chiark / gitweb /
cc94ca6f2365cb078275ee9ad323efefbe345c83
[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 char *mount_name_from_where(const char *where) {
70         assert(where);
71
72         if (streq(where, "/"))
73                 return strdup("-.mount");
74
75         return unit_name_build_escape(where+1, NULL, ".mount");
76 }
77
78 static void service_unwatch_control_pid(Mount *m) {
79         assert(m);
80
81         if (m->control_pid <= 0)
82                 return;
83
84         unit_unwatch_pid(UNIT(m), m->control_pid);
85         m->control_pid = 0;
86 }
87
88 static void mount_parameters_done(MountParameters *p) {
89         assert(p);
90
91         free(p->what);
92         free(p->options);
93         free(p->fstype);
94
95         p->what = p->options = p->fstype = NULL;
96 }
97
98 static void mount_done(Unit *u) {
99         Mount *m = MOUNT(u);
100
101         assert(m);
102
103         free(m->where);
104         m->where = NULL;
105
106         mount_parameters_done(&m->parameters_etc_fstab);
107         mount_parameters_done(&m->parameters_proc_self_mountinfo);
108         mount_parameters_done(&m->parameters_fragment);
109
110         exec_context_done(&m->exec_context);
111         exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
112         m->control_command = NULL;
113
114         service_unwatch_control_pid(m);
115
116         unit_unwatch_timer(u, &m->timer_watch);
117 }
118
119 static void mount_init(Unit *u) {
120         Mount *m = MOUNT(u);
121
122         assert(u);
123         assert(u->meta.load_state == UNIT_STUB);
124
125         m->timeout_usec = DEFAULT_TIMEOUT_USEC;
126         exec_context_init(&m->exec_context);
127
128         /* We need to make sure that /bin/mount is always called in
129          * the same process group as us, so that the autofs kernel
130          * side doesn't send us another mount request while we are
131          * already trying to comply its last one. */
132         m->exec_context.no_setsid = true;
133
134         m->timer_watch.type = WATCH_INVALID;
135 }
136
137 static int mount_notify_automount(Mount *m, int status) {
138         Unit *p;
139         char *k;
140
141         assert(m);
142
143         if (!(k = unit_name_change_suffix(UNIT(m)->meta.id, ".automount")))
144                 return -ENOMEM;
145
146         p = manager_get_unit(UNIT(m)->meta.manager, k);
147         free(k);
148
149         if (!p)
150                 return 0;
151
152         return automount_send_ready(AUTOMOUNT(p), status);
153 }
154
155 static int mount_add_node_links(Mount *m) {
156         Unit *device;
157         char *e;
158         int r;
159         const char *what;
160
161         assert(m);
162
163         /* Adds in links to the device that this node is based on */
164
165         if (m->parameters_fragment.what)
166                 what = m->parameters_fragment.what;
167         else if (m->parameters_etc_fstab.what)
168                 what = m->parameters_etc_fstab.what;
169         else
170                 /* We observe kernel mounts only while they are live,
171                  * hence don't create any links for them */
172                 return 0;
173
174         if (!path_startswith(what, "/dev/"))
175                 return 0;
176
177         if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
178                 return -ENOMEM;
179
180         r = manager_load_unit(UNIT(m)->meta.manager, e, NULL, &device);
181         free(e);
182
183         if (r < 0)
184                 return r;
185
186         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, device)) < 0)
187                 return r;
188
189         if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, device)) < 0)
190                 return r;
191
192         if (UNIT(m)->meta.manager->running_as == MANAGER_INIT ||
193             UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM)
194                 if ((r = unit_add_dependency(device, UNIT_WANTS, UNIT(m))) < 0)
195                         return r;
196
197         return 0;
198 }
199
200 static int mount_add_path_links(Mount *m) {
201         Meta *other;
202         int r;
203
204         assert(m);
205
206         /* Adds in link to other mount points, that might lie below or
207          * above us in the hierarchy */
208
209         LIST_FOREACH(units_per_type, other, UNIT(m)->meta.manager->units_per_type[UNIT_MOUNT]) {
210                 Mount *n;
211
212                 n = (Mount*) other;
213
214                 if (n == m)
215                         continue;
216
217                 if (m->meta.load_state != UNIT_LOADED)
218                         continue;
219
220                 if (path_startswith(m->where, n->where)) {
221
222                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(other))) < 0)
223                                 return r;
224
225                         if (n->from_etc_fstab || n->from_fragment)
226                                 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(other))) < 0)
227                                         return r;
228
229                 } else if (path_startswith(n->where, m->where)) {
230
231                         if ((r = unit_add_dependency(UNIT(m), UNIT_BEFORE, UNIT(other))) < 0)
