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Commit | Line | Data |
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8c16567d | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 | 2 | /* |
1da177e4 | 3 | * Copyright (C) 2001 Jens Axboe <axboe@suse.de> |
1da177e4 LT |
4 | */ |
5 | #ifndef __LINUX_BIO_H | |
6 | #define __LINUX_BIO_H | |
7 | ||
8 | #include <linux/highmem.h> | |
9 | #include <linux/mempool.h> | |
22e2c507 | 10 | #include <linux/ioprio.h> |
1da177e4 | 11 | |
02a5e0ac | 12 | #ifdef CONFIG_BLOCK |
7cc01581 TH |
13 | /* struct bio, bio_vec and BIO_* flags are defined in blk_types.h */ |
14 | #include <linux/blk_types.h> | |
15 | ||
1da177e4 LT |
16 | #define BIO_DEBUG |
17 | ||
18 | #ifdef BIO_DEBUG | |
19 | #define BIO_BUG_ON BUG_ON | |
20 | #else | |
21 | #define BIO_BUG_ON | |
22 | #endif | |
23 | ||
d84a8477 | 24 | #define BIO_MAX_PAGES 256 |
1da177e4 | 25 | |
43b62ce3 MC |
26 | #define bio_prio(bio) (bio)->bi_ioprio |
27 | #define bio_set_prio(bio, prio) ((bio)->bi_ioprio = prio) | |
22e2c507 | 28 | |
4550dd6c KO |
29 | #define bio_iter_iovec(bio, iter) \ |
30 | bvec_iter_bvec((bio)->bi_io_vec, (iter)) | |
31 | ||
32 | #define bio_iter_page(bio, iter) \ | |
33 | bvec_iter_page((bio)->bi_io_vec, (iter)) | |
34 | #define bio_iter_len(bio, iter) \ | |
35 | bvec_iter_len((bio)->bi_io_vec, (iter)) | |
36 | #define bio_iter_offset(bio, iter) \ | |
37 | bvec_iter_offset((bio)->bi_io_vec, (iter)) | |
38 | ||
39 | #define bio_page(bio) bio_iter_page((bio), (bio)->bi_iter) | |
40 | #define bio_offset(bio) bio_iter_offset((bio), (bio)->bi_iter) | |
41 | #define bio_iovec(bio) bio_iter_iovec((bio), (bio)->bi_iter) | |
7988613b | 42 | |
458b76ed KO |
43 | #define bio_multiple_segments(bio) \ |
44 | ((bio)->bi_iter.bi_size != bio_iovec(bio).bv_len) | |
38a72dac KO |
45 | |
46 | #define bvec_iter_sectors(iter) ((iter).bi_size >> 9) | |
47 | #define bvec_iter_end_sector(iter) ((iter).bi_sector + bvec_iter_sectors((iter))) | |
48 | ||
49 | #define bio_sectors(bio) bvec_iter_sectors((bio)->bi_iter) | |
50 | #define bio_end_sector(bio) bvec_iter_end_sector((bio)->bi_iter) | |
bf2de6f5 | 51 | |
d3849953 CH |
52 | /* |
53 | * Return the data direction, READ or WRITE. | |
54 | */ | |
55 | #define bio_data_dir(bio) \ | |
56 | (op_is_write(bio_op(bio)) ? WRITE : READ) | |
57 | ||
458b76ed KO |
58 | /* |
59 | * Check whether this bio carries any data or not. A NULL bio is allowed. | |
60 | */ | |
61 | static inline bool bio_has_data(struct bio *bio) | |
62 | { | |
63 | if (bio && | |
64 | bio->bi_iter.bi_size && | |
7afafc8a | 65 | bio_op(bio) != REQ_OP_DISCARD && |
a6f0788e CK |
66 | bio_op(bio) != REQ_OP_SECURE_ERASE && |
67 | bio_op(bio) != REQ_OP_WRITE_ZEROES) | |
458b76ed KO |
68 | return true; |
69 | ||
70 | return false; | |
71 | } | |
72 | ||
95fe6c1a MC |
73 | static inline bool bio_no_advance_iter(struct bio *bio) |
74 | { | |
7afafc8a AH |
75 | return bio_op(bio) == REQ_OP_DISCARD || |
76 | bio_op(bio) == REQ_OP_SECURE_ERASE || | |
a6f0788e CK |
77 | bio_op(bio) == REQ_OP_WRITE_SAME || |
78 | bio_op(bio) == REQ_OP_WRITE_ZEROES; | |
95fe6c1a MC |
79 | } |
80 | ||
458b76ed KO |
81 | static inline bool bio_mergeable(struct bio *bio) |
82 | { | |
1eff9d32 | 83 | if (bio->bi_opf & REQ_NOMERGE_FLAGS) |
458b76ed KO |
84 | return false; |
85 | ||
86 | return true; | |
87 | } | |
88 | ||
2e46e8b2 | 89 | static inline unsigned int bio_cur_bytes(struct bio *bio) |
bf2de6f5 | 90 | { |
458b76ed | 91 | if (bio_has_data(bio)) |
a4ad39b1 | 92 | return bio_iovec(bio).bv_len; |
fb2dce86 | 93 | else /* dataless requests such as discard */ |
4f024f37 | 94 | return bio->bi_iter.bi_size; |
bf2de6f5 JA |
95 | } |
96 | ||
97 | static inline void *bio_data(struct bio *bio) | |
98 | { | |
458b76ed | 99 | if (bio_has_data(bio)) |
bf2de6f5 JA |
100 | return page_address(bio_page(bio)) + bio_offset(bio); |
101 | ||
