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>
25 #include <asm/scatterlist.h>
28 struct scsi_ioctl_command
;
31 struct elevator_queue
;
32 struct request_pm_state
;
39 #define BLKDEV_MIN_RQ 4
40 #define BLKDEV_MAX_RQ 128 /* Default maximum */
43 * Maximum number of blkcg policies allowed to be registered concurrently.
44 * Defined here to simplify include dependency.
46 #define BLKCG_MAX_POLS 2
49 typedef void (rq_end_io_fn
)(struct request
*, int);
51 #define BLK_RL_SYNCFULL (1U << 0)
52 #define BLK_RL_ASYNCFULL (1U << 1)
55 struct request_queue
*q
; /* the queue this rl belongs to */
56 #ifdef CONFIG_BLK_CGROUP
57 struct blkcg_gq
*blkg
; /* blkg this request pool belongs to */
60 * count[], starved[], and wait[] are indexed by
61 * BLK_RW_SYNC/BLK_RW_ASYNC
66 wait_queue_head_t wait
[2];
71 * request command types
73 enum rq_cmd_type_bits
{
74 REQ_TYPE_FS
= 1, /* fs request */
75 REQ_TYPE_BLOCK_PC
, /* scsi command */
76 REQ_TYPE_SENSE
, /* sense request */
77 REQ_TYPE_PM_SUSPEND
, /* suspend request */
78 REQ_TYPE_PM_RESUME
, /* resume request */
79 REQ_TYPE_PM_SHUTDOWN
, /* shutdown request */
80 REQ_TYPE_SPECIAL
, /* driver defined type */
82 * for ATA/ATAPI devices. this really doesn't belong here, ide should
83 * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver
84 * private REQ_LB opcodes to differentiate what type of request this is
86 REQ_TYPE_ATA_TASKFILE
,
90 #define BLK_MAX_CDB 16
93 * Try to put the fields that are referenced together in the same cacheline.
95 * If you modify this structure, make sure to update blk_rq_init() and
96 * especially blk_mq_rq_ctx_init() to take care of the added fields.
99 struct list_head queuelist
;
101 struct call_single_data csd
;
102 unsigned long fifo_time
;
105 struct request_queue
*q
;
106 struct blk_mq_ctx
*mq_ctx
;
109 enum rq_cmd_type_bits cmd_type
;
110 unsigned long atomic_flags
;
114 /* the following two fields are internal, NEVER access directly */
115 unsigned int __data_len
; /* total data len */
116 sector_t __sector
; /* sector cursor */
122 * The hash is used inside the scheduler, and killed once the
123 * request reaches the dispatch list. The ipi_list is only used
124 * to queue the request for softirq completion, which is long
125 * after the request has been unhashed (and even removed from
126 * the dispatch list).
129 struct hlist_node hash
; /* merge hash */
130 struct list_head ipi_list
;
134 * The rb_node is only used inside the io scheduler, requests
135 * are pruned when moved to the dispatch queue. So let the
136 * completion_data share space with the rb_node.
139 struct rb_node rb_node
; /* sort/lookup */
140 void *completion_data
;
144 * Three pointers are available for the IO schedulers, if they need
145 * more they have to dynamically allocate it. Flush requests are
146 * never put on the IO scheduler. So let the flush fields share
147 * space with the elevator data.
157 struct list_head list
;
158 rq_end_io_fn
*saved_end_io
;
162 struct gendisk
*rq_disk
;
163 struct hd_struct
*part
;
164 unsigned long start_time
;
165 #ifdef CONFIG_BLK_CGROUP
166 struct request_list
*rl
; /* rl this rq is alloced from */
167 unsigned long long start_time_ns
;
168 unsigned long long io_start_time_ns
; /* when passed to hardware */
170 /* Number of scatter-gather DMA addr+len pairs after
171 * physical address coalescing is performed.
173 unsigned short nr_phys_segments
;
174 #if defined(CONFIG_BLK_DEV_INTEGRITY)
175 unsigned short nr_integrity_segments
;
178 unsigned short ioprio
;
180 void *special
; /* opaque pointer available for LLD use */
186 * when request is used as a packet command carrier
188 unsigned char __cmd
[BLK_MAX_CDB
];
190 unsigned short cmd_len
;
192 unsigned int extra_len
; /* length of alignment and padding */
193 unsigned int sense_len
;
194 unsigned int resid_len
; /* residual count */
197 unsigned long deadline
;
198 struct list_head timeout_list
;
199 unsigned int timeout
;
203 * completion callback.
205 rq_end_io_fn
*end_io
;
209 struct request
*next_rq
;
212 static inline unsigned short req_get_ioprio(struct request
*req
)
218 * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME
219 * requests. Some step values could eventually be made generic.
