diff options
| -rw-r--r-- | fs/xfs/xfs_reflink.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index 35a17ca5b508..0a3681646fc9 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -1035,6 +1035,22 @@ xfs_reflink_remap_extent( trace_xfs_reflink_remap_extent_dest(ip, &smap); + /* + * Two extents mapped to the same physical block must not have + * different states; that's filesystem corruption. Move on to the next + * extent if they're both holes or both the same physical extent. + */ + if (dmap->br_startblock == smap.br_startblock) { + if (dmap->br_state != smap.br_state) + error = -EFSCORRUPTED; + goto out_cancel; + } + + /* If both extents are unwritten, leave them alone. */ + if (dmap->br_state == XFS_EXT_UNWRITTEN && + smap.br_state == XFS_EXT_UNWRITTEN) + goto out_cancel; + /* No reflinking if the AG of the dest mapping is low on space. */ if (dmap_written) { error = xfs_reflink_ag_has_free_space(mp, |