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