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 struct list_head icq_list;
489 #ifdef CONFIG_BLK_CGROUP
490 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
491 struct blkcg_gq *root_blkg;
492 struct list_head blkg_list;
495 struct queue_limits limits;
497 unsigned int required_elevator_features;
499 #ifdef CONFIG_BLK_DEV_ZONED
501 * Zoned block device information for request dispatch control.
502 * nr_zones is the total number of zones of the device. This is always
503 * 0 for regular block devices. conv_zones_bitmap is a bitmap of nr_zones
504 * bits which indicates if a zone is conventional (bit set) or
505 * sequential (bit clear). seq_zones_wlock is a bitmap of nr_zones
506 * bits which indicates if a zone is write locked, that is, if a write
507 * request targeting the zone was dispatched. All three fields are
508 * initialized by the low level device driver (e.g. scsi/sd.c).
509 * Stacking drivers (device mappers) may or may not initialize
512 * Reads of this information must be protected with blk_queue_enter() /
513 * blk_queue_exit(). Modifying this information is only allowed while
514 * no requests are being processed. See also blk_mq_freeze_queue() and
515 * blk_mq_unfreeze_queue().
517 unsigned int nr_zones;
518 unsigned long *conv_zones_bitmap;
519 unsigned long *seq_zones_wlock;
520 unsigned int max_open_zones;
521 unsigned int max_active_zones;
522 #endif /* CONFIG_BLK_DEV_ZONED */
527 unsigned int sg_timeout;
528 unsigned int sg_reserved_size;
530 struct mutex debugfs_mutex;
531 #ifdef CONFIG_BLK_DEV_IO_TRACE
532 struct blk_trace __rcu *blk_trace;
535 * for flush operations
537 struct blk_flush_queue *fq;
539 struct list_head requeue_list;
540 spinlock_t requeue_lock;
541 struct delayed_work requeue_work;
543 struct mutex sysfs_lock;
544 struct mutex sysfs_dir_lock;
547 * for reusing dead hctx instance in case of updating
550 struct list_head unused_hctx_list;
551 spinlock_t unused_hctx_lock;
555 #if defined(CONFIG_BLK_DEV_BSG)
556 struct bsg_class_device bsg_dev;
559 #ifdef CONFIG_BLK_DEV_THROTTLING
561 struct throtl_data *td;
563 struct rcu_head rcu_head;
564 wait_queue_head_t mq_freeze_wq;
566 * Protect concurrent access to q_usage_counter by
567 * percpu_ref_kill() and percpu_ref_reinit().
569 struct mutex mq_freeze_lock;
570 struct percpu_ref q_usage_counter;
572 struct blk_mq_tag_set *tag_set;
573 struct list_head tag_set_list;
574 struct bio_set bio_split;
576 struct dentry *debugfs_dir;
578 #ifdef CONFIG_BLK_DEBUG_FS
579 struct dentry *sched_debugfs_dir;
580 struct dentry *rqos_debugfs_dir;
583 bool mq_sysfs_init_done;
587 #define BLK_MAX_WRITE_HINTS 5
588 u64 write_hints[BLK_MAX_WRITE_HINTS];
591 /* Keep blk_queue_flag_name[] in sync with the definitions below */
592 #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */
593 #define QUEUE_FLAG_DYING 1 /* queue being torn down */
594 #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */
595 #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */
596 #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */
597 #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */
598 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
599 #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */
600 #define QUEUE_FLAG_DISCARD 8 /* supports DISCARD */
601 #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */
602 #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */
603 #define QUEUE_FLAG_SECERASE 11 /* supports secure erase */
604 #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */
605 #define QUEUE_FLAG_DEAD 13 /* queue tear-down finished */
606 #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */
607 #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */
608 #define QUEUE_FLAG_WC 17 /* Write back caching */
609 #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */
610 #define QUEUE_FLAG_DAX 19 /* device supports DAX */
611 #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */
612 #define QUEUE_FLAG_POLL_STATS 21 /* collecting stats for hybrid polling */
613 #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */
614 #define QUEUE_FLAG_SCSI_PASSTHROUGH 23 /* queue supports SCSI commands */
615 #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */
616 #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */
617 #define QUEUE_FLAG_ZONE_RESETALL 26 /* supports Zone Reset All */
618 #define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */
620 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
621 (1 << QUEUE_FLAG_SAME_COMP))
623 void blk_queue_flag_set(unsigned int flag, struct request_queue *q);
624 void blk_queue_flag_clear(unsigned int flag, struct request_queue *q);
625 bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
627 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
628 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
629 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
630 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
631 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
632 #define blk_queue_noxmerges(q) \
633 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
634 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
635 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
636 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
637 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
638 #define blk_queue_zone_resetall(q) \
