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_work
;
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
;
294 unsigned char raid_partial_stripes_expensive
;
297 struct request_queue
{
299 * Together with queue_head for cacheline sharing
301 struct list_head queue_head
;
302 struct request
*last_merge
;
303 struct elevator_queue
*elevator
;
304 int nr_rqs
[2]; /* # allocated [a]sync rqs */
305 int nr_rqs_elvpriv
; /* # allocated rqs w/ elvpriv */
308 * If blkcg is not used, @q->root_rl serves all requests. If blkcg
309 * is used, root blkg allocates from @q->root_rl and all other
310 * blkgs from their own blkg->rl. Which one to use should be
311 * determined using bio_request_list().
313 struct request_list root_rl
;
315 request_fn_proc
*request_fn
;
316 make_request_fn
*make_request_fn
;
317 prep_rq_fn
*prep_rq_fn
;
318 unprep_rq_fn
*unprep_rq_fn
;
319 merge_bvec_fn
*merge_bvec_fn
;
320 softirq_done_fn
*softirq_done_fn
;
321 rq_timed_out_fn
*rq_timed_out_fn
;
322 dma_drain_needed_fn
*dma_drain_needed
;
323 lld_busy_fn
*lld_busy_fn
;
325 struct blk_mq_ops
*mq_ops
;
327 unsigned int *mq_map
;
330 struct blk_mq_ctx
*queue_ctx
;
331 unsigned int nr_queues
;
333 /* hw dispatch queues */
334 struct blk_mq_hw_ctx
**queue_hw_ctx
;
335 unsigned int nr_hw_queues
;
338 * Dispatch queue sorting
341 struct request
*boundary_rq
;
344 * Delayed queue handling
346 struct delayed_work delay_work
;
348 struct backing_dev_info backing_dev_info
;
351 * The queue owner gets to use this for whatever they like.
352 * ll_rw_blk doesn't touch it.
357 * various queue flags, see QUEUE_* below
359 unsigned long queue_flags
;
362 * ida allocated id for this queue. Used to index queues from
368 * queue needs bounce pages for pages above this limit
373 * protects queue structures from reentrancy. ->__queue_lock should
374 * _never_ be used directly, it is queue private. always use
377 spinlock_t __queue_lock
;
378 spinlock_t
*queue_lock
;
388 struct kobject mq_kobj
;
390 #ifdef CONFIG_PM_RUNTIME
393 unsigned int nr_pending
;
399 unsigned long nr_requests
; /* Max # of requests */
400 unsigned int nr_congestion_on
;
401 unsigned int nr_congestion_off
;
402 unsigned int nr_batching
;
404 unsigned int dma_drain_size
;
405 void *dma_drain_buffer
;
406 unsigned int dma_pad_mask
;
407 unsigned int dma_alignment
;
409 struct blk_queue_tag
*queue_tags
;
410 struct list_head tag_busy_list
;
412 unsigned int nr_sorted
;
413 unsigned int in_flight
[2];
415 * Number of active block driver functions for which blk_drain_queue()
416 * must wait. Must be incremented around functions that unlock the
417 * queue_lock internally, e.g. scsi_request_fn().
419 unsigned int request_fn_active
;
421 unsigned int rq_timeout
;
422 struct timer_list timeout
;
423 struct list_head timeout_list
;
425 struct list_head icq_list
;
426 #ifdef CONFIG_BLK_CGROUP
427 DECLARE_BITMAP (blkcg_pols
, BLKCG_MAX_POLS
);
428 struct blkcg_gq
*root_blkg
;
429 struct list_head blkg_list
;
432 struct queue_limits limits
;
437 unsigned int sg_timeout
;
438 unsigned int sg_reserved_size
;
440 #ifdef CONFIG_BLK_DEV_IO_TRACE
441 struct blk_trace
*blk_trace
;
444 * for flush operations
446 unsigned int flush_flags
;
447 unsigned int flush_not_queueable
:1;
448 unsigned int flush_queue_delayed
:1;
449 unsigned int flush_pending_idx
:1;
450 unsigned int flush_running_idx
:1;
451 unsigned long flush_pending_since
;
452 struct list_head flush_queue
[2];
453 struct list_head flush_data_in_flight
;
454 struct request
*flush_rq
;
455 spinlock_t mq_flush_lock
;
457 struct mutex sysfs_lock
;
461 #if defined(CONFIG_BLK_DEV_BSG)
462 bsg_job_fn
*bsg_job_fn
;
464 struct bsg_class_device bsg_dev
;
467 #ifdef CONFIG_BLK_DEV_THROTTLING
469 struct throtl_data
*td
;
471 struct rcu_head rcu_head
;
472 wait_queue_head_t mq_freeze_wq
;
473 struct percpu_counter mq_usage_counter
;
474 struct list_head all_q_node
;
477 #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */
478 #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */
479 #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */
480 #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */
481 #define QUEUE_FLAG_DYING 5 /* queue being torn down */
482 #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */
483 #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */
484 #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */
485 #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */
486 #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */
487 #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */
488 #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */
489 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
490 #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */
491 #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */
492 #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */
