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.
94 * if you modify this structure, be sure to check block/blk-core.c:blk_rq_init()
99 struct list_head queuelist
;
100 struct llist_node ll_list
;
103 struct call_single_data csd
;
104 struct work_struct mq_flush_data
;
107 struct request_queue
*q
;
108 struct blk_mq_ctx
*mq_ctx
;
111 enum rq_cmd_type_bits cmd_type
;
112 unsigned long atomic_flags
;
116 /* the following two fields are internal, NEVER access directly */
117 unsigned int __data_len
; /* total data len */
118 sector_t __sector
; /* sector cursor */
123 struct hlist_node hash
; /* merge hash */
125 * The rb_node is only used inside the io scheduler, requests
126 * are pruned when moved to the dispatch queue. So let the
127 * completion_data share space with the rb_node.
130 struct rb_node rb_node
; /* sort/lookup */
131 void *completion_data
;
135 * Three pointers are available for the IO schedulers, if they need
136 * more they have to dynamically allocate it. Flush requests are
137 * never put on the IO scheduler. So let the flush fields share
138 * space with the elevator data.
148 struct list_head list
;
149 rq_end_io_fn
*saved_end_io
;
153 struct gendisk
*rq_disk
;
154 struct hd_struct
*part
;
155 unsigned long start_time
;
156 #ifdef CONFIG_BLK_CGROUP
157 struct request_list
*rl
; /* rl this rq is alloced from */
158 unsigned long long start_time_ns
;
159 unsigned long long io_start_time_ns
; /* when passed to hardware */
161 /* Number of scatter-gather DMA addr+len pairs after
162 * physical address coalescing is performed.
164 unsigned short nr_phys_segments
;
165 #if defined(CONFIG_BLK_DEV_INTEGRITY)
166 unsigned short nr_integrity_segments
;
169 unsigned short ioprio
;
171 void *special
; /* opaque pointer available for LLD use */
172 char *buffer
; /* kaddr of the current segment if available */
178 * when request is used as a packet command carrier
180 unsigned char __cmd
[BLK_MAX_CDB
];
182 unsigned short cmd_len
;
184 unsigned int extra_len
; /* length of alignment and padding */
185 unsigned int sense_len
;
186 unsigned int resid_len
; /* residual count */
189 unsigned long deadline
;
190 struct list_head timeout_list
;
191 unsigned int timeout
;
195 * completion callback.
197 rq_end_io_fn
*end_io
;
201 struct request
*next_rq
;
204 static inline unsigned short req_get_ioprio(struct request
*req
)
210 * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME
211 * requests. Some step values could eventually be made generic.
213 struct request_pm_state
215 /* PM state machine step value, currently driver specific */
217 /* requested PM state value (S1, S2, S3, S4, ...) */
219 void* data
; /* for driver use */
222 #include <linux/elevator.h>
224 struct blk_queue_ctx
;
226 typedef void (request_fn_proc
) (struct request_queue
*q
);
227 typedef void (make_request_fn
) (struct request_queue
*q
, struct bio
*bio
);
228 typedef int (prep_rq_fn
) (struct request_queue
*, struct request
*);
229 typedef void (unprep_rq_fn
) (struct request_queue
*, struct request
*);
232 struct bvec_merge_data
{
233 struct block_device
*bi_bdev
;
238 typedef int (merge_bvec_fn
) (struct request_queue
*, struct bvec_merge_data
*,
240 typedef void (softirq_done_fn
)(struct request
*);
241 typedef int (dma_drain_needed_fn
)(struct request
*);
242 typedef int (lld_busy_fn
) (struct request_queue
*q
);
243 typedef int (bsg_job_fn
) (struct bsg_job
*);
245 enum blk_eh_timer_return
{
251 typedef enum blk_eh_timer_return (rq_timed_out_fn
)(struct request
*);
253 enum blk_queue_state
{
258 struct blk_queue_tag
{
259 struct request
**tag_index
; /* map of busy tags */
260 unsigned long *tag_map
; /* bit map of free/busy tags */
261 int busy
; /* current depth */
262 int max_depth
; /* what we will send to device */
263 int real_max_depth
; /* what the array can hold */
264 atomic_t refcnt
; /* map can be shared */
267 #define BLK_SCSI_MAX_CMDS (256)
268 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
270 struct queue_limits
{
271 unsigned long bounce_pfn
;
272 unsigned long seg_boundary_mask
;
274 unsigned int max_hw_sectors
;
275 unsigned int max_sectors
;
276 unsigned int max_segment_size
;
277 unsigned int physical_block_size
;
278 unsigned int alignment_offset
;
281 unsigned int max_discard_sectors
;
282 unsigned int max_write_same_sectors
;
283 unsigned int discard_granularity
;
284 unsigned int discard_alignment
;
286 unsigned short logical_block_size
;
287 unsigned short max_segments
;
288 unsigned short max_integrity_segments
;
290 unsigned char misaligned
;
291 unsigned char discard_misaligned
;
292 unsigned char cluster
;
293 unsigned char discard_zeroes_data
;
296 struct request_queue
{
298 * Together with queue_head for cacheline sharing
300 struct list_head queue_head
;
301 struct request
*last_merge
;
302 struct elevator_queue
*elevator
;
303 int nr_rqs
[2]; /* # allocated [a]sync rqs */
304 int nr_rqs_elvpriv
; /* # allocated rqs w/ elvpriv */
307 * If blkcg is not used, @q->root_rl serves all requests. If blkcg
308 * is used, root blkg allocates from @q->root_rl and all other
309 * blkgs from their own blkg->rl. Which one to use should be
310 * determined using bio_request_list().
