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Merge pull request #11230 from keszybz/version-string-alt
[thirdparty/systemd.git] / src / core / mount.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <errno.h>
4 #include <signal.h>
5 #include <stdio.h>
6 #include <sys/epoll.h>
7
8 #include <libmount.h>
9
10 #include "sd-messages.h"
11
12 #include "alloc-util.h"
13 #include "dbus-mount.h"
14 #include "dbus-unit.h"
15 #include "device.h"
16 #include "escape.h"
17 #include "exit-status.h"
18 #include "format-util.h"
19 #include "fstab-util.h"
20 #include "log.h"
21 #include "manager.h"
22 #include "mkdir.h"
23 #include "mount-setup.h"
24 #include "mount.h"
25 #include "mountpoint-util.h"
26 #include "parse-util.h"
27 #include "path-util.h"
28 #include "process-util.h"
29 #include "serialize.h"
30 #include "special.h"
31 #include "string-table.h"
32 #include "string-util.h"
33 #include "strv.h"
34 #include "unit-name.h"
35 #include "unit.h"
36
37 #define RETRY_UMOUNT_MAX 32
38
39 DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_table*, mnt_free_table);
40 DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_iter*, mnt_free_iter);
41
42 static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
43 [MOUNT_DEAD] = UNIT_INACTIVE,
44 [MOUNT_MOUNTING] = UNIT_ACTIVATING,
45 [MOUNT_MOUNTING_DONE] = UNIT_ACTIVATING,
46 [MOUNT_MOUNTED] = UNIT_ACTIVE,
47 [MOUNT_REMOUNTING] = UNIT_RELOADING,
48 [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
49 [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING,
50 [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING,
51 [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
52 [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
53 [MOUNT_FAILED] = UNIT_FAILED
54 };
55
56 static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
57 static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
58
59 static bool MOUNT_STATE_WITH_PROCESS(MountState state) {
60 return IN_SET(state,
61 MOUNT_MOUNTING,
62 MOUNT_MOUNTING_DONE,
63 MOUNT_REMOUNTING,
64 MOUNT_REMOUNTING_SIGTERM,
65 MOUNT_REMOUNTING_SIGKILL,
66 MOUNT_UNMOUNTING,
67 MOUNT_UNMOUNTING_SIGTERM,
68 MOUNT_UNMOUNTING_SIGKILL);
69 }
70
71 static bool mount_is_network(const MountParameters *p) {
72 assert(p);
73
74 if (fstab_test_option(p->options, "_netdev\0"))
75 return true;
76
77 if (p->fstype && fstype_is_network(p->fstype))
78 return true;
79
80 return false;
81 }
82
83 static bool mount_is_loop(const MountParameters *p) {
84 assert(p);
85
86 if (fstab_test_option(p->options, "loop\0"))
87 return true;
88
89 return false;
90 }
91
92 static bool mount_is_bind(const MountParameters *p) {
93 assert(p);
94
95 if (fstab_test_option(p->options, "bind\0" "rbind\0"))
96 return true;
97
98 if (p->fstype && STR_IN_SET(p->fstype, "bind", "rbind"))
99 return true;
100
101 return false;
102 }
103
104 static bool mount_is_auto(const MountParameters *p) {
105 assert(p);
106
107 return !fstab_test_option(p->options, "noauto\0");
108 }
109
110 static bool mount_is_automount(const MountParameters *p) {
111 assert(p);
112
113 return fstab_test_option(p->options,
114 "comment=systemd.automount\0"
115 "x-systemd.automount\0");
116 }
117
118 static bool mount_is_bound_to_device(const Mount *m) {
119 const MountParameters *p;
120
121 if (m->from_fragment)
122 return true;
123
124 p = &m->parameters_proc_self_mountinfo;
125 return fstab_test_option(p->options, "x-systemd.device-bound\0");
126 }
127
128 static bool mount_needs_quota(const MountParameters *p) {
129 assert(p);
130
131 /* Quotas are not enabled on network filesystems, but we want them, for example, on storage connected via
132 * iscsi. We hence don't use mount_is_network() here, as that would also return true for _netdev devices. */
133 if (p->fstype && fstype_is_network(p->fstype))
134 return false;
135
136 if (mount_is_bind(p))
137 return false;
138
139 return fstab_test_option(p->options,
140 "usrquota\0" "grpquota\0" "quota\0" "usrjquota\0" "grpjquota\0");
141 }
142
143 static void mount_init(Unit *u) {
144 Mount *m = MOUNT(u);
145
146 assert(u);
147 assert(u->load_state == UNIT_STUB);
148
149 m->timeout_usec = u->manager->default_timeout_start_usec;
150
151 m->exec_context.std_output = u->manager->default_std_output;
152 m->exec_context.std_error = u->manager->default_std_error;
153
154 m->directory_mode = 0755;
155
156 /* We need to make sure that /usr/bin/mount is always called
157 * in the same process group as us, so that the autofs kernel
158 * side doesn't send us another mount request while we are
159 * already trying to comply its last one. */
160 m->exec_context.same_pgrp = true;
161
162 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
163
164 u->ignore_on_isolate = true;
165 }
166
167 static int mount_arm_timer(Mount *m, usec_t usec) {
168 int r;
169
170 assert(m);
171
172 if (m->timer_event_source) {
173 r = sd_event_source_set_time(m->timer_event_source, usec);
174 if (r < 0)
175 return r;
176
177 return sd_event_source_set_enabled(m->timer_event_source, SD_EVENT_ONESHOT);
178 }
179
180 if (usec == USEC_INFINITY)
181 return 0;
182
183 r = sd_event_add_time(
184 UNIT(m)->manager->event,
185 &m->timer_event_source,
186 CLOCK_MONOTONIC,
187 usec, 0,
188 mount_dispatch_timer, m);
189 if (r < 0)
190 return r;
191
192 (void) sd_event_source_set_description(m->timer_event_source, "mount-timer");
193
194 return 0;
195 }
196
197 static void mount_unwatch_control_pid(Mount *m) {
198 assert(m);
199
200 if (m->control_pid <= 0)
201 return;
202
203 unit_unwatch_pid(UNIT(m), m->control_pid);
204 m->control_pid = 0;
205 }
206
207 static void mount_parameters_done(MountParameters *p) {
208 assert(p);
209
210 p->what = mfree(p->what);
211 p->options = mfree(p->options);
212 p->fstype = mfree(p->fstype);
213 }
214
215 static void mount_done(Unit *u) {
216 Mount *m = MOUNT(u);
217
218 assert(m);
219
220 m->where = mfree(m->where);
221
222 mount_parameters_done(&m->parameters_proc_self_mountinfo);
223 mount_parameters_done(&m->parameters_fragment);
224
225 m->exec_runtime = exec_runtime_unref(m->exec_runtime, false);
226 exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
227 m->control_command = NULL;
228
229 dynamic_creds_unref(&m->dynamic_creds);
230
231 mount_unwatch_control_pid(m);
232
233 m->timer_event_source = sd_event_source_unref(m->timer_event_source);
234 }
235
236 _pure_ static MountParameters* get_mount_parameters_fragment(Mount *m) {
237 assert(m);
238
239 if (m->from_fragment)
240 return &m->parameters_fragment;
241
242 return NULL;
243 }
244
245 _pure_ static MountParameters* get_mount_parameters(Mount *m) {
246 assert(m);
247
248 if (m->from_proc_self_mountinfo)
249 return &m->parameters_proc_self_mountinfo;
250
251 return get_mount_parameters_fragment(m);
252 }
253
254 static int mount_add_mount_dependencies(Mount *m) {
255 MountParameters *pm;
256 Unit *other;
257 Iterator i;
258 Set *s;
259 int r;
260
261 assert(m);
262
263 if (!path_equal(m->where, "/")) {
264 _cleanup_free_ char *parent = NULL;
265
266 /* Adds in links to other mount points that might lie further up in the hierarchy */
