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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 | 125 | |
a5db5c8f CH |
126 | static inline bool bio_full(struct bio *bio) |
127 | { | |
128 | return bio->bi_vcnt >= bio->bi_max_vecs; | |
129 | } | |
130 | ||
1da177e4 LT |
131 | /* |
132 | * will die | |
133 | */ | |
1da177e4 LT |
134 | #define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset) |
135 | ||
1da177e4 LT |
136 | /* |
137 | * merge helpers etc | |
138 | */ | |
139 | ||
f92131c3 JF |
140 | /* Default implementation of BIOVEC_PHYS_MERGEABLE */ |
141 | #define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ | |
142 | ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2))) | |
143 | ||
1da177e4 LT |
144 | /* |
145 | * allow arch override, for eg virtualized architectures (put in asm/io.h) | |
146 | */ | |
147 | #ifndef BIOVEC_PHYS_MERGEABLE | |
148 | #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ | |
f92131c3 | 149 | __BIOVEC_PHYS_MERGEABLE(vec1, vec2) |
1da177e4 LT |
150 | #endif |
151 | ||
1da177e4 LT |
152 | #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \ |
153 | (((addr1) | (mask)) == (((addr2) - 1) | (mask))) | |
154 | #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \ | |
ae03bf63 | 155 | __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q))) |
1da177e4 | 156 | |
d74c6d51 KO |
157 | /* |
158 | * drivers should _never_ use the all version - the bio may have been split | |
159 | * before it got to the driver and the driver won't own all of it | |
160 | */ | |
161 | #define bio_for_each_segment_all(bvl, bio, i) \ | |
f619d254 | 162 | for (i = 0, bvl = (bio)->bi_io_vec; i < (bio)->bi_vcnt; i++, bvl++) |
d74c6d51 | 163 | |
4550dd6c KO |
164 | static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter, |
165 | unsigned bytes) | |
166 | { | |
167 | iter->bi_sector += bytes >> 9; | |
168 | ||
f9df1cd9 | 169 | if (bio_no_advance_iter(bio)) { |
4550dd6c | 170 | iter->bi_size -= bytes; |
f9df1cd9 DM |
171 | iter->bi_done += bytes; |
172 | } else { | |
4550dd6c | 173 | bvec_iter_advance(bio->bi_io_vec, iter, bytes); |
b1fb2c52 DM |
174 | /* TODO: It is reasonable to complete bio with error here. */ |
175 | } | |
4550dd6c KO |
176 | } |
177 | ||
f9df1cd9 DM |
178 | static inline bool bio_rewind_iter(struct bio *bio, struct bvec_iter *iter, |
179 | unsigned int bytes) | |
180 | { | |
181 | iter->bi_sector -= bytes >> 9; | |
182 | ||
183 | if (bio_no_advance_iter(bio)) { | |
184 | iter->bi_size += bytes; | |
185 | iter->bi_done -= bytes; | |
186 | return true; | |
187 | } | |
188 | ||
189 | return bvec_iter_rewind(bio->bi_io_vec, iter, bytes); | |
190 | } | |
191 | ||
7988613b KO |
192 | #define __bio_for_each_segment(bvl, bio, iter, start) \ |
193 | for (iter = (start); \ | |
4550dd6c KO |
194 | (iter).bi_size && \ |
195 | ((bvl = bio_iter_iovec((bio), (iter))), 1); \ | |
196 | bio_advance_iter((bio), &(iter), (bvl).bv_len)) | |
7988613b KO |
197 | |
198 | #define bio_for_each_segment(bvl, bio, iter) \ | |
199 | __bio_for_each_segment(bvl, bio, iter, (bio)->bi_iter) | |
200 | ||
4550dd6c | 201 | #define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len) |
1da177e4 | 202 | |
