[libvirt] [PATCH 2/2] Use posix_fallocate() to allocate disk space on supported systems

[Daniel P. Berrange]

On Thu, Mar 19, 2009 at 12:45:25PM +0530, Amit Shah wrote:
> Make use of the safezero() function to allocate disk space instead
> of safewrite() to write zeros. The safezero() function will use
> posix_fallocate() on supported systems.
> 
> If progress activity is not requested (current behaviour), the new
> safezero() function will allocate the file in one go.
> 
> If progress activity is requested, allocate in 512MiB chunks.

ACK, this looks good, assuming we change the non-fallocate() safezero() 
impl to not allocate huge chunks of memory.  

The 'static int track_allocation_progress' is fine as you have it - it
is a useful reminder that we need to expose this functionality via the
API, and we can move it as needed at that time.

Regards,
Daniel
-- 
|: Red Hat, Engineering, London   -o-   http://people.redhat.com/berrange/ :|
|: http://libvirt.org  -o-  http://virt-manager.org  -o-  http://ovirt.org :|
|: http://autobuild.org       -o-         http://search.cpan.org/~danberr/ :|
|: GnuPG: 7D3B9505  -o-  F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|