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[thirdparty/systemd.git] / src / mount.c
1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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 #include "dbus-mount.h"
37 #include "special.h"
38 #include "bus-errors.h"
39 #include "exit-status.h"
40 #include "def.h"
41
42 static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
43 [MOUNT_DEAD] = UNIT_INACTIVE,
44 [MOUNT_MOUNTING] = UNIT_ACTIVATING,
45 [MOUNT_MOUNTING_DONE] = UNIT_ACTIVE,
46 [MOUNT_MOUNTED] = UNIT_ACTIVE,
47 [MOUNT_REMOUNTING] = UNIT_RELOADING,
48 [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
49 [MOUNT_MOUNTING_SIGTERM] = UNIT_DEACTIVATING,
50 [MOUNT_MOUNTING_SIGKILL] = UNIT_DEACTIVATING,
51 [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING,
52 [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING,
53 [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
54 [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
55 [MOUNT_FAILED] = UNIT_FAILED
56 };
57
58 static void mount_init(Unit *u) {
59 Mount *m = MOUNT(u);
60
61 assert(u);
62 assert(u->meta.load_state == UNIT_STUB);
63
64 m->timeout_usec = DEFAULT_TIMEOUT_USEC;
65 m->directory_mode = 0755;
66
67 exec_context_init(&m->exec_context);
68
69 /* The stdio/kmsg bridge socket is on /, in order to avoid a
70 * dep loop, don't use kmsg logging for -.mount */
71 if (!unit_has_name(u, "-.mount"))
72 m->exec_context.std_output = EXEC_OUTPUT_KMSG;
73
74 /* We need to make sure that /bin/mount is always called in
75 * the same process group as us, so that the autofs kernel
76 * side doesn't send us another mount request while we are
77 * already trying to comply its last one. */
78 m->exec_context.same_pgrp = true;
79
80 m->timer_watch.type = WATCH_INVALID;
81
82 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
83
84 m->meta.ignore_on_isolate = true;
85 }
86
87 static void mount_unwatch_control_pid(Mount *m) {
88 assert(m);
89
90 if (m->control_pid <= 0)
91 return;
92
93 unit_unwatch_pid(UNIT(m), m->control_pid);
94 m->control_pid = 0;
95 }
96
97 static void mount_parameters_done(MountParameters *p) {
98 assert(p);
99
100 free(p->what);
101 free(p->options);
102 free(p->fstype);
103
104 p->what = p->options = p->fstype = NULL;
105 }
106
107 static void mount_done(Unit *u) {
108 Mount *m = MOUNT(u);
109 Meta *other;
110
111 assert(m);
112
113 free(m->where);
114 m->where = NULL;
115
116 /* Try to detach us from the automount unit if there is any */
117 LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_AUTOMOUNT]) {
118 Automount *a = (Automount*) other;
119
120 if (a->mount == m)
121 a->mount = NULL;
122 }
123
124 mount_parameters_done(&m->parameters_etc_fstab);
125 mount_parameters_done(&m->parameters_proc_self_mountinfo);
126 mount_parameters_done(&m->parameters_fragment);
127
128 exec_context_done(&m->exec_context);
129 exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
130 m->control_command = NULL;
131
132 mount_unwatch_control_pid(m);
133
134 unit_unwatch_timer(u, &m->timer_watch);
135 }
136
137 static MountParameters* get_mount_parameters_configured(Mount *m) {
138 assert(m);
139
140 if (m->from_fragment)
141 return &m->parameters_fragment;
142 else if (m->from_etc_fstab)
143 return &m->parameters_etc_fstab;
144
145 return NULL;
146 }
147
148 static MountParameters* get_mount_parameters(Mount *m) {
149 assert(m);
150
151 if (m->from_proc_self_mountinfo)
152 return &m->parameters_proc_self_mountinfo;
153
154 return get_mount_parameters_configured(m);
155 }
156
157 static int mount_add_mount_links(Mount *m) {
158 Meta *other;
159 int r;
160 MountParameters *pm;
161
162 assert(m);
163
164 pm = get_mount_parameters_configured(m);
165
166 /* Adds in links to other mount points that might lie below or
167 * above us in the hierarchy */
168
169 LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_MOUNT]) {
170 Mount *n = (Mount*) other;
171 MountParameters *pn;
172
173 if (n == m)
174 continue;
175
176 if (n->meta.load_state != UNIT_LOADED)
177 continue;
178
179 pn = get_mount_parameters_configured(n);
180
181 if (path_startswith(m->where, n->where)) {
182
183 if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
184 return r;
185
186 if (pn)
187 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
188 return r;
189
190 } else if (path_startswith(n->where, m->where)) {
191
192 if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
193 return r;
194
195 if (pm)
196 if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
197 return r;
198
199 } else if (pm && path_startswith(pm->what, n->where)) {
200
201 if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
202 return r;
203
204 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
205 return r;
206
207 } else if (pn && path_startswith(pn->what, m->where)) {
208
209 if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
210 return r;
211
212 if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
213 return r;
214 }
215 }
216
217 return 0;
218 }
219
220 static int mount_add_swap_links(Mount *m) {
221 Meta *other;
222 int r;
223
224 assert(m);
225
226 LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_SWAP])
227 if ((r = swap_add_one_mount_link((Swap*) other, m)) < 0)
228 return r;
229
230 return 0;
231 }
232
233 static int mount_add_path_links(Mount *m) {
234 Meta *other;
235 int r;
236
237 assert(m);
238
239 LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_PATH])
240 if ((r = path_add_one_mount_link((Path*) other, m)) < 0)
241 return r;
242
243 return 0;
244 }
245
246 static int mount_add_automount_links(Mount *m) {
247 Meta *other;
248 int r;
249
250 assert(m);
251
252 LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_AUTOMOUNT])
