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1 | /*-*- Mode: C; c-basic-offset: 8 -*-*/ | |
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 "mount.h" | |
37 | #include "dbus-mount.h" | |
38 | ||
39 | static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = { | |
40 | [MOUNT_DEAD] = UNIT_INACTIVE, | |
41 | [MOUNT_MOUNTING] = UNIT_ACTIVATING, | |
42 | [MOUNT_MOUNTING_DONE] = UNIT_ACTIVE, | |
43 | [MOUNT_MOUNTED] = UNIT_ACTIVE, | |
44 | [MOUNT_REMOUNTING] = UNIT_ACTIVE_RELOADING, | |
45 | [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING, | |
46 | [MOUNT_MOUNTING_SIGTERM] = UNIT_DEACTIVATING, | |
47 | [MOUNT_MOUNTING_SIGKILL] = UNIT_DEACTIVATING, | |
48 | [MOUNT_REMOUNTING_SIGTERM] = UNIT_ACTIVE_RELOADING, | |
49 | [MOUNT_REMOUNTING_SIGKILL] = UNIT_ACTIVE_RELOADING, | |
50 | [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING, | |
51 | [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING, | |
52 | [MOUNT_MAINTAINANCE] = UNIT_INACTIVE, | |
53 | }; | |
54 | ||
55 | static void mount_init(Unit *u) { | |
56 | Mount *m = MOUNT(u); | |
57 | ||
58 | assert(u); | |
59 | assert(u->meta.load_state == UNIT_STUB); | |
60 | ||
61 | m->timeout_usec = DEFAULT_TIMEOUT_USEC; | |
62 | exec_context_init(&m->exec_context); | |
63 | ||
64 | /* We need to make sure that /bin/mount is always called in | |
65 | * the same process group as us, so that the autofs kernel | |
66 | * side doesn't send us another mount request while we are | |
67 | * already trying to comply its last one. */ | |
68 | m->exec_context.no_setsid = true; | |
69 | ||
70 | m->timer_watch.type = WATCH_INVALID; | |
71 | ||
72 | m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; | |
73 | } | |
74 | ||
75 | static void mount_unwatch_control_pid(Mount *m) { | |
76 | assert(m); | |
77 | ||
78 | if (m->control_pid <= 0) | |
79 | return; | |
80 | ||
81 | unit_unwatch_pid(UNIT(m), m->control_pid); | |
82 | m->control_pid = 0; | |
83 | } | |
84 | ||
85 | static void mount_parameters_done(MountParameters *p) { | |
86 | assert(p); | |
87 | ||
88 | free(p->what); | |
89 | free(p->options); | |
90 | free(p->fstype); | |
91 | ||
92 | p->what = p->options = p->fstype = NULL; | |
93 | } | |
94 | ||
95 | static void mount_done(Unit *u) { | |
96 | Mount *m = MOUNT(u); | |
97 | ||
98 | assert(m); | |
99 | ||
100 | free(m->where); | |
101 | m->where = NULL; | |
102 | ||
103 | mount_parameters_done(&m->parameters_etc_fstab); | |
104 | mount_parameters_done(&m->parameters_proc_self_mountinfo); | |
105 | mount_parameters_done(&m->parameters_fragment); | |
106 | ||
107 | exec_context_done(&m->exec_context); | |
108 | exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX); | |
109 | m->control_command = NULL; | |
110 | ||
111 | mount_unwatch_control_pid(m); | |
112 | ||
113 | unit_unwatch_timer(u, &m->timer_watch); | |
114 | } | |
115 | ||
116 | static int mount_add_mount_links(Mount *m) { | |
117 | Meta *other; | |
118 | int r; | |
119 | ||
120 | assert(m); | |
121 | ||
122 | /* Adds in links to other mount points that might lie below or | |
123 | * above us in the hierarchy */ | |
124 | ||
125 | LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_MOUNT]) { | |
126 | Mount *n = (Mount*) other; | |
127 | ||
128 | if (n == m) | |
129 | continue; | |
130 | ||
131 | if (n->meta.load_state != UNIT_LOADED) | |
132 | continue; | |
133 | ||
134 | if (path_startswith(m->where, n->where)) { | |
135 | ||
136 | if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0) | |
137 | return r; | |
138 | ||
139 | if (n->from_etc_fstab || n->from_fragment) | |
140 | if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0) | |
141 | return r; | |
142 | ||
143 | } else if (path_startswith(n->where, m->where)) { | |
144 | ||
145 | if ((r = unit_add_dependency(UNIT(m), UNIT_BEFORE, UNIT(n), true)) < 0) | |
146 | return r; | |
147 | ||
148 | if (m->from_etc_fstab || m->from_fragment) | |
149 | if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0) | |
150 | return r; | |
151 | } | |
152 | } | |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
157 | static int mount_add_swap_links(Mount *m) { | |
158 | Meta *other; | |
159 | int r; | |
160 | ||
161 | assert(m); | |
162 | ||
163 | LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_SWAP]) | |
164 | if ((r = swap_add_one_mount_link((Swap*) other, m)) < 0) | |
165 | return r; | |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
170 | static int mount_add_path_links(Mount *m) { | |
171 | Meta *other; | |
172 | int r; | |
173 | ||
174 | assert(m); | |
175 | ||
176 | LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_PATH]) | |
177 | if ((r = path_add_one_mount_link((Path*) other, m)) < 0) | |
178 | return r; | |
179 | ||
180 | return 0; | |
181 | } | |
182 | ||
183 | static int mount_add_automount_links(Mount *m) { | |
184 | Meta *other; | |
185 | int r; | |
186 | ||
187 | assert(m); | |
188 | ||
189 | LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_AUTOMOUNT]) | |
190 | if ((r = automount_add_one_mount_link((Automount*) other, m)) < 0) | |
191 | return r; | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
196 | static int mount_add_socket_links(Mount *m) { | |
197 | Meta *other; | |
198 | int r; | |
199 | ||
200 | assert(m); | |
201 | ||
202 | LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_SOCKET]) | |
203 | if ((r = socket_add_one_mount_link((Socket*) other, m)) < 0) | |
204 | return r; | |
205 | ||
206 | return 0; | |
207 | } | |
208 | ||
209 | static char* mount_test_option(const char *haystack, const char *needle) { | |
210 | struct mntent me; | |
211 | ||
212 | assert(needle); | |
213 | ||
214 | /* Like glibc's hasmntopt(), but works on a string, not a | |
