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Commit | Line | Data |
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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 | |
4550dd6c KO |
50 | #define bio_iter_iovec(bio, iter) \ |
51 | bvec_iter_bvec((bio)->bi_io_vec, (iter)) | |
52 | ||
53 | #define bio_iter_page(bio, iter) \ | |
54 | bvec_iter_page((bio)->bi_io_vec, (iter)) | |
55 | #define bio_iter_len(bio, iter) \ | |
56 | bvec_iter_len((bio)->bi_io_vec, (iter)) | |
57 | #define bio_iter_offset(bio, iter) \ | |
58 | bvec_iter_offset((bio)->bi_io_vec, (iter)) | |
59 | ||
60 | #define bio_page(bio) bio_iter_page((bio), (bio)->bi_iter) | |
61 | #define bio_offset(bio) bio_iter_offset((bio), (bio)->bi_iter) | |
62 | #define bio_iovec(bio) bio_iter_iovec((bio), (bio)->bi_iter) | |
7988613b | 63 | |
458b76ed KO |
64 | #define bio_multiple_segments(bio) \ |
65 | ((bio)->bi_iter.bi_size != bio_iovec(bio).bv_len) | |
4f024f37 KO |
66 | #define bio_sectors(bio) ((bio)->bi_iter.bi_size >> 9) |
67 | #define bio_end_sector(bio) ((bio)->bi_iter.bi_sector + bio_sectors((bio))) | |
bf2de6f5 | 68 | |
458b76ed KO |
69 | /* |
70 | * Check whether this bio carries any data or not. A NULL bio is allowed. | |
71 | */ | |
72 | static inline bool bio_has_data(struct bio *bio) | |
73 | { | |
74 | if (bio && | |
75 | bio->bi_iter.bi_size && | |
95fe6c1a | 76 | bio_op(bio) != REQ_OP_DISCARD) |
458b76ed KO |
77 | return true; |
78 | ||
79 | return false; | |
80 | } | |
81 | ||
95fe6c1a MC |
82 | static inline bool bio_no_advance_iter(struct bio *bio) |
83 | { | |
84 | return bio_op(bio) == REQ_OP_DISCARD || bio_op(bio) == REQ_OP_WRITE_SAME; | |
85 | } | |
86 | ||
458b76ed KO |
87 | static inline bool bio_is_rw(struct bio *bio) |
88 | { | |
89 | if (!bio_has_data(bio)) | |
90 | return false; | |
91 | ||
95fe6c1a | 92 | if (bio_no_advance_iter(bio)) |
458b76ed KO |
93 | return false; |
94 | ||
95 | return true; | |
96 | } | |
97 | ||
98 | static inline bool bio_mergeable(struct bio *bio) | |
99 | { | |
100 | if (bio->bi_rw & REQ_NOMERGE_FLAGS) | |
101 | return false; | |
102 | ||
103 | return true; | |
104 | } | |
105 | ||
2e46e8b2 | 106 | static inline unsigned int bio_cur_bytes(struct bio *bio) |
bf2de6f5 | 107 | { |
458b76ed | 108 | if (bio_has_data(bio)) |
a4ad39b1 | 109 | return bio_iovec(bio).bv_len; |
fb2dce86 | 110 | else /* dataless requests such as discard */ |
4f024f37 | 111 | return bio->bi_iter.bi_size; |
bf2de6f5 JA |
112 | } |
113 | ||
114 | static inline void *bio_data(struct bio *bio) | |
115 | { | |
458b76ed | 116 | if (bio_has_data(bio)) |
bf2de6f5 JA |
117 | return page_address(bio_page(bio)) + bio_offset(bio); |
118 | ||
119 | return NULL; | |
120 | } | |
1da177e4 LT |
121 | |
122 | /* | |
123 | * will die | |
124 | */ | |
125 | #define bio_to_phys(bio) (page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio))) | |
126 | #define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset) | |
127 | ||
128 | /* | |
129 | * queues that have highmem support enabled may still need to revert to | |
130 | * PIO transfers occasionally and thus map high pages temporarily. For | |
131 | * permanent PIO fall back, user is probably better off disabling highmem | |
132 | * I/O completely on that queue (see ide-dma for example) | |
133 | */ | |
f619d254 KO |
134 | #define __bio_kmap_atomic(bio, iter) \ |
135 | (kmap_atomic(bio_iter_iovec((bio), (iter)).bv_page) + \ | |
