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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
a016b922 LP |
2 | |
3 | #include <errno.h> | |
a016b922 | 4 | |
b5efdb8a | 5 | #include "alloc-util.h" |
07630cea | 6 | #include "dbus-slice.h" |
a016b922 | 7 | #include "log.h" |
d68c645b | 8 | #include "serialize.h" |
cf0fbc49 | 9 | #include "slice.h" |
a016b922 | 10 | #include "special.h" |
07630cea LP |
11 | #include "string-util.h" |
12 | #include "strv.h" | |
a016b922 | 13 | #include "unit-name.h" |
efdb0237 | 14 | #include "unit.h" |
a016b922 LP |
15 | |
16 | static const UnitActiveState state_translation_table[_SLICE_STATE_MAX] = { | |
17 | [SLICE_DEAD] = UNIT_INACTIVE, | |
18 | [SLICE_ACTIVE] = UNIT_ACTIVE | |
19 | }; | |
20 | ||
1b4cd0cf LP |
21 | static void slice_init(Unit *u) { |
22 | assert(u); | |
23 | assert(u->load_state == UNIT_STUB); | |
24 | ||
25 | u->ignore_on_isolate = true; | |
26 | } | |
27 | ||
a016b922 LP |
28 | static void slice_set_state(Slice *t, SliceState state) { |
29 | SliceState old_state; | |
30 | assert(t); | |
31 | ||
32 | old_state = t->state; | |
33 | t->state = state; | |
34 | ||
35 | if (state != old_state) | |
36 | log_debug("%s changed %s -> %s", | |
37 | UNIT(t)->id, | |
38 | slice_state_to_string(old_state), | |
39 | slice_state_to_string(state)); | |
40 | ||
2ad2e41a | 41 | unit_notify(UNIT(t), state_translation_table[old_state], state_translation_table[state], 0); |
a016b922 LP |
42 | } |
43 | ||
4ad49000 | 44 | static int slice_add_parent_slice(Slice *s) { |
a7894207 ZJS |
45 | Unit *u = UNIT(s), *parent; |
46 | _cleanup_free_ char *a = NULL; | |
4ad49000 | 47 | int r; |
a016b922 LP |
48 | |
49 | assert(s); | |
50 | ||
a7894207 | 51 | if (UNIT_ISSET(u->slice)) |
a016b922 LP |
52 | return 0; |
53 | ||
a7894207 ZJS |
54 | r = slice_build_parent_slice(u->id, &a); |
55 | if (r <= 0) /* 0 means root slice */ | |
56 | return r; | |
a016b922 | 57 | |
a7894207 | 58 | r = manager_load_unit(u->manager, a, NULL, NULL, &parent); |
a016b922 LP |
59 | if (r < 0) |
60 | return r; | |
61 | ||
7f7d01ed | 62 | unit_ref_set(&u->slice, u, parent); |
a016b922 LP |
63 | return 0; |
64 | } | |
65 | ||
66 | static int slice_add_default_dependencies(Slice *s) { | |
67 | int r; | |
68 | ||
69 | assert(s); | |
70 | ||
4c9ea260 LP |
71 | if (!UNIT(s)->default_dependencies) |
72 | return 0; | |
73 | ||
a016b922 | 74 | /* Make sure slices are unloaded on shutdown */ |
6c12b52e LP |
75 | r = unit_add_two_dependencies_by_name( |
76 | UNIT(s), | |
77 | UNIT_BEFORE, UNIT_CONFLICTS, | |
5a724170 | 78 | SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT); |
a016b922 LP |
79 | if (r < 0) |
80 | return r; | |
81 | ||
82 | return 0; | |
83 | } | |
84 | ||
85 | static int slice_verify(Slice *s) { | |
93c47472 LP |
86 | _cleanup_free_ char *parent = NULL; |
87 | int r; | |
88 | ||
a016b922 LP |
89 | assert(s); |
90 | ||
91 | if (UNIT(s)->load_state != UNIT_LOADED) | |
92 | return 0; | |
93 | ||
93c47472 | 94 | if (!slice_name_is_valid(UNIT(s)->id)) { |
f2341e0a | 95 | log_unit_error(UNIT(s), "Slice name %s is not valid. Refusing.", UNIT(s)->id); |
6f40aa45 | 96 | return -ENOEXEC; |
93c47472 LP |
97 | } |
98 | ||
99 | r = slice_build_parent_slice(UNIT(s)->id, &parent); | |
