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
;
335 unsigned char misaligned
;
336 unsigned char discard_misaligned
;
337 unsigned char cluster
;
338 unsigned char discard_zeroes_data
;
339 unsigned char raid_partial_stripes_expensive
;
340 enum blk_zoned_model zoned
;
343 #ifdef CONFIG_BLK_DEV_ZONED
345 struct blk_zone_report_hdr
{
346 unsigned int nr_zones
;
350 extern int blkdev_report_zones(struct block_device
*bdev
,
351 sector_t sector
, struct blk_zone
*zones
,
352 unsigned int *nr_zones
, gfp_t gfp_mask
);
353 extern int blkdev_reset_zones(struct block_device
*bdev
, sector_t sectors
,
354 sector_t nr_sectors
, gfp_t gfp_mask
);
356 extern int blkdev_report_zones_ioctl(struct block_device
*bdev
, fmode_t mode
,
357 unsigned int cmd
, unsigned long arg
);
358 extern int blkdev_reset_zones_ioctl(struct block_device
*bdev
, fmode_t mode
,
359 unsigned int cmd
, unsigned long arg
);
361 #else /* CONFIG_BLK_DEV_ZONED */
363 static inline int blkdev_report_zones_ioctl(struct block_device
*bdev
,
364 fmode_t mode
, unsigned int cmd
,
370 static inline int blkdev_reset_zones_ioctl(struct block_device
*bdev
,
371 fmode_t mode
, unsigned int cmd
,
377 #endif /* CONFIG_BLK_DEV_ZONED */
379 struct request_queue
{
381 * Together with queue_head for cacheline sharing
383 struct list_head queue_head
;
384 struct request
*last_merge
;
385 struct elevator_queue
*elevator
;
386 int nr_rqs
[2]; /* # allocated [a]sync rqs */
387 int nr_rqs_elvpriv
; /* # allocated rqs w/ elvpriv */
392 * If blkcg is not used, @q->root_rl serves all requests. If blkcg
393 * is used, root blkg allocates from @q->root_rl and all other
394 * blkgs from their own blkg->rl. Which one to use should be
395 * determined using bio_request_list().
397 struct request_list root_rl
;
399 request_fn_proc
*request_fn
;
400 make_request_fn
*make_request_fn
;
401 prep_rq_fn
*prep_rq_fn
;
402 unprep_rq_fn
*unprep_rq_fn
;
403 softirq_done_fn
*softirq_done_fn
;
404 rq_timed_out_fn
*rq_timed_out_fn
;
405 dma_drain_needed_fn
*dma_drain_needed
;
406 lld_busy_fn
*lld_busy_fn
;
407 init_rq_fn
*init_rq_fn
;
408 exit_rq_fn
*exit_rq_fn
;
410 const struct blk_mq_ops
*mq_ops
;
412 unsigned int *mq_map
;
415 struct blk_mq_ctx __percpu
*queue_ctx
;
416 unsigned int nr_queues
;
418 unsigned int queue_depth
;
420 /* hw dispatch queues */
421 struct blk_mq_hw_ctx
**queue_hw_ctx
;
422 unsigned int nr_hw_queues
;
425 * Dispatch queue sorting
428 struct request
*boundary_rq
;
431 * Delayed queue handling
433 struct delayed_work delay_work
;
435 struct backing_dev_info
*backing_dev_info
;
438 * The queue owner gets to use this for whatever they like.
439 * ll_rw_blk doesn't touch it.
444 * various queue flags, see QUEUE_* below
446 unsigned long queue_flags
;
449 * ida allocated id for this queue. Used to index queues from
455 * queue needs bounce pages for pages above this limit
460 * protects queue structures from reentrancy. ->__queue_lock should
461 * _never_ be used directly, it is queue private. always use
464 spinlock_t __queue_lock
;
465 spinlock_t
*queue_lock
;
475 struct kobject mq_kobj
;
477 #ifdef CONFIG_BLK_DEV_INTEGRITY
478 struct blk_integrity integrity
;
479 #endif /* CONFIG_BLK_DEV_INTEGRITY */
484 unsigned int nr_pending
;
490 unsigned long nr_requests
; /* Max # of requests */
491 unsigned int nr_congestion_on
;
492 unsigned int nr_congestion_off
;
493 unsigned int nr_batching
;
495 unsigned int dma_drain_size
;
496 void *dma_drain_buffer
;
497 unsigned int dma_pad_mask
;
498 unsigned int dma_alignment
;
500 struct blk_queue_tag
*queue_tags
;
501 struct list_head tag_busy_list
;
503 unsigned int nr_sorted
;
504 unsigned int in_flight
[2];
506 struct blk_rq_stat rq_stats
[2];
509 * Number of active block driver functions for which blk_drain_queue()
510 * must wait. Must be incremented around functions that unlock the
511 * queue_lock internally, e.g. scsi_request_fn().
