linux-kernel - Re: [PATCH 0/4] autofs4 - autofs needs a miscelaneous device for ioctls

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Message-Id: <20080227204002.49f4c5fb.akpm@linux-foundation.org>
Date:	Wed, 27 Feb 2008 20:40:02 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ian Kent <raven@...maw.net>
Cc:	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 0/4] autofs4 - autofs needs a miscelaneous device for
 ioctls

On Tue, 26 Feb 2008 12:21:58 +0900 (WST) Ian Kent <raven@...maw.net> wrote:

> 
> Hi Andrew,
> 
> There is a problem with active restarts in autofs (that is to
> say restarting autofs when there are busy mounts).
> 
> Currently autofs uses "umount -l" to clear active mounts at
> restart. While using lazy umount works for most cases, anything
> that needs to walk back up the mount tree to construct a path,
> such as getcwd(2) and the proc file system /proc/<pid>/cwd, no
> longer works because the point from which the path is constructed
> has been detached from the mount tree.
> 
> The actual problem with autofs is that it can't reconnect to
> existing mounts. Immediately one things of just adding the
> ability to remount autofs file systems would solve it, but
> alas, that can't work. This is because autofs direct mounts
> and the implementation of "on demand mount and expire" of
> nested mount trees have the file system mounted on top of
> the mount trigger dentry.
> 
> To resolve this a miscellaneous device node for routing ioctl
> commands to these mount points has been implemented for the
> autofs4 kernel module.
> 
> For those wishing to test this out an updated user space daemon
> is needed. Checking out and building from the git repo or
> applying all the current patches to the 5.0.3 tar distribution
> will do the trick. This is all available at the usual location
> on kernel.org.
> 

Could we please be a bit more specific than "the usual location"?

Should autofs userspace have an entry in Documentation/Changes?
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