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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 | ||
c611529e MP |
303 | enum bip_flags { |
304 | BIP_BLOCK_INTEGRITY = 1 << 0, /* block layer owns integrity data */ | |
305 | BIP_MAPPED_INTEGRITY = 1 << 1, /* ref tag has been remapped */ | |
306 | BIP_CTRL_NOCHECK = 1 << 2, /* disable HBA integrity checking */ | |
307 | BIP_DISK_NOCHECK = 1 << 3, /* disable disk integrity checking */ | |
308 | BIP_IP_CHECKSUM = 1 << 4, /* IP checksum */ | |
309 | }; | |
310 | ||
7ba1ba12 MP |
311 | /* |
312 | * bio integrity payload | |
313 | */ | |
314 | struct bio_integrity_payload { | |
315 | struct bio *bip_bio; /* parent bio */ | |
7ba1ba12 | 316 | |
d57a5f7c | 317 | struct bvec_iter bip_iter; |
7ba1ba12 | 318 | |
7878cba9 | 319 | unsigned short bip_slab; /* slab the bip came from */ |
7ba1ba12 | 320 | unsigned short bip_vcnt; /* # of integrity bio_vecs */ |
cbcd1054 | 321 | unsigned short bip_max_vcnt; /* integrity bio_vec slots */ |
b1f01388 | 322 | unsigned short bip_flags; /* control flags */ |
7ba1ba12 MP |
323 | |
324 | struct work_struct bip_work; /* I/O completion */ | |
6fda981c KO |
325 | |
326 | struct bio_vec *bip_vec; | |
327 | struct bio_vec bip_inline_vecs[0];/* embedded bvec array */ | |
7ba1ba12 | 328 | }; |
18593088 | 329 | |
06c1e390 KB |
330 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
331 | ||
332 | static inline struct bio_integrity_payload *bio_integrity(struct bio *bio) | |
333 | { | |
1eff9d32 | 334 | if (bio->bi_opf & REQ_INTEGRITY) |
06c1e390 KB |
335 | return bio->bi_integrity; |
336 | ||
337 | return NULL; | |
338 | } | |
339 | ||
c611529e MP |
340 | static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag) |
341 | { | |
342 | struct bio_integrity_payload *bip = bio_integrity(bio); | |
343 | ||
344 | if (bip) | |
345 | return bip->bip_flags & flag; | |
346 | ||
347 | return false; | |
348 | } | |
b1f01388 | 349 | |
18593088 MP |
350 | static inline sector_t bip_get_seed(struct bio_integrity_payload *bip) |
351 | { | |
352 | return bip->bip_iter.bi_sector; | |
353 | } | |
354 | ||
355 | static inline void bip_set_seed(struct bio_integrity_payload *bip, | |
356 | sector_t seed) | |
357 | { | |
358 | bip->bip_iter.bi_sector = seed; | |
359 | } | |
360 | ||
7ba1ba12 | 361 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
1da177e4 | 362 | |
6678d83f | 363 | extern void bio_trim(struct bio *bio, int offset, int size); |
20d0189b KO |
364 | extern struct bio *bio_split(struct bio *bio, int sectors, |
365 | gfp_t gfp, struct bio_set *bs); | |
366 | ||
367 | /** | |
368 | * bio_next_split - get next @sectors from a bio, splitting if necessary | |
369 | * @bio: bio to split | |
370 | * @sectors: number of sectors to split from the front of @bio | |
371 | * @gfp: gfp mask | |
372 | * @bs: bio set to allocate from | |
373 | * | |
374 | * Returns a bio representing the next @sectors of @bio - if the bio is smaller | |
375 | * than @sectors, returns the original bio unchanged. | |
376 | */ | |
377 | static inline struct bio *bio_next_split(struct bio *bio, int sectors, | |
378 | gfp_t gfp, struct bio_set *bs) | |
379 | { | |
380 | if (sectors >= bio_sectors(bio)) | |
381 | return bio; | |
382 | ||
383 | return bio_split(bio, sectors, gfp, bs); | |
384 | } | |
385 | ||
011067b0 N |
386 | extern struct bio_set *bioset_create(unsigned int, unsigned int, int flags); |
387 | enum { | |
388 | BIOSET_NEED_BVECS = BIT(0), | |
47e0fb46 | 389 | BIOSET_NEED_RESCUER = BIT(1), |
011067b0 | 390 | }; |
1da177e4 | 391 | extern void bioset_free(struct bio_set *); |
a6c39cb4 | 392 | extern mempool_t *biovec_create_pool(int pool_entries); |
1da177e4 | 393 | |
7a88fa19 | 394 | extern struct bio *bio_alloc_bioset(gfp_t, unsigned int, struct bio_set *); |
