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>
27 #include <linux/file.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 const struct device_type part_type;
46 extern const struct class block_class;
49 * Maximum number of blkcg policies allowed to be registered concurrently.
50 * Defined here to simplify include dependency.
52 #define BLKCG_MAX_POLS 6
54 #define DISK_MAX_PARTS 256
55 #define DISK_NAME_LEN 32
57 #define PARTITION_META_INFO_VOLNAMELTH 64
59 * Enough for the string representation of any kind of UUID plus NULL.
60 * EFI UUID is 36 characters. MSDOS UUID is 11 characters.
62 #define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1)
64 struct partition_meta_info {
65 char uuid[PARTITION_META_INFO_UUIDLTH];
66 u8 volname[PARTITION_META_INFO_VOLNAMELTH];
70 * DOC: genhd capability flags
72 * ``GENHD_FL_REMOVABLE``: indicates that the block device gives access to
73 * removable media. When set, the device remains present even when media is not
74 * inserted. Shall not be set for devices which are removed entirely when the
77 * ``GENHD_FL_HIDDEN``: the block device is hidden; it doesn't produce events,
78 * doesn't appear in sysfs, and can't be opened from userspace or using
79 * blkdev_get*. Used for the underlying components of multipath devices.
81 * ``GENHD_FL_NO_PART``: partition support is disabled. The kernel will not
82 * scan for partitions from add_disk, and users can't add partitions manually.
86 GENHD_FL_REMOVABLE = 1 << 0,
87 GENHD_FL_HIDDEN = 1 << 1,
88 GENHD_FL_NO_PART = 1 << 2,
92 DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */
93 DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */
97 /* Poll even if events_poll_msecs is unset */
98 DISK_EVENT_FLAG_POLL = 1 << 0,
99 /* Forward events to udev */
100 DISK_EVENT_FLAG_UEVENT = 1 << 1,
101 /* Block event polling when open for exclusive write */
102 DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE = 1 << 2,
108 struct blk_integrity {
109 const struct blk_integrity_profile *profile;
111 unsigned char tuple_size;
112 unsigned char pi_offset;
113 unsigned char interval_exp;
114 unsigned char tag_size;
117 typedef unsigned int __bitwise blk_mode_t;
119 /* open for reading */
120 #define BLK_OPEN_READ ((__force blk_mode_t)(1 << 0))
121 /* open for writing */
122 #define BLK_OPEN_WRITE ((__force blk_mode_t)(1 << 1))
123 /* open exclusively (vs other exclusive openers */
124 #define BLK_OPEN_EXCL ((__force blk_mode_t)(1 << 2))
125 /* opened with O_NDELAY */
126 #define BLK_OPEN_NDELAY ((__force blk_mode_t)(1 << 3))
127 /* open for "writes" only for ioctls (specialy hack for floppy.c) */
128 #define BLK_OPEN_WRITE_IOCTL ((__force blk_mode_t)(1 << 4))
129 /* open is exclusive wrt all other BLK_OPEN_WRITE opens to the device */
130 #define BLK_OPEN_RESTRICT_WRITES ((__force blk_mode_t)(1 << 5))
131 /* return partition scanning errors */
132 #define BLK_OPEN_STRICT_SCAN ((__force blk_mode_t)(1 << 6))
136 * major/first_minor/minors should not be set by any new driver, the
137 * block core will take care of allocating them automatically.
143 char disk_name[DISK_NAME_LEN]; /* name of major driver */
145 unsigned short events; /* supported events */
146 unsigned short event_flags; /* flags related to event processing */
148 struct xarray part_tbl;
149 struct block_device *part0;
151 const struct block_device_operations *fops;
152 struct request_queue *queue;
155 struct bio_set bio_split;
159 #define GD_NEED_PART_SCAN 0
160 #define GD_READ_ONLY 1
162 #define GD_NATIVE_CAPACITY 3
164 #define GD_SUPPRESS_PART_SCAN 5
165 #define GD_OWNS_QUEUE 6
167 struct mutex open_mutex; /* open/close mutex */
168 unsigned open_partitions; /* number of open partitions */
170 struct backing_dev_info *bdi;
171 struct kobject queue_kobj; /* the queue/ directory */
172 struct kobject *slave_dir;
173 #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED
174 struct list_head slave_bdevs;
176 struct timer_rand_state *random;
177 atomic_t sync_io; /* RAID */
178 struct disk_events *ev;
180 #ifdef CONFIG_BLK_DEV_ZONED
182 * Zoned block device information for request dispatch control.
183 * nr_zones is the total number of zones of the device. This is always
184 * 0 for regular block devices. conv_zones_bitmap is a bitmap of nr_zones
185 * bits which indicates if a zone is conventional (bit set) or
186 * sequential (bit clear). seq_zones_wlock is a bitmap of nr_zones
187 * bits which indicates if a zone is write locked, that is, if a write
188 * request targeting the zone was dispatched.
190 * Reads of this information must be protected with blk_queue_enter() /
191 * blk_queue_exit(). Modifying this information is only allowed while
192 * no requests are being processed. See also blk_mq_freeze_queue() and
193 * blk_mq_unfreeze_queue().
195 unsigned int nr_zones;
196 unsigned long *conv_zones_bitmap;
197 unsigned long *seq_zones_wlock;
198 #endif /* CONFIG_BLK_DEV_ZONED */
200 #if IS_ENABLED(CONFIG_CDROM)
201 struct cdrom_device_info *cdi;
204 struct badblocks *bb;
205 struct lockdep_map lockdep_map;
207 blk_mode_t open_mode;
210 * Independent sector access ranges. This is always NULL for
211 * devices that do not have multiple independent access ranges.
213 struct blk_independent_access_ranges *ia_ranges;
216 static inline bool disk_live(struct gendisk *disk)
218 return !inode_unhashed(disk->part0->bd_inode);
222 * disk_openers - returns how many openers are there for a disk
223 * @disk: disk to check
225 * This returns the number of openers for a disk. Note that this value is only
226 * stable if disk->open_mutex is held.
