Commit | Line | Data |
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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> | |
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 | { | |
5c9d535b | 62 | return css_freezer(freezer->css.parent); |
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 | ||
d6a2fe13 TH |
76 | static const char *freezer_state_strs(unsigned int state) |
77 | { | |
78 | if (state & CGROUP_FROZEN) | |
79 | return "FROZEN"; | |
80 | if (state & CGROUP_FREEZING) | |
81 | return "FREEZING"; | |
82 | return "THAWED"; | |
dc52ddc0 MH |
83 | }; |
84 | ||
eb95419b TH |
85 | static struct cgroup_subsys_state * |
86 | freezer_css_alloc(struct cgroup_subsys_state *parent_css) | |
dc52ddc0 MH |
87 | { |
88 | struct freezer *freezer; | |
89 | ||
90 | freezer = kzalloc(sizeof(struct freezer), GFP_KERNEL); | |
91 | if (!freezer) | |
92 | return ERR_PTR(-ENOMEM); | |
93 | ||
dc52ddc0 MH |
94 | return &freezer->css; |
95 | } | |
96 | ||
5300a9b3 | 97 | /** |
eb95419b TH |
98 | * freezer_css_online - commit creation of a freezer css |
99 | * @css: css being created | |
5300a9b3 | 100 | * |
eb95419b | 101 | * We're committing to creation of @css. Mark it online and inherit |
ef9fe980 TH |
102 | * parent's freezing state while holding both parent's and our |
103 | * freezer->lock. | |
5300a9b3 | 104 | */ |
eb95419b | 105 | static int freezer_css_online(struct cgroup_subsys_state *css) |
dc52ddc0 | 106 | { |
eb95419b | 107 | struct freezer *freezer = css_freezer(css); |
ef9fe980 TH |
108 | struct freezer *parent = parent_freezer(freezer); |
109 | ||
e5ced8eb | 110 | mutex_lock(&freezer_mutex); |
a3201227 | 111 | |
5300a9b3 | 112 | freezer->state |= CGROUP_FREEZER_ONLINE; |
ef9fe980 TH |
113 | |
114 | if (parent && (parent->state & CGROUP_FREEZING)) { | |
115 | freezer->state |= CGROUP_FREEZING_PARENT | CGROUP_FROZEN; | |
116 | atomic_inc(&system_freezing_cnt); | |
117 | } | |
118 | ||
e5ced8eb | 119 | mutex_unlock(&freezer_mutex); |
b1929db4 | 120 | return 0; |
5300a9b3 TH |
121 | } |
122 | ||
123 | /** | |
eb95419b TH |
124 | * freezer_css_offline - initiate destruction of a freezer css |
125 | * @css: css being destroyed | |
5300a9b3 | 126 | * |
eb95419b TH |
127 | * @css is going away. Mark it dead and decrement system_freezing_count if |
128 | * it was holding one. | |
5300a9b3 | 129 | */ |
eb95419b | 130 | static void freezer_css_offline(struct cgroup_subsys_state *css) |
5300a9b3 | 131 | { |
eb95419b | 132 | struct freezer *freezer = css_freezer(css); |
5300a9b3 | 133 | |
e5ced8eb | 134 | mutex_lock(&freezer_mutex); |
5300a9b3 | 135 | |
d6a2fe13 | 136 | if (freezer->state & CGROUP_FREEZING) |
a3201227 | 137 | atomic_dec(&system_freezing_cnt); |
5300a9b3 TH |
138 | |
139 | freezer->state = 0; | |
140 | ||
e5ced8eb | 141 | mutex_unlock(&freezer_mutex); |
5300a9b3 TH |
142 | } |
143 | ||
eb95419b | 144 | static void freezer_css_free(struct cgroup_subsys_state *css) |
5300a9b3 | 145 | { |
eb95419b | 146 | kfree(css_freezer(css)); |
dc52ddc0 MH |
147 | } |
148 | ||
957a4eea | 149 | /* |
ead5c473 TH |
150 | * Tasks can be migrated into a different freezer anytime regardless of its |
151 | * current state. freezer_attach() is responsible for making new tasks | |
152 | * conform to the current state. | |
153 | * | |
