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Commit | Line | Data |
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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 | ||
d84a8477 | 41 | #define BIO_MAX_PAGES 256 |
1da177e4 | 42 | |
43b62ce3 MC |
43 | #define bio_prio(bio) (bio)->bi_ioprio |
44 | #define bio_set_prio(bio, prio) ((bio)->bi_ioprio = prio) | |
22e2c507 | 45 | |
4550dd6c KO |
46 | #define bio_iter_iovec(bio, iter) \ |
47 | bvec_iter_bvec((bio)->bi_io_vec, (iter)) | |
48 | ||
49 | #define bio_iter_page(bio, iter) \ | |
50 | bvec_iter_page((bio)->bi_io_vec, (iter)) | |
51 | #define bio_iter_len(bio, iter) \ | |
52 | bvec_iter_len((bio)->bi_io_vec, (iter)) | |
53 | #define bio_iter_offset(bio, iter) \ | |
54 | bvec_iter_offset((bio)->bi_io_vec, (iter)) | |
55 | ||
56 | #define bio_page(bio) bio_iter_page((bio), (bio)->bi_iter) | |
57 | #define bio_offset(bio) bio_iter_offset((bio), (bio)->bi_iter) | |
58 | #define bio_iovec(bio) bio_iter_iovec((bio), (bio)->bi_iter) | |
7988613b | 59 | |
458b76ed KO |
60 | #define bio_multiple_segments(bio) \ |
61 | ((bio)->bi_iter.bi_size != bio_iovec(bio).bv_len) | |
4f024f37 KO |
62 | #define bio_sectors(bio) ((bio)->bi_iter.bi_size >> 9) |
63 | #define bio_end_sector(bio) ((bio)->bi_iter.bi_sector + bio_sectors((bio))) | |
bf2de6f5 | 64 | |
d3849953 CH |
65 | /* |
66 | * Return the data direction, READ or WRITE. | |
67 | */ | |
68 | #define bio_data_dir(bio) \ | |
69 | (op_is_write(bio_op(bio)) ? WRITE : READ) | |
70 | ||
458b76ed KO |
71 | /* |
72 | * Check whether this bio carries any data or not. A NULL bio is allowed. | |
73 | */ | |
74 | static inline bool bio_has_data(struct bio *bio) | |
75 | { | |
76 | if (bio && | |
77 | bio->bi_iter.bi_size && | |
7afafc8a AH |
78 | bio_op(bio) != REQ_OP_DISCARD && |
79 | bio_op(bio) != REQ_OP_SECURE_ERASE) | |
458b76ed KO |
80 | return true; |
81 | ||
82 | return false; | |
83 | } | |
84 | ||
95fe6c1a MC |
85 | static inline bool bio_no_advance_iter(struct bio *bio) |
86 | { | |
7afafc8a AH |
87 | return bio_op(bio) == REQ_OP_DISCARD || |
88 | bio_op(bio) == REQ_OP_SECURE_ERASE || | |
89 | bio_op(bio) == REQ_OP_WRITE_SAME; | |
95fe6c1a MC |
90 | } |
91 | ||
458b76ed KO |
92 | static inline bool bio_mergeable(struct bio *bio) |
93 | { | |
1eff9d32 | 94 | if (bio->bi_opf & REQ_NOMERGE_FLAGS) |
458b76ed KO |
95 | return false; |
96 | ||
97 | return true; | |
98 | } | |
99 | ||
2e46e8b2 | 100 | static inline unsigned int bio_cur_bytes(struct bio *bio) |
bf2de6f5 | 101 | { |
458b76ed | 102 | if (bio_has_data(bio)) |
a4ad39b1 | 103 | return bio_iovec(bio).bv_len; |
fb2dce86 | 104 | else /* dataless requests such as discard */ |
4f024f37 | 105 | return bio->bi_iter.bi_size; |
bf2de6f5 JA |
106 | } |
107 | ||
108 | static inline void *bio_data(struct bio *bio) | |
109 | { | |
458b76ed | 110 | if (bio_has_data(bio)) |
bf2de6f5 JA |
111 | return page_address(bio_page(bio)) + bio_offset(bio); |
112 | ||
113 | return NULL; | |
114 | } | |
1da177e4 LT |
115 | |
116 | /* | |
117 | * will die | |
118 | */ | |
119 | #define bio_to_phys(bio) (page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio))) | |
120 | #define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset) | |
121 | ||
122 | /* | |
123 | * queues that have highmem support enabled may still need to revert to | |
124 | * PIO transfers occasionally and thus map high pages temporarily. For | |