102 | return NULL; | |
103 | } | |
1da177e4 | 104 | |
0aa69fd3 CH |
105 | static inline bool bio_full(struct bio *bio) |
106 | { | |
107 | return bio->bi_vcnt >= bio->bi_max_vecs; | |
108 | } | |
109 | ||
1200e07f ML |
110 | static inline bool bio_next_segment(const struct bio *bio, |
111 | struct bvec_iter_all *iter) | |
112 | { | |
113 | if (iter->idx >= bio->bi_vcnt) | |
114 | return false; | |
115 | ||
116 | bvec_advance(&bio->bi_io_vec[iter->idx], iter); | |
117 | return true; | |
118 | } | |
6dc4f100 | 119 | |
d74c6d51 KO |
120 | /* |
121 | * drivers should _never_ use the all version - the bio may have been split | |
122 | * before it got to the driver and the driver won't own all of it | |
123 | */ | |
2b070cfe CH |
124 | #define bio_for_each_segment_all(bvl, bio, iter) \ |
125 | for (bvl = bvec_init_iter_all(&iter); bio_next_segment((bio), &iter); ) | |
d74c6d51 | 126 | |
4550dd6c KO |
127 | static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter, |
128 | unsigned bytes) | |
129 | { | |
130 | iter->bi_sector += bytes >> 9; | |
131 | ||
7759eb23 | 132 | if (bio_no_advance_iter(bio)) |
4550dd6c | 133 | iter->bi_size -= bytes; |
7759eb23 | 134 | else |
4550dd6c | 135 | bvec_iter_advance(bio->bi_io_vec, iter, bytes); |
b1fb2c52 | 136 | /* TODO: It is reasonable to complete bio with error here. */ |
f9df1cd9 DM |
137 | } |
138 | ||
7988613b KO |
139 | #define __bio_for_each_segment(bvl, bio, iter, start) \ |
140 | for (iter = (start); \ | |
4550dd6c KO |
141 | (iter).bi_size && \ |
142 | ((bvl = bio_iter_iovec((bio), (iter))), 1); \ | |
143 | bio_advance_iter((bio), &(iter), (bvl).bv_len)) | |
7988613b KO |
144 | |
145 | #define bio_for_each_segment(bvl, bio, iter) \ | |
146 | __bio_for_each_segment(bvl, bio, iter, (bio)->bi_iter) | |
147 | ||
d18d9174 ML |
148 | #define __bio_for_each_bvec(bvl, bio, iter, start) \ |
149 | for (iter = (start); \ | |
150 | (iter).bi_size && \ | |
151 | ((bvl = mp_bvec_iter_bvec((bio)->bi_io_vec, (iter))), 1); \ | |
152 | bio_advance_iter((bio), &(iter), (bvl).bv_len)) | |
153 | ||
154 | /* iterate over multi-page bvec */ | |
155 | #define bio_for_each_bvec(bvl, bio, iter) \ | |
156 | __bio_for_each_bvec(bvl, bio, iter, (bio)->bi_iter) | |
157 | ||
4550dd6c | 158 | #define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len) |
1da177e4 | 159 | |
f4595875 | 160 | static inline unsigned bio_segments(struct bio *bio) |
458b76ed KO |
161 | { |
162 | unsigned segs = 0; | |
163 | struct bio_vec bv; | |
164 | struct bvec_iter iter; | |
165 | ||
8423ae3d | 166 | /* |
a6f0788e CK |
167 | * We special case discard/write same/write zeroes, because they |
168 | * interpret bi_size differently: | |
8423ae3d KO |
169 | */ |
170 | ||
a6f0788e CK |
171 | switch (bio_op(bio)) { |
172 | case REQ_OP_DISCARD: | |
173 | case REQ_OP_SECURE_ERASE: | |
a6f0788e | 174 | case REQ_OP_WRITE_ZEROES: |
f9d03f96 CH |
175 | return 0; |
176 | case REQ_OP_WRITE_SAME: | |
8423ae3d | 177 | return 1; |
a6f0788e CK |
178 | default: |
179 | break; | |
180 | } | |
8423ae3d | 181 | |
f4595875 | 182 | bio_for_each_segment(bv, bio, iter) |
458b76ed KO |
183 | segs++; |
184 | ||
185 | return segs; | |
186 | } | |
187 | ||
1da177e4 LT |
188 | /* |
189 | * get a reference to a bio, so it won't disappear. the intended use is | |
190 | * something like: | |
191 | * | |
192 | * bio_get(bio); | |
193 | * submit_bio(rw, bio); | |
194 | * if (bio->bi_flags ...) | |
195 | * do_something | |
196 | * bio_put(bio); | |
197 | * | |
198 | * without the bio_get(), it could potentially complete I/O before submit_bio | |
199 | * returns. and then bio would be freed memory when if (bio->bi_flags ...) | |
200 | * runs | |
201 | */ | |
dac56212 JA |
202 | static inline void bio_get(struct bio *bio) |
203 | { | |
204 | bio->bi_flags |= (1 << BIO_REFFED); | |
205 | smp_mb__before_atomic(); | |
206 | atomic_inc(&bio->__bi_cnt); | |
