Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * 2.5 block I/O model | |
3 | * | |
4 | * Copyright (C) 2001 Jens Axboe <axboe@suse.de> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
7cc01581 | 12 | * |
1da177e4 LT |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public Licens | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111- | |
19 | */ | |
20 | #ifndef __LINUX_BIO_H | |
21 | #define __LINUX_BIO_H | |
22 | ||
23 | #include <linux/highmem.h> | |
24 | #include <linux/mempool.h> | |
22e2c507 | 25 | #include <linux/ioprio.h> |
187f1882 | 26 | #include <linux/bug.h> |
1da177e4 | 27 | |
02a5e0ac DH |
28 | #ifdef CONFIG_BLOCK |
29 | ||
1da177e4 LT |
30 | #include <asm/io.h> |
31 | ||
7cc01581 TH |
32 | /* struct bio, bio_vec and BIO_* flags are defined in blk_types.h */ |
33 | #include <linux/blk_types.h> | |
34 | ||
1da177e4 LT |
35 | #define BIO_DEBUG |
36 | ||
37 | #ifdef BIO_DEBUG | |
38 | #define BIO_BUG_ON BUG_ON | |
39 | #else | |
40 | #define BIO_BUG_ON | |
41 | #endif | |
42 | ||
d84a8477 | 43 | #define BIO_MAX_PAGES 256 |
1da177e4 LT |
44 | #define BIO_MAX_SIZE (BIO_MAX_PAGES << PAGE_CACHE_SHIFT) |
45 | #define BIO_MAX_SECTORS (BIO_MAX_SIZE >> 9) | |
46 | ||
22e2c507 JA |
47 | /* |
48 | * upper 16 bits of bi_rw define the io priority of this bio | |
49 | */ | |
50 | #define BIO_PRIO_SHIFT (8 * sizeof(unsigned long) - IOPRIO_BITS) | |
51 | #define bio_prio(bio) ((bio)->bi_rw >> BIO_PRIO_SHIFT) | |
52 | #define bio_prio_valid(bio) ioprio_valid(bio_prio(bio)) | |
53 | ||
54 | #define bio_set_prio(bio, prio) do { \ | |
55 | WARN_ON(prio >= (1 << IOPRIO_BITS)); \ | |
56 | (bio)->bi_rw &= ((1UL << BIO_PRIO_SHIFT) - 1); \ | |
57 | (bio)->bi_rw |= ((unsigned long) (prio) << BIO_PRIO_SHIFT); \ | |
58 | } while (0) | |
59 | ||
1da177e4 LT |
60 | /* |
61 | * various member access, note that bio_data should of course not be used | |
62 | * on highmem page vectors | |
63 | */ | |
4550dd6c | 64 | #define __bvec_iter_bvec(bvec, iter) (&(bvec)[(iter).bi_idx]) |
a4ad39b1 | 65 | |
4550dd6c KO |
66 | #define bvec_iter_page(bvec, iter) \ |
67 | (__bvec_iter_bvec((bvec), (iter))->bv_page) | |
68 | ||
69 | #define bvec_iter_len(bvec, iter) \ | |
70 | min((iter).bi_size, \ | |
71 | __bvec_iter_bvec((bvec), (iter))->bv_len - (iter).bi_bvec_done) | |
72 | ||
73 | #define bvec_iter_offset(bvec, iter) \ | |
74 | (__bvec_iter_bvec((bvec), (iter))->bv_offset + (iter).bi_bvec_done) | |
75 | ||
76 | #define bvec_iter_bvec(bvec, iter) \ | |
77 | ((struct bio_vec) { \ | |
78 | .bv_page = bvec_iter_page((bvec), (iter)), \ | |
79 | .bv_len = bvec_iter_len((bvec), (iter)), \ | |
80 | .bv_offset = bvec_iter_offset((bvec), (iter)), \ | |
81 | }) | |
82 | ||
83 | #define bio_iter_iovec(bio, iter) \ | |
84 | bvec_iter_bvec((bio)->bi_io_vec, (iter)) | |
85 | ||
86 | #define bio_iter_page(bio, iter) \ | |
87 | bvec_iter_page((bio)->bi_io_vec, (iter)) | |
88 | #define bio_iter_len(bio, iter) \ | |
89 | bvec_iter_len((bio)->bi_io_vec, (iter)) | |
90 | #define bio_iter_offset(bio, iter) \ | |
91 | bvec_iter_offset((bio)->bi_io_vec, (iter)) | |
92 | ||
93 | #define bio_page(bio) bio_iter_page((bio), (bio)->bi_iter) | |
94 | #define bio_offset(bio) bio_iter_offset((bio), (bio)->bi_iter) | |
95 | #define bio_iovec(bio) bio_iter_iovec((bio), (bio)->bi_iter) | |
7988613b | 96 | |
458b76ed KO |
97 | #define bio_multiple_segments(bio) \ |
