Commit | Line | Data |
---|---|---|
dc52ddc0 MH |
1 | /* |
2 | * cgroup_freezer.c - control group freezer subsystem | |
3 | * | |
4 | * Copyright IBM Corporation, 2007 | |
5 | * | |
6 | * Author : Cedric Le Goater <clg@fr.ibm.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of version 2.1 of the GNU Lesser General Public License | |
10 | * as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it would be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
15 | */ | |
16 | ||
9984de1a | 17 | #include <linux/export.h> |
5a0e3ad6 | 18 | #include <linux/slab.h> |
dc52ddc0 MH |
19 | #include <linux/cgroup.h> |
20 | #include <linux/fs.h> | |
21 | #include <linux/uaccess.h> | |
22 | #include <linux/freezer.h> | |
23 | #include <linux/seq_file.h> | |
e5ced8eb | 24 | #include <linux/mutex.h> |
dc52ddc0 | 25 | |
ef9fe980 TH |
26 | /* |
27 | * A cgroup is freezing if any FREEZING flags are set. FREEZING_SELF is | |
28 | * set if "FROZEN" is written to freezer.state cgroupfs file, and cleared | |
29 | * for "THAWED". FREEZING_PARENT is set if the parent freezer is FREEZING | |
30 | * for whatever reason. IOW, a cgroup has FREEZING_PARENT set if one of | |
31 | * its ancestors has FREEZING_SELF set. | |
32 | */ | |
d6a2fe13 | 33 | enum freezer_state_flags { |
5300a9b3 | 34 | CGROUP_FREEZER_ONLINE = (1 << 0), /* freezer is fully online */ |
a2252180 TH |
35 | CGROUP_FREEZING_SELF = (1 << 1), /* this freezer is freezing */ |
36 | CGROUP_FREEZING_PARENT = (1 << 2), /* the parent freezer is freezing */ | |
d6a2fe13 | 37 | CGROUP_FROZEN = (1 << 3), /* this and its descendants frozen */ |
a2252180 TH |
38 | |
39 | /* mask for all FREEZING flags */ | |
40 | CGROUP_FREEZING = CGROUP_FREEZING_SELF | CGROUP_FREEZING_PARENT, | |
dc52ddc0 MH |
41 | }; |
42 | ||
43 | struct freezer { | |
bcd66c89 | 44 | struct cgroup_subsys_state css; |
d6a2fe13 | 45 | unsigned int state; |
dc52ddc0 MH |
46 | }; |
47 | ||
e5ced8eb TH |
48 | static DEFINE_MUTEX(freezer_mutex); |
49 | ||
a7c6d554 TH |
50 | static inline struct freezer *css_freezer(struct cgroup_subsys_state *css) |
51 | { | |
52 | return css ? container_of(css, struct freezer, css) : NULL; | |
53 | } | |
54 | ||
dc52ddc0 MH |
55 | static inline struct freezer *task_freezer(struct task_struct *task) |
56 | { | |
073219e9 | 57 | return css_freezer(task_css(task, freezer_cgrp_id)); |
dc52ddc0 MH |
58 | } |
59 | ||
ef9fe980 TH |
60 | static struct freezer *parent_freezer(struct freezer *freezer) |
61 | { | |
63876986 | 62 | return css_freezer(css_parent(&freezer->css)); |
ef9fe980 TH |
63 | } |
64 | ||
22b4e111 | 65 | bool cgroup_freezing(struct task_struct *task) |
dc52ddc0 | 66 | { |
22b4e111 | 67 | bool ret; |
dc52ddc0 | 68 | |
22b4e111 | 69 | rcu_read_lock(); |
d6a2fe13 | 70 | ret = task_freezer(task)->state & CGROUP_FREEZING; |
22b4e111 TH |
71 | rcu_read_unlock(); |
72 | ||
73 | return ret; | |
dc52ddc0 MH |
74 | } |
75 | ||
76 | /* | |
77 | * cgroups_write_string() limits the size of freezer state strings to | |
78 | * CGROUP_LOCAL_BUFFER_SIZE | |
79 | */ | |
d6a2fe13 TH |
80 | static const char *freezer_state_strs(unsigned int state) |
81 | { | |
82 | if (state & CGROUP_FROZEN) | |
83 | return "FROZEN"; | |
84 | if (state & CGROUP_FREEZING) | |
