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 enum blk_integrity_checksum {
109 BLK_INTEGRITY_CSUM_NONE = 0,
110 BLK_INTEGRITY_CSUM_IP = 1,
111 BLK_INTEGRITY_CSUM_CRC = 2,
112 BLK_INTEGRITY_CSUM_CRC64 = 3,
115 struct blk_integrity {
117 enum blk_integrity_checksum csum_type;
118 unsigned char tuple_size;
119 unsigned char pi_offset;
120 unsigned char interval_exp;
121 unsigned char tag_size;
124 typedef unsigned int __bitwise blk_mode_t;
126 /* open for reading */
127 #define BLK_OPEN_READ ((__force blk_mode_t)(1 << 0))
128 /* open for writing */
129 #define BLK_OPEN_WRITE ((__force blk_mode_t)(1 << 1))
130 /* open exclusively (vs other exclusive openers */
131 #define BLK_OPEN_EXCL ((__force blk_mode_t)(1 << 2))
132 /* opened with O_NDELAY */
133 #define BLK_OPEN_NDELAY ((__force blk_mode_t)(1 << 3))
134 /* open for "writes" only for ioctls (specialy hack for floppy.c) */
135 #define BLK_OPEN_WRITE_IOCTL ((__force blk_mode_t)(1 << 4))
136 /* open is exclusive wrt all other BLK_OPEN_WRITE opens to the device */
137 #define BLK_OPEN_RESTRICT_WRITES ((__force blk_mode_t)(1 << 5))
138 /* return partition scanning errors */
139 #define BLK_OPEN_STRICT_SCAN ((__force blk_mode_t)(1 << 6))
143 * major/first_minor/minors should not be set by any new driver, the
144 * block core will take care of allocating them automatically.
150 char disk_name[DISK_NAME_LEN]; /* name of major driver */
152 unsigned short events; /* supported events */
153 unsigned short event_flags; /* flags related to event processing */
155 struct xarray part_tbl;
156 struct block_device *part0;
158 const struct block_device_operations *fops;
159 struct request_queue *queue;
162 struct bio_set bio_split;
166 #define GD_NEED_PART_SCAN 0
167 #define GD_READ_ONLY 1
169 #define GD_NATIVE_CAPACITY 3
171 #define GD_SUPPRESS_PART_SCAN 5
172 #define GD_OWNS_QUEUE 6
174 struct mutex open_mutex; /* open/close mutex */
175 unsigned open_partitions; /* number of open partitions */
177 struct backing_dev_info *bdi;
178 struct kobject queue_kobj; /* the queue/ directory */
179 struct kobject *slave_dir;
180 #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED
181 struct list_head slave_bdevs;
183 struct timer_rand_state *random;
184 atomic_t sync_io; /* RAID */
185 struct disk_events *ev;
187 #ifdef CONFIG_BLK_DEV_ZONED
189 * Zoned block device information. Reads of this information must be
190 * protected with blk_queue_enter() / blk_queue_exit(). Modifying this
191 * information is only allowed while no requests are being processed.
192 * See also blk_mq_freeze_queue() and blk_mq_unfreeze_queue().
194 unsigned int nr_zones;
195 unsigned int zone_capacity;
196 unsigned int last_zone_capacity;
197 unsigned long *conv_zones_bitmap;
198 unsigned int zone_wplugs_hash_bits;
199 spinlock_t zone_wplugs_lock;
200 struct mempool_s *zone_wplugs_pool;
201 struct hlist_head *zone_wplugs_hash;
202 struct list_head zone_wplugs_err_list;
203 struct work_struct zone_wplugs_work;
204 struct workqueue_struct *zone_wplugs_wq;
205 #endif /* CONFIG_BLK_DEV_ZONED */
207 #if IS_ENABLED(CONFIG_CDROM)
208 struct cdrom_device_info *cdi;
211 struct badblocks *bb;
212 struct lockdep_map lockdep_map;
214 blk_mode_t open_mode;
217 * Independent sector access ranges. This is always NULL for
218 * devices that do not have multiple independent access ranges.
220 struct blk_independent_access_ranges *ia_ranges;
224 * disk_openers - returns how many openers are there for a disk
225 * @disk: disk to check
227 * This returns the number of openers for a disk. Note that this value is only
228 * stable if disk->open_mutex is held.
230 * Note: Due to a quirk in the block layer open code, each open partition is
231 * only counted once even if there are multiple openers.
233 static inline unsigned int disk_openers(struct gendisk *disk)
235 return atomic_read(&disk->part0->bd_openers);
239 * disk_has_partscan - return %true if partition scanning is enabled on a disk
240 * @disk: disk to check
242 * Returns %true if partitions scanning is enabled for @disk, or %false if
243 * partition scanning is disabled either permanently or temporarily.
245 static inline bool disk_has_partscan(struct gendisk *disk)
247 return !(disk->flags & (GENHD_FL_NO_PART | GENHD_FL_HIDDEN)) &&
248 !test_bit(GD_SUPPRESS_PART_SCAN, &disk->state);
252 * The gendisk is refcounted by the part0 block_device, and the bd_device
253 * therein is also used for device model presentation in sysfs.
