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>

3 files changed, 22 insertions, 24 deletions

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 0a3ab670dd2f..b40fd5ee9a76 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 */
 
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 693bcc03188b..b5ef0c4772f7 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -119,17 +119,6 @@ static int root_count;
  */
 static int need_forkexit_callback;
 
-/* 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,
-};
-
 /* convenient tests for these bits */
 inline int cgroup_is_removed(const struct cgroup *cgrp)
 {
@@ -1307,7 +1296,6 @@ enum cgroup_filetype {
         FILE_DIR,
         FILE_TASKLIST,
         FILE_NOTIFY_ON_RELEASE,
-        FILE_RELEASABLE,
         FILE_RELEASE_AGENT,
 };
 
@@ -2186,11 +2174,6 @@ static u64 cgroup_read_notify_on_release(struct cgroup *cgrp,
         return notify_on_release(cgrp);
 }
 
-static u64 cgroup_read_releasable(struct cgroup *cgrp, struct cftype *cft)
-{
-        return test_bit(CGRP_RELEASABLE, &cgrp->flags);
-}
-
 /*
  * for the common functions, 'private' gives the type of file
  */
@@ -2210,12 +2193,6 @@ static struct cftype files[] = {
                 .write = cgroup_common_file_write,
                 .private = FILE_NOTIFY_ON_RELEASE,
         },
-
-        {
-                .name = "releasable",
-                .read_u64 = cgroup_read_releasable,
-                .private = FILE_RELEASABLE,
-        }
 };
 
 static struct cftype cft_release_agent = {
diff --git a/kernel/cgroup_debug.c b/kernel/cgroup_debug.c
index cbb7a26f4ea3..c3dc3aba4c02 100644
--- a/kernel/cgroup_debug.c
+++ b/kernel/cgroup_debug.c
@@ -1,5 +1,5 @@
 /*
- * kernel/ccontainer_debug.c - Example cgroup subsystem that
+ * kernel/cgroup_debug.c - Example cgroup subsystem that
  * exposes debug info
  *
  * Copyright (C) Google Inc, 2007
@@ -62,6 +62,11 @@ static u64 current_css_set_refcount_read(struct cgroup *cont,
         return count;
 }
 
+static u64 releasable_read(struct cgroup *cgrp, struct cftype *cft)
+{
+        return test_bit(CGRP_RELEASABLE, &cgrp->flags);
+}
+
 static struct cftype files[] =  {
         {
                 .name = "cgroup_refcount",
@@ -81,6 +86,11 @@ static struct cftype files[] =  {
                 .name = "current_css_set_refcount",
                 .read_u64 = current_css_set_refcount_read,
         },
+
+        {
+                .name = "releasable",
+                .read_u64 = releasable_read,
+        }
 };
 
 static int debug_populate(struct cgroup_subsys *ss, struct cgroup *cont)