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 const 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;
161 #ifdef CONFIG_BLK_DEV_ZONED
163 * Zoned block device information for request dispatch control.
164 * nr_zones is the total number of zones of the device. This is always
165 * 0 for regular block devices. conv_zones_bitmap is a bitmap of nr_zones
166 * bits which indicates if a zone is conventional (bit set) or
167 * sequential (bit clear). seq_zones_wlock is a bitmap of nr_zones
168 * bits which indicates if a zone is write locked, that is, if a write
169 * request targeting the zone was dispatched.
171 * Reads of this information must be protected with blk_queue_enter() /
172 * blk_queue_exit(). Modifying this information is only allowed while
173 * no requests are being processed. See also blk_mq_freeze_queue() and
174 * blk_mq_unfreeze_queue().
176 unsigned int nr_zones;
177 unsigned int max_open_zones;
178 unsigned int max_active_zones;
179 unsigned long *conv_zones_bitmap;
180 unsigned long *seq_zones_wlock;
181 #endif /* CONFIG_BLK_DEV_ZONED */
183 #if IS_ENABLED(CONFIG_CDROM)
184 struct cdrom_device_info *cdi;
187 struct badblocks *bb;
188 struct lockdep_map lockdep_map;
192 * Independent sector access ranges. This is always NULL for
193 * devices that do not have multiple independent access ranges.
195 struct blk_independent_access_ranges *ia_ranges;
198 static inline bool disk_live(struct gendisk *disk)
200 return !inode_unhashed(disk->part0->bd_inode);
204 * disk_openers - returns how many openers are there for a disk
205 * @disk: disk to check
207 * This returns the number of openers for a disk. Note that this value is only
208 * stable if disk->open_mutex is held.
210 * Note: Due to a quirk in the block layer open code, each open partition is
211 * only counted once even if there are multiple openers.
213 static inline unsigned int disk_openers(struct gendisk *disk)
215 return atomic_read(&disk->part0->bd_openers);
219 * The gendisk is refcounted by the part0 block_device, and the bd_device
220 * therein is also used for device model presentation in sysfs.
222 #define dev_to_disk(device) \
223 (dev_to_bdev(device)->bd_disk)
224 #define disk_to_dev(disk) \
225 (&((disk)->part0->bd_device))
227 #if IS_REACHABLE(CONFIG_CDROM)
228 #define disk_to_cdi(disk) ((disk)->cdi)
230 #define disk_to_cdi(disk) NULL
233 static inline dev_t disk_devt(struct gendisk *disk)
235 return MKDEV(disk->major, disk->first_minor);
238 static inline int blk_validate_block_size(unsigned long bsize)
240 if (bsize < 512 || bsize > PAGE_SIZE || !is_power_of_2(bsize))
246 static inline bool blk_op_is_passthrough(blk_opf_t op)
249 return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT;
253 * Zoned block device models (zoned limit).
255 * Note: This needs to be ordered from the least to the most severe
256 * restrictions for the inheritance in blk_stack_limits() to work.
258 enum blk_zoned_model {
259 BLK_ZONED_NONE = 0, /* Regular block device */
260 BLK_ZONED_HA, /* Host-aware zoned block device */
261 BLK_ZONED_HM, /* Host-managed zoned block device */
265 * BLK_BOUNCE_NONE: never bounce (default)
266 * BLK_BOUNCE_HIGH: bounce all highmem pages
273 struct queue_limits {
274 enum blk_bounce bounce;
275 unsigned long seg_boundary_mask;
276 unsigned long virt_boundary_mask;
278 unsigned int max_hw_sectors;
279 unsigned int max_dev_sectors;
280 unsigned int chunk_sectors;
281 unsigned int max_sectors;
282 unsigned int max_user_sectors;
283 unsigned int max_segment_size;
284 unsigned int physical_block_size;
285 unsigned int logical_block_size;
286 unsigned int alignment_offset;
289 unsigned int max_discard_sectors;
290 unsigned int max_hw_discard_sectors;
291 unsigned int max_secure_erase_sectors;
292 unsigned int max_write_zeroes_sectors;
293 unsigned int max_zone_append_sectors;
294 unsigned int discard_granularity;
295 unsigned int discard_alignment;
296 unsigned int zone_write_granularity;
298 unsigned short max_segments;
299 unsigned short max_integrity_segments;
300 unsigned short max_discard_segments;
302 unsigned char misaligned;
303 unsigned char discard_misaligned;
304 unsigned char raid_partial_stripes_expensive;
305 enum blk_zoned_model zoned;
308 * Drivers that set dma_alignment to less than 511 must be prepared to
309 * handle individual bvec's that are not a multiple of a SECTOR_SIZE
310 * due to possible offsets.
