1 #ifndef _LINUX_BLKDEV_H
2 #define _LINUX_BLKDEV_H
4 #include <linux/sched.h>
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>
26 #include <asm/scatterlist.h>
29 struct scsi_ioctl_command
;
32 struct elevator_queue
;
33 struct request_pm_state
;
39 struct blk_flush_queue
;
41 #define BLKDEV_MIN_RQ 4
42 #define BLKDEV_MAX_RQ 128 /* Default maximum */
45 * Maximum number of blkcg policies allowed to be registered concurrently.
46 * Defined here to simplify include dependency.
48 #define BLKCG_MAX_POLS 2
51 typedef void (rq_end_io_fn
)(struct request
*, int);
53 #define BLK_RL_SYNCFULL (1U << 0)
54 #define BLK_RL_ASYNCFULL (1U << 1)
57 struct request_queue
*q
; /* the queue this rl belongs to */
58 #ifdef CONFIG_BLK_CGROUP
59 struct blkcg_gq
*blkg
; /* blkg this request pool belongs to */
62 * count[], starved[], and wait[] are indexed by
63 * BLK_RW_SYNC/BLK_RW_ASYNC
68 wait_queue_head_t wait
[2];
73 * request command types
75 enum rq_cmd_type_bits
{
76 REQ_TYPE_FS
= 1, /* fs request */
77 REQ_TYPE_BLOCK_PC
, /* scsi command */
78 REQ_TYPE_SENSE
, /* sense request */
79 REQ_TYPE_PM_SUSPEND
, /* suspend request */
80 REQ_TYPE_PM_RESUME
, /* resume request */
81 REQ_TYPE_PM_SHUTDOWN
, /* shutdown request */
82 REQ_TYPE_DRV_PRIV
, /* driver defined types from here */
85 #define BLK_MAX_CDB 16
88 * Try to put the fields that are referenced together in the same cacheline.
90 * If you modify this structure, make sure to update blk_rq_init() and
91 * especially blk_mq_rq_ctx_init() to take care of the added fields.
94 struct list_head queuelist
;
96 struct call_single_data csd
;
97 unsigned long fifo_time
;
100 struct request_queue
*q
;
101 struct blk_mq_ctx
*mq_ctx
;
105 unsigned long atomic_flags
;
109 /* the following two fields are internal, NEVER access directly */
110 unsigned int __data_len
; /* total data len */
111 sector_t __sector
; /* sector cursor */
117 * The hash is used inside the scheduler, and killed once the
118 * request reaches the dispatch list. The ipi_list is only used
119 * to queue the request for softirq completion, which is long
120 * after the request has been unhashed (and even removed from
121 * the dispatch list).
124 struct hlist_node hash
; /* merge hash */
125 struct list_head ipi_list
;
129 * The rb_node is only used inside the io scheduler, requests
130 * are pruned when moved to the dispatch queue. So let the
131 * completion_data share space with the rb_node.
134 struct rb_node rb_node
; /* sort/lookup */
135 void *completion_data
;
139 * Three pointers are available for the IO schedulers, if they need
140 * more they have to dynamically allocate it. Flush requests are
141 * never put on the IO scheduler. So let the flush fields share
142 * space with the elevator data.
152 struct list_head list
;
153 rq_end_io_fn
*saved_end_io
;
157 struct gendisk
*rq_disk
;
158 struct hd_struct
*part
;
159 unsigned long start_time
;
160 #ifdef CONFIG_BLK_CGROUP
161 struct request_list
*rl
; /* rl this rq is alloced from */
162 unsigned long long start_time_ns
;
163 unsigned long long io_start_time_ns
; /* when passed to hardware */
165 /* Number of scatter-gather DMA addr+len pairs after
166 * physical address coalescing is performed.
168 unsigned short nr_phys_segments
;
169 #if defined(CONFIG_BLK_DEV_INTEGRITY)
170 unsigned short nr_integrity_segments
;
173 unsigned short ioprio
;
175 void *special
; /* opaque pointer available for LLD use */
181 * when request is used as a packet command carrier
183 unsigned char __cmd
[BLK_MAX_CDB
];
185 unsigned short cmd_len
;
187 unsigned int extra_len
; /* length of alignment and padding */
188 unsigned int sense_len
;
189 unsigned int resid_len
; /* residual count */
192 unsigned long deadline
;
193 struct list_head timeout_list
;
194 unsigned int timeout
;
198 * completion callback.
200 rq_end_io_fn
*end_io
;
204 struct request
*next_rq
;
207 static inline unsigned short req_get_ioprio(struct request
*req
)
213 * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME
214 * requests. Some step values could eventually be made generic.