f4595875 | 203 | static inline unsigned bio_segments(struct bio *bio) |
458b76ed KO |
204 | { |
205 | unsigned segs = 0; | |
206 | struct bio_vec bv; | |
207 | struct bvec_iter iter; | |
208 | ||
8423ae3d | 209 | /* |
a6f0788e CK |
210 | * We special case discard/write same/write zeroes, because they |
211 | * interpret bi_size differently: | |
8423ae3d KO |
212 | */ |
213 | ||
a6f0788e CK |
214 | switch (bio_op(bio)) { |
215 | case REQ_OP_DISCARD: | |
216 | case REQ_OP_SECURE_ERASE: | |
a6f0788e | 217 | case REQ_OP_WRITE_ZEROES: |
f9d03f96 CH |
218 | return 0; |
219 | case REQ_OP_WRITE_SAME: | |
8423ae3d | 220 | return 1; |
a6f0788e CK |
221 | default: |
222 | break; | |
223 | } | |
8423ae3d | 224 | |
f4595875 | 225 | bio_for_each_segment(bv, bio, iter) |
458b76ed KO |
226 | segs++; |
227 | ||
228 | return segs; | |
229 | } | |
230 | ||
1da177e4 LT |
231 | /* |
232 | * get a reference to a bio, so it won't disappear. the intended use is | |
233 | * something like: | |
234 | * | |
235 | * bio_get(bio); | |
236 | * submit_bio(rw, bio); | |
237 | * if (bio->bi_flags ...) | |
238 | * do_something | |
239 | * bio_put(bio); | |
240 | * | |
241 | * without the bio_get(), it could potentially complete I/O before submit_bio | |
242 | * returns. and then bio would be freed memory when if (bio->bi_flags ...) | |
243 | * runs | |
244 | */ | |
dac56212 JA |
245 | static inline void bio_get(struct bio *bio) |
246 | { | |
247 | bio->bi_flags |= (1 << BIO_REFFED); | |
248 | smp_mb__before_atomic(); | |
249 | atomic_inc(&bio->__bi_cnt); | |
250 | } | |
251 | ||
252 | static inline void bio_cnt_set(struct bio *bio, unsigned int count) | |
253 | { | |
254 | if (count != 1) { | |
255 | bio->bi_flags |= (1 << BIO_REFFED); | |
256 | smp_mb__before_atomic(); | |
257 | } | |
258 | atomic_set(&bio->__bi_cnt, count); | |
259 | } | |
1da177e4 | 260 | |
b7c44ed9 JA |
261 | static inline bool bio_flagged(struct bio *bio, unsigned int bit) |
262 | { | |
2c68f6dc | 263 | return (bio->bi_flags & (1U << bit)) != 0; |
b7c44ed9 JA |
264 | } |
265 | ||
266 | static inline void bio_set_flag(struct bio *bio, unsigned int bit) | |
267 | { | |
2c68f6dc | 268 | bio->bi_flags |= (1U << bit); |
b7c44ed9 JA |
269 | } |
270 | ||
271 | static inline void bio_clear_flag(struct bio *bio, unsigned int bit) | |
272 | { | |
2c68f6dc | 273 | bio->bi_flags &= ~(1U << bit); |
b7c44ed9 JA |
274 | } |
275 | ||
7bcd79ac ML |
276 | static inline void bio_get_first_bvec(struct bio *bio, struct bio_vec *bv) |
277 | { | |
278 | *bv = bio_iovec(bio); | |
279 | } | |
280 | ||
281 | static inline void bio_get_last_bvec(struct bio *bio, struct bio_vec *bv) | |
282 | { | |
283 | struct bvec_iter iter = bio->bi_iter; | |
284 | int idx; | |
285 | ||
7bcd79ac ML |
286 | if (unlikely(!bio_multiple_segments(bio))) { |
287 | *bv = bio_iovec(bio); | |
288 | return; | |
289 | } | |
290 | ||
291 | bio_advance_iter(bio, &iter, iter.bi_size); | |
292 | ||
293 | if (!iter.bi_bvec_done) | |
294 | idx = iter.bi_idx - 1; | |
295 | else /* in the middle of bvec */ | |
296 | idx = iter.bi_idx; | |
297 | ||
298 | *bv = bio->bi_io_vec[idx]; | |
299 | ||
300 | /* | |
301 | * iter.bi_bvec_done records actual length of the last bvec | |
