1 #ifndef _LINUX_BLKDEV_H
2 #define _LINUX_BLKDEV_H
4 #include <linux/sched.h>
5 #include <linux/sched/clock.h>
9 #include <linux/major.h>
10 #include <linux/genhd.h>
11 #include <linux/list.h>
12 #include <linux/llist.h>
13 #include <linux/timer.h>
14 #include <linux/workqueue.h>
15 #include <linux/pagemap.h>
16 #include <linux/backing-dev-defs.h>
17 #include <linux/wait.h>
18 #include <linux/mempool.h>
19 #include <linux/pfn.h>
20 #include <linux/bio.h>
21 #include <linux/stringify.h>
22 #include <linux/gfp.h>
23 #include <linux/bsg.h>
24 #include <linux/smp.h>
25 #include <linux/rcupdate.h>
26 #include <linux/percpu-refcount.h>
27 #include <linux/scatterlist.h>
28 #include <linux/blkzoned.h>
31 struct scsi_ioctl_command
;
34 struct elevator_queue
;
40 struct blk_flush_queue
;
44 #define BLKDEV_MIN_RQ 4
45 #define BLKDEV_MAX_RQ 128 /* Default maximum */
48 * Maximum number of blkcg policies allowed to be registered concurrently.
49 * Defined here to simplify include dependency.
51 #define BLKCG_MAX_POLS 2
53 typedef void (rq_end_io_fn
)(struct request
*, int);
55 #define BLK_RL_SYNCFULL (1U << 0)
56 #define BLK_RL_ASYNCFULL (1U << 1)
59 struct request_queue
*q
; /* the queue this rl belongs to */
60 #ifdef CONFIG_BLK_CGROUP
61 struct blkcg_gq
*blkg
; /* blkg this request pool belongs to */
64 * count[], starved[], and wait[] are indexed by
65 * BLK_RW_SYNC/BLK_RW_ASYNC
70 wait_queue_head_t wait
[2];
76 typedef __u32 __bitwise req_flags_t
;
78 /* elevator knows about this request */
79 #define RQF_SORTED ((__force req_flags_t)(1 << 0))
80 /* drive already may have started this one */
81 #define RQF_STARTED ((__force req_flags_t)(1 << 1))
82 /* uses tagged queueing */
83 #define RQF_QUEUED ((__force req_flags_t)(1 << 2))
84 /* may not be passed by ioscheduler */
85 #define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3))
86 /* request for flush sequence */
87 #define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4))
88 /* merge of different types, fail separately */
89 #define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5))
90 /* track inflight for MQ */
91 #define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6))
92 /* don't call prep for this one */
93 #define RQF_DONTPREP ((__force req_flags_t)(1 << 7))
94 /* set for "ide_preempt" requests and also for requests for which the SCSI
95 "quiesce" state must be ignored. */
96 #define RQF_PREEMPT ((__force req_flags_t)(1 << 8))
97 /* contains copies of user pages */
98 #define RQF_COPY_USER ((__force req_flags_t)(1 << 9))
99 /* vaguely specified driver internal error. Ignored by the block layer */
100 #define RQF_FAILED ((__force req_flags_t)(1 << 10))
101 /* don't warn about errors */
102 #define RQF_QUIET ((__force req_flags_t)(1 << 11))
103 /* elevator private data attached */
104 #define RQF_ELVPRIV ((__force req_flags_t)(1 << 12))
105 /* account I/O stat */
106 #define RQF_IO_STAT ((__force req_flags_t)(1 << 13))
107 /* request came from our alloc pool */
108 #define RQF_ALLOCED ((__force req_flags_t)(1 << 14))
109 /* runtime pm request */
110 #define RQF_PM ((__force req_flags_t)(1 << 15))
111 /* on IO scheduler merge hash */
112 #define RQF_HASHED ((__force req_flags_t)(1 << 16))
113 /* IO stats tracking on */
114 #define RQF_STATS ((__force req_flags_t)(1 << 17))
115 /* Look at ->special_vec for the actual data payload instead of the
117 #define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18))
119 /* flags that prevent us from merging requests: */
120 #define RQF_NOMERGE_FLAGS \
121 (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD)
124 * Try to put the fields that are referenced together in the same cacheline.
126 * If you modify this structure, make sure to update blk_rq_init() and
127 * especially blk_mq_rq_ctx_init() to take care of the added fields.
130 struct list_head queuelist
;
132 struct call_single_data csd
;
136 struct request_queue
*q
;
137 struct blk_mq_ctx
*mq_ctx
;
140 unsigned int cmd_flags
; /* op and common flags */
141 req_flags_t rq_flags
;
145 unsigned long atomic_flags
;
147 /* the following two fields are internal, NEVER access directly */
148 unsigned int __data_len
; /* total data len */
150 sector_t __sector
; /* sector cursor */
156 * The hash is used inside the scheduler, and killed once the
157 * request reaches the dispatch list. The ipi_list is only used
158 * to queue the request for softirq completion, which is long
159 * after the request has been unhashed (and even removed from
160 * the dispatch list).
163 struct hlist_node hash
; /* merge hash */
164 struct list_head ipi_list
;
168 * The rb_node is only used inside the io scheduler, requests
169 * are pruned when moved to the dispatch queue. So let the
170 * completion_data share space with the rb_node.
173 struct rb_node rb_node
; /* sort/lookup */
174 struct bio_vec special_vec
;
175 void *completion_data
;
179 * Three pointers are available for the IO schedulers, if they need
180 * more they have to dynamically allocate it. Flush requests are
181 * never put on the IO scheduler. So let the flush fields share
182 * space with the elevator data.
192 struct list_head list
;
193 rq_end_io_fn
*saved_end_io
;
197 struct gendisk
*rq_disk
;
198 struct hd_struct
*part
;
199 unsigned long start_time
;
200 struct blk_issue_stat issue_stat
;
201 #ifdef CONFIG_BLK_CGROUP
202 struct request_list
*rl
; /* rl this rq is alloced from */
203 unsigned long long start_time_ns
;
204 unsigned long long io_start_time_ns
; /* when passed to hardware */
206 /* Number of scatter-gather DMA addr+len pairs after
207 * physical address coalescing is performed.
209 unsigned short nr_phys_segments
;
210 #if defined(CONFIG_BLK_DEV_INTEGRITY)
211 unsigned short nr_integrity_segments
;
214 unsigned short ioprio
;
216 void *special
; /* opaque pointer available for LLD use */
220 unsigned int extra_len
; /* length of alignment and padding */
222 unsigned long deadline
;
223 struct list_head timeout_list
;
224 unsigned int timeout
;
228 * completion callback.
