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/srcu.h>
26 #include <linux/uuid.h>
27 #include <linux/xarray.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 struct device_type part_type;
46 extern struct class block_class;
48 /* Must be consistent with blk_mq_poll_stats_bkt() */
49 #define BLK_MQ_POLL_STATS_BKTS 16
51 /* Doing classic polling */
52 #define BLK_MQ_POLL_CLASSIC -1
55 * Maximum number of blkcg policies allowed to be registered concurrently.
56 * Defined here to simplify include dependency.
58 #define BLKCG_MAX_POLS 6
60 #define DISK_MAX_PARTS 256
61 #define DISK_NAME_LEN 32
63 #define PARTITION_META_INFO_VOLNAMELTH 64
65 * Enough for the string representation of any kind of UUID plus NULL.
66 * EFI UUID is 36 characters. MSDOS UUID is 11 characters.
68 #define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1)
70 struct partition_meta_info {
71 char uuid[PARTITION_META_INFO_UUIDLTH];
72 u8 volname[PARTITION_META_INFO_VOLNAMELTH];
76 * DOC: genhd capability flags
78 * ``GENHD_FL_REMOVABLE``: indicates that the block device gives access to
79 * removable media. When set, the device remains present even when media is not
80 * inserted. Shall not be set for devices which are removed entirely when the
83 * ``GENHD_FL_HIDDEN``: the block device is hidden; it doesn't produce events,
84 * doesn't appear in sysfs, and can't be opened from userspace or using
85 * blkdev_get*. Used for the underlying components of multipath devices.
87 * ``GENHD_FL_NO_PART``: partition support is disabled. The kernel will not
88 * scan for partitions from add_disk, and users can't add partitions manually.
92 GENHD_FL_REMOVABLE = 1 << 0,
93 GENHD_FL_HIDDEN = 1 << 1,
94 GENHD_FL_NO_PART = 1 << 2,
98 DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */
99 DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */
103 /* Poll even if events_poll_msecs is unset */
104 DISK_EVENT_FLAG_POLL = 1 << 0,
105 /* Forward events to udev */
106 DISK_EVENT_FLAG_UEVENT = 1 << 1,
107 /* Block event polling when open for exclusive write */
108 DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE = 1 << 2,
114 struct blk_integrity {
115 const struct blk_integrity_profile *profile;
117 unsigned char tuple_size;
118 unsigned char interval_exp;
119 unsigned char tag_size;
124 * major/first_minor/minors should not be set by any new driver, the
125 * block core will take care of allocating them automatically.
131 char disk_name[DISK_NAME_LEN]; /* name of major driver */
133 unsigned short events; /* supported events */
134 unsigned short event_flags; /* flags related to event processing */
136 struct xarray part_tbl;
137 struct block_device *part0;
139 const struct block_device_operations *fops;
140 struct request_queue *queue;
143 struct bio_set bio_split;
147 #define GD_NEED_PART_SCAN 0
148 #define GD_READ_ONLY 1
150 #define GD_NATIVE_CAPACITY 3
152 #define GD_SUPPRESS_PART_SCAN 5
153 #define GD_OWNS_QUEUE 6
155 struct mutex open_mutex; /* open/close mutex */
156 unsigned open_partitions; /* number of open partitions */
158 struct backing_dev_info *bdi;
159 struct kobject *slave_dir;
160 #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED
161 struct list_head slave_bdevs;
163 struct timer_rand_state *random;
164 atomic_t sync_io; /* RAID */
165 struct disk_events *ev;
166 #ifdef CONFIG_BLK_DEV_INTEGRITY
167 struct kobject integrity_kobj;
168 #endif /* CONFIG_BLK_DEV_INTEGRITY */
170 #ifdef CONFIG_BLK_DEV_ZONED
172 * Zoned block device information for request dispatch control.
173 * nr_zones is the total number of zones of the device. This is always
174 * 0 for regular block devices. conv_zones_bitmap is a bitmap of nr_zones
175 * bits which indicates if a zone is conventional (bit set) or
176 * sequential (bit clear). seq_zones_wlock is a bitmap of nr_zones
177 * bits which indicates if a zone is write locked, that is, if a write
178 * request targeting the zone was dispatched.
180 * Reads of this information must be protected with blk_queue_enter() /
181 * blk_queue_exit(). Modifying this information is only allowed while
182 * no requests are being processed. See also blk_mq_freeze_queue() and
183 * blk_mq_unfreeze_queue().
185 unsigned int nr_zones;
186 unsigned int max_open_zones;
187 unsigned int max_active_zones;
188 unsigned long *conv_zones_bitmap;
189 unsigned long *seq_zones_wlock;
190 #endif /* CONFIG_BLK_DEV_ZONED */
192 #if IS_ENABLED(CONFIG_CDROM)
193 struct cdrom_device_info *cdi;
196 struct badblocks *bb;
197 struct lockdep_map lockdep_map;
201 * Independent sector access ranges. This is always NULL for
202 * devices that do not have multiple independent access ranges.
204 struct blk_independent_access_ranges *ia_ranges;
207 static inline bool disk_live(struct gendisk *disk)
209 return !inode_unhashed(disk->part0->bd_inode);
213 * disk_openers - returns how many openers are there for a disk
214 * @disk: disk to check
216 * This returns the number of openers for a disk. Note that this value is only
217 * stable if disk->open_mutex is held.
219 * Note: Due to a quirk in the block layer open code, each open partition is
220 * only counted once even if there are multiple openers.
