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/pfn.h>
19 #include <linux/bio.h>
20 #include <linux/stringify.h>
21 #include <linux/gfp.h>
22 #include <linux/bsg.h>
23 #include <linux/smp.h>
24 #include <linux/rcupdate.h>
25 #include <linux/percpu-refcount.h>
26 #include <linux/scatterlist.h>
27 #include <linux/blkzoned.h>
30 struct scsi_ioctl_command
;
33 struct elevator_queue
;
39 struct blk_flush_queue
;
43 #define BLKDEV_MIN_RQ 4
44 #define BLKDEV_MAX_RQ 128 /* Default maximum */
47 * Maximum number of blkcg policies allowed to be registered concurrently.
48 * Defined here to simplify include dependency.
50 #define BLKCG_MAX_POLS 2
52 typedef void (rq_end_io_fn
)(struct request
*, int);
54 #define BLK_RL_SYNCFULL (1U << 0)
55 #define BLK_RL_ASYNCFULL (1U << 1)
58 struct request_queue
*q
; /* the queue this rl belongs to */
59 #ifdef CONFIG_BLK_CGROUP
60 struct blkcg_gq
*blkg
; /* blkg this request pool belongs to */
63 * count[], starved[], and wait[] are indexed by
64 * BLK_RW_SYNC/BLK_RW_ASYNC
69 wait_queue_head_t wait
[2];
75 typedef __u32 __bitwise req_flags_t
;
77 /* elevator knows about this request */
78 #define RQF_SORTED ((__force req_flags_t)(1 << 0))
79 /* drive already may have started this one */
80 #define RQF_STARTED ((__force req_flags_t)(1 << 1))
81 /* uses tagged queueing */
82 #define RQF_QUEUED ((__force req_flags_t)(1 << 2))
83 /* may not be passed by ioscheduler */
84 #define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3))
85 /* request for flush sequence */
86 #define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4))
87 /* merge of different types, fail separately */
88 #define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5))
89 /* track inflight for MQ */
90 #define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6))
91 /* don't call prep for this one */
92 #define RQF_DONTPREP ((__force req_flags_t)(1 << 7))
93 /* set for "ide_preempt" requests and also for requests for which the SCSI
94 "quiesce" state must be ignored. */
95 #define RQF_PREEMPT ((__force req_flags_t)(1 << 8))
96 /* contains copies of user pages */
97 #define RQF_COPY_USER ((__force req_flags_t)(1 << 9))
98 /* vaguely specified driver internal error. Ignored by the block layer */
99 #define RQF_FAILED ((__force req_flags_t)(1 << 10))
100 /* don't warn about errors */
101 #define RQF_QUIET ((__force req_flags_t)(1 << 11))
102 /* elevator private data attached */
103 #define RQF_ELVPRIV ((__force req_flags_t)(1 << 12))
104 /* account I/O stat */
105 #define RQF_IO_STAT ((__force req_flags_t)(1 << 13))
106 /* request came from our alloc pool */
107 #define RQF_ALLOCED ((__force req_flags_t)(1 << 14))
108 /* runtime pm request */
109 #define RQF_PM ((__force req_flags_t)(1 << 15))
110 /* on IO scheduler merge hash */
111 #define RQF_HASHED ((__force req_flags_t)(1 << 16))
112 /* IO stats tracking on */
113 #define RQF_STATS ((__force req_flags_t)(1 << 17))
114 /* Look at ->special_vec for the actual data payload instead of the
116 #define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18))
118 /* flags that prevent us from merging requests: */
119 #define RQF_NOMERGE_FLAGS \
120 (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD)
123 * Try to put the fields that are referenced together in the same cacheline.
125 * If you modify this structure, make sure to update blk_rq_init() and
126 * especially blk_mq_rq_ctx_init() to take care of the added fields.
129 struct list_head queuelist
;
131 struct call_single_data csd
;
135 struct request_queue
*q
;
136 struct blk_mq_ctx
*mq_ctx
;
139 unsigned int cmd_flags
; /* op and common flags */
140 req_flags_t rq_flags
;
144 unsigned long atomic_flags
;
146 /* the following two fields are internal, NEVER access directly */
147 unsigned int __data_len
; /* total data len */
149 sector_t __sector
; /* sector cursor */
155 * The hash is used inside the scheduler, and killed once the
156 * request reaches the dispatch list. The ipi_list is only used
157 * to queue the request for softirq completion, which is long
158 * after the request has been unhashed (and even removed from
159 * the dispatch list).
162 struct hlist_node hash
; /* merge hash */
163 struct list_head ipi_list
;
167 * The rb_node is only used inside the io scheduler, requests
168 * are pruned when moved to the dispatch queue. So let the
169 * completion_data share space with the rb_node.
172 struct rb_node rb_node
; /* sort/lookup */
173 struct bio_vec special_vec
;
174 void *completion_data
;
178 * Three pointers are available for the IO schedulers, if they need
179 * more they have to dynamically allocate it. Flush requests are
180 * never put on the IO scheduler. So let the flush fields share
181 * space with the elevator data.
191 struct list_head list
;
192 rq_end_io_fn
*saved_end_io
;
196 struct gendisk
*rq_disk
;
197 struct hd_struct
*part
;
198 unsigned long start_time
;
199 struct blk_issue_stat issue_stat
;
200 #ifdef CONFIG_BLK_CGROUP
201 struct request_list
*rl
; /* rl this rq is alloced from */
202 unsigned long long start_time_ns
;
203 unsigned long long io_start_time_ns
; /* when passed to hardware */
205 /* Number of scatter-gather DMA addr+len pairs after
206 * physical address coalescing is performed.
208 unsigned short nr_phys_segments
;
209 #if defined(CONFIG_BLK_DEV_INTEGRITY)
210 unsigned short nr_integrity_segments
;
213 unsigned short ioprio
;
215 void *special
; /* opaque pointer available for LLD use */
219 unsigned int extra_len
; /* length of alignment and padding */
221 unsigned long deadline
;
222 struct list_head timeout_list
;
223 unsigned int timeout
;
227 * completion callback.
229 rq_end_io_fn
*end_io
;
233 struct request
*next_rq
;
236 static inline bool blk_rq_is_scsi(struct request
*rq
)
238 return req_op(rq
) == REQ_OP_SCSI_IN
|| req_op(rq
) == REQ_OP_SCSI_OUT
;
241 static inline bool blk_rq_is_private(struct request
*rq
)
243 return req_op(rq
) == REQ_OP_DRV_IN
|| req_op(rq
) == REQ_OP_DRV_OUT
;
246 static inline bool blk_rq_is_passthrough(struct request
*rq
)
248 return blk_rq_is_scsi(rq
) || blk_rq_is_private(rq
);
251 static inline unsigned short req_get_ioprio(struct request
*req
)
256 #include <linux/elevator.h>
258 struct blk_queue_ctx
;
260 typedef void (request_fn_proc
) (struct request_queue
*q
);
261 typedef blk_qc_t (make_request_fn
) (struct request_queue
*q
, struct bio
*bio
);
262 typedef int (prep_rq_fn
) (struct request_queue
*, struct request
*);
263 typedef void (unprep_rq_fn
) (struct request_queue
*, struct request
*);
266 typedef void (softirq_done_fn
)(struct request
*);
267 typedef int (dma_drain_needed_fn
)(struct request
*);
268 typedef int (lld_busy_fn
) (struct request_queue
*q
);
269 typedef int (bsg_job_fn
) (struct bsg_job
*);
270 typedef int (init_rq_fn
)(struct request_queue
*, struct request
*, gfp_t
);
271 typedef void (exit_rq_fn
)(struct request_queue
*, struct request
*);
273 enum blk_eh_timer_return
{
279 typedef enum blk_eh_timer_return (rq_timed_out_fn
)(struct request
*);
281 enum blk_queue_state
{
286 struct blk_queue_tag
{
287 struct request
**tag_index
; /* map of busy tags */
288 unsigned long *tag_map
; /* bit map of free/busy tags */
289 int max_depth
; /* what we will send to device */
290 int real_max_depth
; /* what the array can hold */
291 atomic_t refcnt
; /* map can be shared */
292 int alloc_policy
; /* tag allocation policy */
293 int next_tag
; /* next tag */
295 #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */
296 #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */
298 #define BLK_SCSI_MAX_CMDS (256)
299 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
302 * Zoned block device models (zoned limit).