639 test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags)
640 #define blk_queue_secure_erase(q) \
641 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
642 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
643 #define blk_queue_scsi_passthrough(q) \
644 test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags)
645 #define blk_queue_pci_p2pdma(q) \
646 test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags)
647 #ifdef CONFIG_BLK_RQ_ALLOC_TIME
648 #define blk_queue_rq_alloc_time(q) \
649 test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags)
651 #define blk_queue_rq_alloc_time(q) false
654 #define blk_noretry_request(rq) \
655 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
656 REQ_FAILFAST_DRIVER))
657 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
658 #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only)
659 #define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags)
660 #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags)
662 extern void blk_set_pm_only(struct request_queue *q);
663 extern void blk_clear_pm_only(struct request_queue *q);
665 static inline bool blk_account_rq(struct request *rq)
667 return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq);
670 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
672 #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ)
674 #define rq_dma_dir(rq) \
675 (op_is_write(req_op(rq)) ? DMA_TO_DEVICE : DMA_FROM_DEVICE)
677 #define dma_map_bvec(dev, bv, dir, attrs) \
678 dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \
681 static inline bool queue_is_mq(struct request_queue *q)
686 static inline enum blk_zoned_model
687 blk_queue_zoned_model(struct request_queue *q)
689 return q->limits.zoned;
692 static inline bool blk_queue_is_zoned(struct request_queue *q)
694 switch (blk_queue_zoned_model(q)) {
703 static inline sector_t blk_queue_zone_sectors(struct request_queue *q)
705 return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0;
708 #ifdef CONFIG_BLK_DEV_ZONED
709 static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
711 return blk_queue_is_zoned(q) ? q->nr_zones : 0;
714 static inline unsigned int blk_queue_zone_no(struct request_queue *q,
717 if (!blk_queue_is_zoned(q))
719 return sector >> ilog2(q->limits.chunk_sectors);
722 static inline bool blk_queue_zone_is_seq(struct request_queue *q,
725 if (!blk_queue_is_zoned(q))
727 if (!q->conv_zones_bitmap)
729 return !test_bit(blk_queue_zone_no(q, sector), q->conv_zones_bitmap);
732 static inline void blk_queue_max_open_zones(struct request_queue *q,
733 unsigned int max_open_zones)
735 q->max_open_zones = max_open_zones;
738 static inline unsigned int queue_max_open_zones(const struct request_queue *q)
740 return q->max_open_zones;
743 static inline void blk_queue_max_active_zones(struct request_queue *q,
744 unsigned int max_active_zones)
746 q->max_active_zones = max_active_zones;
749 static inline unsigned int queue_max_active_zones(const struct request_queue *q)
751 return q->max_active_zones;
753 #else /* CONFIG_BLK_DEV_ZONED */
754 static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
758 static inline bool blk_queue_zone_is_seq(struct request_queue *q,
763 static inline unsigned int blk_queue_zone_no(struct request_queue *q,
768 static inline unsigned int queue_max_open_zones(const struct request_queue *q)
772 static inline unsigned int queue_max_active_zones(const struct request_queue *q)
776 #endif /* CONFIG_BLK_DEV_ZONED */
778 static inline bool rq_is_sync(struct request *rq)
780 return op_is_sync(rq->cmd_flags);
783 static inline bool rq_mergeable(struct request *rq)
785 if (blk_rq_is_passthrough(rq))
788 if (req_op(rq) == REQ_OP_FLUSH)
791 if (req_op(rq) == REQ_OP_WRITE_ZEROES)
794 if (req_op(rq) == REQ_OP_ZONE_APPEND)
797 if (rq->cmd_flags & REQ_NOMERGE_FLAGS)
799 if (rq->rq_flags & RQF_NOMERGE_FLAGS)
805 static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b)
807 if (bio_page(a) == bio_page(b) &&
808 bio_offset(a) == bio_offset(b))
814 static inline unsigned int blk_queue_depth(struct request_queue *q)
817 return q->queue_depth;
819 return q->nr_requests;
822 extern unsigned long blk_max_low_pfn, blk_max_pfn;
825 * standard bounce addresses:
827 * BLK_BOUNCE_HIGH : bounce all highmem pages
828 * BLK_BOUNCE_ANY : don't bounce anything
829 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
832 #if BITS_PER_LONG == 32
833 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
835 #define BLK_BOUNCE_HIGH -1ULL
837 #define BLK_BOUNCE_ANY (-1ULL)
838 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
841 * default timeout for SG_IO if none specified
843 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
844 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
850 unsigned long offset;
855 struct req_iterator {
856 struct bvec_iter iter;
860 /* This should not be used directly - use rq_for_each_segment */
861 #define for_each_bio(_bio) \
862 for (; _bio; _bio = _bio->bi_next)
863 #define __rq_for_each_bio(_bio, rq) \
865 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
867 #define rq_for_each_segment(bvl, _rq, _iter) \
868 __rq_for_each_bio(_iter.bio, _rq) \
869 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
871 #define rq_for_each_bvec(bvl, _rq, _iter) \
872 __rq_for_each_bio(_iter.bio, _rq) \
873 bio_for_each_bvec(bvl, _iter.bio, _iter.iter)
875 #define rq_iter_last(bvec, _iter) \