125 | * permanent PIO fall back, user is probably better off disabling highmem | |
126 | * I/O completely on that queue (see ide-dma for example) | |
127 | */ | |
f619d254 KO |
128 | #define __bio_kmap_atomic(bio, iter) \ |
129 | (kmap_atomic(bio_iter_iovec((bio), (iter)).bv_page) + \ | |
130 | bio_iter_iovec((bio), (iter)).bv_offset) | |
1da177e4 | 131 | |
f619d254 | 132 | #define __bio_kunmap_atomic(addr) kunmap_atomic(addr) |
1da177e4 LT |
133 | |
134 | /* | |
135 | * merge helpers etc | |
136 | */ | |
137 | ||
f92131c3 JF |
138 | /* Default implementation of BIOVEC_PHYS_MERGEABLE */ |
139 | #define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ | |
140 | ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2))) | |
141 | ||
1da177e4 LT |
142 | /* |
143 | * allow arch override, for eg virtualized architectures (put in asm/io.h) | |
144 | */ | |
145 | #ifndef BIOVEC_PHYS_MERGEABLE | |
146 | #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ | |
f92131c3 | 147 | __BIOVEC_PHYS_MERGEABLE(vec1, vec2) |
1da177e4 LT |
148 | #endif |
149 | ||
1da177e4 LT |
150 | #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \ |
151 | (((addr1) | (mask)) == (((addr2) - 1) | (mask))) | |
152 | #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \ | |
ae03bf63 | 153 | __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q))) |
1da177e4 | 154 | |
d74c6d51 KO |
155 | /* |
156 | * drivers should _never_ use the all version - the bio may have been split | |
157 | * before it got to the driver and the driver won't own all of it | |
158 | */ | |
159 | #define bio_for_each_segment_all(bvl, bio, i) \ | |
f619d254 | 160 | for (i = 0, bvl = (bio)->bi_io_vec; i < (bio)->bi_vcnt; i++, bvl++) |
d74c6d51 | 161 | |
4550dd6c KO |
162 | static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter, |
163 | unsigned bytes) | |
164 | { | |
165 | iter->bi_sector += bytes >> 9; | |
166 | ||
95fe6c1a | 167 | if (bio_no_advance_iter(bio)) |
4550dd6c KO |
168 | iter->bi_size -= bytes; |
169 | else | |
170 | bvec_iter_advance(bio->bi_io_vec, iter, bytes); | |
171 | } | |
172 | ||
7988613b KO |
173 | #define __bio_for_each_segment(bvl, bio, iter, start) \ |
174 | for (iter = (start); \ | |
4550dd6c KO |
175 | (iter).bi_size && \ |
176 | ((bvl = bio_iter_iovec((bio), (iter))), 1); \ | |
177 | bio_advance_iter((bio), &(iter), (bvl).bv_len)) | |
7988613b KO |
178 | |
179 | #define bio_for_each_segment(bvl, bio, iter) \ | |
180 | __bio_for_each_segment(bvl, bio, iter, (bio)->bi_iter) | |
181 | ||
4550dd6c | 182 | #define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len) |
1da177e4 | 183 | |
458b76ed KO |
184 | static inline unsigned bio_segments(struct bio *bio) |
185 | { | |
186 | unsigned segs = 0; | |
187 | struct bio_vec bv; | |
188 | struct bvec_iter iter; | |
189 | ||
8423ae3d KO |
190 | /* |
191 | * We special case discard/write same, because they interpret bi_size | |
192 | * differently: | |
193 | */ | |
194 | ||
95fe6c1a | 195 | if (bio_op(bio) == REQ_OP_DISCARD) |
8423ae3d KO |
196 | return 1; |
197 | ||
7afafc8a AH |
198 | if (bio_op(bio) == REQ_OP_SECURE_ERASE) |
199 | return 1; | |
200 | ||
95fe6c1a | 201 | if (bio_op(bio) == REQ_OP_WRITE_SAME) |
8423ae3d KO |
202 | return 1; |
203 | ||
458b76ed KO |
204 | bio_for_each_segment(bv, bio, iter) |
205 | segs++; | |
206 | ||
207 | return segs; | |
