1 #ifndef _LINUX_BLKDEV_H
2 #define _LINUX_BLKDEV_H
4 #include <linux/sched.h>
8 #include <linux/major.h>
9 #include <linux/genhd.h>
10 #include <linux/list.h>
11 #include <linux/llist.h>
12 #include <linux/timer.h>
13 #include <linux/workqueue.h>
14 #include <linux/pagemap.h>
15 #include <linux/backing-dev-defs.h>
16 #include <linux/wait.h>
17 #include <linux/mempool.h>
18 #include <linux/pfn.h>
19 #include <linux/bio.h>
20 #include <linux/stringify.h>
21 #include <linux/gfp.h>
22 #include <linux/bsg.h>
23 #include <linux/smp.h>
24 #include <linux/rcupdate.h>
25 #include <linux/percpu-refcount.h>
26 #include <linux/scatterlist.h>
27 #include <linux/blkzoned.h>
30 struct scsi_ioctl_command
;
33 struct elevator_queue
;
39 struct blk_flush_queue
;
43 #define BLKDEV_MIN_RQ 4
44 #define BLKDEV_MAX_RQ 128 /* Default maximum */
47 * Maximum number of blkcg policies allowed to be registered concurrently.
48 * Defined here to simplify include dependency.
50 #define BLKCG_MAX_POLS 2
52 typedef void (rq_end_io_fn
)(struct request
*, int);
54 #define BLK_RL_SYNCFULL (1U << 0)
55 #define BLK_RL_ASYNCFULL (1U << 1)
58 struct request_queue
*q
; /* the queue this rl belongs to */
59 #ifdef CONFIG_BLK_CGROUP
60 struct blkcg_gq
*blkg
; /* blkg this request pool belongs to */
63 * count[], starved[], and wait[] are indexed by
64 * BLK_RW_SYNC/BLK_RW_ASYNC
69 wait_queue_head_t wait
[2];
74 * request command types
76 enum rq_cmd_type_bits
{
77 REQ_TYPE_FS
= 1, /* fs request */
78 REQ_TYPE_BLOCK_PC
, /* scsi command */
79 REQ_TYPE_DRV_PRIV
, /* driver defined types from here */
84 typedef __u32 __bitwise req_flags_t
;
86 /* elevator knows about this request */
87 #define RQF_SORTED ((__force req_flags_t)(1 << 0))
88 /* drive already may have started this one */
89 #define RQF_STARTED ((__force req_flags_t)(1 << 1))
90 /* uses tagged queueing */
91 #define RQF_QUEUED ((__force req_flags_t)(1 << 2))
92 /* may not be passed by ioscheduler */
93 #define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3))
94 /* request for flush sequence */
95 #define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4))
96 /* merge of different types, fail separately */
97 #define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5))
98 /* track inflight for MQ */
99 #define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6))
100 /* don't call prep for this one */
101 #define RQF_DONTPREP ((__force req_flags_t)(1 << 7))
102 /* set for "ide_preempt" requests and also for requests for which the SCSI
103 "quiesce" state must be ignored. */
104 #define RQF_PREEMPT ((__force req_flags_t)(1 << 8))
105 /* contains copies of user pages */
106 #define RQF_COPY_USER ((__force req_flags_t)(1 << 9))
107 /* vaguely specified driver internal error. Ignored by the block layer */
108 #define RQF_FAILED ((__force req_flags_t)(1 << 10))
109 /* don't warn about errors */
110 #define RQF_QUIET ((__force req_flags_t)(1 << 11))
111 /* elevator private data attached */
112 #define RQF_ELVPRIV ((__force req_flags_t)(1 << 12))
113 /* account I/O stat */
114 #define RQF_IO_STAT ((__force req_flags_t)(1 << 13))
115 /* request came from our alloc pool */
116 #define RQF_ALLOCED ((__force req_flags_t)(1 << 14))
117 /* runtime pm request */
118 #define RQF_PM ((__force req_flags_t)(1 << 15))
119 /* on IO scheduler merge hash */
120 #define RQF_HASHED ((__force req_flags_t)(1 << 16))
121 /* IO stats tracking on */
122 #define RQF_STATS ((__force req_flags_t)(1 << 17))
123 /* Look at ->special_vec for the actual data payload instead of the
125 #define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18))
127 /* flags that prevent us from merging requests: */
128 #define RQF_NOMERGE_FLAGS \
129 (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD)
131 #define BLK_MAX_CDB 16
134 * Try to put the fields that are referenced together in the same cacheline.
136 * If you modify this structure, make sure to update blk_rq_init() and
137 * especially blk_mq_rq_ctx_init() to take care of the added fields.
140 struct list_head queuelist
;
142 struct call_single_data csd
;
146 struct request_queue
*q
;
147 struct blk_mq_ctx
*mq_ctx
;
151 unsigned int cmd_flags
; /* op and common flags */
152 req_flags_t rq_flags
;
153 unsigned long atomic_flags
;
155 /* the following two fields are internal, NEVER access directly */
156 unsigned int __data_len
; /* total data len */
157 sector_t __sector
; /* sector cursor */
163 * The hash is used inside the scheduler, and killed once the
164 * request reaches the dispatch list. The ipi_list is only used
165 * to queue the request for softirq completion, which is long
166 * after the request has been unhashed (and even removed from
167 * the dispatch list).
170 struct hlist_node hash
; /* merge hash */
171 struct list_head ipi_list
;
175 * The rb_node is only used inside the io scheduler, requests
176 * are pruned when moved to the dispatch queue. So let the
177 * completion_data share space with the rb_node.
180 struct rb_node rb_node
; /* sort/lookup */
181 struct bio_vec special_vec
;
182 void *completion_data
;
186 * Three pointers are available for the IO schedulers, if they need
187 * more they have to dynamically allocate it. Flush requests are
188 * never put on the IO scheduler. So let the flush fields share
189 * space with the elevator data.
199 struct list_head list
;
200 rq_end_io_fn
*saved_end_io
;
204 struct gendisk
*rq_disk
;
205 struct hd_struct
*part
;
206 unsigned long start_time
;
207 struct blk_issue_stat issue_stat
;
208 #ifdef CONFIG_BLK_CGROUP
209 struct request_list
*rl
; /* rl this rq is alloced from */
210 unsigned long long start_time_ns
;
211 unsigned long long io_start_time_ns
; /* when passed to hardware */
213 /* Number of scatter-gather DMA addr+len pairs after
214 * physical address coalescing is performed.
216 unsigned short nr_phys_segments
;
217 #if defined(CONFIG_BLK_DEV_INTEGRITY)
218 unsigned short nr_integrity_segments
;
221 unsigned short ioprio
;
223 void *special
; /* opaque pointer available for LLD use */
229 * when request is used as a packet command carrier
231 unsigned char __cmd
[BLK_MAX_CDB
];
233 unsigned short cmd_len
;
235 unsigned int extra_len
; /* length of alignment and padding */
236 unsigned int sense_len
;
237 unsigned int resid_len
; /* residual count */
240 unsigned long deadline
;
241 struct list_head timeout_list
;
242 unsigned int timeout
;
246 * completion callback.
