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

[Lyu Mitnick <mitnick.lyu@gmail.com>]

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Hello Stefan,

"splitting hard disk images" feature depends on win32 file system. I am
wondering
whether it is suitable to implement in raw-win32.c?? My idea is as follows:
(1) adding an array to store file descriptor related in BDRVRawState
(2) detect all splitted files in raw_open(). ie. consider
files filename.vhd, filename.v01,
     filename.v02 ... . and construct the table to convert from sector_num
to splitted file
     and offset (store in BDRVRawState, too).
(3) use table constructed in step2 to read, write and flush
(4) close all opened splitted files in raw_close()

Would you mind to give some advice about the solution I take in this
problem??

2011/4/6 Stefan Hajnoczi <stefanha@gmail.com>

> On Tue, Apr 5, 2011 at 7:03 PM, Lyu Mitnick <mitnick.lyu@gmail.com> wrote:
> > Hello Stefan, Kevin
> > I don't want to diversify my GSoC applications. I thought I should do my
> > best of
> > supporting fully VHD and add asynchronous io into block/vpc.c via
> > coroutines. I
> > noticed that there is "splitting hard disk images" feature in VHD
> > specification. I
> > have take a look of block/raw-win32.c and guess there isn't this feature
> in
> > block/vpc.c.
> > I am wondering whether what I learned is right??
>
> Yes, split images are not supported by block/vpc.c.
>
> Stefan
>


Thanks so much

Mitnick

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