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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 | 78 | bio_op(bio) != REQ_OP_DISCARD && |
a6f0788e CK |
79 | bio_op(bio) != REQ_OP_SECURE_ERASE && |
80 | bio_op(bio) != REQ_OP_WRITE_ZEROES) | |
458b76ed KO |
81 | return true; |
82 | ||
83 | return false; | |
84 | } | |
85 | ||
95fe6c1a MC |
86 | static inline bool bio_no_advance_iter(struct bio *bio) |
87 | { | |
7afafc8a AH |
88 | return bio_op(bio) == REQ_OP_DISCARD || |
89 | bio_op(bio) == REQ_OP_SECURE_ERASE || | |
a6f0788e CK |
90 | bio_op(bio) == REQ_OP_WRITE_SAME || |
91 | bio_op(bio) == REQ_OP_WRITE_ZEROES; | |
95fe6c1a MC |
92 | } |
93 | ||
458b76ed KO |
94 | static inline bool bio_mergeable(struct bio *bio) |
95 | { | |
1eff9d32 | 96 | if (bio->bi_opf & REQ_NOMERGE_FLAGS) |
458b76ed KO |
97 | return false; |
98 | ||
99 | return true; | |
100 | } | |
101 | ||
2e46e8b2 | 102 | static inline unsigned int bio_cur_bytes(struct bio *bio) |
bf2de6f5 | 103 | { |
458b76ed | 104 | if (bio_has_data(bio)) |
a4ad39b1 | 105 | return bio_iovec(bio).bv_len; |
fb2dce86 | 106 | else /* dataless requests such as discard */ |
4f024f37 | 107 | return bio->bi_iter.bi_size; |
bf2de6f5 JA |
108 | } |
109 | ||
110 | static inline void *bio_data(struct bio *bio) | |
111 | { | |
458b76ed | 112 | if (bio_has_data(bio)) |
bf2de6f5 JA |
113 | return page_address(bio_page(bio)) + bio_offset(bio); |
114 | ||
115 | return NULL; | |
116 | } | |
1da177e4 LT |
117 | |
118 | /* | |
119 | * will die | |
120 | */ | |
1da177e4 LT |
121 | #define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset) |
122 | ||
123 | /* | |
124 | * queues that have highmem support enabled may still need to revert to | |
125 | * PIO transfers occasionally and thus map high pages temporarily. For | |
126 | * permanent PIO fall back, user is probably better off disabling highmem | |
127 | * I/O completely on that queue (see ide-dma for example) | |
128 | */ | |
f619d254 KO |
129 | #define __bio_kmap_atomic(bio, iter) \ |
130 | (kmap_atomic(bio_iter_iovec((bio), (iter)).bv_page) + \ | |
131 | bio_iter_iovec((bio), (iter)).bv_offset) | |
1da177e4 | 132 | |
f619d254 | 133 | #define __bio_kunmap_atomic(addr) kunmap_atomic(addr) |
1da177e4 LT |
134 | |
135 | /* | |
136 | * merge helpers etc | |
137 | */ | |
138 | ||
f92131c3 JF |
139 | /* Default implementation of BIOVEC_PHYS_MERGEABLE */ |
140 | #define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ | |
141 | ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2))) | |
142 | ||
1da177e4 LT |
143 | /* |
144 | * allow arch override, for eg virtualized architectures (put in asm/io.h) | |
145 | */ | |
146 | #ifndef BIOVEC_PHYS_MERGEABLE | |
147 | #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ | |
f92131c3 | 148 | __BIOVEC_PHYS_MERGEABLE(vec1, vec2) |
1da177e4 LT |
149 | #endif |
150 | ||
1da177e4 LT |
151 | #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \ |
152 | (((addr1) | (mask)) == (((addr2) - 1) | (mask))) | |
153 | #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \ | |
ae03bf63 | 154 | __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q))) |
1da177e4 | 155 | |
d74c6d51 KO |
156 | /* |
157 | * drivers should _never_ use the all version - the bio may have been split | |
158 | * before it got to the driver and the driver won't own all of it | |
159 | */ | |
160 | #define bio_for_each_segment_all(bvl, bio, i) \ | |
f619d254 | 161 | for (i = 0, bvl = (bio)->bi_io_vec; i < (bio)->bi_vcnt; i++, bvl++) |
