1#ifndef _LINUX_BLKDEV_H
2#define _LINUX_BLKDEV_H
3
4#include <linux/sched.h>
5#include <linux/sched/clock.h>
6
7#ifdef CONFIG_BLOCK
8
9#include <linux/major.h>
10#include <linux/genhd.h>
11#include <linux/list.h>
12#include <linux/llist.h>
13#include <linux/timer.h>
14#include <linux/workqueue.h>
15#include <linux/pagemap.h>
16#include <linux/backing-dev-defs.h>
17#include <linux/wait.h>
18#include <linux/mempool.h>
19#include <linux/pfn.h>
20#include <linux/bio.h>
21#include <linux/stringify.h>
22#include <linux/gfp.h>
23#include <linux/bsg.h>
24#include <linux/smp.h>
25#include <linux/rcupdate.h>
26#include <linux/percpu-refcount.h>
27#include <linux/scatterlist.h>
28#include <linux/blkzoned.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_wb;
43struct blk_queue_stats;
44struct blk_stat_callback;
45
46#define BLKDEV_MIN_RQ 4
47#define BLKDEV_MAX_RQ 128
48
49
50#define BLK_MQ_POLL_STATS_BKTS 16
51
52
53
54
55
56#define BLKCG_MAX_POLS 3
57
58typedef void (rq_end_io_fn)(struct request *, blk_status_t);
59
60#define BLK_RL_SYNCFULL (1U << 0)
61#define BLK_RL_ASYNCFULL (1U << 1)
62
63struct request_list {
64 struct request_queue *q;
65#ifdef CONFIG_BLK_CGROUP
66 struct blkcg_gq *blkg;
67#endif
68
69
70
71
72 int count[2];
73 int starved[2];
74 mempool_t *rq_pool;
75 wait_queue_head_t wait[2];
76 unsigned int flags;
77};
78
79
80
81typedef __u32 __bitwise req_flags_t;
82
83
84#define RQF_SORTED ((__force req_flags_t)(1 << 0))
85
86#define RQF_STARTED ((__force req_flags_t)(1 << 1))
87
88#define RQF_QUEUED ((__force req_flags_t)(1 << 2))
89
90#define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3))
91
92#define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4))
93
94#define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5))
95
96#define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6))
97
98#define RQF_DONTPREP ((__force req_flags_t)(1 << 7))
99
100
101#define RQF_PREEMPT ((__force req_flags_t)(1 << 8))
102
103#define RQF_COPY_USER ((__force req_flags_t)(1 << 9))
104
105#define RQF_FAILED ((__force req_flags_t)(1 << 10))
106
107#define RQF_QUIET ((__force req_flags_t)(1 << 11))
108
109#define RQF_ELVPRIV ((__force req_flags_t)(1 << 12))
110
111#define RQF_IO_STAT ((__force req_flags_t)(1 << 13))
112
113#define RQF_ALLOCED ((__force req_flags_t)(1 << 14))
114
115#define RQF_PM ((__force req_flags_t)(1 << 15))
116
117#define RQF_HASHED ((__force req_flags_t)(1 << 16))
118
119#define RQF_STATS ((__force req_flags_t)(1 << 17))
120
121
122#define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18))
123
124
125#define RQF_NOMERGE_FLAGS \
126 (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD)
127
128
129
130
131
132
133
134struct request {
135 struct list_head queuelist;
136 union {
137 struct call_single_data csd;
138 u64 fifo_time;
139 };
140
141 struct request_queue *q;
142 struct blk_mq_ctx *mq_ctx;
143
144 int cpu;
145 unsigned int cmd_flags;
146 req_flags_t rq_flags;
147
148 int internal_tag;
149
150 unsigned long atomic_flags;
151
152
153 unsigned int __data_len;
154 int tag;
155 sector_t __sector;
156
157 struct bio *bio;
158 struct bio *biotail;
159
160
161
162
163
164
165
166
167 union {
168 struct hlist_node hash;
169 struct list_head ipi_list;
170 };
171
172
173
174
175
176
177 union {
178 struct rb_node rb_node;
179 struct bio_vec special_vec;
180 void *completion_data;
181 int error_count;
182 };
183
184
185
186
187
188
189
190 union {
191 struct {
192 struct io_cq *icq;
193 void *priv[2];
194 } elv;
195
196 struct {
197 unsigned int seq;
198 struct list_head list;
199 rq_end_io_fn *saved_end_io;
200 } flush;
201 };
202
203 struct gendisk *rq_disk;
204 struct hd_struct *part;
205 unsigned long start_time;
206 struct blk_issue_stat issue_stat;
207#ifdef CONFIG_BLK_CGROUP
208 struct request_list *rl;
209 unsigned long long start_time_ns;
210 unsigned long long io_start_time_ns;
211#endif
212
213
214
215 unsigned short nr_phys_segments;
216#if defined(CONFIG_BLK_DEV_INTEGRITY)
217 unsigned short nr_integrity_segments;
218#endif
219
220 unsigned short ioprio;
221
222 unsigned int timeout;
223
224 void *special;
225
226 unsigned int extra_len;
227
228 unsigned short write_hint;
229
230 unsigned long deadline;
231 struct list_head timeout_list;
232
233
234
235
236 rq_end_io_fn *end_io;
237 void *end_io_data;
238
239
240 struct request *next_rq;
241};
242
243static inline bool blk_rq_is_scsi(struct request *rq)
244{
245 return req_op(rq) == REQ_OP_SCSI_IN || req_op(rq) == REQ_OP_SCSI_OUT;
246}
247
248static inline bool blk_rq_is_private(struct request *rq)
249{
250 return req_op(rq) == REQ_OP_DRV_IN || req_op(rq) == REQ_OP_DRV_OUT;
251}
252
253static inline bool blk_rq_is_passthrough(struct request *rq)
254{
255 return blk_rq_is_scsi(rq) || blk_rq_is_private(rq);
256}
257
258static inline unsigned short req_get_ioprio(struct request *req)
259{
260 return req->ioprio;
261}
262
263#include <linux/elevator.h>
264
265struct blk_queue_ctx;
266
267typedef void (request_fn_proc) (struct request_queue *q);
268typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio);
269typedef int (prep_rq_fn) (struct request_queue *, struct request *);
270typedef void (unprep_rq_fn) (struct request_queue *, struct request *);
271
272struct bio_vec;
273typedef void (softirq_done_fn)(struct request *);
274typedef int (dma_drain_needed_fn)(struct request *);
275typedef int (lld_busy_fn) (struct request_queue *q);
276typedef int (bsg_job_fn) (struct bsg_job *);
277typedef int (init_rq_fn)(struct request_queue *, struct request *, gfp_t);
278typedef void (exit_rq_fn)(struct request_queue *, struct request *);
279
280enum blk_eh_timer_return {
281 BLK_EH_NOT_HANDLED,
282 BLK_EH_HANDLED,
283 BLK_EH_RESET_TIMER,
284};
285
286typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *);
287
288enum blk_queue_state {
289 Queue_down,
290 Queue_up,
291};
292
293struct blk_queue_tag {
294 struct request **tag_index;
295 unsigned long *tag_map;
296 int max_depth;
297 int real_max_depth;
298 atomic_t refcnt;
299 int alloc_policy;
300 int next_tag;
301};
302#define BLK_TAG_ALLOC_FIFO 0
303#define BLK_TAG_ALLOC_RR 1
304
305#define BLK_SCSI_MAX_CMDS (256)
306#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
307
308
309
310
311enum blk_zoned_model {
312 BLK_ZONED_NONE,
313 BLK_ZONED_HA,
314 BLK_ZONED_HM,
315};
316
317struct queue_limits {
318 unsigned long bounce_pfn;
319 unsigned long seg_boundary_mask;
320 unsigned long virt_boundary_mask;
321
322 unsigned int max_hw_sectors;
323 unsigned int max_dev_sectors;
324 unsigned int chunk_sectors;
