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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 | */ | |
121 | #define bio_to_phys(bio) (page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio))) | |
122 | #define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset) | |
123 | ||
124 | /* | |
125 | * queues that have highmem support enabled may still need to revert to | |
126 | * PIO transfers occasionally and thus map high pages temporarily. For | |
127 | * permanent PIO fall back, user is probably better off disabling highmem | |
128 | * I/O completely on that queue (see ide-dma for example) | |
129 | */ | |
f619d254 KO |
130 | #define __bio_kmap_atomic(bio, iter) \ |
131 | (kmap_atomic(bio_iter_iovec((bio), (iter)).bv_page) + \ | |
132 | bio_iter_iovec((bio), (iter)).bv_offset) | |
1da177e4 | 133 | |
f619d254 | 134 | #define __bio_kunmap_atomic(addr) kunmap_atomic(addr) |
1da177e4 LT |
135 | |
136 | /* | |
137 | * merge helpers etc | |
138 | */ | |
139 | ||
f92131c3 JF |
140 | /* Default implementation of BIOVEC_PHYS_MERGEABLE */ |
141 | #define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ | |
142 | ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2))) | |
143 | ||
1da177e4 LT |
144 | /* |
145 | * allow arch override, for eg virtualized architectures (put in asm/io.h) | |
146 | */ | |
147 | #ifndef BIOVEC_PHYS_MERGEABLE | |
148 | #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ | |
f92131c3 | 149 | __BIOVEC_PHYS_MERGEABLE(vec1, vec2) |
1da177e4 LT |
150 | #endif |
151 | ||
1da177e4 LT |
152 | #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \ |
153 | (((addr1) | (mask)) == (((addr2) - 1) | (mask))) | |
154 | #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \ | |
ae03bf63 | 155 | __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q))) |
1da177e4 | 156 | |
d74c6d51 KO |
157 | /* |
158 | * drivers should _never_ use the all version - the bio may have been split | |
159 | * before it got to the driver and the driver won't own all of it | |
160 | */ | |
161 | #define bio_for_each_segment_all(bvl, bio, i) \ | |
f619d254 | 162 | for (i = 0, bvl = (bio)->bi_io_vec; i < (bio)->bi_vcnt; i++, bvl++) |
d74c6d51 | 163 | |
4550dd6c KO |
164 | static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter, |
165 | unsigned bytes) | |
166 | { | |
167 | iter->bi_sector += bytes >> 9; | |
168 | ||
95fe6c1a | 169 | if (bio_no_advance_iter(bio)) |
4550dd6c KO |
170 | iter->bi_size -= bytes; |
171 | else | |
172 | bvec_iter_advance(bio->bi_io_vec, iter, bytes); | |
173 | } | |
174 | ||
7988613b KO |
175 | #define __bio_for_each_segment(bvl, bio, iter, start) \ |
176 | for (iter = (start); \ | |
4550dd6c KO |
177 | (iter).bi_size && \ |
178 | ((bvl = bio_iter_iovec((bio), (iter))), 1); \ | |
179 | bio_advance_iter((bio), &(iter), (bvl).bv_len)) | |
7988613b KO |
180 | |
181 | #define bio_for_each_segment(bvl, bio, iter) \ | |
182 | __bio_for_each_segment(bvl, bio, iter, (bio)->bi_iter) | |
183 | ||
4550dd6c | 184 | #define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len) |
1da177e4 | 185 | |
458b76ed KO |
186 | static inline unsigned bio_segments(struct bio *bio) |
187 | { | |
188 | unsigned segs = 0; | |
189 | struct bio_vec bv; | |
190 | struct bvec_iter iter; | |
191 | ||
8423ae3d | 192 | /* |
a6f0788e CK |
193 | * We special case discard/write same/write zeroes, because they |
194 | * interpret bi_size differently: | |
8423ae3d KO |
195 | */ |
196 | ||
a6f0788e CK |
197 | switch (bio_op(bio)) { |
198 | case REQ_OP_DISCARD: | |
199 | case REQ_OP_SECURE_ERASE: | |
200 | case REQ_OP_WRITE_SAME: | |
201 | case REQ_OP_WRITE_ZEROES: | |
