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 | 295 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
180b2f95 MP |
296 | |
297 | static inline struct bio_integrity_payload *bio_integrity(struct bio *bio) | |
298 | { | |
299 | if (bio->bi_rw & REQ_INTEGRITY) | |
300 | return bio->bi_integrity; | |
301 | ||
302 | return NULL; | |
303 | } | |
304 | ||
7ba1ba12 MP |
305 | /* |
306 | * bio integrity payload | |
307 | */ | |
308 | struct bio_integrity_payload { | |
309 | struct bio *bip_bio; /* parent bio */ | |
7ba1ba12 | 310 | |
d57a5f7c | 311 | struct bvec_iter bip_iter; |
7ba1ba12 | 312 | |
d57a5f7c | 313 | bio_end_io_t *bip_end_io; /* saved I/O completion fn */ |
7ba1ba12 | 314 | |
7878cba9 | 315 | unsigned short bip_slab; /* slab the bip came from */ |
7ba1ba12 | 316 | unsigned short bip_vcnt; /* # of integrity bio_vecs */ |
cbcd1054 | 317 | unsigned short bip_max_vcnt; /* integrity bio_vec slots */ |
29ed7813 | 318 | unsigned bip_owns_buf:1; /* should free bip_buf */ |
7ba1ba12 MP |
319 | |
320 | struct work_struct bip_work; /* I/O completion */ | |
6fda981c KO |
321 | |
322 | struct bio_vec *bip_vec; | |
323 | struct bio_vec bip_inline_vecs[0];/* embedded bvec array */ | |
7ba1ba12 | 324 | }; |
18593088 MP |
325 | |
326 | static inline sector_t bip_get_seed(struct bio_integrity_payload *bip) | |
327 | { | |
328 | return bip->bip_iter.bi_sector; | |
329 | } | |
330 | ||
331 | static inline void bip_set_seed(struct bio_integrity_payload *bip, | |
332 | sector_t seed) | |
333 | { | |
334 | bip->bip_iter.bi_sector = seed; | |
335 | } | |
336 | ||
7ba1ba12 | 337 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
1da177e4 | 338 | |
6678d83f | 339 | extern void bio_trim(struct bio *bio, int offset, int size); |
20d0189b KO |
340 | extern struct bio *bio_split(struct bio *bio, int sectors, |
341 | gfp_t gfp, struct bio_set *bs); | |
342 | ||
343 | /** | |
344 | * bio_next_split - get next @sectors from a bio, splitting if necessary | |
345 | * @bio: bio to split | |
346 | * @sectors: number of sectors to split from the front of @bio | |
347 | * @gfp: gfp mask | |
348 | * @bs: bio set to allocate from | |
349 | * | |
350 | * Returns a bio representing the next @sectors of @bio - if the bio is smaller | |
351 | * than @sectors, returns the original bio unchanged. | |
352 | */ | |
353 | static inline struct bio *bio_next_split(struct bio *bio, int sectors, | |
354 | gfp_t gfp, struct bio_set *bs) | |
355 | { | |
356 | if (sectors >= bio_sectors(bio)) | |
357 | return bio; | |
358 | ||
359 | return bio_split(bio, sectors, gfp, bs); | |
360 | } | |
361 | ||
bb799ca0 | 362 | extern struct bio_set *bioset_create(unsigned int, unsigned int); |
1da177e4 | 363 | extern void bioset_free(struct bio_set *); |
a6c39cb4 | 364 | extern mempool_t *biovec_create_pool(int pool_entries); |
1da177e4 | 365 | |
dd0fc66f | 366 | extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *); |
1da177e4 LT |
367 | extern void bio_put(struct bio *); |
368 | ||
59d276fe KO |
369 | extern void __bio_clone_fast(struct bio *, struct bio *); |
370 | extern struct bio *bio_clone_fast(struct bio *, gfp_t, struct bio_set *); | |
bf800ef1 KO |
371 | extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs); |
372 | ||
3f86a82a KO |
373 | extern struct bio_set *fs_bio_set; |
374 | ||
375 | static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) | |
