1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Portions Copyright (C) 1992 Drew Eckhardt
5 #ifndef _LINUX_BLKDEV_H
6 #define _LINUX_BLKDEV_H
8 #include <linux/types.h>
9 #include <linux/blk_types.h>
10 #include <linux/device.h>
11 #include <linux/list.h>
12 #include <linux/llist.h>
13 #include <linux/minmax.h>
14 #include <linux/timer.h>
15 #include <linux/workqueue.h>
16 #include <linux/wait.h>
17 #include <linux/bio.h>
18 #include <linux/gfp.h>
19 #include <linux/kdev_t.h>
20 #include <linux/rcupdate.h>
21 #include <linux/percpu-refcount.h>
22 #include <linux/blkzoned.h>
23 #include <linux/sched.h>
24 #include <linux/sbitmap.h>
25 #include <linux/uuid.h>
26 #include <linux/xarray.h>
27 #include <linux/file.h>
31 struct elevator_queue;
36 struct blk_flush_queue;
40 struct blk_queue_stats;
41 struct blk_stat_callback;
42 struct blk_crypto_profile;
44 extern const struct device_type disk_type;
45 extern const struct device_type part_type;
46 extern const struct class block_class;
49 * Maximum number of blkcg policies allowed to be registered concurrently.
50 * Defined here to simplify include dependency.
52 #define BLKCG_MAX_POLS 6
54 #define DISK_MAX_PARTS 256
55 #define DISK_NAME_LEN 32
57 #define PARTITION_META_INFO_VOLNAMELTH 64
59 * Enough for the string representation of any kind of UUID plus NULL.
60 * EFI UUID is 36 characters. MSDOS UUID is 11 characters.
62 #define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1)
64 struct partition_meta_info {
65 char uuid[PARTITION_META_INFO_UUIDLTH];
66 u8 volname[PARTITION_META_INFO_VOLNAMELTH];
70 * DOC: genhd capability flags
72 * ``GENHD_FL_REMOVABLE``: indicates that the block device gives access to
73 * removable media. When set, the device remains present even when media is not
74 * inserted. Shall not be set for devices which are removed entirely when the
77 * ``GENHD_FL_HIDDEN``: the block device is hidden; it doesn't produce events,
78 * doesn't appear in sysfs, and can't be opened from userspace or using
79 * blkdev_get*. Used for the underlying components of multipath devices.
81 * ``GENHD_FL_NO_PART``: partition support is disabled. The kernel will not
82 * scan for partitions from add_disk, and users can't add partitions manually.
86 GENHD_FL_REMOVABLE = 1 << 0,
87 GENHD_FL_HIDDEN = 1 << 1,
88 GENHD_FL_NO_PART = 1 << 2,
92 DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */
93 DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */
97 /* Poll even if events_poll_msecs is unset */
98 DISK_EVENT_FLAG_POLL = 1 << 0,
99 /* Forward events to udev */
100 DISK_EVENT_FLAG_UEVENT = 1 << 1,
101 /* Block event polling when open for exclusive write */
102 DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE = 1 << 2,
108 struct blk_integrity {
109 const struct blk_integrity_profile *profile;
111 unsigned char tuple_size;
112 unsigned char pi_offset;
113 unsigned char interval_exp;
114 unsigned char tag_size;
117 typedef unsigned int __bitwise blk_mode_t;
119 /* open for reading */
120 #define BLK_OPEN_READ ((__force blk_mode_t)(1 << 0))
121 /* open for writing */
122 #define BLK_OPEN_WRITE ((__force blk_mode_t)(1 << 1))
123 /* open exclusively (vs other exclusive openers */
124 #define BLK_OPEN_EXCL ((__force blk_mode_t)(1 << 2))
125 /* opened with O_NDELAY */
126 #define BLK_OPEN_NDELAY ((__force blk_mode_t)(1 << 3))
127 /* open for "writes" only for ioctls (specialy hack for floppy.c) */
128 #define BLK_OPEN_WRITE_IOCTL ((__force blk_mode_t)(1 << 4))
129 /* open is exclusive wrt all other BLK_OPEN_WRITE opens to the device */
130 #define BLK_OPEN_RESTRICT_WRITES ((__force blk_mode_t)(1 << 5))
131 /* return partition scanning errors */
132 #define BLK_OPEN_STRICT_SCAN ((__force blk_mode_t)(1 << 6))
136 * major/first_minor/minors should not be set by any new driver, the
137 * block core will take care of allocating them automatically.
143 char disk_name[DISK_NAME_LEN]; /* name of major driver */
145 unsigned short events; /* supported events */
146 unsigned short event_flags; /* flags related to event processing */
148 struct xarray part_tbl;
149 struct block_device *part0;
151 const struct block_device_operations *fops;
152 struct request_queue *queue;
155 struct bio_set bio_split;
159 #define GD_NEED_PART_SCAN 0
160 #define GD_READ_ONLY 1
162 #define GD_NATIVE_CAPACITY 3
164 #define GD_SUPPRESS_PART_SCAN 5
165 #define GD_OWNS_QUEUE 6
167 struct mutex open_mutex; /* open/close mutex */
168 unsigned open_partitions; /* number of open partitions */
170 struct backing_dev_info *bdi;
171 struct kobject queue_kobj; /* the queue/ directory */
172 struct kobject *slave_dir;
173 #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED
174 struct list_head slave_bdevs;
176 struct timer_rand_state *random;
177 atomic_t sync_io; /* RAID */
178 struct disk_events *ev;
180 #ifdef CONFIG_BLK_DEV_ZONED
182 * Zoned block device information. Reads of this information must be
183 * protected with blk_queue_enter() / blk_queue_exit(). Modifying this
184 * information is only allowed while no requests are being processed.
185 * See also blk_mq_freeze_queue() and blk_mq_unfreeze_queue().
