xfs: calculate XFS_TRANS_QM_DQALLOC space log reservation at mount time

The disk quota allocation log space reservation is calcuated at runtime,
this patch does it at mount time.
Signed-off-by: Jie Liu <jeff.liu@oracle.com>
CC: Dave Chinner <david@fromorbit.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

fs/xfs/xfs_dquot.c

@@ -612,15 +612,9 @@ xfs_qm_dqread(
 	if (flags & XFS_QMOPT_DQALLOC) {
 		tp = xfs_trans_alloc(mp, XFS_TRANS_QM_DQALLOC);
 		error = xfs_trans_reserve(tp, XFS_QM_DQALLOC_SPACE_RES(mp),
-				XFS_WRITE_LOG_RES(mp) +
-				/*
-				 * Round the chunklen up to the next multiple
-				 * of 128 (buf log item chunk size)).
-				 */
-				BBTOB(mp->m_quotainfo->qi_dqchunklen) - 1 + 128,
-				0,
-				XFS_TRANS_PERM_LOG_RES,
-				XFS_WRITE_LOG_COUNT);
+					  XFS_QM_DQALLOC_LOG_RES(mp), 0,
+					  XFS_TRANS_PERM_LOG_RES,
+					  XFS_WRITE_LOG_COUNT);
 		if (error)
 			goto error1;
 		cancelflags = XFS_TRANS_RELEASE_LOG_RES;

fs/xfs/xfs_mount.h

@@ -42,6 +42,7 @@ typedef struct xfs_trans_reservations {
 	uint	tr_growrtfree;	/* grow realtime freeing */
 	uint	tr_qm_sbchange;	/* change quota flags */
 	uint	tr_qm_setqlim;	/* adjust quota limits */
+	uint	tr_qm_dqalloc;	/* allocate quota on disk */
 } xfs_trans_reservations_t;
 
 #ifndef __KERNEL__

fs/xfs/xfs_trans.c

@@ -567,6 +567,20 @@ xfs_calc_qm_setqlim_reservation(
 	return xfs_calc_buf_res(1, sizeof(struct xfs_disk_dquot));
 }
 
+/*
+ * Allocating quota on disk if needed.
+ *	the write transaction log space: XFS_WRITE_LOG_RES(mp)
+ *	the unit of quota allocation: one system block size
+ */
+STATIC uint
+xfs_calc_qm_dqalloc_reservation(
+	struct xfs_mount	*mp)
+{
+	return XFS_WRITE_LOG_RES(mp) +
+		xfs_calc_buf_res(1,
+			XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB) - 1);
+}
+
 /*
  * Initialize the precomputed transaction reservation values
  * in the mount structure.
@@ -600,6 +614,7 @@ xfs_trans_init(
 	resp->tr_growrtfree = xfs_calc_growrtfree_reservation(mp);
 	resp->tr_qm_sbchange = xfs_calc_qm_sbchange_reservation(mp);
 	resp->tr_qm_setqlim = xfs_calc_qm_setqlim_reservation(mp);
+	resp->tr_qm_dqalloc = xfs_calc_qm_dqalloc_reservation(mp);
 }
 
 /*

fs/xfs/xfs_trans.h

@@ -264,6 +264,7 @@ struct xfs_log_item_desc {
 #define	XFS_CLEAR_AGI_BUCKET_LOG_RES(mp)  ((mp)->m_reservations.tr_clearagi)
 #define XFS_QM_SBCHANGE_LOG_RES(mp)	((mp)->m_reservations.tr_qm_sbchange)
 #define XFS_QM_SETQLIM_LOG_RES(mp)	((mp)->m_reservations.tr_qm_setqlim)
+#define XFS_QM_DQALLOC_LOG_RES(mp)	((mp)->m_reservations.tr_qm_dqalloc)
 
 /*
  * Various log count values.