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/timer.h>
12 #include <linux/workqueue.h>
13 #include <linux/pagemap.h>
14 #include <linux/backing-dev.h>
15 #include <linux/wait.h>
16 #include <linux/mempool.h>
17 #include <linux/bio.h>
18 #include <linux/stringify.h>
19 #include <linux/gfp.h>
20 #include <linux/bsg.h>
21 #include <linux/smp.h>
22 #include <linux/rcupdate.h>
24 #include <asm/scatterlist.h>
27 struct scsi_ioctl_command
;
30 struct elevator_queue
;
31 struct request_pm_state
;
38 #define BLKDEV_MIN_RQ 4
39 #define BLKDEV_MAX_RQ 128 /* Default maximum */
42 * Maximum number of blkcg policies allowed to be registered concurrently.
43 * Defined here to simplify include dependency.
45 #define BLKCG_MAX_POLS 2
48 typedef void (rq_end_io_fn
)(struct request
*, int);
50 #define BLK_RL_SYNCFULL (1U << 0)
51 #define BLK_RL_ASYNCFULL (1U << 1)
54 struct request_queue
*q
; /* the queue this rl belongs to */
55 #ifdef CONFIG_BLK_CGROUP
56 struct blkcg_gq
*blkg
; /* blkg this request pool belongs to */
59 * count[], starved[], and wait[] are indexed by
60 * BLK_RW_SYNC/BLK_RW_ASYNC
65 wait_queue_head_t wait
[2];
70 * request command types
72 enum rq_cmd_type_bits
{
73 REQ_TYPE_FS
= 1, /* fs request */
74 REQ_TYPE_BLOCK_PC
, /* scsi command */
75 REQ_TYPE_SENSE
, /* sense request */
76 REQ_TYPE_PM_SUSPEND
, /* suspend request */
77 REQ_TYPE_PM_RESUME
, /* resume request */
78 REQ_TYPE_PM_SHUTDOWN
, /* shutdown request */
79 REQ_TYPE_SPECIAL
, /* driver defined type */
81 * for ATA/ATAPI devices. this really doesn't belong here, ide should
82 * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver
83 * private REQ_LB opcodes to differentiate what type of request this is
85 REQ_TYPE_ATA_TASKFILE
,
89 #define BLK_MAX_CDB 16
92 * try to put the fields that are referenced together in the same cacheline.
93 * if you modify this structure, be sure to check block/blk-core.c:blk_rq_init()
97 struct list_head queuelist
;
98 struct call_single_data csd
;
100 struct request_queue
*q
;
102 unsigned int cmd_flags
;
103 enum rq_cmd_type_bits cmd_type
;
104 unsigned long atomic_flags
;
108 /* the following two fields are internal, NEVER access directly */
109 unsigned int __data_len
; /* total data len */
110 sector_t __sector
; /* sector cursor */
115 struct hlist_node hash
; /* merge hash */
117 * The rb_node is only used inside the io scheduler, requests
118 * are pruned when moved to the dispatch queue. So let the
119 * completion_data share space with the rb_node.
122 struct rb_node rb_node
; /* sort/lookup */
123 void *completion_data
;
127 * Three pointers are available for the IO schedulers, if they need
128 * more they have to dynamically allocate it. Flush requests are
129 * never put on the IO scheduler. So let the flush fields share
130 * space with the elevator data.
140 struct list_head list
;
141 rq_end_io_fn
*saved_end_io
;
145 struct gendisk
*rq_disk
;
146 struct hd_struct
*part
;
147 unsigned long start_time
;
148 #ifdef CONFIG_BLK_CGROUP
149 struct request_list
*rl
; /* rl this rq is alloced from */
150 unsigned long long start_time_ns
;
151 unsigned long long io_start_time_ns
; /* when passed to hardware */
153 /* Number of scatter-gather DMA addr+len pairs after
154 * physical address coalescing is performed.
156 unsigned short nr_phys_segments
;
157 #if defined(CONFIG_BLK_DEV_INTEGRITY)
158 unsigned short nr_integrity_segments
;
161 unsigned short ioprio
;
165 void *special
; /* opaque pointer available for LLD use */
166 char *buffer
; /* kaddr of the current segment if available */
172 * when request is used as a packet command carrier
174 unsigned char __cmd
[BLK_MAX_CDB
];
176 unsigned short cmd_len
;
178 unsigned int extra_len
; /* length of alignment and padding */
179 unsigned int sense_len
;
180 unsigned int resid_len
; /* residual count */
183 unsigned long deadline
;
184 struct list_head timeout_list
;
185 unsigned int timeout
;
189 * completion callback.
191 rq_end_io_fn
*end_io
;
195 struct request
*next_rq
;
198 static inline unsigned short req_get_ioprio(struct request
*req
)
204 * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME
205 * requests. Some step values could eventually be made generic.
