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
;
43 struct blk_queue_stats
;
44 struct blk_stat_callback
;
46 #define BLKDEV_MIN_RQ 4
47 #define BLKDEV_MAX_RQ 128 /* Default maximum */
49 /* Must be consisitent with blk_mq_poll_stats_bkt() */
50 #define BLK_MQ_POLL_STATS_BKTS 16
53 * Maximum number of blkcg policies allowed to be registered concurrently.
54 * Defined here to simplify include dependency.
56 #define BLKCG_MAX_POLS 3
58 typedef void (rq_end_io_fn
)(struct request
*, int);
60 #define BLK_RL_SYNCFULL (1U << 0)
61 #define BLK_RL_ASYNCFULL (1U << 1)
64 struct request_queue
*q
; /* the queue this rl belongs to */
65 #ifdef CONFIG_BLK_CGROUP
66 struct blkcg_gq
*blkg
; /* blkg this request pool belongs to */
69 * count[], starved[], and wait[] are indexed by
70 * BLK_RW_SYNC/BLK_RW_ASYNC
75 wait_queue_head_t wait
[2];
81 typedef __u32 __bitwise req_flags_t
;
83 /* elevator knows about this request */
84 #define RQF_SORTED ((__force req_flags_t)(1 << 0))
85 /* drive already may have started this one */
86 #define RQF_STARTED ((__force req_flags_t)(1 << 1))
87 /* uses tagged queueing */
88 #define RQF_QUEUED ((__force req_flags_t)(1 << 2))
89 /* may not be passed by ioscheduler */
90 #define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3))
91 /* request for flush sequence */
92 #define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4))
93 /* merge of different types, fail separately */
94 #define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5))
95 /* track inflight for MQ */
96 #define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6))
97 /* don't call prep for this one */
98 #define RQF_DONTPREP ((__force req_flags_t)(1 << 7))
99 /* set for "ide_preempt" requests and also for requests for which the SCSI
100 "quiesce" state must be ignored. */
101 #define RQF_PREEMPT ((__force req_flags_t)(1 << 8))
102 /* contains copies of user pages */
103 #define RQF_COPY_USER ((__force req_flags_t)(1 << 9))
104 /* vaguely specified driver internal error. Ignored by the block layer */
105 #define RQF_FAILED ((__force req_flags_t)(1 << 10))
106 /* don't warn about errors */
107 #define RQF_QUIET ((__force req_flags_t)(1 << 11))
108 /* elevator private data attached */
109 #define RQF_ELVPRIV ((__force req_flags_t)(1 << 12))
110 /* account I/O stat */
111 #define RQF_IO_STAT ((__force req_flags_t)(1 << 13))
112 /* request came from our alloc pool */
113 #define RQF_ALLOCED ((__force req_flags_t)(1 << 14))
114 /* runtime pm request */
115 #define RQF_PM ((__force req_flags_t)(1 << 15))
116 /* on IO scheduler merge hash */
117 #define RQF_HASHED ((__force req_flags_t)(1 << 16))
118 /* IO stats tracking on */
119 #define RQF_STATS ((__force req_flags_t)(1 << 17))
120 /* Look at ->special_vec for the actual data payload instead of the
122 #define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18))
124 /* flags that prevent us from merging requests: */
125 #define RQF_NOMERGE_FLAGS \
126 (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD)
129 * Try to put the fields that are referenced together in the same cacheline.
131 * If you modify this structure, make sure to update blk_rq_init() and
132 * especially blk_mq_rq_ctx_init() to take care of the added fields.
135 struct list_head queuelist
;
137 struct call_single_data csd
;
141 struct request_queue
*q
;
142 struct blk_mq_ctx
*mq_ctx
;
145 unsigned int cmd_flags
; /* op and common flags */
146 req_flags_t rq_flags
;
150 unsigned long atomic_flags
;
152 /* the following two fields are internal, NEVER access directly */
153 unsigned int __data_len
; /* total data len */
155 sector_t __sector
; /* sector cursor */
161 * The hash is used inside the scheduler, and killed once the
162 * request reaches the dispatch list. The ipi_list is only used
163 * to queue the request for softirq completion, which is long
164 * after the request has been unhashed (and even removed from
165 * the dispatch list).
168 struct hlist_node hash
; /* merge hash */
169 struct list_head ipi_list
;
173 * The rb_node is only used inside the io scheduler, requests
174 * are pruned when moved to the dispatch queue. So let the
175 * completion_data share space with the rb_node.
178 struct rb_node rb_node
; /* sort/lookup */
179 struct bio_vec special_vec
;
180 void *completion_data
;
181 int error_count
; /* for legacy drivers, don't use */
185 * Three pointers are available for the IO schedulers, if they need
186 * more they have to dynamically allocate it. Flush requests are
187 * never put on the IO scheduler. So let the flush fields share
188 * space with the elevator data.
198 struct list_head list
;
199 rq_end_io_fn
*saved_end_io
;
203 struct gendisk
*rq_disk
;
204 struct hd_struct
*part
;
205 unsigned long start_time
;
206 struct blk_issue_stat issue_stat
;
207 #ifdef CONFIG_BLK_CGROUP
208 struct request_list
*rl
; /* rl this rq is alloced from */
209 unsigned long long start_time_ns
;
210 unsigned long long io_start_time_ns
; /* when passed to hardware */
212 /* Number of scatter-gather DMA addr+len pairs after
213 * physical address coalescing is performed.
215 unsigned short nr_phys_segments
;
216 #if defined(CONFIG_BLK_DEV_INTEGRITY)
217 unsigned short nr_integrity_segments
;
220 unsigned short ioprio
;
222 unsigned int timeout
;
224 void *special
; /* opaque pointer available for LLD use */
226 unsigned int extra_len
; /* length of alignment and padding */
228 unsigned long deadline
;
229 struct list_head timeout_list
;
232 * completion callback.
234 rq_end_io_fn
*end_io
;
238 struct request
*next_rq
;
241 static inline bool blk_rq_is_scsi(struct request
*rq
)
243 return req_op(rq
) == REQ_OP_SCSI_IN
|| req_op(rq
) == REQ_OP_SCSI_OUT
;
246 static inline bool blk_rq_is_private(struct request
*rq
)
248 return req_op(rq
) == REQ_OP_DRV_IN
|| req_op(rq
) == REQ_OP_DRV_OUT
;
251 static inline bool blk_rq_is_passthrough(struct request
*rq
)
253 return blk_rq_is_scsi(rq
) || blk_rq_is_private(rq
);
256 static inline unsigned short req_get_ioprio(struct request
*req
)
261 #include <linux/elevator.h>
263 struct blk_queue_ctx
;
265 typedef void (request_fn_proc
) (struct request_queue
*q
);
266 typedef blk_qc_t (make_request_fn
) (struct request_queue
*q
, struct bio
*bio
);
267 typedef int (prep_rq_fn
) (struct request_queue
*, struct request
*);
268 typedef void (unprep_rq_fn
) (struct request_queue
*, struct request
*);
271 typedef void (softirq_done_fn
)(struct request
*);
272 typedef int (dma_drain_needed_fn
)(struct request
*);
273 typedef int (lld_busy_fn
) (struct request_queue
*q
);
274 typedef int (bsg_job_fn
) (struct bsg_job
*);
275 typedef int (init_rq_fn
)(struct request_queue
*, struct request
*, gfp_t
);
276 typedef void (exit_rq_fn
)(struct request_queue
*, struct request
*);
278 enum blk_eh_timer_return
{
284 typedef enum blk_eh_timer_return (rq_timed_out_fn
)(struct request
*);
286 enum blk_queue_state
{
291 struct blk_queue_tag
{
292 struct request
**tag_index
; /* map of busy tags */
293 unsigned long *tag_map
; /* bit map of free/busy tags */
294 int max_depth
; /* what we will send to device */
295 int real_max_depth
; /* what the array can hold */
296 atomic_t refcnt
; /* map can be shared */
297 int alloc_policy
; /* tag allocation policy */
298 int next_tag
; /* next tag */
300 #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */
301 #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */
303 #define BLK_SCSI_MAX_CMDS (256)
304 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
307 * Zoned block device models (zoned limit).