d74c6d51 | 162 | |
4550dd6c KO |
163 | static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter, |
164 | unsigned bytes) | |
165 | { | |
166 | iter->bi_sector += bytes >> 9; | |
167 | ||
95fe6c1a | 168 | if (bio_no_advance_iter(bio)) |
4550dd6c KO |
169 | iter->bi_size -= bytes; |
170 | else | |
171 | bvec_iter_advance(bio->bi_io_vec, iter, bytes); | |
172 | } | |
173 | ||
7988613b KO |
174 | #define __bio_for_each_segment(bvl, bio, iter, start) \ |
175 | for (iter = (start); \ | |
4550dd6c KO |
176 | (iter).bi_size && \ |
177 | ((bvl = bio_iter_iovec((bio), (iter))), 1); \ | |
178 | bio_advance_iter((bio), &(iter), (bvl).bv_len)) | |
7988613b KO |
179 | |
180 | #define bio_for_each_segment(bvl, bio, iter) \ | |
181 | __bio_for_each_segment(bvl, bio, iter, (bio)->bi_iter) | |
182 | ||
4550dd6c | 183 | #define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len) |
1da177e4 | 184 | |
f4595875 | 185 | static inline unsigned bio_segments(struct bio *bio) |
458b76ed KO |
186 | { |
187 | unsigned segs = 0; | |
188 | struct bio_vec bv; | |
189 | struct bvec_iter iter; | |
190 | ||
8423ae3d | 191 | /* |
a6f0788e CK |
192 | * We special case discard/write same/write zeroes, because they |
193 | * interpret bi_size differently: | |
8423ae3d KO |
194 | */ |
195 | ||
a6f0788e CK |
196 | switch (bio_op(bio)) { |
197 | case REQ_OP_DISCARD: | |
198 | case REQ_OP_SECURE_ERASE: | |
a6f0788e | 199 | case REQ_OP_WRITE_ZEROES: |
f9d03f96 CH |
200 | return 0; |
201 | case REQ_OP_WRITE_SAME: | |
8423ae3d | 202 | return 1; |
a6f0788e CK |
203 | default: |
204 | break; | |
205 | } | |
8423ae3d | 206 | |
f4595875 | 207 | bio_for_each_segment(bv, bio, iter) |
458b76ed KO |
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 | { | |
1eff9d32 | 323 | if (bio->bi_opf & REQ_INTEGRITY) |
06c1e390 KB |
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 | ||
011067b0 N |
375 | extern struct bio_set *bioset_create(unsigned int, unsigned int, int flags); |
376 | enum { | |
377 | BIOSET_NEED_BVECS = BIT(0), | |
47e0fb46 | 378 | BIOSET_NEED_RESCUER = BIT(1), |
011067b0 | 379 | }; |
1da177e4 | 380 | extern void bioset_free(struct bio_set *); |
a6c39cb4 | 381 | extern mempool_t *biovec_create_pool(int pool_entries); |
1da177e4 | 382 | |
7a88fa19 | 383 | extern struct bio *bio_alloc_bioset(gfp_t, unsigned int, struct bio_set *); |
1da177e4 LT |
384 | extern void bio_put(struct bio *); |
385 | ||
59d276fe KO |
386 | extern void __bio_clone_fast(struct bio *, struct bio *); |
387 | extern struct bio *bio_clone_fast(struct bio *, gfp_t, struct bio_set *); | |
bf800ef1 KO |
388 | extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs); |
389 | ||
3f86a82a KO |
390 | extern struct bio_set *fs_bio_set; |
391 | ||
392 | static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) | |
393 | { | |
394 | return bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set); | |
395 | } | |
396 | ||
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 | ||
1e3914d4 CH |
408 | extern blk_qc_t submit_bio(struct bio *); |
409 | ||
4246a0b6 CH |
410 | extern void bio_endio(struct bio *); |
411 | ||
412 | static inline void bio_io_error(struct bio *bio) | |
413 | { | |
4e4cbee9 | 414 | bio->bi_status = BLK_STS_IOERR; |
4246a0b6 CH |
415 | bio_endio(bio); |
416 | } | |
417 | ||
03a07c92 GR |
418 | static inline void bio_wouldblock_error(struct bio *bio) |
419 | { | |
420 | bio->bi_status = BLK_STS_AGAIN; | |
4246a0b6 CH |