513 unsigned int request_fn_active
;
515 unsigned int rq_timeout
;
517 struct timer_list timeout
;
518 struct work_struct timeout_work
;
519 struct list_head timeout_list
;
521 struct list_head icq_list
;
522 #ifdef CONFIG_BLK_CGROUP
523 DECLARE_BITMAP (blkcg_pols
, BLKCG_MAX_POLS
);
524 struct blkcg_gq
*root_blkg
;
525 struct list_head blkg_list
;
528 struct queue_limits limits
;
533 unsigned int sg_timeout
;
534 unsigned int sg_reserved_size
;
536 #ifdef CONFIG_BLK_DEV_IO_TRACE
537 struct blk_trace
*blk_trace
;
540 * for flush operations
542 struct blk_flush_queue
*fq
;
544 struct list_head requeue_list
;
545 spinlock_t requeue_lock
;
546 struct delayed_work requeue_work
;
548 struct mutex sysfs_lock
;
551 atomic_t mq_freeze_depth
;
553 #if defined(CONFIG_BLK_DEV_BSG)
554 bsg_job_fn
*bsg_job_fn
;
556 struct bsg_class_device bsg_dev
;
559 #ifdef CONFIG_BLK_DEV_THROTTLING
561 struct throtl_data
*td
;
563 struct rcu_head rcu_head
;
564 wait_queue_head_t mq_freeze_wq
;
565 struct percpu_ref q_usage_counter
;
566 struct list_head all_q_node
;
568 struct blk_mq_tag_set
*tag_set
;
569 struct list_head tag_set_list
;
570 struct bio_set
*bio_split
;
572 #ifdef CONFIG_DEBUG_FS
573 struct dentry
*debugfs_dir
;
574 struct dentry
*mq_debugfs_dir
;
577 bool mq_sysfs_init_done
;
583 #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */
584 #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */
585 #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */
586 #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */
587 #define QUEUE_FLAG_DYING 5 /* queue being torn down */
588 #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */
589 #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */
590 #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */
591 #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */
592 #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */
593 #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */
594 #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */
595 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
596 #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */
597 #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */
598 #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */
599 #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */
600 #define QUEUE_FLAG_SECERASE 17 /* supports secure erase */
601 #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */
602 #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */
603 #define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */
604 #define QUEUE_FLAG_NO_SG_MERGE 21 /* don't attempt to merge SG segments*/
605 #define QUEUE_FLAG_POLL 22 /* IO polling enabled if set */
606 #define QUEUE_FLAG_WC 23 /* Write back caching */
607 #define QUEUE_FLAG_FUA 24 /* device supports FUA writes */
608 #define QUEUE_FLAG_FLUSH_NQ 25 /* flush not queueuable */
609 #define QUEUE_FLAG_DAX 26 /* device supports DAX */
610 #define QUEUE_FLAG_STATS 27 /* track rq completion times */
611 #define QUEUE_FLAG_RESTART 28 /* queue needs restart at completion */
613 #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
614 (1 << QUEUE_FLAG_STACKABLE) | \
615 (1 << QUEUE_FLAG_SAME_COMP) | \
616 (1 << QUEUE_FLAG_ADD_RANDOM))
618 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
619 (1 << QUEUE_FLAG_STACKABLE) | \
620 (1 << QUEUE_FLAG_SAME_COMP) | \
621 (1 << QUEUE_FLAG_POLL))
623 static inline void queue_lockdep_assert_held(struct request_queue
*q
)
626 lockdep_assert_held(q
->queue_lock
);
629 static inline void queue_flag_set_unlocked(unsigned int flag
,
630 struct request_queue
*q
)
632 __set_bit(flag
, &q
->queue_flags
);
635 static inline int queue_flag_test_and_clear(unsigned int flag
,
636 struct request_queue
*q
)
638 queue_lockdep_assert_held(q
);
640 if (test_bit(flag
, &q
->queue_flags
)) {
641 __clear_bit(flag
, &q
->queue_flags
);
648 static inline int queue_flag_test_and_set(unsigned int flag
,
649 struct request_queue
*q
)
651 queue_lockdep_assert_held(q
);
653 if (!test_bit(flag
, &q
->queue_flags
)) {
654 __set_bit(flag
, &q
->queue_flags
);
661 static inline void queue_flag_set(unsigned int flag
, struct request_queue
*q
)
663 queue_lockdep_assert_held(q
);
664 __set_bit(flag
, &q
->queue_flags
);
667 static inline void queue_flag_clear_unlocked(unsigned int flag
,
668 struct request_queue
*q
)
670 __clear_bit(flag
, &q
->queue_flags
);
673 static inline int queue_in_flight(struct request_queue
*q
)
675 return q
->in_flight
[0] + q
->in_flight
[1];
678 static inline void queue_flag_clear(unsigned int flag
, struct request_queue
*q
)
680 queue_lockdep_assert_held(q
);
681 __clear_bit(flag
, &q
->queue_flags
);
684 #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
685 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
686 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
687 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
688 #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags)
689 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
690 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
691 #define blk_queue_noxmerges(q) \
692 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
693 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
694 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
695 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
696 #define blk_queue_stackable(q) \
697 test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
698 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
699 #define blk_queue_secure_erase(q) \
700 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
701 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
703 #define blk_noretry_request(rq) \
704 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
705 REQ_FAILFAST_DRIVER))
707 static inline bool blk_account_rq(struct request
*rq
)
709 return (rq
->rq_flags
& RQF_STARTED
) && !blk_rq_is_passthrough(rq
);
712 #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
713 #define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
714 /* rq->queuelist of dequeued request must be list_empty() */
715 #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
717 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
719 #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ)
722 * Driver can handle struct request, if it either has an old style
723 * request_fn defined, or is blk-mq based.
725 static inline bool queue_is_rq_based(struct request_queue
*q
)
727 return q
->request_fn
|| q
->mq_ops
;
730 static inline unsigned int blk_queue_cluster(struct request_queue
*q
)
732 return q
->limits
.cluster
;
735 static inline enum blk_zoned_model
736 blk_queue_zoned_model(struct request_queue
*q
)
738 return q
->limits
.zoned
;
741 static inline bool blk_queue_is_zoned(struct request_queue
*q
)
743 switch (blk_queue_zoned_model(q
)) {
752 static inline unsigned int blk_queue_zone_sectors(struct request_queue
*q
)
754 return blk_queue_is_zoned(q
) ? q
->limits
.chunk_sectors
: 0;
757 static inline bool rq_is_sync(struct request
*rq
)
759 return op_is_sync(rq
->cmd_flags
);
762 static inline bool blk_rl_full(struct request_list
*rl
, bool sync
)
764 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
766 return rl
->flags
& flag
;
769 static inline void blk_set_rl_full(struct request_list
