]>
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> | |
24 | ||
ef9fe980 TH |
25 | /* |
26 | * A cgroup is freezing if any FREEZING flags are set. FREEZING_SELF is | |
27 | * set if "FROZEN" is written to freezer.state cgroupfs file, and cleared | |
28 | * for "THAWED". FREEZING_PARENT is set if the parent freezer is FREEZING | |
29 | * for whatever reason. IOW, a cgroup has FREEZING_PARENT set if one of | |
30 | * its ancestors has FREEZING_SELF set. | |
31 | */ | |
d6a2fe13 | 32 | enum freezer_state_flags { |
5300a9b3 | 33 | CGROUP_FREEZER_ONLINE = (1 << 0), /* freezer is fully online */ |
a2252180 TH |
34 | CGROUP_FREEZING_SELF = (1 << 1), /* this freezer is freezing */ |
35 | CGROUP_FREEZING_PARENT = (1 << 2), /* the parent freezer is freezing */ | |
d6a2fe13 | 36 | CGROUP_FROZEN = (1 << 3), /* this and its descendants frozen */ |
a2252180 TH |
37 | |
38 | /* mask for all FREEZING flags */ | |
39 | CGROUP_FREEZING = CGROUP_FREEZING_SELF | CGROUP_FREEZING_PARENT, | |
dc52ddc0 MH |
40 | }; |
41 | ||
42 | struct freezer { | |
bcd66c89 | 43 | struct cgroup_subsys_state css; |
d6a2fe13 | 44 | unsigned int state; |
bcd66c89 | 45 | spinlock_t lock; |
dc52ddc0 MH |
46 | }; |
47 | ||
a7c6d554 TH |
48 | static inline struct freezer *css_freezer(struct cgroup_subsys_state *css) |
49 | { | |
50 | return css ? container_of(css, struct freezer, css) : NULL; | |
51 | } | |
52 | ||
bcd66c89 | 53 | static inline struct freezer *cgroup_freezer(struct cgroup *cgroup) |
dc52ddc0 | 54 | { |
a7c6d554 | 55 | return css_freezer(cgroup_css(cgroup, freezer_subsys_id)); |
dc52ddc0 MH |
56 | } |
57 | ||
58 | static inline struct freezer *task_freezer(struct task_struct *task) | |
59 | { | |
a7c6d554 | 60 | return css_freezer(task_css(task, freezer_subsys_id)); |
dc52ddc0 MH |
61 | } |
62 | ||
ef9fe980 TH |
63 | static struct freezer *parent_freezer(struct freezer *freezer) |
64 | { | |
63876986 | 65 | return css_freezer(css_parent(&freezer->css)); |
ef9fe980 TH |
66 | } |
67 | ||
22b4e111 | 68 | bool cgroup_freezing(struct task_struct *task) |
dc52ddc0 | 69 | { |
22b4e111 | 70 | bool ret; |
dc52ddc0 | 71 | |
22b4e111 | 72 | rcu_read_lock(); |
d6a2fe13 | 73 | ret = task_freezer(task)->state & CGROUP_FREEZING; |
22b4e111 TH |
74 | rcu_read_unlock(); |
75 | ||
76 | return ret; | |
dc52ddc0 MH |
77 | } |
78 | ||
79 | /* | |
80 | * cgroups_write_string() limits the size of freezer state strings to | |
81 | * CGROUP_LOCAL_BUFFER_SIZE | |
82 | */ | |
d6a2fe13 TH |
83 | static const char *freezer_state_strs(unsigned int state) |
84 | { | |
85 | if (state & CGROUP_FROZEN) | |
86 | return "FROZEN"; | |
87 | if (state & CGROUP_FREEZING) | |
88 | return "FREEZING"; | |
89 | return "THAWED"; | |
dc52ddc0 MH |
90 | }; |
91 | ||
dc52ddc0 MH |
92 | struct cgroup_subsys freezer_subsys; |
93 | ||
eb95419b TH |
94 | static struct cgroup_subsys_state * |
95 | freezer_css_alloc(struct cgroup_subsys_state *parent_css) | |
dc52ddc0 MH |
96 | { |
97 | struct freezer *freezer; | |
98 | ||
99 | freezer = kzalloc(sizeof(struct freezer), GFP_KERNEL); | |
100 | if (!freezer) | |
101 | return ERR_PTR(-ENOMEM); | |
102 | ||
103 | spin_lock_init(&freezer->lock); | |
