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[people/ms/systemd.git] / mount.c
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5cb5a6ff
LP		 1/*-*- Mode: C; c-basic-offset: 8 -*-*/
2
a7334b09
LP		 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
5cb5a6ff 22#include <errno.h>
b08d03ff
LP		 23#include <stdio.h>
24#include <mntent.h>
ef734fd6 25#include <sys/epoll.h>
e537352b 26#include <signal.h>
5cb5a6ff 27
87f0e418 28#include "unit.h"
5cb5a6ff
LP		 29#include "mount.h"
30#include "load-fragment.h"
5cb5a6ff 31#include "load-dropin.h"
b08d03ff 32#include "log.h"
e537352b
LP		 33#include "strv.h"
34#include "mount-setup.h"
5cb5a6ff 35
f50e0a01
LP		 36static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
37 [MOUNT_DEAD] = UNIT_INACTIVE,
38 [MOUNT_MOUNTING] = UNIT_ACTIVATING,
e537352b 39 [MOUNT_MOUNTING_DONE] = UNIT_ACTIVE,
f50e0a01 40 [MOUNT_MOUNTED] = UNIT_ACTIVE,
e537352b 41 [MOUNT_REMOUNTING] = UNIT_ACTIVE_RELOADING,
f50e0a01 42 [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
e537352b
LP		 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,
f50e0a01
LP		 49 [MOUNT_MAINTAINANCE] = UNIT_INACTIVE,
50};
5cb5a6ff 51
f50e0a01
LP		 52static const char* const state_string_table[_MOUNT_STATE_MAX] = {
53 [MOUNT_DEAD] = "dead",
54 [MOUNT_MOUNTING] = "mounting",
e537352b 55 [MOUNT_MOUNTING_DONE] = "mounting-done",
f50e0a01 56 [MOUNT_MOUNTED] = "mounted",
e537352b 57 [MOUNT_REMOUNTING] = "remounting",
f50e0a01 58 [MOUNT_UNMOUNTING] = "unmounting",
e537352b
LP		 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",
f50e0a01
LP		 65 [MOUNT_MAINTAINANCE] = "maintainance"
66};
5cb5a6ff 67
e537352b
LP		 68static void mount_parameters_done(MountParameters *p) {
69 assert(p);
70
71 free(p->what);
72 free(p->options);
73 free(p->fstype);
74
75 p->what = p->options = p->fstype = NULL;
76}
77
87f0e418 78static void mount_done(Unit *u) {
ef734fd6 79 Mount *m = MOUNT(u);
034c6ed7 80
ef734fd6 81 assert(m);
034c6ed7 82
e537352b
LP		 83 free(m->where);
84 m->where = NULL;
f50e0a01 85
e537352b
LP		 86 mount_parameters_done(&m->parameters_etc_fstab);
87 mount_parameters_done(&m->parameters_proc_self_mountinfo);
88 mount_parameters_done(&m->parameters_fragment);
ef734fd6 89
e537352b
LP		 90 exec_context_done(&m->exec_context);
91 exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
92 m->control_command = NULL;
f50e0a01 93
e537352b
LP		 94 if (m->control_pid > 0) {
95 unit_unwatch_pid(u, m->control_pid);
96 m->control_pid = 0;
97 }
f50e0a01 98
e537352b 99 unit_unwatch_timer(u, &m->timer_watch);
f50e0a01
LP		 100}
101
e537352b 102static void mount_init(Unit *u) {
f50e0a01
LP		 103 Mount *m = MOUNT(u);
104
e537352b
LP		 105 assert(u);
106 assert(u->meta.load_state == UNIT_STUB);
5cb5a6ff 107
e537352b
LP		 108 m->state = 0;
109 m->from_etc_fstab = false;
110 m->from_proc_self_mountinfo = false;
111 m->from_fragment = false;
5cb5a6ff 112
e537352b
LP		 113 m->is_mounted = false;
114 m->just_mounted = false;
115 m->just_changed = false;
f50e0a01 116
e537352b 117 m->timeout_usec = DEFAULT_TIMEOUT_USEC;
5cb5a6ff 118
e537352b
LP		 119 zero(m->exec_command);
120 exec_context_init(&m->exec_context);
5cb5a6ff 121
e537352b 122 m->kill_mode = 0;
b08d03ff 123
e537352b
LP		 124 m->control_pid = 0;
125 m->failure = false;
ef734fd6 126
e537352b 127 m->timer_watch.type = WATCH_INVALID;
b08d03ff
LP		 128}
129
130static int mount_add_node_links(Mount *m) {
131 Unit *device;
132 char *e;
133 int r;
e537352b 134 const char *what;
b08d03ff
LP		 135
136 assert(m);
137
138 /* Adds in links to the device that this node is based on */
139
e537352b
LP		 140 if (m->parameters_fragment.what)
141 what = m->parameters_fragment.what;
142 else if (m->parameters_etc_fstab.what)
143 what = m->parameters_etc_fstab.what;
144 else
145 /* We observe kernel mounts only while they are live,
146 * hence don't create any links for them */
