xfs: calculate XFS_TRANS_QM_SBCHANGE space log reservation at mount time

The transaction log space for clearing/reseting the quota flags
is calculated out at runtime, this patch can figure it out 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>

4 files changed, 16 insertions, 3 deletions

diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 7d6df7c00c36..0db40205778a 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -1109,8 +1109,8 @@ xfs_mount_reset_sbqflags(
                 return 0;
 
         tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE);
-        error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0,
-                                      XFS_DEFAULT_LOG_COUNT);
+        error = xfs_trans_reserve(tp, 0, XFS_QM_SBCHANGE_LOG_RES(mp),
+                                  0, 0, XFS_DEFAULT_LOG_COUNT);
         if (error) {
                 xfs_trans_cancel(tp, 0);
                 xfs_alert(mp, "%s: Superblock update failed!", __func__);
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index bab8314507e4..4e9aa9524840 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -40,6 +40,7 @@ typedef struct xfs_trans_reservations {
         uint    tr_growrtalloc; /* grow realtime allocations */
         uint    tr_growrtzero;  /* grow realtime zeroing */
         uint    tr_growrtfree;  /* grow realtime freeing */
+        uint    tr_qm_sbchange; /* change quota flags */
 } xfs_trans_reservations_t;
 
 #ifndef __KERNEL__
diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
index a81625c75a91..6ba62c0e24d1 100644
--- a/fs/xfs/xfs_trans.c
+++ b/fs/xfs/xfs_trans.c
@@ -546,6 +546,17 @@ xfs_calc_clear_agi_bucket_reservation(
 }
 
 /*
+ * Clearing the quotaflags in the superblock.
+ *      the super block for changing quota flags: sector size
+ */
+STATIC uint
+xfs_calc_qm_sbchange_reservation(
+        struct xfs_mount        *mp)
+{
+        return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize);
+}
+
+/*
  * Initialize the precomputed transaction reservation values
  * in the mount structure.
  */
@@ -576,6 +587,7 @@ xfs_trans_init(
         resp->tr_growrtalloc = xfs_calc_growrtalloc_reservation(mp);
         resp->tr_growrtzero = xfs_calc_growrtzero_reservation(mp);
         resp->tr_growrtfree = xfs_calc_growrtfree_reservation(mp);
+        resp->tr_qm_sbchange = xfs_calc_qm_sbchange_reservation(mp);
 }
 
 /*
diff --git a/fs/xfs/xfs_trans.h b/fs/xfs/xfs_trans.h
index c6c0601abd7a..a690f2803594 100644
--- a/fs/xfs/xfs_trans.h
+++ b/fs/xfs/xfs_trans.h
@@ -262,7 +262,7 @@ struct xfs_log_item_desc {
          (128 * (ext + (ext * XFS_BM_MAXLEVELS(mp, XFS_ATTR_FORK)))))
 #define XFS_ATTRRM_LOG_RES(mp)  ((mp)->m_reservations.tr_attrrm)
 #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)
 
 /*
  * Various log count values.