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
*, blk_status_t
);
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 call_single_data_t 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 short write_hint
;
230 unsigned long deadline
;
231 struct list_head timeout_list
;
234 * completion callback.
236 rq_end_io_fn
*end_io
;
240 struct request
*next_rq
;
243 static inline bool blk_rq_is_scsi(struct request
*rq
)
245 return req_op(rq
) == REQ_OP_SCSI_IN
|| req_op(rq
) == REQ_OP_SCSI_OUT
;
248 static inline bool blk_rq_is_private(struct request
*rq
)
250 return req_op(rq
) == REQ_OP_DRV_IN
|| req_op(rq
) == REQ_OP_DRV_OUT
;
253 static inline bool blk_rq_is_passthrough(struct request
*rq
)
255 return blk_rq_is_scsi(rq
) || blk_rq_is_private(rq
);
258 static inline unsigned short req_get_ioprio(struct request
*req
)
263 #include <linux/elevator.h>
265 struct blk_queue_ctx
;
267 typedef void (request_fn_proc
) (struct request_queue
*q
);
268 typedef blk_qc_t (make_request_fn
) (struct request_queue
*q
, struct bio
*bio
);
269 typedef int (prep_rq_fn
) (struct request_queue
*, struct request
*);
270 typedef void (unprep_rq_fn
) (struct request_queue
*, struct request
*);
273 typedef void (softirq_done_fn
)(struct request
*);
274 typedef int (dma_drain_needed_fn
)(struct request
*);
275 typedef int (lld_busy_fn
) (struct request_queue
*q
);
276 typedef int (bsg_job_fn
) (struct bsg_job
*);
277 typedef int (init_rq_fn
)(struct request_queue
*, struct request
*, gfp_t
);
278 typedef void (exit_rq_fn
)(struct request_queue
*, struct request
*);
280 enum blk_eh_timer_return
{
286 typedef enum blk_eh_timer_return (rq_timed_out_fn
)(struct request
*);
288 enum blk_queue_state
{
293 struct blk_queue_tag
{
294 struct request
**tag_index
; /* map of busy tags */
295 unsigned long *tag_map
; /* bit map of free/busy tags */
296 int max_depth
; /* what we will send to device */
297 int real_max_depth
; /* what the array can hold */
298 atomic_t refcnt
; /* map can be shared */
299 int alloc_policy
; /* tag allocation policy */
300 int next_tag
; /* next tag */
302 #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */
303 #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */
305 #define BLK_SCSI_MAX_CMDS (256)
306 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
309 * Zoned block device models (zoned limit).
311 enum blk_zoned_model
{
312 BLK_ZONED_NONE
, /* Regular block device */
313 BLK_ZONED_HA
, /* Host-aware zoned block device */
314 BLK_ZONED_HM
, /* Host-managed zoned block device */
317 struct queue_limits
{
318 unsigned long bounce_pfn
;
319 unsigned long seg_boundary_mask
;
320 unsigned long virt_boundary_mask
;
322 unsigned int max_hw_sectors
;
323 unsigned int max_dev_sectors
;
324 unsigned int chunk_sectors
;
325 unsigned int max_sectors
;
326 unsigned int max_segment_size
;
327 unsigned int physical_block_size
;
328 unsigned int alignment_offset
;
331 unsigned int max_discard_sectors
;
332 unsigned int max_hw_discard_sectors
;
333 unsigned int max_write_same_sectors
;
334 unsigned int max_write_zeroes_sectors
;
335 unsigned int discard_granularity
;
336 unsigned int discard_alignment
;
338 unsigned short logical_block_size
;
339 unsigned short max_segments
;
340 unsigned short max_integrity_segments
;
341 unsigned short max_discard_segments
;
343 unsigned char misaligned
;
344 unsigned char discard_misaligned
;
345 unsigned char cluster
;
346 unsigned char raid_partial_stripes_expensive
;
347 enum blk_zoned_model zoned
;
350 #ifdef CONFIG_BLK_DEV_ZONED
352 struct blk_zone_report_hdr
{
353 unsigned int nr_zones
;
357 extern int blkdev_report_zones(struct block_device
*bdev
,
358 sector_t sector
, struct blk_zone
*zones
,
359 unsigned int *nr_zones
, gfp_t gfp_mask
);
360 extern int blkdev_reset_zones(struct block_device
*bdev
, sector_t sectors
,
361 sector_t nr_sectors
, gfp_t gfp_mask
);
363 extern int blkdev_report_zones_ioctl(struct block_device
*bdev
, fmode_t mode
,
364 unsigned int cmd
, unsigned long arg
);
365 extern int blkdev_reset_zones_ioctl(struct block_device
*bdev
, fmode_t mode
,
366 unsigned int cmd
, unsigned long arg
);
368 #else /* CONFIG_BLK_DEV_ZONED */
370 static inline int blkdev_report_zones_ioctl(struct block_device
*bdev
,
371 fmode_t mode
, unsigned int cmd
,
377 static inline int blkdev_reset_zones_ioctl(struct block_device
*bdev
,
378 fmode_t mode
, unsigned int cmd
,
384 #endif /* CONFIG_BLK_DEV_ZONED */
386 struct request_queue
{
388 * Together with queue_head for cacheline sharing
390 struct list_head queue_head
;
391 struct request
*last_merge
;
392 struct elevator_queue
*elevator
;
393 int nr_rqs
[2]; /* # allocated [a]sync rqs */
394 int nr_rqs_elvpriv
; /* # allocated rqs w/ elvpriv */
396 atomic_t shared_hctx_restart
;
398 struct blk_queue_stats
*stats
;
402 * If blkcg is not used, @q->root_rl serves all requests. If blkcg
403 * is used, root blkg allocates from @q->root_rl and all other
404 * blkgs from their own blkg->rl. Which one to use should be
405 * determined using bio_request_list().
407 struct request_list root_rl
;
409 request_fn_proc
*request_fn
;
410 make_request_fn
*make_request_fn
;
411 prep_rq_fn
*prep_rq_fn
;
412 unprep_rq_fn
*unprep_rq_fn
;
413 softirq_done_fn
*softirq_done_fn
;
414 rq_timed_out_fn
*rq_timed_out_fn
;
415 dma_drain_needed_fn
*dma_drain_needed
;
416 lld_busy_fn
*lld_busy_fn
;
417 /* Called just after a request is allocated */
418 init_rq_fn
*init_rq_fn
;
419 /* Called just before a request is freed */
420 exit_rq_fn
*exit_rq_fn
;
421 /* Called from inside blk_get_request() */
422 void (*initialize_rq_fn
)(struct request
*rq
);
424 const struct blk_mq_ops
*mq_ops
;
426 unsigned int *mq_map
;
429 struct blk_mq_ctx __percpu
*queue_ctx
;
430 unsigned int nr_queues
;
432 unsigned int queue_depth
;
434 /* hw dispatch queues */
435 struct blk_mq_hw_ctx
**queue_hw_ctx
;
436 unsigned int nr_hw_queues
;
439 * Dispatch queue sorting
442 struct request
*boundary_rq
;
445 * Delayed queue handling
447 struct delayed_work delay_work
;
449 struct backing_dev_info
*backing_dev_info
;
452 * The queue owner gets to use this for whatever they like.