207 struct request_pm_state
209 /* PM state machine step value, currently driver specific */
211 /* requested PM state value (S1, S2, S3, S4, ...) */
213 void* data
; /* for driver use */
216 #include <linux/elevator.h>
218 typedef void (request_fn_proc
) (struct request_queue
*q
);
219 typedef void (make_request_fn
) (struct request_queue
*q
, struct bio
*bio
);
220 typedef int (prep_rq_fn
) (struct request_queue
*, struct request
*);
221 typedef void (unprep_rq_fn
) (struct request_queue
*, struct request
*);
224 struct bvec_merge_data
{
225 struct block_device
*bi_bdev
;
230 typedef int (merge_bvec_fn
) (struct request_queue
*, struct bvec_merge_data
*,
232 typedef void (softirq_done_fn
)(struct request
*);
233 typedef int (dma_drain_needed_fn
)(struct request
*);
234 typedef int (lld_busy_fn
) (struct request_queue
*q
);
235 typedef int (bsg_job_fn
) (struct bsg_job
*);
237 enum blk_eh_timer_return
{
243 typedef enum blk_eh_timer_return (rq_timed_out_fn
)(struct request
*);
245 enum blk_queue_state
{
250 struct blk_queue_tag
{
251 struct request
**tag_index
; /* map of busy tags */
252 unsigned long *tag_map
; /* bit map of free/busy tags */
253 int busy
; /* current depth */
254 int max_depth
; /* what we will send to device */
255 int real_max_depth
; /* what the array can hold */
256 atomic_t refcnt
; /* map can be shared */
259 #define BLK_SCSI_MAX_CMDS (256)
260 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
262 struct queue_limits
{
263 unsigned long bounce_pfn
;
264 unsigned long seg_boundary_mask
;
266 unsigned int max_hw_sectors
;
267 unsigned int max_sectors
;
268 unsigned int max_segment_size
;
269 unsigned int physical_block_size
;
270 unsigned int alignment_offset
;
273 unsigned int max_discard_sectors
;
274 unsigned int max_write_same_sectors
;
275 unsigned int discard_granularity
;
276 unsigned int discard_alignment
;
278 unsigned short logical_block_size
;
279 unsigned short max_segments
;
280 unsigned short max_integrity_segments
;
282 unsigned char misaligned
;
283 unsigned char discard_misaligned
;
284 unsigned char cluster
;
285 unsigned char discard_zeroes_data
;
288 struct request_queue
{
290 * Together with queue_head for cacheline sharing
292 struct list_head queue_head
;
293 struct request
*last_merge
;
294 struct elevator_queue
*elevator
;
295 int nr_rqs
[2]; /* # allocated [a]sync rqs */
296 int nr_rqs_elvpriv
; /* # allocated rqs w/ elvpriv */
299 * If blkcg is not used, @q->root_rl serves all requests. If blkcg
300 * is used, root blkg allocates from @q->root_rl and all other
301 * blkgs from their own blkg->rl. Which one to use should be
302 * determined using bio_request_list().
304 struct request_list root_rl
;
306 request_fn_proc
*request_fn
;
307 make_request_fn
*make_request_fn
;
308 prep_rq_fn
*prep_rq_fn
;
309 unprep_rq_fn
*unprep_rq_fn
;
310 merge_bvec_fn
*merge_bvec_fn
;
311 softirq_done_fn
*softirq_done_fn
;
312 rq_timed_out_fn
*rq_timed_out_fn
;
313 dma_drain_needed_fn
*dma_drain_needed
;
314 lld_busy_fn
*lld_busy_fn
;
317 * Dispatch queue sorting
320 struct request
*boundary_rq
;
323 * Delayed queue handling
325 struct delayed_work delay_work
;
327 struct backing_dev_info backing_dev_info
;
330 * The queue owner gets to use this for whatever they like.
331 * ll_rw_blk doesn't touch it.
336 * various queue flags, see QUEUE_* below
338 unsigned long queue_flags
;
341 * ida allocated id for this queue. Used to index queues from
347 * queue needs bounce pages for pages above this limit
352 * protects queue structures from reentrancy. ->__queue_lock should
353 * _never_ be used directly, it is queue private. always use
356 spinlock_t __queue_lock
;
357 spinlock_t
*queue_lock
;
367 unsigned long nr_requests
; /* Max # of requests */
368 unsigned int nr_congestion_on
;
369 unsigned int nr_congestion_off
;
370 unsigned int nr_batching
;
372 unsigned int dma_drain_size
;
373 void *dma_drain_buffer
;
374 unsigned int dma_pad_mask
;
375 unsigned int dma_alignment
;
377 struct blk_queue_tag
*queue_tags
;
378 struct list_head tag_busy_list
;
380 unsigned int nr_sorted
;
381 unsigned int in_flight
[2];
383 * Number of active block driver functions for which blk_drain_queue()
384 * must wait. Must be incremented around functions that unlock the
385 * queue_lock internally, e.g. scsi_request_fn().
387 unsigned int request_fn_active
;
389 unsigned int rq_timeout
;
390 struct timer_list timeout
;
391 struct list_head timeout_list
;
393 struct list_head icq_list
;
394 #ifdef CONFIG_BLK_CGROUP
395 DECLARE_BITMAP (blkcg_pols
, BLKCG_MAX_POLS
);
396 struct blkcg_gq
*root_blkg
;
397 struct list_head blkg_list
;
400 struct queue_limits limits
;
405 unsigned int sg_timeout
;
406 unsigned int sg_reserved_size
;
408 #ifdef CONFIG_BLK_DEV_IO_TRACE
409 struct blk_trace
*blk_trace
;
412 * for flush operations
414 unsigned int flush_flags
;
415 unsigned int flush_not_queueable
:1;
416 unsigned int flush_queue_delayed
:1;
417 unsigned int flush_pending_idx
:1;
418 unsigned int flush_running_idx
:1;
419 unsigned long flush_pending_since
;
420 struct list_head flush_queue
[2];
421 struct list_head flush_data_in_flight
;
422 struct request flush_rq
;
424 struct mutex sysfs_lock
;
428 #if defined(CONFIG_BLK_DEV_BSG)
429 bsg_job_fn
*bsg_job_fn
;
431 struct bsg_class_device bsg_dev
;
434 #ifdef CONFIG_BLK_CGROUP
435 struct list_head all_q_node
;
437 #ifdef CONFIG_BLK_DEV_THROTTLING
439 struct throtl_data
*td
;
441 struct rcu_head rcu_head
;
444 #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */
445 #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */
446 #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */
447 #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */
448 #define QUEUE_FLAG_DYING 5 /* queue being torn down */
449 #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */
450 #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */
451 #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */
452 #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */
453 #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */
454 #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */
455 #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */
456 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
457 #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */
458 #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */
459 #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */
460 #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */
461 #define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */
462 #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */
463 #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */
465 #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
466 (1 << QUEUE_FLAG_STACKABLE) | \
467 (1 << QUEUE_FLAG_SAME_COMP) | \
468 (1 << QUEUE_FLAG_ADD_RANDOM))
470 static inline void queue_lockdep_assert_held(struct request_queue
*q
)
473 lockdep_assert_held(q
->queue_lock
);
476 static inline void queue_flag_set_unlocked(unsigned int flag
,
477 struct request_queue
*q
)
479 __set_bit(flag
, &q
->queue_flags
);
482 static inline int queue_flag_test_and_clear(unsigned int flag
,
483 struct request_queue
*q
)
485 queue_lockdep_assert_held(q
);
487 if (test_bit(flag
, &q
->queue_flags
)) {
488 __clear_bit(flag
, &q
->queue_flags
);
495 static inline int queue_flag_test_and_set(unsigned int flag
,
496 struct request_queue
*q
)
498 queue_lockdep_assert_held(q
);
500 if (!test_bit(flag
, &q
->queue_flags
)) {
501 __set_bit(flag
, &q
->queue_flags
);
508 static inline void queue_flag_set(unsigned int flag
, struct request_queue
*q
)
510 queue_lockdep_assert_held(q
);
511 __set_bit(flag
, &q
->queue_flags
);
514 static inline void queue_flag_clear_unlocked(unsigned int flag
,
515 struct request_queue
*q
)
517 __clear_bit(flag
, &q
->queue_flags
);
520 static inline int queue_in_flight(struct request_queue
*q
)
522 return q
->in_flight
[0] + q
->in_flight
[1];
525 static inline void queue_flag_clear(unsigned int flag
, struct request_queue
*q
)
527 queue_lockdep_assert_held(q
);
528 __clear_bit(flag
, &q
->queue_flags
);
531 #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
532 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
533 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
534 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
535 #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags)
536 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
537 #define blk_queue_noxmerges(q) \
538 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
539 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
540 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
541 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
542 #define blk_queue_stackable(q) \
543 test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
544 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
545 #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \
546 test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags))
548 #define blk_noretry_request(rq) \
549 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
550 REQ_FAILFAST_DRIVER))
552 #define blk_account_rq(rq) \
553 (((rq)->cmd_flags & REQ_STARTED) && \
554 ((rq)->cmd_type == REQ_TYPE_FS))
556 #define blk_pm_request(rq) \
557 ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \
558 (rq)->cmd_type == REQ_TYPE_PM_RESUME)
560 #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
561 #define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
562 /* rq->queuelist of dequeued request must be list_empty() */
563 #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
565 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
567 #define rq_data_dir(rq) ((rq)->cmd_flags & 1)
569 static inline unsigned int blk_queue_cluster(struct request_queue
*q
)
571 return q
->limits
.cluster
;
575 * We regard a request as sync, if either a read or a sync write
577 static inline bool rw_is_sync(unsigned int rw_flags
)
579 return !(rw_flags
& REQ_WRITE
) || (rw_flags
& REQ_SYNC
);
582 static inline bool rq_is_sync(struct request
*rq
)
584 return rw_is_sync(rq
->cmd_flags
);
587 static inline bool blk_rl_full(struct request_list
*rl
, bool sync
)
589 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
591 return rl
->flags
& flag
;
594 static inline void blk_set_rl_full(struct request_list
*rl
, bool sync
)
596 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
601 static inline void blk_clear_rl_full(struct request_list
*rl
, bool sync
)
603 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
608 static inline bool rq_mergeable(struct request
*rq
)
610 if (rq
->cmd_type
!= REQ_TYPE_FS
)
613 if (rq
->cmd_flags
& REQ_NOMERGE_FLAGS
)
619 static inline bool blk_check_merge_flags(unsigned int flags1
,
622 if ((flags1
& REQ_DISCARD
) != (flags2
& REQ_DISCARD
))
625 if ((flags1
& REQ_SECURE
) != (flags2
& REQ_SECURE
))
628 if ((flags1
& REQ_WRITE_SAME
) != (flags2
& REQ_WRITE_SAME
))
634 static inline bool blk_write_same_mergeable(struct bio
*a
, struct bio
*b
)
636 if (bio_data(a
) == bio_data(b
))
643 * q->prep_rq_fn return values
645 #define BLKPREP_OK 0 /* serve it */
646 #define BLKPREP_KILL 1 /* fatal error, kill */
647 #define BLKPREP_DEFER 2 /* leave on queue */
649 extern unsigned long blk_max_low_pfn
, blk_max_pfn
;
652 * standard bounce addresses:
654 * BLK_BOUNCE_HIGH : bounce all highmem pages
655 * BLK_BOUNCE_ANY : don't bounce anything
656 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
659 #if BITS_PER_LONG == 32
660 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
662 #define BLK_BOUNCE_HIGH -1ULL
664 #define BLK_BOUNCE_ANY (-1ULL)
665 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
668 * default timeout for SG_IO if none specified
670 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
671 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
674 extern int init_emergency_isa_pool(void);
675 extern void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
);
677 static inline int init_emergency_isa_pool(void)
