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>
7 #include <linux/major.h>
8 #include <linux/genhd.h>
9 #include <linux/list.h>
10 #include <linux/llist.h>
11 #include <linux/timer.h>
12 #include <linux/workqueue.h>
13 #include <linux/pagemap.h>
14 #include <linux/backing-dev-defs.h>
15 #include <linux/wait.h>
16 #include <linux/mempool.h>
17 #include <linux/pfn.h>
18 #include <linux/bio.h>
19 #include <linux/stringify.h>
20 #include <linux/gfp.h>
21 #include <linux/bsg.h>
22 #include <linux/smp.h>
23 #include <linux/rcupdate.h>
24 #include <linux/percpu-refcount.h>
25 #include <linux/scatterlist.h>
26 #include <linux/blkzoned.h>
30 struct scsi_ioctl_command;
33 struct elevator_queue;
39 struct blk_flush_queue;
42 struct blk_queue_stats;
43 struct blk_stat_callback;
44 struct blk_keyslot_manager;
46 #define BLKDEV_MIN_RQ 4
47 #define BLKDEV_MAX_RQ 128 /* Default maximum */
49 /* Must be consistent with blk_mq_poll_stats_bkt() */
50 #define BLK_MQ_POLL_STATS_BKTS 16
52 /* Doing classic polling */
53 #define BLK_MQ_POLL_CLASSIC -1
56 * Maximum number of blkcg policies allowed to be registered concurrently.
57 * Defined here to simplify include dependency.
59 #define BLKCG_MAX_POLS 5
61 typedef void (rq_end_io_fn)(struct request *, blk_status_t);
65 typedef __u32 __bitwise req_flags_t;
67 /* elevator knows about this request */
68 #define RQF_SORTED ((__force req_flags_t)(1 << 0))
69 /* drive already may have started this one */
70 #define RQF_STARTED ((__force req_flags_t)(1 << 1))
71 /* may not be passed by ioscheduler */
72 #define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3))
73 /* request for flush sequence */
74 #define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4))
75 /* merge of different types, fail separately */
76 #define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5))
77 /* track inflight for MQ */
78 #define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6))
79 /* don't call prep for this one */
80 #define RQF_DONTPREP ((__force req_flags_t)(1 << 7))
81 /* set for "ide_preempt" requests and also for requests for which the SCSI
82 "quiesce" state must be ignored. */
83 #define RQF_PREEMPT ((__force req_flags_t)(1 << 8))
84 /* vaguely specified driver internal error. Ignored by the block layer */
85 #define RQF_FAILED ((__force req_flags_t)(1 << 10))
86 /* don't warn about errors */
87 #define RQF_QUIET ((__force req_flags_t)(1 << 11))
88 /* elevator private data attached */
89 #define RQF_ELVPRIV ((__force req_flags_t)(1 << 12))
90 /* account into disk and partition IO statistics */
91 #define RQF_IO_STAT ((__force req_flags_t)(1 << 13))
92 /* request came from our alloc pool */
93 #define RQF_ALLOCED ((__force req_flags_t)(1 << 14))
94 /* runtime pm request */
95 #define RQF_PM ((__force req_flags_t)(1 << 15))
96 /* on IO scheduler merge hash */
97 #define RQF_HASHED ((__force req_flags_t)(1 << 16))
98 /* track IO completion time */
99 #define RQF_STATS ((__force req_flags_t)(1 << 17))
100 /* Look at ->special_vec for the actual data payload instead of the
102 #define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18))
103 /* The per-zone write lock is held for this request */
104 #define RQF_ZONE_WRITE_LOCKED ((__force req_flags_t)(1 << 19))
105 /* already slept for hybrid poll */
106 #define RQF_MQ_POLL_SLEPT ((__force req_flags_t)(1 << 20))
107 /* ->timeout has been called, don't expire again */
108 #define RQF_TIMED_OUT ((__force req_flags_t)(1 << 21))
110 /* flags that prevent us from merging requests: */
111 #define RQF_NOMERGE_FLAGS \
112 (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD)
115 * Request state for blk-mq.
124 * Try to put the fields that are referenced together in the same cacheline.
126 * If you modify this structure, make sure to update blk_rq_init() and
127 * especially blk_mq_rq_ctx_init() to take care of the added fields.
130 struct request_queue *q;
131 struct blk_mq_ctx *mq_ctx;
132 struct blk_mq_hw_ctx *mq_hctx;
134 unsigned int cmd_flags; /* op and common flags */
135 req_flags_t rq_flags;
140 /* the following two fields are internal, NEVER access directly */
141 unsigned int __data_len; /* total data len */
142 sector_t __sector; /* sector cursor */
147 struct list_head queuelist;
150 * The hash is used inside the scheduler, and killed once the
151 * request reaches the dispatch list. The ipi_list is only used
152 * to queue the request for softirq completion, which is long
153 * after the request has been unhashed (and even removed from
154 * the dispatch list).
157 struct hlist_node hash; /* merge hash */
158 struct list_head ipi_list;
162 * The rb_node is only used inside the io scheduler, requests
163 * are pruned when moved to the dispatch queue. So let the
164 * completion_data share space with the rb_node.
167 struct rb_node rb_node; /* sort/lookup */
168 struct bio_vec special_vec;
169 void *completion_data;
170 int error_count; /* for legacy drivers, don't use */
174 * Three pointers are available for the IO schedulers, if they need
175 * more they have to dynamically allocate it. Flush requests are
176 * never put on the IO scheduler. So let the flush fields share
177 * space with the elevator data.
187 struct list_head list;
188 rq_end_io_fn *saved_end_io;
192 struct gendisk *rq_disk;
193 struct hd_struct *part;
194 #ifdef CONFIG_BLK_RQ_ALLOC_TIME
195 /* Time that the first bio started allocating this request. */
198 /* Time that this request was allocated for this IO. */
200 /* Time that I/O was submitted to the device. */
201 u64 io_start_time_ns;
203 #ifdef CONFIG_BLK_WBT
204 unsigned short wbt_flags;
207 * rq sectors used for blk stats. It has the same value
208 * with blk_rq_sectors(rq), except that it never be zeroed
211 unsigned short stats_sectors;
214 * Number of scatter-gather DMA addr+len pairs after
215 * physical address coalescing is performed.
217 unsigned short nr_phys_segments;
219 #if defined(CONFIG_BLK_DEV_INTEGRITY)
220 unsigned short nr_integrity_segments;
223 #ifdef CONFIG_BLK_INLINE_ENCRYPTION
224 struct bio_crypt_ctx *crypt_ctx;
225 struct blk_ksm_keyslot *crypt_keyslot;
228 unsigned short write_hint;
229 unsigned short ioprio;
231 enum mq_rq_state state;
234 unsigned int timeout;
235 unsigned long deadline;
238 struct __call_single_data csd;
243 * completion callback.