230 rq_end_io_fn
*end_io
;
234 struct request
*next_rq
;
237 static inline bool blk_rq_is_scsi(struct request
*rq
)
239 return req_op(rq
) == REQ_OP_SCSI_IN
|| req_op(rq
) == REQ_OP_SCSI_OUT
;
242 static inline bool blk_rq_is_private(struct request
*rq
)
244 return req_op(rq
) == REQ_OP_DRV_IN
|| req_op(rq
) == REQ_OP_DRV_OUT
;
247 static inline bool blk_rq_is_passthrough(struct request
*rq
)
249 return blk_rq_is_scsi(rq
) || blk_rq_is_private(rq
);
252 static inline unsigned short req_get_ioprio(struct request
*req
)
257 #include <linux/elevator.h>
259 struct blk_queue_ctx
;
261 typedef void (request_fn_proc
) (struct request_queue
*q
);
262 typedef blk_qc_t (make_request_fn
) (struct request_queue
*q
, struct bio
*bio
);
263 typedef int (prep_rq_fn
) (struct request_queue
*, struct request
*);
264 typedef void (unprep_rq_fn
) (struct request_queue
*, struct request
*);
267 typedef void (softirq_done_fn
)(struct request
*);
268 typedef int (dma_drain_needed_fn
)(struct request
*);
269 typedef int (lld_busy_fn
) (struct request_queue
*q
);
270 typedef int (bsg_job_fn
) (struct bsg_job
*);
271 typedef int (init_rq_fn
)(struct request_queue
*, struct request
*, gfp_t
);
272 typedef void (exit_rq_fn
)(struct request_queue
*, struct request
*);
274 enum blk_eh_timer_return
{
280 typedef enum blk_eh_timer_return (rq_timed_out_fn
)(struct request
*);
282 enum blk_queue_state
{
287 struct blk_queue_tag
{
288 struct request
**tag_index
; /* map of busy tags */
289 unsigned long *tag_map
; /* bit map of free/busy tags */
290 int max_depth
; /* what we will send to device */
291 int real_max_depth
; /* what the array can hold */
292 atomic_t refcnt
; /* map can be shared */
293 int alloc_policy
; /* tag allocation policy */
294 int next_tag
; /* next tag */
296 #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */
297 #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */
299 #define BLK_SCSI_MAX_CMDS (256)
300 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
303 * Zoned block device models (zoned limit).
305 enum blk_zoned_model
{
306 BLK_ZONED_NONE
, /* Regular block device */
307 BLK_ZONED_HA
, /* Host-aware zoned block device */
308 BLK_ZONED_HM
, /* Host-managed zoned block device */
311 struct queue_limits
{
312 unsigned long bounce_pfn
;
313 unsigned long seg_boundary_mask
;
314 unsigned long virt_boundary_mask
;
316 unsigned int max_hw_sectors
;
317 unsigned int max_dev_sectors
;
318 unsigned int chunk_sectors
;
319 unsigned int max_sectors
;
320 unsigned int max_segment_size
;
321 unsigned int physical_block_size
;
322 unsigned int alignment_offset
;
325 unsigned int max_discard_sectors
;
326 unsigned int max_hw_discard_sectors
;
327 unsigned int max_write_same_sectors
;
328 unsigned int max_write_zeroes_sectors
;
329 unsigned int discard_granularity
;
330 unsigned int discard_alignment
;
332 unsigned short logical_block_size
;
333 unsigned short max_segments
;
334 unsigned short max_integrity_segments
;
335 unsigned short max_discard_segments
;
337 unsigned char misaligned
;
338 unsigned char discard_misaligned
;
339 unsigned char cluster
;
340 unsigned char discard_zeroes_data
;
341 unsigned char raid_partial_stripes_expensive
;
342 enum blk_zoned_model zoned
;
345 #ifdef CONFIG_BLK_DEV_ZONED
347 struct blk_zone_report_hdr
{
348 unsigned int nr_zones
;
352 extern int blkdev_report_zones(struct block_device
*bdev
,
353 sector_t sector
, struct blk_zone
*zones
,
354 unsigned int *nr_zones
, gfp_t gfp_mask
);
355 extern int blkdev_reset_zones(struct block_device
*bdev
, sector_t sectors
,
356 sector_t nr_sectors
, gfp_t gfp_mask
);
358 extern int blkdev_report_zones_ioctl(struct block_device
*bdev
, fmode_t mode
,
359 unsigned int cmd
, unsigned long arg
);
360 extern int blkdev_reset_zones_ioctl(struct block_device
*bdev
, fmode_t mode
,
361 unsigned int cmd
, unsigned long arg
);
363 #else /* CONFIG_BLK_DEV_ZONED */
365 static inline int blkdev_report_zones_ioctl(struct block_device
*bdev
,
366 fmode_t mode
, unsigned int cmd
,
372 static inline int blkdev_reset_zones_ioctl(struct block_device
*bdev
,
373 fmode_t mode
, unsigned int cmd
,
379 #endif /* CONFIG_BLK_DEV_ZONED */
381 struct request_queue
{
383 * Together with queue_head for cacheline sharing
385 struct list_head queue_head
;
386 struct request
*last_merge
;
387 struct elevator_queue
*elevator
;
388 int nr_rqs
[2]; /* # allocated [a]sync rqs */
389 int nr_rqs_elvpriv
; /* # allocated rqs w/ elvpriv */
394 * If blkcg is not used, @q->root_rl serves all requests. If blkcg
395 * is used, root blkg allocates from @q->root_rl and all other
396 * blkgs from their own blkg->rl. Which one to use should be
397 * determined using bio_request_list().
399 struct request_list root_rl
;
401 request_fn_proc
*request_fn
;
402 make_request_fn
*make_request_fn
;
403 prep_rq_fn
*prep_rq_fn
;
404 unprep_rq_fn
*unprep_rq_fn
;
405 softirq_done_fn
*softirq_done_fn
;
406 rq_timed_out_fn
*rq_timed_out_fn
;
407 dma_drain_needed_fn
*dma_drain_needed
;
408 lld_busy_fn
*lld_busy_fn
;
409 init_rq_fn
*init_rq_fn
;
410 exit_rq_fn
*exit_rq_fn
;
412 const struct blk_mq_ops
*mq_ops
;
414 unsigned int *mq_map
;
417 struct blk_mq_ctx __percpu
*queue_ctx
;
418 unsigned int nr_queues
;
420 unsigned int queue_depth
;
422 /* hw dispatch queues */
423 struct blk_mq_hw_ctx
**queue_hw_ctx
;
424 unsigned int nr_hw_queues
;
427 * Dispatch queue sorting
430 struct request
*boundary_rq
;
433 * Delayed queue handling
435 struct delayed_work delay_work
;
437 struct backing_dev_info
*backing_dev_info
;
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 */
614 #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
615 (1 << QUEUE_FLAG_STACKABLE) | \
616 (1 << QUEUE_FLAG_SAME_COMP) | \
617 (1 << QUEUE_FLAG_ADD_RANDOM))
619 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
620 (1 << QUEUE_FLAG_STACKABLE) | \
621 (1 << QUEUE_FLAG_SAME_COMP) | \
622 (1 << QUEUE_FLAG_POLL))
624 static inline void queue_lockdep_assert_held(struct request_queue
*q
)
627 lockdep_assert_held(q
->queue_lock
);
630 static inline void queue_flag_set_unlocked(unsigned int flag
,
631 struct request_queue
*q
)
633 __set_bit(flag
, &q
->queue_flags
);
636 static inline int queue_flag_test_and_clear(unsigned int flag
,
637 struct request_queue
*q
)
639 queue_lockdep_assert_held(q
);
641 if (test_bit(flag
, &q
->queue_flags
)) {
642 __clear_bit(flag
, &q
->queue_flags
);
649 static inline int queue_flag_test_and_set(unsigned int flag
,
650 struct request_queue
*q
)
652 queue_lockdep_assert_held(q
);
654 if (!test_bit(flag
, &q
->queue_flags
)) {
655 __set_bit(flag
, &q
->queue_flags
);
662 static inline void queue_flag_set(unsigned int flag
, struct request_queue
*q
)
664 queue_lockdep_assert_held(q
);
665 __set_bit(flag
, &q
->queue_flags
);
668 static inline void queue_flag_clear_unlocked(unsigned int flag
,
669 struct request_queue
*q
)
671 __clear_bit(flag
, &q
->queue_flags
);
674 static inline int queue_in_flight(struct request_queue
*q
)
676 return q
->in_flight
[0] + q
->in_flight
[1];
679 static inline void queue_flag_clear(unsigned int flag
, struct request_queue
*q
)
681 queue_lockdep_assert_held(q
);
682 __clear_bit(flag
, &q
->queue_flags
);
685 #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
686 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
687 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
688 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
689 #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags)
690 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
691 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
692 #define blk_queue_noxmerges(q) \
693 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
694 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
695 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
696 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
697 #define blk_queue_stackable(q) \
698 test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
699 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
700 #define blk_queue_secure_erase(q) \
701 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
702 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
704 #define blk_noretry_request(rq) \
705 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
706 REQ_FAILFAST_DRIVER))
708 static inline bool blk_account_rq(struct request
*rq
)
710 return (rq
->rq_flags
& RQF_STARTED
) && !blk_rq_is_passthrough(rq
);
713 #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
714 #define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
715 /* rq->queuelist of dequeued request must be list_empty() */
716 #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
718 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
720 #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ)
723 * Driver can handle struct request, if it either has an old style
724 * request_fn defined, or is blk-mq based.
