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
{
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.i)
753 #define rq_iter_last(rq, _iter) \
754 (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1)
756 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
757 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
759 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
760 extern void rq_flush_dcache_pages(struct request
*rq
);
762 static inline void rq_flush_dcache_pages(struct request
*rq
)
767 extern int blk_register_queue(struct gendisk
*disk
);
768 extern void blk_unregister_queue(struct gendisk
*disk
);
769 extern void generic_make_request(struct bio
*bio
);
770 extern void blk_rq_init(struct request_queue
*q
, struct request
*rq
);
771 extern void blk_put_request(struct request
*);
772 extern void __blk_put_request(struct request_queue
*, struct request
*);
773 extern struct request
*blk_get_request(struct request_queue
*, int, gfp_t
);
774 extern struct request
*blk_make_request(struct request_queue
*, struct bio
*,
776 extern void blk_requeue_request(struct request_queue
*, struct request
*);
777 extern void blk_add_request_payload(struct request
*rq
, struct page
*page
,
779 extern int blk_rq_check_limits(struct request_queue
*q
, struct request
*rq
);
780 extern int blk_lld_busy(struct request_queue
*q
);
781 extern int blk_rq_prep_clone(struct request
*rq
, struct request
*rq_src
,
782 struct bio_set
*bs
, gfp_t gfp_mask
,
783 int (*bio_ctr
)(struct bio
*, struct bio
*, void *),
785 extern void blk_rq_unprep_clone(struct request
*rq
);
786 extern int blk_insert_cloned_request(struct request_queue
*q
,
788 extern void blk_delay_queue(struct request_queue
*, unsigned long);
789 extern void blk_recount_segments(struct request_queue
*, struct bio
*);
790 extern int scsi_verify_blk_ioctl(struct block_device
*, unsigned int);
791 extern int scsi_cmd_blk_ioctl(struct block_device
*, fmode_t
,
792 unsigned int, void __user
*);
793 extern int scsi_cmd_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
794 unsigned int, void __user
*);
795 extern int sg_scsi_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
796 struct scsi_ioctl_command __user
*);
798 extern void blk_queue_bio(struct request_queue
*q
, struct bio
*bio
);
801 * A queue has just exitted congestion. Note this in the global counter of
802 * congested queues, and wake up anyone who was waiting for requests to be
805 static inline void blk_clear_queue_congested(struct request_queue
*q
, int sync
)
807 clear_bdi_congested(&q
->backing_dev_info
, sync
);
811 * A queue has just entered congestion. Flag that in the queue's VM-visible
812 * state flags and increment the global gounter of congested queues.
814 static inline void blk_set_queue_congested(struct request_queue
*q
, int sync
)
816 set_bdi_congested(&q
->backing_dev_info
, sync
);
819 extern void blk_start_queue(struct request_queue
*q
);
820 extern void blk_stop_queue(struct request_queue
*q
);
821 extern void blk_sync_queue(struct request_queue
*q
);
822 extern void __blk_stop_queue(struct request_queue
*q
);
823 extern void __blk_run_queue(struct request_queue
*q
);
824 extern void blk_run_queue(struct request_queue
*);
825 extern void blk_run_queue_async(struct request_queue
*q
);
826 extern int blk_rq_map_user(struct request_queue
*, struct request
*,
827 struct rq_map_data
*, void __user
*, unsigned long,
829 extern int blk_rq_unmap_user(struct bio
*);
830 extern int blk_rq_map_kern(struct request_queue
*, struct request
*, void *, unsigned int, gfp_t
);
831 extern int blk_rq_map_user_iov(struct request_queue
*, struct request
*,
832 struct rq_map_data
*, struct sg_iovec
*, int,
833 unsigned int, gfp_t
);
834 extern int blk_execute_rq(struct request_queue
*, struct gendisk
*,
835 struct request
*, int);
836 extern void blk_execute_rq_nowait(struct request_queue
*, struct gendisk
*,
837 struct request
*, int, rq_end_io_fn
*);
839 static inline struct request_queue
*bdev_get_queue(struct block_device
*bdev
)
841 return bdev
->bd_disk
->queue
;
845 * blk_rq_pos() : the current sector
846 * blk_rq_bytes() : bytes left in the entire request
847 * blk_rq_cur_bytes() : bytes left in the current segment