154 | * Freezer state changes and task migration are synchronized via | |
155 | * @freezer->lock. freezer_attach() makes the new tasks conform to the | |
156 | * current state and all following state changes can see the new tasks. | |
957a4eea | 157 | */ |
1f7dd3e5 | 158 | static void freezer_attach(struct cgroup_taskset *tset) |
dc52ddc0 | 159 | { |
bb9d97b6 | 160 | struct task_struct *task; |
1f7dd3e5 | 161 | struct cgroup_subsys_state *new_css; |
957a4eea | 162 | |
e5ced8eb | 163 | mutex_lock(&freezer_mutex); |
8755ade6 | 164 | |
80a6a2cf | 165 | /* |
eb95419b | 166 | * Make the new tasks conform to the current state of @new_css. |
8755ade6 TH |
167 | * For simplicity, when migrating any task to a FROZEN cgroup, we |
168 | * revert it to FREEZING and let update_if_frozen() determine the | |
169 | * correct state later. | |
170 | * | |
eb95419b | 171 | * Tasks in @tset are on @new_css but may not conform to its |
8755ade6 TH |
172 | * current state before executing the following - !frozen tasks may |
173 | * be visible in a FROZEN cgroup and frozen tasks in a THAWED one. | |
80a6a2cf | 174 | */ |
1f7dd3e5 | 175 | cgroup_taskset_for_each(task, new_css, tset) { |
599c963a TH |
176 | struct freezer *freezer = css_freezer(new_css); |
177 | ||
d6a2fe13 | 178 | if (!(freezer->state & CGROUP_FREEZING)) { |
8755ade6 TH |
179 | __thaw_task(task); |
180 | } else { | |
181 | freeze_task(task); | |
599c963a TH |
182 | /* clear FROZEN and propagate upwards */ |
183 | while (freezer && (freezer->state & CGROUP_FROZEN)) { | |
184 | freezer->state &= ~CGROUP_FROZEN; | |
185 | freezer = parent_freezer(freezer); | |
186 | } | |
8755ade6 TH |
187 | } |
188 | } | |
dc52ddc0 | 189 | |
e5ced8eb | 190 | mutex_unlock(&freezer_mutex); |
f780bdb7 BB |
191 | } |
192 | ||
a60bed29 TH |
193 | /** |
194 | * freezer_fork - cgroup post fork callback | |
195 | * @task: a task which has just been forked | |
196 | * | |
197 | * @task has just been created and should conform to the current state of | |
198 | * the cgroup_freezer it belongs to. This function may race against | |
199 | * freezer_attach(). Losing to freezer_attach() means that we don't have | |
200 | * to do anything as freezer_attach() will put @task into the appropriate | |
201 | * state. | |
202 | */ | |
b53202e6 | 203 | static void freezer_fork(struct task_struct *task) |
dc52ddc0 MH |
204 | { |
205 | struct freezer *freezer; | |
206 | ||
3b1b3f6e | 207 | /* |
a60bed29 TH |
208 | * The root cgroup is non-freezable, so we can skip locking the |
209 | * freezer. This is safe regardless of race with task migration. | |
210 | * If we didn't race or won, skipping is obviously the right thing | |
211 | * to do. If we lost and root is the new cgroup, noop is still the | |
212 | * right thing to do. | |
3b1b3f6e | 213 | */ |
e5ced8eb TH |
214 | if (task_css_is_root(task, freezer_cgrp_id)) |
215 | return; | |
3b1b3f6e | 216 | |
e5ced8eb TH |
217 | mutex_lock(&freezer_mutex); |
218 | rcu_read_lock(); | |
219 | ||
220 | freezer = task_freezer(task); | |
221 | if (freezer->state & CGROUP_FREEZING) | |
839e3407 | 222 | freeze_task(task); |
e5ced8eb | 223 | |
5edee61e | 224 | rcu_read_unlock(); |
e5ced8eb | 225 | mutex_unlock(&freezer_mutex); |
dc52ddc0 MH |
226 | } |
227 | ||
ef9fe980 TH |
228 | /** |
