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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 | |
7cc01581 | 12 | * |
1da177e4 LT |
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> |
187f1882 | 26 | #include <linux/bug.h> |
1da177e4 | 27 | |
02a5e0ac DH |
28 | #ifdef CONFIG_BLOCK |
29 | ||
1da177e4 LT |
30 | #include <asm/io.h> |
31 | ||
7cc01581 TH |
32 | /* struct bio, bio_vec and BIO_* flags are defined in blk_types.h */ |
33 | #include <linux/blk_types.h> | |
34 | ||
1da177e4 LT |
35 | #define BIO_DEBUG |
36 | ||
37 | #ifdef BIO_DEBUG | |
38 | #define BIO_BUG_ON BUG_ON | |
39 | #else | |
40 | #define BIO_BUG_ON | |
41 | #endif | |
42 | ||
d84a8477 | 43 | #define BIO_MAX_PAGES 256 |
1da177e4 LT |
44 | #define BIO_MAX_SIZE (BIO_MAX_PAGES << PAGE_CACHE_SHIFT) |
45 | #define BIO_MAX_SECTORS (BIO_MAX_SIZE >> 9) | |
46 | ||
22e2c507 JA |
47 | /* |
48 | * upper 16 bits of bi_rw define the io priority of this bio | |
49 | */ | |
50 | #define BIO_PRIO_SHIFT (8 * sizeof(unsigned long) - IOPRIO_BITS) | |
51 | #define bio_prio(bio) ((bio)->bi_rw >> BIO_PRIO_SHIFT) | |
52 | #define bio_prio_valid(bio) ioprio_valid(bio_prio(bio)) | |
53 | ||
54 | #define bio_set_prio(bio, prio) do { \ | |
55 | WARN_ON(prio >= (1 << IOPRIO_BITS)); \ | |
56 | (bio)->bi_rw &= ((1UL << BIO_PRIO_SHIFT) - 1); \ | |
57 | (bio)->bi_rw |= ((unsigned long) (prio) << BIO_PRIO_SHIFT); \ | |
58 | } while (0) | |
59 | ||
1da177e4 LT |
60 | /* |
61 | * various member access, note that bio_data should of course not be used | |
62 | * on highmem page vectors | |
63 | */ | |
64 | #define bio_iovec_idx(bio, idx) (&((bio)->bi_io_vec[(idx)])) | |
65 | #define bio_iovec(bio) bio_iovec_idx((bio), (bio)->bi_idx) | |
66 | #define bio_page(bio) bio_iovec((bio))->bv_page | |
67 | #define bio_offset(bio) bio_iovec((bio))->bv_offset | |
68 | #define bio_segments(bio) ((bio)->bi_vcnt - (bio)->bi_idx) | |
69 | #define bio_sectors(bio) ((bio)->bi_size >> 9) | |
f73a1c7d | 70 | #define bio_end_sector(bio) ((bio)->bi_sector + bio_sectors((bio))) |
bf2de6f5 | 71 | |
2e46e8b2 | 72 | static inline unsigned int bio_cur_bytes(struct bio *bio) |
bf2de6f5 JA |
73 | { |
74 | if (bio->bi_vcnt) | |
2e46e8b2 | 75 | return bio_iovec(bio)->bv_len; |
fb2dce86 | 76 | else /* dataless requests such as discard */ |
2e46e8b2 | 77 | return bio->bi_size; |
bf2de6f5 JA |
78 | } |
79 | ||
80 | static inline void *bio_data(struct bio *bio) | |
81 | { | |
82 | if (bio->bi_vcnt) | |
83 | return page_address(bio_page(bio)) + bio_offset(bio); | |
84 | ||
85 | return NULL; | |
86 | } | |
1da177e4 | 87 | |
392ddc32 JA |
88 | static inline int bio_has_allocated_vec(struct bio *bio) |
89 | { | |
90 | return bio->bi_io_vec && bio->bi_io_vec != bio->bi_inline_vecs; | |
91 | } | |
92 | ||
1da177e4 LT |
93 | /* |
94 | * will die | |
95 | */ | |
96 | #define bio_to_phys(bio) (page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio))) | |
97 | #define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset) | |
98 | ||
99 | /* | |
100 | * queues that have highmem support enabled may still need to revert to | |
101 | * PIO transfers occasionally and thus map high pages temporarily. For | |
102 | * permanent PIO fall back, user is probably better off disabling highmem | |
103 | * I/O completely on that queue (see ide-dma for example) | |
104 | */ | |