726 static inline bool queue_is_rq_based(struct request_queue
*q
)
728 return q
->request_fn
|| q
->mq_ops
;
731 static inline unsigned int blk_queue_cluster(struct request_queue
*q
)
733 return q
->limits
.cluster
;
736 static inline enum blk_zoned_model
737 blk_queue_zoned_model(struct request_queue
*q
)
739 return q
->limits
.zoned
;
742 static inline bool blk_queue_is_zoned(struct request_queue
*q
)
744 switch (blk_queue_zoned_model(q
)) {
753 static inline unsigned int blk_queue_zone_sectors(struct request_queue
*q
)
755 return blk_queue_is_zoned(q
) ? q
->limits
.chunk_sectors
: 0;
758 static inline bool rq_is_sync(struct request
*rq
)
760 return op_is_sync(rq
->cmd_flags
);
763 static inline bool blk_rl_full(struct request_list
*rl
, bool sync
)
765 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
767 return rl
->flags
& flag
;
770 static inline void blk_set_rl_full(struct request_list
*rl
, bool sync
)
772 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
777 static inline void blk_clear_rl_full(struct request_list
*rl
, bool sync
)
779 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
784 static inline bool rq_mergeable(struct request
*rq
)
786 if (blk_rq_is_passthrough(rq
))
789 if (req_op(rq
) == REQ_OP_FLUSH
)
792 if (req_op(rq
) == REQ_OP_WRITE_ZEROES
)
795 if (rq
->cmd_flags
& REQ_NOMERGE_FLAGS
)
797 if (rq
->rq_flags
& RQF_NOMERGE_FLAGS
)
803 static inline bool blk_write_same_mergeable(struct bio
*a
, struct bio
*b
)
805 if (bio_data(a
) == bio_data(b
))
811 static inline unsigned int blk_queue_depth(struct request_queue
*q
)
814 return q
->queue_depth
;
816 return q
->nr_requests
;
820 * q->prep_rq_fn return values
823 BLKPREP_OK
, /* serve it */
824 BLKPREP_KILL
, /* fatal error, kill, return -EIO */
825 BLKPREP_DEFER
, /* leave on queue */
826 BLKPREP_INVALID
, /* invalid command, kill, return -EREMOTEIO */
829 extern unsigned long blk_max_low_pfn
, blk_max_pfn
;
832 * standard bounce addresses:
834 * BLK_BOUNCE_HIGH : bounce all highmem pages
835 * BLK_BOUNCE_ANY : don't bounce anything
836 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
839 #if BITS_PER_LONG == 32
840 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
842 #define BLK_BOUNCE_HIGH -1ULL
844 #define BLK_BOUNCE_ANY (-1ULL)
845 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
848 * default timeout for SG_IO if none specified
850 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
851 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
854 extern int init_emergency_isa_pool(void);
855 extern void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
);
857 static inline int init_emergency_isa_pool(void)
861 static inline void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
)
864 #endif /* CONFIG_MMU */
870 unsigned long offset
;
875 struct req_iterator
{
876 struct bvec_iter iter
;
880 /* This should not be used directly - use rq_for_each_segment */
881 #define for_each_bio(_bio) \
882 for (; _bio; _bio = _bio->bi_next)
883 #define __rq_for_each_bio(_bio, rq) \
885 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
887 #define rq_for_each_segment(bvl, _rq, _iter) \
888 __rq_for_each_bio(_iter.bio, _rq) \
889 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
891 #define rq_iter_last(bvec, _iter) \
892 (_iter.bio->bi_next == NULL && \
893 bio_iter_last(bvec, _iter.iter))
895 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
896 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
898 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
899 extern void rq_flush_dcache_pages(struct request
*rq
);
901 static inline void rq_flush_dcache_pages(struct request
*rq
)
907 #define vfs_msg(sb, level, fmt, ...) \
908 __vfs_msg(sb, level, fmt, ##__VA_ARGS__)
910 #define vfs_msg(sb, level, fmt, ...) \
912 no_printk(fmt, ##__VA_ARGS__); \
913 __vfs_msg(sb, "", " "); \
917 extern int blk_register_queue(struct gendisk
*disk
);
918 extern void blk_unregister_queue(struct gendisk
*disk
);
919 extern blk_qc_t
generic_make_request(struct bio
*bio
);
920 extern void blk_rq_init(struct request_queue
*q
, struct request
*rq
);
921 extern void blk_put_request(struct request
*);
922 extern void __blk_put_request(struct request_queue
*, struct request
*);
923 extern struct request
*blk_get_request(struct request_queue
*, int, gfp_t
);
924 extern void blk_requeue_request(struct request_queue
*, struct request
*);
925 extern int blk_lld_busy(struct request_queue
*q
);
926 extern int blk_rq_prep_clone(struct request
*rq
, struct request
*rq_src
,
927 struct bio_set
*bs
, gfp_t gfp_mask
,
928 int (*bio_ctr
)(struct bio
*, struct bio
*, void *),
930 extern void blk_rq_unprep_clone(struct request
*rq
);
931 extern int blk_insert_cloned_request(struct request_queue
*q
,
933 extern int blk_rq_append_bio(struct request
*rq
, struct bio
*bio
);
934 extern void blk_delay_queue(struct request_queue
*, unsigned long);
935 extern void blk_queue_split(struct request_queue
*, struct bio
**,
937 extern void blk_recount_segments(struct request_queue
*, struct bio
*);
938 extern int scsi_verify_blk_ioctl(struct block_device
*, unsigned int);
939 extern int scsi_cmd_blk_ioctl(struct block_device
*, fmode_t
,
940 unsigned int, void __user
*);
941 extern int scsi_cmd_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
942 unsigned int, void __user
*);
943 extern int sg_scsi_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
944 struct scsi_ioctl_command __user
