3.11.10.15 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Vasily Averin <vvs@xxxxxxxxxxxxx>
commit 295dc39d941dc2ae53d5c170365af4c9d5c16212 upstream.
Currently umount on symlink blocks following umount:
/vz is separate mount
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: /vz/testlink: not mounted (expected)
umount: /vz: device is busy. (unexpected)
In this case mountpoint_last() gets an extra refcount on path->mnt
Signed-off-by: Vasily Averin <vvs@xxxxxxxxxx>
Acked-by: Ian Kent <raven@xxxxxxxxxx>
Acked-by: Jeff Layton <jlayton@xxxxxxxxxxxxxxx>
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Cc: Neil Brown <neilb@xxxxxxx>
[ luis: backported to 3.11: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
fs/namei.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/namei.c b/fs/namei.c
index a10bd2f8b66b..2d36c4651627 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2260,10 +2260,11 @@ error_check:
dput(dentry);
} else {
path->dentry = dentry;
- path->mnt = mntget(nd->path.mnt);
+ path->mnt = nd->path.mnt;
if (should_follow_link(dentry->d_inode,
nd->flags & LOOKUP_FOLLOW))
return 1;
+ mntget(path->mnt);
follow_mount(path);
}
}
--
1.9.1
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