221 struct request_pm_state
223 /* PM state machine step value, currently driver specific */
225 /* requested PM state value (S1, S2, S3, S4, ...) */
227 void* data
; /* for driver use */
230 #include <linux/elevator.h>
232 struct blk_queue_ctx
;
234 typedef void (request_fn_proc
) (struct request_queue
*q
);
235 typedef void (make_request_fn
) (struct request_queue
*q
, struct bio
*bio
);
236 typedef int (prep_rq_fn
) (struct request_queue
*, struct request
*);
237 typedef void (unprep_rq_fn
) (struct request_queue
*, struct request
*);
240 struct bvec_merge_data
{
241 struct block_device
*bi_bdev
;
246 typedef int (merge_bvec_fn
) (struct request_queue
*, struct bvec_merge_data
*,
248 typedef void (softirq_done_fn
)(struct request
*);
249 typedef int (dma_drain_needed_fn
)(struct request
*);
250 typedef int (lld_busy_fn
) (struct request_queue
*q
);
251 typedef int (bsg_job_fn
) (struct bsg_job
*);
253 enum blk_eh_timer_return
{
259 typedef enum blk_eh_timer_return (rq_timed_out_fn
)(struct request
*);
261 enum blk_queue_state
{
266 struct blk_queue_tag
{
267 struct request
**tag_index
; /* map of busy tags */
268 unsigned long *tag_map
; /* bit map of free/busy tags */
269 int busy
; /* current depth */
270 int max_depth
; /* what we will send to device */
271 int real_max_depth
; /* what the array can hold */
272 atomic_t refcnt
; /* map can be shared */
275 #define BLK_SCSI_MAX_CMDS (256)
276 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
278 struct queue_limits
{
279 unsigned long bounce_pfn
;
280 unsigned long seg_boundary_mask
;
282 unsigned int max_hw_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
*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
;
398 #ifdef CONFIG_PM_RUNTIME
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 unsigned int flush_queue_delayed
:1;
457 unsigned int flush_pending_idx
:1;
458 unsigned int flush_running_idx
:1;
459 unsigned long flush_pending_since
;
460 struct list_head flush_queue
[2];
461 struct list_head flush_data_in_flight
;
462 struct request
*flush_rq
;
463 spinlock_t mq_flush_lock
;
465 struct list_head requeue_list
;
466 spinlock_t requeue_lock
;
467 struct work_struct requeue_work
;
469 struct mutex sysfs_lock
;
473 #if defined(CONFIG_BLK_DEV_BSG)
474 bsg_job_fn
*bsg_job_fn
;
476 struct bsg_class_device bsg_dev
;
479 #ifdef CONFIG_BLK_DEV_THROTTLING
481 struct throtl_data
*td
;
483 struct rcu_head rcu_head
;
484 wait_queue_head_t mq_freeze_wq
;
485 struct percpu_counter mq_usage_counter
;
486 struct list_head all_q_node
;
488 struct blk_mq_tag_set
*tag_set
;
489 struct list_head tag_set_list
;
492 #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */
493 #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */
494 #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */
495 #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */
496 #define QUEUE_FLAG_DYING 5 /* queue being torn down */
497 #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */
498 #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */
499 #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */
500 #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */
501 #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */
502 #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */
503 #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */
504 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
505 #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */
506 #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */
507 #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */
508 #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */
509 #define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */
510 #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */
511 #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */
512 #define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */
514 #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
515 (1 << QUEUE_FLAG_STACKABLE) | \
516 (1 << QUEUE_FLAG_SAME_COMP) | \
517 (1 << QUEUE_FLAG_ADD_RANDOM))
519 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
520 (1 << QUEUE_FLAG_SAME_COMP))
522 static inline void queue_lockdep_assert_held(struct request_queue
*q
)
525 lockdep_assert_held(q
->queue_lock
);
528 static inline void queue_flag_set_unlocked(unsigned int flag
,
529 struct request_queue
*q
)
531 __set_bit(flag
, &q
->queue_flags
);
534 static inline int queue_flag_test_and_clear(unsigned int flag
,
535 struct request_queue
*q
)
537 queue_lockdep_assert_held(q
);
539 if (test_bit(flag
, &q
->queue_flags
)) {
540 __clear_bit(flag
, &q
->queue_flags
);
547 static inline int queue_flag_test_and_set(unsigned int flag
,
548 struct request_queue
*q
)
550 queue_lockdep_assert_held(q
);
552 if (!test_bit(flag
, &q
->queue_flags
)) {
553 __set_bit(flag
, &q
->queue_flags
);
560 static inline void queue_flag_set(unsigned int flag
, struct request_queue
*q
)
562 queue_lockdep_assert_held(q
);
563 __set_bit(flag
, &q
->queue_flags
);
566 static inline void queue_flag_clear_unlocked(unsigned int flag
,
567 struct request_queue
*q
)
569 __clear_bit(flag
, &q
->queue_flags
);
572 static inline int queue_in_flight(struct request_queue
*q
)
574 return q
->in_flight
[0] + q
->in_flight
[1];
577 static inline void queue_flag_clear(unsigned int flag
, struct request_queue
*q
)
579 queue_lockdep_assert_held(q
);
580 __clear_bit(flag
, &q
->queue_flags
);
583 #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
584 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
585 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
586 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
587 #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags)
588 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
589 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
590 #define blk_queue_noxmerges(q) \
591 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
592 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
593 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
594 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
595 #define blk_queue_stackable(q) \
596 test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
597 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
598 #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \
599 test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags))
601 #define blk_noretry_request(rq) \
602 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
603 REQ_FAILFAST_DRIVER))
605 #define blk_account_rq(rq) \
606 (((rq)->cmd_flags & REQ_STARTED) && \
607 ((rq)->cmd_type == REQ_TYPE_FS))
609 #define blk_pm_request(rq) \
610 ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \
611 (rq)->cmd_type == REQ_TYPE_PM_RESUME)
613 #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
614 #define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
615 /* rq->queuelist of dequeued request must be list_empty() */
616 #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
618 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
620 #define rq_data_dir(rq) (((rq)->cmd_flags & 1) != 0)
622 static inline unsigned int blk_queue_cluster(struct request_queue
*q
)
624 return q
->limits
.cluster
;
628 * We regard a request as sync, if either a read or a sync write
630 static inline bool rw_is_sync(unsigned int rw_flags
)
632 return !(rw_flags
& REQ_WRITE
) || (rw_flags
& REQ_SYNC
);
635 static inline bool rq_is_sync(struct request
*rq
)
637 return rw_is_sync(rq
->cmd_flags
);
640 static inline bool blk_rl_full(struct request_list
*rl
, bool sync
)
642 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
644 return rl
->flags
& flag
;
647 static inline void blk_set_rl_full(struct request_list
*rl
, bool sync
)
649 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
654 static inline void blk_clear_rl_full(struct request_list
*rl
, bool sync
)
656 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
661 static inline bool rq_mergeable(struct request
*rq
)
663 if (rq
->cmd_type
!= REQ_TYPE_FS
)
666 if (rq
->cmd_flags
& REQ_NOMERGE_FLAGS
)
672 static inline bool blk_check_merge_flags(unsigned int flags1
,
675 if ((flags1
& REQ_DISCARD
) != (flags2
& REQ_DISCARD
))
678 if ((flags1
& REQ_SECURE
) != (flags2
& REQ_SECURE
))
681 if ((flags1
& REQ_WRITE_SAME
) != (flags2
& REQ_WRITE_SAME
))
687 static inline bool blk_write_same_mergeable(struct bio
*a
, struct bio
*b
)
689 if (bio_data(a
) == bio_data(b
))
696 * q->prep_rq_fn return values
698 #define BLKPREP_OK 0 /* serve it */
699 #define BLKPREP_KILL 1 /* fatal error, kill */
700 #define BLKPREP_DEFER 2 /* leave on queue */
702 extern unsigned long blk_max_low_pfn
, blk_max_pfn
;
705 * standard bounce addresses:
707 * BLK_BOUNCE_HIGH : bounce all highmem pages
708 * BLK_BOUNCE_ANY : don't bounce anything
709 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
712 #if BITS_PER_LONG == 32
713 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
715 #define BLK_BOUNCE_HIGH -1ULL
717 #define BLK_BOUNCE_ANY (-1ULL)
718 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
721 * default timeout for SG_IO if none specified
723 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
724 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
727 extern int init_emergency_isa_pool(void);
728 extern void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
);
730 static inline int init_emergency_isa_pool(void)
734 static inline void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
)
737 #endif /* CONFIG_MMU */
743 unsigned long offset
;
748 struct req_iterator
{
749 struct bvec_iter iter
;
753 /* This should not be used directly - use rq_for_each_segment */
754 #define for_each_bio(_bio) \
755 for (; _bio; _bio = _bio->bi_next)
756 #define __rq_for_each_bio(_bio, rq) \
758 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
760 #define rq_for_each_segment(bvl, _rq, _iter) \
761 __rq_for_each_bio(_iter.bio, _rq) \
762 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
764 #define rq_iter_last(bvec, _iter) \
765 (_iter.bio->bi_next == NULL && \
766 bio_iter_last(bvec, _iter.iter))
768 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
769 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
771 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
772 extern void rq_flush_dcache_pages(struct request
*rq
);
774 static inline void rq_flush_dcache_pages(struct request
*rq
)
779 extern int blk_register_queue(struct gendisk
*disk
);
780 extern void blk_unregister_queue(struct gendisk
*disk
);
781 extern void generic_make_request(struct bio
*bio
);
782 extern void blk_rq_init(struct request_queue
*q
, struct request
*rq
);
783 extern void blk_put_request(struct request
*);
784 extern void __blk_put_request(struct request_queue
*, struct request
*);
785 extern struct request
*blk_get_request(struct request_queue
*, int, gfp_t
);
786 extern struct request
*blk_make_request(struct request_queue
*, struct bio
*,
788 extern void blk_requeue_request(struct request_queue
*, struct request
*);
789 extern void blk_add_request_payload(struct request
*rq
, struct page
*page
,
791 extern int blk_rq_check_limits(struct request_queue
*q
, struct request
*rq
);
792 extern int blk_lld_busy(struct request_queue
*q
);
793 extern int blk_rq_prep_clone(struct request
*rq
, struct request
*rq_src
,
794 struct bio_set
*bs
, gfp_t gfp_mask
,
795 int (*bio_ctr
)(struct bio
*, struct bio
*, void *),
797 extern void blk_rq_unprep_clone(struct request
*rq
);
798 extern int blk_insert_cloned_request(struct request_queue
*q
,
800 extern void blk_delay_queue(struct request_queue
*, unsigned long);
801 extern void blk_recount_segments(struct request_queue
*, struct bio
*);
802 extern int scsi_verify_blk_ioctl(struct block_device
*, unsigned int);
803 extern int scsi_cmd_blk_ioctl(struct block_device
*, fmode_t
,
804 unsigned int, void __user
*);
805 extern int scsi_cmd_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
806 unsigned int, void __user
*);
807 extern int sg_scsi_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
808 struct scsi_ioctl_command __user
*);
810 extern void blk_queue_bio(struct request_queue
*q
, struct bio
*bio
);
813 * A queue has just exitted congestion. Note this in the global counter of
814 * congested queues, and wake up anyone who was waiting for requests to be
817 static inline void blk_clear_queue_congested(struct request_queue
*q
, int sync
)
819 clear_bdi_congested(&q
->backing_dev_info
, sync
);
823 * A queue has just entered congestion. Flag that in the queue's VM-visible
824 * state flags and increment the global gounter of congested queues.