207 | } | |
208 | ||
209 | static inline void bio_cnt_set(struct bio *bio, unsigned int count) | |
210 | { | |
211 | if (count != 1) { | |
212 | bio->bi_flags |= (1 << BIO_REFFED); | |
f381c6a4 | 213 | smp_mb(); |
dac56212 JA |
214 | } |
215 | atomic_set(&bio->__bi_cnt, count); | |
216 | } | |
1da177e4 | 217 | |
b7c44ed9 JA |
218 | static inline bool bio_flagged(struct bio *bio, unsigned int bit) |
219 | { | |
2c68f6dc | 220 | return (bio->bi_flags & (1U << bit)) != 0; |
b7c44ed9 JA |
221 | } |
222 | ||
223 | static inline void bio_set_flag(struct bio *bio, unsigned int bit) | |
224 | { | |
2c68f6dc | 225 | bio->bi_flags |= (1U << bit); |
b7c44ed9 JA |
226 | } |
227 | ||
228 | static inline void bio_clear_flag(struct bio *bio, unsigned int bit) | |
229 | { | |
2c68f6dc | 230 | bio->bi_flags &= ~(1U << bit); |
b7c44ed9 JA |
231 | } |
232 | ||
7bcd79ac ML |
233 | static inline void bio_get_first_bvec(struct bio *bio, struct bio_vec *bv) |
234 | { | |
235 | *bv = bio_iovec(bio); | |
236 | } | |
237 | ||
238 | static inline void bio_get_last_bvec(struct bio *bio, struct bio_vec *bv) | |
239 | { | |
240 | struct bvec_iter iter = bio->bi_iter; | |
241 | int idx; | |
242 | ||
7bcd79ac ML |
243 | if (unlikely(!bio_multiple_segments(bio))) { |
244 | *bv = bio_iovec(bio); | |
245 | return; | |
246 | } | |
247 | ||
248 | bio_advance_iter(bio, &iter, iter.bi_size); | |
249 | ||
250 | if (!iter.bi_bvec_done) | |
251 | idx = iter.bi_idx - 1; | |
252 | else /* in the middle of bvec */ | |
253 | idx = iter.bi_idx; | |
254 | ||
255 | *bv = bio->bi_io_vec[idx]; | |
256 | ||
257 | /* | |
258 | * iter.bi_bvec_done records actual length of the last bvec | |
259 | * if this bio ends in the middle of one io vector | |
260 | */ | |
261 | if (iter.bi_bvec_done) | |
262 | bv->bv_len = iter.bi_bvec_done; | |
263 | } | |
264 | ||
86292abc ML |
265 | static inline struct bio_vec *bio_first_bvec_all(struct bio *bio) |
266 | { | |
267 | WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED)); | |
268 | return bio->bi_io_vec; | |
269 | } | |
270 | ||
271 | static inline struct page *bio_first_page_all(struct bio *bio) | |
272 | { | |
273 | return bio_first_bvec_all(bio)->bv_page; | |
274 | } | |
275 | ||
276 | static inline struct bio_vec *bio_last_bvec_all(struct bio *bio) | |
277 | { | |
278 | WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED)); | |
279 | return &bio->bi_io_vec[bio->bi_vcnt - 1]; | |
280 | } | |
281 | ||
c611529e MP |
282 | enum bip_flags { |
283 | BIP_BLOCK_INTEGRITY = 1 << 0, /* block layer owns integrity data */ | |
284 | BIP_MAPPED_INTEGRITY = 1 << 1, /* ref tag has been remapped */ | |
285 | BIP_CTRL_NOCHECK = 1 << 2, /* disable HBA integrity checking */ | |
286 | BIP_DISK_NOCHECK = 1 << 3, /* disable disk integrity checking */ | |
287 | BIP_IP_CHECKSUM = 1 << 4, /* IP checksum */ | |
288 | }; | |
289 | ||
7ba1ba12 MP |
290 | /* |
291 | * bio integrity payload | |
292 | */ | |
293 | struct bio_integrity_payload { | |
294 | struct bio *bip_bio; /* parent bio */ | |
7ba1ba12 | 295 | |
d57a5f7c | 296 | struct bvec_iter bip_iter; |
7ba1ba12 | 297 | |
7878cba9 | 298 | unsigned short bip_slab; /* slab the bip came from */ |
7ba1ba12 | 299 | unsigned short bip_vcnt; /* # of integrity bio_vecs */ |
cbcd1054 | 300 | unsigned short bip_max_vcnt; /* integrity bio_vec slots */ |
b1f01388 | 301 | unsigned short bip_flags; /* control flags */ |
7ba1ba12 | 302 | |
7759eb23 ML |
303 | struct bvec_iter bio_iter; /* for rewinding parent bio */ |
304 | ||
7ba1ba12 | 305 | struct work_struct bip_work; /* I/O completion */ |
6fda981c KO |
306 | |
307 | struct bio_vec *bip_vec; | |
308 | struct bio_vec bip_inline_vecs[0];/* embedded bvec array */ | |
7ba1ba12 | 309 | }; |
18593088 | 310 | |
06c1e390 KB |
311 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
312 | ||