309 enum blk_zoned_model
{
310 BLK_ZONED_NONE
, /* Regular block device */
311 BLK_ZONED_HA
, /* Host-aware zoned block device */
312 BLK_ZONED_HM
, /* Host-managed zoned block device */
315 struct queue_limits
{
316 unsigned long bounce_pfn
;
317 unsigned long seg_boundary_mask
;
318 unsigned long virt_boundary_mask
;
320 unsigned int max_hw_sectors
;
321 unsigned int max_dev_sectors
;
322 unsigned int chunk_sectors
;
323 unsigned int max_sectors
;
324 unsigned int max_segment_size
;
325 unsigned int physical_block_size
;
326 unsigned int alignment_offset
;
329 unsigned int max_discard_sectors
;
330 unsigned int max_hw_discard_sectors
;
331 unsigned int max_write_same_sectors
;
332 unsigned int max_write_zeroes_sectors
;
333 unsigned int discard_granularity
;
334 unsigned int discard_alignment
;
336 unsigned short logical_block_size
;
337 unsigned short max_segments
;
338 unsigned short max_integrity_segments
;
339 unsigned short max_discard_segments
;
341 unsigned char misaligned
;
342 unsigned char discard_misaligned
;
343 unsigned char cluster
;
344 unsigned char raid_partial_stripes_expensive
;
345 enum blk_zoned_model zoned
;
348 #ifdef CONFIG_BLK_DEV_ZONED
350 struct blk_zone_report_hdr
{
351 unsigned int nr_zones
;
355 extern int blkdev_report_zones(struct block_device
*bdev
,
356 sector_t sector
, struct blk_zone
*zones
,
357 unsigned int *nr_zones
, gfp_t gfp_mask
);
358 extern int blkdev_reset_zones(struct block_device
*bdev
, sector_t sectors
,
359 sector_t nr_sectors
, gfp_t gfp_mask
);
361 extern int blkdev_report_zones_ioctl(struct block_device
*bdev
, fmode_t mode
,
362 unsigned int cmd
, unsigned long arg
);
363 extern int blkdev_reset_zones_ioctl(struct block_device
*bdev
, fmode_t mode
,
364 unsigned int cmd
, unsigned long arg
);
366 #else /* CONFIG_BLK_DEV_ZONED */
368 static inline int blkdev_report_zones_ioctl(struct block_device
*bdev
,
369 fmode_t mode
, unsigned int cmd
,
375 static inline int blkdev_reset_zones_ioctl(struct block_device
*bdev
,
376 fmode_t mode
, unsigned int cmd
,
382 #endif /* CONFIG_BLK_DEV_ZONED */
384 struct request_queue
{
386 * Together with queue_head for cacheline sharing
388 struct list_head queue_head
;
389 struct request
*last_merge
;
390 struct elevator_queue
*elevator
;
391 int nr_rqs
[2]; /* # allocated [a]sync rqs */
392 int nr_rqs_elvpriv
; /* # allocated rqs w/ elvpriv */
394 struct blk_queue_stats
*stats
;
398 * If blkcg is not used, @q->root_rl serves all requests. If blkcg
399 * is used, root blkg allocates from @q->root_rl and all other
400 * blkgs from their own blkg->rl. Which one to use should be
401 * determined using bio_request_list().
403 struct request_list root_rl
;
405 request_fn_proc
*request_fn
;
406 make_request_fn
*make_request_fn
;
407 prep_rq_fn
*prep_rq_fn
;
408 unprep_rq_fn
*unprep_rq_fn
;
409 softirq_done_fn
*softirq_done_fn
;
410 rq_timed_out_fn
*rq_timed_out_fn
;
411 dma_drain_needed_fn
*dma_drain_needed
;
412 lld_busy_fn
*lld_busy_fn
;
413 init_rq_fn
*init_rq_fn
;
414 exit_rq_fn
*exit_rq_fn
;
416 const struct blk_mq_ops
*mq_ops
;
418 unsigned int *mq_map
;
421 struct blk_mq_ctx __percpu
*queue_ctx
;
422 unsigned int nr_queues
;
424 unsigned int queue_depth
;
426 /* hw dispatch queues */
427 struct blk_mq_hw_ctx
**queue_hw_ctx
;
428 unsigned int nr_hw_queues
;
431 * Dispatch queue sorting
434 struct request
*boundary_rq
;
437 * Delayed queue handling
439 struct delayed_work delay_work
;
441 struct backing_dev_info
*backing_dev_info
;
444 * The queue owner gets to use this for whatever they like.
445 * ll_rw_blk doesn't touch it.
450 * various queue flags, see QUEUE_* below
452 unsigned long queue_flags
;
455 * ida allocated id for this queue. Used to index queues from
461 * queue needs bounce pages for pages above this limit
466 * protects queue structures from reentrancy. ->__queue_lock should
467 * _never_ be used directly, it is queue private. always use
470 spinlock_t __queue_lock
;
471 spinlock_t
*queue_lock
;
481 struct kobject mq_kobj
;
483 #ifdef CONFIG_BLK_DEV_INTEGRITY
484 struct blk_integrity integrity
;
485 #endif /* CONFIG_BLK_DEV_INTEGRITY */
490 unsigned int nr_pending
;
496 unsigned long nr_requests
; /* Max # of requests */
497 unsigned int nr_congestion_on
;
498 unsigned int nr_congestion_off
;
499 unsigned int nr_batching
;
501 unsigned int dma_drain_size
;
502 void *dma_drain_buffer
;
503 unsigned int dma_pad_mask
;
504 unsigned int dma_alignment
;
506 struct blk_queue_tag
*queue_tags
;
507 struct list_head tag_busy_list
;
509 unsigned int nr_sorted
;
510 unsigned int in_flight
[2];
513 * Number of active block driver functions for which blk_drain_queue()
514 * must wait. Must be incremented around functions that unlock the
515 * queue_lock internally, e.g. scsi_request_fn().
