1 files changed, 152 insertions, 26 deletions

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 900af5964f55..646ab9d15e42 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -19,6 +19,7 @@
 #include <linux/idr.h>
 #include <linux/workqueue.h>
 #include <linux/xattr.h>
+#include <linux/fs.h>
 
 #ifdef CONFIG_CGROUPS
 
@@ -30,10 +31,6 @@ struct css_id;
 
 extern int cgroup_init_early(void);
 extern int cgroup_init(void);
-extern void cgroup_lock(void);
-extern int cgroup_lock_is_held(void);
-extern bool cgroup_lock_live_group(struct cgroup *cgrp);
-extern void cgroup_unlock(void);
 extern void cgroup_fork(struct task_struct *p);
 extern void cgroup_post_fork(struct task_struct *p);
 extern void cgroup_exit(struct task_struct *p, int run_callbacks);
@@ -44,14 +41,25 @@ extern void cgroup_unload_subsys(struct cgroup_subsys *ss);
 
 extern const struct file_operations proc_cgroup_operations;
 
-/* Define the enumeration of all builtin cgroup subsystems */
+/*
+ * Define the enumeration of all cgroup subsystems.
+ *
+ * We define ids for builtin subsystems and then modular ones.
+ */
 #define SUBSYS(_x) _x ## _subsys_id,
-#define IS_SUBSYS_ENABLED(option) IS_ENABLED(option)
 enum cgroup_subsys_id {
+#define IS_SUBSYS_ENABLED(option) IS_BUILTIN(option)
 #include <linux/cgroup_subsys.h>
+#undef IS_SUBSYS_ENABLED
+        CGROUP_BUILTIN_SUBSYS_COUNT,
+
+        __CGROUP_SUBSYS_TEMP_PLACEHOLDER = CGROUP_BUILTIN_SUBSYS_COUNT - 1,
+
+#define IS_SUBSYS_ENABLED(option) IS_MODULE(option)
+#include <linux/cgroup_subsys.h>
+#undef IS_SUBSYS_ENABLED
         CGROUP_SUBSYS_COUNT,
 };
-#undef IS_SUBSYS_ENABLED
 #undef SUBSYS
 
 /* Per-subsystem/per-cgroup state maintained by the system. */
@@ -148,6 +156,13 @@ enum {
          * specified at mount time and thus is implemented here.
          */
         CGRP_CPUSET_CLONE_CHILDREN,
+        /* see the comment above CGRP_ROOT_SANE_BEHAVIOR for details */
+        CGRP_SANE_BEHAVIOR,
+};
+
+struct cgroup_name {
+        struct rcu_head rcu_head;
+        char name[];
 };
 
 struct cgroup {
@@ -172,11 +187,23 @@ struct cgroup {
         struct cgroup *parent;          /* my parent */
         struct dentry *dentry;          /* cgroup fs entry, RCU protected */
 
+        /*
+         * This is a copy of dentry->d_name, and it's needed because
+         * we can't use dentry->d_name in cgroup_path().
+         *
+         * You must acquire rcu_read_lock() to access cgrp->name, and
+         * the only place that can change it is rename(), which is
+         * protected by parent dir's i_mutex.
+         *
+         * Normally you should use cgroup_name() wrapper rather than
+         * access it directly.
+         */
+        struct cgroup_name __rcu *name;
+
         /* Private pointers for each registered subsystem */
         struct cgroup_subsys_state *subsys[CGROUP_SUBSYS_COUNT];
 
         struct cgroupfs_root *root;
-        struct cgroup *top_cgroup;
 
         /*
          * List of cg_cgroup_links pointing at css_sets with
@@ -213,6 +240,96 @@ struct cgroup {
         struct simple_xattrs xattrs;
 };
 
