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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 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 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 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <errno.h> | |
23 | #include <stdio.h> | |
24 | #include <mntent.h> | |
25 | #include <sys/epoll.h> | |
26 | #include <signal.h> | |
27 | ||
28 | #include "unit.h" | |
29 | #include "mount.h" | |
30 | #include "load-fragment.h" | |
31 | #include "load-dropin.h" | |
32 | #include "log.h" | |
33 | #include "strv.h" | |
34 | #include "mount-setup.h" | |
35 | #include "unit-name.h" | |
36 | #include "dbus-mount.h" | |
37 | #include "special.h" | |
38 | #include "bus-errors.h" | |
39 | #include "exit-status.h" | |
40 | ||
41 | static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = { | |
42 | [MOUNT_DEAD] = UNIT_INACTIVE, | |
43 | [MOUNT_MOUNTING] = UNIT_ACTIVATING, | |
44 | [MOUNT_MOUNTING_DONE] = UNIT_ACTIVE, | |
45 | [MOUNT_MOUNTED] = UNIT_ACTIVE, | |
46 | [MOUNT_REMOUNTING] = UNIT_RELOADING, | |
47 | [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING, | |
48 | [MOUNT_MOUNTING_SIGTERM] = UNIT_DEACTIVATING, | |
49 | [MOUNT_MOUNTING_SIGKILL] = UNIT_DEACTIVATING, | |
50 | [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING, | |
51 | [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING, | |
52 | [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING, | |
53 | [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING, | |
54 | [MOUNT_FAILED] = UNIT_FAILED | |
55 | }; | |
56 | ||
57 | static void mount_init(Unit *u) { | |
58 | Mount *m = MOUNT(u); | |
59 | ||
60 | assert(u); | |
61 | assert(u->meta.load_state == UNIT_STUB); | |
62 | ||
63 | m->timeout_usec = DEFAULT_TIMEOUT_USEC; | |
64 | m->directory_mode = 0755; | |
65 | ||
66 | exec_context_init(&m->exec_context); | |
67 | m->exec_context.std_output = EXEC_OUTPUT_KMSG; | |
68 | ||
69 | /* We need to make sure that /bin/mount is always called in | |
70 | * the same process group as us, so that the autofs kernel | |
71 | * side doesn't send us another mount request while we are | |
72 | * already trying to comply its last one. */ | |
73 | m->exec_context.same_pgrp = true; | |
74 | ||
75 | m->timer_watch.type = WATCH_INVALID; | |
76 | ||
77 | m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; | |
78 | } | |
79 | ||
80 | static void mount_unwatch_control_pid(Mount *m) { | |
81 | assert(m); | |
82 | ||
83 | if (m->control_pid <= 0) | |
84 | return; | |
85 | ||
86 | unit_unwatch_pid(UNIT(m), m->control_pid); | |
87 | m->control_pid = 0; | |
88 | } | |
89 | ||
90 | static void mount_parameters_done(MountParameters *p) { | |
91 | assert(p); | |
92 | ||
93 | free(p->what); | |
94 | free(p->options); | |
95 | free(p->fstype); | |
96 | ||
97 | p->what = p->options = p->fstype = NULL; | |
98 | } | |
99 | ||
100 | static void mount_done(Unit *u) { | |
101 | Mount *m = MOUNT(u); | |
102 | Meta *other; | |
103 | ||
104 | assert(m); | |
105 | ||
106 | free(m->where); | |
107 | m->where = NULL; | |
108 | ||
109 | /* Try to detach us from the automount unit if there is any */ | |
110 | LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_AUTOMOUNT]) { | |
111 | Automount *a = (Automount*) other; | |
112 | ||
113 | if (a->mount == m) | |
114 | a->mount = NULL; | |
115 | } | |
116 | ||
117 | mount_parameters_done(&m->parameters_etc_fstab); | |
118 | mount_parameters_done(&m->parameters_proc_self_mountinfo); | |
119 | mount_parameters_done(&m->parameters_fragment); | |
120 | ||
121 | exec_context_done(&m->exec_context); | |
122 | exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX); | |
123 | m->control_command = NULL; | |
124 | ||
125 | mount_unwatch_control_pid(m); | |
126 | ||
127 | unit_unwatch_timer(u, &m->timer_watch); | |
128 | } | |
129 | ||
130 | static int mount_add_mount_links(Mount *m) { | |
131 | Meta *other; | |
132 | int r; | |
133 | MountParameters *pm; | |
134 | ||
135 | assert(m); | |
136 | ||
137 | if (m->from_fragment) | |
138 | pm = &m->parameters_fragment; | |
139 | else if (m->from_etc_fstab) | |
140 | pm = &m->parameters_etc_fstab; | |
141 | else | |
142 | pm = NULL; | |
143 | ||
144 | /* Adds in links to other mount points that might lie below or | |
145 | * above us in the hierarchy */ | |
146 | ||
147 | LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_MOUNT]) { | |
148 | Mount *n = (Mount*) other; | |
149 | MountParameters *pn; | |
150 | ||
151 | if (n == m) | |
152 | continue; | |
153 | ||
154 | if (n->meta.load_state != UNIT_LOADED) | |
155 | continue; | |
156 | ||
157 | if (n->from_fragment) | |
158 | pn = &n->parameters_fragment; | |
159 | else if (n->from_etc_fstab) | |
160 | pn = &n->parameters_etc_fstab; | |
161 | else | |
162 | pn = NULL; | |
163 | ||
164 | if (path_startswith(m->where, n->where)) { | |
165 | ||
166 | if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0) | |
167 | return r; | |
168 | ||
169 | if (n->from_etc_fstab || n->from_fragment) | |
170 | if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0) | |
171 | return r; | |
172 | ||
173 | } else if (path_startswith(n->where, m->where)) { | |
174 | ||
175 | if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0) | |
176 | return r; | |
177 | ||
178 | if (m->from_etc_fstab || m->from_fragment) | |
179 | if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0) | |
180 | return r; | |
181 | ||
182 | } else if (pm && path_startswith(pm->what, n->where)) { | |
183 | ||
184 | if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0) | |
185 | return r; | |
186 | ||
187 | if (m->from_etc_fstab || m->from_fragment) | |
188 | if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0) | |
189 | return r; | |
190 | ||
191 | } else if (pn && path_startswith(pn->what, m->where)) { | |
192 | ||
193 | if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0) | |
194 | return r; | |
195 | ||
196 | if (n->from_etc_fstab || n->from_fragment) | |
197 | if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0) | |
198 | return r; | |
199 | } | |
200 | } | |
201 | ||
202 | return 0; | |
203 | } | |
204 | ||
205 | static int mount_add_swap_links(Mount *m) { | |
206 | Meta *other; | |
207 | int r; | |
208 | ||
209 | assert(m); | |
210 | ||
211 | LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_SWAP]) | |
212 | if ((r = swap_add_one_mount_link((Swap*) other, m)) < 0) | |
213 | return r; | |
214 | ||
215 | return 0; | |
216 | } | |
217 | ||
218 | static int mount_add_path_links(Mount *m) { | |
219 | Meta *other; | |
220 | int r; | |
221 | ||
222 | assert(m); | |
223 | ||
224 | LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_PATH]) | |