215 | * struct mntent */ | |
216 | ||
217 | if (!haystack) | |
218 | return false; | |
219 | ||
220 | zero(me); | |
221 | me.mnt_opts = (char*) haystack; | |
222 | ||
223 | return hasmntopt(&me, needle); | |
224 | } | |
225 | ||
226 | static int mount_add_target_links(Mount *m) { | |
227 | const char *target; | |
228 | MountParameters *p; | |
229 | Unit *tu; | |
230 | int r; | |
231 | bool noauto, handle, automount, user; | |
232 | ||
233 | assert(m); | |
234 | ||
235 | if (m->from_fragment) | |
236 | p = &m->parameters_fragment; | |
237 | else if (m->from_etc_fstab) | |
238 | p = &m->parameters_etc_fstab; | |
239 | else | |
240 | return 0; | |
241 | ||
242 | noauto = !!mount_test_option(p->options, MNTOPT_NOAUTO); | |
243 | user = mount_test_option(p->options, "user") || mount_test_option(p->options, "users"); | |
244 | handle = !!mount_test_option(p->options, "comment=systemd.mount"); | |
245 | automount = !!mount_test_option(p->options, "comment=systemd.automount"); | |
246 | ||
247 | if (mount_test_option(p->options, "_netdev") || | |
248 | fstype_is_network(p->fstype)) | |
249 | target = SPECIAL_REMOTE_FS_TARGET; | |
250 | else | |
251 | target = SPECIAL_LOCAL_FS_TARGET; | |
252 | ||
253 | if ((r = manager_load_unit(UNIT(m)->meta.manager, target, NULL, &tu)) < 0) | |
254 | return r; | |
255 | ||
256 | if (automount && m->meta.manager->running_as != MANAGER_SESSION) { | |
257 | Unit *am; | |
258 | ||
259 | if ((r = unit_load_related_unit(UNIT(m), ".automount", &am)) < 0) | |
260 | return r; | |
261 | ||
262 | if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(am), true)) < 0) | |
263 | return r; | |
264 | ||
265 | return unit_add_dependency(UNIT(am), UNIT_BEFORE, tu, true); | |
266 | ||
267 | } else { | |
268 | ||
269 | if (!noauto && handle) | |
270 | if (user || m->meta.manager->running_as != MANAGER_SESSION) | |
271 | if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true)) < 0) | |
272 | return r; | |
273 | ||
274 | return unit_add_dependency(UNIT(m), UNIT_BEFORE, tu, true); | |
275 | } | |
276 | } | |
277 | ||
278 | static int mount_verify(Mount *m) { | |
279 | bool b; | |
280 | char *e; | |
281 | assert(m); | |
282 | ||
283 | if (m->meta.load_state != UNIT_LOADED) | |
284 | return 0; | |
285 | ||
286 | if (!m->from_etc_fstab && !m->from_fragment && !m->from_proc_self_mountinfo) | |
287 | return -ENOENT; | |
288 | ||
289 | if (!(e = unit_name_from_path(m->where, ".mount"))) | |
290 | return -ENOMEM; | |
291 | ||
292 | b = unit_has_name(UNIT(m), e); | |
293 | free(e); | |
294 | ||
295 | if (!b) { | |
296 | log_error("%s's Where setting doesn't match unit name. Refusing.", UNIT(m)->meta.id); | |
297 | return -EINVAL; | |
298 | } | |
299 | ||
300 | if (m->meta.fragment_path && !m->parameters_fragment.what) { | |
301 | log_error("%s's What setting is missing. Refusing.", UNIT(m)->meta.id); | |
302 | return -EBADMSG; | |
303 | } | |
304 | ||
305 | return 0; | |
306 | } | |
307 | ||
308 | static int mount_load(Unit *u) { | |
309 | Mount *m = MOUNT(u); | |
310 | int r; | |
311 | ||
312 | assert(u); | |
313 | assert(u->meta.load_state == UNIT_STUB); | |
314 | ||
315 | if ((r = unit_load_fragment_and_dropin_optional(u)) < 0) | |
316 | return r; | |
317 | ||
318 | /* This is a new unit? Then let's add in some extras */ | |
319 | if (u->meta.load_state == UNIT_LOADED) { | |
320 | const char *what = NULL; | |
321 | ||
322 | if (m->meta.fragment_path) | |
323 | m->from_fragment = true; | |
324 | ||
325 | if (!m->where) | |
326 | if (!(m->where = unit_name_to_path(u->meta.id))) | |
327 | return -ENOMEM; | |
328 | ||
329 | path_kill_slashes(m->where); | |
330 | ||
331 | if (!m->meta.description) | |
332 | if ((r = unit_set_description(u, m->where)) < 0) | |
333 | return r; | |
334 | ||
335 | if (m->from_fragment && m->parameters_fragment.what) | |
336 | what = m->parameters_fragment.what; | |
337 | else if (m->from_etc_fstab && m->parameters_etc_fstab.what) | |
338 | what = m->parameters_etc_fstab.what; | |
339 | else if (m->from_proc_self_mountinfo && m->parameters_proc_self_mountinfo.what) | |
340 | what = m->parameters_proc_self_mountinfo.what; | |
341 | ||
342 | if (what) | |
343 | if ((r = unit_add_node_link(u, what, | |
344 | (u->meta.manager->running_as == MANAGER_INIT || | |
345 | u->meta.manager->running_as == MANAGER_SYSTEM))) < 0) | |
346 | return r; | |
347 | ||
348 | if ((r = mount_add_mount_links(m)) < 0) | |
349 | return r; | |
350 | ||
351 | if ((r = mount_add_socket_links(m)) < 0) | |
352 | return r; | |
353 | ||
354 | if ((r = mount_add_swap_links(m)) < 0) | |
355 | return r; | |
356 | ||
357 | if ((r = mount_add_path_links(m)) < 0) | |
358 | return r; | |
359 | ||
360 | if ((r = mount_add_automount_links(m)) < 0) | |
361 | return r; | |
362 | ||
363 | if ((r = mount_add_target_links(m)) < 0) | |
364 | return r; | |
365 | ||
366 | if ((r = unit_add_default_cgroup(u)) < 0) | |
367 | return r; | |
368 | } | |
369 | ||
370 | return mount_verify(m); | |
371 | } | |
372 | ||
373 | static int mount_notify_automount(Mount *m, int status) { | |
374 | Unit *p; | |
375 | int r; | |
376 | ||
377 | assert(m); | |
378 | ||
379 | if ((r = unit_get_related_unit(UNIT(m), ".automount", &p)) < 0) | |
380 | return r == -ENOENT ? 0 : r; | |
381 | ||
382 | return automount_send_ready(AUTOMOUNT(p), status); | |
383 | } | |
384 | ||
385 | static void mount_set_state(Mount *m, MountState state) { | |
386 | MountState old_state; | |
387 | assert(m); | |
388 | ||
389 | old_state = m->state; | |
390 | m->state = state; | |
391 | ||
392 | if (state != MOUNT_MOUNTING && | |
393 | state != MOUNT_MOUNTING_DONE && | |
394 | state != MOUNT_REMOUNTING && | |
395 | state != MOUNT_UNMOUNTING && | |
