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Make it easier to simulate various unusual hardware setups (for example, recent commits3482b9bandb8d0a98affect the Dell Equallogic iSCSI with its 15M preferred and maximum unmap and write zero sizing, orb2f95fedeals with the Linux loopback block device having a max_transfer of 64k), by allowing blkdebug to wrap any other device with further restrictions on various alignments. Signed-off-by: Eric Blake <eblake@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Message-id: 20170429191419.30051-9-eblake@redhat.com Signed-off-by: Max Reitz <mreitz@redhat.com>