493 #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */
494 #define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */
495 #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */
496 #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */
497 #define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */
499 #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
500 (1 << QUEUE_FLAG_STACKABLE) | \
501 (1 << QUEUE_FLAG_SAME_COMP) | \
502 (1 << QUEUE_FLAG_ADD_RANDOM))
504 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
505 (1 << QUEUE_FLAG_SAME_COMP))
507 static inline void queue_lockdep_assert_held(struct request_queue
*q
)
510 lockdep_assert_held(q
->queue_lock
);
513 static inline void queue_flag_set_unlocked(unsigned int flag
,
514 struct request_queue
*q
)
516 __set_bit(flag
, &q
->queue_flags
);
519 static inline int queue_flag_test_and_clear(unsigned int flag
,
520 struct request_queue
*q
)
522 queue_lockdep_assert_held(q
);
524 if (test_bit(flag
, &q
->queue_flags
)) {
525 __clear_bit(flag
, &q
->queue_flags
);
532 static inline int queue_flag_test_and_set(unsigned int flag
,
533 struct request_queue
*q
)
535 queue_lockdep_assert_held(q
);
537 if (!test_bit(flag
, &q
->queue_flags
)) {
538 __set_bit(flag
, &q
->queue_flags
);
545 static inline void queue_flag_set(unsigned int flag
, struct request_queue
*q
)
547 queue_lockdep_assert_held(q
);
548 __set_bit(flag
, &q
->queue_flags
);
551 static inline void queue_flag_clear_unlocked(unsigned int flag
,
552 struct request_queue
*q
)
554 __clear_bit(flag
, &q
->queue_flags
);
557 static inline int queue_in_flight(struct request_queue
*q
)
559 return q
->in_flight
[0] + q
->in_flight
[1];
562 static inline void queue_flag_clear(unsigned int flag
, struct request_queue
*q
)
564 queue_lockdep_assert_held(q
);
565 __clear_bit(flag
, &q
->queue_flags
);
568 #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
569 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
570 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
571 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
572 #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags)
573 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
574 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
575 #define blk_queue_noxmerges(q) \
576 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
577 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
578 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
579 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
580 #define blk_queue_stackable(q) \
581 test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
582 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
583 #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \
584 test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags))
586 #define blk_noretry_request(rq) \
587 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
588 REQ_FAILFAST_DRIVER))
590 #define blk_account_rq(rq) \
591 (((rq)->cmd_flags & REQ_STARTED) && \
592 ((rq)->cmd_type == REQ_TYPE_FS))
594 #define blk_pm_request(rq) \
595 ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \
596 (rq)->cmd_type == REQ_TYPE_PM_RESUME)
598 #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
599 #define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
600 /* rq->queuelist of dequeued request must be list_empty() */
601 #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
603 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
605 #define rq_data_dir(rq) (((rq)->cmd_flags & 1) != 0)
607 static inline unsigned int blk_queue_cluster(struct request_queue
*q
)
609 return q
->limits
.cluster
;
613 * We regard a request as sync, if either a read or a sync write
615 static inline bool rw_is_sync(unsigned int rw_flags
)
617 return !(rw_flags
& REQ_WRITE
) || (rw_flags
& REQ_SYNC
);
620 static inline bool rq_is_sync(struct request
*rq
)
622 return rw_is_sync(rq
->cmd_flags
);
625 static inline bool blk_rl_full(struct request_list
*rl
, bool sync
)
627 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
629 return rl
->flags
& flag
;
632 static inline void blk_set_rl_full(struct request_list
*rl
, bool sync
)
634 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
639 static inline void blk_clear_rl_full(struct request_list
*rl
, bool sync
)
641 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
646 static inline bool rq_mergeable(struct request
*rq
)
648 if (rq
->cmd_type
!= REQ_TYPE_FS
)
651 if (rq
->cmd_flags
& REQ_NOMERGE_FLAGS
)
657 static inline bool blk_check_merge_flags(unsigned int flags1
,
660 if ((flags1
& REQ_DISCARD
) != (flags2
& REQ_DISCARD
))
663 if ((flags1
& REQ_SECURE
) != (flags2
& REQ_SECURE
))
666 if ((flags1
& REQ_WRITE_SAME
) != (flags2
& REQ_WRITE_SAME
))
672 static inline bool blk_write_same_mergeable(struct bio
