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ddbcc7e8 PM |
1 | #ifndef _LINUX_CGROUP_H |
2 | #define _LINUX_CGROUP_H | |
3 | /* | |
4 | * cgroup interface | |
5 | * | |
6 | * Copyright (C) 2003 BULL SA | |
7 | * Copyright (C) 2004-2006 Silicon Graphics, Inc. | |
8 | * | |
9 | */ | |
10 | ||
11 | #include <linux/sched.h> | |
ddbcc7e8 PM |
12 | #include <linux/cpumask.h> |
13 | #include <linux/nodemask.h> | |
eb6fd504 | 14 | #include <linux/rculist.h> |
846c7bb0 | 15 | #include <linux/cgroupstats.h> |
cc31edce | 16 | #include <linux/rwsem.h> |
25a7e684 | 17 | #include <linux/fs.h> |
7da11279 | 18 | #include <linux/seq_file.h> |
2bd59d48 | 19 | #include <linux/kernfs.h> |
49d1dc4b | 20 | #include <linux/jump_label.h> |
ddbcc7e8 | 21 | |
b4a04ab7 | 22 | #include <linux/cgroup-defs.h> |
ddbcc7e8 PM |
23 | |
24 | #ifdef CONFIG_CGROUPS | |
25 | ||
6abc8ca1 TH |
26 | /* |
27 | * All weight knobs on the default hierarhcy should use the following min, | |
28 | * default and max values. The default value is the logarithmic center of | |
29 | * MIN and MAX and allows 100x to be expressed in both directions. | |
30 | */ | |
31 | #define CGROUP_WEIGHT_MIN 1 | |
32 | #define CGROUP_WEIGHT_DFL 100 | |
33 | #define CGROUP_WEIGHT_MAX 10000 | |
34 | ||
c326aa2b TH |
35 | /* a css_task_iter should be treated as an opaque object */ |
36 | struct css_task_iter { | |
37 | struct cgroup_subsys *ss; | |
38 | ||
39 | struct list_head *cset_pos; | |
40 | struct list_head *cset_head; | |
ddbcc7e8 | 41 | |
c326aa2b TH |
42 | struct list_head *task_pos; |
43 | struct list_head *tasks_head; | |
44 | struct list_head *mg_tasks_head; | |
45 | }; | |
ddbcc7e8 | 46 | |
c326aa2b TH |
47 | extern struct cgroup_root cgrp_dfl_root; |
48 | extern struct css_set init_css_set; | |
a424316c | 49 | |
c326aa2b | 50 | #define SUBSYS(_x) extern struct cgroup_subsys _x ## _cgrp_subsys; |
817929ec | 51 | #include <linux/cgroup_subsys.h> |
817929ec PM |
52 | #undef SUBSYS |
53 | ||
49d1dc4b TH |
54 | #define SUBSYS(_x) \ |
55 | extern struct static_key_true _x ## _cgrp_subsys_enabled_key; \ | |
56 | extern struct static_key_true _x ## _cgrp_subsys_on_dfl_key; | |
57 | #include <linux/cgroup_subsys.h> | |
58 | #undef SUBSYS | |
59 | ||
60 | /** | |
61 | * cgroup_subsys_enabled - fast test on whether a subsys is enabled | |
62 | * @ss: subsystem in question | |
63 | */ | |
64 | #define cgroup_subsys_enabled(ss) \ | |
65 | static_branch_likely(&ss ## _enabled_key) | |
66 | ||
67 | /** | |
68 | * cgroup_subsys_on_dfl - fast test on whether a subsys is on default hierarchy | |
69 | * @ss: subsystem in question | |
70 | */ | |
71 | #define cgroup_subsys_on_dfl(ss) \ | |
72 | static_branch_likely(&ss ## _on_dfl_key) | |
73 | ||
c326aa2b TH |
74 | bool css_has_online_children(struct cgroup_subsys_state *css); |
75 | struct cgroup_subsys_state *css_from_id(int id, struct cgroup_subsys *ss); | |
76 | struct cgroup_subsys_state *cgroup_get_e_css(struct cgroup *cgroup, | |
77 | struct cgroup_subsys *ss); | |
78 | struct cgroup_subsys_state *css_tryget_online_from_dir(struct dentry *dentry, | |
79 | struct cgroup_subsys *ss); | |
80 | ||
81 | bool cgroup_is_descendant(struct cgroup *cgrp, struct cgroup *ancestor); | |
82 | int cgroup_attach_task_all(struct task_struct *from, struct task_struct *); | |
83 | int cgroup_transfer_tasks(struct cgroup *to, struct cgroup *from); | |
84 | ||
85 | int cgroup_add_dfl_cftypes(struct cgroup_subsys *ss, struct cftype *cfts); | |