232                                 return r;
233
234                         if (m->from_etc_fstab || m->from_fragment)
235                                 if ((r = unit_add_dependency(UNIT(other), UNIT_REQUIRES, UNIT(m))) < 0)
236                                         return r;
237                 }
238         }
239
240         return 0;
241 }
242
243 static bool mount_test_option(const char *haystack, const char *needle) {
244         struct mntent me;
245
246         assert(needle);
247
248         /* Like glibc's hasmntopt(), but works on a string, not a
249          * struct mntent */
250
251         if (!haystack)
252                 return false;
253
254         zero(me);
255         me.mnt_opts = (char*) haystack;
256
257         return !!hasmntopt(&me, needle);
258 }
259
260 static int mount_add_target_links(Mount *m) {
261         const char *target;
262         MountParameters *p;
263         Unit *u;
264         int r;
265         bool noauto;
266         bool handle;
267
268         assert(m);
269
270         if (m->from_fragment)
271                 p = &m->parameters_fragment;
272         else if (m->from_etc_fstab)
273                 p = &m->parameters_etc_fstab;
274         else
275                 return 0;
276
277         noauto = mount_test_option(p->options, MNTOPT_NOAUTO);
278         handle = mount_test_option(p->options, "comment=systemd.mount");
279
280         if (noauto && !handle)
281                 return 0;
282
283         if (mount_test_option(p->options, "_netdev") ||
284             fstype_is_network(p->fstype))
285                 target = SPECIAL_REMOTE_FS_TARGET;
286         else
287                 target = SPECIAL_LOCAL_FS_TARGET;
288
289         if ((r = manager_load_unit(UNIT(m)->meta.manager, target, NULL, &u)) < 0)
290                 return r;
291
292         if (handle)
293                 if ((r = unit_add_dependency(u, UNIT_WANTS, UNIT(m))) < 0)
294                         return r;
295
296         return unit_add_dependency(UNIT(m), UNIT_BEFORE, u);
297 }
298
299 static int mount_verify(Mount *m) {
300         bool b;
301         char *e;
302         assert(m);
303
304         if (UNIT(m)->meta.load_state != UNIT_LOADED)
305                 return 0;
306
307         if (!m->where) {
308                 log_error("%s lacks Where setting. Refusing.", UNIT(m)->meta.id);
309                 return -EINVAL;
310         }
311
312         path_kill_slashes(m->where);
313
314         if (!(e = mount_name_from_where(m->where)))
315                 return -ENOMEM;
316
317         b = unit_has_name(UNIT(m), e);
318         free(e);
319
320         if (!b) {
321                 log_error("%s's Where setting doesn't match unit name. Refusing.", UNIT(m)->meta.id);
322                 return -EINVAL;
323         }
324
325         return 0;
326 }
327
328 static int mount_load(Unit *u) {
329         Mount *m = MOUNT(u);
330         int r;
331
332         assert(u);
333         assert(u->meta.load_state == UNIT_STUB);
334
335         if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
336                 return r;
337
338         /* This is a new unit? Then let's add in some extras */
339         if (u->meta.load_state == UNIT_LOADED) {
340
341                 /* Minor validity checking */
342                 if ((m->parameters_fragment.options || m->parameters_fragment.fstype) && !m->parameters_fragment.what)
343                         return -EBADMSG;
344
345                 if (m->parameters_fragment.what)
346                         m->from_fragment = true;
347
348                 if ((r = mount_add_node_links(MOUNT(u))) < 0)
349                         return r;
350
351                 if ((r = mount_add_path_links(MOUNT(u))) < 0)
352                         return r;
353
354                 if ((r = mount_add_target_links(MOUNT(u))) < 0)
355                         return r;
356
357                 if ((r = unit_add_default_cgroup(u)) < 0)
358                         return r;
359         }
360
361         return mount_verify(m);
362 }
363
364 static void mount_set_state(Mount *m, MountState state) {
365         MountState old_state;
366         assert(m);
367
368         old_state = m->state;
369         m->state = state;
370
371         if (state != MOUNT_MOUNTING &&
372             state != MOUNT_MOUNTING_DONE &&
373             state != MOUNT_REMOUNTING &&
374             state != MOUNT_UNMOUNTING &&
375             state != MOUNT_MOUNTING_SIGTERM &&
376             state != MOUNT_MOUNTING_SIGKILL &&
377             state != MOUNT_UNMOUNTING_SIGTERM &&
378             state != MOUNT_UNMOUNTING_SIGKILL &&
379             state != MOUNT_REMOUNTING_SIGTERM &&
380             state != MOUNT_REMOUNTING_SIGKILL) {
381                 unit_unwatch_timer(UNIT(m), &m->timer_watch);
382                 service_unwatch_control_pid(m);
383                 m->control_command = NULL;
384         }
385
386         if (state == MOUNT_MOUNTED ||
387             state == MOUNT_REMOUNTING)
388                 mount_notify_automount(m, 0);
389         else if (state == MOUNT_DEAD ||
390                  state == MOUNT_UNMOUNTING ||
391                  state == MOUNT_MOUNTING_SIGTERM ||
