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
;
142 /* the following two fields are internal, NEVER access directly */
143 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
;
538 atomic_t mq_freeze_depth
;
540 #if defined(CONFIG_BLK_DEV_BSG)
541 struct bsg_class_device bsg_dev
;
544 #ifdef CONFIG_BLK_DEV_THROTTLING
546 struct throtl_data
*td
;
548 struct rcu_head rcu_head
;
549 wait_queue_head_t mq_freeze_wq
;
550 struct percpu_ref q_usage_counter
;
551 struct list_head all_q_node
;
553 struct blk_mq_tag_set
*tag_set
;
554 struct list_head tag_set_list
;
555 struct bio_set bio_split
;
557 #ifdef CONFIG_BLK_DEBUG_FS
558 struct dentry
*debugfs_dir
;
559 struct dentry
*sched_debugfs_dir
;
560 struct dentry
*rqos_debugfs_dir
;
563 bool mq_sysfs_init_done
;
567 struct work_struct release_work
;
569 #define BLK_MAX_WRITE_HINTS 5
570 u64 write_hints
[BLK_MAX_WRITE_HINTS
];
573 #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */
574 #define QUEUE_FLAG_DYING 1 /* queue being torn down */
575 #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */
576 #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */
577 #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */
578 #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */
579 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
580 #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */
581 #define QUEUE_FLAG_DISCARD 8 /* supports DISCARD */
582 #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */
583 #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */
584 #define QUEUE_FLAG_SECERASE 11 /* supports secure erase */
585 #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */
586 #define QUEUE_FLAG_DEAD 13 /* queue tear-down finished */
587 #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */
588 #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */
589 #define QUEUE_FLAG_WC 17 /* Write back caching */
590 #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */
591 #define QUEUE_FLAG_DAX 19 /* device supports DAX */
592 #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */
593 #define QUEUE_FLAG_POLL_STATS 21 /* collecting stats for hybrid polling */
594 #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */
595 #define QUEUE_FLAG_SCSI_PASSTHROUGH 23 /* queue supports SCSI commands */
596 #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */
597 #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */
599 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
600 (1 << QUEUE_FLAG_SAME_COMP))
602 void blk_queue_flag_set(unsigned int flag
, struct request_queue
*q
);
603 void blk_queue_flag_clear(unsigned int flag
, struct request_queue
*q
);
604 bool blk_queue_flag_test_and_set(unsigned int flag
, struct request_queue
*q
);
606 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
607 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
608 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
609 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
610 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
611 #define blk_queue_noxmerges(q) \
612 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
613 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
614 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
615 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
616 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
617 #define blk_queue_secure_erase(q) \
618 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
619 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
620 #define blk_queue_scsi_passthrough(q) \
621 test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags)
622 #define blk_queue_pci_p2pdma(q) \
623 test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags)
625 #define blk_noretry_request(rq) \
626 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
627 REQ_FAILFAST_DRIVER))
628 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
629 #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only)
630 #define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags)
632 extern void blk_set_pm_only(struct request_queue
*q
);
633 extern void blk_clear_pm_only(struct request_queue
*q
);
635 static inline bool blk_account_rq(struct request
*rq
)
637 return (rq
->rq_flags
& RQF_STARTED
) && !blk_rq_is_passthrough(rq
);
640 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
642 #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ)
644 static inline bool queue_is_mq(struct request_queue
*q
)
649 static inline enum blk_zoned_model
650 blk_queue_zoned_model(struct request_queue
*q
)
652 return q
->limits
.zoned
;
655 static inline bool blk_queue_is_zoned(struct request_queue
*q
)
657 switch (blk_queue_zoned_model(q
)) {
666 static inline unsigned int blk_queue_zone_sectors(struct request_queue
*q
)
668 return blk_queue_is_zoned(q
) ? q
->limits
.chunk_sectors
: 0;
671 #ifdef CONFIG_BLK_DEV_ZONED
672 static inline unsigned int blk_queue_nr_zones(struct request_queue
*q
)
674 return blk_queue_is_zoned(q
) ? q
->nr_zones
: 0;
677 static inline unsigned int blk_queue_zone_no(struct request_queue
*q
,
680 if (!blk_queue_is_zoned(q
))
682 return sector
>> ilog2(q
->limits
.chunk_sectors
);
685 static inline bool blk_queue_zone_is_seq(struct request_queue
*q
,
688 if (!blk_queue_is_zoned(q
) || !q
->seq_zones_bitmap
)
690 return test_bit(blk_queue_zone_no(q
, sector
), q
->seq_zones_bitmap
);