681 static inline void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
)
684 #endif /* CONFIG_MMU */
690 unsigned long offset
;
695 struct req_iterator
{
700 /* This should not be used directly - use rq_for_each_segment */
701 #define for_each_bio(_bio) \
702 for (; _bio; _bio = _bio->bi_next)
703 #define __rq_for_each_bio(_bio, rq) \
705 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
707 #define rq_for_each_segment(bvl, _rq, _iter) \
708 __rq_for_each_bio(_iter.bio, _rq) \
709 bio_for_each_segment(bvl, _iter.bio, _iter.i)
711 #define rq_iter_last(rq, _iter) \
712 (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1)
714 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
715 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
717 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
718 extern void rq_flush_dcache_pages(struct request
*rq
);
720 static inline void rq_flush_dcache_pages(struct request
*rq
)
725 extern int blk_register_queue(struct gendisk
*disk
);
726 extern void blk_unregister_queue(struct gendisk
*disk
);
727 extern void generic_make_request(struct bio
*bio
);
728 extern void blk_rq_init(struct request_queue
*q
, struct request
*rq
);
729 extern void blk_put_request(struct request
*);
730 extern void __blk_put_request(struct request_queue
*, struct request
*);
731 extern struct request
*blk_get_request(struct request_queue
*, int, gfp_t
);
732 extern struct request
*blk_make_request(struct request_queue
*, struct bio
*,
734 extern void blk_requeue_request(struct request_queue
*, struct request
*);
735 extern void blk_add_request_payload(struct request
*rq
, struct page
*page
,
737 extern int blk_rq_check_limits(struct request_queue
*q
, struct request
*rq
);
738 extern int blk_lld_busy(struct request_queue
*q
);
739 extern int blk_rq_prep_clone(struct request
*rq
, struct request
*rq_src
,
740 struct bio_set
*bs
, gfp_t gfp_mask
,
741 int (*bio_ctr
)(struct bio
*, struct bio
*, void *),
743 extern void blk_rq_unprep_clone(struct request
*rq
);
744 extern int blk_insert_cloned_request(struct request_queue
*q
,
746 extern void blk_delay_queue(struct request_queue
*, unsigned long);
747 extern void blk_recount_segments(struct request_queue
*, struct bio
*);
748 extern int scsi_verify_blk_ioctl(struct block_device
*, unsigned int);
749 extern int scsi_cmd_blk_ioctl(struct block_device
*, fmode_t
,
750 unsigned int, void __user
*);
751 extern int scsi_cmd_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
752 unsigned int, void __user
*);
753 extern int sg_scsi_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
754 struct scsi_ioctl_command __user
*);
756 extern void blk_queue_bio(struct request_queue
*q
, struct bio
*bio
);
759 * A queue has just exitted congestion. Note this in the global counter of
760 * congested queues, and wake up anyone who was waiting for requests to be
763 static inline void blk_clear_queue_congested(struct request_queue
*q
, int sync
)
765 clear_bdi_congested(&q
->backing_dev_info
, sync
);
769 * A queue has just entered congestion. Flag that in the queue's VM-visible
770 * state flags and increment the global gounter of congested queues.
772 static inline void blk_set_queue_congested(struct request_queue
*q
, int sync
)
774 set_bdi_congested(&q
->backing_dev_info
, sync
);
777 extern void blk_start_queue(struct request_queue
*q
);
778 extern void blk_stop_queue(struct request_queue
*q
);
779 extern void blk_sync_queue(struct request_queue
*q
);
780 extern void __blk_stop_queue(struct request_queue
*q
);
781 extern void __blk_run_queue(struct request_queue
*q
);
782 extern void blk_run_queue(struct request_queue
*);
783 extern void blk_run_queue_async(struct request_queue
*q
);
784 extern int blk_rq_map_user(struct request_queue
*, struct request
*,
785 struct rq_map_data
*, void __user
*, unsigned long,
787 extern int blk_rq_unmap_user(struct bio
*);
788 extern int blk_rq_map_kern(struct request_queue
*, struct request
*, void *, unsigned int, gfp_t
);
789 extern int blk_rq_map_user_iov(struct request_queue
*, struct request
*,
790 struct rq_map_data
*, struct sg_iovec
*, int,
791 unsigned int, gfp_t
);
792 extern int blk_execute_rq(struct request_queue
*, struct gendisk
*,
793 struct request
*, int);
794 extern void blk_execute_rq_nowait(struct request_queue
*, struct gendisk
*,
795 struct request
*, int, rq_end_io_fn
*);
797 static inline struct request_queue
*bdev_get_queue(struct block_device
*bdev
)
799 return bdev
->bd_disk
->queue
;
803 * blk_rq_pos() : the current sector
804 * blk_rq_bytes() : bytes left in the entire request
805 * blk_rq_cur_bytes() : bytes left in the current segment
806 * blk_rq_err_bytes() : bytes left till the next error boundary
807 * blk_rq_sectors() : sectors left in the entire request
808 * blk_rq_cur_sectors() : sectors left in the current segment
810 static inline sector_t
blk_rq_pos(const struct request
*rq
)
815 static inline unsigned int blk_rq_bytes(const struct request
*rq
)
817 return rq
->__data_len
;
820 static inline int blk_rq_cur_bytes(const struct request
*rq
)
822 return rq
->bio
? bio_cur_bytes(rq
->bio
) : 0;
825 extern unsigned int blk_rq_err_bytes(const struct request
*rq
);
827 static inline unsigned int blk_rq_sectors(const struct request
*rq
)
829 return blk_rq_bytes(rq
) >> 9;
832 static inline unsigned int blk_rq_cur_sectors(const struct request
*rq
)
834 return blk_rq_cur_bytes(rq
) >> 9;
837 static inline unsigned int blk_queue_get_max_sectors(struct request_queue
*q
,
838 unsigned int cmd_flags
)
840 if (unlikely(cmd_flags
& REQ_DISCARD
))
841 return q
->limits
.max_discard_sectors
;
843 if (unlikely(cmd_flags
& REQ_WRITE_SAME
))
844 return q
->limits
.max_write_same_sectors
;
846 return q
->limits
.max_sectors
;
849 static inline unsigned int blk_rq_get_max_sectors(struct request
*rq
)
851 struct request_queue
*q
= rq
->q
;
853 if (unlikely(rq
->cmd_type
== REQ_TYPE_BLOCK_PC
))
854 return q
->limits
.max_hw_sectors
;
856 return blk_queue_get_max_sectors(q
, rq
->cmd_flags
);
860 * Request issue related functions.
