1
2#ifndef __CGROUP_INTERNAL_H
3#define __CGROUP_INTERNAL_H
4
5#include <linux/cgroup.h>
6#include <linux/kernfs.h>
7#include <linux/workqueue.h>
8#include <linux/list.h>
9#include <linux/refcount.h>
10#include <linux/fs_parser.h>
11
12#define TRACE_CGROUP_PATH_LEN 1024
13extern spinlock_t trace_cgroup_path_lock;
14extern char trace_cgroup_path[TRACE_CGROUP_PATH_LEN];
15extern bool cgroup_debug;
16extern void __init enable_debug_cgroup(void);
17
18
19
20
21
22
23
24
25
26
27
28#define TRACE_CGROUP_PATH(type, cgrp, ...) \
29 do { \
30 if (trace_cgroup_##type##_enabled()) { \
31 unsigned long flags; \
32 spin_lock_irqsave(&trace_cgroup_path_lock, \
33 flags); \
34 cgroup_path(cgrp, trace_cgroup_path, \
35 TRACE_CGROUP_PATH_LEN); \
36 trace_cgroup_##type(cgrp, trace_cgroup_path, \
37 ##__VA_ARGS__); \
38 spin_unlock_irqrestore(&trace_cgroup_path_lock, \
39 flags); \
40 } \
41 } while (0)
42
43
44
45
46struct cgroup_fs_context {
47 struct kernfs_fs_context kfc;
48 struct cgroup_root *root;
49 struct cgroup_namespace *ns;
50 unsigned int flags;
51
52
53 bool cpuset_clone_children;
54 bool none;
55 bool all_ss;
56 u16 subsys_mask;
57 char *name;
58 char *release_agent;
59};
60
61static inline struct cgroup_fs_context *cgroup_fc2context(struct fs_context *fc)
62{
63 struct kernfs_fs_context *kfc = fc->fs_private;
64
65 return container_of(kfc, struct cgroup_fs_context, kfc);
66}
67
68
69
70
71
72
73
74
75
76struct cgrp_cset_link {
77
78 struct cgroup *cgrp;
79 struct css_set *cset;
80
81
82 struct list_head cset_link;
83
84
85 struct list_head cgrp_link;
86};
87
88
89struct cgroup_taskset {
90
91 struct list_head src_csets;
92 struct list_head dst_csets;
93
94
95 int nr_tasks;
96
97
98 int ssid;
99
100
101
102
103
104
105
106
107
108
109
110
111 struct list_head *csets;
112 struct css_set *cur_cset;
113 struct task_struct *cur_task;
114};
115
116
117struct cgroup_mgctx {
118
119
120
121
122 struct list_head preloaded_src_csets;
123 struct list_head preloaded_dst_csets;
124
125
126 struct cgroup_taskset tset;
127
128
129 u16 ss_mask;
130};
131
132#define CGROUP_TASKSET_INIT(tset) \
133{ \
134 .src_csets = LIST_HEAD_INIT(tset.src_csets), \
135 .dst_csets = LIST_HEAD_INIT(tset.dst_csets), \
136 .csets = &tset.src_csets, \
137}
138
139#define CGROUP_MGCTX_INIT(name) \
140{ \
141 LIST_HEAD_INIT(name.preloaded_src_csets), \
142 LIST_HEAD_INIT(name.preloaded_dst_csets), \
143 CGROUP_TASKSET_INIT(name.tset), \
144}
145
146#define DEFINE_CGROUP_MGCTX(name) \
147 struct cgroup_mgctx name = CGROUP_MGCTX_INIT(name)
148
149extern struct mutex cgroup_mutex;
150extern spinlock_t css_set_lock;
151extern struct cgroup_subsys *cgroup_subsys[];
152extern struct list_head cgroup_roots;
153extern struct file_system_type cgroup_fs_type;
154
155
156#define for_each_root(root) \
157 list_for_each_entry((root), &cgroup_roots, root_list)
158
159
160
161
162
163
164#define for_each_subsys(ss, ssid) \
165 for ((ssid) = 0; (ssid) < CGROUP_SUBSYS_COUNT && \
166 (((ss) = cgroup_subsys[ssid]) || true); (ssid)++)
167
168static inline bool cgroup_is_dead(const struct cgroup *cgrp)
169{
170 return !(cgrp->self.flags & CSS_ONLINE);
171}
172
173static inline bool notify_on_release(const struct cgroup *cgrp)
174{
175 return test_bit(CGRP_NOTIFY_ON_RELEASE, &cgrp->flags);
176}
177
178void put_css_set_locked(struct css_set *cset);
179
180static inline void put_css_set(struct css_set *cset)
