block: Error out on load_vm with active dirty bitmaps
Loading a snapshot invalidates the bitmap. Just marking all blocks dirty is not a useful response in practice, instead the user needs to be aware that we switch to a completely different state. If they are okay with losing the dirty bitmap, they can just explicitly delete it. This effectively reverts commit 04dec3c3. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NDenis V. Lunev <den@openvz.org> Reviewed-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: NJohn Snow <jsnow@redhat.com>
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