Commit | Line | Data |
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1da177e4 LT |
1 | /* |
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 | |
12 | ||
13 | * 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> | |
22e2c507 | 25 | #include <linux/ioprio.h> |
1da177e4 | 26 | |
02a5e0ac DH |
27 | #ifdef CONFIG_BLOCK |
28 | ||
1da177e4 LT |
29 | #include <asm/io.h> |
30 | ||
1da177e4 LT |
31 | #define BIO_DEBUG |
32 | ||
33 | #ifdef BIO_DEBUG | |
34 | #define BIO_BUG_ON BUG_ON | |
35 | #else | |
36 | #define BIO_BUG_ON | |
37 | #endif | |
38 | ||
d84a8477 | 39 | #define BIO_MAX_PAGES 256 |
1da177e4 LT |
40 | #define BIO_MAX_SIZE (BIO_MAX_PAGES << PAGE_CACHE_SHIFT) |
41 | #define BIO_MAX_SECTORS (BIO_MAX_SIZE >> 9) | |
42 | ||
43 | /* | |
44 | * was unsigned short, but we might as well be ready for > 64kB I/O pages | |
45 | */ | |
46 | struct bio_vec { | |
47 | struct page *bv_page; | |
48 | unsigned int bv_len; | |
49 | unsigned int bv_offset; | |
50 | }; | |
51 | ||
52 | struct bio_set; | |
53 | struct bio; | |
7ba1ba12 | 54 | struct bio_integrity_payload; |
6712ecf8 | 55 | typedef void (bio_end_io_t) (struct bio *, int); |
1da177e4 LT |
56 | typedef void (bio_destructor_t) (struct bio *); |
57 | ||
58 | /* | |
59 | * main unit of I/O for the block layer and lower layers (ie drivers and | |
60 | * stacking drivers) | |
61 | */ | |
62 | struct bio { | |
2c2345c2 RG |
63 | sector_t bi_sector; /* device address in 512 byte |
64 | sectors */ | |
1da177e4 LT |
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 | |
70 | */ | |
71 | ||
72 | unsigned short bi_vcnt; /* how many bio_vec's */ | |
73 | unsigned short bi_idx; /* current index into bvl_vec */ | |
74 | ||
75 | /* Number of segments in this BIO after | |
76 | * physical address coalescing is performed. | |
77 | */ | |
5b99c2ff | 78 | unsigned int bi_phys_segments; |
1da177e4 | 79 | |
1da177e4 LT |
80 | unsigned int bi_size; /* residual I/O count */ |
81 | ||
1da177e4 LT |
82 | unsigned int bi_max_vecs; /* max bvl_vecs we can hold */ |
83 | ||
c7c22e4d JA |
84 | unsigned int bi_comp_cpu; /* completion CPU */ |
85 | ||
1da177e4 LT |
86 | struct bio_vec *bi_io_vec; /* the actual vec list */ |
87 | ||
88 | bio_end_io_t *bi_end_io; | |
89 | atomic_t bi_cnt; /* pin count */ | |
90 | ||
91 | void *bi_private; | |
7ba1ba12 MP |
92 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
93 | struct bio_integrity_payload *bi_integrity; /* data integrity */ | |
94 | #endif | |
1da177e4 LT |
95 | |
96 | bio_destructor_t *bi_destructor; /* destructor */ | |
1da177e4 LT |
97 | }; |
98 | ||
99 | /* | |
100 | * bio flags | |
101 | */ | |
102 | #define BIO_UPTODATE 0 /* ok after I/O completion */ | |
103 | #define BIO_RW_BLOCK 1 /* RW_AHEAD set, and read/write would block */ | |
104 | #define BIO_EOF 2 /* out-out-bounds error */ | |
5df97b91 | 105 | #define BIO_SEG_VALID 3 /* bi_phys_segments valid */ |
1da177e4 LT |
106 | #define BIO_CLONED 4 /* doesn't own data */ |
107 | #define BIO_BOUNCED 5 /* bio is a bounce bio */ | |
108 | #define BIO_USER_MAPPED 6 /* contains user pages */ | |
109 | #define BIO_EOPNOTSUPP 7 /* not supported */ | |
c7c22e4d | 110 | #define BIO_CPU_AFFINE 8 /* complete bio on same CPU as submitted */ |
81882766 | 111 | #define BIO_NULL_MAPPED 9 /* contains invalid user pages */ |
74aa8c2c | 112 | #define BIO_FS_INTEGRITY 10 /* fs owns integrity data, not block layer */ |
1da177e4 LT |