453 * ll_rw_blk doesn't touch it.
458 * various queue flags, see QUEUE_* below
460 unsigned long queue_flags
;
463 * ida allocated id for this queue. Used to index queues from
469 * queue needs bounce pages for pages above this limit
474 * protects queue structures from reentrancy. ->__queue_lock should
475 * _never_ be used directly, it is queue private. always use
478 spinlock_t __queue_lock
;
479 spinlock_t
*queue_lock
;
489 struct kobject mq_kobj
;
491 #ifdef CONFIG_BLK_DEV_INTEGRITY
492 struct blk_integrity integrity
;
493 #endif /* CONFIG_BLK_DEV_INTEGRITY */
498 unsigned int nr_pending
;
504 unsigned long nr_requests
; /* Max # of requests */
505 unsigned int nr_congestion_on
;
506 unsigned int nr_congestion_off
;
507 unsigned int nr_batching
;
509 unsigned int dma_drain_size
;
510 void *dma_drain_buffer
;
511 unsigned int dma_pad_mask
;
512 unsigned int dma_alignment
;
514 struct blk_queue_tag
*queue_tags
;
515 struct list_head tag_busy_list
;
517 unsigned int nr_sorted
;
518 unsigned int in_flight
[2];
521 * Number of active block driver functions for which blk_drain_queue()
522 * must wait. Must be incremented around functions that unlock the
523 * queue_lock internally, e.g. scsi_request_fn().
525 unsigned int request_fn_active
;
527 unsigned int rq_timeout
;
530 struct blk_stat_callback
*poll_cb
;
531 struct blk_rq_stat poll_stat
[BLK_MQ_POLL_STATS_BKTS
];
533 struct timer_list timeout
;
534 struct work_struct timeout_work
;
535 struct list_head timeout_list
;
537 struct list_head icq_list
;
538 #ifdef CONFIG_BLK_CGROUP
539 DECLARE_BITMAP (blkcg_pols
, BLKCG_MAX_POLS
);
540 struct blkcg_gq
*root_blkg
;
541 struct list_head blkg_list
;
544 struct queue_limits limits
;
549 unsigned int sg_timeout
;
550 unsigned int sg_reserved_size
;
552 #ifdef CONFIG_BLK_DEV_IO_TRACE
553 struct blk_trace
*blk_trace
;
554 struct mutex blk_trace_mutex
;
557 * for flush operations
559 struct blk_flush_queue
*fq
;
561 struct list_head requeue_list
;
562 spinlock_t requeue_lock
;
563 struct delayed_work requeue_work
;
565 struct mutex sysfs_lock
;
568 atomic_t mq_freeze_depth
;
570 #if defined(CONFIG_BLK_DEV_BSG)
571 bsg_job_fn
*bsg_job_fn
;
572 struct bsg_class_device bsg_dev
;
575 #ifdef CONFIG_BLK_DEV_THROTTLING
577 struct throtl_data
*td
;
579 struct rcu_head rcu_head
;
580 wait_queue_head_t mq_freeze_wq
;
581 struct percpu_ref q_usage_counter
;
582 struct list_head all_q_node
;
584 struct blk_mq_tag_set
*tag_set
;
585 struct list_head tag_set_list
;
586 struct bio_set
*bio_split
;
588 #ifdef CONFIG_BLK_DEBUG_FS
589 struct dentry
*debugfs_dir
;
590 struct dentry
*sched_debugfs_dir
;
593 bool mq_sysfs_init_done
;
598 struct work_struct release_work
;
600 #define BLK_MAX_WRITE_HINTS 5
601 u64 write_hints
[BLK_MAX_WRITE_HINTS
];
604 #define QUEUE_FLAG_QUEUED 0 /* uses generic tag queueing */
605 #define QUEUE_FLAG_STOPPED 1 /* queue is stopped */
606 #define QUEUE_FLAG_DYING 2 /* queue being torn down */
607 #define QUEUE_FLAG_BYPASS 3 /* act as dumb FIFO queue */
608 #define QUEUE_FLAG_BIDI 4 /* queue supports bidi requests */
609 #define QUEUE_FLAG_NOMERGES 5 /* disable merge attempts */
610 #define QUEUE_FLAG_SAME_COMP 6 /* complete on same CPU-group */
611 #define QUEUE_FLAG_FAIL_IO 7 /* fake timeout */
612 #define QUEUE_FLAG_STACKABLE 8 /* supports request stacking */
613 #define QUEUE_FLAG_NONROT 9 /* non-rotational device (SSD) */
614 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
615 #define QUEUE_FLAG_IO_STAT 10 /* do IO stats */
616 #define QUEUE_FLAG_DISCARD 11 /* supports DISCARD */
617 #define QUEUE_FLAG_NOXMERGES 12 /* No extended merges */
618 #define QUEUE_FLAG_ADD_RANDOM 13 /* Contributes to random pool */
619 #define QUEUE_FLAG_SECERASE 14 /* supports secure erase */
620 #define QUEUE_FLAG_SAME_FORCE 15 /* force complete on same CPU */
621 #define QUEUE_FLAG_DEAD 16 /* queue tear-down finished */
622 #define QUEUE_FLAG_INIT_DONE 17 /* queue is initialized */
623 #define QUEUE_FLAG_NO_SG_MERGE 18 /* don't attempt to merge SG segments*/
624 #define QUEUE_FLAG_POLL 19 /* IO polling enabled if set */
625 #define QUEUE_FLAG_WC 20 /* Write back caching */
626 #define QUEUE_FLAG_FUA 21 /* device supports FUA writes */
627 #define QUEUE_FLAG_FLUSH_NQ 22 /* flush not queueuable */
628 #define QUEUE_FLAG_DAX 23 /* device supports DAX */
629 #define QUEUE_FLAG_STATS 24 /* track rq completion times */
630 #define QUEUE_FLAG_POLL_STATS 25 /* collecting stats for hybrid polling */
631 #define QUEUE_FLAG_REGISTERED 26 /* queue has been registered to a disk */
632 #define QUEUE_FLAG_SCSI_PASSTHROUGH 27 /* queue supports SCSI commands */
633 #define QUEUE_FLAG_QUIESCED 28 /* queue has been quiesced */
635 #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
636 (1 << QUEUE_FLAG_STACKABLE) | \
637 (1 << QUEUE_FLAG_SAME_COMP) | \
638 (1 << QUEUE_FLAG_ADD_RANDOM))
640 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
641 (1 << QUEUE_FLAG_STACKABLE) | \
642 (1 << QUEUE_FLAG_SAME_COMP) | \
643 (1 << QUEUE_FLAG_POLL))
646 * @q->queue_lock is set while a queue is being initialized. Since we know
647 * that no other threads access the queue object before @q->queue_lock has
648 * been set, it is safe to manipulate queue flags without holding the
649 * queue_lock if @q->queue_lock == NULL. See also blk_alloc_queue_node() and
650 * blk_init_allocated_queue().