517 unsigned int request_fn_active
;
519 unsigned int rq_timeout
;
522 struct blk_stat_callback
*poll_cb
;
523 struct blk_rq_stat poll_stat
[BLK_MQ_POLL_STATS_BKTS
];
525 struct timer_list timeout
;
526 struct work_struct timeout_work
;
527 struct list_head timeout_list
;
529 struct list_head icq_list
;
530 #ifdef CONFIG_BLK_CGROUP
531 DECLARE_BITMAP (blkcg_pols
, BLKCG_MAX_POLS
);
532 struct blkcg_gq
*root_blkg
;
533 struct list_head blkg_list
;
536 struct queue_limits limits
;
541 unsigned int sg_timeout
;
542 unsigned int sg_reserved_size
;
544 #ifdef CONFIG_BLK_DEV_IO_TRACE
545 struct blk_trace
*blk_trace
;
548 * for flush operations
550 struct blk_flush_queue
*fq
;
552 struct list_head requeue_list
;
553 spinlock_t requeue_lock
;
554 struct delayed_work requeue_work
;
556 struct mutex sysfs_lock
;
559 atomic_t mq_freeze_depth
;
561 #if defined(CONFIG_BLK_DEV_BSG)
562 bsg_job_fn
*bsg_job_fn
;
564 struct bsg_class_device bsg_dev
;
567 #ifdef CONFIG_BLK_DEV_THROTTLING
569 struct throtl_data
*td
;
571 struct rcu_head rcu_head
;
572 wait_queue_head_t mq_freeze_wq
;
573 struct percpu_ref q_usage_counter
;
574 struct list_head all_q_node
;
576 struct blk_mq_tag_set
*tag_set
;
577 struct list_head tag_set_list
;
578 struct bio_set
*bio_split
;
580 #ifdef CONFIG_BLK_DEBUG_FS
581 struct dentry
*debugfs_dir
;
582 struct dentry
*sched_debugfs_dir
;
585 bool mq_sysfs_init_done
;
590 struct work_struct release_work
;
593 #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */
594 #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */
595 #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */
596 #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */
597 #define QUEUE_FLAG_DYING 5 /* queue being torn down */
598 #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */
599 #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */
600 #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */
601 #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */
602 #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */
603 #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */
604 #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */
605 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
606 #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */
607 #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */
608 #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */
609 #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */
610 #define QUEUE_FLAG_SECERASE 17 /* supports secure erase */
611 #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */
612 #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */
613 #define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */
614 #define QUEUE_FLAG_NO_SG_MERGE 21 /* don't attempt to merge SG segments*/
615 #define QUEUE_FLAG_POLL 22 /* IO polling enabled if set */
616 #define QUEUE_FLAG_WC 23 /* Write back caching */
617 #define QUEUE_FLAG_FUA 24 /* device supports FUA writes */
618 #define QUEUE_FLAG_FLUSH_NQ 25 /* flush not queueuable */
619 #define QUEUE_FLAG_DAX 26 /* device supports DAX */
620 #define QUEUE_FLAG_STATS 27 /* track rq completion times */
621 #define QUEUE_FLAG_POLL_STATS 28 /* collecting stats for hybrid polling */
622 #define QUEUE_FLAG_REGISTERED 29 /* queue has been registered to a disk */
624 #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
625 (1 << QUEUE_FLAG_STACKABLE) | \
626 (1 << QUEUE_FLAG_SAME_COMP) | \
627 (1 << QUEUE_FLAG_ADD_RANDOM))
629 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
630 (1 << QUEUE_FLAG_STACKABLE) | \
631 (1 << QUEUE_FLAG_SAME_COMP) | \
632 (1 << QUEUE_FLAG_POLL))
634 static inline void queue_lockdep_assert_held(struct request_queue
*q
)
637 lockdep_assert_held(q
->queue_lock
);
640 static inline void queue_flag_set_unlocked(unsigned int flag
,
641 struct request_queue
*q
)
643 __set_bit(flag
, &q
->queue_flags
);
646 static inline int queue_flag_test_and_clear(unsigned int flag
,
647 struct request_queue
*q
)
649 queue_lockdep_assert_held(q
);
651 if (test_bit(flag
, &q
->queue_flags
)) {
652 __clear_bit(flag
, &q
->queue_flags
);
659 static inline int queue_flag_test_and_set(unsigned int flag
,
660 struct request_queue
*q
)
662 queue_lockdep_assert_held(q
);
664 if (!test_bit(flag
, &q
->queue_flags
)) {
665 __set_bit(flag
, &q
->queue_flags
);
672 static inline void queue_flag_set(unsigned int flag
, struct request_queue
*q
)
674 queue_lockdep_assert_held(q
);
675 __set_bit(flag
, &q
->queue_flags
);
678 static inline void queue_flag_clear_unlocked(unsigned int flag
,
679 struct request_queue
*q
)
681 __clear_bit(flag
, &q
->queue_flags
);
684 static inline int queue_in_flight(struct request_queue
*q
)
686 return q
->in_flight
[0] + q
->in_flight
[1];
689 static inline void queue_flag_clear(unsigned int flag
, struct request_queue
*q
)
691 queue_lockdep_assert_held(q
);
692 __clear_bit(flag
, &q
->queue_flags
);
695 #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
696 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
697 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
698 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
699 #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags)
700 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
701 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
702 #define blk_queue_noxmerges(q) \
703 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
704 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
705 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
706 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
707 #define blk_queue_stackable(q) \
708 test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
709 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
710 #define blk_queue_secure_erase(q) \
711 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
712 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
714 #define blk_noretry_request(rq) \
715 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
716 REQ_FAILFAST_DRIVER))
718 static inline bool blk_account_rq(struct request
*rq
)
720 return (rq
->rq_flags
& RQF_STARTED
) && !blk_rq_is_passthrough(rq
);
723 #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
724 #define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
725 /* rq->queuelist of dequeued request must be list_empty() */
726 #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
728 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
730 #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ)
733 * Driver can handle struct request, if it either has an old style
734 * request_fn defined, or is blk-mq based.
736 static inline bool queue_is_rq_based(struct request_queue
*q
)
738 return q
->request_fn
|| q
->mq_ops
;
741 static inline unsigned int blk_queue_cluster(struct request_queue
*q
)
743 return q
->limits
.cluster
;
746 static inline enum blk_zoned_model
747 blk_queue_zoned_model(struct request_queue
*q
)
749 return q
->limits
.zoned
;
752 static inline bool blk_queue_is_zoned(struct request_queue
*q
)
754 switch (blk_queue_zoned_model(q
)) {
763 static inline unsigned int blk_queue_zone_sectors(struct request_queue
*q
)
765 return blk_queue_is_zoned(q
) ? q
->limits
.chunk_sectors
: 0;
768 static inline bool rq_is_sync(struct request
*rq
)
770 return op_is_sync(rq
->cmd_flags
);
773 static inline bool blk_rl_full(struct request_list
*rl
, bool sync
)
775 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
777 return rl
->flags
& flag
;
780 static inline void blk_set_rl_full(struct request_list
*rl
, bool sync
)
782 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
787 static inline void blk_clear_rl_full(struct request_list
*rl
, bool sync
)
789 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
794 static inline bool rq_mergeable(struct request
*rq
)
796 if (blk_rq_is_passthrough(rq