848 * blk_rq_err_bytes() : bytes left till the next error boundary
849 * blk_rq_sectors() : sectors left in the entire request
850 * blk_rq_cur_sectors() : sectors left in the current segment
852 static inline sector_t
blk_rq_pos(const struct request
*rq
)
857 static inline unsigned int blk_rq_bytes(const struct request
*rq
)
859 return rq
->__data_len
;
862 static inline int blk_rq_cur_bytes(const struct request
*rq
)
864 return rq
->bio
? bio_cur_bytes(rq
->bio
) : 0;
867 extern unsigned int blk_rq_err_bytes(const struct request
*rq
);
869 static inline unsigned int blk_rq_sectors(const struct request
*rq
)
871 return blk_rq_bytes(rq
) >> 9;
874 static inline unsigned int blk_rq_cur_sectors(const struct request
*rq
)
876 return blk_rq_cur_bytes(rq
) >> 9;
879 static inline unsigned int blk_queue_get_max_sectors(struct request_queue
*q
,
880 unsigned int cmd_flags
)
882 if (unlikely(cmd_flags
& REQ_DISCARD
))
883 return min(q
->limits
.max_discard_sectors
, UINT_MAX
>> 9);
885 if (unlikely(cmd_flags
& REQ_WRITE_SAME
))
886 return q
->limits
.max_write_same_sectors
;
888 return q
->limits
.max_sectors
;
891 static inline unsigned int blk_rq_get_max_sectors(struct request
*rq
)
893 struct request_queue
*q
= rq
->q
;
895 if (unlikely(rq
->cmd_type
== REQ_TYPE_BLOCK_PC
))
896 return q
->limits
.max_hw_sectors
;
898 return blk_queue_get_max_sectors(q
, rq
->cmd_flags
);
901 static inline unsigned int blk_rq_count_bios(struct request
*rq
)
903 unsigned int nr_bios
= 0;
906 __rq_for_each_bio(bio
, rq
)
913 * Request issue related functions.
915 extern struct request
*blk_peek_request(struct request_queue
*q
);
916 extern void blk_start_request(struct request
*rq
);
917 extern struct request
*blk_fetch_request(struct request_queue
*q
);
920 * Request completion related functions.
922 * blk_update_request() completes given number of bytes and updates
923 * the request without completing it.
925 * blk_end_request() and friends. __blk_end_request() must be called
926 * with the request queue spinlock acquired.
928 * Several drivers define their own end_request and call
929 * blk_end_request() for parts of the original function.
930 * This prevents code duplication in drivers.
932 extern bool blk_update_request(struct request
*rq
, int error
,
933 unsigned int nr_bytes
);
934 extern bool blk_end_request(struct request
*rq
, int error
,
935 unsigned int nr_bytes
);
936 extern void blk_end_request_all(struct request
*rq
, int error
);
937 extern bool blk_end_request_cur(struct request
*rq
, int error
);
938 extern bool blk_end_request_err(struct request
*rq
, int error
);
939 extern bool __blk_end_request(struct request
*rq
, int error
,
940 unsigned int nr_bytes
);
941 extern void __blk_end_request_all(struct request
*rq
, int error
);
942 extern bool __blk_end_request_cur(struct request
*rq
, int error
);
943 extern bool __blk_end_request_err(struct request
*rq
, int error
);
945 extern void blk_complete_request(struct request
*);
946 extern void __blk_complete_request(struct request
*);
947 extern void blk_abort_request(struct request
*);
948 extern void blk_unprep_request(struct request
*);
951 * Access functions for manipulating queue properties
953 extern struct request_queue
*blk_init_queue_node(request_fn_proc
*rfn
,
954 spinlock_t
*lock
, int node_id
);
955 extern struct request_queue
*blk_init_queue(request_fn_proc
*, spinlock_t
*);
956 extern struct request_queue
*blk_init_allocated_queue(struct request_queue
*,
957 request_fn_proc
*, spinlock_t
*);
958 extern void blk_cleanup_queue(struct request_queue
*);
959 extern void blk_queue_make_request(struct request_queue
*, make_request_fn
*);
960 extern void blk_queue_bounce_limit(struct request_queue
*, u64
);
961 extern void blk_limits_max_hw_sectors(struct queue_limits
*, unsigned int);
962 extern void blk_queue_max_hw_sectors(struct request_queue
*, unsigned int);
963 extern void blk_queue_max_segments(struct request_queue
*, unsigned short);
964 extern void blk_queue_max_segment_size(struct request_queue
*, unsigned int);
965 extern void blk_queue_max_discard_sectors(struct request_queue
*q
,
966 unsigned int max_discard_sectors
);
967 extern void blk_queue_max_write_same_sectors(struct request_queue
*q
,
968 unsigned int max_write_same_sectors