dc52ddc0 MH |
104 | return &freezer->css; |
105 | } | |
106 | ||
5300a9b3 | 107 | /** |
eb95419b TH |
108 | * freezer_css_online - commit creation of a freezer css |
109 | * @css: css being created | |
5300a9b3 | 110 | * |
eb95419b | 111 | * We're committing to creation of @css. Mark it online and inherit |
ef9fe980 TH |
112 | * parent's freezing state while holding both parent's and our |
113 | * freezer->lock. | |
5300a9b3 | 114 | */ |
eb95419b | 115 | static int freezer_css_online(struct cgroup_subsys_state *css) |
dc52ddc0 | 116 | { |
eb95419b | 117 | struct freezer *freezer = css_freezer(css); |
ef9fe980 TH |
118 | struct freezer *parent = parent_freezer(freezer); |
119 | ||
120 | /* | |
121 | * The following double locking and freezing state inheritance | |
122 | * guarantee that @cgroup can never escape ancestors' freezing | |
123 | * states. See cgroup_for_each_descendant_pre() for details. | |
124 | */ | |
125 | if (parent) | |
126 | spin_lock_irq(&parent->lock); | |
127 | spin_lock_nested(&freezer->lock, SINGLE_DEPTH_NESTING); | |
a3201227 | 128 | |
5300a9b3 | 129 | freezer->state |= CGROUP_FREEZER_ONLINE; |
ef9fe980 TH |
130 | |
131 | if (parent && (parent->state & CGROUP_FREEZING)) { | |
132 | freezer->state |= CGROUP_FREEZING_PARENT | CGROUP_FROZEN; | |
133 | atomic_inc(&system_freezing_cnt); | |
134 | } | |
135 | ||
136 | spin_unlock(&freezer->lock); | |
137 | if (parent) | |
138 | spin_unlock_irq(&parent->lock); | |
b1929db4 TH |
139 | |
140 | return 0; | |
5300a9b3 TH |
141 | } |
142 | ||
143 | /** | |
eb95419b TH |
144 | * freezer_css_offline - initiate destruction of a freezer css |
145 | * @css: css being destroyed | |
5300a9b3 | 146 | * |
eb95419b TH |
147 | * @css is going away. Mark it dead and decrement system_freezing_count if |
148 | * it was holding one. | |
5300a9b3 | 149 | */ |
eb95419b | 150 | static void freezer_css_offline(struct cgroup_subsys_state *css) |
5300a9b3 | 151 | { |
eb95419b | 152 | struct freezer *freezer = css_freezer(css); |
5300a9b3 TH |
153 | |
154 | spin_lock_irq(&freezer->lock); | |
155 | ||
d6a2fe13 | 156 | if (freezer->state & CGROUP_FREEZING) |
a3201227 | 157 | atomic_dec(&system_freezing_cnt); |
5300a9b3 TH |
158 | |
159 | freezer->state = 0; | |
160 | ||
161 | spin_unlock_irq(&freezer->lock); | |
162 | } | |
163 | ||
eb95419b | 164 | static void freezer_css_free(struct cgroup_subsys_state *css) |
5300a9b3 | 165 | { |
eb95419b | 166 | kfree(css_freezer(css)); |
dc52ddc0 MH |
167 | } |
168 | ||
957a4eea | 169 | /* |
ead5c473 TH |
170 | * Tasks can be migrated into a different freezer anytime regardless of its |
171 | * current state. freezer_attach() is responsible for making new tasks | |
172 | * conform to the current state. | |
173 | * | |
174 | * Freezer state changes and task migration are synchronized via | |
175 | * @freezer->lock. freezer_attach() makes the new tasks conform to the | |
176 | * current state and all following state changes can see the new tasks. | |
957a4eea | 177 | */ |
eb95419b TH |
178 | static void freezer_attach(struct cgroup_subsys_state *new_css, |
179 | struct cgroup_taskset *tset) | |
dc52ddc0 | 180 | { |