692 #else /* CONFIG_BLK_DEV_ZONED */
693 static inline unsigned int blk_queue_nr_zones(struct request_queue
*q
)
697 #endif /* CONFIG_BLK_DEV_ZONED */
699 static inline bool rq_is_sync(struct request
*rq
)
701 return op_is_sync(rq
->cmd_flags
);
704 static inline bool rq_mergeable(struct request
*rq
)
706 if (blk_rq_is_passthrough(rq
))
709 if (req_op(rq
) == REQ_OP_FLUSH
)
712 if (req_op(rq
) == REQ_OP_WRITE_ZEROES
)
715 if (rq
->cmd_flags
& REQ_NOMERGE_FLAGS
)
717 if (rq
->rq_flags
& RQF_NOMERGE_FLAGS
)
723 static inline bool blk_write_same_mergeable(struct bio
*a
, struct bio
*b
)
725 if (bio_page(a
) == bio_page(b
) &&
726 bio_offset(a
) == bio_offset(b
))
732 static inline unsigned int blk_queue_depth(struct request_queue
*q
)
735 return q
->queue_depth
;
737 return q
->nr_requests
;
740 extern unsigned long blk_max_low_pfn
, blk_max_pfn
;
743 * standard bounce addresses:
745 * BLK_BOUNCE_HIGH : bounce all highmem pages
746 * BLK_BOUNCE_ANY : don't bounce anything
747 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
750 #if BITS_PER_LONG == 32
751 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
753 #define BLK_BOUNCE_HIGH -1ULL
755 #define BLK_BOUNCE_ANY (-1ULL)
756 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
759 * default timeout for SG_IO if none specified
761 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
762 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
768 unsigned long offset
;
773 struct req_iterator
{
774 struct bvec_iter iter
;
778 /* This should not be used directly - use rq_for_each_segment */
779 #define for_each_bio(_bio) \
780 for (; _bio; _bio = _bio->bi_next)
781 #define __rq_for_each_bio(_bio, rq) \
783 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
785 #define rq_for_each_segment(bvl, _rq, _iter) \
786 __rq_for_each_bio(_iter.bio, _rq) \
787 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
789 #define rq_for_each_bvec(bvl, _rq, _iter) \
790 __rq_for_each_bio(_iter.bio, _rq) \
791 bio_for_each_bvec(bvl, _iter.bio, _iter.iter)
793 #define rq_iter_last(bvec, _iter) \
794 (_iter.bio->bi_next == NULL && \
795 bio_iter_last(bvec, _iter.iter))
797 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
798 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
800 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
801 extern void rq_flush_dcache_pages(struct request
*rq
);
803 static inline void rq_flush_dcache_pages(struct request
*rq
)
808 extern int blk_register_queue(struct gendisk
*disk
);
809 extern void blk_unregister_queue(struct gendisk
*disk
);
810 extern blk_qc_t
generic_make_request(struct bio
*bio
);
811 extern blk_qc_t
direct_make_request(struct bio
*bio
);
812 extern void blk_rq_init(struct request_queue
*q
, struct request
*rq
);
813 extern void blk_init_request_from_bio(struct request
*req
, struct bio
*bio
);
814 extern void blk_put_request(struct request
*);
815 extern struct request
*blk_get_request(struct request_queue
*, unsigned int op
,
816 blk_mq_req_flags_t flags
);
817 extern int blk_lld_busy(struct request_queue
*q
);
818 extern int blk_rq_prep_clone(struct request
*rq
, struct request
*rq_src
,
819 struct bio_set
*bs
, gfp_t gfp_mask
,
820 int (*bio_ctr
)(struct bio
*, struct bio
*, void *),
822 extern void blk_rq_unprep_clone(struct request
*rq
);
823 extern blk_status_t
blk_insert_cloned_request(struct request_queue
*q
,
825 extern int blk_rq_append_bio(struct request
*rq
, struct bio
**bio
);
826 extern void blk_queue_split(struct request_queue
*, struct bio
**);
827 extern void blk_recount_segments(struct request_queue
*, struct bio
*);
828 extern int scsi_verify_blk_ioctl(struct block_device
*, unsigned int);
829 extern int scsi_cmd_blk_ioctl(struct block_device
*, fmode_t
,
830 unsigned int, void __user
*);
831 extern int scsi_cmd_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
832 unsigned int, void __user
*);
833 extern int sg_scsi_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
834 struct scsi_ioctl_command __user
*);
836 extern int blk_queue_enter(struct request_queue
*q
, blk_mq_req_flags_t flags
);
837 extern void blk_queue_exit(struct request_queue
*q
);
838 extern void blk_sync_queue(struct request_queue
*q
);
839 extern int blk_rq_map_user(struct request_queue
*, struct request
*,
840 struct rq_map_data
*, void __user
*, unsigned long,
842 extern int blk_rq_unmap_user(struct bio
*);
843 extern int blk_rq_map_kern(struct request_queue
*, struct request
*, void *, unsigned int, gfp_t
);
844 extern int blk_rq_map_user_iov(struct request_queue
*, struct request
*,
845 struct rq_map_data
*, const struct iov_iter
*,
847 extern void blk_execute_rq(struct request_queue
*, struct gendisk
*,
848 struct request
*, int);
849 extern void blk_execute_rq_nowait(struct request_queue
*, struct gendisk
*,
850 struct request
*, int, rq_end_io_fn
*);
852 int blk_status_to_errno(blk_status_t status
);
853 blk_status_t
errno_to_blk_status(int errno
);
855 int blk_poll(struct request_queue
*q
, blk_qc_t cookie
, bool spin
);
857 static inline struct request_queue
*bdev_get_queue(struct block_device
*bdev
)
859 return bdev
->bd_disk
->queue
; /* this is never NULL */
863 * The basic unit of block I/O is a sector. It is used in a number of contexts
864 * in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9
865 * bytes. Variables of type sector_t represent an offset or size that is a
866 * multiple of 512 bytes. Hence these two constants.
