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 typedef void (rq_end_io_fn
)(struct request
*, blk_status_t
);
66 typedef __u32 __bitwise req_flags_t
;
68 /* elevator knows about this request */
69 #define RQF_SORTED ((__force req_flags_t)(1 << 0))
70 /* drive already may have started this one */
71 #define RQF_STARTED ((__force req_flags_t)(1 << 1))
72 /* may not be passed by ioscheduler */
73 #define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3))
74 /* request for flush sequence */
75 #define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4))
76 /* merge of different types, fail separately */
77 #define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5))
78 /* track inflight for MQ */
79 #define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6))
80 /* don't call prep for this one */
81 #define RQF_DONTPREP ((__force req_flags_t)(1 << 7))
82 /* set for "ide_preempt" requests and also for requests for which the SCSI
83 "quiesce" state must be ignored. */
84 #define RQF_PREEMPT ((__force req_flags_t)(1 << 8))
85 /* contains copies of user pages */
86 #define RQF_COPY_USER ((__force req_flags_t)(1 << 9))
87 /* vaguely specified driver internal error. Ignored by the block layer */
88 #define RQF_FAILED ((__force req_flags_t)(1 << 10))
89 /* don't warn about errors */
90 #define RQF_QUIET ((__force req_flags_t)(1 << 11))
91 /* elevator private data attached */
92 #define RQF_ELVPRIV ((__force req_flags_t)(1 << 12))
93 /* account into disk and partition IO statistics */
94 #define RQF_IO_STAT ((__force req_flags_t)(1 << 13))
95 /* request came from our alloc pool */
96 #define RQF_ALLOCED ((__force req_flags_t)(1 << 14))
97 /* runtime pm request */
98 #define RQF_PM ((__force req_flags_t)(1 << 15))
99 /* on IO scheduler merge hash */
100 #define RQF_HASHED ((__force req_flags_t)(1 << 16))
101 /* track IO completion time */
102 #define RQF_STATS ((__force req_flags_t)(1 << 17))
103 /* Look at ->special_vec for the actual data payload instead of the
105 #define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18))
106 /* The per-zone write lock is held for this request */
107 #define RQF_ZONE_WRITE_LOCKED ((__force req_flags_t)(1 << 19))
108 /* already slept for hybrid poll */
109 #define RQF_MQ_POLL_SLEPT ((__force req_flags_t)(1 << 20))
110 /* ->timeout has been called, don't expire again */
111 #define RQF_TIMED_OUT ((__force req_flags_t)(1 << 21))
113 /* flags that prevent us from merging requests: */
114 #define RQF_NOMERGE_FLAGS \
115 (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD)
118 * Request state for blk-mq.
127 * Try to put the fields that are referenced together in the same cacheline.
129 * If you modify this structure, make sure to update blk_rq_init() and
130 * especially blk_mq_rq_ctx_init() to take care of the added fields.
133 struct request_queue
*q
;
134 struct blk_mq_ctx
*mq_ctx
;
135 struct blk_mq_hw_ctx
*mq_hctx
;
137 unsigned int cmd_flags
; /* op and common flags */
138 req_flags_t rq_flags
;
143 /* the following two fields are internal, NEVER access directly */
144 unsigned int __data_len
; /* total data len */
145 sector_t __sector
; /* sector cursor */
150 struct list_head queuelist
;
153 * The hash is used inside the scheduler, and killed once the
154 * request reaches the dispatch list. The ipi_list is only used
155 * to queue the request for softirq completion, which is long
156 * after the request has been unhashed (and even removed from
157 * the dispatch list).
160 struct hlist_node hash
; /* merge hash */
161 struct list_head ipi_list
;
165 * The rb_node is only used inside the io scheduler, requests
166 * are pruned when moved to the dispatch queue. So let the
167 * completion_data share space with the rb_node.
170 struct rb_node rb_node
; /* sort/lookup */
171 struct bio_vec special_vec
;
172 void *completion_data
;
173 int error_count
; /* for legacy drivers, don't use */
177 * Three pointers are available for the IO schedulers, if they need
178 * more they have to dynamically allocate it. Flush requests are
179 * never put on the IO scheduler. So let the flush fields share
180 * space with the elevator data.
190 struct list_head list
;
191 rq_end_io_fn
*saved_end_io
;
195 struct gendisk
*rq_disk
;
196 struct hd_struct
*part
;
197 /* Time that I/O was submitted to the kernel. */
199 /* Time that I/O was submitted to the device. */
200 u64 io_start_time_ns
;
202 #ifdef CONFIG_BLK_WBT
203 unsigned short wbt_flags
;
205 #ifdef CONFIG_BLK_DEV_THROTTLING_LOW
206 unsigned short throtl_size
;
210 * Number of scatter-gather DMA addr+len pairs after
211 * physical address coalescing is performed.
213 unsigned short nr_phys_segments
;
215 #if defined(CONFIG_BLK_DEV_INTEGRITY)
216 unsigned short nr_integrity_segments
;
219 unsigned short write_hint
;
220 unsigned short ioprio
;
222 unsigned int extra_len
; /* length of alignment and padding */
224 enum mq_rq_state state
;
227 unsigned int timeout
;
228 unsigned long deadline
;
231 struct __call_single_data csd
;
236 * completion callback.
238 rq_end_io_fn
*end_io
;
242 static inline bool blk_op_is_scsi(unsigned int op
)
244 return op
== REQ_OP_SCSI_IN
|| op
== REQ_OP_SCSI_OUT
;
247 static inline bool blk_op_is_private(unsigned int op
)
249 return op
== REQ_OP_DRV_IN
|| op
== REQ_OP_DRV_OUT
;
252 static inline bool blk_rq_is_scsi(struct request
*rq
)
254 return blk_op_is_scsi(req_op(rq
));
257 static inline bool blk_rq_is_private(struct request
*rq
)
259 return blk_op_is_private(req_op(rq
));
262 static inline bool blk_rq_is_passthrough(struct request
*rq
)
264 return blk_rq_is_scsi(rq
) || blk_rq_is_private(rq
);
267 static inline bool bio_is_passthrough(struct bio
*bio
)
269 unsigned op
= bio_op(bio
);
271 return blk_op_is_scsi(op
) || blk_op_is_private(op
);
274 static inline unsigned short req_get_ioprio(struct request
*req
)
279 #include <linux/elevator.h>
281 struct blk_queue_ctx
;
283 typedef blk_qc_t (make_request_fn
) (struct request_queue
*q
, struct bio
*bio
);
286 typedef int (dma_drain_needed_fn
)(struct request
*);
288 enum blk_eh_timer_return
{
289 BLK_EH_DONE
, /* drivers has completed the command */
290 BLK_EH_RESET_TIMER
, /* reset timer and try again */
293 enum blk_queue_state
{
298 #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */
299 #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */
301 #define BLK_SCSI_MAX_CMDS (256)
302 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
305 * Zoned block device models (zoned limit).
