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d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
8e274523 LP |
2 | |
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
4ad49000 | 6 | Copyright 2013 Lennart Poettering |
8e274523 LP |
7 | |
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
8e274523 LP |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
8e274523 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
8e274523 LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
c6c18be3 | 22 | #include <fcntl.h> |
8c6db833 | 23 | |
9eb977db | 24 | #include "path-util.h" |
9444b1f2 | 25 | #include "special.h" |
4ad49000 LP |
26 | #include "cgroup-util.h" |
27 | #include "cgroup.h" | |
8e274523 | 28 | |
4ad49000 LP |
29 | void cgroup_context_init(CGroupContext *c) { |
30 | assert(c); | |
31 | ||
32 | /* Initialize everything to the kernel defaults, assuming the | |
33 | * structure is preinitialized to 0 */ | |
34 | ||
35 | c->cpu_shares = 1024; | |
36 | c->memory_limit = c->memory_soft_limit = (uint64_t) -1; | |
37 | c->blockio_weight = 1000; | |
38 | } | |
8e274523 | 39 | |
4ad49000 LP |
40 | void cgroup_context_free_device_allow(CGroupContext *c, CGroupDeviceAllow *a) { |
41 | assert(c); | |
42 | assert(a); | |
43 | ||
44 | LIST_REMOVE(CGroupDeviceAllow, device_allow, c->device_allow, a); | |
45 | free(a->path); | |
46 | free(a); | |
47 | } | |
48 | ||
49 | void cgroup_context_free_blockio_device_weight(CGroupContext *c, CGroupBlockIODeviceWeight *w) { | |
50 | assert(c); | |
51 | assert(w); | |
52 | ||
53 | LIST_REMOVE(CGroupBlockIODeviceWeight, device_weights, c->blockio_device_weights, w); | |
54 | free(w->path); | |
55 | free(w); | |
56 | } | |
57 | ||
58 | void cgroup_context_free_blockio_device_bandwidth(CGroupContext *c, CGroupBlockIODeviceBandwidth *b) { | |
59 | assert(c); | |
8e274523 | 60 | assert(b); |
8e274523 | 61 | |
4ad49000 LP |
62 | LIST_REMOVE(CGroupBlockIODeviceBandwidth, device_bandwidths, c->blockio_device_bandwidths, b); |
63 | free(b->path); | |
64 | free(b); | |
65 | } | |
66 | ||
67 | void cgroup_context_done(CGroupContext *c) { | |
68 | assert(c); | |
69 | ||
70 | while (c->blockio_device_weights) | |
71 | cgroup_context_free_blockio_device_weight(c, c->blockio_device_weights); | |
72 | ||
73 | while (c->blockio_device_bandwidths) | |
74 | cgroup_context_free_blockio_device_bandwidth(c, c->blockio_device_bandwidths); | |
75 | ||
76 | while (c->device_allow) | |
77 | cgroup_context_free_device_allow(c, c->device_allow); | |
78 | } | |
79 | ||
80 | void cgroup_context_dump(CGroupContext *c, FILE* f, const char *prefix) { | |
81 | CGroupBlockIODeviceBandwidth *b; | |
82 | CGroupBlockIODeviceWeight *w; | |
83 | CGroupDeviceAllow *a; | |
84 | ||
85 | assert(c); | |
86 | assert(f); | |
87 | ||
88 | prefix = strempty(prefix); | |
89 | ||
90 | fprintf(f, | |
91 | "%sCPUAccounting=%s\n" | |
92 | "%sBlockIOAccounting=%s\n" | |
93 | "%sMemoryAccounting=%s\n" | |
94 | "%sCPUShares=%lu\n" | |
95 | "%sBlockIOWeight%lu\n" | |
96 | "%sMemoryLimit=%" PRIu64 "\n" | |
97 | "%sMemorySoftLimit=%" PRIu64 "\n" | |
98 | "%sDevicePolicy=%s\n", | |
99 | prefix, yes_no(c->cpu_accounting), | |
100 | prefix, yes_no(c->blockio_accounting), | |
101 | prefix, yes_no(c->memory_accounting), | |
