Date: Mon, 24 Sep 2007 07:16:15 -0600
From: Matthew Wilcox <matthew@wil.cx>
To: Miklos Szeredi <miklos@szeredi.hu>
Cc: hch@infradead.org, trond.myklebust@fys.uio.no, adilger@clusterfs.com,
       linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [patch 1/2] VFS: new fgetattr() file operation
Message-ID: <20070924131615.GN10625@parisc-linux.org>
References: <E1IZmze-0003q9-00@dorka.pomaz.szeredi.hu> <20070924123640.GA17409@infradead.org> <E1IZnM8-0003sG-00@dorka.pomaz.szeredi.hu> <20070924125948.GM10625@parisc-linux.org> <E1IZndW-0003uI-00@dorka.pomaz.szeredi.hu>
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On Mon, Sep 24, 2007 at 03:06:06PM +0200, Miklos Szeredi wrote:
> A file isn't deleted while there are still links or open files
> refering to it.  So getting the attributes for a file with nlink==0 is
> perfectly valid while the file is still open.

Is it?  Why not just pretend that the attributes are wiped when the file
is deleted.  Effectively, they are, since they can't affect anything.

> If a network filesystem protocol can't handle operations (be it data
> or metadata) on an unlinked file, we must do sillirenaming, so that
> the file is not actually unlinked.

Or you could call getattr right before you unlink and cache the result
in the client.

-- 
Intel are signing my paycheques ... these opinions are still mine
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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