304 enum blk_zoned_model
{
305 BLK_ZONED_NONE
, /* Regular block device */
306 BLK_ZONED_HA
, /* Host-aware zoned block device */
307 BLK_ZONED_HM
, /* Host-managed zoned block device */
310 struct queue_limits
{
311 unsigned long bounce_pfn
;
312 unsigned long seg_boundary_mask
;
313 unsigned long virt_boundary_mask
;
315 unsigned int max_hw_sectors
;
316 unsigned int max_dev_sectors
;
317 unsigned int chunk_sectors
;
318 unsigned int max_sectors
;
319 unsigned int max_segment_size
;
320 unsigned int physical_block_size
;
321 unsigned int alignment_offset
;
324 unsigned int max_discard_sectors
;
325 unsigned int max_hw_discard_sectors
;
326 unsigned int max_write_same_sectors
;
327 unsigned int max_write_zeroes_sectors
;
328 unsigned int discard_granularity
;
329 unsigned int discard_alignment
;
331 unsigned short logical_block_size
;
332 unsigned short max_segments
;
333 unsigned short max_integrity_segments
;
334 unsigned short max_discard_segments
;
336 unsigned char misaligned
;
337 unsigned char discard_misaligned
;
338 unsigned char cluster
;
339 unsigned char discard_zeroes_data
;
340 unsigned char raid_partial_stripes_expensive
;
341 enum blk_zoned_model zoned
;
344 #ifdef CONFIG_BLK_DEV_ZONED
346 struct blk_zone_report_hdr
{
347 unsigned int nr_zones
;
351 extern int blkdev_report_zones(struct block_device
*bdev
,
352 sector_t sector
, struct blk_zone
*zones
,
353 unsigned int *nr_zones
, gfp_t gfp_mask
);
354 extern int blkdev_reset_zones(struct block_device
*bdev
, sector_t sectors
,
355 sector_t nr_sectors
, gfp_t gfp_mask
);
357 extern int blkdev_report_zones_ioctl(struct block_device
*bdev
, fmode_t mode
,
358 unsigned int cmd
, unsigned long arg
);
359 extern int blkdev_reset_zones_ioctl(struct block_device
*bdev
, fmode_t mode
,
360 unsigned int cmd
, unsigned long arg
);
362 #else /* CONFIG_BLK_DEV_ZONED */
364 static inline int blkdev_report_zones_ioctl(struct block_device
*bdev
,
365 fmode_t mode
, unsigned int cmd
,
371 static inline int blkdev_reset_zones_ioctl(struct block_device
*bdev
,
372 fmode_t mode
, unsigned int cmd
,
378 #endif /* CONFIG_BLK_DEV_ZONED */
380 struct request_queue
{
382 * Together with queue_head for cacheline sharing
384 struct list_head queue_head
;
385 struct request
*last_merge
;
386 struct elevator_queue
*elevator
;
387 int nr_rqs
[2]; /* # allocated [a]sync rqs */
388 int nr_rqs_elvpriv
; /* # allocated rqs w/ elvpriv */
393 * If blkcg is not used, @q->root_rl serves all requests. If blkcg
394 * is used, root blkg allocates from @q->root_rl and all other
395 * blkgs from their own blkg->rl. Which one to use should be
396 * determined using bio_request_list().
398 struct request_list root_rl
;
400 request_fn_proc
*request_fn
;
401 make_request_fn
*make_request_fn
;
402 prep_rq_fn
*prep_rq_fn
;
403 unprep_rq_fn
*unprep_rq_fn
;
404 softirq_done_fn
*softirq_done_fn
;
405 rq_timed_out_fn
*rq_timed_out_fn
;
406 dma_drain_needed_fn
*dma_drain_needed
;
407 lld_busy_fn
*lld_busy_fn
;
408 init_rq_fn
*init_rq_fn
;
409 exit_rq_fn
*exit_rq_fn
;
411 const struct blk_mq_ops
*mq_ops
;
413 unsigned int *mq_map
;
416 struct blk_mq_ctx __percpu
*queue_ctx
;
417 unsigned int nr_queues
;
419 unsigned int queue_depth
;
421 /* hw dispatch queues */
422 struct blk_mq_hw_ctx
**queue_hw_ctx
;
423 unsigned int nr_hw_queues
;
426 * Dispatch queue sorting
429 struct request
*boundary_rq
;
432 * Delayed queue handling
434 struct delayed_work delay_work
;
436 struct backing_dev_info
*backing_dev_info
;
437 struct disk_devt
*disk_devt
;
440 * The queue owner gets to use this for whatever they like.
441 * ll_rw_blk doesn't touch it.
446 * various queue flags, see QUEUE_* below
448 unsigned long queue_flags
;
451 * ida allocated id for this queue. Used to index queues from
457 * queue needs bounce pages for pages above this limit
462 * protects queue structures from reentrancy. ->__queue_lock should
463 * _never_ be used directly, it is queue private. always use
466 spinlock_t __queue_lock
;
467 spinlock_t
*queue_lock
;
477 struct kobject mq_kobj
;
479 #ifdef CONFIG_BLK_DEV_INTEGRITY
480 struct blk_integrity integrity
;
481 #endif /* CONFIG_BLK_DEV_INTEGRITY */
486 unsigned int nr_pending
;
492 unsigned long nr_requests
; /* Max # of requests */
493 unsigned int nr_congestion_on
;
494 unsigned int nr_congestion_off
;
495 unsigned int nr_batching
;
497 unsigned int dma_drain_size
;
498 void *dma_drain_buffer
;
499 unsigned int dma_pad_mask
;
500 unsigned int dma_alignment
;
502 struct blk_queue_tag
*queue_tags
;
503 struct list_head tag_busy_list
;
505 unsigned int nr_sorted
;
506 unsigned int in_flight
[2];
508 struct blk_rq_stat rq_stats
[2];
511 * Number of active block driver functions for which blk_drain_queue()
512 * must wait. Must be incremented around functions that unlock the
513 * queue_lock internally, e.g. scsi_request_fn().
