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()
98 struct list_head queuelist
;
100 struct call_single_data csd
;
101 struct work_struct mq_flush_work
;
104 struct request_queue
*q
;
105 struct blk_mq_ctx
*mq_ctx
;
108 enum rq_cmd_type_bits cmd_type
;
109 unsigned long atomic_flags
;
113 /* the following two fields are internal, NEVER access directly */
114 unsigned int __data_len
; /* total data len */
115 sector_t __sector
; /* sector cursor */
120 struct hlist_node hash
; /* merge hash */
122 * The rb_node is only used inside the io scheduler, requests
123 * are pruned when moved to the dispatch queue. So let the
124 * completion_data share space with the rb_node.
127 struct rb_node rb_node
; /* sort/lookup */
128 void *completion_data
;
132 * Three pointers are available for the IO schedulers, if they need
133 * more they have to dynamically allocate it. Flush requests are
134 * never put on the IO scheduler. So let the flush fields share
135 * space with the elevator data.
145 struct list_head list
;
146 rq_end_io_fn
*saved_end_io
;
150 struct gendisk
*rq_disk
;
151 struct hd_struct
*part
;
152 unsigned long start_time
;
153 #ifdef CONFIG_BLK_CGROUP
154 struct request_list
*rl
; /* rl this rq is alloced from */
155 unsigned long long start_time_ns
;
156 unsigned long long io_start_time_ns
; /* when passed to hardware */
158 /* Number of scatter-gather DMA addr+len pairs after
159 * physical address coalescing is performed.
161 unsigned short nr_phys_segments
;
162 #if defined(CONFIG_BLK_DEV_INTEGRITY)
163 unsigned short nr_integrity_segments
;
166 unsigned short ioprio
;
168 void *special
; /* opaque pointer available for LLD use */
169 char *buffer
; /* kaddr of the current segment if available */
175 * when request is used as a packet command carrier
177 unsigned char __cmd
[BLK_MAX_CDB
];
179 unsigned short cmd_len
;
181 unsigned int extra_len
; /* length of alignment and padding */
182 unsigned int sense_len
;
183 unsigned int resid_len
; /* residual count */
186 unsigned long deadline
;
187 struct list_head timeout_list
;
188 unsigned int timeout
;
192 * completion callback.
194 rq_end_io_fn
*end_io
;
198 struct request
*next_rq
;
201 static inline unsigned short req_get_ioprio(struct request
*req
)
207 * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME
208 * requests. Some step values could eventually be made generic.
210 struct request_pm_state
212 /* PM state machine step value, currently driver specific */
214 /* requested PM state value (S1, S2, S3, S4, ...) */
216 void* data
; /* for driver use */
219 #include <linux/elevator.h>
221 struct blk_queue_ctx
;
223 typedef void (request_fn_proc
) (struct request_queue
*q
);
224 typedef void (make_request_fn
) (struct request_queue
*q
, struct bio
*bio
);
225 typedef int (prep_rq_fn
) (struct request_queue
*, struct request
*);
226 typedef void (unprep_rq_fn
) (struct request_queue
*, struct request
*);
229 struct bvec_merge_data
{
230 struct block_device
*bi_bdev
;
235 typedef int (merge_bvec_fn
) (struct request_queue
*, struct bvec_merge_data
*,
237 typedef void (softirq_done_fn
)(struct request
*);
238 typedef int (dma_drain_needed_fn
)(struct request
*);
239 typedef int (lld_busy_fn
) (struct request_queue
*q
);
240 typedef int (bsg_job_fn
) (struct bsg_job
*);
242 enum blk_eh_timer_return
{
248 typedef enum blk_eh_timer_return (rq_timed_out_fn
)(struct request
*);
250 enum blk_queue_state
{
255 struct blk_queue_tag
{
256 struct request
**tag_index
; /* map of busy tags */
257 unsigned long *tag_map
; /* bit map of free/busy tags */
258 int busy
; /* current depth */
259 int max_depth
; /* what we will send to device */
260 int real_max_depth
; /* what the array can hold */
261 atomic_t refcnt
; /* map can be shared */
264 #define BLK_SCSI_MAX_CMDS (256)
265 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
267 struct queue_limits
{
268 unsigned long bounce_pfn
;
269 unsigned long seg_boundary_mask
;
271 unsigned int max_hw_sectors
;
272 unsigned int max_sectors
;
273 unsigned int max_segment_size
;
274 unsigned int physical_block_size
;
275 unsigned int alignment_offset
;
278 unsigned int max_discard_sectors
;
279 unsigned int max_write_same_sectors
;
280 unsigned int discard_granularity
;
281 unsigned int discard_alignment
;
283 unsigned short logical_block_size
;
284 unsigned short max_segments
;
285 unsigned short max_integrity_segments
;
287 unsigned char misaligned
;
288 unsigned char discard_misaligned
;
289 unsigned char cluster
;
290 unsigned char discard_zeroes_data
;
291 unsigned char raid_partial_stripes_expensive
;
294 struct request_queue
{
296 * Together with queue_head for cacheline sharing
298 struct list_head queue_head
;
299 struct request
*last_merge
;
300 struct elevator_queue
*elevator
;
301 int nr_rqs
[2]; /* # allocated [a]sync rqs */
302 int nr_rqs_elvpriv
; /* # allocated rqs w/ elvpriv */
305 * If blkcg is not used, @q->root_rl serves all requests. If blkcg
306 * is used, root blkg allocates from @q->root_rl and all other
307 * blkgs from their own blkg->rl. Which one to use should be
308 * determined using bio_request_list().
