[patch 7/7] namei.c: update mnt when it is needed

[akpm@linux-foundation.org]

From: Huang Shijie <shijie8@gmail.com>

Update the mnt of the path when it is not equal to the new one.

Signed-off-by: Huang Shijie <shijie8@gmail.com>
Reviewed-by: WANG Cong <xiyou.wangcong@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/namei.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff -puN fs/namei.c~nameic-update-mnt-when-it-needed fs/namei.c
--- a/fs/namei.c~nameic-update-mnt-when-it-needed
+++ a/fs/namei.c
@@ -523,9 +523,10 @@ static void path_put_conditional(struct 
 static inline void path_to_nameidata(struct path *path, struct nameidata *nd)
 {
 	dput(nd->path.dentry);
-	if (nd->path.mnt != path->mnt)
+	if (nd->path.mnt != path->mnt) {
 		mntput(nd->path.mnt);
-	nd->path.mnt = path->mnt;
+		nd->path.mnt = path->mnt;
+	}
 	nd->path.dentry = path->dentry;
 }
 
_