245 rq_end_io_fn *end_io;
249 static inline bool blk_op_is_scsi(unsigned int op)
251 return op == REQ_OP_SCSI_IN || op == REQ_OP_SCSI_OUT;
254 static inline bool blk_op_is_private(unsigned int op)
256 return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT;
259 static inline bool blk_rq_is_scsi(struct request *rq)
261 return blk_op_is_scsi(req_op(rq));
264 static inline bool blk_rq_is_private(struct request *rq)
266 return blk_op_is_private(req_op(rq));
269 static inline bool blk_rq_is_passthrough(struct request *rq)
271 return blk_rq_is_scsi(rq) || blk_rq_is_private(rq);
274 static inline bool bio_is_passthrough(struct bio *bio)
276 unsigned op = bio_op(bio);
278 return blk_op_is_scsi(op) || blk_op_is_private(op);
281 static inline unsigned short req_get_ioprio(struct request *req)
286 #include <linux/elevator.h>
288 struct blk_queue_ctx;
292 enum blk_eh_timer_return {
293 BLK_EH_DONE, /* drivers has completed the command */
294 BLK_EH_RESET_TIMER, /* reset timer and try again */
297 enum blk_queue_state {
302 #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */
303 #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */
305 #define BLK_SCSI_MAX_CMDS (256)
306 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
309 * Zoned block device models (zoned limit).
311 * Note: This needs to be ordered from the least to the most severe
312 * restrictions for the inheritance in blk_stack_limits() to work.
314 enum blk_zoned_model {
315 BLK_ZONED_NONE = 0, /* Regular block device */
316 BLK_ZONED_HA, /* Host-aware zoned block device */
317 BLK_ZONED_HM, /* Host-managed zoned block device */
320 struct queue_limits {
321 unsigned long bounce_pfn;
322 unsigned long seg_boundary_mask;
323 unsigned long virt_boundary_mask;
325 unsigned int max_hw_sectors;
326 unsigned int max_dev_sectors;
327 unsigned int chunk_sectors;
328 unsigned int max_sectors;
329 unsigned int max_segment_size;
330 unsigned int physical_block_size;
331 unsigned int logical_block_size;
332 unsigned int alignment_offset;
335 unsigned int max_discard_sectors;
336 unsigned int max_hw_discard_sectors;
337 unsigned int max_write_same_sectors;
338 unsigned int max_write_zeroes_sectors;
339 unsigned int max_zone_append_sectors;
340 unsigned int discard_granularity;
341 unsigned int discard_alignment;
343 unsigned short max_segments;
344 unsigned short max_integrity_segments;
345 unsigned short max_discard_segments;
347 unsigned char misaligned;
348 unsigned char discard_misaligned;
349 unsigned char raid_partial_stripes_expensive;
350 enum blk_zoned_model zoned;
353 typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx,
356 #ifdef CONFIG_BLK_DEV_ZONED
358 #define BLK_ALL_ZONES ((unsigned int)-1)
359 int blkdev_report_zones(struct block_device *bdev, sector_t sector,
360 unsigned int nr_zones, report_zones_cb cb, void *data);
361 unsigned int blkdev_nr_zones(struct gendisk *disk);
362 extern int blkdev_zone_mgmt(struct block_device *bdev, enum req_opf op,
363 sector_t sectors, sector_t nr_sectors,
365 int blk_revalidate_disk_zones(struct gendisk *disk,
366 void (*update_driver_data)(struct gendisk *disk));
368 extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
369 unsigned int cmd, unsigned long arg);
370 extern int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode,
371 unsigned int cmd, unsigned long arg);
373 #else /* CONFIG_BLK_DEV_ZONED */
375 static inline unsigned int blkdev_nr_zones(struct gendisk *disk)
380 static inline int blkdev_report_zones_ioctl(struct block_device *bdev,
381 fmode_t mode, unsigned int cmd,
387 static inline int blkdev_zone_mgmt_ioctl(struct block_device *bdev,
388 fmode_t mode, unsigned int cmd,
394 #endif /* CONFIG_BLK_DEV_ZONED */
396 struct request_queue {
397 struct request *last_merge;
398 struct elevator_queue *elevator;
400 struct blk_queue_stats *stats;
401 struct rq_qos *rq_qos;
403 const struct blk_mq_ops *mq_ops;
406 struct blk_mq_ctx __percpu *queue_ctx;
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 */
462 enum rpm_status rpm_status;
463 unsigned int nr_pending;
469 unsigned long nr_requests; /* Max # of requests */
471 unsigned int dma_pad_mask;
472 unsigned int dma_alignment;
474 #ifdef CONFIG_BLK_INLINE_ENCRYPTION
475 /* Inline crypto capabilities */
476 struct blk_keyslot_manager *ksm;
479 unsigned int rq_timeout;
482 struct blk_stat_callback *poll_cb;
483 struct blk_rq_stat poll_stat[BLK_MQ_POLL_STATS_BKTS];
485 struct timer_list timeout;
486 struct work_struct timeout_work;
488 atomic_t nr_active_requests_shared_sbitmap;
490 struct list_head icq_list;
491 #ifdef CONFIG_BLK_CGROUP
492 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
493 struct blkcg_gq *root_blkg;
494 struct list_head blkg_list;
497 struct queue_limits limits;
499 unsigned int required_elevator_features;
501 #ifdef CONFIG_BLK_DEV_ZONED
503 * Zoned block device information for request dispatch control.
504 * nr_zones is the total number of zones of the device. This is always
505 * 0 for regular block devices. conv_zones_bitmap is a bitmap of nr_zones
506 * bits which indicates if a zone is conventional (bit set) or
507 * sequential (bit clear). seq_zones_wlock is a bitmap of nr_zones
508 * bits which indicates if a zone is write locked, that is, if a write
509 * request targeting the zone was dispatched. All three fields are
510 * initialized by the low level device driver (e.g. scsi/sd.c).
511 * Stacking drivers (device mappers) may or may not initialize
514 * Reads of this information must be protected with blk_queue_enter() /
515 * blk_queue_exit(). Modifying this information is only allowed while
516 * no requests are being processed. See also blk_mq_freeze_queue() and
517 * blk_mq_unfreeze_queue().
