[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] Re: [PATCH][v2] Align file accesses with cache=off (O_D
From: |
Jamie Lokier |
Subject: |
Re: [Qemu-devel] Re: [PATCH][v2] Align file accesses with cache=off (O_DIRECT) |
Date: |
Wed, 21 May 2008 16:31:15 +0100 |
User-agent: |
Mutt/1.5.13 (2006-08-11) |
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
- Re: [Qemu-devel] Re: [PATCH][v2] Align file accesses with cache=off (O_DIRECT), (continued)
- Re: [Qemu-devel] Re: [PATCH][v2] Align file accesses with cache=off (O_DIRECT), Avi Kivity, 2008/05/21
- Re: [Qemu-devel] Re: [PATCH][v2] Align file accesses with cache=off (O_DIRECT), Avi Kivity, 2008/05/21
- Re: [Qemu-devel] Re: [PATCH][v2] Align file accesses with cache=off (O_DIRECT), Avi Kivity, 2008/05/21
- Re: [Qemu-devel] Re: [PATCH][v2] Align file accesses with cache=off (O_DIRECT), Laurent Vivier, 2008/05/20
- Re: [Qemu-devel] Re: [PATCH][v2] Align file accesses with cache=off (O_DIRECT), Jamie Lokier, 2008/05/20
- Re: [Qemu-devel] Re: [PATCH][v2] Align file accesses with cache=off (O_DIRECT), Anthony Liguori, 2008/05/20
- Re: [Qemu-devel] Re: [PATCH][v2] Align file accesses with cache=off (O_DIRECT), Jamie Lokier, 2008/05/20
- Re: [Qemu-devel] Re: [PATCH][v2] Align file accesses with cache=off (O_DIRECT), Anthony Liguori, 2008/05/20
- Re: [Qemu-devel] Re: [PATCH][v2] Align file accesses with cache=off (O_DIRECT), Andreas Färber, 2008/05/21
- Re: [Qemu-devel] Re: [PATCH][v2] Align file accesses with cache=off (O_DIRECT), Anthony Liguori, 2008/05/21
- Re: [Qemu-devel] Re: [PATCH][v2] Align file accesses with cache=off (O_DIRECT),
Jamie Lokier <=
- Re: [Qemu-devel] Re: [PATCH][v2] Align file accesses with cache=off (O_DIRECT), Jamie Lokier, 2008/05/21
Re: [Qemu-devel] Re: [PATCH][v2] Align file accesses with cache=off (O_DIRECT), Laurent Vivier, 2008/05/23