[PATCH v4 03/13] xfs: calculate XFS_TRANS_QM_SBCHANGE space log reservation at mount time

[Jeff Liu <jeff.liu@xxxxxxxxxx>]

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@xxxxxxxxxx>
CC: Dave Chinner <david@xxxxxxxxxxxxx>
Reviewed-by: Mark Tinguely <tinguely@xxxxxxx>
---
 fs/xfs/xfs_mount.c |    4 ++--
 fs/xfs/xfs_mount.h |    1 +
 fs/xfs/xfs_trans.c |   12 ++++++++++++
 fs/xfs/xfs_trans.h |    2 +-
 4 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index b2bd3a0..b39fa96 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -1056,8 +1056,8 @@ 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 deee09e..9e3a03b 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 1fc2877..236e53e 100644
--- a/fs/xfs/xfs_trans.c
+++ b/fs/xfs/xfs_trans.c
@@ -545,6 +545,17 @@ 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.
  */
@@ -575,6 +586,7 @@ 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 db05654..4eb1140 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.
-- 
1.7.9.5