linux-kernel - Re: [RFC][PATCH] block: Isolate the buffer cache in it's own mappings.

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Message-ID: <20071022001515.GW995458@sgi.com>
Date:	Mon, 22 Oct 2007 10:15:15 +1000
From:	David Chinner <dgc@....com>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Chris Mason <chris.mason@...cle.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	"Theodore Ts'o" <tytso@....edu>, stable@...nel.org
Subject: Re: [RFC][PATCH] block: Isolate the buffer cache in it's own mappings.

On Sun, Oct 21, 2007 at 02:24:46PM +1000, Nick Piggin wrote:
> On Saturday 20 October 2007 07:27, Eric W. Biederman wrote:
> > Currently only 
> > metadata is more or less in sync with the contents of /dev/hda1.
> 
> It either is or it isn't, right? And it is, isn't it? (at least
> for the common filesystems).

It is not true for XFS - it's metadata is not in sync with /dev/<block>
at all as all the cached metadata is kept in a different address space
to the raw block device.

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group
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