1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_BLKDEV_H
3 #define _LINUX_BLKDEV_H
5 #include <linux/sched.h>
6 #include <linux/sched/clock.h>
10 #include <linux/major.h>
11 #include <linux/genhd.h>
12 #include <linux/list.h>
13 #include <linux/llist.h>
14 #include <linux/timer.h>
15 #include <linux/workqueue.h>
16 #include <linux/pagemap.h>
17 #include <linux/backing-dev-defs.h>
18 #include <linux/wait.h>
19 #include <linux/mempool.h>
20 #include <linux/pfn.h>
21 #include <linux/bio.h>
22 #include <linux/stringify.h>
23 #include <linux/gfp.h>
24 #include <linux/bsg.h>
25 #include <linux/smp.h>
26 #include <linux/rcupdate.h>
27 #include <linux/percpu-refcount.h>
28 #include <linux/scatterlist.h>
29 #include <linux/blkzoned.h>
32 struct scsi_ioctl_command
;
35 struct elevator_queue
;
41 struct blk_flush_queue
;
44 struct blk_queue_stats
;
45 struct blk_stat_callback
;
47 #define BLKDEV_MIN_RQ 4
48 #define BLKDEV_MAX_RQ 128 /* Default maximum */
50 /* Must be consistent with blk_mq_poll_stats_bkt() */
51 #define BLK_MQ_POLL_STATS_BKTS 16
53 /* Doing classic polling */
54 #define BLK_MQ_POLL_CLASSIC -1
57 * Maximum number of blkcg policies allowed to be registered concurrently.
58 * Defined here to simplify include dependency.
60 #define BLKCG_MAX_POLS 5
62 static inline int blk_validate_block_size(unsigned int bsize
)
64 if (bsize
< 512 || bsize
> PAGE_SIZE
|| !is_power_of_2(bsize
))
70 typedef void (rq_end_io_fn
)(struct request
*, blk_status_t
);
74 typedef __u32 __bitwise req_flags_t
;
76 /* elevator knows about this request */
77 #define RQF_SORTED ((__force req_flags_t)(1 << 0))
78 /* drive already may have started this one */
79 #define RQF_STARTED ((__force req_flags_t)(1 << 1))
80 /* may not be passed by ioscheduler */
81 #define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3))
82 /* request for flush sequence */
83 #define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4))
84 /* merge of different types, fail separately */
85 #define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5))
86 /* track inflight for MQ */
87 #define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6))
88 /* don't call prep for this one */
89 #define RQF_DONTPREP ((__force req_flags_t)(1 << 7))
90 /* set for "ide_preempt" requests and also for requests for which the SCSI
91 "quiesce" state must be ignored. */
92 #define RQF_PREEMPT ((__force req_flags_t)(1 << 8))
93 /* contains copies of user pages */
94 #define RQF_COPY_USER ((__force req_flags_t)(1 << 9))
95 /* vaguely specified driver internal error. Ignored by the block layer */
96 #define RQF_FAILED ((__force req_flags_t)(1 << 10))
97 /* don't warn about errors */
98 #define RQF_QUIET ((__force req_flags_t)(1 << 11))
99 /* elevator private data attached */
100 #define RQF_ELVPRIV ((__force req_flags_t)(1 << 12))
101 /* account into disk and partition IO statistics */
102 #define RQF_IO_STAT ((__force req_flags_t)(1 << 13))
103 /* request came from our alloc pool */
104 #define RQF_ALLOCED ((__force req_flags_t)(1 << 14))
105 /* runtime pm request */
106 #define RQF_PM ((__force req_flags_t)(1 << 15))
107 /* on IO scheduler merge hash */
108 #define RQF_HASHED ((__force req_flags_t)(1 << 16))
109 /* track IO completion time */
110 #define RQF_STATS ((__force req_flags_t)(1 << 17))
111 /* Look at ->special_vec for the actual data payload instead of the
113 #define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18))
114 /* The per-zone write lock is held for this request */
115 #define RQF_ZONE_WRITE_LOCKED ((__force req_flags_t)(1 << 19))
116 /* already slept for hybrid poll */
117 #define RQF_MQ_POLL_SLEPT ((__force req_flags_t)(1 << 20))
118 /* ->timeout has been called, don't expire again */
119 #define RQF_TIMED_OUT ((__force req_flags_t)(1 << 21))
121 /* flags that prevent us from merging requests: */
122 #define RQF_NOMERGE_FLAGS \
123 (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD)
126 * Request state for blk-mq.
135 * Try to put the fields that are referenced together in the same cacheline.
137 * If you modify this structure, make sure to update blk_rq_init() and
138 * especially blk_mq_rq_ctx_init() to take care of the added fields.
141 struct request_queue
*q
;
142 struct blk_mq_ctx
*mq_ctx
;
143 struct blk_mq_hw_ctx
*mq_hctx
;
145 unsigned int cmd_flags
; /* op and common flags */
146 req_flags_t rq_flags
;
151 /* the following two fields are internal, NEVER access directly */
152 unsigned int __data_len
; /* total data len */
153 sector_t __sector
; /* sector cursor */
158 struct list_head queuelist
;
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 #ifdef CONFIG_BLK_RQ_ALLOC_TIME
206 /* Time that the first bio started allocating this request. */
209 /* Time that this request was allocated for this IO. */
211 /* Time that I/O was submitted to the device. */
212 u64 io_start_time_ns
;
214 #ifdef CONFIG_BLK_WBT
215 unsigned short wbt_flags
;
218 * rq sectors used for blk stats. It has the same value
219 * with blk_rq_sectors(rq), except that it never be zeroed
222 unsigned short stats_sectors
;
225 * Number of scatter-gather DMA addr+len pairs after
226 * physical address coalescing is performed.
228 unsigned short nr_phys_segments
;
230 #if defined(CONFIG_BLK_DEV_INTEGRITY)
231 unsigned short nr_integrity_segments
;
234 unsigned short write_hint
;
235 unsigned short ioprio
;
237 unsigned int extra_len
; /* length of alignment and padding */
239 enum mq_rq_state state
;
242 unsigned int timeout
;
243 unsigned long deadline
;
246 struct __call_single_data csd
;
251 * completion callback.
253 rq_end_io_fn
*end_io
;
257 static inline bool blk_op_is_scsi(unsigned int op
)
259 return op
== REQ_OP_SCSI_IN
|| op
== REQ_OP_SCSI_OUT
;
262 static inline bool blk_op_is_private(unsigned int op
)
264 return op
== REQ_OP_DRV_IN
|| op
== REQ_OP_DRV_OUT
;
267 static inline bool blk_rq_is_scsi(struct request
*rq
)
269 return blk_op_is_scsi(req_op(rq
));
272 static inline bool blk_rq_is_private(struct request
*rq
)
274 return blk_op_is_private(req_op(rq
));
277 static inline bool blk_rq_is_passthrough(struct request
*rq
)
279 return blk_rq_is_scsi(rq
) || blk_rq_is_private(rq
);
282 static inline bool bio_is_passthrough(struct bio
*bio
)
284 unsigned op
= bio_op(bio
);
286 return blk_op_is_scsi(op
) || blk_op_is_private(op
);
289 static inline unsigned short req_get_ioprio(struct request
*req
)
294 #include <linux/elevator.h>
296 struct blk_queue_ctx
;
298 typedef blk_qc_t (make_request_fn
) (struct request_queue
*q
, struct bio
*bio
);
301 typedef int (dma_drain_needed_fn
)(struct request
*);
303 enum blk_eh_timer_return
{
304 BLK_EH_DONE
, /* drivers has completed the command */
305 BLK_EH_RESET_TIMER
, /* reset timer and try again */
308 enum blk_queue_state
{
313 #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */
314 #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */
316 #define BLK_SCSI_MAX_CMDS (256)
317 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
320 * Zoned block device models (zoned limit).
