1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Portions Copyright (C) 1992 Drew Eckhardt
5 #ifndef _LINUX_BLKDEV_H
6 #define _LINUX_BLKDEV_H
8 #include <linux/types.h>
9 #include <linux/blk_types.h>
10 #include <linux/device.h>
11 #include <linux/list.h>
12 #include <linux/llist.h>
13 #include <linux/minmax.h>
14 #include <linux/timer.h>
15 #include <linux/workqueue.h>
16 #include <linux/wait.h>
17 #include <linux/bio.h>
18 #include <linux/gfp.h>
19 #include <linux/kdev_t.h>
20 #include <linux/rcupdate.h>
21 #include <linux/percpu-refcount.h>
22 #include <linux/blkzoned.h>
23 #include <linux/sched.h>
24 #include <linux/sbitmap.h>
25 #include <linux/uuid.h>
26 #include <linux/xarray.h>
30 struct elevator_queue;
35 struct blk_flush_queue;
39 struct blk_queue_stats;
40 struct blk_stat_callback;
41 struct blk_crypto_profile;
43 extern const struct device_type disk_type;
44 extern const struct device_type part_type;
45 extern struct class block_class;
48 * Maximum number of blkcg policies allowed to be registered concurrently.
49 * Defined here to simplify include dependency.
51 #define BLKCG_MAX_POLS 6
53 #define DISK_MAX_PARTS 256
54 #define DISK_NAME_LEN 32
56 #define PARTITION_META_INFO_VOLNAMELTH 64
58 * Enough for the string representation of any kind of UUID plus NULL.
59 * EFI UUID is 36 characters. MSDOS UUID is 11 characters.
61 #define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1)
63 struct partition_meta_info {
64 char uuid[PARTITION_META_INFO_UUIDLTH];
65 u8 volname[PARTITION_META_INFO_VOLNAMELTH];
69 * DOC: genhd capability flags
71 * ``GENHD_FL_REMOVABLE``: indicates that the block device gives access to
72 * removable media. When set, the device remains present even when media is not
73 * inserted. Shall not be set for devices which are removed entirely when the
76 * ``GENHD_FL_HIDDEN``: the block device is hidden; it doesn't produce events,
77 * doesn't appear in sysfs, and can't be opened from userspace or using
78 * blkdev_get*. Used for the underlying components of multipath devices.
80 * ``GENHD_FL_NO_PART``: partition support is disabled. The kernel will not
81 * scan for partitions from add_disk, and users can't add partitions manually.
85 GENHD_FL_REMOVABLE = 1 << 0,
86 GENHD_FL_HIDDEN = 1 << 1,
87 GENHD_FL_NO_PART = 1 << 2,
91 DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */
92 DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */
96 /* Poll even if events_poll_msecs is unset */
97 DISK_EVENT_FLAG_POLL = 1 << 0,
98 /* Forward events to udev */
99 DISK_EVENT_FLAG_UEVENT = 1 << 1,
100 /* Block event polling when open for exclusive write */
101 DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE = 1 << 2,
107 struct blk_integrity {
108 const struct blk_integrity_profile *profile;
110 unsigned char tuple_size;
111 unsigned char interval_exp;
112 unsigned char tag_size;
115 typedef unsigned int __bitwise blk_mode_t;
117 /* open for reading */
118 #define BLK_OPEN_READ ((__force blk_mode_t)(1 << 0))
119 /* open for writing */
120 #define BLK_OPEN_WRITE ((__force blk_mode_t)(1 << 1))
121 /* open exclusively (vs other exclusive openers */
122 #define BLK_OPEN_EXCL ((__force blk_mode_t)(1 << 2))
123 /* opened with O_NDELAY */
124 #define BLK_OPEN_NDELAY ((__force blk_mode_t)(1 << 3))
125 /* open for "writes" only for ioctls (specialy hack for floppy.c) */
126 #define BLK_OPEN_WRITE_IOCTL ((__force blk_mode_t)(1 << 4))
127 /* open is exclusive wrt all other BLK_OPEN_WRITE opens to the device */
128 #define BLK_OPEN_RESTRICT_WRITES ((__force blk_mode_t)(1 << 5))
132 * major/first_minor/minors should not be set by any new driver, the
133 * block core will take care of allocating them automatically.
139 char disk_name[DISK_NAME_LEN]; /* name of major driver */
141 unsigned short events; /* supported events */
142 unsigned short event_flags; /* flags related to event processing */
144 struct xarray part_tbl;
145 struct block_device *part0;
147 const struct block_device_operations *fops;
148 struct request_queue *queue;
151 struct bio_set bio_split;
155 #define GD_NEED_PART_SCAN 0
156 #define GD_READ_ONLY 1
158 #define GD_NATIVE_CAPACITY 3
160 #define GD_SUPPRESS_PART_SCAN 5
161 #define GD_OWNS_QUEUE 6
163 struct mutex open_mutex; /* open/close mutex */
164 unsigned open_partitions; /* number of open partitions */
166 struct backing_dev_info *bdi;
167 struct kobject queue_kobj; /* the queue/ directory */
168 struct kobject *slave_dir;
169 #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED
170 struct list_head slave_bdevs;
172 struct timer_rand_state *random;
173 atomic_t sync_io; /* RAID */
174 struct disk_events *ev;
176 #ifdef CONFIG_BLK_DEV_ZONED
178 * Zoned block device information for request dispatch control.
179 * nr_zones is the total number of zones of the device. This is always
180 * 0 for regular block devices. conv_zones_bitmap is a bitmap of nr_zones
181 * bits which indicates if a zone is conventional (bit set) or
182 * sequential (bit clear). seq_zones_wlock is a bitmap of nr_zones
183 * bits which indicates if a zone is write locked, that is, if a write
184 * request targeting the zone was dispatched.
