Commit | Line | Data |
---|---|---|
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)])) | |
a4ad39b1 | 65 | #define __bio_iovec(bio) bio_iovec_idx((bio), (bio)->bi_iter.bi_idx) |
7988613b KO |
66 | |
67 | #define bio_iter_iovec(bio, iter) ((bio)->bi_io_vec[(iter).bi_idx]) | |
a4ad39b1 KO |
68 | |
69 | #define bio_page(bio) (bio_iovec((bio)).bv_page) | |
70 | #define bio_offset(bio) (bio_iovec((bio)).bv_offset) | |
7988613b KO |
71 | #define bio_iovec(bio) (*__bio_iovec(bio)) |
72 | ||
4f024f37 KO |
73 | #define bio_segments(bio) ((bio)->bi_vcnt - (bio)->bi_iter.bi_idx) |
74 | #define bio_sectors(bio) ((bio)->bi_iter.bi_size >> 9) | |
75 | #define bio_end_sector(bio) ((bio)->bi_iter.bi_sector + bio_sectors((bio))) | |
bf2de6f5 | 76 | |
2e46e8b2 | 77 | static inline unsigned int bio_cur_bytes(struct bio *bio) |
bf2de6f5 JA |
78 | { |
79 | if (bio->bi_vcnt) | |
a4ad39b1 | 80 | return bio_iovec(bio).bv_len; |
fb2dce86 | 81 | else /* dataless requests such as discard */ |
4f024f37 | 82 | return bio->bi_iter.bi_size; |
bf2de6f5 JA |
83 | } |
84 | ||
85 | static inline void *bio_data(struct bio *bio) | |
86 | { | |
87 | if (bio->bi_vcnt) | |
88 | return page_address(bio_page(bio)) + bio_offset(bio); | |
89 | ||
90 | return NULL; | |
91 | } | |
1da177e4 LT |
92 | |
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 | */ | |
0eb5afb3 | 105 | #define __bio_kmap_atomic(bio, idx) \ |
e8e3c3d6 | 106 | (kmap_atomic(bio_iovec_idx((bio), (idx))->bv_page) + \ |
1da177e4 LT |
107 | bio_iovec_idx((bio), (idx))->bv_offset) |
108 | ||
0eb5afb3 | 109 | #define __bio_kunmap_atomic(addr) 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) | |
4f024f37 | 116 | #define __BVEC_START(bio) bio_iovec_idx((bio), (bio)->bi_iter.bi_idx) |
1da177e4 | 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 | 138 | |
d74c6d51 KO |
139 | /* |
140 | * drivers should _never_ use the all version - the bio may have been split | |
141 | * before it got to the driver and the driver won't own all of it | |
142 | */ | |
143 | #define bio_for_each_segment_all(bvl, bio, i) \ | |
144 | for (i = 0; \ | |
145 | bvl = bio_iovec_idx((bio), (i)), i < (bio)->bi_vcnt; \ | |
146 | i++) | |
147 | ||
7988613b KO |
148 | #define __bio_for_each_segment(bvl, bio, iter, start) \ |
149 | for (iter = (start); \ | |
150 | bvl = bio_iter_iovec((bio), (iter)), \ | |
151 | (iter).bi_idx < (bio)->bi_vcnt; \ | |
152 | (iter).bi_idx++) | |
153 | ||
154 | #define bio_for_each_segment(bvl, bio, iter) \ | |
155 | __bio_for_each_segment(bvl, bio, iter, (bio)->bi_iter) | |
156 | ||
157 | #define bio_iter_last(bio, iter) ((iter).bi_idx == (bio)->bi_vcnt - 1) | |
1da177e4 LT |
158 | |
159 | /* | |
160 | * get a reference to a bio, so it won't disappear. the intended use is | |
161 | * something like: | |
162 | * | |
163 | * bio_get(bio); | |
164 | * submit_bio(rw, bio); | |
165 | * if (bio->bi_flags ...) | |
166 | * do_something | |
167 | * bio_put(bio); | |
168 | * | |
169 | * without the bio_get(), it could potentially complete I/O before submit_bio | |
170 | * returns. and then bio would be freed memory when if (bio->bi_flags ...) | |
171 | * runs | |
172 | */ | |
173 | #define bio_get(bio) atomic_inc(&(bio)->bi_cnt) | |
174 | ||
7ba1ba12 MP |
175 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
176 | /* | |
177 | * bio integrity payload | |
178 | */ | |
179 | struct bio_integrity_payload { | |
180 | struct bio *bip_bio; /* parent bio */ | |
7ba1ba12 MP |
181 | |