253 if ((r = automount_add_one_mount_link((Automount*) other, m)) < 0)
254 return r;
255
256 return 0;
257 }
258
259 static int mount_add_socket_links(Mount *m) {
260 Meta *other;
261 int r;
262
263 assert(m);
264
265 LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_SOCKET])
266 if ((r = socket_add_one_mount_link((Socket*) other, m)) < 0)
267 return r;
268
269 return 0;
270 }
271
272 static char* mount_test_option(const char *haystack, const char *needle) {
273 struct mntent me;
274
275 assert(needle);
276
277 /* Like glibc's hasmntopt(), but works on a string, not a
278 * struct mntent */
279
280 if (!haystack)
281 return false;
282
283 zero(me);
284 me.mnt_opts = (char*) haystack;
285
286 return hasmntopt(&me, needle);
287 }
288
289 static bool mount_is_network(MountParameters *p) {
290 assert(p);
291
292 if (mount_test_option(p->options, "_netdev"))
293 return true;
294
295 if (p->fstype && fstype_is_network(p->fstype))
296 return true;
297
298 return false;
299 }
300
301 static bool mount_is_bind(MountParameters *p) {
302 assert(p);
303
304 if (mount_test_option(p->options, "bind"))
305 return true;
306
307 if (p->fstype && streq(p->fstype, "bind"))
308 return true;
309
310 return false;
311 }
312
313 static bool needs_quota(MountParameters *p) {
314 assert(p);
315
316 if (mount_is_network(p))
317 return false;
318
319 if (mount_is_bind(p))
320 return false;
321
322 return mount_test_option(p->options, "usrquota") ||
323 mount_test_option(p->options, "grpquota");
324 }
325
326 static int mount_add_fstab_links(Mount *m) {
327 const char *target, *after = NULL;
328 MountParameters *p;
329 Unit *tu;
330 int r;
331 bool noauto, nofail, handle, automount;
332
333 assert(m);
334
335 if (m->meta.manager->running_as != MANAGER_SYSTEM)
336 return 0;
337
338 if (!(p = get_mount_parameters_configured(m)))
339 return 0;
340
341 if (p != &m->parameters_etc_fstab)
342 return 0;
343
344 noauto = !!mount_test_option(p->options, "noauto");
345 nofail = !!mount_test_option(p->options, "nofail");
346 automount =
347 mount_test_option(p->options, "comment=systemd.automount") ||
348 mount_test_option(p->options, "x-systemd-automount");
349 handle =
350 automount ||
351 mount_test_option(p->options, "comment=systemd.mount") ||
352 mount_test_option(p->options, "x-systemd-mount") ||
353 m->meta.manager->mount_auto;
354
355 if (mount_is_network(p)) {
356 target = SPECIAL_REMOTE_FS_TARGET;
357 after = SPECIAL_NETWORK_TARGET;
358 } else
359 target = SPECIAL_LOCAL_FS_TARGET;
360
361 if (!path_equal(m->where, "/"))
362 if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
363 return r;
364
365 if ((r = manager_load_unit(m->meta.manager, target, NULL, NULL, &tu)) < 0)
366 return r;
367
368 if (after)
369 if ((r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, NULL, true)) < 0)
370 return r;
371
372 if (automount) {
373 Unit *am;
374
375 if ((r = unit_load_related_unit(UNIT(m), ".automount", &am)) < 0)
376 return r;
377
378 /* If auto is configured as well also pull in the
379 * mount right-away, but don't rely on it. */
380 if (!noauto) /* automount + auto */
381 if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true)) < 0)
382 return r;
383
384 /* Install automount unit */
385 if (!nofail) /* automount + fail */
386 return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_REQUIRES, UNIT(am), true);
387 else /* automount + nofail */
388 return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_WANTS, UNIT(am), true);
389
390 } else if (handle && !noauto) {
391
392 /* Automatically add mount points that aren't natively
393 * configured to local-fs.target */
394
395 if (!nofail) /* auto + fail */
396 return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true);
397 else /* auto + nofail */
398 return unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true);
399 }
400
401 return 0;
402 }
403
404 static int mount_add_device_links(Mount *m) {
405 MountParameters *p;
406 int r;
407
408 assert(m);
409
410 if (!(p = get_mount_parameters_configured(m)))
411 return 0;
412
413 if (!p->what)
414 return 0;
415
416 if (!mount_is_bind(p) &&
417 !path_equal(m->where, "/") &&
418 p == &m->parameters_etc_fstab) {
419 bool nofail, noauto;
420
421 noauto = !!mount_test_option(p->options, "noauto");
422 nofail = !!mount_test_option(p->options, "nofail");
423
424 if ((r = unit_add_node_link(UNIT(m), p->what,
425 !noauto && nofail &&
426 UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM)) < 0)
427 return r;
428 }
429
430 if (p->passno > 0 &&
431 !mount_is_bind(p) &&
432 UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM &&
433 !path_equal(m->where, "/")) {
434 char *name;
435 Unit *fsck;
436 /* Let's add in the fsck service */
437
438 /* aka SPECIAL_FSCK_SERVICE */
439 if (!(name = unit_name_from_path_instance("fsck", p->what, ".service")))
440 return -ENOMEM;
441
442 if ((r = manager_load_unit_prepare(m->meta.manager, name, NULL, NULL, &fsck)) < 0) {
443 log_warning("Failed to prepare unit %s: %s", name, strerror(-r));
444 free(name);
445 return r;
446 }
447
448 free(name);
449
450 SERVICE(fsck)->fsck_passno = p->passno;
451
452 if ((r = unit_add_two_dependencies(UNIT(m), UNIT_AFTER, UNIT_REQUIRES, fsck, true)) < 0)
453 return r;
454 }
455
456 return 0;
457 }
458
459 static int mount_add_default_dependencies(Mount *m) {
460 int r;
461
462 assert(m);
463
464 if (m->meta.manager->running_as == MANAGER_SYSTEM &&
465 !path_equal(m->where, "/")) {
466 MountParameters *p;
467
468 p = get_mount_parameters_configured(m);
469
470 if (p && needs_quota(p)) {
471 if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, NULL, true)) < 0 ||
472 (r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, NULL, true)) < 0)
473 return r;
474 }
475
476 if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
