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 ((1 << QUEUE_FLAG_IO_STAT) | \
584 (1 << QUEUE_FLAG_SAME_COMP) | \
585 (1 << 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_nowait(q) test_bit(QUEUE_FLAG_NOWAIT, &(q)->queue_flags)
622 #define blk_queue_sq_sched(q) test_bit(QUEUE_FLAG_SQ_SCHED, &(q)->queue_flags)
624 extern void blk_set_pm_only(struct request_queue *q);
625 extern void blk_clear_pm_only(struct request_queue *q);
627 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
629 #define dma_map_bvec(dev, bv, dir, attrs) \
630 dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \
633 static inline bool queue_is_mq(struct request_queue *q)
639 static inline enum rpm_status queue_rpm_status(struct request_queue *q)
641 return q->rpm_status;
644 static inline enum rpm_status queue_rpm_status(struct request_queue *q)
650 static inline enum blk_zoned_model
651 blk_queue_zoned_model(struct request_queue *q)
653 if (IS_ENABLED(CONFIG_BLK_DEV_ZONED))
654 return q->limits.zoned;
655 return BLK_ZONED_NONE;
658 static inline bool blk_queue_is_zoned(struct request_queue *q)
660 switch (blk_queue_zoned_model(q)) {
669 #ifdef CONFIG_BLK_DEV_ZONED
670 static inline unsigned int disk_nr_zones(struct gendisk *disk)
672 return blk_queue_is_zoned(disk->queue) ? disk->nr_zones : 0;
675 static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector)
677 if (!blk_queue_is_zoned(disk->queue))
679 return sector >> ilog2(disk->queue->limits.chunk_sectors);
682 static inline bool disk_zone_is_seq(struct gendisk *disk, sector_t sector)
684 if (!blk_queue_is_zoned(disk->queue))
686 if (!disk->conv_zones_bitmap)
688 return !test_bit(disk_zone_no(disk, sector), disk->conv_zones_bitmap);
691 static inline void disk_set_max_open_zones(struct gendisk *disk,
692 unsigned int max_open_zones)
694 disk->max_open_zones = max_open_zones;
697 static inline void disk_set_max_active_zones(struct gendisk *disk,
698 unsigned int max_active_zones)
700 disk->max_active_zones = max_active_zones;
703 static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
705 return bdev->bd_disk->max_open_zones;
708 static inline unsigned int bdev_max_active_zones(struct block_device *bdev)
710 return bdev->bd_disk->max_active_zones;
713 #else /* CONFIG_BLK_DEV_ZONED */
714 static inline unsigned int disk_nr_zones(struct gendisk *disk)
718 static inline bool disk_zone_is_seq(struct gendisk *disk, sector_t sector)
722 static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector)
726 static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
731 static inline unsigned int bdev_max_active_zones(struct block_device *bdev)
735 #endif /* CONFIG_BLK_DEV_ZONED */
737 static inline unsigned int blk_queue_depth(struct request_queue *q)
740 return q->queue_depth;
742 return q->nr_requests;
746 * default timeout for SG_IO if none specified
748 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
749 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
751 /* This should not be used directly - use rq_for_each_segment */
752 #define for_each_bio(_bio) \
753 for (; _bio; _bio = _bio->bi_next)
755 int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
756 const struct attribute_group **groups);
757 static inline int __must_check add_disk(struct gendisk *disk)
759 return device_add_disk(NULL, disk, NULL);
761 void del_gendisk(struct gendisk *gp);
762 void invalidate_disk(struct gendisk *disk);
763 void set_disk_ro(struct gendisk *disk, bool read_only);
764 void disk_uevent(struct gendisk *disk, enum kobject_action action);
766 static inline int get_disk_ro(struct gendisk *disk)
768 return disk->part0->bd_read_only ||
769 test_bit(GD_READ_ONLY, &disk->state);
772 static inline int bdev_read_only(struct block_device *bdev)
774 return bdev->bd_read_only || get_disk_ro(bdev->bd_disk);
777 bool set_capacity_and_notify(struct gendisk *disk, sector_t size);
778 bool disk_force_media_change(struct gendisk *disk, unsigned int events);