876 (_iter.bio->bi_next == NULL && \
877 bio_iter_last(bvec, _iter.iter))
879 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
880 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
882 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
883 extern void rq_flush_dcache_pages(struct request *rq);
885 static inline void rq_flush_dcache_pages(struct request *rq)
890 extern int blk_register_queue(struct gendisk *disk);
891 extern void blk_unregister_queue(struct gendisk *disk);
892 blk_qc_t submit_bio_noacct(struct bio *bio);
893 extern void blk_rq_init(struct request_queue *q, struct request *rq);
894 extern void blk_put_request(struct request *);
895 extern struct request *blk_get_request(struct request_queue *, unsigned int op,
896 blk_mq_req_flags_t flags);
897 extern int blk_lld_busy(struct request_queue *q);
898 extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
899 struct bio_set *bs, gfp_t gfp_mask,
900 int (*bio_ctr)(struct bio *, struct bio *, void *),
902 extern void blk_rq_unprep_clone(struct request *rq);
903 extern blk_status_t blk_insert_cloned_request(struct request_queue *q,
905 extern int blk_rq_append_bio(struct request *rq, struct bio **bio);
906 extern void blk_queue_split(struct bio **);
907 extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int);
908 extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t,
909 unsigned int, void __user *);
910 extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
911 unsigned int, void __user *);
912 extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
913 struct scsi_ioctl_command __user *);
914 extern int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp);
915 extern int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp);
917 extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags);
918 extern void blk_queue_exit(struct request_queue *q);
919 extern void blk_sync_queue(struct request_queue *q);
920 extern int blk_rq_map_user(struct request_queue *, struct request *,
921 struct rq_map_data *, void __user *, unsigned long,
923 extern int blk_rq_unmap_user(struct bio *);
924 extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t);
925 extern int blk_rq_map_user_iov(struct request_queue *, struct request *,
926 struct rq_map_data *, const struct iov_iter *,
928 extern void blk_execute_rq(struct request_queue *, struct gendisk *,
929 struct request *, int);
930 extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
931 struct request *, int, rq_end_io_fn *);
933 /* Helper to convert REQ_OP_XXX to its string format XXX */
934 extern const char *blk_op_str(unsigned int op);
936 int blk_status_to_errno(blk_status_t status);
937 blk_status_t errno_to_blk_status(int errno);
939 int blk_poll(struct request_queue *q, blk_qc_t cookie, bool spin);
941 static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
943 return bdev->bd_disk->queue; /* this is never NULL */
947 * The basic unit of block I/O is a sector. It is used in a number of contexts
948 * in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9
949 * bytes. Variables of type sector_t represent an offset or size that is a
950 * multiple of 512 bytes. Hence these two constants.
953 #define SECTOR_SHIFT 9
956 #define SECTOR_SIZE (1 << SECTOR_SHIFT)
960 * blk_rq_pos() : the current sector
961 * blk_rq_bytes() : bytes left in the entire request
962 * blk_rq_cur_bytes() : bytes left in the current segment
963 * blk_rq_err_bytes() : bytes left till the next error boundary
964 * blk_rq_sectors() : sectors left in the entire request
965 * blk_rq_cur_sectors() : sectors left in the current segment
966 * blk_rq_stats_sectors() : sectors of the entire request used for stats
968 static inline sector_t blk_rq_pos(const struct request *rq)
973 static inline unsigned int blk_rq_bytes(const struct request *rq)
975 return rq->__data_len;
978 static inline int blk_rq_cur_bytes(const struct request *rq)
980 return rq->bio ? bio_cur_bytes(rq->bio) : 0;
983 extern unsigned int blk_rq_err_bytes(const struct request *rq);
985 static inline unsigned int blk_rq_sectors(const struct request *rq)
987 return blk_rq_bytes(rq) >> SECTOR_SHIFT;
990 static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
992 return blk_rq_cur_bytes(rq) >> SECTOR_SHIFT;
995 static inline unsigned int blk_rq_stats_sectors(const struct request *rq)
997 return rq->stats_sectors;
1000 #ifdef CONFIG_BLK_DEV_ZONED
1002 /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */
1003 const char *blk_zone_cond_str(enum blk_zone_cond zone_cond);
1005 static inline unsigned int blk_rq_zone_no(struct request *rq)
1007 return blk_queue_zone_no(rq->q, blk_rq_pos(rq));
1010 static inline unsigned int blk_rq_zone_is_seq(struct request *rq)
1012 return blk_queue_zone_is_seq(rq->q, blk_rq_pos(rq));
1014 #endif /* CONFIG_BLK_DEV_ZONED */
1017 * Some commands like WRITE SAME have a payload or data transfer size which
1018 * is different from the size of the request. Any driver that supports such
1019 * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to
1020 * calculate the data transfer size.
1022 static inline unsigned int blk_rq_payload_bytes(struct request *rq)
1024 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1025 return rq->special_vec.bv_len;
1026 return blk_rq_bytes(rq);
1030 * Return the first full biovec in the request. The caller needs to check that
1031 * there are any bvecs before calling this helper.