136 | bio_iter_iovec((bio), (iter)).bv_offset) | |
1da177e4 | 137 | |
f619d254 | 138 | #define __bio_kunmap_atomic(addr) kunmap_atomic(addr) |
1da177e4 LT |
139 | |
140 | /* | |
141 | * merge helpers etc | |
142 | */ | |
143 | ||
f92131c3 JF |
144 | /* Default implementation of BIOVEC_PHYS_MERGEABLE */ |
145 | #define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ | |
146 | ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2))) | |
147 | ||
1da177e4 LT |
148 | /* |
149 | * allow arch override, for eg virtualized architectures (put in asm/io.h) | |
150 | */ | |
151 | #ifndef BIOVEC_PHYS_MERGEABLE | |
152 | #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ | |
f92131c3 | 153 | __BIOVEC_PHYS_MERGEABLE(vec1, vec2) |
1da177e4 LT |
154 | #endif |
155 | ||
1da177e4 LT |
156 | #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \ |
157 | (((addr1) | (mask)) == (((addr2) - 1) | (mask))) | |
158 | #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \ | |
ae03bf63 | 159 | __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q))) |
1da177e4 | 160 | |
d74c6d51 KO |
161 | /* |
162 | * drivers should _never_ use the all version - the bio may have been split | |
163 | * before it got to the driver and the driver won't own all of it | |
164 | */ | |
165 | #define bio_for_each_segment_all(bvl, bio, i) \ | |
f619d254 | 166 | for (i = 0, bvl = (bio)->bi_io_vec; i < (bio)->bi_vcnt; i++, bvl++) |
d74c6d51 | 167 | |
4550dd6c KO |
168 | static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter, |
169 | unsigned bytes) | |
170 | { | |
171 | iter->bi_sector += bytes >> 9; | |
172 | ||
95fe6c1a | 173 | if (bio_no_advance_iter(bio)) |
4550dd6c KO |
174 | iter->bi_size -= bytes; |
175 | else | |
176 | bvec_iter_advance(bio->bi_io_vec, iter, bytes); | |
177 | } | |
178 | ||
7988613b KO |
179 | #define __bio_for_each_segment(bvl, bio, iter, start) \ |
180 | for (iter = (start); \ | |
4550dd6c KO |
181 | (iter).bi_size && \ |
182 | ((bvl = bio_iter_iovec((bio), (iter))), 1); \ | |
183 | bio_advance_iter((bio), &(iter), (bvl).bv_len)) | |
7988613b KO |
184 | |
185 | #define bio_for_each_segment(bvl, bio, iter) \ | |
186 | __bio_for_each_segment(bvl, bio, iter, (bio)->bi_iter) | |
187 | ||
4550dd6c | 188 | #define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len) |
1da177e4 | 189 | |
458b76ed KO |
190 | static inline unsigned bio_segments(struct bio *bio) |
191 | { | |
192 | unsigned segs = 0; | |
193 | struct bio_vec bv; | |
194 | struct bvec_iter iter; | |
195 | ||
8423ae3d KO |
196 | /* |
197 | * We special case discard/write same, because they interpret bi_size | |
198 | * differently: | |
199 | */ | |
200 | ||
95fe6c1a | 201 | if (bio_op(bio) == REQ_OP_DISCARD) |
8423ae3d KO |
202 | return 1; |
203 | ||
95fe6c1a | 204 | if (bio_op(bio) == REQ_OP_WRITE_SAME) |
8423ae3d KO |
205 | return 1; |
206 | ||
458b76ed KO |
207 | bio_for_each_segment(bv, bio, iter) |
208 | segs++; | |
209 | ||
210 | return segs; | |
211 | } | |
212 | ||
1da177e4 LT |
213 | /* |
214 | * get a reference to a bio, so it won't disappear. the intended use is | |
215 | * something like: | |
216 | * | |
217 | * bio_get(bio); | |
218 | * submit_bio(rw, bio); | |
219 | * if (bio->bi_flags ...) | |
220 | * do_something | |
221 | * bio_put(bio); | |
222 | * | |
223 | * without the bio_get(), it could potentially complete I/O before submit_bio | |
224 | * returns. and then bio would be freed memory when if (bio->bi_flags ...) | |
225 | * runs | |
