chiark / gitweb /
597df9e614fe289893a501247da57ad5cc6a3f8d
[elogind.git] / mount.c
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
37 static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
38         [MOUNT_DEAD] = UNIT_INACTIVE,
39         [MOUNT_MOUNTING] = UNIT_ACTIVATING,
40         [MOUNT_MOUNTING_DONE] = UNIT_ACTIVE,
41         [MOUNT_MOUNTED] = UNIT_ACTIVE,
42         [MOUNT_REMOUNTING] = UNIT_ACTIVE_RELOADING,
43         [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
44         [MOUNT_MOUNTING_SIGTERM] = UNIT_DEACTIVATING,
45         [MOUNT_MOUNTING_SIGKILL] = UNIT_DEACTIVATING,
46         [MOUNT_REMOUNTING_SIGTERM] = UNIT_ACTIVE_RELOADING,
47         [MOUNT_REMOUNTING_SIGKILL] = UNIT_ACTIVE_RELOADING,
48         [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
49         [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
50         [MOUNT_MAINTAINANCE] = UNIT_INACTIVE,
51 };
52
53 static const char* const state_string_table[_MOUNT_STATE_MAX] = {
54         [MOUNT_DEAD] = "dead",
55         [MOUNT_MOUNTING] = "mounting",
56         [MOUNT_MOUNTING_DONE] = "mounting-done",
57         [MOUNT_MOUNTED] = "mounted",
58         [MOUNT_REMOUNTING] = "remounting",
59         [MOUNT_UNMOUNTING] = "unmounting",
60         [MOUNT_MOUNTING_SIGTERM] = "mounting-sigterm",
61         [MOUNT_MOUNTING_SIGKILL] = "mounting-sigkill",
62         [MOUNT_REMOUNTING_SIGTERM] = "remounting-sigterm",
63         [MOUNT_REMOUNTING_SIGKILL] = "remounting-sigkill",
64         [MOUNT_UNMOUNTING_SIGTERM] = "unmounting-sigterm",
65         [MOUNT_UNMOUNTING_SIGKILL] = "unmounting-sigkill",
66         [MOUNT_MAINTAINANCE] = "maintainance"
67 };
68
69 static void service_unwatch_control_pid(Mount *m) {
70         assert(m);
71
72         if (m->control_pid <= 0)
73                 return;
74
75         unit_unwatch_pid(UNIT(m), m->control_pid);
76         m->control_pid = 0;
77 }
78
79 static void mount_parameters_done(MountParameters *p) {
80         assert(p);
81
82         free(p->what);
83         free(p->options);
84         free(p->fstype);
85
86         p->what = p->options = p->fstype = NULL;
87 }
88
89 static void mount_done(Unit *u) {
90         Mount *m = MOUNT(u);
91
92         assert(m);
93
94         free(m->where);
95         m->where = NULL;
96
97         mount_parameters_done(&m->parameters_etc_fstab);
98         mount_parameters_done(&m->parameters_proc_self_mountinfo);
99         mount_parameters_done(&m->parameters_fragment);
100
101         exec_context_done(&m->exec_context);
102         exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
103         m->control_command = NULL;
104
105         service_unwatch_control_pid(m);
106
107         unit_unwatch_timer(u, &m->timer_watch);
108 }
109
110 static void mount_init(Unit *u) {
111         Mount *m = MOUNT(u);
112
113         assert(u);
114         assert(u->meta.load_state == UNIT_STUB);
115
116         m->state = 0;
117         m->from_etc_fstab = false;
118         m->from_proc_self_mountinfo = false;
119         m->from_fragment = false;
120
121         m->is_mounted = false;
122         m->just_mounted = false;
123         m->just_changed = false;
124
125         m->timeout_usec = DEFAULT_TIMEOUT_USEC;
126
127         zero(m->exec_command);
128         exec_context_init(&m->exec_context);
129
130         m->kill_mode = 0;
131
132         m->control_pid = 0;
133         m->failure = false;
134
135         m->timer_watch.type = WATCH_INVALID;
136 }
137
138 static int mount_add_node_links(Mount *m) {
139         Unit *device;
140         char *e;
141         int r;
142         const char *what;
143
144         assert(m);
145
146         /* Adds in links to the device that this node is based on */
147
148         if (m->parameters_fragment.what)
149                 what = m->parameters_fragment.what;
150         else if (m->parameters_etc_fstab.what)
151                 what = m->parameters_etc_fstab.what;
152         else
153                 /* We observe kernel mounts only while they are live,
154                  * hence don't create any links for them */
155                 return 0;
156
157         if (!path_startswith(what, "/dev/"))
158                 return 0;
159
160         if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
161                 return -ENOMEM;
162
163         r = manager_load_unit(UNIT(m)->meta.manager, e, NULL, &device);
164         free(e);
165
166         if (r < 0)
167                 return r;
168
169         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, device)) < 0)
170                 return r;
171
172         if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, device)) < 0)
173                 return r;
174
175         if (UNIT(m)->meta.manager->running_as == MANAGER_INIT ||
176             UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM)
177                 if ((r = unit_add_dependency(device, UNIT_WANTS, UNIT(m))) < 0)
178                         return r;
179
180         return 0;
181 }
182
183 static int mount_add_path_links(Mount *m) {
184         Meta *other;
185         int r;
186
187         assert(m);
188
189         /* Adds in link to other mount points, that might lie below or