228 * Note: Due to a quirk in the block layer open code, each open partition is
229 * only counted once even if there are multiple openers.
231 static inline unsigned int disk_openers(struct gendisk *disk)
233 return atomic_read(&disk->part0->bd_openers);
237 * disk_has_partscan - return %true if partition scanning is enabled on a disk
238 * @disk: disk to check
240 * Returns %true if partitions scanning is enabled for @disk, or %false if
241 * partition scanning is disabled either permanently or temporarily.
243 static inline bool disk_has_partscan(struct gendisk *disk)
245 return !(disk->flags & (GENHD_FL_NO_PART | GENHD_FL_HIDDEN)) &&
246 !test_bit(GD_SUPPRESS_PART_SCAN, &disk->state);
250 * The gendisk is refcounted by the part0 block_device, and the bd_device
251 * therein is also used for device model presentation in sysfs.
253 #define dev_to_disk(device) \
254 (dev_to_bdev(device)->bd_disk)
255 #define disk_to_dev(disk) \
256 (&((disk)->part0->bd_device))
258 #if IS_REACHABLE(CONFIG_CDROM)
259 #define disk_to_cdi(disk) ((disk)->cdi)
261 #define disk_to_cdi(disk) NULL
264 static inline dev_t disk_devt(struct gendisk *disk)
266 return MKDEV(disk->major, disk->first_minor);
269 static inline int blk_validate_block_size(unsigned long bsize)
271 if (bsize < 512 || bsize > PAGE_SIZE || !is_power_of_2(bsize))
277 static inline bool blk_op_is_passthrough(blk_opf_t op)
280 return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT;
284 * BLK_BOUNCE_NONE: never bounce (default)
285 * BLK_BOUNCE_HIGH: bounce all highmem pages
292 struct queue_limits {
293 enum blk_bounce bounce;
294 unsigned long seg_boundary_mask;
295 unsigned long virt_boundary_mask;
297 unsigned int max_hw_sectors;
298 unsigned int max_dev_sectors;
299 unsigned int chunk_sectors;
300 unsigned int max_sectors;
301 unsigned int max_user_sectors;
302 unsigned int max_segment_size;
303 unsigned int physical_block_size;
304 unsigned int logical_block_size;
305 unsigned int alignment_offset;
308 unsigned int max_discard_sectors;
309 unsigned int max_hw_discard_sectors;
310 unsigned int max_user_discard_sectors;
311 unsigned int max_secure_erase_sectors;
312 unsigned int max_write_zeroes_sectors;
313 unsigned int max_zone_append_sectors;
314 unsigned int discard_granularity;
315 unsigned int discard_alignment;
316 unsigned int zone_write_granularity;
318 unsigned short max_segments;
319 unsigned short max_integrity_segments;
320 unsigned short max_discard_segments;
322 unsigned char misaligned;
323 unsigned char discard_misaligned;
324 unsigned char raid_partial_stripes_expensive;
326 unsigned int max_open_zones;
327 unsigned int max_active_zones;
330 * Drivers that set dma_alignment to less than 511 must be prepared to
331 * handle individual bvec's that are not a multiple of a SECTOR_SIZE
332 * due to possible offsets.
334 unsigned int dma_alignment;
337 typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx,
340 void disk_set_zoned(struct gendisk *disk);
342 #define BLK_ALL_ZONES ((unsigned int)-1)
343 int blkdev_report_zones(struct block_device *bdev, sector_t sector,
344 unsigned int nr_zones, report_zones_cb cb, void *data);
345 int blkdev_zone_mgmt(struct block_device *bdev, enum req_op op,
346 sector_t sectors, sector_t nr_sectors);
347 int blk_revalidate_disk_zones(struct gendisk *disk,
348 void (*update_driver_data)(struct gendisk *disk));
351 * Independent access ranges: struct blk_independent_access_range describes
352 * a range of contiguous sectors that can be accessed using device command
353 * execution resources that are independent from the resources used for
354 * other access ranges. This is typically found with single-LUN multi-actuator
355 * HDDs where each access range is served by a different set of heads.
356 * The set of independent ranges supported by the device is defined using
357 * struct blk_independent_access_ranges. The independent ranges must not overlap
358 * and must include all sectors within the disk capacity (no sector holes
360 * For a device with multiple ranges, requests targeting sectors in different
361 * ranges can be executed in parallel. A request can straddle an access range
364 struct blk_independent_access_range {
370 struct blk_independent_access_ranges {
372 bool sysfs_registered;
373 unsigned int nr_ia_ranges;
374 struct blk_independent_access_range ia_range[];
377 struct request_queue {
379 * The queue owner gets to use this for whatever they like.
380 * ll_rw_blk doesn't touch it.
384 struct elevator_queue *elevator;
386 const struct blk_mq_ops *mq_ops;
389 struct blk_mq_ctx __percpu *queue_ctx;
392 * various queue flags, see QUEUE_* below
394 unsigned long queue_flags;
396 unsigned int rq_timeout;
398 unsigned int queue_depth;
402 /* hw dispatch queues */
403 unsigned int nr_hw_queues;
404 struct xarray hctx_table;
406 struct percpu_ref q_usage_counter;
408 struct request *last_merge;
410 spinlock_t queue_lock;
414 struct gendisk *disk;
419 struct kobject *mq_kobj;
421 struct queue_limits limits;
423 #ifdef CONFIG_BLK_DEV_INTEGRITY
424 struct blk_integrity integrity;
425 #endif /* CONFIG_BLK_DEV_INTEGRITY */
429 enum rpm_status rpm_status;
433 * Number of contexts that have called blk_set_pm_only(). If this
434 * counter is above zero then only RQF_PM requests are processed.