312 struct request_list root_rl
;
314 request_fn_proc
*request_fn
;
315 make_request_fn
*make_request_fn
;
316 prep_rq_fn
*prep_rq_fn
;
317 unprep_rq_fn
*unprep_rq_fn
;
318 merge_bvec_fn
*merge_bvec_fn
;
319 softirq_done_fn
*softirq_done_fn
;
320 rq_timed_out_fn
*rq_timed_out_fn
;
321 dma_drain_needed_fn
*dma_drain_needed
;
322 lld_busy_fn
*lld_busy_fn
;
324 struct blk_mq_ops
*mq_ops
;
326 unsigned int *mq_map
;
329 struct blk_mq_ctx
*queue_ctx
;
330 unsigned int nr_queues
;
332 /* hw dispatch queues */
333 struct blk_mq_hw_ctx
**queue_hw_ctx
;
334 unsigned int nr_hw_queues
;
337 * Dispatch queue sorting
340 struct request
*boundary_rq
;
343 * Delayed queue handling
345 struct delayed_work delay_work
;
347 struct backing_dev_info backing_dev_info
;
350 * The queue owner gets to use this for whatever they like.
351 * ll_rw_blk doesn't touch it.
356 * various queue flags, see QUEUE_* below
358 unsigned long queue_flags
;
361 * ida allocated id for this queue. Used to index queues from
367 * queue needs bounce pages for pages above this limit
372 * protects queue structures from reentrancy. ->__queue_lock should
373 * _never_ be used directly, it is queue private. always use
376 spinlock_t __queue_lock
;
377 spinlock_t
*queue_lock
;
387 struct kobject mq_kobj
;
389 #ifdef CONFIG_PM_RUNTIME
392 unsigned int nr_pending
;
398 unsigned long nr_requests
; /* Max # of requests */
399 unsigned int nr_congestion_on
;
400 unsigned int nr_congestion_off
;
401 unsigned int nr_batching
;
403 unsigned int dma_drain_size
;
404 void *dma_drain_buffer
;
405 unsigned int dma_pad_mask
;
406 unsigned int dma_alignment
;
408 struct blk_queue_tag
*queue_tags
;
409 struct list_head tag_busy_list
;
411 unsigned int nr_sorted
;
412 unsigned int in_flight
[2];
414 * Number of active block driver functions for which blk_drain_queue()
415 * must wait. Must be incremented around functions that unlock the
416 * queue_lock internally, e.g. scsi_request_fn().
418 unsigned int request_fn_active
;
420 unsigned int rq_timeout
;
421 struct timer_list timeout
;
422 struct list_head timeout_list
;
424 struct list_head icq_list
;
425 #ifdef CONFIG_BLK_CGROUP
426 DECLARE_BITMAP (blkcg_pols
, BLKCG_MAX_POLS
);
427 struct blkcg_gq
*root_blkg
;
428 struct list_head blkg_list
;
431 struct queue_limits limits
;
436 unsigned int sg_timeout
;
437 unsigned int sg_reserved_size
;
439 #ifdef CONFIG_BLK_DEV_IO_TRACE
440 struct blk_trace
*blk_trace
;
443 * for flush operations
445 unsigned int flush_flags
;
446 unsigned int flush_not_queueable
:1;
447 unsigned int flush_queue_delayed
:1;
448 unsigned int flush_pending_idx
:1;
449 unsigned int flush_running_idx
:1;
450 unsigned long flush_pending_since
;
451 struct list_head flush_queue
[2];
452 struct list_head flush_data_in_flight
;
454 struct request flush_rq
;
456 spinlock_t mq_flush_lock
;
457 struct work_struct mq_flush_work
;
461 struct mutex sysfs_lock
;
465 #if defined(CONFIG_BLK_DEV_BSG)
466 bsg_job_fn
*bsg_job_fn
;
468 struct bsg_class_device bsg_dev
;
471 #ifdef CONFIG_BLK_DEV_THROTTLING
473 struct throtl_data
*td
;
475 struct rcu_head rcu_head
;
476 wait_queue_head_t mq_freeze_wq
;
477 struct percpu_counter mq_usage_counter
;
478 struct list_head all_q_node
;
481 #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */
482 #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */
483 #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */
484 #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */
485 #define QUEUE_FLAG_DYING 5 /* queue being torn down */
486 #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */
487 #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */
488 #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */
489 #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */
490 #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */
491 #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */
492 #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */
493 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
494 #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */
495 #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */
496 #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */
497 #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */
498 #define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */
499 #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */
500 #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */
501 #define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */
503 #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
504 (1 << QUEUE_FLAG_STACKABLE) | \
505 (1 << QUEUE_FLAG_SAME_COMP) | \
506 (1 << QUEUE_FLAG_ADD_RANDOM))
508 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
509 (1 << QUEUE_FLAG_SAME_COMP))
511 static inline void queue_lockdep_assert_held(struct request_queue
*q
)
514 lockdep_assert_held(q
->queue_lock
);
517 static inline void queue_flag_set_unlocked(unsigned int flag
,
518 struct request_queue
*q
)
520 __set_bit(flag
, &q
->queue_flags
);
523 static inline int queue_flag_test_and_clear(unsigned int flag
,
524 struct request_queue
*q
)
526 queue_lockdep_assert_held(q
);
528 if (test_bit(flag
, &q
->queue_flags
)) {
529 __clear_bit(flag
, &q
->queue_flags
);
536 static inline int queue_flag_test_and_set(unsigned int flag
,
537 struct request_queue
*q
)
539 queue_lockdep_assert_held(q
);
541 if (!test_bit(flag
, &q
->queue_flags
)) {
542 __set_bit(flag
, &q
->queue_flags
);
549 static inline void queue_flag_set(unsigned int flag
, struct request_queue
*q
)
551 queue_lockdep_assert_held(q
);
552 __set_bit(flag
, &q
->queue_flags
);
555 static inline void queue_flag_clear_unlocked(unsigned int flag
,
556 struct request_queue
*q
)
558 __clear_bit(flag
, &q
->queue_flags
);
561 static inline int queue_in_flight(struct request_queue
*q
)
563 return q
->in_flight
[0] + q
->in_flight
[1];
566 static inline void queue_flag_clear(unsigned int flag
, struct request_queue
*q
)
568 queue_lockdep_assert_held(q
);
569 __clear_bit(flag
, &q
->queue_flags
);
572 #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
573 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
574 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
575 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
576 #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags)
577 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
578 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
579 #define blk_queue_noxmerges(q) \
580 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
581 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