376 | { | |
377 | return bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set); | |
378 | } | |
379 | ||
bf800ef1 KO |
380 | static inline struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask) |
381 | { | |
382 | return bio_clone_bioset(bio, gfp_mask, fs_bio_set); | |
383 | } | |
384 | ||
3f86a82a KO |
385 | static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs) |
386 | { | |
387 | return bio_alloc_bioset(gfp_mask, nr_iovecs, NULL); | |
388 | } | |
389 | ||
bf800ef1 KO |
390 | static inline struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask) |
391 | { | |
392 | return bio_clone_bioset(bio, gfp_mask, NULL); | |
393 | ||
394 | } | |
395 | ||
6712ecf8 | 396 | extern void bio_endio(struct bio *, int); |
196d38bc | 397 | extern void bio_endio_nodec(struct bio *, int); |
1da177e4 LT |
398 | struct request_queue; |
399 | extern int bio_phys_segments(struct request_queue *, struct bio *); | |
1da177e4 | 400 | |
9e882242 | 401 | extern int submit_bio_wait(int rw, struct bio *bio); |
054bdf64 KO |
402 | extern void bio_advance(struct bio *, unsigned); |
403 | ||
1da177e4 | 404 | extern void bio_init(struct bio *); |
f44b48c7 | 405 | extern void bio_reset(struct bio *); |
196d38bc | 406 | void bio_chain(struct bio *, struct bio *); |
1da177e4 LT |
407 | |
408 | extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int); | |
6e68af66 MC |
409 | extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *, |
410 | unsigned int, unsigned int); | |
1da177e4 LT |
411 | extern int bio_get_nr_vecs(struct block_device *); |
412 | extern struct bio *bio_map_user(struct request_queue *, struct block_device *, | |
a3bce90e | 413 | unsigned long, unsigned int, int, gfp_t); |
f1970baf | 414 | struct sg_iovec; |
152e283f | 415 | struct rq_map_data; |
f1970baf JB |
416 | extern struct bio *bio_map_user_iov(struct request_queue *, |
417 | struct block_device *, | |
86d564c8 | 418 | const struct sg_iovec *, int, int, gfp_t); |
1da177e4 | 419 | extern void bio_unmap_user(struct bio *); |
df46b9a4 | 420 | extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int, |
27496a8c | 421 | gfp_t); |
68154e90 FT |
422 | extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int, |
423 | gfp_t, int); | |
1da177e4 LT |
424 | extern void bio_set_pages_dirty(struct bio *bio); |
425 | extern void bio_check_pages_dirty(struct bio *bio); | |
2d4dc890 IL |
426 | |
427 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
428 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
429 | #endif | |
430 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
431 | extern void bio_flush_dcache_pages(struct bio *bi); | |
432 | #else | |
433 | static inline void bio_flush_dcache_pages(struct bio *bi) | |
434 | { | |
435 | } | |
436 | #endif | |
437 | ||
16ac3d63 | 438 | extern void bio_copy_data(struct bio *dst, struct bio *src); |
a0787606 | 439 | extern int bio_alloc_pages(struct bio *bio, gfp_t gfp); |
16ac3d63 | 440 | |
152e283f FT |
441 | extern struct bio *bio_copy_user(struct request_queue *, struct rq_map_data *, |
442 | unsigned long, unsigned int, int, gfp_t); | |
443 | extern struct bio *bio_copy_user_iov(struct request_queue *, | |
86d564c8 AV |
444 | struct rq_map_data *, |
445 | const struct sg_iovec *, | |
a3bce90e | 446 | int, int, gfp_t); |
1da177e4 LT |
447 | extern int bio_uncopy_user(struct bio *); |
