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-defs.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>
24 #include <linux/percpu-refcount.h>
25 #include <linux/scatterlist.h>
28 struct scsi_ioctl_command
;
31 struct elevator_queue
;
37 struct blk_flush_queue
;
40 #define BLKDEV_MIN_RQ 4
41 #define BLKDEV_MAX_RQ 128 /* Default maximum */
44 * Maximum number of blkcg policies allowed to be registered concurrently.
45 * Defined here to simplify include dependency.
47 #define BLKCG_MAX_POLS 2
50 typedef void (rq_end_io_fn
)(struct request
*, int);
52 #define BLK_RL_SYNCFULL (1U << 0)
53 #define BLK_RL_ASYNCFULL (1U << 1)
56 struct request_queue
*q
; /* the queue this rl belongs to */
57 #ifdef CONFIG_BLK_CGROUP
58 struct blkcg_gq
*blkg
; /* blkg this request pool belongs to */
61 * count[], starved[], and wait[] are indexed by
62 * BLK_RW_SYNC/BLK_RW_ASYNC
67 wait_queue_head_t wait
[2];
72 * request command types
74 enum rq_cmd_type_bits
{
75 REQ_TYPE_FS
= 1, /* fs request */
76 REQ_TYPE_BLOCK_PC
, /* scsi command */
77 REQ_TYPE_DRV_PRIV
, /* driver defined types from here */
80 #define BLK_MAX_CDB 16
83 * Try to put the fields that are referenced together in the same cacheline.
85 * If you modify this structure, make sure to update blk_rq_init() and
86 * especially blk_mq_rq_ctx_init() to take care of the added fields.
89 struct list_head queuelist
;
91 struct call_single_data csd
;
92 unsigned long fifo_time
;
95 struct request_queue
*q
;
96 struct blk_mq_ctx
*mq_ctx
;
100 unsigned long atomic_flags
;
104 /* the following two fields are internal, NEVER access directly */
105 unsigned int __data_len
; /* total data len */
106 sector_t __sector
; /* sector cursor */
112 * The hash is used inside the scheduler, and killed once the
113 * request reaches the dispatch list. The ipi_list is only used
114 * to queue the request for softirq completion, which is long
115 * after the request has been unhashed (and even removed from
116 * the dispatch list).
119 struct hlist_node hash
; /* merge hash */
120 struct list_head ipi_list
;
124 * The rb_node is only used inside the io scheduler, requests
125 * are pruned when moved to the dispatch queue. So let the
126 * completion_data share space with the rb_node.
129 struct rb_node rb_node
; /* sort/lookup */
130 void *completion_data
;
134 * Three pointers are available for the IO schedulers, if they need
135 * more they have to dynamically allocate it. Flush requests are
136 * never put on the IO scheduler. So let the flush fields share
137 * space with the elevator data.
147 struct list_head list
;
148 rq_end_io_fn
*saved_end_io
;
152 struct gendisk
*rq_disk
;
153 struct hd_struct
*part
;
154 unsigned long start_time
;
155 #ifdef CONFIG_BLK_CGROUP
156 struct request_list
*rl
; /* rl this rq is alloced from */
157 unsigned long long start_time_ns
;
158 unsigned long long io_start_time_ns
; /* when passed to hardware */
160 /* Number of scatter-gather DMA addr+len pairs after
161 * physical address coalescing is performed.
163 unsigned short nr_phys_segments
;
164 #if defined(CONFIG_BLK_DEV_INTEGRITY)
165 unsigned short nr_integrity_segments
;
168 unsigned short ioprio
;
170 void *special
; /* opaque pointer available for LLD use */
176 * when request is used as a packet command carrier
178 unsigned char __cmd
[BLK_MAX_CDB
];
180 unsigned short cmd_len
;
182 unsigned int extra_len
; /* length of alignment and padding */
183 unsigned int sense_len
;
184 unsigned int resid_len
; /* residual count */
187 unsigned long deadline
;
188 struct list_head timeout_list
;
189 unsigned int timeout
;
193 * completion callback.
195 rq_end_io_fn
*end_io
;
199 struct request
*next_rq
;
202 static inline unsigned short req_get_ioprio(struct request
*req
)
207 #include <linux/elevator.h>
209 struct blk_queue_ctx
;
211 typedef void (request_fn_proc
) (struct request_queue
*q
);
212 typedef blk_qc_t (make_request_fn
) (struct request_queue
*q
, struct bio
*bio
);
213 typedef int (prep_rq_fn
) (struct request_queue
*, struct request
*);
214 typedef void (unprep_rq_fn
) (struct request_queue
*, struct request
*);
217 typedef void (softirq_done_fn
)(struct request
*);
218 typedef int (dma_drain_needed_fn
)(struct request
*);
219 typedef int (lld_busy_fn
) (struct request_queue
*q
);
220 typedef int (bsg_job_fn
) (struct bsg_job
*);
222 enum blk_eh_timer_return
{
228 typedef enum blk_eh_timer_return (rq_timed_out_fn
)(struct request
*);
230 enum blk_queue_state
{
235 struct blk_queue_tag
{
236 struct request
**tag_index
; /* map of busy tags */
237 unsigned long *tag_map
; /* bit map of free/busy tags */
238 int busy
; /* current depth */
239 int max_depth
; /* what we will send to device */
240 int real_max_depth
; /* what the array can hold */
241 atomic_t refcnt
; /* map can be shared */
242 int alloc_policy
; /* tag allocation policy */
243 int next_tag
; /* next tag */
245 #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */
246 #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */
248 #define BLK_SCSI_MAX_CMDS (256)
249 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
251 struct queue_limits
{
252 unsigned long bounce_pfn
;
253 unsigned long seg_boundary_mask
;
254 unsigned long virt_boundary_mask
;
256 unsigned int max_hw_sectors
;
257 unsigned int chunk_sectors
;
258 unsigned int max_sectors
;
259 unsigned int max_segment_size
;
260 unsigned int physical_block_size
;
261 unsigned int alignment_offset
;
264 unsigned int max_discard_sectors
;
265 unsigned int max_hw_discard_sectors
;
266 unsigned int max_write_same_sectors
;
267 unsigned int discard_granularity
;
268 unsigned int discard_alignment
;
270 unsigned short logical_block_size
;
271 unsigned short max_segments
;
272 unsigned short max_integrity_segments
;
274 unsigned char misaligned
;
275 unsigned char discard_misaligned
;
276 unsigned char cluster
;
277 unsigned char discard_zeroes_data
;
278 unsigned char raid_partial_stripes_expensive
;
281 struct request_queue
{
283 * Together with queue_head for cacheline sharing
285 struct list_head queue_head
;
286 struct request
*last_merge
;
287 struct elevator_queue
*elevator
;
288 int nr_rqs
[2]; /* # allocated [a]sync rqs */
289 int nr_rqs_elvpriv
; /* # allocated rqs w/ elvpriv */
292 * If blkcg is not used, @q->root_rl serves all requests. If blkcg
293 * is used, root blkg allocates from @q->root_rl and all other
294 * blkgs from their own blkg->rl. Which one to use should be
295 * determined using bio_request_list().