*a
, struct bio
*b
)
674 if (bio_data(a
) == bio_data(b
))
681 * q->prep_rq_fn return values
683 #define BLKPREP_OK 0 /* serve it */
684 #define BLKPREP_KILL 1 /* fatal error, kill */
685 #define BLKPREP_DEFER 2 /* leave on queue */
687 extern unsigned long blk_max_low_pfn
, blk_max_pfn
;
690 * standard bounce addresses:
692 * BLK_BOUNCE_HIGH : bounce all highmem pages
693 * BLK_BOUNCE_ANY : don't bounce anything
694 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
697 #if BITS_PER_LONG == 32
698 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
700 #define BLK_BOUNCE_HIGH -1ULL
702 #define BLK_BOUNCE_ANY (-1ULL)
703 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
706 * default timeout for SG_IO if none specified
708 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
709 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
712 extern int init_emergency_isa_pool(void);
713 extern void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
);
715 static inline int init_emergency_isa_pool(void)
719 static inline void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
)
722 #endif /* CONFIG_MMU */
728 unsigned long offset
;
733 struct req_iterator
{
734 struct bvec_iter iter
;
738 /* This should not be used directly - use rq_for_each_segment */
739 #define for_each_bio(_bio) \
740 for (; _bio; _bio = _bio->bi_next)
741 #define __rq_for_each_bio(_bio, rq) \
743 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
745 #define rq_for_each_segment(bvl, _rq, _iter) \
746 __rq_for_each_bio(_iter.bio, _rq) \
747 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
749 #define rq_iter_last(bvec, _iter) \
750 (_iter.bio->bi_next == NULL && \
751 bio_iter_last(bvec, _iter.iter))
753 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
754 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
756 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
757 extern void rq_flush_dcache_pages(struct request
*rq
);
759 static inline void rq_flush_dcache_pages(struct request
*rq
)
764 extern int blk_register_queue(struct gendisk
*disk
);
765 extern void blk_unregister_queue(struct gendisk
*disk
);
766 extern void generic_make_request(struct bio
*bio
);
767 extern void blk_rq_init(struct request_queue
*q
, struct request
*rq
);
768 extern void blk_put_request(struct request
*);
769 extern void __blk_put_request(struct request_queue
*, struct request
*);
770 extern struct request
*blk_get_request(struct request_queue
*, int, gfp_t
);
771 extern struct request
*blk_make_request(struct request_queue
*, struct bio
*,
773 extern void blk_requeue_request(struct request_queue
*, struct request
*);
774 extern void blk_add_request_payload(struct request
*rq
, struct page
*page
,
776 extern int blk_rq_check_limits(struct request_queue
*q
, struct request
*rq
);
777 extern int blk_lld_busy(struct request_queue
*q
);
778 extern int blk_rq_prep_clone(struct request
*rq
, struct request
*rq_src
,
779 struct bio_set
*bs
, gfp_t gfp_mask
,
780 int (*bio_ctr
)(struct bio
*, struct bio
*, void *),
782 extern void blk_rq_unprep_clone(struct request
*rq
);
783 extern int blk_insert_cloned_request(struct request_queue
*q
,
785 extern void blk_delay_queue(struct request_queue
*, unsigned long);
786 extern void blk_recount_segments(struct request_queue
*, struct bio
*);
787 extern int scsi_verify_blk_ioctl(struct block_device
*, unsigned int);
788 extern int scsi_cmd_blk_ioctl(struct block_device
*, fmode_t
,
789 unsigned int, void __user
*);
790 extern int scsi_cmd_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
791 unsigned int, void __user
*);
792 extern int sg_scsi_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
793 struct scsi_ioctl_command __user
*);
795 extern void blk_queue_bio(struct request_queue
*q
, struct bio
*bio
);
798 * A queue has just exitted congestion. Note this in the global counter of
799 * congested queues, and wake up anyone who was waiting for requests to be
802 static inline void blk_clear_queue_congested(struct request_queue
*q
, int sync
)
804 clear_bdi_congested(&q
->backing_dev_info
, sync
);
808 * A queue has just entered congestion. Flag that in the queue's VM-visible
809 * state flags and increment the global gounter of congested queues.
811 static inline void blk_set_queue_congested(struct request_queue
*q
, int sync
)
813 set_bdi_congested(&q
->backing_dev_info
, sync
);
816 extern void blk_start_queue(struct request_queue
*q
);
817 extern void blk_stop_queue(struct request_queue
*q
);
818 extern void blk_sync_queue(struct request_queue
*q
);
819 extern void __blk_stop_queue(struct request_queue
*q
);
820 extern void __blk_run_queue(struct request_queue
*q
);
821 extern void blk_run_queue(struct request_queue
*);
822 extern void blk_run_queue_async(struct request_queue
*q
);
823 extern int blk_rq_map_user(struct request_queue