*);
946 extern int blk_queue_enter(struct request_queue
*q
, bool nowait
);
947 extern void blk_queue_exit(struct request_queue
*q
);
948 extern void blk_start_queue(struct request_queue
*q
);
949 extern void blk_start_queue_async(struct request_queue
*q
);
950 extern void blk_stop_queue(struct request_queue
*q
);
951 extern void blk_sync_queue(struct request_queue
*q
);
952 extern void __blk_stop_queue(struct request_queue
*q
);
953 extern void __blk_run_queue(struct request_queue
*q
);
954 extern void __blk_run_queue_uncond(struct request_queue
*q
);
955 extern void blk_run_queue(struct request_queue
*);
956 extern void blk_run_queue_async(struct request_queue
*q
);
957 extern void blk_mq_quiesce_queue(struct request_queue
*q
);
958 extern int blk_rq_map_user(struct request_queue
*, struct request
*,
959 struct rq_map_data
*, void __user
*, unsigned long,
961 extern int blk_rq_unmap_user(struct bio
*);
962 extern int blk_rq_map_kern(struct request_queue
*, struct request
*, void *, unsigned int, gfp_t
);
963 extern int blk_rq_map_user_iov(struct request_queue
*, struct request
*,
964 struct rq_map_data
*, const struct iov_iter
*,
966 extern int blk_execute_rq(struct request_queue
*, struct gendisk
*,
967 struct request
*, int);
968 extern void blk_execute_rq_nowait(struct request_queue
*, struct gendisk
*,
969 struct request
*, int, rq_end_io_fn
*);
971 bool blk_mq_poll(struct request_queue
*q
, blk_qc_t cookie
);
973 static inline struct request_queue
*bdev_get_queue(struct block_device
*bdev
)
975 return bdev
->bd_disk
->queue
; /* this is never NULL */
979 * blk_rq_pos() : the current sector
980 * blk_rq_bytes() : bytes left in the entire request
981 * blk_rq_cur_bytes() : bytes left in the current segment
982 * blk_rq_err_bytes() : bytes left till the next error boundary
983 * blk_rq_sectors() : sectors left in the entire request
984 * blk_rq_cur_sectors() : sectors left in the current segment
986 static inline sector_t
blk_rq_pos(const struct request
*rq
)
991 static inline unsigned int blk_rq_bytes(const struct request
*rq
)
993 return rq
->__data_len
;
996 static inline int blk_rq_cur_bytes(const struct request
*rq
)
998 return rq
->bio
? bio_cur_bytes(rq
->bio
) : 0;
1001 extern unsigned int blk_rq_err_bytes(const struct request
*rq
);
1003 static inline unsigned int blk_rq_sectors(const struct request
*rq
)
1005 return blk_rq_bytes(rq
) >> 9;
1008 static inline unsigned int blk_rq_cur_sectors(const struct request
*rq
)
1010 return blk_rq_cur_bytes(rq
) >> 9;
1014 * Some commands like WRITE SAME have a payload or data transfer size which
1015 * is different from the size of the request. Any driver that supports such
1016 * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to
1017 * calculate the data transfer size.
1019 static inline unsigned int blk_rq_payload_bytes(struct request
*rq
)
1021 if (rq
->rq_flags
& RQF_SPECIAL_PAYLOAD
)
1022 return rq
->special_vec
.bv_len
;
1023 return blk_rq_bytes(rq
);
1026 static inline unsigned int blk_queue_get_max_sectors(struct request_queue
*q
,
1029 if (unlikely(op
== REQ_OP_DISCARD
|| op
== REQ_OP_SECURE_ERASE
))
1030 return min(q
->limits
.max_discard_sectors
, UINT_MAX
>> 9);
1032 if (unlikely(op
== REQ_OP_WRITE_SAME
))
1033 return q
->limits
.max_write_same_sectors
;
1035 if (unlikely(op
== REQ_OP_WRITE_ZEROES
))
1036 return q
->limits
.max_write_zeroes_sectors
;
1038 return q
->limits
.max_sectors
;
1042 * Return maximum size of a request at given offset. Only valid for
1043 * file system requests.
1045 static inline unsigned int blk_max_size_offset(struct request_queue
*q
,
1048 if (!q
->limits
.chunk_sectors
)
1049 return q
->limits
.max_sectors
;
1051 return q
->limits
.chunk_sectors
-
1052 (offset
& (q
->limits
.chunk_sectors
- 1));
1055 static inline unsigned int blk_rq_get_max_sectors(struct request
*rq
,
1058 struct request_queue
*q
= rq
->q
;
1060 if (blk_rq_is_passthrough(rq
))
1061 return q
->limits
.max_hw_sectors
;
1063 if (!q
->limits
.chunk_sectors
||
1064 req_op(rq
) == REQ_OP_DISCARD
||
1065 req_op(rq
) == REQ_OP_SECURE_ERASE
)
1066 return blk_queue_get_max_sectors(q
, req_op(rq
));
1068 return min(blk_max_size_offset(q
, offset
),
1069 blk_queue_get_max_sectors(q
, req_op(rq
)));
1072 static inline unsigned int blk_rq_count_bios(struct request
*rq
)
1074 unsigned int nr_bios
= 0;
1077 __rq_for_each_bio(bio
, rq
)
1084 * blk_rq_set_prio - associate a request with prio from ioc
1085 * @rq: request of interest
1086 * @ioc: target iocontext
1088 * Assocate request prio with ioc prio so request based drivers
1089 * can leverage priority information.
1091 static inline void blk_rq_set_prio(struct request
*rq
, struct io_context
*ioc
)
1094 rq
->ioprio
= ioc
->ioprio
;
1098 * Request issue related functions.
1100 extern struct request
*blk_peek_request(struct request_queue
*q
);
1101 extern void blk_start_request(struct request
*rq
);
1102 extern struct request
*blk_fetch_request(struct request_queue
*q
);
1105 * Request completion related functions.
1107 * blk_update_request() completes given number of bytes and updates
1108 * the request without completing it.
1110 * blk_end_request() and friends. __blk_end_request() must be called
1111 * with the request queue spinlock acquired.
1113 * Several drivers define their own end_request and call
1114 * blk_end_request() for parts of the original function.
1115 * This prevents code duplication in drivers.