98 | ((bio)->bi_iter.bi_size != bio_iovec(bio).bv_len) | |
4f024f37 KO |
99 | #define bio_sectors(bio) ((bio)->bi_iter.bi_size >> 9) |
100 | #define bio_end_sector(bio) ((bio)->bi_iter.bi_sector + bio_sectors((bio))) | |
bf2de6f5 | 101 | |
458b76ed KO |
102 | /* |
103 | * Check whether this bio carries any data or not. A NULL bio is allowed. | |
104 | */ | |
105 | static inline bool bio_has_data(struct bio *bio) | |
106 | { | |
107 | if (bio && | |
108 | bio->bi_iter.bi_size && | |
109 | !(bio->bi_rw & REQ_DISCARD)) | |
110 | return true; | |
111 | ||
112 | return false; | |
113 | } | |
114 | ||
115 | static inline bool bio_is_rw(struct bio *bio) | |
116 | { | |
117 | if (!bio_has_data(bio)) | |
118 | return false; | |
119 | ||
120 | if (bio->bi_rw & BIO_NO_ADVANCE_ITER_MASK) | |
121 | return false; | |
122 | ||
123 | return true; | |
124 | } | |
125 | ||
126 | static inline bool bio_mergeable(struct bio *bio) | |
127 | { | |
128 | if (bio->bi_rw & REQ_NOMERGE_FLAGS) | |
129 | return false; | |
130 | ||
131 | return true; | |
132 | } | |
133 | ||
2e46e8b2 | 134 | static inline unsigned int bio_cur_bytes(struct bio *bio) |
bf2de6f5 | 135 | { |
458b76ed | 136 | if (bio_has_data(bio)) |
a4ad39b1 | 137 | return bio_iovec(bio).bv_len; |
fb2dce86 | 138 | else /* dataless requests such as discard */ |
4f024f37 | 139 | return bio->bi_iter.bi_size; |
bf2de6f5 JA |
140 | } |
141 | ||
142 | static inline void *bio_data(struct bio *bio) | |
143 | { | |
458b76ed | 144 | if (bio_has_data(bio)) |
bf2de6f5 JA |
145 | return page_address(bio_page(bio)) + bio_offset(bio); |
146 | ||
147 | return NULL; | |
148 | } | |
1da177e4 LT |
149 | |
150 | /* | |
151 | * will die | |
152 | */ | |
153 | #define bio_to_phys(bio) (page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio))) | |
154 | #define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset) | |
155 | ||
156 | /* | |
157 | * queues that have highmem support enabled may still need to revert to | |
158 | * PIO transfers occasionally and thus map high pages temporarily. For | |
159 | * permanent PIO fall back, user is probably better off disabling highmem | |
160 | * I/O completely on that queue (see ide-dma for example) | |
161 | */ | |
f619d254 KO |
162 | #define __bio_kmap_atomic(bio, iter) \ |
163 | (kmap_atomic(bio_iter_iovec((bio), (iter)).bv_page) + \ | |
164 | bio_iter_iovec((bio), (iter)).bv_offset) | |
1da177e4 | 165 | |
f619d254 | 166 | #define __bio_kunmap_atomic(addr) kunmap_atomic(addr) |
1da177e4 LT |
167 | |
168 | /* | |
169 | * merge helpers etc | |
170 | */ | |
171 | ||
f92131c3 JF |
172 | /* Default implementation of BIOVEC_PHYS_MERGEABLE */ |
173 | #define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ | |
174 | ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2))) | |
175 | ||
1da177e4 LT |
176 | /* |
177 | * allow arch override, for eg virtualized architectures (put in asm/io.h) | |
178 | */ | |
179 | #ifndef BIOVEC_PHYS_MERGEABLE | |
180 | #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ | |
f92131c3 | 181 | __BIOVEC_PHYS_MERGEABLE(vec1, vec2) |
1da177e4 LT |
182 | #endif |
183 | ||
1da177e4 LT |
184 | #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \ |
185 | (((addr1) | (mask)) == (((addr2) - 1) | (mask))) | |
186 | #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \ | |
ae03bf63 | 187 | __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q))) |
1da177e4 | 188 | |
66cb45aa JA |