421 | bio_endio(bio); |
422 | } | |
423 | ||
1da177e4 LT |
424 | struct request_queue; |
425 | extern int bio_phys_segments(struct request_queue *, struct bio *); | |
1da177e4 | 426 | |
4e49ea4a | 427 | extern int submit_bio_wait(struct bio *bio); |
054bdf64 KO |
428 | extern void bio_advance(struct bio *, unsigned); |
429 | ||
3a83f467 ML |
430 | extern void bio_init(struct bio *bio, struct bio_vec *table, |
431 | unsigned short max_vecs); | |
9ae3b3f5 | 432 | extern void bio_uninit(struct bio *); |
f44b48c7 | 433 | extern void bio_reset(struct bio *); |
196d38bc | 434 | void bio_chain(struct bio *, struct bio *); |
1da177e4 LT |
435 | |
436 | extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int); | |
6e68af66 MC |
437 | extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *, |
438 | unsigned int, unsigned int); | |
2cefe4db | 439 | int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter); |
152e283f | 440 | struct rq_map_data; |
f1970baf | 441 | extern struct bio *bio_map_user_iov(struct request_queue *, |
26e49cfc | 442 | const struct iov_iter *, gfp_t); |
1da177e4 | 443 | extern void bio_unmap_user(struct bio *); |
df46b9a4 | 444 | extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int, |
27496a8c | 445 | gfp_t); |
68154e90 FT |
446 | extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int, |
447 | gfp_t, int); | |
1da177e4 LT |
448 | extern void bio_set_pages_dirty(struct bio *bio); |
449 | extern void bio_check_pages_dirty(struct bio *bio); | |
2d4dc890 | 450 | |
394ffa50 GZ |
451 | void generic_start_io_acct(int rw, unsigned long sectors, |
452 | struct hd_struct *part); | |
453 | void generic_end_io_acct(int rw, struct hd_struct *part, | |
454 | unsigned long start_time); | |
455 | ||
2d4dc890 IL |
456 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
457 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
458 | #endif | |
459 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
460 | extern void bio_flush_dcache_pages(struct bio *bi); | |
461 | #else | |
462 | static inline void bio_flush_dcache_pages(struct bio *bi) | |
463 | { | |
464 | } | |
465 | #endif | |
466 | ||
16ac3d63 | 467 | extern void bio_copy_data(struct bio *dst, struct bio *src); |
a0787606 | 468 | extern int bio_alloc_pages(struct bio *bio, gfp_t gfp); |
491221f8 | 469 | extern void bio_free_pages(struct bio *bio); |
16ac3d63 | 470 | |
152e283f | 471 | extern struct bio *bio_copy_user_iov(struct request_queue *, |
86d564c8 | 472 | struct rq_map_data *, |
26e49cfc KO |
473 | const struct iov_iter *, |
474 | gfp_t); | |
1da177e4 LT |
475 | extern int bio_uncopy_user(struct bio *); |
476 | void zero_fill_bio(struct bio *bio); | |
9f060e22 KO |
477 | extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *); |
478 | extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int); | |
7ba1ba12 | 479 | extern unsigned int bvec_nr_vecs(unsigned short idx); |
51d654e1 | 480 | |
852c788f | 481 | #ifdef CONFIG_BLK_CGROUP |
1d933cf0 | 482 | int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css); |
852c788f TH |
483 | int bio_associate_current(struct bio *bio); |
484 | void bio_disassociate_task(struct bio *bio); | |
20bd723e | 485 | void bio_clone_blkcg_association(struct bio *dst, struct bio *src); |
852c788f | 486 | #else /* CONFIG_BLK_CGROUP */ |
1d933cf0 TH |
487 | static inline int bio_associate_blkcg(struct bio *bio, |
488 | struct cgroup_subsys_state *blkcg_css) { return 0; } | |
852c788f TH |