322 enum blk_zoned_model
{
323 BLK_ZONED_NONE
, /* Regular block device */
324 BLK_ZONED_HA
, /* Host-aware zoned block device */
325 BLK_ZONED_HM
, /* Host-managed zoned block device */
328 struct queue_limits
{
329 unsigned long bounce_pfn
;
330 unsigned long seg_boundary_mask
;
331 unsigned long virt_boundary_mask
;
333 unsigned int max_hw_sectors
;
334 unsigned int max_dev_sectors
;
335 unsigned int chunk_sectors
;
336 unsigned int max_sectors
;
337 unsigned int max_segment_size
;
338 unsigned int physical_block_size
;
339 unsigned int logical_block_size
;
340 unsigned int alignment_offset
;
343 unsigned int max_discard_sectors
;
344 unsigned int max_hw_discard_sectors
;
345 unsigned int max_write_same_sectors
;
346 unsigned int max_write_zeroes_sectors
;
347 unsigned int discard_granularity
;
348 unsigned int discard_alignment
;
350 unsigned short max_segments
;
351 unsigned short max_integrity_segments
;
352 unsigned short max_discard_segments
;
354 unsigned char misaligned
;
355 unsigned char discard_misaligned
;
356 unsigned char raid_partial_stripes_expensive
;
357 enum blk_zoned_model zoned
;
360 #ifdef CONFIG_BLK_DEV_ZONED
363 * Maximum number of zones to report with a single report zones command.
365 #define BLK_ZONED_REPORT_MAX_ZONES 8192U
367 extern unsigned int blkdev_nr_zones(struct block_device
*bdev
);
368 extern int blkdev_report_zones(struct block_device
*bdev
,
369 sector_t sector
, struct blk_zone
*zones
,
370 unsigned int *nr_zones
);
371 extern int blkdev_reset_zones(struct block_device
*bdev
, sector_t sectors
,
372 sector_t nr_sectors
, gfp_t gfp_mask
);
373 extern int blk_revalidate_disk_zones(struct gendisk
*disk
);
375 extern int blkdev_report_zones_ioctl(struct block_device
*bdev
, fmode_t mode
,
376 unsigned int cmd
, unsigned long arg
);
377 extern int blkdev_reset_zones_ioctl(struct block_device
*bdev
, fmode_t mode
,
378 unsigned int cmd
, unsigned long arg
);
380 #else /* CONFIG_BLK_DEV_ZONED */
382 static inline unsigned int blkdev_nr_zones(struct block_device
*bdev
)
387 static inline int blk_revalidate_disk_zones(struct gendisk
*disk
)
392 static inline int blkdev_report_zones_ioctl(struct block_device
*bdev
,
393 fmode_t mode
, unsigned int cmd
,
399 static inline int blkdev_reset_zones_ioctl(struct block_device
*bdev
,
400 fmode_t mode
, unsigned int cmd
,
406 #endif /* CONFIG_BLK_DEV_ZONED */
408 struct request_queue
{
409 struct request
*last_merge
;
410 struct elevator_queue
*elevator
;
412 struct blk_queue_stats
*stats
;
413 struct rq_qos
*rq_qos
;
415 make_request_fn
*make_request_fn
;
416 dma_drain_needed_fn
*dma_drain_needed
;
418 const struct blk_mq_ops
*mq_ops
;
421 struct blk_mq_ctx __percpu
*queue_ctx
;
422 unsigned int nr_queues
;
424 unsigned int queue_depth
;
426 /* hw dispatch queues */
427 struct blk_mq_hw_ctx
**queue_hw_ctx
;
428 unsigned int nr_hw_queues
;
430 struct backing_dev_info
*backing_dev_info
;
433 * The queue owner gets to use this for whatever they like.
434 * ll_rw_blk doesn't touch it.
439 * various queue flags, see QUEUE_* below
441 unsigned long queue_flags
;
443 * Number of contexts that have called blk_set_pm_only(). If this
444 * counter is above zero then only RQF_PM and RQF_PREEMPT requests are
450 * ida allocated id for this queue. Used to index queues from
456 * queue needs bounce pages for pages above this limit
460 spinlock_t queue_lock
;
470 struct kobject
*mq_kobj
;
472 #ifdef CONFIG_BLK_DEV_INTEGRITY
473 struct blk_integrity integrity
;
474 #endif /* CONFIG_BLK_DEV_INTEGRITY */
479 unsigned int nr_pending
;
485 unsigned long nr_requests
; /* Max # of requests */
487 unsigned int dma_drain_size
;
488 void *dma_drain_buffer
;
489 unsigned int dma_pad_mask
;
490 unsigned int dma_alignment
;
492 unsigned int rq_timeout
;
495 struct blk_stat_callback
*poll_cb
;
496 struct blk_rq_stat poll_stat
[BLK_MQ_POLL_STATS_BKTS
];
498 struct timer_list timeout
;
499 struct work_struct timeout_work
;
501 struct list_head icq_list
;
502 #ifdef CONFIG_BLK_CGROUP
503 DECLARE_BITMAP (blkcg_pols
, BLKCG_MAX_POLS
);
504 struct blkcg_gq
*root_blkg
;
505 struct list_head blkg_list
;
508 struct queue_limits limits
;
510 unsigned int required_elevator_features
;
512 #ifdef CONFIG_BLK_DEV_ZONED
514 * Zoned block device information for request dispatch control.
515 * nr_zones is the total number of zones of the device. This is always
516 * 0 for regular block devices. seq_zones_bitmap is a bitmap of nr_zones
517 * bits which indicates if a zone is conventional (bit clear) or
518 * sequential (bit set). seq_zones_wlock is a bitmap of nr_zones
519 * bits which indicates if a zone is write locked, that is, if a write
520 * request targeting the zone was dispatched. All three fields are
521 * initialized by the low level device driver (e.g. scsi/sd.c).
522 * Stacking drivers (device mappers) may or may not initialize
525 * Reads of this information must be protected with blk_queue_enter() /
526 * blk_queue_exit(). Modifying this information is only allowed while
527 * no requests are being processed. See also blk_mq_freeze_queue() and
528 * blk_mq_unfreeze_queue().