438 struct blk_queue_stats *stats;
439 struct rq_qos *rq_qos;
440 struct mutex rq_qos_mutex;
443 * ida allocated id for this queue. Used to index queues from
448 unsigned int dma_pad_mask;
453 unsigned long nr_requests; /* Max # of requests */
455 #ifdef CONFIG_BLK_INLINE_ENCRYPTION
456 struct blk_crypto_profile *crypto_profile;
457 struct kobject *crypto_kobject;
460 struct timer_list timeout;
461 struct work_struct timeout_work;
463 atomic_t nr_active_requests_shared_tags;
465 unsigned int required_elevator_features;
467 struct blk_mq_tags *sched_shared_tags;
469 struct list_head icq_list;
470 #ifdef CONFIG_BLK_CGROUP
471 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
472 struct blkcg_gq *root_blkg;
473 struct list_head blkg_list;
474 struct mutex blkcg_mutex;
479 spinlock_t requeue_lock;
480 struct list_head requeue_list;
481 struct delayed_work requeue_work;
483 #ifdef CONFIG_BLK_DEV_IO_TRACE
484 struct blk_trace __rcu *blk_trace;
487 * for flush operations
489 struct blk_flush_queue *fq;
490 struct list_head flush_list;
492 struct mutex sysfs_lock;
493 struct mutex sysfs_dir_lock;
494 struct mutex limits_lock;
497 * for reusing dead hctx instance in case of updating
500 struct list_head unused_hctx_list;
501 spinlock_t unused_hctx_lock;
505 #ifdef CONFIG_BLK_DEV_THROTTLING
507 struct throtl_data *td;
509 struct rcu_head rcu_head;
510 wait_queue_head_t mq_freeze_wq;
512 * Protect concurrent access to q_usage_counter by
513 * percpu_ref_kill() and percpu_ref_reinit().
515 struct mutex mq_freeze_lock;
517 struct blk_mq_tag_set *tag_set;
518 struct list_head tag_set_list;
520 struct dentry *debugfs_dir;
521 struct dentry *sched_debugfs_dir;
522 struct dentry *rqos_debugfs_dir;
524 * Serializes all debugfs metadata operations using the above dentries.
526 struct mutex debugfs_mutex;
528 bool mq_sysfs_init_done;
531 /* Keep blk_queue_flag_name[] in sync with the definitions below */
532 #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */
533 #define QUEUE_FLAG_DYING 1 /* queue being torn down */
534 #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */
535 #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */
536 #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */
537 #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */
538 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
539 #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */
540 #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */
541 #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */
542 #define QUEUE_FLAG_SYNCHRONOUS 11 /* always completes in submit context */
543 #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */
544 #define QUEUE_FLAG_HW_WC 13 /* Write back caching supported */
545 #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */
546 #define QUEUE_FLAG_STABLE_WRITES 15 /* don't modify blks until WB is done */
547 #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */
548 #define QUEUE_FLAG_WC 17 /* Write back caching */
549 #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */
550 #define QUEUE_FLAG_DAX 19 /* device supports DAX */
551 #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */
552 #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */
553 #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */
554 #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */
555 #define QUEUE_FLAG_ZONE_RESETALL 26 /* supports Zone Reset All */
556 #define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */
557 #define QUEUE_FLAG_HCTX_ACTIVE 28 /* at least one blk-mq hctx is active */
558 #define QUEUE_FLAG_NOWAIT 29 /* device supports NOWAIT */
559 #define QUEUE_FLAG_SQ_SCHED 30 /* single queue style io dispatch */
560 #define QUEUE_FLAG_SKIP_TAGSET_QUIESCE 31 /* quiesce_tagset skip the queue*/
562 #define QUEUE_FLAG_MQ_DEFAULT ((1UL << QUEUE_FLAG_IO_STAT) | \
563 (1UL << QUEUE_FLAG_SAME_COMP) | \
564 (1UL << QUEUE_FLAG_NOWAIT))
566 void blk_queue_flag_set(unsigned int flag, struct request_queue *q);
567 void blk_queue_flag_clear(unsigned int flag, struct request_queue *q);
568 bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
570 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
571 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
572 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
573 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
574 #define blk_queue_noxmerges(q) \
575 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
576 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
577 #define blk_queue_stable_writes(q) \
578 test_bit(QUEUE_FLAG_STABLE_WRITES, &(q)->queue_flags)
579 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
580 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
581 #define blk_queue_zone_resetall(q) \
582 test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags)
583 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
584 #define blk_queue_pci_p2pdma(q) \
585 test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags)
586 #ifdef CONFIG_BLK_RQ_ALLOC_TIME
587 #define blk_queue_rq_alloc_time(q) \
588 test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags)
590 #define blk_queue_rq_alloc_time(q) false
593 #define blk_noretry_request(rq) \
594 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
