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 |
1da177e4 | 44 | |
43b62ce3 MC |
45 | #define bio_prio(bio) (bio)->bi_ioprio |
46 | #define bio_set_prio(bio, prio) ((bio)->bi_ioprio = prio) | |
22e2c507 | 47 | |
4550dd6c KO |
48 | #define bio_iter_iovec(bio, iter) \ |
49 | bvec_iter_bvec((bio)->bi_io_vec, (iter)) | |
50 | ||
51 | #define bio_iter_page(bio, iter) \ | |
52 | bvec_iter_page((bio)->bi_io_vec, (iter)) | |
53 | #define bio_iter_len(bio, iter) \ | |
54 | bvec_iter_len((bio)->bi_io_vec, (iter)) | |
55 | #define bio_iter_offset(bio, iter) \ | |
56 | bvec_iter_offset((bio)->bi_io_vec, (iter)) | |
57 | ||
58 | #define bio_page(bio) bio_iter_page((bio), (bio)->bi_iter) | |
59 | #define bio_offset(bio) bio_iter_offset((bio), (bio)->bi_iter) | |
60 | #define bio_iovec(bio) bio_iter_iovec((bio), (bio)->bi_iter) | |
7988613b | 61 | |
458b76ed KO |
62 | #define bio_multiple_segments(bio) \ |
63 | ((bio)->bi_iter.bi_size != bio_iovec(bio).bv_len) | |
4f024f37 KO |
64 | #define bio_sectors(bio) ((bio)->bi_iter.bi_size >> 9) |
65 | #define bio_end_sector(bio) ((bio)->bi_iter.bi_sector + bio_sectors((bio))) | |
bf2de6f5 | 66 | |
458b76ed KO |
67 | /* |
68 | * Check whether this bio carries any data or not. A NULL bio is allowed. | |
69 | */ | |
70 | static inline bool bio_has_data(struct bio *bio) | |
71 | { | |
72 | if (bio && | |
73 | bio->bi_iter.bi_size && | |
95fe6c1a | 74 | bio_op(bio) != REQ_OP_DISCARD) |
458b76ed KO |
75 | return true; |
76 | ||
77 | return false; | |
78 | } | |
79 | ||
95fe6c1a MC |
80 | static inline bool bio_no_advance_iter(struct bio *bio) |
81 | { | |
82 | return bio_op(bio) == REQ_OP_DISCARD || bio_op(bio) == REQ_OP_WRITE_SAME; | |
83 | } | |
84 | ||
458b76ed KO |
85 | static inline bool bio_is_rw(struct bio *bio) |
86 | { | |
87 | if (!bio_has_data(bio)) | |
88 | return false; | |
89 | ||
95fe6c1a | 90 | if (bio_no_advance_iter(bio)) |
458b76ed KO |
91 | return false; |
92 | ||
93 | return true; | |
94 | } | |
95 | ||
96 | static inline bool bio_mergeable(struct bio *bio) | |
97 | { | |
98 | if (bio->bi_rw & REQ_NOMERGE_FLAGS) | |
99 | return false; | |
100 | ||
101 | return true; | |
102 | } | |
103 | ||
2e46e8b2 | 104 | static inline unsigned int bio_cur_bytes(struct bio *bio) |
bf2de6f5 | 105 | { |
458b76ed | 106 | if (bio_has_data(bio)) |
a4ad39b1 | 107 | return bio_iovec(bio).bv_len; |
fb2dce86 | 108 | else /* dataless requests such as discard */ |
4f024f37 | 109 | return bio->bi_iter.bi_size; |
bf2de6f5 JA |
110 | } |
111 | ||
112 | static inline void *bio_data(struct bio *bio) | |
113 | { | |
458b76ed | 114 | if (bio_has_data(bio)) |
bf2de6f5 JA |
115 | return page_address(bio_page(bio)) + bio_offset(bio); |
116 | ||
117 | return NULL; | |
118 | } | |
1da177e4 LT |
119 | |
120 | /* | |
121 | * will die | |
122 | */ | |
123 | #define bio_to_phys(bio) (page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio))) | |
124 | #define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset) | |
125 | ||
126 | /* | |
127 | * queues that have highmem support enabled may still need to revert to | |
128 | * PIO transfers occasionally and thus map high pages temporarily. For | |
129 | * permanent PIO fall back, user is probably better off disabling highmem | |
130 | * I/O completely on that queue (see ide-dma for example) | |
131 | */ | |
f619d254 KO |
132 | #define __bio_kmap_atomic(bio, iter) \ |
133 | (kmap_atomic(bio_iter_iovec((bio), (iter)).bv_page) + \ | |
