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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
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 | |
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 | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <errno.h> | |
14228c0d | 23 | |
14228c0d | 24 | #include "log.h" |
d9dfd233 | 25 | #include "strv.h" |
14228c0d MB |
26 | #include "special.h" |
27 | #include "unit-name.h" | |
d9dfd233 MP |
28 | #include "unit.h" |
29 | #include "slice.h" | |
30 | #include "dbus-slice.h" | |
14228c0d MB |
31 | |
32 | static const UnitActiveState state_translation_table[_SLICE_STATE_MAX] = { | |
33 | [SLICE_DEAD] = UNIT_INACTIVE, | |
34 | [SLICE_ACTIVE] = UNIT_ACTIVE | |
35 | }; | |
36 | ||
14228c0d MB |
37 | static void slice_set_state(Slice *t, SliceState state) { |
38 | SliceState old_state; | |
39 | assert(t); | |
40 | ||
41 | old_state = t->state; | |
42 | t->state = state; | |
43 | ||
44 | if (state != old_state) | |
45 | log_debug("%s changed %s -> %s", | |
46 | UNIT(t)->id, | |
47 | slice_state_to_string(old_state), | |
48 | slice_state_to_string(state)); | |
49 | ||
50 | unit_notify(UNIT(t), state_translation_table[old_state], state_translation_table[state], true); | |
51 | } | |
52 | ||
53 | static int slice_add_parent_slice(Slice *s) { | |
54 | char *a, *dash; | |
55 | Unit *parent; | |
56 | int r; | |
57 | ||
58 | assert(s); | |
59 | ||
60 | if (UNIT_ISSET(UNIT(s)->slice)) | |
61 | return 0; | |
62 | ||
63 | if (unit_has_name(UNIT(s), SPECIAL_ROOT_SLICE)) | |
64 | return 0; | |
65 | ||
66 | a = strdupa(UNIT(s)->id); | |
67 | dash = strrchr(a, '-'); | |
68 | if (dash) | |
69 | strcpy(dash, ".slice"); | |
70 | else | |
71 | a = (char*) SPECIAL_ROOT_SLICE; | |
72 | ||
73 | r = manager_load_unit(UNIT(s)->manager, a, NULL, NULL, &parent); | |
74 | if (r < 0) | |
75 | return r; | |
76 | ||
77 | unit_ref_set(&UNIT(s)->slice, parent); | |
78 | return 0; | |
79 | } | |
80 | ||
81 | static int slice_add_default_dependencies(Slice *s) { | |
82 | int r; | |
83 | ||
84 | assert(s); | |
85 | ||
86 | /* Make sure slices are unloaded on shutdown */ | |
87 | r = unit_add_two_dependencies_by_name( | |
88 | UNIT(s), | |
89 | UNIT_BEFORE, UNIT_CONFLICTS, | |
90 | SPECIAL_SHUTDOWN_TARGET, NULL, true); | |
91 | if (r < 0) | |
92 | return r; | |
93 | ||
94 | return 0; | |
95 | } | |
96 | ||
e3bff60a | 97 | |
14228c0d | 98 | static int slice_verify(Slice *s) { |
e3bff60a MP |
99 | _cleanup_free_ char *parent = NULL; |
100 | int r; | |
101 | ||
14228c0d MB |
102 | assert(s); |
103 | ||
104 | if (UNIT(s)->load_state != UNIT_LOADED) | |
105 | return 0; | |
106 | ||
e3bff60a MP |
107 | if (!slice_name_is_valid(UNIT(s)->id)) { |
108 | log_unit_error(UNIT(s), "Slice name %s is not valid. Refusing.", UNIT(s)->id); | |
109 | return -EINVAL; | |
110 | } | |
14228c0d | 111 | |
e3bff60a MP |
112 | r = slice_build_parent_slice(UNIT(s)->id, &parent); |
113 | if (r < 0) | |
114 | return log_unit_error_errno(UNIT(s), r, "Failed to determine parent slice: %m"); | |
14228c0d | 115 | |
e3bff60a MP |
116 | if (parent ? !unit_has_name(UNIT_DEREF(UNIT(s)->slice), parent) : UNIT_ISSET(UNIT(s)->slice)) { |
117 | log_unit_error(UNIT(s), "Located outside of parent slice. Refusing."); | |
