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 */ |
1da177e4 LT |
111 | #define bio_flagged(bio, flag) ((bio)->bi_flags & (1 << (flag))) |
112 | ||
113 | /* | |
114 | * top 4 bits of bio flags indicate the pool this bio came from | |
115 | */ | |
116 | #define BIO_POOL_BITS (4) | |
117 | #define BIO_POOL_OFFSET (BITS_PER_LONG - BIO_POOL_BITS) | |
118 | #define BIO_POOL_MASK (1UL << BIO_POOL_OFFSET) | |
119 | #define BIO_POOL_IDX(bio) ((bio)->bi_flags >> BIO_POOL_OFFSET) | |
120 | ||
121 | /* | |
122 | * bio bi_rw flags | |
123 | * | |
124 | * bit 0 -- read (not set) or write (set) | |
125 | * bit 1 -- rw-ahead when set | |
126 | * bit 2 -- barrier | |
127 | * bit 3 -- fail fast, don't want low level driver retries | |
128 | * bit 4 -- synchronous I/O hint: the block layer will unplug immediately | |
fb2dce86 DW |
129 | * bit 5 -- metadata request |
130 | * bit 6 -- discard sectors | |
1da177e4 | 131 | */ |
d628eaef DW |
132 | #define BIO_RW 0 /* Must match RW in req flags (blkdev.h) */ |
133 | #define BIO_RW_AHEAD 1 /* Must match FAILFAST in req flags */ | |
1da177e4 LT |
134 | #define BIO_RW_BARRIER 2 |
135 | #define BIO_RW_FAILFAST 3 | |
136 | #define BIO_RW_SYNC 4 | |
5404bc7a | 137 | #define BIO_RW_META 5 |
fb2dce86 | 138 | #define BIO_RW_DISCARD 6 |
1da177e4 | 139 | |
22e2c507 JA |
140 | /* |
141 | * upper 16 bits of bi_rw define the io priority of this bio | |
142 | */ | |
143 | #define BIO_PRIO_SHIFT (8 * sizeof(unsigned long) - IOPRIO_BITS) | |
144 | #define bio_prio(bio) ((bio)->bi_rw >> BIO_PRIO_SHIFT) | |
145 | #define bio_prio_valid(bio) ioprio_valid(bio_prio(bio)) | |
146 | ||
147 | #define bio_set_prio(bio, prio) do { \ | |
148 | WARN_ON(prio >= (1 << IOPRIO_BITS)); \ | |
149 | (bio)->bi_rw &= ((1UL << BIO_PRIO_SHIFT) - 1); \ | |
150 | (bio)->bi_rw |= ((unsigned long) (prio) << BIO_PRIO_SHIFT); \ | |
151 | } while (0) | |
152 | ||
1da177e4 LT |
153 | /* |
154 | * various member access, note that bio_data should of course not be used | |
155 | * on highmem page vectors | |
156 | */ | |
157 | #define bio_iovec_idx(bio, idx) (&((bio)->bi_io_vec[(idx)])) | |
158 | #define bio_iovec(bio) bio_iovec_idx((bio), (bio)->bi_idx) | |
159 | #define bio_page(bio) bio_iovec((bio))->bv_page | |
160 | #define bio_offset(bio) bio_iovec((bio))->bv_offset | |
161 | #define bio_segments(bio) ((bio)->bi_vcnt - (bio)->bi_idx) | |
162 | #define bio_sectors(bio) ((bio)->bi_size >> 9) | |
1da177e4 LT |
163 | #define bio_barrier(bio) ((bio)->bi_rw & (1 << BIO_RW_BARRIER)) |
164 | #define bio_sync(bio) ((bio)->bi_rw & (1 << BIO_RW_SYNC)) | |
165 | #define bio_failfast(bio) ((bio)->bi_rw & (1 << BIO_RW_FAILFAST)) | |
166 | #define bio_rw_ahead(bio) ((bio)->bi_rw & (1 << BIO_RW_AHEAD)) | |
5404bc7a | 167 | #define bio_rw_meta(bio) ((bio)->bi_rw & (1 << BIO_RW_META)) |
fb2dce86 | 168 | #define bio_discard(bio) ((bio)->bi_rw & (1 << BIO_RW_DISCARD)) |
e17fc0a1 | 169 | #define bio_empty_barrier(bio) (bio_barrier(bio) && !bio_has_data(bio) && !bio_discard(bio)) |
bf2de6f5 JA |
170 | |
171 | static inline unsigned int bio_cur_sectors(struct bio *bio) | |
172 | { | |
173 | if (bio->bi_vcnt) | |
174 | return bio_iovec(bio)->bv_len >> 9; | |
fb2dce86 DW |
175 | else /* dataless requests such as discard */ |
176 | return bio->bi_size >> 9; | |
bf2de6f5 JA |
177 | } |
178 | ||
179 | static inline void *bio_data(struct bio *bio) | |
180 | { | |
181 | if (bio->bi_vcnt) | |
