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;
145 #define GD_NEED_PART_SCAN 0
146 #define GD_READ_ONLY 1
148 #define GD_NATIVE_CAPACITY 3
150 #define GD_SUPPRESS_PART_SCAN 5
151 #define GD_OWNS_QUEUE 6
153 struct mutex open_mutex; /* open/close mutex */
154 unsigned open_partitions; /* number of open partitions */
156 struct backing_dev_info *bdi;
157 struct kobject *slave_dir;
158 #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED
159 struct list_head slave_bdevs;
161 struct timer_rand_state *random;
162 atomic_t sync_io; /* RAID */
163 struct disk_events *ev;
164 #ifdef CONFIG_BLK_DEV_INTEGRITY
165 struct kobject integrity_kobj;
166 #endif /* CONFIG_BLK_DEV_INTEGRITY */
167 #if IS_ENABLED(CONFIG_CDROM)
168 struct cdrom_device_info *cdi;
171 struct badblocks *bb;
172 struct lockdep_map lockdep_map;
176 * Independent sector access ranges. This is always NULL for
177 * devices that do not have multiple independent access ranges.
179 struct blk_independent_access_ranges *ia_ranges;
182 static inline bool disk_live(struct gendisk *disk)
184 return !inode_unhashed(disk->part0->bd_inode);
188 * disk_openers - returns how many openers are there for a disk
189 * @disk: disk to check
191 * This returns the number of openers for a disk. Note that this value is only
192 * stable if disk->open_mutex is held.
194 * Note: Due to a quirk in the block layer open code, each open partition is
195 * only counted once even if there are multiple openers.
197 static inline unsigned int disk_openers(struct gendisk *disk)
199 return atomic_read(&disk->part0->bd_openers);
203 * The gendisk is refcounted by the part0 block_device, and the bd_device
204 * therein is also used for device model presentation in sysfs.
206 #define dev_to_disk(device) \
207 (dev_to_bdev(device)->bd_disk)
208 #define disk_to_dev(disk) \
209 (&((disk)->part0->bd_device))
211 #if IS_REACHABLE(CONFIG_CDROM)
212 #define disk_to_cdi(disk) ((disk)->cdi)
214 #define disk_to_cdi(disk) NULL
217 static inline dev_t disk_devt(struct gendisk *disk)
219 return MKDEV(disk->major, disk->first_minor);
222 static inline int blk_validate_block_size(unsigned long bsize)
224 if (bsize < 512 || bsize > PAGE_SIZE || !is_power_of_2(bsize))
230 static inline bool blk_op_is_passthrough(unsigned int op)
233 return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT;
237 * Zoned block device models (zoned limit).
239 * Note: This needs to be ordered from the least to the most severe
240 * restrictions for the inheritance in blk_stack_limits() to work.
242 enum blk_zoned_model {
243 BLK_ZONED_NONE = 0, /* Regular block device */
244 BLK_ZONED_HA, /* Host-aware zoned block device */
245 BLK_ZONED_HM, /* Host-managed zoned block device */
249 * BLK_BOUNCE_NONE: never bounce (default)
250 * BLK_BOUNCE_HIGH: bounce all highmem pages
257 struct queue_limits {
258 enum blk_bounce bounce;
259 unsigned long seg_boundary_mask;
260 unsigned long virt_boundary_mask;
262 unsigned int max_hw_sectors;
263 unsigned int max_dev_sectors;
264 unsigned int chunk_sectors;
265 unsigned int max_sectors;
266 unsigned int max_segment_size;
267 unsigned int physical_block_size;
268 unsigned int logical_block_size;
269 unsigned int alignment_offset;
272 unsigned int max_discard_sectors;
273 unsigned int max_hw_discard_sectors;
274 unsigned int max_secure_erase_sectors;
275 unsigned int max_write_zeroes_sectors;
276 unsigned int max_zone_append_sectors;
277 unsigned int discard_granularity;
278 unsigned int discard_alignment;
279 unsigned int zone_write_granularity;
281 unsigned short max_segments;
282 unsigned short max_integrity_segments;
283 unsigned short max_discard_segments;
285 unsigned char misaligned;
286 unsigned char discard_misaligned;
287 unsigned char raid_partial_stripes_expensive;
288 enum blk_zoned_model zoned;
291 typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx,
294 void disk_set_zoned(struct gendisk *disk, enum blk_zoned_model model);
296 #ifdef CONFIG_BLK_DEV_ZONED
298 #define BLK_ALL_ZONES ((unsigned int)-1)
299 int blkdev_report_zones(struct block_device *bdev, sector_t sector,
300 unsigned int nr_zones, report_zones_cb cb, void *data);
301 unsigned int blkdev_nr_zones(struct gendisk *disk);
302 extern int blkdev_zone_mgmt(struct block_device *bdev, enum req_opf op,
303 sector_t sectors, sector_t nr_sectors,
305 int blk_revalidate_disk_zones(struct gendisk *disk,
306 void (*update_driver_data)(struct gendisk *disk));
308 extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
309 unsigned int cmd, unsigned long arg);
310 extern int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode,
311 unsigned int cmd, unsigned long arg);
313 #else /* CONFIG_BLK_DEV_ZONED */
315 static inline unsigned int blkdev_nr_zones(struct gendisk *disk)
320 static inline int blkdev_report_zones_ioctl(struct block_device *bdev,
321 fmode_t mode, unsigned int cmd,
327 static inline int blkdev_zone_mgmt_ioctl(struct block_device *bdev,
328 fmode_t mode, unsigned int cmd,
334 #endif /* CONFIG_BLK_DEV_ZONED */
337 * Independent access ranges: struct blk_independent_access_range describes
338 * a range of contiguous sectors that can be accessed using device command
339 * execution resources that are independent from the resources used for
340 * other access ranges. This is typically found with single-LUN multi-actuator
341 * HDDs where each access range is served by a different set of heads.