147 return 0;
148
149 if (!path_startswith(what, "/dev/"))
b08d03ff
LP		 150 return 0;
151
e537352b 152 if (!(e = unit_name_escape_path(what+1, ".device")))
b08d03ff
LP		 153 return -ENOMEM;
154
155 r = manager_load_unit(UNIT(m)->meta.manager, e, &device);
156 free(e);
157
158 if (r < 0)
159 return r;
160
161 if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, device)) < 0)
162 return r;
163
164 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, device)) < 0)
165 return r;
166
e537352b
LP		 167 if (UNIT(m)->meta.manager->running_as == MANAGER_INIT ||
168 UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM)
169 if ((r = unit_add_dependency(device, UNIT_WANTS, UNIT(m))) < 0)
170 return r;
b08d03ff
LP		 171
172 return 0;
173}
174
175static int mount_add_path_links(Mount *m) {
ef734fd6 176 Meta *other;
b08d03ff
LP		 177 int r;
178
e537352b
LP		 179 assert(m);
180
b08d03ff
LP		 181 /* Adds in link to other mount points, that might lie below or
182 * above us in the hierarchy */
183
ef734fd6 184 LIST_FOREACH(units_per_type, other, UNIT(m)->meta.manager->units_per_type[UNIT_MOUNT]) {
b08d03ff
LP		 185 Mount *n;
186
ef734fd6 187 n = (Mount*) other;
b08d03ff 188
ef734fd6 189 if (n == m)
79ef004b 190 continue;
b08d03ff 191
e537352b
LP		 192 if (m->meta.load_state != UNIT_LOADED)
193 continue;
194
b08d03ff
LP		 195 if (path_startswith(m->where, n->where)) {
196
e537352b 197 if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(other))) < 0)
b08d03ff
LP		 198 return r;
199
e537352b
LP		 200 if (n->from_etc_fstab || n->from_fragment)
201 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(other))) < 0)
202 return r;
b08d03ff 203
e537352b 204 } else if (path_startswith(n->where, m->where)) {
b08d03ff 205
e537352b 206 if ((r = unit_add_dependency(UNIT(m), UNIT_BEFORE, UNIT(other))) < 0)
b08d03ff
LP		 207 return r;
208
e537352b
LP		 209 if (m->from_etc_fstab || m->from_fragment)
210 if ((r = unit_add_dependency(UNIT(other), UNIT_REQUIRES, UNIT(m))) < 0)
211 return r;
b08d03ff
LP		 212 }
213 }
214
215 return 0;
216}
217
e537352b
LP		 218static bool mount_test_option(const char *haystack, const char *needle) {
219 struct mntent me;
220
221 assert(needle);
222
223 /* Like glibc's hasmntopt(), but works on a string, not a
224 * struct mntent */
225
226 if (!haystack)
227 return false;
228
229 zero(me);
230 me.mnt_opts = (char*) haystack;
231
232 return !!hasmntopt(&me, needle);
233}
234
235static int mount_add_target_links(Mount *m) {
236 const char *target;
237 MountParameters *p;
238 Unit *u;
239 int r;
240
241 assert(m);
242
243 if (m->from_fragment)
244 p = &m->parameters_fragment;
245 else if (m->from_etc_fstab)
246 p = &m->parameters_etc_fstab;
247 else
248 return 0;
249
250 if (!p->fstype)
251 return 0;
252
253 if (mount_test_option(p->options, MNTOPT_NOAUTO))
254 return 0;
255
256 if (mount_test_option(p->options, "_netdev") ||
257 fstype_is_network(p->fstype))
258 target = SPECIAL_REMOTE_FS_TARGET;
259 else
260 target = SPECIAL_LOCAL_FS_TARGET;
261
262 if ((r = manager_load_unit(UNIT(m)->meta.manager, target, &u)) < 0)
263 return r;
264
265 if ((r = unit_add_dependency(u, UNIT_WANTS, UNIT(m))) < 0)
266 return r;
267
268 return unit_add_dependency(UNIT(m), UNIT_BEFORE, u);
269}
270
271static int mount_load(Unit *u) {
272 Mount *m = MOUNT(u);
273 int r;
274
275 assert(u);
276 assert(u->meta.load_state == UNIT_STUB);
277
278 if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
279 return r;
280
281 /* This is a new unit? Then let's add in some extras */
282 if (u->meta.load_state == UNIT_LOADED) {
283
284 /* Minor validity checking */
285 if ((m->parameters_fragment.options || m->parameters_fragment.fstype) && !m->parameters_fragment.what)
286 return -EBADMSG;
287
288 if (m->parameters_fragment.what)
289 m->from_fragment = true;
290