302 | * if this bio ends in the middle of one io vector | |
303 | */ | |
304 | if (iter.bi_bvec_done) | |
305 | bv->bv_len = iter.bi_bvec_done; | |
306 | } | |
307 | ||
c611529e MP |
308 | enum bip_flags { |
309 | BIP_BLOCK_INTEGRITY = 1 << 0, /* block layer owns integrity data */ | |
310 | BIP_MAPPED_INTEGRITY = 1 << 1, /* ref tag has been remapped */ | |
311 | BIP_CTRL_NOCHECK = 1 << 2, /* disable HBA integrity checking */ | |
312 | BIP_DISK_NOCHECK = 1 << 3, /* disable disk integrity checking */ | |
313 | BIP_IP_CHECKSUM = 1 << 4, /* IP checksum */ | |
314 | }; | |
315 | ||
7ba1ba12 MP |
316 | /* |
317 | * bio integrity payload | |
318 | */ | |
319 | struct bio_integrity_payload { | |
320 | struct bio *bip_bio; /* parent bio */ | |
7ba1ba12 | 321 | |
d57a5f7c | 322 | struct bvec_iter bip_iter; |
7ba1ba12 | 323 | |
7878cba9 | 324 | unsigned short bip_slab; /* slab the bip came from */ |
7ba1ba12 | 325 | unsigned short bip_vcnt; /* # of integrity bio_vecs */ |
cbcd1054 | 326 | unsigned short bip_max_vcnt; /* integrity bio_vec slots */ |
b1f01388 | 327 | unsigned short bip_flags; /* control flags */ |
7ba1ba12 MP |
328 | |
329 | struct work_struct bip_work; /* I/O completion */ | |
6fda981c KO |
330 | |
331 | struct bio_vec *bip_vec; | |
332 | struct bio_vec bip_inline_vecs[0];/* embedded bvec array */ | |
7ba1ba12 | 333 | }; |
18593088 | 334 | |
06c1e390 KB |
335 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
336 | ||
337 | static inline struct bio_integrity_payload *bio_integrity(struct bio *bio) | |
338 | { | |
1eff9d32 | 339 | if (bio->bi_opf & REQ_INTEGRITY) |
06c1e390 KB |
340 | return bio->bi_integrity; |
341 | ||
342 | return NULL; | |
343 | } | |
344 | ||
c611529e MP |
345 | static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag) |
346 | { | |
347 | struct bio_integrity_payload *bip = bio_integrity(bio); | |
348 | ||
349 | if (bip) | |
350 | return bip->bip_flags & flag; | |
351 | ||
352 | return false; | |
353 | } | |
b1f01388 | 354 | |
18593088 MP |
355 | static inline sector_t bip_get_seed(struct bio_integrity_payload *bip) |
356 | { | |
357 | return bip->bip_iter.bi_sector; | |
358 | } | |
359 | ||
360 | static inline void bip_set_seed(struct bio_integrity_payload *bip, | |
361 | sector_t seed) | |
362 | { | |
363 | bip->bip_iter.bi_sector = seed; | |
364 | } | |
365 | ||
7ba1ba12 | 366 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
1da177e4 | 367 | |
6678d83f | 368 | extern void bio_trim(struct bio *bio, int offset, int size); |
20d0189b KO |
369 | extern struct bio *bio_split(struct bio *bio, int sectors, |
370 | gfp_t gfp, struct bio_set *bs); | |
371 | ||
372 | /** | |
373 | * bio_next_split - get next @sectors from a bio, splitting if necessary | |
374 | * @bio: bio to split | |
375 | * @sectors: number of sectors to split from the front of @bio | |
376 | * @gfp: gfp mask | |
377 | * @bs: bio set to allocate from | |
378 | * | |
379 | * Returns a bio representing the next @sectors of @bio - if the bio is smaller | |
380 | * than @sectors, returns the original bio unchanged. | |
381 | */ | |
382 | static inline struct bio *bio_next_split(struct bio *bio, int sectors, | |