307 enum blk_zoned_model
{
308 BLK_ZONED_NONE
, /* Regular block device */
309 BLK_ZONED_HA
, /* Host-aware zoned block device */
310 BLK_ZONED_HM
, /* Host-managed zoned block device */
313 struct queue_limits
{
314 unsigned long bounce_pfn
;
315 unsigned long seg_boundary_mask
;
316 unsigned long virt_boundary_mask
;
318 unsigned int max_hw_sectors
;
319 unsigned int max_dev_sectors
;
320 unsigned int chunk_sectors
;
321 unsigned int max_sectors
;
322 unsigned int max_segment_size
;
323 unsigned int physical_block_size
;
324 unsigned int alignment_offset
;
327 unsigned int max_discard_sectors
;
328 unsigned int max_hw_discard_sectors
;
329 unsigned int max_write_same_sectors
;
330 unsigned int max_write_zeroes_sectors
;
331 unsigned int discard_granularity
;
332 unsigned int discard_alignment
;
334 unsigned short logical_block_size
;
335 unsigned short max_segments
;
336 unsigned short max_integrity_segments
;
337 unsigned short max_discard_segments
;
339 unsigned char misaligned
;
340 unsigned char discard_misaligned
;
341 unsigned char raid_partial_stripes_expensive
;
342 enum blk_zoned_model zoned
;
345 #ifdef CONFIG_BLK_DEV_ZONED
347 extern unsigned int blkdev_nr_zones(struct block_device
*bdev
);
348 extern int blkdev_report_zones(struct block_device
*bdev
,
349 sector_t sector
, struct blk_zone
*zones
,
350 unsigned int *nr_zones
, gfp_t gfp_mask
);
351 extern int blkdev_reset_zones(struct block_device
*bdev
, sector_t sectors
,
352 sector_t nr_sectors
, gfp_t gfp_mask
);
353 extern int blk_revalidate_disk_zones(struct gendisk
*disk
);
355 extern int blkdev_report_zones_ioctl(struct block_device
*bdev
, fmode_t mode
,
356 unsigned int cmd
, unsigned long arg
);
357 extern int blkdev_reset_zones_ioctl(struct block_device
*bdev
, fmode_t mode
,
358 unsigned int cmd
, unsigned long arg
);
360 #else /* CONFIG_BLK_DEV_ZONED */
362 static inline unsigned int blkdev_nr_zones(struct block_device
*bdev
)
367 static inline int blk_revalidate_disk_zones(struct gendisk
*disk
)
372 static inline int blkdev_report_zones_ioctl(struct block_device
*bdev
,
373 fmode_t mode
, unsigned int cmd
,
379 static inline int blkdev_reset_zones_ioctl(struct block_device
*bdev
,
380 fmode_t mode
, unsigned int cmd
,
386 #endif /* CONFIG_BLK_DEV_ZONED */
388 struct request_queue
{
390 * Together with queue_head for cacheline sharing
392 struct list_head queue_head
;
393 struct request
*last_merge
;
394 struct elevator_queue
*elevator
;
396 struct blk_queue_stats
*stats
;
397 struct rq_qos
*rq_qos
;
399 make_request_fn
*make_request_fn
;
400 dma_drain_needed_fn
*dma_drain_needed
;
402 const struct blk_mq_ops
*mq_ops
;
405 struct blk_mq_ctx __percpu
*queue_ctx
;
406 unsigned int nr_queues
;
408 unsigned int queue_depth
;
410 /* hw dispatch queues */
411 struct blk_mq_hw_ctx
**queue_hw_ctx
;
412 unsigned int nr_hw_queues
;
414 struct backing_dev_info
*backing_dev_info
;
417 * The queue owner gets to use this for whatever they like.
418 * ll_rw_blk doesn't touch it.
423 * various queue flags, see QUEUE_* below
425 unsigned long queue_flags
;
427 * Number of contexts that have called blk_set_pm_only(). If this
428 * counter is above zero then only RQF_PM and RQF_PREEMPT requests are
434 * ida allocated id for this queue. Used to index queues from
440 * queue needs bounce pages for pages above this limit
444 spinlock_t queue_lock
;
454 struct kobject
*mq_kobj
;
456 #ifdef CONFIG_BLK_DEV_INTEGRITY
457 struct blk_integrity integrity
;
458 #endif /* CONFIG_BLK_DEV_INTEGRITY */
463 unsigned int nr_pending
;
469 unsigned long nr_requests
; /* Max # of requests */
471 unsigned int dma_drain_size
;
472 void *dma_drain_buffer
;
473 unsigned int dma_pad_mask
;
474 unsigned int dma_alignment
;
476 unsigned int rq_timeout
;
479 struct blk_stat_callback
*poll_cb
;
480 struct blk_rq_stat poll_stat
[BLK_MQ_POLL_STATS_BKTS
];
482 struct timer_list timeout
;
483 struct work_struct timeout_work
;
485 struct list_head icq_list
;
486 #ifdef CONFIG_BLK_CGROUP
487 DECLARE_BITMAP (blkcg_pols
, BLKCG_MAX_POLS
);
488 struct blkcg_gq
*root_blkg
;
489 struct list_head blkg_list
;
492 struct queue_limits limits
;
494 #ifdef CONFIG_BLK_DEV_ZONED
496 * Zoned block device information for request dispatch control.
497 * nr_zones is the total number of zones of the device. This is always
498 * 0 for regular block devices. seq_zones_bitmap is a bitmap of nr_zones
499 * bits which indicates if a zone is conventional (bit clear) or
500 * sequential (bit set). seq_zones_wlock is a bitmap of nr_zones
501 * bits which indicates if a zone is write locked, that is, if a write
502 * request targeting the zone was dispatched. All three fields are
503 * initialized by the low level device driver (e.g. scsi/sd.c).
504 * Stacking drivers (device mappers) may or may not initialize
507 * Reads of this information must be protected with blk_queue_enter() /
508 * blk_queue_exit(). Modifying this information is only allowed while
509 * no requests are being processed. See also blk_mq_freeze_queue() and
510 * blk_mq_unfreeze_queue().