eb95419b | 181 | struct freezer *freezer = css_freezer(new_css); |
bb9d97b6 | 182 | struct task_struct *task; |
ef9fe980 | 183 | bool clear_frozen = false; |
957a4eea | 184 | |
8755ade6 TH |
185 | spin_lock_irq(&freezer->lock); |
186 | ||
80a6a2cf | 187 | /* |
eb95419b | 188 | * Make the new tasks conform to the current state of @new_css. |
8755ade6 TH |
189 | * For simplicity, when migrating any task to a FROZEN cgroup, we |
190 | * revert it to FREEZING and let update_if_frozen() determine the | |
191 | * correct state later. | |
192 | * | |
eb95419b | 193 | * Tasks in @tset are on @new_css but may not conform to its |
8755ade6 TH |
194 | * current state before executing the following - !frozen tasks may |
195 | * be visible in a FROZEN cgroup and frozen tasks in a THAWED one. | |
80a6a2cf | 196 | */ |
eb95419b | 197 | cgroup_taskset_for_each(task, new_css->cgroup, tset) { |
d6a2fe13 | 198 | if (!(freezer->state & CGROUP_FREEZING)) { |
8755ade6 TH |
199 | __thaw_task(task); |
200 | } else { | |
201 | freeze_task(task); | |
d6a2fe13 | 202 | freezer->state &= ~CGROUP_FROZEN; |
ef9fe980 | 203 | clear_frozen = true; |
8755ade6 TH |
204 | } |
205 | } | |
dc52ddc0 | 206 | |
8755ade6 | 207 | spin_unlock_irq(&freezer->lock); |
ef9fe980 TH |
208 | |
209 | /* | |
210 | * Propagate FROZEN clearing upwards. We may race with | |
211 | * update_if_frozen(), but as long as both work bottom-up, either | |
212 | * update_if_frozen() sees child's FROZEN cleared or we clear the | |
213 | * parent's FROZEN later. No parent w/ !FROZEN children can be | |
214 | * left FROZEN. | |
215 | */ | |
216 | while (clear_frozen && (freezer = parent_freezer(freezer))) { | |
217 | spin_lock_irq(&freezer->lock); | |
218 | freezer->state &= ~CGROUP_FROZEN; | |
219 | clear_frozen = freezer->state & CGROUP_FREEZING; | |
220 | spin_unlock_irq(&freezer->lock); | |
221 | } | |
f780bdb7 BB |
222 | } |
223 | ||
761b3ef5 | 224 | static void freezer_fork(struct task_struct *task) |
dc52ddc0 MH |
225 | { |
226 | struct freezer *freezer; | |
227 | ||
8b46f880 | 228 | rcu_read_lock(); |
dc52ddc0 | 229 | freezer = task_freezer(task); |
dc52ddc0 | 230 | |
3b1b3f6e LZ |
231 | /* |
232 | * The root cgroup is non-freezable, so we can skip the | |
233 | * following check. | |
234 | */ | |
63876986 | 235 | if (!parent_freezer(freezer)) |
5edee61e | 236 | goto out; |
3b1b3f6e | 237 | |
dc52ddc0 | 238 | spin_lock_irq(&freezer->lock); |
d6a2fe13 | 239 | if (freezer->state & CGROUP_FREEZING) |
839e3407 | 240 | freeze_task(task); |
dc52ddc0 | 241 | spin_unlock_irq(&freezer->lock); |
5edee61e TH |
242 | out: |
243 | rcu_read_unlock(); | |
dc52ddc0 MH |
244 | } |
245 | ||
ef9fe980 TH |
246 | /** |
247 | * update_if_frozen - update whether a cgroup finished freezing | |
182446d0 | 248 | * @css: css of interest |
ef9fe980 TH |
249 | * |
250 | * Once FREEZING is initiated, transition to FROZEN is lazily updated by | |
251 | * calling this function. If the current state is FREEZING but not FROZEN, | |
252 | * this function checks whether all tasks of this cgroup and the descendant | |
253 | * cgroups finished freezing and, if so, sets FROZEN. | |
254 | * | |
