Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * 2.5 block I/O model | |
3 | * | |
4 | * Copyright (C) 2001 Jens Axboe <axboe@suse.de> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
7cc01581 | 12 | * |
1da177e4 LT |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public Licens | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111- | |
19 | */ | |
20 | #ifndef __LINUX_BIO_H | |
21 | #define __LINUX_BIO_H | |
22 | ||
23 | #include <linux/highmem.h> | |
24 | #include <linux/mempool.h> | |
22e2c507 | 25 | #include <linux/ioprio.h> |
187f1882 | 26 | #include <linux/bug.h> |
1da177e4 | 27 | |
02a5e0ac DH |
28 | #ifdef CONFIG_BLOCK |
29 | ||
1da177e4 LT |
30 | #include <asm/io.h> |
31 | ||
7cc01581 TH |
32 | /* struct bio, bio_vec and BIO_* flags are defined in blk_types.h */ |
33 | #include <linux/blk_types.h> | |
34 | ||
1da177e4 LT |
35 | #define BIO_DEBUG |
36 | ||
37 | #ifdef BIO_DEBUG | |
38 | #define BIO_BUG_ON BUG_ON | |
39 | #else | |
40 | #define BIO_BUG_ON | |
41 | #endif | |
42 | ||
d84a8477 | 43 | #define BIO_MAX_PAGES 256 |
09cbfeaf | 44 | #define BIO_MAX_SIZE (BIO_MAX_PAGES << PAGE_SHIFT) |
1da177e4 LT |
45 | #define BIO_MAX_SECTORS (BIO_MAX_SIZE >> 9) |
46 | ||
43b62ce3 MC |
47 | #define bio_prio(bio) (bio)->bi_ioprio |
48 | #define bio_set_prio(bio, prio) ((bio)->bi_ioprio = prio) | |
22e2c507 | 49 | |
1da177e4 LT |
50 | /* |
51 | * various member access, note that bio_data should of course not be used | |
52 | * on highmem page vectors | |
53 | */ | |
4550dd6c | 54 | #define __bvec_iter_bvec(bvec, iter) (&(bvec)[(iter).bi_idx]) |
a4ad39b1 | 55 | |
4550dd6c KO |
56 | #define bvec_iter_page(bvec, iter) \ |
57 | (__bvec_iter_bvec((bvec), (iter))->bv_page) | |
58 | ||
59 | #define bvec_iter_len(bvec, iter) \ | |
60 | min((iter).bi_size, \ | |
61 | __bvec_iter_bvec((bvec), (iter))->bv_len - (iter).bi_bvec_done) | |
62 | ||
63 | #define bvec_iter_offset(bvec, iter) \ | |
64 | (__bvec_iter_bvec((bvec), (iter))->bv_offset + (iter).bi_bvec_done) | |
65 | ||
66 | #define bvec_iter_bvec(bvec, iter) \ | |
67 | ((struct bio_vec) { \ | |
68 | .bv_page = bvec_iter_page((bvec), (iter)), \ | |
69 | .bv_len = bvec_iter_len((bvec), (iter)), \ | |
70 | .bv_offset = bvec_iter_offset((bvec), (iter)), \ | |
71 | }) | |
72 | ||
73 | #define bio_iter_iovec(bio, iter) \ | |
74 | bvec_iter_bvec((bio)->bi_io_vec, (iter)) | |
75 | ||
76 | #define bio_iter_page(bio, iter) \ | |
77 | bvec_iter_page((bio)->bi_io_vec, (iter)) | |
78 | #define bio_iter_len(bio, iter) \ | |
79 | bvec_iter_len((bio)->bi_io_vec, (iter)) | |
80 | #define bio_iter_offset(bio, iter) \ | |
81 | bvec_iter_offset((bio)->bi_io_vec, (iter)) | |
82 | ||
83 | #define bio_page(bio) bio_iter_page((bio), (bio)->bi_iter) | |
84 | #define bio_offset(bio) bio_iter_offset((bio), (bio)->bi_iter) | |
85 | #define bio_iovec(bio) bio_iter_iovec((bio), (bio)->bi_iter) | |
7988613b | 86 | |
458b76ed KO |
87 | #define bio_multiple_segments(bio) \ |
88 | ((bio)->bi_iter.bi_size != bio_iovec(bio).bv_len) | |
4f024f37 KO |
89 | #define bio_sectors(bio) ((bio)->bi_iter.bi_size >> 9) |
90 | #define bio_end_sector(bio) ((bio)->bi_iter.bi_sector + bio_sectors((bio))) | |
bf2de6f5 | 91 | |
458b76ed KO |
92 | /* |
93 | * Check whether this bio carries any data or not. A NULL bio is allowed. | |
94 | */ | |
95 | static inline bool bio_has_data(struct bio *bio) | |
96 | { | |
97 | if (bio && | |
98 | bio->bi_iter.bi_size && | |
95fe6c1a | 99 | bio_op(bio) != REQ_OP_DISCARD) |
458b76ed KO |
100 | return true; |
101 | ||
102 | return false; | |
103 | } | |
104 | ||
95fe6c1a MC |
105 | static inline bool bio_no_advance_iter(struct bio *bio) |
106 | { | |
