1
2#ifndef _LINUX_BLKDEV_H
3#define _LINUX_BLKDEV_H
4
5#include <linux/sched.h>
6#include <linux/sched/clock.h>
7
8#ifdef CONFIG_BLOCK
9
10#include <linux/major.h>
11#include <linux/genhd.h>
12#include <linux/list.h>
13#include <linux/llist.h>
14#include <linux/timer.h>
15#include <linux/workqueue.h>
16#include <linux/pagemap.h>
17#include <linux/backing-dev-defs.h>
18#include <linux/wait.h>
19#include <linux/mempool.h>
20#include <linux/pfn.h>
21#include <linux/bio.h>
22#include <linux/stringify.h>
23#include <linux/gfp.h>
24#include <linux/bsg.h>
25#include <linux/smp.h>
26#include <linux/rcupdate.h>
27#include <linux/percpu-refcount.h>
28#include <linux/scatterlist.h>
29#include <linux/blkzoned.h>
30
31struct module;
32struct scsi_ioctl_command;
33
34struct request_queue;
35struct elevator_queue;
36struct blk_trace;
37struct request;
38struct sg_io_hdr;
39struct bsg_job;
40struct blkcg_gq;
41struct blk_flush_queue;
42struct pr_ops;
43struct rq_qos;
44struct blk_queue_stats;
45struct blk_stat_callback;
46
47#define BLKDEV_MIN_RQ 4
48#define BLKDEV_MAX_RQ 128
49
50
51#define BLK_MQ_POLL_STATS_BKTS 16
52
53
54#define BLK_MQ_POLL_CLASSIC -1
55
56
57
58
59
60#define BLKCG_MAX_POLS 5
61
62typedef void (rq_end_io_fn)(struct request *, blk_status_t);
63
64
65
66typedef __u32 __bitwise req_flags_t;
67
68
69#define RQF_SORTED ((__force req_flags_t)(1 << 0))
70
71#define RQF_STARTED ((__force req_flags_t)(1 << 1))
72
73#define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3))
74
75#define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4))
76
77#define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5))
78
79#define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6))
80
81#define RQF_DONTPREP ((__force req_flags_t)(1 << 7))
82
83
84#define RQF_PREEMPT ((__force req_flags_t)(1 << 8))
85
86#define RQF_COPY_USER ((__force req_flags_t)(1 << 9))
87
88#define RQF_FAILED ((__force req_flags_t)(1 << 10))
89
90#define RQF_QUIET ((__force req_flags_t)(1 << 11))
91
92#define RQF_ELVPRIV ((__force req_flags_t)(1 << 12))
93
94#define RQF_IO_STAT ((__force req_flags_t)(1 << 13))
95
96#define RQF_ALLOCED ((__force req_flags_t)(1 << 14))
97
98#define RQF_PM ((__force req_flags_t)(1 << 15))
99
100#define RQF_HASHED ((__force req_flags_t)(1 << 16))
101
102#define RQF_STATS ((__force req_flags_t)(1 << 17))
103
104
105#define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18))
106
107#define RQF_ZONE_WRITE_LOCKED ((__force req_flags_t)(1 << 19))
108
109#define RQF_MQ_POLL_SLEPT ((__force req_flags_t)(1 << 20))
110
111#define RQF_TIMED_OUT ((__force req_flags_t)(1 << 21))
112
113
114#define RQF_NOMERGE_FLAGS \
115 (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD)
116
117
118
119
120enum mq_rq_state {
121 MQ_RQ_IDLE = 0,
122 MQ_RQ_IN_FLIGHT = 1,
123 MQ_RQ_COMPLETE = 2,
124};
125
126
127
128
129
130
131
132struct request {
133 struct request_queue *q;
134 struct blk_mq_ctx *mq_ctx;
135 struct blk_mq_hw_ctx *mq_hctx;
136
137 unsigned int cmd_flags;
138 req_flags_t rq_flags;
139
140 int tag;
141 int internal_tag;
142
143
144 unsigned int __data_len;
145 sector_t __sector;
146
147 struct bio *bio;
148 struct bio *biotail;
149
150 struct list_head queuelist;
151
152
153
154
155
156
157
158
159 union {
160 struct hlist_node hash;
161 struct list_head ipi_list;
162 };
163
164
165
166
167
168
169 union {
170 struct rb_node rb_node;
171 struct bio_vec special_vec;
172 void *completion_data;
173 int error_count;
174 };
175
176
177
178
179
180
181
182 union {
183 struct {
184 struct io_cq *icq;
185 void *priv[2];
186 } elv;
187
188 struct {
189 unsigned int seq;
190 struct list_head list;
191 rq_end_io_fn *saved_end_io;
192 } flush;
193 };
194
195 struct gendisk *rq_disk;
196 struct hd_struct *part;
197
198 u64 start_time_ns;
199
200 u64 io_start_time_ns;
201
202#ifdef CONFIG_BLK_WBT
203 unsigned short wbt_flags;
204#endif
205#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
206 unsigned short throtl_size;
207#endif
208
209
210
211
212
213 unsigned short nr_phys_segments;
214
215#if defined(CONFIG_BLK_DEV_INTEGRITY)
216 unsigned short nr_integrity_segments;
217#endif
218
219 unsigned short write_hint;
220 unsigned short ioprio;
221
222 unsigned int extra_len;
223
224 enum mq_rq_state state;
225 refcount_t ref;
226
227 unsigned int timeout;
228 unsigned long deadline;
229
230 union {
231 struct __call_single_data csd;
232 u64 fifo_time;
233 };
234
235
236
237
238 rq_end_io_fn *end_io;
239 void *end_io_data;
240};
241
242static inline bool blk_op_is_scsi(unsigned int op)
243{
244 return op == REQ_OP_SCSI_IN || op == REQ_OP_SCSI_OUT;
245}
246
247static inline bool blk_op_is_private(unsigned int op)
248{
249 return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT;
250}
251
252static inline bool blk_rq_is_scsi(struct request *rq)
253{
254 return blk_op_is_scsi(req_op(rq));
255}
256
257static inline bool blk_rq_is_private(struct request *rq)
258{
259 return blk_op_is_private(req_op(rq));
260}
261
262static inline bool blk_rq_is_passthrough(struct request *rq)
263{
264 return blk_rq_is_scsi(rq) || blk_rq_is_private(rq);
265}
266
267static inline bool bio_is_passthrough(struct bio *bio)
268{
269 unsigned op = bio_op(bio);
270
271 return blk_op_is_scsi(op) || blk_op_is_private(op);
272}
273
274static inline unsigned short req_get_ioprio(struct request *req)
275{
276 return req->ioprio;
277}
278
279#include <linux/elevator.h>
280
281struct blk_queue_ctx;
282
283typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio);
284
285struct bio_vec;
286typedef int (dma_drain_needed_fn)(struct request *);
287
288enum blk_eh_timer_return {