448 | void zero_fill_bio(struct bio *bio); | |
9f060e22 KO |
449 | extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *); |
450 | extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int); | |
7ba1ba12 | 451 | extern unsigned int bvec_nr_vecs(unsigned short idx); |
51d654e1 | 452 | |
852c788f TH |
453 | #ifdef CONFIG_BLK_CGROUP |
454 | int bio_associate_current(struct bio *bio); | |
455 | void bio_disassociate_task(struct bio *bio); | |
456 | #else /* CONFIG_BLK_CGROUP */ | |
457 | static inline int bio_associate_current(struct bio *bio) { return -ENOENT; } | |
458 | static inline void bio_disassociate_task(struct bio *bio) { } | |
459 | #endif /* CONFIG_BLK_CGROUP */ | |
460 | ||
1da177e4 LT |
461 | #ifdef CONFIG_HIGHMEM |
462 | /* | |
20b636bf AB |
463 | * remember never ever reenable interrupts between a bvec_kmap_irq and |
464 | * bvec_kunmap_irq! | |
1da177e4 | 465 | */ |
4f570f99 | 466 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
1da177e4 LT |
467 | { |
468 | unsigned long addr; | |
469 | ||
470 | /* | |
471 | * might not be a highmem page, but the preempt/irq count | |
472 | * balancing is a lot nicer this way | |
473 | */ | |
474 | local_irq_save(*flags); | |
e8e3c3d6 | 475 | addr = (unsigned long) kmap_atomic(bvec->bv_page); |
1da177e4 LT |
476 | |
477 | BUG_ON(addr & ~PAGE_MASK); | |
478 | ||
479 | return (char *) addr + bvec->bv_offset; | |
480 | } | |
481 | ||
4f570f99 | 482 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) |
1da177e4 LT |
483 | { |
484 | unsigned long ptr = (unsigned long) buffer & PAGE_MASK; | |
485 | ||
e8e3c3d6 | 486 | kunmap_atomic((void *) ptr); |
1da177e4 LT |
487 | local_irq_restore(*flags); |
488 | } | |
489 | ||
490 | #else | |
11a691be GU |
491 | static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
492 | { | |
493 | return page_address(bvec->bv_page) + bvec->bv_offset; | |
494 | } | |
495 | ||
496 | static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) | |
497 | { | |
498 | *flags = 0; | |
499 | } | |
1da177e4 LT |
500 | #endif |
501 | ||
f619d254 | 502 | static inline char *__bio_kmap_irq(struct bio *bio, struct bvec_iter iter, |
1da177e4 LT |
503 | unsigned long *flags) |
504 | { | |
f619d254 | 505 | return bvec_kmap_irq(&bio_iter_iovec(bio, iter), flags); |
1da177e4 LT |
506 | } |
507 | #define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags) | |
508 | ||
509 | #define bio_kmap_irq(bio, flags) \ | |
f619d254 | 510 | __bio_kmap_irq((bio), (bio)->bi_iter, (flags)) |
1da177e4 LT |
511 | #define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags) |
512 | ||
8f3d8ba2 | 513 | /* |
e686307f | 514 | * BIO list management for use by remapping drivers (e.g. DM or MD) and loop. |
8f3d8ba2 CH |
515 | * |
516 | * A bio_list anchors a singly-linked list of bios chained through the bi_next | |
517 | * member of the bio. The bio_list also caches the last list member to allow | |
518 | * fast access to the tail. | |
519 | */ | |
520 | struct bio_list { | |
521 | struct bio *head; | |
522 | struct bio *tail; | |
523 | }; | |
524 | ||
525 | static inline int bio_list_empty(const struct bio_list *bl) | |
526 | { | |
527 | return bl->head == NULL; | |
528 | } | |
529 | ||
530 | static inline void bio_list_init(struct bio_list *bl) | |
531 | { | |
532 | bl->head = bl->tail = NULL; | |
533 | } | |
534 | ||
320ae51f JA |
535 | #define BIO_EMPTY_LIST { NULL, NULL } |
