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291 lines
7.9 KiB
291 lines
7.9 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_GENHD_H |
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#define _LINUX_GENHD_H |
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/* |
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* genhd.h Copyright (C) 1992 Drew Eckhardt |
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* Generic hard disk header file by |
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* Drew Eckhardt |
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* |
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* <[email protected]> |
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*/ |
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#include <linux/types.h> |
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#include <linux/kdev_t.h> |
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#include <linux/uuid.h> |
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#include <linux/blk_types.h> |
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#include <linux/device.h> |
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#include <linux/xarray.h> |
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extern const struct device_type disk_type; |
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extern struct device_type part_type; |
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extern struct class block_class; |
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#define DISK_MAX_PARTS 256 |
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#define DISK_NAME_LEN 32 |
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#define PARTITION_META_INFO_VOLNAMELTH 64 |
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/* |
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* Enough for the string representation of any kind of UUID plus NULL. |
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* EFI UUID is 36 characters. MSDOS UUID is 11 characters. |
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*/ |
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#define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1) |
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struct partition_meta_info { |
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char uuid[PARTITION_META_INFO_UUIDLTH]; |
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u8 volname[PARTITION_META_INFO_VOLNAMELTH]; |
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}; |
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/** |
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* DOC: genhd capability flags |
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* |
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* ``GENHD_FL_REMOVABLE``: indicates that the block device gives access to |
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* removable media. When set, the device remains present even when media is not |
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* inserted. Shall not be set for devices which are removed entirely when the |
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* media is removed. |
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* |
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* ``GENHD_FL_HIDDEN``: the block device is hidden; it doesn't produce events, |
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* doesn't appear in sysfs, and can't be opened from userspace or using |
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* blkdev_get*. Used for the underlying components of multipath devices. |
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* |
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* ``GENHD_FL_NO_PART``: partition support is disabled. The kernel will not |
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* scan for partitions from add_disk, and users can't add partitions manually. |
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* |
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*/ |
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enum { |
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GENHD_FL_REMOVABLE = 1 << 0, |
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GENHD_FL_HIDDEN = 1 << 1, |
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GENHD_FL_NO_PART = 1 << 2, |
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}; |
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enum { |
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DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */ |
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DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */ |
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}; |
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enum { |
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/* Poll even if events_poll_msecs is unset */ |
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DISK_EVENT_FLAG_POLL = 1 << 0, |
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/* Forward events to udev */ |
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DISK_EVENT_FLAG_UEVENT = 1 << 1, |
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/* Block event polling when open for exclusive write */ |
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DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE = 1 << 2, |
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}; |
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struct disk_events; |
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struct badblocks; |
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struct blk_integrity { |
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const struct blk_integrity_profile *profile; |
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unsigned char flags; |
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unsigned char tuple_size; |
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unsigned char interval_exp; |
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unsigned char tag_size; |
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}; |
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struct gendisk { |
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/* |
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* major/first_minor/minors should not be set by any new driver, the |
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* block core will take care of allocating them automatically. |
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*/ |
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int major; |
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int first_minor; |
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int minors; |
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char disk_name[DISK_NAME_LEN]; /* name of major driver */ |
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unsigned short events; /* supported events */ |
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unsigned short event_flags; /* flags related to event processing */ |
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struct xarray part_tbl; |
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struct block_device *part0; |
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const struct block_device_operations *fops; |
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struct request_queue *queue; |
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void *private_data; |
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int flags; |
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unsigned long state; |
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#define GD_NEED_PART_SCAN 0 |
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#define GD_READ_ONLY 1 |
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#define GD_DEAD 2 |
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#define GD_NATIVE_CAPACITY 3 |
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struct mutex open_mutex; /* open/close mutex */ |
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unsigned open_partitions; /* number of open partitions */ |
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struct backing_dev_info *bdi; |
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struct kobject *slave_dir; |
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#ifdef CONFIG_BLOCK_HOLDER_DEPRECATED |
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struct list_head slave_bdevs; |
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#endif |
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struct timer_rand_state *random; |
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atomic_t sync_io; /* RAID */ |
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struct disk_events *ev; |
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#ifdef CONFIG_BLK_DEV_INTEGRITY |
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struct kobject integrity_kobj; |
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#endif /* CONFIG_BLK_DEV_INTEGRITY */ |
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#if IS_ENABLED(CONFIG_CDROM) |
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struct cdrom_device_info *cdi; |
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#endif |
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int node_id; |
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struct badblocks *bb; |
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struct lockdep_map lockdep_map; |
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u64 diskseq; |
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}; |
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static inline bool disk_live(struct gendisk *disk) |
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{ |
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return !inode_unhashed(disk->part0->bd_inode); |
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} |
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/* |
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* The gendisk is refcounted by the part0 block_device, and the bd_device |
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* therein is also used for device model presentation in sysfs. |
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*/ |
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#define dev_to_disk(device) \ |
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(dev_to_bdev(device)->bd_disk) |