313 | static inline struct bio_integrity_payload *bio_integrity(struct bio *bio) | |
314 | { | |
1eff9d32 | 315 | if (bio->bi_opf & REQ_INTEGRITY) |
06c1e390 KB |
316 | return bio->bi_integrity; |
317 | ||
318 | return NULL; | |
319 | } | |
320 | ||
c611529e MP |
321 | static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag) |
322 | { | |
323 | struct bio_integrity_payload *bip = bio_integrity(bio); | |
324 | ||
325 | if (bip) | |
326 | return bip->bip_flags & flag; | |
327 | ||
328 | return false; | |
329 | } | |
b1f01388 | 330 | |
18593088 MP |
331 | static inline sector_t bip_get_seed(struct bio_integrity_payload *bip) |
332 | { | |
333 | return bip->bip_iter.bi_sector; | |
334 | } | |
335 | ||
336 | static inline void bip_set_seed(struct bio_integrity_payload *bip, | |
337 | sector_t seed) | |
338 | { | |
339 | bip->bip_iter.bi_sector = seed; | |
340 | } | |
341 | ||
7ba1ba12 | 342 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
1da177e4 | 343 | |
6678d83f | 344 | extern void bio_trim(struct bio *bio, int offset, int size); |
20d0189b KO |
345 | extern struct bio *bio_split(struct bio *bio, int sectors, |
346 | gfp_t gfp, struct bio_set *bs); | |
347 | ||
348 | /** | |
349 | * bio_next_split - get next @sectors from a bio, splitting if necessary | |
350 | * @bio: bio to split | |
351 | * @sectors: number of sectors to split from the front of @bio | |
352 | * @gfp: gfp mask | |
353 | * @bs: bio set to allocate from | |
354 | * | |
355 | * Returns a bio representing the next @sectors of @bio - if the bio is smaller | |
356 | * than @sectors, returns the original bio unchanged. | |
357 | */ | |
358 | static inline struct bio *bio_next_split(struct bio *bio, int sectors, | |
359 | gfp_t gfp, struct bio_set *bs) | |
360 | { | |
361 | if (sectors >= bio_sectors(bio)) | |
362 | return bio; | |
363 | ||
364 | return bio_split(bio, sectors, gfp, bs); | |
365 | } | |
366 | ||
011067b0 N |
367 | enum { |
368 | BIOSET_NEED_BVECS = BIT(0), | |
47e0fb46 | 369 | BIOSET_NEED_RESCUER = BIT(1), |
011067b0 | 370 | }; |
dad08527 KO |
371 | extern int bioset_init(struct bio_set *, unsigned int, unsigned int, int flags); |
372 | extern void bioset_exit(struct bio_set *); | |
8aa6ba2f | 373 | extern int biovec_init_pool(mempool_t *pool, int pool_entries); |
28e89fd9 | 374 | extern int bioset_init_from_src(struct bio_set *bs, struct bio_set *src); |
1da177e4 | 375 | |
7a88fa19 | 376 | extern struct bio *bio_alloc_bioset(gfp_t, unsigned int, struct bio_set *); |
1da177e4 LT |
377 | extern void bio_put(struct bio *); |
378 | ||
59d276fe KO |
379 | extern void __bio_clone_fast(struct bio *, struct bio *); |
380 | extern struct bio *bio_clone_fast(struct bio *, gfp_t, struct bio_set *); | |
bf800ef1 | 381 | |
f4f8154a | 382 | extern struct bio_set fs_bio_set; |
3f86a82a KO |
383 | |
384 | static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) | |
385 | { | |
f4f8154a | 386 | return bio_alloc_bioset(gfp_mask, nr_iovecs, &fs_bio_set); |
3f86a82a KO |
387 | } |
388 | ||
389 | static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs) | |
390 | { | |
391 | return bio_alloc_bioset(gfp_mask, nr_iovecs, NULL); | |
392 | } | |
393 | ||
1e3914d4 CH |
394 | extern blk_qc_t submit_bio(struct bio *); |
395 | ||
4246a0b6 CH |
396 | extern void bio_endio(struct bio *); |
397 | ||
398 | static inline void bio_io_error(struct bio *bio) | |
399 | { | |
4e4cbee9 | 400 | bio->bi_status = BLK_STS_IOERR; |
4246a0b6 CH |
401 | bio_endio(bio); |
402 | } | |
403 | ||
03a07c92 GR |
404 | static inline void bio_wouldblock_error(struct bio *bio) |
405 | { | |
406 | bio->bi_status = BLK_STS_AGAIN; | |
4246a0b6 CH |
407 | bio_endio(bio); |
408 | } | |
409 | ||
1da177e4 LT |
410 | struct request_queue; |
411 | extern int bio_phys_segments(struct request_queue *, struct bio *); | |
1da177e4 | 412 | |
4e49ea4a | 413 | extern int submit_bio_wait(struct bio *bio); |
054bdf64 KO |
