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 | 66 | |
4550dd6c | 67 | #define __bvec_iter_bvec(bvec, iter) (&(bvec)[(iter).bi_idx]) |
a4ad39b1 | 68 | |
4550dd6c KO |
69 | #define bvec_iter_page(bvec, iter) \ |
70 | (__bvec_iter_bvec((bvec), (iter))->bv_page) | |
71 | ||
72 | #define bvec_iter_len(bvec, iter) \ | |
73 | min((iter).bi_size, \ | |
74 | __bvec_iter_bvec((bvec), (iter))->bv_len - (iter).bi_bvec_done) | |
75 | ||
76 | #define bvec_iter_offset(bvec, iter) \ | |
77 | (__bvec_iter_bvec((bvec), (iter))->bv_offset + (iter).bi_bvec_done) | |
78 | ||
79 | #define bvec_iter_bvec(bvec, iter) \ | |
80 | ((struct bio_vec) { \ | |
81 | .bv_page = bvec_iter_page((bvec), (iter)), \ | |
82 | .bv_len = bvec_iter_len((bvec), (iter)), \ | |
83 | .bv_offset = bvec_iter_offset((bvec), (iter)), \ | |
84 | }) | |
85 | ||
86 | #define bio_iter_iovec(bio, iter) \ | |
87 | bvec_iter_bvec((bio)->bi_io_vec, (iter)) | |
88 | ||
89 | #define bio_iter_page(bio, iter) \ | |
90 | bvec_iter_page((bio)->bi_io_vec, (iter)) | |
91 | #define bio_iter_len(bio, iter) \ | |
92 | bvec_iter_len((bio)->bi_io_vec, (iter)) | |
93 | #define bio_iter_offset(bio, iter) \ | |
94 | bvec_iter_offset((bio)->bi_io_vec, (iter)) | |
95 | ||
96 | #define bio_page(bio) bio_iter_page((bio), (bio)->bi_iter) | |
97 | #define bio_offset(bio) bio_iter_offset((bio), (bio)->bi_iter) | |
98 | #define bio_iovec(bio) bio_iter_iovec((bio), (bio)->bi_iter) | |
7988613b | 99 | |
4f024f37 KO |
100 | #define bio_segments(bio) ((bio)->bi_vcnt - (bio)->bi_iter.bi_idx) |
101 | #define bio_sectors(bio) ((bio)->bi_iter.bi_size >> 9) | |
102 | #define bio_end_sector(bio) ((bio)->bi_iter.bi_sector + bio_sectors((bio))) | |
bf2de6f5 | 103 | |
2e46e8b2 | 104 | static inline unsigned int bio_cur_bytes(struct bio *bio) |
bf2de6f5 JA |
105 | { |
106 | if (bio->bi_vcnt) | |
a4ad39b1 | 107 | return bio_iovec(bio).bv_len; |
fb2dce86 | 108 | else /* dataless requests such as discard */ |
4f024f37 | 109 | return bio->bi_iter.bi_size; |
bf2de6f5 JA |
110 | } |
111 | ||
112 | static inline void *bio_data(struct bio *bio) | |
113 | { | |
114 | if (bio->bi_vcnt) | |
115 | return page_address(bio_page(bio)) + bio_offset(bio); | |
116 | ||
117 | return NULL; | |
118 | } | |
1da177e4 LT |
119 | |
120 | /* | |
121 | * will die | |
122 | */ | |
123 | #define bio_to_phys(bio) (page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio))) | |
124 | #define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset) | |
125 | ||
126 | /* | |
127 | * queues that have highmem support enabled may still need to revert to | |
128 | * PIO transfers occasionally and thus map high pages temporarily. For | |
129 | * permanent PIO fall back, user is probably better off disabling highmem | |
130 | * I/O completely on that queue (see ide-dma for example) | |
131 | */ | |
0eb5afb3 | 132 | #define __bio_kmap_atomic(bio, idx) \ |
e8e3c3d6 | 133 | (kmap_atomic(bio_iovec_idx((bio), (idx))->bv_page) + \ |
1da177e4 LT |
134 | bio_iovec_idx((bio), (idx))->bv_offset) |
135 | ||
0eb5afb3 | 136 | #define __bio_kunmap_atomic(addr) kunmap_atomic(addr) |
1da177e4 LT |
137 | |
138 | /* | |
139 | * merge helpers etc | |
140 | */ | |
141 | ||
142 | #define __BVEC_END(bio) bio_iovec_idx((bio), (bio)->bi_vcnt - 1) | |
4f024f37 | 143 | #define __BVEC_START(bio) bio_iovec_idx((bio), (bio)->bi_iter.bi_idx) |
1da177e4 | 144 | |
f92131c3 JF |
145 | /* Default implementation of BIOVEC_PHYS_MERGEABLE */ |
146 | #define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ | |
147 | ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2))) | |
148 | ||
1da177e4 LT |
149 | /* |
150 | * allow arch override, for eg virtualized architectures (put in asm/io.h) | |
151 | */ | |
152 | #ifndef BIOVEC_PHYS_MERGEABLE | |
153 | #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ | |
f92131c3 | 154 | __BIOVEC_PHYS_MERGEABLE(vec1, vec2) |
1da177e4 LT |
155 | #endif |
156 | ||
1da177e4 LT |
157 | #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \ |
158 | (((addr1) | (mask)) == (((addr2) - 1) | (mask))) | |
159 | #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \ | |
ae03bf63 | 160 | __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q))) |
1da177e4 LT |
161 | #define BIO_SEG_BOUNDARY(q, b1, b2) \ |
162 | BIOVEC_SEG_BOUNDARY((q), __BVEC_END((b1)), __BVEC_START((b2))) | |
163 | ||
6712ecf8 | 164 | #define bio_io_error(bio) bio_endio((bio), -EIO) |
1da177e4 | 165 | |
d74c6d51 KO |
166 | /* |
167 | * drivers should _never_ use the all version - the bio may have been split | |
168 | * before it got to the driver and the driver won't own all of it | |
169 | */ | |
170 | #define bio_for_each_segment_all(bvl, bio, i) \ | |
171 | for (i = 0; \ | |
172 | bvl = bio_iovec_idx((bio), (i)), i < (bio)->bi_vcnt; \ | |
173 | i++) | |
174 | ||
4550dd6c KO |
175 | static inline void bvec_iter_advance(struct bio_vec *bv, struct bvec_iter *iter, |
176 | unsigned bytes) | |
177 | { | |
178 | WARN_ONCE(bytes > iter->bi_size, | |
179 | "Attempted to advance past end of bvec iter\n"); | |
180 | ||
181 | while (bytes) { | |
182 | unsigned len = min(bytes, bvec_iter_len(bv, *iter)); | |
183 | ||
184 | bytes -= len; | |
185 | iter->bi_size -= len; | |
186 | iter->bi_bvec_done += len; | |
187 | ||
188 | if (iter->bi_bvec_done == __bvec_iter_bvec(bv, *iter)->bv_len) { | |
189 | iter->bi_bvec_done = 0; | |
190 | iter->bi_idx++; | |
191 | } | |
192 | } | |
193 | } | |
194 | ||
195 | #define for_each_bvec(bvl, bio_vec, iter, start) \ | |
196 | for ((iter) = start; \ | |
197 | (bvl) = bvec_iter_bvec((bio_vec), (iter)), \ | |
198 | (iter).bi_size; \ | |
199 | bvec_iter_advance((bio_vec), &(iter), (bvl).bv_len)) | |
200 | ||
201 | ||
202 | static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter, | |
203 | unsigned bytes) | |
204 | { | |
205 | iter->bi_sector += bytes >> 9; | |
206 | ||
207 | if (bio->bi_rw & BIO_NO_ADVANCE_ITER_MASK) | |
208 | iter->bi_size -= bytes; | |
209 | else | |
210 | bvec_iter_advance(bio->bi_io_vec, iter, bytes); | |
211 | } | |
212 | ||
7988613b KO |
213 | #define __bio_for_each_segment(bvl, bio, iter, start) \ |
214 | for (iter = (start); \ | |
4550dd6c KO |
215 | (iter).bi_size && \ |
216 | ((bvl = bio_iter_iovec((bio), (iter))), 1); \ | |
217 | bio_advance_iter((bio), &(iter), (bvl).bv_len)) | |
7988613b KO |
218 | |
219 | #define bio_for_each_segment(bvl, bio, iter) \ | |
220 | __bio_for_each_segment(bvl, bio, iter, (bio)->bi_iter) | |
221 | ||
4550dd6c | 222 | #define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len) |
1da177e4 LT |
223 | |
224 | /* | |
225 | * get a reference to a bio, so it won't disappear. the intended use is | |
226 | * something like: | |
227 | * | |
228 | * bio_get(bio); | |
229 | * submit_bio(rw, bio); | |
230 | * if (bio->bi_flags ...) | |
231 | * do_something | |
232 | * bio_put(bio); | |
233 | * | |
234 | * without the bio_get(), it could potentially complete I/O before submit_bio | |
235 | * returns. and then bio would be freed memory when if (bio->bi_flags ...) | |
236 | * runs | |
237 | */ | |