102 | prefix, c->cpu_shares, | |
103 | prefix, c->blockio_weight, | |
104 | prefix, c->memory_limit, | |
105 | prefix, c->memory_soft_limit, | |
106 | prefix, cgroup_device_policy_to_string(c->device_policy)); | |
107 | ||
108 | LIST_FOREACH(device_allow, a, c->device_allow) | |
109 | fprintf(f, | |
110 | "%sDeviceAllow=%s %s%s%s\n", | |
111 | prefix, | |
112 | a->path, | |
113 | a->r ? "r" : "", a->w ? "w" : "", a->m ? "m" : ""); | |
114 | ||
115 | LIST_FOREACH(device_weights, w, c->blockio_device_weights) | |
116 | fprintf(f, | |
117 | "%sBlockIOWeight=%s %lu", | |
118 | prefix, | |
119 | w->path, | |
120 | w->weight); | |
121 | ||
122 | LIST_FOREACH(device_bandwidths, b, c->blockio_device_bandwidths) { | |
123 | char buf[FORMAT_BYTES_MAX]; | |
124 | ||
125 | fprintf(f, | |
126 | "%s%s=%s %s\n", | |
127 | prefix, | |
128 | b->read ? "BlockIOReadBandwidth" : "BlockIOWriteBandwidth", | |
129 | b->path, | |
130 | format_bytes(buf, sizeof(buf), b->bandwidth)); | |
131 | } | |
132 | } | |
133 | ||
134 | static int lookup_blkio_device(const char *p, dev_t *dev) { | |
135 | struct stat st; | |
136 | int r; | |
137 | ||
138 | assert(p); | |
139 | assert(dev); | |
140 | ||
141 | r = stat(p, &st); | |
ab1f0633 | 142 | if (r < 0) { |
4ad49000 LP |
143 | log_warning("Couldn't stat device %s: %m", p); |
144 | return -errno; | |
ab1f0633 | 145 | } |
8e274523 | 146 | |
4ad49000 LP |
147 | if (S_ISBLK(st.st_mode)) |
148 | *dev = st.st_rdev; | |
149 | else if (major(st.st_dev) != 0) { | |
150 | /* If this is not a device node then find the block | |
151 | * device this file is stored on */ | |
152 | *dev = st.st_dev; | |
153 | ||
154 | /* If this is a partition, try to get the originating | |
155 | * block device */ | |
156 | block_get_whole_disk(*dev, dev); | |
157 | } else { | |
158 | log_warning("%s is not a block device and file system block device cannot be determined or is not local.", p); | |
159 | return -ENODEV; | |
160 | } | |
8e274523 | 161 | |
8e274523 | 162 | return 0; |
8e274523 LP |
163 | } |
164 | ||
4ad49000 LP |
165 | static int whitelist_device(const char *path, const char *node, const char *acc) { |
166 | char buf[2+DECIMAL_STR_MAX(dev_t)*2+2+4]; | |
167 | struct stat st; | |
8c6db833 | 168 | int r; |
8e274523 | 169 | |
4ad49000 LP |
170 | assert(path); |
171 | assert(acc); | |
8e274523 | 172 | |
4ad49000 LP |
173 | if (stat(node, &st) < 0) { |
174 | log_warning("Couldn't stat device %s", node); | |
175 | return -errno; | |
176 | } | |
177 | ||
178 | if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) { | |
179 | log_warning("%s is not a device.", node); | |
180 | return -ENODEV; | |
181 | } | |
182 | ||
183 | sprintf(buf, | |
184 | "%c %u:%u %s", | |
185 | S_ISCHR(st.st_mode) ? 'c' : 'b', | |
186 | major(st.st_rdev), minor(st.st_rdev), | |
187 | acc); | |
188 | ||
189 | r = cg_set_attribute("devices", path, "devices.allow", buf); | |
190 | if (r < 0) | |
191 | log_warning("Failed to set devices.allow on %s: %s", path, strerror(-r)); | |
192 | ||
193 | return r; | |
8e274523 LP |
194 | } |
195 | ||
4ad49000 LP |
196 | void cgroup_context_apply(CGroupContext *c, CGroupControllerMask mask, const char *path) { |
197 | int r; | |
198 | ||
199 | assert(c); | |
200 | assert(path); | |