342 * The set of independent ranges supported by the device is defined using
343 * struct blk_independent_access_ranges. The independent ranges must not overlap
344 * and must include all sectors within the disk capacity (no sector holes
346 * For a device with multiple ranges, requests targeting sectors in different
347 * ranges can be executed in parallel. A request can straddle an access range
350 struct blk_independent_access_range {
356 struct blk_independent_access_ranges {
358 bool sysfs_registered;
359 unsigned int nr_ia_ranges;
360 struct blk_independent_access_range ia_range[];
363 struct request_queue {
364 struct request *last_merge;
365 struct elevator_queue *elevator;
367 struct percpu_ref q_usage_counter;
369 struct blk_queue_stats *stats;
370 struct rq_qos *rq_qos;
372 const struct blk_mq_ops *mq_ops;
375 struct blk_mq_ctx __percpu *queue_ctx;
377 unsigned int queue_depth;
379 /* hw dispatch queues */
380 struct xarray hctx_table;
381 unsigned int nr_hw_queues;
384 * The queue owner gets to use this for whatever they like.
385 * ll_rw_blk doesn't touch it.
390 * various queue flags, see QUEUE_* below
392 unsigned long queue_flags;
394 * Number of contexts that have called blk_set_pm_only(). If this
395 * counter is above zero then only RQF_PM requests are processed.
400 * ida allocated id for this queue. Used to index queues from
405 spinlock_t queue_lock;
407 struct gendisk *disk;
417 struct kobject *mq_kobj;
419 #ifdef CONFIG_BLK_DEV_INTEGRITY
420 struct blk_integrity integrity;
421 #endif /* CONFIG_BLK_DEV_INTEGRITY */
425 enum rpm_status rpm_status;
431 unsigned long nr_requests; /* Max # of requests */
433 unsigned int dma_pad_mask;
435 * Drivers that set dma_alignment to less than 511 must be prepared to
436 * handle individual bvec's that are not a multiple of a SECTOR_SIZE
437 * due to possible offsets.
439 unsigned int dma_alignment;
441 #ifdef CONFIG_BLK_INLINE_ENCRYPTION
442 struct blk_crypto_profile *crypto_profile;
443 struct kobject *crypto_kobject;
446 unsigned int rq_timeout;
449 struct blk_stat_callback *poll_cb;
450 struct blk_rq_stat *poll_stat;
452 struct timer_list timeout;
453 struct work_struct timeout_work;
455 atomic_t nr_active_requests_shared_tags;
457 struct blk_mq_tags *sched_shared_tags;
459 struct list_head icq_list;
460 #ifdef CONFIG_BLK_CGROUP
461 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
462 struct blkcg_gq *root_blkg;
463 struct list_head blkg_list;
466 struct queue_limits limits;
468 unsigned int required_elevator_features;
470 #ifdef CONFIG_BLK_DEV_ZONED
472 * Zoned block device information for request dispatch control.
473 * nr_zones is the total number of zones of the device. This is always
474 * 0 for regular block devices. conv_zones_bitmap is a bitmap of nr_zones
475 * bits which indicates if a zone is conventional (bit set) or
476 * sequential (bit clear). seq_zones_wlock is a bitmap of nr_zones
477 * bits which indicates if a zone is write locked, that is, if a write
478 * request targeting the zone was dispatched. All three fields are
479 * initialized by the low level device driver (e.g. scsi/sd.c).
480 * Stacking drivers (device mappers) may or may not initialize
483 * Reads of this information must be protected with blk_queue_enter() /
484 * blk_queue_exit(). Modifying this information is only allowed while
485 * no requests are being processed. See also blk_mq_freeze_queue() and
486 * blk_mq_unfreeze_queue().
488 unsigned int nr_zones;
489 unsigned long *conv_zones_bitmap;
490 unsigned long *seq_zones_wlock;
491 unsigned int max_open_zones;
492 unsigned int max_active_zones;
493 #endif /* CONFIG_BLK_DEV_ZONED */
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;
536 struct bio_set bio_split;
538 struct dentry *debugfs_dir;
539 struct dentry *sched_debugfs_dir;
540 struct dentry *rqos_debugfs_dir;
542 * Serializes all debugfs metadata operations using the above dentries.
