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Re: [Qemu-devel] 'qemu-nbd' explicite flush to disk
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] 'qemu-nbd' explicite flush to disk |
Date: |
Thu, 13 Sep 2012 08:30:15 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120828 Thunderbird/15.0 |
Il 12/09/2012 23:28, Mark Trumpold ha scritto:
> So, I've been experimenting with 'qemu-nbd --cache=writeback ..'
> This nicely eliminates the 'checkpoint' issue; however, I have as
> yet been unable to explicitely flush things to disk -- which I would like to
> do just before a 'nilfs' snapshot.
The Linux kernel driver for NBD does not support flushes. Patches were
sent to the maintainer, but he never applied them.
You can get them at
http://thread.gmane.org/gmane.linux.drivers.nbd.general/1108 and try them.
> Subsequently I've been trying to call 'bdrv_co_flush(bs)' directly, but I
> can't figure out how to dereference 'bs' for the call.
>
> I'm probably out in the weeds on this one.
> Any guidance would be greatly appreciated.
>
> I am running:
> qemu-1.2.0
> linux kernel 3.3.1
>
> Thank you,
> Mark Trumpold
>
>
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I doubt so, since this is a public mailing list.
Paolo