225 | if ((r = path_add_one_mount_link((Path*) other, m)) < 0) | |
226 | return r; | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
231 | static int mount_add_automount_links(Mount *m) { | |
232 | Meta *other; | |
233 | int r; | |
234 | ||
235 | assert(m); | |
236 | ||
237 | LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_AUTOMOUNT]) | |
238 | if ((r = automount_add_one_mount_link((Automount*) other, m)) < 0) | |
239 | return r; | |
240 | ||
241 | return 0; | |
242 | } | |
243 | ||
244 | static int mount_add_socket_links(Mount *m) { | |
245 | Meta *other; | |
246 | int r; | |
247 | ||
248 | assert(m); | |
249 | ||
250 | LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_SOCKET]) | |
251 | if ((r = socket_add_one_mount_link((Socket*) other, m)) < 0) | |
252 | return r; | |
253 | ||
254 | return 0; | |
255 | } | |
256 | ||
257 | static char* mount_test_option(const char *haystack, const char *needle) { | |
258 | struct mntent me; | |
259 | ||
260 | assert(needle); | |
261 | ||
262 | /* Like glibc's hasmntopt(), but works on a string, not a | |
263 | * struct mntent */ | |
264 | ||
265 | if (!haystack) | |
266 | return false; | |
267 | ||
268 | zero(me); | |
269 | me.mnt_opts = (char*) haystack; | |
270 | ||
271 | return hasmntopt(&me, needle); | |
272 | } | |
273 | ||
274 | static int mount_add_target_links(Mount *m) { | |
275 | const char *target, *after = NULL; | |
276 | MountParameters *p; | |
277 | Unit *tu; | |
278 | int r; | |
279 | bool noauto, nofail, handle, automount; | |
280 | ||
281 | assert(m); | |
282 | ||
283 | if (m->from_fragment) | |
284 | p = &m->parameters_fragment; | |
285 | else if (m->from_etc_fstab) | |
286 | p = &m->parameters_etc_fstab; | |
287 | else | |
288 | return 0; | |
289 | ||
290 | noauto = !!mount_test_option(p->options, MNTOPT_NOAUTO); | |
291 | nofail = !!mount_test_option(p->options, "nofail"); | |
292 | handle = !!mount_test_option(p->options, "comment=systemd.mount") || | |
293 | m->meta.manager->mount_auto; | |
294 | automount = !!mount_test_option(p->options, "comment=systemd.automount"); | |
295 | ||
296 | if (mount_test_option(p->options, "_netdev") || | |
297 | (p->fstype && fstype_is_network(p->fstype))) { | |
298 | target = SPECIAL_REMOTE_FS_TARGET; | |
299 | ||
300 | if (m->meta.manager->running_as == MANAGER_SYSTEM) | |
301 | after = SPECIAL_NETWORK_TARGET; | |
302 | } else | |
303 | target = SPECIAL_LOCAL_FS_TARGET; | |
304 | ||
305 | if ((r = manager_load_unit(m->meta.manager, target, NULL, NULL, &tu)) < 0) | |
306 | return r; | |
307 | ||
308 | if (after) | |
309 | if ((r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, NULL, true)) < 0) | |
310 | return r; | |
311 | ||
312 | if (automount && m->meta.manager->running_as == MANAGER_SYSTEM) { | |
313 | Unit *am; | |
314 | ||
315 | if ((r = unit_load_related_unit(UNIT(m), ".automount", &am)) < 0) | |
316 | return r; | |
317 | ||
318 | return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_WANTS, UNIT(am), true); | |
319 | } else { | |
320 | ||
321 | /* Automatically add mount points that aren't natively | |
322 | * configured to local-fs.target */ | |
323 | if (!noauto && | |
324 | !nofail && | |
325 | handle && | |
326 | m->from_etc_fstab && | |
327 | m->meta.manager->running_as == MANAGER_SYSTEM) | |
328 | if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true)) < 0) | |
329 | return r; | |
330 | ||
331 | return unit_add_dependency(UNIT(m), UNIT_BEFORE, tu, true); | |
332 | } | |
333 | } | |
334 | ||
335 | static bool mount_is_bind(MountParameters *p) { | |
336 | assert(p); | |
337 | ||
338 | if (p->fstype && streq(p->fstype, "bind")) | |
339 | return true; | |
340 | ||
341 | if (mount_test_option(p->options, "bind")) | |
342 | return true; | |
343 | ||
344 | return false; | |
345 | } | |
346 | ||
347 | static int mount_add_device_links(Mount *m) { | |
348 | MountParameters *p; | |
349 | int r; | |
350 | ||
351 | assert(m); | |
352 | ||
353 | if (m->from_fragment) | |
354 | p = &m->parameters_fragment; | |
355 | else if (m->from_etc_fstab) | |
356 | p = &m->parameters_etc_fstab; | |
357 | else | |
358 | return 0; | |
359 | ||
360 | if (!p->what) | |
361 | return 0; | |
362 | ||
363 | if (!mount_is_bind(p) && !path_equal(m->where, "/")) { | |
364 | bool nofail, noauto; | |
365 | ||
366 | noauto = !!mount_test_option(p->options, MNTOPT_NOAUTO); | |
367 | nofail = !!mount_test_option(p->options, "nofail"); | |
368 | ||
369 | if ((r = unit_add_node_link(UNIT(m), p->what, | |
370 | !noauto && nofail && | |
371 | UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM)) < 0) | |
372 | return r; | |
373 | } | |
374 | ||
375 | if (p->passno > 0 && | |
376 | !mount_is_bind(p) && | |
377 | UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM && | |
378 | !path_equal(m->where, "/")) { | |
379 | char *name; | |
380 | Unit *fsck; | |
381 | /* Let's add in the fsck service */ | |
382 | ||
383 | /* aka SPECIAL_FSCK_SERVICE */ | |
384 | if (!(name = unit_name_from_path_instance("fsck", p->what, ".service"))) | |
385 | return -ENOMEM; | |
386 | ||
387 | if ((r = manager_load_unit_prepare(m->meta.manager, name, NULL, NULL, &fsck)) < 0) { | |
388 | log_warning("Failed to prepare unit %s: %s", name, strerror(-r)); | |
389 | free(name); | |
390 | return r; | |
391 | } | |
392 | ||
393 | free(name); | |
394 | ||
395 | SERVICE(fsck)->fsck_passno = p->passno; | |
396 | ||
397 | if ((r = unit_add_two_dependencies(UNIT(m), UNIT_AFTER, UNIT_REQUIRES, fsck, true)) < 0) | |
398 | return r; | |
399 | } | |
400 | ||
401 | return 0; | |
402 | } | |
403 | ||
404 | static int mount_add_default_dependencies(Mount *m) { | |
405 | int r; | |
406 | ||
407 | assert(m); | |
408 | ||
409 | if (m->meta.manager->running_as == MANAGER_SYSTEM && | |
410 | !path_equal(m->where, "/")) { | |
411 | ||
412 | if ((r = unit_add_dependency_by_name(UNIT(m), UNIT_BEFORE, SPECIAL_QUOTACHECK_SERVICE, NULL, true)) < 0) | |
413 | return r; | |
414 | ||
415 | if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0) | |
416 | return r; | |
417 | } | |
418 | ||
419 | return 0; | |
420 | } | |
421 | ||
422 | static int mount_verify(Mount *m) { | |
423 | bool b; | |
424 | char *e; | |
425 | assert(m); | |
426 | ||
427 | if (m->meta.load_state != UNIT_LOADED) | |
428 | return 0; | |
429 | ||
430 | if (!m->from_etc_fstab && !m->from_fragment && !m->from_proc_self_mountinfo) | |
431 | return -ENOENT; | |
432 | ||
433 | if (!(e = unit_name_from_path(m->where, ".mount"))) | |
434 | return -ENOMEM; | |
435 | ||
436 | b = unit_has_name(UNIT(m), e); | |
437 | free(e); | |
438 | ||
439 | if (!b) { | |
440 | log_error("%s's Where setting doesn't match unit name. Refusing.", m->meta.id); | |