216 struct request_pm_state
218 /* PM state machine step value, currently driver specific */
220 /* requested PM state value (S1, S2, S3, S4, ...) */
222 void* data
; /* for driver use */
225 #include <linux/elevator.h>
227 struct blk_queue_ctx
;
229 typedef void (request_fn_proc
) (struct request_queue
*q
);
230 typedef void (make_request_fn
) (struct request_queue
*q
, struct bio
*bio
);
231 typedef int (prep_rq_fn
) (struct request_queue
*, struct request
*);
232 typedef void (unprep_rq_fn
) (struct request_queue
*, struct request
*);
235 struct bvec_merge_data
{
236 struct block_device
*bi_bdev
;
241 typedef int (merge_bvec_fn
) (struct request_queue
*, struct bvec_merge_data
*,
243 typedef void (softirq_done_fn
)(struct request
*);
244 typedef int (dma_drain_needed_fn
)(struct request
*);
245 typedef int (lld_busy_fn
) (struct request_queue
*q
);
246 typedef int (bsg_job_fn
) (struct bsg_job
*);
248 enum blk_eh_timer_return
{
254 typedef enum blk_eh_timer_return (rq_timed_out_fn
)(struct request
*);
256 enum blk_queue_state
{
261 struct blk_queue_tag
{
262 struct request
**tag_index
; /* map of busy tags */
263 unsigned long *tag_map
; /* bit map of free/busy tags */
264 int busy
; /* current depth */
265 int max_depth
; /* what we will send to device */
266 int real_max_depth
; /* what the array can hold */
267 atomic_t refcnt
; /* map can be shared */
268 int alloc_policy
; /* tag allocation policy */
269 int next_tag
; /* next tag */
271 #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */
272 #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */
274 #define BLK_SCSI_MAX_CMDS (256)
275 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
277 struct queue_limits
{
278 unsigned long bounce_pfn
;
279 unsigned long seg_boundary_mask
;
281 unsigned int max_hw_sectors
;
282 unsigned int chunk_sectors
;
283 unsigned int max_sectors
;
284 unsigned int max_segment_size
;
285 unsigned int physical_block_size
;
286 unsigned int alignment_offset
;
289 unsigned int max_discard_sectors
;
290 unsigned int max_write_same_sectors
;
291 unsigned int discard_granularity
;
292 unsigned int discard_alignment
;
294 unsigned short logical_block_size
;
295 unsigned short max_segments
;
296 unsigned short max_integrity_segments
;
298 unsigned char misaligned
;
299 unsigned char discard_misaligned
;
300 unsigned char cluster
;
301 unsigned char discard_zeroes_data
;
302 unsigned char raid_partial_stripes_expensive
;
305 struct request_queue
{
307 * Together with queue_head for cacheline sharing
309 struct list_head queue_head
;
310 struct request
*last_merge
;
311 struct elevator_queue
*elevator
;
312 int nr_rqs
[2]; /* # allocated [a]sync rqs */
313 int nr_rqs_elvpriv
; /* # allocated rqs w/ elvpriv */
316 * If blkcg is not used, @q->root_rl serves all requests. If blkcg
317 * is used, root blkg allocates from @q->root_rl and all other
318 * blkgs from their own blkg->rl. Which one to use should be
319 * determined using bio_request_list().
321 struct request_list root_rl
;
323 request_fn_proc
*request_fn
;
324 make_request_fn
*make_request_fn
;
325 prep_rq_fn
*prep_rq_fn
;
326 unprep_rq_fn
*unprep_rq_fn
;
327 merge_bvec_fn
*merge_bvec_fn
;
328 softirq_done_fn
*softirq_done_fn
;
329 rq_timed_out_fn
*rq_timed_out_fn
;
330 dma_drain_needed_fn
*dma_drain_needed
;
331 lld_busy_fn
*lld_busy_fn
;
333 struct blk_mq_ops
*mq_ops
;
335 unsigned int *mq_map
;
338 struct blk_mq_ctx __percpu
*queue_ctx
;
339 unsigned int nr_queues
;
341 /* hw dispatch queues */
342 struct blk_mq_hw_ctx
**queue_hw_ctx
;
343 unsigned int nr_hw_queues
;
346 * Dispatch queue sorting
349 struct request
*boundary_rq
;
352 * Delayed queue handling
354 struct delayed_work delay_work
;
356 struct backing_dev_info backing_dev_info
;
359 * The queue owner gets to use this for whatever they like.
360 * ll_rw_blk doesn't touch it.
365 * various queue flags, see QUEUE_* below
367 unsigned long queue_flags
;
370 * ida allocated id for this queue. Used to index queues from
376 * queue needs bounce pages for pages above this limit
381 * protects queue structures from reentrancy. ->__queue_lock should
382 * _never_ be used directly, it is queue private. always use
385 spinlock_t __queue_lock
;
386 spinlock_t
*queue_lock
;
396 struct kobject mq_kobj
;
401 unsigned int nr_pending
;
407 unsigned long nr_requests
; /* Max # of requests */
408 unsigned int nr_congestion_on
;
409 unsigned int nr_congestion_off
;
410 unsigned int nr_batching
;
412 unsigned int dma_drain_size
;
413 void *dma_drain_buffer
;
414 unsigned int dma_pad_mask
;
415 unsigned int dma_alignment
;
417 struct blk_queue_tag
*queue_tags
;
418 struct list_head tag_busy_list
;
420 unsigned int nr_sorted
;
421 unsigned int in_flight
[2];
423 * Number of active block driver functions for which blk_drain_queue()
424 * must wait. Must be incremented around functions that unlock the
425 * queue_lock internally, e.g. scsi_request_fn().
427 unsigned int request_fn_active
;
429 unsigned int rq_timeout
;
430 struct timer_list timeout
;
431 struct list_head timeout_list
;
433 struct list_head icq_list
;
434 #ifdef CONFIG_BLK_CGROUP
435 DECLARE_BITMAP (blkcg_pols
, BLKCG_MAX_POLS
);
436 struct blkcg_gq
*root_blkg
;
437 struct list_head blkg_list
;
440 struct queue_limits limits
;
445 unsigned int sg_timeout
;
446 unsigned int sg_reserved_size
;
448 #ifdef CONFIG_BLK_DEV_IO_TRACE
449 struct blk_trace
*blk_trace
;
452 * for flush operations
454 unsigned int flush_flags
;
455 unsigned int flush_not_queueable
:1;
456 struct blk_flush_queue
*fq
;
458 struct list_head requeue_list
;
459 spinlock_t requeue_lock
;
460 struct work_struct requeue_work
;
462 struct mutex sysfs_lock
;
467 #if defined(CONFIG_BLK_DEV_BSG)
468 bsg_job_fn
*bsg_job_fn
;
470 struct bsg_class_device bsg_dev
;
473 #ifdef CONFIG_BLK_DEV_THROTTLING
475 struct throtl_data
*td
;
477 struct rcu_head rcu_head
;
478 wait_queue_head_t mq_freeze_wq
;
479 struct percpu_ref mq_usage_counter
;
480 struct list_head all_q_node
;
482 struct blk_mq_tag_set
*tag_set
;
483 struct list_head tag_set_list
;
486 #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */
487 #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */
488 #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */
489 #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */
490 #define QUEUE_FLAG_DYING 5 /* queue being torn down */
491 #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */
