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

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Message-ID: <20070309141246.2059c9dc@lxorguk.ukuu.org.uk>
Date:	Fri, 9 Mar 2007 14:12:46 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"Pekka Enberg" <penberg@...helsinki.fi>
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

> 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...

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).

Alan
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