1033 static inline struct bio_vec req_bvec(struct request *rq)
1035 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1036 return rq->special_vec;
1037 return mp_bvec_iter_bvec(rq->bio->bi_io_vec, rq->bio->bi_iter);
1040 static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
1043 if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE))
1044 return min(q->limits.max_discard_sectors,
1045 UINT_MAX >> SECTOR_SHIFT);
1047 if (unlikely(op == REQ_OP_WRITE_SAME))
1048 return q->limits.max_write_same_sectors;
1050 if (unlikely(op == REQ_OP_WRITE_ZEROES))
1051 return q->limits.max_write_zeroes_sectors;
1053 return q->limits.max_sectors;
1057 * Return maximum size of a request at given offset. Only valid for
1058 * file system requests.
1060 static inline unsigned int blk_max_size_offset(struct request_queue *q,
1063 if (!q->limits.chunk_sectors)
1064 return q->limits.max_sectors;
1066 return min(q->limits.max_sectors, (unsigned int)(q->limits.chunk_sectors -
1067 (offset & (q->limits.chunk_sectors - 1))));
1070 static inline unsigned int blk_rq_get_max_sectors(struct request *rq,
1073 struct request_queue *q = rq->q;
1075 if (blk_rq_is_passthrough(rq))
1076 return q->limits.max_hw_sectors;
1078 if (!q->limits.chunk_sectors ||
1079 req_op(rq) == REQ_OP_DISCARD ||
1080 req_op(rq) == REQ_OP_SECURE_ERASE)
1081 return blk_queue_get_max_sectors(q, req_op(rq));
1083 return min(blk_max_size_offset(q, offset),
1084 blk_queue_get_max_sectors(q, req_op(rq)));
1087 static inline unsigned int blk_rq_count_bios(struct request *rq)
1089 unsigned int nr_bios = 0;
1092 __rq_for_each_bio(bio, rq)
1098 void blk_steal_bios(struct bio_list *list, struct request *rq);
1101 * Request completion related functions.
1103 * blk_update_request() completes given number of bytes and updates
1104 * the request without completing it.
1106 extern bool blk_update_request(struct request *rq, blk_status_t error,
1107 unsigned int nr_bytes);
1109 extern void blk_abort_request(struct request *);
1112 * Access functions for manipulating queue properties
1114 extern void blk_cleanup_queue(struct request_queue *);
1115 extern void blk_queue_bounce_limit(struct request_queue *, u64);
1116 extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
1117 extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
1118 extern void blk_queue_max_segments(struct request_queue *, unsigned short);
1119 extern void blk_queue_max_discard_segments(struct request_queue *,
1121 extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
1122 extern void blk_queue_max_discard_sectors(struct request_queue *q,
1123 unsigned int max_discard_sectors);
1124 extern void blk_queue_max_write_same_sectors(struct request_queue *q,
1125 unsigned int max_write_same_sectors);
1126 extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
1127 unsigned int max_write_same_sectors);
1128 extern void blk_queue_logical_block_size(struct request_queue *, unsigned int);
1129 extern void blk_queue_max_zone_append_sectors(struct request_queue *q,
1130 unsigned int max_zone_append_sectors);
1131 extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
1132 extern void blk_queue_alignment_offset(struct request_queue *q,
1133 unsigned int alignment);
1134 extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
1135 extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
1136 extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
1137 extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
1138 extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
1139 extern void blk_set_default_limits(struct queue_limits *lim);
1140 extern void blk_set_stacking_limits(struct queue_limits *lim);
1141 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
1143 extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
1145 extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
1146 extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
1147 extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
1148 extern void blk_queue_dma_alignment(struct request_queue *, int);
1149 extern void blk_queue_update_dma_alignment(struct request_queue *, int);
1150 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
1151 extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
1152 extern void blk_queue_required_elevator_features(struct request_queue *q,
1153 unsigned int features);
1154 extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q,
1155 struct device *dev);
1158 * Number of physical segments as sent to the device.
1160 * Normally this is the number of discontiguous data segments sent by the
1161 * submitter. But for data-less command like discard we might have no
1162 * actual data segments submitted, but the driver might have to add it's
1163 * own special payload. In that case we still return 1 here so that this
1164 * special payload will be mapped.
1166 static inline unsigned short blk_rq_nr_phys_segments(struct request *rq)
1168 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1170 return rq->nr_phys_segments;
1174 * Number of discard segments (or ranges) the driver needs to fill in.
1175 * Each discard bio merged into a request is counted as one segment.
1177 static inline unsigned short blk_rq_nr_discard_segments(struct request *rq)
1179 return max_t(unsigned short, rq->nr_phys_segments, 1);
1182 int __blk_rq_map_sg(struct request_queue *q, struct request *rq,
1183 struct scatterlist *sglist, struct scatterlist **last_sg);
1184 static inline int blk_rq_map_sg(struct request_queue *q, struct request *rq,
1185 struct scatterlist *sglist)
1187 struct scatterlist *last_sg = NULL;
1189 return __blk_rq_map_sg(q, rq, sglist, &last_sg);
1191 extern void blk_dump_rq_flags(struct request *, char *);
1193 bool __must_check blk_get_queue(struct request_queue *);
1194 struct request_queue *blk_alloc_queue(int node_id);
1195 extern void blk_put_queue(struct request_queue *);
1196 extern void blk_set_queue_dying(struct request_queue *);
1200 * blk_plug permits building a queue of related requests by holding the I/O
1201 * fragments for a short period. This allows merging of sequential requests
1202 * into single larger request. As the requests are moved from a per-task list to
1203 * the device's request_queue in a batch, this results in improved scalability
1204 * as the lock contention for request_queue lock is reduced.