396 | state != MOUNT_MOUNTING_SIGTERM && | |
397 | state != MOUNT_MOUNTING_SIGKILL && | |
398 | state != MOUNT_UNMOUNTING_SIGTERM && | |
399 | state != MOUNT_UNMOUNTING_SIGKILL && | |
400 | state != MOUNT_REMOUNTING_SIGTERM && | |
401 | state != MOUNT_REMOUNTING_SIGKILL) { | |
402 | unit_unwatch_timer(UNIT(m), &m->timer_watch); | |
403 | mount_unwatch_control_pid(m); | |
404 | m->control_command = NULL; | |
405 | m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; | |
406 | } | |
407 | ||
408 | if (state == MOUNT_MOUNTED || | |
409 | state == MOUNT_REMOUNTING) | |
410 | mount_notify_automount(m, 0); | |
411 | else if (state == MOUNT_DEAD || | |
412 | state == MOUNT_UNMOUNTING || | |
413 | state == MOUNT_MOUNTING_SIGTERM || | |
414 | state == MOUNT_MOUNTING_SIGKILL || | |
415 | state == MOUNT_REMOUNTING_SIGTERM || | |
416 | state == MOUNT_REMOUNTING_SIGKILL || | |
417 | state == MOUNT_UNMOUNTING_SIGTERM || | |
418 | state == MOUNT_UNMOUNTING_SIGKILL || | |
419 | state == MOUNT_MAINTAINANCE) | |
420 | mount_notify_automount(m, -ENODEV); | |
421 | ||
422 | if (state != old_state) | |
423 | log_debug("%s changed %s -> %s", | |
424 | UNIT(m)->meta.id, | |
425 | mount_state_to_string(old_state), | |
426 | mount_state_to_string(state)); | |
427 | ||
428 | unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state]); | |
429 | } | |
430 | ||
431 | static int mount_coldplug(Unit *u) { | |
432 | Mount *m = MOUNT(u); | |
433 | MountState new_state = MOUNT_DEAD; | |
434 | int r; | |
435 | ||
436 | assert(m); | |
437 | assert(m->state == MOUNT_DEAD); | |
438 | ||
439 | if (m->deserialized_state != m->state) | |
440 | new_state = m->deserialized_state; | |
441 | else if (m->from_proc_self_mountinfo) | |
442 | new_state = MOUNT_MOUNTED; | |
443 | ||
444 | if (new_state != m->state) { | |
445 | ||
446 | if (new_state == MOUNT_MOUNTING || | |
447 | new_state == MOUNT_MOUNTING_DONE || | |
448 | new_state == MOUNT_REMOUNTING || | |
449 | new_state == MOUNT_UNMOUNTING || | |
450 | new_state == MOUNT_MOUNTING_SIGTERM || | |
451 | new_state == MOUNT_MOUNTING_SIGKILL || | |
452 | new_state == MOUNT_UNMOUNTING_SIGTERM || | |
453 | new_state == MOUNT_UNMOUNTING_SIGKILL || | |
454 | new_state == MOUNT_REMOUNTING_SIGTERM || | |
455 | new_state == MOUNT_REMOUNTING_SIGKILL) { | |
456 | ||
457 | if (m->control_pid <= 0) | |
458 | return -EBADMSG; | |
459 | ||
460 | if ((r = unit_watch_pid(UNIT(m), m->control_pid)) < 0) | |
461 | return r; | |
462 | ||
463 | if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0) | |
464 | return r; | |
465 | } | |
466 | ||
467 | mount_set_state(m, new_state); | |
468 | } | |
469 | ||
470 | return 0; | |
471 | } | |
472 | ||
473 | static void mount_dump(Unit *u, FILE *f, const char *prefix) { | |
474 | Mount *m = MOUNT(u); | |
475 | MountParameters *p; | |
476 | ||
477 | assert(m); | |
478 | assert(f); | |
479 | ||
480 | if (m->from_proc_self_mountinfo) | |
481 | p = &m->parameters_proc_self_mountinfo; | |
482 | else if (m->from_fragment) | |
483 | p = &m->parameters_fragment; | |
484 | else | |
485 | p = &m->parameters_etc_fstab; | |
486 | ||
487 | fprintf(f, | |
488 | "%sMount State: %s\n" | |
489 | "%sWhere: %s\n" | |
490 | "%sWhat: %s\n" | |
491 | "%sFile System Type: %s\n" | |
492 | "%sOptions: %s\n" | |
493 | "%sFrom /etc/fstab: %s\n" | |
494 | "%sFrom /proc/self/mountinfo: %s\n" | |
495 | "%sFrom fragment: %s\n" | |
496 | "%sKillMode: %s\n", | |
497 | prefix, mount_state_to_string(m->state), | |
498 | prefix, m->where, | |
499 | prefix, strna(p->what), | |
500 | prefix, strna(p->fstype), | |
501 | prefix, strna(p->options), | |
502 | prefix, yes_no(m->from_etc_fstab), | |
503 | prefix, yes_no(m->from_proc_self_mountinfo), | |
504 | prefix, yes_no(m->from_fragment), | |
505 | prefix, kill_mode_to_string(m->kill_mode)); | |
506 | ||
507 | if (m->control_pid > 0) | |
508 | fprintf(f, | |
509 | "%sControl PID: %llu\n", | |
510 | prefix, (unsigned long long) m->control_pid); | |
511 | ||
512 | exec_context_dump(&m->exec_context, f, prefix); | |
513 | } | |
514 | ||
515 | static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) { | |
516 | pid_t pid; | |
517 | int r; | |
518 | ||
519 | assert(m); | |
520 | assert(c); | |
521 | assert(_pid); | |
522 | ||
523 | if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0) | |
524 | goto fail; | |
525 | ||
526 | if ((r = exec_spawn(c, | |
527 | NULL, | |
528 | &m->exec_context, | |
529 | NULL, 0, | |
530 | m->meta.manager->environment, | |
531 | true, | |
532 | true, | |
533 | UNIT(m)->meta.manager->confirm_spawn, | |
534 | UNIT(m)->meta.cgroup_bondings, | |
535 | &pid)) < 0) | |
536 | goto fail; | |
537 | ||
538 | if ((r = unit_watch_pid(UNIT(m), pid)) < 0) | |
539 | /* FIXME: we need to do something here */ | |
540 | goto fail; | |
541 | ||
542 | *_pid = pid; | |
543 | ||
544 | return 0; | |
545 | ||
546 | fail: | |
547 | unit_unwatch_timer(UNIT(m), &m->timer_watch); | |
548 | ||
549 | return r; | |
550 | } | |
551 | ||
552 | static void mount_enter_dead(Mount *m, bool success) { | |
553 | assert(m); | |
554 | ||
555 | if (!success) | |
556 | m->failure = true; | |
557 | ||
558 | mount_set_state(m, m->failure ? MOUNT_MAINTAINANCE : MOUNT_DEAD); | |
559 | } | |
560 | ||
561 | static void mount_enter_mounted(Mount *m, bool success) { | |
562 | assert(m); | |
563 | ||
564 | if (!success) | |
565 | m->failure = true; | |
566 | ||
567 | mount_set_state(m, MOUNT_MOUNTED); | |
568 | } | |
569 | ||
570 | static void mount_enter_signal(Mount *m, MountState state, bool success) { | |
571 | int r; | |
572 | bool sent = false; | |
573 | ||
574 | assert(m); | |
575 | ||
576 | if (!success) | |
577 | m->failure = true; | |
578 | ||
