Re: [Qemu-devel] [RFC] introduce a dynamic library to expose qemu block API

[Wenchao Xia]

于 2012-7-9 22:36, Christoph Hellwig 写道:
> On Mon, Jul 09, 2012 at 04:54:08PM +0800, Wenchao Xia wrote:
> > Hi, Paolo and folks,
> >    qemu have good capabilities to access different virtual disks, I want
> > to expose its block layer API to let 3rd party program linked in, such
> > as management stack or block tools, to access images data directly.
> >
> > Following is the objects:
> >    (1) API to write/read block device at offset.
> >    (2) Determine the image type,qcow2/qed/raw
> >    (3) Determine which blocks are allocated.
> >    (4) Determine backing file.
>
> Sounds like you want a procedural interface for that.  At least for (1)
> I have patches I'll submit soon to add qemu img read/write commands.
  Yes, the purpose is introduce API interface about block data, the
operation was supposed to happen frequently, a linked-in library may be
better than process output string parsing in performance.

>


--
Best Regards

Wenchao Xia