310 struct request_list root_rl
;
312 request_fn_proc
*request_fn
;
313 make_request_fn
*make_request_fn
;
314 prep_rq_fn
*prep_rq_fn
;
315 unprep_rq_fn
*unprep_rq_fn
;
316 merge_bvec_fn
*merge_bvec_fn
;
317 softirq_done_fn
*softirq_done_fn
;
318 rq_timed_out_fn
*rq_timed_out_fn
;
319 dma_drain_needed_fn
*dma_drain_needed
;
320 lld_busy_fn
*lld_busy_fn
;
322 struct blk_mq_ops
*mq_ops
;
324 unsigned int *mq_map
;
327 struct blk_mq_ctx
*queue_ctx
;
328 unsigned int nr_queues
;
330 /* hw dispatch queues */
331 struct blk_mq_hw_ctx
**queue_hw_ctx
;
332 unsigned int nr_hw_queues
;
335 * Dispatch queue sorting
338 struct request
*boundary_rq
;
341 * Delayed queue handling
343 struct delayed_work delay_work
;
345 struct backing_dev_info backing_dev_info
;
348 * The queue owner gets to use this for whatever they like.
349 * ll_rw_blk doesn't touch it.
354 * various queue flags, see QUEUE_* below
356 unsigned long queue_flags
;
359 * ida allocated id for this queue. Used to index queues from
365 * queue needs bounce pages for pages above this limit
370 * protects queue structures from reentrancy. ->__queue_lock should
371 * _never_ be used directly, it is queue private. always use
374 spinlock_t __queue_lock
;
375 spinlock_t
*queue_lock
;
385 struct kobject mq_kobj
;
387 #ifdef CONFIG_PM_RUNTIME
390 unsigned int nr_pending
;
396 unsigned long nr_requests
; /* Max # of requests */
397 unsigned int nr_congestion_on
;
398 unsigned int nr_congestion_off
;
399 unsigned int nr_batching
;
401 unsigned int dma_drain_size
;
402 void *dma_drain_buffer
;
403 unsigned int dma_pad_mask
;
404 unsigned int dma_alignment
;
406 struct blk_queue_tag
*queue_tags
;
407 struct list_head tag_busy_list
;
409 unsigned int nr_sorted
;
410 unsigned int in_flight
[2];
412 * Number of active block driver functions for which blk_drain_queue()
413 * must wait. Must be incremented around functions that unlock the
414 * queue_lock internally, e.g. scsi_request_fn().
416 unsigned int request_fn_active
;
418 unsigned int rq_timeout
;
419 struct timer_list timeout
;
420 struct list_head timeout_list
;
422 struct list_head icq_list
;
423 #ifdef CONFIG_BLK_CGROUP
424 DECLARE_BITMAP (blkcg_pols
, BLKCG_MAX_POLS
);
425 struct blkcg_gq
*root_blkg
;
426 struct list_head blkg_list
;
429 struct queue_limits limits
;
434 unsigned int sg_timeout
;
435 unsigned int sg_reserved_size
;
437 #ifdef CONFIG_BLK_DEV_IO_TRACE
438 struct blk_trace
*blk_trace
;
441 * for flush operations
443 unsigned int flush_flags
;
444 unsigned int flush_not_queueable
:1;
445 unsigned int flush_queue_delayed
:1;
446 unsigned int flush_pending_idx
:1;
447 unsigned int flush_running_idx
:1;
448 unsigned long flush_pending_since
;
449 struct list_head flush_queue
[2];
450 struct list_head flush_data_in_flight
;
451 struct request
*flush_rq
;
452 spinlock_t mq_flush_lock
;
454 struct mutex sysfs_lock
;
458 #if defined(CONFIG_BLK_DEV_BSG)
459 bsg_job_fn
*bsg_job_fn
;
461 struct bsg_class_device bsg_dev
;
464 #ifdef CONFIG_BLK_DEV_THROTTLING
466 struct throtl_data
*td
;
468 struct rcu_head rcu_head
;
469 wait_queue_head_t mq_freeze_wq
;
470 struct percpu_counter mq_usage_counter
;
471 struct list_head all_q_node
;
474 #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */
475 #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */
476 #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */
477 #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */
478 #define QUEUE_FLAG_DYING 5 /* queue being torn down */
479 #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */
480 #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */
481 #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */
482 #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */
483 #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */
484 #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */
485 #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */
486 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
487 #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */
488 #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */
489 #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */
490 #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */
491 #define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */
492 #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */
493 #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */
494 #define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */
496 #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
497 (1 << QUEUE_FLAG_STACKABLE) | \
498 (1 << QUEUE_FLAG_SAME_COMP) | \
499 (1 << QUEUE_FLAG_ADD_RANDOM))
501 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
502 (1 << QUEUE_FLAG_SAME_COMP))
504 static inline void queue_lockdep_assert_held(struct request_queue
*q
)
507 lockdep_assert_held(q
->queue_lock
);
510 static inline void queue_flag_set_unlocked(unsigned int flag
,
511 struct request_queue
*q
)
513 __set_bit(flag
, &q
->queue_flags
);
516 static inline int queue_flag_test_and_clear(unsigned int flag
,
517 struct request_queue
*q
)
519 queue_lockdep_assert_held(q
);
521 if (test_bit(flag
, &q
->queue_flags
)) {
522 __clear_bit(flag
, &q
->queue_flags
);
529 static inline int queue_flag_test_and_set(unsigned int flag
,
530 struct request_queue
*q
)
532 queue_lockdep_assert_held(q
);
534 if (!test_bit(flag
, &q
->queue_flags
)) {
535 __set_bit(flag
, &q
->queue_flags
);
542 static inline void queue_flag_set(unsigned int flag
, struct request_queue
*q
)
544 queue_lockdep_assert_held(q
);
545 __set_bit(flag
, &q
->queue_flags
);
548 static inline void queue_flag_clear_unlocked(unsigned int flag
,
549 struct request_queue
*q
)
551 __clear_bit(flag
, &q
->queue_flags
);
554 static inline int queue_in_flight(struct request_queue
*q
)
556 return q
->in_flight
[0] + q
->in_flight
[1];
559 static inline void queue_flag_clear(unsigned int flag
, struct request_queue
*q
)
561 queue_lockdep_assert_held(q
);
562 __clear_bit(flag
, &q
->queue_flags
);
565 #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
566 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
567 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
568 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
569 #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags)
570 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
571 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
572 #define blk_queue_noxmerges(q) \
573 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
574 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
575 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