291 if ((r = mount_add_node_links(MOUNT(u))) < 0)
292 return r;
293
294 if ((r = mount_add_path_links(MOUNT(u))) < 0)
295 return r;
296
297 if ((r = mount_add_target_links(MOUNT(u))) < 0)
298 return r;
299
300 if ((r = unit_add_default_cgroup(u)) < 0)
301 return r;
302 }
303
304 return 0;
305}
306
307static void mount_set_state(Mount *m, MountState state) {
308 MountState old_state;
309 assert(m);
310
311 old_state = m->state;
312 m->state = state;
313
314 if (state != MOUNT_MOUNTING &&
315 state != MOUNT_MOUNTING_DONE &&
316 state != MOUNT_REMOUNTING &&
317 state != MOUNT_UNMOUNTING &&
318 state != MOUNT_MOUNTING_SIGTERM &&
319 state != MOUNT_MOUNTING_SIGKILL &&
320 state != MOUNT_UNMOUNTING_SIGTERM &&
321 state != MOUNT_UNMOUNTING_SIGKILL &&
322 state != MOUNT_REMOUNTING_SIGTERM &&
323 state != MOUNT_REMOUNTING_SIGKILL) {
324 unit_unwatch_timer(UNIT(m), &m->timer_watch);
325
326 if (m->control_pid > 0) {
327 unit_unwatch_pid(UNIT(m), m->control_pid);
328 m->control_pid = 0;
329 }
330
331 m->control_command = NULL;
332 }
333
334 if (state != old_state)
335 log_debug("%s changed %s → %s", unit_id(UNIT(m)), state_string_table[old_state], state_string_table[state]);
336
337 unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state]);
338}
339
340static int mount_coldplug(Unit *u) {
341 Mount *m = MOUNT(u);
342
343 assert(m);
344 assert(m->state == MOUNT_DEAD);
345
346 if (m->from_proc_self_mountinfo)
347 mount_set_state(m, MOUNT_MOUNTED);
348
349 return 0;
350}
351
352static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
353 pid_t pid;
354 int r;
355
356 assert(m);
357 assert(c);
358 assert(_pid);
359
360 if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
361 goto fail;
362
363 if ((r = exec_spawn(c,
364 &m->exec_context,
365 NULL, 0,
366 true,
367 true,
368 UNIT(m)->meta.cgroup_bondings,
369 &pid)) < 0)
370 goto fail;
371
372 if ((r = unit_watch_pid(UNIT(m), pid)) < 0)
373 /* FIXME: we need to do something here */
374 goto fail;
375
376 *_pid = pid;
377
378 return 0;
379
380fail:
381 unit_unwatch_timer(UNIT(m), &m->timer_watch);
382
383 return r;
384}
385
386static void mount_dump(Unit *u, FILE *f, const char *prefix) {
387 Mount *m = MOUNT(u);
388 MountParameters *p;
389
390 assert(m);
391 assert(f);
392
393 if (m->from_proc_self_mountinfo)
394 p = &m->parameters_proc_self_mountinfo;
395 else if (m->from_fragment)
396 p = &m->parameters_fragment;
397 else
398 p = &m->parameters_etc_fstab;
399
400 fprintf(f,
401 "%sMount State: %s\n"
402 "%sWhere: %s\n"
403 "%sWhat: %s\n"
404 "%sFile System Type: %s\n"
405 "%sOptions: %s\n"
406 "%sFrom /etc/fstab: %s\n"
407 "%sFrom /proc/self/mountinfo: %s\n"
408 "%sFrom fragment: %s\n"
409 "%sKillMode: %s\n",
410 prefix, state_string_table[m->state],
411 prefix, m->where,
412 prefix, strna(p->what),
413 prefix, strna(p->fstype),
414 prefix, strna(p->options),
415 prefix, yes_no(m->from_etc_fstab),
416 prefix, yes_no(m->from_proc_self_mountinfo),
417 prefix, yes_no(m->from_fragment),
418 prefix, kill_mode_to_string(m->kill_mode));
419
420 if (m->control_pid > 0)
421 fprintf(f,
422 "%sControl PID: %llu\n",
423 prefix, (unsigned long long) m->control_pid);
424
425 exec_context_dump(&m->exec_context, f, prefix);
426}
427
428static void mount_enter_dead(Mount *m, bool success) {
429 assert(m);
430
431 if (!success)
432 m->failure = true;
433
434 mount_set_state(m, m->failure ? MOUNT_MAINTAINANCE : MOUNT_DEAD);
435}
436
437static void mount_enter_signal(Mount *m, MountState state, bool success) {
438 int r;
439
440 assert(m);
441
442 if (!success)
443 m->failure = true;
444
445 if (m->control_pid > 0) {
446 int sig;
447 bool sent = false;
448
449 sig = (state == MOUNT_MOUNTING_SIGTERM ||
450 state == MOUNT_UNMOUNTING_SIGTERM ||
451 state == MOUNT_REMOUNTING_SIGTERM) ? SIGTERM : SIGKILL;
452
453 if (m->kill_mode == KILL_CONTROL_GROUP) {
454
