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