519 unsigned int nr_zones;
520 unsigned long *conv_zones_bitmap;
521 unsigned long *seq_zones_wlock;
522 unsigned int max_open_zones;
523 unsigned int max_active_zones;
524 #endif /* CONFIG_BLK_DEV_ZONED */
529 unsigned int sg_timeout;
530 unsigned int sg_reserved_size;
532 struct mutex debugfs_mutex;
533 #ifdef CONFIG_BLK_DEV_IO_TRACE
534 struct blk_trace __rcu *blk_trace;
537 * for flush operations
539 struct blk_flush_queue *fq;
541 struct list_head requeue_list;
542 spinlock_t requeue_lock;
543 struct delayed_work requeue_work;
545 struct mutex sysfs_lock;
546 struct mutex sysfs_dir_lock;
549 * for reusing dead hctx instance in case of updating
552 struct list_head unused_hctx_list;
553 spinlock_t unused_hctx_lock;
557 #if defined(CONFIG_BLK_DEV_BSG)
558 struct bsg_class_device bsg_dev;
561 #ifdef CONFIG_BLK_DEV_THROTTLING
563 struct throtl_data *td;
565 struct rcu_head rcu_head;
566 wait_queue_head_t mq_freeze_wq;
568 * Protect concurrent access to q_usage_counter by
569 * percpu_ref_kill() and percpu_ref_reinit().
571 struct mutex mq_freeze_lock;
572 struct percpu_ref q_usage_counter;
574 struct blk_mq_tag_set *tag_set;
575 struct list_head tag_set_list;
576 struct bio_set bio_split;
578 struct dentry *debugfs_dir;
580 #ifdef CONFIG_BLK_DEBUG_FS
581 struct dentry *sched_debugfs_dir;
582 struct dentry *rqos_debugfs_dir;
585 bool mq_sysfs_init_done;
589 #define BLK_MAX_WRITE_HINTS 5
590 u64 write_hints[BLK_MAX_WRITE_HINTS];
593 /* Keep blk_queue_flag_name[] in sync with the definitions below */
594 #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */
595 #define QUEUE_FLAG_DYING 1 /* queue being torn down */
596 #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */
597 #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */
598 #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */
599 #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */
600 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
601 #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */
602 #define QUEUE_FLAG_DISCARD 8 /* supports DISCARD */
603 #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */
604 #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */
605 #define QUEUE_FLAG_SECERASE 11 /* supports secure erase */
606 #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */
607 #define QUEUE_FLAG_DEAD 13 /* queue tear-down finished */
608 #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */
609 #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */
610 #define QUEUE_FLAG_WC 17 /* Write back caching */
611 #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */
612 #define QUEUE_FLAG_DAX 19 /* device supports DAX */
613 #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */
614 #define QUEUE_FLAG_POLL_STATS 21 /* collecting stats for hybrid polling */
615 #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */
616 #define QUEUE_FLAG_SCSI_PASSTHROUGH 23 /* queue supports SCSI commands */
617 #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */
618 #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */
619 #define QUEUE_FLAG_ZONE_RESETALL 26 /* supports Zone Reset All */
620 #define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */
621 #define QUEUE_FLAG_HCTX_ACTIVE 28 /* at least one blk-mq hctx is active */
623 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
624 (1 << QUEUE_FLAG_SAME_COMP))
626 void blk_queue_flag_set(unsigned int flag, struct request_queue *q);
627 void blk_queue_flag_clear(unsigned int flag, struct request_queue *q);
628 bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
630 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
631 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
632 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
633 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
634 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
635 #define blk_queue_noxmerges(q) \
636 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
637 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
638 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
639 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
640 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
641 #define blk_queue_zone_resetall(q) \
642 test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags)
643 #define blk_queue_secure_erase(q) \
644 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
645 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
646 #define blk_queue_scsi_passthrough(q) \
647 test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags)
648 #define blk_queue_pci_p2pdma(q) \
649 test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags)
650 #ifdef CONFIG_BLK_RQ_ALLOC_TIME
651 #define blk_queue_rq_alloc_time(q) \
652 test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags)
654 #define blk_queue_rq_alloc_time(q) false
657 #define blk_noretry_request(rq) \
658 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
659 REQ_FAILFAST_DRIVER))
660 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
661 #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only)
662 #define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags)
663 #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags)
665 extern void blk_set_pm_only(struct request_queue *q);
666 extern void blk_clear_pm_only(struct request_queue *q);
668 static inline bool blk_account_rq(struct request *rq)
670 return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq);
673 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
675 #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ)
677 #define rq_dma_dir(rq) \
678 (op_is_write(req_op(rq)) ? DMA_TO_DEVICE : DMA_FROM_DEVICE)
680 #define dma_map_bvec(dev, bv, dir, attrs) \
681 dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \
684 static inline bool queue_is_mq(struct request_queue *q)
689 static inline enum blk_zoned_model
690 blk_queue_zoned_model(struct request_queue *q)
692 return q->limits.zoned;
695 static inline bool blk_queue_is_zoned(struct request_queue *q)
697 switch (blk_queue_zoned_model(q)) {
706 static inline sector_t blk_queue_zone_sectors(struct request_queue *q)
708 return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0;
711 #ifdef CONFIG_BLK_DEV_ZONED
712 static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
714 return blk_queue_is_zoned(q) ? q->nr_zones : 0;
717 static inline unsigned int blk_queue_zone_no(struct request_queue *q,
720 if (!blk_queue_is_zoned(q))
722 return sector >> ilog2(q->limits.chunk_sectors);
725 static inline bool blk_queue_zone_is_seq(struct request_queue *q,
728 if (!blk_queue_is_zoned(q))
730 if (!q->conv_zones_bitmap)
732 return !test_bit(blk_queue_zone_no(q, sector), q->conv_zones_bitmap);
735 static inline void blk_queue_max_open_zones(struct request_queue *q,
736 unsigned int max_open_zones)
738 q->max_open_zones = max_open_zones;
741 static inline unsigned int queue_max_open_zones(const struct request_queue *q)
743 return q->max_open_zones;
746 static inline void blk_queue_max_active_zones(struct request_queue *q,
747 unsigned int max_active_zones)
749 q->max_active_zones = max_active_zones;
752 static inline unsigned int queue_max_active_zones(const struct request_queue *q)
754 return q->max_active_zones;
756 #else /* CONFIG_BLK_DEV_ZONED */
757 static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
