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

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Message-ID: <45095D1B.8040201@redhat.com>
Date:	Thu, 14 Sep 2006 09:46:03 -0400
From:	Peter Staubach <staubach@...hat.com>
To:	Trond Myklebust <trond.myklebust@....uio.no>
CC:	Alexandre Ratchov <alexandre.ratchov@...l.net>,
	linux-ext4@...r.kernel.org, nfsv4@...ux-nfs.org
Subject: Re: rfc: [patch] change attribute for ext3

Trond Myklebust wrote:
> On Wed, 2006-09-13 at 18:42 +0200, Alexandre Ratchov wrote:
>   
>> hello, 
>>
>> here is a small patch that adds the "change attribute" for ext3
>> file-systems;
>>
>> the change attribute is a simple counter that is reset to zero on
>> inode creation and that is incremented every time the inode data is
>> modified (similarly to the "ctime" time-stamp).
>>     
>
> I would really have preferred a full-blown 64-bit counter as per
> RFC3530, but I suppose we could always combine this change attribute
> with the high word from ctime in order to make up the NFSv4 change
> attribute. That should keep us safe until someone develops a ramdisk
> with < 1 nsecond access time.

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.

    Thanx...

       ps
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