85 | return "FREEZING"; | |
86 | return "THAWED"; | |
dc52ddc0 MH |
87 | }; |
88 | ||
eb95419b TH |
89 | static struct cgroup_subsys_state * |
90 | freezer_css_alloc(struct cgroup_subsys_state *parent_css) | |
dc52ddc0 MH |
91 | { |
92 | struct freezer *freezer; | |
93 | ||
94 | freezer = kzalloc(sizeof(struct freezer), GFP_KERNEL); | |
95 | if (!freezer) | |
96 | return ERR_PTR(-ENOMEM); | |
97 | ||
dc52ddc0 MH |
98 | return &freezer->css; |
99 | } | |
100 | ||
5300a9b3 | 101 | /** |
eb95419b TH |
102 | * freezer_css_online - commit creation of a freezer css |
103 | * @css: css being created | |
5300a9b3 | 104 | * |
eb95419b | 105 | * We're committing to creation of @css. Mark it online and inherit |
ef9fe980 TH |
106 | * parent's freezing state while holding both parent's and our |
107 | * freezer->lock. | |
5300a9b3 | 108 | */ |
eb95419b | 109 | static int freezer_css_online(struct cgroup_subsys_state *css) |
dc52ddc0 | 110 | { |
eb95419b | 111 | struct freezer *freezer = css_freezer(css); |
ef9fe980 TH |
112 | struct freezer *parent = parent_freezer(freezer); |
113 | ||
e5ced8eb | 114 | mutex_lock(&freezer_mutex); |
a3201227 | 115 | |
5300a9b3 | 116 | freezer->state |= CGROUP_FREEZER_ONLINE; |
ef9fe980 TH |
117 | |
118 | if (parent && (parent->state & CGROUP_FREEZING)) { | |
119 | freezer->state |= CGROUP_FREEZING_PARENT | CGROUP_FROZEN; | |
120 | atomic_inc(&system_freezing_cnt); | |
121 | } | |
122 | ||
e5ced8eb | 123 | mutex_unlock(&freezer_mutex); |
b1929db4 | 124 | return 0; |
5300a9b3 TH |
125 | } |
126 | ||
127 | /** | |
eb95419b TH |
128 | * freezer_css_offline - initiate destruction of a freezer css |
129 | * @css: css being destroyed | |
5300a9b3 | 130 | * |
eb95419b TH |
131 | * @css is going away. Mark it dead and decrement system_freezing_count if |
132 | * it was holding one. | |
5300a9b3 | 133 | */ |
eb95419b | 134 | static void freezer_css_offline(struct cgroup_subsys_state *css) |
5300a9b3 | 135 | { |
eb95419b | 136 | struct freezer *freezer = css_freezer(css); |
5300a9b3 | 137 | |
e5ced8eb | 138 | mutex_lock(&freezer_mutex); |
5300a9b3 | 139 | |
d6a2fe13 | 140 | if (freezer->state & CGROUP_FREEZING) |
a3201227 | 141 | atomic_dec(&system_freezing_cnt); |
5300a9b3 TH |
142 | |
143 | freezer->state = 0; | |
144 | ||
e5ced8eb | 145 | mutex_unlock(&freezer_mutex); |
5300a9b3 TH |
146 | } |
147 | ||
eb95419b | 148 | static void freezer_css_free(struct cgroup_subsys_state *css) |
5300a9b3 | 149 | { |
eb95419b | 150 | kfree(css_freezer(css)); |
dc52ddc0 MH |
151 | } |
152 | ||
957a4eea | 153 | /* |
ead5c473 TH |
154 | * Tasks can be migrated into a different freezer anytime regardless of its |
155 | * current state. freezer_attach() is responsible for making new tasks | |
156 | * conform to the current state. | |
157 | * | |
158 | * Freezer state changes and task migration are synchronized via | |
159 | * @freezer->lock. freezer_attach() makes the new tasks conform to the | |
160 | * current state and all following state changes can see the new tasks. | |
957a4eea | 161 | */ |
eb95419b TH |
162 | static void freezer_attach(struct cgroup_subsys_state *new_css, |
163 | struct cgroup_taskset *tset) | |
dc52ddc0 | 164 | { |
eb95419b | 165 | struct freezer *freezer = css_freezer(new_css); |