226 | */ | |
dac56212 JA |
227 | static inline void bio_get(struct bio *bio) |
228 | { | |
229 | bio->bi_flags |= (1 << BIO_REFFED); | |
230 | smp_mb__before_atomic(); | |
231 | atomic_inc(&bio->__bi_cnt); | |
232 | } | |
233 | ||
234 | static inline void bio_cnt_set(struct bio *bio, unsigned int count) | |
235 | { | |
236 | if (count != 1) { | |
237 | bio->bi_flags |= (1 << BIO_REFFED); | |
238 | smp_mb__before_atomic(); | |
239 | } | |
240 | atomic_set(&bio->__bi_cnt, count); | |
241 | } | |
1da177e4 | 242 | |
b7c44ed9 JA |
243 | static inline bool bio_flagged(struct bio *bio, unsigned int bit) |
244 | { | |
2c68f6dc | 245 | return (bio->bi_flags & (1U << bit)) != 0; |
b7c44ed9 JA |
246 | } |
247 | ||
248 | static inline void bio_set_flag(struct bio *bio, unsigned int bit) | |
249 | { | |
2c68f6dc | 250 | bio->bi_flags |= (1U << bit); |
b7c44ed9 JA |
251 | } |
252 | ||
253 | static inline void bio_clear_flag(struct bio *bio, unsigned int bit) | |
254 | { | |
2c68f6dc | 255 | bio->bi_flags &= ~(1U << bit); |
b7c44ed9 JA |
256 | } |
257 | ||
7bcd79ac ML |
258 | static inline void bio_get_first_bvec(struct bio *bio, struct bio_vec *bv) |
259 | { | |
260 | *bv = bio_iovec(bio); | |
261 | } | |
262 | ||
263 | static inline void bio_get_last_bvec(struct bio *bio, struct bio_vec *bv) | |
264 | { | |
265 | struct bvec_iter iter = bio->bi_iter; | |
266 | int idx; | |
267 | ||
7bcd79ac ML |
268 | if (unlikely(!bio_multiple_segments(bio))) { |
269 | *bv = bio_iovec(bio); | |
270 | return; | |
271 | } | |
272 | ||
273 | bio_advance_iter(bio, &iter, iter.bi_size); | |
274 | ||
275 | if (!iter.bi_bvec_done) | |
276 | idx = iter.bi_idx - 1; | |
277 | else /* in the middle of bvec */ | |
278 | idx = iter.bi_idx; | |
279 | ||
280 | *bv = bio->bi_io_vec[idx]; | |
281 | ||
282 | /* | |
283 | * iter.bi_bvec_done records actual length of the last bvec | |
284 | * if this bio ends in the middle of one io vector | |
285 | */ | |
286 | if (iter.bi_bvec_done) | |
287 | bv->bv_len = iter.bi_bvec_done; | |
288 | } | |
289 | ||
c611529e MP |
290 | enum bip_flags { |
291 | BIP_BLOCK_INTEGRITY = 1 << 0, /* block layer owns integrity data */ | |
292 | BIP_MAPPED_INTEGRITY = 1 << 1, /* ref tag has been remapped */ | |
293 | BIP_CTRL_NOCHECK = 1 << 2, /* disable HBA integrity checking */ | |
294 | BIP_DISK_NOCHECK = 1 << 3, /* disable disk integrity checking */ | |
295 | BIP_IP_CHECKSUM = 1 << 4, /* IP checksum */ | |
296 | }; | |
297 | ||
7ba1ba12 MP |
298 | /* |
299 | * bio integrity payload | |
300 | */ | |
301 | struct bio_integrity_payload { | |
302 | struct bio *bip_bio; /* parent bio */ | |
7ba1ba12 | 303 | |
d57a5f7c | 304 | struct bvec_iter bip_iter; |
7ba1ba12 | 305 | |
d57a5f7c | 306 | bio_end_io_t *bip_end_io; /* saved I/O completion fn */ |
7ba1ba12 | 307 | |
7878cba9 | 308 | unsigned short bip_slab; /* slab the bip came from */ |
7ba1ba12 | 309 | unsigned short bip_vcnt; /* # of integrity bio_vecs */ |
cbcd1054 | 310 | unsigned short bip_max_vcnt; /* integrity bio_vec slots */ |
b1f01388 | 311 | unsigned short bip_flags; /* control flags */ |
7ba1ba12 MP |
312 | |
313 | struct work_struct bip_work; /* I/O completion */ | |
6fda981c KO |
314 | |
315 | struct bio_vec *bip_vec; | |
316 | struct bio_vec bip_inline_vecs[0];/* embedded bvec array */ | |
7ba1ba12 | 317 | }; |
18593088 | 318 | |
06c1e390 KB |
319 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
320 | ||