187 unsigned int nr_zones;
188 unsigned int zone_capacity;
189 unsigned int last_zone_capacity;
190 unsigned long *conv_zones_bitmap;
191 unsigned int zone_wplugs_hash_bits;
192 spinlock_t zone_wplugs_lock;
193 struct mempool_s *zone_wplugs_pool;
194 struct hlist_head *zone_wplugs_hash;
195 struct list_head zone_wplugs_err_list;
196 struct work_struct zone_wplugs_work;
197 struct workqueue_struct *zone_wplugs_wq;
198 #endif /* CONFIG_BLK_DEV_ZONED */
200 #if IS_ENABLED(CONFIG_CDROM)
201 struct cdrom_device_info *cdi;
204 struct badblocks *bb;
205 struct lockdep_map lockdep_map;
207 blk_mode_t open_mode;
210 * Independent sector access ranges. This is always NULL for
211 * devices that do not have multiple independent access ranges.
213 struct blk_independent_access_ranges *ia_ranges;
217 * disk_openers - returns how many openers are there for a disk
218 * @disk: disk to check
220 * This returns the number of openers for a disk. Note that this value is only
221 * stable if disk->open_mutex is held.
223 * Note: Due to a quirk in the block layer open code, each open partition is
224 * only counted once even if there are multiple openers.
226 static inline unsigned int disk_openers(struct gendisk *disk)
228 return atomic_read(&disk->part0->bd_openers);
232 * disk_has_partscan - return %true if partition scanning is enabled on a disk
233 * @disk: disk to check
235 * Returns %true if partitions scanning is enabled for @disk, or %false if
236 * partition scanning is disabled either permanently or temporarily.
238 static inline bool disk_has_partscan(struct gendisk *disk)
240 return !(disk->flags & (GENHD_FL_NO_PART | GENHD_FL_HIDDEN)) &&
241 !test_bit(GD_SUPPRESS_PART_SCAN, &disk->state);
245 * The gendisk is refcounted by the part0 block_device, and the bd_device
246 * therein is also used for device model presentation in sysfs.
248 #define dev_to_disk(device) \
249 (dev_to_bdev(device)->bd_disk)
250 #define disk_to_dev(disk) \
251 (&((disk)->part0->bd_device))
253 #if IS_REACHABLE(CONFIG_CDROM)
254 #define disk_to_cdi(disk) ((disk)->cdi)
256 #define disk_to_cdi(disk) NULL
259 static inline dev_t disk_devt(struct gendisk *disk)
261 return MKDEV(disk->major, disk->first_minor);
264 static inline int blk_validate_block_size(unsigned long bsize)
266 if (bsize < 512 || bsize > PAGE_SIZE || !is_power_of_2(bsize))
272 static inline bool blk_op_is_passthrough(blk_opf_t op)
275 return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT;
279 * BLK_BOUNCE_NONE: never bounce (default)
280 * BLK_BOUNCE_HIGH: bounce all highmem pages
287 struct queue_limits {
288 enum blk_bounce bounce;
289 unsigned long seg_boundary_mask;
290 unsigned long virt_boundary_mask;
292 unsigned int max_hw_sectors;
293 unsigned int max_dev_sectors;
294 unsigned int chunk_sectors;
295 unsigned int max_sectors;
296 unsigned int max_user_sectors;
297 unsigned int max_segment_size;
298 unsigned int physical_block_size;
299 unsigned int logical_block_size;
300 unsigned int alignment_offset;
303 unsigned int max_discard_sectors;
304 unsigned int max_hw_discard_sectors;
305 unsigned int max_user_discard_sectors;
306 unsigned int max_secure_erase_sectors;
307 unsigned int max_write_zeroes_sectors;
308 unsigned int max_zone_append_sectors;
309 unsigned int discard_granularity;
310 unsigned int discard_alignment;
311 unsigned int zone_write_granularity;
313 unsigned short max_segments;
314 unsigned short max_integrity_segments;
315 unsigned short max_discard_segments;
317 unsigned char misaligned;
318 unsigned char discard_misaligned;
319 unsigned char raid_partial_stripes_expensive;
321 unsigned int max_open_zones;
322 unsigned int max_active_zones;
325 * Drivers that set dma_alignment to less than 511 must be prepared to
326 * handle individual bvec's that are not a multiple of a SECTOR_SIZE
327 * due to possible offsets.
329 unsigned int dma_alignment;
332 typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx,
335 void disk_set_zoned(struct gendisk *disk);
337 #define BLK_ALL_ZONES ((unsigned int)-1)
338 int blkdev_report_zones(struct block_device *bdev, sector_t sector,
339 unsigned int nr_zones, report_zones_cb cb, void *data);
340 int blkdev_zone_mgmt(struct block_device *bdev, enum req_op op,
341 sector_t sectors, sector_t nr_sectors);
342 int blk_revalidate_disk_zones(struct gendisk *disk);
345 * Independent access ranges: struct blk_independent_access_range describes
346 * a range of contiguous sectors that can be accessed using device command
347 * execution resources that are independent from the resources used for
348 * other access ranges. This is typically found with single-LUN multi-actuator
349 * HDDs where each access range is served by a different set of heads.
350 * The set of independent ranges supported by the device is defined using
351 * struct blk_independent_access_ranges. The independent ranges must not overlap
352 * and must include all sectors within the disk capacity (no sector holes
354 * For a device with multiple ranges, requests targeting sectors in different
355 * ranges can be executed in parallel. A request can straddle an access range
358 struct blk_independent_access_range {
364 struct blk_independent_access_ranges {
366 bool sysfs_registered;
367 unsigned int nr_ia_ranges;
368 struct blk_independent_access_range ia_range[];
371 struct request_queue {
373 * The queue owner gets to use this for whatever they like.
374 * ll_rw_blk doesn't touch it.