182 | sector_t bip_sector; /* virtual start sector */ | |
183 | ||
184 | void *bip_buf; /* generated integrity data */ | |
185 | bio_end_io_t *bip_end_io; /* saved I/O completion fn */ | |
186 | ||
7ba1ba12 MP |
187 | unsigned int bip_size; |
188 | ||
7878cba9 | 189 | unsigned short bip_slab; /* slab the bip came from */ |
7ba1ba12 MP |
190 | unsigned short bip_vcnt; /* # of integrity bio_vecs */ |
191 | unsigned short bip_idx; /* current bip_vec index */ | |
29ed7813 | 192 | unsigned bip_owns_buf:1; /* should free bip_buf */ |
7ba1ba12 MP |
193 | |
194 | struct work_struct bip_work; /* I/O completion */ | |
6fda981c KO |
195 | |
196 | struct bio_vec *bip_vec; | |
197 | struct bio_vec bip_inline_vecs[0];/* embedded bvec array */ | |
7ba1ba12 MP |
198 | }; |
199 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1da177e4 LT |
200 | |
201 | /* | |
202 | * A bio_pair is used when we need to split a bio. | |
203 | * This can only happen for a bio that refers to just one | |
204 | * page of data, and in the unusual situation when the | |
205 | * page crosses a chunk/device boundary | |
206 | * | |
207 | * The address of the master bio is stored in bio1.bi_private | |
208 | * The address of the pool the pair was allocated from is stored | |
209 | * in bio2.bi_private | |
210 | */ | |
211 | struct bio_pair { | |
7ba1ba12 MP |
212 | struct bio bio1, bio2; |
213 | struct bio_vec bv1, bv2; | |
214 | #if defined(CONFIG_BLK_DEV_INTEGRITY) | |
215 | struct bio_integrity_payload bip1, bip2; | |
216 | struct bio_vec iv1, iv2; | |
217 | #endif | |
218 | atomic_t cnt; | |
219 | int error; | |
1da177e4 | 220 | }; |
6feef531 | 221 | extern struct bio_pair *bio_split(struct bio *bi, int first_sectors); |
1da177e4 | 222 | extern void bio_pair_release(struct bio_pair *dbio); |
6678d83f | 223 | extern void bio_trim(struct bio *bio, int offset, int size); |
1da177e4 | 224 | |
bb799ca0 | 225 | extern struct bio_set *bioset_create(unsigned int, unsigned int); |
1da177e4 | 226 | extern void bioset_free(struct bio_set *); |
9f060e22 | 227 | extern mempool_t *biovec_create_pool(struct bio_set *bs, int pool_entries); |
1da177e4 | 228 | |
dd0fc66f | 229 | extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *); |
1da177e4 LT |
230 | extern void bio_put(struct bio *); |
231 | ||
bf800ef1 KO |
232 | extern void __bio_clone(struct bio *, struct bio *); |
233 | extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs); | |
234 | ||
3f86a82a KO |
235 | extern struct bio_set *fs_bio_set; |
236 | ||
237 | static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) | |
238 | { | |
239 | return bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set); | |
240 | } | |
241 | ||
bf800ef1 KO |
242 | static inline struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask) |
243 | { | |
244 | return bio_clone_bioset(bio, gfp_mask, fs_bio_set); | |
245 | } | |
246 | ||
3f86a82a KO |
247 | static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs) |
248 | { | |
249 | return bio_alloc_bioset(gfp_mask, nr_iovecs, NULL); | |
250 | } | |
251 | ||
bf800ef1 KO |
252 | static inline struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask) |
253 | { | |
254 | return bio_clone_bioset(bio, gfp_mask, NULL); | |
255 | ||
256 | } | |
257 | ||
6712ecf8 | 258 | extern void bio_endio(struct bio *, int); |
1da177e4 LT |
259 | struct request_queue; |
260 | extern int bio_phys_segments(struct request_queue *, struct bio *); | |
1da177e4 | 261 | |
9e882242 | 262 | extern int submit_bio_wait(int rw, struct bio *bio); |