86 | int cgroup_add_legacy_cftypes(struct cgroup_subsys *ss, struct cftype *cfts); | |
87 | int cgroup_rm_cftypes(struct cftype *cfts); | |
88 | ||
89 | char *task_cgroup_path(struct task_struct *task, char *buf, size_t buflen); | |
90 | int cgroupstats_build(struct cgroupstats *stats, struct dentry *dentry); | |
91 | int proc_cgroup_show(struct seq_file *m, struct pid_namespace *ns, | |
92 | struct pid *pid, struct task_struct *tsk); | |
93 | ||
94 | void cgroup_fork(struct task_struct *p); | |
7e47682e AS |
95 | extern int cgroup_can_fork(struct task_struct *p, |
96 | void *ss_priv[CGROUP_CANFORK_COUNT]); | |
97 | extern void cgroup_cancel_fork(struct task_struct *p, | |
98 | void *ss_priv[CGROUP_CANFORK_COUNT]); | |
99 | extern void cgroup_post_fork(struct task_struct *p, | |
100 | void *old_ss_priv[CGROUP_CANFORK_COUNT]); | |
c326aa2b TH |
101 | void cgroup_exit(struct task_struct *p); |
102 | ||
103 | int cgroup_init_early(void); | |
104 | int cgroup_init(void); | |
105 | ||
5c9d535b | 106 | /* |
c326aa2b TH |
107 | * Iteration helpers and macros. |
108 | */ | |
109 | ||
110 | struct cgroup_subsys_state *css_next_child(struct cgroup_subsys_state *pos, | |
111 | struct cgroup_subsys_state *parent); | |
112 | struct cgroup_subsys_state *css_next_descendant_pre(struct cgroup_subsys_state *pos, | |
113 | struct cgroup_subsys_state *css); | |
114 | struct cgroup_subsys_state *css_rightmost_descendant(struct cgroup_subsys_state *pos); | |
115 | struct cgroup_subsys_state *css_next_descendant_post(struct cgroup_subsys_state *pos, | |
116 | struct cgroup_subsys_state *css); | |
117 | ||
118 | struct task_struct *cgroup_taskset_first(struct cgroup_taskset *tset); | |
119 | struct task_struct *cgroup_taskset_next(struct cgroup_taskset *tset); | |
120 | ||
121 | void css_task_iter_start(struct cgroup_subsys_state *css, | |
122 | struct css_task_iter *it); | |
123 | struct task_struct *css_task_iter_next(struct css_task_iter *it); | |
124 | void css_task_iter_end(struct css_task_iter *it); | |
125 | ||
126 | /** | |
127 | * css_for_each_child - iterate through children of a css | |
128 | * @pos: the css * to use as the loop cursor | |
129 | * @parent: css whose children to walk | |
130 | * | |
131 | * Walk @parent's children. Must be called under rcu_read_lock(). | |
132 | * | |
133 | * If a subsystem synchronizes ->css_online() and the start of iteration, a | |
134 | * css which finished ->css_online() is guaranteed to be visible in the | |
135 | * future iterations and will stay visible until the last reference is put. | |
136 | * A css which hasn't finished ->css_online() or already finished | |
137 | * ->css_offline() may show up during traversal. It's each subsystem's | |
138 | * responsibility to synchronize against on/offlining. | |
5c9d535b | 139 | * |
c326aa2b TH |
140 | * It is allowed to temporarily drop RCU read lock during iteration. The |
141 | * caller is responsible for ensuring that @pos remains accessible until | |
142 | * the start of the next iteration by, for example, bumping the css refcnt. | |
5c9d535b | 143 | */ |
c326aa2b TH |
144 | #define css_for_each_child(pos, parent) \ |
145 | for ((pos) = css_next_child(NULL, (parent)); (pos); \ | |
146 | (pos) = css_next_child((pos), (parent))) | |
ddbcc7e8 | 147 | |
c326aa2b TH |
148 | /** |
149 | * css_for_each_descendant_pre - pre-order walk of a css's descendants | |
150 | * @pos: the css * to use as the loop cursor | |
151 | * @root: css whose descendants to walk | |