*rl
, bool sync
)
771 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
776 static inline void blk_clear_rl_full(struct request_list
*rl
, bool sync
)
778 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
783 static inline bool rq_mergeable(struct request
*rq
)
785 if (blk_rq_is_passthrough(rq
))
788 if (req_op(rq
) == REQ_OP_FLUSH
)
791 if (req_op(rq
) == REQ_OP_WRITE_ZEROES
)
794 if (rq
->cmd_flags
& REQ_NOMERGE_FLAGS
)
796 if (rq
->rq_flags
& RQF_NOMERGE_FLAGS
)
802 static inline bool blk_write_same_mergeable(struct bio
*a
, struct bio
*b
)
804 if (bio_data(a
) == bio_data(b
))
810 static inline unsigned int blk_queue_depth(struct request_queue
*q
)
813 return q
->queue_depth
;
815 return q
->nr_requests
;
819 * q->prep_rq_fn return values
822 BLKPREP_OK
, /* serve it */
823 BLKPREP_KILL
, /* fatal error, kill, return -EIO */
824 BLKPREP_DEFER
, /* leave on queue */
825 BLKPREP_INVALID
, /* invalid command, kill, return -EREMOTEIO */
828 extern unsigned long blk_max_low_pfn
, blk_max_pfn
;
831 * standard bounce addresses:
833 * BLK_BOUNCE_HIGH : bounce all highmem pages
834 * BLK_BOUNCE_ANY : don't bounce anything
835 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
838 #if BITS_PER_LONG == 32
839 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
841 #define BLK_BOUNCE_HIGH -1ULL
843 #define BLK_BOUNCE_ANY (-1ULL)
844 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
847 * default timeout for SG_IO if none specified
849 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
850 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
853 extern int init_emergency_isa_pool(void);
854 extern void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
);
856 static inline int init_emergency_isa_pool(void)
860 static inline void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
)
863 #endif /* CONFIG_MMU */
869 unsigned long offset
;
874 struct req_iterator
{
875 struct bvec_iter iter
;
879 /* This should not be used directly - use rq_for_each_segment */
880 #define for_each_bio(_bio) \
881 for (; _bio; _bio = _bio->bi_next)
882 #define __rq_for_each_bio(_bio, rq) \
884 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
886 #define rq_for_each_segment(bvl, _rq, _iter) \
887 __rq_for_each_bio(_iter.bio, _rq) \
888 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
890 #define rq_iter_last(bvec, _iter) \
891 (_iter.bio->bi_next == NULL && \
892 bio_iter_last(bvec, _iter.iter))
894 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
895 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
897 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
898 extern void rq_flush_dcache_pages(struct request
*rq
);
900 static inline void rq_flush_dcache_pages(struct request
*rq
)
906 #define vfs_msg(sb, level, fmt, ...) \
907 __vfs_msg(sb, level, fmt, ##__VA_ARGS__)
909 #define vfs_msg(sb, level, fmt, ...) \
911 no_printk(fmt, ##__VA_ARGS__); \
912 __vfs_msg(sb, "", " "); \
916 extern int blk_register_queue(struct gendisk
*disk
);
917 extern void blk_unregister_queue(struct gendisk
*disk
);
918 extern blk_qc_t
generic_make_request(struct bio
*bio
);
919 extern void blk_rq_init(struct request_queue
*q
, struct request
*rq
);
920 extern void blk_put_request(struct request
*);
921 extern void __blk_put_request(struct request_queue
*, struct request
*);
922 extern struct request
*blk_get_request(struct request_queue
*, int, gfp_t
);
923 extern void blk_requeue_request(struct request_queue
*, struct request
*);
924 extern int blk_lld_busy(struct request_queue
*q
);
925 extern int blk_rq_prep_clone(struct request
*rq
, struct request
*rq_src
,
926 struct bio_set
*bs
, gfp_t gfp_mask
,
927 int (*bio_ctr
)(struct bio
*, struct bio
*, void *),
929 extern void blk_rq_unprep_clone(struct request
*rq
);
930 extern int blk_insert_cloned_request(struct request_queue
*q
,
932 extern int blk_rq_append_bio(struct request
*rq
, struct bio
*bio
);
933 extern void blk_delay_queue(struct request_queue
*, unsigned long);
934 extern void blk_queue_split(struct request_queue
*, struct bio
**,
936 extern void blk_recount_segments(struct request_queue
*, struct bio
*);
937 extern int scsi_verify_blk_ioctl(struct block_device
*, unsigned int);
938 extern int scsi_cmd_blk_ioctl(struct block_device
*, fmode_t
,
939 unsigned int, void __user
*);
940 extern int scsi_cmd_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
941 unsigned int, void __user
*);
942 extern int sg_scsi_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
943 struct scsi_ioctl_command __user
*);
945 extern int blk_queue_enter(struct request_queue
*q
, bool nowait
);
946 extern void blk_queue_exit(struct request_queue
*q
);
947 extern void blk_start_queue(struct request_queue
*q
);
948 extern void blk_start_queue_async(struct request_queue
*q
);
949 extern void blk_stop_queue(struct request_queue
*q
);
950 extern void blk_sync_queue(struct request_queue
*q
);
951 extern void __blk_stop_queue(struct request_queue
*q
);
952 extern void __blk_run_queue(struct request_queue
*q
);
953 extern void __blk_run_queue_uncond(struct request_queue
*q
);
954 extern void blk_run_queue(struct request_queue
*);
955 extern void blk_run_queue_async(struct request_queue
*q
);
956 extern void blk_mq_quiesce_queue(struct request_queue
*q
);
957 extern int blk_rq_map_user(struct request_queue
*, struct request
*,
958 struct rq_map_data
*, void __user
*, unsigned long,
960 extern int blk_rq_unmap_user(struct bio
*);
961 extern int blk_rq_map_kern(struct request_queue
*, struct request
*, void *, unsigned int, gfp_t
);
962 extern int blk_rq_map_user_iov(struct request_queue
*, struct request
*,
963 struct rq_map_data
*, const struct iov_iter
*,
965 extern int blk_execute_rq(struct request_queue
*, struct gendisk
*,
966 struct request
*, int);
967 extern void blk_execute_rq_nowait(struct request_queue
*, struct gendisk
*,
968 struct request
*, int, rq_end_io_fn
*);
970 bool blk_mq_poll(struct request_queue
*q
, blk_qc_t cookie
);
972 static inline struct request_queue
*bdev_get_queue(struct block_device
*bdev
)
974 return bdev
->bd_disk
->queue
; /* this is never NULL */
978 * blk_rq_pos() : the current sector
979 * blk_rq_bytes() : bytes left in the entire request
980 * blk_rq_cur_bytes() : bytes left in the current segment
981 * blk_rq_err_bytes() : bytes left till the next error boundary
982 * blk_rq_sectors() : sectors left in the entire request
983 * blk_rq_cur_sectors() : sectors left in the current segment
985 static inline sector_t
blk_rq_pos(const struct request
*rq
)
990 static inline unsigned int blk_rq_bytes(const struct request
*rq
)
992 return rq
->__data_len
;
995 static inline int blk_rq_cur_bytes(const struct request
*rq
)
997 return rq
->bio
? bio_cur_bytes(rq
->bio
) : 0;
1000 extern unsigned int blk_rq_err_bytes(const struct request
*rq
);
1002 static inline unsigned int blk_rq_sectors(const struct request
*rq
)
1004 return blk_rq_bytes(rq
) >> 9;
1007 static inline unsigned int blk_rq_cur_sectors(const struct request
*rq
)
1009 return blk_rq_cur_bytes(rq
) >> 9;
1013 * Some commands like WRITE SAME have a payload or data transfer size which
1014 * is different from the size of the request. Any driver that supports such
1015 * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to
1016 * calculate the data transfer size.
