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.h>
16#include <linux/wait.h>
17#include <linux/mempool.h>
18#include <linux/bio.h>
19#include <linux/stringify.h>
20#include <linux/gfp.h>
21#include <linux/bsg.h>
22#include <linux/smp.h>
23#include <linux/rcupdate.h>
24#include <linux/percpu-refcount.h>
25
26#include <asm/scatterlist.h>
27
28struct module;
29struct scsi_ioctl_command;
30
31struct request_queue;
32struct elevator_queue;
33struct request_pm_state;
34struct blk_trace;
35struct request;
36struct sg_io_hdr;
37struct bsg_job;
38struct blkcg_gq;
39
40#define BLKDEV_MIN_RQ 4
41#define BLKDEV_MAX_RQ 128
42
43
44
45
46
47#define BLKCG_MAX_POLS 2
48
49struct request;
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_SENSE,
78 REQ_TYPE_PM_SUSPEND,
79 REQ_TYPE_PM_RESUME,
80 REQ_TYPE_PM_SHUTDOWN,
81 REQ_TYPE_SPECIAL,
82
83
84
85
86
87 REQ_TYPE_ATA_TASKFILE,
88 REQ_TYPE_ATA_PC,
89};
90
91#define BLK_MAX_CDB 16
92
93
94
95
96
97
98
99struct request {
100 struct list_head queuelist;
101 union {
102 struct call_single_data csd;
103 unsigned long fifo_time;
104 };
105
106 struct request_queue *q;
107 struct blk_mq_ctx *mq_ctx;
108
109 u64 cmd_flags;
110 enum rq_cmd_type_bits cmd_type;
111 unsigned long atomic_flags;
112
113 int cpu;
114
115
116 unsigned int __data_len;
117 sector_t __sector;
118
119 struct bio *bio;
120 struct bio *biotail;
121
122
123
124
125
126
127
128
129 union {
130 struct hlist_node hash;
131 struct list_head ipi_list;
132 };
133
134
135
136
137
138
139 union {
140 struct rb_node rb_node;
141 void *completion_data;
142 };
143
144
145
146
147
148
149
150 union {
151 struct {
152 struct io_cq *icq;
153 void *priv[2];
154 } elv;
155
156 struct {
157 unsigned int seq;
158 struct list_head list;
159 rq_end_io_fn *saved_end_io;
160 } flush;
161 };
162
163 struct gendisk *rq_disk;
164 struct hd_struct *part;
165 unsigned long start_time;
166#ifdef CONFIG_BLK_CGROUP
167 struct request_list *rl;
168 unsigned long long start_time_ns;
169 unsigned long long io_start_time_ns;
170#endif
171
172
173
174 unsigned short nr_phys_segments;
175#if defined(CONFIG_BLK_DEV_INTEGRITY)
176 unsigned short nr_integrity_segments;
177#endif
178
179 unsigned short ioprio;
180
181 void *special;
182
183 int tag;
184 int errors;
185
186
187
188
189 unsigned char __cmd[BLK_MAX_CDB];
190 unsigned char *cmd;
191 unsigned short cmd_len;
192
193 unsigned int extra_len;
194 unsigned int sense_len;
195 unsigned int resid_len;
196 void *sense;
197
198 unsigned long deadline;
199 struct list_head timeout_list;
200 unsigned int timeout;
201 int retries;
202
203
204
205
206 rq_end_io_fn *end_io;
207 void *end_io_data;
208
209
210 struct request *next_rq;
211};
212
213static inline unsigned short req_get_ioprio(struct request *req)
214{
215 return req->ioprio;
216}
217
218
219
220
221
222struct request_pm_state
223{
224
225 int pm_step;
226
227 u32 pm_state;
228 void* data;
229};
230
231#include <linux/elevator.h>
232
233struct blk_queue_ctx;
234
235typedef void (request_fn_proc) (struct request_queue *q);
236typedef void (make_request_fn) (struct request_queue *q, struct bio *bio);
237typedef int (prep_rq_fn) (struct request_queue *, struct request *);
238typedef void (unprep_rq_fn) (struct request_queue *, struct request *);
239
240struct bio_vec;
241struct bvec_merge_data {
242 struct block_device *bi_bdev;
243 sector_t bi_sector;
244 unsigned bi_size;
245 unsigned long bi_rw;
246};
247typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *,
248 struct bio_vec *);
249typedef void (softirq_done_fn)(struct request *);
250typedef int (dma_drain_needed_fn)(struct request *);
251typedef int (lld_busy_fn) (struct request_queue *q);
252typedef int (bsg_job_fn) (struct bsg_job *);
253
254enum blk_eh_timer_return {
255 BLK_EH_NOT_HANDLED,
256 BLK_EH_HANDLED,
257 BLK_EH_RESET_TIMER,
258};
259
260typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *);
261
262enum blk_queue_state {
263 Queue_down,
264 Queue_up,
265};
266
267struct blk_queue_tag {
268 struct request **tag_index;
269 unsigned long *tag_map;
270 int busy;
271 int max_depth;
272 int real_max_depth;
273 atomic_t refcnt;
274};
275
276#define BLK_SCSI_MAX_CMDS (256)
277#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
278
279struct queue_limits {
280 unsigned long bounce_pfn;
281 unsigned long seg_boundary_mask;
282
283 unsigned int max_hw_sectors;
284 unsigned int chunk_sectors;
285 unsigned int max_sectors;
286 unsigned int max_segment_size;
287 unsigned int physical_block_size;
288 unsigned int alignment_offset;
289 unsigned int io_min;
290 unsigned int io_opt;
291 unsigned int max_discard_sectors;
292 unsigned int max_write_same_sectors;
293 unsigned int discard_granularity;
294 unsigned int discard_alignment;
295
296 unsigned short logical_block_size;
297 unsigned short max_segments;
298 unsigned short max_integrity_segments;
299
300 unsigned char misaligned;
301 unsigned char discard_misaligned;
302 unsigned char cluster;
303 unsigned char discard_zeroes_data;
304 unsigned char raid_partial_stripes_expensive;
305};
306
307struct request_queue {
308
309
310
311 struct list_head queue_head;
312 struct request *last_merge;
313 struct elevator_queue *elevator;
314 int nr_rqs[2];
315 int nr_rqs_elvpriv;
316
317
318
319
320
321
322
323 struct request_list root_rl;
324
325 request_fn_proc *request_fn;
326 make_request_fn *make_request_fn;
327 prep_rq_fn *prep_rq_fn;
328 unprep_rq_fn *unprep_rq_fn;