134 | bio_iter_iovec((bio), (iter)).bv_offset) | |
1da177e4 | 135 | |
f619d254 | 136 | #define __bio_kunmap_atomic(addr) kunmap_atomic(addr) |
1da177e4 LT |
137 | |
138 | /* | |
139 | * merge helpers etc | |
140 | */ | |
141 | ||
f92131c3 JF |
142 | /* Default implementation of BIOVEC_PHYS_MERGEABLE */ |
143 | #define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ | |
144 | ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2))) | |
145 | ||
1da177e4 LT |
146 | /* |
147 | * allow arch override, for eg virtualized architectures (put in asm/io.h) | |
148 | */ | |
149 | #ifndef BIOVEC_PHYS_MERGEABLE | |
150 | #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ | |
f92131c3 | 151 | __BIOVEC_PHYS_MERGEABLE(vec1, vec2) |
1da177e4 LT |
152 | #endif |
153 | ||
1da177e4 LT |
154 | #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \ |
155 | (((addr1) | (mask)) == (((addr2) - 1) | (mask))) | |
156 | #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \ | |
ae03bf63 | 157 | __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q))) |
1da177e4 | 158 | |
d74c6d51 KO |
159 | /* |
160 | * drivers should _never_ use the all version - the bio may have been split | |
161 | * before it got to the driver and the driver won't own all of it | |
162 | */ | |
163 | #define bio_for_each_segment_all(bvl, bio, i) \ | |
f619d254 | 164 | for (i = 0, bvl = (bio)->bi_io_vec; i < (bio)->bi_vcnt; i++, bvl++) |
d74c6d51 | 165 | |
4550dd6c KO |
166 | static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter, |
167 | unsigned bytes) | |
168 | { | |
169 | iter->bi_sector += bytes >> 9; | |
170 | ||
95fe6c1a | 171 | if (bio_no_advance_iter(bio)) |
4550dd6c KO |
172 | iter->bi_size -= bytes; |
173 | else | |
174 | bvec_iter_advance(bio->bi_io_vec, iter, bytes); | |
175 | } | |
176 | ||
7988613b KO |
177 | #define __bio_for_each_segment(bvl, bio, iter, start) \ |
178 | for (iter = (start); \ | |
4550dd6c KO |
179 | (iter).bi_size && \ |
180 | ((bvl = bio_iter_iovec((bio), (iter))), 1); \ | |
181 | bio_advance_iter((bio), &(iter), (bvl).bv_len)) | |
7988613b KO |
182 | |
183 | #define bio_for_each_segment(bvl, bio, iter) \ | |
184 | __bio_for_each_segment(bvl, bio, iter, (bio)->bi_iter) | |
185 | ||
4550dd6c | 186 | #define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len) |
1da177e4 | 187 | |
458b76ed KO |
188 | static inline unsigned bio_segments(struct bio *bio) |
189 | { | |
190 | unsigned segs = 0; | |
191 | struct bio_vec bv; | |
192 | struct bvec_iter iter; | |
193 | ||
8423ae3d KO |
194 | /* |
195 | * We special case discard/write same, because they interpret bi_size | |
196 | * differently: | |
197 | */ | |
198 | ||
95fe6c1a | 199 | if (bio_op(bio) == REQ_OP_DISCARD) |
8423ae3d KO |
200 | return 1; |
201 | ||
95fe6c1a | 202 | if (bio_op(bio) == REQ_OP_WRITE_SAME) |
8423ae3d KO |
203 | return 1; |
204 | ||
458b76ed KO |
205 | bio_for_each_segment(bv, bio, iter) |
206 | segs++; | |
207 | ||
208 | return segs; | |
209 | } | |
210 | ||
1da177e4 LT |
211 | /* |
212 | * get a reference to a bio, so it won't disappear. the intended use is | |
213 | * something like: | |
214 | * | |
215 | * bio_get(bio); | |
216 | * submit_bio(rw, bio); | |
217 | * if (bio->bi_flags ...) | |
218 | * do_something | |
219 | * bio_put(bio); | |
220 | * | |
221 | * without the bio_get(), it could potentially complete I/O before submit_bio | |
222 | * returns. and then bio would be freed memory when if (bio->bi_flags ...) | |