238 | #define bio_get(bio) atomic_inc(&(bio)->bi_cnt) | |
239 | ||
7ba1ba12 MP |
240 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
241 | /* | |
242 | * bio integrity payload | |
243 | */ | |
244 | struct bio_integrity_payload { | |
245 | struct bio *bip_bio; /* parent bio */ | |
7ba1ba12 | 246 | |
d57a5f7c | 247 | struct bvec_iter bip_iter; |
7ba1ba12 | 248 | |
d57a5f7c | 249 | /* kill - should just use bip_vec */ |
7ba1ba12 | 250 | void *bip_buf; /* generated integrity data */ |
7ba1ba12 | 251 | |
d57a5f7c | 252 | bio_end_io_t *bip_end_io; /* saved I/O completion fn */ |
7ba1ba12 | 253 | |
7878cba9 | 254 | unsigned short bip_slab; /* slab the bip came from */ |
7ba1ba12 | 255 | unsigned short bip_vcnt; /* # of integrity bio_vecs */ |
29ed7813 | 256 | unsigned bip_owns_buf:1; /* should free bip_buf */ |
7ba1ba12 MP |
257 | |
258 | struct work_struct bip_work; /* I/O completion */ | |
6fda981c KO |
259 | |
260 | struct bio_vec *bip_vec; | |
261 | struct bio_vec bip_inline_vecs[0];/* embedded bvec array */ | |
7ba1ba12 MP |
262 | }; |
263 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1da177e4 LT |
264 | |
265 | /* | |
266 | * A bio_pair is used when we need to split a bio. | |
267 | * This can only happen for a bio that refers to just one | |
268 | * page of data, and in the unusual situation when the | |
269 | * page crosses a chunk/device boundary | |
270 | * | |
271 | * The address of the master bio is stored in bio1.bi_private | |
272 | * The address of the pool the pair was allocated from is stored | |
273 | * in bio2.bi_private | |
274 | */ | |
275 | struct bio_pair { | |
7ba1ba12 MP |
276 | struct bio bio1, bio2; |
277 | struct bio_vec bv1, bv2; | |
278 | #if defined(CONFIG_BLK_DEV_INTEGRITY) | |
279 | struct bio_integrity_payload bip1, bip2; | |
280 | struct bio_vec iv1, iv2; | |
281 | #endif | |
282 | atomic_t cnt; | |
283 | int error; | |
1da177e4 | 284 | }; |
6feef531 | 285 | extern struct bio_pair *bio_split(struct bio *bi, int first_sectors); |
1da177e4 | 286 | extern void bio_pair_release(struct bio_pair *dbio); |
6678d83f | 287 | extern void bio_trim(struct bio *bio, int offset, int size); |
1da177e4 | 288 | |
bb799ca0 | 289 | extern struct bio_set *bioset_create(unsigned int, unsigned int); |
1da177e4 | 290 | extern void bioset_free(struct bio_set *); |
9f060e22 | 291 | extern mempool_t *biovec_create_pool(struct bio_set *bs, int pool_entries); |
1da177e4 | 292 | |
dd0fc66f | 293 | extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *); |
1da177e4 LT |
294 | extern void bio_put(struct bio *); |
295 | ||
bf800ef1 KO |
296 | extern void __bio_clone(struct bio *, struct bio *); |
297 | extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs); | |
298 | ||
3f86a82a KO |
299 | extern struct bio_set *fs_bio_set; |
300 | ||
301 | static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) | |
302 | { | |
303 | return bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set); | |
304 | } | |
305 | ||
bf800ef1 KO |
306 | static inline struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask) |
307 | { | |
308 | return bio_clone_bioset(bio, gfp_mask, fs_bio_set); | |
309 | } | |
310 | ||
3f86a82a KO |
311 | static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs) |
312 | { | |
313 | return bio_alloc_bioset(gfp_mask, nr_iovecs, NULL); | |
314 | } | |
315 | ||
bf800ef1 KO |
316 | static inline struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask) |
317 | { | |
318 | return bio_clone_bioset(bio, gfp_mask, NULL); | |