1da177e4 LT |
395 | extern void bio_put(struct bio *); |
396 | ||
59d276fe KO |
397 | extern void __bio_clone_fast(struct bio *, struct bio *); |
398 | extern struct bio *bio_clone_fast(struct bio *, gfp_t, struct bio_set *); | |
bf800ef1 KO |
399 | extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs); |
400 | ||
3f86a82a KO |
401 | extern struct bio_set *fs_bio_set; |
402 | ||
403 | static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) | |
404 | { | |
405 | return bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set); | |
406 | } | |
407 | ||
408 | static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs) | |
409 | { | |
410 | return bio_alloc_bioset(gfp_mask, nr_iovecs, NULL); | |
411 | } | |
412 | ||
bf800ef1 KO |
413 | static inline struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask) |
414 | { | |
415 | return bio_clone_bioset(bio, gfp_mask, NULL); | |
416 | ||
417 | } | |
418 | ||
1e3914d4 CH |
419 | extern blk_qc_t submit_bio(struct bio *); |
420 | ||
4246a0b6 CH |
421 | extern void bio_endio(struct bio *); |
422 | ||
423 | static inline void bio_io_error(struct bio *bio) | |
424 | { | |
4e4cbee9 | 425 | bio->bi_status = BLK_STS_IOERR; |
4246a0b6 CH |
426 | bio_endio(bio); |
427 | } | |
428 | ||
03a07c92 GR |
429 | static inline void bio_wouldblock_error(struct bio *bio) |
430 | { | |
431 | bio->bi_status = BLK_STS_AGAIN; | |
4246a0b6 CH |
432 | bio_endio(bio); |
433 | } | |
434 | ||
1da177e4 LT |
435 | struct request_queue; |
436 | extern int bio_phys_segments(struct request_queue *, struct bio *); | |
1da177e4 | 437 | |
4e49ea4a | 438 | extern int submit_bio_wait(struct bio *bio); |
054bdf64 KO |
439 | extern void bio_advance(struct bio *, unsigned); |
440 | ||
3a83f467 ML |
441 | extern void bio_init(struct bio *bio, struct bio_vec *table, |
442 | unsigned short max_vecs); | |
9ae3b3f5 | 443 | extern void bio_uninit(struct bio *); |
f44b48c7 | 444 | extern void bio_reset(struct bio *); |
196d38bc | 445 | void bio_chain(struct bio *, struct bio *); |
1da177e4 LT |
446 | |
447 | extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int); | |
6e68af66 MC |
448 | extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *, |
449 | unsigned int, unsigned int); | |
2cefe4db | 450 | int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter); |
152e283f | 451 | struct rq_map_data; |
f1970baf | 452 | extern struct bio *bio_map_user_iov(struct request_queue *, |
e81cef5d | 453 | struct iov_iter *, gfp_t); |
1da177e4 | 454 | extern void bio_unmap_user(struct bio *); |
df46b9a4 | 455 | extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int, |
27496a8c | 456 | gfp_t); |
68154e90 FT |
457 | extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int, |
458 | gfp_t, int); | |
1da177e4 LT |
459 | extern void bio_set_pages_dirty(struct bio *bio); |
460 | extern void bio_check_pages_dirty(struct bio *bio); | |
2d4dc890 | 461 | |
d62e26b3 JA |
462 | void generic_start_io_acct(struct request_queue *q, int rw, |
463 | unsigned long sectors, struct hd_struct *part); | |
464 | void generic_end_io_acct(struct request_queue *q, int rw, | |
465 | struct hd_struct *part, | |
466 | unsigned long start_time); | |
394ffa50 | 467 | |
2d4dc890 IL |
468 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
469 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
470 | #endif | |
471 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
472 | extern void bio_flush_dcache_pages(struct bio *bi); | |
473 | #else | |
474 | static inline void bio_flush_dcache_pages(struct bio *bi) | |
475 | { | |
476 | } | |
477 | #endif | |
478 | ||
16ac3d63 | 479 | extern void bio_copy_data(struct bio *dst, struct bio *src); |
a0787606 | 480 | extern int bio_alloc_pages(struct bio *bio, gfp_t gfp); |