530 unsigned int nr_zones
;
531 unsigned long *seq_zones_bitmap
;
532 unsigned long *seq_zones_wlock
;
533 #endif /* CONFIG_BLK_DEV_ZONED */
538 unsigned int sg_timeout
;
539 unsigned int sg_reserved_size
;
541 #ifdef CONFIG_BLK_DEV_IO_TRACE
542 struct blk_trace __rcu
*blk_trace
;
543 struct mutex blk_trace_mutex
;
546 * for flush operations
548 struct blk_flush_queue
*fq
;
550 struct list_head requeue_list
;
551 spinlock_t requeue_lock
;
552 struct delayed_work requeue_work
;
554 struct mutex sysfs_lock
;
555 struct mutex sysfs_dir_lock
;
558 * for reusing dead hctx instance in case of updating
561 struct list_head unused_hctx_list
;
562 spinlock_t unused_hctx_lock
;
566 #if defined(CONFIG_BLK_DEV_BSG)
567 struct bsg_class_device bsg_dev
;
570 #ifdef CONFIG_BLK_DEV_THROTTLING
572 struct throtl_data
*td
;
574 struct rcu_head rcu_head
;
575 wait_queue_head_t mq_freeze_wq
;
577 * Protect concurrent access to q_usage_counter by
578 * percpu_ref_kill() and percpu_ref_reinit().
580 struct mutex mq_freeze_lock
;
581 struct percpu_ref q_usage_counter
;
583 struct blk_mq_tag_set
*tag_set
;
584 struct list_head tag_set_list
;
585 struct bio_set bio_split
;
587 #ifdef CONFIG_BLK_DEBUG_FS
588 struct dentry
*debugfs_dir
;
589 struct dentry
*sched_debugfs_dir
;
590 struct dentry
*rqos_debugfs_dir
;
593 bool mq_sysfs_init_done
;
597 struct work_struct release_work
;
599 #define BLK_MAX_WRITE_HINTS 5
600 u64 write_hints
[BLK_MAX_WRITE_HINTS
];
603 /* Keep blk_queue_flag_name[] in sync with the definitions below */
604 #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */
605 #define QUEUE_FLAG_DYING 1 /* queue being torn down */
606 #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */
607 #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */
608 #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */
609 #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */
610 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
611 #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */
612 #define QUEUE_FLAG_DISCARD 8 /* supports DISCARD */
613 #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */
614 #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */
615 #define QUEUE_FLAG_SECERASE 11 /* supports secure erase */
616 #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */
617 #define QUEUE_FLAG_DEAD 13 /* queue tear-down finished */
618 #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */
619 #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */
620 #define QUEUE_FLAG_WC 17 /* Write back caching */
621 #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */
622 #define QUEUE_FLAG_DAX 19 /* device supports DAX */
623 #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */
624 #define QUEUE_FLAG_POLL_STATS 21 /* collecting stats for hybrid polling */
625 #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */
626 #define QUEUE_FLAG_SCSI_PASSTHROUGH 23 /* queue supports SCSI commands */
627 #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */
628 #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */
629 #define QUEUE_FLAG_ZONE_RESETALL 26 /* supports Zone Reset All */
630 #define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */
632 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
633 (1 << QUEUE_FLAG_SAME_COMP))
635 void blk_queue_flag_set(unsigned int flag
, struct request_queue
*q
);
636 void blk_queue_flag_clear(unsigned int flag
, struct request_queue
*q
);
637 bool blk_queue_flag_test_and_set(unsigned int flag
, struct request_queue
*q
);
639 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
640 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
641 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
642 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
643 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
644 #define blk_queue_noxmerges(q) \
645 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
646 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
647 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
648 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
649 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
650 #define blk_queue_zone_resetall(q) \
651 test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags)
652 #define blk_queue_secure_erase(q) \
653 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
654 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
655 #define blk_queue_scsi_passthrough(q) \
656 test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags)
657 #define blk_queue_pci_p2pdma(q) \
658 test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags)
659 #ifdef CONFIG_BLK_RQ_ALLOC_TIME
660 #define blk_queue_rq_alloc_time(q) \
661 test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags)
663 #define blk_queue_rq_alloc_time(q) false
666 #define blk_noretry_request(rq) \
667 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
668 REQ_FAILFAST_DRIVER))
669 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
670 #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only)
671 #define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags)
672 #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags)
674 extern void blk_set_pm_only(struct request_queue
*q
);
675 extern void blk_clear_pm_only(struct request_queue
*q
);
677 static inline bool blk_account_rq(struct request
*rq
)
679 return (rq
->rq_flags
& RQF_STARTED
) && !blk_rq_is_passthrough(rq
);
682 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
684 #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ)
686 #define rq_dma_dir(rq) \
687 (op_is_write(req_op(rq)) ? DMA_TO_DEVICE : DMA_FROM_DEVICE)
689 #define dma_map_bvec(dev, bv, dir, attrs) \
690 dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \
693 static inline bool queue_is_mq(struct request_queue
*q
)
698 static inline enum blk_zoned_model
699 blk_queue_zoned_model(struct request_queue
*q
)
701 return q
->limits
.zoned
;
704 static inline bool blk_queue_is_zoned(struct request_queue
*q
)
706 switch (blk_queue_zoned_model(q
)) {
715 static inline sector_t
blk_queue_zone_sectors(struct request_queue
*q
)
717 return blk_queue_is_zoned(q
) ? q
->limits
.chunk_sectors
: 0;
720 #ifdef CONFIG_BLK_DEV_ZONED
721 static inline unsigned int blk_queue_nr_zones(struct request_queue
*q
)
723 return blk_queue_is_zoned(q
) ? q
->nr_zones
: 0;
726 static inline unsigned int blk_queue_zone_no(struct request_queue
*q
,
729 if (!blk_queue_is_zoned(q
))
731 return sector
>> ilog2(q
->limits
.chunk_sectors
);
734 static inline bool blk_queue_zone_is_seq(struct request_queue
*q
,
737 if (!blk_queue_is_zoned(q
) || !q
->seq_zones_bitmap
)
739 return test_bit(blk_queue_zone_no(q
, sector
), q
->seq_zones_bitmap
);
741 #else /* CONFIG_BLK_DEV_ZONED */
742 static inline unsigned int blk_queue_nr_zones(struct request_queue
*q
)
746 #endif /* CONFIG_BLK_DEV_ZONED */
748 static inline bool rq_is_sync(struct request
*rq
)
750 return op_is_sync(rq
