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Commit | Line | Data |
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8e274523 LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4ad49000 | 4 | Copyright 2013 Lennart Poettering |
8e274523 LP |
5 | |
6 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
7 | under the terms of the GNU Lesser General Public License as published by |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
8e274523 LP |
9 | (at your option) any later version. |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 14 | Lesser General Public License for more details. |
8e274523 | 15 | |
5430f7f2 | 16 | You should have received a copy of the GNU Lesser General Public License |
8e274523 LP |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
18 | ***/ | |
19 | ||
c6c18be3 | 20 | #include <fcntl.h> |
e41969e3 | 21 | #include <fnmatch.h> |
8c6db833 | 22 | |
b5efdb8a | 23 | #include "alloc-util.h" |
03a7b521 | 24 | #include "cgroup-util.h" |
3ffd4af2 LP |
25 | #include "cgroup.h" |
26 | #include "fd-util.h" | |
0d39fa9c | 27 | #include "fileio.h" |
77601719 | 28 | #include "fs-util.h" |
6bedfcbb | 29 | #include "parse-util.h" |
9eb977db | 30 | #include "path-util.h" |
03a7b521 | 31 | #include "process-util.h" |
9444b1f2 | 32 | #include "special.h" |
8b43440b | 33 | #include "string-table.h" |
07630cea | 34 | #include "string-util.h" |
8e274523 | 35 | |
9a054909 LP |
36 | #define CGROUP_CPU_QUOTA_PERIOD_USEC ((usec_t) 100 * USEC_PER_MSEC) |
37 | ||
4ad49000 LP |
38 | void cgroup_context_init(CGroupContext *c) { |
39 | assert(c); | |
40 | ||
41 | /* Initialize everything to the kernel defaults, assuming the | |
42 | * structure is preinitialized to 0 */ | |
43 | ||
d53d9474 LP |
44 | c->cpu_shares = CGROUP_CPU_SHARES_INVALID; |
45 | c->startup_cpu_shares = CGROUP_CPU_SHARES_INVALID; | |
46 | c->cpu_quota_per_sec_usec = USEC_INFINITY; | |
47 | ||
ddca82ac | 48 | c->memory_limit = (uint64_t) -1; |
b2f8b02e | 49 | |
d53d9474 LP |
50 | c->blockio_weight = CGROUP_BLKIO_WEIGHT_INVALID; |
51 | c->startup_blockio_weight = CGROUP_BLKIO_WEIGHT_INVALID; | |
52 | ||
53 | c->tasks_max = (uint64_t) -1; | |
32ee7d33 DM |
54 | |
55 | c->netclass_type = CGROUP_NETCLASS_TYPE_NONE; | |
4ad49000 | 56 | } |
8e274523 | 57 | |
4ad49000 LP |
58 | void cgroup_context_free_device_allow(CGroupContext *c, CGroupDeviceAllow *a) { |
59 | assert(c); | |
60 | assert(a); | |
61 | ||
71fda00f | 62 | LIST_REMOVE(device_allow, c->device_allow, a); |
4ad49000 LP |
63 | free(a->path); |
64 | free(a); | |
65 | } | |
66 | ||
67 | void cgroup_context_free_blockio_device_weight(CGroupContext *c, CGroupBlockIODeviceWeight *w) { | |
68 | assert(c); | |
69 | assert(w); | |
70 | ||
71fda00f | 71 | LIST_REMOVE(device_weights, c->blockio_device_weights, w); |
4ad49000 LP |
72 | free(w->path); |
73 | free(w); | |
74 | } | |
75 | ||
76 | void cgroup_context_free_blockio_device_bandwidth(CGroupContext *c, CGroupBlockIODeviceBandwidth *b) { | |
77 | assert(c); | |
8e274523 | 78 | assert(b); |
8e274523 | 79 | |
71fda00f | 80 | LIST_REMOVE(device_bandwidths, c->blockio_device_bandwidths, b); |
4ad49000 LP |
81 | free(b->path); |
82 | free(b); | |
83 | } | |
84 | ||
85 | void cgroup_context_done(CGroupContext *c) { | |
86 | assert(c); | |
87 | ||
88 | while (c->blockio_device_weights) | |
89 | cgroup_context_free_blockio_device_weight(c, c->blockio_device_weights); | |
90 | ||
91 | while (c->blockio_device_bandwidths) | |
92 | cgroup_context_free_blockio_device_bandwidth(c, c->blockio_device_bandwidths); | |
93 | ||
94 | while (c->device_allow) | |
95 | cgroup_context_free_device_allow(c, c->device_allow); | |
96 | } | |
97 | ||
98 | void cgroup_context_dump(CGroupContext *c, FILE* f, const char *prefix) { | |
99 | CGroupBlockIODeviceBandwidth *b; | |
100 | CGroupBlockIODeviceWeight *w; | |
101 | CGroupDeviceAllow *a; | |
9a054909 | 102 | char u[FORMAT_TIMESPAN_MAX]; |
4ad49000 LP |
103 | |
104 | assert(c); | |
105 | assert(f); | |
106 | ||
107 | prefix = strempty(prefix); | |
108 | ||
109 | fprintf(f, | |
110 | "%sCPUAccounting=%s\n" | |
111 | "%sBlockIOAccounting=%s\n" | |
112 | "%sMemoryAccounting=%s\n" | |
d53d9474 LP |
113 | "%sTasksAccounting=%s\n" |
114 | "%sCPUShares=%" PRIu64 "\n" | |
115 | "%sStartupCPUShares=%" PRIu64 "\n" | |
b2f8b02e | 116 | "%sCPUQuotaPerSecSec=%s\n" |
d53d9474 LP |
117 | "%sBlockIOWeight=%" PRIu64 "\n" |
118 | "%sStartupBlockIOWeight=%" PRIu64 "\n" | |
4ad49000 | 119 | "%sMemoryLimit=%" PRIu64 "\n" |
03a7b521 | 120 | "%sTasksMax=%" PRIu64 "\n" |
a931ad47 LP |
121 | "%sDevicePolicy=%s\n" |
122 | "%sDelegate=%s\n", | |
4ad49000 LP |
123 | prefix, yes_no(c->cpu_accounting), |
124 | prefix, yes_no(c->blockio_accounting), | |
125 | prefix, yes_no(c->memory_accounting), | |
d53d9474 | 126 | prefix, yes_no(c->tasks_accounting), |
4ad49000 | 127 | prefix, c->cpu_shares, |
95ae05c0 | 128 | prefix, c->startup_cpu_shares, |
b1d6dcf5 | 129 | prefix, format_timespan(u, sizeof(u), c->cpu_quota_per_sec_usec, 1), |
4ad49000 | 130 | prefix, c->blockio_weight, |
95ae05c0 | 131 | prefix, c->startup_blockio_weight, |
4ad49000 | 132 | prefix, c->memory_limit, |
03a7b521 | 133 | prefix, c->tasks_max, |
a931ad47 LP |
134 | prefix, cgroup_device_policy_to_string(c->device_policy), |
135 | prefix, yes_no(c->delegate)); | |
4ad49000 LP |
136 | |
137 | LIST_FOREACH(device_allow, a, c->device_allow) | |
138 | fprintf(f, | |
139 | "%sDeviceAllow=%s %s%s%s\n", | |
140 | prefix, | |
141 | a->path, | |
142 | a->r ? "r" : "", a->w ? "w" : "", a->m ? "m" : ""); | |
143 | ||
144 | LIST_FOREACH(device_weights, w, c->blockio_device_weights) | |
145 | fprintf(f, | |
d53d9474 | 146 | "%sBlockIODeviceWeight=%s %" PRIu64, |
4ad49000 LP |
147 | prefix, |
148 | w->path, | |
149 | w->weight); | |
150 | ||
151 | LIST_FOREACH(device_bandwidths, b, c->blockio_device_bandwidths) { | |
152 | char buf[FORMAT_BYTES_MAX]; | |
153 | ||
154 | fprintf(f, | |
155 | "%s%s=%s %s\n", | |
156 | prefix, | |
157 | b->read ? "BlockIOReadBandwidth" : "BlockIOWriteBandwidth", | |
158 | b->path, | |
159 | format_bytes(buf, sizeof(buf), b->bandwidth)); | |
160 | } | |
161 | } | |
162 | ||
163 | static int lookup_blkio_device(const char *p, dev_t *dev) { | |
164 | struct stat st; | |
165 | int r; | |
166 | ||
167 | assert(p); | |
168 | assert(dev); | |
169 | ||
170 | r = stat(p, &st); | |
4a62c710 MS |
171 | if (r < 0) |
172 | return log_warning_errno(errno, "Couldn't stat device %s: %m", p); | |
8e274523 | 173 | |
4ad49000 LP |
174 | if (S_ISBLK(st.st_mode)) |
175 | *dev = st.st_rdev; | |
176 | else if (major(st.st_dev) != 0) { | |
177 | /* If this is not a device node then find the block | |
178 | * device this file is stored on */ | |
179 | *dev = st.st_dev; | |
180 | ||
181 | /* If this is a partition, try to get the originating | |
182 | * block device */ | |
183 | block_get_whole_disk(*dev, dev); | |
184 | } else { | |
185 | log_warning("%s is not a block device and file system block device cannot be determined or is not local.", p); | |
186 | return -ENODEV; | |
187 | } | |
8e274523 | 188 | |
8e274523 | 189 | return 0; |
8e274523 LP |
190 | } |
191 | ||
4ad49000 LP |
192 | static int whitelist_device(const char *path, const char *node, const char *acc) { |
193 | char buf[2+DECIMAL_STR_MAX(dev_t)*2+2+4]; | |
194 | struct stat st; | |
8c6db833 | 195 | int r; |
8e274523 | 196 | |
4ad49000 LP |
197 | assert(path); |
198 | assert(acc); | |
8e274523 | 199 | |
4ad49000 LP |
200 | if (stat(node, &st) < 0) { |
201 | log_warning("Couldn't stat device %s", node); | |
202 | return -errno; | |
203 | } | |
204 | ||
205 | if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) { | |
206 | log_warning("%s is not a device.", node); | |
207 | return -ENODEV; | |
208 | } | |
209 | ||
210 | sprintf(buf, | |
211 | "%c %u:%u %s", | |
212 | S_ISCHR(st.st_mode) ? 'c' : 'b', | |
