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>
28 #include <linux/lockdep.h>
32 struct elevator_queue;
37 struct blk_flush_queue;
41 struct blk_queue_stats;
42 struct blk_stat_callback;
43 struct blk_crypto_profile;
45 extern const struct device_type disk_type;
46 extern const struct device_type part_type;
47 extern const struct class block_class;
50 * Maximum number of blkcg policies allowed to be registered concurrently.
51 * Defined here to simplify include dependency.
53 #define BLKCG_MAX_POLS 6
55 #define DISK_MAX_PARTS 256
56 #define DISK_NAME_LEN 32
58 #define PARTITION_META_INFO_VOLNAMELTH 64
60 * Enough for the string representation of any kind of UUID plus NULL.
61 * EFI UUID is 36 characters. MSDOS UUID is 11 characters.
63 #define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1)
65 struct partition_meta_info {
66 char uuid[PARTITION_META_INFO_UUIDLTH];
67 u8 volname[PARTITION_META_INFO_VOLNAMELTH];
71 * DOC: genhd capability flags
73 * ``GENHD_FL_REMOVABLE``: indicates that the block device gives access to
74 * removable media. When set, the device remains present even when media is not
75 * inserted. Shall not be set for devices which are removed entirely when the
78 * ``GENHD_FL_HIDDEN``: the block device is hidden; it doesn't produce events,
79 * doesn't appear in sysfs, and can't be opened from userspace or using
80 * blkdev_get*. Used for the underlying components of multipath devices.
82 * ``GENHD_FL_NO_PART``: partition support is disabled. The kernel will not
83 * scan for partitions from add_disk, and users can't add partitions manually.
87 GENHD_FL_REMOVABLE = 1 << 0,
88 GENHD_FL_HIDDEN = 1 << 1,
89 GENHD_FL_NO_PART = 1 << 2,
93 DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */
94 DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */
98 /* Poll even if events_poll_msecs is unset */
99 DISK_EVENT_FLAG_POLL = 1 << 0,
100 /* Forward events to udev */
101 DISK_EVENT_FLAG_UEVENT = 1 << 1,
102 /* Block event polling when open for exclusive write */
103 DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE = 1 << 2,
109 enum blk_integrity_checksum {
110 BLK_INTEGRITY_CSUM_NONE = 0,
111 BLK_INTEGRITY_CSUM_IP = 1,
112 BLK_INTEGRITY_CSUM_CRC = 2,
113 BLK_INTEGRITY_CSUM_CRC64 = 3,
116 struct blk_integrity {
118 enum blk_integrity_checksum csum_type;
119 unsigned char tuple_size;
120 unsigned char pi_offset;
121 unsigned char interval_exp;
122 unsigned char tag_size;
125 typedef unsigned int __bitwise blk_mode_t;
127 /* open for reading */
128 #define BLK_OPEN_READ ((__force blk_mode_t)(1 << 0))
129 /* open for writing */
130 #define BLK_OPEN_WRITE ((__force blk_mode_t)(1 << 1))
131 /* open exclusively (vs other exclusive openers */
132 #define BLK_OPEN_EXCL ((__force blk_mode_t)(1 << 2))
133 /* opened with O_NDELAY */
134 #define BLK_OPEN_NDELAY ((__force blk_mode_t)(1 << 3))
135 /* open for "writes" only for ioctls (specialy hack for floppy.c) */
136 #define BLK_OPEN_WRITE_IOCTL ((__force blk_mode_t)(1 << 4))
137 /* open is exclusive wrt all other BLK_OPEN_WRITE opens to the device */
138 #define BLK_OPEN_RESTRICT_WRITES ((__force blk_mode_t)(1 << 5))
139 /* return partition scanning errors */
140 #define BLK_OPEN_STRICT_SCAN ((__force blk_mode_t)(1 << 6))
144 * major/first_minor/minors should not be set by any new driver, the
145 * block core will take care of allocating them automatically.
151 char disk_name[DISK_NAME_LEN]; /* name of major driver */
153 unsigned short events; /* supported events */
154 unsigned short event_flags; /* flags related to event processing */
156 struct xarray part_tbl;
157 struct block_device *part0;
159 const struct block_device_operations *fops;
160 struct request_queue *queue;
163 struct bio_set bio_split;
167 #define GD_NEED_PART_SCAN 0
168 #define GD_READ_ONLY 1
170 #define GD_NATIVE_CAPACITY 3
172 #define GD_SUPPRESS_PART_SCAN 5
173 #define GD_OWNS_QUEUE 6
175 struct mutex open_mutex; /* open/close mutex */
176 unsigned open_partitions; /* number of open partitions */
178 struct backing_dev_info *bdi;
179 struct kobject queue_kobj; /* the queue/ directory */
180 struct kobject *slave_dir;
181 #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED
182 struct list_head slave_bdevs;
184 struct timer_rand_state *random;
185 atomic_t sync_io; /* RAID */
186 struct disk_events *ev;
188 #ifdef CONFIG_BLK_DEV_ZONED
190 * Zoned block device information. Reads of this information must be
191 * protected with blk_queue_enter() / blk_queue_exit(). Modifying this
192 * information is only allowed while no requests are being processed.
193 * See also blk_mq_freeze_queue() and blk_mq_unfreeze_queue().
195 unsigned int nr_zones;
196 unsigned int zone_capacity;
197 unsigned int last_zone_capacity;
198 unsigned long __rcu *conv_zones_bitmap;
199 unsigned int zone_wplugs_hash_bits;
200 spinlock_t zone_wplugs_lock;
201 struct mempool_s *zone_wplugs_pool;
202 struct hlist_head *zone_wplugs_hash;
203 struct list_head zone_wplugs_err_list;
204 struct work_struct zone_wplugs_work;
205 struct workqueue_struct *zone_wplugs_wq;
206 #endif /* CONFIG_BLK_DEV_ZONED */
208 #if IS_ENABLED(CONFIG_CDROM)
209 struct cdrom_device_info *cdi;
212 struct badblocks *bb;
213 struct lockdep_map lockdep_map;
215 blk_mode_t open_mode;
218 * Independent sector access ranges. This is always NULL for
219 * devices that do not have multiple independent access ranges.
221 struct blk_independent_access_ranges *ia_ranges;
225 * disk_openers - returns how many openers are there for a disk
226 * @disk: disk to check
228 * This returns the number of openers for a disk. Note that this value is only
229 * stable if disk->open_mutex is held.
231 * Note: Due to a quirk in the block layer open code, each open partition is
232 * only counted once even if there are multiple openers.
