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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
a016b922 LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2013 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
21 | #include <errno.h> | |
a016b922 | 22 | |
b5efdb8a | 23 | #include "alloc-util.h" |
07630cea | 24 | #include "dbus-slice.h" |
a016b922 | 25 | #include "log.h" |
cf0fbc49 | 26 | #include "slice.h" |
a016b922 | 27 | #include "special.h" |
07630cea LP |
28 | #include "string-util.h" |
29 | #include "strv.h" | |
a016b922 | 30 | #include "unit-name.h" |
efdb0237 | 31 | #include "unit.h" |
a016b922 LP |
32 | |
33 | static const UnitActiveState state_translation_table[_SLICE_STATE_MAX] = { | |
34 | [SLICE_DEAD] = UNIT_INACTIVE, | |
35 | [SLICE_ACTIVE] = UNIT_ACTIVE | |
36 | }; | |
37 | ||
1b4cd0cf LP |
38 | static void slice_init(Unit *u) { |
39 | assert(u); | |
40 | assert(u->load_state == UNIT_STUB); | |
41 | ||
42 | u->ignore_on_isolate = true; | |
43 | } | |
44 | ||
a016b922 LP |
45 | static void slice_set_state(Slice *t, SliceState state) { |
46 | SliceState old_state; | |
47 | assert(t); | |
48 | ||
49 | old_state = t->state; | |
50 | t->state = state; | |
51 | ||
52 | if (state != old_state) | |
53 | log_debug("%s changed %s -> %s", | |
54 | UNIT(t)->id, | |
55 | slice_state_to_string(old_state), | |
56 | slice_state_to_string(state)); | |
57 | ||
58 | unit_notify(UNIT(t), state_translation_table[old_state], state_translation_table[state], true); | |
59 | } | |
60 | ||
4ad49000 | 61 | static int slice_add_parent_slice(Slice *s) { |
a7894207 ZJS |
62 | Unit *u = UNIT(s), *parent; |
63 | _cleanup_free_ char *a = NULL; | |
4ad49000 | 64 | int r; |
a016b922 LP |
65 | |
66 | assert(s); | |
67 | ||
a7894207 | 68 | if (UNIT_ISSET(u->slice)) |
a016b922 LP |
69 | return 0; |
70 | ||
a7894207 ZJS |
71 | r = slice_build_parent_slice(u->id, &a); |
72 | if (r <= 0) /* 0 means root slice */ | |
73 | return r; | |
a016b922 | 74 | |
a7894207 | 75 | r = manager_load_unit(u->manager, a, NULL, NULL, &parent); |
a016b922 LP |
76 | if (r < 0) |
77 | return r; | |
78 | ||
a7894207 | 79 | unit_ref_set(&u->slice, parent); |
a016b922 LP |
80 | return 0; |
81 | } | |
82 | ||
83 | static int slice_add_default_dependencies(Slice *s) { | |
84 | int r; | |
85 | ||
86 | assert(s); | |
87 | ||
4c9ea260 LP |
88 | if (!UNIT(s)->default_dependencies) |
89 | return 0; | |
90 | ||
a016b922 | 91 | /* Make sure slices are unloaded on shutdown */ |
6c12b52e LP |
92 | r = unit_add_two_dependencies_by_name( |
93 | UNIT(s), | |
94 | UNIT_BEFORE, UNIT_CONFLICTS, | |
eef85c4a | 95 | SPECIAL_SHUTDOWN_TARGET, NULL, true, UNIT_DEPENDENCY_DEFAULT); |
a016b922 LP |
96 | if (r < 0) |
97 | return r; | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
102 | static int slice_verify(Slice *s) { | |
93c47472 LP |
103 | _cleanup_free_ char *parent = NULL; |
104 | int r; | |
105 | ||
a016b922 LP |
106 | assert(s); |
107 | ||
108 | if (UNIT(s)->load_state != UNIT_LOADED) | |
109 | return 0; | |
110 | ||
93c47472 | 111 | if (!slice_name_is_valid(UNIT(s)->id)) { |
f2341e0a | 112 | log_unit_error(UNIT(s), "Slice name %s is not valid. Refusing.", UNIT(s)->id); |
93c47472 LP |
113 | return -EINVAL; |
114 | } | |
115 | ||
116 | r = slice_build_parent_slice(UNIT(s)->id, &parent); | |
117 | if (r < 0) | |
f2341e0a | 118 | return log_unit_error_errno(UNIT(s), r, "Failed to determine parent slice: %m"); |
93c47472 LP |
119 | |
120 | if (parent ? !unit_has_name(UNIT_DEREF(UNIT(s)->slice), parent) : UNIT_ISSET(UNIT(s)->slice)) { | |
f2341e0a | 121 | log_unit_error(UNIT(s), "Located outside of parent slice. Refusing."); |
