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20#ifndef __LINUX_BIO_H
21#define __LINUX_BIO_H
22
23#include <linux/highmem.h>
24#include <linux/mempool.h>
25#include <linux/ioprio.h>
26
27#ifdef CONFIG_BLOCK
28
29#include <asm/io.h>
30
31
32#include <linux/blk_types.h>
33
34#define BIO_DEBUG
35
36#ifdef BIO_DEBUG
37#define BIO_BUG_ON BUG_ON
38#else
39#define BIO_BUG_ON
40#endif
41
42#define BIO_MAX_PAGES 256
43#define BIO_MAX_SIZE (BIO_MAX_PAGES << PAGE_CACHE_SHIFT)
44#define BIO_MAX_SECTORS (BIO_MAX_SIZE >> 9)
45
46
47
48
49#define BIO_PRIO_SHIFT (8 * sizeof(unsigned long) - IOPRIO_BITS)
50#define bio_prio(bio) ((bio)->bi_rw >> BIO_PRIO_SHIFT)
51#define bio_prio_valid(bio) ioprio_valid(bio_prio(bio))
52
53#define bio_set_prio(bio, prio) do { \
54 WARN_ON(prio >= (1 << IOPRIO_BITS)); \
55 (bio)->bi_rw &= ((1UL << BIO_PRIO_SHIFT) - 1); \
56 (bio)->bi_rw |= ((unsigned long) (prio) << BIO_PRIO_SHIFT); \
57} while (0)
58
59
60
61
62
63#define bio_iovec_idx(bio, idx) (&((bio)->bi_io_vec[(idx)]))
64#define bio_iovec(bio) bio_iovec_idx((bio), (bio)->bi_idx)
65#define bio_page(bio) bio_iovec((bio))->bv_page
66#define bio_offset(bio) bio_iovec((bio))->bv_offset
67#define bio_segments(bio) ((bio)->bi_vcnt - (bio)->bi_idx)
68#define bio_sectors(bio) ((bio)->bi_size >> 9)
69
70static inline unsigned int bio_cur_bytes(struct bio *bio)
71{
72 if (bio->bi_vcnt)
73 return bio_iovec(bio)->bv_len;
74 else
75 return bio->bi_size;
76}
77
78static inline void *bio_data(struct bio *bio)
79{
80 if (bio->bi_vcnt)
81 return page_address(bio_page(bio)) + bio_offset(bio);
82
83 return NULL;
84}
85
86static inline int bio_has_allocated_vec(struct bio *bio)
87{
88 return bio->bi_io_vec && bio->bi_io_vec != bio->bi_inline_vecs;
89}
90
91
92
93
94#define bio_to_phys(bio) (page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio)))
95#define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset)
96
97
98
99
100
101
102
103#define __bio_kmap_atomic(bio, idx, kmtype) \
104 (kmap_atomic(bio_iovec_idx((bio), (idx))->bv_page, kmtype) + \
105 bio_iovec_idx((bio), (idx))->bv_offset)
106
107#define __bio_kunmap_atomic(addr, kmtype) kunmap_atomic(addr, kmtype)
108
109
110
111
112
113#define __BVEC_END(bio) bio_iovec_idx((bio), (bio)->bi_vcnt - 1)
114#define __BVEC_START(bio) bio_iovec_idx((bio), (bio)->bi_idx)
115
116
117#define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
118 ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
119
120
121
122
123#ifndef BIOVEC_PHYS_MERGEABLE
124#define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
125 __BIOVEC_PHYS_MERGEABLE(vec1, vec2)
126#endif
127
128#define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \
129 (((addr1) | (mask)) == (((addr2) - 1) | (mask)))
130#define BIOVEC_SEG_BOUNDARY(q, b1, b2) \
131 __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q)))
132#define BIO_SEG_BOUNDARY(q, b1, b2) \
133 BIOVEC_SEG_BOUNDARY((q), __BVEC_END((b1)), __BVEC_START((b2)))
134
135#define bio_io_error(bio) bio_endio((bio), -EIO)
136
137
138
139
140
141#define __bio_for_each_segment(bvl, bio, i, start_idx) \
142 for (bvl = bio_iovec_idx((bio), (start_idx)), i = (start_idx); \
143 i < (bio)->bi_vcnt; \
144 bvl++, i++)
145
146#define bio_for_each_segment(bvl, bio, i) \
147 __bio_for_each_segment(bvl, bio, i, (bio)->bi_idx)
148
149
