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
;
552 struct blk_mq_tag_set
*tag_set
;
553 struct list_head tag_set_list
;
554 struct bio_set bio_split
;
556 #ifdef CONFIG_BLK_DEBUG_FS
557 struct dentry
*debugfs_dir
;
558 struct dentry
*sched_debugfs_dir
;
559 struct dentry
*rqos_debugfs_dir
;
562 bool mq_sysfs_init_done
;
566 struct work_struct release_work
;
568 #define BLK_MAX_WRITE_HINTS 5
569 u64 write_hints
[BLK_MAX_WRITE_HINTS
];
572 #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */
573 #define QUEUE_FLAG_DYING 1 /* queue being torn down */
574 #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */
575 #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */
576 #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */
577 #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */
578 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
579 #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */
580 #define QUEUE_FLAG_DISCARD 8 /* supports DISCARD */
581 #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */
582 #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */
583 #define QUEUE_FLAG_SECERASE 11 /* supports secure erase */
584 #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */
585 #define QUEUE_FLAG_DEAD 13 /* queue tear-down finished */
586 #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */
587 #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */
588 #define QUEUE_FLAG_WC 17 /* Write back caching */
589 #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */
590 #define QUEUE_FLAG_DAX 19 /* device supports DAX */
591 #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */
592 #define QUEUE_FLAG_POLL_STATS 21 /* collecting stats for hybrid polling */
593 #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */
594 #define QUEUE_FLAG_SCSI_PASSTHROUGH 23 /* queue supports SCSI commands */
595 #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */
596 #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */
598 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
599 (1 << QUEUE_FLAG_SAME_COMP))
601 void blk_queue_flag_set(unsigned int flag
, struct request_queue
*q
);
602 void blk_queue_flag_clear(unsigned int flag
, struct request_queue
*q
);
603 bool blk_queue_flag_test_and_set(unsigned int flag
, struct request_queue
*q
);
605 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
606 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
607 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
608 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
609 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
610 #define blk_queue_noxmerges(q) \
611 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
612 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
613 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
614 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
615 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
616 #define blk_queue_secure_erase(q) \
617 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
618 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
619 #define blk_queue_scsi_passthrough(q) \
620 test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags)
621 #define blk_queue_pci_p2pdma(q) \
622 test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags)
624 #define blk_noretry_request(rq) \
625 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
626 REQ_FAILFAST_DRIVER))
627 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
628 #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only)
629 #define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags)
631 extern void blk_set_pm_only(struct request_queue
*q
);
632 extern void blk_clear_pm_only(struct request_queue
*q
);
634 static inline bool blk_account_rq(struct request
*rq
)
636 return (rq
->rq_flags
& RQF_STARTED
) && !blk_rq_is_passthrough(rq
);
639 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
641 #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ)
643 static inline bool queue_is_mq(struct request_queue
*q
)
648 static inline enum blk_zoned_model
649 blk_queue_zoned_model(struct request_queue
*q
)
651 return q
->limits
.zoned
;
654 static inline bool blk_queue_is_zoned(struct request_queue
*q
)
656 switch (blk_queue_zoned_model(q
)) {
665 static inline unsigned int blk_queue_zone_sectors(struct request_queue
*q
)
667 return blk_queue_is_zoned(q
) ? q
->limits
.chunk_sectors
: 0;
670 #ifdef CONFIG_BLK_DEV_ZONED
671 static inline unsigned int blk_queue_nr_zones(struct request_queue
*q
)
673 return blk_queue_is_zoned(q
) ? q
->nr_zones
: 0;
676 static inline unsigned int blk_queue_zone_no(struct request_queue
*q
,
679 if (!blk_queue_is_zoned(q
))
681 return sector
>> ilog2(q
->limits
.chunk_sectors
);
684 static inline bool blk_queue_zone_is_seq(struct request_queue
*q
,
687 if (!blk_queue_is_zoned(q
) || !q
->seq_zones_bitmap
)
689 return test_bit(blk_queue_zone_no(q
, sector
), q
->seq_zones_bitmap
);
691 #else /* CONFIG_BLK_DEV_ZONED */
692 static inline unsigned int blk_queue_nr_zones(struct request_queue
*q
)
696 #endif /* CONFIG_BLK_DEV_ZONED */
698 static inline bool rq_is_sync(struct request
*rq
)
700 return op_is_sync(rq
->cmd_flags