329 merge_bvec_fn *merge_bvec_fn;
330 softirq_done_fn *softirq_done_fn;
331 rq_timed_out_fn *rq_timed_out_fn;
332 dma_drain_needed_fn *dma_drain_needed;
333 lld_busy_fn *lld_busy_fn;
334
335 struct blk_mq_ops *mq_ops;
336
337 unsigned int *mq_map;
338
339
340 struct blk_mq_ctx __percpu *queue_ctx;
341 unsigned int nr_queues;
342
343
344 struct blk_mq_hw_ctx **queue_hw_ctx;
345 unsigned int nr_hw_queues;
346
347
348
349
350 sector_t end_sector;
351 struct request *boundary_rq;
352
353
354
355
356 struct delayed_work delay_work;
357
358 struct backing_dev_info backing_dev_info;
359
360
361
362
363
364 void *queuedata;
365
366
367
368
369 unsigned long queue_flags;
370
371
372
373
374
375 int id;
376
377
378
379
380 gfp_t bounce_gfp;
381
382
383
384
385
386
387 spinlock_t __queue_lock;
388 spinlock_t *queue_lock;
389
390
391
392
393 struct kobject kobj;
394
395
396
397
398 struct kobject mq_kobj;
399
400#ifdef CONFIG_PM_RUNTIME
401 struct device *dev;
402 int rpm_status;
403 unsigned int nr_pending;
404#endif
405
406
407
408
409 unsigned long nr_requests;
410 unsigned int nr_congestion_on;
411 unsigned int nr_congestion_off;
412 unsigned int nr_batching;
413
414 unsigned int dma_drain_size;
415 void *dma_drain_buffer;
416 unsigned int dma_pad_mask;
417 unsigned int dma_alignment;
418
419 struct blk_queue_tag *queue_tags;
420 struct list_head tag_busy_list;
421
422 unsigned int nr_sorted;
423 unsigned int in_flight[2];
424
425
426
427
428
429 unsigned int request_fn_active;
430
431 unsigned int rq_timeout;
432 struct timer_list timeout;
433 struct list_head timeout_list;
434
435 struct list_head icq_list;
436#ifdef CONFIG_BLK_CGROUP
437 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
438 struct blkcg_gq *root_blkg;
439 struct list_head blkg_list;
440#endif
441
442 struct queue_limits limits;
443
444
445
446
447 unsigned int sg_timeout;
448 unsigned int sg_reserved_size;
449 int node;
450#ifdef CONFIG_BLK_DEV_IO_TRACE
451 struct blk_trace *blk_trace;
452#endif
453
454
455
456 unsigned int flush_flags;
457 unsigned int flush_not_queueable:1;
458 unsigned int flush_queue_delayed:1;
459 unsigned int flush_pending_idx:1;
460 unsigned int flush_running_idx:1;
461 unsigned long flush_pending_since;
462 struct list_head flush_queue[2];
463 struct list_head flush_data_in_flight;
464 struct request *flush_rq;
465 spinlock_t mq_flush_lock;
466
467 struct list_head requeue_list;
468 spinlock_t requeue_lock;
469 struct work_struct requeue_work;
470
471 struct mutex sysfs_lock;
472
473 int bypass_depth;
474 int mq_freeze_depth;
475
476#if defined(CONFIG_BLK_DEV_BSG)
477 bsg_job_fn *bsg_job_fn;
478 int bsg_job_size;
479 struct bsg_class_device bsg_dev;
480#endif
481
482#ifdef CONFIG_BLK_DEV_THROTTLING
483
484 struct throtl_data *td;
485#endif
486 struct rcu_head rcu_head;
487 wait_queue_head_t mq_freeze_wq;
488 struct percpu_ref mq_usage_counter;
489 struct list_head all_q_node;
490
491 struct blk_mq_tag_set *tag_set;
492 struct list_head tag_set_list;
493};
494
495#define QUEUE_FLAG_QUEUED 1
496#define QUEUE_FLAG_STOPPED 2
497#define QUEUE_FLAG_SYNCFULL 3
498#define QUEUE_FLAG_ASYNCFULL 4
499#define QUEUE_FLAG_DYING 5
500#define QUEUE_FLAG_BYPASS 6
501#define QUEUE_FLAG_BIDI 7
502#define QUEUE_FLAG_NOMERGES 8
503#define QUEUE_FLAG_SAME_COMP 9
504#define QUEUE_FLAG_FAIL_IO 10
505#define QUEUE_FLAG_STACKABLE 11
506#define QUEUE_FLAG_NONROT 12
507#define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT
508#define QUEUE_FLAG_IO_STAT 13
509#define QUEUE_FLAG_DISCARD 14
510#define QUEUE_FLAG_NOXMERGES 15
511#define QUEUE_FLAG_ADD_RANDOM 16
512#define QUEUE_FLAG_SECDISCARD 17
513#define QUEUE_FLAG_SAME_FORCE 18
514#define QUEUE_FLAG_DEAD 19
515#define QUEUE_FLAG_INIT_DONE 20
516#define QUEUE_FLAG_NO_SG_MERGE 21
517#define QUEUE_FLAG_SG_GAPS 22
518
519#define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
520 (1 << QUEUE_FLAG_STACKABLE) | \
521 (1 << QUEUE_FLAG_SAME_COMP) | \
522 (1 << QUEUE_FLAG_ADD_RANDOM))
523
524#define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
525 (1 << QUEUE_FLAG_SAME_COMP))
526
527static inline void queue_lockdep_assert_held(struct request_queue *q)
528{
529 if (q->queue_lock)
530 lockdep_assert_held(q->queue_lock);
531}
532
533static inline void queue_flag_set_unlocked(unsigned int flag,
534 struct request_queue *q)
535{
536 __set_bit(flag, &q->queue_flags);
537}
538
539static inline int queue_flag_test_and_clear(unsigned int flag,
540 struct request_queue *q)
541{
542 queue_lockdep_assert_held(q);
543
544 if (test_bit(flag, &q->queue_flags)) {
545 __clear_bit(flag, &q->queue_flags);
546 return 1;
547 }
548
549 return 0;
550}
551
552static inline int queue_flag_test_and_set(unsigned int flag,
553 struct request_queue *q)
554{
555 queue_lockdep_assert_held(q);
556
557 if (!test_bit(flag, &q->queue_flags)) {
558 __set_bit(flag, &q->queue_flags);
559 return 0;
560 }
561
562 return 1;
563}
564
565static inline void queue_flag_set(unsigned int flag, struct request_queue *q)
566{
567 queue_lockdep_assert_held(q);
568 __set_bit(flag, &q->queue_flags);
569}
570
571static inline void queue_flag_clear_unlocked(unsigned int flag,
572 struct request_queue *q)
573{
574 __clear_bit(flag, &q->queue_flags);
575}
576
577static inline int queue_in_flight(struct request_queue *q)
578{
579 return q->in_flight[0] + q->in_flight[1];
580}
581
582static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
583{