229 | * update_if_frozen - update whether a cgroup finished freezing | |
182446d0 | 230 | * @css: css of interest |
ef9fe980 TH |
231 | * |
232 | * Once FREEZING is initiated, transition to FROZEN is lazily updated by | |
233 | * calling this function. If the current state is FREEZING but not FROZEN, | |
234 | * this function checks whether all tasks of this cgroup and the descendant | |
235 | * cgroups finished freezing and, if so, sets FROZEN. | |
236 | * | |
237 | * The caller is responsible for grabbing RCU read lock and calling | |
238 | * update_if_frozen() on all descendants prior to invoking this function. | |
b4d18311 TH |
239 | * |
240 | * Task states and freezer state might disagree while tasks are being | |
182446d0 | 241 | * migrated into or out of @css, so we can't verify task states against |
ead5c473 | 242 | * @freezer state here. See freezer_attach() for details. |
dc52ddc0 | 243 | */ |
182446d0 | 244 | static void update_if_frozen(struct cgroup_subsys_state *css) |
dc52ddc0 | 245 | { |
182446d0 | 246 | struct freezer *freezer = css_freezer(css); |
492eb21b | 247 | struct cgroup_subsys_state *pos; |
72ec7029 | 248 | struct css_task_iter it; |
dc52ddc0 | 249 | struct task_struct *task; |
b4d18311 | 250 | |
e5ced8eb | 251 | lockdep_assert_held(&freezer_mutex); |
ef9fe980 | 252 | |
d6a2fe13 TH |
253 | if (!(freezer->state & CGROUP_FREEZING) || |
254 | (freezer->state & CGROUP_FROZEN)) | |
e5ced8eb | 255 | return; |
ef9fe980 TH |
256 | |
257 | /* are all (live) children frozen? */ | |
e5ced8eb | 258 | rcu_read_lock(); |
492eb21b TH |
259 | css_for_each_child(pos, css) { |
260 | struct freezer *child = css_freezer(pos); | |
dc52ddc0 | 261 | |
ef9fe980 | 262 | if ((child->state & CGROUP_FREEZER_ONLINE) && |
36e9d2eb TH |
263 | !(child->state & CGROUP_FROZEN)) { |
264 | rcu_read_unlock(); | |
e5ced8eb | 265 | return; |
36e9d2eb | 266 | } |
ef9fe980 | 267 | } |
e5ced8eb | 268 | rcu_read_unlock(); |
ef9fe980 TH |
269 | |
270 | /* are all tasks frozen? */ | |
72ec7029 | 271 | css_task_iter_start(css, &it); |
b4d18311 | 272 | |
72ec7029 | 273 | while ((task = css_task_iter_next(&it))) { |
3c426d5e | 274 | if (freezing(task)) { |
3c426d5e TH |
275 | /* |
276 | * freezer_should_skip() indicates that the task | |
277 | * should be skipped when determining freezing | |
278 | * completion. Consider it frozen in addition to | |
279 | * the usual frozen condition. | |
280 | */ | |
5d8f72b5 | 281 | if (!frozen(task) && !freezer_should_skip(task)) |
ef9fe980 | 282 | goto out_iter_end; |
3c426d5e | 283 | } |
dc52ddc0 MH |
284 | } |
285 | ||
d6a2fe13 | 286 | freezer->state |= CGROUP_FROZEN; |
ef9fe980 | 287 | out_iter_end: |
72ec7029 | 288 | css_task_iter_end(&it); |
dc52ddc0 MH |
289 | } |
290 | ||
2da8ca82 | 291 | static int freezer_read(struct seq_file *m, void *v) |
dc52ddc0 | 292 | { |
2da8ca82 | 293 | struct cgroup_subsys_state *css = seq_css(m), *pos; |
dc52ddc0 | 294 | |
e5ced8eb | 295 | mutex_lock(&freezer_mutex); |
ef9fe980 | 296 | rcu_read_lock(); |
dc52ddc0 | 297 | |
ef9fe980 | 298 | /* update states bottom-up */ |
e5ced8eb | 299 | css_for_each_descendant_post(pos, css) { |
ec903c0c | 300 | if (!css_tryget_online(pos)) |
e5ced8eb TH |
301 | continue; |
302 | rcu_read_unlock(); | |
303 | ||
492eb21b | 304 | update_if_frozen(pos); |