189 | /* |
190 | * Check if adding a bio_vec after bprv with offset would create a gap in | |
191 | * the SG list. Most drivers don't care about this, but some do. | |
192 | */ | |
193 | static inline bool bvec_gap_to_prev(struct bio_vec *bprv, unsigned int offset) | |
194 | { | |
195 | return offset || ((bprv->bv_offset + bprv->bv_len) & (PAGE_SIZE - 1)); | |
196 | } | |
197 | ||
6712ecf8 | 198 | #define bio_io_error(bio) bio_endio((bio), -EIO) |
1da177e4 | 199 | |
d74c6d51 KO |
200 | /* |
201 | * drivers should _never_ use the all version - the bio may have been split | |
202 | * before it got to the driver and the driver won't own all of it | |
203 | */ | |
204 | #define bio_for_each_segment_all(bvl, bio, i) \ | |
f619d254 | 205 | for (i = 0, bvl = (bio)->bi_io_vec; i < (bio)->bi_vcnt; i++, bvl++) |
d74c6d51 | 206 | |
4550dd6c KO |
207 | static inline void bvec_iter_advance(struct bio_vec *bv, struct bvec_iter *iter, |
208 | unsigned bytes) | |
209 | { | |
210 | WARN_ONCE(bytes > iter->bi_size, | |
211 | "Attempted to advance past end of bvec iter\n"); | |
212 | ||
213 | while (bytes) { | |
214 | unsigned len = min(bytes, bvec_iter_len(bv, *iter)); | |
215 | ||
216 | bytes -= len; | |
217 | iter->bi_size -= len; | |
218 | iter->bi_bvec_done += len; | |
219 | ||
220 | if (iter->bi_bvec_done == __bvec_iter_bvec(bv, *iter)->bv_len) { | |
221 | iter->bi_bvec_done = 0; | |
222 | iter->bi_idx++; | |
223 | } | |
224 | } | |
225 | } | |
226 | ||
227 | #define for_each_bvec(bvl, bio_vec, iter, start) \ | |
b7aa84d9 MP |
228 | for (iter = (start); \ |
229 | (iter).bi_size && \ | |
230 | ((bvl = bvec_iter_bvec((bio_vec), (iter))), 1); \ | |
4550dd6c KO |
231 | bvec_iter_advance((bio_vec), &(iter), (bvl).bv_len)) |
232 | ||
233 | ||
234 | static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter, | |
235 | unsigned bytes) | |
236 | { | |
237 | iter->bi_sector += bytes >> 9; | |
238 | ||
239 | if (bio->bi_rw & BIO_NO_ADVANCE_ITER_MASK) | |
240 | iter->bi_size -= bytes; | |
241 | else | |
242 | bvec_iter_advance(bio->bi_io_vec, iter, bytes); | |
243 | } | |
244 | ||
7988613b KO |
245 | #define __bio_for_each_segment(bvl, bio, iter, start) \ |
246 | for (iter = (start); \ | |
4550dd6c KO |
247 | (iter).bi_size && \ |
248 | ((bvl = bio_iter_iovec((bio), (iter))), 1); \ | |
249 | bio_advance_iter((bio), &(iter), (bvl).bv_len)) | |
7988613b KO |
250 | |
251 | #define bio_for_each_segment(bvl, bio, iter) \ | |
252 | __bio_for_each_segment(bvl, bio, iter, (bio)->bi_iter) | |
253 | ||
4550dd6c | 254 | #define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len) |
1da177e4 | 255 | |
458b76ed KO |
256 | static inline unsigned bio_segments(struct bio *bio) |
257 | { | |
258 | unsigned segs = 0; | |
259 | struct bio_vec bv; | |
260 | struct bvec_iter iter; | |
261 | ||
8423ae3d KO |
262 | /* |
263 | * We special case discard/write same, because they interpret bi_size | |
264 | * differently: | |
265 | */ | |
266 | ||
267 | if (bio->bi_rw & REQ_DISCARD) | |
268 | return 1; | |
269 | ||
270 | if (bio->bi_rw & REQ_WRITE_SAME) | |
271 | return 1; | |
272 | ||
458b76ed KO |
273 | bio_for_each_segment(bv, bio, iter) |
274 | segs++; | |
275 | ||
276 | return segs; | |
277 | } | |
278 | ||
1da177e4 LT |
279 | /* |
280 | * get a reference to a bio, so it won't disappear. the intended use is | |
281 | * something like: | |
282 | * | |
283 | * bio_get(bio); | |