378 struct elevator_queue *elevator;
380 const struct blk_mq_ops *mq_ops;
383 struct blk_mq_ctx __percpu *queue_ctx;
386 * various queue flags, see QUEUE_* below
388 unsigned long queue_flags;
390 unsigned int rq_timeout;
392 unsigned int queue_depth;
396 /* hw dispatch queues */
397 unsigned int nr_hw_queues;
398 struct xarray hctx_table;
400 struct percpu_ref q_usage_counter;
402 struct request *last_merge;
404 spinlock_t queue_lock;
408 struct gendisk *disk;
413 struct kobject *mq_kobj;
415 struct queue_limits limits;
417 #ifdef CONFIG_BLK_DEV_INTEGRITY
418 struct blk_integrity integrity;
419 #endif /* CONFIG_BLK_DEV_INTEGRITY */
423 enum rpm_status rpm_status;
427 * Number of contexts that have called blk_set_pm_only(). If this
428 * counter is above zero then only RQF_PM requests are processed.
432 struct blk_queue_stats *stats;
433 struct rq_qos *rq_qos;
434 struct mutex rq_qos_mutex;
437 * ida allocated id for this queue. Used to index queues from
442 unsigned int dma_pad_mask;
447 unsigned long nr_requests; /* Max # of requests */
449 #ifdef CONFIG_BLK_INLINE_ENCRYPTION
450 struct blk_crypto_profile *crypto_profile;
451 struct kobject *crypto_kobject;
454 struct timer_list timeout;
455 struct work_struct timeout_work;
457 atomic_t nr_active_requests_shared_tags;
459 struct blk_mq_tags *sched_shared_tags;
461 struct list_head icq_list;
462 #ifdef CONFIG_BLK_CGROUP
463 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
464 struct blkcg_gq *root_blkg;
465 struct list_head blkg_list;
466 struct mutex blkcg_mutex;
471 spinlock_t requeue_lock;
472 struct list_head requeue_list;
473 struct delayed_work requeue_work;
475 #ifdef CONFIG_BLK_DEV_IO_TRACE
476 struct blk_trace __rcu *blk_trace;
479 * for flush operations
481 struct blk_flush_queue *fq;
482 struct list_head flush_list;
484 struct mutex sysfs_lock;
485 struct mutex sysfs_dir_lock;
486 struct mutex limits_lock;
489 * for reusing dead hctx instance in case of updating
492 struct list_head unused_hctx_list;
493 spinlock_t unused_hctx_lock;
497 #ifdef CONFIG_BLK_DEV_THROTTLING
499 struct throtl_data *td;
501 struct rcu_head rcu_head;
502 wait_queue_head_t mq_freeze_wq;
504 * Protect concurrent access to q_usage_counter by
505 * percpu_ref_kill() and percpu_ref_reinit().
507 struct mutex mq_freeze_lock;
509 struct blk_mq_tag_set *tag_set;
510 struct list_head tag_set_list;
512 struct dentry *debugfs_dir;
513 struct dentry *sched_debugfs_dir;
514 struct dentry *rqos_debugfs_dir;
516 * Serializes all debugfs metadata operations using the above dentries.
518 struct mutex debugfs_mutex;
520 bool mq_sysfs_init_done;
523 /* Keep blk_queue_flag_name[] in sync with the definitions below */
524 #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */
525 #define QUEUE_FLAG_DYING 1 /* queue being torn down */
526 #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */
527 #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */
528 #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */
529 #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */
530 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
531 #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */
532 #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */
533 #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */
534 #define QUEUE_FLAG_SYNCHRONOUS 11 /* always completes in submit context */
535 #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */
536 #define QUEUE_FLAG_HW_WC 13 /* Write back caching supported */
537 #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */
538 #define QUEUE_FLAG_STABLE_WRITES 15 /* don't modify blks until WB is done */
539 #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */
540 #define QUEUE_FLAG_WC 17 /* Write back caching */
541 #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */
542 #define QUEUE_FLAG_DAX 19 /* device supports DAX */
543 #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */
544 #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */
545 #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */
546 #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */
547 #define QUEUE_FLAG_ZONE_RESETALL 26 /* supports Zone Reset All */
548 #define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */
549 #define QUEUE_FLAG_HCTX_ACTIVE 28 /* at least one blk-mq hctx is active */
550 #define QUEUE_FLAG_NOWAIT 29 /* device supports NOWAIT */
551 #define QUEUE_FLAG_SQ_SCHED 30 /* single queue style io dispatch */
552 #define QUEUE_FLAG_SKIP_TAGSET_QUIESCE 31 /* quiesce_tagset skip the queue*/
554 #define QUEUE_FLAG_MQ_DEFAULT ((1UL << QUEUE_FLAG_IO_STAT) | \
555 (1UL << QUEUE_FLAG_SAME_COMP) | \
556 (1UL << QUEUE_FLAG_NOWAIT))
558 void blk_queue_flag_set(unsigned int flag, struct request_queue *q);
559 void blk_queue_flag_clear(unsigned int flag, struct request_queue *q);
560 bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
562 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
563 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
564 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
565 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
566 #define blk_queue_noxmerges(q) \
567 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
568 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
569 #define blk_queue_stable_writes(q) \
570 test_bit(QUEUE_FLAG_STABLE_WRITES, &(q)->queue_flags)
571 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
572 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
573 #define blk_queue_zone_resetall(q) \
574 test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags)
575 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
576 #define blk_queue_pci_p2pdma(q) \
577 test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags)
578 #ifdef CONFIG_BLK_RQ_ALLOC_TIME
579 #define blk_queue_rq_alloc_time(q) \