234 static inline unsigned int disk_openers(struct gendisk *disk)
236 return atomic_read(&disk->part0->bd_openers);
240 * disk_has_partscan - return %true if partition scanning is enabled on a disk
241 * @disk: disk to check
243 * Returns %true if partitions scanning is enabled for @disk, or %false if
244 * partition scanning is disabled either permanently or temporarily.
246 static inline bool disk_has_partscan(struct gendisk *disk)
248 return !(disk->flags & (GENHD_FL_NO_PART | GENHD_FL_HIDDEN)) &&
249 !test_bit(GD_SUPPRESS_PART_SCAN, &disk->state);
253 * The gendisk is refcounted by the part0 block_device, and the bd_device
254 * therein is also used for device model presentation in sysfs.
256 #define dev_to_disk(device) \
257 (dev_to_bdev(device)->bd_disk)
258 #define disk_to_dev(disk) \
259 (&((disk)->part0->bd_device))
261 #if IS_REACHABLE(CONFIG_CDROM)
262 #define disk_to_cdi(disk) ((disk)->cdi)
264 #define disk_to_cdi(disk) NULL
267 static inline dev_t disk_devt(struct gendisk *disk)
269 return MKDEV(disk->major, disk->first_minor);
272 /* blk_validate_limits() validates bsize, so drivers don't usually need to */
273 static inline int blk_validate_block_size(unsigned long bsize)
275 if (bsize < 512 || bsize > PAGE_SIZE || !is_power_of_2(bsize))
281 static inline bool blk_op_is_passthrough(blk_opf_t op)
284 return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT;
287 /* flags set by the driver in queue_limits.features */
288 typedef unsigned int __bitwise blk_features_t;
290 /* supports a volatile write cache */
291 #define BLK_FEAT_WRITE_CACHE ((__force blk_features_t)(1u << 0))
293 /* supports passing on the FUA bit */
294 #define BLK_FEAT_FUA ((__force blk_features_t)(1u << 1))
296 /* rotational device (hard drive or floppy) */
297 #define BLK_FEAT_ROTATIONAL ((__force blk_features_t)(1u << 2))
299 /* contributes to the random number pool */
300 #define BLK_FEAT_ADD_RANDOM ((__force blk_features_t)(1u << 3))
302 /* do disk/partitions IO accounting */
303 #define BLK_FEAT_IO_STAT ((__force blk_features_t)(1u << 4))
305 /* don't modify data until writeback is done */
306 #define BLK_FEAT_STABLE_WRITES ((__force blk_features_t)(1u << 5))
308 /* always completes in submit context */
309 #define BLK_FEAT_SYNCHRONOUS ((__force blk_features_t)(1u << 6))
311 /* supports REQ_NOWAIT */
312 #define BLK_FEAT_NOWAIT ((__force blk_features_t)(1u << 7))
315 #define BLK_FEAT_DAX ((__force blk_features_t)(1u << 8))
317 /* supports I/O polling */
318 #define BLK_FEAT_POLL ((__force blk_features_t)(1u << 9))
320 /* is a zoned device */
321 #define BLK_FEAT_ZONED ((__force blk_features_t)(1u << 10))
323 /* supports PCI(e) p2p requests */
324 #define BLK_FEAT_PCI_P2PDMA ((__force blk_features_t)(1u << 12))
326 /* skip this queue in blk_mq_(un)quiesce_tagset */
327 #define BLK_FEAT_SKIP_TAGSET_QUIESCE ((__force blk_features_t)(1u << 13))
329 /* bounce all highmem pages */
330 #define BLK_FEAT_BOUNCE_HIGH ((__force blk_features_t)(1u << 14))
332 /* undocumented magic for bcache */
333 #define BLK_FEAT_RAID_PARTIAL_STRIPES_EXPENSIVE \
334 ((__force blk_features_t)(1u << 15))
337 * Flags automatically inherited when stacking limits.
339 #define BLK_FEAT_INHERIT_MASK \
340 (BLK_FEAT_WRITE_CACHE | BLK_FEAT_FUA | BLK_FEAT_ROTATIONAL | \
341 BLK_FEAT_STABLE_WRITES | BLK_FEAT_ZONED | BLK_FEAT_BOUNCE_HIGH | \
342 BLK_FEAT_RAID_PARTIAL_STRIPES_EXPENSIVE)
344 /* internal flags in queue_limits.flags */
345 typedef unsigned int __bitwise blk_flags_t;
347 /* do not send FLUSH/FUA commands despite advertising a write cache */
348 #define BLK_FLAG_WRITE_CACHE_DISABLED ((__force blk_flags_t)(1u << 0))
350 /* I/O topology is misaligned */
351 #define BLK_FLAG_MISALIGNED ((__force blk_flags_t)(1u << 1))
353 /* passthrough command IO accounting */
354 #define BLK_FLAG_IOSTATS_PASSTHROUGH ((__force blk_flags_t)(1u << 2))
356 struct queue_limits {
357 blk_features_t features;
359 unsigned long seg_boundary_mask;
360 unsigned long virt_boundary_mask;
362 unsigned int max_hw_sectors;
363 unsigned int max_dev_sectors;
364 unsigned int chunk_sectors;
365 unsigned int max_sectors;
366 unsigned int max_user_sectors;
367 unsigned int max_segment_size;
368 unsigned int physical_block_size;
369 unsigned int logical_block_size;
370 unsigned int alignment_offset;
373 unsigned int max_discard_sectors;
374 unsigned int max_hw_discard_sectors;
375 unsigned int max_user_discard_sectors;
376 unsigned int max_secure_erase_sectors;
377 unsigned int max_write_zeroes_sectors;
378 unsigned int max_hw_zone_append_sectors;
379 unsigned int max_zone_append_sectors;
380 unsigned int discard_granularity;
381 unsigned int discard_alignment;
382 unsigned int zone_write_granularity;
384 /* atomic write limits */
385 unsigned int atomic_write_hw_max;
386 unsigned int atomic_write_max_sectors;
387 unsigned int atomic_write_hw_boundary;
388 unsigned int atomic_write_boundary_sectors;
389 unsigned int atomic_write_hw_unit_min;
390 unsigned int atomic_write_unit_min;
391 unsigned int atomic_write_hw_unit_max;
392 unsigned int atomic_write_unit_max;
394 unsigned short max_segments;
395 unsigned short max_integrity_segments;
396 unsigned short max_discard_segments;
398 unsigned int max_open_zones;
399 unsigned int max_active_zones;
402 * Drivers that set dma_alignment to less than 511 must be prepared to
403 * handle individual bvec's that are not a multiple of a SECTOR_SIZE
404 * due to possible offsets.
