1#ifndef _LINUX_BLKDEV_H
2#define _LINUX_BLKDEV_H
3
4#include <linux/sched.h>
5
6#ifdef CONFIG_BLOCK
7
8#include <linux/major.h>
9#include <linux/genhd.h>
10#include <linux/list.h>
11#include <linux/llist.h>
12#include <linux/timer.h>
13#include <linux/workqueue.h>
14#include <linux/pagemap.h>
15#include <linux/backing-dev-defs.h>
16#include <linux/wait.h>
17#include <linux/mempool.h>
18#include <linux/pfn.h>
19#include <linux/bio.h>
20#include <linux/stringify.h>
21#include <linux/gfp.h>
22#include <linux/bsg.h>
23#include <linux/smp.h>
24#include <linux/rcupdate.h>
25#include <linux/percpu-refcount.h>
26#include <linux/scatterlist.h>
27
28struct module;
29struct scsi_ioctl_command;
30
31struct request_queue;
32struct elevator_queue;
33struct blk_trace;
34struct request;
35struct sg_io_hdr;
36struct bsg_job;
37struct blkcg_gq;
38struct blk_flush_queue;
39struct pr_ops;
40
41#define BLKDEV_MIN_RQ 4
42#define BLKDEV_MAX_RQ 128
43
44
45
46
47
48#define BLKCG_MAX_POLS 2
49
50typedef void (rq_end_io_fn)(struct request *, int);
51
52#define BLK_RL_SYNCFULL (1U << 0)
53#define BLK_RL_ASYNCFULL (1U << 1)
54
55struct request_list {
56 struct request_queue *q;
57#ifdef CONFIG_BLK_CGROUP
58 struct blkcg_gq *blkg;
59#endif
60
61
62
63
64 int count[2];
65 int starved[2];
66 mempool_t *rq_pool;
67 wait_queue_head_t wait[2];
68 unsigned int flags;
69};
70
71
72
73
74enum rq_cmd_type_bits {
75 REQ_TYPE_FS = 1,
76 REQ_TYPE_BLOCK_PC,
77 REQ_TYPE_DRV_PRIV,
78};
79
80#define BLK_MAX_CDB 16
81
82
83
84
85
86
87
88struct request {
89 struct list_head queuelist;
90 union {
91 struct call_single_data csd;
92 u64 fifo_time;
93 };
94
95 struct request_queue *q;
96 struct blk_mq_ctx *mq_ctx;
97
98 int cpu;
99 unsigned cmd_type;
100 u64 cmd_flags;
101 unsigned long atomic_flags;
102
103
104 unsigned int __data_len;
105 sector_t __sector;
106
107 struct bio *bio;
108 struct bio *biotail;
109
110
111
112
113
114
115
116
117 union {
118 struct hlist_node hash;
119 struct list_head ipi_list;
120 };
121
122
123
124
125
126
127 union {
128 struct rb_node rb_node;
129 void *completion_data;
130 };
131
132
133
134
135
136
137
138 union {
139 struct {
140 struct io_cq *icq;
141 void *priv[2];
142 } elv;
143
144 struct {
145 unsigned int seq;
146 struct list_head list;
147 rq_end_io_fn *saved_end_io;
148 } flush;
149 };
150
151 struct gendisk *rq_disk;
152 struct hd_struct *part;
153 unsigned long start_time;
154#ifdef CONFIG_BLK_CGROUP
155 struct request_list *rl;
156 unsigned long long start_time_ns;
157 unsigned long long io_start_time_ns;
158#endif
159
160
161
162 unsigned short nr_phys_segments;
163#if defined(CONFIG_BLK_DEV_INTEGRITY)
164 unsigned short nr_integrity_segments;
165#endif
166
167 unsigned short ioprio;
168
169 void *special;
170
171 int tag;
172 int errors;
173
174
175
176
177 unsigned char __cmd[BLK_MAX_CDB];
178 unsigned char *cmd;
179 unsigned short cmd_len;
180
181 unsigned int extra_len;
182 unsigned int sense_len;
183 unsigned int resid_len;
184 void *sense;
185
186 unsigned long deadline;
187 struct list_head timeout_list;
188 unsigned int timeout;
189 int retries;
190
191
192
193
194 rq_end_io_fn *end_io;
195 void *end_io_data;
196
197
198 struct request *next_rq;
199};
200
201#define REQ_OP_SHIFT (8 * sizeof(u64) - REQ_OP_BITS)
202#define req_op(req) ((req)->cmd_flags >> REQ_OP_SHIFT)
203
204#define req_set_op(req, op) do { \
205 WARN_ON(op >= (1 << REQ_OP_BITS)); \
206 (req)->cmd_flags &= ((1ULL << REQ_OP_SHIFT) - 1); \
207 (req)->cmd_flags |= ((u64) (op) << REQ_OP_SHIFT); \
208} while (0)
209
210#define req_set_op_attrs(req, op, flags) do { \
211 req_set_op(req, op); \
212 (req)->cmd_flags |= flags; \
213} while (0)
214
215static inline unsigned short req_get_ioprio(struct request *req)
216{
217 return req->ioprio;
218}
219
220#include <linux/elevator.h>
221
222struct blk_queue_ctx;
223
224typedef void (request_fn_proc) (struct request_queue *q);
225typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio);
226typedef int (prep_rq_fn) (struct request_queue *, struct request *);
227typedef void (unprep_rq_fn) (struct request_queue *, struct request *);
228
229struct bio_vec;
230typedef void (softirq_done_fn)(struct request *);
231typedef int (dma_drain_needed_fn)(struct request *);
232typedef int (lld_busy_fn) (struct request_queue *q);
233typedef int (bsg_job_fn) (struct bsg_job *);
234
235enum blk_eh_timer_return {
236 BLK_EH_NOT_HANDLED,
237 BLK_EH_HANDLED,
238 BLK_EH_RESET_TIMER,
239};
240
241typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *);
242
243enum blk_queue_state {
244 Queue_down,
245 Queue_up,
246};
247
248struct blk_queue_tag {
249 struct request **tag_index;
250 unsigned long *tag_map;
251 int busy;
252 int max_depth;
253 int real_max_depth;
254 atomic_t refcnt;
255 int alloc_policy;
256 int next_tag;
257};
258#define BLK_TAG_ALLOC_FIFO 0
259#define BLK_TAG_ALLOC_RR 1
260
261#define BLK_SCSI_MAX_CMDS (256)
262#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
263
264struct queue_limits {
265 unsigned long bounce_pfn;
266 unsigned long seg_boundary_mask;
267 unsigned long virt_boundary_mask;
268
269 unsigned int max_hw_sectors;
270 unsigned int max_dev_sectors;
271 unsigned int chunk_sectors;
272 unsigned int max_sectors;
273 unsigned int max_segment_size;
274 unsigned int physical_block_size;
275 unsigned int alignment_offset;
276 unsigned int io_min;
277 unsigned int io_opt;
278 unsigned int max_discard_sectors;
279 unsigned int max_hw_discard_sectors;
280 unsigned int max_write_same_sectors;
281 unsigned int discard_granularity;
282 unsigned int discard_alignment;
283
284 unsigned short logical_block_size;
285 unsigned short max_segments;
286 unsigned short max_integrity_segments;
287
288 unsigned char misaligned;
289 unsigned char discard_misaligned;
290 unsigned char cluster;