054bdf64 KO |
263 | extern void bio_advance(struct bio *, unsigned); |
264 | ||
1da177e4 | 265 | extern void bio_init(struct bio *); |
f44b48c7 | 266 | extern void bio_reset(struct bio *); |
1da177e4 LT |
267 | |
268 | extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int); | |
6e68af66 MC |
269 | extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *, |
270 | unsigned int, unsigned int); | |
1da177e4 | 271 | extern int bio_get_nr_vecs(struct block_device *); |
ad3316bf | 272 | extern sector_t bio_sector_offset(struct bio *, unsigned short, unsigned int); |
1da177e4 | 273 | extern struct bio *bio_map_user(struct request_queue *, struct block_device *, |
a3bce90e | 274 | unsigned long, unsigned int, int, gfp_t); |
f1970baf | 275 | struct sg_iovec; |
152e283f | 276 | struct rq_map_data; |
f1970baf JB |
277 | extern struct bio *bio_map_user_iov(struct request_queue *, |
278 | struct block_device *, | |
a3bce90e | 279 | struct sg_iovec *, int, int, gfp_t); |
1da177e4 | 280 | extern void bio_unmap_user(struct bio *); |
df46b9a4 | 281 | extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int, |
27496a8c | 282 | gfp_t); |
68154e90 FT |
283 | extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int, |
284 | gfp_t, int); | |
1da177e4 LT |
285 | extern void bio_set_pages_dirty(struct bio *bio); |
286 | extern void bio_check_pages_dirty(struct bio *bio); | |
2d4dc890 IL |
287 | |
288 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
289 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
290 | #endif | |
291 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
292 | extern void bio_flush_dcache_pages(struct bio *bi); | |
293 | #else | |
294 | static inline void bio_flush_dcache_pages(struct bio *bi) | |
295 | { | |
296 | } | |
297 | #endif | |
298 | ||
16ac3d63 | 299 | extern void bio_copy_data(struct bio *dst, struct bio *src); |
a0787606 | 300 | extern int bio_alloc_pages(struct bio *bio, gfp_t gfp); |
16ac3d63 | 301 | |
152e283f FT |
302 | extern struct bio *bio_copy_user(struct request_queue *, struct rq_map_data *, |
303 | unsigned long, unsigned int, int, gfp_t); | |
304 | extern struct bio *bio_copy_user_iov(struct request_queue *, | |
305 | struct rq_map_data *, struct sg_iovec *, | |
a3bce90e | 306 | int, int, gfp_t); |
1da177e4 LT |
307 | extern int bio_uncopy_user(struct bio *); |
308 | void zero_fill_bio(struct bio *bio); | |
9f060e22 KO |
309 | extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *); |
310 | extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int); | |
7ba1ba12 | 311 | extern unsigned int bvec_nr_vecs(unsigned short idx); |
51d654e1 | 312 | |
852c788f TH |
313 | #ifdef CONFIG_BLK_CGROUP |
314 | int bio_associate_current(struct bio *bio); | |
315 | void bio_disassociate_task(struct bio *bio); | |
316 | #else /* CONFIG_BLK_CGROUP */ | |
317 | static inline int bio_associate_current(struct bio *bio) { return -ENOENT; } | |
318 | static inline void bio_disassociate_task(struct bio *bio) { } | |
319 | #endif /* CONFIG_BLK_CGROUP */ | |
320 | ||
1da177e4 LT |
321 | #ifdef CONFIG_HIGHMEM |
322 | /* | |
20b636bf AB |
323 | * remember never ever reenable interrupts between a bvec_kmap_irq and |
324 | * bvec_kunmap_irq! | |
1da177e4 | 325 | */ |
4f570f99 | 326 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
1da177e4 LT |
327 | { |
328 | unsigned long addr; | |
329 | ||
330 | /* | |
331 | * might not be a highmem page, but the preempt/irq count | |
332 | * balancing is a lot nicer this way | |
