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) | |
38a72dac KO |
70 | |
71 | #define bvec_iter_sectors(iter) ((iter).bi_size >> 9) | |
72 | #define bvec_iter_end_sector(iter) ((iter).bi_sector + bvec_iter_sectors((iter))) | |
73 | ||
74 | #define bio_sectors(bio) bvec_iter_sectors((bio)->bi_iter) | |
75 | #define bio_end_sector(bio) bvec_iter_end_sector((bio)->bi_iter) | |
bf2de6f5 | 76 | |
d3849953 CH |
77 | /* |
78 | * Return the data direction, READ or WRITE. | |
79 | */ | |
80 | #define bio_data_dir(bio) \ | |
81 | (op_is_write(bio_op(bio)) ? WRITE : READ) | |
82 | ||
458b76ed KO |
83 | /* |
84 | * Check whether this bio carries any data or not. A NULL bio is allowed. | |
85 | */ | |
86 | static inline bool bio_has_data(struct bio *bio) | |
87 | { | |
88 | if (bio && | |
89 | bio->bi_iter.bi_size && | |
7afafc8a | 90 | bio_op(bio) != REQ_OP_DISCARD && |
a6f0788e CK |
91 | bio_op(bio) != REQ_OP_SECURE_ERASE && |
92 | bio_op(bio) != REQ_OP_WRITE_ZEROES) | |
458b76ed KO |
93 | return true; |
94 | ||
95 | return false; | |
96 | } | |
97 | ||
95fe6c1a MC |
98 | static inline bool bio_no_advance_iter(struct bio *bio) |
99 | { | |
7afafc8a AH |
100 | return bio_op(bio) == REQ_OP_DISCARD || |
101 | bio_op(bio) == REQ_OP_SECURE_ERASE || | |
a6f0788e CK |
102 | bio_op(bio) == REQ_OP_WRITE_SAME || |
103 | bio_op(bio) == REQ_OP_WRITE_ZEROES; | |
95fe6c1a MC |
104 | } |
105 | ||
458b76ed KO |
106 | static inline bool bio_mergeable(struct bio *bio) |
107 | { | |
1eff9d32 | 108 | if (bio->bi_opf & REQ_NOMERGE_FLAGS) |
458b76ed KO |
109 | return false; |
110 | ||
111 | return true; | |
112 | } | |
113 | ||
2e46e8b2 | 114 | static inline unsigned int bio_cur_bytes(struct bio *bio) |
bf2de6f5 | 115 | { |
458b76ed | 116 | if (bio_has_data(bio)) |
a4ad39b1 | 117 | return bio_iovec(bio).bv_len; |
fb2dce86 | 118 | else /* dataless requests such as discard */ |
4f024f37 | 119 | return bio->bi_iter.bi_size; |
bf2de6f5 JA |
120 | } |
121 | ||
122 | static inline void *bio_data(struct bio *bio) | |
123 | { | |
458b76ed | 124 | if (bio_has_data(bio)) |
bf2de6f5 JA |
125 | return page_address(bio_page(bio)) + bio_offset(bio); |
126 | ||
127 | return NULL; | |
128 | } | |
1da177e4 LT |
129 | |
130 | /* | |
131 | * will die | |
132 | */ | |
1da177e4 LT |
133 | #define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset) |
134 | ||
1da177e4 LT |
135 | /* |
136 | * merge helpers etc | |
137 | */ | |
138 | ||
f92131c3 JF |
139 | /* Default implementation of BIOVEC_PHYS_MERGEABLE */ |
140 | #define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ | |
141 | ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2))) | |
142 | ||
1da177e4 LT |
143 | /* |
144 | * allow arch override, for eg virtualized architectures (put in asm/io.h) | |
145 | */ | |
146 | #ifndef BIOVEC_PHYS_MERGEABLE | |
147 | #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ | |
f92131c3 | 148 | __BIOVEC_PHYS_MERGEABLE(vec1, vec2) |
1da177e4 LT |
149 | #endif |
150 | ||
1da177e4 LT |
151 | #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \ |
152 | (((addr1) | (mask)) == (((addr2) - 1) | (mask))) | |
153 | #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \ | |
ae03bf63 | 154 | __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q))) |
1da177e4 | 155 | |
d74c6d51 KO |
156 | /* |
157 | * drivers should _never_ use the all version - the bio may have been split | |
158 | * before it got to the driver and the driver won't own all of it | |
159 | */ | |
160 | #define bio_for_each_segment_all(bvl, bio, i) \ | |