113 | #define bio_flagged(bio, flag) ((bio)->bi_flags & (1 << (flag))) |
114 | ||
115 | /* | |
116 | * top 4 bits of bio flags indicate the pool this bio came from | |
117 | */ | |
118 | #define BIO_POOL_BITS (4) | |
119 | #define BIO_POOL_OFFSET (BITS_PER_LONG - BIO_POOL_BITS) | |
120 | #define BIO_POOL_MASK (1UL << BIO_POOL_OFFSET) | |
121 | #define BIO_POOL_IDX(bio) ((bio)->bi_flags >> BIO_POOL_OFFSET) | |
122 | ||
123 | /* | |
124 | * bio bi_rw flags | |
125 | * | |
126 | * bit 0 -- read (not set) or write (set) | |
127 | * bit 1 -- rw-ahead when set | |
128 | * bit 2 -- barrier | |
129 | * bit 3 -- fail fast, don't want low level driver retries | |
130 | * bit 4 -- synchronous I/O hint: the block layer will unplug immediately | |
fb2dce86 DW |
131 | * bit 5 -- metadata request |
132 | * bit 6 -- discard sectors | |
1da177e4 | 133 | */ |
d628eaef DW |
134 | #define BIO_RW 0 /* Must match RW in req flags (blkdev.h) */ |
135 | #define BIO_RW_AHEAD 1 /* Must match FAILFAST in req flags */ | |
1da177e4 LT |
136 | #define BIO_RW_BARRIER 2 |
137 | #define BIO_RW_FAILFAST 3 | |
138 | #define BIO_RW_SYNC 4 | |
5404bc7a | 139 | #define BIO_RW_META 5 |
fb2dce86 | 140 | #define BIO_RW_DISCARD 6 |
1da177e4 | 141 | |
22e2c507 JA |
142 | /* |
143 | * upper 16 bits of bi_rw define the io priority of this bio | |
144 | */ | |
145 | #define BIO_PRIO_SHIFT (8 * sizeof(unsigned long) - IOPRIO_BITS) | |
146 | #define bio_prio(bio) ((bio)->bi_rw >> BIO_PRIO_SHIFT) | |
147 | #define bio_prio_valid(bio) ioprio_valid(bio_prio(bio)) | |
148 | ||
149 | #define bio_set_prio(bio, prio) do { \ | |
150 | WARN_ON(prio >= (1 << IOPRIO_BITS)); \ | |
151 | (bio)->bi_rw &= ((1UL << BIO_PRIO_SHIFT) - 1); \ | |
152 | (bio)->bi_rw |= ((unsigned long) (prio) << BIO_PRIO_SHIFT); \ | |
153 | } while (0) | |
154 | ||
1da177e4 LT |
155 | /* |
156 | * various member access, note that bio_data should of course not be used | |
157 | * on highmem page vectors | |
158 | */ | |
159 | #define bio_iovec_idx(bio, idx) (&((bio)->bi_io_vec[(idx)])) | |
160 | #define bio_iovec(bio) bio_iovec_idx((bio), (bio)->bi_idx) | |
161 | #define bio_page(bio) bio_iovec((bio))->bv_page | |
162 | #define bio_offset(bio) bio_iovec((bio))->bv_offset | |
163 | #define bio_segments(bio) ((bio)->bi_vcnt - (bio)->bi_idx) | |
164 | #define bio_sectors(bio) ((bio)->bi_size >> 9) | |
1da177e4 LT |
165 | #define bio_barrier(bio) ((bio)->bi_rw & (1 << BIO_RW_BARRIER)) |
166 | #define bio_sync(bio) ((bio)->bi_rw & (1 << BIO_RW_SYNC)) | |
167 | #define bio_failfast(bio) ((bio)->bi_rw & (1 << BIO_RW_FAILFAST)) | |
168 | #define bio_rw_ahead(bio) ((bio)->bi_rw & (1 << BIO_RW_AHEAD)) | |
5404bc7a | 169 | #define bio_rw_meta(bio) ((bio)->bi_rw & (1 << BIO_RW_META)) |
fb2dce86 | 170 | #define bio_discard(bio) ((bio)->bi_rw & (1 << BIO_RW_DISCARD)) |
e17fc0a1 | 171 | #define bio_empty_barrier(bio) (bio_barrier(bio) && !bio_has_data(bio) && !bio_discard(bio)) |
bf2de6f5 JA |
172 | |
173 | static inline unsigned int bio_cur_sectors(struct bio *bio) | |
174 | { | |
175 | if (bio->bi_vcnt) | |
176 | return bio_iovec(bio)->bv_len >> 9; | |
fb2dce86 DW |
177 | else /* dataless requests such as discard */ |
178 | return bio->bi_size >> 9; | |
bf2de6f5 JA |
179 | } |
180 | ||
181 | static inline void *bio_data(struct bio *bio) | |
182 | { | |
183 | if (bio->bi_vcnt) | |
184 | return page_address(bio_page(bio)) + bio_offset(bio); | |
185 | ||
186 | return NULL; | |