))
799 if (req_op(rq
) == REQ_OP_FLUSH
)
802 if (req_op(rq
) == REQ_OP_WRITE_ZEROES
)
805 if (rq
->cmd_flags
& REQ_NOMERGE_FLAGS
)
807 if (rq
->rq_flags
& RQF_NOMERGE_FLAGS
)
813 static inline bool blk_write_same_mergeable(struct bio
*a
, struct bio
*b
)
815 if (bio_data(a
) == bio_data(b
))
821 static inline unsigned int blk_queue_depth(struct request_queue
*q
)
824 return q
->queue_depth
;
826 return q
->nr_requests
;
830 * q->prep_rq_fn return values
833 BLKPREP_OK
, /* serve it */
834 BLKPREP_KILL
, /* fatal error, kill, return -EIO */
835 BLKPREP_DEFER
, /* leave on queue */
836 BLKPREP_INVALID
, /* invalid command, kill, return -EREMOTEIO */
839 extern unsigned long blk_max_low_pfn
, blk_max_pfn
;
842 * standard bounce addresses:
844 * BLK_BOUNCE_HIGH : bounce all highmem pages
845 * BLK_BOUNCE_ANY : don't bounce anything
846 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
849 #if BITS_PER_LONG == 32
850 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
852 #define BLK_BOUNCE_HIGH -1ULL
854 #define BLK_BOUNCE_ANY (-1ULL)
855 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
858 * default timeout for SG_IO if none specified
860 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
861 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
864 extern int init_emergency_isa_pool(void);
865 extern void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
);
867 static inline int init_emergency_isa_pool(void)
871 static inline void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
)
874 #endif /* CONFIG_MMU */
880 unsigned long offset
;
885 struct req_iterator
{
886 struct bvec_iter iter
;
890 /* This should not be used directly - use rq_for_each_segment */
891 #define for_each_bio(_bio) \
892 for (; _bio; _bio = _bio->bi_next)
893 #define __rq_for_each_bio(_bio, rq) \
895 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
897 #define rq_for_each_segment(bvl, _rq, _iter) \
898 __rq_for_each_bio(_iter.bio, _rq) \
899 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
901 #define rq_iter_last(bvec, _iter) \
902 (_iter.bio->bi_next == NULL && \
903 bio_iter_last(bvec, _iter.iter))
905 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
906 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
908 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
909 extern void rq_flush_dcache_pages(struct request
*rq
);
911 static inline void rq_flush_dcache_pages(struct request
*rq
)
917 #define vfs_msg(sb, level, fmt, ...) \
918 __vfs_msg(sb, level, fmt, ##__VA_ARGS__)
920 #define vfs_msg(sb, level, fmt, ...) \
922 no_printk(fmt, ##__VA_ARGS__); \
923 __vfs_msg(sb, "", " "); \
927 extern int blk_register_queue(struct gendisk
*disk
);
928 extern void blk_unregister_queue(struct gendisk
*disk
);
929 extern blk_qc_t
generic_make_request(struct bio
*bio
);
930 extern void blk_rq_init(struct request_queue
*q
, struct request
*rq
);
931 extern void blk_init_request_from_bio(struct request
*req
, struct bio
*bio
);
932 extern void blk_put_request(struct request
*);
933 extern void __blk_put_request(struct request_queue
*, struct request
*);
934 extern struct request
*blk_get_request(struct request_queue
*, int, gfp_t
);
935 extern void blk_requeue_request(struct request_queue
*, struct request
*);
936 extern int blk_lld_busy(struct request_queue
*q
);
937 extern int blk_rq_prep_clone(struct request
*rq
, struct request
*rq_src
,
938 struct bio_set
*bs
, gfp_t gfp_mask
,
939 int (*bio_ctr
)(struct bio
*, struct bio
*, void *),
941 extern void blk_rq_unprep_clone(struct request
*rq
);
942 extern int blk_insert_cloned_request(struct request_queue
*q
,
944 extern int blk_rq_append_bio(struct request
*rq
, struct bio
*bio
);
945 extern void blk_delay_queue(struct request_queue
*, unsigned long);
946 extern void blk_queue_split(struct request_queue
*, struct bio
**,
948 extern void blk_recount_segments(struct request_queue
*, struct bio
*);
949 extern int scsi_verify_blk_ioctl(struct block_device
*, unsigned int);
950 extern int scsi_cmd_blk_ioctl(struct block_device
*, fmode_t
,
951 unsigned int, void __user
*);
952 extern int scsi_cmd_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
953 unsigned int, void __user
*);
954 extern int sg_scsi_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
955 struct scsi_ioctl_command __user
*);
957 extern int blk_queue_enter(struct request_queue
*q
, bool nowait
);
958 extern void blk_queue_exit(struct request_queue
*q
);
959 extern void blk_start_queue(struct request_queue
*q
);
960 extern void blk_start_queue_async(struct request_queue
*q
);
961 extern void blk_stop_queue(struct request_queue
*q
);
962 extern void blk_sync_queue(struct request_queue
*q
);
963 extern void __blk_stop_queue(struct request_queue
*q
);
964 extern void __blk_run_queue(struct request_queue
*q
);
965 extern void __blk_run_queue_uncond(struct request_queue
*q
);
966 extern void blk_run_queue(struct request_queue
*);
967 extern void blk_run_queue_async(struct request_queue
*q
);
968 extern void blk_mq_quiesce_queue(struct request_queue
*q
);
969 extern int blk_rq_map_user(struct request_queue
*, struct request
*,
970 struct rq_map_data
*, void __user
*, unsigned long,
972 extern int blk_rq_unmap_user(struct bio
*);
973 extern int blk_rq_map_kern(struct request_queue
*, struct request
*, void *, unsigned int, gfp_t
);
974 extern int blk_rq_map_user_iov(struct request_queue
*, struct request
*,
975 struct rq_map_data
*, const struct iov_iter
*,
977 extern void blk_execute_rq(struct request_queue
*, struct gendisk
*,
978 struct request
*, int);
979 extern void blk_execute_rq_nowait(struct request_queue
*, struct gendisk
*,
980 struct request
*, int, rq_end_io_fn
*);
982 bool blk_mq_poll(struct request_queue
*q
, blk_qc_t cookie
);
984 static inline struct request_queue
*bdev_get_queue(struct block_device
*bdev
)
986 return bdev
->bd_disk
->queue
; /* this is never NULL */
990 * blk_rq_pos() : the current sector
991 * blk_rq_bytes() : bytes left in the entire request
992 * blk_rq_cur_bytes() : bytes left in the current segment
993 * blk_rq_err_bytes() : bytes left till the next error boundary
994 * blk_rq_sectors() : sectors left in the entire request
995 * blk_rq_cur_sectors() : sectors left in the current segment
997 static inline sector_t
blk_rq_pos(const struct request
*rq
)
1002 static inline unsigned int blk_rq_bytes(const struct request
*rq
)
1004 return rq
->__data_len
;
1007 static inline int blk_rq_cur_bytes(const struct request
*rq
)
1009 return rq
->bio
? bio_cur_bytes(rq
->bio
) : 0;
1012 extern unsigned int blk_rq_err_bytes(const struct request
*rq
);
1014 static inline unsigned int blk_rq_sectors(const struct request
*rq
)
1016 return blk_rq_bytes(rq
) >> 9;
1019 static inline unsigned int blk_rq_cur_sectors(const struct request
*rq
)
1021 return blk_rq_cur_bytes(rq
) >> 9;
1025 * Some commands like WRITE SAME have a payload or data transfer size which
1026 * is different from the size of the request. Any driver that supports such
1027 * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to
1028 * calculate the data transfer size.
1030 static inline unsigned int blk_rq_payload_bytes(struct request
*rq
)
1032 if (rq
->rq_flags
& RQF_SPECIAL_PAYLOAD
)
1033 return rq
->special_vec
.bv_len
;
1034 return blk_rq_bytes(rq
);
1037 static inline unsigned int blk_queue_get_max_sectors(struct request_queue
*q
,
1040 if (unlikely(op
== REQ_OP_DISCARD
|| op
== REQ_OP_SECURE_ERASE
))
1041 return min(q
->limits
.max_discard_sectors
, UINT_MAX
>> 9);
1043 if (unlikely(op
== REQ_OP_WRITE_SAME
))
1044 return q
->limits
.max_write_same_sectors
;
1046 if (unlikely(op
== REQ_OP_WRITE_ZEROES
))
1047 return q
->limits
.max_write_zeroes_sectors
;
1049 return q
->limits
.max_sectors
;
1053 * Return maximum size of a request at given offset. Only valid for
1054 * file system requests.