->cmd_flags
);
753 static inline bool rq_mergeable(struct request
*rq
)
755 if (blk_rq_is_passthrough(rq
))
758 if (req_op(rq
) == REQ_OP_FLUSH
)
761 if (req_op(rq
) == REQ_OP_WRITE_ZEROES
)
764 if (rq
->cmd_flags
& REQ_NOMERGE_FLAGS
)
766 if (rq
->rq_flags
& RQF_NOMERGE_FLAGS
)
772 static inline bool blk_write_same_mergeable(struct bio
*a
, struct bio
*b
)
774 if (bio_page(a
) == bio_page(b
) &&
775 bio_offset(a
) == bio_offset(b
))
781 static inline unsigned int blk_queue_depth(struct request_queue
*q
)
784 return q
->queue_depth
;
786 return q
->nr_requests
;
789 extern unsigned long blk_max_low_pfn
, blk_max_pfn
;
792 * standard bounce addresses:
794 * BLK_BOUNCE_HIGH : bounce all highmem pages
795 * BLK_BOUNCE_ANY : don't bounce anything
796 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
799 #if BITS_PER_LONG == 32
800 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
802 #define BLK_BOUNCE_HIGH -1ULL
804 #define BLK_BOUNCE_ANY (-1ULL)
805 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
808 * default timeout for SG_IO if none specified
810 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
811 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
817 unsigned long offset
;
822 struct req_iterator
{
823 struct bvec_iter iter
;
827 /* This should not be used directly - use rq_for_each_segment */
828 #define for_each_bio(_bio) \
829 for (; _bio; _bio = _bio->bi_next)
830 #define __rq_for_each_bio(_bio, rq) \
832 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
834 #define rq_for_each_segment(bvl, _rq, _iter) \
835 __rq_for_each_bio(_iter.bio, _rq) \
836 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
838 #define rq_for_each_bvec(bvl, _rq, _iter) \
839 __rq_for_each_bio(_iter.bio, _rq) \
840 bio_for_each_bvec(bvl, _iter.bio, _iter.iter)
842 #define rq_iter_last(bvec, _iter) \
843 (_iter.bio->bi_next == NULL && \
844 bio_iter_last(bvec, _iter.iter))
846 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
847 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
849 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
850 extern void rq_flush_dcache_pages(struct request
*rq
);
852 static inline void rq_flush_dcache_pages(struct request
*rq
)
857 extern int blk_register_queue(struct gendisk
*disk
);
858 extern void blk_unregister_queue(struct gendisk
*disk
);
859 extern blk_qc_t
generic_make_request(struct bio
*bio
);
860 extern blk_qc_t
direct_make_request(struct bio
*bio
);
861 extern void blk_rq_init(struct request_queue
*q
, struct request
*rq
);
862 extern void blk_put_request(struct request
*);
863 extern struct request
*blk_get_request(struct request_queue
*, unsigned int op
,
864 blk_mq_req_flags_t flags
);
865 extern int blk_lld_busy(struct request_queue
*q
);
866 extern int blk_rq_prep_clone(struct request
*rq
, struct request
*rq_src
,
867 struct bio_set
*bs
, gfp_t gfp_mask
,
868 int (*bio_ctr
)(struct bio
*, struct bio
*, void *),
870 extern void blk_rq_unprep_clone(struct request
*rq
);
871 extern blk_status_t
blk_insert_cloned_request(struct request_queue
*q
,
873 extern int blk_rq_append_bio(struct request
*rq
, struct bio
**bio
);
874 extern void blk_queue_split(struct request_queue
*, struct bio
**);
875 extern int scsi_verify_blk_ioctl(struct block_device
*, unsigned int);
876 extern int scsi_cmd_blk_ioctl(struct block_device
*, fmode_t
,
877 unsigned int, void __user
*);
878 extern int scsi_cmd_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
879 unsigned int, void __user
*);
880 extern int sg_scsi_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
881 struct scsi_ioctl_command __user
*);
883 extern int blk_queue_enter(struct request_queue
*q
, blk_mq_req_flags_t flags
);
884 extern void blk_queue_exit(struct request_queue
*q
);
885 extern void blk_sync_queue(struct request_queue
*q
);
886 extern int blk_rq_map_user(struct request_queue
*, struct request
*,
887 struct rq_map_data
*, void __user
*, unsigned long,
889 extern int blk_rq_unmap_user(struct bio
*);
890 extern int blk_rq_map_kern(struct request_queue
*, struct request
*, void *, unsigned int, gfp_t
);
891 extern int blk_rq_map_user_iov(struct request_queue
*, struct request
*,
892 struct rq_map_data
*, const struct iov_iter
*,
894 extern void blk_execute_rq(struct request_queue
*, struct gendisk
*,
895 struct request
*, int);
896 extern void blk_execute_rq_nowait(struct request_queue
*, struct gendisk
*,
897 struct request
*, int, rq_end_io_fn
*);
899 /* Helper to convert REQ_OP_XXX to its string format XXX */
900 extern const char *blk_op_str(unsigned int op
);
902 int blk_status_to_errno(blk_status_t status
);
903 blk_status_t
errno_to_blk_status(int errno
);
905 int blk_poll(struct request_queue
*q
, blk_qc_t cookie
, bool spin
);
907 static inline struct request_queue
*bdev_get_queue(struct block_device
*bdev
)
909 return bdev
->bd_disk
->queue
; /* this is never NULL */
913 * The basic unit of block I/O is a sector. It is used in a number of contexts
914 * in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9
915 * bytes. Variables of type sector_t represent an offset or size that is a
916 * multiple of 512 bytes. Hence these two constants.
919 #define SECTOR_SHIFT 9
922 #define SECTOR_SIZE (1 << SECTOR_SHIFT)
926 * blk_rq_pos() : the current sector
927 * blk_rq_bytes() : bytes left in the entire request
928 * blk_rq_cur_bytes() : bytes left in the current segment
929 * blk_rq_err_bytes() : bytes left till the next error boundary
930 * blk_rq_sectors() : sectors left in the entire request
931 * blk_rq_cur_sectors() : sectors left in the current segment
932 * blk_rq_stats_sectors() : sectors of the entire request used for stats
934 static inline sector_t
blk_rq_pos(const struct request
*rq
)
939 static inline unsigned int blk_rq_bytes(const struct request
*rq
)
941 return rq
->__data_len
;
944 static inline int blk_rq_cur_bytes(const struct request
*rq
)
946 return rq
->bio
? bio_cur_bytes(rq
->bio
) : 0;
949 extern unsigned int blk_rq_err_bytes(const struct request
*rq
);
951 static inline unsigned int blk_rq_sectors(const struct request
*rq
)
953 return blk_rq_bytes(rq
) >> SECTOR_SHIFT
;
956 static inline unsigned int blk_rq_cur_sectors(const struct request
*rq
)
958 return blk_rq_cur_bytes(rq
) >> SECTOR_SHIFT
;
961 static inline unsigned int blk_rq_stats_sectors(const struct request
*rq
)
963 return rq
->stats_sectors
;
966 #ifdef CONFIG_BLK_DEV_ZONED
967 static inline unsigned int blk_rq_zone_no(struct request
*rq
)
969 return blk_queue_zone_no(rq
->q
, blk_rq_pos(rq
));
972 static inline unsigned int blk_rq_zone_is_seq(struct request
*rq
)
974 return blk_queue_zone_is_seq(rq
->q
, blk_rq_pos(rq
));
976 #endif /* CONFIG_BLK_DEV_ZONED */
979 * Some commands like WRITE SAME have a payload or data transfer size which
980 * is different from the size of the request. Any driver that supports such
981 * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to
982 * calculate the data transfer size.