441 | return -EINVAL; | |
442 | } | |
443 | ||
444 | if (m->meta.fragment_path && !m->parameters_fragment.what) { | |
445 | log_error("%s's What setting is missing. Refusing.", m->meta.id); | |
446 | return -EBADMSG; | |
447 | } | |
448 | ||
449 | if (m->exec_context.pam_name && m->exec_context.kill_mode != KILL_CONTROL_GROUP) { | |
450 | log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", m->meta.id); | |
451 | return -EINVAL; | |
452 | } | |
453 | ||
454 | return 0; | |
455 | } | |
456 | ||
457 | static int mount_load(Unit *u) { | |
458 | Mount *m = MOUNT(u); | |
459 | int r; | |
460 | ||
461 | assert(u); | |
462 | assert(u->meta.load_state == UNIT_STUB); | |
463 | ||
464 | if ((r = unit_load_fragment_and_dropin_optional(u)) < 0) | |
465 | return r; | |
466 | ||
467 | /* This is a new unit? Then let's add in some extras */ | |
468 | if (u->meta.load_state == UNIT_LOADED) { | |
469 | if ((r = unit_add_exec_dependencies(u, &m->exec_context)) < 0) | |
470 | return r; | |
471 | ||
472 | if (m->meta.fragment_path) | |
473 | m->from_fragment = true; | |
474 | ||
475 | if (!m->where) | |
476 | if (!(m->where = unit_name_to_path(u->meta.id))) | |
477 | return -ENOMEM; | |
478 | ||
479 | path_kill_slashes(m->where); | |
480 | ||
481 | if (!m->meta.description) | |
482 | if ((r = unit_set_description(u, m->where)) < 0) | |
483 | return r; | |
484 | ||
485 | if ((r = mount_add_device_links(m)) < 0) | |
486 | return r; | |
487 | ||
488 | if ((r = mount_add_mount_links(m)) < 0) | |
489 | return r; | |
490 | ||
491 | if ((r = mount_add_socket_links(m)) < 0) | |
492 | return r; | |
493 | ||
494 | if ((r = mount_add_swap_links(m)) < 0) | |
495 | return r; | |
496 | ||
497 | if ((r = mount_add_path_links(m)) < 0) | |
498 | return r; | |
499 | ||
500 | if ((r = mount_add_automount_links(m)) < 0) | |
501 | return r; | |
502 | ||
503 | if ((r = mount_add_target_links(m)) < 0) | |
504 | return r; | |
505 | ||
506 | if ((r = unit_add_default_cgroups(u)) < 0) | |
507 | return r; | |
508 | ||
509 | if (m->meta.default_dependencies) | |
510 | if ((r = mount_add_default_dependencies(m)) < 0) | |
511 | return r; | |
512 | } | |
513 | ||
514 | return mount_verify(m); | |
515 | } | |
516 | ||
517 | static int mount_notify_automount(Mount *m, int status) { | |
518 | Unit *p; | |
519 | int r; | |
520 | ||
521 | assert(m); | |
522 | ||
523 | if ((r = unit_get_related_unit(UNIT(m), ".automount", &p)) < 0) | |
524 | return r == -ENOENT ? 0 : r; | |
525 | ||
526 | return automount_send_ready(AUTOMOUNT(p), status); | |
527 | } | |
528 | ||
529 | static void mount_set_state(Mount *m, MountState state) { | |
530 | MountState old_state; | |
531 | assert(m); | |
532 | ||
533 | old_state = m->state; | |
534 | m->state = state; | |
535 | ||
536 | if (state != MOUNT_MOUNTING && | |
537 | state != MOUNT_MOUNTING_DONE && | |
538 | state != MOUNT_REMOUNTING && | |
539 | state != MOUNT_UNMOUNTING && | |
540 | state != MOUNT_MOUNTING_SIGTERM && | |
541 | state != MOUNT_MOUNTING_SIGKILL && | |
542 | state != MOUNT_UNMOUNTING_SIGTERM && | |
543 | state != MOUNT_UNMOUNTING_SIGKILL && | |
544 | state != MOUNT_REMOUNTING_SIGTERM && | |
545 | state != MOUNT_REMOUNTING_SIGKILL) { | |
546 | unit_unwatch_timer(UNIT(m), &m->timer_watch); | |
547 | mount_unwatch_control_pid(m); | |
548 | m->control_command = NULL; | |
549 | m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; | |
550 | } | |
551 | ||
552 | if (state == MOUNT_MOUNTED || | |
553 | state == MOUNT_REMOUNTING) | |
554 | mount_notify_automount(m, 0); | |
555 | else if (state == MOUNT_DEAD || | |
556 | state == MOUNT_UNMOUNTING || | |
557 | state == MOUNT_MOUNTING_SIGTERM || | |
558 | state == MOUNT_MOUNTING_SIGKILL || | |
559 | state == MOUNT_REMOUNTING_SIGTERM || | |
560 | state == MOUNT_REMOUNTING_SIGKILL || | |
561 | state == MOUNT_UNMOUNTING_SIGTERM || | |
562 | state == MOUNT_UNMOUNTING_SIGKILL || | |
563 | state == MOUNT_FAILED) | |
564 | mount_notify_automount(m, -ENODEV); | |
565 | ||
566 | if (state != old_state) | |
567 | log_debug("%s changed %s -> %s", | |
568 | m->meta.id, | |
569 | mount_state_to_string(old_state), | |
570 | mount_state_to_string(state)); | |
571 | ||
572 | unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state], !m->reload_failure); | |
573 | m->reload_failure = false; | |
574 | } | |
575 | ||
576 | static int mount_coldplug(Unit *u) { | |
577 | Mount *m = MOUNT(u); | |
578 | MountState new_state = MOUNT_DEAD; | |
579 | int r; | |
580 | ||
581 | assert(m); | |
582 | assert(m->state == MOUNT_DEAD); | |
583 | ||
584 | if (m->deserialized_state != m->state) | |
585 | new_state = m->deserialized_state; | |
586 | else if (m->from_proc_self_mountinfo) | |
587 | new_state = MOUNT_MOUNTED; | |
588 | ||
589 | if (new_state != m->state) { | |
590 | ||
591 | if (new_state == MOUNT_MOUNTING || | |
592 | new_state == MOUNT_MOUNTING_DONE || | |
593 | new_state == MOUNT_REMOUNTING || | |
594 | new_state == MOUNT_UNMOUNTING || | |
595 | new_state == MOUNT_MOUNTING_SIGTERM || | |
596 | new_state == MOUNT_MOUNTING_SIGKILL || | |
597 | new_state == MOUNT_UNMOUNTING_SIGTERM || | |
598 | new_state == MOUNT_UNMOUNTING_SIGKILL || | |
599 | new_state == MOUNT_REMOUNTING_SIGTERM || | |
600 | new_state == MOUNT_REMOUNTING_SIGKILL) { | |
601 | ||
602 | if (m->control_pid <= 0) | |
603 | return -EBADMSG; | |
604 | ||
605 | if ((r = unit_watch_pid(UNIT(m), m->control_pid)) < 0) | |
606 | return r; | |
607 | ||
608 | if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0) | |
609 | return r; | |
610 | } | |
611 | ||
612 | mount_set_state(m, new_state); | |
613 | } | |
614 | ||
615 | return 0; | |
616 | } | |
617 | ||
618 | static void mount_dump(Unit *u, FILE *f, const char *prefix) { | |
619 | Mount *m = MOUNT(u); | |
620 | MountParameters *p; | |
621 | ||
622 | assert(m); | |
623 | assert(f); | |
624 | ||
625 | if (m->from_proc_self_mountinfo) | |
626 | p = &m->parameters_proc_self_mountinfo; | |
627 | else if (m->from_fragment) | |
628 | p = &m->parameters_fragment; | |
629 | else | |
630 | p = &m->parameters_etc_fstab; | |
631 | ||
632 | fprintf(f, | |
633 | "%sMount State: %s\n" | |
634 | "%sWhere: %s\n" | |
635 | "%sWhat: %s\n" | |
636 | "%sFile System Type: %s\n" | |
637 | "%sOptions: %s\n" | |
638 | "%sFrom /etc/fstab: %s\n" | |
639 | "%sFrom /proc/self/mountinfo: %s\n" | |
640 | "%sFrom fragment: %s\n" | |
641 | "%sDirectoryMode: %04o\n", | |
642 | prefix, mount_state_to_string(m->state), | |
643 | prefix, m->where, | |
644 | prefix, strna(p->what), | |
645 | prefix, strna(p->fstype), | |
646 | prefix, strna(p->options), | |
647 | prefix, yes_no(m->from_etc_fstab), | |
648 | prefix, yes_no(m->from_proc_self_mountinfo), | |