);
703 static inline bool rq_mergeable(struct request
*rq
)
705 if (blk_rq_is_passthrough(rq
))
708 if (req_op(rq
) == REQ_OP_FLUSH
)
711 if (req_op(rq
) == REQ_OP_WRITE_ZEROES
)
714 if (rq
->cmd_flags
& REQ_NOMERGE_FLAGS
)
716 if (rq
->rq_flags
& RQF_NOMERGE_FLAGS
)
722 static inline bool blk_write_same_mergeable(struct bio
*a
, struct bio
*b
)
724 if (bio_page(a
) == bio_page(b
) &&
725 bio_offset(a
) == bio_offset(b
))
731 static inline unsigned int blk_queue_depth(struct request_queue
*q
)
734 return q
->queue_depth
;
736 return q
->nr_requests
;
739 extern unsigned long blk_max_low_pfn
, blk_max_pfn
;
742 * standard bounce addresses:
744 * BLK_BOUNCE_HIGH : bounce all highmem pages
745 * BLK_BOUNCE_ANY : don't bounce anything
746 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
749 #if BITS_PER_LONG == 32
750 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
752 #define BLK_BOUNCE_HIGH -1ULL
754 #define BLK_BOUNCE_ANY (-1ULL)
755 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
758 * default timeout for SG_IO if none specified
760 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
761 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
767 unsigned long offset
;
772 struct req_iterator
{
773 struct bvec_iter iter
;
777 /* This should not be used directly - use rq_for_each_segment */
778 #define for_each_bio(_bio) \
779 for (; _bio; _bio = _bio->bi_next)
780 #define __rq_for_each_bio(_bio, rq) \
782 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
784 #define rq_for_each_segment(bvl, _rq, _iter) \
785 __rq_for_each_bio(_iter.bio, _rq) \
786 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
788 #define rq_for_each_bvec(bvl, _rq, _iter) \
789 __rq_for_each_bio(_iter.bio, _rq) \
790 bio_for_each_bvec(bvl, _iter.bio, _iter.iter)
792 #define rq_iter_last(bvec, _iter) \
793 (_iter.bio->bi_next == NULL && \
794 bio_iter_last(bvec, _iter.iter))
796 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
797 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
799 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
800 extern void rq_flush_dcache_pages(struct request
*rq
);
802 static inline void rq_flush_dcache_pages(struct request
*rq
)
807 extern int blk_register_queue(struct gendisk
*disk
);
808 extern void blk_unregister_queue(struct gendisk
*disk
);
809 extern blk_qc_t
generic_make_request(struct bio
*bio
);
810 extern blk_qc_t
direct_make_request(struct bio
*bio
);
811 extern void blk_rq_init(struct request_queue
*q
, struct request
*rq
);
812 extern void blk_init_request_from_bio(struct request
*req
, struct bio
*bio
);
813 extern void blk_put_request(struct request
*);
814 extern struct request
*blk_get_request(struct request_queue
*, unsigned int op
,
815 blk_mq_req_flags_t flags
);
816 extern int blk_lld_busy(struct request_queue
*q
);
817 extern int blk_rq_prep_clone(struct request
*rq
, struct request
*rq_src
,
818 struct bio_set
*bs
, gfp_t gfp_mask
,
819 int (*bio_ctr
)(struct bio
*, struct bio
*, void *),
821 extern void blk_rq_unprep_clone(struct request
*rq
);
822 extern blk_status_t
blk_insert_cloned_request(struct request_queue
*q
,
824 extern int blk_rq_append_bio(struct request
*rq
, struct bio
**bio
);
825 extern void blk_queue_split(struct request_queue
*, struct bio
**);
826 extern void blk_recount_segments(struct request_queue
*, struct bio
*);
827 extern int scsi_verify_blk_ioctl(struct block_device
*, unsigned int);
828 extern int scsi_cmd_blk_ioctl(struct block_device
*, fmode_t
,
829 unsigned int, void __user
*);
830 extern int scsi_cmd_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
831 unsigned int, void __user
*);
832 extern int sg_scsi_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
833 struct scsi_ioctl_command __user
*);
835 extern int blk_queue_enter(struct request_queue
*q
, blk_mq_req_flags_t flags
);
836 extern void blk_queue_exit(struct request_queue
*q
);
837 extern void blk_sync_queue(struct request_queue
*q
);
838 extern int blk_rq_map_user(struct request_queue
*, struct request
*,
839 struct rq_map_data
*, void __user
*, unsigned long,
841 extern int blk_rq_unmap_user(struct bio
*);
842 extern int blk_rq_map_kern(struct request_queue
*, struct request
*, void *, unsigned int, gfp_t
);
843 extern int blk_rq_map_user_iov(struct request_queue
*, struct request
*,
844 struct rq_map_data
*, const struct iov_iter
*,
846 extern void blk_execute_rq(struct request_queue
*, struct gendisk
*,
847 struct request
*, int);
848 extern void blk_execute_rq_nowait(struct request_queue
*, struct gendisk
*,
849 struct request
*, int, rq_end_io_fn
*);
851 int blk_status_to_errno(blk_status_t status
);
852 blk_status_t
errno_to_blk_status(int errno
);
854 int blk_poll(struct request_queue
*q
, blk_qc_t cookie
, bool spin
);
856 static inline struct request_queue
*bdev_get_queue(struct block_device
*bdev
)
858 return bdev
->bd_disk
->queue
; /* this is never NULL */
862 * The basic unit of block I/O is a sector. It is used in a number of contexts
863 * in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9
864 * bytes. Variables of type sector_t represent an offset or size that is a
865 * multiple of 512 bytes. Hence these two constants.