297 struct request_list root_rl
;
299 request_fn_proc
*request_fn
;
300 make_request_fn
*make_request_fn
;
301 prep_rq_fn
*prep_rq_fn
;
302 unprep_rq_fn
*unprep_rq_fn
;
303 softirq_done_fn
*softirq_done_fn
;
304 rq_timed_out_fn
*rq_timed_out_fn
;
305 dma_drain_needed_fn
*dma_drain_needed
;
306 lld_busy_fn
*lld_busy_fn
;
308 struct blk_mq_ops
*mq_ops
;
310 unsigned int *mq_map
;
313 struct blk_mq_ctx __percpu
*queue_ctx
;
314 unsigned int nr_queues
;
316 /* hw dispatch queues */
317 struct blk_mq_hw_ctx
**queue_hw_ctx
;
318 unsigned int nr_hw_queues
;
321 * Dispatch queue sorting
324 struct request
*boundary_rq
;
327 * Delayed queue handling
329 struct delayed_work delay_work
;
331 struct backing_dev_info backing_dev_info
;
334 * The queue owner gets to use this for whatever they like.
335 * ll_rw_blk doesn't touch it.
340 * various queue flags, see QUEUE_* below
342 unsigned long queue_flags
;
345 * ida allocated id for this queue. Used to index queues from
351 * queue needs bounce pages for pages above this limit
356 * protects queue structures from reentrancy. ->__queue_lock should
357 * _never_ be used directly, it is queue private. always use
360 spinlock_t __queue_lock
;
361 spinlock_t
*queue_lock
;
371 struct kobject mq_kobj
;
373 #ifdef CONFIG_BLK_DEV_INTEGRITY
374 struct blk_integrity integrity
;
375 #endif /* CONFIG_BLK_DEV_INTEGRITY */
380 unsigned int nr_pending
;
386 unsigned long nr_requests
; /* Max # of requests */
387 unsigned int nr_congestion_on
;
388 unsigned int nr_congestion_off
;
389 unsigned int nr_batching
;
391 unsigned int dma_drain_size
;
392 void *dma_drain_buffer
;
393 unsigned int dma_pad_mask
;
394 unsigned int dma_alignment
;
396 struct blk_queue_tag
*queue_tags
;
397 struct list_head tag_busy_list
;
399 unsigned int nr_sorted
;
400 unsigned int in_flight
[2];
402 * Number of active block driver functions for which blk_drain_queue()
403 * must wait. Must be incremented around functions that unlock the
404 * queue_lock internally, e.g. scsi_request_fn().
406 unsigned int request_fn_active
;
408 unsigned int rq_timeout
;
409 struct timer_list timeout
;
410 struct list_head timeout_list
;
412 struct list_head icq_list
;
413 #ifdef CONFIG_BLK_CGROUP
414 DECLARE_BITMAP (blkcg_pols
, BLKCG_MAX_POLS
);
415 struct blkcg_gq
*root_blkg
;
416 struct list_head blkg_list
;
419 struct queue_limits limits
;
424 unsigned int sg_timeout
;
425 unsigned int sg_reserved_size
;
427 #ifdef CONFIG_BLK_DEV_IO_TRACE
428 struct blk_trace
*blk_trace
;
431 * for flush operations
433 unsigned int flush_flags
;
434 unsigned int flush_not_queueable
:1;
435 struct blk_flush_queue
*fq
;
437 struct list_head requeue_list
;
438 spinlock_t requeue_lock
;
439 struct work_struct requeue_work
;
441 struct mutex sysfs_lock
;
444 atomic_t mq_freeze_depth
;
446 #if defined(CONFIG_BLK_DEV_BSG)
447 bsg_job_fn
*bsg_job_fn
;
449 struct bsg_class_device bsg_dev
;
452 #ifdef CONFIG_BLK_DEV_THROTTLING
454 struct throtl_data
*td
;
456 struct rcu_head rcu_head
;
457 wait_queue_head_t mq_freeze_wq
;
458 struct percpu_ref q_usage_counter
;
459 struct list_head all_q_node
;
461 struct blk_mq_tag_set
*tag_set
;
462 struct list_head tag_set_list
;
463 struct bio_set
*bio_split
;
465 bool mq_sysfs_init_done
;
468 #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */
469 #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */
470 #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */
471 #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */
472 #define QUEUE_FLAG_DYING 5 /* queue being torn down */
473 #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */
474 #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */
475 #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */
476 #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */
477 #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */
478 #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */
479 #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */
480 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
481 #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */
482 #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */
483 #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */
484 #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */
485 #define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */
486 #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */
487 #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */
488 #define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */
489 #define QUEUE_FLAG_NO_SG_MERGE 21 /* don't attempt to merge SG segments*/
490 #define QUEUE_FLAG_POLL 22 /* IO polling enabled if set */
492 #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
493 (1 << QUEUE_FLAG_STACKABLE) | \
494 (1 << QUEUE_FLAG_SAME_COMP) | \
495 (1 << QUEUE_FLAG_ADD_RANDOM))
497 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
498 (1 << QUEUE_FLAG_STACKABLE) | \
499 (1 << QUEUE_FLAG_SAME_COMP))
501 static inline void queue_lockdep_assert_held(struct request_queue
*q
)
504 lockdep_assert_held(q
->queue_lock
);
507 static inline void queue_flag_set_unlocked(unsigned int flag
,
508 struct request_queue
*q
)
510 __set_bit(flag
, &q
->queue_flags
);
513 static inline int queue_flag_test_and_clear(unsigned int flag
