linux-kernel - Re: [PATCH 04/22][RFC] Unionfs: Common file operations

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Message-Id: <1157151440.5628.42.camel@localhost>
Date:	Fri, 01 Sep 2006 18:57:20 -0400
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	Shaya Potter <spotter@...columbia.edu>
Cc:	Josef Sipek <jsipek@...sunysb.edu>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, hch@...radead.org, akpm@...l.org,
	viro@....linux.org.uk
Subject: Re: [PATCH 04/22][RFC] Unionfs: Common file operations

On Fri, 2006-09-01 at 18:36 -0400, Shaya Potter wrote:
> On Fri, 2006-09-01 at 18:20 -0400, Trond Myklebust wrote:
> 
> > Race! You cannot open an underlying NFS file by name after it has been
> > looked up: you have no guarantee that it hasn't been renamed.
> 
> In a unionfs case that's not an issue.  Nothing else is allowed to use
> the backing store (i.e. the nfs fs) while unionfs is using it, so there
> shouldn't be a renaming issue.

How are you enforcing that on the server?



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