477 return r;
478 }
479
480 return 0;
481 }
482
483 static int mount_fix_timeouts(Mount *m) {
484 MountParameters *p;
485 const char *timeout = NULL;
486 Unit *other;
487 Iterator i;
488 usec_t u;
489 char *t;
490 int r;
491
492 assert(m);
493
494 if (!(p = get_mount_parameters_configured(m)))
495 return 0;
496
497 /* Allow configuration how long we wait for a device that
498 * backs a mount point to show up. This is useful to support
499 * endless device timeouts for devices that show up only after
500 * user input, like crypto devices. */
501
502 if ((timeout = mount_test_option(p->options, "comment=systemd.device-timeout")))
503 timeout += 31;
504 else if ((timeout = mount_test_option(p->options, "x-systemd-device-timeout")))
505 timeout += 25;
506 else
507 return 0;
508
509 t = strndup(timeout, strcspn(timeout, ",;" WHITESPACE));
510 if (!t)
511 return -ENOMEM;
512
513 r = parse_usec(t, &u);
514 free(t);
515
516 if (r < 0) {
517 log_warning("Failed to parse timeout for %s, ignoring: %s", m->where, timeout);
518 return r;
519 }
520
521 SET_FOREACH(other, m->meta.dependencies[UNIT_AFTER], i) {
522 if (other->meta.type != UNIT_DEVICE)
523 continue;
524
525 other->meta.job_timeout = u;
526 }
527
528 return 0;
529 }
530
531 static int mount_verify(Mount *m) {
532 bool b;
533 char *e;
534 assert(m);
535
536 if (m->meta.load_state != UNIT_LOADED)
537 return 0;
538
539 if (!m->from_etc_fstab && !m->from_fragment && !m->from_proc_self_mountinfo)
540 return -ENOENT;
541
542 if (!(e = unit_name_from_path(m->where, ".mount")))
543 return -ENOMEM;
544
545 b = unit_has_name(UNIT(m), e);
546 free(e);
547
548 if (!b) {
549 log_error("%s's Where setting doesn't match unit name. Refusing.", m->meta.id);
550 return -EINVAL;
551 }
552
553 if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
554 log_error("Cannot create mount unit for API file system %s. Refusing.", m->where);
555 return -EINVAL;
556 }
557
558 if (m->meta.fragment_path && !m->parameters_fragment.what) {
559 log_error("%s's What setting is missing. Refusing.", m->meta.id);
560 return -EBADMSG;
561 }
562
563 if (m->exec_context.pam_name && m->exec_context.kill_mode != KILL_CONTROL_GROUP) {
564 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", m->meta.id);
565 return -EINVAL;
566 }
567
568 return 0;
569 }
570
571 static int mount_load(Unit *u) {
572 Mount *m = MOUNT(u);
573 int r;
574
575 assert(u);
576 assert(u->meta.load_state == UNIT_STUB);
577
578 if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
579 return r;
580
581 /* This is a new unit? Then let's add in some extras */
582 if (u->meta.load_state == UNIT_LOADED) {
583 if ((r = unit_add_exec_dependencies(u, &m->exec_context)) < 0)
584 return r;
585
586 if (m->meta.fragment_path)
587 m->from_fragment = true;
588 else if (m->from_etc_fstab)
589 m->meta.default_dependencies = false;
590
591 if (!m->where)
592 if (!(m->where = unit_name_to_path(u->meta.id)))
593 return -ENOMEM;
594
595 path_kill_slashes(m->where);
596
597 if (!m->meta.description)
598 if ((r = unit_set_description(u, m->where)) < 0)
599 return r;
600
601 if ((r = mount_add_device_links(m)) < 0)
602 return r;
603
604 if ((r = mount_add_mount_links(m)) < 0)
605 return r;
606
607 if ((r = mount_add_socket_links(m)) < 0)
608 return r;
609
610 if ((r = mount_add_swap_links(m)) < 0)
611 return r;
612
613 if ((r = mount_add_path_links(m)) < 0)
614 return r;
615
616 if ((r = mount_add_automount_links(m)) < 0)
617 return r;
618
619 if ((r = mount_add_fstab_links(m)) < 0)
620 return r;
621
622 if (m->meta.default_dependencies)
623 if ((r = mount_add_default_dependencies(m)) < 0)
624 return r;
625
626 if ((r = unit_add_default_cgroups(u)) < 0)
627 return r;
628
629 mount_fix_timeouts(m);
630 }
631
632 return mount_verify(m);
633 }
634
635 static int mount_notify_automount(Mount *m, int status) {
636 Unit *p;
637 int r;
638
639 assert(m);
640
641 if ((r = unit_get_related_unit(UNIT(m), ".automount", &p)) < 0)
642 return r == -ENOENT ? 0 : r;
643
644 return automount_send_ready(AUTOMOUNT(p), status);
645 }
646
647 static void mount_set_state(Mount *m, MountState state) {
648 MountState old_state;
649 assert(m);
650
651 old_state = m->state;
652 m->state = state;
653
654 if (state != MOUNT_MOUNTING &&
655 state != MOUNT_MOUNTING_DONE &&
656 state != MOUNT_REMOUNTING &&
657 state != MOUNT_UNMOUNTING &&
658 state != MOUNT_MOUNTING_SIGTERM &&
659 state != MOUNT_MOUNTING_SIGKILL &&
660 state != MOUNT_UNMOUNTING_SIGTERM &&
661 state != MOUNT_UNMOUNTING_SIGKILL &&
662 state != MOUNT_REMOUNTING_SIGTERM &&
663 state != MOUNT_REMOUNTING_SIGKILL) {
664 unit_unwatch_timer(UNIT(m), &m->timer_watch);
665 mount_unwatch_control_pid(m);
666 m->control_command = NULL;
667 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
668 }
669
670 if (state == MOUNT_MOUNTED ||
671 state == MOUNT_REMOUNTING)
672 mount_notify_automount(m, 0);
673 else if (state == MOUNT_DEAD ||
674 state == MOUNT_UNMOUNTING ||
675 state == MOUNT_MOUNTING_SIGTERM ||
676 state == MOUNT_MOUNTING_SIGKILL ||
677 state == MOUNT_REMOUNTING_SIGTERM ||
678 state == MOUNT_REMOUNTING_SIGKILL ||
679 state == MOUNT_UNMOUNTING_SIGTERM ||
680 state == MOUNT_UNMOUNTING_SIGKILL ||
681 state == MOUNT_FAILED)
682 mount_notify_automount(m, -ENODEV);
683
684 if (state != old_state)
685 log_debug("%s changed %s -> %s",
686 m->meta.id,
687 mount_state_to_string(old_state),
688 mount_state_to_string(state));
689
690 unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state], !m->reload_failure);
691 m->reload_failure = false;
692 }
693
694 static int mount_coldplug(Unit *u) {
695 Mount *m = MOUNT(u);
696 MountState new_state = MOUNT_DEAD;
697 int r;
698
699 assert(m);
700 assert(m->state == MOUNT_DEAD);
701