,
514 struct request_queue
*q
)
516 queue_lockdep_assert_held(q
);
518 if (test_bit(flag
, &q
->queue_flags
)) {
519 __clear_bit(flag
, &q
->queue_flags
);
526 static inline int queue_flag_test_and_set(unsigned int flag
,
527 struct request_queue
*q
)
529 queue_lockdep_assert_held(q
);
531 if (!test_bit(flag
, &q
->queue_flags
)) {
532 __set_bit(flag
, &q
->queue_flags
);
539 static inline void queue_flag_set(unsigned int flag
, struct request_queue
*q
)
541 queue_lockdep_assert_held(q
);
542 __set_bit(flag
, &q
->queue_flags
);
545 static inline void queue_flag_clear_unlocked(unsigned int flag
,
546 struct request_queue
*q
)
548 __clear_bit(flag
, &q
->queue_flags
);
551 static inline int queue_in_flight(struct request_queue
*q
)
553 return q
->in_flight
[0] + q
->in_flight
[1];
556 static inline void queue_flag_clear(unsigned int flag
, struct request_queue
*q
)
558 queue_lockdep_assert_held(q
);
559 __clear_bit(flag
, &q
->queue_flags
);
562 #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
563 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
564 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
565 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
566 #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags)
567 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
568 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
569 #define blk_queue_noxmerges(q) \
570 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
571 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
572 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
573 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
574 #define blk_queue_stackable(q) \
575 test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
576 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
577 #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \
578 test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags))
580 #define blk_noretry_request(rq) \
581 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
582 REQ_FAILFAST_DRIVER))
584 #define blk_account_rq(rq) \
585 (((rq)->cmd_flags & REQ_STARTED) && \
586 ((rq)->cmd_type == REQ_TYPE_FS))
588 #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
589 #define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
590 /* rq->queuelist of dequeued request must be list_empty() */
591 #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
593 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
595 #define rq_data_dir(rq) ((int)((rq)->cmd_flags & 1))
598 * Driver can handle struct request, if it either has an old style
599 * request_fn defined, or is blk-mq based.
601 static inline bool queue_is_rq_based(struct request_queue
*q
)
603 return q
->request_fn
|| q
->mq_ops
;
606 static inline unsigned int blk_queue_cluster(struct request_queue
*q
)
608 return q
->limits
.cluster
;
612 * We regard a request as sync, if either a read or a sync write
614 static inline bool rw_is_sync(unsigned int rw_flags
)
616 return !(rw_flags
& REQ_WRITE
) || (rw_flags
& REQ_SYNC
);
619 static inline bool rq_is_sync(struct request
*rq
)
621 return rw_is_sync(rq
->cmd_flags
);
624 static inline bool blk_rl_full(struct request_list
*rl
, bool sync
)
626 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
628 return rl
->flags
& flag
;
631 static inline void blk_set_rl_full(struct request_list
*rl
, bool sync
)
633 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
638 static inline void blk_clear_rl_full(struct request_list
*rl
, bool sync
)
640 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
645 static inline bool rq_mergeable(struct request
*rq
)
647 if (rq
->cmd_type
!= REQ_TYPE_FS
)
650 if (rq
->cmd_flags
& REQ_NOMERGE_FLAGS
)
656 static inline bool blk_check_merge_flags(unsigned int flags1
,
659 if ((flags1
& REQ_DISCARD
) != (flags2
& REQ_DISCARD
))
662 if ((flags1
& REQ_SECURE
) != (flags2
& REQ_SECURE
))
665 if ((flags1
& REQ_WRITE_SAME
) != (flags2
& REQ_WRITE_SAME
))
671 static inline bool blk_write_same_mergeable(struct bio
*a
, struct bio
*b
)
673 if (bio_data(a
) == bio_data(b
))
680 * q->prep_rq_fn return values
682 #define BLKPREP_OK 0 /* serve it */
683 #define BLKPREP_KILL 1 /* fatal error, kill */
684 #define BLKPREP_DEFER 2 /* leave on queue */
686 extern unsigned long blk_max_low_pfn
, blk_max_pfn
;
689 * standard bounce addresses:
691 * BLK_BOUNCE_HIGH : bounce all highmem pages
692 * BLK_BOUNCE_ANY : don't bounce anything
693 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
696 #if BITS_PER_LONG == 32
697 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
699 #define BLK_BOUNCE_HIGH -1ULL
701 #define BLK_BOUNCE_ANY (-1ULL)
702 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
705 * default timeout for SG_IO if none specified
707 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
708 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
711 extern int init_emergency_isa_pool(void);
712 extern void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
);
714 static inline int init_emergency_isa_pool(void)
718 static inline void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
)
721 #endif /* CONFIG_MMU */
727 unsigned long offset
;
732 struct req_iterator
{
733 struct bvec_iter iter
