xfs: Replace macro XFS_DQ_TO_QIP with a function

In preparation for combined pquota/gquota support, for the sake
of readability, change the macro to an inline function.
Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Reviewed-by: Ben Myers <bpm@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

fs/xfs/xfs_dquot.c

@@ -573,7 +573,7 @@ xfs_qm_dqtobp(
 	xfs_bmbt_irec_t map;
 	int		nmaps = 1, error;
 	xfs_buf_t	*bp;
-	xfs_inode_t	*quotip = XFS_DQ_TO_QIP(dqp);
+	struct xfs_inode	*quotip = xfs_dq_to_quota_inode(dqp);
 	xfs_mount_t	*mp = dqp->q_mount;
 	xfs_dqid_t	id = be32_to_cpu(dqp->q_core.d_id);
 	xfs_trans_t	*tp = (tpp ? *tpp : NULL);

fs/xfs/xfs_dquot.h

@@ -143,10 +143,6 @@ static inline xfs_dquot_t *xfs_inode_dquot(struct xfs_inode *ip, int type)
 #define XFS_QM_ISUDQ(dqp)	((dqp)->dq_flags & XFS_DQ_USER)
 #define XFS_QM_ISPDQ(dqp)	((dqp)->dq_flags & XFS_DQ_PROJ)
 #define XFS_QM_ISGDQ(dqp)	((dqp)->dq_flags & XFS_DQ_GROUP)
-#define XFS_DQ_TO_QINF(dqp)	((dqp)->q_mount->m_quotainfo)
-#define XFS_DQ_TO_QIP(dqp)	(XFS_QM_ISUDQ(dqp) ? \
-				 XFS_DQ_TO_QINF(dqp)->qi_uquotaip : \
-				 XFS_DQ_TO_QINF(dqp)->qi_gquotaip)
 
 extern int		xfs_qm_dqread(struct xfs_mount *, xfs_dqid_t, uint,
 					uint, struct xfs_dquot	**);

fs/xfs/xfs_qm.h

@@ -85,6 +85,22 @@ xfs_dquot_tree(
 	}
 	return NULL;
 }
+
+static inline struct xfs_inode *
+xfs_dq_to_quota_inode(struct xfs_dquot *dqp)
+{
+	switch (dqp->dq_flags & XFS_DQ_ALLTYPES) {
+	case XFS_DQ_USER:
+		return dqp->q_mount->m_quotainfo->qi_uquotaip;
+	case XFS_DQ_GROUP:
+	case XFS_DQ_PROJ:
+		return dqp->q_mount->m_quotainfo->qi_gquotaip;
+	default:
+		ASSERT(0);
+	}
+	return NULL;
+}
+
 extern int	xfs_qm_calc_dquots_per_chunk(struct xfs_mount *mp,
 					     unsigned int nbblks);
 extern void	xfs_trans_mod_dquot(xfs_trans_t *, xfs_dquot_t *, uint, long);