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block: split __blkdev_put 

Split __blkdev_put into one helper for the whole device, and one for
partitions as well as another shared helper for flushing the block
device inode mapping.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20210525061301.2242282-6-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2021-05-25 08:12:58 +02:00 committed by Jens Axboe
parent e54069acac
commit c8276b954d
1 changed files with 32 additions and 26 deletions
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58
fs/block_dev.c
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@ -1234,7 +1234,13 @@ void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk)
EXPORT_SYMBOL_GPL(bd_unlink_disk_holder);
#endif
static void __blkdev_put(struct block_device *bdev, fmode_t mode);
static void blkdev_flush_mapping(struct block_device *bdev)
{
WARN_ON_ONCE(bdev->bd_holders);
sync_blockdev(bdev);
kill_bdev(bdev);
bdev_write_inode(bdev);
}
int bdev_disk_changed(struct block_device *bdev, bool invalidate)
{
@ -1316,6 +1322,14 @@ static int blkdev_get_whole(struct block_device *bdev, fmode_t mode)
return 0;;
}
static void blkdev_put_whole(struct block_device *bdev, fmode_t mode)
{
if (!--bdev->bd_openers)
blkdev_flush_mapping(bdev);
if (bdev->bd_disk->fops->release)
bdev->bd_disk->fops->release(bdev->bd_disk, mode);
}
static int blkdev_get_part(struct block_device *part, fmode_t mode)
{
struct gendisk *disk = part->bd_disk;
@ -1343,12 +1357,24 @@ done:
return 0;
out_blkdev_put:
__blkdev_put(whole, mode);
blkdev_put_whole(whole, mode);
out_put_whole:
bdput(whole);
return ret;
}
static void blkdev_put_part(struct block_device *part, fmode_t mode)
{
struct block_device *whole = bdev_whole(part);
if (--part->bd_openers)
return;
blkdev_flush_mapping(part);
whole->bd_part_count--;
blkdev_put_whole(whole, mode);
bdput(whole);
}
struct block_device *blkdev_get_no_open(dev_t dev)
{
struct block_device *bdev;
@ -1542,29 +1568,6 @@ static int blkdev_open(struct inode * inode, struct file * filp)
return 0;
}
static void __blkdev_put(struct block_device *bdev, fmode_t mode)
{
struct gendisk *disk = bdev->bd_disk;
struct block_device *victim = NULL;
if (!--bdev->bd_openers) {
WARN_ON_ONCE(bdev->bd_holders);
sync_blockdev(bdev);
kill_bdev(bdev);
bdev_write_inode(bdev);
if (bdev_is_partition(bdev))
victim = bdev_whole(bdev);
}
if (!bdev_is_partition(bdev) && disk->fops->release)
disk->fops->release(disk, mode);
if (victim) {
victim->bd_part_count--;
__blkdev_put(victim, mode);
bdput(victim);
}
}
void blkdev_put(struct block_device *bdev, fmode_t mode)
{
struct gendisk *disk = bdev->bd_disk;
@ -1618,7 +1621,10 @@ void blkdev_put(struct block_device *bdev, fmode_t mode)
*/
disk_flush_events(disk, DISK_EVENT_MEDIA_CHANGE);
__blkdev_put(bdev, mode);
if (bdev_is_partition(bdev))
blkdev_put_part(bdev, mode);
else
blkdev_put_whole(bdev, mode);
mutex_unlock(&disk->open_mutex);
blkdev_put_no_open(bdev);