107 | return bio_op(bio) == REQ_OP_DISCARD || bio_op(bio) == REQ_OP_WRITE_SAME; | |
108 | } | |
109 | ||
458b76ed KO |
110 | static inline bool bio_is_rw(struct bio *bio) |
111 | { | |
112 | if (!bio_has_data(bio)) | |
113 | return false; | |
114 | ||
95fe6c1a | 115 | if (bio_no_advance_iter(bio)) |
458b76ed KO |
116 | return false; |
117 | ||
118 | return true; | |
119 | } | |
120 | ||
121 | static inline bool bio_mergeable(struct bio *bio) | |
122 | { | |
123 | if (bio->bi_rw & REQ_NOMERGE_FLAGS) | |
124 | return false; | |
125 | ||
126 | return true; | |
127 | } | |
128 | ||
2e46e8b2 | 129 | static inline unsigned int bio_cur_bytes(struct bio *bio) |
bf2de6f5 | 130 | { |
458b76ed | 131 | if (bio_has_data(bio)) |
a4ad39b1 | 132 | return bio_iovec(bio).bv_len; |
fb2dce86 | 133 | else /* dataless requests such as discard */ |
4f024f37 | 134 | return bio->bi_iter.bi_size; |
bf2de6f5 JA |
135 | } |
136 | ||
137 | static inline void *bio_data(struct bio *bio) | |
138 | { | |
458b76ed | 139 | if (bio_has_data(bio)) |
bf2de6f5 JA |
140 | return page_address(bio_page(bio)) + bio_offset(bio); |
141 | ||
142 | return NULL; | |
143 | } | |
1da177e4 LT |
144 | |
145 | /* | |
146 | * will die | |
147 | */ | |
148 | #define bio_to_phys(bio) (page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio))) | |
149 | #define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset) | |
150 | ||
151 | /* | |
152 | * queues that have highmem support enabled may still need to revert to | |
153 | * PIO transfers occasionally and thus map high pages temporarily. For | |
154 | * permanent PIO fall back, user is probably better off disabling highmem | |
155 | * I/O completely on that queue (see ide-dma for example) | |
156 | */ | |
f619d254 KO |
157 | #define __bio_kmap_atomic(bio, iter) \ |
158 | (kmap_atomic(bio_iter_iovec((bio), (iter)).bv_page) + \ | |
159 | bio_iter_iovec((bio), (iter)).bv_offset) | |
1da177e4 | 160 | |
f619d254 | 161 | #define __bio_kunmap_atomic(addr) kunmap_atomic(addr) |
1da177e4 LT |
162 | |
163 | /* | |
164 | * merge helpers etc | |
165 | */ | |
166 | ||
f92131c3 JF |
167 | /* Default implementation of BIOVEC_PHYS_MERGEABLE */ |
168 | #define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ | |
169 | ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2))) | |
170 | ||
1da177e4 LT |
171 | /* |
172 | * allow arch override, for eg virtualized architectures (put in asm/io.h) | |
173 | */ | |
174 | #ifndef BIOVEC_PHYS_MERGEABLE | |
175 | #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ | |
f92131c3 | 176 | __BIOVEC_PHYS_MERGEABLE(vec1, vec2) |
1da177e4 LT |
177 | #endif |
178 | ||
1da177e4 LT |
179 | #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \ |
180 | (((addr1) | (mask)) == (((addr2) - 1) | (mask))) | |
181 | #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \ | |
ae03bf63 | 182 | __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q))) |
1da177e4 | 183 | |
d74c6d51 KO |
184 | /* |
185 | * drivers should _never_ use the all version - the bio may have been split | |
186 | * before it got to the driver and the driver won't own all of it | |
187 | */ | |
188 | #define bio_for_each_segment_all(bvl, bio, i) \ | |
f619d254 | 189 | for (i = 0, bvl = (bio)->bi_io_vec; i < (bio)->bi_vcnt; i++, bvl++) |
d74c6d51 | 190 | |
4550dd6c KO |
191 | static inline void bvec_iter_advance(struct bio_vec *bv, struct bvec_iter *iter, |
192 | unsigned bytes) | |
193 | { | |
194 | WARN_ONCE(bytes > iter->bi_size, | |
195 | "Attempted to advance past end of bvec iter\n"); | |
196 | ||
197 | while (bytes) { | |
198 | unsigned len = min(bytes, bvec_iter_len(bv, *iter)); | |
199 | ||