576 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
577 #define blk_queue_stackable(q) \
578 test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
579 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
580 #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \
581 test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags))
583 #define blk_noretry_request(rq) \
584 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
585 REQ_FAILFAST_DRIVER))
587 #define blk_account_rq(rq) \
588 (((rq)->cmd_flags & REQ_STARTED) && \
589 ((rq)->cmd_type == REQ_TYPE_FS))
591 #define blk_pm_request(rq) \
592 ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \
593 (rq)->cmd_type == REQ_TYPE_PM_RESUME)
595 #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
596 #define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
597 /* rq->queuelist of dequeued request must be list_empty() */
598 #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
600 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
602 #define rq_data_dir(rq) (((rq)->cmd_flags & 1) != 0)
604 static inline unsigned int blk_queue_cluster(struct request_queue
*q
)
606 return q
->limits
.cluster
;
610 * We regard a request as sync, if either a read or a sync write
612 static inline bool rw_is_sync(unsigned int rw_flags
)
614 return !(rw_flags
& REQ_WRITE
) || (rw_flags
& REQ_SYNC
);
617 static inline bool rq_is_sync(struct request
*rq
)
619 return rw_is_sync(rq
->cmd_flags
);
622 static inline bool blk_rl_full(struct request_list
*rl
, bool sync
)
624 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
626 return rl
->flags
& flag
;
629 static inline void blk_set_rl_full(struct request_list
*rl
, bool sync
)
631 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
636 static inline void blk_clear_rl_full(struct request_list
*rl
, bool sync
)
638 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
643 static inline bool rq_mergeable(struct request
*rq
)
645 if (rq
->cmd_type
!= REQ_TYPE_FS
)
648 if (rq
->cmd_flags
& REQ_NOMERGE_FLAGS
)
654 static inline bool blk_check_merge_flags(unsigned int flags1
,
657 if ((flags1
& REQ_DISCARD
) != (flags2
& REQ_DISCARD
))
660 if ((flags1
& REQ_SECURE
) != (flags2
& REQ_SECURE
))
663 if ((flags1
& REQ_WRITE_SAME
) != (flags2
& REQ_WRITE_SAME
))
669 static inline bool blk_write_same_mergeable(struct bio
*a
, struct bio
*b
)
671 if (bio_data(a
) == bio_data(b
))
678 * q->prep_rq_fn return values
680 #define BLKPREP_OK 0 /* serve it */
681 #define BLKPREP_KILL 1 /* fatal error, kill */
682 #define BLKPREP_DEFER 2 /* leave on queue */
684 extern unsigned long blk_max_low_pfn
, blk_max_pfn
;
687 * standard bounce addresses:
689 * BLK_BOUNCE_HIGH : bounce all highmem pages
690 * BLK_BOUNCE_ANY : don't bounce anything
691 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
694 #if BITS_PER_LONG == 32
695 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
697 #define BLK_BOUNCE_HIGH -1ULL
699 #define BLK_BOUNCE_ANY (-1ULL)
700 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
703 * default timeout for SG_IO if none specified
705 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
706 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
709 extern int init_emergency_isa_pool(void);
710 extern void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
);
712 static inline int init_emergency_isa_pool(void)
716 static inline void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
)
719 #endif /* CONFIG_MMU */
725 unsigned long offset
;
730 struct req_iterator
{
731 struct bvec_iter iter
;
735 /* This should not be used directly - use rq_for_each_segment */
736 #define for_each_bio(_bio) \
737 for (; _bio; _bio = _bio->bi_next)
738 #define __rq_for_each_bio(_bio, rq) \
740 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
742 #define rq_for_each_segment(bvl, _rq, _iter) \
743 __rq_for_each_bio(_iter.bio, _rq) \
744 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
746 #define rq_iter_last(bvec, _iter) \
747 (_iter.bio->bi_next == NULL && \
748 bio_iter_last(bvec, _iter.iter))
750 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
751 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
753 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
754 extern void rq_flush_dcache_pages(struct request
*rq
);
756 static inline void rq_flush_dcache_pages(struct request
*rq
)
761 extern int blk_register_queue(struct gendisk
*disk
);
762 extern void blk_unregister_queue(struct gendisk
*disk
);
763 extern void generic_make_request(struct bio
*bio
);
764 extern void blk_rq_init(struct request_queue
*q
, struct request
*rq
);
765 extern void blk_put_request(struct request
*);
766 extern void __blk_put_request(struct request_queue
*, struct request
*);
767 extern struct request
*blk_get_request(struct request_queue
*, int, gfp_t
);
768 extern struct request
*blk_make_request(struct request_queue
*, struct bio
*,
770 extern void blk_requeue_request(struct request_queue
*, struct request
*);
771 extern void blk_add_request_payload(struct request
*rq
, struct page
*page
,
773 extern int blk_rq_check_limits(struct request_queue
*q
, struct request
*rq
);
774 extern int blk_lld_busy(struct request_queue
*q
);
775 extern int blk_rq_prep_clone(struct request
*rq
, struct request
*rq_src
,
776 struct bio_set
*bs
, gfp_t gfp_mask
,
777 int (*bio_ctr
)(struct bio
*, struct bio
*, void *),
779 extern void blk_rq_unprep_clone(struct request
*rq
);
780 extern int blk_insert_cloned_request(struct request_queue
*q
,
782 extern void blk_delay_queue(struct request_queue
*, unsigned long);
783 extern void blk_recount_segments(struct request_queue
*, struct bio
*);
784 extern int scsi_verify_blk_ioctl(struct block_device
*, unsigned int);
785 extern int scsi_cmd_blk_ioctl(struct block_device
*, fmode_t
,
786 unsigned int, void __user
*);
787 extern int scsi_cmd_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
788 unsigned int, void __user
*);
789 extern int sg_scsi_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
790 struct scsi_ioctl_command __user
*);
792 extern void blk_queue_bio(struct request_queue
*q
, struct bio
*bio
);
795 * A queue has just exitted congestion. Note this in the global counter of
796 * congested queues, and wake up anyone who was waiting for requests to be
799 static inline void blk_clear_queue_congested(struct request_queue
*q
, int sync
)
801 clear_bdi_congested(&q
->backing_dev_info
, sync
);
805 * A queue has just entered congestion. Flag that in the queue's VM-visible
806 * state flags and increment the global gounter of congested queues.