);
969 extern void blk_queue_logical_block_size(struct request_queue
*, unsigned short);
970 extern void blk_queue_physical_block_size(struct request_queue
*, unsigned int);
971 extern void blk_queue_alignment_offset(struct request_queue
*q
,
972 unsigned int alignment
);
973 extern void blk_limits_io_min(struct queue_limits
*limits
, unsigned int min
);
974 extern void blk_queue_io_min(struct request_queue
*q
, unsigned int min
);
975 extern void blk_limits_io_opt(struct queue_limits
*limits
, unsigned int opt
);
976 extern void blk_queue_io_opt(struct request_queue
*q
, unsigned int opt
);
977 extern void blk_set_default_limits(struct queue_limits
*lim
);
978 extern void blk_set_stacking_limits(struct queue_limits
*lim
);
979 extern int blk_stack_limits(struct queue_limits
*t
, struct queue_limits
*b
,
981 extern int bdev_stack_limits(struct queue_limits
*t
, struct block_device
*bdev
,
983 extern void disk_stack_limits(struct gendisk
*disk
, struct block_device
*bdev
,
985 extern void blk_queue_stack_limits(struct request_queue
*t
, struct request_queue
*b
);
986 extern void blk_queue_dma_pad(struct request_queue
*, unsigned int);
987 extern void blk_queue_update_dma_pad(struct request_queue
*, unsigned int);
988 extern int blk_queue_dma_drain(struct request_queue
*q
,
989 dma_drain_needed_fn
*dma_drain_needed
,
990 void *buf
, unsigned int size
);
991 extern void blk_queue_lld_busy(struct request_queue
*q
, lld_busy_fn
*fn
);
992 extern void blk_queue_segment_boundary(struct request_queue
*, unsigned long);
993 extern void blk_queue_prep_rq(struct request_queue
*, prep_rq_fn
*pfn
);
994 extern void blk_queue_unprep_rq(struct request_queue
*, unprep_rq_fn
*ufn
);
995 extern void blk_queue_merge_bvec(struct request_queue
*, merge_bvec_fn
*);
996 extern void blk_queue_dma_alignment(struct request_queue
*, int);
997 extern void blk_queue_update_dma_alignment(struct request_queue
*, int);
998 extern void blk_queue_softirq_done(struct request_queue
*, softirq_done_fn
*);
999 extern void blk_queue_rq_timed_out(struct request_queue
*, rq_timed_out_fn
*);
1000 extern void blk_queue_rq_timeout(struct request_queue
*, unsigned int);
1001 extern void blk_queue_flush(struct request_queue
*q
, unsigned int flush
);
1002 extern void blk_queue_flush_queueable(struct request_queue
*q
, bool queueable
);
1003 extern struct backing_dev_info
*blk_get_backing_dev_info(struct block_device
*bdev
);
1005 extern int blk_rq_map_sg(struct request_queue
*, struct request
*, struct scatterlist
*);
1006 extern int blk_bio_map_sg(struct request_queue
*q
, struct bio
*bio
,
1007 struct scatterlist
*sglist
);
1008 extern void blk_dump_rq_flags(struct request
*, char *);
1009 extern long nr_blockdev_pages(void);
1011 bool __must_check
blk_get_queue(struct request_queue
*);
1012 struct request_queue
*blk_alloc_queue(gfp_t
);
1013 struct request_queue
*blk_alloc_queue_node(gfp_t
, int);
1014 extern void blk_put_queue(struct request_queue
*);
1017 * block layer runtime pm functions
1019 #ifdef CONFIG_PM_RUNTIME
1020 extern void blk_pm_runtime_init(struct request_queue
*q
, struct device
*dev
);
1021 extern int blk_pre_runtime_suspend(struct request_queue
*q
);
1022 extern void blk_post_runtime_suspend(struct request_queue
*q
, int err
);
1023 extern void blk_pre_runtime_resume(struct request_queue
*q
);
1024 extern void blk_post_runtime_resume(struct request_queue
*q
, int err
);
1026 static inline void blk_pm_runtime_init(struct request_queue
*q
,
1027 struct device
*dev
) {}
1028 static inline int blk_pre_runtime_suspend(struct request_queue
*q
)
1032 static inline void blk_post_runtime_suspend(struct request_queue
*q
, int err
) {}
1033 static inline void blk_pre_runtime_resume(struct request_queue
*q
) {}
1034 static inline void blk_post_runtime_resume(struct request_queue
*q
, int err
) {}
1038 * blk_plug permits building a queue of related requests by holding the I/O
1039 * fragments for a short period. This allows merging of sequential requests
1040 * into single larger request. As the requests are moved from a per-task list to
1041 * the device's request_queue in a batch, this results in improved scalability
1042 * as the lock contention for request_queue lock is reduced.
