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>
30 struct elevator_queue;
35 struct blk_flush_queue;
39 struct blk_queue_stats;
40 struct blk_stat_callback;
41 struct blk_crypto_profile;
43 extern const struct device_type disk_type;
44 extern struct device_type part_type;
45 extern struct class block_class;
48 * Maximum number of blkcg policies allowed to be registered concurrently.
49 * Defined here to simplify include dependency.
51 #define BLKCG_MAX_POLS 6
53 #define DISK_MAX_PARTS 256
54 #define DISK_NAME_LEN 32
56 #define PARTITION_META_INFO_VOLNAMELTH 64
58 * Enough for the string representation of any kind of UUID plus NULL.
59 * EFI UUID is 36 characters. MSDOS UUID is 11 characters.
61 #define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1)
63 struct partition_meta_info {
64 char uuid[PARTITION_META_INFO_UUIDLTH];
65 u8 volname[PARTITION_META_INFO_VOLNAMELTH];
69 * DOC: genhd capability flags
71 * ``GENHD_FL_REMOVABLE``: indicates that the block device gives access to
72 * removable media. When set, the device remains present even when media is not
73 * inserted. Shall not be set for devices which are removed entirely when the
76 * ``GENHD_FL_HIDDEN``: the block device is hidden; it doesn't produce events,
77 * doesn't appear in sysfs, and can't be opened from userspace or using
78 * blkdev_get*. Used for the underlying components of multipath devices.
80 * ``GENHD_FL_NO_PART``: partition support is disabled. The kernel will not
81 * scan for partitions from add_disk, and users can't add partitions manually.
85 GENHD_FL_REMOVABLE = 1 << 0,
86 GENHD_FL_HIDDEN = 1 << 1,
87 GENHD_FL_NO_PART = 1 << 2,
91 DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */
92 DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */
96 /* Poll even if events_poll_msecs is unset */
97 DISK_EVENT_FLAG_POLL = 1 << 0,
98 /* Forward events to udev */
99 DISK_EVENT_FLAG_UEVENT = 1 << 1,
100 /* Block event polling when open for exclusive write */
101 DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE = 1 << 2,
107 struct blk_integrity {
108 const struct blk_integrity_profile *profile;
110 unsigned char tuple_size;
111 unsigned char interval_exp;
112 unsigned char tag_size;
117 * major/first_minor/minors should not be set by any new driver, the
118 * block core will take care of allocating them automatically.
124 char disk_name[DISK_NAME_LEN]; /* name of major driver */
126 unsigned short events; /* supported events */
127 unsigned short event_flags; /* flags related to event processing */
129 struct xarray part_tbl;
130 struct block_device *part0;
132 const struct block_device_operations *fops;
133 struct request_queue *queue;
136 struct bio_set bio_split;
140 #define GD_NEED_PART_SCAN 0
141 #define GD_READ_ONLY 1
143 #define GD_NATIVE_CAPACITY 3
145 #define GD_SUPPRESS_PART_SCAN 5
146 #define GD_OWNS_QUEUE 6
148 struct mutex open_mutex; /* open/close mutex */
149 unsigned open_partitions; /* number of open partitions */
151 struct backing_dev_info *bdi;
152 struct kobject queue_kobj; /* the queue/ directory */
153 struct kobject *slave_dir;
154 #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED
155 struct list_head slave_bdevs;
157 struct timer_rand_state *random;
158 atomic_t sync_io; /* RAID */
159 struct disk_events *ev;
160 #ifdef CONFIG_BLK_DEV_INTEGRITY
161 struct kobject integrity_kobj;
162 #endif /* CONFIG_BLK_DEV_INTEGRITY */
164 #ifdef CONFIG_BLK_DEV_ZONED
166 * Zoned block device information for request dispatch control.
167 * nr_zones is the total number of zones of the device. This is always
168 * 0 for regular block devices. conv_zones_bitmap is a bitmap of nr_zones
169 * bits which indicates if a zone is conventional (bit set) or
170 * sequential (bit clear). seq_zones_wlock is a bitmap of nr_zones
171 * bits which indicates if a zone is write locked, that is, if a write
172 * request targeting the zone was dispatched.
174 * Reads of this information must be protected with blk_queue_enter() /
175 * blk_queue_exit(). Modifying this information is only allowed while
176 * no requests are being processed. See also blk_mq_freeze_queue() and
177 * blk_mq_unfreeze_queue().
179 unsigned int nr_zones;
180 unsigned int max_open_zones;
181 unsigned int max_active_zones;
182 unsigned long *conv_zones_bitmap;
183 unsigned long *seq_zones_wlock;
184 #endif /* CONFIG_BLK_DEV_ZONED */
186 #if IS_ENABLED(CONFIG_CDROM)
187 struct cdrom_device_info *cdi;
190 struct badblocks *bb;
191 struct lockdep_map lockdep_map;
195 * Independent sector access ranges. This is always NULL for
196 * devices that do not have multiple independent access ranges.
198 struct blk_independent_access_ranges *ia_ranges;
201 static inline bool disk_live(struct gendisk *disk)
203 return !inode_unhashed(disk->part0->bd_inode);
207 * disk_openers - returns how many openers are there for a disk
208 * @disk: disk to check
210 * This returns the number of openers for a disk. Note that this value is only
211 * stable if disk->open_mutex is held.