200 | bytes -= len; | |
201 | iter->bi_size -= len; | |
202 | iter->bi_bvec_done += len; | |
203 | ||
204 | if (iter->bi_bvec_done == __bvec_iter_bvec(bv, *iter)->bv_len) { | |
205 | iter->bi_bvec_done = 0; | |
206 | iter->bi_idx++; | |
207 | } | |
208 | } | |
209 | } | |
210 | ||
211 | #define for_each_bvec(bvl, bio_vec, iter, start) \ | |
b7aa84d9 MP |
212 | for (iter = (start); \ |
213 | (iter).bi_size && \ | |
214 | ((bvl = bvec_iter_bvec((bio_vec), (iter))), 1); \ | |
4550dd6c KO |
215 | bvec_iter_advance((bio_vec), &(iter), (bvl).bv_len)) |
216 | ||
217 | ||
218 | static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter, | |
219 | unsigned bytes) | |
220 | { | |
221 | iter->bi_sector += bytes >> 9; | |
222 | ||
95fe6c1a | 223 | if (bio_no_advance_iter(bio)) |
4550dd6c KO |
224 | iter->bi_size -= bytes; |
225 | else | |
226 | bvec_iter_advance(bio->bi_io_vec, iter, bytes); | |
227 | } | |
228 | ||
7988613b KO |
229 | #define __bio_for_each_segment(bvl, bio, iter, start) \ |
230 | for (iter = (start); \ | |
4550dd6c KO |
231 | (iter).bi_size && \ |
232 | ((bvl = bio_iter_iovec((bio), (iter))), 1); \ | |
233 | bio_advance_iter((bio), &(iter), (bvl).bv_len)) | |
7988613b KO |
234 | |
235 | #define bio_for_each_segment(bvl, bio, iter) \ | |
236 | __bio_for_each_segment(bvl, bio, iter, (bio)->bi_iter) | |
237 | ||
4550dd6c | 238 | #define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len) |
1da177e4 | 239 | |
458b76ed KO |
240 | static inline unsigned bio_segments(struct bio *bio) |
241 | { | |
242 | unsigned segs = 0; | |
243 | struct bio_vec bv; | |
244 | struct bvec_iter iter; | |
245 | ||
8423ae3d KO |
246 | /* |
247 | * We special case discard/write same, because they interpret bi_size | |
248 | * differently: | |
249 | */ | |
250 | ||
95fe6c1a | 251 | if (bio_op(bio) == REQ_OP_DISCARD) |
8423ae3d KO |
252 | return 1; |
253 | ||
95fe6c1a | 254 | if (bio_op(bio) == REQ_OP_WRITE_SAME) |
8423ae3d KO |
255 | return 1; |
256 | ||
458b76ed KO |
257 | bio_for_each_segment(bv, bio, iter) |
258 | segs++; | |
259 | ||
260 | return segs; | |
261 | } | |
262 | ||
1da177e4 LT |
263 | /* |
264 | * get a reference to a bio, so it won't disappear. the intended use is | |
265 | * something like: | |
266 | * | |
267 | * bio_get(bio); | |
268 | * submit_bio(rw, bio); | |
269 | * if (bio->bi_flags ...) | |
270 | * do_something | |
271 | * bio_put(bio); | |
272 | * | |
273 | * without the bio_get(), it could potentially complete I/O before submit_bio | |
274 | * returns. and then bio would be freed memory when if (bio->bi_flags ...) | |
275 | * runs | |
276 | */ | |
dac56212 JA |
277 | static inline void bio_get(struct bio *bio) |
278 | { | |
279 | bio->bi_flags |= (1 << BIO_REFFED); | |
280 | smp_mb__before_atomic(); | |
281 | atomic_inc(&bio->__bi_cnt); | |
282 | } | |
283 | ||
284 | static inline void bio_cnt_set(struct bio *bio, unsigned int count) | |
285 | { | |
286 | if (count != 1) { | |
287 | bio->bi_flags |= (1 << BIO_REFFED); | |
288 | smp_mb__before_atomic(); | |
289 | } | |
290 | atomic_set(&bio->__bi_cnt, count); | |
291 | } | |
1da177e4 | 292 | |
b7c44ed9 JA |
293 | static inline bool bio_flagged(struct bio *bio, unsigned int bit) |
294 | { | |
2c68f6dc | 295 | return (bio->bi_flags & (1U << bit)) != 0; |
b7c44ed9 JA |
296 | } |
297 | ||
298 | static inline void bio_set_flag(struct bio *bio, unsigned int bit) | |
299 | { | |
2c68f6dc | 300 | bio->bi_flags |= (1U << bit); |
b7c44ed9 JA |
301 | } |
302 | ||
303 | static inline void bio_clear_flag(struct bio *bio, unsigned int bit) | |
304 | { | |
2c68f6dc | 305 | bio->bi_flags &= ~(1U << bit); |
b7c44ed9 JA |
306 | } |
307 | ||
7bcd79ac ML |