652 static inline void queue_lockdep_assert_held(struct request_queue
*q
)
655 lockdep_assert_held(q
->queue_lock
);
658 static inline void queue_flag_set_unlocked(unsigned int flag
,
659 struct request_queue
*q
)
661 __set_bit(flag
, &q
->queue_flags
);
664 static inline int queue_flag_test_and_clear(unsigned int flag
,
665 struct request_queue
*q
)
667 queue_lockdep_assert_held(q
);
669 if (test_bit(flag
, &q
->queue_flags
)) {
670 __clear_bit(flag
, &q
->queue_flags
);
677 static inline int queue_flag_test_and_set(unsigned int flag
,
678 struct request_queue
*q
)
680 queue_lockdep_assert_held(q
);
682 if (!test_bit(flag
, &q
->queue_flags
)) {
683 __set_bit(flag
, &q
->queue_flags
);
690 static inline void queue_flag_set(unsigned int flag
, struct request_queue
*q
)
692 queue_lockdep_assert_held(q
);
693 __set_bit(flag
, &q
->queue_flags
);
696 static inline void queue_flag_clear_unlocked(unsigned int flag
,
697 struct request_queue
*q
)
699 __clear_bit(flag
, &q
->queue_flags
);
702 static inline int queue_in_flight(struct request_queue
*q
)
704 return q
->in_flight
[0] + q
->in_flight
[1];
707 static inline void queue_flag_clear(unsigned int flag
, struct request_queue
*q
)
709 queue_lockdep_assert_held(q
);
710 __clear_bit(flag
, &q
->queue_flags
);
713 #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
714 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
715 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
716 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
717 #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags)
718 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
719 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
720 #define blk_queue_noxmerges(q) \
721 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
722 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
723 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
724 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
725 #define blk_queue_stackable(q) \
726 test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
727 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
728 #define blk_queue_secure_erase(q) \
729 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
730 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
731 #define blk_queue_scsi_passthrough(q) \
732 test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags)
734 #define blk_noretry_request(rq) \
735 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
736 REQ_FAILFAST_DRIVER))
737 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
739 static inline bool blk_account_rq(struct request
*rq
)
741 return (rq
->rq_flags
& RQF_STARTED
) && !blk_rq_is_passthrough(rq
);
744 #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
745 #define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
746 /* rq->queuelist of dequeued request must be list_empty() */
747 #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
749 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
751 #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ)
754 * Driver can handle struct request, if it either has an old style
755 * request_fn defined, or is blk-mq based.
757 static inline bool queue_is_rq_based(struct request_queue
*q
)
759 return q
->request_fn
|| q
->mq_ops
;
762 static inline unsigned int blk_queue_cluster(struct request_queue
*q
)
764 return q
->limits
.cluster
;
767 static inline enum blk_zoned_model
768 blk_queue_zoned_model(struct request_queue
*q
)
770 return q
->limits
.zoned
;
773 static inline bool blk_queue_is_zoned(struct request_queue
*q
)
775 switch (blk_queue_zoned_model(q
)) {
784 static inline unsigned int blk_queue_zone_sectors(struct request_queue
*q
)
786 return blk_queue_is_zoned(q
) ? q
->limits
.chunk_sectors
: 0;
789 static inline bool rq_is_sync(struct request
*rq
)
791 return op_is_sync(rq
->cmd_flags
);
794 static inline bool blk_rl_full(struct request_list
*rl
, bool sync
)
796 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
798 return rl
->flags
& flag
;
801 static inline void blk_set_rl_full(struct request_list
*rl
, bool sync
)
803 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
808 static inline void blk_clear_rl_full(struct request_list
*rl
, bool sync
)
810 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
815 static inline bool rq_mergeable(struct request
*rq
)
817 if (blk_rq_is_passthrough(rq
))
820 if (req_op(rq
) == REQ_OP_FLUSH
)
823 if (req_op(rq
) == REQ_OP_WRITE_ZEROES
)
826 if (rq
->cmd_flags
& REQ_NOMERGE_FLAGS
)
828 if (rq
->rq_flags
& RQF_NOMERGE_FLAGS
)
834 static inline bool blk_write_same_mergeable(struct bio
*a
, struct bio
*b
)
836 if (bio_page(a
) == bio_page(b
) &&
837 bio_offset(a
) == bio_offset(b
))
843 static inline unsigned int blk_queue_depth(struct request_queue
*q
)
846 return q
->queue_depth
;
848 return q
->nr_requests
;
852 * q->prep_rq_fn return values
855 BLKPREP_OK
, /* serve it */
856 BLKPREP_KILL
, /* fatal error, kill, return -EIO */
857 BLKPREP_DEFER
, /* leave on queue */
858 BLKPREP_INVALID
, /* invalid command, kill, return -EREMOTEIO */
861 extern unsigned long blk_max_low_pfn
, blk_max_pfn
;
864 * standard bounce addresses:
866 * BLK_BOUNCE_HIGH : bounce all highmem pages
867 * BLK_BOUNCE_ANY : don't bounce anything
868 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
871 #if BITS_PER_LONG == 32
872 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
874 #define BLK_BOUNCE_HIGH -1ULL
876 #define BLK_BOUNCE_ANY (-1ULL)
877 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
880 * default timeout for SG_IO if none specified
882 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
883 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
889 unsigned long offset
;
894 struct req_iterator
{
895 struct bvec_iter iter
;
899 /* This should not be used directly - use rq_for_each_segment */
900 #define for_each_bio(_bio) \
901 for (; _bio; _bio = _bio->bi_next)
902 #define __rq_for_each_bio(_bio, rq) \
904 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
906 #define rq_for_each_segment(bvl, _rq, _iter) \
907 __rq_for_each_bio(_iter.bio, _rq) \
908 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
910 #define rq_iter_last(bvec, _iter) \
911 (_iter.bio->bi_next == NULL && \
912 bio_iter_last(bvec, _iter.iter))
914 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
915 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
917 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
918 extern void rq_flush_dcache_pages(struct request
*rq
);
920 static inline void rq_flush_dcache_pages(struct request
*rq
)
926 #define vfs_msg(sb, level, fmt, ...) \
927 __vfs_msg(sb, level, fmt, ##__VA_ARGS__)
929 #define vfs_msg(sb, level, fmt, ...) \
931 no_printk(fmt, ##__VA_ARGS__); \
932 __vfs_msg(sb, "", " "); \
