Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Copyright (C) 2001 Jens Axboe <axboe@suse.de> |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
7cc01581 | 10 | * |
1da177e4 LT |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public Licens | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111- | |
17 | */ | |
18 | #ifndef __LINUX_BIO_H | |
19 | #define __LINUX_BIO_H | |
20 | ||
21 | #include <linux/highmem.h> | |
22 | #include <linux/mempool.h> | |
22e2c507 | 23 | #include <linux/ioprio.h> |
187f1882 | 24 | #include <linux/bug.h> |
1da177e4 | 25 | |
02a5e0ac DH |
26 | #ifdef CONFIG_BLOCK |
27 | ||
1da177e4 LT |
28 | #include <asm/io.h> |
29 | ||
7cc01581 TH |
30 | /* struct bio, bio_vec and BIO_* flags are defined in blk_types.h */ |
31 | #include <linux/blk_types.h> | |
32 | ||
1da177e4 LT |
33 | #define BIO_DEBUG |
34 | ||
35 | #ifdef BIO_DEBUG | |
36 | #define BIO_BUG_ON BUG_ON | |
37 | #else | |
38 | #define BIO_BUG_ON | |
39 | #endif | |
40 | ||
225311a4 HY |
41 | #ifdef CONFIG_THP_SWAP |
42 | #if HPAGE_PMD_NR > 256 | |
43 | #define BIO_MAX_PAGES HPAGE_PMD_NR | |
44 | #else | |
d84a8477 | 45 | #define BIO_MAX_PAGES 256 |
225311a4 HY |
46 | #endif |
47 | #else | |
48 | #define BIO_MAX_PAGES 256 | |
49 | #endif | |
1da177e4 | 50 | |
43b62ce3 MC |
51 | #define bio_prio(bio) (bio)->bi_ioprio |
52 | #define bio_set_prio(bio, prio) ((bio)->bi_ioprio = prio) | |
22e2c507 | 53 | |
4550dd6c KO |
54 | #define bio_iter_iovec(bio, iter) \ |
55 | bvec_iter_bvec((bio)->bi_io_vec, (iter)) | |
56 | ||
57 | #define bio_iter_page(bio, iter) \ | |
58 | bvec_iter_page((bio)->bi_io_vec, (iter)) | |
59 | #define bio_iter_len(bio, iter) \ | |
60 | bvec_iter_len((bio)->bi_io_vec, (iter)) | |
61 | #define bio_iter_offset(bio, iter) \ | |
62 | bvec_iter_offset((bio)->bi_io_vec, (iter)) | |
63 | ||
64 | #define bio_page(bio) bio_iter_page((bio), (bio)->bi_iter) | |
65 | #define bio_offset(bio) bio_iter_offset((bio), (bio)->bi_iter) | |
66 | #define bio_iovec(bio) bio_iter_iovec((bio), (bio)->bi_iter) | |
7988613b | 67 | |
458b76ed KO |
68 | #define bio_multiple_segments(bio) \ |
69 | ((bio)->bi_iter.bi_size != bio_iovec(bio).bv_len) | |
4f024f37 KO |
70 | #define bio_sectors(bio) ((bio)->bi_iter.bi_size >> 9) |
71 | #define bio_end_sector(bio) ((bio)->bi_iter.bi_sector + bio_sectors((bio))) | |
bf2de6f5 | 72 | |
d3849953 CH |
73 | /* |
74 | * Return the data direction, READ or WRITE. | |
75 | */ | |
76 | #define bio_data_dir(bio) \ | |
77 | (op_is_write(bio_op(bio)) ? WRITE : READ) | |
78 | ||
458b76ed KO |
79 | /* |
80 | * Check whether this bio carries any data or not. A NULL bio is allowed. | |
81 | */ | |
82 | static inline bool bio_has_data(struct bio *bio) | |
83 | { | |
84 | if (bio && | |
85 | bio->bi_iter.bi_size && | |
7afafc8a | 86 | bio_op(bio) != REQ_OP_DISCARD && |
a6f0788e CK |
87 | bio_op(bio) != REQ_OP_SECURE_ERASE && |
88 | bio_op(bio) != REQ_OP_WRITE_ZEROES) | |
458b76ed KO |
89 | return true; |
90 | ||
91 | return false; | |
92 | } | |
93 | ||
95fe6c1a MC |
94 | static inline bool bio_no_advance_iter(struct bio *bio) |
95 | { | |
7afafc8a AH |
96 | return bio_op(bio) == REQ_OP_DISCARD || |
97 | bio_op(bio) == REQ_OP_SECURE_ERASE || | |
a6f0788e CK |
98 | bio_op(bio) == REQ_OP_WRITE_SAME || |
99 | bio_op(bio) == REQ_OP_WRITE_ZEROES; | |
95fe6c1a MC |
100 | } |
101 | ||
458b76ed KO |
102 | static inline bool bio_mergeable(struct bio *bio) |
103 | { | |
1eff9d32 | 104 | if (bio->bi_opf & REQ_NOMERGE_FLAGS) |
458b76ed KO |
105 | return false; |
106 | ||
107 | return true; | |
108 | } | |
109 | ||
2e46e8b2 | 110 | static inline unsigned int bio_cur_bytes(struct bio *bio) |
bf2de6f5 | 111 | { |
458b76ed | 112 | if (bio_has_data(bio)) |
a4ad39b1 | 113 | return bio_iovec(bio).bv_len; |