105 | #define __bio_kmap_atomic(bio, idx, kmtype) \ | |
e8e3c3d6 | 106 | (kmap_atomic(bio_iovec_idx((bio), (idx))->bv_page) + \ |
1da177e4 LT |
107 | bio_iovec_idx((bio), (idx))->bv_offset) |
108 | ||
e8e3c3d6 | 109 | #define __bio_kunmap_atomic(addr, kmtype) kunmap_atomic(addr) |
1da177e4 LT |
110 | |
111 | /* | |
112 | * merge helpers etc | |
113 | */ | |
114 | ||
115 | #define __BVEC_END(bio) bio_iovec_idx((bio), (bio)->bi_vcnt - 1) | |
116 | #define __BVEC_START(bio) bio_iovec_idx((bio), (bio)->bi_idx) | |
117 | ||
f92131c3 JF |
118 | /* Default implementation of BIOVEC_PHYS_MERGEABLE */ |
119 | #define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ | |
120 | ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2))) | |
121 | ||
1da177e4 LT |
122 | /* |
123 | * allow arch override, for eg virtualized architectures (put in asm/io.h) | |
124 | */ | |
125 | #ifndef BIOVEC_PHYS_MERGEABLE | |
126 | #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ | |
f92131c3 | 127 | __BIOVEC_PHYS_MERGEABLE(vec1, vec2) |
1da177e4 LT |
128 | #endif |
129 | ||
1da177e4 LT |
130 | #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \ |
131 | (((addr1) | (mask)) == (((addr2) - 1) | (mask))) | |
132 | #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \ | |
ae03bf63 | 133 | __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q))) |
1da177e4 LT |
134 | #define BIO_SEG_BOUNDARY(q, b1, b2) \ |
135 | BIOVEC_SEG_BOUNDARY((q), __BVEC_END((b1)), __BVEC_START((b2))) | |
136 | ||
6712ecf8 | 137 | #define bio_io_error(bio) bio_endio((bio), -EIO) |
1da177e4 LT |
138 | |
139 | /* | |
140 | * drivers should not use the __ version unless they _really_ want to | |
141 | * run through the entire bio and not just pending pieces | |
142 | */ | |
143 | #define __bio_for_each_segment(bvl, bio, i, start_idx) \ | |
144 | for (bvl = bio_iovec_idx((bio), (start_idx)), i = (start_idx); \ | |
145 | i < (bio)->bi_vcnt; \ | |
146 | bvl++, i++) | |
147 | ||
148 | #define bio_for_each_segment(bvl, bio, i) \ | |
149 | __bio_for_each_segment(bvl, bio, i, (bio)->bi_idx) | |
150 | ||
151 | /* | |
152 | * get a reference to a bio, so it won't disappear. the intended use is | |
153 | * something like: | |
154 | * | |
155 | * bio_get(bio); | |
156 | * submit_bio(rw, bio); | |
157 | * if (bio->bi_flags ...) | |
158 | * do_something | |
159 | * bio_put(bio); | |
160 | * | |
161 | * without the bio_get(), it could potentially complete I/O before submit_bio | |
162 | * returns. and then bio would be freed memory when if (bio->bi_flags ...) | |
163 | * runs | |
164 | */ | |
165 | #define bio_get(bio) atomic_inc(&(bio)->bi_cnt) | |
166 | ||
7ba1ba12 MP |
167 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
168 | /* | |
169 | * bio integrity payload | |
170 | */ | |
171 | struct bio_integrity_payload { | |
172 | struct bio *bip_bio; /* parent bio */ | |
7ba1ba12 MP |
173 | |
174 | sector_t bip_sector; /* virtual start sector */ | |
175 | ||
176 | void *bip_buf; /* generated integrity data */ | |
177 | bio_end_io_t *bip_end_io; /* saved I/O completion fn */ | |
178 | ||
7ba1ba12 MP |
179 | unsigned int bip_size; |
180 | ||
7878cba9 | 181 | unsigned short bip_slab; /* slab the bip came from */ |
7ba1ba12 MP |
182 | unsigned short bip_vcnt; /* # of integrity bio_vecs */ |
183 | unsigned short bip_idx; /* current bip_vec index */ | |