491221f8 | 481 | extern void bio_free_pages(struct bio *bio); |
16ac3d63 | 482 | |
152e283f | 483 | extern struct bio *bio_copy_user_iov(struct request_queue *, |
86d564c8 | 484 | struct rq_map_data *, |
e81cef5d | 485 | struct iov_iter *, |
26e49cfc | 486 | gfp_t); |
1da177e4 LT |
487 | extern int bio_uncopy_user(struct bio *); |
488 | void zero_fill_bio(struct bio *bio); | |
9f060e22 KO |
489 | extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *); |
490 | extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int); | |
7ba1ba12 | 491 | extern unsigned int bvec_nr_vecs(unsigned short idx); |
51d654e1 | 492 | |
74d46992 CH |
493 | #define bio_set_dev(bio, bdev) \ |
494 | do { \ | |
111be883 SL |
495 | if ((bio)->bi_disk != (bdev)->bd_disk) \ |
496 | bio_clear_flag(bio, BIO_THROTTLED);\ | |
74d46992 CH |
497 | (bio)->bi_disk = (bdev)->bd_disk; \ |
498 | (bio)->bi_partno = (bdev)->bd_partno; \ | |
499 | } while (0) | |
500 | ||
501 | #define bio_copy_dev(dst, src) \ | |
502 | do { \ | |
503 | (dst)->bi_disk = (src)->bi_disk; \ | |
504 | (dst)->bi_partno = (src)->bi_partno; \ | |
505 | } while (0) | |
506 | ||
507 | #define bio_dev(bio) \ | |
508 | disk_devt((bio)->bi_disk) | |
509 | ||
510 | #define bio_devname(bio, buf) \ | |
511 | __bdevname(bio_dev(bio), (buf)) | |
512 | ||
852c788f | 513 | #ifdef CONFIG_BLK_CGROUP |
1d933cf0 | 514 | int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css); |
852c788f | 515 | void bio_disassociate_task(struct bio *bio); |
20bd723e | 516 | void bio_clone_blkcg_association(struct bio *dst, struct bio *src); |
852c788f | 517 | #else /* CONFIG_BLK_CGROUP */ |
1d933cf0 TH |
518 | static inline int bio_associate_blkcg(struct bio *bio, |
519 | struct cgroup_subsys_state *blkcg_css) { return 0; } | |
852c788f | 520 | static inline void bio_disassociate_task(struct bio *bio) { } |
20bd723e PV |
521 | static inline void bio_clone_blkcg_association(struct bio *dst, |
522 | struct bio *src) { } | |
852c788f TH |
523 | #endif /* CONFIG_BLK_CGROUP */ |
524 | ||
1da177e4 LT |
525 | #ifdef CONFIG_HIGHMEM |
526 | /* | |
20b636bf AB |
527 | * remember never ever reenable interrupts between a bvec_kmap_irq and |
528 | * bvec_kunmap_irq! | |
1da177e4 | 529 | */ |
4f570f99 | 530 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
1da177e4 LT |
531 | { |
532 | unsigned long addr; | |
533 | ||
534 | /* | |
535 | * might not be a highmem page, but the preempt/irq count | |
536 | * balancing is a lot nicer this way | |
537 | */ | |
538 | local_irq_save(*flags); | |
e8e3c3d6 | 539 | addr = (unsigned long) kmap_atomic(bvec->bv_page); |
1da177e4 LT |
540 | |
541 | BUG_ON(addr & ~PAGE_MASK); | |
542 | ||
543 | return (char *) addr + bvec->bv_offset; | |
544 | } | |
545 | ||
4f570f99 | 546 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) |
1da177e4 LT |
547 | { |
548 | unsigned long ptr = (unsigned long) buffer & PAGE_MASK; | |
549 | ||
e8e3c3d6 | 550 | kunmap_atomic((void *) ptr); |
1da177e4 LT |
551 | local_irq_restore(*flags); |
552 | } | |
553 | ||
554 | #else | |
11a691be GU |
555 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
556 | { | |
557 | return page_address(bvec->bv_page) + bvec->bv_offset; | |
558 | } | |
559 | ||
560 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) | |
561 | { | |
562 | *flags = 0; | |
563 | } | |
1da177e4 LT |
564 | #endif |
565 | ||
8f3d8ba2 | 566 | /* |
e686307f | 567 | * BIO list management for use by remapping drivers (e.g. DM or MD) and loop. |
8f3d8ba2 CH |
568 | * |
569 | * A bio_list anchors a singly-linked list of bios chained through the bi_next | |
570 | * member of the bio. The bio_list also caches the last list member to allow | |
571 | * fast access to the tail. | |
572 | */ | |
573 | struct bio_list { | |