869 #define SECTOR_SHIFT 9
872 #define SECTOR_SIZE (1 << SECTOR_SHIFT)
876 * blk_rq_pos() : the current sector
877 * blk_rq_bytes() : bytes left in the entire request
878 * blk_rq_cur_bytes() : bytes left in the current segment
879 * blk_rq_err_bytes() : bytes left till the next error boundary
880 * blk_rq_sectors() : sectors left in the entire request
881 * blk_rq_cur_sectors() : sectors left in the current segment
883 static inline sector_t
blk_rq_pos(const struct request
*rq
)
888 static inline unsigned int blk_rq_bytes(const struct request
*rq
)
890 return rq
->__data_len
;
893 static inline int blk_rq_cur_bytes(const struct request
*rq
)
895 return rq
->bio
? bio_cur_bytes(rq
->bio
) : 0;
898 extern unsigned int blk_rq_err_bytes(const struct request
*rq
);
900 static inline unsigned int blk_rq_sectors(const struct request
*rq
)
902 return blk_rq_bytes(rq
) >> SECTOR_SHIFT
;
905 static inline unsigned int blk_rq_cur_sectors(const struct request
*rq
)
907 return blk_rq_cur_bytes(rq
) >> SECTOR_SHIFT
;
910 #ifdef CONFIG_BLK_DEV_ZONED
911 static inline unsigned int blk_rq_zone_no(struct request
*rq
)
913 return blk_queue_zone_no(rq
->q
, blk_rq_pos(rq
));
916 static inline unsigned int blk_rq_zone_is_seq(struct request
*rq
)
918 return blk_queue_zone_is_seq(rq
->q
, blk_rq_pos(rq
));
920 #endif /* CONFIG_BLK_DEV_ZONED */
923 * Some commands like WRITE SAME have a payload or data transfer size which
924 * is different from the size of the request. Any driver that supports such
925 * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to
926 * calculate the data transfer size.
928 static inline unsigned int blk_rq_payload_bytes(struct request
*rq
)
930 if (rq
->rq_flags
& RQF_SPECIAL_PAYLOAD
)
931 return rq
->special_vec
.bv_len
;
932 return blk_rq_bytes(rq
);
935 static inline unsigned int blk_queue_get_max_sectors(struct request_queue
*q
,
938 if (unlikely(op
== REQ_OP_DISCARD
|| op
== REQ_OP_SECURE_ERASE
))
939 return min(q
->limits
.max_discard_sectors
,
940 UINT_MAX
>> SECTOR_SHIFT
);
942 if (unlikely(op
== REQ_OP_WRITE_SAME
))
943 return q
->limits
.max_write_same_sectors
;
945 if (unlikely(op
== REQ_OP_WRITE_ZEROES
))
946 return q
->limits
.max_write_zeroes_sectors
;
948 return q
->limits
.max_sectors
;
952 * Return maximum size of a request at given offset. Only valid for
953 * file system requests.
955 static inline unsigned int blk_max_size_offset(struct request_queue
*q
,
958 if (!q
->limits
.chunk_sectors
)
959 return q
->limits
.max_sectors
;
961 return min(q
->limits
.max_sectors
, (unsigned int)(q
->limits
.chunk_sectors
-
962 (offset
& (q
->limits
.chunk_sectors
- 1))));
965 static inline unsigned int blk_rq_get_max_sectors(struct request
*rq
,
968 struct request_queue
*q
= rq
->q
;
970 if (blk_rq_is_passthrough(rq
))
971 return q
->limits
.max_hw_sectors
;
973 if (!q
->limits
.chunk_sectors
||
974 req_op(rq
) == REQ_OP_DISCARD
||
975 req_op(rq
) == REQ_OP_SECURE_ERASE
)
976 return blk_queue_get_max_sectors(q
, req_op(rq
));
978 return min(blk_max_size_offset(q
, offset
),
979 blk_queue_get_max_sectors(q
, req_op(rq
)));
982 static inline unsigned int blk_rq_count_bios(struct request
*rq
)
984 unsigned int nr_bios
= 0;
987 __rq_for_each_bio(bio
, rq
)
993 void blk_steal_bios(struct bio_list
*list
, struct request
*rq
);
996 * Request completion related functions.
998 * blk_update_request() completes given number of bytes and updates
999 * the request without completing it.
1001 * blk_end_request() and friends. __blk_end_request() must be called
1002 * with the request queue spinlock acquired.
