);
Peter Osterlund36763472005-09-06 15:16:42 -0700218extern void bio_free(struct bio *, struct bio_set *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
NeilBrown6712ecf2007-09-27 12:47:43 +0200220extern void bio_endio(struct bio *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221struct request_queue;
222extern int bio_phys_segments(struct request_queue *, struct bio *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
224extern void __bio_clone(struct bio *, struct bio *);
Al Virodd0fc662005-10-07 07:46:04 +0100225extern struct bio *bio_clone(struct bio *, gfp_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226
227extern void bio_init(struct bio *);
228
229extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int);
Mike Christie6e68af62005-11-11 05:30:27 -0600230extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *,
231 unsigned int, unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232extern int bio_get_nr_vecs(struct block_device *);
Martin K. Petersenad3316b2008-10-01 22:42:53 -0400233extern sector_t bio_sector_offset(struct bio *, unsigned short, unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234extern struct bio *bio_map_user(struct request_queue *, struct block_device *,
FUJITA Tomonoria3bce902008-08-28 16:17:05 +0900235 unsigned long, unsigned int, int, gfp_t);
James Bottomley f1970ba2005-06-20 14:06:52 +0200236struct sg_iovec;
FUJITA Tomonori152e2832008-08-28 16:17:06 +0900237struct rq_map_data;
James Bottomley f1970ba2005-06-20 14:06:52 +0200238extern struct bio *bio_map_user_iov(struct request_queue *,
239 struct block_device *,
FUJITA Tomonoria3bce902008-08-28 16:17:05 +0900240 struct sg_iovec *, int, int, gfp_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241extern void bio_unmap_user(struct bio *);
Mike Christie df46b9a2005-06-20 14:04:44 +0200242extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int,
Al Viro27496a82005-10-21 03:20:48 -0400243 gfp_t);
FUJITA Tomonori68154e92008-04-25 12:47:50 +0200244extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int,
245 gfp_t, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246extern void bio_set_pages_dirty(struct bio *bio);
247extern void bio_check_pages_dirty(struct bio *bio);
Ilya Loginov2d4dc892009-11-26 09:16:19 +0100248
249#ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
250# error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
251#endif
252#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
253extern void bio_flush_dcache_pages(struct bio *bi);
254#else
255static inline void bio_flush_dcache_pages(struct bio *bi)
256{
257}
258#endif
259
FUJITA Tomonori152e2832008-08-28 16:17:06 +0900260extern struct bio *bio_copy_user(struct request_queue *, struct rq_map_data *,
261 unsigned long, unsigned int, int, gfp_t);
262extern struct bio *bio_copy_user_iov(struct request_queue *,
263 struct rq_map_data *, struct sg_iovec *,
FUJITA Tomonoria3bce902008-08-28 16:17:05 +0900264 int, int, gfp_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265extern int bio_uncopy_user(struct bio *);
266void zero_fill_bio(struct bio *bio);
Martin K. Petersen51d654e2008-06-17 18:59:56 +0200267extern struct bio_vec *bvec_alloc_bs(gfp_t, int, unsigned long *, struct bio_set *);
Jens Axboebb799ca2008-12-10 15:35:05 +0100268extern void bvec_free_bs(struct bio_set *, struct bio_vec *, unsigned int);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200269extern unsigned int bvec_nr_vecs(unsigned short idx);
Martin K. Petersen51d654e2008-06-17 18:59:56 +0200270
271/*
Jens Axboec7c22e42008-09-13 20:26:01 +0200272 * Allow queuer to specify a completion CPU for this bio
273 */
274static inline void bio_set_completion_cpu(struct bio *bio, unsigned int cpu)
275{
276 bio->bi_comp_cpu = cpu;
277}
278
279/*
Martin K. Petersen51d654e2008-06-17 18:59:56 +0200280 * bio_set is used to allow other portions of the IO system to
281 * allocate their own private memory pools for bio and iovec structures.
282 * These memory pools in turn all allocate from the bio_slab
283 * and the bvec_slabs[].
284 */
285#define BIO_POOL_SIZE 2
286#define BIOVEC_NR_POOLS 6
Jens Axboe7ff93452008-12-11 11:53:43 +0100287#define BIOVEC_MAX_IDX (BIOVEC_NR_POOLS - 1)
Martin K. Petersen51d654e2008-06-17 18:59:56 +0200288
289struct bio_set {
Jens Axboe1b434492008-10-22 20:32:58 +0200290 struct kmem_cache *bio_slab;
Jens Axboebb799ca2008-12-10 15:35:05 +0100291 unsigned int front_pad;
292
Martin K. Petersen51d654e2008-06-17 18:59:56 +0200293 mempool_t *bio_pool;
Martin K. Petersen7878cba2009-06-26 15:37:49 +0200294#if defined(CONFIG_BLK_DEV_INTEGRITY)
295 mempool_t *bio_integrity_pool;
296#endif
Jens Axboe7ff93452008-12-11 11:53:43 +0100297 mempool_t *bvec_pool;
Martin K. Petersen51d654e2008-06-17 18:59:56 +0200298};
299
300struct biovec_slab {
301 int nr_vecs;
302 char *name;
303 struct kmem_cache *slab;
304};
305
306extern struct bio_set *fs_bio_set;
307
308/*
309 * a small number of entries is fine, not going to be performance critical.