291 unsigned char discard_zeroes_data;
292 unsigned char raid_partial_stripes_expensive;
293};
294
295struct request_queue {
296
297
298
299 struct list_head queue_head;
300 struct request *last_merge;
301 struct elevator_queue *elevator;
302 int nr_rqs[2];
303 int nr_rqs_elvpriv;
304
305
306
307
308
309
310
311 struct request_list root_rl;
312
313 request_fn_proc *request_fn;
314 make_request_fn *make_request_fn;
315 prep_rq_fn *prep_rq_fn;
316 unprep_rq_fn *unprep_rq_fn;
317 softirq_done_fn *softirq_done_fn;
318 rq_timed_out_fn *rq_timed_out_fn;
319 dma_drain_needed_fn *dma_drain_needed;
320 lld_busy_fn *lld_busy_fn;
321
322 struct blk_mq_ops *mq_ops;
323
324 unsigned int *mq_map;
325
326
327 struct blk_mq_ctx __percpu *queue_ctx;
328 unsigned int nr_queues;
329
330
331 struct blk_mq_hw_ctx **queue_hw_ctx;
332 unsigned int nr_hw_queues;
333
334
335
336
337 sector_t end_sector;
338 struct request *boundary_rq;
339
340
341
342
343 struct delayed_work delay_work;
344
345 struct backing_dev_info backing_dev_info;
346
347
348
349
350
351 void *queuedata;
352
353
354
355
356 unsigned long queue_flags;
357
358
359
360
361
362 int id;
363
364
365
366
367 gfp_t bounce_gfp;
368
369
370
371
372
373
374 spinlock_t __queue_lock;
375 spinlock_t *queue_lock;
376
377
378
379
380 struct kobject kobj;
381
382
383
384
385 struct kobject mq_kobj;
386
387#ifdef CONFIG_BLK_DEV_INTEGRITY
388 struct blk_integrity integrity;
389#endif
390
391#ifdef CONFIG_PM
392 struct device *dev;
393 int rpm_status;
394 unsigned int nr_pending;
395#endif
396
397
398
399
400 unsigned long nr_requests;
401 unsigned int nr_congestion_on;
402 unsigned int nr_congestion_off;
403 unsigned int nr_batching;
404
405 unsigned int dma_drain_size;
406 void *dma_drain_buffer;
407 unsigned int dma_pad_mask;
408 unsigned int dma_alignment;
409
410 struct blk_queue_tag *queue_tags;
411 struct list_head tag_busy_list;
412
413 unsigned int nr_sorted;
414 unsigned int in_flight[2];
415
416
417
418
419
420 unsigned int request_fn_active;
421
422 unsigned int rq_timeout;
423 struct timer_list timeout;
424 struct work_struct timeout_work;
425 struct list_head timeout_list;
426
427 struct list_head icq_list;
428#ifdef CONFIG_BLK_CGROUP
429 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
430 struct blkcg_gq *root_blkg;
431 struct list_head blkg_list;
432#endif
433
434 struct queue_limits limits;
435
436
437
438
439 unsigned int sg_timeout;
440 unsigned int sg_reserved_size;
441 int node;
442#ifdef CONFIG_BLK_DEV_IO_TRACE
443 struct blk_trace *blk_trace;
444#endif
445
446
447
448 struct blk_flush_queue *fq;
449
450 struct list_head requeue_list;
451 spinlock_t requeue_lock;
452 struct delayed_work requeue_work;
453
454 struct mutex sysfs_lock;
455
456 int bypass_depth;
457 atomic_t mq_freeze_depth;
458
459#if defined(CONFIG_BLK_DEV_BSG)
460 bsg_job_fn *bsg_job_fn;
461 int bsg_job_size;
462 struct bsg_class_device bsg_dev;
463#endif
464
465#ifdef CONFIG_BLK_DEV_THROTTLING
466
467 struct throtl_data *td;
468#endif
469 struct rcu_head rcu_head;
470 wait_queue_head_t mq_freeze_wq;
471 struct percpu_ref q_usage_counter;
472 struct list_head all_q_node;
473
474 struct blk_mq_tag_set *tag_set;
475 struct list_head tag_set_list;
476 struct bio_set *bio_split;
477
478 bool mq_sysfs_init_done;
479};
480
481#define QUEUE_FLAG_QUEUED 1
482#define QUEUE_FLAG_STOPPED 2
483#define QUEUE_FLAG_SYNCFULL 3
484#define QUEUE_FLAG_ASYNCFULL 4
485#define QUEUE_FLAG_DYING 5
486#define QUEUE_FLAG_BYPASS 6
487#define QUEUE_FLAG_BIDI 7
488#define QUEUE_FLAG_NOMERGES 8
489#define QUEUE_FLAG_SAME_COMP 9
490#define QUEUE_FLAG_FAIL_IO 10
491#define QUEUE_FLAG_STACKABLE 11
492#define QUEUE_FLAG_NONROT 12
493#define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT
494#define QUEUE_FLAG_IO_STAT 13
495#define QUEUE_FLAG_DISCARD 14
496#define QUEUE_FLAG_NOXMERGES 15
497#define QUEUE_FLAG_ADD_RANDOM 16
498#define QUEUE_FLAG_SECERASE 17
499#define QUEUE_FLAG_SAME_FORCE 18
500#define QUEUE_FLAG_DEAD 19
501#define QUEUE_FLAG_INIT_DONE 20
502#define QUEUE_FLAG_NO_SG_MERGE 21
503#define QUEUE_FLAG_POLL 22
504#define QUEUE_FLAG_WC 23
505#define QUEUE_FLAG_FUA 24
506#define QUEUE_FLAG_FLUSH_NQ 25
507#define QUEUE_FLAG_DAX 26
508
509#define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
510 (1 << QUEUE_FLAG_STACKABLE) | \
511 (1 << QUEUE_FLAG_SAME_COMP) | \
512 (1 << QUEUE_FLAG_ADD_RANDOM))
513
514#define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
515 (1 << QUEUE_FLAG_STACKABLE) | \
516 (1 << QUEUE_FLAG_SAME_COMP) | \
517 (1 << QUEUE_FLAG_POLL))
518
519static inline void queue_lockdep_assert_held(struct request_queue *q)
520{
521 if (q->queue_lock)
522 lockdep_assert_held(q->queue_lock);
523}
524
525static inline void queue_flag_set_unlocked(unsigned int flag,
526 struct request_queue *q)
527{
528 __set_bit(flag, &q->queue_flags);
529}
530
531static inline int queue_flag_test_and_clear(unsigned int flag,
532 struct request_queue *q)
533{
534 queue_lockdep_assert_held(q);
535
536 if (test_bit(flag, &q->queue_flags)) {
537 __clear_bit(flag, &q->queue_flags);
538 return 1;
539 }
540
541 return 0;
542}
543
544static inline int queue_flag_test_and_set(unsigned int flag,
545 struct request_queue *q)
546{
547 queue_lockdep_assert_held(q);
548
549 if (!test_bit(flag, &q->queue_flags)) {
550 __set_bit(flag, &q->queue_flags);
551 return 0;
552 }
553
554 return 1;
555}
556
557static inline void queue_flag_set(unsigned int flag, struct request_queue *q)
558{
559 queue_lockdep_assert_held(q);
560 __set_bit(flag, &q->queue_flags);
561}
562
563static inline void queue_flag_clear_unlocked(unsigned int flag,
564 struct request_queue *q)
565{
566 __clear_bit(flag, &q->queue_flags);
567}
568
569static inline int queue_in_flight(struct request_queue *q)
570{
571 return q->in_flight[0] + q->in_flight[1];
572}
573