8e274523 | 201 | |
4ad49000 LP |
202 | if (mask == 0) |
203 | return; | |
8e274523 | 204 | |
4ad49000 LP |
205 | if (mask & CGROUP_CPU) { |
206 | char buf[DECIMAL_STR_MAX(unsigned long) + 1]; | |
8e274523 | 207 | |
4ad49000 LP |
208 | sprintf(buf, "%lu\n", c->cpu_shares); |
209 | r = cg_set_attribute("cpu", path, "cpu.shares", buf); | |
210 | if (r < 0) | |
211 | log_warning("Failed to set cpu.shares on %s: %s", path, strerror(-r)); | |
212 | } | |
213 | ||
214 | if (mask & CGROUP_BLKIO) { | |
215 | char buf[MAX3(DECIMAL_STR_MAX(unsigned long)+1, | |
216 | DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(unsigned long)*1, | |
217 | DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1)]; | |
218 | CGroupBlockIODeviceWeight *w; | |
219 | CGroupBlockIODeviceBandwidth *b; | |
220 | ||
221 | sprintf(buf, "%lu\n", c->blockio_weight); | |
222 | r = cg_set_attribute("blkio", path, "blkio.weight", buf); | |
223 | if (r < 0) | |
224 | log_warning("Failed to set blkio.weight on %s: %s", path, strerror(-r)); | |
225 | ||
226 | /* FIXME: no way to reset this list */ | |
227 | LIST_FOREACH(device_weights, w, c->blockio_device_weights) { | |
228 | dev_t dev; | |
229 | ||
230 | r = lookup_blkio_device(w->path, &dev); | |
231 | if (r < 0) | |
232 | continue; | |
8e274523 | 233 | |
4ad49000 LP |
234 | sprintf(buf, "%u:%u %lu", major(dev), minor(dev), w->weight); |
235 | r = cg_set_attribute("blkio", path, "blkio.weight_device", buf); | |
236 | if (r < 0) | |
237 | log_error("Failed to set blkio.weight_device on %s: %s", path, strerror(-r)); | |
238 | } | |
239 | ||
240 | /* FIXME: no way to reset this list */ | |
241 | LIST_FOREACH(device_bandwidths, b, c->blockio_device_bandwidths) { | |
242 | const char *a; | |
243 | dev_t dev; | |
244 | ||
245 | r = lookup_blkio_device(b->path, &dev); | |
246 | if (r < 0) | |
247 | continue; | |
248 | ||
249 | a = b->read ? "blkio.throttle.read_bps_device" : "blkio.throttle.write_bps_device"; | |
250 | ||
251 | sprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), b->bandwidth); | |
252 | r = cg_set_attribute("blkio", path, a, buf); | |
253 | if (r < 0) | |
254 | log_error("Failed to set %s on %s: %s", a, path, strerror(-r)); | |
d686d8a9 | 255 | } |
8e274523 LP |
256 | } |
257 | ||
4ad49000 LP |
258 | if (mask & CGROUP_MEMORY) { |
259 | char buf[DECIMAL_STR_MAX(uint64_t) + 1]; | |
8e274523 | 260 | |
4ad49000 LP |
261 | sprintf(buf, "%" PRIu64 "\n", c->memory_limit); |
262 | r = cg_set_attribute("memory", path, "memory.limit_in_bytes", buf); | |
263 | if (r < 0) | |
264 | log_error("Failed to set memory.limit_in_bytes on %s: %s", path, strerror(-r)); | |
8e274523 | 265 | |
4ad49000 LP |
266 | sprintf(buf, "%" PRIu64 "\n", c->memory_soft_limit); |
267 | cg_set_attribute("memory", path, "memory.soft_limit_in_bytes", buf); | |
268 | if (r < 0) | |
269 | log_error("Failed to set memory.limit_in_bytes on %s: %s", path, strerror(-r)); | |
270 | } | |
8e274523 | 271 | |
4ad49000 LP |
272 | if (mask & CGROUP_DEVICE) { |
273 | CGroupDeviceAllow *a; | |
8e274523 | 274 | |
4ad49000 LP |
275 | if (c->device_allow || c->device_policy != CGROUP_AUTO) |
276 | r = cg_set_attribute("devices", path, "devices.deny", "a"); | |
277 | else | |
278 | r = cg_set_attribute("devices", path, "devices.allow", "a"); | |