574 | struct bio *head; | |
575 | struct bio *tail; | |
576 | }; | |
577 | ||
578 | static inline int bio_list_empty(const struct bio_list *bl) | |
579 | { | |
580 | return bl->head == NULL; | |
581 | } | |
582 | ||
583 | static inline void bio_list_init(struct bio_list *bl) | |
584 | { | |
585 | bl->head = bl->tail = NULL; | |
586 | } | |
587 | ||
320ae51f JA |
588 | #define BIO_EMPTY_LIST { NULL, NULL } |
589 | ||
8f3d8ba2 CH |
590 | #define bio_list_for_each(bio, bl) \ |
591 | for (bio = (bl)->head; bio; bio = bio->bi_next) | |
592 | ||
593 | static inline unsigned bio_list_size(const struct bio_list *bl) | |
594 | { | |
595 | unsigned sz = 0; | |
596 | struct bio *bio; | |
597 | ||
598 | bio_list_for_each(bio, bl) | |
599 | sz++; | |
600 | ||
601 | return sz; | |
602 | } | |
603 | ||
604 | static inline void bio_list_add(struct bio_list *bl, struct bio *bio) | |
605 | { | |
606 | bio->bi_next = NULL; | |
607 | ||
608 | if (bl->tail) | |
609 | bl->tail->bi_next = bio; | |
610 | else | |
611 | bl->head = bio; | |
612 | ||
613 | bl->tail = bio; | |
614 | } | |
615 | ||
616 | static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio) | |
617 | { | |
618 | bio->bi_next = bl->head; | |
619 | ||
620 | bl->head = bio; | |
621 | ||
622 | if (!bl->tail) | |
623 | bl->tail = bio; | |
624 | } | |
625 | ||
626 | static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2) | |
627 | { | |
628 | if (!bl2->head) | |
629 | return; | |
630 | ||
631 | if (bl->tail) | |
632 | bl->tail->bi_next = bl2->head; | |
633 | else | |
634 | bl->head = bl2->head; | |
635 | ||
636 | bl->tail = bl2->tail; | |
637 | } | |
638 | ||
639 | static inline void bio_list_merge_head(struct bio_list *bl, | |
640 | struct bio_list *bl2) | |
641 | { | |
642 | if (!bl2->head) | |
643 | return; | |
644 | ||
645 | if (bl->head) | |
646 | bl2->tail->bi_next = bl->head; | |
647 | else | |
648 | bl->tail = bl2->tail; | |
649 | ||
650 | bl->head = bl2->head; | |
651 | } | |
652 | ||
13685a16 GU |
653 | static inline struct bio *bio_list_peek(struct bio_list *bl) |
654 | { | |
655 | return bl->head; | |
656 | } | |
657 | ||
8f3d8ba2 CH |
658 | static inline struct bio *bio_list_pop(struct bio_list *bl) |
659 | { | |
660 | struct bio *bio = bl->head; | |
661 | ||
662 | if (bio) { | |
663 | bl->head = bl->head->bi_next; | |
664 | if (!bl->head) | |
665 | bl->tail = NULL; | |
666 | ||
667 | bio->bi_next = NULL; | |
668 | } | |
669 | ||
670 | return bio; | |
671 | } | |
672 | ||
673 | static inline struct bio *bio_list_get(struct bio_list *bl) | |
674 | { | |
675 | struct bio *bio = bl->head; | |
676 | ||
677 | bl->head = bl->tail = NULL; | |
678 | ||
679 | return bio; | |
680 | } | |
681 | ||
0ef5a50c MS |
682 | /* |
683 | * Increment chain count for the bio. Make sure the CHAIN flag update | |
684 | * is visible before the raised count. | |
685 | */ | |
686 | static inline void bio_inc_remaining(struct bio *bio) | |
687 | { | |
688 | bio_set_flag(bio, BIO_CHAIN); | |
689 | smp_mb__before_atomic(); | |
690 | atomic_inc(&bio->__bi_remaining); | |
691 | } | |
692 | ||
57fb233f KO |
693 | /* |
694 | * bio_set is used to allow other portions of the IO system to | |
695 | * allocate their own private memory pools for bio and iovec structures. | |
696 | * These memory pools in turn all allocate from the bio_slab | |
697 | * and the bvec_slabs[]. | |
698 | */ | |
699 | #define BIO_POOL_SIZE 2 | |
57fb233f KO |
700 | |
701 | struct bio_set { | |
702 | struct kmem_cache *bio_slab; | |
703 | unsigned int front_pad; | |
704 | ||
705 | mempool_t *bio_pool; | |
9f060e22 | 706 | mempool_t *bvec_pool; |
57fb233f KO |
707 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
708 | mempool_t *bio_integrity_pool; | |
9f060e22 | 709 | mempool_t *bvec_integrity_pool; |
