linux-kernel - [PATCH 3/3] /proc/pid/status: show all sets of pid according to ns

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Message-ID: <1409740200-26461-4-git-send-email-chenhanxiao@cn.fujitsu.com>
Date:	Wed, 3 Sep 2014 18:30:00 +0800
From:	Chen Hanxiao <chenhanxiao@...fujitsu.com>
To:	<containers@...ts.linux-foundation.org>,
	<linux-kernel@...r.kernel.org>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	David Howells <dhowells@...hat.com>,
	Richard Weinberger <richard.weinberger@...il.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Vasiliy Kulikov <segooon@...il.com>
Subject: [PATCH 3/3] /proc/pid/status: show all sets of pid according to ns

If some issues occurred inside a container guest, host user
could not know which process is in trouble just by guest pid:
the users of container guest only knew the pid inside containers.
This will bring obstacle for trouble shooting.

This patch adds four fields: NStgid, NSpid, NSpgid and NSsid:
a) In init_pid_ns, nothing changed;

b) In one pidns, will tell the pid inside containers:
NStgid:	21776 	5 	1
NSpid:	21776 	5 	1
NSpgid:	21776 	5 	1
NSsid:	21729 	1 	0
** Process id is 21776 in level 0, 5 in level 1, 1 in level 2.

c) If pidns is nested, it depends on which pidns are you in.
NStgid:	5 	1
NSpid:	5 	1
NSpgid:	5 	1
NSsid:	1 	0
** Views from level 1

v2: add two new fields: NStgid and NSpid.
    keep fields of Tgid and Pid unchanged for back compatibility.
v3: add another two fields: NSpgid and NSsid.

Signed-off-by: Chen Hanxiao <chenhanxiao@...fujitsu.com>
---
 fs/proc/array.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/fs/proc/array.c b/fs/proc/array.c
index cd3653e..c30875d 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -193,6 +193,23 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
 		from_kgid_munged(user_ns, cred->egid),
 		from_kgid_munged(user_ns, cred->sgid),
 		from_kgid_munged(user_ns, cred->fsgid));
+	seq_puts(m, "NStgid:");
+	for (g = ns->level; g <= pid->level; g++)
+		seq_printf(m, "\t%d ",
+			task_tgid_nr_ns(p, pid->numbers[g].ns));
+	seq_puts(m, "\nNSpid:");
+	for (g = ns->level; g <= pid->level; g++)
+		seq_printf(m, "\t%d ",
+			task_pid_nr_ns(p, pid->numbers[g].ns));
+	seq_puts(m, "\nNSpgid:");
+	for (g = ns->level; g <= pid->level; g++)
+		seq_printf(m, "\t%d ",
+			task_pgrp_nr_ns(p, pid->numbers[g].ns));
+	seq_puts(m, "\nNSsid:");
+	for (g = ns->level; g <= pid->level; g++)
+		seq_printf(m, "\t%d ",
+			task_session_nr_ns(p, pid->numbers[g].ns));
+	seq_putc(m, '\n');
 
 	task_lock(p);
 	if (p->files)
-- 
1.9.0

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