761 static inline bool blk_queue_zone_is_seq(struct request_queue *q,
766 static inline unsigned int blk_queue_zone_no(struct request_queue *q,
771 static inline unsigned int queue_max_open_zones(const struct request_queue *q)
775 static inline unsigned int queue_max_active_zones(const struct request_queue *q)
779 #endif /* CONFIG_BLK_DEV_ZONED */
781 static inline bool rq_is_sync(struct request *rq)
783 return op_is_sync(rq->cmd_flags);
786 static inline bool rq_mergeable(struct request *rq)
788 if (blk_rq_is_passthrough(rq))
791 if (req_op(rq) == REQ_OP_FLUSH)
794 if (req_op(rq) == REQ_OP_WRITE_ZEROES)
797 if (req_op(rq) == REQ_OP_ZONE_APPEND)
800 if (rq->cmd_flags & REQ_NOMERGE_FLAGS)
802 if (rq->rq_flags & RQF_NOMERGE_FLAGS)
808 static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b)
810 if (bio_page(a) == bio_page(b) &&
811 bio_offset(a) == bio_offset(b))
817 static inline unsigned int blk_queue_depth(struct request_queue *q)
820 return q->queue_depth;
822 return q->nr_requests;
825 extern unsigned long blk_max_low_pfn, blk_max_pfn;
828 * standard bounce addresses:
830 * BLK_BOUNCE_HIGH : bounce all highmem pages
831 * BLK_BOUNCE_ANY : don't bounce anything
832 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
835 #if BITS_PER_LONG == 32
836 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
838 #define BLK_BOUNCE_HIGH -1ULL
840 #define BLK_BOUNCE_ANY (-1ULL)
841 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
844 * default timeout for SG_IO if none specified
846 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
847 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
853 unsigned long offset;
858 struct req_iterator {
859 struct bvec_iter iter;
863 /* This should not be used directly - use rq_for_each_segment */
864 #define for_each_bio(_bio) \
865 for (; _bio; _bio = _bio->bi_next)
866 #define __rq_for_each_bio(_bio, rq) \
868 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
870 #define rq_for_each_segment(bvl, _rq, _iter) \
871 __rq_for_each_bio(_iter.bio, _rq) \
872 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
874 #define rq_for_each_bvec(bvl, _rq, _iter) \
875 __rq_for_each_bio(_iter.bio, _rq) \
876 bio_for_each_bvec(bvl, _iter.bio, _iter.iter)
878 #define rq_iter_last(bvec, _iter) \
879 (_iter.bio->bi_next == NULL && \
880 bio_iter_last(bvec, _iter.iter))
882 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
883 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
885 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
886 extern void rq_flush_dcache_pages(struct request *rq);
888 static inline void rq_flush_dcache_pages(struct request *rq)
893 extern int blk_register_queue(struct gendisk *disk);
894 extern void blk_unregister_queue(struct gendisk *disk);
895 blk_qc_t submit_bio_noacct(struct bio *bio);
896 extern void blk_rq_init(struct request_queue *q, struct request *rq);
897 extern void blk_put_request(struct request *);
898 extern struct request *blk_get_request(struct request_queue *, unsigned int op,
899 blk_mq_req_flags_t flags);
900 extern int blk_lld_busy(struct request_queue *q);
901 extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
902 struct bio_set *bs, gfp_t gfp_mask,
903 int (*bio_ctr)(struct bio *, struct bio *, void *),
905 extern void blk_rq_unprep_clone(struct request *rq);
906 extern blk_status_t blk_insert_cloned_request(struct request_queue *q,
908 extern int blk_rq_append_bio(struct request *rq, struct bio **bio);
909 extern void blk_queue_split(struct bio **);
910 extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int);
911 extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t,
912 unsigned int, void __user *);
913 extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
914 unsigned int, void __user *);
915 extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
916 struct scsi_ioctl_command __user *);
917 extern int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp);
918 extern int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp);
920 extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags);
921 extern void blk_queue_exit(struct request_queue *q);
922 extern void blk_sync_queue(struct request_queue *q);
923 extern int blk_rq_map_user(struct request_queue *, struct request *,
924 struct rq_map_data *, void __user *, unsigned long,
926 extern int blk_rq_unmap_user(struct bio *);
927 extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t);
928 extern int blk_rq_map_user_iov(struct request_queue *, struct request *,
929 struct rq_map_data *, const struct iov_iter *,
931 extern void blk_execute_rq(struct request_queue *, struct gendisk *,
932 struct request *, int);
933 extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
934 struct request *, int, rq_end_io_fn *);
936 /* Helper to convert REQ_OP_XXX to its string format XXX */
937 extern const char *blk_op_str(unsigned int op);
939 int blk_status_to_errno(blk_status_t status);
940 blk_status_t errno_to_blk_status(int errno);
942 int blk_poll(struct request_queue *q, blk_qc_t cookie, bool spin);
944 static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
946 return bdev->bd_disk->queue; /* this is never NULL */
950 * The basic unit of block I/O is a sector. It is used in a number of contexts
951 * in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9
952 * bytes. Variables of type sector_t represent an offset or size that is a
953 * multiple of 512 bytes. Hence these two constants.
956 #define SECTOR_SHIFT 9
959 #define SECTOR_SIZE (1 << SECTOR_SHIFT)
963 * blk_rq_pos() : the current sector
964 * blk_rq_bytes() : bytes left in the entire request
965 * blk_rq_cur_bytes() : bytes left in the current segment
966 * blk_rq_err_bytes() : bytes left till the next error boundary
967 * blk_rq_sectors() : sectors left in the entire request
968 * blk_rq_cur_sectors() : sectors left in the current segment
969 * blk_rq_stats_sectors() : sectors of the entire request used for stats
971 static inline sector_t blk_rq_pos(const struct request *rq)
976 static inline unsigned int blk_rq_bytes(const struct request *rq)
978 return rq->__data_len;
981 static inline int blk_rq_cur_bytes(const struct request *rq)
983 return rq->bio ? bio_cur_bytes(rq->bio) : 0;
986 extern unsigned int blk_rq_err_bytes(const struct request *rq);
988 static inline unsigned int blk_rq_sectors(const struct request *rq)
990 return blk_rq_bytes(rq) >> SECTOR_SHIFT;
993 static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
995 return blk_rq_cur_bytes(rq) >> SECTOR_SHIFT;
998 static inline unsigned int blk_rq_stats_sectors(const struct request *rq)
1000 return rq->stats_sectors;
1003 #ifdef CONFIG_BLK_DEV_ZONED
1005 /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */
1006 const char *blk_zone_cond_str(enum blk_zone_cond zone_cond);
1008 static inline unsigned int blk_rq_zone_no(struct request *rq)
1010 return blk_queue_zone_no(rq->q, blk_rq_pos(rq));
1013 static inline unsigned int blk_rq_zone_is_seq(struct request *rq)
1015 return blk_queue_zone_is_seq(rq->q, blk_rq_pos(rq));
1017 #endif /* CONFIG_BLK_DEV_ZONED */
1020 * Some commands like WRITE SAME have a payload or data transfer size which
1021 * is different from the size of the request. Any driver that supports such
1022 * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to
1023 * calculate the data transfer size.