512 unsigned int nr_zones
;
513 unsigned long *seq_zones_bitmap
;
514 unsigned long *seq_zones_wlock
;
515 #endif /* CONFIG_BLK_DEV_ZONED */
520 unsigned int sg_timeout
;
521 unsigned int sg_reserved_size
;
523 #ifdef CONFIG_BLK_DEV_IO_TRACE
524 struct blk_trace
*blk_trace
;
525 struct mutex blk_trace_mutex
;
528 * for flush operations
530 struct blk_flush_queue
*fq
;
532 struct list_head requeue_list
;
533 spinlock_t requeue_lock
;
534 struct delayed_work requeue_work
;
536 struct mutex sysfs_lock
;
539 * for reusing dead hctx instance in case of updating
542 struct list_head unused_hctx_list
;
543 spinlock_t unused_hctx_lock
;
547 #if defined(CONFIG_BLK_DEV_BSG)
548 struct bsg_class_device bsg_dev
;
551 #ifdef CONFIG_BLK_DEV_THROTTLING
553 struct throtl_data
*td
;
555 struct rcu_head rcu_head
;
556 wait_queue_head_t mq_freeze_wq
;
558 * Protect concurrent access to q_usage_counter by
559 * percpu_ref_kill() and percpu_ref_reinit().
561 struct mutex mq_freeze_lock
;
562 struct percpu_ref q_usage_counter
;
564 struct blk_mq_tag_set
*tag_set
;
565 struct list_head tag_set_list
;
566 struct bio_set bio_split
;
568 #ifdef CONFIG_BLK_DEBUG_FS
569 struct dentry
*debugfs_dir
;
570 struct dentry
*sched_debugfs_dir
;
571 struct dentry
*rqos_debugfs_dir
;
574 bool mq_sysfs_init_done
;
578 struct work_struct release_work
;
580 #define BLK_MAX_WRITE_HINTS 5
581 u64 write_hints
[BLK_MAX_WRITE_HINTS
];
584 #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */
585 #define QUEUE_FLAG_DYING 1 /* queue being torn down */
586 #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */
587 #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */
588 #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */
589 #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */
590 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
591 #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */
592 #define QUEUE_FLAG_DISCARD 8 /* supports DISCARD */
593 #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */
594 #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */
595 #define QUEUE_FLAG_SECERASE 11 /* supports secure erase */
596 #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */
597 #define QUEUE_FLAG_DEAD 13 /* queue tear-down finished */
598 #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */
599 #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */
600 #define QUEUE_FLAG_WC 17 /* Write back caching */
601 #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */
602 #define QUEUE_FLAG_DAX 19 /* device supports DAX */
603 #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */
604 #define QUEUE_FLAG_POLL_STATS 21 /* collecting stats for hybrid polling */
605 #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */
606 #define QUEUE_FLAG_SCSI_PASSTHROUGH 23 /* queue supports SCSI commands */
607 #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */
608 #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */
610 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
611 (1 << QUEUE_FLAG_SAME_COMP))
613 void blk_queue_flag_set(unsigned int flag
, struct request_queue
*q
);
614 void blk_queue_flag_clear(unsigned int flag
, struct request_queue
*q
);
615 bool blk_queue_flag_test_and_set(unsigned int flag
, struct request_queue
*q
);
617 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
618 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
619 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
620 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
621 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
622 #define blk_queue_noxmerges(q) \
623 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
624 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
625 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
626 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
627 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
628 #define blk_queue_secure_erase(q) \
629 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
630 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
631 #define blk_queue_scsi_passthrough(q) \
632 test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags)
633 #define blk_queue_pci_p2pdma(q) \
634 test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags)
636 #define blk_noretry_request(rq) \
637 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
638 REQ_FAILFAST_DRIVER))
639 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
640 #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only)
641 #define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags)
643 extern void blk_set_pm_only(struct request_queue
*q
);
644 extern void blk_clear_pm_only(struct request_queue
*q
);
646 static inline bool blk_account_rq(struct request
*rq
)
648 return (rq
->rq_flags
& RQF_STARTED
) && !blk_rq_is_passthrough(rq
);
651 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
653 #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ)
655 #define rq_dma_dir(rq) \
656 (op_is_write(req_op(rq)) ? DMA_TO_DEVICE : DMA_FROM_DEVICE)
658 #define dma_map_bvec(dev, bv, dir, attrs) \
659 dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \
662 static inline bool queue_is_mq(struct request_queue
*q
)
667 static inline enum blk_zoned_model
668 blk_queue_zoned_model(struct request_queue
*q
)
670 return q
->limits
.zoned
;
673 static inline bool blk_queue_is_zoned(struct request_queue
*q
)
675 switch (blk_queue_zoned_model(q
)) {
684 static inline unsigned int blk_queue_zone_sectors(struct request_queue
*q
)
686 return blk_queue_is_zoned(q
) ? q
->limits
.chunk_sectors
: 0;
689 #ifdef CONFIG_BLK_DEV_ZONED
690 static inline unsigned int blk_queue_nr_zones(struct request_queue
*q
)
692 return blk_queue_is_zoned(q
) ? q
->nr_zones
: 0;
695 static inline unsigned int blk_queue_zone_no(struct request_queue
*q
,
698 if (!blk_queue_is_zoned(q
))
700 return sector
>> ilog2(q
->limits
.chunk_sectors
);
703 static inline bool blk_queue_zone_is_seq(struct request_queue
*q
,
706 if (!blk_queue_is_zoned(q
) || !q
->seq_zones_bitmap
)
708 return test_bit(blk_queue_zone_no(q
, sector
), q
->seq_zones_bitmap
);
710 #else /* CONFIG_BLK_DEV_ZONED */
711 static inline unsigned int blk_queue_nr_zones(struct request_queue
*q
)
715 #endif /* CONFIG_BLK_DEV_ZONED */
717 static inline bool rq_is_sync(struct request
*rq
)
719 return op_is_sync(rq
->cmd_flags
);
722 static inline bool rq_mergeable(struct request
*rq
)
724 if (blk_rq_is_passthrough(rq
))
727 if (req_op(rq
) == REQ_OP_FLUSH
)
730 if (req_op(rq
) == REQ_OP_WRITE_ZEROES
)
733 if (rq
->cmd_flags
& REQ_NOMERGE_FLAGS
)
735 if (rq
->rq_flags
& RQF_NOMERGE_FLAGS
)