186 * Reads of this information must be protected with blk_queue_enter() /
187 * blk_queue_exit(). Modifying this information is only allowed while
188 * no requests are being processed. See also blk_mq_freeze_queue() and
189 * blk_mq_unfreeze_queue().
191 unsigned int nr_zones;
192 unsigned int max_open_zones;
193 unsigned int max_active_zones;
194 unsigned long *conv_zones_bitmap;
195 unsigned long *seq_zones_wlock;
196 #endif /* CONFIG_BLK_DEV_ZONED */
198 #if IS_ENABLED(CONFIG_CDROM)
199 struct cdrom_device_info *cdi;
202 struct badblocks *bb;
203 struct lockdep_map lockdep_map;
205 blk_mode_t open_mode;
208 * Independent sector access ranges. This is always NULL for
209 * devices that do not have multiple independent access ranges.
211 struct blk_independent_access_ranges *ia_ranges;
214 static inline bool disk_live(struct gendisk *disk)
216 return !inode_unhashed(disk->part0->bd_inode);
220 * disk_openers - returns how many openers are there for a disk
221 * @disk: disk to check
223 * This returns the number of openers for a disk. Note that this value is only
224 * stable if disk->open_mutex is held.
226 * Note: Due to a quirk in the block layer open code, each open partition is
227 * only counted once even if there are multiple openers.
229 static inline unsigned int disk_openers(struct gendisk *disk)
231 return atomic_read(&disk->part0->bd_openers);
235 * The gendisk is refcounted by the part0 block_device, and the bd_device
236 * therein is also used for device model presentation in sysfs.
238 #define dev_to_disk(device) \
239 (dev_to_bdev(device)->bd_disk)
240 #define disk_to_dev(disk) \
241 (&((disk)->part0->bd_device))
243 #if IS_REACHABLE(CONFIG_CDROM)
244 #define disk_to_cdi(disk) ((disk)->cdi)
246 #define disk_to_cdi(disk) NULL
249 static inline dev_t disk_devt(struct gendisk *disk)
251 return MKDEV(disk->major, disk->first_minor);
254 static inline int blk_validate_block_size(unsigned long bsize)
256 if (bsize < 512 || bsize > PAGE_SIZE || !is_power_of_2(bsize))
262 static inline bool blk_op_is_passthrough(blk_opf_t op)
265 return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT;
269 * BLK_BOUNCE_NONE: never bounce (default)
270 * BLK_BOUNCE_HIGH: bounce all highmem pages
277 struct queue_limits {
278 enum blk_bounce bounce;
279 unsigned long seg_boundary_mask;
280 unsigned long virt_boundary_mask;
282 unsigned int max_hw_sectors;
283 unsigned int max_dev_sectors;
284 unsigned int chunk_sectors;
285 unsigned int max_sectors;
286 unsigned int max_user_sectors;
287 unsigned int max_segment_size;
288 unsigned int physical_block_size;
289 unsigned int logical_block_size;
290 unsigned int alignment_offset;
293 unsigned int max_discard_sectors;
294 unsigned int max_hw_discard_sectors;
295 unsigned int max_secure_erase_sectors;
296 unsigned int max_write_zeroes_sectors;
297 unsigned int max_zone_append_sectors;
298 unsigned int discard_granularity;
299 unsigned int discard_alignment;
300 unsigned int zone_write_granularity;
302 unsigned short max_segments;
303 unsigned short max_integrity_segments;
304 unsigned short max_discard_segments;
306 unsigned char misaligned;
307 unsigned char discard_misaligned;
308 unsigned char raid_partial_stripes_expensive;
312 * Drivers that set dma_alignment to less than 511 must be prepared to
313 * handle individual bvec's that are not a multiple of a SECTOR_SIZE
314 * due to possible offsets.
316 unsigned int dma_alignment;
319 typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx,
322 void disk_set_zoned(struct gendisk *disk);
324 #define BLK_ALL_ZONES ((unsigned int)-1)
325 int blkdev_report_zones(struct block_device *bdev, sector_t sector,
326 unsigned int nr_zones, report_zones_cb cb, void *data);
327 int blkdev_zone_mgmt(struct block_device *bdev, enum req_op op,
328 sector_t sectors, sector_t nr_sectors, gfp_t gfp_mask);
329 int blk_revalidate_disk_zones(struct gendisk *disk,
330 void (*update_driver_data)(struct gendisk *disk));
333 * Independent access ranges: struct blk_independent_access_range describes
334 * a range of contiguous sectors that can be accessed using device command
335 * execution resources that are independent from the resources used for
336 * other access ranges. This is typically found with single-LUN multi-actuator
337 * HDDs where each access range is served by a different set of heads.
338 * The set of independent ranges supported by the device is defined using
339 * struct blk_independent_access_ranges. The independent ranges must not overlap
340 * and must include all sectors within the disk capacity (no sector holes
342 * For a device with multiple ranges, requests targeting sectors in different
343 * ranges can be executed in parallel. A request can straddle an access range
346 struct blk_independent_access_range {
352 struct blk_independent_access_ranges {
354 bool sysfs_registered;
355 unsigned int nr_ia_ranges;
356 struct blk_independent_access_range ia_range[];
359 struct request_queue {
361 * The queue owner gets to use this for whatever they like.
362 * ll_rw_blk doesn't touch it.