808 static inline void blk_set_queue_congested(struct request_queue
*q
, int sync
)
810 set_bdi_congested(&q
->backing_dev_info
, sync
);
813 extern void blk_start_queue(struct request_queue
*q
);
814 extern void blk_stop_queue(struct request_queue
*q
);
815 extern void blk_sync_queue(struct request_queue
*q
);
816 extern void __blk_stop_queue(struct request_queue
*q
);
817 extern void __blk_run_queue(struct request_queue
*q
);
818 extern void blk_run_queue(struct request_queue
*);
819 extern void blk_run_queue_async(struct request_queue
*q
);
820 extern int blk_rq_map_user(struct request_queue
*, struct request
*,
821 struct rq_map_data
*, void __user
*, unsigned long,
823 extern int blk_rq_unmap_user(struct bio
*);
824 extern int blk_rq_map_kern(struct request_queue
*, struct request
*, void *, unsigned int, gfp_t
);
825 extern int blk_rq_map_user_iov(struct request_queue
*, struct request
*,
826 struct rq_map_data
*, struct sg_iovec
*, int,
827 unsigned int, gfp_t
);
828 extern int blk_execute_rq(struct request_queue
*, struct gendisk
*,
829 struct request
*, int);
830 extern void blk_execute_rq_nowait(struct request_queue
*, struct gendisk
*,
831 struct request
*, int, rq_end_io_fn
*);
833 static inline struct request_queue
*bdev_get_queue(struct block_device
*bdev
)
835 return bdev
->bd_disk
->queue
;
839 * blk_rq_pos() : the current sector
840 * blk_rq_bytes() : bytes left in the entire request
841 * blk_rq_cur_bytes() : bytes left in the current segment
842 * blk_rq_err_bytes() : bytes left till the next error boundary
843 * blk_rq_sectors() : sectors left in the entire request
844 * blk_rq_cur_sectors() : sectors left in the current segment
846 static inline sector_t
blk_rq_pos(const struct request
*rq
)
851 static inline unsigned int blk_rq_bytes(const struct request
*rq
)
853 return rq
->__data_len
;
856 static inline int blk_rq_cur_bytes(const struct request
*rq
)
858 return rq
->bio
? bio_cur_bytes(rq
->bio
) : 0;
861 extern unsigned int blk_rq_err_bytes(const struct request
*rq
);
863 static inline unsigned int blk_rq_sectors(const struct request
*rq
)
865 return blk_rq_bytes(rq
) >> 9;
868 static inline unsigned int blk_rq_cur_sectors(const struct request
*rq
)
870 return blk_rq_cur_bytes(rq
) >> 9;
873 static inline unsigned int blk_queue_get_max_sectors(struct request_queue
*q
,
874 unsigned int cmd_flags
)
876 if (unlikely(cmd_flags
& REQ_DISCARD
))
877 return min(q
->limits
.max_discard_sectors
, UINT_MAX
>> 9);
879 if (unlikely(cmd_flags
& REQ_WRITE_SAME
))
880 return q
->limits
.max_write_same_sectors
;
882 return q
->limits
.max_sectors
;
885 static inline unsigned int blk_rq_get_max_sectors(struct request
*rq
)
887 struct request_queue
*q
= rq
->q
;
889 if (unlikely(rq
->cmd_type
== REQ_TYPE_BLOCK_PC
))
890 return q
->limits
.max_hw_sectors
;
892 return blk_queue_get_max_sectors(q
, rq
->cmd_flags
);
895 static inline unsigned int blk_rq_count_bios(struct request
*rq
)
897 unsigned int nr_bios
= 0;
900 __rq_for_each_bio(bio
, rq
)
907 * Request issue related functions.
909 extern struct request
*blk_peek_request(struct request_queue
*q
);
910 extern void blk_start_request(struct request
*rq
);
911 extern struct request
*blk_fetch_request(struct request_queue
*q
);
914 * Request completion related functions.
916 * blk_update_request() completes given number of bytes and updates
917 * the request without completing it.
919 * blk_end_request() and friends. __blk_end_request() must be called
920 * with the request queue spinlock acquired.
922 * Several drivers define their own end_request and call
923 * blk_end_request() for parts of the original function.
924 * This prevents code duplication in drivers.