984 static inline unsigned int blk_rq_payload_bytes(struct request
*rq
)
986 if (rq
->rq_flags
& RQF_SPECIAL_PAYLOAD
)
987 return rq
->special_vec
.bv_len
;
988 return blk_rq_bytes(rq
);
992 * Return the first full biovec in the request. The caller needs to check that
993 * there are any bvecs before calling this helper.
995 static inline struct bio_vec
req_bvec(struct request
*rq
)
997 if (rq
->rq_flags
& RQF_SPECIAL_PAYLOAD
)
998 return rq
->special_vec
;
999 return mp_bvec_iter_bvec(rq
->bio
->bi_io_vec
, rq
->bio
->bi_iter
);
1002 static inline unsigned int blk_queue_get_max_sectors(struct request_queue
*q
,
1005 if (unlikely(op
== REQ_OP_DISCARD
|| op
== REQ_OP_SECURE_ERASE
))
1006 return min(q
->limits
.max_discard_sectors
,
1007 UINT_MAX
>> SECTOR_SHIFT
);
1009 if (unlikely(op
== REQ_OP_WRITE_SAME
))
1010 return q
->limits
.max_write_same_sectors
;
1012 if (unlikely(op
== REQ_OP_WRITE_ZEROES
))
1013 return q
->limits
.max_write_zeroes_sectors
;
1015 return q
->limits
.max_sectors
;
1019 * Return maximum size of a request at given offset. Only valid for
1020 * file system requests.
1022 static inline unsigned int blk_max_size_offset(struct request_queue
*q
,
1025 if (!q
->limits
.chunk_sectors
)
1026 return q
->limits
.max_sectors
;
1028 return min(q
->limits
.max_sectors
, (unsigned int)(q
->limits
.chunk_sectors
-
1029 (offset
& (q
->limits
.chunk_sectors
- 1))));
1032 static inline unsigned int blk_rq_get_max_sectors(struct request
*rq
,
1035 struct request_queue
*q
= rq
->q
;
1037 if (blk_rq_is_passthrough(rq
))
1038 return q
->limits
.max_hw_sectors
;
1040 if (!q
->limits
.chunk_sectors
||
1041 req_op(rq
) == REQ_OP_DISCARD
||
1042 req_op(rq
) == REQ_OP_SECURE_ERASE
)
1043 return blk_queue_get_max_sectors(q
, req_op(rq
));
1045 return min(blk_max_size_offset(q
, offset
),
1046 blk_queue_get_max_sectors(q
, req_op(rq
)));
1049 static inline unsigned int blk_rq_count_bios(struct request
*rq
)
1051 unsigned int nr_bios
= 0;
1054 __rq_for_each_bio(bio
, rq
)
1060 void blk_steal_bios(struct bio_list
*list
, struct request
*rq
);
1063 * Request completion related functions.
1065 * blk_update_request() completes given number of bytes and updates
1066 * the request without completing it.
1068 extern bool blk_update_request(struct request
*rq
, blk_status_t error
,
1069 unsigned int nr_bytes
);
1071 extern void __blk_complete_request(struct request
*);
1072 extern void blk_abort_request(struct request
*);
1075 * Access functions for manipulating queue properties
1077 extern void blk_cleanup_queue(struct request_queue
*);
1078 extern void blk_queue_make_request(struct request_queue
*, make_request_fn
*);
1079 extern void blk_queue_bounce_limit(struct request_queue
*, u64
);
1080 extern void blk_queue_max_hw_sectors(struct request_queue
*, unsigned int);
1081 extern void blk_queue_chunk_sectors(struct request_queue
*, unsigned int);
1082 extern void blk_queue_max_segments(struct request_queue
*, unsigned short);
1083 extern void blk_queue_max_discard_segments(struct request_queue
*,
1085 extern void blk_queue_max_segment_size(struct request_queue
*, unsigned int);
1086 extern void blk_queue_max_discard_sectors(struct request_queue
*q
,
1087 unsigned int max_discard_sectors
);
1088 extern void blk_queue_max_write_same_sectors(struct request_queue
*q
,
1089 unsigned int max_write_same_sectors
);
1090 extern void blk_queue_max_write_zeroes_sectors(struct request_queue
*q
,
1091 unsigned int max_write_same_sectors
);
1092 extern void blk_queue_logical_block_size(struct request_queue
*, unsigned int);
1093 extern void blk_queue_physical_block_size(struct request_queue
*, unsigned int);
1094 extern void blk_queue_alignment_offset(struct request_queue
*q
,
1095 unsigned int alignment
);
1096 extern void blk_limits_io_min(struct queue_limits
*limits
, unsigned int min
);
1097 extern void blk_queue_io_min(struct request_queue
*q
, unsigned int min
);
1098 extern void blk_limits_io_opt(struct queue_limits
*limits
, unsigned int opt
);
1099 extern void blk_queue_io_opt(struct request_queue
*q
, unsigned int opt
);
1100 extern void blk_set_queue_depth(struct request_queue
*q
, unsigned int depth
);
1101 extern void blk_set_default_limits(struct queue_limits
*lim
);
1102 extern void blk_set_stacking_limits(struct queue_limits
*lim
);
1103 extern int blk_stack_limits(struct queue_limits
*t
, struct queue_limits
*b
,
1105 extern int bdev_stack_limits(struct queue_limits
*t
, struct block_device
*bdev
,
1107 extern void disk_stack_limits(struct gendisk
*disk
, struct block_device
*bdev
,
1109 extern void blk_queue_stack_limits(struct request_queue
*t
, struct request_queue
*b
);
1110 extern void blk_queue_update_dma_pad(struct request_queue
*, unsigned int);
1111 extern int blk_queue_dma_drain(struct request_queue
*q
,
1112 dma_drain_needed_fn
*dma_drain_needed
,
1113 void *buf
, unsigned int size
);
1114 extern void blk_queue_segment_boundary(struct request_queue
*, unsigned long);
1115 extern void blk_queue_virt_boundary(struct request_queue
*, unsigned long);
1116 extern void blk_queue_dma_alignment(struct request_queue
*, int);
1117 extern void blk_queue_update_dma_alignment(struct request_queue
*, int);
1118 extern void blk_queue_rq_timeout(struct request_queue
*, unsigned int);
1119 extern void blk_queue_write_cache(struct request_queue
*q
, bool enabled
, bool fua
);
1120 extern void blk_queue_required_elevator_features(struct request_queue
*q
,
1121 unsigned int features
);
1122 extern bool blk_queue_can_use_dma_map_merging(struct request_queue
*q
,
1123 struct device
*dev
);
1126 * Number of physical segments as sent to the device.
1128 * Normally this is the number of discontiguous data segments sent by the
1129 * submitter. But for data-less command like discard we might have no
1130 * actual data segments submitted, but the driver might have to add it's
1131 * own special payload. In that case we still return 1 here so that this
1132 * special payload will be mapped.