*, struct request
*,
824 struct rq_map_data
*, void __user
*, unsigned long,
826 extern int blk_rq_unmap_user(struct bio
*);
827 extern int blk_rq_map_kern(struct request_queue
*, struct request
*, void *, unsigned int, gfp_t
);
828 extern int blk_rq_map_user_iov(struct request_queue
*, struct request
*,
829 struct rq_map_data
*, struct sg_iovec
*, int,
830 unsigned int, gfp_t
);
831 extern int blk_execute_rq(struct request_queue
*, struct gendisk
*,
832 struct request
*, int);
833 extern void blk_execute_rq_nowait(struct request_queue
*, struct gendisk
*,
834 struct request
*, int, rq_end_io_fn
*);
836 static inline struct request_queue
*bdev_get_queue(struct block_device
*bdev
)
838 return bdev
->bd_disk
->queue
;
842 * blk_rq_pos() : the current sector
843 * blk_rq_bytes() : bytes left in the entire request
844 * blk_rq_cur_bytes() : bytes left in the current segment
845 * blk_rq_err_bytes() : bytes left till the next error boundary
846 * blk_rq_sectors() : sectors left in the entire request
847 * blk_rq_cur_sectors() : sectors left in the current segment
849 static inline sector_t
blk_rq_pos(const struct request
*rq
)
854 static inline unsigned int blk_rq_bytes(const struct request
*rq
)
856 return rq
->__data_len
;
859 static inline int blk_rq_cur_bytes(const struct request
*rq
)
861 return rq
->bio
? bio_cur_bytes(rq
->bio
) : 0;
864 extern unsigned int blk_rq_err_bytes(const struct request
*rq
);
866 static inline unsigned int blk_rq_sectors(const struct request
*rq
)
868 return blk_rq_bytes(rq
) >> 9;
871 static inline unsigned int blk_rq_cur_sectors(const struct request
*rq
)
873 return blk_rq_cur_bytes(rq
) >> 9;
876 static inline unsigned int blk_queue_get_max_sectors(struct request_queue
*q
,
877 unsigned int cmd_flags
)
879 if (unlikely(cmd_flags
& REQ_DISCARD
))
880 return min(q
->limits
.max_discard_sectors
, UINT_MAX
>> 9);
882 if (unlikely(cmd_flags
& REQ_WRITE_SAME
))
883 return q
->limits
.max_write_same_sectors
;
885 return q
->limits
.max_sectors
;
888 static inline unsigned int blk_rq_get_max_sectors(struct request
*rq
)
890 struct request_queue
*q
= rq
->q
;
892 if (unlikely(rq
->cmd_type
== REQ_TYPE_BLOCK_PC
))
893 return q
->limits
.max_hw_sectors
;
895 return blk_queue_get_max_sectors(q
, rq
->cmd_flags
);
898 static inline unsigned int blk_rq_count_bios(struct request
*rq
)
900 unsigned int nr_bios
= 0;
903 __rq_for_each_bio(bio
, rq
)
910 * Request issue related functions.
912 extern struct request
*blk_peek_request(struct request_queue
*q
);
913 extern void blk_start_request(struct request
*rq
);
914 extern struct request
*blk_fetch_request(struct request_queue
*q
);
917 * Request completion related functions.
919 * blk_update_request() completes given number of bytes and updates
920 * the request without completing it.
922 * blk_end_request() and friends. __blk_end_request() must be called
923 * with the request queue spinlock acquired.
925 * Several drivers define their own end_request and call
926 * blk_end_request() for parts of the original function.
927 * This prevents code duplication in drivers.
929 extern bool blk_update_request(struct request
*rq
, int error
,
930 unsigned int nr_bytes
);
931 extern bool blk_end_request(struct request
*rq
, int error
,
932 unsigned int nr_bytes
);
933 extern void blk_end_request_all(struct request
*rq
, int error
);
934 extern bool blk_end_request_cur(struct request
*rq
, int error
);
935 extern bool blk_end_request_err(struct request
*rq
, int error
);
936 extern bool __blk_end_request(struct request
*rq
, int error
,
937 unsigned int nr_bytes
);
938 extern void __blk_end_request_all(struct request
*rq
, int error
);
939 extern bool __blk_end_request_cur(struct request
*rq
, int error
);
940 extern bool __blk_end_request_err(struct request
*rq
, int error
);
942 extern void blk_complete_request(struct request
*);
943 extern void __blk_complete_request(struct request
*);
944 extern void blk_abort_request(struct request
*);
945 extern void blk_unprep_request(struct request
*);
948 * Access functions for manipulating queue properties
950 extern struct request_queue
*blk_init_queue_node(request_fn_proc
*rfn
,
951 spinlock_t
*lock
, int node_id
);
952 extern struct request_queue
*blk_init_queue(request_fn_proc
*, spinlock_t
*);
953 extern struct request_queue
*blk_init_allocated_queue(struct request_queue
*,
954 request_fn_proc
*, spinlock_t
*);
955 extern void blk_cleanup_queue(struct request_queue
*);
956 extern void blk_queue_make_request(struct request_queue
*, make_request_fn
*);
957 extern void blk_queue_bounce_limit(struct request_queue
*, u64
);
958 extern void blk_limits_max_hw_sectors(struct queue_limits
*, unsigned int);
959 extern void blk_queue_max_hw_sectors(struct request_queue
*, unsigned int);
960 extern void blk_queue_max_segments(struct request_queue
*, unsigned short);
