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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#define BIO_DEBUG
32
33#ifdef BIO_DEBUG
34#define BIO_BUG_ON BUG_ON
35#else
36#define BIO_BUG_ON
37#endif
38
39#define BIO_MAX_PAGES 256
40#define BIO_MAX_SIZE (BIO_MAX_PAGES << PAGE_CACHE_SHIFT)
41#define BIO_MAX_SECTORS (BIO_MAX_SIZE >> 9)
42
43
44
45
46struct bio_vec {
47 struct page *bv_page;
48 unsigned int bv_len;
49 unsigned int bv_offset;
50};
51
52struct bio_set;
53struct bio;
54struct bio_integrity_payload;
55typedef void (bio_end_io_t) (struct bio *, int);
56typedef void (bio_destructor_t) (struct bio *);
57
58
59
60
61
62struct bio {
63 sector_t bi_sector;
64
65 struct bio *bi_next;
66 struct block_device *bi_bdev;
67 unsigned long bi_flags;
68 unsigned long bi_rw;
69
70
71
72 unsigned short bi_vcnt;
73 unsigned short bi_idx;
74
75
76
77
78 unsigned int bi_phys_segments;
79
80 unsigned int bi_size;
81
82
83
84
85
86 unsigned int bi_seg_front_size;
87 unsigned int bi_seg_back_size;
88
89 unsigned int bi_max_vecs;
90
91 unsigned int bi_comp_cpu;
92
93 atomic_t bi_cnt;
94
95 struct bio_vec *bi_io_vec;
96
97 bio_end_io_t *bi_end_io;
98
99 void *bi_private;
100#if defined(CONFIG_BLK_DEV_INTEGRITY)
101 struct bio_integrity_payload *bi_integrity;
102#endif
103
104 bio_destructor_t *bi_destructor;
105
106
107
108
109
110
111 struct bio_vec bi_inline_vecs[0];
112};
113
114
115
116
117#define BIO_UPTODATE 0
118#define BIO_RW_BLOCK 1
119#define BIO_EOF 2
120#define BIO_SEG_VALID 3
121#define BIO_CLONED 4
122#define BIO_BOUNCED 5
123#define BIO_USER_MAPPED 6
124#define BIO_EOPNOTSUPP 7
125#define BIO_CPU_AFFINE 8
126#define BIO_NULL_MAPPED 9
127#define BIO_FS_INTEGRITY 10
128#define BIO_QUIET 11
129#define bio_flagged(bio, flag) ((bio)->bi_flags & (1 << (flag)))
130
131
132
133
134#define BIO_POOL_BITS (4)
135#define BIO_POOL_NONE ((1UL << BIO_POOL_BITS) - 1)
136#define BIO_POOL_OFFSET (BITS_PER_LONG - BIO_POOL_BITS)
137#define BIO_POOL_MASK (1UL << BIO_POOL_OFFSET)
138#define BIO_POOL_IDX(bio) ((bio)->bi_flags >> BIO_POOL_OFFSET)
139
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164
165enum bio_rw_flags {
166 BIO_RW,
167 BIO_RW_FAILFAST_DEV,
168 BIO_RW_FAILFAST_TRANSPORT,
169 BIO_RW_FAILFAST_DRIVER,
170
171 BIO_RW_AHEAD,
172 BIO_RW_BARRIER,
173 BIO_RW_SYNCIO,
174 BIO_RW_UNPLUG,
175 BIO_RW_META,
176 BIO_RW_DISCARD,
177 BIO_RW_NOIDLE,
178};
179
180
181
182
183
184#define BIO_RW_RQ_MASK 0xf
185
186static inline bool bio_rw_flagged(struct bio *bio, enum bio_rw_flags flag)
187{
188 return (bio->bi_rw & (1 << flag)) != 0;
189}
190
191
192
193
194#define BIO_PRIO_SHIFT (8 * sizeof(unsigned long) - IOPRIO_BITS)
195#define bio_prio(bio) ((bio)->bi_rw >> BIO_PRIO_SHIFT)
196#define bio_prio_valid(bio) ioprio_valid(bio_prio(bio))
197
198#define bio_set_prio(bio, prio) do { \
199 WARN_ON(prio >= (1 << IOPRIO_BITS)); \
200 (bio)->bi_rw &= ((1UL << BIO_PRIO_SHIFT) - 1); \
201 (bio)->bi_rw |= ((unsigned long) (prio) << BIO_PRIO_SHIFT); \
202} while (0)
203
204
205
206
207
208#define bio_iovec_idx(bio, idx) (&((bio)->bi_io_vec[(idx)]))
209#define bio_iovec(bio) bio_iovec_idx((bio), (bio)->bi_idx)
210#define bio_page(bio) bio_iovec((bio))->bv_page
211#define bio_offset(bio) bio_iovec((bio))->bv_offset
212#define bio_segments(bio) ((bio)->bi_vcnt - (bio)->bi_idx)
213#define bio_sectors(bio) ((bio)->bi_size >> 9)
214#define bio_empty_barrier(bio) (bio_rw_flagged(bio, BIO_RW_BARRIER) && !bio_has_data(bio) && !bio_rw_flagged(bio, BIO_RW_DISCARD))
215
216static inline unsigned int bio_cur_bytes(struct bio *bio)
217{
218 if (bio->bi_vcnt)
219 return bio_iovec(bio)->bv_len;
220 else
221 return bio->bi_size;
222}
223
224static inline void *bio_data(struct bio *bio)
225{
226 if (bio->bi_vcnt)
227 return page_address(bio_page(bio)) + bio_offset(bio);
228