208 | } | |
209 | ||
1da177e4 LT |
210 | /* |
211 | * get a reference to a bio, so it won't disappear. the intended use is | |
212 | * something like: | |
213 | * | |
214 | * bio_get(bio); | |
215 | * submit_bio(rw, bio); | |
216 | * if (bio->bi_flags ...) | |
217 | * do_something | |
218 | * bio_put(bio); | |
219 | * | |
220 | * without the bio_get(), it could potentially complete I/O before submit_bio | |
221 | * returns. and then bio would be freed memory when if (bio->bi_flags ...) | |
222 | * runs | |
223 | */ | |
dac56212 JA |
224 | static inline void bio_get(struct bio *bio) |
225 | { | |
226 | bio->bi_flags |= (1 << BIO_REFFED); | |
227 | smp_mb__before_atomic(); | |
228 | atomic_inc(&bio->__bi_cnt); | |
229 | } | |
230 | ||
231 | static inline void bio_cnt_set(struct bio *bio, unsigned int count) | |
232 | { | |
233 | if (count != 1) { | |
234 | bio->bi_flags |= (1 << BIO_REFFED); | |
235 | smp_mb__before_atomic(); | |
236 | } | |
237 | atomic_set(&bio->__bi_cnt, count); | |
238 | } | |
1da177e4 | 239 | |
b7c44ed9 JA |
240 | static inline bool bio_flagged(struct bio *bio, unsigned int bit) |
241 | { | |
2c68f6dc | 242 | return (bio->bi_flags & (1U << bit)) != 0; |
b7c44ed9 JA |
243 | } |
244 | ||
245 | static inline void bio_set_flag(struct bio *bio, unsigned int bit) | |
246 | { | |
2c68f6dc | 247 | bio->bi_flags |= (1U << bit); |
b7c44ed9 JA |
248 | } |
249 | ||
250 | static inline void bio_clear_flag(struct bio *bio, unsigned int bit) | |
251 | { | |
2c68f6dc | 252 | bio->bi_flags &= ~(1U << bit); |
b7c44ed9 JA |
253 | } |
254 | ||
7bcd79ac ML |
255 | static inline void bio_get_first_bvec(struct bio *bio, struct bio_vec *bv) |
256 | { | |
257 | *bv = bio_iovec(bio); | |
258 | } | |
259 | ||
260 | static inline void bio_get_last_bvec(struct bio *bio, struct bio_vec *bv) | |
261 | { | |
262 | struct bvec_iter iter = bio->bi_iter; | |
263 | int idx; | |
264 | ||
7bcd79ac ML |
265 | if (unlikely(!bio_multiple_segments(bio))) { |
266 | *bv = bio_iovec(bio); | |
267 | return; | |
268 | } | |
269 | ||
270 | bio_advance_iter(bio, &iter, iter.bi_size); | |
271 | ||
272 | if (!iter.bi_bvec_done) | |
273 | idx = iter.bi_idx - 1; | |
274 | else /* in the middle of bvec */ | |
275 | idx = iter.bi_idx; | |
276 | ||
277 | *bv = bio->bi_io_vec[idx]; | |
278 | ||
279 | /* | |
280 | * iter.bi_bvec_done records actual length of the last bvec | |
281 | * if this bio ends in the middle of one io vector | |
282 | */ | |
283 | if (iter.bi_bvec_done) | |
284 | bv->bv_len = iter.bi_bvec_done; | |
285 | } | |
286 | ||
c611529e MP |
287 | enum bip_flags { |
288 | BIP_BLOCK_INTEGRITY = 1 << 0, /* block layer owns integrity data */ | |
289 | BIP_MAPPED_INTEGRITY = 1 << 1, /* ref tag has been remapped */ | |
290 | BIP_CTRL_NOCHECK = 1 << 2, /* disable HBA integrity checking */ | |
291 | BIP_DISK_NOCHECK = 1 << 3, /* disable disk integrity checking */ | |
292 | BIP_IP_CHECKSUM = 1 << 4, /* IP checksum */ | |
293 | }; | |
294 | ||
7ba1ba12 MP |
295 | /* |
296 | * bio integrity payload | |
297 | */ | |
298 | struct bio_integrity_payload { | |
299 | struct bio *bip_bio; /* parent bio */ | |
7ba1ba12 | 300 | |
d57a5f7c | 301 | struct bvec_iter bip_iter; |
7ba1ba12 | 302 | |
d57a5f7c | 303 | bio_end_io_t *bip_end_io; /* saved I/O completion fn */ |
7ba1ba12 | 304 | |
7878cba9 | 305 | unsigned short bip_slab; /* slab the bip came from */ |