702 if (m->deserialized_state != m->state)
703 new_state = m->deserialized_state;
704 else if (m->from_proc_self_mountinfo)
705 new_state = MOUNT_MOUNTED;
706
707 if (new_state != m->state) {
708
709 if (new_state == MOUNT_MOUNTING ||
710 new_state == MOUNT_MOUNTING_DONE ||
711 new_state == MOUNT_REMOUNTING ||
712 new_state == MOUNT_UNMOUNTING ||
713 new_state == MOUNT_MOUNTING_SIGTERM ||
714 new_state == MOUNT_MOUNTING_SIGKILL ||
715 new_state == MOUNT_UNMOUNTING_SIGTERM ||
716 new_state == MOUNT_UNMOUNTING_SIGKILL ||
717 new_state == MOUNT_REMOUNTING_SIGTERM ||
718 new_state == MOUNT_REMOUNTING_SIGKILL) {
719
720 if (m->control_pid <= 0)
721 return -EBADMSG;
722
723 if ((r = unit_watch_pid(UNIT(m), m->control_pid)) < 0)
724 return r;
725
726 if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
727 return r;
728 }
729
730 mount_set_state(m, new_state);
731 }
732
733 return 0;
734 }
735
736 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
737 Mount *m = MOUNT(u);
738 MountParameters *p;
739
740 assert(m);
741 assert(f);
742
743 p = get_mount_parameters(m);
744
745 fprintf(f,
746 "%sMount State: %s\n"
747 "%sWhere: %s\n"
748 "%sWhat: %s\n"
749 "%sFile System Type: %s\n"
750 "%sOptions: %s\n"
751 "%sFrom /etc/fstab: %s\n"
752 "%sFrom /proc/self/mountinfo: %s\n"
753 "%sFrom fragment: %s\n"
754 "%sDirectoryMode: %04o\n",
755 prefix, mount_state_to_string(m->state),
756 prefix, m->where,
757 prefix, strna(p->what),
758 prefix, strna(p->fstype),
759 prefix, strna(p->options),
760 prefix, yes_no(m->from_etc_fstab),
761 prefix, yes_no(m->from_proc_self_mountinfo),
762 prefix, yes_no(m->from_fragment),
763 prefix, m->directory_mode);
764
765 if (m->control_pid > 0)
766 fprintf(f,
767 "%sControl PID: %lu\n",
768 prefix, (unsigned long) m->control_pid);
769
770 exec_context_dump(&m->exec_context, f, prefix);
771 }
772
773 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
774 pid_t pid;
775 int r;
776
777 assert(m);
778 assert(c);
779 assert(_pid);
780
781 if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
782 goto fail;
783
784 if ((r = exec_spawn(c,
785 NULL,
786 &m->exec_context,
787 NULL, 0,
788 m->meta.manager->environment,
789 true,
790 true,
791 true,
792 m->meta.manager->confirm_spawn,
793 m->meta.cgroup_bondings,
794 &pid)) < 0)
795 goto fail;
796
797 if ((r = unit_watch_pid(UNIT(m), pid)) < 0)
798 /* FIXME: we need to do something here */
799 goto fail;
800
801 *_pid = pid;
802
803 return 0;
804
805 fail:
806 unit_unwatch_timer(UNIT(m), &m->timer_watch);
807
808 return r;
809 }
810
811 static void mount_enter_dead(Mount *m, bool success) {
812 assert(m);
813
814 if (!success)
815 m->failure = true;
816
817 mount_set_state(m, m->failure ? MOUNT_FAILED : MOUNT_DEAD);
818 }
819
820 static void mount_enter_mounted(Mount *m, bool success) {
821 assert(m);
822
823 if (!success)
824 m->failure = true;
825
826 mount_set_state(m, MOUNT_MOUNTED);
827 }
828
829 static void mount_enter_signal(Mount *m, MountState state, bool success) {
830 int r;
831 Set *pid_set = NULL;
832 bool wait_for_exit = false;
833
834 assert(m);
835
836 if (!success)
837 m->failure = true;
838
839 if (m->exec_context.kill_mode != KILL_NONE) {
840 int sig = (state == MOUNT_MOUNTING_SIGTERM ||
841 state == MOUNT_UNMOUNTING_SIGTERM ||
842 state == MOUNT_REMOUNTING_SIGTERM) ? m->exec_context.kill_signal : SIGKILL;
843
844 if (m->control_pid > 0) {
845 if (kill_and_sigcont(m->control_pid, sig) < 0 && errno != ESRCH)
846
847 log_warning("Failed to kill control process %li: %m", (long) m->control_pid);
848 else
849 wait_for_exit = true;
850 }
851
852 if (m->exec_context.kill_mode == KILL_CONTROL_GROUP) {
853
854 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
855 r = -ENOMEM;
856 goto fail;
857 }
858
859 /* Exclude the control pid from being killed via the cgroup */
860 if (m->control_pid > 0)
861 if ((r = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0)
862 goto fail;
863
864 if ((r = cgroup_bonding_kill_list(m->meta.cgroup_bondings, sig, true, pid_set)) < 0) {
865 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
866 log_warning("Failed to kill control group: %s", strerror(-r));
867 } else if (r > 0)
868 wait_for_exit = true;
869
870 set_free(pid_set);
871 pid_set = NULL;
872 }
873 }
874
875 if (wait_for_exit) {
876 if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
877 goto fail;
878
879 mount_set_state(m, state);
880 } else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
881 mount_enter_mounted(m, true);
882 else
883 mount_enter_dead(m, true);
884
885 return;
886
887 fail:
888 log_warning("%s failed to kill processes: %s", m->meta.id, strerror(-r));
889
890 if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
891 mount_enter_mounted(m, false);
892 else
893 mount_enter_dead(m, false);
894
895 if (pid_set)
896 set_free(pid_set);
897 }
898
899 static void mount_enter_unmounting(Mount *m, bool success) {
900 int r;
901
902 assert(m);
903
904 if (!success)
905 m->failure = true;
906
907 m->control_command_id = MOUNT_EXEC_UNMOUNT;
908 m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
909
910 if ((r = exec_command_set(
911 m->control_command,
912 "/bin/umount",
913 m->where,
914 NULL)) < 0)
915 goto fail;
916
917 mount_unwatch_control_pid(m);
918
919 if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
920 goto fail;
921
922 mount_set_state(m, MOUNT_UNMOUNTING);
923
924 return;
925
926 fail:
927 log_warning("%s failed to run 'umount' task: %s", m->meta.id, strerror(-r));
928 mount_enter_mounted(m, false);
929 }
930
931 static void mount_enter_mounting(Mount *m) {
932 int r;
933 MountParameters *p;
934
935 assert(m);
936
937 m->control_command_id = MOUNT_EXEC_MOUNT;
938 m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
939
940 mkdir_p(m->where, m->directory_mode);