1018 static inline unsigned int blk_rq_payload_bytes(struct request
*rq
)
1020 if (rq
->rq_flags
& RQF_SPECIAL_PAYLOAD
)
1021 return rq
->special_vec
.bv_len
;
1022 return blk_rq_bytes(rq
);
1025 static inline unsigned int blk_queue_get_max_sectors(struct request_queue
*q
,
1028 if (unlikely(op
== REQ_OP_DISCARD
|| op
== REQ_OP_SECURE_ERASE
))
1029 return min(q
->limits
.max_discard_sectors
, UINT_MAX
>> 9);
1031 if (unlikely(op
== REQ_OP_WRITE_SAME
))
1032 return q
->limits
.max_write_same_sectors
;
1034 if (unlikely(op
== REQ_OP_WRITE_ZEROES
))
1035 return q
->limits
.max_write_zeroes_sectors
;
1037 return q
->limits
.max_sectors
;
1041 * Return maximum size of a request at given offset. Only valid for
1042 * file system requests.
1044 static inline unsigned int blk_max_size_offset(struct request_queue
*q
,
1047 if (!q
->limits
.chunk_sectors
)
1048 return q
->limits
.max_sectors
;
1050 return q
->limits
.chunk_sectors
-
1051 (offset
& (q
->limits
.chunk_sectors
- 1));
1054 static inline unsigned int blk_rq_get_max_sectors(struct request
*rq
,
1057 struct request_queue
*q
= rq
->q
;
1059 if (blk_rq_is_passthrough(rq
))
1060 return q
->limits
.max_hw_sectors
;
1062 if (!q
->limits
.chunk_sectors
||
1063 req_op(rq
) == REQ_OP_DISCARD
||
1064 req_op(rq
) == REQ_OP_SECURE_ERASE
)
1065 return blk_queue_get_max_sectors(q
, req_op(rq
));
1067 return min(blk_max_size_offset(q
, offset
),
1068 blk_queue_get_max_sectors(q
, req_op(rq
)));
1071 static inline unsigned int blk_rq_count_bios(struct request
*rq
)
1073 unsigned int nr_bios
= 0;
1076 __rq_for_each_bio(bio
, rq
)
1083 * blk_rq_set_prio - associate a request with prio from ioc
1084 * @rq: request of interest
1085 * @ioc: target iocontext
1087 * Assocate request prio with ioc prio so request based drivers
1088 * can leverage priority information.
1090 static inline void blk_rq_set_prio(struct request
*rq
, struct io_context
*ioc
)
1093 rq
->ioprio
= ioc
->ioprio
;
1097 * Request issue related functions.
1099 extern struct request
*blk_peek_request(struct request_queue
*q
);
1100 extern void blk_start_request(struct request
*rq
);
1101 extern struct request
*blk_fetch_request(struct request_queue
*q
);
1104 * Request completion related functions.
1106 * blk_update_request() completes given number of bytes and updates
1107 * the request without completing it.
1109 * blk_end_request() and friends. __blk_end_request() must be called
1110 * with the request queue spinlock acquired.
1112 * Several drivers define their own end_request and call
1113 * blk_end_request() for parts of the original function.
1114 * This prevents code duplication in drivers.
1116 extern bool blk_update_request(struct request
*rq
, int error
,
1117 unsigned int nr_bytes
);
1118 extern void blk_finish_request(struct request
*rq
, int error
);
1119 extern bool blk_end_request(struct request
*rq
, int error
,
1120 unsigned int nr_bytes
);
1121 extern void blk_end_request_all(struct request
*rq
, int error
);
1122 extern bool blk_end_request_cur(struct request
*rq
, int error
);
1123 extern bool blk_end_request_err(struct request
*rq
, int error
);
1124 extern bool __blk_end_request(struct request
*rq
, int error
,
1125 unsigned int nr_bytes
);
1126 extern void __blk_end_request_all(struct request
*rq
, int error
);
1127 extern bool __blk_end_request_cur(struct request
*rq
, int error
);
1128 extern bool __blk_end_request_err(struct request
*rq
, int error
);
1130 extern void blk_complete_request(struct request
*);
1131 extern void __blk_complete_request(struct request
*);
1132 extern void blk_abort_request(struct request
*);
1133 extern void blk_unprep_request(struct request
*);
1136 * Access functions for manipulating queue properties
1138 extern struct request_queue
*blk_init_queue_node(request_fn_proc
*rfn
,
1139 spinlock_t
*lock
, int node_id
);
1140 extern struct request_queue
*blk_init_queue(request_fn_proc
*, spinlock_t
*);
1141 extern int blk_init_allocated_queue(struct request_queue
*);
1142 extern void blk_cleanup_queue(struct request_queue
*);
1143 extern void blk_queue_make_request(struct request_queue
*, make_request_fn
*);
1144 extern void blk_queue_bounce_limit(struct request_queue
*, u64
);
1145 extern void blk_queue_max_hw_sectors(struct request_queue
*, unsigned int);
1146 extern void blk_queue_chunk_sectors(struct request_queue
*, unsigned int);
1147 extern void blk_queue_max_segments(struct request_queue
*, unsigned short);
1148 extern void blk_queue_max_segment_size(struct request_queue
*, unsigned int);
1149 extern void blk_queue_max_discard_sectors(struct request_queue
*q
,
1150 unsigned int max_discard_sectors
);
1151 extern void blk_queue_max_write_same_sectors(struct request_queue
*q
,
1152 unsigned int max_write_same_sectors
);
1153 extern void blk_queue_max_write_zeroes_sectors(struct request_queue
*q
,
1154 unsigned int max_write_same_sectors
);
1155 extern void blk_queue_logical_block_size(struct request_queue
*, unsigned short);
1156 extern void blk_queue_physical_block_size(struct request_queue
*, unsigned int);
1157 extern void blk_queue_alignment_offset(struct request_queue
*q
,
1158 unsigned int alignment
);
1159 extern void blk_limits_io_min(struct queue_limits
*limits
, unsigned int min
);
1160 extern void blk_queue_io_min(struct request_queue
*q
, unsigned int min
);
1161 extern void blk_limits_io_opt(struct queue_limits
*limits
, unsigned int opt
);
1162 extern void blk_queue_io_opt(struct request_queue