780 void add_disk_randomness(struct gendisk *disk) __latent_entropy;
781 void rand_initialize_disk(struct gendisk *disk);
783 static inline sector_t get_start_sect(struct block_device *bdev)
785 return bdev->bd_start_sect;
788 static inline sector_t bdev_nr_sectors(struct block_device *bdev)
790 return bdev->bd_nr_sectors;
793 static inline loff_t bdev_nr_bytes(struct block_device *bdev)
795 return (loff_t)bdev_nr_sectors(bdev) << SECTOR_SHIFT;
798 static inline sector_t get_capacity(struct gendisk *disk)
800 return bdev_nr_sectors(disk->part0);
803 static inline u64 sb_bdev_nr_blocks(struct super_block *sb)
805 return bdev_nr_sectors(sb->s_bdev) >>
806 (sb->s_blocksize_bits - SECTOR_SHIFT);
809 int bdev_disk_changed(struct gendisk *disk, bool invalidate);
811 void put_disk(struct gendisk *disk);
812 struct gendisk *__blk_alloc_disk(int node, struct lock_class_key *lkclass);
815 * blk_alloc_disk - allocate a gendisk structure
816 * @node_id: numa node to allocate on
818 * Allocate and pre-initialize a gendisk structure for use with BIO based
823 #define blk_alloc_disk(node_id) \
825 static struct lock_class_key __key; \
827 __blk_alloc_disk(node_id, &__key); \
830 int __register_blkdev(unsigned int major, const char *name,
831 void (*probe)(dev_t devt));
832 #define register_blkdev(major, name) \
833 __register_blkdev(major, name, NULL)
834 void unregister_blkdev(unsigned int major, const char *name);
836 bool bdev_check_media_change(struct block_device *bdev);
837 int __invalidate_device(struct block_device *bdev, bool kill_dirty);
838 void set_capacity(struct gendisk *disk, sector_t size);
840 #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED
841 int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
842 void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk);
843 int bd_register_pending_holders(struct gendisk *disk);
845 static inline int bd_link_disk_holder(struct block_device *bdev,
846 struct gendisk *disk)
850 static inline void bd_unlink_disk_holder(struct block_device *bdev,
851 struct gendisk *disk)
854 static inline int bd_register_pending_holders(struct gendisk *disk)
858 #endif /* CONFIG_BLOCK_HOLDER_DEPRECATED */
860 dev_t part_devt(struct gendisk *disk, u8 partno);
861 void inc_diskseq(struct gendisk *disk);
862 dev_t blk_lookup_devt(const char *name, int partno);
863 void blk_request_module(dev_t devt);
865 extern int blk_register_queue(struct gendisk *disk);
866 extern void blk_unregister_queue(struct gendisk *disk);
867 void submit_bio_noacct(struct bio *bio);
868 struct bio *bio_split_to_limits(struct bio *bio);
870 extern int blk_lld_busy(struct request_queue *q);
871 extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags);
872 extern void blk_queue_exit(struct request_queue *q);
873 extern void blk_sync_queue(struct request_queue *q);
875 /* Helper to convert REQ_OP_XXX to its string format XXX */
876 extern const char *blk_op_str(enum req_op op);
878 int blk_status_to_errno(blk_status_t status);
879 blk_status_t errno_to_blk_status(int errno);
881 /* only poll the hardware once, don't continue until a completion was found */
882 #define BLK_POLL_ONESHOT (1 << 0)
883 /* do not sleep to wait for the expected completion time */
884 #define BLK_POLL_NOSLEEP (1 << 1)
885 int bio_poll(struct bio *bio, struct io_comp_batch *iob, unsigned int flags);
886 int iocb_bio_iopoll(struct kiocb *kiocb, struct io_comp_batch *iob,
889 static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
891 return bdev->bd_queue; /* this is never NULL */
894 /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */
895 const char *blk_zone_cond_str(enum blk_zone_cond zone_cond);
897 static inline unsigned int bio_zone_no(struct bio *bio)
899 return disk_zone_no(bio->bi_bdev->bd_disk, bio->bi_iter.bi_sector);
902 static inline unsigned int bio_zone_is_seq(struct bio *bio)
904 return disk_zone_is_seq(bio->bi_bdev->bd_disk, bio->bi_iter.bi_sector);
908 * Return how much of the chunk is left to be used for I/O at a given offset.