515 unsigned int request_fn_active
;
517 unsigned int rq_timeout
;
519 struct timer_list timeout
;
520 struct work_struct timeout_work
;
521 struct list_head timeout_list
;
523 struct list_head icq_list
;
524 #ifdef CONFIG_BLK_CGROUP
525 DECLARE_BITMAP (blkcg_pols
, BLKCG_MAX_POLS
);
526 struct blkcg_gq
*root_blkg
;
527 struct list_head blkg_list
;
530 struct queue_limits limits
;
535 unsigned int sg_timeout
;
536 unsigned int sg_reserved_size
;
538 #ifdef CONFIG_BLK_DEV_IO_TRACE
539 struct blk_trace
*blk_trace
;
542 * for flush operations
544 struct blk_flush_queue
*fq
;
546 struct list_head requeue_list
;
547 spinlock_t requeue_lock
;
548 struct delayed_work requeue_work
;
550 struct mutex sysfs_lock
;
553 atomic_t mq_freeze_depth
;
555 #if defined(CONFIG_BLK_DEV_BSG)
556 bsg_job_fn
*bsg_job_fn
;
558 struct bsg_class_device bsg_dev
;
561 #ifdef CONFIG_BLK_DEV_THROTTLING
563 struct throtl_data
*td
;
565 struct rcu_head rcu_head
;
566 wait_queue_head_t mq_freeze_wq
;
567 struct percpu_ref q_usage_counter
;
568 struct list_head all_q_node
;
570 struct blk_mq_tag_set
*tag_set
;
571 struct list_head tag_set_list
;
572 struct bio_set
*bio_split
;
574 #ifdef CONFIG_BLK_DEBUG_FS
575 struct dentry
*debugfs_dir
;
576 struct dentry
*mq_debugfs_dir
;
579 bool mq_sysfs_init_done
;
585 #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */
586 #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */
587 #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */
588 #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */
589 #define QUEUE_FLAG_DYING 5 /* queue being torn down */
590 #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */
591 #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */
592 #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */
593 #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */
594 #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */
595 #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */
596 #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */
597 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
598 #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */
599 #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */
600 #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */
601 #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */
602 #define QUEUE_FLAG_SECERASE 17 /* supports secure erase */
603 #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */
604 #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */
605 #define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */
606 #define QUEUE_FLAG_NO_SG_MERGE 21 /* don't attempt to merge SG segments*/
607 #define QUEUE_FLAG_POLL 22 /* IO polling enabled if set */
608 #define QUEUE_FLAG_WC 23 /* Write back caching */
609 #define QUEUE_FLAG_FUA 24 /* device supports FUA writes */
610 #define QUEUE_FLAG_FLUSH_NQ 25 /* flush not queueuable */
611 #define QUEUE_FLAG_DAX 26 /* device supports DAX */
612 #define QUEUE_FLAG_STATS 27 /* track rq completion times */
613 #define QUEUE_FLAG_RESTART 28 /* queue needs restart at completion */
615 #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
616 (1 << QUEUE_FLAG_STACKABLE) | \
617 (1 << QUEUE_FLAG_SAME_COMP) | \
618 (1 << QUEUE_FLAG_ADD_RANDOM))
620 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
621 (1 << QUEUE_FLAG_STACKABLE) | \
622 (1 << QUEUE_FLAG_SAME_COMP) | \
623 (1 << QUEUE_FLAG_POLL))
625 static inline void queue_lockdep_assert_held(struct request_queue
*q
)
628 lockdep_assert_held(q
->queue_lock
);
631 static inline void queue_flag_set_unlocked(unsigned int flag
,
632 struct request_queue
*q
)
634 __set_bit(flag
, &q
->queue_flags
);
637 static inline int queue_flag_test_and_clear(unsigned int flag
,
638 struct request_queue
*q
)
640 queue_lockdep_assert_held(q
);
642 if (test_bit(flag
, &q
->queue_flags
)) {
643 __clear_bit(flag
, &q
->queue_flags
);
650 static inline int queue_flag_test_and_set(unsigned int flag
,
651 struct request_queue
*q
)
653 queue_lockdep_assert_held(q
);
655 if (!test_bit(flag
, &q
->queue_flags
)) {
656 __set_bit(flag
, &q
->queue_flags
);
663 static inline void queue_flag_set(unsigned int flag
, struct request_queue
*q
)
665 queue_lockdep_assert_held(q
);
666 __set_bit(flag
, &q
->queue_flags
);
669 static inline void queue_flag_clear_unlocked(unsigned int flag
,
670 struct request_queue
*q
)
672 __clear_bit(flag
, &q
->queue_flags
);
675 static inline int queue_in_flight(struct request_queue
*q
)
677 return q
->in_flight
[0] + q
->in_flight
[1];
680 static inline void queue_flag_clear(unsigned int flag
, struct request_queue
*q
)
682 queue_lockdep_assert_held(q
);
683 __clear_bit(flag
, &q
->queue_flags
);
686 #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
687 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
688 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
689 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
690 #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags)
691 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
692 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
693 #define blk_queue_noxmerges(q) \
694 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
695 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
696 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
697 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
698 #define blk_queue_stackable(q) \
699 test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
700 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
701 #define blk_queue_secure_erase(q) \
702 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
703 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
705 #define blk_noretry_request(rq) \
706 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
707 REQ_FAILFAST_DRIVER))
709 static inline bool blk_account_rq(struct request
*rq
)
711 return (rq
->rq_flags
& RQF_STARTED
) && !blk_rq_is_passthrough(rq
);
714 #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
715 #define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
716 /* rq->queuelist of dequeued request must be list_empty() */
717 #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
719 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
721 #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ)
724 * Driver can handle struct request, if it either has an old style
725 * request_fn defined, or is blk-mq based.
727 static inline bool queue_is_rq_based(struct request_queue
*q
)
729 return q
->request_fn
|| q
->mq_ops
;
732 static inline unsigned int blk_queue_cluster(struct request_queue
*q
)
734 return q
->limits
.cluster
;
737 static inline enum blk_zoned_model
738 blk_queue_zoned_model(struct request_queue
*q
)
740 return q
->limits
.zoned
;
743 static inline bool blk_queue_is_zoned(struct request_queue
*q
)
745 switch (blk_queue_zoned_model(q
)) {
754 static inline unsigned int blk_queue_zone_sectors(struct request_queue
*q
)
756 return blk_queue_is_zoned(q
) ? q
->limits
.chunk_sectors
: 0;
759 static inline bool rq_is_sync(struct request
*rq
)
761 return op_is_sync(rq
->cmd_flags
);
764 static inline bool blk_rl_full(struct request_list
*rl
, bool sync
)
766 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
768 return rl
->flags
& flag
;
771 static inline void blk_set_rl_full(struct request_list
*rl
, bool sync
)
773 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
778 static inline void blk_clear_rl_full(struct request_list
*rl
, bool sync
)
780 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
785 static inline bool rq_mergeable(struct request
*rq
)
787 if (blk_rq_is_passthrough(rq
))
790 if (req_op(rq
) == REQ_OP_FLUSH
)
793 if (req_op(rq
) == REQ_OP_WRITE_ZEROES
)
796 if (rq
->cmd_flags
& REQ_NOMERGE_FLAGS
)
798 if (rq
->rq_flags
& RQF_NOMERGE_FLAGS
)
804 static inline bool blk_write_same_mergeable(struct bio
*a
, struct bio
*b
)
806 if (bio_data(a
) == bio_data(b
))
812 static inline unsigned int blk_queue_depth(struct request_queue
*q
)
815 return q
->queue_depth
;
817 return q
->nr_requests
;
821 * q->prep_rq_fn return values
824 BLKPREP_OK
, /* serve it */
825 BLKPREP_KILL
, /* fatal error, kill, return -EIO */
826 BLKPREP_DEFER
, /* leave on queue */
827 BLKPREP_INVALID