826 static inline void blk_set_queue_congested(struct request_queue
*q
, int sync
)
828 set_bdi_congested(&q
->backing_dev_info
, sync
);
831 extern void blk_start_queue(struct request_queue
*q
);
832 extern void blk_stop_queue(struct request_queue
*q
);
833 extern void blk_sync_queue(struct request_queue
*q
);
834 extern void __blk_stop_queue(struct request_queue
*q
);
835 extern void __blk_run_queue(struct request_queue
*q
);
836 extern void blk_run_queue(struct request_queue
*);
837 extern void blk_run_queue_async(struct request_queue
*q
);
838 extern int blk_rq_map_user(struct request_queue
*, struct request
*,
839 struct rq_map_data
*, void __user
*, unsigned long,
841 extern int blk_rq_unmap_user(struct bio
*);
842 extern int blk_rq_map_kern(struct request_queue
*, struct request
*, void *, unsigned int, gfp_t
);
843 extern int blk_rq_map_user_iov(struct request_queue
*, struct request
*,
844 struct rq_map_data
*, const struct sg_iovec
*,
845 int, unsigned int, gfp_t
);
846 extern int blk_execute_rq(struct request_queue
*, struct gendisk
*,
847 struct request
*, int);
848 extern void blk_execute_rq_nowait(struct request_queue
*, struct gendisk
*,
849 struct request
*, int, rq_end_io_fn
*);
851 static inline struct request_queue
*bdev_get_queue(struct block_device
*bdev
)
853 return bdev
->bd_disk
->queue
;
857 * blk_rq_pos() : the current sector
858 * blk_rq_bytes() : bytes left in the entire request
859 * blk_rq_cur_bytes() : bytes left in the current segment
860 * blk_rq_err_bytes() : bytes left till the next error boundary
861 * blk_rq_sectors() : sectors left in the entire request
862 * blk_rq_cur_sectors() : sectors left in the current segment
864 static inline sector_t
blk_rq_pos(const struct request
*rq
)
869 static inline unsigned int blk_rq_bytes(const struct request
*rq
)
871 return rq
->__data_len
;
874 static inline int blk_rq_cur_bytes(const struct request
*rq
)
876 return rq
->bio
? bio_cur_bytes(rq
->bio
) : 0;
879 extern unsigned int blk_rq_err_bytes(const struct request
*rq
);
881 static inline unsigned int blk_rq_sectors(const struct request
*rq
)
883 return blk_rq_bytes(rq
) >> 9;
886 static inline unsigned int blk_rq_cur_sectors(const struct request
*rq
)
888 return blk_rq_cur_bytes(rq
) >> 9;
891 static inline unsigned int blk_queue_get_max_sectors(struct request_queue
*q
,
892 unsigned int cmd_flags
)
894 if (unlikely(cmd_flags
& REQ_DISCARD
))
895 return min(q
->limits
.max_discard_sectors
, UINT_MAX
>> 9);
897 if (unlikely(cmd_flags
& REQ_WRITE_SAME
))
898 return q
->limits
.max_write_same_sectors
;
900 return q
->limits
.max_sectors
;
903 static inline unsigned int blk_rq_get_max_sectors(struct request
*rq
)
905 struct request_queue
*q
= rq
->q
;
907 if (unlikely(rq
->cmd_type
== REQ_TYPE_BLOCK_PC
))
908 return q
->limits
.max_hw_sectors
;
910 return blk_queue_get_max_sectors(q
, rq
->cmd_flags
);
913 static inline unsigned int blk_rq_count_bios(struct request
*rq
)
915 unsigned int nr_bios
= 0;
918 __rq_for_each_bio(bio
, rq
)
925 * Request issue related functions.
927 extern struct request
*blk_peek_request(struct request_queue
*q
);
928 extern void blk_start_request(struct request
*rq
);
929 extern struct request
*blk_fetch_request(struct request_queue
*q
);
932 * Request completion related functions.
934 * blk_update_request() completes given number of bytes and updates
935 * the request without completing it.
937 * blk_end_request() and friends. __blk_end_request() must be called
938 * with the request queue spinlock acquired.
940 * Several drivers define their own end_request and call
941 * blk_end_request() for parts of the original function.
942 * This prevents code duplication in drivers.