910 static inline unsigned int blk_chunk_sectors_left(sector_t offset,
911 unsigned int chunk_sectors)
913 if (unlikely(!is_power_of_2(chunk_sectors)))
914 return chunk_sectors - sector_div(offset, chunk_sectors);
915 return chunk_sectors - (offset & (chunk_sectors - 1));
919 * Access functions for manipulating queue properties
921 void blk_queue_bounce_limit(struct request_queue *q, enum blk_bounce limit);
922 extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
923 extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
924 extern void blk_queue_max_segments(struct request_queue *, unsigned short);
925 extern void blk_queue_max_discard_segments(struct request_queue *,
927 void blk_queue_max_secure_erase_sectors(struct request_queue *q,
928 unsigned int max_sectors);
929 extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
930 extern void blk_queue_max_discard_sectors(struct request_queue *q,
931 unsigned int max_discard_sectors);
932 extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
933 unsigned int max_write_same_sectors);
934 extern void blk_queue_logical_block_size(struct request_queue *, unsigned int);
935 extern void blk_queue_max_zone_append_sectors(struct request_queue *q,
936 unsigned int max_zone_append_sectors);
937 extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
938 void blk_queue_zone_write_granularity(struct request_queue *q,
940 extern void blk_queue_alignment_offset(struct request_queue *q,
941 unsigned int alignment);
942 void disk_update_readahead(struct gendisk *disk);
943 extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
944 extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
945 extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
946 extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
947 extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
948 extern void blk_set_default_limits(struct queue_limits *lim);
949 extern void blk_set_stacking_limits(struct queue_limits *lim);
950 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
952 extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
954 extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
955 extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
956 extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
957 extern void blk_queue_dma_alignment(struct request_queue *, int);
958 extern void blk_queue_update_dma_alignment(struct request_queue *, int);
959 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
960 extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
962 struct blk_independent_access_ranges *
963 disk_alloc_independent_access_ranges(struct gendisk *disk, int nr_ia_ranges);
964 void disk_set_independent_access_ranges(struct gendisk *disk,
965 struct blk_independent_access_ranges *iars);
968 * Elevator features for blk_queue_required_elevator_features:
970 /* Supports zoned block devices sequential write constraint */
971 #define ELEVATOR_F_ZBD_SEQ_WRITE (1U << 0)
973 extern void blk_queue_required_elevator_features(struct request_queue *q,
974 unsigned int features);
975 extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q,
978 bool __must_check blk_get_queue(struct request_queue *);
979 extern void blk_put_queue(struct request_queue *);
981 void blk_mark_disk_dead(struct gendisk *disk);
985 * blk_plug permits building a queue of related requests by holding the I/O
986 * fragments for a short period. This allows merging of sequential requests
987 * into single larger request. As the requests are moved from a per-task list to
988 * the device's request_queue in a batch, this results in improved scalability
989 * as the lock contention for request_queue lock is reduced.
991 * It is ok not to disable preemption when adding the request to the plug list
992 * or when attempting a merge. For details, please see schedule() where
993 * blk_flush_plug() is called.
996 struct request *mq_list; /* blk-mq requests */
998 /* if ios_left is > 1, we can batch tag/rq allocations */
999 struct request *cached_rq;
1000 unsigned short nr_ios;
1002 unsigned short rq_count;
1004 bool multiple_queues;
1008 struct list_head cb_list; /* md requires an unplug callback */
1012 typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
1013 struct blk_plug_cb {
1014 struct list_head list;
1015 blk_plug_cb_fn callback;
1018 extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
1019 void *data, int size);
1020 extern void blk_start_plug(struct blk_plug *);
1021 extern void blk_start_plug_nr_ios(struct blk_plug *, unsigned short);
1022 extern void blk_finish_plug(struct blk_plug *);
1024 void __blk_flush_plug(struct blk_plug *plug, bool from_schedule);
1025 static inline void blk_flush_plug(struct blk_plug *plug, bool async)