319 | ||
320 | } | |
321 | ||
6712ecf8 | 322 | extern void bio_endio(struct bio *, int); |
1da177e4 LT |
323 | struct request_queue; |
324 | extern int bio_phys_segments(struct request_queue *, struct bio *); | |
1da177e4 | 325 | |
9e882242 | 326 | extern int submit_bio_wait(int rw, struct bio *bio); |
054bdf64 KO |
327 | extern void bio_advance(struct bio *, unsigned); |
328 | ||
1da177e4 | 329 | extern void bio_init(struct bio *); |
f44b48c7 | 330 | extern void bio_reset(struct bio *); |
1da177e4 LT |
331 | |
332 | extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int); | |
6e68af66 MC |
333 | extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *, |
334 | unsigned int, unsigned int); | |
1da177e4 | 335 | extern int bio_get_nr_vecs(struct block_device *); |
ad3316bf | 336 | extern sector_t bio_sector_offset(struct bio *, unsigned short, unsigned int); |
1da177e4 | 337 | extern struct bio *bio_map_user(struct request_queue *, struct block_device *, |
a3bce90e | 338 | unsigned long, unsigned int, int, gfp_t); |
f1970baf | 339 | struct sg_iovec; |
152e283f | 340 | struct rq_map_data; |
f1970baf JB |
341 | extern struct bio *bio_map_user_iov(struct request_queue *, |
342 | struct block_device *, | |
a3bce90e | 343 | struct sg_iovec *, int, int, gfp_t); |
1da177e4 | 344 | extern void bio_unmap_user(struct bio *); |
df46b9a4 | 345 | extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int, |
27496a8c | 346 | gfp_t); |
68154e90 FT |
347 | extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int, |
348 | gfp_t, int); | |
1da177e4 LT |
349 | extern void bio_set_pages_dirty(struct bio *bio); |
350 | extern void bio_check_pages_dirty(struct bio *bio); | |
2d4dc890 IL |
351 | |
352 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
353 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
354 | #endif | |
355 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
356 | extern void bio_flush_dcache_pages(struct bio *bi); | |
357 | #else | |
358 | static inline void bio_flush_dcache_pages(struct bio *bi) | |
359 | { | |
360 | } | |
361 | #endif | |
362 | ||
16ac3d63 | 363 | extern void bio_copy_data(struct bio *dst, struct bio *src); |
a0787606 | 364 | extern int bio_alloc_pages(struct bio *bio, gfp_t gfp); |
16ac3d63 | 365 | |
152e283f FT |
366 | extern struct bio *bio_copy_user(struct request_queue *, struct rq_map_data *, |
367 | unsigned long, unsigned int, int, gfp_t); | |
368 | extern struct bio *bio_copy_user_iov(struct request_queue *, | |
369 | struct rq_map_data *, struct sg_iovec *, | |
a3bce90e | 370 | int, int, gfp_t); |
1da177e4 LT |
371 | extern int bio_uncopy_user(struct bio *); |
372 | void zero_fill_bio(struct bio *bio); | |
9f060e22 KO |
373 | extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *); |
374 | extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int); | |
7ba1ba12 | 375 | extern unsigned int bvec_nr_vecs(unsigned short idx); |
51d654e1 | 376 | |
852c788f TH |
377 | #ifdef CONFIG_BLK_CGROUP |
378 | int bio_associate_current(struct bio *bio); | |
379 | void bio_disassociate_task(struct bio *bio); | |
380 | #else /* CONFIG_BLK_CGROUP */ | |
381 | static inline int bio_associate_current(struct bio *bio) { return -ENOENT; } | |
382 | static inline void bio_disassociate_task(struct bio *bio) { } | |
383 | #endif /* CONFIG_BLK_CGROUP */ | |
384 | ||
1da177e4 LT |
385 | #ifdef CONFIG_HIGHMEM |
386 | /* | |
20b636bf AB |
387 | * remember never ever reenable interrupts between a bvec_kmap_irq and |
388 | * bvec_kunmap_irq! | |