222 static inline unsigned int disk_openers(struct gendisk *disk)
224 return atomic_read(&disk->part0->bd_openers);
228 * The gendisk is refcounted by the part0 block_device, and the bd_device
229 * therein is also used for device model presentation in sysfs.
231 #define dev_to_disk(device) \
232 (dev_to_bdev(device)->bd_disk)
233 #define disk_to_dev(disk) \
234 (&((disk)->part0->bd_device))
236 #if IS_REACHABLE(CONFIG_CDROM)
237 #define disk_to_cdi(disk) ((disk)->cdi)
239 #define disk_to_cdi(disk) NULL
242 static inline dev_t disk_devt(struct gendisk *disk)
244 return MKDEV(disk->major, disk->first_minor);
247 static inline int blk_validate_block_size(unsigned long bsize)
249 if (bsize < 512 || bsize > PAGE_SIZE || !is_power_of_2(bsize))
255 static inline bool blk_op_is_passthrough(blk_opf_t op)
258 return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT;
262 * Zoned block device models (zoned limit).
264 * Note: This needs to be ordered from the least to the most severe
265 * restrictions for the inheritance in blk_stack_limits() to work.
267 enum blk_zoned_model {
268 BLK_ZONED_NONE = 0, /* Regular block device */
269 BLK_ZONED_HA, /* Host-aware zoned block device */
270 BLK_ZONED_HM, /* Host-managed zoned block device */
274 * BLK_BOUNCE_NONE: never bounce (default)
275 * BLK_BOUNCE_HIGH: bounce all highmem pages
282 struct queue_limits {
283 enum blk_bounce bounce;
284 unsigned long seg_boundary_mask;
285 unsigned long virt_boundary_mask;
287 unsigned int max_hw_sectors;
288 unsigned int max_dev_sectors;
289 unsigned int chunk_sectors;
290 unsigned int max_sectors;
291 unsigned int max_segment_size;
292 unsigned int physical_block_size;
293 unsigned int logical_block_size;
294 unsigned int alignment_offset;
297 unsigned int max_discard_sectors;
298 unsigned int max_hw_discard_sectors;
299 unsigned int max_secure_erase_sectors;
300 unsigned int max_write_zeroes_sectors;
301 unsigned int max_zone_append_sectors;
302 unsigned int discard_granularity;
303 unsigned int discard_alignment;
304 unsigned int zone_write_granularity;
306 unsigned short max_segments;
307 unsigned short max_integrity_segments;
308 unsigned short max_discard_segments;
310 unsigned char misaligned;
311 unsigned char discard_misaligned;
312 unsigned char raid_partial_stripes_expensive;
313 enum blk_zoned_model zoned;
316 typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx,
319 void disk_set_zoned(struct gendisk *disk, enum blk_zoned_model model);
321 #ifdef CONFIG_BLK_DEV_ZONED
323 #define BLK_ALL_ZONES ((unsigned int)-1)
324 int blkdev_report_zones(struct block_device *bdev, sector_t sector,
325 unsigned int nr_zones, report_zones_cb cb, void *data);
326 unsigned int bdev_nr_zones(struct block_device *bdev);
327 extern int blkdev_zone_mgmt(struct block_device *bdev, enum req_op op,
328 sector_t sectors, sector_t nr_sectors,
330 int blk_revalidate_disk_zones(struct gendisk *disk,
331 void (*update_driver_data)(struct gendisk *disk));
333 extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
334 unsigned int cmd, unsigned long arg);
335 extern int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode,
336 unsigned int cmd, unsigned long arg);
338 #else /* CONFIG_BLK_DEV_ZONED */
340 static inline unsigned int bdev_nr_zones(struct block_device *bdev)
345 static inline int blkdev_report_zones_ioctl(struct block_device *bdev,
346 fmode_t mode, unsigned int cmd,
352 static inline int blkdev_zone_mgmt_ioctl(struct block_device *bdev,
353 fmode_t mode, unsigned int cmd,
359 #endif /* CONFIG_BLK_DEV_ZONED */
362 * Independent access ranges: struct blk_independent_access_range describes
363 * a range of contiguous sectors that can be accessed using device command
364 * execution resources that are independent from the resources used for
365 * other access ranges. This is typically found with single-LUN multi-actuator
366 * HDDs where each access range is served by a different set of heads.
367 * The set of independent ranges supported by the device is defined using
368 * struct blk_independent_access_ranges. The independent ranges must not overlap
369 * and must include all sectors within the disk capacity (no sector holes
371 * For a device with multiple ranges, requests targeting sectors in different
372 * ranges can be executed in parallel. A request can straddle an access range
375 struct blk_independent_access_range {
381 struct blk_independent_access_ranges {
383 bool sysfs_registered;
384 unsigned int nr_ia_ranges;
385 struct blk_independent_access_range ia_range[];
388 struct request_queue {
389 struct request *last_merge;
390 struct elevator_queue *elevator;
392 struct percpu_ref q_usage_counter;
394 struct blk_queue_stats *stats;
395 struct rq_qos *rq_qos;
397 const struct blk_mq_ops *mq_ops;
400 struct blk_mq_ctx __percpu *queue_ctx;
402 unsigned int queue_depth;
404 /* hw dispatch queues */
405 struct xarray hctx_table;
406 unsigned int nr_hw_queues;
409 * The queue owner gets to use this for whatever they like.
