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[thirdparty/systemd.git] / src / core / mount.c
1 /***
2 This file is part of systemd.
3
4 Copyright 2010 Lennart Poettering
5
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
10
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
18 ***/
19
20 #include <errno.h>
21 #include <signal.h>
22 #include <stdio.h>
23 #include <sys/epoll.h>
24
25 #include "sd-messages.h"
26
27 #include "alloc-util.h"
28 #include "dbus-mount.h"
29 #include "escape.h"
30 #include "exit-status.h"
31 #include "format-util.h"
32 #include "fstab-util.h"
33 #include "log.h"
34 #include "manager.h"
35 #include "mkdir.h"
36 #include "mount-setup.h"
37 #include "mount-util.h"
38 #include "mount.h"
39 #include "parse-util.h"
40 #include "path-util.h"
41 #include "process-util.h"
42 #include "special.h"
43 #include "string-table.h"
44 #include "string-util.h"
45 #include "strv.h"
46 #include "unit-name.h"
47 #include "unit.h"
48
49 #define RETRY_UMOUNT_MAX 32
50
51 DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_table*, mnt_free_table);
52 DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_iter*, mnt_free_iter);
53
54 static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
55 [MOUNT_DEAD] = UNIT_INACTIVE,
56 [MOUNT_MOUNTING] = UNIT_ACTIVATING,
57 [MOUNT_MOUNTING_DONE] = UNIT_ACTIVE,
58 [MOUNT_MOUNTED] = UNIT_ACTIVE,
59 [MOUNT_REMOUNTING] = UNIT_RELOADING,
60 [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
61 [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING,
62 [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING,
63 [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
64 [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
65 [MOUNT_FAILED] = UNIT_FAILED
66 };
67
68 static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
69 static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
70
71 static bool MOUNT_STATE_WITH_PROCESS(MountState state) {
72 return IN_SET(state,
73 MOUNT_MOUNTING,
74 MOUNT_MOUNTING_DONE,
75 MOUNT_REMOUNTING,
76 MOUNT_REMOUNTING_SIGTERM,
77 MOUNT_REMOUNTING_SIGKILL,
78 MOUNT_UNMOUNTING,
79 MOUNT_UNMOUNTING_SIGTERM,
80 MOUNT_UNMOUNTING_SIGKILL);
81 }
82
83 static bool mount_needs_network(const char *options, const char *fstype) {
84 if (fstab_test_option(options, "_netdev\0"))
85 return true;
86
87 if (fstype && fstype_is_network(fstype))
88 return true;
89
90 return false;
91 }
92
93 static bool mount_is_network(const MountParameters *p) {
94 assert(p);
95
96 return mount_needs_network(p->options, p->fstype);
97 }
98
99 static bool mount_is_loop(const MountParameters *p) {
100 assert(p);
101
102 if (fstab_test_option(p->options, "loop\0"))
103 return true;
104
105 return false;
106 }
107
108 static bool mount_is_bind(const MountParameters *p) {
109 assert(p);
110
111 if (fstab_test_option(p->options, "bind\0" "rbind\0"))
112 return true;
113
114 if (p->fstype && STR_IN_SET(p->fstype, "bind", "rbind"))
115 return true;
116
117 return false;
118 }
119
120 static bool mount_is_auto(const MountParameters *p) {
121 assert(p);
122
123 return !fstab_test_option(p->options, "noauto\0");
124 }
125
126 static bool mount_is_automount(const MountParameters *p) {
127 assert(p);
128
129 return fstab_test_option(p->options,
130 "comment=systemd.automount\0"
131 "x-systemd.automount\0");
132 }
133
134 static bool mount_is_bound_to_device(const Mount *m) {
135 const MountParameters *p;
136
137 if (m->from_fragment)
138 return true;
139
140 p = &m->parameters_proc_self_mountinfo;
141 return fstab_test_option(p->options, "x-systemd.device-bound\0");
142 }
143
144 static bool needs_quota(const MountParameters *p) {
145 assert(p);
146
147 /* Quotas are not enabled on network filesystems,
148 * but we want them, for example, on storage connected via iscsi */
149 if (p->fstype && fstype_is_network(p->fstype))
150 return false;
151
152 if (mount_is_bind(p))
153 return false;
154
155 return fstab_test_option(p->options,
156 "usrquota\0" "grpquota\0" "quota\0" "usrjquota\0" "grpjquota\0");
157 }
158
159 const char *mount_get_fstype(const Mount *m) {
160 const char *type = NULL;
161
162 assert(m);
163
164 if (m->from_proc_self_mountinfo && m->parameters_proc_self_mountinfo.fstype)
165 type = m->parameters_proc_self_mountinfo.fstype;
166 else if (m->from_fragment && m->parameters_fragment.fstype)
167 type = m->parameters_fragment.fstype;
168 else
169 type = "";
170
171 return type;
172 }
173
174 static void mount_init(Unit *u) {
175 Mount *m = MOUNT(u);
176
177 assert(u);
178 assert(u->load_state == UNIT_STUB);
179
180 m->timeout_usec = u->manager->default_timeout_start_usec;
181 m->directory_mode = 0755;
182
183 /* We need to make sure that /usr/bin/mount is always called
184 * in the same process group as us, so that the autofs kernel
185 * side doesn't send us another mount request while we are
186 * already trying to comply its last one. */
187 m->exec_context.same_pgrp = true;
188
189 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
190
191 u->ignore_on_isolate = true;
192 }
193
194 static int mount_arm_timer(Mount *m, usec_t usec) {
195 int r;
196
197 assert(m);
198
199 if (m->timer_event_source) {
200 r = sd_event_source_set_time(m->timer_event_source, usec);
201 if (r < 0)
202 return r;
203
204 return sd_event_source_set_enabled(m->timer_event_source, SD_EVENT_ONESHOT);
205 }
206
207 if (usec == USEC_INFINITY)
208 return 0;
209
210 r = sd_event_add_time(
211 UNIT(m)->manager->event,
212 &m->timer_event_source,
213 CLOCK_MONOTONIC,
214 usec, 0,
215 mount_dispatch_timer, m);
216 if (r < 0)
217 return r;
218
219 (void) sd_event_source_set_description(m->timer_event_source, "mount-timer");
220
221 return 0;
222 }
223
224 static void mount_unwatch_control_pid(Mount *m) {
225 assert(m);
226
227 if (m->control_pid <= 0)
228 return;
229
230 unit_unwatch_pid(UNIT(m), m->control_pid);
231 m->control_pid = 0;
232 }
233
234 static void mount_parameters_done(MountParameters *p) {
235 assert(p);
236
237 free(p->what);
238 free(p->options);
239 free(p->fstype);
240
241 p->what = p->options = p->fstype = NULL;
242 }
243
244 static void mount_done(Unit *u) {
245 Mount *m = MOUNT(u);
246
247 assert(m);
248
249 m->where = mfree(m->where);
250
251 mount_parameters_done(&m->parameters_proc_self_mountinfo);
252 mount_parameters_done(&m->parameters_fragment);
253
254 m->exec_runtime = exec_runtime_unref(m->exec_runtime);
255 exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
256 m->control_command = NULL;
257
258 dynamic_creds_unref(&m->dynamic_creds);
259
260 mount_unwatch_control_pid(m);
261
262 m->timer_event_source = sd_event_source_unref(m->timer_event_source);
263 }
264
265 _pure_ static MountParameters* get_mount_parameters_fragment(Mount *m) {
266 assert(m);
267
268 if (m->from_fragment)
269 return &m->parameters_fragment;
270
271 return NULL;
272 }
273
274 _pure_ static MountParameters* get_mount_parameters(Mount *m) {
275 assert(m);
276