1004 * Several drivers define their own end_request and call
1005 * blk_end_request() for parts of the original function.
1006 * This prevents code duplication in drivers.
1008 extern bool blk_update_request(struct request
*rq
, blk_status_t error
,
1009 unsigned int nr_bytes
);
1010 extern void blk_end_request_all(struct request
*rq
, blk_status_t error
);
1011 extern bool __blk_end_request(struct request
*rq
, blk_status_t error
,
1012 unsigned int nr_bytes
);
1013 extern void __blk_end_request_all(struct request
*rq
, blk_status_t error
);
1014 extern bool __blk_end_request_cur(struct request
*rq
, blk_status_t error
);
1016 extern void __blk_complete_request(struct request
*);
1017 extern void blk_abort_request(struct request
*);
1020 * Access functions for manipulating queue properties
1022 extern void blk_cleanup_queue(struct request_queue
*);
1023 extern void blk_queue_make_request(struct request_queue
*, make_request_fn
*);
1024 extern void blk_queue_bounce_limit(struct request_queue
*, u64
);
1025 extern void blk_queue_max_hw_sectors(struct request_queue
*, unsigned int);
1026 extern void blk_queue_chunk_sectors(struct request_queue
*, unsigned int);
1027 extern void blk_queue_max_segments(struct request_queue
*, unsigned short);
1028 extern void blk_queue_max_discard_segments(struct request_queue
*,
1030 extern void blk_queue_max_segment_size(struct request_queue
*, unsigned int);
1031 extern void blk_queue_max_discard_sectors(struct request_queue
*q
,
1032 unsigned int max_discard_sectors
);
1033 extern void blk_queue_max_write_same_sectors(struct request_queue
*q
,
1034 unsigned int max_write_same_sectors
);
1035 extern void blk_queue_max_write_zeroes_sectors(struct request_queue
*q
,
1036 unsigned int max_write_same_sectors
);
1037 extern void blk_queue_logical_block_size(struct request_queue
*, unsigned short);
1038 extern void blk_queue_physical_block_size(struct request_queue
*, unsigned int);
1039 extern void blk_queue_alignment_offset(struct request_queue
*q
,
1040 unsigned int alignment
);
1041 extern void blk_limits_io_min(struct queue_limits
*limits
, unsigned int min
);
1042 extern void blk_queue_io_min(struct request_queue
*q
, unsigned int min
);
1043 extern void blk_limits_io_opt(struct queue_limits
*limits
, unsigned int opt
);
1044 extern void blk_queue_io_opt(struct request_queue
*q
, unsigned int opt
);
1045 extern void blk_set_queue_depth(struct request_queue
*q
, unsigned int depth
);
1046 extern void blk_set_default_limits(struct queue_limits
*lim
);
1047 extern void blk_set_stacking_limits(struct queue_limits
*lim
);
1048 extern int blk_stack_limits(struct queue_limits
*t
, struct queue_limits
*b
,
1050 extern int bdev_stack_limits(struct queue_limits
*t
, struct block_device
*bdev
,
1052 extern void disk_stack_limits(struct gendisk
*disk
, struct block_device
*bdev
,
1054 extern void blk_queue_stack_limits(struct request_queue
*t
, struct request_queue
*b
);
1055 extern void blk_queue_dma_pad(struct request_queue
*, unsigned int);
1056 extern void blk_queue_update_dma_pad(struct request_queue
*, unsigned int);
1057 extern int blk_queue_dma_drain(struct request_queue
*q
,
1058 dma_drain_needed_fn
*dma_drain_needed
,
1059 void *buf
, unsigned int size
);
1060 extern void blk_queue_segment_boundary(struct request_queue
*, unsigned long);
1061 extern void blk_queue_virt_boundary(struct request_queue
*, unsigned long);
1062 extern void blk_queue_dma_alignment(struct request_queue
*, int);
1063 extern void blk_queue_update_dma_alignment(struct request_queue
*, int);
1064 extern void blk_queue_rq_timeout(struct request_queue
*, unsigned int);
1065 extern void blk_queue_write_cache(struct request_queue
*q
, bool enabled
, bool fua
);
1068 * Number of physical segments as sent to the device.
1070 * Normally this is the number of discontiguous data segments sent by the
1071 * submitter. But for data-less command like discard we might have no
1072 * actual data segments submitted, but the driver might have to add it's
1073 * own special payload. In that case we still return 1 here so that this
1074 * special payload will be mapped.
1076 static inline unsigned short blk_rq_nr_phys_segments(struct request
*rq
)
1078 if (rq
->rq_flags
& RQF_SPECIAL_PAYLOAD
)
1080 return rq
->nr_phys_segments
;
1084 * Number of discard segments (or ranges) the driver needs to fill in.
1085 * Each discard bio merged into a request is counted as one segment.