862 extern struct request
*blk_peek_request(struct request_queue
*q
);
863 extern void blk_start_request(struct request
*rq
);
864 extern struct request
*blk_fetch_request(struct request_queue
*q
);
867 * Request completion related functions.
869 * blk_update_request() completes given number of bytes and updates
870 * the request without completing it.
872 * blk_end_request() and friends. __blk_end_request() must be called
873 * with the request queue spinlock acquired.
875 * Several drivers define their own end_request and call
876 * blk_end_request() for parts of the original function.
877 * This prevents code duplication in drivers.
879 extern bool blk_update_request(struct request
*rq
, int error
,
880 unsigned int nr_bytes
);
881 extern bool blk_end_request(struct request
*rq
, int error
,
882 unsigned int nr_bytes
);
883 extern void blk_end_request_all(struct request
*rq
, int error
);
884 extern bool blk_end_request_cur(struct request
*rq
, int error
);
885 extern bool blk_end_request_err(struct request
*rq
, int error
);
886 extern bool __blk_end_request(struct request
*rq
, int error
,
887 unsigned int nr_bytes
);
888 extern void __blk_end_request_all(struct request
*rq
, int error
);
889 extern bool __blk_end_request_cur(struct request
*rq
, int error
);
890 extern bool __blk_end_request_err(struct request
*rq
, int error
);
892 extern void blk_complete_request(struct request
*);
893 extern void __blk_complete_request(struct request
*);
894 extern void blk_abort_request(struct request
*);
895 extern void blk_unprep_request(struct request
*);
898 * Access functions for manipulating queue properties
900 extern struct request_queue
*blk_init_queue_node(request_fn_proc
*rfn
,
901 spinlock_t
*lock
, int node_id
);
902 extern struct request_queue
*blk_init_queue(request_fn_proc
*, spinlock_t
*);
903 extern struct request_queue
*blk_init_allocated_queue(struct request_queue
*,
904 request_fn_proc
*, spinlock_t
*);
905 extern void blk_cleanup_queue(struct request_queue
*);
906 extern void blk_queue_make_request(struct request_queue
*, make_request_fn
*);
907 extern void blk_queue_bounce_limit(struct request_queue
*, u64
);
908 extern void blk_limits_max_hw_sectors(struct queue_limits
*, unsigned int);
909 extern void blk_queue_max_hw_sectors(struct request_queue
*, unsigned int);
910 extern void blk_queue_max_segments(struct request_queue
*, unsigned short);
911 extern void blk_queue_max_segment_size(struct request_queue
*, unsigned int);
912 extern void blk_queue_max_discard_sectors(struct request_queue
*q
,
913 unsigned int max_discard_sectors
);
914 extern void blk_queue_max_write_same_sectors(struct request_queue
*q
,
915 unsigned int max_write_same_sectors
);
916 extern void blk_queue_logical_block_size(struct request_queue
*, unsigned short);
917 extern void blk_queue_physical_block_size(struct request_queue
*, unsigned int);
918 extern void blk_queue_alignment_offset(struct request_queue
*q
,
919 unsigned int alignment
);
920 extern void blk_limits_io_min(struct queue_limits
*limits
, unsigned int min
);
921 extern void blk_queue_io_min(struct request_queue
*q
, unsigned int min
);
922 extern void blk_limits_io_opt(struct queue_limits
*limits
, unsigned int opt
);
923 extern void blk_queue_io_opt(struct request_queue
*q
, unsigned int opt
);
924 extern void blk_set_default_limits(struct queue_limits
*lim
);
925 extern void blk_set_stacking_limits(struct queue_limits
*lim
);
926 extern int blk_stack_limits(struct queue_limits
*t
, struct queue_limits
*b
,
928 extern int bdev_stack_limits(struct queue_limits
*t
, struct block_device
*bdev
,
930 extern void disk_stack_limits(struct gendisk
*disk
, struct block_device
*bdev
,
932 extern void blk_queue_stack_limits(struct request_queue
*t
, struct request_queue
*b
);
933 extern void blk_queue_dma_pad(struct request_queue
*, unsigned int);
934 extern void blk_queue_update_dma_pad(struct request_queue
*, unsigned int);
935 extern int blk_queue_dma_drain(struct request_queue
*q
,
936 dma_drain_needed_fn
*dma_drain_needed
,
937 void *buf
, unsigned int size
);
938 extern void blk_queue_lld_busy(struct request_queue
*q
, lld_busy_fn
*fn
);
939 extern void blk_queue_segment_boundary(struct request_queue
*, unsigned long);
940 extern void blk_queue_prep_rq(struct request_queue
*, prep_rq_fn
*pfn
);
941 extern void blk_queue_unprep_rq(struct request_queue
*, unprep_rq_fn
*ufn
);
942 extern void blk_queue_merge_bvec(struct request_queue
*, merge_bvec_fn
*);
943 extern void blk_queue_dma_alignment(struct request_queue
*, int);
944 extern void blk_queue_update_dma_alignment(struct request_queue
*, int);
945 extern void blk_queue_softirq_done(struct request_queue
*, softirq_done_fn
*);
946 extern void blk_queue_rq_timed_out(struct request_queue
*, rq_timed_out_fn
*);
947 extern void blk_queue_rq_timeout(struct request_queue
*, unsigned int);
948 extern void blk_queue_flush(struct request_queue
*q
, unsigned int flush
);
949 extern void blk_queue_flush_queueable(struct request_queue
*q
, bool queueable
);
950 extern struct backing_dev_info
*blk_get_backing_dev_info(struct block_device
*bdev
);
952 extern int blk_rq_map_sg(struct request_queue
*, struct request
*, struct scatterlist
*);
953 extern int blk_bio_map_sg(struct request_queue
*q
, struct bio
*bio
,
954 struct scatterlist
*sglist
);
955 extern void blk_dump_rq_flags(struct request
*, char *);
956 extern long nr_blockdev_pages(void);
958 bool __must_check
blk_get_queue(struct request_queue
*);
959 struct request_queue
*blk_alloc_queue(gfp_t
);
960 struct request_queue
*blk_alloc_queue_node(gfp_t
, int);
961 extern void blk_put_queue(struct request_queue
*);
964 * blk_plug permits building a queue of related requests by holding the I/O
965 * fragments for a short period. This allows merging of sequential requests
966 * into single larger request. As the requests are moved from a per-task list to
967 * the device's request_queue in a batch, this results in improved scalability
968 * as the lock contention for request_queue lock is reduced.