333 | */ | |
334 | local_irq_save(*flags); | |
e8e3c3d6 | 335 | addr = (unsigned long) kmap_atomic(bvec->bv_page); |
1da177e4 LT |
336 | |
337 | BUG_ON(addr & ~PAGE_MASK); | |
338 | ||
339 | return (char *) addr + bvec->bv_offset; | |
340 | } | |
341 | ||
4f570f99 | 342 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) |
1da177e4 LT |
343 | { |
344 | unsigned long ptr = (unsigned long) buffer & PAGE_MASK; | |
345 | ||
e8e3c3d6 | 346 | kunmap_atomic((void *) ptr); |
1da177e4 LT |
347 | local_irq_restore(*flags); |
348 | } | |
349 | ||
350 | #else | |
11a691be GU |
351 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
352 | { | |
353 | return page_address(bvec->bv_page) + bvec->bv_offset; | |
354 | } | |
355 | ||
356 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) | |
357 | { | |
358 | *flags = 0; | |
359 | } | |
1da177e4 LT |
360 | #endif |
361 | ||
c2d08dad | 362 | static inline char *__bio_kmap_irq(struct bio *bio, unsigned short idx, |
1da177e4 LT |
363 | unsigned long *flags) |
364 | { | |
365 | return bvec_kmap_irq(bio_iovec_idx(bio, idx), flags); | |
366 | } | |
367 | #define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags) | |
368 | ||
369 | #define bio_kmap_irq(bio, flags) \ | |
4f024f37 | 370 | __bio_kmap_irq((bio), (bio)->bi_iter.bi_idx, (flags)) |
1da177e4 LT |
371 | #define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags) |
372 | ||
7a67f63b JA |
373 | /* |
374 | * Check whether this bio carries any data or not. A NULL bio is allowed. | |
375 | */ | |
e2a60da7 | 376 | static inline bool bio_has_data(struct bio *bio) |
7a67f63b | 377 | { |
e2a60da7 MP |
378 | if (bio && bio->bi_vcnt) |
379 | return true; | |
380 | ||
381 | return false; | |
382 | } | |
383 | ||
384 | static inline bool bio_is_rw(struct bio *bio) | |
385 | { | |
386 | if (!bio_has_data(bio)) | |
387 | return false; | |
388 | ||
4363ac7c MP |
389 | if (bio->bi_rw & REQ_WRITE_SAME) |
390 | return false; | |
391 | ||
e2a60da7 MP |
392 | return true; |
393 | } | |
394 | ||
395 | static inline bool bio_mergeable(struct bio *bio) | |
396 | { | |
397 | if (bio->bi_rw & REQ_NOMERGE_FLAGS) | |
398 | return false; | |
399 | ||
400 | return true; | |
7a67f63b JA |
401 | } |
402 | ||
8f3d8ba2 | 403 | /* |
e686307f | 404 | * BIO list management for use by remapping drivers (e.g. DM or MD) and loop. |
8f3d8ba2 CH |
405 | * |
406 | * A bio_list anchors a singly-linked list of bios chained through the bi_next | |
407 | * member of the bio. The bio_list also caches the last list member to allow | |
408 | * fast access to the tail. | |
409 | */ | |
410 | struct bio_list { | |
411 | struct bio *head; | |
412 | struct bio *tail; | |
413 | }; | |
414 | ||
415 | static inline int bio_list_empty(const struct bio_list *bl) | |
416 | { | |
417 | return bl->head == NULL; | |
418 | } | |
419 | ||
420 | static inline void bio_list_init(struct bio_list *bl) | |
421 | { | |
422 | bl->head = bl->tail = NULL; | |
423 | } | |
424 | ||
320ae51f JA |
425 | #define BIO_EMPTY_LIST { NULL, NULL } |
426 | ||
8f3d8ba2 CH |
427 | #define bio_list_for_each(bio, bl) \ |
428 | for (bio = (bl)->head; bio; bio = bio->bi_next) | |
429 | ||
430 | static inline unsigned bio_list_size(const struct bio_list *bl) | |
431 | { | |
432 | unsigned sz = 0; | |
433 | struct bio *bio; | |
434 | ||
435 | bio_list_for_each(bio, bl) | |
436 | sz++; | |
437 | ||
438 | return sz; | |
439 | } | |
440 | ||
441 | static inline void bio_list_add(struct bio_list *bl, struct bio *bio) | |