366 struct elevator_queue *elevator;
368 const struct blk_mq_ops *mq_ops;
371 struct blk_mq_ctx __percpu *queue_ctx;
374 * various queue flags, see QUEUE_* below
376 unsigned long queue_flags;
378 unsigned int rq_timeout;
380 unsigned int queue_depth;
384 /* hw dispatch queues */
385 unsigned int nr_hw_queues;
386 struct xarray hctx_table;
388 struct percpu_ref q_usage_counter;
390 struct request *last_merge;
392 spinlock_t queue_lock;
396 struct gendisk *disk;
401 struct kobject *mq_kobj;
403 struct queue_limits limits;
405 #ifdef CONFIG_BLK_DEV_INTEGRITY
406 struct blk_integrity integrity;
407 #endif /* CONFIG_BLK_DEV_INTEGRITY */
411 enum rpm_status rpm_status;
415 * Number of contexts that have called blk_set_pm_only(). If this
416 * counter is above zero then only RQF_PM requests are processed.
420 struct blk_queue_stats *stats;
421 struct rq_qos *rq_qos;
422 struct mutex rq_qos_mutex;
425 * ida allocated id for this queue. Used to index queues from
430 unsigned int dma_pad_mask;
435 unsigned long nr_requests; /* Max # of requests */
437 #ifdef CONFIG_BLK_INLINE_ENCRYPTION
438 struct blk_crypto_profile *crypto_profile;
439 struct kobject *crypto_kobject;
442 struct timer_list timeout;
443 struct work_struct timeout_work;
445 atomic_t nr_active_requests_shared_tags;
447 unsigned int required_elevator_features;
449 struct blk_mq_tags *sched_shared_tags;
451 struct list_head icq_list;
452 #ifdef CONFIG_BLK_CGROUP
453 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
454 struct blkcg_gq *root_blkg;
455 struct list_head blkg_list;
456 struct mutex blkcg_mutex;
461 spinlock_t requeue_lock;
462 struct list_head requeue_list;
463 struct delayed_work requeue_work;
465 #ifdef CONFIG_BLK_DEV_IO_TRACE
466 struct blk_trace __rcu *blk_trace;
469 * for flush operations
471 struct blk_flush_queue *fq;
472 struct list_head flush_list;
474 struct mutex sysfs_lock;
475 struct mutex sysfs_dir_lock;
478 * for reusing dead hctx instance in case of updating
481 struct list_head unused_hctx_list;
482 spinlock_t unused_hctx_lock;
486 #ifdef CONFIG_BLK_DEV_THROTTLING
488 struct throtl_data *td;
490 struct rcu_head rcu_head;
491 wait_queue_head_t mq_freeze_wq;
493 * Protect concurrent access to q_usage_counter by
494 * percpu_ref_kill() and percpu_ref_reinit().
496 struct mutex mq_freeze_lock;
498 struct blk_mq_tag_set *tag_set;
499 struct list_head tag_set_list;
501 struct dentry *debugfs_dir;
502 struct dentry *sched_debugfs_dir;
503 struct dentry *rqos_debugfs_dir;
505 * Serializes all debugfs metadata operations using the above dentries.
507 struct mutex debugfs_mutex;
509 bool mq_sysfs_init_done;
512 /* Keep blk_queue_flag_name[] in sync with the definitions below */
513 #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */
514 #define QUEUE_FLAG_DYING 1 /* queue being torn down */
515 #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */
516 #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */
517 #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */
518 #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */
519 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
520 #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */
521 #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */
522 #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */
523 #define QUEUE_FLAG_SYNCHRONOUS 11 /* always completes in submit context */
524 #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */
525 #define QUEUE_FLAG_HW_WC 13 /* Write back caching supported */
526 #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */
527 #define QUEUE_FLAG_STABLE_WRITES 15 /* don't modify blks until WB is done */
528 #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */
529 #define QUEUE_FLAG_WC 17 /* Write back caching */
530 #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */
531 #define QUEUE_FLAG_DAX 19 /* device supports DAX */
532 #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */
533 #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */
534 #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */
535 #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */
536 #define QUEUE_FLAG_ZONE_RESETALL 26 /* supports Zone Reset All */
537 #define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */
538 #define QUEUE_FLAG_HCTX_ACTIVE 28 /* at least one blk-mq hctx is active */
539 #define QUEUE_FLAG_NOWAIT 29 /* device supports NOWAIT */
540 #define QUEUE_FLAG_SQ_SCHED 30 /* single queue style io dispatch */
541 #define QUEUE_FLAG_SKIP_TAGSET_QUIESCE 31 /* quiesce_tagset skip the queue*/
543 #define QUEUE_FLAG_MQ_DEFAULT ((1UL << QUEUE_FLAG_IO_STAT) | \
544 (1UL << QUEUE_FLAG_SAME_COMP) | \
545 (1UL << QUEUE_FLAG_NOWAIT))
547 void blk_queue_flag_set(unsigned int flag, struct request_queue *q);
548 void blk_queue_flag_clear(unsigned int flag, struct request_queue *q);
549 bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
551 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
552 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
553 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
554 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
555 #define blk_queue_noxmerges(q) \
556 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
557 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
558 #define blk_queue_stable_writes(q) \
559 test_bit(QUEUE_FLAG_STABLE_WRITES, &(q)->queue_flags)
560 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
561 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
562 #define blk_queue_zone_resetall(q) \
563 test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags)
564 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
565 #define blk_queue_pci_p2pdma(q) \
566 test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags)
567 #ifdef CONFIG_BLK_RQ_ALLOC_TIME
568 #define blk_queue_rq_alloc_time(q) \
