1
2#ifndef _LINUX_BLKDEV_H
3#define _LINUX_BLKDEV_H
4
5#include <linux/sched.h>
6#include <linux/sched/clock.h>
7#include <linux/major.h>
8#include <linux/genhd.h>
9#include <linux/list.h>
10#include <linux/llist.h>
11#include <linux/minmax.h>
12#include <linux/timer.h>
13#include <linux/workqueue.h>
14#include <linux/pagemap.h>
15#include <linux/backing-dev-defs.h>
16#include <linux/wait.h>
17#include <linux/mempool.h>
18#include <linux/pfn.h>
19#include <linux/bio.h>
20#include <linux/stringify.h>
21#include <linux/gfp.h>
22#include <linux/bsg.h>
23#include <linux/smp.h>
24#include <linux/rcupdate.h>
25#include <linux/percpu-refcount.h>
26#include <linux/scatterlist.h>
27#include <linux/blkzoned.h>
28#include <linux/pm.h>
29
30struct module;
31struct scsi_ioctl_command;
32
33struct request_queue;
34struct elevator_queue;
35struct blk_trace;
36struct request;
37struct sg_io_hdr;
38struct bsg_job;
39struct blkcg_gq;
40struct blk_flush_queue;
41struct pr_ops;
42struct rq_qos;
43struct blk_queue_stats;
44struct blk_stat_callback;
45struct blk_keyslot_manager;
46
47#define BLKDEV_MIN_RQ 4
48#define BLKDEV_MAX_RQ 128
49
50
51#define BLK_MQ_POLL_STATS_BKTS 16
52
53
54#define BLK_MQ_POLL_CLASSIC -1
55
56
57
58
59
60#define BLKCG_MAX_POLS 5
61
62typedef void (rq_end_io_fn)(struct request *, blk_status_t);
63
64
65
66typedef __u32 __bitwise req_flags_t;
67
68
69#define RQF_SORTED ((__force req_flags_t)(1 << 0))
70
71#define RQF_STARTED ((__force req_flags_t)(1 << 1))
72
73#define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3))
74
75#define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4))
76
77#define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5))
78
79#define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6))
80
81#define RQF_DONTPREP ((__force req_flags_t)(1 << 7))
82
83#define RQF_FAILED ((__force req_flags_t)(1 << 10))
84
85#define RQF_QUIET ((__force req_flags_t)(1 << 11))
86
87#define RQF_ELVPRIV ((__force req_flags_t)(1 << 12))
88
89#define RQF_IO_STAT ((__force req_flags_t)(1 << 13))
90
91#define RQF_ALLOCED ((__force req_flags_t)(1 << 14))
92
93#define RQF_PM ((__force req_flags_t)(1 << 15))
94
95#define RQF_HASHED ((__force req_flags_t)(1 << 16))
96
97#define RQF_STATS ((__force req_flags_t)(1 << 17))
98
99
100#define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18))
101
102#define RQF_ZONE_WRITE_LOCKED ((__force req_flags_t)(1 << 19))
103
104#define RQF_MQ_POLL_SLEPT ((__force req_flags_t)(1 << 20))
105
106#define RQF_TIMED_OUT ((__force req_flags_t)(1 << 21))
107
108
109#define RQF_NOMERGE_FLAGS \
110 (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD)
111
112
113
114
115enum mq_rq_state {
116 MQ_RQ_IDLE = 0,
117 MQ_RQ_IN_FLIGHT = 1,
118 MQ_RQ_COMPLETE = 2,
119};
120
121
122
123
124
125
126
127struct request {
128 struct request_queue *q;
129 struct blk_mq_ctx *mq_ctx;
130 struct blk_mq_hw_ctx *mq_hctx;
131
132 unsigned int cmd_flags;
133 req_flags_t rq_flags;
134
135 int tag;
136 int internal_tag;
137
138
139 unsigned int __data_len;
140 sector_t __sector;
141
142 struct bio *bio;
143 struct bio *biotail;
144
145 struct list_head queuelist;
146
147
148
149
150
151
152
153
154 union {
155 struct hlist_node hash;
156 struct list_head ipi_list;
157 };
158
159
160
161
162
163
164 union {
165 struct rb_node rb_node;
166 struct bio_vec special_vec;
167 void *completion_data;
168 int error_count;
169 };
170
171
172
173
174
175
176
177 union {
178 struct {
179 struct io_cq *icq;
180 void *priv[2];
181 } elv;
182
183 struct {
184 unsigned int seq;
185 struct list_head list;
186 rq_end_io_fn *saved_end_io;
187 } flush;
188 };
189
190 struct gendisk *rq_disk;
191 struct block_device *part;
192#ifdef CONFIG_BLK_RQ_ALLOC_TIME
193
194 u64 alloc_time_ns;
195#endif
196
197 u64 start_time_ns;
198
199 u64 io_start_time_ns;
200
201#ifdef CONFIG_BLK_WBT
202 unsigned short wbt_flags;
203#endif
204
205
206
207
208
209 unsigned short stats_sectors;
210
211
212
213
214
215 unsigned short nr_phys_segments;
216
217#if defined(CONFIG_BLK_DEV_INTEGRITY)
218 unsigned short nr_integrity_segments;
219#endif
220
221#ifdef CONFIG_BLK_INLINE_ENCRYPTION
222 struct bio_crypt_ctx *crypt_ctx;
223 struct blk_ksm_keyslot *crypt_keyslot;
224#endif
225
226 unsigned short write_hint;
227 unsigned short ioprio;
228
229 enum mq_rq_state state;
230 refcount_t ref;
231
232 unsigned int timeout;
233 unsigned long deadline;
234
235 union {
236 struct __call_single_data csd;
237 u64 fifo_time;
238 };
239
240
241
242
243 rq_end_io_fn *end_io;
244 void *end_io_data;
245};
246
247static inline bool blk_op_is_scsi(unsigned int op)
248{
249 return op == REQ_OP_SCSI_IN || op == REQ_OP_SCSI_OUT;
250}
251
252static inline bool blk_op_is_private(unsigned int op)
253{
254 return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT;
255}
256
257static inline bool blk_rq_is_scsi(struct request *rq)
258{
259 return blk_op_is_scsi(req_op(rq));
260}
261
262static inline bool blk_rq_is_private(struct request *rq)
263{
264 return blk_op_is_private(req_op(rq));
265}
266
267static inline bool blk_rq_is_passthrough(struct request *rq)
268{
269 return blk_rq_is_scsi(rq) || blk_rq_is_private(rq);
270}
271
272static inline bool bio_is_passthrough(struct bio *bio)
273{
274 unsigned op = bio_op(bio);
275
276 return blk_op_is_scsi(op) || blk_op_is_private(op);
277}
278
279static inline unsigned short req_get_ioprio(struct request *req)
280{
281 return req->ioprio;
282}
283
284#include <linux/elevator.h>
285
286struct blk_queue_ctx;
287
288struct bio_vec;
289
290enum blk_eh_timer_return {
291 BLK_EH_DONE,
292 BLK_EH_RESET_TIMER,
293};
294
295enum blk_queue_state {
296 Queue_down,
297 Queue_up,
298};
299
300#define BLK_TAG_ALLOC_FIFO 0
301#define BLK_TAG_ALLOC_RR 1
302
303#define BLK_SCSI_MAX_CMDS (256)
304#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
305
306
307
308
309
310
311
312enum blk_zoned_model {
313 BLK_ZONED_NONE = 0,
314 BLK_ZONED_HA,
315 BLK_ZONED_HM,
316};
317
318struct queue_limits {
319 unsigned long bounce_pfn;
320 unsigned long seg_boundary_mask;
321 unsigned long virt_boundary_mask;
322
323 unsigned int max_hw_sectors;
324 unsigned int max_dev_sectors;
325 unsigned int chunk_sectors;
326 unsigned int max_sectors;
327 unsigned int max_segment_size;
328 unsigned int physical_block_size;
329 unsigned int logical_block_size;
330 unsigned int alignment_offset;
331 unsigned int io_min;
332 unsigned int io_opt;
333 unsigned int max_discard_sectors;
334 unsigned int max_hw_discard_sectors;
335 unsigned int max_write_same_sectors;
