Re: [Qemu-devel] [PATCH v3 2/8] block: add basic backup support to block driver

[Paolo Bonzini]

Il 21/05/2013 18:26, Dietmar Maurer ha scritto:
>> Hmm, right.  But do we need the bitmap at all?  We can just use
>> > bdrv_is_allocated like bdrv_co_do_readv does.
> Does that works with a nbd driver?

Ah, right.  That's the answer.

> Or does that add another RPC call (slow down)?

It doesn't work at all.  Thus Stefan's patch is fine (except if you
don't use HBitmapIter, there's no advantage in using HBitmap; you can
use qemu/bitmap.h instead).

Paolo