312 unsigned int dma_alignment;
315 typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx,
318 void disk_set_zoned(struct gendisk *disk, enum blk_zoned_model model);
320 #ifdef CONFIG_BLK_DEV_ZONED
321 #define BLK_ALL_ZONES ((unsigned int)-1)
322 int blkdev_report_zones(struct block_device *bdev, sector_t sector,
323 unsigned int nr_zones, report_zones_cb cb, void *data);
324 unsigned int bdev_nr_zones(struct block_device *bdev);
325 extern int blkdev_zone_mgmt(struct block_device *bdev, enum req_op op,
326 sector_t sectors, sector_t nr_sectors,
328 int blk_revalidate_disk_zones(struct gendisk *disk,
329 void (*update_driver_data)(struct gendisk *disk));
330 #else /* CONFIG_BLK_DEV_ZONED */
331 static inline unsigned int bdev_nr_zones(struct block_device *bdev)
335 #endif /* CONFIG_BLK_DEV_ZONED */
338 * Independent access ranges: struct blk_independent_access_range describes
339 * a range of contiguous sectors that can be accessed using device command
340 * execution resources that are independent from the resources used for
341 * other access ranges. This is typically found with single-LUN multi-actuator
342 * HDDs where each access range is served by a different set of heads.
343 * The set of independent ranges supported by the device is defined using
344 * struct blk_independent_access_ranges. The independent ranges must not overlap
345 * and must include all sectors within the disk capacity (no sector holes
347 * For a device with multiple ranges, requests targeting sectors in different
348 * ranges can be executed in parallel. A request can straddle an access range
351 struct blk_independent_access_range {
357 struct blk_independent_access_ranges {
359 bool sysfs_registered;
360 unsigned int nr_ia_ranges;
361 struct blk_independent_access_range ia_range[];
364 struct request_queue {
365 struct request *last_merge;
366 struct elevator_queue *elevator;
368 struct percpu_ref q_usage_counter;
370 struct blk_queue_stats *stats;
371 struct rq_qos *rq_qos;
372 struct mutex rq_qos_mutex;
374 const struct blk_mq_ops *mq_ops;
377 struct blk_mq_ctx __percpu *queue_ctx;
379 unsigned int queue_depth;
381 /* hw dispatch queues */
382 struct xarray hctx_table;
383 unsigned int nr_hw_queues;
386 * The queue owner gets to use this for whatever they like.
387 * ll_rw_blk doesn't touch it.
392 * various queue flags, see QUEUE_* below
394 unsigned long queue_flags;
396 * Number of contexts that have called blk_set_pm_only(). If this
397 * counter is above zero then only RQF_PM requests are processed.
402 * ida allocated id for this queue. Used to index queues from
407 spinlock_t queue_lock;
409 struct gendisk *disk;
416 struct kobject *mq_kobj;
418 #ifdef CONFIG_BLK_DEV_INTEGRITY
419 struct blk_integrity integrity;
420 #endif /* CONFIG_BLK_DEV_INTEGRITY */
424 enum rpm_status rpm_status;
430 unsigned long nr_requests; /* Max # of requests */
432 unsigned int dma_pad_mask;
434 #ifdef CONFIG_BLK_INLINE_ENCRYPTION
435 struct blk_crypto_profile *crypto_profile;
436 struct kobject *crypto_kobject;
439 unsigned int rq_timeout;
441 struct timer_list timeout;
442 struct work_struct timeout_work;
444 atomic_t nr_active_requests_shared_tags;
446 struct blk_mq_tags *sched_shared_tags;
448 struct list_head icq_list;
449 #ifdef CONFIG_BLK_CGROUP
450 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
451 struct blkcg_gq *root_blkg;
452 struct list_head blkg_list;
453 struct mutex blkcg_mutex;
456 struct queue_limits limits;
458 unsigned int required_elevator_features;
461 #ifdef CONFIG_BLK_DEV_IO_TRACE
462 struct blk_trace __rcu *blk_trace;
465 * for flush operations
467 struct blk_flush_queue *fq;
468 struct list_head flush_list;
470 struct list_head requeue_list;
471 spinlock_t requeue_lock;
472 struct delayed_work requeue_work;
474 struct mutex sysfs_lock;
475 struct mutex sysfs_dir_lock;
478 * for reusing dead hctx instance in case of updating
481 struct list_head unused_hctx_list;
482 spinlock_t unused_hctx_lock;
486 #ifdef CONFIG_BLK_DEV_THROTTLING
488 struct throtl_data *td;
490 struct rcu_head rcu_head;
491 wait_queue_head_t mq_freeze_wq;
493 * Protect concurrent access to q_usage_counter by
494 * percpu_ref_kill() and percpu_ref_reinit().
496 struct mutex mq_freeze_lock;
500 struct blk_mq_tag_set *tag_set;
501 struct list_head tag_set_list;
503 struct dentry *debugfs_dir;
504 struct dentry *sched_debugfs_dir;
505 struct dentry *rqos_debugfs_dir;
507 * Serializes all debugfs metadata operations using the above dentries.