181{
182 unsigned long flags;
183
184
185
186
187
188
189 if (refcount_dec_not_one(&cset->refcount))
190 return;
191
192 spin_lock_irqsave(&css_set_lock, flags);
193 put_css_set_locked(cset);
194 spin_unlock_irqrestore(&css_set_lock, flags);
195}
196
197
198
199
200static inline void get_css_set(struct css_set *cset)
201{
202 refcount_inc(&cset->refcount);
203}
204
205bool cgroup_ssid_enabled(int ssid);
206bool cgroup_on_dfl(const struct cgroup *cgrp);
207bool cgroup_is_thread_root(struct cgroup *cgrp);
208bool cgroup_is_threaded(struct cgroup *cgrp);
209
210struct cgroup_root *cgroup_root_from_kf(struct kernfs_root *kf_root);
211struct cgroup *task_cgroup_from_root(struct task_struct *task,
212 struct cgroup_root *root);
213struct cgroup *cgroup_kn_lock_live(struct kernfs_node *kn, bool drain_offline);
214void cgroup_kn_unlock(struct kernfs_node *kn);
215int cgroup_path_ns_locked(struct cgroup *cgrp, char *buf, size_t buflen,
216 struct cgroup_namespace *ns);
217
218void cgroup_free_root(struct cgroup_root *root);
219void init_cgroup_root(struct cgroup_fs_context *ctx);
220int cgroup_setup_root(struct cgroup_root *root, u16 ss_mask);
221int rebind_subsystems(struct cgroup_root *dst_root, u16 ss_mask);
222int cgroup_do_get_tree(struct fs_context *fc);
223
224int cgroup_migrate_vet_dst(struct cgroup *dst_cgrp);
225void cgroup_migrate_finish(struct cgroup_mgctx *mgctx);
226void cgroup_migrate_add_src(struct css_set *src_cset, struct cgroup *dst_cgrp,
227 struct cgroup_mgctx *mgctx);
228int cgroup_migrate_prepare_dst(struct cgroup_mgctx *mgctx);
229int cgroup_migrate(struct task_struct *leader, bool threadgroup,
230 struct cgroup_mgctx *mgctx);
231
232int cgroup_attach_task(struct cgroup *dst_cgrp, struct task_struct *leader,
233 bool threadgroup);
234struct task_struct *cgroup_procs_write_start(char *buf, bool threadgroup,
235 bool *locked)
236 __acquires(&cgroup_threadgroup_rwsem);
237void cgroup_procs_write_finish(struct task_struct *task, bool locked)
238 __releases(&cgroup_threadgroup_rwsem);
239
240void cgroup_lock_and_drain_offline(struct cgroup *cgrp);
241
242int cgroup_mkdir(struct kernfs_node *parent_kn, const char *name, umode_t mode);
243int cgroup_rmdir(struct kernfs_node *kn);
244int cgroup_show_path(struct seq_file *sf, struct kernfs_node *kf_node,
245 struct kernfs_root *kf_root);
246
247int __cgroup_task_count(const struct cgroup *cgrp);
248int cgroup_task_count(const struct cgroup *cgrp);
249
250
251
252
253int cgroup_rstat_init(struct cgroup *cgrp);
254void cgroup_rstat_exit(struct cgroup *cgrp);
255void cgroup_rstat_boot(void);
256void cgroup_base_stat_cputime_show(struct seq_file *seq);
257
258
259
260
261extern const struct proc_ns_operations cgroupns_operations;
262
263
264
265
266extern struct cftype cgroup1_base_files[];
267extern struct kernfs_syscall_ops cgroup1_kf_syscall_ops;
268extern const struct fs_parameter_spec cgroup1_fs_parameters[];
269
270int proc_cgroupstats_show(struct seq_file *m, void *v);
271bool cgroup1_ssid_disabled(int ssid);
272void cgroup1_pidlist_destroy_all(struct cgroup *cgrp);
273void cgroup1_release_agent(struct work_struct *work);
274void cgroup1_check_for_release(struct cgroup *cgrp);
275int cgroup1_parse_param(struct fs_context *fc, struct fs_parameter *param);
276int cgroup1_get_tree(struct fs_context *fc);
277int cgroup1_reconfigure(struct fs_context *ctx);
278
279#endif
280