392                  state == MOUNT_MOUNTING_SIGKILL ||
393                  state == MOUNT_REMOUNTING_SIGTERM ||
394                  state == MOUNT_REMOUNTING_SIGKILL ||
395                  state == MOUNT_UNMOUNTING_SIGTERM ||
396                  state == MOUNT_UNMOUNTING_SIGKILL ||
397                  state == MOUNT_MAINTAINANCE)
398                 mount_notify_automount(m, -ENODEV);
399
400         if (state != old_state)
401                 log_debug("%s changed %s → %s", UNIT(m)->meta.id, state_string_table[old_state], state_string_table[state]);
402
403         unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state]);
404 }
405
406 static int mount_coldplug(Unit *u) {
407         Mount *m = MOUNT(u);
408
409         assert(m);
410         assert(m->state == MOUNT_DEAD);
411
412         if (m->from_proc_self_mountinfo)
413                 mount_set_state(m, MOUNT_MOUNTED);
414
415         return 0;
416 }
417
418 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
419         pid_t pid;
420         int r;
421
422         assert(m);
423         assert(c);
424         assert(_pid);
425
426         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
427                 goto fail;
428
429         if ((r = exec_spawn(c,
430                             NULL,
431                             &m->exec_context,
432                             NULL, 0,
433                             true,
434                             true,
435                             UNIT(m)->meta.manager->confirm_spawn,
436                             UNIT(m)->meta.cgroup_bondings,
437                             &pid)) < 0)
438                 goto fail;
439
440         if ((r = unit_watch_pid(UNIT(m), pid)) < 0)
441                 /* FIXME: we need to do something here */
442                 goto fail;
443
444         *_pid = pid;
445
446         return 0;
447
448 fail:
449         unit_unwatch_timer(UNIT(m), &m->timer_watch);
450
451         return r;
452 }
453
454 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
455         Mount *m = MOUNT(u);
456         MountParameters *p;
457
458         assert(m);
459         assert(f);
460
461         if (m->from_proc_self_mountinfo)
462                 p = &m->parameters_proc_self_mountinfo;
463         else if (m->from_fragment)
464                 p = &m->parameters_fragment;
465         else
466                 p = &m->parameters_etc_fstab;
467
468         fprintf(f,
469                 "%sMount State: %s\n"
470                 "%sWhere: %s\n"
471                 "%sWhat: %s\n"
472                 "%sFile System Type: %s\n"
473                 "%sOptions: %s\n"
474                 "%sFrom /etc/fstab: %s\n"
475                 "%sFrom /proc/self/mountinfo: %s\n"
476                 "%sFrom fragment: %s\n"
477                 "%sKillMode: %s\n",
478                 prefix, state_string_table[m->state],
479                 prefix, m->where,
480                 prefix, strna(p->what),
481                 prefix, strna(p->fstype),
482                 prefix, strna(p->options),
483                 prefix, yes_no(m->from_etc_fstab),
484                 prefix, yes_no(m->from_proc_self_mountinfo),
485                 prefix, yes_no(m->from_fragment),
486                 prefix, kill_mode_to_string(m->kill_mode));
487
488         if (m->control_pid > 0)
489                 fprintf(f,
490                         "%sControl PID: %llu\n",
491                         prefix, (unsigned long long) m->control_pid);
492
493         exec_context_dump(&m->exec_context, f, prefix);
494 }
495
496 static void mount_enter_dead(Mount *m, bool success) {
497         assert(m);
498
499         if (!success)
500                 m->failure = true;
501
502         mount_set_state(m, m->failure ? MOUNT_MAINTAINANCE : MOUNT_DEAD);
503 }
504
505 static void mount_enter_mounted(Mount *m, bool success) {
506         assert(m);
507
508         if (!success)
509                 m->failure = true;
510
511         mount_set_state(m, MOUNT_MOUNTED);
512 }
513
514 static void mount_enter_signal(Mount *m, MountState state, bool success) {
515         int r;
516         bool sent = false;
517
518         assert(m);
519
520         if (!success)
521                 m->failure = true;
522
523         if (m->kill_mode != KILL_NONE) {
524                 int sig = (state == MOUNT_MOUNTING_SIGTERM ||
525                            state == MOUNT_UNMOUNTING_SIGTERM ||
526                            state == MOUNT_REMOUNTING_SIGTERM) ? SIGTERM : SIGKILL;
527
528                 if (m->kill_mode == KILL_CONTROL_GROUP) {
529
530                         if ((r = cgroup_bonding_kill_list(UNIT(m)->meta.cgroup_bondings, sig)) < 0) {
531                                 if (r != -EAGAIN && r != -ESRCH)
532                                         goto fail;
533                         } else
534                                 sent = true;
535                 }
536
537                 if (!sent && m->control_pid > 0)
538                         if (kill(m->kill_mode == KILL_PROCESS ? m->control_pid : -m->control_pid, sig) < 0 && errno != ESRCH) {
539                                 r = -errno;
540                                 goto fail;
541                         }
542         }
543
544         if (sent) {