492 #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */
493 #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */
494 #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */
495 #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */
496 #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */
497 #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */
498 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
499 #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */
500 #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */
501 #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */
502 #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */
503 #define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */
504 #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */
505 #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */
506 #define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */
507 #define QUEUE_FLAG_NO_SG_MERGE 21 /* don't attempt to merge SG segments*/
508 #define QUEUE_FLAG_SG_GAPS 22 /* queue doesn't support SG gaps */
510 #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
511 (1 << QUEUE_FLAG_STACKABLE) | \
512 (1 << QUEUE_FLAG_SAME_COMP) | \
513 (1 << QUEUE_FLAG_ADD_RANDOM))
515 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
516 (1 << QUEUE_FLAG_STACKABLE) | \
517 (1 << QUEUE_FLAG_SAME_COMP))
519 static inline void queue_lockdep_assert_held(struct request_queue
*q
)
522 lockdep_assert_held(q
->queue_lock
);
525 static inline void queue_flag_set_unlocked(unsigned int flag
,
526 struct request_queue
*q
)
528 __set_bit(flag
, &q
->queue_flags
);
531 static inline int queue_flag_test_and_clear(unsigned int flag
,
532 struct request_queue
*q
)
534 queue_lockdep_assert_held(q
);
536 if (test_bit(flag
, &q
->queue_flags
)) {
537 __clear_bit(flag
, &q
->queue_flags
);
544 static inline int queue_flag_test_and_set(unsigned int flag
,
545 struct request_queue
*q
)
547 queue_lockdep_assert_held(q
);
549 if (!test_bit(flag
, &q
->queue_flags
)) {
550 __set_bit(flag
, &q
->queue_flags
);
557 static inline void queue_flag_set(unsigned int flag
, struct request_queue
*q
)
559 queue_lockdep_assert_held(q
);
560 __set_bit(flag
, &q
->queue_flags
);
563 static inline void queue_flag_clear_unlocked(unsigned int flag
,
564 struct request_queue
*q
)
566 __clear_bit(flag
, &q
->queue_flags
);
569 static inline int queue_in_flight(struct request_queue
*q
)
571 return q
->in_flight
[0] + q
->in_flight
[1];
574 static inline void queue_flag_clear(unsigned int flag
, struct request_queue
*q
)
576 queue_lockdep_assert_held(q
);
577 __clear_bit(flag
, &q
->queue_flags
);
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_secdiscard(q) (blk_queue_discard(q) && \
596 test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags))
598 #define blk_noretry_request(rq) \
599 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
600 REQ_FAILFAST_DRIVER))
602 #define blk_account_rq(rq) \
603 (((rq)->cmd_flags & REQ_STARTED) && \
604 ((rq)->cmd_type == REQ_TYPE_FS))
606 #define blk_pm_request(rq) \
607 ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \
608 (rq)->cmd_type == REQ_TYPE_PM_RESUME)
610 #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
611 #define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
612 /* rq->queuelist of dequeued request must be list_empty() */
613 #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
615 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
617 #define rq_data_dir(rq) (((rq)->cmd_flags & 1) != 0)
620 * Driver can handle struct request, if it either has an old style
621 * request_fn defined, or is blk-mq based.
623 static inline bool queue_is_rq_based(struct request_queue
*q
)
625 return q
->request_fn
|| q
->mq_ops
;
628 static inline unsigned int blk_queue_cluster(struct request_queue
*q
)
630 return q
->limits
.cluster
;
634 * We regard a request as sync, if either a read or a sync write
636 static inline bool rw_is_sync(unsigned int rw_flags
)
638 return !(rw_flags
& REQ_WRITE
) || (rw_flags
& REQ_SYNC
);
641 static inline bool rq_is_sync(struct request
*rq
)
643 return rw_is_sync(rq
->cmd_flags
);
646 static inline bool blk_rl_full(struct request_list
*rl
, bool sync
)
648 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
650 return rl
->flags
& flag
;
653 static inline void blk_set_rl_full(struct request_list
*rl
, bool sync
)
655 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
660 static inline void blk_clear_rl_full(struct request_list
*rl
, bool sync
)
662 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
667 static inline bool rq_mergeable(struct request
*rq
)
669 if (rq
->cmd_type
!= REQ_TYPE_FS
)
672 if (rq
->cmd_flags
& REQ_NOMERGE_FLAGS
)
678 static inline bool blk_check_merge_flags(unsigned int flags1
,
681 if ((flags1
& REQ_DISCARD
) != (flags2
& REQ_DISCARD
))
684 if ((flags1
& REQ_SECURE
) != (flags2
& REQ_SECURE
))
687 if ((flags1
& REQ_WRITE_SAME
) != (flags2
& REQ_WRITE_SAME
))
693 static inline bool blk_write_same_mergeable(struct bio
*a
, struct bio
*b
)
695 if (bio_data(a
) == bio_data(b
))
702 * q->prep_rq_fn return values
704 #define BLKPREP_OK 0 /* serve it */
705 #define BLKPREP_KILL 1 /* fatal error, kill */
706 #define BLKPREP_DEFER 2 /* leave on queue */
708 extern unsigned long blk_max_low_pfn
, blk_max_pfn
;
711 * standard bounce addresses:
713 * BLK_BOUNCE_HIGH : bounce all highmem pages
714 * BLK_BOUNCE_ANY : don't bounce anything
715 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
718 #if BITS_PER_LONG == 32
719 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
721 #define BLK_BOUNCE_HIGH -1ULL
723 #define BLK_BOUNCE_ANY (-1ULL)
724 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
727 * default timeout for SG_IO if none specified
729 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
730 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
733 extern int init_emergency_isa_pool(void);
734 extern void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
);
736 static inline int init_emergency_isa_pool(void)
740 static inline void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
)
743 #endif /* CONFIG_MMU */
749 unsigned long offset
;
754 struct req_iterator
{
755 struct bvec_iter iter
;
759 /* This should not be used directly - use rq_for_each_segment */
760 #define for_each_bio(_bio) \
761 for (; _bio; _bio = _bio->bi_next)
762 #define __rq_for_each_bio(_bio, rq) \