8423ae3d | 202 | return 1; |
a6f0788e CK |
203 | default: |
204 | break; | |
205 | } | |
8423ae3d | 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 | { | |
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 | ||
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 | ||
1e3914d4 CH |
410 | extern blk_qc_t submit_bio(struct bio *); |
411 | ||
4246a0b6 CH |
412 | extern void bio_endio(struct bio *); |
413 | ||
414 | static inline void bio_io_error(struct bio *bio) | |
415 | { | |
416 | bio->bi_error = -EIO; | |
417 | bio_endio(bio); | |
418 | } | |
419 | ||
1da177e4 LT |
420 | struct request_queue; |
421 | extern int bio_phys_segments(struct request_queue *, struct bio *); | |
1da177e4 | 422 | |
4e49ea4a | 423 | extern int submit_bio_wait(struct bio *bio); |
054bdf64 KO |
424 | extern void bio_advance(struct bio *, unsigned); |
425 | ||
3a83f467 ML |
426 | extern void bio_init(struct bio *bio, struct bio_vec *table, |
427 | unsigned short max_vecs); | |
f44b48c7 | 428 | extern void bio_reset(struct bio *); |
196d38bc | 429 | void bio_chain(struct bio *, struct bio *); |
1da177e4 LT |
430 | |
431 | extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int); | |
6e68af66 MC |
432 | extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *, |
433 | unsigned int, unsigned int); | |
2cefe4db | 434 | int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter); |
152e283f | 435 | struct rq_map_data; |
f1970baf | 436 | extern struct bio *bio_map_user_iov(struct request_queue *, |
26e49cfc | 437 | const struct iov_iter *, gfp_t); |
1da177e4 | 438 | extern void bio_unmap_user(struct bio *); |
df46b9a4 | 439 | extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int, |
27496a8c | 440 | gfp_t); |
68154e90 FT |
441 | extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int, |
442 | gfp_t, int); | |
1da177e4 LT |
443 | extern void bio_set_pages_dirty(struct bio *bio); |
444 | extern void bio_check_pages_dirty(struct bio *bio); | |
2d4dc890 | 445 | |
394ffa50 GZ |
446 | void generic_start_io_acct(int rw, unsigned long sectors, |
447 | struct hd_struct *part); | |
448 | void generic_end_io_acct(int rw, struct hd_struct *part, | |
449 | unsigned long start_time); | |
450 | ||
2d4dc890 IL |
451 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
452 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
453 | #endif | |
454 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
455 | extern void bio_flush_dcache_pages(struct bio *bi); | |
456 | #else | |
457 | static inline void bio_flush_dcache_pages(struct bio *bi) | |
458 | { | |
459 | } | |
460 | #endif | |
461 | ||
16ac3d63 | 462 | extern void bio_copy_data(struct bio *dst, struct bio *src); |
a0787606 | 463 | extern int bio_alloc_pages(struct bio *bio, gfp_t gfp); |
491221f8 | 464 | extern void bio_free_pages(struct bio *bio); |
16ac3d63 | 465 | |
152e283f | 466 | extern struct bio *bio_copy_user_iov(struct request_queue *, |
86d564c8 | 467 | struct rq_map_data *, |
26e49cfc KO |
468 | const struct iov_iter *, |
469 | gfp_t); | |
1da177e4 LT |
470 | extern int bio_uncopy_user(struct bio *); |
471 | void zero_fill_bio(struct bio *bio); | |
9f060e22 KO |
472 | extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *); |
473 | extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int); | |
7ba1ba12 | 474 | extern unsigned int bvec_nr_vecs(unsigned short idx); |
51d654e1 | 475 | |
852c788f | 476 | #ifdef CONFIG_BLK_CGROUP |
1d933cf0 | 477 | int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css); |
852c788f TH |
478 | int bio_associate_current(struct bio *bio); |
479 | void bio_disassociate_task(struct bio *bio); | |