544 struct mutex debugfs_mutex;
546 bool mq_sysfs_init_done;
549 * @srcu: Sleepable RCU. Use as lock when type of the request queue
550 * is blocking (BLK_MQ_F_BLOCKING). Must be the last member
552 struct srcu_struct srcu[];
555 /* Keep blk_queue_flag_name[] in sync with the definitions below */
556 #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */
557 #define QUEUE_FLAG_DYING 1 /* queue being torn down */
558 #define QUEUE_FLAG_HAS_SRCU 2 /* SRCU is allocated */
559 #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */
560 #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */
561 #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */
562 #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */
563 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
564 #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */
565 #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */
566 #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */
567 #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */
568 #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */
569 #define QUEUE_FLAG_STABLE_WRITES 15 /* don't modify blks until WB is done */
570 #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */
571 #define QUEUE_FLAG_WC 17 /* Write back caching */
572 #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */
573 #define QUEUE_FLAG_DAX 19 /* device supports DAX */
574 #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */
575 #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */
576 #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */
577 #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */
578 #define QUEUE_FLAG_ZONE_RESETALL 26 /* supports Zone Reset All */
579 #define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */
580 #define QUEUE_FLAG_HCTX_ACTIVE 28 /* at least one blk-mq hctx is active */
581 #define QUEUE_FLAG_NOWAIT 29 /* device supports NOWAIT */
582 #define QUEUE_FLAG_SQ_SCHED 30 /* single queue style io dispatch */
584 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
585 (1 << QUEUE_FLAG_SAME_COMP) | \
586 (1 << QUEUE_FLAG_NOWAIT))
588 void blk_queue_flag_set(unsigned int flag, struct request_queue *q);
589 void blk_queue_flag_clear(unsigned int flag, struct request_queue *q);
590 bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
592 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
593 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
594 #define blk_queue_has_srcu(q) test_bit(QUEUE_FLAG_HAS_SRCU, &(q)->queue_flags)
595 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
596 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
597 #define blk_queue_noxmerges(q) \
598 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
599 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
600 #define blk_queue_stable_writes(q) \
601 test_bit(QUEUE_FLAG_STABLE_WRITES, &(q)->queue_flags)
602 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
603 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
604 #define blk_queue_zone_resetall(q) \
605 test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags)
606 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
607 #define blk_queue_pci_p2pdma(q) \
608 test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags)
609 #ifdef CONFIG_BLK_RQ_ALLOC_TIME
610 #define blk_queue_rq_alloc_time(q) \
611 test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags)
613 #define blk_queue_rq_alloc_time(q) false
616 #define blk_noretry_request(rq) \
617 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
618 REQ_FAILFAST_DRIVER))
619 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
620 #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only)
621 #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags)
622 #define blk_queue_nowait(q) test_bit(QUEUE_FLAG_NOWAIT, &(q)->queue_flags)
623 #define blk_queue_sq_sched(q) test_bit(QUEUE_FLAG_SQ_SCHED, &(q)->queue_flags)
625 extern void blk_set_pm_only(struct request_queue *q);
626 extern void blk_clear_pm_only(struct request_queue *q);
628 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
630 #define dma_map_bvec(dev, bv, dir, attrs) \
631 dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \
634 static inline bool queue_is_mq(struct request_queue *q)
640 static inline enum rpm_status queue_rpm_status(struct request_queue *q)
642 return q->rpm_status;
645 static inline enum rpm_status queue_rpm_status(struct request_queue *q)
651 static inline enum blk_zoned_model
652 blk_queue_zoned_model(struct request_queue *q)
654 if (IS_ENABLED(CONFIG_BLK_DEV_ZONED))
655 return q->limits.zoned;
656 return BLK_ZONED_NONE;
659 static inline bool blk_queue_is_zoned(struct request_queue *q)
661 switch (blk_queue_zoned_model(q)) {
670 static inline sector_t blk_queue_zone_sectors(struct request_queue *q)
672 return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0;
675 #ifdef CONFIG_BLK_DEV_ZONED
676 static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
678 return blk_queue_is_zoned(q) ? q->nr_zones : 0;
681 static inline unsigned int blk_queue_zone_no(struct request_queue *q,
684 if (!blk_queue_is_zoned(q))
686 return sector >> ilog2(q->limits.chunk_sectors);
689 static inline bool blk_queue_zone_is_seq(struct request_queue *q,
692 if (!blk_queue_is_zoned(q))
694 if (!q->conv_zones_bitmap)
696 return !test_bit(blk_queue_zone_no(q, sector), q->conv_zones_bitmap);
699 static inline void blk_queue_max_open_zones(struct request_queue *q,
700 unsigned int max_open_zones)
702 q->max_open_zones = max_open_zones;
705 static inline unsigned int queue_max_open_zones(const struct request_queue *q)
707 return q->max_open_zones;
710 static inline void blk_queue_max_active_zones(struct request_queue *q,
711 unsigned int max_active_zones)
713 q->max_active_zones = max_active_zones;