184 | ||
185 | struct work_struct bip_work; /* I/O completion */ | |
6fda981c KO |
186 | |
187 | struct bio_vec *bip_vec; | |
188 | struct bio_vec bip_inline_vecs[0];/* embedded bvec array */ | |
7ba1ba12 MP |
189 | }; |
190 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1da177e4 LT |
191 | |
192 | /* | |
193 | * A bio_pair is used when we need to split a bio. | |
194 | * This can only happen for a bio that refers to just one | |
195 | * page of data, and in the unusual situation when the | |
196 | * page crosses a chunk/device boundary | |
197 | * | |
198 | * The address of the master bio is stored in bio1.bi_private | |
199 | * The address of the pool the pair was allocated from is stored | |
200 | * in bio2.bi_private | |
201 | */ | |
202 | struct bio_pair { | |
7ba1ba12 MP |
203 | struct bio bio1, bio2; |
204 | struct bio_vec bv1, bv2; | |
205 | #if defined(CONFIG_BLK_DEV_INTEGRITY) | |
206 | struct bio_integrity_payload bip1, bip2; | |
207 | struct bio_vec iv1, iv2; | |
208 | #endif | |
209 | atomic_t cnt; | |
210 | int error; | |
1da177e4 | 211 | }; |
6feef531 | 212 | extern struct bio_pair *bio_split(struct bio *bi, int first_sectors); |
1da177e4 LT |
213 | extern void bio_pair_release(struct bio_pair *dbio); |
214 | ||
bb799ca0 | 215 | extern struct bio_set *bioset_create(unsigned int, unsigned int); |
1da177e4 | 216 | extern void bioset_free(struct bio_set *); |
9f060e22 | 217 | extern mempool_t *biovec_create_pool(struct bio_set *bs, int pool_entries); |
1da177e4 | 218 | |
dd0fc66f | 219 | extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *); |
1da177e4 LT |
220 | extern void bio_put(struct bio *); |
221 | ||
bf800ef1 KO |
222 | extern void __bio_clone(struct bio *, struct bio *); |
223 | extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs); | |
224 | ||
3f86a82a KO |
225 | extern struct bio_set *fs_bio_set; |
226 | ||
227 | static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) | |
228 | { | |
229 | return bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set); | |
230 | } | |
231 | ||
bf800ef1 KO |
232 | static inline struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask) |
233 | { | |
234 | return bio_clone_bioset(bio, gfp_mask, fs_bio_set); | |
235 | } | |
236 | ||
3f86a82a KO |
237 | static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs) |
238 | { | |
239 | return bio_alloc_bioset(gfp_mask, nr_iovecs, NULL); | |
240 | } | |
241 | ||
bf800ef1 KO |
242 | static inline struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask) |
243 | { | |
244 | return bio_clone_bioset(bio, gfp_mask, NULL); | |
245 | ||
246 | } | |
247 | ||
6712ecf8 | 248 | extern void bio_endio(struct bio *, int); |
1da177e4 LT |
249 | struct request_queue; |
250 | extern int bio_phys_segments(struct request_queue *, struct bio *); | |
1da177e4 | 251 | |
9e882242 | 252 | extern int submit_bio_wait(int rw, struct bio *bio); |
054bdf64 KO |
253 | extern void bio_advance(struct bio *, unsigned); |
254 | ||
1da177e4 | 255 | extern void bio_init(struct bio *); |
f44b48c7 | 256 | extern void bio_reset(struct bio *); |
1da177e4 LT |
257 | |
258 | extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int); | |
6e68af66 MC |
259 | extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *, |
260 | unsigned int, unsigned int); | |