308 | static inline void bio_get_first_bvec(struct bio *bio, struct bio_vec *bv) |
309 | { | |
310 | *bv = bio_iovec(bio); | |
311 | } | |
312 | ||
313 | static inline void bio_get_last_bvec(struct bio *bio, struct bio_vec *bv) | |
314 | { | |
315 | struct bvec_iter iter = bio->bi_iter; | |
316 | int idx; | |
317 | ||
7bcd79ac ML |
318 | if (unlikely(!bio_multiple_segments(bio))) { |
319 | *bv = bio_iovec(bio); | |
320 | return; | |
321 | } | |
322 | ||
323 | bio_advance_iter(bio, &iter, iter.bi_size); | |
324 | ||
325 | if (!iter.bi_bvec_done) | |
326 | idx = iter.bi_idx - 1; | |
327 | else /* in the middle of bvec */ | |
328 | idx = iter.bi_idx; | |
329 | ||
330 | *bv = bio->bi_io_vec[idx]; | |
331 | ||
332 | /* | |
333 | * iter.bi_bvec_done records actual length of the last bvec | |
334 | * if this bio ends in the middle of one io vector | |
335 | */ | |
336 | if (iter.bi_bvec_done) | |
337 | bv->bv_len = iter.bi_bvec_done; | |
338 | } | |
339 | ||
c611529e MP |
340 | enum bip_flags { |
341 | BIP_BLOCK_INTEGRITY = 1 << 0, /* block layer owns integrity data */ | |
342 | BIP_MAPPED_INTEGRITY = 1 << 1, /* ref tag has been remapped */ | |
343 | BIP_CTRL_NOCHECK = 1 << 2, /* disable HBA integrity checking */ | |
344 | BIP_DISK_NOCHECK = 1 << 3, /* disable disk integrity checking */ | |
345 | BIP_IP_CHECKSUM = 1 << 4, /* IP checksum */ | |
346 | }; | |
347 | ||
7ba1ba12 MP |
348 | /* |
349 | * bio integrity payload | |
350 | */ | |
351 | struct bio_integrity_payload { | |
352 | struct bio *bip_bio; /* parent bio */ | |
7ba1ba12 | 353 | |
d57a5f7c | 354 | struct bvec_iter bip_iter; |
7ba1ba12 | 355 | |
d57a5f7c | 356 | bio_end_io_t *bip_end_io; /* saved I/O completion fn */ |
7ba1ba12 | 357 | |
7878cba9 | 358 | unsigned short bip_slab; /* slab the bip came from */ |
7ba1ba12 | 359 | unsigned short bip_vcnt; /* # of integrity bio_vecs */ |
cbcd1054 | 360 | unsigned short bip_max_vcnt; /* integrity bio_vec slots */ |
b1f01388 | 361 | unsigned short bip_flags; /* control flags */ |
7ba1ba12 MP |
362 | |
363 | struct work_struct bip_work; /* I/O completion */ | |
6fda981c KO |
364 | |
365 | struct bio_vec *bip_vec; | |
366 | struct bio_vec bip_inline_vecs[0];/* embedded bvec array */ | |
7ba1ba12 | 367 | }; |
18593088 | 368 | |
06c1e390 KB |
369 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
370 | ||
371 | static inline struct bio_integrity_payload *bio_integrity(struct bio *bio) | |
372 | { | |
373 | if (bio->bi_rw & REQ_INTEGRITY) | |
374 | return bio->bi_integrity; | |
375 | ||
376 | return NULL; | |
377 | } | |
378 | ||
c611529e MP |
379 | static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag) |
380 | { | |
381 | struct bio_integrity_payload *bip = bio_integrity(bio); | |
382 | ||
383 | if (bip) | |
384 | return bip->bip_flags & flag; | |
385 | ||
386 | return false; | |
387 | } | |
b1f01388 | 388 | |
18593088 MP |
389 | static inline sector_t bip_get_seed(struct bio_integrity_payload *bip) |
390 | { | |
391 | return bip->bip_iter.bi_sector; | |
392 | } | |
393 | ||
394 | static inline void bip_set_seed(struct bio_integrity_payload *bip, | |
395 | sector_t seed) | |
396 | { | |
397 | bip->bip_iter.bi_sector = seed; | |
398 | } | |
399 | ||
7ba1ba12 | 400 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
1da177e4 | 401 | |
6678d83f | 402 | extern void bio_trim(struct bio *bio, int offset, int size); |
20d0189b KO |
403 | extern struct bio *bio_split(struct bio *bio, int sectors, |
404 | gfp_t gfp, struct bio_set *bs); | |
405 | ||
406 | /** | |
407 | * bio_next_split - get next @sectors from a bio, splitting if necessary | |
408 | * @bio: bio to split | |