7ba1ba12 | 306 | unsigned short bip_vcnt; /* # of integrity bio_vecs */ |
cbcd1054 | 307 | unsigned short bip_max_vcnt; /* integrity bio_vec slots */ |
b1f01388 | 308 | unsigned short bip_flags; /* control flags */ |
7ba1ba12 MP |
309 | |
310 | struct work_struct bip_work; /* I/O completion */ | |
6fda981c KO |
311 | |
312 | struct bio_vec *bip_vec; | |
313 | struct bio_vec bip_inline_vecs[0];/* embedded bvec array */ | |
7ba1ba12 | 314 | }; |
18593088 | 315 | |
06c1e390 KB |
316 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
317 | ||
318 | static inline struct bio_integrity_payload *bio_integrity(struct bio *bio) | |
319 | { | |
1eff9d32 | 320 | if (bio->bi_opf & REQ_INTEGRITY) |
06c1e390 KB |
321 | return bio->bi_integrity; |
322 | ||
323 | return NULL; | |
324 | } | |
325 | ||
c611529e MP |
326 | static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag) |
327 | { | |
328 | struct bio_integrity_payload *bip = bio_integrity(bio); | |
329 | ||
330 | if (bip) | |
331 | return bip->bip_flags & flag; | |
332 | ||
333 | return false; | |
334 | } | |
b1f01388 | 335 | |
18593088 MP |
336 | static inline sector_t bip_get_seed(struct bio_integrity_payload *bip) |
337 | { | |
338 | return bip->bip_iter.bi_sector; | |
339 | } | |
340 | ||
341 | static inline void bip_set_seed(struct bio_integrity_payload *bip, | |
342 | sector_t seed) | |
343 | { | |
344 | bip->bip_iter.bi_sector = seed; | |
345 | } | |
346 | ||
7ba1ba12 | 347 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
1da177e4 | 348 | |
6678d83f | 349 | extern void bio_trim(struct bio *bio, int offset, int size); |
20d0189b KO |
350 | extern struct bio *bio_split(struct bio *bio, int sectors, |
351 | gfp_t gfp, struct bio_set *bs); | |
352 | ||
353 | /** | |
354 | * bio_next_split - get next @sectors from a bio, splitting if necessary | |
355 | * @bio: bio to split | |
356 | * @sectors: number of sectors to split from the front of @bio | |
357 | * @gfp: gfp mask | |
358 | * @bs: bio set to allocate from | |
359 | * | |
360 | * Returns a bio representing the next @sectors of @bio - if the bio is smaller | |
361 | * than @sectors, returns the original bio unchanged. | |
362 | */ | |
363 | static inline struct bio *bio_next_split(struct bio *bio, int sectors, | |
364 | gfp_t gfp, struct bio_set *bs) | |
365 | { | |
366 | if (sectors >= bio_sectors(bio)) | |
367 | return bio; | |
368 | ||
369 | return bio_split(bio, sectors, gfp, bs); | |
370 | } | |
371 | ||
bb799ca0 | 372 | extern struct bio_set *bioset_create(unsigned int, unsigned int); |
d8f429e1 | 373 | extern struct bio_set *bioset_create_nobvec(unsigned int, unsigned int); |
1da177e4 | 374 | extern void bioset_free(struct bio_set *); |
a6c39cb4 | 375 | extern mempool_t *biovec_create_pool(int pool_entries); |
1da177e4 | 376 | |
dd0fc66f | 377 | extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *); |
1da177e4 LT |
378 | extern void bio_put(struct bio *); |
379 | ||
59d276fe KO |
380 | extern void __bio_clone_fast(struct bio *, struct bio *); |
381 | extern struct bio *bio_clone_fast(struct bio *, gfp_t, struct bio_set *); | |
bf800ef1 KO |
382 | extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs); |
383 | ||
3f86a82a KO |
384 | extern struct bio_set *fs_bio_set; |
385 | ||
386 | static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) | |
387 | { | |
388 | return bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set); | |