255 #define dev_to_disk(device) \
256 (dev_to_bdev(device)->bd_disk)
257 #define disk_to_dev(disk) \
258 (&((disk)->part0->bd_device))
260 #if IS_REACHABLE(CONFIG_CDROM)
261 #define disk_to_cdi(disk) ((disk)->cdi)
263 #define disk_to_cdi(disk) NULL
266 static inline dev_t disk_devt(struct gendisk *disk)
268 return MKDEV(disk->major, disk->first_minor);
271 /* blk_validate_limits() validates bsize, so drivers don't usually need to */
272 static inline int blk_validate_block_size(unsigned long bsize)
274 if (bsize < 512 || bsize > PAGE_SIZE || !is_power_of_2(bsize))
280 static inline bool blk_op_is_passthrough(blk_opf_t op)
283 return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT;
286 /* flags set by the driver in queue_limits.features */
287 typedef unsigned int __bitwise blk_features_t;
289 /* supports a volatile write cache */
290 #define BLK_FEAT_WRITE_CACHE ((__force blk_features_t)(1u << 0))
292 /* supports passing on the FUA bit */
293 #define BLK_FEAT_FUA ((__force blk_features_t)(1u << 1))
295 /* rotational device (hard drive or floppy) */
296 #define BLK_FEAT_ROTATIONAL ((__force blk_features_t)(1u << 2))
298 /* contributes to the random number pool */
299 #define BLK_FEAT_ADD_RANDOM ((__force blk_features_t)(1u << 3))
301 /* do disk/partitions IO accounting */
302 #define BLK_FEAT_IO_STAT ((__force blk_features_t)(1u << 4))
304 /* don't modify data until writeback is done */
305 #define BLK_FEAT_STABLE_WRITES ((__force blk_features_t)(1u << 5))
307 /* always completes in submit context */
308 #define BLK_FEAT_SYNCHRONOUS ((__force blk_features_t)(1u << 6))
310 /* supports REQ_NOWAIT */
311 #define BLK_FEAT_NOWAIT ((__force blk_features_t)(1u << 7))
314 #define BLK_FEAT_DAX ((__force blk_features_t)(1u << 8))
316 /* supports I/O polling */
317 #define BLK_FEAT_POLL ((__force blk_features_t)(1u << 9))
319 /* is a zoned device */
320 #define BLK_FEAT_ZONED ((__force blk_features_t)(1u << 10))
322 /* supports PCI(e) p2p requests */
323 #define BLK_FEAT_PCI_P2PDMA ((__force blk_features_t)(1u << 12))
325 /* skip this queue in blk_mq_(un)quiesce_tagset */
326 #define BLK_FEAT_SKIP_TAGSET_QUIESCE ((__force blk_features_t)(1u << 13))
328 /* bounce all highmem pages */
329 #define BLK_FEAT_BOUNCE_HIGH ((__force blk_features_t)(1u << 14))
331 /* undocumented magic for bcache */
332 #define BLK_FEAT_RAID_PARTIAL_STRIPES_EXPENSIVE \
333 ((__force blk_features_t)(1u << 15))
336 * Flags automatically inherited when stacking limits.
338 #define BLK_FEAT_INHERIT_MASK \
339 (BLK_FEAT_WRITE_CACHE | BLK_FEAT_FUA | BLK_FEAT_ROTATIONAL | \
340 BLK_FEAT_STABLE_WRITES | BLK_FEAT_ZONED | BLK_FEAT_BOUNCE_HIGH | \
341 BLK_FEAT_RAID_PARTIAL_STRIPES_EXPENSIVE)
343 /* internal flags in queue_limits.flags */
344 typedef unsigned int __bitwise blk_flags_t;
346 /* do not send FLUSH/FUA commands despite advertising a write cache */
347 #define BLK_FLAG_WRITE_CACHE_DISABLED ((__force blk_flags_t)(1u << 0))
349 /* I/O topology is misaligned */
350 #define BLK_FLAG_MISALIGNED ((__force blk_flags_t)(1u << 1))
352 struct queue_limits {
353 blk_features_t features;
355 unsigned long seg_boundary_mask;
356 unsigned long virt_boundary_mask;
358 unsigned int max_hw_sectors;
359 unsigned int max_dev_sectors;
360 unsigned int chunk_sectors;
361 unsigned int max_sectors;
362 unsigned int max_user_sectors;
363 unsigned int max_segment_size;
364 unsigned int physical_block_size;
365 unsigned int logical_block_size;
366 unsigned int alignment_offset;
369 unsigned int max_discard_sectors;
370 unsigned int max_hw_discard_sectors;
371 unsigned int max_user_discard_sectors;
372 unsigned int max_secure_erase_sectors;
373 unsigned int max_write_zeroes_sectors;
374 unsigned int max_zone_append_sectors;
375 unsigned int discard_granularity;
376 unsigned int discard_alignment;
377 unsigned int zone_write_granularity;
379 /* atomic write limits */
380 unsigned int atomic_write_hw_max;
381 unsigned int atomic_write_max_sectors;
382 unsigned int atomic_write_hw_boundary;
383 unsigned int atomic_write_boundary_sectors;
384 unsigned int atomic_write_hw_unit_min;
385 unsigned int atomic_write_unit_min;
386 unsigned int atomic_write_hw_unit_max;
387 unsigned int atomic_write_unit_max;
389 unsigned short max_segments;
390 unsigned short max_integrity_segments;
391 unsigned short max_discard_segments;
393 unsigned int max_open_zones;
394 unsigned int max_active_zones;
397 * Drivers that set dma_alignment to less than 511 must be prepared to
398 * handle individual bvec's that are not a multiple of a SECTOR_SIZE
399 * due to possible offsets.
401 unsigned int dma_alignment;
402 unsigned int dma_pad_mask;
404 struct blk_integrity integrity;
407 typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx,
410 #define BLK_ALL_ZONES ((unsigned int)-1)
411 int blkdev_report_zones(struct block_device *bdev, sector_t sector,
412 unsigned int nr_zones, report_zones_cb cb, void *data);
413 int blkdev_zone_mgmt(struct block_device *bdev, enum req_op op,
414 sector_t sectors, sector_t nr_sectors);
415 int blk_revalidate_disk_zones(struct gendisk *disk);
418 * Independent access ranges: struct blk_independent_access_range describes
419 * a range of contiguous sectors that can be accessed using device command
420 * execution resources that are independent from the resources used for
421 * other access ranges. This is typically found with single-LUN multi-actuator
422 * HDDs where each access range is served by a different set of heads.
423 * The set of independent ranges supported by the device is defined using
424 * struct blk_independent_access_ranges. The independent ranges must not overlap
425 * and must include all sectors within the disk capacity (no sector holes
427 * For a device with multiple ranges, requests targeting sectors in different
428 * ranges can be executed in parallel. A request can straddle an access range
431 struct blk_independent_access_range {
437 struct blk_independent_access_ranges {
439 bool sysfs_registered;
440 unsigned int nr_ia_ranges;
441 struct blk_independent_access_range ia_range[];
444 struct request_queue {
446 * The queue owner gets to use this for whatever they like.
447 * ll_rw_blk doesn't touch it.