213 | major(st.st_rdev), minor(st.st_rdev), | |
214 | acc); | |
215 | ||
216 | r = cg_set_attribute("devices", path, "devices.allow", buf); | |
1aeab12b | 217 | if (r < 0) |
077ba06e | 218 | log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, |
714e2e1d | 219 | "Failed to set devices.allow on %s: %m", path); |
4ad49000 LP |
220 | |
221 | return r; | |
8e274523 LP |
222 | } |
223 | ||
90060676 LP |
224 | static int whitelist_major(const char *path, const char *name, char type, const char *acc) { |
225 | _cleanup_fclose_ FILE *f = NULL; | |
226 | char line[LINE_MAX]; | |
227 | bool good = false; | |
228 | int r; | |
229 | ||
230 | assert(path); | |
231 | assert(acc); | |
232 | assert(type == 'b' || type == 'c'); | |
233 | ||
234 | f = fopen("/proc/devices", "re"); | |
4a62c710 MS |
235 | if (!f) |
236 | return log_warning_errno(errno, "Cannot open /proc/devices to resolve %s (%c): %m", name, type); | |
90060676 LP |
237 | |
238 | FOREACH_LINE(line, f, goto fail) { | |
239 | char buf[2+DECIMAL_STR_MAX(unsigned)+3+4], *p, *w; | |
240 | unsigned maj; | |
241 | ||
242 | truncate_nl(line); | |
243 | ||
244 | if (type == 'c' && streq(line, "Character devices:")) { | |
245 | good = true; | |
246 | continue; | |
247 | } | |
248 | ||
249 | if (type == 'b' && streq(line, "Block devices:")) { | |
250 | good = true; | |
251 | continue; | |
252 | } | |
253 | ||
254 | if (isempty(line)) { | |
255 | good = false; | |
256 | continue; | |
257 | } | |
258 | ||
259 | if (!good) | |
260 | continue; | |
261 | ||
262 | p = strstrip(line); | |
263 | ||
264 | w = strpbrk(p, WHITESPACE); | |
265 | if (!w) | |
266 | continue; | |
267 | *w = 0; | |
268 | ||
269 | r = safe_atou(p, &maj); | |
270 | if (r < 0) | |
271 | continue; | |
272 | if (maj <= 0) | |
273 | continue; | |
274 | ||
275 | w++; | |
276 | w += strspn(w, WHITESPACE); | |
e41969e3 LP |
277 | |
278 | if (fnmatch(name, w, 0) != 0) | |
90060676 LP |
279 | continue; |
280 | ||
281 | sprintf(buf, | |
282 | "%c %u:* %s", | |
283 | type, | |
284 | maj, | |
285 | acc); | |
286 | ||
287 | r = cg_set_attribute("devices", path, "devices.allow", buf); | |
1aeab12b | 288 | if (r < 0) |
077ba06e | 289 | log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, |
714e2e1d | 290 | "Failed to set devices.allow on %s: %m", path); |
90060676 LP |
291 | } |
292 | ||
293 | return 0; | |
294 | ||
295 | fail: | |
56f64d95 | 296 | log_warning_errno(errno, "Failed to read /proc/devices: %m"); |
90060676 LP |
297 | return -errno; |
298 | } | |
299 | ||
32ee7d33 | 300 | void cgroup_context_apply(CGroupContext *c, CGroupMask mask, const char *path, uint32_t netclass, ManagerState state) { |
01efdf13 | 301 | bool is_root; |
4ad49000 LP |
302 | int r; |
303 | ||
304 | assert(c); | |
305 | assert(path); | |
8e274523 | 306 | |
4ad49000 LP |
307 | if (mask == 0) |
308 | return; | |
8e274523 | 309 | |
71c26873 | 310 | /* Some cgroup attributes are not supported on the root cgroup, |
01efdf13 LP |
311 | * hence silently ignore */ |
312 | is_root = isempty(path) || path_equal(path, "/"); | |
6da13913 ZJS |
313 | if (is_root) |
314 | /* Make sure we don't try to display messages with an empty path. */ | |
315 | path = "/"; | |
01efdf13 | 316 | |
714e2e1d LP |
317 | /* We generally ignore errors caused by read-only mounted |
318 | * cgroup trees (assuming we are running in a container then), | |
319 | * and missing cgroups, i.e. EROFS and ENOENT. */ | |
320 | ||
efdb0237 | 321 | if ((mask & CGROUP_MASK_CPU) && !is_root) { |
d53d9474 | 322 | char buf[MAX(DECIMAL_STR_MAX(uint64_t), DECIMAL_STR_MAX(usec_t)) + 1]; |
8e274523 | 323 | |
d53d9474 LP |
324 | sprintf(buf, "%" PRIu64 "\n", |
325 | IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) && c->startup_cpu_shares != CGROUP_CPU_SHARES_INVALID ? c->startup_cpu_shares : | |
326 | c->cpu_shares != CGROUP_CPU_SHARES_INVALID ? c->cpu_shares : CGROUP_CPU_SHARES_DEFAULT); | |
4ad49000 | 327 | r = cg_set_attribute("cpu", path, "cpu.shares", buf); |
1aeab12b | 328 | if (r < 0) |
077ba06e | 329 | log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, |
714e2e1d | 330 | "Failed to set cpu.shares on %s: %m", path); |
b2f8b02e | 331 | |
9a054909 | 332 | sprintf(buf, USEC_FMT "\n", CGROUP_CPU_QUOTA_PERIOD_USEC); |
b2f8b02e | 333 | r = cg_set_attribute("cpu", path, "cpu.cfs_period_us", buf); |
1aeab12b | 334 | if (r < 0) |
077ba06e | 335 | log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, |
714e2e1d | 336 | "Failed to set cpu.cfs_period_us on %s: %m", path); |
b2f8b02e | 337 | |
3a43da28 | 338 | if (c->cpu_quota_per_sec_usec != USEC_INFINITY) { |
9a054909 | 339 | sprintf(buf, USEC_FMT "\n", c->cpu_quota_per_sec_usec * CGROUP_CPU_QUOTA_PERIOD_USEC / USEC_PER_SEC); |
b2f8b02e LP |
340 | r = cg_set_attribute("cpu", path, "cpu.cfs_quota_us", buf); |
341 | } else | |
342 | r = cg_set_attribute("cpu", path, "cpu.cfs_quota_us", "-1"); | |
1aeab12b | 343 | if (r < 0) |
077ba06e | 344 | log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, |
714e2e1d | 345 | "Failed to set cpu.cfs_quota_us on %s: %m", path); |
4ad49000 LP |
346 | } |
347 | ||
efdb0237 | 348 | if (mask & CGROUP_MASK_BLKIO) { |
d53d9474 LP |
349 | char buf[MAX(DECIMAL_STR_MAX(uint64_t)+1, |
350 | DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1)]; | |
4ad49000 LP |
351 | CGroupBlockIODeviceWeight *w; |
352 | CGroupBlockIODeviceBandwidth *b; | |
353 | ||
01efdf13 | 354 | if (!is_root) { |
d53d9474 LP |
355 | sprintf(buf, "%" PRIu64 "\n", |
356 | IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) && c->startup_blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID ? c->startup_blockio_weight : | |
357 | c->blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID ? c->blockio_weight : CGROUP_BLKIO_WEIGHT_DEFAULT); | |
01efdf13 | 358 | r = cg_set_attribute("blkio", path, "blkio.weight", buf); |
1aeab12b | 359 | if (r < 0) |
077ba06e | 360 | log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, |
714e2e1d | 361 | "Failed to set blkio.weight on %s: %m", path); |
4ad49000 | 362 | |
01efdf13 LP |
363 | /* FIXME: no way to reset this list */ |
364 | LIST_FOREACH(device_weights, w, c->blockio_device_weights) { | |
365 | dev_t dev; | |
4ad49000 | 366 | |
01efdf13 LP |
367 | r = lookup_blkio_device(w->path, &dev); |
368 | if (r < 0) | |
369 | continue; | |
8e274523 | 370 | |
d53d9474 | 371 | sprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), w->weight); |
01efdf13 | 372 | r = cg_set_attribute("blkio", path, "blkio.weight_device", buf); |
1aeab12b | 373 | if (r < 0) |
077ba06e | 374 | log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, |
714e2e1d | 375 | "Failed to set blkio.weight_device on %s: %m", path); |
01efdf13 | 376 | } |
4ad49000 LP |
377 | } |
378 | ||
379 | /* FIXME: no way to reset this list */ | |
380 | LIST_FOREACH(device_bandwidths, b, c->blockio_device_bandwidths) { | |
381 | const char *a; | |
382 | dev_t dev; | |
383 | ||
384 | r = lookup_blkio_device(b->path, &dev); | |
385 | if (r < 0) | |
386 | continue; | |
387 | ||
388 | a = b->read ? "blkio.throttle.read_bps_device" : "blkio.throttle.write_bps_device"; | |
389 | ||
390 | sprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), b->bandwidth); | |
391 | r = cg_set_attribute("blkio", path, a, buf); | |
1aeab12b | 392 | if (r < 0) |
077ba06e | 393 | log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, |
714e2e1d | 394 | "Failed to set %s on %s: %m", a, path); |
d686d8a9 | 395 | } |
8e274523 LP |
396 | } |
397 | ||
efdb0237 | 398 | if ((mask & CGROUP_MASK_MEMORY) && !is_root) { |
6a94f2e9 | 399 | if (c->memory_limit != (uint64_t) -1) { |
e58cec11 LP |
400 | char buf[DECIMAL_STR_MAX(uint64_t) + 1]; |
401 | ||
6a94f2e9 | 402 | sprintf(buf, "%" PRIu64 "\n", c->memory_limit); |
efdb0237 LP |
403 | |
404 | if (cg_unified() <= 0) | |
405 | r = cg_set_attribute("memory", path, "memory.limit_in_bytes", buf); | |