;
737 /* This should not be used directly - use rq_for_each_segment */
738 #define for_each_bio(_bio) \
739 for (; _bio; _bio = _bio->bi_next)
740 #define __rq_for_each_bio(_bio, rq) \
742 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
744 #define rq_for_each_segment(bvl, _rq, _iter) \
745 __rq_for_each_bio(_iter.bio, _rq) \
746 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
748 #define rq_iter_last(bvec, _iter) \
749 (_iter.bio->bi_next == NULL && \
750 bio_iter_last(bvec, _iter.iter))
752 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
753 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
755 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
756 extern void rq_flush_dcache_pages(struct request
*rq
);
758 static inline void rq_flush_dcache_pages(struct request
*rq
)
763 extern int blk_register_queue(struct gendisk
*disk
);
764 extern void blk_unregister_queue(struct gendisk
*disk
);
765 extern blk_qc_t
generic_make_request(struct bio
*bio
);
766 extern void blk_rq_init(struct request_queue
*q
, struct request
*rq
);
767 extern void blk_put_request(struct request
*);
768 extern void __blk_put_request(struct request_queue
*, struct request
*);
769 extern struct request
*blk_get_request(struct request_queue
*, int, gfp_t
);
770 extern struct request
*blk_make_request(struct request_queue
*, struct bio
*,
772 extern void blk_rq_set_block_pc(struct request
*);
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_lld_busy(struct request_queue
*q
);
777 extern int blk_rq_prep_clone(struct request
*rq
, struct request
*rq_src
,
778 struct bio_set
*bs
, gfp_t gfp_mask
,
779 int (*bio_ctr
)(struct bio
*, struct bio
*, void *),
781 extern void blk_rq_unprep_clone(struct request
*rq
);
782 extern int blk_insert_cloned_request(struct request_queue
*q
,
784 extern void blk_delay_queue(struct request_queue
*, unsigned long);
785 extern void blk_queue_split(struct request_queue
*, struct bio
**,
787 extern void blk_recount_segments(struct request_queue
*, struct bio
*);
788 extern int scsi_verify_blk_ioctl(struct block_device
*, unsigned int);
789 extern int scsi_cmd_blk_ioctl(struct block_device
*, fmode_t
,
790 unsigned int, void __user
*);
791 extern int scsi_cmd_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
792 unsigned int, void __user
*);
793 extern int sg_scsi_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
794 struct scsi_ioctl_command __user
*);
796 extern int blk_queue_enter(struct request_queue
*q
, gfp_t gfp
);
797 extern void blk_queue_exit(struct request_queue
*q
);
798 extern void blk_start_queue(struct request_queue
*q
);
799 extern void blk_stop_queue(struct request_queue
*q
);
800 extern void blk_sync_queue(struct request_queue
*q
);
801 extern void __blk_stop_queue(struct request_queue
*q
);
802 extern void __blk_run_queue(struct request_queue
*q
);
803 extern void __blk_run_queue_uncond(struct request_queue
*q
);
804 extern void blk_run_queue(struct request_queue
*);
805 extern void blk_run_queue_async(struct request_queue
*q
);
806 extern int blk_rq_map_user(struct request_queue
*, struct request
*,
807 struct rq_map_data
*, void __user
*, unsigned long,
809 extern int blk_rq_unmap_user(struct bio
*);
810 extern int blk_rq_map_kern(struct request_queue
*, struct request
*, void *, unsigned int, gfp_t
);
811 extern int blk_rq_map_user_iov(struct request_queue
*, struct request
*,
812 struct rq_map_data
*, const struct iov_iter
*,
814 extern int blk_execute_rq(struct request_queue
*, struct gendisk
*,
815 struct request
*, int);
816 extern void blk_execute_rq_nowait(struct request_queue
*, struct gendisk
*,
817 struct request
*, int, rq_end_io_fn
*);
819 bool blk_poll(struct request_queue
*q
, blk_qc_t cookie
);
821 static inline struct request_queue
*bdev_get_queue(struct block_device
*bdev
)
823 return bdev
->bd_disk
->queue
; /* this is never NULL */
827 * blk_rq_pos() : the current sector
828 * blk_rq_bytes() : bytes left in the entire request
829 * blk_rq_cur_bytes() : bytes left in the current segment
830 * blk_rq_err_bytes() : bytes left till the next error boundary
831 * blk_rq_sectors() : sectors left in the entire request
832 * blk_rq_cur_sectors() : sectors left in the current segment
834 static inline sector_t
blk_rq_pos(const struct request
*rq
)
839 static inline unsigned int blk_rq_bytes(const struct request
*rq
)
841 return rq
->__data_len
;
844 static inline int blk_rq_cur_bytes(const struct request
*rq
)
846 return rq
->bio
? bio_cur_bytes(rq
->bio
) : 0;
849 extern unsigned int blk_rq_err_bytes(const struct request
*rq
);
851 static inline unsigned int blk_rq_sectors(const struct request
*rq
)
853 return blk_rq_bytes(rq
) >> 9;
856 static inline unsigned int blk_rq_cur_sectors(const struct request
*rq
)
858 return blk_rq_cur_bytes(rq
) >> 9;
861 static inline unsigned int blk_queue_get_max_sectors(struct request_queue
*q
,
862 unsigned int cmd_flags
)
864 if (unlikely(cmd_flags
& REQ_DISCARD
))
865 return min(q
->limits
.max_discard_sectors
, UINT_MAX
>> 9);
867 if (unlikely(cmd_flags
& REQ_WRITE_SAME
))
868 return q
->limits
.max_write_same_sectors
;
870 return q
->limits
.max_sectors
;
874 * Return maximum size of a request at given offset. Only valid for
875 * file system requests.