582 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
583 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
584 #define blk_queue_stackable(q) \
585 test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
586 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
587 #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \
588 test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags))
590 #define blk_noretry_request(rq) \
591 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
592 REQ_FAILFAST_DRIVER))
594 #define blk_account_rq(rq) \
595 (((rq)->cmd_flags & REQ_STARTED) && \
596 ((rq)->cmd_type == REQ_TYPE_FS))
598 #define blk_pm_request(rq) \
599 ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \
600 (rq)->cmd_type == REQ_TYPE_PM_RESUME)
602 #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
603 #define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
604 /* rq->queuelist of dequeued request must be list_empty() */
605 #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
607 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
609 #define rq_data_dir(rq) (((rq)->cmd_flags & 1) != 0)
611 static inline unsigned int blk_queue_cluster(struct request_queue
*q
)
613 return q
->limits
.cluster
;
617 * We regard a request as sync, if either a read or a sync write
619 static inline bool rw_is_sync(unsigned int rw_flags
)
621 return !(rw_flags
& REQ_WRITE
) || (rw_flags
& REQ_SYNC
);
624 static inline bool rq_is_sync(struct request
*rq
)
626 return rw_is_sync(rq
->cmd_flags
);
629 static inline bool blk_rl_full(struct request_list
*rl
, bool sync
)
631 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
633 return rl
->flags
& flag
;
636 static inline void blk_set_rl_full(struct request_list
*rl
, bool sync
)
638 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
643 static inline void blk_clear_rl_full(struct request_list
*rl
, bool sync
)
645 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
650 static inline bool rq_mergeable(struct request
*rq
)
652 if (rq
->cmd_type
!= REQ_TYPE_FS
)
655 if (rq
->cmd_flags
& REQ_NOMERGE_FLAGS
)
661 static inline bool blk_check_merge_flags(unsigned int flags1
,
664 if ((flags1
& REQ_DISCARD
) != (flags2
& REQ_DISCARD
))
667 if ((flags1
& REQ_SECURE
) != (flags2
& REQ_SECURE
))
670 if ((flags1
& REQ_WRITE_SAME
) != (flags2
& REQ_WRITE_SAME
))
676 static inline bool blk_write_same_mergeable(struct bio
*a
, struct bio
*b
)
678 if (bio_data(a
) == bio_data(b
))
685 * q->prep_rq_fn return values
687 #define BLKPREP_OK 0 /* serve it */
688 #define BLKPREP_KILL 1 /* fatal error, kill */
689 #define BLKPREP_DEFER 2 /* leave on queue */
691 extern unsigned long blk_max_low_pfn
, blk_max_pfn
;
694 * standard bounce addresses:
696 * BLK_BOUNCE_HIGH : bounce all highmem pages
697 * BLK_BOUNCE_ANY : don't bounce anything
698 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
701 #if BITS_PER_LONG == 32
702 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
704 #define BLK_BOUNCE_HIGH -1ULL
706 #define BLK_BOUNCE_ANY (-1ULL)
707 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
710 * default timeout for SG_IO if none specified
712 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
713 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
716 extern int init_emergency_isa_pool(void);
717 extern void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
);
719 static inline int init_emergency_isa_pool(void)
723 static inline void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
)
726 #endif /* CONFIG_MMU */
732 unsigned long offset
;
737 struct req_iterator
{
738 struct bvec_iter iter
;
742 /* This should not be used directly - use rq_for_each_segment */
743 #define for_each_bio(_bio) \
744 for (; _bio; _bio = _bio->bi_next)
745 #define __rq_for_each_bio(_bio, rq) \
747 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
749 #define rq_for_each_segment(bvl, _rq, _iter) \
750 __rq_for_each_bio(_iter.bio, _rq) \
751 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
753 #define rq_iter_last(bvec, _iter) \
754 (_iter.bio->bi_next == NULL && \
755 bio_iter_last(bvec, _iter.iter))
757 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
758 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
760 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
761 extern void rq_flush_dcache_pages(struct request
*rq
);
763 static inline void rq_flush_dcache_pages(struct request
*rq
)
768 extern int blk_register_queue(struct gendisk
*disk
);
769 extern void blk_unregister_queue(struct gendisk
*disk
);
770 extern void generic_make_request(struct bio
*bio
);
771 extern void blk_rq_init(struct request_queue
*q
, struct request
*rq
);
772 extern void blk_put_request(struct request
*);
773 extern void __blk_put_request(struct request_queue
*, struct request
*);
774 extern struct request
*blk_get_request(struct request_queue
*, int, gfp_t
);
775 extern struct request
*blk_make_request(struct request_queue
*, struct bio
*,
777 extern void blk_requeue_request(struct request_queue
*, struct request
*);
778 extern void blk_add_request_payload(struct request
*rq
, struct page
*page
,
780 extern int blk_rq_check_limits(struct request_queue
*q
, struct request
*rq
);
781 extern int blk_lld_busy(struct request_queue
*q
);
782 extern int blk_rq_prep_clone(struct request
*rq
, struct request
*rq_src
,
783 struct bio_set
*bs
, gfp_t gfp_mask
,
784 int (*bio_ctr
)(struct bio
*, struct bio
*, void *),
786 extern void blk_rq_unprep_clone(struct request
*rq
);
787 extern int blk_insert_cloned_request(struct request_queue
*q
,
789 extern void blk_delay_queue(struct request_queue
*, unsigned long);
790 extern void blk_recount_segments(struct request_queue
*, struct bio
*);
791 extern int scsi_verify_blk_ioctl(struct block_device
*, unsigned int);
792 extern int scsi_cmd_blk_ioctl(struct block_device
*, fmode_t
,
793 unsigned int, void __user
*);
794 extern int scsi_cmd_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
795 unsigned int, void __user
*);
796 extern int sg_scsi_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
797 struct scsi_ioctl_command __user
*);
799 extern void blk_queue_bio(struct request_queue
*q
, struct bio
*bio
);
802 * A queue has just exitted congestion. Note this in the global counter of
803 * congested queues, and wake up anyone who was waiting for requests to be
806 static inline void blk_clear_queue_congested(struct request_queue
*q
, int sync
)
808 clear_bdi_congested(&q
->backing_dev_info
, sync
);
812 * A queue has just entered congestion. Flag that in the queue's VM-visible
813 * state flags and increment the global gounter of congested queues.