187 | } | |
1da177e4 LT |
188 | |
189 | /* | |
190 | * will die | |
191 | */ | |
192 | #define bio_to_phys(bio) (page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio))) | |
193 | #define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset) | |
194 | ||
195 | /* | |
196 | * queues that have highmem support enabled may still need to revert to | |
197 | * PIO transfers occasionally and thus map high pages temporarily. For | |
198 | * permanent PIO fall back, user is probably better off disabling highmem | |
199 | * I/O completely on that queue (see ide-dma for example) | |
200 | */ | |
201 | #define __bio_kmap_atomic(bio, idx, kmtype) \ | |
202 | (kmap_atomic(bio_iovec_idx((bio), (idx))->bv_page, kmtype) + \ | |
203 | bio_iovec_idx((bio), (idx))->bv_offset) | |
204 | ||
205 | #define __bio_kunmap_atomic(addr, kmtype) kunmap_atomic(addr, kmtype) | |
206 | ||
207 | /* | |
208 | * merge helpers etc | |
209 | */ | |
210 | ||
211 | #define __BVEC_END(bio) bio_iovec_idx((bio), (bio)->bi_vcnt - 1) | |
212 | #define __BVEC_START(bio) bio_iovec_idx((bio), (bio)->bi_idx) | |
213 | ||
214 | /* | |
215 | * allow arch override, for eg virtualized architectures (put in asm/io.h) | |
216 | */ | |
217 | #ifndef BIOVEC_PHYS_MERGEABLE | |
218 | #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ | |
219 | ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2))) | |
220 | #endif | |
221 | ||
1da177e4 LT |
222 | #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \ |
223 | (((addr1) | (mask)) == (((addr2) - 1) | (mask))) | |
224 | #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \ | |
225 | __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, (q)->seg_boundary_mask) | |
226 | #define BIO_SEG_BOUNDARY(q, b1, b2) \ | |
227 | BIOVEC_SEG_BOUNDARY((q), __BVEC_END((b1)), __BVEC_START((b2))) | |
228 | ||
6712ecf8 | 229 | #define bio_io_error(bio) bio_endio((bio), -EIO) |
1da177e4 LT |
230 | |
231 | /* | |
232 | * drivers should not use the __ version unless they _really_ want to | |
233 | * run through the entire bio and not just pending pieces | |
234 | */ | |
235 | #define __bio_for_each_segment(bvl, bio, i, start_idx) \ | |
236 | for (bvl = bio_iovec_idx((bio), (start_idx)), i = (start_idx); \ | |
237 | i < (bio)->bi_vcnt; \ | |
238 | bvl++, i++) | |
239 | ||
240 | #define bio_for_each_segment(bvl, bio, i) \ | |
241 | __bio_for_each_segment(bvl, bio, i, (bio)->bi_idx) | |
242 | ||
243 | /* | |
244 | * get a reference to a bio, so it won't disappear. the intended use is | |
245 | * something like: | |
246 | * | |
247 | * bio_get(bio); | |
248 | * submit_bio(rw, bio); | |
249 | * if (bio->bi_flags ...) | |
250 | * do_something | |
251 | * bio_put(bio); | |
252 | * | |
253 | * without the bio_get(), it could potentially complete I/O before submit_bio | |
254 | * returns. and then bio would be freed memory when if (bio->bi_flags ...) | |
255 | * runs | |
256 | */ | |
257 | #define bio_get(bio) atomic_inc(&(bio)->bi_cnt) | |
258 | ||
7ba1ba12 MP |
259 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
260 | /* | |
261 | * bio integrity payload | |
262 | */ | |
263 | struct bio_integrity_payload { | |
264 | struct bio *bip_bio; /* parent bio */ | |
265 | struct bio_vec *bip_vec; /* integrity data vector */ | |
266 | ||
267 | sector_t bip_sector; /* virtual start sector */ | |
268 | ||
269 | void *bip_buf; /* generated integrity data */ | |