569 test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags)
571 #define blk_queue_rq_alloc_time(q) false
574 #define blk_noretry_request(rq) \
575 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
576 REQ_FAILFAST_DRIVER))
577 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
578 #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only)
579 #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags)
580 #define blk_queue_sq_sched(q) test_bit(QUEUE_FLAG_SQ_SCHED, &(q)->queue_flags)
581 #define blk_queue_skip_tagset_quiesce(q) \
582 test_bit(QUEUE_FLAG_SKIP_TAGSET_QUIESCE, &(q)->queue_flags)
584 extern void blk_set_pm_only(struct request_queue *q);
585 extern void blk_clear_pm_only(struct request_queue *q);
587 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
589 #define dma_map_bvec(dev, bv, dir, attrs) \
590 dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \
593 static inline bool queue_is_mq(struct request_queue *q)
599 static inline enum rpm_status queue_rpm_status(struct request_queue *q)
601 return q->rpm_status;
604 static inline enum rpm_status queue_rpm_status(struct request_queue *q)
610 static inline bool blk_queue_is_zoned(struct request_queue *q)
612 return IS_ENABLED(CONFIG_BLK_DEV_ZONED) && q->limits.zoned;
615 #ifdef CONFIG_BLK_DEV_ZONED
616 unsigned int bdev_nr_zones(struct block_device *bdev);
618 static inline unsigned int disk_nr_zones(struct gendisk *disk)
620 return blk_queue_is_zoned(disk->queue) ? disk->nr_zones : 0;
623 static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector)
625 if (!blk_queue_is_zoned(disk->queue))
627 return sector >> ilog2(disk->queue->limits.chunk_sectors);
630 static inline bool disk_zone_is_seq(struct gendisk *disk, sector_t sector)
632 if (!blk_queue_is_zoned(disk->queue))
634 if (!disk->conv_zones_bitmap)
636 return !test_bit(disk_zone_no(disk, sector), disk->conv_zones_bitmap);
639 static inline void disk_set_max_open_zones(struct gendisk *disk,
640 unsigned int max_open_zones)
642 disk->max_open_zones = max_open_zones;
645 static inline void disk_set_max_active_zones(struct gendisk *disk,
646 unsigned int max_active_zones)
648 disk->max_active_zones = max_active_zones;
651 static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
653 return bdev->bd_disk->max_open_zones;
656 static inline unsigned int bdev_max_active_zones(struct block_device *bdev)
658 return bdev->bd_disk->max_active_zones;
661 #else /* CONFIG_BLK_DEV_ZONED */
662 static inline unsigned int bdev_nr_zones(struct block_device *bdev)
667 static inline unsigned int disk_nr_zones(struct gendisk *disk)
671 static inline bool disk_zone_is_seq(struct gendisk *disk, sector_t sector)
675 static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector)
679 static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
684 static inline unsigned int bdev_max_active_zones(struct block_device *bdev)
688 #endif /* CONFIG_BLK_DEV_ZONED */
690 static inline unsigned int blk_queue_depth(struct request_queue *q)
693 return q->queue_depth;
695 return q->nr_requests;
699 * default timeout for SG_IO if none specified
701 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
702 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
704 /* This should not be used directly - use rq_for_each_segment */
705 #define for_each_bio(_bio) \
706 for (; _bio; _bio = _bio->bi_next)
708 int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
709 const struct attribute_group **groups);
710 static inline int __must_check add_disk(struct gendisk *disk)
712 return device_add_disk(NULL, disk, NULL);
714 void del_gendisk(struct gendisk *gp);
715 void invalidate_disk(struct gendisk *disk);
716 void set_disk_ro(struct gendisk *disk, bool read_only);
717 void disk_uevent(struct gendisk *disk, enum kobject_action action);
719 static inline int get_disk_ro(struct gendisk *disk)
721 return disk->part0->bd_read_only ||
722 test_bit(GD_READ_ONLY, &disk->state);
725 static inline int bdev_read_only(struct block_device *bdev)
727 return bdev->bd_read_only || get_disk_ro(bdev->bd_disk);
730 bool set_capacity_and_notify(struct gendisk *disk, sector_t size);
731 void disk_force_media_change(struct gendisk *disk);
732 void bdev_mark_dead(struct block_device *bdev, bool surprise);
734 void add_disk_randomness(struct gendisk *disk) __latent_entropy;
735 void rand_initialize_disk(struct gendisk *disk);
737 static inline sector_t get_start_sect(struct block_device *bdev)
739 return bdev->bd_start_sect;
742 static inline sector_t bdev_nr_sectors(struct block_device *bdev)
744 return bdev->bd_nr_sectors;
747 static inline loff_t bdev_nr_bytes(struct block_device *bdev)
749 return (loff_t)bdev_nr_sectors(bdev) << SECTOR_SHIFT;
752 static inline sector_t get_capacity(struct gendisk *disk)
754 return bdev_nr_sectors(disk->part0);
757 static inline u64 sb_bdev_nr_blocks(struct super_block *sb)
759 return bdev_nr_sectors(sb->s_bdev) >>
760 (sb->s_blocksize_bits - SECTOR_SHIFT);
763 int bdev_disk_changed(struct gendisk *disk, bool invalidate);
765 void put_disk(struct gendisk *disk);
766 struct gendisk *__blk_alloc_disk(int node, struct lock_class_key *lkclass);
769 * blk_alloc_disk - allocate a gendisk structure
770 * @node_id: numa node to allocate on
772 * Allocate and pre-initialize a gendisk structure for use with BIO based
777 #define blk_alloc_disk(node_id) \
779 static struct lock_class_key __key; \
781 __blk_alloc_disk(node_id, &__key); \
784 int __register_blkdev(unsigned int major, const char *name,
785 void (*probe)(dev_t devt));
786 #define register_blkdev(major, name) \
787 __register_blkdev(major, name, NULL)
788 void unregister_blkdev(unsigned int major, const char *name);
790 bool disk_check_media_change(struct gendisk *disk);
791 void set_capacity(struct gendisk *disk, sector_t size);
793 #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED
794 int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