509 struct mutex debugfs_mutex;
511 bool mq_sysfs_init_done;
514 /* Keep blk_queue_flag_name[] in sync with the definitions below */
515 #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */
516 #define QUEUE_FLAG_DYING 1 /* queue being torn down */
517 #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */
518 #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */
519 #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */
520 #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */
521 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
522 #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */
523 #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */
524 #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */
525 #define QUEUE_FLAG_SYNCHRONOUS 11 /* always completes in submit context */
526 #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */
527 #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */
528 #define QUEUE_FLAG_STABLE_WRITES 15 /* don't modify blks until WB is done */
529 #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */
530 #define QUEUE_FLAG_WC 17 /* Write back caching */
531 #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */
532 #define QUEUE_FLAG_DAX 19 /* device supports DAX */
533 #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */
534 #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */
535 #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */
536 #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */
537 #define QUEUE_FLAG_ZONE_RESETALL 26 /* supports Zone Reset All */
538 #define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */
539 #define QUEUE_FLAG_HCTX_ACTIVE 28 /* at least one blk-mq hctx is active */
540 #define QUEUE_FLAG_NOWAIT 29 /* device supports NOWAIT */
541 #define QUEUE_FLAG_SQ_SCHED 30 /* single queue style io dispatch */
542 #define QUEUE_FLAG_SKIP_TAGSET_QUIESCE 31 /* quiesce_tagset skip the queue*/
544 #define QUEUE_FLAG_MQ_DEFAULT ((1UL << QUEUE_FLAG_IO_STAT) | \
545 (1UL << QUEUE_FLAG_SAME_COMP) | \
546 (1UL << QUEUE_FLAG_NOWAIT))
548 void blk_queue_flag_set(unsigned int flag, struct request_queue *q);
549 void blk_queue_flag_clear(unsigned int flag, struct request_queue *q);
550 bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
552 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
553 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
554 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
555 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
556 #define blk_queue_noxmerges(q) \
557 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
558 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
559 #define blk_queue_stable_writes(q) \
560 test_bit(QUEUE_FLAG_STABLE_WRITES, &(q)->queue_flags)
561 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
562 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
563 #define blk_queue_zone_resetall(q) \
564 test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags)
565 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
566 #define blk_queue_pci_p2pdma(q) \
567 test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags)
568 #ifdef CONFIG_BLK_RQ_ALLOC_TIME
569 #define blk_queue_rq_alloc_time(q) \
570 test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags)
572 #define blk_queue_rq_alloc_time(q) false
575 #define blk_noretry_request(rq) \
576 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
577 REQ_FAILFAST_DRIVER))
578 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
579 #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only)
580 #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags)
581 #define blk_queue_sq_sched(q) test_bit(QUEUE_FLAG_SQ_SCHED, &(q)->queue_flags)
582 #define blk_queue_skip_tagset_quiesce(q) \
583 test_bit(QUEUE_FLAG_SKIP_TAGSET_QUIESCE, &(q)->queue_flags)
585 extern void blk_set_pm_only(struct request_queue *q);
586 extern void blk_clear_pm_only(struct request_queue *q);
588 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
590 #define dma_map_bvec(dev, bv, dir, attrs) \
591 dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \
594 static inline bool queue_is_mq(struct request_queue *q)
600 static inline enum rpm_status queue_rpm_status(struct request_queue *q)
602 return q->rpm_status;
605 static inline enum rpm_status queue_rpm_status(struct request_queue *q)
611 static inline enum blk_zoned_model
612 blk_queue_zoned_model(struct request_queue *q)
614 if (IS_ENABLED(CONFIG_BLK_DEV_ZONED))
615 return q->limits.zoned;
616 return BLK_ZONED_NONE;
619 static inline bool blk_queue_is_zoned(struct request_queue *q)
621 switch (blk_queue_zoned_model(q)) {
630 #ifdef CONFIG_BLK_DEV_ZONED
631 static inline unsigned int disk_nr_zones(struct gendisk *disk)
633 return blk_queue_is_zoned(disk->queue) ? disk->nr_zones : 0;
636 static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector)
638 if (!blk_queue_is_zoned(disk->queue))
640 return sector >> ilog2(disk->queue->limits.chunk_sectors);
643 static inline bool disk_zone_is_seq(struct gendisk *disk, sector_t sector)
645 if (!blk_queue_is_zoned(disk->queue))
647 if (!disk->conv_zones_bitmap)
649 return !test_bit(disk_zone_no(disk, sector), disk->conv_zones_bitmap);
652 static inline void disk_set_max_open_zones(struct gendisk *disk,
653 unsigned int max_open_zones)
655 disk->max_open_zones = max_open_zones;
658 static inline void disk_set_max_active_zones(struct gendisk *disk,
659 unsigned int max_active_zones)
661 disk->max_active_zones = max_active_zones;
664 static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
