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 <[email protected]>

---
 fs/nfs/getroot.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

fs/nfs/getroot.c +2 -1

index 66984a9..b94f804 100644
@@ -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;

}