182 | return page_address(bio_page(bio)) + bio_offset(bio); | |
183 | ||
184 | return NULL; | |
185 | } | |
1da177e4 LT |
186 | |
187 | /* | |
188 | * will die | |
189 | */ | |
190 | #define bio_to_phys(bio) (page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio))) | |
191 | #define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset) | |
192 | ||
193 | /* | |
194 | * queues that have highmem support enabled may still need to revert to | |
195 | * PIO transfers occasionally and thus map high pages temporarily. For | |
196 | * permanent PIO fall back, user is probably better off disabling highmem | |
197 | * I/O completely on that queue (see ide-dma for example) | |
198 | */ | |
199 | #define __bio_kmap_atomic(bio, idx, kmtype) \ | |
200 | (kmap_atomic(bio_iovec_idx((bio), (idx))->bv_page, kmtype) + \ | |
201 | bio_iovec_idx((bio), (idx))->bv_offset) | |
202 | ||
203 | #define __bio_kunmap_atomic(addr, kmtype) kunmap_atomic(addr, kmtype) | |
204 | ||
205 | /* | |
206 | * merge helpers etc | |
207 | */ | |
208 | ||
209 | #define __BVEC_END(bio) bio_iovec_idx((bio), (bio)->bi_vcnt - 1) | |
210 | #define __BVEC_START(bio) bio_iovec_idx((bio), (bio)->bi_idx) | |
211 | ||
212 | /* | |
213 | * allow arch override, for eg virtualized architectures (put in asm/io.h) | |
214 | */ | |
215 | #ifndef BIOVEC_PHYS_MERGEABLE | |
216 | #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ | |
217 | ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2))) | |
218 | #endif | |
219 | ||
1da177e4 LT |
220 | #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \ |
221 | (((addr1) | (mask)) == (((addr2) - 1) | (mask))) | |
222 | #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \ | |
223 | __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, (q)->seg_boundary_mask) | |
224 | #define BIO_SEG_BOUNDARY(q, b1, b2) \ | |
225 | BIOVEC_SEG_BOUNDARY((q), __BVEC_END((b1)), __BVEC_START((b2))) | |
226 | ||
6712ecf8 | 227 | #define bio_io_error(bio) bio_endio((bio), -EIO) |
1da177e4 LT |
228 | |
229 | /* | |
230 | * drivers should not use the __ version unless they _really_ want to | |
231 | * run through the entire bio and not just pending pieces | |
232 | */ | |
233 | #define __bio_for_each_segment(bvl, bio, i, start_idx) \ | |
234 | for (bvl = bio_iovec_idx((bio), (start_idx)), i = (start_idx); \ | |
235 | i < (bio)->bi_vcnt; \ | |
236 | bvl++, i++) | |
237 | ||
238 | #define bio_for_each_segment(bvl, bio, i) \ | |
239 | __bio_for_each_segment(bvl, bio, i, (bio)->bi_idx) | |
240 | ||
241 | /* | |
242 | * get a reference to a bio, so it won't disappear. the intended use is | |
243 | * something like: | |
244 | * | |
245 | * bio_get(bio); | |
246 | * submit_bio(rw, bio); | |
247 | * if (bio->bi_flags ...) | |
248 | * do_something | |
249 | * bio_put(bio); | |
250 | * | |
251 | * without the bio_get(), it could potentially complete I/O before submit_bio | |
252 | * returns. and then bio would be freed memory when if (bio->bi_flags ...) | |
253 | * runs | |
254 | */ | |
255 | #define bio_get(bio) atomic_inc(&(bio)->bi_cnt) | |
256 | ||
7ba1ba12 MP |
257 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
258 | /* | |
259 | * bio integrity payload | |
260 | */ | |
261 | struct bio_integrity_payload { | |
262 | struct bio *bip_bio; /* parent bio */ | |
263 | struct bio_vec *bip_vec; /* integrity data vector */ | |
264 | ||
265 | sector_t bip_sector; /* virtual start sector */ | |
266 | ||