ef9fe980 | 305 | |
e5ced8eb TH |
306 | rcu_read_lock(); |
307 | css_put(pos); | |
308 | } | |
309 | ||
ef9fe980 | 310 | rcu_read_unlock(); |
e5ced8eb | 311 | mutex_unlock(&freezer_mutex); |
ef9fe980 | 312 | |
182446d0 | 313 | seq_puts(m, freezer_state_strs(css_freezer(css)->state)); |
dc52ddc0 MH |
314 | seq_putc(m, '\n'); |
315 | return 0; | |
316 | } | |
317 | ||
bcd66c89 | 318 | static void freeze_cgroup(struct freezer *freezer) |
dc52ddc0 | 319 | { |
72ec7029 | 320 | struct css_task_iter it; |
dc52ddc0 | 321 | struct task_struct *task; |
dc52ddc0 | 322 | |
72ec7029 TH |
323 | css_task_iter_start(&freezer->css, &it); |
324 | while ((task = css_task_iter_next(&it))) | |
51f246ed | 325 | freeze_task(task); |
72ec7029 | 326 | css_task_iter_end(&it); |
dc52ddc0 MH |
327 | } |
328 | ||
bcd66c89 | 329 | static void unfreeze_cgroup(struct freezer *freezer) |
dc52ddc0 | 330 | { |
72ec7029 | 331 | struct css_task_iter it; |
dc52ddc0 MH |
332 | struct task_struct *task; |
333 | ||
72ec7029 TH |
334 | css_task_iter_start(&freezer->css, &it); |
335 | while ((task = css_task_iter_next(&it))) | |
a5be2d0d | 336 | __thaw_task(task); |
72ec7029 | 337 | css_task_iter_end(&it); |
dc52ddc0 MH |
338 | } |
339 | ||
04a4ec32 TH |
340 | /** |
341 | * freezer_apply_state - apply state change to a single cgroup_freezer | |
342 | * @freezer: freezer to apply state change to | |
343 | * @freeze: whether to freeze or unfreeze | |
a2252180 TH |
344 | * @state: CGROUP_FREEZING_* flag to set or clear |
345 | * | |
346 | * Set or clear @state on @cgroup according to @freeze, and perform | |
347 | * freezing or thawing as necessary. | |
04a4ec32 | 348 | */ |
a2252180 TH |
349 | static void freezer_apply_state(struct freezer *freezer, bool freeze, |
350 | unsigned int state) | |
dc52ddc0 | 351 | { |
ead5c473 | 352 | /* also synchronizes against task migration, see freezer_attach() */ |
e5ced8eb | 353 | lockdep_assert_held(&freezer_mutex); |
51308ee5 | 354 | |
5300a9b3 TH |
355 | if (!(freezer->state & CGROUP_FREEZER_ONLINE)) |
356 | return; | |
357 | ||
04a4ec32 | 358 | if (freeze) { |
d6a2fe13 | 359 | if (!(freezer->state & CGROUP_FREEZING)) |
a3201227 | 360 | atomic_inc(&system_freezing_cnt); |
a2252180 | 361 | freezer->state |= state; |
bcd66c89 | 362 | freeze_cgroup(freezer); |
04a4ec32 | 363 | } else { |
a2252180 TH |
364 | bool was_freezing = freezer->state & CGROUP_FREEZING; |
365 | ||
366 | freezer->state &= ~state; | |
367 | ||
368 | if (!(freezer->state & CGROUP_FREEZING)) { | |
369 | if (was_freezing) | |
370 | atomic_dec(&system_freezing_cnt); | |
371 | freezer->state &= ~CGROUP_FROZEN; | |
372 | unfreeze_cgroup(freezer); | |
373 | } | |
dc52ddc0 | 374 | } |
04a4ec32 | 375 | } |
22b4e111 | 376 | |
04a4ec32 TH |
377 | /** |
378 | * freezer_change_state - change the freezing state of a cgroup_freezer | |
379 | * @freezer: freezer of interest | |
380 | * @freeze: whether to freeze or thaw | |
381 | * | |
ef9fe980 TH |
382 | * Freeze or thaw @freezer according to @freeze. The operations are |
383 | * recursive - all descendants of @freezer will be affected. | |
04a4ec32 TH |
384 | */ |
385 | static void freezer_change_state(struct freezer *freezer, bool freeze) | |
386 | { | |
492eb21b | 387 | struct cgroup_subsys_state *pos; |
ef9fe980 | 388 | |