, /* invalid command, kill, return -EREMOTEIO */
830 extern unsigned long blk_max_low_pfn
, blk_max_pfn
;
833 * standard bounce addresses:
835 * BLK_BOUNCE_HIGH : bounce all highmem pages
836 * BLK_BOUNCE_ANY : don't bounce anything
837 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
840 #if BITS_PER_LONG == 32
841 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
843 #define BLK_BOUNCE_HIGH -1ULL
845 #define BLK_BOUNCE_ANY (-1ULL)
846 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
849 * default timeout for SG_IO if none specified
851 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
852 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
855 extern int init_emergency_isa_pool(void);
856 extern void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
);
858 static inline int init_emergency_isa_pool(void)
862 static inline void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
)
865 #endif /* CONFIG_MMU */
871 unsigned long offset
;
876 struct req_iterator
{
877 struct bvec_iter iter
;
881 /* This should not be used directly - use rq_for_each_segment */
882 #define for_each_bio(_bio) \
883 for (; _bio; _bio = _bio->bi_next)
884 #define __rq_for_each_bio(_bio, rq) \
886 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
888 #define rq_for_each_segment(bvl, _rq, _iter) \
889 __rq_for_each_bio(_iter.bio, _rq) \
890 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
892 #define rq_iter_last(bvec, _iter) \
893 (_iter.bio->bi_next == NULL && \
894 bio_iter_last(bvec, _iter.iter))
896 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
897 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
899 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
900 extern void rq_flush_dcache_pages(struct request
*rq
);
902 static inline void rq_flush_dcache_pages(struct request
*rq
)
908 #define vfs_msg(sb, level, fmt, ...) \
909 __vfs_msg(sb, level, fmt, ##__VA_ARGS__)
911 #define vfs_msg(sb, level, fmt, ...) \
913 no_printk(fmt, ##__VA_ARGS__); \
914 __vfs_msg(sb, "", " "); \
918 extern int blk_register_queue(struct gendisk
*disk
);
919 extern void blk_unregister_queue(struct gendisk
*disk
);
920 extern blk_qc_t
generic_make_request(struct bio
*bio
);
921 extern void blk_rq_init(struct request_queue
*q
, struct request
*rq
);
922 extern void blk_put_request(struct request
*);
923 extern void __blk_put_request(struct request_queue
*, struct request
*);
924 extern struct request
*blk_get_request(struct request_queue
*, int, gfp_t
);
925 extern void blk_requeue_request(struct request_queue
*, struct request
*);
926 extern int blk_lld_busy(struct request_queue
*q
);
927 extern int blk_rq_prep_clone(struct request
*rq
, struct request
*rq_src
,
928 struct bio_set
*bs
, gfp_t gfp_mask
,
929 int (*bio_ctr
)(struct bio
*, struct bio
*, void *),
931 extern void blk_rq_unprep_clone(struct request
*rq
);
932 extern int blk_insert_cloned_request(struct request_queue
*q
,
934 extern int blk_rq_append_bio(struct request
*rq
, struct bio
*bio
);
935 extern void blk_delay_queue(struct request_queue
*, unsigned long);
936 extern void blk_queue_split(struct request_queue
*, struct bio
**,
938 extern void blk_recount_segments(struct request_queue
*, struct bio
*);
939 extern int scsi_verify_blk_ioctl(struct block_device
*, unsigned int);
940 extern int scsi_cmd_blk_ioctl(struct block_device
*, fmode_t
,
941 unsigned int, void __user
*);
942 extern int scsi_cmd_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
943 unsigned int, void __user
*);
944 extern int sg_scsi_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
945 struct scsi_ioctl_command __user
*);
947 extern int blk_queue_enter(struct request_queue
*q
, bool nowait
);
948 extern void blk_queue_exit(struct request_queue
*q
);
949 extern void blk_start_queue(struct request_queue
*q
);
950 extern void blk_start_queue_async(struct request_queue
*q
);
951 extern void blk_stop_queue(struct request_queue
*q
);
952 extern void blk_sync_queue(struct request_queue
*q
);
953 extern void __blk_stop_queue(struct request_queue
*q
);
954 extern void __blk_run_queue(struct request_queue
*q
);
955 extern void __blk_run_queue_uncond(struct request_queue
*q
);
956 extern void blk_run_queue(struct request_queue
*);
957 extern void blk_run_queue_async(struct request_queue
*q
);
958 extern void blk_mq_quiesce_queue(struct request_queue
*q
);
959 extern int blk_rq_map_user(struct request_queue
*, struct request
*,
960 struct rq_map_data
*, void __user
*, unsigned long,
962 extern int blk_rq_unmap_user(struct bio
*);
963 extern int blk_rq_map_kern(struct request_queue
*, struct request
*, void *, unsigned int, gfp_t
);
964 extern int blk_rq_map_user_iov(struct request_queue
*, struct request
*,
965 struct rq_map_data
*, const struct iov_iter
*,
967 extern int blk_execute_rq(struct request_queue
*, struct gendisk
*,
968 struct request
*, int);
969 extern void blk_execute_rq_nowait(struct request_queue
*, struct gendisk
*,
970 struct request
*, int, rq_end_io_fn
*);
972 bool blk_mq_poll(struct request_queue
*q
, blk_qc_t cookie
);
974 static inline struct request_queue
*bdev_get_queue(struct block_device
*bdev
)
976 return bdev
->bd_disk
->queue
; /* this is never NULL */
980 * blk_rq_pos() : the current sector
981 * blk_rq_bytes() : bytes left in the entire request
982 * blk_rq_cur_bytes() : bytes left in the current segment
983 * blk_rq_err_bytes() : bytes left till the next error boundary
984 * blk_rq_sectors() : sectors left in the entire request
985 * blk_rq_cur_sectors() : sectors left in the current segment
987 static inline sector_t
blk_rq_pos(const struct request
*rq
)
992 static inline unsigned int blk_rq_bytes(const struct request
*rq
)
994 return rq
->__data_len
;
997 static inline int blk_rq_cur_bytes(const struct request
*rq
)
999 return rq
->bio
? bio_cur_bytes(rq
->bio
) : 0;
1002 extern unsigned int blk_rq_err_bytes(const struct request
*rq
);
1004 static inline unsigned int blk_rq_sectors(const struct request
*rq
)
1006 return blk_rq_bytes(rq
) >> 9;
1009 static inline unsigned int blk_rq_cur_sectors(const struct request
*rq
)
1011 return blk_rq_cur_bytes(rq
) >> 9;
1015 * Some commands like WRITE SAME have a payload or data transfer size which
1016 * is different from the size of the request. Any driver that supports such
1017 * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to
1018 * calculate the data transfer size.
1020 static inline unsigned int blk_rq_payload_bytes(struct request
*rq
)
1022 if (rq
->rq_flags
& RQF_SPECIAL_PAYLOAD
)
1023 return rq
->special_vec
.bv_len
;
1024 return blk_rq_bytes(rq
);
1027 static inline unsigned int blk_queue_get_max_sectors(struct request_queue
*q
,
1030 if (unlikely(op
== REQ_OP_DISCARD
|| op
== REQ_OP_SECURE_ERASE
))
1031 return min(q
->limits
.max_discard_sectors
, UINT_MAX
>> 9);
1033 if (unlikely(op
== REQ_OP_WRITE_SAME
))
1034 return q
->limits
.max_write_same_sectors
;
1036 if (unlikely(op
== REQ_OP_WRITE_ZEROES
))
1037 return q
->limits
.max_write_zeroes_sectors
;
1039 return q
->limits
.max_sectors
;
1043 * Return maximum size of a request at given offset. Only valid for
1044 * file system requests.
1046 static inline unsigned int blk_max_size_offset(struct request_queue
*q
,
1049 if (!q
->limits
.chunk_sectors
)
1050 return q
->limits
.max_sectors
;
1052 return q
->limits
.chunk_sectors
-
1053 (offset
& (q
->limits
.chunk_sectors
- 1));
1056 static inline unsigned int blk_rq_get_max_sectors(struct request
*rq
,
1059 struct request_queue
*q
= rq
->q
;
1061 if (blk_rq_is_passthrough(rq
))
1062 return q
->limits
.max_hw_sectors
;
1064 if (!q
->limits
.chunk_sectors
||
1065 req_op(rq
) == REQ_OP_DISCARD
||
1066 req_op(rq
) == REQ_OP_SECURE_ERASE
)
1067 return blk_queue_get_max_sectors(q
, req_op(rq
));
1069 return min(blk_max_size_offset(q
, offset
),
1070 blk_queue_get_max_sectors(q
, req_op(rq
)));
1073 static inline unsigned int blk_rq_count_bios(struct request
*rq
)
1075 unsigned int nr_bios
= 0;
1078 __rq_for_each_bio(bio
, rq
)
1085 * blk_rq_set_prio - associate a request with prio from ioc
1086 * @rq: request of interest
1087 * @ioc: target iocontext
1089 * Assocate request prio with ioc prio so request based drivers
1090 * can leverage priority information.