248 rq_end_io_fn
*end_io
;
252 struct request
*next_rq
;
255 static inline unsigned short req_get_ioprio(struct request
*req
)
260 #include <linux/elevator.h>
262 struct blk_queue_ctx
;
264 typedef void (request_fn_proc
) (struct request_queue
*q
);
265 typedef blk_qc_t (make_request_fn
) (struct request_queue
*q
, struct bio
*bio
);
266 typedef int (prep_rq_fn
) (struct request_queue
*, struct request
*);
267 typedef void (unprep_rq_fn
) (struct request_queue
*, struct request
*);
270 typedef void (softirq_done_fn
)(struct request
*);
271 typedef int (dma_drain_needed_fn
)(struct request
*);
272 typedef int (lld_busy_fn
) (struct request_queue
*q
);
273 typedef int (bsg_job_fn
) (struct bsg_job
*);
275 enum blk_eh_timer_return
{
281 typedef enum blk_eh_timer_return (rq_timed_out_fn
)(struct request
*);
283 enum blk_queue_state
{
288 struct blk_queue_tag
{
289 struct request
**tag_index
; /* map of busy tags */
290 unsigned long *tag_map
; /* bit map of free/busy tags */
291 int max_depth
; /* what we will send to device */
292 int real_max_depth
; /* what the array can hold */
293 atomic_t refcnt
; /* map can be shared */
294 int alloc_policy
; /* tag allocation policy */
295 int next_tag
; /* next tag */
297 #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */
298 #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */
300 #define BLK_SCSI_MAX_CMDS (256)
301 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
304 * Zoned block device models (zoned limit).
306 enum blk_zoned_model
{
307 BLK_ZONED_NONE
, /* Regular block device */
308 BLK_ZONED_HA
, /* Host-aware zoned block device */
309 BLK_ZONED_HM
, /* Host-managed zoned block device */
312 struct queue_limits
{
313 unsigned long bounce_pfn
;
314 unsigned long seg_boundary_mask
;
315 unsigned long virt_boundary_mask
;
317 unsigned int max_hw_sectors
;
318 unsigned int max_dev_sectors
;
319 unsigned int chunk_sectors
;
320 unsigned int max_sectors
;
321 unsigned int max_segment_size
;
322 unsigned int physical_block_size
;
323 unsigned int alignment_offset
;
326 unsigned int max_discard_sectors
;
327 unsigned int max_hw_discard_sectors
;
328 unsigned int max_write_same_sectors
;
329 unsigned int max_write_zeroes_sectors
;
330 unsigned int discard_granularity
;
331 unsigned int discard_alignment
;
333 unsigned short logical_block_size
;
334 unsigned short max_segments
;
335 unsigned short max_integrity_segments
;
337 unsigned char misaligned
;
338 unsigned char discard_misaligned
;
339 unsigned char cluster
;
340 unsigned char discard_zeroes_data
;
341 unsigned char raid_partial_stripes_expensive
;
342 enum blk_zoned_model zoned
;
345 #ifdef CONFIG_BLK_DEV_ZONED
347 struct blk_zone_report_hdr
{
348 unsigned int nr_zones
;
352 extern int blkdev_report_zones(struct block_device
*bdev
,
353 sector_t sector
, struct blk_zone
*zones
,
354 unsigned int *nr_zones
, gfp_t gfp_mask
);
355 extern int blkdev_reset_zones(struct block_device
*bdev
, sector_t sectors
,
356 sector_t nr_sectors
, gfp_t gfp_mask
);
358 extern int blkdev_report_zones_ioctl(struct block_device
*bdev
, fmode_t mode
,
359 unsigned int cmd
, unsigned long arg
);
360 extern int blkdev_reset_zones_ioctl(struct block_device
*bdev
, fmode_t mode
,
361 unsigned int cmd
, unsigned long arg
);
363 #else /* CONFIG_BLK_DEV_ZONED */
365 static inline int blkdev_report_zones_ioctl(struct block_device
*bdev
,
366 fmode_t mode
, unsigned int cmd
,
372 static inline int blkdev_reset_zones_ioctl(struct block_device
*bdev
,
373 fmode_t mode
, unsigned int cmd
,
379 #endif /* CONFIG_BLK_DEV_ZONED */
381 struct request_queue
{
383 * Together with queue_head for cacheline sharing
385 struct list_head queue_head
;
386 struct request
*last_merge
;
387 struct elevator_queue
*elevator
;
388 int nr_rqs
[2]; /* # allocated [a]sync rqs */
389 int nr_rqs_elvpriv
; /* # allocated rqs w/ elvpriv */
394 * If blkcg is not used, @q->root_rl serves all requests. If blkcg
395 * is used, root blkg allocates from @q->root_rl and all other
396 * blkgs from their own blkg->rl. Which one to use should be
397 * determined using bio_request_list().
399 struct request_list root_rl
;
401 request_fn_proc
*request_fn
;
402 make_request_fn
*make_request_fn
;
403 prep_rq_fn
*prep_rq_fn
;
404 unprep_rq_fn
*unprep_rq_fn
;
405 softirq_done_fn
*softirq_done_fn
;
406 rq_timed_out_fn
*rq_timed_out_fn
;
407 dma_drain_needed_fn
*dma_drain_needed
;
408 lld_busy_fn
*lld_busy_fn
;
410 struct blk_mq_ops
*mq_ops
;
412 unsigned int *mq_map
;
415 struct blk_mq_ctx __percpu
*queue_ctx
;
416 unsigned int nr_queues
;
418 unsigned int queue_depth
;
420 /* hw dispatch queues */
421 struct blk_mq_hw_ctx
**queue_hw_ctx
;
422 unsigned int nr_hw_queues
;
425 * Dispatch queue sorting
428 struct request
*boundary_rq
;
431 * Delayed queue handling
433 struct delayed_work delay_work
;
435 struct backing_dev_info backing_dev_info
;
438 * The queue owner gets to use this for whatever they like.
439 * ll_rw_blk doesn't touch it.
444 * various queue flags, see QUEUE_* below
446 unsigned long queue_flags
;
449 * ida allocated id for this queue. Used to index queues from
455 * queue needs bounce pages for pages above this limit
460 * protects queue structures from reentrancy. ->__queue_lock should
461 * _never_ be used directly, it is queue private. always use
464 spinlock_t __queue_lock
;
465 spinlock_t
*queue_lock
;
475 struct kobject mq_kobj
;
477 #ifdef CONFIG_BLK_DEV_INTEGRITY
478 struct blk_integrity integrity
;
479 #endif /* CONFIG_BLK_DEV_INTEGRITY */
484 unsigned int nr_pending
;
490 unsigned long nr_requests
; /* Max # of requests */
491 unsigned int nr_congestion_on
;
492 unsigned int nr_congestion_off
;
493 unsigned int nr_batching
;
495 unsigned int dma_drain_size
;
496 void *dma_drain_buffer
;
497 unsigned int dma_pad_mask
;
498 unsigned int dma_alignment
;
500 struct blk_queue_tag
*queue_tags
;
501 struct list_head tag_busy_list
;
503 unsigned int nr_sorted
;
504 unsigned int in_flight
[2];
506 struct blk_rq_stat rq_stats
[2];
509 * Number of active block driver functions for which blk_drain_queue()
510 * must wait. Must be incremented around functions that unlock the
511 * queue_lock internally, e.g. scsi_request_fn().