649 | prefix, yes_no(m->from_fragment), | |
650 | prefix, m->directory_mode); | |
651 | ||
652 | if (m->control_pid > 0) | |
653 | fprintf(f, | |
654 | "%sControl PID: %lu\n", | |
655 | prefix, (unsigned long) m->control_pid); | |
656 | ||
657 | exec_context_dump(&m->exec_context, f, prefix); | |
658 | } | |
659 | ||
660 | static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) { | |
661 | pid_t pid; | |
662 | int r; | |
663 | ||
664 | assert(m); | |
665 | assert(c); | |
666 | assert(_pid); | |
667 | ||
668 | if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0) | |
669 | goto fail; | |
670 | ||
671 | if ((r = exec_spawn(c, | |
672 | NULL, | |
673 | &m->exec_context, | |
674 | NULL, 0, | |
675 | m->meta.manager->environment, | |
676 | true, | |
677 | true, | |
678 | true, | |
679 | m->meta.manager->confirm_spawn, | |
680 | m->meta.cgroup_bondings, | |
681 | &pid)) < 0) | |
682 | goto fail; | |
683 | ||
684 | if ((r = unit_watch_pid(UNIT(m), pid)) < 0) | |
685 | /* FIXME: we need to do something here */ | |
686 | goto fail; | |
687 | ||
688 | *_pid = pid; | |
689 | ||
690 | return 0; | |
691 | ||
692 | fail: | |
693 | unit_unwatch_timer(UNIT(m), &m->timer_watch); | |
694 | ||
695 | return r; | |
696 | } | |
697 | ||
698 | static void mount_enter_dead(Mount *m, bool success) { | |
699 | assert(m); | |
700 | ||
701 | if (!success) | |
702 | m->failure = true; | |
703 | ||
704 | mount_set_state(m, m->failure ? MOUNT_FAILED : MOUNT_DEAD); | |
705 | } | |
706 | ||
707 | static void mount_enter_mounted(Mount *m, bool success) { | |
708 | assert(m); | |
709 | ||
710 | if (!success) | |
711 | m->failure = true; | |
712 | ||
713 | mount_set_state(m, MOUNT_MOUNTED); | |
714 | } | |
715 | ||
716 | static void mount_enter_signal(Mount *m, MountState state, bool success) { | |
717 | int r; | |
718 | Set *pid_set = NULL; | |
719 | bool wait_for_exit = false; | |
720 | ||
721 | assert(m); | |
722 | ||
723 | if (!success) | |
724 | m->failure = true; | |
725 | ||
726 | if (m->exec_context.kill_mode != KILL_NONE) { | |
727 | int sig = (state == MOUNT_MOUNTING_SIGTERM || | |
728 | state == MOUNT_UNMOUNTING_SIGTERM || | |
729 | state == MOUNT_REMOUNTING_SIGTERM) ? m->exec_context.kill_signal : SIGKILL; | |
730 | ||
731 | if (m->control_pid > 0) { | |
732 | if (kill_and_sigcont(m->exec_context.kill_mode == KILL_PROCESS_GROUP ? | |
733 | -m->control_pid : | |
734 | m->control_pid, sig) < 0 && errno != ESRCH) | |
735 | ||
736 | log_warning("Failed to kill control process %li: %m", (long) m->control_pid); | |
737 | else | |
738 | wait_for_exit = true; | |
739 | } | |
740 | ||
741 | if (m->exec_context.kill_mode == KILL_CONTROL_GROUP) { | |
742 | ||
743 | if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) { | |
744 | r = -ENOMEM; | |
745 | goto fail; | |
746 | } | |
747 | ||
748 | /* Exclude the control pid from being killed via the cgroup */ | |
749 | if (m->control_pid > 0) | |
750 | if ((r = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0) | |
751 | goto fail; | |
752 | ||
753 | if ((r = cgroup_bonding_kill_list(m->meta.cgroup_bondings, sig, true, pid_set)) < 0) { | |
754 | if (r != -EAGAIN && r != -ESRCH && r != -ENOENT) | |
755 | log_warning("Failed to kill control group: %s", strerror(-r)); | |
756 | } else if (r > 0) | |
757 | wait_for_exit = true; | |
758 | ||
759 | set_free(pid_set); | |
760 | } | |
761 | } | |
762 | ||
763 | if (wait_for_exit) { | |
764 | if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0) | |
765 | goto fail; | |
766 | ||
767 | mount_set_state(m, state); | |
768 | } else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL) | |
769 | mount_enter_mounted(m, true); | |
770 | else | |
771 | mount_enter_dead(m, true); | |
772 | ||
773 | return; | |
774 | ||
775 | fail: | |
776 | log_warning("%s failed to kill processes: %s", m->meta.id, strerror(-r)); | |
777 | ||
778 | if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL) | |
779 | mount_enter_mounted(m, false); | |
780 | else | |
781 | mount_enter_dead(m, false); | |
782 | ||
783 | if (pid_set) | |
784 | set_free(pid_set); | |
785 | } | |
786 | ||
787 | static void mount_enter_unmounting(Mount *m, bool success) { | |
788 | int r; | |
789 | ||
790 | assert(m); | |
791 | ||
792 | if (!success) | |
793 | m->failure = true; | |
794 | ||
795 | m->control_command_id = MOUNT_EXEC_UNMOUNT; | |
796 | m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT; | |
797 | ||
798 | if ((r = exec_command_set( | |
799 | m->control_command, | |
800 | "/bin/umount", | |
801 | m->where, | |
802 | NULL)) < 0) | |
803 | goto fail; | |
804 | ||
805 | mount_unwatch_control_pid(m); | |
806 | ||
807 | if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0) | |
808 | goto fail; | |
809 | ||
810 | mount_set_state(m, MOUNT_UNMOUNTING); | |
811 | ||
812 | return; | |
813 | ||
814 | fail: | |
815 | log_warning("%s failed to run 'umount' task: %s", m->meta.id, strerror(-r)); | |
816 | mount_enter_mounted(m, false); | |
817 | } | |
818 | ||
819 | static void mount_enter_mounting(Mount *m) { | |
820 | int r; | |
821 | ||
822 | assert(m); | |
823 | ||
824 | m->control_command_id = MOUNT_EXEC_MOUNT; | |
825 | m->control_command = m->exec_command + MOUNT_EXEC_MOUNT; | |
826 | ||
827 | mkdir_p(m->where, m->directory_mode); | |
828 | ||
829 | if (m->from_fragment) | |
830 | r = exec_command_set( | |
831 | m->control_command, | |
832 | "/bin/mount", | |
833 | m->parameters_fragment.what, | |
834 | m->where, | |
835 | "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto", | |
836 | m->parameters_fragment.options ? "-o" : NULL, m->parameters_fragment.options, | |
837 | NULL); | |
838 | else if (m->from_etc_fstab) | |
839 | r = exec_command_set( | |
840 | m->control_command, | |
841 | "/bin/mount", | |
842 | m->where, | |
843 | NULL); | |
844 | else | |
845 | r = -ENOENT; | |
846 | ||
847 | if (r < 0) | |
848 | goto fail; | |
849 | ||
850 | mount_unwatch_control_pid(m); | |
851 | ||
852 | if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0) | |
853 | goto fail; | |
854 | ||
855 | mount_set_state(m, MOUNT_MOUNTING); | |
856 | ||
857 | return; | |
858 | ||
859 | fail: | |
860 | log_warning("%s failed to run 'mount' task: %s", m->meta.id, strerror(-r)); | |
861 | mount_enter_dead(m, false); | |
862 | } | |
863 | ||
864 | static void mount_enter_mounting_done(Mount *m) { | |
865 | assert(m); | |
866 | ||
867 | mount_set_state(m, MOUNT_MOUNTING_DONE); | |
868 | } | |
869 | ||
870 | static void mount_enter_remounting(Mount *m, bool success) { | |
871 | int r; | |
872 | ||
873 | assert(m); | |
874 | ||
875 | if (!success) | |
876 | m->failure = true; | |
877 | ||
878 | m->control_command_id = MOUNT_EXEC_REMOUNT; | |