595 REQ_FAILFAST_DRIVER))
596 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
597 #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only)
598 #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags)
599 #define blk_queue_sq_sched(q) test_bit(QUEUE_FLAG_SQ_SCHED, &(q)->queue_flags)
600 #define blk_queue_skip_tagset_quiesce(q) \
601 test_bit(QUEUE_FLAG_SKIP_TAGSET_QUIESCE, &(q)->queue_flags)
603 extern void blk_set_pm_only(struct request_queue *q);
604 extern void blk_clear_pm_only(struct request_queue *q);
606 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
608 #define dma_map_bvec(dev, bv, dir, attrs) \
609 dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \
612 static inline bool queue_is_mq(struct request_queue *q)
618 static inline enum rpm_status queue_rpm_status(struct request_queue *q)
620 return q->rpm_status;
623 static inline enum rpm_status queue_rpm_status(struct request_queue *q)
629 static inline bool blk_queue_is_zoned(struct request_queue *q)
631 return IS_ENABLED(CONFIG_BLK_DEV_ZONED) && q->limits.zoned;
634 #ifdef CONFIG_BLK_DEV_ZONED
635 unsigned int bdev_nr_zones(struct block_device *bdev);
637 static inline unsigned int disk_nr_zones(struct gendisk *disk)
639 return blk_queue_is_zoned(disk->queue) ? disk->nr_zones : 0;
642 static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector)
644 if (!blk_queue_is_zoned(disk->queue))
646 return sector >> ilog2(disk->queue->limits.chunk_sectors);
649 static inline bool disk_zone_is_seq(struct gendisk *disk, sector_t sector)
651 if (!blk_queue_is_zoned(disk->queue))
653 if (!disk->conv_zones_bitmap)
655 return !test_bit(disk_zone_no(disk, sector), disk->conv_zones_bitmap);
658 static inline void disk_set_max_open_zones(struct gendisk *disk,
659 unsigned int max_open_zones)
661 disk->queue->limits.max_open_zones = max_open_zones;
664 static inline void disk_set_max_active_zones(struct gendisk *disk,
665 unsigned int max_active_zones)
667 disk->queue->limits.max_active_zones = max_active_zones;
670 static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
672 return bdev->bd_disk->queue->limits.max_open_zones;
675 static inline unsigned int bdev_max_active_zones(struct block_device *bdev)
677 return bdev->bd_disk->queue->limits.max_active_zones;
680 #else /* CONFIG_BLK_DEV_ZONED */
681 static inline unsigned int bdev_nr_zones(struct block_device *bdev)
686 static inline unsigned int disk_nr_zones(struct gendisk *disk)
690 static inline bool disk_zone_is_seq(struct gendisk *disk, sector_t sector)
694 static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector)
698 static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
703 static inline unsigned int bdev_max_active_zones(struct block_device *bdev)
707 #endif /* CONFIG_BLK_DEV_ZONED */
709 static inline unsigned int blk_queue_depth(struct request_queue *q)
712 return q->queue_depth;
714 return q->nr_requests;
718 * default timeout for SG_IO if none specified
720 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
721 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
723 /* This should not be used directly - use rq_for_each_segment */
724 #define for_each_bio(_bio) \
725 for (; _bio; _bio = _bio->bi_next)
727 int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
728 const struct attribute_group **groups);
729 static inline int __must_check add_disk(struct gendisk *disk)
731 return device_add_disk(NULL, disk, NULL);
733 void del_gendisk(struct gendisk *gp);
734 void invalidate_disk(struct gendisk *disk);
735 void set_disk_ro(struct gendisk *disk, bool read_only);
736 void disk_uevent(struct gendisk *disk, enum kobject_action action);
738 static inline int get_disk_ro(struct gendisk *disk)
740 return disk->part0->bd_read_only ||
741 test_bit(GD_READ_ONLY, &disk->state);
744 static inline int bdev_read_only(struct block_device *bdev)
746 return bdev->bd_read_only || get_disk_ro(bdev->bd_disk);
749 bool set_capacity_and_notify(struct gendisk *disk, sector_t size);
750 void disk_force_media_change(struct gendisk *disk);
751 void bdev_mark_dead(struct block_device *bdev, bool surprise);
753 void add_disk_randomness(struct gendisk *disk) __latent_entropy;
754 void rand_initialize_disk(struct gendisk *disk);
756 static inline sector_t get_start_sect(struct block_device *bdev)
758 return bdev->bd_start_sect;
761 static inline sector_t bdev_nr_sectors(struct block_device *bdev)
763 return bdev->bd_nr_sectors;
766 static inline loff_t bdev_nr_bytes(struct block_device *bdev)
768 return (loff_t)bdev_nr_sectors(bdev) << SECTOR_SHIFT;
771 static inline sector_t get_capacity(struct gendisk *disk)
773 return bdev_nr_sectors(disk->part0);
776 static inline u64 sb_bdev_nr_blocks(struct super_block *sb)
778 return bdev_nr_sectors(sb->s_bdev) >>
779 (sb->s_blocksize_bits - SECTOR_SHIFT);
782 int bdev_disk_changed(struct gendisk *disk, bool invalidate);
784 void put_disk(struct gendisk *disk);
785 struct gendisk *__blk_alloc_disk(struct queue_limits *lim, int node,
786 struct lock_class_key *lkclass);
789 * blk_alloc_disk - allocate a gendisk structure
790 * @lim: queue limits to be used for this disk.
791 * @node_id: numa node to allocate on
793 * Allocate and pre-initialize a gendisk structure for use with BIO based
796 * Returns an ERR_PTR on error, else the allocated disk.