580 test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags)
582 #define blk_queue_rq_alloc_time(q) false
585 #define blk_noretry_request(rq) \
586 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
587 REQ_FAILFAST_DRIVER))
588 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
589 #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only)
590 #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags)
591 #define blk_queue_sq_sched(q) test_bit(QUEUE_FLAG_SQ_SCHED, &(q)->queue_flags)
592 #define blk_queue_skip_tagset_quiesce(q) \
593 test_bit(QUEUE_FLAG_SKIP_TAGSET_QUIESCE, &(q)->queue_flags)
595 extern void blk_set_pm_only(struct request_queue *q);
596 extern void blk_clear_pm_only(struct request_queue *q);
598 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
600 #define dma_map_bvec(dev, bv, dir, attrs) \
601 dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \
604 static inline bool queue_is_mq(struct request_queue *q)
610 static inline enum rpm_status queue_rpm_status(struct request_queue *q)
612 return q->rpm_status;
615 static inline enum rpm_status queue_rpm_status(struct request_queue *q)
621 static inline bool blk_queue_is_zoned(struct request_queue *q)
623 return IS_ENABLED(CONFIG_BLK_DEV_ZONED) && q->limits.zoned;
626 #ifdef CONFIG_BLK_DEV_ZONED
627 unsigned int bdev_nr_zones(struct block_device *bdev);
629 static inline unsigned int disk_nr_zones(struct gendisk *disk)
631 return blk_queue_is_zoned(disk->queue) ? disk->nr_zones : 0;
634 static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector)
636 if (!blk_queue_is_zoned(disk->queue))
638 return sector >> ilog2(disk->queue->limits.chunk_sectors);
641 static inline void disk_set_max_open_zones(struct gendisk *disk,
642 unsigned int max_open_zones)
644 disk->queue->limits.max_open_zones = max_open_zones;
647 static inline void disk_set_max_active_zones(struct gendisk *disk,
648 unsigned int max_active_zones)
650 disk->queue->limits.max_active_zones = max_active_zones;
653 static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
655 return bdev->bd_disk->queue->limits.max_open_zones;
658 static inline unsigned int bdev_max_active_zones(struct block_device *bdev)
660 return bdev->bd_disk->queue->limits.max_active_zones;
663 bool blk_zone_plug_bio(struct bio *bio, unsigned int nr_segs);
664 #else /* CONFIG_BLK_DEV_ZONED */
665 static inline unsigned int bdev_nr_zones(struct block_device *bdev)
670 static inline unsigned int disk_nr_zones(struct gendisk *disk)
674 static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector)
678 static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
683 static inline unsigned int bdev_max_active_zones(struct block_device *bdev)
687 static inline bool blk_zone_plug_bio(struct bio *bio, unsigned int nr_segs)
691 #endif /* CONFIG_BLK_DEV_ZONED */
693 static inline unsigned int blk_queue_depth(struct request_queue *q)
696 return q->queue_depth;
698 return q->nr_requests;
702 * default timeout for SG_IO if none specified
704 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
705 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
707 /* This should not be used directly - use rq_for_each_segment */
708 #define for_each_bio(_bio) \
709 for (; _bio; _bio = _bio->bi_next)
711 int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
712 const struct attribute_group **groups);
713 static inline int __must_check add_disk(struct gendisk *disk)
715 return device_add_disk(NULL, disk, NULL);
717 void del_gendisk(struct gendisk *gp);
718 void invalidate_disk(struct gendisk *disk);
719 void set_disk_ro(struct gendisk *disk, bool read_only);
720 void disk_uevent(struct gendisk *disk, enum kobject_action action);
722 static inline u8 bdev_partno(const struct block_device *bdev)
724 return atomic_read(&bdev->__bd_flags) & BD_PARTNO;
727 static inline bool bdev_test_flag(const struct block_device *bdev, unsigned flag)
729 return atomic_read(&bdev->__bd_flags) & flag;
732 static inline void bdev_set_flag(struct block_device *bdev, unsigned flag)
734 atomic_or(flag, &bdev->__bd_flags);
737 static inline void bdev_clear_flag(struct block_device *bdev, unsigned flag)
739 atomic_andnot(flag, &bdev->__bd_flags);
742 static inline int get_disk_ro(struct gendisk *disk)
744 return bdev_test_flag(disk->part0, BD_READ_ONLY) ||
745 test_bit(GD_READ_ONLY, &disk->state);
748 static inline int bdev_read_only(struct block_device *bdev)
750 return bdev_test_flag(bdev, BD_READ_ONLY) || get_disk_ro(bdev->bd_disk);
753 bool set_capacity_and_notify(struct gendisk *disk, sector_t size);
754 void disk_force_media_change(struct gendisk *disk);
755 void bdev_mark_dead(struct block_device *bdev, bool surprise);
757 void add_disk_randomness(struct gendisk *disk) __latent_entropy;
758 void rand_initialize_disk(struct gendisk *disk);
760 static inline sector_t get_start_sect(struct block_device *bdev)
762 return bdev->bd_start_sect;
765 static inline sector_t bdev_nr_sectors(struct block_device *bdev)
767 return bdev->bd_nr_sectors;
770 static inline loff_t bdev_nr_bytes(struct block_device *bdev)
772 return (loff_t)bdev_nr_sectors(bdev) << SECTOR_SHIFT;
775 static inline sector_t get_capacity(struct gendisk *disk)
777 return bdev_nr_sectors(disk->part0);
780 static inline u64 sb_bdev_nr_blocks(struct super_block *sb)
782 return bdev_nr_sectors(sb->s_bdev) >>
783 (sb->s_blocksize_bits - SECTOR_SHIFT);
786 int bdev_disk_changed(struct gendisk *disk, bool invalidate);
788 void put_disk(struct gendisk *disk);
789 struct gendisk *__blk_alloc_disk(struct queue_limits *lim, int node,
790 struct lock_class_key *lkclass);
793 * blk_alloc_disk - allocate a gendisk structure
794 * @lim: queue limits to be used for this disk.
795 * @node_id: numa node to allocate on
797 * Allocate and pre-initialize a gendisk structure for use with BIO based
800 * Returns an ERR_PTR on error, else the allocated disk.
