From: Greg Banks <gnb@sgi.com>
Subject: Re: Converting open filehandles to pathnames
Date: Sun, 9 May 2004 17:24:18 +1000
Sender: nfs-admin@lists.sourceforge.net
Message-ID: <20040509072418.GB18762@sgi.com>
References: <1084059203.714.13.camel@omikron>
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Cc: nfs@lists.sourceforge.net
To: Erik Walthinsen <omega@pdxcolo.net>
In-Reply-To: <1084059203.714.13.camel@omikron>
Errors-To: nfs-admin@lists.sourceforge.net

On Sat, May 08, 2004 at 04:33:28PM -0700, Erik Walthinsen wrote:
> I've got an NFS server with client machines running User-mode Linux. 
>[...]
> My question: is there some means of divining the device/inode of a
> filehandle?  I looked around the NFS and VFS code and found nothing that
> looked promising, but I don't really understand the VFS subsystem.

Generally the device and inode of the file are encoded in the
file handle itself rather than mapped in the server; this is
the easiest way of satisfying the requirement that the filehandles
be stable across server reboots.

If your NFS server is a Linux box, see the comments in
include/linux/nfsd/nfsfh.h for a description of the format
of Linux' file handles.

Also, ethereal will pick apart and display Linux file handles
(unless the underlying server fs is XFS).

Greg.
-- 
Greg Banks, R&D Software Engineer, SGI Australian Software Group.
I don't speak for SGI.


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