1da177e4 | 261 | extern int bio_get_nr_vecs(struct block_device *); |
ad3316bf | 262 | extern sector_t bio_sector_offset(struct bio *, unsigned short, unsigned int); |
1da177e4 | 263 | extern struct bio *bio_map_user(struct request_queue *, struct block_device *, |
a3bce90e | 264 | unsigned long, unsigned int, int, gfp_t); |
f1970baf | 265 | struct sg_iovec; |
152e283f | 266 | struct rq_map_data; |
f1970baf JB |
267 | extern struct bio *bio_map_user_iov(struct request_queue *, |
268 | struct block_device *, | |
a3bce90e | 269 | struct sg_iovec *, int, int, gfp_t); |
1da177e4 | 270 | extern void bio_unmap_user(struct bio *); |
df46b9a4 | 271 | extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int, |
27496a8c | 272 | gfp_t); |
68154e90 FT |
273 | extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int, |
274 | gfp_t, int); | |
1da177e4 LT |
275 | extern void bio_set_pages_dirty(struct bio *bio); |
276 | extern void bio_check_pages_dirty(struct bio *bio); | |
2d4dc890 IL |
277 | |
278 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
279 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
280 | #endif | |
281 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
282 | extern void bio_flush_dcache_pages(struct bio *bi); | |
283 | #else | |
284 | static inline void bio_flush_dcache_pages(struct bio *bi) | |
285 | { | |
286 | } | |
287 | #endif | |
288 | ||
16ac3d63 KO |
289 | extern void bio_copy_data(struct bio *dst, struct bio *src); |
290 | ||
152e283f FT |
291 | extern struct bio *bio_copy_user(struct request_queue *, struct rq_map_data *, |
292 | unsigned long, unsigned int, int, gfp_t); | |
293 | extern struct bio *bio_copy_user_iov(struct request_queue *, | |
294 | struct rq_map_data *, struct sg_iovec *, | |
a3bce90e | 295 | int, int, gfp_t); |
1da177e4 LT |
296 | extern int bio_uncopy_user(struct bio *); |
297 | void zero_fill_bio(struct bio *bio); | |
9f060e22 KO |
298 | extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *); |
299 | extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int); | |
7ba1ba12 | 300 | extern unsigned int bvec_nr_vecs(unsigned short idx); |
51d654e1 | 301 | |
852c788f TH |
302 | #ifdef CONFIG_BLK_CGROUP |
303 | int bio_associate_current(struct bio *bio); | |
304 | void bio_disassociate_task(struct bio *bio); | |
305 | #else /* CONFIG_BLK_CGROUP */ | |
306 | static inline int bio_associate_current(struct bio *bio) { return -ENOENT; } | |
307 | static inline void bio_disassociate_task(struct bio *bio) { } | |
308 | #endif /* CONFIG_BLK_CGROUP */ | |
309 | ||
1da177e4 LT |
310 | #ifdef CONFIG_HIGHMEM |
311 | /* | |
20b636bf AB |
312 | * remember never ever reenable interrupts between a bvec_kmap_irq and |
313 | * bvec_kunmap_irq! | |
1da177e4 | 314 | */ |
4f570f99 | 315 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
1da177e4 LT |
316 | { |
317 | unsigned long addr; | |
318 | ||
319 | /* | |
320 | * might not be a highmem page, but the preempt/irq count | |
321 | * balancing is a lot nicer this way | |
322 | */ | |
323 | local_irq_save(*flags); | |
e8e3c3d6 | 324 | addr = (unsigned long) kmap_atomic(bvec->bv_page); |
1da177e4 LT |
325 | |
326 | BUG_ON(addr & ~PAGE_MASK); | |
327 | ||
328 | return (char *) addr + bvec->bv_offset; | |
329 | } | |
330 | ||
4f570f99 | 331 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) |
1da177e4 LT |
