xfs: Remove incore use of XFS_OQUOTA_ENFD and XFS_OQUOTA_CHKD

Remove all incore use of XFS_OQUOTA_ENFD and XFS_OQUOTA_CHKD. Instead,
start using XFS_GQUOTA_.* XFS_PQUOTA_.* counterparts for GQUOTA and
PQUOTA respectively.

On-disk copy still uses XFS_OQUOTA_ENFD and XFS_OQUOTA_CHKD.

Read and write of the superblock does the conversion from *OQUOTA*
to *[PG]QUOTA*.

Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Reviewed-by: Ben Myers <bpm@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

diff --git a/fs/xfs/xfs_trans_dquot.c b/fs/xfs/xfs_trans_dquot.c
index 7ea7485..3ba64d5 100644
--- a/fs/xfs/xfs_trans_dquot.c
+++ b/fs/xfs/xfs_trans_dquot.c
@@ -632,8 +632,8 @@
 	if ((flags & XFS_QMOPT_FORCE_RES) == 0 &&
 	    dqp->q_core.d_id &&
 	    ((XFS_IS_UQUOTA_ENFORCED(dqp->q_mount) && XFS_QM_ISUDQ(dqp)) ||
-	     (XFS_IS_OQUOTA_ENFORCED(dqp->q_mount) &&
-	      (XFS_QM_ISPDQ(dqp) || XFS_QM_ISGDQ(dqp))))) {
+	     (XFS_IS_GQUOTA_ENFORCED(dqp->q_mount) && XFS_QM_ISGDQ(dqp)) ||
+	     (XFS_IS_PQUOTA_ENFORCED(dqp->q_mount) && XFS_QM_ISPDQ(dqp)))) {
 		if (nblks > 0) {
 			/*
 			 * dquot is locked already. See if we'd go over the