574static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
575{
576 queue_lockdep_assert_held(q);
577 __clear_bit(flag, &q->queue_flags);
578}
579
580#define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
581#define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
582#define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
583#define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
584#define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags)
585#define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
586#define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
587#define blk_queue_noxmerges(q) \
588 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
589#define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
590#define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
591#define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
592#define blk_queue_stackable(q) \
593 test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
594#define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
595#define blk_queue_secure_erase(q) \
596 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
597#define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
598
599#define blk_noretry_request(rq) \
600 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
601 REQ_FAILFAST_DRIVER))
602
603#define blk_account_rq(rq) \
604 (((rq)->cmd_flags & REQ_STARTED) && \
605 ((rq)->cmd_type == REQ_TYPE_FS))
606
607#define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
608#define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
609
610#define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
611
612#define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
613
614#define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ)
615
616
617
618
619
620static inline bool queue_is_rq_based(struct request_queue *q)
621{
622 return q->request_fn || q->mq_ops;
623}
624
625static inline unsigned int blk_queue_cluster(struct request_queue *q)
626{
627 return q->limits.cluster;
628}
629
630
631
632
633static inline bool rw_is_sync(int op, unsigned int rw_flags)
634{
635 return op == REQ_OP_READ || (rw_flags & REQ_SYNC);
636}
637
638static inline bool rq_is_sync(struct request *rq)
639{
640 return rw_is_sync(req_op(rq), rq->cmd_flags);
641}
642
643static inline bool blk_rl_full(struct request_list *rl, bool sync)
644{
645 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
646
647 return rl->flags & flag;
648}
649
650static inline void blk_set_rl_full(struct request_list *rl, bool sync)
651{
652 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
653
654 rl->flags |= flag;
655}
656
657static inline void blk_clear_rl_full(struct request_list *rl, bool sync)
658{
659 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
660
661 rl->flags &= ~flag;
662}
663
664static inline bool rq_mergeable(struct request *rq)
665{
666 if (rq->cmd_type != REQ_TYPE_FS)
667 return false;
668
669 if (req_op(rq) == REQ_OP_FLUSH)
670 return false;
671
672 if (rq->cmd_flags & REQ_NOMERGE_FLAGS)
673 return false;
674
675 return true;
676}
677
678static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b)
679{
680 if (bio_data(a) == bio_data(b))
681 return true;
682
683 return false;
684}
685
686
687
688
689enum {
690 BLKPREP_OK,
691 BLKPREP_KILL,
692 BLKPREP_DEFER,
693 BLKPREP_INVALID,
694};
695
696extern unsigned long blk_max_low_pfn, blk_max_pfn;
697
698
699
700
701
702
703
704
705
706#if BITS_PER_LONG == 32
707#define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
708#else
709#define BLK_BOUNCE_HIGH -1ULL
710#endif
711#define BLK_BOUNCE_ANY (-1ULL)
712#define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
713
714
715
716
717#define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
718#define BLK_MIN_SG_TIMEOUT (7 * HZ)
719
720#ifdef CONFIG_BOUNCE
721extern int init_emergency_isa_pool(void);
722extern void blk_queue_bounce(struct request_queue *q, struct bio **bio);
723#else
724static inline int init_emergency_isa_pool(void)
725{
726 return 0;
727}
728static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio)
729{
730}
731#endif
732
733struct rq_map_data {
734 struct page **pages;
735 int page_order;
736 int nr_entries;
737 unsigned long offset;
738 int null_mapped;
739 int from_user;
740};
741
742struct req_iterator {
743 struct bvec_iter iter;
744 struct bio *bio;
745};
746
747
748#define for_each_bio(_bio) \
749 for (; _bio; _bio = _bio->bi_next)
750#define __rq_for_each_bio(_bio, rq) \
751 if ((rq->bio)) \
752 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
753
754#define rq_for_each_segment(bvl, _rq, _iter) \
755 __rq_for_each_bio(_iter.bio, _rq) \
756 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
757
758#define rq_iter_last(bvec, _iter) \
759 (_iter.bio->bi_next == NULL && \
760 bio_iter_last(bvec, _iter.iter))
761
762#ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
763# error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
764#endif
765#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
766extern void rq_flush_dcache_pages(struct request *rq);
767#else
768static inline void rq_flush_dcache_pages(struct request *rq)
769{
770}
771#endif
772
773#ifdef CONFIG_PRINTK
774#define vfs_msg(sb, level, fmt, ...) \
775 __vfs_msg(sb, level, fmt, ##__VA_ARGS__)
776#else
777#define vfs_msg(sb, level, fmt, ...) \
778do { \
779 no_printk(fmt, ##__VA_ARGS__); \
780 __vfs_msg(sb, "", " "); \
781} while (0)
782#endif
783
784extern int blk_register_queue(struct gendisk *disk);
785extern void blk_unregister_queue(struct gendisk *disk);
786extern blk_qc_t generic_make_request(struct bio *bio);
787extern void blk_rq_init(struct request_queue *q, struct request *rq);
788extern void blk_put_request(struct request *);
789extern void __blk_put_request(struct request_queue *, struct request *);