414 | extern void bio_advance(struct bio *, unsigned); |
415 | ||
3a83f467 ML |
416 | extern void bio_init(struct bio *bio, struct bio_vec *table, |
417 | unsigned short max_vecs); | |
9ae3b3f5 | 418 | extern void bio_uninit(struct bio *); |
f44b48c7 | 419 | extern void bio_reset(struct bio *); |
196d38bc | 420 | void bio_chain(struct bio *, struct bio *); |
1da177e4 LT |
421 | |
422 | extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int); | |
6e68af66 MC |
423 | extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *, |
424 | unsigned int, unsigned int); | |
0aa69fd3 | 425 | bool __bio_try_merge_page(struct bio *bio, struct page *page, |
ff896738 | 426 | unsigned int len, unsigned int off, bool *same_page); |
0aa69fd3 CH |
427 | void __bio_add_page(struct bio *bio, struct page *page, |
428 | unsigned int len, unsigned int off); | |
2cefe4db | 429 | int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter); |
152e283f | 430 | struct rq_map_data; |
f1970baf | 431 | extern struct bio *bio_map_user_iov(struct request_queue *, |
e81cef5d | 432 | struct iov_iter *, gfp_t); |
1da177e4 | 433 | extern void bio_unmap_user(struct bio *); |
df46b9a4 | 434 | extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int, |
27496a8c | 435 | gfp_t); |
68154e90 FT |
436 | extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int, |
437 | gfp_t, int); | |
1da177e4 LT |
438 | extern void bio_set_pages_dirty(struct bio *bio); |
439 | extern void bio_check_pages_dirty(struct bio *bio); | |
2d4dc890 | 440 | |
ddcf35d3 | 441 | void generic_start_io_acct(struct request_queue *q, int op, |
d62e26b3 | 442 | unsigned long sectors, struct hd_struct *part); |
ddcf35d3 | 443 | void generic_end_io_acct(struct request_queue *q, int op, |
d62e26b3 JA |
444 | struct hd_struct *part, |
445 | unsigned long start_time); | |
394ffa50 | 446 | |
2d4dc890 IL |
447 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
448 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
449 | #endif | |
450 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
451 | extern void bio_flush_dcache_pages(struct bio *bi); | |
452 | #else | |
453 | static inline void bio_flush_dcache_pages(struct bio *bi) | |
454 | { | |
455 | } | |
456 | #endif | |
457 | ||
45db54d5 KO |
458 | extern void bio_copy_data_iter(struct bio *dst, struct bvec_iter *dst_iter, |
459 | struct bio *src, struct bvec_iter *src_iter); | |
16ac3d63 | 460 | extern void bio_copy_data(struct bio *dst, struct bio *src); |
45db54d5 | 461 | extern void bio_list_copy_data(struct bio *dst, struct bio *src); |
491221f8 | 462 | extern void bio_free_pages(struct bio *bio); |
16ac3d63 | 463 | |
152e283f | 464 | extern struct bio *bio_copy_user_iov(struct request_queue *, |
86d564c8 | 465 | struct rq_map_data *, |
e81cef5d | 466 | struct iov_iter *, |
26e49cfc | 467 | gfp_t); |
1da177e4 | 468 | extern int bio_uncopy_user(struct bio *); |
38a72dac KO |
469 | void zero_fill_bio_iter(struct bio *bio, struct bvec_iter iter); |
470 | ||
471 | static inline void zero_fill_bio(struct bio *bio) | |
472 | { | |
473 | zero_fill_bio_iter(bio, bio->bi_iter); | |
474 | } | |
475 | ||
9f060e22 KO |
476 | extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *); |
477 | extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int); | |
7ba1ba12 | 478 | extern unsigned int bvec_nr_vecs(unsigned short idx); |
9c0fb1e3 | 479 | extern const char *bio_devname(struct bio *bio, char *buffer); |
51d654e1 | 480 | |
74d46992 CH |
481 | #define bio_set_dev(bio, bdev) \ |
482 | do { \ | |
111be883 SL |
483 | if ((bio)->bi_disk != (bdev)->bd_disk) \ |
484 | bio_clear_flag(bio, BIO_THROTTLED);\ | |
74d46992 CH |
485 | (bio)->bi_disk = (bdev)->bd_disk; \ |
486 | (bio)->bi_partno = (bdev)->bd_partno; \ | |
5cdf2e3f | 487 | bio_associate_blkg(bio); \ |
74d46992 CH |
488 | } while (0) |
489 | ||
490 | #define bio_copy_dev(dst, src) \ | |