152 | * | |
153 | * Walk @root's descendants. @root is included in the iteration and the | |
154 | * first node to be visited. Must be called under rcu_read_lock(). | |
155 | * | |
156 | * If a subsystem synchronizes ->css_online() and the start of iteration, a | |
157 | * css which finished ->css_online() is guaranteed to be visible in the | |
158 | * future iterations and will stay visible until the last reference is put. | |
159 | * A css which hasn't finished ->css_online() or already finished | |
160 | * ->css_offline() may show up during traversal. It's each subsystem's | |
161 | * responsibility to synchronize against on/offlining. | |
162 | * | |
163 | * For example, the following guarantees that a descendant can't escape | |
164 | * state updates of its ancestors. | |
165 | * | |
166 | * my_online(@css) | |
167 | * { | |
168 | * Lock @css's parent and @css; | |
169 | * Inherit state from the parent; | |
170 | * Unlock both. | |
171 | * } | |
172 | * | |
173 | * my_update_state(@css) | |
174 | * { | |
175 | * css_for_each_descendant_pre(@pos, @css) { | |
176 | * Lock @pos; | |
177 | * if (@pos == @css) | |
178 | * Update @css's state; | |
179 | * else | |
180 | * Verify @pos is alive and inherit state from its parent; | |
181 | * Unlock @pos; | |
182 | * } | |
183 | * } | |
184 | * | |
185 | * As long as the inheriting step, including checking the parent state, is | |
186 | * enclosed inside @pos locking, double-locking the parent isn't necessary | |
187 | * while inheriting. The state update to the parent is guaranteed to be | |
188 | * visible by walking order and, as long as inheriting operations to the | |
189 | * same @pos are atomic to each other, multiple updates racing each other | |
190 | * still result in the correct state. It's guaranateed that at least one | |
191 | * inheritance happens for any css after the latest update to its parent. | |
192 | * | |
193 | * If checking parent's state requires locking the parent, each inheriting | |
194 | * iteration should lock and unlock both @pos->parent and @pos. | |
195 | * | |
196 | * Alternatively, a subsystem may choose to use a single global lock to | |
197 | * synchronize ->css_online() and ->css_offline() against tree-walking | |
198 | * operations. | |
199 | * | |
200 | * It is allowed to temporarily drop RCU read lock during iteration. The | |
201 | * caller is responsible for ensuring that @pos remains accessible until | |
202 | * the start of the next iteration by, for example, bumping the css refcnt. | |
203 | */ | |
204 | #define css_for_each_descendant_pre(pos, css) \ | |
205 | for ((pos) = css_next_descendant_pre(NULL, (css)); (pos); \ | |
206 | (pos) = css_next_descendant_pre((pos), (css))) | |
207 | ||
208 | /** | |
209 | * css_for_each_descendant_post - post-order walk of a css's descendants | |
210 | * @pos: the css * to use as the loop cursor | |
211 | * @css: css whose descendants to walk | |
212 | * | |
213 | * Similar to css_for_each_descendant_pre() but performs post-order | |
214 | * traversal instead. @root is included in the iteration and the last | |
215 | * node to be visited. | |
216 | * | |
217 | * If a subsystem synchronizes ->css_online() and the start of iteration, a | |
218 | * css which finished ->css_online() is guaranteed to be visible in the | |
219 | * future iterations and will stay visible until the last reference is put. | |
220 | * A css which hasn't finished ->css_online() or already finished | |