336 unsigned int max_write_zeroes_sectors;
337 unsigned int max_zone_append_sectors;
338 unsigned int discard_granularity;
339 unsigned int discard_alignment;
340
341 unsigned short max_segments;
342 unsigned short max_integrity_segments;
343 unsigned short max_discard_segments;
344
345 unsigned char misaligned;
346 unsigned char discard_misaligned;
347 unsigned char raid_partial_stripes_expensive;
348 enum blk_zoned_model zoned;
349};
350
351typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx,
352 void *data);
353
354void blk_queue_set_zoned(struct gendisk *disk, enum blk_zoned_model model);
355
356#ifdef CONFIG_BLK_DEV_ZONED
357
358#define BLK_ALL_ZONES ((unsigned int)-1)
359int blkdev_report_zones(struct block_device *bdev, sector_t sector,
360 unsigned int nr_zones, report_zones_cb cb, void *data);
361unsigned int blkdev_nr_zones(struct gendisk *disk);
362extern int blkdev_zone_mgmt(struct block_device *bdev, enum req_opf op,
363 sector_t sectors, sector_t nr_sectors,
364 gfp_t gfp_mask);
365int blk_revalidate_disk_zones(struct gendisk *disk,
366 void (*update_driver_data)(struct gendisk *disk));
367
368extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
369 unsigned int cmd, unsigned long arg);
370extern int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode,
371 unsigned int cmd, unsigned long arg);
372
373#else
374
375static inline unsigned int blkdev_nr_zones(struct gendisk *disk)
376{
377 return 0;
378}
379
380static inline int blkdev_report_zones_ioctl(struct block_device *bdev,
381 fmode_t mode, unsigned int cmd,
382 unsigned long arg)
383{
384 return -ENOTTY;
385}
386
387static inline int blkdev_zone_mgmt_ioctl(struct block_device *bdev,
388 fmode_t mode, unsigned int cmd,
389 unsigned long arg)
390{
391 return -ENOTTY;
392}
393
394#endif
395
396struct request_queue {
397 struct request *last_merge;
398 struct elevator_queue *elevator;
399
400 struct percpu_ref q_usage_counter;
401
402 struct blk_queue_stats *stats;
403 struct rq_qos *rq_qos;
404
405 const struct blk_mq_ops *mq_ops;
406
407
408 struct blk_mq_ctx __percpu *queue_ctx;
409
410 unsigned int queue_depth;
411
412
413 struct blk_mq_hw_ctx **queue_hw_ctx;
414 unsigned int nr_hw_queues;
415
416 struct backing_dev_info *backing_dev_info;
417
418
419
420
421
422 void *queuedata;
423
424
425
426
427 unsigned long queue_flags;
428
429
430
431
432 atomic_t pm_only;
433
434
435
436
437
438 int id;
439
440
441
442
443 gfp_t bounce_gfp;
444
445 spinlock_t queue_lock;
446
447
448
449
450 struct kobject kobj;
451
452
453
454
455 struct kobject *mq_kobj;
456
457#ifdef CONFIG_BLK_DEV_INTEGRITY
458 struct blk_integrity integrity;
459#endif
460
461#ifdef CONFIG_PM
462 struct device *dev;
463 enum rpm_status rpm_status;
464 unsigned int nr_pending;
465#endif
466
467
468
469
470 unsigned long nr_requests;
471
472 unsigned int dma_pad_mask;
473 unsigned int dma_alignment;
474
475#ifdef CONFIG_BLK_INLINE_ENCRYPTION
476
477 struct blk_keyslot_manager *ksm;
478#endif
479
480 unsigned int rq_timeout;
481 int poll_nsec;
482
483 struct blk_stat_callback *poll_cb;
484 struct blk_rq_stat poll_stat[BLK_MQ_POLL_STATS_BKTS];
485
486 struct timer_list timeout;
487 struct work_struct timeout_work;
488
489 atomic_t nr_active_requests_shared_sbitmap;
490
491 struct list_head icq_list;
492#ifdef CONFIG_BLK_CGROUP
493 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
494 struct blkcg_gq *root_blkg;
495 struct list_head blkg_list;
496#endif
497
498 struct queue_limits limits;
499
500 unsigned int required_elevator_features;
501
502#ifdef CONFIG_BLK_DEV_ZONED
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520 unsigned int nr_zones;
521 unsigned long *conv_zones_bitmap;
522 unsigned long *seq_zones_wlock;
523 unsigned int max_open_zones;
524 unsigned int max_active_zones;
525#endif
526
527
528
529
530 unsigned int sg_timeout;
531 unsigned int sg_reserved_size;
532 int node;
533 struct mutex debugfs_mutex;
534#ifdef CONFIG_BLK_DEV_IO_TRACE
535 struct blk_trace __rcu *blk_trace;
536#endif
537
538
539
540 struct blk_flush_queue *fq;
541
542 struct list_head requeue_list;
543 spinlock_t requeue_lock;
544 struct delayed_work requeue_work;
545
546 struct mutex sysfs_lock;
547 struct mutex sysfs_dir_lock;
548
549
550
551
552
553 struct list_head unused_hctx_list;
554 spinlock_t unused_hctx_lock;
555
556 int mq_freeze_depth;
557
558#if defined(CONFIG_BLK_DEV_BSG)
559 struct bsg_class_device bsg_dev;
560#endif
561
562#ifdef CONFIG_BLK_DEV_THROTTLING
563
564 struct throtl_data *td;
565#endif
566 struct rcu_head rcu_head;
567 wait_queue_head_t mq_freeze_wq;
568
569
570
571
572 struct mutex mq_freeze_lock;
573
574 struct blk_mq_tag_set *tag_set;
575 struct list_head tag_set_list;
576 struct bio_set bio_split;
577
578 struct dentry *debugfs_dir;
579
580#ifdef CONFIG_BLK_DEBUG_FS
581 struct dentry *sched_debugfs_dir;
582 struct dentry *rqos_debugfs_dir;
583#endif
584
585 bool mq_sysfs_init_done;
586
587 size_t cmd_size;
588
589#define BLK_MAX_WRITE_HINTS 5
590 u64 write_hints[BLK_MAX_WRITE_HINTS];
591};
592
593
594#define QUEUE_FLAG_STOPPED 0
595#define QUEUE_FLAG_DYING 1
596#define QUEUE_FLAG_NOMERGES 3
597#define QUEUE_FLAG_SAME_COMP 4
598#define QUEUE_FLAG_FAIL_IO 5
599#define QUEUE_FLAG_NONROT 6
600#define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT
601#define QUEUE_FLAG_IO_STAT 7
602#define QUEUE_FLAG_DISCARD 8
603#define QUEUE_FLAG_NOXMERGES 9
604#define QUEUE_FLAG_ADD_RANDOM 10
605#define QUEUE_FLAG_SECERASE 11
606#define QUEUE_FLAG_SAME_FORCE 12
607#define QUEUE_FLAG_DEAD 13
608#define QUEUE_FLAG_INIT_DONE 14
609#define QUEUE_FLAG_STABLE_WRITES 15
610#define QUEUE_FLAG_POLL 16
611#define QUEUE_FLAG_WC 17
612#define QUEUE_FLAG_FUA 18
613#define QUEUE_FLAG_DAX 19
614#define QUEUE_FLAG_STATS 20
615#define QUEUE_FLAG_POLL_STATS 21
616#define QUEUE_FLAG_REGISTERED 22
617#define QUEUE_FLAG_SCSI_PASSTHROUGH 23
618#define QUEUE_FLAG_QUIESCED 24
619#define QUEUE_FLAG_PCI_P2PDMA 25
620#define QUEUE_FLAG_ZONE_RESETALL 26
621#define QUEUE_FLAG_RQ_ALLOC_TIME 27
622#define QUEUE_FLAG_HCTX_ACTIVE 28
623#define QUEUE_FLAG_NOWAIT 29
624
625#define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
626 (1 << QUEUE_FLAG_SAME_COMP) | \
627 (1 << QUEUE_FLAG_NOWAIT))
628
629void blk_queue_flag_set(unsigned int flag, struct request_queue *q);
630void blk_queue_flag_clear(unsigned int flag, struct request_queue *q);
631bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
632
633#define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
634#define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