926 extern bool blk_update_request(struct request
*rq
, int error
,
927 unsigned int nr_bytes
);
928 extern bool blk_end_request(struct request
*rq
, int error
,
929 unsigned int nr_bytes
);
930 extern void blk_end_request_all(struct request
*rq
, int error
);
931 extern bool blk_end_request_cur(struct request
*rq
, int error
);
932 extern bool blk_end_request_err(struct request
*rq
, int error
);
933 extern bool __blk_end_request(struct request
*rq
, int error
,
934 unsigned int nr_bytes
);
935 extern void __blk_end_request_all(struct request
*rq
, int error
);
936 extern bool __blk_end_request_cur(struct request
*rq
, int error
);
937 extern bool __blk_end_request_err(struct request
*rq
, int error
);
939 extern void blk_complete_request(struct request
*);
940 extern void __blk_complete_request(struct request
*);
941 extern void blk_abort_request(struct request
*);
942 extern void blk_unprep_request(struct request
*);
945 * Access functions for manipulating queue properties
947 extern struct request_queue
*blk_init_queue_node(request_fn_proc
*rfn
,
948 spinlock_t
*lock
, int node_id
);
949 extern struct request_queue
*blk_init_queue(request_fn_proc
*, spinlock_t
*);
950 extern struct request_queue
*blk_init_allocated_queue(struct request_queue
*,
951 request_fn_proc
*, spinlock_t
*);
952 extern void blk_cleanup_queue(struct request_queue
*);
953 extern void blk_queue_make_request(struct request_queue
*, make_request_fn
*);
954 extern void blk_queue_bounce_limit(struct request_queue
*, u64
);
955 extern void blk_limits_max_hw_sectors(struct queue_limits
*, unsigned int);
956 extern void blk_queue_max_hw_sectors(struct request_queue
*, unsigned int);
957 extern void blk_queue_max_segments(struct request_queue
*, unsigned short);
958 extern void blk_queue_max_segment_size(struct request_queue
*, unsigned int);
959 extern void blk_queue_max_discard_sectors(struct request_queue
*q
,
960 unsigned int max_discard_sectors
);
961 extern void blk_queue_max_write_same_sectors(struct request_queue
*q
,
962 unsigned int max_write_same_sectors
);
963 extern void blk_queue_logical_block_size(struct request_queue
*, unsigned short);
964 extern void blk_queue_physical_block_size(struct request_queue
*, unsigned int);
965 extern void blk_queue_alignment_offset(struct request_queue
*q
,
966 unsigned int alignment
);
967 extern void blk_limits_io_min(struct queue_limits
*limits
, unsigned int min
);
968 extern void blk_queue_io_min(struct request_queue
*q
, unsigned int min
);
969 extern void blk_limits_io_opt(struct queue_limits
*limits
, unsigned int opt
);
970 extern void blk_queue_io_opt(struct request_queue
*q
, unsigned int opt
);
971 extern void blk_set_default_limits(struct queue_limits
*lim
);
972 extern void blk_set_stacking_limits(struct queue_limits
*lim
);
973 extern int blk_stack_limits(struct queue_limits
*t
, struct queue_limits
*b
,
975 extern int bdev_stack_limits(struct queue_limits
*t
, struct block_device
*bdev
,
977 extern void disk_stack_limits(struct gendisk
*disk
, struct block_device
*bdev
,
979 extern void blk_queue_stack_limits(struct request_queue
*t
, struct request_queue
*b
);
980 extern void blk_queue_dma_pad(struct request_queue
*, unsigned int);
981 extern void blk_queue_update_dma_pad(struct request_queue
*, unsigned int);
982 extern int blk_queue_dma_drain(struct request_queue
*q
,
983 dma_drain_needed_fn
*dma_drain_needed
,
984 void *buf
, unsigned int size
);
985 extern void blk_queue_lld_busy(struct request_queue
*q
, lld_busy_fn
*fn
);
986 extern void blk_queue_segment_boundary(struct request_queue
*, unsigned long);
987 extern void blk_queue_prep_rq(struct request_queue
*, prep_rq_fn
*pfn
);
988 extern void blk_queue_unprep_rq(struct request_queue
*, unprep_rq_fn
*ufn
);
989 extern void blk_queue_merge_bvec(struct request_queue
*, merge_bvec_fn
*);
990 extern void blk_queue_dma_alignment(struct request_queue
*, int);
991 extern void blk_queue_update_dma_alignment(struct request_queue
*, int);
992 extern void blk_queue_softirq_done(struct request_queue
*, softirq_done_fn
*);
993 extern void blk_queue_rq_timed_out(struct request_queue
*, rq_timed_out_fn
*);
994 extern void blk_queue_rq_timeout(struct request_queue
*, unsigned int);
995 extern void blk_queue_flush(struct request_queue
*q
, unsigned int flush
);
996 extern void blk_queue_flush_queueable(struct request_queue
*q
, bool queueable
);
997 extern struct backing_dev_info
*blk_get_backing_dev_info(struct block_device
*bdev
);
999 extern int blk_rq_map_sg(struct request_queue
*, struct request
*, struct scatterlist
*);
1000 extern int blk_bio_map_sg(struct request_queue
*q
, struct bio
*bio
,
1001 struct scatterlist
*sglist
);
1002 extern void blk_dump_rq_flags(struct request
*, char *);
1003 extern long nr_blockdev_pages(void);
1005 bool __must_check
blk_get_queue(struct request_queue
*);
1006 struct request_queue
*blk_alloc_queue(gfp_t
);
1007 struct request_queue
*blk_alloc_queue_node(gfp_t
, int);
1008 extern void blk_put_queue(struct request_queue
*);
1011 * block layer runtime pm functions
1013 #ifdef CONFIG_PM_RUNTIME
1014 extern void blk_pm_runtime_init(struct request_queue
*q
, struct device
*dev
);
1015 extern int blk_pre_runtime_suspend(struct request_queue
*q
);
1016 extern void blk_post_runtime_suspend(struct request_queue
*q
, int err
);
1017 extern void blk_pre_runtime_resume(struct request_queue
*q
);
1018 extern void blk_post_runtime_resume(struct request_queue
*q
, int err
);
1020 static inline void blk_pm_runtime_init(struct request_queue
*q
,
1021 struct device
*dev
) {}
1022 static inline int blk_pre_runtime_suspend(struct request_queue
*q
)
1026 static inline void blk_post_runtime_suspend(struct request_queue
*q
, int err
) {}
1027 static inline void blk_pre_runtime_resume(struct request_queue
*q
) {}
1028 static inline void blk_post_runtime_resume(struct request_queue
*q
, int err
) {}
1032 * blk_plug permits building a queue of related requests by holding the I/O
1033 * fragments for a short period. This allows merging of sequential requests
1034 * into single larger request. As the requests are moved from a per-task list to
1035 * the device's request_queue in a batch, this results in improved scalability
1036 * as the lock contention for request_queue lock is reduced.