213 * Note: Due to a quirk in the block layer open code, each open partition is
214 * only counted once even if there are multiple openers.
216 static inline unsigned int disk_openers(struct gendisk *disk)
218 return atomic_read(&disk->part0->bd_openers);
222 * The gendisk is refcounted by the part0 block_device, and the bd_device
223 * therein is also used for device model presentation in sysfs.
225 #define dev_to_disk(device) \
226 (dev_to_bdev(device)->bd_disk)
227 #define disk_to_dev(disk) \
228 (&((disk)->part0->bd_device))
230 #if IS_REACHABLE(CONFIG_CDROM)
231 #define disk_to_cdi(disk) ((disk)->cdi)
233 #define disk_to_cdi(disk) NULL
236 static inline dev_t disk_devt(struct gendisk *disk)
238 return MKDEV(disk->major, disk->first_minor);
241 static inline int blk_validate_block_size(unsigned long bsize)
243 if (bsize < 512 || bsize > PAGE_SIZE || !is_power_of_2(bsize))
249 static inline bool blk_op_is_passthrough(blk_opf_t op)
252 return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT;
256 * Zoned block device models (zoned limit).
258 * Note: This needs to be ordered from the least to the most severe
259 * restrictions for the inheritance in blk_stack_limits() to work.
261 enum blk_zoned_model {
262 BLK_ZONED_NONE = 0, /* Regular block device */
263 BLK_ZONED_HA, /* Host-aware zoned block device */
264 BLK_ZONED_HM, /* Host-managed zoned block device */
268 * BLK_BOUNCE_NONE: never bounce (default)
269 * BLK_BOUNCE_HIGH: bounce all highmem pages
276 struct queue_limits {
277 enum blk_bounce bounce;
278 unsigned long seg_boundary_mask;
279 unsigned long virt_boundary_mask;
281 unsigned int max_hw_sectors;
282 unsigned int max_dev_sectors;
283 unsigned int chunk_sectors;
284 unsigned int max_sectors;
285 unsigned int max_user_sectors;
286 unsigned int max_segment_size;
287 unsigned int physical_block_size;
288 unsigned int logical_block_size;
289 unsigned int alignment_offset;
292 unsigned int max_discard_sectors;
293 unsigned int max_hw_discard_sectors;
294 unsigned int max_secure_erase_sectors;
295 unsigned int max_write_zeroes_sectors;
296 unsigned int max_zone_append_sectors;
297 unsigned int discard_granularity;
298 unsigned int discard_alignment;
299 unsigned int zone_write_granularity;
301 unsigned short max_segments;
302 unsigned short max_integrity_segments;
303 unsigned short max_discard_segments;
305 unsigned char misaligned;
306 unsigned char discard_misaligned;
307 unsigned char raid_partial_stripes_expensive;
308 enum blk_zoned_model zoned;
311 * Drivers that set dma_alignment to less than 511 must be prepared to
312 * handle individual bvec's that are not a multiple of a SECTOR_SIZE
313 * due to possible offsets.
315 unsigned int dma_alignment;
318 typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx,
321 void disk_set_zoned(struct gendisk *disk, enum blk_zoned_model model);
323 #ifdef CONFIG_BLK_DEV_ZONED
325 #define BLK_ALL_ZONES ((unsigned int)-1)
326 int blkdev_report_zones(struct block_device *bdev, sector_t sector,
327 unsigned int nr_zones, report_zones_cb cb, void *data);
328 unsigned int bdev_nr_zones(struct block_device *bdev);
329 extern int blkdev_zone_mgmt(struct block_device *bdev, enum req_op op,
330 sector_t sectors, sector_t nr_sectors,
332 int blk_revalidate_disk_zones(struct gendisk *disk,
333 void (*update_driver_data)(struct gendisk *disk));
335 extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
336 unsigned int cmd, unsigned long arg);
337 extern int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode,
338 unsigned int cmd, unsigned long arg);
340 #else /* CONFIG_BLK_DEV_ZONED */
342 static inline unsigned int bdev_nr_zones(struct block_device *bdev)
347 static inline int blkdev_report_zones_ioctl(struct block_device *bdev,
348 fmode_t mode, unsigned int cmd,
354 static inline int blkdev_zone_mgmt_ioctl(struct block_device *bdev,
355 fmode_t mode, unsigned int cmd,
361 #endif /* CONFIG_BLK_DEV_ZONED */
364 * Independent access ranges: struct blk_independent_access_range describes
365 * a range of contiguous sectors that can be accessed using device command
366 * execution resources that are independent from the resources used for
367 * other access ranges. This is typically found with single-LUN multi-actuator
368 * HDDs where each access range is served by a different set of heads.
369 * The set of independent ranges supported by the device is defined using
370 * struct blk_independent_access_ranges. The independent ranges must not overlap
371 * and must include all sectors within the disk capacity (no sector holes
373 * For a device with multiple ranges, requests targeting sectors in different
374 * ranges can be executed in parallel. A request can straddle an access range
377 struct blk_independent_access_range {
383 struct blk_independent_access_ranges {
385 bool sysfs_registered;
386 unsigned int nr_ia_ranges;
387 struct blk_independent_access_range ia_range[];
390 struct request_queue {
391 struct request *last_merge;
392 struct elevator_queue *elevator;
394 struct percpu_ref q_usage_counter;
396 struct blk_queue_stats *stats;
397 struct rq_qos *rq_qos;
399 const struct blk_mq_ops *mq_ops;
402 struct blk_mq_ctx __percpu *queue_ctx;
404 unsigned int queue_depth;
406 /* hw dispatch queues */
407 struct xarray hctx_table;
408 unsigned int nr_hw_queues;
411 * The queue owner gets to use this for whatever they like.