310 * basically we just need to survive
311 */
312#define BIO_SPLIT_ENTRIES 2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
314#ifdef CONFIG_HIGHMEM
315/*
Alberto Bertogli20b636b2009-02-02 12:41:07 +0100316 * remember never ever reenable interrupts between a bvec_kmap_irq and
317 * bvec_kunmap_irq!
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 */
Alberto Bertogli4f570f92009-11-02 11:40:16 +0100319static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320{
321 unsigned long addr;
322
323 /*
324 * might not be a highmem page, but the preempt/irq count
325 * balancing is a lot nicer this way
326 */
327 local_irq_save(*flags);
328 addr = (unsigned long) kmap_atomic(bvec->bv_page, KM_BIO_SRC_IRQ);
329
330 BUG_ON(addr & ~PAGE_MASK);
331
332 return (char *) addr + bvec->bv_offset;
333}
334
Alberto Bertogli4f570f92009-11-02 11:40:16 +0100335static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336{
337 unsigned long ptr = (unsigned long) buffer & PAGE_MASK;
338
339 kunmap_atomic((void *) ptr, KM_BIO_SRC_IRQ);
340 local_irq_restore(*flags);
341}
342
343#else
Geert Uytterhoeven11a691b2010-10-21 10:32:29 +0200344static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags)
345{
346 return page_address(bvec->bv_page) + bvec->bv_offset;
347}
348
349static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags)
350{
351 *flags = 0;
352}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353#endif
354
Adrian Bunkc2d08da2005-09-10 00:27:18 -0700355static inline char *__bio_kmap_irq(struct bio *bio, unsigned short idx,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 unsigned long *flags)
357{
358 return bvec_kmap_irq(bio_iovec_idx(bio, idx), flags);
359}
360#define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags)
361
362#define bio_kmap_irq(bio, flags) \
363 __bio_kmap_irq((bio), (bio)->bi_idx, (flags))
364#define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags)
365
Jens Axboe7a67f632008-08-08 11:17:12 +0200366/*
367 * Check whether this bio carries any data or not. A NULL bio is allowed.
368 */
369static inline int bio_has_data(struct bio *bio)
370{
371 return bio && bio->bi_io_vec != NULL;
372}
373
Christoph Hellwig8f3d8ba2009-04-07 19:55:13 +0200374/*
Akinobu Mitae6863072009-04-17 08:41:21 +0200375 * BIO list management for use by remapping drivers (e.g. DM or MD) and loop.
Christoph Hellwig8f3d8ba2009-04-07 19:55:13 +0200376 *
377 * A bio_list anchors a singly-linked list of bios chained through the bi_next
378 * member of the bio. The bio_list also caches the last list member to allow
379 * fast access to the tail.