868 #define SECTOR_SHIFT 9
871 #define SECTOR_SIZE (1 << SECTOR_SHIFT)
875 * blk_rq_pos() : the current sector
876 * blk_rq_bytes() : bytes left in the entire request
877 * blk_rq_cur_bytes() : bytes left in the current segment
878 * blk_rq_err_bytes() : bytes left till the next error boundary
879 * blk_rq_sectors() : sectors left in the entire request
880 * blk_rq_cur_sectors() : sectors left in the current segment
882 static inline sector_t
blk_rq_pos(const struct request
*rq
)
887 static inline unsigned int blk_rq_bytes(const struct request
*rq
)
889 return rq
->__data_len
;
892 static inline int blk_rq_cur_bytes(const struct request
*rq
)
894 return rq
->bio
? bio_cur_bytes(rq
->bio
) : 0;
897 extern unsigned int blk_rq_err_bytes(const struct request
*rq
);
899 static inline unsigned int blk_rq_sectors(const struct request
*rq
)
901 return blk_rq_bytes(rq
) >> SECTOR_SHIFT
;
904 static inline unsigned int blk_rq_cur_sectors(const struct request
*rq
)
906 return blk_rq_cur_bytes(rq
) >> SECTOR_SHIFT
;
909 #ifdef CONFIG_BLK_DEV_ZONED
910 static inline unsigned int blk_rq_zone_no(struct request
*rq
)
912 return blk_queue_zone_no(rq
->q
, blk_rq_pos(rq
));
915 static inline unsigned int blk_rq_zone_is_seq(struct request
*rq
)
917 return blk_queue_zone_is_seq(rq
->q
, blk_rq_pos(rq
));
919 #endif /* CONFIG_BLK_DEV_ZONED */
922 * Some commands like WRITE SAME have a payload or data transfer size which
923 * is different from the size of the request. Any driver that supports such
924 * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to
925 * calculate the data transfer size.
927 static inline unsigned int blk_rq_payload_bytes(struct request
*rq
)
929 if (rq
->rq_flags
& RQF_SPECIAL_PAYLOAD
)
930 return rq
->special_vec
.bv_len
;
931 return blk_rq_bytes(rq
);
934 static inline unsigned int blk_queue_get_max_sectors(struct request_queue
*q
,
937 if (unlikely(op
== REQ_OP_DISCARD
|| op
== REQ_OP_SECURE_ERASE
))
938 return min(q
->limits
.max_discard_sectors
,
939 UINT_MAX
>> SECTOR_SHIFT
);
941 if (unlikely(op
== REQ_OP_WRITE_SAME
))
942 return q
->limits
.max_write_same_sectors
;
944 if (unlikely(op
== REQ_OP_WRITE_ZEROES
))
945 return q
->limits
.max_write_zeroes_sectors
;
947 return q
->limits
.max_sectors
;
951 * Return maximum size of a request at given offset. Only valid for
952 * file system requests.
954 static inline unsigned int blk_max_size_offset(struct request_queue
*q
,
957 if (!q
->limits
.chunk_sectors
)
958 return q
->limits
.max_sectors
;
960 return min(q
->limits
.max_sectors
, (unsigned int)(q
->limits
.chunk_sectors
-
961 (offset
& (q
->limits
.chunk_sectors
- 1))));
964 static inline unsigned int blk_rq_get_max_sectors(struct request
*rq
,
967 struct request_queue
*q
= rq
->q
;
969 if (blk_rq_is_passthrough(rq
))
970 return q
->limits
.max_hw_sectors
;
972 if (!q
->limits
.chunk_sectors
||
973 req_op(rq
) == REQ_OP_DISCARD
||
974 req_op(rq
) == REQ_OP_SECURE_ERASE
)
975 return blk_queue_get_max_sectors(q
, req_op(rq
));
977 return min(blk_max_size_offset(q
, offset
),
978 blk_queue_get_max_sectors(q
, req_op(rq
)));
981 static inline unsigned int blk_rq_count_bios(struct request
*rq
)
983 unsigned int nr_bios
= 0;
986 __rq_for_each_bio(bio
, rq
)
992 void blk_steal_bios(struct bio_list
*list
, struct request
*rq
);
995 * Request completion related functions.
997 * blk_update_request() completes given number of bytes and updates
998 * the request without completing it.
1000 * blk_end_request() and friends. __blk_end_request() must be called
1001 * with the request queue spinlock acquired.
1003 * Several drivers define their own end_request and call
1004 * blk_end_request() for parts of the original function.
1005 * This prevents code duplication in drivers.
