diff options
| author | Chandan Babu R <chandan.babu@oracle.com> | 2022-03-29 06:14:00 +0000 |
|---|---|---|
| committer | Chandan Babu R <chandan.babu@oracle.com> | 2022-04-13 07:02:07 +0000 |
| commit | 83a21c18441f75aec64548692b52d34582b98a6a (patch) | |
| tree | d8163c99fb4ae8707be6cec9cf2211f00659a216 /fs/xfs/libxfs/xfs_dir2.c | |
| parent | 52a4a14842ef940e5bab1c949e5adc8f027327dc (diff) | |
xfs: Directory's data fork extent counter can never overflow
The maximum file size that can be represented by the data fork extent counter
in the worst case occurs when all extents are 1 block in length and each block
is 1KB in size.
With XFS_MAX_EXTCNT_DATA_FORK_SMALL representing maximum extent count and with
1KB sized blocks, a file can reach upto,
(2^31) * 1KB = 2TB
This is much larger than the theoretical maximum size of a directory
i.e. XFS_DIR2_SPACE_SIZE * 3 = ~96GB.
Since a directory's inode can never overflow its data fork extent counter,
this commit removes all the overflow checks associated with
it. xfs_dinode_verify() now performs a rough check to verify if a diretory's
data fork is larger than 96GB.
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandan.babu@oracle.com>
Diffstat (limited to 'fs/xfs/libxfs/xfs_dir2.c')
| -rw-r--r-- | fs/xfs/libxfs/xfs_dir2.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_dir2.c b/fs/xfs/libxfs/xfs_dir2.c index 5f1e4799e8fa..3cd51fa3837b 100644 --- a/fs/xfs/libxfs/xfs_dir2.c +++ b/fs/xfs/libxfs/xfs_dir2.c @@ -150,6 +150,8 @@ xfs_da_mount( dageo->freeblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_FREE_OFFSET); dageo->node_ents = (dageo->blksize - dageo->node_hdr_size) / (uint)sizeof(xfs_da_node_entry_t); + dageo->max_extents = (XFS_DIR2_MAX_SPACES * XFS_DIR2_SPACE_SIZE) >> + mp->m_sb.sb_blocklog; dageo->magicpct = (dageo->blksize * 37) / 100; /* set up attribute geometry - single fsb only */ @@ -161,6 +163,12 @@ xfs_da_mount( dageo->node_hdr_size = mp->m_dir_geo->node_hdr_size; dageo->node_ents = (dageo->blksize - dageo->node_hdr_size) / (uint)sizeof(xfs_da_node_entry_t); + + if (xfs_has_large_extent_counts(mp)) + dageo->max_extents = XFS_MAX_EXTCNT_ATTR_FORK_LARGE; + else + dageo->max_extents = XFS_MAX_EXTCNT_ATTR_FORK_SMALL; + dageo->magicpct = (dageo->blksize * 37) / 100; return 0; } |