[Libguestfs] Support for qemu snapshot=on drives in libvirt

[Richard W.M. Jones]

On Fri, Oct 05, 2012 at 01:52:46PM +0200, Paolo Bonzini wrote:
> Il 05/10/2012 13:40, Richard W.M. Jones ha scritto:
> > I'm also concerned about the time is takes to run the external
> > 'qemu-img create' command, which is non-trivial in some versions
> > of qemu.  In libguestfs, every millisecond counts.
> 
> qemu-img create is a thin wrapper for bdrv_create that would be done
> anyway by QEMU.  So there is no difference apart from the cost of
> loading the binary.

Right -- that's the point though :-(

Using qemu snapshot=on is free, since we've launched qemu already.

Rich.

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