fb2dce86 | 114 | else /* dataless requests such as discard */ |
4f024f37 | 115 | return bio->bi_iter.bi_size; |
bf2de6f5 JA |
116 | } |
117 | ||
118 | static inline void *bio_data(struct bio *bio) | |
119 | { | |
458b76ed | 120 | if (bio_has_data(bio)) |
bf2de6f5 JA |
121 | return page_address(bio_page(bio)) + bio_offset(bio); |
122 | ||
123 | return NULL; | |
124 | } | |
1da177e4 LT |
125 | |
126 | /* | |
127 | * will die | |
128 | */ | |
1da177e4 LT |
129 | #define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset) |
130 | ||
1da177e4 LT |
131 | /* |
132 | * merge helpers etc | |
133 | */ | |
134 | ||
f92131c3 JF |
135 | /* Default implementation of BIOVEC_PHYS_MERGEABLE */ |
136 | #define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ | |
137 | ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2))) | |
138 | ||
1da177e4 LT |
139 | /* |
140 | * allow arch override, for eg virtualized architectures (put in asm/io.h) | |
141 | */ | |
142 | #ifndef BIOVEC_PHYS_MERGEABLE | |
143 | #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ | |
f92131c3 | 144 | __BIOVEC_PHYS_MERGEABLE(vec1, vec2) |
1da177e4 LT |
145 | #endif |
146 | ||
1da177e4 LT |
147 | #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \ |
148 | (((addr1) | (mask)) == (((addr2) - 1) | (mask))) | |
149 | #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \ | |
ae03bf63 | 150 | __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q))) |
1da177e4 | 151 | |
d74c6d51 KO |
152 | /* |
153 | * drivers should _never_ use the all version - the bio may have been split | |
154 | * before it got to the driver and the driver won't own all of it | |
155 | */ | |
156 | #define bio_for_each_segment_all(bvl, bio, i) \ | |
f619d254 | 157 | for (i = 0, bvl = (bio)->bi_io_vec; i < (bio)->bi_vcnt; i++, bvl++) |
d74c6d51 | 158 | |
4550dd6c KO |
159 | static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter, |
160 | unsigned bytes) | |
161 | { | |
162 | iter->bi_sector += bytes >> 9; | |
163 | ||
f9df1cd9 | 164 | if (bio_no_advance_iter(bio)) { |
4550dd6c | 165 | iter->bi_size -= bytes; |
f9df1cd9 DM |
166 | iter->bi_done += bytes; |
167 | } else { | |
4550dd6c | 168 | bvec_iter_advance(bio->bi_io_vec, iter, bytes); |
b1fb2c52 DM |
169 | /* TODO: It is reasonable to complete bio with error here. */ |
170 | } | |
4550dd6c KO |
171 | } |
172 | ||
f9df1cd9 DM |
173 | static inline bool bio_rewind_iter(struct bio *bio, struct bvec_iter *iter, |
174 | unsigned int bytes) | |
175 | { | |
176 | iter->bi_sector -= bytes >> 9; | |
177 | ||
178 | if (bio_no_advance_iter(bio)) { | |
179 | iter->bi_size += bytes; | |
180 | iter->bi_done -= bytes; | |
181 | return true; | |
182 | } | |
183 | ||
184 | return bvec_iter_rewind(bio->bi_io_vec, iter, bytes); | |
185 | } | |
186 | ||
7988613b KO |
187 | #define __bio_for_each_segment(bvl, bio, iter, start) \ |
188 | for (iter = (start); \ | |
4550dd6c KO |
189 | (iter).bi_size && \ |
190 | ((bvl = bio_iter_iovec((bio), (iter))), 1); \ | |
191 | bio_advance_iter((bio), &(iter), (bvl).bv_len)) | |
7988613b KO |
192 | |
193 | #define bio_for_each_segment(bvl, bio, iter) \ | |
194 | __bio_for_each_segment(bvl, bio, iter, (bio)->bi_iter) | |
195 | ||
4550dd6c | 196 | #define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len) |
1da177e4 | 197 | |
f4595875 | 198 | static inline unsigned bio_segments(struct bio *bio) |
458b76ed KO |
199 | { |
200 | unsigned segs = 0; | |
201 | struct bio_vec bv; | |
202 | struct bvec_iter iter; | |
203 | ||
8423ae3d | 204 | /* |
a6f0788e CK |
205 | * We special case discard/write same/write zeroes, because they |
206 | * interpret bi_size differently: | |
8423ae3d KO |
207 | */ |
208 | ||
a6f0788e CK |
209 | switch (bio_op(bio)) { |
210 | case REQ_OP_DISCARD: | |