325 unsigned int max_sectors;
326 unsigned int max_segment_size;
327 unsigned int physical_block_size;
328 unsigned int alignment_offset;
329 unsigned int io_min;
330 unsigned int io_opt;
331 unsigned int max_discard_sectors;
332 unsigned int max_hw_discard_sectors;
333 unsigned int max_write_same_sectors;
334 unsigned int max_write_zeroes_sectors;
335 unsigned int discard_granularity;
336 unsigned int discard_alignment;
337
338 unsigned short logical_block_size;
339 unsigned short max_segments;
340 unsigned short max_integrity_segments;
341 unsigned short max_discard_segments;
342
343 unsigned char misaligned;
344 unsigned char discard_misaligned;
345 unsigned char cluster;
346 unsigned char raid_partial_stripes_expensive;
347 enum blk_zoned_model zoned;
348};
349
350#ifdef CONFIG_BLK_DEV_ZONED
351
352struct blk_zone_report_hdr {
353 unsigned int nr_zones;
354 u8 padding[60];
355};
356
357extern int blkdev_report_zones(struct block_device *bdev,
358 sector_t sector, struct blk_zone *zones,
359 unsigned int *nr_zones, gfp_t gfp_mask);
360extern int blkdev_reset_zones(struct block_device *bdev, sector_t sectors,
361 sector_t nr_sectors, gfp_t gfp_mask);
362
363extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
364 unsigned int cmd, unsigned long arg);
365extern int blkdev_reset_zones_ioctl(struct block_device *bdev, fmode_t mode,
366 unsigned int cmd, unsigned long arg);
367
368#else
369
370static inline int blkdev_report_zones_ioctl(struct block_device *bdev,
371 fmode_t mode, unsigned int cmd,
372 unsigned long arg)
373{
374 return -ENOTTY;
375}
376
377static inline int blkdev_reset_zones_ioctl(struct block_device *bdev,
378 fmode_t mode, unsigned int cmd,
379 unsigned long arg)
380{
381 return -ENOTTY;
382}
383
384#endif
385
386struct request_queue {
387
388
389
390 struct list_head queue_head;
391 struct request *last_merge;
392 struct elevator_queue *elevator;
393 int nr_rqs[2];
394 int nr_rqs_elvpriv;
395
396 atomic_t shared_hctx_restart;
397
398 struct blk_queue_stats *stats;
399 struct rq_wb *rq_wb;
400
401
402
403
404
405
406
407 struct request_list root_rl;
408
409 request_fn_proc *request_fn;
410 make_request_fn *make_request_fn;
411 prep_rq_fn *prep_rq_fn;
412 unprep_rq_fn *unprep_rq_fn;
413 softirq_done_fn *softirq_done_fn;
414 rq_timed_out_fn *rq_timed_out_fn;
415 dma_drain_needed_fn *dma_drain_needed;
416 lld_busy_fn *lld_busy_fn;
417
418 init_rq_fn *init_rq_fn;
419
420 exit_rq_fn *exit_rq_fn;
421
422 void (*initialize_rq_fn)(struct request *rq);
423
424 const struct blk_mq_ops *mq_ops;
425
426 unsigned int *mq_map;
427
428
429 struct blk_mq_ctx __percpu *queue_ctx;
430 unsigned int nr_queues;
431
432 unsigned int queue_depth;
433
434
435 struct blk_mq_hw_ctx **queue_hw_ctx;
436 unsigned int nr_hw_queues;
437
438
439
440
441 sector_t end_sector;
442 struct request *boundary_rq;
443
444
445
446
447 struct delayed_work delay_work;
448
449 struct backing_dev_info *backing_dev_info;
450
451
452
453
454
455 void *queuedata;
456
457
458
459
460 unsigned long queue_flags;
461
462
463
464
465
466 int id;
467
468
469
470
471 gfp_t bounce_gfp;
472
473
474
475
476
477
478 spinlock_t __queue_lock;
479 spinlock_t *queue_lock;
480
481
482
483
484 struct kobject kobj;
485
486
487
488
489 struct kobject mq_kobj;
490
491#ifdef CONFIG_BLK_DEV_INTEGRITY
492 struct blk_integrity integrity;
493#endif
494
495#ifdef CONFIG_PM
496 struct device *dev;
497 int rpm_status;
498 unsigned int nr_pending;
499#endif
500
501
502
503
504 unsigned long nr_requests;
505 unsigned int nr_congestion_on;
506 unsigned int nr_congestion_off;
507 unsigned int nr_batching;
508
509 unsigned int dma_drain_size;
510 void *dma_drain_buffer;
511 unsigned int dma_pad_mask;
512 unsigned int dma_alignment;
513
514 struct blk_queue_tag *queue_tags;
515 struct list_head tag_busy_list;
516
517 unsigned int nr_sorted;
518 unsigned int in_flight[2];
519
520
521
522
523
524
525 unsigned int request_fn_active;
526
527 unsigned int rq_timeout;
528 int poll_nsec;
529
530 struct blk_stat_callback *poll_cb;
531 struct blk_rq_stat poll_stat[BLK_MQ_POLL_STATS_BKTS];
532
533 struct timer_list timeout;
534 struct work_struct timeout_work;
535 struct list_head timeout_list;
536
537 struct list_head icq_list;
538#ifdef CONFIG_BLK_CGROUP
539 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
540 struct blkcg_gq *root_blkg;
541 struct list_head blkg_list;
542#endif
543
544 struct queue_limits limits;
545
546
547
548
549 unsigned int sg_timeout;
550 unsigned int sg_reserved_size;
551 int node;
552#ifdef CONFIG_BLK_DEV_IO_TRACE
553 struct blk_trace *blk_trace;
554#endif
555
556
557
558 struct blk_flush_queue *fq;
559
560 struct list_head requeue_list;
561 spinlock_t requeue_lock;
562 struct delayed_work requeue_work;
563
564 struct mutex sysfs_lock;
565
566 int bypass_depth;
567 atomic_t mq_freeze_depth;
568
569#if defined(CONFIG_BLK_DEV_BSG)
570 bsg_job_fn *bsg_job_fn;
571 struct bsg_class_device bsg_dev;
572#endif
573
574#ifdef CONFIG_BLK_DEV_THROTTLING
575
576 struct throtl_data *td;
577#endif
578 struct rcu_head rcu_head;
579 wait_queue_head_t mq_freeze_wq;
580 struct percpu_ref q_usage_counter;
581 struct list_head all_q_node;
582
583 struct blk_mq_tag_set *tag_set;
584 struct list_head tag_set_list;
585 struct bio_set *bio_split;
586
587#ifdef CONFIG_BLK_DEBUG_FS
588 struct dentry *debugfs_dir;
589 struct dentry *sched_debugfs_dir;
590#endif
591
592 bool mq_sysfs_init_done;
593
594 size_t cmd_size;
595 void *rq_alloc_data;
596
597 struct work_struct release_work;
598
599#define BLK_MAX_WRITE_HINTS 5
600 u64 write_hints[BLK_MAX_WRITE_HINTS];
601};
602
603#define QUEUE_FLAG_QUEUED 1
604#define QUEUE_FLAG_STOPPED 2
605#define QUEUE_FLAG_SYNCFULL 3
606#define QUEUE_FLAG_ASYNCFULL 4
607#define QUEUE_FLAG_DYING 5
608#define QUEUE_FLAG_BYPASS 6
609#define QUEUE_FLAG_BIDI 7
610#define QUEUE_FLAG_NOMERGES 8
611#define QUEUE_FLAG_SAME_COMP 9
612#define QUEUE_FLAG_FAIL_IO 10
613#define QUEUE_FLAG_STACKABLE 11
614#define QUEUE_FLAG_NONROT 12
615#define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT
616#define QUEUE_FLAG_IO_STAT 13
617#define QUEUE_FLAG_DISCARD 14
618#define QUEUE_FLAG_NOXMERGES 15
619#define QUEUE_FLAG_ADD_RANDOM 16
620#define QUEUE_FLAG_SECERASE 17
621#define QUEUE_FLAG_SAME_FORCE 18
622#define QUEUE_FLAG_DEAD 19
623#define QUEUE_FLAG_INIT_DONE 20
624#define QUEUE_FLAG_NO_SG_MERGE 21
625#define QUEUE_FLAG_POLL 22
626#define QUEUE_FLAG_WC 23
627#define QUEUE_FLAG_FUA 24
628#define QUEUE_FLAG_FLUSH_NQ 25
629#define QUEUE_FLAG_DAX 26
630#define QUEUE_FLAG_STATS 27