1028 __blk_flush_plug(plug, async);
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 int blkdev_issue_flush(struct block_device *bdev)
1059 static inline long nr_blockdev_pages(void)
1063 #endif /* CONFIG_BLOCK */
1065 extern void blk_io_schedule(void);
1067 int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1068 sector_t nr_sects, gfp_t gfp_mask);
1069 int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1070 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop);
1071 int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector,
1072 sector_t nr_sects, gfp_t gfp);
1074 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
1075 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
1077 extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1078 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
1080 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1081 sector_t nr_sects, gfp_t gfp_mask, unsigned flags);
1083 static inline int sb_issue_discard(struct super_block *sb, sector_t block,
1084 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
1086 return blkdev_issue_discard(sb->s_bdev,
1087 block << (sb->s_blocksize_bits -
1089 nr_blocks << (sb->s_blocksize_bits -
1093 static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
1094 sector_t nr_blocks, gfp_t gfp_mask)
1096 return blkdev_issue_zeroout(sb->s_bdev,
1097 block << (sb->s_blocksize_bits -
1099 nr_blocks << (sb->s_blocksize_bits -
1104 static inline bool bdev_is_partition(struct block_device *bdev)
1106 return bdev->bd_partno;
1109 enum blk_default_limits {
1110 BLK_MAX_SEGMENTS = 128,
1111 BLK_SAFE_MAX_SECTORS = 255,
1112 BLK_DEF_MAX_SECTORS = 2560,
1113 BLK_MAX_SEGMENT_SIZE = 65536,
1114 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
1117 static inline unsigned long queue_segment_boundary(const struct request_queue *q)
1119 return q->limits.seg_boundary_mask;
1122 static inline unsigned long queue_virt_boundary(const struct request_queue *q)
1124 return q->limits.virt_boundary_mask;
1127 static inline unsigned int queue_max_sectors(const struct request_queue *q)
1129 return q->limits.max_sectors;
1132 static inline unsigned int queue_max_bytes(struct request_queue *q)
1134 return min_t(unsigned int, queue_max_sectors(q), INT_MAX >> 9) << 9;
1137 static inline unsigned int queue_max_hw_sectors(const struct request_queue *q)
1139 return q->limits.max_hw_sectors;
1142 static inline unsigned short queue_max_segments(const struct request_queue *q)
1144 return q->limits.max_segments;
1147 static inline unsigned short queue_max_discard_segments(const struct request_queue *q)
1149 return q->limits.max_discard_segments;
1152 static inline unsigned int queue_max_segment_size(const struct request_queue *q)
1154 return q->limits.max_segment_size;
1157 static inline unsigned int queue_max_zone_append_sectors(const struct request_queue *q)
1160 const struct queue_limits *l = &q->limits;
1162 return min(l->max_zone_append_sectors, l->max_sectors);
1165 static inline unsigned int
1166 bdev_max_zone_append_sectors(struct block_device *bdev)
1168 return queue_max_zone_append_sectors(bdev_get_queue(bdev));
1171 static inline unsigned int bdev_max_segments(struct block_device *bdev)
1173 return queue_max_segments(bdev_get_queue(bdev));
1176 static inline unsigned queue_logical_block_size(const struct request_queue *q)
1180 if (q && q->limits.logical_block_size)
1181 retval = q->limits.logical_block_size;
1186 static inline unsigned int bdev_logical_block_size(struct block_device *bdev)
1188 return queue_logical_block_size(bdev_get_queue(bdev));
1191 static inline unsigned int queue_physical_block_size(const struct request_queue *q)
1193 return q->limits.physical_block_size;
1196 static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
1198 return queue_physical_block_size(bdev_get_queue(bdev));
1201 static inline unsigned int queue_io_min(const struct request_queue *q)
1203 return q->limits.io_min;
1206 static inline int bdev_io_min(struct block_device *bdev)
1208 return queue_io_min(bdev_get_queue(bdev));
1211 static inline unsigned int queue_io_opt(const struct request_queue *q)
1213 return q->limits.io_opt;
1216 static inline int bdev_io_opt(struct block_device *bdev)
1218 return queue_io_opt(bdev_get_queue(bdev));
1221 static inline unsigned int
1222 queue_zone_write_granularity(const struct request_queue *q)
1224 return q->limits.zone_write_granularity;
1227 static inline unsigned int
1228 bdev_zone_write_granularity(struct block_device *bdev)
1230 return queue_zone_write_granularity(bdev_get_queue(bdev));
1233 int bdev_alignment_offset(struct block_device *bdev);
1234 unsigned int bdev_discard_alignment(struct block_device *bdev);
1236 static inline unsigned int bdev_max_discard_sectors(struct block_device *bdev)