190          * above us in the hierarchy */
191
192         LIST_FOREACH(units_per_type, other, UNIT(m)->meta.manager->units_per_type[UNIT_MOUNT]) {
193                 Mount *n;
194
195                 n = (Mount*) other;
196
197                 if (n == m)
198                         continue;
199
200                 if (m->meta.load_state != UNIT_LOADED)
201                         continue;
202
203                 if (path_startswith(m->where, n->where)) {
204
205                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(other))) < 0)
206                                 return r;
207
208                         if (n->from_etc_fstab || n->from_fragment)
209                                 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(other))) < 0)
210                                         return r;
211
212                 } else if (path_startswith(n->where, m->where)) {
213
214                         if ((r = unit_add_dependency(UNIT(m), UNIT_BEFORE, UNIT(other))) < 0)
215                                 return r;
216
217                         if (m->from_etc_fstab || m->from_fragment)
218                                 if ((r = unit_add_dependency(UNIT(other), UNIT_REQUIRES, UNIT(m))) < 0)
219                                         return r;
220                 }
221         }
222
223         return 0;
224 }
225
226 static bool mount_test_option(const char *haystack, const char *needle) {
227         struct mntent me;
228
229         assert(needle);
230
231         /* Like glibc's hasmntopt(), but works on a string, not a
232          * struct mntent */
233
234         if (!haystack)
235                 return false;
236
237         zero(me);
238         me.mnt_opts = (char*) haystack;
239
240         return !!hasmntopt(&me, needle);
241 }
242
243 static int mount_add_target_links(Mount *m) {
244         const char *target;
245         MountParameters *p;
246         Unit *u;
247         int r;
248         bool noauto;
249         bool handle;
250
251         assert(m);
252
253         if (m->from_fragment)
254                 p = &m->parameters_fragment;
255         else if (m->from_etc_fstab)
256                 p = &m->parameters_etc_fstab;
257         else
258                 return 0;
259
260         noauto = mount_test_option(p->options, MNTOPT_NOAUTO);
261         handle = mount_test_option(p->options, "comment=systemd.mount");
262
263         if (noauto && !handle)
264                 return 0;
265
266         if (mount_test_option(p->options, "_netdev") ||
267             fstype_is_network(p->fstype))
268                 target = SPECIAL_REMOTE_FS_TARGET;
269         else
270                 target = SPECIAL_LOCAL_FS_TARGET;
271
272         if ((r = manager_load_unit(UNIT(m)->meta.manager, target, NULL, &u)) < 0)
273                 return r;
274
275         if (handle)
276                 if ((r = unit_add_dependency(u, UNIT_WANTS, UNIT(m))) < 0)
277                         return r;
278
279         return unit_add_dependency(UNIT(m), UNIT_BEFORE, u);
280 }
281
282 static int mount_load(Unit *u) {
283         Mount *m = MOUNT(u);
284         int r;
285
286         assert(u);
287         assert(u->meta.load_state == UNIT_STUB);
288
289         if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
290                 return r;
291
292         /* This is a new unit? Then let's add in some extras */
293         if (u->meta.load_state == UNIT_LOADED) {
294
295                 /* Minor validity checking */
296                 if ((m->parameters_fragment.options || m->parameters_fragment.fstype) && !m->parameters_fragment.what)
297                         return -EBADMSG;
298
299                 if (m->parameters_fragment.what)
300                         m->from_fragment = true;
301
302                 if ((r = mount_add_node_links(MOUNT(u))) < 0)
303                         return r;
304
305                 if ((r = mount_add_path_links(MOUNT(u))) < 0)
306                         return r;
307
308                 if ((r = mount_add_target_links(MOUNT(u))) < 0)
309                         return r;
310
311                 if ((r = unit_add_default_cgroup(u)) < 0)
312                         return r;
313         }
314
315         return 0;
316 }
317
318 static void mount_set_state(Mount *m, MountState state) {
319         MountState old_state;
320         assert(m);
321
322         old_state = m->state;
323         m->state = state;
324
325         if (state != MOUNT_MOUNTING &&
326             state != MOUNT_MOUNTING_DONE &&
327             state != MOUNT_REMOUNTING &&
328             state != MOUNT_UNMOUNTING &&
329             state != MOUNT_MOUNTING_SIGTERM &&
330             state != MOUNT_MOUNTING_SIGKILL &&
331             state != MOUNT_UNMOUNTING_SIGTERM &&
332             state != MOUNT_UNMOUNTING_SIGKILL &&
333             state != MOUNT_REMOUNTING_SIGTERM &&
334             state != MOUNT_REMOUNTING_SIGKILL) {
335                 unit_unwatch_timer(UNIT(m), &m->timer_watch);
336                 service_unwatch_control_pid(m);
337                 m->control_command = NULL;
338         }
339
340         if (state != old_state)