631#define QUEUE_FLAG_POLL_STATS 28
632#define QUEUE_FLAG_REGISTERED 29
633#define QUEUE_FLAG_SCSI_PASSTHROUGH 30
634#define QUEUE_FLAG_QUIESCED 31
635
636#define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
637 (1 << QUEUE_FLAG_STACKABLE) | \
638 (1 << QUEUE_FLAG_SAME_COMP) | \
639 (1 << QUEUE_FLAG_ADD_RANDOM))
640
641#define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
642 (1 << QUEUE_FLAG_STACKABLE) | \
643 (1 << QUEUE_FLAG_SAME_COMP) | \
644 (1 << QUEUE_FLAG_POLL))
645
646
647
648
649
650
651
652
653static inline void queue_lockdep_assert_held(struct request_queue *q)
654{
655 if (q->queue_lock)
656 lockdep_assert_held(q->queue_lock);
657}
658
659static inline void queue_flag_set_unlocked(unsigned int flag,
660 struct request_queue *q)
661{
662 __set_bit(flag, &q->queue_flags);
663}
664
665static inline int queue_flag_test_and_clear(unsigned int flag,
666 struct request_queue *q)
667{
668 queue_lockdep_assert_held(q);
669
670 if (test_bit(flag, &q->queue_flags)) {
671 __clear_bit(flag, &q->queue_flags);
672 return 1;
673 }
674
675 return 0;
676}
677
678static inline int queue_flag_test_and_set(unsigned int flag,
679 struct request_queue *q)
680{
681 queue_lockdep_assert_held(q);
682
683 if (!test_bit(flag, &q->queue_flags)) {
684 __set_bit(flag, &q->queue_flags);
685 return 0;
686 }
687
688 return 1;
689}
690
691static inline void queue_flag_set(unsigned int flag, struct request_queue *q)
692{
693 queue_lockdep_assert_held(q);
694 __set_bit(flag, &q->queue_flags);
695}
696
697static inline void queue_flag_clear_unlocked(unsigned int flag,
698 struct request_queue *q)
699{
700 __clear_bit(flag, &q->queue_flags);
701}
702
703static inline int queue_in_flight(struct request_queue *q)
704{
705 return q->in_flight[0] + q->in_flight[1];
706}
707
708static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
709{
710 queue_lockdep_assert_held(q);
711 __clear_bit(flag, &q->queue_flags);
712}
713
714#define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
715#define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
716#define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
717#define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
718#define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags)
719#define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
720#define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
721#define blk_queue_noxmerges(q) \
722 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
723#define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
724#define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
725#define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
726#define blk_queue_stackable(q) \
727 test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
728#define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
729#define blk_queue_secure_erase(q) \
730 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
731#define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
732#define blk_queue_scsi_passthrough(q) \
733 test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags)
734
735#define blk_noretry_request(rq) \
736 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
737 REQ_FAILFAST_DRIVER))
738#define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
739
740static inline bool blk_account_rq(struct request *rq)
741{
742 return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq);
743}
744
745#define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
746#define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
747
748#define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
749
750#define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
751
752#define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ)
753
754
755
756
757
758static inline bool queue_is_rq_based(struct request_queue *q)
759{
760 return q->request_fn || q->mq_ops;
761}
762
763static inline unsigned int blk_queue_cluster(struct request_queue *q)
764{
765 return q->limits.cluster;
766}
767
768static inline enum blk_zoned_model
769blk_queue_zoned_model(struct request_queue *q)
770{
771 return q->limits.zoned;
772}
773
774static inline bool blk_queue_is_zoned(struct request_queue *q)
775{
776 switch (blk_queue_zoned_model(q)) {
777 case BLK_ZONED_HA:
778 case BLK_ZONED_HM:
779 return true;
780 default:
781 return false;
782 }
783}
784
785static inline unsigned int blk_queue_zone_sectors(struct request_queue *q)
786{
787 return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0;
788}
789
790static inline bool rq_is_sync(struct request *rq)
791{
792 return op_is_sync(rq->cmd_flags);
793}
794
795static inline bool blk_rl_full(struct request_list *rl, bool sync)
796{
797 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
798
799 return rl->flags & flag;
800}
801
802static inline void blk_set_rl_full(struct request_list *rl, bool sync)
803{
804 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
805
806 rl->flags |= flag;
807}
808
809static inline void blk_clear_rl_full(struct request_list *rl, bool sync)
810{
811 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
812
813 rl->flags &= ~flag;
814}
815
816static inline bool rq_mergeable(struct request *rq)
817{
818 if (blk_rq_is_passthrough(rq))
819 return false;
820
821 if (req_op(rq) == REQ_OP_FLUSH)
822 return false;
823
824 if (req_op(rq) == REQ_OP_WRITE_ZEROES)
825 return false;
826
827 if (rq->cmd_flags & REQ_NOMERGE_FLAGS)
828 return false;
829 if (rq->rq_flags & RQF_NOMERGE_FLAGS)
830 return false;
831
832 return true;
833}
834
835static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b)
836{
837 if (bio_page(a) == bio_page(b) &&
838 bio_offset(a) == bio_offset(b))
839 return true;
840
841 return false;
842}
843
844static inline unsigned int blk_queue_depth(struct request_queue *q)
845{
846 if (q->queue_depth)
847 return q->queue_depth;
848
849 return q->nr_requests;
850}
851
852
853
854
855enum {
856 BLKPREP_OK,
857 BLKPREP_KILL,
858 BLKPREP_DEFER,
859 BLKPREP_INVALID,
860};
861
862extern unsigned long blk_max_low_pfn, blk_max_pfn;
863
864
865
866
867
868
869
870
871
872#if BITS_PER_LONG == 32
873#define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
874#else
875#define BLK_BOUNCE_HIGH -1ULL
876#endif
877#define BLK_BOUNCE_ANY (-1ULL)
878#define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
879
880
881
882
883#define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
884#define BLK_MIN_SG_TIMEOUT (7 * HZ)
885
886struct rq_map_data {
887 struct page **pages;
888 int page_order;
889 int nr_entries;
