GFS2: Fix ref count bug relating to atomic_open

In the case that atomic_open calls finish_no_open() with
the dentry that was supplied to gfs2_atomic_open() an
extra reference count is required. This patch fixes that
issue preventing a bug trap triggering at umount time.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 1615df16cf4e..7119504159f1 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -1171,8 +1171,11 @@ static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
         if (d != NULL)
                 dentry = d;
         if (dentry->d_inode) {
-                if (!(*opened & FILE_OPENED))
+                if (!(*opened & FILE_OPENED)) {
+                        if (d == NULL)
+                                dget(dentry);
                         return finish_no_open(file, dentry);
+                }
                 dput(d);
                 return 0;
         }