536 | ||
8f3d8ba2 CH |
537 | #define bio_list_for_each(bio, bl) \ |
538 | for (bio = (bl)->head; bio; bio = bio->bi_next) | |
539 | ||
540 | static inline unsigned bio_list_size(const struct bio_list *bl) | |
541 | { | |
542 | unsigned sz = 0; | |
543 | struct bio *bio; | |
544 | ||
545 | bio_list_for_each(bio, bl) | |
546 | sz++; | |
547 | ||
548 | return sz; | |
549 | } | |
550 | ||
551 | static inline void bio_list_add(struct bio_list *bl, struct bio *bio) | |
552 | { | |
553 | bio->bi_next = NULL; | |
554 | ||
555 | if (bl->tail) | |
556 | bl->tail->bi_next = bio; | |
557 | else | |
558 | bl->head = bio; | |
559 | ||
560 | bl->tail = bio; | |
561 | } | |
562 | ||
563 | static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio) | |
564 | { | |
565 | bio->bi_next = bl->head; | |
566 | ||
567 | bl->head = bio; | |
568 | ||
569 | if (!bl->tail) | |
570 | bl->tail = bio; | |
571 | } | |
572 | ||
573 | static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2) | |
574 | { | |
575 | if (!bl2->head) | |
576 | return; | |
577 | ||
578 | if (bl->tail) | |
579 | bl->tail->bi_next = bl2->head; | |
580 | else | |
581 | bl->head = bl2->head; | |
582 | ||
583 | bl->tail = bl2->tail; | |
584 | } | |
585 | ||
586 | static inline void bio_list_merge_head(struct bio_list *bl, | |
587 | struct bio_list *bl2) | |
588 | { | |
589 | if (!bl2->head) | |
590 | return; | |
591 | ||
592 | if (bl->head) | |
593 | bl2->tail->bi_next = bl->head; | |
594 | else | |
595 | bl->tail = bl2->tail; | |
596 | ||
597 | bl->head = bl2->head; | |
598 | } | |
599 | ||
13685a16 GU |
600 | static inline struct bio *bio_list_peek(struct bio_list *bl) |
601 | { | |
602 | return bl->head; | |
603 | } | |
604 | ||
8f3d8ba2 CH |
605 | static inline struct bio *bio_list_pop(struct bio_list *bl) |
606 | { | |
607 | struct bio *bio = bl->head; | |
608 | ||
609 | if (bio) { | |
610 | bl->head = bl->head->bi_next; | |
611 | if (!bl->head) | |
612 | bl->tail = NULL; | |
613 | ||
614 | bio->bi_next = NULL; | |
615 | } | |
616 | ||
617 | return bio; | |
618 | } | |
619 | ||
620 | static inline struct bio *bio_list_get(struct bio_list *bl) | |
621 | { | |
622 | struct bio *bio = bl->head; | |
623 | ||
624 | bl->head = bl->tail = NULL; | |
625 | ||
626 | return bio; | |
627 | } | |
628 | ||
57fb233f KO |
629 | /* |
630 | * bio_set is used to allow other portions of the IO system to | |
631 | * allocate their own private memory pools for bio and iovec structures. | |
632 | * These memory pools in turn all allocate from the bio_slab | |
633 | * and the bvec_slabs[]. | |
634 | */ | |
635 | #define BIO_POOL_SIZE 2 | |
636 | #define BIOVEC_NR_POOLS 6 | |
637 | #define BIOVEC_MAX_IDX (BIOVEC_NR_POOLS - 1) | |
638 | ||
639 | struct bio_set { | |
640 | struct kmem_cache *bio_slab; | |
641 | unsigned int front_pad; | |
642 | ||
643 | mempool_t *bio_pool; | |
9f060e22 | 644 | mempool_t *bvec_pool; |
57fb233f KO |
645 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
646 | mempool_t *bio_integrity_pool; | |
9f060e22 | 647 | mempool_t *bvec_integrity_pool; |
57fb233f | 648 | #endif |
df2cb6da KO |
649 | |
650 | /* | |
651 | * Deadlock avoidance for stacking block drivers: see comments in | |
652 | * bio_alloc_bioset() for details | |
653 | */ | |
654 | spinlock_t rescue_lock; | |
655 | struct bio_list rescue_list; | |
656 | struct work_struct rescue_work; | |