1206 * It is ok not to disable preemption when adding the request to the plug list
1207 * or when attempting a merge, because blk_schedule_flush_list() will only flush
1208 * the plug list when the task sleeps by itself. For details, please see
1209 * schedule() where blk_schedule_flush_plug() is called.
1212 struct list_head mq_list; /* blk-mq requests */
1213 struct list_head cb_list; /* md requires an unplug callback */
1214 unsigned short rq_count;
1215 bool multiple_queues;
1218 #define BLK_MAX_REQUEST_COUNT 16
1219 #define BLK_PLUG_FLUSH_SIZE (128 * 1024)
1222 typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
1223 struct blk_plug_cb {
1224 struct list_head list;
1225 blk_plug_cb_fn callback;
1228 extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
1229 void *data, int size);
1230 extern void blk_start_plug(struct blk_plug *);
1231 extern void blk_finish_plug(struct blk_plug *);
1232 extern void blk_flush_plug_list(struct blk_plug *, bool);
1234 static inline void blk_flush_plug(struct task_struct *tsk)
1236 struct blk_plug *plug = tsk->plug;
1239 blk_flush_plug_list(plug, false);
1242 static inline void blk_schedule_flush_plug(struct task_struct *tsk)
1244 struct blk_plug *plug = tsk->plug;
1247 blk_flush_plug_list(plug, true);
1250 static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1252 struct blk_plug *plug = tsk->plug;
1255 (!list_empty(&plug->mq_list) ||
1256 !list_empty(&plug->cb_list));
1259 int blkdev_issue_flush(struct block_device *, gfp_t);
1260 long nr_blockdev_pages(void);
1261 #else /* CONFIG_BLOCK */
1265 static inline void blk_start_plug(struct blk_plug *plug)
1269 static inline void blk_finish_plug(struct blk_plug *plug)
1273 static inline void blk_flush_plug(struct task_struct *task)
1277 static inline void blk_schedule_flush_plug(struct task_struct *task)
1282 static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1287 static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask)
1292 static inline long nr_blockdev_pages(void)
1296 #endif /* CONFIG_BLOCK */
1298 extern void blk_io_schedule(void);
1300 extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
1301 sector_t nr_sects, gfp_t gfp_mask, struct page *page);
1303 #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */
1305 extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1306 sector_t nr_sects, gfp_t gfp_mask, unsigned long flags);
1307 extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1308 sector_t nr_sects, gfp_t gfp_mask, int flags,
1311 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
1312 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
1314 extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1315 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
1317 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1318 sector_t nr_sects, gfp_t gfp_mask, unsigned flags);
1320 static inline int sb_issue_discard(struct super_block *sb, sector_t block,
1321 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
1323 return blkdev_issue_discard(sb->s_bdev,
1324 block << (sb->s_blocksize_bits -
1326 nr_blocks << (sb->s_blocksize_bits -
1330 static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
1331 sector_t nr_blocks, gfp_t gfp_mask)
1333 return blkdev_issue_zeroout(sb->s_bdev,
1334 block << (sb->s_blocksize_bits -
1336 nr_blocks << (sb->s_blocksize_bits -
1341 extern int blk_verify_command(unsigned char *cmd, fmode_t mode);
1343 enum blk_default_limits {
1344 BLK_MAX_SEGMENTS = 128,
1345 BLK_SAFE_MAX_SECTORS = 255,
1346 BLK_DEF_MAX_SECTORS = 2560,
1347 BLK_MAX_SEGMENT_SIZE = 65536,
1348 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
1351 static inline unsigned long queue_segment_boundary(const struct request_queue *q)
1353 return q->limits.seg_boundary_mask;
1356 static inline unsigned long queue_virt_boundary(const struct request_queue *q)
1358 return q->limits.virt_boundary_mask;
1361 static inline unsigned int queue_max_sectors(const struct request_queue *q)
1363 return q->limits.max_sectors;
1366 static inline unsigned int queue_max_hw_sectors(const struct request_queue *q)
1368 return q->limits.max_hw_sectors;
1371 static inline unsigned short queue_max_segments(const struct request_queue *q)
1373 return q->limits.max_segments;
1376 static inline unsigned short queue_max_discard_segments(const struct request_queue *q)
1378 return q->limits.max_discard_segments;
1381 static inline unsigned int queue_max_segment_size(const struct request_queue *q)
1383 return q->limits.max_segment_size;
1386 static inline unsigned int queue_max_zone_append_sectors(const struct request_queue *q)
1388 return q->limits.max_zone_append_sectors;
1391 static inline unsigned queue_logical_block_size(const struct request_queue *q)
1395 if (q && q->limits.logical_block_size)
1396 retval = q->limits.logical_block_size;
1401 static inline unsigned int bdev_logical_block_size(struct block_device *bdev)
1403 return queue_logical_block_size(bdev_get_queue(bdev));