1025 static inline unsigned int blk_rq_payload_bytes(struct request *rq)
1027 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1028 return rq->special_vec.bv_len;
1029 return blk_rq_bytes(rq);
1033 * Return the first full biovec in the request. The caller needs to check that
1034 * there are any bvecs before calling this helper.
1036 static inline struct bio_vec req_bvec(struct request *rq)
1038 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1039 return rq->special_vec;
1040 return mp_bvec_iter_bvec(rq->bio->bi_io_vec, rq->bio->bi_iter);
1043 static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
1046 if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE))
1047 return min(q->limits.max_discard_sectors,
1048 UINT_MAX >> SECTOR_SHIFT);
1050 if (unlikely(op == REQ_OP_WRITE_SAME))
1051 return q->limits.max_write_same_sectors;
1053 if (unlikely(op == REQ_OP_WRITE_ZEROES))
1054 return q->limits.max_write_zeroes_sectors;
1056 return q->limits.max_sectors;
1060 * Return maximum size of a request at given offset. Only valid for
1061 * file system requests.
1063 static inline unsigned int blk_max_size_offset(struct request_queue *q,
1066 unsigned int chunk_sectors = q->limits.chunk_sectors;
1069 return q->limits.max_sectors;
1071 if (likely(is_power_of_2(chunk_sectors)))
1072 chunk_sectors -= offset & (chunk_sectors - 1);
1074 chunk_sectors -= sector_div(offset, chunk_sectors);
1076 return min(q->limits.max_sectors, chunk_sectors);
1079 static inline unsigned int blk_rq_get_max_sectors(struct request *rq,
1082 struct request_queue *q = rq->q;
1084 if (blk_rq_is_passthrough(rq))
1085 return q->limits.max_hw_sectors;
1087 if (!q->limits.chunk_sectors ||
1088 req_op(rq) == REQ_OP_DISCARD ||
1089 req_op(rq) == REQ_OP_SECURE_ERASE)
1090 return blk_queue_get_max_sectors(q, req_op(rq));
1092 return min(blk_max_size_offset(q, offset),
1093 blk_queue_get_max_sectors(q, req_op(rq)));
1096 static inline unsigned int blk_rq_count_bios(struct request *rq)
1098 unsigned int nr_bios = 0;
1101 __rq_for_each_bio(bio, rq)
1107 void blk_steal_bios(struct bio_list *list, struct request *rq);
1110 * Request completion related functions.
1112 * blk_update_request() completes given number of bytes and updates
1113 * the request without completing it.
1115 extern bool blk_update_request(struct request *rq, blk_status_t error,
1116 unsigned int nr_bytes);
1118 extern void blk_abort_request(struct request *);
1121 * Access functions for manipulating queue properties
1123 extern void blk_cleanup_queue(struct request_queue *);
1124 extern void blk_queue_bounce_limit(struct request_queue *, u64);
1125 extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
1126 extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
1127 extern void blk_queue_max_segments(struct request_queue *, unsigned short);
1128 extern void blk_queue_max_discard_segments(struct request_queue *,
1130 extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
1131 extern void blk_queue_max_discard_sectors(struct request_queue *q,
1132 unsigned int max_discard_sectors);
1133 extern void blk_queue_max_write_same_sectors(struct request_queue *q,
1134 unsigned int max_write_same_sectors);
1135 extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
1136 unsigned int max_write_same_sectors);
1137 extern void blk_queue_logical_block_size(struct request_queue *, unsigned int);
1138 extern void blk_queue_max_zone_append_sectors(struct request_queue *q,
1139 unsigned int max_zone_append_sectors);
1140 extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
1141 extern void blk_queue_alignment_offset(struct request_queue *q,
1142 unsigned int alignment);
1143 extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
1144 extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
1145 extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
1146 extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
1147 extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
1148 extern void blk_set_default_limits(struct queue_limits *lim);
1149 extern void blk_set_stacking_limits(struct queue_limits *lim);
1150 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
1152 extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
1154 extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
1155 extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
1156 extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
1157 extern void blk_queue_dma_alignment(struct request_queue *, int);
1158 extern void blk_queue_update_dma_alignment(struct request_queue *, int);
1159 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
1160 extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
1161 extern void blk_queue_required_elevator_features(struct request_queue *q,
1162 unsigned int features);
1163 extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q,
1164 struct device *dev);
1167 * Number of physical segments as sent to the device.
1169 * Normally this is the number of discontiguous data segments sent by the
1170 * submitter. But for data-less command like discard we might have no
1171 * actual data segments submitted, but the driver might have to add it's
1172 * own special payload. In that case we still return 1 here so that this
1173 * special payload will be mapped.
1175 static inline unsigned short blk_rq_nr_phys_segments(struct request *rq)
1177 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1179 return rq->nr_phys_segments;
1183 * Number of discard segments (or ranges) the driver needs to fill in.
1184 * Each discard bio merged into a request is counted as one segment.
1186 static inline unsigned short blk_rq_nr_discard_segments(struct request *rq)
1188 return max_t(unsigned short, rq->nr_phys_segments, 1);
1191 int __blk_rq_map_sg(struct request_queue *q, struct request *rq,
1192 struct scatterlist *sglist, struct scatterlist **last_sg);
1193 static inline int blk_rq_map_sg(struct request_queue *q, struct request *rq,
1194 struct scatterlist *sglist)
1196 struct scatterlist *last_sg = NULL;
1198 return __blk_rq_map_sg(q, rq, sglist, &last_sg);
1200 extern void blk_dump_rq_flags(struct request *, char *);
1202 bool __must_check blk_get_queue(struct request_queue *);
1203 struct request_queue *blk_alloc_queue(int node_id);
1204 extern void blk_put_queue(struct request_queue *);
1205 extern void blk_set_queue_dying(struct request_queue *);
1209 * blk_plug permits building a queue of related requests by holding the I/O
1210 * fragments for a short period. This allows merging of sequential requests
1211 * into single larger request. As the requests are moved from a per-task list to
1212 * the device's request_queue in a batch, this results in improved scalability
1213 * as the lock contention for request_queue lock is reduced.
1215 * It is ok not to disable preemption when adding the request to the plug list
1216 * or when attempting a merge, because blk_schedule_flush_list() will only flush
1217 * the plug list when the task sleeps by itself. For details, please see
1218 * schedule() where blk_schedule_flush_plug() is called.