118 | return -EINVAL; | |
14228c0d MB |
119 | } |
120 | ||
121 | return 0; | |
122 | } | |
123 | ||
124 | static int slice_load(Unit *u) { | |
125 | Slice *s = SLICE(u); | |
126 | int r; | |
127 | ||
128 | assert(s); | |
129 | ||
130 | r = unit_load_fragment_and_dropin_optional(u); | |
131 | if (r < 0) | |
132 | return r; | |
133 | ||
134 | /* This is a new unit? Then let's add in some extras */ | |
135 | if (u->load_state == UNIT_LOADED) { | |
136 | ||
60f067b4 JS |
137 | r = unit_patch_contexts(u); |
138 | if (r < 0) | |
139 | return r; | |
140 | ||
14228c0d MB |
141 | r = slice_add_parent_slice(s); |
142 | if (r < 0) | |
143 | return r; | |
144 | ||
145 | if (u->default_dependencies) { | |
146 | r = slice_add_default_dependencies(s); | |
147 | if (r < 0) | |
148 | return r; | |
149 | } | |
150 | } | |
151 | ||
152 | return slice_verify(s); | |
153 | } | |
154 | ||
155 | static int slice_coldplug(Unit *u) { | |
156 | Slice *t = SLICE(u); | |
157 | ||
158 | assert(t); | |
159 | assert(t->state == SLICE_DEAD); | |
160 | ||
161 | if (t->deserialized_state != t->state) | |
162 | slice_set_state(t, t->deserialized_state); | |
163 | ||
164 | return 0; | |
165 | } | |
166 | ||
167 | static void slice_dump(Unit *u, FILE *f, const char *prefix) { | |
168 | Slice *t = SLICE(u); | |
169 | ||
170 | assert(t); | |
171 | assert(f); | |
172 | ||
173 | fprintf(f, | |
174 | "%sSlice State: %s\n", | |
175 | prefix, slice_state_to_string(t->state)); | |
176 | ||
177 | cgroup_context_dump(&t->cgroup_context, f, prefix); | |
178 | } | |
179 | ||
180 | static int slice_start(Unit *u) { | |
181 | Slice *t = SLICE(u); | |
182 | ||
183 | assert(t); | |
184 | assert(t->state == SLICE_DEAD); | |
185 | ||
e3bff60a MP |
186 | (void) unit_realize_cgroup(u); |
187 | (void) unit_reset_cpu_usage(u); | |
14228c0d MB |
188 | |
189 | slice_set_state(t, SLICE_ACTIVE); | |
e735f4d4 | 190 | return 1; |
14228c0d MB |
191 | } |
192 | ||
193 | static int slice_stop(Unit *u) { | |
194 | Slice *t = SLICE(u); | |
195 | ||
196 | assert(t); | |
197 | assert(t->state == SLICE_ACTIVE); | |
198 | ||
199 | /* We do not need to destroy the cgroup explicitly, | |
200 | * unit_notify() will do that for us anyway. */ | |
201 | ||
202 | slice_set_state(t, SLICE_DEAD); | |
e735f4d4 | 203 | return 1; |
14228c0d MB |
204 | } |
205 | ||
60f067b4 | 206 | static int slice_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { |
14228c0d MB |
207 | return unit_kill_common(u, who, signo, -1, -1, error); |
208 | } | |
209 | ||
210 | static int slice_serialize(Unit *u, FILE *f, FDSet *fds) { | |
211 | Slice *s = SLICE(u); | |
212 | ||
213 | assert(s); | |
214 | assert(f); | |
215 | assert(fds); | |
216 | ||
217 | unit_serialize_item(u, f, "state", slice_state_to_string(s->state)); | |
218 | return 0; | |
219 | } | |
220 | ||
221 | static int slice_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
222 | Slice *s = SLICE(u); | |
223 | ||
224 | assert(u); | |
225 | assert(key); | |
226 | assert(value); | |
227 | assert(fds); | |
228 | ||
229 | if (streq(key, "state")) { | |
230 | SliceState state; | |
231 | ||
232 | state = slice_state_from_string(value); | |
233 | if (state < 0) | |