93c47472 | 122 | return -EINVAL; |
a016b922 LP |
123 | } |
124 | ||
125 | return 0; | |
126 | } | |
127 | ||
8e4e851f LP |
128 | static int slice_load_root_slice(Unit *u) { |
129 | assert(u); | |
130 | ||
131 | if (!unit_has_name(u, SPECIAL_ROOT_SLICE)) | |
132 | return 0; | |
133 | ||
f5869324 | 134 | u->perpetual = true; |
8e4e851f LP |
135 | |
136 | /* The root slice is a bit special. For example it is always running and cannot be terminated. Because of its | |
137 | * special semantics we synthesize it here, instead of relying on the unit file on disk. */ | |
138 | ||
139 | u->default_dependencies = false; | |
8e4e851f LP |
140 | |
141 | if (!u->description) | |
142 | u->description = strdup("Root Slice"); | |
143 | if (!u->documentation) | |
144 | u->documentation = strv_new("man:systemd.special(7)", NULL); | |
145 | ||
146 | return 1; | |
147 | } | |
148 | ||
a016b922 LP |
149 | static int slice_load(Unit *u) { |
150 | Slice *s = SLICE(u); | |
151 | int r; | |
152 | ||
153 | assert(s); | |
4f4afc88 | 154 | assert(u->load_state == UNIT_STUB); |
a016b922 | 155 | |
8e4e851f LP |
156 | r = slice_load_root_slice(u); |
157 | if (r < 0) | |
158 | return r; | |
4ad49000 | 159 | r = unit_load_fragment_and_dropin_optional(u); |
a016b922 LP |
160 | if (r < 0) |
161 | return r; | |
162 | ||
163 | /* This is a new unit? Then let's add in some extras */ | |
164 | if (u->load_state == UNIT_LOADED) { | |
165 | ||
598459ce LP |
166 | r = unit_patch_contexts(u); |
167 | if (r < 0) | |
168 | return r; | |
169 | ||
4ad49000 | 170 | r = slice_add_parent_slice(s); |
a016b922 LP |
171 | if (r < 0) |
172 | return r; | |
173 | ||
4c9ea260 LP |
174 | r = slice_add_default_dependencies(s); |
175 | if (r < 0) | |
176 | return r; | |
a016b922 LP |
177 | } |
178 | ||
179 | return slice_verify(s); | |
180 | } | |
181 | ||
be847e82 | 182 | static int slice_coldplug(Unit *u) { |
a016b922 LP |
183 | Slice *t = SLICE(u); |
184 | ||
185 | assert(t); | |
186 | assert(t->state == SLICE_DEAD); | |
187 | ||
188 | if (t->deserialized_state != t->state) | |
189 | slice_set_state(t, t->deserialized_state); | |
190 | ||
191 | return 0; | |
192 | } | |
193 | ||
194 | static void slice_dump(Unit *u, FILE *f, const char *prefix) { | |
195 | Slice *t = SLICE(u); | |
196 | ||
197 | assert(t); | |
198 | assert(f); | |
199 | ||
200 | fprintf(f, | |
201 | "%sSlice State: %s\n", | |
202 | prefix, slice_state_to_string(t->state)); | |
4ad49000 LP |
203 | |
204 | cgroup_context_dump(&t->cgroup_context, f, prefix); | |
a016b922 LP |
205 | } |
206 | ||
207 | static int slice_start(Unit *u) { | |
208 | Slice *t = SLICE(u); | |
4b58153d | 209 | int r; |
a016b922 LP |
210 | |
211 | assert(t); | |
212 | assert(t->state == SLICE_DEAD); | |
213 | ||
4b58153d LP |
214 | r = unit_acquire_invocation_id(u); |
215 | if (r < 0) | |
216 | return r; | |
217 | ||
5ad096b3 | 218 | (void) unit_realize_cgroup(u); |
906c06f6 DM |
219 | (void) unit_reset_cpu_accounting(u); |
220 | (void) unit_reset_ip_accounting(u); | |
a016b922 LP |
221 | |
222 | slice_set_state(t, SLICE_ACTIVE); | |
82a2b6bb | 223 | return 1; |
a016b922 LP |
224 | } |
225 | ||
226 | static int slice_stop(Unit *u) { | |
227 | Slice *t = SLICE(u); | |
228 | ||
229 | assert(t); | |
230 | assert(t->state == SLICE_ACTIVE); | |
231 | ||
4ad49000 LP |
232 | /* We do not need to destroy the cgroup explicitly, |
233 | * unit_notify() will do that for us anyway. */ | |
a016b922 LP |
234 | |
235 | slice_set_state(t, SLICE_DEAD); | |
82a2b6bb | 236 | return 1; |
a016b922 LP |
237 | } |
238 | ||
718db961 | 239 | static int slice_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { |
a016b922 LP |
240 | return unit_kill_common(u, who, signo, -1, -1, error); |
241 | } | |
242 | ||
243 | static int slice_serialize(Unit *u, FILE *f, FDSet *fds) { | |
244 | Slice *s = SLICE(u); | |
245 | ||
246 | assert(s); | |
247 | assert(f); | |
248 | assert(fds); | |
249 | ||
250 | unit_serialize_item(u, f, "state", slice_state_to_string(s->state)); | |
251 | return 0; | |
252 | } | |
253 | ||
254 | static int slice_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
255 | Slice *s = SLICE(u); | |
256 | ||
257 | assert(u); | |
258 | assert(key); | |
259 | assert(value); | |
260 | assert(fds); | |
261 | ||
262 | if (streq(key, "state")) { | |
263 | SliceState state; | |
264 | ||
265 | state = slice_state_from_string(value); | |
266 | if (state < 0) | |
267 | log_debug("Failed to parse state value %s", value); | |
268 | else | |
269 | s->deserialized_state = state; | |
270 | ||
271 | } else | |
272 | log_debug("Unknown serialization key '%s'", key); | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
277 | _pure_ static UnitActiveState slice_active_state(Unit *u) { | |
278 | assert(u); | |
279 | ||
280 | return state_translation_table[SLICE(u)->state]; | |
281 | } | |
282 | ||
283 | _pure_ static const char *slice_sub_state_to_string(Unit *u) { | |
284 | assert(u); | |
285 | ||
286 | return slice_state_to_string(SLICE(u)->state); | |
287 | } | |
288 | ||
ba64af90 | 289 | static void slice_enumerate(Manager *m) { |
efdb0237 LP |
290 | Unit *u; |
291 | int r; | |
292 | ||
293 | assert(m); | |
294 | ||
295 | u = manager_get_unit(m, SPECIAL_ROOT_SLICE); | |
296 | if (!u) { | |
a581e45a | 297 | r = unit_new_for_name(m, sizeof(Slice), SPECIAL_ROOT_SLICE, &u); |
efdb0237 | 298 | if (r < 0) { |
a581e45a | 299 | log_error_errno(r, "Failed to allocate the special " SPECIAL_ROOT_SLICE " unit: %m"); |
ba64af90 | 300 | return; |
efdb0237 LP |
301 | } |
302 | } | |
303 | ||
f5869324 | 304 | u->perpetual = true; |
efdb0237 LP |
305 | SLICE(u)->deserialized_state = SLICE_ACTIVE; |
306 | ||
efdb0237 LP |
307 | unit_add_to_load_queue(u); |
308 | unit_add_to_dbus_queue(u); | |
efdb0237 LP |
309 | } |
310 | ||
a016b922 LP |
311 | const UnitVTable slice_vtable = { |
312 | .object_size = sizeof(Slice), | |
718db961 LP |
313 | .cgroup_context_offset = offsetof(Slice, cgroup_context), |
314 | ||
a016b922 LP |
315 | .sections = |
316 | "Unit\0" | |
317 | "Slice\0" | |
318 | "Install\0", | |
4ad49000 | 319 | .private_section = "Slice", |
4ad49000 | 320 | |
17f62e9b | 321 | .can_transient = true, |
a016b922 | 322 | |
1b4cd0cf | 323 | .init = slice_init, |
a016b922 | 324 | .load = slice_load, |
4ad49000 | 325 | |
a016b922 LP |
326 | .coldplug = slice_coldplug, |
327 | ||
328 | .dump = slice_dump, | |
329 | ||
330 | .start = slice_start, | |
331 | .stop = slice_stop, | |
332 | ||
333 | .kill = slice_kill, | |
334 | ||
335 | .serialize = slice_serialize, | |
336 | .deserialize_item = slice_deserialize_item, | |
337 | ||
338 | .active_state = slice_active_state, | |
339 | .sub_state_to_string = slice_sub_state_to_string, | |
340 | ||
718db961 | 341 | .bus_vtable = bus_slice_vtable, |
8e2af478 LP |
342 | .bus_set_property = bus_slice_set_property, |
343 | .bus_commit_properties = bus_slice_commit_properties, | |
a016b922 | 344 | |
efdb0237 LP |
345 | .enumerate = slice_enumerate, |
346 | ||
a016b922 LP |
347 | .status_message_formats = { |
348 | .finished_start_job = { | |
4ad49000 | 349 | [JOB_DONE] = "Created slice %s.", |
a016b922 LP |
350 | }, |
351 | .finished_stop_job = { | |
4ad49000 | 352 | [JOB_DONE] = "Removed slice %s.", |
a016b922 LP |
353 | }, |
354 | }, | |
355 | }; |