223 | * runs | |
224 | */ | |
dac56212 JA |
225 | static inline void bio_get(struct bio *bio) |
226 | { | |
227 | bio->bi_flags |= (1 << BIO_REFFED); | |
228 | smp_mb__before_atomic(); | |
229 | atomic_inc(&bio->__bi_cnt); | |
230 | } | |
231 | ||
232 | static inline void bio_cnt_set(struct bio *bio, unsigned int count) | |
233 | { | |
234 | if (count != 1) { | |
235 | bio->bi_flags |= (1 << BIO_REFFED); | |
236 | smp_mb__before_atomic(); | |
237 | } | |
238 | atomic_set(&bio->__bi_cnt, count); | |
239 | } | |
1da177e4 | 240 | |
b7c44ed9 JA |
241 | static inline bool bio_flagged(struct bio *bio, unsigned int bit) |
242 | { | |
2c68f6dc | 243 | return (bio->bi_flags & (1U << bit)) != 0; |
b7c44ed9 JA |
244 | } |
245 | ||
246 | static inline void bio_set_flag(struct bio *bio, unsigned int bit) | |
247 | { | |
2c68f6dc | 248 | bio->bi_flags |= (1U << bit); |
b7c44ed9 JA |
249 | } |
250 | ||
251 | static inline void bio_clear_flag(struct bio *bio, unsigned int bit) | |
252 | { | |
2c68f6dc | 253 | bio->bi_flags &= ~(1U << bit); |
b7c44ed9 JA |
254 | } |
255 | ||
7bcd79ac ML |
256 | static inline void bio_get_first_bvec(struct bio *bio, struct bio_vec *bv) |
257 | { | |
258 | *bv = bio_iovec(bio); | |
259 | } | |
260 | ||
261 | static inline void bio_get_last_bvec(struct bio *bio, struct bio_vec *bv) | |
262 | { | |
263 | struct bvec_iter iter = bio->bi_iter; | |
264 | int idx; | |
265 | ||
7bcd79ac ML |
266 | if (unlikely(!bio_multiple_segments(bio))) { |
267 | *bv = bio_iovec(bio); | |
268 | return; | |
269 | } | |
270 | ||
271 | bio_advance_iter(bio, &iter, iter.bi_size); | |
272 | ||
273 | if (!iter.bi_bvec_done) | |
274 | idx = iter.bi_idx - 1; | |
275 | else /* in the middle of bvec */ | |
276 | idx = iter.bi_idx; | |
277 | ||
278 | *bv = bio->bi_io_vec[idx]; | |
279 | ||
280 | /* | |
281 | * iter.bi_bvec_done records actual length of the last bvec | |
282 | * if this bio ends in the middle of one io vector | |
283 | */ | |
284 | if (iter.bi_bvec_done) | |
285 | bv->bv_len = iter.bi_bvec_done; | |
286 | } | |
287 | ||
c611529e MP |
288 | enum bip_flags { |
289 | BIP_BLOCK_INTEGRITY = 1 << 0, /* block layer owns integrity data */ | |
290 | BIP_MAPPED_INTEGRITY = 1 << 1, /* ref tag has been remapped */ | |
291 | BIP_CTRL_NOCHECK = 1 << 2, /* disable HBA integrity checking */ | |
292 | BIP_DISK_NOCHECK = 1 << 3, /* disable disk integrity checking */ | |
293 | BIP_IP_CHECKSUM = 1 << 4, /* IP checksum */ | |
294 | }; | |
295 | ||
7ba1ba12 MP |
296 | /* |
297 | * bio integrity payload | |
298 | */ | |
299 | struct bio_integrity_payload { | |
300 | struct bio *bip_bio; /* parent bio */ | |
7ba1ba12 | 301 | |
d57a5f7c | 302 | struct bvec_iter bip_iter; |
7ba1ba12 | 303 | |
d57a5f7c | 304 | bio_end_io_t *bip_end_io; /* saved I/O completion fn */ |
7ba1ba12 | 305 | |
7878cba9 | 306 | unsigned short bip_slab; /* slab the bip came from */ |
7ba1ba12 | 307 | unsigned short bip_vcnt; /* # of integrity bio_vecs */ |
cbcd1054 | 308 | unsigned short bip_max_vcnt; /* integrity bio_vec slots */ |
b1f01388 | 309 | unsigned short bip_flags; /* control flags */ |
7ba1ba12 MP |
310 | |
311 | struct work_struct bip_work; /* I/O completion */ | |
6fda981c KO |
312 | |
313 | struct bio_vec *bip_vec; | |
314 | struct bio_vec bip_inline_vecs[0];/* embedded bvec array */ | |
7ba1ba12 | 315 | }; |
18593088 | 316 | |
06c1e390 KB |
317 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