800 #define blk_alloc_disk(lim, node_id) \
802 static struct lock_class_key __key; \
804 __blk_alloc_disk(lim, node_id, &__key); \
807 int __register_blkdev(unsigned int major, const char *name,
808 void (*probe)(dev_t devt));
809 #define register_blkdev(major, name) \
810 __register_blkdev(major, name, NULL)
811 void unregister_blkdev(unsigned int major, const char *name);
813 bool disk_check_media_change(struct gendisk *disk);
814 void set_capacity(struct gendisk *disk, sector_t size);
816 #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED
817 int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
818 void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk);
820 static inline int bd_link_disk_holder(struct block_device *bdev,
821 struct gendisk *disk)
825 static inline void bd_unlink_disk_holder(struct block_device *bdev,
826 struct gendisk *disk)
829 #endif /* CONFIG_BLOCK_HOLDER_DEPRECATED */
831 dev_t part_devt(struct gendisk *disk, u8 partno);
832 void inc_diskseq(struct gendisk *disk);
833 void blk_request_module(dev_t devt);
835 extern int blk_register_queue(struct gendisk *disk);
836 extern void blk_unregister_queue(struct gendisk *disk);
837 void submit_bio_noacct(struct bio *bio);
838 struct bio *bio_split_to_limits(struct bio *bio);
840 extern int blk_lld_busy(struct request_queue *q);
841 extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags);
842 extern void blk_queue_exit(struct request_queue *q);
843 extern void blk_sync_queue(struct request_queue *q);
845 /* Helper to convert REQ_OP_XXX to its string format XXX */
846 extern const char *blk_op_str(enum req_op op);
848 int blk_status_to_errno(blk_status_t status);
849 blk_status_t errno_to_blk_status(int errno);
850 const char *blk_status_to_str(blk_status_t status);
852 /* only poll the hardware once, don't continue until a completion was found */
853 #define BLK_POLL_ONESHOT (1 << 0)
854 int bio_poll(struct bio *bio, struct io_comp_batch *iob, unsigned int flags);
855 int iocb_bio_iopoll(struct kiocb *kiocb, struct io_comp_batch *iob,
858 static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
860 return bdev->bd_queue; /* this is never NULL */
863 /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */
864 const char *blk_zone_cond_str(enum blk_zone_cond zone_cond);
866 static inline unsigned int bio_zone_no(struct bio *bio)
868 return disk_zone_no(bio->bi_bdev->bd_disk, bio->bi_iter.bi_sector);
871 static inline unsigned int bio_zone_is_seq(struct bio *bio)
873 return disk_zone_is_seq(bio->bi_bdev->bd_disk, bio->bi_iter.bi_sector);
877 * Return how much of the chunk is left to be used for I/O at a given offset.
879 static inline unsigned int blk_chunk_sectors_left(sector_t offset,
880 unsigned int chunk_sectors)
882 if (unlikely(!is_power_of_2(chunk_sectors)))
883 return chunk_sectors - sector_div(offset, chunk_sectors);
884 return chunk_sectors - (offset & (chunk_sectors - 1));
888 * queue_limits_start_update - start an atomic update of queue limits
889 * @q: queue to update
891 * This functions starts an atomic update of the queue limits. It takes a lock
892 * to prevent other updates and returns a snapshot of the current limits that
893 * the caller can modify. The caller must call queue_limits_commit_update()
894 * to finish the update.
896 * Context: process context. The caller must have frozen the queue or ensured
897 * that there is outstanding I/O by other means.
899 static inline struct queue_limits
900 queue_limits_start_update(struct request_queue *q)
901 __acquires(q->limits_lock)
903 mutex_lock(&q->limits_lock);
906 int queue_limits_commit_update(struct request_queue *q,
907 struct queue_limits *lim);
908 int queue_limits_set(struct request_queue *q, struct queue_limits *lim);
911 * Access functions for manipulating queue properties
913 void blk_queue_bounce_limit(struct request_queue *q, enum blk_bounce limit);
914 extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
915 extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
916 extern void blk_queue_max_segments(struct request_queue *, unsigned short);
917 extern void blk_queue_max_discard_segments(struct request_queue *,
919 void blk_queue_max_secure_erase_sectors(struct request_queue *q,
920 unsigned int max_sectors);
921 extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
922 extern void blk_queue_max_discard_sectors(struct request_queue *q,
923 unsigned int max_discard_sectors);
924 extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
925 unsigned int max_write_same_sectors);
926 extern void blk_queue_logical_block_size(struct request_queue *, unsigned int);
927 extern void blk_queue_max_zone_append_sectors(struct request_queue *q,
928 unsigned int max_zone_append_sectors);
929 extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
930 void blk_queue_zone_write_granularity(struct request_queue *q,
932 extern void blk_queue_alignment_offset(struct request_queue *q,
933 unsigned int alignment);
934 void disk_update_readahead(struct gendisk *disk);
935 extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
936 extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
937 extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
938 extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
939 extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
940 extern void blk_set_stacking_limits(struct queue_limits *lim);
941 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
943 void queue_limits_stack_bdev(struct queue_limits *t, struct block_device *bdev,
944 sector_t offset, const char *pfx);
945 extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
946 extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
947 extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
948 extern void blk_queue_dma_alignment(struct request_queue *, int);
949 extern void blk_queue_update_dma_alignment(struct request_queue *, int);
950 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
951 extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
953 struct blk_independent_access_ranges *
954 disk_alloc_independent_access_ranges(struct gendisk *disk, int nr_ia_ranges);
955 void disk_set_independent_access_ranges(struct gendisk *disk,
956 struct blk_independent_access_ranges *iars);
959 * Elevator features for blk_queue_required_elevator_features:
961 /* Supports zoned block devices sequential write constraint */
962 #define ELEVATOR_F_ZBD_SEQ_WRITE (1U << 0)
964 extern void blk_queue_required_elevator_features(struct request_queue *q,
965 unsigned int features);
966 extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q,
969 bool __must_check blk_get_queue(struct request_queue *);
970 extern void blk_put_queue(struct request_queue *);
972 void blk_mark_disk_dead(struct gendisk *disk);
976 * blk_plug permits building a queue of related requests by holding the I/O
977 * fragments for a short period. This allows merging of sequential requests
978 * into single larger request. As the requests are moved from a per-task list to
979 * the device's request_queue in a batch, this results in improved scalability
980 * as the lock contention for request_queue lock is reduced.
982 * It is ok not to disable preemption when adding the request to the plug list
983 * or when attempting a merge. For details, please see schedule() where
984 * blk_flush_plug() is called.