1406 static inline unsigned int queue_physical_block_size(const struct request_queue *q)
1408 return q->limits.physical_block_size;
1411 static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
1413 return queue_physical_block_size(bdev_get_queue(bdev));
1416 static inline unsigned int queue_io_min(const struct request_queue *q)
1418 return q->limits.io_min;
1421 static inline int bdev_io_min(struct block_device *bdev)
1423 return queue_io_min(bdev_get_queue(bdev));
1426 static inline unsigned int queue_io_opt(const struct request_queue *q)
1428 return q->limits.io_opt;
1431 static inline int bdev_io_opt(struct block_device *bdev)
1433 return queue_io_opt(bdev_get_queue(bdev));
1436 static inline int queue_alignment_offset(const struct request_queue *q)
1438 if (q->limits.misaligned)
1441 return q->limits.alignment_offset;
1444 static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector)
1446 unsigned int granularity = max(lim->physical_block_size, lim->io_min);
1447 unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT)
1450 return (granularity + lim->alignment_offset - alignment) % granularity;
1453 static inline int bdev_alignment_offset(struct block_device *bdev)
1455 struct request_queue *q = bdev_get_queue(bdev);
1457 if (q->limits.misaligned)
1460 if (bdev != bdev->bd_contains)
1461 return bdev->bd_part->alignment_offset;
1463 return q->limits.alignment_offset;
1466 static inline int queue_discard_alignment(const struct request_queue *q)
1468 if (q->limits.discard_misaligned)
1471 return q->limits.discard_alignment;
1474 static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector)
1476 unsigned int alignment, granularity, offset;
1478 if (!lim->max_discard_sectors)
1481 /* Why are these in bytes, not sectors? */
1482 alignment = lim->discard_alignment >> SECTOR_SHIFT;
1483 granularity = lim->discard_granularity >> SECTOR_SHIFT;
1487 /* Offset of the partition start in 'granularity' sectors */
1488 offset = sector_div(sector, granularity);
1490 /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1491 offset = (granularity + alignment - offset) % granularity;
1493 /* Turn it back into bytes, gaah */
1494 return offset << SECTOR_SHIFT;
1497 static inline int bdev_discard_alignment(struct block_device *bdev)
1499 struct request_queue *q = bdev_get_queue(bdev);
1501 if (bdev != bdev->bd_contains)
1502 return bdev->bd_part->discard_alignment;
1504 return q->limits.discard_alignment;
1507 static inline unsigned int bdev_write_same(struct block_device *bdev)
1509 struct request_queue *q = bdev_get_queue(bdev);
1512 return q->limits.max_write_same_sectors;
1517 static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
1519 struct request_queue *q = bdev_get_queue(bdev);
1522 return q->limits.max_write_zeroes_sectors;
1527 static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev)
1529 struct request_queue *q = bdev_get_queue(bdev);
1532 return blk_queue_zoned_model(q);
1534 return BLK_ZONED_NONE;
1537 static inline bool bdev_is_zoned(struct block_device *bdev)
1539 struct request_queue *q = bdev_get_queue(bdev);
1542 return blk_queue_is_zoned(q);
1547 static inline sector_t bdev_zone_sectors(struct block_device *bdev)
1549 struct request_queue *q = bdev_get_queue(bdev);
1552 return blk_queue_zone_sectors(q);
1556 static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
1558 struct request_queue *q = bdev_get_queue(bdev);
1561 return queue_max_open_zones(q);
1565 static inline unsigned int bdev_max_active_zones(struct block_device *bdev)
1567 struct request_queue *q = bdev_get_queue(bdev);
1570 return queue_max_active_zones(q);
1574 static inline int queue_dma_alignment(const struct request_queue *q)
1576 return q ? q->dma_alignment : 511;
1579 static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
1582 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
1583 return !(addr & alignment) && !(len & alignment);
1586 /* assumes size > 256 */
1587 static inline unsigned int blksize_bits(unsigned int size)
1589 unsigned int bits = 8;
1593 } while (size > 256);
1597 static inline unsigned int block_size(struct block_device *bdev)
1599 return 1 << bdev->bd_inode->i_blkbits;
1602 int kblockd_schedule_work(struct work_struct *work);
1603 int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
1605 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1606 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1607 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1608 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1610 #if defined(CONFIG_BLK_DEV_INTEGRITY)
1612 enum blk_integrity_flags {
1613 BLK_INTEGRITY_VERIFY = 1 << 0,
1614 BLK_INTEGRITY_GENERATE = 1 << 1,
1615 BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2,
1616 BLK_INTEGRITY_IP_CHECKSUM = 1 << 3,
1619 struct blk_integrity_iter {
1623 unsigned int data_size;
1624 unsigned short interval;
1625 const char *disk_name;
1628 typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *);