383 | gfp_t gfp, struct bio_set *bs) | |
384 | { | |
385 | if (sectors >= bio_sectors(bio)) | |
386 | return bio; | |
387 | ||
388 | return bio_split(bio, sectors, gfp, bs); | |
389 | } | |
390 | ||
011067b0 N |
391 | extern struct bio_set *bioset_create(unsigned int, unsigned int, int flags); |
392 | enum { | |
393 | BIOSET_NEED_BVECS = BIT(0), | |
47e0fb46 | 394 | BIOSET_NEED_RESCUER = BIT(1), |
011067b0 | 395 | }; |
1da177e4 | 396 | extern void bioset_free(struct bio_set *); |
a6c39cb4 | 397 | extern mempool_t *biovec_create_pool(int pool_entries); |
1da177e4 | 398 | |
7a88fa19 | 399 | extern struct bio *bio_alloc_bioset(gfp_t, unsigned int, struct bio_set *); |
1da177e4 LT |
400 | extern void bio_put(struct bio *); |
401 | ||
59d276fe KO |
402 | extern void __bio_clone_fast(struct bio *, struct bio *); |
403 | extern struct bio *bio_clone_fast(struct bio *, gfp_t, struct bio_set *); | |
bf800ef1 KO |
404 | extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs); |
405 | ||
3f86a82a KO |
406 | extern struct bio_set *fs_bio_set; |
407 | ||
408 | static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) | |
409 | { | |
410 | return bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set); | |
411 | } | |
412 | ||
413 | static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs) | |
414 | { | |
415 | return bio_alloc_bioset(gfp_mask, nr_iovecs, NULL); | |
416 | } | |
417 | ||
bf800ef1 KO |
418 | static inline struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask) |
419 | { | |
420 | return bio_clone_bioset(bio, gfp_mask, NULL); | |
421 | ||
422 | } | |
423 | ||
1e3914d4 CH |
424 | extern blk_qc_t submit_bio(struct bio *); |
425 | ||
4246a0b6 CH |
426 | extern void bio_endio(struct bio *); |
427 | ||
428 | static inline void bio_io_error(struct bio *bio) | |
429 | { | |
4e4cbee9 | 430 | bio->bi_status = BLK_STS_IOERR; |
4246a0b6 CH |
431 | bio_endio(bio); |
432 | } | |
433 | ||
03a07c92 GR |
434 | static inline void bio_wouldblock_error(struct bio *bio) |
435 | { | |
436 | bio->bi_status = BLK_STS_AGAIN; | |
4246a0b6 CH |
437 | bio_endio(bio); |
438 | } | |
439 | ||
1da177e4 LT |
440 | struct request_queue; |
441 | extern int bio_phys_segments(struct request_queue *, struct bio *); | |
1da177e4 | 442 | |
4e49ea4a | 443 | extern int submit_bio_wait(struct bio *bio); |
054bdf64 KO |
444 | extern void bio_advance(struct bio *, unsigned); |
445 | ||
3a83f467 ML |
446 | extern void bio_init(struct bio *bio, struct bio_vec *table, |
447 | unsigned short max_vecs); | |
9ae3b3f5 | 448 | extern void bio_uninit(struct bio *); |
f44b48c7 | 449 | extern void bio_reset(struct bio *); |
196d38bc | 450 | void bio_chain(struct bio *, struct bio *); |
1da177e4 LT |
451 | |
452 | extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int); | |
6e68af66 MC |
453 | extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *, |
454 | unsigned int, unsigned int); | |
a5db5c8f CH |
455 | bool __bio_try_merge_page(struct bio *bio, struct page *page, |
456 | unsigned int len, unsigned int off); | |
457 | void __bio_add_page(struct bio *bio, struct page *page, | |
458 | unsigned int len, unsigned int off); | |
2cefe4db | 459 | int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter); |