1038 * It is ok not to disable preemption when adding the request to the plug list
1039 * or when attempting a merge, because blk_schedule_flush_list() will only flush
1040 * the plug list when the task sleeps by itself. For details, please see
1041 * schedule() where blk_schedule_flush_plug() is called.
1044 unsigned long magic
; /* detect uninitialized use-cases */
1045 struct list_head list
; /* requests */
1046 struct list_head mq_list
; /* blk-mq requests */
1047 struct list_head cb_list
; /* md requires an unplug callback */
1049 #define BLK_MAX_REQUEST_COUNT 16
1052 typedef void (*blk_plug_cb_fn
)(struct blk_plug_cb
*, bool);
1053 struct blk_plug_cb
{
1054 struct list_head list
;
1055 blk_plug_cb_fn callback
;
1058 extern struct blk_plug_cb
*blk_check_plugged(blk_plug_cb_fn unplug
,
1059 void *data
, int size
);
1060 extern void blk_start_plug(struct blk_plug
*);
1061 extern void blk_finish_plug(struct blk_plug
*);
1062 extern void blk_flush_plug_list(struct blk_plug
*, bool);
1064 static inline void blk_flush_plug(struct task_struct
*tsk
)
1066 struct blk_plug
*plug
= tsk
->plug
;
1069 blk_flush_plug_list(plug
, false);
1072 static inline void blk_schedule_flush_plug(struct task_struct
*tsk
)
1074 struct blk_plug
*plug
= tsk
->plug
;
1077 blk_flush_plug_list(plug
, true);
1080 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1082 struct blk_plug
*plug
= tsk
->plug
;
1085 (!list_empty(&plug
->list
) ||
1086 !list_empty(&plug
->mq_list
) ||
1087 !list_empty(&plug
->cb_list
));
1093 #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED)
1094 extern int blk_queue_start_tag(struct request_queue
*, struct request
*);
1095 extern struct request
*blk_queue_find_tag(struct request_queue
*, int);
1096 extern void blk_queue_end_tag(struct request_queue
*, struct request
*);
1097 extern int blk_queue_init_tags(struct request_queue
*, int, struct blk_queue_tag
*);
1098 extern void blk_queue_free_tags(struct request_queue
*);
1099 extern int blk_queue_resize_tags(struct request_queue
*, int);
1100 extern void blk_queue_invalidate_tags(struct request_queue
*);
1101 extern struct blk_queue_tag
*blk_init_tags(int);
1102 extern void blk_free_tags(struct blk_queue_tag
*);
1104 static inline struct request
*blk_map_queue_find_tag(struct blk_queue_tag
*bqt
,
1107 if (unlikely(bqt
== NULL
|| tag
>= bqt
->real_max_depth
))
1109 return bqt
->tag_index
[tag
];
1112 #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */
1114 extern int blkdev_issue_flush(struct block_device
*, gfp_t
, sector_t
*);
1115 extern int blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1116 sector_t nr_sects
, gfp_t gfp_mask
, unsigned long flags
);
1117 extern int blkdev_issue_write_same(struct block_device
*bdev
, sector_t sector
,
1118 sector_t nr_sects
, gfp_t gfp_mask
, struct page
*page
);
1119 extern int blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1120 sector_t nr_sects
, gfp_t gfp_mask
);
1121 static inline int sb_issue_discard(struct super_block
*sb
, sector_t block
,
1122 sector_t nr_blocks
, gfp_t gfp_mask
, unsigned long flags
)
1124 return blkdev_issue_discard(sb
->s_bdev
, block
<< (sb
->s_blocksize_bits
- 9),
1125 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1128 static inline int sb_issue_zeroout(struct super_block
*sb
, sector_t block
,
1129 sector_t nr_blocks
, gfp_t gfp_mask
)
1131 return blkdev_issue_zeroout(sb
->s_bdev
,
1132 block
<< (sb
->s_blocksize_bits
- 9),
1133 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1137 extern int blk_verify_command(unsigned char *cmd
, fmode_t has_write_perm
);
1139 enum blk_default_limits
{
1140 BLK_MAX_SEGMENTS
= 128,
1141 BLK_SAFE_MAX_SECTORS
= 255,
1142 BLK_DEF_MAX_SECTORS
= 1024,
1143 BLK_MAX_SEGMENT_SIZE
= 65536,
1144 BLK_SEG_BOUNDARY_MASK
= 0xFFFFFFFFUL
,
1147 #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
1149 static inline unsigned long queue_bounce_pfn(struct request_queue
*q
)
1151 return q
->limits
.bounce_pfn
;
1154 static inline unsigned long queue_segment_boundary(struct request_queue
*q
)
1156 return q
->limits
.seg_boundary_mask
;
1159 static inline unsigned int queue_max_sectors(struct request_queue
*q
)
1161 return q
->limits
.max_sectors
;
1164 static inline unsigned int queue_max_hw_sectors(struct request_queue
*q
)
1166 return q
->limits
.max_hw_sectors
;
1169 static inline unsigned short queue_max_segments(struct request_queue
*q
)
1171 return q
->limits
.max_segments
;
1174 static inline unsigned int queue_max_segment_size(struct request_queue
*q
)
1176 return q
->limits
.max_segment_size
;
1179 static inline unsigned short queue_logical_block_size(struct request_queue