321 | static inline struct bio_integrity_payload *bio_integrity(struct bio *bio) | |
322 | { | |
323 | if (bio->bi_rw & REQ_INTEGRITY) | |
324 | return bio->bi_integrity; | |
325 | ||
326 | return NULL; | |
327 | } | |
328 | ||
c611529e MP |
329 | static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag) |
330 | { | |
331 | struct bio_integrity_payload *bip = bio_integrity(bio); | |
332 | ||
333 | if (bip) | |
334 | return bip->bip_flags & flag; | |
335 | ||
336 | return false; | |
337 | } | |
b1f01388 | 338 | |
18593088 MP |
339 | static inline sector_t bip_get_seed(struct bio_integrity_payload *bip) |
340 | { | |
341 | return bip->bip_iter.bi_sector; | |
342 | } | |
343 | ||
344 | static inline void bip_set_seed(struct bio_integrity_payload *bip, | |
345 | sector_t seed) | |
346 | { | |
347 | bip->bip_iter.bi_sector = seed; | |
348 | } | |
349 | ||
7ba1ba12 | 350 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
1da177e4 | 351 | |
6678d83f | 352 | extern void bio_trim(struct bio *bio, int offset, int size); |
20d0189b KO |
353 | extern struct bio *bio_split(struct bio *bio, int sectors, |
354 | gfp_t gfp, struct bio_set *bs); | |
355 | ||
356 | /** | |
357 | * bio_next_split - get next @sectors from a bio, splitting if necessary | |
358 | * @bio: bio to split | |
359 | * @sectors: number of sectors to split from the front of @bio | |
360 | * @gfp: gfp mask | |
361 | * @bs: bio set to allocate from | |
362 | * | |
363 | * Returns a bio representing the next @sectors of @bio - if the bio is smaller | |
364 | * than @sectors, returns the original bio unchanged. | |
365 | */ | |
366 | static inline struct bio *bio_next_split(struct bio *bio, int sectors, | |
367 | gfp_t gfp, struct bio_set *bs) | |
368 | { | |
369 | if (sectors >= bio_sectors(bio)) | |
370 | return bio; | |
371 | ||
372 | return bio_split(bio, sectors, gfp, bs); | |
373 | } | |
374 | ||
bb799ca0 | 375 | extern struct bio_set *bioset_create(unsigned int, unsigned int); |
d8f429e1 | 376 | extern struct bio_set *bioset_create_nobvec(unsigned int, unsigned int); |
1da177e4 | 377 | extern void bioset_free(struct bio_set *); |
a6c39cb4 | 378 | extern mempool_t *biovec_create_pool(int pool_entries); |
1da177e4 | 379 | |
dd0fc66f | 380 | extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *); |
1da177e4 LT |
381 | extern void bio_put(struct bio *); |
382 | ||
59d276fe KO |
383 | extern void __bio_clone_fast(struct bio *, struct bio *); |
384 | extern struct bio *bio_clone_fast(struct bio *, gfp_t, struct bio_set *); | |
bf800ef1 KO |
385 | extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs); |
386 | ||
3f86a82a KO |
387 | extern struct bio_set *fs_bio_set; |
388 | ||
389 | static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) | |
390 | { | |
391 | return bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set); | |
392 | } | |
393 | ||
bf800ef1 KO |
394 | static inline struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask) |
395 | { | |
396 | return bio_clone_bioset(bio, gfp_mask, fs_bio_set); | |
397 | } | |
398 | ||
3f86a82a KO |
399 | static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs) |
400 | { | |
401 | return bio_alloc_bioset(gfp_mask, nr_iovecs, NULL); | |
402 | } | |
403 | ||
bf800ef1 KO |
404 | static inline struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask) |
405 | { | |
406 | return bio_clone_bioset(bio, gfp_mask, NULL); | |
407 | ||
408 | } | |
409 | ||
4246a0b6 CH |
410 | extern void bio_endio(struct bio *); |