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152
153
154
155
156
157
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159
160
161
162
163#define bio_get(bio) atomic_inc(&(bio)->bi_cnt)
164
165#if defined(CONFIG_BLK_DEV_INTEGRITY)
166
167
168
169struct bio_integrity_payload {
170 struct bio *bip_bio;
171
172 sector_t bip_sector;
173
174 void *bip_buf;
175 bio_end_io_t *bip_end_io;
176
177 unsigned int bip_size;
178
179 unsigned short bip_slab;
180 unsigned short bip_vcnt;
181 unsigned short bip_idx;
182
183 struct work_struct bip_work;
184 struct bio_vec bip_vec[0];
185};
186#endif
187
188
189
190
191
192
193
194
195
196
197
198struct bio_pair {
199 struct bio bio1, bio2;
200 struct bio_vec bv1, bv2;
201#if defined(CONFIG_BLK_DEV_INTEGRITY)
202 struct bio_integrity_payload bip1, bip2;
203 struct bio_vec iv1, iv2;
204#endif
205 atomic_t cnt;
206 int error;
207};
208extern struct bio_pair *bio_split(struct bio *bi, int first_sectors);
209extern void bio_pair_release(struct bio_pair *dbio);
210
211extern struct bio_set *bioset_create(unsigned int, unsigned int);
212extern void bioset_free(struct bio_set *);
213
214extern struct bio *bio_alloc(gfp_t, int);
215extern struct bio *bio_kmalloc(gfp_t, int);
216extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *);
217extern void bio_put(struct bio *);
218extern void bio_free(struct bio *, struct bio_set *);
219
220extern void bio_endio(struct bio *, int);
221struct request_queue;
222extern int bio_phys_segments(struct request_queue *, struct bio *);
223
224extern void __bio_clone(struct bio *, struct bio *);
225extern struct bio *bio_clone(struct bio *, gfp_t);
226
227extern void bio_init(struct bio *);
228
229extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int);
230extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *,
231 unsigned int, unsigned int);
232extern int bio_get_nr_vecs(struct block_device *);
233extern sector_t bio_sector_offset(struct bio *, unsigned short, unsigned int);
234extern struct bio *bio_map_user(struct request_queue *, struct block_device *,
235 unsigned long, unsigned int, int, gfp_t);
236struct sg_iovec;
237struct rq_map_data;
238extern struct bio *bio_map_user_iov(struct request_queue *,
239 struct block_device *,
240 struct sg_iovec *, int, int, gfp_t);
241extern void bio_unmap_user(struct bio *);
242extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int,
243 gfp_t);
244extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int,
245 gfp_t, int);
246extern void bio_set_pages_dirty(struct bio *bio);
247extern void bio_check_pages_dirty(struct bio *bio);
248
249#ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
250# error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
251#endif
252#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
253extern void bio_flush_dcache_pages(struct bio *bi);
254#else
255static inline void bio_flush_dcache_pages(struct bio *bi)
256{
257}
258#endif
259
260extern struct bio *bio_copy_user(struct request_queue *, struct rq_map_data *,
261 unsigned long, unsigned int, int, gfp_t);
262extern struct bio *bio_copy_user_iov(struct request_queue *,
263 struct rq_map_data *, struct sg_iovec *,
264 int, int, gfp_t);
265extern int bio_uncopy_user(struct bio *);
266void zero_fill_bio(struct bio *bio);
267extern struct bio_vec *bvec_alloc_bs(gfp_t, int, unsigned long *, struct bio_set *);
