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由 Eric Blake 提交于
Time to actually issue the QMP transactions that create and delete persistent checkpoints, resolving TODOs intentionally left earlier in the series. For create, we only need one transaction: inside, we visit all disks affected by the checkpoint, and create a new enabled bitmap, as well as disabling the bitmap of the first ancestor checkpoint (if any) that also had a bitmap. For deletion, we need multiple QMP calls: for each disk, if there is an ancestor checkpoint with a bitmap, then the bitmap must be merged (including activating the ancestor bitmap if the leaf node changes), all before deleting the bitmap from the checkpoint being removed. Signed-off-by: NEric Blake <eblake@redhat.com>
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