890 unsigned long offset;
891 int null_mapped;
892 int from_user;
893};
894
895struct req_iterator {
896 struct bvec_iter iter;
897 struct bio *bio;
898};
899
900
901#define for_each_bio(_bio) \
902 for (; _bio; _bio = _bio->bi_next)
903#define __rq_for_each_bio(_bio, rq) \
904 if ((rq->bio)) \
905 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
906
907#define rq_for_each_segment(bvl, _rq, _iter) \
908 __rq_for_each_bio(_iter.bio, _rq) \
909 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
910
911#define rq_iter_last(bvec, _iter) \
912 (_iter.bio->bi_next == NULL && \
913 bio_iter_last(bvec, _iter.iter))
914
915#ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
916# error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
917#endif
918#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
919extern void rq_flush_dcache_pages(struct request *rq);
920#else
921static inline void rq_flush_dcache_pages(struct request *rq)
922{
923}
924#endif
925
926#ifdef CONFIG_PRINTK
927#define vfs_msg(sb, level, fmt, ...) \
928 __vfs_msg(sb, level, fmt, ##__VA_ARGS__)
929#else
930#define vfs_msg(sb, level, fmt, ...) \
931do { \
932 no_printk(fmt, ##__VA_ARGS__); \
933 __vfs_msg(sb, "", " "); \
934} while (0)
935#endif
936
937extern int blk_register_queue(struct gendisk *disk);
938extern void blk_unregister_queue(struct gendisk *disk);
939extern blk_qc_t generic_make_request(struct bio *bio);
940extern void blk_rq_init(struct request_queue *q, struct request *rq);
941extern void blk_init_request_from_bio(struct request *req, struct bio *bio);
942extern void blk_put_request(struct request *);
943extern void __blk_put_request(struct request_queue *, struct request *);
944extern struct request *blk_get_request(struct request_queue *, unsigned int op,
945 gfp_t gfp_mask);
946extern void blk_requeue_request(struct request_queue *, struct request *);
947extern int blk_lld_busy(struct request_queue *q);
948extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
949 struct bio_set *bs, gfp_t gfp_mask,
950 int (*bio_ctr)(struct bio *, struct bio *, void *),
951 void *data);
952extern void blk_rq_unprep_clone(struct request *rq);
953extern blk_status_t blk_insert_cloned_request(struct request_queue *q,
954 struct request *rq);
955extern int blk_rq_append_bio(struct request *rq, struct bio *bio);
956extern void blk_delay_queue(struct request_queue *, unsigned long);
957extern void blk_queue_split(struct request_queue *, struct bio **);
958extern void blk_recount_segments(struct request_queue *, struct bio *);
959extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int);
960extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t,
961 unsigned int, void __user *);
962extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
963 unsigned int, void __user *);
964extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
965 struct scsi_ioctl_command __user *);
966
967extern int blk_queue_enter(struct request_queue *q, bool nowait);
968extern void blk_queue_exit(struct request_queue *q);
969extern void blk_start_queue(struct request_queue *q);
970extern void blk_start_queue_async(struct request_queue *q);
971extern void blk_stop_queue(struct request_queue *q);
972extern void blk_sync_queue(struct request_queue *q);
973extern void __blk_stop_queue(struct request_queue *q);
974extern void __blk_run_queue(struct request_queue *q);
975extern void __blk_run_queue_uncond(struct request_queue *q);
976extern void blk_run_queue(struct request_queue *);
977extern void blk_run_queue_async(struct request_queue *q);
978extern int blk_rq_map_user(struct request_queue *, struct request *,
979 struct rq_map_data *, void __user *, unsigned long,
980 gfp_t);
981extern int blk_rq_unmap_user(struct bio *);
982extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t);
983extern int blk_rq_map_user_iov(struct request_queue *, struct request *,
984 struct rq_map_data *, const struct iov_iter *,
985 gfp_t);
986extern void blk_execute_rq(struct request_queue *, struct gendisk *,
987 struct request *, int);
988extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
989 struct request *, int, rq_end_io_fn *);
990
991int blk_status_to_errno(blk_status_t status);
992blk_status_t errno_to_blk_status(int errno);
993
994bool blk_mq_poll(struct request_queue *q, blk_qc_t cookie);
995
996static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
997{
998 return bdev->bd_disk->queue;
999}
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009static inline sector_t blk_rq_pos(const struct request *rq)
1010{
1011 return rq->__sector;
1012}
1013
1014static inline unsigned int blk_rq_bytes(const struct request *rq)
1015{
1016 return rq->__data_len;
1017}
1018
1019static inline int blk_rq_cur_bytes(const struct request *rq)
1020{
1021 return rq->bio ? bio_cur_bytes(rq->bio) : 0;
1022}
1023
1024extern unsigned int blk_rq_err_bytes(const struct request *rq);
1025
1026static inline unsigned int blk_rq_sectors(const struct request *rq)
1027{
1028 return blk_rq_bytes(rq) >> 9;
1029}
1030
1031static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
1032{
1033 return blk_rq_cur_bytes(rq) >> 9;
1034}
1035
1036
1037
1038
1039
1040
1041
1042static inline unsigned int blk_rq_payload_bytes(struct request *rq)
1043{
1044 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1045 return rq->special_vec.bv_len;
1046 return blk_rq_bytes(rq);
1047}
1048
1049static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
1050 int op)
1051{
1052 if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE))
1053 return min(q->limits.max_discard_sectors, UINT_MAX >> 9);
1054
1055 if (unlikely(op == REQ_OP_WRITE_SAME))
1056 return q->limits.max_write_same_sectors;
1057
1058 if (unlikely(op == REQ_OP_WRITE_ZEROES))
1059 return q->limits.max_write_zeroes_sectors;
1060
1061 return q->limits.max_sectors;
1062}
1063
1064
1065
1066
1067
1068static inline unsigned int blk_max_size_offset(struct request_queue *q,
1069 sector_t offset)
1070{
1071 if (!q->limits.chunk_sectors)
1072 return q->limits.max_sectors;
1073
1074 return q->limits.chunk_sectors -
1075 (offset & (q->limits.chunk_sectors - 1));
1076}
1077
1078static inline unsigned int blk_rq_get_max_sectors(struct request *rq,
1079 sector_t offset)
1080{
1081 struct request_queue *q = rq->q;
1082
1083 if (blk_rq_is_passthrough(rq))
1084 return q->limits.max_hw_sectors;
1085
1086 if (!q->limits.chunk_sectors ||
1087 req_op(rq) == REQ_OP_DISCARD ||
1088 req_op(rq) == REQ_OP_SECURE_ERASE)
1089 return blk_queue_get_max_sectors(q, req_op(rq));
1090
1091 return min(blk_max_size_offset(q, offset),