f619d254 | 161 | for (i = 0, bvl = (bio)->bi_io_vec; i < (bio)->bi_vcnt; i++, bvl++) |
d74c6d51 | 162 | |
4550dd6c KO |
163 | static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter, |
164 | unsigned bytes) | |
165 | { | |
166 | iter->bi_sector += bytes >> 9; | |
167 | ||
f9df1cd9 | 168 | if (bio_no_advance_iter(bio)) { |
4550dd6c | 169 | iter->bi_size -= bytes; |
f9df1cd9 DM |
170 | iter->bi_done += bytes; |
171 | } else { | |
4550dd6c | 172 | bvec_iter_advance(bio->bi_io_vec, iter, bytes); |
b1fb2c52 DM |
173 | /* TODO: It is reasonable to complete bio with error here. */ |
174 | } | |
4550dd6c KO |
175 | } |
176 | ||
f9df1cd9 DM |
177 | static inline bool bio_rewind_iter(struct bio *bio, struct bvec_iter *iter, |
178 | unsigned int bytes) | |
179 | { | |
180 | iter->bi_sector -= bytes >> 9; | |
181 | ||
182 | if (bio_no_advance_iter(bio)) { | |
183 | iter->bi_size += bytes; | |
184 | iter->bi_done -= bytes; | |
185 | return true; | |
186 | } | |
187 | ||
188 | return bvec_iter_rewind(bio->bi_io_vec, iter, bytes); | |
189 | } | |
190 | ||
7988613b KO |
191 | #define __bio_for_each_segment(bvl, bio, iter, start) \ |
192 | for (iter = (start); \ | |
4550dd6c KO |
193 | (iter).bi_size && \ |
194 | ((bvl = bio_iter_iovec((bio), (iter))), 1); \ | |
195 | bio_advance_iter((bio), &(iter), (bvl).bv_len)) | |
7988613b KO |
196 | |
197 | #define bio_for_each_segment(bvl, bio, iter) \ | |
198 | __bio_for_each_segment(bvl, bio, iter, (bio)->bi_iter) | |
199 | ||
4550dd6c | 200 | #define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len) |
1da177e4 | 201 | |
f4595875 | 202 | static inline unsigned bio_segments(struct bio *bio) |
458b76ed KO |
203 | { |
204 | unsigned segs = 0; | |
205 | struct bio_vec bv; | |
206 | struct bvec_iter iter; | |
207 | ||
8423ae3d | 208 | /* |
a6f0788e CK |
209 | * We special case discard/write same/write zeroes, because they |
210 | * interpret bi_size differently: | |
8423ae3d KO |
211 | */ |
212 | ||
a6f0788e CK |
213 | switch (bio_op(bio)) { |
214 | case REQ_OP_DISCARD: | |
215 | case REQ_OP_SECURE_ERASE: | |
a6f0788e | 216 | case REQ_OP_WRITE_ZEROES: |
f9d03f96 CH |
217 | return 0; |
218 | case REQ_OP_WRITE_SAME: | |
8423ae3d | 219 | return 1; |
a6f0788e CK |
220 | default: |
221 | break; | |
222 | } | |
8423ae3d | 223 | |
f4595875 | 224 | bio_for_each_segment(bv, bio, iter) |
458b76ed KO |
225 | segs++; |
226 | ||
227 | return segs; | |
228 | } | |
229 | ||
1da177e4 LT |
230 | /* |
231 | * get a reference to a bio, so it won't disappear. the intended use is | |
232 | * something like: | |
233 | * | |
234 | * bio_get(bio); | |
235 | * submit_bio(rw, bio); | |
236 | * if (bio->bi_flags ...) | |
237 | * do_something | |
238 | * bio_put(bio); | |
239 | * | |
240 | * without the bio_get(), it could potentially complete I/O before submit_bio | |
241 | * returns. and then bio would be freed memory when if (bio->bi_flags ...) | |
242 | * runs | |
243 | */ | |
dac56212 JA |
244 | static inline void bio_get(struct bio *bio) |
245 | { | |
246 | bio->bi_flags |= (1 << BIO_REFFED); | |
247 | smp_mb__before_atomic(); | |
248 | atomic_inc(&bio->__bi_cnt); | |
249 | } | |
250 | ||
251 | static inline void bio_cnt_set(struct bio *bio, unsigned int count) | |
252 | { | |
253 | if (count != 1) { | |
254 | bio->bi_flags |= (1 << BIO_REFFED); | |
255 | smp_mb__before_atomic(); | |
256 | } | |
257 | atomic_set(&bio->__bi_cnt, count); | |
258 | } | |
1da177e4 | 259 | |
b7c44ed9 JA |
260 | static inline bool bio_flagged(struct bio *bio, unsigned int bit) |
261 | { | |
2c68f6dc | 262 | return (bio->bi_flags & (1U << bit)) != 0; |