152e283f | 460 | struct rq_map_data; |
f1970baf | 461 | extern struct bio *bio_map_user_iov(struct request_queue *, |
e81cef5d | 462 | struct iov_iter *, gfp_t); |
1da177e4 | 463 | extern void bio_unmap_user(struct bio *); |
df46b9a4 | 464 | extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int, |
27496a8c | 465 | gfp_t); |
68154e90 FT |
466 | extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int, |
467 | gfp_t, int); | |
1da177e4 LT |
468 | extern void bio_set_pages_dirty(struct bio *bio); |
469 | extern void bio_check_pages_dirty(struct bio *bio); | |
2d4dc890 | 470 | |
d62e26b3 JA |
471 | void generic_start_io_acct(struct request_queue *q, int rw, |
472 | unsigned long sectors, struct hd_struct *part); | |
473 | void generic_end_io_acct(struct request_queue *q, int rw, | |
474 | struct hd_struct *part, | |
475 | unsigned long start_time); | |
394ffa50 | 476 | |
2d4dc890 IL |
477 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
478 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
479 | #endif | |
480 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
481 | extern void bio_flush_dcache_pages(struct bio *bi); | |
482 | #else | |
483 | static inline void bio_flush_dcache_pages(struct bio *bi) | |
484 | { | |
485 | } | |
486 | #endif | |
487 | ||
16ac3d63 | 488 | extern void bio_copy_data(struct bio *dst, struct bio *src); |
a0787606 | 489 | extern int bio_alloc_pages(struct bio *bio, gfp_t gfp); |
491221f8 | 490 | extern void bio_free_pages(struct bio *bio); |
16ac3d63 | 491 | |
152e283f | 492 | extern struct bio *bio_copy_user_iov(struct request_queue *, |
86d564c8 | 493 | struct rq_map_data *, |
e81cef5d | 494 | struct iov_iter *, |
26e49cfc | 495 | gfp_t); |
1da177e4 LT |
496 | extern int bio_uncopy_user(struct bio *); |
497 | void zero_fill_bio(struct bio *bio); | |
9f060e22 KO |
498 | extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *); |
499 | extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int); | |
7ba1ba12 | 500 | extern unsigned int bvec_nr_vecs(unsigned short idx); |
68060090 | 501 | extern const char *bio_devname(struct bio *bio, char *buffer); |
51d654e1 | 502 | |
74d46992 CH |
503 | #define bio_set_dev(bio, bdev) \ |
504 | do { \ | |
111be883 SL |
505 | if ((bio)->bi_disk != (bdev)->bd_disk) \ |
506 | bio_clear_flag(bio, BIO_THROTTLED);\ | |
74d46992 CH |
507 | (bio)->bi_disk = (bdev)->bd_disk; \ |
508 | (bio)->bi_partno = (bdev)->bd_partno; \ | |
509 | } while (0) | |
510 | ||
511 | #define bio_copy_dev(dst, src) \ | |
512 | do { \ | |
513 | (dst)->bi_disk = (src)->bi_disk; \ | |
514 | (dst)->bi_partno = (src)->bi_partno; \ | |
515 | } while (0) | |
516 | ||
517 | #define bio_dev(bio) \ | |
518 | disk_devt((bio)->bi_disk) | |
519 | ||
852c788f | 520 | #ifdef CONFIG_BLK_CGROUP |
1d933cf0 | 521 | int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css); |
852c788f | 522 | void bio_disassociate_task(struct bio *bio); |
20bd723e | 523 | void bio_clone_blkcg_association(struct bio *dst, struct bio *src); |
852c788f | 524 | #else /* CONFIG_BLK_CGROUP */ |
1d933cf0 TH |
525 | static inline int bio_associate_blkcg(struct bio *bio, |
