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