xfs: calculate XFS_TRANS_QM_QUOTAOFF_END space log reservation at mount time

Convert the calculation for end of quotaoff log space reservation
from runtime to 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>

diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
index a557c82..84643fa 100644
--- a/fs/xfs/xfs_trans.c
+++ b/fs/xfs/xfs_trans.c
@@ -595,6 +595,17 @@
 }
 
 /*
+ * End of turning off quotas.
+ *    the xfs_qoff_logitem_t: sizeof(struct xfs_qoff_logitem) * 2
+ */
+STATIC uint
+xfs_calc_qm_quotaoff_end_reservation(
+	struct xfs_mount	*mp)
+{
+	return sizeof(struct xfs_qoff_logitem) * 2;
+}
+
+/*
  * Initialize the precomputed transaction reservation values
  * in the mount structure.
  */
@@ -629,6 +640,7 @@
 	resp->tr_qm_setqlim = xfs_calc_qm_setqlim_reservation(mp);
 	resp->tr_qm_dqalloc = xfs_calc_qm_dqalloc_reservation(mp);
 	resp->tr_qm_quotaoff = xfs_calc_qm_quotaoff_reservation(mp);
+	resp->tr_qm_equotaoff = xfs_calc_qm_quotaoff_end_reservation(mp);
 }
 
 /*