270 | bio_end_io_t *bip_end_io; /* saved I/O completion fn */ | |
271 | ||
272 | int bip_error; /* saved I/O error */ | |
273 | unsigned int bip_size; | |
274 | ||
275 | unsigned short bip_pool; /* pool the ivec came from */ | |
276 | unsigned short bip_vcnt; /* # of integrity bio_vecs */ | |
277 | unsigned short bip_idx; /* current bip_vec index */ | |
278 | ||
279 | struct work_struct bip_work; /* I/O completion */ | |
280 | }; | |
281 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1da177e4 LT |
282 | |
283 | /* | |
284 | * A bio_pair is used when we need to split a bio. | |
285 | * This can only happen for a bio that refers to just one | |
286 | * page of data, and in the unusual situation when the | |
287 | * page crosses a chunk/device boundary | |
288 | * | |
289 | * The address of the master bio is stored in bio1.bi_private | |
290 | * The address of the pool the pair was allocated from is stored | |
291 | * in bio2.bi_private | |
292 | */ | |
293 | struct bio_pair { | |
7ba1ba12 MP |
294 | struct bio bio1, bio2; |
295 | struct bio_vec bv1, bv2; | |
296 | #if defined(CONFIG_BLK_DEV_INTEGRITY) | |
297 | struct bio_integrity_payload bip1, bip2; | |
298 | struct bio_vec iv1, iv2; | |
299 | #endif | |
300 | atomic_t cnt; | |
301 | int error; | |
1da177e4 LT |
302 | }; |
303 | extern struct bio_pair *bio_split(struct bio *bi, mempool_t *pool, | |
304 | int first_sectors); | |
305 | extern mempool_t *bio_split_pool; | |
306 | extern void bio_pair_release(struct bio_pair *dbio); | |
307 | ||
5972511b | 308 | extern struct bio_set *bioset_create(int, int); |
1da177e4 LT |
309 | extern void bioset_free(struct bio_set *); |
310 | ||
dd0fc66f | 311 | extern struct bio *bio_alloc(gfp_t, int); |
0a0d96b0 | 312 | extern struct bio *bio_kmalloc(gfp_t, int); |
dd0fc66f | 313 | extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *); |
1da177e4 | 314 | extern void bio_put(struct bio *); |
3676347a | 315 | extern void bio_free(struct bio *, struct bio_set *); |
1da177e4 | 316 | |
6712ecf8 | 317 | extern void bio_endio(struct bio *, int); |
1da177e4 LT |
318 | struct request_queue; |
319 | extern int bio_phys_segments(struct request_queue *, struct bio *); | |
1da177e4 LT |
320 | |
321 | extern void __bio_clone(struct bio *, struct bio *); | |
dd0fc66f | 322 | extern struct bio *bio_clone(struct bio *, gfp_t); |
1da177e4 LT |
323 | |
324 | extern void bio_init(struct bio *); | |
325 | ||
326 | extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int); | |
6e68af66 MC |
327 | extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *, |
328 | unsigned int, unsigned int); | |
1da177e4 LT |
329 | extern int bio_get_nr_vecs(struct block_device *); |
330 | extern struct bio *bio_map_user(struct request_queue *, struct block_device *, | |
a3bce90e | 331 | unsigned long, unsigned int, int, gfp_t); |
f1970baf | 332 | struct sg_iovec; |
152e283f | 333 | struct rq_map_data; |
f1970baf JB |
334 | extern struct bio *bio_map_user_iov(struct request_queue *, |
335 | struct block_device *, | |
a3bce90e | 336 | struct sg_iovec *, int, int, gfp_t); |
1da177e4 | 337 | extern void bio_unmap_user(struct bio *); |
df46b9a4 | 338 | extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int, |
27496a8c | 339 | gfp_t); |
68154e90 FT |
340 | extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int, |
341 | gfp_t, int); | |
1da177e4 LT |
342 | extern void bio_set_pages_dirty(struct bio *bio); |