267 | void *bip_buf; /* generated integrity data */ | |
268 | bio_end_io_t *bip_end_io; /* saved I/O completion fn */ | |
269 | ||
270 | int bip_error; /* saved I/O error */ | |
271 | unsigned int bip_size; | |
272 | ||
273 | unsigned short bip_pool; /* pool the ivec came from */ | |
274 | unsigned short bip_vcnt; /* # of integrity bio_vecs */ | |
275 | unsigned short bip_idx; /* current bip_vec index */ | |
276 | ||
277 | struct work_struct bip_work; /* I/O completion */ | |
278 | }; | |
279 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1da177e4 LT |
280 | |
281 | /* | |
282 | * A bio_pair is used when we need to split a bio. | |
283 | * This can only happen for a bio that refers to just one | |
284 | * page of data, and in the unusual situation when the | |
285 | * page crosses a chunk/device boundary | |
286 | * | |
287 | * The address of the master bio is stored in bio1.bi_private | |
288 | * The address of the pool the pair was allocated from is stored | |
289 | * in bio2.bi_private | |
290 | */ | |
291 | struct bio_pair { | |
7ba1ba12 MP |
292 | struct bio bio1, bio2; |
293 | struct bio_vec bv1, bv2; | |
294 | #if defined(CONFIG_BLK_DEV_INTEGRITY) | |
295 | struct bio_integrity_payload bip1, bip2; | |
296 | struct bio_vec iv1, iv2; | |
297 | #endif | |
298 | atomic_t cnt; | |
299 | int error; | |
1da177e4 LT |
300 | }; |
301 | extern struct bio_pair *bio_split(struct bio *bi, mempool_t *pool, | |
302 | int first_sectors); | |
303 | extern mempool_t *bio_split_pool; | |
304 | extern void bio_pair_release(struct bio_pair *dbio); | |
305 | ||
5972511b | 306 | extern struct bio_set *bioset_create(int, int); |
1da177e4 LT |
307 | extern void bioset_free(struct bio_set *); |
308 | ||
dd0fc66f AV |
309 | extern struct bio *bio_alloc(gfp_t, int); |
310 | extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *); | |
1da177e4 | 311 | extern void bio_put(struct bio *); |
3676347a | 312 | extern void bio_free(struct bio *, struct bio_set *); |
1da177e4 | 313 | |
6712ecf8 | 314 | extern void bio_endio(struct bio *, int); |
1da177e4 LT |
315 | struct request_queue; |
316 | extern int bio_phys_segments(struct request_queue *, struct bio *); | |
1da177e4 LT |
317 | |
318 | extern void __bio_clone(struct bio *, struct bio *); | |
dd0fc66f | 319 | extern struct bio *bio_clone(struct bio *, gfp_t); |
1da177e4 LT |
320 | |
321 | extern void bio_init(struct bio *); | |
322 | ||
323 | extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int); | |
6e68af66 MC |
324 | extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *, |
325 | unsigned int, unsigned int); | |
1da177e4 LT |
326 | extern int bio_get_nr_vecs(struct block_device *); |
327 | extern struct bio *bio_map_user(struct request_queue *, struct block_device *, | |
328 | unsigned long, unsigned int, int); | |
f1970baf JB |
329 | struct sg_iovec; |
330 | extern struct bio *bio_map_user_iov(struct request_queue *, | |
331 | struct block_device *, | |
332 | struct sg_iovec *, int, int); | |
1da177e4 | 333 | extern void bio_unmap_user(struct bio *); |
df46b9a4 | 334 | extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int, |
27496a8c | 335 | gfp_t); |
68154e90 FT |
336 | extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int, |
337 | gfp_t, int); | |
1da177e4 LT |
338 | extern void bio_set_pages_dirty(struct bio *bio); |
339 | extern void bio_check_pages_dirty(struct bio *bio); | |
