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btrfs: fix missing semaphore unlock in btrfs_sync_file 

Ordered ops are started twice in sync file, once outside of inode mutex
and once inside, taking the dio semaphore. There was one error path
missing the semaphore unlock.

Fixes: aab15e8ec2 ("Btrfs: fix rare chances for data loss when doing a fast fsync")
CC: stable@vger.kernel.org # 4.19+
Signed-off-by: Robbie Ko <robbieko@synology.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
[ add changelog ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Robbie Ko 2020-03-17 14:31:02 +08:00 committed by David Sterba
parent 351cbf6e44
commit 6ff06729c2
1 changed files with 1 additions and 0 deletions
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1
fs/btrfs/file.c
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@ -2117,6 +2117,7 @@ int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
*/
ret = start_ordered_ops(inode, start, end);
if (ret) {
up_write(&BTRFS_I(inode)->dio_sem);
inode_unlock(inode);
goto out;
}