b7c44ed9 JA |
263 | } |
264 | ||
265 | static inline void bio_set_flag(struct bio *bio, unsigned int bit) | |
266 | { | |
2c68f6dc | 267 | bio->bi_flags |= (1U << bit); |
b7c44ed9 JA |
268 | } |
269 | ||
270 | static inline void bio_clear_flag(struct bio *bio, unsigned int bit) | |
271 | { | |
2c68f6dc | 272 | bio->bi_flags &= ~(1U << bit); |
b7c44ed9 JA |
273 | } |
274 | ||
7bcd79ac ML |
275 | static inline void bio_get_first_bvec(struct bio *bio, struct bio_vec *bv) |
276 | { | |
277 | *bv = bio_iovec(bio); | |
278 | } | |
279 | ||
280 | static inline void bio_get_last_bvec(struct bio *bio, struct bio_vec *bv) | |
281 | { | |
282 | struct bvec_iter iter = bio->bi_iter; | |
283 | int idx; | |
284 | ||
7bcd79ac ML |
285 | if (unlikely(!bio_multiple_segments(bio))) { |
286 | *bv = bio_iovec(bio); | |
287 | return; | |
288 | } | |
289 | ||
290 | bio_advance_iter(bio, &iter, iter.bi_size); | |
291 | ||
292 | if (!iter.bi_bvec_done) | |
293 | idx = iter.bi_idx - 1; | |
294 | else /* in the middle of bvec */ | |
295 | idx = iter.bi_idx; | |
296 | ||
297 | *bv = bio->bi_io_vec[idx]; | |
298 | ||
299 | /* | |
300 | * iter.bi_bvec_done records actual length of the last bvec | |
301 | * if this bio ends in the middle of one io vector | |
302 | */ | |
303 | if (iter.bi_bvec_done) | |
304 | bv->bv_len = iter.bi_bvec_done; | |
305 | } | |
306 | ||
86292abc ML |
307 | static inline unsigned bio_pages_all(struct bio *bio) |
308 | { | |
309 | WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED)); | |
310 | return bio->bi_vcnt; | |
311 | } | |
312 | ||
313 | static inline struct bio_vec *bio_first_bvec_all(struct bio *bio) | |
314 | { | |
315 | WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED)); | |
316 | return bio->bi_io_vec; | |
317 | } | |
318 | ||
319 | static inline struct page *bio_first_page_all(struct bio *bio) | |
320 | { | |
321 | return bio_first_bvec_all(bio)->bv_page; | |
322 | } | |
323 | ||
324 | static inline struct bio_vec *bio_last_bvec_all(struct bio *bio) | |
325 | { | |
326 | WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED)); | |
327 | return &bio->bi_io_vec[bio->bi_vcnt - 1]; | |
328 | } | |
329 | ||
c611529e MP |
330 | enum bip_flags { |
331 | BIP_BLOCK_INTEGRITY = 1 << 0, /* block layer owns integrity data */ | |
332 | BIP_MAPPED_INTEGRITY = 1 << 1, /* ref tag has been remapped */ | |
333 | BIP_CTRL_NOCHECK = 1 << 2, /* disable HBA integrity checking */ | |
334 | BIP_DISK_NOCHECK = 1 << 3, /* disable disk integrity checking */ | |
335 | BIP_IP_CHECKSUM = 1 << 4, /* IP checksum */ | |
336 | }; | |
337 | ||
7ba1ba12 MP |
338 | /* |
339 | * bio integrity payload | |
340 | */ | |
341 | struct bio_integrity_payload { | |
342 | struct bio *bip_bio; /* parent bio */ | |
7ba1ba12 | 343 | |
d57a5f7c | 344 | struct bvec_iter bip_iter; |
7ba1ba12 | 345 | |
7878cba9 | 346 | unsigned short bip_slab; /* slab the bip came from */ |
7ba1ba12 | 347 | unsigned short bip_vcnt; /* # of integrity bio_vecs */ |
cbcd1054 | 348 | unsigned short bip_max_vcnt; /* integrity bio_vec slots */ |
b1f01388 | 349 | unsigned short bip_flags; /* control flags */ |
7ba1ba12 MP |
350 | |
351 | struct work_struct bip_work; /* I/O completion */ | |
6fda981c KO |
352 | |
353 | struct bio_vec *bip_vec; | |
354 | struct bio_vec bip_inline_vecs[0];/* embedded bvec array */ | |
7ba1ba12 | 355 | }; |
18593088 | 356 | |
06c1e390 KB |
357 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
358 | ||
359 | static inline struct bio_integrity_payload *bio_integrity(struct bio *bio) | |
360 | { | |
1eff9d32 | 361 | if (bio->bi_opf & REQ_INTEGRITY) |