877 static inline unsigned int blk_max_size_offset(struct request_queue
*q
,
880 if (!q
->limits
.chunk_sectors
)
881 return q
->limits
.max_sectors
;
883 return q
->limits
.chunk_sectors
-
884 (offset
& (q
->limits
.chunk_sectors
- 1));
887 static inline unsigned int blk_rq_get_max_sectors(struct request
*rq
)
889 struct request_queue
*q
= rq
->q
;
891 if (unlikely(rq
->cmd_type
== REQ_TYPE_BLOCK_PC
))
892 return q
->limits
.max_hw_sectors
;
894 if (!q
->limits
.chunk_sectors
|| (rq
->cmd_flags
& REQ_DISCARD
))
895 return blk_queue_get_max_sectors(q
, rq
->cmd_flags
);
897 return min(blk_max_size_offset(q
, blk_rq_pos(rq
)),
898 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 void blk_finish_request(struct request
*rq
, int error
);
935 extern bool blk_end_request(struct request
*rq
, int error
,
936 unsigned int nr_bytes
);
937 extern void blk_end_request_all(struct request
*rq
, int error
);
938 extern bool blk_end_request_cur(struct request
*rq
, int error
);
939 extern bool blk_end_request_err(struct request
*rq
, int error
);
940 extern bool __blk_end_request(struct request
*rq
, int error
,
941 unsigned int nr_bytes
);
942 extern void __blk_end_request_all(struct request
*rq
, int error
);
943 extern bool __blk_end_request_cur(struct request
*rq
, int error
);
944 extern bool __blk_end_request_err(struct request
*rq
, int error
);
946 extern void blk_complete_request(struct request
*);
947 extern void __blk_complete_request(struct request
*);
948 extern void blk_abort_request(struct request
*);
949 extern void blk_unprep_request(struct request
*);
952 * Access functions for manipulating queue properties
954 extern struct request_queue
*blk_init_queue_node(request_fn_proc
*rfn
,
955 spinlock_t
*lock
, int node_id
);
956 extern struct request_queue
*blk_init_queue(request_fn_proc
*, spinlock_t
*);
957 extern struct request_queue
*blk_init_allocated_queue(struct request_queue
*,
958 request_fn_proc
*, spinlock_t
*);
959 extern void blk_cleanup_queue(struct request_queue
*);
960 extern void blk_queue_make_request(struct request_queue
*, make_request_fn
*);
961 extern void blk_queue_bounce_limit(struct request_queue
*, u64
);
962 extern void blk_limits_max_hw_sectors(struct queue_limits
*, unsigned int);
963 extern void blk_queue_max_hw_sectors(struct request_queue
*, unsigned int);
964 extern void blk_queue_chunk_sectors(struct request_queue
*, unsigned int);
965 extern void blk_queue_max_segments(struct request_queue
*, unsigned short);
966 extern void blk_queue_max_segment_size(struct request_queue
*, unsigned int);
967 extern void blk_queue_max_discard_sectors(struct request_queue
*q
,
968 unsigned int max_discard_sectors
);
969 extern void blk_queue_max_write_same_sectors(struct request_queue
*q
,
970 unsigned int max_write_same_sectors
);
971 extern void blk_queue_logical_block_size(struct request_queue
*, unsigned short);
972 extern void blk_queue_physical_block_size(struct request_queue
*, unsigned int);
973 extern void blk_queue_alignment_offset(struct request_queue
*q
,
974 unsigned int alignment
);
975 extern void blk_limits_io_min(struct queue_limits
*limits
, unsigned int min
);
976 extern void blk_queue_io_min(struct request_queue
*q
, unsigned int min
);
977 extern void blk_limits_io_opt(struct queue_limits
*limits
, unsigned int opt
);
978 extern void blk_queue_io_opt(struct request_queue
*q
, unsigned int opt
);
979 extern void blk_set_default_limits(struct queue_limits
*lim
);
980 extern void blk_set_stacking_limits(struct queue_limits
*lim
);
981 extern int blk_stack_limits(struct queue_limits
*t
, struct queue_limits
*b
,
983 extern int bdev_stack_limits(struct queue_limits
*t
, struct block_device
*bdev
,
985 extern void disk_stack_limits(struct gendisk
*disk
, struct block_device
*bdev
,
987 extern void blk_queue_stack_limits(struct request_queue
*t
, struct request_queue
*b
);
988 extern void blk_queue_dma_pad(struct request_queue
*, unsigned int);
989 extern void blk_queue_update_dma_pad(struct request_queue
*, unsigned int);
990 extern int blk_queue_dma_drain(struct request_queue
*q
,
991 dma_drain_needed_fn
*dma_drain_needed
,
992 void *buf
, unsigned int size
);
993 extern void blk_queue_lld_busy(struct request_queue
*q
, lld_busy_fn
*fn
);
994 extern void blk_queue_segment_boundary(struct request_queue
*, unsigned long);
995 extern void blk_queue_virt_boundary(struct request_queue
*, unsigned long);
996 extern void blk_queue_prep_rq(struct request_queue
*, prep_rq_fn
*pfn
);
997 extern void blk_queue_unprep_rq(struct request_queue
*, unprep_rq_fn
*ufn
);
998 extern void blk_queue_dma_alignment(struct request_queue
*, int);
999 extern void blk_queue_update_dma_alignment(struct request_queue
*, int);
1000 extern void blk_queue_softirq_done(struct request_queue
*, softirq_done_fn
*);
1001 extern void blk_queue_rq_timed_out(struct request_queue
*, rq_timed_out_fn
*);
1002 extern void blk_queue_rq_timeout(struct request_queue
*, unsigned int);
1003 extern void blk_queue_flush(struct request_queue
*q
, unsigned int flush
);
1004 extern void blk_queue_flush_queueable(struct request_queue
*q
, bool queueable
);
1005 extern struct backing_dev_info
*blk_get_backing_dev_info(struct block_device
*bdev
);
1007 extern int blk_rq_map_sg(struct request_queue
*, struct request
*, struct scatterlist
*);
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
*);
1015 extern void blk_set_queue_dying(struct request_queue
*);
1018 * block layer runtime pm functions
1021 extern void blk_pm_runtime_init(struct request_queue
*q
, struct device
*dev
);
1022 extern int blk_pre_runtime_suspend(struct request_queue
*q
);
1023 extern void blk_post_runtime_suspend(struct request_queue
*q
, int err
);
1024 extern void blk_pre_runtime_resume(struct request_queue
*q
);
1025 extern void blk_post_runtime_resume(struct request_queue
*q
, int err
);
1027 static inline void blk_pm_runtime_init(struct request_queue
*q
,
1028 struct device
*dev
) {}
1029 static inline int blk_pre_runtime_suspend(struct request_queue
*q
)
1033 static inline void blk_post_runtime_suspend(struct request_queue
*q
, int err
) {}
1034 static inline void blk_pre_runtime_resume(struct request_queue
*q
) {}
1035 static inline void blk_post_runtime_resume(struct request_queue
*q
, int err
) {}
1039 * blk_plug permits building a queue of related requests by holding the I/O
1040 * fragments for a short period. This allows merging of sequential requests
1041 * into single larger request. As the requests are moved from a per-task list to
1042 * the device's request_queue in a batch, this results in improved scalability
1043 * as the lock contention for request_queue lock is reduced.
