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| author | Chandan Babu R <chandanrlinux@gmail.com> | 2021-01-23 03:48:11 +0300 |
|---|---|---|
| committer | Darrick J. Wong <djwong@kernel.org> | 2021-01-23 03:54:47 +0300 |
| commit | 727e1acd297cae15449607d6e2ee39c71216cf1a (patch) | |
| tree | 3057407785005630e7d01a6a6ed491a5c31fdde8 /fs/xfs/libxfs | |
| parent | b9b7e1dc56c5ca8d6fc37c410b054e9f26737d2e (diff) | |
| download | linux-727e1acd297cae15449607d6e2ee39c71216cf1a.tar.xz | |
xfs: Check for extent overflow when trivally adding a new extent
When adding a new data extent (without modifying an inode's existing
extents) the extent count increases only by 1. This commit checks for
extent count overflow in such cases.
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
Signed-off-by: Chandan Babu R <chandanrlinux@gmail.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Diffstat (limited to 'fs/xfs/libxfs')
| -rw-r--r-- | fs/xfs/libxfs/xfs_bmap.c | 6 | ||||
| -rw-r--r-- | fs/xfs/libxfs/xfs_inode_fork.h | 6 |
2 files changed, 12 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index bc446418e227..32aeacf6f055 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -4527,6 +4527,12 @@ xfs_bmapi_convert_delalloc( return error; xfs_ilock(ip, XFS_ILOCK_EXCL); + + error = xfs_iext_count_may_overflow(ip, whichfork, + XFS_IEXT_ADD_NOSPLIT_CNT); + if (error) + goto out_trans_cancel; + xfs_trans_ijoin(tp, ip, 0); if (!xfs_iext_lookup_extent(ip, ifp, offset_fsb, &bma.icur, &bma.got) || diff --git a/fs/xfs/libxfs/xfs_inode_fork.h b/fs/xfs/libxfs/xfs_inode_fork.h index 0beb8e2a00be..7fc2b129a2e7 100644 --- a/fs/xfs/libxfs/xfs_inode_fork.h +++ b/fs/xfs/libxfs/xfs_inode_fork.h @@ -35,6 +35,12 @@ struct xfs_ifork { #define XFS_IFBROOT 0x04 /* i_broot points to the bmap b-tree root */ /* + * Worst-case increase in the fork extent count when we're adding a single + * extent to a fork and there's no possibility of splitting an existing mapping. + */ +#define XFS_IEXT_ADD_NOSPLIT_CNT (1) + +/* * Fork handling. */ |