1117 extern bool blk_update_request(struct request
*rq
, int error
,
1118 unsigned int nr_bytes
);
1119 extern void blk_finish_request(struct request
*rq
, int error
);
1120 extern bool blk_end_request(struct request
*rq
, int error
,
1121 unsigned int nr_bytes
);
1122 extern void blk_end_request_all(struct request
*rq
, int error
);
1123 extern bool blk_end_request_cur(struct request
*rq
, int error
);
1124 extern bool blk_end_request_err(struct request
*rq
, int error
);
1125 extern bool __blk_end_request(struct request
*rq
, int error
,
1126 unsigned int nr_bytes
);
1127 extern void __blk_end_request_all(struct request
*rq
, int error
);
1128 extern bool __blk_end_request_cur(struct request
*rq
, int error
);
1129 extern bool __blk_end_request_err(struct request
*rq
, int error
);
1131 extern void blk_complete_request(struct request
*);
1132 extern void __blk_complete_request(struct request
*);
1133 extern void blk_abort_request(struct request
*);
1134 extern void blk_unprep_request(struct request
*);
1137 * Access functions for manipulating queue properties
1139 extern struct request_queue
*blk_init_queue_node(request_fn_proc
*rfn
,
1140 spinlock_t
*lock
, int node_id
);
1141 extern struct request_queue
*blk_init_queue(request_fn_proc
*, spinlock_t
*);
1142 extern int blk_init_allocated_queue(struct request_queue
*);
1143 extern void blk_cleanup_queue(struct request_queue
*);
1144 extern void blk_queue_make_request(struct request_queue
*, make_request_fn
*);
1145 extern void blk_queue_bounce_limit(struct request_queue
*, u64
);
1146 extern void blk_queue_max_hw_sectors(struct request_queue
*, unsigned int);
1147 extern void blk_queue_chunk_sectors(struct request_queue
*, unsigned int);
1148 extern void blk_queue_max_segments(struct request_queue
*, unsigned short);
1149 extern void blk_queue_max_discard_segments(struct request_queue
*,
1151 extern void blk_queue_max_segment_size(struct request_queue
*, unsigned int);
1152 extern void blk_queue_max_discard_sectors(struct request_queue
*q
,
1153 unsigned int max_discard_sectors
);
1154 extern void blk_queue_max_write_same_sectors(struct request_queue
*q
,
1155 unsigned int max_write_same_sectors
);
1156 extern void blk_queue_max_write_zeroes_sectors(struct request_queue
*q
,
1157 unsigned int max_write_same_sectors
);
1158 extern void blk_queue_logical_block_size(struct request_queue
*, unsigned short);
1159 extern void blk_queue_physical_block_size(struct request_queue
*, unsigned int);
1160 extern void blk_queue_alignment_offset(struct request_queue
*q
,
1161 unsigned int alignment
);
1162 extern void blk_limits_io_min(struct queue_limits
*limits
, unsigned int min
);
1163 extern void blk_queue_io_min(struct request_queue
*q
, unsigned int min
);
1164 extern void blk_limits_io_opt(struct queue_limits
*limits
, unsigned int opt
);
1165 extern void blk_queue_io_opt(struct request_queue
*q
, unsigned int opt
);
1166 extern void blk_set_queue_depth(struct request_queue
*q
, unsigned int depth
);
1167 extern void blk_set_default_limits(struct queue_limits
*lim
);
1168 extern void blk_set_stacking_limits(struct queue_limits
*lim
);
1169 extern int blk_stack_limits(struct queue_limits
*t
, struct queue_limits
*b
,
1171 extern int bdev_stack_limits(struct queue_limits
*t
, struct block_device
*bdev
,
1173 extern void disk_stack_limits(struct gendisk
*disk
, struct block_device
*bdev
,
1175 extern void blk_queue_stack_limits(struct request_queue
*t
, struct request_queue
*b
);
1176 extern void blk_queue_dma_pad(struct request_queue
*, unsigned int);
1177 extern void blk_queue_update_dma_pad(struct request_queue
*, unsigned int);
1178 extern int blk_queue_dma_drain(struct request_queue
*q
,
1179 dma_drain_needed_fn
*dma_drain_needed
,
1180 void *buf
, unsigned int size
);
1181 extern void blk_queue_lld_busy(struct request_queue
*q
, lld_busy_fn
*fn
);
1182 extern void blk_queue_segment_boundary(struct request_queue
*, unsigned long);
1183 extern void blk_queue_virt_boundary(struct request_queue
*, unsigned long);
1184 extern void blk_queue_prep_rq(struct request_queue
*, prep_rq_fn
*pfn
);
1185 extern void blk_queue_unprep_rq(struct request_queue
*, unprep_rq_fn
*ufn
);
1186 extern void blk_queue_dma_alignment(struct request_queue
*, int);
1187 extern void blk_queue_update_dma_alignment(struct request_queue
*, int);
1188 extern void blk_queue_softirq_done(struct request_queue
*, softirq_done_fn
*);
1189 extern void blk_queue_rq_timed_out(struct request_queue
*, rq_timed_out_fn
*);
1190 extern void blk_queue_rq_timeout(struct request_queue
*, unsigned int);
1191 extern void blk_queue_flush_queueable(struct request_queue
*q
, bool queueable
);
1192 extern void blk_queue_write_cache(struct request_queue
*q
, bool enabled
, bool fua
);
1195 * Number of physical segments as sent to the device.
1197 * Normally this is the number of discontiguous data segments sent by the
1198 * submitter. But for data-less command like discard we might have no
1199 * actual data segments submitted, but the driver might have to add it's
1200 * own special payload. In that case we still return 1 here so that this
1201 * special payload will be mapped.
1203 static inline unsigned short blk_rq_nr_phys_segments(struct request
*rq
)
1205 if (rq
->rq_flags
& RQF_SPECIAL_PAYLOAD
)
1207 return rq
->nr_phys_segments
;
1211 * Number of discard segments (or ranges) the driver needs to fill in.
1212 * Each discard bio merged into a request is counted as one segment.
1214 static inline unsigned short blk_rq_nr_discard_segments(struct request
*rq
)
1216 return max_t(unsigned short, rq
->nr_phys_segments
, 1);
1219 extern int blk_rq_map_sg(struct request_queue
*, struct request
*, struct scatterlist
*);
1220 extern void blk_dump_rq_flags(struct request
*, char *);
1221 extern long nr_blockdev_pages(void);
1223 bool __must_check
blk_get_queue(struct request_queue
*);
1224 struct request_queue
*blk_alloc_queue(gfp_t
);
1225 struct request_queue
*blk_alloc_queue_node(gfp_t
, int);
1226 extern void blk_put_queue(struct request_queue
*);
1227 extern void blk_set_queue_dying(struct request_queue
*);
1230 * block layer runtime pm functions
1233 extern void blk_pm_runtime_init(struct request_queue
*q
, struct device
*dev
);
1234 extern int blk_pre_runtime_suspend(struct request_queue
*q
);
1235 extern void blk_post_runtime_suspend(struct request_queue
*q
, int err
);
1236 extern void blk_pre_runtime_resume(struct request_queue
*q
);
1237 extern void blk_post_runtime_resume(struct request_queue
*q
, int err
);
1238 extern void blk_set_runtime_active(struct request_queue
*q
);
1240 static inline void blk_pm_runtime_init(struct request_queue
*q
,
1241 struct device
*dev
) {}
1242 static inline int blk_pre_runtime_suspend(struct request_queue
*q
)
1246 static inline void blk_post_runtime_suspend(struct request_queue
*q
, int err
) {}
1247 static inline void blk_pre_runtime_resume(struct request_queue
*q
) {}
1248 static inline void blk_post_runtime_resume(struct request_queue
*q
, int err
) {}
1249 static inline void blk_set_runtime_active(struct request_queue
*q
) {}
1253 * blk_plug permits building a queue of related requests by holding the I/O
1254 * fragments for a short period. This allows merging of sequential requests
1255 * into single larger request. As the requests are moved from a per-task list to
1256 * the device's request_queue in a batch, this results in improved scalability
1257 * as the lock contention for request_queue lock is reduced.
1259 * It is ok not to disable preemption when adding the request to the plug list
1260 * or when attempting a merge, because blk_schedule_flush_list() will only flush
1261 * the plug list when the task sleeps by itself. For details, please see
1262 * schedule() where blk_schedule_flush_plug() is called.