455 if ((r = cgroup_bonding_kill_list(UNIT(m)->meta.cgroup_bondings, sig)) < 0) {
456 if (r != -EAGAIN && r != -ESRCH)
457 goto fail;
458 } else
459 sent = true;
460 }
461
462 if (!sent)
463 if (kill(m->kill_mode == KILL_PROCESS ? m->control_pid : -m->control_pid, sig) < 0 && errno != ESRCH) {
464 r = -errno;
465 goto fail;
466 }
467 }
468
469 mount_set_state(m, state);
470
471 if (m->control_pid <= 0)
472 mount_enter_dead(m, true);
473
474 return;
475
476fail:
477 log_warning("%s failed to kill processes: %s", unit_id(UNIT(m)), strerror(-r));
478 mount_enter_dead(m, false);
479}
480
481static void mount_enter_mounted(Mount *m, bool success) {
482 assert(m);
483
484 if (!success)
485 m->failure = true;
486
487 mount_set_state(m, MOUNT_MOUNTED);
488}
489
490static void mount_enter_unmounting(Mount *m, bool success) {
491 ExecCommand *c;
492 int r;
493
494 assert(m);
495
496 if (!success)
497 m->failure = true;
498
499 m->control_command = c = m->exec_command + MOUNT_EXEC_UNMOUNT;
500
501 if ((r = exec_command_set(
502 c,
503 "/bin/umount",
504 m->where,
505 NULL)) < 0)
506 goto fail;
507
508 if ((r = mount_spawn(m, c, &m->control_pid)) < 0)
509 goto fail;
510
511 mount_set_state(m, MOUNT_UNMOUNTING);
512
513 return;
514
515fail:
516 log_warning("%s failed to run umount exectuable: %s", unit_id(UNIT(m)), strerror(-r));
517 mount_enter_mounted(m, false);
518}
519
520static void mount_enter_mounting(Mount *m, bool success) {
521 ExecCommand *c;
522 int r;
523
524 assert(m);
525
526 if (!success)
527 m->failure = true;
528
529 m->control_command = c = m->exec_command + MOUNT_EXEC_MOUNT;
530
531 if (m->from_fragment)
532 r = exec_command_set(
533 c,
534 "/bin/mount",
535 m->parameters_fragment.what,
536 m->where,
537 "-t", m->parameters_fragment.fstype,
538 "-o", m->parameters_fragment.options,
539 NULL);
540 else if (m->from_etc_fstab)
541 r = exec_command_set(
542 c,
543 "/bin/mount",
544 m->where,
545 NULL);
546 else
547 r = -ENOENT;
548
549 if (r < 0)
550 goto fail;
551
552 if ((r = mount_spawn(m, c, &m->control_pid)) < 0)
553 goto fail;
554
555 mount_set_state(m, MOUNT_MOUNTING);
556
557 return;
558
559fail:
560 log_warning("%s failed to run mount exectuable: %s", unit_id(UNIT(m)), strerror(-r));
561 mount_enter_dead(m, false);
562}
563
564static void mount_enter_mounting_done(Mount *m, bool success) {
565 assert(m);
566
567 if (!success)
568 m->failure = true;
569
570 mount_set_state(m, MOUNT_MOUNTING_DONE);
571}
572
573static void mount_enter_remounting(Mount *m, bool success) {
574 ExecCommand *c;
575 int r;
576
577 assert(m);
578
579 if (!success)
580 m->failure = true;
581
582 m->control_command = c = m->exec_command + MOUNT_EXEC_REMOUNT;
583
584 if (m->from_fragment) {
585 char *buf = NULL;
586 const char *o;
587
588 if (m->parameters_fragment.options) {
589 if (!(buf = strappend("remount,", m->parameters_fragment.options))) {
590 r = -ENOMEM;
591 goto fail;
592 }
593
594 o = buf;
595 } else
596 o = "remount";
597
598 r = exec_command_set(
599 c,
600 "/bin/mount",
601 m->parameters_fragment.what,
602 m->where,
603 "-t", m->parameters_fragment.fstype,
604 "-o", o,
605 NULL);
606
607 free(buf);
608 } else if (m->from_etc_fstab)
609 r = exec_command_set(
610 c,
611 "/bin/mount",
612 m->where,
613 "-o", "remount",
614 NULL);
615 else
616 r = -ENOENT;
617
618 if (r < 0) {
619 r = -ENOMEM;
620 goto fail;
621 }
622
623 if ((r = mount_spawn(m, c, &m->control_pid)) < 0)
624 goto fail;
625
626 mount_set_state(m, MOUNT_REMOUNTING);
627
628 return;
629
630fail:
631 mount_enter_mounted(m, false);
632}
633
634static int mount_start(Unit *u) {
635 Mount *m = MOUNT(u);
636
637 assert(m);
638
639 /* We cannot fulfill this request right now, try again later
640 * please! */
641 if (m->state == MOUNT_UNMOUNTING ||
642 m->state == MOUNT_UNMOUNTING_SIGTERM ||
643 m->state == MOUNT_UNMOUNTING_SIGKILL)
644 return -EAGAIN;