1056 static inline unsigned int blk_max_size_offset(struct request_queue
*q
,
1059 if (!q
->limits
.chunk_sectors
)
1060 return q
->limits
.max_sectors
;
1062 return q
->limits
.chunk_sectors
-
1063 (offset
& (q
->limits
.chunk_sectors
- 1));
1066 static inline unsigned int blk_rq_get_max_sectors(struct request
*rq
,
1069 struct request_queue
*q
= rq
->q
;
1071 if (blk_rq_is_passthrough(rq
))
1072 return q
->limits
.max_hw_sectors
;
1074 if (!q
->limits
.chunk_sectors
||
1075 req_op(rq
) == REQ_OP_DISCARD
||
1076 req_op(rq
) == REQ_OP_SECURE_ERASE
)
1077 return blk_queue_get_max_sectors(q
, req_op(rq
));
1079 return min(blk_max_size_offset(q
, offset
),
1080 blk_queue_get_max_sectors(q
, req_op(rq
)));
1083 static inline unsigned int blk_rq_count_bios(struct request
*rq
)
1085 unsigned int nr_bios
= 0;
1088 __rq_for_each_bio(bio
, rq
)
1095 * Request issue related functions.
1097 extern struct request
*blk_peek_request(struct request_queue
*q
);
1098 extern void blk_start_request(struct request
*rq
);
1099 extern struct request
*blk_fetch_request(struct request_queue
*q
);
1102 * Request completion related functions.
1104 * blk_update_request() completes given number of bytes and updates
1105 * the request without completing it.
1107 * blk_end_request() and friends. __blk_end_request() must be called
1108 * with the request queue spinlock acquired.
1110 * Several drivers define their own end_request and call
1111 * blk_end_request() for parts of the original function.
1112 * This prevents code duplication in drivers.
1114 extern bool blk_update_request(struct request
*rq
, int error
,
1115 unsigned int nr_bytes
);
1116 extern void blk_finish_request(struct request
*rq
, int error
);
1117 extern bool blk_end_request(struct request
*rq
, int error
,
1118 unsigned int nr_bytes
);
1119 extern void blk_end_request_all(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
);
1125 extern void blk_complete_request(struct request
*);
1126 extern void __blk_complete_request(struct request
*);
1127 extern void blk_abort_request(struct request
*);
1128 extern void blk_unprep_request(struct request
*);
1131 * Access functions for manipulating queue properties
1133 extern struct request_queue
*blk_init_queue_node(request_fn_proc
*rfn
,
1134 spinlock_t
*lock
, int node_id
);
1135 extern struct request_queue
*blk_init_queue(request_fn_proc
*, spinlock_t
*);
1136 extern int blk_init_allocated_queue(struct request_queue
*);
1137 extern void blk_cleanup_queue(struct request_queue
*);
1138 extern void blk_queue_make_request(struct request_queue
*, make_request_fn
*);
1139 extern void blk_queue_bounce_limit(struct request_queue
*, u64
);
1140 extern void blk_queue_max_hw_sectors(struct request_queue
*, unsigned int);
1141 extern void blk_queue_chunk_sectors(struct request_queue
*, unsigned int);
1142 extern void blk_queue_max_segments(struct request_queue
*, unsigned short);
1143 extern void blk_queue_max_discard_segments(struct request_queue
*,
1145 extern void blk_queue_max_segment_size(struct request_queue
*, unsigned int);
1146 extern void blk_queue_max_discard_sectors(struct request_queue
*q
,
1147 unsigned int max_discard_sectors
);
1148 extern void blk_queue_max_write_same_sectors(struct request_queue
*q
,
1149 unsigned int max_write_same_sectors
);
1150 extern void blk_queue_max_write_zeroes_sectors(struct request_queue
*q
,
1151 unsigned int max_write_same_sectors
);
1152 extern void blk_queue_logical_block_size(struct request_queue
*, unsigned short);
1153 extern void blk_queue_physical_block_size(struct request_queue
*, unsigned int);
1154 extern void blk_queue_alignment_offset(struct request_queue
*q
,
1155 unsigned int alignment
);
1156 extern void blk_limits_io_min(struct queue_limits
*limits
, unsigned int min
);
1157 extern void blk_queue_io_min(struct request_queue
*q
, unsigned int min
);
1158 extern void blk_limits_io_opt(struct queue_limits
*limits
, unsigned int opt
);
1159 extern void blk_queue_io_opt(struct request_queue
*q
, unsigned int opt
);
1160 extern void blk_set_queue_depth(struct request_queue
*q
, unsigned int depth
);
1161 extern void blk_set_default_limits(struct queue_limits
*lim
);
1162 extern void blk_set_stacking_limits(struct queue_limits
*lim
);
1163 extern int blk_stack_limits(struct queue_limits
*t
, struct queue_limits
*b
,
1165 extern int bdev_stack_limits(struct queue_limits
*t
, struct block_device
*bdev
,
1167 extern void disk_stack_limits(struct gendisk
*disk
, struct block_device
*bdev
,
1169 extern void blk_queue_stack_limits(struct request_queue
*t
, struct request_queue
*b
);
1170 extern void blk_queue_dma_pad(struct request_queue
*, unsigned int);
1171 extern void blk_queue_update_dma_pad(struct request_queue
*, unsigned int);
1172 extern int blk_queue_dma_drain(struct request_queue
*q
,
1173 dma_drain_needed_fn
*dma_drain_needed
,
1174 void *buf
, unsigned int size
);
1175 extern void blk_queue_lld_busy(struct request_queue
*q
, lld_busy_fn
*fn
);
1176 extern void blk_queue_segment_boundary(struct request_queue
*, unsigned long);
1177 extern void blk_queue_virt_boundary(struct request_queue
*, unsigned long);
1178 extern void blk_queue_prep_rq(struct request_queue
*, prep_rq_fn
*pfn
);
1179 extern void blk_queue_unprep_rq(struct request_queue
*, unprep_rq_fn
*ufn
);
1180 extern void blk_queue_dma_alignment(struct request_queue
*, int);
1181 extern void blk_queue_update_dma_alignment(struct request_queue
*, int);
1182 extern void blk_queue_softirq_done(struct request_queue
*, softirq_done_fn
*);
1183 extern void blk_queue_rq_timed_out(struct request_queue
*, rq_timed_out_fn
*);
1184 extern void blk_queue_rq_timeout(struct request_queue
*, unsigned int);
1185 extern void blk_queue_flush_queueable(struct request_queue
*q
, bool queueable
);
1186 extern void blk_queue_write_cache(struct request_queue
*q
, bool enabled
, bool fua
);
1189 * Number of physical segments as sent to the device.
1191 * Normally this is the number of discontiguous data segments sent by the
1192 * submitter. But for data-less command like discard we might have no
1193 * actual data segments submitted, but the driver might have to add it's
1194 * own special payload. In that case we still return 1 here so that this
1195 * special payload will be mapped.
1197 static inline unsigned short blk_rq_nr_phys_segments(struct request
*rq
)
1199 if (rq
->rq_flags
& RQF_SPECIAL_PAYLOAD
)
1201 return rq
->nr_phys_segments
;
1205 * Number of discard segments (or ranges) the driver needs to fill in.
1206 * Each discard bio merged into a request is counted as one segment.