406 unsigned int dma_alignment;
407 unsigned int dma_pad_mask;
409 struct blk_integrity integrity;
412 typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx,
415 #define BLK_ALL_ZONES ((unsigned int)-1)
416 int blkdev_report_zones(struct block_device *bdev, sector_t sector,
417 unsigned int nr_zones, report_zones_cb cb, void *data);
418 int blkdev_zone_mgmt(struct block_device *bdev, enum req_op op,
419 sector_t sectors, sector_t nr_sectors);
420 int blk_revalidate_disk_zones(struct gendisk *disk);
423 * Independent access ranges: struct blk_independent_access_range describes
424 * a range of contiguous sectors that can be accessed using device command
425 * execution resources that are independent from the resources used for
426 * other access ranges. This is typically found with single-LUN multi-actuator
427 * HDDs where each access range is served by a different set of heads.
428 * The set of independent ranges supported by the device is defined using
429 * struct blk_independent_access_ranges. The independent ranges must not overlap
430 * and must include all sectors within the disk capacity (no sector holes
432 * For a device with multiple ranges, requests targeting sectors in different
433 * ranges can be executed in parallel. A request can straddle an access range
436 struct blk_independent_access_range {
442 struct blk_independent_access_ranges {
444 bool sysfs_registered;
445 unsigned int nr_ia_ranges;
446 struct blk_independent_access_range ia_range[];
449 struct request_queue {
451 * The queue owner gets to use this for whatever they like.
452 * ll_rw_blk doesn't touch it.
456 struct elevator_queue *elevator;
458 const struct blk_mq_ops *mq_ops;
461 struct blk_mq_ctx __percpu *queue_ctx;
464 * various queue flags, see QUEUE_* below
466 unsigned long queue_flags;
468 unsigned int rq_timeout;
470 unsigned int queue_depth;
474 /* hw dispatch queues */
475 unsigned int nr_hw_queues;
476 struct xarray hctx_table;
478 struct percpu_ref q_usage_counter;
479 struct lock_class_key io_lock_cls_key;
480 struct lockdep_map io_lockdep_map;
482 struct lock_class_key q_lock_cls_key;
483 struct lockdep_map q_lockdep_map;
485 struct request *last_merge;
487 spinlock_t queue_lock;
491 struct gendisk *disk;
496 struct kobject *mq_kobj;
498 struct queue_limits limits;
502 enum rpm_status rpm_status;
506 * Number of contexts that have called blk_set_pm_only(). If this
507 * counter is above zero then only RQF_PM requests are processed.
511 struct blk_queue_stats *stats;
512 struct rq_qos *rq_qos;
513 struct mutex rq_qos_mutex;
516 * ida allocated id for this queue. Used to index queues from
524 unsigned long nr_requests; /* Max # of requests */
526 #ifdef CONFIG_BLK_INLINE_ENCRYPTION
527 struct blk_crypto_profile *crypto_profile;
528 struct kobject *crypto_kobject;
531 struct timer_list timeout;
532 struct work_struct timeout_work;
534 atomic_t nr_active_requests_shared_tags;
536 struct blk_mq_tags *sched_shared_tags;
538 struct list_head icq_list;
539 #ifdef CONFIG_BLK_CGROUP
540 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
541 struct blkcg_gq *root_blkg;
542 struct list_head blkg_list;
543 struct mutex blkcg_mutex;
548 spinlock_t requeue_lock;
549 struct list_head requeue_list;
550 struct delayed_work requeue_work;
552 #ifdef CONFIG_BLK_DEV_IO_TRACE
553 struct blk_trace __rcu *blk_trace;
556 * for flush operations
558 struct blk_flush_queue *fq;
559 struct list_head flush_list;
561 struct mutex sysfs_lock;
562 struct mutex sysfs_dir_lock;
563 struct mutex limits_lock;
566 * for reusing dead hctx instance in case of updating
569 struct list_head unused_hctx_list;
570 spinlock_t unused_hctx_lock;
574 #ifdef CONFIG_BLK_DEV_THROTTLING
576 struct throtl_data *td;
578 struct rcu_head rcu_head;
579 #ifdef CONFIG_LOCKDEP
580 struct task_struct *mq_freeze_owner;
581 int mq_freeze_owner_depth;
583 wait_queue_head_t mq_freeze_wq;
585 * Protect concurrent access to q_usage_counter by
586 * percpu_ref_kill() and percpu_ref_reinit().
588 struct mutex mq_freeze_lock;
590 struct blk_mq_tag_set *tag_set;
591 struct list_head tag_set_list;
593 struct dentry *debugfs_dir;
594 struct dentry *sched_debugfs_dir;
595 struct dentry *rqos_debugfs_dir;
597 * Serializes all debugfs metadata operations using the above dentries.
599 struct mutex debugfs_mutex;
601 bool mq_sysfs_init_done;
604 /* Keep blk_queue_flag_name[] in sync with the definitions below */
606 QUEUE_FLAG_DYING, /* queue being torn down */
607 QUEUE_FLAG_NOMERGES, /* disable merge attempts */
608 QUEUE_FLAG_SAME_COMP, /* complete on same CPU-group */
609 QUEUE_FLAG_FAIL_IO, /* fake timeout */
610 QUEUE_FLAG_NOXMERGES, /* No extended merges */
611 QUEUE_FLAG_SAME_FORCE, /* force complete on same CPU */
612 QUEUE_FLAG_INIT_DONE, /* queue is initialized */
613 QUEUE_FLAG_STATS, /* track IO start and completion times */
614 QUEUE_FLAG_REGISTERED, /* queue has been registered to a disk */
615 QUEUE_FLAG_QUIESCED, /* queue has been quiesced */
616 QUEUE_FLAG_RQ_ALLOC_TIME, /* record rq->alloc_time_ns */
617 QUEUE_FLAG_HCTX_ACTIVE, /* at least one blk-mq hctx is active */
618 QUEUE_FLAG_SQ_SCHED, /* single queue style io dispatch */
622 #define QUEUE_FLAG_MQ_DEFAULT (1UL << QUEUE_FLAG_SAME_COMP)
624 void blk_queue_flag_set(unsigned int flag, struct request_queue *q);
625 void blk_queue_flag_clear(unsigned int flag, struct request_queue *q);
627 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
628 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
629 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
630 #define blk_queue_noxmerges(q) \
631 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
632 #define blk_queue_nonrot(q) (!((q)->limits.features & BLK_FEAT_ROTATIONAL))
633 #define blk_queue_io_stat(q) ((q)->limits.features & BLK_FEAT_IO_STAT)
