fix xfs_copy betwen devices with mismatching sizes

Christoph Hellwig <[email protected]> Wed, 29 Jul 2026 14:51:32 +0200
Newsgroups org.kernel.vger.linux-xfs
Message-ID <[email protected]>
This fixes copy between devices with different alignment requirements.
xfs/601 trigges this when TEST_DIR is on a device that requires minimal
alignment, but SCRATCH_DEV is on a device that requires more alignment.