277 if (m->from_proc_self_mountinfo)
278 return &m->parameters_proc_self_mountinfo;
279
280 return get_mount_parameters_fragment(m);
281 }
282
283 static int mount_add_mount_dependencies(Mount *m) {
284 const char *fstype;
285 MountParameters *pm;
286 Unit *other;
287 Iterator i;
288 Set *s;
289 int r;
290
291 assert(m);
292
293 if (!path_equal(m->where, "/")) {
294 _cleanup_free_ char *parent = NULL;
295
296 /* Adds in links to other mount points that might lie further up in the hierarchy */
297
298 parent = dirname_malloc(m->where);
299 if (!parent)
300 return -ENOMEM;
301
302 r = unit_require_mounts_for(UNIT(m), parent, UNIT_DEPENDENCY_IMPLICIT);
303 if (r < 0)
304 return r;
305 }
306
307 /* Adds in dependencies to other mount points that might be needed for the source path (if this is a bind mount
308 * or a loop mount) to be available. */
309 pm = get_mount_parameters_fragment(m);
310 if (pm && pm->what &&
311 path_is_absolute(pm->what) &&
312 (mount_is_bind(pm) || mount_is_loop(pm) || !mount_is_network(pm))) {
313
314 r = unit_require_mounts_for(UNIT(m), pm->what, UNIT_DEPENDENCY_FILE);
315 if (r < 0)
316 return r;
317 }
318
319 /* Adds in dependencies to other units that use this path or paths further down in the hierarchy */
320 s = manager_get_units_requiring_mounts_for(UNIT(m)->manager, m->where);
321 SET_FOREACH(other, s, i) {
322
323 if (other->load_state != UNIT_LOADED)
324 continue;
325
326 if (other == UNIT(m))
327 continue;
328
329 r = unit_add_dependency(other, UNIT_AFTER, UNIT(m), true, UNIT_DEPENDENCY_PATH);
330 if (r < 0)
331 return r;
332
333 if (UNIT(m)->fragment_path) {
334 /* If we have fragment configuration, then make this dependency required */
335 r = unit_add_dependency(other, UNIT_REQUIRES, UNIT(m), true, UNIT_DEPENDENCY_PATH);
336 if (r < 0)
337 return r;
338 }
339 }
340
341 /* If this is a tmpfs mount then we have to unmount it before we try to deactivate swaps */
342 fstype = mount_get_fstype(m);
343 if (streq(fstype, "tmpfs")) {
344 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_SWAP_TARGET, NULL, true, UNIT_DEPENDENCY_IMPLICIT);
345 if (r < 0)
346 return r;
347 }
348
349 return 0;
350 }
351
352 static int mount_add_device_dependencies(Mount *m) {
353 bool device_wants_mount = false;
354 UnitDependencyMask mask;
355 MountParameters *p;
356 UnitDependency dep;
357 int r;
358
359 assert(m);
360
361 p = get_mount_parameters(m);
362 if (!p)
363 return 0;
364
365 if (!p->what)
366 return 0;
367
368 if (mount_is_bind(p))
369 return 0;
370
371 if (!is_device_path(p->what))
372 return 0;
373
374 /* /dev/root is a really weird thing, it's not a real device,
375 * but just a path the kernel exports for the root file system
376 * specified on the kernel command line. Ignore it here. */
377 if (path_equal(p->what, "/dev/root"))
378 return 0;
379
380 if (path_equal(m->where, "/"))
381 return 0;
382
383 if (mount_is_auto(p) && !mount_is_automount(p) && MANAGER_IS_SYSTEM(UNIT(m)->manager))
384 device_wants_mount = true;
385
386 /* Mount units from /proc/self/mountinfo are not bound to devices
387 * by default since they're subject to races when devices are
388 * unplugged. But the user can still force this dep with an
389 * appropriate option (or udev property) so the mount units are
390 * automatically stopped when the device disappears suddenly. */
391 dep = mount_is_bound_to_device(m) ? UNIT_BINDS_TO : UNIT_REQUIRES;
392
393 mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT;
394
395 r = unit_add_node_dependency(UNIT(m), p->what, device_wants_mount, dep, mask);
396 if (r < 0)
397 return r;
398
399 return 0;
400 }
401
402 static int mount_add_quota_dependencies(Mount *m) {
403 UnitDependencyMask mask;
404 MountParameters *p;
405 int r;
406
407 assert(m);
408
409 if (!MANAGER_IS_SYSTEM(UNIT(m)->manager))
410 return 0;
411
412 p = get_mount_parameters_fragment(m);
413 if (!p)
414 return 0;
415
416 if (!needs_quota(p))
417 return 0;
418
419 mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT;
420
421 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, NULL, true, mask);
422 if (r < 0)
423 return r;
424
425 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, NULL, true, mask);
426 if (r < 0)
427 return r;
428
429 return 0;
430 }
431
432 static bool mount_is_extrinsic(Mount *m) {
433 MountParameters *p;
434 assert(m);
435
436 /* Returns true for all units that are "magic" and should be excluded from the usual start-up and shutdown
437 * dependencies. We call them "extrinsic" here, as they are generally mounted outside of the systemd dependency
438 * logic. We shouldn't attempt to manage them ourselves but it's fine if the user operates on them with us. */
439
440 if (!MANAGER_IS_SYSTEM(UNIT(m)->manager)) /* We only automatically manage mounts if we are in system mode */
441 return true;
442
443 if (PATH_IN_SET(m->where, /* Don't bother with the OS data itself */
444 "/",
445 "/usr"))
446 return true;
447
448 if (PATH_STARTSWITH_SET(m->where,
449 "/run/initramfs", /* This should stay around from before we boot until after we shutdown */
450 "/proc", /* All of this is API VFS */
451 "/sys", /* … dito … */
452 "/dev")) /* … dito … */
453 return true;
454
455 /* If this is an initrd mount, and we are not in the initrd, then leave this around forever, too. */
456 p = get_mount_parameters(m);
457 if (p && fstab_test_option(p->options, "x-initrd.mount\0") && !in_initrd())
458 return true;
459
460 return false;
461 }
462
463 static int mount_add_default_dependencies(Mount *m) {
464 UnitDependencyMask mask;
465 int r;
466 MountParameters *p;
467 const char *after;
468
469 assert(m);
470
471 if (!UNIT(m)->default_dependencies)
472 return 0;
473
474 /* We do not add any default dependencies to /, /usr or /run/initramfs/, since they are guaranteed to stay
475 * mounted the whole time, since our system is on it. Also, don't bother with anything mounted below virtual
476 * file systems, it's also going to be virtual, and hence not worth the effort. */
477 if (mount_is_extrinsic(m))
478 return 0;
479
480 p = get_mount_parameters(m);
481 if (!p)
482 return 0;
483
484 mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_DEFAULT;
485
486 if (mount_is_network(p)) {
487 /* We order ourselves after network.target. This is
488 * primarily useful at shutdown: services that take
489 * down the network should order themselves before
490 * network.target, so that they are shut down only
491 * after this mount unit is stopped. */
492
493 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_NETWORK_TARGET, NULL, true, mask);
494 if (r < 0)
495 return r;
496
497 /* We pull in network-online.target, and order
498 * ourselves after it. This is useful at start-up to
499 * actively pull in tools that want to be started
500 * before we start mounting network file systems, and
501 * whose purpose it is to delay this until the network
502 * is "up". */
503