987 struct request *mq_list; /* blk-mq requests */
989 /* if ios_left is > 1, we can batch tag/rq allocations */
990 struct request *cached_rq;
992 unsigned short nr_ios;
994 unsigned short rq_count;
996 bool multiple_queues;
999 struct list_head cb_list; /* md requires an unplug callback */
1003 typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
1004 struct blk_plug_cb {
1005 struct list_head list;
1006 blk_plug_cb_fn callback;
1009 extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
1010 void *data, int size);
1011 extern void blk_start_plug(struct blk_plug *);
1012 extern void blk_start_plug_nr_ios(struct blk_plug *, unsigned short);
1013 extern void blk_finish_plug(struct blk_plug *);
1015 void __blk_flush_plug(struct blk_plug *plug, bool from_schedule);
1016 static inline void blk_flush_plug(struct blk_plug *plug, bool async)
1019 __blk_flush_plug(plug, async);
1023 * tsk == current here
1025 static inline void blk_plug_invalidate_ts(struct task_struct *tsk)
1027 struct blk_plug *plug = tsk->plug;
1030 plug->cur_ktime = 0;
1031 current->flags &= ~PF_BLOCK_TS;
1034 int blkdev_issue_flush(struct block_device *bdev);
1035 long nr_blockdev_pages(void);
1036 #else /* CONFIG_BLOCK */
1040 static inline void blk_start_plug_nr_ios(struct blk_plug *plug,
1041 unsigned short nr_ios)
1045 static inline void blk_start_plug(struct blk_plug *plug)
1049 static inline void blk_finish_plug(struct blk_plug *plug)
1053 static inline void blk_flush_plug(struct blk_plug *plug, bool async)
1057 static inline void blk_plug_invalidate_ts(struct task_struct *tsk)
1061 static inline int blkdev_issue_flush(struct block_device *bdev)
1066 static inline long nr_blockdev_pages(void)
1070 #endif /* CONFIG_BLOCK */
1072 extern void blk_io_schedule(void);
1074 int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1075 sector_t nr_sects, gfp_t gfp_mask);
1076 int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1077 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop);
1078 int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector,
1079 sector_t nr_sects, gfp_t gfp);
1081 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
1082 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
1084 extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1085 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
1087 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1088 sector_t nr_sects, gfp_t gfp_mask, unsigned flags);
1090 static inline int sb_issue_discard(struct super_block *sb, sector_t block,
1091 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
1093 return blkdev_issue_discard(sb->s_bdev,
1094 block << (sb->s_blocksize_bits -
1096 nr_blocks << (sb->s_blocksize_bits -
1100 static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
1101 sector_t nr_blocks, gfp_t gfp_mask)
1103 return blkdev_issue_zeroout(sb->s_bdev,
1104 block << (sb->s_blocksize_bits -
1106 nr_blocks << (sb->s_blocksize_bits -
1111 static inline bool bdev_is_partition(struct block_device *bdev)
1113 return bdev->bd_partno;
1116 enum blk_default_limits {
1117 BLK_MAX_SEGMENTS = 128,
1118 BLK_SAFE_MAX_SECTORS = 255,
1119 BLK_MAX_SEGMENT_SIZE = 65536,
1120 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
1124 * Default upper limit for the software max_sectors limit used for
1125 * regular file system I/O. This can be increased through sysfs.
1127 * Not to be confused with the max_hw_sector limit that is entirely
1128 * controlled by the driver, usually based on hardware limits.
1130 #define BLK_DEF_MAX_SECTORS_CAP 2560u
1132 static inline unsigned long queue_segment_boundary(const struct request_queue *q)
1134 return q->limits.seg_boundary_mask;
1137 static inline unsigned long queue_virt_boundary(const struct request_queue *q)
1139 return q->limits.virt_boundary_mask;
1142 static inline unsigned int queue_max_sectors(const struct request_queue *q)
1144 return q->limits.max_sectors;
1147 static inline unsigned int queue_max_bytes(struct request_queue *q)
1149 return min_t(unsigned int, queue_max_sectors(q), INT_MAX >> 9) << 9;
1152 static inline unsigned int queue_max_hw_sectors(const struct request_queue *q)
1154 return q->limits.max_hw_sectors;
1157 static inline unsigned short queue_max_segments(const struct request_queue *q)
1159 return q->limits.max_segments;
1162 static inline unsigned short queue_max_discard_segments(const struct request_queue *q)
1164 return q->limits.max_discard_segments;
1167 static inline unsigned int queue_max_segment_size(const struct request_queue *q)
1169 return q->limits.max_segment_size;
1172 static inline unsigned int queue_max_zone_append_sectors(const struct request_queue *q)
1175 const struct queue_limits *l = &q->limits;
1177 return min(l->max_zone_append_sectors, l->max_sectors);
1180 static inline unsigned int
1181 bdev_max_zone_append_sectors(struct block_device *bdev)
1183 return queue_max_zone_append_sectors(bdev_get_queue(bdev));
1186 static inline unsigned int bdev_max_segments(struct block_device *bdev)
1188 return queue_max_segments(bdev_get_queue(bdev));
1191 static inline unsigned queue_logical_block_size(const struct request_queue *q)
1195 if (q && q->limits.logical_block_size)
1196 retval = q->limits.logical_block_size;
1201 static inline unsigned int bdev_logical_block_size(struct block_device *bdev)
1203 return queue_logical_block_size(bdev_get_queue(bdev));
1206 static inline unsigned int queue_physical_block_size(const struct request_queue *q)
1208 return q->limits.physical_block_size;
1211 static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
1213 return queue_physical_block_size(bdev_get_queue(bdev));
1216 static inline unsigned int queue_io_min(const struct request_queue *q)
1218 return q->limits.io_min;
1221 static inline int bdev_io_min(struct block_device *bdev)
1223 return queue_io_min(bdev_get_queue(bdev));
1226 static inline unsigned int queue_io_opt(const struct request_queue *q)
1228 return q->limits.io_opt;
1231 static inline int bdev_io_opt(struct block_device *bdev)
1233 return queue_io_opt(bdev_get_queue(bdev));