100 | if (r < 0) | |
f2341e0a | 101 | return log_unit_error_errno(UNIT(s), r, "Failed to determine parent slice: %m"); |
93c47472 LP |
102 | |
103 | if (parent ? !unit_has_name(UNIT_DEREF(UNIT(s)->slice), parent) : UNIT_ISSET(UNIT(s)->slice)) { | |
f2341e0a | 104 | log_unit_error(UNIT(s), "Located outside of parent slice. Refusing."); |
6f40aa45 | 105 | return -ENOEXEC; |
a016b922 LP |
106 | } |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
8e4e851f LP |
111 | static int slice_load_root_slice(Unit *u) { |
112 | assert(u); | |
113 | ||
114 | if (!unit_has_name(u, SPECIAL_ROOT_SLICE)) | |
115 | return 0; | |
116 | ||
f5869324 | 117 | u->perpetual = true; |
8e4e851f LP |
118 | |
119 | /* The root slice is a bit special. For example it is always running and cannot be terminated. Because of its | |
120 | * special semantics we synthesize it here, instead of relying on the unit file on disk. */ | |
121 | ||
122 | u->default_dependencies = false; | |
8e4e851f LP |
123 | |
124 | if (!u->description) | |
125 | u->description = strdup("Root Slice"); | |
126 | if (!u->documentation) | |
127 | u->documentation = strv_new("man:systemd.special(7)", NULL); | |
128 | ||
129 | return 1; | |
130 | } | |
131 | ||
d8e5a933 AJ |
132 | static int slice_load_system_slice(Unit *u) { |
133 | assert(u); | |
134 | ||
135 | if (!MANAGER_IS_SYSTEM(u->manager)) | |
136 | return 0; | |
137 | if (!unit_has_name(u, SPECIAL_SYSTEM_SLICE)) | |
138 | return 0; | |
139 | ||
140 | u->perpetual = true; | |
141 | ||
142 | /* The system slice is a bit special. For example it is always running and cannot be terminated. Because of its | |
143 | * special semantics we synthesize it here, instead of relying on the unit file on disk. */ | |
144 | ||
145 | u->default_dependencies = false; | |
146 | ||
147 | if (!u->description) | |
148 | u->description = strdup("System Slice"); | |
149 | if (!u->documentation) | |
150 | u->documentation = strv_new("man:systemd.special(7)", NULL); | |
151 | ||
152 | return 1; | |
153 | } | |
154 | ||
a016b922 LP |
155 | static int slice_load(Unit *u) { |
156 | Slice *s = SLICE(u); | |
157 | int r; | |
158 | ||
159 | assert(s); | |
4f4afc88 | 160 | assert(u->load_state == UNIT_STUB); |
a016b922 | 161 | |
8e4e851f LP |
162 | r = slice_load_root_slice(u); |
163 | if (r < 0) | |
164 | return r; | |
d8e5a933 AJ |
165 | r = slice_load_system_slice(u); |
166 | if (r < 0) | |
167 | return r; | |
168 | ||
4ad49000 | 169 | r = unit_load_fragment_and_dropin_optional(u); |
a016b922 LP |
170 | if (r < 0) |
171 | return r; | |
172 | ||
173 | /* This is a new unit? Then let's add in some extras */ | |
174 | if (u->load_state == UNIT_LOADED) { | |
175 | ||
598459ce LP |
176 | r = unit_patch_contexts(u); |
177 | if (r < 0) | |
178 | return r; | |
179 | ||
4ad49000 | 180 | r = slice_add_parent_slice(s); |
a016b922 LP |
181 | if (r < 0) |
182 | return r; | |
183 | ||
4c9ea260 LP |
184 | r = slice_add_default_dependencies(s); |
185 | if (r < 0) | |
186 | return r; | |
a016b922 LP |
187 | } |
188 | ||
189 | return slice_verify(s); | |
190 | } | |
191 | ||
be847e82 | 192 | static int slice_coldplug(Unit *u) { |
a016b922 LP |
193 | Slice *t = SLICE(u); |
194 | ||
195 | assert(t); | |