ef9fe980 TH |
389 | /* |
390 | * Update all its descendants in pre-order traversal. Each | |
391 | * descendant will try to inherit its parent's FREEZING state as | |
392 | * CGROUP_FREEZING_PARENT. | |
393 | */ | |
e5ced8eb | 394 | mutex_lock(&freezer_mutex); |
ef9fe980 | 395 | rcu_read_lock(); |
492eb21b TH |
396 | css_for_each_descendant_pre(pos, &freezer->css) { |
397 | struct freezer *pos_f = css_freezer(pos); | |
ef9fe980 TH |
398 | struct freezer *parent = parent_freezer(pos_f); |
399 | ||
ec903c0c | 400 | if (!css_tryget_online(pos)) |
e5ced8eb TH |
401 | continue; |
402 | rcu_read_unlock(); | |
bd8815a6 | 403 | |
e5ced8eb | 404 | if (pos_f == freezer) |
bd8815a6 TH |
405 | freezer_apply_state(pos_f, freeze, |
406 | CGROUP_FREEZING_SELF); | |
e5ced8eb | 407 | else |
bd8815a6 TH |
408 | freezer_apply_state(pos_f, |
409 | parent->state & CGROUP_FREEZING, | |
410 | CGROUP_FREEZING_PARENT); | |
bd8815a6 | 411 | |
e5ced8eb TH |
412 | rcu_read_lock(); |
413 | css_put(pos); | |
ef9fe980 TH |
414 | } |
415 | rcu_read_unlock(); | |
e5ced8eb | 416 | mutex_unlock(&freezer_mutex); |
dc52ddc0 MH |
417 | } |
418 | ||
451af504 TH |
419 | static ssize_t freezer_write(struct kernfs_open_file *of, |
420 | char *buf, size_t nbytes, loff_t off) | |
dc52ddc0 | 421 | { |
04a4ec32 | 422 | bool freeze; |
dc52ddc0 | 423 | |
451af504 TH |
424 | buf = strstrip(buf); |
425 | ||
426 | if (strcmp(buf, freezer_state_strs(0)) == 0) | |
04a4ec32 | 427 | freeze = false; |
451af504 | 428 | else if (strcmp(buf, freezer_state_strs(CGROUP_FROZEN)) == 0) |
04a4ec32 | 429 | freeze = true; |
dc52ddc0 | 430 | else |
3b1b3f6e | 431 | return -EINVAL; |
dc52ddc0 | 432 | |
451af504 TH |
433 | freezer_change_state(css_freezer(of_css(of)), freeze); |
434 | return nbytes; | |
dc52ddc0 MH |
435 | } |
436 | ||
182446d0 TH |
437 | static u64 freezer_self_freezing_read(struct cgroup_subsys_state *css, |
438 | struct cftype *cft) | |
a2252180 | 439 | { |
182446d0 | 440 | struct freezer *freezer = css_freezer(css); |
a2252180 TH |
441 | |
442 | return (bool)(freezer->state & CGROUP_FREEZING_SELF); | |
443 | } | |
444 | ||
182446d0 TH |
445 | static u64 freezer_parent_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_PARENT); | |
451 | } | |
452 | ||
dc52ddc0 MH |
453 | static struct cftype files[] = { |
454 | { | |
455 | .name = "state", | |
4baf6e33 | 456 | .flags = CFTYPE_NOT_ON_ROOT, |
2da8ca82 | 457 | .seq_show = freezer_read, |
451af504 | 458 | .write = freezer_write, |
dc52ddc0 | 459 | }, |
a2252180 TH |
460 | { |
461 | .name = "self_freezing", | |
462 | .flags = CFTYPE_NOT_ON_ROOT, | |
463 | .read_u64 = freezer_self_freezing_read, | |
464 | }, | |
465 | { | |
466 | .name = "parent_freezing", | |
467 | .flags = CFTYPE_NOT_ON_ROOT, | |
468 | .read_u64 = freezer_parent_freezing_read, | |
469 | }, | |
4baf6e33 | 470 | { } /* terminate */ |
dc52ddc0 MH |
471 | }; |
472 | ||
073219e9 | 473 | struct cgroup_subsys freezer_cgrp_subsys = { |
92fb9748 TH |
474 | .css_alloc = freezer_css_alloc, |
475 | .css_online = freezer_css_online, | |
476 | .css_offline = freezer_css_offline, | |
477 | .css_free = freezer_css_free, | |
8755ade6 | 478 | .attach = freezer_attach, |
dc52ddc0 | 479 | .fork = freezer_fork, |
5577964e | 480 | .legacy_cftypes = files, |
dc52ddc0 | 481 | }; |