795 void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk);
797 static inline int bd_link_disk_holder(struct block_device *bdev,
798 struct gendisk *disk)
802 static inline void bd_unlink_disk_holder(struct block_device *bdev,
803 struct gendisk *disk)
806 #endif /* CONFIG_BLOCK_HOLDER_DEPRECATED */
808 dev_t part_devt(struct gendisk *disk, u8 partno);
809 void inc_diskseq(struct gendisk *disk);
810 void blk_request_module(dev_t devt);
812 extern int blk_register_queue(struct gendisk *disk);
813 extern void blk_unregister_queue(struct gendisk *disk);
814 void submit_bio_noacct(struct bio *bio);
815 struct bio *bio_split_to_limits(struct bio *bio);
817 extern int blk_lld_busy(struct request_queue *q);
818 extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags);
819 extern void blk_queue_exit(struct request_queue *q);
820 extern void blk_sync_queue(struct request_queue *q);
822 /* Helper to convert REQ_OP_XXX to its string format XXX */
823 extern const char *blk_op_str(enum req_op op);
825 int blk_status_to_errno(blk_status_t status);
826 blk_status_t errno_to_blk_status(int errno);
827 const char *blk_status_to_str(blk_status_t status);
829 /* only poll the hardware once, don't continue until a completion was found */
830 #define BLK_POLL_ONESHOT (1 << 0)
831 int bio_poll(struct bio *bio, struct io_comp_batch *iob, unsigned int flags);
832 int iocb_bio_iopoll(struct kiocb *kiocb, struct io_comp_batch *iob,
835 static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
837 return bdev->bd_queue; /* this is never NULL */
840 /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */
841 const char *blk_zone_cond_str(enum blk_zone_cond zone_cond);
843 static inline unsigned int bio_zone_no(struct bio *bio)
845 return disk_zone_no(bio->bi_bdev->bd_disk, bio->bi_iter.bi_sector);
848 static inline unsigned int bio_zone_is_seq(struct bio *bio)
850 return disk_zone_is_seq(bio->bi_bdev->bd_disk, bio->bi_iter.bi_sector);
854 * Return how much of the chunk is left to be used for I/O at a given offset.
856 static inline unsigned int blk_chunk_sectors_left(sector_t offset,
857 unsigned int chunk_sectors)
859 if (unlikely(!is_power_of_2(chunk_sectors)))
860 return chunk_sectors - sector_div(offset, chunk_sectors);
861 return chunk_sectors - (offset & (chunk_sectors - 1));
865 * Access functions for manipulating queue properties
867 void blk_queue_bounce_limit(struct request_queue *q, enum blk_bounce limit);
868 extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
869 extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
870 extern void blk_queue_max_segments(struct request_queue *, unsigned short);
871 extern void blk_queue_max_discard_segments(struct request_queue *,
873 void blk_queue_max_secure_erase_sectors(struct request_queue *q,
874 unsigned int max_sectors);
875 extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
876 extern void blk_queue_max_discard_sectors(struct request_queue *q,
877 unsigned int max_discard_sectors);
878 extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
879 unsigned int max_write_same_sectors);
880 extern void blk_queue_logical_block_size(struct request_queue *, unsigned int);
881 extern void blk_queue_max_zone_append_sectors(struct request_queue *q,
882 unsigned int max_zone_append_sectors);
883 extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
884 void blk_queue_zone_write_granularity(struct request_queue *q,
886 extern void blk_queue_alignment_offset(struct request_queue *q,
887 unsigned int alignment);
888 void disk_update_readahead(struct gendisk *disk);
889 extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
890 extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
891 extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
892 extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
893 extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
894 extern void blk_set_stacking_limits(struct queue_limits *lim);
895 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
897 extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
899 extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
900 extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
901 extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
902 extern void blk_queue_dma_alignment(struct request_queue *, int);
903 extern void blk_queue_update_dma_alignment(struct request_queue *, int);
904 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
905 extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
907 struct blk_independent_access_ranges *
908 disk_alloc_independent_access_ranges(struct gendisk *disk, int nr_ia_ranges);
909 void disk_set_independent_access_ranges(struct gendisk *disk,
910 struct blk_independent_access_ranges *iars);
913 * Elevator features for blk_queue_required_elevator_features:
915 /* Supports zoned block devices sequential write constraint */
916 #define ELEVATOR_F_ZBD_SEQ_WRITE (1U << 0)
918 extern void blk_queue_required_elevator_features(struct request_queue *q,
919 unsigned int features);
920 extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q,
923 bool __must_check blk_get_queue(struct request_queue *);
924 extern void blk_put_queue(struct request_queue *);
926 void blk_mark_disk_dead(struct gendisk *disk);
930 * blk_plug permits building a queue of related requests by holding the I/O
931 * fragments for a short period. This allows merging of sequential requests
932 * into single larger request. As the requests are moved from a per-task list to
933 * the device's request_queue in a batch, this results in improved scalability
934 * as the lock contention for request_queue lock is reduced.
936 * It is ok not to disable preemption when adding the request to the plug list
937 * or when attempting a merge. For details, please see schedule() where
938 * blk_flush_plug() is called.