196 | assert(t->state == SLICE_DEAD); | |
197 | ||
198 | if (t->deserialized_state != t->state) | |
199 | slice_set_state(t, t->deserialized_state); | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
204 | static void slice_dump(Unit *u, FILE *f, const char *prefix) { | |
205 | Slice *t = SLICE(u); | |
206 | ||
207 | assert(t); | |
208 | assert(f); | |
209 | ||
210 | fprintf(f, | |
211 | "%sSlice State: %s\n", | |
212 | prefix, slice_state_to_string(t->state)); | |
4ad49000 LP |
213 | |
214 | cgroup_context_dump(&t->cgroup_context, f, prefix); | |
a016b922 LP |
215 | } |
216 | ||
217 | static int slice_start(Unit *u) { | |
218 | Slice *t = SLICE(u); | |
4b58153d | 219 | int r; |
a016b922 LP |
220 | |
221 | assert(t); | |
222 | assert(t->state == SLICE_DEAD); | |
223 | ||
4b58153d LP |
224 | r = unit_acquire_invocation_id(u); |
225 | if (r < 0) | |
226 | return r; | |
227 | ||
5ad096b3 | 228 | (void) unit_realize_cgroup(u); |
906c06f6 DM |
229 | (void) unit_reset_cpu_accounting(u); |
230 | (void) unit_reset_ip_accounting(u); | |
a016b922 LP |
231 | |
232 | slice_set_state(t, SLICE_ACTIVE); | |
82a2b6bb | 233 | return 1; |
a016b922 LP |
234 | } |
235 | ||
236 | static int slice_stop(Unit *u) { | |
237 | Slice *t = SLICE(u); | |
238 | ||
239 | assert(t); | |
240 | assert(t->state == SLICE_ACTIVE); | |
241 | ||
4ad49000 LP |
242 | /* We do not need to destroy the cgroup explicitly, |
243 | * unit_notify() will do that for us anyway. */ | |
a016b922 LP |
244 | |
245 | slice_set_state(t, SLICE_DEAD); | |
82a2b6bb | 246 | return 1; |
a016b922 LP |
247 | } |
248 | ||
718db961 | 249 | static int slice_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { |
a016b922 LP |
250 | return unit_kill_common(u, who, signo, -1, -1, error); |
251 | } | |
252 | ||
253 | static int slice_serialize(Unit *u, FILE *f, FDSet *fds) { | |
254 | Slice *s = SLICE(u); | |
255 | ||
256 | assert(s); | |
257 | assert(f); | |
258 | assert(fds); | |
259 | ||
d68c645b LP |
260 | (void) serialize_item(f, "state", slice_state_to_string(s->state)); |
261 | ||
a016b922 LP |
262 | return 0; |
263 | } | |
264 | ||
265 | static int slice_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
266 | Slice *s = SLICE(u); | |
267 | ||
268 | assert(u); | |
269 | assert(key); | |
270 | assert(value); | |
271 | assert(fds); | |
272 | ||
273 | if (streq(key, "state")) { | |
274 | SliceState state; | |
275 | ||
276 | state = slice_state_from_string(value); | |
277 | if (state < 0) | |
278 | log_debug("Failed to parse state value %s", value); | |
279 | else | |
280 | s->deserialized_state = state; | |
281 | ||
282 | } else | |
283 | log_debug("Unknown serialization key '%s'", key); | |
284 | ||
285 | return 0; | |
286 | } | |
287 | ||
288 | _pure_ static UnitActiveState slice_active_state(Unit *u) { | |
289 | assert(u); | |
290 | ||
291 | return state_translation_table[SLICE(u)->state]; | |
292 | } | |
293 | ||
294 | _pure_ static const char *slice_sub_state_to_string(Unit *u) { | |
295 | assert(u); | |
296 | ||
297 | return slice_state_to_string(SLICE(u)->state); | |
298 | } | |
299 | ||
cc6271f1 | 300 | static int slice_make_perpetual(Manager *m, const char *name, Unit **ret) { |
efdb0237 LP |
301 | Unit *u; |
302 | int r; | |