944 extern bool blk_update_request(struct request
*rq
, int error
,
945 unsigned int nr_bytes
);
946 extern void blk_finish_request(struct request
*rq
, int error
);
947 extern bool blk_end_request(struct request
*rq
, int error
,
948 unsigned int nr_bytes
);
949 extern void blk_end_request_all(struct request
*rq
, int error
);
950 extern bool blk_end_request_cur(struct request
*rq
, int error
);
951 extern bool blk_end_request_err(struct request
*rq
, int error
);
952 extern bool __blk_end_request(struct request
*rq
, int error
,
953 unsigned int nr_bytes
);
954 extern void __blk_end_request_all(struct request
*rq
, int error
);
955 extern bool __blk_end_request_cur(struct request
*rq
, int error
);
956 extern bool __blk_end_request_err(struct request
*rq
, int error
);
958 extern void blk_complete_request(struct request
*);
959 extern void __blk_complete_request(struct request
*);
960 extern void blk_abort_request(struct request
*);
961 extern void blk_unprep_request(struct request
*);
964 * Access functions for manipulating queue properties
966 extern struct request_queue
*blk_init_queue_node(request_fn_proc
*rfn
,
967 spinlock_t
*lock
, int node_id
);
968 extern struct request_queue
*blk_init_queue(request_fn_proc
*, spinlock_t
*);
969 extern struct request_queue
*blk_init_allocated_queue(struct request_queue
*,
970 request_fn_proc
*, spinlock_t
*);
971 extern void blk_cleanup_queue(struct request_queue
*);
972 extern void blk_queue_make_request(struct request_queue
*, make_request_fn
*);
973 extern void blk_queue_bounce_limit(struct request_queue
*, u64
);
974 extern void blk_limits_max_hw_sectors(struct queue_limits
*, unsigned int);
975 extern void blk_queue_max_hw_sectors(struct request_queue
*, unsigned int);
976 extern void blk_queue_max_segments(struct request_queue
*, unsigned short);
977 extern void blk_queue_max_segment_size(struct request_queue
*, unsigned int);
978 extern void blk_queue_max_discard_sectors(struct request_queue
*q
,
979 unsigned int max_discard_sectors
);
980 extern void blk_queue_max_write_same_sectors(struct request_queue
*q
,
981 unsigned int max_write_same_sectors
);
982 extern void blk_queue_logical_block_size(struct request_queue
*, unsigned short);
983 extern void blk_queue_physical_block_size(struct request_queue
*, unsigned int);
984 extern void blk_queue_alignment_offset(struct request_queue
*q
,
985 unsigned int alignment
);
986 extern void blk_limits_io_min(struct queue_limits
*limits
, unsigned int min
);
987 extern void blk_queue_io_min(struct request_queue
*q
, unsigned int min
);
988 extern void blk_limits_io_opt(struct queue_limits
*limits
, unsigned int opt
);
989 extern void blk_queue_io_opt(struct request_queue
*q
, unsigned int opt
);
990 extern void blk_set_default_limits(struct queue_limits
*lim
);
991 extern void blk_set_stacking_limits(struct queue_limits
*lim
);
992 extern int blk_stack_limits(struct queue_limits
*t
, struct queue_limits
*b
,
994 extern int bdev_stack_limits(struct queue_limits
*t
, struct block_device
*bdev
,
996 extern void disk_stack_limits(struct gendisk
*disk
, struct block_device
*bdev
,
998 extern void blk_queue_stack_limits(struct request_queue
*t
, struct request_queue
*b
);
999 extern void blk_queue_dma_pad(struct request_queue
*, unsigned int);
1000 extern void blk_queue_update_dma_pad(struct request_queue
*, unsigned int);
1001 extern int blk_queue_dma_drain(struct request_queue
*q
,
1002 dma_drain_needed_fn
*dma_drain_needed
,
1003 void *buf
, unsigned int size
);
1004 extern void blk_queue_lld_busy(struct request_queue
*q
, lld_busy_fn
*fn
);
1005 extern void blk_queue_segment_boundary(struct request_queue
*, unsigned long);
1006 extern void blk_queue_prep_rq(struct request_queue
*, prep_rq_fn
*pfn
);
1007 extern void blk_queue_unprep_rq(struct request_queue
*, unprep_rq_fn
*ufn
);
1008 extern void blk_queue_merge_bvec(struct request_queue
*, merge_bvec_fn
*);
1009 extern void blk_queue_dma_alignment(struct request_queue
*, int);
1010 extern void blk_queue_update_dma_alignment(struct request_queue
*, int);
1011 extern void blk_queue_softirq_done(struct request_queue
*, softirq_done_fn
*);
1012 extern void blk_queue_rq_timed_out(struct request_queue
*, rq_timed_out_fn
*);
1013 extern void blk_queue_rq_timeout(struct request_queue
*, unsigned int);
1014 extern void blk_queue_flush(struct request_queue
*q
, unsigned int flush
);
1015 extern void blk_queue_flush_queueable(struct request_queue
*q
, bool queueable
);
1016 extern struct backing_dev_info
*blk_get_backing_dev_info(struct block_device
*bdev
);
1018 extern int blk_rq_map_sg(struct request_queue
*, struct request
*, struct scatterlist
*);
1019 extern int blk_bio_map_sg(struct request_queue
*q
, struct bio
*bio
,
1020 struct scatterlist
*sglist
);
1021 extern void blk_dump_rq_flags(struct request
*, char *);
1022 extern long nr_blockdev_pages(void);
1024 bool __must_check
blk_get_queue(struct request_queue
*);
1025 struct request_queue
*blk_alloc_queue(gfp_t
);
1026 struct request_queue
*blk_alloc_queue_node(gfp_t
, int);
1027 extern void blk_put_queue(struct request_queue
*);
1030 * block layer runtime pm functions
1032 #ifdef CONFIG_PM_RUNTIME
1033 extern void blk_pm_runtime_init(struct request_queue
*q
, struct device
*dev
);
1034 extern int blk_pre_runtime_suspend(struct request_queue
*q
);
1035 extern void blk_post_runtime_suspend(struct request_queue
*q
, int err
);
1036 extern void blk_pre_runtime_resume(struct request_queue
*q
);
1037 extern void blk_post_runtime_resume(struct request_queue
*q
, int err
);
1039 static inline void blk_pm_runtime_init(struct request_queue
*q
,
1040 struct device
*dev
) {}
1041 static inline int blk_pre_runtime_suspend(struct request_queue
*q
)
1045 static inline void blk_post_runtime_suspend(struct request_queue
*q
, int err
) {}
1046 static inline void blk_pre_runtime_resume(struct request_queue
*q
) {}
1047 static inline void blk_post_runtime_resume(struct request_queue
*q
, int err
) {}
1051 * blk_plug permits building a queue of related requests by holding the I/O
1052 * fragments for a short period. This allows merging of sequential requests
1053 * into single larger request. As the requests are moved from a per-task list to
1054 * the device's request_queue in a batch, this results in improved scalability
1055 * as the lock contention for request_queue lock is reduced.