961 extern void blk_queue_max_segment_size(struct request_queue
*, unsigned int);
962 extern void blk_queue_max_discard_sectors(struct request_queue
*q
,
963 unsigned int max_discard_sectors
);
964 extern void blk_queue_max_write_same_sectors(struct request_queue
*q
,
965 unsigned int max_write_same_sectors
);
966 extern void blk_queue_logical_block_size(struct request_queue
*, unsigned short);
967 extern void blk_queue_physical_block_size(struct request_queue
*, unsigned int);
968 extern void blk_queue_alignment_offset(struct request_queue
*q
,
969 unsigned int alignment
);
970 extern void blk_limits_io_min(struct queue_limits
*limits
, unsigned int min
);
971 extern void blk_queue_io_min(struct request_queue
*q
, unsigned int min
);
972 extern void blk_limits_io_opt(struct queue_limits
*limits
, unsigned int opt
);
973 extern void blk_queue_io_opt(struct request_queue
*q
, unsigned int opt
);
974 extern void blk_set_default_limits(struct queue_limits
*lim
);
975 extern void blk_set_stacking_limits(struct queue_limits
*lim
);
976 extern int blk_stack_limits(struct queue_limits
*t
, struct queue_limits
*b
,
978 extern int bdev_stack_limits(struct queue_limits
*t
, struct block_device
*bdev
,
980 extern void disk_stack_limits(struct gendisk
*disk
, struct block_device
*bdev
,
982 extern void blk_queue_stack_limits(struct request_queue
*t
, struct request_queue
*b
);
983 extern void blk_queue_dma_pad(struct request_queue
*, unsigned int);
984 extern void blk_queue_update_dma_pad(struct request_queue
*, unsigned int);
985 extern int blk_queue_dma_drain(struct request_queue
*q
,
986 dma_drain_needed_fn
*dma_drain_needed
,
987 void *buf
, unsigned int size
);
988 extern void blk_queue_lld_busy(struct request_queue
*q
, lld_busy_fn
*fn
);
989 extern void blk_queue_segment_boundary(struct request_queue
*, unsigned long);
990 extern void blk_queue_prep_rq(struct request_queue
*, prep_rq_fn
*pfn
);
991 extern void blk_queue_unprep_rq(struct request_queue
*, unprep_rq_fn
*ufn
);
992 extern void blk_queue_merge_bvec(struct request_queue
*, merge_bvec_fn
*);
993 extern void blk_queue_dma_alignment(struct request_queue
*, int);
994 extern void blk_queue_update_dma_alignment(struct request_queue
*, int);
995 extern void blk_queue_softirq_done(struct request_queue
*, softirq_done_fn
*);
996 extern void blk_queue_rq_timed_out(struct request_queue
*, rq_timed_out_fn
*);
997 extern void blk_queue_rq_timeout(struct request_queue
*, unsigned int);
998 extern void blk_queue_flush(struct request_queue
*q
, unsigned int flush
);
999 extern void blk_queue_flush_queueable(struct request_queue
*q
, bool queueable
);
1000 extern struct backing_dev_info
*blk_get_backing_dev_info(struct block_device
*bdev
);
1002 extern int blk_rq_map_sg(struct request_queue
*, struct request
*, struct scatterlist
*);
1003 extern int blk_bio_map_sg(struct request_queue
*q
, struct bio
*bio
,
1004 struct scatterlist
*sglist
);
1005 extern void blk_dump_rq_flags(struct request
*, char *);
1006 extern long nr_blockdev_pages(void);
1008 bool __must_check
blk_get_queue(struct request_queue
*);
1009 struct request_queue
*blk_alloc_queue(gfp_t
);
1010 struct request_queue
*blk_alloc_queue_node(gfp_t
, int);
1011 extern void blk_put_queue(struct request_queue
*);
1014 * block layer runtime pm functions
1016 #ifdef CONFIG_PM_RUNTIME
1017 extern void blk_pm_runtime_init(struct request_queue
*q
, struct device
*dev
);
1018 extern int blk_pre_runtime_suspend(struct request_queue
*q
);
1019 extern void blk_post_runtime_suspend(struct request_queue
*q
, int err
);
1020 extern void blk_pre_runtime_resume(struct request_queue
*q
);
1021 extern void blk_post_runtime_resume(struct request_queue
*q
, int err
);
1023 static inline void blk_pm_runtime_init(struct request_queue
*q
,
1024 struct device
*dev
) {}
1025 static inline int blk_pre_runtime_suspend(struct request_queue
*q
)
1029 static inline void blk_post_runtime_suspend(struct request_queue
*q
, int err
) {}
1030 static inline void blk_pre_runtime_resume(struct request_queue
*q
) {}
1031 static inline void blk_post_runtime_resume(struct request_queue
*q
, int err
) {}
1035 * blk_plug permits building a queue of related requests by holding the I/O
1036 * fragments for a short period. This allows merging of sequential requests
1037 * into single larger request. As the requests are moved from a per-task list to
1038 * the device's request_queue in a batch, this results in improved scalability
1039 * as the lock contention for request_queue lock is reduced.
1041 * It is ok not to disable preemption when adding the request to the plug list
1042 * or when attempting a merge, because blk_schedule_flush_list() will only flush
1043 * the plug list when the task sleeps by itself. For details, please see
1044 * schedule() where blk_schedule_flush_plug() is called.