526 | struct cgroup_subsys_state *blkcg_css) { return 0; } | |
852c788f | 527 | static inline void bio_disassociate_task(struct bio *bio) { } |
20bd723e PV |
528 | static inline void bio_clone_blkcg_association(struct bio *dst, |
529 | struct bio *src) { } | |
852c788f TH |
530 | #endif /* CONFIG_BLK_CGROUP */ |
531 | ||
1da177e4 LT |
532 | #ifdef CONFIG_HIGHMEM |
533 | /* | |
20b636bf AB |
534 | * remember never ever reenable interrupts between a bvec_kmap_irq and |
535 | * bvec_kunmap_irq! | |
1da177e4 | 536 | */ |
4f570f99 | 537 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
1da177e4 LT |
538 | { |
539 | unsigned long addr; | |
540 | ||
541 | /* | |
542 | * might not be a highmem page, but the preempt/irq count | |
543 | * balancing is a lot nicer this way | |
544 | */ | |
545 | local_irq_save(*flags); | |
e8e3c3d6 | 546 | addr = (unsigned long) kmap_atomic(bvec->bv_page); |
1da177e4 LT |
547 | |
548 | BUG_ON(addr & ~PAGE_MASK); | |
549 | ||
550 | return (char *) addr + bvec->bv_offset; | |
551 | } | |
552 | ||
4f570f99 | 553 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) |
1da177e4 LT |
554 | { |
555 | unsigned long ptr = (unsigned long) buffer & PAGE_MASK; | |
556 | ||
e8e3c3d6 | 557 | kunmap_atomic((void *) ptr); |
1da177e4 LT |
558 | local_irq_restore(*flags); |
559 | } | |
560 | ||
561 | #else | |
11a691be GU |
562 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
563 | { | |
564 | return page_address(bvec->bv_page) + bvec->bv_offset; | |
565 | } | |
566 | ||
567 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) | |
568 | { | |
569 | *flags = 0; | |
570 | } | |
1da177e4 LT |
571 | #endif |
572 | ||
8f3d8ba2 | 573 | /* |
e686307f | 574 | * BIO list management for use by remapping drivers (e.g. DM or MD) and loop. |
8f3d8ba2 CH |
575 | * |
576 | * A bio_list anchors a singly-linked list of bios chained through the bi_next | |
577 | * member of the bio. The bio_list also caches the last list member to allow | |
578 | * fast access to the tail. | |
579 | */ | |
580 | struct bio_list { | |
581 | struct bio *head; | |
582 | struct bio *tail; | |
583 | }; | |
584 | ||
585 | static inline int bio_list_empty(const struct bio_list *bl) | |
586 | { | |
587 | return bl->head == NULL; | |
588 | } | |
589 | ||
590 | static inline void bio_list_init(struct bio_list *bl) | |
591 | { | |
592 | bl->head = bl->tail = NULL; | |
593 | } | |
594 | ||
320ae51f JA |
595 | #define BIO_EMPTY_LIST { NULL, NULL } |
596 | ||
8f3d8ba2 CH |
597 | #define bio_list_for_each(bio, bl) \ |
598 | for (bio = (bl)->head; bio; bio = bio->bi_next) | |
599 | ||
600 | static inline unsigned bio_list_size(const struct bio_list *bl) | |
601 | { | |
602 | unsigned sz = 0; | |
603 | struct bio *bio; | |
604 | ||
605 | bio_list_for_each(bio, bl) | |
606 | sz++; | |
607 | ||
608 | return sz; | |
609 | } | |
610 | ||
611 | static inline void bio_list_add(struct bio_list *bl, struct bio *bio) | |
612 | { | |
613 | bio->bi_next = NULL; | |
614 | ||
615 | if (bl->tail) | |
616 | bl->tail->bi_next = bio; | |
617 | else | |
618 | bl->head = bio; | |
619 | ||
620 | bl->tail = bio; | |
621 | } | |
622 | ||
623 | static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio) | |