57fb233f | 710 | #endif |
df2cb6da KO |
711 | |
712 | /* | |
713 | * Deadlock avoidance for stacking block drivers: see comments in | |
714 | * bio_alloc_bioset() for details | |
715 | */ | |
716 | spinlock_t rescue_lock; | |
717 | struct bio_list rescue_list; | |
718 | struct work_struct rescue_work; | |
719 | struct workqueue_struct *rescue_workqueue; | |
57fb233f KO |
720 | }; |
721 | ||
722 | struct biovec_slab { | |
723 | int nr_vecs; | |
724 | char *name; | |
725 | struct kmem_cache *slab; | |
726 | }; | |
727 | ||
728 | /* | |
729 | * a small number of entries is fine, not going to be performance critical. | |
730 | * basically we just need to survive | |
731 | */ | |
732 | #define BIO_SPLIT_ENTRIES 2 | |
733 | ||
7ba1ba12 MP |
734 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
735 | ||
d57a5f7c KO |
736 | #define bip_for_each_vec(bvl, bip, iter) \ |
737 | for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter) | |
7ba1ba12 | 738 | |
13f05c8d MP |
739 | #define bio_for_each_integrity_vec(_bvl, _bio, _iter) \ |
740 | for_each_bio(_bio) \ | |
741 | bip_for_each_vec(_bvl, _bio->bi_integrity, _iter) | |
742 | ||
7ba1ba12 | 743 | extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int); |
7ba1ba12 | 744 | extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int); |
e23947bd | 745 | extern bool bio_integrity_prep(struct bio *); |
7ba1ba12 | 746 | extern void bio_integrity_advance(struct bio *, unsigned int); |
fbd08e76 | 747 | extern void bio_integrity_trim(struct bio *); |
1e2a410f | 748 | extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t); |
7878cba9 MP |
749 | extern int bioset_integrity_create(struct bio_set *, int); |
750 | extern void bioset_integrity_free(struct bio_set *); | |
751 | extern void bio_integrity_init(void); | |
7ba1ba12 MP |
752 | |
753 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
754 | ||
c611529e | 755 | static inline void *bio_integrity(struct bio *bio) |
6898e3bd | 756 | { |
c611529e | 757 | return NULL; |
6898e3bd MP |
758 | } |
759 | ||
6898e3bd MP |
760 | static inline int bioset_integrity_create(struct bio_set *bs, int pool_size) |
761 | { | |
762 | return 0; | |
763 | } | |
764 | ||
765 | static inline void bioset_integrity_free (struct bio_set *bs) | |
766 | { | |
767 | return; | |
768 | } | |
769 | ||
e23947bd | 770 | static inline bool bio_integrity_prep(struct bio *bio) |
6898e3bd | 771 | { |
e23947bd | 772 | return true; |
6898e3bd MP |
773 | } |
774 | ||
0c614e2d | 775 | static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
1e2a410f | 776 | gfp_t gfp_mask) |
0c614e2d SR |
777 | { |
778 | return 0; | |
779 | } | |
6898e3bd | 780 | |
6898e3bd MP |
781 | static inline void bio_integrity_advance(struct bio *bio, |
782 | unsigned int bytes_done) | |
783 | { | |
784 | return; | |
785 | } | |
786 | ||
fbd08e76 | 787 | static inline void bio_integrity_trim(struct bio *bio) |
6898e3bd MP |
788 | { |
789 | return; | |
790 | } | |
791 | ||
792 | static inline void bio_integrity_init(void) | |
793 | { | |
794 | return; | |
795 | } | |
7ba1ba12 | 796 | |
c611529e MP |
797 | static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag) |
798 | { | |
799 | return false; | |
800 | } | |
801 | ||
06c1e390 KB |
802 | static inline void *bio_integrity_alloc(struct bio * bio, gfp_t gfp, |
803 | unsigned int nr) | |
804 | { | |
805 | return ERR_PTR(-EINVAL); | |
806 | } | |
807 | ||
808 | static inline int bio_integrity_add_page(struct bio *bio, struct page *page, | |
809 | unsigned int len, unsigned int offset) | |
810 | { | |
811 | return 0; | |
812 | } | |
813 | ||
7ba1ba12 MP |
814 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
815 | ||
02a5e0ac | 816 | #endif /* CONFIG_BLOCK */ |
1da177e4 | 817 | #endif /* __LINUX_BIO_H */ |