289 BLK_EH_DONE,
290 BLK_EH_RESET_TIMER,
291};
292
293enum blk_queue_state {
294 Queue_down,
295 Queue_up,
296};
297
298#define BLK_TAG_ALLOC_FIFO 0
299#define BLK_TAG_ALLOC_RR 1
300
301#define BLK_SCSI_MAX_CMDS (256)
302#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
303
304
305
306
307enum blk_zoned_model {
308 BLK_ZONED_NONE,
309 BLK_ZONED_HA,
310 BLK_ZONED_HM,
311};
312
313struct queue_limits {
314 unsigned long bounce_pfn;
315 unsigned long seg_boundary_mask;
316 unsigned long virt_boundary_mask;
317
318 unsigned int max_hw_sectors;
319 unsigned int max_dev_sectors;
320 unsigned int chunk_sectors;
321 unsigned int max_sectors;
322 unsigned int max_segment_size;
323 unsigned int physical_block_size;
324 unsigned int alignment_offset;
325 unsigned int io_min;
326 unsigned int io_opt;
327 unsigned int max_discard_sectors;
328 unsigned int max_hw_discard_sectors;
329 unsigned int max_write_same_sectors;
330 unsigned int max_write_zeroes_sectors;
331 unsigned int discard_granularity;
332 unsigned int discard_alignment;
333
334 unsigned short logical_block_size;
335 unsigned short max_segments;
336 unsigned short max_integrity_segments;
337 unsigned short max_discard_segments;
338
339 unsigned char misaligned;
340 unsigned char discard_misaligned;
341 unsigned char raid_partial_stripes_expensive;
342 enum blk_zoned_model zoned;
343};
344
345#ifdef CONFIG_BLK_DEV_ZONED
346
347
348
349
350#define BLK_ZONED_REPORT_MAX_ZONES 8192U
351
352extern unsigned int blkdev_nr_zones(struct block_device *bdev);
353extern int blkdev_report_zones(struct block_device *bdev,
354 sector_t sector, struct blk_zone *zones,
355 unsigned int *nr_zones);
356extern int blkdev_reset_zones(struct block_device *bdev, sector_t sectors,
357 sector_t nr_sectors, gfp_t gfp_mask);
358extern int blk_revalidate_disk_zones(struct gendisk *disk);
359
360extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
361 unsigned int cmd, unsigned long arg);
362extern int blkdev_reset_zones_ioctl(struct block_device *bdev, fmode_t mode,
363 unsigned int cmd, unsigned long arg);
364
365#else
366
367static inline unsigned int blkdev_nr_zones(struct block_device *bdev)
368{
369 return 0;
370}
371
372static inline int blk_revalidate_disk_zones(struct gendisk *disk)
373{
374 return 0;
375}
376
377static inline int blkdev_report_zones_ioctl(struct block_device *bdev,
378 fmode_t mode, unsigned int cmd,
379 unsigned long arg)
380{
381 return -ENOTTY;
382}
383
384static inline int blkdev_reset_zones_ioctl(struct block_device *bdev,
385 fmode_t mode, unsigned int cmd,
386 unsigned long arg)
387{
388 return -ENOTTY;
389}
390
391#endif
392
393struct request_queue {
394
395
396
397 struct list_head queue_head;
398 struct request *last_merge;
399 struct elevator_queue *elevator;
400
401 struct blk_queue_stats *stats;
402 struct rq_qos *rq_qos;
403
404 make_request_fn *make_request_fn;
405 dma_drain_needed_fn *dma_drain_needed;
406
407 const struct blk_mq_ops *mq_ops;
408
409
410 struct blk_mq_ctx __percpu *queue_ctx;
411 unsigned int nr_queues;
412
413 unsigned int queue_depth;
414
415
416 struct blk_mq_hw_ctx **queue_hw_ctx;
417 unsigned int nr_hw_queues;
418
419 struct backing_dev_info *backing_dev_info;
420
421
422
423
424
425 void *queuedata;
426
427
428
429
430 unsigned long queue_flags;
431
432
433
434
435
436 atomic_t pm_only;
437
438
439
440
441
442 int id;
443
444
445
446
447 gfp_t bounce_gfp;
448
449 spinlock_t queue_lock;
450
451
452
453
454 struct kobject kobj;
455
456
457
458
459 struct kobject *mq_kobj;
460
461#ifdef CONFIG_BLK_DEV_INTEGRITY
462 struct blk_integrity integrity;
463#endif
464
465#ifdef CONFIG_PM
466 struct device *dev;
467 int rpm_status;
468 unsigned int nr_pending;
469#endif
470
471
472
473
474 unsigned long nr_requests;
475
476 unsigned int dma_drain_size;
477 void *dma_drain_buffer;
478 unsigned int dma_pad_mask;
479 unsigned int dma_alignment;
480
481 unsigned int rq_timeout;
482 int poll_nsec;
483
484 struct blk_stat_callback *poll_cb;
485 struct blk_rq_stat poll_stat[BLK_MQ_POLL_STATS_BKTS];
486
487 struct timer_list timeout;
488 struct work_struct timeout_work;
489
490 struct list_head icq_list;
491#ifdef CONFIG_BLK_CGROUP
492 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
493 struct blkcg_gq *root_blkg;
494 struct list_head blkg_list;
495#endif
496
497 struct queue_limits limits;
498
499#ifdef CONFIG_BLK_DEV_ZONED
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517 unsigned int nr_zones;
518 unsigned long *seq_zones_bitmap;
519 unsigned long *seq_zones_wlock;
520#endif
521
522
523
524
525 unsigned int sg_timeout;
526 unsigned int sg_reserved_size;
527 int node;
528#ifdef CONFIG_BLK_DEV_IO_TRACE
529 struct blk_trace *blk_trace;
530 struct mutex blk_trace_mutex;
531#endif
532
533
534
535 struct blk_flush_queue *fq;
536
537 struct list_head requeue_list;
538 spinlock_t requeue_lock;
539 struct delayed_work requeue_work;
540
541 struct mutex sysfs_lock;
542
543
544
545
546
547 struct list_head unused_hctx_list;
548 spinlock_t unused_hctx_lock;
549
550 int mq_freeze_depth;
551
552#if defined(CONFIG_BLK_DEV_BSG)
553 struct bsg_class_device bsg_dev;
554#endif
555
556#ifdef CONFIG_BLK_DEV_THROTTLING
557
558 struct throtl_data *td;
559#endif
560 struct rcu_head rcu_head;
561 wait_queue_head_t mq_freeze_wq;
562
563
564
565
566 struct mutex mq_freeze_lock;
567 struct percpu_ref q_usage_counter;
568
569 struct blk_mq_tag_set *tag_set;
570 struct list_head tag_set_list;
571 struct bio_set bio_split;
572
573#ifdef CONFIG_BLK_DEBUG_FS
574 struct dentry *debugfs_dir;
575 struct dentry *sched_debugfs_dir;
576 struct dentry *rqos_debugfs_dir;