1265 struct list_head list
; /* requests */
1266 struct list_head mq_list
; /* blk-mq requests */
1267 struct list_head cb_list
; /* md requires an unplug callback */
1269 #define BLK_MAX_REQUEST_COUNT 16
1270 #define BLK_PLUG_FLUSH_SIZE (128 * 1024)
1273 typedef void (*blk_plug_cb_fn
)(struct blk_plug_cb
*, bool);
1274 struct blk_plug_cb
{
1275 struct list_head list
;
1276 blk_plug_cb_fn callback
;
1279 extern struct blk_plug_cb
*blk_check_plugged(blk_plug_cb_fn unplug
,
1280 void *data
, int size
);
1281 extern void blk_start_plug(struct blk_plug
*);
1282 extern void blk_finish_plug(struct blk_plug
*);
1283 extern void blk_flush_plug_list(struct blk_plug
*, bool);
1285 static inline void blk_flush_plug(struct task_struct
*tsk
)
1287 struct blk_plug
*plug
= tsk
->plug
;
1290 blk_flush_plug_list(plug
, false);
1293 static inline void blk_schedule_flush_plug(struct task_struct
*tsk
)
1295 struct blk_plug
*plug
= tsk
->plug
;
1298 blk_flush_plug_list(plug
, true);
1301 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1303 struct blk_plug
*plug
= tsk
->plug
;
1306 (!list_empty(&plug
->list
) ||
1307 !list_empty(&plug
->mq_list
) ||
1308 !list_empty(&plug
->cb_list
));
1314 extern int blk_queue_start_tag(struct request_queue
*, struct request
*);
1315 extern struct request
*blk_queue_find_tag(struct request_queue
*, int);
1316 extern void blk_queue_end_tag(struct request_queue
*, struct request
*);
1317 extern int blk_queue_init_tags(struct request_queue
*, int, struct blk_queue_tag
*, int);
1318 extern void blk_queue_free_tags(struct request_queue
*);
1319 extern int blk_queue_resize_tags(struct request_queue
*, int);
1320 extern void blk_queue_invalidate_tags(struct request_queue
*);
1321 extern struct blk_queue_tag
*blk_init_tags(int, int);
1322 extern void blk_free_tags(struct blk_queue_tag
*);
1324 static inline struct request
*blk_map_queue_find_tag(struct blk_queue_tag
*bqt
,
1327 if (unlikely(bqt
== NULL
|| tag
>= bqt
->real_max_depth
))
1329 return bqt
->tag_index
[tag
];
1333 #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */
1334 #define BLKDEV_DISCARD_ZERO (1 << 1) /* must reliably zero data */
1336 extern int blkdev_issue_flush(struct block_device
*, gfp_t
, sector_t
*);
1337 extern int blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1338 sector_t nr_sects
, gfp_t gfp_mask
, unsigned long flags
);
1339 extern int __blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1340 sector_t nr_sects
, gfp_t gfp_mask
, int flags
,
1342 extern int blkdev_issue_write_same(struct block_device
*bdev
, sector_t sector
,
1343 sector_t nr_sects
, gfp_t gfp_mask
, struct page
*page
);
1344 extern int __blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1345 sector_t nr_sects
, gfp_t gfp_mask
, struct bio
**biop
,
1347 extern int blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1348 sector_t nr_sects
, gfp_t gfp_mask
, bool discard
);
1349 static inline int sb_issue_discard(struct super_block
*sb
, sector_t block
,
1350 sector_t nr_blocks
, gfp_t gfp_mask
, unsigned long flags
)
1352 return blkdev_issue_discard(sb
->s_bdev
, block
<< (sb
->s_blocksize_bits
- 9),
1353 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1356 static inline int sb_issue_zeroout(struct super_block
*sb
, sector_t block
,
1357 sector_t nr_blocks
, gfp_t gfp_mask
)
1359 return blkdev_issue_zeroout(sb
->s_bdev
,
1360 block
<< (sb
->s_blocksize_bits
- 9),
1361 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1365 extern int blk_verify_command(unsigned char *cmd
, fmode_t has_write_perm
);
1367 enum blk_default_limits
{
1368 BLK_MAX_SEGMENTS
= 128,
1369 BLK_SAFE_MAX_SECTORS
= 255,
1370 BLK_DEF_MAX_SECTORS
= 2560,
1371 BLK_MAX_SEGMENT_SIZE
= 65536,
1372 BLK_SEG_BOUNDARY_MASK
= 0xFFFFFFFFUL
,
1375 #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
1377 static inline unsigned long queue_bounce_pfn(struct request_queue
*q
)
1379 return q
->limits
.bounce_pfn
;
1382 static inline unsigned long queue_segment_boundary(struct request_queue
*q
)
1384 return q
->limits
.seg_boundary_mask
;
1387 static inline unsigned long queue_virt_boundary(struct request_queue
*q
)
1389 return q
->limits
.virt_boundary_mask
;
1392 static inline unsigned int queue_max_sectors(struct request_queue
*q
)
1394 return q
->limits
.max_sectors
;
1397 static inline unsigned int queue_max_hw_sectors(struct request_queue
*q
)
1399 return q
->limits
.max_hw_sectors
;
1402 static inline unsigned short queue_max_segments(struct request_queue
*q
)
1404 return q
->limits
.max_segments
;
1407 static inline unsigned short queue_max_discard_segments(struct request_queue
*q
)
1409 return q
->limits
.max_discard_segments
;
1412 static inline unsigned int queue_max_segment_size(struct request_queue
*q
)
1414 return q
->limits
.max_segment_size
;
1417 static inline unsigned short queue_logical_block_size(struct request_queue
*q
)
1421 if (q
&& q
->limits
.logical_block_size
)
1422 retval
= q
->limits
.logical_block_size
;
1427 static inline unsigned short bdev_logical_block_size(struct block_device
*bdev
)
1429 return queue_logical_block_size(bdev_get_queue(bdev
));
1432 static inline unsigned int queue_physical_block_size(struct request_queue
*q
)
1434 return q
->limits
.physical_block_size
;
1437 static inline unsigned int bdev_physical_block_size(struct block_device
*bdev
)
1439 return queue_physical_block_size(bdev_get_queue(bdev
));
1442 static inline unsigned int queue_io_min(struct request_queue
*q
)
1444 return q
->limits
.io_min
;
1447 static inline int bdev_io_min(struct block_device
*bdev
)
1449 return queue_io_min(bdev_get_queue(bdev
));
1452 static inline unsigned int queue_io_opt(struct request_queue
*q
)
1454 return q
->limits
.io_opt
;
1457 static inline int bdev_io_opt(struct block_device
*bdev
)
1459 return queue_io_opt(bdev_get_queue(bdev
));
1462 static inline int queue_alignment_offset(struct request_queue
*q
)
1464 if (q
->limits
.misaligned
)
1467 return q
->limits
.alignment_offset
;
1470 static inline int queue_limit_alignment_offset(struct queue_limits
*lim