1092 blk_queue_get_max_sectors(q, req_op(rq)));
1093}
1094
1095static inline unsigned int blk_rq_count_bios(struct request *rq)
1096{
1097 unsigned int nr_bios = 0;
1098 struct bio *bio;
1099
1100 __rq_for_each_bio(bio, rq)
1101 nr_bios++;
1102
1103 return nr_bios;
1104}
1105
1106
1107
1108
1109extern struct request *blk_peek_request(struct request_queue *q);
1110extern void blk_start_request(struct request *rq);
1111extern struct request *blk_fetch_request(struct request_queue *q);
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126extern bool blk_update_request(struct request *rq, blk_status_t error,
1127 unsigned int nr_bytes);
1128extern void blk_finish_request(struct request *rq, blk_status_t error);
1129extern bool blk_end_request(struct request *rq, blk_status_t error,
1130 unsigned int nr_bytes);
1131extern void blk_end_request_all(struct request *rq, blk_status_t error);
1132extern bool __blk_end_request(struct request *rq, blk_status_t error,
1133 unsigned int nr_bytes);
1134extern void __blk_end_request_all(struct request *rq, blk_status_t error);
1135extern bool __blk_end_request_cur(struct request *rq, blk_status_t error);
1136
1137extern void blk_complete_request(struct request *);
1138extern void __blk_complete_request(struct request *);
1139extern void blk_abort_request(struct request *);
1140extern void blk_unprep_request(struct request *);
1141
1142
1143
1144
1145extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn,
1146 spinlock_t *lock, int node_id);
1147extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *);
1148extern int blk_init_allocated_queue(struct request_queue *);
1149extern void blk_cleanup_queue(struct request_queue *);
1150extern void blk_queue_make_request(struct request_queue *, make_request_fn *);
1151extern void blk_queue_bounce_limit(struct request_queue *, u64);
1152extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
1153extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
1154extern void blk_queue_max_segments(struct request_queue *, unsigned short);
1155extern void blk_queue_max_discard_segments(struct request_queue *,
1156 unsigned short);
1157extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
1158extern void blk_queue_max_discard_sectors(struct request_queue *q,
1159 unsigned int max_discard_sectors);
1160extern void blk_queue_max_write_same_sectors(struct request_queue *q,
1161 unsigned int max_write_same_sectors);
1162extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
1163 unsigned int max_write_same_sectors);
1164extern void blk_queue_logical_block_size(struct request_queue *, unsigned short);
1165extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
1166extern void blk_queue_alignment_offset(struct request_queue *q,
1167 unsigned int alignment);
1168extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
1169extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
1170extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
1171extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
1172extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
1173extern void blk_set_default_limits(struct queue_limits *lim);
1174extern void blk_set_stacking_limits(struct queue_limits *lim);
1175extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
1176 sector_t offset);
1177extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev,
1178 sector_t offset);
1179extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
1180 sector_t offset);
1181extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b);
1182extern void blk_queue_dma_pad(struct request_queue *, unsigned int);
1183extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
1184extern int blk_queue_dma_drain(struct request_queue *q,
1185 dma_drain_needed_fn *dma_drain_needed,
1186 void *buf, unsigned int size);
1187extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn);
1188extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
1189extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
1190extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn);
1191extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn);
1192extern void blk_queue_dma_alignment(struct request_queue *, int);
1193extern void blk_queue_update_dma_alignment(struct request_queue *, int);
1194extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *);
1195extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *);
1196extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
1197extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable);
1198extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209static inline unsigned short blk_rq_nr_phys_segments(struct request *rq)
1210{
1211 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1212 return 1;
1213 return rq->nr_phys_segments;
1214}
1215
1216
1217
1218
1219
1220static inline unsigned short blk_rq_nr_discard_segments(struct request *rq)
1221{
1222 return max_t(unsigned short, rq->nr_phys_segments, 1);
1223}
1224
1225extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *);
1226extern void blk_dump_rq_flags(struct request *, char *);
1227extern long nr_blockdev_pages(void);
1228
1229bool __must_check blk_get_queue(struct request_queue *);
1230struct request_queue *blk_alloc_queue(gfp_t);
1231struct request_queue *blk_alloc_queue_node(gfp_t, int);
1232extern void blk_put_queue(struct request_queue *);
1233extern void blk_set_queue_dying(struct request_queue *);
1234
1235
1236
1237
1238#ifdef CONFIG_PM
1239extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev);
1240extern int blk_pre_runtime_suspend(struct request_queue *q);
1241extern void blk_post_runtime_suspend(struct request_queue *q, int err);
1242extern void blk_pre_runtime_resume(struct request_queue *q);
1243extern void blk_post_runtime_resume(struct request_queue *q, int err);
1244extern void blk_set_runtime_active(struct request_queue *q);
1245#else
1246static inline void blk_pm_runtime_init(struct request_queue *q,
1247 struct device *dev) {}
1248static inline int blk_pre_runtime_suspend(struct request_queue *q)
1249{
1250 return -ENOSYS;
1251}
1252static inline void blk_post_runtime_suspend(struct request_queue *q, int err) {}
1253static inline void blk_pre_runtime_resume(struct request_queue *q) {}
1254static inline void blk_post_runtime_resume(struct request_queue *q, int err) {}
1255static inline void blk_set_runtime_active(struct request_queue *q) {}
1256#endif
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270struct blk_plug {
1271 struct list_head list;
1272 struct list_head mq_list;
