migration/block: Use real permissions
Request BLK_PERM_CONSISTENT_READ for the source of block migration, and handle potential permission errors as good as we can in this place (which is not very good, but it matches the other failure cases). Signed-off-by: NKevin Wolf <kwolf@redhat.com> Acked-by: NFam Zheng <famz@redhat.com> Reviewed-by: NMax Reitz <mreitz@redhat.com>
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