442 | { | |
443 | bio->bi_next = NULL; | |
444 | ||
445 | if (bl->tail) | |
446 | bl->tail->bi_next = bio; | |
447 | else | |
448 | bl->head = bio; | |
449 | ||
450 | bl->tail = bio; | |
451 | } | |
452 | ||
453 | static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio) | |
454 | { | |
455 | bio->bi_next = bl->head; | |
456 | ||
457 | bl->head = bio; | |
458 | ||
459 | if (!bl->tail) | |
460 | bl->tail = bio; | |
461 | } | |
462 | ||
463 | static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2) | |
464 | { | |
465 | if (!bl2->head) | |
466 | return; | |
467 | ||
468 | if (bl->tail) | |
469 | bl->tail->bi_next = bl2->head; | |
470 | else | |
471 | bl->head = bl2->head; | |
472 | ||
473 | bl->tail = bl2->tail; | |
474 | } | |
475 | ||
476 | static inline void bio_list_merge_head(struct bio_list *bl, | |
477 | struct bio_list *bl2) | |
478 | { | |
479 | if (!bl2->head) | |
480 | return; | |
481 | ||
482 | if (bl->head) | |
483 | bl2->tail->bi_next = bl->head; | |
484 | else | |
485 | bl->tail = bl2->tail; | |
486 | ||
487 | bl->head = bl2->head; | |
488 | } | |
489 | ||
13685a16 GU |
490 | static inline struct bio *bio_list_peek(struct bio_list *bl) |
491 | { | |
492 | return bl->head; | |
493 | } | |
494 | ||
8f3d8ba2 CH |
495 | static inline struct bio *bio_list_pop(struct bio_list *bl) |
496 | { | |
497 | struct bio *bio = bl->head; | |
498 | ||
499 | if (bio) { | |
500 | bl->head = bl->head->bi_next; | |
501 | if (!bl->head) | |
502 | bl->tail = NULL; | |
503 | ||
504 | bio->bi_next = NULL; | |
505 | } | |
506 | ||
507 | return bio; | |
508 | } | |
509 | ||
510 | static inline struct bio *bio_list_get(struct bio_list *bl) | |
511 | { | |
512 | struct bio *bio = bl->head; | |
513 | ||
514 | bl->head = bl->tail = NULL; | |
515 | ||
516 | return bio; | |
517 | } | |
518 | ||
57fb233f KO |
519 | /* |
520 | * bio_set is used to allow other portions of the IO system to | |
521 | * allocate their own private memory pools for bio and iovec structures. | |
522 | * These memory pools in turn all allocate from the bio_slab | |
523 | * and the bvec_slabs[]. | |
524 | */ | |
525 | #define BIO_POOL_SIZE 2 | |
526 | #define BIOVEC_NR_POOLS 6 | |
527 | #define BIOVEC_MAX_IDX (BIOVEC_NR_POOLS - 1) | |
528 | ||
529 | struct bio_set { | |
530 | struct kmem_cache *bio_slab; | |
531 | unsigned int front_pad; | |
532 | ||
533 | mempool_t *bio_pool; | |
9f060e22 | 534 | mempool_t *bvec_pool; |
57fb233f KO |
535 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
536 | mempool_t *bio_integrity_pool; | |
9f060e22 | 537 | mempool_t *bvec_integrity_pool; |
57fb233f | 538 | #endif |
df2cb6da KO |
539 | |
540 | /* | |
541 | * Deadlock avoidance for stacking block drivers: see comments in | |
542 | * bio_alloc_bioset() for details | |
543 | */ | |
544 | spinlock_t rescue_lock; | |
545 | struct bio_list rescue_list; | |
546 | struct work_struct rescue_work; | |
547 | struct workqueue_struct *rescue_workqueue; | |
57fb233f KO |
548 | }; |
549 | ||
550 | struct biovec_slab { | |
551 | int nr_vecs; | |
552 | char *name; | |
553 | struct kmem_cache *slab; | |
554 | }; | |
555 | ||
556 | /* | |
557 | * a small number of entries is fine, not going to be performance critical. | |
558 | * basically we just need to survive | |
559 | */ | |
560 | #define BIO_SPLIT_ENTRIES 2 | |
561 | ||
7ba1ba12 MP |
562 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
563 | ||
564 | #define bip_vec_idx(bip, idx) (&(bip->bip_vec[(idx)])) | |