513 unsigned int request_fn_active
;
515 unsigned int rq_timeout
;
517 struct timer_list timeout
;
518 struct work_struct timeout_work
;
519 struct list_head timeout_list
;
521 struct list_head icq_list
;
522 #ifdef CONFIG_BLK_CGROUP
523 DECLARE_BITMAP (blkcg_pols
, BLKCG_MAX_POLS
);
524 struct blkcg_gq
*root_blkg
;
525 struct list_head blkg_list
;
528 struct queue_limits limits
;
533 unsigned int sg_timeout
;
534 unsigned int sg_reserved_size
;
536 #ifdef CONFIG_BLK_DEV_IO_TRACE
537 struct blk_trace
*blk_trace
;
540 * for flush operations
542 struct blk_flush_queue
*fq
;
544 struct list_head requeue_list
;
545 spinlock_t requeue_lock
;
546 struct delayed_work requeue_work
;
548 struct mutex sysfs_lock
;
551 atomic_t mq_freeze_depth
;
553 #if defined(CONFIG_BLK_DEV_BSG)
554 bsg_job_fn
*bsg_job_fn
;
556 struct bsg_class_device bsg_dev
;
559 #ifdef CONFIG_BLK_DEV_THROTTLING
561 struct throtl_data
*td
;
563 struct rcu_head rcu_head
;
564 wait_queue_head_t mq_freeze_wq
;
565 struct percpu_ref q_usage_counter
;
566 struct list_head all_q_node
;
568 struct blk_mq_tag_set
*tag_set
;
569 struct list_head tag_set_list
;
570 struct bio_set
*bio_split
;
572 bool mq_sysfs_init_done
;
575 #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */
576 #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */
577 #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */
578 #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */
579 #define QUEUE_FLAG_DYING 5 /* queue being torn down */
580 #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */
581 #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */
582 #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */
583 #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */
584 #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */
585 #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */
586 #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */
587 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
588 #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */
589 #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */
590 #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */
591 #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */
592 #define QUEUE_FLAG_SECERASE 17 /* supports secure erase */
593 #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */
594 #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */
595 #define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */
596 #define QUEUE_FLAG_NO_SG_MERGE 21 /* don't attempt to merge SG segments*/
597 #define QUEUE_FLAG_POLL 22 /* IO polling enabled if set */
598 #define QUEUE_FLAG_WC 23 /* Write back caching */
599 #define QUEUE_FLAG_FUA 24 /* device supports FUA writes */
600 #define QUEUE_FLAG_FLUSH_NQ 25 /* flush not queueuable */
601 #define QUEUE_FLAG_DAX 26 /* device supports DAX */
602 #define QUEUE_FLAG_STATS 27 /* track rq completion times */
604 #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
605 (1 << QUEUE_FLAG_STACKABLE) | \
606 (1 << QUEUE_FLAG_SAME_COMP) | \
607 (1 << QUEUE_FLAG_ADD_RANDOM))
609 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
610 (1 << QUEUE_FLAG_STACKABLE) | \
611 (1 << QUEUE_FLAG_SAME_COMP) | \
612 (1 << QUEUE_FLAG_POLL))
614 static inline void queue_lockdep_assert_held(struct request_queue
*q
)
617 lockdep_assert_held(q
->queue_lock
);
620 static inline void queue_flag_set_unlocked(unsigned int flag
,
621 struct request_queue
*q
)
623 __set_bit(flag
, &q
->queue_flags
);
626 static inline int queue_flag_test_and_clear(unsigned int flag
,
627 struct request_queue
*q
)
629 queue_lockdep_assert_held(q
);
631 if (test_bit(flag
, &q
->queue_flags
)) {
632 __clear_bit(flag
, &q
->queue_flags
);
639 static inline int queue_flag_test_and_set(unsigned int flag
,
640 struct request_queue
*q
)
642 queue_lockdep_assert_held(q
);
644 if (!test_bit(flag
, &q
->queue_flags
)) {
645 __set_bit(flag
, &q
->queue_flags
);
652 static inline void queue_flag_set(unsigned int flag
, struct request_queue
*q
)
654 queue_lockdep_assert_held(q
);
655 __set_bit(flag
, &q
->queue_flags
);
658 static inline void queue_flag_clear_unlocked(unsigned int flag
,
659 struct request_queue
*q
)
661 __clear_bit(flag
, &q
->queue_flags
);
664 static inline int queue_in_flight(struct request_queue
*q
)
666 return q
->in_flight
[0] + q
->in_flight
[1];
669 static inline void queue_flag_clear(unsigned int flag
, struct request_queue
*q
)
671 queue_lockdep_assert_held(q
);
672 __clear_bit(flag
, &q
->queue_flags
);
675 #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
676 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
677 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
678 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
679 #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags)
680 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
681 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
682 #define blk_queue_noxmerges(q) \
683 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
684 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
685 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
686 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
687 #define blk_queue_stackable(q) \
688 test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
689 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
690 #define blk_queue_secure_erase(q) \
691 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
692 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
694 #define blk_noretry_request(rq) \
695 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
696 REQ_FAILFAST_DRIVER))
698 #define blk_account_rq(rq) \
699 (((rq)->rq_flags & RQF_STARTED) && \
700 ((rq)->cmd_type == REQ_TYPE_FS))
702 #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
703 #define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
704 /* rq->queuelist of dequeued request must be list_empty() */
705 #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
707 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
709 #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ)
712 * Driver can handle struct request, if it either has an old style
713 * request_fn defined, or is blk-mq based.
715 static inline bool queue_is_rq_based(struct request_queue
*q
)
717 return q
->request_fn
|| q
->mq_ops
;
720 static inline unsigned int blk_queue_cluster(struct request_queue
*q
)
722 return q
->limits
.cluster
;
725 static inline enum blk_zoned_model
726 blk_queue_zoned_model(struct request_queue
*q
)
728 return q
->limits
.zoned
;
731 static inline bool blk_queue_is_zoned(struct request_queue
*q
)
733 switch (blk_queue_zoned_model(q
)) {
742 static inline unsigned int blk_queue_zone_sectors(struct request_queue
*q
)
744 return blk_queue_is_zoned(q
) ? q
->limits
.chunk_sectors
: 0;
747 static inline bool rq_is_sync(struct request
*rq
)
749 return op_is_sync(rq
->cmd_flags
);
752 static inline bool blk_rl_full(struct request_list
*rl
, bool sync
)
754 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
756 return rl
->flags
& flag
;
759 static inline void blk_set_rl_full(struct request_list
*rl
, bool sync
)
761 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
766 static inline void blk_clear_rl_full(struct request_list
*rl
, bool sync
)
768 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
773 static inline bool rq_mergeable(struct request
*rq
)
775 if (rq
->cmd_type
!= REQ_TYPE_FS
)
778 if (req_op(rq
) == REQ_OP_FLUSH
)
781 if (req_op(rq
) == REQ_OP_WRITE_ZEROES
)
784 if (rq
->cmd_flags
& REQ_NOMERGE_FLAGS
)
786 if (rq
->rq_flags
& RQF_NOMERGE_FLAGS
)