666 return bdev->bd_disk->max_open_zones;
669 static inline unsigned int bdev_max_active_zones(struct block_device *bdev)
671 return bdev->bd_disk->max_active_zones;
674 #else /* CONFIG_BLK_DEV_ZONED */
675 static inline unsigned int disk_nr_zones(struct gendisk *disk)
679 static inline bool disk_zone_is_seq(struct gendisk *disk, sector_t sector)
683 static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector)
687 static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
692 static inline unsigned int bdev_max_active_zones(struct block_device *bdev)
696 #endif /* CONFIG_BLK_DEV_ZONED */
698 static inline unsigned int blk_queue_depth(struct request_queue *q)
701 return q->queue_depth;
703 return q->nr_requests;
707 * default timeout for SG_IO if none specified
709 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
710 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
712 /* This should not be used directly - use rq_for_each_segment */
713 #define for_each_bio(_bio) \
714 for (; _bio; _bio = _bio->bi_next)
716 int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
717 const struct attribute_group **groups);
718 static inline int __must_check add_disk(struct gendisk *disk)
720 return device_add_disk(NULL, disk, NULL);
722 void del_gendisk(struct gendisk *gp);
723 void invalidate_disk(struct gendisk *disk);
724 void set_disk_ro(struct gendisk *disk, bool read_only);
725 void disk_uevent(struct gendisk *disk, enum kobject_action action);
727 static inline int get_disk_ro(struct gendisk *disk)
729 return disk->part0->bd_read_only ||
730 test_bit(GD_READ_ONLY, &disk->state);
733 static inline int bdev_read_only(struct block_device *bdev)
735 return bdev->bd_read_only || get_disk_ro(bdev->bd_disk);
738 bool set_capacity_and_notify(struct gendisk *disk, sector_t size);
739 bool disk_force_media_change(struct gendisk *disk, unsigned int events);
741 void add_disk_randomness(struct gendisk *disk) __latent_entropy;
742 void rand_initialize_disk(struct gendisk *disk);
744 static inline sector_t get_start_sect(struct block_device *bdev)
746 return bdev->bd_start_sect;
749 static inline sector_t bdev_nr_sectors(struct block_device *bdev)
751 return bdev->bd_nr_sectors;
754 static inline loff_t bdev_nr_bytes(struct block_device *bdev)
756 return (loff_t)bdev_nr_sectors(bdev) << SECTOR_SHIFT;
759 static inline sector_t get_capacity(struct gendisk *disk)
761 return bdev_nr_sectors(disk->part0);
764 static inline u64 sb_bdev_nr_blocks(struct super_block *sb)
766 return bdev_nr_sectors(sb->s_bdev) >>
767 (sb->s_blocksize_bits - SECTOR_SHIFT);
770 int bdev_disk_changed(struct gendisk *disk, bool invalidate);
772 void put_disk(struct gendisk *disk);
773 struct gendisk *__blk_alloc_disk(int node, struct lock_class_key *lkclass);
776 * blk_alloc_disk - allocate a gendisk structure
777 * @node_id: numa node to allocate on
779 * Allocate and pre-initialize a gendisk structure for use with BIO based
784 #define blk_alloc_disk(node_id) \
786 static struct lock_class_key __key; \
788 __blk_alloc_disk(node_id, &__key); \
791 int __register_blkdev(unsigned int major, const char *name,
792 void (*probe)(dev_t devt));
793 #define register_blkdev(major, name) \
794 __register_blkdev(major, name, NULL)
795 void unregister_blkdev(unsigned int major, const char *name);
797 bool disk_check_media_change(struct gendisk *disk);
798 int __invalidate_device(struct block_device *bdev, bool kill_dirty);
799 void set_capacity(struct gendisk *disk, sector_t size);
801 #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED
802 int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
803 void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk);
805 static inline int bd_link_disk_holder(struct block_device *bdev,
806 struct gendisk *disk)
810 static inline void bd_unlink_disk_holder(struct block_device *bdev,
811 struct gendisk *disk)
814 #endif /* CONFIG_BLOCK_HOLDER_DEPRECATED */
816 dev_t part_devt(struct gendisk *disk, u8 partno);
817 void inc_diskseq(struct gendisk *disk);
818 void blk_request_module(dev_t devt);
820 extern int blk_register_queue(struct gendisk *disk);
821 extern void blk_unregister_queue(struct gendisk *disk);
822 void submit_bio_noacct(struct bio *bio);
823 struct bio *bio_split_to_limits(struct bio *bio);
825 extern int blk_lld_busy(struct request_queue *q);
826 extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags);
827 extern void blk_queue_exit(struct request_queue *q);
828 extern void blk_sync_queue(struct request_queue *q);
830 /* Helper to convert REQ_OP_XXX to its string format XXX */
831 extern const char *blk_op_str(enum req_op op);
833 int blk_status_to_errno(blk_status_t status);
834 blk_status_t errno_to_blk_status(int errno);
836 /* only poll the hardware once, don't continue until a completion was found */
837 #define BLK_POLL_ONESHOT (1 << 0)
838 int bio_poll(struct bio *bio, struct io_comp_batch *iob, unsigned int flags);
839 int iocb_bio_iopoll(struct kiocb *kiocb, struct io_comp_batch *iob,
842 static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
844 return bdev->bd_queue; /* this is never NULL */
847 /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */
848 const char *blk_zone_cond_str(enum blk_zone_cond zone_cond);
850 static inline unsigned int bio_zone_no(struct bio *bio)
852 return disk_zone_no(bio->bi_bdev->bd_disk, bio->bi_iter.bi_sector);
855 static inline unsigned int bio_zone_is_seq(struct bio *bio)
857 return disk_zone_is_seq(bio->bi_bdev->bd_disk, bio->bi_iter.bi_sector);
861 * Return how much of the chunk is left to be used for I/O at a given offset.