341                 log_debug("%s changed %s → %s", UNIT(m)->meta.id, state_string_table[old_state], state_string_table[state]);
342
343         unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state]);
344 }
345
346 static int mount_coldplug(Unit *u) {
347         Mount *m = MOUNT(u);
348
349         assert(m);
350         assert(m->state == MOUNT_DEAD);
351
352         if (m->from_proc_self_mountinfo)
353                 mount_set_state(m, MOUNT_MOUNTED);
354
355         return 0;
356 }
357
358 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
359         pid_t pid;
360         int r;
361
362         assert(m);
363         assert(c);
364         assert(_pid);
365
366         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
367                 goto fail;
368
369         if ((r = exec_spawn(c,
370                             NULL,
371                             &m->exec_context,
372                             NULL, 0,
373                             true,
374                             true,
375                             UNIT(m)->meta.manager->confirm_spawn,
376                             UNIT(m)->meta.cgroup_bondings,
377                             &pid)) < 0)
378                 goto fail;
379
380         if ((r = unit_watch_pid(UNIT(m), pid)) < 0)
381                 /* FIXME: we need to do something here */
382                 goto fail;
383
384         *_pid = pid;
385
386         return 0;
387
388 fail:
389         unit_unwatch_timer(UNIT(m), &m->timer_watch);
390
391         return r;
392 }
393
394 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
395         Mount *m = MOUNT(u);
396         MountParameters *p;
397
398         assert(m);
399         assert(f);
400
401         if (m->from_proc_self_mountinfo)
402                 p = &m->parameters_proc_self_mountinfo;
403         else if (m->from_fragment)
404                 p = &m->parameters_fragment;
405         else
406                 p = &m->parameters_etc_fstab;
407
408         fprintf(f,
409                 "%sMount State: %s\n"
410                 "%sWhere: %s\n"
411                 "%sWhat: %s\n"
412                 "%sFile System Type: %s\n"
413                 "%sOptions: %s\n"
414                 "%sFrom /etc/fstab: %s\n"
415                 "%sFrom /proc/self/mountinfo: %s\n"
416                 "%sFrom fragment: %s\n"
417                 "%sKillMode: %s\n",
418                 prefix, state_string_table[m->state],
419                 prefix, m->where,
420                 prefix, strna(p->what),
421                 prefix, strna(p->fstype),
422                 prefix, strna(p->options),
423                 prefix, yes_no(m->from_etc_fstab),
424                 prefix, yes_no(m->from_proc_self_mountinfo),
425                 prefix, yes_no(m->from_fragment),
426                 prefix, kill_mode_to_string(m->kill_mode));
427
428         if (m->control_pid > 0)
429                 fprintf(f,
430                         "%sControl PID: %llu\n",
431                         prefix, (unsigned long long) m->control_pid);
432
433         exec_context_dump(&m->exec_context, f, prefix);
434 }
435
436 static void mount_enter_dead(Mount *m, bool success) {
437         assert(m);
438
439         if (!success)
440                 m->failure = true;
441
442         mount_set_state(m, m->failure ? MOUNT_MAINTAINANCE : MOUNT_DEAD);
443 }
444
445 static void mount_enter_mounted(Mount *m, bool success) {
446         assert(m);
447
448         if (!success)
449                 m->failure = true;
450
451         mount_set_state(m, MOUNT_MOUNTED);
452 }
453
454 static void mount_enter_signal(Mount *m, MountState state, bool success) {
455         int r;
456         bool sent = false;
457
458         assert(m);
459
460         if (!success)
461                 m->failure = true;
462
463         if (m->kill_mode != KILL_NONE) {
464                 int sig = (state == MOUNT_MOUNTING_SIGTERM ||
465                            state == MOUNT_UNMOUNTING_SIGTERM ||
466                            state == MOUNT_REMOUNTING_SIGTERM) ? SIGTERM : SIGKILL;
467
468                 if (m->kill_mode == KILL_CONTROL_GROUP) {
469
470                         if ((r = cgroup_bonding_kill_list(UNIT(m)->meta.cgroup_bondings, sig)) < 0) {
471                                 if (r != -EAGAIN && r != -ESRCH)
472                                         goto fail;
473                         } else
474                                 sent = true;
475                 }
476
477                 if (!sent && m->control_pid > 0)
478                         if (kill(m->kill_mode == KILL_PROCESS ? m->control_pid : -m->control_pid, sig) < 0 && errno != ESRCH) {
479                                 r = -errno;
480                                 goto fail;
481                         }
482         }
483
484         if (sent) {
485                 if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
486                         goto fail;
487
488                 mount_set_state(m, state);
489         } else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
490                 mount_enter_mounted(m, true);
491         else
492                 mount_enter_dead(m, true);
493
494         return;
495
496 fail:
497         log_warning("%s failed to kill processes: %s", UNIT(m)->meta.id, strerror(-r));
498
499         if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
500                 mount_enter_mounted(m, false);
501         else
502                 mount_enter_dead(m, false);
503 }
504
505 static void mount_enter_unmounting(Mount *m, bool success) {
506         ExecCommand *c;
507         int r;
508
509         assert(m);
510
511         if (!success)
512                 m->failure = true;
513
514         m->control_command = c = m->exec_command + MOUNT_EXEC_UNMOUNT;
515
516         if ((r = exec_command_set(
517                              c,
518                              "/bin/umount",
519                              m->where,
520                              NULL)) < 0)
521                 goto fail;
522
523         service_unwatch_control_pid(m);
524
525         if ((r = mount_spawn(m, c, &m->control_pid)) < 0)
526                 goto fail;
527
528         mount_set_state(m, MOUNT_UNMOUNTING);
529
530         return;
531
532 fail:
533         log_warning("%s failed to run umount exectuable: %s", UNIT(m)->meta.id, strerror(-r));
534         mount_enter_mounted(m, false);
535 }
536
537 static void mount_enter_mounting(Mount *m, bool success) {
538         ExecCommand *c;
539         int r;
540
541         assert(m);
542
543         if (!success)
544                 m->failure = true;
545
546         m->control_command = c = m->exec_command + MOUNT_EXEC_MOUNT;
547
548         if (m->from_fragment)
549                 r = exec_command_set(
550                                 c,
551                                 "/bin/mount",
552                                 m->parameters_fragment.what,
553                                 m->where,
554                                 "-t", m->parameters_fragment.fstype,
555                                 "-o", m->parameters_fragment.options,
556                                 NULL);
557         else if (m->from_etc_fstab)
558                 r = exec_command_set(
559                                 c,
560                                 "/bin/mount",
561                                 m->where,
562                                 NULL);
563         else
564                 r = -ENOENT;
565
566         if (r < 0)
567                 goto fail;
568
569         service_unwatch_control_pid(m);
570
571         if ((r = mount_spawn(m, c, &m->control_pid)) < 0)
572                 goto fail;
573
574         mount_set_state(m, MOUNT_MOUNTING);
575
576         return;
577
578 fail:
579         log_warning("%s failed to run mount exectuable: %s", UNIT(m)->meta.id, strerror(-r));
580         mount_enter_dead(m, false);
581 }
582
583 static void mount_enter_mounting_done(Mount *m, bool success) {
584         assert(m);
585
586         if (!success)
587                 m->failure = true;
588
589         mount_set_state(m, MOUNT_MOUNTING_DONE);
590 }
591
592 static void mount_enter_remounting(Mount *m, bool success) {
593         ExecCommand *c;
594         int r;
595
596         assert(m);
597
598         if (!success)
599                 m->failure = true;
600
601         m->control_command = c = m->exec_command + MOUNT_EXEC_REMOUNT;
602
603         if (m->from_fragment) {
604                 char *buf = NULL;
605                 const char *o;
606
607                 if (m->parameters_fragment.options) {
608                         if (!(buf = strappend("remount,", m->parameters_fragment.options))) {
609                                 r = -ENOMEM;
610                                 goto fail;
611                         }
612
613                         o = buf;
614                 } else
615                         o = "remount";
616
617                 r = exec_command_set(
618                                 c,
619                                 "/bin/mount",
620                                 m->parameters_fragment.what,
621                                 m->where,
622                                 "-t", m->parameters_fragment.fstype,
623                                 "-o", o,
624                                 NULL);
625
626                 free(buf);
627         } else if (m->from_etc_fstab)
628                 r = exec_command_set(
629                                 c,
630                                 "/bin/mount",
631                                 m->where,
632                                 "-o", "remount",
633                                 NULL);
634         else
635                 r = -ENOENT;
636
637         if (r < 0) {
638                 r = -ENOMEM;
639                 goto fail;
640         }
641
642         service_unwatch_control_pid(m);
643
644         if ((r = mount_spawn(m, c, &m->control_pid)) < 0)
645                 goto fail;
646
647         mount_set_state(m, MOUNT_REMOUNTING);
648
649         return;
650
651 fail:
652         mount_enter_mounted(m, false);
653 }
654
655 static int mount_start(Unit *u) {
656         Mount *m = MOUNT(u);
657
658         assert(m);
659
660         /* We cannot fulfill this request right now, try again later
661          * please! */
662         if (m->state == MOUNT_UNMOUNTING ||