792 static inline bool blk_write_same_mergeable(struct bio
*a
, struct bio
*b
)
794 if (bio_data(a
) == bio_data(b
))
800 static inline unsigned int blk_queue_depth(struct request_queue
*q
)
803 return q
->queue_depth
;
805 return q
->nr_requests
;
809 * q->prep_rq_fn return values
812 BLKPREP_OK
, /* serve it */
813 BLKPREP_KILL
, /* fatal error, kill, return -EIO */
814 BLKPREP_DEFER
, /* leave on queue */
815 BLKPREP_INVALID
, /* invalid command, kill, return -EREMOTEIO */
818 extern unsigned long blk_max_low_pfn
, blk_max_pfn
;
821 * standard bounce addresses:
823 * BLK_BOUNCE_HIGH : bounce all highmem pages
824 * BLK_BOUNCE_ANY : don't bounce anything
825 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
828 #if BITS_PER_LONG == 32
829 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
831 #define BLK_BOUNCE_HIGH -1ULL
833 #define BLK_BOUNCE_ANY (-1ULL)
834 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
837 * default timeout for SG_IO if none specified
839 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
840 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
843 extern int init_emergency_isa_pool(void);
844 extern void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
);
846 static inline int init_emergency_isa_pool(void)
850 static inline void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
)
853 #endif /* CONFIG_MMU */
859 unsigned long offset
;
864 struct req_iterator
{
865 struct bvec_iter iter
;
869 /* This should not be used directly - use rq_for_each_segment */
870 #define for_each_bio(_bio) \
871 for (; _bio; _bio = _bio->bi_next)
872 #define __rq_for_each_bio(_bio, rq) \
874 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
876 #define rq_for_each_segment(bvl, _rq, _iter) \
877 __rq_for_each_bio(_iter.bio, _rq) \
878 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
880 #define rq_iter_last(bvec, _iter) \
881 (_iter.bio->bi_next == NULL && \
882 bio_iter_last(bvec, _iter.iter))
884 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
885 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
887 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
888 extern void rq_flush_dcache_pages(struct request
*rq
);
890 static inline void rq_flush_dcache_pages(struct request
*rq
)
896 #define vfs_msg(sb, level, fmt, ...) \
897 __vfs_msg(sb, level, fmt, ##__VA_ARGS__)
899 #define vfs_msg(sb, level, fmt, ...) \
901 no_printk(fmt, ##__VA_ARGS__); \
902 __vfs_msg(sb, "", " "); \
906 extern int blk_register_queue(struct gendisk
*disk
);
907 extern void blk_unregister_queue(struct gendisk
*disk
);
908 extern blk_qc_t
generic_make_request(struct bio
*bio
);
909 extern void blk_rq_init(struct request_queue
*q
, struct request
*rq
);
910 extern void blk_put_request(struct request
*);
911 extern void __blk_put_request(struct request_queue
*, struct request
*);
912 extern struct request
*blk_get_request(struct request_queue
*, int, gfp_t
);
913 extern void blk_rq_set_block_pc(struct request
*);
914 extern void blk_requeue_request(struct request_queue
*, struct request
*);
915 extern int blk_lld_busy(struct request_queue
*q
);
916 extern int blk_rq_prep_clone(struct request
*rq
, struct request
*rq_src
,
917 struct bio_set
*bs
, gfp_t gfp_mask
,
918 int (*bio_ctr
)(struct bio
*, struct bio
*, void *),
920 extern void blk_rq_unprep_clone(struct request
*rq
);
921 extern int blk_insert_cloned_request(struct request_queue
*q
,
923 extern int blk_rq_append_bio(struct request
*rq
, struct bio
*bio
);
924 extern void blk_delay_queue(struct request_queue
*, unsigned long);
925 extern void blk_queue_split(struct request_queue
*, struct bio
**,
927 extern void blk_recount_segments(struct request_queue
*, struct bio
*);
928 extern int scsi_verify_blk_ioctl(struct block_device
*, unsigned int);
929 extern int scsi_cmd_blk_ioctl(struct block_device
*, fmode_t
,
930 unsigned int, void __user
*);
931 extern int scsi_cmd_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
932 unsigned int, void __user
*);
933 extern int sg_scsi_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
934 struct scsi_ioctl_command __user
*);
936 extern int blk_queue_enter(struct request_queue
*q
, bool nowait
);
937 extern void blk_queue_exit(struct request_queue
*q
);
938 extern void blk_start_queue(struct request_queue
*q
);
939 extern void blk_start_queue_async(struct request_queue
*q
);
940 extern void blk_stop_queue(struct request_queue
*q
);
941 extern void blk_sync_queue(struct request_queue
*q
);
942 extern void __blk_stop_queue(struct request_queue
*q
);
943 extern void __blk_run_queue(struct request_queue
*q
);
944 extern void __blk_run_queue_uncond(struct request_queue
*q
);
945 extern void blk_run_queue(struct request_queue
*);
946 extern void blk_run_queue_async(struct request_queue
*q
);
947 extern void blk_mq_quiesce_queue(struct request_queue
*q
);
948 extern int blk_rq_map_user(struct request_queue
*, struct request
*,
949 struct rq_map_data
*, void __user
*, unsigned long,
951 extern int blk_rq_unmap_user(struct bio
*);
952 extern int blk_rq_map_kern(struct request_queue
*, struct request
*, void *, unsigned int, gfp_t
);
953 extern int blk_rq_map_user_iov(struct request_queue
*, struct request
*,
954 struct rq_map_data
*, const struct iov_iter
*,
956 extern int blk_execute_rq(struct request_queue
*, struct gendisk
*,
957 struct request
*, int);
958 extern void blk_execute_rq_nowait(struct request_queue
*, struct gendisk
*,
959 struct request
*, int, rq_end_io_fn
*);
961 bool blk_mq_poll(struct request_queue
*q
, blk_qc_t cookie
);
963 static inline struct request_queue
*bdev_get_queue(struct block_device
*bdev
)
965 return bdev
->bd_disk
->queue
; /* this is never NULL */
969 * blk_rq_pos() : the current sector
970 * blk_rq_bytes() : bytes left in the entire request
971 * blk_rq_cur_bytes() : bytes left in the current segment
972 * blk_rq_err_bytes() : bytes left till the next error boundary
973 * blk_rq_sectors() : sectors left in the entire request
974 * blk_rq_cur_sectors() : sectors left in the current segment
976 static inline sector_t
blk_rq_pos(const struct request
*rq
)
981 static inline unsigned int blk_rq_bytes(const struct request
*rq
)
983 return rq
->__data_len
;
986 static inline int blk_rq_cur_bytes(const struct request
*rq
)
988 return rq
->bio
? bio_cur_bytes(rq
->bio
) : 0;
991 extern unsigned int blk_rq_err_bytes(const struct request
*rq
);
993 static inline unsigned int blk_rq_sectors(const struct request
*rq
)
995 return blk_rq_bytes(rq
) >> 9;
998 static inline unsigned int blk_rq_cur_sectors(const struct request
*rq
)
1000 return blk_rq_cur_bytes(rq
) >> 9;
1004 * Some commands like WRITE SAME have a payload or data transfer size which
1005 * is different from the size of the request. Any driver that supports such
1006 * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to
1007 * calculate the data transfer size.
1009 static inline unsigned int blk_rq_payload_bytes(struct request
*rq
)
1011 if (rq
->rq_flags
& RQF_SPECIAL_PAYLOAD
)
1012 return rq
->special_vec
.bv_len
;
1013 return blk_rq_bytes(rq
);
1016 static inline unsigned int blk_queue_get_max_sectors(struct request_queue
*q
,
1019 if (unlikely(op
== REQ_OP_DISCARD
|| op
== REQ_OP_SECURE_ERASE
))
1020 return min(q
->limits
.max_discard_sectors
, UINT_MAX
>> 9);
1022 if (unlikely(op
== REQ_OP_WRITE_SAME
))
1023 return q
->limits
.max_write_same_sectors
;
1025 if (unlikely(op
== REQ_OP_WRITE_ZEROES
))
1026 return q
->limits
.max_write_zeroes_sectors
;
1028 return q
->limits
.max_sectors
;
1032 * Return maximum size of a request at given offset. Only valid for
1033 * file system requests.