1044 * It is ok not to disable preemption when adding the request to the plug list
1045 * or when attempting a merge, because blk_schedule_flush_list() will only flush
1046 * the plug list when the task sleeps by itself. For details, please see
1047 * schedule() where blk_schedule_flush_plug() is called.
1050 unsigned long magic
; /* detect uninitialized use-cases */
1051 struct list_head list
; /* requests */
1052 struct list_head mq_list
; /* blk-mq requests */
1053 struct list_head cb_list
; /* md requires an unplug callback */
1055 #define BLK_MAX_REQUEST_COUNT 16
1058 typedef void (*blk_plug_cb_fn
)(struct blk_plug_cb
*, bool);
1059 struct blk_plug_cb
{
1060 struct list_head list
;
1061 blk_plug_cb_fn callback
;
1064 extern struct blk_plug_cb
*blk_check_plugged(blk_plug_cb_fn unplug
,
1065 void *data
, int size
);
1066 extern void blk_start_plug(struct blk_plug
*);
1067 extern void blk_finish_plug(struct blk_plug
*);
1068 extern void blk_flush_plug_list(struct blk_plug
*, bool);
1070 static inline void blk_flush_plug(struct task_struct
*tsk
)
1072 struct blk_plug
*plug
= tsk
->plug
;
1075 blk_flush_plug_list(plug
, false);
1078 static inline void blk_schedule_flush_plug(struct task_struct
*tsk
)
1080 struct blk_plug
*plug
= tsk
->plug
;
1083 blk_flush_plug_list(plug
, true);
1086 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1088 struct blk_plug
*plug
= tsk
->plug
;
1091 (!list_empty(&plug
->list
) ||
1092 !list_empty(&plug
->mq_list
) ||
1093 !list_empty(&plug
->cb_list
));
1099 #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED)
1100 extern int blk_queue_start_tag(struct request_queue
*, struct request
*);
1101 extern struct request
*blk_queue_find_tag(struct request_queue
*, int);
1102 extern void blk_queue_end_tag(struct request_queue
*, struct request
*);
1103 extern int blk_queue_init_tags(struct request_queue
*, int, struct blk_queue_tag
*);
1104 extern void blk_queue_free_tags(struct request_queue
*);
1105 extern int blk_queue_resize_tags(struct request_queue
*, int);
1106 extern void blk_queue_invalidate_tags(struct request_queue
*);
1107 extern struct blk_queue_tag
*blk_init_tags(int);
1108 extern void blk_free_tags(struct blk_queue_tag
*);
1110 static inline struct request
*blk_map_queue_find_tag(struct blk_queue_tag
*bqt
,
1113 if (unlikely(bqt
== NULL
|| tag
>= bqt
->real_max_depth
))
1115 return bqt
->tag_index
[tag
];
1118 #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */
1120 extern int blkdev_issue_flush(struct block_device
*, gfp_t
, sector_t
*);
1121 extern int blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1122 sector_t nr_sects
, gfp_t gfp_mask
, unsigned long flags
);
1123 extern int blkdev_issue_write_same(struct block_device
*bdev
, sector_t sector
,
1124 sector_t nr_sects
, gfp_t gfp_mask
, struct page
*page
);
1125 extern int blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1126 sector_t nr_sects
, gfp_t gfp_mask
);
1127 static inline int sb_issue_discard(struct super_block
*sb
, sector_t block
,
1128 sector_t nr_blocks
, gfp_t gfp_mask
, unsigned long flags
)
1130 return blkdev_issue_discard(sb
->s_bdev
, block
<< (sb
->s_blocksize_bits
- 9),
1131 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1134 static inline int sb_issue_zeroout(struct super_block
*sb
, sector_t block
,
1135 sector_t nr_blocks
, gfp_t gfp_mask
)
1137 return blkdev_issue_zeroout(sb
->s_bdev
,
1138 block
<< (sb
->s_blocksize_bits
- 9),
1139 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1143 extern int blk_verify_command(unsigned char *cmd
, fmode_t has_write_perm
);
1145 enum blk_default_limits
{
1146 BLK_MAX_SEGMENTS
= 128,
1147 BLK_SAFE_MAX_SECTORS
= 255,
1148 BLK_DEF_MAX_SECTORS
= 1024,
1149 BLK_MAX_SEGMENT_SIZE
= 65536,