577#endif
578
579 bool mq_sysfs_init_done;
580
581 size_t cmd_size;
582
583 struct work_struct release_work;
584
585#define BLK_MAX_WRITE_HINTS 5
586 u64 write_hints[BLK_MAX_WRITE_HINTS];
587};
588
589#define QUEUE_FLAG_STOPPED 0
590#define QUEUE_FLAG_DYING 1
591#define QUEUE_FLAG_NOMERGES 3
592#define QUEUE_FLAG_SAME_COMP 4
593#define QUEUE_FLAG_FAIL_IO 5
594#define QUEUE_FLAG_NONROT 6
595#define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT
596#define QUEUE_FLAG_IO_STAT 7
597#define QUEUE_FLAG_DISCARD 8
598#define QUEUE_FLAG_NOXMERGES 9
599#define QUEUE_FLAG_ADD_RANDOM 10
600#define QUEUE_FLAG_SECERASE 11
601#define QUEUE_FLAG_SAME_FORCE 12
602#define QUEUE_FLAG_DEAD 13
603#define QUEUE_FLAG_INIT_DONE 14
604#define QUEUE_FLAG_POLL 16
605#define QUEUE_FLAG_WC 17
606#define QUEUE_FLAG_FUA 18
607#define QUEUE_FLAG_DAX 19
608#define QUEUE_FLAG_STATS 20
609#define QUEUE_FLAG_POLL_STATS 21
610#define QUEUE_FLAG_REGISTERED 22
611#define QUEUE_FLAG_SCSI_PASSTHROUGH 23
612#define QUEUE_FLAG_QUIESCED 24
613#define QUEUE_FLAG_PCI_P2PDMA 25
614
615#define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
616 (1 << QUEUE_FLAG_SAME_COMP))
617
618void blk_queue_flag_set(unsigned int flag, struct request_queue *q);
619void blk_queue_flag_clear(unsigned int flag, struct request_queue *q);
620bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
621
622#define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
623#define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
624#define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
625#define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
626#define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
627#define blk_queue_noxmerges(q) \
628 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
629#define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
630#define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
631#define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
632#define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
633#define blk_queue_secure_erase(q) \
634 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
635#define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
636#define blk_queue_scsi_passthrough(q) \
637 test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags)
638#define blk_queue_pci_p2pdma(q) \
639 test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags)
640
641#define blk_noretry_request(rq) \
642 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
643 REQ_FAILFAST_DRIVER))
644#define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
645#define blk_queue_pm_only(q) atomic_read(&(q)->pm_only)
646#define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags)
647
648extern void blk_set_pm_only(struct request_queue *q);
649extern void blk_clear_pm_only(struct request_queue *q);
650
651static inline bool blk_account_rq(struct request *rq)
652{
653 return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq);
654}
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
667static inline bool queue_is_mq(struct request_queue *q)
668{
669 return q->mq_ops;
670}
671
672static inline enum blk_zoned_model
673blk_queue_zoned_model(struct request_queue *q)
674{
675 return q->limits.zoned;
676}
677
678static inline bool blk_queue_is_zoned(struct request_queue *q)
679{
680 switch (blk_queue_zoned_model(q)) {
681 case BLK_ZONED_HA:
682 case BLK_ZONED_HM:
683 return true;
684 default:
685 return false;
686 }
687}
688
689static inline sector_t blk_queue_zone_sectors(struct request_queue *q)
690{
691 return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0;
692}
693
694#ifdef CONFIG_BLK_DEV_ZONED
695static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
696{
697 return blk_queue_is_zoned(q) ? q->nr_zones : 0;
698}
699
700static inline unsigned int blk_queue_zone_no(struct request_queue *q,
701 sector_t sector)
702{
703 if (!blk_queue_is_zoned(q))
704 return 0;
705 return sector >> ilog2(q->limits.chunk_sectors);
706}
707
708static inline bool blk_queue_zone_is_seq(struct request_queue *q,
709 sector_t sector)
710{
711 if (!blk_queue_is_zoned(q) || !q->seq_zones_bitmap)
712 return false;
713 return test_bit(blk_queue_zone_no(q, sector), q->seq_zones_bitmap);
714}
715#else
716static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
717{
718 return 0;
719}
720#endif
721
722static inline bool rq_is_sync(struct request *rq)
723{
724 return op_is_sync(rq->cmd_flags);
725}
726
727static inline bool rq_mergeable(struct request *rq)
728{
729 if (blk_rq_is_passthrough(rq))
730 return false;
731
732 if (req_op(rq) == REQ_OP_FLUSH)
733 return false;
734
735 if (req_op(rq) == REQ_OP_WRITE_ZEROES)
736 return false;
737
738 if (rq->cmd_flags & REQ_NOMERGE_FLAGS)
739 return false;
740 if (rq->rq_flags & RQF_NOMERGE_FLAGS)
741 return false;
742
743 return true;
744}
745
746static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b)
747{
748 if (bio_page(a) == bio_page(b) &&
749 bio_offset(a) == bio_offset(b))
750 return true;
751
752 return false;
753}
754
755static inline unsigned int blk_queue_depth(struct request_queue *q)
756{
757 if (q->queue_depth)
758 return q->queue_depth;
759
760 return q->nr_requests;
761}
762
763extern unsigned long blk_max_low_pfn, blk_max_pfn;
764
765
766
767
768
769
770
771
772
773#if BITS_PER_LONG == 32
774#define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
775#else
776#define BLK_BOUNCE_HIGH -1ULL
777#endif
778#define BLK_BOUNCE_ANY (-1ULL)
779#define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
780
781
782
783
784#define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