545                 if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
546                         goto fail;
547
548                 mount_set_state(m, state);
549         } else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
550                 mount_enter_mounted(m, true);
551         else
552                 mount_enter_dead(m, true);
553
554         return;
555
556 fail:
557         log_warning("%s failed to kill processes: %s", UNIT(m)->meta.id, strerror(-r));
558
559         if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
560                 mount_enter_mounted(m, false);
561         else
562                 mount_enter_dead(m, false);
563 }
564
565 static void mount_enter_unmounting(Mount *m, bool success) {
566         ExecCommand *c;
567         int r;
568
569         assert(m);
570
571         if (!success)
572                 m->failure = true;
573
574         m->control_command = c = m->exec_command + MOUNT_EXEC_UNMOUNT;
575
576         if ((r = exec_command_set(
577                              c,
578                              "/bin/umount",
579                              m->where,
580                              NULL)) < 0)
581                 goto fail;
582
583         service_unwatch_control_pid(m);
584
585         if ((r = mount_spawn(m, c, &m->control_pid)) < 0)
586                 goto fail;
587
588         mount_set_state(m, MOUNT_UNMOUNTING);
589
590         return;
591
592 fail:
593         log_warning("%s failed to run umount exectuable: %s", UNIT(m)->meta.id, strerror(-r));
594         mount_enter_mounted(m, false);
595 }
596
597 static void mount_enter_mounting(Mount *m) {
598         ExecCommand *c;
599         int r;
600
601         assert(m);
602
603         m->control_command = c = m->exec_command + MOUNT_EXEC_MOUNT;
604
605         if (m->from_fragment)
606                 r = exec_command_set(
607                                 c,
608                                 "/bin/mount",
609                                 m->parameters_fragment.what,
610                                 m->where,
611                                 "-t", m->parameters_fragment.fstype,
612                                 m->parameters_fragment.options ? "-o" : NULL, m->parameters_fragment.options,
613                                 NULL);
614         else if (m->from_etc_fstab)
615                 r = exec_command_set(
616                                 c,
617                                 "/bin/mount",
618                                 m->where,
619                                 NULL);
620         else
621                 r = -ENOENT;
622
623         if (r < 0)
624                 goto fail;
625
626         service_unwatch_control_pid(m);
627
628         if ((r = mount_spawn(m, c, &m->control_pid)) < 0)
629                 goto fail;
630
631         mount_set_state(m, MOUNT_MOUNTING);
632
633         return;
634
635 fail:
636         log_warning("%s failed to run mount exectuable: %s", UNIT(m)->meta.id, strerror(-r));
637         mount_enter_dead(m, false);
638 }
639
640 static void mount_enter_mounting_done(Mount *m) {
641         assert(m);
642
643         mount_set_state(m, MOUNT_MOUNTING_DONE);
644 }
645
646 static void mount_enter_remounting(Mount *m, bool success) {
647         ExecCommand *c;
648         int r;
649
650         assert(m);
651
652         if (!success)
653                 m->failure = true;
654
655         m->control_command = c = m->exec_command + MOUNT_EXEC_REMOUNT;
656
657         if (m->from_fragment) {
658                 char *buf = NULL;
659                 const char *o;
660
661                 if (m->parameters_fragment.options) {
662                         if (!(buf = strappend("remount,", m->parameters_fragment.options))) {
663                                 r = -ENOMEM;
664                                 goto fail;
665                         }
666
667                         o = buf;
668                 } else
669                         o = "remount";
670
671                 r = exec_command_set(
672                                 c,
673                                 "/bin/mount",
674                                 m->parameters_fragment.what,
675                                 m->where,
676                                 "-t", m->parameters_fragment.fstype,
677                                 "-o", o,
678                                 NULL);
679
680                 free(buf);
681         } else if (m->from_etc_fstab)
682                 r = exec_command_set(
683                                 c,
684                                 "/bin/mount",
685                                 m->where,
686                                 "-o", "remount",
687                                 NULL);
688         else
689                 r = -ENOENT;
690
691         if (r < 0) {
692                 r = -ENOMEM;
693                 goto fail;
694         }
695
696         service_unwatch_control_pid(m);
697
698         if ((r = mount_spawn(m, c, &m->control_pid)) < 0)
699                 goto fail;
700
701         mount_set_state(m, MOUNT_REMOUNTING);
702
703         return;
704
705 fail:
706         mount_enter_mounted(m, false);
707 }
708
709 static int mount_start(Unit *u) {
