linux-kernel - Re: Finding hardlinks

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Message-ID: <Pine.LNX.4.64.0612281916230.2960@artax.karlin.mff.cuni.cz>
Date:	Thu, 28 Dec 2006 19:17:36 +0100 (CET)
From:	Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>
To:	Benny Halevy <bhalevy@...asas.com>
Cc:	Jeff Layton <jlayton@...chiereds.net>,
	Arjan van de Ven <arjan@...radead.org>,
	Jan Harkes <jaharkes@...cmu.edu>,
	Miklos Szeredi <miklos@...redi.hu>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	nfsv4@...f.org
Subject: Re: Finding hardlinks

>> This sounds like a bug to me. It seems like we should have a one to one
>> correspondence of filehandle -> inode. In what situations would this not be the
>> case?
>
> Well, the NFS protocol allows that [see rfc1813, p. 21: "If two file handles from
> the same server are equal, they must refer to the same file, but if they are not
> equal, no conclusions can be drawn."]
>
> As an example, some file systems encode hint information into the filehandle
> and the hints may change over time, another example is encoding parent
> information into the filehandle and then handles representing hard links
> to the same file from different directories will differ.

BTW. how does (or how should?) NFS client deal with cache coherency if 
filehandles for the same file differ?

Mikulas
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