741 static inline bool blk_write_same_mergeable(struct bio
*a
, struct bio
*b
)
743 if (bio_page(a
) == bio_page(b
) &&
744 bio_offset(a
) == bio_offset(b
))
750 static inline unsigned int blk_queue_depth(struct request_queue
*q
)
753 return q
->queue_depth
;
755 return q
->nr_requests
;
758 extern unsigned long blk_max_low_pfn
, blk_max_pfn
;
761 * standard bounce addresses:
763 * BLK_BOUNCE_HIGH : bounce all highmem pages
764 * BLK_BOUNCE_ANY : don't bounce anything
765 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
768 #if BITS_PER_LONG == 32
769 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
771 #define BLK_BOUNCE_HIGH -1ULL
773 #define BLK_BOUNCE_ANY (-1ULL)
774 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
777 * default timeout for SG_IO if none specified
779 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
780 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
786 unsigned long offset
;
791 struct req_iterator
{
792 struct bvec_iter iter
;
796 /* This should not be used directly - use rq_for_each_segment */
797 #define for_each_bio(_bio) \
798 for (; _bio; _bio = _bio->bi_next)
799 #define __rq_for_each_bio(_bio, rq) \
801 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
803 #define rq_for_each_segment(bvl, _rq, _iter) \
804 __rq_for_each_bio(_iter.bio, _rq) \
805 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
807 #define rq_for_each_bvec(bvl, _rq, _iter) \
808 __rq_for_each_bio(_iter.bio, _rq) \
809 bio_for_each_bvec(bvl, _iter.bio, _iter.iter)
811 #define rq_iter_last(bvec, _iter) \
812 (_iter.bio->bi_next == NULL && \
813 bio_iter_last(bvec, _iter.iter))
815 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
816 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
818 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
819 extern void rq_flush_dcache_pages(struct request
*rq
);
821 static inline void rq_flush_dcache_pages(struct request
*rq
)
826 extern int blk_register_queue(struct gendisk
*disk
);
827 extern void blk_unregister_queue(struct gendisk
*disk
);
828 extern blk_qc_t
generic_make_request(struct bio
*bio
);
829 extern blk_qc_t
direct_make_request(struct bio
*bio
);
830 extern void blk_rq_init(struct request_queue
*q
, struct request
*rq
);
831 extern void blk_put_request(struct request
*);
832 extern struct request
*blk_get_request(struct request_queue
*, unsigned int op
,
833 blk_mq_req_flags_t flags
);
834 extern int blk_lld_busy(struct request_queue
*q
);
835 extern int blk_rq_prep_clone(struct request
*rq
, struct request
*rq_src
,
836 struct bio_set
*bs
, gfp_t gfp_mask
,
837 int (*bio_ctr
)(struct bio
*, struct bio
*, void *),
839 extern void blk_rq_unprep_clone(struct request
*rq
);
840 extern blk_status_t
blk_insert_cloned_request(struct request_queue
*q
,
842 extern int blk_rq_append_bio(struct request
*rq
, struct bio
**bio
);
843 extern void blk_queue_split(struct request_queue
*, struct bio
**);
844 extern int scsi_verify_blk_ioctl(struct block_device
*, unsigned int);
845 extern int scsi_cmd_blk_ioctl(struct block_device
*, fmode_t
,
846 unsigned int, void __user
*);
847 extern int scsi_cmd_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
848 unsigned int, void __user
*);
849 extern int sg_scsi_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
850 struct scsi_ioctl_command __user
*);
852 extern int blk_queue_enter(struct request_queue
*q
, blk_mq_req_flags_t flags
);
853 extern void blk_queue_exit(struct request_queue
*q
);
854 extern void blk_sync_queue(struct request_queue
*q
);
855 extern int blk_rq_map_user(struct request_queue
*, struct request
*,
856 struct rq_map_data
*, void __user
*, unsigned long,
858 extern int blk_rq_unmap_user(struct bio
*);
859 extern int blk_rq_map_kern(struct request_queue
*, struct request
*, void *, unsigned int, gfp_t
);
860 extern int blk_rq_map_user_iov(struct request_queue
*, struct request
*,
861 struct rq_map_data
*, const struct iov_iter
*,
863 extern void blk_execute_rq(struct request_queue
*, struct gendisk
*,
864 struct request
*, int);
865 extern void blk_execute_rq_nowait(struct request_queue
*, struct gendisk
*,
866 struct request
*, int, rq_end_io_fn
*);
868 int blk_status_to_errno(blk_status_t status
);
869 blk_status_t
errno_to_blk_status(int errno
);
871 int blk_poll(struct request_queue
*q
, blk_qc_t cookie
, bool spin
);
873 static inline struct request_queue
*bdev_get_queue(struct block_device
*bdev
)
875 return bdev
->bd_disk
->queue
; /* this is never NULL */
879 * The basic unit of block I/O is a sector. It is used in a number of contexts
880 * in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9
881 * bytes. Variables of type sector_t represent an offset or size that is a
882 * multiple of 512 bytes. Hence these two constants.
885 #define SECTOR_SHIFT 9
888 #define SECTOR_SIZE (1 << SECTOR_SHIFT)
892 * blk_rq_pos() : the current sector
893 * blk_rq_bytes() : bytes left in the entire request
894 * blk_rq_cur_bytes() : bytes left in the current segment
895 * blk_rq_err_bytes() : bytes left till the next error boundary
896 * blk_rq_sectors() : sectors left in the entire request
897 * blk_rq_cur_sectors() : sectors left in the current segment
899 static inline sector_t
blk_rq_pos(const struct request
*rq
)
904 static inline unsigned int blk_rq_bytes(const struct request
*rq
)
906 return rq
->__data_len
;
909 static inline int blk_rq_cur_bytes(const struct request
*rq
)
911 return rq
->bio
? bio_cur_bytes(rq
->bio
) : 0;
914 extern unsigned int blk_rq_err_bytes(const struct request
*rq
);
916 static inline unsigned int blk_rq_sectors(const struct request
*rq
)
918 return blk_rq_bytes(rq
) >> SECTOR_SHIFT
;
921 static inline unsigned int blk_rq_cur_sectors(const struct request
*rq
)
923 return blk_rq_cur_bytes(rq
) >> SECTOR_SHIFT
;
926 #ifdef CONFIG_BLK_DEV_ZONED
927 static inline unsigned int blk_rq_zone_no(struct request
*rq
)
929 return blk_queue_zone_no(rq
->q
, blk_rq_pos(rq
));
932 static inline unsigned int blk_rq_zone_is_seq(struct request
*rq
)
934 return blk_queue_zone_is_seq(rq
->q
, blk_rq_pos(rq
));
936 #endif /* CONFIG_BLK_DEV_ZONED */
939 * Some commands like WRITE SAME have a payload or data transfer size which
940 * is different from the size of the request. Any driver that supports such
941 * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to
942 * calculate the data transfer size.
944 static inline unsigned int blk_rq_payload_bytes(struct request
*rq
)
946 if (rq
->rq_flags
& RQF_SPECIAL_PAYLOAD
)
947 return rq
->special_vec
.bv_len
;
948 return blk_rq_bytes(rq
);
952 * Return the first full biovec in the request. The caller needs to check that
953 * there are any bvecs before calling this helper.