268extern void bvec_free_bs(struct bio_set *, struct bio_vec *, unsigned int);
269extern unsigned int bvec_nr_vecs(unsigned short idx);
270
271
272
273
274static inline void bio_set_completion_cpu(struct bio *bio, unsigned int cpu)
275{
276 bio->bi_comp_cpu = cpu;
277}
278
279
280
281
282
283
284
285#define BIO_POOL_SIZE 2
286#define BIOVEC_NR_POOLS 6
287#define BIOVEC_MAX_IDX (BIOVEC_NR_POOLS - 1)
288
289struct bio_set {
290 struct kmem_cache *bio_slab;
291 unsigned int front_pad;
292
293 mempool_t *bio_pool;
294#if defined(CONFIG_BLK_DEV_INTEGRITY)
295 mempool_t *bio_integrity_pool;
296#endif
297 mempool_t *bvec_pool;
298};
299
300struct biovec_slab {
301 int nr_vecs;
302 char *name;
303 struct kmem_cache *slab;
304};
305
306extern struct bio_set *fs_bio_set;
307extern struct biovec_slab bvec_slabs[BIOVEC_NR_POOLS] __read_mostly;
308
309
310
311
312
313#define BIO_SPLIT_ENTRIES 2
314
315#ifdef CONFIG_HIGHMEM
316
317
318
319
320static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags)
321{
322 unsigned long addr;
323
324
325
326
327
328 local_irq_save(*flags);
329 addr = (unsigned long) kmap_atomic(bvec->bv_page, KM_BIO_SRC_IRQ);
330
331 BUG_ON(addr & ~PAGE_MASK);
332
333 return (char *) addr + bvec->bv_offset;
334}
335
336static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags)
337{
338 unsigned long ptr = (unsigned long) buffer & PAGE_MASK;
339
340 kunmap_atomic((void *) ptr, KM_BIO_SRC_IRQ);
341 local_irq_restore(*flags);
342}
343
344#else
345static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags)
346{
347 return page_address(bvec->bv_page) + bvec->bv_offset;
348}
349
350static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags)
351{
352 *flags = 0;
353}
354#endif
355
356static inline char *__bio_kmap_irq(struct bio *bio, unsigned short idx,
357 unsigned long *flags)
358{
359 return bvec_kmap_irq(bio_iovec_idx(bio, idx), flags);
360}
361#define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags)
362
363#define bio_kmap_irq(bio, flags) \
364 __bio_kmap_irq((bio), (bio)->bi_idx, (flags))
365#define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags)
366
367
368
369
370static inline int bio_has_data(struct bio *bio)
371{
372 return bio && bio->bi_io_vec != NULL;
373}
374
375
376
377
378
379
380
381
382struct bio_list {
383 struct bio *head;
384 struct bio *tail;
385};
386
387static inline int bio_list_empty(const struct bio_list *bl)
388{
389 return bl->head == NULL;
390}
391
392static inline void bio_list_init(struct bio_list *bl)
393{
394 bl->head = bl->tail = NULL;
395}
396
397#define bio_list_for_each(bio, bl) \
398 for (bio = (bl)->head; bio; bio = bio->bi_next)
399
400static inline unsigned bio_list_size(const struct bio_list *bl)
401{
402 unsigned sz = 0;
403 struct bio *bio;
404
405 bio_list_for_each(bio, bl)
406 sz++;
407
408 return sz;
409}
410
411static inline void bio_list_add(struct bio_list *bl, struct bio *bio)
412{
413 bio->bi_next = NULL;
414
415 if (bl->tail)
416 bl->tail->bi_next = bio;
417 else
418 bl->head = bio;
419
420 bl->tail = bio;
421}
422
423static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio)
424{
425 bio->bi_next = bl->head;
426
427 bl->head = bio;
428
429 if (!bl->tail)
430 bl->tail = bio;
431}
432
433static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2)
434{
435 if (!bl2->head)
436 return;