255 | * The caller is responsible for grabbing RCU read lock and calling | |
256 | * update_if_frozen() on all descendants prior to invoking this function. | |
b4d18311 TH |
257 | * |
258 | * Task states and freezer state might disagree while tasks are being | |
182446d0 | 259 | * migrated into or out of @css, so we can't verify task states against |
ead5c473 | 260 | * @freezer state here. See freezer_attach() for details. |
dc52ddc0 | 261 | */ |
182446d0 | 262 | static void update_if_frozen(struct cgroup_subsys_state *css) |
dc52ddc0 | 263 | { |
182446d0 | 264 | struct freezer *freezer = css_freezer(css); |
ef9fe980 | 265 | struct cgroup *pos; |
dc52ddc0 MH |
266 | struct cgroup_iter it; |
267 | struct task_struct *task; | |
b4d18311 | 268 | |
ef9fe980 TH |
269 | WARN_ON_ONCE(!rcu_read_lock_held()); |
270 | ||
271 | spin_lock_irq(&freezer->lock); | |
272 | ||
d6a2fe13 TH |
273 | if (!(freezer->state & CGROUP_FREEZING) || |
274 | (freezer->state & CGROUP_FROZEN)) | |
ef9fe980 TH |
275 | goto out_unlock; |
276 | ||
277 | /* are all (live) children frozen? */ | |
182446d0 | 278 | cgroup_for_each_child(pos, css->cgroup) { |
ef9fe980 | 279 | struct freezer *child = cgroup_freezer(pos); |
dc52ddc0 | 280 | |
ef9fe980 TH |
281 | if ((child->state & CGROUP_FREEZER_ONLINE) && |
282 | !(child->state & CGROUP_FROZEN)) | |
283 | goto out_unlock; | |
284 | } | |
285 | ||
286 | /* are all tasks frozen? */ | |
182446d0 | 287 | cgroup_iter_start(css->cgroup, &it); |
b4d18311 | 288 | |
182446d0 | 289 | while ((task = cgroup_iter_next(css->cgroup, &it))) { |
3c426d5e | 290 | if (freezing(task)) { |
3c426d5e TH |
291 | /* |
292 | * freezer_should_skip() indicates that the task | |
293 | * should be skipped when determining freezing | |
294 | * completion. Consider it frozen in addition to | |
295 | * the usual frozen condition. | |
296 | */ | |
5d8f72b5 | 297 | if (!frozen(task) && !freezer_should_skip(task)) |
ef9fe980 | 298 | goto out_iter_end; |
3c426d5e | 299 | } |
dc52ddc0 MH |
300 | } |
301 | ||
d6a2fe13 | 302 | freezer->state |= CGROUP_FROZEN; |
ef9fe980 | 303 | out_iter_end: |
182446d0 | 304 | cgroup_iter_end(css->cgroup, &it); |
ef9fe980 TH |
305 | out_unlock: |
306 | spin_unlock_irq(&freezer->lock); | |
dc52ddc0 MH |
307 | } |
308 | ||
182446d0 | 309 | static int freezer_read(struct cgroup_subsys_state *css, struct cftype *cft, |
dc52ddc0 MH |
310 | struct seq_file *m) |
311 | { | |
ef9fe980 | 312 | struct cgroup *pos; |
dc52ddc0 | 313 | |
ef9fe980 | 314 | rcu_read_lock(); |
dc52ddc0 | 315 | |
ef9fe980 | 316 | /* update states bottom-up */ |
182446d0 TH |
317 | cgroup_for_each_descendant_post(pos, css->cgroup) |
318 | update_if_frozen(cgroup_css(pos, freezer_subsys_id)); | |
319 | update_if_frozen(css); | |
ef9fe980 TH |
320 | |
321 | rcu_read_unlock(); | |
322 | ||
182446d0 | 323 | seq_puts(m, freezer_state_strs(css_freezer(css)->state)); |
dc52ddc0 MH |
324 | seq_putc(m, '\n'); |
325 | return 0; | |
326 | } | |
327 | ||
bcd66c89 | 328 | static void freeze_cgroup(struct freezer *freezer) |
dc52ddc0 | 329 | { |
bcd66c89 | 330 | struct cgroup *cgroup = freezer->css.cgroup; |
dc52ddc0 MH |
331 | struct cgroup_iter it; |