955 static inline struct bio_vec
req_bvec(struct request
*rq
)
957 if (rq
->rq_flags
& RQF_SPECIAL_PAYLOAD
)
958 return rq
->special_vec
;
959 return mp_bvec_iter_bvec(rq
->bio
->bi_io_vec
, rq
->bio
->bi_iter
);
962 static inline unsigned int blk_queue_get_max_sectors(struct request_queue
*q
,
965 if (unlikely(op
== REQ_OP_DISCARD
|| op
== REQ_OP_SECURE_ERASE
))
966 return min(q
->limits
.max_discard_sectors
,
967 UINT_MAX
>> SECTOR_SHIFT
);
969 if (unlikely(op
== REQ_OP_WRITE_SAME
))
970 return q
->limits
.max_write_same_sectors
;
972 if (unlikely(op
== REQ_OP_WRITE_ZEROES
))
973 return q
->limits
.max_write_zeroes_sectors
;
975 return q
->limits
.max_sectors
;
979 * Return maximum size of a request at given offset. Only valid for
980 * file system requests.
982 static inline unsigned int blk_max_size_offset(struct request_queue
*q
,
985 if (!q
->limits
.chunk_sectors
)
986 return q
->limits
.max_sectors
;
988 return min(q
->limits
.max_sectors
, (unsigned int)(q
->limits
.chunk_sectors
-
989 (offset
& (q
->limits
.chunk_sectors
- 1))));
992 static inline unsigned int blk_rq_get_max_sectors(struct request
*rq
,
995 struct request_queue
*q
= rq
->q
;
997 if (blk_rq_is_passthrough(rq
))
998 return q
->limits
.max_hw_sectors
;
1000 if (!q
->limits
.chunk_sectors
||
1001 req_op(rq
) == REQ_OP_DISCARD
||
1002 req_op(rq
) == REQ_OP_SECURE_ERASE
)
1003 return blk_queue_get_max_sectors(q
, req_op(rq
));
1005 return min(blk_max_size_offset(q
, offset
),
1006 blk_queue_get_max_sectors(q
, req_op(rq
)));
1009 static inline unsigned int blk_rq_count_bios(struct request
*rq
)
1011 unsigned int nr_bios
= 0;
1014 __rq_for_each_bio(bio
, rq
)
1020 void blk_steal_bios(struct bio_list
*list
, struct request
*rq
);
1023 * Request completion related functions.
1025 * blk_update_request() completes given number of bytes and updates
1026 * the request without completing it.
1028 extern bool blk_update_request(struct request
*rq
, blk_status_t error
,
1029 unsigned int nr_bytes
);
1031 extern void __blk_complete_request(struct request
*);
1032 extern void blk_abort_request(struct request
*);
1035 * Access functions for manipulating queue properties
1037 extern void blk_cleanup_queue(struct request_queue
*);
1038 extern void blk_queue_make_request(struct request_queue
*, make_request_fn
*);
1039 extern void blk_queue_bounce_limit(struct request_queue
*, u64
);
1040 extern void blk_queue_max_hw_sectors(struct request_queue
*, unsigned int);
1041 extern void blk_queue_chunk_sectors(struct request_queue
*, unsigned int);
1042 extern void blk_queue_max_segments(struct request_queue
*, unsigned short);
1043 extern void blk_queue_max_discard_segments(struct request_queue
*,
1045 extern void blk_queue_max_segment_size(struct request_queue
*, unsigned int);
1046 extern void blk_queue_max_discard_sectors(struct request_queue
*q
,
1047 unsigned int max_discard_sectors
);
1048 extern void blk_queue_max_write_same_sectors(struct request_queue
*q
,
1049 unsigned int max_write_same_sectors
);
1050 extern void blk_queue_max_write_zeroes_sectors(struct request_queue
*q
,
1051 unsigned int max_write_same_sectors
);
1052 extern void blk_queue_logical_block_size(struct request_queue
*, unsigned short);
1053 extern void blk_queue_physical_block_size(struct request_queue
*, unsigned int);
1054 extern void blk_queue_alignment_offset(struct request_queue
*q
,
1055 unsigned int alignment
);
1056 extern void blk_limits_io_min(struct queue_limits
*limits
, unsigned int min
);
1057 extern void blk_queue_io_min(struct request_queue
*q
, unsigned int min
);
1058 extern void blk_limits_io_opt(struct queue_limits
*limits
, unsigned int opt
);
1059 extern void blk_queue_io_opt(struct request_queue
*q
, unsigned int opt
);
1060 extern void blk_set_queue_depth(struct request_queue
*q
, unsigned int depth
);
1061 extern void blk_set_default_limits(struct queue_limits
*lim
);
1062 extern void blk_set_stacking_limits(struct queue_limits
*lim
);
1063 extern int blk_stack_limits(struct queue_limits
*t
, struct queue_limits
*b
,
1065 extern int bdev_stack_limits(struct queue_limits
*t
, struct block_device
*bdev
,
1067 extern void disk_stack_limits(struct gendisk
*disk
, struct block_device
*bdev
,
1069 extern void blk_queue_stack_limits(struct request_queue
*t
, struct request_queue
*b
);
1070 extern void blk_queue_update_dma_pad(struct request_queue
*, unsigned int);
1071 extern int blk_queue_dma_drain(struct request_queue
*q
,
1072 dma_drain_needed_fn
*dma_drain_needed
,
1073 void *buf
, unsigned int size
);
1074 extern void blk_queue_segment_boundary(struct request_queue
*, unsigned long);
1075 extern void blk_queue_virt_boundary(struct request_queue
*, unsigned long);
1076 extern void blk_queue_dma_alignment(struct request_queue
*, int);
1077 extern void blk_queue_update_dma_alignment(struct request_queue
*, int);
1078 extern void blk_queue_rq_timeout(struct request_queue
*, unsigned int);
1079 extern void blk_queue_write_cache(struct request_queue
*q
, bool enabled
, bool fua
);
1082 * Number of physical segments as sent to the device.
1084 * Normally this is the number of discontiguous data segments sent by the
1085 * submitter. But for data-less command like discard we might have no
1086 * actual data segments submitted, but the driver might have to add it's
1087 * own special payload. In that case we still return 1 here so that this
1088 * special payload will be mapped.
1090 static inline unsigned short blk_rq_nr_phys_segments(struct request
*rq
)
1092 if (rq
->rq_flags
& RQF_SPECIAL_PAYLOAD
)
1094 return rq
->nr_phys_segments
;
1098 * Number of discard segments (or ranges) the driver needs to fill in.
1099 * Each discard bio merged into a request is counted as one segment.