1238 return bdev_get_queue(bdev)->limits.max_discard_sectors;
1241 static inline unsigned int bdev_discard_granularity(struct block_device *bdev)
1243 return bdev_get_queue(bdev)->limits.discard_granularity;
1246 static inline unsigned int
1247 bdev_max_secure_erase_sectors(struct block_device *bdev)
1249 return bdev_get_queue(bdev)->limits.max_secure_erase_sectors;
1252 static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
1254 struct request_queue *q = bdev_get_queue(bdev);
1257 return q->limits.max_write_zeroes_sectors;
1262 static inline bool bdev_nonrot(struct block_device *bdev)
1264 return blk_queue_nonrot(bdev_get_queue(bdev));
1267 static inline bool bdev_stable_writes(struct block_device *bdev)
1269 return test_bit(QUEUE_FLAG_STABLE_WRITES,
1270 &bdev_get_queue(bdev)->queue_flags);
1273 static inline bool bdev_write_cache(struct block_device *bdev)
1275 return test_bit(QUEUE_FLAG_WC, &bdev_get_queue(bdev)->queue_flags);
1278 static inline bool bdev_fua(struct block_device *bdev)
1280 return test_bit(QUEUE_FLAG_FUA, &bdev_get_queue(bdev)->queue_flags);
1283 static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev)
1285 struct request_queue *q = bdev_get_queue(bdev);
1288 return blk_queue_zoned_model(q);
1290 return BLK_ZONED_NONE;
1293 static inline bool bdev_is_zoned(struct block_device *bdev)
1295 struct request_queue *q = bdev_get_queue(bdev);
1298 return blk_queue_is_zoned(q);
1303 static inline sector_t bdev_zone_sectors(struct block_device *bdev)
1305 struct request_queue *q = bdev_get_queue(bdev);
1307 if (!blk_queue_is_zoned(q))
1309 return q->limits.chunk_sectors;
1312 static inline int queue_dma_alignment(const struct request_queue *q)
1314 return q ? q->dma_alignment : 511;
1317 static inline unsigned int bdev_dma_alignment(struct block_device *bdev)
1319 return queue_dma_alignment(bdev_get_queue(bdev));
1322 static inline bool bdev_iter_is_aligned(struct block_device *bdev,
1323 struct iov_iter *iter)
1325 return iov_iter_is_aligned(iter, bdev_dma_alignment(bdev),
1326 bdev_logical_block_size(bdev) - 1);
1329 static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
1332 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
1333 return !(addr & alignment) && !(len & alignment);
1336 /* assumes size > 256 */
1337 static inline unsigned int blksize_bits(unsigned int size)
1339 unsigned int bits = 8;
1343 } while (size > 256);
1347 static inline unsigned int block_size(struct block_device *bdev)
1349 return 1 << bdev->bd_inode->i_blkbits;
1352 int kblockd_schedule_work(struct work_struct *work);
1353 int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
1355 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1356 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1357 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1358 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1360 #ifdef CONFIG_BLK_INLINE_ENCRYPTION
1362 bool blk_crypto_register(struct blk_crypto_profile *profile,
1363 struct request_queue *q);
1365 #else /* CONFIG_BLK_INLINE_ENCRYPTION */
1367 static inline bool blk_crypto_register(struct blk_crypto_profile *profile,
1368 struct request_queue *q)
1373 #endif /* CONFIG_BLK_INLINE_ENCRYPTION */
1375 enum blk_unique_id {
1376 /* these match the Designator Types specified in SPC */
1382 #define NFL4_UFLG_MASK 0x0000003F
1384 struct block_device_operations {
1385 void (*submit_bio)(struct bio *bio);
1386 int (*poll_bio)(struct bio *bio, struct io_comp_batch *iob,
1387 unsigned int flags);
1388 int (*open) (struct block_device *, fmode_t);
1389 void (*release) (struct gendisk *, fmode_t);
1390 int (*rw_page)(struct block_device *, sector_t, struct page *, enum req_op);
1391 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1392 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1393 unsigned int (*check_events) (struct gendisk *disk,
1394 unsigned int clearing);
1395 void (*unlock_native_capacity) (struct gendisk *);
1396 int (*getgeo)(struct block_device *, struct hd_geometry *);
1397 int (*set_read_only)(struct block_device *bdev, bool ro);
1398 void (*free_disk)(struct gendisk *disk);
1399 /* this callback is with swap_lock and sometimes page table lock held */
1400 void (*swap_slot_free_notify) (struct block_device *, unsigned long);
1401 int (*report_zones)(struct gendisk *, sector_t sector,
1402 unsigned int nr_zones, report_zones_cb cb, void *data);
1403 char *(*devnode)(struct gendisk *disk, umode_t *mode);
1404 /* returns the length of the identifier or a negative errno: */
1405 int (*get_unique_id)(struct gendisk *disk, u8 id[16],
1406 enum blk_unique_id id_type);
1407 struct module *owner;
1408 const struct pr_ops *pr_ops;
1411 * Special callback for probing GPT entry at a given sector.