267
268 parent = dirname_malloc(m->where);
269 if (!parent)
270 return -ENOMEM;
271
272 r = unit_require_mounts_for(UNIT(m), parent, UNIT_DEPENDENCY_IMPLICIT);
273 if (r < 0)
274 return r;
275 }
276
277 /* Adds in dependencies to other mount points that might be needed for the source path (if this is a bind mount
278 * or a loop mount) to be available. */
279 pm = get_mount_parameters_fragment(m);
280 if (pm && pm->what &&
281 path_is_absolute(pm->what) &&
282 (mount_is_bind(pm) || mount_is_loop(pm) || !mount_is_network(pm))) {
283
284 r = unit_require_mounts_for(UNIT(m), pm->what, UNIT_DEPENDENCY_FILE);
285 if (r < 0)
286 return r;
287 }
288
289 /* Adds in dependencies to other units that use this path or paths further down in the hierarchy */
290 s = manager_get_units_requiring_mounts_for(UNIT(m)->manager, m->where);
291 SET_FOREACH(other, s, i) {
292
293 if (other->load_state != UNIT_LOADED)
294 continue;
295
296 if (other == UNIT(m))
297 continue;
298
299 r = unit_add_dependency(other, UNIT_AFTER, UNIT(m), true, UNIT_DEPENDENCY_PATH);
300 if (r < 0)
301 return r;
302
303 if (UNIT(m)->fragment_path) {
304 /* If we have fragment configuration, then make this dependency required */
305 r = unit_add_dependency(other, UNIT_REQUIRES, UNIT(m), true, UNIT_DEPENDENCY_PATH);
306 if (r < 0)
307 return r;
308 }
309 }
310
311 return 0;
312 }
313
314 static int mount_add_device_dependencies(Mount *m) {
315 bool device_wants_mount;
316 UnitDependencyMask mask;
317 MountParameters *p;
318 UnitDependency dep;
319 int r;
320
321 assert(m);
322
323 p = get_mount_parameters(m);
324 if (!p)
325 return 0;
326
327 if (!p->what)
328 return 0;
329
330 if (mount_is_bind(p))
331 return 0;
332
333 if (!is_device_path(p->what))
334 return 0;
335
336 /* /dev/root is a really weird thing, it's not a real device,
337 * but just a path the kernel exports for the root file system
338 * specified on the kernel command line. Ignore it here. */
339 if (path_equal(p->what, "/dev/root"))
340 return 0;
341
342 if (path_equal(m->where, "/"))
343 return 0;
344
345 device_wants_mount =
346 mount_is_auto(p) && !mount_is_automount(p) && MANAGER_IS_SYSTEM(UNIT(m)->manager);
347
348 /* Mount units from /proc/self/mountinfo are not bound to devices
349 * by default since they're subject to races when devices are
350 * unplugged. But the user can still force this dep with an
351 * appropriate option (or udev property) so the mount units are
352 * automatically stopped when the device disappears suddenly. */
353 dep = mount_is_bound_to_device(m) ? UNIT_BINDS_TO : UNIT_REQUIRES;
354
355 mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT;
356
357 r = unit_add_node_dependency(UNIT(m), p->what, device_wants_mount, dep, mask);
358 if (r < 0)
359 return r;
360
361 return 0;
362 }
363
364 static int mount_add_quota_dependencies(Mount *m) {
365 UnitDependencyMask mask;
366 MountParameters *p;
367 int r;
368
369 assert(m);
370
371 if (!MANAGER_IS_SYSTEM(UNIT(m)->manager))
372 return 0;
373
374 p = get_mount_parameters_fragment(m);
375 if (!p)
376 return 0;
377
378 if (!mount_needs_quota(p))
379 return 0;
380
381 mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT;
382
383 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, true, mask);
384 if (r < 0)
385 return r;
386
387 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, true, mask);
388 if (r < 0)
389 return r;
390
391 return 0;
392 }
393
394 static bool mount_is_extrinsic(Mount *m) {
395 MountParameters *p;
396 assert(m);
397
398 /* Returns true for all units that are "magic" and should be excluded from the usual start-up and shutdown
399 * dependencies. We call them "extrinsic" here, as they are generally mounted outside of the systemd dependency
400 * logic. We shouldn't attempt to manage them ourselves but it's fine if the user operates on them with us. */
401
402 if (!MANAGER_IS_SYSTEM(UNIT(m)->manager)) /* We only automatically manage mounts if we are in system mode */
403 return true;
404
405 if (PATH_IN_SET(m->where, /* Don't bother with the OS data itself */
406 "/",
407 "/usr"))
408 return true;
409
410 if (PATH_STARTSWITH_SET(m->where,
411 "/run/initramfs", /* This should stay around from before we boot until after we shutdown */
412 "/proc", /* All of this is API VFS */
413 "/sys", /* … dito … */
414 "/dev")) /* … dito … */
415 return true;
416
417 /* If this is an initrd mount, and we are not in the initrd, then leave this around forever, too. */
418 p = get_mount_parameters(m);
419 if (p && fstab_test_option(p->options, "x-initrd.mount\0") && !in_initrd())
420 return true;
421
422 return false;
423 }
424
425 static int mount_add_default_dependencies(Mount *m) {
426 const char *after, *before;
427 UnitDependencyMask mask;
428 MountParameters *p;
429 int r;
430
431 assert(m);
432
433 if (!UNIT(m)->default_dependencies)
434 return 0;
435
436 /* We do not add any default dependencies to /, /usr or /run/initramfs/, since they are guaranteed to stay
437 * mounted the whole time, since our system is on it. Also, don't bother with anything mounted below virtual
438 * file systems, it's also going to be virtual, and hence not worth the effort. */
439 if (mount_is_extrinsic(m))
440 return 0;
441
442 p = get_mount_parameters(m);
443 if (!p)
444 return 0;
445
446 mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_DEFAULT;
447
448 if (mount_is_network(p)) {
449 /* We order ourselves after network.target. This is
450 * primarily useful at shutdown: services that take
451 * down the network should order themselves before
452 * network.target, so that they are shut down only
453 * after this mount unit is stopped. */
454
455 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_NETWORK_TARGET, true, mask);
456 if (r < 0)
457 return r;
458
459 /* We pull in network-online.target, and order
460 * ourselves after it. This is useful at start-up to
461 * actively pull in tools that want to be started
462 * before we start mounting network file systems, and
463 * whose purpose it is to delay this until the network
464 * is "up". */
465
466 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_WANTS, UNIT_AFTER, SPECIAL_NETWORK_ONLINE_TARGET, true, mask);
467 if (r < 0)
468 return r;
469
470 after = SPECIAL_REMOTE_FS_PRE_TARGET;
471 before = SPECIAL_REMOTE_FS_TARGET;
472 } else {
473 after = SPECIAL_LOCAL_FS_PRE_TARGET;
474 before = SPECIAL_LOCAL_FS_TARGET;
475 }
476
477 r = unit_add_dependency_by_name(UNIT(m), UNIT_BEFORE, before, true, mask);
478 if (r < 0)
479 return r;
480
481 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, true, mask);
482 if (r < 0)
483 return r;
484
485 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, true, mask);
486 if (r < 0)
487 return r;
488
489 /* If this is a tmpfs mount then we have to unmount it before we try to deactivate swaps */
490 if (streq_ptr(p->fstype, "tmpfs")) {
491 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_SWAP_TARGET, true, mask);
492 if (r < 0)
493 return r;
494 }
495
496 return 0;
497 }
498
499 static int mount_verify(Mount *m) {