504 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_WANTS, UNIT_AFTER, SPECIAL_NETWORK_ONLINE_TARGET, NULL, true, mask);
505 if (r < 0)
506 return r;
507
508 after = SPECIAL_REMOTE_FS_PRE_TARGET;
509 } else
510 after = SPECIAL_LOCAL_FS_PRE_TARGET;
511
512 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, NULL, true, mask);
513 if (r < 0)
514 return r;
515
516 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true, mask);
517 if (r < 0)
518 return r;
519
520 return 0;
521 }
522
523 static int mount_verify(Mount *m) {
524 _cleanup_free_ char *e = NULL;
525 MountParameters *p;
526 int r;
527
528 assert(m);
529
530 if (UNIT(m)->load_state != UNIT_LOADED)
531 return 0;
532
533 if (!m->from_fragment && !m->from_proc_self_mountinfo && !UNIT(m)->perpetual)
534 return -ENOENT;
535
536 r = unit_name_from_path(m->where, ".mount", &e);
537 if (r < 0)
538 return log_unit_error_errno(UNIT(m), r, "Failed to generate unit name from mount path: %m");
539
540 if (!unit_has_name(UNIT(m), e)) {
541 log_unit_error(UNIT(m), "Where= setting doesn't match unit name. Refusing.");
542 return -EINVAL;
543 }
544
545 if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
546 log_unit_error(UNIT(m), "Cannot create mount unit for API file system %s. Refusing.", m->where);
547 return -EINVAL;
548 }
549
550 p = get_mount_parameters_fragment(m);
551 if (p && !p->what) {
552 log_unit_error(UNIT(m), "What= setting is missing. Refusing.");
553 return -EBADMSG;
554 }
555
556 if (m->exec_context.pam_name && m->kill_context.kill_mode != KILL_CONTROL_GROUP) {
557 log_unit_error(UNIT(m), "Unit has PAM enabled. Kill mode must be set to control-group'. Refusing.");
558 return -EINVAL;
559 }
560
561 return 0;
562 }
563
564 static int mount_add_extras(Mount *m) {
565 Unit *u = UNIT(m);
566 int r;
567
568 assert(m);
569
570 if (u->fragment_path)
571 m->from_fragment = true;
572
573 if (!m->where) {
574 r = unit_name_to_path(u->id, &m->where);
575 if (r < 0)
576 return r;
577 }
578
579 path_kill_slashes(m->where);
580
581 if (!u->description) {
582 r = unit_set_description(u, m->where);
583 if (r < 0)
584 return r;
585 }
586
587 r = mount_add_device_dependencies(m);
588 if (r < 0)
589 return r;
590
591 r = mount_add_mount_dependencies(m);
592 if (r < 0)
593 return r;
594
595 r = mount_add_quota_dependencies(m);
596 if (r < 0)
597 return r;
598
599 r = unit_patch_contexts(u);
600 if (r < 0)
601 return r;
602
603 r = unit_add_exec_dependencies(u, &m->exec_context);
604 if (r < 0)
605 return r;
606
607 r = unit_set_default_slice(u);
608 if (r < 0)
609 return r;
610
611 r = mount_add_default_dependencies(m);
612 if (r < 0)
613 return r;
614
615 return 0;
616 }
617
618 static int mount_load_root_mount(Unit *u) {
619 assert(u);
620
621 if (!unit_has_name(u, SPECIAL_ROOT_MOUNT))
622 return 0;
623
624 u->perpetual = true;
625 u->default_dependencies = false;
626
627 /* The stdio/kmsg bridge socket is on /, in order to avoid a dep loop, don't use kmsg logging for -.mount */
628 MOUNT(u)->exec_context.std_output = EXEC_OUTPUT_NULL;
629 MOUNT(u)->exec_context.std_input = EXEC_INPUT_NULL;
630
631 if (!u->description)
632 u->description = strdup("Root Mount");
633
634 return 1;
635 }
636
637 static int mount_load(Unit *u) {
638 Mount *m = MOUNT(u);
639 int r;
640
641 assert(u);
642 assert(u->load_state == UNIT_STUB);
643
644 r = mount_load_root_mount(u);
645 if (r < 0)
646 return r;
647
648 if (m->from_proc_self_mountinfo || u->perpetual)
649 r = unit_load_fragment_and_dropin_optional(u);
650 else
651 r = unit_load_fragment_and_dropin(u);
652 if (r < 0)
653 return r;
654
655 /* This is a new unit? Then let's add in some extras */
656 if (u->load_state == UNIT_LOADED) {
657 r = mount_add_extras(m);
658 if (r < 0)
659 return r;
660 }
661
662 return mount_verify(m);
663 }
664
665 static void mount_set_state(Mount *m, MountState state) {
666 MountState old_state;
667 assert(m);
668
669 old_state = m->state;
670 m->state = state;
671
672 if (!MOUNT_STATE_WITH_PROCESS(state)) {
673 m->timer_event_source = sd_event_source_unref(m->timer_event_source);
674 mount_unwatch_control_pid(m);
675 m->control_command = NULL;
676 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
677 }
678
679 if (state != old_state)
680 log_unit_debug(UNIT(m), "Changed %s -> %s", mount_state_to_string(old_state), mount_state_to_string(state));
681
682 unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state], m->reload_result == MOUNT_SUCCESS);
683 }
684
685 static int mount_coldplug(Unit *u) {
686 Mount *m = MOUNT(u);
687 MountState new_state = MOUNT_DEAD;
688 int r;
689
690 assert(m);
691 assert(m->state == MOUNT_DEAD);
692
693 if (m->deserialized_state != m->state)
694 new_state = m->deserialized_state;
695 else if (m->from_proc_self_mountinfo)
696 new_state = MOUNT_MOUNTED;
697
698 if (new_state == m->state)
699 return 0;
700
701 if (m->control_pid > 0 &&
702 pid_is_unwaited(m->control_pid) &&
703 MOUNT_STATE_WITH_PROCESS(new_state)) {
704
705 r = unit_watch_pid(UNIT(m), m->control_pid);
706 if (r < 0)
707 return r;
708
709 r = mount_arm_timer(m, usec_add(u->state_change_timestamp.monotonic, m->timeout_usec));
710 if (r < 0)
711 return r;
712 }
713
714 if (!IN_SET(new_state, MOUNT_DEAD, MOUNT_FAILED))
715 (void) unit_setup_dynamic_creds(u);
716
717 mount_set_state(m, new_state);
718 return 0;
719 }
720
721 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
722 Mount *m = MOUNT(u);
723 MountParameters *p;
724
725 assert(m);
726 assert(f);
727
728 p = get_mount_parameters(m);
729
730 fprintf(f,
731 "%sMount State: %s\n"
732 "%sResult: %s\n"
733 "%sWhere: %s\n"
734 "%sWhat: %s\n"
735 "%sFile System Type: %s\n"
736 "%sOptions: %s\n"
737 "%sFrom /proc/self/mountinfo: %s\n"
738 "%sFrom fragment: %s\n"
739 "%sExtrinsic: %s\n"
740 "%sDirectoryMode: %04o\n"
741 "%sSloppyOptions: %s\n"
742 "%sLazyUnmount: %s\n"
743 "%sForceUnmount: %s\n",
744 prefix, mount_state_to_string(m->state),
745 prefix, mount_result_to_string(m->result),
746 prefix, m->where,
747 prefix, p ? strna(p->what) : "n/a",
748 prefix, p ? strna(p->fstype) : "n/a",
749 prefix, p ? strna(p->options) : "n/a",
750 prefix, yes_no(m->from_proc_self_mountinfo),
751 prefix, yes_no(m->from_fragment),
752 prefix, yes_no(mount_is_extrinsic(m)),
753 prefix, m->directory_mode,
754 prefix, yes_no(m->sloppy_options),
755 prefix, yes_no(m->lazy_unmount),
756 prefix, yes_no(m->force_unmount));
757
758 if (m->control_pid > 0)
759 fprintf(f,
760 "%sControl PID: "PID_FMT"\n",
761 prefix, m->control_pid);
762
763 exec_context_dump(&m->exec_context, f, prefix);
764 kill_context_dump(&m->kill_context, f, prefix);
765 cgroup_context_dump(&m->cgroup_context, f, prefix);
766 }
767
768 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
769 pid_t pid;
770 int r;
771 ExecParameters exec_params = {
772 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
773 .stdin_fd = -1,
774 .stdout_fd = -1,
775 .stderr_fd = -1,
776 };
777
778 assert(m);
779 assert(c);
780 assert(_pid);
781