764 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
766 #define rq_for_each_segment(bvl, _rq, _iter) \
767 __rq_for_each_bio(_iter.bio, _rq) \
768 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
770 #define rq_iter_last(bvec, _iter) \
771 (_iter.bio->bi_next == NULL && \
772 bio_iter_last(bvec, _iter.iter))
774 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
775 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
777 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
778 extern void rq_flush_dcache_pages(struct request
*rq
);
780 static inline void rq_flush_dcache_pages(struct request
*rq
)
785 extern int blk_register_queue(struct gendisk
*disk
);
786 extern void blk_unregister_queue(struct gendisk
*disk
);
787 extern void generic_make_request(struct bio
*bio
);
788 extern void blk_rq_init(struct request_queue
*q
, struct request
*rq
);
789 extern void blk_put_request(struct request
*);
790 extern void __blk_put_request(struct request_queue
*, struct request
*);
791 extern struct request
*blk_get_request(struct request_queue
*, int, gfp_t
);
792 extern struct request
*blk_make_request(struct request_queue
*, struct bio
*,
794 extern void blk_rq_set_block_pc(struct request
*);
795 extern void blk_requeue_request(struct request_queue
*, struct request
*);
796 extern void blk_add_request_payload(struct request
*rq
, struct page
*page
,
798 extern int blk_rq_check_limits(struct request_queue
*q
, struct request
*rq
);
799 extern int blk_lld_busy(struct request_queue
*q
);
800 extern int blk_rq_prep_clone(struct request
*rq
, struct request
*rq_src
,
801 struct bio_set
*bs
, gfp_t gfp_mask
,
802 int (*bio_ctr
)(struct bio
*, struct bio
*, void *),
804 extern void blk_rq_unprep_clone(struct request
*rq
);
805 extern int blk_insert_cloned_request(struct request_queue
*q
,
807 extern void blk_delay_queue(struct request_queue
*, unsigned long);
808 extern void blk_recount_segments(struct request_queue
*, struct bio
*);
809 extern int scsi_verify_blk_ioctl(struct block_device
*, unsigned int);
810 extern int scsi_cmd_blk_ioctl(struct block_device
*, fmode_t
,
811 unsigned int, void __user
*);
812 extern int scsi_cmd_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
813 unsigned int, void __user
*);
814 extern int sg_scsi_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
815 struct scsi_ioctl_command __user
*);
817 extern void blk_queue_bio(struct request_queue
*q
, struct bio
*bio
);
820 * A queue has just exitted congestion. Note this in the global counter of
821 * congested queues, and wake up anyone who was waiting for requests to be
824 static inline void blk_clear_queue_congested(struct request_queue
*q
, int sync
)
826 clear_bdi_congested(&q
->backing_dev_info
, sync
);
830 * A queue has just entered congestion. Flag that in the queue's VM-visible
831 * state flags and increment the global gounter of congested queues.
833 static inline void blk_set_queue_congested(struct request_queue
*q
, int sync
)
835 set_bdi_congested(&q
->backing_dev_info
, sync
);
838 extern void blk_start_queue(struct request_queue
*q
);
839 extern void blk_stop_queue(struct request_queue
*q
);
840 extern void blk_sync_queue(struct request_queue
*q
);
841 extern void __blk_stop_queue(struct request_queue
*q
);
842 extern void __blk_run_queue(struct request_queue
*q
);
843 extern void blk_run_queue(struct request_queue
*);
844 extern void blk_run_queue_async(struct request_queue
*q
);
845 extern int blk_rq_map_user(struct request_queue
*, struct request
*,
846 struct rq_map_data
*, void __user
*, unsigned long,
848 extern int blk_rq_unmap_user(struct bio
*);
849 extern int blk_rq_map_kern(struct request_queue
*, struct request
*, void *, unsigned int, gfp_t
);
850 extern int blk_rq_map_user_iov(struct request_queue
*, struct request
*,
851 struct rq_map_data
*, const struct iov_iter
*,
853 extern int blk_execute_rq(struct request_queue
*, struct gendisk
*,
854 struct request
*, int);
855 extern void blk_execute_rq_nowait(struct request_queue
*, struct gendisk
*,
856 struct request
*, int, rq_end_io_fn
*);
858 static inline struct request_queue
*bdev_get_queue(struct block_device
*bdev
)
860 return bdev
->bd_disk
->queue
; /* this is never NULL */
864 * blk_rq_pos() : the current sector
865 * blk_rq_bytes() : bytes left in the entire request
866 * blk_rq_cur_bytes() : bytes left in the current segment
867 * blk_rq_err_bytes() : bytes left till the next error boundary
868 * blk_rq_sectors() : sectors left in the entire request
869 * blk_rq_cur_sectors() : sectors left in the current segment
871 static inline sector_t
blk_rq_pos(const struct request
*rq
)
876 static inline unsigned int blk_rq_bytes(const struct request
*rq
)
878 return rq
->__data_len
;
881 static inline int blk_rq_cur_bytes(const struct request
*rq
)
883 return rq
->bio
? bio_cur_bytes(rq
->bio
) : 0;
886 extern unsigned int blk_rq_err_bytes(const struct request
*rq
);
888 static inline unsigned int blk_rq_sectors(const struct request
*rq
)
890 return blk_rq_bytes(rq
) >> 9;
893 static inline unsigned int blk_rq_cur_sectors(const struct request
*rq
)
895 return blk_rq_cur_bytes(rq
) >> 9;
898 static inline unsigned int blk_queue_get_max_sectors(struct request_queue
*q
,
899 unsigned int cmd_flags
)
901 if (unlikely(cmd_flags
& REQ_DISCARD
))
902 return min(q
->limits
.max_discard_sectors
, UINT_MAX
>> 9);
904 if (unlikely(cmd_flags
& REQ_WRITE_SAME
))
905 return q
->limits
.max_write_same_sectors
;
907 return q
->limits
.max_sectors
;
911 * Return maximum size of a request at given offset. Only valid for
912 * file system requests.
914 static inline unsigned int blk_max_size_offset(struct request_queue
*q
,
917 if (!q
->limits
.chunk_sectors
)
918 return q
->limits
.max_sectors
;
920 return q
->limits
.chunk_sectors
-
921 (offset
& (q
->limits
.chunk_sectors
- 1));
924 static inline unsigned int blk_rq_get_max_sectors(struct request
*rq
)
926 struct request_queue
*q
= rq
->q
;
928 if (unlikely(rq
->cmd_type
== REQ_TYPE_BLOCK_PC
))
929 return q
->limits
.max_hw_sectors
;
931 if (!q
->limits
.chunk_sectors
)
932 return blk_queue_get_max_sectors(q
, rq
->cmd_flags
);
934 return min(blk_max_size_offset(q
, blk_rq_pos(rq
)),
935 blk_queue_get_max_sectors(q
, rq
->cmd_flags
));
938 static inline unsigned int blk_rq_count_bios(struct request
*rq
)
940 unsigned int nr_bios
= 0;
943 __rq_for_each_bio(bio
, rq
)
950 * Request issue related functions.