663             m->state == MOUNT_UNMOUNTING_SIGTERM ||
664             m->state == MOUNT_UNMOUNTING_SIGKILL)
665                 return -EAGAIN;
666
667         /* Already on it! */
668         if (m->state == MOUNT_MOUNTING ||
669             m->state == MOUNT_MOUNTING_SIGTERM ||
670             m->state == MOUNT_MOUNTING_SIGKILL)
671                 return 0;
672
673         assert(m->state == MOUNT_DEAD || m->state == MOUNT_MAINTAINANCE);
674
675         m->failure = false;
676
677         mount_enter_mounting(m, true);
678         return 0;
679 }
680
681 static int mount_stop(Unit *u) {
682         Mount *m = MOUNT(u);
683
684         assert(m);
685
686         /* Cann't do this right now. */
687         if (m->state == MOUNT_MOUNTING ||
688             m->state == MOUNT_MOUNTING_DONE ||
689             m->state == MOUNT_MOUNTING_SIGTERM ||
690             m->state == MOUNT_MOUNTING_SIGKILL ||
691             m->state == MOUNT_REMOUNTING ||
692             m->state == MOUNT_REMOUNTING_SIGTERM ||
693             m->state == MOUNT_REMOUNTING_SIGKILL)
694                 return -EAGAIN;
695
696         /* Already on it */
697         if (m->state == MOUNT_UNMOUNTING ||
698             m->state == MOUNT_UNMOUNTING_SIGKILL ||
699             m->state == MOUNT_UNMOUNTING_SIGTERM)
700                 return 0;
701
702         assert(m->state == MOUNT_MOUNTED);
703
704         mount_enter_unmounting(m, true);
705         return 0;
706 }
707
708 static int mount_reload(Unit *u) {
709         Mount *m = MOUNT(u);
710
711         assert(m);
712
713         if (m->state == MOUNT_MOUNTING_DONE)
714                 return -EAGAIN;
715
716         assert(m->state == MOUNT_MOUNTED);
717
718         mount_enter_remounting(m, true);
719         return 0;
720 }
721
722 static UnitActiveState mount_active_state(Unit *u) {
723         assert(u);
724
725         return state_translation_table[MOUNT(u)->state];
726 }
727
728 static const char *mount_sub_state_to_string(Unit *u) {
729         assert(u);
730
731         return state_string_table[MOUNT(u)->state];
732 }
733
734 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
735         Mount *m = MOUNT(u);
736         bool success;
737
738         assert(m);
739         assert(pid >= 0);
740
741         success = code == CLD_EXITED && status == 0;
742         m->failure = m->failure || !success;
743
744         assert(m->control_pid == pid);
745         assert(m->control_command);
746
747         exec_status_fill(&m->control_command->exec_status, pid, code, status);
748         m->control_pid = 0;
749
750         log_debug("%s control process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
751
752         /* Note that mount(8) returning and the kernel sending us a
753          * mount table change event might happen out-of-order. If an
754          * operation succeed we assume the kernel will follow soon too
755          * and already change into the resulting state.  If it fails
756          * we check if the kernel still knows about the mount. and
757          * change state accordingly. */
758
759         switch (m->state) {
760
761         case MOUNT_MOUNTING:
762         case MOUNT_MOUNTING_DONE:
763         case MOUNT_MOUNTING_SIGKILL:
764         case MOUNT_MOUNTING_SIGTERM:
765         case MOUNT_REMOUNTING:
766         case MOUNT_REMOUNTING_SIGKILL:
767         case MOUNT_REMOUNTING_SIGTERM:
768
769                 if (success && m->from_proc_self_mountinfo)
770                         mount_enter_mounted(m, true);
771                 else if (m->from_proc_self_mountinfo)
772                         mount_enter_mounted(m, false);
773                 else
774                         mount_enter_dead(m, false);
775                 break;
776
777         case MOUNT_UNMOUNTING:
778         case MOUNT_UNMOUNTING_SIGKILL:
779         case MOUNT_UNMOUNTING_SIGTERM:
780
781                 if (success)
782                         mount_enter_dead(m, true);
783                 else if (m->from_proc_self_mountinfo)
784                         mount_enter_mounted(m, false);
785                 else
786                         mount_enter_dead(m, false);
787                 break;
788
789         default:
790                 assert_not_reached("Uh, control process died at wrong time.");
791         }
792 }
793
794 static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
795         Mount *m = MOUNT(u);
796
797         assert(m);
798         assert(elapsed == 1);
799         assert(w == &m->timer_watch);
800
801         switch (m->state) {
802
803         case MOUNT_MOUNTING:
804         case MOUNT_MOUNTING_DONE:
805                 log_warning("%s mounting timed out. Stopping.", u->meta.id);
806                 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false);
807                 break;
808
809         case MOUNT_REMOUNTING:
810                 log_warning("%s remounting timed out. Stopping.", u->meta.id);
811                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, false);
812                 break;
813
814         case MOUNT_UNMOUNTING:
815                 log_warning("%s unmounting timed out. Stopping.", u->meta.id);
816                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false);
