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

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Message-ID: <ac3eb2510905221454u2fd7fe88tb3d6c13c6ae550a@mail.gmail.com>
Date:	Fri, 22 May 2009 23:54:16 +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 Fri, May 22, 2009 at 21:31, Alan Stern <stern@...land.harvard.edu> wrote:
> Come to think of it, putting the lock files in sysfs isn't such a good
> idea.  The core will need to know whether the files are open, so we'll
> have to have our own file_operations structure for them.
>
> Which means the best place to put the lock files is probably somewhere
> in /dev.  Can this be made to work by generating appropriate uevents,
> with the default udev rules?

Nodes in /dev would  need a corresponding device in /sys and belong to
a subsystem to send an event. That sounds like a lot of stuff for a
simple interface like this. Can't we just add ioctls to the hub device
nodes to implement the locking?

Thanks,
Kay
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