710         Mount *m = MOUNT(u);
711
712         assert(m);
713
714         /* We cannot fulfill this request right now, try again later
715          * please! */
716         if (m->state == MOUNT_UNMOUNTING ||
717             m->state == MOUNT_UNMOUNTING_SIGTERM ||
718             m->state == MOUNT_UNMOUNTING_SIGKILL)
719                 return -EAGAIN;
720
721         /* Already on it! */
722         if (m->state == MOUNT_MOUNTING ||
723             m->state == MOUNT_MOUNTING_SIGTERM ||
724             m->state == MOUNT_MOUNTING_SIGKILL)
725                 return 0;
726
727         assert(m->state == MOUNT_DEAD || m->state == MOUNT_MAINTAINANCE);
728
729         m->failure = false;
730
731         mount_enter_mounting(m);
732         return 0;
733 }
734
735 static int mount_stop(Unit *u) {
736         Mount *m = MOUNT(u);
737
738         assert(m);
739
740         /* Cann't do this right now. */
741         if (m->state == MOUNT_MOUNTING ||
742             m->state == MOUNT_MOUNTING_DONE ||
743             m->state == MOUNT_MOUNTING_SIGTERM ||
744             m->state == MOUNT_MOUNTING_SIGKILL ||
745             m->state == MOUNT_REMOUNTING ||
746             m->state == MOUNT_REMOUNTING_SIGTERM ||
747             m->state == MOUNT_REMOUNTING_SIGKILL)
748                 return -EAGAIN;
749
750         /* Already on it */
751         if (m->state == MOUNT_UNMOUNTING ||
752             m->state == MOUNT_UNMOUNTING_SIGKILL ||
753             m->state == MOUNT_UNMOUNTING_SIGTERM)
754                 return 0;
755
756         assert(m->state == MOUNT_MOUNTED);
757
758         mount_enter_unmounting(m, true);
759         return 0;
760 }
761
762 static int mount_reload(Unit *u) {
763         Mount *m = MOUNT(u);
764
765         assert(m);
766
767         if (m->state == MOUNT_MOUNTING_DONE)
768                 return -EAGAIN;
769
770         assert(m->state == MOUNT_MOUNTED);
771
772         mount_enter_remounting(m, true);
773         return 0;
774 }
775
776 static UnitActiveState mount_active_state(Unit *u) {
777         assert(u);
778
779         return state_translation_table[MOUNT(u)->state];
780 }
781
782 static const char *mount_sub_state_to_string(Unit *u) {
783         assert(u);
784
785         return state_string_table[MOUNT(u)->state];
786 }
787
788 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
789         Mount *m = MOUNT(u);
790         bool success;
791
792         assert(m);
793         assert(pid >= 0);
794
795         success = code == CLD_EXITED && status == 0;
796         m->failure = m->failure || !success;
797
798         assert(m->control_pid == pid);
799         assert(m->control_command);
800
801         exec_status_fill(&m->control_command->exec_status, pid, code, status);
802         m->control_pid = 0;
803
804         log_debug("%s control process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
805
806         /* Note that mount(8) returning and the kernel sending us a
807          * mount table change event might happen out-of-order. If an
808          * operation succeed we assume the kernel will follow soon too
809          * and already change into the resulting state.  If it fails
810          * we check if the kernel still knows about the mount. and
811          * change state accordingly. */
812
813         switch (m->state) {
814
815         case MOUNT_MOUNTING:
816         case MOUNT_MOUNTING_DONE:
817         case MOUNT_MOUNTING_SIGKILL:
818         case MOUNT_MOUNTING_SIGTERM:
819         case MOUNT_REMOUNTING:
820         case MOUNT_REMOUNTING_SIGKILL:
821         case MOUNT_REMOUNTING_SIGTERM:
822
823                 if (success && m->from_proc_self_mountinfo)
824                         mount_enter_mounted(m, true);
825                 else if (m->from_proc_self_mountinfo)
826                         mount_enter_mounted(m, false);
827                 else
828                         mount_enter_dead(m, false);
829                 break;
830
831         case MOUNT_UNMOUNTING:
832         case MOUNT_UNMOUNTING_SIGKILL:
833         case MOUNT_UNMOUNTING_SIGTERM:
834
835                 if (success)
836                         mount_enter_dead(m, true);
837                 else if (m->from_proc_self_mountinfo)
838                         mount_enter_mounted(m, false);
839                 else
840                         mount_enter_dead(m, false);
841                 break;
842
843         default:
844                 assert_not_reached("Uh, control process died at wrong time.");
845         }
846 }
847
848 static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
849         Mount *m = MOUNT(u);
850
851         assert(m);
852         assert(elapsed == 1);
853         assert(w == &m->timer_watch);
854
855         switch (m->state) {
856
857         case MOUNT_MOUNTING:
858         case MOUNT_MOUNTING_DONE:
859                 log_warning("%s mounting timed out. Stopping.", u->meta.id);
860                 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false);
861                 break;
862
863         case MOUNT_REMOUNTING:
864                 log_warning("%s remounting timed out. Stopping.", u->meta.id);
865                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, false);
866                 break;