645
646 /* Already on it! */
647 if (m->state == MOUNT_MOUNTING ||
648 m->state == MOUNT_MOUNTING_SIGTERM ||
649 m->state == MOUNT_MOUNTING_SIGKILL)
650 return 0;
651
652 assert(m->state == MOUNT_DEAD || m->state == MOUNT_MAINTAINANCE);
653
654 m->failure = false;
655
656 mount_enter_mounting(m, true);
657 return 0;
658}
659
660static int mount_stop(Unit *u) {
661 Mount *m = MOUNT(u);
662
663 assert(m);
664
665 /* Cann't do this right now. */
666 if (m->state == MOUNT_MOUNTING ||
667 m->state == MOUNT_MOUNTING_DONE ||
668 m->state == MOUNT_MOUNTING_SIGTERM ||
669 m->state == MOUNT_MOUNTING_SIGKILL ||
670 m->state == MOUNT_REMOUNTING ||
671 m->state == MOUNT_REMOUNTING_SIGTERM ||
672 m->state == MOUNT_REMOUNTING_SIGKILL)
673 return -EAGAIN;
674
675 /* Already on it */
676 if (m->state == MOUNT_UNMOUNTING ||
677 m->state == MOUNT_UNMOUNTING_SIGKILL ||
678 m->state == MOUNT_UNMOUNTING_SIGTERM)
679 return 0;
680
681 assert(m->state == MOUNT_MOUNTED);
682
683 mount_enter_unmounting(m, true);
684 return 0;
685}
686
687static int mount_reload(Unit *u) {
688 Mount *m = MOUNT(u);
689
690 assert(m);
691
692 if (m->state == MOUNT_MOUNTING_DONE)
693 return -EAGAIN;
694
695 assert(m->state == MOUNT_MOUNTED);
696
697 mount_enter_remounting(m, true);
698 return 0;
699}
700
701static UnitActiveState mount_active_state(Unit *u) {
702 assert(u);
703
704 return state_translation_table[MOUNT(u)->state];
705}
706
707static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
708 Mount *m = MOUNT(u);
709 bool success;
710
711 assert(m);
712 assert(pid >= 0);
713
714 success = code == CLD_EXITED && status == 0;
715 m->failure = m->failure || !success;
716
717 assert(m->control_pid == pid);
718 assert(m->control_command);
719
720 exec_status_fill(&m->control_command->exec_status, pid, code, status);
721 m->control_pid = 0;
722
723 log_debug("%s control process exited, code=%s status=%i", unit_id(u), sigchld_code_to_string(code), status);
724
725 /* Note that mount(8) returning and the kernel sending us a
726 * mount table change event might happen out-of-order. If an
727 * operation succeed we assume the kernel will follow soon too
728 * and already change into the resulting state. If it fails
729 * we check if the kernel still knows about the mount. and
730 * change state accordingly. */
731
732 switch (m->state) {
733
734 case MOUNT_MOUNTING:
735 case MOUNT_MOUNTING_DONE:
736 case MOUNT_MOUNTING_SIGKILL:
737 case MOUNT_MOUNTING_SIGTERM:
738 case MOUNT_REMOUNTING:
739 case MOUNT_REMOUNTING_SIGKILL:
740 case MOUNT_REMOUNTING_SIGTERM:
741
742 if (success && m->from_proc_self_mountinfo)
743 mount_enter_mounted(m, true);
744 else if (m->from_proc_self_mountinfo)
745 mount_enter_mounted(m, false);
746 else
747 mount_enter_dead(m, false);
748 break;
749
750 case MOUNT_UNMOUNTING:
751 case MOUNT_UNMOUNTING_SIGKILL:
752 case MOUNT_UNMOUNTING_SIGTERM:
753
754 if (success)
755 mount_enter_dead(m, true);
756 else if (m->from_proc_self_mountinfo)
757 mount_enter_mounted(m, false);
758 else
759 mount_enter_dead(m, false);
760 break;
761
762 default:
763 assert_not_reached("Uh, control process died at wrong time.");
764 }
765}
766
767static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
768 Mount *m = MOUNT(u);
769
770 assert(m);
771 assert(elapsed == 1);
772 assert(w == &m->timer_watch);
773
774 switch (m->state) {
775
776 case MOUNT_MOUNTING:
777 case MOUNT_MOUNTING_DONE:
778 log_warning("%s mounting timed out. Stopping.", unit_id(u));
779 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false);
780 break;
781
782 case MOUNT_REMOUNTING:
783 log_warning("%s remounting timed out. Stopping.", unit_id(u));
784 mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, false);
785 break;
786
787 case MOUNT_UNMOUNTING:
788 log_warning("%s unmounting timed out. Stopping.", unit_id(u));