634 #define blk_queue_passthrough_stat(q) \
635 ((q)->limits.flags & BLK_FLAG_IOSTATS_PASSTHROUGH)
636 #define blk_queue_dax(q) ((q)->limits.features & BLK_FEAT_DAX)
637 #define blk_queue_pci_p2pdma(q) ((q)->limits.features & BLK_FEAT_PCI_P2PDMA)
638 #ifdef CONFIG_BLK_RQ_ALLOC_TIME
639 #define blk_queue_rq_alloc_time(q) \
640 test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags)
642 #define blk_queue_rq_alloc_time(q) false
645 #define blk_noretry_request(rq) \
646 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
647 REQ_FAILFAST_DRIVER))
648 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
649 #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only)
650 #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags)
651 #define blk_queue_sq_sched(q) test_bit(QUEUE_FLAG_SQ_SCHED, &(q)->queue_flags)
652 #define blk_queue_skip_tagset_quiesce(q) \
653 ((q)->limits.features & BLK_FEAT_SKIP_TAGSET_QUIESCE)
655 extern void blk_set_pm_only(struct request_queue *q);
656 extern void blk_clear_pm_only(struct request_queue *q);
658 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
660 #define dma_map_bvec(dev, bv, dir, attrs) \
661 dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \
664 static inline bool queue_is_mq(struct request_queue *q)
670 static inline enum rpm_status queue_rpm_status(struct request_queue *q)
672 return q->rpm_status;
675 static inline enum rpm_status queue_rpm_status(struct request_queue *q)
681 static inline bool blk_queue_is_zoned(struct request_queue *q)
683 return IS_ENABLED(CONFIG_BLK_DEV_ZONED) &&
684 (q->limits.features & BLK_FEAT_ZONED);
687 #ifdef CONFIG_BLK_DEV_ZONED
688 static inline unsigned int disk_nr_zones(struct gendisk *disk)
690 return disk->nr_zones;
692 bool blk_zone_plug_bio(struct bio *bio, unsigned int nr_segs);
693 #else /* CONFIG_BLK_DEV_ZONED */
694 static inline unsigned int disk_nr_zones(struct gendisk *disk)
698 static inline bool blk_zone_plug_bio(struct bio *bio, unsigned int nr_segs)
702 #endif /* CONFIG_BLK_DEV_ZONED */
704 static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector)
706 if (!blk_queue_is_zoned(disk->queue))
708 return sector >> ilog2(disk->queue->limits.chunk_sectors);
711 static inline unsigned int bdev_nr_zones(struct block_device *bdev)
713 return disk_nr_zones(bdev->bd_disk);
716 static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
718 return bdev->bd_disk->queue->limits.max_open_zones;
721 static inline unsigned int bdev_max_active_zones(struct block_device *bdev)
723 return bdev->bd_disk->queue->limits.max_active_zones;
726 static inline unsigned int blk_queue_depth(struct request_queue *q)
729 return q->queue_depth;
731 return q->nr_requests;
735 * default timeout for SG_IO if none specified
737 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
738 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
740 /* This should not be used directly - use rq_for_each_segment */
741 #define for_each_bio(_bio) \
742 for (; _bio; _bio = _bio->bi_next)
744 int __must_check add_disk_fwnode(struct device *parent, struct gendisk *disk,
745 const struct attribute_group **groups,
746 struct fwnode_handle *fwnode);
747 int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
748 const struct attribute_group **groups);
749 static inline int __must_check add_disk(struct gendisk *disk)
751 return device_add_disk(NULL, disk, NULL);
753 void del_gendisk(struct gendisk *gp);
754 void invalidate_disk(struct gendisk *disk);
755 void set_disk_ro(struct gendisk *disk, bool read_only);
756 void disk_uevent(struct gendisk *disk, enum kobject_action action);
758 static inline u8 bdev_partno(const struct block_device *bdev)
760 return atomic_read(&bdev->__bd_flags) & BD_PARTNO;
763 static inline bool bdev_test_flag(const struct block_device *bdev, unsigned flag)
765 return atomic_read(&bdev->__bd_flags) & flag;
768 static inline void bdev_set_flag(struct block_device *bdev, unsigned flag)
770 atomic_or(flag, &bdev->__bd_flags);
773 static inline void bdev_clear_flag(struct block_device *bdev, unsigned flag)
775 atomic_andnot(flag, &bdev->__bd_flags);
778 static inline int get_disk_ro(struct gendisk *disk)
780 return bdev_test_flag(disk->part0, BD_READ_ONLY) ||
781 test_bit(GD_READ_ONLY, &disk->state);
784 static inline int bdev_read_only(struct block_device *bdev)
786 return bdev_test_flag(bdev, BD_READ_ONLY) || get_disk_ro(bdev->bd_disk);
789 bool set_capacity_and_notify(struct gendisk *disk, sector_t size);
790 void disk_force_media_change(struct gendisk *disk);
791 void bdev_mark_dead(struct block_device *bdev, bool surprise);
793 void add_disk_randomness(struct gendisk *disk) __latent_entropy;
794 void rand_initialize_disk(struct gendisk *disk);
796 static inline sector_t get_start_sect(struct block_device *bdev)
798 return bdev->bd_start_sect;
801 static inline sector_t bdev_nr_sectors(struct block_device *bdev)
803 return bdev->bd_nr_sectors;
806 static inline loff_t bdev_nr_bytes(struct block_device *bdev)
808 return (loff_t)bdev_nr_sectors(bdev) << SECTOR_SHIFT;
811 static inline sector_t get_capacity(struct gendisk *disk)
813 return bdev_nr_sectors(disk->part0);
816 static inline u64 sb_bdev_nr_blocks(struct super_block *sb)
818 return bdev_nr_sectors(sb->s_bdev) >>
819 (sb->s_blocksize_bits - SECTOR_SHIFT);
822 int bdev_disk_changed(struct gendisk *disk, bool invalidate);
824 void put_disk(struct gendisk *disk);
825 struct gendisk *__blk_alloc_disk(struct queue_limits *lim, int node,
826 struct lock_class_key *lkclass);
829 * blk_alloc_disk - allocate a gendisk structure
830 * @lim: queue limits to be used for this disk.
831 * @node_id: numa node to allocate on
833 * Allocate and pre-initialize a gendisk structure for use with BIO based
836 * Returns an ERR_PTR on error, else the allocated disk.