221 | * ->css_offline() may show up during traversal. It's each subsystem's | |
222 | * responsibility to synchronize against on/offlining. | |
223 | * | |
224 | * Note that the walk visibility guarantee example described in pre-order | |
225 | * walk doesn't apply the same to post-order walks. | |
226 | */ | |
227 | #define css_for_each_descendant_post(pos, css) \ | |
228 | for ((pos) = css_next_descendant_post(NULL, (css)); (pos); \ | |
229 | (pos) = css_next_descendant_post((pos), (css))) | |
230 | ||
231 | /** | |
232 | * cgroup_taskset_for_each - iterate cgroup_taskset | |
233 | * @task: the loop cursor | |
234 | * @tset: taskset to iterate | |
4530eddb TH |
235 | * |
236 | * @tset may contain multiple tasks and they may belong to multiple | |
237 | * processes. When there are multiple tasks in @tset, if a task of a | |
238 | * process is in @tset, all tasks of the process are in @tset. Also, all | |
239 | * are guaranteed to share the same source and destination csses. | |
240 | * | |
241 | * Iteration is not in any specific order. | |
c326aa2b TH |
242 | */ |
243 | #define cgroup_taskset_for_each(task, tset) \ | |
244 | for ((task) = cgroup_taskset_first((tset)); (task); \ | |
245 | (task) = cgroup_taskset_next((tset))) | |
ddbcc7e8 | 246 | |
4530eddb TH |
247 | /** |
248 | * cgroup_taskset_for_each_leader - iterate group leaders in a cgroup_taskset | |
249 | * @leader: the loop cursor | |
250 | * @tset: takset to iterate | |
251 | * | |
252 | * Iterate threadgroup leaders of @tset. For single-task migrations, @tset | |
253 | * may not contain any. | |
254 | */ | |
255 | #define cgroup_taskset_for_each_leader(leader, tset) \ | |
256 | for ((leader) = cgroup_taskset_first((tset)); (leader); \ | |
257 | (leader) = cgroup_taskset_next((tset))) \ | |
258 | if ((leader) != (leader)->group_leader) \ | |
259 | ; \ | |
260 | else | |
261 | ||
c326aa2b TH |
262 | /* |
263 | * Inline functions. | |
264 | */ | |
ddbcc7e8 | 265 | |
5de0107e TH |
266 | /** |
267 | * css_get - obtain a reference on the specified css | |
268 | * @css: target css | |
269 | * | |
270 | * The caller must already have a reference. | |
ddbcc7e8 | 271 | */ |
ddbcc7e8 PM |
272 | static inline void css_get(struct cgroup_subsys_state *css) |
273 | { | |
3b514d24 TH |
274 | if (!(css->flags & CSS_NO_REF)) |
275 | percpu_ref_get(&css->refcnt); | |
ddbcc7e8 | 276 | } |
e7c5ec91 | 277 | |
e8ea14cc JW |
278 | /** |
279 | * css_get_many - obtain references on the specified css | |
280 | * @css: target css | |
281 | * @n: number of references to get | |
282 | * | |
283 | * The caller must already have a reference. | |
284 | */ | |
285 | static inline void css_get_many(struct cgroup_subsys_state *css, unsigned int n) | |
286 | { | |
287 | if (!(css->flags & CSS_NO_REF)) | |
288 | percpu_ref_get_many(&css->refcnt, n); | |
289 | } | |
290 | ||
6f4524d3 TH |
291 | /** |
292 | * css_tryget - try to obtain a reference on the specified css | |
293 | * @css: target css | |
294 | * | |
295 | * Obtain a reference on @css unless it already has reached zero and is | |
296 | * being released. This function doesn't care whether @css is on or | |
297 | * offline. The caller naturally needs to ensure that @css is accessible | |
298 | * but doesn't have to be holding a reference on it - IOW, RCU protected | |
299 | * access is good enough for this function. Returns %true if a reference | |
300 | * count was successfully obtained; %false otherwise. | |
301 | */ | |
302 | static inline bool css_tryget(struct cgroup_subsys_state *css) | |