20bd723e | 480 | void bio_clone_blkcg_association(struct bio *dst, struct bio *src); |
852c788f | 481 | #else /* CONFIG_BLK_CGROUP */ |
1d933cf0 TH |
482 | static inline int bio_associate_blkcg(struct bio *bio, |
483 | struct cgroup_subsys_state *blkcg_css) { return 0; } | |
852c788f TH |
484 | static inline int bio_associate_current(struct bio *bio) { return -ENOENT; } |
485 | static inline void bio_disassociate_task(struct bio *bio) { } | |
20bd723e PV |
486 | static inline void bio_clone_blkcg_association(struct bio *dst, |
487 | struct bio *src) { } | |
852c788f TH |
488 | #endif /* CONFIG_BLK_CGROUP */ |
489 | ||
1da177e4 LT |
490 | #ifdef CONFIG_HIGHMEM |
491 | /* | |
20b636bf AB |
492 | * remember never ever reenable interrupts between a bvec_kmap_irq and |
493 | * bvec_kunmap_irq! | |
1da177e4 | 494 | */ |
4f570f99 | 495 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
1da177e4 LT |
496 | { |
497 | unsigned long addr; | |
498 | ||
499 | /* | |
500 | * might not be a highmem page, but the preempt/irq count | |
501 | * balancing is a lot nicer this way | |
502 | */ | |
503 | local_irq_save(*flags); | |
e8e3c3d6 | 504 | addr = (unsigned long) kmap_atomic(bvec->bv_page); |
1da177e4 LT |
505 | |
506 | BUG_ON(addr & ~PAGE_MASK); | |
507 | ||
508 | return (char *) addr + bvec->bv_offset; | |
509 | } | |
510 | ||
4f570f99 | 511 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) |
1da177e4 LT |
512 | { |
513 | unsigned long ptr = (unsigned long) buffer & PAGE_MASK; | |
514 | ||
e8e3c3d6 | 515 | kunmap_atomic((void *) ptr); |
1da177e4 LT |
516 | local_irq_restore(*flags); |
517 | } | |
518 | ||
519 | #else | |
11a691be GU |
520 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
521 | { | |
522 | return page_address(bvec->bv_page) + bvec->bv_offset; | |
523 | } | |
524 | ||
525 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) | |
526 | { | |
527 | *flags = 0; | |
528 | } | |
1da177e4 LT |
529 | #endif |
530 | ||
f619d254 | 531 | static inline char *__bio_kmap_irq(struct bio *bio, struct bvec_iter iter, |
1da177e4 LT |
532 | unsigned long *flags) |
533 | { | |
f619d254 | 534 | return bvec_kmap_irq(&bio_iter_iovec(bio, iter), flags); |
1da177e4 LT |
535 | } |
536 | #define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags) | |
537 | ||
538 | #define bio_kmap_irq(bio, flags) \ | |
f619d254 | 539 | __bio_kmap_irq((bio), (bio)->bi_iter, (flags)) |
1da177e4 LT |
540 | #define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags) |
541 | ||
8f3d8ba2 | 542 | /* |
e686307f | 543 | * BIO list management for use by remapping drivers (e.g. DM or MD) and loop. |
8f3d8ba2 CH |
544 | * |
545 | * A bio_list anchors a singly-linked list of bios chained through the bi_next | |
546 | * member of the bio. The bio_list also caches the last list member to allow | |
547 | * fast access to the tail. | |
548 | */ | |
549 | struct bio_list { | |
550 | struct bio *head; | |
551 | struct bio *tail; | |
552 | }; | |
553 | ||
554 | static inline int bio_list_empty(const struct bio_list *bl) | |
555 | { | |
556 | return bl->head == NULL; | |
557 | } | |
558 | ||
559 | static inline void bio_list_init(struct bio_list *bl) | |
560 | { | |
561 | bl->head = bl->tail = NULL; | |
562 | } | |
563 | ||
320ae51f JA |
564 | #define BIO_EMPTY_LIST { NULL, NULL } |
565 | ||
8f3d8ba2 CH |
566 | #define bio_list_for_each(bio, bl) \ |
567 | for (bio = (bl)->head; bio; bio = bio->bi_next) | |
568 | ||
569 | static inline unsigned bio_list_size(const struct bio_list *bl) | |
570 | { | |
571 | unsigned sz = 0; | |
572 | struct bio *bio; | |
573 | ||
574 | bio_list_for_each(bio, bl) | |
575 | sz++; | |