1629 typedef void (integrity_prepare_fn) (struct request *);
1630 typedef void (integrity_complete_fn) (struct request *, unsigned int);
1632 struct blk_integrity_profile {
1633 integrity_processing_fn *generate_fn;
1634 integrity_processing_fn *verify_fn;
1635 integrity_prepare_fn *prepare_fn;
1636 integrity_complete_fn *complete_fn;
1640 extern void blk_integrity_register(struct gendisk *, struct blk_integrity *);
1641 extern void blk_integrity_unregister(struct gendisk *);
1642 extern int blk_integrity_compare(struct gendisk *, struct gendisk *);
1643 extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *,
1644 struct scatterlist *);
1645 extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *);
1646 extern bool blk_integrity_merge_rq(struct request_queue *, struct request *,
1648 extern bool blk_integrity_merge_bio(struct request_queue *, struct request *,
1651 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1653 struct blk_integrity *bi = &disk->queue->integrity;
1662 struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
1664 return blk_get_integrity(bdev->bd_disk);
1668 blk_integrity_queue_supports_integrity(struct request_queue *q)
1670 return q->integrity.profile;
1673 static inline bool blk_integrity_rq(struct request *rq)
1675 return rq->cmd_flags & REQ_INTEGRITY;
1678 static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1681 q->limits.max_integrity_segments = segs;
1684 static inline unsigned short
1685 queue_max_integrity_segments(const struct request_queue *q)
1687 return q->limits.max_integrity_segments;
1691 * bio_integrity_intervals - Return number of integrity intervals for a bio
1692 * @bi: blk_integrity profile for device
1693 * @sectors: Size of the bio in 512-byte sectors
1695 * Description: The block layer calculates everything in 512 byte
1696 * sectors but integrity metadata is done in terms of the data integrity
1697 * interval size of the storage device. Convert the block layer sectors
1698 * to the appropriate number of integrity intervals.
1700 static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
1701 unsigned int sectors)
1703 return sectors >> (bi->interval_exp - 9);
1706 static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
1707 unsigned int sectors)
1709 return bio_integrity_intervals(bi, sectors) * bi->tuple_size;
1713 * Return the first bvec that contains integrity data. Only drivers that are
1714 * limited to a single integrity segment should use this helper.
1716 static inline struct bio_vec *rq_integrity_vec(struct request *rq)
1718 if (WARN_ON_ONCE(queue_max_integrity_segments(rq->q) > 1))
1720 return rq->bio->bi_integrity->bip_vec;
1723 #else /* CONFIG_BLK_DEV_INTEGRITY */
1726 struct block_device;
1728 struct blk_integrity;
1730 static inline int blk_integrity_rq(struct request *rq)
1734 static inline int blk_rq_count_integrity_sg(struct request_queue *q,
1739 static inline int blk_rq_map_integrity_sg(struct request_queue *q,
1741 struct scatterlist *s)
1745 static inline struct blk_integrity *bdev_get_integrity(struct block_device *b)
1749 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1754 blk_integrity_queue_supports_integrity(struct request_queue *q)
1758 static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b)
1762 static inline void blk_integrity_register(struct gendisk *d,
1763 struct blk_integrity *b)
1766 static inline void blk_integrity_unregister(struct gendisk *d)
1769 static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1773 static inline unsigned short queue_max_integrity_segments(const struct request_queue *q)
1777 static inline bool blk_integrity_merge_rq(struct request_queue *rq,
1783 static inline bool blk_integrity_merge_bio(struct request_queue *rq,
1790 static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
1791 unsigned int sectors)
1796 static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
1797 unsigned int sectors)
1802 static inline struct bio_vec *rq_integrity_vec(struct request *rq)
1807 #endif /* CONFIG_BLK_DEV_INTEGRITY */
1809 #ifdef CONFIG_BLK_INLINE_ENCRYPTION
1811 bool blk_ksm_register(struct blk_keyslot_manager *ksm, struct request_queue *q);
1813 void blk_ksm_unregister(struct request_queue *q);
1815 #else /* CONFIG_BLK_INLINE_ENCRYPTION */
1817 static inline bool blk_ksm_register(struct blk_keyslot_manager *ksm,
1818 struct request_queue *q)
1823 static inline void blk_ksm_unregister(struct request_queue *q) { }
1825 #endif /* CONFIG_BLK_INLINE_ENCRYPTION */
1828 struct block_device_operations {
1829 blk_qc_t (*submit_bio) (struct bio *bio);
1830 int (*open) (struct block_device *, fmode_t);
1831 void (*release) (struct gendisk *, fmode_t);
1832 int (*rw_page)(struct block_device *, sector_t, struct page *, unsigned int);
1833 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1834 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1835 unsigned int (*check_events) (struct gendisk *disk,
1836 unsigned int clearing);