579 | if (m->kill_mode != KILL_NONE) { | |
580 | int sig = (state == MOUNT_MOUNTING_SIGTERM || | |
581 | state == MOUNT_UNMOUNTING_SIGTERM || | |
582 | state == MOUNT_REMOUNTING_SIGTERM) ? SIGTERM : SIGKILL; | |
583 | ||
584 | if (m->kill_mode == KILL_CONTROL_GROUP) { | |
585 | ||
586 | if ((r = cgroup_bonding_kill_list(UNIT(m)->meta.cgroup_bondings, sig)) < 0) { | |
587 | if (r != -EAGAIN && r != -ESRCH) | |
588 | goto fail; | |
589 | } else | |
590 | sent = true; | |
591 | } | |
592 | ||
593 | if (!sent && m->control_pid > 0) | |
594 | if (kill(m->kill_mode == KILL_PROCESS ? m->control_pid : -m->control_pid, sig) < 0 && errno != ESRCH) { | |
595 | r = -errno; | |
596 | goto fail; | |
597 | } | |
598 | } | |
599 | ||
600 | if (sent) { | |
601 | if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0) | |
602 | goto fail; | |
603 | ||
604 | mount_set_state(m, state); | |
605 | } else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL) | |
606 | mount_enter_mounted(m, true); | |
607 | else | |
608 | mount_enter_dead(m, true); | |
609 | ||
610 | return; | |
611 | ||
612 | fail: | |
613 | log_warning("%s failed to kill processes: %s", UNIT(m)->meta.id, strerror(-r)); | |
614 | ||
615 | if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL) | |
616 | mount_enter_mounted(m, false); | |
617 | else | |
618 | mount_enter_dead(m, false); | |
619 | } | |
620 | ||
621 | static void mount_enter_unmounting(Mount *m, bool success) { | |
622 | int r; | |
623 | ||
624 | assert(m); | |
625 | ||
626 | if (!success) | |
627 | m->failure = true; | |
628 | ||
629 | m->control_command_id = MOUNT_EXEC_UNMOUNT; | |
630 | m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT; | |
631 | ||
632 | if ((r = exec_command_set( | |
633 | m->control_command, | |
634 | "/bin/umount", | |
635 | m->where, | |
636 | NULL)) < 0) | |
637 | goto fail; | |
638 | ||
639 | mount_unwatch_control_pid(m); | |
640 | ||
641 | if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0) | |
642 | goto fail; | |
643 | ||
644 | mount_set_state(m, MOUNT_UNMOUNTING); | |
645 | ||
646 | return; | |
647 | ||
648 | fail: | |
649 | log_warning("%s failed to run umount exectuable: %s", UNIT(m)->meta.id, strerror(-r)); | |
650 | mount_enter_mounted(m, false); | |
651 | } | |
652 | ||
653 | static void mount_enter_mounting(Mount *m) { | |
654 | int r; | |
655 | ||
656 | assert(m); | |
657 | ||
658 | m->control_command_id = MOUNT_EXEC_MOUNT; | |
659 | m->control_command = m->exec_command + MOUNT_EXEC_MOUNT; | |
660 | ||
661 | if (m->from_fragment) | |
662 | r = exec_command_set( | |
663 | m->control_command, | |
664 | "/bin/mount", | |
665 | m->parameters_fragment.what, | |
666 | m->where, | |
667 | "-t", m->parameters_fragment.fstype, | |
668 | m->parameters_fragment.options ? "-o" : NULL, m->parameters_fragment.options, | |
669 | NULL); | |
670 | else if (m->from_etc_fstab) | |
671 | r = exec_command_set( | |
672 | m->control_command, | |
673 | "/bin/mount", | |
674 | m->where, | |
675 | NULL); | |
676 | else | |
677 | r = -ENOENT; | |
678 | ||
679 | if (r < 0) | |
680 | goto fail; | |
681 | ||
682 | mount_unwatch_control_pid(m); | |
683 | ||
684 | if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0) | |
685 | goto fail; | |
686 | ||
687 | mount_set_state(m, MOUNT_MOUNTING); | |
688 | ||
689 | return; | |
690 | ||
691 | fail: | |
692 | log_warning("%s failed to run mount exectuable: %s", UNIT(m)->meta.id, strerror(-r)); | |
693 | mount_enter_dead(m, false); | |
694 | } | |
695 | ||
696 | static void mount_enter_mounting_done(Mount *m) { | |
697 | assert(m); | |
698 | ||
699 | mount_set_state(m, MOUNT_MOUNTING_DONE); | |
700 | } | |
701 | ||
702 | static void mount_enter_remounting(Mount *m, bool success) { | |
703 | int r; | |
704 | ||
705 | assert(m); | |
706 | ||
707 | if (!success) | |
708 | m->failure = true; | |
709 | ||
710 | m->control_command_id = MOUNT_EXEC_REMOUNT; | |
711 | m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT; | |
712 | ||
713 | if (m->from_fragment) { | |
714 | char *buf = NULL; | |
715 | const char *o; | |
716 | ||
717 | if (m->parameters_fragment.options) { | |
718 | if (!(buf = strappend("remount,", m->parameters_fragment.options))) { | |
719 | r = -ENOMEM; | |
720 | goto fail; | |
721 | } | |
722 | ||
723 | o = buf; | |
724 | } else | |
725 | o = "remount"; | |
726 | ||
727 | r = exec_command_set( | |
728 | m->control_command, | |
729 | "/bin/mount", | |
730 | m->parameters_fragment.what, | |
731 | m->where, | |
732 | "-t", m->parameters_fragment.fstype, | |
733 | "-o", o, | |
734 | NULL); | |
735 | ||
736 | free(buf); | |
737 | } else if (m->from_etc_fstab) | |
738 | r = exec_command_set( | |
739 | m->control_command, | |
740 | "/bin/mount", | |
741 | m->where, | |
742 | "-o", "remount", | |
743 | NULL); | |
744 | else | |
745 | r = -ENOENT; | |
746 | ||
747 | if (r < 0) { | |
748 | r = -ENOMEM; | |
749 | goto fail; | |
750 | } | |
751 | ||
752 | mount_unwatch_control_pid(m); | |
753 | ||
754 | if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0) | |
755 | goto fail; | |
756 | ||
757 | mount_set_state(m, MOUNT_REMOUNTING); | |
758 | ||
759 | return; | |
760 | ||
761 | fail: | |
762 | mount_enter_mounted(m, false); | |
763 | } | |
764 | ||
765 | static int mount_start(Unit *u) { | |
766 | Mount *m = MOUNT(u); | |
767 | ||
768 | assert(m); | |
769 | ||
770 | /* We cannot fulfill this request right now, try again later | |
771 | * please! */ | |
772 | if (m->state == MOUNT_UNMOUNTING || | |
773 | m->state == MOUNT_UNMOUNTING_SIGTERM || | |
774 | m->state == MOUNT_UNMOUNTING_SIGKILL) | |
775 | return -EAGAIN; | |
776 | ||
777 | /* Already on it! */ | |
778 | if (m->state == MOUNT_MOUNTING || | |
779 | m->state == MOUNT_MOUNTING_SIGTERM || | |