211 | case REQ_OP_SECURE_ERASE: | |
a6f0788e | 212 | case REQ_OP_WRITE_ZEROES: |
f9d03f96 CH |
213 | return 0; |
214 | case REQ_OP_WRITE_SAME: | |
8423ae3d | 215 | return 1; |
a6f0788e CK |
216 | default: |
217 | break; | |
218 | } | |
8423ae3d | 219 | |
f4595875 | 220 | bio_for_each_segment(bv, bio, iter) |
458b76ed KO |
221 | segs++; |
222 | ||
223 | return segs; | |
224 | } | |
225 | ||
1da177e4 LT |
226 | /* |
227 | * get a reference to a bio, so it won't disappear. the intended use is | |
228 | * something like: | |
229 | * | |
230 | * bio_get(bio); | |
231 | * submit_bio(rw, bio); | |
232 | * if (bio->bi_flags ...) | |
233 | * do_something | |
234 | * bio_put(bio); | |
235 | * | |
236 | * without the bio_get(), it could potentially complete I/O before submit_bio | |
237 | * returns. and then bio would be freed memory when if (bio->bi_flags ...) | |
238 | * runs | |
239 | */ | |
dac56212 JA |
240 | static inline void bio_get(struct bio *bio) |
241 | { | |
242 | bio->bi_flags |= (1 << BIO_REFFED); | |
243 | smp_mb__before_atomic(); | |
244 | atomic_inc(&bio->__bi_cnt); | |
245 | } | |
246 | ||
247 | static inline void bio_cnt_set(struct bio *bio, unsigned int count) | |
248 | { | |
249 | if (count != 1) { | |
250 | bio->bi_flags |= (1 << BIO_REFFED); | |
251 | smp_mb__before_atomic(); | |
252 | } | |
253 | atomic_set(&bio->__bi_cnt, count); | |
254 | } | |
1da177e4 | 255 | |
b7c44ed9 JA |
256 | static inline bool bio_flagged(struct bio *bio, unsigned int bit) |
257 | { | |
2c68f6dc | 258 | return (bio->bi_flags & (1U << bit)) != 0; |
b7c44ed9 JA |
259 | } |
260 | ||
261 | static inline void bio_set_flag(struct bio *bio, unsigned int bit) | |
262 | { | |
2c68f6dc | 263 | bio->bi_flags |= (1U << bit); |
b7c44ed9 JA |
264 | } |
265 | ||
266 | static inline void bio_clear_flag(struct bio *bio, unsigned int bit) | |
267 | { | |
2c68f6dc | 268 | bio->bi_flags &= ~(1U << bit); |
b7c44ed9 JA |
269 | } |
270 | ||
7bcd79ac ML |
271 | static inline void bio_get_first_bvec(struct bio *bio, struct bio_vec *bv) |
272 | { | |
273 | *bv = bio_iovec(bio); | |
274 | } | |
275 | ||
276 | static inline void bio_get_last_bvec(struct bio *bio, struct bio_vec *bv) | |
277 | { | |
278 | struct bvec_iter iter = bio->bi_iter; | |
279 | int idx; | |
280 | ||
7bcd79ac ML |
281 | if (unlikely(!bio_multiple_segments(bio))) { |
282 | *bv = bio_iovec(bio); | |
283 | return; | |
284 | } | |
285 | ||
286 | bio_advance_iter(bio, &iter, iter.bi_size); | |
287 | ||
288 | if (!iter.bi_bvec_done) | |
289 | idx = iter.bi_idx - 1; | |
290 | else /* in the middle of bvec */ | |
291 | idx = iter.bi_idx; | |
292 | ||
293 | *bv = bio->bi_io_vec[idx]; | |
294 | ||
295 | /* | |
296 | * iter.bi_bvec_done records actual length of the last bvec | |
297 | * if this bio ends in the middle of one io vector | |
298 | */ | |
299 | if (iter.bi_bvec_done) | |
300 | bv->bv_len = iter.bi_bvec_done; | |
301 | } | |
302 | ||
86292abc ML |
303 | static inline unsigned bio_pages_all(struct bio *bio) |
304 | { | |
305 | WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED)); | |
306 | return bio->bi_vcnt; | |
307 | } | |
308 | ||
309 | static inline struct bio_vec *bio_first_bvec_all(struct bio *bio) | |
310 | { | |
311 | WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED)); | |
312 | return bio->bi_io_vec; | |
313 | } | |
314 | ||
315 | static inline struct page *bio_first_page_all(struct bio *bio) | |
316 | { | |
317 | return bio_first_bvec_all(bio)->bv_page; | |
318 | } | |
319 | ||
320 | static inline struct bio_vec *bio_last_bvec_all(struct bio *bio) | |
321 | { | |
322 | WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED)); | |
323 | return &bio->bi_io_vec[bio->bi_vcnt - 1]; | |
324 | } | |
325 | ||
c611529e MP |