584 queue_lockdep_assert_held(q);
585 __clear_bit(flag, &q->queue_flags);
586}
587
588#define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
589#define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
590#define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
591#define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
592#define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags)
593#define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
594#define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
595#define blk_queue_noxmerges(q) \
596 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
597#define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
598#define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
599#define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
600#define blk_queue_stackable(q) \
601 test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
602#define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
603#define blk_queue_secdiscard(q) (blk_queue_discard(q) && \
604 test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags))
605
606#define blk_noretry_request(rq) \
607 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
608 REQ_FAILFAST_DRIVER))
609
610#define blk_account_rq(rq) \
611 (((rq)->cmd_flags & REQ_STARTED) && \
612 ((rq)->cmd_type == REQ_TYPE_FS))
613
614#define blk_pm_request(rq) \
615 ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \
616 (rq)->cmd_type == REQ_TYPE_PM_RESUME)
617
618#define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
619#define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
620
621#define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
622
623#define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
624
625#define rq_data_dir(rq) (((rq)->cmd_flags & 1) != 0)
626
627
628
629
630
631static inline bool queue_is_rq_based(struct request_queue *q)
632{
633 return q->request_fn || q->mq_ops;
634}
635
636static inline unsigned int blk_queue_cluster(struct request_queue *q)
637{
638 return q->limits.cluster;
639}
640
641
642
643
644static inline bool rw_is_sync(unsigned int rw_flags)
645{
646 return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC);
647}
648
649static inline bool rq_is_sync(struct request *rq)
650{
651 return rw_is_sync(rq->cmd_flags);
652}
653
654static inline bool blk_rl_full(struct request_list *rl, bool sync)
655{
656 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
657
658 return rl->flags & flag;
659}
660
661static inline void blk_set_rl_full(struct request_list *rl, bool sync)
662{
663 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
664
665 rl->flags |= flag;
666}
667
668static inline void blk_clear_rl_full(struct request_list *rl, bool sync)
669{
670 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
671
672 rl->flags &= ~flag;
673}
674
675static inline bool rq_mergeable(struct request *rq)
676{
677 if (rq->cmd_type != REQ_TYPE_FS)
678 return false;
679
680 if (rq->cmd_flags & REQ_NOMERGE_FLAGS)
681 return false;
682
683 return true;
684}
685
686static inline bool blk_check_merge_flags(unsigned int flags1,
687 unsigned int flags2)
688{
689 if ((flags1 & REQ_DISCARD) != (flags2 & REQ_DISCARD))
690 return false;
691
692 if ((flags1 & REQ_SECURE) != (flags2 & REQ_SECURE))
693 return false;
694
695 if ((flags1 & REQ_WRITE_SAME) != (flags2 & REQ_WRITE_SAME))
696 return false;
697
698 return true;
699}
700
701static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b)
702{
703 if (bio_data(a) == bio_data(b))
704 return true;
705
706 return false;
707}
708
709
710
711
712#define BLKPREP_OK 0
713#define BLKPREP_KILL 1
714#define BLKPREP_DEFER 2
715
716extern unsigned long blk_max_low_pfn, blk_max_pfn;
717
718
719
720
721
722
723
724
725
726#if BITS_PER_LONG == 32
727#define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
728#else
729#define BLK_BOUNCE_HIGH -1ULL
730#endif
731#define BLK_BOUNCE_ANY (-1ULL)
732#define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
733
734
735
736
737#define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
738#define BLK_MIN_SG_TIMEOUT (7 * HZ)
739
740#ifdef CONFIG_BOUNCE
741extern int init_emergency_isa_pool(void);
742extern void blk_queue_bounce(struct request_queue *q, struct bio **bio);
743#else
744static inline int init_emergency_isa_pool(void)
745{
746 return 0;
747}
748static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio)
749{
750}
751#endif
752
753struct rq_map_data {
754 struct page **pages;
755 int page_order;
756 int nr_entries;
757 unsigned long offset;
758 int null_mapped;
759 int from_user;
760};
761
762struct req_iterator {
763 struct bvec_iter iter;
764 struct bio *bio;
765};
766
767
768#define for_each_bio(_bio) \
769 for (; _bio; _bio = _bio->bi_next)
770#define __rq_for_each_bio(_bio, rq) \
771 if ((rq->bio)) \
772 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
773
774#define rq_for_each_segment(bvl, _rq, _iter) \
775 __rq_for_each_bio(_iter.bio, _rq) \
776 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
777
778#define rq_iter_last(bvec, _iter) \
779 (_iter.bio->bi_next == NULL && \
780 bio_iter_last(bvec, _iter.iter))
781
782#ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
783# error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
784#endif
785#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
786extern void rq_flush_dcache_pages(struct request *rq);
787#else
788static inline void rq_flush_dcache_pages(struct request *rq)