1134 static inline unsigned short blk_rq_nr_phys_segments(struct request
*rq
)
1136 if (rq
->rq_flags
& RQF_SPECIAL_PAYLOAD
)
1138 return rq
->nr_phys_segments
;
1142 * Number of discard segments (or ranges) the driver needs to fill in.
1143 * Each discard bio merged into a request is counted as one segment.
1145 static inline unsigned short blk_rq_nr_discard_segments(struct request
*rq
)
1147 return max_t(unsigned short, rq
->nr_phys_segments
, 1);
1150 extern int blk_rq_map_sg(struct request_queue
*, struct request
*, struct scatterlist
*);
1151 extern void blk_dump_rq_flags(struct request
*, char *);
1152 extern long nr_blockdev_pages(void);
1154 bool __must_check
blk_get_queue(struct request_queue
*);
1155 struct request_queue
*blk_alloc_queue(gfp_t
);
1156 struct request_queue
*blk_alloc_queue_node(gfp_t gfp_mask
, int node_id
);
1157 extern void blk_put_queue(struct request_queue
*);
1158 extern void blk_set_queue_dying(struct request_queue
*);
1161 * blk_plug permits building a queue of related requests by holding the I/O
1162 * fragments for a short period. This allows merging of sequential requests
1163 * into single larger request. As the requests are moved from a per-task list to
1164 * the device's request_queue in a batch, this results in improved scalability
1165 * as the lock contention for request_queue lock is reduced.
1167 * It is ok not to disable preemption when adding the request to the plug list
1168 * or when attempting a merge, because blk_schedule_flush_list() will only flush
1169 * the plug list when the task sleeps by itself. For details, please see
1170 * schedule() where blk_schedule_flush_plug() is called.
1173 struct list_head mq_list
; /* blk-mq requests */
1174 struct list_head cb_list
; /* md requires an unplug callback */
1175 unsigned short rq_count
;
1176 bool multiple_queues
;
1178 #define BLK_MAX_REQUEST_COUNT 16
1179 #define BLK_PLUG_FLUSH_SIZE (128 * 1024)
1182 typedef void (*blk_plug_cb_fn
)(struct blk_plug_cb
*, bool);
1183 struct blk_plug_cb
{
1184 struct list_head list
;
1185 blk_plug_cb_fn callback
;
1188 extern struct blk_plug_cb
*blk_check_plugged(blk_plug_cb_fn unplug
,
1189 void *data
, int size
);
1190 extern void blk_start_plug(struct blk_plug
*);
1191 extern void blk_finish_plug(struct blk_plug
*);
1192 extern void blk_flush_plug_list(struct blk_plug
*, bool);
1194 static inline void blk_flush_plug(struct task_struct
*tsk
)
1196 struct blk_plug
*plug
= tsk
->plug
;
1199 blk_flush_plug_list(plug
, false);
1202 static inline void blk_schedule_flush_plug(struct task_struct
*tsk
)
1204 struct blk_plug
*plug
= tsk
->plug
;
1207 blk_flush_plug_list(plug
, true);
1210 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1212 struct blk_plug
*plug
= tsk
->plug
;
1215 (!list_empty(&plug
->mq_list
) ||
1216 !list_empty(&plug
->cb_list
));
1219 extern int blkdev_issue_flush(struct block_device
*, gfp_t
, sector_t
*);
1220 extern int blkdev_issue_write_same(struct block_device
*bdev
, sector_t sector
,
1221 sector_t nr_sects
, gfp_t gfp_mask
, struct page
*page
);
1223 #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */
1225 extern int blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1226 sector_t nr_sects
, gfp_t gfp_mask
, unsigned long flags
);
1227 extern int __blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1228 sector_t nr_sects
, gfp_t gfp_mask
, int flags
,
1231 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
1232 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
1234 extern int __blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1235 sector_t nr_sects
, gfp_t gfp_mask
, struct bio
**biop
,
1237 extern int blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1238 sector_t nr_sects
, gfp_t gfp_mask
, unsigned flags
);
1240 static inline int sb_issue_discard(struct super_block
*sb
, sector_t block
,
1241 sector_t nr_blocks
, gfp_t gfp_mask
, unsigned long flags
)
1243 return blkdev_issue_discard(sb
->s_bdev
,
1244 block
<< (sb
->s_blocksize_bits
-
1246 nr_blocks
<< (sb
->s_blocksize_bits
-
1250 static inline int sb_issue_zeroout(struct super_block
*sb
, sector_t block
,
1251 sector_t nr_blocks
, gfp_t gfp_mask
)
1253 return blkdev_issue_zeroout(sb
->s_bdev
,
1254 block
<< (sb
->s_blocksize_bits
-
1256 nr_blocks
<< (sb
->s_blocksize_bits
-
1261 extern int blk_verify_command(unsigned char *cmd
, fmode_t mode
);
1263 enum blk_default_limits
{
1264 BLK_MAX_SEGMENTS
= 128,
1265 BLK_SAFE_MAX_SECTORS
= 255,
1266 BLK_DEF_MAX_SECTORS
= 2560,
1267 BLK_MAX_SEGMENT_SIZE
= 65536,
1268 BLK_SEG_BOUNDARY_MASK
= 0xFFFFFFFFUL
,
1271 static inline unsigned long queue_segment_boundary(const struct request_queue
*q
)
1273 return q
->limits
.seg_boundary_mask
;
1276 static inline unsigned long queue_virt_boundary(const struct request_queue
*q
)
1278 return q
->limits
.virt_boundary_mask
;
1281 static inline unsigned int queue_max_sectors(const struct request_queue
*q
)
1283 return q
->limits
.max_sectors
;
1286 static inline unsigned int queue_max_hw_sectors(const struct request_queue
*q
)
1288 return q
->limits
.max_hw_sectors
;
1291 static inline unsigned short queue_max_segments(const struct request_queue
*q
)
1293 return q
->limits
.max_segments
;
1296 static inline unsigned short queue_max_discard_segments(const struct request_queue
*q
)
1298 return q
->limits
.max_discard_segments
;
1301 static inline unsigned int queue_max_segment_size(const struct request_queue
*q
)
1303 return q
->limits
.max_segment_size
;
1306 static inline unsigned queue_logical_block_size(const struct request_queue
*q
)
1310 if (q
&& q
->limits
.logical_block_size
)
1311 retval
= q
->limits
.logical_block_size
;
1316 static inline unsigned int bdev_logical_block_size(struct block_device
*bdev
)
1318 return queue_logical_block_size(bdev_get_queue(bdev
));
1321 static inline unsigned int queue_physical_block_size(const struct request_queue
*q
)
1323 return q
->limits
.physical_block_size
;
1326 static inline unsigned int bdev_physical_block_size(struct block_device
*bdev
)
1328 return queue_physical_block_size(bdev_get_queue(bdev
));
1331 static inline unsigned int queue_io_min(const struct request_queue
*q
)
1333 return q
->limits
.io_min
;
1336 static inline int bdev_io_min(struct block_device
*bdev
)
1338 return queue_io_min(bdev_get_queue(bdev
));
1341 static inline unsigned int queue_io_opt(const struct request_queue
*q
)
1343 return q
->limits
.io_opt
;
1346 static inline int bdev_io_opt(struct block_device
*bdev
)