716 static inline unsigned int queue_max_active_zones(const struct request_queue *q)
718 return q->max_active_zones;
720 #else /* CONFIG_BLK_DEV_ZONED */
721 static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
725 static inline bool blk_queue_zone_is_seq(struct request_queue *q,
730 static inline unsigned int blk_queue_zone_no(struct request_queue *q,
735 static inline unsigned int queue_max_open_zones(const struct request_queue *q)
739 static inline unsigned int queue_max_active_zones(const struct request_queue *q)
743 #endif /* CONFIG_BLK_DEV_ZONED */
745 static inline unsigned int blk_queue_depth(struct request_queue *q)
748 return q->queue_depth;
750 return q->nr_requests;
754 * default timeout for SG_IO if none specified
756 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
757 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
759 /* This should not be used directly - use rq_for_each_segment */
760 #define for_each_bio(_bio) \
761 for (; _bio; _bio = _bio->bi_next)
763 int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
764 const struct attribute_group **groups);
765 static inline int __must_check add_disk(struct gendisk *disk)
767 return device_add_disk(NULL, disk, NULL);
769 void del_gendisk(struct gendisk *gp);
770 void invalidate_disk(struct gendisk *disk);
771 void set_disk_ro(struct gendisk *disk, bool read_only);
772 void disk_uevent(struct gendisk *disk, enum kobject_action action);
774 static inline int get_disk_ro(struct gendisk *disk)
776 return disk->part0->bd_read_only ||
777 test_bit(GD_READ_ONLY, &disk->state);
780 static inline int bdev_read_only(struct block_device *bdev)
782 return bdev->bd_read_only || get_disk_ro(bdev->bd_disk);
785 bool set_capacity_and_notify(struct gendisk *disk, sector_t size);
786 bool disk_force_media_change(struct gendisk *disk, unsigned int events);
788 void add_disk_randomness(struct gendisk *disk) __latent_entropy;
789 void rand_initialize_disk(struct gendisk *disk);
791 static inline sector_t get_start_sect(struct block_device *bdev)
793 return bdev->bd_start_sect;
796 static inline sector_t bdev_nr_sectors(struct block_device *bdev)
798 return bdev->bd_nr_sectors;
801 static inline loff_t bdev_nr_bytes(struct block_device *bdev)
803 return (loff_t)bdev_nr_sectors(bdev) << SECTOR_SHIFT;
806 static inline sector_t get_capacity(struct gendisk *disk)
808 return bdev_nr_sectors(disk->part0);
811 static inline u64 sb_bdev_nr_blocks(struct super_block *sb)
813 return bdev_nr_sectors(sb->s_bdev) >>
814 (sb->s_blocksize_bits - SECTOR_SHIFT);
817 int bdev_disk_changed(struct gendisk *disk, bool invalidate);
819 void put_disk(struct gendisk *disk);
820 struct gendisk *__blk_alloc_disk(int node, struct lock_class_key *lkclass);
823 * blk_alloc_disk - allocate a gendisk structure
824 * @node_id: numa node to allocate on
826 * Allocate and pre-initialize a gendisk structure for use with BIO based
831 #define blk_alloc_disk(node_id) \
833 static struct lock_class_key __key; \
835 __blk_alloc_disk(node_id, &__key); \
838 int __register_blkdev(unsigned int major, const char *name,
839 void (*probe)(dev_t devt));
840 #define register_blkdev(major, name) \
841 __register_blkdev(major, name, NULL)
842 void unregister_blkdev(unsigned int major, const char *name);
844 bool bdev_check_media_change(struct block_device *bdev);
845 int __invalidate_device(struct block_device *bdev, bool kill_dirty);
846 void set_capacity(struct gendisk *disk, sector_t size);
848 #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED
849 int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
850 void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk);
851 int bd_register_pending_holders(struct gendisk *disk);
853 static inline int bd_link_disk_holder(struct block_device *bdev,
854 struct gendisk *disk)
858 static inline void bd_unlink_disk_holder(struct block_device *bdev,
859 struct gendisk *disk)
862 static inline int bd_register_pending_holders(struct gendisk *disk)
866 #endif /* CONFIG_BLOCK_HOLDER_DEPRECATED */
868 dev_t part_devt(struct gendisk *disk, u8 partno);
869 void inc_diskseq(struct gendisk *disk);
870 dev_t blk_lookup_devt(const char *name, int partno);
871 void blk_request_module(dev_t devt);
873 extern int blk_register_queue(struct gendisk *disk);
874 extern void blk_unregister_queue(struct gendisk *disk);
875 void submit_bio_noacct(struct bio *bio);
877 extern int blk_lld_busy(struct request_queue *q);
878 extern void blk_queue_split(struct bio **);
879 extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags);
880 extern void blk_queue_exit(struct request_queue *q);
881 extern void blk_sync_queue(struct request_queue *q);
883 /* Helper to convert REQ_OP_XXX to its string format XXX */
884 extern const char *blk_op_str(unsigned int op);
886 int blk_status_to_errno(blk_status_t status);
887 blk_status_t errno_to_blk_status(int errno);
889 /* only poll the hardware once, don't continue until a completion was found */
890 #define BLK_POLL_ONESHOT (1 << 0)
891 /* do not sleep to wait for the expected completion time */
892 #define BLK_POLL_NOSLEEP (1 << 1)
893 int bio_poll(struct bio *bio, struct io_comp_batch *iob, unsigned int flags);
894 int iocb_bio_iopoll(struct kiocb *kiocb, struct io_comp_batch *iob,
897 static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
899 return bdev->bd_queue; /* this is never NULL */
902 /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */
903 const char *blk_zone_cond_str(enum blk_zone_cond zone_cond);
905 static inline unsigned int bio_zone_no(struct bio *bio)
907 return blk_queue_zone_no(bdev_get_queue(bio->bi_bdev),
908 bio->bi_iter.bi_sector);
911 static inline unsigned int bio_zone_is_seq(struct bio *bio)
913 return blk_queue_zone_is_seq(bdev_get_queue(bio->bi_bdev),
914 bio->bi_iter.bi_sector);
918 * Return how much of the chunk is left to be used for I/O at a given offset.