789 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false);
790 break;
791
792 case MOUNT_MOUNTING_SIGTERM:
793 log_warning("%s mounting timed out. Killing.", unit_id(u));
794 mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false);
795 break;
796
797 case MOUNT_REMOUNTING_SIGTERM:
798 log_warning("%s remounting timed out. Killing.", unit_id(u));
799 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false);
800 break;
801
802 case MOUNT_UNMOUNTING_SIGTERM:
803 log_warning("%s unmounting timed out. Killing.", unit_id(u));
804 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false);
805 break;
806
807 case MOUNT_MOUNTING_SIGKILL:
808 case MOUNT_REMOUNTING_SIGKILL:
809 case MOUNT_UNMOUNTING_SIGKILL:
810 log_warning("%s mount process still around after SIGKILL. Ignoring.", unit_id(u));
811
812 if (m->from_proc_self_mountinfo)
813 mount_enter_mounted(m, false);
814 else
815 mount_enter_dead(m, false);
816 break;
817
818 default:
819 assert_not_reached("Timeout at wrong time.");
820 }
821}
822
823static int mount_add_one(
824 Manager *m,
825 const char *what,
826 const char *where,
827 const char *options,
828 const char *fstype,
829 bool from_proc_self_mountinfo,
830 bool set_flags) {
b08d03ff
LP		 831 int r;
832 Unit *u;
833 bool delete;
e537352b
LP		 834 char *e, *w = NULL, *o = NULL, *f = NULL;
835 MountParameters *mp;
b08d03ff 836
f50e0a01 837 assert(m);
b08d03ff
LP		 838 assert(what);
839 assert(where);
e537352b
LP		 840 assert(options);
841 assert(fstype);
842
843 assert(!set_flags || from_proc_self_mountinfo);
844
845 /* Ignore API mount points. They should never be referenced in
846 * dependencies ever. */
847 if (mount_point_is_api(where))
848 return 0;
b08d03ff
LP		 849
850 /* probably some kind of swap, which we don't cover for now */
851 if (where[0] != '/')
852 return 0;
853
854 if (streq(where, "/"))
2e478a46 855 e = strdup("-.mount");
b08d03ff 856 else
2e478a46 857 e = unit_name_escape_path(where+1, ".mount");
b08d03ff
LP		 858
859 if (!e)
860 return -ENOMEM;
861
862 if (!(u = manager_get_unit(m, e))) {
863 delete = true;
864
865 if (!(u = unit_new(m))) {
866 free(e);
867 return -ENOMEM;
868 }
869
870 r = unit_add_name(u, e);
871 free(e);
872
873 if (r < 0)
874 goto fail;
875
e537352b 876 if (!(MOUNT(u)->where = strdup(where))) {
f50e0a01
LP		 877 r = -ENOMEM;
878 goto fail;
879 }
880
881 if ((r = unit_set_description(u, where)) < 0)
b08d03ff 882 goto fail;
ef734fd6 883
f94ea366 884 unit_add_to_load_queue(u);
b08d03ff
LP		 885 } else {
886 delete = false;
887 free(e);
888 }
889
e537352b
LP		 890 if (!(w = strdup(what)) ||
891 !(o = strdup(options)) ||
892 !(f = strdup(fstype))) {
893 r = -ENOMEM;
894 goto fail;
895 }
896
897 if (from_proc_self_mountinfo) {
898 mp = &MOUNT(u)->parameters_proc_self_mountinfo;
899
900 if (set_flags) {
901 MOUNT(u)->is_mounted = true;
902 MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
903 MOUNT(u)->just_changed = !streq_ptr(MOUNT(u)->parameters_proc_self_mountinfo.options, o);
904 }
ef734fd6 905
f50e0a01 906 MOUNT(u)->from_proc_self_mountinfo = true;
e537352b 907
ef734fd6 908 } else {
e537352b
LP		 909 mp = &MOUNT(u)->parameters_etc_fstab;
910
f50e0a01 911 MOUNT(u)->from_etc_fstab = true;
ef734fd6 912 }
f50e0a01 913
e537352b
LP		 914 free(mp->what);
915 mp->what = w;
b08d03ff 916
e537352b
LP		 917 free(mp->options);
918 mp->options = o;
919
920 free(mp->fstype);
921 mp->fstype = f;
b08d03ff 922
c1e1601e
LP		 923 unit_add_to_dbus_queue(u);
924
b08d03ff
LP		 925 return 0;
926
927fail:
e537352b
LP		 928 free(w);
929 free(o);
930 free(f);
931
b08d03ff
LP		 932 if (delete && u)
933 unit_free(u);
934
935 return 0;
936}
937
938static char *fstab_node_to_udev_node(char *p) {
939 char *dn, *t;
940 int r;
941
942 /* FIXME: to follow udev's logic 100% we need to leave valid
943 * UTF8 chars unescaped */
944
945 if (startswith(p, "LABEL=")) {
946