1da177e4 | 389 | */ |
4f570f99 | 390 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
1da177e4 LT |
391 | { |
392 | unsigned long addr; | |
393 | ||
394 | /* | |
395 | * might not be a highmem page, but the preempt/irq count | |
396 | * balancing is a lot nicer this way | |
397 | */ | |
398 | local_irq_save(*flags); | |
e8e3c3d6 | 399 | addr = (unsigned long) kmap_atomic(bvec->bv_page); |
1da177e4 LT |
400 | |
401 | BUG_ON(addr & ~PAGE_MASK); | |
402 | ||
403 | return (char *) addr + bvec->bv_offset; | |
404 | } | |
405 | ||
4f570f99 | 406 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) |
1da177e4 LT |
407 | { |
408 | unsigned long ptr = (unsigned long) buffer & PAGE_MASK; | |
409 | ||
e8e3c3d6 | 410 | kunmap_atomic((void *) ptr); |
1da177e4 LT |
411 | local_irq_restore(*flags); |
412 | } | |
413 | ||
414 | #else | |
11a691be GU |
415 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
416 | { | |
417 | return page_address(bvec->bv_page) + bvec->bv_offset; | |
418 | } | |
419 | ||
420 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) | |
421 | { | |
422 | *flags = 0; | |
423 | } | |
1da177e4 LT |
424 | #endif |
425 | ||
c2d08dad | 426 | static inline char *__bio_kmap_irq(struct bio *bio, unsigned short idx, |
1da177e4 LT |
427 | unsigned long *flags) |
428 | { | |
429 | return bvec_kmap_irq(bio_iovec_idx(bio, idx), flags); | |
430 | } | |
431 | #define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags) | |
432 | ||
433 | #define bio_kmap_irq(bio, flags) \ | |
4f024f37 | 434 | __bio_kmap_irq((bio), (bio)->bi_iter.bi_idx, (flags)) |
1da177e4 LT |
435 | #define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags) |
436 | ||
7a67f63b JA |
437 | /* |
438 | * Check whether this bio carries any data or not. A NULL bio is allowed. | |
439 | */ | |
e2a60da7 | 440 | static inline bool bio_has_data(struct bio *bio) |
7a67f63b | 441 | { |
e2a60da7 MP |
442 | if (bio && bio->bi_vcnt) |
443 | return true; | |
444 | ||
445 | return false; | |
446 | } | |
447 | ||
448 | static inline bool bio_is_rw(struct bio *bio) | |
449 | { | |
450 | if (!bio_has_data(bio)) | |
451 | return false; | |
452 | ||
4363ac7c MP |
453 | if (bio->bi_rw & REQ_WRITE_SAME) |
454 | return false; | |
455 | ||
e2a60da7 MP |
456 | return true; |
457 | } | |
458 | ||
459 | static inline bool bio_mergeable(struct bio *bio) | |
460 | { | |
461 | if (bio->bi_rw & REQ_NOMERGE_FLAGS) | |
462 | return false; | |
463 | ||
464 | return true; | |
7a67f63b JA |
465 | } |
466 | ||
8f3d8ba2 | 467 | /* |
e686307f | 468 | * BIO list management for use by remapping drivers (e.g. DM or MD) and loop. |
8f3d8ba2 CH |
469 | * |
470 | * A bio_list anchors a singly-linked list of bios chained through the bi_next | |
471 | * member of the bio. The bio_list also caches the last list member to allow | |
472 | * fast access to the tail. | |
473 | */ | |
474 | struct bio_list { | |
475 | struct bio *head; | |
476 | struct bio *tail; | |
477 | }; | |
478 | ||
479 | static inline int bio_list_empty(const struct bio_list *bl) | |
480 | { | |
481 | return bl->head == NULL; | |
482 | } | |
483 | ||
484 | static inline void bio_list_init(struct bio_list *bl) | |
485 | { | |
486 | bl->head = bl->tail = NULL; | |
487 | } | |
488 | ||
320ae51f JA |
489 | #define BIO_EMPTY_LIST { NULL, NULL } |
490 | ||
8f3d8ba2 CH |
491 | #define bio_list_for_each(bio, bl) \ |
492 | for (bio = (bl)->head; bio; bio = bio->bi_next) | |
493 | ||
494 | static inline unsigned bio_list_size(const struct bio_list *bl) | |
495 | { | |