489 | static inline int bio_associate_current(struct bio *bio) { return -ENOENT; } |
490 | static inline void bio_disassociate_task(struct bio *bio) { } | |
20bd723e PV |
491 | static inline void bio_clone_blkcg_association(struct bio *dst, |
492 | struct bio *src) { } | |
852c788f TH |
493 | #endif /* CONFIG_BLK_CGROUP */ |
494 | ||
1da177e4 LT |
495 | #ifdef CONFIG_HIGHMEM |
496 | /* | |
20b636bf AB |
497 | * remember never ever reenable interrupts between a bvec_kmap_irq and |
498 | * bvec_kunmap_irq! | |
1da177e4 | 499 | */ |
4f570f99 | 500 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
1da177e4 LT |
501 | { |
502 | unsigned long addr; | |
503 | ||
504 | /* | |
505 | * might not be a highmem page, but the preempt/irq count | |
506 | * balancing is a lot nicer this way | |
507 | */ | |
508 | local_irq_save(*flags); | |
e8e3c3d6 | 509 | addr = (unsigned long) kmap_atomic(bvec->bv_page); |
1da177e4 LT |
510 | |
511 | BUG_ON(addr & ~PAGE_MASK); | |
512 | ||
513 | return (char *) addr + bvec->bv_offset; | |
514 | } | |
515 | ||
4f570f99 | 516 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) |
1da177e4 LT |
517 | { |
518 | unsigned long ptr = (unsigned long) buffer & PAGE_MASK; | |
519 | ||
e8e3c3d6 | 520 | kunmap_atomic((void *) ptr); |
1da177e4 LT |
521 | local_irq_restore(*flags); |
522 | } | |
523 | ||
524 | #else | |
11a691be GU |
525 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
526 | { | |
527 | return page_address(bvec->bv_page) + bvec->bv_offset; | |
528 | } | |
529 | ||
530 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) | |
531 | { | |
532 | *flags = 0; | |
533 | } | |
1da177e4 LT |
534 | #endif |
535 | ||
f619d254 | 536 | static inline char *__bio_kmap_irq(struct bio *bio, struct bvec_iter iter, |
1da177e4 LT |
537 | unsigned long *flags) |
538 | { | |
f619d254 | 539 | return bvec_kmap_irq(&bio_iter_iovec(bio, iter), flags); |
1da177e4 LT |
540 | } |
541 | #define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags) | |
542 | ||
543 | #define bio_kmap_irq(bio, flags) \ | |
f619d254 | 544 | __bio_kmap_irq((bio), (bio)->bi_iter, (flags)) |
1da177e4 LT |
545 | #define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags) |
546 | ||
8f3d8ba2 | 547 | /* |
e686307f | 548 | * BIO list management for use by remapping drivers (e.g. DM or MD) and loop. |
8f3d8ba2 CH |
549 | * |
550 | * A bio_list anchors a singly-linked list of bios chained through the bi_next | |
551 | * member of the bio. The bio_list also caches the last list member to allow | |
552 | * fast access to the tail. | |
553 | */ | |
554 | struct bio_list { | |
555 | struct bio *head; | |
556 | struct bio *tail; | |
557 | }; | |
558 | ||
559 | static inline int bio_list_empty(const struct bio_list *bl) | |
560 | { | |
561 | return bl->head == NULL; | |
562 | } | |
563 | ||
564 | static inline void bio_list_init(struct bio_list *bl) | |
565 | { | |
566 | bl->head = bl->tail = NULL; | |
567 | } | |
568 | ||
320ae51f JA |
569 | #define BIO_EMPTY_LIST { NULL, NULL } |
570 | ||
8f3d8ba2 CH |
571 | #define bio_list_for_each(bio, bl) \ |
572 | for (bio = (bl)->head; bio; bio = bio->bi_next) | |
573 | ||
574 | static inline unsigned bio_list_size(const struct bio_list *bl) | |
575 | { | |
576 | unsigned sz = 0; | |
577 | struct bio *bio; | |
578 | ||
579 | bio_list_for_each(bio, bl) | |
580 | sz++; | |
581 | ||
582 | return sz; | |
583 | } | |
584 | ||
585 | static inline void bio_list_add(struct bio_list *bl, struct bio *bio) | |
