From: Jamie Lokier <jamie@shareable.org>
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] Re: [PATCH][v2] Align file accesses with cache=off (O_DIRECT)
Date: Wed, 21 May 2008 16:31:15 +0100 [thread overview]
Message-ID: <20080521153115.GA20527@shareable.org> (raw)
In-Reply-To: <48342C66.9080407@codemonkey.ws>
Anthony Liguori wrote:
> >If you change part of the data but leave the checksum as-is, you'd
> >hopefully get a checksum mismatch... ;)
>
> That's the point though, you're not changing part of the data. You're
> rewriting the same data.
Usually you're changing some bytes in a block but leaving others the same.
Why else would you write at all?
But even if you do write the same bits _exactly_, the bits written
will not overlay the original data bits precisely enough to make
aborting in the middle seamless.
-- Jamie
next prev parent reply other threads:[~2008-05-21 15:31 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-20 11:32 [Qemu-devel] [PATCH][v2] Align file accesses with cache=off (O_DIRECT) Laurent Vivier
2008-05-20 19:47 ` [Qemu-devel] " Anthony Liguori
2008-05-20 22:36 ` Jamie Lokier
2008-05-20 22:52 ` Paul Brook
2008-05-20 22:59 ` Laurent Vivier
2008-05-21 0:54 ` Paul Brook
2008-05-21 7:59 ` Laurent Vivier
2008-05-21 0:58 ` Anthony Liguori
2008-05-21 1:04 ` Jamie Lokier
2008-05-21 1:05 ` Anthony Liguori
2008-05-21 8:06 ` Kevin Wolf
2008-05-21 1:05 ` Paul Brook
2008-05-21 1:14 ` Anthony Liguori
2008-05-21 8:24 ` Kevin Wolf
2008-05-21 12:26 ` Jamie Lokier
2008-05-21 12:37 ` Avi Kivity
2008-05-21 13:41 ` Jamie Lokier
2008-05-21 13:55 ` Anthony Liguori
2008-05-21 14:17 ` Avi Kivity
2008-05-21 14:26 ` Anthony Liguori
2008-05-21 14:57 ` Avi Kivity
2008-05-21 15:34 ` Jamie Lokier
2008-05-21 16:02 ` Anthony Liguori
2008-05-21 16:24 ` Jamie Lokier
2008-05-21 16:48 ` Avi Kivity
2008-05-21 17:01 ` Andrea Arcangeli
2008-05-21 17:18 ` Avi Kivity
2008-05-21 17:47 ` Andrea Arcangeli
2008-05-21 17:53 ` Anthony Liguori
2008-05-21 18:08 ` Andrea Arcangeli
2008-05-21 18:25 ` Anthony Liguori
2008-05-21 20:13 ` Andrea Arcangeli
2008-05-21 20:35 ` Anthony Liguori
2008-05-21 20:42 ` Andrea Arcangeli
2008-05-21 18:29 ` Avi Kivity
2008-05-21 16:45 ` Avi Kivity
2008-05-21 16:44 ` Avi Kivity
2008-05-20 23:04 ` Laurent Vivier
2008-05-20 23:13 ` Jamie Lokier
2008-05-21 1:00 ` Anthony Liguori
2008-05-21 1:19 ` Jamie Lokier
2008-05-21 2:12 ` Anthony Liguori
2008-05-21 8:27 ` Andreas Färber
2008-05-21 14:06 ` Anthony Liguori
2008-05-21 15:31 ` Jamie Lokier [this message]
2008-05-21 11:43 ` Jamie Lokier
2008-05-23 9:12 ` Laurent Vivier
2008-05-28 7:01 ` Kevin Wolf
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