941 struct request *mq_list; /* blk-mq requests */
943 /* if ios_left is > 1, we can batch tag/rq allocations */
944 struct request *cached_rq;
945 unsigned short nr_ios;
947 unsigned short rq_count;
949 bool multiple_queues;
952 struct list_head cb_list; /* md requires an unplug callback */
956 typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
958 struct list_head list;
959 blk_plug_cb_fn callback;
962 extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
963 void *data, int size);
964 extern void blk_start_plug(struct blk_plug *);
965 extern void blk_start_plug_nr_ios(struct blk_plug *, unsigned short);
966 extern void blk_finish_plug(struct blk_plug *);
968 void __blk_flush_plug(struct blk_plug *plug, bool from_schedule);
969 static inline void blk_flush_plug(struct blk_plug *plug, bool async)
972 __blk_flush_plug(plug, async);
975 int blkdev_issue_flush(struct block_device *bdev);
976 long nr_blockdev_pages(void);
977 #else /* CONFIG_BLOCK */
981 static inline void blk_start_plug_nr_ios(struct blk_plug *plug,
982 unsigned short nr_ios)
986 static inline void blk_start_plug(struct blk_plug *plug)
990 static inline void blk_finish_plug(struct blk_plug *plug)
994 static inline void blk_flush_plug(struct blk_plug *plug, bool async)
998 static inline int blkdev_issue_flush(struct block_device *bdev)
1003 static inline long nr_blockdev_pages(void)
1007 #endif /* CONFIG_BLOCK */
1009 extern void blk_io_schedule(void);
1011 int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1012 sector_t nr_sects, gfp_t gfp_mask);
1013 int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1014 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop);
1015 int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector,
1016 sector_t nr_sects, gfp_t gfp);
1018 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
1019 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
1021 extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1022 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
1024 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1025 sector_t nr_sects, gfp_t gfp_mask, unsigned flags);
1027 static inline int sb_issue_discard(struct super_block *sb, sector_t block,
1028 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
1030 return blkdev_issue_discard(sb->s_bdev,
1031 block << (sb->s_blocksize_bits -
1033 nr_blocks << (sb->s_blocksize_bits -
1037 static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
1038 sector_t nr_blocks, gfp_t gfp_mask)
1040 return blkdev_issue_zeroout(sb->s_bdev,
1041 block << (sb->s_blocksize_bits -
1043 nr_blocks << (sb->s_blocksize_bits -
1048 static inline bool bdev_is_partition(struct block_device *bdev)
1050 return bdev->bd_partno;
1053 enum blk_default_limits {
1054 BLK_MAX_SEGMENTS = 128,
1055 BLK_SAFE_MAX_SECTORS = 255,
1056 BLK_MAX_SEGMENT_SIZE = 65536,
1057 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
1061 * Default upper limit for the software max_sectors limit used for
1062 * regular file system I/O. This can be increased through sysfs.
1064 * Not to be confused with the max_hw_sector limit that is entirely
1065 * controlled by the driver, usually based on hardware limits.
1067 #define BLK_DEF_MAX_SECTORS_CAP 2560u
1069 static inline unsigned long queue_segment_boundary(const struct request_queue *q)
1071 return q->limits.seg_boundary_mask;
1074 static inline unsigned long queue_virt_boundary(const struct request_queue *q)
1076 return q->limits.virt_boundary_mask;
1079 static inline unsigned int queue_max_sectors(const struct request_queue *q)
1081 return q->limits.max_sectors;
1084 static inline unsigned int queue_max_bytes(struct request_queue *q)
1086 return min_t(unsigned int, queue_max_sectors(q), INT_MAX >> 9) << 9;
1089 static inline unsigned int queue_max_hw_sectors(const struct request_queue *q)
1091 return q->limits.max_hw_sectors;
1094 static inline unsigned short queue_max_segments(const struct request_queue *q)
1096 return q->limits.max_segments;
1099 static inline unsigned short queue_max_discard_segments(const struct request_queue *q)
1101 return q->limits.max_discard_segments;
1104 static inline unsigned int queue_max_segment_size(const struct request_queue *q)
1106 return q->limits.max_segment_size;
1109 static inline unsigned int queue_max_zone_append_sectors(const struct request_queue *q)
1112 const struct queue_limits *l = &q->limits;
1114 return min(l->max_zone_append_sectors, l->max_sectors);
1117 static inline unsigned int
1118 bdev_max_zone_append_sectors(struct block_device *bdev)
1120 return queue_max_zone_append_sectors(bdev_get_queue(bdev));
1123 static inline unsigned int bdev_max_segments(struct block_device *bdev)
1125 return queue_max_segments(bdev_get_queue(bdev));
1128 static inline unsigned queue_logical_block_size(const struct request_queue *q)
1132 if (q && q->limits.logical_block_size)
1133 retval = q->limits.logical_block_size;
1138 static inline unsigned int bdev_logical_block_size(struct block_device *bdev)
1140 return queue_logical_block_size(bdev_get_queue(bdev));
1143 static inline unsigned int queue_physical_block_size(const struct request_queue *q)
1145 return q->limits.physical_block_size;
1148 static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
1150 return queue_physical_block_size(bdev_get_queue(bdev));
1153 static inline unsigned int queue_io_min(const struct request_queue *q)
1155 return q->limits.io_min;
1158 static inline int bdev_io_min(struct block_device *bdev)
1160 return queue_io_min(bdev_get_queue(bdev));
1163 static inline unsigned int queue_io_opt(const struct request_queue *q)
1165 return q->limits.io_opt;
1168 static inline int bdev_io_opt(struct block_device *bdev)
1170 return queue_io_opt(bdev_get_queue(bdev));
1173 static inline unsigned int
1174 queue_zone_write_granularity(const struct request_queue *q)
1176 return q->limits.zone_write_granularity;