411 | ||
412 | static inline void bio_io_error(struct bio *bio) | |
413 | { | |
414 | bio->bi_error = -EIO; | |
415 | bio_endio(bio); | |
416 | } | |
417 | ||
1da177e4 LT |
418 | struct request_queue; |
419 | extern int bio_phys_segments(struct request_queue *, struct bio *); | |
1da177e4 | 420 | |
4e49ea4a | 421 | extern int submit_bio_wait(struct bio *bio); |
054bdf64 KO |
422 | extern void bio_advance(struct bio *, unsigned); |
423 | ||
1da177e4 | 424 | extern void bio_init(struct bio *); |
f44b48c7 | 425 | extern void bio_reset(struct bio *); |
196d38bc | 426 | void bio_chain(struct bio *, struct bio *); |
1da177e4 LT |
427 | |
428 | extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int); | |
6e68af66 MC |
429 | extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *, |
430 | unsigned int, unsigned int); | |
152e283f | 431 | struct rq_map_data; |
f1970baf | 432 | extern struct bio *bio_map_user_iov(struct request_queue *, |
26e49cfc | 433 | const struct iov_iter *, gfp_t); |
1da177e4 | 434 | extern void bio_unmap_user(struct bio *); |
df46b9a4 | 435 | extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int, |
27496a8c | 436 | gfp_t); |
68154e90 FT |
437 | extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int, |
438 | gfp_t, int); | |
1da177e4 LT |
439 | extern void bio_set_pages_dirty(struct bio *bio); |
440 | extern void bio_check_pages_dirty(struct bio *bio); | |
2d4dc890 | 441 | |
394ffa50 GZ |
442 | void generic_start_io_acct(int rw, unsigned long sectors, |
443 | struct hd_struct *part); | |
444 | void generic_end_io_acct(int rw, struct hd_struct *part, | |
445 | unsigned long start_time); | |
446 | ||
2d4dc890 IL |
447 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
448 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
449 | #endif | |
450 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
451 | extern void bio_flush_dcache_pages(struct bio *bi); | |
452 | #else | |
453 | static inline void bio_flush_dcache_pages(struct bio *bi) | |
454 | { | |
455 | } | |
456 | #endif | |
457 | ||
16ac3d63 | 458 | extern void bio_copy_data(struct bio *dst, struct bio *src); |
a0787606 | 459 | extern int bio_alloc_pages(struct bio *bio, gfp_t gfp); |
16ac3d63 | 460 | |
152e283f | 461 | extern struct bio *bio_copy_user_iov(struct request_queue *, |
86d564c8 | 462 | struct rq_map_data *, |
26e49cfc KO |
463 | const struct iov_iter *, |
464 | gfp_t); | |
1da177e4 LT |
465 | extern int bio_uncopy_user(struct bio *); |
466 | void zero_fill_bio(struct bio *bio); | |
9f060e22 KO |
467 | extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *); |
468 | extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int); | |
7ba1ba12 | 469 | extern unsigned int bvec_nr_vecs(unsigned short idx); |
51d654e1 | 470 | |
852c788f | 471 | #ifdef CONFIG_BLK_CGROUP |
1d933cf0 | 472 | int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css); |
852c788f TH |
473 | int bio_associate_current(struct bio *bio); |
474 | void bio_disassociate_task(struct bio *bio); | |
475 | #else /* CONFIG_BLK_CGROUP */ | |
1d933cf0 TH |
476 | static inline int bio_associate_blkcg(struct bio *bio, |
477 | struct cgroup_subsys_state *blkcg_css) { return 0; } | |
852c788f TH |
478 | static inline int bio_associate_current(struct bio *bio) { return -ENOENT; } |
479 | static inline void bio_disassociate_task(struct bio *bio) { } | |
480 | #endif /* CONFIG_BLK_CGROUP */ | |
481 | ||
1da177e4 LT |