380 */
381struct bio_list {
382 struct bio *head;
383 struct bio *tail;
384};
385
386static inline int bio_list_empty(const struct bio_list *bl)
387{
388 return bl->head == NULL;
389}
390
391static inline void bio_list_init(struct bio_list *bl)
392{
393 bl->head = bl->tail = NULL;
394}
395
396#define bio_list_for_each(bio, bl) \
397 for (bio = (bl)->head; bio; bio = bio->bi_next)
398
399static inline unsigned bio_list_size(const struct bio_list *bl)
400{
401 unsigned sz = 0;
402 struct bio *bio;
403
404 bio_list_for_each(bio, bl)
405 sz++;
406
407 return sz;
408}
409
410static inline void bio_list_add(struct bio_list *bl, struct bio *bio)
411{
412 bio->bi_next = NULL;
413
414 if (bl->tail)
415 bl->tail->bi_next = bio;
416 else
417 bl->head = bio;
418
419 bl->tail = bio;
420}
421
422static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio)
423{
424 bio->bi_next = bl->head;
425
426 bl->head = bio;
427
428 if (!bl->tail)
429 bl->tail = bio;
430}
431
432static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2)
433{
434 if (!bl2->head)
435 return;
436
437 if (bl->tail)
438 bl->tail->bi_next = bl2->head;
439 else
440 bl->head = bl2->head;
441
442 bl->tail = bl2->tail;
443}
444
445static inline void bio_list_merge_head(struct bio_list *bl,
446 struct bio_list *bl2)
447{
448 if (!bl2->head)
449 return;
450
451 if (bl->head)
452 bl2->tail->bi_next = bl->head;
453 else
454 bl->tail = bl2->tail;
455
456 bl->head = bl2->head;
457}
458
Geert Uytterhoeven13685a12009-06-10 04:38:40 +0000459static inline struct bio *bio_list_peek(struct bio_list *bl)
460{
461 return bl->head;
462}
463
Christoph Hellwig8f3d8ba2009-04-07 19:55:13 +0200464static inline struct bio *bio_list_pop(struct bio_list *bl)
465{
466 struct bio *bio = bl->head;
467
468 if (bio) {
469 bl->head = bl->head->bi_next;
470 if (!bl->head)
471 bl->tail = NULL;
472
473 bio->bi_next = NULL;
474 }
475
476 return bio;
477}
478
479static inline struct bio *bio_list_get(struct bio_list *bl)
480{
481 struct bio *bio = bl->head;
482
483 bl->head = bl->tail = NULL;
484
485 return bio;
486}
487
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200488#if defined(CONFIG_BLK_DEV_INTEGRITY)
489
490#define bip_vec_idx(bip, idx) (&(bip->bip_vec[(idx)]))
491#define bip_vec(bip) bip_vec_idx(bip, 0)
492
493#define __bip_for_each_vec(bvl, bip, i, start_idx) \
494 for (bvl = bip_vec_idx((bip), (start_idx)), i = (start_idx); \
495 i < (bip)->bip_vcnt; \
496 bvl++, i++)
497
498#define bip_for_each_vec(bvl, bip, i) \
499 __bip_for_each_vec(bvl, bip, i, (bip)->bip_idx)
500
Martin K. Petersen13f05c82010-09-10 20:50:10 +0200501#define bio_for_each_integrity_vec(_bvl, _bio, _iter) \
502 for_each_bio(_bio) \
503 bip_for_each_vec(_bvl, _bio->bi_integrity, _iter)
504
Alberto Bertogli8deaf722008-10-02 12:46:53 +0200505#define bio_integrity(bio) (bio->bi_integrity != NULL)
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200506
Martin K. Petersen7878cba2009-06-26 15:37:49 +0200507extern struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *, gfp_t, unsigned int, struct bio_set *);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200508extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int);
Martin K. Petersen7878cba2009-06-26 15:37:49 +0200509extern void bio_integrity_free(struct bio *, struct bio_set *);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200510extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int);
511extern int bio_integrity_enabled(struct bio *bio);
512extern int bio_integrity_set_tag(struct bio *, void *, unsigned int);
513extern int bio_integrity_get_tag(struct bio *, void *, unsigned int);
514extern int bio_integrity_prep(struct bio *);
515extern void bio_integrity_endio(struct bio *, int);
516extern void bio_integrity_advance(struct bio *, unsigned int);
517extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int);
518extern void bio_integrity_split(struct bio *, struct bio_pair *, int);
Martin K. Petersen7878cba2009-06-26 15:37:49 +0200519extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t, struct bio_set *);
520extern int bioset_integrity_create(struct bio_set *, int);
521extern void bioset_integrity_free(struct bio_set *);
522extern void bio_integrity_init(void);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200523
524#else /* CONFIG_BLK_DEV_INTEGRITY */
525
526#define bio_integrity(a) (0)
Martin K. Petersen7878cba2009-06-26 15:37:49 +0200527#define bioset_integrity_create(a, b) (0)
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200528#define bio_integrity_prep(a) (0)
529#define bio_integrity_enabled(a) (0)
Martin K. Petersen7878cba2009-06-26 15:37:49 +0200530#define bio_integrity_clone(a, b, c, d) (0)
531#define bioset_integrity_free(a) do { } while (0)
532#define bio_integrity_free(a, b) do { } while (0)
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200533#define bio_integrity_endio(a, b) do { } while (0)
534#define bio_integrity_advance(a, b) do { } while (0)
535#define bio_integrity_trim(a, b, c) do { } while (0)
536#define bio_integrity_split(a, b, c) do { } while (0)
537#define bio_integrity_set_tag(a, b, c) do { } while (0)
538#define bio_integrity_get_tag(a, b, c) do { } while (0)
Martin K. Petersen7878cba2009-06-26 15:37:49 +0200539#define bio_integrity_init(a) do { } while (0)
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200540
541#endif /* CONFIG_BLK_DEV_INTEGRITY */
542
David Howells02a5e0a2007-08-11 22:34:32 +0200543#endif /* CONFIG_BLOCK */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544#endif /* __LINUX_BIO_H */