500 _cleanup_free_ char *e = NULL;
501 MountParameters *p;
502 int r;
503
504 assert(m);
505
506 if (UNIT(m)->load_state != UNIT_LOADED)
507 return 0;
508
509 if (!m->from_fragment && !m->from_proc_self_mountinfo && !UNIT(m)->perpetual)
510 return -ENOENT;
511
512 r = unit_name_from_path(m->where, ".mount", &e);
513 if (r < 0)
514 return log_unit_error_errno(UNIT(m), r, "Failed to generate unit name from mount path: %m");
515
516 if (!unit_has_name(UNIT(m), e)) {
517 log_unit_error(UNIT(m), "Where= setting doesn't match unit name. Refusing.");
518 return -ENOEXEC;
519 }
520
521 if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
522 log_unit_error(UNIT(m), "Cannot create mount unit for API file system %s. Refusing.", m->where);
523 return -ENOEXEC;
524 }
525
526 p = get_mount_parameters_fragment(m);
527 if (p && !p->what) {
528 log_unit_error(UNIT(m), "What= setting is missing. Refusing.");
529 return -ENOEXEC;
530 }
531
532 if (m->exec_context.pam_name && m->kill_context.kill_mode != KILL_CONTROL_GROUP) {
533 log_unit_error(UNIT(m), "Unit has PAM enabled. Kill mode must be set to control-group'. Refusing.");
534 return -ENOEXEC;
535 }
536
537 return 0;
538 }
539
540 static int mount_add_extras(Mount *m) {
541 Unit *u = UNIT(m);
542 int r;
543
544 assert(m);
545
546 /* Note: this call might be called after we already have been loaded once (and even when it has already been
547 * activated), in case data from /proc/self/mountinfo has changed. This means all code here needs to be ready
548 * to run with an already set up unit. */
549
550 if (u->fragment_path)
551 m->from_fragment = true;
552
553 if (!m->where) {
554 r = unit_name_to_path(u->id, &m->where);
555 if (r < 0)
556 return r;
557 }
558
559 path_simplify(m->where, false);
560
561 if (!u->description) {
562 r = unit_set_description(u, m->where);
563 if (r < 0)
564 return r;
565 }
566
567 r = mount_add_device_dependencies(m);
568 if (r < 0)
569 return r;
570
571 r = mount_add_mount_dependencies(m);
572 if (r < 0)
573 return r;
574
575 r = mount_add_quota_dependencies(m);
576 if (r < 0)
577 return r;
578
579 r = unit_patch_contexts(u);
580 if (r < 0)
581 return r;
582
583 r = unit_add_exec_dependencies(u, &m->exec_context);
584 if (r < 0)
585 return r;
586
587 r = unit_set_default_slice(u);
588 if (r < 0)
589 return r;
590
591 r = mount_add_default_dependencies(m);
592 if (r < 0)
593 return r;
594
595 return 0;
596 }
597
598 static int mount_load_root_mount(Unit *u) {
599 assert(u);
600
601 if (!unit_has_name(u, SPECIAL_ROOT_MOUNT))
602 return 0;
603
604 u->perpetual = true;
605 u->default_dependencies = false;
606
607 /* The stdio/kmsg bridge socket is on /, in order to avoid a dep loop, don't use kmsg logging for -.mount */
608 MOUNT(u)->exec_context.std_output = EXEC_OUTPUT_NULL;
609 MOUNT(u)->exec_context.std_input = EXEC_INPUT_NULL;
610
611 if (!u->description)
612 u->description = strdup("Root Mount");
613
614 return 1;
615 }
616
617 static int mount_load(Unit *u) {
618 Mount *m = MOUNT(u);
619 int r, q, w;
620
621 assert(u);
622 assert(u->load_state == UNIT_STUB);
623
624 r = mount_load_root_mount(u);
625
626 if (m->from_proc_self_mountinfo || u->perpetual)
627 q = unit_load_fragment_and_dropin_optional(u);
628 else
629 q = unit_load_fragment_and_dropin(u);
630
631 /* Add in some extras. Note we do this in all cases (even if we failed to load the unit) when announced by the
632 * kernel, because we need some things to be set up no matter what when the kernel establishes a mount and thus
633 * we need to update the state in our unit to track it. After all, consider that we don't allow changing the
634 * 'slice' field for a unit once it is active. */
635 if (u->load_state == UNIT_LOADED || m->from_proc_self_mountinfo || u->perpetual)
636 w = mount_add_extras(m);
637 else
638 w = 0;
639
640 if (r < 0)
641 return r;
642 if (q < 0)
643 return q;
644 if (w < 0)
645 return w;
646
647 return mount_verify(m);
648 }
649
650 static void mount_set_state(Mount *m, MountState state) {
651 MountState old_state;
652 assert(m);
653
654 if (m->state != state)
655 bus_unit_send_pending_change_signal(UNIT(m), false);
656
657 old_state = m->state;
658 m->state = state;
659
660 if (!MOUNT_STATE_WITH_PROCESS(state)) {
661 m->timer_event_source = sd_event_source_unref(m->timer_event_source);
662 mount_unwatch_control_pid(m);
663 m->control_command = NULL;
664 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
665 }
666
667 if (state != old_state)
668 log_unit_debug(UNIT(m), "Changed %s -> %s", mount_state_to_string(old_state), mount_state_to_string(state));
669
670 unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state],
671 m->reload_result == MOUNT_SUCCESS ? 0 : UNIT_NOTIFY_RELOAD_FAILURE);
672 }
673
674 static int mount_coldplug(Unit *u) {
675 Mount *m = MOUNT(u);
676 MountState new_state = MOUNT_DEAD;
677 int r;
678
679 assert(m);
680 assert(m->state == MOUNT_DEAD);
681
682 if (m->deserialized_state != m->state)
683 new_state = m->deserialized_state;
684 else if (m->from_proc_self_mountinfo)
685 new_state = MOUNT_MOUNTED;
686
687 if (new_state == m->state)
688 return 0;
689
690 if (m->control_pid > 0 &&
691 pid_is_unwaited(m->control_pid) &&
692 MOUNT_STATE_WITH_PROCESS(new_state)) {
693
694 r = unit_watch_pid(UNIT(m), m->control_pid);
695 if (r < 0)
696 return r;
697
698 r = mount_arm_timer(m, usec_add(u->state_change_timestamp.monotonic, m->timeout_usec));
699 if (r < 0)
700 return r;
701 }
702
703 if (!IN_SET(new_state, MOUNT_DEAD, MOUNT_FAILED)) {
704 (void) unit_setup_dynamic_creds(u);
705 (void) unit_setup_exec_runtime(u);
706 }
707
708 mount_set_state(m, new_state);
709 return 0;
710 }
711
712 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
713 char buf[FORMAT_TIMESPAN_MAX];
714 Mount *m = MOUNT(u);
715 MountParameters *p;
716
717 assert(m);
718 assert(f);
719
720 p = get_mount_parameters(m);
721
722 fprintf(f,
723 "%sMount State: %s\n"
724 "%sResult: %s\n"
725 "%sWhere: %s\n"
726 "%sWhat: %s\n"
727 "%sFile System Type: %s\n"
728 "%sOptions: %s\n"
729 "%sFrom /proc/self/mountinfo: %s\n"
730 "%sFrom fragment: %s\n"
731 "%sExtrinsic: %s\n"
732 "%sDirectoryMode: %04o\n"
733 "%sSloppyOptions: %s\n"
734 "%sLazyUnmount: %s\n"
735 "%sForceUnmount: %s\n"
736 "%sTimoutSec: %s\n",
737 prefix, mount_state_to_string(m->state),
738 prefix, mount_result_to_string(m->result),
739 prefix, m->where,
740 prefix, p ? strna(p->what) : "n/a",
741 prefix, p ? strna(p->fstype) : "n/a",
742 prefix, p ? strna(p->options) : "n/a",
743 prefix, yes_no(m->from_proc_self_mountinfo),
744 prefix, yes_no(m->from_fragment),
745 prefix, yes_no(mount_is_extrinsic(m)),
746 prefix, m->directory_mode,
747 prefix, yes_no(m->sloppy_options),
748 prefix, yes_no(m->lazy_unmount),
749 prefix, yes_no(m->force_unmount),
750 prefix, format_timespan(buf, sizeof(buf), m->timeout_usec, USEC_PER_SEC));
751
752 if (m->control_pid > 0)
753 fprintf(f,
754 "%sControl PID: "PID_FMT"\n",
755 prefix, m->control_pid);
756
757 exec_context_dump(&m->exec_context, f, prefix);
758 kill_context_dump(&m->kill_context, f, prefix);