817                 break;
818
819         case MOUNT_MOUNTING_SIGTERM:
820                 log_warning("%s mounting timed out. Killing.", u->meta.id);
821                 mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false);
822                 break;
823
824         case MOUNT_REMOUNTING_SIGTERM:
825                 log_warning("%s remounting timed out. Killing.", u->meta.id);
826                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false);
827                 break;
828
829         case MOUNT_UNMOUNTING_SIGTERM:
830                 log_warning("%s unmounting timed out. Killing.", u->meta.id);
831                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false);
832                 break;
833
834         case MOUNT_MOUNTING_SIGKILL:
835         case MOUNT_REMOUNTING_SIGKILL:
836         case MOUNT_UNMOUNTING_SIGKILL:
837                 log_warning("%s mount process still around after SIGKILL. Ignoring.", u->meta.id);
838
839                 if (m->from_proc_self_mountinfo)
840                         mount_enter_mounted(m, false);
841                 else
842                         mount_enter_dead(m, false);
843                 break;
844
845         default:
846                 assert_not_reached("Timeout at wrong time.");
847         }
848 }
849
850 static int mount_add_one(
851                 Manager *m,
852                 const char *what,
853                 const char *where,
854                 const char *options,
855                 const char *fstype,
856                 bool from_proc_self_mountinfo,
857                 bool set_flags) {
858         int r;
859         Unit *u;
860         bool delete;
861         char *e, *w = NULL, *o = NULL, *f = NULL;
862         MountParameters *mp;
863
864         assert(m);
865         assert(what);
866         assert(where);
867         assert(options);
868         assert(fstype);
869
870         assert(!set_flags || from_proc_self_mountinfo);
871
872         /* Ignore API mount points. They should never be referenced in
873          * dependencies ever. */
874         if (mount_point_is_api(where))
875                 return 0;
876
877         /* probably some kind of swap, which we don't cover for now */
878         if (where[0] != '/')
879                 return 0;
880
881         if (streq(where, "/"))
882                 e = strdup("-.mount");
883         else
884                 e = unit_name_build_escape(where+1, NULL, ".mount");
885
886         if (!e)
887                 return -ENOMEM;
888
889         if (!(u = manager_get_unit(m, e))) {
890                 delete = true;
891
892                 if (!(u = unit_new(m))) {
893                         free(e);
894                         return -ENOMEM;
895                 }
896
897                 r = unit_add_name(u, e);
898                 free(e);
899
900                 if (r < 0)
901                         goto fail;
902
903                 if (!(MOUNT(u)->where = strdup(where))) {
904                             r = -ENOMEM;
905                             goto fail;
906                     }
907
908                 if ((r = unit_set_description(u, where)) < 0)
909                         goto fail;
910
911                 unit_add_to_load_queue(u);
912         } else {
913                 delete = false;
914                 free(e);
915         }
916
917         if (!(w = strdup(what)) ||
918             !(o = strdup(options)) ||
919             !(f = strdup(fstype))) {
920                 r = -ENOMEM;
921                 goto fail;
922         }
923
924         if (from_proc_self_mountinfo) {
925                 mp = &MOUNT(u)->parameters_proc_self_mountinfo;
926
927                 if (set_flags) {
928                         MOUNT(u)->is_mounted = true;
929                         MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
930                         MOUNT(u)->just_changed = !streq_ptr(MOUNT(u)->parameters_proc_self_mountinfo.options, o);
931                 }
932
933                 MOUNT(u)->from_proc_self_mountinfo = true;
934
935         } else {
936                 mp = &MOUNT(u)->parameters_etc_fstab;
937
938                 MOUNT(u)->from_etc_fstab = true;
939         }
940
941         free(mp->what);
942         mp->what = w;
943
944         free(mp->options);
945         mp->options = o;
946
947         free(mp->fstype);
948         mp->fstype = f;
949
950         unit_add_to_dbus_queue(u);
951
952         return 0;
953
954 fail:
955         free(w);
956         free(o);
957         free(f);
958
959         if (delete && u)
960                 unit_free(u);
961
962         return 0;
963 }
964
965 static char *fstab_node_to_udev_node(char *p) {
966         char *dn, *t;
967         int r;
968
969         /* FIXME: to follow udev's logic 100% we need to leave valid
970          * UTF8 chars unescaped */
971
972         if (startswith(p, "LABEL=")) {
973
974                 if (!(t = xescape(p+6, "/ ")))
975                         return NULL;
976
977                 r = asprintf(&dn, "/dev/disk/by-label/%s", t);
978                 free(t);
979
980                 if (r < 0)
981                         return NULL;