576 | ||
577 | return sz; | |
578 | } | |
579 | ||
580 | static inline void bio_list_add(struct bio_list *bl, struct bio *bio) | |
581 | { | |
582 | bio->bi_next = NULL; | |
583 | ||
584 | if (bl->tail) | |
585 | bl->tail->bi_next = bio; | |
586 | else | |
587 | bl->head = bio; | |
588 | ||
589 | bl->tail = bio; | |
590 | } | |
591 | ||
592 | static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio) | |
593 | { | |
594 | bio->bi_next = bl->head; | |
595 | ||
596 | bl->head = bio; | |
597 | ||
598 | if (!bl->tail) | |
599 | bl->tail = bio; | |
600 | } | |
601 | ||
602 | static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2) | |
603 | { | |
604 | if (!bl2->head) | |
605 | return; | |
606 | ||
607 | if (bl->tail) | |
608 | bl->tail->bi_next = bl2->head; | |
609 | else | |
610 | bl->head = bl2->head; | |
611 | ||
612 | bl->tail = bl2->tail; | |
613 | } | |
614 | ||
615 | static inline void bio_list_merge_head(struct bio_list *bl, | |
616 | struct bio_list *bl2) | |
617 | { | |
618 | if (!bl2->head) | |
619 | return; | |
620 | ||
621 | if (bl->head) | |
622 | bl2->tail->bi_next = bl->head; | |
623 | else | |
624 | bl->tail = bl2->tail; | |
625 | ||
626 | bl->head = bl2->head; | |
627 | } | |
628 | ||
13685a16 GU |
629 | static inline struct bio *bio_list_peek(struct bio_list *bl) |
630 | { | |
631 | return bl->head; | |
632 | } | |
633 | ||
8f3d8ba2 CH |
634 | static inline struct bio *bio_list_pop(struct bio_list *bl) |
635 | { | |
636 | struct bio *bio = bl->head; | |
637 | ||
638 | if (bio) { | |
639 | bl->head = bl->head->bi_next; | |
640 | if (!bl->head) | |
641 | bl->tail = NULL; | |
642 | ||
643 | bio->bi_next = NULL; | |
644 | } | |
645 | ||
646 | return bio; | |
647 | } | |
648 | ||
649 | static inline struct bio *bio_list_get(struct bio_list *bl) | |
650 | { | |
651 | struct bio *bio = bl->head; | |
652 | ||
653 | bl->head = bl->tail = NULL; | |
654 | ||
655 | return bio; | |
656 | } | |
657 | ||
0ef5a50c MS |
658 | /* |
659 | * Increment chain count for the bio. Make sure the CHAIN flag update | |
660 | * is visible before the raised count. | |
661 | */ | |
662 | static inline void bio_inc_remaining(struct bio *bio) | |
663 | { | |
664 | bio_set_flag(bio, BIO_CHAIN); | |
665 | smp_mb__before_atomic(); | |
666 | atomic_inc(&bio->__bi_remaining); | |
667 | } | |
668 | ||
57fb233f KO |
669 | /* |
670 | * bio_set is used to allow other portions of the IO system to | |
671 | * allocate their own private memory pools for bio and iovec structures. | |
672 | * These memory pools in turn all allocate from the bio_slab | |
673 | * and the bvec_slabs[]. | |
674 | */ | |
675 | #define BIO_POOL_SIZE 2 | |
57fb233f KO |
676 | |
677 | struct bio_set { | |
678 | struct kmem_cache *bio_slab; | |
679 | unsigned int front_pad; | |
680 | ||
681 | mempool_t *bio_pool; | |
9f060e22 | 682 | mempool_t *bvec_pool; |
57fb233f KO |
683 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
684 | mempool_t *bio_integrity_pool; | |
9f060e22 | 685 | mempool_t *bvec_integrity_pool; |
57fb233f | 686 | #endif |
df2cb6da KO |
687 | |
688 | /* | |
689 | * Deadlock avoidance for stacking block drivers: see comments in | |
690 | * bio_alloc_bioset() for details | |
691 | */ | |
692 | spinlock_t rescue_lock; | |
693 | struct bio_list rescue_list; | |
694 | struct work_struct rescue_work; | |
695 | struct workqueue_struct *rescue_workqueue; | |
57fb233f KO |
696 | }; |
697 | ||
698 | struct biovec_slab { | |
699 | int nr_vecs; | |
700 | char *name; | |
701 | struct kmem_cache *slab; | |
702 | }; | |
703 | ||
704 | /* | |
705 | * a small number of entries is fine, not going to be performance critical. | |
