From: Ben Pfaff <blp@cs.stanford.edu>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] Re: patch to avoid space allocation for zero blocks in the qcow format
Date: Mon, 24 Apr 2006 23:43:12 -0000 [thread overview]
Message-ID: <878xpu7d6r.fsf@benpfaff.org> (raw)
In-Reply-To: 20060424221206.9BFF42946A@mail.bitblocks.com
Bakul Shah <bakul+qemu@bitblocks.com> writes:
> The below patch avoids allocating space in the qcow image
> format when a block of zeroes is being written. No attempt
> is made to free up space if a previously written block of
> nonzero data is being overwritten with zeroes.
This optimization is only possible for base disks (those with no
parent). Based on a quick glance at the diff, I am not sure
whether this change properly recognizes that. Does it?
--
Ben Pfaff
email: blp@cs.stanford.edu
web: http://benpfaff.org
prev parent reply other threads:[~2006-04-24 23:43 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-24 22:12 [Qemu-devel] patch to avoid space allocation for zero blocks in the qcow format Bakul Shah
2006-04-24 23:43 ` Ben Pfaff [this message]
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