Re: [PATCH V3 0/8] Cleancache: overview

From: Andreas Dilger
Date: Tue Aug 03 2010 - 14:36:56 EST

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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