759 cgroup_context_dump(&m->cgroup_context, f, prefix);
760 }
761
762 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
763
764 _cleanup_(exec_params_clear) ExecParameters exec_params = {
765 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
766 .stdin_fd = -1,
767 .stdout_fd = -1,
768 .stderr_fd = -1,
769 .exec_fd = -1,
770 };
771 pid_t pid;
772 int r;
773
774 assert(m);
775 assert(c);
776 assert(_pid);
777
778 r = unit_prepare_exec(UNIT(m));
779 if (r < 0)
780 return r;
781
782 r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
783 if (r < 0)
784 return r;
785
786 r = unit_set_exec_params(UNIT(m), &exec_params);
787 if (r < 0)
788 return r;
789
790 r = exec_spawn(UNIT(m),
791 c,
792 &m->exec_context,
793 &exec_params,
794 m->exec_runtime,
795 &m->dynamic_creds,
796 &pid);
797 if (r < 0)
798 return r;
799
800 r = unit_watch_pid(UNIT(m), pid);
801 if (r < 0)
802 /* FIXME: we need to do something here */
803 return r;
804
805 *_pid = pid;
806
807 return 0;
808 }
809
810 static void mount_enter_dead(Mount *m, MountResult f) {
811 assert(m);
812
813 if (m->result == MOUNT_SUCCESS)
814 m->result = f;
815
816 unit_log_result(UNIT(m), m->result == MOUNT_SUCCESS, mount_result_to_string(m->result));
817 mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD);
818
819 m->exec_runtime = exec_runtime_unref(m->exec_runtime, true);
820
821 exec_context_destroy_runtime_directory(&m->exec_context, UNIT(m)->manager->prefix[EXEC_DIRECTORY_RUNTIME]);
822
823 unit_unref_uid_gid(UNIT(m), true);
824
825 dynamic_creds_destroy(&m->dynamic_creds);
826 }
827
828 static void mount_enter_mounted(Mount *m, MountResult f) {
829 assert(m);
830
831 if (m->result == MOUNT_SUCCESS)
832 m->result = f;
833
834 mount_set_state(m, MOUNT_MOUNTED);
835 }
836
837 static void mount_enter_dead_or_mounted(Mount *m, MountResult f) {
838 assert(m);
839
840 /* Enter DEAD or MOUNTED state, depending on what the kernel currently says about the mount point. We use this
841 * whenever we executed an operation, so that our internal state reflects what the kernel says again, after all
842 * ultimately we just mirror the kernel's internal state on this. */
843
844 if (m->from_proc_self_mountinfo)
845 mount_enter_mounted(m, f);
846 else
847 mount_enter_dead(m, f);
848 }
849
850 static int state_to_kill_operation(MountState state) {
851 switch (state) {
852
853 case MOUNT_REMOUNTING_SIGTERM:
854 case MOUNT_UNMOUNTING_SIGTERM:
855 return KILL_TERMINATE;
856
857 case MOUNT_REMOUNTING_SIGKILL:
858 case MOUNT_UNMOUNTING_SIGKILL:
859 return KILL_KILL;
860
861 default:
862 return _KILL_OPERATION_INVALID;
863 }
864 }
865
866 static void mount_enter_signal(Mount *m, MountState state, MountResult f) {
867 int r;
868
869 assert(m);
870
871 if (m->result == MOUNT_SUCCESS)
872 m->result = f;
873
874 r = unit_kill_context(
875 UNIT(m),
876 &m->kill_context,
877 state_to_kill_operation(state),
878 -1,
879 m->control_pid,
880 false);
881 if (r < 0)
882 goto fail;
883
884 if (r > 0) {
885 r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
886 if (r < 0)
887 goto fail;
888
889 mount_set_state(m, state);
890 } else if (state == MOUNT_REMOUNTING_SIGTERM && m->kill_context.send_sigkill)
891 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
892 else if (IN_SET(state, MOUNT_REMOUNTING_SIGTERM, MOUNT_REMOUNTING_SIGKILL))
893 mount_enter_mounted(m, MOUNT_SUCCESS);
894 else if (state == MOUNT_UNMOUNTING_SIGTERM && m->kill_context.send_sigkill)
895 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS);
896 else
897 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
898
899 return;
900
901 fail:
902 log_unit_warning_errno(UNIT(m), r, "Failed to kill processes: %m");
903 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
904 }
905
906 static void mount_enter_unmounting(Mount *m) {
907 int r;
908
909 assert(m);
910
911 /* Start counting our attempts */
912 if (!IN_SET(m->state,
913 MOUNT_UNMOUNTING,
914 MOUNT_UNMOUNTING_SIGTERM,
915 MOUNT_UNMOUNTING_SIGKILL))
916 m->n_retry_umount = 0;
917
918 m->control_command_id = MOUNT_EXEC_UNMOUNT;
919 m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
920
921 r = exec_command_set(m->control_command, UMOUNT_PATH, m->where, "-c", NULL);
922 if (r >= 0 && m->lazy_unmount)
923 r = exec_command_append(m->control_command, "-l", NULL);
924 if (r >= 0 && m->force_unmount)
925 r = exec_command_append(m->control_command, "-f", NULL);
926 if (r < 0)
927 goto fail;
928
929 mount_unwatch_control_pid(m);
930
931 r = mount_spawn(m, m->control_command, &m->control_pid);
932 if (r < 0)
933 goto fail;
934
935 mount_set_state(m, MOUNT_UNMOUNTING);
936
937 return;
938
939 fail:
940 log_unit_warning_errno(UNIT(m), r, "Failed to run 'umount' task: %m");
941 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
942 }
943
944 static void mount_enter_mounting(Mount *m) {
945 int r;
946 MountParameters *p;
947
948 assert(m);
949
950 r = unit_fail_if_noncanonical(UNIT(m), m->where);
951 if (r < 0)
952 goto fail;
953
954 (void) mkdir_p_label(m->where, m->directory_mode);
955
956 unit_warn_if_dir_nonempty(UNIT(m), m->where);
957 unit_warn_leftover_processes(UNIT(m));
958
959 m->control_command_id = MOUNT_EXEC_MOUNT;
960 m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
961
962 /* Create the source directory for bind-mounts if needed */
963 p = get_mount_parameters_fragment(m);
964 if (p && mount_is_bind(p))
965 (void) mkdir_p_label(p->what, m->directory_mode);
966
967 if (p) {
968 _cleanup_free_ char *opts = NULL;
969
970 r = fstab_filter_options(p->options, "nofail\0" "noauto\0" "auto\0", NULL, NULL, &opts);
971 if (r < 0)
972 goto fail;
973
974 r = exec_command_set(m->control_command, MOUNT_PATH, p->what, m->where, NULL);
975 if (r >= 0 && m->sloppy_options)
976 r = exec_command_append(m->control_command, "-s", NULL);
977 if (r >= 0 && p->fstype)
978 r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
979 if (r >= 0 && !isempty(opts))
980 r = exec_command_append(m->control_command, "-o", opts, NULL);
981 } else
982 r = -ENOENT;
983 if (r < 0)
984 goto fail;
985
986 mount_unwatch_control_pid(m);
987
988 r = mount_spawn(m, m->control_command, &m->control_pid);
989 if (r < 0)
990 goto fail;
991
992 mount_set_state(m, MOUNT_MOUNTING);
993
994 return;
995
996 fail:
997 log_unit_warning_errno(UNIT(m), r, "Failed to run 'mount' task: %m");
998 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
999 }
1000
1001 static void mount_set_reload_result(Mount *m, MountResult result) {
1002 assert(m);
1003
1004 /* Only store the first error we encounter */
1005 if (m->reload_result != MOUNT_SUCCESS)
1006 return;
1007
1008 m->reload_result = result;
1009 }
1010
1011 static void mount_enter_remounting(Mount *m) {
1012 int r;
1013 MountParameters *p;
1014
1015 assert(m);
1016
1017 /* Reset reload result when we are about to start a new remount operation */
1018 m->reload_result = MOUNT_SUCCESS;
1019
1020 m->control_command_id = MOUNT_EXEC_REMOUNT;
1021 m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
1022
1023 p = get_mount_parameters_fragment(m);
1024 if (p) {
1025 const char *o;