815 static inline void blk_set_queue_congested(struct request_queue
*q
, int sync
)
817 set_bdi_congested(&q
->backing_dev_info
, sync
);
820 extern void blk_start_queue(struct request_queue
*q
);
821 extern void blk_stop_queue(struct request_queue
*q
);
822 extern void blk_sync_queue(struct request_queue
*q
);
823 extern void __blk_stop_queue(struct request_queue
*q
);
824 extern void __blk_run_queue(struct request_queue
*q
);
825 extern void blk_run_queue(struct request_queue
*);
826 extern void blk_run_queue_async(struct request_queue
*q
);
827 extern int blk_rq_map_user(struct request_queue
*, struct request
*,
828 struct rq_map_data
*, void __user
*, unsigned long,
830 extern int blk_rq_unmap_user(struct bio
*);
831 extern int blk_rq_map_kern(struct request_queue
*, struct request
*, void *, unsigned int, gfp_t
);
832 extern int blk_rq_map_user_iov(struct request_queue
*, struct request
*,
833 struct rq_map_data
*, struct sg_iovec
*, int,
834 unsigned int, gfp_t
);
835 extern int blk_execute_rq(struct request_queue
*, struct gendisk
*,
836 struct request
*, int);
837 extern void blk_execute_rq_nowait(struct request_queue
*, struct gendisk
*,
838 struct request
*, int, rq_end_io_fn
*);
840 static inline struct request_queue
*bdev_get_queue(struct block_device
*bdev
)
842 return bdev
->bd_disk
->queue
;
846 * blk_rq_pos() : the current sector
847 * blk_rq_bytes() : bytes left in the entire request
848 * blk_rq_cur_bytes() : bytes left in the current segment
849 * blk_rq_err_bytes() : bytes left till the next error boundary
850 * blk_rq_sectors() : sectors left in the entire request
851 * blk_rq_cur_sectors() : sectors left in the current segment
853 static inline sector_t
blk_rq_pos(const struct request
*rq
)
858 static inline unsigned int blk_rq_bytes(const struct request
*rq
)
860 return rq
->__data_len
;
863 static inline int blk_rq_cur_bytes(const struct request
*rq
)
865 return rq
->bio
? bio_cur_bytes(rq
->bio
) : 0;
868 extern unsigned int blk_rq_err_bytes(const struct request
*rq
);
870 static inline unsigned int blk_rq_sectors(const struct request
*rq
)
872 return blk_rq_bytes(rq
) >> 9;
875 static inline unsigned int blk_rq_cur_sectors(const struct request
*rq
)
877 return blk_rq_cur_bytes(rq
) >> 9;
880 static inline unsigned int blk_queue_get_max_sectors(struct request_queue
*q
,
881 unsigned int cmd_flags
)
883 if (unlikely(cmd_flags
& REQ_DISCARD
))
884 return min(q
->limits
.max_discard_sectors
, UINT_MAX
>> 9);
886 if (unlikely(cmd_flags
& REQ_WRITE_SAME
))
887 return q
->limits
.max_write_same_sectors
;
889 return q
->limits
.max_sectors
;
892 static inline unsigned int blk_rq_get_max_sectors(struct request
*rq
)
894 struct request_queue
*q
= rq
->q
;
896 if (unlikely(rq
->cmd_type
== REQ_TYPE_BLOCK_PC
))
897 return q
->limits
.max_hw_sectors
;
899 return blk_queue_get_max_sectors(q
, rq
->cmd_flags
);
902 static inline unsigned int blk_rq_count_bios(struct request
*rq
)
904 unsigned int nr_bios
= 0;
907 __rq_for_each_bio(bio
, rq
)
914 * Request issue related functions.
916 extern struct request
*blk_peek_request(struct request_queue
*q
);
917 extern void blk_start_request(struct request
*rq
);
918 extern struct request
*blk_fetch_request(struct request_queue
*q
);
921 * Request completion related functions.
923 * blk_update_request() completes given number of bytes and updates
924 * the request without completing it.
926 * blk_end_request() and friends. __blk_end_request() must be called
927 * with the request queue spinlock acquired.
929 * Several drivers define their own end_request and call
930 * blk_end_request() for parts of the original function.
931 * This prevents code duplication in drivers.
