diff mbox series

[v16,05/28] xfsprogs: Check for extent overflow when adding dir entries

Message ID 20210326003131.32642-6-allison.henderson@oracle.com (mailing list archive)
State New
Headers show
Series xfsprogs: Delay Ready Attributes | expand

Commit Message

Allison Henderson March 26, 2021, 12:31 a.m. UTC
From: Chandan Babu R <chandanrlinux@gmail.com>

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@gmail.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
---
 libxfs/xfs_inode_fork.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)
diff mbox series

Patch

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.
  */