1236 static inline unsigned int
1237 queue_zone_write_granularity(const struct request_queue *q)
1239 return q->limits.zone_write_granularity;
1242 static inline unsigned int
1243 bdev_zone_write_granularity(struct block_device *bdev)
1245 return queue_zone_write_granularity(bdev_get_queue(bdev));
1248 int bdev_alignment_offset(struct block_device *bdev);
1249 unsigned int bdev_discard_alignment(struct block_device *bdev);
1251 static inline unsigned int bdev_max_discard_sectors(struct block_device *bdev)
1253 return bdev_get_queue(bdev)->limits.max_discard_sectors;
1256 static inline unsigned int bdev_discard_granularity(struct block_device *bdev)
1258 return bdev_get_queue(bdev)->limits.discard_granularity;
1261 static inline unsigned int
1262 bdev_max_secure_erase_sectors(struct block_device *bdev)
1264 return bdev_get_queue(bdev)->limits.max_secure_erase_sectors;
1267 static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
1269 struct request_queue *q = bdev_get_queue(bdev);
1272 return q->limits.max_write_zeroes_sectors;
1277 static inline bool bdev_nonrot(struct block_device *bdev)
1279 return blk_queue_nonrot(bdev_get_queue(bdev));
1282 static inline bool bdev_synchronous(struct block_device *bdev)
1284 return test_bit(QUEUE_FLAG_SYNCHRONOUS,
1285 &bdev_get_queue(bdev)->queue_flags);
1288 static inline bool bdev_stable_writes(struct block_device *bdev)
1290 return test_bit(QUEUE_FLAG_STABLE_WRITES,
1291 &bdev_get_queue(bdev)->queue_flags);
1294 static inline bool bdev_write_cache(struct block_device *bdev)
1296 return test_bit(QUEUE_FLAG_WC, &bdev_get_queue(bdev)->queue_flags);
1299 static inline bool bdev_fua(struct block_device *bdev)
1301 return test_bit(QUEUE_FLAG_FUA, &bdev_get_queue(bdev)->queue_flags);
1304 static inline bool bdev_nowait(struct block_device *bdev)
1306 return test_bit(QUEUE_FLAG_NOWAIT, &bdev_get_queue(bdev)->queue_flags);
1309 static inline bool bdev_is_zoned(struct block_device *bdev)
1311 return blk_queue_is_zoned(bdev_get_queue(bdev));
1314 static inline unsigned int bdev_zone_no(struct block_device *bdev, sector_t sec)
1316 return disk_zone_no(bdev->bd_disk, sec);
1319 /* Whether write serialization is required for @op on zoned devices. */
1320 static inline bool op_needs_zoned_write_locking(enum req_op op)
1322 return op == REQ_OP_WRITE || op == REQ_OP_WRITE_ZEROES;
1325 static inline bool bdev_op_is_zoned_write(struct block_device *bdev,
1328 return bdev_is_zoned(bdev) && op_needs_zoned_write_locking(op);
1331 static inline sector_t bdev_zone_sectors(struct block_device *bdev)
1333 struct request_queue *q = bdev_get_queue(bdev);
1335 if (!blk_queue_is_zoned(q))
1337 return q->limits.chunk_sectors;
1340 static inline sector_t bdev_offset_from_zone_start(struct block_device *bdev,
1343 return sector & (bdev_zone_sectors(bdev) - 1);
1346 static inline bool bdev_is_zone_start(struct block_device *bdev,
1349 return bdev_offset_from_zone_start(bdev, sector) == 0;
1352 static inline int queue_dma_alignment(const struct request_queue *q)
1354 return q ? q->limits.dma_alignment : 511;
1357 static inline unsigned int bdev_dma_alignment(struct block_device *bdev)
1359 return queue_dma_alignment(bdev_get_queue(bdev));
1362 static inline bool bdev_iter_is_aligned(struct block_device *bdev,
1363 struct iov_iter *iter)
1365 return iov_iter_is_aligned(iter, bdev_dma_alignment(bdev),
1366 bdev_logical_block_size(bdev) - 1);
1369 static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
1372 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
1373 return !(addr & alignment) && !(len & alignment);
1376 /* assumes size > 256 */
1377 static inline unsigned int blksize_bits(unsigned int size)
1379 return order_base_2(size >> SECTOR_SHIFT) + SECTOR_SHIFT;
1382 static inline unsigned int block_size(struct block_device *bdev)
1384 return 1 << bdev->bd_inode->i_blkbits;
1387 int kblockd_schedule_work(struct work_struct *work);
1388 int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
1390 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1391 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1392 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1393 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1395 #ifdef CONFIG_BLK_INLINE_ENCRYPTION
1397 bool blk_crypto_register(struct blk_crypto_profile *profile,
1398 struct request_queue *q);
1400 #else /* CONFIG_BLK_INLINE_ENCRYPTION */
1402 static inline bool blk_crypto_register(struct blk_crypto_profile *profile,
1403 struct request_queue *q)
1408 #endif /* CONFIG_BLK_INLINE_ENCRYPTION */
1410 enum blk_unique_id {
1411 /* these match the Designator Types specified in SPC */
1417 struct block_device_operations {
1418 void (*submit_bio)(struct bio *bio);
1419 int (*poll_bio)(struct bio *bio, struct io_comp_batch *iob,
1420 unsigned int flags);
1421 int (*open)(struct gendisk *disk, blk_mode_t mode);
1422 void (*release)(struct gendisk *disk);
1423 int (*ioctl)(struct block_device *bdev, blk_mode_t mode,
1424 unsigned cmd, unsigned long arg);
1425 int (*compat_ioctl)(struct block_device *bdev, blk_mode_t mode,
1426 unsigned cmd, unsigned long arg);
1427 unsigned int (*check_events) (struct gendisk *disk,
1428 unsigned int clearing);
1429 void (*unlock_native_capacity) (struct gendisk *);
1430 int (*getgeo)(struct block_device *, struct hd_geometry *);
1431 int (*set_read_only)(struct block_device *bdev, bool ro);
1432 void (*free_disk)(struct gendisk *disk);
1433 /* this callback is with swap_lock and sometimes page table lock held */
1434 void (*swap_slot_free_notify) (struct block_device *, unsigned long);
1435 int (*report_zones)(struct gendisk *, sector_t sector,
1436 unsigned int nr_zones, report_zones_cb cb, void *data);
1437 char *(*devnode)(struct gendisk *disk, umode_t *mode);
1438 /* returns the length of the identifier or a negative errno: */
1439 int (*get_unique_id)(struct gendisk *disk, u8 id[16],
1440 enum blk_unique_id id_type);
1441 struct module *owner;
1442 const struct pr_ops *pr_ops;
1445 * Special callback for probing GPT entry at a given sector.
