diff options
| author | Chandan Babu R <chandanrlinux@gmail.com> | 2021-01-23 03:48:12 +0300 |
|---|---|---|
| committer | Darrick J. Wong <djwong@kernel.org> | 2021-01-23 03:54:47 +0300 |
| commit | f5d92749191402c50e32ac83dd9da3b910f5680f (patch) | |
| tree | 7c74e4d26fc97b7890af4f35302fbbfd8fd4fea6 /fs/xfs/libxfs/xfs_inode_fork.h | |
| parent | 85ef08b5a667615bc7be5058259753dc42a7adcd (diff) | |
| download | linux-f5d92749191402c50e32ac83dd9da3b910f5680f.tar.xz | |
xfs: Check for extent overflow when adding dir entries
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>
Diffstat (limited to 'fs/xfs/libxfs/xfs_inode_fork.h')
| -rw-r--r-- | fs/xfs/libxfs/xfs_inode_fork.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_inode_fork.h b/fs/xfs/libxfs/xfs_inode_fork.h index bcac769a7df6..ea1a9dd8a763 100644 --- a/fs/xfs/libxfs/xfs_inode_fork.h +++ b/fs/xfs/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. */ |