412 * ll_rw_blk doesn't touch it.
417 * various queue flags, see QUEUE_* below
419 unsigned long queue_flags;
421 * Number of contexts that have called blk_set_pm_only(). If this
422 * counter is above zero then only RQF_PM requests are processed.
427 * ida allocated id for this queue. Used to index queues from
432 spinlock_t queue_lock;
434 struct gendisk *disk;
441 struct kobject *mq_kobj;
443 #ifdef CONFIG_BLK_DEV_INTEGRITY
444 struct blk_integrity integrity;
445 #endif /* CONFIG_BLK_DEV_INTEGRITY */
449 enum rpm_status rpm_status;
455 unsigned long nr_requests; /* Max # of requests */
457 unsigned int dma_pad_mask;
459 #ifdef CONFIG_BLK_INLINE_ENCRYPTION
460 struct blk_crypto_profile *crypto_profile;
461 struct kobject *crypto_kobject;
464 unsigned int rq_timeout;
466 struct timer_list timeout;
467 struct work_struct timeout_work;
469 atomic_t nr_active_requests_shared_tags;
471 struct blk_mq_tags *sched_shared_tags;
473 struct list_head icq_list;
474 #ifdef CONFIG_BLK_CGROUP
475 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
476 struct blkcg_gq *root_blkg;
477 struct list_head blkg_list;
478 struct mutex blkcg_mutex;
481 struct queue_limits limits;
483 unsigned int required_elevator_features;
486 #ifdef CONFIG_BLK_DEV_IO_TRACE
487 struct blk_trace __rcu *blk_trace;
490 * for flush operations
492 struct blk_flush_queue *fq;
494 struct list_head requeue_list;
495 spinlock_t requeue_lock;
496 struct delayed_work requeue_work;
498 struct mutex sysfs_lock;
499 struct mutex sysfs_dir_lock;
502 * for reusing dead hctx instance in case of updating
505 struct list_head unused_hctx_list;
506 spinlock_t unused_hctx_lock;
510 #ifdef CONFIG_BLK_DEV_THROTTLING
512 struct throtl_data *td;
514 struct rcu_head rcu_head;
515 wait_queue_head_t mq_freeze_wq;
517 * Protect concurrent access to q_usage_counter by
518 * percpu_ref_kill() and percpu_ref_reinit().
520 struct mutex mq_freeze_lock;
524 struct blk_mq_tag_set *tag_set;
525 struct list_head tag_set_list;
527 struct dentry *debugfs_dir;
528 struct dentry *sched_debugfs_dir;
529 struct dentry *rqos_debugfs_dir;
531 * Serializes all debugfs metadata operations using the above dentries.
533 struct mutex debugfs_mutex;
535 bool mq_sysfs_init_done;
538 /* Keep blk_queue_flag_name[] in sync with the definitions below */
539 #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */
540 #define QUEUE_FLAG_DYING 1 /* queue being torn down */
541 #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */
542 #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */
543 #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */
544 #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */
545 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
546 #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */
547 #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */
548 #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */
549 #define QUEUE_FLAG_SYNCHRONOUS 11 /* always completes in submit context */
550 #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */
551 #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */
552 #define QUEUE_FLAG_STABLE_WRITES 15 /* don't modify blks until WB is done */
553 #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */
554 #define QUEUE_FLAG_WC 17 /* Write back caching */
555 #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */
556 #define QUEUE_FLAG_DAX 19 /* device supports DAX */
557 #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */
558 #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */
559 #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */
560 #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */
561 #define QUEUE_FLAG_ZONE_RESETALL 26 /* supports Zone Reset All */
562 #define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */
563 #define QUEUE_FLAG_HCTX_ACTIVE 28 /* at least one blk-mq hctx is active */
564 #define QUEUE_FLAG_NOWAIT 29 /* device supports NOWAIT */
565 #define QUEUE_FLAG_SQ_SCHED 30 /* single queue style io dispatch */
566 #define QUEUE_FLAG_SKIP_TAGSET_QUIESCE 31 /* quiesce_tagset skip the queue*/
568 #define QUEUE_FLAG_MQ_DEFAULT ((1UL << QUEUE_FLAG_IO_STAT) | \
569 (1UL << QUEUE_FLAG_SAME_COMP) | \
570 (1UL << QUEUE_FLAG_NOWAIT))
572 void blk_queue_flag_set(unsigned int flag, struct request_queue *q);
573 void blk_queue_flag_clear(unsigned int flag, struct request_queue *q);
574 bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
576 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
577 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
578 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
579 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
580 #define blk_queue_noxmerges(q) \
581 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
582 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
583 #define blk_queue_stable_writes(q) \
584 test_bit(QUEUE_FLAG_STABLE_WRITES, &(q)->queue_flags)
585 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
586 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
587 #define blk_queue_zone_resetall(q) \
588 test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags)
589 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
590 #define blk_queue_pci_p2pdma(q) \
591 test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags)
592 #ifdef CONFIG_BLK_RQ_ALLOC_TIME
593 #define blk_queue_rq_alloc_time(q) \
594 test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags)
596 #define blk_queue_rq_alloc_time(q) false
599 #define blk_noretry_request(rq) \
600 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
601 REQ_FAILFAST_DRIVER))
602 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
