linux-kernel - Re: How to tell whether a struct file is held by a process?

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Message-ID: <ac3eb2510905231547y6da1b3a6m6ef8921c8f56dc00@mail.gmail.com>
Date:	Sun, 24 May 2009 00:47:51 +0200
From:	Kay Sievers <kay.sievers@...y.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Kyle Moffett <kyle@...fetthome.net>,
	Pantelis Koukousoulas <pktoss@...il.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: How to tell whether a struct file is held by a process?

On Sat, May 23, 2009 at 00:07, Alan Stern <stern@...land.harvard.edu> wrote:

>> Can't we just add ioctls to the hub device
>> nodes to implement the locking?
>
> Yes, that would work.  Closing the hub device file would release all
> the locked ports.
>
> It wouldn't leave any lock files for user programs.  They would have to
> arrange the locking among themselves somehow.  Would that be okay?

I would expect that userspace drivers competing about raw USB devices
wouldn't be that common. And I guess, most of these problems can
probably be solved by simple file permissions/ACLs applied to the USB
device nodes, in the same way the access to the hub device node would
be granted to lock-out the kernel drivers.

Kay
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