1087 static inline unsigned short blk_rq_nr_discard_segments(struct request
*rq
)
1089 return max_t(unsigned short, rq
->nr_phys_segments
, 1);
1092 extern int blk_rq_map_sg(struct request_queue
*, struct request
*, struct scatterlist
*);
1093 extern void blk_dump_rq_flags(struct request
*, char *);
1094 extern long nr_blockdev_pages(void);
1096 bool __must_check
blk_get_queue(struct request_queue
*);
1097 struct request_queue
*blk_alloc_queue(gfp_t
);
1098 struct request_queue
*blk_alloc_queue_node(gfp_t gfp_mask
, int node_id
);
1099 extern void blk_put_queue(struct request_queue
*);
1100 extern void blk_set_queue_dying(struct request_queue
*);
1103 * blk_plug permits building a queue of related requests by holding the I/O
1104 * fragments for a short period. This allows merging of sequential requests
1105 * into single larger request. As the requests are moved from a per-task list to
1106 * the device's request_queue in a batch, this results in improved scalability
1107 * as the lock contention for request_queue lock is reduced.
1109 * It is ok not to disable preemption when adding the request to the plug list
1110 * or when attempting a merge, because blk_schedule_flush_list() will only flush
1111 * the plug list when the task sleeps by itself. For details, please see
1112 * schedule() where blk_schedule_flush_plug() is called.
1115 struct list_head mq_list
; /* blk-mq requests */
1116 struct list_head cb_list
; /* md requires an unplug callback */
1117 unsigned short rq_count
;
1118 bool multiple_queues
;
1120 #define BLK_MAX_REQUEST_COUNT 16
1121 #define BLK_PLUG_FLUSH_SIZE (128 * 1024)
1124 typedef void (*blk_plug_cb_fn
)(struct blk_plug_cb
*, bool);
1125 struct blk_plug_cb
{
1126 struct list_head list
;
1127 blk_plug_cb_fn callback
;
1130 extern struct blk_plug_cb
*blk_check_plugged(blk_plug_cb_fn unplug
,
1131 void *data
, int size
);
1132 extern void blk_start_plug(struct blk_plug
*);
1133 extern void blk_finish_plug(struct blk_plug
*);
1134 extern void blk_flush_plug_list(struct blk_plug
*, bool);
1136 static inline void blk_flush_plug(struct task_struct
*tsk
)
1138 struct blk_plug
*plug
= tsk
->plug
;
1141 blk_flush_plug_list(plug
, false);
1144 static inline void blk_schedule_flush_plug(struct task_struct
*tsk
)
1146 struct blk_plug
*plug
= tsk
->plug
;
1149 blk_flush_plug_list(plug
, true);
1152 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1154 struct blk_plug
*plug
= tsk
->plug
;
1157 (!list_empty(&plug
->mq_list
) ||
1158 !list_empty(&plug
->cb_list
));
1161 extern int blkdev_issue_flush(struct block_device
*, gfp_t
, sector_t
*);
1162 extern int blkdev_issue_write_same(struct block_device
*bdev
, sector_t sector
,
1163 sector_t nr_sects
, gfp_t gfp_mask
, struct page
*page
);
1165 #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */
1167 extern int blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1168 sector_t nr_sects
, gfp_t gfp_mask
, unsigned long flags
);
1169 extern int __blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1170 sector_t nr_sects
, gfp_t gfp_mask
, int flags
,
1173 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
1174 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
1176 extern int __blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1177 sector_t nr_sects
, gfp_t gfp_mask
, struct bio
**biop
,
1179 extern int blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1180 sector_t nr_sects
, gfp_t gfp_mask
, unsigned flags
);
1182 static inline int sb_issue_discard(struct super_block
*sb
, sector_t block
,
1183 sector_t nr_blocks
, gfp_t gfp_mask
, unsigned long flags
)
1185 return blkdev_issue_discard(sb
->s_bdev
,
1186 block
<< (sb
->s_blocksize_bits
-
1188 nr_blocks
<< (sb
->s_blocksize_bits
-
1192 static inline int sb_issue_zeroout(struct super_block
*sb
, sector_t block
,
1193 sector_t nr_blocks
, gfp_t gfp_mask
)
1195 return blkdev_issue_zeroout(sb
->s_bdev
,
1196 block
<< (sb
->s_blocksize_bits
-
1198 nr_blocks
<< (sb
->s_blocksize_bits
-
1203 extern int blk_verify_command(unsigned char *cmd
, fmode_t mode
);
1205 enum blk_default_limits
{
1206 BLK_MAX_SEGMENTS