1047 unsigned long magic
; /* detect uninitialized use-cases */
1048 struct list_head list
; /* requests */
1049 struct list_head mq_list
; /* blk-mq requests */
1050 struct list_head cb_list
; /* md requires an unplug callback */
1052 #define BLK_MAX_REQUEST_COUNT 16
1055 typedef void (*blk_plug_cb_fn
)(struct blk_plug_cb
*, bool);
1056 struct blk_plug_cb
{
1057 struct list_head list
;
1058 blk_plug_cb_fn callback
;
1061 extern struct blk_plug_cb
*blk_check_plugged(blk_plug_cb_fn unplug
,
1062 void *data
, int size
);
1063 extern void blk_start_plug(struct blk_plug
*);
1064 extern void blk_finish_plug(struct blk_plug
*);
1065 extern void blk_flush_plug_list(struct blk_plug
*, bool);
1067 static inline void blk_flush_plug(struct task_struct
*tsk
)
1069 struct blk_plug
*plug
= tsk
->plug
;
1072 blk_flush_plug_list(plug
, false);
1075 static inline void blk_schedule_flush_plug(struct task_struct
*tsk
)
1077 struct blk_plug
*plug
= tsk
->plug
;
1080 blk_flush_plug_list(plug
, true);
1083 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1085 struct blk_plug
*plug
= tsk
->plug
;
1088 (!list_empty(&plug
->list
) ||
1089 !list_empty(&plug
->mq_list
) ||
1090 !list_empty(&plug
->cb_list
));
1096 #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED)
1097 extern int blk_queue_start_tag(struct request_queue
*, struct request
*);
1098 extern struct request
*blk_queue_find_tag(struct request_queue
*, int);
1099 extern void blk_queue_end_tag(struct request_queue
*, struct request
*);
1100 extern int blk_queue_init_tags(struct request_queue
*, int, struct blk_queue_tag
*);
1101 extern void blk_queue_free_tags(struct request_queue
*);
1102 extern int blk_queue_resize_tags(struct request_queue
*, int);
1103 extern void blk_queue_invalidate_tags(struct request_queue
*);
1104 extern struct blk_queue_tag
*blk_init_tags(int);
1105 extern void blk_free_tags(struct blk_queue_tag
*);
1107 static inline struct request
*blk_map_queue_find_tag(struct blk_queue_tag
*bqt
,
1110 if (unlikely(bqt
== NULL
|| tag
>= bqt
->real_max_depth
))
1112 return bqt
->tag_index
[tag
];
1115 #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */
1117 extern int blkdev_issue_flush(struct block_device
*, gfp_t
, sector_t
*);
1118 extern int blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1119 sector_t nr_sects
, gfp_t gfp_mask
, unsigned long flags
);
1120 extern int blkdev_issue_write_same(struct block_device
*bdev
, sector_t sector
,
1121 sector_t nr_sects
, gfp_t gfp_mask
, struct page
*page
);
1122 extern int blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1123 sector_t nr_sects
, gfp_t gfp_mask
);
1124 static inline int sb_issue_discard(struct super_block
*sb
, sector_t block
,
1125 sector_t nr_blocks
, gfp_t gfp_mask
, unsigned long flags
)
1127 return blkdev_issue_discard(sb
->s_bdev
, block
<< (sb
->s_blocksize_bits
- 9),
1128 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1131 static inline int sb_issue_zeroout(struct super_block
*sb
, sector_t block
,
1132 sector_t nr_blocks
, gfp_t gfp_mask
)
1134 return blkdev_issue_zeroout(sb
->s_bdev
,
1135 block
<< (sb
->s_blocksize_bits
- 9),
1136 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1140 extern int blk_verify_command(unsigned char *cmd
, fmode_t has_write_perm
);
1142 enum blk_default_limits
{
1143 BLK_MAX_SEGMENTS
= 128,
1144 BLK_SAFE_MAX_SECTORS
= 255,
1145 BLK_DEF_MAX_SECTORS
= 1024,
1146 BLK_MAX_SEGMENT_SIZE
= 65536,
1147 BLK_SEG_BOUNDARY_MASK
= 0xFFFFFFFFUL
,
1150 #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
1152 static inline unsigned long queue_bounce_pfn(struct request_queue
*q
)
1154 return q
->limits
.bounce_pfn
;
1157 static inline unsigned long queue_segment_boundary(struct request_queue
*q
)
1159 return q
->limits
.seg_boundary_mask
;
1162 static inline unsigned int queue_max_sectors(struct request_queue
*q
)
1164 return q
->limits
.max_sectors
;
1167 static inline unsigned int queue_max_hw_sectors(struct request_queue
*q
)
1169 return q
->limits
.max_hw_sectors
;
1172 static inline unsigned short queue_max_segments(struct request_queue
*q
)
1174 return q
->limits
.max_segments
;
1177 static inline unsigned int queue_max_segment_size(struct request_queue
*q
)
1179 return q
->limits
.max_segment_size
;
1182 static inline unsigned short queue_logical_block_size(struct request_queue
*q
)
1186 if (q
&& q
->limits
.logical_block_size
)
1187 retval
= q
->limits
.logical_block_size
;
1192 static inline unsigned short bdev_logical_block_size(struct block_device