790extern struct request *blk_get_request(struct request_queue *, int, gfp_t);
791extern void blk_rq_set_block_pc(struct request *);
792extern void blk_requeue_request(struct request_queue *, struct request *);
793extern void blk_add_request_payload(struct request *rq, struct page *page,
794 int offset, unsigned int len);
795extern int blk_lld_busy(struct request_queue *q);
796extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
797 struct bio_set *bs, gfp_t gfp_mask,
798 int (*bio_ctr)(struct bio *, struct bio *, void *),
799 void *data);
800extern void blk_rq_unprep_clone(struct request *rq);
801extern int blk_insert_cloned_request(struct request_queue *q,
802 struct request *rq);
803extern int blk_rq_append_bio(struct request *rq, struct bio *bio);
804extern void blk_delay_queue(struct request_queue *, unsigned long);
805extern void blk_queue_split(struct request_queue *, struct bio **,
806 struct bio_set *);
807extern void blk_recount_segments(struct request_queue *, struct bio *);
808extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int);
809extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t,
810 unsigned int, void __user *);
811extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
812 unsigned int, void __user *);
813extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
814 struct scsi_ioctl_command __user *);
815
816extern int blk_queue_enter(struct request_queue *q, bool nowait);
817extern void blk_queue_exit(struct request_queue *q);
818extern void blk_start_queue(struct request_queue *q);
819extern void blk_start_queue_async(struct request_queue *q);
820extern void blk_stop_queue(struct request_queue *q);
821extern void blk_sync_queue(struct request_queue *q);
822extern void __blk_stop_queue(struct request_queue *q);
823extern void __blk_run_queue(struct request_queue *q);
824extern void __blk_run_queue_uncond(struct request_queue *q);
825extern void blk_run_queue(struct request_queue *);
826extern void blk_run_queue_async(struct request_queue *q);
827extern int blk_rq_map_user(struct request_queue *, struct request *,
828 struct rq_map_data *, void __user *, unsigned long,
829 gfp_t);
830extern int blk_rq_unmap_user(struct bio *);
831extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t);
832extern int blk_rq_map_user_iov(struct request_queue *, struct request *,
833 struct rq_map_data *, const struct iov_iter *,
834 gfp_t);
835extern int blk_execute_rq(struct request_queue *, struct gendisk *,
836 struct request *, int);
837extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
838 struct request *, int, rq_end_io_fn *);
839
840bool blk_poll(struct request_queue *q, blk_qc_t cookie);
841
842static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
843{
844 return bdev->bd_disk->queue;
845}
846
847
848
849
850
851
852
853
854
855static inline sector_t blk_rq_pos(const struct request *rq)
856{
857 return rq->__sector;
858}
859
860static inline unsigned int blk_rq_bytes(const struct request *rq)
861{
862 return rq->__data_len;
863}
864
865static inline int blk_rq_cur_bytes(const struct request *rq)
866{
867 return rq->bio ? bio_cur_bytes(rq->bio) : 0;
868}
869
870extern unsigned int blk_rq_err_bytes(const struct request *rq);
871
872static inline unsigned int blk_rq_sectors(const struct request *rq)
873{
874 return blk_rq_bytes(rq) >> 9;
875}
876
877static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
878{
879 return blk_rq_cur_bytes(rq) >> 9;
880}
881
882static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
883 int op)
884{
885 if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE))
886 return min(q->limits.max_discard_sectors, UINT_MAX >> 9);
887
888 if (unlikely(op == REQ_OP_WRITE_SAME))
889 return q->limits.max_write_same_sectors;
890
891 return q->limits.max_sectors;
892}
893
894
895
896
897
898static inline unsigned int blk_max_size_offset(struct request_queue *q,
899 sector_t offset)
900{
901 if (!q->limits.chunk_sectors)
902 return q->limits.max_sectors;
903
904 return q->limits.chunk_sectors -
905 (offset & (q->limits.chunk_sectors - 1));
906}
907
908static inline unsigned int blk_rq_get_max_sectors(struct request *rq,
909 sector_t offset)
910{
911 struct request_queue *q = rq->q;
912
913 if (unlikely(rq->cmd_type != REQ_TYPE_FS))
914 return q->limits.max_hw_sectors;
915
916 if (!q->limits.chunk_sectors ||
917 req_op(rq) == REQ_OP_DISCARD ||
918 req_op(rq) == REQ_OP_SECURE_ERASE)
919 return blk_queue_get_max_sectors(q, req_op(rq));
920
921 return min(blk_max_size_offset(q, offset),
922 blk_queue_get_max_sectors(q, req_op(rq)));
923}
924
925static inline unsigned int blk_rq_count_bios(struct request *rq)
926{
927 unsigned int nr_bios = 0;
928 struct bio *bio;
929
930 __rq_for_each_bio(bio, rq)
931 nr_bios++;
932
933 return nr_bios;
934}
935
936
937
938
939extern struct request *blk_peek_request(struct request_queue *q);
940extern void blk_start_request(struct request *rq);
941extern struct request *blk_fetch_request(struct request_queue *q);
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956extern bool blk_update_request(struct request *rq, int error,
957 unsigned int nr_bytes);
958extern void blk_finish_request(struct request *rq, int error);
959extern bool blk_end_request(struct request *rq, int error,
960 unsigned int nr_bytes);
961extern void blk_end_request_all(struct request *rq, int error);
962extern bool blk_end_request_cur(struct request *rq, int error);
963extern bool blk_end_request_err(struct request *rq, int error);
964extern bool __blk_end_request(struct request *rq, int error,
965 unsigned int nr_bytes);
966extern void __blk_end_request_all(struct request *rq, int error);
967extern bool __blk_end_request_cur(struct request *rq, int error);
968extern bool __blk_end_request_err(struct request *rq, int error);
969