= 128,
1207 BLK_SAFE_MAX_SECTORS
= 255,
1208 BLK_DEF_MAX_SECTORS
= 2560,
1209 BLK_MAX_SEGMENT_SIZE
= 65536,
1210 BLK_SEG_BOUNDARY_MASK
= 0xFFFFFFFFUL
,
1213 static inline unsigned long queue_segment_boundary(struct request_queue
*q
)
1215 return q
->limits
.seg_boundary_mask
;
1218 static inline unsigned long queue_virt_boundary(struct request_queue
*q
)
1220 return q
->limits
.virt_boundary_mask
;
1223 static inline unsigned int queue_max_sectors(struct request_queue
*q
)
1225 return q
->limits
.max_sectors
;
1228 static inline unsigned int queue_max_hw_sectors(struct request_queue
*q
)
1230 return q
->limits
.max_hw_sectors
;
1233 static inline unsigned short queue_max_segments(struct request_queue
*q
)
1235 return q
->limits
.max_segments
;
1238 static inline unsigned short queue_max_discard_segments(struct request_queue
*q
)
1240 return q
->limits
.max_discard_segments
;
1243 static inline unsigned int queue_max_segment_size(struct request_queue
*q
)
1245 return q
->limits
.max_segment_size
;
1248 static inline unsigned short queue_logical_block_size(struct request_queue
*q
)
1252 if (q
&& q
->limits
.logical_block_size
)
1253 retval
= q
->limits
.logical_block_size
;
1258 static inline unsigned short bdev_logical_block_size(struct block_device
*bdev
)
1260 return queue_logical_block_size(bdev_get_queue(bdev
));
1263 static inline unsigned int queue_physical_block_size(struct request_queue
*q
)
1265 return q
->limits
.physical_block_size
;
1268 static inline unsigned int bdev_physical_block_size(struct block_device
*bdev
)
1270 return queue_physical_block_size(bdev_get_queue(bdev
));
1273 static inline unsigned int queue_io_min(struct request_queue
*q
)
1275 return q
->limits
.io_min
;
1278 static inline int bdev_io_min(struct block_device
*bdev
)
1280 return queue_io_min(bdev_get_queue(bdev
));
1283 static inline unsigned int queue_io_opt(struct request_queue
*q
)
1285 return q
->limits
.io_opt
;
1288 static inline int bdev_io_opt(struct block_device
*bdev
)
1290 return queue_io_opt(bdev_get_queue(bdev
));
1293 static inline int queue_alignment_offset(struct request_queue
*q
)
1295 if (q
->limits
.misaligned
)
1298 return q
->limits
.alignment_offset
;
1301 static inline int queue_limit_alignment_offset(struct queue_limits
*lim
, sector_t sector
)
1303 unsigned int granularity
= max(lim
->physical_block_size
, lim
->io_min
);
1304 unsigned int alignment
= sector_div(sector
, granularity
>> SECTOR_SHIFT
)
1307 return (granularity
+ lim
->alignment_offset
- alignment
) % granularity
;
1310 static inline int bdev_alignment_offset(struct block_device
*bdev
)
1312 struct request_queue
*q
= bdev_get_queue(bdev
);
1314 if (q
->limits
.misaligned
)
1317 if (bdev
!= bdev
->bd_contains
)
1318 return bdev
->bd_part
->alignment_offset
;
1320 return q
->limits
.alignment_offset
;
1323 static inline int queue_discard_alignment(struct request_queue
*q
)
1325 if (q
->limits
.discard_misaligned
)
1328 return q
->limits
.discard_alignment
;
1331 static inline int queue_limit_discard_alignment(struct queue_limits
*lim
, sector_t sector
)
1333 unsigned int alignment
, granularity
, offset
;
1335 if (!lim
->max_discard_sectors
)
1338 /* Why are these in bytes, not sectors? */
1339 alignment
= lim
->discard_alignment
>> SECTOR_SHIFT
;
1340 granularity
= lim
->discard_granularity
>> SECTOR_SHIFT
;
1344 /* Offset of the partition start in 'granularity' sectors */
1345 offset
= sector_div(sector
, granularity
);
1347 /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1348 offset
= (granularity
+ alignment
- offset
) % granularity
;
1350 /* Turn it back into bytes, gaah */
1351 return offset
<< SECTOR_SHIFT
;
1354 static inline int bdev_discard_alignment(struct block_device
*bdev
)
1356 struct request_queue
*q
= bdev_get_queue(bdev
);
1358 if (bdev
!= bdev
->bd_contains
)
1359 return bdev
->bd_part
->discard_alignment
;
1361 return q
->limits
.discard_alignment
;
1364 static inline unsigned int bdev_write_same(struct block_device
*bdev
)
1366 struct request_queue
*q
= bdev_get_queue(bdev
);
1369 return q
->limits
.max_write_same_sectors
;