840 #define blk_alloc_disk(lim, node_id) \
842 static struct lock_class_key __key; \
844 __blk_alloc_disk(lim, node_id, &__key); \
847 int __register_blkdev(unsigned int major, const char *name,
848 void (*probe)(dev_t devt));
849 #define register_blkdev(major, name) \
850 __register_blkdev(major, name, NULL)
851 void unregister_blkdev(unsigned int major, const char *name);
853 bool disk_check_media_change(struct gendisk *disk);
854 void set_capacity(struct gendisk *disk, sector_t size);
856 #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED
857 int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
858 void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk);
860 static inline int bd_link_disk_holder(struct block_device *bdev,
861 struct gendisk *disk)
865 static inline void bd_unlink_disk_holder(struct block_device *bdev,
866 struct gendisk *disk)
869 #endif /* CONFIG_BLOCK_HOLDER_DEPRECATED */
871 dev_t part_devt(struct gendisk *disk, u8 partno);
872 void inc_diskseq(struct gendisk *disk);
873 void blk_request_module(dev_t devt);
875 extern int blk_register_queue(struct gendisk *disk);
876 extern void blk_unregister_queue(struct gendisk *disk);
877 void submit_bio_noacct(struct bio *bio);
878 struct bio *bio_split_to_limits(struct bio *bio);
880 extern int blk_lld_busy(struct request_queue *q);
881 extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags);
882 extern void blk_queue_exit(struct request_queue *q);
883 extern void blk_sync_queue(struct request_queue *q);
885 /* Helper to convert REQ_OP_XXX to its string format XXX */
886 extern const char *blk_op_str(enum req_op op);
888 int blk_status_to_errno(blk_status_t status);
889 blk_status_t errno_to_blk_status(int errno);
890 const char *blk_status_to_str(blk_status_t status);
892 /* only poll the hardware once, don't continue until a completion was found */
893 #define BLK_POLL_ONESHOT (1 << 0)
894 int bio_poll(struct bio *bio, struct io_comp_batch *iob, unsigned int flags);
895 int iocb_bio_iopoll(struct kiocb *kiocb, struct io_comp_batch *iob,
898 static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
900 return bdev->bd_queue; /* this is never NULL */
903 /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */
904 const char *blk_zone_cond_str(enum blk_zone_cond zone_cond);
906 static inline unsigned int bio_zone_no(struct bio *bio)
908 return disk_zone_no(bio->bi_bdev->bd_disk, bio->bi_iter.bi_sector);
911 static inline bool bio_straddles_zones(struct bio *bio)
913 return bio_sectors(bio) &&
915 disk_zone_no(bio->bi_bdev->bd_disk, bio_end_sector(bio) - 1);
919 * Return how much within the boundary is left to be used for I/O at a given
922 static inline unsigned int blk_boundary_sectors_left(sector_t offset,
923 unsigned int boundary_sectors)
925 if (unlikely(!is_power_of_2(boundary_sectors)))
926 return boundary_sectors - sector_div(offset, boundary_sectors);
927 return boundary_sectors - (offset & (boundary_sectors - 1));
931 * queue_limits_start_update - start an atomic update of queue limits
932 * @q: queue to update
934 * This functions starts an atomic update of the queue limits. It takes a lock
935 * to prevent other updates and returns a snapshot of the current limits that
936 * the caller can modify. The caller must call queue_limits_commit_update()
937 * to finish the update.
939 * Context: process context. The caller must have frozen the queue or ensured
940 * that there is outstanding I/O by other means.
942 static inline struct queue_limits
943 queue_limits_start_update(struct request_queue *q)
945 mutex_lock(&q->limits_lock);
948 int queue_limits_commit_update(struct request_queue *q,
949 struct queue_limits *lim);
950 int queue_limits_set(struct request_queue *q, struct queue_limits *lim);
951 int blk_validate_limits(struct queue_limits *lim);
954 * queue_limits_cancel_update - cancel an atomic update of queue limits
955 * @q: queue to update
957 * This functions cancels an atomic update of the queue limits started by
958 * queue_limits_start_update() and should be used when an error occurs after
961 static inline void queue_limits_cancel_update(struct request_queue *q)
963 mutex_unlock(&q->limits_lock);
967 * These helpers are for drivers that have sloppy feature negotiation and might
968 * have to disable DISCARD, WRITE_ZEROES or SECURE_DISCARD from the I/O
969 * completion handler when the device returned an indicator that the respective
970 * feature is not actually supported. They are racy and the driver needs to
971 * cope with that. Try to avoid this scheme if you can.
973 static inline void blk_queue_disable_discard(struct request_queue *q)
975 q->limits.max_discard_sectors = 0;
978 static inline void blk_queue_disable_secure_erase(struct request_queue *q)
980 q->limits.max_secure_erase_sectors = 0;
983 static inline void blk_queue_disable_write_zeroes(struct request_queue *q)
985 q->limits.max_write_zeroes_sectors = 0;
989 * Access functions for manipulating queue properties
991 extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
992 extern void blk_set_stacking_limits(struct queue_limits *lim);
993 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
995 void queue_limits_stack_bdev(struct queue_limits *t, struct block_device *bdev,
996 sector_t offset, const char *pfx);
997 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
999 struct blk_independent_access_ranges *
1000 disk_alloc_independent_access_ranges(struct gendisk *disk, int nr_ia_ranges);
1001 void disk_set_independent_access_ranges(struct gendisk *disk,
1002 struct blk_independent_access_ranges *iars);
1004 bool __must_check blk_get_queue(struct request_queue *);
1005 extern void blk_put_queue(struct request_queue *);
1007 void blk_mark_disk_dead(struct gendisk *disk);
1010 struct request *head;
1011 struct request *tail;
1016 * blk_plug permits building a queue of related requests by holding the I/O
1017 * fragments for a short period. This allows merging of sequential requests
1018 * into single larger request. As the requests are moved from a per-task list to
1019 * the device's request_queue in a batch, this results in improved scalability
1020 * as the lock contention for request_queue lock is reduced.
1022 * It is ok not to disable preemption when adding the request to the plug list
1023 * or when attempting a merge. For details, please see schedule() where
1024 * blk_flush_plug() is called.