410 * ll_rw_blk doesn't touch it.
415 * various queue flags, see QUEUE_* below
417 unsigned long queue_flags;
419 * Number of contexts that have called blk_set_pm_only(). If this
420 * counter is above zero then only RQF_PM requests are processed.
425 * ida allocated id for this queue. Used to index queues from
430 spinlock_t queue_lock;
432 struct gendisk *disk;
442 struct kobject *mq_kobj;
444 #ifdef CONFIG_BLK_DEV_INTEGRITY
445 struct blk_integrity integrity;
446 #endif /* CONFIG_BLK_DEV_INTEGRITY */
450 enum rpm_status rpm_status;
456 unsigned long nr_requests; /* Max # of requests */
458 unsigned int dma_pad_mask;
460 * Drivers that set dma_alignment to less than 511 must be prepared to
461 * handle individual bvec's that are not a multiple of a SECTOR_SIZE
462 * due to possible offsets.
464 unsigned int dma_alignment;
466 #ifdef CONFIG_BLK_INLINE_ENCRYPTION
467 struct blk_crypto_profile *crypto_profile;
468 struct kobject *crypto_kobject;
471 unsigned int rq_timeout;
474 struct blk_stat_callback *poll_cb;
475 struct blk_rq_stat *poll_stat;
477 struct timer_list timeout;
478 struct work_struct timeout_work;
480 atomic_t nr_active_requests_shared_tags;
482 struct blk_mq_tags *sched_shared_tags;
484 struct list_head icq_list;
485 #ifdef CONFIG_BLK_CGROUP
486 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
487 struct blkcg_gq *root_blkg;
488 struct list_head blkg_list;
491 struct queue_limits limits;
493 unsigned int required_elevator_features;
496 #ifdef CONFIG_BLK_DEV_IO_TRACE
497 struct blk_trace __rcu *blk_trace;
500 * for flush operations
502 struct blk_flush_queue *fq;
504 struct list_head requeue_list;
505 spinlock_t requeue_lock;
506 struct delayed_work requeue_work;
508 struct mutex sysfs_lock;
509 struct mutex sysfs_dir_lock;
512 * for reusing dead hctx instance in case of updating
515 struct list_head unused_hctx_list;
516 spinlock_t unused_hctx_lock;
520 #ifdef CONFIG_BLK_DEV_THROTTLING
522 struct throtl_data *td;
524 struct rcu_head rcu_head;
525 wait_queue_head_t mq_freeze_wq;
527 * Protect concurrent access to q_usage_counter by
528 * percpu_ref_kill() and percpu_ref_reinit().
530 struct mutex mq_freeze_lock;
534 struct blk_mq_tag_set *tag_set;
535 struct list_head tag_set_list;
537 struct dentry *debugfs_dir;
538 struct dentry *sched_debugfs_dir;
539 struct dentry *rqos_debugfs_dir;
541 * Serializes all debugfs metadata operations using the above dentries.
543 struct mutex debugfs_mutex;
545 bool mq_sysfs_init_done;
548 * @srcu: Sleepable RCU. Use as lock when type of the request queue
549 * is blocking (BLK_MQ_F_BLOCKING). Must be the last member
551 struct srcu_struct srcu[];
554 /* Keep blk_queue_flag_name[] in sync with the definitions below */
555 #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */
556 #define QUEUE_FLAG_DYING 1 /* queue being torn down */
557 #define QUEUE_FLAG_HAS_SRCU 2 /* SRCU is allocated */
558 #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */
559 #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */
560 #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */
561 #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */
562 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
563 #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */
564 #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */
565 #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */
566 #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */
567 #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */
568 #define QUEUE_FLAG_STABLE_WRITES 15 /* don't modify blks until WB is done */
569 #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */
570 #define QUEUE_FLAG_WC 17 /* Write back caching */
571 #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */
572 #define QUEUE_FLAG_DAX 19 /* device supports DAX */
573 #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */
574 #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */
575 #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */
576 #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */
577 #define QUEUE_FLAG_ZONE_RESETALL 26 /* supports Zone Reset All */
578 #define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */
579 #define QUEUE_FLAG_HCTX_ACTIVE 28 /* at least one blk-mq hctx is active */
580 #define QUEUE_FLAG_NOWAIT 29 /* device supports NOWAIT */
581 #define QUEUE_FLAG_SQ_SCHED 30 /* single queue style io dispatch */
583 #define QUEUE_FLAG_MQ_DEFAULT ((1UL << QUEUE_FLAG_IO_STAT) | \
584 (1UL << QUEUE_FLAG_SAME_COMP) | \
585 (1UL << QUEUE_FLAG_NOWAIT))
587 void blk_queue_flag_set(unsigned int flag, struct request_queue *q);
588 void blk_queue_flag_clear(unsigned int flag, struct request_queue *q);
589 bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
591 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
592 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
593 #define blk_queue_has_srcu(q) test_bit(QUEUE_FLAG_HAS_SRCU, &(q)->queue_flags)
594 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
595 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
596 #define blk_queue_noxmerges(q) \
597 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
598 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
599 #define blk_queue_stable_writes(q) \
600 test_bit(QUEUE_FLAG_STABLE_WRITES, &(q)->queue_flags)
601 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
602 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
603 #define blk_queue_zone_resetall(q) \
604 test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags)
605 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
606 #define blk_queue_pci_p2pdma(q) \
607 test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags)
608 #ifdef CONFIG_BLK_RQ_ALLOC_TIME
609 #define blk_queue_rq_alloc_time(q) \
