linux-kernel - Re: [PATCHv2 1/5] VFS: DazukoFS, stackable-fs, file access control

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Message-ID: <20090212153146.GG28946@ZenIV.linux.org.uk>
Date:	Thu, 12 Feb 2009 15:31:46 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Jan Engelhardt <jengelh@...ozas.de>
Cc:	John Ogness <dazukocode@...ess.net>, linux-kernel@...r.kernel.org,
	malware-list@...ts.printk.net, eparis@...hat.com,
	hch@...radead.org, alan@...rguk.ukuu.org.uk
Subject: Re: [PATCHv2 1/5] VFS: DazukoFS, stackable-fs, file access control

On Thu, Feb 12, 2009 at 04:27:14PM +0100, Jan Engelhardt wrote:

> This ought to be done better in light of the problem that one
> could issue `mount -t dazukofs /mnt /opt`
> In kernel code, I'm thinking something like
> 
> static int foofs_dothis(...)
> {
> 	buf = call d_path on sb->s_root

Call what on what?  There is no such thing as the mountpoint of superblock.
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