1057 * It is ok not to disable preemption when adding the request to the plug list
1058 * or when attempting a merge, because blk_schedule_flush_list() will only flush
1059 * the plug list when the task sleeps by itself. For details, please see
1060 * schedule() where blk_schedule_flush_plug() is called.
1063 unsigned long magic
; /* detect uninitialized use-cases */
1064 struct list_head list
; /* requests */
1065 struct list_head mq_list
; /* blk-mq requests */
1066 struct list_head cb_list
; /* md requires an unplug callback */
1068 #define BLK_MAX_REQUEST_COUNT 16
1071 typedef void (*blk_plug_cb_fn
)(struct blk_plug_cb
*, bool);
1072 struct blk_plug_cb
{
1073 struct list_head list
;
1074 blk_plug_cb_fn callback
;
1077 extern struct blk_plug_cb
*blk_check_plugged(blk_plug_cb_fn unplug
,
1078 void *data
, int size
);
1079 extern void blk_start_plug(struct blk_plug
*);
1080 extern void blk_finish_plug(struct blk_plug
*);
1081 extern void blk_flush_plug_list(struct blk_plug
*, bool);
1083 static inline void blk_flush_plug(struct task_struct
*tsk
)
1085 struct blk_plug
*plug
= tsk
->plug
;
1088 blk_flush_plug_list(plug
, false);
1091 static inline void blk_schedule_flush_plug(struct task_struct
*tsk
)
1093 struct blk_plug
*plug
= tsk
->plug
;
1096 blk_flush_plug_list(plug
, true);
1099 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1101 struct blk_plug
*plug
= tsk
->plug
;
1104 (!list_empty(&plug
->list
) ||
1105 !list_empty(&plug
->mq_list
) ||
1106 !list_empty(&plug
->cb_list
));
1112 #define blk_rq_tagged(rq) \
1113 ((rq)->mq_ctx || ((rq)->cmd_flags & REQ_QUEUED))
1114 extern int blk_queue_start_tag(struct request_queue
*, struct request
*);
1115 extern struct request
*blk_queue_find_tag(struct request_queue
*, int);
1116 extern void blk_queue_end_tag(struct request_queue
*, struct request
*);
1117 extern int blk_queue_init_tags(struct request_queue
*, int, struct blk_queue_tag
*);
1118 extern void blk_queue_free_tags(struct request_queue
*);
1119 extern int blk_queue_resize_tags(struct request_queue
*, int);
1120 extern void blk_queue_invalidate_tags(struct request_queue
*);
1121 extern struct blk_queue_tag
*blk_init_tags(int);
1122 extern void blk_free_tags(struct blk_queue_tag
*);
1124 static inline struct request
*blk_map_queue_find_tag(struct blk_queue_tag
*bqt
,
1127 if (unlikely(bqt
== NULL
|| tag
>= bqt
->real_max_depth
))
1129 return bqt
->tag_index
[tag
];
1132 #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */
1134 extern int blkdev_issue_flush(struct block_device
*, gfp_t
, sector_t
*);
1135 extern int blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1136 sector_t nr_sects
, gfp_t gfp_mask
, unsigned long flags
);
1137 extern int blkdev_issue_write_same(struct block_device
*bdev
, sector_t sector
,
1138 sector_t nr_sects
, gfp_t gfp_mask
, struct page
*page
);
1139 extern int blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1140 sector_t nr_sects
, gfp_t gfp_mask
);
1141 static inline int sb_issue_discard(struct super_block
*sb
, sector_t block
,
1142 sector_t nr_blocks
, gfp_t gfp_mask
, unsigned long flags
)
1144 return blkdev_issue_discard(sb
->s_bdev
, block
<< (sb
->s_blocksize_bits
- 9),
1145 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1148 static inline int sb_issue_zeroout(struct super_block
*sb
, sector_t block
,
1149 sector_t nr_blocks
, gfp_t gfp_mask
)
1151 return blkdev_issue_zeroout(sb
->s_bdev
,
1152 block
<< (sb
->s_blocksize_bits
- 9),
1153 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1157 extern int blk_verify_command(unsigned char *cmd
, fmode_t has_write_perm
);
1159 enum blk_default_limits
{
1160 BLK_MAX_SEGMENTS
= 128,
1161 BLK_SAFE_MAX_SECTORS
= 255,
1162 BLK_DEF_MAX_SECTORS
= 1024,
1163 BLK_MAX_SEGMENT_SIZE
= 65536,
1164 BLK_SEG_BOUNDARY_MASK
= 0xFFFFFFFFUL
,
1167 #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
1169 static inline unsigned long queue_bounce_pfn(struct request_queue
*q
)
1171 return q
->limits
.bounce_pfn
;
1174 static inline unsigned long queue_segment_boundary(struct request_queue
*q
)
1176 return q
->limits
.seg_boundary_mask
;
1179 static inline unsigned int queue_max_sectors(struct request_queue
*q
)
1181 return q
->limits
.max_sectors
;
1184 static inline unsigned int queue_max_hw_sectors(struct request_queue
*q
)
1186 return q
->limits
.max_hw_sectors
;
1189 static inline unsigned short queue_max_segments(struct request_queue
*q
)
1191 return q
->limits
.max_segments
;
1194 static inline unsigned int queue_max_segment_size(struct request_queue
*q
)
1196 return q
->limits
.max_segment_size
;
1199 static inline unsigned short queue_logical_block_size(struct request_queue