340 | extern struct bio *bio_copy_user(struct request_queue *, unsigned long, unsigned int, int); | |
c5dec1c3 FT |
341 | extern struct bio *bio_copy_user_iov(struct request_queue *, struct sg_iovec *, |
342 | int, int); | |
1da177e4 LT |
343 | extern int bio_uncopy_user(struct bio *); |
344 | void zero_fill_bio(struct bio *bio); | |
51d654e1 | 345 | extern struct bio_vec *bvec_alloc_bs(gfp_t, int, unsigned long *, struct bio_set *); |
7ba1ba12 | 346 | extern unsigned int bvec_nr_vecs(unsigned short idx); |
51d654e1 | 347 | |
c7c22e4d JA |
348 | /* |
349 | * Allow queuer to specify a completion CPU for this bio | |
350 | */ | |
351 | static inline void bio_set_completion_cpu(struct bio *bio, unsigned int cpu) | |
352 | { | |
353 | bio->bi_comp_cpu = cpu; | |
354 | } | |
355 | ||
51d654e1 MP |
356 | /* |
357 | * bio_set is used to allow other portions of the IO system to | |
358 | * allocate their own private memory pools for bio and iovec structures. | |
359 | * These memory pools in turn all allocate from the bio_slab | |
360 | * and the bvec_slabs[]. | |
361 | */ | |
362 | #define BIO_POOL_SIZE 2 | |
363 | #define BIOVEC_NR_POOLS 6 | |
364 | ||
365 | struct bio_set { | |
366 | mempool_t *bio_pool; | |
7ba1ba12 MP |
367 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
368 | mempool_t *bio_integrity_pool; | |
369 | #endif | |
51d654e1 MP |
370 | mempool_t *bvec_pools[BIOVEC_NR_POOLS]; |
371 | }; | |
372 | ||
373 | struct biovec_slab { | |
374 | int nr_vecs; | |
375 | char *name; | |
376 | struct kmem_cache *slab; | |
377 | }; | |
378 | ||
379 | extern struct bio_set *fs_bio_set; | |
380 | ||
381 | /* | |
382 | * a small number of entries is fine, not going to be performance critical. | |
383 | * basically we just need to survive | |
384 | */ | |
385 | #define BIO_SPLIT_ENTRIES 2 | |
1da177e4 LT |
386 | |
387 | #ifdef CONFIG_HIGHMEM | |
388 | /* | |
389 | * remember to add offset! and never ever reenable interrupts between a | |
390 | * bvec_kmap_irq and bvec_kunmap_irq!! | |
391 | * | |
392 | * This function MUST be inlined - it plays with the CPU interrupt flags. | |
1da177e4 | 393 | */ |
c2d08dad | 394 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
1da177e4 LT |
395 | { |
396 | unsigned long addr; | |
397 | ||
398 | /* | |
399 | * might not be a highmem page, but the preempt/irq count | |
400 | * balancing is a lot nicer this way | |
401 | */ | |
402 | local_irq_save(*flags); | |
403 | addr = (unsigned long) kmap_atomic(bvec->bv_page, KM_BIO_SRC_IRQ); | |
404 | ||
405 | BUG_ON(addr & ~PAGE_MASK); | |
406 | ||
407 | return (char *) addr + bvec->bv_offset; | |
408 | } | |
409 | ||
c2d08dad | 410 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) |
1da177e4 LT |
411 | { |
412 | unsigned long ptr = (unsigned long) buffer & PAGE_MASK; | |
413 | ||
414 | kunmap_atomic((void *) ptr, KM_BIO_SRC_IRQ); | |
415 | local_irq_restore(*flags); | |
416 | } | |
417 | ||
418 | #else | |
419 | #define bvec_kmap_irq(bvec, flags) (page_address((bvec)->bv_page) + (bvec)->bv_offset) | |
420 | #define bvec_kunmap_irq(buf, flags) do { *(flags) = 0; } while (0) | |
421 | #endif | |
422 | ||
c2d08dad | 423 | static inline char *__bio_kmap_irq(struct bio *bio, unsigned short idx, |
1da177e4 LT |
424 | unsigned long *flags) |
425 | { | |
426 | return bvec_kmap_irq(bio_iovec_idx(bio, idx), flags); | |
427 | } | |
428 | #define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags) | |
429 | ||