1221 struct list_head mq_list; /* blk-mq requests */
1222 struct list_head cb_list; /* md requires an unplug callback */
1223 unsigned short rq_count;
1224 bool multiple_queues;
1227 #define BLK_MAX_REQUEST_COUNT 16
1228 #define BLK_PLUG_FLUSH_SIZE (128 * 1024)
1231 typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
1232 struct blk_plug_cb {
1233 struct list_head list;
1234 blk_plug_cb_fn callback;
1237 extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
1238 void *data, int size);
1239 extern void blk_start_plug(struct blk_plug *);
1240 extern void blk_finish_plug(struct blk_plug *);
1241 extern void blk_flush_plug_list(struct blk_plug *, bool);
1243 static inline void blk_flush_plug(struct task_struct *tsk)
1245 struct blk_plug *plug = tsk->plug;
1248 blk_flush_plug_list(plug, false);
1251 static inline void blk_schedule_flush_plug(struct task_struct *tsk)
1253 struct blk_plug *plug = tsk->plug;
1256 blk_flush_plug_list(plug, true);
1259 static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1261 struct blk_plug *plug = tsk->plug;
1264 (!list_empty(&plug->mq_list) ||
1265 !list_empty(&plug->cb_list));
1268 int blkdev_issue_flush(struct block_device *, gfp_t);
1269 long nr_blockdev_pages(void);
1270 #else /* CONFIG_BLOCK */
1274 static inline void blk_start_plug(struct blk_plug *plug)
1278 static inline void blk_finish_plug(struct blk_plug *plug)
1282 static inline void blk_flush_plug(struct task_struct *task)
1286 static inline void blk_schedule_flush_plug(struct task_struct *task)
1291 static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1296 static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask)
1301 static inline long nr_blockdev_pages(void)
1305 #endif /* CONFIG_BLOCK */
1307 extern void blk_io_schedule(void);
1309 extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
1310 sector_t nr_sects, gfp_t gfp_mask, struct page *page);
1312 #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */
1314 extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1315 sector_t nr_sects, gfp_t gfp_mask, unsigned long flags);
1316 extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1317 sector_t nr_sects, gfp_t gfp_mask, int flags,
1320 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
1321 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
1323 extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1324 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
1326 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1327 sector_t nr_sects, gfp_t gfp_mask, unsigned flags);
1329 static inline int sb_issue_discard(struct super_block *sb, sector_t block,
1330 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
1332 return blkdev_issue_discard(sb->s_bdev,
1333 block << (sb->s_blocksize_bits -
1335 nr_blocks << (sb->s_blocksize_bits -
1339 static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
1340 sector_t nr_blocks, gfp_t gfp_mask)
1342 return blkdev_issue_zeroout(sb->s_bdev,
1343 block << (sb->s_blocksize_bits -
1345 nr_blocks << (sb->s_blocksize_bits -
1350 extern int blk_verify_command(unsigned char *cmd, fmode_t mode);
1352 enum blk_default_limits {
1353 BLK_MAX_SEGMENTS = 128,
1354 BLK_SAFE_MAX_SECTORS = 255,
1355 BLK_DEF_MAX_SECTORS = 2560,
1356 BLK_MAX_SEGMENT_SIZE = 65536,
1357 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
1360 static inline unsigned long queue_segment_boundary(const struct request_queue *q)
1362 return q->limits.seg_boundary_mask;
1365 static inline unsigned long queue_virt_boundary(const struct request_queue *q)
1367 return q->limits.virt_boundary_mask;
1370 static inline unsigned int queue_max_sectors(const struct request_queue *q)
1372 return q->limits.max_sectors;
1375 static inline unsigned int queue_max_hw_sectors(const struct request_queue *q)
1377 return q->limits.max_hw_sectors;
1380 static inline unsigned short queue_max_segments(const struct request_queue *q)
1382 return q->limits.max_segments;
1385 static inline unsigned short queue_max_discard_segments(const struct request_queue *q)
1387 return q->limits.max_discard_segments;
1390 static inline unsigned int queue_max_segment_size(const struct request_queue *q)
1392 return q->limits.max_segment_size;
1395 static inline unsigned int queue_max_zone_append_sectors(const struct request_queue *q)
1397 return q->limits.max_zone_append_sectors;
1400 static inline unsigned queue_logical_block_size(const struct request_queue *q)
1404 if (q && q->limits.logical_block_size)
1405 retval = q->limits.logical_block_size;
1410 static inline unsigned int bdev_logical_block_size(struct block_device *bdev)
1412 return queue_logical_block_size(bdev_get_queue(bdev));
1415 static inline unsigned int queue_physical_block_size(const struct request_queue *q)
1417 return q->limits.physical_block_size;
1420 static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
1422 return queue_physical_block_size(bdev_get_queue(bdev));
1425 static inline unsigned int queue_io_min(const struct request_queue *q)
1427 return q->limits.io_min;
1430 static inline int bdev_io_min(struct block_device *bdev)
1432 return queue_io_min(bdev_get_queue(bdev));
1435 static inline unsigned int queue_io_opt(const struct request_queue *q)
1437 return q->limits.io_opt;
1440 static inline int bdev_io_opt(struct block_device *bdev)
1442 return queue_io_opt(bdev_get_queue(bdev));
1445 static inline int queue_alignment_offset(const struct request_queue *q)
1447 if (q->limits.misaligned)
1450 return q->limits.alignment_offset;
1453 static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector)
1455 unsigned int granularity = max(lim->physical_block_size, lim->io_min);
1456 unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT)
1459 return (granularity + lim->alignment_offset - alignment) % granularity;
1462 static inline int bdev_alignment_offset(struct block_device *bdev)
1464 struct request_queue *q = bdev_get_queue(bdev);
1466 if (q->limits.misaligned)
1468 if (bdev != bdev->bd_contains)
1469 return queue_limit_alignment_offset(&q->limits,
1470 bdev->bd_part->start_sect);
1471 return q->limits.alignment_offset;