318 | ||
319 | static inline struct bio_integrity_payload *bio_integrity(struct bio *bio) | |
320 | { | |
321 | if (bio->bi_rw & REQ_INTEGRITY) | |
322 | return bio->bi_integrity; | |
323 | ||
324 | return NULL; | |
325 | } | |
326 | ||
c611529e MP |
327 | static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag) |
328 | { | |
329 | struct bio_integrity_payload *bip = bio_integrity(bio); | |
330 | ||
331 | if (bip) | |
332 | return bip->bip_flags & flag; | |
333 | ||
334 | return false; | |
335 | } | |
b1f01388 | 336 | |
18593088 MP |
337 | static inline sector_t bip_get_seed(struct bio_integrity_payload *bip) |
338 | { | |
339 | return bip->bip_iter.bi_sector; | |
340 | } | |
341 | ||
342 | static inline void bip_set_seed(struct bio_integrity_payload *bip, | |
343 | sector_t seed) | |
344 | { | |
345 | bip->bip_iter.bi_sector = seed; | |
346 | } | |
347 | ||
7ba1ba12 | 348 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
1da177e4 | 349 | |
6678d83f | 350 | extern void bio_trim(struct bio *bio, int offset, int size); |
20d0189b KO |
351 | extern struct bio *bio_split(struct bio *bio, int sectors, |
352 | gfp_t gfp, struct bio_set *bs); | |
353 | ||
354 | /** | |
355 | * bio_next_split - get next @sectors from a bio, splitting if necessary | |
356 | * @bio: bio to split | |
357 | * @sectors: number of sectors to split from the front of @bio | |
358 | * @gfp: gfp mask | |
359 | * @bs: bio set to allocate from | |
360 | * | |
361 | * Returns a bio representing the next @sectors of @bio - if the bio is smaller | |
362 | * than @sectors, returns the original bio unchanged. | |
363 | */ | |
364 | static inline struct bio *bio_next_split(struct bio *bio, int sectors, | |
365 | gfp_t gfp, struct bio_set *bs) | |
366 | { | |
367 | if (sectors >= bio_sectors(bio)) | |
368 | return bio; | |
369 | ||
370 | return bio_split(bio, sectors, gfp, bs); | |
371 | } | |
372 | ||
bb799ca0 | 373 | extern struct bio_set *bioset_create(unsigned int, unsigned int); |
d8f429e1 | 374 | extern struct bio_set *bioset_create_nobvec(unsigned int, unsigned int); |
1da177e4 | 375 | extern void bioset_free(struct bio_set *); |
a6c39cb4 | 376 | extern mempool_t *biovec_create_pool(int pool_entries); |
1da177e4 | 377 | |
dd0fc66f | 378 | extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *); |
1da177e4 LT |
379 | extern void bio_put(struct bio *); |
380 | ||
59d276fe KO |
381 | extern void __bio_clone_fast(struct bio *, struct bio *); |
382 | extern struct bio *bio_clone_fast(struct bio *, gfp_t, struct bio_set *); | |
bf800ef1 KO |
383 | extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs); |
384 | ||
3f86a82a KO |
385 | extern struct bio_set *fs_bio_set; |
386 | ||
387 | static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) | |
388 | { | |
389 | return bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set); | |
390 | } | |
391 | ||
bf800ef1 KO |
392 | static inline struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask) |
393 | { | |
394 | return bio_clone_bioset(bio, gfp_mask, fs_bio_set); | |
395 | } | |
396 | ||
3f86a82a KO |
397 | static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs) |
398 | { | |
399 | return bio_alloc_bioset(gfp_mask, nr_iovecs, NULL); | |
400 | } | |
401 | ||
bf800ef1 KO |
402 | static inline struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask) |
403 | { | |
404 | return bio_clone_bioset(bio, gfp_mask, NULL); | |
405 | ||
406 | } | |