430 | #define bio_kmap_irq(bio, flags) \ | |
431 | __bio_kmap_irq((bio), (bio)->bi_idx, (flags)) | |
432 | #define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags) | |
433 | ||
7a67f63b JA |
434 | /* |
435 | * Check whether this bio carries any data or not. A NULL bio is allowed. | |
436 | */ | |
437 | static inline int bio_has_data(struct bio *bio) | |
438 | { | |
439 | return bio && bio->bi_io_vec != NULL; | |
440 | } | |
441 | ||
7ba1ba12 MP |
442 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
443 | ||
444 | #define bip_vec_idx(bip, idx) (&(bip->bip_vec[(idx)])) | |
445 | #define bip_vec(bip) bip_vec_idx(bip, 0) | |
446 | ||
447 | #define __bip_for_each_vec(bvl, bip, i, start_idx) \ | |
448 | for (bvl = bip_vec_idx((bip), (start_idx)), i = (start_idx); \ | |
449 | i < (bip)->bip_vcnt; \ | |
450 | bvl++, i++) | |
451 | ||
452 | #define bip_for_each_vec(bvl, bip, i) \ | |
453 | __bip_for_each_vec(bvl, bip, i, (bip)->bip_idx) | |
454 | ||
6e2401ad JA |
455 | static inline int bio_integrity(struct bio *bio) |
456 | { | |
457 | #if defined(CONFIG_BLK_DEV_INTEGRITY) | |
458 | return bio->bi_integrity != NULL; | |
459 | #else | |
460 | return 0; | |
461 | #endif | |
462 | } | |
7ba1ba12 MP |
463 | |
464 | extern struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *, gfp_t, unsigned int, struct bio_set *); | |
465 | extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int); | |
466 | extern void bio_integrity_free(struct bio *, struct bio_set *); | |
467 | extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int); | |
468 | extern int bio_integrity_enabled(struct bio *bio); | |
469 | extern int bio_integrity_set_tag(struct bio *, void *, unsigned int); | |
470 | extern int bio_integrity_get_tag(struct bio *, void *, unsigned int); | |
471 | extern int bio_integrity_prep(struct bio *); | |
472 | extern void bio_integrity_endio(struct bio *, int); | |
473 | extern void bio_integrity_advance(struct bio *, unsigned int); | |
474 | extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int); | |
475 | extern void bio_integrity_split(struct bio *, struct bio_pair *, int); | |
476 | extern int bio_integrity_clone(struct bio *, struct bio *, struct bio_set *); | |
477 | extern int bioset_integrity_create(struct bio_set *, int); | |
478 | extern void bioset_integrity_free(struct bio_set *); | |
479 | extern void bio_integrity_init_slab(void); | |
480 | ||
481 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
482 | ||
483 | #define bio_integrity(a) (0) | |
484 | #define bioset_integrity_create(a, b) (0) | |
485 | #define bio_integrity_prep(a) (0) | |
486 | #define bio_integrity_enabled(a) (0) | |
487 | #define bio_integrity_clone(a, b, c) (0) | |
488 | #define bioset_integrity_free(a) do { } while (0) | |
489 | #define bio_integrity_free(a, b) do { } while (0) | |
490 | #define bio_integrity_endio(a, b) do { } while (0) | |
491 | #define bio_integrity_advance(a, b) do { } while (0) | |
492 | #define bio_integrity_trim(a, b, c) do { } while (0) | |
493 | #define bio_integrity_split(a, b, c) do { } while (0) | |
494 | #define bio_integrity_set_tag(a, b, c) do { } while (0) | |
495 | #define bio_integrity_get_tag(a, b, c) do { } while (0) | |
496 | #define bio_integrity_init_slab(a) do { } while (0) | |
497 | ||
498 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
499 | ||
02a5e0ac | 500 | #endif /* CONFIG_BLOCK */ |
1da177e4 | 501 | #endif /* __LINUX_BIO_H */ |