1026
1027 if (p->options)
1028 o = strjoina("remount,", p->options);
1029 else
1030 o = "remount";
1031
1032 r = exec_command_set(m->control_command, MOUNT_PATH,
1033 p->what, m->where,
1034 "-o", o, NULL);
1035 if (r >= 0 && m->sloppy_options)
1036 r = exec_command_append(m->control_command, "-s", NULL);
1037 if (r >= 0 && p->fstype)
1038 r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
1039 } else
1040 r = -ENOENT;
1041 if (r < 0)
1042 goto fail;
1043
1044 mount_unwatch_control_pid(m);
1045
1046 r = mount_spawn(m, m->control_command, &m->control_pid);
1047 if (r < 0)
1048 goto fail;
1049
1050 mount_set_state(m, MOUNT_REMOUNTING);
1051
1052 return;
1053
1054 fail:
1055 log_unit_warning_errno(UNIT(m), r, "Failed to run 'remount' task: %m");
1056 mount_set_reload_result(m, MOUNT_FAILURE_RESOURCES);
1057 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1058 }
1059
1060 static void mount_cycle_clear(Mount *m) {
1061 assert(m);
1062
1063 /* Clear all state we shall forget for this new cycle */
1064
1065 m->result = MOUNT_SUCCESS;
1066 m->reload_result = MOUNT_SUCCESS;
1067 exec_command_reset_status_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
1068 UNIT(m)->reset_accounting = true;
1069 }
1070
1071 static int mount_start(Unit *u) {
1072 Mount *m = MOUNT(u);
1073 int r;
1074
1075 assert(m);
1076
1077 /* We cannot fulfill this request right now, try again later
1078 * please! */
1079 if (IN_SET(m->state,
1080 MOUNT_UNMOUNTING,
1081 MOUNT_UNMOUNTING_SIGTERM,
1082 MOUNT_UNMOUNTING_SIGKILL))
1083 return -EAGAIN;
1084
1085 /* Already on it! */
1086 if (m->state == MOUNT_MOUNTING)
1087 return 0;
1088
1089 assert(IN_SET(m->state, MOUNT_DEAD, MOUNT_FAILED));
1090
1091 r = unit_start_limit_test(u);
1092 if (r < 0) {
1093 mount_enter_dead(m, MOUNT_FAILURE_START_LIMIT_HIT);
1094 return r;
1095 }
1096
1097 r = unit_acquire_invocation_id(u);
1098 if (r < 0)
1099 return r;
1100
1101 mount_cycle_clear(m);
1102 mount_enter_mounting(m);
1103
1104 return 1;
1105 }
1106
1107 static int mount_stop(Unit *u) {
1108 Mount *m = MOUNT(u);
1109
1110 assert(m);
1111
1112 switch (m->state) {
1113
1114 case MOUNT_UNMOUNTING:
1115 case MOUNT_UNMOUNTING_SIGKILL:
1116 case MOUNT_UNMOUNTING_SIGTERM:
1117 /* Already on it */
1118 return 0;
1119
1120 case MOUNT_MOUNTING:
1121 case MOUNT_MOUNTING_DONE:
1122 case MOUNT_REMOUNTING:
1123 /* If we are still waiting for /bin/mount, we go directly into kill mode. */
1124 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_SUCCESS);
1125 return 0;
1126
1127 case MOUNT_REMOUNTING_SIGTERM:
1128 /* If we are already waiting for a hung remount, convert this to the matching unmounting state */
1129 mount_set_state(m, MOUNT_UNMOUNTING_SIGTERM);
1130 return 0;
1131
1132 case MOUNT_REMOUNTING_SIGKILL:
1133 /* as above */
1134 mount_set_state(m, MOUNT_UNMOUNTING_SIGKILL);
1135 return 0;
1136
1137 case MOUNT_MOUNTED:
1138 mount_enter_unmounting(m);
1139 return 1;
1140
1141 default:
1142 assert_not_reached("Unexpected state.");
1143 }
1144 }
1145
1146 static int mount_reload(Unit *u) {
1147 Mount *m = MOUNT(u);
1148
1149 assert(m);
1150 assert(m->state == MOUNT_MOUNTED);
1151
1152 mount_enter_remounting(m);
1153
1154 return 1;
1155 }
1156
1157 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
1158 Mount *m = MOUNT(u);
1159
1160 assert(m);
1161 assert(f);
1162 assert(fds);
1163
1164 (void) serialize_item(f, "state", mount_state_to_string(m->state));
1165 (void) serialize_item(f, "result", mount_result_to_string(m->result));
1166 (void) serialize_item(f, "reload-result", mount_result_to_string(m->reload_result));
1167 (void) serialize_item_format(f, "n-retry-umount", "%u", m->n_retry_umount);
1168
1169 if (m->control_pid > 0)
1170 (void) serialize_item_format(f, "control-pid", PID_FMT, m->control_pid);
1171
1172 if (m->control_command_id >= 0)
1173 (void) serialize_item(f, "control-command", mount_exec_command_to_string(m->control_command_id));
1174
1175 return 0;
1176 }
1177
1178 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1179 Mount *m = MOUNT(u);
1180 int r;
1181
1182 assert(u);
1183 assert(key);
1184 assert(value);
1185 assert(fds);
1186
1187 if (streq(key, "state")) {
1188 MountState state;
1189
1190 if ((state = mount_state_from_string(value)) < 0)
1191 log_unit_debug(u, "Failed to parse state value: %s", value);
1192 else
1193 m->deserialized_state = state;
1194
1195 } else if (streq(key, "result")) {
1196 MountResult f;
1197
1198 f = mount_result_from_string(value);
1199 if (f < 0)
1200 log_unit_debug(u, "Failed to parse result value: %s", value);
1201 else if (f != MOUNT_SUCCESS)
1202 m->result = f;
1203
1204 } else if (streq(key, "reload-result")) {
1205 MountResult f;
1206
1207 f = mount_result_from_string(value);
1208 if (f < 0)
1209 log_unit_debug(u, "Failed to parse reload result value: %s", value);
1210 else if (f != MOUNT_SUCCESS)
1211 m->reload_result = f;
1212
1213 } else if (streq(key, "n-retry-umount")) {
1214
1215 r = safe_atou(value, &m->n_retry_umount);
1216 if (r < 0)
1217 log_unit_debug(u, "Failed to parse n-retry-umount value: %s", value);
1218
1219 } else if (streq(key, "control-pid")) {
1220
1221 if (parse_pid(value, &m->control_pid) < 0)
1222 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
1223
1224 } else if (streq(key, "control-command")) {
1225 MountExecCommand id;
1226
1227 id = mount_exec_command_from_string(value);
1228 if (id < 0)
1229 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
1230 else {
1231 m->control_command_id = id;
1232 m->control_command = m->exec_command + id;
1233 }
1234 } else
1235 log_unit_debug(u, "Unknown serialization key: %s", key);
1236
1237 return 0;
1238 }
1239
1240 _pure_ static UnitActiveState mount_active_state(Unit *u) {
1241 assert(u);
1242
1243 return state_translation_table[MOUNT(u)->state];
1244 }
1245
1246 _pure_ static const char *mount_sub_state_to_string(Unit *u) {
1247 assert(u);
1248
1249 return mount_state_to_string(MOUNT(u)->state);
1250 }
1251
1252 _pure_ static bool mount_may_gc(Unit *u) {
1253 Mount *m = MOUNT(u);
1254
1255 assert(m);
1256
1257 if (m->from_proc_self_mountinfo)
1258 return false;
1259
1260 return true;
1261 }
1262
1263 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1264 Mount *m = MOUNT(u);
1265 MountResult f;
1266
1267 assert(m);
1268 assert(pid >= 0);
1269
1270 if (pid != m->control_pid)
1271 return;
1272
1273 m->control_pid = 0;
1274
1275 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
1276 f = MOUNT_SUCCESS;
1277 else if (code == CLD_EXITED)
1278 f = MOUNT_FAILURE_EXIT_CODE;
1279 else if (code == CLD_KILLED)
1280 f = MOUNT_FAILURE_SIGNAL;
1281 else if (code == CLD_DUMPED)
1282 f = MOUNT_FAILURE_CORE_DUMP;
1283 else
1284 assert_not_reached("Unknown code");
1285
1286 if (IN_SET(m->state, MOUNT_REMOUNTING, MOUNT_REMOUNTING_SIGKILL, MOUNT_REMOUNTING_SIGTERM))
1287 mount_set_reload_result(m, f);
1288 else if (m->result == MOUNT_SUCCESS)
1289 m->result = f;
1290
1291 if (m->control_command) {
1292 exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status);
1293
1294 m->control_command = NULL;