635#define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
636#define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
637#define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
638#define blk_queue_noxmerges(q) \
639 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
640#define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
641#define blk_queue_stable_writes(q) \
642 test_bit(QUEUE_FLAG_STABLE_WRITES, &(q)->queue_flags)
643#define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
644#define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
645#define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
646#define blk_queue_zone_resetall(q) \
647 test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags)
648#define blk_queue_secure_erase(q) \
649 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
650#define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
651#define blk_queue_scsi_passthrough(q) \
652 test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags)
653#define blk_queue_pci_p2pdma(q) \
654 test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags)
655#ifdef CONFIG_BLK_RQ_ALLOC_TIME
656#define blk_queue_rq_alloc_time(q) \
657 test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags)
658#else
659#define blk_queue_rq_alloc_time(q) false
660#endif
661
662#define blk_noretry_request(rq) \
663 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
664 REQ_FAILFAST_DRIVER))
665#define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
666#define blk_queue_pm_only(q) atomic_read(&(q)->pm_only)
667#define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags)
668#define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags)
669#define blk_queue_nowait(q) test_bit(QUEUE_FLAG_NOWAIT, &(q)->queue_flags)
670
671extern void blk_set_pm_only(struct request_queue *q);
672extern void blk_clear_pm_only(struct request_queue *q);
673
674static inline bool blk_account_rq(struct request *rq)
675{
676 return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq);
677}
678
679#define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
680
681#define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ)
682
683#define rq_dma_dir(rq) \
684 (op_is_write(req_op(rq)) ? DMA_TO_DEVICE : DMA_FROM_DEVICE)
685
686#define dma_map_bvec(dev, bv, dir, attrs) \
687 dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \
688 (dir), (attrs))
689
690static inline bool queue_is_mq(struct request_queue *q)
691{
692 return q->mq_ops;
693}
694
695#ifdef CONFIG_PM
696static inline enum rpm_status queue_rpm_status(struct request_queue *q)
697{
698 return q->rpm_status;
699}
700#else
701static inline enum rpm_status queue_rpm_status(struct request_queue *q)
702{
703 return RPM_ACTIVE;
704}
705#endif
706
707static inline enum blk_zoned_model
708blk_queue_zoned_model(struct request_queue *q)
709{
710 if (IS_ENABLED(CONFIG_BLK_DEV_ZONED))
711 return q->limits.zoned;
712 return BLK_ZONED_NONE;
713}
714
715static inline bool blk_queue_is_zoned(struct request_queue *q)
716{
717 switch (blk_queue_zoned_model(q)) {
718 case BLK_ZONED_HA:
719 case BLK_ZONED_HM:
720 return true;
721 default:
722 return false;
723 }
724}
725
726static inline sector_t blk_queue_zone_sectors(struct request_queue *q)
727{
728 return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0;
729}
730
731#ifdef CONFIG_BLK_DEV_ZONED
732static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
733{
734 return blk_queue_is_zoned(q) ? q->nr_zones : 0;
735}
736
737static inline unsigned int blk_queue_zone_no(struct request_queue *q,
738 sector_t sector)
739{
740 if (!blk_queue_is_zoned(q))
741 return 0;
742 return sector >> ilog2(q->limits.chunk_sectors);
743}
744
745static inline bool blk_queue_zone_is_seq(struct request_queue *q,
746 sector_t sector)
747{
748 if (!blk_queue_is_zoned(q))
749 return false;
750 if (!q->conv_zones_bitmap)
751 return true;
752 return !test_bit(blk_queue_zone_no(q, sector), q->conv_zones_bitmap);
753}
754
755static inline void blk_queue_max_open_zones(struct request_queue *q,
756 unsigned int max_open_zones)
757{
758 q->max_open_zones = max_open_zones;
759}
760
761static inline unsigned int queue_max_open_zones(const struct request_queue *q)
762{
763 return q->max_open_zones;
764}
765
766static inline void blk_queue_max_active_zones(struct request_queue *q,
767 unsigned int max_active_zones)
768{
769 q->max_active_zones = max_active_zones;
770}
771
772static inline unsigned int queue_max_active_zones(const struct request_queue *q)
773{
774 return q->max_active_zones;
775}
776#else
777static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
778{
779 return 0;
780}
781static inline bool blk_queue_zone_is_seq(struct request_queue *q,
782 sector_t sector)
783{
784 return false;
785}
786static inline unsigned int blk_queue_zone_no(struct request_queue *q,
787 sector_t sector)
788{
789 return 0;
790}
791static inline unsigned int queue_max_open_zones(const struct request_queue *q)
792{
793 return 0;
794}
795static inline unsigned int queue_max_active_zones(const struct request_queue *q)
796{
797 return 0;
798}
799#endif
800
801static inline bool rq_is_sync(struct request *rq)
802{
803 return op_is_sync(rq->cmd_flags);
804}
805
806static inline bool rq_mergeable(struct request *rq)
807{
808 if (blk_rq_is_passthrough(rq))
809 return false;
810
811 if (req_op(rq) == REQ_OP_FLUSH)
812 return false;
813
814 if (req_op(rq) == REQ_OP_WRITE_ZEROES)
815 return false;
816
817 if (req_op(rq) == REQ_OP_ZONE_APPEND)
818 return false;
819
820 if (rq->cmd_flags & REQ_NOMERGE_FLAGS)
821 return false;
822 if (rq->rq_flags & RQF_NOMERGE_FLAGS)
823 return false;
824
825 return true;
826}
827
828static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b)
829{
830 if (bio_page(a) == bio_page(b) &&
831 bio_offset(a) == bio_offset(b))
832 return true;
833
834 return false;
835}
836
837static inline unsigned int blk_queue_depth(struct request_queue *q)
838{
839 if (q->queue_depth)
840 return q->queue_depth;
841
842 return q->nr_requests;
843}
844
845extern unsigned long blk_max_low_pfn, blk_max_pfn;
846
847
848
849
850
851
852
853
854
855#if BITS_PER_LONG == 32
856#define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
857#else
858#define BLK_BOUNCE_HIGH -1ULL
859#endif
860#define BLK_BOUNCE_ANY (-1ULL)
861#define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
862
863
864
865
866#define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
867#define BLK_MIN_SG_TIMEOUT (7 * HZ)
868
869struct rq_map_data {
870 struct page **pages;
871 int page_order;