343 | extern void bio_check_pages_dirty(struct bio *bio); | |
152e283f FT |
344 | extern struct bio *bio_copy_user(struct request_queue *, struct rq_map_data *, |
345 | unsigned long, unsigned int, int, gfp_t); | |
346 | extern struct bio *bio_copy_user_iov(struct request_queue *, | |
347 | struct rq_map_data *, struct sg_iovec *, | |
a3bce90e | 348 | int, int, gfp_t); |
1da177e4 LT |
349 | extern int bio_uncopy_user(struct bio *); |
350 | void zero_fill_bio(struct bio *bio); | |
51d654e1 | 351 | extern struct bio_vec *bvec_alloc_bs(gfp_t, int, unsigned long *, struct bio_set *); |
7ba1ba12 | 352 | extern unsigned int bvec_nr_vecs(unsigned short idx); |
51d654e1 | 353 | |
c7c22e4d JA |
354 | /* |
355 | * Allow queuer to specify a completion CPU for this bio | |
356 | */ | |
357 | static inline void bio_set_completion_cpu(struct bio *bio, unsigned int cpu) | |
358 | { | |
359 | bio->bi_comp_cpu = cpu; | |
360 | } | |
361 | ||
51d654e1 MP |
362 | /* |
363 | * bio_set is used to allow other portions of the IO system to | |
364 | * allocate their own private memory pools for bio and iovec structures. | |
365 | * These memory pools in turn all allocate from the bio_slab | |
366 | * and the bvec_slabs[]. | |
367 | */ | |
368 | #define BIO_POOL_SIZE 2 | |
369 | #define BIOVEC_NR_POOLS 6 | |
370 | ||
371 | struct bio_set { | |
372 | mempool_t *bio_pool; | |
7ba1ba12 MP |
373 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
374 | mempool_t *bio_integrity_pool; | |
375 | #endif | |
51d654e1 MP |
376 | mempool_t *bvec_pools[BIOVEC_NR_POOLS]; |
377 | }; | |
378 | ||
379 | struct biovec_slab { | |
380 | int nr_vecs; | |
381 | char *name; | |
382 | struct kmem_cache *slab; | |
383 | }; | |
384 | ||
385 | extern struct bio_set *fs_bio_set; | |
386 | ||
387 | /* | |
388 | * a small number of entries is fine, not going to be performance critical. | |
389 | * basically we just need to survive | |
390 | */ | |
391 | #define BIO_SPLIT_ENTRIES 2 | |
1da177e4 LT |
392 | |
393 | #ifdef CONFIG_HIGHMEM | |
394 | /* | |
395 | * remember to add offset! and never ever reenable interrupts between a | |
396 | * bvec_kmap_irq and bvec_kunmap_irq!! | |
397 | * | |
398 | * This function MUST be inlined - it plays with the CPU interrupt flags. | |
1da177e4 | 399 | */ |
c2d08dad | 400 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
1da177e4 LT |
401 | { |
402 | unsigned long addr; | |
403 | ||
404 | /* | |
405 | * might not be a highmem page, but the preempt/irq count | |
406 | * balancing is a lot nicer this way | |
407 | */ | |
408 | local_irq_save(*flags); | |
409 | addr = (unsigned long) kmap_atomic(bvec->bv_page, KM_BIO_SRC_IRQ); | |
410 | ||
411 | BUG_ON(addr & ~PAGE_MASK); | |
412 | ||
413 | return (char *) addr + bvec->bv_offset; | |
414 | } | |
415 | ||
c2d08dad | 416 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) |
1da177e4 LT |
417 | { |
418 | unsigned long ptr = (unsigned long) buffer & PAGE_MASK; | |
419 | ||
420 | kunmap_atomic((void *) ptr, KM_BIO_SRC_IRQ); | |
421 | local_irq_restore(*flags); | |
422 | } | |
423 | ||
424 | #else | |
425 | #define bvec_kmap_irq(bvec, flags) (page_address((bvec)->bv_page) + (bvec)->bv_offset) | |
426 | #define bvec_kunmap_irq(buf, flags) do { *(flags) = 0; } while (0) | |
427 | #endif | |
428 | ||
c2d08dad | 429 | static inline char *__bio_kmap_irq(struct bio *bio, unsigned short idx, |
1da177e4 LT |
430 | unsigned long *flags) |
431 | { | |