451 struct elevator_queue *elevator;
453 const struct blk_mq_ops *mq_ops;
456 struct blk_mq_ctx __percpu *queue_ctx;
459 * various queue flags, see QUEUE_* below
461 unsigned long queue_flags;
463 unsigned int rq_timeout;
465 unsigned int queue_depth;
469 /* hw dispatch queues */
470 unsigned int nr_hw_queues;
471 struct xarray hctx_table;
473 struct percpu_ref q_usage_counter;
475 struct request *last_merge;
477 spinlock_t queue_lock;
481 struct gendisk *disk;
486 struct kobject *mq_kobj;
488 struct queue_limits limits;
492 enum rpm_status rpm_status;
496 * Number of contexts that have called blk_set_pm_only(). If this
497 * counter is above zero then only RQF_PM requests are processed.
501 struct blk_queue_stats *stats;
502 struct rq_qos *rq_qos;
503 struct mutex rq_qos_mutex;
506 * ida allocated id for this queue. Used to index queues from
514 unsigned long nr_requests; /* Max # of requests */
516 #ifdef CONFIG_BLK_INLINE_ENCRYPTION
517 struct blk_crypto_profile *crypto_profile;
518 struct kobject *crypto_kobject;
521 struct timer_list timeout;
522 struct work_struct timeout_work;
524 atomic_t nr_active_requests_shared_tags;
526 struct blk_mq_tags *sched_shared_tags;
528 struct list_head icq_list;
529 #ifdef CONFIG_BLK_CGROUP
530 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
531 struct blkcg_gq *root_blkg;
532 struct list_head blkg_list;
533 struct mutex blkcg_mutex;
538 spinlock_t requeue_lock;
539 struct list_head requeue_list;
540 struct delayed_work requeue_work;
542 #ifdef CONFIG_BLK_DEV_IO_TRACE
543 struct blk_trace __rcu *blk_trace;
546 * for flush operations
548 struct blk_flush_queue *fq;
549 struct list_head flush_list;
551 struct mutex sysfs_lock;
552 struct mutex sysfs_dir_lock;
553 struct mutex limits_lock;
556 * for reusing dead hctx instance in case of updating
559 struct list_head unused_hctx_list;
560 spinlock_t unused_hctx_lock;
564 #ifdef CONFIG_BLK_DEV_THROTTLING
566 struct throtl_data *td;
568 struct rcu_head rcu_head;
569 wait_queue_head_t mq_freeze_wq;
571 * Protect concurrent access to q_usage_counter by
572 * percpu_ref_kill() and percpu_ref_reinit().
574 struct mutex mq_freeze_lock;
576 struct blk_mq_tag_set *tag_set;
577 struct list_head tag_set_list;
579 struct dentry *debugfs_dir;
580 struct dentry *sched_debugfs_dir;
581 struct dentry *rqos_debugfs_dir;
583 * Serializes all debugfs metadata operations using the above dentries.
585 struct mutex debugfs_mutex;
587 bool mq_sysfs_init_done;
590 /* Keep blk_queue_flag_name[] in sync with the definitions below */
592 QUEUE_FLAG_DYING, /* queue being torn down */
593 QUEUE_FLAG_NOMERGES, /* disable merge attempts */
594 QUEUE_FLAG_SAME_COMP, /* complete on same CPU-group */
595 QUEUE_FLAG_FAIL_IO, /* fake timeout */
596 QUEUE_FLAG_NOXMERGES, /* No extended merges */
597 QUEUE_FLAG_SAME_FORCE, /* force complete on same CPU */
598 QUEUE_FLAG_INIT_DONE, /* queue is initialized */
599 QUEUE_FLAG_STATS, /* track IO start and completion times */
600 QUEUE_FLAG_REGISTERED, /* queue has been registered to a disk */
601 QUEUE_FLAG_QUIESCED, /* queue has been quiesced */
602 QUEUE_FLAG_RQ_ALLOC_TIME, /* record rq->alloc_time_ns */
603 QUEUE_FLAG_HCTX_ACTIVE, /* at least one blk-mq hctx is active */
604 QUEUE_FLAG_SQ_SCHED, /* single queue style io dispatch */
608 #define QUEUE_FLAG_MQ_DEFAULT (1UL << QUEUE_FLAG_SAME_COMP)
610 void blk_queue_flag_set(unsigned int flag, struct request_queue *q);
611 void blk_queue_flag_clear(unsigned int flag, struct request_queue *q);
613 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
614 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
615 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
616 #define blk_queue_noxmerges(q) \
617 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
618 #define blk_queue_nonrot(q) (!((q)->limits.features & BLK_FEAT_ROTATIONAL))
619 #define blk_queue_io_stat(q) ((q)->limits.features & BLK_FEAT_IO_STAT)
620 #define blk_queue_dax(q) ((q)->limits.features & BLK_FEAT_DAX)
621 #define blk_queue_pci_p2pdma(q) ((q)->limits.features & BLK_FEAT_PCI_P2PDMA)
622 #ifdef CONFIG_BLK_RQ_ALLOC_TIME
623 #define blk_queue_rq_alloc_time(q) \
624 test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags)
626 #define blk_queue_rq_alloc_time(q) false
629 #define blk_noretry_request(rq) \
630 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
631 REQ_FAILFAST_DRIVER))
632 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
633 #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only)
634 #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags)
635 #define blk_queue_sq_sched(q) test_bit(QUEUE_FLAG_SQ_SCHED, &(q)->queue_flags)
636 #define blk_queue_skip_tagset_quiesce(q) \