982
983                 return dn;
984         }
985
986         if (startswith(p, "UUID=")) {
987
988                 if (!(t = xescape(p+5, "/ ")))
989                         return NULL;
990
991                 r = asprintf(&dn, "/dev/disk/by-uuid/%s", ascii_strlower(t));
992                 free(t);
993
994                 if (r < 0)
995                         return NULL;
996
997                 return dn;
998         }
999
1000         return strdup(p);
1001 }
1002
1003 static int mount_load_etc_fstab(Manager *m) {
1004         FILE *f;
1005         int r;
1006         struct mntent* me;
1007
1008         assert(m);
1009
1010         errno = 0;
1011         if (!(f = setmntent("/etc/fstab", "r")))
1012                 return -errno;
1013
1014         while ((me = getmntent(f))) {
1015                 char *where, *what;
1016
1017                 if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
1018                         r = -ENOMEM;
1019                         goto finish;
1020                 }
1021
1022                 if (!(where = strdup(me->mnt_dir))) {
1023                         free(what);
1024                         r = -ENOMEM;
1025                         goto finish;
1026                 }
1027
1028                 if (what[0] == '/')
1029                         path_kill_slashes(what);
1030
1031                 if (where[0] == '/')
1032                         path_kill_slashes(where);
1033
1034                 r = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, false, false);
1035                 free(what);
1036                 free(where);
1037
1038                 if (r < 0)
1039                         goto finish;
1040         }
1041
1042         r = 0;
1043 finish:
1044
1045         endmntent(f);
1046         return r;
1047 }
1048
1049 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1050         int r;
1051         char *device, *path, *options, *fstype, *d, *p;
1052
1053         assert(m);
1054
1055         rewind(m->proc_self_mountinfo);
1056
1057         for (;;) {
1058                 int k;
1059
1060                 device = path = options = fstype = d = p = NULL;
1061
1062                 if ((k = fscanf(m->proc_self_mountinfo,
1063                                 "%*s "       /* (1) mount id */
1064                                 "%*s "       /* (2) parent id */
1065                                 "%*s "       /* (3) major:minor */
1066                                 "%*s "       /* (4) root */
1067                                 "%ms "       /* (5) mount point */
1068                                 "%ms"        /* (6) mount options */
1069                                 "%*[^-]"     /* (7) optional fields */
1070                                 "- "         /* (8) seperator */
1071                                 "%ms "       /* (9) file system type */
1072                                 "%ms"        /* (10) mount source */
1073                                 "%*[^\n]",   /* some rubbish at the end */
1074                                 &path,
1075                                 &options,
1076                                 &fstype,
1077                                 &device)) != 4) {
1078
1079                         if (k == EOF)
1080                                 break;
1081
1082                         r = -EBADMSG;
1083                         goto finish;
1084                 }
1085
1086                 if (!(d = cunescape(device)) ||
1087                     !(p = cunescape(path))) {
1088                         r = -ENOMEM;
1089                         goto finish;
1090                 }
1091
1092                 if ((r = mount_add_one(m, d, p, options, fstype, true, set_flags)) < 0)
1093                         goto finish;
1094
1095                 free(device);
1096                 free(path);
1097                 free(options);
1098                 free(fstype);
1099                 free(d);
1100                 free(p);
1101         }
1102
1103         r = 0;
1104
1105 finish:
1106         free(device);
1107         free(path);
1108         free(options);
1109         free(fstype);
1110         free(d);
1111         free(p);
1112
1113         return r;
1114 }
1115
1116 static void mount_shutdown(Manager *m) {
1117         assert(m);
1118
1119         if (m->proc_self_mountinfo)
1120                 fclose(m->proc_self_mountinfo);
1121 }
1122
1123 static int mount_enumerate(Manager *m) {
1124         int r;
1125         struct epoll_event ev;
1126         assert(m);
1127
1128         if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "r")))
1129                 return -errno;
1130
1131         m->mount_watch.type = WATCH_MOUNT;
1132         m->mount_watch.fd = fileno(m->proc_self_mountinfo);
1133
1134         zero(ev);
1135         ev.events = EPOLLERR;
1136         ev.data.ptr = &m->mount_watch;
1137
1138         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
1139                 return -errno;
1140
1141         if ((r = mount_load_etc_fstab(m)) < 0)
1142                 goto fail;
1143
1144         if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
1145                 goto fail;
1146
1147         return 0;