432 | return bvec_kmap_irq(bio_iovec_idx(bio, idx), flags); | |
433 | } | |
434 | #define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags) | |
435 | ||
436 | #define bio_kmap_irq(bio, flags) \ | |
437 | __bio_kmap_irq((bio), (bio)->bi_idx, (flags)) | |
438 | #define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags) | |
439 | ||
7a67f63b JA |
440 | /* |
441 | * Check whether this bio carries any data or not. A NULL bio is allowed. | |
442 | */ | |
443 | static inline int bio_has_data(struct bio *bio) | |
444 | { | |
445 | return bio && bio->bi_io_vec != NULL; | |
446 | } | |
447 | ||
7ba1ba12 MP |
448 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
449 | ||
450 | #define bip_vec_idx(bip, idx) (&(bip->bip_vec[(idx)])) | |
451 | #define bip_vec(bip) bip_vec_idx(bip, 0) | |
452 | ||
453 | #define __bip_for_each_vec(bvl, bip, i, start_idx) \ | |
454 | for (bvl = bip_vec_idx((bip), (start_idx)), i = (start_idx); \ | |
455 | i < (bip)->bip_vcnt; \ | |
456 | bvl++, i++) | |
457 | ||
458 | #define bip_for_each_vec(bvl, bip, i) \ | |
459 | __bip_for_each_vec(bvl, bip, i, (bip)->bip_idx) | |
460 | ||
8deaf721 | 461 | #define bio_integrity(bio) (bio->bi_integrity != NULL) |
7ba1ba12 MP |
462 | |
463 | extern struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *, gfp_t, unsigned int, struct bio_set *); | |
464 | extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int); | |
465 | extern void bio_integrity_free(struct bio *, struct bio_set *); | |
466 | extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int); | |
467 | extern int bio_integrity_enabled(struct bio *bio); | |
468 | extern int bio_integrity_set_tag(struct bio *, void *, unsigned int); | |
469 | extern int bio_integrity_get_tag(struct bio *, void *, unsigned int); | |
470 | extern int bio_integrity_prep(struct bio *); | |
471 | extern void bio_integrity_endio(struct bio *, int); | |
472 | extern void bio_integrity_advance(struct bio *, unsigned int); | |
473 | extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int); | |
474 | extern void bio_integrity_split(struct bio *, struct bio_pair *, int); | |
475 | extern int bio_integrity_clone(struct bio *, struct bio *, struct bio_set *); | |
476 | extern int bioset_integrity_create(struct bio_set *, int); | |
477 | extern void bioset_integrity_free(struct bio_set *); | |
478 | extern void bio_integrity_init_slab(void); | |
479 | ||
480 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
481 | ||
482 | #define bio_integrity(a) (0) | |
483 | #define bioset_integrity_create(a, b) (0) | |
484 | #define bio_integrity_prep(a) (0) | |
485 | #define bio_integrity_enabled(a) (0) | |
486 | #define bio_integrity_clone(a, b, c) (0) | |
487 | #define bioset_integrity_free(a) do { } while (0) | |
488 | #define bio_integrity_free(a, b) do { } while (0) | |
489 | #define bio_integrity_endio(a, b) do { } while (0) | |
490 | #define bio_integrity_advance(a, b) do { } while (0) | |
491 | #define bio_integrity_trim(a, b, c) do { } while (0) | |
492 | #define bio_integrity_split(a, b, c) do { } while (0) | |
493 | #define bio_integrity_set_tag(a, b, c) do { } while (0) | |
494 | #define bio_integrity_get_tag(a, b, c) do { } while (0) | |
495 | #define bio_integrity_init_slab(a) do { } while (0) | |
496 | ||
497 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
498 | ||
02a5e0ac | 499 | #endif /* CONFIG_BLOCK */ |
1da177e4 | 500 | #endif /* __LINUX_BIO_H */ |