linux-kernel - Re: [PATCH] autofs4 - use lookup access intent to support recursive bind mounts

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Message-ID: <20080428062213.GB5882@ZenIV.linux.org.uk>
Date:	Mon, 28 Apr 2008 07:22:13 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Ian Kent <raven@...maw.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	autofs mailing list <autofs@...ux.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH] autofs4 - use lookup access intent to support
	recursive bind mounts

On Mon, Apr 28, 2008 at 02:14:54PM +0800, Ian Kent wrote:
> 
> Hi Andrew,
> 
> For autofs maps that recursively reference other map entries in their
> mount point path we need to ensure that these mounts are performed
> prior to the current mount request being done. We've used the access
> system call, made just prior to performing the mount, to make this
> happen. In the case of bind mounts, however, the lookup flags in 
> the path walk don't trigger a mount. To do this we need to also
> trigger a mount when we see the LOOKUP_ACCESS flag.

That's too fscking bad, since ->lookup() is about to lose access to
nameidata *and* flags for anything but the last step.  IOW, we'll need
cleaner solution...
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