872 int nr_entries;
873 unsigned long offset;
874 int null_mapped;
875 int from_user;
876};
877
878struct req_iterator {
879 struct bvec_iter iter;
880 struct bio *bio;
881};
882
883
884#define for_each_bio(_bio) \
885 for (; _bio; _bio = _bio->bi_next)
886#define __rq_for_each_bio(_bio, rq) \
887 if ((rq->bio)) \
888 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
889
890#define rq_for_each_segment(bvl, _rq, _iter) \
891 __rq_for_each_bio(_iter.bio, _rq) \
892 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
893
894#define rq_for_each_bvec(bvl, _rq, _iter) \
895 __rq_for_each_bio(_iter.bio, _rq) \
896 bio_for_each_bvec(bvl, _iter.bio, _iter.iter)
897
898#define rq_iter_last(bvec, _iter) \
899 (_iter.bio->bi_next == NULL && \
900 bio_iter_last(bvec, _iter.iter))
901
902#ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
903# error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
904#endif
905#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
906extern void rq_flush_dcache_pages(struct request *rq);
907#else
908static inline void rq_flush_dcache_pages(struct request *rq)
909{
910}
911#endif
912
913extern int blk_register_queue(struct gendisk *disk);
914extern void blk_unregister_queue(struct gendisk *disk);
915blk_qc_t submit_bio_noacct(struct bio *bio);
916extern void blk_rq_init(struct request_queue *q, struct request *rq);
917extern void blk_put_request(struct request *);
918extern struct request *blk_get_request(struct request_queue *, unsigned int op,
919 blk_mq_req_flags_t flags);
920extern int blk_lld_busy(struct request_queue *q);
921extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
922 struct bio_set *bs, gfp_t gfp_mask,
923 int (*bio_ctr)(struct bio *, struct bio *, void *),
924 void *data);
925extern void blk_rq_unprep_clone(struct request *rq);
926extern blk_status_t blk_insert_cloned_request(struct request_queue *q,
927 struct request *rq);
928extern int blk_rq_append_bio(struct request *rq, struct bio **bio);
929extern void blk_queue_split(struct bio **);
930extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int);
931extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t,
932 unsigned int, void __user *);
933extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
934 unsigned int, void __user *);
935extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
936 struct scsi_ioctl_command __user *);
937extern int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp);
938extern int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp);
939
940extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags);
941extern void blk_queue_exit(struct request_queue *q);
942extern void blk_sync_queue(struct request_queue *q);
943extern int blk_rq_map_user(struct request_queue *, struct request *,
944 struct rq_map_data *, void __user *, unsigned long,
945 gfp_t);
946extern int blk_rq_unmap_user(struct bio *);
947extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t);
948extern int blk_rq_map_user_iov(struct request_queue *, struct request *,
949 struct rq_map_data *, const struct iov_iter *,
950 gfp_t);
951extern void blk_execute_rq(struct request_queue *, struct gendisk *,
952 struct request *, int);
953extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
954 struct request *, int, rq_end_io_fn *);
955
956
957extern const char *blk_op_str(unsigned int op);
958
959int blk_status_to_errno(blk_status_t status);
960blk_status_t errno_to_blk_status(int errno);
961
962int blk_poll(struct request_queue *q, blk_qc_t cookie, bool spin);
963
964static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
965{
966 return bdev->bd_disk->queue;
967}
968
969
970
971
972
973
974
975#ifndef SECTOR_SHIFT
976#define SECTOR_SHIFT 9
977#endif
978#ifndef SECTOR_SIZE
979#define SECTOR_SIZE (1 << SECTOR_SHIFT)
980#endif
981
982
983
984
985
986
987
988
989
990
991static inline sector_t blk_rq_pos(const struct request *rq)
992{
993 return rq->__sector;
994}
995
996static inline unsigned int blk_rq_bytes(const struct request *rq)
997{
998 return rq->__data_len;
999}
1000
1001static inline int blk_rq_cur_bytes(const struct request *rq)
1002{
1003 return rq->bio ? bio_cur_bytes(rq->bio) : 0;
1004}
1005
1006extern unsigned int blk_rq_err_bytes(const struct request *rq);
1007
1008static inline unsigned int blk_rq_sectors(const struct request *rq)
1009{
1010 return blk_rq_bytes(rq) >> SECTOR_SHIFT;
1011}
1012
1013static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
1014{
1015 return blk_rq_cur_bytes(rq) >> SECTOR_SHIFT;
1016}
1017
1018static inline unsigned int blk_rq_stats_sectors(const struct request *rq)
1019{
1020 return rq->stats_sectors;
1021}
1022
1023#ifdef CONFIG_BLK_DEV_ZONED
1024
1025
1026const char *blk_zone_cond_str(enum blk_zone_cond zone_cond);
1027
1028static inline unsigned int blk_rq_zone_no(struct request *rq)
1029{
1030 return blk_queue_zone_no(rq->q, blk_rq_pos(rq));
1031}
1032
1033static inline unsigned int blk_rq_zone_is_seq(struct request *rq)
1034{
1035 return blk_queue_zone_is_seq(rq->q, blk_rq_pos(rq));
1036}
1037#endif
1038
1039
1040
1041
1042
1043
1044
1045static inline unsigned int blk_rq_payload_bytes(struct request *rq)
1046{
1047 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1048 return rq->special_vec.bv_len;
1049 return blk_rq_bytes(rq);
1050}
1051
1052
1053
1054
1055
1056static inline struct bio_vec req_bvec(struct request *rq)
1057{
1058 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1059 return rq->special_vec;
1060 return mp_bvec_iter_bvec(rq->bio->bi_io_vec, rq->bio->bi_iter);
1061}
1062
1063static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
1064 int op)
1065{
1066 if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE))
1067 return min(q->limits.max_discard_sectors,
1068 UINT_MAX >> SECTOR_SHIFT);
1069
1070 if (unlikely(op == REQ_OP_WRITE_SAME))
1071 return q->limits.max_write_same_sectors;
1072
1073 if (unlikely(op == REQ_OP_WRITE_ZEROES))
1074 return q->limits.max_write_zeroes_sectors;
1075
1076 return q->limits.max_sectors;
1077}
1078
1079
1080
1081
1082
1083static inline unsigned int blk_max_size_offset(struct request_queue *q,
1084 sector_t offset,
1085 unsigned int chunk_sectors)
1086{
1087 if (!chunk_sectors) {
1088 if (q->limits.chunk_sectors)
1089 chunk_sectors = q->limits.chunk_sectors;
1090 else
1091 return q->limits.max_sectors;
1092 }
1093
1094 if (likely(is_power_of_2(chunk_sectors)))
1095 chunk_sectors -= offset & (chunk_sectors - 1);
1096 else
1097 chunk_sectors -= sector_div(offset, chunk_sectors);
1098
1099 return min(q->limits.max_sectors, chunk_sectors);