863 static inline unsigned int blk_chunk_sectors_left(sector_t offset,
864 unsigned int chunk_sectors)
866 if (unlikely(!is_power_of_2(chunk_sectors)))
867 return chunk_sectors - sector_div(offset, chunk_sectors);
868 return chunk_sectors - (offset & (chunk_sectors - 1));
872 * Access functions for manipulating queue properties
874 void blk_queue_bounce_limit(struct request_queue *q, enum blk_bounce limit);
875 extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
876 extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
877 extern void blk_queue_max_segments(struct request_queue *, unsigned short);
878 extern void blk_queue_max_discard_segments(struct request_queue *,
880 void blk_queue_max_secure_erase_sectors(struct request_queue *q,
881 unsigned int max_sectors);
882 extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
883 extern void blk_queue_max_discard_sectors(struct request_queue *q,
884 unsigned int max_discard_sectors);
885 extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
886 unsigned int max_write_same_sectors);
887 extern void blk_queue_logical_block_size(struct request_queue *, unsigned int);
888 extern void blk_queue_max_zone_append_sectors(struct request_queue *q,
889 unsigned int max_zone_append_sectors);
890 extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
891 void blk_queue_zone_write_granularity(struct request_queue *q,
893 extern void blk_queue_alignment_offset(struct request_queue *q,
894 unsigned int alignment);
895 void disk_update_readahead(struct gendisk *disk);
896 extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
897 extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
898 extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
899 extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
900 extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
901 extern void blk_set_stacking_limits(struct queue_limits *lim);
902 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
904 extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
906 extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
907 extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
908 extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
909 extern void blk_queue_dma_alignment(struct request_queue *, int);
910 extern void blk_queue_update_dma_alignment(struct request_queue *, int);
911 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
912 extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
914 struct blk_independent_access_ranges *
915 disk_alloc_independent_access_ranges(struct gendisk *disk, int nr_ia_ranges);
916 void disk_set_independent_access_ranges(struct gendisk *disk,
917 struct blk_independent_access_ranges *iars);
920 * Elevator features for blk_queue_required_elevator_features:
922 /* Supports zoned block devices sequential write constraint */
923 #define ELEVATOR_F_ZBD_SEQ_WRITE (1U << 0)
925 extern void blk_queue_required_elevator_features(struct request_queue *q,
926 unsigned int features);
927 extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q,
930 bool __must_check blk_get_queue(struct request_queue *);
931 extern void blk_put_queue(struct request_queue *);
933 void blk_mark_disk_dead(struct gendisk *disk);
937 * blk_plug permits building a queue of related requests by holding the I/O
938 * fragments for a short period. This allows merging of sequential requests
939 * into single larger request. As the requests are moved from a per-task list to
940 * the device's request_queue in a batch, this results in improved scalability
941 * as the lock contention for request_queue lock is reduced.
943 * It is ok not to disable preemption when adding the request to the plug list
944 * or when attempting a merge. For details, please see schedule() where
945 * blk_flush_plug() is called.
948 struct request *mq_list; /* blk-mq requests */
950 /* if ios_left is > 1, we can batch tag/rq allocations */
951 struct request *cached_rq;
952 unsigned short nr_ios;
954 unsigned short rq_count;
956 bool multiple_queues;
960 struct list_head cb_list; /* md requires an unplug callback */
964 typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
966 struct list_head list;
967 blk_plug_cb_fn callback;
970 extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
971 void *data, int size);
972 extern void blk_start_plug(struct blk_plug *);
973 extern void blk_start_plug_nr_ios(struct blk_plug *, unsigned short);
974 extern void blk_finish_plug(struct blk_plug *);
976 void __blk_flush_plug(struct blk_plug *plug, bool from_schedule);
977 static inline void blk_flush_plug(struct blk_plug *plug, bool async)
980 __blk_flush_plug(plug, async);
983 int blkdev_issue_flush(struct block_device *bdev);
984 long nr_blockdev_pages(void);
985 #else /* CONFIG_BLOCK */
989 static inline void blk_start_plug_nr_ios(struct blk_plug *plug,
990 unsigned short nr_ios)
994 static inline void blk_start_plug(struct blk_plug *plug)
998 static inline void blk_finish_plug(struct blk_plug *plug)
1002 static inline void blk_flush_plug(struct blk_plug *plug, bool async)
1006 static inline int blkdev_issue_flush(struct block_device *bdev)