952 extern struct request
*blk_peek_request(struct request_queue
*q
);
953 extern void blk_start_request(struct request
*rq
);
954 extern struct request
*blk_fetch_request(struct request_queue
*q
);
957 * Request completion related functions.
959 * blk_update_request() completes given number of bytes and updates
960 * the request without completing it.
962 * blk_end_request() and friends. __blk_end_request() must be called
963 * with the request queue spinlock acquired.
965 * Several drivers define their own end_request and call
966 * blk_end_request() for parts of the original function.
967 * This prevents code duplication in drivers.
969 extern bool blk_update_request(struct request
*rq
, int error
,
970 unsigned int nr_bytes
);
971 extern void blk_finish_request(struct request
*rq
, int error
);
972 extern bool blk_end_request(struct request
*rq
, int error
,
973 unsigned int nr_bytes
);
974 extern void blk_end_request_all(struct request
*rq
, int error
);
975 extern bool blk_end_request_cur(struct request
*rq
, int error
);
976 extern bool blk_end_request_err(struct request
*rq
, int error
);
977 extern bool __blk_end_request(struct request
*rq
, int error
,
978 unsigned int nr_bytes
);
979 extern void __blk_end_request_all(struct request
*rq
, int error
);
980 extern bool __blk_end_request_cur(struct request
*rq
, int error
);
981 extern bool __blk_end_request_err(struct request
*rq
, int error
);
983 extern void blk_complete_request(struct request
*);
984 extern void __blk_complete_request(struct request
*);
985 extern void blk_abort_request(struct request
*);
986 extern void blk_unprep_request(struct request
*);
989 * Access functions for manipulating queue properties
991 extern struct request_queue
*blk_init_queue_node(request_fn_proc
*rfn
,
992 spinlock_t
*lock
, int node_id
);
993 extern struct request_queue
*blk_init_queue(request_fn_proc
*, spinlock_t
*);
994 extern struct request_queue
*blk_init_allocated_queue(struct request_queue
*,
995 request_fn_proc
*, spinlock_t
*);
996 extern void blk_cleanup_queue(struct request_queue
*);
997 extern void blk_queue_make_request(struct request_queue
*, make_request_fn
*);
998 extern void blk_queue_bounce_limit(struct request_queue
*, u64
);
999 extern void blk_limits_max_hw_sectors(struct queue_limits
*, unsigned int);
1000 extern void blk_queue_max_hw_sectors(struct request_queue
*, unsigned int);
1001 extern void blk_queue_chunk_sectors(struct request_queue
*, unsigned int);
1002 extern void blk_queue_max_segments(struct request_queue
*, unsigned short);
1003 extern void blk_queue_max_segment_size(struct request_queue
*, unsigned int);
1004 extern void blk_queue_max_discard_sectors(struct request_queue
*q
,
1005 unsigned int max_discard_sectors
);
1006 extern void blk_queue_max_write_same_sectors(struct request_queue
*q
,
1007 unsigned int max_write_same_sectors
);
1008 extern void blk_queue_logical_block_size(struct request_queue
*, unsigned short);
1009 extern void blk_queue_physical_block_size(struct request_queue
*, unsigned int);
1010 extern void blk_queue_alignment_offset(struct request_queue
*q
,
1011 unsigned int alignment
);
1012 extern void blk_limits_io_min(struct queue_limits
*limits
, unsigned int min
);
1013 extern void blk_queue_io_min(struct request_queue
*q
, unsigned int min
);
1014 extern void blk_limits_io_opt(struct queue_limits
*limits
, unsigned int opt
);
1015 extern void blk_queue_io_opt(struct request_queue
*q
, unsigned int opt
);
1016 extern void blk_set_default_limits(struct queue_limits
*lim
);
1017 extern void blk_set_stacking_limits(struct queue_limits
*lim
);
1018 extern int blk_stack_limits(struct queue_limits
*t
, struct queue_limits
*b
,
1020 extern int bdev_stack_limits(struct queue_limits
*t
, struct block_device
*bdev
,
1022 extern void disk_stack_limits(struct gendisk
*disk
, struct block_device
*bdev
,
1024 extern void blk_queue_stack_limits(struct request_queue
*t
, struct request_queue
*b
);
1025 extern void blk_queue_dma_pad(struct request_queue
*, unsigned int);
1026 extern void blk_queue_update_dma_pad(struct request_queue
*, unsigned int);
1027 extern int blk_queue_dma_drain(struct request_queue
*q
,
1028 dma_drain_needed_fn
*dma_drain_needed
,
1029 void *buf
, unsigned int size
);
1030 extern void blk_queue_lld_busy(struct request_queue
*q
, lld_busy_fn
*fn
);
1031 extern void blk_queue_segment_boundary(struct request_queue
*, unsigned long);
1032 extern void blk_queue_prep_rq(struct request_queue
*, prep_rq_fn
*pfn
);
1033 extern void blk_queue_unprep_rq(struct request_queue
*, unprep_rq_fn
*ufn
);
1034 extern void blk_queue_merge_bvec(struct request_queue
*, merge_bvec_fn
*);
1035 extern void blk_queue_dma_alignment(struct request_queue
*, int);
1036 extern void blk_queue_update_dma_alignment(struct request_queue
*, int);
1037 extern void blk_queue_softirq_done(struct request_queue
*, softirq_done_fn
*);
1038 extern void blk_queue_rq_timed_out(struct request_queue
*, rq_timed_out_fn
*);
1039 extern void blk_queue_rq_timeout(struct request_queue
*, unsigned int);
1040 extern void blk_queue_flush(struct request_queue
*q
, unsigned int flush
);
1041 extern void blk_queue_flush_queueable(struct request_queue
*q
, bool queueable
);
1042 extern struct backing_dev_info
*blk_get_backing_dev_info(struct block_device
*bdev
);
1044 extern int blk_rq_map_sg(struct request_queue
*, struct request
*, struct scatterlist
*);
1045 extern void blk_dump_rq_flags(struct request
*, char *);
1046 extern long nr_blockdev_pages(void);
1048 bool __must_check
blk_get_queue(struct request_queue
*);
1049 struct request_queue
*blk_alloc_queue(gfp_t
);
1050 struct request_queue
*blk_alloc_queue_node(gfp_t
, int);
1051 extern void blk_put_queue(struct request_queue
*);
1054 * block layer runtime pm functions
1057 extern void blk_pm_runtime_init(struct request_queue
*q
, struct device
*dev
);
1058 extern int blk_pre_runtime_suspend(struct request_queue
*q
);
1059 extern void blk_post_runtime_suspend(struct request_queue
*q
, int err
);
1060 extern void blk_pre_runtime_resume(struct request_queue
*q
);
1061 extern void blk_post_runtime_resume(struct request_queue
*q
, int err
);
1063 static inline void blk_pm_runtime_init(struct request_queue
*q
,
1064 struct device
*dev
) {}
1065 static inline int blk_pre_runtime_suspend(struct request_queue
*q
)
1069 static inline void blk_post_runtime_suspend(struct request_queue
*q
, int err
) {}
1070 static inline void blk_pre_runtime_resume(struct request_queue
*q
) {}
1071 static inline void blk_post_runtime_resume(struct request_queue
*q
, int err
) {}
1075 * blk_plug permits building a queue of related requests by holding the I/O
1076 * fragments for a short period. This allows merging of sequential requests
1077 * into single larger request. As the requests are moved from a per-task list to
1078 * the device's request_queue in a batch, this results in improved scalability
1079 * as the lock contention for request_queue lock is reduced.