637 ((q)->limits.features & BLK_FEAT_SKIP_TAGSET_QUIESCE)
639 extern void blk_set_pm_only(struct request_queue *q);
640 extern void blk_clear_pm_only(struct request_queue *q);
642 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
644 #define dma_map_bvec(dev, bv, dir, attrs) \
645 dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \
648 static inline bool queue_is_mq(struct request_queue *q)
654 static inline enum rpm_status queue_rpm_status(struct request_queue *q)
656 return q->rpm_status;
659 static inline enum rpm_status queue_rpm_status(struct request_queue *q)
665 static inline bool blk_queue_is_zoned(struct request_queue *q)
667 return IS_ENABLED(CONFIG_BLK_DEV_ZONED) &&
668 (q->limits.features & BLK_FEAT_ZONED);
671 #ifdef CONFIG_BLK_DEV_ZONED
672 static inline unsigned int disk_nr_zones(struct gendisk *disk)
674 return disk->nr_zones;
676 bool blk_zone_plug_bio(struct bio *bio, unsigned int nr_segs);
677 #else /* CONFIG_BLK_DEV_ZONED */
678 static inline unsigned int disk_nr_zones(struct gendisk *disk)
682 static inline bool blk_zone_plug_bio(struct bio *bio, unsigned int nr_segs)
686 #endif /* CONFIG_BLK_DEV_ZONED */
688 static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector)
690 if (!blk_queue_is_zoned(disk->queue))
692 return sector >> ilog2(disk->queue->limits.chunk_sectors);
695 static inline unsigned int bdev_nr_zones(struct block_device *bdev)
697 return disk_nr_zones(bdev->bd_disk);
700 static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
702 return bdev->bd_disk->queue->limits.max_open_zones;
705 static inline unsigned int bdev_max_active_zones(struct block_device *bdev)
707 return bdev->bd_disk->queue->limits.max_active_zones;
710 static inline unsigned int blk_queue_depth(struct request_queue *q)
713 return q->queue_depth;
715 return q->nr_requests;
719 * default timeout for SG_IO if none specified
721 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
722 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
724 /* This should not be used directly - use rq_for_each_segment */
725 #define for_each_bio(_bio) \
726 for (; _bio; _bio = _bio->bi_next)
728 int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
729 const struct attribute_group **groups);
730 static inline int __must_check add_disk(struct gendisk *disk)
732 return device_add_disk(NULL, disk, NULL);
734 void del_gendisk(struct gendisk *gp);
735 void invalidate_disk(struct gendisk *disk);
736 void set_disk_ro(struct gendisk *disk, bool read_only);
737 void disk_uevent(struct gendisk *disk, enum kobject_action action);
739 static inline u8 bdev_partno(const struct block_device *bdev)
741 return atomic_read(&bdev->__bd_flags) & BD_PARTNO;
744 static inline bool bdev_test_flag(const struct block_device *bdev, unsigned flag)
746 return atomic_read(&bdev->__bd_flags) & flag;
749 static inline void bdev_set_flag(struct block_device *bdev, unsigned flag)
751 atomic_or(flag, &bdev->__bd_flags);
754 static inline void bdev_clear_flag(struct block_device *bdev, unsigned flag)
756 atomic_andnot(flag, &bdev->__bd_flags);
759 static inline int get_disk_ro(struct gendisk *disk)
761 return bdev_test_flag(disk->part0, BD_READ_ONLY) ||
762 test_bit(GD_READ_ONLY, &disk->state);
765 static inline int bdev_read_only(struct block_device *bdev)
767 return bdev_test_flag(bdev, BD_READ_ONLY) || get_disk_ro(bdev->bd_disk);
770 bool set_capacity_and_notify(struct gendisk *disk, sector_t size);
771 void disk_force_media_change(struct gendisk *disk);
772 void bdev_mark_dead(struct block_device *bdev, bool surprise);
774 void add_disk_randomness(struct gendisk *disk) __latent_entropy;
775 void rand_initialize_disk(struct gendisk *disk);
777 static inline sector_t get_start_sect(struct block_device *bdev)
779 return bdev->bd_start_sect;
782 static inline sector_t bdev_nr_sectors(struct block_device *bdev)
784 return bdev->bd_nr_sectors;
787 static inline loff_t bdev_nr_bytes(struct block_device *bdev)
789 return (loff_t)bdev_nr_sectors(bdev) << SECTOR_SHIFT;
792 static inline sector_t get_capacity(struct gendisk *disk)
794 return bdev_nr_sectors(disk->part0);
797 static inline u64 sb_bdev_nr_blocks(struct super_block *sb)
799 return bdev_nr_sectors(sb->s_bdev) >>
800 (sb->s_blocksize_bits - SECTOR_SHIFT);
803 int bdev_disk_changed(struct gendisk *disk, bool invalidate);
805 void put_disk(struct gendisk *disk);
806 struct gendisk *__blk_alloc_disk(struct queue_limits *lim, int node,
807 struct lock_class_key *lkclass);
810 * blk_alloc_disk - allocate a gendisk structure
811 * @lim: queue limits to be used for this disk.
812 * @node_id: numa node to allocate on
814 * Allocate and pre-initialize a gendisk structure for use with BIO based
817 * Returns an ERR_PTR on error, else the allocated disk.