970 * It is ok not to disable preemption when adding the request to the plug list
971 * or when attempting a merge, because blk_schedule_flush_list() will only flush
972 * the plug list when the task sleeps by itself. For details, please see
973 * schedule() where blk_schedule_flush_plug() is called.
976 unsigned long magic
; /* detect uninitialized use-cases */
977 struct list_head list
; /* requests */
978 struct list_head cb_list
; /* md requires an unplug callback */
980 #define BLK_MAX_REQUEST_COUNT 16
983 typedef void (*blk_plug_cb_fn
)(struct blk_plug_cb
*, bool);
985 struct list_head list
;
986 blk_plug_cb_fn callback
;
989 extern struct blk_plug_cb
*blk_check_plugged(blk_plug_cb_fn unplug
,
990 void *data
, int size
);
991 extern void blk_start_plug(struct blk_plug
*);
992 extern void blk_finish_plug(struct blk_plug
*);
993 extern void blk_flush_plug_list(struct blk_plug
*, bool);
995 static inline void blk_flush_plug(struct task_struct
*tsk
)
997 struct blk_plug
*plug
= tsk
->plug
;
1000 blk_flush_plug_list(plug
, false);
1003 static inline void blk_schedule_flush_plug(struct task_struct
*tsk
)
1005 struct blk_plug
*plug
= tsk
->plug
;
1008 blk_flush_plug_list(plug
, true);
1011 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1013 struct blk_plug
*plug
= tsk
->plug
;
1015 return plug
&& (!list_empty(&plug
->list
) || !list_empty(&plug
->cb_list
));
1021 #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED)
1022 extern int blk_queue_start_tag(struct request_queue
*, struct request
*);
1023 extern struct request
*blk_queue_find_tag(struct request_queue
*, int);
1024 extern void blk_queue_end_tag(struct request_queue
*, struct request
*);
1025 extern int blk_queue_init_tags(struct request_queue
*, int, struct blk_queue_tag
*);
1026 extern void blk_queue_free_tags(struct request_queue
*);
1027 extern int blk_queue_resize_tags(struct request_queue
*, int);
1028 extern void blk_queue_invalidate_tags(struct request_queue
*);
1029 extern struct blk_queue_tag
*blk_init_tags(int);
1030 extern void blk_free_tags(struct blk_queue_tag
*);
1032 static inline struct request
*blk_map_queue_find_tag(struct blk_queue_tag
*bqt
,
1035 if (unlikely(bqt
== NULL
|| tag
>= bqt
->real_max_depth
))
1037 return bqt
->tag_index
[tag
];
1040 #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */
1042 extern int blkdev_issue_flush(struct block_device
*, gfp_t
, sector_t
*);
1043 extern int blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1044 sector_t nr_sects
, gfp_t gfp_mask
, unsigned long flags
);
1045 extern int blkdev_issue_write_same(struct block_device
*bdev
, sector_t sector
,
1046 sector_t nr_sects
, gfp_t gfp_mask
, struct page
*page
);
1047 extern int blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1048 sector_t nr_sects
, gfp_t gfp_mask
);
1049 static inline int sb_issue_discard(struct super_block
*sb
, sector_t block
,
1050 sector_t nr_blocks
, gfp_t gfp_mask
, unsigned long flags
)
1052 return blkdev_issue_discard(sb
->s_bdev
, block
<< (sb
->s_blocksize_bits
- 9),
1053 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1056 static inline int sb_issue_zeroout(struct super_block
*sb
, sector_t block
,
1057 sector_t nr_blocks
, gfp_t gfp_mask
)
1059 return blkdev_issue_zeroout(sb
->s_bdev
,
1060 block
<< (sb
->s_blocksize_bits
- 9),
1061 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1065 extern int blk_verify_command(unsigned char *cmd
, fmode_t has_write_perm
);
1067 enum blk_default_limits
{
1068 BLK_MAX_SEGMENTS
= 128,
1069 BLK_SAFE_MAX_SECTORS
= 255,
1070 BLK_DEF_MAX_SECTORS
= 1024,
1071 BLK_MAX_SEGMENT_SIZE
= 65536,
1072 BLK_SEG_BOUNDARY_MASK
= 0xFFFFFFFFUL
,
1075 #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
1077 static inline unsigned long queue_bounce_pfn(struct request_queue
*q
)
1079 return q
->limits
.bounce_pfn
;
1082 static inline unsigned long queue_segment_boundary(struct request_queue
*q
)
1084 return q
->limits
.seg_boundary_mask
;
1087 static inline unsigned int queue_max_sectors(struct request_queue
*q
)
1089 return q
->limits
.max_sectors
;
1092 static inline unsigned int queue_max_hw_sectors(struct request_queue
*q
)
1094 return q
->limits
.max_hw_sectors
;
1097 static inline unsigned short queue_max_segments(struct request_queue
*q
)
1099 return q
->limits
.max_segments
;
1102 static inline unsigned int queue_max_segment_size(struct request_queue
*q
)
1104 return q
->limits
.max_segment_size
;
1107 static inline unsigned short queue_logical_block_size(struct request_queue
