From: Trond Myklebust <trond.myklebust@fys.uio.no>
To: Xin Zhao <uszhaoxin@gmail.com>
Cc: Matthew Wilcox <matthew@wil.cx>, Neil Brown <neilb@suse.de>,
linux-kernel <linux-kernel@vger.kernel.org>,
linux-fsdevel@vger.kernel.org
Subject: Re: Urgent help needed on an NFS question, please help!!!
Date: Thu, 10 Aug 2006 13:28:41 -0400 [thread overview]
Message-ID: <1155230922.10547.61.camel@localhost> (raw)
In-Reply-To: <4ae3c140608100923j1ffb5bb5qa776bff79365874c@mail.gmail.com>
On Thu, 2006-08-10 at 12:23 -0400, Xin Zhao wrote:
> That makes sense.
>
> Can we make the following two conclusions?
> 1. In a single machine, inode+dev ID+i_generation can uniquely identify a file
Not really. The device id is frequently subject to change on server
reboot or device disconnect/reconnect.
> 2. Given a stored file handle and an inode object received from the
> server, an NFS client can safely determine whether this inode
> corresponds to the file handle by checking the inode+dev+i_generation.
No! The file handle is an opaque bag of bytes as far as clients are
concerned. If you change the server, then the filehandle format can and
will change. On linux, even changing the setting of the subtree_checking
export option will suffice to change the filehandle.
Cheers,
Trond
next prev parent reply other threads:[~2006-08-10 17:29 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-10 5:04 Urgent help needed on an NFS question, please help!!! Xin Zhao
2006-08-10 5:11 ` Neil Brown
2006-08-10 5:54 ` Xin Zhao
2006-08-10 6:03 ` Neil Brown
2006-08-10 15:15 ` Xin Zhao
2006-08-10 16:11 ` Matthew Wilcox
2006-08-10 16:23 ` Xin Zhao
2006-08-10 16:54 ` Matthew Wilcox
2006-08-10 17:08 ` Xin Zhao
2006-08-10 17:38 ` Trond Myklebust
2006-08-10 17:28 ` Trond Myklebust [this message]
2006-08-10 18:02 ` Xin Zhao
2006-08-10 19:59 ` Trond Myklebust
2006-08-10 22:25 ` Xin Zhao
2006-08-11 0:44 ` Trond Myklebust
2006-08-10 22:28 ` Xin Zhao
2006-08-11 0:38 ` Trond Myklebust
2006-08-10 23:42 ` Bryan Henderson
2006-08-10 17:50 ` Bryan Henderson
2006-08-10 18:15 ` Xin Zhao
2006-08-11 0:07 ` Bryan Henderson
2006-08-10 21:00 ` Peter Staubach
2006-08-10 6:04 ` Xin Zhao
2006-08-10 6:15 ` Xin Zhao
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