1092 static inline void blk_rq_set_prio(struct request
*rq
, struct io_context
*ioc
)
1095 rq
->ioprio
= ioc
->ioprio
;
1099 * Request issue related functions.
1101 extern struct request
*blk_peek_request(struct request_queue
*q
);
1102 extern void blk_start_request(struct request
*rq
);
1103 extern struct request
*blk_fetch_request(struct request_queue
*q
);
1106 * Request completion related functions.
1108 * blk_update_request() completes given number of bytes and updates
1109 * the request without completing it.
1111 * blk_end_request() and friends. __blk_end_request() must be called
1112 * with the request queue spinlock acquired.
1114 * Several drivers define their own end_request and call
1115 * blk_end_request() for parts of the original function.
1116 * This prevents code duplication in drivers.
1118 extern bool blk_update_request(struct request
*rq
, int error
,
1119 unsigned int nr_bytes
);
1120 extern void blk_finish_request(struct request
*rq
, int error
);
1121 extern bool blk_end_request(struct request
*rq
, int error
,
1122 unsigned int nr_bytes
);
1123 extern void blk_end_request_all(struct request
*rq
, int error
);
1124 extern bool blk_end_request_cur(struct request
*rq
, int error
);
1125 extern bool blk_end_request_err(struct request
*rq
, int error
);
1126 extern bool __blk_end_request(struct request
*rq
, int error
,
1127 unsigned int nr_bytes
);
1128 extern void __blk_end_request_all(struct request
*rq
, int error
);
1129 extern bool __blk_end_request_cur(struct request
*rq
, int error
);
1130 extern bool __blk_end_request_err(struct request
*rq
, int error
);
1132 extern void blk_complete_request(struct request
*);
1133 extern void __blk_complete_request(struct request
*);
1134 extern void blk_abort_request(struct request
*);
1135 extern void blk_unprep_request(struct request
*);
1138 * Access functions for manipulating queue properties
1140 extern struct request_queue
*blk_init_queue_node(request_fn_proc
*rfn
,
1141 spinlock_t
*lock
, int node_id
);
1142 extern struct request_queue
*blk_init_queue(request_fn_proc
*, spinlock_t
*);
1143 extern int blk_init_allocated_queue(struct request_queue
*);
1144 extern void blk_cleanup_queue(struct request_queue
*);
1145 extern void blk_queue_make_request(struct request_queue
*, make_request_fn
*);
1146 extern void blk_queue_bounce_limit(struct request_queue
*, u64
);
1147 extern void blk_queue_max_hw_sectors(struct request_queue
*, unsigned int);
1148 extern void blk_queue_chunk_sectors(struct request_queue
*, unsigned int);
1149 extern void blk_queue_max_segments(struct request_queue
*, unsigned short);
1150 extern void blk_queue_max_discard_segments(struct request_queue
*,
1152 extern void blk_queue_max_segment_size(struct request_queue
*, unsigned int);
1153 extern void blk_queue_max_discard_sectors(struct request_queue
*q
,
1154 unsigned int max_discard_sectors
);
1155 extern void blk_queue_max_write_same_sectors(struct request_queue
*q
,
1156 unsigned int max_write_same_sectors
);
1157 extern void blk_queue_max_write_zeroes_sectors(struct request_queue
*q
,
1158 unsigned int max_write_same_sectors
);
1159 extern void blk_queue_logical_block_size(struct request_queue
*, unsigned short);
1160 extern void blk_queue_physical_block_size(struct request_queue
*, unsigned int);
1161 extern void blk_queue_alignment_offset(struct request_queue
*q
,
1162 unsigned int alignment
);
1163 extern void blk_limits_io_min(struct queue_limits
*limits
, unsigned int min
);
1164 extern void blk_queue_io_min(struct request_queue
*q
, unsigned int min
);
1165 extern void blk_limits_io_opt(struct queue_limits
*limits
, unsigned int opt
);
1166 extern void blk_queue_io_opt(struct request_queue
*q
, unsigned int opt
);
1167 extern void blk_set_queue_depth(struct request_queue
*q
, unsigned int depth
);
1168 extern void blk_set_default_limits(struct queue_limits
*lim
);
1169 extern void blk_set_stacking_limits(struct queue_limits
*lim
);
1170 extern int blk_stack_limits(struct queue_limits
*t
, struct queue_limits
*b
,
1172 extern int bdev_stack_limits(struct queue_limits
*t
, struct block_device
*bdev
,
1174 extern void disk_stack_limits(struct gendisk
*disk
, struct block_device
*bdev
,
1176 extern void blk_queue_stack_limits(struct request_queue
*t
, struct request_queue
*b
);
1177 extern void blk_queue_dma_pad(struct request_queue
*, unsigned int);
1178 extern void blk_queue_update_dma_pad(struct request_queue
*, unsigned int);
1179 extern int blk_queue_dma_drain(struct request_queue
*q
,
1180 dma_drain_needed_fn
*dma_drain_needed
,
1181 void *buf
, unsigned int size
);
1182 extern void blk_queue_lld_busy(struct request_queue
*q
, lld_busy_fn
*fn
);
1183 extern void blk_queue_segment_boundary(struct request_queue
*, unsigned long);
1184 extern void blk_queue_virt_boundary(struct request_queue
*, unsigned long);
1185 extern void blk_queue_prep_rq(struct request_queue
*, prep_rq_fn
*pfn
);
1186 extern void blk_queue_unprep_rq(struct request_queue
*, unprep_rq_fn
*ufn
);
1187 extern void blk_queue_dma_alignment(struct request_queue
*, int);
1188 extern void blk_queue_update_dma_alignment(struct request_queue
*, int);
1189 extern void blk_queue_softirq_done(struct request_queue
*, softirq_done_fn
*);
1190 extern void blk_queue_rq_timed_out(struct request_queue
*, rq_timed_out_fn
*);
1191 extern void blk_queue_rq_timeout(struct request_queue
*, unsigned int);
1192 extern void blk_queue_flush_queueable(struct request_queue
*q
, bool queueable
);
1193 extern void blk_queue_write_cache(struct request_queue
*q
, bool enabled
, bool fua
);
1196 * Number of physical segments as sent to the device.
1198 * Normally this is the number of discontiguous data segments sent by the
1199 * submitter. But for data-less command like discard we might have no
1200 * actual data segments submitted, but the driver might have to add it's
1201 * own special payload. In that case we still return 1 here so that this
1202 * special payload will be mapped.
1204 static inline unsigned short blk_rq_nr_phys_segments(struct request
*rq
)
1206 if (rq
->rq_flags
& RQF_SPECIAL_PAYLOAD
)
1208 return rq
->nr_phys_segments
;
1212 * Number of discard segments (or ranges) the driver needs to fill in.
1213 * Each discard bio merged into a request is counted as one segment.
