Re: [Qemu-devel] GSoC - QCOW2 <-> QED image converter

[Lyu Mitnick]

Hello Christoph,

2011/4/6 Christoph Hellwig <address@hidden>

On Wed, Apr 06, 2011 at 05:15:29PM +0200, Kevin Wolf wrote:
> Am 06.04.2011 17:06, schrieb Christoph Hellwig:
> > On Wed, Apr 06, 2011 at 07:41:37AM +0100, Stefan Hajnoczi wrote:
> >> Yes, split images are not supported by block/vpc.c.
> >
> > I'm working on that feature for vmdk right now, which is quite
> > interesting as vmdk really is two different format both claiming
> > to be vmdk, of which one is simply a text file telling how other
> > vmdk images are glued together.
>
> Last time I checked the other one wasn't a single format either, but
> rather something like ten different subformats.

The binary vmdk files have a few different revisions too, yes.

> Anyway, if you're working on split VMDK images, I should probably stop
> advertising it as a GSoC project?

I didn't know it was advertised, but there's indeed no need to duplicate the
work.

Would you mind to share your solution about this feature?? My idea is replace

all bdrv_pread(), bdrv_pwrite_sync(), bdrv_pwrite() in block/vpc.c to 

bdrv_pread_split(),  bdrv_pwrite_sync_split(), bdrv_pwrite_split() corresponding.

bdrv_pread_split(),  bdrv_pwrite_sync_split(), bdrv_pwrite_split() should deal with

data splitted at different files via bdrv_pread(), bdrv_pwrite_sync(), bdrv_pwrite(),

give an interface of sequential byte accessed. Is it suitable to solve this issue??

Thanks a lot

Mitnick