06c1e390 KB |
362 | return bio->bi_integrity; |
363 | ||
364 | return NULL; | |
365 | } | |
366 | ||
c611529e MP |
367 | static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag) |
368 | { | |
369 | struct bio_integrity_payload *bip = bio_integrity(bio); | |
370 | ||
371 | if (bip) | |
372 | return bip->bip_flags & flag; | |
373 | ||
374 | return false; | |
375 | } | |
b1f01388 | 376 | |
18593088 MP |
377 | static inline sector_t bip_get_seed(struct bio_integrity_payload *bip) |
378 | { | |
379 | return bip->bip_iter.bi_sector; | |
380 | } | |
381 | ||
382 | static inline void bip_set_seed(struct bio_integrity_payload *bip, | |
383 | sector_t seed) | |
384 | { | |
385 | bip->bip_iter.bi_sector = seed; | |
386 | } | |
387 | ||
7ba1ba12 | 388 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
1da177e4 | 389 | |
6678d83f | 390 | extern void bio_trim(struct bio *bio, int offset, int size); |
20d0189b KO |
391 | extern struct bio *bio_split(struct bio *bio, int sectors, |
392 | gfp_t gfp, struct bio_set *bs); | |
393 | ||
394 | /** | |
395 | * bio_next_split - get next @sectors from a bio, splitting if necessary | |
396 | * @bio: bio to split | |
397 | * @sectors: number of sectors to split from the front of @bio | |
398 | * @gfp: gfp mask | |
399 | * @bs: bio set to allocate from | |
400 | * | |
401 | * Returns a bio representing the next @sectors of @bio - if the bio is smaller | |
402 | * than @sectors, returns the original bio unchanged. | |
403 | */ | |
404 | static inline struct bio *bio_next_split(struct bio *bio, int sectors, | |
405 | gfp_t gfp, struct bio_set *bs) | |
406 | { | |
407 | if (sectors >= bio_sectors(bio)) | |
408 | return bio; | |
409 | ||
410 | return bio_split(bio, sectors, gfp, bs); | |
411 | } | |
412 | ||
011067b0 N |
413 | enum { |
414 | BIOSET_NEED_BVECS = BIT(0), | |
47e0fb46 | 415 | BIOSET_NEED_RESCUER = BIT(1), |
011067b0 | 416 | }; |
dad08527 KO |
417 | extern int bioset_init(struct bio_set *, unsigned int, unsigned int, int flags); |
418 | extern void bioset_exit(struct bio_set *); | |
8aa6ba2f | 419 | extern int biovec_init_pool(mempool_t *pool, int pool_entries); |
1da177e4 | 420 | |
7a88fa19 | 421 | extern struct bio *bio_alloc_bioset(gfp_t, unsigned int, struct bio_set *); |
1da177e4 LT |
422 | extern void bio_put(struct bio *); |
423 | ||
59d276fe KO |
424 | extern void __bio_clone_fast(struct bio *, struct bio *); |
425 | extern struct bio *bio_clone_fast(struct bio *, gfp_t, struct bio_set *); | |
bf800ef1 KO |
426 | extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs); |
427 | ||
f4f8154a | 428 | extern struct bio_set fs_bio_set; |
3f86a82a KO |
429 | |
430 | static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) | |
431 | { | |
f4f8154a | 432 | return bio_alloc_bioset(gfp_mask, nr_iovecs, &fs_bio_set); |
3f86a82a KO |
433 | } |
434 | ||
435 | static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs) | |
436 | { | |
437 | return bio_alloc_bioset(gfp_mask, nr_iovecs, NULL); | |
438 | } | |
439 | ||
bf800ef1 KO |
440 | static inline struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask) |
441 | { | |
442 | return bio_clone_bioset(bio, gfp_mask, NULL); | |
443 | ||
444 | } | |
445 | ||
1e3914d4 CH |
446 | extern blk_qc_t submit_bio(struct bio *); |
447 | ||
4246a0b6 CH |
448 | extern void bio_endio(struct bio *); |
449 | ||
450 | static inline void bio_io_error(struct bio *bio) | |
451 | { | |
4e4cbee9 | 452 | bio->bi_status = BLK_STS_IOERR; |
4246a0b6 CH |
453 | bio_endio(bio); |
454 | } | |
455 | ||
03a07c92 GR |