970extern void blk_complete_request(struct request *);
971extern void __blk_complete_request(struct request *);
972extern void blk_abort_request(struct request *);
973extern void blk_unprep_request(struct request *);
974
975
976
977
978extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn,
979 spinlock_t *lock, int node_id);
980extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *);
981extern struct request_queue *blk_init_allocated_queue(struct request_queue *,
982 request_fn_proc *, spinlock_t *);
983extern void blk_cleanup_queue(struct request_queue *);
984extern void blk_queue_make_request(struct request_queue *, make_request_fn *);
985extern void blk_queue_bounce_limit(struct request_queue *, u64);
986extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
987extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
988extern void blk_queue_max_segments(struct request_queue *, unsigned short);
989extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
990extern void blk_queue_max_discard_sectors(struct request_queue *q,
991 unsigned int max_discard_sectors);
992extern void blk_queue_max_write_same_sectors(struct request_queue *q,
993 unsigned int max_write_same_sectors);
994extern void blk_queue_logical_block_size(struct request_queue *, unsigned short);
995extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
996extern void blk_queue_alignment_offset(struct request_queue *q,
997 unsigned int alignment);
998extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
999extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
1000extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
1001extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
1002extern void blk_set_default_limits(struct queue_limits *lim);
1003extern void blk_set_stacking_limits(struct queue_limits *lim);
1004extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
1005 sector_t offset);
1006extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev,
1007 sector_t offset);
1008extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
1009 sector_t offset);
1010extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b);
1011extern void blk_queue_dma_pad(struct request_queue *, unsigned int);
1012extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
1013extern int blk_queue_dma_drain(struct request_queue *q,
1014 dma_drain_needed_fn *dma_drain_needed,
1015 void *buf, unsigned int size);
1016extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn);
1017extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
1018extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
1019extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn);
1020extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn);
1021extern void blk_queue_dma_alignment(struct request_queue *, int);
1022extern void blk_queue_update_dma_alignment(struct request_queue *, int);
1023extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *);
1024extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *);
1025extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
1026extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable);
1027extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
1028extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev);
1029
1030extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *);
1031extern void blk_dump_rq_flags(struct request *, char *);
1032extern long nr_blockdev_pages(void);
1033
1034bool __must_check blk_get_queue(struct request_queue *);
1035struct request_queue *blk_alloc_queue(gfp_t);
1036struct request_queue *blk_alloc_queue_node(gfp_t, int);
1037extern void blk_put_queue(struct request_queue *);
1038extern void blk_set_queue_dying(struct request_queue *);
1039
1040
1041
1042
1043#ifdef CONFIG_PM
1044extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev);
1045extern int blk_pre_runtime_suspend(struct request_queue *q);
1046extern void blk_post_runtime_suspend(struct request_queue *q, int err);
1047extern void blk_pre_runtime_resume(struct request_queue *q);
1048extern void blk_post_runtime_resume(struct request_queue *q, int err);
1049extern void blk_set_runtime_active(struct request_queue *q);
1050#else
1051static inline void blk_pm_runtime_init(struct request_queue *q,
1052 struct device *dev) {}
1053static inline int blk_pre_runtime_suspend(struct request_queue *q)
1054{
1055 return -ENOSYS;
1056}
1057static inline void blk_post_runtime_suspend(struct request_queue *q, int err) {}
1058static inline void blk_pre_runtime_resume(struct request_queue *q) {}
1059static inline void blk_post_runtime_resume(struct request_queue *q, int err) {}
1060extern inline void blk_set_runtime_active(struct request_queue *q) {}
1061#endif
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075struct blk_plug {
1076 struct list_head list;
1077 struct list_head mq_list;
1078 struct list_head cb_list;
1079};
1080#define BLK_MAX_REQUEST_COUNT 16
1081
1082struct blk_plug_cb;
1083typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
1084struct blk_plug_cb {
1085 struct list_head list;
1086 blk_plug_cb_fn callback;
1087 void *data;
1088};
1089extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
1090 void *data, int size);
1091extern void blk_start_plug(struct blk_plug *);
1092extern void blk_finish_plug(struct blk_plug *);
1093extern void blk_flush_plug_list(struct blk_plug *, bool);
1094
1095static inline void blk_flush_plug(struct task_struct *tsk)
1096{
1097 struct blk_plug *plug = tsk->plug;
1098
1099 if (plug)
1100 blk_flush_plug_list(plug, false);
1101}
1102
1103static inline void blk_schedule_flush_plug(struct task_struct *tsk)
1104{
1105 struct blk_plug *plug = tsk->plug;
1106
1107 if (plug)
1108 blk_flush_plug_list(plug, true);
1109}
1110
1111static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1112{
1113 struct blk_plug *plug = tsk->plug;