657 | struct workqueue_struct *rescue_workqueue; | |
57fb233f KO |
658 | }; |
659 | ||
660 | struct biovec_slab { | |
661 | int nr_vecs; | |
662 | char *name; | |
663 | struct kmem_cache *slab; | |
664 | }; | |
665 | ||
666 | /* | |
667 | * a small number of entries is fine, not going to be performance critical. | |
668 | * basically we just need to survive | |
669 | */ | |
670 | #define BIO_SPLIT_ENTRIES 2 | |
671 | ||
7ba1ba12 MP |
672 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
673 | ||
d57a5f7c KO |
674 | #define bip_for_each_vec(bvl, bip, iter) \ |
675 | for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter) | |
7ba1ba12 | 676 | |
13f05c8d MP |
677 | #define bio_for_each_integrity_vec(_bvl, _bio, _iter) \ |
678 | for_each_bio(_bio) \ | |
679 | bip_for_each_vec(_bvl, _bio->bi_integrity, _iter) | |
680 | ||
7ba1ba12 | 681 | extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int); |
1e2a410f | 682 | extern void bio_integrity_free(struct bio *); |
7ba1ba12 | 683 | extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int); |
e7258c1a | 684 | extern bool bio_integrity_enabled(struct bio *bio); |
7ba1ba12 MP |
685 | extern int bio_integrity_prep(struct bio *); |
686 | extern void bio_integrity_endio(struct bio *, int); | |
687 | extern void bio_integrity_advance(struct bio *, unsigned int); | |
688 | extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int); | |
1e2a410f | 689 | extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t); |
7878cba9 MP |
690 | extern int bioset_integrity_create(struct bio_set *, int); |
691 | extern void bioset_integrity_free(struct bio_set *); | |
692 | extern void bio_integrity_init(void); | |
7ba1ba12 MP |
693 | |
694 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
695 | ||
6898e3bd MP |
696 | static inline int bio_integrity(struct bio *bio) |
697 | { | |
698 | return 0; | |
699 | } | |
700 | ||
e7258c1a | 701 | static inline bool bio_integrity_enabled(struct bio *bio) |
6898e3bd | 702 | { |
e7258c1a | 703 | return false; |
6898e3bd MP |
704 | } |
705 | ||
706 | static inline int bioset_integrity_create(struct bio_set *bs, int pool_size) | |
707 | { | |
708 | return 0; | |
709 | } | |
710 | ||
711 | static inline void bioset_integrity_free (struct bio_set *bs) | |
712 | { | |
713 | return; | |
714 | } | |
715 | ||
716 | static inline int bio_integrity_prep(struct bio *bio) | |
717 | { | |
718 | return 0; | |
719 | } | |
720 | ||
1e2a410f | 721 | static inline void bio_integrity_free(struct bio *bio) |
6898e3bd MP |
722 | { |
723 | return; | |
724 | } | |
725 | ||
0c614e2d | 726 | static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
1e2a410f | 727 | gfp_t gfp_mask) |
0c614e2d SR |
728 | { |
729 | return 0; | |
730 | } | |
6898e3bd | 731 | |
6898e3bd MP |
732 | static inline void bio_integrity_advance(struct bio *bio, |
733 | unsigned int bytes_done) | |
734 | { | |
735 | return; | |
736 | } | |
737 | ||
738 | static inline void bio_integrity_trim(struct bio *bio, unsigned int offset, | |
739 | unsigned int sectors) | |
740 | { | |
741 | return; | |
742 | } | |
743 | ||
744 | static inline void bio_integrity_init(void) | |
745 | { | |
746 | return; | |
747 | } | |
7ba1ba12 MP |
748 | |
749 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
750 | ||
02a5e0ac | 751 | #endif /* CONFIG_BLOCK */ |
1da177e4 | 752 | #endif /* __LINUX_BIO_H */ |