229 return NULL;
230}
231
232static inline int bio_has_allocated_vec(struct bio *bio)
233{
234 return bio->bi_io_vec && bio->bi_io_vec != bio->bi_inline_vecs;
235}
236
237
238
239
240#define bio_to_phys(bio) (page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio)))
241#define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset)
242
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248
249#define __bio_kmap_atomic(bio, idx, kmtype) \
250 (kmap_atomic(bio_iovec_idx((bio), (idx))->bv_page, kmtype) + \
251 bio_iovec_idx((bio), (idx))->bv_offset)
252
253#define __bio_kunmap_atomic(addr, kmtype) kunmap_atomic(addr, kmtype)
254
255
256
257
258
259#define __BVEC_END(bio) bio_iovec_idx((bio), (bio)->bi_vcnt - 1)
260#define __BVEC_START(bio) bio_iovec_idx((bio), (bio)->bi_idx)
261
262
263#define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
264 ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
265
266
267
268
269#ifndef BIOVEC_PHYS_MERGEABLE
270#define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
271 __BIOVEC_PHYS_MERGEABLE(vec1, vec2)
272#endif
273
274#define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \
275 (((addr1) | (mask)) == (((addr2) - 1) | (mask)))
276#define BIOVEC_SEG_BOUNDARY(q, b1, b2) \
277 __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q)))
278#define BIO_SEG_BOUNDARY(q, b1, b2) \
279 BIOVEC_SEG_BOUNDARY((q), __BVEC_END((b1)), __BVEC_START((b2)))
280
281#define bio_io_error(bio) bio_endio((bio), -EIO)
282
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286
287#define __bio_for_each_segment(bvl, bio, i, start_idx) \
288 for (bvl = bio_iovec_idx((bio), (start_idx)), i = (start_idx); \
289 i < (bio)->bi_vcnt; \
290 bvl++, i++)
291
292#define bio_for_each_segment(bvl, bio, i) \
293 __bio_for_each_segment(bvl, bio, i, (bio)->bi_idx)
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309#define bio_get(bio) atomic_inc(&(bio)->bi_cnt)
310
311#if defined(CONFIG_BLK_DEV_INTEGRITY)
312
313
314
315struct bio_integrity_payload {
316 struct bio *bip_bio;
317
318 sector_t bip_sector;
319
320 void *bip_buf;
321 bio_end_io_t *bip_end_io;
322
323 unsigned int bip_size;
324
325 unsigned short bip_slab;
326 unsigned short bip_vcnt;
327 unsigned short bip_idx;
328
329 struct work_struct bip_work;
330 struct bio_vec bip_vec[0];
331};
332#endif
333
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343
344struct bio_pair {
345 struct bio bio1, bio2;
346 struct bio_vec bv1, bv2;
347#if defined(CONFIG_BLK_DEV_INTEGRITY)
348 struct bio_integrity_payload bip1, bip2;
349 struct bio_vec iv1, iv2;
350#endif
351 atomic_t cnt;
352 int error;
353};
354extern struct bio_pair *bio_split(struct bio *bi, int first_sectors);
355extern void bio_pair_release(struct bio_pair *dbio);
356
357extern struct bio_set *bioset_create(unsigned int, unsigned int);
358extern void bioset_free(struct bio_set *);
359
360extern struct bio *bio_alloc(gfp_t, int);
361extern struct bio *bio_kmalloc(gfp_t, int);
362extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *);
363extern void bio_put(struct bio *);
364extern void bio_free(struct bio *, struct bio_set *);
365
366extern void bio_endio(struct bio *, int);
367struct request_queue;
368extern int bio_phys_segments(struct request_queue *, struct bio *);
369
370extern void __bio_clone(struct bio *, struct bio *);
371extern struct bio *bio_clone(struct bio *, gfp_t);
372
373extern void bio_init(struct bio *);
374
375extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int);
376extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *,
377 unsigned int, unsigned int);
378extern int bio_get_nr_vecs(struct block_device *);
379extern sector_t bio_sector_offset(struct bio *, unsigned short, unsigned int);
380extern struct bio *bio_map_user(struct request_queue *, struct block_device *,