785#define BLK_MIN_SG_TIMEOUT (7 * HZ)
786
787struct rq_map_data {
788 struct page **pages;
789 int page_order;
790 int nr_entries;
791 unsigned long offset;
792 int null_mapped;
793 int from_user;
794};
795
796struct req_iterator {
797 struct bvec_iter iter;
798 struct bio *bio;
799};
800
801
802#define for_each_bio(_bio) \
803 for (; _bio; _bio = _bio->bi_next)
804#define __rq_for_each_bio(_bio, rq) \
805 if ((rq->bio)) \
806 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
807
808#define rq_for_each_segment(bvl, _rq, _iter) \
809 __rq_for_each_bio(_iter.bio, _rq) \
810 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
811
812#define rq_for_each_bvec(bvl, _rq, _iter) \
813 __rq_for_each_bio(_iter.bio, _rq) \
814 bio_for_each_bvec(bvl, _iter.bio, _iter.iter)
815
816#define rq_iter_last(bvec, _iter) \
817 (_iter.bio->bi_next == NULL && \
818 bio_iter_last(bvec, _iter.iter))
819
820#ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
821# error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
822#endif
823#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
824extern void rq_flush_dcache_pages(struct request *rq);
825#else
826static inline void rq_flush_dcache_pages(struct request *rq)
827{
828}
829#endif
830
831extern int blk_register_queue(struct gendisk *disk);
832extern void blk_unregister_queue(struct gendisk *disk);
833extern blk_qc_t generic_make_request(struct bio *bio);
834extern blk_qc_t direct_make_request(struct bio *bio);
835extern void blk_rq_init(struct request_queue *q, struct request *rq);
836extern void blk_put_request(struct request *);
837extern struct request *blk_get_request(struct request_queue *, unsigned int op,
838 blk_mq_req_flags_t flags);
839extern int blk_lld_busy(struct request_queue *q);
840extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
841 struct bio_set *bs, gfp_t gfp_mask,
842 int (*bio_ctr)(struct bio *, struct bio *, void *),
843 void *data);
844extern void blk_rq_unprep_clone(struct request *rq);
845extern blk_status_t blk_insert_cloned_request(struct request_queue *q,
846 struct request *rq);
847extern int blk_rq_append_bio(struct request *rq, struct bio **bio);
848extern void blk_queue_split(struct request_queue *, struct bio **);
849extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int);
850extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t,
851 unsigned int, void __user *);
852extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
853 unsigned int, void __user *);
854extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
855 struct scsi_ioctl_command __user *);
856
857extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags);
858extern void blk_queue_exit(struct request_queue *q);
859extern void blk_sync_queue(struct request_queue *q);
860extern int blk_rq_map_user(struct request_queue *, struct request *,
861 struct rq_map_data *, void __user *, unsigned long,
862 gfp_t);
863extern int blk_rq_unmap_user(struct bio *);
864extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t);
865extern int blk_rq_map_user_iov(struct request_queue *, struct request *,
866 struct rq_map_data *, const struct iov_iter *,
867 gfp_t);
868extern void blk_execute_rq(struct request_queue *, struct gendisk *,
869 struct request *, int);
870extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
871 struct request *, int, rq_end_io_fn *);
872
873
874extern const char *blk_op_str(unsigned int op);
875
876int blk_status_to_errno(blk_status_t status);
877blk_status_t errno_to_blk_status(int errno);
878
879int blk_poll(struct request_queue *q, blk_qc_t cookie, bool spin);
880
881static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
882{
883 return bdev->bd_disk->queue;
884}
885
886
887
888
889
890
891
892#ifndef SECTOR_SHIFT
893#define SECTOR_SHIFT 9
894#endif
895#ifndef SECTOR_SIZE
896#define SECTOR_SIZE (1 << SECTOR_SHIFT)
897#endif
898
899
900
901
902
903
904
905
906
907static inline sector_t blk_rq_pos(const struct request *rq)
908{
909 return rq->__sector;
910}
911
912static inline unsigned int blk_rq_bytes(const struct request *rq)
913{
914 return rq->__data_len;
915}
916
917static inline int blk_rq_cur_bytes(const struct request *rq)
918{
919 return rq->bio ? bio_cur_bytes(rq->bio) : 0;
920}
921
922extern unsigned int blk_rq_err_bytes(const struct request *rq);
923
924static inline unsigned int blk_rq_sectors(const struct request *rq)
925{
926 return blk_rq_bytes(rq) >> SECTOR_SHIFT;
927}
928
929static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
930{
931 return blk_rq_cur_bytes(rq) >> SECTOR_SHIFT;
932}
933
934#ifdef CONFIG_BLK_DEV_ZONED
935static inline unsigned int blk_rq_zone_no(struct request *rq)
936{
937 return blk_queue_zone_no(rq->q, blk_rq_pos(rq));
938}
939
940static inline unsigned int blk_rq_zone_is_seq(struct request *rq)
941{
942 return blk_queue_zone_is_seq(rq->q, blk_rq_pos(rq));
943}
944#endif
945
946
947
948
949
950
951
952static inline unsigned int blk_rq_payload_bytes(struct request *rq)
953{
954 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
955 return rq->special_vec.bv_len;
956 return blk_rq_bytes(rq);
957}
958
959
960
961
962
963static inline struct bio_vec req_bvec(struct request *rq)
964{
965 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
966 return rq->special_vec;
967 return mp_bvec_iter_bvec(rq->bio->bi_io_vec, rq->bio->bi_iter);
968}
969
970static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
971 int op)
972{
973 if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE))
974 return min(q->limits.max_discard_sectors,
975 UINT_MAX >> SECTOR_SHIFT);
976