279 | if (r < 0) | |
280 | log_error("Failed to reset devices.list on %s: %s", path, strerror(-r)); | |
fb385181 | 281 | |
4ad49000 LP |
282 | if (c->device_policy == CGROUP_CLOSED || |
283 | (c->device_policy == CGROUP_AUTO && c->device_allow)) { | |
284 | static const char auto_devices[] = | |
285 | "/dev/null\0" "rw\0" | |
286 | "/dev/zero\0" "rw\0" | |
287 | "/dev/full\0" "rw\0" | |
288 | "/dev/random\0" "rw\0" | |
289 | "/dev/urandom\0" "rw\0"; | |
290 | ||
291 | const char *x, *y; | |
292 | ||
293 | NULSTR_FOREACH_PAIR(x, y, auto_devices) | |
294 | whitelist_device(path, x, y); | |
295 | } | |
296 | ||
297 | LIST_FOREACH(device_allow, a, c->device_allow) { | |
298 | char acc[4]; | |
299 | unsigned k = 0; | |
300 | ||
301 | if (a->r) | |
302 | acc[k++] = 'r'; | |
303 | if (a->w) | |
304 | acc[k++] = 'w'; | |
305 | if (a->m) | |
306 | acc[k++] = 'm'; | |
fb385181 | 307 | |
4ad49000 LP |
308 | if (k == 0) |
309 | continue; | |
fb385181 | 310 | |
4ad49000 LP |
311 | acc[k++] = 0; |
312 | whitelist_device(path, a->path, acc); | |
313 | } | |
314 | } | |
fb385181 LP |
315 | } |
316 | ||
4ad49000 LP |
317 | CGroupControllerMask cgroup_context_get_mask(CGroupContext *c) { |
318 | CGroupControllerMask mask = 0; | |
8e274523 | 319 | |
4ad49000 | 320 | /* Figure out which controllers we need */ |
8e274523 | 321 | |
4ad49000 LP |
322 | if (c->cpu_accounting || c->cpu_shares != 1024) |
323 | mask |= CGROUP_CPUACCT | CGROUP_CPU; | |
ecedd90f | 324 | |
4ad49000 LP |
325 | if (c->blockio_accounting || |
326 | c->blockio_weight != 1000 || | |
327 | c->blockio_device_weights || | |
328 | c->blockio_device_bandwidths) | |
329 | mask |= CGROUP_BLKIO; | |
ecedd90f | 330 | |
4ad49000 LP |
331 | if (c->memory_accounting || |
332 | c->memory_limit != (uint64_t) -1 || | |
333 | c->memory_soft_limit != (uint64_t) -1) | |
334 | mask |= CGROUP_MEMORY; | |
8e274523 | 335 | |
4ad49000 LP |
336 | if (c->device_allow || c->device_policy != CGROUP_AUTO) |
337 | mask |= CGROUP_DEVICE; | |
338 | ||
339 | return mask; | |
8e274523 LP |
340 | } |
341 | ||
4ad49000 LP |
342 | static CGroupControllerMask unit_get_cgroup_mask(Unit *u) { |
343 | CGroupContext *c; | |
8e274523 | 344 | |
4ad49000 LP |
345 | c = unit_get_cgroup_context(u); |
346 | if (!c) | |
347 | return 0; | |
8e274523 | 348 | |
4ad49000 | 349 | return cgroup_context_get_mask(c); |
8e274523 LP |
350 | } |
351 | ||
4ad49000 LP |
352 | static CGroupControllerMask unit_get_members_mask(Unit *u) { |
353 | CGroupControllerMask mask = 0; | |
354 | Unit *m; | |
355 | Iterator i; | |
246aa6dd | 356 | |
4ad49000 | 357 | assert(u); |
246aa6dd | 358 | |
4ad49000 | 359 | SET_FOREACH(m, u->dependencies[UNIT_BEFORE], i) { |
246aa6dd | 360 | |
4ad49000 | 361 | if (UNIT_DEREF(m->slice) != u) |
246aa6dd LP |
362 | continue; |
363 | ||
4ad49000 | 364 | mask |= unit_get_cgroup_mask(m) | unit_get_members_mask(m); |
246aa6dd LP |
365 | } |
366 | ||
4ad49000 | 367 | return mask; |
246aa6dd LP |
368 | } |
369 | ||
4ad49000 LP |
370 | static CGroupControllerMask unit_get_siblings_mask(Unit *u) { |
371 | assert(u); | |
246aa6dd | 372 | |
4ad49000 LP |
373 | if (!UNIT_ISSET(u->slice)) |
374 | return 0; | |
375 | ||
376 | /* Sibling propagation is only relevant for weight-based | |