1081 * It is ok not to disable preemption when adding the request to the plug list
1082 * or when attempting a merge, because blk_schedule_flush_list() will only flush
1083 * the plug list when the task sleeps by itself. For details, please see
1084 * schedule() where blk_schedule_flush_plug() is called.
1087 struct list_head list
; /* requests */
1088 struct list_head mq_list
; /* blk-mq requests */
1089 struct list_head cb_list
; /* md requires an unplug callback */
1091 #define BLK_MAX_REQUEST_COUNT 16
1094 typedef void (*blk_plug_cb_fn
)(struct blk_plug_cb
*, bool);
1095 struct blk_plug_cb
{
1096 struct list_head list
;
1097 blk_plug_cb_fn callback
;
1100 extern struct blk_plug_cb
*blk_check_plugged(blk_plug_cb_fn unplug
,
1101 void *data
, int size
);
1102 extern void blk_start_plug(struct blk_plug
*);
1103 extern void blk_finish_plug(struct blk_plug
*);
1104 extern void blk_flush_plug_list(struct blk_plug
*, bool);
1106 static inline void blk_flush_plug(struct task_struct
*tsk
)
1108 struct blk_plug
*plug
= tsk
->plug
;
1111 blk_flush_plug_list(plug
, false);
1114 static inline void blk_schedule_flush_plug(struct task_struct
*tsk
)
1116 struct blk_plug
*plug
= tsk
->plug
;
1119 blk_flush_plug_list(plug
, true);
1122 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1124 struct blk_plug
*plug
= tsk
->plug
;
1127 (!list_empty(&plug
->list
) ||
1128 !list_empty(&plug
->mq_list
) ||
1129 !list_empty(&plug
->cb_list
));
1135 extern int blk_queue_start_tag(struct request_queue
*, struct request
*);
1136 extern struct request
*blk_queue_find_tag(struct request_queue
*, int);
1137 extern void blk_queue_end_tag(struct request_queue
*, struct request
*);
1138 extern int blk_queue_init_tags(struct request_queue
*, int, struct blk_queue_tag
*, int);
1139 extern void blk_queue_free_tags(struct request_queue
*);
1140 extern int blk_queue_resize_tags(struct request_queue
*, int);
1141 extern void blk_queue_invalidate_tags(struct request_queue
*);
1142 extern struct blk_queue_tag
*blk_init_tags(int, int);
1143 extern void blk_free_tags(struct blk_queue_tag
*);
1145 static inline struct request
*blk_map_queue_find_tag(struct blk_queue_tag
*bqt
,
1148 if (unlikely(bqt
== NULL
|| tag
>= bqt
->real_max_depth
))
1150 return bqt
->tag_index
[tag
];
1153 #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */
1155 extern int blkdev_issue_flush(struct block_device
*, gfp_t
, sector_t
*);
1156 extern int blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1157 sector_t nr_sects
, gfp_t gfp_mask
, unsigned long flags
);
1158 extern int blkdev_issue_write_same(struct block_device
*bdev
, sector_t sector
,
1159 sector_t nr_sects
, gfp_t gfp_mask
, struct page
*page
);
1160 extern int blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1161 sector_t nr_sects
, gfp_t gfp_mask
, bool discard
);
1162 static inline int sb_issue_discard(struct super_block
*sb
, sector_t block
,
1163 sector_t nr_blocks
, gfp_t gfp_mask
, unsigned long flags
)
1165 return blkdev_issue_discard(sb
->s_bdev
, block
<< (sb
->s_blocksize_bits
- 9),
1166 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1169 static inline int sb_issue_zeroout(struct super_block
*sb
, sector_t block
,
1170 sector_t nr_blocks
, gfp_t gfp_mask
)
1172 return blkdev_issue_zeroout(sb
->s_bdev
,
1173 block
<< (sb
->s_blocksize_bits
- 9),
1174 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1178 extern int blk_verify_command(unsigned char *cmd
, fmode_t has_write_perm
);
1180 enum blk_default_limits
{
1181 BLK_MAX_SEGMENTS
= 128,
1182 BLK_SAFE_MAX_SECTORS
= 255,
1183 BLK_MAX_SEGMENT_SIZE
= 65536,
1184 BLK_SEG_BOUNDARY_MASK
= 0xFFFFFFFFUL
,
1187 #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
1189 static inline unsigned long queue_bounce_pfn(struct request_queue
*q
)
1191 return q
->limits
.bounce_pfn
;
1194 static inline unsigned long queue_segment_boundary(struct request_queue
*q
)
1196 return q
->limits
.seg_boundary_mask
;
1199 static inline unsigned int queue_max_sectors(struct request_queue
*q
)
1201 return q
->limits
.max_sectors
;
1204 static inline unsigned int queue_max_hw_sectors(struct request_queue
*q
)
1206 return q
->limits
.max_hw_sectors
;
1209 static inline unsigned short queue_max_segments(struct request_queue
*q
)
1211 return q
->limits
.max_segments
;
1214 static inline unsigned int queue_max_segment_size(struct request_queue
*q
)
1216 return q
->limits
.max_segment_size
;
1219 static inline unsigned short queue_logical_block_size(struct request_queue
*q
)
1223 if (q
&& q
->limits
.logical_block_size
)
1224 retval
= q
->limits