409 | * @sectors: number of sectors to split from the front of @bio | |
410 | * @gfp: gfp mask | |
411 | * @bs: bio set to allocate from | |
412 | * | |
413 | * Returns a bio representing the next @sectors of @bio - if the bio is smaller | |
414 | * than @sectors, returns the original bio unchanged. | |
415 | */ | |
416 | static inline struct bio *bio_next_split(struct bio *bio, int sectors, | |
417 | gfp_t gfp, struct bio_set *bs) | |
418 | { | |
419 | if (sectors >= bio_sectors(bio)) | |
420 | return bio; | |
421 | ||
422 | return bio_split(bio, sectors, gfp, bs); | |
423 | } | |
424 | ||
bb799ca0 | 425 | extern struct bio_set *bioset_create(unsigned int, unsigned int); |
d8f429e1 | 426 | extern struct bio_set *bioset_create_nobvec(unsigned int, unsigned int); |
1da177e4 | 427 | extern void bioset_free(struct bio_set *); |
a6c39cb4 | 428 | extern mempool_t *biovec_create_pool(int pool_entries); |
1da177e4 | 429 | |
dd0fc66f | 430 | extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *); |
1da177e4 LT |
431 | extern void bio_put(struct bio *); |
432 | ||
59d276fe KO |
433 | extern void __bio_clone_fast(struct bio *, struct bio *); |
434 | extern struct bio *bio_clone_fast(struct bio *, gfp_t, struct bio_set *); | |
bf800ef1 KO |
435 | extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs); |
436 | ||
3f86a82a KO |
437 | extern struct bio_set *fs_bio_set; |
438 | ||
439 | static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) | |
440 | { | |
441 | return bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set); | |
442 | } | |
443 | ||
bf800ef1 KO |
444 | static inline struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask) |
445 | { | |
446 | return bio_clone_bioset(bio, gfp_mask, fs_bio_set); | |
447 | } | |
448 | ||
3f86a82a KO |
449 | static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs) |
450 | { | |
451 | return bio_alloc_bioset(gfp_mask, nr_iovecs, NULL); | |
452 | } | |
453 | ||
bf800ef1 KO |
454 | static inline struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask) |
455 | { | |
456 | return bio_clone_bioset(bio, gfp_mask, NULL); | |
457 | ||
458 | } | |
459 | ||
4246a0b6 CH |
460 | extern void bio_endio(struct bio *); |
461 | ||
462 | static inline void bio_io_error(struct bio *bio) | |
463 | { | |
464 | bio->bi_error = -EIO; | |
465 | bio_endio(bio); | |
466 | } | |
467 | ||
1da177e4 LT |
468 | struct request_queue; |
469 | extern int bio_phys_segments(struct request_queue *, struct bio *); | |
1da177e4 | 470 | |
4e49ea4a | 471 | extern int submit_bio_wait(struct bio *bio); |
054bdf64 KO |
472 | extern void bio_advance(struct bio *, unsigned); |
473 | ||
1da177e4 | 474 | extern void bio_init(struct bio *); |
f44b48c7 | 475 | extern void bio_reset(struct bio *); |
196d38bc | 476 | void bio_chain(struct bio *, struct bio *); |
1da177e4 LT |
477 | |
478 | extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int); | |
6e68af66 MC |
479 | extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *, |
480 | unsigned int, unsigned int); | |
152e283f | 481 | struct rq_map_data; |
f1970baf | 482 | extern struct bio *bio_map_user_iov(struct request_queue *, |
26e49cfc | 483 | const struct iov_iter *, gfp_t); |
1da177e4 | 484 | extern void bio_unmap_user(struct bio *); |
df46b9a4 | 485 | extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int, |
27496a8c | 486 | gfp_t); |
68154e90 FT |
487 | extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int, |
488 | gfp_t, int); | |
1da177e4 LT |
489 | extern void bio_set_pages_dirty(struct bio *bio); |
490 | extern void bio_check_pages_dirty(struct bio *bio); | |
2d4dc890 | 491 | |
394ffa50 GZ |
492 | void generic_start_io_acct(int rw, unsigned long sectors, |