*q
)
1111 if (q
&& q
->limits
.logical_block_size
)
1112 retval
= q
->limits
.logical_block_size
;
1117 static inline unsigned short bdev_logical_block_size(struct block_device
*bdev
)
1119 return queue_logical_block_size(bdev_get_queue(bdev
));
1122 static inline unsigned int queue_physical_block_size(struct request_queue
*q
)
1124 return q
->limits
.physical_block_size
;
1127 static inline unsigned int bdev_physical_block_size(struct block_device
*bdev
)
1129 return queue_physical_block_size(bdev_get_queue(bdev
));
1132 static inline unsigned int queue_io_min(struct request_queue
*q
)
1134 return q
->limits
.io_min
;
1137 static inline int bdev_io_min(struct block_device
*bdev
)
1139 return queue_io_min(bdev_get_queue(bdev
));
1142 static inline unsigned int queue_io_opt(struct request_queue
*q
)
1144 return q
->limits
.io_opt
;
1147 static inline int bdev_io_opt(struct block_device
*bdev
)
1149 return queue_io_opt(bdev_get_queue(bdev
));
1152 static inline int queue_alignment_offset(struct request_queue
*q
)
1154 if (q
->limits
.misaligned
)
1157 return q
->limits
.alignment_offset
;
1160 static inline int queue_limit_alignment_offset(struct queue_limits
*lim
, sector_t sector
)
1162 unsigned int granularity
= max(lim
->physical_block_size
, lim
->io_min
);
1163 unsigned int alignment
= (sector
<< 9) & (granularity
- 1);
1165 return (granularity
+ lim
->alignment_offset
- alignment
)
1166 & (granularity
- 1);
1169 static inline int bdev_alignment_offset(struct block_device
*bdev
)
1171 struct request_queue
*q
= bdev_get_queue(bdev
);
1173 if (q
->limits
.misaligned
)
1176 if (bdev
!= bdev
->bd_contains
)
1177 return bdev
->bd_part
->alignment_offset
;
1179 return q
->limits
.alignment_offset
;
1182 static inline int queue_discard_alignment(struct request_queue
*q
)
1184 if (q
->limits
.discard_misaligned
)
1187 return q
->limits
.discard_alignment
;
1190 static inline int queue_limit_discard_alignment(struct queue_limits
*lim
, sector_t sector
)
1192 unsigned int alignment
, granularity
, offset
;
1194 if (!lim
->max_discard_sectors
)
1197 /* Why are these in bytes, not sectors? */
1198 alignment
= lim
->discard_alignment
>> 9;
1199 granularity
= lim
->discard_granularity
>> 9;
1203 /* Offset of the partition start in 'granularity' sectors */
1204 offset
= sector_div(sector
, granularity
);
1206 /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1207 offset
= (granularity
+ alignment
- offset
) % granularity
;
1209 /* Turn it back into bytes, gaah */
1213 static inline int bdev_discard_alignment(struct block_device
*bdev
)
1215 struct request_queue
*q
= bdev_get_queue(bdev
);
1217 if (bdev
!= bdev
->bd_contains
)
1218 return bdev
->bd_part
->discard_alignment
;
1220 return q
->limits
.discard_alignment
;
1223 static inline unsigned int queue_discard_zeroes_data(struct request_queue
*q
)
1225 if (q
->limits
.max_discard_sectors
&& q
->limits
.discard_zeroes_data
== 1)
1231 static inline unsigned int bdev_discard_zeroes_data(struct block_device
*bdev
)
1233 return queue_discard_zeroes_data(bdev_get_queue(bdev
));
1236 static inline unsigned int bdev_write_same(struct block_device
*bdev
)
1238 struct request_queue
*q
= bdev_get_queue(bdev
);
1241 return q
->limits
.max_write_same_sectors
;
1246 static inline int queue_dma_alignment(struct request_queue
*q
)
1248 return q
? q
->dma_alignment
: 511;
1251 static inline int blk_rq_aligned(struct request_queue
*q
, unsigned long addr
,
1254 unsigned int alignment
= queue_dma_alignment(q
) | q
->dma_pad_mask
;
1255 return !(addr
& alignment
) && !(len
& alignment
);
1258 /* assumes size > 256 */
1259 static inline unsigned int blksize_bits(unsigned int size
)
1261 unsigned int bits
= 8;
1265 } while (size
> 256);
1269 static inline unsigned int block_size(struct block_device
*bdev
)
1271 return bdev
->bd_block_size
;
1274 static inline bool queue_flush_queueable(struct request_queue
*q
)
1276 return !q
->flush_not_queueable
;
1279 typedef struct {struct page
*v
;} Sector
;
1281 unsigned char *read_dev_sector(struct block_device
*, sector_t
, Sector
*);
1283 static inline void put_dev_sector(Sector p
)
1285 page_cache_release(p
.v
);
1289 int kblockd_schedule_work(struct request_queue
*q
, struct work_struct
*work
);
1291 #ifdef CONFIG_BLK_CGROUP
1293 * This should not be using sched_clock(). A real patch is in progress
1294 * to fix this up, until that is in place we need to disable preemption
1295 * around sched_clock() in this function and set_io_start_time_ns().