941
942 /* Create the source directory for bind-mounts if needed */
943 p = get_mount_parameters_configured(m);
944 if (p && mount_is_bind(p))
945 mkdir_p(p->what, m->directory_mode);
946
947 if (m->from_fragment)
948 r = exec_command_set(
949 m->control_command,
950 "/bin/mount",
951 m->parameters_fragment.what,
952 m->where,
953 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
954 m->parameters_fragment.options ? "-o" : NULL, m->parameters_fragment.options,
955 NULL);
956 else if (m->from_etc_fstab)
957 r = exec_command_set(
958 m->control_command,
959 "/bin/mount",
960 m->where,
961 NULL);
962 else
963 r = -ENOENT;
964
965 if (r < 0)
966 goto fail;
967
968 mount_unwatch_control_pid(m);
969
970 if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
971 goto fail;
972
973 mount_set_state(m, MOUNT_MOUNTING);
974
975 return;
976
977 fail:
978 log_warning("%s failed to run 'mount' task: %s", m->meta.id, strerror(-r));
979 mount_enter_dead(m, false);
980 }
981
982 static void mount_enter_mounting_done(Mount *m) {
983 assert(m);
984
985 mount_set_state(m, MOUNT_MOUNTING_DONE);
986 }
987
988 static void mount_enter_remounting(Mount *m, bool success) {
989 int r;
990
991 assert(m);
992
993 if (!success)
994 m->failure = true;
995
996 m->control_command_id = MOUNT_EXEC_REMOUNT;
997 m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
998
999 if (m->from_fragment) {
1000 char *buf = NULL;
1001 const char *o;
1002
1003 if (m->parameters_fragment.options) {
1004 if (!(buf = strappend("remount,", m->parameters_fragment.options))) {
1005 r = -ENOMEM;
1006 goto fail;
1007 }
1008
1009 o = buf;
1010 } else
1011 o = "remount";
1012
1013 r = exec_command_set(
1014 m->control_command,
1015 "/bin/mount",
1016 m->parameters_fragment.what,
1017 m->where,
1018 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
1019 "-o", o,
1020 NULL);
1021
1022 free(buf);
1023 } else if (m->from_etc_fstab)
1024 r = exec_command_set(
1025 m->control_command,
1026 "/bin/mount",
1027 m->where,
1028 "-o", "remount",
1029 NULL);
1030 else
1031 r = -ENOENT;
1032
1033 if (r < 0)
1034 goto fail;
1035
1036 mount_unwatch_control_pid(m);
1037
1038 if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
1039 goto fail;
1040
1041 mount_set_state(m, MOUNT_REMOUNTING);
1042
1043 return;
1044
1045 fail:
1046 log_warning("%s failed to run 'remount' task: %s", m->meta.id, strerror(-r));
1047 m->reload_failure = true;
1048 mount_enter_mounted(m, true);
1049 }
1050
1051 static int mount_start(Unit *u) {
1052 Mount *m = MOUNT(u);
1053
1054 assert(m);
1055
1056 /* We cannot fulfill this request right now, try again later
1057 * please! */
1058 if (m->state == MOUNT_UNMOUNTING ||
1059 m->state == MOUNT_UNMOUNTING_SIGTERM ||
1060 m->state == MOUNT_UNMOUNTING_SIGKILL ||
1061 m->state == MOUNT_MOUNTING_SIGTERM ||
1062 m->state == MOUNT_MOUNTING_SIGKILL)
1063 return -EAGAIN;
1064
1065 /* Already on it! */
1066 if (m->state == MOUNT_MOUNTING)
1067 return 0;
1068
1069 assert(m->state == MOUNT_DEAD || m->state == MOUNT_FAILED);
1070
1071 m->failure = false;
1072 mount_enter_mounting(m);
1073 return 0;
1074 }
1075
1076 static int mount_stop(Unit *u) {
1077 Mount *m = MOUNT(u);
1078
1079 assert(m);
1080
1081 /* Already on it */
1082 if (m->state == MOUNT_UNMOUNTING ||
1083 m->state == MOUNT_UNMOUNTING_SIGKILL ||
1084 m->state == MOUNT_UNMOUNTING_SIGTERM ||
1085 m->state == MOUNT_MOUNTING_SIGTERM ||
1086 m->state == MOUNT_MOUNTING_SIGKILL)
1087 return 0;
1088
1089 assert(m->state == MOUNT_MOUNTING ||
1090 m->state == MOUNT_MOUNTING_DONE ||
1091 m->state == MOUNT_MOUNTED ||
1092 m->state == MOUNT_REMOUNTING ||
1093 m->state == MOUNT_REMOUNTING_SIGTERM ||
1094 m->state == MOUNT_REMOUNTING_SIGKILL);
1095
1096 mount_enter_unmounting(m, true);
1097 return 0;
1098 }
1099
1100 static int mount_reload(Unit *u) {
1101 Mount *m = MOUNT(u);
1102
1103 assert(m);
1104
1105 if (m->state == MOUNT_MOUNTING_DONE)
1106 return -EAGAIN;
1107
1108 assert(m->state == MOUNT_MOUNTED);
1109
1110 mount_enter_remounting(m, true);
1111 return 0;
1112 }
1113
1114 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
1115 Mount *m = MOUNT(u);
1116
1117 assert(m);
1118 assert(f);
1119 assert(fds);
1120
1121 unit_serialize_item(u, f, "state", mount_state_to_string(m->state));
1122 unit_serialize_item(u, f, "failure", yes_no(m->failure));
1123
1124 if (m->control_pid > 0)
1125 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) m->control_pid);
1126
1127 if (m->control_command_id >= 0)
1128 unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id));
1129
1130 return 0;
1131 }
1132
1133 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1134 Mount *m = MOUNT(u);
1135
1136 assert(u);
1137 assert(key);
1138 assert(value);
1139 assert(fds);
1140
1141 if (streq(key, "state")) {
1142 MountState state;
1143
1144 if ((state = mount_state_from_string(value)) < 0)
1145 log_debug("Failed to parse state value %s", value);
1146 else
1147 m->deserialized_state = state;
1148 } else if (streq(key, "failure")) {
1149 int b;
1150
1151 if ((b = parse_boolean(value)) < 0)
1152 log_debug("Failed to parse failure value %s", value);
1153 else
1154 m->failure = b || m->failure;
1155
1156 } else if (streq(key, "control-pid")) {
1157 pid_t pid;
1158
1159 if (parse_pid(value, &pid) < 0)
1160 log_debug("Failed to parse control-pid value %s", value);
1161 else
1162 m->control_pid = pid;
1163 } else if (streq(key, "control-command")) {
1164 MountExecCommand id;
1165
1166 if ((id = mount_exec_command_from_string(value)) < 0)
1167 log_debug("Failed to parse exec-command value %s", value);
1168 else {
1169 m->control_command_id = id;
1170 m->control_command = m->exec_command + id;
1171 }
1172
1173 } else
1174 log_debug("Unknown serialization key '%s'", key);