1114
1115 return plug &&
1116 (!list_empty(&plug->list) ||
1117 !list_empty(&plug->mq_list) ||
1118 !list_empty(&plug->cb_list));
1119}
1120
1121
1122
1123
1124extern int blk_queue_start_tag(struct request_queue *, struct request *);
1125extern struct request *blk_queue_find_tag(struct request_queue *, int);
1126extern void blk_queue_end_tag(struct request_queue *, struct request *);
1127extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *, int);
1128extern void blk_queue_free_tags(struct request_queue *);
1129extern int blk_queue_resize_tags(struct request_queue *, int);
1130extern void blk_queue_invalidate_tags(struct request_queue *);
1131extern struct blk_queue_tag *blk_init_tags(int, int);
1132extern void blk_free_tags(struct blk_queue_tag *);
1133
1134static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt,
1135 int tag)
1136{
1137 if (unlikely(bqt == NULL || tag >= bqt->real_max_depth))
1138 return NULL;
1139 return bqt->tag_index[tag];
1140}
1141
1142
1143#define BLKDEV_DISCARD_SECURE (1 << 0)
1144#define BLKDEV_DISCARD_ZERO (1 << 1)
1145
1146extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *);
1147extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1148 sector_t nr_sects, gfp_t gfp_mask, unsigned long flags);
1149extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1150 sector_t nr_sects, gfp_t gfp_mask, int flags,
1151 struct bio **biop);
1152extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
1153 sector_t nr_sects, gfp_t gfp_mask, struct page *page);
1154extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1155 sector_t nr_sects, gfp_t gfp_mask, bool discard);
1156static inline int sb_issue_discard(struct super_block *sb, sector_t block,
1157 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
1158{
1159 return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9),
1160 nr_blocks << (sb->s_blocksize_bits - 9),
1161 gfp_mask, flags);
1162}
1163static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
1164 sector_t nr_blocks, gfp_t gfp_mask)
1165{
1166 return blkdev_issue_zeroout(sb->s_bdev,
1167 block << (sb->s_blocksize_bits - 9),
1168 nr_blocks << (sb->s_blocksize_bits - 9),
1169 gfp_mask, true);
1170}
1171
1172extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm);
1173
1174enum blk_default_limits {
1175 BLK_MAX_SEGMENTS = 128,
1176 BLK_SAFE_MAX_SECTORS = 255,
1177 BLK_DEF_MAX_SECTORS = 2560,
1178 BLK_MAX_SEGMENT_SIZE = 65536,
1179 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
1180};
1181
1182#define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
1183
1184static inline unsigned long queue_bounce_pfn(struct request_queue *q)
1185{
1186 return q->limits.bounce_pfn;
1187}
1188
1189static inline unsigned long queue_segment_boundary(struct request_queue *q)
1190{
1191 return q->limits.seg_boundary_mask;
1192}
1193
1194static inline unsigned long queue_virt_boundary(struct request_queue *q)
1195{
1196 return q->limits.virt_boundary_mask;
1197}
1198
1199static inline unsigned int queue_max_sectors(struct request_queue *q)
1200{
1201 return q->limits.max_sectors;
1202}
1203
1204static inline unsigned int queue_max_hw_sectors(struct request_queue *q)
1205{
1206 return q->limits.max_hw_sectors;
1207}
1208
1209static inline unsigned short queue_max_segments(struct request_queue *q)
1210{
1211 return q->limits.max_segments;
1212}
1213
1214static inline unsigned int queue_max_segment_size(struct request_queue *q)
1215{
1216 return q->limits.max_segment_size;
1217}
1218
1219static inline unsigned short queue_logical_block_size(struct request_queue *q)
1220{
1221 int retval = 512;
1222
1223 if (q && q->limits.logical_block_size)
1224 retval = q->limits.logical_block_size;
1225
1226 return retval;
1227}
1228
1229static inline unsigned short bdev_logical_block_size(struct block_device *bdev)
1230{
1231 return queue_logical_block_size(bdev_get_queue(bdev));
1232}
1233
1234static inline unsigned int queue_physical_block_size(struct request_queue *q)
1235{
1236 return q->limits.physical_block_size;
1237}
1238
1239static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
1240{
1241 return queue_physical_block_size(bdev_get_queue(bdev));
1242}
1243
1244static inline unsigned int queue_io_min(struct request_queue *q)
1245{
1246 return q->limits.io_min;
1247}
1248
1249static inline int bdev_io_min(struct block_device *bdev)
1250{
1251 return queue_io_min(bdev_get_queue(bdev));
1252}
1253
1254static inline unsigned int queue_io_opt(struct request_queue *q)
1255{
1256 return q->limits.io_opt;
1257}
1258
1259static inline int bdev_io_opt(struct block_device *bdev)
1260{
1261 return queue_io_opt(bdev_get_queue(bdev));
1262}
1263
1264static inline int queue_alignment_offset(struct request_queue *q)
1265{
1266 if (q->limits.misaligned)
1267 return -1;
1268
1269 return q->limits.alignment_offset;
1270}
1271
1272static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector)
1273{
1274 unsigned int granularity = max(lim->physical_block_size, lim->io_min);
1275 unsigned int alignment = sector_div(sector, granularity >> 9) << 9;
1276
1277 return (granularity + lim->alignment_offset - alignment) % granularity;
1278}
1279
1280static inline int bdev_alignment_offset(struct block_device *bdev)
1281{
1282 struct request_queue *q = bdev_get_queue(bdev);
1283
1284 if (q->limits.misaligned)
1285 return -1;
1286
1287 if (bdev != bdev->bd_contains)
1288 return bdev->bd_part->alignment_offset;
1289
1290 return q->limits.alignment_offset;
1291}
1292
1293static inline int queue_discard_alignment(struct request_queue *q)
1294{
1295 if (q->limits.discard_misaligned)
1296 return -1;
1297
1298 return q->limits.discard_alignment;
1299}
1300
1301static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector)
1302{
1303 unsigned int alignment, granularity, offset;
1304
1305 if (!lim->max_discard_sectors)
