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

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Message-ID: <20090522144343.7b26b3a8@lxorguk.ukuu.org.uk>
Date:	Fri, 22 May 2009 14:43:43 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Pantelis Koukousoulas <pktoss@...il.com>
Cc:	Kernel development list <linux-kernel@...r.kernel.org>,
	Kay Sievers <kay.sievers@...y.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: How to tell whether a struct file is held by a process?

> Suppose a device needs a reset as part of its init sequence (a whole lot
> of them do, this is not purely hypothetical). Then a different process may
> get to operate the device before and after the reset and hilarity may result
> from that.

Thats surely up to you to get your lock file usage right. The kernel
isn't there to play mother to crap programming.

> So, if there is a clean / acceptable way to handle the reset issue in userspace

Firstly can you explain *why* you think there is a problem ?
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