1011 static inline long nr_blockdev_pages(void)
1015 #endif /* CONFIG_BLOCK */
1017 extern void blk_io_schedule(void);
1019 int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1020 sector_t nr_sects, gfp_t gfp_mask);
1021 int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1022 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop);
1023 int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector,
1024 sector_t nr_sects, gfp_t gfp);
1026 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
1027 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
1029 extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1030 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
1032 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1033 sector_t nr_sects, gfp_t gfp_mask, unsigned flags);
1035 static inline int sb_issue_discard(struct super_block *sb, sector_t block,
1036 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
1038 return blkdev_issue_discard(sb->s_bdev,
1039 block << (sb->s_blocksize_bits -
1041 nr_blocks << (sb->s_blocksize_bits -
1045 static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
1046 sector_t nr_blocks, gfp_t gfp_mask)
1048 return blkdev_issue_zeroout(sb->s_bdev,
1049 block << (sb->s_blocksize_bits -
1051 nr_blocks << (sb->s_blocksize_bits -
1056 static inline bool bdev_is_partition(struct block_device *bdev)
1058 return bdev->bd_partno;
1061 enum blk_default_limits {
1062 BLK_MAX_SEGMENTS = 128,
1063 BLK_SAFE_MAX_SECTORS = 255,
1064 BLK_MAX_SEGMENT_SIZE = 65536,
1065 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
1068 #define BLK_DEF_MAX_SECTORS 2560u
1070 static inline unsigned long queue_segment_boundary(const struct request_queue *q)
1072 return q->limits.seg_boundary_mask;
1075 static inline unsigned long queue_virt_boundary(const struct request_queue *q)
1077 return q->limits.virt_boundary_mask;
1080 static inline unsigned int queue_max_sectors(const struct request_queue *q)
1082 return q->limits.max_sectors;
1085 static inline unsigned int queue_max_bytes(struct request_queue *q)
1087 return min_t(unsigned int, queue_max_sectors(q), INT_MAX >> 9) << 9;
1090 static inline unsigned int queue_max_hw_sectors(const struct request_queue *q)
1092 return q->limits.max_hw_sectors;
1095 static inline unsigned short queue_max_segments(const struct request_queue *q)
1097 return q->limits.max_segments;
1100 static inline unsigned short queue_max_discard_segments(const struct request_queue *q)
1102 return q->limits.max_discard_segments;
1105 static inline unsigned int queue_max_segment_size(const struct request_queue *q)
1107 return q->limits.max_segment_size;
1110 static inline unsigned int queue_max_zone_append_sectors(const struct request_queue *q)
1113 const struct queue_limits *l = &q->limits;
1115 return min(l->max_zone_append_sectors, l->max_sectors);
1118 static inline unsigned int
1119 bdev_max_zone_append_sectors(struct block_device *bdev)
1121 return queue_max_zone_append_sectors(bdev_get_queue(bdev));
1124 static inline unsigned int bdev_max_segments(struct block_device *bdev)
1126 return queue_max_segments(bdev_get_queue(bdev));
1129 static inline unsigned queue_logical_block_size(const struct request_queue *q)
1133 if (q && q->limits.logical_block_size)
1134 retval = q->limits.logical_block_size;
1139 static inline unsigned int bdev_logical_block_size(struct block_device *bdev)
1141 return queue_logical_block_size(bdev_get_queue(bdev));
1144 static inline unsigned int queue_physical_block_size(const struct request_queue *q)
1146 return q->limits.physical_block_size;
1149 static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
1151 return queue_physical_block_size(bdev_get_queue(bdev));
1154 static inline unsigned int queue_io_min(const struct request_queue *q)
1156 return q->limits.io_min;
1159 static inline int bdev_io_min(struct block_device *bdev)
1161 return queue_io_min(bdev_get_queue(bdev));
1164 static inline unsigned int queue_io_opt(const struct request_queue *q)
1166 return q->limits.io_opt;
1169 static inline int bdev_io_opt(struct block_device *bdev)
1171 return queue_io_opt(bdev_get_queue(bdev));
1174 static inline unsigned int
1175 queue_zone_write_granularity(const struct request_queue *q)
1177 return q->limits.zone_write_granularity;
1180 static inline unsigned int
1181 bdev_zone_write_granularity(struct block_device *bdev)
1183 return queue_zone_write_granularity(bdev_get_queue(bdev));
1186 int bdev_alignment_offset(struct block_device *bdev);
1187 unsigned int bdev_discard_alignment(struct block_device *bdev);
1189 static inline unsigned int bdev_max_discard_sectors(struct block_device *bdev)
1191 return bdev_get_queue(bdev)->limits.max_discard_sectors;
1194 static inline unsigned int bdev_discard_granularity(struct block_device *bdev)
1196 return bdev_get_queue(bdev)->limits.discard_granularity;
1199 static inline unsigned int
1200 bdev_max_secure_erase_sectors(struct block_device *bdev)
1202 return bdev_get_queue(bdev)->limits.max_secure_erase_sectors;
1205 static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
1207 struct request_queue *q = bdev_get_queue(bdev);