1150 BLK_SEG_BOUNDARY_MASK
= 0xFFFFFFFFUL
,
1153 #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
1155 static inline unsigned long queue_bounce_pfn(struct request_queue
*q
)
1157 return q
->limits
.bounce_pfn
;
1160 static inline unsigned long queue_segment_boundary(struct request_queue
*q
)
1162 return q
->limits
.seg_boundary_mask
;
1165 static inline unsigned int queue_max_sectors(struct request_queue
*q
)
1167 return q
->limits
.max_sectors
;
1170 static inline unsigned int queue_max_hw_sectors(struct request_queue
*q
)
1172 return q
->limits
.max_hw_sectors
;
1175 static inline unsigned short queue_max_segments(struct request_queue
*q
)
1177 return q
->limits
.max_segments
;
1180 static inline unsigned int queue_max_segment_size(struct request_queue
*q
)
1182 return q
->limits
.max_segment_size
;
1185 static inline unsigned short queue_logical_block_size(struct request_queue
*q
)
1189 if (q
&& q
->limits
.logical_block_size
)
1190 retval
= q
->limits
.logical_block_size
;
1195 static inline unsigned short bdev_logical_block_size(struct block_device
*bdev
)
1197 return queue_logical_block_size(bdev_get_queue(bdev
));
1200 static inline unsigned int queue_physical_block_size(struct request_queue
*q
)
1202 return q
->limits
.physical_block_size
;
1205 static inline unsigned int bdev_physical_block_size(struct block_device
*bdev
)
1207 return queue_physical_block_size(bdev_get_queue(bdev
));
1210 static inline unsigned int queue_io_min(struct request_queue
*q
)
1212 return q
->limits
.io_min
;
1215 static inline int bdev_io_min(struct block_device
*bdev
)
1217 return queue_io_min(bdev_get_queue(bdev
));
1220 static inline unsigned int queue_io_opt(struct request_queue
*q
)
1222 return q
->limits
.io_opt
;
1225 static inline int bdev_io_opt(struct block_device
*bdev
)
1227 return queue_io_opt(bdev_get_queue(bdev
));
1230 static inline int queue_alignment_offset(struct request_queue
*q
)
1232 if (q
->limits
.misaligned
)
1235 return q
->limits
.alignment_offset
;
1238 static inline int queue_limit_alignment_offset(struct queue_limits
*lim
, sector_t sector
)
1240 unsigned int granularity
= max(lim
->physical_block_size
, lim
->io_min
);
1241 unsigned int alignment
= (sector
<< 9) & (granularity
- 1);
1243 return (granularity
+ lim
->alignment_offset
- alignment
)
1244 & (granularity
- 1);
1247 static inline int bdev_alignment_offset(struct block_device
*bdev
)
1249 struct request_queue
*q
= bdev_get_queue(bdev
);
1251 if (q
->limits
.misaligned
)
1254 if (bdev
!= bdev
->bd_contains
)
1255 return bdev
->bd_part
->alignment_offset
;
1257 return q
->limits
.alignment_offset
;
1260 static inline int queue_discard_alignment(struct request_queue
*q
)
1262 if (q
->limits
.discard_misaligned
)
1265 return q
->limits
.discard_alignment
;
1268 static inline int queue_limit_discard_alignment(struct queue_limits
*lim
, sector_t sector
)
1270 unsigned int alignment
, granularity
, offset
;
1272 if (!lim
->max_discard_sectors
)
1275 /* Why are these in bytes, not sectors? */
1276 alignment
= lim
->discard_alignment
>> 9;
1277 granularity
= lim
->discard_granularity
>> 9;
1281 /* Offset of the partition start in 'granularity' sectors */
1282 offset
= sector_div(sector
, granularity
);
1284 /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1285 offset
= (granularity
+ alignment
- offset
) % granularity
;
1287 /* Turn it back into bytes, gaah */
1291 static inline int bdev_discard_alignment(struct block_device
*bdev
)
1293 struct request_queue
*q
= bdev_get_queue(bdev
);
1295 if (bdev
!= bdev
->bd_contains
)
1296 return bdev
->bd_part
->discard_alignment
;
1298 return q
->limits
.discard_alignment
;
1301 static inline unsigned int queue_discard_zeroes_data(struct request_queue
*q
)
1303 if (q