624 | { | |
625 | bio->bi_next = bl->head; | |
626 | ||
627 | bl->head = bio; | |
628 | ||
629 | if (!bl->tail) | |
630 | bl->tail = bio; | |
631 | } | |
632 | ||
633 | static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2) | |
634 | { | |
635 | if (!bl2->head) | |
636 | return; | |
637 | ||
638 | if (bl->tail) | |
639 | bl->tail->bi_next = bl2->head; | |
640 | else | |
641 | bl->head = bl2->head; | |
642 | ||
643 | bl->tail = bl2->tail; | |
644 | } | |
645 | ||
646 | static inline void bio_list_merge_head(struct bio_list *bl, | |
647 | struct bio_list *bl2) | |
648 | { | |
649 | if (!bl2->head) | |
650 | return; | |
651 | ||
652 | if (bl->head) | |
653 | bl2->tail->bi_next = bl->head; | |
654 | else | |
655 | bl->tail = bl2->tail; | |
656 | ||
657 | bl->head = bl2->head; | |
658 | } | |
659 | ||
13685a16 GU |
660 | static inline struct bio *bio_list_peek(struct bio_list *bl) |
661 | { | |
662 | return bl->head; | |
663 | } | |
664 | ||
8f3d8ba2 CH |
665 | static inline struct bio *bio_list_pop(struct bio_list *bl) |
666 | { | |
667 | struct bio *bio = bl->head; | |
668 | ||
669 | if (bio) { | |
670 | bl->head = bl->head->bi_next; | |
671 | if (!bl->head) | |
672 | bl->tail = NULL; | |
673 | ||
674 | bio->bi_next = NULL; | |
675 | } | |
676 | ||
677 | return bio; | |
678 | } | |
679 | ||
680 | static inline struct bio *bio_list_get(struct bio_list *bl) | |
681 | { | |
682 | struct bio *bio = bl->head; | |
683 | ||
684 | bl->head = bl->tail = NULL; | |
685 | ||
686 | return bio; | |
687 | } | |
688 | ||
0ef5a50c MS |
689 | /* |
690 | * Increment chain count for the bio. Make sure the CHAIN flag update | |
691 | * is visible before the raised count. | |
692 | */ | |
693 | static inline void bio_inc_remaining(struct bio *bio) | |
694 | { | |
695 | bio_set_flag(bio, BIO_CHAIN); | |
696 | smp_mb__before_atomic(); | |
697 | atomic_inc(&bio->__bi_remaining); | |
698 | } | |
699 | ||
57fb233f KO |
700 | /* |
701 | * bio_set is used to allow other portions of the IO system to | |
702 | * allocate their own private memory pools for bio and iovec structures. | |
703 | * These memory pools in turn all allocate from the bio_slab | |
704 | * and the bvec_slabs[]. | |
705 | */ | |
706 | #define BIO_POOL_SIZE 2 | |
57fb233f KO |
707 | |
708 | struct bio_set { | |
709 | struct kmem_cache *bio_slab; | |
710 | unsigned int front_pad; | |
711 | ||
712 | mempool_t *bio_pool; | |
9f060e22 | 713 | mempool_t *bvec_pool; |
57fb233f KO |
714 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
715 | mempool_t *bio_integrity_pool; | |
9f060e22 | 716 | mempool_t *bvec_integrity_pool; |
57fb233f | 717 | #endif |
df2cb6da KO |
718 | |
719 | /* | |
720 | * Deadlock avoidance for stacking block drivers: see comments in | |
721 | * bio_alloc_bioset() for details | |
722 | */ | |
723 | spinlock_t rescue_lock; | |
724 | struct bio_list rescue_list; | |
725 | struct work_struct rescue_work; | |
726 | struct workqueue_struct *rescue_workqueue; | |
57fb233f KO |
727 | }; |
728 | ||
729 | struct biovec_slab { | |
730 | int nr_vecs; | |
731 | char *name; | |
732 | struct kmem_cache *slab; | |
733 | }; | |
734 | ||
735 | /* | |