482 | #ifdef CONFIG_HIGHMEM |
483 | /* | |
20b636bf AB |
484 | * remember never ever reenable interrupts between a bvec_kmap_irq and |
485 | * bvec_kunmap_irq! | |
1da177e4 | 486 | */ |
4f570f99 | 487 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
1da177e4 LT |
488 | { |
489 | unsigned long addr; | |
490 | ||
491 | /* | |
492 | * might not be a highmem page, but the preempt/irq count | |
493 | * balancing is a lot nicer this way | |
494 | */ | |
495 | local_irq_save(*flags); | |
e8e3c3d6 | 496 | addr = (unsigned long) kmap_atomic(bvec->bv_page); |
1da177e4 LT |
497 | |
498 | BUG_ON(addr & ~PAGE_MASK); | |
499 | ||
500 | return (char *) addr + bvec->bv_offset; | |
501 | } | |
502 | ||
4f570f99 | 503 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) |
1da177e4 LT |
504 | { |
505 | unsigned long ptr = (unsigned long) buffer & PAGE_MASK; | |
506 | ||
e8e3c3d6 | 507 | kunmap_atomic((void *) ptr); |
1da177e4 LT |
508 | local_irq_restore(*flags); |
509 | } | |
510 | ||
511 | #else | |
11a691be GU |
512 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
513 | { | |
514 | return page_address(bvec->bv_page) + bvec->bv_offset; | |
515 | } | |
516 | ||
517 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) | |
518 | { | |
519 | *flags = 0; | |
520 | } | |
1da177e4 LT |
521 | #endif |
522 | ||
f619d254 | 523 | static inline char *__bio_kmap_irq(struct bio *bio, struct bvec_iter iter, |
1da177e4 LT |
524 | unsigned long *flags) |
525 | { | |
f619d254 | 526 | return bvec_kmap_irq(&bio_iter_iovec(bio, iter), flags); |
1da177e4 LT |
527 | } |
528 | #define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags) | |
529 | ||
530 | #define bio_kmap_irq(bio, flags) \ | |
f619d254 | 531 | __bio_kmap_irq((bio), (bio)->bi_iter, (flags)) |
1da177e4 LT |
532 | #define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags) |
533 | ||
8f3d8ba2 | 534 | /* |
e686307f | 535 | * BIO list management for use by remapping drivers (e.g. DM or MD) and loop. |
8f3d8ba2 CH |
536 | * |
537 | * A bio_list anchors a singly-linked list of bios chained through the bi_next | |
538 | * member of the bio. The bio_list also caches the last list member to allow | |
539 | * fast access to the tail. | |
540 | */ | |
541 | struct bio_list { | |
542 | struct bio *head; | |
543 | struct bio *tail; | |
544 | }; | |
545 | ||
546 | static inline int bio_list_empty(const struct bio_list *bl) | |
547 | { | |
548 | return bl->head == NULL; | |
549 | } | |
550 | ||
551 | static inline void bio_list_init(struct bio_list *bl) | |
552 | { | |
553 | bl->head = bl->tail = NULL; | |
554 | } | |
555 | ||
320ae51f JA |
556 | #define BIO_EMPTY_LIST { NULL, NULL } |
557 | ||
8f3d8ba2 CH |
558 | #define bio_list_for_each(bio, bl) \ |
559 | for (bio = (bl)->head; bio; bio = bio->bi_next) | |
560 | ||
561 | static inline unsigned bio_list_size(const struct bio_list *bl) | |
562 | { | |
563 | unsigned sz = 0; | |
564 | struct bio *bio; | |
565 | ||
566 | bio_list_for_each(bio, bl) | |
567 | sz++; | |
568 | ||
569 | return sz; | |
570 | } | |
571 | ||
572 | static inline void bio_list_add(struct bio_list *bl, struct bio *bio) | |
573 | { | |
574 | bio->bi_next = NULL; | |
575 | ||
576 | if (bl->tail) | |
577 | bl->tail->bi_next = bio; | |
578 | else | |
579 | bl->head = bio; | |
580 | ||
581 | bl->tail = bio; | |
582 | } | |
583 | ||
584 | static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio) | |
585 | { | |
586 | bio->bi_next = bl->head; | |