+#define MAX_CGROUP_ROOT_NAMELEN 64
+
+/* cgroupfs_root->flags */
+enum {
+        /*
+         * Unfortunately, cgroup core and various controllers are riddled
+         * with idiosyncrasies and pointless options.  The following flag,
+         * when set, will force sane behavior - some options are forced on,
+         * others are disallowed, and some controllers will change their
+         * hierarchical or other behaviors.
+         *
+         * The set of behaviors affected by this flag are still being
+         * determined and developed and the mount option for this flag is
+         * prefixed with __DEVEL__.  The prefix will be dropped once we
+         * reach the point where all behaviors are compatible with the
+         * planned unified hierarchy, which will automatically turn on this
+         * flag.
+         *
+         * The followings are the behaviors currently affected this flag.
+         *
+         * - Mount options "noprefix" and "clone_children" are disallowed.
+         *   Also, cgroupfs file cgroup.clone_children is not created.
+         *
+         * - When mounting an existing superblock, mount options should
+         *   match.
+         *
+         * - Remount is disallowed.
+         *
+         * - memcg: use_hierarchy is on by default and the cgroup file for
+         *   the flag is not created.
+         *
+         * The followings are planned changes.
+         *
+         * - release_agent will be disallowed once replacement notification
+         *   mechanism is implemented.
+         */
+        CGRP_ROOT_SANE_BEHAVIOR = (1 << 0),
+
+        CGRP_ROOT_NOPREFIX      = (1 << 1), /* mounted subsystems have no named prefix */
+        CGRP_ROOT_XATTR         = (1 << 2), /* supports extended attributes */
+};
+
+/*
+ * A cgroupfs_root represents the root of a cgroup hierarchy, and may be
+ * associated with a superblock to form an active hierarchy.  This is
+ * internal to cgroup core.  Don't access directly from controllers.
+ */
+struct cgroupfs_root {
+        struct super_block *sb;
+
+        /*
+         * The bitmask of subsystems intended to be attached to this
+         * hierarchy
+         */
+        unsigned long subsys_mask;
+
+        /* Unique id for this hierarchy. */
+        int hierarchy_id;
+
+        /* The bitmask of subsystems currently attached to this hierarchy */
+        unsigned long actual_subsys_mask;
+
+        /* A list running through the attached subsystems */
+        struct list_head subsys_list;
+
+        /* The root cgroup for this hierarchy */
+        struct cgroup top_cgroup;
+
+        /* Tracks how many cgroups are currently defined in hierarchy.*/
+        int number_of_cgroups;
+
+        /* A list running through the active hierarchies */
+        struct list_head root_list;
+
+        /* All cgroups on this root, cgroup_mutex protected */
+        struct list_head allcg_list;
+
+        /* Hierarchy-specific flags */
+        unsigned long flags;
+
+        /* IDs for cgroups in this hierarchy */
+        struct ida cgroup_ida;
+
+        /* The path to use for release notifications. */
+        char release_agent_path[PATH_MAX];
+
+        /* The name for this hierarchy - may be empty */
+        char name[MAX_CGROUP_ROOT_NAMELEN];
+};
+
 /*
  * A css_set is a structure holding pointers to a set of
  * cgroup_subsys_state objects. This saves space in the task struct
@@ -278,6 +395,7 @@ struct cgroup_map_cb {
 /* cftype->flags */
 #define CFTYPE_ONLY_ON_ROOT     (1U << 0)       /* only create on root cg */
 #define CFTYPE_NOT_ON_ROOT      (1U << 1)       /* don't create on root cg */
+#define CFTYPE_INSANE           (1U << 2)       /* don't create if sane_behavior */
 
 #define MAX_CFTYPE_NAME         64
 
@@ -304,9 +422,6 @@ struct cftype {
         /* CFTYPE_* flags */
         unsigned int flags;
 
-        /* file xattrs */
-        struct simple_xattrs xattrs;
-
         int (*open)(struct inode *inode, struct file *file);
         ssize_t (*read)(struct cgroup *cgrp, struct cftype *cft,
                         struct file *file,
@@ -404,18 +519,31 @@ struct cgroup_scanner {
         void *data;
 };
 