780 | m->state == MOUNT_MOUNTING_SIGKILL) | |
781 | return 0; | |
782 | ||
783 | assert(m->state == MOUNT_DEAD || m->state == MOUNT_MAINTAINANCE); | |
784 | ||
785 | m->failure = false; | |
786 | mount_enter_mounting(m); | |
787 | return 0; | |
788 | } | |
789 | ||
790 | static int mount_stop(Unit *u) { | |
791 | Mount *m = MOUNT(u); | |
792 | ||
793 | assert(m); | |
794 | ||
795 | /* Cann't do this right now. */ | |
796 | if (m->state == MOUNT_MOUNTING || | |
797 | m->state == MOUNT_MOUNTING_DONE || | |
798 | m->state == MOUNT_MOUNTING_SIGTERM || | |
799 | m->state == MOUNT_MOUNTING_SIGKILL || | |
800 | m->state == MOUNT_REMOUNTING || | |
801 | m->state == MOUNT_REMOUNTING_SIGTERM || | |
802 | m->state == MOUNT_REMOUNTING_SIGKILL) | |
803 | return -EAGAIN; | |
804 | ||
805 | /* Already on it */ | |
806 | if (m->state == MOUNT_UNMOUNTING || | |
807 | m->state == MOUNT_UNMOUNTING_SIGKILL || | |
808 | m->state == MOUNT_UNMOUNTING_SIGTERM) | |
809 | return 0; | |
810 | ||
811 | assert(m->state == MOUNT_MOUNTED); | |
812 | ||
813 | mount_enter_unmounting(m, true); | |
814 | return 0; | |
815 | } | |
816 | ||
817 | static int mount_reload(Unit *u) { | |
818 | Mount *m = MOUNT(u); | |
819 | ||
820 | assert(m); | |
821 | ||
822 | if (m->state == MOUNT_MOUNTING_DONE) | |
823 | return -EAGAIN; | |
824 | ||
825 | assert(m->state == MOUNT_MOUNTED); | |
826 | ||
827 | mount_enter_remounting(m, true); | |
828 | return 0; | |
829 | } | |
830 | ||
831 | static int mount_serialize(Unit *u, FILE *f, FDSet *fds) { | |
832 | Mount *m = MOUNT(u); | |
833 | ||
834 | assert(m); | |
835 | assert(f); | |
836 | assert(fds); | |
837 | ||
838 | unit_serialize_item(u, f, "state", mount_state_to_string(m->state)); | |
839 | unit_serialize_item(u, f, "failure", yes_no(m->failure)); | |
840 | ||
841 | if (m->control_pid > 0) | |
842 | unit_serialize_item_format(u, f, "control-pid", "%u", (unsigned) m->control_pid); | |
843 | ||
844 | if (m->control_command_id >= 0) | |
845 | unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id)); | |
846 | ||
847 | return 0; | |
848 | } | |
849 | ||
850 | static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
851 | Mount *m = MOUNT(u); | |
852 | int r; | |
853 | ||
854 | assert(u); | |
855 | assert(key); | |
856 | assert(value); | |
857 | assert(fds); | |
858 | ||
859 | if (streq(key, "state")) { | |
860 | MountState state; | |
861 | ||
862 | if ((state = mount_state_from_string(value)) < 0) | |
863 | log_debug("Failed to parse state value %s", value); | |
864 | else | |
865 | m->deserialized_state = state; | |
866 | } else if (streq(key, "failure")) { | |
867 | int b; | |
868 | ||
869 | if ((b = parse_boolean(value)) < 0) | |
870 | log_debug("Failed to parse failure value %s", value); | |
871 | else | |
872 | m->failure = b || m->failure; | |
873 | ||
874 | } else if (streq(key, "control-pid")) { | |
875 | unsigned pid; | |
876 | ||
877 | if ((r = safe_atou(value, &pid)) < 0 || pid <= 0) | |
878 | log_debug("Failed to parse control-pid value %s", value); | |
879 | else | |
880 | m->control_pid = (pid_t) pid; | |
881 | } else if (streq(key, "control-command")) { | |
882 | MountExecCommand id; | |
883 | ||
884 | if ((id = mount_exec_command_from_string(value)) < 0) | |
885 | log_debug("Failed to parse exec-command value %s", value); | |
886 | else { | |
887 | m->control_command_id = id; | |
888 | m->control_command = m->exec_command + id; | |
889 | } | |
890 | ||
891 | } else | |
892 | log_debug("Unknown serialization key '%s'", key); | |
893 | ||
894 | return 0; | |
895 | } | |
896 | ||
897 | static UnitActiveState mount_active_state(Unit *u) { | |
898 | assert(u); | |
899 | ||
900 | return state_translation_table[MOUNT(u)->state]; | |
901 | } | |
902 | ||
903 | static const char *mount_sub_state_to_string(Unit *u) { | |
904 | assert(u); | |
905 | ||
906 | return mount_state_to_string(MOUNT(u)->state); | |
907 | } | |
908 | ||
909 | static bool mount_check_gc(Unit *u) { | |
910 | Mount *m = MOUNT(u); | |
911 | ||
912 | assert(m); | |
913 | ||
914 | return m->from_etc_fstab || m->from_proc_self_mountinfo; | |
915 | } | |
916 | ||
917 | static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) { | |
918 | Mount *m = MOUNT(u); | |
919 | bool success; | |
920 | ||
921 | assert(m); | |
922 | assert(pid >= 0); | |
923 | ||
924 | success = is_clean_exit(code, status); | |
925 | m->failure = m->failure || !success; | |
926 | ||
927 | assert(m->control_pid == pid); | |
928 | m->control_pid = 0; | |
929 | ||
930 | if (m->control_command) { | |
931 | exec_status_fill(&m->control_command->exec_status, pid, code, status); | |
932 | m->control_command = NULL; | |
933 | m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; | |
934 | } | |
935 | ||
936 | log_debug("%s control process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status); | |
937 | ||
938 | /* Note that mount(8) returning and the kernel sending us a | |
939 | * mount table change event might happen out-of-order. If an | |
940 | * operation succeed we assume the kernel will follow soon too | |
941 | * and already change into the resulting state. If it fails | |
942 | * we check if the kernel still knows about the mount. and | |
943 | * change state accordingly. */ | |
944 | ||
945 | switch (m->state) { | |
946 | ||
947 | case MOUNT_MOUNTING: | |
948 | case MOUNT_MOUNTING_DONE: | |
949 | case MOUNT_MOUNTING_SIGKILL: | |
950 | case MOUNT_MOUNTING_SIGTERM: | |
951 | case MOUNT_REMOUNTING: | |
952 | case MOUNT_REMOUNTING_SIGKILL: | |
953 | case MOUNT_REMOUNTING_SIGTERM: | |
954 | ||
955 | if (success) | |
956 | mount_enter_mounted(m, true); | |
957 | else if (m->from_proc_self_mountinfo) | |