491 | do { \ | |
492 | (dst)->bi_disk = (src)->bi_disk; \ | |
493 | (dst)->bi_partno = (src)->bi_partno; \ | |
db6638d7 | 494 | bio_clone_blkg_association(dst, src); \ |
74d46992 CH |
495 | } while (0) |
496 | ||
497 | #define bio_dev(bio) \ | |
498 | disk_devt((bio)->bi_disk) | |
499 | ||
0d3bd88d | 500 | #if defined(CONFIG_MEMCG) && defined(CONFIG_BLK_CGROUP) |
6a7f6d86 | 501 | void bio_associate_blkg_from_page(struct bio *bio, struct page *page); |
0d3bd88d | 502 | #else |
6a7f6d86 DZ |
503 | static inline void bio_associate_blkg_from_page(struct bio *bio, |
504 | struct page *page) { } | |
0d3bd88d TH |
505 | #endif |
506 | ||
852c788f | 507 | #ifdef CONFIG_BLK_CGROUP |
2268c0fe DZ |
508 | void bio_disassociate_blkg(struct bio *bio); |
509 | void bio_associate_blkg(struct bio *bio); | |
fd42df30 DZ |
510 | void bio_associate_blkg_from_css(struct bio *bio, |
511 | struct cgroup_subsys_state *css); | |
db6638d7 | 512 | void bio_clone_blkg_association(struct bio *dst, struct bio *src); |
852c788f | 513 | #else /* CONFIG_BLK_CGROUP */ |
2268c0fe DZ |
514 | static inline void bio_disassociate_blkg(struct bio *bio) { } |
515 | static inline void bio_associate_blkg(struct bio *bio) { } | |
fd42df30 DZ |
516 | static inline void bio_associate_blkg_from_css(struct bio *bio, |
517 | struct cgroup_subsys_state *css) | |
518 | { } | |
db6638d7 DZ |
519 | static inline void bio_clone_blkg_association(struct bio *dst, |
520 | struct bio *src) { } | |
852c788f TH |
521 | #endif /* CONFIG_BLK_CGROUP */ |
522 | ||
1da177e4 LT |
523 | #ifdef CONFIG_HIGHMEM |
524 | /* | |
20b636bf AB |
525 | * remember never ever reenable interrupts between a bvec_kmap_irq and |
526 | * bvec_kunmap_irq! | |
1da177e4 | 527 | */ |
4f570f99 | 528 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
1da177e4 LT |
529 | { |
530 | unsigned long addr; | |
531 | ||
532 | /* | |
533 | * might not be a highmem page, but the preempt/irq count | |
534 | * balancing is a lot nicer this way | |
535 | */ | |
536 | local_irq_save(*flags); | |
e8e3c3d6 | 537 | addr = (unsigned long) kmap_atomic(bvec->bv_page); |
1da177e4 LT |
538 | |
539 | BUG_ON(addr & ~PAGE_MASK); | |
540 | ||
541 | return (char *) addr + bvec->bv_offset; | |
542 | } | |
543 | ||
4f570f99 | 544 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) |
1da177e4 LT |
545 | { |
546 | unsigned long ptr = (unsigned long) buffer & PAGE_MASK; | |
547 | ||
e8e3c3d6 | 548 | kunmap_atomic((void *) ptr); |
1da177e4 LT |
549 | local_irq_restore(*flags); |
550 | } | |
551 | ||
552 | #else | |
11a691be GU |
553 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
554 | { | |
555 | return page_address(bvec->bv_page) + bvec->bv_offset; | |
556 | } | |
557 | ||
558 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) | |
559 | { | |
560 | *flags = 0; | |
561 | } | |
1da177e4 LT |
562 | #endif |
563 | ||
8f3d8ba2 | 564 | /* |
e686307f | 565 | * BIO list management for use by remapping drivers (e.g. DM or MD) and loop. |
8f3d8ba2 CH |
566 | * |
567 | * A bio_list anchors a singly-linked list of bios chained through the bi_next | |
568 | * member of the bio. The bio_list also caches the last list member to allow | |
569 | * fast access to the tail. | |
570 | */ | |
571 | struct bio_list { | |
572 | struct bio *head; | |
573 | struct bio *tail; | |
574 | }; | |
575 | ||
576 | static inline int bio_list_empty(const struct bio_list *bl) | |
577 | { | |
578 | return bl->head == NULL; | |
579 | } | |
580 | ||
581 | static inline void bio_list_init(struct bio_list *bl) | |
582 | { | |
583 | bl->head = bl->tail = NULL; | |
584 | } | |
585 | ||
320ae51f JA |
586 | #define BIO_EMPTY_LIST { NULL, NULL } |
587 | ||
8f3d8ba2 CH |
588 | #define bio_list_for_each(bio, bl) \ |
589 | for (bio = (bl)->head; bio; bio = bio->bi_next) | |
590 | ||
591 | static inline unsigned bio_list_size(const struct bio_list *bl) | |
