From: David Howells <dhowells@redhat.com>
To: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: Linux filesystem caching discussion list
<linux-cachefs@redhat.com>,
nfs@lists.sourceforge.net, Martin Waitz <tali@admingilde.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Steve Dickson <SteveD@redhat.com>,
Clemens Schwaighofer <cs@tequila.co.jp>
Subject: Re: Re: [PATCH] NFS using CacheFS
Date: Wed, 13 Oct 2004 11:40:22 +0100 [thread overview]
Message-ID: <30245.1097664022@redhat.com> (raw)
In-Reply-To: <1097508639.20033.12.camel@lade.trondhjem.org>
Trond Myklebust <trond.myklebust@fys.uio.no> wrote:
> That said, David & co.: why did you choose not to use something similar
> to the Solaris syntax for cachefs?
Well...
(1) when I wrote cachefs I didn't know that Solaris had such a thing
(2) I don't know what Solaris syntax is - I've seen one example, and that
didn't make a lot of sense
(3) my way doesn't involve any changes to userspace programs such as mount
> The "layered filesystem" syntax has the advantage that it would avoid
> entirely the need to change the NFS mount syntax,
And the disadvantage that we'd have to change the VFS to support it, I
think. I don't know how this "layered filesystem" thing operates or is used,
so I'm guessing.
> and would make it easier to port cachefs to cifs etc.
I doubt it. The netfs still has to interact with fscache internally to decide
how match netfs files to cache files, which is what most of the interface is
about; and to push/pull pages to/from the cache (this bit could possibly be
made transparent, but I'm not sure how you'd do it on Linux with the present
VM & VFS interfaces).
David
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prev parent reply other threads:[~2004-10-13 10:40 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-04 20:45 [PATCH] NFS using CacheFS Steve Dickson
2004-10-04 21:53 ` Trond Myklebust
2004-10-05 10:01 ` David Howells
2004-10-08 4:36 ` Clemens Schwaighofer
2004-10-08 9:02 ` [Linux-cachefs] " David Howells
2004-10-08 11:22 ` Steve Dickson
2004-10-11 14:23 ` Martin Waitz
2004-10-11 15:18 ` David Howells
2004-10-11 15:30 ` Trond Myklebust
2004-10-11 20:31 ` accessing/modifiying the nfs share files as different users bruce
2004-10-13 10:40 ` David Howells [this message]
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