936 extern int blk_register_queue(struct gendisk
*disk
);
937 extern void blk_unregister_queue(struct gendisk
*disk
);
938 extern blk_qc_t
generic_make_request(struct bio
*bio
);
939 extern void blk_rq_init(struct request_queue
*q
, struct request
*rq
);
940 extern void blk_init_request_from_bio(struct request
*req
, struct bio
*bio
);
941 extern void blk_put_request(struct request
*);
942 extern void __blk_put_request(struct request_queue
*, struct request
*);
943 extern struct request
*blk_get_request(struct request_queue
*, unsigned int op
,
945 extern void blk_requeue_request(struct request_queue
*, struct request
*);
946 extern int blk_lld_busy(struct request_queue
*q
);
947 extern int blk_rq_prep_clone(struct request
*rq
, struct request
*rq_src
,
948 struct bio_set
*bs
, gfp_t gfp_mask
,
949 int (*bio_ctr
)(struct bio
*, struct bio
*, void *),
951 extern void blk_rq_unprep_clone(struct request
*rq
);
952 extern blk_status_t
blk_insert_cloned_request(struct request_queue
*q
,
954 extern int blk_rq_append_bio(struct request
*rq
, struct bio
*bio
);
955 extern void blk_delay_queue(struct request_queue
*, unsigned long);
956 extern void blk_queue_split(struct request_queue
*, struct bio
**);
957 extern void blk_recount_segments(struct request_queue
*, struct bio
*);
958 extern int scsi_verify_blk_ioctl(struct block_device
*, unsigned int);
959 extern int scsi_cmd_blk_ioctl(struct block_device
*, fmode_t
,
960 unsigned int, void __user
*);
961 extern int scsi_cmd_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
962 unsigned int, void __user
*);
963 extern int sg_scsi_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
964 struct scsi_ioctl_command __user
*);
966 extern int blk_queue_enter(struct request_queue
*q
, bool nowait
);
967 extern void blk_queue_exit(struct request_queue
*q
);
968 extern void blk_start_queue(struct request_queue
*q
);
969 extern void blk_start_queue_async(struct request_queue
*q
);
970 extern void blk_stop_queue(struct request_queue
*q
);
971 extern void blk_sync_queue(struct request_queue
*q
);
972 extern void __blk_stop_queue(struct request_queue
*q
);
973 extern void __blk_run_queue(struct request_queue
*q
);
974 extern void __blk_run_queue_uncond(struct request_queue
*q
);
975 extern void blk_run_queue(struct request_queue
*);
976 extern void blk_run_queue_async(struct request_queue
*q
);
977 extern int blk_rq_map_user(struct request_queue
*, struct request
*,
978 struct rq_map_data
*, void __user
*, unsigned long,
980 extern int blk_rq_unmap_user(struct bio
*);
981 extern int blk_rq_map_kern(struct request_queue
*, struct request
*, void *, unsigned int, gfp_t
);
982 extern int blk_rq_map_user_iov(struct request_queue
*, struct request
*,
983 struct rq_map_data
*, const struct iov_iter
*,
985 extern void blk_execute_rq(struct request_queue
*, struct gendisk
*,
986 struct request
*, int);
987 extern void blk_execute_rq_nowait(struct request_queue
*, struct gendisk
*,
988 struct request
*, int, rq_end_io_fn
*);
990 int blk_status_to_errno(blk_status_t status
);
991 blk_status_t
errno_to_blk_status(int errno
);
993 bool blk_mq_poll(struct request_queue
*q
, blk_qc_t cookie
);
995 static inline struct request_queue
*bdev_get_queue(struct block_device
*bdev
)
997 return bdev
->bd_disk
->queue
; /* this is never NULL */
1001 * blk_rq_pos() : the current sector
1002 * blk_rq_bytes() : bytes left in the entire request
1003 * blk_rq_cur_bytes() : bytes left in the current segment
1004 * blk_rq_err_bytes() : bytes left till the next error boundary
1005 * blk_rq_sectors() : sectors left in the entire request
1006 * blk_rq_cur_sectors() : sectors left in the current segment
1008 static inline sector_t
blk_rq_pos(const struct request
*rq
)
1010 return rq
->__sector
;
1013 static inline unsigned int blk_rq_bytes(const struct request
*rq
)
1015 return rq
->__data_len
;
1018 static inline int blk_rq_cur_bytes(const struct request
*rq
)
1020 return rq
->bio
? bio_cur_bytes(rq
->bio
) : 0;
1023 extern unsigned int blk_rq_err_bytes(const struct request
*rq
);
1025 static inline unsigned int blk_rq_sectors(const struct request
*rq
)
1027 return blk_rq_bytes(rq
) >> 9;
1030 static inline unsigned int blk_rq_cur_sectors(const struct request
*rq
)
1032 return blk_rq_cur_bytes(rq
) >> 9;
1036 * Some commands like WRITE SAME have a payload or data transfer size which
1037 * is different from the size of the request. Any driver that supports such
1038 * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to
1039 * calculate the data transfer size.
1041 static inline unsigned int blk_rq_payload_bytes(struct request
*rq
)
1043 if (rq
->rq_flags
& RQF_SPECIAL_PAYLOAD
)
1044 return rq
->special_vec
.bv_len
;
1045 return blk_rq_bytes(rq
);
1048 static inline unsigned int blk_queue_get_max_sectors(struct request_queue
*q
,
1051 if (unlikely(op
== REQ_OP_DISCARD
|| op
== REQ_OP_SECURE_ERASE
))
1052 return min(q
->limits
.max_discard_sectors
, UINT_MAX
>> 9);
1054 if (unlikely(op
== REQ_OP_WRITE_SAME
))
1055 return q
->limits
.max_write_same_sectors
;
1057 if (unlikely(op
== REQ_OP_WRITE_ZEROES
))
1058 return q
->limits
.max_write_zeroes_sectors
;
1060 return q
->limits
.max_sectors
;
1064 * Return maximum size of a request at given offset. Only valid for
1065 * file system requests.
1067 static inline unsigned int blk_max_size_offset(struct request_queue
*q
,
1070 if (!q
->limits
.chunk_sectors
)
1071 return q
->limits
.max_sectors
;
1073 return q
->limits
.chunk_sectors
-
1074 (offset
& (q
->limits
.chunk_sectors
- 1));
1077 static inline unsigned int blk_rq_get_max_sectors(struct request
*rq
,
1080 struct request_queue
*q
= rq
->q
;
1082 if (blk_rq_is_passthrough(rq
))
1083 return q
->limits
.max_hw_sectors
;
1085 if (!q
->limits
.chunk_sectors
||
1086 req_op(rq
) == REQ_OP_DISCARD
||
1087 req_op(rq
) == REQ_OP_SECURE_ERASE
)
1088 return blk_queue_get_max_sectors(q
, req_op(rq
));
1090 return min(blk_max_size_offset(q
, offset
),
1091 blk_queue_get_max_sectors(q
, req_op(rq
)));
1094 static inline unsigned int blk_rq_count_bios(struct request
*rq
)
1096 unsigned int nr_bios
= 0;
1099 __rq_for_each_bio(bio
, rq
)
1106 * Request issue related functions.
1108 extern struct request
*blk_peek_request(struct request_queue
*q
);
1109 extern void blk_start_request(struct request
*rq
);
1110 extern struct request
*blk_fetch_request(struct request_queue
*q
);
1113 * Request completion related functions.
1115 * blk_update_request() completes given number of bytes and updates
1116 * the request without completing it.
1118 * blk_end_request() and friends. __blk_end_request() must be called
1119 * with the request queue spinlock acquired.
1121 * Several drivers define their own end_request and call
1122 * blk_end_request() for parts of the original function.
1123 * This prevents code duplication in drivers.