782 (void) unit_realize_cgroup(UNIT(m));
783 if (m->reset_accounting) {
784 (void) unit_reset_cpu_accounting(UNIT(m));
785 (void) unit_reset_ip_accounting(UNIT(m));
786 m->reset_accounting = false;
787 }
788
789 r = unit_setup_exec_runtime(UNIT(m));
790 if (r < 0)
791 return r;
792
793 r = unit_setup_dynamic_creds(UNIT(m));
794 if (r < 0)
795 return r;
796
797 r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
798 if (r < 0)
799 return r;
800
801 manager_set_exec_params(UNIT(m)->manager, &exec_params);
802 unit_set_exec_params(UNIT(m), &exec_params);
803
804 r = exec_spawn(UNIT(m),
805 c,
806 &m->exec_context,
807 &exec_params,
808 m->exec_runtime,
809 &m->dynamic_creds,
810 &pid);
811 if (r < 0)
812 return r;
813
814 r = unit_watch_pid(UNIT(m), pid);
815 if (r < 0)
816 /* FIXME: we need to do something here */
817 return r;
818
819 *_pid = pid;
820
821 return 0;
822 }
823
824 static void mount_enter_dead(Mount *m, MountResult f) {
825 assert(m);
826
827 if (m->result == MOUNT_SUCCESS)
828 m->result = f;
829
830 if (m->result != MOUNT_SUCCESS)
831 log_unit_warning(UNIT(m), "Failed with result '%s'.", mount_result_to_string(m->result));
832
833 mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD);
834
835 exec_runtime_destroy(m->exec_runtime);
836 m->exec_runtime = exec_runtime_unref(m->exec_runtime);
837
838 exec_context_destroy_runtime_directory(&m->exec_context, UNIT(m)->manager->prefix[EXEC_DIRECTORY_RUNTIME]);
839
840 unit_unref_uid_gid(UNIT(m), true);
841
842 dynamic_creds_destroy(&m->dynamic_creds);
843 }
844
845 static void mount_enter_mounted(Mount *m, MountResult f) {
846 assert(m);
847
848 if (m->result == MOUNT_SUCCESS)
849 m->result = f;
850
851 mount_set_state(m, MOUNT_MOUNTED);
852 }
853
854 static void mount_enter_dead_or_mounted(Mount *m, MountResult f) {
855 assert(m);
856
857 /* Enter DEAD or MOUNTED state, depending on what the kernel currently says about the mount point. We use this
858 * whenever we executed an operation, so that our internal state reflects what the kernel says again, after all
859 * ultimately we just mirror the kernel's internal state on this. */
860
861 if (m->from_proc_self_mountinfo)
862 mount_enter_mounted(m, f);
863 else
864 mount_enter_dead(m, f);
865 }
866
867 static int state_to_kill_operation(MountState state) {
868 switch (state) {
869
870 case MOUNT_REMOUNTING_SIGTERM:
871 case MOUNT_UNMOUNTING_SIGTERM:
872 return KILL_TERMINATE;
873
874 case MOUNT_REMOUNTING_SIGKILL:
875 case MOUNT_UNMOUNTING_SIGKILL:
876 return KILL_KILL;
877
878 default:
879 return _KILL_OPERATION_INVALID;
880 }
881 }
882
883 static void mount_enter_signal(Mount *m, MountState state, MountResult f) {
884 int r;
885
886 assert(m);
887
888 if (m->result == MOUNT_SUCCESS)
889 m->result = f;
890
891 r = unit_kill_context(
892 UNIT(m),
893 &m->kill_context,
894 state_to_kill_operation(state),
895 -1,
896 m->control_pid,
897 false);
898 if (r < 0)
899 goto fail;
900
901 if (r > 0) {
902 r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
903 if (r < 0)
904 goto fail;
905
906 mount_set_state(m, state);
907 } else if (state == MOUNT_REMOUNTING_SIGTERM && m->kill_context.send_sigkill)
908 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
909 else if (IN_SET(state, MOUNT_REMOUNTING_SIGTERM, MOUNT_REMOUNTING_SIGKILL))
910 mount_enter_mounted(m, MOUNT_SUCCESS);
911 else if (state == MOUNT_UNMOUNTING_SIGTERM && m->kill_context.send_sigkill)
912 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS);
913 else
914 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
915
916 return;
917
918 fail:
919 log_unit_warning_errno(UNIT(m), r, "Failed to kill processes: %m");
920 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
921 }
922
923 static void mount_enter_unmounting(Mount *m) {
924 int r;
925
926 assert(m);
927
928 /* Start counting our attempts */
929 if (!IN_SET(m->state,
930 MOUNT_UNMOUNTING,
931 MOUNT_UNMOUNTING_SIGTERM,
932 MOUNT_UNMOUNTING_SIGKILL))
933 m->n_retry_umount = 0;
934
935 m->control_command_id = MOUNT_EXEC_UNMOUNT;
936 m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
937
938 r = exec_command_set(m->control_command, UMOUNT_PATH, m->where, "-c", NULL);
939 if (r >= 0 && m->lazy_unmount)
940 r = exec_command_append(m->control_command, "-l", NULL);
941 if (r >= 0 && m->force_unmount)
942 r = exec_command_append(m->control_command, "-f", NULL);
943 if (r < 0)
944 goto fail;
945
946 mount_unwatch_control_pid(m);
947
948 r = mount_spawn(m, m->control_command, &m->control_pid);
949 if (r < 0)
950 goto fail;
951
952 mount_set_state(m, MOUNT_UNMOUNTING);
953
954 return;
955
956 fail:
957 log_unit_warning_errno(UNIT(m), r, "Failed to run 'umount' task: %m");
958 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
959 }
960
961 static void mount_enter_mounting(Mount *m) {
962 int r;
963 MountParameters *p;
964
965 assert(m);
966
967 m->control_command_id = MOUNT_EXEC_MOUNT;
968 m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
969
970 r = unit_fail_if_symlink(UNIT(m), m->where);
971 if (r < 0)
972 goto fail;
973
974 (void) mkdir_p_label(m->where, m->directory_mode);
975
976 unit_warn_if_dir_nonempty(UNIT(m), m->where);
977
978 /* Create the source directory for bind-mounts if needed */
979 p = get_mount_parameters_fragment(m);
980 if (p && mount_is_bind(p))
981 (void) mkdir_p_label(p->what, m->directory_mode);
982
983 if (p) {
984 _cleanup_free_ char *opts = NULL;
985
986 r = fstab_filter_options(p->options, "nofail\0" "noauto\0" "auto\0", NULL, NULL, &opts);
987 if (r < 0)
988 goto fail;
989
990 r = exec_command_set(m->control_command, MOUNT_PATH, p->what, m->where, NULL);
991 if (r >= 0 && m->sloppy_options)
992 r = exec_command_append(m->control_command, "-s", NULL);
993 if (r >= 0 && p->fstype)
994 r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
995 if (r >= 0 && !isempty(opts))
996 r = exec_command_append(m->control_command, "-o", opts, NULL);
997 } else
998 r = -ENOENT;
999 if (r < 0)
1000 goto fail;
1001
1002 mount_unwatch_control_pid(m);
1003
1004 r = mount_spawn(m, m->control_command, &m->control_pid);
1005 if (r < 0)
1006 goto fail;
1007
1008 mount_set_state(m, MOUNT_MOUNTING);
1009
1010 return;
1011
1012 fail:
1013 log_unit_warning_errno(UNIT(m), r, "Failed to run 'mount' task: %m");
1014 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
1015 }
1016
1017 static void mount_set_reload_result(Mount *m, MountResult result) {
1018 assert(m);
1019
1020 /* Only store the first error we encounter */
1021 if (m->reload_result != MOUNT_SUCCESS)
1022 return;
1023
1024 m->reload_result = result;
1025 }
1026
1027 static void mount_enter_remounting(Mount *m) {
1028 int r;
1029 MountParameters *p;
1030
1031 assert(m);
1032
1033 /* Reset reload result when we are about to start a new remount operation */
1034 m->reload_result = MOUNT_SUCCESS;
1035
1036 m->control_command_id = MOUNT_EXEC_REMOUNT;
1037 m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
1038