1035 static inline unsigned int blk_max_size_offset(struct request_queue
*q
,
1038 if (!q
->limits
.chunk_sectors
)
1039 return q
->limits
.max_sectors
;
1041 return q
->limits
.chunk_sectors
-
1042 (offset
& (q
->limits
.chunk_sectors
- 1));
1045 static inline unsigned int blk_rq_get_max_sectors(struct request
*rq
,
1048 struct request_queue
*q
= rq
->q
;
1050 if (unlikely(rq
->cmd_type
!= REQ_TYPE_FS
))
1051 return q
->limits
.max_hw_sectors
;
1053 if (!q
->limits
.chunk_sectors
||
1054 req_op(rq
) == REQ_OP_DISCARD
||
1055 req_op(rq
) == REQ_OP_SECURE_ERASE
)
1056 return blk_queue_get_max_sectors(q
, req_op(rq
));
1058 return min(blk_max_size_offset(q
, offset
),
1059 blk_queue_get_max_sectors(q
, req_op(rq
)));
1062 static inline unsigned int blk_rq_count_bios(struct request
*rq
)
1064 unsigned int nr_bios
= 0;
1067 __rq_for_each_bio(bio
, rq
)
1074 * blk_rq_set_prio - associate a request with prio from ioc
1075 * @rq: request of interest
1076 * @ioc: target iocontext
1078 * Assocate request prio with ioc prio so request based drivers
1079 * can leverage priority information.
1081 static inline void blk_rq_set_prio(struct request
*rq
, struct io_context
*ioc
)
1084 rq
->ioprio
= ioc
->ioprio
;
1088 * Request issue related functions.
1090 extern struct request
*blk_peek_request(struct request_queue
*q
);
1091 extern void blk_start_request(struct request
*rq
);
1092 extern struct request
*blk_fetch_request(struct request_queue
*q
);
1095 * Request completion related functions.
1097 * blk_update_request() completes given number of bytes and updates
1098 * the request without completing it.
1100 * blk_end_request() and friends. __blk_end_request() must be called
1101 * with the request queue spinlock acquired.
1103 * Several drivers define their own end_request and call
1104 * blk_end_request() for parts of the original function.
1105 * This prevents code duplication in drivers.
1107 extern bool blk_update_request(struct request
*rq
, int error
,
1108 unsigned int nr_bytes
);
1109 extern void blk_finish_request(struct request
*rq
, int error
);
1110 extern bool blk_end_request(struct request
*rq
, int error
,
1111 unsigned int nr_bytes
);
1112 extern void blk_end_request_all(struct request
*rq
, int error
);
1113 extern bool blk_end_request_cur(struct request
*rq
, int error
);
1114 extern bool blk_end_request_err(struct request
*rq
, int error
);
1115 extern bool __blk_end_request(struct request
*rq
, int error
,
1116 unsigned int nr_bytes
);
1117 extern void __blk_end_request_all(struct request
*rq
, int error
);
1118 extern bool __blk_end_request_cur(struct request
*rq
, int error
);
1119 extern bool __blk_end_request_err(struct request
*rq
, int error
);
1121 extern void blk_complete_request(struct request
*);
1122 extern void __blk_complete_request(struct request
*);
1123 extern void blk_abort_request(struct request
*);
1124 extern void blk_unprep_request(struct request
*);
1127 * Access functions for manipulating queue properties
1129 extern struct request_queue
*blk_init_queue_node(request_fn_proc
*rfn
,
1130 spinlock_t
*lock
, int node_id
);
1131 extern struct request_queue
*blk_init_queue(request_fn_proc
*, spinlock_t
*);
1132 extern struct request_queue
*blk_init_allocated_queue(struct request_queue
*,
1133 request_fn_proc
*, spinlock_t
*);
1134 extern void blk_cleanup_queue(struct request_queue
*);
1135 extern void blk_queue_make_request(struct request_queue
*, make_request_fn
*);
1136 extern void blk_queue_bounce_limit(struct request_queue
*, u64
);
1137 extern void blk_queue_max_hw_sectors(struct request_queue
*, unsigned int);
1138 extern void blk_queue_chunk_sectors(struct request_queue
*, unsigned int);
1139 extern void blk_queue_max_segments(struct request_queue
*, unsigned short);
1140 extern void blk_queue_max_segment_size(struct request_queue
*, unsigned int);
1141 extern void blk_queue_max_discard_sectors(struct request_queue
*q
,
1142 unsigned int max_discard_sectors
);
1143 extern void blk_queue_max_write_same_sectors(struct request_queue
*q
,
1144 unsigned int max_write_same_sectors
);
1145 extern void blk_queue_max_write_zeroes_sectors(struct request_queue
*q
,
1146 unsigned int max_write_same_sectors
);
1147 extern void blk_queue_logical_block_size(struct request_queue
*, unsigned short);
1148 extern void blk_queue_physical_block_size(struct request_queue
*, unsigned int);
1149 extern void blk_queue_alignment_offset(struct request_queue
*q
,
1150 unsigned int alignment
);
1151 extern void blk_limits_io_min(struct queue_limits
*limits
, unsigned int min
);
1152 extern void blk_queue_io_min(struct request_queue
*q
, unsigned int min
);
1153 extern void blk_limits_io_opt(struct queue_limits
*limits
, unsigned int opt
);
1154 extern void blk_queue_io_opt(struct request_queue
*q
, unsigned int opt
);
1155 extern void blk_set_queue_depth(struct request_queue
*q
, unsigned int depth
);
1156 extern void blk_set_default_limits(struct queue_limits
*lim
);
1157 extern void blk_set_stacking_limits(struct queue_limits
*lim
);
1158 extern int blk_stack_limits(struct queue_limits
*t
, struct queue_limits
*b
,
1160 extern int bdev_stack_limits(struct queue_limits
*t
, struct block_device
*bdev
,
1162 extern void disk_stack_limits(struct gendisk
*disk
, struct block_device
*bdev
,
1164 extern void blk_queue_stack_limits(struct request_queue
*t
, struct request_queue
*b
);
1165 extern void blk_queue_dma_pad(struct request_queue
*, unsigned int);
1166 extern void blk_queue_update_dma_pad(struct request_queue
*, unsigned int);
1167 extern int blk_queue_dma_drain(struct request_queue
*q
,
1168 dma_drain_needed_fn
*dma_drain_needed
,
1169 void *buf
, unsigned int size
);
1170 extern void blk_queue_lld_busy(struct request_queue
*q
, lld_busy_fn
*fn
);
1171 extern void blk_queue_segment_boundary(struct request_queue
*, unsigned long);
1172 extern void blk_queue_virt_boundary(struct request_queue
*, unsigned long);
1173 extern void blk_queue_prep_rq(struct request_queue
*, prep_rq_fn
*pfn
);
1174 extern void blk_queue_unprep_rq(struct request_queue
*, unprep_rq_fn
*ufn
);
1175 extern void blk_queue_dma_alignment(struct request_queue
*, int);
1176 extern void blk_queue_update_dma_alignment(struct request_queue
*, int);
1177 extern void blk_queue_softirq_done(struct request_queue
*, softirq_done_fn
*);
1178 extern void blk_queue_rq_timed_out(struct request_queue
*, rq_timed_out_fn
*);
1179 extern void blk_queue_rq_timeout(struct request_queue
*, unsigned int);
1180 extern void blk_queue_flush_queueable(struct request_queue
*q
, bool queueable
);
1181 extern void blk_queue_write_cache(struct request_queue
*q
, bool enabled
, bool fua
);
1182 extern struct backing_dev_info
*blk_get_backing_dev_info(struct block_device
*bdev
);
1184 static inline unsigned short blk_rq_nr_phys_segments(struct request
*rq
)
1186 if (rq
->rq_flags
& RQF_SPECIAL_PAYLOAD
)
1188 return rq
->nr_phys_segments
;
1191 extern int blk_rq_map_sg(struct request_queue
*, struct request
*, struct scatterlist
*);
1192 extern void blk_dump_rq_flags(struct request
*, char *);
1193 extern long nr_blockdev_pages(void);
1195 bool __must_check
blk_get_queue(struct request_queue
*);
1196 struct request_queue
*blk_alloc_queue(gfp_t
);
1197 struct request_queue
*blk_alloc_queue_node(gfp_t
, int);
1198 extern void blk_put_queue(struct request_queue
*);
1199 extern void blk_set_queue_dying(struct request_queue
*);
1202 * block layer runtime pm functions
1205 extern void blk_pm_runtime_init(struct request_queue
*q
, struct device
*dev
);
1206 extern int blk_pre_runtime_suspend(struct request_queue
*q
);
1207 extern void blk_post_runtime_suspend(struct request_queue
*q
, int err
);
1208 extern void blk_pre_runtime_resume(struct request_queue
*q
);
1209 extern void blk_post_runtime_resume(struct request_queue
*q
, int err
);
1210 extern void blk_set_runtime_active(struct request_queue
*q
);
1212 static inline void blk_pm_runtime_init(struct request_queue
*q
,
1213 struct device
*dev
) {}
1214 static inline int blk_pre_runtime_suspend(struct request_queue
*q
)
1218 static inline void blk_post_runtime_suspend(struct request_queue
*q
, int err
) {}
1219 static inline void blk_pre_runtime_resume(struct request_queue
*q
) {}
1220 static inline void blk_post_runtime_resume(struct request_queue
*q
, int err
) {}
1221 static inline void blk_set_runtime_active(struct request_queue
*q
) {}
1225 * blk_plug permits building a queue of related requests by holding the I/O
1226 * fragments for a short period. This allows merging of sequential requests
1227 * into single larger request. As the requests are moved from a per-task list to
1228 * the device's request_queue in a batch, this results in improved scalability
1229 * as the lock contention for request_queue lock is reduced.