406 | else | |
407 | r = cg_set_attribute("memory", path, "memory.max", buf); | |
408 | ||
409 | } else { | |
410 | if (cg_unified() <= 0) | |
411 | r = cg_set_attribute("memory", path, "memory.limit_in_bytes", "-1"); | |
412 | else | |
413 | r = cg_set_attribute("memory", path, "memory.max", "max"); | |
414 | } | |
8e274523 | 415 | |
1aeab12b | 416 | if (r < 0) |
077ba06e | 417 | log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, |
efdb0237 | 418 | "Failed to set memory.limit_in_bytes/memory.max on %s: %m", path); |
4ad49000 | 419 | } |
8e274523 | 420 | |
3905f127 | 421 | if ((mask & CGROUP_MASK_DEVICES) && !is_root) { |
4ad49000 | 422 | CGroupDeviceAllow *a; |
8e274523 | 423 | |
714e2e1d LP |
424 | /* Changing the devices list of a populated cgroup |
425 | * might result in EINVAL, hence ignore EINVAL | |
426 | * here. */ | |
427 | ||
4ad49000 LP |
428 | if (c->device_allow || c->device_policy != CGROUP_AUTO) |
429 | r = cg_set_attribute("devices", path, "devices.deny", "a"); | |
430 | else | |
431 | r = cg_set_attribute("devices", path, "devices.allow", "a"); | |
1aeab12b | 432 | if (r < 0) |
077ba06e | 433 | log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, |
714e2e1d | 434 | "Failed to reset devices.list on %s: %m", path); |
fb385181 | 435 | |
4ad49000 LP |
436 | if (c->device_policy == CGROUP_CLOSED || |
437 | (c->device_policy == CGROUP_AUTO && c->device_allow)) { | |
438 | static const char auto_devices[] = | |
7d711efb LP |
439 | "/dev/null\0" "rwm\0" |
440 | "/dev/zero\0" "rwm\0" | |
441 | "/dev/full\0" "rwm\0" | |
442 | "/dev/random\0" "rwm\0" | |
443 | "/dev/urandom\0" "rwm\0" | |
444 | "/dev/tty\0" "rwm\0" | |
445 | "/dev/pts/ptmx\0" "rw\0"; /* /dev/pts/ptmx may not be duplicated, but accessed */ | |
4ad49000 LP |
446 | |
447 | const char *x, *y; | |
448 | ||
449 | NULSTR_FOREACH_PAIR(x, y, auto_devices) | |
450 | whitelist_device(path, x, y); | |
7d711efb LP |
451 | |
452 | whitelist_major(path, "pts", 'c', "rw"); | |
453 | whitelist_major(path, "kdbus", 'c', "rw"); | |
454 | whitelist_major(path, "kdbus/*", 'c', "rw"); | |
4ad49000 LP |
455 | } |
456 | ||
457 | LIST_FOREACH(device_allow, a, c->device_allow) { | |
458 | char acc[4]; | |
459 | unsigned k = 0; | |
460 | ||
461 | if (a->r) | |
462 | acc[k++] = 'r'; | |
463 | if (a->w) | |
464 | acc[k++] = 'w'; | |
465 | if (a->m) | |
466 | acc[k++] = 'm'; | |
fb385181 | 467 | |
4ad49000 LP |
468 | if (k == 0) |
469 | continue; | |
fb385181 | 470 | |
4ad49000 | 471 | acc[k++] = 0; |
90060676 LP |
472 | |
473 | if (startswith(a->path, "/dev/")) | |
474 | whitelist_device(path, a->path, acc); | |
475 | else if (startswith(a->path, "block-")) | |
476 | whitelist_major(path, a->path + 6, 'b', acc); | |
477 | else if (startswith(a->path, "char-")) | |
478 | whitelist_major(path, a->path + 5, 'c', acc); | |
479 | else | |
480 | log_debug("Ignoring device %s while writing cgroup attribute.", a->path); | |
4ad49000 LP |
481 | } |
482 | } | |
03a7b521 LP |
483 | |
484 | if ((mask & CGROUP_MASK_PIDS) && !is_root) { | |
485 | ||
486 | if (c->tasks_max != (uint64_t) -1) { | |
487 | char buf[DECIMAL_STR_MAX(uint64_t) + 2]; | |
488 | ||
489 | sprintf(buf, "%" PRIu64 "\n", c->tasks_max); | |
490 | r = cg_set_attribute("pids", path, "pids.max", buf); | |
491 | } else | |
492 | r = cg_set_attribute("pids", path, "pids.max", "max"); | |
493 | ||
494 | if (r < 0) | |
077ba06e | 495 | log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, |
03a7b521 LP |
496 | "Failed to set pids.max on %s: %m", path); |
497 | } | |
32ee7d33 DM |
498 | |
499 | if (mask & CGROUP_MASK_NET_CLS) { | |
500 | char buf[DECIMAL_STR_MAX(uint32_t)]; | |
501 | ||
502 | sprintf(buf, "%" PRIu32, netclass); | |
503 | ||
504 | r = cg_set_attribute("net_cls", path, "net_cls.classid", buf); | |
505 | if (r < 0) | |
077ba06e | 506 | log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, |
32ee7d33 DM |
507 | "Failed to set net_cls.classid on %s: %m", path); |
508 | } | |
fb385181 LP |
509 | } |
510 | ||
efdb0237 LP |
511 | CGroupMask cgroup_context_get_mask(CGroupContext *c) { |
512 | CGroupMask mask = 0; | |
8e274523 | 513 | |
4ad49000 | 514 | /* Figure out which controllers we need */ |
8e274523 | 515 | |
b2f8b02e | 516 | if (c->cpu_accounting || |
d53d9474 LP |
517 | c->cpu_shares != CGROUP_CPU_SHARES_INVALID || |
518 | c->startup_cpu_shares != CGROUP_CPU_SHARES_INVALID || | |
3a43da28 | 519 | c->cpu_quota_per_sec_usec != USEC_INFINITY) |
efdb0237 | 520 | mask |= CGROUP_MASK_CPUACCT | CGROUP_MASK_CPU; |
ecedd90f | 521 | |
4ad49000 | 522 | if (c->blockio_accounting || |
d53d9474 LP |
523 | c->blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID || |
524 | c->startup_blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID || | |
4ad49000 | 525 | c->blockio_device_weights || |
db785129 | 526 | c->blockio_device_bandwidths) |
efdb0237 | 527 | mask |= CGROUP_MASK_BLKIO; |
ecedd90f | 528 | |
4ad49000 | 529 | if (c->memory_accounting || |
ddca82ac | 530 | c->memory_limit != (uint64_t) -1) |
efdb0237 | 531 | mask |= CGROUP_MASK_MEMORY; |
8e274523 | 532 | |
a931ad47 LP |
533 | if (c->device_allow || |
534 | c->device_policy != CGROUP_AUTO) | |
3905f127 | 535 | mask |= CGROUP_MASK_DEVICES; |
4ad49000 | 536 | |
03a7b521 LP |
537 | if (c->tasks_accounting || |
538 | c->tasks_max != (uint64_t) -1) | |
539 | mask |= CGROUP_MASK_PIDS; | |
540 | ||
32ee7d33 DM |
541 | if (c->netclass_type != CGROUP_NETCLASS_TYPE_NONE) |
542 | mask |= CGROUP_MASK_NET_CLS; | |
543 | ||
4ad49000 | 544 | return mask; |
8e274523 LP |
545 | } |
546 | ||
efdb0237 | 547 | CGroupMask unit_get_own_mask(Unit *u) { |
4ad49000 | 548 | CGroupContext *c; |
8e274523 | 549 | |
efdb0237 LP |
550 | /* Returns the mask of controllers the unit needs for itself */ |
551 | ||
4ad49000 LP |
552 | c = unit_get_cgroup_context(u); |
553 | if (!c) | |
554 | return 0; | |
8e274523 | 555 | |
a931ad47 | 556 | /* If delegation is turned on, then turn on all cgroups, |
19af675e LP |
557 | * unless we are on the legacy hierarchy and the process we |
558 | * fork into it is known to drop privileges, and hence | |
559 | * shouldn't get access to the controllers. | |
560 | * | |
561 | * Note that on the unified hierarchy it is safe to delegate | |
562 | * controllers to unprivileged services. */ | |
a931ad47 LP |
563 | |
564 | if (c->delegate) { | |
565 | ExecContext *e; | |
566 | ||
567 | e = unit_get_exec_context(u); | |
19af675e LP |
568 | if (!e || |
569 | exec_context_maintains_privileges(e) || | |
570 | cg_unified() > 0) | |
efdb0237 | 571 | return _CGROUP_MASK_ALL; |
a931ad47 LP |
572 | } |
573 | ||
db785129 | 574 | return cgroup_context_get_mask(c); |
8e274523 LP |
575 | } |
576 | ||
efdb0237 | 577 | CGroupMask unit_get_members_mask(Unit *u) { |
4ad49000 | 578 | assert(u); |
bc432dc7 | 579 | |
efdb0237 LP |
580 | /* Returns the mask of controllers all of the unit's children |
581 | * require, merged */ | |
582 | ||
bc432dc7 LP |
583 | if (u->cgroup_members_mask_valid) |
584 | return u->cgroup_members_mask; | |
585 | ||
586 | u->cgroup_members_mask = 0; | |
587 | ||
588 | if (u->type == UNIT_SLICE) { | |
589 | Unit *member; | |
590 | Iterator i; | |
591 | ||
592 | SET_FOREACH(member, u->dependencies[UNIT_BEFORE], i) { | |
593 | ||
594 | if (member == u) | |
595 | continue; | |
596 | ||
d4fdc205 | 597 | if (UNIT_DEREF(member->slice) != u) |
bc432dc7 LP |
598 | continue; |
599 | ||
600 | u->cgroup_members_mask |= | |
efdb0237 | 601 | unit_get_own_mask(member) | |
bc432dc7 LP |
602 | unit_get_members_mask(member); |
603 | } | |
604 | } | |
605 | ||
606 | u->cgroup_members_mask_valid = true; | |
6414b7c9 | 607 | return u->cgroup_members_mask; |
246aa6dd LP |
608 | } |
609 | ||
efdb0237 | 610 | CGroupMask unit_get_siblings_mask(Unit *u) { |
4ad49000 | 611 | assert(u); |
246aa6dd | 612 | |
efdb0237 LP |
613 | /* Returns the mask of controllers all of the unit's siblings |