879 | m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT; | |
880 | ||
881 | if (m->from_fragment) { | |
882 | char *buf = NULL; | |
883 | const char *o; | |
884 | ||
885 | if (m->parameters_fragment.options) { | |
886 | if (!(buf = strappend("remount,", m->parameters_fragment.options))) { | |
887 | r = -ENOMEM; | |
888 | goto fail; | |
889 | } | |
890 | ||
891 | o = buf; | |
892 | } else | |
893 | o = "remount"; | |
894 | ||
895 | r = exec_command_set( | |
896 | m->control_command, | |
897 | "/bin/mount", | |
898 | m->parameters_fragment.what, | |
899 | m->where, | |
900 | "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto", | |
901 | "-o", o, | |
902 | NULL); | |
903 | ||
904 | free(buf); | |
905 | } else if (m->from_etc_fstab) | |
906 | r = exec_command_set( | |
907 | m->control_command, | |
908 | "/bin/mount", | |
909 | m->where, | |
910 | "-o", "remount", | |
911 | NULL); | |
912 | else | |
913 | r = -ENOENT; | |
914 | ||
915 | if (r < 0) | |
916 | goto fail; | |
917 | ||
918 | mount_unwatch_control_pid(m); | |
919 | ||
920 | if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0) | |
921 | goto fail; | |
922 | ||
923 | mount_set_state(m, MOUNT_REMOUNTING); | |
924 | ||
925 | return; | |
926 | ||
927 | fail: | |
928 | log_warning("%s failed to run 'remount' task: %s", m->meta.id, strerror(-r)); | |
929 | m->reload_failure = true; | |
930 | mount_enter_mounted(m, true); | |
931 | } | |
932 | ||
933 | static int mount_start(Unit *u) { | |
934 | Mount *m = MOUNT(u); | |
935 | ||
936 | assert(m); | |
937 | ||
938 | /* We cannot fulfill this request right now, try again later | |
939 | * please! */ | |
940 | if (m->state == MOUNT_UNMOUNTING || | |
941 | m->state == MOUNT_UNMOUNTING_SIGTERM || | |
942 | m->state == MOUNT_UNMOUNTING_SIGKILL || | |
943 | m->state == MOUNT_MOUNTING_SIGTERM || | |
944 | m->state == MOUNT_MOUNTING_SIGKILL) | |
945 | return -EAGAIN; | |
946 | ||
947 | /* Already on it! */ | |
948 | if (m->state == MOUNT_MOUNTING) | |
949 | return 0; | |
950 | ||
951 | assert(m->state == MOUNT_DEAD || m->state == MOUNT_FAILED); | |
952 | ||
953 | m->failure = false; | |
954 | mount_enter_mounting(m); | |
955 | return 0; | |
956 | } | |
957 | ||
958 | static int mount_stop(Unit *u) { | |
959 | Mount *m = MOUNT(u); | |
960 | ||
961 | assert(m); | |
962 | ||
963 | /* Already on it */ | |
964 | if (m->state == MOUNT_UNMOUNTING || | |
965 | m->state == MOUNT_UNMOUNTING_SIGKILL || | |
966 | m->state == MOUNT_UNMOUNTING_SIGTERM || | |
967 | m->state == MOUNT_MOUNTING_SIGTERM || | |
968 | m->state == MOUNT_MOUNTING_SIGKILL) | |
969 | return 0; | |
970 | ||
971 | assert(m->state == MOUNT_MOUNTING || | |
972 | m->state == MOUNT_MOUNTING_DONE || | |
973 | m->state == MOUNT_MOUNTED || | |
974 | m->state == MOUNT_REMOUNTING || | |
975 | m->state == MOUNT_REMOUNTING_SIGTERM || | |
976 | m->state == MOUNT_REMOUNTING_SIGKILL); | |
977 | ||
978 | mount_enter_unmounting(m, true); | |
979 | return 0; | |
980 | } | |
981 | ||
982 | static int mount_reload(Unit *u) { | |
983 | Mount *m = MOUNT(u); | |
984 | ||
985 | assert(m); | |
986 | ||
987 | if (m->state == MOUNT_MOUNTING_DONE) | |
988 | return -EAGAIN; | |
989 | ||
990 | assert(m->state == MOUNT_MOUNTED); | |
991 | ||
992 | mount_enter_remounting(m, true); | |
993 | return 0; | |
994 | } | |
995 | ||
996 | static int mount_serialize(Unit *u, FILE *f, FDSet *fds) { | |
997 | Mount *m = MOUNT(u); | |
998 | ||
999 | assert(m); | |
1000 | assert(f); | |
1001 | assert(fds); | |
1002 | ||
1003 | unit_serialize_item(u, f, "state", mount_state_to_string(m->state)); | |
1004 | unit_serialize_item(u, f, "failure", yes_no(m->failure)); | |
1005 | ||
1006 | if (m->control_pid > 0) | |
1007 | unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) m->control_pid); | |
1008 | ||
1009 | if (m->control_command_id >= 0) | |
1010 | unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id)); | |
1011 | ||
1012 | return 0; | |
1013 | } | |
1014 | ||
1015 | static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
1016 | Mount *m = MOUNT(u); | |
1017 | ||
1018 | assert(u); | |
1019 | assert(key); | |
1020 | assert(value); | |
1021 | assert(fds); | |
1022 | ||
1023 | if (streq(key, "state")) { | |
1024 | MountState state; | |
1025 | ||
1026 | if ((state = mount_state_from_string(value)) < 0) | |
1027 | log_debug("Failed to parse state value %s", value); | |
1028 | else | |
1029 | m->deserialized_state = state; | |
1030 | } else if (streq(key, "failure")) { | |
1031 | int b; | |
1032 | ||
1033 | if ((b = parse_boolean(value)) < 0) | |
1034 | log_debug("Failed to parse failure value %s", value); | |
1035 | else | |
1036 | m->failure = b || m->failure; | |
1037 | ||
1038 | } else if (streq(key, "control-pid")) { | |
1039 | pid_t pid; | |
1040 | ||
1041 | if (parse_pid(value, &pid) < 0) | |
1042 | log_debug("Failed to parse control-pid value %s", value); | |
1043 | else | |
1044 | m->control_pid = pid; | |
1045 | } else if (streq(key, "control-command")) { | |
1046 | MountExecCommand id; | |
1047 | ||
1048 | if ((id = mount_exec_command_from_string(value)) < 0) | |
1049 | log_debug("Failed to parse exec-command value %s", value); | |
1050 | else { | |
1051 | m->control_command_id = id; | |
1052 | m->control_command = m->exec_command + id; | |
1053 | } | |
1054 | ||
1055 | } else | |
1056 | log_debug("Unknown serialization key '%s'", key); | |
1057 | ||
1058 | return 0; | |
1059 | } | |
1060 | ||
1061 | static UnitActiveState mount_active_state(Unit *u) { | |
1062 | assert(u); | |
1063 | ||
1064 | return state_translation_table[MOUNT(u)->state]; | |
1065 | } | |
1066 | ||
1067 | static const char *mount_sub_state_to_string(Unit *u) { | |
1068 | assert(u); | |
1069 | ||
1070 | return mount_state_to_string(MOUNT(u)->state); | |
1071 | } | |
1072 | ||
1073 | static bool mount_check_gc(Unit *u) { | |
1074 | Mount *m = MOUNT(u); | |
1075 | ||
1076 | assert(m); | |
1077 | ||
1078 | return m->from_etc_fstab || m->from_proc_self_mountinfo; | |
1079 | } | |
1080 | ||
1081 | static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) { | |
1082 | Mount *m = MOUNT(u); | |
1083 | bool success; | |
1084 | ||
1085 | assert(m); | |
1086 | assert(pid >= 0); | |
1087 | ||
1088 | if (pid != m->control_pid) | |
1089 | return; | |
1090 | ||
1091 | m->control_pid = 0; | |
1092 | ||
1093 | success = is_clean_exit(code, status); | |
1094 | m->failure = m->failure || !success; | |
1095 | ||
1096 | if (m->control_command) { | |
1097 | exec_status_exit(&m->control_command->exec_status, pid, code, status, m->exec_context.utmp_id); | |
1098 | m->control_command = NULL; | |
1099 | m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; | |
