ocfs2: ignore NULL vfsmnt in ocfs2_should_update_atime()

This can come from NFSD.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index a50447d461e5..10953a508f2f 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -149,6 +149,17 @@ int ocfs2_should_update_atime(struct inode *inode,
             ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode)))
                 return 0;
 
+        /*
+         * We can be called with no vfsmnt structure - NFSD will
+         * sometimes do this.
+         *
+         * Note that our action here is different than touch_atime() -
+         * if we can't tell whether this is a noatime mount, then we
+         * don't know whether to trust the value of s_atime_quantum.
+         */
+        if (vfsmnt == NULL)
+                return 0;
+
         if ((vfsmnt->mnt_flags & MNT_NOATIME) ||
             ((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
                 return 0;