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