977 if (unlikely(op == REQ_OP_WRITE_SAME))
978 return q->limits.max_write_same_sectors;
979
980 if (unlikely(op == REQ_OP_WRITE_ZEROES))
981 return q->limits.max_write_zeroes_sectors;
982
983 return q->limits.max_sectors;
984}
985
986
987
988
989
990static inline unsigned int blk_max_size_offset(struct request_queue *q,
991 sector_t offset)
992{
993 if (!q->limits.chunk_sectors)
994 return q->limits.max_sectors;
995
996 return min(q->limits.max_sectors, (unsigned int)(q->limits.chunk_sectors -
997 (offset & (q->limits.chunk_sectors - 1))));
998}
999
1000static inline unsigned int blk_rq_get_max_sectors(struct request *rq,
1001 sector_t offset)
1002{
1003 struct request_queue *q = rq->q;
1004
1005 if (blk_rq_is_passthrough(rq))
1006 return q->limits.max_hw_sectors;
1007
1008 if (!q->limits.chunk_sectors ||
1009 req_op(rq) == REQ_OP_DISCARD ||
1010 req_op(rq) == REQ_OP_SECURE_ERASE)
1011 return blk_queue_get_max_sectors(q, req_op(rq));
1012
1013 return min(blk_max_size_offset(q, offset),
1014 blk_queue_get_max_sectors(q, req_op(rq)));
1015}
1016
1017static inline unsigned int blk_rq_count_bios(struct request *rq)
1018{
1019 unsigned int nr_bios = 0;
1020 struct bio *bio;
1021
1022 __rq_for_each_bio(bio, rq)
1023 nr_bios++;
1024
1025 return nr_bios;
1026}
1027
1028void blk_steal_bios(struct bio_list *list, struct request *rq);
1029
1030
1031
1032
1033
1034
1035
1036extern bool blk_update_request(struct request *rq, blk_status_t error,
1037 unsigned int nr_bytes);
1038
1039extern void __blk_complete_request(struct request *);
1040extern void blk_abort_request(struct request *);
1041
1042
1043
1044
1045extern void blk_cleanup_queue(struct request_queue *);
1046extern void blk_queue_make_request(struct request_queue *, make_request_fn *);
1047extern void blk_queue_bounce_limit(struct request_queue *, u64);
1048extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
1049extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
1050extern void blk_queue_max_segments(struct request_queue *, unsigned short);
1051extern void blk_queue_max_discard_segments(struct request_queue *,
1052 unsigned short);
1053extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
1054extern void blk_queue_max_discard_sectors(struct request_queue *q,
1055 unsigned int max_discard_sectors);
1056extern void blk_queue_max_write_same_sectors(struct request_queue *q,
1057 unsigned int max_write_same_sectors);
1058extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
1059 unsigned int max_write_same_sectors);
1060extern void blk_queue_logical_block_size(struct request_queue *, unsigned short);
1061extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
1062extern void blk_queue_alignment_offset(struct request_queue *q,
1063 unsigned int alignment);
1064extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
1065extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
1066extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
1067extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
1068extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
1069extern void blk_set_default_limits(struct queue_limits *lim);
1070extern void blk_set_stacking_limits(struct queue_limits *lim);
1071extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
1072 sector_t offset);
1073extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev,
1074 sector_t offset);
1075extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
1076 sector_t offset);
1077extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b);
1078extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
1079extern int blk_queue_dma_drain(struct request_queue *q,
1080 dma_drain_needed_fn *dma_drain_needed,
1081 void *buf, unsigned int size);
1082extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
1083extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
1084extern void blk_queue_dma_alignment(struct request_queue *, int);
1085extern void blk_queue_update_dma_alignment(struct request_queue *, int);
1086extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
1087extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098static inline unsigned short blk_rq_nr_phys_segments(struct request *rq)
1099{
1100 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1101 return 1;
1102 return rq->nr_phys_segments;
1103}
1104
1105
1106
1107
1108
1109static inline unsigned short blk_rq_nr_discard_segments(struct request *rq)
1110{
1111 return max_t(unsigned short, rq->nr_phys_segments, 1);
1112}
1113
1114extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *);
1115extern void blk_dump_rq_flags(struct request *, char *);
1116extern long nr_blockdev_pages(void);
1117
1118bool __must_check blk_get_queue(struct request_queue *);
1119struct request_queue *blk_alloc_queue(gfp_t);
1120struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id);
1121extern void blk_put_queue(struct request_queue *);
1122extern void blk_set_queue_dying(struct request_queue *);
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136struct blk_plug {
1137 struct list_head mq_list;
1138 struct list_head cb_list;
1139 unsigned short rq_count;
1140 bool multiple_queues;
1141};
1142#define BLK_MAX_REQUEST_COUNT 16
1143#define BLK_PLUG_FLUSH_SIZE (128 * 1024)
1144
1145struct blk_plug_cb;
1146typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
1147struct blk_plug_cb {
1148 struct list_head list;
1149 blk_plug_cb_fn callback;
1150 void *data;
1151};
1152extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
1153 void *data, int size);
1154extern void blk_start_plug(struct blk_plug *);
1155extern void blk_finish_plug(struct blk_plug *);
