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: <200801081401.11975.nickpiggin@yahoo.com.au>
Date:	Tue, 8 Jan 2008 14:01:11 +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 08 January 2008 00:09, David Howells wrote:
> Nick Piggin <nickpiggin@...oo.com.au> wrote:
> > No. I mean call the bit PG_private2. That way non-pagecache and
> > filesystems that don't use fscache can use it.
>
> The bit is called PG_owner_priv_2, and then 'subclassed' to PG_fscache,
> much like PG_owner_priv_1 is 'subclassed' to PG_checked as was recommended.

It is not owner_priv if you're putting checks and tests into core
kernel pagecache code for it. owner_priv means a filesystem has it
_all_ to itself.
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