603 #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only)
604 #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags)
605 #define blk_queue_sq_sched(q) test_bit(QUEUE_FLAG_SQ_SCHED, &(q)->queue_flags)
606 #define blk_queue_skip_tagset_quiesce(q) \
607 test_bit(QUEUE_FLAG_SKIP_TAGSET_QUIESCE, &(q)->queue_flags)
609 extern void blk_set_pm_only(struct request_queue *q);
610 extern void blk_clear_pm_only(struct request_queue *q);
612 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
614 #define dma_map_bvec(dev, bv, dir, attrs) \
615 dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \
618 static inline bool queue_is_mq(struct request_queue *q)
624 static inline enum rpm_status queue_rpm_status(struct request_queue *q)
626 return q->rpm_status;
629 static inline enum rpm_status queue_rpm_status(struct request_queue *q)
635 static inline enum blk_zoned_model
636 blk_queue_zoned_model(struct request_queue *q)
638 if (IS_ENABLED(CONFIG_BLK_DEV_ZONED))
639 return q->limits.zoned;
640 return BLK_ZONED_NONE;
643 static inline bool blk_queue_is_zoned(struct request_queue *q)
645 switch (blk_queue_zoned_model(q)) {
654 #ifdef CONFIG_BLK_DEV_ZONED
655 static inline unsigned int disk_nr_zones(struct gendisk *disk)
657 return blk_queue_is_zoned(disk->queue) ? disk->nr_zones : 0;
660 static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector)
662 if (!blk_queue_is_zoned(disk->queue))
664 return sector >> ilog2(disk->queue->limits.chunk_sectors);
667 static inline bool disk_zone_is_seq(struct gendisk *disk, sector_t sector)
669 if (!blk_queue_is_zoned(disk->queue))
671 if (!disk->conv_zones_bitmap)
673 return !test_bit(disk_zone_no(disk, sector), disk->conv_zones_bitmap);
676 static inline void disk_set_max_open_zones(struct gendisk *disk,
677 unsigned int max_open_zones)
679 disk->max_open_zones = max_open_zones;
682 static inline void disk_set_max_active_zones(struct gendisk *disk,
683 unsigned int max_active_zones)
685 disk->max_active_zones = max_active_zones;
688 static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
690 return bdev->bd_disk->max_open_zones;
693 static inline unsigned int bdev_max_active_zones(struct block_device *bdev)
695 return bdev->bd_disk->max_active_zones;
698 #else /* CONFIG_BLK_DEV_ZONED */
699 static inline unsigned int disk_nr_zones(struct gendisk *disk)
703 static inline bool disk_zone_is_seq(struct gendisk *disk, sector_t sector)
707 static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector)
711 static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
716 static inline unsigned int bdev_max_active_zones(struct block_device *bdev)
720 #endif /* CONFIG_BLK_DEV_ZONED */
722 static inline unsigned int blk_queue_depth(struct request_queue *q)
725 return q->queue_depth;
727 return q->nr_requests;
731 * default timeout for SG_IO if none specified
733 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
734 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
736 /* This should not be used directly - use rq_for_each_segment */
737 #define for_each_bio(_bio) \
738 for (; _bio; _bio = _bio->bi_next)
740 int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
741 const struct attribute_group **groups);
742 static inline int __must_check add_disk(struct gendisk *disk)
744 return device_add_disk(NULL, disk, NULL);
746 void del_gendisk(struct gendisk *gp);
747 void invalidate_disk(struct gendisk *disk);
748 void set_disk_ro(struct gendisk *disk, bool read_only);
749 void disk_uevent(struct gendisk *disk, enum kobject_action action);
751 static inline int get_disk_ro(struct gendisk *disk)
753 return disk->part0->bd_read_only ||
754 test_bit(GD_READ_ONLY, &disk->state);
757 static inline int bdev_read_only(struct block_device *bdev)
759 return bdev->bd_read_only || get_disk_ro(bdev->bd_disk);
762 bool set_capacity_and_notify(struct gendisk *disk, sector_t size);
763 bool disk_force_media_change(struct gendisk *disk, unsigned int events);
765 void add_disk_randomness(struct gendisk *disk) __latent_entropy;
766 void rand_initialize_disk(struct gendisk *disk);
768 static inline sector_t get_start_sect(struct block_device *bdev)
770 return bdev->bd_start_sect;
773 static inline sector_t bdev_nr_sectors(struct block_device *bdev)
775 return bdev->bd_nr_sectors;
778 static inline loff_t bdev_nr_bytes(struct block_device *bdev)
780 return (loff_t)bdev_nr_sectors(bdev) << SECTOR_SHIFT;
783 static inline sector_t get_capacity(struct gendisk *disk)
785 return bdev_nr_sectors(disk->part0);
788 static inline u64 sb_bdev_nr_blocks(struct super_block *sb)
790 return bdev_nr_sectors(sb->s_bdev) >>
791 (sb->s_blocksize_bits - SECTOR_SHIFT);
794 int bdev_disk_changed(struct gendisk *disk, bool invalidate);
796 void put_disk(struct gendisk *disk);
797 struct gendisk *__blk_alloc_disk(int node, struct lock_class_key *lkclass);
800 * blk_alloc_disk - allocate a gendisk structure
801 * @node_id: numa node to allocate on
803 * Allocate and pre-initialize a gendisk structure for use with BIO based
808 #define blk_alloc_disk(node_id) \
810 static struct lock_class_key __key; \
812 __blk_alloc_disk(node_id, &__key); \
815 int __register_blkdev(unsigned int major, const char *name,
816 void (*probe)(dev_t devt));
817 #define register_blkdev(major, name) \
818 __register_blkdev(major, name, NULL)
819 void unregister_blkdev(unsigned int major, const char *name);
821 bool bdev_check_media_change(struct block_device *bdev);
822 int __invalidate_device(struct block_device *bdev, bool kill_dirty);
823 void set_capacity(struct gendisk *disk, sector_t size);
825 #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED
826 int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