614 | * require, i.e. the members mask of the unit's parent slice | |
615 | * if there is one. */ | |
616 | ||
bc432dc7 | 617 | if (UNIT_ISSET(u->slice)) |
637f421e | 618 | return unit_get_members_mask(UNIT_DEREF(u->slice)); |
4ad49000 | 619 | |
efdb0237 | 620 | return unit_get_own_mask(u) | unit_get_members_mask(u); |
246aa6dd LP |
621 | } |
622 | ||
efdb0237 LP |
623 | CGroupMask unit_get_subtree_mask(Unit *u) { |
624 | ||
625 | /* Returns the mask of this subtree, meaning of the group | |
626 | * itself and its children. */ | |
627 | ||
628 | return unit_get_own_mask(u) | unit_get_members_mask(u); | |
629 | } | |
630 | ||
631 | CGroupMask unit_get_target_mask(Unit *u) { | |
632 | CGroupMask mask; | |
633 | ||
634 | /* This returns the cgroup mask of all controllers to enable | |
635 | * for a specific cgroup, i.e. everything it needs itself, | |
636 | * plus all that its children need, plus all that its siblings | |
637 | * need. This is primarily useful on the legacy cgroup | |
638 | * hierarchy, where we need to duplicate each cgroup in each | |
639 | * hierarchy that shall be enabled for it. */ | |
6414b7c9 | 640 | |
efdb0237 LP |
641 | mask = unit_get_own_mask(u) | unit_get_members_mask(u) | unit_get_siblings_mask(u); |
642 | mask &= u->manager->cgroup_supported; | |
643 | ||
644 | return mask; | |
645 | } | |
646 | ||
647 | CGroupMask unit_get_enable_mask(Unit *u) { | |
648 | CGroupMask mask; | |
649 | ||
650 | /* This returns the cgroup mask of all controllers to enable | |
651 | * for the children of a specific cgroup. This is primarily | |
652 | * useful for the unified cgroup hierarchy, where each cgroup | |
653 | * controls which controllers are enabled for its children. */ | |
654 | ||
655 | mask = unit_get_members_mask(u); | |
6414b7c9 DS |
656 | mask &= u->manager->cgroup_supported; |
657 | ||
658 | return mask; | |
659 | } | |
660 | ||
661 | /* Recurse from a unit up through its containing slices, propagating | |
662 | * mask bits upward. A unit is also member of itself. */ | |
bc432dc7 | 663 | void unit_update_cgroup_members_masks(Unit *u) { |
efdb0237 | 664 | CGroupMask m; |
bc432dc7 LP |
665 | bool more; |
666 | ||
667 | assert(u); | |
668 | ||
669 | /* Calculate subtree mask */ | |
efdb0237 | 670 | m = unit_get_subtree_mask(u); |
bc432dc7 LP |
671 | |
672 | /* See if anything changed from the previous invocation. If | |
673 | * not, we're done. */ | |
674 | if (u->cgroup_subtree_mask_valid && m == u->cgroup_subtree_mask) | |
675 | return; | |
676 | ||
677 | more = | |
678 | u->cgroup_subtree_mask_valid && | |
679 | ((m & ~u->cgroup_subtree_mask) != 0) && | |
680 | ((~m & u->cgroup_subtree_mask) == 0); | |
681 | ||
682 | u->cgroup_subtree_mask = m; | |
683 | u->cgroup_subtree_mask_valid = true; | |
684 | ||
6414b7c9 DS |
685 | if (UNIT_ISSET(u->slice)) { |
686 | Unit *s = UNIT_DEREF(u->slice); | |
bc432dc7 LP |
687 | |
688 | if (more) | |
689 | /* There's more set now than before. We | |
690 | * propagate the new mask to the parent's mask | |
691 | * (not caring if it actually was valid or | |
692 | * not). */ | |
693 | ||
694 | s->cgroup_members_mask |= m; | |
695 | ||
696 | else | |
697 | /* There's less set now than before (or we | |
698 | * don't know), we need to recalculate | |
699 | * everything, so let's invalidate the | |
700 | * parent's members mask */ | |
701 | ||
702 | s->cgroup_members_mask_valid = false; | |
703 | ||
704 | /* And now make sure that this change also hits our | |
705 | * grandparents */ | |
706 | unit_update_cgroup_members_masks(s); | |
6414b7c9 DS |
707 | } |
708 | } | |
709 | ||
efdb0237 | 710 | static const char *migrate_callback(CGroupMask mask, void *userdata) { |
03b90d4b LP |
711 | Unit *u = userdata; |
712 | ||
713 | assert(mask != 0); | |
714 | assert(u); | |
715 | ||
716 | while (u) { | |
717 | if (u->cgroup_path && | |
718 | u->cgroup_realized && | |
719 | (u->cgroup_realized_mask & mask) == mask) | |
720 | return u->cgroup_path; | |
721 | ||
722 | u = UNIT_DEREF(u->slice); | |
723 | } | |
724 | ||
725 | return NULL; | |
726 | } | |
727 | ||
efdb0237 LP |
728 | char *unit_default_cgroup_path(Unit *u) { |
729 | _cleanup_free_ char *escaped = NULL, *slice = NULL; | |
730 | int r; | |
731 | ||
732 | assert(u); | |
733 | ||
734 | if (unit_has_name(u, SPECIAL_ROOT_SLICE)) | |
735 | return strdup(u->manager->cgroup_root); | |
736 | ||
737 | if (UNIT_ISSET(u->slice) && !unit_has_name(UNIT_DEREF(u->slice), SPECIAL_ROOT_SLICE)) { | |
738 | r = cg_slice_to_path(UNIT_DEREF(u->slice)->id, &slice); | |
739 | if (r < 0) | |
740 | return NULL; | |
741 | } | |
742 | ||
743 | escaped = cg_escape(u->id); | |
744 | if (!escaped) | |
745 | return NULL; | |
746 | ||
747 | if (slice) | |
748 | return strjoin(u->manager->cgroup_root, "/", slice, "/", escaped, NULL); | |
749 | else | |
750 | return strjoin(u->manager->cgroup_root, "/", escaped, NULL); | |
751 | } | |
752 | ||
753 | int unit_set_cgroup_path(Unit *u, const char *path) { | |
754 | _cleanup_free_ char *p = NULL; | |
755 | int r; | |
756 | ||
757 | assert(u); | |
758 | ||
759 | if (path) { | |
760 | p = strdup(path); | |
761 | if (!p) | |
762 | return -ENOMEM; | |
763 | } else | |
764 | p = NULL; | |
765 | ||
766 | if (streq_ptr(u->cgroup_path, p)) | |
767 | return 0; | |
768 | ||
769 | if (p) { | |
770 | r = hashmap_put(u->manager->cgroup_unit, p, u); | |
771 | if (r < 0) | |
772 | return r; | |
773 | } | |
774 | ||
775 | unit_release_cgroup(u); | |
776 | ||
777 | u->cgroup_path = p; | |
778 | p = NULL; | |
779 | ||
780 | return 1; | |
781 | } | |
782 | ||
783 | int unit_watch_cgroup(Unit *u) { | |
784 | _cleanup_free_ char *populated = NULL; | |
785 | int r; | |
786 | ||
787 | assert(u); | |
788 | ||
789 | if (!u->cgroup_path) | |
790 | return 0; | |
791 | ||
792 | if (u->cgroup_inotify_wd >= 0) | |
793 | return 0; | |
794 | ||
795 | /* Only applies to the unified hierarchy */ | |
796 | r = cg_unified(); | |
797 | if (r < 0) | |
798 | return log_unit_error_errno(u, r, "Failed detect wether the unified hierarchy is used: %m"); | |
799 | if (r == 0) | |
800 | return 0; | |
801 | ||
802 | /* Don't watch the root slice, it's pointless. */ | |
803 | if (unit_has_name(u, SPECIAL_ROOT_SLICE)) | |
804 | return 0; | |
805 | ||
806 | r = hashmap_ensure_allocated(&u->manager->cgroup_inotify_wd_unit, &trivial_hash_ops); | |
807 | if (r < 0) | |
808 | return log_oom(); | |
809 | ||
810 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, "cgroup.populated", &populated); | |
811 | if (r < 0) | |
812 | return log_oom(); | |
813 | ||
814 | u->cgroup_inotify_wd = inotify_add_watch(u->manager->cgroup_inotify_fd, populated, IN_MODIFY); | |
815 | if (u->cgroup_inotify_wd < 0) { | |
816 | ||
817 | if (errno == ENOENT) /* If the directory is already | |
818 | * gone we don't need to track | |
819 | * it, so this is not an error */ | |
820 | return 0; | |
821 | ||
822 | return log_unit_error_errno(u, errno, "Failed to add inotify watch descriptor for control group %s: %m", u->cgroup_path); | |
823 | } | |
824 | ||
825 | r = hashmap_put(u->manager->cgroup_inotify_wd_unit, INT_TO_PTR(u->cgroup_inotify_wd), u); | |
826 | if (r < 0) | |
827 | return log_unit_error_errno(u, r, "Failed to add inotify watch descriptor to hash map: %m"); | |
828 | ||
829 | return 0; | |
830 | } | |
831 | ||
832 | static int unit_create_cgroup( | |
833 | Unit *u, | |
834 | CGroupMask target_mask, | |
835 | CGroupMask enable_mask) { | |
836 | ||
0cd385d3 | 837 | CGroupContext *c; |
bc432dc7 | 838 | int r; |
64747e2d | 839 | |
4ad49000 | 840 | assert(u); |
64747e2d | 841 | |
0cd385d3 LP |
842 | c = unit_get_cgroup_context(u); |
843 | if (!c) | |
844 | return 0; | |
845 | ||
7b3fd631 LP |
846 | if (!u->cgroup_path) { |
847 | _cleanup_free_ char *path = NULL; | |
64747e2d | 848 | |
7b3fd631 LP |
849 | path = unit_default_cgroup_path(u); |