389 | } | |
390 | ||
bf800ef1 KO |
391 | static inline struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask) |
392 | { | |
393 | return bio_clone_bioset(bio, gfp_mask, fs_bio_set); | |
394 | } | |
395 | ||
3f86a82a KO |
396 | static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs) |
397 | { | |
398 | return bio_alloc_bioset(gfp_mask, nr_iovecs, NULL); | |
399 | } | |
400 | ||
bf800ef1 KO |
401 | static inline struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask) |
402 | { | |
403 | return bio_clone_bioset(bio, gfp_mask, NULL); | |
404 | ||
405 | } | |
406 | ||
1e3914d4 CH |
407 | extern blk_qc_t submit_bio(struct bio *); |
408 | ||
4246a0b6 CH |
409 | extern void bio_endio(struct bio *); |
410 | ||
411 | static inline void bio_io_error(struct bio *bio) | |
412 | { | |
413 | bio->bi_error = -EIO; | |
414 | bio_endio(bio); | |
415 | } | |
416 | ||
1da177e4 LT |
417 | struct request_queue; |
418 | extern int bio_phys_segments(struct request_queue *, struct bio *); | |
1da177e4 | 419 | |
4e49ea4a | 420 | extern int submit_bio_wait(struct bio *bio); |
054bdf64 KO |
421 | extern void bio_advance(struct bio *, unsigned); |
422 | ||
1da177e4 | 423 | extern void bio_init(struct bio *); |
f44b48c7 | 424 | extern void bio_reset(struct bio *); |
196d38bc | 425 | void bio_chain(struct bio *, struct bio *); |
1da177e4 LT |
426 | |
427 | extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int); | |
6e68af66 MC |
428 | extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *, |
429 | unsigned int, unsigned int); | |
2cefe4db | 430 | int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter); |
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); |
491221f8 | 460 | extern void bio_free_pages(struct bio *bio); |
16ac3d63 | 461 | |
152e283f | 462 | extern struct bio *bio_copy_user_iov(struct request_queue *, |
86d564c8 | 463 | struct rq_map_data *, |
26e49cfc KO |
464 | const struct iov_iter *, |
465 | gfp_t); | |
1da177e4 LT |
466 | extern int bio_uncopy_user(struct bio *); |
467 | void zero_fill_bio(struct bio *bio); | |
9f060e22 KO |
468 | extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *); |
469 | extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int); | |
7ba1ba12 | 470 | extern unsigned int bvec_nr_vecs(unsigned short idx); |
51d654e1 | 471 | |
852c788f | 472 | #ifdef CONFIG_BLK_CGROUP |
1d933cf0 | 473 | int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css); |
852c788f TH |
474 | int bio_associate_current(struct bio *bio); |
475 | void bio_disassociate_task(struct bio *bio); | |
20bd723e | 476 | void bio_clone_blkcg_association(struct bio *dst, struct bio *src); |
852c788f | 477 | #else /* CONFIG_BLK_CGROUP */ |
1d933cf0 TH |
478 | static inline int bio_associate_blkcg(struct bio *bio, |
479 | struct cgroup_subsys_state *blkcg_css) { return 0; } | |
852c788f TH |
480 | static inline int bio_associate_current(struct bio *bio) { return -ENOENT; } |
481 | static inline void bio_disassociate_task(struct bio *bio) { } | |
20bd723e PV |
482 | static inline void bio_clone_blkcg_association(struct bio *dst, |
483 | struct bio *src) { } | |
852c788f TH |
484 | #endif /* CONFIG_BLK_CGROUP */ |
485 | ||
1da177e4 LT |
486 | #ifdef CONFIG_HIGHMEM |
487 | /* | |
20b636bf AB |
488 | * remember never ever reenable interrupts between a bvec_kmap_irq and |