1208 static inline unsigned short blk_rq_nr_discard_segments(struct request
*rq
)
1210 return max_t(unsigned short, rq
->nr_phys_segments
, 1);
1213 extern int blk_rq_map_sg(struct request_queue
*, struct request
*, struct scatterlist
*);
1214 extern void blk_dump_rq_flags(struct request
*, char *);
1215 extern long nr_blockdev_pages(void);
1217 bool __must_check
blk_get_queue(struct request_queue
*);
1218 struct request_queue
*blk_alloc_queue(gfp_t
);
1219 struct request_queue
*blk_alloc_queue_node(gfp_t
, int);
1220 extern void blk_put_queue(struct request_queue
*);
1221 extern void blk_set_queue_dying(struct request_queue
*);
1224 * block layer runtime pm functions
1227 extern void blk_pm_runtime_init(struct request_queue
*q
, struct device
*dev
);
1228 extern int blk_pre_runtime_suspend(struct request_queue
*q
);
1229 extern void blk_post_runtime_suspend(struct request_queue
*q
, int err
);
1230 extern void blk_pre_runtime_resume(struct request_queue
*q
);
1231 extern void blk_post_runtime_resume(struct request_queue
*q
, int err
);
1232 extern void blk_set_runtime_active(struct request_queue
*q
);
1234 static inline void blk_pm_runtime_init(struct request_queue
*q
,
1235 struct device
*dev
) {}
1236 static inline int blk_pre_runtime_suspend(struct request_queue
*q
)
1240 static inline void blk_post_runtime_suspend(struct request_queue
*q
, int err
) {}
1241 static inline void blk_pre_runtime_resume(struct request_queue
*q
) {}
1242 static inline void blk_post_runtime_resume(struct request_queue
*q
, int err
) {}
1243 static inline void blk_set_runtime_active(struct request_queue
*q
) {}
1247 * blk_plug permits building a queue of related requests by holding the I/O
1248 * fragments for a short period. This allows merging of sequential requests
1249 * into single larger request. As the requests are moved from a per-task list to
1250 * the device's request_queue in a batch, this results in improved scalability
1251 * as the lock contention for request_queue lock is reduced.
1253 * It is ok not to disable preemption when adding the request to the plug list
1254 * or when attempting a merge, because blk_schedule_flush_list() will only flush
1255 * the plug list when the task sleeps by itself. For details, please see
1256 * schedule() where blk_schedule_flush_plug() is called.
1259 struct list_head list
; /* requests */
1260 struct list_head mq_list
; /* blk-mq requests */
1261 struct list_head cb_list
; /* md requires an unplug callback */
1263 #define BLK_MAX_REQUEST_COUNT 16
1264 #define BLK_PLUG_FLUSH_SIZE (128 * 1024)
1267 typedef void (*blk_plug_cb_fn
)(struct blk_plug_cb
*, bool);
1268 struct blk_plug_cb
{
1269 struct list_head list
;
1270 blk_plug_cb_fn callback
;
1273 extern struct blk_plug_cb
*blk_check_plugged(blk_plug_cb_fn unplug
,
1274 void *data
, int size
);
1275 extern void blk_start_plug(struct blk_plug
*);
1276 extern void blk_finish_plug(struct blk_plug
*);
1277 extern void blk_flush_plug_list(struct blk_plug
*, bool);
1279 static inline void blk_flush_plug(struct task_struct
*tsk
)
1281 struct blk_plug
*plug
= tsk
->plug
;
1284 blk_flush_plug_list(plug
, false);
1287 static inline void blk_schedule_flush_plug(struct task_struct
*tsk
)
1289 struct blk_plug
*plug
= tsk
->plug
;
1292 blk_flush_plug_list(plug
, true);
1295 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1297 struct blk_plug
*plug
= tsk
->plug
;
1300 (!list_empty(&plug
->list
) ||
1301 !list_empty(&plug
->mq_list
) ||
1302 !list_empty(&plug
->cb_list
));
1308 extern int blk_queue_start_tag(struct request_queue
*, struct request
*);
1309 extern struct request
*blk_queue_find_tag(struct request_queue
*, int);
1310 extern void blk_queue_end_tag(struct request_queue
*, struct request
*);
1311 extern int blk_queue_init_tags(struct request_queue
*, int, struct blk_queue_tag
*, int);
1312 extern void blk_queue_free_tags(struct request_queue
*);
1313 extern int blk_queue_resize_tags(struct request_queue
*, int);
1314 extern void blk_queue_invalidate_tags(struct request_queue
*);
1315 extern struct blk_queue_tag
*blk_init_tags(int, int);
1316 extern void blk_free_tags(struct blk_queue_tag
*);
1318 static inline struct request
*blk_map_queue_find_tag(struct blk_queue_tag
*bqt
,
1321 if (unlikely(bqt
== NULL
|| tag
>= bqt
->real_max_depth
))
1323 return bqt
->tag_index
[tag
];
1326 extern int blkdev_issue_flush(struct block_device
*, gfp_t
, sector_t
*);
1327 extern int blkdev_issue_write_same(struct block_device
*bdev
, sector_t sector
,
1328 sector_t nr_sects
, gfp_t gfp_mask
, struct page
*page
);
1330 #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */
1332 extern int blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1333 sector_t nr_sects
, gfp_t gfp_mask
, unsigned long flags
);
1334 extern int __blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1335 sector_t nr_sects
, gfp_t gfp_mask
, int flags
,
1338 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
1339 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
1341 extern int __blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1342 sector_t nr_sects
, gfp_t gfp_mask
, struct bio
**biop
,
1344 extern int blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1345 sector_t nr_sects
, gfp_t gfp_mask
, unsigned flags
);
1347 static inline int sb_issue_discard(struct super_block
*sb
, sector_t block
,
1348 sector_t nr_blocks
, gfp_t gfp_mask
, unsigned long flags
)
1350 return blkdev_issue_discard(sb
->s_bdev
, block
<< (sb
->s_blocksize_bits
- 9),
1351 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1354 static inline int sb_issue_zeroout(struct super_block
*sb
, sector_t block
,
1355 sector_t nr_blocks
, gfp_t gfp_mask
)
1357 return blkdev_issue_zeroout(sb
->s_bdev
,
1358 block
<< (sb
->s_blocksize_bits
- 9),
1359 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1363 extern int blk_verify_command(unsigned char *cmd
, fmode_t has_write_perm
);
1365 enum blk_default_limits
{
1366 BLK_MAX_SEGMENTS
= 128,
1367 BLK_SAFE_MAX_SECTORS
= 255,
1368 BLK_DEF_MAX_SECTORS
= 2560,
1369 BLK_MAX_SEGMENT_SIZE
= 65536,
1370 BLK_SEG_BOUNDARY_MASK
= 0xFFFFFFFFUL
,
1373 #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
1375 static inline unsigned long queue_bounce_pfn(struct request_queue
*q
)
1377 return q
->limits
.bounce_pfn
;
1380 static inline unsigned long queue_segment_boundary(struct request_queue
*q
)
1382 return q
->limits
.seg_boundary_mask
;
1385 static inline unsigned long queue_virt_boundary(struct request_queue
*q
)
1387 return q
->limits
.virt_boundary_mask
;
1390 static inline unsigned int queue_max_sectors(struct request_queue
*q
)
1392 return q
->limits
.max_sectors
;
1395 static inline unsigned int queue_max_hw_sectors(struct request_queue
*q
)
1397 return q
->limits
.max_hw_sectors
;
1400 static inline unsigned short queue_max_segments(struct request_queue
*q
)
1402 return q
->limits
.max_segments
;
1405 static inline unsigned short queue_max_discard_segments(struct request_queue
*q
)
1407 return q
->limits
.max_discard_segments
;
1410 static inline unsigned int queue_max_segment_size(struct request_queue
*q
)
1412 return q
->limits
.max_segment_size
;
1415 static inline unsigned short queue_logical_block_size(struct request_queue
*q
)
1419 if (q
&& q
->limits
.logical_block_size
)
1420 retval
= q
->limits
.logical_block_size
;
1425 static inline unsigned short bdev_logical_block_size(struct block_device
*bdev
)