789{
790}
791#endif
792
793extern int blk_register_queue(struct gendisk *disk);
794extern void blk_unregister_queue(struct gendisk *disk);
795extern void generic_make_request(struct bio *bio);
796extern void blk_rq_init(struct request_queue *q, struct request *rq);
797extern void blk_put_request(struct request *);
798extern void __blk_put_request(struct request_queue *, struct request *);
799extern struct request *blk_get_request(struct request_queue *, int, gfp_t);
800extern struct request *blk_make_request(struct request_queue *, struct bio *,
801 gfp_t);
802extern void blk_rq_set_block_pc(struct request *);
803extern void blk_requeue_request(struct request_queue *, struct request *);
804extern void blk_add_request_payload(struct request *rq, struct page *page,
805 unsigned int len);
806extern int blk_rq_check_limits(struct request_queue *q, struct request *rq);
807extern int blk_lld_busy(struct request_queue *q);
808extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
809 struct bio_set *bs, gfp_t gfp_mask,
810 int (*bio_ctr)(struct bio *, struct bio *, void *),
811 void *data);
812extern void blk_rq_unprep_clone(struct request *rq);
813extern int blk_insert_cloned_request(struct request_queue *q,
814 struct request *rq);
815extern void blk_delay_queue(struct request_queue *, unsigned long);
816extern void blk_recount_segments(struct request_queue *, struct bio *);
817extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int);
818extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t,
819 unsigned int, void __user *);
820extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
821 unsigned int, void __user *);
822extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
823 struct scsi_ioctl_command __user *);
824
825extern void blk_queue_bio(struct request_queue *q, struct bio *bio);
826
827
828
829
830
831
832static inline void blk_clear_queue_congested(struct request_queue *q, int sync)
833{
834 clear_bdi_congested(&q->backing_dev_info, sync);
835}
836
837
838
839
840
841static inline void blk_set_queue_congested(struct request_queue *q, int sync)
842{
843 set_bdi_congested(&q->backing_dev_info, sync);
844}
845
846extern void blk_start_queue(struct request_queue *q);
847extern void blk_stop_queue(struct request_queue *q);
848extern void blk_sync_queue(struct request_queue *q);
849extern void __blk_stop_queue(struct request_queue *q);
850extern void __blk_run_queue(struct request_queue *q);
851extern void blk_run_queue(struct request_queue *);
852extern void blk_run_queue_async(struct request_queue *q);
853extern int blk_rq_map_user(struct request_queue *, struct request *,
854 struct rq_map_data *, void __user *, unsigned long,
855 gfp_t);
856extern int blk_rq_unmap_user(struct bio *);
857extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t);
858extern int blk_rq_map_user_iov(struct request_queue *, struct request *,
859 struct rq_map_data *, const struct sg_iovec *,
860 int, unsigned int, gfp_t);
861extern int blk_execute_rq(struct request_queue *, struct gendisk *,
862 struct request *, int);
863extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
864 struct request *, int, rq_end_io_fn *);
865
866static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
867{
868 return bdev->bd_disk->queue;
869}
870
871
872
873
874
875
876
877
878
879static inline sector_t blk_rq_pos(const struct request *rq)
880{
881 return rq->__sector;
882}
883
884static inline unsigned int blk_rq_bytes(const struct request *rq)
885{
886 return rq->__data_len;
887}
888
889static inline int blk_rq_cur_bytes(const struct request *rq)
890{
891 return rq->bio ? bio_cur_bytes(rq->bio) : 0;
892}
893
894extern unsigned int blk_rq_err_bytes(const struct request *rq);
895
896static inline unsigned int blk_rq_sectors(const struct request *rq)
897{
898 return blk_rq_bytes(rq) >> 9;
899}
900
901static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
902{
903 return blk_rq_cur_bytes(rq) >> 9;
904}
905
906static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
907 unsigned int cmd_flags)
908{
909 if (unlikely(cmd_flags & REQ_DISCARD))
910 return min(q->limits.max_discard_sectors, UINT_MAX >> 9);
911
912 if (unlikely(cmd_flags & REQ_WRITE_SAME))
913 return q->limits.max_write_same_sectors;
914
915 return q->limits.max_sectors;
916}
917
918
919
920
921
922static inline unsigned int blk_max_size_offset(struct request_queue *q,
923 sector_t offset)
924{
925 if (!q->limits.chunk_sectors)
926 return q->limits.max_sectors;
927
928 return q->limits.chunk_sectors -
929 (offset & (q->limits.chunk_sectors - 1));
930}
931
932static inline unsigned int blk_rq_get_max_sectors(struct request *rq)
933{
934 struct request_queue *q = rq->q;
935
936 if (unlikely(rq->cmd_type == REQ_TYPE_BLOCK_PC))
937 return q->limits.max_hw_sectors;
938
939 if (!q->limits.chunk_sectors)
940 return blk_queue_get_max_sectors(q, rq->cmd_flags);
941
942 return min(blk_max_size_offset(q, blk_rq_pos(rq)),
943 blk_queue_get_max_sectors(q, rq->cmd_flags));
944}
945
946static inline unsigned int blk_rq_count_bios(struct request *rq)
947{
948 unsigned int nr_bios = 0;
949 struct bio *bio;
950
951 __rq_for_each_bio(bio, rq)
952 nr_bios++;
953
954 return nr_bios;
955}
956
957
958
959
960extern struct request *blk_peek_request(struct request_queue *q);
961extern void blk_start_request(struct request *rq);
962extern struct request *blk_fetch_request(struct request_queue *q);