1125 extern bool blk_update_request(struct request
*rq
, blk_status_t error
,
1126 unsigned int nr_bytes
);
1127 extern void blk_finish_request(struct request
*rq
, blk_status_t error
);
1128 extern bool blk_end_request(struct request
*rq
, blk_status_t error
,
1129 unsigned int nr_bytes
);
1130 extern void blk_end_request_all(struct request
*rq
, blk_status_t error
);
1131 extern bool __blk_end_request(struct request
*rq
, blk_status_t error
,
1132 unsigned int nr_bytes
);
1133 extern void __blk_end_request_all(struct request
*rq
, blk_status_t error
);
1134 extern bool __blk_end_request_cur(struct request
*rq
, blk_status_t error
);
1136 extern void blk_complete_request(struct request
*);
1137 extern void __blk_complete_request(struct request
*);
1138 extern void blk_abort_request(struct request
*);
1139 extern void blk_unprep_request(struct request
*);
1142 * Access functions for manipulating queue properties
1144 extern struct request_queue
*blk_init_queue_node(request_fn_proc
*rfn
,
1145 spinlock_t
*lock
, int node_id
);
1146 extern struct request_queue
*blk_init_queue(request_fn_proc
*, spinlock_t
*);
1147 extern int blk_init_allocated_queue(struct request_queue
*);
1148 extern void blk_cleanup_queue(struct request_queue
*);
1149 extern void blk_queue_make_request(struct request_queue
*, make_request_fn
*);
1150 extern void blk_queue_bounce_limit(struct request_queue
*, u64
);
1151 extern void blk_queue_max_hw_sectors(struct request_queue
*, unsigned int);
1152 extern void blk_queue_chunk_sectors(struct request_queue
*, unsigned int);
1153 extern void blk_queue_max_segments(struct request_queue
*, unsigned short);
1154 extern void blk_queue_max_discard_segments(struct request_queue
*,
1156 extern void blk_queue_max_segment_size(struct request_queue
*, unsigned int);
1157 extern void blk_queue_max_discard_sectors(struct request_queue
*q
,
1158 unsigned int max_discard_sectors
);
1159 extern void blk_queue_max_write_same_sectors(struct request_queue
*q
,
1160 unsigned int max_write_same_sectors
);
1161 extern void blk_queue_max_write_zeroes_sectors(struct request_queue
*q
,
1162 unsigned int max_write_same_sectors
);
1163 extern void blk_queue_logical_block_size(struct request_queue
*, unsigned short);
1164 extern void blk_queue_physical_block_size(struct request_queue
*, unsigned int);
1165 extern void blk_queue_alignment_offset(struct request_queue
*q
,
1166 unsigned int alignment
);
1167 extern void blk_limits_io_min(struct queue_limits
*limits
, unsigned int min
);
1168 extern void blk_queue_io_min(struct request_queue
*q
, unsigned int min
);
1169 extern void blk_limits_io_opt(struct queue_limits
*limits
, unsigned int opt
);
1170 extern void blk_queue_io_opt(struct request_queue
*q
, unsigned int opt
);
1171 extern void blk_set_queue_depth(struct request_queue
*q
, unsigned int depth
);
1172 extern void blk_set_default_limits(struct queue_limits
*lim
);
1173 extern void blk_set_stacking_limits(struct queue_limits
*lim
);
1174 extern int blk_stack_limits(struct queue_limits
*t
, struct queue_limits
*b
,
1176 extern int bdev_stack_limits(struct queue_limits
*t
, struct block_device
*bdev
,
1178 extern void disk_stack_limits(struct gendisk
*disk
, struct block_device
*bdev
,
1180 extern void blk_queue_stack_limits(struct request_queue
*t
, struct request_queue
*b
);
1181 extern void blk_queue_dma_pad(struct request_queue
*, unsigned int);
1182 extern void blk_queue_update_dma_pad(struct request_queue
*, unsigned int);
1183 extern int blk_queue_dma_drain(struct request_queue
*q
,
1184 dma_drain_needed_fn
*dma_drain_needed
,
1185 void *buf
, unsigned int size
);
1186 extern void blk_queue_lld_busy(struct request_queue
*q
, lld_busy_fn
*fn
);
1187 extern void blk_queue_segment_boundary(struct request_queue
*, unsigned long);
1188 extern void blk_queue_virt_boundary(struct request_queue
*, unsigned long);
1189 extern void blk_queue_prep_rq(struct request_queue
*, prep_rq_fn
*pfn
);
1190 extern void blk_queue_unprep_rq(struct request_queue
*, unprep_rq_fn
*ufn
);
1191 extern void blk_queue_dma_alignment(struct request_queue
*, int);
1192 extern void blk_queue_update_dma_alignment(struct request_queue
*, int);
1193 extern void blk_queue_softirq_done(struct request_queue
*, softirq_done_fn
*);
1194 extern void blk_queue_rq_timed_out(struct request_queue
*, rq_timed_out_fn
*);
1195 extern void blk_queue_rq_timeout(struct request_queue
*, unsigned int);
1196 extern void blk_queue_flush_queueable(struct request_queue
*q
, bool queueable
);
1197 extern void blk_queue_write_cache(struct request_queue
*q
, bool enabled
, bool fua
);
1200 * Number of physical segments as sent to the device.
1202 * Normally this is the number of discontiguous data segments sent by the
1203 * submitter. But for data-less command like discard we might have no
1204 * actual data segments submitted, but the driver might have to add it's
1205 * own special payload. In that case we still return 1 here so that this
1206 * special payload will be mapped.
1208 static inline unsigned short blk_rq_nr_phys_segments(struct request
*rq
)
1210 if (rq
->rq_flags
& RQF_SPECIAL_PAYLOAD
)
1212 return rq
->nr_phys_segments
;
1216 * Number of discard segments (or ranges) the driver needs to fill in.
1217 * Each discard bio merged into a request is counted as one segment.
1219 static inline unsigned short blk_rq_nr_discard_segments(struct request
*rq
)
1221 return max_t(unsigned short, rq
->nr_phys_segments
, 1);
1224 extern int blk_rq_map_sg(struct request_queue
*, struct request
*, struct scatterlist
*);
1225 extern void blk_dump_rq_flags(struct request
*, char *);
1226 extern long nr_blockdev_pages(void);
1228 bool __must_check
blk_get_queue(struct request_queue
*);
1229 struct request_queue
*blk_alloc_queue(gfp_t
);
1230 struct request_queue
*blk_alloc_queue_node(gfp_t
, int);
1231 extern void blk_put_queue(struct request_queue
*);
1232 extern void blk_set_queue_dying(struct request_queue
*);
1235 * block layer runtime pm functions
1238 extern void blk_pm_runtime_init(struct request_queue
*q
, struct device
*dev
);
1239 extern int blk_pre_runtime_suspend(struct request_queue
*q
);
1240 extern void blk_post_runtime_suspend(struct request_queue
*q
, int err
);
1241 extern void blk_pre_runtime_resume(struct request_queue
*q
);
1242 extern void blk_post_runtime_resume(struct request_queue
*q
, int err
);
1243 extern void blk_set_runtime_active(struct request_queue
*q
);
1245 static inline void blk_pm_runtime_init(struct request_queue
*q
,
1246 struct device
*dev
) {}
1247 static inline int blk_pre_runtime_suspend(struct request_queue
*q
)
1251 static inline void blk_post_runtime_suspend(struct request_queue
*q
, int err
) {}
1252 static inline void blk_pre_runtime_resume(struct request_queue
*q
) {}
1253 static inline void blk_post_runtime_resume(struct request_queue
*q
, int err
) {}
1254 static inline void blk_set_runtime_active(struct request_queue
*q
) {}
1258 * blk_plug permits building a queue of related requests by holding the I/O
1259 * fragments for a short period. This allows merging of sequential requests
1260 * into single larger request. As the requests are moved from a per-task list to
1261 * the device's request_queue in a batch, this results in improved scalability
1262 * as the lock contention for request_queue lock is reduced.
