gfs2: Store qd_id in struct gfs2_quota_data as a struct kqid

- Change qd_id in struct gfs2_qutoa_data to struct kqid.
- Remove the now unnecessary QDF_USER bit field in qd_flags.
- Propopoage this change through the code generally making
  things simpler along the way.

Cc: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

fs/gfs2/incore.h

@@ -391,7 +391,6 @@ struct gfs2_revoke_replay {
 };
 
 enum {
-	QDF_USER		= 0,
 	QDF_CHANGE		= 1,
 	QDF_LOCKED		= 2,
 	QDF_REFRESH		= 3,
@@ -403,7 +402,7 @@ struct gfs2_quota_data {
 
 	atomic_t qd_count;
 
-	u32 qd_id;
+	struct kqid qd_id;
 	unsigned long qd_flags;		/* QDF_... */
 
 	s64 qd_change;