->limits
.max_discard_sectors
&& q
->limits
.discard_zeroes_data
== 1)
1309 static inline unsigned int bdev_discard_zeroes_data(struct block_device
*bdev
)
1311 return queue_discard_zeroes_data(bdev_get_queue(bdev
));
1314 static inline unsigned int bdev_write_same(struct block_device
*bdev
)
1316 struct request_queue
*q
= bdev_get_queue(bdev
);
1319 return q
->limits
.max_write_same_sectors
;
1324 static inline int queue_dma_alignment(struct request_queue
*q
)
1326 return q
? q
->dma_alignment
: 511;
1329 static inline int blk_rq_aligned(struct request_queue
*q
, unsigned long addr
,
1332 unsigned int alignment
= queue_dma_alignment(q
) | q
->dma_pad_mask
;
1333 return !(addr
& alignment
) && !(len
& alignment
);
1336 /* assumes size > 256 */
1337 static inline unsigned int blksize_bits(unsigned int size
)
1339 unsigned int bits
= 8;
1343 } while (size
> 256);
1347 static inline unsigned int block_size(struct block_device
*bdev
)
1349 return bdev
->bd_block_size
;
1352 static inline bool queue_flush_queueable(struct request_queue
*q
)
1354 return !q
->flush_not_queueable
;
1357 typedef struct {struct page
*v
;} Sector
;
1359 unsigned char *read_dev_sector(struct block_device
*, sector_t
, Sector
*);
1361 static inline void put_dev_sector(Sector p
)
1363 page_cache_release(p
.v
);
1367 int kblockd_schedule_work(struct request_queue
*q
, struct work_struct
*work
);
1368 int kblockd_schedule_delayed_work(struct request_queue
*q
, struct delayed_work
*dwork
, unsigned long delay
);
1370 #ifdef CONFIG_BLK_CGROUP
1372 * This should not be using sched_clock(). A real patch is in progress
1373 * to fix this up, until that is in place we need to disable preemption
1374 * around sched_clock() in this function and set_io_start_time_ns().
1376 static inline void set_start_time_ns(struct request
*req
)
1379 req
->start_time_ns
= sched_clock();
1383 static inline void set_io_start_time_ns(struct request
*req
)
1386 req
->io_start_time_ns
= sched_clock();
1390 static inline uint64_t rq_start_time_ns(struct request
*req
)
1392 return req
->start_time_ns
;
1395 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1397 return req
->io_start_time_ns
;
1400 static inline void set_start_time_ns(struct request
*req
) {}
1401 static inline void set_io_start_time_ns(struct request
*req
) {}
1402 static inline uint64_t rq_start_time_ns(struct request
*req
)
1406 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1412 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1413 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1414 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1415 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1417 #if defined(CONFIG_BLK_DEV_INTEGRITY)
1419 #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */
1420 #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */
1422 struct blk_integrity_exchg
{
1426 unsigned int data_size
;
1427 unsigned short sector_size
;
1428 const char *disk_name
;
1431 typedef void (integrity_gen_fn
) (struct blk_integrity_exchg
*);
1432 typedef int (integrity_vrfy_fn
) (struct blk_integrity_exchg
*);
1433 typedef void (integrity_set_tag_fn
) (void *, void *, unsigned int);
1434 typedef void (integrity_get_tag_fn
) (void *, void *, unsigned int);
1436 struct blk_integrity
{
1437 integrity_gen_fn
*generate_fn
;
1438 integrity_vrfy_fn
*verify_fn
;
1439 integrity_set_tag_fn
*set_tag_fn
;
1440 integrity_get_tag_fn
*get_tag_fn
;
1442 unsigned short flags
;
1443 unsigned short tuple_size
;
1444 unsigned short sector_size
;
1445 unsigned short tag_size
;
1449 struct kobject kobj
;
1452 extern bool blk_integrity_is_initialized(struct gendisk
*);
1453 extern int blk_integrity_register(struct gendisk
*, struct blk_integrity
*);