, sector_t sector
)
1472 unsigned int granularity
= max(lim
->physical_block_size
, lim
->io_min
);
1473 unsigned int alignment
= sector_div(sector
, granularity
>> 9) << 9;
1475 return (granularity
+ lim
->alignment_offset
- alignment
) % granularity
;
1478 static inline int bdev_alignment_offset(struct block_device
*bdev
)
1480 struct request_queue
*q
= bdev_get_queue(bdev
);
1482 if (q
->limits
.misaligned
)
1485 if (bdev
!= bdev
->bd_contains
)
1486 return bdev
->bd_part
->alignment_offset
;
1488 return q
->limits
.alignment_offset
;
1491 static inline int queue_discard_alignment(struct request_queue
*q
)
1493 if (q
->limits
.discard_misaligned
)
1496 return q
->limits
.discard_alignment
;
1499 static inline int queue_limit_discard_alignment(struct queue_limits
*lim
, sector_t sector
)
1501 unsigned int alignment
, granularity
, offset
;
1503 if (!lim
->max_discard_sectors
)
1506 /* Why are these in bytes, not sectors? */
1507 alignment
= lim
->discard_alignment
>> 9;
1508 granularity
= lim
->discard_granularity
>> 9;
1512 /* Offset of the partition start in 'granularity' sectors */
1513 offset
= sector_div(sector
, granularity
);
1515 /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1516 offset
= (granularity
+ alignment
- offset
) % granularity
;
1518 /* Turn it back into bytes, gaah */
1522 static inline int bdev_discard_alignment(struct block_device
*bdev
)
1524 struct request_queue
*q
= bdev_get_queue(bdev
);
1526 if (bdev
!= bdev
->bd_contains
)
1527 return bdev
->bd_part
->discard_alignment
;
1529 return q
->limits
.discard_alignment
;
1532 static inline unsigned int queue_discard_zeroes_data(struct request_queue
*q
)
1534 if (q
->limits
.max_discard_sectors
&& q
->limits
.discard_zeroes_data
== 1)
1540 static inline unsigned int bdev_discard_zeroes_data(struct block_device
*bdev
)
1542 return queue_discard_zeroes_data(bdev_get_queue(bdev
));
1545 static inline unsigned int bdev_write_same(struct block_device
*bdev
)
1547 struct request_queue
*q
= bdev_get_queue(bdev
);
1550 return q
->limits
.max_write_same_sectors
;
1555 static inline unsigned int bdev_write_zeroes_sectors(struct block_device
*bdev
)
1557 struct request_queue
*q
= bdev_get_queue(bdev
);
1560 return q
->limits
.max_write_zeroes_sectors
;
1565 static inline enum blk_zoned_model
bdev_zoned_model(struct block_device
*bdev
)
1567 struct request_queue
*q
= bdev_get_queue(bdev
);
1570 return blk_queue_zoned_model(q
);
1572 return BLK_ZONED_NONE
;
1575 static inline bool bdev_is_zoned(struct block_device
*bdev
)
1577 struct request_queue
*q
= bdev_get_queue(bdev
);
1580 return blk_queue_is_zoned(q
);
1585 static inline unsigned int bdev_zone_sectors(struct block_device
*bdev
)
1587 struct request_queue
*q
= bdev_get_queue(bdev
);
1590 return blk_queue_zone_sectors(q
);
1595 static inline int queue_dma_alignment(struct request_queue
*q
)
1597 return q
? q
->dma_alignment
: 511;
1600 static inline int blk_rq_aligned(struct request_queue
*q
, unsigned long addr
,
1603 unsigned int alignment
= queue_dma_alignment(q
) | q
->dma_pad_mask
;
1604 return !(addr
& alignment
) && !(len
& alignment
);
1607 /* assumes size > 256 */
1608 static inline unsigned int blksize_bits(unsigned int size
)
1610 unsigned int bits
= 8;
1614 } while (size
> 256);
1618 static inline unsigned int block_size(struct block_device
*bdev
)
1620 return bdev
->bd_block_size
;
1623 static inline bool queue_flush_queueable(struct request_queue
*q
)
1625 return !test_bit(QUEUE_FLAG_FLUSH_NQ
, &q
->queue_flags
);
1628 typedef struct {struct page
*v
;} Sector
;
1630 unsigned char *read_dev_sector(struct block_device
*, sector_t
, Sector
*);
1632 static inline void put_dev_sector(Sector p
)
1637 static inline bool __bvec_gap_to_prev(struct request_queue
*q
,
1638 struct bio_vec
*bprv
, unsigned int offset
)
1641 ((bprv
->bv_offset
+ bprv
->bv_len
) & queue_virt_boundary(q
));
1645 * Check if adding a bio_vec after bprv with offset would create a gap in
1646 * the SG list. Most drivers don't care about this, but some do.
1648 static inline bool bvec_gap_to_prev(struct request_queue
*q
,
1649 struct bio_vec
*bprv
, unsigned int offset
)
1651 if (!queue_virt_boundary(q
))
1653 return __bvec_gap_to_prev(q
, bprv
, offset
);
1657 * Check if the two bvecs from two bios can be merged to one segment.
1658 * If yes, no need to check gap between the two bios since the 1st bio
1659 * and the 1st bvec in the 2nd bio can be handled in one segment.
1661 static inline bool bios_segs_mergeable(struct request_queue
*q
,
1662 struct bio
*prev
, struct bio_vec
*prev_last_bv
,
1663 struct bio_vec
*next_first_bv
)
1665 if (!BIOVEC_PHYS_MERGEABLE(prev_last_bv
, next_first_bv
))
1667 if (!BIOVEC_SEG_BOUNDARY(q
, prev_last_bv
, next_first_bv
))
1669 if (prev
->bi_seg_back_size
+ next_first_bv
->bv_len
>
1670 queue_max_segment_size(q
))
1675 static inline bool bio_will_gap(struct request_queue
*q
, struct bio
*prev
,
1678 if (bio_has_data(prev
) && queue_virt_boundary(q
)) {
1679 struct bio_vec pb
, nb
;
1681 bio_get_last_bvec(prev
, &pb
);
1682 bio_get_first_bvec(next
, &nb
);
1684 if (!bios_segs_mergeable(q
, prev
, &pb
, &nb
))
1685 return __bvec_gap_to_prev(q
, &pb
, nb
.bv_offset
);
1691 static inline bool req_gap_back_merge(struct request
*req
, struct bio
*bio
)
1693 return bio_will_gap(req
->q
, req
->biotail
, bio
);
1696 static inline bool req_gap_front_merge(struct request
*req
, struct bio
*bio
)
1698 return bio_will_gap(req
->q
, bio
, req
->bio
);
1701 int kblockd_schedule_work(struct work_struct
*work
);
1702 int kblockd_schedule_work_on(int cpu
, struct work_struct
*work
);
1703 int kblockd_schedule_delayed_work(struct delayed_work
*dwork
, unsigned long delay
);
1704 int kblockd_schedule_delayed_work_on(int cpu
, struct delayed_work
*dwork
, unsigned long delay
);
1706 #ifdef CONFIG_BLK_CGROUP
1708 * This should not be using sched_clock(). A real patch is in progress
1709 * to fix this up, until that is in place we need to disable preemption
1710 * around sched_clock() in this function and set_io_start_time_ns().