804 #define blk_alloc_disk(lim, node_id) \
806 static struct lock_class_key __key; \
808 __blk_alloc_disk(lim, node_id, &__key); \
811 int __register_blkdev(unsigned int major, const char *name,
812 void (*probe)(dev_t devt));
813 #define register_blkdev(major, name) \
814 __register_blkdev(major, name, NULL)
815 void unregister_blkdev(unsigned int major, const char *name);
817 bool disk_check_media_change(struct gendisk *disk);
818 void set_capacity(struct gendisk *disk, sector_t size);
820 #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED
821 int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
822 void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk);
824 static inline int bd_link_disk_holder(struct block_device *bdev,
825 struct gendisk *disk)
829 static inline void bd_unlink_disk_holder(struct block_device *bdev,
830 struct gendisk *disk)
833 #endif /* CONFIG_BLOCK_HOLDER_DEPRECATED */
835 dev_t part_devt(struct gendisk *disk, u8 partno);
836 void inc_diskseq(struct gendisk *disk);
837 void blk_request_module(dev_t devt);
839 extern int blk_register_queue(struct gendisk *disk);
840 extern void blk_unregister_queue(struct gendisk *disk);
841 void submit_bio_noacct(struct bio *bio);
842 struct bio *bio_split_to_limits(struct bio *bio);
844 extern int blk_lld_busy(struct request_queue *q);
845 extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags);
846 extern void blk_queue_exit(struct request_queue *q);
847 extern void blk_sync_queue(struct request_queue *q);
849 /* Helper to convert REQ_OP_XXX to its string format XXX */
850 extern const char *blk_op_str(enum req_op op);
852 int blk_status_to_errno(blk_status_t status);
853 blk_status_t errno_to_blk_status(int errno);
854 const char *blk_status_to_str(blk_status_t status);
856 /* only poll the hardware once, don't continue until a completion was found */
857 #define BLK_POLL_ONESHOT (1 << 0)
858 int bio_poll(struct bio *bio, struct io_comp_batch *iob, unsigned int flags);
859 int iocb_bio_iopoll(struct kiocb *kiocb, struct io_comp_batch *iob,
862 static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
864 return bdev->bd_queue; /* this is never NULL */
867 /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */
868 const char *blk_zone_cond_str(enum blk_zone_cond zone_cond);
870 static inline unsigned int bio_zone_no(struct bio *bio)
872 return disk_zone_no(bio->bi_bdev->bd_disk, bio->bi_iter.bi_sector);
875 static inline bool bio_straddles_zones(struct bio *bio)
877 return bio_sectors(bio) &&
879 disk_zone_no(bio->bi_bdev->bd_disk, bio_end_sector(bio) - 1);
883 * Return how much of the chunk is left to be used for I/O at a given offset.
885 static inline unsigned int blk_chunk_sectors_left(sector_t offset,
886 unsigned int chunk_sectors)
888 if (unlikely(!is_power_of_2(chunk_sectors)))
889 return chunk_sectors - sector_div(offset, chunk_sectors);
890 return chunk_sectors - (offset & (chunk_sectors - 1));
894 * queue_limits_start_update - start an atomic update of queue limits
895 * @q: queue to update
897 * This functions starts an atomic update of the queue limits. It takes a lock
898 * to prevent other updates and returns a snapshot of the current limits that
899 * the caller can modify. The caller must call queue_limits_commit_update()
900 * to finish the update.
902 * Context: process context. The caller must have frozen the queue or ensured
903 * that there is outstanding I/O by other means.
905 static inline struct queue_limits
906 queue_limits_start_update(struct request_queue *q)
907 __acquires(q->limits_lock)
909 mutex_lock(&q->limits_lock);
912 int queue_limits_commit_update(struct request_queue *q,
913 struct queue_limits *lim);
914 int queue_limits_set(struct request_queue *q, struct queue_limits *lim);
917 * queue_limits_cancel_update - cancel an atomic update of queue limits
918 * @q: queue to update
920 * This functions cancels an atomic update of the queue limits started by
921 * queue_limits_start_update() and should be used when an error occurs after
924 static inline void queue_limits_cancel_update(struct request_queue *q)
926 mutex_unlock(&q->limits_lock);
930 * Access functions for manipulating queue properties
932 extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
933 void blk_queue_max_secure_erase_sectors(struct request_queue *q,
934 unsigned int max_sectors);
935 extern void blk_queue_max_discard_sectors(struct request_queue *q,
936 unsigned int max_discard_sectors);
937 extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
938 unsigned int max_write_same_sectors);
939 extern void blk_queue_logical_block_size(struct request_queue *, unsigned int);
940 extern void blk_queue_max_zone_append_sectors(struct request_queue *q,
941 unsigned int max_zone_append_sectors);
942 extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
943 void blk_queue_zone_write_granularity(struct request_queue *q,
945 extern void blk_queue_alignment_offset(struct request_queue *q,
946 unsigned int alignment);
947 void disk_update_readahead(struct gendisk *disk);
948 extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
949 extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
950 extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
951 extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
952 extern void blk_set_stacking_limits(struct queue_limits *lim);
953 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
955 void queue_limits_stack_bdev(struct queue_limits *t, struct block_device *bdev,
956 sector_t offset, const char *pfx);
957 extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
958 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
959 extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
961 struct blk_independent_access_ranges *
962 disk_alloc_independent_access_ranges(struct gendisk *disk, int nr_ia_ranges);
963 void disk_set_independent_access_ranges(struct gendisk *disk,
964 struct blk_independent_access_ranges *iars);
966 bool __must_check blk_get_queue(struct request_queue *);
967 extern void blk_put_queue(struct request_queue *);
969 void blk_mark_disk_dead(struct gendisk *disk);
973 * blk_plug permits building a queue of related requests by holding the I/O
974 * fragments for a short period. This allows merging of sequential requests
975 * into single larger request. As the requests are moved from a per-task list to
976 * the device's request_queue in a batch, this results in improved scalability
977 * as the lock contention for request_queue lock is reduced.
979 * It is ok not to disable preemption when adding the request to the plug list
980 * or when attempting a merge. For details, please see schedule() where
981 * blk_flush_plug() is called.