933 extern bool blk_update_request(struct request
*rq
, int error
,
934 unsigned int nr_bytes
);
935 extern bool blk_end_request(struct request
*rq
, int error
,
936 unsigned int nr_bytes
);
937 extern void blk_end_request_all(struct request
*rq
, int error
);
938 extern bool blk_end_request_cur(struct request
*rq
, int error
);
939 extern bool blk_end_request_err(struct request
*rq
, int error
);
940 extern bool __blk_end_request(struct request
*rq
, int error
,
941 unsigned int nr_bytes
);
942 extern void __blk_end_request_all(struct request
*rq
, int error
);
943 extern bool __blk_end_request_cur(struct request
*rq
, int error
);
944 extern bool __blk_end_request_err(struct request
*rq
, int error
);
946 extern void blk_complete_request(struct request
*);
947 extern void __blk_complete_request(struct request
*);
948 extern void blk_abort_request(struct request
*);
949 extern void blk_unprep_request(struct request
*);
952 * Access functions for manipulating queue properties
954 extern struct request_queue
*blk_init_queue_node(request_fn_proc
*rfn
,
955 spinlock_t
*lock
, int node_id
);
956 extern struct request_queue
*blk_init_queue(request_fn_proc
*, spinlock_t
*);
957 extern struct request_queue
*blk_init_allocated_queue(struct request_queue
*,
958 request_fn_proc
*, spinlock_t
*);
959 extern void blk_cleanup_queue(struct request_queue
*);
960 extern void blk_queue_make_request(struct request_queue
*, make_request_fn
*);
961 extern void blk_queue_bounce_limit(struct request_queue
*, u64
);
962 extern void blk_limits_max_hw_sectors(struct queue_limits
*, unsigned int);
963 extern void blk_queue_max_hw_sectors(struct request_queue
*, unsigned int);
964 extern void blk_queue_max_segments(struct request_queue
*, unsigned short);
965 extern void blk_queue_max_segment_size(struct request_queue
*, unsigned int);
966 extern void blk_queue_max_discard_sectors(struct request_queue
*q
,
967 unsigned int max_discard_sectors
);
968 extern void blk_queue_max_write_same_sectors(struct request_queue
*q
,
969 unsigned int max_write_same_sectors
);
970 extern void blk_queue_logical_block_size(struct request_queue
*, unsigned short);
971 extern void blk_queue_physical_block_size(struct request_queue
*, unsigned int);
972 extern void blk_queue_alignment_offset(struct request_queue
*q
,
973 unsigned int alignment
);
974 extern void blk_limits_io_min(struct queue_limits
*limits
, unsigned int min
);
975 extern void blk_queue_io_min(struct request_queue
*q
, unsigned int min
);
976 extern void blk_limits_io_opt(struct queue_limits
*limits
, unsigned int opt
);
977 extern void blk_queue_io_opt(struct request_queue
*q
, unsigned int opt
);
978 extern void blk_set_default_limits(struct queue_limits
*lim
);
979 extern void blk_set_stacking_limits(struct queue_limits
*lim
);
980 extern int blk_stack_limits(struct queue_limits
*t
, struct queue_limits
*b
,
982 extern int bdev_stack_limits(struct queue_limits
*t
, struct block_device
*bdev
,
984 extern void disk_stack_limits(struct gendisk
*disk
, struct block_device
*bdev
,
986 extern void blk_queue_stack_limits(struct request_queue
*t
, struct request_queue
*b
);
987 extern void blk_queue_dma_pad(struct request_queue
*, unsigned int);
988 extern void blk_queue_update_dma_pad(struct request_queue
*, unsigned int);
989 extern int blk_queue_dma_drain(struct request_queue
*q
,
990 dma_drain_needed_fn
*dma_drain_needed
,
991 void *buf
, unsigned int size
);
992 extern void blk_queue_lld_busy(struct request_queue
*q
, lld_busy_fn
*fn
);
993 extern void blk_queue_segment_boundary(struct request_queue
*, unsigned long);
994 extern void blk_queue_prep_rq(struct request_queue
*, prep_rq_fn
*pfn
);
995 extern void blk_queue_unprep_rq(struct request_queue
*, unprep_rq_fn
*ufn
);
996 extern void blk_queue_merge_bvec(struct request_queue
*, merge_bvec_fn
*);
997 extern void blk_queue_dma_alignment(struct request_queue
*, int);
998 extern void blk_queue_update_dma_alignment(struct request_queue
*, int);
999 extern void blk_queue_softirq_done(struct request_queue
*, softirq_done_fn
*);
1000 extern void blk_queue_rq_timed_out(struct request_queue
*, rq_timed_out_fn
*);
1001 extern void blk_queue_rq_timeout(struct request_queue
*, unsigned int);
1002 extern void blk_queue_flush(struct request_queue
*q
, unsigned int flush
);
1003 extern void blk_queue_flush_queueable(struct request_queue
*q
, bool queueable
);
1004 extern struct backing_dev_info
*blk_get_backing_dev_info(struct block_device
*bdev
);
1006 extern int blk_rq_map_sg(struct request_queue
*, struct request
*, struct scatterlist
*);
1007 extern int blk_bio_map_sg(struct request_queue
*q
, struct bio
*bio
,
1008 struct scatterlist
*sglist
);
1009 extern void blk_dump_rq_flags(struct request
*, char *);
1010 extern long nr_blockdev_pages(void);
1012 bool __must_check
blk_get_queue(struct request_queue
*);
1013 struct request_queue
*blk_alloc_queue(gfp_t
);
1014 struct request_queue
*blk_alloc_queue_node(gfp_t
, int);
1015 extern void blk_put_queue(struct request_queue
*);
1018 * block layer runtime pm functions
1020 #ifdef CONFIG_PM_RUNTIME
1021 extern void blk_pm_runtime_init(struct request_queue
*q
, struct device
*dev
);
1022 extern int blk_pre_runtime_suspend(struct request_queue
*q
);
1023 extern void blk_post_runtime_suspend(struct request_queue
*q
, int err
);
1024 extern void blk_pre_runtime_resume(struct request_queue
*q
);
1025 extern void blk_post_runtime_resume(struct request_queue
*q
, int err
);
1027 static inline void blk_pm_runtime_init(struct request_queue
*q
,
1028 struct device
*dev
) {}
1029 static inline int blk_pre_runtime_suspend(struct request_queue
*q
)
1033 static inline void blk_post_runtime_suspend(struct request_queue
*q
, int err
) {}
1034 static inline void blk_pre_runtime_resume(struct request_queue
*q
) {}
1035 static inline void blk_post_runtime_resume(struct request_queue
*q
, int err
) {}
1039 * blk_plug permits building a queue of related requests by holding the I/O
1040 * fragments for a short period. This allows merging of sequential requests
1041 * into single larger request. As the requests are moved from a per-task list to
1042 * the device's request_queue in a batch, this results in improved scalability
1043 * as the lock contention for request_queue lock is reduced.
