Show virtualized dentry root in mountinfo for cgroupfs

serge.hallyn at serge.hallyn at
Sun Apr 17 20:04:30 UTC 2016

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.

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