377 | * controllers, so let's mask out everything else */ | |
378 | return unit_get_members_mask(UNIT_DEREF(u->slice)) & | |
379 | (CGROUP_CPU|CGROUP_BLKIO|CGROUP_CPUACCT); | |
246aa6dd LP |
380 | } |
381 | ||
4ad49000 LP |
382 | static int unit_create_cgroups(Unit *u, CGroupControllerMask mask) { |
383 | char *path = NULL; | |
384 | int r; | |
64747e2d | 385 | |
4ad49000 | 386 | assert(u); |
64747e2d | 387 | |
4ad49000 LP |
388 | path = unit_default_cgroup_path(u); |
389 | if (!path) | |
390 | return -ENOMEM; | |
64747e2d | 391 | |
4ad49000 LP |
392 | /* First, create our own group */ |
393 | r = cg_create_with_mask(mask, path); | |
394 | if (r < 0) | |
395 | log_error("Failed to create cgroup %s: %s", path, strerror(-r)); | |
64747e2d | 396 | |
4ad49000 LP |
397 | /* Then, possibly move things over */ |
398 | if (u->cgroup_path && !streq(path, u->cgroup_path)) { | |
399 | r = cg_migrate_with_mask(mask, u->cgroup_path, path); | |
64747e2d | 400 | if (r < 0) |
4ad49000 | 401 | log_error("Failed to migrate cgroup %s: %s", path, strerror(-r)); |
64747e2d LP |
402 | } |
403 | ||
4ad49000 LP |
404 | /* And remember the new data */ |
405 | free(u->cgroup_path); | |
406 | u->cgroup_path = path; | |
407 | u->cgroup_realized = true; | |
408 | u->cgroup_mask = mask; | |
409 | ||
64747e2d LP |
410 | return 0; |
411 | } | |
412 | ||
4ad49000 LP |
413 | static void unit_realize_cgroup_now(Unit *u) { |
414 | CGroupControllerMask mask; | |
64747e2d | 415 | |
4ad49000 | 416 | assert(u); |
64747e2d | 417 | |
4ad49000 LP |
418 | if (u->in_cgroup_queue) { |
419 | LIST_REMOVE(Unit, cgroup_queue, u->manager->cgroup_queue, u); | |
420 | u->in_cgroup_queue = false; | |
421 | } | |
64747e2d | 422 | |
4ad49000 LP |
423 | mask = unit_get_cgroup_mask(u) | unit_get_members_mask(u) | unit_get_siblings_mask(u); |
424 | mask &= u->manager->cgroup_supported; | |
64747e2d | 425 | |
4ad49000 LP |
426 | if (u->cgroup_realized && |
427 | u->cgroup_mask == mask) | |
428 | return; | |
64747e2d | 429 | |
4ad49000 LP |
430 | /* First, realize parents */ |
431 | if (UNIT_ISSET(u->slice)) | |
432 | unit_realize_cgroup_now(UNIT_DEREF(u->slice)); | |
433 | ||
434 | /* And then do the real work */ | |
435 | unit_create_cgroups(u, mask); | |
64747e2d LP |
436 | } |
437 | ||
4ad49000 | 438 | static void unit_add_to_cgroup_queue(Unit *u) { |
ecedd90f | 439 | |
4ad49000 LP |
440 | if (u->in_cgroup_queue) |
441 | return; | |
8e274523 | 442 | |
4ad49000 LP |
443 | LIST_PREPEND(Unit, cgroup_queue, u->manager->cgroup_queue, u); |
444 | u->in_cgroup_queue = true; | |
445 | } | |
8c6db833 | 446 | |
4ad49000 LP |
447 | unsigned manager_dispatch_cgroup_queue(Manager *m) { |
448 | Unit *i; | |
449 | unsigned n = 0; | |
ecedd90f | 450 | |
4ad49000 LP |
451 | while ((i = m->cgroup_queue)) { |
452 | assert(i->in_cgroup_queue); | |
ecedd90f | 453 | |
4ad49000 LP |
454 | unit_realize_cgroup_now(i); |
455 | cgroup_context_apply(unit_get_cgroup_context(i), i->cgroup_mask, i->cgroup_path); | |
456 | n++; | |
457 | } | |
ecedd90f | 458 | |
4ad49000 | 459 | return n; |
8e274523 LP |
460 | } |
461 | ||
4ad49000 LP |
462 | static void unit_queue_siblings(Unit *u) { |
463 | Unit *slice; | |
ca949c9d | 464 | |
4ad49000 LP |
465 | /* This adds the siblings of the specified unit and the |
