From: Chandan Babu R <chandanrlinux@xxxxxxxxx>
Source kernel commit: f5d92749191402c50e32ac83dd9da3b910f5680f
Directory entry addition can cause the following,
1. Data block can be added/removed.
A new extent can cause extent count to increase by 1.
2. Free disk block can be added/removed.
Same behaviour as described above for Data block.
3. Dabtree blocks.
XFS_DA_NODE_MAXDEPTH blocks can be added. Each of these
can be new extents. Hence extent count can increase by
XFS_DA_NODE_MAXDEPTH.
Signed-off-by: Chandan Babu R <chandanrlinux@xxxxxxxxx>
Reviewed-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Signed-off-by: Allison Henderson <allison.henderson@xxxxxxxxxx>
---
libxfs/xfs_inode_fork.h | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/libxfs/xfs_inode_fork.h b/libxfs/xfs_inode_fork.h
index bcac769..ea1a9dd 100644
--- a/libxfs/xfs_inode_fork.h
+++ b/libxfs/xfs_inode_fork.h
@@ -48,6 +48,19 @@ struct xfs_ifork {
#define XFS_IEXT_PUNCH_HOLE_CNT (1)
/*
+ * Directory entry addition can cause the following,
+ * 1. Data block can be added/removed.
+ * A new extent can cause extent count to increase by 1.
+ * 2. Free disk block can be added/removed.
+ * Same behaviour as described above for Data block.
+ * 3. Dabtree blocks.
+ * XFS_DA_NODE_MAXDEPTH blocks can be added. Each of these can be new
+ * extents. Hence extent count can increase by XFS_DA_NODE_MAXDEPTH.
+ */
+#define XFS_IEXT_DIR_MANIP_CNT(mp) \
+ ((XFS_DA_NODE_MAXDEPTH + 1 + 1) * (mp)->m_dir_geo->fsbcount)
+
+/*
* Fork handling.
*/
--
2.7.4