920 static inline unsigned int blk_chunk_sectors_left(sector_t offset,
921 unsigned int chunk_sectors)
923 if (unlikely(!is_power_of_2(chunk_sectors)))
924 return chunk_sectors - sector_div(offset, chunk_sectors);
925 return chunk_sectors - (offset & (chunk_sectors - 1));
929 * Access functions for manipulating queue properties
931 void blk_queue_bounce_limit(struct request_queue *q, enum blk_bounce limit);
932 extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
933 extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
934 extern void blk_queue_max_segments(struct request_queue *, unsigned short);
935 extern void blk_queue_max_discard_segments(struct request_queue *,
937 void blk_queue_max_secure_erase_sectors(struct request_queue *q,
938 unsigned int max_sectors);
939 extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
940 extern void blk_queue_max_discard_sectors(struct request_queue *q,
941 unsigned int max_discard_sectors);
942 extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
943 unsigned int max_write_same_sectors);
944 extern void blk_queue_logical_block_size(struct request_queue *, unsigned int);
945 extern void blk_queue_max_zone_append_sectors(struct request_queue *q,
946 unsigned int max_zone_append_sectors);
947 extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
948 void blk_queue_zone_write_granularity(struct request_queue *q,
950 extern void blk_queue_alignment_offset(struct request_queue *q,
951 unsigned int alignment);
952 void disk_update_readahead(struct gendisk *disk);
953 extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
954 extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
955 extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
956 extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
957 extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
958 extern void blk_set_default_limits(struct queue_limits *lim);
959 extern void blk_set_stacking_limits(struct queue_limits *lim);
960 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
962 extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
964 extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
965 extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
966 extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
967 extern void blk_queue_dma_alignment(struct request_queue *, int);
968 extern void blk_queue_update_dma_alignment(struct request_queue *, int);
969 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
970 extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
972 struct blk_independent_access_ranges *
973 disk_alloc_independent_access_ranges(struct gendisk *disk, int nr_ia_ranges);
974 void disk_set_independent_access_ranges(struct gendisk *disk,
975 struct blk_independent_access_ranges *iars);
978 * Elevator features for blk_queue_required_elevator_features:
980 /* Supports zoned block devices sequential write constraint */
981 #define ELEVATOR_F_ZBD_SEQ_WRITE (1U << 0)
983 extern void blk_queue_required_elevator_features(struct request_queue *q,
984 unsigned int features);
985 extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q,
988 bool __must_check blk_get_queue(struct request_queue *);
989 extern void blk_put_queue(struct request_queue *);
991 void blk_mark_disk_dead(struct gendisk *disk);
995 * blk_plug permits building a queue of related requests by holding the I/O
996 * fragments for a short period. This allows merging of sequential requests
997 * into single larger request. As the requests are moved from a per-task list to
998 * the device's request_queue in a batch, this results in improved scalability
999 * as the lock contention for request_queue lock is reduced.
1001 * It is ok not to disable preemption when adding the request to the plug list
1002 * or when attempting a merge. For details, please see schedule() where
1003 * blk_flush_plug() is called.