984 struct request *mq_list; /* blk-mq requests */
986 /* if ios_left is > 1, we can batch tag/rq allocations */
987 struct request *cached_rq;
989 unsigned short nr_ios;
991 unsigned short rq_count;
993 bool multiple_queues;
996 struct list_head cb_list; /* md requires an unplug callback */
1000 typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
1001 struct blk_plug_cb {
1002 struct list_head list;
1003 blk_plug_cb_fn callback;
1006 extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
1007 void *data, int size);
1008 extern void blk_start_plug(struct blk_plug *);
1009 extern void blk_start_plug_nr_ios(struct blk_plug *, unsigned short);
1010 extern void blk_finish_plug(struct blk_plug *);
1012 void __blk_flush_plug(struct blk_plug *plug, bool from_schedule);
1013 static inline void blk_flush_plug(struct blk_plug *plug, bool async)
1016 __blk_flush_plug(plug, async);
1020 * tsk == current here
1022 static inline void blk_plug_invalidate_ts(struct task_struct *tsk)
1024 struct blk_plug *plug = tsk->plug;
1027 plug->cur_ktime = 0;
1028 current->flags &= ~PF_BLOCK_TS;
1031 int blkdev_issue_flush(struct block_device *bdev);
1032 long nr_blockdev_pages(void);
1033 #else /* CONFIG_BLOCK */
1037 static inline void blk_start_plug_nr_ios(struct blk_plug *plug,
1038 unsigned short nr_ios)
1042 static inline void blk_start_plug(struct blk_plug *plug)
1046 static inline void blk_finish_plug(struct blk_plug *plug)
1050 static inline void blk_flush_plug(struct blk_plug *plug, bool async)
1054 static inline void blk_plug_invalidate_ts(struct task_struct *tsk)
1058 static inline int blkdev_issue_flush(struct block_device *bdev)
1063 static inline long nr_blockdev_pages(void)
1067 #endif /* CONFIG_BLOCK */
1069 extern void blk_io_schedule(void);
1071 int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1072 sector_t nr_sects, gfp_t gfp_mask);
1073 int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1074 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop);
1075 int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector,
1076 sector_t nr_sects, gfp_t gfp);
1078 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
1079 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
1081 extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1082 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
1084 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1085 sector_t nr_sects, gfp_t gfp_mask, unsigned flags);
1087 static inline int sb_issue_discard(struct super_block *sb, sector_t block,
1088 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
1090 return blkdev_issue_discard(sb->s_bdev,
1091 block << (sb->s_blocksize_bits -
1093 nr_blocks << (sb->s_blocksize_bits -
1097 static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
1098 sector_t nr_blocks, gfp_t gfp_mask)
1100 return blkdev_issue_zeroout(sb->s_bdev,
1101 block << (sb->s_blocksize_bits -
1103 nr_blocks << (sb->s_blocksize_bits -
1108 static inline bool bdev_is_partition(struct block_device *bdev)
1110 return bdev_partno(bdev) != 0;
1113 enum blk_default_limits {
1114 BLK_MAX_SEGMENTS = 128,
1115 BLK_SAFE_MAX_SECTORS = 255,
1116 BLK_MAX_SEGMENT_SIZE = 65536,
1117 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
1121 * Default upper limit for the software max_sectors limit used for
1122 * regular file system I/O. This can be increased through sysfs.
1124 * Not to be confused with the max_hw_sector limit that is entirely
1125 * controlled by the driver, usually based on hardware limits.
1127 #define BLK_DEF_MAX_SECTORS_CAP 2560u
1129 static inline unsigned long queue_segment_boundary(const struct request_queue *q)
1131 return q->limits.seg_boundary_mask;
1134 static inline unsigned long queue_virt_boundary(const struct request_queue *q)
1136 return q->limits.virt_boundary_mask;
1139 static inline unsigned int queue_max_sectors(const struct request_queue *q)
1141 return q->limits.max_sectors;
1144 static inline unsigned int queue_max_bytes(struct request_queue *q)
1146 return min_t(unsigned int, queue_max_sectors(q), INT_MAX >> 9) << 9;
1149 static inline unsigned int queue_max_hw_sectors(const struct request_queue *q)
1151 return q->limits.max_hw_sectors;
1154 static inline unsigned short queue_max_segments(const struct request_queue *q)
1156 return q->limits.max_segments;
1159 static inline unsigned short queue_max_discard_segments(const struct request_queue *q)
1161 return q->limits.max_discard_segments;
1164 static inline unsigned int queue_max_segment_size(const struct request_queue *q)
1166 return q->limits.max_segment_size;
1169 static inline unsigned int queue_limits_max_zone_append_sectors(struct queue_limits *l)
1171 unsigned int max_sectors = min(l->chunk_sectors, l->max_hw_sectors);
1173 return min_not_zero(l->max_zone_append_sectors, max_sectors);
1176 static inline unsigned int queue_max_zone_append_sectors(struct request_queue *q)
1178 if (!blk_queue_is_zoned(q))
1181 return queue_limits_max_zone_append_sectors(&q->limits);
1184 static inline bool queue_emulates_zone_append(struct request_queue *q)
1186 return blk_queue_is_zoned(q) && !q->limits.max_zone_append_sectors;
1189 static inline bool bdev_emulates_zone_append(struct block_device *bdev)
1191 return queue_emulates_zone_append(bdev_get_queue(bdev));
1194 static inline unsigned int
1195 bdev_max_zone_append_sectors(struct block_device *bdev)
1197 return queue_max_zone_append_sectors(bdev_get_queue(bdev));
1200 static inline unsigned int bdev_max_segments(struct block_device *bdev)
1202 return queue_max_segments(bdev_get_queue(bdev));
1205 static inline unsigned queue_logical_block_size(const struct request_queue *q)
1209 if (q && q->limits.logical_block_size)
1210 retval = q->limits.logical_block_size;
1215 static inline unsigned int bdev_logical_block_size(struct block_device *bdev)
1217 return queue_logical_block_size(bdev_get_queue(bdev));
1220 static inline unsigned int queue_physical_block_size(const struct request_queue *q)
1222 return q->limits.physical_block_size;
1225 static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
1227 return queue_physical_block_size(bdev_get_queue(bdev));
