linux-kernel - Re: [PATCH 2/7] revoke: add f

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Message-ID: <Pine.LNX.4.64.0703091512400.21669@sbz-30.cs.Helsinki.FI>
Date:	Fri, 9 Mar 2007 15:13:40 +0200 (EET)
From:	Pekka J Enberg <penberg@...helsinki.fi>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
cc:	Eric Dumazet <dada1@...mosbay.com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, hch@...radead.org, serue@...ibm.com
Subject: Re: [PATCH 2/7] revoke: add f_light flag for struct file

At some point in time, I wrote:
> > Btw, what we can do is delay closing the actual revoked file until the
> > task terminates. This has the unfortunate side-effect that a task has
> > no way of freeing the resources now. But, I am beginning to think it's
> > not a big problem because the inode mapping will be zapped immediately
> > upon revoke anyway...
 
On Fri, 9 Mar 2007, Alan Cox wrote:
> Actually you can't entirely do this. The revoke() definition states
> explicitly that the driver close occurs at the point of revoke() not
> later.
> 
> That can however be pushed into the device revoke method for the cases
> where it might matter (eg tty).

Yeah, you just make f_ops->revoke close the driver and f_ops->flush a 
no-op if the driver has already been closed.

			Pekka
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