1027 struct rq_list mq_list; /* blk-mq requests */
1029 /* if ios_left is > 1, we can batch tag/rq allocations */
1030 struct rq_list cached_rqs;
1032 unsigned short nr_ios;
1034 unsigned short rq_count;
1036 bool multiple_queues;
1039 struct list_head cb_list; /* md requires an unplug callback */
1043 typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
1044 struct blk_plug_cb {
1045 struct list_head list;
1046 blk_plug_cb_fn callback;
1049 extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
1050 void *data, int size);
1051 extern void blk_start_plug(struct blk_plug *);
1052 extern void blk_start_plug_nr_ios(struct blk_plug *, unsigned short);
1053 extern void blk_finish_plug(struct blk_plug *);
1055 void __blk_flush_plug(struct blk_plug *plug, bool from_schedule);
1056 static inline void blk_flush_plug(struct blk_plug *plug, bool async)
1059 __blk_flush_plug(plug, async);
1063 * tsk == current here
1065 static inline void blk_plug_invalidate_ts(struct task_struct *tsk)
1067 struct blk_plug *plug = tsk->plug;
1070 plug->cur_ktime = 0;
1071 current->flags &= ~PF_BLOCK_TS;
1074 int blkdev_issue_flush(struct block_device *bdev);
1075 long nr_blockdev_pages(void);
1076 #else /* CONFIG_BLOCK */
1080 static inline void blk_start_plug_nr_ios(struct blk_plug *plug,
1081 unsigned short nr_ios)
1085 static inline void blk_start_plug(struct blk_plug *plug)
1089 static inline void blk_finish_plug(struct blk_plug *plug)
1093 static inline void blk_flush_plug(struct blk_plug *plug, bool async)
1097 static inline void blk_plug_invalidate_ts(struct task_struct *tsk)
1101 static inline int blkdev_issue_flush(struct block_device *bdev)
1106 static inline long nr_blockdev_pages(void)
1110 #endif /* CONFIG_BLOCK */
1112 extern void blk_io_schedule(void);
1114 int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1115 sector_t nr_sects, gfp_t gfp_mask);
1116 int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1117 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop);
1118 int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector,
1119 sector_t nr_sects, gfp_t gfp);
1121 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
1122 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
1123 #define BLKDEV_ZERO_KILLABLE (1 << 2) /* interruptible by fatal signals */
1125 extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1126 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
1128 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1129 sector_t nr_sects, gfp_t gfp_mask, unsigned flags);
1131 static inline int sb_issue_discard(struct super_block *sb, sector_t block,
1132 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
1134 return blkdev_issue_discard(sb->s_bdev,
1135 block << (sb->s_blocksize_bits -
1137 nr_blocks << (sb->s_blocksize_bits -
1141 static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
1142 sector_t nr_blocks, gfp_t gfp_mask)
1144 return blkdev_issue_zeroout(sb->s_bdev,
1145 block << (sb->s_blocksize_bits -
1147 nr_blocks << (sb->s_blocksize_bits -
1152 static inline bool bdev_is_partition(struct block_device *bdev)
1154 return bdev_partno(bdev) != 0;
1157 enum blk_default_limits {
1158 BLK_MAX_SEGMENTS = 128,
1159 BLK_SAFE_MAX_SECTORS = 255,
1160 BLK_MAX_SEGMENT_SIZE = 65536,
1161 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
1165 * Default upper limit for the software max_sectors limit used for
1166 * regular file system I/O. This can be increased through sysfs.
1168 * Not to be confused with the max_hw_sector limit that is entirely
1169 * controlled by the driver, usually based on hardware limits.
1171 #define BLK_DEF_MAX_SECTORS_CAP 2560u
1173 static inline struct queue_limits *bdev_limits(struct block_device *bdev)
1175 return &bdev_get_queue(bdev)->limits;
1178 static inline unsigned long queue_segment_boundary(const struct request_queue *q)
1180 return q->limits.seg_boundary_mask;
1183 static inline unsigned long queue_virt_boundary(const struct request_queue *q)
1185 return q->limits.virt_boundary_mask;
1188 static inline unsigned int queue_max_sectors(const struct request_queue *q)
1190 return q->limits.max_sectors;
1193 static inline unsigned int queue_max_bytes(struct request_queue *q)
1195 return min_t(unsigned int, queue_max_sectors(q), INT_MAX >> 9) << 9;
1198 static inline unsigned int queue_max_hw_sectors(const struct request_queue *q)
1200 return q->limits.max_hw_sectors;
1203 static inline unsigned short queue_max_segments(const struct request_queue *q)
1205 return q->limits.max_segments;
1208 static inline unsigned short queue_max_discard_segments(const struct request_queue *q)
1210 return q->limits.max_discard_segments;
1213 static inline unsigned int queue_max_segment_size(const struct request_queue *q)
1215 return q->limits.max_segment_size;
1218 static inline bool queue_emulates_zone_append(struct request_queue *q)
1220 return blk_queue_is_zoned(q) && !q->limits.max_hw_zone_append_sectors;
1223 static inline bool bdev_emulates_zone_append(struct block_device *bdev)
1225 return queue_emulates_zone_append(bdev_get_queue(bdev));
1228 static inline unsigned int
1229 bdev_max_zone_append_sectors(struct block_device *bdev)
1231 return bdev_limits(bdev)->max_zone_append_sectors;
1234 static inline unsigned int bdev_max_segments(struct block_device *bdev)
1236 return queue_max_segments(bdev_get_queue(bdev));
1239 static inline unsigned queue_logical_block_size(const struct request_queue *q)
1241 return q->limits.logical_block_size;
1244 static inline unsigned int bdev_logical_block_size(struct block_device *bdev)
1246 return queue_logical_block_size(bdev_get_queue(bdev));
1249 static inline unsigned int queue_physical_block_size(const struct request_queue *q)
1251 return q->limits.physical_block_size;
1254 static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
1256 return queue_physical_block_size(bdev_get_queue(bdev));
1259 static inline unsigned int queue_io_min(const struct request_queue *q)
1261 return q->limits.io_min;
1264 static inline int bdev_io_min(struct block_device *bdev)
1266 return queue_io_min(bdev_get_queue(bdev));
1269 static inline unsigned int queue_io_opt(const struct request_queue *q)
1271 return q->limits.io_opt;
1274 static inline int bdev_io_opt(struct block_device *bdev)
1276 return queue_io_opt(bdev_get_queue(bdev));
1279 static inline unsigned int
1280 queue_zone_write_granularity(const struct request_queue *q)
1282 return q->limits.zone_write_granularity;
1285 static inline unsigned int
1286 bdev_zone_write_granularity(struct block_device *bdev)
1288 return queue_zone_write_granularity(bdev_get_queue(bdev));
1291 int bdev_alignment_offset(struct block_device *bdev);
1292 unsigned int bdev_discard_alignment(struct block_device *bdev);
1294 static inline unsigned int bdev_max_discard_sectors(struct block_device *bdev)
