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

[Jamie Lokier]

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).

-- Jamie