407 | ||
4246a0b6 CH |
408 | extern void bio_endio(struct bio *); |
409 | ||
410 | static inline void bio_io_error(struct bio *bio) | |
411 | { | |
412 | bio->bi_error = -EIO; | |
413 | bio_endio(bio); | |
414 | } | |
415 | ||
1da177e4 LT |
416 | struct request_queue; |
417 | extern int bio_phys_segments(struct request_queue *, struct bio *); | |
1da177e4 | 418 | |
4e49ea4a | 419 | extern int submit_bio_wait(struct bio *bio); |
054bdf64 KO |
420 | extern void bio_advance(struct bio *, unsigned); |
421 | ||
1da177e4 | 422 | extern void bio_init(struct bio *); |
f44b48c7 | 423 | extern void bio_reset(struct bio *); |
196d38bc | 424 | void bio_chain(struct bio *, struct bio *); |
1da177e4 LT |
425 | |
426 | extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int); | |
6e68af66 MC |
427 | extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *, |
428 | unsigned int, unsigned int); | |
152e283f | 429 | struct rq_map_data; |
f1970baf | 430 | extern struct bio *bio_map_user_iov(struct request_queue *, |
26e49cfc | 431 | const struct iov_iter *, gfp_t); |
1da177e4 | 432 | extern void bio_unmap_user(struct bio *); |
df46b9a4 | 433 | extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int, |
27496a8c | 434 | gfp_t); |
68154e90 FT |
435 | extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int, |
436 | gfp_t, int); | |
1da177e4 LT |
437 | extern void bio_set_pages_dirty(struct bio *bio); |
438 | extern void bio_check_pages_dirty(struct bio *bio); | |
2d4dc890 | 439 | |
394ffa50 GZ |
440 | void generic_start_io_acct(int rw, unsigned long sectors, |
441 | struct hd_struct *part); | |
442 | void generic_end_io_acct(int rw, struct hd_struct *part, | |
443 | unsigned long start_time); | |
444 | ||
2d4dc890 IL |
445 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
446 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
447 | #endif | |
448 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
449 | extern void bio_flush_dcache_pages(struct bio *bi); | |
450 | #else | |
451 | static inline void bio_flush_dcache_pages(struct bio *bi) | |
452 | { | |
453 | } | |
454 | #endif | |
455 | ||
16ac3d63 | 456 | extern void bio_copy_data(struct bio *dst, struct bio *src); |
a0787606 | 457 | extern int bio_alloc_pages(struct bio *bio, gfp_t gfp); |
16ac3d63 | 458 | |
152e283f | 459 | extern struct bio *bio_copy_user_iov(struct request_queue *, |
86d564c8 | 460 | struct rq_map_data *, |
26e49cfc KO |
461 | const struct iov_iter *, |
462 | gfp_t); | |
1da177e4 LT |
463 | extern int bio_uncopy_user(struct bio *); |
464 | void zero_fill_bio(struct bio *bio); | |
9f060e22 KO |
465 | extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *); |
466 | extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int); | |
7ba1ba12 | 467 | extern unsigned int bvec_nr_vecs(unsigned short idx); |
51d654e1 | 468 | |
852c788f | 469 | #ifdef CONFIG_BLK_CGROUP |
1d933cf0 | 470 | int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css); |
852c788f TH |
471 | int bio_associate_current(struct bio *bio); |
472 | void bio_disassociate_task(struct bio *bio); | |
473 | #else /* CONFIG_BLK_CGROUP */ | |
1d933cf0 TH |
474 | static inline int bio_associate_blkcg(struct bio *bio, |
475 | struct cgroup_subsys_state *blkcg_css) { return 0; } | |
852c788f TH |
476 | static inline int bio_associate_current(struct bio *bio) { return -ENOENT; } |
477 | static inline void bio_disassociate_task(struct bio *bio) { } | |
