Another spin for CGroup Namespaces feature.
Changes from V2:
1. Added documentation in Documentation/cgroups/namespace.txt
2. Fixed a bug that caused crash
3. Incorporated some other suggestions from last patchset:
- removed use of threadgroup_lock() while creating new cgroupns
- use task_lock() instead of rcu_read_lock() while accessing
task->nsproxy
- optimized setns() to own cgroupns
- simplified code around sane-behavior mount option parsing
4. Restored ACKs from Serge Hallyn from v1 on few patches that have
not changed since then.
Changes from V1:
1. No pinning of processes within cgroupns. Tasks can be freely moved
across cgroups even outside of their cgroupns-root. Usual DAC/MAC policies
apply as before.
2. Path in /proc/<pid>/cgroup is now always shown and is relative to
cgroupns-root. So path can contain '/..' strings depending on cgroupns-root
of the reader and cgroup of <pid>.
3. setns() does not require the process to first move under target
cgroupns-root.
Changes form RFC (V0):
1. setns support for cgroupns
2. 'mount -t cgroup cgroup <mntpt>' from inside a cgroupns now
mounts the cgroup hierarcy with cgroupns-root as the filesystem root.
3. writes to cgroup files outside of cgroupns-root are not allowed
4. visibility of /proc/<pid>/cgroup is further restricted by not showing
anything if the <pid> is in a sibling cgroupns and its cgroup falls outside
your cgroupns-root.
---
Documentation/cgroups/namespace.txt | 147 +++++++++++++++++++++++++++
fs/kernfs/dir.c | 195 ++++++++++++++++++++++++++++++++----
fs/kernfs/mount.c | 48 +++++++++
fs/proc/namespaces.c | 1 +
include/linux/cgroup.h | 52 +++++++++-
include/linux/cgroup_namespace.h | 36 +++++++
include/linux/kernfs.h | 5 +
include/linux/nsproxy.h | 2 +
include/linux/proc_ns.h | 4 +
include/uapi/linux/sched.h | 3 +-
kernel/Makefile | 2 +-
kernel/cgroup.c | 106 +++++++++++++++-----
kernel/cgroup_namespace.c | 140 ++++++++++++++++++++++++++
kernel/fork.c | 2 +-
kernel/nsproxy.c | 19 +++-
15 files changed, 711 insertions(+), 51 deletions(-)
create mode 100644 Documentation/cgroups/namespace.txt
create mode 100644 include/linux/cgroup_namespace.h
create mode 100644 kernel/cgroup_namespace.c
[PATCHv3 1/8] kernfs: Add API to generate relative kernfs path
[PATCHv3 2/8] sched: new clone flag CLONE_NEWCGROUP for cgroup
[PATCHv3 3/8] cgroup: add function to get task's cgroup on default
[PATCHv3 4/8] cgroup: export cgroup_get() and cgroup_put()
[PATCHv3 5/8] cgroup: introduce cgroup namespaces
[PATCHv3 6/8] cgroup: cgroup namespace setns support
[PATCHv3 7/8] cgroup: mount cgroupns-root when inside non-init cgroupns
[PATCHv3 8/8] cgroup: Add documentation for cgroup namespaces
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