1230 static inline unsigned int queue_io_min(const struct request_queue *q)
1232 return q->limits.io_min;
1235 static inline int bdev_io_min(struct block_device *bdev)
1237 return queue_io_min(bdev_get_queue(bdev));
1240 static inline unsigned int queue_io_opt(const struct request_queue *q)
1242 return q->limits.io_opt;
1245 static inline int bdev_io_opt(struct block_device *bdev)
1247 return queue_io_opt(bdev_get_queue(bdev));
1250 static inline unsigned int
1251 queue_zone_write_granularity(const struct request_queue *q)
1253 return q->limits.zone_write_granularity;
1256 static inline unsigned int
1257 bdev_zone_write_granularity(struct block_device *bdev)
1259 return queue_zone_write_granularity(bdev_get_queue(bdev));
1262 int bdev_alignment_offset(struct block_device *bdev);
1263 unsigned int bdev_discard_alignment(struct block_device *bdev);
1265 static inline unsigned int bdev_max_discard_sectors(struct block_device *bdev)
1267 return bdev_get_queue(bdev)->limits.max_discard_sectors;
1270 static inline unsigned int bdev_discard_granularity(struct block_device *bdev)
1272 return bdev_get_queue(bdev)->limits.discard_granularity;
1275 static inline unsigned int
1276 bdev_max_secure_erase_sectors(struct block_device *bdev)
1278 return bdev_get_queue(bdev)->limits.max_secure_erase_sectors;
1281 static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
1283 struct request_queue *q = bdev_get_queue(bdev);
1286 return q->limits.max_write_zeroes_sectors;
1291 static inline bool bdev_nonrot(struct block_device *bdev)
1293 return blk_queue_nonrot(bdev_get_queue(bdev));
1296 static inline bool bdev_synchronous(struct block_device *bdev)
1298 return test_bit(QUEUE_FLAG_SYNCHRONOUS,
1299 &bdev_get_queue(bdev)->queue_flags);
1302 static inline bool bdev_stable_writes(struct block_device *bdev)
1304 return test_bit(QUEUE_FLAG_STABLE_WRITES,
1305 &bdev_get_queue(bdev)->queue_flags);
1308 static inline bool bdev_write_cache(struct block_device *bdev)
1310 return test_bit(QUEUE_FLAG_WC, &bdev_get_queue(bdev)->queue_flags);
1313 static inline bool bdev_fua(struct block_device *bdev)
1315 return test_bit(QUEUE_FLAG_FUA, &bdev_get_queue(bdev)->queue_flags);
1318 static inline bool bdev_nowait(struct block_device *bdev)
1320 return test_bit(QUEUE_FLAG_NOWAIT, &bdev_get_queue(bdev)->queue_flags);
1323 static inline bool bdev_is_zoned(struct block_device *bdev)
1325 return blk_queue_is_zoned(bdev_get_queue(bdev));
1328 static inline unsigned int bdev_zone_no(struct block_device *bdev, sector_t sec)
1330 return disk_zone_no(bdev->bd_disk, sec);
1333 static inline sector_t bdev_zone_sectors(struct block_device *bdev)
1335 struct request_queue *q = bdev_get_queue(bdev);
1337 if (!blk_queue_is_zoned(q))
1339 return q->limits.chunk_sectors;
1342 static inline sector_t bdev_offset_from_zone_start(struct block_device *bdev,
1345 return sector & (bdev_zone_sectors(bdev) - 1);
1348 static inline sector_t bio_offset_from_zone_start(struct bio *bio)
1350 return bdev_offset_from_zone_start(bio->bi_bdev,
1351 bio->bi_iter.bi_sector);
1354 static inline bool bdev_is_zone_start(struct block_device *bdev,
1357 return bdev_offset_from_zone_start(bdev, sector) == 0;
1360 static inline int queue_dma_alignment(const struct request_queue *q)
1362 return q ? q->limits.dma_alignment : 511;
1365 static inline unsigned int bdev_dma_alignment(struct block_device *bdev)
1367 return queue_dma_alignment(bdev_get_queue(bdev));
1370 static inline bool bdev_iter_is_aligned(struct block_device *bdev,
1371 struct iov_iter *iter)
1373 return iov_iter_is_aligned(iter, bdev_dma_alignment(bdev),
1374 bdev_logical_block_size(bdev) - 1);
1377 static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
1380 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
1381 return !(addr & alignment) && !(len & alignment);
1384 /* assumes size > 256 */
1385 static inline unsigned int blksize_bits(unsigned int size)
1387 return order_base_2(size >> SECTOR_SHIFT) + SECTOR_SHIFT;
1390 int kblockd_schedule_work(struct work_struct *work);
1391 int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
1393 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1394 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1395 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1396 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1398 #ifdef CONFIG_BLK_INLINE_ENCRYPTION
1400 bool blk_crypto_register(struct blk_crypto_profile *profile,
1401 struct request_queue *q);
1403 #else /* CONFIG_BLK_INLINE_ENCRYPTION */
1405 static inline bool blk_crypto_register(struct blk_crypto_profile *profile,
1406 struct request_queue *q)
1411 #endif /* CONFIG_BLK_INLINE_ENCRYPTION */
1413 enum blk_unique_id {
1414 /* these match the Designator Types specified in SPC */
1420 struct block_device_operations {
1421 void (*submit_bio)(struct bio *bio);
1422 int (*poll_bio)(struct bio *bio, struct io_comp_batch *iob,
1423 unsigned int flags);
1424 int (*open)(struct gendisk *disk, blk_mode_t mode);
1425 void (*release)(struct gendisk *disk);
1426 int (*ioctl)(struct block_device *bdev, blk_mode_t mode,
1427 unsigned cmd, unsigned long arg);
1428 int (*compat_ioctl)(struct block_device *bdev, blk_mode_t mode,
1429 unsigned cmd, unsigned long arg);
1430 unsigned int (*check_events) (struct gendisk *disk,
1431 unsigned int clearing);
1432 void (*unlock_native_capacity) (struct gendisk *);
1433 int (*getgeo)(struct block_device *, struct hd_geometry *);
1434 int (*set_read_only)(struct block_device *bdev, bool ro);
1435 void (*free_disk)(struct gendisk *disk);
1436 /* this callback is with swap_lock and sometimes page table lock held */
1437 void (*swap_slot_free_notify) (struct block_device *, unsigned long);
1438 int (*report_zones)(struct gendisk *, sector_t sector,
1439 unsigned int nr_zones, report_zones_cb cb, void *data);
1440 char *(*devnode)(struct gendisk *disk, umode_t *mode);
1441 /* returns the length of the identifier or a negative errno: */
1442 int (*get_unique_id)(struct gendisk *disk, u8 id[16],
1443 enum blk_unique_id id_type);
1444 struct module *owner;
1445 const struct pr_ops *pr_ops;
1448 * Special callback for probing GPT entry at a given sector.