303 | { | |
304 | if (!(css->flags & CSS_NO_REF)) | |
305 | return percpu_ref_tryget(&css->refcnt); | |
306 | return true; | |
307 | } | |
308 | ||
5de0107e | 309 | /** |
ec903c0c | 310 | * css_tryget_online - try to obtain a reference on the specified css if online |
5de0107e TH |
311 | * @css: target css |
312 | * | |
ec903c0c TH |
313 | * Obtain a reference on @css if it's online. The caller naturally needs |
314 | * to ensure that @css is accessible but doesn't have to be holding a | |
5de0107e TH |
315 | * reference on it - IOW, RCU protected access is good enough for this |
316 | * function. Returns %true if a reference count was successfully obtained; | |
317 | * %false otherwise. | |
318 | */ | |
ec903c0c | 319 | static inline bool css_tryget_online(struct cgroup_subsys_state *css) |
e7c5ec91 | 320 | { |
3b514d24 TH |
321 | if (!(css->flags & CSS_NO_REF)) |
322 | return percpu_ref_tryget_live(&css->refcnt); | |
323 | return true; | |
e7c5ec91 | 324 | } |
2f7ee569 TH |
325 | |
326 | /** | |
5de0107e TH |
327 | * css_put - put a css reference |
328 | * @css: target css | |
329 | * | |
ec903c0c | 330 | * Put a reference obtained via css_get() and css_tryget_online(). |
2f7ee569 | 331 | */ |
ddbcc7e8 PM |
332 | static inline void css_put(struct cgroup_subsys_state *css) |
333 | { | |
3b514d24 TH |
334 | if (!(css->flags & CSS_NO_REF)) |
335 | percpu_ref_put(&css->refcnt); | |
ddbcc7e8 | 336 | } |
2f7ee569 | 337 | |
e8ea14cc JW |
338 | /** |
339 | * css_put_many - put css references | |
340 | * @css: target css | |
341 | * @n: number of references to put | |
342 | * | |
343 | * Put references obtained via css_get() and css_tryget_online(). | |
21acb9ca | 344 | */ |
e8ea14cc JW |
345 | static inline void css_put_many(struct cgroup_subsys_state *css, unsigned int n) |
346 | { | |
347 | if (!(css->flags & CSS_NO_REF)) | |
348 | percpu_ref_put_many(&css->refcnt, n); | |
349 | } | |
ddbcc7e8 | 350 | |
14611e51 TH |
351 | /** |
352 | * task_css_set_check - obtain a task's css_set with extra access conditions | |
353 | * @task: the task to obtain css_set for | |
354 | * @__c: extra condition expression to be passed to rcu_dereference_check() | |
355 | * | |
356 | * A task's css_set is RCU protected, initialized and exited while holding | |
357 | * task_lock(), and can only be modified while holding both cgroup_mutex | |
358 | * and task_lock() while the task is alive. This macro verifies that the | |
359 | * caller is inside proper critical section and returns @task's css_set. | |
360 | * | |
361 | * The caller can also specify additional allowed conditions via @__c, such | |
362 | * as locks used during the cgroup_subsys::attach() methods. | |
dc61b1d6 | 363 | */ |
2219449a TH |
364 | #ifdef CONFIG_PROVE_RCU |
365 | extern struct mutex cgroup_mutex; | |
0e1d768f | 366 | extern struct rw_semaphore css_set_rwsem; |
14611e51 TH |
367 | #define task_css_set_check(task, __c) \ |
368 | rcu_dereference_check((task)->cgroups, \ | |
0e1d768f TH |
369 | lockdep_is_held(&cgroup_mutex) || \ |
370 | lockdep_is_held(&css_set_rwsem) || \ | |
371 | ((task)->flags & PF_EXITING) || (__c)) | |
2219449a | 372 | #else |
14611e51 TH |
373 | #define task_css_set_check(task, __c) \ |
374 | rcu_dereference((task)->cgroups) | |
2219449a | 375 | #endif |
dc61b1d6 | 376 | |
14611e51 | 377 | /** |
8af01f56 | 378 | * task_css_check - obtain css for (task, subsys) w/ extra access conds |
14611e51 TH |
379 | * @task: the target task |