1231 * It is ok not to disable preemption when adding the request to the plug list
1232 * or when attempting a merge, because blk_schedule_flush_list() will only flush
1233 * the plug list when the task sleeps by itself. For details, please see
1234 * schedule() where blk_schedule_flush_plug() is called.
1237 struct list_head list
; /* requests */
1238 struct list_head mq_list
; /* blk-mq requests */
1239 struct list_head cb_list
; /* md requires an unplug callback */
1241 #define BLK_MAX_REQUEST_COUNT 16
1242 #define BLK_PLUG_FLUSH_SIZE (128 * 1024)
1245 typedef void (*blk_plug_cb_fn
)(struct blk_plug_cb
*, bool);
1246 struct blk_plug_cb
{
1247 struct list_head list
;
1248 blk_plug_cb_fn callback
;
1251 extern struct blk_plug_cb
*blk_check_plugged(blk_plug_cb_fn unplug
,
1252 void *data
, int size
);
1253 extern void blk_start_plug(struct blk_plug
*);
1254 extern void blk_finish_plug(struct blk_plug
*);
1255 extern void blk_flush_plug_list(struct blk_plug
*, bool);
1257 static inline void blk_flush_plug(struct task_struct
*tsk
)
1259 struct blk_plug
*plug
= tsk
->plug
;
1262 blk_flush_plug_list(plug
, false);
1265 static inline void blk_schedule_flush_plug(struct task_struct
*tsk
)
1267 struct blk_plug
*plug
= tsk
->plug
;
1270 blk_flush_plug_list(plug
, true);
1273 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1275 struct blk_plug
*plug
= tsk
->plug
;
1278 (!list_empty(&plug
->list
) ||
1279 !list_empty(&plug
->mq_list
) ||
1280 !list_empty(&plug
->cb_list
));
1286 extern int blk_queue_start_tag(struct request_queue
*, struct request
*);
1287 extern struct request
*blk_queue_find_tag(struct request_queue
*, int);
1288 extern void blk_queue_end_tag(struct request_queue
*, struct request
*);
1289 extern int blk_queue_init_tags(struct request_queue
*, int, struct blk_queue_tag
*, int);
1290 extern void blk_queue_free_tags(struct request_queue
*);
1291 extern int blk_queue_resize_tags(struct request_queue
*, int);
1292 extern void blk_queue_invalidate_tags(struct request_queue
*);
1293 extern struct blk_queue_tag
*blk_init_tags(int, int);
1294 extern void blk_free_tags(struct blk_queue_tag
*);
1296 static inline struct request
*blk_map_queue_find_tag(struct blk_queue_tag
*bqt
,
1299 if (unlikely(bqt
== NULL
|| tag
>= bqt
->real_max_depth
))
1301 return bqt
->tag_index
[tag
];
1305 #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */
1306 #define BLKDEV_DISCARD_ZERO (1 << 1) /* must reliably zero data */
1308 extern int blkdev_issue_flush(struct block_device
*, gfp_t
, sector_t
*);
1309 extern int blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1310 sector_t nr_sects
, gfp_t gfp_mask
, unsigned long flags
);
1311 extern int __blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1312 sector_t nr_sects
, gfp_t gfp_mask
, int flags
,
1314 extern int blkdev_issue_write_same(struct block_device
*bdev
, sector_t sector
,
1315 sector_t nr_sects
, gfp_t gfp_mask
, struct page
*page
);
1316 extern int __blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1317 sector_t nr_sects
, gfp_t gfp_mask
, struct bio
**biop
,
1319 extern int blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1320 sector_t nr_sects
, gfp_t gfp_mask
, bool discard
);
1321 static inline int sb_issue_discard(struct super_block
*sb
, sector_t block
,
1322 sector_t nr_blocks
, gfp_t gfp_mask
, unsigned long flags
)
1324 return blkdev_issue_discard(sb
->s_bdev
, block
<< (sb
->s_blocksize_bits
- 9),
1325 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1328 static inline int sb_issue_zeroout(struct super_block
*sb
, sector_t block
,
1329 sector_t nr_blocks
, gfp_t gfp_mask
)
1331 return blkdev_issue_zeroout(sb
->s_bdev
,
1332 block
<< (sb
->s_blocksize_bits
- 9),
1333 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1337 extern int blk_verify_command(unsigned char *cmd
, fmode_t has_write_perm
);
1339 enum blk_default_limits
{
1340 BLK_MAX_SEGMENTS
= 128,
1341 BLK_SAFE_MAX_SECTORS
= 255,
1342 BLK_DEF_MAX_SECTORS
= 2560,
1343 BLK_MAX_SEGMENT_SIZE
= 65536,
1344 BLK_SEG_BOUNDARY_MASK
= 0xFFFFFFFFUL
,
1347 #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
1349 static inline unsigned long queue_bounce_pfn(struct request_queue
*q
)
1351 return q
->limits
.bounce_pfn
;
1354 static inline unsigned long queue_segment_boundary(struct request_queue
*q
)
1356 return q
->limits
.seg_boundary_mask
;
1359 static inline unsigned long queue_virt_boundary(struct request_queue
*q
)
1361 return q
->limits
.virt_boundary_mask
;
1364 static inline unsigned int queue_max_sectors(struct request_queue
*q
)
1366 return q
->limits
.max_sectors
;
1369 static inline unsigned int queue_max_hw_sectors(struct request_queue
*q
)
1371 return q
->limits
.max_hw_sectors
;
1374 static inline unsigned short queue_max_segments(struct request_queue
*q
)
1376 return q
->limits
.max_segments
;
1379 static inline unsigned int queue_max_segment_size(struct request_queue
*q
)
1381 return q
->limits
.max_segment_size
;
1384 static inline unsigned short queue_logical_block_size(struct request_queue
*q
)
1388 if (q
&& q
->limits
.logical_block_size
)
1389 retval
= q
->limits
.logical_block_size
;
1394 static inline unsigned short bdev_logical_block_size(struct block_device
*bdev
)
1396 return queue_logical_block_size(bdev_get_queue(bdev
));
1399 static inline unsigned int queue_physical_block_size(struct request_queue
*q
)
1401 return q
->limits
.physical_block_size
;
1404 static inline unsigned int bdev_physical_block_size(struct block_device
*bdev
)
1406 return queue_physical_block_size(bdev_get_queue(bdev
));
1409 static inline unsigned int queue_io_min(struct request_queue
*q
)
1411 return q
->limits
.io_min
;
1414 static inline int bdev_io_min(struct block_device
*bdev
)
1416 return queue_io_min(bdev_get_queue(bdev
));