1446 * Needed by Android devices, used by GPT scanner and MMC blk
1449 int (*alternative_gpt_sector)(struct gendisk *disk, sector_t *sector);
1452 #ifdef CONFIG_COMPAT
1453 extern int blkdev_compat_ptr_ioctl(struct block_device *, blk_mode_t,
1454 unsigned int, unsigned long);
1456 #define blkdev_compat_ptr_ioctl NULL
1459 static inline void blk_wake_io_task(struct task_struct *waiter)
1462 * If we're polling, the task itself is doing the completions. For
1463 * that case, we don't need to signal a wakeup, it's enough to just
1464 * mark us as RUNNING.
1466 if (waiter == current)
1467 __set_current_state(TASK_RUNNING);
1469 wake_up_process(waiter);
1472 unsigned long bdev_start_io_acct(struct block_device *bdev, enum req_op op,
1473 unsigned long start_time);
1474 void bdev_end_io_acct(struct block_device *bdev, enum req_op op,
1475 unsigned int sectors, unsigned long start_time);
1477 unsigned long bio_start_io_acct(struct bio *bio);
1478 void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time,
1479 struct block_device *orig_bdev);
1482 * bio_end_io_acct - end I/O accounting for bio based drivers
1483 * @bio: bio to end account for
1484 * @start_time: start time returned by bio_start_io_acct()
1486 static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time)
1488 return bio_end_io_acct_remapped(bio, start_time, bio->bi_bdev);
1491 int bdev_read_only(struct block_device *bdev);
1492 int set_blocksize(struct block_device *bdev, int size);
1494 int lookup_bdev(const char *pathname, dev_t *dev);
1496 void blkdev_show(struct seq_file *seqf, off_t offset);
1498 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1499 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
1501 #define BLKDEV_MAJOR_MAX 512
1503 #define BLKDEV_MAJOR_MAX 0
1506 struct blk_holder_ops {
1507 void (*mark_dead)(struct block_device *bdev, bool surprise);
1510 * Sync the file system mounted on the block device.
1512 void (*sync)(struct block_device *bdev);
1515 * Freeze the file system mounted on the block device.
1517 int (*freeze)(struct block_device *bdev);
1520 * Thaw the file system mounted on the block device.
1522 int (*thaw)(struct block_device *bdev);
1526 * For filesystems using @fs_holder_ops, the @holder argument passed to
1527 * helpers used to open and claim block devices via
1528 * bd_prepare_to_claim() must point to a superblock.
1530 extern const struct blk_holder_ops fs_holder_ops;
1533 * Return the correct open flags for blkdev_get_by_* for super block flags
1534 * as stored in sb->s_flags.
1536 #define sb_open_mode(flags) \
1537 (BLK_OPEN_READ | BLK_OPEN_RESTRICT_WRITES | \
1538 (((flags) & SB_RDONLY) ? 0 : BLK_OPEN_WRITE))
1540 struct file *bdev_file_open_by_dev(dev_t dev, blk_mode_t mode, void *holder,
1541 const struct blk_holder_ops *hops);
1542 struct file *bdev_file_open_by_path(const char *path, blk_mode_t mode,
1543 void *holder, const struct blk_holder_ops *hops);
1544 int bd_prepare_to_claim(struct block_device *bdev, void *holder,
1545 const struct blk_holder_ops *hops);
1546 void bd_abort_claiming(struct block_device *bdev, void *holder);
1548 /* just for blk-cgroup, don't use elsewhere */
1549 struct block_device *blkdev_get_no_open(dev_t dev);
1550 void blkdev_put_no_open(struct block_device *bdev);
1552 struct block_device *I_BDEV(struct inode *inode);
1553 struct block_device *file_bdev(struct file *bdev_file);
1556 void invalidate_bdev(struct block_device *bdev);
1557 int sync_blockdev(struct block_device *bdev);
1558 int sync_blockdev_range(struct block_device *bdev, loff_t lstart, loff_t lend);
1559 int sync_blockdev_nowait(struct block_device *bdev);
1560 void sync_bdevs(bool wait);
1561 void bdev_statx_dioalign(struct inode *inode, struct kstat *stat);
1562 void printk_all_partitions(void);
1563 int __init early_lookup_bdev(const char *pathname, dev_t *dev);
1565 static inline void invalidate_bdev(struct block_device *bdev)
1568 static inline int sync_blockdev(struct block_device *bdev)
1572 static inline int sync_blockdev_nowait(struct block_device *bdev)
1576 static inline void sync_bdevs(bool wait)
1579 static inline void bdev_statx_dioalign(struct inode *inode, struct kstat *stat)
1582 static inline void printk_all_partitions(void)
1585 static inline int early_lookup_bdev(const char *pathname, dev_t *dev)
1589 #endif /* CONFIG_BLOCK */
1591 int bdev_freeze(struct block_device *bdev);
1592 int bdev_thaw(struct block_device *bdev);
1593 void bdev_fput(struct file *bdev_file);
1595 struct io_comp_batch {
1596 struct request *req_list;
1598 void (*complete)(struct io_comp_batch *);
1601 #define DEFINE_IO_COMP_BATCH(name) struct io_comp_batch name = { }
1603 #endif /* _LINUX_BLKDEV_H */