326 | enum bip_flags { |
327 | BIP_BLOCK_INTEGRITY = 1 << 0, /* block layer owns integrity data */ | |
328 | BIP_MAPPED_INTEGRITY = 1 << 1, /* ref tag has been remapped */ | |
329 | BIP_CTRL_NOCHECK = 1 << 2, /* disable HBA integrity checking */ | |
330 | BIP_DISK_NOCHECK = 1 << 3, /* disable disk integrity checking */ | |
331 | BIP_IP_CHECKSUM = 1 << 4, /* IP checksum */ | |
332 | }; | |
333 | ||
7ba1ba12 MP |
334 | /* |
335 | * bio integrity payload | |
336 | */ | |
337 | struct bio_integrity_payload { | |
338 | struct bio *bip_bio; /* parent bio */ | |
7ba1ba12 | 339 | |
d57a5f7c | 340 | struct bvec_iter bip_iter; |
7ba1ba12 | 341 | |
7878cba9 | 342 | unsigned short bip_slab; /* slab the bip came from */ |
7ba1ba12 | 343 | unsigned short bip_vcnt; /* # of integrity bio_vecs */ |
cbcd1054 | 344 | unsigned short bip_max_vcnt; /* integrity bio_vec slots */ |
b1f01388 | 345 | unsigned short bip_flags; /* control flags */ |
7ba1ba12 MP |
346 | |
347 | struct work_struct bip_work; /* I/O completion */ | |
6fda981c KO |
348 | |
349 | struct bio_vec *bip_vec; | |
350 | struct bio_vec bip_inline_vecs[0];/* embedded bvec array */ | |
7ba1ba12 | 351 | }; |
18593088 | 352 | |
06c1e390 KB |
353 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
354 | ||
355 | static inline struct bio_integrity_payload *bio_integrity(struct bio *bio) | |
356 | { | |
1eff9d32 | 357 | if (bio->bi_opf & REQ_INTEGRITY) |
06c1e390 KB |
358 | return bio->bi_integrity; |
359 | ||
360 | return NULL; | |
361 | } | |
362 | ||
c611529e MP |
363 | static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag) |
364 | { | |
365 | struct bio_integrity_payload *bip = bio_integrity(bio); | |
366 | ||
367 | if (bip) | |
368 | return bip->bip_flags & flag; | |
369 | ||
370 | return false; | |
371 | } | |
b1f01388 | 372 | |
18593088 MP |
373 | static inline sector_t bip_get_seed(struct bio_integrity_payload *bip) |
374 | { | |
375 | return bip->bip_iter.bi_sector; | |
376 | } | |
377 | ||
378 | static inline void bip_set_seed(struct bio_integrity_payload *bip, | |
379 | sector_t seed) | |
380 | { | |
381 | bip->bip_iter.bi_sector = seed; | |
382 | } | |
383 | ||
7ba1ba12 | 384 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
1da177e4 | 385 | |
6678d83f | 386 | extern void bio_trim(struct bio *bio, int offset, int size); |
20d0189b KO |
387 | extern struct bio *bio_split(struct bio *bio, int sectors, |
388 | gfp_t gfp, struct bio_set *bs); | |
389 | ||
390 | /** | |
391 | * bio_next_split - get next @sectors from a bio, splitting if necessary | |
392 | * @bio: bio to split | |
393 | * @sectors: number of sectors to split from the front of @bio | |
394 | * @gfp: gfp mask | |
395 | * @bs: bio set to allocate from | |
396 | * | |
397 | * Returns a bio representing the next @sectors of @bio - if the bio is smaller | |
398 | * than @sectors, returns the original bio unchanged. | |
399 | */ | |
400 | static inline struct bio *bio_next_split(struct bio *bio, int sectors, | |
401 | gfp_t gfp, struct bio_set *bs) | |
402 | { | |
403 | if (sectors >= bio_sectors(bio)) | |
404 | return bio; | |
405 | ||
406 | return bio_split(bio, sectors, gfp, bs); | |
407 | } | |
408 | ||
917a38c7 KO |
409 | extern int bioset_init(struct bio_set *, unsigned int, unsigned int, int flags); |
410 | extern void bioset_exit(struct bio_set *); | |
011067b0 N |
411 | extern struct bio_set *bioset_create(unsigned int, unsigned int, int flags); |
412 | enum { | |
413 | BIOSET_NEED_BVECS = BIT(0), | |
47e0fb46 | 414 | BIOSET_NEED_RESCUER = BIT(1), |
011067b0 | 415 | }; |
1da177e4 | 416 | extern void bioset_free(struct bio_set *); |
8aa6ba2f | 417 | extern int biovec_init_pool(mempool_t *pool, int pool_entries); |
1da177e4 | 418 | |
