linux-kernel - Re: tty && pid problems

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Date:	Wed, 20 Feb 2008 20:00:44 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	Oleg Nesterov <oleg@...sign.ru>
CC:	Valdis.Kletnieks@...edu,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>, roland@...hat.com,
	linux-kernel@...r.kernel.org, Pavel Emelyanov <xemul@...nvz.org>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: tty && pid problems

On 02/20/2008 05:28 PM, Oleg Nesterov wrote:
> I think you can revert the tty-bkl-pushdown.patch. Or, as Eric suggested, just
> revert this
> 
> 	@@ -1222,7 +1221,7 @@ static const struct file_operations tty_
> 		.read           = tty_read,
> 		.write          = tty_write,
> 		.poll           = tty_poll,
> 	-       .ioctl          = tty_ioctl,
> 	+       .unlocked_ioctl = tty_ioctl,
> 		.compat_ioctl   = tty_compat_ioctl,
> 		.open           = tty_open,
> 		.release        = tty_release,
> 	@@ -1235,7 +1234,7 @@ static const struct file_operations ptmx
> 		.read           = tty_read,
> 		.write          = tty_write,
> 		.poll           = tty_poll,
> 	-       .ioctl          = tty_ioctl,
> 	+       .unlocked_ioctl = tty_ioctl,
> 		.compat_ioctl   = tty_compat_ioctl,
> 		.open           = ptmx_open,
> 		.release        = tty_release,
> 	@@ -1248,7 +1247,7 @@ static const struct file_operations cons
> 		.read           = tty_read,
> 		.write          = redirected_tty_write,
> 		.poll           = tty_poll,
> 	-       .ioctl          = tty_ioctl,
> 	+       .unlocked_ioctl = tty_ioctl,
> 		.compat_ioctl   = tty_compat_ioctl,
> 		.open           = tty_open,
> 		.release        = tty_release,
> 	@@ -1260,7 +1259,7 @@ static const struct file_operations hung
> 		.read           = hung_up_tty_read,
> 		.write          = hung_up_tty_write,
> 		.poll           = hung_up_tty_poll,
> 	-       .ioctl          = hung_up_tty_ioctl,
> 	+       .unlocked_ioctl = hung_up_tty_ioctl,
> 		.compat_ioctl   = hung_up_tty_compat_ioctl,
> 		.release        = tty_release,
> 	 };
> 
> chunk.

This would result in unpredictable behaviour. If I left locking apart, ioctl 
prototype != unlocked_ioctl prototype.
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