1210 return q->limits.max_write_zeroes_sectors;
1215 static inline bool bdev_nonrot(struct block_device *bdev)
1217 return blk_queue_nonrot(bdev_get_queue(bdev));
1220 static inline bool bdev_synchronous(struct block_device *bdev)
1222 return test_bit(QUEUE_FLAG_SYNCHRONOUS,
1223 &bdev_get_queue(bdev)->queue_flags);
1226 static inline bool bdev_stable_writes(struct block_device *bdev)
1228 return test_bit(QUEUE_FLAG_STABLE_WRITES,
1229 &bdev_get_queue(bdev)->queue_flags);
1232 static inline bool bdev_write_cache(struct block_device *bdev)
1234 return test_bit(QUEUE_FLAG_WC, &bdev_get_queue(bdev)->queue_flags);
1237 static inline bool bdev_fua(struct block_device *bdev)
1239 return test_bit(QUEUE_FLAG_FUA, &bdev_get_queue(bdev)->queue_flags);
1242 static inline bool bdev_nowait(struct block_device *bdev)
1244 return test_bit(QUEUE_FLAG_NOWAIT, &bdev_get_queue(bdev)->queue_flags);
1247 static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev)
1249 return blk_queue_zoned_model(bdev_get_queue(bdev));
1252 static inline bool bdev_is_zoned(struct block_device *bdev)
1254 return blk_queue_is_zoned(bdev_get_queue(bdev));
1257 static inline unsigned int bdev_zone_no(struct block_device *bdev, sector_t sec)
1259 return disk_zone_no(bdev->bd_disk, sec);
1262 /* Whether write serialization is required for @op on zoned devices. */
1263 static inline bool op_needs_zoned_write_locking(enum req_op op)
1265 return op == REQ_OP_WRITE || op == REQ_OP_WRITE_ZEROES;
1268 static inline bool bdev_op_is_zoned_write(struct block_device *bdev,
1271 return bdev_is_zoned(bdev) && op_needs_zoned_write_locking(op);
1274 static inline sector_t bdev_zone_sectors(struct block_device *bdev)
1276 struct request_queue *q = bdev_get_queue(bdev);
1278 if (!blk_queue_is_zoned(q))
1280 return q->limits.chunk_sectors;
1283 static inline sector_t bdev_offset_from_zone_start(struct block_device *bdev,
1286 return sector & (bdev_zone_sectors(bdev) - 1);
1289 static inline bool bdev_is_zone_start(struct block_device *bdev,
1292 return bdev_offset_from_zone_start(bdev, sector) == 0;
1295 static inline int queue_dma_alignment(const struct request_queue *q)
1297 return q ? q->limits.dma_alignment : 511;
1300 static inline unsigned int bdev_dma_alignment(struct block_device *bdev)
1302 return queue_dma_alignment(bdev_get_queue(bdev));
1305 static inline bool bdev_iter_is_aligned(struct block_device *bdev,
1306 struct iov_iter *iter)
1308 return iov_iter_is_aligned(iter, bdev_dma_alignment(bdev),
1309 bdev_logical_block_size(bdev) - 1);
1312 static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
1315 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
1316 return !(addr & alignment) && !(len & alignment);
1319 /* assumes size > 256 */
1320 static inline unsigned int blksize_bits(unsigned int size)
1322 return order_base_2(size >> SECTOR_SHIFT) + SECTOR_SHIFT;
1325 static inline unsigned int block_size(struct block_device *bdev)
1327 return 1 << bdev->bd_inode->i_blkbits;
1330 int kblockd_schedule_work(struct work_struct *work);
1331 int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
1333 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1334 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1335 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1336 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1338 #ifdef CONFIG_BLK_INLINE_ENCRYPTION
1340 bool blk_crypto_register(struct blk_crypto_profile *profile,
1341 struct request_queue *q);
1343 #else /* CONFIG_BLK_INLINE_ENCRYPTION */
1345 static inline bool blk_crypto_register(struct blk_crypto_profile *profile,
1346 struct request_queue *q)
1351 #endif /* CONFIG_BLK_INLINE_ENCRYPTION */
1353 enum blk_unique_id {
1354 /* these match the Designator Types specified in SPC */
1360 #define NFL4_UFLG_MASK 0x0000003F
1362 struct block_device_operations {
1363 void (*submit_bio)(struct bio *bio);
1364 int (*poll_bio)(struct bio *bio, struct io_comp_batch *iob,
1365 unsigned int flags);
1366 int (*open)(struct gendisk *disk, fmode_t mode);
1367 void (*release)(struct gendisk *disk);
1368 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1369 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1370 unsigned int (*check_events) (struct gendisk *disk,
1371 unsigned int clearing);
1372 void (*unlock_native_capacity) (struct gendisk *);
1373 int (*getgeo)(struct block_device *, struct hd_geometry *);
1374 int (*set_read_only)(struct block_device *bdev, bool ro);
1375 void (*free_disk)(struct gendisk *disk);
1376 /* this callback is with swap_lock and sometimes page table lock held */
1377 void (*swap_slot_free_notify) (struct block_device *, unsigned long);
1378 int (*report_zones)(struct gendisk *, sector_t sector,
1379 unsigned int nr_zones, report_zones_cb cb, void *data);
1380 char *(*devnode)(struct gendisk *disk, umode_t *mode);
1381 /* returns the length of the identifier or a negative errno: */
1382 int (*get_unique_id)(struct gendisk *disk, u8 id[16],
1383 enum blk_unique_id id_type);
1384 struct module *owner;
1385 const struct pr_ops *pr_ops;
1388 * Special callback for probing GPT entry at a given sector.