437
438 if (bl->tail)
439 bl->tail->bi_next = bl2->head;
440 else
441 bl->head = bl2->head;
442
443 bl->tail = bl2->tail;
444}
445
446static inline void bio_list_merge_head(struct bio_list *bl,
447 struct bio_list *bl2)
448{
449 if (!bl2->head)
450 return;
451
452 if (bl->head)
453 bl2->tail->bi_next = bl->head;
454 else
455 bl->tail = bl2->tail;
456
457 bl->head = bl2->head;
458}
459
460static inline struct bio *bio_list_peek(struct bio_list *bl)
461{
462 return bl->head;
463}
464
465static inline struct bio *bio_list_pop(struct bio_list *bl)
466{
467 struct bio *bio = bl->head;
468
469 if (bio) {
470 bl->head = bl->head->bi_next;
471 if (!bl->head)
472 bl->tail = NULL;
473
474 bio->bi_next = NULL;
475 }
476
477 return bio;
478}
479
480static inline struct bio *bio_list_get(struct bio_list *bl)
481{
482 struct bio *bio = bl->head;
483
484 bl->head = bl->tail = NULL;
485
486 return bio;
487}
488
489#if defined(CONFIG_BLK_DEV_INTEGRITY)
490
491#define bip_vec_idx(bip, idx) (&(bip->bip_vec[(idx)]))
492#define bip_vec(bip) bip_vec_idx(bip, 0)
493
494#define __bip_for_each_vec(bvl, bip, i, start_idx) \
495 for (bvl = bip_vec_idx((bip), (start_idx)), i = (start_idx); \
496 i < (bip)->bip_vcnt; \
497 bvl++, i++)
498
499#define bip_for_each_vec(bvl, bip, i) \
500 __bip_for_each_vec(bvl, bip, i, (bip)->bip_idx)
501
502#define bio_for_each_integrity_vec(_bvl, _bio, _iter) \
503 for_each_bio(_bio) \
504 bip_for_each_vec(_bvl, _bio->bi_integrity, _iter)
505
506#define bio_integrity(bio) (bio->bi_integrity != NULL)
507
508extern struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *, gfp_t, unsigned int, struct bio_set *);
509extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int);
510extern void bio_integrity_free(struct bio *, struct bio_set *);
511extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int);
512extern int bio_integrity_enabled(struct bio *bio);
513extern int bio_integrity_set_tag(struct bio *, void *, unsigned int);
514extern int bio_integrity_get_tag(struct bio *, void *, unsigned int);
515extern int bio_integrity_prep(struct bio *);
516extern void bio_integrity_endio(struct bio *, int);
517extern void bio_integrity_advance(struct bio *, unsigned int);
518extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int);
519extern void bio_integrity_split(struct bio *, struct bio_pair *, int);
520extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t, struct bio_set *);
521extern int bioset_integrity_create(struct bio_set *, int);
522extern void bioset_integrity_free(struct bio_set *);
523extern void bio_integrity_init(void);
524
525#else
526
527#define bio_integrity(a) (0)
528#define bioset_integrity_create(a, b) (0)
529#define bio_integrity_prep(a) (0)
530#define bio_integrity_enabled(a) (0)
531#define bio_integrity_clone(a, b, c, d) (0)
532#define bioset_integrity_free(a) do { } while (0)
533#define bio_integrity_free(a, b) do { } while (0)
534#define bio_integrity_endio(a, b) do { } while (0)
535#define bio_integrity_advance(a, b) do { } while (0)
536#define bio_integrity_trim(a, b, c) do { } while (0)
537#define bio_integrity_split(a, b, c) do { } while (0)
538#define bio_integrity_set_tag(a, b, c) do { } while (0)
539#define bio_integrity_get_tag(a, b, c) do { } while (0)
540#define bio_integrity_init(a) do { } while (0)
541
542#endif
543
544#endif
545#endif
546