867
868         case MOUNT_UNMOUNTING:
869                 log_warning("%s unmounting timed out. Stopping.", u->meta.id);
870                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false);
871                 break;
872
873         case MOUNT_MOUNTING_SIGTERM:
874                 log_warning("%s mounting timed out. Killing.", u->meta.id);
875                 mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false);
876                 break;
877
878         case MOUNT_REMOUNTING_SIGTERM:
879                 log_warning("%s remounting timed out. Killing.", u->meta.id);
880                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false);
881                 break;
882
883         case MOUNT_UNMOUNTING_SIGTERM:
884                 log_warning("%s unmounting timed out. Killing.", u->meta.id);
885                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false);
886                 break;
887
888         case MOUNT_MOUNTING_SIGKILL:
889         case MOUNT_REMOUNTING_SIGKILL:
890         case MOUNT_UNMOUNTING_SIGKILL:
891                 log_warning("%s mount process still around after SIGKILL. Ignoring.", u->meta.id);
892
893                 if (m->from_proc_self_mountinfo)
894                         mount_enter_mounted(m, false);
895                 else
896                         mount_enter_dead(m, false);
897                 break;
898
899         default:
900                 assert_not_reached("Timeout at wrong time.");
901         }
902 }
903
904 static int mount_add_one(
905                 Manager *m,
906                 const char *what,
907                 const char *where,
908                 const char *options,
909                 const char *fstype,
910                 bool from_proc_self_mountinfo,
911                 bool set_flags) {
912         int r;
913         Unit *u;
914         bool delete;
915         char *e, *w = NULL, *o = NULL, *f = NULL;
916         MountParameters *mp;
917
918         assert(m);
919         assert(what);
920         assert(where);
921         assert(options);
922         assert(fstype);
923
924         assert(!set_flags || from_proc_self_mountinfo);
925
926         /* Ignore API mount points. They should never be referenced in
927          * dependencies ever. */
928         if (mount_point_is_api(where))
929                 return 0;
930
931         if (streq(fstype, "autofs"))
932                 return 0;
933
934         /* probably some kind of swap, which we don't cover for now */
935         if (where[0] != '/')
936                 return 0;
937
938         e = mount_name_from_where(where);
939
940         if (!e)
941                 return -ENOMEM;
942
943         if (!(u = manager_get_unit(m, e))) {
944                 delete = true;
945
946                 if (!(u = unit_new(m))) {
947                         free(e);
948                         return -ENOMEM;
949                 }
950
951                 r = unit_add_name(u, e);
952                 free(e);
953
954                 if (r < 0)
955                         goto fail;
956
957                 if (!(MOUNT(u)->where = strdup(where))) {
958                             r = -ENOMEM;
959                             goto fail;
960                     }
961
962                 if ((r = unit_set_description(u, where)) < 0)
963                         goto fail;
964
965                 unit_add_to_load_queue(u);
966         } else {
967                 delete = false;
968                 free(e);
969         }
970
971         if (!(w = strdup(what)) ||
972             !(o = strdup(options)) ||
973             !(f = strdup(fstype))) {
974                 r = -ENOMEM;
975                 goto fail;
976         }
977
978         if (from_proc_self_mountinfo) {
979                 mp = &MOUNT(u)->parameters_proc_self_mountinfo;
980
981                 if (set_flags) {
982                         MOUNT(u)->is_mounted = true;
983                         MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
984                         MOUNT(u)->just_changed = !streq_ptr(MOUNT(u)->parameters_proc_self_mountinfo.options, o);
985                 }
986
987                 MOUNT(u)->from_proc_self_mountinfo = true;
988
989         } else {
990                 mp = &MOUNT(u)->parameters_etc_fstab;
991
992                 MOUNT(u)->from_etc_fstab = true;
993         }
994
995         free(mp->what);
996         mp->what = w;
997
998         free(mp->options);
999         mp->options = o;
1000
1001         free(mp->fstype);
1002         mp->fstype = f;
1003
1004         unit_add_to_dbus_queue(u);
1005
1006         return 0;
1007
1008 fail:
1009         free(w);
1010         free(o);
1011         free(f);
1012
1013         if (delete && u)
1014                 unit_free(u);
1015
1016         return 0;
1017 }
1018
1019 static char *fstab_node_to_udev_node(char *p) {
1020         char *dn, *t;
1021         int r;
1022
1023         /* FIXME: to follow udev's logic 100% we need to leave valid
1024          * UTF8 chars unescaped */
1025
1026         if (startswith(p, "LABEL=")) {
1027
1028                 if (!(t = xescape(p+6, "/ ")))
1029                         return NULL;
1030
1031                 r = asprintf(&dn, "/dev/disk/by-label/%s", t);