1007 extern bool blk_update_request(struct request
*rq
, blk_status_t error
,
1008 unsigned int nr_bytes
);
1009 extern void blk_end_request_all(struct request
*rq
, blk_status_t error
);
1010 extern bool __blk_end_request(struct request
*rq
, blk_status_t error
,
1011 unsigned int nr_bytes
);
1012 extern void __blk_end_request_all(struct request
*rq
, blk_status_t error
);
1013 extern bool __blk_end_request_cur(struct request
*rq
, blk_status_t error
);
1015 extern void __blk_complete_request(struct request
*);
1016 extern void blk_abort_request(struct request
*);
1019 * Access functions for manipulating queue properties
1021 extern void blk_cleanup_queue(struct request_queue
*);
1022 extern void blk_queue_make_request(struct request_queue
*, make_request_fn
*);
1023 extern void blk_queue_bounce_limit(struct request_queue
*, u64
);
1024 extern void blk_queue_max_hw_sectors(struct request_queue
*, unsigned int);
1025 extern void blk_queue_chunk_sectors(struct request_queue
*, unsigned int);
1026 extern void blk_queue_max_segments(struct request_queue
*, unsigned short);
1027 extern void blk_queue_max_discard_segments(struct request_queue
*,
1029 extern void blk_queue_max_segment_size(struct request_queue
*, unsigned int);
1030 extern void blk_queue_max_discard_sectors(struct request_queue
*q
,
1031 unsigned int max_discard_sectors
);
1032 extern void blk_queue_max_write_same_sectors(struct request_queue
*q
,
1033 unsigned int max_write_same_sectors
);
1034 extern void blk_queue_max_write_zeroes_sectors(struct request_queue
*q
,
1035 unsigned int max_write_same_sectors
);
1036 extern void blk_queue_logical_block_size(struct request_queue
*, unsigned short);
1037 extern void blk_queue_physical_block_size(struct request_queue
*, unsigned int);
1038 extern void blk_queue_alignment_offset(struct request_queue
*q
,
1039 unsigned int alignment
);
1040 extern void blk_limits_io_min(struct queue_limits
*limits
, unsigned int min
);
1041 extern void blk_queue_io_min(struct request_queue
*q
, unsigned int min
);
1042 extern void blk_limits_io_opt(struct queue_limits
*limits
, unsigned int opt
);
1043 extern void blk_queue_io_opt(struct request_queue
*q
, unsigned int opt
);
1044 extern void blk_set_queue_depth(struct request_queue
*q
, unsigned int depth
);
1045 extern void blk_set_default_limits(struct queue_limits
*lim
);
1046 extern void blk_set_stacking_limits(struct queue_limits
*lim
);
1047 extern int blk_stack_limits(struct queue_limits
*t
, struct queue_limits
*b
,
1049 extern int bdev_stack_limits(struct queue_limits
*t
, struct block_device
*bdev
,
1051 extern void disk_stack_limits(struct gendisk
*disk
, struct block_device
*bdev
,
1053 extern void blk_queue_stack_limits(struct request_queue
*t
, struct request_queue
*b
);
1054 extern void blk_queue_dma_pad(struct request_queue
*, unsigned int);
1055 extern void blk_queue_update_dma_pad(struct request_queue
*, unsigned int);
1056 extern int blk_queue_dma_drain(struct request_queue
*q
,
1057 dma_drain_needed_fn
*dma_drain_needed
,
1058 void *buf
, unsigned int size
);
1059 extern void blk_queue_segment_boundary(struct request_queue
*, unsigned long);
1060 extern void blk_queue_virt_boundary(struct request_queue
*, unsigned long);
1061 extern void blk_queue_dma_alignment(struct request_queue
*, int);
1062 extern void blk_queue_update_dma_alignment(struct request_queue
*, int);
1063 extern void blk_queue_rq_timeout(struct request_queue
*, unsigned int);
1064 extern void blk_queue_write_cache(struct request_queue
*q
, bool enabled
, bool fua
);
1067 * Number of physical segments as sent to the device.
1069 * Normally this is the number of discontiguous data segments sent by the
1070 * submitter. But for data-less command like discard we might have no
1071 * actual data segments submitted, but the driver might have to add it's
1072 * own special payload. In that case we still return 1 here so that this
1073 * special payload will be mapped.
1075 static inline unsigned short blk_rq_nr_phys_segments(struct request
*rq
)
1077 if (rq
->rq_flags
& RQF_SPECIAL_PAYLOAD
)
1079 return rq
->nr_phys_segments
;
1083 * Number of discard segments (or ranges) the driver needs to fill in.
1084 * Each discard bio merged into a request is counted as one segment.