284 | * submit_bio(rw, bio); | |
285 | * if (bio->bi_flags ...) | |
286 | * do_something | |
287 | * bio_put(bio); | |
288 | * | |
289 | * without the bio_get(), it could potentially complete I/O before submit_bio | |
290 | * returns. and then bio would be freed memory when if (bio->bi_flags ...) | |
291 | * runs | |
292 | */ | |
293 | #define bio_get(bio) atomic_inc(&(bio)->bi_cnt) | |
294 | ||
7ba1ba12 MP |
295 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
296 | /* | |
297 | * bio integrity payload | |
298 | */ | |
299 | struct bio_integrity_payload { | |
300 | struct bio *bip_bio; /* parent bio */ | |
7ba1ba12 | 301 | |
d57a5f7c | 302 | struct bvec_iter bip_iter; |
7ba1ba12 | 303 | |
d57a5f7c | 304 | /* kill - should just use bip_vec */ |
7ba1ba12 | 305 | void *bip_buf; /* generated integrity data */ |
7ba1ba12 | 306 | |
d57a5f7c | 307 | bio_end_io_t *bip_end_io; /* saved I/O completion fn */ |
7ba1ba12 | 308 | |
7878cba9 | 309 | unsigned short bip_slab; /* slab the bip came from */ |
7ba1ba12 | 310 | unsigned short bip_vcnt; /* # of integrity bio_vecs */ |
cbcd1054 | 311 | unsigned short bip_max_vcnt; /* integrity bio_vec slots */ |
29ed7813 | 312 | unsigned bip_owns_buf:1; /* should free bip_buf */ |
7ba1ba12 MP |
313 | |
314 | struct work_struct bip_work; /* I/O completion */ | |
6fda981c KO |
315 | |
316 | struct bio_vec *bip_vec; | |
317 | struct bio_vec bip_inline_vecs[0];/* embedded bvec array */ | |
7ba1ba12 MP |
318 | }; |
319 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1da177e4 | 320 | |
6678d83f | 321 | extern void bio_trim(struct bio *bio, int offset, int size); |
20d0189b KO |
322 | extern struct bio *bio_split(struct bio *bio, int sectors, |
323 | gfp_t gfp, struct bio_set *bs); | |
324 | ||
325 | /** | |
326 | * bio_next_split - get next @sectors from a bio, splitting if necessary | |
327 | * @bio: bio to split | |
328 | * @sectors: number of sectors to split from the front of @bio | |
329 | * @gfp: gfp mask | |
330 | * @bs: bio set to allocate from | |
331 | * | |
332 | * Returns a bio representing the next @sectors of @bio - if the bio is smaller | |
333 | * than @sectors, returns the original bio unchanged. | |
334 | */ | |
335 | static inline struct bio *bio_next_split(struct bio *bio, int sectors, | |
336 | gfp_t gfp, struct bio_set *bs) | |
337 | { | |
338 | if (sectors >= bio_sectors(bio)) | |
339 | return bio; | |
340 | ||
341 | return bio_split(bio, sectors, gfp, bs); | |
342 | } | |
343 | ||
bb799ca0 | 344 | extern struct bio_set *bioset_create(unsigned int, unsigned int); |
1da177e4 | 345 | extern void bioset_free(struct bio_set *); |
a6c39cb4 | 346 | extern mempool_t *biovec_create_pool(int pool_entries); |
1da177e4 | 347 | |
dd0fc66f | 348 | extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *); |
1da177e4 LT |
349 | extern void bio_put(struct bio *); |
350 | ||
59d276fe KO |
351 | extern void __bio_clone_fast(struct bio *, struct bio *); |
352 | extern struct bio *bio_clone_fast(struct bio *, gfp_t, struct bio_set *); | |
bf800ef1 KO |
353 | extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs); |
354 | ||
3f86a82a | 355 | extern struct bio_set *fs_bio_set; |
c4540a7d | 356 | unsigned int bio_integrity_tag_size(struct bio *bio); |
3f86a82a KO |
357 | |
358 | static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) | |
359 | { | |
360 | return bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set); | |