478 | #endif /* CONFIG_BLK_CGROUP */ | |
479 | ||
1da177e4 LT |
480 | #ifdef CONFIG_HIGHMEM |
481 | /* | |
20b636bf AB |
482 | * remember never ever reenable interrupts between a bvec_kmap_irq and |
483 | * bvec_kunmap_irq! | |
1da177e4 | 484 | */ |
4f570f99 | 485 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
1da177e4 LT |
486 | { |
487 | unsigned long addr; | |
488 | ||
489 | /* | |
490 | * might not be a highmem page, but the preempt/irq count | |
491 | * balancing is a lot nicer this way | |
492 | */ | |
493 | local_irq_save(*flags); | |
e8e3c3d6 | 494 | addr = (unsigned long) kmap_atomic(bvec->bv_page); |
1da177e4 LT |
495 | |
496 | BUG_ON(addr & ~PAGE_MASK); | |
497 | ||
498 | return (char *) addr + bvec->bv_offset; | |
499 | } | |
500 | ||
4f570f99 | 501 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) |
1da177e4 LT |
502 | { |
503 | unsigned long ptr = (unsigned long) buffer & PAGE_MASK; | |
504 | ||
e8e3c3d6 | 505 | kunmap_atomic((void *) ptr); |
1da177e4 LT |
506 | local_irq_restore(*flags); |
507 | } | |
508 | ||
509 | #else | |
11a691be GU |
510 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
511 | { | |
512 | return page_address(bvec->bv_page) + bvec->bv_offset; | |
513 | } | |
514 | ||
515 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) | |
516 | { | |
517 | *flags = 0; | |
518 | } | |
1da177e4 LT |
519 | #endif |
520 | ||
f619d254 | 521 | static inline char *__bio_kmap_irq(struct bio *bio, struct bvec_iter iter, |
1da177e4 LT |
522 | unsigned long *flags) |
523 | { | |
f619d254 | 524 | return bvec_kmap_irq(&bio_iter_iovec(bio, iter), flags); |
1da177e4 LT |
525 | } |
526 | #define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags) | |
527 | ||
528 | #define bio_kmap_irq(bio, flags) \ | |
f619d254 | 529 | __bio_kmap_irq((bio), (bio)->bi_iter, (flags)) |
1da177e4 LT |
530 | #define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags) |
531 | ||
8f3d8ba2 | 532 | /* |
e686307f | 533 | * BIO list management for use by remapping drivers (e.g. DM or MD) and loop. |
8f3d8ba2 CH |
534 | * |
535 | * A bio_list anchors a singly-linked list of bios chained through the bi_next | |
536 | * member of the bio. The bio_list also caches the last list member to allow | |
537 | * fast access to the tail. | |
538 | */ | |
539 | struct bio_list { | |
540 | struct bio *head; | |
541 | struct bio *tail; | |
542 | }; | |
543 | ||
544 | static inline int bio_list_empty(const struct bio_list *bl) | |
545 | { | |
546 | return bl->head == NULL; | |
547 | } | |
548 | ||
549 | static inline void bio_list_init(struct bio_list *bl) | |
550 | { | |
551 | bl->head = bl->tail = NULL; | |
552 | } | |
553 | ||
320ae51f JA |
554 | #define BIO_EMPTY_LIST { NULL, NULL } |
555 | ||
8f3d8ba2 CH |
556 | #define bio_list_for_each(bio, bl) \ |
557 | for (bio = (bl)->head; bio; bio = bio->bi_next) | |
558 | ||
559 | static inline unsigned bio_list_size(const struct bio_list *bl) | |
560 | { | |
561 | unsigned sz = 0; | |
562 | struct bio *bio; | |
563 | ||
564 | bio_list_for_each(bio, bl) | |
565 | sz++; | |
566 | ||
567 | return sz; | |
568 | } | |
569 | ||
570 | static inline void bio_list_add(struct bio_list *bl, struct bio *bio) | |
571 | { | |
572 | bio->bi_next = NULL; | |
573 | ||
574 | if (bl->tail) | |
575 | bl->tail->bi_next = bio; | |
576 | else | |
577 | bl->head = bio; | |
578 | ||
579 | bl->tail = bio; | |
580 | } | |
581 | ||
582 | static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio) | |