1175
1176 return 0;
1177 }
1178
1179 static UnitActiveState mount_active_state(Unit *u) {
1180 assert(u);
1181
1182 return state_translation_table[MOUNT(u)->state];
1183 }
1184
1185 static const char *mount_sub_state_to_string(Unit *u) {
1186 assert(u);
1187
1188 return mount_state_to_string(MOUNT(u)->state);
1189 }
1190
1191 static bool mount_check_gc(Unit *u) {
1192 Mount *m = MOUNT(u);
1193
1194 assert(m);
1195
1196 return m->from_etc_fstab || m->from_proc_self_mountinfo;
1197 }
1198
1199 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1200 Mount *m = MOUNT(u);
1201 bool success;
1202
1203 assert(m);
1204 assert(pid >= 0);
1205
1206 if (pid != m->control_pid)
1207 return;
1208
1209 m->control_pid = 0;
1210
1211 success = is_clean_exit(code, status);
1212 m->failure = m->failure || !success;
1213
1214 if (m->control_command) {
1215 exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status);
1216 m->control_command = NULL;
1217 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1218 }
1219
1220 log_full(success ? LOG_DEBUG : LOG_NOTICE,
1221 "%s mount process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
1222
1223 /* Note that mount(8) returning and the kernel sending us a
1224 * mount table change event might happen out-of-order. If an
1225 * operation succeed we assume the kernel will follow soon too
1226 * and already change into the resulting state. If it fails
1227 * we check if the kernel still knows about the mount. and
1228 * change state accordingly. */
1229
1230 switch (m->state) {
1231
1232 case MOUNT_MOUNTING:
1233 case MOUNT_MOUNTING_DONE:
1234 case MOUNT_MOUNTING_SIGKILL:
1235 case MOUNT_MOUNTING_SIGTERM:
1236
1237 if (success)
1238 mount_enter_mounted(m, true);
1239 else if (m->from_proc_self_mountinfo)
1240 mount_enter_mounted(m, false);
1241 else
1242 mount_enter_dead(m, false);
1243 break;
1244
1245 case MOUNT_REMOUNTING:
1246 case MOUNT_REMOUNTING_SIGKILL:
1247 case MOUNT_REMOUNTING_SIGTERM:
1248
1249 m->reload_failure = !success;
1250 if (m->from_proc_self_mountinfo)
1251 mount_enter_mounted(m, true);
1252 else
1253 mount_enter_dead(m, true);
1254
1255 break;
1256
1257 case MOUNT_UNMOUNTING:
1258 case MOUNT_UNMOUNTING_SIGKILL:
1259 case MOUNT_UNMOUNTING_SIGTERM:
1260
1261 if (success)
1262 mount_enter_dead(m, true);
1263 else if (m->from_proc_self_mountinfo)
1264 mount_enter_mounted(m, false);
1265 else
1266 mount_enter_dead(m, false);
1267 break;
1268
1269 default:
1270 assert_not_reached("Uh, control process died at wrong time.");
1271 }
1272
1273 /* Notify clients about changed exit status */
1274 unit_add_to_dbus_queue(u);
1275 }
1276
1277 static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1278 Mount *m = MOUNT(u);
1279
1280 assert(m);
1281 assert(elapsed == 1);
1282 assert(w == &m->timer_watch);
1283
1284 switch (m->state) {
1285
1286 case MOUNT_MOUNTING:
1287 case MOUNT_MOUNTING_DONE:
1288 log_warning("%s mounting timed out. Stopping.", u->meta.id);
1289 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false);
1290 break;
1291
1292 case MOUNT_REMOUNTING:
1293 log_warning("%s remounting timed out. Stopping.", u->meta.id);
1294 m->reload_failure = true;
1295 mount_enter_mounted(m, true);
1296 break;
1297
1298 case MOUNT_UNMOUNTING:
1299 log_warning("%s unmounting timed out. Stopping.", u->meta.id);
1300 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false);
1301 break;
1302
1303 case MOUNT_MOUNTING_SIGTERM:
1304 if (m->exec_context.send_sigkill) {
1305 log_warning("%s mounting timed out. Killing.", u->meta.id);
1306 mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false);
1307 } else {
1308 log_warning("%s mounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1309
1310 if (m->from_proc_self_mountinfo)
1311 mount_enter_mounted(m, false);
1312 else
1313 mount_enter_dead(m, false);
1314 }
1315 break;
1316
1317 case MOUNT_REMOUNTING_SIGTERM:
1318 if (m->exec_context.send_sigkill) {
1319 log_warning("%s remounting timed out. Killing.", u->meta.id);
1320 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false);
1321 } else {
1322 log_warning("%s remounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1323
1324 if (m->from_proc_self_mountinfo)
1325 mount_enter_mounted(m, false);
1326 else
1327 mount_enter_dead(m, false);
1328 }
1329 break;
1330
1331 case MOUNT_UNMOUNTING_SIGTERM:
1332 if (m->exec_context.send_sigkill) {
1333 log_warning("%s unmounting timed out. Killing.", u->meta.id);
1334 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false);
1335 } else {
1336 log_warning("%s unmounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1337
1338 if (m->from_proc_self_mountinfo)
1339 mount_enter_mounted(m, false);
1340 else
1341 mount_enter_dead(m, false);
1342 }
1343 break;
1344
1345 case MOUNT_MOUNTING_SIGKILL:
1346 case MOUNT_REMOUNTING_SIGKILL:
1347 case MOUNT_UNMOUNTING_SIGKILL:
1348 log_warning("%s mount process still around after SIGKILL. Ignoring.", u->meta.id);
1349
1350 if (m->from_proc_self_mountinfo)
1351 mount_enter_mounted(m, false);
1352 else
1353 mount_enter_dead(m, false);
1354 break;
1355
1356 default:
1357 assert_not_reached("Timeout at wrong time.");
1358 }
1359 }
1360
1361 static int mount_add_one(
1362 Manager *m,
1363 const char *what,
1364 const char *where,
1365 const char *options,
1366 const char *fstype,
1367 int passno,
1368 bool from_proc_self_mountinfo,
1369 bool set_flags) {
1370 int r;
1371 Unit *u;
1372 bool delete;
1373 char *e, *w = NULL, *o = NULL, *f = NULL;
1374 MountParameters *p;
1375
1376 assert(m);
1377 assert(what);
1378 assert(where);
1379 assert(options);
1380 assert(fstype);
1381
1382 assert(!set_flags || from_proc_self_mountinfo);
1383
1384 /* Ignore API mount points. They should never be referenced in