1306 return 0;
1307
1308
1309 alignment = lim->discard_alignment >> 9;
1310 granularity = lim->discard_granularity >> 9;
1311 if (!granularity)
1312 return 0;
1313
1314
1315 offset = sector_div(sector, granularity);
1316
1317
1318 offset = (granularity + alignment - offset) % granularity;
1319
1320
1321 return offset << 9;
1322}
1323
1324static inline int bdev_discard_alignment(struct block_device *bdev)
1325{
1326 struct request_queue *q = bdev_get_queue(bdev);
1327
1328 if (bdev != bdev->bd_contains)
1329 return bdev->bd_part->discard_alignment;
1330
1331 return q->limits.discard_alignment;
1332}
1333
1334static inline unsigned int queue_discard_zeroes_data(struct request_queue *q)
1335{
1336 if (q->limits.max_discard_sectors && q->limits.discard_zeroes_data == 1)
1337 return 1;
1338
1339 return 0;
1340}
1341
1342static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev)
1343{
1344 return queue_discard_zeroes_data(bdev_get_queue(bdev));
1345}
1346
1347static inline unsigned int bdev_write_same(struct block_device *bdev)
1348{
1349 struct request_queue *q = bdev_get_queue(bdev);
1350
1351 if (q)
1352 return q->limits.max_write_same_sectors;
1353
1354 return 0;
1355}
1356
1357static inline int queue_dma_alignment(struct request_queue *q)
1358{
1359 return q ? q->dma_alignment : 511;
1360}
1361
1362static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
1363 unsigned int len)
1364{
1365 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
1366 return !(addr & alignment) && !(len & alignment);
1367}
1368
1369
1370static inline unsigned int blksize_bits(unsigned int size)
1371{
1372 unsigned int bits = 8;
1373 do {
1374 bits++;
1375 size >>= 1;
1376 } while (size > 256);
1377 return bits;
1378}
1379
1380static inline unsigned int block_size(struct block_device *bdev)
1381{
1382 return bdev->bd_block_size;
1383}
1384
1385static inline bool queue_flush_queueable(struct request_queue *q)
1386{
1387 return !test_bit(QUEUE_FLAG_FLUSH_NQ, &q->queue_flags);
1388}
1389
1390typedef struct {struct page *v;} Sector;
1391
1392unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *);
1393
1394static inline void put_dev_sector(Sector p)
1395{
1396 put_page(p.v);
1397}
1398
1399static inline bool __bvec_gap_to_prev(struct request_queue *q,
1400 struct bio_vec *bprv, unsigned int offset)
1401{
1402 return offset ||
1403 ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
1404}
1405
1406
1407
1408
1409
1410static inline bool bvec_gap_to_prev(struct request_queue *q,
1411 struct bio_vec *bprv, unsigned int offset)
1412{
1413 if (!queue_virt_boundary(q))
1414 return false;
1415 return __bvec_gap_to_prev(q, bprv, offset);
1416}
1417
1418static inline bool bio_will_gap(struct request_queue *q, struct bio *prev,
1419 struct bio *next)
1420{
1421 if (bio_has_data(prev) && queue_virt_boundary(q)) {
1422 struct bio_vec pb, nb;
1423
1424 bio_get_last_bvec(prev, &pb);
1425 bio_get_first_bvec(next, &nb);
1426
1427 return __bvec_gap_to_prev(q, &pb, nb.bv_offset);
1428 }
1429
1430 return false;
1431}
1432
1433static inline bool req_gap_back_merge(struct request *req, struct bio *bio)
1434{
1435 return bio_will_gap(req->q, req->biotail, bio);
1436}
1437
1438static inline bool req_gap_front_merge(struct request *req, struct bio *bio)
1439{
1440 return bio_will_gap(req->q, bio, req->bio);
1441}
1442
1443int kblockd_schedule_work(struct work_struct *work);
1444int kblockd_schedule_work_on(int cpu, struct work_struct *work);
1445int kblockd_schedule_delayed_work(struct delayed_work *dwork, unsigned long delay);
1446int kblockd_schedule_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
1447
1448#ifdef CONFIG_BLK_CGROUP
1449
1450
1451
1452
1453
1454static inline void set_start_time_ns(struct request *req)
1455{
1456 preempt_disable();
1457 req->start_time_ns = sched_clock();
1458 preempt_enable();
1459}
1460
1461static inline void set_io_start_time_ns(struct request *req)
1462{
1463 preempt_disable();
1464 req->io_start_time_ns = sched_clock();
1465 preempt_enable();
1466}
1467
1468static inline uint64_t rq_start_time_ns(struct request *req)
1469{
1470 return req->start_time_ns;
1471}
1472
1473static inline uint64_t rq_io_start_time_ns(struct request *req)
1474{
1475 return req->io_start_time_ns;
1476}
1477#else
1478static inline void set_start_time_ns(struct request *req) {}
1479static inline void set_io_start_time_ns(struct request *req) {}
1480static inline uint64_t rq_start_time_ns(struct request *req)
1481{
1482 return 0;
1483}
1484static inline uint64_t rq_io_start_time_ns(struct request *req)
1485{
1486 return 0;
1487}
1488#endif
1489
1490#define MODULE_ALIAS_BLOCKDEV(major,minor) \
1491 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1492#define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1493 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1494
1495#if defined(CONFIG_BLK_DEV_INTEGRITY)
1496
1497enum blk_integrity_flags {
1498 BLK_INTEGRITY_VERIFY = 1 << 0,
1499 BLK_INTEGRITY_GENERATE = 1 << 1,
1500 BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2,
1501 BLK_INTEGRITY_IP_CHECKSUM = 1 << 3,
1502};
1503
1504struct blk_integrity_iter {
1505 void *prot_buf;
1506 void *data_buf;
1507 sector_t seed;
1508 unsigned int data_size;
1509 unsigned short interval;
1510 const char *disk_name;
1511};
1512
1513typedef int (integrity_processing_fn) (struct blk_integrity_iter *);
1514
1515struct blk_integrity_profile {
1516 integrity_processing_fn *generate_fn;
1517 integrity_processing_fn *verify_fn;
1518 const char *name;
1519};
1520
1521extern void blk_integrity_register(struct gendisk *, struct blk_integrity *);
1522extern void blk_integrity_unregister(struct gendisk *);
1523extern int blk_integrity_compare(struct gendisk *, struct gendisk *);
1524extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *,