1039 p = get_mount_parameters_fragment(m);
1040 if (p) {
1041 const char *o;
1042
1043 if (p->options)
1044 o = strjoina("remount,", p->options);
1045 else
1046 o = "remount";
1047
1048 r = exec_command_set(m->control_command, MOUNT_PATH,
1049 p->what, m->where,
1050 "-o", o, NULL);
1051 if (r >= 0 && m->sloppy_options)
1052 r = exec_command_append(m->control_command, "-s", NULL);
1053 if (r >= 0 && p->fstype)
1054 r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
1055 } else
1056 r = -ENOENT;
1057 if (r < 0)
1058 goto fail;
1059
1060 mount_unwatch_control_pid(m);
1061
1062 r = mount_spawn(m, m->control_command, &m->control_pid);
1063 if (r < 0)
1064 goto fail;
1065
1066 mount_set_state(m, MOUNT_REMOUNTING);
1067
1068 return;
1069
1070 fail:
1071 log_unit_warning_errno(UNIT(m), r, "Failed to run 'remount' task: %m");
1072 mount_set_reload_result(m, MOUNT_FAILURE_RESOURCES);
1073 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1074 }
1075
1076 static int mount_start(Unit *u) {
1077 Mount *m = MOUNT(u);
1078 int r;
1079
1080 assert(m);
1081
1082 /* We cannot fulfill this request right now, try again later
1083 * please! */
1084 if (IN_SET(m->state,
1085 MOUNT_UNMOUNTING,
1086 MOUNT_UNMOUNTING_SIGTERM,
1087 MOUNT_UNMOUNTING_SIGKILL))
1088 return -EAGAIN;
1089
1090 /* Already on it! */
1091 if (m->state == MOUNT_MOUNTING)
1092 return 0;
1093
1094 assert(IN_SET(m->state, MOUNT_DEAD, MOUNT_FAILED));
1095
1096 r = unit_start_limit_test(u);
1097 if (r < 0) {
1098 mount_enter_dead(m, MOUNT_FAILURE_START_LIMIT_HIT);
1099 return r;
1100 }
1101
1102 r = unit_acquire_invocation_id(u);
1103 if (r < 0)
1104 return r;
1105
1106 m->result = MOUNT_SUCCESS;
1107 m->reload_result = MOUNT_SUCCESS;
1108 m->reset_accounting = true;
1109
1110 mount_enter_mounting(m);
1111 return 1;
1112 }
1113
1114 static int mount_stop(Unit *u) {
1115 Mount *m = MOUNT(u);
1116
1117 assert(m);
1118
1119 switch (m->state) {
1120
1121 case MOUNT_UNMOUNTING:
1122 case MOUNT_UNMOUNTING_SIGKILL:
1123 case MOUNT_UNMOUNTING_SIGTERM:
1124 /* Already on it */
1125 return 0;
1126
1127 case MOUNT_MOUNTING:
1128 case MOUNT_MOUNTING_DONE:
1129 case MOUNT_REMOUNTING:
1130 /* If we are still waiting for /bin/mount, we go directly into kill mode. */
1131 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_SUCCESS);
1132 return 0;
1133
1134 case MOUNT_REMOUNTING_SIGTERM:
1135 /* If we are already waiting for a hung remount, convert this to the matching unmounting state */
1136 mount_set_state(m, MOUNT_UNMOUNTING_SIGTERM);
1137 return 0;
1138
1139 case MOUNT_REMOUNTING_SIGKILL:
1140 /* as above */
1141 mount_set_state(m, MOUNT_UNMOUNTING_SIGKILL);
1142 return 0;
1143
1144 case MOUNT_MOUNTED:
1145 mount_enter_unmounting(m);
1146 return 1;
1147
1148 default:
1149 assert_not_reached("Unexpected state.");
1150 }
1151 }
1152
1153 static int mount_reload(Unit *u) {
1154 Mount *m = MOUNT(u);
1155
1156 assert(m);
1157
1158 if (m->state == MOUNT_MOUNTING_DONE) /* not yet ready to reload, try again */
1159 return -EAGAIN;
1160
1161 assert(m->state == MOUNT_MOUNTED);
1162
1163 mount_enter_remounting(m);
1164
1165 return 1;
1166 }
1167
1168 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
1169 Mount *m = MOUNT(u);
1170
1171 assert(m);
1172 assert(f);
1173 assert(fds);
1174
1175 unit_serialize_item(u, f, "state", mount_state_to_string(m->state));
1176 unit_serialize_item(u, f, "result", mount_result_to_string(m->result));
1177 unit_serialize_item(u, f, "reload-result", mount_result_to_string(m->reload_result));
1178
1179 if (m->control_pid > 0)
1180 unit_serialize_item_format(u, f, "control-pid", PID_FMT, m->control_pid);
1181
1182 if (m->control_command_id >= 0)
1183 unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id));
1184
1185 return 0;
1186 }
1187
1188 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1189 Mount *m = MOUNT(u);
1190
1191 assert(u);
1192 assert(key);
1193 assert(value);
1194 assert(fds);
1195
1196 if (streq(key, "state")) {
1197 MountState state;
1198
1199 if ((state = mount_state_from_string(value)) < 0)
1200 log_unit_debug(u, "Failed to parse state value: %s", value);
1201 else
1202 m->deserialized_state = state;
1203 } else if (streq(key, "result")) {
1204 MountResult f;
1205
1206 f = mount_result_from_string(value);
1207 if (f < 0)
1208 log_unit_debug(u, "Failed to parse result value: %s", value);
1209 else if (f != MOUNT_SUCCESS)
1210 m->result = f;
1211
1212 } else if (streq(key, "reload-result")) {
1213 MountResult f;
1214
1215 f = mount_result_from_string(value);
1216 if (f < 0)
1217 log_unit_debug(u, "Failed to parse reload result value: %s", value);
1218 else if (f != MOUNT_SUCCESS)
1219 m->reload_result = f;
1220
1221 } else if (streq(key, "control-pid")) {
1222 pid_t pid;
1223
1224 if (parse_pid(value, &pid) < 0)
1225 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
1226 else
1227 m->control_pid = pid;
1228 } else if (streq(key, "control-command")) {
1229 MountExecCommand id;
1230
1231 id = mount_exec_command_from_string(value);
1232 if (id < 0)
1233 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
1234 else {
1235 m->control_command_id = id;
1236 m->control_command = m->exec_command + id;
1237 }
1238 } else
1239 log_unit_debug(u, "Unknown serialization key: %s", key);
1240
1241 return 0;
1242 }
1243
1244 _pure_ static UnitActiveState mount_active_state(Unit *u) {
1245 assert(u);
1246
1247 return state_translation_table[MOUNT(u)->state];
1248 }
1249
1250 _pure_ static const char *mount_sub_state_to_string(Unit *u) {
1251 assert(u);
1252
1253 return mount_state_to_string(MOUNT(u)->state);
1254 }
1255
1256 _pure_ static bool mount_check_gc(Unit *u) {
1257 Mount *m = MOUNT(u);
1258
1259 assert(m);
1260
1261 return m->from_proc_self_mountinfo;
1262 }
1263
1264 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1265 Mount *m = MOUNT(u);
1266 MountResult f;
1267
1268 assert(m);
1269 assert(pid >= 0);
1270
1271 if (pid != m->control_pid)
1272 return;
1273
1274 m->control_pid = 0;
1275
1276 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
1277 f = MOUNT_SUCCESS;
1278 else if (code == CLD_EXITED)
1279 f = MOUNT_FAILURE_EXIT_CODE;
1280 else if (code == CLD_KILLED)
1281 f = MOUNT_FAILURE_SIGNAL;
1282 else if (code == CLD_DUMPED)
1283 f = MOUNT_FAILURE_CORE_DUMP;
1284 else
1285 assert_not_reached("Unknown code");
1286
1287 if (IN_SET(m->state, MOUNT_REMOUNTING, MOUNT_REMOUNTING_SIGKILL, MOUNT_REMOUNTING_SIGTERM))
1288 mount_set_reload_result(m, f);
1289 else if (m->result == MOUNT_SUCCESS)
1290 m->result = f;
1291
1292 if (m->control_command) {
1293 exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status);
1294
1295 m->control_command = NULL;
1296 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1297 }
1298
1299 log_unit_full(u, f == MOUNT_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0,
1300 "Mount process exited, code=%s status=%i", sigchld_code_to_string(code), status);
1301