821 #define blk_alloc_disk(lim, node_id) \
823 static struct lock_class_key __key; \
825 __blk_alloc_disk(lim, node_id, &__key); \
828 int __register_blkdev(unsigned int major, const char *name,
829 void (*probe)(dev_t devt));
830 #define register_blkdev(major, name) \
831 __register_blkdev(major, name, NULL)
832 void unregister_blkdev(unsigned int major, const char *name);
834 bool disk_check_media_change(struct gendisk *disk);
835 void set_capacity(struct gendisk *disk, sector_t size);
837 #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED
838 int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
839 void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk);
841 static inline int bd_link_disk_holder(struct block_device *bdev,
842 struct gendisk *disk)
846 static inline void bd_unlink_disk_holder(struct block_device *bdev,
847 struct gendisk *disk)
850 #endif /* CONFIG_BLOCK_HOLDER_DEPRECATED */
852 dev_t part_devt(struct gendisk *disk, u8 partno);
853 void inc_diskseq(struct gendisk *disk);
854 void blk_request_module(dev_t devt);
856 extern int blk_register_queue(struct gendisk *disk);
857 extern void blk_unregister_queue(struct gendisk *disk);
858 void submit_bio_noacct(struct bio *bio);
859 struct bio *bio_split_to_limits(struct bio *bio);
861 extern int blk_lld_busy(struct request_queue *q);
862 extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags);
863 extern void blk_queue_exit(struct request_queue *q);
864 extern void blk_sync_queue(struct request_queue *q);
866 /* Helper to convert REQ_OP_XXX to its string format XXX */
867 extern const char *blk_op_str(enum req_op op);
869 int blk_status_to_errno(blk_status_t status);
870 blk_status_t errno_to_blk_status(int errno);
871 const char *blk_status_to_str(blk_status_t status);
873 /* only poll the hardware once, don't continue until a completion was found */
874 #define BLK_POLL_ONESHOT (1 << 0)
875 int bio_poll(struct bio *bio, struct io_comp_batch *iob, unsigned int flags);
876 int iocb_bio_iopoll(struct kiocb *kiocb, struct io_comp_batch *iob,
879 static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
881 return bdev->bd_queue; /* this is never NULL */
884 /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */
885 const char *blk_zone_cond_str(enum blk_zone_cond zone_cond);
887 static inline unsigned int bio_zone_no(struct bio *bio)
889 return disk_zone_no(bio->bi_bdev->bd_disk, bio->bi_iter.bi_sector);
892 static inline bool bio_straddles_zones(struct bio *bio)
894 return bio_sectors(bio) &&
896 disk_zone_no(bio->bi_bdev->bd_disk, bio_end_sector(bio) - 1);
900 * Return how much within the boundary is left to be used for I/O at a given
903 static inline unsigned int blk_boundary_sectors_left(sector_t offset,
904 unsigned int boundary_sectors)
906 if (unlikely(!is_power_of_2(boundary_sectors)))
907 return boundary_sectors - sector_div(offset, boundary_sectors);
908 return boundary_sectors - (offset & (boundary_sectors - 1));
912 * queue_limits_start_update - start an atomic update of queue limits
913 * @q: queue to update
915 * This functions starts an atomic update of the queue limits. It takes a lock
916 * to prevent other updates and returns a snapshot of the current limits that
917 * the caller can modify. The caller must call queue_limits_commit_update()
918 * to finish the update.
920 * Context: process context. The caller must have frozen the queue or ensured
921 * that there is outstanding I/O by other means.
923 static inline struct queue_limits
924 queue_limits_start_update(struct request_queue *q)
926 mutex_lock(&q->limits_lock);
929 int queue_limits_commit_update(struct request_queue *q,
930 struct queue_limits *lim);
931 int queue_limits_set(struct request_queue *q, struct queue_limits *lim);
934 * queue_limits_cancel_update - cancel an atomic update of queue limits
935 * @q: queue to update
937 * This functions cancels an atomic update of the queue limits started by
938 * queue_limits_start_update() and should be used when an error occurs after
941 static inline void queue_limits_cancel_update(struct request_queue *q)
943 mutex_unlock(&q->limits_lock);
947 * These helpers are for drivers that have sloppy feature negotiation and might
948 * have to disable DISCARD, WRITE_ZEROES or SECURE_DISCARD from the I/O
949 * completion handler when the device returned an indicator that the respective
950 * feature is not actually supported. They are racy and the driver needs to
951 * cope with that. Try to avoid this scheme if you can.
953 static inline void blk_queue_disable_discard(struct request_queue *q)
955 q->limits.max_discard_sectors = 0;
958 static inline void blk_queue_disable_secure_erase(struct request_queue *q)
960 q->limits.max_secure_erase_sectors = 0;
963 static inline void blk_queue_disable_write_zeroes(struct request_queue *q)
965 q->limits.max_write_zeroes_sectors = 0;
969 * Access functions for manipulating queue properties
971 extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
972 extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
973 extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
974 extern void blk_set_stacking_limits(struct queue_limits *lim);
975 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
977 void queue_limits_stack_bdev(struct queue_limits *t, struct block_device *bdev,
978 sector_t offset, const char *pfx);
979 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
981 struct blk_independent_access_ranges *
982 disk_alloc_independent_access_ranges(struct gendisk *disk, int nr_ia_ranges);
983 void disk_set_independent_access_ranges(struct gendisk *disk,
984 struct blk_independent_access_ranges *iars);
986 bool __must_check blk_get_queue(struct request_queue *);
987 extern void blk_put_queue(struct request_queue *);
989 void blk_mark_disk_dead(struct gendisk *disk);
993 * blk_plug permits building a queue of related requests by holding the I/O
994 * fragments for a short period. This allows merging of sequential requests
995 * into single larger request. As the requests are moved from a per-task list to
996 * the device's request_queue in a batch, this results in improved scalability
997 * as the lock contention for request_queue lock is reduced.
999 * It is ok not to disable preemption when adding the request to the plug list
1000 * or when attempting a merge. For details, please see schedule() where
1001 * blk_flush_plug() is called.
1004 struct request *mq_list; /* blk-mq requests */
1006 /* if ios_left is > 1, we can batch tag/rq allocations */
1007 struct request *cached_rq;
1009 unsigned short nr_ios;
1011 unsigned short rq_count;
1013 bool multiple_queues;
1016 struct list_head cb_list; /* md requires an unplug callback */
1020 typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
1021 struct blk_plug_cb {
1022 struct list_head list;
1023 blk_plug_cb_fn callback;
1026 extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
1027 void *data, int size);
1028 extern void blk_start_plug(struct blk_plug *);
1029 extern void blk_start_plug_nr_ios(struct blk_plug *, unsigned short);
1030 extern void blk_finish_plug(struct blk_plug *);
1032 void __blk_flush_plug(struct blk_plug *plug, bool from_schedule);
1033 static inline void blk_flush_plug(struct blk_plug *plug, bool async)
1036 __blk_flush_plug(plug, async);
1040 * tsk == current here
1042 static inline void blk_plug_invalidate_ts(struct task_struct *tsk)
1044 struct blk_plug *plug = tsk->plug;
1047 plug->cur_ktime = 0;
1048 current->flags &= ~PF_BLOCK_TS;
1051 int blkdev_issue_flush(struct block_device *bdev);
1052 long nr_blockdev_pages(void);
1053 #else /* CONFIG_BLOCK */
1057 static inline void blk_start_plug_nr_ios(struct blk_plug *plug,
1058 unsigned short nr_ios)
1062 static inline void blk_start_plug(struct blk_plug *plug)
1066 static inline void blk_finish_plug(struct blk_plug *plug)
1070 static inline void blk_flush_plug(struct blk_plug *plug, bool async)
1074 static inline void blk_plug_invalidate_ts(struct task_struct *tsk)
1078 static inline int blkdev_issue_flush(struct block_device *bdev)
1083 static inline long nr_blockdev_pages(void)
1087 #endif /* CONFIG_BLOCK */
1089 extern void blk_io_schedule(void);
1091 int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1092 sector_t nr_sects, gfp_t gfp_mask);
1093 int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1094 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop);
1095 int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector,
1096 sector_t nr_sects, gfp_t gfp);
1098 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
1099 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
1100 #define BLKDEV_ZERO_KILLABLE (1 << 2) /* interruptible by fatal signals */
1102 extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1103 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
1105 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1106 sector_t nr_sects, gfp_t gfp_mask, unsigned flags);
1108 static inline int sb_issue_discard(struct super_block *sb, sector_t block,
1109 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
1111 return blkdev_issue_discard(sb->s_bdev,
1112 block << (sb->s_blocksize_bits -
1114 nr_blocks << (sb->s_blocksize_bits -
1118 static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
1119 sector_t nr_blocks, gfp_t gfp_mask)
1121 return blkdev_issue_zeroout(sb->s_bdev,
1122 block << (sb->s_blocksize_bits -
1124 nr_blocks << (sb->s_blocksize_bits -
1129 static inline bool bdev_is_partition(struct block_device *bdev)
1131 return bdev_partno(bdev) != 0;
1134 enum blk_default_limits {
1135 BLK_MAX_SEGMENTS = 128,
1136 BLK_SAFE_MAX_SECTORS = 255,
1137 BLK_MAX_SEGMENT_SIZE = 65536,
1138 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
1142 * Default upper limit for the software max_sectors limit used for
1143 * regular file system I/O. This can be increased through sysfs.