1086 static inline unsigned short blk_rq_nr_discard_segments(struct request
*rq
)
1088 return max_t(unsigned short, rq
->nr_phys_segments
, 1);
1091 extern int blk_rq_map_sg(struct request_queue
*, struct request
*, struct scatterlist
*);
1092 extern void blk_dump_rq_flags(struct request
*, char *);
1093 extern long nr_blockdev_pages(void);
1095 bool __must_check
blk_get_queue(struct request_queue
*);
1096 struct request_queue
*blk_alloc_queue(gfp_t
);
1097 struct request_queue
*blk_alloc_queue_node(gfp_t gfp_mask
, int node_id
);
1098 extern void blk_put_queue(struct request_queue
*);
1099 extern void blk_set_queue_dying(struct request_queue
*);
1102 * blk_plug permits building a queue of related requests by holding the I/O
1103 * fragments for a short period. This allows merging of sequential requests
1104 * into single larger request. As the requests are moved from a per-task list to
1105 * the device's request_queue in a batch, this results in improved scalability
1106 * as the lock contention for request_queue lock is reduced.
1108 * It is ok not to disable preemption when adding the request to the plug list
1109 * or when attempting a merge, because blk_schedule_flush_list() will only flush
1110 * the plug list when the task sleeps by itself. For details, please see
1111 * schedule() where blk_schedule_flush_plug() is called.
1114 struct list_head mq_list
; /* blk-mq requests */
1115 struct list_head cb_list
; /* md requires an unplug callback */
1116 unsigned short rq_count
;
1117 bool multiple_queues
;
1119 #define BLK_MAX_REQUEST_COUNT 16
1120 #define BLK_PLUG_FLUSH_SIZE (128 * 1024)
1123 typedef void (*blk_plug_cb_fn
)(struct blk_plug_cb
*, bool);
1124 struct blk_plug_cb
{
1125 struct list_head list
;
1126 blk_plug_cb_fn callback
;
1129 extern struct blk_plug_cb
*blk_check_plugged(blk_plug_cb_fn unplug
,
1130 void *data
, int size
);
1131 extern void blk_start_plug(struct blk_plug
*);
1132 extern void blk_finish_plug(struct blk_plug
*);
1133 extern void blk_flush_plug_list(struct blk_plug
*, bool);
1135 static inline void blk_flush_plug(struct task_struct
*tsk
)
1137 struct blk_plug
*plug
= tsk
->plug
;
1140 blk_flush_plug_list(plug
, false);
1143 static inline void blk_schedule_flush_plug(struct task_struct
*tsk
)
1145 struct blk_plug
*plug
= tsk
->plug
;
1148 blk_flush_plug_list(plug
, true);
1151 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1153 struct blk_plug
*plug
= tsk
->plug
;
1156 (!list_empty(&plug
->mq_list
) ||
1157 !list_empty(&plug
->cb_list
));
1160 extern int blkdev_issue_flush(struct block_device
*, gfp_t
, sector_t
*);
1161 extern int blkdev_issue_write_same(struct block_device
*bdev
, sector_t sector
,
1162 sector_t nr_sects
, gfp_t gfp_mask
, struct page
*page
);
1164 #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */
1166 extern int blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1167 sector_t nr_sects
, gfp_t gfp_mask
, unsigned long flags
);
1168 extern int __blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1169 sector_t nr_sects
, gfp_t gfp_mask
, int flags
,
1172 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
1173 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
1175 extern int __blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1176 sector_t nr_sects
, gfp_t gfp_mask
, struct bio
**biop
,
1178 extern int blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1179 sector_t nr_sects
, gfp_t gfp_mask
, unsigned flags
);
1181 static inline int sb_issue_discard(struct super_block
*sb
, sector_t block
,
1182 sector_t nr_blocks
, gfp_t gfp_mask
, unsigned long flags
)
1184 return blkdev_issue_discard(sb
->s_bdev
,
1185 block
<< (sb
->s_blocksize_bits
-
1187 nr_blocks
<< (sb
->s_blocksize_bits
-
1191 static inline int sb_issue_zeroout(struct super_block
*sb
, sector_t block
,
1192 sector_t nr_blocks
, gfp_t gfp_mask
)
1194 return blkdev_issue_zeroout(sb
->s_bdev
,
1195 block
<< (sb
->s_blocksize_bits
-
1197 nr_blocks
<< (sb
->s_blocksize_bits
-
1202 extern int blk_verify_command(unsigned char *cmd
, fmode_t mode
);
1204 enum blk_default_limits
{
1205 BLK_MAX_SEGMENTS