706 | * basically we just need to survive | |
707 | */ | |
708 | #define BIO_SPLIT_ENTRIES 2 | |
709 | ||
7ba1ba12 MP |
710 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
711 | ||
d57a5f7c KO |
712 | #define bip_for_each_vec(bvl, bip, iter) \ |
713 | for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter) | |
7ba1ba12 | 714 | |
13f05c8d MP |
715 | #define bio_for_each_integrity_vec(_bvl, _bio, _iter) \ |
716 | for_each_bio(_bio) \ | |
717 | bip_for_each_vec(_bvl, _bio->bi_integrity, _iter) | |
718 | ||
7ba1ba12 | 719 | extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int); |
1e2a410f | 720 | extern void bio_integrity_free(struct bio *); |
7ba1ba12 | 721 | extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int); |
e7258c1a | 722 | extern bool bio_integrity_enabled(struct bio *bio); |
7ba1ba12 | 723 | extern int bio_integrity_prep(struct bio *); |
4246a0b6 | 724 | extern void bio_integrity_endio(struct bio *); |
7ba1ba12 MP |
725 | extern void bio_integrity_advance(struct bio *, unsigned int); |
726 | extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int); | |
1e2a410f | 727 | extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t); |
7878cba9 MP |
728 | extern int bioset_integrity_create(struct bio_set *, int); |
729 | extern void bioset_integrity_free(struct bio_set *); | |
730 | extern void bio_integrity_init(void); | |
7ba1ba12 MP |
731 | |
732 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
733 | ||
c611529e | 734 | static inline void *bio_integrity(struct bio *bio) |
6898e3bd | 735 | { |
c611529e | 736 | return NULL; |
6898e3bd MP |
737 | } |
738 | ||
e7258c1a | 739 | static inline bool bio_integrity_enabled(struct bio *bio) |
6898e3bd | 740 | { |
e7258c1a | 741 | return false; |
6898e3bd MP |
742 | } |
743 | ||
744 | static inline int bioset_integrity_create(struct bio_set *bs, int pool_size) | |
745 | { | |
746 | return 0; | |
747 | } | |
748 | ||
749 | static inline void bioset_integrity_free (struct bio_set *bs) | |
750 | { | |
751 | return; | |
752 | } | |
753 | ||
754 | static inline int bio_integrity_prep(struct bio *bio) | |
755 | { | |
756 | return 0; | |
757 | } | |
758 | ||
1e2a410f | 759 | static inline void bio_integrity_free(struct bio *bio) |
6898e3bd MP |
760 | { |
761 | return; | |
762 | } | |
763 | ||
0c614e2d | 764 | static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
1e2a410f | 765 | gfp_t gfp_mask) |
0c614e2d SR |
766 | { |
767 | return 0; | |
768 | } | |
6898e3bd | 769 | |
6898e3bd MP |
770 | static inline void bio_integrity_advance(struct bio *bio, |
771 | unsigned int bytes_done) | |
772 | { | |
773 | return; | |
774 | } | |
775 | ||
776 | static inline void bio_integrity_trim(struct bio *bio, unsigned int offset, | |
777 | unsigned int sectors) | |
778 | { | |
779 | return; | |
780 | } | |
781 | ||
782 | static inline void bio_integrity_init(void) | |
783 | { | |
784 | return; | |
785 | } | |
7ba1ba12 | 786 | |
c611529e MP |
787 | static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag) |
788 | { | |
789 | return false; | |
790 | } | |
791 | ||
06c1e390 KB |
792 | static inline void *bio_integrity_alloc(struct bio * bio, gfp_t gfp, |
793 | unsigned int nr) | |
794 | { | |
795 | return ERR_PTR(-EINVAL); | |
796 | } | |
797 | ||
798 | static inline int bio_integrity_add_page(struct bio *bio, struct page *page, | |
799 | unsigned int len, unsigned int offset) | |
800 | { | |
801 | return 0; | |
802 | } | |
803 | ||
7ba1ba12 MP |
804 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
805 | ||
02a5e0ac | 806 | #endif /* CONFIG_BLOCK */ |
1da177e4 | 807 | #endif /* __LINUX_BIO_H */ |