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Diffstat (limited to 'include/linux/cgroup.h')
-rw-r--r--include/linux/cgroup.h55
1 files changed, 46 insertions, 9 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 90bba9e6228..0008dee6651 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -37,7 +37,7 @@ extern void cgroup_exit(struct task_struct *p, int run_callbacks);
extern int cgroupstats_build(struct cgroupstats *stats,
struct dentry *dentry);
-extern struct file_operations proc_cgroup_operations;
+extern const struct file_operations proc_cgroup_operations;
/* Define the enumeration of all cgroup subsystems */
#define SUBSYS(_x) _x ## _subsys_id,
@@ -141,6 +141,38 @@ enum {
CGRP_WAIT_ON_RMDIR,
};
+/* which pidlist file are we talking about? */
+enum cgroup_filetype {
+ CGROUP_FILE_PROCS,
+ CGROUP_FILE_TASKS,
+};
+
+/*
+ * A pidlist is a list of pids that virtually represents the contents of one
+ * of the cgroup files ("procs" or "tasks"). We keep a list of such pidlists,
+ * a pair (one each for procs, tasks) for each pid namespace that's relevant
+ * to the cgroup.
+ */
+struct cgroup_pidlist {
+ /*
+ * used to find which pidlist is wanted. doesn't change as long as
+ * this particular list stays in the list.
+ */
+ struct { enum cgroup_filetype type; struct pid_namespace *ns; } key;
+ /* array of xids */
+ pid_t *list;
+ /* how many elements the above list has */
+ int length;
+ /* how many files are using the current array */
+ int use_count;
+ /* each of these stored in a list by its cgroup */
+ struct list_head links;
+ /* pointer to the cgroup we belong to, for list removal purposes */
+ struct cgroup *owner;
+ /* protects the other fields */
+ struct rw_semaphore mutex;
+};
+
struct cgroup {
unsigned long flags; /* "unsigned long" so bitops work */
@@ -179,11 +211,12 @@ struct cgroup {
*/
struct list_head release_list;
- /* pids_mutex protects pids_list and cached pid arrays. */
- struct rw_semaphore pids_mutex;
-
- /* Linked list of struct cgroup_pids */
- struct list_head pids_list;
+ /*
+ * list of pidlists, up to two for each namespace (one for procs, one
+ * for tasks); created on demand.
+ */
+ struct list_head pidlists;
+ struct mutex pidlist_mutex;
/* For RCU-protected deletion */
struct rcu_head rcu_head;
@@ -227,6 +260,9 @@ struct css_set {
* during subsystem registration (at boot time).
*/
struct cgroup_subsys_state *subsys[CGROUP_SUBSYS_COUNT];
+
+ /* For RCU-protected deletion */
+ struct rcu_head rcu_head;
};
/*
@@ -389,10 +425,11 @@ struct cgroup_subsys {
struct cgroup *cgrp);
int (*pre_destroy)(struct cgroup_subsys *ss, struct cgroup *cgrp);
void (*destroy)(struct cgroup_subsys *ss, struct cgroup *cgrp);
- int (*can_attach)(struct cgroup_subsys *ss,
- struct cgroup *cgrp, struct task_struct *tsk);
+ int (*can_attach)(struct cgroup_subsys *ss, struct cgroup *cgrp,
+ struct task_struct *tsk, bool threadgroup);
void (*attach)(struct cgroup_subsys *ss, struct cgroup *cgrp,
- struct cgroup *old_cgrp, struct task_struct *tsk);
+ struct cgroup *old_cgrp, struct task_struct *tsk,
+ bool threadgroup);
void (*fork)(struct cgroup_subsys *ss, struct task_struct *task);
void (*exit)(struct cgroup_subsys *ss, struct task_struct *task);
int (*populate)(struct cgroup_subsys *ss,