7a88fa19 | 419 | extern struct bio *bio_alloc_bioset(gfp_t, unsigned int, struct bio_set *); |
1da177e4 LT |
420 | extern void bio_put(struct bio *); |
421 | ||
59d276fe KO |
422 | extern void __bio_clone_fast(struct bio *, struct bio *); |
423 | extern struct bio *bio_clone_fast(struct bio *, gfp_t, struct bio_set *); | |
bf800ef1 KO |
424 | extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs); |
425 | ||
3f86a82a KO |
426 | extern struct bio_set *fs_bio_set; |
427 | ||
428 | static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) | |
429 | { | |
430 | return bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set); | |
431 | } | |
432 | ||
433 | static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs) | |
434 | { | |
435 | return bio_alloc_bioset(gfp_mask, nr_iovecs, NULL); | |
436 | } | |
437 | ||
bf800ef1 KO |
438 | static inline struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask) |
439 | { | |
440 | return bio_clone_bioset(bio, gfp_mask, NULL); | |
441 | ||
442 | } | |
443 | ||
1e3914d4 CH |
444 | extern blk_qc_t submit_bio(struct bio *); |
445 | ||
4246a0b6 CH |
446 | extern void bio_endio(struct bio *); |
447 | ||
448 | static inline void bio_io_error(struct bio *bio) | |
449 | { | |
4e4cbee9 | 450 | bio->bi_status = BLK_STS_IOERR; |
4246a0b6 CH |
451 | bio_endio(bio); |
452 | } | |
453 | ||
03a07c92 GR |
454 | static inline void bio_wouldblock_error(struct bio *bio) |
455 | { | |
456 | bio->bi_status = BLK_STS_AGAIN; | |
4246a0b6 CH |
457 | bio_endio(bio); |
458 | } | |
459 | ||
1da177e4 LT |
460 | struct request_queue; |
461 | extern int bio_phys_segments(struct request_queue *, struct bio *); | |
1da177e4 | 462 | |
4e49ea4a | 463 | extern int submit_bio_wait(struct bio *bio); |
054bdf64 KO |
464 | extern void bio_advance(struct bio *, unsigned); |
465 | ||
3a83f467 ML |
466 | extern void bio_init(struct bio *bio, struct bio_vec *table, |
467 | unsigned short max_vecs); | |
9ae3b3f5 | 468 | extern void bio_uninit(struct bio *); |
f44b48c7 | 469 | extern void bio_reset(struct bio *); |
196d38bc | 470 | void bio_chain(struct bio *, struct bio *); |
1da177e4 LT |
471 | |
472 | extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int); | |
6e68af66 MC |
473 | extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *, |
474 | unsigned int, unsigned int); | |
2cefe4db | 475 | int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter); |
152e283f | 476 | struct rq_map_data; |
f1970baf | 477 | extern struct bio *bio_map_user_iov(struct request_queue *, |
e81cef5d | 478 | struct iov_iter *, gfp_t); |
1da177e4 | 479 | extern void bio_unmap_user(struct bio *); |
df46b9a4 | 480 | extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int, |
27496a8c | 481 | gfp_t); |
68154e90 FT |
482 | extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int, |
483 | gfp_t, int); | |
1da177e4 LT |
484 | extern void bio_set_pages_dirty(struct bio *bio); |
485 | extern void bio_check_pages_dirty(struct bio *bio); | |
2d4dc890 | 486 | |
d62e26b3 JA |
487 | void generic_start_io_acct(struct request_queue *q, int rw, |
488 | unsigned long sectors, struct hd_struct *part); | |
489 | void generic_end_io_acct(struct request_queue *q, int rw, | |
490 | struct hd_struct *part, | |
491 | unsigned long start_time); | |
394ffa50 | 492 | |
2d4dc890 IL |
493 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
494 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
495 | #endif | |
496 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
497 | extern void bio_flush_dcache_pages(struct bio *bi); | |
498 | #else | |
499 | static inline void bio_flush_dcache_pages(struct bio *bi) | |
500 | { | |
501 | } | |
502 | #endif | |
503 | ||
16ac3d63 | 504 | extern void bio_copy_data(struct bio *dst, struct bio *src); |