1302 /* Note that mount(8) returning and the kernel sending us a mount table change event might happen
1303 * out-of-order. If an operation succeed we assume the kernel will follow soon too and already change into the
1304 * resulting state. If it fails we check if the kernel still knows about the mount. and change state
1305 * accordingly. */
1306
1307 switch (m->state) {
1308
1309 case MOUNT_MOUNTING:
1310 case MOUNT_MOUNTING_DONE:
1311
1312 if (f == MOUNT_SUCCESS || m->from_proc_self_mountinfo)
1313 /* If /bin/mount returned success, or if we see the mount point in /proc/self/mountinfo we are
1314 * happy. If we see the first condition first, we should see the second condition
1315 * immediately after – or /bin/mount lies to us and is broken. */
1316 mount_enter_mounted(m, f);
1317 else
1318 mount_enter_dead(m, f);
1319 break;
1320
1321 case MOUNT_REMOUNTING:
1322 case MOUNT_REMOUNTING_SIGTERM:
1323 case MOUNT_REMOUNTING_SIGKILL:
1324 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1325 break;
1326
1327 case MOUNT_UNMOUNTING:
1328 case MOUNT_UNMOUNTING_SIGKILL:
1329 case MOUNT_UNMOUNTING_SIGTERM:
1330
1331 if (m->from_proc_self_mountinfo) {
1332
1333 /* Still a mount point? If so, let's try again. Most likely there were multiple mount points
1334 * stacked on top of each other. Note that due to the io event priority logic we can be sure
1335 * the new mountinfo is loaded before we process the SIGCHLD for the mount command. */
1336
1337 if (m->n_retry_umount < RETRY_UMOUNT_MAX) {
1338 log_unit_debug(u, "Mount still present, trying again.");
1339 m->n_retry_umount++;
1340 mount_enter_unmounting(m);
1341 } else {
1342 log_unit_debug(u, "Mount still present after %u attempts to unmount, giving up.", m->n_retry_umount);
1343 mount_enter_mounted(m, f);
1344 }
1345 } else
1346 mount_enter_dead(m, f);
1347
1348 break;
1349
1350 default:
1351 assert_not_reached("Uh, control process died at wrong time.");
1352 }
1353
1354 /* Notify clients about changed exit status */
1355 unit_add_to_dbus_queue(u);
1356 }
1357
1358 static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
1359 Mount *m = MOUNT(userdata);
1360
1361 assert(m);
1362 assert(m->timer_event_source == source);
1363
1364 switch (m->state) {
1365
1366 case MOUNT_MOUNTING:
1367 case MOUNT_MOUNTING_DONE:
1368 log_unit_warning(UNIT(m), "Mounting timed out. Terminating.");
1369 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1370 break;
1371
1372 case MOUNT_REMOUNTING:
1373 log_unit_warning(UNIT(m), "Remounting timed out. Terminating remount process.");
1374 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1375 mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, MOUNT_SUCCESS);
1376 break;
1377
1378 case MOUNT_REMOUNTING_SIGTERM:
1379 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1380
1381 if (m->kill_context.send_sigkill) {
1382 log_unit_warning(UNIT(m), "Remounting timed out. Killing.");
1383 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
1384 } else {
1385 log_unit_warning(UNIT(m), "Remounting timed out. Skipping SIGKILL. Ignoring.");
1386 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1387 }
1388 break;
1389
1390 case MOUNT_REMOUNTING_SIGKILL:
1391 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1392
1393 log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
1394 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1395 break;
1396
1397 case MOUNT_UNMOUNTING:
1398 log_unit_warning(UNIT(m), "Unmounting timed out. Terminating.");
1399 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1400 break;
1401
1402 case MOUNT_UNMOUNTING_SIGTERM:
1403 if (m->kill_context.send_sigkill) {
1404 log_unit_warning(UNIT(m), "Mount process timed out. Killing.");
1405 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
1406 } else {
1407 log_unit_warning(UNIT(m), "Mount process timed out. Skipping SIGKILL. Ignoring.");
1408 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
1409 }
1410 break;
1411
1412 case MOUNT_UNMOUNTING_SIGKILL:
1413 log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
1414 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
1415 break;
1416
1417 default:
1418 assert_not_reached("Timeout at wrong time.");
1419 }
1420
1421 return 0;
1422 }
1423
1424 typedef struct {
1425 bool is_mounted;
1426 bool just_mounted;
1427 bool just_changed;
1428 } MountSetupFlags;
1429
1430 static int mount_setup_new_unit(
1431 Unit *u,
1432 const char *what,
1433 const char *where,
1434 const char *options,
1435 const char *fstype,
1436 MountSetupFlags *flags) {
1437
1438 MountParameters *p;
1439
1440 assert(u);
1441 assert(flags);
1442
1443 u->source_path = strdup("/proc/self/mountinfo");
1444 MOUNT(u)->where = strdup(where);
1445 if (!u->source_path || !MOUNT(u)->where)
1446 return -ENOMEM;
1447
1448 /* Make sure to initialize those fields before mount_is_extrinsic(). */
1449 MOUNT(u)->from_proc_self_mountinfo = true;
1450 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1451
1452 p->what = strdup(what);
1453 p->options = strdup(options);
1454 p->fstype = strdup(fstype);
1455 if (!p->what || !p->options || !p->fstype)
1456 return -ENOMEM;
1457
1458 if (!mount_is_extrinsic(MOUNT(u))) {
1459 const char *target;
1460 int r;
1461
1462 target = mount_is_network(p) ? SPECIAL_REMOTE_FS_TARGET : SPECIAL_LOCAL_FS_TARGET;
1463 r = unit_add_dependency_by_name(u, UNIT_BEFORE, target, NULL, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
1464 if (r < 0)
1465 return r;
1466
1467 r = unit_add_dependency_by_name(u, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
1468 if (r < 0)
1469 return r;
1470 }
1471
1472 unit_add_to_load_queue(u);
1473 flags->is_mounted = true;
1474 flags->just_mounted = true;
1475 flags->just_changed = true;
1476
1477 return 0;
1478 }
1479
1480 static int mount_setup_existing_unit(
1481 Unit *u,
1482 const char *what,
1483 const char *where,
1484 const char *options,
1485 const char *fstype,
1486 MountSetupFlags *flags) {
1487
1488 MountParameters *p;
1489 bool load_extras = false;
1490 int r1, r2, r3;
1491
1492 assert(u);
1493 assert(flags);
1494
1495 if (!MOUNT(u)->where) {
1496 MOUNT(u)->where = strdup(where);
1497 if (!MOUNT(u)->where)
1498 return -ENOMEM;
1499 }
1500
1501 /* Make sure to initialize those fields before mount_is_extrinsic(). */
1502 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1503
1504 r1 = free_and_strdup(&p->what, what);
1505 r2 = free_and_strdup(&p->options, options);
1506 r3 = free_and_strdup(&p->fstype, fstype);
1507 if (r1 < 0 || r2 < 0 || r3 < 0)
1508 return -ENOMEM;
1509
1510 flags->just_changed = r1 > 0 || r2 > 0 || r3 > 0;
1511 flags->is_mounted = true;
1512 flags->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
1513
1514 MOUNT(u)->from_proc_self_mountinfo = true;
1515
1516 if (!mount_is_extrinsic(MOUNT(u)) && mount_is_network(p)) {
1517 /* _netdev option may have shown up late, or on a
1518 * remount. Add remote-fs dependencies, even though
1519 * local-fs ones may already be there.