958 | mount_enter_mounted(m, false); | |
959 | else | |
960 | mount_enter_dead(m, false); | |
961 | break; | |
962 | ||
963 | case MOUNT_UNMOUNTING: | |
964 | case MOUNT_UNMOUNTING_SIGKILL: | |
965 | case MOUNT_UNMOUNTING_SIGTERM: | |
966 | ||
967 | if (success) | |
968 | mount_enter_dead(m, true); | |
969 | else if (m->from_proc_self_mountinfo) | |
970 | mount_enter_mounted(m, false); | |
971 | else | |
972 | mount_enter_dead(m, false); | |
973 | break; | |
974 | ||
975 | default: | |
976 | assert_not_reached("Uh, control process died at wrong time."); | |
977 | } | |
978 | } | |
979 | ||
980 | static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) { | |
981 | Mount *m = MOUNT(u); | |
982 | ||
983 | assert(m); | |
984 | assert(elapsed == 1); | |
985 | assert(w == &m->timer_watch); | |
986 | ||
987 | switch (m->state) { | |
988 | ||
989 | case MOUNT_MOUNTING: | |
990 | case MOUNT_MOUNTING_DONE: | |
991 | log_warning("%s mounting timed out. Stopping.", u->meta.id); | |
992 | mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false); | |
993 | break; | |
994 | ||
995 | case MOUNT_REMOUNTING: | |
996 | log_warning("%s remounting timed out. Stopping.", u->meta.id); | |
997 | mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, false); | |
998 | break; | |
999 | ||
1000 | case MOUNT_UNMOUNTING: | |
1001 | log_warning("%s unmounting timed out. Stopping.", u->meta.id); | |
1002 | mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false); | |
1003 | break; | |
1004 | ||
1005 | case MOUNT_MOUNTING_SIGTERM: | |
1006 | log_warning("%s mounting timed out. Killing.", u->meta.id); | |
1007 | mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false); | |
1008 | break; | |
1009 | ||
1010 | case MOUNT_REMOUNTING_SIGTERM: | |
1011 | log_warning("%s remounting timed out. Killing.", u->meta.id); | |
1012 | mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false); | |
1013 | break; | |
1014 | ||
1015 | case MOUNT_UNMOUNTING_SIGTERM: | |
1016 | log_warning("%s unmounting timed out. Killing.", u->meta.id); | |
1017 | mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false); | |
1018 | break; | |
1019 | ||
1020 | case MOUNT_MOUNTING_SIGKILL: | |
1021 | case MOUNT_REMOUNTING_SIGKILL: | |
1022 | case MOUNT_UNMOUNTING_SIGKILL: | |
1023 | log_warning("%s mount process still around after SIGKILL. Ignoring.", u->meta.id); | |
1024 | ||
1025 | if (m->from_proc_self_mountinfo) | |
1026 | mount_enter_mounted(m, false); | |
1027 | else | |
1028 | mount_enter_dead(m, false); | |
1029 | break; | |
1030 | ||
1031 | default: | |
1032 | assert_not_reached("Timeout at wrong time."); | |
1033 | } | |
1034 | } | |
1035 | ||
1036 | static int mount_add_one( | |
1037 | Manager *m, | |
1038 | const char *what, | |
1039 | const char *where, | |
1040 | const char *options, | |
1041 | const char *fstype, | |
1042 | bool from_proc_self_mountinfo, | |
1043 | bool set_flags) { | |
1044 | int r; | |
1045 | Unit *u; | |
1046 | bool delete; | |
1047 | char *e, *w = NULL, *o = NULL, *f = NULL; | |
1048 | MountParameters *p; | |
1049 | ||
1050 | assert(m); | |
1051 | assert(what); | |
1052 | assert(where); | |
1053 | assert(options); | |
1054 | assert(fstype); | |
1055 | ||
1056 | assert(!set_flags || from_proc_self_mountinfo); | |
1057 | ||
1058 | /* Ignore API mount points. They should never be referenced in | |
1059 | * dependencies ever. */ | |
1060 | if (mount_point_is_api(where)) | |
1061 | return 0; | |
1062 | ||
1063 | if (streq(fstype, "autofs")) | |
1064 | return 0; | |
1065 | ||
1066 | /* probably some kind of swap, ignore */ | |
1067 | if (!is_path(where)) | |
1068 | return 0; | |
1069 | ||
1070 | if (!(e = unit_name_from_path(where, ".mount"))) | |
1071 | return -ENOMEM; | |
1072 | ||
1073 | if (!(u = manager_get_unit(m, e))) { | |
1074 | delete = true; | |
1075 | ||
1076 | if (!(u = unit_new(m))) { | |
1077 | free(e); | |
1078 | return -ENOMEM; | |
1079 | } | |
1080 | ||
1081 | r = unit_add_name(u, e); | |
1082 | free(e); | |
1083 | ||
1084 | if (r < 0) | |
1085 | goto fail; | |
1086 | ||
1087 | if (!(MOUNT(u)->where = strdup(where))) { | |
1088 | r = -ENOMEM; | |
1089 | goto fail; | |
1090 | } | |
1091 | ||
1092 | unit_add_to_load_queue(u); | |
1093 | } else { | |
1094 | delete = false; | |
1095 | free(e); | |
1096 | } | |
1097 | ||
1098 | if (!(w = strdup(what)) || | |
1099 | !(o = strdup(options)) || | |
1100 | !(f = strdup(fstype))) { | |
1101 | r = -ENOMEM; | |
1102 | goto fail; | |
1103 | } | |
1104 | ||
1105 | if (from_proc_self_mountinfo) { | |
1106 | p = &MOUNT(u)->parameters_proc_self_mountinfo; | |
1107 | ||
1108 | if (set_flags) { | |
1109 | MOUNT(u)->is_mounted = true; | |
1110 | MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo; | |
1111 | MOUNT(u)->just_changed = !streq_ptr(p->options, o); | |
1112 | } | |
1113 | ||
1114 | MOUNT(u)->from_proc_self_mountinfo = true; | |
1115 | } else { | |
1116 | p = &MOUNT(u)->parameters_etc_fstab; | |
1117 | MOUNT(u)->from_etc_fstab = true; | |
1118 | } | |
1119 | ||
1120 | free(p->what); | |
1121 | p->what = w; | |
1122 | ||
1123 | free(p->options); | |
1124 | p->options = o; | |
1125 | ||
1126 | free(p->fstype); | |
1127 | p->fstype = f; | |
1128 | ||
1129 | unit_add_to_dbus_queue(u); | |
1130 | ||
1131 | return 0; | |
1132 | ||
1133 | fail: | |
1134 | free(w); | |
1135 | free(o); | |
1136 | free(f); | |
1137 | ||
1138 | if (delete && u) | |
1139 | unit_free(u); | |
1140 | ||
1141 | return r; | |
1142 | } | |
1143 | ||
1144 | static char *fstab_node_to_udev_node(char *p) { | |
1145 | char *dn, *t; | |
1146 | int r; | |
1147 | ||
1148 | /* FIXME: to follow udev's logic 100% we need to leave valid | |
1149 | * UTF8 chars unescaped */ | |
1150 | ||