332 | { |
333 | unsigned long ptr = (unsigned long) buffer & PAGE_MASK; | |
334 | ||
e8e3c3d6 | 335 | kunmap_atomic((void *) ptr); |
1da177e4 LT |
336 | local_irq_restore(*flags); |
337 | } | |
338 | ||
339 | #else | |
11a691be GU |
340 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
341 | { | |
342 | return page_address(bvec->bv_page) + bvec->bv_offset; | |
343 | } | |
344 | ||
345 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) | |
346 | { | |
347 | *flags = 0; | |
348 | } | |
1da177e4 LT |
349 | #endif |
350 | ||
c2d08dad | 351 | static inline char *__bio_kmap_irq(struct bio *bio, unsigned short idx, |
1da177e4 LT |
352 | unsigned long *flags) |
353 | { | |
354 | return bvec_kmap_irq(bio_iovec_idx(bio, idx), flags); | |
355 | } | |
356 | #define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags) | |
357 | ||
358 | #define bio_kmap_irq(bio, flags) \ | |
359 | __bio_kmap_irq((bio), (bio)->bi_idx, (flags)) | |
360 | #define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags) | |
361 | ||
7a67f63b JA |
362 | /* |
363 | * Check whether this bio carries any data or not. A NULL bio is allowed. | |
364 | */ | |
e2a60da7 | 365 | static inline bool bio_has_data(struct bio *bio) |
7a67f63b | 366 | { |
e2a60da7 MP |
367 | if (bio && bio->bi_vcnt) |
368 | return true; | |
369 | ||
370 | return false; | |
371 | } | |
372 | ||
373 | static inline bool bio_is_rw(struct bio *bio) | |
374 | { | |
375 | if (!bio_has_data(bio)) | |
376 | return false; | |
377 | ||
4363ac7c MP |
378 | if (bio->bi_rw & REQ_WRITE_SAME) |
379 | return false; | |
380 | ||
e2a60da7 MP |
381 | return true; |
382 | } | |
383 | ||
384 | static inline bool bio_mergeable(struct bio *bio) | |
385 | { | |
386 | if (bio->bi_rw & REQ_NOMERGE_FLAGS) | |
387 | return false; | |
388 | ||
389 | return true; | |
7a67f63b JA |
390 | } |
391 | ||
8f3d8ba2 | 392 | /* |
e686307f | 393 | * BIO list management for use by remapping drivers (e.g. DM or MD) and loop. |
8f3d8ba2 CH |
394 | * |
395 | * A bio_list anchors a singly-linked list of bios chained through the bi_next | |
396 | * member of the bio. The bio_list also caches the last list member to allow | |
397 | * fast access to the tail. | |
398 | */ | |
399 | struct bio_list { | |
400 | struct bio *head; | |
401 | struct bio *tail; | |
402 | }; | |
403 | ||
404 | static inline int bio_list_empty(const struct bio_list *bl) | |
405 | { | |
406 | return bl->head == NULL; | |
407 | } | |
408 | ||
409 | static inline void bio_list_init(struct bio_list *bl) | |
410 | { | |
411 | bl->head = bl->tail = NULL; | |
412 | } | |
413 | ||
414 | #define bio_list_for_each(bio, bl) \ | |
415 | for (bio = (bl)->head; bio; bio = bio->bi_next) | |
416 | ||
417 | static inline unsigned bio_list_size(const struct bio_list *bl) | |
418 | { | |
419 | unsigned sz = 0; | |
420 | struct bio *bio; | |
421 | ||
422 | bio_list_for_each(bio, bl) | |
423 | sz++; | |
424 | ||
425 | return sz; | |
426 | } | |
427 | ||
428 | static inline void bio_list_add(struct bio_list *bl, struct bio *bio) | |
429 | { | |
430 | bio->bi_next = NULL; | |
431 | ||
432 | if (bl->tail) | |
433 | bl->tail->bi_next = bio; | |
434 | else | |
435 | bl->head = bio; | |
436 | ||
437 | bl->tail = bio; | |
438 | } | |
439 | ||
440 | static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio) | |
441 | { | |