610 test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags)
612 #define blk_queue_rq_alloc_time(q) false
615 #define blk_noretry_request(rq) \
616 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
617 REQ_FAILFAST_DRIVER))
618 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
619 #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only)
620 #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags)
621 #define blk_queue_sq_sched(q) test_bit(QUEUE_FLAG_SQ_SCHED, &(q)->queue_flags)
623 extern void blk_set_pm_only(struct request_queue *q);
624 extern void blk_clear_pm_only(struct request_queue *q);
626 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
628 #define dma_map_bvec(dev, bv, dir, attrs) \
629 dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \
632 static inline bool queue_is_mq(struct request_queue *q)
638 static inline enum rpm_status queue_rpm_status(struct request_queue *q)
640 return q->rpm_status;
643 static inline enum rpm_status queue_rpm_status(struct request_queue *q)
649 static inline enum blk_zoned_model
650 blk_queue_zoned_model(struct request_queue *q)
652 if (IS_ENABLED(CONFIG_BLK_DEV_ZONED))
653 return q->limits.zoned;
654 return BLK_ZONED_NONE;
657 static inline bool blk_queue_is_zoned(struct request_queue *q)
659 switch (blk_queue_zoned_model(q)) {
668 #ifdef CONFIG_BLK_DEV_ZONED
669 static inline unsigned int disk_nr_zones(struct gendisk *disk)
671 return blk_queue_is_zoned(disk->queue) ? disk->nr_zones : 0;
674 static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector)
676 if (!blk_queue_is_zoned(disk->queue))
678 return sector >> ilog2(disk->queue->limits.chunk_sectors);
681 static inline bool disk_zone_is_seq(struct gendisk *disk, sector_t sector)
683 if (!blk_queue_is_zoned(disk->queue))
685 if (!disk->conv_zones_bitmap)
687 return !test_bit(disk_zone_no(disk, sector), disk->conv_zones_bitmap);
690 static inline void disk_set_max_open_zones(struct gendisk *disk,
691 unsigned int max_open_zones)
693 disk->max_open_zones = max_open_zones;
696 static inline void disk_set_max_active_zones(struct gendisk *disk,
697 unsigned int max_active_zones)
699 disk->max_active_zones = max_active_zones;
702 static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
704 return bdev->bd_disk->max_open_zones;
707 static inline unsigned int bdev_max_active_zones(struct block_device *bdev)
709 return bdev->bd_disk->max_active_zones;
712 #else /* CONFIG_BLK_DEV_ZONED */
713 static inline unsigned int disk_nr_zones(struct gendisk *disk)
717 static inline bool disk_zone_is_seq(struct gendisk *disk, sector_t sector)
721 static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector)
725 static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
730 static inline unsigned int bdev_max_active_zones(struct block_device *bdev)
734 #endif /* CONFIG_BLK_DEV_ZONED */
736 static inline unsigned int blk_queue_depth(struct request_queue *q)
739 return q->queue_depth;
741 return q->nr_requests;
745 * default timeout for SG_IO if none specified
747 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
748 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
750 /* This should not be used directly - use rq_for_each_segment */
751 #define for_each_bio(_bio) \
752 for (; _bio; _bio = _bio->bi_next)
754 int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
755 const struct attribute_group **groups);
756 static inline int __must_check add_disk(struct gendisk *disk)
758 return device_add_disk(NULL, disk, NULL);
760 void del_gendisk(struct gendisk *gp);
761 void invalidate_disk(struct gendisk *disk);
762 void set_disk_ro(struct gendisk *disk, bool read_only);
763 void disk_uevent(struct gendisk *disk, enum kobject_action action);
765 static inline int get_disk_ro(struct gendisk *disk)
767 return disk->part0->bd_read_only ||
768 test_bit(GD_READ_ONLY, &disk->state);
771 static inline int bdev_read_only(struct block_device *bdev)
773 return bdev->bd_read_only || get_disk_ro(bdev->bd_disk);
776 bool set_capacity_and_notify(struct gendisk *disk, sector_t size);
777 bool disk_force_media_change(struct gendisk *disk, unsigned int events);
779 void add_disk_randomness(struct gendisk *disk) __latent_entropy;
780 void rand_initialize_disk(struct gendisk *disk);
782 static inline sector_t get_start_sect(struct block_device *bdev)
784 return bdev->bd_start_sect;
787 static inline sector_t bdev_nr_sectors(struct block_device *bdev)
789 return bdev->bd_nr_sectors;
792 static inline loff_t bdev_nr_bytes(struct block_device *bdev)
794 return (loff_t)bdev_nr_sectors(bdev) << SECTOR_SHIFT;
797 static inline sector_t get_capacity(struct gendisk *disk)
799 return bdev_nr_sectors(disk->part0);
802 static inline u64 sb_bdev_nr_blocks(struct super_block *sb)
804 return bdev_nr_sectors(sb->s_bdev) >>
805 (sb->s_blocksize_bits - SECTOR_SHIFT);
808 int bdev_disk_changed(struct gendisk *disk, bool invalidate);
810 void put_disk(struct gendisk *disk);
811 struct gendisk *__blk_alloc_disk(int node, struct lock_class_key *lkclass);
814 * blk_alloc_disk - allocate a gendisk structure
815 * @node_id: numa node to allocate on
817 * Allocate and pre-initialize a gendisk structure for use with BIO based
822 #define blk_alloc_disk(node_id) \
824 static struct lock_class_key __key; \
826 __blk_alloc_disk(node_id, &__key); \
829 int __register_blkdev(unsigned int major, const char *name,
830 void (*probe)(dev_t devt));
831 #define register_blkdev(major, name) \
832 __register_blkdev(major, name, NULL)
833 void unregister_blkdev(unsigned int major, const char *name);
835 bool bdev_check_media_change(struct block_device *bdev);
836 int __invalidate_device(struct block_device *bdev, bool kill_dirty);
837 void set_capacity(struct gendisk *disk, sector_t size);