1100}
1101
1102static inline unsigned int blk_rq_get_max_sectors(struct request *rq,
1103 sector_t offset)
1104{
1105 struct request_queue *q = rq->q;
1106
1107 if (blk_rq_is_passthrough(rq))
1108 return q->limits.max_hw_sectors;
1109
1110 if (!q->limits.chunk_sectors ||
1111 req_op(rq) == REQ_OP_DISCARD ||
1112 req_op(rq) == REQ_OP_SECURE_ERASE)
1113 return blk_queue_get_max_sectors(q, req_op(rq));
1114
1115 return min(blk_max_size_offset(q, offset, 0),
1116 blk_queue_get_max_sectors(q, req_op(rq)));
1117}
1118
1119static inline unsigned int blk_rq_count_bios(struct request *rq)
1120{
1121 unsigned int nr_bios = 0;
1122 struct bio *bio;
1123
1124 __rq_for_each_bio(bio, rq)
1125 nr_bios++;
1126
1127 return nr_bios;
1128}
1129
1130void blk_steal_bios(struct bio_list *list, struct request *rq);
1131
1132
1133
1134
1135
1136
1137
1138extern bool blk_update_request(struct request *rq, blk_status_t error,
1139 unsigned int nr_bytes);
1140
1141extern void blk_abort_request(struct request *);
1142
1143
1144
1145
1146extern void blk_cleanup_queue(struct request_queue *);
1147extern void blk_queue_bounce_limit(struct request_queue *, u64);
1148extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
1149extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
1150extern void blk_queue_max_segments(struct request_queue *, unsigned short);
1151extern void blk_queue_max_discard_segments(struct request_queue *,
1152 unsigned short);
1153extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
1154extern void blk_queue_max_discard_sectors(struct request_queue *q,
1155 unsigned int max_discard_sectors);
1156extern void blk_queue_max_write_same_sectors(struct request_queue *q,
1157 unsigned int max_write_same_sectors);
1158extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
1159 unsigned int max_write_same_sectors);
1160extern void blk_queue_logical_block_size(struct request_queue *, unsigned int);
1161extern void blk_queue_max_zone_append_sectors(struct request_queue *q,
1162 unsigned int max_zone_append_sectors);
1163extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
1164extern void blk_queue_alignment_offset(struct request_queue *q,
1165 unsigned int alignment);
1166void blk_queue_update_readahead(struct request_queue *q);
1167extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
1168extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
1169extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
1170extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
1171extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
1172extern void blk_set_default_limits(struct queue_limits *lim);
1173extern void blk_set_stacking_limits(struct queue_limits *lim);
1174extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
1175 sector_t offset);
1176extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
1177 sector_t offset);
1178extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
1179extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
1180extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
1181extern void blk_queue_dma_alignment(struct request_queue *, int);
1182extern void blk_queue_update_dma_alignment(struct request_queue *, int);
1183extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
1184extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
1185extern void blk_queue_required_elevator_features(struct request_queue *q,
1186 unsigned int features);
1187extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q,
1188 struct device *dev);
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199static inline unsigned short blk_rq_nr_phys_segments(struct request *rq)
1200{
1201 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1202 return 1;
1203 return rq->nr_phys_segments;
1204}
1205
1206
1207
1208
1209
1210static inline unsigned short blk_rq_nr_discard_segments(struct request *rq)
1211{
1212 return max_t(unsigned short, rq->nr_phys_segments, 1);
1213}
1214
1215int __blk_rq_map_sg(struct request_queue *q, struct request *rq,
1216 struct scatterlist *sglist, struct scatterlist **last_sg);
1217static inline int blk_rq_map_sg(struct request_queue *q, struct request *rq,
1218 struct scatterlist *sglist)
1219{
1220 struct scatterlist *last_sg = NULL;
1221
1222 return __blk_rq_map_sg(q, rq, sglist, &last_sg);
1223}
1224extern void blk_dump_rq_flags(struct request *, char *);
1225
1226bool __must_check blk_get_queue(struct request_queue *);
1227struct request_queue *blk_alloc_queue(int node_id);
1228extern void blk_put_queue(struct request_queue *);
1229extern void blk_set_queue_dying(struct request_queue *);
1230
1231#ifdef CONFIG_BLOCK
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244struct blk_plug {
1245 struct list_head mq_list;
1246 struct list_head cb_list;
1247 unsigned short rq_count;
1248 bool multiple_queues;
1249 bool nowait;
1250};
1251#define BLK_MAX_REQUEST_COUNT 16
1252#define BLK_PLUG_FLUSH_SIZE (128 * 1024)
1253
1254struct blk_plug_cb;
1255typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
1256struct blk_plug_cb {
1257 struct list_head list;
1258 blk_plug_cb_fn callback;
1259 void *data;
1260};
1261extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
1262 void *data, int size);
1263extern void blk_start_plug(struct blk_plug *);
1264extern void blk_finish_plug(struct blk_plug *);
1265extern void blk_flush_plug_list(struct blk_plug *, bool);
1266
1267static inline void blk_flush_plug(struct task_struct *tsk)
1268{
1269 struct blk_plug *plug = tsk->plug;
1270
1271 if (plug)
1272 blk_flush_plug_list(plug, false);
1273}
1274
1275static inline void blk_schedule_flush_plug(struct task_struct *tsk)
1276{
1277 struct blk_plug *plug = tsk->plug;
1278
1279 if (plug)
1280 blk_flush_plug_list(plug, true);
1281}
1282
1283static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1284{
1285 struct blk_plug *plug = tsk->plug;
1286
1287 return plug &&
1288 (!list_empty(&plug->mq_list) ||
1289 !list_empty(&plug->cb_list));
1290}
1291
1292int blkdev_issue_flush(struct block_device *, gfp_t);
1293long nr_blockdev_pages(void);
1294#else
1295struct blk_plug {
1296};
1297
1298static inline void blk_start_plug(struct blk_plug *plug)
1299{
1300}
1301
1302static inline void blk_finish_plug(struct blk_plug *plug)
1303{
1304}
1305
1306static inline void blk_flush_plug(struct task_struct *task)
1307{
1308}
1309
1310static inline void blk_schedule_flush_plug(struct task_struct *task)
1311{
1312}
1313
1314
1315static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1316{
1317 return false;