456 | static inline void bio_wouldblock_error(struct bio *bio) |
457 | { | |
458 | bio->bi_status = BLK_STS_AGAIN; | |
4246a0b6 CH |
459 | bio_endio(bio); |
460 | } | |
461 | ||
1da177e4 LT |
462 | struct request_queue; |
463 | extern int bio_phys_segments(struct request_queue *, struct bio *); | |
1da177e4 | 464 | |
4e49ea4a | 465 | extern int submit_bio_wait(struct bio *bio); |
054bdf64 KO |
466 | extern void bio_advance(struct bio *, unsigned); |
467 | ||
3a83f467 ML |
468 | extern void bio_init(struct bio *bio, struct bio_vec *table, |
469 | unsigned short max_vecs); | |
9ae3b3f5 | 470 | extern void bio_uninit(struct bio *); |
f44b48c7 | 471 | extern void bio_reset(struct bio *); |
196d38bc | 472 | void bio_chain(struct bio *, struct bio *); |
1da177e4 LT |
473 | |
474 | extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int); | |
6e68af66 MC |
475 | extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *, |
476 | unsigned int, unsigned int); | |
2cefe4db | 477 | int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter); |
152e283f | 478 | struct rq_map_data; |
f1970baf | 479 | extern struct bio *bio_map_user_iov(struct request_queue *, |
e81cef5d | 480 | struct iov_iter *, gfp_t); |
1da177e4 | 481 | extern void bio_unmap_user(struct bio *); |
df46b9a4 | 482 | extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int, |
27496a8c | 483 | gfp_t); |
68154e90 FT |
484 | extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int, |
485 | gfp_t, int); | |
1da177e4 LT |
486 | extern void bio_set_pages_dirty(struct bio *bio); |
487 | extern void bio_check_pages_dirty(struct bio *bio); | |
2d4dc890 | 488 | |
d62e26b3 JA |
489 | void generic_start_io_acct(struct request_queue *q, int rw, |
490 | unsigned long sectors, struct hd_struct *part); | |
491 | void generic_end_io_acct(struct request_queue *q, int rw, | |
492 | struct hd_struct *part, | |
493 | unsigned long start_time); | |
394ffa50 | 494 | |
2d4dc890 IL |
495 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
496 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
497 | #endif | |
498 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
499 | extern void bio_flush_dcache_pages(struct bio *bi); | |
500 | #else | |
501 | static inline void bio_flush_dcache_pages(struct bio *bi) | |
502 | { | |
503 | } | |
504 | #endif | |
505 | ||
45db54d5 KO |
506 | extern void bio_copy_data_iter(struct bio *dst, struct bvec_iter *dst_iter, |
507 | struct bio *src, struct bvec_iter *src_iter); | |
16ac3d63 | 508 | extern void bio_copy_data(struct bio *dst, struct bio *src); |
45db54d5 | 509 | extern void bio_list_copy_data(struct bio *dst, struct bio *src); |
491221f8 | 510 | extern void bio_free_pages(struct bio *bio); |
16ac3d63 | 511 | |
152e283f | 512 | extern struct bio *bio_copy_user_iov(struct request_queue *, |
86d564c8 | 513 | struct rq_map_data *, |
e81cef5d | 514 | struct iov_iter *, |
26e49cfc | 515 | gfp_t); |
1da177e4 | 516 | extern int bio_uncopy_user(struct bio *); |
38a72dac KO |
517 | void zero_fill_bio_iter(struct bio *bio, struct bvec_iter iter); |
518 | ||
519 | static inline void zero_fill_bio(struct bio *bio) | |
520 | { | |
521 | zero_fill_bio_iter(bio, bio->bi_iter); | |
522 | } | |
523 | ||
9f060e22 KO |
524 | extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *); |
525 | extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int); | |
7ba1ba12 | 526 | extern unsigned int bvec_nr_vecs(unsigned short idx); |
9c0fb1e3 | 527 | extern const char *bio_devname(struct bio *bio, char *buffer); |
51d654e1 | 528 | |
74d46992 CH |
