[GFS2] Fix recursive locking in gfs2_getattr

The readdirplus NFS operation can result in gfs2_getattr being
called with the glock already held. In this case we do not want
to try and grab the lock again.

This fixes Red Hat bugzilla #215727

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

1 files changed, 17 insertions, 5 deletions

diff --git a/fs/gfs2/ops_inode.c b/fs/gfs2/ops_inode.c
index fd9fee2ceeac..fbe38c1ab54e 100644
--- a/fs/gfs2/ops_inode.c
+++ b/fs/gfs2/ops_inode.c
@@ -992,6 +992,12 @@ out:
  * @dentry: The dentry to stat
  * @stat: The inode's stats
  *
+ * This may be called from the VFS directly, or from within GFS2 with the
+ * inode locked, so we look to see if the glock is already locked and only
+ * lock the glock if its not already been done. Note that its the NFS
+ * readdirplus operation which causes this to be called (from filldir)
+ * with the glock already held.
+ *
  * Returns: errno
  */
 
@@ -1002,14 +1008,20 @@ static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
         struct gfs2_inode *ip = GFS2_I(inode);
         struct gfs2_holder gh;
         int error;
+        int unlock = 0;
 
-        error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
-        if (!error) {
-                generic_fillattr(inode, stat);
-                gfs2_glock_dq_uninit(&gh);
+        if (gfs2_glock_is_locked_by_me(ip->i_gl) == 0) {
+                error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
+                if (error)
+                        return error;
+                unlock = 1;
         }
 
-        return error;
+        generic_fillattr(inode, stat);
+        if (unlock);
+                gfs2_glock_dq_uninit(&gh);
+
+        return 0;
 }
 
 static int gfs2_setxattr(struct dentry *dentry, const char *name,