1385 * dependencies ever. */
1386 if (mount_point_is_api(where) || mount_point_ignore(where))
1387 return 0;
1388
1389 if (streq(fstype, "autofs"))
1390 return 0;
1391
1392 /* probably some kind of swap, ignore */
1393 if (!is_path(where))
1394 return 0;
1395
1396 if (!(e = unit_name_from_path(where, ".mount")))
1397 return -ENOMEM;
1398
1399 if (!(u = manager_get_unit(m, e))) {
1400 delete = true;
1401
1402 if (!(u = unit_new(m))) {
1403 free(e);
1404 return -ENOMEM;
1405 }
1406
1407 r = unit_add_name(u, e);
1408 free(e);
1409
1410 if (r < 0)
1411 goto fail;
1412
1413 if (!(MOUNT(u)->where = strdup(where))) {
1414 r = -ENOMEM;
1415 goto fail;
1416 }
1417
1418 unit_add_to_load_queue(u);
1419 } else {
1420 delete = false;
1421 free(e);
1422 }
1423
1424 if (!(w = strdup(what)) ||
1425 !(o = strdup(options)) ||
1426 !(f = strdup(fstype))) {
1427 r = -ENOMEM;
1428 goto fail;
1429 }
1430
1431 if (from_proc_self_mountinfo) {
1432 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1433
1434 if (set_flags) {
1435 MOUNT(u)->is_mounted = true;
1436 MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
1437 MOUNT(u)->just_changed = !streq_ptr(p->options, o);
1438 }
1439
1440 MOUNT(u)->from_proc_self_mountinfo = true;
1441 } else {
1442 p = &MOUNT(u)->parameters_etc_fstab;
1443 MOUNT(u)->from_etc_fstab = true;
1444 }
1445
1446 free(p->what);
1447 p->what = w;
1448
1449 free(p->options);
1450 p->options = o;
1451
1452 free(p->fstype);
1453 p->fstype = f;
1454
1455 p->passno = passno;
1456
1457 unit_add_to_dbus_queue(u);
1458
1459 return 0;
1460
1461 fail:
1462 free(w);
1463 free(o);
1464 free(f);
1465
1466 if (delete && u)
1467 unit_free(u);
1468
1469 return r;
1470 }
1471
1472 static int mount_find_pri(char *options) {
1473 char *end, *pri;
1474 unsigned long r;
1475
1476 if (!(pri = mount_test_option(options, "pri=")))
1477 return 0;
1478
1479 pri += 4;
1480
1481 errno = 0;
1482 r = strtoul(pri, &end, 10);
1483
1484 if (errno != 0)
1485 return -errno;
1486
1487 if (end == pri || (*end != ',' && *end != 0))
1488 return -EINVAL;
1489
1490 return (int) r;
1491 }
1492
1493 static int mount_load_etc_fstab(Manager *m) {
1494 FILE *f;
1495 int r = 0;
1496 struct mntent* me;
1497
1498 assert(m);
1499
1500 errno = 0;
1501 if (!(f = setmntent("/etc/fstab", "r")))
1502 return -errno;
1503
1504 while ((me = getmntent(f))) {
1505 char *where, *what;
1506 int k;
1507
1508 if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
1509 r = -ENOMEM;
1510 goto finish;
1511 }
1512
1513 if (!(where = strdup(me->mnt_dir))) {
1514 free(what);
1515 r = -ENOMEM;
1516 goto finish;
1517 }
1518
1519 if (what[0] == '/')
1520 path_kill_slashes(what);
1521
1522 if (where[0] == '/')
1523 path_kill_slashes(where);
1524
1525 if (streq(me->mnt_type, "swap")) {
1526 int pri;
1527
1528 if ((pri = mount_find_pri(me->mnt_opts)) < 0)
1529 k = pri;
1530 else
1531 k = swap_add_one(m,
1532 what,
1533 NULL,
1534 pri,
1535 !!mount_test_option(me->mnt_opts, "noauto"),
1536 !!mount_test_option(me->mnt_opts, "nofail"),
1537 !!mount_test_option(me->mnt_opts, "comment=systemd.swapon"),
1538 false);
1539 } else
1540 k = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, me->mnt_passno, false, false);
1541
1542 free(what);
1543 free(where);
1544
1545 if (r < 0)
1546 r = k;
1547 }
1548
1549 finish:
1550
1551 endmntent(f);
1552 return r;
1553 }
1554
1555 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1556 int r = 0;
1557 unsigned i;
1558 char *device, *path, *options, *options2, *fstype, *d, *p, *o;
1559
1560 assert(m);
1561
1562 rewind(m->proc_self_mountinfo);
1563
1564 for (i = 1;; i++) {
1565 int k;
1566
1567 device = path = options = options2 = fstype = d = p = o = NULL;
1568
1569 if ((k = fscanf(m->proc_self_mountinfo,
1570 "%*s " /* (1) mount id */
1571 "%*s " /* (2) parent id */
1572 "%*s " /* (3) major:minor */
1573 "%*s " /* (4) root */
1574 "%ms " /* (5) mount point */
1575 "%ms" /* (6) mount options */
1576 "%*[^-]" /* (7) optional fields */
1577 "- " /* (8) separator */
1578 "%ms " /* (9) file system type */
1579 "%ms" /* (10) mount source */
1580 "%ms" /* (11) mount options 2 */
1581 "%*[^\n]", /* some rubbish at the end */
1582 &path,
1583 &options,
1584 &fstype,
1585 &device,
1586 &options2)) != 5) {
1587
1588 if (k == EOF)
1589 break;
1590
1591 log_warning("Failed to parse /proc/self/mountinfo:%u.", i);
1592 goto clean_up;
1593 }
1594
1595 if (asprintf(&o, "%s,%s", options, options2) < 0) {
1596 r = -ENOMEM;
1597 goto finish;
1598 }
1599
1600 if (!(d = cunescape(device)) ||
1601 !(p = cunescape(path))) {
1602 r = -ENOMEM;
1603 goto finish;
1604 }
1605
1606 if ((k = mount_add_one(m, d, p, o, fstype, 0, true, set_flags)) < 0)
1607 r = k;
1608
1609 clean_up:
1610 free(device);
1611 free(path);
1612 free(options);
1613 free(options2);
1614 free(fstype);
1615 free(d);
1616 free(p);
1617 free(o);
1618 }
1619
1620 finish:
1621 free(device);
1622 free(path);
1623 free(options);
1624 free(options2);
1625 free(fstype);
1626 free(d);
1627 free(p);
1628 free(o);
1629
1630 return r;
1631 }
1632
1633 static void mount_shutdown(Manager *m) {
1634 assert(m);
1635
1636 if (m->proc_self_mountinfo) {
1637 fclose(m->proc_self_mountinfo);
1638 m->proc_self_mountinfo = NULL;
1639 }
1640 }
1641
1642 static int mount_enumerate(Manager *m) {
1643 int r;
1644 struct epoll_event ev;
1645 assert(m);
1646
1647 if (!m->proc_self_mountinfo) {
1648 if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "re")))
1649 return -errno;
1650
1651 m->mount_watch.type = WATCH_MOUNT;
1652 m->mount_watch.fd = fileno(m->proc_self_mountinfo);
1653
1654 zero(ev);
1655 ev.events = EPOLLPRI;
1656 ev.data.ptr = &m->mount_watch;
1657
1658 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
1659 return -errno;
1660 }
1661