1045 * It is ok not to disable preemption when adding the request to the plug list
1046 * or when attempting a merge, because blk_schedule_flush_list() will only flush
1047 * the plug list when the task sleeps by itself. For details, please see
1048 * schedule() where blk_schedule_flush_plug() is called.
1051 unsigned long magic
; /* detect uninitialized use-cases */
1052 struct list_head list
; /* requests */
1053 struct list_head mq_list
; /* blk-mq requests */
1054 struct list_head cb_list
; /* md requires an unplug callback */
1056 #define BLK_MAX_REQUEST_COUNT 16
1059 typedef void (*blk_plug_cb_fn
)(struct blk_plug_cb
*, bool);
1060 struct blk_plug_cb
{
1061 struct list_head list
;
1062 blk_plug_cb_fn callback
;
1065 extern struct blk_plug_cb
*blk_check_plugged(blk_plug_cb_fn unplug
,
1066 void *data
, int size
);
1067 extern void blk_start_plug(struct blk_plug
*);
1068 extern void blk_finish_plug(struct blk_plug
*);
1069 extern void blk_flush_plug_list(struct blk_plug
*, bool);
1071 static inline void blk_flush_plug(struct task_struct
*tsk
)
1073 struct blk_plug
*plug
= tsk
->plug
;
1076 blk_flush_plug_list(plug
, false);
1079 static inline void blk_schedule_flush_plug(struct task_struct
*tsk
)
1081 struct blk_plug
*plug
= tsk
->plug
;
1084 blk_flush_plug_list(plug
, true);
1087 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1089 struct blk_plug
*plug
= tsk
->plug
;
1092 (!list_empty(&plug
->list
) ||
1093 !list_empty(&plug
->mq_list
) ||
1094 !list_empty(&plug
->cb_list
));
1100 #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED)
1101 extern int blk_queue_start_tag(struct request_queue
*, struct request
*);
1102 extern struct request
*blk_queue_find_tag(struct request_queue
*, int);
1103 extern void blk_queue_end_tag(struct request_queue
*, struct request
*);
1104 extern int blk_queue_init_tags(struct request_queue
*, int, struct blk_queue_tag
*);
1105 extern void blk_queue_free_tags(struct request_queue
*);
1106 extern int blk_queue_resize_tags(struct request_queue
*, int);
1107 extern void blk_queue_invalidate_tags(struct request_queue
*);
1108 extern struct blk_queue_tag
*blk_init_tags(int);
1109 extern void blk_free_tags(struct blk_queue_tag
*);
1111 static inline struct request
*blk_map_queue_find_tag(struct blk_queue_tag
*bqt
,
1114 if (unlikely(bqt
== NULL
|| tag
>= bqt
->real_max_depth
))
1116 return bqt
->tag_index
[tag
];
1119 #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */
1121 extern int blkdev_issue_flush(struct block_device
*, gfp_t
, sector_t
*);
1122 extern int blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1123 sector_t nr_sects
, gfp_t gfp_mask
, unsigned long flags
);
1124 extern int blkdev_issue_write_same(struct block_device
*bdev
, sector_t sector
,
1125 sector_t nr_sects
, gfp_t gfp_mask
, struct page
*page
);
1126 extern int blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1127 sector_t nr_sects
, gfp_t gfp_mask
);
1128 static inline int sb_issue_discard(struct super_block
*sb
, sector_t block
,
1129 sector_t nr_blocks
, gfp_t gfp_mask
, unsigned long flags
)
1131 return blkdev_issue_discard(sb
->s_bdev
, block
<< (sb
->s_blocksize_bits
- 9),
1132 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1135 static inline int sb_issue_zeroout(struct super_block
*sb
, sector_t block
,
1136 sector_t nr_blocks
, gfp_t gfp_mask
)
1138 return blkdev_issue_zeroout(sb
->s_bdev
,
1139 block
<< (sb
->s_blocksize_bits
- 9),
1140 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1144 extern int blk_verify_command(unsigned char *cmd
, fmode_t has_write_perm
);
1146 enum blk_default_limits
{
1147 BLK_MAX_SEGMENTS
= 128,
1148 BLK_SAFE_MAX_SECTORS
= 255,
1149 BLK_DEF_MAX_SECTORS
= 1024,
1150 BLK_MAX_SEGMENT_SIZE
= 65536,
1151 BLK_SEG_BOUNDARY_MASK
= 0xFFFFFFFFUL
,
1154 #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
1156 static inline unsigned long queue_bounce_pfn(struct request_queue
*q
)
1158 return q
->limits
.bounce_pfn
;
1161 static inline unsigned long queue_segment_boundary(struct request_queue
*q
)
1163 return q
->limits
.seg_boundary_mask
;
1166 static inline unsigned int queue_max_sectors(struct request_queue
*q
)
1168 return q
->limits
.max_sectors
;
1171 static inline unsigned int queue_max_hw_sectors(struct request_queue
*q
)
1173 return q
->limits
.max_hw_sectors
;
1176 static inline unsigned short queue_max_segments(struct request_queue
*q
)
1178 return q
->limits
.max_segments
;
1181 static inline unsigned int queue_max_segment_size(struct request_queue
*q
)
1183 return q
->limits
.max_segment_size
;
1186 static inline unsigned short queue_logical_block_size(struct request_queue