1454 extern void blk_integrity_unregister(struct gendisk
*);
1455 extern int blk_integrity_compare(struct gendisk
*, struct gendisk
*);
1456 extern int blk_rq_map_integrity_sg(struct request_queue
*, struct bio
*,
1457 struct scatterlist
*);
1458 extern int blk_rq_count_integrity_sg(struct request_queue
*, struct bio
*);
1459 extern int blk_integrity_merge_rq(struct request_queue
*, struct request
*,
1461 extern int blk_integrity_merge_bio(struct request_queue
*, struct request
*,
1465 struct blk_integrity
*bdev_get_integrity(struct block_device
*bdev
)
1467 return bdev
->bd_disk
->integrity
;
1470 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1472 return disk
->integrity
;
1475 static inline int blk_integrity_rq(struct request
*rq
)
1477 if (rq
->bio
== NULL
)
1480 return bio_integrity(rq
->bio
);
1483 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1486 q
->limits
.max_integrity_segments
= segs
;
1489 static inline unsigned short
1490 queue_max_integrity_segments(struct request_queue
*q
)
1492 return q
->limits
.max_integrity_segments
;
1495 #else /* CONFIG_BLK_DEV_INTEGRITY */
1498 struct block_device
;
1500 struct blk_integrity
;
1502 static inline int blk_integrity_rq(struct request
*rq
)
1506 static inline int blk_rq_count_integrity_sg(struct request_queue
*q
,
1511 static inline int blk_rq_map_integrity_sg(struct request_queue
*q
,
1513 struct scatterlist
*s
)
1517 static inline struct blk_integrity
*bdev_get_integrity(struct block_device
*b
)
1521 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1525 static inline int blk_integrity_compare(struct gendisk
*a
, struct gendisk
*b
)
1529 static inline int blk_integrity_register(struct gendisk
*d
,
1530 struct blk_integrity
*b
)
1534 static inline void blk_integrity_unregister(struct gendisk
*d
)
1537 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1541 static inline unsigned short queue_max_integrity_segments(struct request_queue
*q
)
1545 static inline int blk_integrity_merge_rq(struct request_queue
*rq
,
1551 static inline int blk_integrity_merge_bio(struct request_queue
*rq
,
1557 static inline bool blk_integrity_is_initialized(struct gendisk
*g
)
1562 #endif /* CONFIG_BLK_DEV_INTEGRITY */
1564 struct block_device_operations
{
1565 int (*open
) (struct block_device
*, fmode_t
);
1566 void (*release
) (struct gendisk
*, fmode_t
);
1567 int (*ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1568 int (*compat_ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1569 int (*direct_access
) (struct block_device
*, sector_t
,
1570 void **, unsigned long *);
1571 unsigned int (*check_events
) (struct gendisk
*disk
,
1572 unsigned int clearing
);
1573 /* ->media_changed() is DEPRECATED, use ->check_events() instead */
1574 int (*media_changed
) (struct gendisk
*);
1575 void (*unlock_native_capacity
) (struct gendisk
*);
1576 int (*revalidate_disk
) (struct gendisk
*);
1577 int (*getgeo
)(struct block_device
*, struct hd_geometry
*);
1578 /* this callback is with swap_lock and sometimes page table lock held */
1579 void (*swap_slot_free_notify
) (struct block_device
*, unsigned long);
1580 struct module
*owner
;
1583 extern int __blkdev_driver_ioctl(struct block_device
*, fmode_t
, unsigned int,
1585 #else /* CONFIG_BLOCK */
1587 * stubs for when the block layer is configured out
1589 #define buffer_heads_over_limit 0
1591 static inline long nr_blockdev_pages(void)
1599 static inline void blk_start_plug(struct blk_plug
*plug
)
1603 static inline void blk_finish_plug(struct blk_plug
*plug
)
1607 static inline void blk_flush_plug(struct task_struct
*task
)
1611 static inline void blk_schedule_flush_plug(struct task_struct
*task
)
1616 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1621 #endif /* CONFIG_BLOCK */