1145 * Not to be confused with the max_hw_sector limit that is entirely
1146 * controlled by the driver, usually based on hardware limits.
1148 #define BLK_DEF_MAX_SECTORS_CAP 2560u
1150 static inline unsigned long queue_segment_boundary(const struct request_queue *q)
1152 return q->limits.seg_boundary_mask;
1155 static inline unsigned long queue_virt_boundary(const struct request_queue *q)
1157 return q->limits.virt_boundary_mask;
1160 static inline unsigned int queue_max_sectors(const struct request_queue *q)
1162 return q->limits.max_sectors;
1165 static inline unsigned int queue_max_bytes(struct request_queue *q)
1167 return min_t(unsigned int, queue_max_sectors(q), INT_MAX >> 9) << 9;
1170 static inline unsigned int queue_max_hw_sectors(const struct request_queue *q)
1172 return q->limits.max_hw_sectors;
1175 static inline unsigned short queue_max_segments(const struct request_queue *q)
1177 return q->limits.max_segments;
1180 static inline unsigned short queue_max_discard_segments(const struct request_queue *q)
1182 return q->limits.max_discard_segments;
1185 static inline unsigned int queue_max_segment_size(const struct request_queue *q)
1187 return q->limits.max_segment_size;
1190 static inline unsigned int queue_limits_max_zone_append_sectors(struct queue_limits *l)
1192 unsigned int max_sectors = min(l->chunk_sectors, l->max_hw_sectors);
1194 return min_not_zero(l->max_zone_append_sectors, max_sectors);
1197 static inline unsigned int queue_max_zone_append_sectors(struct request_queue *q)
1199 if (!blk_queue_is_zoned(q))
1202 return queue_limits_max_zone_append_sectors(&q->limits);
1205 static inline bool queue_emulates_zone_append(struct request_queue *q)
1207 return blk_queue_is_zoned(q) && !q->limits.max_zone_append_sectors;
1210 static inline bool bdev_emulates_zone_append(struct block_device *bdev)
1212 return queue_emulates_zone_append(bdev_get_queue(bdev));
1215 static inline unsigned int
1216 bdev_max_zone_append_sectors(struct block_device *bdev)
1218 return queue_max_zone_append_sectors(bdev_get_queue(bdev));
1221 static inline unsigned int bdev_max_segments(struct block_device *bdev)
1223 return queue_max_segments(bdev_get_queue(bdev));
1226 static inline unsigned queue_logical_block_size(const struct request_queue *q)
1228 return q->limits.logical_block_size;
1231 static inline unsigned int bdev_logical_block_size(struct block_device *bdev)
1233 return queue_logical_block_size(bdev_get_queue(bdev));
1236 static inline unsigned int queue_physical_block_size(const struct request_queue *q)
1238 return q->limits.physical_block_size;
1241 static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
1243 return queue_physical_block_size(bdev_get_queue(bdev));
1246 static inline unsigned int queue_io_min(const struct request_queue *q)
1248 return q->limits.io_min;
1251 static inline int bdev_io_min(struct block_device *bdev)
1253 return queue_io_min(bdev_get_queue(bdev));
1256 static inline unsigned int queue_io_opt(const struct request_queue *q)
1258 return q->limits.io_opt;
1261 static inline int bdev_io_opt(struct block_device *bdev)
1263 return queue_io_opt(bdev_get_queue(bdev));
1266 static inline unsigned int
1267 queue_zone_write_granularity(const struct request_queue *q)
1269 return q->limits.zone_write_granularity;
1272 static inline unsigned int
1273 bdev_zone_write_granularity(struct block_device *bdev)
1275 return queue_zone_write_granularity(bdev_get_queue(bdev));
1278 int bdev_alignment_offset(struct block_device *bdev);
1279 unsigned int bdev_discard_alignment(struct block_device *bdev);
1281 static inline unsigned int bdev_max_discard_sectors(struct block_device *bdev)
1283 return bdev_get_queue(bdev)->limits.max_discard_sectors;
1286 static inline unsigned int bdev_discard_granularity(struct block_device *bdev)
1288 return bdev_get_queue(bdev)->limits.discard_granularity;
1291 static inline unsigned int
1292 bdev_max_secure_erase_sectors(struct block_device *bdev)
1294 return bdev_get_queue(bdev)->limits.max_secure_erase_sectors;
1297 static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
1299 struct request_queue *q = bdev_get_queue(bdev);
1302 return q->limits.max_write_zeroes_sectors;
1307 static inline bool bdev_nonrot(struct block_device *bdev)
1309 return blk_queue_nonrot(bdev_get_queue(bdev));
1312 static inline bool bdev_synchronous(struct block_device *bdev)
1314 return bdev->bd_disk->queue->limits.features & BLK_FEAT_SYNCHRONOUS;
1317 static inline bool bdev_stable_writes(struct block_device *bdev)
1319 struct request_queue *q = bdev_get_queue(bdev);
1321 if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY) &&
1322 q->limits.integrity.csum_type != BLK_INTEGRITY_CSUM_NONE)
1324 return q->limits.features & BLK_FEAT_STABLE_WRITES;
1327 static inline bool blk_queue_write_cache(struct request_queue *q)
1329 return (q->limits.features & BLK_FEAT_WRITE_CACHE) &&
1330 !(q->limits.flags & BLK_FLAG_WRITE_CACHE_DISABLED);