1045 * It is ok not to disable preemption when adding the request to the plug list
1046 * or when attempting a merge, because blk_schedule_flush_list() will only flush
1047 * the plug list when the task sleeps by itself. For details, please see
1048 * schedule() where blk_schedule_flush_plug() is called.
1051 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 extern int blk_queue_start_tag(struct request_queue
*, struct request
*);
1100 extern struct request
*blk_queue_find_tag(struct request_queue
*, int);
1101 extern void blk_queue_end_tag(struct request_queue
*, struct request
*);
1102 extern int blk_queue_init_tags(struct request_queue
*, int, struct blk_queue_tag
*, int);
1103 extern void blk_queue_free_tags(struct request_queue
*);
1104 extern int blk_queue_resize_tags(struct request_queue
*, int);
1105 extern void blk_queue_invalidate_tags(struct request_queue
*);
1106 extern struct blk_queue_tag
*blk_init_tags(int, int);
1107 extern void blk_free_tags(struct blk_queue_tag
*);
1109 static inline struct request
*blk_map_queue_find_tag(struct blk_queue_tag
*bqt
,
1112 if (unlikely(bqt
== NULL
|| tag
>= bqt
->real_max_depth
))
1114 return bqt
->tag_index
[tag
];
1117 #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */
1119 extern int blkdev_issue_flush(struct block_device
*, gfp_t
, sector_t
*);
1120 extern int blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1121 sector_t nr_sects
, gfp_t gfp_mask
, unsigned long flags
);
1122 extern int blkdev_issue_write_same(struct block_device
*bdev
, sector_t sector
,
1123 sector_t nr_sects
, gfp_t gfp_mask
, struct page
*page
);
1124 extern int blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1125 sector_t nr_sects
, gfp_t gfp_mask
, bool discard
);
1126 static inline int sb_issue_discard(struct super_block
*sb
, sector_t block
,
1127 sector_t nr_blocks
, gfp_t gfp_mask
, unsigned long flags
)
1129 return blkdev_issue_discard(sb
->s_bdev
, block
<< (sb
->s_blocksize_bits
- 9),
1130 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1133 static inline int sb_issue_zeroout(struct super_block
*sb
, sector_t block
,
1134 sector_t nr_blocks
, gfp_t gfp_mask
)
1136 return blkdev_issue_zeroout(sb
->s_bdev
,
1137 block
<< (sb
->s_blocksize_bits
- 9),
1138 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1142 extern int blk_verify_command(unsigned char *cmd
, fmode_t has_write_perm
);
1144 enum blk_default_limits
{
1145 BLK_MAX_SEGMENTS
= 128,
1146 BLK_SAFE_MAX_SECTORS
= 255,
1147 BLK_DEF_MAX_SECTORS
= 2560,
1148 BLK_MAX_SEGMENT_SIZE
= 65536,
1149 BLK_SEG_BOUNDARY_MASK
= 0xFFFFFFFFUL
,
1152 #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
1154 static inline unsigned long queue_bounce_pfn(struct request_queue
*q
)
1156 return q
->limits
.bounce_pfn
;
1159 static inline unsigned long queue_segment_boundary(struct request_queue
*q
)
1161 return q
->limits
.seg_boundary_mask
;
1164 static inline unsigned long queue_virt_boundary(struct request_queue
*q
)
1166 return q
->limits
.virt_boundary_mask
;
1169 static inline unsigned int queue_max_sectors(struct request_queue
*q
)
1171 return q
->limits
.max_sectors
;
1174 static inline unsigned int queue_max_hw_sectors(struct request_queue
*q
)
1176 return q
->limits
.max_hw_sectors
;
1179 static inline unsigned short queue_max_segments(struct request_queue
*q
)
1181 return q
->limits
.max_segments
;
1184 static inline unsigned int queue_max_segment_size(struct request_queue
*q
)
1186 return q
->limits
.max_segment_size
;
1189 static inline unsigned short queue_logical_block_size(struct request_queue
*q
)
1193 if (q
&& q
->limits
.logical_block_size
)
1194 retval
= q
->limits
.logical_block_size
;
1199 static inline unsigned short bdev_logical_block_size(struct block_device
*bdev
)
1201 return queue_logical_block_size(bdev_get_queue(bdev
));
1204 static inline unsigned int queue_physical_block_size(struct request_queue
*q
)
1206 return q
->limits
.physical_block_size
;
1209 static inline unsigned int bdev_physical_block_size(struct block_device
*bdev
)
1211 return queue_physical_block_size(bdev_get_queue(bdev
));
1214 static inline unsigned int queue_io_min(struct request_queue
*q
)
1216 return q
->limits
.io_min
;
1219 static inline int bdev_io_min(struct block_device
*bdev
)
1221 return queue_io_min(bdev_get_queue(bdev
));
1224 static inline unsigned int queue_io_opt(struct request_queue
*q
)
1226 return q
->limits
.io_opt
;
1229 static inline int bdev_io_opt(struct block_device
*bdev
)
1231 return queue_io_opt(bdev_get_queue(bdev
));