583 | { | |
584 | bio->bi_next = bl->head; | |
585 | ||
586 | bl->head = bio; | |
587 | ||
588 | if (!bl->tail) | |
589 | bl->tail = bio; | |
590 | } | |
591 | ||
592 | static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2) | |
593 | { | |
594 | if (!bl2->head) | |
595 | return; | |
596 | ||
597 | if (bl->tail) | |
598 | bl->tail->bi_next = bl2->head; | |
599 | else | |
600 | bl->head = bl2->head; | |
601 | ||
602 | bl->tail = bl2->tail; | |
603 | } | |
604 | ||
605 | static inline void bio_list_merge_head(struct bio_list *bl, | |
606 | struct bio_list *bl2) | |
607 | { | |
608 | if (!bl2->head) | |
609 | return; | |
610 | ||
611 | if (bl->head) | |
612 | bl2->tail->bi_next = bl->head; | |
613 | else | |
614 | bl->tail = bl2->tail; | |
615 | ||
616 | bl->head = bl2->head; | |
617 | } | |
618 | ||
13685a16 GU |
619 | static inline struct bio *bio_list_peek(struct bio_list *bl) |
620 | { | |
621 | return bl->head; | |
622 | } | |
623 | ||
8f3d8ba2 CH |
624 | static inline struct bio *bio_list_pop(struct bio_list *bl) |
625 | { | |
626 | struct bio *bio = bl->head; | |
627 | ||
628 | if (bio) { | |
629 | bl->head = bl->head->bi_next; | |
630 | if (!bl->head) | |
631 | bl->tail = NULL; | |
632 | ||
633 | bio->bi_next = NULL; | |
634 | } | |
635 | ||
636 | return bio; | |
637 | } | |
638 | ||
639 | static inline struct bio *bio_list_get(struct bio_list *bl) | |
640 | { | |
641 | struct bio *bio = bl->head; | |
642 | ||
643 | bl->head = bl->tail = NULL; | |
644 | ||
645 | return bio; | |
646 | } | |
647 | ||
0ef5a50c MS |
648 | /* |
649 | * Increment chain count for the bio. Make sure the CHAIN flag update | |
650 | * is visible before the raised count. | |
651 | */ | |
652 | static inline void bio_inc_remaining(struct bio *bio) | |
653 | { | |
654 | bio_set_flag(bio, BIO_CHAIN); | |
655 | smp_mb__before_atomic(); | |
656 | atomic_inc(&bio->__bi_remaining); | |
657 | } | |
658 | ||
57fb233f KO |
659 | /* |
660 | * bio_set is used to allow other portions of the IO system to | |
661 | * allocate their own private memory pools for bio and iovec structures. | |
662 | * These memory pools in turn all allocate from the bio_slab | |
663 | * and the bvec_slabs[]. | |
664 | */ | |
665 | #define BIO_POOL_SIZE 2 | |
57fb233f KO |
666 | |
667 | struct bio_set { | |
668 | struct kmem_cache *bio_slab; | |
669 | unsigned int front_pad; | |
670 | ||
671 | mempool_t *bio_pool; | |
9f060e22 | 672 | mempool_t *bvec_pool; |
57fb233f KO |
673 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
674 | mempool_t *bio_integrity_pool; | |
9f060e22 | 675 | mempool_t *bvec_integrity_pool; |
57fb233f | 676 | #endif |
df2cb6da KO |
677 | |
678 | /* | |
679 | * Deadlock avoidance for stacking block drivers: see comments in | |
680 | * bio_alloc_bioset() for details | |
681 | */ | |
682 | spinlock_t rescue_lock; | |
683 | struct bio_list rescue_list; | |
684 | struct work_struct rescue_work; | |
685 | struct workqueue_struct *rescue_workqueue; | |
57fb233f KO |
686 | }; |
687 | ||
688 | struct biovec_slab { | |
689 | int nr_vecs; | |
690 | char *name; | |
691 | struct kmem_cache *slab; | |
692 | }; | |
693 | ||
694 | /* | |
695 | * a small number of entries is fine, not going to be performance critical. | |
696 | * basically we just need to survive | |
697 | */ | |
698 | #define BIO_SPLIT_ENTRIES 2 | |
699 | ||
7ba1ba12 MP |
700 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