1333 static inline bool bdev_write_cache(struct block_device *bdev)
1335 return blk_queue_write_cache(bdev_get_queue(bdev));
1338 static inline bool bdev_fua(struct block_device *bdev)
1340 return bdev_get_queue(bdev)->limits.features & BLK_FEAT_FUA;
1343 static inline bool bdev_nowait(struct block_device *bdev)
1345 return bdev->bd_disk->queue->limits.features & BLK_FEAT_NOWAIT;
1348 static inline bool bdev_is_zoned(struct block_device *bdev)
1350 return blk_queue_is_zoned(bdev_get_queue(bdev));
1353 static inline unsigned int bdev_zone_no(struct block_device *bdev, sector_t sec)
1355 return disk_zone_no(bdev->bd_disk, sec);
1358 static inline sector_t bdev_zone_sectors(struct block_device *bdev)
1360 struct request_queue *q = bdev_get_queue(bdev);
1362 if (!blk_queue_is_zoned(q))
1364 return q->limits.chunk_sectors;
1367 static inline sector_t bdev_offset_from_zone_start(struct block_device *bdev,
1370 return sector & (bdev_zone_sectors(bdev) - 1);
1373 static inline sector_t bio_offset_from_zone_start(struct bio *bio)
1375 return bdev_offset_from_zone_start(bio->bi_bdev,
1376 bio->bi_iter.bi_sector);
1379 static inline bool bdev_is_zone_start(struct block_device *bdev,
1382 return bdev_offset_from_zone_start(bdev, sector) == 0;
1385 static inline int queue_dma_alignment(const struct request_queue *q)
1387 return q->limits.dma_alignment;
1390 static inline unsigned int
1391 queue_atomic_write_unit_max_bytes(const struct request_queue *q)
1393 return q->limits.atomic_write_unit_max;
1396 static inline unsigned int
1397 queue_atomic_write_unit_min_bytes(const struct request_queue *q)
1399 return q->limits.atomic_write_unit_min;
1402 static inline unsigned int
1403 queue_atomic_write_boundary_bytes(const struct request_queue *q)
1405 return q->limits.atomic_write_boundary_sectors << SECTOR_SHIFT;
1408 static inline unsigned int
1409 queue_atomic_write_max_bytes(const struct request_queue *q)
1411 return q->limits.atomic_write_max_sectors << SECTOR_SHIFT;
1414 static inline unsigned int bdev_dma_alignment(struct block_device *bdev)
1416 return queue_dma_alignment(bdev_get_queue(bdev));
1419 static inline bool bdev_iter_is_aligned(struct block_device *bdev,
1420 struct iov_iter *iter)
1422 return iov_iter_is_aligned(iter, bdev_dma_alignment(bdev),
1423 bdev_logical_block_size(bdev) - 1);
1426 static inline int blk_lim_dma_alignment_and_pad(struct queue_limits *lim)
1428 return lim->dma_alignment | lim->dma_pad_mask;
1431 static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
1434 unsigned int alignment = blk_lim_dma_alignment_and_pad(&q->limits);
1436 return !(addr & alignment) && !(len & alignment);
1439 /* assumes size > 256 */
1440 static inline unsigned int blksize_bits(unsigned int size)
1442 return order_base_2(size >> SECTOR_SHIFT) + SECTOR_SHIFT;
1445 int kblockd_schedule_work(struct work_struct *work);
1446 int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
1448 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1449 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1450 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1451 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1453 #ifdef CONFIG_BLK_INLINE_ENCRYPTION
1455 bool blk_crypto_register(struct blk_crypto_profile *profile,
1456 struct request_queue *q);
1458 #else /* CONFIG_BLK_INLINE_ENCRYPTION */
1460 static inline bool blk_crypto_register(struct blk_crypto_profile *profile,
1461 struct request_queue *q)
1466 #endif /* CONFIG_BLK_INLINE_ENCRYPTION */
1468 enum blk_unique_id {
1469 /* these match the Designator Types specified in SPC */
1475 struct block_device_operations {
1476 void (*submit_bio)(struct bio *bio);
1477 int (*poll_bio)(struct bio *bio, struct io_comp_batch *iob,
1478 unsigned int flags);
1479 int (*open)(struct gendisk *disk, blk_mode_t mode);
1480 void (*release)(struct gendisk *disk);
1481 int (*ioctl)(struct block_device *bdev, blk_mode_t mode,
1482 unsigned cmd, unsigned long arg);
1483 int (*compat_ioctl)(struct block_device *bdev, blk_mode_t mode,
1484 unsigned cmd, unsigned long arg);
1485 unsigned int (*check_events) (struct gendisk *disk,
1486 unsigned int clearing);
1487 void (*unlock_native_capacity) (struct gendisk *);
1488 int (*getgeo)(struct block_device *, struct hd_geometry *);
1489 int (*set_read_only)(struct block_device *bdev, bool ro);
1490 void (*free_disk)(struct gendisk *disk);
1491 /* this callback is with swap_lock and sometimes page table lock held */
1492 void (*swap_slot_free_notify) (struct block_device *, unsigned long);
1493 int (*report_zones)(struct gendisk *, sector_t sector,
1494 unsigned int nr_zones, report_zones_cb cb, void *data);
1495 char *(*devnode)(struct gendisk *disk, umode_t *mode);
1496 /* returns the length of the identifier or a negative errno: */
1497 int (*get_unique_id)(struct gendisk *disk, u8 id[16],
1498 enum blk_unique_id id_type);
1499 struct module *owner;
1500 const struct pr_ops *pr_ops;
1503 * Special callback for probing GPT entry at a given sector.