1156extern void blk_flush_plug_list(struct blk_plug *, bool);
1157
1158static inline void blk_flush_plug(struct task_struct *tsk)
1159{
1160 struct blk_plug *plug = tsk->plug;
1161
1162 if (plug)
1163 blk_flush_plug_list(plug, false);
1164}
1165
1166static inline void blk_schedule_flush_plug(struct task_struct *tsk)
1167{
1168 struct blk_plug *plug = tsk->plug;
1169
1170 if (plug)
1171 blk_flush_plug_list(plug, true);
1172}
1173
1174static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1175{
1176 struct blk_plug *plug = tsk->plug;
1177
1178 return plug &&
1179 (!list_empty(&plug->mq_list) ||
1180 !list_empty(&plug->cb_list));
1181}
1182
1183extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *);
1184extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
1185 sector_t nr_sects, gfp_t gfp_mask, struct page *page);
1186
1187#define BLKDEV_DISCARD_SECURE (1 << 0)
1188
1189extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1190 sector_t nr_sects, gfp_t gfp_mask, unsigned long flags);
1191extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1192 sector_t nr_sects, gfp_t gfp_mask, int flags,
1193 struct bio **biop);
1194
1195#define BLKDEV_ZERO_NOUNMAP (1 << 0)
1196#define BLKDEV_ZERO_NOFALLBACK (1 << 1)
1197
1198extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1199 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
1200 unsigned flags);
1201extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1202 sector_t nr_sects, gfp_t gfp_mask, unsigned flags);
1203
1204static inline int sb_issue_discard(struct super_block *sb, sector_t block,
1205 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
1206{
1207 return blkdev_issue_discard(sb->s_bdev,
1208 block << (sb->s_blocksize_bits -
1209 SECTOR_SHIFT),
1210 nr_blocks << (sb->s_blocksize_bits -
1211 SECTOR_SHIFT),
1212 gfp_mask, flags);
1213}
1214static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
1215 sector_t nr_blocks, gfp_t gfp_mask)
1216{
1217 return blkdev_issue_zeroout(sb->s_bdev,
1218 block << (sb->s_blocksize_bits -
1219 SECTOR_SHIFT),
1220 nr_blocks << (sb->s_blocksize_bits -
1221 SECTOR_SHIFT),
1222 gfp_mask, 0);
1223}
1224
1225extern int blk_verify_command(unsigned char *cmd, fmode_t mode);
1226
1227enum blk_default_limits {
1228 BLK_MAX_SEGMENTS = 128,
1229 BLK_SAFE_MAX_SECTORS = 255,
1230 BLK_DEF_MAX_SECTORS = 2560,
1231 BLK_MAX_SEGMENT_SIZE = 65536,
1232 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
1233};
1234
1235static inline unsigned long queue_segment_boundary(struct request_queue *q)
1236{
1237 return q->limits.seg_boundary_mask;
1238}
1239
1240static inline unsigned long queue_virt_boundary(struct request_queue *q)
1241{
1242 return q->limits.virt_boundary_mask;
1243}
1244
1245static inline unsigned int queue_max_sectors(struct request_queue *q)
1246{
1247 return q->limits.max_sectors;
1248}
1249
1250static inline unsigned int queue_max_hw_sectors(struct request_queue *q)
1251{
1252 return q->limits.max_hw_sectors;
1253}
1254
1255static inline unsigned short queue_max_segments(struct request_queue *q)
1256{
1257 return q->limits.max_segments;
1258}
1259
1260static inline unsigned short queue_max_discard_segments(struct request_queue *q)
1261{
1262 return q->limits.max_discard_segments;
1263}
1264
1265static inline unsigned int queue_max_segment_size(struct request_queue *q)
1266{
1267 return q->limits.max_segment_size;
1268}
1269
1270static inline unsigned short queue_logical_block_size(struct request_queue *q)
1271{
1272 int retval = 512;
1273
1274 if (q && q->limits.logical_block_size)
1275 retval = q->limits.logical_block_size;
1276
1277 return retval;
1278}
1279
1280static inline unsigned short bdev_logical_block_size(struct block_device *bdev)
1281{
1282 return queue_logical_block_size(bdev_get_queue(bdev));
1283}
1284
1285static inline unsigned int queue_physical_block_size(struct request_queue *q)
1286{
1287 return q->limits.physical_block_size;
1288}
1289
1290static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
1291{
1292 return queue_physical_block_size(bdev_get_queue(bdev));
1293}
1294
1295static inline unsigned int queue_io_min(struct request_queue *q)
1296{
1297 return q->limits.io_min;
1298}
1299
1300static inline int bdev_io_min(struct block_device *bdev)
1301{
1302 return queue_io_min(bdev_get_queue(bdev));
1303}
1304
1305static inline unsigned int queue_io_opt(struct request_queue *q)
1306{
1307 return q->limits.io_opt;
1308}
1309
1310static inline int bdev_io_opt(struct block_device *bdev)
1311{
1312 return queue_io_opt(bdev_get_queue(bdev));
1313}
1314
1315static inline int queue_alignment_offset(struct request_queue *q)
1316{
1317 if (q->limits.misaligned)
1318 return -1;
1319
1320 return q->limits.alignment_offset;
1321}
1322
1323static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector)
1324{
1325 unsigned int granularity = max(lim->physical_block_size, lim->io_min);
1326 unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT)
1327 << SECTOR_SHIFT;
1328
1329 return (granularity + lim->alignment_offset - alignment) % granularity;
1330}
1331
1332static inline int bdev_alignment_offset(struct block_device *bdev)
1333{
1334 struct request_queue *q = bdev_get_queue(bdev);
1335
1336 if (q->limits.misaligned)
1337 return -1;
1338
1339 if (bdev != bdev->bd_contains)
1340 return bdev->bd_part->alignment_offset;
1341
1342 return q->limits.alignment_offset;
1343}
1344
1345static inline int queue_discard_alignment(struct request_queue *q)
1346{
1347 if (q->limits.discard_misaligned)
1348 return -1;
1349
1350 return q->limits.discard_alignment;
1351}
1352