1427 return queue_logical_block_size(bdev_get_queue(bdev
));
1430 static inline unsigned int queue_physical_block_size(struct request_queue
*q
)
1432 return q
->limits
.physical_block_size
;
1435 static inline unsigned int bdev_physical_block_size(struct block_device
*bdev
)
1437 return queue_physical_block_size(bdev_get_queue(bdev
));
1440 static inline unsigned int queue_io_min(struct request_queue
*q
)
1442 return q
->limits
.io_min
;
1445 static inline int bdev_io_min(struct block_device
*bdev
)
1447 return queue_io_min(bdev_get_queue(bdev
));
1450 static inline unsigned int queue_io_opt(struct request_queue
*q
)
1452 return q
->limits
.io_opt
;
1455 static inline int bdev_io_opt(struct block_device
*bdev
)
1457 return queue_io_opt(bdev_get_queue(bdev
));
1460 static inline int queue_alignment_offset(struct request_queue
*q
)
1462 if (q
->limits
.misaligned
)
1465 return q
->limits
.alignment_offset
;
1468 static inline int queue_limit_alignment_offset(struct queue_limits
*lim
, sector_t sector
)
1470 unsigned int granularity
= max(lim
->physical_block_size
, lim
->io_min
);
1471 unsigned int alignment
= sector_div(sector
, granularity
>> 9) << 9;
1473 return (granularity
+ lim
->alignment_offset
- alignment
) % granularity
;
1476 static inline int bdev_alignment_offset(struct block_device
*bdev
)
1478 struct request_queue
*q
= bdev_get_queue(bdev
);
1480 if (q
->limits
.misaligned
)
1483 if (bdev
!= bdev
->bd_contains
)
1484 return bdev
->bd_part
->alignment_offset
;
1486 return q
->limits
.alignment_offset
;
1489 static inline int queue_discard_alignment(struct request_queue
*q
)
1491 if (q
->limits
.discard_misaligned
)
1494 return q
->limits
.discard_alignment
;
1497 static inline int queue_limit_discard_alignment(struct queue_limits
*lim
, sector_t sector
)
1499 unsigned int alignment
, granularity
, offset
;
1501 if (!lim
->max_discard_sectors
)
1504 /* Why are these in bytes, not sectors? */
1505 alignment
= lim
->discard_alignment
>> 9;
1506 granularity
= lim
->discard_granularity
>> 9;
1510 /* Offset of the partition start in 'granularity' sectors */
1511 offset
= sector_div(sector
, granularity
);
1513 /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1514 offset
= (granularity
+ alignment
- offset
) % granularity
;
1516 /* Turn it back into bytes, gaah */
1520 static inline int bdev_discard_alignment(struct block_device
*bdev
)
1522 struct request_queue
*q
= bdev_get_queue(bdev
);
1524 if (bdev
!= bdev
->bd_contains
)
1525 return bdev
->bd_part
->discard_alignment
;
1527 return q
->limits
.discard_alignment
;
1530 static inline unsigned int bdev_write_same(struct block_device
*bdev
)
1532 struct request_queue
*q
= bdev_get_queue(bdev
);
1535 return q
->limits
.max_write_same_sectors
;
1540 static inline unsigned int bdev_write_zeroes_sectors(struct block_device
*bdev
)
1542 struct request_queue
*q
= bdev_get_queue(bdev
);
1545 return q
->limits
.max_write_zeroes_sectors
;
1550 static inline enum blk_zoned_model
bdev_zoned_model(struct block_device
*bdev
)
1552 struct request_queue
*q
= bdev_get_queue(bdev
);
1555 return blk_queue_zoned_model(q
);
1557 return BLK_ZONED_NONE
;
1560 static inline bool bdev_is_zoned(struct block_device
*bdev
)
1562 struct request_queue
*q
= bdev_get_queue(bdev
);
1565 return blk_queue_is_zoned(q
);
1570 static inline unsigned int bdev_zone_sectors(struct block_device
*bdev
)
1572 struct request_queue
*q
= bdev_get_queue(bdev
);
1575 return blk_queue_zone_sectors(q
);
1580 static inline int queue_dma_alignment(struct request_queue
*q
)
1582 return q
? q
->dma_alignment
: 511;
1585 static inline int blk_rq_aligned(struct request_queue
*q
, unsigned long addr
,
1588 unsigned int alignment
= queue_dma_alignment(q
) | q
->dma_pad_mask
;
1589 return !(addr
& alignment
) && !(len
& alignment
);
1592 /* assumes size > 256 */
1593 static inline unsigned int blksize_bits(unsigned int size
)
1595 unsigned int bits
= 8;
1599 } while (size
> 256);
1603 static inline unsigned int block_size(struct block_device
*bdev
)
1605 return bdev
->bd_block_size
;
1608 static inline bool queue_flush_queueable(struct request_queue
*q
)
1610 return !test_bit(QUEUE_FLAG_FLUSH_NQ
, &q
->queue_flags
);
1613 typedef struct {struct page
*v
;} Sector
;
1615 unsigned char *read_dev_sector(struct block_device
*, sector_t
, Sector
*);
1617 static inline void put_dev_sector(Sector p
)
1622 static inline bool __bvec_gap_to_prev(struct request_queue
*q
,
1623 struct bio_vec
*bprv
, unsigned int offset
)
1626 ((bprv
->bv_offset
+ bprv
->bv_len
) & queue_virt_boundary(q
));
1630 * Check if adding a bio_vec after bprv with offset would create a gap in
1631 * the SG list. Most drivers don't care about this, but some do.
1633 static inline bool bvec_gap_to_prev(struct request_queue
*q
,
1634 struct bio_vec
*bprv
, unsigned int offset
)
1636 if (!queue_virt_boundary(q
))
1638 return __bvec_gap_to_prev(q
, bprv
, offset
);
1642 * Check if the two bvecs from two bios can be merged to one segment.
1643 * If yes, no need to check gap between the two bios since the 1st bio
1644 * and the 1st bvec in the 2nd bio can be handled in one segment.
1646 static inline bool bios_segs_mergeable(struct request_queue
*q
,
1647 struct bio
*prev
, struct bio_vec
*prev_last_bv
,
1648 struct bio_vec
*next_first_bv
)
1650 if (!BIOVEC_PHYS_MERGEABLE(prev_last_bv
, next_first_bv
))
1652 if (!BIOVEC_SEG_BOUNDARY(q
, prev_last_bv
, next_first_bv
))
1654 if (prev
->bi_seg_back_size
+ next_first_bv
->bv_len
>
1655 queue_max_segment_size(q
))
1660 static inline bool bio_will_gap(struct request_queue
*q
,
1661 struct request
*prev_rq
,
1665 if (bio_has_data(prev
) && queue_virt_boundary(q
)) {
1666 struct bio_vec pb
, nb
;
1669 * don't merge if the 1st bio starts with non-zero
1670 * offset, otherwise it is quite difficult to respect
1671 * sg gap limit. We work hard to merge a huge number of small
1672 * single bios in case of mkfs.
1675 bio_get_first_bvec(prev_rq
->bio
, &pb
);
1677 bio_get_first_bvec(prev
, &pb
);
1682 * We don't need to worry about the situation that the
1683 * merged segment ends in unaligned virt boundary:
1685 * - if 'pb' ends aligned, the merged segment ends aligned
1686 * - if 'pb' ends unaligned, the next bio must include
1687 * one single bvec of 'nb', otherwise the 'nb' can't
1690 bio_get_last_bvec(prev
, &pb
);
1691 bio_get_first_bvec(next
, &nb
);
1693 if (!bios_segs_mergeable(q
, prev
, &pb
, &nb
))
1694 return __bvec_gap_to_prev(q
, &pb
, nb
.bv_offset
);
1700 static inline bool req_gap_back_merge(struct request
*req
, struct bio
*bio
)
1702 return bio_will_gap(req
->q
, req
, req
->biotail
, bio
);
1705 static inline bool req_gap_front_merge(struct request
*req
, struct bio
*bio
)
1707 return bio_will_gap(req
->q
, NULL
, bio
, req
->bio
);
1710 int kblockd_schedule_work(struct work_struct
*work
);
1711 int kblockd_schedule_work_on(int cpu
, struct work_struct
*work
);
1712 int kblockd_schedule_delayed_work(struct delayed_work
*dwork
, unsigned long delay
);
1713 int kblockd_schedule_delayed_work_on(int cpu
, struct delayed_work
*dwork
, unsigned long delay
);
1714 int kblockd_mod_delayed_work_on(int cpu
, struct delayed_work
*dwork
, unsigned long delay
);
1716 #ifdef CONFIG_BLK_CGROUP
1718 * This should not be using sched_clock(). A real patch is in progress
1719 * to fix this up, until that is in place we need to disable preemption
1720 * around sched_clock() in this function and set_io_start_time_ns().