.logical_block_size
;
1229 static inline unsigned short bdev_logical_block_size(struct block_device
*bdev
)
1231 return queue_logical_block_size(bdev_get_queue(bdev
));
1234 static inline unsigned int queue_physical_block_size(struct request_queue
*q
)
1236 return q
->limits
.physical_block_size
;
1239 static inline unsigned int bdev_physical_block_size(struct block_device
*bdev
)
1241 return queue_physical_block_size(bdev_get_queue(bdev
));
1244 static inline unsigned int queue_io_min(struct request_queue
*q
)
1246 return q
->limits
.io_min
;
1249 static inline int bdev_io_min(struct block_device
*bdev
)
1251 return queue_io_min(bdev_get_queue(bdev
));
1254 static inline unsigned int queue_io_opt(struct request_queue
*q
)
1256 return q
->limits
.io_opt
;
1259 static inline int bdev_io_opt(struct block_device
*bdev
)
1261 return queue_io_opt(bdev_get_queue(bdev
));
1264 static inline int queue_alignment_offset(struct request_queue
*q
)
1266 if (q
->limits
.misaligned
)
1269 return q
->limits
.alignment_offset
;
1272 static inline int queue_limit_alignment_offset(struct queue_limits
*lim
, sector_t sector
)
1274 unsigned int granularity
= max(lim
->physical_block_size
, lim
->io_min
);
1275 unsigned int alignment
= sector_div(sector
, granularity
>> 9) << 9;
1277 return (granularity
+ lim
->alignment_offset
- alignment
) % granularity
;
1280 static inline int bdev_alignment_offset(struct block_device
*bdev
)
1282 struct request_queue
*q
= bdev_get_queue(bdev
);
1284 if (q
->limits
.misaligned
)
1287 if (bdev
!= bdev
->bd_contains
)
1288 return bdev
->bd_part
->alignment_offset
;
1290 return q
->limits
.alignment_offset
;
1293 static inline int queue_discard_alignment(struct request_queue
*q
)
1295 if (q
->limits
.discard_misaligned
)
1298 return q
->limits
.discard_alignment
;
1301 static inline int queue_limit_discard_alignment(struct queue_limits
*lim
, sector_t sector
)
1303 unsigned int alignment
, granularity
, offset
;
1305 if (!lim
->max_discard_sectors
)
1308 /* Why are these in bytes, not sectors? */
1309 alignment
= lim
->discard_alignment
>> 9;
1310 granularity
= lim
->discard_granularity
>> 9;
1314 /* Offset of the partition start in 'granularity' sectors */
1315 offset
= sector_div(sector
, granularity
);
1317 /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1318 offset
= (granularity
+ alignment
- offset
) % granularity
;
1320 /* Turn it back into bytes, gaah */
1324 static inline int bdev_discard_alignment(struct block_device
*bdev
)
1326 struct request_queue
*q
= bdev_get_queue(bdev
);
1328 if (bdev
!= bdev
->bd_contains
)
1329 return bdev
->bd_part
->discard_alignment
;
1331 return q
->limits
.discard_alignment
;
1334 static inline unsigned int queue_discard_zeroes_data(struct request_queue
*q
)
1336 if (q
->limits
.max_discard_sectors
&& q
->limits
.discard_zeroes_data
== 1)
1342 static inline unsigned int bdev_discard_zeroes_data(struct block_device
*bdev
)
1344 return queue_discard_zeroes_data(bdev_get_queue(bdev
));
1347 static inline unsigned int bdev_write_same(struct block_device
*bdev
)
1349 struct request_queue
*q
= bdev_get_queue(bdev
);
1352 return q
->limits
.max_write_same_sectors
;
1357 static inline int queue_dma_alignment(struct request_queue
*q
)
1359 return q
? q
->dma_alignment
: 511;
1362 static inline int blk_rq_aligned(struct request_queue
*q
, unsigned long addr
,
1365 unsigned int alignment
= queue_dma_alignment(q
) | q
->dma_pad_mask
;
1366 return !(addr
& alignment
) && !(len
& alignment
);
1369 /* assumes size > 256 */
1370 static inline unsigned int blksize_bits(unsigned int size
)
1372 unsigned int bits
= 8;
1376 } while (size
> 256);
1380 static inline unsigned int block_size(struct block_device
*bdev
)
1382 return bdev
->bd_block_size
;
1385 static inline bool queue_flush_queueable(struct request_queue
*q
)
1387 return !q
->flush_not_queueable
;
1390 typedef struct {struct page
*v
;} Sector
;
1392 unsigned char *read_dev_sector(struct block_device
*, sector_t
, Sector
*);
1394 static inline void put_dev_sector(Sector p
)
1396 page_cache_release(p
.v
);
1400 int kblockd_schedule_work(struct work_struct
*work
);
1401 int kblockd_schedule_delayed_work(struct delayed_work
*dwork
, unsigned long delay
);
1402 int kblockd_schedule_delayed_work_on(int cpu
, struct delayed_work
*dwork
, unsigned long delay
);
1404 #ifdef CONFIG_BLK_CGROUP
1406 * This should not be using sched_clock(). A real patch is in progress
1407 * to fix this up, until that is in place we need to disable preemption
1408 * around sched_clock() in this function and set_io_start_time_ns().
