Re: [Qemu-devel] [PATCH] Add new block driver for the VDI format (use aio)

[Kevin Wolf]

Jamie Lokier schrieb:
> Daniel P. Berrange wrote:
>>> By the way, why is fallocate() support being added to libvirt to
>>> improve disk image creation, instead of to qemu-img?
>> libvirt has to work with more than just QEMU.  Thus it has a built in
>> support for creating raw files, and this is where we added fallocate
>> support. It also has ability to call out to hypervisor specific tools
>> for creating non-raw formats. We support qemu-img, and qcow-create (the
>> latter from Xen)
> 
> Ok.  It sounds like fallocate() support would be useful for qemu-img
> too (even if libvirt is used to manage it, if it didn't produce it).

I agree, fallocate seems to be the right way to implement my suggestion
of a generic preallocate option in qemu-img. It's on my list, so I'm
going to work on it when I come back from vacation in two weeks.

Kevin