1353static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector)
1354{
1355 unsigned int alignment, granularity, offset;
1356
1357 if (!lim->max_discard_sectors)
1358 return 0;
1359
1360
1361 alignment = lim->discard_alignment >> SECTOR_SHIFT;
1362 granularity = lim->discard_granularity >> SECTOR_SHIFT;
1363 if (!granularity)
1364 return 0;
1365
1366
1367 offset = sector_div(sector, granularity);
1368
1369
1370 offset = (granularity + alignment - offset) % granularity;
1371
1372
1373 return offset << SECTOR_SHIFT;
1374}
1375
1376static inline int bdev_discard_alignment(struct block_device *bdev)
1377{
1378 struct request_queue *q = bdev_get_queue(bdev);
1379
1380 if (bdev != bdev->bd_contains)
1381 return bdev->bd_part->discard_alignment;
1382
1383 return q->limits.discard_alignment;
1384}
1385
1386static inline unsigned int bdev_write_same(struct block_device *bdev)
1387{
1388 struct request_queue *q = bdev_get_queue(bdev);
1389
1390 if (q)
1391 return q->limits.max_write_same_sectors;
1392
1393 return 0;
1394}
1395
1396static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
1397{
1398 struct request_queue *q = bdev_get_queue(bdev);
1399
1400 if (q)
1401 return q->limits.max_write_zeroes_sectors;
1402
1403 return 0;
1404}
1405
1406static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev)
1407{
1408 struct request_queue *q = bdev_get_queue(bdev);
1409
1410 if (q)
1411 return blk_queue_zoned_model(q);
1412
1413 return BLK_ZONED_NONE;
1414}
1415
1416static inline bool bdev_is_zoned(struct block_device *bdev)
1417{
1418 struct request_queue *q = bdev_get_queue(bdev);
1419
1420 if (q)
1421 return blk_queue_is_zoned(q);
1422
1423 return false;
1424}
1425
1426static inline sector_t bdev_zone_sectors(struct block_device *bdev)
1427{
1428 struct request_queue *q = bdev_get_queue(bdev);
1429
1430 if (q)
1431 return blk_queue_zone_sectors(q);
1432 return 0;
1433}
1434
1435static inline int queue_dma_alignment(struct request_queue *q)
1436{
1437 return q ? q->dma_alignment : 511;
1438}
1439
1440static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
1441 unsigned int len)
1442{
1443 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
1444 return !(addr & alignment) && !(len & alignment);
1445}
1446
1447
1448static inline unsigned int blksize_bits(unsigned int size)
1449{
1450 unsigned int bits = 8;
1451 do {
1452 bits++;
1453 size >>= 1;
1454 } while (size > 256);
1455 return bits;
1456}
1457
1458static inline unsigned int block_size(struct block_device *bdev)
1459{
1460 return bdev->bd_block_size;
1461}
1462
1463typedef struct {struct page *v;} Sector;
1464
1465unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *);
1466
1467static inline void put_dev_sector(Sector p)
1468{
1469 put_page(p.v);
1470}
1471
1472int kblockd_schedule_work(struct work_struct *work);
1473int kblockd_schedule_work_on(int cpu, struct work_struct *work);
1474int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
1475
1476#define MODULE_ALIAS_BLOCKDEV(major,minor) \
1477 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1478#define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1479 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1480
1481#if defined(CONFIG_BLK_DEV_INTEGRITY)
1482
1483enum blk_integrity_flags {
1484 BLK_INTEGRITY_VERIFY = 1 << 0,
1485 BLK_INTEGRITY_GENERATE = 1 << 1,
1486 BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2,
1487 BLK_INTEGRITY_IP_CHECKSUM = 1 << 3,
1488};
1489
1490struct blk_integrity_iter {
1491 void *prot_buf;
1492 void *data_buf;
1493 sector_t seed;
1494 unsigned int data_size;
1495 unsigned short interval;
1496 const char *disk_name;
1497};
1498
1499typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *);
1500
1501struct blk_integrity_profile {
1502 integrity_processing_fn *generate_fn;
1503 integrity_processing_fn *verify_fn;
1504 const char *name;
1505};
1506
1507extern void blk_integrity_register(struct gendisk *, struct blk_integrity *);
1508extern void blk_integrity_unregister(struct gendisk *);
1509extern int blk_integrity_compare(struct gendisk *, struct gendisk *);
1510extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *,
1511 struct scatterlist *);
1512extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *);
1513extern bool blk_integrity_merge_rq(struct request_queue *, struct request *,
1514 struct request *);
1515extern bool blk_integrity_merge_bio(struct request_queue *, struct request *,
1516 struct bio *);
1517
1518static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1519{
1520 struct blk_integrity *bi = &disk->queue->integrity;
1521
1522 if (!bi->profile)
1523 return NULL;
1524
1525 return bi;
1526}
1527
1528static inline
1529struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
1530{
1531 return blk_get_integrity(bdev->bd_disk);
1532}
1533
1534static inline bool blk_integrity_rq(struct request *rq)
1535{
1536 return rq->cmd_flags & REQ_INTEGRITY;
1537}
1538
1539static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1540 unsigned int segs)
1541{
1542 q->limits.max_integrity_segments = segs;
1543}
1544
1545static inline unsigned short
1546queue_max_integrity_segments(struct request_queue *q)
1547{
1548 return q->limits.max_integrity_segments;
1549}
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
1562 unsigned int sectors)
1563{
1564 return sectors >> (bi->interval_exp - 9);
1565}
1566
1567static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
1568 unsigned int sectors)
1569{
1570 return bio_integrity_intervals(bi, sectors) * bi->tuple_size;
1571}
1572
1573
1574
1575
1576
1577static inline struct bio_vec *rq_integrity_vec(struct request *rq)
1578{