332 | struct task_struct *task; | |
dc52ddc0 | 333 | |
dc52ddc0 | 334 | cgroup_iter_start(cgroup, &it); |
51f246ed TH |
335 | while ((task = cgroup_iter_next(cgroup, &it))) |
336 | freeze_task(task); | |
dc52ddc0 | 337 | cgroup_iter_end(cgroup, &it); |
dc52ddc0 MH |
338 | } |
339 | ||
bcd66c89 | 340 | static void unfreeze_cgroup(struct freezer *freezer) |
dc52ddc0 | 341 | { |
bcd66c89 | 342 | struct cgroup *cgroup = freezer->css.cgroup; |
dc52ddc0 MH |
343 | struct cgroup_iter it; |
344 | struct task_struct *task; | |
345 | ||
346 | cgroup_iter_start(cgroup, &it); | |
a5be2d0d TH |
347 | while ((task = cgroup_iter_next(cgroup, &it))) |
348 | __thaw_task(task); | |
dc52ddc0 | 349 | cgroup_iter_end(cgroup, &it); |
dc52ddc0 MH |
350 | } |
351 | ||
04a4ec32 TH |
352 | /** |
353 | * freezer_apply_state - apply state change to a single cgroup_freezer | |
354 | * @freezer: freezer to apply state change to | |
355 | * @freeze: whether to freeze or unfreeze | |
a2252180 TH |
356 | * @state: CGROUP_FREEZING_* flag to set or clear |
357 | * | |
358 | * Set or clear @state on @cgroup according to @freeze, and perform | |
359 | * freezing or thawing as necessary. | |
04a4ec32 | 360 | */ |
a2252180 TH |
361 | static void freezer_apply_state(struct freezer *freezer, bool freeze, |
362 | unsigned int state) | |
dc52ddc0 | 363 | { |
ead5c473 | 364 | /* also synchronizes against task migration, see freezer_attach() */ |
04a4ec32 | 365 | lockdep_assert_held(&freezer->lock); |
51308ee5 | 366 | |
5300a9b3 TH |
367 | if (!(freezer->state & CGROUP_FREEZER_ONLINE)) |
368 | return; | |
369 | ||
04a4ec32 | 370 | if (freeze) { |
d6a2fe13 | 371 | if (!(freezer->state & CGROUP_FREEZING)) |
a3201227 | 372 | atomic_inc(&system_freezing_cnt); |
a2252180 | 373 | freezer->state |= state; |
bcd66c89 | 374 | freeze_cgroup(freezer); |
04a4ec32 | 375 | } else { |
a2252180 TH |
376 | bool was_freezing = freezer->state & CGROUP_FREEZING; |
377 | ||
378 | freezer->state &= ~state; | |
379 | ||
380 | if (!(freezer->state & CGROUP_FREEZING)) { | |
381 | if (was_freezing) | |
382 | atomic_dec(&system_freezing_cnt); | |
383 | freezer->state &= ~CGROUP_FROZEN; | |
384 | unfreeze_cgroup(freezer); | |
385 | } | |
dc52ddc0 | 386 | } |
04a4ec32 | 387 | } |
22b4e111 | 388 | |
04a4ec32 TH |
389 | /** |
390 | * freezer_change_state - change the freezing state of a cgroup_freezer | |
391 | * @freezer: freezer of interest | |
392 | * @freeze: whether to freeze or thaw | |
393 | * | |
ef9fe980 TH |
394 | * Freeze or thaw @freezer according to @freeze. The operations are |
395 | * recursive - all descendants of @freezer will be affected. | |
04a4ec32 TH |
396 | */ |
397 | static void freezer_change_state(struct freezer *freezer, bool freeze) | |
398 | { | |
ef9fe980 TH |
399 | struct cgroup *pos; |
400 | ||
04a4ec32 TH |
401 | /* update @freezer */ |
402 | spin_lock_irq(&freezer->lock); | |
a2252180 | 403 | freezer_apply_state(freezer, freeze, CGROUP_FREEZING_SELF); |
dc52ddc0 | 404 | spin_unlock_irq(&freezer->lock); |
ef9fe980 TH |
405 | |
406 | /* | |
407 | * Update all its descendants in pre-order traversal. Each | |