839 #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED
840 int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
841 void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk);
842 int bd_register_pending_holders(struct gendisk *disk);
844 static inline int bd_link_disk_holder(struct block_device *bdev,
845 struct gendisk *disk)
849 static inline void bd_unlink_disk_holder(struct block_device *bdev,
850 struct gendisk *disk)
853 static inline int bd_register_pending_holders(struct gendisk *disk)
857 #endif /* CONFIG_BLOCK_HOLDER_DEPRECATED */
859 dev_t part_devt(struct gendisk *disk, u8 partno);
860 void inc_diskseq(struct gendisk *disk);
861 dev_t blk_lookup_devt(const char *name, int partno);
862 void blk_request_module(dev_t devt);
864 extern int blk_register_queue(struct gendisk *disk);
865 extern void blk_unregister_queue(struct gendisk *disk);
866 void submit_bio_noacct(struct bio *bio);
867 struct bio *bio_split_to_limits(struct bio *bio);
869 extern int blk_lld_busy(struct request_queue *q);
870 extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags);
871 extern void blk_queue_exit(struct request_queue *q);
872 extern void blk_sync_queue(struct request_queue *q);
874 /* Helper to convert REQ_OP_XXX to its string format XXX */
875 extern const char *blk_op_str(enum req_op op);
877 int blk_status_to_errno(blk_status_t status);
878 blk_status_t errno_to_blk_status(int errno);
880 /* only poll the hardware once, don't continue until a completion was found */
881 #define BLK_POLL_ONESHOT (1 << 0)
882 /* do not sleep to wait for the expected completion time */
883 #define BLK_POLL_NOSLEEP (1 << 1)
884 int bio_poll(struct bio *bio, struct io_comp_batch *iob, unsigned int flags);
885 int iocb_bio_iopoll(struct kiocb *kiocb, struct io_comp_batch *iob,
888 static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
890 return bdev->bd_queue; /* this is never NULL */
893 /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */
894 const char *blk_zone_cond_str(enum blk_zone_cond zone_cond);
896 static inline unsigned int bio_zone_no(struct bio *bio)
898 return disk_zone_no(bio->bi_bdev->bd_disk, bio->bi_iter.bi_sector);
901 static inline unsigned int bio_zone_is_seq(struct bio *bio)
903 return disk_zone_is_seq(bio->bi_bdev->bd_disk, bio->bi_iter.bi_sector);
907 * Return how much of the chunk is left to be used for I/O at a given offset.
909 static inline unsigned int blk_chunk_sectors_left(sector_t offset,
910 unsigned int chunk_sectors)
912 if (unlikely(!is_power_of_2(chunk_sectors)))
913 return chunk_sectors - sector_div(offset, chunk_sectors);
914 return chunk_sectors - (offset & (chunk_sectors - 1));
918 * Access functions for manipulating queue properties
920 void blk_queue_bounce_limit(struct request_queue *q, enum blk_bounce limit);
921 extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
922 extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
923 extern void blk_queue_max_segments(struct request_queue *, unsigned short);
924 extern void blk_queue_max_discard_segments(struct request_queue *,
926 void blk_queue_max_secure_erase_sectors(struct request_queue *q,
927 unsigned int max_sectors);
928 extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
929 extern void blk_queue_max_discard_sectors(struct request_queue *q,
930 unsigned int max_discard_sectors);
931 extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
932 unsigned int max_write_same_sectors);
933 extern void blk_queue_logical_block_size(struct request_queue *, unsigned int);
934 extern void blk_queue_max_zone_append_sectors(struct request_queue *q,
935 unsigned int max_zone_append_sectors);
936 extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
937 void blk_queue_zone_write_granularity(struct request_queue *q,
939 extern void blk_queue_alignment_offset(struct request_queue *q,
940 unsigned int alignment);
941 void disk_update_readahead(struct gendisk *disk);
942 extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
943 extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
944 extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
945 extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
946 extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
947 extern void blk_set_default_limits(struct queue_limits *lim);
948 extern void blk_set_stacking_limits(struct queue_limits *lim);
949 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
951 extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
953 extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
954 extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
955 extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
956 extern void blk_queue_dma_alignment(struct request_queue *, int);
957 extern void blk_queue_update_dma_alignment(struct request_queue *, 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);
967 * Elevator features for blk_queue_required_elevator_features:
969 /* Supports zoned block devices sequential write constraint */
970 #define ELEVATOR_F_ZBD_SEQ_WRITE (1U << 0)
972 extern void blk_queue_required_elevator_features(struct request_queue *q,
973 unsigned int features);
974 extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q,
977 bool __must_check blk_get_queue(struct request_queue *);
978 extern void blk_put_queue(struct request_queue *);
980 void blk_mark_disk_dead(struct gendisk *disk);
984 * blk_plug permits building a queue of related requests by holding the I/O
985 * fragments for a short period. This allows merging of sequential requests
986 * into single larger request. As the requests are moved from a per-task list to
987 * the device's request_queue in a batch, this results in improved scalability
988 * as the lock contention for request_queue lock is reduced.