493 | struct hd_struct *part); | |
494 | void generic_end_io_acct(int rw, struct hd_struct *part, | |
495 | unsigned long start_time); | |
496 | ||
2d4dc890 IL |
497 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
498 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
499 | #endif | |
500 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
501 | extern void bio_flush_dcache_pages(struct bio *bi); | |
502 | #else | |
503 | static inline void bio_flush_dcache_pages(struct bio *bi) | |
504 | { | |
505 | } | |
506 | #endif | |
507 | ||
16ac3d63 | 508 | extern void bio_copy_data(struct bio *dst, struct bio *src); |
a0787606 | 509 | extern int bio_alloc_pages(struct bio *bio, gfp_t gfp); |
16ac3d63 | 510 | |
152e283f | 511 | extern struct bio *bio_copy_user_iov(struct request_queue *, |
86d564c8 | 512 | struct rq_map_data *, |
26e49cfc KO |
513 | const struct iov_iter *, |
514 | gfp_t); | |
1da177e4 LT |
515 | extern int bio_uncopy_user(struct bio *); |
516 | void zero_fill_bio(struct bio *bio); | |
9f060e22 KO |
517 | extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *); |
518 | extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int); | |
7ba1ba12 | 519 | extern unsigned int bvec_nr_vecs(unsigned short idx); |
51d654e1 | 520 | |
852c788f | 521 | #ifdef CONFIG_BLK_CGROUP |
1d933cf0 | 522 | int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css); |
852c788f TH |
523 | int bio_associate_current(struct bio *bio); |
524 | void bio_disassociate_task(struct bio *bio); | |
525 | #else /* CONFIG_BLK_CGROUP */ | |
1d933cf0 TH |
526 | static inline int bio_associate_blkcg(struct bio *bio, |
527 | struct cgroup_subsys_state *blkcg_css) { return 0; } | |
852c788f TH |
528 | static inline int bio_associate_current(struct bio *bio) { return -ENOENT; } |
529 | static inline void bio_disassociate_task(struct bio *bio) { } | |
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 | ||
f619d254 | 573 | static inline char *__bio_kmap_irq(struct bio *bio, struct bvec_iter iter, |
1da177e4 LT |
574 | unsigned long *flags) |
575 | { | |
f619d254 | 576 | return bvec_kmap_irq(&bio_iter_iovec(bio, iter), flags); |
1da177e4 LT |
577 | } |
578 | #define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags) | |
579 | ||
580 | #define bio_kmap_irq(bio, flags) \ | |
f619d254 | 581 | __bio_kmap_irq((bio), (bio)->bi_iter, (flags)) |
1da177e4 LT |
582 | #define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags) |
583 | ||
8f3d8ba2 | 584 | /* |
e686307f | 585 | * BIO list management for use by remapping drivers (e.g. DM or MD) and loop. |
8f3d8ba2 CH |
586 | * |
587 | * A bio_list anchors a singly-linked list of bios chained through the bi_next | |
588 | * member of the bio. The bio_list also caches the last list member to allow | |
589 | * fast access to the tail. | |
590 | */ | |
591 | struct bio_list { | |
592 | struct bio *head; | |
593 | struct bio *tail; | |
594 | }; | |
595 | ||
596 | static inline int bio_list_empty(const struct bio_list *bl) | |
597 | { | |
598 | return bl->head == NULL; | |
599 | } | |
600 | ||
601 | static inline void bio_list_init(struct bio_list *bl) | |
602 | { | |
603 | bl->head = bl->tail = NULL; | |
604 | } | |
605 | ||
320ae51f JA |
606 | #define BIO_EMPTY_LIST { NULL, NULL } |
607 | ||
8f3d8ba2 CH |
608 | #define bio_list_for_each(bio, bl) \ |
609 | for (bio = (bl)->head; bio; bio = bio->bi_next) | |
610 | ||
611 | static inline unsigned bio_list_size(const struct bio_list *bl) | |
612 | { | |
613 | unsigned sz = 0; | |
614 | struct bio *bio; | |
615 | ||
616 | bio_list_for_each(bio, bl) | |
617 | sz++; | |
618 | ||
619 | return sz; | |