587 | ||
588 | bl->head = bio; | |
589 | ||
590 | if (!bl->tail) | |
591 | bl->tail = bio; | |
592 | } | |
593 | ||
594 | static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2) | |
595 | { | |
596 | if (!bl2->head) | |
597 | return; | |
598 | ||
599 | if (bl->tail) | |
600 | bl->tail->bi_next = bl2->head; | |
601 | else | |
602 | bl->head = bl2->head; | |
603 | ||
604 | bl->tail = bl2->tail; | |
605 | } | |
606 | ||
607 | static inline void bio_list_merge_head(struct bio_list *bl, | |
608 | struct bio_list *bl2) | |
609 | { | |
610 | if (!bl2->head) | |
611 | return; | |
612 | ||
613 | if (bl->head) | |
614 | bl2->tail->bi_next = bl->head; | |
615 | else | |
616 | bl->tail = bl2->tail; | |
617 | ||
618 | bl->head = bl2->head; | |
619 | } | |
620 | ||
13685a16 GU |
621 | static inline struct bio *bio_list_peek(struct bio_list *bl) |
622 | { | |
623 | return bl->head; | |
624 | } | |
625 | ||
8f3d8ba2 CH |
626 | static inline struct bio *bio_list_pop(struct bio_list *bl) |
627 | { | |
628 | struct bio *bio = bl->head; | |
629 | ||
630 | if (bio) { | |
631 | bl->head = bl->head->bi_next; | |
632 | if (!bl->head) | |
633 | bl->tail = NULL; | |
634 | ||
635 | bio->bi_next = NULL; | |
636 | } | |
637 | ||
638 | return bio; | |
639 | } | |
640 | ||
641 | static inline struct bio *bio_list_get(struct bio_list *bl) | |
642 | { | |
643 | struct bio *bio = bl->head; | |
644 | ||
645 | bl->head = bl->tail = NULL; | |
646 | ||
647 | return bio; | |
648 | } | |
649 | ||
0ef5a50c MS |
650 | /* |
651 | * Increment chain count for the bio. Make sure the CHAIN flag update | |
652 | * is visible before the raised count. | |
653 | */ | |
654 | static inline void bio_inc_remaining(struct bio *bio) | |
655 | { | |
656 | bio_set_flag(bio, BIO_CHAIN); | |
657 | smp_mb__before_atomic(); | |
658 | atomic_inc(&bio->__bi_remaining); | |
659 | } | |
660 | ||
57fb233f KO |
661 | /* |
662 | * bio_set is used to allow other portions of the IO system to | |
663 | * allocate their own private memory pools for bio and iovec structures. | |
664 | * These memory pools in turn all allocate from the bio_slab | |
665 | * and the bvec_slabs[]. | |
666 | */ | |
667 | #define BIO_POOL_SIZE 2 | |
668 | #define BIOVEC_NR_POOLS 6 | |
669 | #define BIOVEC_MAX_IDX (BIOVEC_NR_POOLS - 1) | |
670 | ||
671 | struct bio_set { | |
672 | struct kmem_cache *bio_slab; | |
673 | unsigned int front_pad; | |
674 | ||
675 | mempool_t *bio_pool; | |
9f060e22 | 676 | mempool_t *bvec_pool; |
57fb233f KO |
677 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
678 | mempool_t *bio_integrity_pool; | |
9f060e22 | 679 | mempool_t *bvec_integrity_pool; |
57fb233f | 680 | #endif |
df2cb6da KO |
681 | |
682 | /* | |
683 | * Deadlock avoidance for stacking block drivers: see comments in | |
684 | * bio_alloc_bioset() for details | |
685 | */ | |
686 | spinlock_t rescue_lock; | |
687 | struct bio_list rescue_list; | |
688 | struct work_struct rescue_work; | |
689 | struct workqueue_struct *rescue_workqueue; | |
57fb233f KO |
690 | }; |
691 | ||
692 | struct biovec_slab { | |
693 | int nr_vecs; | |
694 | char *name; | |
695 | struct kmem_cache *slab; | |
696 | }; | |
697 | ||
698 | /* | |
699 | * a small number of entries is fine, not going to be performance critical. | |
700 | * basically we just need to survive | |
701 | */ | |
702 | #define BIO_SPLIT_ENTRIES 2 | |
703 | ||
7ba1ba12 MP |
704 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