1296 return bdev_limits(bdev)->max_discard_sectors;
1299 static inline unsigned int bdev_discard_granularity(struct block_device *bdev)
1301 return bdev_limits(bdev)->discard_granularity;
1304 static inline unsigned int
1305 bdev_max_secure_erase_sectors(struct block_device *bdev)
1307 return bdev_limits(bdev)->max_secure_erase_sectors;
1310 static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
1312 return bdev_limits(bdev)->max_write_zeroes_sectors;
1315 static inline bool bdev_nonrot(struct block_device *bdev)
1317 return blk_queue_nonrot(bdev_get_queue(bdev));
1320 static inline bool bdev_synchronous(struct block_device *bdev)
1322 return bdev->bd_disk->queue->limits.features & BLK_FEAT_SYNCHRONOUS;
1325 static inline bool bdev_stable_writes(struct block_device *bdev)
1327 struct request_queue *q = bdev_get_queue(bdev);
1329 if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY) &&
1330 q->limits.integrity.csum_type != BLK_INTEGRITY_CSUM_NONE)
1332 return q->limits.features & BLK_FEAT_STABLE_WRITES;
1335 static inline bool blk_queue_write_cache(struct request_queue *q)
1337 return (q->limits.features & BLK_FEAT_WRITE_CACHE) &&
1338 !(q->limits.flags & BLK_FLAG_WRITE_CACHE_DISABLED);
1341 static inline bool bdev_write_cache(struct block_device *bdev)
1343 return blk_queue_write_cache(bdev_get_queue(bdev));
1346 static inline bool bdev_fua(struct block_device *bdev)
1348 return bdev_limits(bdev)->features & BLK_FEAT_FUA;
1351 static inline bool bdev_nowait(struct block_device *bdev)
1353 return bdev->bd_disk->queue->limits.features & BLK_FEAT_NOWAIT;
1356 static inline bool bdev_is_zoned(struct block_device *bdev)
1358 return blk_queue_is_zoned(bdev_get_queue(bdev));
1361 static inline unsigned int bdev_zone_no(struct block_device *bdev, sector_t sec)
1363 return disk_zone_no(bdev->bd_disk, sec);
1366 static inline sector_t bdev_zone_sectors(struct block_device *bdev)
1368 struct request_queue *q = bdev_get_queue(bdev);
1370 if (!blk_queue_is_zoned(q))
1372 return q->limits.chunk_sectors;
1375 static inline sector_t bdev_offset_from_zone_start(struct block_device *bdev,
1378 return sector & (bdev_zone_sectors(bdev) - 1);
1381 static inline sector_t bio_offset_from_zone_start(struct bio *bio)
1383 return bdev_offset_from_zone_start(bio->bi_bdev,
1384 bio->bi_iter.bi_sector);
1387 static inline bool bdev_is_zone_start(struct block_device *bdev,
1390 return bdev_offset_from_zone_start(bdev, sector) == 0;
1394 * bdev_zone_is_seq - check if a sector belongs to a sequential write zone
1395 * @bdev: block device to check
1396 * @sector: sector number
1398 * Check if @sector on @bdev is contained in a sequential write required zone.
1400 static inline bool bdev_zone_is_seq(struct block_device *bdev, sector_t sector)
1402 bool is_seq = false;
1404 #if IS_ENABLED(CONFIG_BLK_DEV_ZONED)
1405 if (bdev_is_zoned(bdev)) {
1406 struct gendisk *disk = bdev->bd_disk;
1407 unsigned long *bitmap;
1410 bitmap = rcu_dereference(disk->conv_zones_bitmap);
1412 !test_bit(disk_zone_no(disk, sector), bitmap);
1420 static inline int queue_dma_alignment(const struct request_queue *q)
1422 return q->limits.dma_alignment;
1425 static inline unsigned int
1426 queue_atomic_write_unit_max_bytes(const struct request_queue *q)
1428 return q->limits.atomic_write_unit_max;
1431 static inline unsigned int
1432 queue_atomic_write_unit_min_bytes(const struct request_queue *q)
1434 return q->limits.atomic_write_unit_min;
1437 static inline unsigned int
1438 queue_atomic_write_boundary_bytes(const struct request_queue *q)
1440 return q->limits.atomic_write_boundary_sectors << SECTOR_SHIFT;
1443 static inline unsigned int
1444 queue_atomic_write_max_bytes(const struct request_queue *q)
1446 return q->limits.atomic_write_max_sectors << SECTOR_SHIFT;
1449 static inline unsigned int bdev_dma_alignment(struct block_device *bdev)
1451 return queue_dma_alignment(bdev_get_queue(bdev));
1454 static inline bool bdev_iter_is_aligned(struct block_device *bdev,
1455 struct iov_iter *iter)
1457 return iov_iter_is_aligned(iter, bdev_dma_alignment(bdev),
1458 bdev_logical_block_size(bdev) - 1);
1461 static inline int blk_lim_dma_alignment_and_pad(struct queue_limits *lim)
1463 return lim->dma_alignment | lim->dma_pad_mask;
1466 static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
1469 unsigned int alignment = blk_lim_dma_alignment_and_pad(&q->limits);
1471 return !(addr & alignment) && !(len & alignment);
1474 /* assumes size > 256 */
1475 static inline unsigned int blksize_bits(unsigned int size)
1477 return order_base_2(size >> SECTOR_SHIFT) + SECTOR_SHIFT;
1480 int kblockd_schedule_work(struct work_struct *work);
1481 int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
1483 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1484 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1485 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1486 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1488 #ifdef CONFIG_BLK_INLINE_ENCRYPTION
1490 bool blk_crypto_register(struct blk_crypto_profile *profile,
1491 struct request_queue *q);
1493 #else /* CONFIG_BLK_INLINE_ENCRYPTION */
1495 static inline bool blk_crypto_register(struct blk_crypto_profile *profile,
1496 struct request_queue *q)
1501 #endif /* CONFIG_BLK_INLINE_ENCRYPTION */
1503 enum blk_unique_id {
1504 /* these match the Designator Types specified in SPC */
1510 struct block_device_operations {
1511 void (*submit_bio)(struct bio *bio);
1512 int (*poll_bio)(struct bio *bio, struct io_comp_batch *iob,
1513 unsigned int flags);
1514 int (*open)(struct gendisk *disk, blk_mode_t mode);
1515 void (*release)(struct gendisk *disk);
1516 int (*ioctl)(struct block_device *bdev, blk_mode_t mode,
1517 unsigned cmd, unsigned long arg);
1518 int (*compat_ioctl)(struct block_device *bdev, blk_mode_t mode,
1519 unsigned cmd, unsigned long arg);
1520 unsigned int (*check_events) (struct gendisk *disk,
1521 unsigned int clearing);
1522 void (*unlock_native_capacity) (struct gendisk *);
1523 int (*getgeo)(struct block_device *, struct hd_geometry *);
1524 int (*set_read_only)(struct block_device *bdev, bool ro);
1525 void (*free_disk)(struct gendisk *disk);
1526 /* this callback is with swap_lock and sometimes page table lock held */
1527 void (*swap_slot_free_notify) (struct block_device *, unsigned long);
1528 int (*report_zones)(struct gendisk *, sector_t sector,
1529 unsigned int nr_zones, report_zones_cb cb, void *data);
1530 char *(*devnode)(struct gendisk *disk, umode_t *mode);
1531 /* returns the length of the identifier or a negative errno: */
1532 int (*get_unique_id)(struct gendisk *disk, u8 id[16],
1533 enum blk_unique_id id_type);
1534 struct module *owner;
1535 const struct pr_ops *pr_ops;
1538 * Special callback for probing GPT entry at a given sector.