586 | { | |
587 | bio->bi_next = NULL; | |
588 | ||
589 | if (bl->tail) | |
590 | bl->tail->bi_next = bio; | |
591 | else | |
592 | bl->head = bio; | |
593 | ||
594 | bl->tail = bio; | |
595 | } | |
596 | ||
597 | static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio) | |
598 | { | |
599 | bio->bi_next = bl->head; | |
600 | ||
601 | bl->head = bio; | |
602 | ||
603 | if (!bl->tail) | |
604 | bl->tail = bio; | |
605 | } | |
606 | ||
607 | static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2) | |
608 | { | |
609 | if (!bl2->head) | |
610 | return; | |
611 | ||
612 | if (bl->tail) | |
613 | bl->tail->bi_next = bl2->head; | |
614 | else | |
615 | bl->head = bl2->head; | |
616 | ||
617 | bl->tail = bl2->tail; | |
618 | } | |
619 | ||
620 | static inline void bio_list_merge_head(struct bio_list *bl, | |
621 | struct bio_list *bl2) | |
622 | { | |
623 | if (!bl2->head) | |
624 | return; | |
625 | ||
626 | if (bl->head) | |
627 | bl2->tail->bi_next = bl->head; | |
628 | else | |
629 | bl->tail = bl2->tail; | |
630 | ||
631 | bl->head = bl2->head; | |
632 | } | |
633 | ||
13685a16 GU |
634 | static inline struct bio *bio_list_peek(struct bio_list *bl) |
635 | { | |
636 | return bl->head; | |
637 | } | |
638 | ||
8f3d8ba2 CH |
639 | static inline struct bio *bio_list_pop(struct bio_list *bl) |
640 | { | |
641 | struct bio *bio = bl->head; | |
642 | ||
643 | if (bio) { | |
644 | bl->head = bl->head->bi_next; | |
645 | if (!bl->head) | |
646 | bl->tail = NULL; | |
647 | ||
648 | bio->bi_next = NULL; | |
649 | } | |
650 | ||
651 | return bio; | |
652 | } | |
653 | ||
654 | static inline struct bio *bio_list_get(struct bio_list *bl) | |
655 | { | |
656 | struct bio *bio = bl->head; | |
657 | ||
658 | bl->head = bl->tail = NULL; | |
659 | ||
660 | return bio; | |
661 | } | |
662 | ||
0ef5a50c MS |
663 | /* |
664 | * Increment chain count for the bio. Make sure the CHAIN flag update | |
665 | * is visible before the raised count. | |
666 | */ | |
667 | static inline void bio_inc_remaining(struct bio *bio) | |
668 | { | |
669 | bio_set_flag(bio, BIO_CHAIN); | |
670 | smp_mb__before_atomic(); | |
671 | atomic_inc(&bio->__bi_remaining); | |
672 | } | |
673 | ||
57fb233f KO |
674 | /* |
675 | * bio_set is used to allow other portions of the IO system to | |
676 | * allocate their own private memory pools for bio and iovec structures. | |
677 | * These memory pools in turn all allocate from the bio_slab | |
678 | * and the bvec_slabs[]. | |
679 | */ | |
680 | #define BIO_POOL_SIZE 2 | |
57fb233f KO |
681 | |
682 | struct bio_set { | |
683 | struct kmem_cache *bio_slab; | |
684 | unsigned int front_pad; | |
685 | ||
686 | mempool_t *bio_pool; | |
9f060e22 | 687 | mempool_t *bvec_pool; |
57fb233f KO |
688 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
689 | mempool_t *bio_integrity_pool; | |
9f060e22 | 690 | mempool_t *bvec_integrity_pool; |
57fb233f | 691 | #endif |
df2cb6da KO |
692 | |
693 | /* | |
694 | * Deadlock avoidance for stacking block drivers: see comments in | |
695 | * bio_alloc_bioset() for details | |
696 | */ | |
697 | spinlock_t rescue_lock; | |
698 | struct bio_list rescue_list; | |
699 | struct work_struct rescue_work; | |
700 | struct workqueue_struct *rescue_workqueue; | |
57fb233f KO |
701 | }; |
702 | ||
703 | struct biovec_slab { | |
704 | int nr_vecs; | |
705 | char *name; | |
706 | struct kmem_cache *slab; | |
707 | }; | |
708 | ||
709 | /* | |