1419 static inline unsigned int queue_io_opt(struct request_queue
*q
)
1421 return q
->limits
.io_opt
;
1424 static inline int bdev_io_opt(struct block_device
*bdev
)
1426 return queue_io_opt(bdev_get_queue(bdev
));
1429 static inline int queue_alignment_offset(struct request_queue
*q
)
1431 if (q
->limits
.misaligned
)
1434 return q
->limits
.alignment_offset
;
1437 static inline int queue_limit_alignment_offset(struct queue_limits
*lim
, sector_t sector
)
1439 unsigned int granularity
= max(lim
->physical_block_size
, lim
->io_min
);
1440 unsigned int alignment
= sector_div(sector
, granularity
>> 9) << 9;
1442 return (granularity
+ lim
->alignment_offset
- alignment
) % granularity
;
1445 static inline int bdev_alignment_offset(struct block_device
*bdev
)
1447 struct request_queue
*q
= bdev_get_queue(bdev
);
1449 if (q
->limits
.misaligned
)
1452 if (bdev
!= bdev
->bd_contains
)
1453 return bdev
->bd_part
->alignment_offset
;
1455 return q
->limits
.alignment_offset
;
1458 static inline int queue_discard_alignment(struct request_queue
*q
)
1460 if (q
->limits
.discard_misaligned
)
1463 return q
->limits
.discard_alignment
;
1466 static inline int queue_limit_discard_alignment(struct queue_limits
*lim
, sector_t sector
)
1468 unsigned int alignment
, granularity
, offset
;
1470 if (!lim
->max_discard_sectors
)
1473 /* Why are these in bytes, not sectors? */
1474 alignment
= lim
->discard_alignment
>> 9;
1475 granularity
= lim
->discard_granularity
>> 9;
1479 /* Offset of the partition start in 'granularity' sectors */
1480 offset
= sector_div(sector
, granularity
);
1482 /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1483 offset
= (granularity
+ alignment
- offset
) % granularity
;
1485 /* Turn it back into bytes, gaah */
1489 static inline int bdev_discard_alignment(struct block_device
*bdev
)
1491 struct request_queue
*q
= bdev_get_queue(bdev
);
1493 if (bdev
!= bdev
->bd_contains
)
1494 return bdev
->bd_part
->discard_alignment
;
1496 return q
->limits
.discard_alignment
;
1499 static inline unsigned int queue_discard_zeroes_data(struct request_queue
*q
)
1501 if (q
->limits
.max_discard_sectors
&& q
->limits
.discard_zeroes_data
== 1)
1507 static inline unsigned int bdev_discard_zeroes_data(struct block_device
*bdev
)
1509 return queue_discard_zeroes_data(bdev_get_queue(bdev
));
1512 static inline unsigned int bdev_write_same(struct block_device
*bdev
)
1514 struct request_queue
*q
= bdev_get_queue(bdev
);
1517 return q
->limits
.max_write_same_sectors
;
1522 static inline unsigned int bdev_write_zeroes_sectors(struct block_device
*bdev
)
1524 struct request_queue
*q
= bdev_get_queue(bdev
);
1527 return q
->limits
.max_write_zeroes_sectors
;
1532 static inline enum blk_zoned_model
bdev_zoned_model(struct block_device
*bdev
)
1534 struct request_queue
*q
= bdev_get_queue(bdev
);
1537 return blk_queue_zoned_model(q
);
1539 return BLK_ZONED_NONE
;
1542 static inline bool bdev_is_zoned(struct block_device
*bdev
)
1544 struct request_queue
*q
= bdev_get_queue(bdev
);
1547 return blk_queue_is_zoned(q
);
1552 static inline unsigned int bdev_zone_sectors(struct block_device
*bdev
)
1554 struct request_queue
*q
= bdev_get_queue(bdev
);
1557 return blk_queue_zone_sectors(q
);
1562 static inline int queue_dma_alignment(struct request_queue
*q
)
1564 return q
? q
->dma_alignment
: 511;
1567 static inline int blk_rq_aligned(struct request_queue
*q
, unsigned long addr
,
1570 unsigned int alignment
= queue_dma_alignment(q
) | q
->dma_pad_mask
;
1571 return !(addr
& alignment
) && !(len
& alignment
);
1574 /* assumes size > 256 */
1575 static inline unsigned int blksize_bits(unsigned int size
)
1577 unsigned int bits
= 8;
1581 } while (size
> 256);
1585 static inline unsigned int block_size(struct block_device
*bdev
)
1587 return bdev
->bd_block_size
;
1590 static inline bool queue_flush_queueable(struct request_queue
*q
)
1592 return !test_bit(QUEUE_FLAG_FLUSH_NQ
, &q
->queue_flags
);
1595 typedef struct {struct page
*v
;} Sector
;
1597 unsigned char *read_dev_sector(struct block_device
*, sector_t
, Sector
*);
1599 static inline void put_dev_sector(Sector p
)
1604 static inline bool __bvec_gap_to_prev(struct request_queue
*q
,
1605 struct bio_vec
*bprv
, unsigned int offset
)
1608 ((bprv
->bv_offset
+ bprv
->bv_len
) & queue_virt_boundary(q
));
1612 * Check if adding a bio_vec after bprv with offset would create a gap in
1613 * the SG list. Most drivers don't care about this, but some do.
1615 static inline bool bvec_gap_to_prev(struct request_queue
*q
,
1616 struct bio_vec
*bprv
, unsigned int offset
)
1618 if (!queue_virt_boundary(q
))
1620 return __bvec_gap_to_prev(q
, bprv
, offset
);
1623 static inline bool bio_will_gap(struct request_queue
*q
, struct bio
*prev
,
1626 if (bio_has_data(prev
) && queue_virt_boundary(q
)) {
1627 struct bio_vec pb
, nb
;
1629 bio_get_last_bvec(prev
, &pb
);
1630 bio_get_first_bvec(next
, &nb
);
1632 return __bvec_gap_to_prev(q
, &pb
, nb
.bv_offset
);
1638 static inline bool req_gap_back_merge(struct request
*req
, struct bio
*bio
)
1640 return bio_will_gap(req
->q
, req
->biotail
, bio
);
1643 static inline bool req_gap_front_merge(struct request
*req
, struct bio
*bio
)
1645 return bio_will_gap(req
->q
, bio
, req
->bio
);
1648 int kblockd_schedule_work(struct work_struct
*work
);
1649 int kblockd_schedule_work_on(int cpu
, struct work_struct
*work
);
1650 int kblockd_schedule_delayed_work(struct delayed_work
*dwork
, unsigned long delay
);
1651 int kblockd_schedule_delayed_work_on(int cpu
, struct delayed_work
*dwork
, unsigned long delay
);
1653 #ifdef CONFIG_BLK_CGROUP
1655 * This should not be using sched_clock(). A real patch is in progress
1656 * to fix this up, until that is in place we need to disable preemption
1657 * around sched_clock() in this function and set_io_start_time_ns().