1722 static inline void set_start_time_ns(struct request
*req
)
1725 req
->start_time_ns
= sched_clock();
1729 static inline void set_io_start_time_ns(struct request
*req
)
1732 req
->io_start_time_ns
= sched_clock();
1736 static inline uint64_t rq_start_time_ns(struct request
*req
)
1738 return req
->start_time_ns
;
1741 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1743 return req
->io_start_time_ns
;
1746 static inline void set_start_time_ns(struct request
*req
) {}
1747 static inline void set_io_start_time_ns(struct request
*req
) {}
1748 static inline uint64_t rq_start_time_ns(struct request
*req
)
1752 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1758 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1759 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1760 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1761 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1763 #if defined(CONFIG_BLK_DEV_INTEGRITY)
1765 enum blk_integrity_flags
{
1766 BLK_INTEGRITY_VERIFY
= 1 << 0,
1767 BLK_INTEGRITY_GENERATE
= 1 << 1,
1768 BLK_INTEGRITY_DEVICE_CAPABLE
= 1 << 2,
1769 BLK_INTEGRITY_IP_CHECKSUM
= 1 << 3,
1772 struct blk_integrity_iter
{
1776 unsigned int data_size
;
1777 unsigned short interval
;
1778 const char *disk_name
;
1781 typedef int (integrity_processing_fn
) (struct blk_integrity_iter
*);
1783 struct blk_integrity_profile
{
1784 integrity_processing_fn
*generate_fn
;
1785 integrity_processing_fn
*verify_fn
;
1789 extern void blk_integrity_register(struct gendisk
*, struct blk_integrity
*);
1790 extern void blk_integrity_unregister(struct gendisk
*);
1791 extern int blk_integrity_compare(struct gendisk
*, struct gendisk
*);
1792 extern int blk_rq_map_integrity_sg(struct request_queue
*, struct bio
*,
1793 struct scatterlist
*);
1794 extern int blk_rq_count_integrity_sg(struct request_queue
*, struct bio
*);
1795 extern bool blk_integrity_merge_rq(struct request_queue
*, struct request
*,
1797 extern bool blk_integrity_merge_bio(struct request_queue
*, struct request
*,
1800 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1802 struct blk_integrity
*bi
= &disk
->queue
->integrity
;
1811 struct blk_integrity
*bdev_get_integrity(struct block_device
*bdev
)
1813 return blk_get_integrity(bdev
->bd_disk
);
1816 static inline bool blk_integrity_rq(struct request
*rq
)
1818 return rq
->cmd_flags
& REQ_INTEGRITY
;
1821 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1824 q
->limits
.max_integrity_segments
= segs
;
1827 static inline unsigned short
1828 queue_max_integrity_segments(struct request_queue
*q
)
1830 return q
->limits
.max_integrity_segments
;
1833 static inline bool integrity_req_gap_back_merge(struct request
*req
,
1836 struct bio_integrity_payload
*bip
= bio_integrity(req
->bio
);
1837 struct bio_integrity_payload
*bip_next
= bio_integrity(next
);
1839 return bvec_gap_to_prev(req
->q
, &bip
->bip_vec
[bip
->bip_vcnt
- 1],
1840 bip_next
->bip_vec
[0].bv_offset
);
1843 static inline bool integrity_req_gap_front_merge(struct request
*req
,
1846 struct bio_integrity_payload
*bip
= bio_integrity(bio
);
1847 struct bio_integrity_payload
*bip_next
= bio_integrity(req
->bio
);
1849 return bvec_gap_to_prev(req
->q
, &bip
->bip_vec
[bip
->bip_vcnt
- 1],
1850 bip_next
->bip_vec
[0].bv_offset
);
1853 #else /* CONFIG_BLK_DEV_INTEGRITY */
1856 struct block_device
;
1858 struct blk_integrity
;
1860 static inline int blk_integrity_rq(struct request
*rq
)
1864 static inline int blk_rq_count_integrity_sg(struct request_queue
*q
,
1869 static inline int blk_rq_map_integrity_sg(struct request_queue
*q
,
1871 struct scatterlist
*s
)
1875 static inline struct blk_integrity
*bdev_get_integrity(struct block_device
*b
)
1879 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1883 static inline int blk_integrity_compare(struct gendisk
*a
, struct gendisk
*b
)
1887 static inline void blk_integrity_register(struct gendisk
*d
,
1888 struct blk_integrity
*b
)
1891 static inline void blk_integrity_unregister(struct gendisk
*d
)
1894 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1898 static inline unsigned short queue_max_integrity_segments(struct request_queue
*q
)
1902 static inline bool blk_integrity_merge_rq(struct request_queue
*rq
,
1908 static inline bool blk_integrity_merge_bio(struct request_queue
*rq
,
1915 static inline bool integrity_req_gap_back_merge(struct request
*req
,
1920 static inline bool integrity_req_gap_front_merge(struct request
*req
,
1926 #endif /* CONFIG_BLK_DEV_INTEGRITY */
1928 struct block_device_operations
{
1929 int (*open
) (struct block_device
*, fmode_t
);
1930 void (*release
) (struct gendisk
*, fmode_t
);
1931 int (*rw_page
)(struct block_device
*, sector_t
, struct page
*, bool);
1932 int (*ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1933 int (*compat_ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1934 unsigned int (*check_events
) (struct gendisk
*disk
,
1935 unsigned int clearing
);
1936 /* ->media_changed() is DEPRECATED, use ->check_events() instead */
1937 int (*media_changed
) (struct gendisk
*);
1938 void (*unlock_native_capacity
) (struct gendisk
*);
1939 int (*revalidate_disk
) (struct gendisk
*);
1940 int (*getgeo
)(struct block_device
*, struct hd_geometry
*);
1941 /* this callback is with swap_lock and sometimes page table lock held */
1942 void (*swap_slot_free_notify
) (struct block_device
*, unsigned long);
1943 struct module
*owner
;
1944 const struct pr_ops
*pr_ops
;
1947 extern int __blkdev_driver_ioctl(struct block_device
*, fmode_t
, unsigned int,
1949 extern int bdev_read_page(struct block_device
*, sector_t
, struct page
*);
1950 extern int bdev_write_page(struct block_device
*, sector_t
, struct page
*,
1951 struct writeback_control
*);
1952 #else /* CONFIG_BLOCK */
1954 struct block_device
;
1957 * stubs for when the block layer is configured out
1959 #define buffer_heads_over_limit 0
1961 static inline long nr_blockdev_pages(void)
1969 static inline void blk_start_plug(struct blk_plug
*plug
)
1973 static inline void blk_finish_plug(struct blk_plug
*plug
)
1977 static inline void blk_flush_plug(struct task_struct
*task
)
1981 static inline void blk_schedule_flush_plug(struct task_struct
*task
)
1986 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1991 static inline int blkdev_issue_flush(struct block_device
*bdev
, gfp_t gfp_mask
,
1992 sector_t
*error_sector
)
1997 #endif /* CONFIG_BLOCK */