827 void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk);
829 static inline int bd_link_disk_holder(struct block_device *bdev,
830 struct gendisk *disk)
834 static inline void bd_unlink_disk_holder(struct block_device *bdev,
835 struct gendisk *disk)
838 #endif /* CONFIG_BLOCK_HOLDER_DEPRECATED */
840 dev_t part_devt(struct gendisk *disk, u8 partno);
841 void inc_diskseq(struct gendisk *disk);
842 dev_t blk_lookup_devt(const char *name, int partno);
843 void blk_request_module(dev_t devt);
845 extern int blk_register_queue(struct gendisk *disk);
846 extern void blk_unregister_queue(struct gendisk *disk);
847 void submit_bio_noacct(struct bio *bio);
848 struct bio *bio_split_to_limits(struct bio *bio);
850 extern int blk_lld_busy(struct request_queue *q);
851 extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags);
852 extern void blk_queue_exit(struct request_queue *q);
853 extern void blk_sync_queue(struct request_queue *q);
855 /* Helper to convert REQ_OP_XXX to its string format XXX */
856 extern const char *blk_op_str(enum req_op op);
858 int blk_status_to_errno(blk_status_t status);
859 blk_status_t errno_to_blk_status(int errno);
861 /* only poll the hardware once, don't continue until a completion was found */
862 #define BLK_POLL_ONESHOT (1 << 0)
863 int bio_poll(struct bio *bio, struct io_comp_batch *iob, unsigned int flags);
864 int iocb_bio_iopoll(struct kiocb *kiocb, struct io_comp_batch *iob,
867 static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
869 return bdev->bd_queue; /* this is never NULL */
872 /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */
873 const char *blk_zone_cond_str(enum blk_zone_cond zone_cond);
875 static inline unsigned int bio_zone_no(struct bio *bio)
877 return disk_zone_no(bio->bi_bdev->bd_disk, bio->bi_iter.bi_sector);
880 static inline unsigned int bio_zone_is_seq(struct bio *bio)
882 return disk_zone_is_seq(bio->bi_bdev->bd_disk, bio->bi_iter.bi_sector);
886 * Return how much of the chunk is left to be used for I/O at a given offset.
888 static inline unsigned int blk_chunk_sectors_left(sector_t offset,
889 unsigned int chunk_sectors)
891 if (unlikely(!is_power_of_2(chunk_sectors)))
892 return chunk_sectors - sector_div(offset, chunk_sectors);
893 return chunk_sectors - (offset & (chunk_sectors - 1));
897 * Access functions for manipulating queue properties
899 void blk_queue_bounce_limit(struct request_queue *q, enum blk_bounce limit);
900 extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
901 extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
902 extern void blk_queue_max_segments(struct request_queue *, unsigned short);
903 extern void blk_queue_max_discard_segments(struct request_queue *,
905 void blk_queue_max_secure_erase_sectors(struct request_queue *q,
906 unsigned int max_sectors);
907 extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
908 extern void blk_queue_max_discard_sectors(struct request_queue *q,
909 unsigned int max_discard_sectors);
910 extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
911 unsigned int max_write_same_sectors);
912 extern void blk_queue_logical_block_size(struct request_queue *, unsigned int);
913 extern void blk_queue_max_zone_append_sectors(struct request_queue *q,
914 unsigned int max_zone_append_sectors);
915 extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
916 void blk_queue_zone_write_granularity(struct request_queue *q,
918 extern void blk_queue_alignment_offset(struct request_queue *q,
919 unsigned int alignment);
920 void disk_update_readahead(struct gendisk *disk);
921 extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
922 extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
923 extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
924 extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
925 extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
926 extern void blk_set_stacking_limits(struct queue_limits *lim);
927 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
929 extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
931 extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
932 extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
933 extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
934 extern void blk_queue_dma_alignment(struct request_queue *, int);
935 extern void blk_queue_update_dma_alignment(struct request_queue *, int);
936 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
937 extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
939 struct blk_independent_access_ranges *
940 disk_alloc_independent_access_ranges(struct gendisk *disk, int nr_ia_ranges);
941 void disk_set_independent_access_ranges(struct gendisk *disk,
942 struct blk_independent_access_ranges *iars);
945 * Elevator features for blk_queue_required_elevator_features:
947 /* Supports zoned block devices sequential write constraint */
948 #define ELEVATOR_F_ZBD_SEQ_WRITE (1U << 0)
950 extern void blk_queue_required_elevator_features(struct request_queue *q,
951 unsigned int features);
952 extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q,
955 bool __must_check blk_get_queue(struct request_queue *);
956 extern void blk_put_queue(struct request_queue *);
958 void blk_mark_disk_dead(struct gendisk *disk);
962 * blk_plug permits building a queue of related requests by holding the I/O
963 * fragments for a short period. This allows merging of sequential requests
964 * into single larger request. As the requests are moved from a per-task list to
965 * the device's request_queue in a batch, this results in improved scalability
966 * as the lock contention for request_queue lock is reduced.