= 128,
1206 BLK_SAFE_MAX_SECTORS
= 255,
1207 BLK_DEF_MAX_SECTORS
= 2560,
1208 BLK_MAX_SEGMENT_SIZE
= 65536,
1209 BLK_SEG_BOUNDARY_MASK
= 0xFFFFFFFFUL
,
1212 static inline unsigned long queue_segment_boundary(struct request_queue
*q
)
1214 return q
->limits
.seg_boundary_mask
;
1217 static inline unsigned long queue_virt_boundary(struct request_queue
*q
)
1219 return q
->limits
.virt_boundary_mask
;
1222 static inline unsigned int queue_max_sectors(struct request_queue
*q
)
1224 return q
->limits
.max_sectors
;
1227 static inline unsigned int queue_max_hw_sectors(struct request_queue
*q
)
1229 return q
->limits
.max_hw_sectors
;
1232 static inline unsigned short queue_max_segments(struct request_queue
*q
)
1234 return q
->limits
.max_segments
;
1237 static inline unsigned short queue_max_discard_segments(struct request_queue
*q
)
1239 return q
->limits
.max_discard_segments
;
1242 static inline unsigned int queue_max_segment_size(struct request_queue
*q
)
1244 return q
->limits
.max_segment_size
;
1247 static inline unsigned short queue_logical_block_size(struct request_queue
*q
)
1251 if (q
&& q
->limits
.logical_block_size
)
1252 retval
= q
->limits
.logical_block_size
;
1257 static inline unsigned short bdev_logical_block_size(struct block_device
*bdev
)
1259 return queue_logical_block_size(bdev_get_queue(bdev
));
1262 static inline unsigned int queue_physical_block_size(struct request_queue
*q
)
1264 return q
->limits
.physical_block_size
;
1267 static inline unsigned int bdev_physical_block_size(struct block_device
*bdev
)
1269 return queue_physical_block_size(bdev_get_queue(bdev
));
1272 static inline unsigned int queue_io_min(struct request_queue
*q
)
1274 return q
->limits
.io_min
;
1277 static inline int bdev_io_min(struct block_device
*bdev
)
1279 return queue_io_min(bdev_get_queue(bdev
));
1282 static inline unsigned int queue_io_opt(struct request_queue
*q
)
1284 return q
->limits
.io_opt
;
1287 static inline int bdev_io_opt(struct block_device
*bdev
)
1289 return queue_io_opt(bdev_get_queue(bdev
));
1292 static inline int queue_alignment_offset(struct request_queue
*q
)
1294 if (q
->limits
.misaligned
)
1297 return q
->limits
.alignment_offset
;
1300 static inline int queue_limit_alignment_offset(struct queue_limits
*lim
, sector_t sector
)
1302 unsigned int granularity
= max(lim
->physical_block_size
, lim
->io_min
);
1303 unsigned int alignment
= sector_div(sector
, granularity
>> SECTOR_SHIFT
)
1306 return (granularity
+ lim
->alignment_offset
- alignment
) % granularity
;
1309 static inline int bdev_alignment_offset(struct block_device
*bdev
)
1311 struct request_queue
*q
= bdev_get_queue(bdev
);
1313 if (q
->limits
.misaligned
)
1316 if (bdev
!= bdev
->bd_contains
)
1317 return bdev
->bd_part
->alignment_offset
;
1319 return q
->limits
.alignment_offset
;
1322 static inline int queue_discard_alignment(struct request_queue
*q
)
1324 if (q
->limits
.discard_misaligned
)
1327 return q
->limits
.discard_alignment
;
1330 static inline int queue_limit_discard_alignment(struct queue_limits
*lim
, sector_t sector
)
1332 unsigned int alignment
, granularity
, offset
;
1334 if (!lim
->max_discard_sectors
)
1337 /* Why are these in bytes, not sectors? */
1338 alignment
= lim
->discard_alignment
>> SECTOR_SHIFT
;
1339 granularity
= lim
->discard_granularity
>> SECTOR_SHIFT
;
1343 /* Offset of the partition start in 'granularity' sectors */
1344 offset
= sector_div(sector
, granularity
);
1346 /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1347 offset
= (granularity
+ alignment
- offset
) % granularity
;
1349 /* Turn it back into bytes, gaah */
1350 return offset
<< SECTOR_SHIFT
;
1353 static inline int bdev_discard_alignment(struct block_device
*bdev
)
1355 struct request_queue
*q
= bdev_get_queue(bdev
);
1357 if (bdev
!= bdev
->bd_contains
)
1358 return bdev
->bd_part
->discard_alignment
;
1360 return q
->limits
.discard_alignment
;
1363 static inline unsigned int bdev_write_same(struct block_device
*bdev
)
1365 struct request_queue
*q
= bdev_get_queue(bdev
);
1368 return q
->limits
.max_write_same_sectors
;