489 | * bvec_kunmap_irq! | |
1da177e4 | 490 | */ |
4f570f99 | 491 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
1da177e4 LT |
492 | { |
493 | unsigned long addr; | |
494 | ||
495 | /* | |
496 | * might not be a highmem page, but the preempt/irq count | |
497 | * balancing is a lot nicer this way | |
498 | */ | |
499 | local_irq_save(*flags); | |
e8e3c3d6 | 500 | addr = (unsigned long) kmap_atomic(bvec->bv_page); |
1da177e4 LT |
501 | |
502 | BUG_ON(addr & ~PAGE_MASK); | |
503 | ||
504 | return (char *) addr + bvec->bv_offset; | |
505 | } | |
506 | ||
4f570f99 | 507 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) |
1da177e4 LT |
508 | { |
509 | unsigned long ptr = (unsigned long) buffer & PAGE_MASK; | |
510 | ||
e8e3c3d6 | 511 | kunmap_atomic((void *) ptr); |
1da177e4 LT |
512 | local_irq_restore(*flags); |
513 | } | |
514 | ||
515 | #else | |
11a691be GU |
516 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
517 | { | |
518 | return page_address(bvec->bv_page) + bvec->bv_offset; | |
519 | } | |
520 | ||
521 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) | |
522 | { | |
523 | *flags = 0; | |
524 | } | |
1da177e4 LT |
525 | #endif |
526 | ||
f619d254 | 527 | static inline char *__bio_kmap_irq(struct bio *bio, struct bvec_iter iter, |
1da177e4 LT |
528 | unsigned long *flags) |
529 | { | |
f619d254 | 530 | return bvec_kmap_irq(&bio_iter_iovec(bio, iter), flags); |
1da177e4 LT |
531 | } |
532 | #define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags) | |
533 | ||
534 | #define bio_kmap_irq(bio, flags) \ | |
f619d254 | 535 | __bio_kmap_irq((bio), (bio)->bi_iter, (flags)) |
1da177e4 LT |
536 | #define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags) |
537 | ||
8f3d8ba2 | 538 | /* |
e686307f | 539 | * BIO list management for use by remapping drivers (e.g. DM or MD) and loop. |
8f3d8ba2 CH |
540 | * |
541 | * A bio_list anchors a singly-linked list of bios chained through the bi_next | |
542 | * member of the bio. The bio_list also caches the last list member to allow | |
543 | * fast access to the tail. | |
544 | */ | |
545 | struct bio_list { | |
546 | struct bio *head; | |
547 | struct bio *tail; | |
548 | }; | |
549 | ||
550 | static inline int bio_list_empty(const struct bio_list *bl) | |
551 | { | |
552 | return bl->head == NULL; | |
553 | } | |
554 | ||
555 | static inline void bio_list_init(struct bio_list *bl) | |
556 | { | |
557 | bl->head = bl->tail = NULL; | |
558 | } | |
559 | ||
320ae51f JA |
560 | #define BIO_EMPTY_LIST { NULL, NULL } |
561 | ||
8f3d8ba2 CH |
562 | #define bio_list_for_each(bio, bl) \ |
563 | for (bio = (bl)->head; bio; bio = bio->bi_next) | |
564 | ||
565 | static inline unsigned bio_list_size(const struct bio_list *bl) | |
566 | { | |
567 | unsigned sz = 0; | |
568 | struct bio *bio; | |
569 | ||
570 | bio_list_for_each(bio, bl) | |
571 | sz++; | |
572 | ||
573 | return sz; | |
574 | } | |
575 | ||
576 | static inline void bio_list_add(struct bio_list *bl, struct bio *bio) | |
577 | { | |
578 | bio->bi_next = NULL; | |
579 | ||
580 | if (bl->tail) | |
581 | bl->tail->bi_next = bio; | |
582 | else | |
583 | bl->head = bio; | |
584 | ||
585 | bl->tail = bio; | |
586 | } | |
587 | ||
588 | static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio) | |
589 | { | |
590 | bio->bi_next = bl->head; | |
591 | ||
592 | bl->head = bio; | |
593 | ||
594 | if (!bl->tail) | |