620 | } | |
621 | ||
622 | static inline void bio_list_add(struct bio_list *bl, struct bio *bio) | |
623 | { | |
624 | bio->bi_next = NULL; | |
625 | ||
626 | if (bl->tail) | |
627 | bl->tail->bi_next = bio; | |
628 | else | |
629 | bl->head = bio; | |
630 | ||
631 | bl->tail = bio; | |
632 | } | |
633 | ||
634 | static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio) | |
635 | { | |
636 | bio->bi_next = bl->head; | |
637 | ||
638 | bl->head = bio; | |
639 | ||
640 | if (!bl->tail) | |
641 | bl->tail = bio; | |
642 | } | |
643 | ||
644 | static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2) | |
645 | { | |
646 | if (!bl2->head) | |
647 | return; | |
648 | ||
649 | if (bl->tail) | |
650 | bl->tail->bi_next = bl2->head; | |
651 | else | |
652 | bl->head = bl2->head; | |
653 | ||
654 | bl->tail = bl2->tail; | |
655 | } | |
656 | ||
657 | static inline void bio_list_merge_head(struct bio_list *bl, | |
658 | struct bio_list *bl2) | |
659 | { | |
660 | if (!bl2->head) | |
661 | return; | |
662 | ||
663 | if (bl->head) | |
664 | bl2->tail->bi_next = bl->head; | |
665 | else | |
666 | bl->tail = bl2->tail; | |
667 | ||
668 | bl->head = bl2->head; | |
669 | } | |
670 | ||
13685a16 GU |
671 | static inline struct bio *bio_list_peek(struct bio_list *bl) |
672 | { | |
673 | return bl->head; | |
674 | } | |
675 | ||
8f3d8ba2 CH |
676 | static inline struct bio *bio_list_pop(struct bio_list *bl) |
677 | { | |
678 | struct bio *bio = bl->head; | |
679 | ||
680 | if (bio) { | |
681 | bl->head = bl->head->bi_next; | |
682 | if (!bl->head) | |
683 | bl->tail = NULL; | |
684 | ||
685 | bio->bi_next = NULL; | |
686 | } | |
687 | ||
688 | return bio; | |
689 | } | |
690 | ||
691 | static inline struct bio *bio_list_get(struct bio_list *bl) | |
692 | { | |
693 | struct bio *bio = bl->head; | |
694 | ||
695 | bl->head = bl->tail = NULL; | |
696 | ||
697 | return bio; | |
698 | } | |
699 | ||
0ef5a50c MS |
700 | /* |
701 | * Increment chain count for the bio. Make sure the CHAIN flag update | |
702 | * is visible before the raised count. | |
703 | */ | |
704 | static inline void bio_inc_remaining(struct bio *bio) | |
705 | { | |
706 | bio_set_flag(bio, BIO_CHAIN); | |
707 | smp_mb__before_atomic(); | |
708 | atomic_inc(&bio->__bi_remaining); | |
709 | } | |
710 | ||
57fb233f KO |
711 | /* |
712 | * bio_set is used to allow other portions of the IO system to | |
713 | * allocate their own private memory pools for bio and iovec structures. | |
714 | * These memory pools in turn all allocate from the bio_slab | |
715 | * and the bvec_slabs[]. | |
716 | */ | |
717 | #define BIO_POOL_SIZE 2 | |
718 | #define BIOVEC_NR_POOLS 6 | |
719 | #define BIOVEC_MAX_IDX (BIOVEC_NR_POOLS - 1) | |
720 | ||
721 | struct bio_set { | |
722 | struct kmem_cache *bio_slab; | |
723 | unsigned int front_pad; | |
724 | ||
725 | mempool_t *bio_pool; | |
9f060e22 | 726 | mempool_t *bvec_pool; |
57fb233f KO |
727 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
728 | mempool_t *bio_integrity_pool; | |
9f060e22 | 729 | mempool_t *bvec_integrity_pool; |
57fb233f | 730 | #endif |
df2cb6da KO |
731 | |
732 | /* | |
733 | * Deadlock avoidance for stacking block drivers: see comments in | |
734 | * bio_alloc_bioset() for details | |
735 | */ | |
736 | spinlock_t rescue_lock; | |
737 | struct bio_list rescue_list; | |
738 | struct work_struct rescue_work; | |
739 | struct workqueue_struct *rescue_workqueue; | |
57fb233f KO |
740 | }; |
741 | ||
742 | struct biovec_slab { | |
743 | int nr_vecs; | |
744 | char *name; | |
745 | struct kmem_cache *slab; | |
746 | }; | |
747 | ||
748 | /* | |
749 | * a small number of entries is fine, not going to be performance critical. | |