*q
)
1203 if (q
&& q
->limits
.logical_block_size
)
1204 retval
= q
->limits
.logical_block_size
;
1209 static inline unsigned short bdev_logical_block_size(struct block_device
*bdev
)
1211 return queue_logical_block_size(bdev_get_queue(bdev
));
1214 static inline unsigned int queue_physical_block_size(struct request_queue
*q
)
1216 return q
->limits
.physical_block_size
;
1219 static inline unsigned int bdev_physical_block_size(struct block_device
*bdev
)
1221 return queue_physical_block_size(bdev_get_queue(bdev
));
1224 static inline unsigned int queue_io_min(struct request_queue
*q
)
1226 return q
->limits
.io_min
;
1229 static inline int bdev_io_min(struct block_device
*bdev
)
1231 return queue_io_min(bdev_get_queue(bdev
));
1234 static inline unsigned int queue_io_opt(struct request_queue
*q
)
1236 return q
->limits
.io_opt
;
1239 static inline int bdev_io_opt(struct block_device
*bdev
)
1241 return queue_io_opt(bdev_get_queue(bdev
));
1244 static inline int queue_alignment_offset(struct request_queue
*q
)
1246 if (q
->limits
.misaligned
)
1249 return q
->limits
.alignment_offset
;
1252 static inline int queue_limit_alignment_offset(struct queue_limits
*lim
, sector_t sector
)
1254 unsigned int granularity
= max(lim
->physical_block_size
, lim
->io_min
);
1255 unsigned int alignment
= (sector
<< 9) & (granularity
- 1);
1257 return (granularity
+ lim
->alignment_offset
- alignment
)
1258 & (granularity
- 1);
1261 static inline int bdev_alignment_offset(struct block_device
*bdev
)
1263 struct request_queue
*q
= bdev_get_queue(bdev
);
1265 if (q
->limits
.misaligned
)
1268 if (bdev
!= bdev
->bd_contains
)
1269 return bdev
->bd_part
->alignment_offset
;
1271 return q
->limits
.alignment_offset
;
1274 static inline int queue_discard_alignment(struct request_queue
*q
)
1276 if (q
->limits
.discard_misaligned
)
1279 return q
->limits
.discard_alignment
;
1282 static inline int queue_limit_discard_alignment(struct queue_limits
*lim
, sector_t sector
)
1284 unsigned int alignment
, granularity
, offset
;
1286 if (!lim
->max_discard_sectors
)
1289 /* Why are these in bytes, not sectors? */
1290 alignment
= lim
->discard_alignment
>> 9;
1291 granularity
= lim
->discard_granularity
>> 9;
1295 /* Offset of the partition start in 'granularity' sectors */
1296 offset
= sector_div(sector
, granularity
);
1298 /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1299 offset
= (granularity
+ alignment
- offset
) % granularity
;
1301 /* Turn it back into bytes, gaah */
1305 static inline int bdev_discard_alignment(struct block_device
*bdev
)
1307 struct request_queue
*q
= bdev_get_queue(bdev
);
1309 if (bdev
!= bdev
->bd_contains
)
1310 return bdev
->bd_part
->discard_alignment
;
1312 return q
->limits
.discard_alignment
;
1315 static inline unsigned int queue_discard_zeroes_data(struct request_queue
*q
)
1317 if (q
->limits
.max_discard_sectors
&& q
->limits
.discard_zeroes_data
== 1)
1323 static inline unsigned int bdev_discard_zeroes_data(struct block_device
*bdev
)
1325 return queue_discard_zeroes_data(bdev_get_queue(bdev
));
1328 static inline unsigned int bdev_write_same(struct block_device
*bdev
)
1330 struct request_queue
*q
= bdev_get_queue(bdev
);
1333 return q
->limits
.max_write_same_sectors
;
1338 static inline int queue_dma_alignment(struct request_queue
*q
)
1340 return q
? q
->dma_alignment
: 511;
1343 static inline int blk_rq_aligned(struct request_queue
*q
, unsigned long addr
,
1346 unsigned int alignment
= queue_dma_alignment(q
) | q
->dma_pad_mask
;
1347 return !(addr
& alignment
) && !(len
& alignment
);
1350 /* assumes size > 256 */
1351 static inline unsigned int blksize_bits(unsigned int size
)
1353 unsigned int bits
= 8;
1357 } while (size
> 256);
1361 static inline unsigned int block_size(struct block_device
*bdev
)
1363 return bdev
->bd_block_size
;
1366 static inline bool queue_flush_queueable(struct request_queue
*q
)
1368 return !q
->flush_not_queueable
;
1371 typedef struct {struct page
*v
;} Sector
;
1373 unsigned char *read_dev_sector(struct block_device
*, sector_t
, Sector
*);
1375 static inline void put_dev_sector(Sector p
)
1377 page_cache_release(p
.v
);
1381 int kblockd_schedule_work(struct work_struct
*work
);
1382 int kblockd_schedule_delayed_work(struct delayed_work
*dwork
, unsigned long delay
);
1383 int kblockd_schedule_delayed_work_on(int cpu
, struct delayed_work
*dwork
, unsigned long delay
);
1385 #ifdef CONFIG_BLK_CGROUP
1387 * This should not be using sched_clock(). A real patch is in progress
1388 * to fix this up, until that is in place we need to disable preemption
1389 * around sched_clock() in this function and set_io_start_time_ns().