*q
)
1190 if (q
&& q
->limits
.logical_block_size
)
1191 retval
= q
->limits
.logical_block_size
;
1196 static inline unsigned short bdev_logical_block_size(struct block_device
*bdev
)
1198 return queue_logical_block_size(bdev_get_queue(bdev
));
1201 static inline unsigned int queue_physical_block_size(struct request_queue
*q
)
1203 return q
->limits
.physical_block_size
;
1206 static inline unsigned int bdev_physical_block_size(struct block_device
*bdev
)
1208 return queue_physical_block_size(bdev_get_queue(bdev
));
1211 static inline unsigned int queue_io_min(struct request_queue
*q
)
1213 return q
->limits
.io_min
;
1216 static inline int bdev_io_min(struct block_device
*bdev
)
1218 return queue_io_min(bdev_get_queue(bdev
));
1221 static inline unsigned int queue_io_opt(struct request_queue
*q
)
1223 return q
->limits
.io_opt
;
1226 static inline int bdev_io_opt(struct block_device
*bdev
)
1228 return queue_io_opt(bdev_get_queue(bdev
));
1231 static inline int queue_alignment_offset(struct request_queue
*q
)
1233 if (q
->limits
.misaligned
)
1236 return q
->limits
.alignment_offset
;
1239 static inline int queue_limit_alignment_offset(struct queue_limits
*lim
, sector_t sector
)
1241 unsigned int granularity
= max(lim
->physical_block_size
, lim
->io_min
);
1242 unsigned int alignment
= (sector
<< 9) & (granularity
- 1);
1244 return (granularity
+ lim
->alignment_offset
- alignment
)
1245 & (granularity
- 1);
1248 static inline int bdev_alignment_offset(struct block_device
*bdev
)
1250 struct request_queue
*q
= bdev_get_queue(bdev
);
1252 if (q
->limits
.misaligned
)
1255 if (bdev
!= bdev
->bd_contains
)
1256 return bdev
->bd_part
->alignment_offset
;
1258 return q
->limits
.alignment_offset
;
1261 static inline int queue_discard_alignment(struct request_queue
*q
)
1263 if (q
->limits
.discard_misaligned
)
1266 return q
->limits
.discard_alignment
;
1269 static inline int queue_limit_discard_alignment(struct queue_limits
*lim
, sector_t sector
)
1271 unsigned int alignment
, granularity
, offset
;
1273 if (!lim
->max_discard_sectors
)
1276 /* Why are these in bytes, not sectors? */
1277 alignment
= lim
->discard_alignment
>> 9;
1278 granularity
= lim
->discard_granularity
>> 9;
1282 /* Offset of the partition start in 'granularity' sectors */
1283 offset
= sector_div(sector
, granularity
);
1285 /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1286 offset
= (granularity
+ alignment
- offset
) % granularity
;
1288 /* Turn it back into bytes, gaah */
1292 static inline int bdev_discard_alignment(struct block_device
*bdev
)
1294 struct request_queue
*q
= bdev_get_queue(bdev
);
1296 if (bdev
!= bdev
->bd_contains
)
1297 return bdev
->bd_part
->discard_alignment
;
1299 return q
->limits
.discard_alignment
;
1302 static inline unsigned int queue_discard_zeroes_data(struct request_queue
*q
)
1304 if (q
->limits
.max_discard_sectors
&& q
->limits
.discard_zeroes_data
== 1)
1310 static inline unsigned int bdev_discard_zeroes_data(struct block_device
*bdev
)
1312 return queue_discard_zeroes_data(bdev_get_queue(bdev
));
1315 static inline unsigned int bdev_write_same(struct block_device
*bdev
)
1317 struct request_queue
*q
= bdev_get_queue(bdev
);
1320 return q
->limits
.max_write_same_sectors
;
1325 static inline int queue_dma_alignment(struct request_queue
*q
)
1327 return q
? q
->dma_alignment
: 511;
1330 static inline int blk_rq_aligned(struct request_queue
*q
, unsigned long addr
,
1333 unsigned int alignment
= queue_dma_alignment(q
) | q
->dma_pad_mask
;
1334 return !(addr
& alignment
) && !(len
& alignment
);
1337 /* assumes size > 256 */
1338 static inline unsigned int blksize_bits(unsigned int size
)
1340 unsigned int bits
= 8;
1344 } while (size
> 256);
1348 static inline unsigned int block_size(struct block_device
*bdev
)
1350 return bdev
->bd_block_size
;
1353 static inline bool queue_flush_queueable(struct request_queue
*q
)
1355 return !q
->flush_not_queueable
;
1358 typedef struct {struct page
*v
;} Sector
;
1360 unsigned char *read_dev_sector(struct block_device
*, sector_t
, Sector
*);
1362 static inline void put_dev_sector(Sector p
)
1364 page_cache_release(p
.v
);
1368 int kblockd_schedule_work(struct request_queue
*q
, struct work_struct
*work
);
1369 int kblockd_schedule_delayed_work(struct request_queue
*q
, struct delayed_work
*dwork
, unsigned long delay
);
1371 #ifdef CONFIG_BLK_CGROUP
1373 * This should not be using sched_clock(). A real patch is in progress
1374 * to fix this up, until that is in place we need to disable preemption
1375 * around sched_clock() in this function and set_io_start_time_ns().
