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block: Add invalidate_disk() helper to invalidate the gendisk

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To hide internal implementation and simplify some driver code,
this adds a helper to invalidate the gendisk. It will clean the
gendisk's associated buffer/page caches and reset its internal
states.

Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210922123711.187-2-xieyongji@bytedance.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Xie Yongji 2021-09-22 20:37:08 +08:00 committed by Jens Axboe
parent e94f68527a
commit f059a1d2e2
2 changed files with 22 additions and 0 deletions
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20
block/genhd.c
View file

@ -624,6 +624,26 @@ void del_gendisk(struct gendisk *disk)
}
EXPORT_SYMBOL(del_gendisk);
/**
* invalidate_disk - invalidate the disk
* @disk: the struct gendisk to invalidate
*
* A helper to invalidates the disk. It will clean the disk's associated
* buffer/page caches and reset its internal states so that the disk
* can be reused by the drivers.
*
* Context: can sleep
*/
void invalidate_disk(struct gendisk *disk)
{
struct block_device *bdev = disk->part0;
invalidate_bdev(bdev);
bdev->bd_inode->i_mapping->wb_err = 0;
set_capacity(disk, 0);
}
EXPORT_SYMBOL(invalidate_disk);
/* sysfs access to bad-blocks list. */
static ssize_t disk_badblocks_show(struct device *dev,
struct device_attribute *attr,

2
include/linux/genhd.h
View file

@ -213,6 +213,8 @@ static inline int add_disk(struct gendisk *disk)
}
extern void del_gendisk(struct gendisk *gp);
void invalidate_disk(struct gendisk *disk);
void set_disk_ro(struct gendisk *disk, bool read_only);
static inline int get_disk_ro(struct gendisk *disk)