381 unsigned long, unsigned int, int, gfp_t);
382struct sg_iovec;
383struct rq_map_data;
384extern struct bio *bio_map_user_iov(struct request_queue *,
385 struct block_device *,
386 struct sg_iovec *, int, int, gfp_t);
387extern void bio_unmap_user(struct bio *);
388extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int,
389 gfp_t);
390extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int,
391 gfp_t, int);
392extern void bio_set_pages_dirty(struct bio *bio);
393extern void bio_check_pages_dirty(struct bio *bio);
394extern struct bio *bio_copy_user(struct request_queue *, struct rq_map_data *,
395 unsigned long, unsigned int, int, gfp_t);
396extern struct bio *bio_copy_user_iov(struct request_queue *,
397 struct rq_map_data *, struct sg_iovec *,
398 int, int, gfp_t);
399extern int bio_uncopy_user(struct bio *);
400void zero_fill_bio(struct bio *bio);
401extern struct bio_vec *bvec_alloc_bs(gfp_t, int, unsigned long *, struct bio_set *);
402extern void bvec_free_bs(struct bio_set *, struct bio_vec *, unsigned int);
403extern unsigned int bvec_nr_vecs(unsigned short idx);
404
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406
407
408static inline void bio_set_completion_cpu(struct bio *bio, unsigned int cpu)
409{
410 bio->bi_comp_cpu = cpu;
411}
412
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417
418
419#define BIO_POOL_SIZE 2
420#define BIOVEC_NR_POOLS 6
421#define BIOVEC_MAX_IDX (BIOVEC_NR_POOLS - 1)
422
423struct bio_set {
424 struct kmem_cache *bio_slab;
425 unsigned int front_pad;
426
427 mempool_t *bio_pool;
428#if defined(CONFIG_BLK_DEV_INTEGRITY)
429 mempool_t *bio_integrity_pool;
430#endif
431 mempool_t *bvec_pool;
432};
433
434struct biovec_slab {
435 int nr_vecs;
436 char *name;
437 struct kmem_cache *slab;
438};
439
440extern struct bio_set *fs_bio_set;
441extern struct biovec_slab bvec_slabs[BIOVEC_NR_POOLS] __read_mostly;
442
443
444
445
446
447#define BIO_SPLIT_ENTRIES 2
448
449#ifdef CONFIG_HIGHMEM
450
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454
455
456static __always_inline char *bvec_kmap_irq(struct bio_vec *bvec,
457 unsigned long *flags)
458{
459 unsigned long addr;
460
461
462
463
464
465 local_irq_save(*flags);
466 addr = (unsigned long) kmap_atomic(bvec->bv_page, KM_BIO_SRC_IRQ);
467
468 BUG_ON(addr & ~PAGE_MASK);
469
470 return (char *) addr + bvec->bv_offset;
471}
472
473static __always_inline void bvec_kunmap_irq(char *buffer,
474 unsigned long *flags)
475{
476 unsigned long ptr = (unsigned long) buffer & PAGE_MASK;
477
478 kunmap_atomic((void *) ptr, KM_BIO_SRC_IRQ);
479 local_irq_restore(*flags);
480}
481
482#else
483#define bvec_kmap_irq(bvec, flags) (page_address((bvec)->bv_page) + (bvec)->bv_offset)
484#define bvec_kunmap_irq(buf, flags) do { *(flags) = 0; } while (0)
485#endif
486
487static inline char *__bio_kmap_irq(struct bio *bio, unsigned short idx,
488 unsigned long *flags)
489{
490 return bvec_kmap_irq(bio_iovec_idx(bio, idx), flags);
491}
492#define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags)
493
494#define bio_kmap_irq(bio, flags) \
495 __bio_kmap_irq((bio), (bio)->bi_idx, (flags))
496#define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags)
497
498
499
500
501static inline int bio_has_data(struct bio *bio)
502{
503 return bio && bio->bi_io_vec != NULL;
504}
505
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510
511
512
513struct bio_list {
514 struct bio *head;
515 struct bio *tail;
516};
517
518static inline int bio_list_empty(const struct bio_list *bl)
519{
520 return bl->head == NULL;
521}
522
523static inline void bio_list_init(struct bio_list *bl)
524{
525 bl->head = bl->tail = NULL;
526}
527
528#define bio_list_for_each(bio, bl) \
529 for (bio = (bl)->head; bio; bio = bio->bi_next)
530
531static inline unsigned bio_list_size(const struct bio_list *bl)