303 | ||
304 | assert(m); | |
cc6271f1 | 305 | assert(name); |
efdb0237 | 306 | |
d8e5a933 | 307 | u = manager_get_unit(m, name); |
efdb0237 | 308 | if (!u) { |
d8e5a933 | 309 | r = unit_new_for_name(m, sizeof(Slice), name, &u); |
cc6271f1 LP |
310 | if (r < 0) |
311 | return log_error_errno(r, "Failed to allocate the special %s unit: %m", name); | |
efdb0237 LP |
312 | } |
313 | ||
f5869324 | 314 | u->perpetual = true; |
efdb0237 LP |
315 | SLICE(u)->deserialized_state = SLICE_ACTIVE; |
316 | ||
efdb0237 LP |
317 | unit_add_to_load_queue(u); |
318 | unit_add_to_dbus_queue(u); | |
cc6271f1 LP |
319 | |
320 | if (ret) | |
321 | *ret = u; | |
322 | ||
323 | return 0; | |
efdb0237 LP |
324 | } |
325 | ||
04eb582a | 326 | static void slice_enumerate_perpetual(Manager *m) { |
cc6271f1 LP |
327 | Unit *u; |
328 | int r; | |
329 | ||
d8e5a933 AJ |
330 | assert(m); |
331 | ||
cc6271f1 LP |
332 | r = slice_make_perpetual(m, SPECIAL_ROOT_SLICE, &u); |
333 | if (r >= 0 && manager_owns_root_cgroup(m)) { | |
334 | Slice *s = SLICE(u); | |
335 | ||
336 | /* If we are managing the root cgroup then this means our root slice covers the whole system, which | |
337 | * means the kernel will track CPU/tasks/memory for us anyway, and it is all available in /proc. Let's | |
338 | * hence turn accounting on here, so that our APIs to query this data are available. */ | |
339 | ||
340 | s->cgroup_context.cpu_accounting = true; | |
341 | s->cgroup_context.tasks_accounting = true; | |
342 | s->cgroup_context.memory_accounting = true; | |
343 | } | |
d8e5a933 AJ |
344 | |
345 | if (MANAGER_IS_SYSTEM(m)) | |
cc6271f1 | 346 | (void) slice_make_perpetual(m, SPECIAL_SYSTEM_SLICE, NULL); |
d8e5a933 AJ |
347 | } |
348 | ||
a016b922 LP |
349 | const UnitVTable slice_vtable = { |
350 | .object_size = sizeof(Slice), | |
718db961 LP |
351 | .cgroup_context_offset = offsetof(Slice, cgroup_context), |
352 | ||
a016b922 LP |
353 | .sections = |
354 | "Unit\0" | |
355 | "Slice\0" | |
356 | "Install\0", | |
4ad49000 | 357 | .private_section = "Slice", |
4ad49000 | 358 | |
17f62e9b | 359 | .can_transient = true, |
a016b922 | 360 | |
1b4cd0cf | 361 | .init = slice_init, |
a016b922 | 362 | .load = slice_load, |
4ad49000 | 363 | |
a016b922 LP |
364 | .coldplug = slice_coldplug, |
365 | ||
366 | .dump = slice_dump, | |
367 | ||
368 | .start = slice_start, | |
369 | .stop = slice_stop, | |
370 | ||
371 | .kill = slice_kill, | |
372 | ||
373 | .serialize = slice_serialize, | |
374 | .deserialize_item = slice_deserialize_item, | |
375 | ||
376 | .active_state = slice_active_state, | |
377 | .sub_state_to_string = slice_sub_state_to_string, | |
378 | ||
718db961 | 379 | .bus_vtable = bus_slice_vtable, |
8e2af478 LP |
380 | .bus_set_property = bus_slice_set_property, |
381 | .bus_commit_properties = bus_slice_commit_properties, | |
a016b922 | 382 | |
04eb582a | 383 | .enumerate_perpetual = slice_enumerate_perpetual, |
efdb0237 | 384 | |
a016b922 LP |
385 | .status_message_formats = { |
386 | .finished_start_job = { | |
4ad49000 | 387 | [JOB_DONE] = "Created slice %s.", |
a016b922 LP |
388 | }, |
389 | .finished_stop_job = { | |
4ad49000 | 390 | [JOB_DONE] = "Removed slice %s.", |
a016b922 LP |
391 | }, |
392 | }, | |
393 | }; |