3.13.11.6 -stable review patch. If anyone has any objections, please let me
know.
------------------
From: Vasily Averin <v...@parallels.com>
commit 295dc39d941dc2ae53d5c170365af4c9d5c16212 upstream.
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: Vasily Averin <v...@openvz.org>
Acked-by: Ian Kent <ra...@themaw.net>
Acked-by: Jeff Layton <jlay...@primarydata.com>
Signed-off-by: Christoph Hellwig <h...@lst.de>
Signed-off-by: Kamal Mostafa <ka...@canonical.com>
---
fs/namei.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/namei.c b/fs/namei.c
index 01aca74..31673f4 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2236,9 +2236,10 @@ done:
goto out;
}
path->dentry = dentry;
- path->mnt = mntget(nd->path.mnt);
+ path->mnt = nd->path.mnt;
if (should_follow_link(dentry, nd->flags & LOOKUP_FOLLOW))
return 1;
+ mntget(path->mnt);
follow_mount(path);
error = 0;
out:
--
1.9.1
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