1520 *
1521 * Note: due to a current limitation (we don't track
1522 * in the dependency "Set*" objects who created a
1523 * dependency), we can only add deps, never lose them,
1524 * until the next full daemon-reload. */
1525 unit_add_dependency_by_name(u, UNIT_BEFORE, SPECIAL_REMOTE_FS_TARGET, NULL, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
1526 load_extras = true;
1527 }
1528
1529 if (u->load_state == UNIT_NOT_FOUND) {
1530 u->load_state = UNIT_LOADED;
1531 u->load_error = 0;
1532
1533 /* Load in the extras later on, after we
1534 * finished initialization of the unit */
1535
1536 /* FIXME: since we're going to load the unit later on, why setting load_extras=true ? */
1537 load_extras = true;
1538 flags->just_changed = true;
1539 }
1540
1541 if (load_extras)
1542 return mount_add_extras(MOUNT(u));
1543
1544 return 0;
1545 }
1546
1547 static int mount_setup_unit(
1548 Manager *m,
1549 const char *what,
1550 const char *where,
1551 const char *options,
1552 const char *fstype,
1553 bool set_flags) {
1554
1555 _cleanup_free_ char *e = NULL;
1556 MountSetupFlags flags;
1557 Unit *u;
1558 int r;
1559
1560 assert(m);
1561 assert(what);
1562 assert(where);
1563 assert(options);
1564 assert(fstype);
1565
1566 /* Ignore API mount points. They should never be referenced in
1567 * dependencies ever. */
1568 if (mount_point_is_api(where) || mount_point_ignore(where))
1569 return 0;
1570
1571 if (streq(fstype, "autofs"))
1572 return 0;
1573
1574 /* probably some kind of swap, ignore */
1575 if (!is_path(where))
1576 return 0;
1577
1578 r = unit_name_from_path(where, ".mount", &e);
1579 if (r < 0)
1580 return r;
1581
1582 u = manager_get_unit(m, e);
1583 if (!u) {
1584 /* First time we see this mount point meaning that it's
1585 * not been initiated by a mount unit but rather by the
1586 * sysadmin having called mount(8) directly. */
1587 r = unit_new_for_name(m, sizeof(Mount), e, &u);
1588 if (r < 0)
1589 goto fail;
1590
1591 r = mount_setup_new_unit(u, what, where, options, fstype, &flags);
1592 if (r < 0)
1593 unit_free(u);
1594 } else
1595 r = mount_setup_existing_unit(u, what, where, options, fstype, &flags);
1596
1597 if (r < 0)
1598 goto fail;
1599
1600 if (set_flags) {
1601 MOUNT(u)->is_mounted = flags.is_mounted;
1602 MOUNT(u)->just_mounted = flags.just_mounted;
1603 MOUNT(u)->just_changed = flags.just_changed;
1604 }
1605
1606 if (flags.just_changed)
1607 unit_add_to_dbus_queue(u);
1608
1609 return 0;
1610 fail:
1611 log_warning_errno(r, "Failed to set up mount unit: %m");
1612 return r;
1613 }
1614
1615 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1616 _cleanup_(mnt_free_tablep) struct libmnt_table *t = NULL;
1617 _cleanup_(mnt_free_iterp) struct libmnt_iter *i = NULL;
1618 int r = 0;
1619
1620 assert(m);
1621
1622 t = mnt_new_table();
1623 if (!t)
1624 return log_oom();
1625
1626 i = mnt_new_iter(MNT_ITER_FORWARD);
1627 if (!i)
1628 return log_oom();
1629
1630 r = mnt_table_parse_mtab(t, NULL);
1631 if (r < 0)
1632 return log_error_errno(r, "Failed to parse /proc/self/mountinfo: %m");
1633
1634 r = 0;
1635 for (;;) {
1636 const char *device, *path, *options, *fstype;
1637 _cleanup_free_ char *d = NULL, *p = NULL;
1638 struct libmnt_fs *fs;
1639 int k;
1640
1641 k = mnt_table_next_fs(t, i, &fs);
1642 if (k == 1)
1643 break;
1644 if (k < 0)
1645 return log_error_errno(k, "Failed to get next entry from /proc/self/mountinfo: %m");
1646
1647 device = mnt_fs_get_source(fs);
1648 path = mnt_fs_get_target(fs);
1649 options = mnt_fs_get_options(fs);
1650 fstype = mnt_fs_get_fstype(fs);
1651
1652 if (!device || !path)
1653 continue;
1654
1655 if (cunescape(device, UNESCAPE_RELAX, &d) < 0)
1656 return log_oom();
1657
1658 if (cunescape(path, UNESCAPE_RELAX, &p) < 0)
1659 return log_oom();
1660
1661 (void) device_found_node(m, d, true, DEVICE_FOUND_MOUNT, set_flags);
1662
1663 k = mount_setup_unit(m, d, p, options, fstype, set_flags);
1664 if (r == 0 && k < 0)
1665 r = k;
1666 }
1667
1668 return r;
1669 }
1670
1671 static void mount_shutdown(Manager *m) {
1672 assert(m);
1673
1674 m->mount_event_source = sd_event_source_unref(m->mount_event_source);
1675
1676 mnt_unref_monitor(m->mount_monitor);
1677 m->mount_monitor = NULL;
1678 }
1679
1680 static int mount_get_timeout(Unit *u, usec_t *timeout) {
1681 Mount *m = MOUNT(u);
1682 usec_t t;
1683 int r;
1684
1685 if (!m->timer_event_source)
1686 return 0;
1687
1688 r = sd_event_source_get_time(m->timer_event_source, &t);
1689 if (r < 0)
1690 return r;
1691 if (t == USEC_INFINITY)
1692 return 0;
1693
1694 *timeout = t;
1695 return 1;
1696 }
1697
1698 static int synthesize_root_mount(Manager *m) {
1699 Unit *u;
1700 int r;
1701
1702 assert(m);
1703
1704 /* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's
1705 * unconditionally synthesize it here and mark it as perpetual. */
1706
1707 u = manager_get_unit(m, SPECIAL_ROOT_MOUNT);
1708 if (!u) {
1709 r = unit_new_for_name(m, sizeof(Mount), SPECIAL_ROOT_MOUNT, &u);
1710 if (r < 0)
1711 return log_error_errno(r, "Failed to allocate the special " SPECIAL_ROOT_MOUNT " unit: %m");
1712 }
1713
1714 u->perpetual = true;
1715 MOUNT(u)->deserialized_state = MOUNT_MOUNTED;
1716
1717 unit_add_to_load_queue(u);
1718 unit_add_to_dbus_queue(u);
1719
1720 return 0;
1721 }
1722
1723 static bool mount_is_mounted(Mount *m) {
1724 assert(m);
1725
1726 return UNIT(m)->perpetual || m->is_mounted;
1727 }
1728
1729 static void mount_enumerate(Manager *m) {
1730 int r;
1731
1732 assert(m);
1733
1734 r = synthesize_root_mount(m);
1735 if (r < 0)
1736 goto fail;
1737
1738 mnt_init_debug(0);
1739
1740 if (!m->mount_monitor) {
1741 int fd;
1742
1743 m->mount_monitor = mnt_new_monitor();
1744 if (!m->mount_monitor) {
1745 log_oom();
1746 goto fail;
1747 }
1748
1749 r = mnt_monitor_enable_kernel(m->mount_monitor, 1);
1750 if (r < 0) {
1751 log_error_errno(r, "Failed to enable watching of kernel mount events: %m");
1752 goto fail;
1753 }
1754
1755 r = mnt_monitor_enable_userspace(m->mount_monitor, 1, NULL);
1756 if (r < 0) {
1757 log_error_errno(r, "Failed to enable watching of userspace mount events: %m");
1758 goto fail;
1759 }
1760
1761 /* mnt_unref_monitor() will close the fd */
1762 fd = r = mnt_monitor_get_fd(m->mount_monitor);
1763 if (r < 0) {
1764 log_error_errno(r, "Failed to acquire watch file descriptor: %m");
1765 goto fail;
1766 }
1767
1768 r = sd_event_add_io(m->event, &m->mount_event_source, fd, EPOLLIN, mount_dispatch_io, m);
1769 if (r < 0) {
1770 log_error_errno(r, "Failed to watch mount file descriptor: %m");
1771 goto fail;
1772 }
1773
1774 r = sd_event_source_set_priority(m->mount_event_source, -10);
1775 if (r < 0) {
1776 log_error_errno(r, "Failed to adjust mount watch priority: %m");
1777 goto fail;
1778 }
1779
1780 (void) sd_event_source_set_description(m->mount_event_source, "mount-monitor-dispatch");
1781 }
1782
1783 r = mount_load_proc_self_mountinfo(m, false);
1784 if (r < 0)
1785 goto fail;
1786
1787 return;
1788
1789 fail:
1790 mount_shutdown(m);
1791 }
1792
1793 static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
1794 _cleanup_set_free_ Set *around = NULL, *gone = NULL;
1795 Manager *m = userdata;
1796 const char *what;
1797 Iterator i;
1798 Unit *u;
1799 int r;
1800
1801 assert(m);
1802 assert(revents & EPOLLIN);
1803
1804 if (fd == mnt_monitor_get_fd(m->mount_monitor)) {
1805 bool rescan = false;
1806
1807 /* Drain all events and verify that the event is valid.