736 | * a small number of entries is fine, not going to be performance critical. | |
737 | * basically we just need to survive | |
738 | */ | |
739 | #define BIO_SPLIT_ENTRIES 2 | |
740 | ||
7ba1ba12 MP |
741 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
742 | ||
d57a5f7c KO |
743 | #define bip_for_each_vec(bvl, bip, iter) \ |
744 | for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter) | |
7ba1ba12 | 745 | |
13f05c8d MP |
746 | #define bio_for_each_integrity_vec(_bvl, _bio, _iter) \ |
747 | for_each_bio(_bio) \ | |
748 | bip_for_each_vec(_bvl, _bio->bi_integrity, _iter) | |
749 | ||
7ba1ba12 | 750 | extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int); |
7ba1ba12 | 751 | extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int); |
e23947bd | 752 | extern bool bio_integrity_prep(struct bio *); |
7ba1ba12 | 753 | extern void bio_integrity_advance(struct bio *, unsigned int); |
fbd08e76 | 754 | extern void bio_integrity_trim(struct bio *); |
1e2a410f | 755 | extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t); |
7878cba9 MP |
756 | extern int bioset_integrity_create(struct bio_set *, int); |
757 | extern void bioset_integrity_free(struct bio_set *); | |
758 | extern void bio_integrity_init(void); | |
7ba1ba12 MP |
759 | |
760 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
761 | ||
c611529e | 762 | static inline void *bio_integrity(struct bio *bio) |
6898e3bd | 763 | { |
c611529e | 764 | return NULL; |
6898e3bd MP |
765 | } |
766 | ||
6898e3bd MP |
767 | static inline int bioset_integrity_create(struct bio_set *bs, int pool_size) |
768 | { | |
769 | return 0; | |
770 | } | |
771 | ||
772 | static inline void bioset_integrity_free (struct bio_set *bs) | |
773 | { | |
774 | return; | |
775 | } | |
776 | ||
e23947bd | 777 | static inline bool bio_integrity_prep(struct bio *bio) |
6898e3bd | 778 | { |
e23947bd | 779 | return true; |
6898e3bd MP |
780 | } |
781 | ||
0c614e2d | 782 | static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
1e2a410f | 783 | gfp_t gfp_mask) |
0c614e2d SR |
784 | { |
785 | return 0; | |
786 | } | |
6898e3bd | 787 | |
6898e3bd MP |
788 | static inline void bio_integrity_advance(struct bio *bio, |
789 | unsigned int bytes_done) | |
790 | { | |
791 | return; | |
792 | } | |
793 | ||
fbd08e76 | 794 | static inline void bio_integrity_trim(struct bio *bio) |
6898e3bd MP |
795 | { |
796 | return; | |
797 | } | |
798 | ||
799 | static inline void bio_integrity_init(void) | |
800 | { | |
801 | return; | |
802 | } | |
7ba1ba12 | 803 | |
c611529e MP |
804 | static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag) |
805 | { | |
806 | return false; | |
807 | } | |
808 | ||
06c1e390 KB |
809 | static inline void *bio_integrity_alloc(struct bio * bio, gfp_t gfp, |
810 | unsigned int nr) | |
811 | { | |
812 | return ERR_PTR(-EINVAL); | |
813 | } | |
814 | ||
815 | static inline int bio_integrity_add_page(struct bio *bio, struct page *page, | |
816 | unsigned int len, unsigned int offset) | |
817 | { | |
818 | return 0; | |
819 | } | |
820 | ||
7ba1ba12 MP |
821 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
822 | ||
02a5e0ac | 823 | #endif /* CONFIG_BLOCK */ |
1da177e4 | 824 | #endif /* __LINUX_BIO_H */ |