1264 * It is ok not to disable preemption when adding the request to the plug list
1265 * or when attempting a merge, because blk_schedule_flush_list() will only flush
1266 * the plug list when the task sleeps by itself. For details, please see
1267 * schedule() where blk_schedule_flush_plug() is called.
1270 struct list_head list
; /* requests */
1271 struct list_head mq_list
; /* blk-mq requests */
1272 struct list_head cb_list
; /* md requires an unplug callback */
1274 #define BLK_MAX_REQUEST_COUNT 16
1275 #define BLK_PLUG_FLUSH_SIZE (128 * 1024)
1278 typedef void (*blk_plug_cb_fn
)(struct blk_plug_cb
*, bool);
1279 struct blk_plug_cb
{
1280 struct list_head list
;
1281 blk_plug_cb_fn callback
;
1284 extern struct blk_plug_cb
*blk_check_plugged(blk_plug_cb_fn unplug
,
1285 void *data
, int size
);
1286 extern void blk_start_plug(struct blk_plug
*);
1287 extern void blk_finish_plug(struct blk_plug
*);
1288 extern void blk_flush_plug_list(struct blk_plug
*, bool);
1290 static inline void blk_flush_plug(struct task_struct
*tsk
)
1292 struct blk_plug
*plug
= tsk
->plug
;
1295 blk_flush_plug_list(plug
, false);
1298 static inline void blk_schedule_flush_plug(struct task_struct
*tsk
)
1300 struct blk_plug
*plug
= tsk
->plug
;
1303 blk_flush_plug_list(plug
, true);
1306 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1308 struct blk_plug
*plug
= tsk
->plug
;
1311 (!list_empty(&plug
->list
) ||
1312 !list_empty(&plug
->mq_list
) ||
1313 !list_empty(&plug
->cb_list
));
1319 extern int blk_queue_start_tag(struct request_queue
*, struct request
*);
1320 extern struct request
*blk_queue_find_tag(struct request_queue
*, int);
1321 extern void blk_queue_end_tag(struct request_queue
*, struct request
*);
1322 extern int blk_queue_init_tags(struct request_queue
*, int, struct blk_queue_tag
*, int);
1323 extern void blk_queue_free_tags(struct request_queue
*);
1324 extern int blk_queue_resize_tags(struct request_queue
*, int);
1325 extern void blk_queue_invalidate_tags(struct request_queue
*);
1326 extern struct blk_queue_tag
*blk_init_tags(int, int);
1327 extern void blk_free_tags(struct blk_queue_tag
*);
1329 static inline struct request
*blk_map_queue_find_tag(struct blk_queue_tag
*bqt
,
1332 if (unlikely(bqt
== NULL
|| tag
>= bqt
->real_max_depth
))
1334 return bqt
->tag_index
[tag
];
1337 extern int blkdev_issue_flush(struct block_device
*, gfp_t
, sector_t
*);
1338 extern int blkdev_issue_write_same(struct block_device
*bdev
, sector_t sector
,
1339 sector_t nr_sects
, gfp_t gfp_mask
, struct page
*page
);
1341 #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */
1343 extern int blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1344 sector_t nr_sects
, gfp_t gfp_mask
, unsigned long flags
);
1345 extern int __blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1346 sector_t nr_sects
, gfp_t gfp_mask
, int flags
,
1349 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
1350 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
1352 extern int __blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1353 sector_t nr_sects
, gfp_t gfp_mask
, struct bio
**biop
,
1355 extern int blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1356 sector_t nr_sects
, gfp_t gfp_mask
, unsigned flags
);
1358 static inline int sb_issue_discard(struct super_block
*sb
, sector_t block
,
1359 sector_t nr_blocks
, gfp_t gfp_mask
, unsigned long flags
)
1361 return blkdev_issue_discard(sb
->s_bdev
, block
<< (sb
->s_blocksize_bits
- 9),
1362 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1365 static inline int sb_issue_zeroout(struct super_block
*sb
, sector_t block
,
1366 sector_t nr_blocks
, gfp_t gfp_mask
)
1368 return blkdev_issue_zeroout(sb
->s_bdev
,
1369 block
<< (sb
->s_blocksize_bits
- 9),
1370 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1374 extern int blk_verify_command(unsigned char *cmd
, fmode_t has_write_perm
);
1376 enum blk_default_limits
{
1377 BLK_MAX_SEGMENTS
= 128,
1378 BLK_SAFE_MAX_SECTORS
= 255,
1379 BLK_DEF_MAX_SECTORS
= 2560,
1380 BLK_MAX_SEGMENT_SIZE
= 65536,
1381 BLK_SEG_BOUNDARY_MASK
= 0xFFFFFFFFUL
,
1384 #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
1386 static inline unsigned long queue_segment_boundary(struct request_queue
*q
)
1388 return q
->limits
.seg_boundary_mask
;
1391 static inline unsigned long queue_virt_boundary(struct request_queue
*q
)
1393 return q
->limits
.virt_boundary_mask
;
1396 static inline unsigned int queue_max_sectors(struct request_queue
*q
)
1398 return q
->limits
.max_sectors
;
1401 static inline unsigned int queue_max_hw_sectors(struct request_queue
*q
)
1403 return q
->limits
.max_hw_sectors
;
1406 static inline unsigned short queue_max_segments(struct request_queue
*q
)
1408 return q
->limits
.max_segments
;
1411 static inline unsigned short queue_max_discard_segments(struct request_queue
*q
)
1413 return q
->limits
.max_discard_segments
;
1416 static inline unsigned int queue_max_segment_size(struct request_queue
*q
)
1418 return q
->limits
.max_segment_size
;
1421 static inline unsigned short queue_logical_block_size(struct request_queue
*q
)
1425 if (q
&& q
->limits
.logical_block_size
)
1426 retval
= q
->limits
.logical_block_size
;
1431 static inline unsigned short bdev_logical_block_size(struct block_device
*bdev
)
1433 return queue_logical_block_size(bdev_get_queue(bdev
));
1436 static inline unsigned int queue_physical_block_size(struct request_queue
*q
)
1438 return q
->limits
.physical_block_size
;
1441 static inline unsigned int bdev_physical_block_size(struct block_device
*bdev
)
1443 return queue_physical_block_size(bdev_get_queue(bdev
));
1446 static inline unsigned int queue_io_min(struct request_queue
*q
)
1448 return q
->limits
.io_min
;
1451 static inline int bdev_io_min(struct block_device
*bdev
)
1453 return queue_io_min(bdev_get_queue(bdev
));
1456 static inline unsigned int queue_io_opt(struct request_queue
*q
)
1458 return q
->limits
.io_opt
;
1461 static inline int bdev_io_opt(struct block_device
*bdev
)
1463 return queue_io_opt(bdev_get_queue(bdev
));
1466 static inline int queue_alignment_offset(struct request_queue
*q
)
1468 if (q
->limits
.misaligned
)
1471 return q
->limits
.alignment_offset
;
1474 static inline int queue_limit_alignment_offset(struct queue_limits
*lim
, sector_t sector
)
1476 unsigned int granularity
= max(lim
->physical_block_size
