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    iotests/262: Switch source/dest VM launch order · 4d804b53
    Max Reitz authored
    
    
    Launching the destination VM before the source VM gives us a regression
    test for HEAD^:
    
    The guest device causes a read from the disk image through
    guess_disk_lchs().  This will not work if the first sector (containing
    the partition table) is yet unallocated, we use COR, and the node is
    inactive.
    
    By launching the source VM before the destination, however, the COR
    filter on the source will allocate that area in the image shared between
    both VMs, thus the problem will not become apparent.
    
    Switching the launch order causes the sector to still be unallocated
    when guess_disk_lchs() runs on the inactive node in the destination VM,
    and thus we get our test case.
    
    Signed-off-by: default avatarMax Reitz <mreitz@redhat.com>
    Reviewed-by: default avatarEric Blake <eblake@redhat.com>
    Message-id: 20191001174827.11081-3-mreitz@redhat.com
    Message-Id: <20191001174827.11081-3-mreitz@redhat.com>
    Signed-off-by: default avatarStefan Hajnoczi <stefanha@redhat.com>
    4d804b53