565 | #define bip_vec(bip) bip_vec_idx(bip, 0) | |
566 | ||
567 | #define __bip_for_each_vec(bvl, bip, i, start_idx) \ | |
568 | for (bvl = bip_vec_idx((bip), (start_idx)), i = (start_idx); \ | |
569 | i < (bip)->bip_vcnt; \ | |
570 | bvl++, i++) | |
571 | ||
572 | #define bip_for_each_vec(bvl, bip, i) \ | |
573 | __bip_for_each_vec(bvl, bip, i, (bip)->bip_idx) | |
574 | ||
13f05c8d MP |
575 | #define bio_for_each_integrity_vec(_bvl, _bio, _iter) \ |
576 | for_each_bio(_bio) \ | |
577 | bip_for_each_vec(_bvl, _bio->bi_integrity, _iter) | |
578 | ||
8deaf721 | 579 | #define bio_integrity(bio) (bio->bi_integrity != NULL) |
7ba1ba12 | 580 | |
7ba1ba12 | 581 | extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int); |
1e2a410f | 582 | extern void bio_integrity_free(struct bio *); |
7ba1ba12 MP |
583 | extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int); |
584 | extern int bio_integrity_enabled(struct bio *bio); | |
585 | extern int bio_integrity_set_tag(struct bio *, void *, unsigned int); | |
586 | extern int bio_integrity_get_tag(struct bio *, void *, unsigned int); | |
587 | extern int bio_integrity_prep(struct bio *); | |
588 | extern void bio_integrity_endio(struct bio *, int); | |
589 | extern void bio_integrity_advance(struct bio *, unsigned int); | |
590 | extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int); | |
591 | extern void bio_integrity_split(struct bio *, struct bio_pair *, int); | |
1e2a410f | 592 | extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t); |
7878cba9 MP |
593 | extern int bioset_integrity_create(struct bio_set *, int); |
594 | extern void bioset_integrity_free(struct bio_set *); | |
595 | extern void bio_integrity_init(void); | |
7ba1ba12 MP |
596 | |
597 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
598 | ||
6898e3bd MP |
599 | static inline int bio_integrity(struct bio *bio) |
600 | { | |
601 | return 0; | |
602 | } | |
603 | ||
604 | static inline int bio_integrity_enabled(struct bio *bio) | |
605 | { | |
606 | return 0; | |
607 | } | |
608 | ||
609 | static inline int bioset_integrity_create(struct bio_set *bs, int pool_size) | |
610 | { | |
611 | return 0; | |
612 | } | |
613 | ||
614 | static inline void bioset_integrity_free (struct bio_set *bs) | |
615 | { | |
616 | return; | |
617 | } | |
618 | ||
619 | static inline int bio_integrity_prep(struct bio *bio) | |
620 | { | |
621 | return 0; | |
622 | } | |
623 | ||
1e2a410f | 624 | static inline void bio_integrity_free(struct bio *bio) |
6898e3bd MP |
625 | { |
626 | return; | |
627 | } | |
628 | ||
0c614e2d | 629 | static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
1e2a410f | 630 | gfp_t gfp_mask) |
0c614e2d SR |
631 | { |
632 | return 0; | |
633 | } | |
6898e3bd MP |
634 | |
635 | static inline void bio_integrity_split(struct bio *bio, struct bio_pair *bp, | |
636 | int sectors) | |
637 | { | |
638 | return; | |
639 | } | |
640 | ||
641 | static inline void bio_integrity_advance(struct bio *bio, | |
642 | unsigned int bytes_done) | |
643 | { | |
644 | return; | |
645 | } | |
646 | ||
647 | static inline void bio_integrity_trim(struct bio *bio, unsigned int offset, | |
648 | unsigned int sectors) | |
649 | { | |
650 | return; | |
651 | } | |
652 | ||
653 | static inline void bio_integrity_init(void) | |
654 | { | |
655 | return; | |
656 | } | |
7ba1ba12 MP |
657 | |
658 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
659 | ||
02a5e0ac | 660 | #endif /* CONFIG_BLOCK */ |
1da177e4 | 661 | #endif /* __LINUX_BIO_H */ |