1318}
1319
1320static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask)
1321{
1322 return 0;
1323}
1324
1325static inline long nr_blockdev_pages(void)
1326{
1327 return 0;
1328}
1329#endif
1330
1331extern void blk_io_schedule(void);
1332
1333extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
1334 sector_t nr_sects, gfp_t gfp_mask, struct page *page);
1335
1336#define BLKDEV_DISCARD_SECURE (1 << 0)
1337
1338extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1339 sector_t nr_sects, gfp_t gfp_mask, unsigned long flags);
1340extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1341 sector_t nr_sects, gfp_t gfp_mask, int flags,
1342 struct bio **biop);
1343
1344#define BLKDEV_ZERO_NOUNMAP (1 << 0)
1345#define BLKDEV_ZERO_NOFALLBACK (1 << 1)
1346
1347extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1348 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
1349 unsigned flags);
1350extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1351 sector_t nr_sects, gfp_t gfp_mask, unsigned flags);
1352
1353static inline int sb_issue_discard(struct super_block *sb, sector_t block,
1354 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
1355{
1356 return blkdev_issue_discard(sb->s_bdev,
1357 block << (sb->s_blocksize_bits -
1358 SECTOR_SHIFT),
1359 nr_blocks << (sb->s_blocksize_bits -
1360 SECTOR_SHIFT),
1361 gfp_mask, flags);
1362}
1363static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
1364 sector_t nr_blocks, gfp_t gfp_mask)
1365{
1366 return blkdev_issue_zeroout(sb->s_bdev,
1367 block << (sb->s_blocksize_bits -
1368 SECTOR_SHIFT),
1369 nr_blocks << (sb->s_blocksize_bits -
1370 SECTOR_SHIFT),
1371 gfp_mask, 0);
1372}
1373
1374extern int blk_verify_command(unsigned char *cmd, fmode_t mode);
1375
1376static inline bool bdev_is_partition(struct block_device *bdev)
1377{
1378 return bdev->bd_partno;
1379}
1380
1381enum blk_default_limits {
1382 BLK_MAX_SEGMENTS = 128,
1383 BLK_SAFE_MAX_SECTORS = 255,
1384 BLK_DEF_MAX_SECTORS = 2560,
1385 BLK_MAX_SEGMENT_SIZE = 65536,
1386 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
1387};
1388
1389static inline unsigned long queue_segment_boundary(const struct request_queue *q)
1390{
1391 return q->limits.seg_boundary_mask;
1392}
1393
1394static inline unsigned long queue_virt_boundary(const struct request_queue *q)
1395{
1396 return q->limits.virt_boundary_mask;
1397}
1398
1399static inline unsigned int queue_max_sectors(const struct request_queue *q)
1400{
1401 return q->limits.max_sectors;
1402}
1403
1404static inline unsigned int queue_max_hw_sectors(const struct request_queue *q)
1405{
1406 return q->limits.max_hw_sectors;
1407}
1408
1409static inline unsigned short queue_max_segments(const struct request_queue *q)
1410{
1411 return q->limits.max_segments;
1412}
1413
1414static inline unsigned short queue_max_discard_segments(const struct request_queue *q)
1415{
1416 return q->limits.max_discard_segments;
1417}
1418
1419static inline unsigned int queue_max_segment_size(const struct request_queue *q)
1420{
1421 return q->limits.max_segment_size;
1422}
1423
1424static inline unsigned int queue_max_zone_append_sectors(const struct request_queue *q)
1425{
1426
1427 const struct queue_limits *l = &q->limits;
1428
1429 return min(l->max_zone_append_sectors, l->max_sectors);
1430}
1431
1432static inline unsigned queue_logical_block_size(const struct request_queue *q)
1433{
1434 int retval = 512;
1435
1436 if (q && q->limits.logical_block_size)
1437 retval = q->limits.logical_block_size;
1438
1439 return retval;
1440}
1441
1442static inline unsigned int bdev_logical_block_size(struct block_device *bdev)
1443{
1444 return queue_logical_block_size(bdev_get_queue(bdev));
1445}
1446
1447static inline unsigned int queue_physical_block_size(const struct request_queue *q)
1448{
1449 return q->limits.physical_block_size;
1450}
1451
1452static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
1453{
1454 return queue_physical_block_size(bdev_get_queue(bdev));
1455}
1456
1457static inline unsigned int queue_io_min(const struct request_queue *q)
1458{
1459 return q->limits.io_min;
1460}
1461
1462static inline int bdev_io_min(struct block_device *bdev)
1463{
1464 return queue_io_min(bdev_get_queue(bdev));
1465}
1466
1467static inline unsigned int queue_io_opt(const struct request_queue *q)
1468{
1469 return q->limits.io_opt;
1470}
1471
1472static inline int bdev_io_opt(struct block_device *bdev)
1473{
1474 return queue_io_opt(bdev_get_queue(bdev));
1475}
1476
1477static inline int queue_alignment_offset(const struct request_queue *q)
1478{
1479 if (q->limits.misaligned)
1480 return -1;
1481
1482 return q->limits.alignment_offset;
1483}
1484
1485static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector)
1486{
1487 unsigned int granularity = max(lim->physical_block_size, lim->io_min);
1488 unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT)
1489 << SECTOR_SHIFT;
1490
1491 return (granularity + lim->alignment_offset - alignment) % granularity;
1492}
1493
1494static inline int bdev_alignment_offset(struct block_device *bdev)
1495{
1496 struct request_queue *q = bdev_get_queue(bdev);
1497
1498 if (q->limits.misaligned)
1499 return -1;
1500 if (bdev_is_partition(bdev))
1501 return queue_limit_alignment_offset(&q->limits,
1502 bdev->bd_start_sect);
1503 return q->limits.alignment_offset;
1504}
1505
1506static inline int queue_discard_alignment(const struct request_queue *q)
1507{
1508 if (q->limits.discard_misaligned)
1509 return -1;
1510
1511 return q->limits.discard_alignment;
1512}
1513
1514static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector)
1515{
1516 unsigned int alignment, granularity, offset;
1517
1518 if (!lim->max_discard_sectors)
1519 return 0;
1520
1521
1522 alignment = lim->discard_alignment >> SECTOR_SHIFT;
1523 granularity = lim->discard_granularity >> SECTOR_SHIFT;
1524 if (!granularity)
1525 return 0;
1526
1527
1528 offset = sector_div(sector, granularity);
1529
1530
1531 offset = (granularity + alignment - offset) % granularity;
1532
1533
1534 return offset << SECTOR_SHIFT;
1535}
1536
1537static inline int bdev_discard_alignment(struct block_device *bdev)
1538{
1539 struct request_queue *q = bdev_get_queue(bdev);
1540
1541 if (bdev_is_partition(bdev))
1542 return queue_limit_discard_alignment(&q->limits,
1543 bdev->bd_start_sect);
1544 return q->limits.discard_alignment;
1545}
1546
1547static inline unsigned int bdev_write_same(struct block_device *bdev)
1548{
1549 struct request_queue *q = bdev_get_queue(bdev);
1550
1551 if (q)