1032                 free(t);
1033
1034                 if (r < 0)
1035                         return NULL;
1036
1037                 return dn;
1038         }
1039
1040         if (startswith(p, "UUID=")) {
1041
1042                 if (!(t = xescape(p+5, "/ ")))
1043                         return NULL;
1044
1045                 r = asprintf(&dn, "/dev/disk/by-uuid/%s", ascii_strlower(t));
1046                 free(t);
1047
1048                 if (r < 0)
1049                         return NULL;
1050
1051                 return dn;
1052         }
1053
1054         return strdup(p);
1055 }
1056
1057 static int mount_load_etc_fstab(Manager *m) {
1058         FILE *f;
1059         int r;
1060         struct mntent* me;
1061
1062         assert(m);
1063
1064         errno = 0;
1065         if (!(f = setmntent("/etc/fstab", "r")))
1066                 return -errno;
1067
1068         while ((me = getmntent(f))) {
1069                 char *where, *what;
1070
1071                 if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
1072                         r = -ENOMEM;
1073                         goto finish;
1074                 }
1075
1076                 if (!(where = strdup(me->mnt_dir))) {
1077                         free(what);
1078                         r = -ENOMEM;
1079                         goto finish;
1080                 }
1081
1082                 if (what[0] == '/')
1083                         path_kill_slashes(what);
1084
1085                 if (where[0] == '/')
1086                         path_kill_slashes(where);
1087
1088                 r = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, false, false);
1089                 free(what);
1090                 free(where);
1091
1092                 if (r < 0)
1093                         goto finish;
1094         }
1095
1096         r = 0;
1097 finish:
1098
1099         endmntent(f);
1100         return r;
1101 }
1102
1103 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1104         int r;
1105         char *device, *path, *options, *fstype, *d, *p;
1106
1107         assert(m);
1108
1109         rewind(m->proc_self_mountinfo);
1110
1111         for (;;) {
1112                 int k;
1113
1114                 device = path = options = fstype = d = p = NULL;
1115
1116                 if ((k = fscanf(m->proc_self_mountinfo,
1117                                 "%*s "       /* (1) mount id */
1118                                 "%*s "       /* (2) parent id */
1119                                 "%*s "       /* (3) major:minor */
1120                                 "%*s "       /* (4) root */
1121                                 "%ms "       /* (5) mount point */
1122                                 "%ms"        /* (6) mount options */
1123                                 "%*[^-]"     /* (7) optional fields */
1124                                 "- "         /* (8) seperator */
1125                                 "%ms "       /* (9) file system type */
1126                                 "%ms"        /* (10) mount source */
1127                                 "%*[^\n]",   /* some rubbish at the end */
1128                                 &path,
1129                                 &options,
1130                                 &fstype,
1131                                 &device)) != 4) {
1132
1133                         if (k == EOF)
1134                                 break;
1135
1136                         r = -EBADMSG;
1137                         goto finish;
1138                 }
1139
1140                 if (!(d = cunescape(device)) ||
1141                     !(p = cunescape(path))) {
1142                         r = -ENOMEM;
1143                         goto finish;
1144                 }
1145
1146                 if ((r = mount_add_one(m, d, p, options, fstype, true, set_flags)) < 0)
1147                         goto finish;
1148
1149                 free(device);
1150                 free(path);
1151                 free(options);
1152                 free(fstype);
1153                 free(d);
1154                 free(p);
1155         }
1156
1157         r = 0;
1158
1159 finish:
1160         free(device);
1161         free(path);
1162         free(options);
1163         free(fstype);
1164         free(d);
1165         free(p);
1166
1167         return r;
1168 }
1169
1170 static void mount_shutdown(Manager *m) {
1171         assert(m);
1172
1173         if (m->proc_self_mountinfo)
1174                 fclose(m->proc_self_mountinfo);
1175 }
1176
1177 static int mount_enumerate(Manager *m) {
1178         int r;
1179         struct epoll_event ev;
1180         assert(m);
1181
1182         if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "r")))
1183                 return -errno;
1184
1185         m->mount_watch.type = WATCH_MOUNT;
1186         m->mount_watch.fd = fileno(m->proc_self_mountinfo);
1187
1188         zero(ev);
1189         ev.events = EPOLLERR;
1190         ev.data.ptr = &m->mount_watch;
1191
1192         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
1193                 return -errno;
1194
1195         if ((r = mount_load_etc_fstab(m)) < 0)
1196                 goto fail;
1197
1198         if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