990 * It is ok not to disable preemption when adding the request to the plug list
991 * or when attempting a merge. For details, please see schedule() where
992 * blk_flush_plug() is called.
995 struct request *mq_list; /* blk-mq requests */
997 /* if ios_left is > 1, we can batch tag/rq allocations */
998 struct request *cached_rq;
999 unsigned short nr_ios;
1001 unsigned short rq_count;
1003 bool multiple_queues;
1007 struct list_head cb_list; /* md requires an unplug callback */
1011 typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
1012 struct blk_plug_cb {
1013 struct list_head list;
1014 blk_plug_cb_fn callback;
1017 extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
1018 void *data, int size);
1019 extern void blk_start_plug(struct blk_plug *);
1020 extern void blk_start_plug_nr_ios(struct blk_plug *, unsigned short);
1021 extern void blk_finish_plug(struct blk_plug *);
1023 void __blk_flush_plug(struct blk_plug *plug, bool from_schedule);
1024 static inline void blk_flush_plug(struct blk_plug *plug, bool async)
1027 __blk_flush_plug(plug, async);
1030 int blkdev_issue_flush(struct block_device *bdev);
1031 long nr_blockdev_pages(void);
1032 #else /* CONFIG_BLOCK */
1036 static inline void blk_start_plug_nr_ios(struct blk_plug *plug,
1037 unsigned short nr_ios)
1041 static inline void blk_start_plug(struct blk_plug *plug)
1045 static inline void blk_finish_plug(struct blk_plug *plug)
1049 static inline void blk_flush_plug(struct blk_plug *plug, bool async)
1053 static inline int blkdev_issue_flush(struct block_device *bdev)
1058 static inline long nr_blockdev_pages(void)
1062 #endif /* CONFIG_BLOCK */
1064 extern void blk_io_schedule(void);
1066 int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1067 sector_t nr_sects, gfp_t gfp_mask);
1068 int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1069 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop);
1070 int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector,
1071 sector_t nr_sects, gfp_t gfp);
1073 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
1074 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
1076 extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1077 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
1079 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1080 sector_t nr_sects, gfp_t gfp_mask, unsigned flags);
1082 static inline int sb_issue_discard(struct super_block *sb, sector_t block,
1083 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
1085 return blkdev_issue_discard(sb->s_bdev,
1086 block << (sb->s_blocksize_bits -
1088 nr_blocks << (sb->s_blocksize_bits -
1092 static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
1093 sector_t nr_blocks, gfp_t gfp_mask)
1095 return blkdev_issue_zeroout(sb->s_bdev,
1096 block << (sb->s_blocksize_bits -
1098 nr_blocks << (sb->s_blocksize_bits -
1103 static inline bool bdev_is_partition(struct block_device *bdev)
1105 return bdev->bd_partno;
1108 enum blk_default_limits {
1109 BLK_MAX_SEGMENTS = 128,
1110 BLK_SAFE_MAX_SECTORS = 255,
1111 BLK_DEF_MAX_SECTORS = 2560,
1112 BLK_MAX_SEGMENT_SIZE = 65536,
1113 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
1116 static inline unsigned long queue_segment_boundary(const struct request_queue *q)
1118 return q->limits.seg_boundary_mask;
1121 static inline unsigned long queue_virt_boundary(const struct request_queue *q)
1123 return q->limits.virt_boundary_mask;
1126 static inline unsigned int queue_max_sectors(const struct request_queue *q)
1128 return q->limits.max_sectors;
1131 static inline unsigned int queue_max_bytes(struct request_queue *q)
1133 return min_t(unsigned int, queue_max_sectors(q), INT_MAX >> 9) << 9;
1136 static inline unsigned int queue_max_hw_sectors(const struct request_queue *q)
1138 return q->limits.max_hw_sectors;
1141 static inline unsigned short queue_max_segments(const struct request_queue *q)
1143 return q->limits.max_segments;
1146 static inline unsigned short queue_max_discard_segments(const struct request_queue *q)
1148 return q->limits.max_discard_segments;
1151 static inline unsigned int queue_max_segment_size(const struct request_queue *q)
1153 return q->limits.max_segment_size;
1156 static inline unsigned int queue_max_zone_append_sectors(const struct request_queue *q)
1159 const struct queue_limits *l = &q->limits;
1161 return min(l->max_zone_append_sectors, l->max_sectors);
1164 static inline unsigned int
1165 bdev_max_zone_append_sectors(struct block_device *bdev)
1167 return queue_max_zone_append_sectors(bdev_get_queue(bdev));
1170 static inline unsigned int bdev_max_segments(struct block_device *bdev)
1172 return queue_max_segments(bdev_get_queue(bdev));
1175 static inline unsigned queue_logical_block_size(const struct request_queue *q)
1179 if (q && q->limits.logical_block_size)
1180 retval = q->limits.logical_block_size;
1185 static inline unsigned int bdev_logical_block_size(struct block_device *bdev)
1187 return queue_logical_block_size(bdev_get_queue(bdev));
1190 static inline unsigned int queue_physical_block_size(const struct request_queue *q)
1192 return q->limits.physical_block_size;
1195 static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
1197 return queue_physical_block_size(bdev_get_queue(bdev));
1200 static inline unsigned int queue_io_min(const struct request_queue *q)
1202 return q->limits.io_min;
1205 static inline int bdev_io_min(struct block_device *bdev)
1207 return queue_io_min(bdev_get_queue(bdev));
1210 static inline unsigned int queue_io_opt(const struct request_queue *q)
1212 return q->limits.io_opt;
1215 static inline int bdev_io_opt(struct block_device *bdev)
