chiark / gitweb /
rework tty handling
[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
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 };