*bdev
)
1194 return queue_logical_block_size(bdev_get_queue(bdev
));
1197 static inline unsigned int queue_physical_block_size(struct request_queue
*q
)
1199 return q
->limits
.physical_block_size
;
1202 static inline unsigned int bdev_physical_block_size(struct block_device
*bdev
)
1204 return queue_physical_block_size(bdev_get_queue(bdev
));
1207 static inline unsigned int queue_io_min(struct request_queue
*q
)
1209 return q
->limits
.io_min
;
1212 static inline int bdev_io_min(struct block_device
*bdev
)
1214 return queue_io_min(bdev_get_queue(bdev
));
1217 static inline unsigned int queue_io_opt(struct request_queue
*q
)
1219 return q
->limits
.io_opt
;
1222 static inline int bdev_io_opt(struct block_device
*bdev
)
1224 return queue_io_opt(bdev_get_queue(bdev
));
1227 static inline int queue_alignment_offset(struct request_queue
*q
)
1229 if (q
->limits
.misaligned
)
1232 return q
->limits
.alignment_offset
;
1235 static inline int queue_limit_alignment_offset(struct queue_limits
*lim
, sector_t sector
)
1237 unsigned int granularity
= max(lim
->physical_block_size
, lim
->io_min
);
1238 unsigned int alignment
= (sector
<< 9) & (granularity
- 1);
1240 return (granularity
+ lim
->alignment_offset
- alignment
)
1241 & (granularity
- 1);
1244 static inline int bdev_alignment_offset(struct block_device
*bdev
)
1246 struct request_queue
*q
= bdev_get_queue(bdev
);
1248 if (q
->limits
.misaligned
)
1251 if (bdev
!= bdev
->bd_contains
)
1252 return bdev
->bd_part
->alignment_offset
;
1254 return q
->limits
.alignment_offset
;
1257 static inline int queue_discard_alignment(struct request_queue
*q
)
1259 if (q
->limits
.discard_misaligned
)
1262 return q
->limits
.discard_alignment
;
1265 static inline int queue_limit_discard_alignment(struct queue_limits
*lim
, sector_t sector
)
1267 unsigned int alignment
, granularity
, offset
;
1269 if (!lim
->max_discard_sectors
)
1272 /* Why are these in bytes, not sectors? */
1273 alignment
= lim
->discard_alignment
>> 9;
1274 granularity
= lim
->discard_granularity
>> 9;
1278 /* Offset of the partition start in 'granularity' sectors */
1279 offset
= sector_div(sector
, granularity
);
1281 /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1282 offset
= (granularity
+ alignment
- offset
) % granularity
;
1284 /* Turn it back into bytes, gaah */
1288 static inline int bdev_discard_alignment(struct block_device
*bdev
)
1290 struct request_queue
*q
= bdev_get_queue(bdev
);
1292 if (bdev
!= bdev
->bd_contains
)
1293 return bdev
->bd_part
->discard_alignment
;
1295 return q
->limits
.discard_alignment
;
1298 static inline unsigned int queue_discard_zeroes_data(struct request_queue
*q
)
1300 if (q
->limits
.max_discard_sectors
&& q
->limits
.discard_zeroes_data
== 1)
1306 static inline unsigned int bdev_discard_zeroes_data(struct block_device
*bdev
)
1308 return queue_discard_zeroes_data(bdev_get_queue(bdev
));
1311 static inline unsigned int bdev_write_same(struct block_device
*bdev
)
1313 struct request_queue
*q
= bdev_get_queue(bdev
);
1316 return q
->limits
.max_write_same_sectors
;
1321 static inline int queue_dma_alignment(struct request_queue
*q
)
1323 return q
? q
->dma_alignment
: 511;
1326 static inline int blk_rq_aligned(struct request_queue
*q
, unsigned long addr
,
1329 unsigned int alignment
= queue_dma_alignment(q
) | q
->dma_pad_mask
;
1330 return !(addr
& alignment
) && !(len
& alignment
);
1333 /* assumes size > 256 */
1334 static inline unsigned int blksize_bits(unsigned int size
)
1336 unsigned int bits
= 8;
1340 } while (size
> 256);
1344 static inline unsigned int block_size(struct block_device
*bdev
)
1346 return bdev
->bd_block_size
;
1349 static inline bool queue_flush_queueable(struct request_queue
*q
)
1351 return !q
->flush_not_queueable
;
1354 typedef struct {struct page
*v
;} Sector
;
1356 unsigned char *read_dev_sector(struct block_device
*, sector_t
, Sector
*);
1358 static inline void put_dev_sector(Sector p
)
1360 page_cache_release(p
.v
);
1364 int kblockd_schedule_work(struct request_queue
*q
, struct work_struct
*work
);
1365 int kblockd_schedule_delayed_work(struct request_queue
*q
, struct delayed_work
*dwork
, unsigned long delay
);
1367 #ifdef CONFIG_BLK_CGROUP
1369 * This should not be using sched_clock(). A real patch is in progress
1370 * to fix this up, until that is in place we need to disable preemption
1371 * around sched_clock() in this function and set_io_start_time_ns().