592 | { | |
593 | unsigned sz = 0; | |
594 | struct bio *bio; | |
595 | ||
596 | bio_list_for_each(bio, bl) | |
597 | sz++; | |
598 | ||
599 | return sz; | |
600 | } | |
601 | ||
602 | static inline void bio_list_add(struct bio_list *bl, struct bio *bio) | |
603 | { | |
604 | bio->bi_next = NULL; | |
605 | ||
606 | if (bl->tail) | |
607 | bl->tail->bi_next = bio; | |
608 | else | |
609 | bl->head = bio; | |
610 | ||
611 | bl->tail = bio; | |
612 | } | |
613 | ||
614 | static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio) | |
615 | { | |
616 | bio->bi_next = bl->head; | |
617 | ||
618 | bl->head = bio; | |
619 | ||
620 | if (!bl->tail) | |
621 | bl->tail = bio; | |
622 | } | |
623 | ||
624 | static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2) | |
625 | { | |
626 | if (!bl2->head) | |
627 | return; | |
628 | ||
629 | if (bl->tail) | |
630 | bl->tail->bi_next = bl2->head; | |
631 | else | |
632 | bl->head = bl2->head; | |
633 | ||
634 | bl->tail = bl2->tail; | |
635 | } | |
636 | ||
637 | static inline void bio_list_merge_head(struct bio_list *bl, | |
638 | struct bio_list *bl2) | |
639 | { | |
640 | if (!bl2->head) | |
641 | return; | |
642 | ||
643 | if (bl->head) | |
644 | bl2->tail->bi_next = bl->head; | |
645 | else | |
646 | bl->tail = bl2->tail; | |
647 | ||
648 | bl->head = bl2->head; | |
649 | } | |
650 | ||
13685a16 GU |
651 | static inline struct bio *bio_list_peek(struct bio_list *bl) |
652 | { | |
653 | return bl->head; | |
654 | } | |
655 | ||
8f3d8ba2 CH |
656 | static inline struct bio *bio_list_pop(struct bio_list *bl) |
657 | { | |
658 | struct bio *bio = bl->head; | |
659 | ||
660 | if (bio) { | |
661 | bl->head = bl->head->bi_next; | |
662 | if (!bl->head) | |
663 | bl->tail = NULL; | |
664 | ||
665 | bio->bi_next = NULL; | |
666 | } | |
667 | ||
668 | return bio; | |
669 | } | |
670 | ||
671 | static inline struct bio *bio_list_get(struct bio_list *bl) | |
672 | { | |
673 | struct bio *bio = bl->head; | |
674 | ||
675 | bl->head = bl->tail = NULL; | |
676 | ||
677 | return bio; | |
678 | } | |
679 | ||
0ef5a50c MS |
680 | /* |
681 | * Increment chain count for the bio. Make sure the CHAIN flag update | |
682 | * is visible before the raised count. | |
683 | */ | |
684 | static inline void bio_inc_remaining(struct bio *bio) | |
685 | { | |
686 | bio_set_flag(bio, BIO_CHAIN); | |
687 | smp_mb__before_atomic(); | |
688 | atomic_inc(&bio->__bi_remaining); | |
689 | } | |
690 | ||
57fb233f KO |
691 | /* |
692 | * bio_set is used to allow other portions of the IO system to | |
693 | * allocate their own private memory pools for bio and iovec structures. | |
694 | * These memory pools in turn all allocate from the bio_slab | |
695 | * and the bvec_slabs[]. | |
696 | */ | |
697 | #define BIO_POOL_SIZE 2 | |
57fb233f KO |
698 | |
699 | struct bio_set { | |
700 | struct kmem_cache *bio_slab; | |
701 | unsigned int front_pad; | |
702 | ||
8aa6ba2f KO |
703 | mempool_t bio_pool; |
704 | mempool_t bvec_pool; | |
57fb233f | 705 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
8aa6ba2f KO |
706 | mempool_t bio_integrity_pool; |
707 | mempool_t bvec_integrity_pool; | |
57fb233f | 708 | #endif |
df2cb6da KO |
709 | |
710 | /* | |
711 | * Deadlock avoidance for stacking block drivers: see comments in | |
712 | * bio_alloc_bioset() for details | |
713 | */ | |
714 | spinlock_t rescue_lock; | |
715 | struct bio_list rescue_list; | |
716 | struct work_struct rescue_work; | |
717 | struct workqueue_struct *rescue_workqueue; | |
57fb233f KO |
718 | }; |
719 | ||
720 | struct biovec_slab { | |
721 | int nr_vecs; | |
722 | char *name; | |
723 | struct kmem_cache *slab; | |
724 | }; | |
725 | ||
338aa96d KO |
726 | static inline bool bioset_initialized(struct bio_set *bs) |
727 | { | |
728 | return bs->bio_slab != NULL; | |
729 | } | |
730 | ||
57fb233f KO |
731 | /* |