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977extern bool blk_update_request(struct request *rq, int error,
978 unsigned int nr_bytes);
979extern void blk_finish_request(struct request *rq, int error);
980extern bool blk_end_request(struct request *rq, int error,
981 unsigned int nr_bytes);
982extern void blk_end_request_all(struct request *rq, int error);
983extern bool blk_end_request_cur(struct request *rq, int error);
984extern bool blk_end_request_err(struct request *rq, int error);
985extern bool __blk_end_request(struct request *rq, int error,
986 unsigned int nr_bytes);
987extern void __blk_end_request_all(struct request *rq, int error);
988extern bool __blk_end_request_cur(struct request *rq, int error);
989extern bool __blk_end_request_err(struct request *rq, int error);
990
991extern void blk_complete_request(struct request *);
992extern void __blk_complete_request(struct request *);
993extern void blk_abort_request(struct request *);
994extern void blk_unprep_request(struct request *);
995
996
997
998
999extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn,
1000 spinlock_t *lock, int node_id);
1001extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *);
1002extern struct request_queue *blk_init_allocated_queue(struct request_queue *,
1003 request_fn_proc *, spinlock_t *);
1004extern void blk_cleanup_queue(struct request_queue *);
1005extern void blk_queue_make_request(struct request_queue *, make_request_fn *);
1006extern void blk_queue_bounce_limit(struct request_queue *, u64);
1007extern void blk_limits_max_hw_sectors(struct queue_limits *, unsigned int);
1008extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
1009extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
1010extern void blk_queue_max_segments(struct request_queue *, unsigned short);
1011extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
1012extern void blk_queue_max_discard_sectors(struct request_queue *q,
1013 unsigned int max_discard_sectors);
1014extern void blk_queue_max_write_same_sectors(struct request_queue *q,
1015 unsigned int max_write_same_sectors);
1016extern void blk_queue_logical_block_size(struct request_queue *, unsigned short);
1017extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
1018extern void blk_queue_alignment_offset(struct request_queue *q,
1019 unsigned int alignment);
1020extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
1021extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
1022extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
1023extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
1024extern void blk_set_default_limits(struct queue_limits *lim);
1025extern void blk_set_stacking_limits(struct queue_limits *lim);
1026extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
1027 sector_t offset);
1028extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev,
1029 sector_t offset);
1030extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
1031 sector_t offset);
1032extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b);
1033extern void blk_queue_dma_pad(struct request_queue *, unsigned int);
1034extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
1035extern int blk_queue_dma_drain(struct request_queue *q,
1036 dma_drain_needed_fn *dma_drain_needed,
1037 void *buf, unsigned int size);
1038extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn);
1039extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
1040extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn);
1041extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn);
1042extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *);
1043extern void blk_queue_dma_alignment(struct request_queue *, int);
1044extern void blk_queue_update_dma_alignment(struct request_queue *, int);
1045extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *);
1046extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *);
1047extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
1048extern void blk_queue_flush(struct request_queue *q, unsigned int flush);
1049extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable);
1050extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev);
1051
1052extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *);
1053extern int blk_bio_map_sg(struct request_queue *q, struct bio *bio,
1054 struct scatterlist *sglist);
1055extern void blk_dump_rq_flags(struct request *, char *);
1056extern long nr_blockdev_pages(void);
1057
1058bool __must_check blk_get_queue(struct request_queue *);
1059struct request_queue *blk_alloc_queue(gfp_t);
1060struct request_queue *blk_alloc_queue_node(gfp_t, int);
1061extern void blk_put_queue(struct request_queue *);
1062
1063
1064
1065
1066#ifdef CONFIG_PM_RUNTIME
1067extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev);
1068extern int blk_pre_runtime_suspend(struct request_queue *q);
1069extern void blk_post_runtime_suspend(struct request_queue *q, int err);
1070extern void blk_pre_runtime_resume(struct request_queue *q);
1071extern void blk_post_runtime_resume(struct request_queue *q, int err);
1072#else
1073static inline void blk_pm_runtime_init(struct request_queue *q,
1074 struct device *dev) {}
1075static inline int blk_pre_runtime_suspend(struct request_queue *q)
1076{
1077 return -ENOSYS;
1078}
1079static inline void blk_post_runtime_suspend(struct request_queue *q, int err) {}
1080static inline void blk_pre_runtime_resume(struct request_queue *q) {}