1101 static inline unsigned short blk_rq_nr_discard_segments(struct request
*rq
)
1103 return max_t(unsigned short, rq
->nr_phys_segments
, 1);
1106 extern int blk_rq_map_sg(struct request_queue
*, struct request
*, struct scatterlist
*);
1107 extern void blk_dump_rq_flags(struct request
*, char *);
1108 extern long nr_blockdev_pages(void);
1110 bool __must_check
blk_get_queue(struct request_queue
*);
1111 struct request_queue
*blk_alloc_queue(gfp_t
);
1112 struct request_queue
*blk_alloc_queue_node(gfp_t gfp_mask
, int node_id
);
1113 extern void blk_put_queue(struct request_queue
*);
1114 extern void blk_set_queue_dying(struct request_queue
*);
1117 * blk_plug permits building a queue of related requests by holding the I/O
1118 * fragments for a short period. This allows merging of sequential requests
1119 * into single larger request. As the requests are moved from a per-task list to
1120 * the device's request_queue in a batch, this results in improved scalability
1121 * as the lock contention for request_queue lock is reduced.
1123 * It is ok not to disable preemption when adding the request to the plug list
1124 * or when attempting a merge, because blk_schedule_flush_list() will only flush
1125 * the plug list when the task sleeps by itself. For details, please see
1126 * schedule() where blk_schedule_flush_plug() is called.
1129 struct list_head mq_list
; /* blk-mq requests */
1130 struct list_head cb_list
; /* md requires an unplug callback */
1131 unsigned short rq_count
;
1132 bool multiple_queues
;
1134 #define BLK_MAX_REQUEST_COUNT 16
1135 #define BLK_PLUG_FLUSH_SIZE (128 * 1024)
1138 typedef void (*blk_plug_cb_fn
)(struct blk_plug_cb
*, bool);
1139 struct blk_plug_cb
{
1140 struct list_head list
;
1141 blk_plug_cb_fn callback
;
1144 extern struct blk_plug_cb
*blk_check_plugged(blk_plug_cb_fn unplug
,
1145 void *data
, int size
);
1146 extern void blk_start_plug(struct blk_plug
*);
1147 extern void blk_finish_plug(struct blk_plug
*);
1148 extern void blk_flush_plug_list(struct blk_plug
*, bool);
1150 static inline void blk_flush_plug(struct task_struct
*tsk
)
1152 struct blk_plug
*plug
= tsk
->plug
;
1155 blk_flush_plug_list(plug
, false);
1158 static inline void blk_schedule_flush_plug(struct task_struct
*tsk
)
1160 struct blk_plug
*plug
= tsk
->plug
;
1163 blk_flush_plug_list(plug
, true);
1166 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1168 struct blk_plug
*plug
= tsk
->plug
;
1171 (!list_empty(&plug
->mq_list
) ||
1172 !list_empty(&plug
->cb_list
));
1175 extern int blkdev_issue_flush(struct block_device
*, gfp_t
, sector_t
*);
1176 extern int blkdev_issue_write_same(struct block_device
*bdev
, sector_t sector
,
1177 sector_t nr_sects
, gfp_t gfp_mask
, struct page
*page
);
1179 #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */
1181 extern int blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1182 sector_t nr_sects
, gfp_t gfp_mask
, unsigned long flags
);
1183 extern int __blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1184 sector_t nr_sects
, gfp_t gfp_mask
, int flags
,
1187 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
1188 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
1190 extern int __blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1191 sector_t nr_sects
, gfp_t gfp_mask
, struct bio
**biop
,
1193 extern int blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1194 sector_t nr_sects
, gfp_t gfp_mask
, unsigned flags
);
1196 static inline int sb_issue_discard(struct super_block
*sb
, sector_t block
,
1197 sector_t nr_blocks
, gfp_t gfp_mask
, unsigned long flags
)
1199 return blkdev_issue_discard(sb
->s_bdev
,
1200 block
<< (sb
->s_blocksize_bits
-
1202 nr_blocks
<< (sb
->s_blocksize_bits
-
1206 static inline int sb_issue_zeroout(struct super_block
*sb
, sector_t block
,
1207 sector_t nr_blocks
, gfp_t gfp_mask
)
1209 return blkdev_issue_zeroout(sb
->s_bdev
,
1210 block
<< (sb
->s_blocksize_bits
-
1212 nr_blocks
<< (sb
->s_blocksize_bits
-
1217 extern int blk_verify_command(unsigned char *cmd
, fmode_t mode
);
1219 enum blk_default_limits
{
1220 BLK_MAX_SEGMENTS
= 128,
1221 BLK_SAFE_MAX_SECTORS
= 255,
1222 BLK_DEF_MAX_SECTORS
= 2560,
1223 BLK_MAX_SEGMENT_SIZE
= 65536,
1224 BLK_SEG_BOUNDARY_MASK
= 0xFFFFFFFFUL
,
1227 static inline unsigned long queue_segment_boundary(struct request_queue
*q
)
1229 return q
->limits
.seg_boundary_mask
;
1232 static inline unsigned long queue_virt_boundary(struct request_queue
*q
)
1234 return q
->limits
.virt_boundary_mask
;
1237 static inline unsigned int queue_max_sectors(struct request_queue
*q
)
1239 return q
->limits
.max_sectors
;
1242 static inline unsigned int queue_max_hw_sectors(struct request_queue
*q
)
1244 return q
->limits
.max_hw_sectors
;
1247 static inline unsigned short queue_max_segments(struct request_queue
*q
)
1249 return q
->limits
.max_segments
;
1252 static inline unsigned short queue_max_discard_segments(struct request_queue
*q
)
1254 return q
->limits
.max_discard_segments
;
1257 static inline unsigned int queue_max_segment_size(struct request_queue
*q
)
1259 return q
->limits
.max_segment_size
;
1262 static inline unsigned short queue_logical_block_size(struct request_queue
*q
)
1266 if (q
&& q
->limits
.logical_block_size
)
1267 retval
= q
->limits
.logical_block_size
;
1272 static inline unsigned short bdev_logical_block_size(struct block_device
*bdev
)
1274 return queue_logical_block_size(bdev_get_queue(bdev
));
1277 static inline unsigned int queue_physical_block_size(struct request_queue
*q
)
1279 return q
->limits
.physical_block_size
;
1282 static inline unsigned int bdev_physical_block_size(struct block_device
*bdev
)
1284 return queue_physical_block_size(bdev_get_queue(bdev
));
1287 static inline unsigned int queue_io_min(struct request_queue
*q
)
1289 return q
->limits
.io_min
;
1292 static inline int bdev_io_min(struct block_device
*bdev
)
1294 return queue_io_min(bdev_get_queue(bdev
));
1297 static inline unsigned int queue_io_opt(struct request_queue
*q
)
1299 return q
->limits
.io_opt
;
1302 static inline int bdev_io_opt(struct block_device
*bdev
)
1304 return queue_io_opt(bdev_get_queue(bdev
));