850 | if (!path) | |
851 | return log_oom(); | |
852 | ||
efdb0237 LP |
853 | r = unit_set_cgroup_path(u, path); |
854 | if (r == -EEXIST) | |
855 | return log_unit_error_errno(u, r, "Control group %s exists already.", path); | |
856 | if (r < 0) | |
857 | return log_unit_error_errno(u, r, "Failed to set unit's control group path to %s: %m", path); | |
b58b8e11 HH |
858 | } |
859 | ||
03b90d4b | 860 | /* First, create our own group */ |
efdb0237 | 861 | r = cg_create_everywhere(u->manager->cgroup_supported, target_mask, u->cgroup_path); |
23bbb0de | 862 | if (r < 0) |
efdb0237 LP |
863 | return log_unit_error_errno(u, r, "Failed to create cgroup %s: %m", u->cgroup_path); |
864 | ||
865 | /* Start watching it */ | |
866 | (void) unit_watch_cgroup(u); | |
867 | ||
868 | /* Enable all controllers we need */ | |
869 | r = cg_enable_everywhere(u->manager->cgroup_supported, enable_mask, u->cgroup_path); | |
870 | if (r < 0) | |
871 | log_unit_warning_errno(u, r, "Failed to enable controllers on cgroup %s, ignoring: %m", u->cgroup_path); | |
03b90d4b LP |
872 | |
873 | /* Keep track that this is now realized */ | |
4ad49000 | 874 | u->cgroup_realized = true; |
efdb0237 | 875 | u->cgroup_realized_mask = target_mask; |
4ad49000 | 876 | |
0cd385d3 LP |
877 | if (u->type != UNIT_SLICE && !c->delegate) { |
878 | ||
879 | /* Then, possibly move things over, but not if | |
880 | * subgroups may contain processes, which is the case | |
881 | * for slice and delegation units. */ | |
882 | r = cg_migrate_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->cgroup_path, migrate_callback, u); | |
883 | if (r < 0) | |
efdb0237 | 884 | log_unit_warning_errno(u, r, "Failed to migrate cgroup from to %s, ignoring: %m", u->cgroup_path); |
0cd385d3 | 885 | } |
03b90d4b | 886 | |
64747e2d LP |
887 | return 0; |
888 | } | |
889 | ||
7b3fd631 LP |
890 | int unit_attach_pids_to_cgroup(Unit *u) { |
891 | int r; | |
892 | assert(u); | |
893 | ||
894 | r = unit_realize_cgroup(u); | |
895 | if (r < 0) | |
896 | return r; | |
897 | ||
898 | r = cg_attach_many_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->pids, migrate_callback, u); | |
899 | if (r < 0) | |
900 | return r; | |
901 | ||
902 | return 0; | |
903 | } | |
904 | ||
efdb0237 | 905 | static bool unit_has_mask_realized(Unit *u, CGroupMask target_mask) { |
bc432dc7 LP |
906 | assert(u); |
907 | ||
efdb0237 | 908 | return u->cgroup_realized && u->cgroup_realized_mask == target_mask; |
6414b7c9 DS |
909 | } |
910 | ||
32ee7d33 DM |
911 | static int unit_find_free_netclass_cgroup(Unit *u, uint32_t *ret) { |
912 | ||
913 | uint32_t start, i; | |
914 | Manager *m; | |
915 | ||
916 | assert(u); | |
917 | ||
918 | m = u->manager; | |
919 | ||
920 | i = start = m->cgroup_netclass_registry_last; | |
921 | ||
922 | do { | |
923 | i++; | |
924 | ||
925 | if (!hashmap_get(m->cgroup_netclass_registry, UINT_TO_PTR(i))) { | |
926 | m->cgroup_netclass_registry_last = i; | |
927 | *ret = i; | |
928 | return 0; | |
929 | } | |
930 | ||
931 | if (i == UINT32_MAX) | |
932 | i = CGROUP_NETCLASS_FIXED_MAX; | |
933 | ||
934 | } while (i != start); | |
935 | ||
936 | return -ENOBUFS; | |
937 | } | |
938 | ||
939 | int unit_add_to_netclass_cgroup(Unit *u) { | |
940 | ||
941 | CGroupContext *cc; | |
942 | Unit *first; | |
943 | void *key; | |
944 | int r; | |
945 | ||
946 | assert(u); | |
947 | ||
948 | cc = unit_get_cgroup_context(u); | |
949 | if (!cc) | |
950 | return 0; | |
951 | ||
952 | switch (cc->netclass_type) { | |
953 | case CGROUP_NETCLASS_TYPE_NONE: | |
954 | return 0; | |
955 | ||
956 | case CGROUP_NETCLASS_TYPE_FIXED: | |
957 | u->cgroup_netclass_id = cc->netclass_id; | |
958 | break; | |
959 | ||
960 | case CGROUP_NETCLASS_TYPE_AUTO: | |
961 | /* Allocate a new ID in case it was requested and not done yet */ | |
962 | if (u->cgroup_netclass_id == 0) { | |
963 | r = unit_find_free_netclass_cgroup(u, &u->cgroup_netclass_id); | |
964 | if (r < 0) | |
965 | return r; | |
966 | ||
967 | log_debug("Dynamically assigned netclass cgroup id %" PRIu32 " to %s", u->cgroup_netclass_id, u->id); | |
968 | } | |
969 | ||
970 | break; | |
971 | } | |
972 | ||
973 | r = hashmap_ensure_allocated(&u->manager->cgroup_netclass_registry, &trivial_hash_ops); | |
974 | if (r < 0) | |
975 | return r; | |
976 | ||
977 | key = UINT32_TO_PTR(u->cgroup_netclass_id); | |
978 | first = hashmap_get(u->manager->cgroup_netclass_registry, key); | |
979 | ||
980 | if (first) { | |
981 | LIST_PREPEND(cgroup_netclass, first, u); | |
982 | return hashmap_replace(u->manager->cgroup_netclass_registry, key, u); | |
983 | } | |
984 | ||
985 | return hashmap_put(u->manager->cgroup_netclass_registry, key, u); | |
986 | } | |
987 | ||
988 | int unit_remove_from_netclass_cgroup(Unit *u) { | |
989 | ||
990 | Unit *head; | |
991 | void *key; | |
992 | ||
993 | assert(u); | |
994 | ||
995 | key = UINT32_TO_PTR(u->cgroup_netclass_id); | |
996 | ||
997 | LIST_FIND_HEAD(cgroup_netclass, u, head); | |
998 | LIST_REMOVE(cgroup_netclass, head, u); | |
999 | ||
1000 | if (head) | |
1001 | return hashmap_replace(u->manager->cgroup_netclass_registry, key, head); | |
1002 | ||
1003 | hashmap_remove(u->manager->cgroup_netclass_registry, key); | |
1004 | ||
1005 | return 0; | |
1006 | } | |
1007 | ||
6414b7c9 DS |
1008 | /* Check if necessary controllers and attributes for a unit are in place. |
1009 | * | |
1010 | * If so, do nothing. | |
1011 | * If not, create paths, move processes over, and set attributes. | |
1012 | * | |
1013 | * Returns 0 on success and < 0 on failure. */ | |
db785129 | 1014 | static int unit_realize_cgroup_now(Unit *u, ManagerState state) { |
efdb0237 | 1015 | CGroupMask target_mask, enable_mask; |
6414b7c9 | 1016 | int r; |
64747e2d | 1017 | |
4ad49000 | 1018 | assert(u); |
64747e2d | 1019 | |
4ad49000 | 1020 | if (u->in_cgroup_queue) { |
71fda00f | 1021 | LIST_REMOVE(cgroup_queue, u->manager->cgroup_queue, u); |
4ad49000 LP |
1022 | u->in_cgroup_queue = false; |
1023 | } | |
64747e2d | 1024 | |
efdb0237 LP |
1025 | target_mask = unit_get_target_mask(u); |
1026 | if (unit_has_mask_realized(u, target_mask)) | |
0a1eb06d | 1027 | return 0; |
64747e2d | 1028 | |
4ad49000 | 1029 | /* First, realize parents */ |
6414b7c9 | 1030 | if (UNIT_ISSET(u->slice)) { |
db785129 | 1031 | r = unit_realize_cgroup_now(UNIT_DEREF(u->slice), state); |
6414b7c9 DS |
1032 | if (r < 0) |
1033 | return r; | |
1034 | } | |
4ad49000 LP |
1035 | |
1036 | /* And then do the real work */ | |
efdb0237 LP |
1037 | enable_mask = unit_get_enable_mask(u); |
1038 | r = unit_create_cgroup(u, target_mask, enable_mask); | |
6414b7c9 DS |
1039 | if (r < 0) |
1040 | return r; | |
1041 | ||
1042 | /* Finally, apply the necessary attributes. */ | |
32ee7d33 | 1043 | cgroup_context_apply(unit_get_cgroup_context(u), target_mask, u->cgroup_path, u->cgroup_netclass_id, state); |
6414b7c9 DS |
1044 | |
1045 | return 0; | |
64747e2d LP |
1046 | } |
1047 | ||
4ad49000 | 1048 | static void unit_add_to_cgroup_queue(Unit *u) { |
ecedd90f | 1049 | |
4ad49000 LP |
1050 | if (u->in_cgroup_queue) |
1051 | return; | |
8e274523 | 1052 | |
71fda00f | 1053 | LIST_PREPEND(cgroup_queue, u->manager->cgroup_queue, u); |
4ad49000 LP |
1054 | u->in_cgroup_queue = true; |
1055 | } | |
8c6db833 | 1056 | |
4ad49000 | 1057 | unsigned manager_dispatch_cgroup_queue(Manager *m) { |
db785129 | 1058 | ManagerState state; |
4ad49000 | 1059 | unsigned n = 0; |
db785129 | 1060 | Unit *i; |
6414b7c9 | 1061 | int r; |
ecedd90f | 1062 | |
db785129 LP |
1063 | state = manager_state(m); |
1064 | ||
4ad49000 LP |
1065 | while ((i = m->cgroup_queue)) { |
1066 | assert(i->in_cgroup_queue); | |
ecedd90f | 1067 | |
db785129 | 1068 | r = unit_realize_cgroup_now(i, state); |
6414b7c9 | 1069 | if (r < 0) |
efdb0237 | 1070 | log_warning_errno(r, "Failed to realize cgroups for queued unit %s, ignoring: %m", i->id); |