bb9d97b6 | 166 | struct task_struct *task; |
ef9fe980 | 167 | bool clear_frozen = false; |
957a4eea | 168 | |
e5ced8eb | 169 | mutex_lock(&freezer_mutex); |
8755ade6 | 170 | |
80a6a2cf | 171 | /* |
eb95419b | 172 | * Make the new tasks conform to the current state of @new_css. |
8755ade6 TH |
173 | * For simplicity, when migrating any task to a FROZEN cgroup, we |
174 | * revert it to FREEZING and let update_if_frozen() determine the | |
175 | * correct state later. | |
176 | * | |
eb95419b | 177 | * Tasks in @tset are on @new_css but may not conform to its |
8755ade6 TH |
178 | * current state before executing the following - !frozen tasks may |
179 | * be visible in a FROZEN cgroup and frozen tasks in a THAWED one. | |
80a6a2cf | 180 | */ |
924f0d9a | 181 | cgroup_taskset_for_each(task, tset) { |
d6a2fe13 | 182 | if (!(freezer->state & CGROUP_FREEZING)) { |
8755ade6 TH |
183 | __thaw_task(task); |
184 | } else { | |
185 | freeze_task(task); | |
d6a2fe13 | 186 | freezer->state &= ~CGROUP_FROZEN; |
ef9fe980 | 187 | clear_frozen = true; |
8755ade6 TH |
188 | } |
189 | } | |
dc52ddc0 | 190 | |
e5ced8eb | 191 | /* propagate FROZEN clearing upwards */ |
ef9fe980 | 192 | while (clear_frozen && (freezer = parent_freezer(freezer))) { |
ef9fe980 TH |
193 | freezer->state &= ~CGROUP_FROZEN; |
194 | clear_frozen = freezer->state & CGROUP_FREEZING; | |
ef9fe980 | 195 | } |
e5ced8eb TH |
196 | |
197 | mutex_unlock(&freezer_mutex); | |
f780bdb7 BB |
198 | } |
199 | ||
a60bed29 TH |
200 | /** |
201 | * freezer_fork - cgroup post fork callback | |
202 | * @task: a task which has just been forked | |
203 | * | |
204 | * @task has just been created and should conform to the current state of | |
205 | * the cgroup_freezer it belongs to. This function may race against | |
206 | * freezer_attach(). Losing to freezer_attach() means that we don't have | |
207 | * to do anything as freezer_attach() will put @task into the appropriate | |
208 | * state. | |
209 | */ | |
761b3ef5 | 210 | static void freezer_fork(struct task_struct *task) |
dc52ddc0 MH |
211 | { |
212 | struct freezer *freezer; | |
213 | ||
3b1b3f6e | 214 | /* |
a60bed29 TH |
215 | * The root cgroup is non-freezable, so we can skip locking the |
216 | * freezer. This is safe regardless of race with task migration. | |
217 | * If we didn't race or won, skipping is obviously the right thing | |
218 | * to do. If we lost and root is the new cgroup, noop is still the | |
219 | * right thing to do. | |
3b1b3f6e | 220 | */ |
e5ced8eb TH |
221 | if (task_css_is_root(task, freezer_cgrp_id)) |
222 | return; | |
3b1b3f6e | 223 | |
e5ced8eb TH |
224 | mutex_lock(&freezer_mutex); |
225 | rcu_read_lock(); | |
226 | ||
227 | freezer = task_freezer(task); | |
228 | if (freezer->state & CGROUP_FREEZING) | |
839e3407 | 229 | freeze_task(task); |
e5ced8eb | 230 | |
5edee61e | 231 | rcu_read_unlock(); |
e5ced8eb | 232 | mutex_unlock(&freezer_mutex); |
dc52ddc0 MH |
233 | } |
234 | ||
ef9fe980 TH |
235 | /** |
236 | * update_if_frozen - update whether a cgroup finished freezing | |
182446d0 | 237 | * @css: css of interest |
ef9fe980 TH |
238 | * |
239 | * Once FREEZING is initiated, transition to FROZEN is lazily updated by | |