1389 * Needed by Android devices, used by GPT scanner and MMC blk
1392 int (*alternative_gpt_sector)(struct gendisk *disk, sector_t *sector);
1395 #ifdef CONFIG_COMPAT
1396 extern int blkdev_compat_ptr_ioctl(struct block_device *, fmode_t,
1397 unsigned int, unsigned long);
1399 #define blkdev_compat_ptr_ioctl NULL
1402 static inline void blk_wake_io_task(struct task_struct *waiter)
1405 * If we're polling, the task itself is doing the completions. For
1406 * that case, we don't need to signal a wakeup, it's enough to just
1407 * mark us as RUNNING.
1409 if (waiter == current)
1410 __set_current_state(TASK_RUNNING);
1412 wake_up_process(waiter);
1415 unsigned long bdev_start_io_acct(struct block_device *bdev, enum req_op op,
1416 unsigned long start_time);
1417 void bdev_end_io_acct(struct block_device *bdev, enum req_op op,
1418 unsigned int sectors, unsigned long start_time);
1420 unsigned long bio_start_io_acct(struct bio *bio);
1421 void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time,
1422 struct block_device *orig_bdev);
1425 * bio_end_io_acct - end I/O accounting for bio based drivers
1426 * @bio: bio to end account for
1427 * @start_time: start time returned by bio_start_io_acct()
1429 static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time)
1431 return bio_end_io_acct_remapped(bio, start_time, bio->bi_bdev);
1434 int bdev_read_only(struct block_device *bdev);
1435 int set_blocksize(struct block_device *bdev, int size);
1437 int lookup_bdev(const char *pathname, dev_t *dev);
1439 void blkdev_show(struct seq_file *seqf, off_t offset);
1441 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1442 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
1444 #define BLKDEV_MAJOR_MAX 512
1446 #define BLKDEV_MAJOR_MAX 0
1449 struct blk_holder_ops {
1450 void (*mark_dead)(struct block_device *bdev);
1454 * Return the correct open flags for blkdev_get_by_* for super block flags
1455 * as stored in sb->s_flags.
1457 #define sb_open_mode(flags) \
1458 (FMODE_READ | (((flags) & SB_RDONLY) ? 0 : FMODE_WRITE))
1460 struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder,
1461 const struct blk_holder_ops *hops);
1462 struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
1463 void *holder, const struct blk_holder_ops *hops);
1464 int bd_prepare_to_claim(struct block_device *bdev, void *holder,
1465 const struct blk_holder_ops *hops);
1466 void bd_abort_claiming(struct block_device *bdev, void *holder);
1467 void blkdev_put(struct block_device *bdev, void *holder);
1469 /* just for blk-cgroup, don't use elsewhere */
1470 struct block_device *blkdev_get_no_open(dev_t dev);
1471 void blkdev_put_no_open(struct block_device *bdev);
1473 struct block_device *I_BDEV(struct inode *inode);
1476 void invalidate_bdev(struct block_device *bdev);
1477 int sync_blockdev(struct block_device *bdev);
1478 int sync_blockdev_range(struct block_device *bdev, loff_t lstart, loff_t lend);
1479 int sync_blockdev_nowait(struct block_device *bdev);
1480 void sync_bdevs(bool wait);
1481 void bdev_statx_dioalign(struct inode *inode, struct kstat *stat);
1482 void printk_all_partitions(void);
1483 int __init early_lookup_bdev(const char *pathname, dev_t *dev);
1485 static inline void invalidate_bdev(struct block_device *bdev)
1488 static inline int sync_blockdev(struct block_device *bdev)
1492 static inline int sync_blockdev_nowait(struct block_device *bdev)
1496 static inline void sync_bdevs(bool wait)
1499 static inline void bdev_statx_dioalign(struct inode *inode, struct kstat *stat)
1502 static inline void printk_all_partitions(void)
1505 static inline int early_lookup_bdev(const char *pathname, dev_t *dev)
1509 #endif /* CONFIG_BLOCK */
1511 int fsync_bdev(struct block_device *bdev);
1513 int freeze_bdev(struct block_device *bdev);
1514 int thaw_bdev(struct block_device *bdev);
1516 struct io_comp_batch {
1517 struct request *req_list;
1519 void (*complete)(struct io_comp_batch *);
1522 #define DEFINE_IO_COMP_BATCH(name) struct io_comp_batch name = { }
1524 #endif /* _LINUX_BLKDEV_H */