1348 return queue_io_opt(bdev_get_queue(bdev
));
1351 static inline int queue_alignment_offset(const struct request_queue
*q
)
1353 if (q
->limits
.misaligned
)
1356 return q
->limits
.alignment_offset
;
1359 static inline int queue_limit_alignment_offset(struct queue_limits
*lim
, sector_t sector
)
1361 unsigned int granularity
= max(lim
->physical_block_size
, lim
->io_min
);
1362 unsigned int alignment
= sector_div(sector
, granularity
>> SECTOR_SHIFT
)
1365 return (granularity
+ lim
->alignment_offset
- alignment
) % granularity
;
1368 static inline int bdev_alignment_offset(struct block_device
*bdev
)
1370 struct request_queue
*q
= bdev_get_queue(bdev
);
1372 if (q
->limits
.misaligned
)
1375 if (bdev
!= bdev
->bd_contains
)
1376 return bdev
->bd_part
->alignment_offset
;
1378 return q
->limits
.alignment_offset
;
1381 static inline int queue_discard_alignment(const struct request_queue
*q
)
1383 if (q
->limits
.discard_misaligned
)
1386 return q
->limits
.discard_alignment
;
1389 static inline int queue_limit_discard_alignment(struct queue_limits
*lim
, sector_t sector
)
1391 unsigned int alignment
, granularity
, offset
;
1393 if (!lim
->max_discard_sectors
)
1396 /* Why are these in bytes, not sectors? */
1397 alignment
= lim
->discard_alignment
>> SECTOR_SHIFT
;
1398 granularity
= lim
->discard_granularity
>> SECTOR_SHIFT
;
1402 /* Offset of the partition start in 'granularity' sectors */
1403 offset
= sector_div(sector
, granularity
);
1405 /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1406 offset
= (granularity
+ alignment
- offset
) % granularity
;
1408 /* Turn it back into bytes, gaah */
1409 return offset
<< SECTOR_SHIFT
;
1412 static inline int bdev_discard_alignment(struct block_device
*bdev
)
1414 struct request_queue
*q
= bdev_get_queue(bdev
);
1416 if (bdev
!= bdev
->bd_contains
)
1417 return bdev
->bd_part
->discard_alignment
;
1419 return q
->limits
.discard_alignment
;
1422 static inline unsigned int bdev_write_same(struct block_device
*bdev
)
1424 struct request_queue
*q
= bdev_get_queue(bdev
);
1427 return q
->limits
.max_write_same_sectors
;
1432 static inline unsigned int bdev_write_zeroes_sectors(struct block_device
*bdev
)
1434 struct request_queue
*q
= bdev_get_queue(bdev
);
1437 return q
->limits
.max_write_zeroes_sectors
;
1442 static inline enum blk_zoned_model
bdev_zoned_model(struct block_device
*bdev
)
1444 struct request_queue
*q
= bdev_get_queue(bdev
);
1447 return blk_queue_zoned_model(q
);
1449 return BLK_ZONED_NONE
;
1452 static inline bool bdev_is_zoned(struct block_device
*bdev
)
1454 struct request_queue
*q
= bdev_get_queue(bdev
);
1457 return blk_queue_is_zoned(q
);
1462 static inline sector_t
bdev_zone_sectors(struct block_device
*bdev
)
1464 struct request_queue
*q
= bdev_get_queue(bdev
);
1467 return blk_queue_zone_sectors(q
);
1471 static inline int queue_dma_alignment(const struct request_queue
*q
)
1473 return q
? q
->dma_alignment
: 511;
1476 static inline int blk_rq_aligned(struct request_queue
*q
, unsigned long addr
,
1479 unsigned int alignment
= queue_dma_alignment(q
) | q
->dma_pad_mask
;
1480 return !(addr
& alignment
) && !(len
& alignment
);
1483 /* assumes size > 256 */
1484 static inline unsigned int blksize_bits(unsigned int size
)
1486 unsigned int bits
= 8;
1490 } while (size
> 256);
1494 static inline unsigned int block_size(struct block_device
*bdev
)
1496 return bdev
->bd_block_size
;
1499 typedef struct {struct page
*v
;} Sector
;
1501 unsigned char *read_dev_sector(struct block_device
*, sector_t
, Sector
*);
1503 static inline void put_dev_sector(Sector p
)
1508 int kblockd_schedule_work(struct work_struct
*work
);
1509 int kblockd_schedule_work_on(int cpu
, struct work_struct
*work
);
1510 int kblockd_mod_delayed_work_on(int cpu
, struct delayed_work
*dwork
, unsigned long delay
);
1512 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1513 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1514 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1515 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1517 #if defined(CONFIG_BLK_DEV_INTEGRITY)
1519 enum blk_integrity_flags
{
1520 BLK_INTEGRITY_VERIFY
= 1 << 0,
1521 BLK_INTEGRITY_GENERATE
= 1 << 1,
1522 BLK_INTEGRITY_DEVICE_CAPABLE
= 1 << 2,
1523 BLK_INTEGRITY_IP_CHECKSUM
= 1 << 3,
1526 struct blk_integrity_iter
{
1530 unsigned int data_size
;
1531 unsigned short interval
;
1532 const char *disk_name
;
1535 typedef blk_status_t (integrity_processing_fn
) (struct blk_integrity_iter
*);
1536 typedef void (integrity_prepare_fn
) (struct request
*);
1537 typedef void (integrity_complete_fn
) (struct request
*, unsigned int);
1539 struct blk_integrity_profile
{
1540 integrity_processing_fn
*generate_fn
;
1541 integrity_processing_fn
*verify_fn
;
1542 integrity_prepare_fn
*prepare_fn
;
1543 integrity_complete_fn
*complete_fn
;
1547 extern void blk_integrity_register(struct gendisk
*, struct blk_integrity
*);
1548 extern void blk_integrity_unregister(struct gendisk
*);
1549 extern int blk_integrity_compare(struct gendisk
*, struct gendisk
*);
1550 extern int blk_rq_map_integrity_sg(struct request_queue
*, struct bio
*,
1551 struct scatterlist
*);
1552 extern int blk_rq_count_integrity_sg(struct request_queue
*, struct bio
*);
1553 extern bool blk_integrity_merge_rq(struct request_queue
*, struct request
*,
1555 extern bool blk_integrity_merge_bio(struct request_queue
*, struct request
*,
1558 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1560 struct blk_integrity
*bi
= &disk
->queue
->integrity
;
1569 struct blk_integrity
*bdev_get_integrity(struct block_device
*bdev
)
1571 return blk_get_integrity(bdev
->bd_disk
);
1574 static inline bool blk_integrity_rq(struct request
*rq
)
1576 return rq
->cmd_flags
& REQ_INTEGRITY
;
1579 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1582 q
->limits
.max_integrity_segments
= segs
;
1585 static inline unsigned short
1586 queue_max_integrity_segments(const struct request_queue
*q
)
1588 return q
->limits
.max_integrity_segments
;
1592 * bio_integrity_intervals - Return number of integrity intervals for a bio
1593 * @bi: blk_integrity profile for device
1594 * @sectors: Size of the bio in 512-byte sectors
1596 * Description: The block layer calculates everything in 512 byte
1597 * sectors but integrity metadata is done in terms of the data integrity
1598 * interval size of the storage device. Convert the block layer sectors
1599 * to the appropriate number of integrity intervals.