529 | #define bio_set_dev(bio, bdev) \ |
530 | do { \ | |
111be883 SL |
531 | if ((bio)->bi_disk != (bdev)->bd_disk) \ |
532 | bio_clear_flag(bio, BIO_THROTTLED);\ | |
74d46992 CH |
533 | (bio)->bi_disk = (bdev)->bd_disk; \ |
534 | (bio)->bi_partno = (bdev)->bd_partno; \ | |
535 | } while (0) | |
536 | ||
537 | #define bio_copy_dev(dst, src) \ | |
538 | do { \ | |
539 | (dst)->bi_disk = (src)->bi_disk; \ | |
540 | (dst)->bi_partno = (src)->bi_partno; \ | |
541 | } while (0) | |
542 | ||
543 | #define bio_dev(bio) \ | |
544 | disk_devt((bio)->bi_disk) | |
545 | ||
852c788f | 546 | #ifdef CONFIG_BLK_CGROUP |
1d933cf0 | 547 | int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css); |
852c788f | 548 | void bio_disassociate_task(struct bio *bio); |
20bd723e | 549 | void bio_clone_blkcg_association(struct bio *dst, struct bio *src); |
852c788f | 550 | #else /* CONFIG_BLK_CGROUP */ |
1d933cf0 TH |
551 | static inline int bio_associate_blkcg(struct bio *bio, |
552 | struct cgroup_subsys_state *blkcg_css) { return 0; } | |
852c788f | 553 | static inline void bio_disassociate_task(struct bio *bio) { } |
20bd723e PV |
554 | static inline void bio_clone_blkcg_association(struct bio *dst, |
555 | struct bio *src) { } | |
852c788f TH |
556 | #endif /* CONFIG_BLK_CGROUP */ |
557 | ||
1da177e4 LT |
558 | #ifdef CONFIG_HIGHMEM |
559 | /* | |
20b636bf AB |
560 | * remember never ever reenable interrupts between a bvec_kmap_irq and |
561 | * bvec_kunmap_irq! | |
1da177e4 | 562 | */ |
4f570f99 | 563 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
1da177e4 LT |
564 | { |
565 | unsigned long addr; | |
566 | ||
567 | /* | |
568 | * might not be a highmem page, but the preempt/irq count | |
569 | * balancing is a lot nicer this way | |
570 | */ | |
571 | local_irq_save(*flags); | |
e8e3c3d6 | 572 | addr = (unsigned long) kmap_atomic(bvec->bv_page); |
1da177e4 LT |
573 | |
574 | BUG_ON(addr & ~PAGE_MASK); | |
575 | ||
576 | return (char *) addr + bvec->bv_offset; | |
577 | } | |
578 | ||
4f570f99 | 579 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) |
1da177e4 LT |
580 | { |
581 | unsigned long ptr = (unsigned long) buffer & PAGE_MASK; | |
582 | ||
e8e3c3d6 | 583 | kunmap_atomic((void *) ptr); |
1da177e4 LT |
584 | local_irq_restore(*flags); |
585 | } | |
586 | ||
587 | #else | |
11a691be GU |
588 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
589 | { | |
590 | return page_address(bvec->bv_page) + bvec->bv_offset; | |
591 | } | |
592 | ||
593 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) | |
594 | { | |
595 | *flags = 0; | |
596 | } | |
1da177e4 LT |
597 | #endif |
598 | ||
8f3d8ba2 | 599 | /* |
e686307f | 600 | * BIO list management for use by remapping drivers (e.g. DM or MD) and loop. |
8f3d8ba2 CH |
601 | * |
602 | * A bio_list anchors a singly-linked list of bios chained through the bi_next | |
603 | * member of the bio. The bio_list also caches the last list member to allow | |
604 | * fast access to the tail. | |
605 | */ | |
606 | struct bio_list { | |
607 | struct bio *head; | |
608 | struct bio *tail; | |
609 | }; | |
610 | ||
611 | static inline int bio_list_empty(const struct bio_list *bl) | |
612 | { | |
613 | return bl->head == NULL; | |
614 | } | |
615 | ||
616 | static inline void bio_list_init(struct bio_list *bl) | |
617 | { | |
618 | bl->head = bl->tail = NULL; | |
619 | } | |
620 | ||
320ae51f JA |
621 | #define BIO_EMPTY_LIST { NULL, NULL } |
622 | ||
8f3d8ba2 CH |
623 | #define bio_list_for_each(bio, bl) \ |
624 | for (bio = (bl)->head; bio; bio = bio->bi_next) | |
625 | ||
