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List:       v9fs-developer
Subject:    Re: [V9fs-developer] [Qemu-devel] Breaking out virtfs as a
From:       Rob Landley <rlandley () parallels ! com>
Date:       2011-04-15 21:25:11
Message-ID: 4DA8B7B7.7010807 () parallels ! com
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On 04/15/2011 04:21 PM, Jim Garlick wrote:
>> Sticking a cacheing filesystem on top of 9P ala cachefs makes sense.
>> Spraying cacheing into 9P itself really sounds like a horrible mistake.
> 
> It's not what you think.
> 
> The caching support in 9p is non-coherent, requires no protocol or
> server support, and doesn't add significant complexity to the client.
> 
> It's potentially useful for a 1:1 server:client mount, or for read-only 1:N.
> 
> Jim

In those limited circumstances it may make sense, but I hope that
limitation is explicitly documented and upheld.

Inevitably, somebody will try to use it for something else and complain,
and maybe even submit patches.  When that day comes, I hope the
maintainer is prepared to say "no".

Rob

(P.S.  Sorry.  Rather a long time staring at the NFS codebase talking.
The horror is palpable, yet does not respond well to being palped.)

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