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

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Message-ID: <ac3eb2510905221124y412dc3bdp65ad1b74373175a9@mail.gmail.com>
Date:	Fri, 22 May 2009 20:24:15 +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 17:54, Alan Stern <stern@...land.harvard.edu> wrote:

>> Would releasing the "lock" trigger a kernel-driver-binding call?
>
> No.  If the lock owner wants to bind kernel drivers, it can use the
> existing API in libusb after releasing the lock.  This might cause
> problems if the owning process terminates abnormally, but I think we
> can live with that.
>
>> The lock will always lock all devices of a specific hub?
>
> The idea is that there will be one lock file per port.  So for example,
> a hub device with four ports might contain inside its sysfs device
> directory: ports/1, ..., ports/4.

Sounds both good to me.

Kay
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