240 | * calling this function. If the current state is FREEZING but not FROZEN, | |
241 | * this function checks whether all tasks of this cgroup and the descendant | |
242 | * cgroups finished freezing and, if so, sets FROZEN. | |
243 | * | |
244 | * The caller is responsible for grabbing RCU read lock and calling | |
245 | * update_if_frozen() on all descendants prior to invoking this function. | |
b4d18311 TH |
246 | * |
247 | * Task states and freezer state might disagree while tasks are being | |
182446d0 | 248 | * migrated into or out of @css, so we can't verify task states against |
ead5c473 | 249 | * @freezer state here. See freezer_attach() for details. |
dc52ddc0 | 250 | */ |
182446d0 | 251 | static void update_if_frozen(struct cgroup_subsys_state *css) |
dc52ddc0 | 252 | { |
182446d0 | 253 | struct freezer *freezer = css_freezer(css); |
492eb21b | 254 | struct cgroup_subsys_state *pos; |
72ec7029 | 255 | struct css_task_iter it; |
dc52ddc0 | 256 | struct task_struct *task; |
b4d18311 | 257 | |
e5ced8eb | 258 | lockdep_assert_held(&freezer_mutex); |
ef9fe980 | 259 | |
d6a2fe13 TH |
260 | if (!(freezer->state & CGROUP_FREEZING) || |
261 | (freezer->state & CGROUP_FROZEN)) | |
e5ced8eb | 262 | return; |
ef9fe980 TH |
263 | |
264 | /* are all (live) children frozen? */ | |
e5ced8eb | 265 | rcu_read_lock(); |
492eb21b TH |
266 | css_for_each_child(pos, css) { |
267 | struct freezer *child = css_freezer(pos); | |
dc52ddc0 | 268 | |
ef9fe980 | 269 | if ((child->state & CGROUP_FREEZER_ONLINE) && |
36e9d2eb TH |
270 | !(child->state & CGROUP_FROZEN)) { |
271 | rcu_read_unlock(); | |
e5ced8eb | 272 | return; |
36e9d2eb | 273 | } |
ef9fe980 | 274 | } |
e5ced8eb | 275 | rcu_read_unlock(); |
ef9fe980 TH |
276 | |
277 | /* are all tasks frozen? */ | |
72ec7029 | 278 | css_task_iter_start(css, &it); |
b4d18311 | 279 | |
72ec7029 | 280 | while ((task = css_task_iter_next(&it))) { |
3c426d5e | 281 | if (freezing(task)) { |
3c426d5e TH |
282 | /* |
283 | * freezer_should_skip() indicates that the task | |
284 | * should be skipped when determining freezing | |
285 | * completion. Consider it frozen in addition to | |
286 | * the usual frozen condition. | |
287 | */ | |
5d8f72b5 | 288 | if (!frozen(task) && !freezer_should_skip(task)) |
ef9fe980 | 289 | goto out_iter_end; |
3c426d5e | 290 | } |
dc52ddc0 MH |
291 | } |
292 | ||
d6a2fe13 | 293 | freezer->state |= CGROUP_FROZEN; |
ef9fe980 | 294 | out_iter_end: |
72ec7029 | 295 | css_task_iter_end(&it); |
dc52ddc0 MH |
296 | } |
297 | ||
2da8ca82 | 298 | static int freezer_read(struct seq_file *m, void *v) |
dc52ddc0 | 299 | { |
2da8ca82 | 300 | struct cgroup_subsys_state *css = seq_css(m), *pos; |
dc52ddc0 | 301 | |
e5ced8eb | 302 | mutex_lock(&freezer_mutex); |
ef9fe980 | 303 | rcu_read_lock(); |
dc52ddc0 | 304 | |
ef9fe980 | 305 | /* update states bottom-up */ |
e5ced8eb TH |
306 | css_for_each_descendant_post(pos, css) { |
307 | if (!css_tryget(pos)) | |
308 | continue; | |
309 | rcu_read_unlock(); | |
310 | ||
492eb21b | 311 | update_if_frozen(pos); |
ef9fe980 | 312 | |
e5ced8eb TH |
313 | rcu_read_lock(); |
314 | css_put(pos); | |
315 | } | |
316 | ||
ef9fe980 | 317 | rcu_read_unlock(); |
e5ced8eb | 318 | mutex_unlock(&freezer_mutex); |
ef9fe980 | 319 | |