1273 struct list_head cb_list;
1274};
1275#define BLK_MAX_REQUEST_COUNT 16
1276#define BLK_PLUG_FLUSH_SIZE (128 * 1024)
1277
1278struct blk_plug_cb;
1279typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
1280struct blk_plug_cb {
1281 struct list_head list;
1282 blk_plug_cb_fn callback;
1283 void *data;
1284};
1285extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
1286 void *data, int size);
1287extern void blk_start_plug(struct blk_plug *);
1288extern void blk_finish_plug(struct blk_plug *);
1289extern void blk_flush_plug_list(struct blk_plug *, bool);
1290
1291static inline void blk_flush_plug(struct task_struct *tsk)
1292{
1293 struct blk_plug *plug = tsk->plug;
1294
1295 if (plug)
1296 blk_flush_plug_list(plug, false);
1297}
1298
1299static inline void blk_schedule_flush_plug(struct task_struct *tsk)
1300{
1301 struct blk_plug *plug = tsk->plug;
1302
1303 if (plug)
1304 blk_flush_plug_list(plug, true);
1305}
1306
1307static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1308{
1309 struct blk_plug *plug = tsk->plug;
1310
1311 return plug &&
1312 (!list_empty(&plug->list) ||
1313 !list_empty(&plug->mq_list) ||
1314 !list_empty(&plug->cb_list));
1315}
1316
1317
1318
1319
1320extern int blk_queue_start_tag(struct request_queue *, struct request *);
1321extern struct request *blk_queue_find_tag(struct request_queue *, int);
1322extern void blk_queue_end_tag(struct request_queue *, struct request *);
1323extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *, int);
1324extern void blk_queue_free_tags(struct request_queue *);
1325extern int blk_queue_resize_tags(struct request_queue *, int);
1326extern void blk_queue_invalidate_tags(struct request_queue *);
1327extern struct blk_queue_tag *blk_init_tags(int, int);
1328extern void blk_free_tags(struct blk_queue_tag *);
1329
1330static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt,
1331 int tag)
1332{
1333 if (unlikely(bqt == NULL || tag >= bqt->real_max_depth))
1334 return NULL;
1335 return bqt->tag_index[tag];
1336}
1337
1338extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *);
1339extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
1340 sector_t nr_sects, gfp_t gfp_mask, struct page *page);
1341
1342#define BLKDEV_DISCARD_SECURE (1 << 0)
1343
1344extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1345 sector_t nr_sects, gfp_t gfp_mask, unsigned long flags);
1346extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1347 sector_t nr_sects, gfp_t gfp_mask, int flags,
1348 struct bio **biop);
1349
1350#define BLKDEV_ZERO_NOUNMAP (1 << 0)
1351#define BLKDEV_ZERO_NOFALLBACK (1 << 1)
1352
1353extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1354 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
1355 unsigned flags);
1356extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1357 sector_t nr_sects, gfp_t gfp_mask, unsigned flags);
1358
1359static inline int sb_issue_discard(struct super_block *sb, sector_t block,
1360 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
1361{
1362 return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9),
1363 nr_blocks << (sb->s_blocksize_bits - 9),
1364 gfp_mask, flags);
1365}
1366static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
1367 sector_t nr_blocks, gfp_t gfp_mask)
1368{
1369 return blkdev_issue_zeroout(sb->s_bdev,
1370 block << (sb->s_blocksize_bits - 9),
1371 nr_blocks << (sb->s_blocksize_bits - 9),
1372 gfp_mask, 0);
1373}
1374
1375extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm);
1376
1377enum blk_default_limits {
1378 BLK_MAX_SEGMENTS = 128,
1379 BLK_SAFE_MAX_SECTORS = 255,
1380 BLK_DEF_MAX_SECTORS = 2560,
1381 BLK_MAX_SEGMENT_SIZE = 65536,
1382 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
1383};
1384
1385#define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
1386
1387static inline unsigned long queue_segment_boundary(struct request_queue *q)
1388{
1389 return q->limits.seg_boundary_mask;
1390}
1391
1392static inline unsigned long queue_virt_boundary(struct request_queue *q)
1393{
1394 return q->limits.virt_boundary_mask;
1395}
1396
1397static inline unsigned int queue_max_sectors(struct request_queue *q)
1398{
1399 return q->limits.max_sectors;
1400}
1401
1402static inline unsigned int queue_max_hw_sectors(struct request_queue *q)
1403{
1404 return q->limits.max_hw_sectors;
1405}
1406
1407static inline unsigned short queue_max_segments(struct request_queue *q)
1408{
1409 return q->limits.max_segments;
1410}
1411
1412static inline unsigned short queue_max_discard_segments(struct request_queue *q)
1413{
1414 return q->limits.max_discard_segments;
1415}
1416
1417static inline unsigned int queue_max_segment_size(struct request_queue *q)
1418{
1419 return q->limits.max_segment_size;
1420}
1421
1422static inline unsigned short queue_logical_block_size(struct request_queue *q)
1423{
1424 int retval = 512;
1425
1426 if (q && q->limits.logical_block_size)
1427 retval = q->limits.logical_block_size;
1428
1429 return retval;
1430}
1431
1432static inline unsigned short bdev_logical_block_size(struct block_device *bdev)
1433{
1434 return queue_logical_block_size(bdev_get_queue(bdev));
1435}
1436
1437static inline unsigned int queue_physical_block_size(struct request_queue *q)
1438{
1439 return q->limits.physical_block_size;
1440}
1441
1442static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
1443{
1444 return queue_physical_block_size(bdev_get_queue(bdev));
1445}
1446
1447static inline unsigned int queue_io_min(struct request_queue *q)
1448{
1449 return q->limits.io_min;
1450}
1451
1452static inline int bdev_io_min(struct block_device *bdev)
1453{
1454 return queue_io_min(bdev_get_queue(bdev));
1455}
1456
1457static inline unsigned int queue_io_opt(struct request_queue *q)
1458{
1459 return q->limits.io_opt;
1460}
1461
1462static inline int bdev_io_opt(struct block_device *bdev)
1463{
1464 return queue_io_opt(bdev_get_queue(bdev));
1465}
1466
1467static inline int queue_alignment_offset(struct request_queue *q)
1468{
1469 if (q->limits.misaligned)
1470 return -1;
1471
1472 return q->limits.alignment_offset;
1473}
1474
1475static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector)
1476{
1477 unsigned int granularity = max(lim->physical_block_size, lim->io_min);
1478 unsigned int alignment = sector_div(sector, granularity >> 9) << 9;
1479
1480 return (granularity + lim->alignment_offset - alignment) % granularity;
1481}
1482
1483static inline int bdev_alignment_offset(struct block_device *bdev)
1484{
1485 struct request_queue *q = bdev_get_queue(bdev);
1486