361 | } | |
362 | ||
bf800ef1 KO |
363 | static inline struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask) |
364 | { | |
365 | return bio_clone_bioset(bio, gfp_mask, fs_bio_set); | |
366 | } | |
367 | ||
3f86a82a KO |
368 | static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs) |
369 | { | |
370 | return bio_alloc_bioset(gfp_mask, nr_iovecs, NULL); | |
371 | } | |
372 | ||
bf800ef1 KO |
373 | static inline struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask) |
374 | { | |
375 | return bio_clone_bioset(bio, gfp_mask, NULL); | |
376 | ||
377 | } | |
378 | ||
6712ecf8 | 379 | extern void bio_endio(struct bio *, int); |
196d38bc | 380 | extern void bio_endio_nodec(struct bio *, int); |
1da177e4 LT |
381 | struct request_queue; |
382 | extern int bio_phys_segments(struct request_queue *, struct bio *); | |
1da177e4 | 383 | |
9e882242 | 384 | extern int submit_bio_wait(int rw, struct bio *bio); |
054bdf64 KO |
385 | extern void bio_advance(struct bio *, unsigned); |
386 | ||
1da177e4 | 387 | extern void bio_init(struct bio *); |
f44b48c7 | 388 | extern void bio_reset(struct bio *); |
196d38bc | 389 | void bio_chain(struct bio *, struct bio *); |
1da177e4 LT |
390 | |
391 | extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int); | |
6e68af66 MC |
392 | extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *, |
393 | unsigned int, unsigned int); | |
1da177e4 LT |
394 | extern int bio_get_nr_vecs(struct block_device *); |
395 | extern struct bio *bio_map_user(struct request_queue *, struct block_device *, | |
a3bce90e | 396 | unsigned long, unsigned int, int, gfp_t); |
f1970baf | 397 | struct sg_iovec; |
152e283f | 398 | struct rq_map_data; |
f1970baf JB |
399 | extern struct bio *bio_map_user_iov(struct request_queue *, |
400 | struct block_device *, | |
86d564c8 | 401 | const struct sg_iovec *, int, int, gfp_t); |
1da177e4 | 402 | extern void bio_unmap_user(struct bio *); |
df46b9a4 | 403 | extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int, |
27496a8c | 404 | gfp_t); |
68154e90 FT |
405 | extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int, |
406 | gfp_t, int); | |
1da177e4 LT |
407 | extern void bio_set_pages_dirty(struct bio *bio); |
408 | extern void bio_check_pages_dirty(struct bio *bio); | |
2d4dc890 IL |
409 | |
410 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
411 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
412 | #endif | |
413 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
414 | extern void bio_flush_dcache_pages(struct bio *bi); | |
415 | #else | |
416 | static inline void bio_flush_dcache_pages(struct bio *bi) | |
417 | { | |
418 | } | |
419 | #endif | |
420 | ||
16ac3d63 | 421 | extern void bio_copy_data(struct bio *dst, struct bio *src); |
a0787606 | 422 | extern int bio_alloc_pages(struct bio *bio, gfp_t gfp); |
16ac3d63 | 423 | |
152e283f FT |
424 | extern struct bio *bio_copy_user(struct request_queue *, struct rq_map_data *, |
425 | unsigned long, unsigned int, int, gfp_t); | |
426 | extern struct bio *bio_copy_user_iov(struct request_queue *, | |
86d564c8 AV |
427 | struct rq_map_data *, |
428 | const struct sg_iovec *, | |
a3bce90e | 429 | int, int, gfp_t); |
1da177e4 LT |
430 | extern int bio_uncopy_user(struct bio *); |
431 | void zero_fill_bio(struct bio *bio); | |
9f060e22 KO |
432 | extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *); |