710 | * a small number of entries is fine, not going to be performance critical. | |
711 | * basically we just need to survive | |
712 | */ | |
713 | #define BIO_SPLIT_ENTRIES 2 | |
714 | ||
7ba1ba12 MP |
715 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
716 | ||
d57a5f7c KO |
717 | #define bip_for_each_vec(bvl, bip, iter) \ |
718 | for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter) | |
7ba1ba12 | 719 | |
13f05c8d MP |
720 | #define bio_for_each_integrity_vec(_bvl, _bio, _iter) \ |
721 | for_each_bio(_bio) \ | |
722 | bip_for_each_vec(_bvl, _bio->bi_integrity, _iter) | |
723 | ||
7ba1ba12 | 724 | extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int); |
1e2a410f | 725 | extern void bio_integrity_free(struct bio *); |
7ba1ba12 | 726 | extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int); |
e23947bd | 727 | extern bool bio_integrity_prep(struct bio *); |
4246a0b6 | 728 | extern void bio_integrity_endio(struct bio *); |
7ba1ba12 | 729 | extern void bio_integrity_advance(struct bio *, unsigned int); |
fbd08e76 | 730 | extern void bio_integrity_trim(struct bio *); |
1e2a410f | 731 | extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t); |
7878cba9 MP |
732 | extern int bioset_integrity_create(struct bio_set *, int); |
733 | extern void bioset_integrity_free(struct bio_set *); | |
734 | extern void bio_integrity_init(void); | |
7ba1ba12 MP |
735 | |
736 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
737 | ||
c611529e | 738 | static inline void *bio_integrity(struct bio *bio) |
6898e3bd | 739 | { |
c611529e | 740 | return NULL; |
6898e3bd MP |
741 | } |
742 | ||
6898e3bd MP |
743 | static inline int bioset_integrity_create(struct bio_set *bs, int pool_size) |
744 | { | |
745 | return 0; | |
746 | } | |
747 | ||
748 | static inline void bioset_integrity_free (struct bio_set *bs) | |
749 | { | |
750 | return; | |
751 | } | |
752 | ||
e23947bd | 753 | static inline bool bio_integrity_prep(struct bio *bio) |
6898e3bd | 754 | { |
e23947bd | 755 | return true; |
6898e3bd MP |
756 | } |
757 | ||
1e2a410f | 758 | static inline void bio_integrity_free(struct bio *bio) |
6898e3bd MP |
759 | { |
760 | return; | |
761 | } | |
762 | ||
0c614e2d | 763 | static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
1e2a410f | 764 | gfp_t gfp_mask) |
0c614e2d SR |
765 | { |
766 | return 0; | |
767 | } | |
6898e3bd | 768 | |
6898e3bd MP |
769 | static inline void bio_integrity_advance(struct bio *bio, |
770 | unsigned int bytes_done) | |
771 | { | |
772 | return; | |
773 | } | |
774 | ||
fbd08e76 | 775 | static inline void bio_integrity_trim(struct bio *bio) |
6898e3bd MP |
776 | { |
777 | return; | |
778 | } | |
779 | ||
780 | static inline void bio_integrity_init(void) | |
781 | { | |
782 | return; | |
783 | } | |
7ba1ba12 | 784 | |
c611529e MP |
785 | static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag) |
786 | { | |
787 | return false; | |
788 | } | |
789 | ||
06c1e390 KB |
790 | static inline void *bio_integrity_alloc(struct bio * bio, gfp_t gfp, |
791 | unsigned int nr) | |
792 | { | |
793 | return ERR_PTR(-EINVAL); | |
794 | } | |
795 | ||
796 | static inline int bio_integrity_add_page(struct bio *bio, struct page *page, | |
797 | unsigned int len, unsigned int offset) | |
798 | { | |
799 | return 0; | |
800 | } | |
801 | ||
7ba1ba12 MP |
802 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
803 | ||
02a5e0ac | 804 | #endif /* CONFIG_BLOCK */ |
1da177e4 | 805 | #endif /* __LINUX_BIO_H */ |