1487 if (q->limits.misaligned)
1488 return -1;
1489
1490 if (bdev != bdev->bd_contains)
1491 return bdev->bd_part->alignment_offset;
1492
1493 return q->limits.alignment_offset;
1494}
1495
1496static inline int queue_discard_alignment(struct request_queue *q)
1497{
1498 if (q->limits.discard_misaligned)
1499 return -1;
1500
1501 return q->limits.discard_alignment;
1502}
1503
1504static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector)
1505{
1506 unsigned int alignment, granularity, offset;
1507
1508 if (!lim->max_discard_sectors)
1509 return 0;
1510
1511
1512 alignment = lim->discard_alignment >> 9;
1513 granularity = lim->discard_granularity >> 9;
1514 if (!granularity)
1515 return 0;
1516
1517
1518 offset = sector_div(sector, granularity);
1519
1520
1521 offset = (granularity + alignment - offset) % granularity;
1522
1523
1524 return offset << 9;
1525}
1526
1527static inline int bdev_discard_alignment(struct block_device *bdev)
1528{
1529 struct request_queue *q = bdev_get_queue(bdev);
1530
1531 if (bdev != bdev->bd_contains)
1532 return bdev->bd_part->discard_alignment;
1533
1534 return q->limits.discard_alignment;
1535}
1536
1537static inline unsigned int bdev_write_same(struct block_device *bdev)
1538{
1539 struct request_queue *q = bdev_get_queue(bdev);
1540
1541 if (q)
1542 return q->limits.max_write_same_sectors;
1543
1544 return 0;
1545}
1546
1547static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
1548{
1549 struct request_queue *q = bdev_get_queue(bdev);
1550
1551 if (q)
1552 return q->limits.max_write_zeroes_sectors;
1553
1554 return 0;
1555}
1556
1557static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev)
1558{
1559 struct request_queue *q = bdev_get_queue(bdev);
1560
1561 if (q)
1562 return blk_queue_zoned_model(q);
1563
1564 return BLK_ZONED_NONE;
1565}
1566
1567static inline bool bdev_is_zoned(struct block_device *bdev)
1568{
1569 struct request_queue *q = bdev_get_queue(bdev);
1570
1571 if (q)
1572 return blk_queue_is_zoned(q);
1573
1574 return false;
1575}
1576
1577static inline unsigned int bdev_zone_sectors(struct block_device *bdev)
1578{
1579 struct request_queue *q = bdev_get_queue(bdev);
1580
1581 if (q)
1582 return blk_queue_zone_sectors(q);
1583
1584 return 0;
1585}
1586
1587static inline int queue_dma_alignment(struct request_queue *q)
1588{
1589 return q ? q->dma_alignment : 511;
1590}
1591
1592static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
1593 unsigned int len)
1594{
1595 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
1596 return !(addr & alignment) && !(len & alignment);
1597}
1598
1599
1600static inline unsigned int blksize_bits(unsigned int size)
1601{
1602 unsigned int bits = 8;
1603 do {
1604 bits++;
1605 size >>= 1;
1606 } while (size > 256);
1607 return bits;
1608}
1609
1610static inline unsigned int block_size(struct block_device *bdev)
1611{
1612 return bdev->bd_block_size;
1613}
1614
1615static inline bool queue_flush_queueable(struct request_queue *q)
1616{
1617 return !test_bit(QUEUE_FLAG_FLUSH_NQ, &q->queue_flags);
1618}
1619
1620typedef struct {struct page *v;} Sector;
1621
1622unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *);
1623
1624static inline void put_dev_sector(Sector p)
1625{
1626 put_page(p.v);
1627}
1628
1629static inline bool __bvec_gap_to_prev(struct request_queue *q,
1630 struct bio_vec *bprv, unsigned int offset)
1631{
1632 return offset ||
1633 ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
1634}
1635
1636
1637
1638
1639
1640static inline bool bvec_gap_to_prev(struct request_queue *q,
1641 struct bio_vec *bprv, unsigned int offset)
1642{
1643 if (!queue_virt_boundary(q))
1644 return false;
1645 return __bvec_gap_to_prev(q, bprv, offset);
1646}
1647
1648
1649
1650
1651
1652
1653static inline bool bios_segs_mergeable(struct request_queue *q,
1654 struct bio *prev, struct bio_vec *prev_last_bv,
1655 struct bio_vec *next_first_bv)
1656{
1657 if (!BIOVEC_PHYS_MERGEABLE(prev_last_bv, next_first_bv))
1658 return false;
1659 if (!BIOVEC_SEG_BOUNDARY(q, prev_last_bv, next_first_bv))
1660 return false;
1661 if (prev->bi_seg_back_size + next_first_bv->bv_len >
1662 queue_max_segment_size(q))
1663 return false;
1664 return true;
1665}
1666
1667static inline bool bio_will_gap(struct request_queue *q,
1668 struct request *prev_rq,
1669 struct bio *prev,
1670 struct bio *next)
1671{
1672 if (bio_has_data(prev) && queue_virt_boundary(q)) {
1673 struct bio_vec pb, nb;
1674
1675
1676
1677
1678
1679
1680
1681 if (prev_rq)
1682 bio_get_first_bvec(prev_rq->bio, &pb);
1683 else
1684 bio_get_first_bvec(prev, &pb);
1685 if (pb.bv_offset)
1686 return true;
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697 bio_get_last_bvec(prev, &pb);
1698 bio_get_first_bvec(next, &nb);
1699
1700 if (!bios_segs_mergeable(q, prev, &pb, &nb))
1701 return __bvec_gap_to_prev(q, &pb, nb.bv_offset);
1702 }
1703
1704 return false;
1705}
1706
1707static inline bool req_gap_back_merge(struct request *req, struct bio *bio)
1708{
1709 return bio_will_gap(req->q, req, req->biotail, bio);
1710}
1711
1712static inline bool req_gap_front_merge(struct request *req, struct bio *bio)
1713{
1714 return bio_will_gap(req->q, NULL, bio, req->bio);
1715}
1716
1717int kblockd_schedule_work(struct work_struct *work);
1718int kblockd_schedule_work_on(int cpu, struct work_struct *work);
1719int kblockd_schedule_delayed_work(struct delayed_work *dwork, unsigned long delay);
1720int kblockd_schedule_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
1721int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
1722
1723#ifdef CONFIG_BLK_CGROUP
1724
1725
1726
1727
1728
1729static inline void set_start_time_ns(struct request *req)
1730{
1731 preempt_disable();
1732 req->start_time_ns = sched_clock();
1733 preempt_enable();
1734}
1735
1736static inline void set_io_start_time_ns(struct request *req)
1737{
1738 preempt_disable();
1739 req->io_start_time_ns = sched_clock();
1740 preempt_enable();
1741}
1742
1743static inline uint64_t rq_start_time_ns(struct request *req)
1744{
1745 return req->start_time_ns;
1746}
1747
1748static inline uint64_t rq_io_start_time_ns(struct request *req)
1749{
1750 return req->io_start_time_ns;
1751}
1752#else
1753static inline void set_start_time_ns(struct request *req) {}
1754static inline void set_io_start_time_ns(struct request *req) {}
1755static inline uint64_t rq_start_time_ns(struct request *req)
1756{
1757 return 0;
1758}
1759static inline uint64_t rq_io_start_time_ns(struct request *req)
1760{
1761 return 0;
1762}
1763#endif
1764