1081static inline void blk_post_runtime_resume(struct request_queue *q, int err) {}
1082#endif
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096struct blk_plug {
1097 struct list_head list;
1098 struct list_head mq_list;
1099 struct list_head cb_list;
1100};
1101#define BLK_MAX_REQUEST_COUNT 16
1102
1103struct blk_plug_cb;
1104typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
1105struct blk_plug_cb {
1106 struct list_head list;
1107 blk_plug_cb_fn callback;
1108 void *data;
1109};
1110extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
1111 void *data, int size);
1112extern void blk_start_plug(struct blk_plug *);
1113extern void blk_finish_plug(struct blk_plug *);
1114extern void blk_flush_plug_list(struct blk_plug *, bool);
1115
1116static inline void blk_flush_plug(struct task_struct *tsk)
1117{
1118 struct blk_plug *plug = tsk->plug;
1119
1120 if (plug)
1121 blk_flush_plug_list(plug, false);
1122}
1123
1124static inline void blk_schedule_flush_plug(struct task_struct *tsk)
1125{
1126 struct blk_plug *plug = tsk->plug;
1127
1128 if (plug)
1129 blk_flush_plug_list(plug, true);
1130}
1131
1132static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1133{
1134 struct blk_plug *plug = tsk->plug;
1135
1136 return plug &&
1137 (!list_empty(&plug->list) ||
1138 !list_empty(&plug->mq_list) ||
1139 !list_empty(&plug->cb_list));
1140}
1141
1142
1143
1144
1145#define blk_rq_tagged(rq) \
1146 ((rq)->mq_ctx || ((rq)->cmd_flags & REQ_QUEUED))
1147extern int blk_queue_start_tag(struct request_queue *, struct request *);
1148extern struct request *blk_queue_find_tag(struct request_queue *, int);
1149extern void blk_queue_end_tag(struct request_queue *, struct request *);
1150extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *);
1151extern void blk_queue_free_tags(struct request_queue *);
1152extern int blk_queue_resize_tags(struct request_queue *, int);
1153extern void blk_queue_invalidate_tags(struct request_queue *);
1154extern struct blk_queue_tag *blk_init_tags(int);
1155extern void blk_free_tags(struct blk_queue_tag *);
1156
1157static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt,
1158 int tag)
1159{
1160 if (unlikely(bqt == NULL || tag >= bqt->real_max_depth))
1161 return NULL;
1162 return bqt->tag_index[tag];
1163}
1164
1165#define BLKDEV_DISCARD_SECURE 0x01
1166
1167extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *);
1168extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1169 sector_t nr_sects, gfp_t gfp_mask, unsigned long flags);
1170extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
1171 sector_t nr_sects, gfp_t gfp_mask, struct page *page);
1172extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1173 sector_t nr_sects, gfp_t gfp_mask);
1174static inline int sb_issue_discard(struct super_block *sb, sector_t block,
1175 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
1176{
1177 return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9),
1178 nr_blocks << (sb->s_blocksize_bits - 9),
1179 gfp_mask, flags);
1180}
1181static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
1182 sector_t nr_blocks, gfp_t gfp_mask)
1183{
1184 return blkdev_issue_zeroout(sb->s_bdev,
1185 block << (sb->s_blocksize_bits - 9),
1186 nr_blocks << (sb->s_blocksize_bits - 9),
1187 gfp_mask);
1188}
1189
1190extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm);
1191
1192enum blk_default_limits {
1193 BLK_MAX_SEGMENTS = 128,
1194 BLK_SAFE_MAX_SECTORS = 255,
1195 BLK_DEF_MAX_SECTORS = 1024,
1196 BLK_MAX_SEGMENT_SIZE = 65536,
1197 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
1198};
1199
1200#define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
1201
1202static inline unsigned long queue_bounce_pfn(struct request_queue *q)
1203{
1204 return q->limits.bounce_pfn;
1205}
1206
1207static inline unsigned long queue_segment_boundary(struct request_queue *q)
1208{
1209 return q->limits.seg_boundary_mask;
1210}
1211
1212static inline unsigned int queue_max_sectors(struct request_queue *q)
1213{
1214 return q->limits.max_sectors;
1215}
1216
1217static inline unsigned int queue_max_hw_sectors(struct request_queue *q)
1218{
1219 return q->limits.max_hw_sectors;
1220}
1221
1222static inline unsigned short queue_max_segments(struct request_queue *q)
1223{
1224 return q->limits.max_segments;
1225}
1226
1227static inline unsigned int queue_max_segment_size(struct request_queue *q)
1228{
1229 return q->limits.max_segment_size;
1230}
1231
1232static inline unsigned short queue_logical_block_size(struct request_queue *q)
1233{
1234 int retval = 512;
1235
1236 if (q && q->limits.logical_block_size)
1237 retval = q->limits.logical_block_size;
1238
1239 return retval;
1240}
1241
1242static inline unsigned short bdev_logical_block_size(struct block_device *bdev)
1243{
1244 return queue_logical_block_size(bdev_get_queue(bdev));
1245}
1246
1247static inline unsigned int queue_physical_block_size(struct request_queue *q)
1248{
1249 return q->limits.physical_block_size;
1250}
1251
1252static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
1253{
1254 return queue_physical_block_size(bdev_get_queue(bdev));
1255}
1256
1257static inline unsigned int queue_io_min(struct request_queue *q)
1258{
1259 return q->limits.io_min;
1260}
1261
1262static inline int bdev_io_min(struct block_device *bdev)
1263{
1264 return queue_io_min(bdev_get_queue(bdev));
1265}
1266