1374 static inline unsigned int bdev_write_zeroes_sectors(struct block_device
*bdev
)
1376 struct request_queue
*q
= bdev_get_queue(bdev
);
1379 return q
->limits
.max_write_zeroes_sectors
;
1384 static inline enum blk_zoned_model
bdev_zoned_model(struct block_device
*bdev
)
1386 struct request_queue
*q
= bdev_get_queue(bdev
);
1389 return blk_queue_zoned_model(q
);
1391 return BLK_ZONED_NONE
;
1394 static inline bool bdev_is_zoned(struct block_device
*bdev
)
1396 struct request_queue
*q
= bdev_get_queue(bdev
);
1399 return blk_queue_is_zoned(q
);
1404 static inline unsigned int bdev_zone_sectors(struct block_device
*bdev
)
1406 struct request_queue
*q
= bdev_get_queue(bdev
);
1409 return blk_queue_zone_sectors(q
);
1413 static inline int queue_dma_alignment(struct request_queue
*q
)
1415 return q
? q
->dma_alignment
: 511;
1418 static inline int blk_rq_aligned(struct request_queue
*q
, unsigned long addr
,
1421 unsigned int alignment
= queue_dma_alignment(q
) | q
->dma_pad_mask
;
1422 return !(addr
& alignment
) && !(len
& alignment
);
1425 /* assumes size > 256 */
1426 static inline unsigned int blksize_bits(unsigned int size
)
1428 unsigned int bits
= 8;
1432 } while (size
> 256);
1436 static inline unsigned int block_size(struct block_device
*bdev
)
1438 return bdev
->bd_block_size
;
1441 typedef struct {struct page
*v
;} Sector
;
1443 unsigned char *read_dev_sector(struct block_device
*, sector_t
, Sector
*);
1445 static inline void put_dev_sector(Sector p
)
1450 int kblockd_schedule_work(struct work_struct
*work
);
1451 int kblockd_schedule_work_on(int cpu
, struct work_struct
*work
);
1452 int kblockd_mod_delayed_work_on(int cpu
, struct delayed_work
*dwork
, unsigned long delay
);
1454 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1455 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1456 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1457 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1459 #if defined(CONFIG_BLK_DEV_INTEGRITY)
1461 enum blk_integrity_flags
{
1462 BLK_INTEGRITY_VERIFY
= 1 << 0,
1463 BLK_INTEGRITY_GENERATE
= 1 << 1,
1464 BLK_INTEGRITY_DEVICE_CAPABLE
= 1 << 2,
1465 BLK_INTEGRITY_IP_CHECKSUM
= 1 << 3,
1468 struct blk_integrity_iter
{
1472 unsigned int data_size
;
1473 unsigned short interval
;
1474 const char *disk_name
;
1477 typedef blk_status_t (integrity_processing_fn
) (struct blk_integrity_iter
*);
1479 struct blk_integrity_profile
{
1480 integrity_processing_fn
*generate_fn
;
1481 integrity_processing_fn
*verify_fn
;
1485 extern void blk_integrity_register(struct gendisk
*, struct blk_integrity
*);
1486 extern void blk_integrity_unregister(struct gendisk
*);
1487 extern int blk_integrity_compare(struct gendisk
*, struct gendisk
*);
1488 extern int blk_rq_map_integrity_sg(struct request_queue
*, struct bio
*,
1489 struct scatterlist
*);
1490 extern int blk_rq_count_integrity_sg(struct request_queue
*, struct bio
*);
1491 extern bool blk_integrity_merge_rq(struct request_queue
*, struct request
*,
1493 extern bool blk_integrity_merge_bio(struct request_queue
*, struct request
*,
1496 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1498 struct blk_integrity
*bi
= &disk
->queue
->integrity
;
1507 struct blk_integrity
*bdev_get_integrity(struct block_device
*bdev
)
1509 return blk_get_integrity(bdev
->bd_disk
);
1512 static inline bool blk_integrity_rq(struct request
*rq
)
1514 return rq
->cmd_flags
& REQ_INTEGRITY
;
1517 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1520 q
->limits
.max_integrity_segments
= segs
;
1523 static inline unsigned short
1524 queue_max_integrity_segments(struct request_queue
*q
)
1526 return q
->limits
.max_integrity_segments
;
1530 * bio_integrity_intervals - Return number of integrity intervals for a bio
1531 * @bi: blk_integrity profile for device
1532 * @sectors: Size of the bio in 512-byte sectors
1534 * Description: The block layer calculates everything in 512 byte
1535 * sectors but integrity metadata is done in terms of the data integrity
1536 * interval size of the storage device. Convert the block layer sectors
1537 * to the appropriate number of integrity intervals.