1659 static inline void set_start_time_ns(struct request
*req
)
1662 req
->start_time_ns
= sched_clock();
1666 static inline void set_io_start_time_ns(struct request
*req
)
1669 req
->io_start_time_ns
= sched_clock();
1673 static inline uint64_t rq_start_time_ns(struct request
*req
)
1675 return req
->start_time_ns
;
1678 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1680 return req
->io_start_time_ns
;
1683 static inline void set_start_time_ns(struct request
*req
) {}
1684 static inline void set_io_start_time_ns(struct request
*req
) {}
1685 static inline uint64_t rq_start_time_ns(struct request
*req
)
1689 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1695 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1696 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1697 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1698 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1700 #if defined(CONFIG_BLK_DEV_INTEGRITY)
1702 enum blk_integrity_flags
{
1703 BLK_INTEGRITY_VERIFY
= 1 << 0,
1704 BLK_INTEGRITY_GENERATE
= 1 << 1,
1705 BLK_INTEGRITY_DEVICE_CAPABLE
= 1 << 2,
1706 BLK_INTEGRITY_IP_CHECKSUM
= 1 << 3,
1709 struct blk_integrity_iter
{
1713 unsigned int data_size
;
1714 unsigned short interval
;
1715 const char *disk_name
;
1718 typedef int (integrity_processing_fn
) (struct blk_integrity_iter
*);
1720 struct blk_integrity_profile
{
1721 integrity_processing_fn
*generate_fn
;
1722 integrity_processing_fn
*verify_fn
;
1726 extern void blk_integrity_register(struct gendisk
*, struct blk_integrity
*);
1727 extern void blk_integrity_unregister(struct gendisk
*);
1728 extern int blk_integrity_compare(struct gendisk
*, struct gendisk
*);
1729 extern int blk_rq_map_integrity_sg(struct request_queue
*, struct bio
*,
1730 struct scatterlist
*);
1731 extern int blk_rq_count_integrity_sg(struct request_queue
*, struct bio
*);
1732 extern bool blk_integrity_merge_rq(struct request_queue
*, struct request
*,
1734 extern bool blk_integrity_merge_bio(struct request_queue
*, struct request
*,
1737 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1739 struct blk_integrity
*bi
= &disk
->queue
->integrity
;
1748 struct blk_integrity
*bdev_get_integrity(struct block_device
*bdev
)
1750 return blk_get_integrity(bdev
->bd_disk
);
1753 static inline bool blk_integrity_rq(struct request
*rq
)
1755 return rq
->cmd_flags
& REQ_INTEGRITY
;
1758 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1761 q
->limits
.max_integrity_segments
= segs
;
1764 static inline unsigned short
1765 queue_max_integrity_segments(struct request_queue
*q
)
1767 return q
->limits
.max_integrity_segments
;
1770 static inline bool integrity_req_gap_back_merge(struct request
*req
,
1773 struct bio_integrity_payload
*bip
= bio_integrity(req
->bio
);
1774 struct bio_integrity_payload
*bip_next
= bio_integrity(next
);
1776 return bvec_gap_to_prev(req
->q
, &bip
->bip_vec
[bip
->bip_vcnt
- 1],
1777 bip_next
->bip_vec
[0].bv_offset
);
1780 static inline bool integrity_req_gap_front_merge(struct request
*req
,
1783 struct bio_integrity_payload
*bip
= bio_integrity(bio
);
1784 struct bio_integrity_payload
*bip_next
= bio_integrity(req
->bio
);
1786 return bvec_gap_to_prev(req
->q
, &bip
->bip_vec
[bip
->bip_vcnt
- 1],
1787 bip_next
->bip_vec
[0].bv_offset
);
1790 #else /* CONFIG_BLK_DEV_INTEGRITY */
1793 struct block_device
;
1795 struct blk_integrity
;
1797 static inline int blk_integrity_rq(struct request
*rq
)
1801 static inline int blk_rq_count_integrity_sg(struct request_queue
*q
,
1806 static inline int blk_rq_map_integrity_sg(struct request_queue
*q
,
1808 struct scatterlist
*s
)
1812 static inline struct blk_integrity
*bdev_get_integrity(struct block_device
*b
)
1816 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1820 static inline int blk_integrity_compare(struct gendisk
*a
, struct gendisk
*b
)
1824 static inline void blk_integrity_register(struct gendisk
*d
,
1825 struct blk_integrity
*b
)
1828 static inline void blk_integrity_unregister(struct gendisk
*d
)
1831 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1835 static inline unsigned short queue_max_integrity_segments(struct request_queue
*q
)
1839 static inline bool blk_integrity_merge_rq(struct request_queue
*rq
,
1845 static inline bool blk_integrity_merge_bio(struct request_queue
*rq
,
1852 static inline bool integrity_req_gap_back_merge(struct request
*req
,
1857 static inline bool integrity_req_gap_front_merge(struct request
*req
,
1863 #endif /* CONFIG_BLK_DEV_INTEGRITY */
1866 * struct blk_dax_ctl - control and output parameters for ->direct_access
1867 * @sector: (input) offset relative to a block_device
1868 * @addr: (output) kernel virtual address for @sector populated by driver
1869 * @pfn: (output) page frame number for @addr populated by driver
1870 * @size: (input) number of bytes requested
1872 struct blk_dax_ctl
{
1879 struct block_device_operations
{
1880 int (*open
) (struct block_device
*, fmode_t
);
1881 void (*release
) (struct gendisk
*, fmode_t
);
1882 int (*rw_page
)(struct block_device
*, sector_t
, struct page
*, bool);
1883 int (*ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1884 int (*compat_ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1885 long (*direct_access
)(struct block_device
*, sector_t
, void **, pfn_t
*,
1887 unsigned int (*check_events
) (struct gendisk
*disk
,
1888 unsigned int clearing
);
1889 /* ->media_changed() is DEPRECATED, use ->check_events() instead */
1890 int (*media_changed
) (struct gendisk
*);
1891 void (*unlock_native_capacity
) (struct gendisk
*);
1892 int (*revalidate_disk
) (struct gendisk
*);
1893 int (*getgeo
)(struct block_device
*, struct hd_geometry
*);
1894 /* this callback is with swap_lock and sometimes page table lock held */
1895 void (*swap_slot_free_notify
) (struct block_device
*, unsigned long);
1896 struct module
*owner
;
1897 const struct pr_ops
*pr_ops
;
1900 extern int __blkdev_driver_ioctl(struct block_device
*, fmode_t
, unsigned int,
1902 extern int bdev_read_page(struct block_device
*, sector_t
, struct page
*);
1903 extern int bdev_write_page(struct block_device
*, sector_t
, struct page
*,
1904 struct writeback_control
*);
1905 extern long bdev_direct_access(struct block_device
*, struct blk_dax_ctl
*);
1906 extern int bdev_dax_supported(struct super_block
*, int);
1907 extern bool bdev_dax_capable(struct block_device
*);
1908 #else /* CONFIG_BLOCK */
1910 struct block_device
;
1913 * stubs for when the block layer is configured out
1915 #define buffer_heads_over_limit 0
1917 static inline long nr_blockdev_pages(void)
1925 static inline void blk_start_plug(struct blk_plug
*plug
)
1929 static inline void blk_finish_plug(struct blk_plug
*plug
)
1933 static inline void blk_flush_plug(struct task_struct
*task
)
1937 static inline void blk_schedule_flush_plug(struct task_struct
*task
)
1942 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1947 static inline int blkdev_issue_flush(struct block_device
*bdev
, gfp_t gfp_mask
,
1948 sector_t
*error_sector
)
1953 #endif /* CONFIG_BLOCK */