*q
, unsigned int opt
);
1163 extern void blk_set_queue_depth(struct request_queue
*q
, unsigned int depth
);
1164 extern void blk_set_default_limits(struct queue_limits
*lim
);
1165 extern void blk_set_stacking_limits(struct queue_limits
*lim
);
1166 extern int blk_stack_limits(struct queue_limits
*t
, struct queue_limits
*b
,
1168 extern int bdev_stack_limits(struct queue_limits
*t
, struct block_device
*bdev
,
1170 extern void disk_stack_limits(struct gendisk
*disk
, struct block_device
*bdev
,
1172 extern void blk_queue_stack_limits(struct request_queue
*t
, struct request_queue
*b
);
1173 extern void blk_queue_dma_pad(struct request_queue
*, unsigned int);
1174 extern void blk_queue_update_dma_pad(struct request_queue
*, unsigned int);
1175 extern int blk_queue_dma_drain(struct request_queue
*q
,
1176 dma_drain_needed_fn
*dma_drain_needed
,
1177 void *buf
, unsigned int size
);
1178 extern void blk_queue_lld_busy(struct request_queue
*q
, lld_busy_fn
*fn
);
1179 extern void blk_queue_segment_boundary(struct request_queue
*, unsigned long);
1180 extern void blk_queue_virt_boundary(struct request_queue
*, unsigned long);
1181 extern void blk_queue_prep_rq(struct request_queue
*, prep_rq_fn
*pfn
);
1182 extern void blk_queue_unprep_rq(struct request_queue
*, unprep_rq_fn
*ufn
);
1183 extern void blk_queue_dma_alignment(struct request_queue
*, int);
1184 extern void blk_queue_update_dma_alignment(struct request_queue
*, int);
1185 extern void blk_queue_softirq_done(struct request_queue
*, softirq_done_fn
*);
1186 extern void blk_queue_rq_timed_out(struct request_queue
*, rq_timed_out_fn
*);
1187 extern void blk_queue_rq_timeout(struct request_queue
*, unsigned int);
1188 extern void blk_queue_flush_queueable(struct request_queue
*q
, bool queueable
);
1189 extern void blk_queue_write_cache(struct request_queue
*q
, bool enabled
, bool fua
);
1190 extern struct backing_dev_info
*blk_get_backing_dev_info(struct block_device
*bdev
);
1192 static inline unsigned short blk_rq_nr_phys_segments(struct request
*rq
)
1194 if (rq
->rq_flags
& RQF_SPECIAL_PAYLOAD
)
1196 return rq
->nr_phys_segments
;
1199 extern int blk_rq_map_sg(struct request_queue
*, struct request
*, struct scatterlist
*);
1200 extern void blk_dump_rq_flags(struct request
*, char *);
1201 extern long nr_blockdev_pages(void);
1203 bool __must_check
blk_get_queue(struct request_queue
*);
1204 struct request_queue
*blk_alloc_queue(gfp_t
);
1205 struct request_queue
*blk_alloc_queue_node(gfp_t
, int);
1206 extern void blk_put_queue(struct request_queue
*);
1207 extern void blk_set_queue_dying(struct request_queue
*);
1210 * block layer runtime pm functions
1213 extern void blk_pm_runtime_init(struct request_queue
*q
, struct device
*dev
);
1214 extern int blk_pre_runtime_suspend(struct request_queue
*q
);
1215 extern void blk_post_runtime_suspend(struct request_queue
*q
, int err
);
1216 extern void blk_pre_runtime_resume(struct request_queue
*q
);
1217 extern void blk_post_runtime_resume(struct request_queue
*q
, int err
);
1218 extern void blk_set_runtime_active(struct request_queue
*q
);
1220 static inline void blk_pm_runtime_init(struct request_queue
*q
,
1221 struct device
*dev
) {}
1222 static inline int blk_pre_runtime_suspend(struct request_queue
*q
)
1226 static inline void blk_post_runtime_suspend(struct request_queue
*q
, int err
) {}
1227 static inline void blk_pre_runtime_resume(struct request_queue
*q
) {}
1228 static inline void blk_post_runtime_resume(struct request_queue
*q
, int err
) {}
1229 static inline void blk_set_runtime_active(struct request_queue
*q
) {}
1233 * blk_plug permits building a queue of related requests by holding the I/O
1234 * fragments for a short period. This allows merging of sequential requests
1235 * into single larger request. As the requests are moved from a per-task list to
1236 * the device's request_queue in a batch, this results in improved scalability
1237 * as the lock contention for request_queue lock is reduced.
1239 * It is ok not to disable preemption when adding the request to the plug list
1240 * or when attempting a merge, because blk_schedule_flush_list() will only flush
1241 * the plug list when the task sleeps by itself. For details, please see
1242 * schedule() where blk_schedule_flush_plug() is called.
1245 struct list_head list
; /* requests */
1246 struct list_head mq_list
; /* blk-mq requests */
1247 struct list_head cb_list
; /* md requires an unplug callback */
1249 #define BLK_MAX_REQUEST_COUNT 16
1250 #define BLK_PLUG_FLUSH_SIZE (128 * 1024)
1253 typedef void (*blk_plug_cb_fn
)(struct blk_plug_cb
*, bool);
1254 struct blk_plug_cb
{
1255 struct list_head list
;
1256 blk_plug_cb_fn callback
;
1259 extern struct blk_plug_cb
*blk_check_plugged(blk_plug_cb_fn unplug
,
1260 void *data
, int size
);
1261 extern void blk_start_plug(struct blk_plug
*);
1262 extern void blk_finish_plug(struct blk_plug
*);
1263 extern void blk_flush_plug_list(struct blk_plug
*, bool);
1265 static inline void blk_flush_plug(struct task_struct
*tsk
)
1267 struct blk_plug
*plug
= tsk
->plug
;
1270 blk_flush_plug_list(plug
, false);
1273 static inline void blk_schedule_flush_plug(struct task_struct
*tsk
)
1275 struct blk_plug
*plug
= tsk
->plug
;
1278 blk_flush_plug_list(plug
, true);
1281 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1283 struct blk_plug
*plug
= tsk
->plug
;
1286 (!list_empty(&plug