1295 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1296 }
1297
1298 unit_log_process_exit(
1299 u, f == MOUNT_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
1300 "Mount process",
1301 mount_exec_command_to_string(m->control_command_id),
1302 code, status);
1303
1304 /* Note that due to the io event priority logic, we can be sure the new mountinfo is loaded
1305 * before we process the SIGCHLD for the mount command. */
1306
1307 switch (m->state) {
1308
1309 case MOUNT_MOUNTING:
1310 /* Our mount point has not appeared in mountinfo. Something went wrong. */
1311
1312 if (f == MOUNT_SUCCESS) {
1313 /* Either /bin/mount has an unexpected definition of success,
1314 * or someone raced us and we lost. */
1315 log_unit_warning(UNIT(m), "Mount process finished, but there is no mount.");
1316 f = MOUNT_FAILURE_PROTOCOL;
1317 }
1318 mount_enter_dead(m, f);
1319 break;
1320
1321 case MOUNT_MOUNTING_DONE:
1322 mount_enter_mounted(m, f);
1323 break;
1324
1325 case MOUNT_REMOUNTING:
1326 case MOUNT_REMOUNTING_SIGTERM:
1327 case MOUNT_REMOUNTING_SIGKILL:
1328 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1329 break;
1330
1331 case MOUNT_UNMOUNTING:
1332
1333 if (f == MOUNT_SUCCESS && m->from_proc_self_mountinfo) {
1334
1335 /* Still a mount point? If so, let's try again. Most likely there were multiple mount points
1336 * stacked on top of each other. We might exceed the timeout specified by the user overall,
1337 * but we will stop as soon as any one umount times out. */
1338
1339 if (m->n_retry_umount < RETRY_UMOUNT_MAX) {
1340 log_unit_debug(u, "Mount still present, trying again.");
1341 m->n_retry_umount++;
1342 mount_enter_unmounting(m);
1343 } else {
1344 log_unit_warning(u, "Mount still present after %u attempts to unmount, giving up.", m->n_retry_umount);
1345 mount_enter_mounted(m, f);
1346 }
1347 } else
1348 mount_enter_dead_or_mounted(m, f);
1349
1350 break;
1351
1352 case MOUNT_UNMOUNTING_SIGKILL:
1353 case MOUNT_UNMOUNTING_SIGTERM:
1354 mount_enter_dead_or_mounted(m, f);
1355 break;
1356
1357 default:
1358 assert_not_reached("Uh, control process died at wrong time.");
1359 }
1360
1361 /* Notify clients about changed exit status */
1362 unit_add_to_dbus_queue(u);
1363 }
1364
1365 static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
1366 Mount *m = MOUNT(userdata);
1367
1368 assert(m);
1369 assert(m->timer_event_source == source);
1370
1371 switch (m->state) {
1372
1373 case MOUNT_MOUNTING:
1374 case MOUNT_MOUNTING_DONE:
1375 log_unit_warning(UNIT(m), "Mounting timed out. Terminating.");
1376 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1377 break;
1378
1379 case MOUNT_REMOUNTING:
1380 log_unit_warning(UNIT(m), "Remounting timed out. Terminating remount process.");
1381 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1382 mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, MOUNT_SUCCESS);
1383 break;
1384
1385 case MOUNT_REMOUNTING_SIGTERM:
1386 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1387
1388 if (m->kill_context.send_sigkill) {
1389 log_unit_warning(UNIT(m), "Remounting timed out. Killing.");
1390 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
1391 } else {
1392 log_unit_warning(UNIT(m), "Remounting timed out. Skipping SIGKILL. Ignoring.");
1393 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1394 }
1395 break;
1396
1397 case MOUNT_REMOUNTING_SIGKILL:
1398 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1399
1400 log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
1401 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1402 break;
1403
1404 case MOUNT_UNMOUNTING:
1405 log_unit_warning(UNIT(m), "Unmounting timed out. Terminating.");
1406 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1407 break;
1408
1409 case MOUNT_UNMOUNTING_SIGTERM:
1410 if (m->kill_context.send_sigkill) {
1411 log_unit_warning(UNIT(m), "Mount process timed out. Killing.");
1412 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
1413 } else {
1414 log_unit_warning(UNIT(m), "Mount process timed out. Skipping SIGKILL. Ignoring.");
1415 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
1416 }
1417 break;
1418
1419 case MOUNT_UNMOUNTING_SIGKILL:
1420 log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
1421 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
1422 break;
1423
1424 default:
1425 assert_not_reached("Timeout at wrong time.");
1426 }
1427
1428 return 0;
1429 }
1430
1431 static int update_parameters_proc_self_mount_info(
1432 Mount *m,
1433 const char *what,
1434 const char *options,
1435 const char *fstype) {
1436
1437 MountParameters *p;
1438 int r, q, w;
1439
1440 p = &m->parameters_proc_self_mountinfo;
1441
1442 r = free_and_strdup(&p->what, what);
1443 if (r < 0)
1444 return r;
1445
1446 q = free_and_strdup(&p->options, options);
1447 if (q < 0)
1448 return q;
1449
1450 w = free_and_strdup(&p->fstype, fstype);
1451 if (w < 0)
1452 return w;
1453
1454 return r > 0 || q > 0 || w > 0;
1455 }
1456
1457 static int mount_setup_new_unit(
1458 Manager *m,
1459 const char *name,
1460 const char *what,
1461 const char *where,
1462 const char *options,
1463 const char *fstype,
1464 MountProcFlags *ret_flags,
1465 Unit **ret) {
1466
1467 _cleanup_(unit_freep) Unit *u = NULL;
1468 int r;
1469
1470 assert(m);
1471 assert(name);
1472 assert(ret_flags);
1473 assert(ret);
1474
1475 r = unit_new_for_name(m, sizeof(Mount), name, &u);
1476 if (r < 0)
1477 return r;
1478
1479 r = free_and_strdup(&u->source_path, "/proc/self/mountinfo");
1480 if (r < 0)
1481 return r;
1482
1483 r = free_and_strdup(&MOUNT(u)->where, where);
1484 if (r < 0)
1485 return r;
1486
1487 r = update_parameters_proc_self_mount_info(MOUNT(u), what, options, fstype);
1488 if (r < 0)
1489 return r;
1490
1491 /* This unit was generated because /proc/self/mountinfo reported it. Remember this, so that by the time we load
1492 * the unit file for it (and thus add in extra deps right after) we know what source to attributes the deps
1493 * to.*/
1494 MOUNT(u)->from_proc_self_mountinfo = true;
1495
1496 /* We have only allocated the stub now, let's enqueue this unit for loading now, so that everything else is
1497 * loaded in now. */
1498 unit_add_to_load_queue(u);
1499
1500 *ret_flags = MOUNT_PROC_IS_MOUNTED | MOUNT_PROC_JUST_MOUNTED | MOUNT_PROC_JUST_CHANGED;
1501 *ret = TAKE_PTR(u);
1502 return 0;
1503 }
1504
1505 static int mount_setup_existing_unit(
1506 Unit *u,
1507 const char *what,
1508 const char *where,
1509 const char *options,
1510 const char *fstype,
1511 MountProcFlags *ret_flags) {
1512
1513 MountProcFlags flags = MOUNT_PROC_IS_MOUNTED;
1514 int r;
1515
1516 assert(u);
1517 assert(flags);
1518
1519 if (!MOUNT(u)->where) {
1520 MOUNT(u)->where = strdup(where);
1521 if (!MOUNT(u)->where)
1522 return -ENOMEM;
1523 }
1524
1525 r = update_parameters_proc_self_mount_info(MOUNT(u), what, options, fstype);
1526 if (r < 0)
1527 return r;
1528 if (r > 0)
1529 flags |= MOUNT_PROC_JUST_CHANGED;
1530
1531 if (!MOUNT(u)->from_proc_self_mountinfo) {
1532 flags |= MOUNT_PROC_JUST_MOUNTED;