442 | bio->bi_next = bl->head; | |
443 | ||
444 | bl->head = bio; | |
445 | ||
446 | if (!bl->tail) | |
447 | bl->tail = bio; | |
448 | } | |
449 | ||
450 | static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2) | |
451 | { | |
452 | if (!bl2->head) | |
453 | return; | |
454 | ||
455 | if (bl->tail) | |
456 | bl->tail->bi_next = bl2->head; | |
457 | else | |
458 | bl->head = bl2->head; | |
459 | ||
460 | bl->tail = bl2->tail; | |
461 | } | |
462 | ||
463 | static inline void bio_list_merge_head(struct bio_list *bl, | |
464 | struct bio_list *bl2) | |
465 | { | |
466 | if (!bl2->head) | |
467 | return; | |
468 | ||
469 | if (bl->head) | |
470 | bl2->tail->bi_next = bl->head; | |
471 | else | |
472 | bl->tail = bl2->tail; | |
473 | ||
474 | bl->head = bl2->head; | |
475 | } | |
476 | ||
13685a16 GU |
477 | static inline struct bio *bio_list_peek(struct bio_list *bl) |
478 | { | |
479 | return bl->head; | |
480 | } | |
481 | ||
8f3d8ba2 CH |
482 | static inline struct bio *bio_list_pop(struct bio_list *bl) |
483 | { | |
484 | struct bio *bio = bl->head; | |
485 | ||
486 | if (bio) { | |
487 | bl->head = bl->head->bi_next; | |
488 | if (!bl->head) | |
489 | bl->tail = NULL; | |
490 | ||
491 | bio->bi_next = NULL; | |
492 | } | |
493 | ||
494 | return bio; | |
495 | } | |
496 | ||
497 | static inline struct bio *bio_list_get(struct bio_list *bl) | |
498 | { | |
499 | struct bio *bio = bl->head; | |
500 | ||
501 | bl->head = bl->tail = NULL; | |
502 | ||
503 | return bio; | |
504 | } | |
505 | ||
57fb233f KO |
506 | /* |
507 | * bio_set is used to allow other portions of the IO system to | |
508 | * allocate their own private memory pools for bio and iovec structures. | |
509 | * These memory pools in turn all allocate from the bio_slab | |
510 | * and the bvec_slabs[]. | |
511 | */ | |
512 | #define BIO_POOL_SIZE 2 | |
513 | #define BIOVEC_NR_POOLS 6 | |
514 | #define BIOVEC_MAX_IDX (BIOVEC_NR_POOLS - 1) | |
515 | ||
516 | struct bio_set { | |
517 | struct kmem_cache *bio_slab; | |
518 | unsigned int front_pad; | |
519 | ||
520 | mempool_t *bio_pool; | |
9f060e22 | 521 | mempool_t *bvec_pool; |
57fb233f KO |
522 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
523 | mempool_t *bio_integrity_pool; | |
9f060e22 | 524 | mempool_t *bvec_integrity_pool; |
57fb233f | 525 | #endif |
df2cb6da KO |
526 | |
527 | /* | |
528 | * Deadlock avoidance for stacking block drivers: see comments in | |
529 | * bio_alloc_bioset() for details | |
530 | */ | |
531 | spinlock_t rescue_lock; | |
532 | struct bio_list rescue_list; | |
533 | struct work_struct rescue_work; | |
534 | struct workqueue_struct *rescue_workqueue; | |
57fb233f KO |
535 | }; |
536 | ||
537 | struct biovec_slab { | |
538 | int nr_vecs; | |
539 | char *name; | |
540 | struct kmem_cache *slab; | |
541 | }; | |
542 | ||
543 | /* | |
544 | * a small number of entries is fine, not going to be performance critical. | |
545 | * basically we just need to survive | |
546 | */ | |
547 | #define BIO_SPLIT_ENTRIES 2 | |
548 | ||
7ba1ba12 MP |
549 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
550 | ||
551 | #define bip_vec_idx(bip, idx) (&(bip->bip_vec[(idx)])) | |
552 | #define bip_vec(bip) bip_vec_idx(bip, 0) | |
553 | ||
554 | #define __bip_for_each_vec(bvl, bip, i, start_idx) \ | |
555 | for (bvl = bip_vec_idx((bip), (start_idx)), i = (start_idx); \ | |