1712 static inline void set_start_time_ns(struct request
*req
)
1715 req
->start_time_ns
= sched_clock();
1719 static inline void set_io_start_time_ns(struct request
*req
)
1722 req
->io_start_time_ns
= sched_clock();
1726 static inline uint64_t rq_start_time_ns(struct request
*req
)
1728 return req
->start_time_ns
;
1731 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1733 return req
->io_start_time_ns
;
1736 static inline void set_start_time_ns(struct request
*req
) {}
1737 static inline void set_io_start_time_ns(struct request
*req
) {}
1738 static inline uint64_t rq_start_time_ns(struct request
*req
)
1742 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1748 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1749 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1750 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1751 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1753 #if defined(CONFIG_BLK_DEV_INTEGRITY)
1755 enum blk_integrity_flags
{
1756 BLK_INTEGRITY_VERIFY
= 1 << 0,
1757 BLK_INTEGRITY_GENERATE
= 1 << 1,
1758 BLK_INTEGRITY_DEVICE_CAPABLE
= 1 << 2,
1759 BLK_INTEGRITY_IP_CHECKSUM
= 1 << 3,
1762 struct blk_integrity_iter
{
1766 unsigned int data_size
;
1767 unsigned short interval
;
1768 const char *disk_name
;
1771 typedef int (integrity_processing_fn
) (struct blk_integrity_iter
*);
1773 struct blk_integrity_profile
{
1774 integrity_processing_fn
*generate_fn
;
1775 integrity_processing_fn
*verify_fn
;
1779 extern void blk_integrity_register(struct gendisk
*, struct blk_integrity
*);
1780 extern void blk_integrity_unregister(struct gendisk
*);
1781 extern int blk_integrity_compare(struct gendisk
*, struct gendisk
*);
1782 extern int blk_rq_map_integrity_sg(struct request_queue
*, struct bio
*,
1783 struct scatterlist
*);
1784 extern int blk_rq_count_integrity_sg(struct request_queue
*, struct bio
*);
1785 extern bool blk_integrity_merge_rq(struct request_queue
*, struct request
*,
1787 extern bool blk_integrity_merge_bio(struct request_queue
*, struct request
*,
1790 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1792 struct blk_integrity
*bi
= &disk
->queue
->integrity
;
1801 struct blk_integrity
*bdev_get_integrity(struct block_device
*bdev
)
1803 return blk_get_integrity(bdev
->bd_disk
);
1806 static inline bool blk_integrity_rq(struct request
*rq
)
1808 return rq
->cmd_flags
& REQ_INTEGRITY
;
1811 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1814 q
->limits
.max_integrity_segments
= segs
;
1817 static inline unsigned short
1818 queue_max_integrity_segments(struct request_queue
*q
)
1820 return q
->limits
.max_integrity_segments
;
1823 static inline bool integrity_req_gap_back_merge(struct request
*req
,
1826 struct bio_integrity_payload
*bip
= bio_integrity(req
->bio
);
1827 struct bio_integrity_payload
*bip_next
= bio_integrity(next
);
1829 return bvec_gap_to_prev(req
->q
, &bip
->bip_vec
[bip
->bip_vcnt
- 1],
1830 bip_next
->bip_vec
[0].bv_offset
);
1833 static inline bool integrity_req_gap_front_merge(struct request
*req
,
1836 struct bio_integrity_payload
*bip
= bio_integrity(bio
);
1837 struct bio_integrity_payload
*bip_next
= bio_integrity(req
->bio
);
1839 return bvec_gap_to_prev(req
->q
, &bip
->bip_vec
[bip
->bip_vcnt
- 1],
1840 bip_next
->bip_vec
[0].bv_offset
);
1843 #else /* CONFIG_BLK_DEV_INTEGRITY */
1846 struct block_device
;
1848 struct blk_integrity
;
1850 static inline int blk_integrity_rq(struct request
*rq
)
1854 static inline int blk_rq_count_integrity_sg(struct request_queue
*q
,
1859 static inline int blk_rq_map_integrity_sg(struct request_queue
*q
,
1861 struct scatterlist
*s
)
1865 static inline struct blk_integrity
*bdev_get_integrity(struct block_device
*b
)
1869 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1873 static inline int blk_integrity_compare(struct gendisk
*a
, struct gendisk
*b
)
1877 static inline void blk_integrity_register(struct gendisk
*d
,
1878 struct blk_integrity
*b
)
1881 static inline void blk_integrity_unregister(struct gendisk
*d
)
1884 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1888 static inline unsigned short queue_max_integrity_segments(struct request_queue
*q
)
1892 static inline bool blk_integrity_merge_rq(struct request_queue
*rq
,
1898 static inline bool blk_integrity_merge_bio(struct request_queue
*rq
,
1905 static inline bool integrity_req_gap_back_merge(struct request
*req
,
1910 static inline bool integrity_req_gap_front_merge(struct request
*req
,
1916 #endif /* CONFIG_BLK_DEV_INTEGRITY */
1919 * struct blk_dax_ctl - control and output parameters for ->direct_access
1920 * @sector: (input) offset relative to a block_device
1921 * @addr: (output) kernel virtual address for @sector populated by driver
1922 * @pfn: (output) page frame number for @addr populated by driver
1923 * @size: (input) number of bytes requested
1925 struct blk_dax_ctl
{
1932 struct block_device_operations
{
1933 int (*open
) (struct block_device
*, fmode_t
);
1934 void (*release
) (struct gendisk
*, fmode_t
);
1935 int (*rw_page
)(struct block_device
*, sector_t
, struct page
*, bool);
1936 int (*ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1937 int (*compat_ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1938 long (*direct_access
)(struct block_device
*, sector_t
, void **, pfn_t
*,
1940 unsigned int (*check_events
) (struct gendisk
*disk
,
1941 unsigned int clearing
);
1942 /* ->media_changed() is DEPRECATED, use ->check_events() instead */
1943 int (*media_changed
) (struct gendisk
*);
1944 void (*unlock_native_capacity
) (struct gendisk
*);
1945 int (*revalidate_disk
) (struct gendisk
*);
1946 int (*getgeo
)(struct block_device
*, struct hd_geometry
*);
1947 /* this callback is with swap_lock and sometimes page table lock held */
1948 void (*swap_slot_free_notify
) (struct block_device
*, unsigned long);
1949 struct module
*owner
;
1950 const struct pr_ops
*pr_ops
;
1953 extern int __blkdev_driver_ioctl(struct block_device
*, fmode_t
, unsigned int,
1955 extern int bdev_read_page(struct block_device
*, sector_t
, struct page
*);
1956 extern int bdev_write_page(struct block_device
*, sector_t
, struct page
*,
1957 struct writeback_control
*);
1958 extern long bdev_direct_access(struct block_device
*, struct blk_dax_ctl
*);
1959 extern int bdev_dax_supported(struct super_block
*, int);
1960 extern bool bdev_dax_capable(struct block_device
*);
1961 #else /* CONFIG_BLOCK */
1963 struct block_device
;
1966 * stubs for when the block layer is configured out
1968 #define buffer_heads_over_limit 0
1970 static inline long nr_blockdev_pages(void)
1978 static inline void blk_start_plug(struct blk_plug
*plug
)
1982 static inline void blk_finish_plug(struct blk_plug
*plug
)
1986 static inline void blk_flush_plug(struct task_struct
*task
)
1990 static inline void blk_schedule_flush_plug(struct task_struct
*task
)
1995 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
2000 static inline int blkdev_issue_flush(struct block_device
*bdev
, gfp_t gfp_mask
,
2001 sector_t
*error_sector
)
2006 #endif /* CONFIG_BLOCK */