*q
)
1183 if (q
&& q
->limits
.logical_block_size
)
1184 retval
= q
->limits
.logical_block_size
;
1189 static inline unsigned short bdev_logical_block_size(struct block_device
*bdev
)
1191 return queue_logical_block_size(bdev_get_queue(bdev
));
1194 static inline unsigned int queue_physical_block_size(struct request_queue
*q
)
1196 return q
->limits
.physical_block_size
;
1199 static inline unsigned int bdev_physical_block_size(struct block_device
*bdev
)
1201 return queue_physical_block_size(bdev_get_queue(bdev
));
1204 static inline unsigned int queue_io_min(struct request_queue
*q
)
1206 return q
->limits
.io_min
;
1209 static inline int bdev_io_min(struct block_device
*bdev
)
1211 return queue_io_min(bdev_get_queue(bdev
));
1214 static inline unsigned int queue_io_opt(struct request_queue
*q
)
1216 return q
->limits
.io_opt
;
1219 static inline int bdev_io_opt(struct block_device
*bdev
)
1221 return queue_io_opt(bdev_get_queue(bdev
));
1224 static inline int queue_alignment_offset(struct request_queue
*q
)
1226 if (q
->limits
.misaligned
)
1229 return q
->limits
.alignment_offset
;
1232 static inline int queue_limit_alignment_offset(struct queue_limits
*lim
, sector_t sector
)
1234 unsigned int granularity
= max(lim
->physical_block_size
, lim
->io_min
);
1235 unsigned int alignment
= (sector
<< 9) & (granularity
- 1);
1237 return (granularity
+ lim
->alignment_offset
- alignment
)
1238 & (granularity
- 1);
1241 static inline int bdev_alignment_offset(struct block_device
*bdev
)
1243 struct request_queue
*q
= bdev_get_queue(bdev
);
1245 if (q
->limits
.misaligned
)
1248 if (bdev
!= bdev
->bd_contains
)
1249 return bdev
->bd_part
->alignment_offset
;
1251 return q
->limits
.alignment_offset
;
1254 static inline int queue_discard_alignment(struct request_queue
*q
)
1256 if (q
->limits
.discard_misaligned
)
1259 return q
->limits
.discard_alignment
;
1262 static inline int queue_limit_discard_alignment(struct queue_limits
*lim
, sector_t sector
)
1264 unsigned int alignment
, granularity
, offset
;
1266 if (!lim
->max_discard_sectors
)
1269 /* Why are these in bytes, not sectors? */
1270 alignment
= lim
->discard_alignment
>> 9;
1271 granularity
= lim
->discard_granularity
>> 9;
1275 /* Offset of the partition start in 'granularity' sectors */
1276 offset
= sector_div(sector
, granularity
);
1278 /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1279 offset
= (granularity
+ alignment
- offset
) % granularity
;
1281 /* Turn it back into bytes, gaah */
1285 static inline int bdev_discard_alignment(struct block_device
*bdev
)
1287 struct request_queue
*q
= bdev_get_queue(bdev
);
1289 if (bdev
!= bdev
->bd_contains
)
1290 return bdev
->bd_part
->discard_alignment
;
1292 return q
->limits
.discard_alignment
;
1295 static inline unsigned int queue_discard_zeroes_data(struct request_queue
*q
)
1297 if (q
->limits
.max_discard_sectors
&& q
->limits
.discard_zeroes_data
== 1)
1303 static inline unsigned int bdev_discard_zeroes_data(struct block_device
*bdev
)
1305 return queue_discard_zeroes_data(bdev_get_queue(bdev
));
1308 static inline unsigned int bdev_write_same(struct block_device
*bdev
)
1310 struct request_queue
*q
= bdev_get_queue(bdev
);
1313 return q
->limits
.max_write_same_sectors
;
1318 static inline int queue_dma_alignment(struct request_queue
*q
)
1320 return q
? q
->dma_alignment
: 511;
1323 static inline int blk_rq_aligned(struct request_queue
*q
, unsigned long addr
,
1326 unsigned int alignment
= queue_dma_alignment(q
) | q
->dma_pad_mask
;
1327 return !(addr
& alignment
) && !(len
& alignment
);
1330 /* assumes size > 256 */
1331 static inline unsigned int blksize_bits(unsigned int size
)
1333 unsigned int bits
= 8;
1337 } while (size
> 256);
1341 static inline unsigned int block_size(struct block_device
*bdev
)
1343 return bdev
->bd_block_size
;
1346 static inline bool queue_flush_queueable(struct request_queue
*q
)
1348 return !q
->flush_not_queueable
;
1351 typedef struct {struct page
*v
;} Sector
;
1353 unsigned char *read_dev_sector(struct block_device
*, sector_t
, Sector
*);
1355 static inline void put_dev_sector(Sector p
)
1357 page_cache_release(p
.v
);
1361 int kblockd_schedule_work(struct request_queue
*q
, struct work_struct
*work
);
1362 int kblockd_schedule_delayed_work(struct request_queue
*q
, struct delayed_work
*dwork
, unsigned long delay
);
1364 #ifdef CONFIG_BLK_CGROUP
1366 * This should not be using sched_clock(). A real patch is in progress
1367 * to fix this up, until that is in place we need to disable preemption
1368 * around sched_clock() in this function and set_io_start_time_ns().