1552 return q->limits.max_write_same_sectors;
1553
1554 return 0;
1555}
1556
1557static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
1558{
1559 struct request_queue *q = bdev_get_queue(bdev);
1560
1561 if (q)
1562 return q->limits.max_write_zeroes_sectors;
1563
1564 return 0;
1565}
1566
1567static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev)
1568{
1569 struct request_queue *q = bdev_get_queue(bdev);
1570
1571 if (q)
1572 return blk_queue_zoned_model(q);
1573
1574 return BLK_ZONED_NONE;
1575}
1576
1577static inline bool bdev_is_zoned(struct block_device *bdev)
1578{
1579 struct request_queue *q = bdev_get_queue(bdev);
1580
1581 if (q)
1582 return blk_queue_is_zoned(q);
1583
1584 return false;
1585}
1586
1587static inline sector_t bdev_zone_sectors(struct block_device *bdev)
1588{
1589 struct request_queue *q = bdev_get_queue(bdev);
1590
1591 if (q)
1592 return blk_queue_zone_sectors(q);
1593 return 0;
1594}
1595
1596static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
1597{
1598 struct request_queue *q = bdev_get_queue(bdev);
1599
1600 if (q)
1601 return queue_max_open_zones(q);
1602 return 0;
1603}
1604
1605static inline unsigned int bdev_max_active_zones(struct block_device *bdev)
1606{
1607 struct request_queue *q = bdev_get_queue(bdev);
1608
1609 if (q)
1610 return queue_max_active_zones(q);
1611 return 0;
1612}
1613
1614static inline int queue_dma_alignment(const struct request_queue *q)
1615{
1616 return q ? q->dma_alignment : 511;
1617}
1618
1619static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
1620 unsigned int len)
1621{
1622 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
1623 return !(addr & alignment) && !(len & alignment);
1624}
1625
1626
1627static inline unsigned int blksize_bits(unsigned int size)
1628{
1629 unsigned int bits = 8;
1630 do {
1631 bits++;
1632 size >>= 1;
1633 } while (size > 256);
1634 return bits;
1635}
1636
1637static inline unsigned int block_size(struct block_device *bdev)
1638{
1639 return 1 << bdev->bd_inode->i_blkbits;
1640}
1641
1642int kblockd_schedule_work(struct work_struct *work);
1643int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
1644
1645#define MODULE_ALIAS_BLOCKDEV(major,minor) \
1646 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1647#define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1648 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1649
1650#if defined(CONFIG_BLK_DEV_INTEGRITY)
1651
1652enum blk_integrity_flags {
1653 BLK_INTEGRITY_VERIFY = 1 << 0,
1654 BLK_INTEGRITY_GENERATE = 1 << 1,
1655 BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2,
1656 BLK_INTEGRITY_IP_CHECKSUM = 1 << 3,
1657};
1658
1659struct blk_integrity_iter {
1660 void *prot_buf;
1661 void *data_buf;
1662 sector_t seed;
1663 unsigned int data_size;
1664 unsigned short interval;
1665 const char *disk_name;
1666};
1667
1668typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *);
1669typedef void (integrity_prepare_fn) (struct request *);
1670typedef void (integrity_complete_fn) (struct request *, unsigned int);
1671
1672struct blk_integrity_profile {
1673 integrity_processing_fn *generate_fn;
1674 integrity_processing_fn *verify_fn;
1675 integrity_prepare_fn *prepare_fn;
1676 integrity_complete_fn *complete_fn;
1677 const char *name;
1678};
1679
1680extern void blk_integrity_register(struct gendisk *, struct blk_integrity *);
1681extern void blk_integrity_unregister(struct gendisk *);
1682extern int blk_integrity_compare(struct gendisk *, struct gendisk *);
1683extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *,
1684 struct scatterlist *);
1685extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *);
1686
1687static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1688{
1689 struct blk_integrity *bi = &disk->queue->integrity;
1690
1691 if (!bi->profile)
1692 return NULL;
1693
1694 return bi;
1695}
1696
1697static inline
1698struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
1699{
1700 return blk_get_integrity(bdev->bd_disk);
1701}
1702
1703static inline bool
1704blk_integrity_queue_supports_integrity(struct request_queue *q)
1705{
1706 return q->integrity.profile;
1707}
1708
1709static inline bool blk_integrity_rq(struct request *rq)
1710{
1711 return rq->cmd_flags & REQ_INTEGRITY;
1712}
1713
1714static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1715 unsigned int segs)
1716{
1717 q->limits.max_integrity_segments = segs;
1718}
1719
1720static inline unsigned short
1721queue_max_integrity_segments(const struct request_queue *q)
1722{
1723 return q->limits.max_integrity_segments;
1724}
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
1737 unsigned int sectors)
1738{
1739 return sectors >> (bi->interval_exp - 9);
1740}
1741
1742static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
1743 unsigned int sectors)
1744{
1745 return bio_integrity_intervals(bi, sectors) * bi->tuple_size;
1746}
1747
1748
1749
1750
1751
1752static inline struct bio_vec *rq_integrity_vec(struct request *rq)
1753{
1754 if (WARN_ON_ONCE(queue_max_integrity_segments(rq->q) > 1))
1755 return NULL;
1756 return rq->bio->bi_integrity->bip_vec;
1757}
1758
1759#else
1760
1761struct bio;
1762struct block_device;
1763struct gendisk;
1764struct blk_integrity;
1765
1766static inline int blk_integrity_rq(struct request *rq)
1767{
1768 return 0;
1769}
1770static inline int blk_rq_count_integrity_sg(struct request_queue *q,
1771 struct bio *b)
1772{
1773 return 0;
1774}
1775static inline int blk_rq_map_integrity_sg(struct request_queue *q,
1776 struct bio *b,
1777 struct scatterlist *s)
1778{
1779 return 0;
1780}
1781static inline struct blk_integrity *bdev_get_integrity(struct block_device *b)
1782{
1783 return NULL;
1784}
1785static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1786{
1787 return NULL;
1788}
1789static inline bool
1790blk_integrity_queue_supports_integrity(struct request_queue *q)
1791{
1792 return false;
1793}
1794static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b)
1795{
1796 return 0;
1797}
1798static inline void blk_integrity_register(struct gendisk *d,
1799 struct blk_integrity *b)
1800{
1801}
1802static inline void blk_integrity_unregister(struct gendisk *d)
1803{
1804}
1805static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1806 unsigned int segs)
1807{
1808}
1809static inline unsigned short queue_max_integrity_segments(const struct request_queue *q)
1810{
1811 return 0;
1812}
1813
1814static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
1815 unsigned int sectors)
1816{
1817 return 0;
1818}
1819