1307 static inline int queue_alignment_offset(struct request_queue
*q
)
1309 if (q
->limits
.misaligned
)
1312 return q
->limits
.alignment_offset
;
1315 static inline int queue_limit_alignment_offset(struct queue_limits
*lim
, sector_t sector
)
1317 unsigned int granularity
= max(lim
->physical_block_size
, lim
->io_min
);
1318 unsigned int alignment
= sector_div(sector
, granularity
>> SECTOR_SHIFT
)
1321 return (granularity
+ lim
->alignment_offset
- alignment
) % granularity
;
1324 static inline int bdev_alignment_offset(struct block_device
*bdev
)
1326 struct request_queue
*q
= bdev_get_queue(bdev
);
1328 if (q
->limits
.misaligned
)
1331 if (bdev
!= bdev
->bd_contains
)
1332 return bdev
->bd_part
->alignment_offset
;
1334 return q
->limits
.alignment_offset
;
1337 static inline int queue_discard_alignment(struct request_queue
*q
)
1339 if (q
->limits
.discard_misaligned
)
1342 return q
->limits
.discard_alignment
;
1345 static inline int queue_limit_discard_alignment(struct queue_limits
*lim
, sector_t sector
)
1347 unsigned int alignment
, granularity
, offset
;
1349 if (!lim
->max_discard_sectors
)
1352 /* Why are these in bytes, not sectors? */
1353 alignment
= lim
->discard_alignment
>> SECTOR_SHIFT
;
1354 granularity
= lim
->discard_granularity
>> SECTOR_SHIFT
;
1358 /* Offset of the partition start in 'granularity' sectors */
1359 offset
= sector_div(sector
, granularity
);
1361 /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1362 offset
= (granularity
+ alignment
- offset
) % granularity
;
1364 /* Turn it back into bytes, gaah */
1365 return offset
<< SECTOR_SHIFT
;
1368 static inline int bdev_discard_alignment(struct block_device
*bdev
)
1370 struct request_queue
*q
= bdev_get_queue(bdev
);
1372 if (bdev
!= bdev
->bd_contains
)
1373 return bdev
->bd_part
->discard_alignment
;
1375 return q
->limits
.discard_alignment
;
1378 static inline unsigned int bdev_write_same(struct block_device
*bdev
)
1380 struct request_queue
*q
= bdev_get_queue(bdev
);
1383 return q
->limits
.max_write_same_sectors
;
1388 static inline unsigned int bdev_write_zeroes_sectors(struct block_device
*bdev
)
1390 struct request_queue
*q
= bdev_get_queue(bdev
);
1393 return q
->limits
.max_write_zeroes_sectors
;
1398 static inline enum blk_zoned_model
bdev_zoned_model(struct block_device
*bdev
)
1400 struct request_queue
*q
= bdev_get_queue(bdev
);
1403 return blk_queue_zoned_model(q
);
1405 return BLK_ZONED_NONE
;
1408 static inline bool bdev_is_zoned(struct block_device
*bdev
)
1410 struct request_queue
*q
= bdev_get_queue(bdev
);
1413 return blk_queue_is_zoned(q
);
1418 static inline unsigned int bdev_zone_sectors(struct block_device
*bdev
)
1420 struct request_queue
*q
= bdev_get_queue(bdev
);
1423 return blk_queue_zone_sectors(q
);
1427 static inline int queue_dma_alignment(struct request_queue
*q
)
1429 return q
? q
->dma_alignment
: 511;
1432 static inline int blk_rq_aligned(struct request_queue
*q
, unsigned long addr
,
1435 unsigned int alignment
= queue_dma_alignment(q
) | q
->dma_pad_mask
;
1436 return !(addr
& alignment
) && !(len
& alignment
);
1439 /* assumes size > 256 */
1440 static inline unsigned int blksize_bits(unsigned int size
)
1442 unsigned int bits
= 8;
1446 } while (size
> 256);
1450 static inline unsigned int block_size(struct block_device
*bdev
)
1452 return bdev
->bd_block_size
;
1455 typedef struct {struct page
*v
;} Sector
;
1457 unsigned char *read_dev_sector(struct block_device
*, sector_t
, Sector
*);
1459 static inline void put_dev_sector(Sector p
)
1464 int kblockd_schedule_work(struct work_struct
*work
);
1465 int kblockd_schedule_work_on(int cpu
, struct work_struct
*work
);
1466 int kblockd_mod_delayed_work_on(int cpu
, struct delayed_work
*dwork
, unsigned long delay
);
1468 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1469 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1470 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1471 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1473 #if defined(CONFIG_BLK_DEV_INTEGRITY)
1475 enum blk_integrity_flags
{
1476 BLK_INTEGRITY_VERIFY
= 1 << 0,
1477 BLK_INTEGRITY_GENERATE
= 1 << 1,
1478 BLK_INTEGRITY_DEVICE_CAPABLE
= 1 << 2,
1479 BLK_INTEGRITY_IP_CHECKSUM
= 1 << 3,
1482 struct blk_integrity_iter
{
1486 unsigned int data_size
;
1487 unsigned short interval
;
1488 const char *disk_name
;
1491 typedef blk_status_t (integrity_processing_fn
) (struct blk_integrity_iter
*);
1493 struct blk_integrity_profile
{
1494 integrity_processing_fn
*generate_fn
;
1495 integrity_processing_fn
*verify_fn
;
1499 extern void blk_integrity_register(struct gendisk
*, struct blk_integrity
*);
1500 extern void blk_integrity_unregister(struct gendisk
*);
1501 extern int blk_integrity_compare(struct gendisk
*, struct gendisk
*);
1502 extern int blk_rq_map_integrity_sg(struct request_queue
*, struct bio
*,
1503 struct scatterlist
*);
1504 extern int blk_rq_count_integrity_sg(struct request_queue
*, struct bio
*);
1505 extern bool blk_integrity_merge_rq(struct request_queue
*, struct request
*,
1507 extern bool blk_integrity_merge_bio(struct request_queue
*, struct request
*,
1510 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1512 struct blk_integrity
*bi
= &disk
->queue
->integrity
;
1521 struct blk_integrity
*bdev_get_integrity(struct block_device
*bdev
)
1523 return blk_get_integrity(bdev
->bd_disk
);
1526 static inline bool blk_integrity_rq(struct request
*rq
)
1528 return rq
->cmd_flags
& REQ_INTEGRITY
;
1531 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1534 q
->limits
.max_integrity_segments
= segs
;
1537 static inline unsigned short
1538 queue_max_integrity_segments(struct request_queue
*q
)
1540 return q
->limits
.max_integrity_segments
;
1544 * bio_integrity_intervals - Return number of integrity intervals for a bio
1545 * @bi: blk_integrity profile for device
1546 * @sectors: Size of the bio in 512-byte sectors
1548 * Description: The block layer calculates everything in 512 byte
1549 * sectors but integrity metadata is done in terms of the data integrity
1550 * interval size of the storage device. Convert the block layer sectors
1551 * to the appropriate number of integrity intervals.