626 | static inline unsigned bio_list_size(const struct bio_list *bl) | |
627 | { | |
628 | unsigned sz = 0; | |
629 | struct bio *bio; | |
630 | ||
631 | bio_list_for_each(bio, bl) | |
632 | sz++; | |
633 | ||
634 | return sz; | |
635 | } | |
636 | ||
637 | static inline void bio_list_add(struct bio_list *bl, struct bio *bio) | |
638 | { | |
639 | bio->bi_next = NULL; | |
640 | ||
641 | if (bl->tail) | |
642 | bl->tail->bi_next = bio; | |
643 | else | |
644 | bl->head = bio; | |
645 | ||
646 | bl->tail = bio; | |
647 | } | |
648 | ||
649 | static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio) | |
650 | { | |
651 | bio->bi_next = bl->head; | |
652 | ||
653 | bl->head = bio; | |
654 | ||
655 | if (!bl->tail) | |
656 | bl->tail = bio; | |
657 | } | |
658 | ||
659 | static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2) | |
660 | { | |
661 | if (!bl2->head) | |
662 | return; | |
663 | ||
664 | if (bl->tail) | |
665 | bl->tail->bi_next = bl2->head; | |
666 | else | |
667 | bl->head = bl2->head; | |
668 | ||
669 | bl->tail = bl2->tail; | |
670 | } | |
671 | ||
672 | static inline void bio_list_merge_head(struct bio_list *bl, | |
673 | struct bio_list *bl2) | |
674 | { | |
675 | if (!bl2->head) | |
676 | return; | |
677 | ||
678 | if (bl->head) | |
679 | bl2->tail->bi_next = bl->head; | |
680 | else | |
681 | bl->tail = bl2->tail; | |
682 | ||
683 | bl->head = bl2->head; | |
684 | } | |
685 | ||
13685a16 GU |
686 | static inline struct bio *bio_list_peek(struct bio_list *bl) |
687 | { | |
688 | return bl->head; | |
689 | } | |
690 | ||
8f3d8ba2 CH |
691 | static inline struct bio *bio_list_pop(struct bio_list *bl) |
692 | { | |
693 | struct bio *bio = bl->head; | |
694 | ||
695 | if (bio) { | |
696 | bl->head = bl->head->bi_next; | |
697 | if (!bl->head) | |
698 | bl->tail = NULL; | |
699 | ||
700 | bio->bi_next = NULL; | |
701 | } | |
702 | ||
703 | return bio; | |
704 | } | |
705 | ||
706 | static inline struct bio *bio_list_get(struct bio_list *bl) | |
707 | { | |
708 | struct bio *bio = bl->head; | |
709 | ||
710 | bl->head = bl->tail = NULL; | |
711 | ||
712 | return bio; | |
713 | } | |
714 | ||
0ef5a50c MS |
715 | /* |
716 | * Increment chain count for the bio. Make sure the CHAIN flag update | |
717 | * is visible before the raised count. | |
718 | */ | |
719 | static inline void bio_inc_remaining(struct bio *bio) | |
720 | { | |
721 | bio_set_flag(bio, BIO_CHAIN); | |
722 | smp_mb__before_atomic(); | |
723 | atomic_inc(&bio->__bi_remaining); | |
724 | } | |
725 | ||
57fb233f KO |
726 | /* |
727 | * bio_set is used to allow other portions of the IO system to | |
728 | * allocate their own private memory pools for bio and iovec structures. | |
729 | * These memory pools in turn all allocate from the bio_slab | |
730 | * and the bvec_slabs[]. | |
731 | */ | |
732 | #define BIO_POOL_SIZE 2 | |
57fb233f KO |
733 | |
734 | struct bio_set { | |
735 | struct kmem_cache *bio_slab; | |
736 | unsigned int front_pad; | |
737 | ||
8aa6ba2f KO |
738 | mempool_t bio_pool; |
739 | mempool_t bvec_pool; | |
57fb233f | 740 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
8aa6ba2f KO |
741 | mempool_t bio_integrity_pool; |
742 | mempool_t bvec_integrity_pool; | |
57fb233f | 743 | #endif |
df2cb6da KO |
744 | |
745 | /* | |
746 | * Deadlock avoidance for stacking block drivers: see comments in | |
747 | * bio_alloc_bioset() for details | |
748 | */ | |
749 | spinlock_t rescue_lock; | |
750 | struct bio_list rescue_list; | |
751 | struct work_struct rescue_work; | |
752 | struct workqueue_struct *rescue_workqueue; | |