433 | extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int); | |
7ba1ba12 | 434 | extern unsigned int bvec_nr_vecs(unsigned short idx); |
51d654e1 | 435 | |
852c788f TH |
436 | #ifdef CONFIG_BLK_CGROUP |
437 | int bio_associate_current(struct bio *bio); | |
438 | void bio_disassociate_task(struct bio *bio); | |
439 | #else /* CONFIG_BLK_CGROUP */ | |
440 | static inline int bio_associate_current(struct bio *bio) { return -ENOENT; } | |
441 | static inline void bio_disassociate_task(struct bio *bio) { } | |
442 | #endif /* CONFIG_BLK_CGROUP */ | |
443 | ||
1da177e4 LT |
444 | #ifdef CONFIG_HIGHMEM |
445 | /* | |
20b636bf AB |
446 | * remember never ever reenable interrupts between a bvec_kmap_irq and |
447 | * bvec_kunmap_irq! | |
1da177e4 | 448 | */ |
4f570f99 | 449 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
1da177e4 LT |
450 | { |
451 | unsigned long addr; | |
452 | ||
453 | /* | |
454 | * might not be a highmem page, but the preempt/irq count | |
455 | * balancing is a lot nicer this way | |
456 | */ | |
457 | local_irq_save(*flags); | |
e8e3c3d6 | 458 | addr = (unsigned long) kmap_atomic(bvec->bv_page); |
1da177e4 LT |
459 | |
460 | BUG_ON(addr & ~PAGE_MASK); | |
461 | ||
462 | return (char *) addr + bvec->bv_offset; | |
463 | } | |
464 | ||
4f570f99 | 465 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) |
1da177e4 LT |
466 | { |
467 | unsigned long ptr = (unsigned long) buffer & PAGE_MASK; | |
468 | ||
e8e3c3d6 | 469 | kunmap_atomic((void *) ptr); |
1da177e4 LT |
470 | local_irq_restore(*flags); |
471 | } | |
472 | ||
473 | #else | |
11a691be GU |
474 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
475 | { | |
476 | return page_address(bvec->bv_page) + bvec->bv_offset; | |
477 | } | |
478 | ||
479 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) | |
480 | { | |
481 | *flags = 0; | |
482 | } | |
1da177e4 LT |
483 | #endif |
484 | ||
f619d254 | 485 | static inline char *__bio_kmap_irq(struct bio *bio, struct bvec_iter iter, |
1da177e4 LT |
486 | unsigned long *flags) |
487 | { | |
f619d254 | 488 | return bvec_kmap_irq(&bio_iter_iovec(bio, iter), flags); |
1da177e4 LT |
489 | } |
490 | #define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags) | |
491 | ||
492 | #define bio_kmap_irq(bio, flags) \ | |
f619d254 | 493 | __bio_kmap_irq((bio), (bio)->bi_iter, (flags)) |
1da177e4 LT |
494 | #define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags) |
495 | ||
8f3d8ba2 | 496 | /* |
e686307f | 497 | * BIO list management for use by remapping drivers (e.g. DM or MD) and loop. |
8f3d8ba2 CH |
498 | * |
499 | * A bio_list anchors a singly-linked list of bios chained through the bi_next | |
500 | * member of the bio. The bio_list also caches the last list member to allow | |
501 | * fast access to the tail. | |
502 | */ | |
503 | struct bio_list { | |
504 | struct bio *head; | |
505 | struct bio *tail; | |
506 | }; | |
507 | ||
508 | static inline int bio_list_empty(const struct bio_list *bl) | |
509 | { | |
510 | return bl->head == NULL; | |
511 | } | |
512 | ||
513 | static inline void bio_list_init(struct bio_list *bl) | |
514 | { | |
515 | bl->head = bl->tail = NULL; | |
516 | } | |
517 | ||
320ae51f JA |
518 | #define BIO_EMPTY_LIST { NULL, NULL } |
519 | ||
8f3d8ba2 CH |
520 | #define bio_list_for_each(bio, bl) \ |
521 | for (bio = (bl)->head; bio; bio = bio->bi_next) | |