1553 static inline unsigned int bio_integrity_intervals(struct blk_integrity
*bi
,
1554 unsigned int sectors
)
1556 return sectors
>> (bi
->interval_exp
- 9);
1559 static inline unsigned int bio_integrity_bytes(struct blk_integrity
*bi
,
1560 unsigned int sectors
)
1562 return bio_integrity_intervals(bi
, sectors
) * bi
->tuple_size
;
1566 * Return the first bvec that contains integrity data. Only drivers that are
1567 * limited to a single integrity segment should use this helper.
1569 static inline struct bio_vec
*rq_integrity_vec(struct request
*rq
)
1571 if (WARN_ON_ONCE(queue_max_integrity_segments(rq
->q
) > 1))
1573 return rq
->bio
->bi_integrity
->bip_vec
;
1576 #else /* CONFIG_BLK_DEV_INTEGRITY */
1579 struct block_device
;
1581 struct blk_integrity
;
1583 static inline int blk_integrity_rq(struct request
*rq
)
1587 static inline int blk_rq_count_integrity_sg(struct request_queue
*q
,
1592 static inline int blk_rq_map_integrity_sg(struct request_queue
*q
,
1594 struct scatterlist
*s
)
1598 static inline struct blk_integrity
*bdev_get_integrity(struct block_device
*b
)
1602 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1606 static inline int blk_integrity_compare(struct gendisk
*a
, struct gendisk
*b
)
1610 static inline void blk_integrity_register(struct gendisk
*d
,
1611 struct blk_integrity
*b
)
1614 static inline void blk_integrity_unregister(struct gendisk
*d
)
1617 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1621 static inline unsigned short queue_max_integrity_segments(struct request_queue
*q
)
1625 static inline bool blk_integrity_merge_rq(struct request_queue
*rq
,
1631 static inline bool blk_integrity_merge_bio(struct request_queue
*rq
,
1638 static inline unsigned int bio_integrity_intervals(struct blk_integrity
*bi
,
1639 unsigned int sectors
)
1644 static inline unsigned int bio_integrity_bytes(struct blk_integrity
*bi
,
1645 unsigned int sectors
)
1650 static inline struct bio_vec
*rq_integrity_vec(struct request
*rq
)
1655 #endif /* CONFIG_BLK_DEV_INTEGRITY */
1657 struct block_device_operations
{
1658 int (*open
) (struct block_device
*, fmode_t
);
1659 void (*release
) (struct gendisk
*, fmode_t
);
1660 int (*rw_page
)(struct block_device
*, sector_t
, struct page
*, unsigned int);
1661 int (*ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1662 int (*compat_ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1663 unsigned int (*check_events
) (struct gendisk
*disk
,
1664 unsigned int clearing
);
1665 /* ->media_changed() is DEPRECATED, use ->check_events() instead */
1666 int (*media_changed
) (struct gendisk
*);
1667 void (*unlock_native_capacity
) (struct gendisk
*);
1668 int (*revalidate_disk
) (struct gendisk
*);
1669 int (*getgeo
)(struct block_device
*, struct hd_geometry
*);
1670 /* this callback is with swap_lock and sometimes page table lock held */
1671 void (*swap_slot_free_notify
) (struct block_device
*, unsigned long);
1672 int (*report_zones
)(struct gendisk
*, sector_t sector
,
1673 struct blk_zone
*zones
, unsigned int *nr_zones
,
1675 struct module
*owner
;
1676 const struct pr_ops
*pr_ops
;
1679 extern int __blkdev_driver_ioctl(struct block_device
*, fmode_t
, unsigned int,
1681 extern int bdev_read_page(struct block_device
*, sector_t
, struct page
*);
1682 extern int bdev_write_page(struct block_device
*, sector_t
, struct page
*,
1683 struct writeback_control
*);
1685 #ifdef CONFIG_BLK_DEV_ZONED
1686 bool blk_req_needs_zone_write_lock(struct request
*rq
);
1687 void __blk_req_zone_write_lock(struct request
*rq
);
1688 void __blk_req_zone_write_unlock(struct request
*rq
);
1690 static inline void blk_req_zone_write_lock(struct request
*rq
)
1692 if (blk_req_needs_zone_write_lock(rq
))
1693 __blk_req_zone_write_lock(rq
);
1696 static inline void blk_req_zone_write_unlock(struct request
*rq
)
1698 if (rq
->rq_flags
& RQF_ZONE_WRITE_LOCKED
)
1699 __blk_req_zone_write_unlock(rq
);
1702 static inline bool blk_req_zone_is_write_locked(struct request
*rq
)
1704 return rq
->q
->seq_zones_wlock
&&
1705 test_bit(blk_rq_zone_no(rq
), rq
->q
->seq_zones_wlock
);
1708 static inline bool blk_req_can_dispatch_to_zone(struct request
*rq
)
1710 if (!blk_req_needs_zone_write_lock(rq
))
1712 return !blk_req_zone_is_write_locked(rq
);
1715 static inline bool blk_req_needs_zone_write_lock(struct request
*rq
)
1720 static inline void blk_req_zone_write_lock(struct request
*rq
)
1724 static inline void blk_req_zone_write_unlock(struct request
*rq
)
1727 static inline bool blk_req_zone_is_write_locked(struct request
*rq
)
1732 static inline bool blk_req_can_dispatch_to_zone(struct request
*rq
)
1736 #endif /* CONFIG_BLK_DEV_ZONED */
1738 #else /* CONFIG_BLOCK */
1740 struct block_device
;
1743 * stubs for when the block layer is configured out
1745 #define buffer_heads_over_limit 0
1747 static inline long nr_blockdev_pages(void)
1755 static inline void blk_start_plug(struct blk_plug
*plug
)
1759 static inline void blk_finish_plug(struct blk_plug
*plug
)
1763 static inline void blk_flush_plug(struct task_struct
*task
)
1767 static inline void blk_schedule_flush_plug(struct task_struct
*task
)
1772 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1777 static inline int blkdev_issue_flush(struct block_device
*bdev
, gfp_t gfp_mask
,
1778 sector_t
*error_sector
)
1783 #endif /* CONFIG_BLOCK */
1785 static inline void blk_wake_io_task(struct task_struct
*waiter
)
1788 * If we're polling, the task itself is doing the completions. For
1789 * that case, we don't need to signal a wakeup, it's enough to just
1790 * mark us as RUNNING.
1792 if (waiter
== current
)
1793 __set_current_state(TASK_RUNNING
);
1795 wake_up_process(waiter
);