1217 return queue_io_opt(bdev_get_queue(bdev));
1220 static inline unsigned int
1221 queue_zone_write_granularity(const struct request_queue *q)
1223 return q->limits.zone_write_granularity;
1226 static inline unsigned int
1227 bdev_zone_write_granularity(struct block_device *bdev)
1229 return queue_zone_write_granularity(bdev_get_queue(bdev));
1232 int bdev_alignment_offset(struct block_device *bdev);
1233 unsigned int bdev_discard_alignment(struct block_device *bdev);
1235 static inline unsigned int bdev_max_discard_sectors(struct block_device *bdev)
1237 return bdev_get_queue(bdev)->limits.max_discard_sectors;
1240 static inline unsigned int bdev_discard_granularity(struct block_device *bdev)
1242 return bdev_get_queue(bdev)->limits.discard_granularity;
1245 static inline unsigned int
1246 bdev_max_secure_erase_sectors(struct block_device *bdev)
1248 return bdev_get_queue(bdev)->limits.max_secure_erase_sectors;
1251 static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
1253 struct request_queue *q = bdev_get_queue(bdev);
1256 return q->limits.max_write_zeroes_sectors;
1261 static inline bool bdev_nonrot(struct block_device *bdev)
1263 return blk_queue_nonrot(bdev_get_queue(bdev));
1266 static inline bool bdev_stable_writes(struct block_device *bdev)
1268 return test_bit(QUEUE_FLAG_STABLE_WRITES,
1269 &bdev_get_queue(bdev)->queue_flags);
1272 static inline bool bdev_write_cache(struct block_device *bdev)
1274 return test_bit(QUEUE_FLAG_WC, &bdev_get_queue(bdev)->queue_flags);
1277 static inline bool bdev_fua(struct block_device *bdev)
1279 return test_bit(QUEUE_FLAG_FUA, &bdev_get_queue(bdev)->queue_flags);
1282 static inline bool bdev_nowait(struct block_device *bdev)
1284 return test_bit(QUEUE_FLAG_NOWAIT, &bdev_get_queue(bdev)->queue_flags);
1287 static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev)
1289 struct request_queue *q = bdev_get_queue(bdev);
1292 return blk_queue_zoned_model(q);
1294 return BLK_ZONED_NONE;
1297 static inline bool bdev_is_zoned(struct block_device *bdev)
1299 struct request_queue *q = bdev_get_queue(bdev);
1302 return blk_queue_is_zoned(q);
1307 static inline bool bdev_op_is_zoned_write(struct block_device *bdev,
1310 if (!bdev_is_zoned(bdev))
1313 return op == REQ_OP_WRITE || op == REQ_OP_WRITE_ZEROES;
1316 static inline sector_t bdev_zone_sectors(struct block_device *bdev)
1318 struct request_queue *q = bdev_get_queue(bdev);
1320 if (!blk_queue_is_zoned(q))
1322 return q->limits.chunk_sectors;
1325 static inline int queue_dma_alignment(const struct request_queue *q)
1327 return q ? q->dma_alignment : 511;
1330 static inline unsigned int bdev_dma_alignment(struct block_device *bdev)
1332 return queue_dma_alignment(bdev_get_queue(bdev));
1335 static inline bool bdev_iter_is_aligned(struct block_device *bdev,
1336 struct iov_iter *iter)
1338 return iov_iter_is_aligned(iter, bdev_dma_alignment(bdev),
1339 bdev_logical_block_size(bdev) - 1);
1342 static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
1345 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
1346 return !(addr & alignment) && !(len & alignment);
1349 /* assumes size > 256 */
1350 static inline unsigned int blksize_bits(unsigned int size)
1352 unsigned int bits = 8;
1356 } while (size > 256);
1360 static inline unsigned int block_size(struct block_device *bdev)
1362 return 1 << bdev->bd_inode->i_blkbits;
1365 int kblockd_schedule_work(struct work_struct *work);
1366 int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
1368 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1369 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1370 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1371 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1373 #ifdef CONFIG_BLK_INLINE_ENCRYPTION
1375 bool blk_crypto_register(struct blk_crypto_profile *profile,
1376 struct request_queue *q);
1378 #else /* CONFIG_BLK_INLINE_ENCRYPTION */
1380 static inline bool blk_crypto_register(struct blk_crypto_profile *profile,
1381 struct request_queue *q)
1386 #endif /* CONFIG_BLK_INLINE_ENCRYPTION */
1388 enum blk_unique_id {
1389 /* these match the Designator Types specified in SPC */
1395 #define NFL4_UFLG_MASK 0x0000003F
1397 struct block_device_operations {
1398 void (*submit_bio)(struct bio *bio);
1399 int (*poll_bio)(struct bio *bio, struct io_comp_batch *iob,
1400 unsigned int flags);
1401 int (*open) (struct block_device *, fmode_t);
1402 void (*release) (struct gendisk *, fmode_t);
1403 int (*rw_page)(struct block_device *, sector_t, struct page *, enum req_op);
1404 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1405 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1406 unsigned int (*check_events) (struct gendisk *disk,
1407 unsigned int clearing);
1408 void (*unlock_native_capacity) (struct gendisk *);
1409 int (*getgeo)(struct block_device *, struct hd_geometry *);
1410 int (*set_read_only)(struct block_device *bdev, bool ro);
1411 void (*free_disk)(struct gendisk *disk);
1412 /* this callback is with swap_lock and sometimes page table lock held */
1413 void (*swap_slot_free_notify) (struct block_device *, unsigned long);
1414 int (*report_zones)(struct gendisk *, sector_t sector,
1415 unsigned int nr_zones, report_zones_cb cb, void *data);
1416 char *(*devnode)(struct gendisk *disk, umode_t *mode);
1417 /* returns the length of the identifier or a negative errno: */
1418 int (*get_unique_id)(struct gendisk *disk, u8 id[16],
1419 enum blk_unique_id id_type);
1420 struct module *owner;
1421 const struct pr_ops *pr_ops;
1424 * Special callback for probing GPT entry at a given sector.