1100 | } | |
1101 | ||
1102 | log_full(success ? LOG_DEBUG : LOG_NOTICE, | |
1103 | "%s mount process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status); | |
1104 | ||
1105 | /* Note that mount(8) returning and the kernel sending us a | |
1106 | * mount table change event might happen out-of-order. If an | |
1107 | * operation succeed we assume the kernel will follow soon too | |
1108 | * and already change into the resulting state. If it fails | |
1109 | * we check if the kernel still knows about the mount. and | |
1110 | * change state accordingly. */ | |
1111 | ||
1112 | switch (m->state) { | |
1113 | ||
1114 | case MOUNT_MOUNTING: | |
1115 | case MOUNT_MOUNTING_DONE: | |
1116 | case MOUNT_MOUNTING_SIGKILL: | |
1117 | case MOUNT_MOUNTING_SIGTERM: | |
1118 | ||
1119 | if (success) | |
1120 | mount_enter_mounted(m, true); | |
1121 | else if (m->from_proc_self_mountinfo) | |
1122 | mount_enter_mounted(m, false); | |
1123 | else | |
1124 | mount_enter_dead(m, false); | |
1125 | break; | |
1126 | ||
1127 | case MOUNT_REMOUNTING: | |
1128 | case MOUNT_REMOUNTING_SIGKILL: | |
1129 | case MOUNT_REMOUNTING_SIGTERM: | |
1130 | ||
1131 | m->reload_failure = !success; | |
1132 | if (m->from_proc_self_mountinfo) | |
1133 | mount_enter_mounted(m, true); | |
1134 | else | |
1135 | mount_enter_dead(m, true); | |
1136 | ||
1137 | break; | |
1138 | ||
1139 | case MOUNT_UNMOUNTING: | |
1140 | case MOUNT_UNMOUNTING_SIGKILL: | |
1141 | case MOUNT_UNMOUNTING_SIGTERM: | |
1142 | ||
1143 | if (success) | |
1144 | mount_enter_dead(m, true); | |
1145 | else if (m->from_proc_self_mountinfo) | |
1146 | mount_enter_mounted(m, false); | |
1147 | else | |
1148 | mount_enter_dead(m, false); | |
1149 | break; | |
1150 | ||
1151 | default: | |
1152 | assert_not_reached("Uh, control process died at wrong time."); | |
1153 | } | |
1154 | ||
1155 | /* Notify clients about changed exit status */ | |
1156 | unit_add_to_dbus_queue(u); | |
1157 | } | |
1158 | ||
1159 | static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) { | |
1160 | Mount *m = MOUNT(u); | |
1161 | ||
1162 | assert(m); | |
1163 | assert(elapsed == 1); | |
1164 | assert(w == &m->timer_watch); | |
1165 | ||
1166 | switch (m->state) { | |
1167 | ||
1168 | case MOUNT_MOUNTING: | |
1169 | case MOUNT_MOUNTING_DONE: | |
1170 | log_warning("%s mounting timed out. Stopping.", u->meta.id); | |
1171 | mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false); | |
1172 | break; | |
1173 | ||
1174 | case MOUNT_REMOUNTING: | |
1175 | log_warning("%s remounting timed out. Stopping.", u->meta.id); | |
1176 | m->reload_failure = true; | |
1177 | mount_enter_mounted(m, true); | |
1178 | break; | |
1179 | ||
1180 | case MOUNT_UNMOUNTING: | |
1181 | log_warning("%s unmounting timed out. Stopping.", u->meta.id); | |
1182 | mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false); | |
1183 | break; | |
1184 | ||
1185 | case MOUNT_MOUNTING_SIGTERM: | |
1186 | if (m->exec_context.send_sigkill) { | |
1187 | log_warning("%s mounting timed out. Killing.", u->meta.id); | |
1188 | mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false); | |
1189 | } else { | |
1190 | log_warning("%s mounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id); | |
1191 | ||
1192 | if (m->from_proc_self_mountinfo) | |
1193 | mount_enter_mounted(m, false); | |
1194 | else | |
1195 | mount_enter_dead(m, false); | |
1196 | } | |
1197 | break; | |
1198 | ||
1199 | case MOUNT_REMOUNTING_SIGTERM: | |
1200 | if (m->exec_context.send_sigkill) { | |
1201 | log_warning("%s remounting timed out. Killing.", u->meta.id); | |
1202 | mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false); | |
1203 | } else { | |
1204 | log_warning("%s remounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id); | |
1205 | ||
1206 | if (m->from_proc_self_mountinfo) | |
1207 | mount_enter_mounted(m, false); | |
1208 | else | |
1209 | mount_enter_dead(m, false); | |
1210 | } | |
1211 | break; | |
1212 | ||
1213 | case MOUNT_UNMOUNTING_SIGTERM: | |
1214 | if (m->exec_context.send_sigkill) { | |
1215 | log_warning("%s unmounting timed out. Killing.", u->meta.id); | |
1216 | mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false); | |
1217 | } else { | |
1218 | log_warning("%s unmounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id); | |
1219 | ||
1220 | if (m->from_proc_self_mountinfo) | |
1221 | mount_enter_mounted(m, false); | |
1222 | else | |
1223 | mount_enter_dead(m, false); | |
1224 | } | |
1225 | break; | |
1226 | ||
1227 | case MOUNT_MOUNTING_SIGKILL: | |
1228 | case MOUNT_REMOUNTING_SIGKILL: | |
1229 | case MOUNT_UNMOUNTING_SIGKILL: | |
1230 | log_warning("%s mount process still around after SIGKILL. Ignoring.", u->meta.id); | |
1231 | ||
1232 | if (m->from_proc_self_mountinfo) | |
1233 | mount_enter_mounted(m, false); | |
1234 | else | |
1235 | mount_enter_dead(m, false); | |
1236 | break; | |
1237 | ||
1238 | default: | |
1239 | assert_not_reached("Timeout at wrong time."); | |
1240 | } | |
1241 | } | |
1242 | ||
1243 | static int mount_add_one( | |
1244 | Manager *m, | |
1245 | const char *what, | |
1246 | const char *where, | |
1247 | const char *options, | |
1248 | const char *fstype, | |
1249 | int passno, | |
1250 | bool from_proc_self_mountinfo, | |
1251 | bool set_flags) { | |
1252 | int r; | |
1253 | Unit *u; | |
1254 | bool delete; | |
1255 | char *e, *w = NULL, *o = NULL, *f = NULL; | |
1256 | MountParameters *p; | |
1257 | ||
1258 | assert(m); | |
1259 | assert(what); | |
1260 | assert(where); | |
1261 | assert(options); | |
1262 | assert(fstype); | |
1263 | ||
1264 | assert(!set_flags || from_proc_self_mountinfo); | |
1265 | ||
1266 | /* Ignore API mount points. They should never be referenced in | |
1267 | * dependencies ever. */ | |
1268 | if (mount_point_is_api(where)) | |
1269 | return 0; | |
1270 | if (mount_point_ignore(where)) | |
1271 | return 0; | |
1272 | ||
1273 | if (streq(fstype, "autofs")) | |
1274 | return 0; | |
1275 | ||
1276 | /* probably some kind of swap, ignore */ | |
1277 | if (!is_path(where)) | |
1278 | return 0; | |
1279 | ||
1280 | if (!(e = unit_name_from_path(where, ".mount"))) | |
1281 | return -ENOMEM; | |
1282 | ||
1283 | if (!(u = manager_get_unit(m, e))) { | |
1284 | delete = true; | |
1285 | ||
1286 | if (!(u = unit_new(m))) { | |
1287 | free(e); | |
1288 | return -ENOMEM; | |
1289 | } | |
1290 | ||
1291 | r = unit_add_name(u, e); | |
1292 | free(e); | |
1293 | ||
1294 | if (r < 0) | |
1295 | goto fail; | |
1296 | ||
1297 | if (!(MOUNT(u)->where = strdup(where))) { | |
1298 | r = -ENOMEM; | |
1299 | goto fail; | |
1300 | } | |
1301 | ||
1302 | unit_add_to_load_queue(u); | |