491221f8 | 505 | extern void bio_free_pages(struct bio *bio); |
16ac3d63 | 506 | |
152e283f | 507 | extern struct bio *bio_copy_user_iov(struct request_queue *, |
86d564c8 | 508 | struct rq_map_data *, |
e81cef5d | 509 | struct iov_iter *, |
26e49cfc | 510 | gfp_t); |
1da177e4 LT |
511 | extern int bio_uncopy_user(struct bio *); |
512 | void zero_fill_bio(struct bio *bio); | |
9f060e22 KO |
513 | extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *); |
514 | extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int); | |
7ba1ba12 | 515 | extern unsigned int bvec_nr_vecs(unsigned short idx); |
9c0fb1e3 | 516 | extern const char *bio_devname(struct bio *bio, char *buffer); |
51d654e1 | 517 | |
74d46992 CH |
518 | #define bio_set_dev(bio, bdev) \ |
519 | do { \ | |
111be883 SL |
520 | if ((bio)->bi_disk != (bdev)->bd_disk) \ |
521 | bio_clear_flag(bio, BIO_THROTTLED);\ | |
74d46992 CH |
522 | (bio)->bi_disk = (bdev)->bd_disk; \ |
523 | (bio)->bi_partno = (bdev)->bd_partno; \ | |
524 | } while (0) | |
525 | ||
526 | #define bio_copy_dev(dst, src) \ | |
527 | do { \ | |
528 | (dst)->bi_disk = (src)->bi_disk; \ | |
529 | (dst)->bi_partno = (src)->bi_partno; \ | |
530 | } while (0) | |
531 | ||
532 | #define bio_dev(bio) \ | |
533 | disk_devt((bio)->bi_disk) | |
534 | ||
852c788f | 535 | #ifdef CONFIG_BLK_CGROUP |
1d933cf0 | 536 | int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css); |
852c788f | 537 | void bio_disassociate_task(struct bio *bio); |
20bd723e | 538 | void bio_clone_blkcg_association(struct bio *dst, struct bio *src); |
852c788f | 539 | #else /* CONFIG_BLK_CGROUP */ |
1d933cf0 TH |
540 | static inline int bio_associate_blkcg(struct bio *bio, |
541 | struct cgroup_subsys_state *blkcg_css) { return 0; } | |
852c788f | 542 | static inline void bio_disassociate_task(struct bio *bio) { } |
20bd723e PV |
543 | static inline void bio_clone_blkcg_association(struct bio *dst, |
544 | struct bio *src) { } | |
852c788f TH |
545 | #endif /* CONFIG_BLK_CGROUP */ |
546 | ||
1da177e4 LT |
547 | #ifdef CONFIG_HIGHMEM |
548 | /* | |
20b636bf AB |
549 | * remember never ever reenable interrupts between a bvec_kmap_irq and |
550 | * bvec_kunmap_irq! | |
1da177e4 | 551 | */ |
4f570f99 | 552 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
1da177e4 LT |
553 | { |
554 | unsigned long addr; | |
555 | ||
556 | /* | |
557 | * might not be a highmem page, but the preempt/irq count | |
558 | * balancing is a lot nicer this way | |
559 | */ | |
560 | local_irq_save(*flags); | |
e8e3c3d6 | 561 | addr = (unsigned long) kmap_atomic(bvec->bv_page); |
1da177e4 LT |
562 | |
563 | BUG_ON(addr & ~PAGE_MASK); | |
564 | ||
565 | return (char *) addr + bvec->bv_offset; | |
566 | } | |
567 | ||
4f570f99 | 568 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) |
1da177e4 LT |
569 | { |
570 | unsigned long ptr = (unsigned long) buffer & PAGE_MASK; | |
571 | ||
e8e3c3d6 | 572 | kunmap_atomic((void *) ptr); |
1da177e4 LT |
573 | local_irq_restore(*flags); |
574 | } | |
575 | ||
576 | #else | |
11a691be GU |
577 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
578 | { | |
579 | return page_address(bvec->bv_page) + bvec->bv_offset; | |
580 | } | |
581 | ||
582 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) | |
583 | { | |
584 | *flags = 0; | |
585 | } | |
1da177e4 LT |
586 | #endif |
587 | ||
8f3d8ba2 | 588 | /* |
e686307f | 589 | * BIO list management for use by remapping drivers (e.g. DM or MD) and loop. |
8f3d8ba2 CH |
590 | * |
591 | * A bio_list anchors a singly-linked list of bios chained through the bi_next | |
592 | * member of the bio. The bio_list also caches the last list member to allow | |
593 | * fast access to the tail. | |
594 | */ | |
595 | struct bio_list { | |
596 | struct bio *head; | |