1370 static inline void set_start_time_ns(struct request
*req
)
1373 req
->start_time_ns
= sched_clock();
1377 static inline void set_io_start_time_ns(struct request
*req
)
1380 req
->io_start_time_ns
= sched_clock();
1384 static inline uint64_t rq_start_time_ns(struct request
*req
)
1386 return req
->start_time_ns
;
1389 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1391 return req
->io_start_time_ns
;
1394 static inline void set_start_time_ns(struct request
*req
) {}
1395 static inline void set_io_start_time_ns(struct request
*req
) {}
1396 static inline uint64_t rq_start_time_ns(struct request
*req
)
1400 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1406 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1407 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1408 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1409 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1411 #if defined(CONFIG_BLK_DEV_INTEGRITY)
1413 #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */
1414 #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */
1416 struct blk_integrity_exchg
{
1420 unsigned int data_size
;
1421 unsigned short sector_size
;
1422 const char *disk_name
;
1425 typedef void (integrity_gen_fn
) (struct blk_integrity_exchg
*);
1426 typedef int (integrity_vrfy_fn
) (struct blk_integrity_exchg
*);
1427 typedef void (integrity_set_tag_fn
) (void *, void *, unsigned int);
1428 typedef void (integrity_get_tag_fn
) (void *, void *, unsigned int);
1430 struct blk_integrity
{
1431 integrity_gen_fn
*generate_fn
;
1432 integrity_vrfy_fn
*verify_fn
;
1433 integrity_set_tag_fn
*set_tag_fn
;
1434 integrity_get_tag_fn
*get_tag_fn
;
1436 unsigned short flags
;
1437 unsigned short tuple_size
;
1438 unsigned short sector_size
;
1439 unsigned short tag_size
;
1443 struct kobject kobj
;
1446 extern bool blk_integrity_is_initialized(struct gendisk
*);
1447 extern int blk_integrity_register(struct gendisk
*, struct blk_integrity
*);
1448 extern void blk_integrity_unregister(struct gendisk
*);
1449 extern int blk_integrity_compare(struct gendisk
*, struct gendisk
*);
1450 extern int blk_rq_map_integrity_sg(struct request_queue
*, struct bio
*,
1451 struct scatterlist
*);
1452 extern int blk_rq_count_integrity_sg(struct request_queue
*, struct bio
*);
1453 extern int blk_integrity_merge_rq(struct request_queue
*, struct request
*,
1455 extern int blk_integrity_merge_bio(struct request_queue
*, struct request
*,
1459 struct blk_integrity
*bdev_get_integrity(struct block_device
*bdev
)
1461 return bdev
->bd_disk
->integrity
;
1464 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1466 return disk
->integrity
;
1469 static inline int blk_integrity_rq(struct request
*rq
)
1471 if (rq
->bio
== NULL
)
1474 return bio_integrity(rq
->bio
);
1477 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1480 q
->limits
.max_integrity_segments
= segs
;
1483 static inline unsigned short
1484 queue_max_integrity_segments(struct request_queue
*q
)
1486 return q
->limits
.max_integrity_segments
;
1489 #else /* CONFIG_BLK_DEV_INTEGRITY */
1492 struct block_device
;
1494 struct blk_integrity
;
1496 static inline int blk_integrity_rq(struct request
*rq
)
1500 static inline int blk_rq_count_integrity_sg(struct request_queue
*q
,
1505 static inline int blk_rq_map_integrity_sg(struct request_queue
*q
,
1507 struct scatterlist
*s
)
1511 static inline struct blk_integrity
*bdev_get_integrity(struct block_device
*b
)
1515 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1519 static inline int blk_integrity_compare(struct gendisk
*a
, struct gendisk
*b
)
1523 static inline int blk_integrity_register(struct gendisk
*d
,
1524 struct blk_integrity
*b
)
1528 static inline void blk_integrity_unregister(struct gendisk
*d
)
1531 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1535 static inline unsigned short queue_max_integrity_segments(struct request_queue
*q
)
1539 static inline int blk_integrity_merge_rq(struct request_queue
*rq
,
1545 static inline int blk_integrity_merge_bio(struct request_queue
*rq
,
1551 static inline bool blk_integrity_is_initialized(struct gendisk
*g
)
1556 #endif /* CONFIG_BLK_DEV_INTEGRITY */
1558 struct block_device_operations
{
1559 int (*open
) (struct block_device
*, fmode_t
);
1560 void (*release
) (struct gendisk
*, fmode_t
);
1561 int (*ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1562 int (*compat_ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1563 int (*direct_access
) (struct block_device
*, sector_t
,
1564 void **, unsigned long *);
1565 unsigned int (*check_events
) (struct gendisk
*disk
,
1566 unsigned int clearing
);
1567 /* ->media_changed() is DEPRECATED, use ->check_events() instead */
1568 int (*media_changed
) (struct gendisk
*);
1569 void (*unlock_native_capacity
) (struct gendisk
*);
1570 int (*revalidate_disk
) (struct gendisk
*);
1571 int (*getgeo
)(struct block_device
*, struct hd_geometry
*);
1572 /* this callback is with swap_lock and sometimes page table lock held */
1573 void (*swap_slot_free_notify
) (struct block_device
*, unsigned long);
1574 struct module
*owner
;
1577 extern int __blkdev_driver_ioctl(struct block_device
*, fmode_t
, unsigned int,
1579 #else /* CONFIG_BLOCK */
1581 * stubs for when the block layer is configured out
1583 #define buffer_heads_over_limit 0
1585 static inline long nr_blockdev_pages(void)
1593 static inline void blk_start_plug(struct blk_plug
*plug
)
1597 static inline void blk_finish_plug(struct blk_plug
*plug
)
1601 static inline void blk_flush_plug(struct task_struct
*task
)
1605 static inline void blk_schedule_flush_plug(struct task_struct
*task
)
1610 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1615 #endif /* CONFIG_BLOCK */