xfs: calculate XFS_TRANS_QM_QUOTAOFF space log reservation at mount time

Convert the calculation of quota off transaction 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>

4 files changed, 19 insertions, 7 deletions

diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index fc500c6c8800..4f5e148ffd1c 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -43,6 +43,7 @@ typedef struct xfs_trans_reservations {
         uint    tr_qm_sbchange; /* change quota flags */
         uint    tr_qm_setqlim;  /* adjust quota limits */
         uint    tr_qm_dqalloc;  /* allocate quota on disk */
+        uint    tr_qm_quotaoff; /* turn quota off */
 } xfs_trans_reservations_t;
 
 #ifndef __KERNEL__
diff --git a/fs/xfs/xfs_qm_syscalls.c b/fs/xfs/xfs_qm_syscalls.c
index 1476b6fd4ed5..4605f8914cb4 100644
--- a/fs/xfs/xfs_qm_syscalls.c
+++ b/fs/xfs/xfs_qm_syscalls.c
@@ -672,14 +672,10 @@ xfs_qm_log_quotaoff(
         uint                    oldsbqflag=0;
 
         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QUOTAOFF);
-        if ((error = xfs_trans_reserve(tp, 0,
-                                      sizeof(xfs_qoff_logitem_t) * 2 +
-                                      mp->m_sb.sb_sectsize + 128,
-                                      0,
-                                      0,
-                                      XFS_DEFAULT_LOG_COUNT))) {
+        error = xfs_trans_reserve(tp, 0, XFS_QM_QUOTAOFF_LOG_RES(mp),
+                                  0, 0, XFS_DEFAULT_LOG_COUNT);
+        if (error)
                 goto error0;
-        }
 
         qoffi = xfs_trans_get_qoff_item(tp, NULL, flags & XFS_ALL_QUOTA_ACCT);
         xfs_trans_log_quotaoff_item(tp, qoffi);
diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
index 6dd2c043efcd..a557c82e58f0 100644
--- a/fs/xfs/xfs_trans.c
+++ b/fs/xfs/xfs_trans.c
@@ -582,6 +582,19 @@ xfs_calc_qm_dqalloc_reservation(
 }
 
 /*
+ * Turning off quotas.
+ *    the xfs_qoff_logitem_t: sizeof(struct xfs_qoff_logitem) * 2
+ *    the superblock for the quota flags: sector size
+ */
+STATIC uint
+xfs_calc_qm_quotaoff_reservation(
+        struct xfs_mount        *mp)
+{
+        return sizeof(struct xfs_qoff_logitem) * 2 +
+                xfs_calc_buf_res(1, mp->m_sb.sb_sectsize);
+}
+
+/*
  * Initialize the precomputed transaction reservation values
  * in the mount structure.
  */
@@ -615,6 +628,7 @@ xfs_trans_init(
         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);
+        resp->tr_qm_quotaoff = xfs_calc_qm_quotaoff_reservation(mp);
 }
 
 /*
diff --git a/fs/xfs/xfs_trans.h b/fs/xfs/xfs_trans.h
index 04575db806d4..1e103dad17d1 100644
--- a/fs/xfs/xfs_trans.h
+++ b/fs/xfs/xfs_trans.h
@@ -265,6 +265,7 @@ struct xfs_log_item_desc {
 #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)
+#define XFS_QM_QUOTAOFF_LOG_RES(mp)     ((mp)->m_reservations.tr_qm_quotaoff)
 
 /*
  * Various log count values.