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) Looks like an extra refcount on mnt was taken in mountpoint_last() Patch below fixes the problem on my test node. Signed-off-by: Vasily Averin <vvs@xxxxxxxxxx>
diff --git a/fs/namei.c b/fs/namei.c index 985c6f3..0d32a0f 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -2305,6 +2305,7 @@ path_mountpoint(int dfd, const char *name, struct path *path, unsigned int flags break; err = mountpoint_last(&nd, path); put_link(&nd, &link, cookie); + mntput(link.mnt); } out: if (base)