968 * It is ok not to disable preemption when adding the request to the plug list
969 * or when attempting a merge. For details, please see schedule() where
970 * blk_flush_plug() is called.
973 struct request *mq_list; /* blk-mq requests */
975 /* if ios_left is > 1, we can batch tag/rq allocations */
976 struct request *cached_rq;
977 unsigned short nr_ios;
979 unsigned short rq_count;
981 bool multiple_queues;
985 struct list_head cb_list; /* md requires an unplug callback */
989 typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
991 struct list_head list;
992 blk_plug_cb_fn callback;
995 extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
996 void *data, int size);
997 extern void blk_start_plug(struct blk_plug *);
998 extern void blk_start_plug_nr_ios(struct blk_plug *, unsigned short);
999 extern void blk_finish_plug(struct blk_plug *);
1001 void __blk_flush_plug(struct blk_plug *plug, bool from_schedule);
1002 static inline void blk_flush_plug(struct blk_plug *plug, bool async)
1005 __blk_flush_plug(plug, async);
1008 int blkdev_issue_flush(struct block_device *bdev);
1009 long nr_blockdev_pages(void);
1010 #else /* CONFIG_BLOCK */
1014 static inline void blk_start_plug_nr_ios(struct blk_plug *plug,
1015 unsigned short nr_ios)
1019 static inline void blk_start_plug(struct blk_plug *plug)
1023 static inline void blk_finish_plug(struct blk_plug *plug)
1027 static inline void blk_flush_plug(struct blk_plug *plug, bool async)
1031 static inline int blkdev_issue_flush(struct block_device *bdev)
1036 static inline long nr_blockdev_pages(void)
1040 #endif /* CONFIG_BLOCK */
1042 extern void blk_io_schedule(void);
1044 int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1045 sector_t nr_sects, gfp_t gfp_mask);
1046 int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1047 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop);
1048 int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector,
1049 sector_t nr_sects, gfp_t gfp);
1051 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
1052 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
1054 extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1055 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
1057 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1058 sector_t nr_sects, gfp_t gfp_mask, unsigned flags);
1060 static inline int sb_issue_discard(struct super_block *sb, sector_t block,
1061 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
1063 return blkdev_issue_discard(sb->s_bdev,
1064 block << (sb->s_blocksize_bits -
1066 nr_blocks << (sb->s_blocksize_bits -
1070 static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
1071 sector_t nr_blocks, gfp_t gfp_mask)
1073 return blkdev_issue_zeroout(sb->s_bdev,
1074 block << (sb->s_blocksize_bits -
1076 nr_blocks << (sb->s_blocksize_bits -
1081 static inline bool bdev_is_partition(struct block_device *bdev)
1083 return bdev->bd_partno;
1086 enum blk_default_limits {
1087 BLK_MAX_SEGMENTS = 128,
1088 BLK_SAFE_MAX_SECTORS = 255,
1089 BLK_MAX_SEGMENT_SIZE = 65536,
1090 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
1093 #define BLK_DEF_MAX_SECTORS 2560u
1095 static inline unsigned long queue_segment_boundary(const struct request_queue *q)
1097 return q->limits.seg_boundary_mask;
1100 static inline unsigned long queue_virt_boundary(const struct request_queue *q)
1102 return q->limits.virt_boundary_mask;
1105 static inline unsigned int queue_max_sectors(const struct request_queue *q)
1107 return q->limits.max_sectors;
1110 static inline unsigned int queue_max_bytes(struct request_queue *q)
1112 return min_t(unsigned int, queue_max_sectors(q), INT_MAX >> 9) << 9;
1115 static inline unsigned int queue_max_hw_sectors(const struct request_queue *q)
1117 return q->limits.max_hw_sectors;
1120 static inline unsigned short queue_max_segments(const struct request_queue *q)
1122 return q->limits.max_segments;
1125 static inline unsigned short queue_max_discard_segments(const struct request_queue *q)
1127 return q->limits.max_discard_segments;
1130 static inline unsigned int queue_max_segment_size(const struct request_queue *q)
1132 return q->limits.max_segment_size;
1135 static inline unsigned int queue_max_zone_append_sectors(const struct request_queue *q)
1138 const struct queue_limits *l = &q->limits;
1140 return min(l->max_zone_append_sectors, l->max_sectors);
1143 static inline unsigned int
1144 bdev_max_zone_append_sectors(struct block_device *bdev)
1146 return queue_max_zone_append_sectors(bdev_get_queue(bdev));
1149 static inline unsigned int bdev_max_segments(struct block_device *bdev)
1151 return queue_max_segments(bdev_get_queue(bdev));
1154 static inline unsigned queue_logical_block_size(const struct request_queue *q)
1158 if (q && q->limits.logical_block_size)
1159 retval = q->limits.logical_block_size;
1164 static inline unsigned int bdev_logical_block_size(struct block_device *bdev)
1166 return queue_logical_block_size(bdev_get_queue(bdev));
1169 static inline unsigned int queue_physical_block_size(const struct request_queue *q)
1171 return q->limits.physical_block_size;
1174 static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
1176 return queue_physical_block_size(bdev_get_queue(bdev));