1179 static inline unsigned int
1180 bdev_zone_write_granularity(struct block_device *bdev)
1182 return queue_zone_write_granularity(bdev_get_queue(bdev));
1185 int bdev_alignment_offset(struct block_device *bdev);
1186 unsigned int bdev_discard_alignment(struct block_device *bdev);
1188 static inline unsigned int bdev_max_discard_sectors(struct block_device *bdev)
1190 return bdev_get_queue(bdev)->limits.max_discard_sectors;
1193 static inline unsigned int bdev_discard_granularity(struct block_device *bdev)
1195 return bdev_get_queue(bdev)->limits.discard_granularity;
1198 static inline unsigned int
1199 bdev_max_secure_erase_sectors(struct block_device *bdev)
1201 return bdev_get_queue(bdev)->limits.max_secure_erase_sectors;
1204 static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
1206 struct request_queue *q = bdev_get_queue(bdev);
1209 return q->limits.max_write_zeroes_sectors;
1214 static inline bool bdev_nonrot(struct block_device *bdev)
1216 return blk_queue_nonrot(bdev_get_queue(bdev));
1219 static inline bool bdev_synchronous(struct block_device *bdev)
1221 return test_bit(QUEUE_FLAG_SYNCHRONOUS,
1222 &bdev_get_queue(bdev)->queue_flags);
1225 static inline bool bdev_stable_writes(struct block_device *bdev)
1227 return test_bit(QUEUE_FLAG_STABLE_WRITES,
1228 &bdev_get_queue(bdev)->queue_flags);
1231 static inline bool bdev_write_cache(struct block_device *bdev)
1233 return test_bit(QUEUE_FLAG_WC, &bdev_get_queue(bdev)->queue_flags);
1236 static inline bool bdev_fua(struct block_device *bdev)
1238 return test_bit(QUEUE_FLAG_FUA, &bdev_get_queue(bdev)->queue_flags);
1241 static inline bool bdev_nowait(struct block_device *bdev)
1243 return test_bit(QUEUE_FLAG_NOWAIT, &bdev_get_queue(bdev)->queue_flags);
1246 static inline bool bdev_is_zoned(struct block_device *bdev)
1248 return blk_queue_is_zoned(bdev_get_queue(bdev));
1251 static inline unsigned int bdev_zone_no(struct block_device *bdev, sector_t sec)
1253 return disk_zone_no(bdev->bd_disk, sec);
1256 /* Whether write serialization is required for @op on zoned devices. */
1257 static inline bool op_needs_zoned_write_locking(enum req_op op)
1259 return op == REQ_OP_WRITE || op == REQ_OP_WRITE_ZEROES;
1262 static inline bool bdev_op_is_zoned_write(struct block_device *bdev,
1265 return bdev_is_zoned(bdev) && op_needs_zoned_write_locking(op);
1268 static inline sector_t bdev_zone_sectors(struct block_device *bdev)
1270 struct request_queue *q = bdev_get_queue(bdev);
1272 if (!blk_queue_is_zoned(q))
1274 return q->limits.chunk_sectors;
1277 static inline sector_t bdev_offset_from_zone_start(struct block_device *bdev,
1280 return sector & (bdev_zone_sectors(bdev) - 1);
1283 static inline bool bdev_is_zone_start(struct block_device *bdev,
1286 return bdev_offset_from_zone_start(bdev, sector) == 0;
1289 static inline int queue_dma_alignment(const struct request_queue *q)
1291 return q ? q->limits.dma_alignment : 511;
1294 static inline unsigned int bdev_dma_alignment(struct block_device *bdev)
1296 return queue_dma_alignment(bdev_get_queue(bdev));
1299 static inline bool bdev_iter_is_aligned(struct block_device *bdev,
1300 struct iov_iter *iter)
1302 return iov_iter_is_aligned(iter, bdev_dma_alignment(bdev),
1303 bdev_logical_block_size(bdev) - 1);
1306 static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
1309 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
1310 return !(addr & alignment) && !(len & alignment);
1313 /* assumes size > 256 */
1314 static inline unsigned int blksize_bits(unsigned int size)
1316 return order_base_2(size >> SECTOR_SHIFT) + SECTOR_SHIFT;
1319 static inline unsigned int block_size(struct block_device *bdev)
1321 return 1 << bdev->bd_inode->i_blkbits;
1324 int kblockd_schedule_work(struct work_struct *work);
1325 int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
1327 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1328 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1329 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1330 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1332 #ifdef CONFIG_BLK_INLINE_ENCRYPTION
1334 bool blk_crypto_register(struct blk_crypto_profile *profile,
1335 struct request_queue *q);
1337 #else /* CONFIG_BLK_INLINE_ENCRYPTION */
1339 static inline bool blk_crypto_register(struct blk_crypto_profile *profile,
1340 struct request_queue *q)
1345 #endif /* CONFIG_BLK_INLINE_ENCRYPTION */
1347 enum blk_unique_id {
1348 /* these match the Designator Types specified in SPC */
1354 struct block_device_operations {
1355 void (*submit_bio)(struct bio *bio);
1356 int (*poll_bio)(struct bio *bio, struct io_comp_batch *iob,
1357 unsigned int flags);
1358 int (*open)(struct gendisk *disk, blk_mode_t mode);
1359 void (*release)(struct gendisk *disk);
1360 int (*ioctl)(struct block_device *bdev, blk_mode_t mode,
1361 unsigned cmd, unsigned long arg);
1362 int (*compat_ioctl)(struct block_device *bdev, blk_mode_t mode,
1363 unsigned cmd, unsigned long arg);
1364 unsigned int (*check_events) (struct gendisk *disk,
1365 unsigned int clearing);
1366 void (*unlock_native_capacity) (struct gendisk *);
1367 int (*getgeo)(struct block_device *, struct hd_geometry *);
1368 int (*set_read_only)(struct block_device *bdev, bool ro);
1369 void (*free_disk)(struct gendisk *disk);
1370 /* this callback is with swap_lock and sometimes page table lock held */
1371 void (*swap_slot_free_notify) (struct block_device *, unsigned long);
1372 int (*report_zones)(struct gendisk *, sector_t sector,
1373 unsigned int nr_zones, report_zones_cb cb, void *data);
1374 char *(*devnode)(struct gendisk *disk, umode_t *mode);
1375 /* returns the length of the identifier or a negative errno: */
1376 int (*get_unique_id)(struct gendisk *disk, u8 id[16],
1377 enum blk_unique_id id_type);
1378 struct module *owner;
1379 const struct pr_ops *pr_ops;
1382 * Special callback for probing GPT entry at a given sector.
