linux-ext4 - Re: rfc: [patch] change attribute for ext3

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Date:	Thu, 14 Sep 2006 09:56:20 -0400
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	Peter Staubach <staubach@...hat.com>
Cc:	Alexandre Ratchov <alexandre.ratchov@...l.net>,
	linux-ext4@...r.kernel.org, nfsv4@...ux-nfs.org
Subject: Re: rfc: [patch] change attribute for ext3

On Thu, 2006-09-14 at 09:46 -0400, Peter Staubach wrote:
> Wouldn't the generation count work better than ctime to differentiate 
> between
> instances of files using the same inode number?  That way, there wouldn't be
> a clock resolution issue.

No. This is about distinguishing updates to the metadata/data of the
same instance. It is exactly what ctime was supposed to do, but ctime
relies on a clock which usually has too poor time resolution, may not be
monotonic, etc...

Cheers,
  Trond

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