linux-kernel - Re: [PATCH 10/28] FS-Cache: Recruit a couple of page flags for cache management [try #2]

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Message-Id: <200712181800.23578.nickpiggin@yahoo.com.au>
Date:	Tue, 18 Dec 2007 18:00:23 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	David Howells <dhowells@...hat.com>
Cc:	viro@....linux.org.uk, hch@...radead.org,
	Trond.Myklebust@...app.com, sds@...ho.nsa.gov,
	casey@...aufler-ca.com, linux-kernel@...r.kernel.org,
	selinux@...ho.nsa.gov, linux-security-module@...r.kernel.org
Subject: Re: [PATCH 10/28] FS-Cache: Recruit a couple of page flags for cache management [try #2]

On Tuesday 18 December 2007 09:36, David Howells wrote:
> Nick Piggin <nickpiggin@...oo.com.au> wrote:
> > I'd much prefer if you would handle this in the filesystem, and have it
> > set PG_private whenever fscache needs to receive a callback, and DTRT
> > depending on whether PG_fscache etc. is set or not.
>
> That's tricky and slower[*].  One of the things I want to do is to modify
> iso9660 to do be able to do caching, but PG_private is 'owned' by the
> generic buffer cache code.

Maybe it is harder, but it is the right way to do it. So you
should modify the filesystems rather than core code.
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