1765#define MODULE_ALIAS_BLOCKDEV(major,minor) \
1766 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1767#define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1768 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1769
1770#if defined(CONFIG_BLK_DEV_INTEGRITY)
1771
1772enum blk_integrity_flags {
1773 BLK_INTEGRITY_VERIFY = 1 << 0,
1774 BLK_INTEGRITY_GENERATE = 1 << 1,
1775 BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2,
1776 BLK_INTEGRITY_IP_CHECKSUM = 1 << 3,
1777};
1778
1779struct blk_integrity_iter {
1780 void *prot_buf;
1781 void *data_buf;
1782 sector_t seed;
1783 unsigned int data_size;
1784 unsigned short interval;
1785 const char *disk_name;
1786};
1787
1788typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *);
1789
1790struct blk_integrity_profile {
1791 integrity_processing_fn *generate_fn;
1792 integrity_processing_fn *verify_fn;
1793 const char *name;
1794};
1795
1796extern void blk_integrity_register(struct gendisk *, struct blk_integrity *);
1797extern void blk_integrity_unregister(struct gendisk *);
1798extern int blk_integrity_compare(struct gendisk *, struct gendisk *);
1799extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *,
1800 struct scatterlist *);
1801extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *);
1802extern bool blk_integrity_merge_rq(struct request_queue *, struct request *,
1803 struct request *);
1804extern bool blk_integrity_merge_bio(struct request_queue *, struct request *,
1805 struct bio *);
1806
1807static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1808{
1809 struct blk_integrity *bi = &disk->queue->integrity;
1810
1811 if (!bi->profile)
1812 return NULL;
1813
1814 return bi;
1815}
1816
1817static inline
1818struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
1819{
1820 return blk_get_integrity(bdev->bd_disk);
1821}
1822
1823static inline bool blk_integrity_rq(struct request *rq)
1824{
1825 return rq->cmd_flags & REQ_INTEGRITY;
1826}
1827
1828static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1829 unsigned int segs)
1830{
1831 q->limits.max_integrity_segments = segs;
1832}
1833
1834static inline unsigned short
1835queue_max_integrity_segments(struct request_queue *q)
1836{
1837 return q->limits.max_integrity_segments;
1838}
1839
1840static inline bool integrity_req_gap_back_merge(struct request *req,
1841 struct bio *next)
1842{
1843 struct bio_integrity_payload *bip = bio_integrity(req->bio);
1844 struct bio_integrity_payload *bip_next = bio_integrity(next);
1845
1846 return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
1847 bip_next->bip_vec[0].bv_offset);
1848}
1849
1850static inline bool integrity_req_gap_front_merge(struct request *req,
1851 struct bio *bio)
1852{
1853 struct bio_integrity_payload *bip = bio_integrity(bio);
1854 struct bio_integrity_payload *bip_next = bio_integrity(req->bio);
1855
1856 return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
1857 bip_next->bip_vec[0].bv_offset);
1858}
1859
1860#else
1861
1862struct bio;
1863struct block_device;
1864struct gendisk;
1865struct blk_integrity;
1866
1867static inline int blk_integrity_rq(struct request *rq)
1868{
1869 return 0;
1870}
1871static inline int blk_rq_count_integrity_sg(struct request_queue *q,
1872 struct bio *b)
1873{
1874 return 0;
1875}
1876static inline int blk_rq_map_integrity_sg(struct request_queue *q,
1877 struct bio *b,
1878 struct scatterlist *s)
1879{
1880 return 0;
1881}
1882static inline struct blk_integrity *bdev_get_integrity(struct block_device *b)
1883{
1884 return NULL;
1885}
1886static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1887{
1888 return NULL;
1889}
1890static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b)
1891{
1892 return 0;
1893}
1894static inline void blk_integrity_register(struct gendisk *d,
1895 struct blk_integrity *b)
1896{
1897}
1898static inline void blk_integrity_unregister(struct gendisk *d)
1899{
1900}
1901static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1902 unsigned int segs)
1903{
1904}
1905static inline unsigned short queue_max_integrity_segments(struct request_queue *q)
1906{
1907 return 0;
1908}
1909static inline bool blk_integrity_merge_rq(struct request_queue *rq,
1910 struct request *r1,
1911 struct request *r2)
1912{
1913 return true;
1914}
1915static inline bool blk_integrity_merge_bio(struct request_queue *rq,
1916 struct request *r,
1917 struct bio *b)
1918{
1919 return true;
1920}
1921
1922static inline bool integrity_req_gap_back_merge(struct request *req,
1923 struct bio *next)
1924{
1925 return false;
1926}
1927static inline bool integrity_req_gap_front_merge(struct request *req,
1928 struct bio *bio)
1929{
1930 return false;
1931}
1932
1933#endif
1934
1935struct block_device_operations {
1936 int (*open) (struct block_device *, fmode_t);
1937 void (*release) (struct gendisk *, fmode_t);
1938 int (*rw_page)(struct block_device *, sector_t, struct page *, bool);
1939 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1940 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1941 unsigned int (*check_events) (struct gendisk *disk,
1942 unsigned int clearing);
1943
1944 int (*media_changed) (struct gendisk *);
1945 void (*unlock_native_capacity) (struct gendisk *);
1946 int (*revalidate_disk) (struct gendisk *);
1947 int (*getgeo)(struct block_device *, struct hd_geometry *);
1948
1949 void (*swap_slot_free_notify) (struct block_device *, unsigned long);
1950 struct module *owner;
1951 const struct pr_ops *pr_ops;
1952};
1953
1954extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int,
1955 unsigned long);
1956extern int bdev_read_page(struct block_device *, sector_t, struct page *);
1957extern int bdev_write_page(struct block_device *, sector_t, struct page *,
1958 struct writeback_control *);
1959#else
1960
1961struct block_device;
1962
1963
1964
1965
1966#define buffer_heads_over_limit 0
1967
1968static inline long nr_blockdev_pages(void)
1969{
1970 return 0;
1971}
1972
1973struct blk_plug {
1974};
1975
1976static inline void blk_start_plug(struct blk_plug *plug)
1977{
1978}
1979
1980static inline void blk_finish_plug(struct blk_plug *plug)
1981{
1982}
1983
1984static inline void blk_flush_plug(struct task_struct *task)
1985{
1986}
1987
1988static inline void blk_schedule_flush_plug(struct task_struct *task)
1989{
1990}
1991
1992
1993static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1994{
1995 return false;
1996}
1997
1998static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask,
1999 sector_t *error_sector)
2000{
2001 return 0;
2002}
2003
2004#endif
2005
2006#endif
2007