1377 static inline void set_start_time_ns(struct request
*req
)
1380 req
->start_time_ns
= sched_clock();
1384 static inline void set_io_start_time_ns(struct request
*req
)
1387 req
->io_start_time_ns
= sched_clock();
1391 static inline uint64_t rq_start_time_ns(struct request
*req
)
1393 return req
->start_time_ns
;
1396 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1398 return req
->io_start_time_ns
;
1401 static inline void set_start_time_ns(struct request
*req
) {}
1402 static inline void set_io_start_time_ns(struct request
*req
) {}
1403 static inline uint64_t rq_start_time_ns(struct request
*req
)
1407 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1413 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1414 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1415 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1416 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1418 #if defined(CONFIG_BLK_DEV_INTEGRITY)
1420 #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */
1421 #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */
1423 struct blk_integrity_exchg
{
1427 unsigned int data_size
;
1428 unsigned short sector_size
;
1429 const char *disk_name
;
1432 typedef void (integrity_gen_fn
) (struct blk_integrity_exchg
*);
1433 typedef int (integrity_vrfy_fn
) (struct blk_integrity_exchg
*);
1434 typedef void (integrity_set_tag_fn
) (void *, void *, unsigned int);
1435 typedef void (integrity_get_tag_fn
) (void *, void *, unsigned int);
1437 struct blk_integrity
{
1438 integrity_gen_fn
*generate_fn
;
1439 integrity_vrfy_fn
*verify_fn
;
1440 integrity_set_tag_fn
*set_tag_fn
;
1441 integrity_get_tag_fn
*get_tag_fn
;
1443 unsigned short flags
;
1444 unsigned short tuple_size
;
1445 unsigned short sector_size
;
1446 unsigned short tag_size
;
1450 struct kobject kobj
;
1453 extern bool blk_integrity_is_initialized(struct gendisk
*);
1454 extern int blk_integrity_register(struct gendisk
*, struct blk_integrity
*);
1455 extern void blk_integrity_unregister(struct gendisk
*);
1456 extern int blk_integrity_compare(struct gendisk
*, struct gendisk
*);
1457 extern int blk_rq_map_integrity_sg(struct request_queue
*, struct bio
*,
1458 struct scatterlist
*);
1459 extern int blk_rq_count_integrity_sg(struct request_queue
*, struct bio
*);
1460 extern int blk_integrity_merge_rq(struct request_queue
*, struct request
*,
1462 extern int blk_integrity_merge_bio(struct request_queue
*, struct request
*,
1466 struct blk_integrity
*bdev_get_integrity(struct block_device
*bdev
)
1468 return bdev
->bd_disk
->integrity
;
1471 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1473 return disk
->integrity
;
1476 static inline int blk_integrity_rq(struct request
*rq
)
1478 if (rq
->bio
== NULL
)
1481 return bio_integrity(rq
->bio
);
1484 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1487 q
->limits
.max_integrity_segments
= segs
;
1490 static inline unsigned short
1491 queue_max_integrity_segments(struct request_queue
*q
)
1493 return q
->limits
.max_integrity_segments
;
1496 #else /* CONFIG_BLK_DEV_INTEGRITY */
1499 struct block_device
;
1501 struct blk_integrity
;
1503 static inline int blk_integrity_rq(struct request
*rq
)
1507 static inline int blk_rq_count_integrity_sg(struct request_queue
*q
,
1512 static inline int blk_rq_map_integrity_sg(struct request_queue
*q
,
1514 struct scatterlist
*s
)
1518 static inline struct blk_integrity
*bdev_get_integrity(struct block_device
*b
)
1522 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1526 static inline int blk_integrity_compare(struct gendisk
*a
, struct gendisk
*b
)
1530 static inline int blk_integrity_register(struct gendisk
*d
,
1531 struct blk_integrity
*b
)
1535 static inline void blk_integrity_unregister(struct gendisk
*d
)
1538 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1542 static inline unsigned short queue_max_integrity_segments(struct request_queue
*q
)
1546 static inline int blk_integrity_merge_rq(struct request_queue
*rq
,
1552 static inline int blk_integrity_merge_bio(struct request_queue
*rq
,
1558 static inline bool blk_integrity_is_initialized(struct gendisk
*g
)
1563 #endif /* CONFIG_BLK_DEV_INTEGRITY */
1565 struct block_device_operations
{
1566 int (*open
) (struct block_device
*, fmode_t
);
1567 void (*release
) (struct gendisk
*, fmode_t
);
1568 int (*ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1569 int (*compat_ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1570 int (*direct_access
) (struct block_device
*, sector_t
,
1571 void **, unsigned long *);
1572 unsigned int (*check_events
) (struct gendisk
*disk
,
1573 unsigned int clearing
);
1574 /* ->media_changed() is DEPRECATED, use ->check_events() instead */
1575 int (*media_changed
) (struct gendisk
*);
1576 void (*unlock_native_capacity
) (struct gendisk
*);
1577 int (*revalidate_disk
) (struct gendisk
*);
1578 int (*getgeo
)(struct block_device
*, struct hd_geometry
*);
1579 /* this callback is with swap_lock and sometimes page table lock held */
1580 void (*swap_slot_free_notify
) (struct block_device
*, unsigned long);
1581 struct module
*owner
;
1584 extern int __blkdev_driver_ioctl(struct block_device
*, fmode_t
, unsigned int,
1586 #else /* CONFIG_BLOCK */
1588 * stubs for when the block layer is configured out
1590 #define buffer_heads_over_limit 0
1592 static inline long nr_blockdev_pages(void)
1600 static inline void blk_start_plug(struct blk_plug
*plug
)
1604 static inline void blk_finish_plug(struct blk_plug
*plug
)
1608 static inline void blk_flush_plug(struct task_struct
*task
)
1612 static inline void blk_schedule_flush_plug(struct task_struct
*task
)
1617 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1622 #endif /* CONFIG_BLOCK */