1267static inline unsigned int queue_io_opt(struct request_queue *q)
1268{
1269 return q->limits.io_opt;
1270}
1271
1272static inline int bdev_io_opt(struct block_device *bdev)
1273{
1274 return queue_io_opt(bdev_get_queue(bdev));
1275}
1276
1277static inline int queue_alignment_offset(struct request_queue *q)
1278{
1279 if (q->limits.misaligned)
1280 return -1;
1281
1282 return q->limits.alignment_offset;
1283}
1284
1285static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector)
1286{
1287 unsigned int granularity = max(lim->physical_block_size, lim->io_min);
1288 unsigned int alignment = (sector << 9) & (granularity - 1);
1289
1290 return (granularity + lim->alignment_offset - alignment)
1291 & (granularity - 1);
1292}
1293
1294static inline int bdev_alignment_offset(struct block_device *bdev)
1295{
1296 struct request_queue *q = bdev_get_queue(bdev);
1297
1298 if (q->limits.misaligned)
1299 return -1;
1300
1301 if (bdev != bdev->bd_contains)
1302 return bdev->bd_part->alignment_offset;
1303
1304 return q->limits.alignment_offset;
1305}
1306
1307static inline int queue_discard_alignment(struct request_queue *q)
1308{
1309 if (q->limits.discard_misaligned)
1310 return -1;
1311
1312 return q->limits.discard_alignment;
1313}
1314
1315static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector)
1316{
1317 unsigned int alignment, granularity, offset;
1318
1319 if (!lim->max_discard_sectors)
1320 return 0;
1321
1322
1323 alignment = lim->discard_alignment >> 9;
1324 granularity = lim->discard_granularity >> 9;
1325 if (!granularity)
1326 return 0;
1327
1328
1329 offset = sector_div(sector, granularity);
1330
1331
1332 offset = (granularity + alignment - offset) % granularity;
1333
1334
1335 return offset << 9;
1336}
1337
1338static inline int bdev_discard_alignment(struct block_device *bdev)
1339{
1340 struct request_queue *q = bdev_get_queue(bdev);
1341
1342 if (bdev != bdev->bd_contains)
1343 return bdev->bd_part->discard_alignment;
1344
1345 return q->limits.discard_alignment;
1346}
1347
1348static inline unsigned int queue_discard_zeroes_data(struct request_queue *q)
1349{
1350 if (q->limits.max_discard_sectors && q->limits.discard_zeroes_data == 1)
1351 return 1;
1352
1353 return 0;
1354}
1355
1356static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev)
1357{
1358 return queue_discard_zeroes_data(bdev_get_queue(bdev));
1359}
1360
1361static inline unsigned int bdev_write_same(struct block_device *bdev)
1362{
1363 struct request_queue *q = bdev_get_queue(bdev);
1364
1365 if (q)
1366 return q->limits.max_write_same_sectors;
1367
1368 return 0;
1369}
1370
1371static inline int queue_dma_alignment(struct request_queue *q)
1372{
1373 return q ? q->dma_alignment : 511;
1374}
1375
1376static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
1377 unsigned int len)
1378{
1379 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
1380 return !(addr & alignment) && !(len & alignment);
1381}
1382
1383
1384static inline unsigned int blksize_bits(unsigned int size)
1385{
1386 unsigned int bits = 8;
1387 do {
1388 bits++;
1389 size >>= 1;
1390 } while (size > 256);
1391 return bits;
1392}
1393
1394static inline unsigned int block_size(struct block_device *bdev)
1395{
1396 return bdev->bd_block_size;
1397}
1398
1399static inline bool queue_flush_queueable(struct request_queue *q)
1400{
1401 return !q->flush_not_queueable;
1402}
1403
1404typedef struct {struct page *v;} Sector;
1405
1406unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *);
1407
1408static inline void put_dev_sector(Sector p)
1409{
1410 page_cache_release(p.v);
1411}
1412
1413struct work_struct;
1414int kblockd_schedule_work(struct work_struct *work);
1415int kblockd_schedule_delayed_work(struct delayed_work *dwork, unsigned long delay);
1416int kblockd_schedule_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
1417
1418#ifdef CONFIG_BLK_CGROUP
1419
1420
1421
1422
1423
1424static inline void set_start_time_ns(struct request *req)
1425{
1426 preempt_disable();
1427 req->start_time_ns = sched_clock();
1428 preempt_enable();
1429}
1430
1431static inline void set_io_start_time_ns(struct request *req)
1432{
1433 preempt_disable();
1434 req->io_start_time_ns = sched_clock();
1435 preempt_enable();
1436}
1437
1438static inline uint64_t rq_start_time_ns(struct request *req)
1439{
1440 return req->start_time_ns;
1441}
1442
1443static inline uint64_t rq_io_start_time_ns(struct request *req)
1444{
1445 return req->io_start_time_ns;
1446}
1447#else
1448static inline void set_start_time_ns(struct request *req) {}
1449static inline void set_io_start_time_ns(struct request *req) {}
1450static inline uint64_t rq_start_time_ns(struct request *req)
1451{
1452 return 0;
1453}
1454static inline uint64_t rq_io_start_time_ns(struct request *req)
1455{
1456 return 0;
1457}
1458#endif
1459
1460#define MODULE_ALIAS_BLOCKDEV(major,minor) \
1461 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1462#define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1463 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1464
1465#if defined(CONFIG_BLK_DEV_INTEGRITY)
1466
1467#define INTEGRITY_FLAG_READ 2
1468#define INTEGRITY_FLAG_WRITE 4
1469
1470struct blk_integrity_exchg {
1471 void *prot_buf;
1472 void *data_buf;
1473 sector_t sector;
1474 unsigned int data_size;
1475 unsigned short sector_size;
1476 const char *disk_name;
1477};
1478
1479typedef void (integrity_gen_fn) (struct blk_integrity_exchg *);
