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