From: Kinglong Mee <kinglongmee@gmail.com>
Date: Tue, 15 Apr 2014 09:22:59 +0000 (+0800)
Subject: NFS: Fix memroy leak for double mounts
X-Git-Tag: next-20140428~62^2~2
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=4dfc7fdb9e261d77818616782ae1841a80e0fc83;p=karo-tx-linux.git

NFS: Fix memroy leak for double mounts

When double mounting same nfs filesystem, the devname saved in d_fsdata
will be lost.The second mount should not change the devname that
be saved in d_fsdata.

Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
---

diff --git a/fs/nfs/getroot.c b/fs/nfs/getroot.c
index 66984a9aafaa..b94f80420a58 100644
--- a/fs/nfs/getroot.c
+++ b/fs/nfs/getroot.c
@@ -120,7 +120,8 @@ struct dentry *nfs_get_root(struct super_block *sb, struct nfs_fh *mntfh,
 
 	security_d_instantiate(ret, inode);
 	spin_lock(&ret->d_lock);
-	if (IS_ROOT(ret) && !(ret->d_flags & DCACHE_NFSFS_RENAMED)) {
+	if (IS_ROOT(ret) && !ret->d_fsdata &&
+	    !(ret->d_flags & DCACHE_NFSFS_RENAMED)) {
 		ret->d_fsdata = name;
 		name = NULL;
 	}