1662 if ((r = mount_load_etc_fstab(m)) < 0)
1663 goto fail;
1664
1665 if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
1666 goto fail;
1667
1668 return 0;
1669
1670 fail:
1671 mount_shutdown(m);
1672 return r;
1673 }
1674
1675 void mount_fd_event(Manager *m, int events) {
1676 Meta *meta;
1677 int r;
1678
1679 assert(m);
1680 assert(events & EPOLLPRI);
1681
1682 /* The manager calls this for every fd event happening on the
1683 * /proc/self/mountinfo file, which informs us about mounting
1684 * table changes */
1685
1686 if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
1687 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-r));
1688
1689 /* Reset flags, just in case, for later calls */
1690 LIST_FOREACH(units_by_type, meta, m->units_by_type[UNIT_MOUNT]) {
1691 Mount *mount = (Mount*) meta;
1692
1693 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1694 }
1695
1696 return;
1697 }
1698
1699 manager_dispatch_load_queue(m);
1700
1701 LIST_FOREACH(units_by_type, meta, m->units_by_type[UNIT_MOUNT]) {
1702 Mount *mount = (Mount*) meta;
1703
1704 if (!mount->is_mounted) {
1705 /* This has just been unmounted. */
1706
1707 mount->from_proc_self_mountinfo = false;
1708
1709 switch (mount->state) {
1710
1711 case MOUNT_MOUNTED:
1712 mount_enter_dead(mount, true);
1713 break;
1714
1715 default:
1716 mount_set_state(mount, mount->state);
1717 break;
1718
1719 }
1720
1721 } else if (mount->just_mounted || mount->just_changed) {
1722
1723 /* New or changed mount entry */
1724
1725 switch (mount->state) {
1726
1727 case MOUNT_DEAD:
1728 case MOUNT_FAILED:
1729 mount_enter_mounted(mount, true);
1730 break;
1731
1732 case MOUNT_MOUNTING:
1733 mount_enter_mounting_done(mount);
1734 break;
1735
1736 default:
1737 /* Nothing really changed, but let's
1738 * issue an notification call
1739 * nonetheless, in case somebody is
1740 * waiting for this. (e.g. file system
1741 * ro/rw remounts.) */
1742 mount_set_state(mount, mount->state);
1743 break;
1744 }
1745 }
1746
1747 /* Reset the flags for later calls */
1748 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1749 }
1750 }
1751
1752 static void mount_reset_failed(Unit *u) {
1753 Mount *m = MOUNT(u);
1754
1755 assert(m);
1756
1757 if (m->state == MOUNT_FAILED)
1758 mount_set_state(m, MOUNT_DEAD);
1759
1760 m->failure = false;
1761 }
1762
1763 static int mount_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
1764 Mount *m = MOUNT(u);
1765 int r = 0;
1766 Set *pid_set = NULL;
1767
1768 assert(m);
1769
1770 if (who == KILL_MAIN) {
1771 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Mount units have no main processes");
1772 return -ESRCH;
1773 }
1774
1775 if (m->control_pid <= 0 && who == KILL_CONTROL) {
1776 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
1777 return -ESRCH;
1778 }
1779
1780 if (who == KILL_CONTROL || who == KILL_ALL)
1781 if (m->control_pid > 0)
1782 if (kill(m->control_pid, signo) < 0)
1783 r = -errno;
1784
1785 if (who == KILL_ALL && mode == KILL_CONTROL_GROUP) {
1786 int q;
1787
1788 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
1789 return -ENOMEM;
1790
1791 /* Exclude the control pid from being killed via the cgroup */
1792 if (m->control_pid > 0)
1793 if ((q = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0) {
1794 r = q;
1795 goto finish;
1796 }
1797
1798 if ((q = cgroup_bonding_kill_list(m->meta.cgroup_bondings, signo, false, pid_set)) < 0)
1799 if (q != -EAGAIN && q != -ESRCH && q != -ENOENT)
1800 r = q;
1801 }
1802
1803 finish:
1804 if (pid_set)
1805 set_free(pid_set);
1806
1807 return r;
1808 }
1809
1810 static const char* const mount_state_table[_MOUNT_STATE_MAX] = {
1811 [MOUNT_DEAD] = "dead",
1812 [MOUNT_MOUNTING] = "mounting",
1813 [MOUNT_MOUNTING_DONE] = "mounting-done",
1814 [MOUNT_MOUNTED] = "mounted",
1815 [MOUNT_REMOUNTING] = "remounting",
1816 [MOUNT_UNMOUNTING] = "unmounting",
1817 [MOUNT_MOUNTING_SIGTERM] = "mounting-sigterm",
1818 [MOUNT_MOUNTING_SIGKILL] = "mounting-sigkill",
1819 [MOUNT_REMOUNTING_SIGTERM] = "remounting-sigterm",
1820 [MOUNT_REMOUNTING_SIGKILL] = "remounting-sigkill",
1821 [MOUNT_UNMOUNTING_SIGTERM] = "unmounting-sigterm",
1822 [MOUNT_UNMOUNTING_SIGKILL] = "unmounting-sigkill",
1823 [MOUNT_FAILED] = "failed"
1824 };
1825
1826 DEFINE_STRING_TABLE_LOOKUP(mount_state, MountState);
1827
1828 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1829 [MOUNT_EXEC_MOUNT] = "ExecMount",
1830 [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1831 [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1832 };
1833
1834 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1835
1836 const UnitVTable mount_vtable = {
1837 .suffix = ".mount",
1838 .sections =
1839 "Unit\0"
1840 "Mount\0"
1841 "Install\0",
1842
1843 .no_alias = true,
1844 .no_instances = true,
1845 .show_status = true,
1846
1847 .init = mount_init,
1848 .load = mount_load,
1849 .done = mount_done,
1850
1851 .coldplug = mount_coldplug,
1852
1853 .dump = mount_dump,
1854
1855 .start = mount_start,
1856 .stop = mount_stop,
1857 .reload = mount_reload,
1858
1859 .kill = mount_kill,
1860
1861 .serialize = mount_serialize,
1862 .deserialize_item = mount_deserialize_item,
1863
1864 .active_state = mount_active_state,
1865 .sub_state_to_string = mount_sub_state_to_string,
1866
1867 .check_gc = mount_check_gc,
1868
1869 .sigchld_event = mount_sigchld_event,
1870 .timer_event = mount_timer_event,
1871
1872 .reset_failed = mount_reset_failed,
1873
1874 .bus_interface = "org.freedesktop.systemd1.Mount",
1875 .bus_message_handler = bus_mount_message_handler,
1876 .bus_invalidating_properties = bus_mount_invalidating_properties,
1877
1878 .enumerate = mount_enumerate,
1879 .shutdown = mount_shutdown
1880 };
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