, lim
->io_min
);
1477 unsigned int alignment
= sector_div(sector
, granularity
>> 9) << 9;
1479 return (granularity
+ lim
->alignment_offset
- alignment
) % granularity
;
1482 static inline int bdev_alignment_offset(struct block_device
*bdev
)
1484 struct request_queue
*q
= bdev_get_queue(bdev
);
1486 if (q
->limits
.misaligned
)
1489 if (bdev
!= bdev
->bd_contains
)
1490 return bdev
->bd_part
->alignment_offset
;
1492 return q
->limits
.alignment_offset
;
1495 static inline int queue_discard_alignment(struct request_queue
*q
)
1497 if (q
->limits
.discard_misaligned
)
1500 return q
->limits
.discard_alignment
;
1503 static inline int queue_limit_discard_alignment(struct queue_limits
*lim
, sector_t sector
)
1505 unsigned int alignment
, granularity
, offset
;
1507 if (!lim
->max_discard_sectors
)
1510 /* Why are these in bytes, not sectors? */
1511 alignment
= lim
->discard_alignment
>> 9;
1512 granularity
= lim
->discard_granularity
>> 9;
1516 /* Offset of the partition start in 'granularity' sectors */
1517 offset
= sector_div(sector
, granularity
);
1519 /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1520 offset
= (granularity
+ alignment
- offset
) % granularity
;
1522 /* Turn it back into bytes, gaah */
1526 static inline int bdev_discard_alignment(struct block_device
*bdev
)
1528 struct request_queue
*q
= bdev_get_queue(bdev
);
1530 if (bdev
!= bdev
->bd_contains
)
1531 return bdev
->bd_part
->discard_alignment
;
1533 return q
->limits
.discard_alignment
;
1536 static inline unsigned int bdev_write_same(struct block_device
*bdev
)
1538 struct request_queue
*q
= bdev_get_queue(bdev
);
1541 return q
->limits
.max_write_same_sectors
;
1546 static inline unsigned int bdev_write_zeroes_sectors(struct block_device
*bdev
)
1548 struct request_queue
*q
= bdev_get_queue(bdev
);
1551 return q
->limits
.max_write_zeroes_sectors
;
1556 static inline enum blk_zoned_model
bdev_zoned_model(struct block_device
*bdev
)
1558 struct request_queue
*q
= bdev_get_queue(bdev
);
1561 return blk_queue_zoned_model(q
);
1563 return BLK_ZONED_NONE
;
1566 static inline bool bdev_is_zoned(struct block_device
*bdev
)
1568 struct request_queue
*q
= bdev_get_queue(bdev
);
1571 return blk_queue_is_zoned(q
);
1576 static inline unsigned int bdev_zone_sectors(struct block_device
*bdev
)
1578 struct request_queue
*q
= bdev_get_queue(bdev
);
1581 return blk_queue_zone_sectors(q
);
1586 static inline int queue_dma_alignment(struct request_queue
*q
)
1588 return q
? q
->dma_alignment
: 511;
1591 static inline int blk_rq_aligned(struct request_queue
*q
, unsigned long addr
,
1594 unsigned int alignment
= queue_dma_alignment(q
) | q
->dma_pad_mask
;
1595 return !(addr
& alignment
) && !(len
& alignment
);
1598 /* assumes size > 256 */
1599 static inline unsigned int blksize_bits(unsigned int size
)
1601 unsigned int bits
= 8;
1605 } while (size
> 256);
1609 static inline unsigned int block_size(struct block_device
*bdev
)
1611 return bdev
->bd_block_size
;
1614 static inline bool queue_flush_queueable(struct request_queue
*q
)
1616 return !test_bit(QUEUE_FLAG_FLUSH_NQ
, &q
->queue_flags
);
1619 typedef struct {struct page
*v
;} Sector
;
1621 unsigned char *read_dev_sector(struct block_device
*, sector_t
, Sector
*);
1623 static inline void put_dev_sector(Sector p
)
1628 static inline bool __bvec_gap_to_prev(struct request_queue
*q
,
1629 struct bio_vec
*bprv
, unsigned int offset
)
1632 ((bprv
->bv_offset
+ bprv
->bv_len
) & queue_virt_boundary(q
));
1636 * Check if adding a bio_vec after bprv with offset would create a gap in
1637 * the SG list. Most drivers don't care about this, but some do.
1639 static inline bool bvec_gap_to_prev(struct request_queue
*q
,
1640 struct bio_vec
*bprv
, unsigned int offset
)
1642 if (!queue_virt_boundary(q
))
1644 return __bvec_gap_to_prev(q
, bprv
, offset
);
1648 * Check if the two bvecs from two bios can be merged to one segment.
1649 * If yes, no need to check gap between the two bios since the 1st bio
1650 * and the 1st bvec in the 2nd bio can be handled in one segment.
1652 static inline bool bios_segs_mergeable(struct request_queue
*q
,
1653 struct bio
*prev
, struct bio_vec
*prev_last_bv
,
1654 struct bio_vec
*next_first_bv
)
1656 if (!BIOVEC_PHYS_MERGEABLE(prev_last_bv
, next_first_bv
))
1658 if (!BIOVEC_SEG_BOUNDARY(q
, prev_last_bv
, next_first_bv
))
1660 if (prev
->bi_seg_back_size
+ next_first_bv
->bv_len
>
1661 queue_max_segment_size(q
))
1666 static inline bool bio_will_gap(struct request_queue
*q
,
1667 struct request
*prev_rq
,
1671 if (bio_has_data(prev
) && queue_virt_boundary(q
)) {
1672 struct bio_vec pb
, nb
;
1675 * don't merge if the 1st bio starts with non-zero
1676 * offset, otherwise it is quite difficult to respect
1677 * sg gap limit. We work hard to merge a huge number of small
1678 * single bios in case of mkfs.
1681 bio_get_first_bvec(prev_rq
->bio
, &pb
);
1683 bio_get_first_bvec(prev
, &pb
);
1688 * We don't need to worry about the situation that the
1689 * merged segment ends in unaligned virt boundary:
1691 * - if 'pb' ends aligned, the merged segment ends aligned
1692 * - if 'pb' ends unaligned, the next bio must include
1693 * one single bvec of 'nb', otherwise the 'nb' can't
1696 bio_get_last_bvec(prev
, &pb
);
1697 bio_get_first_bvec(next
, &nb
);
1699 if (!bios_segs_mergeable(q
, prev
, &pb
, &nb
))
1700 return __bvec_gap_to_prev(q
, &pb
, nb
.bv_offset
);
1706 static inline bool req_gap_back_merge(struct request
*req
, struct bio
*bio
)
1708 return bio_will_gap(req
->q
, req
, req
->biotail
, bio
);
1711 static inline bool req_gap_front_merge(struct request
*req
, struct bio
*bio
)
1713 return bio_will_gap(req
->q
, NULL
, bio
, req
->bio
);
1716 int kblockd_schedule_work(struct work_struct
*work
);
1717 int kblockd_schedule_work_on(int cpu
, struct work_struct
*work
);
1718 int kblockd_schedule_delayed_work(struct delayed_work
*dwork
, unsigned long delay
);
1719 int kblockd_schedule_delayed_work_on(int cpu
, struct delayed_work
*dwork
, unsigned long delay
);
1720 int kblockd_mod_delayed_work_on(int cpu
, struct delayed_work
*dwork
, unsigned long delay
);
1722 #ifdef CONFIG_BLK_CGROUP
1724 * This should not be using sched_clock(). A real patch is in progress
1725 * to fix this up, until that is in place we need to disable preemption
1726 * around sched_clock() in this function and set_io_start_time_ns().