597 | struct bio *tail; | |
598 | }; | |
599 | ||
600 | static inline int bio_list_empty(const struct bio_list *bl) | |
601 | { | |
602 | return bl->head == NULL; | |
603 | } | |
604 | ||
605 | static inline void bio_list_init(struct bio_list *bl) | |
606 | { | |
607 | bl->head = bl->tail = NULL; | |
608 | } | |
609 | ||
320ae51f JA |
610 | #define BIO_EMPTY_LIST { NULL, NULL } |
611 | ||
8f3d8ba2 CH |
612 | #define bio_list_for_each(bio, bl) \ |
613 | for (bio = (bl)->head; bio; bio = bio->bi_next) | |
614 | ||
615 | static inline unsigned bio_list_size(const struct bio_list *bl) | |
616 | { | |
617 | unsigned sz = 0; | |
618 | struct bio *bio; | |
619 | ||
620 | bio_list_for_each(bio, bl) | |
621 | sz++; | |
622 | ||
623 | return sz; | |
624 | } | |
625 | ||
626 | static inline void bio_list_add(struct bio_list *bl, struct bio *bio) | |
627 | { | |
628 | bio->bi_next = NULL; | |
629 | ||
630 | if (bl->tail) | |
631 | bl->tail->bi_next = bio; | |
632 | else | |
633 | bl->head = bio; | |
634 | ||
635 | bl->tail = bio; | |
636 | } | |
637 | ||
638 | static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio) | |
639 | { | |
640 | bio->bi_next = bl->head; | |
641 | ||
642 | bl->head = bio; | |
643 | ||
644 | if (!bl->tail) | |
645 | bl->tail = bio; | |
646 | } | |
647 | ||
648 | static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2) | |
649 | { | |
650 | if (!bl2->head) | |
651 | return; | |
652 | ||
653 | if (bl->tail) | |
654 | bl->tail->bi_next = bl2->head; | |
655 | else | |
656 | bl->head = bl2->head; | |
657 | ||
658 | bl->tail = bl2->tail; | |
659 | } | |
660 | ||
661 | static inline void bio_list_merge_head(struct bio_list *bl, | |
662 | struct bio_list *bl2) | |
663 | { | |
664 | if (!bl2->head) | |
665 | return; | |
666 | ||
667 | if (bl->head) | |
668 | bl2->tail->bi_next = bl->head; | |
669 | else | |
670 | bl->tail = bl2->tail; | |
671 | ||
672 | bl->head = bl2->head; | |
673 | } | |
674 | ||
13685a16 GU |
675 | static inline struct bio *bio_list_peek(struct bio_list *bl) |
676 | { | |
677 | return bl->head; | |
678 | } | |
679 | ||
8f3d8ba2 CH |
680 | static inline struct bio *bio_list_pop(struct bio_list *bl) |
681 | { | |
682 | struct bio *bio = bl->head; | |
683 | ||
684 | if (bio) { | |
685 | bl->head = bl->head->bi_next; | |
686 | if (!bl->head) | |
687 | bl->tail = NULL; | |
688 | ||
689 | bio->bi_next = NULL; | |
690 | } | |
691 | ||
692 | return bio; | |
693 | } | |
694 | ||
695 | static inline struct bio *bio_list_get(struct bio_list *bl) | |
696 | { | |
697 | struct bio *bio = bl->head; | |
698 | ||
699 | bl->head = bl->tail = NULL; | |
700 | ||
701 | return bio; | |
702 | } | |
703 | ||
0ef5a50c MS |
704 | /* |
705 | * Increment chain count for the bio. Make sure the CHAIN flag update | |
706 | * is visible before the raised count. | |
707 | */ | |
708 | static inline void bio_inc_remaining(struct bio *bio) | |
709 | { | |
710 | bio_set_flag(bio, BIO_CHAIN); | |
711 | smp_mb__before_atomic(); | |
712 | atomic_inc(&bio->__bi_remaining); | |
713 | } | |
714 | ||
57fb233f KO |
715 | /* |
716 | * bio_set is used to allow other portions of the IO system to | |
717 | * allocate their own private memory pools for bio and iovec structures. | |
718 | * These memory pools in turn all allocate from the bio_slab | |
719 | * and the bvec_slabs[]. | |
720 | */ | |
721 | #define BIO_POOL_SIZE 2 | |
57fb233f KO |
722 | |
723 | struct bio_set { | |
724 | struct kmem_cache *bio_slab; | |
725 | unsigned int front_pad; | |
726 | ||
8aa6ba2f KO |
727 | mempool_t bio_pool; |
728 | mempool_t bvec_pool; | |
57fb233f | 729 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
8aa6ba2f KO |
730 | mempool_t bio_integrity_pool; |
731 | mempool_t bvec_integrity_pool; | |