1533 MOUNT(u)->from_proc_self_mountinfo = true;
1534 }
1535
1536 if (IN_SET(u->load_state, UNIT_NOT_FOUND, UNIT_BAD_SETTING, UNIT_ERROR)) {
1537 /* The unit was previously not found or otherwise not loaded. Now that the unit shows up in
1538 * /proc/self/mountinfo we should reconsider it this, hence set it to UNIT_LOADED. */
1539 u->load_state = UNIT_LOADED;
1540 u->load_error = 0;
1541
1542 flags |= MOUNT_PROC_JUST_CHANGED;
1543 }
1544
1545 if (FLAGS_SET(flags, MOUNT_PROC_JUST_CHANGED)) {
1546 /* If things changed, then make sure that all deps are regenerated. Let's
1547 * first remove all automatic deps, and then add in the new ones. */
1548
1549 unit_remove_dependencies(u, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
1550
1551 r = mount_add_extras(MOUNT(u));
1552 if (r < 0)
1553 return r;
1554 }
1555
1556 *ret_flags = flags;
1557 return 0;
1558 }
1559
1560 static int mount_setup_unit(
1561 Manager *m,
1562 const char *what,
1563 const char *where,
1564 const char *options,
1565 const char *fstype,
1566 bool set_flags) {
1567
1568 _cleanup_free_ char *e = NULL;
1569 MountProcFlags flags;
1570 Unit *u;
1571 int r;
1572
1573 assert(m);
1574 assert(what);
1575 assert(where);
1576 assert(options);
1577 assert(fstype);
1578
1579 /* Ignore API mount points. They should never be referenced in
1580 * dependencies ever. */
1581 if (mount_point_is_api(where) || mount_point_ignore(where))
1582 return 0;
1583
1584 if (streq(fstype, "autofs"))
1585 return 0;
1586
1587 /* probably some kind of swap, ignore */
1588 if (!is_path(where))
1589 return 0;
1590
1591 r = unit_name_from_path(where, ".mount", &e);
1592 if (r < 0)
1593 return log_error_errno(r, "Failed to generate unit name from path '%s': %m", where);
1594
1595 u = manager_get_unit(m, e);
1596 if (u)
1597 r = mount_setup_existing_unit(u, what, where, options, fstype, &flags);
1598 else
1599 /* First time we see this mount point meaning that it's not been initiated by a mount unit but rather
1600 * by the sysadmin having called mount(8) directly. */
1601 r = mount_setup_new_unit(m, e, what, where, options, fstype, &flags, &u);
1602 if (r < 0)
1603 return log_warning_errno(r, "Failed to set up mount unit: %m");
1604
1605 /* If the mount changed properties or state, let's notify our clients */
1606 if (flags & (MOUNT_PROC_JUST_CHANGED|MOUNT_PROC_JUST_MOUNTED))
1607 unit_add_to_dbus_queue(u);
1608
1609 if (set_flags)
1610 MOUNT(u)->proc_flags = flags;
1611
1612 return 0;
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;
1619
1620 assert(m);
1621
1622 t = mnt_new_table();
1623 i = mnt_new_iter(MNT_ITER_FORWARD);
1624 if (!t || !i)
1625 return log_oom();
1626
1627 r = mnt_table_parse_mtab(t, NULL);
1628 if (r < 0)
1629 return log_error_errno(r, "Failed to parse /proc/self/mountinfo: %m");
1630
1631 for (;;) {
1632 struct libmnt_fs *fs;
1633 const char *device, *path, *options, *fstype;
1634 _cleanup_free_ char *d = NULL, *p = NULL;
1635 int k;
1636
1637 k = mnt_table_next_fs(t, i, &fs);
1638 if (k == 1)
1639 break;
1640 if (k < 0)
1641 return log_error_errno(k, "Failed to get next entry from /proc/self/mountinfo: %m");
1642
1643 device = mnt_fs_get_source(fs);
1644 path = mnt_fs_get_target(fs);
1645 options = mnt_fs_get_options(fs);
1646 fstype = mnt_fs_get_fstype(fs);
1647
1648 if (!device || !path)
1649 continue;
1650
1651 if (cunescape(device, UNESCAPE_RELAX, &d) < 0)
1652 return log_oom();
1653
1654 if (cunescape(path, UNESCAPE_RELAX, &p) < 0)
1655 return log_oom();
1656
1657 device_found_node(m, d, DEVICE_FOUND_MOUNT, DEVICE_FOUND_MOUNT);
1658
1659 (void) mount_setup_unit(m, d, p, options, fstype, set_flags);
1660 }
1661
1662 return 0;
1663 }
1664
1665 static void mount_shutdown(Manager *m) {
1666 assert(m);
1667
1668 m->mount_event_source = sd_event_source_unref(m->mount_event_source);
1669
1670 mnt_unref_monitor(m->mount_monitor);
1671 m->mount_monitor = NULL;
1672 }
1673
1674 static int mount_get_timeout(Unit *u, usec_t *timeout) {
1675 Mount *m = MOUNT(u);
1676 usec_t t;
1677 int r;
1678
1679 if (!m->timer_event_source)
1680 return 0;
1681
1682 r = sd_event_source_get_time(m->timer_event_source, &t);
1683 if (r < 0)
1684 return r;
1685 if (t == USEC_INFINITY)
1686 return 0;
1687
1688 *timeout = t;
1689 return 1;
1690 }
1691
1692 static void mount_enumerate_perpetual(Manager *m) {
1693 Unit *u;
1694 int r;
1695
1696 assert(m);
1697
1698 /* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's
1699 * unconditionally synthesize it here and mark it as perpetual. */
1700
1701 u = manager_get_unit(m, SPECIAL_ROOT_MOUNT);
1702 if (!u) {
1703 r = unit_new_for_name(m, sizeof(Mount), SPECIAL_ROOT_MOUNT, &u);
1704 if (r < 0) {
1705 log_error_errno(r, "Failed to allocate the special " SPECIAL_ROOT_MOUNT " unit: %m");
1706 return;
1707 }
1708 }
1709
1710 u->perpetual = true;
1711 MOUNT(u)->deserialized_state = MOUNT_MOUNTED;
1712
1713 unit_add_to_load_queue(u);
1714 unit_add_to_dbus_queue(u);
1715 }
1716
1717 static bool mount_is_mounted(Mount *m) {
1718 assert(m);
1719
1720 return UNIT(m)->perpetual || FLAGS_SET(m->proc_flags, MOUNT_PROC_IS_MOUNTED);
1721 }
1722
1723 static void mount_enumerate(Manager *m) {
1724 int r;
1725
1726 assert(m);
1727
1728 mnt_init_debug(0);
1729
1730 if (!m->mount_monitor) {
1731 int fd;
1732
1733 m->mount_monitor = mnt_new_monitor();
1734 if (!m->mount_monitor) {
1735 log_oom();
1736 goto fail;
1737 }
1738
1739 r = mnt_monitor_enable_kernel(m->mount_monitor, 1);
1740 if (r < 0) {
1741 log_error_errno(r, "Failed to enable watching of kernel mount events: %m");
1742 goto fail;
1743 }
1744
1745 r = mnt_monitor_enable_userspace(m->mount_monitor, 1, NULL);
1746 if (r < 0) {
1747 log_error_errno(r, "Failed to enable watching of userspace mount events: %m");
1748 goto fail;
1749 }
1750
1751 /* mnt_unref_monitor() will close the fd */
1752 fd = r = mnt_monitor_get_fd(m->mount_monitor);
1753 if (r < 0) {
1754 log_error_errno(r, "Failed to acquire watch file descriptor: %m");
1755 goto fail;
1756 }
1757
1758 r = sd_event_add_io(m->event, &m->mount_event_source, fd, EPOLLIN, mount_dispatch_io, m);
1759 if (r < 0) {
1760 log_error_errno(r, "Failed to watch mount file descriptor: %m");
1761 goto fail;
1762 }
1763
1764 r = sd_event_source_set_priority(m->mount_event_source, SD_EVENT_PRIORITY_NORMAL-10);
1765 if (r < 0) {
1766 log_error_errno(r, "Failed to adjust mount watch priority: %m");
1767 goto fail;
1768 }
1769
1770 (void) sd_event_source_set_description(m->mount_event_source, "mount-monitor-dispatch");
1771 }
1772
1773 r = mount_load_proc_self_mountinfo(m, false);
1774 if (r < 0)
1775 goto fail;
1776
1777 return;
1778
1779 fail:
1780 mount_shutdown(m);
1781 }
1782
1783 static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
1784 _cleanup_set_free_free_ Set *around = NULL, *gone = NULL;
1785 Manager *m = userdata;
1786 const char *what;
1787 Iterator i;
1788 Unit *u;
1789 int r;
1790
1791 assert(m);
1792 assert(revents & EPOLLIN);
1793
1794 if (fd == mnt_monitor_get_fd(m->mount_monitor)) {
1795 bool rescan = false;
1796
1797 /* Drain all events and verify that the event is valid.
