1 files changed, 17 insertions, 0 deletions

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index be81fafae11f..565c8034e6c8 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -16,6 +16,7 @@
 #include <linux/prio_heap.h>
 #include <linux/rwsem.h>
 #include <linux/idr.h>
+#include <linux/workqueue.h>
 
 #ifdef CONFIG_CGROUPS
 
@@ -76,12 +77,16 @@ struct cgroup_subsys_state {
         unsigned long flags;
         /* ID for this css, if possible */
         struct css_id __rcu *id;
+
+        /* Used to put @cgroup->dentry on the last css_put() */
+        struct work_struct dput_work;
 };
 
 /* bits in struct cgroup_subsys_state flags field */
 enum {
         CSS_ROOT, /* This CSS is the root of the subsystem */
         CSS_REMOVED, /* This CSS is dead */
+        CSS_CLEAR_CSS_REFS,             /* @ss->__DEPRECATED_clear_css_refs */
 };
 
 /* Caller must verify that the css is not for root cgroup */
@@ -480,6 +485,18 @@ struct cgroup_subsys {
          * (not available in early_init time.)
          */
         bool use_id;
+
+        /*
+         * If %true, cgroup removal will try to clear css refs by retrying
+         * ss->pre_destroy() until there's no css ref left.  This behavior
+         * is strictly for backward compatibility and will be removed as
+         * soon as the current user (memcg) is updated.
+         *
+         * If %false, ss->pre_destroy() can't fail and cgroup removal won't
+         * wait for css refs to drop to zero before proceeding.
+         */
+        bool __DEPRECATED_clear_css_refs;
+
 #define MAX_CGROUP_TYPE_NAMELEN 32
         const char *name;