1234 static inline int queue_alignment_offset(struct request_queue
*q
)
1236 if (q
->limits
.misaligned
)
1239 return q
->limits
.alignment_offset
;
1242 static inline int queue_limit_alignment_offset(struct queue_limits
*lim
, sector_t sector
)
1244 unsigned int granularity
= max(lim
->physical_block_size
, lim
->io_min
);
1245 unsigned int alignment
= sector_div(sector
, granularity
>> 9) << 9;
1247 return (granularity
+ lim
->alignment_offset
- alignment
) % granularity
;
1250 static inline int bdev_alignment_offset(struct block_device
*bdev
)
1252 struct request_queue
*q
= bdev_get_queue(bdev
);
1254 if (q
->limits
.misaligned
)
1257 if (bdev
!= bdev
->bd_contains
)
1258 return bdev
->bd_part
->alignment_offset
;
1260 return q
->limits
.alignment_offset
;
1263 static inline int queue_discard_alignment(struct request_queue
*q
)
1265 if (q
->limits
.discard_misaligned
)
1268 return q
->limits
.discard_alignment
;
1271 static inline int queue_limit_discard_alignment(struct queue_limits
*lim
, sector_t sector
)
1273 unsigned int alignment
, granularity
, offset
;
1275 if (!lim
->max_discard_sectors
)
1278 /* Why are these in bytes, not sectors? */
1279 alignment
= lim
->discard_alignment
>> 9;
1280 granularity
= lim
->discard_granularity
>> 9;
1284 /* Offset of the partition start in 'granularity' sectors */
1285 offset
= sector_div(sector
, granularity
);
1287 /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1288 offset
= (granularity
+ alignment
- offset
) % granularity
;
1290 /* Turn it back into bytes, gaah */
1294 static inline int bdev_discard_alignment(struct block_device
*bdev
)
1296 struct request_queue
*q
= bdev_get_queue(bdev
);
1298 if (bdev
!= bdev
->bd_contains
)
1299 return bdev
->bd_part
->discard_alignment
;
1301 return q
->limits
.discard_alignment
;
1304 static inline unsigned int queue_discard_zeroes_data(struct request_queue
*q
)
1306 if (q
->limits
.max_discard_sectors
&& q
->limits
.discard_zeroes_data
== 1)
1312 static inline unsigned int bdev_discard_zeroes_data(struct block_device
*bdev
)
1314 return queue_discard_zeroes_data(bdev_get_queue(bdev
));
1317 static inline unsigned int bdev_write_same(struct block_device
*bdev
)
1319 struct request_queue
*q
= bdev_get_queue(bdev
);
1322 return q
->limits
.max_write_same_sectors
;
1327 static inline int queue_dma_alignment(struct request_queue
*q
)
1329 return q
? q
->dma_alignment
: 511;
1332 static inline int blk_rq_aligned(struct request_queue
*q
, unsigned long addr
,
1335 unsigned int alignment
= queue_dma_alignment(q
) | q
->dma_pad_mask
;
1336 return !(addr
& alignment
) && !(len
& alignment
);
1339 /* assumes size > 256 */
1340 static inline unsigned int blksize_bits(unsigned int size
)
1342 unsigned int bits
= 8;
1346 } while (size
> 256);
1350 static inline unsigned int block_size(struct block_device
*bdev
)
1352 return bdev
->bd_block_size
;
1355 static inline bool queue_flush_queueable(struct request_queue
*q
)
1357 return !q
->flush_not_queueable
;
1360 typedef struct {struct page
*v
;} Sector
;
1362 unsigned char *read_dev_sector(struct block_device
*, sector_t
, Sector
*);
1364 static inline void put_dev_sector(Sector p
)
1366 page_cache_release(p
.v
);
1370 * Check if adding a bio_vec after bprv with offset would create a gap in
1371 * the SG list. Most drivers don't care about this, but some do.
1373 static inline bool bvec_gap_to_prev(struct request_queue
*q
,
1374 struct bio_vec
*bprv
, unsigned int offset
)
1376 if (!queue_virt_boundary(q
))
1379 ((bprv
->bv_offset
+ bprv
->bv_len
) & queue_virt_boundary(q
));
1382 static inline bool bio_will_gap(struct request_queue
*q
, struct bio
*prev
,
1385 if (!bio_has_data(prev
))
1388 return bvec_gap_to_prev(q
, &prev
->bi_io_vec
[prev
->bi_vcnt
- 1],
1389 next
->bi_io_vec
[0].bv_offset
);
1392 static inline bool req_gap_back_merge(struct request
*req
, struct bio
*bio
)
1394 return bio_will_gap(req
->q
, req
->biotail
, bio
);
1397 static inline bool req_gap_front_merge(struct request
*req
, struct bio
*bio
)
1399 return bio_will_gap(req
->q
, bio
, req
->bio
);
1403 int kblockd_schedule_work(struct work_struct
*work
);
1404 int kblockd_schedule_delayed_work(struct delayed_work
*dwork
, unsigned long delay
);
1405 int kblockd_schedule_delayed_work_on(int cpu
, struct delayed_work
*dwork
, unsigned long delay
);
1407 #ifdef CONFIG_BLK_CGROUP
1409 * This should not be using sched_clock(). A real patch is in progress
1410 * to fix this up, until that is in place we need to disable preemption
1411 * around sched_clock() in this function and set_io_start_time_ns().