1412 * Needed by Android devices, used by GPT scanner and MMC blk
1415 int (*alternative_gpt_sector)(struct gendisk *disk, sector_t *sector);
1418 #ifdef CONFIG_COMPAT
1419 extern int blkdev_compat_ptr_ioctl(struct block_device *, fmode_t,
1420 unsigned int, unsigned long);
1422 #define blkdev_compat_ptr_ioctl NULL
1425 extern int bdev_read_page(struct block_device *, sector_t, struct page *);
1426 extern int bdev_write_page(struct block_device *, sector_t, struct page *,
1427 struct writeback_control *);
1429 static inline void blk_wake_io_task(struct task_struct *waiter)
1432 * If we're polling, the task itself is doing the completions. For
1433 * that case, we don't need to signal a wakeup, it's enough to just
1434 * mark us as RUNNING.
1436 if (waiter == current)
1437 __set_current_state(TASK_RUNNING);
1439 wake_up_process(waiter);
1442 unsigned long bdev_start_io_acct(struct block_device *bdev,
1443 unsigned int sectors, enum req_op op,
1444 unsigned long start_time);
1445 void bdev_end_io_acct(struct block_device *bdev, enum req_op op,
1446 unsigned long start_time);
1448 void bio_start_io_acct_time(struct bio *bio, unsigned long start_time);
1449 unsigned long bio_start_io_acct(struct bio *bio);
1450 void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time,
1451 struct block_device *orig_bdev);
1454 * bio_end_io_acct - end I/O accounting for bio based drivers
1455 * @bio: bio to end account for
1456 * @start_time: start time returned by bio_start_io_acct()
1458 static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time)
1460 return bio_end_io_acct_remapped(bio, start_time, bio->bi_bdev);
1463 int bdev_read_only(struct block_device *bdev);
1464 int set_blocksize(struct block_device *bdev, int size);
1466 int lookup_bdev(const char *pathname, dev_t *dev);
1468 void blkdev_show(struct seq_file *seqf, off_t offset);
1470 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1471 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
1473 #define BLKDEV_MAJOR_MAX 512
1475 #define BLKDEV_MAJOR_MAX 0
1478 struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
1480 struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder);
1481 int bd_prepare_to_claim(struct block_device *bdev, void *holder);
1482 void bd_abort_claiming(struct block_device *bdev, void *holder);
1483 void blkdev_put(struct block_device *bdev, fmode_t mode);
1485 /* just for blk-cgroup, don't use elsewhere */
1486 struct block_device *blkdev_get_no_open(dev_t dev);
1487 void blkdev_put_no_open(struct block_device *bdev);
1489 struct block_device *bdev_alloc(struct gendisk *disk, u8 partno);
1490 void bdev_add(struct block_device *bdev, dev_t dev);
1491 struct block_device *I_BDEV(struct inode *inode);
1492 int truncate_bdev_range(struct block_device *bdev, fmode_t mode, loff_t lstart,
1496 void invalidate_bdev(struct block_device *bdev);
1497 int sync_blockdev(struct block_device *bdev);
1498 int sync_blockdev_range(struct block_device *bdev, loff_t lstart, loff_t lend);
1499 int sync_blockdev_nowait(struct block_device *bdev);
1500 void sync_bdevs(bool wait);
1501 void printk_all_partitions(void);
1503 static inline void invalidate_bdev(struct block_device *bdev)
1506 static inline int sync_blockdev(struct block_device *bdev)
1510 static inline int sync_blockdev_nowait(struct block_device *bdev)
1514 static inline void sync_bdevs(bool wait)
1517 static inline void printk_all_partitions(void)
1520 #endif /* CONFIG_BLOCK */
1522 int fsync_bdev(struct block_device *bdev);
1524 int freeze_bdev(struct block_device *bdev);
1525 int thaw_bdev(struct block_device *bdev);
1527 struct io_comp_batch {
1528 struct request *req_list;
1530 void (*complete)(struct io_comp_batch *);
1533 #define DEFINE_IO_COMP_BATCH(name) struct io_comp_batch name = { }
1535 #endif /* _LINUX_BLKDEV_H */