1579 if (WARN_ON_ONCE(queue_max_integrity_segments(rq->q) > 1))
1580 return NULL;
1581 return rq->bio->bi_integrity->bip_vec;
1582}
1583
1584#else
1585
1586struct bio;
1587struct block_device;
1588struct gendisk;
1589struct blk_integrity;
1590
1591static inline int blk_integrity_rq(struct request *rq)
1592{
1593 return 0;
1594}
1595static inline int blk_rq_count_integrity_sg(struct request_queue *q,
1596 struct bio *b)
1597{
1598 return 0;
1599}
1600static inline int blk_rq_map_integrity_sg(struct request_queue *q,
1601 struct bio *b,
1602 struct scatterlist *s)
1603{
1604 return 0;
1605}
1606static inline struct blk_integrity *bdev_get_integrity(struct block_device *b)
1607{
1608 return NULL;
1609}
1610static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1611{
1612 return NULL;
1613}
1614static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b)
1615{
1616 return 0;
1617}
1618static inline void blk_integrity_register(struct gendisk *d,
1619 struct blk_integrity *b)
1620{
1621}
1622static inline void blk_integrity_unregister(struct gendisk *d)
1623{
1624}
1625static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1626 unsigned int segs)
1627{
1628}
1629static inline unsigned short queue_max_integrity_segments(struct request_queue *q)
1630{
1631 return 0;
1632}
1633static inline bool blk_integrity_merge_rq(struct request_queue *rq,
1634 struct request *r1,
1635 struct request *r2)
1636{
1637 return true;
1638}
1639static inline bool blk_integrity_merge_bio(struct request_queue *rq,
1640 struct request *r,
1641 struct bio *b)
1642{
1643 return true;
1644}
1645
1646static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
1647 unsigned int sectors)
1648{
1649 return 0;
1650}
1651
1652static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
1653 unsigned int sectors)
1654{
1655 return 0;
1656}
1657
1658static inline struct bio_vec *rq_integrity_vec(struct request *rq)
1659{
1660 return NULL;
1661}
1662
1663#endif
1664
1665struct block_device_operations {
1666 int (*open) (struct block_device *, fmode_t);
1667 void (*release) (struct gendisk *, fmode_t);
1668 int (*rw_page)(struct block_device *, sector_t, struct page *, unsigned int);
1669 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1670 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1671 unsigned int (*check_events) (struct gendisk *disk,
1672 unsigned int clearing);
1673
1674 int (*media_changed) (struct gendisk *);
1675 void (*unlock_native_capacity) (struct gendisk *);
1676 int (*revalidate_disk) (struct gendisk *);
1677 int (*getgeo)(struct block_device *, struct hd_geometry *);
1678
1679 void (*swap_slot_free_notify) (struct block_device *, unsigned long);
1680 int (*report_zones)(struct gendisk *, sector_t sector,
1681 struct blk_zone *zones, unsigned int *nr_zones);
1682 struct module *owner;
1683 const struct pr_ops *pr_ops;
1684};
1685
1686extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int,
1687 unsigned long);
1688extern int bdev_read_page(struct block_device *, sector_t, struct page *);
1689extern int bdev_write_page(struct block_device *, sector_t, struct page *,
1690 struct writeback_control *);
1691
1692#ifdef CONFIG_BLK_DEV_ZONED
1693bool blk_req_needs_zone_write_lock(struct request *rq);
1694void __blk_req_zone_write_lock(struct request *rq);
1695void __blk_req_zone_write_unlock(struct request *rq);
1696
1697static inline void blk_req_zone_write_lock(struct request *rq)
1698{
1699 if (blk_req_needs_zone_write_lock(rq))
1700 __blk_req_zone_write_lock(rq);
1701}
1702
1703static inline void blk_req_zone_write_unlock(struct request *rq)
1704{
1705 if (rq->rq_flags & RQF_ZONE_WRITE_LOCKED)
1706 __blk_req_zone_write_unlock(rq);
1707}
1708
1709static inline bool blk_req_zone_is_write_locked(struct request *rq)
1710{
1711 return rq->q->seq_zones_wlock &&
1712 test_bit(blk_rq_zone_no(rq), rq->q->seq_zones_wlock);
1713}
1714
1715static inline bool blk_req_can_dispatch_to_zone(struct request *rq)
1716{
1717 if (!blk_req_needs_zone_write_lock(rq))
1718 return true;
1719 return !blk_req_zone_is_write_locked(rq);
1720}
1721#else
1722static inline bool blk_req_needs_zone_write_lock(struct request *rq)
1723{
1724 return false;
1725}
1726
1727static inline void blk_req_zone_write_lock(struct request *rq)
1728{
1729}
1730
1731static inline void blk_req_zone_write_unlock(struct request *rq)
1732{
1733}
1734static inline bool blk_req_zone_is_write_locked(struct request *rq)
1735{
1736 return false;
1737}
1738
1739static inline bool blk_req_can_dispatch_to_zone(struct request *rq)
1740{
1741 return true;
1742}
1743#endif
1744
1745#else
1746
1747struct block_device;
1748
1749
1750
1751
1752#define buffer_heads_over_limit 0
1753
1754static inline long nr_blockdev_pages(void)
1755{
1756 return 0;
1757}
1758
1759struct blk_plug {
1760};
1761
1762static inline void blk_start_plug(struct blk_plug *plug)
1763{
1764}
1765
1766static inline void blk_finish_plug(struct blk_plug *plug)
1767{
1768}
1769
1770static inline void blk_flush_plug(struct task_struct *task)
1771{
1772}
1773
1774static inline void blk_schedule_flush_plug(struct task_struct *task)
1775{
1776}
1777
1778
1779static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1780{
1781 return false;
1782}
1783
1784static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask,
1785 sector_t *error_sector)
1786{
1787 return 0;
1788}
1789
1790#endif
1791
1792static inline void blk_wake_io_task(struct task_struct *waiter)
1793{
1794
1795
1796
1797
1798
1799 if (waiter == current)
1800 __set_current_state(TASK_RUNNING);
1801 else
1802 wake_up_process(waiter);
1803}
1804
1805#endif
1806