556 | i < (bip)->bip_vcnt; \ | |
557 | bvl++, i++) | |
558 | ||
559 | #define bip_for_each_vec(bvl, bip, i) \ | |
560 | __bip_for_each_vec(bvl, bip, i, (bip)->bip_idx) | |
561 | ||
13f05c8d MP |
562 | #define bio_for_each_integrity_vec(_bvl, _bio, _iter) \ |
563 | for_each_bio(_bio) \ | |
564 | bip_for_each_vec(_bvl, _bio->bi_integrity, _iter) | |
565 | ||
8deaf721 | 566 | #define bio_integrity(bio) (bio->bi_integrity != NULL) |
7ba1ba12 | 567 | |
7ba1ba12 | 568 | extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int); |
1e2a410f | 569 | extern void bio_integrity_free(struct bio *); |
7ba1ba12 MP |
570 | extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int); |
571 | extern int bio_integrity_enabled(struct bio *bio); | |
572 | extern int bio_integrity_set_tag(struct bio *, void *, unsigned int); | |
573 | extern int bio_integrity_get_tag(struct bio *, void *, unsigned int); | |
574 | extern int bio_integrity_prep(struct bio *); | |
575 | extern void bio_integrity_endio(struct bio *, int); | |
576 | extern void bio_integrity_advance(struct bio *, unsigned int); | |
577 | extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int); | |
578 | extern void bio_integrity_split(struct bio *, struct bio_pair *, int); | |
1e2a410f | 579 | extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t); |
7878cba9 MP |
580 | extern int bioset_integrity_create(struct bio_set *, int); |
581 | extern void bioset_integrity_free(struct bio_set *); | |
582 | extern void bio_integrity_init(void); | |
7ba1ba12 MP |
583 | |
584 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
585 | ||
6898e3bd MP |
586 | static inline int bio_integrity(struct bio *bio) |
587 | { | |
588 | return 0; | |
589 | } | |
590 | ||
591 | static inline int bio_integrity_enabled(struct bio *bio) | |
592 | { | |
593 | return 0; | |
594 | } | |
595 | ||
596 | static inline int bioset_integrity_create(struct bio_set *bs, int pool_size) | |
597 | { | |
598 | return 0; | |
599 | } | |
600 | ||
601 | static inline void bioset_integrity_free (struct bio_set *bs) | |
602 | { | |
603 | return; | |
604 | } | |
605 | ||
606 | static inline int bio_integrity_prep(struct bio *bio) | |
607 | { | |
608 | return 0; | |
609 | } | |
610 | ||
1e2a410f | 611 | static inline void bio_integrity_free(struct bio *bio) |
6898e3bd MP |
612 | { |
613 | return; | |
614 | } | |
615 | ||
0c614e2d | 616 | static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
1e2a410f | 617 | gfp_t gfp_mask) |
0c614e2d SR |
618 | { |
619 | return 0; | |
620 | } | |
6898e3bd MP |
621 | |
622 | static inline void bio_integrity_split(struct bio *bio, struct bio_pair *bp, | |
623 | int sectors) | |
624 | { | |
625 | return; | |
626 | } | |
627 | ||
628 | static inline void bio_integrity_advance(struct bio *bio, | |
629 | unsigned int bytes_done) | |
630 | { | |
631 | return; | |
632 | } | |
633 | ||
634 | static inline void bio_integrity_trim(struct bio *bio, unsigned int offset, | |
635 | unsigned int sectors) | |
636 | { | |
637 | return; | |
638 | } | |
639 | ||
640 | static inline void bio_integrity_init(void) | |
641 | { | |
642 | return; | |
643 | } | |
7ba1ba12 MP |
644 | |
645 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
646 | ||
02a5e0ac | 647 | #endif /* CONFIG_BLOCK */ |
1da177e4 | 648 | #endif /* __LINUX_BIO_H */ |