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