496 | unsigned sz = 0; | |
497 | struct bio *bio; | |
498 | ||
499 | bio_list_for_each(bio, bl) | |
500 | sz++; | |
501 | ||
502 | return sz; | |
503 | } | |
504 | ||
505 | static inline void bio_list_add(struct bio_list *bl, struct bio *bio) | |
506 | { | |
507 | bio->bi_next = NULL; | |
508 | ||
509 | if (bl->tail) | |
510 | bl->tail->bi_next = bio; | |
511 | else | |
512 | bl->head = bio; | |
513 | ||
514 | bl->tail = bio; | |
515 | } | |
516 | ||
517 | static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio) | |
518 | { | |
519 | bio->bi_next = bl->head; | |
520 | ||
521 | bl->head = bio; | |
522 | ||
523 | if (!bl->tail) | |
524 | bl->tail = bio; | |
525 | } | |
526 | ||
527 | static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2) | |
528 | { | |
529 | if (!bl2->head) | |
530 | return; | |
531 | ||
532 | if (bl->tail) | |
533 | bl->tail->bi_next = bl2->head; | |
534 | else | |
535 | bl->head = bl2->head; | |
536 | ||
537 | bl->tail = bl2->tail; | |
538 | } | |
539 | ||
540 | static inline void bio_list_merge_head(struct bio_list *bl, | |
541 | struct bio_list *bl2) | |
542 | { | |
543 | if (!bl2->head) | |
544 | return; | |
545 | ||
546 | if (bl->head) | |
547 | bl2->tail->bi_next = bl->head; | |
548 | else | |
549 | bl->tail = bl2->tail; | |
550 | ||
551 | bl->head = bl2->head; | |
552 | } | |
553 | ||
13685a16 GU |
554 | static inline struct bio *bio_list_peek(struct bio_list *bl) |
555 | { | |
556 | return bl->head; | |
557 | } | |
558 | ||
8f3d8ba2 CH |
559 | static inline struct bio *bio_list_pop(struct bio_list *bl) |
560 | { | |
561 | struct bio *bio = bl->head; | |
562 | ||
563 | if (bio) { | |
564 | bl->head = bl->head->bi_next; | |
565 | if (!bl->head) | |
566 | bl->tail = NULL; | |
567 | ||
568 | bio->bi_next = NULL; | |
569 | } | |
570 | ||
571 | return bio; | |
572 | } | |
573 | ||
574 | static inline struct bio *bio_list_get(struct bio_list *bl) | |
575 | { | |
576 | struct bio *bio = bl->head; | |
577 | ||
578 | bl->head = bl->tail = NULL; | |
579 | ||
580 | return bio; | |
581 | } | |
582 | ||
57fb233f KO |
583 | /* |
584 | * bio_set is used to allow other portions of the IO system to | |
585 | * allocate their own private memory pools for bio and iovec structures. | |
586 | * These memory pools in turn all allocate from the bio_slab | |
587 | * and the bvec_slabs[]. | |
588 | */ | |
589 | #define BIO_POOL_SIZE 2 | |
590 | #define BIOVEC_NR_POOLS 6 | |
591 | #define BIOVEC_MAX_IDX (BIOVEC_NR_POOLS - 1) | |
592 | ||
593 | struct bio_set { | |
594 | struct kmem_cache *bio_slab; | |
595 | unsigned int front_pad; | |
596 | ||
597 | mempool_t *bio_pool; | |
9f060e22 | 598 | mempool_t *bvec_pool; |
57fb233f KO |
599 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
600 | mempool_t *bio_integrity_pool; | |
9f060e22 | 601 | mempool_t *bvec_integrity_pool; |
57fb233f | 602 | #endif |
df2cb6da KO |
603 | |
604 | /* | |
605 | * Deadlock avoidance for stacking block drivers: see comments in | |
606 | * bio_alloc_bioset() for details | |
607 | */ | |
608 | spinlock_t rescue_lock; | |
609 | struct bio_list rescue_list; | |
610 | struct work_struct rescue_work; | |
611 | struct workqueue_struct *rescue_workqueue; | |
57fb233f KO |
612 | }; |
613 | ||
614 | struct biovec_slab { | |
615 | int nr_vecs; | |
616 | char *name; | |
617 | struct kmem_cache *slab; | |
618 | }; | |
619 | ||
620 | /* | |
621 | * a small number of entries is fine, not going to be performance critical. | |
622 | * basically we just need to survive | |
623 | */ | |