->list
) ||
1287 !list_empty(&plug
->mq_list
) ||
1288 !list_empty(&plug
->cb_list
));
1294 extern int blk_queue_start_tag(struct request_queue
*, struct request
*);
1295 extern struct request
*blk_queue_find_tag(struct request_queue
*, int);
1296 extern void blk_queue_end_tag(struct request_queue
*, struct request
*);
1297 extern int blk_queue_init_tags(struct request_queue
*, int, struct blk_queue_tag
*, int);
1298 extern void blk_queue_free_tags(struct request_queue
*);
1299 extern int blk_queue_resize_tags(struct request_queue
*, int);
1300 extern void blk_queue_invalidate_tags(struct request_queue
*);
1301 extern struct blk_queue_tag
*blk_init_tags(int, int);
1302 extern void blk_free_tags(struct blk_queue_tag
*);
1304 static inline struct request
*blk_map_queue_find_tag(struct blk_queue_tag
*bqt
,
1307 if (unlikely(bqt
== NULL
|| tag
>= bqt
->real_max_depth
))
1309 return bqt
->tag_index
[tag
];
1313 #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */
1314 #define BLKDEV_DISCARD_ZERO (1 << 1) /* must reliably zero data */
1316 extern int blkdev_issue_flush(struct block_device
*, gfp_t
, sector_t
*);
1317 extern int blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1318 sector_t nr_sects
, gfp_t gfp_mask
, unsigned long flags
);
1319 extern int __blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1320 sector_t nr_sects
, gfp_t gfp_mask
, int flags
,
1322 extern int blkdev_issue_write_same(struct block_device
*bdev
, sector_t sector
,
1323 sector_t nr_sects
, gfp_t gfp_mask
, struct page
*page
);
1324 extern int __blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1325 sector_t nr_sects
, gfp_t gfp_mask
, struct bio
**biop
,
1327 extern int blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1328 sector_t nr_sects
, gfp_t gfp_mask
, bool discard
);
1329 static inline int sb_issue_discard(struct super_block
*sb
, sector_t block
,
1330 sector_t nr_blocks
, gfp_t gfp_mask
, unsigned long flags
)
1332 return blkdev_issue_discard(sb
->s_bdev
, block
<< (sb
->s_blocksize_bits
- 9),
1333 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1336 static inline int sb_issue_zeroout(struct super_block
*sb
, sector_t block
,
1337 sector_t nr_blocks
, gfp_t gfp_mask
)
1339 return blkdev_issue_zeroout(sb
->s_bdev
,
1340 block
<< (sb
->s_blocksize_bits
- 9),
1341 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1345 extern int blk_verify_command(unsigned char *cmd
, fmode_t has_write_perm
);
1347 enum blk_default_limits
{
1348 BLK_MAX_SEGMENTS
= 128,
1349 BLK_SAFE_MAX_SECTORS
= 255,
1350 BLK_DEF_MAX_SECTORS
= 2560,
1351 BLK_MAX_SEGMENT_SIZE
= 65536,
1352 BLK_SEG_BOUNDARY_MASK
= 0xFFFFFFFFUL
,
1355 #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
1357 static inline unsigned long queue_bounce_pfn(struct request_queue
*q
)
1359 return q
->limits
.bounce_pfn
;
1362 static inline unsigned long queue_segment_boundary(struct request_queue
*q
)
1364 return q
->limits
.seg_boundary_mask
;
1367 static inline unsigned long queue_virt_boundary(struct request_queue
*q
)
1369 return q
->limits
.virt_boundary_mask
;
1372 static inline unsigned int queue_max_sectors(struct request_queue
*q
)
1374 return q
->limits
.max_sectors
;
1377 static inline unsigned int queue_max_hw_sectors(struct request_queue
*q
)
1379 return q
->limits
.max_hw_sectors
;
1382 static inline unsigned short queue_max_segments(struct request_queue
*q
)
1384 return q
->limits
.max_segments
;
1387 static inline unsigned int queue_max_segment_size(struct request_queue
*q
)
1389 return q
->limits
.max_segment_size
;
1392 static inline unsigned short queue_logical_block_size(struct request_queue
*q
)
1396 if (q
&& q
->limits
.logical_block_size
)
1397 retval
= q
->limits
.logical_block_size
;
1402 static inline unsigned short bdev_logical_block_size(struct block_device
*bdev
)
1404 return queue_logical_block_size(bdev_get_queue(bdev
));
1407 static inline unsigned int queue_physical_block_size(struct request_queue
*q
)
1409 return q
->limits
.physical_block_size
;
1412 static inline unsigned int bdev_physical_block_size(struct block_device
*bdev
)
1414 return queue_physical_block_size(bdev_get_queue(bdev
));
1417 static inline unsigned int queue_io_min(struct request_queue
*q
)
1419 return q
->limits
.io_min
;
1422 static inline int bdev_io_min(struct block_device
*bdev
)
1424 return queue_io_min(bdev_get_queue(bdev
));
1427 static inline unsigned int queue_io_opt(struct request_queue
*q
)
1429 return q
->limits
.io_opt
;
1432 static inline int bdev_io_opt(struct block_device
*bdev
)
1434 return queue_io_opt(bdev_get_queue(bdev
));
1437 static inline int queue_alignment_offset(struct request_queue
*q
)
1439 if (q
->limits
.misaligned
)
1442 return q
->limits
.alignment_offset
;
1445 static inline int queue_limit_alignment_offset(struct queue_limits
*lim
, sector_t sector
)
1447 unsigned int granularity
= max(lim
->physical_block_size
, lim
->io_min
);
1448 unsigned int alignment
= sector_div(sector
, granularity
>> 9) << 9;
1450 return (granularity
+ lim
->alignment_offset
- alignment
) % granularity
;
1453 static inline int bdev_alignment_offset(struct block_device
*bdev
)
1455 struct request_queue
*q
= bdev_get_queue(bdev
);
1457 if (q
->limits
.misaligned
)
1460 if (bdev
!= bdev
->bd_contains
)
1461 return bdev
->bd_part
->alignment_offset
;
1463 return q
->limits
.alignment_offset
;
1466 static inline int queue_discard_alignment(struct request_queue
*q
)