1179 static inline unsigned int queue_io_min(const struct request_queue *q)
1181 return q->limits.io_min;
1184 static inline int bdev_io_min(struct block_device *bdev)
1186 return queue_io_min(bdev_get_queue(bdev));
1189 static inline unsigned int queue_io_opt(const struct request_queue *q)
1191 return q->limits.io_opt;
1194 static inline int bdev_io_opt(struct block_device *bdev)
1196 return queue_io_opt(bdev_get_queue(bdev));
1199 static inline unsigned int
1200 queue_zone_write_granularity(const struct request_queue *q)
1202 return q->limits.zone_write_granularity;
1205 static inline unsigned int
1206 bdev_zone_write_granularity(struct block_device *bdev)
1208 return queue_zone_write_granularity(bdev_get_queue(bdev));
1211 int bdev_alignment_offset(struct block_device *bdev);
1212 unsigned int bdev_discard_alignment(struct block_device *bdev);
1214 static inline unsigned int bdev_max_discard_sectors(struct block_device *bdev)
1216 return bdev_get_queue(bdev)->limits.max_discard_sectors;
1219 static inline unsigned int bdev_discard_granularity(struct block_device *bdev)
1221 return bdev_get_queue(bdev)->limits.discard_granularity;
1224 static inline unsigned int
1225 bdev_max_secure_erase_sectors(struct block_device *bdev)
1227 return bdev_get_queue(bdev)->limits.max_secure_erase_sectors;
1230 static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
1232 struct request_queue *q = bdev_get_queue(bdev);
1235 return q->limits.max_write_zeroes_sectors;
1240 static inline bool bdev_nonrot(struct block_device *bdev)
1242 return blk_queue_nonrot(bdev_get_queue(bdev));
1245 static inline bool bdev_synchronous(struct block_device *bdev)
1247 return test_bit(QUEUE_FLAG_SYNCHRONOUS,
1248 &bdev_get_queue(bdev)->queue_flags);
1251 static inline bool bdev_stable_writes(struct block_device *bdev)
1253 return test_bit(QUEUE_FLAG_STABLE_WRITES,
1254 &bdev_get_queue(bdev)->queue_flags);
1257 static inline bool bdev_write_cache(struct block_device *bdev)
1259 return test_bit(QUEUE_FLAG_WC, &bdev_get_queue(bdev)->queue_flags);
1262 static inline bool bdev_fua(struct block_device *bdev)
1264 return test_bit(QUEUE_FLAG_FUA, &bdev_get_queue(bdev)->queue_flags);
1267 static inline bool bdev_nowait(struct block_device *bdev)
1269 return test_bit(QUEUE_FLAG_NOWAIT, &bdev_get_queue(bdev)->queue_flags);
1272 static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev)
1274 return blk_queue_zoned_model(bdev_get_queue(bdev));
1277 static inline bool bdev_is_zoned(struct block_device *bdev)
1279 return blk_queue_is_zoned(bdev_get_queue(bdev));
1282 static inline unsigned int bdev_zone_no(struct block_device *bdev, sector_t sec)
1284 return disk_zone_no(bdev->bd_disk, sec);
1287 static inline bool bdev_op_is_zoned_write(struct block_device *bdev,
1290 if (!bdev_is_zoned(bdev))
1293 return op == REQ_OP_WRITE || op == REQ_OP_WRITE_ZEROES;
1296 static inline sector_t bdev_zone_sectors(struct block_device *bdev)
1298 struct request_queue *q = bdev_get_queue(bdev);
1300 if (!blk_queue_is_zoned(q))
1302 return q->limits.chunk_sectors;
1305 static inline sector_t bdev_offset_from_zone_start(struct block_device *bdev,
1308 return sector & (bdev_zone_sectors(bdev) - 1);
1311 static inline bool bdev_is_zone_start(struct block_device *bdev,
1314 return bdev_offset_from_zone_start(bdev, sector) == 0;
1317 static inline int queue_dma_alignment(const struct request_queue *q)
1319 return q ? q->limits.dma_alignment : 511;
1322 static inline unsigned int bdev_dma_alignment(struct block_device *bdev)
1324 return queue_dma_alignment(bdev_get_queue(bdev));
1327 static inline bool bdev_iter_is_aligned(struct block_device *bdev,
1328 struct iov_iter *iter)
1330 return iov_iter_is_aligned(iter, bdev_dma_alignment(bdev),
1331 bdev_logical_block_size(bdev) - 1);
1334 static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
1337 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
1338 return !(addr & alignment) && !(len & alignment);
1341 /* assumes size > 256 */
1342 static inline unsigned int blksize_bits(unsigned int size)
1344 return order_base_2(size >> SECTOR_SHIFT) + SECTOR_SHIFT;
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 (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1391 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1392 unsigned int (*check_events) (struct gendisk *disk,
1393 unsigned int clearing);
1394 void (*unlock_native_capacity) (struct gendisk *);
1395 int (*getgeo)(struct block_device *, struct hd_geometry *);
1396 int (*set_read_only)(struct block_device *bdev, bool ro);
1397 void (*free_disk)(struct gendisk *disk);
1398 /* this callback is with swap_lock and sometimes page table lock held */
1399 void (*swap_slot_free_notify) (struct block_device *, unsigned long);
1400 int (*report_zones)(struct gendisk *, sector_t sector,
1401 unsigned int nr_zones, report_zones_cb cb, void *data);
1402 char *(*devnode)(struct gendisk *disk, umode_t *mode);
1403 /* returns the length of the identifier or a negative errno: */
1404 int (*get_unique_id)(struct gendisk *disk, u8 id[16],
1405 enum blk_unique_id id_type);
1406 struct module *owner;
1407 const struct pr_ops *pr_ops;
1410 * Special callback for probing GPT entry at a given sector.