182446d0 | 320 | seq_puts(m, freezer_state_strs(css_freezer(css)->state)); |
dc52ddc0 MH |
321 | seq_putc(m, '\n'); |
322 | return 0; | |
323 | } | |
324 | ||
bcd66c89 | 325 | static void freeze_cgroup(struct freezer *freezer) |
dc52ddc0 | 326 | { |
72ec7029 | 327 | struct css_task_iter it; |
dc52ddc0 | 328 | struct task_struct *task; |
dc52ddc0 | 329 | |
72ec7029 TH |
330 | css_task_iter_start(&freezer->css, &it); |
331 | while ((task = css_task_iter_next(&it))) | |
51f246ed | 332 | freeze_task(task); |
72ec7029 | 333 | css_task_iter_end(&it); |
dc52ddc0 MH |
334 | } |
335 | ||
bcd66c89 | 336 | static void unfreeze_cgroup(struct freezer *freezer) |
dc52ddc0 | 337 | { |
72ec7029 | 338 | struct css_task_iter it; |
dc52ddc0 MH |
339 | struct task_struct *task; |
340 | ||
72ec7029 TH |
341 | css_task_iter_start(&freezer->css, &it); |
342 | while ((task = css_task_iter_next(&it))) | |
a5be2d0d | 343 | __thaw_task(task); |
72ec7029 | 344 | css_task_iter_end(&it); |
dc52ddc0 MH |
345 | } |
346 | ||
04a4ec32 TH |
347 | /** |
348 | * freezer_apply_state - apply state change to a single cgroup_freezer | |
349 | * @freezer: freezer to apply state change to | |
350 | * @freeze: whether to freeze or unfreeze | |
a2252180 TH |
351 | * @state: CGROUP_FREEZING_* flag to set or clear |
352 | * | |
353 | * Set or clear @state on @cgroup according to @freeze, and perform | |
354 | * freezing or thawing as necessary. | |
04a4ec32 | 355 | */ |
a2252180 TH |
356 | static void freezer_apply_state(struct freezer *freezer, bool freeze, |
357 | unsigned int state) | |
dc52ddc0 | 358 | { |
ead5c473 | 359 | /* also synchronizes against task migration, see freezer_attach() */ |
e5ced8eb | 360 | lockdep_assert_held(&freezer_mutex); |
51308ee5 | 361 | |
5300a9b3 TH |
362 | if (!(freezer->state & CGROUP_FREEZER_ONLINE)) |
363 | return; | |
364 | ||
04a4ec32 | 365 | if (freeze) { |
d6a2fe13 | 366 | if (!(freezer->state & CGROUP_FREEZING)) |
a3201227 | 367 | atomic_inc(&system_freezing_cnt); |
a2252180 | 368 | freezer->state |= state; |
bcd66c89 | 369 | freeze_cgroup(freezer); |
04a4ec32 | 370 | } else { |
a2252180 TH |
371 | bool was_freezing = freezer->state & CGROUP_FREEZING; |
372 | ||
373 | freezer->state &= ~state; | |
374 | ||
375 | if (!(freezer->state & CGROUP_FREEZING)) { | |
376 | if (was_freezing) | |
377 | atomic_dec(&system_freezing_cnt); | |
378 | freezer->state &= ~CGROUP_FROZEN; | |
379 | unfreeze_cgroup(freezer); | |
380 | } | |
dc52ddc0 | 381 | } |
04a4ec32 | 382 | } |
22b4e111 | 383 | |
04a4ec32 TH |
384 | /** |
385 | * freezer_change_state - change the freezing state of a cgroup_freezer | |
386 | * @freezer: freezer of interest | |
387 | * @freeze: whether to freeze or thaw | |
388 | * | |
ef9fe980 TH |
389 | * Freeze or thaw @freezer according to @freeze. The operations are |
390 | * recursive - all descendants of @freezer will be affected. | |
04a4ec32 TH |
391 | */ |
392 | static void freezer_change_state(struct freezer *freezer, bool freeze) | |
393 | { | |
492eb21b | 394 | struct cgroup_subsys_state *pos; |
ef9fe980 | 395 | |
ef9fe980 TH |
396 | /* |
397 | * Update all its descendants in pre-order traversal. Each | |
398 | * descendant will try to inherit its parent's FREEZING state as | |