1474 static inline int queue_discard_alignment(const struct request_queue *q)
1476 if (q->limits.discard_misaligned)
1479 return q->limits.discard_alignment;
1482 static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector)
1484 unsigned int alignment, granularity, offset;
1486 if (!lim->max_discard_sectors)
1489 /* Why are these in bytes, not sectors? */
1490 alignment = lim->discard_alignment >> SECTOR_SHIFT;
1491 granularity = lim->discard_granularity >> SECTOR_SHIFT;
1495 /* Offset of the partition start in 'granularity' sectors */
1496 offset = sector_div(sector, granularity);
1498 /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1499 offset = (granularity + alignment - offset) % granularity;
1501 /* Turn it back into bytes, gaah */
1502 return offset << SECTOR_SHIFT;
1505 static inline int bdev_discard_alignment(struct block_device *bdev)
1507 struct request_queue *q = bdev_get_queue(bdev);
1509 if (bdev != bdev->bd_contains)
1510 return queue_limit_discard_alignment(&q->limits,
1511 bdev->bd_part->start_sect);
1512 return q->limits.discard_alignment;
1515 static inline unsigned int bdev_write_same(struct block_device *bdev)
1517 struct request_queue *q = bdev_get_queue(bdev);
1520 return q->limits.max_write_same_sectors;
1525 static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
1527 struct request_queue *q = bdev_get_queue(bdev);
1530 return q->limits.max_write_zeroes_sectors;
1535 static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev)
1537 struct request_queue *q = bdev_get_queue(bdev);
1540 return blk_queue_zoned_model(q);
1542 return BLK_ZONED_NONE;
1545 static inline bool bdev_is_zoned(struct block_device *bdev)
1547 struct request_queue *q = bdev_get_queue(bdev);
1550 return blk_queue_is_zoned(q);
1555 static inline sector_t bdev_zone_sectors(struct block_device *bdev)
1557 struct request_queue *q = bdev_get_queue(bdev);
1560 return blk_queue_zone_sectors(q);
1564 static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
1566 struct request_queue *q = bdev_get_queue(bdev);
1569 return queue_max_open_zones(q);
1573 static inline unsigned int bdev_max_active_zones(struct block_device *bdev)
1575 struct request_queue *q = bdev_get_queue(bdev);
1578 return queue_max_active_zones(q);
1582 static inline int queue_dma_alignment(const struct request_queue *q)
1584 return q ? q->dma_alignment : 511;
1587 static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
1590 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
1591 return !(addr & alignment) && !(len & alignment);
1594 /* assumes size > 256 */
1595 static inline unsigned int blksize_bits(unsigned int size)
1597 unsigned int bits = 8;
1601 } while (size > 256);
1605 static inline unsigned int block_size(struct block_device *bdev)
1607 return 1 << bdev->bd_inode->i_blkbits;
1610 int kblockd_schedule_work(struct work_struct *work);
1611 int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
1613 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1614 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1615 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1616 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1618 #if defined(CONFIG_BLK_DEV_INTEGRITY)
1620 enum blk_integrity_flags {
1621 BLK_INTEGRITY_VERIFY = 1 << 0,
1622 BLK_INTEGRITY_GENERATE = 1 << 1,
1623 BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2,
1624 BLK_INTEGRITY_IP_CHECKSUM = 1 << 3,
1627 struct blk_integrity_iter {
1631 unsigned int data_size;
1632 unsigned short interval;
1633 const char *disk_name;
1636 typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *);
1637 typedef void (integrity_prepare_fn) (struct request *);
1638 typedef void (integrity_complete_fn) (struct request *, unsigned int);
1640 struct blk_integrity_profile {
1641 integrity_processing_fn *generate_fn;
1642 integrity_processing_fn *verify_fn;
1643 integrity_prepare_fn *prepare_fn;
1644 integrity_complete_fn *complete_fn;
1648 extern void blk_integrity_register(struct gendisk *, struct blk_integrity *);
1649 extern void blk_integrity_unregister(struct gendisk *);
1650 extern int blk_integrity_compare(struct gendisk *, struct gendisk *);
1651 extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *,
1652 struct scatterlist *);
1653 extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *);
1654 extern bool blk_integrity_merge_rq(struct request_queue *, struct request *,
1656 extern bool blk_integrity_merge_bio(struct request_queue *, struct request *,
1659 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1661 struct blk_integrity *bi = &disk->queue->integrity;
1670 struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
1672 return blk_get_integrity(bdev->bd_disk);
1676 blk_integrity_queue_supports_integrity(struct request_queue *q)
1678 return q->integrity.profile;
1681 static inline bool blk_integrity_rq(struct request *rq)
1683 return rq->cmd_flags & REQ_INTEGRITY;
1686 static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1689 q->limits.max_integrity_segments = segs;
1692 static inline unsigned short
1693 queue_max_integrity_segments(const struct request_queue *q)
1695 return q->limits.max_integrity_segments;
1699 * bio_integrity_intervals - Return number of integrity intervals for a bio
1700 * @bi: blk_integrity profile for device
1701 * @sectors: Size of the bio in 512-byte sectors
1703 * Description: The block layer calculates everything in 512 byte
1704 * sectors but integrity metadata is done in terms of the data integrity
1705 * interval size of the storage device. Convert the block layer sectors
1706 * to the appropriate number of integrity intervals.
1708 static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
1709 unsigned int sectors)
1711 return sectors >> (bi->interval_exp - 9);
1714 static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
1715 unsigned int sectors)
1717 return bio_integrity_intervals(bi, sectors) * bi->tuple_size;
1721 * Return the first bvec that contains integrity data. Only drivers that are
1722 * limited to a single integrity segment should use this helper.