1215 static inline unsigned short blk_rq_nr_discard_segments(struct request
*rq
)
1217 return max_t(unsigned short, rq
->nr_phys_segments
, 1);
1220 extern int blk_rq_map_sg(struct request_queue
*, struct request
*, struct scatterlist
*);
1221 extern void blk_dump_rq_flags(struct request
*, char *);
1222 extern long nr_blockdev_pages(void);
1224 bool __must_check
blk_get_queue(struct request_queue
*);
1225 struct request_queue
*blk_alloc_queue(gfp_t
);
1226 struct request_queue
*blk_alloc_queue_node(gfp_t
, int);
1227 extern void blk_put_queue(struct request_queue
*);
1228 extern void blk_set_queue_dying(struct request_queue
*);
1231 * block layer runtime pm functions
1234 extern void blk_pm_runtime_init(struct request_queue
*q
, struct device
*dev
);
1235 extern int blk_pre_runtime_suspend(struct request_queue
*q
);
1236 extern void blk_post_runtime_suspend(struct request_queue
*q
, int err
);
1237 extern void blk_pre_runtime_resume(struct request_queue
*q
);
1238 extern void blk_post_runtime_resume(struct request_queue
*q
, int err
);
1239 extern void blk_set_runtime_active(struct request_queue
*q
);
1241 static inline void blk_pm_runtime_init(struct request_queue
*q
,
1242 struct device
*dev
) {}
1243 static inline int blk_pre_runtime_suspend(struct request_queue
*q
)
1247 static inline void blk_post_runtime_suspend(struct request_queue
*q
, int err
) {}
1248 static inline void blk_pre_runtime_resume(struct request_queue
*q
) {}
1249 static inline void blk_post_runtime_resume(struct request_queue
*q
, int err
) {}
1250 static inline void blk_set_runtime_active(struct request_queue
*q
) {}
1254 * blk_plug permits building a queue of related requests by holding the I/O
1255 * fragments for a short period. This allows merging of sequential requests
1256 * into single larger request. As the requests are moved from a per-task list to
1257 * the device's request_queue in a batch, this results in improved scalability
1258 * as the lock contention for request_queue lock is reduced.
1260 * It is ok not to disable preemption when adding the request to the plug list
1261 * or when attempting a merge, because blk_schedule_flush_list() will only flush
1262 * the plug list when the task sleeps by itself. For details, please see
1263 * schedule() where blk_schedule_flush_plug() is called.
1266 struct list_head list
; /* requests */
1267 struct list_head mq_list
; /* blk-mq requests */
1268 struct list_head cb_list
; /* md requires an unplug callback */
1270 #define BLK_MAX_REQUEST_COUNT 16
1271 #define BLK_PLUG_FLUSH_SIZE (128 * 1024)
1274 typedef void (*blk_plug_cb_fn
)(struct blk_plug_cb
*, bool);
1275 struct blk_plug_cb
{
1276 struct list_head list
;
1277 blk_plug_cb_fn callback
;
1280 extern struct blk_plug_cb
*blk_check_plugged(blk_plug_cb_fn unplug
,
1281 void *data
, int size
);
1282 extern void blk_start_plug(struct blk_plug
*);
1283 extern void blk_finish_plug(struct blk_plug
*);
1284 extern void blk_flush_plug_list(struct blk_plug
*, bool);
1286 static inline void blk_flush_plug(struct task_struct
*tsk
)
1288 struct blk_plug
*plug
= tsk
->plug
;
1291 blk_flush_plug_list(plug
, false);
1294 static inline void blk_schedule_flush_plug(struct task_struct
*tsk
)
1296 struct blk_plug
*plug
= tsk
->plug
;
1299 blk_flush_plug_list(plug
, true);
1302 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1304 struct blk_plug
*plug
= tsk
->plug
;
1307 (!list_empty(&plug
->list
) ||
1308 !list_empty(&plug
->mq_list
) ||
1309 !list_empty(&plug
->cb_list
));
1315 extern int blk_queue_start_tag(struct request_queue
*, struct request
*);
1316 extern struct request
*blk_queue_find_tag(struct request_queue
*, int);
1317 extern void blk_queue_end_tag(struct request_queue
*, struct request
*);
1318 extern int blk_queue_init_tags(struct request_queue
*, int, struct blk_queue_tag
*, int);
1319 extern void blk_queue_free_tags(struct request_queue
*);
1320 extern int blk_queue_resize_tags(struct request_queue
*, int);
1321 extern void blk_queue_invalidate_tags(struct request_queue
*);
1322 extern struct blk_queue_tag
*blk_init_tags(int, int);
1323 extern void blk_free_tags(struct blk_queue_tag
*);
1325 static inline struct request
*blk_map_queue_find_tag(struct blk_queue_tag
*bqt
,
1328 if (unlikely(bqt
== NULL
|| tag
>= bqt
->real_max_depth
))
1330 return bqt
->tag_index
[tag
];
1334 #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */
1335 #define BLKDEV_DISCARD_ZERO (1 << 1) /* must reliably zero data */
1337 extern int blkdev_issue_flush(struct block_device
*, gfp_t
, sector_t
*);
1338 extern int blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1339 sector_t nr_sects
, gfp_t gfp_mask
, unsigned long flags
);
1340 extern int __blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1341 sector_t nr_sects
, gfp_t gfp_mask
, int flags
,
1343 extern int blkdev_issue_write_same(struct block_device
*bdev
, sector_t sector
,
1344 sector_t nr_sects
, gfp_t gfp_mask
, struct page
*page
);
1345 extern int __blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1346 sector_t nr_sects
, gfp_t gfp_mask
, struct bio
**biop
,
1348 extern int blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1349 sector_t nr_sects
, gfp_t gfp_mask
, bool discard
);
1350 static inline int sb_issue_discard(struct super_block
*sb
, sector_t block
,
1351 sector_t nr_blocks
, gfp_t gfp_mask
, unsigned long flags
)
1353 return blkdev_issue_discard(sb
->s_bdev
, block
<< (sb
->s_blocksize_bits
- 9),
1354 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1357 static inline int sb_issue_zeroout(struct super_block
*sb
, sector_t block
,
1358 sector_t nr_blocks
, gfp_t gfp_mask
)
1360 return blkdev_issue_zeroout(sb
->s_bdev
,
1361 block
<< (sb
->s_blocksize_bits
- 9),
1362 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1366 extern int blk_verify_command(unsigned char *cmd
, fmode_t has_write_perm
);
1368 enum blk_default_limits
{
1369 BLK_MAX_SEGMENTS
= 128,
1370 BLK_SAFE_MAX_SECTORS
= 255,
1371 BLK_DEF_MAX_SECTORS
= 2560,
1372 BLK_MAX_SEGMENT_SIZE
= 65536,
1373 BLK_SEG_BOUNDARY_MASK
= 0xFFFFFFFFUL
,
1376 #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
1378 static inline unsigned long queue_bounce_pfn(struct request_queue
*q
)
1380 return q
->limits
.bounce_pfn
;
1383 static inline unsigned long queue_segment_boundary(struct request_queue
*q
)
1385 return q
->limits
.seg_boundary_mask
;
1388 static inline unsigned long queue_virt_boundary(struct request_queue
*q
)
1390 return q
->limits
.virt_boundary_mask
;
1393 static inline unsigned int queue_max_sectors(struct request_queue
*q
)
1395 return q
->limits
.max_sectors
;
1398 static inline unsigned int queue_max_hw_sectors(struct request_queue
*q
)
1400 return q
->limits
.max_hw_sectors
;
1403 static inline unsigned short queue_max_segments(struct request_queue
*q
)
1405 return q
->limits
.max_segments
;
1408 static inline unsigned short queue_max_discard_segments(struct request_queue
*q
)
1410 return q
->limits
.max_discard_segments
;
1413 static inline unsigned int queue_max_segment_size(struct request_queue
*q
)
1415 return q
->limits
.max_segment_size
;
1418 static inline unsigned short queue_logical_block_size(struct request_queue
*q
)
1422 if (q
&& q