+/*
+ * See the comment above CGRP_ROOT_SANE_BEHAVIOR for details.  This
+ * function can be called as long as @cgrp is accessible.
+ */
+static inline bool cgroup_sane_behavior(const struct cgroup *cgrp)
+{
+        return cgrp->root->flags & CGRP_ROOT_SANE_BEHAVIOR;
+}
+
+/* Caller should hold rcu_read_lock() */
+static inline const char *cgroup_name(const struct cgroup *cgrp)
+{
+        return rcu_dereference(cgrp->name)->name;
+}
+
 int cgroup_add_cftypes(struct cgroup_subsys *ss, struct cftype *cfts);
 int cgroup_rm_cftypes(struct cgroup_subsys *ss, struct cftype *cfts);
 
 int cgroup_is_removed(const struct cgroup *cgrp);
+bool cgroup_is_descendant(struct cgroup *cgrp, struct cgroup *ancestor);
 
 int cgroup_path(const struct cgroup *cgrp, char *buf, int buflen);
 
 int cgroup_task_count(const struct cgroup *cgrp);
 
-/* Return true if cgrp is a descendant of the task's cgroup */
-int cgroup_is_descendant(const struct cgroup *cgrp, struct task_struct *task);
-
 /*
  * Control Group taskset, used to pass around set of tasks to cgroup_subsys
  * methods.
@@ -458,7 +586,6 @@ struct cgroup_subsys {
         void (*bind)(struct cgroup *root);
 
         int subsys_id;
-        int active;
         int disabled;
         int early_init;
         /*
@@ -523,10 +650,16 @@ static inline struct cgroup_subsys_state *cgroup_subsys_state(
  * rcu_dereference_check() conditions, such as locks used during the
  * cgroup_subsys::attach() methods.
  */
+#ifdef CONFIG_PROVE_RCU
+extern struct mutex cgroup_mutex;
 #define task_subsys_state_check(task, subsys_id, __c)                   \
-        rcu_dereference_check(task->cgroups->subsys[subsys_id],         \
-                              lockdep_is_held(&task->alloc_lock) ||     \
-                              cgroup_lock_is_held() || (__c))
+        rcu_dereference_check((task)->cgroups->subsys[(subsys_id)],     \
+                              lockdep_is_held(&(task)->alloc_lock) ||   \
+                              lockdep_is_held(&cgroup_mutex) || (__c))
+#else
+#define task_subsys_state_check(task, subsys_id, __c)                   \
+        rcu_dereference((task)->cgroups->subsys[(subsys_id)])
+#endif
 
 static inline struct cgroup_subsys_state *
 task_subsys_state(struct task_struct *task, int subsys_id)
@@ -661,8 +794,8 @@ struct task_struct *cgroup_iter_next(struct cgroup *cgrp,
                                         struct cgroup_iter *it);
 void cgroup_iter_end(struct cgroup *cgrp, struct cgroup_iter *it);
 int cgroup_scan_tasks(struct cgroup_scanner *scan);
-int cgroup_attach_task(struct cgroup *, struct task_struct *);
 int cgroup_attach_task_all(struct task_struct *from, struct task_struct *);
+int cgroup_transfer_tasks(struct cgroup *to, struct cgroup *from);
 
 /*
  * CSS ID is ID for cgroup_subsys_state structs under subsys. This only works
@@ -687,13 +820,6 @@ void free_css_id(struct cgroup_subsys *ss, struct cgroup_subsys_state *css);
 
 struct cgroup_subsys_state *css_lookup(struct cgroup_subsys *ss, int id);
 
-/*
- * Get a cgroup whose id is greater than or equal to id under tree of root.
- * Returning a cgroup_subsys_state or NULL.
- */
-struct cgroup_subsys_state *css_get_next(struct cgroup_subsys *ss, int id,
-                struct cgroup_subsys_state *root, int *foundid);
-
 /* Returns true if root is ancestor of cg */
 bool css_is_ancestor(struct cgroup_subsys_state *cg,
                      const struct cgroup_subsys_state *root);