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To: "Peter J. Braam" <braam@clusterfs.com>
Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: tmpfs, NFS, file handles
In-Reply-To: <20020220094649.X25738@lustre.cfs>
	<3C73D548.648C5D64@mandrakesoft.com>
	<20020220122116.C28913@lustre.cfs>
From: Trond Myklebust <trond.myklebust@fys.uio.no>
Date: 20 Feb 2002 20:42:50 +0100
In-Reply-To: <20020220122116.C28913@lustre.cfs>
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>>>>> " " == Peter J Braam <braam@clusterfs.com> writes:

     > Would the following also work?

     > - have a 32 bit counter: set inode->i_ino to count++

That is exactly what iunique() does except that it also checks for
uniqueness and allows you to specify a minimum value. Sooner or later
your 32-bit counter will wrap round...

     > - up the generation number each time the counter warps.

     > Between boot cycles NFS could still get confused, that might be
     > helped by setting the initial generation to the system time.

Yep. That is what the 'fat' filesystem does.

Cheers,
  Trond
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