->limits
.logical_block_size
)
1423 retval
= q
->limits
.logical_block_size
;
1428 static inline unsigned short bdev_logical_block_size(struct block_device
*bdev
)
1430 return queue_logical_block_size(bdev_get_queue(bdev
));
1433 static inline unsigned int queue_physical_block_size(struct request_queue
*q
)
1435 return q
->limits
.physical_block_size
;
1438 static inline unsigned int bdev_physical_block_size(struct block_device
*bdev
)
1440 return queue_physical_block_size(bdev_get_queue(bdev
));
1443 static inline unsigned int queue_io_min(struct request_queue
*q
)
1445 return q
->limits
.io_min
;
1448 static inline int bdev_io_min(struct block_device
*bdev
)
1450 return queue_io_min(bdev_get_queue(bdev
));
1453 static inline unsigned int queue_io_opt(struct request_queue
*q
)
1455 return q
->limits
.io_opt
;
1458 static inline int bdev_io_opt(struct block_device
*bdev
)
1460 return queue_io_opt(bdev_get_queue(bdev
));
1463 static inline int queue_alignment_offset(struct request_queue
*q
)
1465 if (q
->limits
.misaligned
)
1468 return q
->limits
.alignment_offset
;
1471 static inline int queue_limit_alignment_offset(struct queue_limits
*lim
, sector_t sector
)
1473 unsigned int granularity
= max(lim
->physical_block_size
, lim
->io_min
);
1474 unsigned int alignment
= sector_div(sector
, granularity
>> 9) << 9;
1476 return (granularity
+ lim
->alignment_offset
- alignment
) % granularity
;
1479 static inline int bdev_alignment_offset(struct block_device
*bdev
)
1481 struct request_queue
*q
= bdev_get_queue(bdev
);
1483 if (q
->limits
.misaligned
)
1486 if (bdev
!= bdev
->bd_contains
)
1487 return bdev
->bd_part
->alignment_offset
;
1489 return q
->limits
.alignment_offset
;
1492 static inline int queue_discard_alignment(struct request_queue
*q
)
1494 if (q
->limits
.discard_misaligned
)
1497 return q
->limits
.discard_alignment
;
1500 static inline int queue_limit_discard_alignment(struct queue_limits
*lim
, sector_t sector
)
1502 unsigned int alignment
, granularity
, offset
;
1504 if (!lim
->max_discard_sectors
)
1507 /* Why are these in bytes, not sectors? */
1508 alignment
= lim
->discard_alignment
>> 9;
1509 granularity
= lim
->discard_granularity
>> 9;
1513 /* Offset of the partition start in 'granularity' sectors */
1514 offset
= sector_div(sector
, granularity
);
1516 /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1517 offset
= (granularity
+ alignment
- offset
) % granularity
;
1519 /* Turn it back into bytes, gaah */
1523 static inline int bdev_discard_alignment(struct block_device
*bdev
)
1525 struct request_queue
*q
= bdev_get_queue(bdev
);
1527 if (bdev
!= bdev
->bd_contains
)
1528 return bdev
->bd_part
->discard_alignment
;
1530 return q
->limits
.discard_alignment
;
1533 static inline unsigned int queue_discard_zeroes_data(struct request_queue
*q
)
1535 if (q
->limits
.max_discard_sectors
&& q
->limits
.discard_zeroes_data
== 1)
1541 static inline unsigned int bdev_discard_zeroes_data(struct block_device
*bdev
)
1543 return queue_discard_zeroes_data(bdev_get_queue(bdev
));
1546 static inline unsigned int bdev_write_same(struct block_device
*bdev
)
1548 struct request_queue
*q
= bdev_get_queue(bdev
);
1551 return q
->limits
.max_write_same_sectors
;
1556 static inline unsigned int bdev_write_zeroes_sectors(struct block_device
*bdev
)
1558 struct request_queue
*q
= bdev_get_queue(bdev
);
1561 return q
->limits
.max_write_zeroes_sectors
;
1566 static inline enum blk_zoned_model
bdev_zoned_model(struct block_device
*bdev
)
1568 struct request_queue
*q
= bdev_get_queue(bdev
);
1571 return blk_queue_zoned_model(q
);
1573 return BLK_ZONED_NONE
;
1576 static inline bool bdev_is_zoned(struct block_device
*bdev
)
1578 struct request_queue
*q
= bdev_get_queue(bdev
);
1581 return blk_queue_is_zoned(q
);
1586 static inline unsigned int bdev_zone_sectors(struct block_device
*bdev
)
1588 struct request_queue
*q
= bdev_get_queue(bdev
);
1591 return blk_queue_zone_sectors(q
);
1596 static inline int queue_dma_alignment(struct request_queue
*q
)
1598 return q
? q
->dma_alignment
: 511;
1601 static inline int blk_rq_aligned(struct request_queue
*q
, unsigned long addr
,
1604 unsigned int alignment
= queue_dma_alignment(q
) | q
->dma_pad_mask
;
1605 return !(addr
& alignment
) && !(len
& alignment
);
1608 /* assumes size > 256 */
1609 static inline unsigned int blksize_bits(unsigned int size
)
1611 unsigned int bits
= 8;
1615 } while (size
> 256);
1619 static inline unsigned int block_size(struct block_device
*bdev
)
1621 return bdev
->bd_block_size
;
1624 static inline bool queue_flush_queueable(struct request_queue
*q
)
1626 return !test_bit(QUEUE_FLAG_FLUSH_NQ
, &q
->queue_flags
);
1629 typedef struct {struct page
*v
;} Sector
;
1631 unsigned char *read_dev_sector(struct block_device
*, sector_t
, Sector
*);
1633 static inline void put_dev_sector(Sector p
)
1638 static inline bool __bvec_gap_to_prev(struct request_queue
*q
,
1639 struct bio_vec
*bprv
, unsigned int offset
)
1642 ((bprv
->bv_offset
+ bprv
->bv_len
) & queue_virt_boundary(q
));
1646 * Check if adding a bio_vec after bprv with offset would create a gap in
1647 * the SG list. Most drivers don't care about this, but some do.
1649 static inline bool bvec_gap_to_prev(struct request_queue
*q
,
1650 struct bio_vec
*bprv
, unsigned int offset
)
1652 if (!queue_virt_boundary(q
))
1654 return __bvec_gap_to_prev(q
, bprv
, offset
);
1658 * Check if the two bvecs from two bios can be merged to one segment.
1659 * If yes, no need to check gap between the two bios since the 1st bio
1660 * and the 1st bvec in the 2nd bio can be handled in one segment.
1662 static inline bool bios_segs_mergeable(struct request_queue
*q
,
1663 struct bio
*prev
, struct bio_vec
*prev_last_bv
,
1664 struct bio_vec
*next_first_bv
)
1666 if (!BIOVEC_PHYS_MERGEABLE(prev_last_bv
, next_first_bv
))
1668 if (!BIOVEC_SEG_BOUNDARY(q
, prev_last_bv
, next_first_bv
))
1670 if (prev
->bi_seg_back_size
+ next_first_bv
->bv_len
>
1671 queue_max_segment_size(q
))
1676 static inline bool bio_will_gap(struct request_queue
*q
, struct bio
*prev
,
1679 if (bio_has_data(prev
) && queue_virt_boundary(q
)) {
1680 struct bio_vec pb
, nb
;
1682 bio_get_last_bvec(prev
, &pb
);
1683 bio_get_first_bvec(next
, &nb
);
1685 if (!bios_segs_mergeable(q
, prev
, &pb
, &nb
))
1686 return __bvec_gap_to_prev(q
, &pb
, nb
.bv_offset
);
1692 static inline bool req_gap_back_merge(struct request
*req
, struct bio
*bio
)
1694 return bio_will_gap(req
->q
, req
->biotail
, bio
);
1697 static inline bool req_gap_front_merge(struct request
*req
, struct bio
*bio
)
1699 return bio_will_gap(req
->q
, bio
, req
->bio
);
1702 int kblockd_schedule_work(struct work_struct
*work
);
1703 int kblockd_schedule_work_on(int cpu
, struct work_struct
*work
);
1704 int kblockd_schedule_delayed_work(struct delayed_work
*dwork
, unsigned long delay
);
1705 int kblockd_schedule_delayed_work_on(int cpu
, struct delayed_work
*dwork
, unsigned long delay
);
1707 #ifdef CONFIG_BLK_CGROUP
1709 * This should not be using sched_clock(). A real patch is in progress
1710 * to fix this up, until that is in place we need to disable preemption
1711 * around sched_clock() in this function and set_io_start_time_ns().
