Re: [Qemu-devel] drive transactions (was Re: [PATCH 2/2 v2] Add the blockdev-reopen and blockdev-migrate commands)

[Paolo Bonzini]

On 02/27/2012 05:58 PM, Anthony Liguori wrote:
>>
>> Jeff could rework his patches to work with transaction begin/commit
>> commands, and Federico can then add drive-reopen and drive-migrate on
>> top.
> 
> Yes, maybe I lack imagination but I fail to see how it generalizes
> easily/nicely.

> From what I can tell, all of the rollback logic is very specific to the
> commands being used, right?

The rollback logic is just "close the new devices".

The commit logic is specific to the commands being used, but reopen
should be easier than snapshot (and basically the same except for
backing_hd handling).

Migrate is really syntactic sugar around reopen, so no surprises there.

Paolo