1468 if (q
->limits
.discard_misaligned
)
1471 return q
->limits
.discard_alignment
;
1474 static inline int queue_limit_discard_alignment(struct queue_limits
*lim
, sector_t sector
)
1476 unsigned int alignment
, granularity
, offset
;
1478 if (!lim
->max_discard_sectors
)
1481 /* Why are these in bytes, not sectors? */
1482 alignment
= lim
->discard_alignment
>> 9;
1483 granularity
= lim
->discard_granularity
>> 9;
1487 /* Offset of the partition start in 'granularity' sectors */
1488 offset
= sector_div(sector
, granularity
);
1490 /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1491 offset
= (granularity
+ alignment
- offset
) % granularity
;
1493 /* Turn it back into bytes, gaah */
1497 static inline int bdev_discard_alignment(struct block_device
*bdev
)
1499 struct request_queue
*q
= bdev_get_queue(bdev
);
1501 if (bdev
!= bdev
->bd_contains
)
1502 return bdev
->bd_part
->discard_alignment
;
1504 return q
->limits
.discard_alignment
;
1507 static inline unsigned int queue_discard_zeroes_data(struct request_queue
*q
)
1509 if (q
->limits
.max_discard_sectors
&& q
->limits
.discard_zeroes_data
== 1)
1515 static inline unsigned int bdev_discard_zeroes_data(struct block_device
*bdev
)
1517 return queue_discard_zeroes_data(bdev_get_queue(bdev
));
1520 static inline unsigned int bdev_write_same(struct block_device
*bdev
)
1522 struct request_queue
*q
= bdev_get_queue(bdev
);
1525 return q
->limits
.max_write_same_sectors
;
1530 static inline unsigned int bdev_write_zeroes_sectors(struct block_device
*bdev
)
1532 struct request_queue
*q
= bdev_get_queue(bdev
);
1535 return q
->limits
.max_write_zeroes_sectors
;
1540 static inline enum blk_zoned_model
bdev_zoned_model(struct block_device
*bdev
)
1542 struct request_queue
*q
= bdev_get_queue(bdev
);
1545 return blk_queue_zoned_model(q
);
1547 return BLK_ZONED_NONE
;
1550 static inline bool bdev_is_zoned(struct block_device
*bdev
)
1552 struct request_queue
*q
= bdev_get_queue(bdev
);
1555 return blk_queue_is_zoned(q
);
1560 static inline unsigned int bdev_zone_sectors(struct block_device
*bdev
)
1562 struct request_queue
*q
= bdev_get_queue(bdev
);
1565 return blk_queue_zone_sectors(q
);
1570 static inline int queue_dma_alignment(struct request_queue
*q
)
1572 return q
? q
->dma_alignment
: 511;
1575 static inline int blk_rq_aligned(struct request_queue
*q
, unsigned long addr
,
1578 unsigned int alignment
= queue_dma_alignment(q
) | q
->dma_pad_mask
;
1579 return !(addr
& alignment
) && !(len
& alignment
);
1582 /* assumes size > 256 */
1583 static inline unsigned int blksize_bits(unsigned int size
)
1585 unsigned int bits
= 8;
1589 } while (size
> 256);
1593 static inline unsigned int block_size(struct block_device
*bdev
)
1595 return bdev
->bd_block_size
;
1598 static inline bool queue_flush_queueable(struct request_queue
*q
)
1600 return !test_bit(QUEUE_FLAG_FLUSH_NQ
, &q
->queue_flags
);
1603 typedef struct {struct page
*v
;} Sector
;
1605 unsigned char *read_dev_sector(struct block_device
*, sector_t
, Sector
*);
1607 static inline void put_dev_sector(Sector p
)
1612 static inline bool __bvec_gap_to_prev(struct request_queue
*q
,
1613 struct bio_vec
*bprv
, unsigned int offset
)
1616 ((bprv
->bv_offset
+ bprv
->bv_len
) & queue_virt_boundary(q
));
1620 * Check if adding a bio_vec after bprv with offset would create a gap in
1621 * the SG list. Most drivers don't care about this, but some do.
1623 static inline bool bvec_gap_to_prev(struct request_queue
*q
,
1624 struct bio_vec
*bprv
, unsigned int offset
)
1626 if (!queue_virt_boundary(q
))
1628 return __bvec_gap_to_prev(q
, bprv
, offset
);
1632 * Check if the two bvecs from two bios can be merged to one segment.
1633 * If yes, no need to check gap between the two bios since the 1st bio
1634 * and the 1st bvec in the 2nd bio can be handled in one segment.
1636 static inline bool bios_segs_mergeable(struct request_queue
*q
,
1637 struct bio
*prev
, struct bio_vec
*prev_last_bv
,
1638 struct bio_vec
*next_first_bv
)
1640 if (!BIOVEC_PHYS_MERGEABLE(prev_last_bv
, next_first_bv
))
1642 if (!BIOVEC_SEG_BOUNDARY(q
, prev_last_bv
, next_first_bv
))
1644 if (prev
->bi_seg_back_size
+ next_first_bv
->bv_len
>
1645 queue_max_segment_size(q
))
1650 static inline bool bio_will_gap(struct request_queue
*q
, struct bio
*prev
,
1653 if (bio_has_data(prev
) && queue_virt_boundary(q
)) {
1654 struct bio_vec pb
, nb
;
1656 bio_get_last_bvec(prev
, &pb
);
1657 bio_get_first_bvec(next
, &nb
);
1659 if (!bios_segs_mergeable(q
, prev
, &pb
, &nb
))
1660 return __bvec_gap_to_prev(q
, &pb
, nb
.bv_offset
);
1666 static inline bool req_gap_back_merge(struct request
*req
, struct bio
*bio
)
1668 return bio_will_gap(req
->q
, req
->biotail
, bio
);
1671 static inline bool req_gap_front_merge(struct request
*req
, struct bio
*bio
)
1673 return bio_will_gap(req
->q
, bio
, req
->bio
);
1676 int kblockd_schedule_work(struct work_struct
*work
);
1677 int kblockd_schedule_work_on(int cpu
, struct work_struct
*work
);
1678 int kblockd_schedule_delayed_work(struct delayed_work
*dwork
, unsigned long delay
);
1679 int kblockd_schedule_delayed_work_on(int cpu
, struct delayed_work
*dwork
, unsigned long delay
);
1681 #ifdef CONFIG_BLK_CGROUP
1683 * This should not be using sched_clock(). A real patch is in progress
1684 * to fix this up, until that is in place we need to disable preemption
1685 * around sched_clock() in this function and set_io_start_time_ns().