1601 static inline unsigned int bio_integrity_intervals(struct blk_integrity
*bi
,
1602 unsigned int sectors
)
1604 return sectors
>> (bi
->interval_exp
- 9);
1607 static inline unsigned int bio_integrity_bytes(struct blk_integrity
*bi
,
1608 unsigned int sectors
)
1610 return bio_integrity_intervals(bi
, sectors
) * bi
->tuple_size
;
1614 * Return the first bvec that contains integrity data. Only drivers that are
1615 * limited to a single integrity segment should use this helper.
1617 static inline struct bio_vec
*rq_integrity_vec(struct request
*rq
)
1619 if (WARN_ON_ONCE(queue_max_integrity_segments(rq
->q
) > 1))
1621 return rq
->bio
->bi_integrity
->bip_vec
;
1624 #else /* CONFIG_BLK_DEV_INTEGRITY */
1627 struct block_device
;
1629 struct blk_integrity
;
1631 static inline int blk_integrity_rq(struct request
*rq
)
1635 static inline int blk_rq_count_integrity_sg(struct request_queue
*q
,
1640 static inline int blk_rq_map_integrity_sg(struct request_queue
*q
,
1642 struct scatterlist
*s
)
1646 static inline struct blk_integrity
*bdev_get_integrity(struct block_device
*b
)
1650 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1654 static inline int blk_integrity_compare(struct gendisk
*a
, struct gendisk
*b
)
1658 static inline void blk_integrity_register(struct gendisk
*d
,
1659 struct blk_integrity
*b
)
1662 static inline void blk_integrity_unregister(struct gendisk
*d
)
1665 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1669 static inline unsigned short queue_max_integrity_segments(const struct request_queue
*q
)
1673 static inline bool blk_integrity_merge_rq(struct request_queue
*rq
,
1679 static inline bool blk_integrity_merge_bio(struct request_queue
*rq
,
1686 static inline unsigned int bio_integrity_intervals(struct blk_integrity
*bi
,
1687 unsigned int sectors
)
1692 static inline unsigned int bio_integrity_bytes(struct blk_integrity
*bi
,
1693 unsigned int sectors
)
1698 static inline struct bio_vec
*rq_integrity_vec(struct request
*rq
)
1703 #endif /* CONFIG_BLK_DEV_INTEGRITY */
1705 struct block_device_operations
{
1706 int (*open
) (struct block_device
*, fmode_t
);
1707 void (*release
) (struct gendisk
*, fmode_t
);
1708 int (*rw_page
)(struct block_device
*, sector_t
, struct page
*, unsigned int);
1709 int (*ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1710 int (*compat_ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1711 unsigned int (*check_events
) (struct gendisk
*disk
,
1712 unsigned int clearing
);
1713 /* ->media_changed() is DEPRECATED, use ->check_events() instead */
1714 int (*media_changed
) (struct gendisk
*);
1715 void (*unlock_native_capacity
) (struct gendisk
*);
1716 int (*revalidate_disk
) (struct gendisk
*);
1717 int (*getgeo
)(struct block_device
*, struct hd_geometry
*);
1718 /* this callback is with swap_lock and sometimes page table lock held */
1719 void (*swap_slot_free_notify
) (struct block_device
*, unsigned long);
1720 int (*report_zones
)(struct gendisk
*, sector_t sector
,
1721 struct blk_zone
*zones
, unsigned int *nr_zones
);
1722 struct module
*owner
;
1723 const struct pr_ops
*pr_ops
;
1726 extern int __blkdev_driver_ioctl(struct block_device
*, fmode_t
, unsigned int,
1728 extern int bdev_read_page(struct block_device
*, sector_t
, struct page
*);
1729 extern int bdev_write_page(struct block_device
*, sector_t
, struct page
*,
1730 struct writeback_control
*);
1732 #ifdef CONFIG_BLK_DEV_ZONED
1733 bool blk_req_needs_zone_write_lock(struct request
*rq
);
1734 void __blk_req_zone_write_lock(struct request
*rq
);
1735 void __blk_req_zone_write_unlock(struct request
*rq
);
1737 static inline void blk_req_zone_write_lock(struct request
*rq
)
1739 if (blk_req_needs_zone_write_lock(rq
))
1740 __blk_req_zone_write_lock(rq
);
1743 static inline void blk_req_zone_write_unlock(struct request
*rq
)
1745 if (rq
->rq_flags
& RQF_ZONE_WRITE_LOCKED
)
1746 __blk_req_zone_write_unlock(rq
);
1749 static inline bool blk_req_zone_is_write_locked(struct request
*rq
)
1751 return rq
->q
->seq_zones_wlock
&&
1752 test_bit(blk_rq_zone_no(rq
), rq
->q
->seq_zones_wlock
);
1755 static inline bool blk_req_can_dispatch_to_zone(struct request
*rq
)
1757 if (!blk_req_needs_zone_write_lock(rq
))
1759 return !blk_req_zone_is_write_locked(rq
);
1762 static inline bool blk_req_needs_zone_write_lock(struct request
*rq
)
1767 static inline void blk_req_zone_write_lock(struct request
*rq
)
1771 static inline void blk_req_zone_write_unlock(struct request
*rq
)
1774 static inline bool blk_req_zone_is_write_locked(struct request
*rq
)
1779 static inline bool blk_req_can_dispatch_to_zone(struct request
*rq
)
1783 #endif /* CONFIG_BLK_DEV_ZONED */
1785 #else /* CONFIG_BLOCK */
1787 struct block_device
;
1790 * stubs for when the block layer is configured out
1792 #define buffer_heads_over_limit 0
1794 static inline long nr_blockdev_pages(void)
1802 static inline void blk_start_plug(struct blk_plug
*plug
)
1806 static inline void blk_finish_plug(struct blk_plug
*plug
)
1810 static inline void blk_flush_plug(struct task_struct
*task
)
1814 static inline void blk_schedule_flush_plug(struct task_struct
*task
)
1819 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1824 static inline int blkdev_issue_flush(struct block_device
*bdev
, gfp_t gfp_mask
,
1825 sector_t
*error_sector
)
1830 #endif /* CONFIG_BLOCK */
1832 static inline void blk_wake_io_task(struct task_struct
*waiter
)
1835 * If we're polling, the task itself is doing the completions. For
1836 * that case, we don't need to signal a wakeup, it's enough to just
1837 * mark us as RUNNING.
1839 if (waiter
== current
)
1840 __set_current_state(TASK_RUNNING
);
1842 wake_up_process(waiter
);