1798 *
1799 * Note that libmount also monitors /run/mount mkdir if the
1800 * directory does not exist yet. The mkdir may generate event
1801 * which is irrelevant for us.
1802 *
1803 * error: r < 0; valid: r == 0, false positive: rc == 1 */
1804 do {
1805 r = mnt_monitor_next_change(m->mount_monitor, NULL, NULL);
1806 if (r == 0)
1807 rescan = true;
1808 else if (r < 0)
1809 return log_error_errno(r, "Failed to drain libmount events: %m");
1810 } while (r == 0);
1811
1812 log_debug("libmount event [rescan: %s]", yes_no(rescan));
1813 if (!rescan)
1814 return 0;
1815 }
1816
1817 r = mount_load_proc_self_mountinfo(m, true);
1818 if (r < 0) {
1819 /* Reset flags, just in case, for later calls */
1820 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT])
1821 MOUNT(u)->proc_flags = 0;
1822
1823 return 0;
1824 }
1825
1826 manager_dispatch_load_queue(m);
1827
1828 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1829 Mount *mount = MOUNT(u);
1830
1831 if (!mount_is_mounted(mount)) {
1832
1833 /* A mount point is not around right now. It
1834 * might be gone, or might never have
1835 * existed. */
1836
1837 if (mount->from_proc_self_mountinfo &&
1838 mount->parameters_proc_self_mountinfo.what) {
1839
1840 /* Remember that this device might just have disappeared */
1841 if (set_ensure_allocated(&gone, &path_hash_ops) < 0 ||
1842 set_put_strdup(gone, mount->parameters_proc_self_mountinfo.what) < 0)
1843 log_oom(); /* we don't care too much about OOM here... */
1844 }
1845
1846 mount->from_proc_self_mountinfo = false;
1847
1848 switch (mount->state) {
1849
1850 case MOUNT_MOUNTED:
1851 /* This has just been unmounted by somebody else, follow the state change. */
1852 mount_enter_dead(mount, MOUNT_SUCCESS);
1853 break;
1854
1855 default:
1856 break;
1857 }
1858
1859 } else if (mount->proc_flags & (MOUNT_PROC_JUST_MOUNTED|MOUNT_PROC_JUST_CHANGED)) {
1860
1861 /* A mount point was added or changed */
1862
1863 switch (mount->state) {
1864
1865 case MOUNT_DEAD:
1866 case MOUNT_FAILED:
1867
1868 /* This has just been mounted by somebody else, follow the state change, but let's
1869 * generate a new invocation ID for this implicitly and automatically. */
1870 (void) unit_acquire_invocation_id(u);
1871 mount_cycle_clear(mount);
1872 mount_enter_mounted(mount, MOUNT_SUCCESS);
1873 break;
1874
1875 case MOUNT_MOUNTING:
1876 mount_set_state(mount, MOUNT_MOUNTING_DONE);
1877 break;
1878
1879 default:
1880 /* Nothing really changed, but let's
1881 * issue an notification call
1882 * nonetheless, in case somebody is
1883 * waiting for this. (e.g. file system
1884 * ro/rw remounts.) */
1885 mount_set_state(mount, mount->state);
1886 break;
1887 }
1888 }
1889
1890 if (mount_is_mounted(mount) &&
1891 mount->from_proc_self_mountinfo &&
1892 mount->parameters_proc_self_mountinfo.what) {
1893 /* Track devices currently used */
1894
1895 if (set_ensure_allocated(&around, &path_hash_ops) < 0 ||
1896 set_put_strdup(around, mount->parameters_proc_self_mountinfo.what) < 0)
1897 log_oom();
1898 }
1899
1900 /* Reset the flags for later calls */
1901 mount->proc_flags = 0;
1902 }
1903
1904 SET_FOREACH(what, gone, i) {
1905 if (set_contains(around, what))
1906 continue;
1907
1908 /* Let the device units know that the device is no longer mounted */
1909 device_found_node(m, what, 0, DEVICE_FOUND_MOUNT);
1910 }
1911
1912 return 0;
1913 }
1914
1915 static void mount_reset_failed(Unit *u) {
1916 Mount *m = MOUNT(u);
1917
1918 assert(m);
1919
1920 if (m->state == MOUNT_FAILED)
1921 mount_set_state(m, MOUNT_DEAD);
1922
1923 m->result = MOUNT_SUCCESS;
1924 m->reload_result = MOUNT_SUCCESS;
1925 }
1926
1927 static int mount_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
1928 Mount *m = MOUNT(u);
1929
1930 assert(m);
1931
1932 return unit_kill_common(u, who, signo, -1, MOUNT(u)->control_pid, error);
1933 }
1934
1935 static int mount_control_pid(Unit *u) {
1936 Mount *m = MOUNT(u);
1937
1938 assert(m);
1939
1940 return m->control_pid;
1941 }
1942
1943 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1944 [MOUNT_EXEC_MOUNT] = "ExecMount",
1945 [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1946 [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1947 };
1948
1949 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1950
1951 static const char* const mount_result_table[_MOUNT_RESULT_MAX] = {
1952 [MOUNT_SUCCESS] = "success",
1953 [MOUNT_FAILURE_RESOURCES] = "resources",
1954 [MOUNT_FAILURE_TIMEOUT] = "timeout",
1955 [MOUNT_FAILURE_EXIT_CODE] = "exit-code",
1956 [MOUNT_FAILURE_SIGNAL] = "signal",
1957 [MOUNT_FAILURE_CORE_DUMP] = "core-dump",
1958 [MOUNT_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
1959 [MOUNT_FAILURE_PROTOCOL] = "protocol",
1960 };
1961
1962 DEFINE_STRING_TABLE_LOOKUP(mount_result, MountResult);
1963
1964 const UnitVTable mount_vtable = {
1965 .object_size = sizeof(Mount),
1966 .exec_context_offset = offsetof(Mount, exec_context),
1967 .cgroup_context_offset = offsetof(Mount, cgroup_context),
1968 .kill_context_offset = offsetof(Mount, kill_context),
1969 .exec_runtime_offset = offsetof(Mount, exec_runtime),
1970 .dynamic_creds_offset = offsetof(Mount, dynamic_creds),
1971
1972 .sections =
1973 "Unit\0"
1974 "Mount\0"
1975 "Install\0",
1976 .private_section = "Mount",
1977
1978 .init = mount_init,
1979 .load = mount_load,
1980 .done = mount_done,
1981
1982 .coldplug = mount_coldplug,
1983
1984 .dump = mount_dump,
1985
1986 .start = mount_start,
1987 .stop = mount_stop,
1988 .reload = mount_reload,
1989
1990 .kill = mount_kill,
1991
1992 .serialize = mount_serialize,
1993 .deserialize_item = mount_deserialize_item,
1994
1995 .active_state = mount_active_state,
1996 .sub_state_to_string = mount_sub_state_to_string,
1997
1998 .may_gc = mount_may_gc,
1999
2000 .sigchld_event = mount_sigchld_event,
2001
2002 .reset_failed = mount_reset_failed,
2003
2004 .control_pid = mount_control_pid,
2005
2006 .bus_vtable = bus_mount_vtable,
2007 .bus_set_property = bus_mount_set_property,
2008 .bus_commit_properties = bus_mount_commit_properties,
2009
2010 .get_timeout = mount_get_timeout,
2011
2012 .can_transient = true,
2013
2014 .enumerate_perpetual = mount_enumerate_perpetual,
2015 .enumerate = mount_enumerate,
2016 .shutdown = mount_shutdown,
2017
2018 .status_message_formats = {
2019 .starting_stopping = {
2020 [0] = "Mounting %s...",
2021 [1] = "Unmounting %s...",
2022 },
2023 .finished_start_job = {
2024 [JOB_DONE] = "Mounted %s.",
2025 [JOB_FAILED] = "Failed to mount %s.",
2026 [JOB_TIMEOUT] = "Timed out mounting %s.",
2027 },
2028 .finished_stop_job = {
2029 [JOB_DONE] = "Unmounted %s.",
2030 [JOB_FAILED] = "Failed unmounting %s.",
2031 [JOB_TIMEOUT] = "Timed out unmounting %s.",
2032 },
2033 },
2034 };
Unnamed repository; edit this file 'description' to name the repository.