CGroup API files: move "releasable" to cgroup_debug subsystem

The "releasable" control file provided by the cgroup framework exports the
state of a per-cgroup flag that's related to the notify-on-release feature.
This isn't really generally useful, unless you're trying to debug this
particular feature of cgroups.

This patch moves the "releasable" file to the cgroup_debug subsystem.

Signed-off-by: Paul Menage <menage@google.com>
Cc: "Li Zefan" <lizf@cn.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Paul Jackson <pj@sgi.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: "YAMAMOTO Takashi" <yamamoto@valinux.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 0a3ab670dd2..b40fd5ee9a7 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -88,6 +88,17 @@ static inline void css_put(struct cgroup_subsys_state *css)
                 __css_put(css);
 }
 
+/* bits in struct cgroup flags field */
+enum {
+        /* Control Group is dead */
+        CGRP_REMOVED,
+        /* Control Group has previously had a child cgroup or a task,
+         * but no longer (only if CGRP_NOTIFY_ON_RELEASE is set) */
+        CGRP_RELEASABLE,
+        /* Control Group requires release notifications to userspace */
+        CGRP_NOTIFY_ON_RELEASE,
+};
+
 struct cgroup {
         unsigned long flags;            /* "unsigned long" so bitops work */