f50e0a01 947 if (!(t = xescape(p+6, "/ ")))
b08d03ff
LP		 948 return NULL;
949
f50e0a01 950 r = asprintf(&dn, "/dev/disk/by-label/%s", t);
b08d03ff
LP		 951 free(t);
952
953 if (r < 0)
954 return NULL;
955
956 return dn;
957 }
958
959 if (startswith(p, "UUID=")) {
960
f50e0a01 961 if (!(t = xescape(p+5, "/ ")))
b08d03ff
LP		 962 return NULL;
963
f50e0a01 964 r = asprintf(&dn, "/dev/disk/by-uuid/%s", ascii_strlower(t));
b08d03ff
LP		 965 free(t);
966
967 if (r < 0)
968 return NULL;
969
970 return dn;
971 }
972
973 return strdup(p);
974}
975
e537352b 976static int mount_load_etc_fstab(Manager *m) {
b08d03ff
LP		 977 FILE *f;
978 int r;
979 struct mntent* me;
980
981 assert(m);
982
983 errno = 0;
984 if (!(f = setmntent("/etc/fstab", "r")))
985 return -errno;
986
987 while ((me = getmntent(f))) {
988 char *where, *what;
989
990 if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
991 r = -ENOMEM;
992 goto finish;
993 }
994
995 if (!(where = strdup(me->mnt_dir))) {
996 free(what);
997 r = -ENOMEM;
998 goto finish;
999 }
1000
1001 if (what[0] == '/')
1002 path_kill_slashes(what);
1003
1004 if (where[0] == '/')
1005 path_kill_slashes(where);
1006
e537352b 1007 r = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, false, false);
b08d03ff
LP		 1008 free(what);
1009 free(where);
1010
1011 if (r < 0)
1012 goto finish;
1013 }
1014
1015 r = 0;
1016finish:
1017
1018 endmntent(f);
1019 return r;
1020}
1021
ef734fd6 1022static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
b08d03ff 1023 int r;
e537352b 1024 char *device, *path, *options, *fstype, *d, *p;
b08d03ff
LP		 1025
1026 assert(m);
1027
ef734fd6 1028 rewind(m->proc_self_mountinfo);
b08d03ff
LP		 1029
1030 for (;;) {
1031 int k;
e537352b
LP		 1032
1033 device = path = options = fstype = d = p = NULL;
b08d03ff 1034
ef734fd6 1035 if ((k = fscanf(m->proc_self_mountinfo,
b08d03ff
LP		 1036 "%*s " /* (1) mount id */
1037 "%*s " /* (2) parent id */
1038 "%*s " /* (3) major:minor */
1039 "%*s " /* (4) root */
1040 "%ms " /* (5) mount point */
e537352b 1041 "%ms" /* (6) mount options */
b08d03ff
LP		 1042 "%*[^-]" /* (7) optional fields */
1043 "- " /* (8) seperator */
e537352b 1044 "%ms " /* (9) file system type */
ef734fd6
LP		 1045 "%ms" /* (10) mount source */
1046 "%*[^\n]", /* some rubbish at the end */
b08d03ff 1047 &path,
e537352b
LP		 1048 &options,
1049 &fstype,
1050 &device)) != 4) {
b08d03ff 1051
ef734fd6
LP		 1052 if (k == EOF)
1053 break;
b08d03ff 1054
e537352b
LP		 1055 r = -EBADMSG;
1056 goto finish;
b08d03ff
LP		 1057 }
1058
e537352b
LP		 1059 if (!(d = cunescape(device)) ||
1060 !(p = cunescape(path))) {
1061 r = -ENOMEM;
1062 goto finish;
b08d03ff 1063 }
b08d03ff 1064
e537352b
LP		 1065 if ((r = mount_add_one(m, d, p, options, fstype, true, set_flags)) < 0)
1066 goto finish;
b08d03ff 1067
e537352b
LP		 1068 free(device);
1069 free(path);
1070 free(options);
1071 free(fstype);
b08d03ff
LP		 1072 free(d);
1073 free(p);
b08d03ff
LP		 1074 }
1075
e537352b
LP		 1076 r = 0;
1077
1078finish:
1079 free(device);
1080 free(path);
1081 free(options);
1082 free(fstype);
1083 free(d);
1084 free(p);
1085
1086 return r;
1087}
1088
1089static void mount_shutdown(Manager *m) {
1090 assert(m);
1091
1092 if (m->proc_self_mountinfo)
1093 fclose(m->proc_self_mountinfo);
b08d03ff
LP		 1094}
1095
1096static int mount_enumerate(Manager *m) {
1097 int r;
ef734fd6 1098 struct epoll_event ev;
b08d03ff
LP		 1099 assert(m);
1100
ef734fd6
LP		 1101 if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "r")))
1102 return -errno;
1103
1104 m->mount_watch.type = WATCH_MOUNT;
1105 m->mount_watch.fd = fileno(m->proc_self_mountinfo);
1106
1107 zero(ev);
1108 ev.events = EPOLLERR;
1109 ev.data.ptr = &m->mount_watch;
1110
1111 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
1112 return -errno;
1113
e537352b 1114 if ((r = mount_load_etc_fstab(m)) < 0)