408 | * descendant will try to inherit its parent's FREEZING state as | |
409 | * CGROUP_FREEZING_PARENT. | |
410 | */ | |
411 | rcu_read_lock(); | |
412 | cgroup_for_each_descendant_pre(pos, freezer->css.cgroup) { | |
413 | struct freezer *pos_f = cgroup_freezer(pos); | |
414 | struct freezer *parent = parent_freezer(pos_f); | |
415 | ||
416 | /* | |
417 | * Our update to @parent->state is already visible which is | |
418 | * all we need. No need to lock @parent. For more info on | |
419 | * synchronization, see freezer_post_create(). | |
420 | */ | |
421 | spin_lock_irq(&pos_f->lock); | |
422 | freezer_apply_state(pos_f, parent->state & CGROUP_FREEZING, | |
423 | CGROUP_FREEZING_PARENT); | |
424 | spin_unlock_irq(&pos_f->lock); | |
425 | } | |
426 | rcu_read_unlock(); | |
dc52ddc0 MH |
427 | } |
428 | ||
182446d0 | 429 | static int freezer_write(struct cgroup_subsys_state *css, struct cftype *cft, |
dc52ddc0 MH |
430 | const char *buffer) |
431 | { | |
04a4ec32 | 432 | bool freeze; |
dc52ddc0 | 433 | |
d6a2fe13 | 434 | if (strcmp(buffer, freezer_state_strs(0)) == 0) |
04a4ec32 | 435 | freeze = false; |
d6a2fe13 | 436 | else if (strcmp(buffer, freezer_state_strs(CGROUP_FROZEN)) == 0) |
04a4ec32 | 437 | freeze = true; |
dc52ddc0 | 438 | else |
3b1b3f6e | 439 | return -EINVAL; |
dc52ddc0 | 440 | |
182446d0 | 441 | freezer_change_state(css_freezer(css), freeze); |
51f246ed | 442 | return 0; |
dc52ddc0 MH |
443 | } |
444 | ||
182446d0 TH |
445 | static u64 freezer_self_freezing_read(struct cgroup_subsys_state *css, |
446 | struct cftype *cft) | |
a2252180 | 447 | { |
182446d0 | 448 | struct freezer *freezer = css_freezer(css); |
a2252180 TH |
449 | |
450 | return (bool)(freezer->state & CGROUP_FREEZING_SELF); | |
451 | } | |
452 | ||
182446d0 TH |
453 | static u64 freezer_parent_freezing_read(struct cgroup_subsys_state *css, |
454 | struct cftype *cft) | |
a2252180 | 455 | { |
182446d0 | 456 | struct freezer *freezer = css_freezer(css); |
a2252180 TH |
457 | |
458 | return (bool)(freezer->state & CGROUP_FREEZING_PARENT); | |
459 | } | |
460 | ||
dc52ddc0 MH |
461 | static struct cftype files[] = { |
462 | { | |
463 | .name = "state", | |
4baf6e33 | 464 | .flags = CFTYPE_NOT_ON_ROOT, |
dc52ddc0 MH |
465 | .read_seq_string = freezer_read, |
466 | .write_string = freezer_write, | |
467 | }, | |
a2252180 TH |
468 | { |
469 | .name = "self_freezing", | |
470 | .flags = CFTYPE_NOT_ON_ROOT, | |
471 | .read_u64 = freezer_self_freezing_read, | |
472 | }, | |
473 | { | |
474 | .name = "parent_freezing", | |
475 | .flags = CFTYPE_NOT_ON_ROOT, | |
476 | .read_u64 = freezer_parent_freezing_read, | |
477 | }, | |
4baf6e33 | 478 | { } /* terminate */ |
dc52ddc0 MH |
479 | }; |
480 | ||
dc52ddc0 MH |
481 | struct cgroup_subsys freezer_subsys = { |
482 | .name = "freezer", | |
92fb9748 TH |
483 | .css_alloc = freezer_css_alloc, |
484 | .css_online = freezer_css_online, | |
485 | .css_offline = freezer_css_offline, | |
486 | .css_free = freezer_css_free, | |
dc52ddc0 | 487 | .subsys_id = freezer_subsys_id, |
8755ade6 | 488 | .attach = freezer_attach, |
dc52ddc0 | 489 | .fork = freezer_fork, |
4baf6e33 | 490 | .base_cftypes = files, |
dc52ddc0 | 491 | }; |