1006 struct request *mq_list; /* blk-mq requests */
1008 /* if ios_left is > 1, we can batch tag/rq allocations */
1009 struct request *cached_rq;
1010 unsigned short nr_ios;
1012 unsigned short rq_count;
1014 bool multiple_queues;
1018 struct list_head cb_list; /* md requires an unplug callback */
1022 typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
1023 struct blk_plug_cb {
1024 struct list_head list;
1025 blk_plug_cb_fn callback;
1028 extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
1029 void *data, int size);
1030 extern void blk_start_plug(struct blk_plug *);
1031 extern void blk_start_plug_nr_ios(struct blk_plug *, unsigned short);
1032 extern void blk_finish_plug(struct blk_plug *);
1034 void __blk_flush_plug(struct blk_plug *plug, bool from_schedule);
1035 static inline void blk_flush_plug(struct blk_plug *plug, bool async)
1038 __blk_flush_plug(plug, async);
1041 int blkdev_issue_flush(struct block_device *bdev);
1042 long nr_blockdev_pages(void);
1043 #else /* CONFIG_BLOCK */
1047 static inline void blk_start_plug_nr_ios(struct blk_plug *plug,
1048 unsigned short nr_ios)
1052 static inline void blk_start_plug(struct blk_plug *plug)
1056 static inline void blk_finish_plug(struct blk_plug *plug)
1060 static inline void blk_flush_plug(struct blk_plug *plug, bool async)
1064 static inline int blkdev_issue_flush(struct block_device *bdev)
1069 static inline long nr_blockdev_pages(void)
1073 #endif /* CONFIG_BLOCK */
1075 extern void blk_io_schedule(void);
1077 int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1078 sector_t nr_sects, gfp_t gfp_mask);
1079 int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1080 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop);
1081 int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector,
1082 sector_t nr_sects, gfp_t gfp);
1084 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
1085 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
1087 extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1088 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
1090 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1091 sector_t nr_sects, gfp_t gfp_mask, unsigned flags);
1093 static inline int sb_issue_discard(struct super_block *sb, sector_t block,
1094 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
1096 return blkdev_issue_discard(sb->s_bdev,
1097 block << (sb->s_blocksize_bits -
1099 nr_blocks << (sb->s_blocksize_bits -
1103 static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
1104 sector_t nr_blocks, gfp_t gfp_mask)
1106 return blkdev_issue_zeroout(sb->s_bdev,
1107 block << (sb->s_blocksize_bits -
1109 nr_blocks << (sb->s_blocksize_bits -
1114 static inline bool bdev_is_partition(struct block_device *bdev)
1116 return bdev->bd_partno;
1119 enum blk_default_limits {
1120 BLK_MAX_SEGMENTS = 128,
1121 BLK_SAFE_MAX_SECTORS = 255,
1122 BLK_DEF_MAX_SECTORS = 2560,
1123 BLK_MAX_SEGMENT_SIZE = 65536,
1124 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
1127 static inline unsigned long queue_segment_boundary(const struct request_queue *q)
1129 return q->limits.seg_boundary_mask;
1132 static inline unsigned long queue_virt_boundary(const struct request_queue *q)
1134 return q->limits.virt_boundary_mask;
1137 static inline unsigned int queue_max_sectors(const struct request_queue *q)
1139 return q->limits.max_sectors;
1142 static inline unsigned int queue_max_bytes(struct request_queue *q)
1144 return min_t(unsigned int, queue_max_sectors(q), INT_MAX >> 9) << 9;
1147 static inline unsigned int queue_max_hw_sectors(const struct request_queue *q)
1149 return q->limits.max_hw_sectors;
1152 static inline unsigned short queue_max_segments(const struct request_queue *q)
1154 return q->limits.max_segments;
1157 static inline unsigned short queue_max_discard_segments(const struct request_queue *q)
1159 return q->limits.max_discard_segments;
1162 static inline unsigned int queue_max_segment_size(const struct request_queue *q)
1164 return q->limits.max_segment_size;
1167 static inline unsigned int queue_max_zone_append_sectors(const struct request_queue *q)
1170 const struct queue_limits *l = &q->limits;
1172 return min(l->max_zone_append_sectors, l->max_sectors);
1175 static inline unsigned int
1176 bdev_max_zone_append_sectors(struct block_device *bdev)
1178 return queue_max_zone_append_sectors(bdev_get_queue(bdev));
1181 static inline unsigned queue_logical_block_size(const struct request_queue *q)
1185 if (q && q->limits.logical_block_size)
1186 retval = q->limits.logical_block_size;
1191 static inline unsigned int bdev_logical_block_size(struct block_device *bdev)
1193 return queue_logical_block_size(bdev_get_queue(bdev));
1196 static inline unsigned int queue_physical_block_size(const struct request_queue *q)
1198 return q->limits.physical_block_size;
1201 static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
1203 return queue_physical_block_size(bdev_get_queue(bdev));
1206 static inline unsigned int queue_io_min(const struct request_queue *q)
1208 return q->limits.io_min;
1211 static inline int bdev_io_min(struct block_device *bdev)
1213 return queue_io_min(bdev_get_queue(bdev));
1216 static inline unsigned int queue_io_opt(const struct request_queue *q)
1218 return q->limits.io_opt;
1221 static inline int bdev_io_opt(struct block_device *bdev)
1223 return queue_io_opt(bdev_get_queue(bdev));
1226 static inline unsigned int
1227 queue_zone_write_granularity(const struct request_queue *q)