1410 static inline void set_start_time_ns(struct request
*req
)
1413 req
->start_time_ns
= sched_clock();
1417 static inline void set_io_start_time_ns(struct request
*req
)
1420 req
->io_start_time_ns
= sched_clock();
1424 static inline uint64_t rq_start_time_ns(struct request
*req
)
1426 return req
->start_time_ns
;
1429 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1431 return req
->io_start_time_ns
;
1434 static inline void set_start_time_ns(struct request
*req
) {}
1435 static inline void set_io_start_time_ns(struct request
*req
) {}
1436 static inline uint64_t rq_start_time_ns(struct request
*req
)
1440 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1446 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1447 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1448 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1449 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1451 #if defined(CONFIG_BLK_DEV_INTEGRITY)
1453 enum blk_integrity_flags
{
1454 BLK_INTEGRITY_VERIFY
= 1 << 0,
1455 BLK_INTEGRITY_GENERATE
= 1 << 1,
1456 BLK_INTEGRITY_DEVICE_CAPABLE
= 1 << 2,
1457 BLK_INTEGRITY_IP_CHECKSUM
= 1 << 3,
1460 struct blk_integrity_iter
{
1464 unsigned int data_size
;
1465 unsigned short interval
;
1466 const char *disk_name
;
1469 typedef int (integrity_processing_fn
) (struct blk_integrity_iter
*);
1471 struct blk_integrity
{
1472 integrity_processing_fn
*generate_fn
;
1473 integrity_processing_fn
*verify_fn
;
1475 unsigned short flags
;
1476 unsigned short tuple_size
;
1477 unsigned short interval
;
1478 unsigned short tag_size
;
1482 struct kobject kobj
;
1485 extern bool blk_integrity_is_initialized(struct gendisk
*);
1486 extern int blk_integrity_register(struct gendisk
*, struct blk_integrity
*);
1487 extern void blk_integrity_unregister(struct gendisk
*);
1488 extern int blk_integrity_compare(struct gendisk
*, struct gendisk
*);
1489 extern int blk_rq_map_integrity_sg(struct request_queue
*, struct bio
*,
1490 struct scatterlist
*);
1491 extern int blk_rq_count_integrity_sg(struct request_queue
*, struct bio
*);
1492 extern bool blk_integrity_merge_rq(struct request_queue
*, struct request
*,
1494 extern bool blk_integrity_merge_bio(struct request_queue
*, struct request
*,
1498 struct blk_integrity
*bdev_get_integrity(struct block_device
*bdev
)
1500 return bdev
->bd_disk
->integrity
;
1503 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1505 return disk
->integrity
;
1508 static inline bool blk_integrity_rq(struct request
*rq
)
1510 return rq
->cmd_flags
& REQ_INTEGRITY
;
1513 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1516 q
->limits
.max_integrity_segments
= segs
;
1519 static inline unsigned short
1520 queue_max_integrity_segments(struct request_queue
*q
)
1522 return q
->limits
.max_integrity_segments
;
1525 #else /* CONFIG_BLK_DEV_INTEGRITY */
1528 struct block_device
;
1530 struct blk_integrity
;
1532 static inline int blk_integrity_rq(struct request
*rq
)
1536 static inline int blk_rq_count_integrity_sg(struct request_queue
*q
,
1541 static inline int blk_rq_map_integrity_sg(struct request_queue
*q
,
1543 struct scatterlist
*s
)
1547 static inline struct blk_integrity
*bdev_get_integrity(struct block_device
*b
)
1551 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1555 static inline int blk_integrity_compare(struct gendisk
*a
, struct gendisk
*b
)
1559 static inline int blk_integrity_register(struct gendisk
*d
,
1560 struct blk_integrity
*b
)
1564 static inline void blk_integrity_unregister(struct gendisk
*d
)
1567 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1571 static inline unsigned short queue_max_integrity_segments(struct request_queue
*q
)
1575 static inline bool blk_integrity_merge_rq(struct request_queue
*rq
,
1581 static inline bool blk_integrity_merge_bio(struct request_queue
*rq
,
1587 static inline bool blk_integrity_is_initialized(struct gendisk
*g
)
1592 #endif /* CONFIG_BLK_DEV_INTEGRITY */
1594 struct block_device_operations
{
1595 int (*open
) (struct block_device
*, fmode_t
);
1596 void (*release
) (struct gendisk
*, fmode_t
);
1597 int (*rw_page
)(struct block_device
*, sector_t
, struct page
*, int rw
);
1598 int (*ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1599 int (*compat_ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1600 long (*direct_access
)(struct block_device
*, sector_t
,
1601 void **, unsigned long *pfn
, long size
);
1602 unsigned int (*check_events
) (struct gendisk
*disk
,
1603 unsigned int clearing
);
1604 /* ->media_changed() is DEPRECATED, use ->check_events() instead */
1605 int (*media_changed
) (struct gendisk
*);
1606 void (*unlock_native_capacity
) (struct gendisk
*);
1607 int (*revalidate_disk
) (struct gendisk
*);
1608 int (*getgeo
)(struct block_device
*, struct hd_geometry
*);
1609 /* this callback is with swap_lock and sometimes page table lock held */
1610 void (*swap_slot_free_notify
) (struct block_device
*, unsigned long);
1611 struct module
*owner
;
1614 extern int __blkdev_driver_ioctl(struct block_device
*, fmode_t
, unsigned int,
1616 extern int bdev_read_page(struct block_device
*, sector_t
, struct page
*);
1617 extern int bdev_write_page(struct block_device
*, sector_t
, struct page
*,
1618 struct writeback_control
*);
1619 extern long bdev_direct_access(struct block_device
*, sector_t
, void **addr
,
1620 unsigned long *pfn
, long size
);
1621 #else /* CONFIG_BLOCK */
1623 struct block_device
;
1626 * stubs for when the block layer is configured out
1628 #define buffer_heads_over_limit 0
1630 static inline long nr_blockdev_pages(void)
1638 static inline void blk_start_plug(struct blk_plug
*plug
)
1642 static inline void blk_finish_plug(struct blk_plug
*plug
)
1646 static inline void blk_flush_plug(struct task_struct
*task
)
1650 static inline void blk_schedule_flush_plug(struct task_struct
*task
)
1655 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1660 static inline int blkdev_issue_flush(struct block_device
*bdev
, gfp_t gfp_mask
,
1661 sector_t
*error_sector
)
1666 #endif /* CONFIG_BLOCK */