0a1eb06d | 1071 | |
4ad49000 LP |
1072 | n++; |
1073 | } | |
ecedd90f | 1074 | |
4ad49000 | 1075 | return n; |
8e274523 LP |
1076 | } |
1077 | ||
4ad49000 LP |
1078 | static void unit_queue_siblings(Unit *u) { |
1079 | Unit *slice; | |
ca949c9d | 1080 | |
4ad49000 LP |
1081 | /* This adds the siblings of the specified unit and the |
1082 | * siblings of all parent units to the cgroup queue. (But | |
1083 | * neither the specified unit itself nor the parents.) */ | |
1084 | ||
1085 | while ((slice = UNIT_DEREF(u->slice))) { | |
1086 | Iterator i; | |
1087 | Unit *m; | |
8f53a7b8 | 1088 | |
4ad49000 LP |
1089 | SET_FOREACH(m, slice->dependencies[UNIT_BEFORE], i) { |
1090 | if (m == u) | |
1091 | continue; | |
8e274523 | 1092 | |
6414b7c9 DS |
1093 | /* Skip units that have a dependency on the slice |
1094 | * but aren't actually in it. */ | |
4ad49000 | 1095 | if (UNIT_DEREF(m->slice) != slice) |
50159e6a | 1096 | continue; |
8e274523 | 1097 | |
6414b7c9 DS |
1098 | /* No point in doing cgroup application for units |
1099 | * without active processes. */ | |
1100 | if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(m))) | |
1101 | continue; | |
1102 | ||
1103 | /* If the unit doesn't need any new controllers | |
1104 | * and has current ones realized, it doesn't need | |
1105 | * any changes. */ | |
1106 | if (unit_has_mask_realized(m, unit_get_target_mask(m))) | |
1107 | continue; | |
1108 | ||
4ad49000 | 1109 | unit_add_to_cgroup_queue(m); |
50159e6a LP |
1110 | } |
1111 | ||
4ad49000 | 1112 | u = slice; |
8e274523 | 1113 | } |
4ad49000 LP |
1114 | } |
1115 | ||
0a1eb06d | 1116 | int unit_realize_cgroup(Unit *u) { |
4ad49000 LP |
1117 | assert(u); |
1118 | ||
35b7ff80 | 1119 | if (!UNIT_HAS_CGROUP_CONTEXT(u)) |
0a1eb06d | 1120 | return 0; |
8e274523 | 1121 | |
4ad49000 LP |
1122 | /* So, here's the deal: when realizing the cgroups for this |
1123 | * unit, we need to first create all parents, but there's more | |
1124 | * actually: for the weight-based controllers we also need to | |
1125 | * make sure that all our siblings (i.e. units that are in the | |
73e231ab | 1126 | * same slice as we are) have cgroups, too. Otherwise, things |
4ad49000 LP |
1127 | * would become very uneven as each of their processes would |
1128 | * get as much resources as all our group together. This call | |
1129 | * will synchronously create the parent cgroups, but will | |
1130 | * defer work on the siblings to the next event loop | |
1131 | * iteration. */ | |
ca949c9d | 1132 | |
4ad49000 LP |
1133 | /* Add all sibling slices to the cgroup queue. */ |
1134 | unit_queue_siblings(u); | |
1135 | ||
6414b7c9 | 1136 | /* And realize this one now (and apply the values) */ |
db785129 | 1137 | return unit_realize_cgroup_now(u, manager_state(u->manager)); |
8e274523 LP |
1138 | } |
1139 | ||
efdb0237 LP |
1140 | void unit_release_cgroup(Unit *u) { |
1141 | assert(u); | |
1142 | ||
1143 | /* Forgets all cgroup details for this cgroup */ | |
1144 | ||
1145 | if (u->cgroup_path) { | |
1146 | (void) hashmap_remove(u->manager->cgroup_unit, u->cgroup_path); | |
1147 | u->cgroup_path = mfree(u->cgroup_path); | |
1148 | } | |
1149 | ||
1150 | if (u->cgroup_inotify_wd >= 0) { | |
1151 | if (inotify_rm_watch(u->manager->cgroup_inotify_fd, u->cgroup_inotify_wd) < 0) | |
1152 | log_unit_debug_errno(u, errno, "Failed to remove cgroup inotify watch %i for %s, ignoring", u->cgroup_inotify_wd, u->id); | |
1153 | ||
1154 | (void) hashmap_remove(u->manager->cgroup_inotify_wd_unit, INT_TO_PTR(u->cgroup_inotify_wd)); | |
1155 | u->cgroup_inotify_wd = -1; | |
1156 | } | |
1157 | } | |
1158 | ||
1159 | void unit_prune_cgroup(Unit *u) { | |
8e274523 | 1160 | int r; |
efdb0237 | 1161 | bool is_root_slice; |
8e274523 | 1162 | |
4ad49000 | 1163 | assert(u); |
8e274523 | 1164 | |
efdb0237 LP |
1165 | /* Removes the cgroup, if empty and possible, and stops watching it. */ |
1166 | ||
4ad49000 LP |
1167 | if (!u->cgroup_path) |
1168 | return; | |
8e274523 | 1169 | |
efdb0237 LP |
1170 | is_root_slice = unit_has_name(u, SPECIAL_ROOT_SLICE); |
1171 | ||
1172 | r = cg_trim_everywhere(u->manager->cgroup_supported, u->cgroup_path, !is_root_slice); | |
dab5bf85 | 1173 | if (r < 0) { |
efdb0237 | 1174 | log_debug_errno(r, "Failed to destroy cgroup %s, ignoring: %m", u->cgroup_path); |
dab5bf85 RL |
1175 | return; |
1176 | } | |
8e274523 | 1177 | |
efdb0237 LP |
1178 | if (is_root_slice) |
1179 | return; | |
1180 | ||
1181 | unit_release_cgroup(u); | |
0a1eb06d | 1182 | |
4ad49000 | 1183 | u->cgroup_realized = false; |
bc432dc7 | 1184 | u->cgroup_realized_mask = 0; |
8e274523 LP |
1185 | } |
1186 | ||
efdb0237 | 1187 | int unit_search_main_pid(Unit *u, pid_t *ret) { |
4ad49000 LP |
1188 | _cleanup_fclose_ FILE *f = NULL; |
1189 | pid_t pid = 0, npid, mypid; | |
efdb0237 | 1190 | int r; |
4ad49000 LP |
1191 | |
1192 | assert(u); | |
efdb0237 | 1193 | assert(ret); |
4ad49000 LP |
1194 | |
1195 | if (!u->cgroup_path) | |
efdb0237 | 1196 | return -ENXIO; |
4ad49000 | 1197 | |
efdb0237 LP |
1198 | r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &f); |
1199 | if (r < 0) | |
1200 | return r; | |
4ad49000 LP |
1201 | |
1202 | mypid = getpid(); | |
1203 | while (cg_read_pid(f, &npid) > 0) { | |
1204 | pid_t ppid; | |
1205 | ||
1206 | if (npid == pid) | |
1207 | continue; | |
8e274523 | 1208 | |
4ad49000 | 1209 | /* Ignore processes that aren't our kids */ |
6bc73acb | 1210 | if (get_process_ppid(npid, &ppid) >= 0 && ppid != mypid) |
4ad49000 | 1211 | continue; |
8e274523 | 1212 | |
efdb0237 | 1213 | if (pid != 0) |
4ad49000 LP |
1214 | /* Dang, there's more than one daemonized PID |
1215 | in this group, so we don't know what process | |
1216 | is the main process. */ | |
efdb0237 LP |
1217 | |
1218 | return -ENODATA; | |
8e274523 | 1219 | |
4ad49000 | 1220 | pid = npid; |
8e274523 LP |
1221 | } |
1222 | ||
efdb0237 LP |
1223 | *ret = pid; |
1224 | return 0; | |
1225 | } | |
1226 | ||
1227 | static int unit_watch_pids_in_path(Unit *u, const char *path) { | |
b3c5bad3 | 1228 | _cleanup_closedir_ DIR *d = NULL; |
efdb0237 LP |
1229 | _cleanup_fclose_ FILE *f = NULL; |
1230 | int ret = 0, r; | |
1231 | ||
1232 | assert(u); | |
1233 | assert(path); | |
1234 | ||
1235 | r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, path, &f); | |
1236 | if (r < 0) | |
1237 | ret = r; | |
1238 | else { | |
1239 | pid_t pid; | |
1240 | ||
1241 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
1242 | r = unit_watch_pid(u, pid); | |
1243 | if (r < 0 && ret >= 0) | |
1244 | ret = r; | |
1245 | } | |
1246 | ||
1247 | if (r < 0 && ret >= 0) | |
1248 | ret = r; | |
1249 | } | |
1250 | ||
1251 | r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, path, &d); | |
1252 | if (r < 0) { | |
1253 | if (ret >= 0) | |
1254 | ret = r; | |
1255 | } else { | |
1256 | char *fn; | |
1257 | ||
1258 | while ((r = cg_read_subgroup(d, &fn)) > 0) { | |
1259 | _cleanup_free_ char *p = NULL; | |
1260 | ||
1261 | p = strjoin(path, "/", fn, NULL); | |
1262 | free(fn); | |
1263 | ||
1264 | if (!p) | |
1265 | return -ENOMEM; | |
1266 | ||
1267 | r = unit_watch_pids_in_path(u, p); | |
1268 | if (r < 0 && ret >= 0) | |
1269 | ret = r; | |
1270 | } | |
1271 | ||
1272 | if (r < 0 && ret >= 0) | |
1273 | ret = r; | |
1274 | } | |
1275 | ||
1276 | return ret; | |
1277 | } | |
1278 | ||
1279 | int unit_watch_all_pids(Unit *u) { | |
1280 | assert(u); | |
1281 | ||
1282 | /* Adds all PIDs from our cgroup to the set of PIDs we | |
1283 | * watch. This is a fallback logic for cases where we do not | |
1284 | * get reliable cgroup empty notifications: we try to use | |
1285 | * SIGCHLD as replacement. */ | |
1286 | ||
1287 | if (!u->cgroup_path) | |
1288 | return -ENOENT; | |
1289 | ||
1290 | if (cg_unified() > 0) /* On unified we can use proper notifications */ | |
1291 | return 0; | |
1292 | ||