1303 | } else { | |
1304 | delete = false; | |
1305 | free(e); | |
1306 | } | |
1307 | ||
1308 | if (!(w = strdup(what)) || | |
1309 | !(o = strdup(options)) || | |
1310 | !(f = strdup(fstype))) { | |
1311 | r = -ENOMEM; | |
1312 | goto fail; | |
1313 | } | |
1314 | ||
1315 | if (from_proc_self_mountinfo) { | |
1316 | p = &MOUNT(u)->parameters_proc_self_mountinfo; | |
1317 | ||
1318 | if (set_flags) { | |
1319 | MOUNT(u)->is_mounted = true; | |
1320 | MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo; | |
1321 | MOUNT(u)->just_changed = !streq_ptr(p->options, o); | |
1322 | } | |
1323 | ||
1324 | MOUNT(u)->from_proc_self_mountinfo = true; | |
1325 | } else { | |
1326 | p = &MOUNT(u)->parameters_etc_fstab; | |
1327 | MOUNT(u)->from_etc_fstab = true; | |
1328 | } | |
1329 | ||
1330 | free(p->what); | |
1331 | p->what = w; | |
1332 | ||
1333 | free(p->options); | |
1334 | p->options = o; | |
1335 | ||
1336 | free(p->fstype); | |
1337 | p->fstype = f; | |
1338 | ||
1339 | p->passno = passno; | |
1340 | ||
1341 | unit_add_to_dbus_queue(u); | |
1342 | ||
1343 | return 0; | |
1344 | ||
1345 | fail: | |
1346 | free(w); | |
1347 | free(o); | |
1348 | free(f); | |
1349 | ||
1350 | if (delete && u) | |
1351 | unit_free(u); | |
1352 | ||
1353 | return r; | |
1354 | } | |
1355 | ||
1356 | static int mount_find_pri(char *options) { | |
1357 | char *end, *pri; | |
1358 | unsigned long r; | |
1359 | ||
1360 | if (!(pri = mount_test_option(options, "pri="))) | |
1361 | return 0; | |
1362 | ||
1363 | pri += 4; | |
1364 | ||
1365 | errno = 0; | |
1366 | r = strtoul(pri, &end, 10); | |
1367 | ||
1368 | if (errno != 0) | |
1369 | return -errno; | |
1370 | ||
1371 | if (end == pri || (*end != ',' && *end != 0)) | |
1372 | return -EINVAL; | |
1373 | ||
1374 | return (int) r; | |
1375 | } | |
1376 | ||
1377 | static int mount_load_etc_fstab(Manager *m) { | |
1378 | FILE *f; | |
1379 | int r = 0; | |
1380 | struct mntent* me; | |
1381 | ||
1382 | assert(m); | |
1383 | ||
1384 | errno = 0; | |
1385 | if (!(f = setmntent("/etc/fstab", "r"))) | |
1386 | return -errno; | |
1387 | ||
1388 | while ((me = getmntent(f))) { | |
1389 | char *where, *what; | |
1390 | int k; | |
1391 | ||
1392 | if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) { | |
1393 | r = -ENOMEM; | |
1394 | goto finish; | |
1395 | } | |
1396 | ||
1397 | if (!(where = strdup(me->mnt_dir))) { | |
1398 | free(what); | |
1399 | r = -ENOMEM; | |
1400 | goto finish; | |
1401 | } | |
1402 | ||
1403 | if (what[0] == '/') | |
1404 | path_kill_slashes(what); | |
1405 | ||
1406 | if (where[0] == '/') | |
1407 | path_kill_slashes(where); | |
1408 | ||
1409 | if (streq(me->mnt_type, "swap")) { | |
1410 | int pri; | |
1411 | ||
1412 | if ((pri = mount_find_pri(me->mnt_opts)) < 0) | |
1413 | k = pri; | |
1414 | else | |
1415 | k = swap_add_one(m, | |
1416 | what, | |
1417 | NULL, | |
1418 | pri, | |
1419 | !!mount_test_option(me->mnt_opts, MNTOPT_NOAUTO), | |
1420 | !!mount_test_option(me->mnt_opts, "nofail"), | |
1421 | !!mount_test_option(me->mnt_opts, "comment=systemd.swapon"), | |
1422 | false); | |
1423 | } else | |
1424 | k = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, me->mnt_passno, false, false); | |
1425 | ||
1426 | free(what); | |
1427 | free(where); | |
1428 | ||
1429 | if (r < 0) | |
1430 | r = k; | |
1431 | } | |
1432 | ||
1433 | finish: | |
1434 | ||
1435 | endmntent(f); | |
1436 | return r; | |
1437 | } | |
1438 | ||
1439 | static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) { | |
1440 | int r = 0; | |
1441 | unsigned i; | |
1442 | char *device, *path, *options, *options2, *fstype, *d, *p, *o; | |
1443 | ||
1444 | assert(m); | |
1445 | ||
1446 | rewind(m->proc_self_mountinfo); | |
1447 | ||
1448 | for (i = 1;; i++) { | |
1449 | int k; | |
1450 | ||
1451 | device = path = options = options2 = fstype = d = p = o = NULL; | |
1452 | ||
1453 | if ((k = fscanf(m->proc_self_mountinfo, | |
1454 | "%*s " /* (1) mount id */ | |
1455 | "%*s " /* (2) parent id */ | |
1456 | "%*s " /* (3) major:minor */ | |
1457 | "%*s " /* (4) root */ | |
1458 | "%ms " /* (5) mount point */ | |
1459 | "%ms" /* (6) mount options */ | |
1460 | "%*[^-]" /* (7) optional fields */ | |
1461 | "- " /* (8) separator */ | |
1462 | "%ms " /* (9) file system type */ | |
1463 | "%ms" /* (10) mount source */ | |
1464 | "%ms" /* (11) mount options 2 */ | |
1465 | "%*[^\n]", /* some rubbish at the end */ | |
1466 | &path, | |
1467 | &options, | |
1468 | &fstype, | |
1469 | &device, | |
1470 | &options2)) != 5) { | |
1471 | ||
1472 | if (k == EOF) | |
1473 | break; | |
1474 | ||
1475 | log_warning("Failed to parse /proc/self/mountinfo:%u.", i); | |
1476 | goto clean_up; | |
1477 | } | |
1478 | ||
1479 | if (asprintf(&o, "%s,%s", options, options2) < 0) { | |
1480 | r = -ENOMEM; | |
1481 | goto finish; | |
1482 | } | |
1483 | ||
1484 | if (!(d = cunescape(device)) || | |
1485 | !(p = cunescape(path))) { | |
1486 | r = -ENOMEM; | |
1487 | goto finish; | |
1488 | } | |
1489 | ||
1490 | if ((k = mount_add_one(m, d, p, o, fstype, 0, true, set_flags)) < 0) | |
1491 | r = k; | |
1492 | ||
1493 | clean_up: | |
1494 | free(device); | |
1495 | free(path); | |
1496 | free(options); | |
1497 | free(options2); | |
1498 | free(fstype); | |
1499 | free(d); | |
1500 | free(p); | |
1501 | free(o); | |
1502 | } | |
1503 | ||
1504 | finish: | |
1505 | free(device); | |
1506 | free(path); | |
1507 | free(options); | |
1508 | free(options2); | |
1509 | free(fstype); | |
1510 | free(d); | |
1511 | free(p); | |
1512 | free(o); | |
1513 | ||
1514 | return r; | |
1515 | } | |
1516 | ||
1517 | static void mount_shutdown(Manager *m) { | |
1518 | assert(m); | |
1519 | ||
1520 | if (m->proc_self_mountinfo) { | |
1521 | fclose(m->proc_self_mountinfo); | |
1522 | m->proc_self_mountinfo = NULL; | |
1523 | } | |
1524 | } | |
1525 | ||
1526 | static int mount_enumerate(Manager *m) { | |
1527 | int r; | |
1528 | struct epoll_event ev; | |
1529 | assert(m); | |
1530 | ||
1531 | if (!m->proc_self_mountinfo) { | |
1532 | if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "re"))) | |
1533 | return -errno; | |
1534 | ||
1535 | m->mount_watch.type = WATCH_MOUNT; | |
1536 | m->mount_watch.fd = fileno(m->proc_self_mountinfo); | |
1537 | ||
1538 | zero(ev); | |
1539 | ev.events = EPOLLPRI; | |
1540 | ev.data.ptr = &m->mount_watch; | |
1541 | ||
1542 | if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0) | |
1543 | return -errno; | |
1544 | } | |
1545 | ||
1546 | if ((r = mount_load_etc_fstab(m)) < 0) | |
1547 | goto fail; | |
1548 | ||
1549 | if ((r = mount_load_proc_self_mountinfo(m, false)) < 0) | |
1550 | goto fail; | |
1551 | ||
1552 | return 0; | |
1553 | ||