1539 * Needed by Android devices, used by GPT scanner and MMC blk
1542 int (*alternative_gpt_sector)(struct gendisk *disk, sector_t *sector);
1545 #ifdef CONFIG_COMPAT
1546 extern int blkdev_compat_ptr_ioctl(struct block_device *, blk_mode_t,
1547 unsigned int, unsigned long);
1549 #define blkdev_compat_ptr_ioctl NULL
1552 static inline void blk_wake_io_task(struct task_struct *waiter)
1555 * If we're polling, the task itself is doing the completions. For
1556 * that case, we don't need to signal a wakeup, it's enough to just
1557 * mark us as RUNNING.
1559 if (waiter == current)
1560 __set_current_state(TASK_RUNNING);
1562 wake_up_process(waiter);
1565 unsigned long bdev_start_io_acct(struct block_device *bdev, enum req_op op,
1566 unsigned long start_time);
1567 void bdev_end_io_acct(struct block_device *bdev, enum req_op op,
1568 unsigned int sectors, unsigned long start_time);
1570 unsigned long bio_start_io_acct(struct bio *bio);
1571 void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time,
1572 struct block_device *orig_bdev);
1575 * bio_end_io_acct - end I/O accounting for bio based drivers
1576 * @bio: bio to end account for
1577 * @start_time: start time returned by bio_start_io_acct()
1579 static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time)
1581 return bio_end_io_acct_remapped(bio, start_time, bio->bi_bdev);
1584 int bdev_read_only(struct block_device *bdev);
1585 int set_blocksize(struct file *file, int size);
1587 int lookup_bdev(const char *pathname, dev_t *dev);
1589 void blkdev_show(struct seq_file *seqf, off_t offset);
1591 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1592 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
1594 #define BLKDEV_MAJOR_MAX 512
1596 #define BLKDEV_MAJOR_MAX 0
1599 struct blk_holder_ops {
1600 void (*mark_dead)(struct block_device *bdev, bool surprise);
1603 * Sync the file system mounted on the block device.
1605 void (*sync)(struct block_device *bdev);
1608 * Freeze the file system mounted on the block device.
1610 int (*freeze)(struct block_device *bdev);
1613 * Thaw the file system mounted on the block device.
1615 int (*thaw)(struct block_device *bdev);
1619 * For filesystems using @fs_holder_ops, the @holder argument passed to
1620 * helpers used to open and claim block devices via
1621 * bd_prepare_to_claim() must point to a superblock.
1623 extern const struct blk_holder_ops fs_holder_ops;
1626 * Return the correct open flags for blkdev_get_by_* for super block flags
1627 * as stored in sb->s_flags.
1629 #define sb_open_mode(flags) \
1630 (BLK_OPEN_READ | BLK_OPEN_RESTRICT_WRITES | \
1631 (((flags) & SB_RDONLY) ? 0 : BLK_OPEN_WRITE))
1633 struct file *bdev_file_open_by_dev(dev_t dev, blk_mode_t mode, void *holder,
1634 const struct blk_holder_ops *hops);
1635 struct file *bdev_file_open_by_path(const char *path, blk_mode_t mode,
1636 void *holder, const struct blk_holder_ops *hops);
1637 int bd_prepare_to_claim(struct block_device *bdev, void *holder,
1638 const struct blk_holder_ops *hops);
1639 void bd_abort_claiming(struct block_device *bdev, void *holder);
1641 /* just for blk-cgroup, don't use elsewhere */
1642 struct block_device *blkdev_get_no_open(dev_t dev);
1643 void blkdev_put_no_open(struct block_device *bdev);
1645 struct block_device *I_BDEV(struct inode *inode);
1646 struct block_device *file_bdev(struct file *bdev_file);
1647 bool disk_live(struct gendisk *disk);
1648 unsigned int block_size(struct block_device *bdev);
1651 void invalidate_bdev(struct block_device *bdev);
1652 int sync_blockdev(struct block_device *bdev);
1653 int sync_blockdev_range(struct block_device *bdev, loff_t lstart, loff_t lend);
1654 int sync_blockdev_nowait(struct block_device *bdev);
1655 void sync_bdevs(bool wait);
1656 void bdev_statx(struct path *, struct kstat *, u32);
1657 void printk_all_partitions(void);
1658 int __init early_lookup_bdev(const char *pathname, dev_t *dev);
1660 static inline void invalidate_bdev(struct block_device *bdev)
1663 static inline int sync_blockdev(struct block_device *bdev)
1667 static inline int sync_blockdev_nowait(struct block_device *bdev)
1671 static inline void sync_bdevs(bool wait)
1674 static inline void bdev_statx(struct path *path, struct kstat *stat,
1678 static inline void printk_all_partitions(void)
1681 static inline int early_lookup_bdev(const char *pathname, dev_t *dev)
1685 #endif /* CONFIG_BLOCK */
1687 int bdev_freeze(struct block_device *bdev);
1688 int bdev_thaw(struct block_device *bdev);
1689 void bdev_fput(struct file *bdev_file);
1691 struct io_comp_batch {
1692 struct rq_list req_list;
1694 void (*complete)(struct io_comp_batch *);
1697 static inline bool bdev_can_atomic_write(struct block_device *bdev)
1699 struct request_queue *bd_queue = bdev->bd_queue;
1700 struct queue_limits *limits = &bd_queue->limits;
1702 if (!limits->atomic_write_unit_min)
1705 if (bdev_is_partition(bdev)) {
1706 sector_t bd_start_sect = bdev->bd_start_sect;
1707 unsigned int alignment =
1708 max(limits->atomic_write_unit_min,
1709 limits->atomic_write_hw_boundary);
1711 if (!IS_ALIGNED(bd_start_sect, alignment >> SECTOR_SHIFT))
1718 static inline unsigned int
1719 bdev_atomic_write_unit_min_bytes(struct block_device *bdev)
1721 if (!bdev_can_atomic_write(bdev))
1723 return queue_atomic_write_unit_min_bytes(bdev_get_queue(bdev));
1726 static inline unsigned int
1727 bdev_atomic_write_unit_max_bytes(struct block_device *bdev)
1729 if (!bdev_can_atomic_write(bdev))
1731 return queue_atomic_write_unit_max_bytes(bdev_get_queue(bdev));
1734 #define DEFINE_IO_COMP_BATCH(name) struct io_comp_batch name = { }
1736 #endif /* _LINUX_BLKDEV_H */