linux-kernel - Re: [PATCH V3 0/8] Cleancache: overview

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Message-Id: <22A6238E-0BA4-4AB9-A4FA-28B206A47513@oracle.com>
Date:	Tue, 3 Aug 2010 12:34:19 -0600
From:	Andreas Dilger <andreas.dilger@...cle.com>
To:	Dan Magenheimer <dan.magenheimer@...cle.com>
Cc:	Boaz Harrosh <bharrosh@...asas.com>,
	Christoph Hellwig <hch@...radead.org>, ngupta@...are.org,
	akpm@...ux-foundation.org, Chris Mason <chris.mason@...cle.com>,
	viro@...iv.linux.org.uk, adilger@....com, tytso@....edu,
	mfasheh@...e.com, Joel Becker <joel.becker@...cle.com>,
	matthew@....cx, linux-btrfs@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-ext4@...r.kernel.org, ocfs2-devel@....oracle.com,
	linux-mm@...ck.org, jeremy@...p.org, JBeulich@...ell.com,
	Kurt Hackel <kurt.hackel@...cle.com>, npiggin@...e.de,
	Dave Mccracken <dave.mccracken@...cle.com>, riel@...hat.com,
	avi@...hat.com, Konrad Wilk <konrad.wilk@...cle.com>
Subject: Re: [PATCH V3 0/8] Cleancache: overview

On 2010-08-03, at 11:35, Dan Magenheimer wrote:
> - The FS should be block-device-based (e.g. a ram-based FS
>  such as tmpfs should not enable cleancache)

When you say "block device based", does this exclude network filesystems?  It would seem cleancache, like fscache, is actually best suited to high-latency network filesystems.

> - To ensure coherency/correctness, inode numbers must be unique
>  (e.g. no emulating 64-bit inode space on 32-bit inode numbers)

Does it need to be restricted to inode numbers at all (i.e. can it use an opaque internal identifier like the NFS file handle)?  Disallowing cleancache on a filesystem that uses 64-bit (or larger) inodes on a 32-bit system reduces its usefulness.

Cheers, Andreas
--
Andreas Dilger
Lustre Technical Lead
Oracle Corporation Canada Inc.

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