595 | bl->tail = bio; | |
596 | } | |
597 | ||
598 | static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2) | |
599 | { | |
600 | if (!bl2->head) | |
601 | return; | |
602 | ||
603 | if (bl->tail) | |
604 | bl->tail->bi_next = bl2->head; | |
605 | else | |
606 | bl->head = bl2->head; | |
607 | ||
608 | bl->tail = bl2->tail; | |
609 | } | |
610 | ||
611 | static inline void bio_list_merge_head(struct bio_list *bl, | |
612 | struct bio_list *bl2) | |
613 | { | |
614 | if (!bl2->head) | |
615 | return; | |
616 | ||
617 | if (bl->head) | |
618 | bl2->tail->bi_next = bl->head; | |
619 | else | |
620 | bl->tail = bl2->tail; | |
621 | ||
622 | bl->head = bl2->head; | |
623 | } | |
624 | ||
13685a16 GU |
625 | static inline struct bio *bio_list_peek(struct bio_list *bl) |
626 | { | |
627 | return bl->head; | |
628 | } | |
629 | ||
8f3d8ba2 CH |
630 | static inline struct bio *bio_list_pop(struct bio_list *bl) |
631 | { | |
632 | struct bio *bio = bl->head; | |
633 | ||
634 | if (bio) { | |
635 | bl->head = bl->head->bi_next; | |
636 | if (!bl->head) | |
637 | bl->tail = NULL; | |
638 | ||
639 | bio->bi_next = NULL; | |
640 | } | |
641 | ||
642 | return bio; | |
643 | } | |
644 | ||
645 | static inline struct bio *bio_list_get(struct bio_list *bl) | |
646 | { | |
647 | struct bio *bio = bl->head; | |
648 | ||
649 | bl->head = bl->tail = NULL; | |
650 | ||
651 | return bio; | |
652 | } | |
653 | ||
0ef5a50c MS |
654 | /* |
655 | * Increment chain count for the bio. Make sure the CHAIN flag update | |
656 | * is visible before the raised count. | |
657 | */ | |
658 | static inline void bio_inc_remaining(struct bio *bio) | |
659 | { | |
660 | bio_set_flag(bio, BIO_CHAIN); | |
661 | smp_mb__before_atomic(); | |
662 | atomic_inc(&bio->__bi_remaining); | |
663 | } | |
664 | ||
57fb233f KO |
665 | /* |
666 | * bio_set is used to allow other portions of the IO system to | |
667 | * allocate their own private memory pools for bio and iovec structures. | |
668 | * These memory pools in turn all allocate from the bio_slab | |
669 | * and the bvec_slabs[]. | |
670 | */ | |
671 | #define BIO_POOL_SIZE 2 | |
57fb233f KO |
672 | |
673 | struct bio_set { | |
674 | struct kmem_cache *bio_slab; | |
675 | unsigned int front_pad; | |
676 | ||
677 | mempool_t *bio_pool; | |
9f060e22 | 678 | mempool_t *bvec_pool; |
57fb233f KO |
679 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
680 | mempool_t *bio_integrity_pool; | |
9f060e22 | 681 | mempool_t *bvec_integrity_pool; |
57fb233f | 682 | #endif |
df2cb6da KO |
683 | |
684 | /* | |
685 | * Deadlock avoidance for stacking block drivers: see comments in | |
686 | * bio_alloc_bioset() for details | |
687 | */ | |
688 | spinlock_t rescue_lock; | |
689 | struct bio_list rescue_list; | |
690 | struct work_struct rescue_work; | |
691 | struct workqueue_struct *rescue_workqueue; | |
57fb233f KO |
692 | }; |
693 | ||
694 | struct biovec_slab { | |
695 | int nr_vecs; | |
696 | char *name; | |
697 | struct kmem_cache *slab; | |
698 | }; | |
699 | ||
700 | /* | |
701 | * a small number of entries is fine, not going to be performance critical. | |
702 | * basically we just need to survive | |
703 | */ | |
704 | #define BIO_SPLIT_ENTRIES 2 | |
705 | ||
7ba1ba12 MP |
706 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
707 | ||
d57a5f7c KO |
708 | #define bip_for_each_vec(bvl, bip, iter) \ |