1293 | return unit_watch_pids_in_path(u, u->cgroup_path); | |
1294 | } | |
1295 | ||
1296 | int unit_notify_cgroup_empty(Unit *u) { | |
1297 | int r; | |
1298 | ||
1299 | assert(u); | |
1300 | ||
1301 | if (!u->cgroup_path) | |
1302 | return 0; | |
1303 | ||
1304 | r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path); | |
1305 | if (r <= 0) | |
1306 | return r; | |
1307 | ||
1308 | unit_add_to_gc_queue(u); | |
1309 | ||
1310 | if (UNIT_VTABLE(u)->notify_cgroup_empty) | |
1311 | UNIT_VTABLE(u)->notify_cgroup_empty(u); | |
1312 | ||
1313 | return 0; | |
1314 | } | |
1315 | ||
1316 | static int on_cgroup_inotify_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
1317 | Manager *m = userdata; | |
1318 | ||
1319 | assert(s); | |
1320 | assert(fd >= 0); | |
1321 | assert(m); | |
1322 | ||
1323 | for (;;) { | |
1324 | union inotify_event_buffer buffer; | |
1325 | struct inotify_event *e; | |
1326 | ssize_t l; | |
1327 | ||
1328 | l = read(fd, &buffer, sizeof(buffer)); | |
1329 | if (l < 0) { | |
1330 | if (errno == EINTR || errno == EAGAIN) | |
1331 | return 0; | |
1332 | ||
1333 | return log_error_errno(errno, "Failed to read control group inotify events: %m"); | |
1334 | } | |
1335 | ||
1336 | FOREACH_INOTIFY_EVENT(e, buffer, l) { | |
1337 | Unit *u; | |
1338 | ||
1339 | if (e->wd < 0) | |
1340 | /* Queue overflow has no watch descriptor */ | |
1341 | continue; | |
1342 | ||
1343 | if (e->mask & IN_IGNORED) | |
1344 | /* The watch was just removed */ | |
1345 | continue; | |
1346 | ||
1347 | u = hashmap_get(m->cgroup_inotify_wd_unit, INT_TO_PTR(e->wd)); | |
1348 | if (!u) /* Not that inotify might deliver | |
1349 | * events for a watch even after it | |
1350 | * was removed, because it was queued | |
1351 | * before the removal. Let's ignore | |
1352 | * this here safely. */ | |
1353 | continue; | |
1354 | ||
1355 | (void) unit_notify_cgroup_empty(u); | |
1356 | } | |
1357 | } | |
8e274523 LP |
1358 | } |
1359 | ||
8e274523 | 1360 | int manager_setup_cgroup(Manager *m) { |
9444b1f2 | 1361 | _cleanup_free_ char *path = NULL; |
efdb0237 LP |
1362 | CGroupController c; |
1363 | int r, unified; | |
1364 | char *e; | |
8e274523 LP |
1365 | |
1366 | assert(m); | |
1367 | ||
35d2e7ec | 1368 | /* 1. Determine hierarchy */ |
efdb0237 | 1369 | m->cgroup_root = mfree(m->cgroup_root); |
9444b1f2 | 1370 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &m->cgroup_root); |
23bbb0de MS |
1371 | if (r < 0) |
1372 | return log_error_errno(r, "Cannot determine cgroup we are running in: %m"); | |
8e274523 | 1373 | |
efdb0237 LP |
1374 | /* Chop off the init scope, if we are already located in it */ |
1375 | e = endswith(m->cgroup_root, "/" SPECIAL_INIT_SCOPE); | |
0d8c31ff | 1376 | |
efdb0237 LP |
1377 | /* LEGACY: Also chop off the system slice if we are in |
1378 | * it. This is to support live upgrades from older systemd | |
1379 | * versions where PID 1 was moved there. Also see | |
1380 | * cg_get_root_path(). */ | |
1381 | if (!e && m->running_as == MANAGER_SYSTEM) { | |
9444b1f2 | 1382 | e = endswith(m->cgroup_root, "/" SPECIAL_SYSTEM_SLICE); |
15c60e99 | 1383 | if (!e) |
efdb0237 | 1384 | e = endswith(m->cgroup_root, "/system"); /* even more legacy */ |
0baf24dd | 1385 | } |
efdb0237 LP |
1386 | if (e) |
1387 | *e = 0; | |
7ccfb64a | 1388 | |
9444b1f2 LP |
1389 | /* And make sure to store away the root value without trailing |
1390 | * slash, even for the root dir, so that we can easily prepend | |
1391 | * it everywhere. */ | |
efdb0237 LP |
1392 | while ((e = endswith(m->cgroup_root, "/"))) |
1393 | *e = 0; | |
8e274523 | 1394 | |
35d2e7ec | 1395 | /* 2. Show data */ |
9444b1f2 | 1396 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, NULL, &path); |
23bbb0de MS |
1397 | if (r < 0) |
1398 | return log_error_errno(r, "Cannot find cgroup mount point: %m"); | |
8e274523 | 1399 | |
efdb0237 LP |
1400 | unified = cg_unified(); |
1401 | if (unified < 0) | |
1402 | return log_error_errno(r, "Couldn't determine if we are running in the unified hierarchy: %m"); | |
1403 | if (unified > 0) | |
1404 | log_debug("Unified cgroup hierarchy is located at %s.", path); | |
1405 | else | |
1406 | log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path); | |
1407 | ||
0d8c31ff | 1408 | if (!m->test_run) { |
efdb0237 | 1409 | const char *scope_path; |
c6c18be3 | 1410 | |
0d8c31ff | 1411 | /* 3. Install agent */ |
efdb0237 LP |
1412 | if (unified) { |
1413 | ||
1414 | /* In the unified hierarchy we can can get | |
1415 | * cgroup empty notifications via inotify. */ | |
1416 | ||
1417 | m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source); | |
1418 | safe_close(m->cgroup_inotify_fd); | |
1419 | ||
1420 | m->cgroup_inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); | |
1421 | if (m->cgroup_inotify_fd < 0) | |
1422 | return log_error_errno(errno, "Failed to create control group inotify object: %m"); | |
1423 | ||
1424 | r = sd_event_add_io(m->event, &m->cgroup_inotify_event_source, m->cgroup_inotify_fd, EPOLLIN, on_cgroup_inotify_event, m); | |
1425 | if (r < 0) | |
1426 | return log_error_errno(r, "Failed to watch control group inotify object: %m"); | |
1427 | ||
1428 | r = sd_event_source_set_priority(m->cgroup_inotify_event_source, SD_EVENT_PRIORITY_IDLE - 5); | |
1429 | if (r < 0) | |
1430 | return log_error_errno(r, "Failed to set priority of inotify event source: %m"); | |
1431 | ||
1432 | (void) sd_event_source_set_description(m->cgroup_inotify_event_source, "cgroup-inotify"); | |
1433 | ||
1434 | } else if (m->running_as == MANAGER_SYSTEM) { | |
1435 | ||
1436 | /* On the legacy hierarchy we only get | |
1437 | * notifications via cgroup agents. (Which | |
1438 | * isn't really reliable, since it does not | |
1439 | * generate events when control groups with | |
1440 | * children run empty. */ | |
1441 | ||
0d8c31ff ZJS |
1442 | r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH); |
1443 | if (r < 0) | |
da927ba9 | 1444 | log_warning_errno(r, "Failed to install release agent, ignoring: %m"); |
0d8c31ff ZJS |
1445 | else if (r > 0) |
1446 | log_debug("Installed release agent."); | |
efdb0237 | 1447 | else if (r == 0) |
0d8c31ff ZJS |
1448 | log_debug("Release agent already installed."); |
1449 | } | |
8e274523 | 1450 | |
efdb0237 LP |
1451 | /* 4. Make sure we are in the special "init.scope" unit in the root slice. */ |
1452 | scope_path = strjoina(m->cgroup_root, "/" SPECIAL_INIT_SCOPE); | |
1453 | r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, scope_path, 0); | |
23bbb0de | 1454 | if (r < 0) |
efdb0237 LP |
1455 | return log_error_errno(r, "Failed to create %s control group: %m", scope_path); |
1456 | ||
1457 | /* also, move all other userspace processes remaining | |
1458 | * in the root cgroup into that scope. */ | |
1459 | r = cg_migrate(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, SYSTEMD_CGROUP_CONTROLLER, scope_path, false); | |
1460 | if (r < 0) | |
1461 | log_warning_errno(r, "Couldn't move remaining userspace processes, ignoring: %m"); | |
c6c18be3 | 1462 | |
0d8c31ff ZJS |
1463 | /* 5. And pin it, so that it cannot be unmounted */ |
1464 | safe_close(m->pin_cgroupfs_fd); | |
0d8c31ff | 1465 | m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK); |
4a62c710 MS |
1466 | if (m->pin_cgroupfs_fd < 0) |
1467 | return log_error_errno(errno, "Failed to open pin file: %m"); | |
0d8c31ff | 1468 | |
cc98b302 | 1469 | /* 6. Always enable hierarchical support if it exists... */ |
efdb0237 LP |
1470 | if (!unified) |
1471 | (void) cg_set_attribute("memory", "/", "memory.use_hierarchy", "1"); | |
c6c18be3 LP |
1472 | } |
1473 | ||
0d8c31ff | 1474 | /* 7. Figure out which controllers are supported */ |
efdb0237 LP |
1475 | r = cg_mask_supported(&m->cgroup_supported); |
1476 | if (r < 0) | |
1477 | return log_error_errno(r, "Failed to determine supported controllers: %m"); | |
1478 | ||