466 | * siblings of all parent units to the cgroup queue. (But | |
467 | * neither the specified unit itself nor the parents.) */ | |
468 | ||
469 | while ((slice = UNIT_DEREF(u->slice))) { | |
470 | Iterator i; | |
471 | Unit *m; | |
8f53a7b8 | 472 | |
4ad49000 LP |
473 | SET_FOREACH(m, slice->dependencies[UNIT_BEFORE], i) { |
474 | if (m == u) | |
475 | continue; | |
8e274523 | 476 | |
4ad49000 | 477 | if (UNIT_DEREF(m->slice) != slice) |
50159e6a | 478 | continue; |
8e274523 | 479 | |
4ad49000 | 480 | unit_add_to_cgroup_queue(m); |
50159e6a LP |
481 | } |
482 | ||
4ad49000 | 483 | u = slice; |
8e274523 | 484 | } |
4ad49000 LP |
485 | } |
486 | ||
487 | void unit_realize_cgroup(Unit *u) { | |
488 | CGroupContext *c; | |
489 | ||
490 | assert(u); | |
491 | ||
492 | c = unit_get_cgroup_context(u); | |
493 | if (!c) | |
494 | return; | |
8e274523 | 495 | |
4ad49000 LP |
496 | /* So, here's the deal: when realizing the cgroups for this |
497 | * unit, we need to first create all parents, but there's more | |
498 | * actually: for the weight-based controllers we also need to | |
499 | * make sure that all our siblings (i.e. units that are in the | |
500 | * same slice as we are) have cgroup too. Otherwise things | |
501 | * would become very uneven as each of their processes would | |
502 | * get as much resources as all our group together. This call | |
503 | * will synchronously create the parent cgroups, but will | |
504 | * defer work on the siblings to the next event loop | |
505 | * iteration. */ | |
ca949c9d | 506 | |
4ad49000 LP |
507 | /* Add all sibling slices to the cgroup queue. */ |
508 | unit_queue_siblings(u); | |
509 | ||
510 | /* And realize this one now */ | |
511 | unit_realize_cgroup_now(u); | |
512 | ||
513 | /* And apply the values */ | |
514 | cgroup_context_apply(c, u->cgroup_mask, u->cgroup_path); | |
8e274523 LP |
515 | } |
516 | ||
4ad49000 | 517 | void unit_destroy_cgroup(Unit *u) { |
8e274523 LP |
518 | int r; |
519 | ||
4ad49000 | 520 | assert(u); |
8e274523 | 521 | |
4ad49000 LP |
522 | if (!u->cgroup_path) |
523 | return; | |
8e274523 | 524 | |
4ad49000 LP |
525 | r = cg_trim_with_mask(u->cgroup_mask, u->cgroup_path, true); |
526 | if (r < 0) | |
527 | log_error("Failed to destroy cgroup %s: %s", u->cgroup_path, strerror(-r)); | |
8e274523 | 528 | |
4ad49000 LP |
529 | free(u->cgroup_path); |
530 | u->cgroup_path = NULL; | |
531 | u->cgroup_realized = false; | |
532 | u->cgroup_mask = 0; | |
8e274523 LP |
533 | } |
534 | ||
4ad49000 LP |
535 | pid_t unit_search_main_pid(Unit *u) { |
536 | _cleanup_fclose_ FILE *f = NULL; | |
537 | pid_t pid = 0, npid, mypid; | |
538 | ||
539 | assert(u); | |
540 | ||
541 | if (!u->cgroup_path) | |
542 | return 0; | |
543 | ||
544 | if (cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &f) < 0) | |
545 | return 0; | |
546 | ||
547 | mypid = getpid(); | |
548 | while (cg_read_pid(f, &npid) > 0) { | |
549 | pid_t ppid; | |
550 | ||
551 | if (npid == pid) | |
552 | continue; | |
8e274523 | 553 | |
4ad49000 LP |
554 | /* Ignore processes that aren't our kids */ |
555 | if (get_parent_of_pid(npid, &ppid) >= 0 && ppid != mypid) | |
556 | continue; | |
8e274523 | 557 | |
4ad49000 LP |
558 | if (pid != 0) { |