732 | * a small number of entries is fine, not going to be performance critical. | |
733 | * basically we just need to survive | |
734 | */ | |
735 | #define BIO_SPLIT_ENTRIES 2 | |
736 | ||
7ba1ba12 MP |
737 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
738 | ||
d57a5f7c KO |
739 | #define bip_for_each_vec(bvl, bip, iter) \ |
740 | for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter) | |
7ba1ba12 | 741 | |
13f05c8d MP |
742 | #define bio_for_each_integrity_vec(_bvl, _bio, _iter) \ |
743 | for_each_bio(_bio) \ | |
744 | bip_for_each_vec(_bvl, _bio->bi_integrity, _iter) | |
745 | ||
7ba1ba12 | 746 | extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int); |
7ba1ba12 | 747 | extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int); |
e23947bd | 748 | extern bool bio_integrity_prep(struct bio *); |
7ba1ba12 | 749 | extern void bio_integrity_advance(struct bio *, unsigned int); |
fbd08e76 | 750 | extern void bio_integrity_trim(struct bio *); |
1e2a410f | 751 | extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t); |
7878cba9 MP |
752 | extern int bioset_integrity_create(struct bio_set *, int); |
753 | extern void bioset_integrity_free(struct bio_set *); | |
754 | extern void bio_integrity_init(void); | |
7ba1ba12 MP |
755 | |
756 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
757 | ||
c611529e | 758 | static inline void *bio_integrity(struct bio *bio) |
6898e3bd | 759 | { |
c611529e | 760 | return NULL; |
6898e3bd MP |
761 | } |
762 | ||
6898e3bd MP |
763 | static inline int bioset_integrity_create(struct bio_set *bs, int pool_size) |
764 | { | |
765 | return 0; | |
766 | } | |
767 | ||
768 | static inline void bioset_integrity_free (struct bio_set *bs) | |
769 | { | |
770 | return; | |
771 | } | |
772 | ||
e23947bd | 773 | static inline bool bio_integrity_prep(struct bio *bio) |
6898e3bd | 774 | { |
e23947bd | 775 | return true; |
6898e3bd MP |
776 | } |
777 | ||
0c614e2d | 778 | static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
1e2a410f | 779 | gfp_t gfp_mask) |
0c614e2d SR |
780 | { |
781 | return 0; | |
782 | } | |
6898e3bd | 783 | |
6898e3bd MP |
784 | static inline void bio_integrity_advance(struct bio *bio, |
785 | unsigned int bytes_done) | |
786 | { | |
787 | return; | |
788 | } | |
789 | ||
fbd08e76 | 790 | static inline void bio_integrity_trim(struct bio *bio) |
6898e3bd MP |
791 | { |
792 | return; | |
793 | } | |
794 | ||
795 | static inline void bio_integrity_init(void) | |
796 | { | |
797 | return; | |
798 | } | |
7ba1ba12 | 799 | |
c611529e MP |
800 | static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag) |
801 | { | |
802 | return false; | |
803 | } | |
804 | ||
06c1e390 KB |
805 | static inline void *bio_integrity_alloc(struct bio * bio, gfp_t gfp, |
806 | unsigned int nr) | |
807 | { | |
808 | return ERR_PTR(-EINVAL); | |
809 | } | |
810 | ||
811 | static inline int bio_integrity_add_page(struct bio *bio, struct page *page, | |
812 | unsigned int len, unsigned int offset) | |
813 | { | |
814 | return 0; | |
815 | } | |
816 | ||
7ba1ba12 MP |
817 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
818 | ||
0bbb280d JA |
819 | /* |
820 | * Mark a bio as polled. Note that for async polled IO, the caller must | |
821 | * expect -EWOULDBLOCK if we cannot allocate a request (or other resources). | |
822 | * We cannot block waiting for requests on polled IO, as those completions | |
823 | * must be found by the caller. This is different than IRQ driven IO, where | |
824 | * it's safe to wait for IO to complete. | |
825 | */ | |
826 | static inline void bio_set_polled(struct bio *bio, struct kiocb *kiocb) | |
827 | { | |
828 | bio->bi_opf |= REQ_HIPRI; | |
829 | if (!is_sync_kiocb(kiocb)) | |
830 | bio->bi_opf |= REQ_NOWAIT; | |
831 | } | |
832 | ||
02a5e0ac | 833 | #endif /* CONFIG_BLOCK */ |
1da177e4 | 834 | #endif /* __LINUX_BIO_H */ |