1151 | if (startswith(p, "LABEL=")) { | |
1152 | ||
1153 | if (!(t = xescape(p+6, "/ "))) | |
1154 | return NULL; | |
1155 | ||
1156 | r = asprintf(&dn, "/dev/disk/by-label/%s", t); | |
1157 | free(t); | |
1158 | ||
1159 | if (r < 0) | |
1160 | return NULL; | |
1161 | ||
1162 | return dn; | |
1163 | } | |
1164 | ||
1165 | if (startswith(p, "UUID=")) { | |
1166 | ||
1167 | if (!(t = xescape(p+5, "/ "))) | |
1168 | return NULL; | |
1169 | ||
1170 | r = asprintf(&dn, "/dev/disk/by-uuid/%s", ascii_strlower(t)); | |
1171 | free(t); | |
1172 | ||
1173 | if (r < 0) | |
1174 | return NULL; | |
1175 | ||
1176 | return dn; | |
1177 | } | |
1178 | ||
1179 | return strdup(p); | |
1180 | } | |
1181 | ||
1182 | static int mount_find_pri(char *options) { | |
1183 | char *end, *pri; | |
1184 | unsigned long r; | |
1185 | ||
1186 | if (!(pri = mount_test_option(options, "pri="))) | |
1187 | return 0; | |
1188 | ||
1189 | pri += 4; | |
1190 | ||
1191 | errno = 0; | |
1192 | r = strtoul(pri, &end, 10); | |
1193 | ||
1194 | if (errno != 0) | |
1195 | return -errno; | |
1196 | ||
1197 | if (end == pri || (*end != ',' && *end != 0)) | |
1198 | return -EINVAL; | |
1199 | ||
1200 | return (int) r; | |
1201 | } | |
1202 | ||
1203 | static int mount_load_etc_fstab(Manager *m) { | |
1204 | FILE *f; | |
1205 | int r; | |
1206 | struct mntent* me; | |
1207 | ||
1208 | assert(m); | |
1209 | ||
1210 | errno = 0; | |
1211 | if (!(f = setmntent("/etc/fstab", "r"))) | |
1212 | return -errno; | |
1213 | ||
1214 | while ((me = getmntent(f))) { | |
1215 | char *where, *what; | |
1216 | ||
1217 | if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) { | |
1218 | r = -ENOMEM; | |
1219 | goto finish; | |
1220 | } | |
1221 | ||
1222 | if (!(where = strdup(me->mnt_dir))) { | |
1223 | free(what); | |
1224 | r = -ENOMEM; | |
1225 | goto finish; | |
1226 | } | |
1227 | ||
1228 | if (what[0] == '/') | |
1229 | path_kill_slashes(what); | |
1230 | ||
1231 | if (where[0] == '/') | |
1232 | path_kill_slashes(where); | |
1233 | ||
1234 | if (streq(me->mnt_type, "swap")) { | |
1235 | int pri; | |
1236 | ||
1237 | if ((pri = mount_find_pri(me->mnt_opts)) < 0) | |
1238 | r = pri; | |
1239 | else | |
1240 | r = swap_add_one(m, | |
1241 | what, | |
1242 | pri, | |
1243 | !!mount_test_option(me->mnt_opts, MNTOPT_NOAUTO), | |
1244 | !!mount_test_option(me->mnt_opts, "comment=systemd.swapon"), | |
1245 | false); | |
1246 | } else | |
1247 | r = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, false, false); | |
1248 | ||
1249 | free(what); | |
1250 | free(where); | |
1251 | ||
1252 | if (r < 0) | |
1253 | goto finish; | |
1254 | } | |
1255 | ||
1256 | r = 0; | |
1257 | finish: | |
1258 | ||
1259 | endmntent(f); | |
1260 | return r; | |
1261 | } | |
1262 | ||
1263 | static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) { | |
1264 | int r; | |
1265 | char *device, *path, *options, *fstype, *d, *p; | |
1266 | ||
1267 | assert(m); | |
1268 | ||
1269 | rewind(m->proc_self_mountinfo); | |
1270 | ||
1271 | for (;;) { | |
1272 | int k; | |
1273 | ||
1274 | device = path = options = fstype = d = p = NULL; | |
1275 | ||
1276 | if ((k = fscanf(m->proc_self_mountinfo, | |
1277 | "%*s " /* (1) mount id */ | |
1278 | "%*s " /* (2) parent id */ | |
1279 | "%*s " /* (3) major:minor */ | |
1280 | "%*s " /* (4) root */ | |
1281 | "%ms " /* (5) mount point */ | |
1282 | "%ms" /* (6) mount options */ | |
1283 | "%*[^-]" /* (7) optional fields */ | |
1284 | "- " /* (8) seperator */ | |
1285 | "%ms " /* (9) file system type */ | |
1286 | "%ms" /* (10) mount source */ | |
1287 | "%*[^\n]", /* some rubbish at the end */ | |
1288 | &path, | |
1289 | &options, | |
1290 | &fstype, | |
1291 | &device)) != 4) { | |
1292 | ||
1293 | if (k == EOF) | |
1294 | break; | |
1295 | ||
1296 | r = -EBADMSG; | |
1297 | goto finish; | |
1298 | } | |
1299 | ||
1300 | if (!(d = cunescape(device)) || | |
1301 | !(p = cunescape(path))) { | |
1302 | r = -ENOMEM; | |
1303 | goto finish; | |
1304 | } | |
1305 | ||
1306 | if ((r = mount_add_one(m, d, p, options, fstype, true, set_flags)) < 0) | |
1307 | goto finish; | |
1308 | ||
1309 | free(device); | |
1310 | free(path); | |
1311 | free(options); | |
1312 | free(fstype); | |
1313 | free(d); | |
1314 | free(p); | |
1315 | } | |
1316 | ||
1317 | r = 0; | |
1318 | ||
1319 | finish: | |
1320 | free(device); | |
1321 | free(path); | |
1322 | free(options); | |
1323 | free(fstype); | |
1324 | free(d); | |
1325 | free(p); | |
1326 | ||
1327 | return r; | |
1328 | } | |
1329 | ||
1330 | static void mount_shutdown(Manager *m) { | |
1331 | assert(m); | |
1332 | ||
1333 | if (m->proc_self_mountinfo) { | |
1334 | fclose(m->proc_self_mountinfo); | |
1335 | m->proc_self_mountinfo = NULL; | |
1336 | } | |
1337 | } | |
1338 | ||
1339 | static int mount_enumerate(Manager *m) { | |
1340 | int r; | |
1341 | struct epoll_event ev; | |
1342 | assert(m); | |
1343 | ||
1344 | if (!m->proc_self_mountinfo) { | |
1345 | if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "re"))) | |
1346 | return -errno; | |
1347 | ||
1348 | m->mount_watch.type = WATCH_MOUNT; | |
1349 | m->mount_watch.fd = fileno(m->proc_self_mountinfo); | |
1350 | ||
1351 | zero(ev); | |
1352 | ev.events = EPOLLERR; | |
1353 | ev.data.ptr = &m->mount_watch; | |
1354 | ||
1355 | if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0) | |
1356 | return -errno; | |
1357 | } | |
1358 | ||
1359 | if ((r = mount_load_etc_fstab(m)) < 0) | |
1360 | goto fail; | |
1361 | ||
1362 | if ((r = mount_load_proc_self_mountinfo(m, false)) < 0) | |
1363 | goto fail; | |
1364 | ||
1365 | return 0; | |
1366 | ||
1367 | fail: | |
1368 | mount_shutdown(m); | |
1369 | return r; | |
1370 | } | |
1371 | ||