559 | /* Dang, there's more than one daemonized PID | |
560 | in this group, so we don't know what process | |
561 | is the main process. */ | |
562 | pid = 0; | |
563 | break; | |
564 | } | |
8e274523 | 565 | |
4ad49000 | 566 | pid = npid; |
8e274523 LP |
567 | } |
568 | ||
4ad49000 | 569 | return pid; |
8e274523 LP |
570 | } |
571 | ||
8e274523 | 572 | int manager_setup_cgroup(Manager *m) { |
9444b1f2 | 573 | _cleanup_free_ char *path = NULL; |
8e274523 | 574 | int r; |
9444b1f2 | 575 | char *e, *a; |
8e274523 LP |
576 | |
577 | assert(m); | |
578 | ||
e5a53dc7 | 579 | /* 0. Be nice to Ingo Molnar #628004 */ |
0c85a4f3 | 580 | if (path_is_mount_point("/sys/fs/cgroup/systemd", false) <= 0) { |
e5a53dc7 LP |
581 | log_warning("No control group support available, not creating root group."); |
582 | return 0; | |
583 | } | |
584 | ||
35d2e7ec | 585 | /* 1. Determine hierarchy */ |
9444b1f2 LP |
586 | free(m->cgroup_root); |
587 | m->cgroup_root = NULL; | |
588 | ||
589 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &m->cgroup_root); | |
9156e799 | 590 | if (r < 0) { |
12235040 | 591 | log_error("Cannot determine cgroup we are running in: %s", strerror(-r)); |
a32360f1 | 592 | return r; |
12235040 | 593 | } |
8e274523 | 594 | |
9444b1f2 LP |
595 | /* Already in /system.slice? If so, let's cut this off again */ |
596 | if (m->running_as == SYSTEMD_SYSTEM) { | |
597 | e = endswith(m->cgroup_root, "/" SPECIAL_SYSTEM_SLICE); | |
598 | if (e) | |
599 | *e = 0; | |
0baf24dd | 600 | } |
7ccfb64a | 601 | |
9444b1f2 LP |
602 | /* And make sure to store away the root value without trailing |
603 | * slash, even for the root dir, so that we can easily prepend | |
604 | * it everywhere. */ | |
605 | if (streq(m->cgroup_root, "/")) | |
606 | m->cgroup_root[0] = 0; | |
8e274523 | 607 | |
35d2e7ec | 608 | /* 2. Show data */ |
9444b1f2 | 609 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, NULL, &path); |
3474ae3c | 610 | if (r < 0) { |
12235040 | 611 | log_error("Cannot find cgroup mount point: %s", strerror(-r)); |
a32360f1 | 612 | return r; |
12235040 | 613 | } |
8e274523 | 614 | |
c6c18be3 LP |
615 | log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path); |
616 | ||
35d2e7ec | 617 | /* 3. Install agent */ |
a32360f1 LP |
618 | if (m->running_as == SYSTEMD_SYSTEM) { |
619 | r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH); | |
620 | if (r < 0) | |
621 | log_warning("Failed to install release agent, ignoring: %s", strerror(-r)); | |
622 | else if (r > 0) | |
623 | log_debug("Installed release agent."); | |
624 | else | |
625 | log_debug("Release agent already installed."); | |
626 | } | |
8e274523 | 627 | |
9444b1f2 LP |
628 | /* 4. Realize the system slice and put us in there */ |
629 | a = strappenda(m->cgroup_root, "/" SPECIAL_SYSTEM_SLICE); | |
630 | r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, a, 0); | |
9156e799 | 631 | if (r < 0) { |
8e274523 | 632 | log_error("Failed to create root cgroup hierarchy: %s", strerror(-r)); |
a32360f1 | 633 | return r; |
c6c18be3 LP |
634 | } |
635 | ||
35d2e7ec | 636 | /* 5. And pin it, so that it cannot be unmounted */ |
c6c18be3 LP |
637 | if (m->pin_cgroupfs_fd >= 0) |
638 | close_nointr_nofail(m->pin_cgroupfs_fd); | |
639 | ||
9156e799 LP |