399 | * CGROUP_FREEZING_PARENT. | |
400 | */ | |
e5ced8eb | 401 | mutex_lock(&freezer_mutex); |
ef9fe980 | 402 | rcu_read_lock(); |
492eb21b TH |
403 | css_for_each_descendant_pre(pos, &freezer->css) { |
404 | struct freezer *pos_f = css_freezer(pos); | |
ef9fe980 TH |
405 | struct freezer *parent = parent_freezer(pos_f); |
406 | ||
e5ced8eb TH |
407 | if (!css_tryget(pos)) |
408 | continue; | |
409 | rcu_read_unlock(); | |
bd8815a6 | 410 | |
e5ced8eb | 411 | if (pos_f == freezer) |
bd8815a6 TH |
412 | freezer_apply_state(pos_f, freeze, |
413 | CGROUP_FREEZING_SELF); | |
e5ced8eb | 414 | else |
bd8815a6 TH |
415 | freezer_apply_state(pos_f, |
416 | parent->state & CGROUP_FREEZING, | |
417 | CGROUP_FREEZING_PARENT); | |
bd8815a6 | 418 | |
e5ced8eb TH |
419 | rcu_read_lock(); |
420 | css_put(pos); | |
ef9fe980 TH |
421 | } |
422 | rcu_read_unlock(); | |
e5ced8eb | 423 | mutex_unlock(&freezer_mutex); |
dc52ddc0 MH |
424 | } |
425 | ||
182446d0 | 426 | static int freezer_write(struct cgroup_subsys_state *css, struct cftype *cft, |
4d3bb511 | 427 | char *buffer) |
dc52ddc0 | 428 | { |
04a4ec32 | 429 | bool freeze; |
dc52ddc0 | 430 | |
d6a2fe13 | 431 | if (strcmp(buffer, freezer_state_strs(0)) == 0) |
04a4ec32 | 432 | freeze = false; |
d6a2fe13 | 433 | else if (strcmp(buffer, freezer_state_strs(CGROUP_FROZEN)) == 0) |
04a4ec32 | 434 | freeze = true; |
dc52ddc0 | 435 | else |
3b1b3f6e | 436 | return -EINVAL; |
dc52ddc0 | 437 | |
182446d0 | 438 | freezer_change_state(css_freezer(css), freeze); |
51f246ed | 439 | return 0; |
dc52ddc0 MH |
440 | } |
441 | ||
182446d0 TH |
442 | static u64 freezer_self_freezing_read(struct cgroup_subsys_state *css, |
443 | struct cftype *cft) | |
a2252180 | 444 | { |
182446d0 | 445 | struct freezer *freezer = css_freezer(css); |
a2252180 TH |
446 | |
447 | return (bool)(freezer->state & CGROUP_FREEZING_SELF); | |
448 | } | |
449 | ||
182446d0 TH |
450 | static u64 freezer_parent_freezing_read(struct cgroup_subsys_state *css, |
451 | struct cftype *cft) | |
a2252180 | 452 | { |
182446d0 | 453 | struct freezer *freezer = css_freezer(css); |
a2252180 TH |
454 | |
455 | return (bool)(freezer->state & CGROUP_FREEZING_PARENT); | |
456 | } | |
457 | ||
dc52ddc0 MH |
458 | static struct cftype files[] = { |
459 | { | |
460 | .name = "state", | |
4baf6e33 | 461 | .flags = CFTYPE_NOT_ON_ROOT, |
2da8ca82 | 462 | .seq_show = freezer_read, |
dc52ddc0 MH |
463 | .write_string = freezer_write, |
464 | }, | |
a2252180 TH |
465 | { |
466 | .name = "self_freezing", | |
467 | .flags = CFTYPE_NOT_ON_ROOT, | |
468 | .read_u64 = freezer_self_freezing_read, | |
469 | }, | |
470 | { | |
471 | .name = "parent_freezing", | |
472 | .flags = CFTYPE_NOT_ON_ROOT, | |
473 | .read_u64 = freezer_parent_freezing_read, | |
474 | }, | |
4baf6e33 | 475 | { } /* terminate */ |
dc52ddc0 MH |
476 | }; |
477 | ||
073219e9 | 478 | struct cgroup_subsys freezer_cgrp_subsys = { |
92fb9748 TH |
479 | .css_alloc = freezer_css_alloc, |
480 | .css_online = freezer_css_online, | |
481 | .css_offline = freezer_css_offline, | |
482 | .css_free = freezer_css_free, | |
8755ade6 | 483 | .attach = freezer_attach, |
dc52ddc0 | 484 | .fork = freezer_fork, |
4baf6e33 | 485 | .base_cftypes = files, |
dc52ddc0 | 486 | }; |