b08d03ff
LP		 1115 goto fail;
1116
ef734fd6 1117 if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
b08d03ff
LP		 1118 goto fail;
1119
1120 return 0;
1121
1122fail:
1123 mount_shutdown(m);
1124 return r;
5cb5a6ff
LP		 1125}
1126
ef734fd6
LP		 1127void mount_fd_event(Manager *m, int events) {
1128 Meta *meta;
1129 int r;
1130
1131 assert(m);
f94ea366 1132 assert(events == EPOLLERR);
ef734fd6
LP		 1133
1134 /* The manager calls this for every fd event happening on the
1135 * /proc/self/mountinfo file, which informs us about mounting
1136 * table changes */
1137
1138 if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
1139 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-errno));
e537352b
LP		 1140
1141 /* Reset flags, just in case, for later calls */
1142 LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1143 Mount *mount = (Mount*) meta;
1144
1145 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1146 }
1147
ef734fd6
LP		 1148 return;
1149 }
1150
1151 manager_dispatch_load_queue(m);
1152
1153 LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1154 Mount *mount = (Mount*) meta;
1155
e537352b
LP		 1156 if (!mount->is_mounted) {
1157 /* This has just been unmounted. */
1158
ef734fd6 1159 mount->from_proc_self_mountinfo = false;
e537352b
LP		 1160
1161 switch (mount->state) {
1162
1163 case MOUNT_MOUNTED:
1164 mount_enter_dead(mount, true);
1165 break;
1166
1167 default:
1168 mount_set_state(mount, mount->state);
1169 break;
1170
1171 }
1172
1173 } else if (mount->just_mounted || mount->just_changed) {
1174
1175 /* New or changed entrymount */
1176
1177 switch (mount->state) {
1178
1179 case MOUNT_DEAD:
1180 case MOUNT_MAINTAINANCE:
1181 mount_enter_mounted(mount, true);
1182 break;
1183
1184 case MOUNT_MOUNTING:
1185 mount_enter_mounting_done(mount, true);
1186 break;
1187
1188 default:
1189 /* Nothing really changed, but let's
1190 * issue an notification call
1191 * nonetheless, in case somebody is
1192 * waiting for this. (e.g. file system
1193 * ro/rw remounts.) */
1194 mount_set_state(mount, mount->state);
1195 break;
1196 }
1197 }
1198
1199 /* Reset the flags for later calls */
1200 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1201 }
1202}
1203
1204int mount_path_is_mounted(Manager *m, const char* path) {
1205 char *t;
1206 int r;
1207
1208 assert(m);
1209 assert(path);
1210
1211 if (path[0] != '/')
1212 return 1;
1213
1214 if (!(t = strdup(path)))
1215 return -ENOMEM;
1216
1217 path_kill_slashes(t);
1218
1219 for (;;) {
1220 char *e, *slash;
1221 Unit *u;
1222
1223 if (!(e = unit_name_escape_path(t+1, ".mount"))) {
1224 r = -ENOMEM;
1225 goto finish;
1226 }
1227
1228 u = manager_get_unit(m, e);
1229 free(e);
1230
1231 if (u &&
1232 (MOUNT(u)->from_etc_fstab || MOUNT(u)->from_fragment) &&
1233 MOUNT(u)->state != MOUNT_MOUNTED) {
1234 r = 0;
1235 goto finish;
ef734fd6
LP		 1236 }
1237
e537352b
LP		 1238 assert_se(slash = strrchr(t, '/'));
1239
1240 if (slash == t) {
1241 r = 1;
1242 goto finish;
1243 }
1244
1245 *slash = 0;
ef734fd6 1246 }
e537352b
LP		 1247
1248 r = 1;
1249
1250finish:
1251 free(t);
1252 return r;
ef734fd6
LP		 1253}
1254
87f0e418 1255const UnitVTable mount_vtable = {
5cb5a6ff
LP		 1256 .suffix = ".mount",
1257
e537352b
LP		 1258 .no_alias = true,
1259
1260 .init = mount_init,
1261 .load = mount_load,
034c6ed7 1262 .done = mount_done,
e537352b 1263
f50e0a01
LP		 1264 .coldplug = mount_coldplug,
1265
034c6ed7 1266 .dump = mount_dump,
5cb5a6ff 1267
e537352b
LP		 1268 .start = mount_start,
1269 .stop = mount_stop,
1270 .reload = mount_reload,
1271
f50e0a01 1272 .active_state = mount_active_state,
b08d03ff 1273
e537352b
LP		 1274 .sigchld_event = mount_sigchld_event,
1275 .timer_event = mount_timer_event,
1276
f50e0a01
LP		 1277 .enumerate = mount_enumerate,
1278 .shutdown = mount_shutdown
5cb5a6ff 1279};
Michael's branch of systemd.