1480typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *);
1481typedef void (integrity_set_tag_fn) (void *, void *, unsigned int);
1482typedef void (integrity_get_tag_fn) (void *, void *, unsigned int);
1483
1484struct blk_integrity {
1485 integrity_gen_fn *generate_fn;
1486 integrity_vrfy_fn *verify_fn;
1487 integrity_set_tag_fn *set_tag_fn;
1488 integrity_get_tag_fn *get_tag_fn;
1489
1490 unsigned short flags;
1491 unsigned short tuple_size;
1492 unsigned short sector_size;
1493 unsigned short tag_size;
1494
1495 const char *name;
1496
1497 struct kobject kobj;
1498};
1499
1500extern bool blk_integrity_is_initialized(struct gendisk *);
1501extern int blk_integrity_register(struct gendisk *, struct blk_integrity *);
1502extern void blk_integrity_unregister(struct gendisk *);
1503extern int blk_integrity_compare(struct gendisk *, struct gendisk *);
1504extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *,
1505 struct scatterlist *);
1506extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *);
1507extern int blk_integrity_merge_rq(struct request_queue *, struct request *,
1508 struct request *);
1509extern int blk_integrity_merge_bio(struct request_queue *, struct request *,
1510 struct bio *);
1511
1512static inline
1513struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
1514{
1515 return bdev->bd_disk->integrity;
1516}
1517
1518static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1519{
1520 return disk->integrity;
1521}
1522
1523static inline int blk_integrity_rq(struct request *rq)
1524{
1525 if (rq->bio == NULL)
1526 return 0;
1527
1528 return bio_integrity(rq->bio);
1529}
1530
1531static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1532 unsigned int segs)
1533{
1534 q->limits.max_integrity_segments = segs;
1535}
1536
1537static inline unsigned short
1538queue_max_integrity_segments(struct request_queue *q)
1539{
1540 return q->limits.max_integrity_segments;
1541}
1542
1543#else
1544
1545struct bio;
1546struct block_device;
1547struct gendisk;
1548struct blk_integrity;
1549
1550static inline int blk_integrity_rq(struct request *rq)
1551{
1552 return 0;
1553}
1554static inline int blk_rq_count_integrity_sg(struct request_queue *q,
1555 struct bio *b)
1556{
1557 return 0;
1558}
1559static inline int blk_rq_map_integrity_sg(struct request_queue *q,
1560 struct bio *b,
1561 struct scatterlist *s)
1562{
1563 return 0;
1564}
1565static inline struct blk_integrity *bdev_get_integrity(struct block_device *b)
1566{
1567 return 0;
1568}
1569static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1570{
1571 return NULL;
1572}
1573static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b)
1574{
1575 return 0;
1576}
1577static inline int blk_integrity_register(struct gendisk *d,
1578 struct blk_integrity *b)
1579{
1580 return 0;
1581}
1582static inline void blk_integrity_unregister(struct gendisk *d)
1583{
1584}
1585static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1586 unsigned int segs)
1587{
1588}
1589static inline unsigned short queue_max_integrity_segments(struct request_queue *q)
1590{
1591 return 0;
1592}
1593static inline int blk_integrity_merge_rq(struct request_queue *rq,
1594 struct request *r1,
1595 struct request *r2)
1596{
1597 return 0;
1598}
1599static inline int blk_integrity_merge_bio(struct request_queue *rq,
1600 struct request *r,
1601 struct bio *b)
1602{
1603 return 0;
1604}
1605static inline bool blk_integrity_is_initialized(struct gendisk *g)
1606{
1607 return 0;
1608}
1609
1610#endif
1611
1612struct block_device_operations {
1613 int (*open) (struct block_device *, fmode_t);
1614 void (*release) (struct gendisk *, fmode_t);
1615 int (*rw_page)(struct block_device *, sector_t, struct page *, int rw);
1616 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1617 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1618 int (*direct_access) (struct block_device *, sector_t,
1619 void **, unsigned long *);
1620 unsigned int (*check_events) (struct gendisk *disk,
1621 unsigned int clearing);
1622
1623 int (*media_changed) (struct gendisk *);
1624 void (*unlock_native_capacity) (struct gendisk *);
1625 int (*revalidate_disk) (struct gendisk *);
1626 int (*getgeo)(struct block_device *, struct hd_geometry *);
1627
1628 void (*swap_slot_free_notify) (struct block_device *, unsigned long);
1629 struct module *owner;
1630};
1631
1632extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int,
1633 unsigned long);
1634extern int bdev_read_page(struct block_device *, sector_t, struct page *);
1635extern int bdev_write_page(struct block_device *, sector_t, struct page *,
1636 struct writeback_control *);
1637#else
1638
1639struct block_device;
1640
1641
1642
1643
1644#define buffer_heads_over_limit 0
1645
1646static inline long nr_blockdev_pages(void)
1647{
1648 return 0;
1649}
1650
1651struct blk_plug {
1652};
1653
1654static inline void blk_start_plug(struct blk_plug *plug)
1655{
1656}
1657
1658static inline void blk_finish_plug(struct blk_plug *plug)
1659{
1660}
1661
1662static inline void blk_flush_plug(struct task_struct *task)
1663{
1664}
1665
1666static inline void blk_schedule_flush_plug(struct task_struct *task)
1667{
1668}
1669
1670
1671static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1672{
1673 return false;
1674}
1675
1676static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask,
1677 sector_t *error_sector)
1678{
1679 return 0;
1680}
1681
1682#endif
1683
1684#endif
1685