234 | log_debug("Failed to parse state value %s", value); | |
235 | else | |
236 | s->deserialized_state = state; | |
237 | ||
238 | } else | |
239 | log_debug("Unknown serialization key '%s'", key); | |
240 | ||
241 | return 0; | |
242 | } | |
243 | ||
244 | _pure_ static UnitActiveState slice_active_state(Unit *u) { | |
245 | assert(u); | |
246 | ||
247 | return state_translation_table[SLICE(u)->state]; | |
248 | } | |
249 | ||
250 | _pure_ static const char *slice_sub_state_to_string(Unit *u) { | |
251 | assert(u); | |
252 | ||
253 | return slice_state_to_string(SLICE(u)->state); | |
254 | } | |
255 | ||
d9dfd233 MP |
256 | static int slice_enumerate(Manager *m) { |
257 | Unit *u; | |
258 | int r; | |
259 | ||
260 | assert(m); | |
261 | ||
262 | u = manager_get_unit(m, SPECIAL_ROOT_SLICE); | |
263 | if (!u) { | |
264 | u = unit_new(m, sizeof(Slice)); | |
265 | if (!u) | |
266 | return log_oom(); | |
267 | ||
268 | r = unit_add_name(u, SPECIAL_ROOT_SLICE); | |
269 | if (r < 0) { | |
270 | unit_free(u); | |
271 | return log_error_errno(r, "Failed to add -.slice name"); | |
272 | } | |
273 | } | |
274 | ||
275 | u->default_dependencies = false; | |
276 | u->no_gc = true; | |
277 | SLICE(u)->deserialized_state = SLICE_ACTIVE; | |
278 | ||
279 | if (!u->description) | |
280 | u->description = strdup("Root Slice"); | |
281 | if (!u->documentation) | |
282 | (void) strv_extend(&u->documentation, "man:systemd.special(7)"); | |
283 | ||
284 | unit_add_to_load_queue(u); | |
285 | unit_add_to_dbus_queue(u); | |
286 | ||
287 | return 0; | |
288 | } | |
289 | ||
14228c0d MB |
290 | static const char* const slice_state_table[_SLICE_STATE_MAX] = { |
291 | [SLICE_DEAD] = "dead", | |
292 | [SLICE_ACTIVE] = "active" | |
293 | }; | |
294 | ||
295 | DEFINE_STRING_TABLE_LOOKUP(slice_state, SliceState); | |
296 | ||
297 | const UnitVTable slice_vtable = { | |
298 | .object_size = sizeof(Slice), | |
60f067b4 JS |
299 | .cgroup_context_offset = offsetof(Slice, cgroup_context), |
300 | ||
14228c0d MB |
301 | .sections = |
302 | "Unit\0" | |
303 | "Slice\0" | |
304 | "Install\0", | |
14228c0d | 305 | .private_section = "Slice", |
14228c0d MB |
306 | |
307 | .no_alias = true, | |
308 | .no_instances = true, | |
309 | ||
14228c0d | 310 | .load = slice_load, |
14228c0d MB |
311 | |
312 | .coldplug = slice_coldplug, | |
313 | ||
314 | .dump = slice_dump, | |
315 | ||
316 | .start = slice_start, | |
317 | .stop = slice_stop, | |
318 | ||
319 | .kill = slice_kill, | |
320 | ||
321 | .serialize = slice_serialize, | |
322 | .deserialize_item = slice_deserialize_item, | |
323 | ||
324 | .active_state = slice_active_state, | |
325 | .sub_state_to_string = slice_sub_state_to_string, | |
326 | ||
60f067b4 | 327 | .bus_vtable = bus_slice_vtable, |
14228c0d MB |
328 | .bus_set_property = bus_slice_set_property, |
329 | .bus_commit_properties = bus_slice_commit_properties, | |
330 | ||
d9dfd233 MP |
331 | .enumerate = slice_enumerate, |
332 | ||
14228c0d MB |
333 | .status_message_formats = { |
334 | .finished_start_job = { | |
335 | [JOB_DONE] = "Created slice %s.", | |
14228c0d MB |
336 | }, |
337 | .finished_stop_job = { | |
338 | [JOB_DONE] = "Removed slice %s.", | |
339 | }, | |
340 | }, | |
341 | }; |