1199                 goto fail;
1200
1201         return 0;
1202
1203 fail:
1204         mount_shutdown(m);
1205         return r;
1206 }
1207
1208 void mount_fd_event(Manager *m, int events) {
1209         Meta *meta;
1210         int r;
1211
1212         assert(m);
1213         assert(events == EPOLLERR);
1214
1215         /* The manager calls this for every fd event happening on the
1216          * /proc/self/mountinfo file, which informs us about mounting
1217          * table changes */
1218
1219         if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
1220                 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-errno));
1221
1222                 /* Reset flags, just in case, for later calls */
1223                 LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1224                         Mount *mount = (Mount*) meta;
1225
1226                         mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1227                 }
1228
1229                 return;
1230         }
1231
1232         manager_dispatch_load_queue(m);
1233
1234         LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1235                 Mount *mount = (Mount*) meta;
1236
1237                 if (!mount->is_mounted) {
1238                         /* This has just been unmounted. */
1239
1240                         mount->from_proc_self_mountinfo = false;
1241
1242                         switch (mount->state) {
1243
1244                         case MOUNT_MOUNTED:
1245                                 mount_enter_dead(mount, true);
1246                                 break;
1247
1248                         default:
1249                                 mount_set_state(mount, mount->state);
1250                                 break;
1251
1252                         }
1253
1254                 } else if (mount->just_mounted || mount->just_changed) {
1255
1256                         /* New or changed entrymount */
1257
1258                         switch (mount->state) {
1259
1260                         case MOUNT_DEAD:
1261                         case MOUNT_MAINTAINANCE:
1262                                 mount_enter_mounted(mount, true);
1263                                 break;
1264
1265                         case MOUNT_MOUNTING:
1266                                 mount_enter_mounting_done(mount);
1267                                 break;
1268
1269                         default:
1270                                 /* Nothing really changed, but let's
1271                                  * issue an notification call
1272                                  * nonetheless, in case somebody is
1273                                  * waiting for this. (e.g. file system
1274                                  * ro/rw remounts.) */
1275                                 mount_set_state(mount, mount->state);
1276                                 break;
1277                         }
1278                 }
1279
1280                 /* Reset the flags for later calls */
1281                 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1282         }
1283 }
1284
1285 int mount_path_is_mounted(Manager *m, const char* path) {
1286         char *t;
1287         int r;
1288
1289         assert(m);
1290         assert(path);
1291
1292         if (path[0] != '/')
1293                 return 1;
1294
1295         if (!(t = strdup(path)))
1296                 return -ENOMEM;
1297
1298         path_kill_slashes(t);
1299
1300         for (;;) {
1301                 char *e, *slash;
1302                 Unit *u;
1303
1304                 if (!(e = mount_name_from_where(t))) {
1305                         r = -ENOMEM;
1306                         goto finish;
1307                 }
1308
1309                 u = manager_get_unit(m, e);
1310                 free(e);
1311
1312                 if (u &&
1313                     (MOUNT(u)->from_etc_fstab || MOUNT(u)->from_fragment) &&
1314                     MOUNT(u)->state != MOUNT_MOUNTED) {
1315                         r = 0;
1316                         goto finish;
1317                 }
1318
1319                 assert_se(slash = strrchr(t, '/'));
1320
1321                 if (slash == t) {
1322                         r = 1;
1323                         goto finish;
1324                 }
1325
1326                 *slash = 0;
1327         }
1328
1329         r = 1;
1330
1331 finish:
1332         free(t);
1333         return r;
1334 }
1335
1336 const UnitVTable mount_vtable = {
1337         .suffix = ".mount",
1338
1339         .no_alias = true,
1340         .no_instances = true,
1341
1342         .init = mount_init,
1343         .load = mount_load,
1344         .done = mount_done,
1345
1346         .coldplug = mount_coldplug,
1347
1348         .dump = mount_dump,
1349
1350         .start = mount_start,
1351         .stop = mount_stop,
1352         .reload = mount_reload,
1353
1354         .active_state = mount_active_state,
1355         .sub_state_to_string = mount_sub_state_to_string,
1356
1357         .sigchld_event = mount_sigchld_event,
1358         .timer_event = mount_timer_event,
1359
1360         .enumerate = mount_enumerate,
1361         .shutdown = mount_shutdown
1362 };