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

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Date:	Thu, 12 Feb 2009 16:59:41 +0100 (CET)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Al Viro <viro@...IV.linux.org.uk>
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 Thursday 2009-02-12 16:31, Al Viro wrote:
>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.
>
In fs/namespace.c:do_new_mount there is 'path'. If 'path' was passed
down to the filesystem, path->dentry, I would assume, could be used
by the filesystem as a pointer to the original directory which
dazuko is going to shadow.
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