1411 * Needed by Android devices, used by GPT scanner and MMC blk
1414 int (*alternative_gpt_sector)(struct gendisk *disk, sector_t *sector);
1417 #ifdef CONFIG_COMPAT
1418 extern int blkdev_compat_ptr_ioctl(struct block_device *, fmode_t,
1419 unsigned int, unsigned long);
1421 #define blkdev_compat_ptr_ioctl NULL
1424 static inline void blk_wake_io_task(struct task_struct *waiter)
1427 * If we're polling, the task itself is doing the completions. For
1428 * that case, we don't need to signal a wakeup, it's enough to just
1429 * mark us as RUNNING.
1431 if (waiter == current)
1432 __set_current_state(TASK_RUNNING);
1434 wake_up_process(waiter);
1437 unsigned long bdev_start_io_acct(struct block_device *bdev, enum req_op op,
1438 unsigned long start_time);
1439 void bdev_end_io_acct(struct block_device *bdev, enum req_op op,
1440 unsigned int sectors, unsigned long start_time);
1442 unsigned long bio_start_io_acct(struct bio *bio);
1443 void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time,
1444 struct block_device *orig_bdev);
1447 * bio_end_io_acct - end I/O accounting for bio based drivers
1448 * @bio: bio to end account for
1449 * @start_time: start time returned by bio_start_io_acct()
1451 static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time)
1453 return bio_end_io_acct_remapped(bio, start_time, bio->bi_bdev);
1456 int bdev_read_only(struct block_device *bdev);
1457 int set_blocksize(struct block_device *bdev, int size);
1459 int lookup_bdev(const char *pathname, dev_t *dev);
1461 void blkdev_show(struct seq_file *seqf, off_t offset);
1463 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1464 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
1466 #define BLKDEV_MAJOR_MAX 512
1468 #define BLKDEV_MAJOR_MAX 0
1471 struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
1473 struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder);
1474 int bd_prepare_to_claim(struct block_device *bdev, void *holder);
1475 void bd_abort_claiming(struct block_device *bdev, void *holder);
1476 void blkdev_put(struct block_device *bdev, fmode_t mode);
1478 /* just for blk-cgroup, don't use elsewhere */
1479 struct block_device *blkdev_get_no_open(dev_t dev);
1480 void blkdev_put_no_open(struct block_device *bdev);
1482 struct block_device *bdev_alloc(struct gendisk *disk, u8 partno);
1483 void bdev_add(struct block_device *bdev, dev_t dev);
1484 struct block_device *I_BDEV(struct inode *inode);
1485 int truncate_bdev_range(struct block_device *bdev, fmode_t mode, loff_t lstart,
1489 void invalidate_bdev(struct block_device *bdev);
1490 int sync_blockdev(struct block_device *bdev);
1491 int sync_blockdev_range(struct block_device *bdev, loff_t lstart, loff_t lend);
1492 int sync_blockdev_nowait(struct block_device *bdev);
1493 void sync_bdevs(bool wait);
1494 void bdev_statx_dioalign(struct inode *inode, struct kstat *stat);
1495 void printk_all_partitions(void);
1497 static inline void invalidate_bdev(struct block_device *bdev)
1500 static inline int sync_blockdev(struct block_device *bdev)
1504 static inline int sync_blockdev_nowait(struct block_device *bdev)
1508 static inline void sync_bdevs(bool wait)
1511 static inline void bdev_statx_dioalign(struct inode *inode, struct kstat *stat)
1514 static inline void printk_all_partitions(void)
1517 #endif /* CONFIG_BLOCK */
1519 int fsync_bdev(struct block_device *bdev);
1521 int freeze_bdev(struct block_device *bdev);
1522 int thaw_bdev(struct block_device *bdev);
1524 struct io_comp_batch {
1525 struct request *req_list;
1527 void (*complete)(struct io_comp_batch *);
1530 #define DEFINE_IO_COMP_BATCH(name) struct io_comp_batch name = { }
1532 #endif /* _LINUX_BLKDEV_H */