1229 return q->limits.zone_write_granularity;
1232 static inline unsigned int
1233 bdev_zone_write_granularity(struct block_device *bdev)
1235 return queue_zone_write_granularity(bdev_get_queue(bdev));
1238 int bdev_alignment_offset(struct block_device *bdev);
1239 unsigned int bdev_discard_alignment(struct block_device *bdev);
1241 static inline unsigned int bdev_max_discard_sectors(struct block_device *bdev)
1243 return bdev_get_queue(bdev)->limits.max_discard_sectors;
1246 static inline unsigned int bdev_discard_granularity(struct block_device *bdev)
1248 return bdev_get_queue(bdev)->limits.discard_granularity;
1251 static inline unsigned int
1252 bdev_max_secure_erase_sectors(struct block_device *bdev)
1254 return bdev_get_queue(bdev)->limits.max_secure_erase_sectors;
1257 static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
1259 struct request_queue *q = bdev_get_queue(bdev);
1262 return q->limits.max_write_zeroes_sectors;
1267 static inline bool bdev_nonrot(struct block_device *bdev)
1269 return blk_queue_nonrot(bdev_get_queue(bdev));
1272 static inline bool bdev_stable_writes(struct block_device *bdev)
1274 return test_bit(QUEUE_FLAG_STABLE_WRITES,
1275 &bdev_get_queue(bdev)->queue_flags);
1278 static inline bool bdev_write_cache(struct block_device *bdev)
1280 return test_bit(QUEUE_FLAG_WC, &bdev_get_queue(bdev)->queue_flags);
1283 static inline bool bdev_fua(struct block_device *bdev)
1285 return test_bit(QUEUE_FLAG_FUA, &bdev_get_queue(bdev)->queue_flags);
1288 static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev)
1290 struct request_queue *q = bdev_get_queue(bdev);
1293 return blk_queue_zoned_model(q);
1295 return BLK_ZONED_NONE;
1298 static inline bool bdev_is_zoned(struct block_device *bdev)
1300 struct request_queue *q = bdev_get_queue(bdev);
1303 return blk_queue_is_zoned(q);
1308 static inline sector_t bdev_zone_sectors(struct block_device *bdev)
1310 struct request_queue *q = bdev_get_queue(bdev);
1313 return blk_queue_zone_sectors(q);
1317 static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
1319 struct request_queue *q = bdev_get_queue(bdev);
1322 return queue_max_open_zones(q);
1326 static inline unsigned int bdev_max_active_zones(struct block_device *bdev)
1328 struct request_queue *q = bdev_get_queue(bdev);
1331 return queue_max_active_zones(q);
1335 static inline int queue_dma_alignment(const struct request_queue *q)
1337 return q ? q->dma_alignment : 511;
1340 static inline unsigned int bdev_dma_alignment(struct block_device *bdev)
1342 return queue_dma_alignment(bdev_get_queue(bdev));
1345 static inline bool bdev_iter_is_aligned(struct block_device *bdev,
1346 struct iov_iter *iter)
1348 return iov_iter_is_aligned(iter, bdev_dma_alignment(bdev),
1349 bdev_logical_block_size(bdev) - 1);
1352 static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
1355 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
1356 return !(addr & alignment) && !(len & alignment);
1359 /* assumes size > 256 */
1360 static inline unsigned int blksize_bits(unsigned int size)
1362 unsigned int bits = 8;
1366 } while (size > 256);
1370 static inline unsigned int block_size(struct block_device *bdev)
1372 return 1 << bdev->bd_inode->i_blkbits;
1375 int kblockd_schedule_work(struct work_struct *work);
1376 int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
1378 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1379 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1380 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1381 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1383 #ifdef CONFIG_BLK_INLINE_ENCRYPTION
1385 bool blk_crypto_register(struct blk_crypto_profile *profile,
1386 struct request_queue *q);
1388 #else /* CONFIG_BLK_INLINE_ENCRYPTION */
1390 static inline bool blk_crypto_register(struct blk_crypto_profile *profile,
1391 struct request_queue *q)
1396 #endif /* CONFIG_BLK_INLINE_ENCRYPTION */
1398 enum blk_unique_id {
1399 /* these match the Designator Types specified in SPC */
1405 #define NFL4_UFLG_MASK 0x0000003F
1407 struct block_device_operations {
1408 void (*submit_bio)(struct bio *bio);
1409 int (*poll_bio)(struct bio *bio, struct io_comp_batch *iob,
1410 unsigned int flags);
1411 int (*open) (struct block_device *, fmode_t);
1412 void (*release) (struct gendisk *, fmode_t);
1413 int (*rw_page)(struct block_device *, sector_t, struct page *, unsigned int);
1414 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1415 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1416 unsigned int (*check_events) (struct gendisk *disk,
1417 unsigned int clearing);
1418 void (*unlock_native_capacity) (struct gendisk *);
1419 int (*getgeo)(struct block_device *, struct hd_geometry *);
1420 int (*set_read_only)(struct block_device *bdev, bool ro);
1421 void (*free_disk)(struct gendisk *disk);
1422 /* this callback is with swap_lock and sometimes page table lock held */
1423 void (*swap_slot_free_notify) (struct block_device *, unsigned long);
1424 int (*report_zones)(struct gendisk *, sector_t sector,
1425 unsigned int nr_zones, report_zones_cb cb, void *data);
1426 char *(*devnode)(struct gendisk *disk, umode_t *mode);
1427 /* returns the length of the identifier or a negative errno: */
1428 int (*get_unique_id)(struct gendisk *disk, u8 id[16],
1429 enum blk_unique_id id_type);
1430 struct module *owner;
1431 const struct pr_ops *pr_ops;
1434 * Special callback for probing GPT entry at a given sector.