1728 static inline void set_start_time_ns(struct request
*req
)
1731 req
->start_time_ns
= sched_clock();
1735 static inline void set_io_start_time_ns(struct request
*req
)
1738 req
->io_start_time_ns
= sched_clock();
1742 static inline uint64_t rq_start_time_ns(struct request
*req
)
1744 return req
->start_time_ns
;
1747 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1749 return req
->io_start_time_ns
;
1752 static inline void set_start_time_ns(struct request
*req
) {}
1753 static inline void set_io_start_time_ns(struct request
*req
) {}
1754 static inline uint64_t rq_start_time_ns(struct request
*req
)
1758 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1764 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1765 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1766 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1767 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1769 #if defined(CONFIG_BLK_DEV_INTEGRITY)
1771 enum blk_integrity_flags
{
1772 BLK_INTEGRITY_VERIFY
= 1 << 0,
1773 BLK_INTEGRITY_GENERATE
= 1 << 1,
1774 BLK_INTEGRITY_DEVICE_CAPABLE
= 1 << 2,
1775 BLK_INTEGRITY_IP_CHECKSUM
= 1 << 3,
1778 struct blk_integrity_iter
{
1782 unsigned int data_size
;
1783 unsigned short interval
;
1784 const char *disk_name
;
1787 typedef blk_status_t (integrity_processing_fn
) (struct blk_integrity_iter
*);
1789 struct blk_integrity_profile
{
1790 integrity_processing_fn
*generate_fn
;
1791 integrity_processing_fn
*verify_fn
;
1795 extern void blk_integrity_register(struct gendisk
*, struct blk_integrity
*);
1796 extern void blk_integrity_unregister(struct gendisk
*);
1797 extern int blk_integrity_compare(struct gendisk
*, struct gendisk
*);
1798 extern int blk_rq_map_integrity_sg(struct request_queue
*, struct bio
*,
1799 struct scatterlist
*);
1800 extern int blk_rq_count_integrity_sg(struct request_queue
*, struct bio
*);
1801 extern bool blk_integrity_merge_rq(struct request_queue
*, struct request
*,
1803 extern bool blk_integrity_merge_bio(struct request_queue
*, struct request
*,
1806 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1808 struct blk_integrity
*bi
= &disk
->queue
->integrity
;
1817 struct blk_integrity
*bdev_get_integrity(struct block_device
*bdev
)
1819 return blk_get_integrity(bdev
->bd_disk
);
1822 static inline bool blk_integrity_rq(struct request
*rq
)
1824 return rq
->cmd_flags
& REQ_INTEGRITY
;
1827 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1830 q
->limits
.max_integrity_segments
= segs
;
1833 static inline unsigned short
1834 queue_max_integrity_segments(struct request_queue
*q
)
1836 return q
->limits
.max_integrity_segments
;
1839 static inline bool integrity_req_gap_back_merge(struct request
*req
,
1842 struct bio_integrity_payload
*bip
= bio_integrity(req
->bio
);
1843 struct bio_integrity_payload
*bip_next
= bio_integrity(next
);
1845 return bvec_gap_to_prev(req
->q
, &bip
->bip_vec
[bip
->bip_vcnt
- 1],
1846 bip_next
->bip_vec
[0].bv_offset
);
1849 static inline bool integrity_req_gap_front_merge(struct request
*req
,
1852 struct bio_integrity_payload
*bip
= bio_integrity(bio
);
1853 struct bio_integrity_payload
*bip_next
= bio_integrity(req
->bio
);
1855 return bvec_gap_to_prev(req
->q
, &bip
->bip_vec
[bip
->bip_vcnt
- 1],
1856 bip_next
->bip_vec
[0].bv_offset
);
1859 #else /* CONFIG_BLK_DEV_INTEGRITY */
1862 struct block_device
;
1864 struct blk_integrity
;
1866 static inline int blk_integrity_rq(struct request
*rq
)
1870 static inline int blk_rq_count_integrity_sg(struct request_queue
*q
,
1875 static inline int blk_rq_map_integrity_sg(struct request_queue
*q
,
1877 struct scatterlist
*s
)
1881 static inline struct blk_integrity
*bdev_get_integrity(struct block_device
*b
)
1885 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1889 static inline int blk_integrity_compare(struct gendisk
*a
, struct gendisk
*b
)
1893 static inline void blk_integrity_register(struct gendisk
*d
,
1894 struct blk_integrity
*b
)
1897 static inline void blk_integrity_unregister(struct gendisk
*d
)
1900 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1904 static inline unsigned short queue_max_integrity_segments(struct request_queue
*q
)
1908 static inline bool blk_integrity_merge_rq(struct request_queue
*rq
,
1914 static inline bool blk_integrity_merge_bio(struct request_queue
*rq
,
1921 static inline bool integrity_req_gap_back_merge(struct request
*req
,
1926 static inline bool integrity_req_gap_front_merge(struct request
*req
,
1932 #endif /* CONFIG_BLK_DEV_INTEGRITY */
1934 struct block_device_operations
{
1935 int (*open
) (struct block_device
*, fmode_t
);
1936 void (*release
) (struct gendisk
*, fmode_t
);
1937 int (*rw_page
)(struct block_device
*, sector_t
, struct page
*, bool);
1938 int (*ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1939 int (*compat_ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1940 unsigned int (*check_events
) (struct gendisk
*disk
,
1941 unsigned int clearing
);
1942 /* ->media_changed() is DEPRECATED, use ->check_events() instead */
1943 int (*media_changed
) (struct gendisk
*);
1944 void (*unlock_native_capacity
) (struct gendisk
*);
1945 int (*revalidate_disk
) (struct gendisk
*);
1946 int (*getgeo
)(struct block_device
*, struct hd_geometry
*);
1947 /* this callback is with swap_lock and sometimes page table lock held */
1948 void (*swap_slot_free_notify
) (struct block_device
*, unsigned long);
1949 struct module
*owner
;
1950 const struct pr_ops
*pr_ops
;
1953 extern int __blkdev_driver_ioctl(struct block_device
*, fmode_t
, unsigned int,
1955 extern int bdev_read_page(struct block_device
*, sector_t
, struct page
*);
1956 extern int bdev_write_page(struct block_device
*, sector_t
, struct page
*,
1957 struct writeback_control
*);
1958 #else /* CONFIG_BLOCK */
1960 struct block_device
;
1963 * stubs for when the block layer is configured out
1965 #define buffer_heads_over_limit 0
1967 static inline long nr_blockdev_pages(void)
1975 static inline void blk_start_plug(struct blk_plug
*plug
)
1979 static inline void blk_finish_plug(struct blk_plug
*plug
)
1983 static inline void blk_flush_plug(struct task_struct
*task
)
1987 static inline void blk_schedule_flush_plug(struct task_struct
*task
)
1992 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1997 static inline int blkdev_issue_flush(struct block_device
*bdev
, gfp_t gfp_mask
,
1998 sector_t
*error_sector
)
2003 #endif /* CONFIG_BLOCK */