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