1373 static inline void set_start_time_ns(struct request
*req
)
1376 req
->start_time_ns
= sched_clock();
1380 static inline void set_io_start_time_ns(struct request
*req
)
1383 req
->io_start_time_ns
= sched_clock();
1387 static inline uint64_t rq_start_time_ns(struct request
*req
)
1389 return req
->start_time_ns
;
1392 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1394 return req
->io_start_time_ns
;
1397 static inline void set_start_time_ns(struct request
*req
) {}
1398 static inline void set_io_start_time_ns(struct request
*req
) {}
1399 static inline uint64_t rq_start_time_ns(struct request
*req
)
1403 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1409 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1410 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1411 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1412 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1414 #if defined(CONFIG_BLK_DEV_INTEGRITY)
1416 #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */
1417 #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */
1419 struct blk_integrity_exchg
{
1423 unsigned int data_size
;
1424 unsigned short sector_size
;
1425 const char *disk_name
;
1428 typedef void (integrity_gen_fn
) (struct blk_integrity_exchg
*);
1429 typedef int (integrity_vrfy_fn
) (struct blk_integrity_exchg
*);
1430 typedef void (integrity_set_tag_fn
) (void *, void *, unsigned int);
1431 typedef void (integrity_get_tag_fn
) (void *, void *, unsigned int);
1433 struct blk_integrity
{
1434 integrity_gen_fn
*generate_fn
;
1435 integrity_vrfy_fn
*verify_fn
;
1436 integrity_set_tag_fn
*set_tag_fn
;
1437 integrity_get_tag_fn
*get_tag_fn
;
1439 unsigned short flags
;
1440 unsigned short tuple_size
;
1441 unsigned short sector_size
;
1442 unsigned short tag_size
;
1446 struct kobject kobj
;
1449 extern bool blk_integrity_is_initialized(struct gendisk
*);
1450 extern int blk_integrity_register(struct gendisk
*, struct blk_integrity
*);
1451 extern void blk_integrity_unregister(struct gendisk
*);
1452 extern int blk_integrity_compare(struct gendisk
*, struct gendisk
*);
1453 extern int blk_rq_map_integrity_sg(struct request_queue
*, struct bio
*,
1454 struct scatterlist
*);
1455 extern int blk_rq_count_integrity_sg(struct request_queue
*, struct bio
*);
1456 extern int blk_integrity_merge_rq(struct request_queue
*, struct request
*,
1458 extern int blk_integrity_merge_bio(struct request_queue
*, struct request
*,
1462 struct blk_integrity
*bdev_get_integrity(struct block_device
*bdev
)
1464 return bdev
->bd_disk
->integrity
;
1467 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1469 return disk
->integrity
;
1472 static inline int blk_integrity_rq(struct request
*rq
)
1474 if (rq
->bio
== NULL
)
1477 return bio_integrity(rq
->bio
);
1480 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1483 q
->limits
.max_integrity_segments
= segs
;
1486 static inline unsigned short
1487 queue_max_integrity_segments(struct request_queue
*q
)
1489 return q
->limits
.max_integrity_segments
;
1492 #else /* CONFIG_BLK_DEV_INTEGRITY */
1495 struct block_device
;
1497 struct blk_integrity
;
1499 static inline int blk_integrity_rq(struct request
*rq
)
1503 static inline int blk_rq_count_integrity_sg(struct request_queue
*q
,
1508 static inline int blk_rq_map_integrity_sg(struct request_queue
*q
,
1510 struct scatterlist
*s
)
1514 static inline struct blk_integrity
*bdev_get_integrity(struct block_device
*b
)
1518 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1522 static inline int blk_integrity_compare(struct gendisk
*a
, struct gendisk
*b
)
1526 static inline int blk_integrity_register(struct gendisk
*d
,
1527 struct blk_integrity
*b
)
1531 static inline void blk_integrity_unregister(struct gendisk
*d
)
1534 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1538 static inline unsigned short queue_max_integrity_segments(struct request_queue
*q
)
1542 static inline int blk_integrity_merge_rq(struct request_queue
*rq
,
1548 static inline int blk_integrity_merge_bio(struct request_queue
*rq
,
1554 static inline bool blk_integrity_is_initialized(struct gendisk
*g
)
1559 #endif /* CONFIG_BLK_DEV_INTEGRITY */
1561 struct block_device_operations
{
1562 int (*open
) (struct block_device
*, fmode_t
);
1563 void (*release
) (struct gendisk
*, fmode_t
);
1564 int (*ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1565 int (*compat_ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1566 int (*direct_access
) (struct block_device
*, sector_t
,
1567 void **, unsigned long *);
1568 unsigned int (*check_events
) (struct gendisk
*disk
,
1569 unsigned int clearing
);
1570 /* ->media_changed() is DEPRECATED, use ->check_events() instead */
1571 int (*media_changed
) (struct gendisk
*);
1572 void (*unlock_native_capacity
) (struct gendisk
*);
1573 int (*revalidate_disk
) (struct gendisk
*);
1574 int (*getgeo
)(struct block_device
*, struct hd_geometry
*);
1575 /* this callback is with swap_lock and sometimes page table lock held */
1576 void (*swap_slot_free_notify
) (struct block_device
*, unsigned long);
1577 struct module
*owner
;
1580 extern int __blkdev_driver_ioctl(struct block_device
*, fmode_t
, unsigned int,
1582 #else /* CONFIG_BLOCK */
1584 * stubs for when the block layer is configured out
1586 #define buffer_heads_over_limit 0
1588 static inline long nr_blockdev_pages(void)
1596 static inline void blk_start_plug(struct blk_plug
*plug
)
1600 static inline void blk_finish_plug(struct blk_plug
*plug
)
1604 static inline void blk_flush_plug(struct task_struct
*task
)
1608 static inline void blk_schedule_flush_plug(struct task_struct
*task
)
1613 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1618 #endif /* CONFIG_BLOCK */