1449 * Needed by Android devices, used by GPT scanner and MMC blk
1452 int (*alternative_gpt_sector)(struct gendisk *disk, sector_t *sector);
1455 #ifdef CONFIG_COMPAT
1456 extern int blkdev_compat_ptr_ioctl(struct block_device *, blk_mode_t,
1457 unsigned int, unsigned long);
1459 #define blkdev_compat_ptr_ioctl NULL
1462 static inline void blk_wake_io_task(struct task_struct *waiter)
1465 * If we're polling, the task itself is doing the completions. For
1466 * that case, we don't need to signal a wakeup, it's enough to just
1467 * mark us as RUNNING.
1469 if (waiter == current)
1470 __set_current_state(TASK_RUNNING);
1472 wake_up_process(waiter);
1475 unsigned long bdev_start_io_acct(struct block_device *bdev, enum req_op op,
1476 unsigned long start_time);
1477 void bdev_end_io_acct(struct block_device *bdev, enum req_op op,
1478 unsigned int sectors, unsigned long start_time);
1480 unsigned long bio_start_io_acct(struct bio *bio);
1481 void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time,
1482 struct block_device *orig_bdev);
1485 * bio_end_io_acct - end I/O accounting for bio based drivers
1486 * @bio: bio to end account for
1487 * @start_time: start time returned by bio_start_io_acct()
1489 static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time)
1491 return bio_end_io_acct_remapped(bio, start_time, bio->bi_bdev);
1494 int bdev_read_only(struct block_device *bdev);
1495 int set_blocksize(struct file *file, int size);
1497 int lookup_bdev(const char *pathname, dev_t *dev);
1499 void blkdev_show(struct seq_file *seqf, off_t offset);
1501 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1502 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
1504 #define BLKDEV_MAJOR_MAX 512
1506 #define BLKDEV_MAJOR_MAX 0
1509 struct blk_holder_ops {
1510 void (*mark_dead)(struct block_device *bdev, bool surprise);
1513 * Sync the file system mounted on the block device.
1515 void (*sync)(struct block_device *bdev);
1518 * Freeze the file system mounted on the block device.
1520 int (*freeze)(struct block_device *bdev);
1523 * Thaw the file system mounted on the block device.
1525 int (*thaw)(struct block_device *bdev);
1529 * For filesystems using @fs_holder_ops, the @holder argument passed to
1530 * helpers used to open and claim block devices via
1531 * bd_prepare_to_claim() must point to a superblock.
1533 extern const struct blk_holder_ops fs_holder_ops;
1536 * Return the correct open flags for blkdev_get_by_* for super block flags
1537 * as stored in sb->s_flags.
1539 #define sb_open_mode(flags) \
1540 (BLK_OPEN_READ | BLK_OPEN_RESTRICT_WRITES | \
1541 (((flags) & SB_RDONLY) ? 0 : BLK_OPEN_WRITE))
1543 struct file *bdev_file_open_by_dev(dev_t dev, blk_mode_t mode, void *holder,
1544 const struct blk_holder_ops *hops);
1545 struct file *bdev_file_open_by_path(const char *path, blk_mode_t mode,
1546 void *holder, const struct blk_holder_ops *hops);
1547 int bd_prepare_to_claim(struct block_device *bdev, void *holder,
1548 const struct blk_holder_ops *hops);
1549 void bd_abort_claiming(struct block_device *bdev, void *holder);
1551 /* just for blk-cgroup, don't use elsewhere */
1552 struct block_device *blkdev_get_no_open(dev_t dev);
1553 void blkdev_put_no_open(struct block_device *bdev);
1555 struct block_device *I_BDEV(struct inode *inode);
1556 struct block_device *file_bdev(struct file *bdev_file);
1557 bool disk_live(struct gendisk *disk);
1558 unsigned int block_size(struct block_device *bdev);
1561 void invalidate_bdev(struct block_device *bdev);
1562 int sync_blockdev(struct block_device *bdev);
1563 int sync_blockdev_range(struct block_device *bdev, loff_t lstart, loff_t lend);
1564 int sync_blockdev_nowait(struct block_device *bdev);
1565 void sync_bdevs(bool wait);
1566 void bdev_statx_dioalign(struct inode *inode, struct kstat *stat);
1567 void printk_all_partitions(void);
1568 int __init early_lookup_bdev(const char *pathname, dev_t *dev);
1570 static inline void invalidate_bdev(struct block_device *bdev)
1573 static inline int sync_blockdev(struct block_device *bdev)
1577 static inline int sync_blockdev_nowait(struct block_device *bdev)
1581 static inline void sync_bdevs(bool wait)
1584 static inline void bdev_statx_dioalign(struct inode *inode, struct kstat *stat)
1587 static inline void printk_all_partitions(void)
1590 static inline int early_lookup_bdev(const char *pathname, dev_t *dev)
1594 #endif /* CONFIG_BLOCK */
1596 int bdev_freeze(struct block_device *bdev);
1597 int bdev_thaw(struct block_device *bdev);
1598 void bdev_fput(struct file *bdev_file);
1600 struct io_comp_batch {
1601 struct request *req_list;
1603 void (*complete)(struct io_comp_batch *);
1606 #define DEFINE_IO_COMP_BATCH(name) struct io_comp_batch name = { }
1608 #endif /* _LINUX_BLKDEV_H */