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| author | Darrick J. Wong <darrick.wong@oracle.com> | 2018-06-21 23:26:57 -0700 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2018-06-24 11:56:36 -0700 |
| commit | f62cb48e43195f66c7a40bbfcf11531fc1ff8999 (patch) | |
| tree | 0239274fdf66eac61e3d914c21d9081ca66302c8 /fs/xfs/libxfs/xfs_bmap.h | |
| parent | aafe12cee0b132824f5187987f8a3fb704b9f685 (diff) | |
| download | linux-f62cb48e43195f66c7a40bbfcf11531fc1ff8999.tar.bz2 | |
xfs: don't allow insert-range to shift extents past the maximum offset
Zorro Lang reports that generic/485 blows an assert on a filesystem with
512 byte blocks. The test tries to fallocate a post-eof extent at the
maximum file size and calls insert range to shift the extents right by
two blocks. On a 512b block filesystem this causes startoff to overflow
the 54-bit startoff field, leading to the assert.
Therefore, always check the rightmost extent to see if it would overflow
prior to invoking the insert range machinery.
Reported-by: zlang@redhat.com
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=200137
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/xfs/libxfs/xfs_bmap.h')
| -rw-r--r-- | fs/xfs/libxfs/xfs_bmap.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h index 99dddbd0fcc6..9b49ddf99c41 100644 --- a/fs/xfs/libxfs/xfs_bmap.h +++ b/fs/xfs/libxfs/xfs_bmap.h @@ -227,6 +227,8 @@ int xfs_bmap_collapse_extents(struct xfs_trans *tp, struct xfs_inode *ip, xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb, bool *done, xfs_fsblock_t *firstblock, struct xfs_defer_ops *dfops); +int xfs_bmap_can_insert_extents(struct xfs_inode *ip, xfs_fileoff_t off, + xfs_fileoff_t shift); int xfs_bmap_insert_extents(struct xfs_trans *tp, struct xfs_inode *ip, xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb, bool *done, xfs_fileoff_t stop_fsb, xfs_fsblock_t *firstblock, |