1687 static inline void set_start_time_ns(struct request
*req
)
1690 req
->start_time_ns
= sched_clock();
1694 static inline void set_io_start_time_ns(struct request
*req
)
1697 req
->io_start_time_ns
= sched_clock();
1701 static inline uint64_t rq_start_time_ns(struct request
*req
)
1703 return req
->start_time_ns
;
1706 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1708 return req
->io_start_time_ns
;
1711 static inline void set_start_time_ns(struct request
*req
) {}
1712 static inline void set_io_start_time_ns(struct request
*req
) {}
1713 static inline uint64_t rq_start_time_ns(struct request
*req
)
1717 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1723 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1724 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1725 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1726 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1728 #if defined(CONFIG_BLK_DEV_INTEGRITY)
1730 enum blk_integrity_flags
{
1731 BLK_INTEGRITY_VERIFY
= 1 << 0,
1732 BLK_INTEGRITY_GENERATE
= 1 << 1,
1733 BLK_INTEGRITY_DEVICE_CAPABLE
= 1 << 2,
1734 BLK_INTEGRITY_IP_CHECKSUM
= 1 << 3,
1737 struct blk_integrity_iter
{
1741 unsigned int data_size
;
1742 unsigned short interval
;
1743 const char *disk_name
;
1746 typedef int (integrity_processing_fn
) (struct blk_integrity_iter
*);
1748 struct blk_integrity_profile
{
1749 integrity_processing_fn
*generate_fn
;
1750 integrity_processing_fn
*verify_fn
;
1754 extern void blk_integrity_register(struct gendisk
*, struct blk_integrity
*);
1755 extern void blk_integrity_unregister(struct gendisk
*);
1756 extern int blk_integrity_compare(struct gendisk
*, struct gendisk
*);
1757 extern int blk_rq_map_integrity_sg(struct request_queue
*, struct bio
*,
1758 struct scatterlist
*);
1759 extern int blk_rq_count_integrity_sg(struct request_queue
*, struct bio
*);
1760 extern bool blk_integrity_merge_rq(struct request_queue
*, struct request
*,
1762 extern bool blk_integrity_merge_bio(struct request_queue
*, struct request
*,
1765 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1767 struct blk_integrity
*bi
= &disk
->queue
->integrity
;
1776 struct blk_integrity
*bdev_get_integrity(struct block_device
*bdev
)
1778 return blk_get_integrity(bdev
->bd_disk
);
1781 static inline bool blk_integrity_rq(struct request
*rq
)
1783 return rq
->cmd_flags
& REQ_INTEGRITY
;
1786 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1789 q
->limits
.max_integrity_segments
= segs
;
1792 static inline unsigned short
1793 queue_max_integrity_segments(struct request_queue
*q
)
1795 return q
->limits
.max_integrity_segments
;
1798 static inline bool integrity_req_gap_back_merge(struct request
*req
,
1801 struct bio_integrity_payload
*bip
= bio_integrity(req
->bio
);
1802 struct bio_integrity_payload
*bip_next
= bio_integrity(next
);
1804 return bvec_gap_to_prev(req
->q
, &bip
->bip_vec
[bip
->bip_vcnt
- 1],
1805 bip_next
->bip_vec
[0].bv_offset
);
1808 static inline bool integrity_req_gap_front_merge(struct request
*req
,
1811 struct bio_integrity_payload
*bip
= bio_integrity(bio
);
1812 struct bio_integrity_payload
*bip_next
= bio_integrity(req
->bio
);
1814 return bvec_gap_to_prev(req
->q
, &bip
->bip_vec
[bip
->bip_vcnt
- 1],
1815 bip_next
->bip_vec
[0].bv_offset
);
1818 #else /* CONFIG_BLK_DEV_INTEGRITY */
1821 struct block_device
;
1823 struct blk_integrity
;
1825 static inline int blk_integrity_rq(struct request
*rq
)
1829 static inline int blk_rq_count_integrity_sg(struct request_queue
*q
,
1834 static inline int blk_rq_map_integrity_sg(struct request_queue
*q
,
1836 struct scatterlist
*s
)
1840 static inline struct blk_integrity
*bdev_get_integrity(struct block_device
*b
)
1844 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1848 static inline int blk_integrity_compare(struct gendisk
*a
, struct gendisk
*b
)
1852 static inline void blk_integrity_register(struct gendisk
*d
,
1853 struct blk_integrity
*b
)
1856 static inline void blk_integrity_unregister(struct gendisk
*d
)
1859 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1863 static inline unsigned short queue_max_integrity_segments(struct request_queue
*q
)
1867 static inline bool blk_integrity_merge_rq(struct request_queue
*rq
,
1873 static inline bool blk_integrity_merge_bio(struct request_queue
*rq
,
1880 static inline bool integrity_req_gap_back_merge(struct request
*req
,
1885 static inline bool integrity_req_gap_front_merge(struct request
*req
,
1891 #endif /* CONFIG_BLK_DEV_INTEGRITY */
1894 * struct blk_dax_ctl - control and output parameters for ->direct_access
1895 * @sector: (input) offset relative to a block_device
1896 * @addr: (output) kernel virtual address for @sector populated by driver
1897 * @pfn: (output) page frame number for @addr populated by driver
1898 * @size: (input) number of bytes requested
1900 struct blk_dax_ctl
{
1907 struct block_device_operations
{
1908 int (*open
) (struct block_device
*, fmode_t
);
1909 void (*release
) (struct gendisk
*, fmode_t
);
1910 int (*rw_page
)(struct block_device
*, sector_t
, struct page
*, bool);
1911 int (*ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1912 int (*compat_ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1913 long (*direct_access
)(struct block_device
*, sector_t
, void **, pfn_t
*,
1915 unsigned int (*check_events
) (struct gendisk
*disk
,
1916 unsigned int clearing
);
1917 /* ->media_changed() is DEPRECATED, use ->check_events() instead */
1918 int (*media_changed
) (struct gendisk
*);
1919 void (*unlock_native_capacity
) (struct gendisk
*);
1920 int (*revalidate_disk
) (struct gendisk
*);
1921 int (*getgeo
)(struct block_device
*, struct hd_geometry
*);
1922 /* this callback is with swap_lock and sometimes page table lock held */
1923 void (*swap_slot_free_notify
) (struct block_device
*, unsigned long);
1924 struct module
*owner
;
1925 const struct pr_ops
*pr_ops
;
1928 extern int __blkdev_driver_ioctl(struct block_device
*, fmode_t
, unsigned int,
1930 extern int bdev_read_page(struct block_device
*, sector_t
, struct page
*);
1931 extern int bdev_write_page(struct block_device
*, sector_t
, struct page
*,
1932 struct writeback_control
*);
1933 extern long bdev_direct_access(struct block_device
*, struct blk_dax_ctl
*);
1934 extern int bdev_dax_supported(struct super_block
*, int);
1935 extern bool bdev_dax_capable(struct block_device
*);
1936 #else /* CONFIG_BLOCK */
1938 struct block_device
;
1941 * stubs for when the block layer is configured out
1943 #define buffer_heads_over_limit 0
1945 static inline long nr_blockdev_pages(void)
1953 static inline void blk_start_plug(struct blk_plug
*plug
)
1957 static inline void blk_finish_plug(struct blk_plug
*plug
)
1961 static inline void blk_flush_plug(struct task_struct
*task
)
1965 static inline void blk_schedule_flush_plug(struct task_struct
*task
)
1970 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1975 static inline int blkdev_issue_flush(struct block_device
*bdev
, gfp_t gfp_mask
,
1976 sector_t
*error_sector
)
1981 #endif /* CONFIG_BLOCK */