Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1757355Ab3HONC5 (ORCPT <rfc822;w@1wt.eu>);
	Thu, 15 Aug 2013 09:02:57 -0400
Received: from vorash.stgraber.org ([176.9.111.221]:35392 "EHLO
	smtpout.stgraber.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1756305Ab3HONBr (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Thu, 15 Aug 2013 09:01:47 -0400
X-Greylist: delayed 606 seconds by postgrey-1.27 at vger.kernel.org; Thu, 15 Aug 2013 09:01:47 EDT
Date: Thu, 15 Aug 2013 14:51:32 +0200
From: =?iso-8859-1?Q?St=E9phane?= Graber <stgraber@ubuntu.com>
To: linux-kernel@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org, Alexander Viro <viro@zeniv.linux.org.uk>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        Serge Hallyn <serge.hallyn@canonical.com>,
        Andy Whitcroft <apw@canonical.com>
Subject: [RESEND] [PATCH] coredump: Add new %P variable in core_pattern
Message-ID: <20130815125132.GA11139@castiana>
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
X-Mailer: git-send-email 1.8.1.2
User-Agent: Mutt/1.5.21 (2010-09-15)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
Content-Length: 2023
Lines: 57

This adds a new %P variable to be used in core_pattern. This variable contains
the global PID (PID in the init namespace) as %p contains the PID in the
current namespace which isn't always what we want.

The main use for this is to make it easier to handle crashes that happened
within a container. With that new variables it's possible to have the crashes
dumped into the container or forwarded to the host with the right PID
(from the host's point of view).

Reported-by: Hans Feldt <hans.feldt@ericsson.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Andy Whitcroft <apw@canonical.com>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>
Signed-off-by: St?phane Graber <stgraber@ubuntu.com>

---
 Documentation/sysctl/kernel.txt | 1 +
 fs/coredump.c                   | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index ccd4258..833026d 100644
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -182,6 +182,7 @@ core_pattern is used to specify a core dumpfile pattern name.
 	%<NUL>	'%' is dropped
 	%%	output one '%'
 	%p	pid
+	%P	global pid (init PID namespace)
 	%u	uid
 	%g	gid
 	%d	dump mode, matches PR_SET_DUMPABLE and
diff --git a/fs/coredump.c b/fs/coredump.c
index c647965..528c6fc 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -186,6 +186,11 @@ static int format_corename(struct core_name *cn, struct coredump_params *cprm)
 				err = cn_printf(cn, "%d",
 					      task_tgid_vnr(current));
 				break;
+			/* global pid */
+			case 'P':
+				err = cn_printf(cn, "%d",
+					      task_tgid_nr(current));
+				break;
 			/* uid */
 			case 'u':
 				err = cn_printf(cn, "%d", cred->uid);
-- 
1.8.1.2

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/