[libvirt] [PATCH 1/2] Introduce posix_fallocate() to allocate disk space

Daniel P. Berrange berrange at redhat.com
Fri Mar 20 11:11:47 UTC 2009

On Thu, Mar 19, 2009 at 08:17:53PM +0530, Amit Shah wrote:
> Using posix_fallocate() to allocate disk space and fill it with zeros is faster
> than writing the zeros block-by-block.
> Also, for backing file systems that support extents and the fallocate() syscall,
> this operation will give us a big speed boost.
> This also brings us the advantage of very less fragmentation for the chunk being
> allocated.
> For systems that don't support posix_fallocate(), fall back to safewrite().

ACK, looks good now.

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