1425 * Needed by Android devices, used by GPT scanner and MMC blk
1428 int (*alternative_gpt_sector)(struct gendisk *disk, sector_t *sector);
1431 #ifdef CONFIG_COMPAT
1432 extern int blkdev_compat_ptr_ioctl(struct block_device *, fmode_t,
1433 unsigned int, unsigned long);
1435 #define blkdev_compat_ptr_ioctl NULL
1438 extern int bdev_read_page(struct block_device *, sector_t, struct page *);
1439 extern int bdev_write_page(struct block_device *, sector_t, struct page *,
1440 struct writeback_control *);
1442 static inline void blk_wake_io_task(struct task_struct *waiter)
1445 * If we're polling, the task itself is doing the completions. For
1446 * that case, we don't need to signal a wakeup, it's enough to just
1447 * mark us as RUNNING.
1449 if (waiter == current)
1450 __set_current_state(TASK_RUNNING);
1452 wake_up_process(waiter);
1455 unsigned long bdev_start_io_acct(struct block_device *bdev,
1456 unsigned int sectors, enum req_op op,
1457 unsigned long start_time);
1458 void bdev_end_io_acct(struct block_device *bdev, enum req_op op,
1459 unsigned long start_time);
1461 void bio_start_io_acct_time(struct bio *bio, unsigned long start_time);
1462 unsigned long bio_start_io_acct(struct bio *bio);
1463 void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time,
1464 struct block_device *orig_bdev);
1467 * bio_end_io_acct - end I/O accounting for bio based drivers
1468 * @bio: bio to end account for
1469 * @start_time: start time returned by bio_start_io_acct()
1471 static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time)
1473 return bio_end_io_acct_remapped(bio, start_time, bio->bi_bdev);
1476 int bdev_read_only(struct block_device *bdev);
1477 int set_blocksize(struct block_device *bdev, int size);
1479 int lookup_bdev(const char *pathname, dev_t *dev);
1481 void blkdev_show(struct seq_file *seqf, off_t offset);
1483 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1484 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
1486 #define BLKDEV_MAJOR_MAX 512
1488 #define BLKDEV_MAJOR_MAX 0
1491 struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
1493 struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder);
1494 int bd_prepare_to_claim(struct block_device *bdev, void *holder);
1495 void bd_abort_claiming(struct block_device *bdev, void *holder);
1496 void blkdev_put(struct block_device *bdev, fmode_t mode);
1498 /* just for blk-cgroup, don't use elsewhere */
1499 struct block_device *blkdev_get_no_open(dev_t dev);
1500 void blkdev_put_no_open(struct block_device *bdev);
1502 struct block_device *bdev_alloc(struct gendisk *disk, u8 partno);
1503 void bdev_add(struct block_device *bdev, dev_t dev);
1504 struct block_device *I_BDEV(struct inode *inode);
1505 int truncate_bdev_range(struct block_device *bdev, fmode_t mode, loff_t lstart,
1509 void invalidate_bdev(struct block_device *bdev);
1510 int sync_blockdev(struct block_device *bdev);
1511 int sync_blockdev_range(struct block_device *bdev, loff_t lstart, loff_t lend);
1512 int sync_blockdev_nowait(struct block_device *bdev);
1513 void sync_bdevs(bool wait);
1514 void bdev_statx_dioalign(struct inode *inode, struct kstat *stat);
1515 void printk_all_partitions(void);
1517 static inline void invalidate_bdev(struct block_device *bdev)
1520 static inline int sync_blockdev(struct block_device *bdev)
1524 static inline int sync_blockdev_nowait(struct block_device *bdev)
1528 static inline void sync_bdevs(bool wait)
1531 static inline void bdev_statx_dioalign(struct inode *inode, struct kstat *stat)
1534 static inline void printk_all_partitions(void)
1537 #endif /* CONFIG_BLOCK */
1539 int fsync_bdev(struct block_device *bdev);
1541 int freeze_bdev(struct block_device *bdev);
1542 int thaw_bdev(struct block_device *bdev);
1544 struct io_comp_batch {
1545 struct request *req_list;
1547 void (*complete)(struct io_comp_batch *);
1550 #define DEFINE_IO_COMP_BATCH(name) struct io_comp_batch name = { }
1552 #endif /* _LINUX_BLKDEV_H */