Re: [Qemu-devel] [PATCH 00/10] block/json: Add JSON protocol driver

[Eric Blake]

On 03/03/2014 08:28 AM, Max Reitz wrote:
> This series adds a passthrough JSON protocol block driver. Its filenames
> are JSON objects prefixed by "json:". The objects are used as options
> for opening another block device which will be the child of the JSON
> device. Regarding this child device, the JSON driver behaves nearly the
> same as raw_bsd in that it is just a passthrough driver. The only
> difference is probably that the JSON driver identifies itself as a block
> filter, in contrast to raw_bsd.
> 
> The purpose of this driver is that it may sometimes be desirable to
> specify options for a block device where only a filename can be given,
> e.g., for backing files. Using this should obviously be the exception,
> but it is nice to have if actually needed.

I like the idea!  It will be more work for libvirt to actually
understand how a json: protocol is actually interpreted if it encounters
a qcow2 file with a json: backing file, but it does open up
possibilities that are hard to encode in any other sane way.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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