1539 static inline unsigned int bio_integrity_intervals(struct blk_integrity
*bi
,
1540 unsigned int sectors
)
1542 return sectors
>> (bi
->interval_exp
- 9);
1545 static inline unsigned int bio_integrity_bytes(struct blk_integrity
*bi
,
1546 unsigned int sectors
)
1548 return bio_integrity_intervals(bi
, sectors
) * bi
->tuple_size
;
1551 #else /* CONFIG_BLK_DEV_INTEGRITY */
1554 struct block_device
;
1556 struct blk_integrity
;
1558 static inline int blk_integrity_rq(struct request
*rq
)
1562 static inline int blk_rq_count_integrity_sg(struct request_queue
*q
,
1567 static inline int blk_rq_map_integrity_sg(struct request_queue
*q
,
1569 struct scatterlist
*s
)
1573 static inline struct blk_integrity
*bdev_get_integrity(struct block_device
*b
)
1577 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1581 static inline int blk_integrity_compare(struct gendisk
*a
, struct gendisk
*b
)
1585 static inline void blk_integrity_register(struct gendisk
*d
,
1586 struct blk_integrity
*b
)
1589 static inline void blk_integrity_unregister(struct gendisk
*d
)
1592 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1596 static inline unsigned short queue_max_integrity_segments(struct request_queue
*q
)
1600 static inline bool blk_integrity_merge_rq(struct request_queue
*rq
,
1606 static inline bool blk_integrity_merge_bio(struct request_queue
*rq
,
1613 static inline unsigned int bio_integrity_intervals(struct blk_integrity
*bi
,
1614 unsigned int sectors
)
1619 static inline unsigned int bio_integrity_bytes(struct blk_integrity
*bi
,
1620 unsigned int sectors
)
1625 #endif /* CONFIG_BLK_DEV_INTEGRITY */
1627 struct block_device_operations
{
1628 int (*open
) (struct block_device
*, fmode_t
);
1629 void (*release
) (struct gendisk
*, fmode_t
);
1630 int (*rw_page
)(struct block_device
*, sector_t
, struct page
*, unsigned int);
1631 int (*ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1632 int (*compat_ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1633 unsigned int (*check_events
) (struct gendisk
*disk
,
1634 unsigned int clearing
);
1635 /* ->media_changed() is DEPRECATED, use ->check_events() instead */
1636 int (*media_changed
) (struct gendisk
*);
1637 void (*unlock_native_capacity
) (struct gendisk
*);
1638 int (*revalidate_disk
) (struct gendisk
*);
1639 int (*getgeo
)(struct block_device
*, struct hd_geometry
*);
1640 /* this callback is with swap_lock and sometimes page table lock held */
1641 void (*swap_slot_free_notify
) (struct block_device
*, unsigned long);
1642 int (*report_zones
)(struct gendisk
*, sector_t sector
,
1643 struct blk_zone
*zones
, unsigned int *nr_zones
,
1645 struct module
*owner
;
1646 const struct pr_ops
*pr_ops
;
1649 extern int __blkdev_driver_ioctl(struct block_device
*, fmode_t
, unsigned int,
1651 extern int bdev_read_page(struct block_device
*, sector_t
, struct page
*);
1652 extern int bdev_write_page(struct block_device
*, sector_t
, struct page
*,
1653 struct writeback_control
*);
1655 #ifdef CONFIG_BLK_DEV_ZONED
1656 bool blk_req_needs_zone_write_lock(struct request
*rq
);
1657 void __blk_req_zone_write_lock(struct request
*rq
);
1658 void __blk_req_zone_write_unlock(struct request
*rq
);
1660 static inline void blk_req_zone_write_lock(struct request
*rq
)
1662 if (blk_req_needs_zone_write_lock(rq
))
1663 __blk_req_zone_write_lock(rq
);
1666 static inline void blk_req_zone_write_unlock(struct request
*rq
)
1668 if (rq
->rq_flags
& RQF_ZONE_WRITE_LOCKED
)
1669 __blk_req_zone_write_unlock(rq
);
1672 static inline bool blk_req_zone_is_write_locked(struct request
*rq
)
1674 return rq
->q
->seq_zones_wlock
&&
1675 test_bit(blk_rq_zone_no(rq
), rq
->q
->seq_zones_wlock
);
1678 static inline bool blk_req_can_dispatch_to_zone(struct request
*rq
)
1680 if (!blk_req_needs_zone_write_lock(rq
))
1682 return !blk_req_zone_is_write_locked(rq
);
1685 static inline bool blk_req_needs_zone_write_lock(struct request
*rq
)
1690 static inline void blk_req_zone_write_lock(struct request
*rq
)
1694 static inline void blk_req_zone_write_unlock(struct request
*rq
)
1697 static inline bool blk_req_zone_is_write_locked(struct request
*rq
)
1702 static inline bool blk_req_can_dispatch_to_zone(struct request
*rq
)
1706 #endif /* CONFIG_BLK_DEV_ZONED */
1708 #else /* CONFIG_BLOCK */
1710 struct block_device
;
1713 * stubs for when the block layer is configured out
1715 #define buffer_heads_over_limit 0
1717 static inline long nr_blockdev_pages(void)
1725 static inline void blk_start_plug(struct blk_plug
*plug
)
1729 static inline void blk_finish_plug(struct blk_plug
*plug
)
1733 static inline void blk_flush_plug(struct task_struct
*task
)
1737 static inline void blk_schedule_flush_plug(struct task_struct
*task
)
1742 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1747 static inline int blkdev_issue_flush(struct block_device
*bdev
, gfp_t gfp_mask
,
1748 sector_t
*error_sector
)
1753 #endif /* CONFIG_BLOCK */
1755 static inline void blk_wake_io_task(struct task_struct
*waiter
)
1758 * If we're polling, the task itself is doing the completions. For
1759 * that case, we don't need to signal a wakeup, it's enough to just
1760 * mark us as RUNNING.
1762 if (waiter
== current
)
1763 __set_current_state(TASK_RUNNING
);
1765 wake_up_process(waiter
);