624 | #define BIO_SPLIT_ENTRIES 2 | |
625 | ||
7ba1ba12 MP |
626 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
627 | ||
7ba1ba12 | 628 | |
7ba1ba12 | 629 | |
d57a5f7c KO |
630 | #define bip_vec_idx(bip, idx) (&(bip->bip_vec[(idx)])) |
631 | ||
632 | #define bip_for_each_vec(bvl, bip, iter) \ | |
633 | for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter) | |
7ba1ba12 | 634 | |
13f05c8d MP |
635 | #define bio_for_each_integrity_vec(_bvl, _bio, _iter) \ |
636 | for_each_bio(_bio) \ | |
637 | bip_for_each_vec(_bvl, _bio->bi_integrity, _iter) | |
638 | ||
8deaf721 | 639 | #define bio_integrity(bio) (bio->bi_integrity != NULL) |
7ba1ba12 | 640 | |
7ba1ba12 | 641 | extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int); |
1e2a410f | 642 | extern void bio_integrity_free(struct bio *); |
7ba1ba12 MP |
643 | extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int); |
644 | extern int bio_integrity_enabled(struct bio *bio); | |
645 | extern int bio_integrity_set_tag(struct bio *, void *, unsigned int); | |
646 | extern int bio_integrity_get_tag(struct bio *, void *, unsigned int); | |
647 | extern int bio_integrity_prep(struct bio *); | |
648 | extern void bio_integrity_endio(struct bio *, int); | |
649 | extern void bio_integrity_advance(struct bio *, unsigned int); | |
650 | extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int); | |
651 | extern void bio_integrity_split(struct bio *, struct bio_pair *, int); | |
1e2a410f | 652 | extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t); |
7878cba9 MP |
653 | extern int bioset_integrity_create(struct bio_set *, int); |
654 | extern void bioset_integrity_free(struct bio_set *); | |
655 | extern void bio_integrity_init(void); | |
7ba1ba12 MP |
656 | |
657 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
658 | ||
6898e3bd MP |
659 | static inline int bio_integrity(struct bio *bio) |
660 | { | |
661 | return 0; | |
662 | } | |
663 | ||
664 | static inline int bio_integrity_enabled(struct bio *bio) | |
665 | { | |
666 | return 0; | |
667 | } | |
668 | ||
669 | static inline int bioset_integrity_create(struct bio_set *bs, int pool_size) | |
670 | { | |
671 | return 0; | |
672 | } | |
673 | ||
674 | static inline void bioset_integrity_free (struct bio_set *bs) | |
675 | { | |
676 | return; | |
677 | } | |
678 | ||
679 | static inline int bio_integrity_prep(struct bio *bio) | |
680 | { | |
681 | return 0; | |
682 | } | |
683 | ||
1e2a410f | 684 | static inline void bio_integrity_free(struct bio *bio) |
6898e3bd MP |
685 | { |
686 | return; | |
687 | } | |
688 | ||
0c614e2d | 689 | static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
1e2a410f | 690 | gfp_t gfp_mask) |
0c614e2d SR |
691 | { |
692 | return 0; | |
693 | } | |
6898e3bd MP |
694 | |
695 | static inline void bio_integrity_split(struct bio *bio, struct bio_pair *bp, | |
696 | int sectors) | |
697 | { | |
698 | return; | |
699 | } | |
700 | ||
701 | static inline void bio_integrity_advance(struct bio *bio, | |
702 | unsigned int bytes_done) | |
703 | { | |
704 | return; | |
705 | } | |
706 | ||
707 | static inline void bio_integrity_trim(struct bio *bio, unsigned int offset, | |
708 | unsigned int sectors) | |
709 | { | |
710 | return; | |
711 | } | |
712 | ||
713 | static inline void bio_integrity_init(void) | |
714 | { | |
715 | return; | |
716 | } | |
7ba1ba12 MP |
717 | |
718 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
719 | ||
02a5e0ac | 720 | #endif /* CONFIG_BLOCK */ |
1da177e4 | 721 | #endif /* __LINUX_BIO_H */ |