1724 static inline struct bio_vec *rq_integrity_vec(struct request *rq)
1726 if (WARN_ON_ONCE(queue_max_integrity_segments(rq->q) > 1))
1728 return rq->bio->bi_integrity->bip_vec;
1731 #else /* CONFIG_BLK_DEV_INTEGRITY */
1734 struct block_device;
1736 struct blk_integrity;
1738 static inline int blk_integrity_rq(struct request *rq)
1742 static inline int blk_rq_count_integrity_sg(struct request_queue *q,
1747 static inline int blk_rq_map_integrity_sg(struct request_queue *q,
1749 struct scatterlist *s)
1753 static inline struct blk_integrity *bdev_get_integrity(struct block_device *b)
1757 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1762 blk_integrity_queue_supports_integrity(struct request_queue *q)
1766 static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b)
1770 static inline void blk_integrity_register(struct gendisk *d,
1771 struct blk_integrity *b)
1774 static inline void blk_integrity_unregister(struct gendisk *d)
1777 static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1781 static inline unsigned short queue_max_integrity_segments(const struct request_queue *q)
1785 static inline bool blk_integrity_merge_rq(struct request_queue *rq,
1791 static inline bool blk_integrity_merge_bio(struct request_queue *rq,
1798 static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
1799 unsigned int sectors)
1804 static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
1805 unsigned int sectors)
1810 static inline struct bio_vec *rq_integrity_vec(struct request *rq)
1815 #endif /* CONFIG_BLK_DEV_INTEGRITY */
1817 #ifdef CONFIG_BLK_INLINE_ENCRYPTION
1819 bool blk_ksm_register(struct blk_keyslot_manager *ksm, struct request_queue *q);
1821 void blk_ksm_unregister(struct request_queue *q);
1823 #else /* CONFIG_BLK_INLINE_ENCRYPTION */
1825 static inline bool blk_ksm_register(struct blk_keyslot_manager *ksm,
1826 struct request_queue *q)
1831 static inline void blk_ksm_unregister(struct request_queue *q) { }
1833 #endif /* CONFIG_BLK_INLINE_ENCRYPTION */
1836 struct block_device_operations {
1837 blk_qc_t (*submit_bio) (struct bio *bio);
1838 int (*open) (struct block_device *, fmode_t);
1839 void (*release) (struct gendisk *, fmode_t);
1840 int (*rw_page)(struct block_device *, sector_t, struct page *, unsigned int);
1841 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1842 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1843 unsigned int (*check_events) (struct gendisk *disk,
1844 unsigned int clearing);
1845 void (*unlock_native_capacity) (struct gendisk *);
1846 int (*revalidate_disk) (struct gendisk *);
1847 int (*getgeo)(struct block_device *, struct hd_geometry *);
1848 /* this callback is with swap_lock and sometimes page table lock held */
1849 void (*swap_slot_free_notify) (struct block_device *, unsigned long);
1850 int (*report_zones)(struct gendisk *, sector_t sector,
1851 unsigned int nr_zones, report_zones_cb cb, void *data);
1852 char *(*devnode)(struct gendisk *disk, umode_t *mode);
1853 struct module *owner;
1854 const struct pr_ops *pr_ops;
1857 #ifdef CONFIG_COMPAT
1858 extern int blkdev_compat_ptr_ioctl(struct block_device *, fmode_t,
1859 unsigned int, unsigned long);
1861 #define blkdev_compat_ptr_ioctl NULL
1864 extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int,
1866 extern int bdev_read_page(struct block_device *, sector_t, struct page *);
1867 extern int bdev_write_page(struct block_device *, sector_t, struct page *,
1868 struct writeback_control *);
1870 #ifdef CONFIG_BLK_DEV_ZONED
1871 bool blk_req_needs_zone_write_lock(struct request *rq);
1872 bool blk_req_zone_write_trylock(struct request *rq);
1873 void __blk_req_zone_write_lock(struct request *rq);
1874 void __blk_req_zone_write_unlock(struct request *rq);
1876 static inline void blk_req_zone_write_lock(struct request *rq)
1878 if (blk_req_needs_zone_write_lock(rq))
1879 __blk_req_zone_write_lock(rq);
1882 static inline void blk_req_zone_write_unlock(struct request *rq)
1884 if (rq->rq_flags & RQF_ZONE_WRITE_LOCKED)
1885 __blk_req_zone_write_unlock(rq);
1888 static inline bool blk_req_zone_is_write_locked(struct request *rq)
1890 return rq->q->seq_zones_wlock &&
1891 test_bit(blk_rq_zone_no(rq), rq->q->seq_zones_wlock);
1894 static inline bool blk_req_can_dispatch_to_zone(struct request *rq)
1896 if (!blk_req_needs_zone_write_lock(rq))
1898 return !blk_req_zone_is_write_locked(rq);
1901 static inline bool blk_req_needs_zone_write_lock(struct request *rq)
1906 static inline void blk_req_zone_write_lock(struct request *rq)
1910 static inline void blk_req_zone_write_unlock(struct request *rq)
1913 static inline bool blk_req_zone_is_write_locked(struct request *rq)
1918 static inline bool blk_req_can_dispatch_to_zone(struct request *rq)
1922 #endif /* CONFIG_BLK_DEV_ZONED */
1924 static inline void blk_wake_io_task(struct task_struct *waiter)
1927 * If we're polling, the task itself is doing the completions. For
1928 * that case, we don't need to signal a wakeup, it's enough to just
1929 * mark us as RUNNING.
1931 if (waiter == current)
1932 __set_current_state(TASK_RUNNING);
1934 wake_up_process(waiter);
1937 unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors,
1939 void disk_end_io_acct(struct gendisk *disk, unsigned int op,
1940 unsigned long start_time);
1942 unsigned long part_start_io_acct(struct gendisk *disk, struct hd_struct **part,
1944 void part_end_io_acct(struct hd_struct *part, struct bio *bio,
1945 unsigned long start_time);
1948 * bio_start_io_acct - start I/O accounting for bio based drivers
1949 * @bio: bio to start account for
1951 * Returns the start time that should be passed back to bio_end_io_acct().
1953 static inline unsigned long bio_start_io_acct(struct bio *bio)
1955 return disk_start_io_acct(bio->bi_disk, bio_sectors(bio), bio_op(bio));
1959 * bio_end_io_acct - end I/O accounting for bio based drivers
1960 * @bio: bio to end account for
1961 * @start: start time returned by bio_start_io_acct()
1963 static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time)
1965 return disk_end_io_acct(bio->bi_disk, bio_op(bio), start_time);
1968 int bdev_read_only(struct block_device *bdev);
1969 int set_blocksize(struct block_device *bdev, int size);
1971 const char *bdevname(struct block_device *bdev, char *buffer);
1972 struct block_device *lookup_bdev(const char *);
1974 void blkdev_show(struct seq_file *seqf, off_t offset);
1976 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1977 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
1979 #define BLKDEV_MAJOR_MAX 512
1981 #define BLKDEV_MAJOR_MAX 0
1984 int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder);
1985 struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
1987 struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder);
1988 int bd_prepare_to_claim(struct block_device *bdev, struct block_device *whole,
1990 void bd_abort_claiming(struct block_device *bdev, struct block_device *whole,
1992 void blkdev_put(struct block_device *bdev, fmode_t mode);
1994 struct block_device *I_BDEV(struct inode *inode);
1995 struct block_device *bdget(dev_t);
1996 struct block_device *bdgrab(struct block_device *bdev);
1997 void bdput(struct block_device *);
2000 void invalidate_bdev(struct block_device *bdev);
2001 int truncate_bdev_range(struct block_device *bdev, fmode_t mode, loff_t lstart,
2003 int sync_blockdev(struct block_device *bdev);
2005 static inline void invalidate_bdev(struct block_device *bdev)
2008 static inline int truncate_bdev_range(struct block_device *bdev, fmode_t mode,
2009 loff_t lstart, loff_t lend)
2013 static inline int sync_blockdev(struct block_device *bdev)
2018 int fsync_bdev(struct block_device *bdev);
2020 struct super_block *freeze_bdev(struct block_device *bdev);
2021 int thaw_bdev(struct block_device *bdev, struct super_block *sb);
2023 #endif /* _LINUX_BLKDEV_H */