1820static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
1821 unsigned int sectors)
1822{
1823 return 0;
1824}
1825
1826static inline struct bio_vec *rq_integrity_vec(struct request *rq)
1827{
1828 return NULL;
1829}
1830
1831#endif
1832
1833#ifdef CONFIG_BLK_INLINE_ENCRYPTION
1834
1835bool blk_ksm_register(struct blk_keyslot_manager *ksm, struct request_queue *q);
1836
1837void blk_ksm_unregister(struct request_queue *q);
1838
1839#else
1840
1841static inline bool blk_ksm_register(struct blk_keyslot_manager *ksm,
1842 struct request_queue *q)
1843{
1844 return true;
1845}
1846
1847static inline void blk_ksm_unregister(struct request_queue *q) { }
1848
1849#endif
1850
1851
1852struct block_device_operations {
1853 blk_qc_t (*submit_bio) (struct bio *bio);
1854 int (*open) (struct block_device *, fmode_t);
1855 void (*release) (struct gendisk *, fmode_t);
1856 int (*rw_page)(struct block_device *, sector_t, struct page *, unsigned int);
1857 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1858 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1859 unsigned int (*check_events) (struct gendisk *disk,
1860 unsigned int clearing);
1861 void (*unlock_native_capacity) (struct gendisk *);
1862 int (*revalidate_disk) (struct gendisk *);
1863 int (*getgeo)(struct block_device *, struct hd_geometry *);
1864 int (*set_read_only)(struct block_device *bdev, bool ro);
1865
1866 void (*swap_slot_free_notify) (struct block_device *, unsigned long);
1867 int (*report_zones)(struct gendisk *, sector_t sector,
1868 unsigned int nr_zones, report_zones_cb cb, void *data);
1869 char *(*devnode)(struct gendisk *disk, umode_t *mode);
1870 struct module *owner;
1871 const struct pr_ops *pr_ops;
1872};
1873
1874#ifdef CONFIG_COMPAT
1875extern int blkdev_compat_ptr_ioctl(struct block_device *, fmode_t,
1876 unsigned int, unsigned long);
1877#else
1878#define blkdev_compat_ptr_ioctl NULL
1879#endif
1880
1881extern int bdev_read_page(struct block_device *, sector_t, struct page *);
1882extern int bdev_write_page(struct block_device *, sector_t, struct page *,
1883 struct writeback_control *);
1884
1885#ifdef CONFIG_BLK_DEV_ZONED
1886bool blk_req_needs_zone_write_lock(struct request *rq);
1887bool blk_req_zone_write_trylock(struct request *rq);
1888void __blk_req_zone_write_lock(struct request *rq);
1889void __blk_req_zone_write_unlock(struct request *rq);
1890
1891static inline void blk_req_zone_write_lock(struct request *rq)
1892{
1893 if (blk_req_needs_zone_write_lock(rq))
1894 __blk_req_zone_write_lock(rq);
1895}
1896
1897static inline void blk_req_zone_write_unlock(struct request *rq)
1898{
1899 if (rq->rq_flags & RQF_ZONE_WRITE_LOCKED)
1900 __blk_req_zone_write_unlock(rq);
1901}
1902
1903static inline bool blk_req_zone_is_write_locked(struct request *rq)
1904{
1905 return rq->q->seq_zones_wlock &&
1906 test_bit(blk_rq_zone_no(rq), rq->q->seq_zones_wlock);
1907}
1908
1909static inline bool blk_req_can_dispatch_to_zone(struct request *rq)
1910{
1911 if (!blk_req_needs_zone_write_lock(rq))
1912 return true;
1913 return !blk_req_zone_is_write_locked(rq);
1914}
1915#else
1916static inline bool blk_req_needs_zone_write_lock(struct request *rq)
1917{
1918 return false;
1919}
1920
1921static inline void blk_req_zone_write_lock(struct request *rq)
1922{
1923}
1924
1925static inline void blk_req_zone_write_unlock(struct request *rq)
1926{
1927}
1928static inline bool blk_req_zone_is_write_locked(struct request *rq)
1929{
1930 return false;
1931}
1932
1933static inline bool blk_req_can_dispatch_to_zone(struct request *rq)
1934{
1935 return true;
1936}
1937#endif
1938
1939static inline void blk_wake_io_task(struct task_struct *waiter)
1940{
1941
1942
1943
1944
1945
1946 if (waiter == current)
1947 __set_current_state(TASK_RUNNING);
1948 else
1949 wake_up_process(waiter);
1950}
1951
1952unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors,
1953 unsigned int op);
1954void disk_end_io_acct(struct gendisk *disk, unsigned int op,
1955 unsigned long start_time);
1956
1957unsigned long part_start_io_acct(struct gendisk *disk,
1958 struct block_device **part, struct bio *bio);
1959void part_end_io_acct(struct block_device *part, struct bio *bio,
1960 unsigned long start_time);
1961
1962
1963
1964
1965
1966
1967
1968static inline unsigned long bio_start_io_acct(struct bio *bio)
1969{
1970 return disk_start_io_acct(bio->bi_disk, bio_sectors(bio), bio_op(bio));
1971}
1972
1973
1974
1975
1976
1977
1978static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time)
1979{
1980 return disk_end_io_acct(bio->bi_disk, bio_op(bio), start_time);
1981}
1982
1983int bdev_read_only(struct block_device *bdev);
1984int set_blocksize(struct block_device *bdev, int size);
1985
1986const char *bdevname(struct block_device *bdev, char *buffer);
1987int lookup_bdev(const char *pathname, dev_t *dev);
1988
1989void blkdev_show(struct seq_file *seqf, off_t offset);
1990
1991#define BDEVNAME_SIZE 32
1992#define BDEVT_SIZE 10
1993#ifdef CONFIG_BLOCK
1994#define BLKDEV_MAJOR_MAX 512
1995#else
1996#define BLKDEV_MAJOR_MAX 0
1997#endif
1998
1999struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
2000 void *holder);
2001struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder);
2002int bd_prepare_to_claim(struct block_device *bdev, void *holder);
2003void bd_abort_claiming(struct block_device *bdev, void *holder);
2004void blkdev_put(struct block_device *bdev, fmode_t mode);
2005
2006
2007struct block_device *blkdev_get_no_open(dev_t dev);
2008void blkdev_put_no_open(struct block_device *bdev);
2009
2010struct block_device *bdev_alloc(struct gendisk *disk, u8 partno);
2011void bdev_add(struct block_device *bdev, dev_t dev);
2012struct block_device *I_BDEV(struct inode *inode);
2013struct block_device *bdgrab(struct block_device *bdev);
2014void bdput(struct block_device *);
2015
2016#ifdef CONFIG_BLOCK
2017void invalidate_bdev(struct block_device *bdev);
2018int truncate_bdev_range(struct block_device *bdev, fmode_t mode, loff_t lstart,
2019 loff_t lend);
2020int sync_blockdev(struct block_device *bdev);
2021#else
2022static inline void invalidate_bdev(struct block_device *bdev)
2023{
2024}
2025static inline int truncate_bdev_range(struct block_device *bdev, fmode_t mode,
2026 loff_t lstart, loff_t lend)
2027{
2028 return 0;
2029}
2030static inline int sync_blockdev(struct block_device *bdev)
2031{
2032 return 0;
2033}
2034#endif
2035int fsync_bdev(struct block_device *bdev);
2036
2037int freeze_bdev(struct block_device *bdev);
2038int thaw_bdev(struct block_device *bdev);
2039
2040#endif
2041