380 | * @subsys_id: the target subsystem ID | |
381 | * @__c: extra condition expression to be passed to rcu_dereference_check() | |
382 | * | |
383 | * Return the cgroup_subsys_state for the (@task, @subsys_id) pair. The | |
384 | * synchronization rules are the same as task_css_set_check(). | |
385 | */ | |
8af01f56 | 386 | #define task_css_check(task, subsys_id, __c) \ |
14611e51 TH |
387 | task_css_set_check((task), (__c))->subsys[(subsys_id)] |
388 | ||
389 | /** | |
390 | * task_css_set - obtain a task's css_set | |
391 | * @task: the task to obtain css_set for | |
392 | * | |
393 | * See task_css_set_check(). | |
394 | */ | |
395 | static inline struct css_set *task_css_set(struct task_struct *task) | |
396 | { | |
397 | return task_css_set_check(task, false); | |
398 | } | |
399 | ||
400 | /** | |
8af01f56 | 401 | * task_css - obtain css for (task, subsys) |
14611e51 TH |
402 | * @task: the target task |
403 | * @subsys_id: the target subsystem ID | |
404 | * | |
8af01f56 | 405 | * See task_css_check(). |
14611e51 | 406 | */ |
8af01f56 TH |
407 | static inline struct cgroup_subsys_state *task_css(struct task_struct *task, |
408 | int subsys_id) | |
ddbcc7e8 | 409 | { |
8af01f56 | 410 | return task_css_check(task, subsys_id, false); |
ddbcc7e8 PM |
411 | } |
412 | ||
ec438699 TH |
413 | /** |
414 | * task_get_css - find and get the css for (task, subsys) | |
415 | * @task: the target task | |
416 | * @subsys_id: the target subsystem ID | |
417 | * | |
418 | * Find the css for the (@task, @subsys_id) combination, increment a | |
419 | * reference on and return it. This function is guaranteed to return a | |
420 | * valid css. | |
421 | */ | |
422 | static inline struct cgroup_subsys_state * | |
423 | task_get_css(struct task_struct *task, int subsys_id) | |
424 | { | |
425 | struct cgroup_subsys_state *css; | |
426 | ||
427 | rcu_read_lock(); | |
428 | while (true) { | |
429 | css = task_css(task, subsys_id); | |
430 | if (likely(css_tryget_online(css))) | |
431 | break; | |
432 | cpu_relax(); | |
433 | } | |
434 | rcu_read_unlock(); | |
435 | return css; | |
436 | } | |
437 | ||
5024ae29 TH |
438 | /** |
439 | * task_css_is_root - test whether a task belongs to the root css | |
440 | * @task: the target task | |
441 | * @subsys_id: the target subsystem ID | |
442 | * | |
443 | * Test whether @task belongs to the root css on the specified subsystem. | |
444 | * May be invoked in any context. | |
445 | */ | |
446 | static inline bool task_css_is_root(struct task_struct *task, int subsys_id) | |
447 | { | |
448 | return task_css_check(task, subsys_id, true) == | |
449 | init_css_set.subsys[subsys_id]; | |
450 | } | |
451 | ||
8af01f56 TH |
452 | static inline struct cgroup *task_cgroup(struct task_struct *task, |
453 | int subsys_id) | |
ddbcc7e8 | 454 | { |
8af01f56 | 455 | return task_css(task, subsys_id)->cgroup; |
ddbcc7e8 PM |
456 | } |
457 | ||
07bc356e TH |
458 | /* no synchronization, the result can only be used as a hint */ |
459 | static inline bool cgroup_has_tasks(struct cgroup *cgrp) | |
460 | { | |
461 | return !list_empty(&cgrp->cset_links); | |
462 | } | |
f3d46500 | 463 | |
f29374b1 | 464 | /* returns ino associated with a cgroup */ |
b1664924 TH |
465 | static inline ino_t cgroup_ino(struct cgroup *cgrp) |
466 | { | |
f29374b1 | 467 | return cgrp->kn->ino; |
b1664924 | 468 | } |
3ebb2b6e | 469 | |
b4168640 TH |
470 | /* cft/css accessors for cftype->write() operation */ |