532{
533 unsigned sz = 0;
534 struct bio *bio;
535
536 bio_list_for_each(bio, bl)
537 sz++;
538
539 return sz;
540}
541
542static inline void bio_list_add(struct bio_list *bl, struct bio *bio)
543{
544 bio->bi_next = NULL;
545
546 if (bl->tail)
547 bl->tail->bi_next = bio;
548 else
549 bl->head = bio;
550
551 bl->tail = bio;
552}
553
554static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio)
555{
556 bio->bi_next = bl->head;
557
558 bl->head = bio;
559
560 if (!bl->tail)
561 bl->tail = bio;
562}
563
564static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2)
565{
566 if (!bl2->head)
567 return;
568
569 if (bl->tail)
570 bl->tail->bi_next = bl2->head;
571 else
572 bl->head = bl2->head;
573
574 bl->tail = bl2->tail;
575}
576
577static inline void bio_list_merge_head(struct bio_list *bl,
578 struct bio_list *bl2)
579{
580 if (!bl2->head)
581 return;
582
583 if (bl->head)
584 bl2->tail->bi_next = bl->head;
585 else
586 bl->tail = bl2->tail;
587
588 bl->head = bl2->head;
589}
590
591static inline struct bio *bio_list_peek(struct bio_list *bl)
592{
593 return bl->head;
594}
595
596static inline struct bio *bio_list_pop(struct bio_list *bl)
597{
598 struct bio *bio = bl->head;
599
600 if (bio) {
601 bl->head = bl->head->bi_next;
602 if (!bl->head)
603 bl->tail = NULL;
604
605 bio->bi_next = NULL;
606 }
607
608 return bio;
609}
610
611static inline struct bio *bio_list_get(struct bio_list *bl)
612{
613 struct bio *bio = bl->head;
614
615 bl->head = bl->tail = NULL;
616
617 return bio;
618}
619
620#if defined(CONFIG_BLK_DEV_INTEGRITY)
621
622#define bip_vec_idx(bip, idx) (&(bip->bip_vec[(idx)]))
623#define bip_vec(bip) bip_vec_idx(bip, 0)
624
625#define __bip_for_each_vec(bvl, bip, i, start_idx) \
626 for (bvl = bip_vec_idx((bip), (start_idx)), i = (start_idx); \
627 i < (bip)->bip_vcnt; \
628 bvl++, i++)
629
630#define bip_for_each_vec(bvl, bip, i) \
631 __bip_for_each_vec(bvl, bip, i, (bip)->bip_idx)
632
633#define bio_integrity(bio) (bio->bi_integrity != NULL)
634
635extern struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *, gfp_t, unsigned int, struct bio_set *);
636extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int);
637extern void bio_integrity_free(struct bio *, struct bio_set *);
638extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int);
639extern int bio_integrity_enabled(struct bio *bio);
640extern int bio_integrity_set_tag(struct bio *, void *, unsigned int);
641extern int bio_integrity_get_tag(struct bio *, void *, unsigned int);
642extern int bio_integrity_prep(struct bio *);
643extern void bio_integrity_endio(struct bio *, int);
644extern void bio_integrity_advance(struct bio *, unsigned int);
645extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int);
646extern void bio_integrity_split(struct bio *, struct bio_pair *, int);
647extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t, struct bio_set *);
648extern int bioset_integrity_create(struct bio_set *, int);
649extern void bioset_integrity_free(struct bio_set *);
650extern void bio_integrity_init(void);
651
652#else
653
654#define bio_integrity(a) (0)
655#define bioset_integrity_create(a, b) (0)
656#define bio_integrity_prep(a) (0)
657#define bio_integrity_enabled(a) (0)
658#define bio_integrity_clone(a, b, c, d) (0)
659#define bioset_integrity_free(a) do { } while (0)
660#define bio_integrity_free(a, b) do { } while (0)
661#define bio_integrity_endio(a, b) do { } while (0)
662#define bio_integrity_advance(a, b) do { } while (0)
663#define bio_integrity_trim(a, b, c) do { } while (0)
664#define bio_integrity_split(a, b, c) do { } while (0)
665#define bio_integrity_set_tag(a, b, c) do { } while (0)
666#define bio_integrity_get_tag(a, b, c) do { } while (0)
667#define bio_integrity_init(a) do { } while (0)
668
669#endif
670
671#endif
672#endif
673