1373 static inline unsigned int bdev_write_zeroes_sectors(struct block_device
*bdev
)
1375 struct request_queue
*q
= bdev_get_queue(bdev
);
1378 return q
->limits
.max_write_zeroes_sectors
;
1383 static inline enum blk_zoned_model
bdev_zoned_model(struct block_device
*bdev
)
1385 struct request_queue
*q
= bdev_get_queue(bdev
);
1388 return blk_queue_zoned_model(q
);
1390 return BLK_ZONED_NONE
;
1393 static inline bool bdev_is_zoned(struct block_device
*bdev
)
1395 struct request_queue
*q
= bdev_get_queue(bdev
);
1398 return blk_queue_is_zoned(q
);
1403 static inline unsigned int bdev_zone_sectors(struct block_device
*bdev
)
1405 struct request_queue
*q
= bdev_get_queue(bdev
);
1408 return blk_queue_zone_sectors(q
);
1412 static inline int queue_dma_alignment(struct request_queue
*q
)
1414 return q
? q
->dma_alignment
: 511;
1417 static inline int blk_rq_aligned(struct request_queue
*q
, unsigned long addr
,
1420 unsigned int alignment
= queue_dma_alignment(q
) | q
->dma_pad_mask
;
1421 return !(addr
& alignment
) && !(len
& alignment
);
1424 /* assumes size > 256 */
1425 static inline unsigned int blksize_bits(unsigned int size
)
1427 unsigned int bits
= 8;
1431 } while (size
> 256);
1435 static inline unsigned int block_size(struct block_device
*bdev
)
1437 return bdev
->bd_block_size
;
1440 typedef struct {struct page
*v
;} Sector
;
1442 unsigned char *read_dev_sector(struct block_device
*, sector_t
, Sector
*);
1444 static inline void put_dev_sector(Sector p
)
1449 int kblockd_schedule_work(struct work_struct
*work
);
1450 int kblockd_schedule_work_on(int cpu
, struct work_struct
*work
);
1451 int kblockd_mod_delayed_work_on(int cpu
, struct delayed_work
*dwork
, unsigned long delay
);
1453 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1454 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1455 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1456 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1458 #if defined(CONFIG_BLK_DEV_INTEGRITY)
1460 enum blk_integrity_flags
{
1461 BLK_INTEGRITY_VERIFY
= 1 << 0,
1462 BLK_INTEGRITY_GENERATE
= 1 << 1,
1463 BLK_INTEGRITY_DEVICE_CAPABLE
= 1 << 2,
1464 BLK_INTEGRITY_IP_CHECKSUM
= 1 << 3,
1467 struct blk_integrity_iter
{
1471 unsigned int data_size
;
1472 unsigned short interval
;
1473 const char *disk_name
;
1476 typedef blk_status_t (integrity_processing_fn
) (struct blk_integrity_iter
*);
1478 struct blk_integrity_profile
{
1479 integrity_processing_fn
*generate_fn
;
1480 integrity_processing_fn
*verify_fn
;
1484 extern void blk_integrity_register(struct gendisk
*, struct blk_integrity
*);
1485 extern void blk_integrity_unregister(struct gendisk
*);
1486 extern int blk_integrity_compare(struct gendisk
*, struct gendisk
*);
1487 extern int blk_rq_map_integrity_sg(struct request_queue
*, struct bio
*,
1488 struct scatterlist
*);
1489 extern int blk_rq_count_integrity_sg(struct request_queue
*, struct bio
*);
1490 extern bool blk_integrity_merge_rq(struct request_queue
*, struct request
*,
1492 extern bool blk_integrity_merge_bio(struct request_queue
*, struct request
*,
1495 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1497 struct blk_integrity
*bi
= &disk
->queue
->integrity
;
1506 struct blk_integrity
*bdev_get_integrity(struct block_device
*bdev
)
1508 return blk_get_integrity(bdev
->bd_disk
);
1511 static inline bool blk_integrity_rq(struct request
*rq
)
1513 return rq
->cmd_flags
& REQ_INTEGRITY
;
1516 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1519 q
->limits
.max_integrity_segments
= segs
;
1522 static inline unsigned short
1523 queue_max_integrity_segments(struct request_queue
*q
)
1525 return q
->limits
.max_integrity_segments
;
1529 * bio_integrity_intervals - Return number of integrity intervals for a bio
1530 * @bi: blk_integrity profile for device
1531 * @sectors: Size of the bio in 512-byte sectors
1533 * Description: The block layer calculates everything in 512 byte
1534 * sectors but integrity metadata is done in terms of the data integrity
1535 * interval size of the storage device. Convert the block layer sectors
1536 * to the appropriate number of integrity intervals.
