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-rw-r--r--include/linux/cgroup-defs.h70
1 files changed, 38 insertions, 32 deletions
diff --git a/include/linux/cgroup-defs.h b/include/linux/cgroup-defs.h
index 861b4677fc5b..6a3f850cabab 100644
--- a/include/linux/cgroup-defs.h
+++ b/include/linux/cgroup-defs.h
@@ -148,14 +148,18 @@ struct cgroup_subsys_state {
* set for a task.
*/
struct css_set {
- /* Reference count */
- atomic_t refcount;
-
/*
- * List running through all cgroup groups in the same hash
- * slot. Protected by css_set_lock
+ * Set of subsystem states, one for each subsystem. This array is
+ * immutable after creation apart from the init_css_set during
+ * subsystem registration (at boot time).
*/
- struct hlist_node hlist;
+ struct cgroup_subsys_state *subsys[CGROUP_SUBSYS_COUNT];
+
+ /* reference count */
+ atomic_t refcount;
+
+ /* the default cgroup associated with this css_set */
+ struct cgroup *dfl_cgrp;
/*
* Lists running through all tasks using this cgroup group.
@@ -167,21 +171,29 @@ struct css_set {
struct list_head tasks;
struct list_head mg_tasks;
+ /* all css_task_iters currently walking this cset */
+ struct list_head task_iters;
+
/*
- * List of cgrp_cset_links pointing at cgroups referenced from this
- * css_set. Protected by css_set_lock.
+ * On the default hierarhcy, ->subsys[ssid] may point to a css
+ * attached to an ancestor instead of the cgroup this css_set is
+ * associated with. The following node is anchored at
+ * ->subsys[ssid]->cgroup->e_csets[ssid] and provides a way to
+ * iterate through all css's attached to a given cgroup.
*/
- struct list_head cgrp_links;
+ struct list_head e_cset_node[CGROUP_SUBSYS_COUNT];
- /* the default cgroup associated with this css_set */
- struct cgroup *dfl_cgrp;
+ /*
+ * List running through all cgroup groups in the same hash
+ * slot. Protected by css_set_lock
+ */
+ struct hlist_node hlist;
/*
- * Set of subsystem states, one for each subsystem. This array is
- * immutable after creation apart from the init_css_set during
- * subsystem registration (at boot time).
+ * List of cgrp_cset_links pointing at cgroups referenced from this
+ * css_set. Protected by css_set_lock.
*/
- struct cgroup_subsys_state *subsys[CGROUP_SUBSYS_COUNT];
+ struct list_head cgrp_links;
/*
* List of csets participating in the on-going migration either as
@@ -201,18 +213,6 @@ struct css_set {
struct cgroup *mg_dst_cgrp;
struct css_set *mg_dst_cset;
- /*
- * On the default hierarhcy, ->subsys[ssid] may point to a css
- * attached to an ancestor instead of the cgroup this css_set is
- * associated with. The following node is anchored at
- * ->subsys[ssid]->cgroup->e_csets[ssid] and provides a way to
- * iterate through all css's attached to a given cgroup.
- */
- struct list_head e_cset_node[CGROUP_SUBSYS_COUNT];
-
- /* all css_task_iters currently walking this cset */
- struct list_head task_iters;
-
/* dead and being drained, ignore for migration */
bool dead;
@@ -388,6 +388,9 @@ struct cftype {
struct list_head node; /* anchored at ss->cfts */
struct kernfs_ops *kf_ops;
+ int (*open)(struct kernfs_open_file *of);
+ void (*release)(struct kernfs_open_file *of);
+
/*
* read_u64() is a shortcut for the common case of returning a
* single integer. Use it in place of read()
@@ -528,8 +531,8 @@ extern struct percpu_rw_semaphore cgroup_threadgroup_rwsem;
* cgroup_threadgroup_change_begin - threadgroup exclusion for cgroups
* @tsk: target task
*
- * Called from threadgroup_change_begin() and allows cgroup operations to
- * synchronize against threadgroup changes using a percpu_rw_semaphore.
+ * Allows cgroup operations to synchronize against threadgroup changes
+ * using a percpu_rw_semaphore.
*/
static inline void cgroup_threadgroup_change_begin(struct task_struct *tsk)
{
@@ -540,8 +543,7 @@ static inline void cgroup_threadgroup_change_begin(struct task_struct *tsk)
* cgroup_threadgroup_change_end - threadgroup exclusion for cgroups
* @tsk: target task
*
- * Called from threadgroup_change_end(). Counterpart of
- * cgroup_threadcgroup_change_begin().
+ * Counterpart of cgroup_threadcgroup_change_begin().
*/
static inline void cgroup_threadgroup_change_end(struct task_struct *tsk)
{
@@ -552,7 +554,11 @@ static inline void cgroup_threadgroup_change_end(struct task_struct *tsk)
#define CGROUP_SUBSYS_COUNT 0
-static inline void cgroup_threadgroup_change_begin(struct task_struct *tsk) {}
+static inline void cgroup_threadgroup_change_begin(struct task_struct *tsk)
+{
+ might_sleep();
+}
+
static inline void cgroup_threadgroup_change_end(struct task_struct *tsk) {}
#endif /* CONFIG_CGROUPS */