709 | for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter) | |
7ba1ba12 | 710 | |
13f05c8d MP |
711 | #define bio_for_each_integrity_vec(_bvl, _bio, _iter) \ |
712 | for_each_bio(_bio) \ | |
713 | bip_for_each_vec(_bvl, _bio->bi_integrity, _iter) | |
714 | ||
7ba1ba12 | 715 | extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int); |
1e2a410f | 716 | extern void bio_integrity_free(struct bio *); |
7ba1ba12 | 717 | extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int); |
e7258c1a | 718 | extern bool bio_integrity_enabled(struct bio *bio); |
7ba1ba12 | 719 | extern int bio_integrity_prep(struct bio *); |
4246a0b6 | 720 | extern void bio_integrity_endio(struct bio *); |
7ba1ba12 MP |
721 | extern void bio_integrity_advance(struct bio *, unsigned int); |
722 | extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int); | |
1e2a410f | 723 | extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t); |
7878cba9 MP |
724 | extern int bioset_integrity_create(struct bio_set *, int); |
725 | extern void bioset_integrity_free(struct bio_set *); | |
726 | extern void bio_integrity_init(void); | |
7ba1ba12 MP |
727 | |
728 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
729 | ||
c611529e | 730 | static inline void *bio_integrity(struct bio *bio) |
6898e3bd | 731 | { |
c611529e | 732 | return NULL; |
6898e3bd MP |
733 | } |
734 | ||
e7258c1a | 735 | static inline bool bio_integrity_enabled(struct bio *bio) |
6898e3bd | 736 | { |
e7258c1a | 737 | return false; |
6898e3bd MP |
738 | } |
739 | ||
740 | static inline int bioset_integrity_create(struct bio_set *bs, int pool_size) | |
741 | { | |
742 | return 0; | |
743 | } | |
744 | ||
745 | static inline void bioset_integrity_free (struct bio_set *bs) | |
746 | { | |
747 | return; | |
748 | } | |
749 | ||
750 | static inline int bio_integrity_prep(struct bio *bio) | |
751 | { | |
752 | return 0; | |
753 | } | |
754 | ||
1e2a410f | 755 | static inline void bio_integrity_free(struct bio *bio) |
6898e3bd MP |
756 | { |
757 | return; | |
758 | } | |
759 | ||
0c614e2d | 760 | static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
1e2a410f | 761 | gfp_t gfp_mask) |
0c614e2d SR |
762 | { |
763 | return 0; | |
764 | } | |
6898e3bd | 765 | |
6898e3bd MP |
766 | static inline void bio_integrity_advance(struct bio *bio, |
767 | unsigned int bytes_done) | |
768 | { | |
769 | return; | |
770 | } | |
771 | ||
772 | static inline void bio_integrity_trim(struct bio *bio, unsigned int offset, | |
773 | unsigned int sectors) | |
774 | { | |
775 | return; | |
776 | } | |
777 | ||
778 | static inline void bio_integrity_init(void) | |
779 | { | |
780 | return; | |
781 | } | |
7ba1ba12 | 782 | |
c611529e MP |
783 | static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag) |
784 | { | |
785 | return false; | |
786 | } | |
787 | ||
06c1e390 KB |
788 | static inline void *bio_integrity_alloc(struct bio * bio, gfp_t gfp, |
789 | unsigned int nr) | |
790 | { | |
791 | return ERR_PTR(-EINVAL); | |
792 | } | |
793 | ||
794 | static inline int bio_integrity_add_page(struct bio *bio, struct page *page, | |
795 | unsigned int len, unsigned int offset) | |
796 | { | |
797 | return 0; | |
798 | } | |
799 | ||
7ba1ba12 MP |
800 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
801 | ||
02a5e0ac | 802 | #endif /* CONFIG_BLOCK */ |
1da177e4 | 803 | #endif /* __LINUX_BIO_H */ |