1479 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) | |
1480 | log_debug("Controller '%s' supported: %s", cgroup_controller_to_string(c), yes_no(m->cgroup_supported & c)); | |
9156e799 | 1481 | |
a32360f1 | 1482 | return 0; |
8e274523 LP |
1483 | } |
1484 | ||
c6c18be3 | 1485 | void manager_shutdown_cgroup(Manager *m, bool delete) { |
8e274523 LP |
1486 | assert(m); |
1487 | ||
9444b1f2 LP |
1488 | /* We can't really delete the group, since we are in it. But |
1489 | * let's trim it. */ | |
1490 | if (delete && m->cgroup_root) | |
efdb0237 LP |
1491 | (void) cg_trim(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, false); |
1492 | ||
1493 | m->cgroup_inotify_wd_unit = hashmap_free(m->cgroup_inotify_wd_unit); | |
1494 | ||
1495 | m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source); | |
1496 | m->cgroup_inotify_fd = safe_close(m->cgroup_inotify_fd); | |
8e274523 | 1497 | |
03e334a1 | 1498 | m->pin_cgroupfs_fd = safe_close(m->pin_cgroupfs_fd); |
c6c18be3 | 1499 | |
efdb0237 | 1500 | m->cgroup_root = mfree(m->cgroup_root); |
8e274523 LP |
1501 | } |
1502 | ||
4ad49000 | 1503 | Unit* manager_get_unit_by_cgroup(Manager *m, const char *cgroup) { |
acb14d31 | 1504 | char *p; |
4ad49000 | 1505 | Unit *u; |
acb14d31 LP |
1506 | |
1507 | assert(m); | |
1508 | assert(cgroup); | |
acb14d31 | 1509 | |
4ad49000 LP |
1510 | u = hashmap_get(m->cgroup_unit, cgroup); |
1511 | if (u) | |
1512 | return u; | |
acb14d31 | 1513 | |
8e70580b | 1514 | p = strdupa(cgroup); |
acb14d31 LP |
1515 | for (;;) { |
1516 | char *e; | |
1517 | ||
1518 | e = strrchr(p, '/'); | |
efdb0237 LP |
1519 | if (!e || e == p) |
1520 | return hashmap_get(m->cgroup_unit, SPECIAL_ROOT_SLICE); | |
acb14d31 LP |
1521 | |
1522 | *e = 0; | |
1523 | ||
4ad49000 LP |
1524 | u = hashmap_get(m->cgroup_unit, p); |
1525 | if (u) | |
1526 | return u; | |
acb14d31 LP |
1527 | } |
1528 | } | |
1529 | ||
b3ac818b | 1530 | Unit *manager_get_unit_by_pid_cgroup(Manager *m, pid_t pid) { |
4ad49000 | 1531 | _cleanup_free_ char *cgroup = NULL; |
acb14d31 | 1532 | int r; |
8e274523 | 1533 | |
8c47c732 LP |
1534 | assert(m); |
1535 | ||
b3ac818b LP |
1536 | if (pid <= 0) |
1537 | return NULL; | |
1538 | ||
1539 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &cgroup); | |
1540 | if (r < 0) | |
1541 | return NULL; | |
1542 | ||
1543 | return manager_get_unit_by_cgroup(m, cgroup); | |
1544 | } | |
1545 | ||
1546 | Unit *manager_get_unit_by_pid(Manager *m, pid_t pid) { | |
1547 | Unit *u; | |
1548 | ||
1549 | assert(m); | |
1550 | ||
efdb0237 | 1551 | if (pid <= 0) |
8c47c732 LP |
1552 | return NULL; |
1553 | ||
efdb0237 LP |
1554 | if (pid == 1) |
1555 | return hashmap_get(m->units, SPECIAL_INIT_SCOPE); | |
1556 | ||
fea72cc0 | 1557 | u = hashmap_get(m->watch_pids1, PID_TO_PTR(pid)); |
5fe8876b LP |
1558 | if (u) |
1559 | return u; | |
1560 | ||
fea72cc0 | 1561 | u = hashmap_get(m->watch_pids2, PID_TO_PTR(pid)); |
5fe8876b LP |
1562 | if (u) |
1563 | return u; | |
1564 | ||
b3ac818b | 1565 | return manager_get_unit_by_pid_cgroup(m, pid); |
6dde1f33 | 1566 | } |
4fbf50b3 | 1567 | |
4ad49000 LP |
1568 | int manager_notify_cgroup_empty(Manager *m, const char *cgroup) { |
1569 | Unit *u; | |
4fbf50b3 | 1570 | |
4ad49000 LP |
1571 | assert(m); |
1572 | assert(cgroup); | |
4fbf50b3 | 1573 | |
4ad49000 | 1574 | u = manager_get_unit_by_cgroup(m, cgroup); |
5ad096b3 LP |
1575 | if (!u) |
1576 | return 0; | |
b56c28c3 | 1577 | |
efdb0237 | 1578 | return unit_notify_cgroup_empty(u); |
5ad096b3 LP |
1579 | } |
1580 | ||
1581 | int unit_get_memory_current(Unit *u, uint64_t *ret) { | |
1582 | _cleanup_free_ char *v = NULL; | |
1583 | int r; | |
1584 | ||
1585 | assert(u); | |
1586 | assert(ret); | |
1587 | ||
1588 | if (!u->cgroup_path) | |
1589 | return -ENODATA; | |
1590 | ||
efdb0237 | 1591 | if ((u->cgroup_realized_mask & CGROUP_MASK_MEMORY) == 0) |
5ad096b3 LP |
1592 | return -ENODATA; |
1593 | ||
efdb0237 LP |
1594 | if (cg_unified() <= 0) |
1595 | r = cg_get_attribute("memory", u->cgroup_path, "memory.usage_in_bytes", &v); | |
1596 | else | |
1597 | r = cg_get_attribute("memory", u->cgroup_path, "memory.current", &v); | |
5ad096b3 LP |
1598 | if (r == -ENOENT) |
1599 | return -ENODATA; | |
1600 | if (r < 0) | |
1601 | return r; | |
1602 | ||
1603 | return safe_atou64(v, ret); | |
1604 | } | |
1605 | ||
03a7b521 LP |
1606 | int unit_get_tasks_current(Unit *u, uint64_t *ret) { |
1607 | _cleanup_free_ char *v = NULL; | |
1608 | int r; | |
1609 | ||
1610 | assert(u); | |
1611 | assert(ret); | |
1612 | ||
1613 | if (!u->cgroup_path) | |
1614 | return -ENODATA; | |
1615 | ||
1616 | if ((u->cgroup_realized_mask & CGROUP_MASK_PIDS) == 0) | |
1617 | return -ENODATA; | |
1618 | ||
1619 | r = cg_get_attribute("pids", u->cgroup_path, "pids.current", &v); | |
1620 | if (r == -ENOENT) | |
1621 | return -ENODATA; | |
1622 | if (r < 0) | |
1623 | return r; | |
1624 | ||
1625 | return safe_atou64(v, ret); | |
1626 | } | |
1627 | ||
5ad096b3 LP |
1628 | static int unit_get_cpu_usage_raw(Unit *u, nsec_t *ret) { |
1629 | _cleanup_free_ char *v = NULL; | |
1630 | uint64_t ns; | |
1631 | int r; | |
1632 | ||
1633 | assert(u); | |
1634 | assert(ret); | |
1635 | ||
1636 | if (!u->cgroup_path) | |
1637 | return -ENODATA; | |
1638 | ||
efdb0237 | 1639 | if ((u->cgroup_realized_mask & CGROUP_MASK_CPUACCT) == 0) |
5ad096b3 LP |
1640 | return -ENODATA; |
1641 | ||
1642 | r = cg_get_attribute("cpuacct", u->cgroup_path, "cpuacct.usage", &v); | |
1643 | if (r == -ENOENT) | |
1644 | return -ENODATA; | |
1645 | if (r < 0) | |
1646 | return r; | |
1647 | ||
1648 | r = safe_atou64(v, &ns); | |
1649 | if (r < 0) | |
1650 | return r; | |
1651 | ||
1652 | *ret = ns; | |
1653 | return 0; | |
1654 | } | |
1655 | ||
1656 | int unit_get_cpu_usage(Unit *u, nsec_t *ret) { | |
1657 | nsec_t ns; | |
1658 | int r; | |
1659 | ||
1660 | r = unit_get_cpu_usage_raw(u, &ns); | |
1661 | if (r < 0) | |
1662 | return r; | |
1663 | ||
1664 | if (ns > u->cpuacct_usage_base) | |
1665 | ns -= u->cpuacct_usage_base; | |
1666 | else | |
1667 | ns = 0; | |
1668 | ||
1669 | *ret = ns; | |
1670 | return 0; | |
1671 | } | |
1672 | ||
1673 | int unit_reset_cpu_usage(Unit *u) { | |
1674 | nsec_t ns; | |
1675 | int r; | |
1676 | ||
1677 | assert(u); | |
1678 | ||
1679 | r = unit_get_cpu_usage_raw(u, &ns); | |
1680 | if (r < 0) { | |
1681 | u->cpuacct_usage_base = 0; | |
1682 | return r; | |
b56c28c3 | 1683 | } |
2633eb83 | 1684 | |
5ad096b3 | 1685 | u->cpuacct_usage_base = ns; |
4ad49000 | 1686 | return 0; |
4fbf50b3 LP |
1687 | } |
1688 | ||
e9db43d5 LP |
1689 | bool unit_cgroup_delegate(Unit *u) { |
1690 | CGroupContext *c; | |
1691 | ||
1692 | assert(u); | |
1693 | ||
1694 | c = unit_get_cgroup_context(u); | |
1695 | if (!c) | |
1696 | return false; | |
1697 | ||
1698 | return c->delegate; | |
1699 | } | |
1700 | ||
e7ab4d1a LP |
1701 | void unit_invalidate_cgroup(Unit *u, CGroupMask m) { |
1702 | assert(u); | |
1703 | ||
1704 | if (!UNIT_HAS_CGROUP_CONTEXT(u)) | |
1705 | return; | |
1706 | ||
1707 | if (m == 0) | |
1708 | return; | |
1709 | ||
1710 | if ((u->cgroup_realized_mask & m) == 0) | |
1711 | return; | |
1712 | ||
1713 | u->cgroup_realized_mask &= ~m; | |
1714 | unit_add_to_cgroup_queue(u); | |
1715 | } | |
1716 | ||
1717 | void manager_invalidate_startup_units(Manager *m) { | |
1718 | Iterator i; | |
1719 | Unit *u; | |
1720 | ||
1721 | assert(m); | |
1722 | ||
1723 | SET_FOREACH(u, m->startup_units, i) | |
1724 | unit_invalidate_cgroup(u, CGROUP_MASK_CPU|CGROUP_MASK_BLKIO); | |
1725 | } | |
1726 | ||
4ad49000 LP |
1727 | static const char* const cgroup_device_policy_table[_CGROUP_DEVICE_POLICY_MAX] = { |
1728 | [CGROUP_AUTO] = "auto", | |
1729 | [CGROUP_CLOSED] = "closed", | |
1730 | [CGROUP_STRICT] = "strict", | |
1731 | }; | |
4fbf50b3 | 1732 | |
4ad49000 | 1733 | DEFINE_STRING_TABLE_LOOKUP(cgroup_device_policy, CGroupDevicePolicy); |