1372 | void mount_fd_event(Manager *m, int events) { | |
1373 | Meta *meta; | |
1374 | int r; | |
1375 | ||
1376 | assert(m); | |
1377 | assert(events == EPOLLERR); | |
1378 | ||
1379 | /* The manager calls this for every fd event happening on the | |
1380 | * /proc/self/mountinfo file, which informs us about mounting | |
1381 | * table changes */ | |
1382 | ||
1383 | if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) { | |
1384 | log_error("Failed to reread /proc/self/mountinfo: %s", strerror(errno)); | |
1385 | ||
1386 | /* Reset flags, just in case, for later calls */ | |
1387 | LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) { | |
1388 | Mount *mount = (Mount*) meta; | |
1389 | ||
1390 | mount->is_mounted = mount->just_mounted = mount->just_changed = false; | |
1391 | } | |
1392 | ||
1393 | return; | |
1394 | } | |
1395 | ||
1396 | manager_dispatch_load_queue(m); | |
1397 | ||
1398 | LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) { | |
1399 | Mount *mount = (Mount*) meta; | |
1400 | ||
1401 | if (!mount->is_mounted) { | |
1402 | /* This has just been unmounted. */ | |
1403 | ||
1404 | mount->from_proc_self_mountinfo = false; | |
1405 | ||
1406 | switch (mount->state) { | |
1407 | ||
1408 | case MOUNT_MOUNTED: | |
1409 | mount_enter_dead(mount, true); | |
1410 | break; | |
1411 | ||
1412 | default: | |
1413 | mount_set_state(mount, mount->state); | |
1414 | break; | |
1415 | ||
1416 | } | |
1417 | ||
1418 | } else if (mount->just_mounted || mount->just_changed) { | |
1419 | ||
1420 | /* New or changed entrymount */ | |
1421 | ||
1422 | switch (mount->state) { | |
1423 | ||
1424 | case MOUNT_DEAD: | |
1425 | case MOUNT_MAINTAINANCE: | |
1426 | mount_enter_mounted(mount, true); | |
1427 | break; | |
1428 | ||
1429 | case MOUNT_MOUNTING: | |
1430 | mount_enter_mounting_done(mount); | |
1431 | break; | |
1432 | ||
1433 | default: | |
1434 | /* Nothing really changed, but let's | |
1435 | * issue an notification call | |
1436 | * nonetheless, in case somebody is | |
1437 | * waiting for this. (e.g. file system | |
1438 | * ro/rw remounts.) */ | |
1439 | mount_set_state(mount, mount->state); | |
1440 | break; | |
1441 | } | |
1442 | } | |
1443 | ||
1444 | /* Reset the flags for later calls */ | |
1445 | mount->is_mounted = mount->just_mounted = mount->just_changed = false; | |
1446 | } | |
1447 | } | |
1448 | ||
1449 | int mount_path_is_mounted(Manager *m, const char* path) { | |
1450 | char *t; | |
1451 | int r; | |
1452 | ||
1453 | assert(m); | |
1454 | assert(path); | |
1455 | ||
1456 | if (path[0] != '/') | |
1457 | return 1; | |
1458 | ||
1459 | if (!(t = strdup(path))) | |
1460 | return -ENOMEM; | |
1461 | ||
1462 | path_kill_slashes(t); | |
1463 | ||
1464 | for (;;) { | |
1465 | char *e, *slash; | |
1466 | Unit *u; | |
1467 | ||
1468 | if (!(e = unit_name_from_path(t, ".mount"))) { | |
1469 | r = -ENOMEM; | |
1470 | goto finish; | |
1471 | } | |
1472 | ||
1473 | u = manager_get_unit(m, e); | |
1474 | free(e); | |
1475 | ||
1476 | if (u && | |
1477 | (MOUNT(u)->from_etc_fstab || MOUNT(u)->from_fragment) && | |
1478 | MOUNT(u)->state != MOUNT_MOUNTED) { | |
1479 | r = 0; | |
1480 | goto finish; | |
1481 | } | |
1482 | ||
1483 | assert_se(slash = strrchr(t, '/')); | |
1484 | ||
1485 | if (slash == t) { | |
1486 | r = 1; | |
1487 | goto finish; | |
1488 | } | |
1489 | ||
1490 | *slash = 0; | |
1491 | } | |
1492 | ||
1493 | r = 1; | |
1494 | ||
1495 | finish: | |
1496 | free(t); | |
1497 | return r; | |
1498 | } | |
1499 | ||
1500 | static const char* const mount_state_table[_MOUNT_STATE_MAX] = { | |
1501 | [MOUNT_DEAD] = "dead", | |
1502 | [MOUNT_MOUNTING] = "mounting", | |
1503 | [MOUNT_MOUNTING_DONE] = "mounting-done", | |
1504 | [MOUNT_MOUNTED] = "mounted", | |
1505 | [MOUNT_REMOUNTING] = "remounting", | |
1506 | [MOUNT_UNMOUNTING] = "unmounting", | |
1507 | [MOUNT_MOUNTING_SIGTERM] = "mounting-sigterm", | |
1508 | [MOUNT_MOUNTING_SIGKILL] = "mounting-sigkill", | |
1509 | [MOUNT_REMOUNTING_SIGTERM] = "remounting-sigterm", | |
1510 | [MOUNT_REMOUNTING_SIGKILL] = "remounting-sigkill", | |
1511 | [MOUNT_UNMOUNTING_SIGTERM] = "unmounting-sigterm", | |
1512 | [MOUNT_UNMOUNTING_SIGKILL] = "unmounting-sigkill", | |
1513 | [MOUNT_MAINTAINANCE] = "maintainance" | |
1514 | }; | |
1515 | ||
1516 | DEFINE_STRING_TABLE_LOOKUP(mount_state, MountState); | |
1517 | ||
1518 | static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = { | |
1519 | [MOUNT_EXEC_MOUNT] = "ExecMount", | |
1520 | [MOUNT_EXEC_UNMOUNT] = "ExecUnmount", | |
1521 | [MOUNT_EXEC_REMOUNT] = "ExecRemount", | |
1522 | }; | |
1523 | ||
1524 | DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand); | |
1525 | ||
1526 | const UnitVTable mount_vtable = { | |
1527 | .suffix = ".mount", | |
1528 | ||
1529 | .no_alias = true, | |
1530 | .no_instances = true, | |
1531 | .no_isolate = true, | |
1532 | ||
1533 | .init = mount_init, | |
1534 | .load = mount_load, | |
1535 | .done = mount_done, | |
1536 | ||
1537 | .coldplug = mount_coldplug, | |
1538 | ||
1539 | .dump = mount_dump, | |
1540 | ||
1541 | .start = mount_start, | |
1542 | .stop = mount_stop, | |
1543 | .reload = mount_reload, | |
1544 | ||
1545 | .serialize = mount_serialize, | |
1546 | .deserialize_item = mount_deserialize_item, | |
1547 | ||
1548 | .active_state = mount_active_state, | |
1549 | .sub_state_to_string = mount_sub_state_to_string, | |
1550 | ||
1551 | .check_gc = mount_check_gc, | |
1552 | ||
1553 | .sigchld_event = mount_sigchld_event, | |
1554 | .timer_event = mount_timer_event, | |
1555 | ||
1556 | .bus_message_handler = bus_mount_message_handler, | |
1557 | ||
1558 | .enumerate = mount_enumerate, | |
1559 | .shutdown = mount_shutdown | |
1560 | }; |