1383 * Needed by Android devices, used by GPT scanner and MMC blk
1386 int (*alternative_gpt_sector)(struct gendisk *disk, sector_t *sector);
1389 #ifdef CONFIG_COMPAT
1390 extern int blkdev_compat_ptr_ioctl(struct block_device *, blk_mode_t,
1391 unsigned int, unsigned long);
1393 #define blkdev_compat_ptr_ioctl NULL
1396 static inline void blk_wake_io_task(struct task_struct *waiter)
1399 * If we're polling, the task itself is doing the completions. For
1400 * that case, we don't need to signal a wakeup, it's enough to just
1401 * mark us as RUNNING.
1403 if (waiter == current)
1404 __set_current_state(TASK_RUNNING);
1406 wake_up_process(waiter);
1409 unsigned long bdev_start_io_acct(struct block_device *bdev, enum req_op op,
1410 unsigned long start_time);
1411 void bdev_end_io_acct(struct block_device *bdev, enum req_op op,
1412 unsigned int sectors, unsigned long start_time);
1414 unsigned long bio_start_io_acct(struct bio *bio);
1415 void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time,
1416 struct block_device *orig_bdev);
1419 * bio_end_io_acct - end I/O accounting for bio based drivers
1420 * @bio: bio to end account for
1421 * @start_time: start time returned by bio_start_io_acct()
1423 static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time)
1425 return bio_end_io_acct_remapped(bio, start_time, bio->bi_bdev);
1428 int bdev_read_only(struct block_device *bdev);
1429 int set_blocksize(struct block_device *bdev, int size);
1431 int lookup_bdev(const char *pathname, dev_t *dev);
1433 void blkdev_show(struct seq_file *seqf, off_t offset);
1435 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1436 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
1438 #define BLKDEV_MAJOR_MAX 512
1440 #define BLKDEV_MAJOR_MAX 0
1443 struct blk_holder_ops {
1444 void (*mark_dead)(struct block_device *bdev, bool surprise);
1447 * Sync the file system mounted on the block device.
1449 void (*sync)(struct block_device *bdev);
1452 * Freeze the file system mounted on the block device.
1454 int (*freeze)(struct block_device *bdev);
1457 * Thaw the file system mounted on the block device.
1459 int (*thaw)(struct block_device *bdev);
1463 * For filesystems using @fs_holder_ops, the @holder argument passed to
1464 * helpers used to open and claim block devices via
1465 * bd_prepare_to_claim() must point to a superblock.
1467 extern const struct blk_holder_ops fs_holder_ops;
1470 * Return the correct open flags for blkdev_get_by_* for super block flags
1471 * as stored in sb->s_flags.
1473 #define sb_open_mode(flags) \
1474 (BLK_OPEN_READ | BLK_OPEN_RESTRICT_WRITES | \
1475 (((flags) & SB_RDONLY) ? 0 : BLK_OPEN_WRITE))
1477 struct bdev_handle {
1478 struct block_device *bdev;
1483 struct bdev_handle *bdev_open_by_dev(dev_t dev, blk_mode_t mode, void *holder,
1484 const struct blk_holder_ops *hops);
1485 struct bdev_handle *bdev_open_by_path(const char *path, blk_mode_t mode,
1486 void *holder, const struct blk_holder_ops *hops);
1487 int bd_prepare_to_claim(struct block_device *bdev, void *holder,
1488 const struct blk_holder_ops *hops);
1489 void bd_abort_claiming(struct block_device *bdev, void *holder);
1490 void bdev_release(struct bdev_handle *handle);
1492 /* just for blk-cgroup, don't use elsewhere */
1493 struct block_device *blkdev_get_no_open(dev_t dev);
1494 void blkdev_put_no_open(struct block_device *bdev);
1496 struct block_device *I_BDEV(struct inode *inode);
1499 void invalidate_bdev(struct block_device *bdev);
1500 int sync_blockdev(struct block_device *bdev);
1501 int sync_blockdev_range(struct block_device *bdev, loff_t lstart, loff_t lend);
1502 int sync_blockdev_nowait(struct block_device *bdev);
1503 void sync_bdevs(bool wait);
1504 void bdev_statx_dioalign(struct inode *inode, struct kstat *stat);
1505 void printk_all_partitions(void);
1506 int __init early_lookup_bdev(const char *pathname, dev_t *dev);
1508 static inline void invalidate_bdev(struct block_device *bdev)
1511 static inline int sync_blockdev(struct block_device *bdev)
1515 static inline int sync_blockdev_nowait(struct block_device *bdev)
1519 static inline void sync_bdevs(bool wait)
1522 static inline void bdev_statx_dioalign(struct inode *inode, struct kstat *stat)
1525 static inline void printk_all_partitions(void)
1528 static inline int early_lookup_bdev(const char *pathname, dev_t *dev)
1532 #endif /* CONFIG_BLOCK */
1534 int bdev_freeze(struct block_device *bdev);
1535 int bdev_thaw(struct block_device *bdev);
1537 struct io_comp_batch {
1538 struct request *req_list;
1540 void (*complete)(struct io_comp_batch *);
1543 #define DEFINE_IO_COMP_BATCH(name) struct io_comp_batch name = { }
1545 #endif /* _LINUX_BLKDEV_H */