522 | ||
523 | static inline unsigned bio_list_size(const struct bio_list *bl) | |
524 | { | |
525 | unsigned sz = 0; | |
526 | struct bio *bio; | |
527 | ||
528 | bio_list_for_each(bio, bl) | |
529 | sz++; | |
530 | ||
531 | return sz; | |
532 | } | |
533 | ||
534 | static inline void bio_list_add(struct bio_list *bl, struct bio *bio) | |
535 | { | |
536 | bio->bi_next = NULL; | |
537 | ||
538 | if (bl->tail) | |
539 | bl->tail->bi_next = bio; | |
540 | else | |
541 | bl->head = bio; | |
542 | ||
543 | bl->tail = bio; | |
544 | } | |
545 | ||
546 | static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio) | |
547 | { | |
548 | bio->bi_next = bl->head; | |
549 | ||
550 | bl->head = bio; | |
551 | ||
552 | if (!bl->tail) | |
553 | bl->tail = bio; | |
554 | } | |
555 | ||
556 | static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2) | |
557 | { | |
558 | if (!bl2->head) | |
559 | return; | |
560 | ||
561 | if (bl->tail) | |
562 | bl->tail->bi_next = bl2->head; | |
563 | else | |
564 | bl->head = bl2->head; | |
565 | ||
566 | bl->tail = bl2->tail; | |
567 | } | |
568 | ||
569 | static inline void bio_list_merge_head(struct bio_list *bl, | |
570 | struct bio_list *bl2) | |
571 | { | |
572 | if (!bl2->head) | |
573 | return; | |
574 | ||
575 | if (bl->head) | |
576 | bl2->tail->bi_next = bl->head; | |
577 | else | |
578 | bl->tail = bl2->tail; | |
579 | ||
580 | bl->head = bl2->head; | |
581 | } | |
582 | ||
13685a16 GU |
583 | static inline struct bio *bio_list_peek(struct bio_list *bl) |
584 | { | |
585 | return bl->head; | |
586 | } | |
587 | ||
8f3d8ba2 CH |
588 | static inline struct bio *bio_list_pop(struct bio_list *bl) |
589 | { | |
590 | struct bio *bio = bl->head; | |
591 | ||
592 | if (bio) { | |
593 | bl->head = bl->head->bi_next; | |
594 | if (!bl->head) | |
595 | bl->tail = NULL; | |
596 | ||
597 | bio->bi_next = NULL; | |
598 | } | |
599 | ||
600 | return bio; | |
601 | } | |
602 | ||
603 | static inline struct bio *bio_list_get(struct bio_list *bl) | |
604 | { | |
605 | struct bio *bio = bl->head; | |
606 | ||
607 | bl->head = bl->tail = NULL; | |
608 | ||
609 | return bio; | |
610 | } | |
611 | ||
57fb233f KO |
612 | /* |
613 | * bio_set is used to allow other portions of the IO system to | |
614 | * allocate their own private memory pools for bio and iovec structures. | |
615 | * These memory pools in turn all allocate from the bio_slab | |
616 | * and the bvec_slabs[]. | |
617 | */ | |
618 | #define BIO_POOL_SIZE 2 | |
619 | #define BIOVEC_NR_POOLS 6 | |
620 | #define BIOVEC_MAX_IDX (BIOVEC_NR_POOLS - 1) | |
621 | ||
622 | struct bio_set { | |
623 | struct kmem_cache *bio_slab; | |
624 | unsigned int front_pad; | |
625 | ||
626 | mempool_t *bio_pool; | |
9f060e22 | 627 | mempool_t *bvec_pool; |
57fb233f KO |
628 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
629 | mempool_t *bio_integrity_pool; | |
9f060e22 | 630 | mempool_t *bvec_integrity_pool; |
57fb233f | 631 | #endif |
df2cb6da KO |
632 | |
633 | /* | |
634 | * Deadlock avoidance for stacking block drivers: see comments in | |
635 | * bio_alloc_bioset() for details | |
636 | */ | |
637 | spinlock_t rescue_lock; | |
638 | struct bio_list rescue_list; | |
639 | struct work_struct rescue_work; | |
640 | struct workqueue_struct *rescue_workqueue; | |
57fb233f KO |
641 | }; |
642 | ||
643 | struct biovec_slab { | |
644 | int nr_vecs; | |
645 | char *name; | |
