linux-kernel - [PATCH] cgroup mount: ignore nsroot=

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Date:	Wed, 30 Mar 2016 12:21:00 -0500
From:	"Serge E. Hallyn" <serge@...lyn.com>
To:	"Serge E. Hallyn" <serge@...lyn.com>
Cc:	Tycho Andersen <tycho.andersen@...onical.com>, tj@...nel.org,
	linux-api@...r.kernel.org, adityakali@...gle.com,
	Linux Containers <containers@...ts.osdl.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	cgroups@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH] cgroup mount: ignore nsroot=

As of the patch "cgroup namespaces: add a 'nsroot=' mountinfo field", 
cgroupfs mountinfo output shows 'nsroot='.  If userspace like criu
copy/pastes mount options from there into a new mount command, we should
ignore it.

Signed-off-by: Serge Hallyn <serge.hallyn@...ntu.com>
---
 kernel/cgroup.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index ef0c25d..69fb112 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1680,6 +1680,10 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
 			opts->none = true;
 			continue;
 		}
+		if (!strncmp(token, "nsroot=", 7)) {
+			/* ignore nsroot= copied from mountinfo */
+			continue;
+		}
 		if (!strcmp(token, "all")) {
 			/* Mutually exclusive option 'all' + subsystem name */
 			if (one_ss)
-- 
2.7.0