1391 static inline void set_start_time_ns(struct request
*req
)
1394 req
->start_time_ns
= sched_clock();
1398 static inline void set_io_start_time_ns(struct request
*req
)
1401 req
->io_start_time_ns
= sched_clock();
1405 static inline uint64_t rq_start_time_ns(struct request
*req
)
1407 return req
->start_time_ns
;
1410 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1412 return req
->io_start_time_ns
;
1415 static inline void set_start_time_ns(struct request
*req
) {}
1416 static inline void set_io_start_time_ns(struct request
*req
) {}
1417 static inline uint64_t rq_start_time_ns(struct request
*req
)
1421 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1427 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1428 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1429 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1430 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1432 #if defined(CONFIG_BLK_DEV_INTEGRITY)
1434 #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */
1435 #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */
1437 struct blk_integrity_exchg
{
1441 unsigned int data_size
;
1442 unsigned short sector_size
;
1443 const char *disk_name
;
1446 typedef void (integrity_gen_fn
) (struct blk_integrity_exchg
*);
1447 typedef int (integrity_vrfy_fn
) (struct blk_integrity_exchg
*);
1448 typedef void (integrity_set_tag_fn
) (void *, void *, unsigned int);
1449 typedef void (integrity_get_tag_fn
) (void *, void *, unsigned int);
1451 struct blk_integrity
{
1452 integrity_gen_fn
*generate_fn
;
1453 integrity_vrfy_fn
*verify_fn
;
1454 integrity_set_tag_fn
*set_tag_fn
;
1455 integrity_get_tag_fn
*get_tag_fn
;
1457 unsigned short flags
;
1458 unsigned short tuple_size
;
1459 unsigned short sector_size
;
1460 unsigned short tag_size
;
1464 struct kobject kobj
;
1467 extern bool blk_integrity_is_initialized(struct gendisk
*);
1468 extern int blk_integrity_register(struct gendisk
*, struct blk_integrity
*);
1469 extern void blk_integrity_unregister(struct gendisk
*);
1470 extern int blk_integrity_compare(struct gendisk
*, struct gendisk
*);
1471 extern int blk_rq_map_integrity_sg(struct request_queue
*, struct bio
*,
1472 struct scatterlist
*);
1473 extern int blk_rq_count_integrity_sg(struct request_queue
*, struct bio
*);
1474 extern int blk_integrity_merge_rq(struct request_queue
*, struct request
*,
1476 extern int blk_integrity_merge_bio(struct request_queue
*, struct request
*,
1480 struct blk_integrity
*bdev_get_integrity(struct block_device
*bdev
)
1482 return bdev
->bd_disk
->integrity
;
1485 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1487 return disk
->integrity
;
1490 static inline int blk_integrity_rq(struct request
*rq
)
1492 if (rq
->bio
== NULL
)
1495 return bio_integrity(rq
->bio
);
1498 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1501 q
->limits
.max_integrity_segments
= segs
;
1504 static inline unsigned short
1505 queue_max_integrity_segments(struct request_queue
*q
)
1507 return q
->limits
.max_integrity_segments
;
1510 #else /* CONFIG_BLK_DEV_INTEGRITY */
1513 struct block_device
;
1515 struct blk_integrity
;
1517 static inline int blk_integrity_rq(struct request
*rq
)
1521 static inline int blk_rq_count_integrity_sg(struct request_queue
*q
,
1526 static inline int blk_rq_map_integrity_sg(struct request_queue
*q
,
1528 struct scatterlist
*s
)
1532 static inline struct blk_integrity
*bdev_get_integrity(struct block_device
*b
)
1536 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1540 static inline int blk_integrity_compare(struct gendisk
*a
, struct gendisk
*b
)
1544 static inline int blk_integrity_register(struct gendisk
*d
,
1545 struct blk_integrity
*b
)
1549 static inline void blk_integrity_unregister(struct gendisk
*d
)
1552 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1556 static inline unsigned short queue_max_integrity_segments(struct request_queue
*q
)
1560 static inline int blk_integrity_merge_rq(struct request_queue
*rq
,
1566 static inline int blk_integrity_merge_bio(struct request_queue
*rq
,
1572 static inline bool blk_integrity_is_initialized(struct gendisk
*g
)
1577 #endif /* CONFIG_BLK_DEV_INTEGRITY */
1579 struct block_device_operations
{
1580 int (*open
) (struct block_device
*, fmode_t
);
1581 void (*release
) (struct gendisk
*, fmode_t
);
1582 int (*ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1583 int (*compat_ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1584 int (*direct_access
) (struct block_device
*, sector_t
,
1585 void **, unsigned long *);
1586 unsigned int (*check_events
) (struct gendisk
*disk
,
1587 unsigned int clearing
);
1588 /* ->media_changed() is DEPRECATED, use ->check_events() instead */
1589 int (*media_changed
) (struct gendisk
*);
1590 void (*unlock_native_capacity
) (struct gendisk
*);
1591 int (*revalidate_disk
) (struct gendisk
*);
1592 int (*getgeo
)(struct block_device
*, struct hd_geometry
*);
1593 /* this callback is with swap_lock and sometimes page table lock held */
1594 void (*swap_slot_free_notify
) (struct block_device
*, unsigned long);
1595 struct module
*owner
;
1598 extern int __blkdev_driver_ioctl(struct block_device
*, fmode_t
, unsigned int,
1600 #else /* CONFIG_BLOCK */
1602 * stubs for when the block layer is configured out
1604 #define buffer_heads_over_limit 0
1606 static inline long nr_blockdev_pages(void)
1614 static inline void blk_start_plug(struct blk_plug
*plug
)
1618 static inline void blk_finish_plug(struct blk_plug
*plug
)
1622 static inline void blk_flush_plug(struct task_struct
*task
)
1626 static inline void blk_schedule_flush_plug(struct task_struct
*task
)
1631 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1636 #endif /* CONFIG_BLOCK */