Re: [Qemu-devel] [PATCH v2 2/3] block: add block-backup QMP command

[Paolo Bonzini <pbonzini@redhat.com>]

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Il 11/05/2013 05:34, Eric Blake ha scritto:
> On 05/08/2013 06:49 AM, Kevin Wolf wrote:
>> Am 29.04.2013 um 09:42 hat Stefan Hajnoczi geschrieben:
>>> @block-backup
>>> 
> 
>> drive-backup would probably be a more consistent naming. We would
>> then still have block-backup for a future low-level command that
>> doesn't create everything by itself but takes an existing
>> BlockDriverState (e.g. created by blockdev-add).
> 
> At least it would match why we named a command 'drive-mirror'
> instead of 'block-mirror'.
> 
> Hmm, looking at qapi-schema.json, I wonder if we can rename 
> 'BlockdevAction' to 'TransactionAction' as used in the
> @transaction command.  It wouldn't change what is sent over the
> wire in JSON, and until we have full introspection, there is no
> visibility into the type name used.  Changing the name now would
> let it be more generic to adding future transaction items that are
> not blockdev related.

Right.  For example, "cont" could be made transactionable too (and
executed only if the transaction succeeds).

Paolo

>> 
>> We should also make it transactionable from the beginning, as we
>> don't have schema introspection yet. This way we allow to assume
>> that if the standalone command exists, the transaction subcommand
>> exists as well.
> 
> Agreed - existence of a command at the same time the command is
> made transactionable serves as a nice substitute for not having
> full introspection into the 'BlockdevAction' union type, whereas if
> we introduce the command now but not transaction support until 1.7,
> life becomes tougher to know when it can be used where (although I
> HOPE we have introspection in 1.6).
> 

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