xfs: introduce XFS_SB_LOG_RES() for transactions that modify sb on disk

Introduce a new transaction space reservation XFS_SB_LOG_RES() for
those transactions that need to modify the superblock on disk.

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>

3 files changed, 14 insertions, 0 deletions

diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index b46009dc7b13..2e30a9a84f9f 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -45,6 +45,7 @@ typedef struct xfs_trans_reservations {
         uint    tr_qm_dqalloc;  /* allocate quota on disk */
         uint    tr_qm_quotaoff; /* turn quota off */
         uint    tr_qm_equotaoff;/* end of turn quota off */
+        uint    tr_sb;          /* modify superblock */
 } xfs_trans_reservations_t;
 
 #ifndef __KERNEL__
diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
index 84643fa5e465..72da2aa08421 100644
--- a/fs/xfs/xfs_trans.c
+++ b/fs/xfs/xfs_trans.c
@@ -606,6 +606,17 @@ xfs_calc_qm_quotaoff_end_reservation(
 }
 
 /*
+ * Syncing the incore super block changes to disk.
+ *     the super block to reflect the changes: sector size
+ */
+STATIC uint
+xfs_calc_sb_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.
  */
@@ -641,6 +652,7 @@ xfs_trans_init(
         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);
+        resp->tr_sb = xfs_calc_sb_reservation(mp);
 }
 
 /*
diff --git a/fs/xfs/xfs_trans.h b/fs/xfs/xfs_trans.h
index 57339e404cf6..d06919e28904 100644
--- a/fs/xfs/xfs_trans.h
+++ b/fs/xfs/xfs_trans.h
@@ -267,6 +267,7 @@ struct xfs_log_item_desc {
 #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)
 #define XFS_QM_QUOTAOFF_END_LOG_RES(mp) ((mp)->m_reservations.tr_qm_equotaoff)
+#define XFS_SB_LOG_RES(mp)              ((mp)->m_reservations.tr_sb)
 
 /*
  * Various log count values.