57fb233f KO |
753 | }; |
754 | ||
755 | struct biovec_slab { | |
756 | int nr_vecs; | |
757 | char *name; | |
758 | struct kmem_cache *slab; | |
759 | }; | |
760 | ||
338aa96d KO |
761 | static inline bool bioset_initialized(struct bio_set *bs) |
762 | { | |
763 | return bs->bio_slab != NULL; | |
764 | } | |
765 | ||
57fb233f KO |
766 | /* |
767 | * a small number of entries is fine, not going to be performance critical. | |
768 | * basically we just need to survive | |
769 | */ | |
770 | #define BIO_SPLIT_ENTRIES 2 | |
771 | ||
7ba1ba12 MP |
772 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
773 | ||
d57a5f7c KO |
774 | #define bip_for_each_vec(bvl, bip, iter) \ |
775 | for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter) | |
7ba1ba12 | 776 | |
13f05c8d MP |
777 | #define bio_for_each_integrity_vec(_bvl, _bio, _iter) \ |
778 | for_each_bio(_bio) \ | |
779 | bip_for_each_vec(_bvl, _bio->bi_integrity, _iter) | |
780 | ||
7ba1ba12 | 781 | extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int); |
7ba1ba12 | 782 | extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int); |
e23947bd | 783 | extern bool bio_integrity_prep(struct bio *); |
7ba1ba12 | 784 | extern void bio_integrity_advance(struct bio *, unsigned int); |
fbd08e76 | 785 | extern void bio_integrity_trim(struct bio *); |
1e2a410f | 786 | extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t); |
7878cba9 MP |
787 | extern int bioset_integrity_create(struct bio_set *, int); |
788 | extern void bioset_integrity_free(struct bio_set *); | |
789 | extern void bio_integrity_init(void); | |
7ba1ba12 MP |
790 | |
791 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
792 | ||
c611529e | 793 | static inline void *bio_integrity(struct bio *bio) |
6898e3bd | 794 | { |
c611529e | 795 | return NULL; |
6898e3bd MP |
796 | } |
797 | ||
6898e3bd MP |
798 | static inline int bioset_integrity_create(struct bio_set *bs, int pool_size) |
799 | { | |
800 | return 0; | |
801 | } | |
802 | ||
803 | static inline void bioset_integrity_free (struct bio_set *bs) | |
804 | { | |
805 | return; | |
806 | } | |
807 | ||
e23947bd | 808 | static inline bool bio_integrity_prep(struct bio *bio) |
6898e3bd | 809 | { |
e23947bd | 810 | return true; |
6898e3bd MP |
811 | } |
812 | ||
0c614e2d | 813 | static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
1e2a410f | 814 | gfp_t gfp_mask) |
0c614e2d SR |
815 | { |
816 | return 0; | |
817 | } | |
6898e3bd | 818 | |
6898e3bd MP |
819 | static inline void bio_integrity_advance(struct bio *bio, |
820 | unsigned int bytes_done) | |
821 | { | |
822 | return; | |
823 | } | |
824 | ||
fbd08e76 | 825 | static inline void bio_integrity_trim(struct bio *bio) |
6898e3bd MP |
826 | { |
827 | return; | |
828 | } | |
829 | ||
830 | static inline void bio_integrity_init(void) | |
831 | { | |
832 | return; | |
833 | } | |
7ba1ba12 | 834 | |
c611529e MP |
835 | static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag) |
836 | { | |
837 | return false; | |
838 | } | |
839 | ||
06c1e390 KB |
840 | static inline void *bio_integrity_alloc(struct bio * bio, gfp_t gfp, |
841 | unsigned int nr) | |
842 | { | |
843 | return ERR_PTR(-EINVAL); | |
844 | } | |
845 | ||
846 | static inline int bio_integrity_add_page(struct bio *bio, struct page *page, | |
847 | unsigned int len, unsigned int offset) | |
848 | { | |
849 | return 0; | |
850 | } | |
851 | ||
7ba1ba12 MP |
852 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
853 | ||
02a5e0ac | 854 | #endif /* CONFIG_BLOCK */ |
1da177e4 | 855 | #endif /* __LINUX_BIO_H */ |