1435 * Needed by Android devices, used by GPT scanner and MMC blk
1438 int (*alternative_gpt_sector)(struct gendisk *disk, sector_t *sector);
1441 #ifdef CONFIG_COMPAT
1442 extern int blkdev_compat_ptr_ioctl(struct block_device *, fmode_t,
1443 unsigned int, unsigned long);
1445 #define blkdev_compat_ptr_ioctl NULL
1448 extern int bdev_read_page(struct block_device *, sector_t, struct page *);
1449 extern int bdev_write_page(struct block_device *, sector_t, struct page *,
1450 struct writeback_control *);
1452 static inline void blk_wake_io_task(struct task_struct *waiter)
1455 * If we're polling, the task itself is doing the completions. For
1456 * that case, we don't need to signal a wakeup, it's enough to just
1457 * mark us as RUNNING.
1459 if (waiter == current)
1460 __set_current_state(TASK_RUNNING);
1462 wake_up_process(waiter);
1465 unsigned long bdev_start_io_acct(struct block_device *bdev,
1466 unsigned int sectors, unsigned int op,
1467 unsigned long start_time);
1468 void bdev_end_io_acct(struct block_device *bdev, unsigned int op,
1469 unsigned long start_time);
1471 void bio_start_io_acct_time(struct bio *bio, unsigned long start_time);
1472 unsigned long bio_start_io_acct(struct bio *bio);
1473 void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time,
1474 struct block_device *orig_bdev);
1477 * bio_end_io_acct - end I/O accounting for bio based drivers
1478 * @bio: bio to end account for
1479 * @start_time: start time returned by bio_start_io_acct()
1481 static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time)
1483 return bio_end_io_acct_remapped(bio, start_time, bio->bi_bdev);
1486 int bdev_read_only(struct block_device *bdev);
1487 int set_blocksize(struct block_device *bdev, int size);
1489 const char *bdevname(struct block_device *bdev, char *buffer);
1490 int lookup_bdev(const char *pathname, dev_t *dev);
1492 void blkdev_show(struct seq_file *seqf, off_t offset);
1494 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1495 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
1497 #define BLKDEV_MAJOR_MAX 512
1499 #define BLKDEV_MAJOR_MAX 0
1502 struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
1504 struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder);
1505 int bd_prepare_to_claim(struct block_device *bdev, void *holder);
1506 void bd_abort_claiming(struct block_device *bdev, void *holder);
1507 void blkdev_put(struct block_device *bdev, fmode_t mode);
1509 /* just for blk-cgroup, don't use elsewhere */
1510 struct block_device *blkdev_get_no_open(dev_t dev);
1511 void blkdev_put_no_open(struct block_device *bdev);
1513 struct block_device *bdev_alloc(struct gendisk *disk, u8 partno);
1514 void bdev_add(struct block_device *bdev, dev_t dev);
1515 struct block_device *I_BDEV(struct inode *inode);
1516 int truncate_bdev_range(struct block_device *bdev, fmode_t mode, loff_t lstart,
1520 void invalidate_bdev(struct block_device *bdev);
1521 int sync_blockdev(struct block_device *bdev);
1522 int sync_blockdev_range(struct block_device *bdev, loff_t lstart, loff_t lend);
1523 int sync_blockdev_nowait(struct block_device *bdev);
1524 void sync_bdevs(bool wait);
1525 void printk_all_partitions(void);
1527 static inline void invalidate_bdev(struct block_device *bdev)
1530 static inline int sync_blockdev(struct block_device *bdev)
1534 static inline int sync_blockdev_nowait(struct block_device *bdev)
1538 static inline void sync_bdevs(bool wait)
1541 static inline void printk_all_partitions(void)
1544 #endif /* CONFIG_BLOCK */
1546 int fsync_bdev(struct block_device *bdev);
1548 int freeze_bdev(struct block_device *bdev);
1549 int thaw_bdev(struct block_device *bdev);
1551 struct io_comp_batch {
1552 struct request *req_list;
1554 void (*complete)(struct io_comp_batch *);
1557 #define DEFINE_IO_COMP_BATCH(name) struct io_comp_batch name = { }
1559 #endif /* _LINUX_BLKDEV_H */