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#define disk_to_dev(disk) \ |
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(&((disk)->part0->bd_device)) |
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#if IS_REACHABLE(CONFIG_CDROM) |
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#define disk_to_cdi(disk) ((disk)->cdi) |
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#else |
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#define disk_to_cdi(disk) NULL |
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#endif |
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static inline dev_t disk_devt(struct gendisk *disk) |
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{ |
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return MKDEV(disk->major, disk->first_minor); |
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} |
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void disk_uevent(struct gendisk *disk, enum kobject_action action); |
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/* block/genhd.c */ |
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int __must_check device_add_disk(struct device *parent, struct gendisk *disk, |
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const struct attribute_group **groups); |
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static inline int __must_check add_disk(struct gendisk *disk) |
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{ |
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return device_add_disk(NULL, disk, NULL); |
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} |
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extern void del_gendisk(struct gendisk *gp); |
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void invalidate_disk(struct gendisk *disk); |
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void set_disk_ro(struct gendisk *disk, bool read_only); |
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static inline int get_disk_ro(struct gendisk *disk) |
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{ |
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return disk->part0->bd_read_only || |
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test_bit(GD_READ_ONLY, &disk->state); |
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} |
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static inline int bdev_read_only(struct block_device *bdev) |
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{ |
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return bdev->bd_read_only || get_disk_ro(bdev->bd_disk); |
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} |
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extern void disk_block_events(struct gendisk *disk); |
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extern void disk_unblock_events(struct gendisk *disk); |
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extern void disk_flush_events(struct gendisk *disk, unsigned int mask); |
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bool set_capacity_and_notify(struct gendisk *disk, sector_t size); |
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bool disk_force_media_change(struct gendisk *disk, unsigned int events); |
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/* drivers/char/random.c */ |
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extern void add_disk_randomness(struct gendisk *disk) __latent_entropy; |
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extern void rand_initialize_disk(struct gendisk *disk); |
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static inline sector_t get_start_sect(struct block_device *bdev) |
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{ |
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return bdev->bd_start_sect; |
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} |
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static inline sector_t bdev_nr_sectors(struct block_device *bdev) |
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{ |
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return bdev->bd_nr_sectors; |
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} |
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static inline loff_t bdev_nr_bytes(struct block_device *bdev) |
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{ |
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return (loff_t)bdev_nr_sectors(bdev) << SECTOR_SHIFT; |
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} |
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static inline sector_t get_capacity(struct gendisk *disk) |
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{ |
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return bdev_nr_sectors(disk->part0); |
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} |
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static inline u64 sb_bdev_nr_blocks(struct super_block *sb) |
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{ |
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return bdev_nr_sectors(sb->s_bdev) >> |
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(sb->s_blocksize_bits - SECTOR_SHIFT); |
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} |
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int bdev_disk_changed(struct gendisk *disk, bool invalidate); |
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void blk_drop_partitions(struct gendisk *disk); |
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struct gendisk *__alloc_disk_node(struct request_queue *q, int node_id, |
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struct lock_class_key *lkclass); |
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extern void put_disk(struct gendisk *disk); |
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struct gendisk *__blk_alloc_disk(int node, struct lock_class_key *lkclass); |
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/** |
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* blk_alloc_disk - allocate a gendisk structure |
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* @node_id: numa node to allocate on |
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* |
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* Allocate and pre-initialize a gendisk structure for use with BIO based |
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* drivers. |
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* |
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* Context: can sleep |
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*/ |
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#define blk_alloc_disk(node_id) \ |
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({ \ |
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static struct lock_class_key __key; \ |
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\ |
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__blk_alloc_disk(node_id, &__key); \ |
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}) |
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void blk_cleanup_disk(struct gendisk *disk); |
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int __register_blkdev(unsigned int major, const char *name, |
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void (*probe)(dev_t devt)); |
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#define register_blkdev(major, name) \ |
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__register_blkdev(major, name, NULL) |
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void unregister_blkdev(unsigned int major, const char *name); |
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bool bdev_check_media_change(struct block_device *bdev); |
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int __invalidate_device(struct block_device *bdev, bool kill_dirty); |
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void set_capacity(struct gendisk *disk, sector_t size); |
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#ifdef CONFIG_BLOCK_HOLDER_DEPRECATED |
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int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk); |
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void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk); |
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int bd_register_pending_holders(struct gendisk *disk); |
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#else |
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static inline int bd_link_disk_holder(struct block_device *bdev, |
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struct gendisk *disk) |
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{ |
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return 0; |
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} |
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static inline void bd_unlink_disk_holder(struct block_device *bdev, |
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struct gendisk *disk) |
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{ |
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} |
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static inline int bd_register_pending_holders(struct gendisk *disk) |
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{ |
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return 0; |
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} |
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#endif /* CONFIG_BLOCK_HOLDER_DEPRECATED */ |
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dev_t part_devt(struct gendisk *disk, u8 partno); |
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void inc_diskseq(struct gendisk *disk); |
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dev_t blk_lookup_devt(const char *name, int partno); |
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void blk_request_module(dev_t devt); |
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#ifdef CONFIG_BLOCK |
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void printk_all_partitions(void); |
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#else /* CONFIG_BLOCK */ |
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static inline void printk_all_partitions(void) |
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{ |
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} |
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#endif /* CONFIG_BLOCK */ |
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#endif /* _LINUX_GENHD_H */
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