471 | static inline struct cftype *of_cft(struct kernfs_open_file *of) | |
7da11279 | 472 | { |
2bd59d48 | 473 | return of->kn->priv; |
7da11279 | 474 | } |
0f0a2b4f | 475 | |
b4168640 | 476 | struct cgroup_subsys_state *of_css(struct kernfs_open_file *of); |
817929ec | 477 | |
b4168640 TH |
478 | /* cft/css accessors for cftype->seq_*() operations */ |
479 | static inline struct cftype *seq_cft(struct seq_file *seq) | |
480 | { | |
481 | return of_cft(seq->private); | |
482 | } | |
e535837b | 483 | |
b4168640 TH |
484 | static inline struct cgroup_subsys_state *seq_css(struct seq_file *seq) |
485 | { | |
486 | return of_css(seq->private); | |
487 | } | |
31583bb0 | 488 | |
e61734c5 TH |
489 | /* |
490 | * Name / path handling functions. All are thin wrappers around the kernfs | |
491 | * counterparts and can be called under any context. | |
492 | */ | |
38460b48 | 493 | |
e61734c5 TH |
494 | static inline int cgroup_name(struct cgroup *cgrp, char *buf, size_t buflen) |
495 | { | |
fdce6bf8 | 496 | return kernfs_name(cgrp->kn, buf, buflen); |
e61734c5 | 497 | } |
ddbcc7e8 | 498 | |
e61734c5 TH |
499 | static inline char * __must_check cgroup_path(struct cgroup *cgrp, char *buf, |
500 | size_t buflen) | |
501 | { | |
fdce6bf8 | 502 | return kernfs_path(cgrp->kn, buf, buflen); |
e61734c5 | 503 | } |
f3ba5380 | 504 | |
e61734c5 TH |
505 | static inline void pr_cont_cgroup_name(struct cgroup *cgrp) |
506 | { | |
fdce6bf8 | 507 | pr_cont_kernfs_name(cgrp->kn); |
e61734c5 | 508 | } |
ddbcc7e8 | 509 | |
e61734c5 | 510 | static inline void pr_cont_cgroup_path(struct cgroup *cgrp) |
846c7bb0 | 511 | { |
fdce6bf8 | 512 | pr_cont_kernfs_path(cgrp->kn); |
846c7bb0 | 513 | } |
ddbcc7e8 | 514 | |
6f60eade TH |
515 | /** |
516 | * cgroup_file_notify - generate a file modified event for a cgroup_file | |
517 | * @cfile: target cgroup_file | |
518 | * | |
519 | * @cfile must have been obtained by setting cftype->file_offset. | |
520 | */ | |
521 | static inline void cgroup_file_notify(struct cgroup_file *cfile) | |
522 | { | |
523 | /* might not have been created due to one of the CFTYPE selector flags */ | |
524 | if (cfile->kn) | |
525 | kernfs_notify(cfile->kn); | |
526 | } | |
527 | ||
ddbcc7e8 PM |
528 | #else /* !CONFIG_CGROUPS */ |
529 | ||
f3ba5380 | 530 | struct cgroup_subsys_state; |
f3ba5380 | 531 | |
c326aa2b | 532 | static inline void css_put(struct cgroup_subsys_state *css) {} |
31583bb0 | 533 | static inline int cgroup_attach_task_all(struct task_struct *from, |
c326aa2b TH |
534 | struct task_struct *t) { return 0; } |
535 | static inline int cgroupstats_build(struct cgroupstats *stats, | |
536 | struct dentry *dentry) { return -EINVAL; } | |
537 | ||
b4f48b63 | 538 | static inline void cgroup_fork(struct task_struct *p) {} |
7e47682e AS |
539 | static inline int cgroup_can_fork(struct task_struct *p, |
540 | void *ss_priv[CGROUP_CANFORK_COUNT]) | |
541 | { return 0; } | |
542 | static inline void cgroup_cancel_fork(struct task_struct *p, | |
543 | void *ss_priv[CGROUP_CANFORK_COUNT]) {} | |
544 | static inline void cgroup_post_fork(struct task_struct *p, | |
545 | void *ss_priv[CGROUP_CANFORK_COUNT]) {} | |
1ec41830 | 546 | static inline void cgroup_exit(struct task_struct *p) {} |
ddbcc7e8 | 547 | |
c326aa2b TH |
548 | static inline int cgroup_init_early(void) { return 0; } |
549 | static inline int cgroup_init(void) { return 0; } | |
d7926ee3 | 550 | |
ddbcc7e8 PM |
551 | #endif /* !CONFIG_CGROUPS */ |
552 | ||
553 | #endif /* _LINUX_CGROUP_H */ |