750 | * basically we just need to survive | |
751 | */ | |
752 | #define BIO_SPLIT_ENTRIES 2 | |
753 | ||
7ba1ba12 MP |
754 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
755 | ||
d57a5f7c KO |
756 | #define bip_for_each_vec(bvl, bip, iter) \ |
757 | for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter) | |
7ba1ba12 | 758 | |
13f05c8d MP |
759 | #define bio_for_each_integrity_vec(_bvl, _bio, _iter) \ |
760 | for_each_bio(_bio) \ | |
761 | bip_for_each_vec(_bvl, _bio->bi_integrity, _iter) | |
762 | ||
7ba1ba12 | 763 | extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int); |
1e2a410f | 764 | extern void bio_integrity_free(struct bio *); |
7ba1ba12 | 765 | extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int); |
e7258c1a | 766 | extern bool bio_integrity_enabled(struct bio *bio); |
7ba1ba12 | 767 | extern int bio_integrity_prep(struct bio *); |
4246a0b6 | 768 | extern void bio_integrity_endio(struct bio *); |
7ba1ba12 MP |
769 | extern void bio_integrity_advance(struct bio *, unsigned int); |
770 | extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int); | |
1e2a410f | 771 | extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t); |
7878cba9 MP |
772 | extern int bioset_integrity_create(struct bio_set *, int); |
773 | extern void bioset_integrity_free(struct bio_set *); | |
774 | extern void bio_integrity_init(void); | |
7ba1ba12 MP |
775 | |
776 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
777 | ||
c611529e | 778 | static inline void *bio_integrity(struct bio *bio) |
6898e3bd | 779 | { |
c611529e | 780 | return NULL; |
6898e3bd MP |
781 | } |
782 | ||
e7258c1a | 783 | static inline bool bio_integrity_enabled(struct bio *bio) |
6898e3bd | 784 | { |
e7258c1a | 785 | return false; |
6898e3bd MP |
786 | } |
787 | ||
788 | static inline int bioset_integrity_create(struct bio_set *bs, int pool_size) | |
789 | { | |
790 | return 0; | |
791 | } | |
792 | ||
793 | static inline void bioset_integrity_free (struct bio_set *bs) | |
794 | { | |
795 | return; | |
796 | } | |
797 | ||
798 | static inline int bio_integrity_prep(struct bio *bio) | |
799 | { | |
800 | return 0; | |
801 | } | |
802 | ||
1e2a410f | 803 | static inline void bio_integrity_free(struct bio *bio) |
6898e3bd MP |
804 | { |
805 | return; | |
806 | } | |
807 | ||
0c614e2d | 808 | static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
1e2a410f | 809 | gfp_t gfp_mask) |
0c614e2d SR |
810 | { |
811 | return 0; | |
812 | } | |
6898e3bd | 813 | |
6898e3bd MP |
814 | static inline void bio_integrity_advance(struct bio *bio, |
815 | unsigned int bytes_done) | |
816 | { | |
817 | return; | |
818 | } | |
819 | ||
820 | static inline void bio_integrity_trim(struct bio *bio, unsigned int offset, | |
821 | unsigned int sectors) | |
822 | { | |
823 | return; | |
824 | } | |
825 | ||
826 | static inline void bio_integrity_init(void) | |
827 | { | |
828 | return; | |
829 | } | |
7ba1ba12 | 830 | |
c611529e MP |
831 | static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag) |
832 | { | |
833 | return false; | |
834 | } | |
835 | ||
06c1e390 KB |
836 | static inline void *bio_integrity_alloc(struct bio * bio, gfp_t gfp, |
837 | unsigned int nr) | |
838 | { | |
839 | return ERR_PTR(-EINVAL); | |
840 | } | |
841 | ||
842 | static inline int bio_integrity_add_page(struct bio *bio, struct page *page, | |
843 | unsigned int len, unsigned int offset) | |
844 | { | |
845 | return 0; | |
846 | } | |
847 | ||
7ba1ba12 MP |
848 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
849 | ||
02a5e0ac | 850 | #endif /* CONFIG_BLOCK */ |
1da177e4 | 851 | #endif /* __LINUX_BIO_H */ |