1525 struct scatterlist *);
1526extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *);
1527extern bool blk_integrity_merge_rq(struct request_queue *, struct request *,
1528 struct request *);
1529extern bool blk_integrity_merge_bio(struct request_queue *, struct request *,
1530 struct bio *);
1531
1532static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1533{
1534 struct blk_integrity *bi = &disk->queue->integrity;
1535
1536 if (!bi->profile)
1537 return NULL;
1538
1539 return bi;
1540}
1541
1542static inline
1543struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
1544{
1545 return blk_get_integrity(bdev->bd_disk);
1546}
1547
1548static inline bool blk_integrity_rq(struct request *rq)
1549{
1550 return rq->cmd_flags & REQ_INTEGRITY;
1551}
1552
1553static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1554 unsigned int segs)
1555{
1556 q->limits.max_integrity_segments = segs;
1557}
1558
1559static inline unsigned short
1560queue_max_integrity_segments(struct request_queue *q)
1561{
1562 return q->limits.max_integrity_segments;
1563}
1564
1565static inline bool integrity_req_gap_back_merge(struct request *req,
1566 struct bio *next)
1567{
1568 struct bio_integrity_payload *bip = bio_integrity(req->bio);
1569 struct bio_integrity_payload *bip_next = bio_integrity(next);
1570
1571 return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
1572 bip_next->bip_vec[0].bv_offset);
1573}
1574
1575static inline bool integrity_req_gap_front_merge(struct request *req,
1576 struct bio *bio)
1577{
1578 struct bio_integrity_payload *bip = bio_integrity(bio);
1579 struct bio_integrity_payload *bip_next = bio_integrity(req->bio);
1580
1581 return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
1582 bip_next->bip_vec[0].bv_offset);
1583}
1584
1585#else
1586
1587struct bio;
1588struct block_device;
1589struct gendisk;
1590struct blk_integrity;
1591
1592static inline int blk_integrity_rq(struct request *rq)
1593{
1594 return 0;
1595}
1596static inline int blk_rq_count_integrity_sg(struct request_queue *q,
1597 struct bio *b)
1598{
1599 return 0;
1600}
1601static inline int blk_rq_map_integrity_sg(struct request_queue *q,
1602 struct bio *b,
1603 struct scatterlist *s)
1604{
1605 return 0;
1606}
1607static inline struct blk_integrity *bdev_get_integrity(struct block_device *b)
1608{
1609 return NULL;
1610}
1611static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1612{
1613 return NULL;
1614}
1615static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b)
1616{
1617 return 0;
1618}
1619static inline void blk_integrity_register(struct gendisk *d,
1620 struct blk_integrity *b)
1621{
1622}
1623static inline void blk_integrity_unregister(struct gendisk *d)
1624{
1625}
1626static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1627 unsigned int segs)
1628{
1629}
1630static inline unsigned short queue_max_integrity_segments(struct request_queue *q)
1631{
1632 return 0;
1633}
1634static inline bool blk_integrity_merge_rq(struct request_queue *rq,
1635 struct request *r1,
1636 struct request *r2)
1637{
1638 return true;
1639}
1640static inline bool blk_integrity_merge_bio(struct request_queue *rq,
1641 struct request *r,
1642 struct bio *b)
1643{
1644 return true;
1645}
1646
1647static inline bool integrity_req_gap_back_merge(struct request *req,
1648 struct bio *next)
1649{
1650 return false;
1651}
1652static inline bool integrity_req_gap_front_merge(struct request *req,
1653 struct bio *bio)
1654{
1655 return false;
1656}
1657
1658#endif
1659
1660
1661
1662
1663
1664
1665
1666
1667struct blk_dax_ctl {
1668 sector_t sector;
1669 void *addr;
1670 long size;
1671 pfn_t pfn;
1672};
1673
1674struct block_device_operations {
1675 int (*open) (struct block_device *, fmode_t);
1676 void (*release) (struct gendisk *, fmode_t);
1677 int (*rw_page)(struct block_device *, sector_t, struct page *, bool);
1678 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1679 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1680 long (*direct_access)(struct block_device *, sector_t, void **, pfn_t *,
1681 long);
1682 unsigned int (*check_events) (struct gendisk *disk,
1683 unsigned int clearing);
1684
1685 int (*media_changed) (struct gendisk *);
1686 void (*unlock_native_capacity) (struct gendisk *);
1687 int (*revalidate_disk) (struct gendisk *);
1688 int (*getgeo)(struct block_device *, struct hd_geometry *);
1689
1690 void (*swap_slot_free_notify) (struct block_device *, unsigned long);
1691 struct module *owner;
1692 const struct pr_ops *pr_ops;
1693};
1694
1695extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int,
1696 unsigned long);
1697extern int bdev_read_page(struct block_device *, sector_t, struct page *);
1698extern int bdev_write_page(struct block_device *, sector_t, struct page *,
1699 struct writeback_control *);
1700extern long bdev_direct_access(struct block_device *, struct blk_dax_ctl *);
1701extern int bdev_dax_supported(struct super_block *, int);
1702extern bool bdev_dax_capable(struct block_device *);
1703#else
1704
1705struct block_device;
1706
1707
1708
1709
1710#define buffer_heads_over_limit 0
1711
1712static inline long nr_blockdev_pages(void)
1713{
1714 return 0;
1715}
1716
1717struct blk_plug {
1718};
1719
1720static inline void blk_start_plug(struct blk_plug *plug)
1721{
1722}
1723
1724static inline void blk_finish_plug(struct blk_plug *plug)
1725{
1726}
1727
1728static inline void blk_flush_plug(struct task_struct *task)
1729{
1730}
1731
1732static inline void blk_schedule_flush_plug(struct task_struct *task)
1733{
1734}
1735
1736
1737static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1738{
1739 return false;
1740}
1741
1742static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask,
1743 sector_t *error_sector)
1744{
1745 return 0;
1746}
1747
1748#endif
1749
1750#endif
1751