1538 static inline unsigned int bio_integrity_intervals(struct blk_integrity
*bi
,
1539 unsigned int sectors
)
1541 return sectors
>> (bi
->interval_exp
- 9);
1544 static inline unsigned int bio_integrity_bytes(struct blk_integrity
*bi
,
1545 unsigned int sectors
)
1547 return bio_integrity_intervals(bi
, sectors
) * bi
->tuple_size
;
1550 #else /* CONFIG_BLK_DEV_INTEGRITY */
1553 struct block_device
;
1555 struct blk_integrity
;
1557 static inline int blk_integrity_rq(struct request
*rq
)
1561 static inline int blk_rq_count_integrity_sg(struct request_queue
*q
,
1566 static inline int blk_rq_map_integrity_sg(struct request_queue
*q
,
1568 struct scatterlist
*s
)
1572 static inline struct blk_integrity
*bdev_get_integrity(struct block_device
*b
)
1576 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1580 static inline int blk_integrity_compare(struct gendisk
*a
, struct gendisk
*b
)
1584 static inline void blk_integrity_register(struct gendisk
*d
,
1585 struct blk_integrity
*b
)
1588 static inline void blk_integrity_unregister(struct gendisk
*d
)
1591 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1595 static inline unsigned short queue_max_integrity_segments(struct request_queue
*q
)
1599 static inline bool blk_integrity_merge_rq(struct request_queue
*rq
,
1605 static inline bool blk_integrity_merge_bio(struct request_queue
*rq
,
1612 static inline unsigned int bio_integrity_intervals(struct blk_integrity
*bi
,
1613 unsigned int sectors
)
1618 static inline unsigned int bio_integrity_bytes(struct blk_integrity
*bi
,
1619 unsigned int sectors
)
1624 #endif /* CONFIG_BLK_DEV_INTEGRITY */
1626 struct block_device_operations
{
1627 int (*open
) (struct block_device
*, fmode_t
);
1628 void (*release
) (struct gendisk
*, fmode_t
);
1629 int (*rw_page
)(struct block_device
*, sector_t
, struct page
*, unsigned int);
1630 int (*ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1631 int (*compat_ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1632 unsigned int (*check_events
) (struct gendisk
*disk
,
1633 unsigned int clearing
);
1634 /* ->media_changed() is DEPRECATED, use ->check_events() instead */
1635 int (*media_changed
) (struct gendisk
*);
1636 void (*unlock_native_capacity
) (struct gendisk
*);
1637 int (*revalidate_disk
) (struct gendisk
*);
1638 int (*getgeo
)(struct block_device
*, struct hd_geometry
*);
1639 /* this callback is with swap_lock and sometimes page table lock held */
1640 void (*swap_slot_free_notify
) (struct block_device
*, unsigned long);
1641 int (*report_zones
)(struct gendisk
*, sector_t sector
,
1642 struct blk_zone
*zones
, unsigned int *nr_zones
,
1644 struct module
*owner
;
1645 const struct pr_ops
*pr_ops
;
1648 extern int __blkdev_driver_ioctl(struct block_device
*, fmode_t
, unsigned int,
1650 extern int bdev_read_page(struct block_device
*, sector_t
, struct page
*);
1651 extern int bdev_write_page(struct block_device
*, sector_t
, struct page
*,
1652 struct writeback_control
*);
1654 #ifdef CONFIG_BLK_DEV_ZONED
1655 bool blk_req_needs_zone_write_lock(struct request
*rq
);
1656 void __blk_req_zone_write_lock(struct request
*rq
);
1657 void __blk_req_zone_write_unlock(struct request
*rq
);
1659 static inline void blk_req_zone_write_lock(struct request
*rq
)
1661 if (blk_req_needs_zone_write_lock(rq
))
1662 __blk_req_zone_write_lock(rq
);
1665 static inline void blk_req_zone_write_unlock(struct request
*rq
)
1667 if (rq
->rq_flags
& RQF_ZONE_WRITE_LOCKED
)
1668 __blk_req_zone_write_unlock(rq
);
1671 static inline bool blk_req_zone_is_write_locked(struct request
*rq
)
1673 return rq
->q
->seq_zones_wlock
&&
1674 test_bit(blk_rq_zone_no(rq
), rq
->q
->seq_zones_wlock
);
1677 static inline bool blk_req_can_dispatch_to_zone(struct request
*rq
)
1679 if (!blk_req_needs_zone_write_lock(rq
))
1681 return !blk_req_zone_is_write_locked(rq
);
1684 static inline bool blk_req_needs_zone_write_lock(struct request
*rq
)
1689 static inline void blk_req_zone_write_lock(struct request
*rq
)
1693 static inline void blk_req_zone_write_unlock(struct request
*rq
)
1696 static inline bool blk_req_zone_is_write_locked(struct request
*rq
)
1701 static inline bool blk_req_can_dispatch_to_zone(struct request
*rq
)
1705 #endif /* CONFIG_BLK_DEV_ZONED */
1707 #else /* CONFIG_BLOCK */
1709 struct block_device
;
1712 * stubs for when the block layer is configured out
1714 #define buffer_heads_over_limit 0
1716 static inline long nr_blockdev_pages(void)
1724 static inline void blk_start_plug(struct blk_plug
*plug
)
1728 static inline void blk_finish_plug(struct blk_plug
*plug
)
1732 static inline void blk_flush_plug(struct task_struct
*task
)
1736 static inline void blk_schedule_flush_plug(struct task_struct
*task
)
1741 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1746 static inline int blkdev_issue_flush(struct block_device
*bdev
, gfp_t gfp_mask
,
1747 sector_t
*error_sector
)
1752 #endif /* CONFIG_BLOCK */
1754 static inline void blk_wake_io_task(struct task_struct
*waiter
)
1757 * If we're polling, the task itself is doing the completions. For
1758 * that case, we don't need to signal a wakeup, it's enough to just
1759 * mark us as RUNNING.
1761 if (waiter
== current
)
1762 __set_current_state(TASK_RUNNING
);
1764 wake_up_process(waiter
);