1808 *
1809 * Note that libmount also monitors /run/mount mkdir if the
1810 * directory does not exist yet. The mkdir may generate event
1811 * which is irrelevant for us.
1812 *
1813 * error: r < 0; valid: r == 0, false positive: rc == 1 */
1814 do {
1815 r = mnt_monitor_next_change(m->mount_monitor, NULL, NULL);
1816 if (r == 0)
1817 rescan = true;
1818 else if (r < 0)
1819 return log_error_errno(r, "Failed to drain libmount events");
1820 } while (r == 0);
1821
1822 log_debug("libmount event [rescan: %s]", yes_no(rescan));
1823 if (!rescan)
1824 return 0;
1825 }
1826
1827 r = mount_load_proc_self_mountinfo(m, true);
1828 if (r < 0) {
1829 /* Reset flags, just in case, for later calls */
1830 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1831 Mount *mount = MOUNT(u);
1832
1833 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1834 }
1835
1836 return 0;
1837 }
1838
1839 manager_dispatch_load_queue(m);
1840
1841 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1842 Mount *mount = MOUNT(u);
1843
1844 if (!mount_is_mounted(mount)) {
1845
1846 /* A mount point is not around right now. It
1847 * might be gone, or might never have
1848 * existed. */
1849
1850 if (mount->from_proc_self_mountinfo &&
1851 mount->parameters_proc_self_mountinfo.what) {
1852
1853 /* Remember that this device might just have disappeared */
1854 if (set_ensure_allocated(&gone, &string_hash_ops) < 0 ||
1855 set_put(gone, mount->parameters_proc_self_mountinfo.what) < 0)
1856 log_oom(); /* we don't care too much about OOM here... */
1857 }
1858
1859 mount->from_proc_self_mountinfo = false;
1860
1861 switch (mount->state) {
1862
1863 case MOUNT_MOUNTED:
1864 /* This has just been unmounted by
1865 * somebody else, follow the state
1866 * change. */
1867 mount->result = MOUNT_SUCCESS; /* make sure we forget any earlier umount failures */
1868 mount_enter_dead(mount, MOUNT_SUCCESS);
1869 break;
1870
1871 default:
1872 break;
1873 }
1874
1875 } else if (mount->just_mounted || mount->just_changed) {
1876
1877 /* A mount point was added or changed */
1878
1879 switch (mount->state) {
1880
1881 case MOUNT_DEAD:
1882 case MOUNT_FAILED:
1883
1884 /* This has just been mounted by somebody else, follow the state change, but let's
1885 * generate a new invocation ID for this implicitly and automatically. */
1886 (void) unit_acquire_invocation_id(UNIT(mount));
1887 mount_enter_mounted(mount, MOUNT_SUCCESS);
1888 break;
1889
1890 case MOUNT_MOUNTING:
1891 mount_set_state(mount, MOUNT_MOUNTING_DONE);
1892 break;
1893
1894 default:
1895 /* Nothing really changed, but let's
1896 * issue an notification call
1897 * nonetheless, in case somebody is
1898 * waiting for this. (e.g. file system
1899 * ro/rw remounts.) */
1900 mount_set_state(mount, mount->state);
1901 break;
1902 }
1903 }
1904
1905 if (mount_is_mounted(mount) &&
1906 mount->from_proc_self_mountinfo &&
1907 mount->parameters_proc_self_mountinfo.what) {
1908
1909 if (set_ensure_allocated(&around, &string_hash_ops) < 0 ||
1910 set_put(around, mount->parameters_proc_self_mountinfo.what) < 0)
1911 log_oom();
1912 }
1913
1914 /* Reset the flags for later calls */
1915 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1916 }
1917
1918 SET_FOREACH(what, gone, i) {
1919 if (set_contains(around, what))
1920 continue;
1921
1922 /* Let the device units know that the device is no longer mounted */
1923 (void) device_found_node(m, what, false, DEVICE_FOUND_MOUNT, true);
1924 }
1925
1926 return 0;
1927 }
1928
1929 static void mount_reset_failed(Unit *u) {
1930 Mount *m = MOUNT(u);
1931
1932 assert(m);
1933
1934 if (m->state == MOUNT_FAILED)
1935 mount_set_state(m, MOUNT_DEAD);
1936
1937 m->result = MOUNT_SUCCESS;
1938 m->reload_result = MOUNT_SUCCESS;
1939 }
1940
1941 static int mount_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
1942 Mount *m = MOUNT(u);
1943
1944 assert(m);
1945
1946 return unit_kill_common(u, who, signo, -1, MOUNT(u)->control_pid, error);
1947 }
1948
1949 static int mount_control_pid(Unit *u) {
1950 Mount *m = MOUNT(u);
1951
1952 assert(m);
1953
1954 return m->control_pid;
1955 }
1956
1957 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1958 [MOUNT_EXEC_MOUNT] = "ExecMount",
1959 [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1960 [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1961 };
1962
1963 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1964
1965 static const char* const mount_result_table[_MOUNT_RESULT_MAX] = {
1966 [MOUNT_SUCCESS] = "success",
1967 [MOUNT_FAILURE_RESOURCES] = "resources",
1968 [MOUNT_FAILURE_TIMEOUT] = "timeout",
1969 [MOUNT_FAILURE_EXIT_CODE] = "exit-code",
1970 [MOUNT_FAILURE_SIGNAL] = "signal",
1971 [MOUNT_FAILURE_CORE_DUMP] = "core-dump",
1972 [MOUNT_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
1973 };
1974
1975 DEFINE_STRING_TABLE_LOOKUP(mount_result, MountResult);
1976
1977 const UnitVTable mount_vtable = {
1978 .object_size = sizeof(Mount),
1979 .exec_context_offset = offsetof(Mount, exec_context),
1980 .cgroup_context_offset = offsetof(Mount, cgroup_context),
1981 .kill_context_offset = offsetof(Mount, kill_context),
1982 .exec_runtime_offset = offsetof(Mount, exec_runtime),
1983 .dynamic_creds_offset = offsetof(Mount, dynamic_creds),
1984
1985 .sections =
1986 "Unit\0"
1987 "Mount\0"
1988 "Install\0",
1989 .private_section = "Mount",
1990
1991 .init = mount_init,
1992 .load = mount_load,
1993 .done = mount_done,
1994
1995 .coldplug = mount_coldplug,
1996
1997 .dump = mount_dump,
1998
1999 .start = mount_start,
2000 .stop = mount_stop,
2001 .reload = mount_reload,
2002
2003 .kill = mount_kill,
2004
2005 .serialize = mount_serialize,
2006 .deserialize_item = mount_deserialize_item,
2007
2008 .active_state = mount_active_state,
2009 .sub_state_to_string = mount_sub_state_to_string,
2010
2011 .check_gc = mount_check_gc,
2012
2013 .sigchld_event = mount_sigchld_event,
2014
2015 .reset_failed = mount_reset_failed,
2016
2017 .control_pid = mount_control_pid,
2018
2019 .bus_vtable = bus_mount_vtable,
2020 .bus_set_property = bus_mount_set_property,
2021 .bus_commit_properties = bus_mount_commit_properties,
2022
2023 .get_timeout = mount_get_timeout,
2024
2025 .can_transient = true,
2026
2027 .enumerate = mount_enumerate,
2028 .shutdown = mount_shutdown,
2029
2030 .status_message_formats = {
2031 .starting_stopping = {
2032 [0] = "Mounting %s...",
2033 [1] = "Unmounting %s...",
2034 },
2035 .finished_start_job = {
2036 [JOB_DONE] = "Mounted %s.",
2037 [JOB_FAILED] = "Failed to mount %s.",
2038 [JOB_TIMEOUT] = "Timed out mounting %s.",
2039 },
2040 .finished_stop_job = {
2041 [JOB_DONE] = "Unmounted %s.",
2042 [JOB_FAILED] = "Failed unmounting %s.",
2043 [JOB_TIMEOUT] = "Timed out unmounting %s.",
2044 },
2045 },
2046 };
Unnamed repository; edit this file 'description' to name the repository.