1148
1149 fail:
1150         mount_shutdown(m);
1151         return r;
1152 }
1153
1154 void mount_fd_event(Manager *m, int events) {
1155         Meta *meta;
1156         int r;
1157
1158         assert(m);
1159         assert(events == EPOLLERR);
1160
1161         /* The manager calls this for every fd event happening on the
1162          * /proc/self/mountinfo file, which informs us about mounting
1163          * table changes */
1164
1165         if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
1166                 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-errno));
1167
1168                 /* Reset flags, just in case, for later calls */
1169                 LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1170                         Mount *mount = (Mount*) meta;
1171
1172                         mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1173                 }
1174
1175                 return;
1176         }
1177
1178         manager_dispatch_load_queue(m);
1179
1180         LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1181                 Mount *mount = (Mount*) meta;
1182
1183                 if (!mount->is_mounted) {
1184                         /* This has just been unmounted. */
1185
1186                         mount->from_proc_self_mountinfo = false;
1187
1188                         switch (mount->state) {
1189
1190                         case MOUNT_MOUNTED:
1191                                 mount_enter_dead(mount, true);
1192                                 break;
1193
1194                         default:
1195                                 mount_set_state(mount, mount->state);
1196                                 break;
1197
1198                         }
1199
1200                 } else if (mount->just_mounted || mount->just_changed) {
1201
1202                         /* New or changed entrymount */
1203
1204                         switch (mount->state) {
1205
1206                         case MOUNT_DEAD:
1207                         case MOUNT_MAINTAINANCE:
1208                                 mount_enter_mounted(mount, true);
1209                                 break;
1210
1211                         case MOUNT_MOUNTING:
1212                                 mount_enter_mounting_done(mount, true);
1213                                 break;
1214
1215                         default:
1216                                 /* Nothing really changed, but let's
1217                                  * issue an notification call
1218                                  * nonetheless, in case somebody is
1219                                  * waiting for this. (e.g. file system
1220                                  * ro/rw remounts.) */
1221                                 mount_set_state(mount, mount->state);
1222                                 break;
1223                         }
1224                 }
1225
1226                 /* Reset the flags for later calls */
1227                 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1228         }
1229 }
1230
1231 int mount_path_is_mounted(Manager *m, const char* path) {
1232         char *t;
1233         int r;
1234
1235         assert(m);
1236         assert(path);
1237
1238         if (path[0] != '/')
1239                 return 1;
1240
1241         if (!(t = strdup(path)))
1242                 return -ENOMEM;
1243
1244         path_kill_slashes(t);
1245
1246         for (;;) {
1247                 char *e, *slash;
1248                 Unit *u;
1249
1250                 if (!(e = unit_name_build_escape(t+1, NULL, ".mount"))) {
1251                         r = -ENOMEM;
1252                         goto finish;
1253                 }
1254
1255                 u = manager_get_unit(m, e);
1256                 free(e);
1257
1258                 if (u &&
1259                     (MOUNT(u)->from_etc_fstab || MOUNT(u)->from_fragment) &&
1260                     MOUNT(u)->state != MOUNT_MOUNTED) {
1261                         r = 0;
1262                         goto finish;
1263                 }
1264
1265                 assert_se(slash = strrchr(t, '/'));
1266
1267                 if (slash == t) {
1268                         r = 1;
1269                         goto finish;
1270                 }
1271
1272                 *slash = 0;
1273         }
1274
1275         r = 1;
1276
1277 finish:
1278         free(t);
1279         return r;
1280 }
1281
1282 const UnitVTable mount_vtable = {
1283         .suffix = ".mount",
1284
1285         .no_alias = true,
1286         .no_instances = true,
1287
1288         .init = mount_init,
1289         .load = mount_load,
1290         .done = mount_done,
1291
1292         .coldplug = mount_coldplug,
1293
1294         .dump = mount_dump,
1295
1296         .start = mount_start,
1297         .stop = mount_stop,
1298         .reload = mount_reload,
1299
1300         .active_state = mount_active_state,
1301         .sub_state_to_string = mount_sub_state_to_string,
1302
1303         .sigchld_event = mount_sigchld_event,
1304         .timer_event = mount_timer_event,
1305
1306         .enumerate = mount_enumerate,
1307         .shutdown = mount_shutdown
1308 };