linux-kernel - Show virtualized dentry root in mountinfo for cgroupfs

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Message-Id: <1460923472-29370-1-git-send-email-serge.hallyn@ubuntu.com>
Date:	Sun, 17 Apr 2016 15:04:30 -0500
From:	serge.hallyn@...ntu.com
To:	linux-kernel@...r.kernel.org
Cc:	adityakali@...gle.com, tj@...nel.org, linux-api@...r.kernel.org,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	akpm@...ux-foundation.org, ebiederm@...ssion.com,
	gregkh@...uxfoundation.org, lizefan@...wei.com, hannes@...xchg.org
Subject: Show virtualized dentry root in mountinfo for cgroupfs

With the current cgroup namespace patches, the root dentry path of a
mount as shown in /proc/self/mountinfo is the full global cgroup
path.  It is common for userspace to use /proc/self/mountinfo to
search for cgroup mountpoints, and expect the root dentry path to
relate to the cgroup paths in /proc/self/cgroup.  Patch 2 in this
set therefore virtualizes the root dentry path relative to the
reader's cgroup namespace root.

Patch 1 fixes a bug in kernfs_path_from_node_locked() which is
exposed by patch 2.