1837 void (*unlock_native_capacity) (struct gendisk *);
1838 int (*revalidate_disk) (struct gendisk *);
1839 int (*getgeo)(struct block_device *, struct hd_geometry *);
1840 /* this callback is with swap_lock and sometimes page table lock held */
1841 void (*swap_slot_free_notify) (struct block_device *, unsigned long);
1842 int (*report_zones)(struct gendisk *, sector_t sector,
1843 unsigned int nr_zones, report_zones_cb cb, void *data);
1844 char *(*devnode)(struct gendisk *disk, umode_t *mode);
1845 struct module *owner;
1846 const struct pr_ops *pr_ops;
1849 #ifdef CONFIG_COMPAT
1850 extern int blkdev_compat_ptr_ioctl(struct block_device *, fmode_t,
1851 unsigned int, unsigned long);
1853 #define blkdev_compat_ptr_ioctl NULL
1856 extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int,
1858 extern int bdev_read_page(struct block_device *, sector_t, struct page *);
1859 extern int bdev_write_page(struct block_device *, sector_t, struct page *,
1860 struct writeback_control *);
1862 #ifdef CONFIG_BLK_DEV_ZONED
1863 bool blk_req_needs_zone_write_lock(struct request *rq);
1864 bool blk_req_zone_write_trylock(struct request *rq);
1865 void __blk_req_zone_write_lock(struct request *rq);
1866 void __blk_req_zone_write_unlock(struct request *rq);
1868 static inline void blk_req_zone_write_lock(struct request *rq)
1870 if (blk_req_needs_zone_write_lock(rq))
1871 __blk_req_zone_write_lock(rq);
1874 static inline void blk_req_zone_write_unlock(struct request *rq)
1876 if (rq->rq_flags & RQF_ZONE_WRITE_LOCKED)
1877 __blk_req_zone_write_unlock(rq);
1880 static inline bool blk_req_zone_is_write_locked(struct request *rq)
1882 return rq->q->seq_zones_wlock &&
1883 test_bit(blk_rq_zone_no(rq), rq->q->seq_zones_wlock);
1886 static inline bool blk_req_can_dispatch_to_zone(struct request *rq)
1888 if (!blk_req_needs_zone_write_lock(rq))
1890 return !blk_req_zone_is_write_locked(rq);
1893 static inline bool blk_req_needs_zone_write_lock(struct request *rq)
1898 static inline void blk_req_zone_write_lock(struct request *rq)
1902 static inline void blk_req_zone_write_unlock(struct request *rq)
1905 static inline bool blk_req_zone_is_write_locked(struct request *rq)
1910 static inline bool blk_req_can_dispatch_to_zone(struct request *rq)
1914 #endif /* CONFIG_BLK_DEV_ZONED */
1916 static inline void blk_wake_io_task(struct task_struct *waiter)
1919 * If we're polling, the task itself is doing the completions. For
1920 * that case, we don't need to signal a wakeup, it's enough to just
1921 * mark us as RUNNING.
1923 if (waiter == current)
1924 __set_current_state(TASK_RUNNING);
1926 wake_up_process(waiter);
1929 unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors,
1931 void disk_end_io_acct(struct gendisk *disk, unsigned int op,
1932 unsigned long start_time);
1935 * bio_start_io_acct - start I/O accounting for bio based drivers
1936 * @bio: bio to start account for
1938 * Returns the start time that should be passed back to bio_end_io_acct().
1940 static inline unsigned long bio_start_io_acct(struct bio *bio)
1942 return disk_start_io_acct(bio->bi_disk, bio_sectors(bio), bio_op(bio));
1946 * bio_end_io_acct - end I/O accounting for bio based drivers
1947 * @bio: bio to end account for
1948 * @start: start time returned by bio_start_io_acct()
1950 static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time)
1952 return disk_end_io_acct(bio->bi_disk, bio_op(bio), start_time);
1955 int bdev_read_only(struct block_device *bdev);
1956 int set_blocksize(struct block_device *bdev, int size);
1958 const char *bdevname(struct block_device *bdev, char *buffer);
1959 struct block_device *lookup_bdev(const char *);
1961 void blkdev_show(struct seq_file *seqf, off_t offset);
1963 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1964 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
1966 #define BLKDEV_MAJOR_MAX 512
1968 #define BLKDEV_MAJOR_MAX 0
1971 int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder);
1972 struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
1974 struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder);
1975 int bd_prepare_to_claim(struct block_device *bdev, struct block_device *whole,
1977 void bd_abort_claiming(struct block_device *bdev, struct block_device *whole,
1979 void blkdev_put(struct block_device *bdev, fmode_t mode);
1981 struct block_device *I_BDEV(struct inode *inode);
1982 struct block_device *bdget(dev_t);
1983 struct block_device *bdgrab(struct block_device *bdev);
1984 void bdput(struct block_device *);
1987 void invalidate_bdev(struct block_device *bdev);
1988 int sync_blockdev(struct block_device *bdev);
1990 static inline void invalidate_bdev(struct block_device *bdev)
1993 static inline int sync_blockdev(struct block_device *bdev)
1998 int fsync_bdev(struct block_device *bdev);
2000 struct super_block *freeze_bdev(struct block_device *bdev);
2001 int thaw_bdev(struct block_device *bdev, struct super_block *sb);
2003 #endif /* _LINUX_BLKDEV_H */