1413 static inline void set_start_time_ns(struct request
*req
)
1416 req
->start_time_ns
= sched_clock();
1420 static inline void set_io_start_time_ns(struct request
*req
)
1423 req
->io_start_time_ns
= sched_clock();
1427 static inline uint64_t rq_start_time_ns(struct request
*req
)
1429 return req
->start_time_ns
;
1432 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1434 return req
->io_start_time_ns
;
1437 static inline void set_start_time_ns(struct request
*req
) {}
1438 static inline void set_io_start_time_ns(struct request
*req
) {}
1439 static inline uint64_t rq_start_time_ns(struct request
*req
)
1443 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1449 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1450 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1451 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1452 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1454 #if defined(CONFIG_BLK_DEV_INTEGRITY)
1456 enum blk_integrity_flags
{
1457 BLK_INTEGRITY_VERIFY
= 1 << 0,
1458 BLK_INTEGRITY_GENERATE
= 1 << 1,
1459 BLK_INTEGRITY_DEVICE_CAPABLE
= 1 << 2,
1460 BLK_INTEGRITY_IP_CHECKSUM
= 1 << 3,
1463 struct blk_integrity_iter
{
1467 unsigned int data_size
;
1468 unsigned short interval
;
1469 const char *disk_name
;
1472 typedef int (integrity_processing_fn
) (struct blk_integrity_iter
*);
1474 struct blk_integrity_profile
{
1475 integrity_processing_fn
*generate_fn
;
1476 integrity_processing_fn
*verify_fn
;
1480 extern void blk_integrity_register(struct gendisk
*, struct blk_integrity
*);
1481 extern void blk_integrity_unregister(struct gendisk
*);
1482 extern int blk_integrity_compare(struct gendisk
*, struct gendisk
*);
1483 extern int blk_rq_map_integrity_sg(struct request_queue
*, struct bio
*,
1484 struct scatterlist
*);
1485 extern int blk_rq_count_integrity_sg(struct request_queue
*, struct bio
*);
1486 extern bool blk_integrity_merge_rq(struct request_queue
*, struct request
*,
1488 extern bool blk_integrity_merge_bio(struct request_queue
*, struct request
*,
1491 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1493 struct blk_integrity
*bi
= &disk
->queue
->integrity
;
1502 struct blk_integrity
*bdev_get_integrity(struct block_device
*bdev
)
1504 return blk_get_integrity(bdev
->bd_disk
);
1507 static inline bool blk_integrity_rq(struct request
*rq
)
1509 return rq
->cmd_flags
& REQ_INTEGRITY
;
1512 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1515 q
->limits
.max_integrity_segments
= segs
;
1518 static inline unsigned short
1519 queue_max_integrity_segments(struct request_queue
*q
)
1521 return q
->limits
.max_integrity_segments
;
1524 static inline bool integrity_req_gap_back_merge(struct request
*req
,
1527 struct bio_integrity_payload
*bip
= bio_integrity(req
->bio
);
1528 struct bio_integrity_payload
*bip_next
= bio_integrity(next
);
1530 return bvec_gap_to_prev(req
->q
, &bip
->bip_vec
[bip
->bip_vcnt
- 1],
1531 bip_next
->bip_vec
[0].bv_offset
);
1534 static inline bool integrity_req_gap_front_merge(struct request
*req
,
1537 struct bio_integrity_payload
*bip
= bio_integrity(bio
);
1538 struct bio_integrity_payload
*bip_next
= bio_integrity(req
->bio
);
1540 return bvec_gap_to_prev(req
->q
, &bip
->bip_vec
[bip
->bip_vcnt
- 1],
1541 bip_next
->bip_vec
[0].bv_offset
);
1544 #else /* CONFIG_BLK_DEV_INTEGRITY */
1547 struct block_device
;
1549 struct blk_integrity
;
1551 static inline int blk_integrity_rq(struct request
*rq
)
1555 static inline int blk_rq_count_integrity_sg(struct request_queue
*q
,
1560 static inline int blk_rq_map_integrity_sg(struct request_queue
*q
,
1562 struct scatterlist
*s
)
1566 static inline struct blk_integrity
*bdev_get_integrity(struct block_device
*b
)
1570 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1574 static inline int blk_integrity_compare(struct gendisk
*a
, struct gendisk
*b
)
1578 static inline void blk_integrity_register(struct gendisk
*d
,
1579 struct blk_integrity
*b
)
1582 static inline void blk_integrity_unregister(struct gendisk
*d
)
1585 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1589 static inline unsigned short queue_max_integrity_segments(struct request_queue
*q
)
1593 static inline bool blk_integrity_merge_rq(struct request_queue
*rq
,
1599 static inline bool blk_integrity_merge_bio(struct request_queue
*rq
,
1606 static inline bool integrity_req_gap_back_merge(struct request
*req
,
1611 static inline bool integrity_req_gap_front_merge(struct request
*req
,
1617 #endif /* CONFIG_BLK_DEV_INTEGRITY */
1619 struct block_device_operations
{
1620 int (*open
) (struct block_device
*, fmode_t
);
1621 void (*release
) (struct gendisk
*, fmode_t
);
1622 int (*rw_page
)(struct block_device
*, sector_t
, struct page
*, int rw
);
1623 int (*ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1624 int (*compat_ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1625 long (*direct_access
)(struct block_device
*, sector_t
, void __pmem
**,
1626 unsigned long *pfn
);
1627 unsigned int (*check_events
) (struct gendisk
*disk
,
1628 unsigned int clearing
);
1629 /* ->media_changed() is DEPRECATED, use ->check_events() instead */
1630 int (*media_changed
) (struct gendisk
*);
1631 void (*unlock_native_capacity
) (struct gendisk
*);
1632 int (*revalidate_disk
) (struct gendisk
*);
1633 int (*getgeo
)(struct block_device
*, struct hd_geometry
*);
1634 /* this callback is with swap_lock and sometimes page table lock held */
1635 void (*swap_slot_free_notify
) (struct block_device
*, unsigned long);
1636 struct module
*owner
;
1637 const struct pr_ops
*pr_ops
;
1640 extern int __blkdev_driver_ioctl(struct block_device
*, fmode_t
, unsigned int,
1642 extern int bdev_read_page(struct block_device
*, sector_t
, struct page
*);
1643 extern int bdev_write_page(struct block_device
*, sector_t
, struct page
*,
1644 struct writeback_control
*);
1645 extern long bdev_direct_access(struct block_device
*, sector_t
,
1646 void __pmem
**addr
, unsigned long *pfn
, long size
);
1647 #else /* CONFIG_BLOCK */
1649 struct block_device
;
1652 * stubs for when the block layer is configured out
1654 #define buffer_heads_over_limit 0
1656 static inline long nr_blockdev_pages(void)
1664 static inline void blk_start_plug(struct blk_plug
*plug
)
1668 static inline void blk_finish_plug(struct blk_plug
*plug
)
1672 static inline void blk_flush_plug(struct task_struct
*task
)
1676 static inline void blk_schedule_flush_plug(struct task_struct
*task
)
1681 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1686 static inline int blkdev_issue_flush(struct block_device
*bdev
, gfp_t gfp_mask
,
1687 sector_t
*error_sector
)
1692 #endif /* CONFIG_BLOCK */