1713 static inline void set_start_time_ns(struct request
*req
)
1716 req
->start_time_ns
= sched_clock();
1720 static inline void set_io_start_time_ns(struct request
*req
)
1723 req
->io_start_time_ns
= sched_clock();
1727 static inline uint64_t rq_start_time_ns(struct request
*req
)
1729 return req
->start_time_ns
;
1732 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1734 return req
->io_start_time_ns
;
1737 static inline void set_start_time_ns(struct request
*req
) {}
1738 static inline void set_io_start_time_ns(struct request
*req
) {}
1739 static inline uint64_t rq_start_time_ns(struct request
*req
)
1743 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1749 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1750 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1751 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1752 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1754 #if defined(CONFIG_BLK_DEV_INTEGRITY)
1756 enum blk_integrity_flags
{
1757 BLK_INTEGRITY_VERIFY
= 1 << 0,
1758 BLK_INTEGRITY_GENERATE
= 1 << 1,
1759 BLK_INTEGRITY_DEVICE_CAPABLE
= 1 << 2,
1760 BLK_INTEGRITY_IP_CHECKSUM
= 1 << 3,
1763 struct blk_integrity_iter
{
1767 unsigned int data_size
;
1768 unsigned short interval
;
1769 const char *disk_name
;
1772 typedef int (integrity_processing_fn
) (struct blk_integrity_iter
*);
1774 struct blk_integrity_profile
{
1775 integrity_processing_fn
*generate_fn
;
1776 integrity_processing_fn
*verify_fn
;
1780 extern void blk_integrity_register(struct gendisk
*, struct blk_integrity
*);
1781 extern void blk_integrity_unregister(struct gendisk
*);
1782 extern int blk_integrity_compare(struct gendisk
*, struct gendisk
*);
1783 extern int blk_rq_map_integrity_sg(struct request_queue
*, struct bio
*,
1784 struct scatterlist
*);
1785 extern int blk_rq_count_integrity_sg(struct request_queue
*, struct bio
*);
1786 extern bool blk_integrity_merge_rq(struct request_queue
*, struct request
*,
1788 extern bool blk_integrity_merge_bio(struct request_queue
*, struct request
*,
1791 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1793 struct blk_integrity
*bi
= &disk
->queue
->integrity
;
1802 struct blk_integrity
*bdev_get_integrity(struct block_device
*bdev
)
1804 return blk_get_integrity(bdev
->bd_disk
);
1807 static inline bool blk_integrity_rq(struct request
*rq
)
1809 return rq
->cmd_flags
& REQ_INTEGRITY
;
1812 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1815 q
->limits
.max_integrity_segments
= segs
;
1818 static inline unsigned short
1819 queue_max_integrity_segments(struct request_queue
*q
)
1821 return q
->limits
.max_integrity_segments
;
1824 static inline bool integrity_req_gap_back_merge(struct request
*req
,
1827 struct bio_integrity_payload
*bip
= bio_integrity(req
->bio
);
1828 struct bio_integrity_payload
*bip_next
= bio_integrity(next
);
1830 return bvec_gap_to_prev(req
->q
, &bip
->bip_vec
[bip
->bip_vcnt
- 1],
1831 bip_next
->bip_vec
[0].bv_offset
);
1834 static inline bool integrity_req_gap_front_merge(struct request
*req
,
1837 struct bio_integrity_payload
*bip
= bio_integrity(bio
);
1838 struct bio_integrity_payload
*bip_next
= bio_integrity(req
->bio
);
1840 return bvec_gap_to_prev(req
->q
, &bip
->bip_vec
[bip
->bip_vcnt
- 1],
1841 bip_next
->bip_vec
[0].bv_offset
);
1844 #else /* CONFIG_BLK_DEV_INTEGRITY */
1847 struct block_device
;
1849 struct blk_integrity
;
1851 static inline int blk_integrity_rq(struct request
*rq
)
1855 static inline int blk_rq_count_integrity_sg(struct request_queue
*q
,
1860 static inline int blk_rq_map_integrity_sg(struct request_queue
*q
,
1862 struct scatterlist
*s
)
1866 static inline struct blk_integrity
*bdev_get_integrity(struct block_device
*b
)
1870 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1874 static inline int blk_integrity_compare(struct gendisk
*a
, struct gendisk
*b
)
1878 static inline void blk_integrity_register(struct gendisk
*d
,
1879 struct blk_integrity
*b
)
1882 static inline void blk_integrity_unregister(struct gendisk
*d
)
1885 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1889 static inline unsigned short queue_max_integrity_segments(struct request_queue
*q
)
1893 static inline bool blk_integrity_merge_rq(struct request_queue
*rq
,
1899 static inline bool blk_integrity_merge_bio(struct request_queue
*rq
,
1906 static inline bool integrity_req_gap_back_merge(struct request
*req
,
1911 static inline bool integrity_req_gap_front_merge(struct request
*req
,
1917 #endif /* CONFIG_BLK_DEV_INTEGRITY */
1920 * struct blk_dax_ctl - control and output parameters for ->direct_access
1921 * @sector: (input) offset relative to a block_device
1922 * @addr: (output) kernel virtual address for @sector populated by driver
1923 * @pfn: (output) page frame number for @addr populated by driver
1924 * @size: (input) number of bytes requested
1926 struct blk_dax_ctl
{
1933 struct block_device_operations
{
1934 int (*open
) (struct block_device
*, fmode_t
);
1935 void (*release
) (struct gendisk
*, fmode_t
);
1936 int (*rw_page
)(struct block_device
*, sector_t
, struct page
*, bool);
1937 int (*ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1938 int (*compat_ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1939 long (*direct_access
)(struct block_device
*, sector_t
, void **, pfn_t
*,
1941 unsigned int (*check_events
) (struct gendisk
*disk
,
1942 unsigned int clearing
);
1943 /* ->media_changed() is DEPRECATED, use ->check_events() instead */
1944 int (*media_changed
) (struct gendisk
*);
1945 void (*unlock_native_capacity
) (struct gendisk
*);
1946 int (*revalidate_disk
) (struct gendisk
*);
1947 int (*getgeo
)(struct block_device
*, struct hd_geometry
*);
1948 /* this callback is with swap_lock and sometimes page table lock held */
1949 void (*swap_slot_free_notify
) (struct block_device
*, unsigned long);
1950 struct module
*owner
;
1951 const struct pr_ops
*pr_ops
;
1954 extern int __blkdev_driver_ioctl(struct block_device
*, fmode_t
, unsigned int,
1956 extern int bdev_read_page(struct block_device
*, sector_t
, struct page
*);
1957 extern int bdev_write_page(struct block_device
*, sector_t
, struct page
*,
1958 struct writeback_control
*);
1959 extern long bdev_direct_access(struct block_device
*, struct blk_dax_ctl
*);
1960 extern int bdev_dax_supported(struct super_block
*, int);
1961 extern bool bdev_dax_capable(struct block_device
*);
1962 #else /* CONFIG_BLOCK */
1964 struct block_device
;
1967 * stubs for when the block layer is configured out
1969 #define buffer_heads_over_limit 0
1971 static inline long nr_blockdev_pages(void)
1979 static inline void blk_start_plug(struct blk_plug
*plug
)
1983 static inline void blk_finish_plug(struct blk_plug
*plug
)
1987 static inline void blk_flush_plug(struct task_struct
*task
)
1991 static inline void blk_schedule_flush_plug(struct task_struct
*task
)
1996 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
2001 static inline int blkdev_issue_flush(struct block_device
*bdev
, gfp_t gfp_mask
,
2002 sector_t
*error_sector
)
2007 #endif /* CONFIG_BLOCK */