1554 | fail: | |
1555 | mount_shutdown(m); | |
1556 | return r; | |
1557 | } | |
1558 | ||
1559 | void mount_fd_event(Manager *m, int events) { | |
1560 | Meta *meta; | |
1561 | int r; | |
1562 | ||
1563 | assert(m); | |
1564 | assert(events & EPOLLPRI); | |
1565 | ||
1566 | /* The manager calls this for every fd event happening on the | |
1567 | * /proc/self/mountinfo file, which informs us about mounting | |
1568 | * table changes */ | |
1569 | ||
1570 | if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) { | |
1571 | log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-r)); | |
1572 | ||
1573 | /* Reset flags, just in case, for later calls */ | |
1574 | LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) { | |
1575 | Mount *mount = (Mount*) meta; | |
1576 | ||
1577 | mount->is_mounted = mount->just_mounted = mount->just_changed = false; | |
1578 | } | |
1579 | ||
1580 | return; | |
1581 | } | |
1582 | ||
1583 | manager_dispatch_load_queue(m); | |
1584 | ||
1585 | LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) { | |
1586 | Mount *mount = (Mount*) meta; | |
1587 | ||
1588 | if (!mount->is_mounted) { | |
1589 | /* This has just been unmounted. */ | |
1590 | ||
1591 | mount->from_proc_self_mountinfo = false; | |
1592 | ||
1593 | switch (mount->state) { | |
1594 | ||
1595 | case MOUNT_MOUNTED: | |
1596 | mount_enter_dead(mount, true); | |
1597 | break; | |
1598 | ||
1599 | default: | |
1600 | mount_set_state(mount, mount->state); | |
1601 | break; | |
1602 | ||
1603 | } | |
1604 | ||
1605 | } else if (mount->just_mounted || mount->just_changed) { | |
1606 | ||
1607 | /* New or changed mount entry */ | |
1608 | ||
1609 | switch (mount->state) { | |
1610 | ||
1611 | case MOUNT_DEAD: | |
1612 | case MOUNT_FAILED: | |
1613 | mount_enter_mounted(mount, true); | |
1614 | break; | |
1615 | ||
1616 | case MOUNT_MOUNTING: | |
1617 | mount_enter_mounting_done(mount); | |
1618 | break; | |
1619 | ||
1620 | default: | |
1621 | /* Nothing really changed, but let's | |
1622 | * issue an notification call | |
1623 | * nonetheless, in case somebody is | |
1624 | * waiting for this. (e.g. file system | |
1625 | * ro/rw remounts.) */ | |
1626 | mount_set_state(mount, mount->state); | |
1627 | break; | |
1628 | } | |
1629 | } | |
1630 | ||
1631 | /* Reset the flags for later calls */ | |
1632 | mount->is_mounted = mount->just_mounted = mount->just_changed = false; | |
1633 | } | |
1634 | } | |
1635 | ||
1636 | static void mount_reset_failed(Unit *u) { | |
1637 | Mount *m = MOUNT(u); | |
1638 | ||
1639 | assert(m); | |
1640 | ||
1641 | if (m->state == MOUNT_FAILED) | |
1642 | mount_set_state(m, MOUNT_DEAD); | |
1643 | ||
1644 | m->failure = false; | |
1645 | } | |
1646 | ||
1647 | static int mount_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) { | |
1648 | Mount *m = MOUNT(u); | |
1649 | int r = 0; | |
1650 | Set *pid_set = NULL; | |
1651 | ||
1652 | assert(m); | |
1653 | ||
1654 | if (who == KILL_MAIN) { | |
1655 | dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Mount units have no main processes"); | |
1656 | return -EINVAL; | |
1657 | } | |
1658 | ||
1659 | if (m->control_pid <= 0 && who == KILL_CONTROL) { | |
1660 | dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill"); | |
1661 | return -ENOENT; | |
1662 | } | |
1663 | ||
1664 | if (m->control_pid > 0) | |
1665 | if (kill(mode == KILL_PROCESS_GROUP ? -m->control_pid : m->control_pid, signo) < 0) | |
1666 | r = -errno; | |
1667 | ||
1668 | if (mode == KILL_CONTROL_GROUP) { | |
1669 | int q; | |
1670 | ||
1671 | if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) | |
1672 | return -ENOMEM; | |
1673 | ||
1674 | /* Exclude the control pid from being killed via the cgroup */ | |
1675 | if (m->control_pid > 0) | |
1676 | if ((q = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0) { | |
1677 | r = q; | |
1678 | goto finish; | |
1679 | } | |
1680 | ||
1681 | if ((q = cgroup_bonding_kill_list(m->meta.cgroup_bondings, signo, false, pid_set)) < 0) | |
1682 | if (r != -EAGAIN && r != -ESRCH && r != -ENOENT) | |
1683 | r = q; | |
1684 | } | |
1685 | ||
1686 | finish: | |
1687 | if (pid_set) | |
1688 | set_free(pid_set); | |
1689 | ||
1690 | return r; | |
1691 | } | |
1692 | ||
1693 | static const char* const mount_state_table[_MOUNT_STATE_MAX] = { | |
1694 | [MOUNT_DEAD] = "dead", | |
1695 | [MOUNT_MOUNTING] = "mounting", | |
1696 | [MOUNT_MOUNTING_DONE] = "mounting-done", | |
1697 | [MOUNT_MOUNTED] = "mounted", | |
1698 | [MOUNT_REMOUNTING] = "remounting", | |
1699 | [MOUNT_UNMOUNTING] = "unmounting", | |
1700 | [MOUNT_MOUNTING_SIGTERM] = "mounting-sigterm", | |
1701 | [MOUNT_MOUNTING_SIGKILL] = "mounting-sigkill", | |
1702 | [MOUNT_REMOUNTING_SIGTERM] = "remounting-sigterm", | |
1703 | [MOUNT_REMOUNTING_SIGKILL] = "remounting-sigkill", | |
1704 | [MOUNT_UNMOUNTING_SIGTERM] = "unmounting-sigterm", | |
1705 | [MOUNT_UNMOUNTING_SIGKILL] = "unmounting-sigkill", | |
1706 | [MOUNT_FAILED] = "failed" | |
1707 | }; | |
1708 | ||
1709 | DEFINE_STRING_TABLE_LOOKUP(mount_state, MountState); | |
1710 | ||
1711 | static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = { | |
1712 | [MOUNT_EXEC_MOUNT] = "ExecMount", | |
1713 | [MOUNT_EXEC_UNMOUNT] = "ExecUnmount", | |
1714 | [MOUNT_EXEC_REMOUNT] = "ExecRemount", | |
1715 | }; | |
1716 | ||
1717 | DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand); | |
1718 | ||
1719 | const UnitVTable mount_vtable = { | |
1720 | .suffix = ".mount", | |
1721 | ||
1722 | .no_alias = true, | |
1723 | .no_instances = true, | |
1724 | .no_isolate = true, | |
1725 | .show_status = true, | |
1726 | ||
1727 | .init = mount_init, | |
1728 | .load = mount_load, | |
1729 | .done = mount_done, | |
1730 | ||
1731 | .coldplug = mount_coldplug, | |
1732 | ||
1733 | .dump = mount_dump, | |
1734 | ||
1735 | .start = mount_start, | |
1736 | .stop = mount_stop, | |
1737 | .reload = mount_reload, | |
1738 | ||
1739 | .kill = mount_kill, | |
1740 | ||
1741 | .serialize = mount_serialize, | |
1742 | .deserialize_item = mount_deserialize_item, | |
1743 | ||
1744 | .active_state = mount_active_state, | |
1745 | .sub_state_to_string = mount_sub_state_to_string, | |
1746 | ||
1747 | .check_gc = mount_check_gc, | |
1748 | ||
1749 | .sigchld_event = mount_sigchld_event, | |
1750 | .timer_event = mount_timer_event, | |
1751 | ||
1752 | .reset_failed = mount_reset_failed, | |
1753 | ||
1754 | .bus_interface = "org.freedesktop.systemd1.Mount", | |
1755 | .bus_message_handler = bus_mount_message_handler, | |
1756 | .bus_invalidating_properties = bus_mount_invalidating_properties, | |
1757 | ||
1758 | .enumerate = mount_enumerate, | |
1759 | .shutdown = mount_shutdown | |
1760 | }; |