646 | struct kmem_cache *slab; | |
647 | }; | |
648 | ||
649 | /* | |
650 | * a small number of entries is fine, not going to be performance critical. | |
651 | * basically we just need to survive | |
652 | */ | |
653 | #define BIO_SPLIT_ENTRIES 2 | |
654 | ||
7ba1ba12 MP |
655 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
656 | ||
d57a5f7c KO |
657 | #define bip_for_each_vec(bvl, bip, iter) \ |
658 | for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter) | |
7ba1ba12 | 659 | |
13f05c8d MP |
660 | #define bio_for_each_integrity_vec(_bvl, _bio, _iter) \ |
661 | for_each_bio(_bio) \ | |
662 | bip_for_each_vec(_bvl, _bio->bi_integrity, _iter) | |
663 | ||
8deaf721 | 664 | #define bio_integrity(bio) (bio->bi_integrity != NULL) |
7ba1ba12 | 665 | |
7ba1ba12 | 666 | extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int); |
1e2a410f | 667 | extern void bio_integrity_free(struct bio *); |
7ba1ba12 MP |
668 | extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int); |
669 | extern int bio_integrity_enabled(struct bio *bio); | |
670 | extern int bio_integrity_set_tag(struct bio *, void *, unsigned int); | |
671 | extern int bio_integrity_get_tag(struct bio *, void *, unsigned int); | |
672 | extern int bio_integrity_prep(struct bio *); | |
673 | extern void bio_integrity_endio(struct bio *, int); | |
674 | extern void bio_integrity_advance(struct bio *, unsigned int); | |
675 | extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int); | |
1e2a410f | 676 | extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t); |
7878cba9 MP |
677 | extern int bioset_integrity_create(struct bio_set *, int); |
678 | extern void bioset_integrity_free(struct bio_set *); | |
679 | extern void bio_integrity_init(void); | |
7ba1ba12 MP |
680 | |
681 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
682 | ||
6898e3bd MP |
683 | static inline int bio_integrity(struct bio *bio) |
684 | { | |
685 | return 0; | |
686 | } | |
687 | ||
688 | static inline int bio_integrity_enabled(struct bio *bio) | |
689 | { | |
690 | return 0; | |
691 | } | |
692 | ||
693 | static inline int bioset_integrity_create(struct bio_set *bs, int pool_size) | |
694 | { | |
695 | return 0; | |
696 | } | |
697 | ||
698 | static inline void bioset_integrity_free (struct bio_set *bs) | |
699 | { | |
700 | return; | |
701 | } | |
702 | ||
703 | static inline int bio_integrity_prep(struct bio *bio) | |
704 | { | |
705 | return 0; | |
706 | } | |
707 | ||
1e2a410f | 708 | static inline void bio_integrity_free(struct bio *bio) |
6898e3bd MP |
709 | { |
710 | return; | |
711 | } | |
712 | ||
0c614e2d | 713 | static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
1e2a410f | 714 | gfp_t gfp_mask) |
0c614e2d SR |
715 | { |
716 | return 0; | |
717 | } | |
6898e3bd | 718 | |
6898e3bd MP |
719 | static inline void bio_integrity_advance(struct bio *bio, |
720 | unsigned int bytes_done) | |
721 | { | |
722 | return; | |
723 | } | |
724 | ||
725 | static inline void bio_integrity_trim(struct bio *bio, unsigned int offset, | |
726 | unsigned int sectors) | |
727 | { | |
728 | return; | |
729 | } | |
730 | ||
731 | static inline void bio_integrity_init(void) | |
732 | { | |
733 | return; | |
734 | } | |
7ba1ba12 MP |
735 | |
736 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
737 | ||
02a5e0ac | 738 | #endif /* CONFIG_BLOCK */ |
1da177e4 | 739 | #endif /* __LINUX_BIO_H */ |