1297 static inline void set_start_time_ns(struct request
*req
)
1300 req
->start_time_ns
= sched_clock();
1304 static inline void set_io_start_time_ns(struct request
*req
)
1307 req
->io_start_time_ns
= sched_clock();
1311 static inline uint64_t rq_start_time_ns(struct request
*req
)
1313 return req
->start_time_ns
;
1316 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1318 return req
->io_start_time_ns
;
1321 static inline void set_start_time_ns(struct request
*req
) {}
1322 static inline void set_io_start_time_ns(struct request
*req
) {}
1323 static inline uint64_t rq_start_time_ns(struct request
*req
)
1327 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1333 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1334 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1335 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1336 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1338 #if defined(CONFIG_BLK_DEV_INTEGRITY)
1340 #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */
1341 #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */
1343 struct blk_integrity_exchg
{
1347 unsigned int data_size
;
1348 unsigned short sector_size
;
1349 const char *disk_name
;
1352 typedef void (integrity_gen_fn
) (struct blk_integrity_exchg
*);
1353 typedef int (integrity_vrfy_fn
) (struct blk_integrity_exchg
*);
1354 typedef void (integrity_set_tag_fn
) (void *, void *, unsigned int);
1355 typedef void (integrity_get_tag_fn
) (void *, void *, unsigned int);
1357 struct blk_integrity
{
1358 integrity_gen_fn
*generate_fn
;
1359 integrity_vrfy_fn
*verify_fn
;
1360 integrity_set_tag_fn
*set_tag_fn
;
1361 integrity_get_tag_fn
*get_tag_fn
;
1363 unsigned short flags
;
1364 unsigned short tuple_size
;
1365 unsigned short sector_size
;
1366 unsigned short tag_size
;
1370 struct kobject kobj
;
1373 extern bool blk_integrity_is_initialized(struct gendisk
*);
1374 extern int blk_integrity_register(struct gendisk
*, struct blk_integrity
*);
1375 extern void blk_integrity_unregister(struct gendisk
*);
1376 extern int blk_integrity_compare(struct gendisk
*, struct gendisk
*);
1377 extern int blk_rq_map_integrity_sg(struct request_queue
*, struct bio
*,
1378 struct scatterlist
*);
1379 extern int blk_rq_count_integrity_sg(struct request_queue
*, struct bio
*);
1380 extern int blk_integrity_merge_rq(struct request_queue
*, struct request
*,
1382 extern int blk_integrity_merge_bio(struct request_queue
*, struct request
*,
1386 struct blk_integrity
*bdev_get_integrity(struct block_device
*bdev
)
1388 return bdev
->bd_disk
->integrity
;
1391 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1393 return disk
->integrity
;
1396 static inline int blk_integrity_rq(struct request
*rq
)
1398 if (rq
->bio
== NULL
)
1401 return bio_integrity(rq
->bio
);
1404 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1407 q
->limits
.max_integrity_segments
= segs
;
1410 static inline unsigned short
1411 queue_max_integrity_segments(struct request_queue
*q
)
1413 return q
->limits
.max_integrity_segments
;
1416 #else /* CONFIG_BLK_DEV_INTEGRITY */
1419 struct block_device
;
1421 struct blk_integrity
;
1423 static inline int blk_integrity_rq(struct request
*rq
)
1427 static inline int blk_rq_count_integrity_sg(struct request_queue
*q
,
1432 static inline int blk_rq_map_integrity_sg(struct request_queue
*q
,
1434 struct scatterlist
*s
)
1438 static inline struct blk_integrity
*bdev_get_integrity(struct block_device
*b
)
1442 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1446 static inline int blk_integrity_compare(struct gendisk
*a
, struct gendisk
*b
)
1450 static inline int blk_integrity_register(struct gendisk
*d
,
1451 struct blk_integrity
*b
)
1455 static inline void blk_integrity_unregister(struct gendisk
*d
)
1458 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1462 static inline unsigned short queue_max_integrity_segments(struct request_queue
*q
)
1466 static inline int blk_integrity_merge_rq(struct request_queue
*rq
,
1472 static inline int blk_integrity_merge_bio(struct request_queue
*rq
,
1478 static inline bool blk_integrity_is_initialized(struct gendisk
*g
)
1483 #endif /* CONFIG_BLK_DEV_INTEGRITY */
1485 struct block_device_operations
{
1486 int (*open
) (struct block_device
*, fmode_t
);
1487 int (*release
) (struct gendisk
*, fmode_t
);
1488 int (*ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1489 int (*compat_ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1490 int (*direct_access
) (struct block_device
*, sector_t
,
1491 void **, unsigned long *);
1492 unsigned int (*check_events
) (struct gendisk
*disk
,
1493 unsigned int clearing
);
1494 /* ->media_changed() is DEPRECATED, use ->check_events() instead */
1495 int (*media_changed
) (struct gendisk
*);
1496 void (*unlock_native_capacity
) (struct gendisk
*);
1497 int (*revalidate_disk
) (struct gendisk
*);
1498 int (*getgeo
)(struct block_device
*, struct hd_geometry
*);
1499 /* this callback is with swap_lock and sometimes page table lock held */
1500 void (*swap_slot_free_notify
) (struct block_device
*, unsigned long);
1501 struct module
*owner
;
1504 extern int __blkdev_driver_ioctl(struct block_device
*, fmode_t
, unsigned int,
1506 #else /* CONFIG_BLOCK */
1508 * stubs for when the block layer is configured out
1510 #define buffer_heads_over_limit 0
1512 static inline long nr_blockdev_pages(void)
1520 static inline void blk_start_plug(struct blk_plug
*plug
)
1524 static inline void blk_finish_plug(struct blk_plug
*plug
)
1528 static inline void blk_flush_plug(struct task_struct
*task
)
1532 static inline void blk_schedule_flush_plug(struct task_struct
*task
)
1537 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1542 #endif /* CONFIG_BLOCK */