1504 * Needed by Android devices, used by GPT scanner and MMC blk
1507 int (*alternative_gpt_sector)(struct gendisk *disk, sector_t *sector);
1510 #ifdef CONFIG_COMPAT
1511 extern int blkdev_compat_ptr_ioctl(struct block_device *, blk_mode_t,
1512 unsigned int, unsigned long);
1514 #define blkdev_compat_ptr_ioctl NULL
1517 static inline void blk_wake_io_task(struct task_struct *waiter)
1520 * If we're polling, the task itself is doing the completions. For
1521 * that case, we don't need to signal a wakeup, it's enough to just
1522 * mark us as RUNNING.
1524 if (waiter == current)
1525 __set_current_state(TASK_RUNNING);
1527 wake_up_process(waiter);
1530 unsigned long bdev_start_io_acct(struct block_device *bdev, enum req_op op,
1531 unsigned long start_time);
1532 void bdev_end_io_acct(struct block_device *bdev, enum req_op op,
1533 unsigned int sectors, unsigned long start_time);
1535 unsigned long bio_start_io_acct(struct bio *bio);
1536 void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time,
1537 struct block_device *orig_bdev);
1540 * bio_end_io_acct - end I/O accounting for bio based drivers
1541 * @bio: bio to end account for
1542 * @start_time: start time returned by bio_start_io_acct()
1544 static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time)
1546 return bio_end_io_acct_remapped(bio, start_time, bio->bi_bdev);
1549 int bdev_read_only(struct block_device *bdev);
1550 int set_blocksize(struct file *file, int size);
1552 int lookup_bdev(const char *pathname, dev_t *dev);
1554 void blkdev_show(struct seq_file *seqf, off_t offset);
1556 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1557 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
1559 #define BLKDEV_MAJOR_MAX 512
1561 #define BLKDEV_MAJOR_MAX 0
1564 struct blk_holder_ops {
1565 void (*mark_dead)(struct block_device *bdev, bool surprise);
1568 * Sync the file system mounted on the block device.
1570 void (*sync)(struct block_device *bdev);
1573 * Freeze the file system mounted on the block device.
1575 int (*freeze)(struct block_device *bdev);
1578 * Thaw the file system mounted on the block device.
1580 int (*thaw)(struct block_device *bdev);
1584 * For filesystems using @fs_holder_ops, the @holder argument passed to
1585 * helpers used to open and claim block devices via
1586 * bd_prepare_to_claim() must point to a superblock.
1588 extern const struct blk_holder_ops fs_holder_ops;
1591 * Return the correct open flags for blkdev_get_by_* for super block flags
1592 * as stored in sb->s_flags.
1594 #define sb_open_mode(flags) \
1595 (BLK_OPEN_READ | BLK_OPEN_RESTRICT_WRITES | \
1596 (((flags) & SB_RDONLY) ? 0 : BLK_OPEN_WRITE))
1598 struct file *bdev_file_open_by_dev(dev_t dev, blk_mode_t mode, void *holder,
1599 const struct blk_holder_ops *hops);
1600 struct file *bdev_file_open_by_path(const char *path, blk_mode_t mode,
1601 void *holder, const struct blk_holder_ops *hops);
1602 int bd_prepare_to_claim(struct block_device *bdev, void *holder,
1603 const struct blk_holder_ops *hops);
1604 void bd_abort_claiming(struct block_device *bdev, void *holder);
1606 /* just for blk-cgroup, don't use elsewhere */
1607 struct block_device *blkdev_get_no_open(dev_t dev);
1608 void blkdev_put_no_open(struct block_device *bdev);
1610 struct block_device *I_BDEV(struct inode *inode);
1611 struct block_device *file_bdev(struct file *bdev_file);
1612 bool disk_live(struct gendisk *disk);
1613 unsigned int block_size(struct block_device *bdev);
1616 void invalidate_bdev(struct block_device *bdev);
1617 int sync_blockdev(struct block_device *bdev);
1618 int sync_blockdev_range(struct block_device *bdev, loff_t lstart, loff_t lend);
1619 int sync_blockdev_nowait(struct block_device *bdev);
1620 void sync_bdevs(bool wait);
1621 void bdev_statx(struct path *, struct kstat *, u32);
1622 void printk_all_partitions(void);
1623 int __init early_lookup_bdev(const char *pathname, dev_t *dev);
1625 static inline void invalidate_bdev(struct block_device *bdev)
1628 static inline int sync_blockdev(struct block_device *bdev)
1632 static inline int sync_blockdev_nowait(struct block_device *bdev)
1636 static inline void sync_bdevs(bool wait)
1639 static inline void bdev_statx(struct path *path, struct kstat *stat,
1643 static inline void printk_all_partitions(void)
1646 static inline int early_lookup_bdev(const char *pathname, dev_t *dev)
1650 #endif /* CONFIG_BLOCK */
1652 int bdev_freeze(struct block_device *bdev);
1653 int bdev_thaw(struct block_device *bdev);
1654 void bdev_fput(struct file *bdev_file);
1656 struct io_comp_batch {
1657 struct request *req_list;
1659 void (*complete)(struct io_comp_batch *);
1662 static inline bool bdev_can_atomic_write(struct block_device *bdev)
1664 struct request_queue *bd_queue = bdev->bd_queue;
1665 struct queue_limits *limits = &bd_queue->limits;
1667 if (!limits->atomic_write_unit_min)
1670 if (bdev_is_partition(bdev)) {
1671 sector_t bd_start_sect = bdev->bd_start_sect;
1672 unsigned int alignment =
1673 max(limits->atomic_write_unit_min,
1674 limits->atomic_write_hw_boundary);
1676 if (!IS_ALIGNED(bd_start_sect, alignment >> SECTOR_SHIFT))
1683 #define DEFINE_IO_COMP_BATCH(name) struct io_comp_batch name = { }
1685 #endif /* _LINUX_BLKDEV_H */