57fb233f | 732 | #endif |
df2cb6da KO |
733 | |
734 | /* | |
735 | * Deadlock avoidance for stacking block drivers: see comments in | |
736 | * bio_alloc_bioset() for details | |
737 | */ | |
738 | spinlock_t rescue_lock; | |
739 | struct bio_list rescue_list; | |
740 | struct work_struct rescue_work; | |
741 | struct workqueue_struct *rescue_workqueue; | |
57fb233f KO |
742 | }; |
743 | ||
744 | struct biovec_slab { | |
745 | int nr_vecs; | |
746 | char *name; | |
747 | struct kmem_cache *slab; | |
748 | }; | |
749 | ||
750 | /* | |
751 | * a small number of entries is fine, not going to be performance critical. | |
752 | * basically we just need to survive | |
753 | */ | |
754 | #define BIO_SPLIT_ENTRIES 2 | |
755 | ||
7ba1ba12 MP |
756 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
757 | ||
d57a5f7c KO |
758 | #define bip_for_each_vec(bvl, bip, iter) \ |
759 | for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter) | |
7ba1ba12 | 760 | |
13f05c8d MP |
761 | #define bio_for_each_integrity_vec(_bvl, _bio, _iter) \ |
762 | for_each_bio(_bio) \ | |
763 | bip_for_each_vec(_bvl, _bio->bi_integrity, _iter) | |
764 | ||
7ba1ba12 | 765 | extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int); |
7ba1ba12 | 766 | extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int); |
e23947bd | 767 | extern bool bio_integrity_prep(struct bio *); |
7ba1ba12 | 768 | extern void bio_integrity_advance(struct bio *, unsigned int); |
fbd08e76 | 769 | extern void bio_integrity_trim(struct bio *); |
1e2a410f | 770 | extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t); |
7878cba9 MP |
771 | extern int bioset_integrity_create(struct bio_set *, int); |
772 | extern void bioset_integrity_free(struct bio_set *); | |
773 | extern void bio_integrity_init(void); | |
7ba1ba12 MP |
774 | |
775 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
776 | ||
c611529e | 777 | static inline void *bio_integrity(struct bio *bio) |
6898e3bd | 778 | { |
c611529e | 779 | return NULL; |
6898e3bd MP |
780 | } |
781 | ||
6898e3bd MP |
782 | static inline int bioset_integrity_create(struct bio_set *bs, int pool_size) |
783 | { | |
784 | return 0; | |
785 | } | |
786 | ||
787 | static inline void bioset_integrity_free (struct bio_set *bs) | |
788 | { | |
789 | return; | |
790 | } | |
791 | ||
e23947bd | 792 | static inline bool bio_integrity_prep(struct bio *bio) |
6898e3bd | 793 | { |
e23947bd | 794 | return true; |
6898e3bd MP |
795 | } |
796 | ||
0c614e2d | 797 | static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
1e2a410f | 798 | gfp_t gfp_mask) |
0c614e2d SR |
799 | { |
800 | return 0; | |
801 | } | |
6898e3bd | 802 | |
6898e3bd MP |
803 | static inline void bio_integrity_advance(struct bio *bio, |
804 | unsigned int bytes_done) | |
805 | { | |
806 | return; | |
807 | } | |
808 | ||
fbd08e76 | 809 | static inline void bio_integrity_trim(struct bio *bio) |
6898e3bd MP |
810 | { |
811 | return; | |
812 | } | |
813 | ||
814 | static inline void bio_integrity_init(void) | |
815 | { | |
816 | return; | |
817 | } | |
7ba1ba12 | 818 | |
c611529e MP |
819 | static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag) |
820 | { | |
821 | return false; | |
822 | } | |
823 | ||
06c1e390 KB |
824 | static inline void *bio_integrity_alloc(struct bio * bio, gfp_t gfp, |
825 | unsigned int nr) | |
826 | { | |
827 | return ERR_PTR(-EINVAL); | |
828 | } | |
829 | ||
830 | static inline int bio_integrity_add_page(struct bio *bio, struct page *page, | |
831 | unsigned int len, unsigned int offset) | |
832 | { | |
833 | return 0; | |
834 | } | |
835 | ||
7ba1ba12 MP |
836 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
837 | ||
02a5e0ac | 838 | #endif /* CONFIG_BLOCK */ |
1da177e4 | 839 | #endif /* __LINUX_BIO_H */ |