701 | ||
d57a5f7c KO |
702 | #define bip_for_each_vec(bvl, bip, iter) \ |
703 | for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter) | |
7ba1ba12 | 704 | |
13f05c8d MP |
705 | #define bio_for_each_integrity_vec(_bvl, _bio, _iter) \ |
706 | for_each_bio(_bio) \ | |
707 | bip_for_each_vec(_bvl, _bio->bi_integrity, _iter) | |
708 | ||
7ba1ba12 | 709 | extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int); |
1e2a410f | 710 | extern void bio_integrity_free(struct bio *); |
7ba1ba12 | 711 | extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int); |
e7258c1a | 712 | extern bool bio_integrity_enabled(struct bio *bio); |
7ba1ba12 | 713 | extern int bio_integrity_prep(struct bio *); |
4246a0b6 | 714 | extern void bio_integrity_endio(struct bio *); |
7ba1ba12 MP |
715 | extern void bio_integrity_advance(struct bio *, unsigned int); |
716 | extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int); | |
1e2a410f | 717 | extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t); |
7878cba9 MP |
718 | extern int bioset_integrity_create(struct bio_set *, int); |
719 | extern void bioset_integrity_free(struct bio_set *); | |
720 | extern void bio_integrity_init(void); | |
7ba1ba12 MP |
721 | |
722 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
723 | ||
c611529e | 724 | static inline void *bio_integrity(struct bio *bio) |
6898e3bd | 725 | { |
c611529e | 726 | return NULL; |
6898e3bd MP |
727 | } |
728 | ||
e7258c1a | 729 | static inline bool bio_integrity_enabled(struct bio *bio) |
6898e3bd | 730 | { |
e7258c1a | 731 | return false; |
6898e3bd MP |
732 | } |
733 | ||
734 | static inline int bioset_integrity_create(struct bio_set *bs, int pool_size) | |
735 | { | |
736 | return 0; | |
737 | } | |
738 | ||
739 | static inline void bioset_integrity_free (struct bio_set *bs) | |
740 | { | |
741 | return; | |
742 | } | |
743 | ||
744 | static inline int bio_integrity_prep(struct bio *bio) | |
745 | { | |
746 | return 0; | |
747 | } | |
748 | ||
1e2a410f | 749 | static inline void bio_integrity_free(struct bio *bio) |
6898e3bd MP |
750 | { |
751 | return; | |
752 | } | |
753 | ||
0c614e2d | 754 | static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
1e2a410f | 755 | gfp_t gfp_mask) |
0c614e2d SR |
756 | { |
757 | return 0; | |
758 | } | |
6898e3bd | 759 | |
6898e3bd MP |
760 | static inline void bio_integrity_advance(struct bio *bio, |
761 | unsigned int bytes_done) | |
762 | { | |
763 | return; | |
764 | } | |
765 | ||
766 | static inline void bio_integrity_trim(struct bio *bio, unsigned int offset, | |
767 | unsigned int sectors) | |
768 | { | |
769 | return; | |
770 | } | |
771 | ||
772 | static inline void bio_integrity_init(void) | |
773 | { | |
774 | return; | |
775 | } | |
7ba1ba12 | 776 | |
c611529e MP |
777 | static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag) |
778 | { | |
779 | return false; | |
780 | } | |
781 | ||
06c1e390 KB |
782 | static inline void *bio_integrity_alloc(struct bio * bio, gfp_t gfp, |
783 | unsigned int nr) | |
784 | { | |
785 | return ERR_PTR(-EINVAL); | |
786 | } | |
787 | ||
788 | static inline int bio_integrity_add_page(struct bio *bio, struct page *page, | |
789 | unsigned int len, unsigned int offset) | |
790 | { | |
791 | return 0; | |
792 | } | |
793 | ||
7ba1ba12 MP |
794 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
795 | ||
02a5e0ac | 796 | #endif /* CONFIG_BLOCK */ |
1da177e4 | 797 | #endif /* __LINUX_BIO_H */ |