705 | ||
d57a5f7c KO |
706 | #define bip_for_each_vec(bvl, bip, iter) \ |
707 | for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter) | |
7ba1ba12 | 708 | |
13f05c8d MP |
709 | #define bio_for_each_integrity_vec(_bvl, _bio, _iter) \ |
710 | for_each_bio(_bio) \ | |
711 | bip_for_each_vec(_bvl, _bio->bi_integrity, _iter) | |
712 | ||
7ba1ba12 | 713 | extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int); |
1e2a410f | 714 | extern void bio_integrity_free(struct bio *); |
7ba1ba12 | 715 | extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int); |
e7258c1a | 716 | extern bool bio_integrity_enabled(struct bio *bio); |
7ba1ba12 | 717 | extern int bio_integrity_prep(struct bio *); |
4246a0b6 | 718 | extern void bio_integrity_endio(struct bio *); |
7ba1ba12 MP |
719 | extern void bio_integrity_advance(struct bio *, unsigned int); |
720 | extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int); | |
1e2a410f | 721 | extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t); |
7878cba9 MP |
722 | extern int bioset_integrity_create(struct bio_set *, int); |
723 | extern void bioset_integrity_free(struct bio_set *); | |
724 | extern void bio_integrity_init(void); | |
7ba1ba12 MP |
725 | |
726 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
727 | ||
c611529e | 728 | static inline void *bio_integrity(struct bio *bio) |
6898e3bd | 729 | { |
c611529e | 730 | return NULL; |
6898e3bd MP |
731 | } |
732 | ||
e7258c1a | 733 | static inline bool bio_integrity_enabled(struct bio *bio) |
6898e3bd | 734 | { |
e7258c1a | 735 | return false; |
6898e3bd MP |
736 | } |
737 | ||
738 | static inline int bioset_integrity_create(struct bio_set *bs, int pool_size) | |
739 | { | |
740 | return 0; | |
741 | } | |
742 | ||
743 | static inline void bioset_integrity_free (struct bio_set *bs) | |
744 | { | |
745 | return; | |
746 | } | |
747 | ||
748 | static inline int bio_integrity_prep(struct bio *bio) | |
749 | { | |
750 | return 0; | |
751 | } | |
752 | ||
1e2a410f | 753 | static inline void bio_integrity_free(struct bio *bio) |
6898e3bd MP |
754 | { |
755 | return; | |
756 | } | |
757 | ||
0c614e2d | 758 | static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
1e2a410f | 759 | gfp_t gfp_mask) |
0c614e2d SR |
760 | { |
761 | return 0; | |
762 | } | |
6898e3bd | 763 | |
6898e3bd MP |
764 | static inline void bio_integrity_advance(struct bio *bio, |
765 | unsigned int bytes_done) | |
766 | { | |
767 | return; | |
768 | } | |
769 | ||
770 | static inline void bio_integrity_trim(struct bio *bio, unsigned int offset, | |
771 | unsigned int sectors) | |
772 | { | |
773 | return; | |
774 | } | |
775 | ||
776 | static inline void bio_integrity_init(void) | |
777 | { | |
778 | return; | |
779 | } | |
7ba1ba12 | 780 | |
c611529e MP |
781 | static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag) |
782 | { | |
783 | return false; | |
784 | } | |
785 | ||
06c1e390 KB |
786 | static inline void *bio_integrity_alloc(struct bio * bio, gfp_t gfp, |
787 | unsigned int nr) | |
788 | { | |
789 | return ERR_PTR(-EINVAL); | |
790 | } | |
791 | ||
792 | static inline int bio_integrity_add_page(struct bio *bio, struct page *page, | |
793 | unsigned int len, unsigned int offset) | |
794 | { | |
795 | return 0; | |
796 | } | |
797 | ||
7ba1ba12 MP |
798 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
799 | ||
02a5e0ac | 800 | #endif /* CONFIG_BLOCK */ |
1da177e4 | 801 | #endif /* __LINUX_BIO_H */ |