fs: umount on symlink leaks mnt count
Currently umount on symlink blocks following umount: /vz is separate mount # ls /vz/ -al | grep test drwxr-xr-x. 2 root root 4096 Jul 19 01:14 testdir lrwxrwxrwx. 1 root root 11 Jul 19 01:16 testlink -> /vz/testdir # umount -l /vz/testlink umount: /vz/testlink: not mounted (expected) # lsof /vz # umount /vz umount: /vz: device is busy. (unexpected) In this case mountpoint_last() gets an extra refcount on path->mnt Signed-off-by: NVasily Averin <vvs@openvz.org> Acked-by: NIan Kent <raven@themaw.net> Acked-by: NJeff Layton <jlayton@primarydata.com> Cc: stable@vger.kernel.org Signed-off-by: NChristoph Hellwig <hch@lst.de>
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