640 | m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK); |
641 | if (r < 0) { | |
12235040 | 642 | log_error("Failed to open pin file: %m"); |
a32360f1 | 643 | return -errno; |
c6c18be3 LP |
644 | } |
645 | ||
4ad49000 LP |
646 | /* 6. Figure out which controllers are supported */ |
647 | m->cgroup_supported = cg_mask_supported(); | |
9156e799 | 648 | |
a32360f1 | 649 | return 0; |
8e274523 LP |
650 | } |
651 | ||
c6c18be3 | 652 | void manager_shutdown_cgroup(Manager *m, bool delete) { |
8e274523 LP |
653 | assert(m); |
654 | ||
9444b1f2 LP |
655 | /* We can't really delete the group, since we are in it. But |
656 | * let's trim it. */ | |
657 | if (delete && m->cgroup_root) | |
658 | cg_trim(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, false); | |
8e274523 | 659 | |
c6c18be3 LP |
660 | if (m->pin_cgroupfs_fd >= 0) { |
661 | close_nointr_nofail(m->pin_cgroupfs_fd); | |
662 | m->pin_cgroupfs_fd = -1; | |
663 | } | |
664 | ||
9444b1f2 LP |
665 | free(m->cgroup_root); |
666 | m->cgroup_root = NULL; | |
8e274523 LP |
667 | } |
668 | ||
4ad49000 | 669 | Unit* manager_get_unit_by_cgroup(Manager *m, const char *cgroup) { |
acb14d31 | 670 | char *p; |
4ad49000 | 671 | Unit *u; |
acb14d31 LP |
672 | |
673 | assert(m); | |
674 | assert(cgroup); | |
acb14d31 | 675 | |
4ad49000 LP |
676 | u = hashmap_get(m->cgroup_unit, cgroup); |
677 | if (u) | |
678 | return u; | |
acb14d31 | 679 | |
8e70580b | 680 | p = strdupa(cgroup); |
acb14d31 LP |
681 | for (;;) { |
682 | char *e; | |
683 | ||
684 | e = strrchr(p, '/'); | |
4ad49000 LP |
685 | if (e == p || !e) |
686 | return NULL; | |
acb14d31 LP |
687 | |
688 | *e = 0; | |
689 | ||
4ad49000 LP |
690 | u = hashmap_get(m->cgroup_unit, p); |
691 | if (u) | |
692 | return u; | |
acb14d31 LP |
693 | } |
694 | } | |
695 | ||
4ad49000 LP |
696 | Unit *manager_get_unit_by_pid(Manager *m, pid_t pid) { |
697 | _cleanup_free_ char *cgroup = NULL; | |
acb14d31 | 698 | int r; |
8e274523 | 699 | |
8c47c732 LP |
700 | assert(m); |
701 | ||
702 | if (pid <= 1) | |
703 | return NULL; | |
704 | ||
4ad49000 LP |
705 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &cgroup); |
706 | if (r < 0) | |
6dde1f33 LP |
707 | return NULL; |
708 | ||
4ad49000 | 709 | return manager_get_unit_by_cgroup(m, cgroup); |
6dde1f33 | 710 | } |
4fbf50b3 | 711 | |
4ad49000 LP |
712 | int manager_notify_cgroup_empty(Manager *m, const char *cgroup) { |
713 | Unit *u; | |
714 | int r; | |
4fbf50b3 | 715 | |
4ad49000 LP |
716 | assert(m); |
717 | assert(cgroup); | |
4fbf50b3 | 718 | |
4ad49000 LP |
719 | r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, cgroup, true); |
720 | if (r == 0) | |
4fbf50b3 LP |
721 | return 0; |
722 | ||
4ad49000 LP |
723 | u = manager_get_unit_by_cgroup(m, cgroup); |
724 | if (u && UNIT_VTABLE(u)->notify_cgroup_empty) | |
725 | UNIT_VTABLE(u)->notify_cgroup_empty(u); | |
2633eb83 | 726 | |
4ad49000 | 727 | return 0; |
4fbf50b3 LP |
728 | } |
729 | ||
4ad49000 LP |
730 | static const char* const cgroup_device_policy_table[_CGROUP_DEVICE_POLICY_MAX] = { |
731 | [CGROUP_AUTO] = "auto", | |
732 | [CGROUP_CLOSED] = "closed", | |
733 | [CGROUP_STRICT] = "strict", | |
734 | }; | |
4fbf50b3 | 735 | |
4ad49000 | 736 | DEFINE_STRING_TABLE_LOOKUP(cgroup_device_policy, CGroupDevicePolicy); |