]> git.ipfire.org Git - thirdparty/systemd.git/blob - src/core/mount.c
projects / thirdparty / systemd.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge pull request #16603 from benzea/benzea/special-app-slice
[thirdparty/systemd.git] / src / core / mount.c
1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3 #include <errno.h>
4 #include <signal.h>
5 #include <stdio.h>
6 #include <sys/epoll.h>
7
8 #include "sd-messages.h"
9
10 #include "alloc-util.h"
11 #include "dbus-mount.h"
12 #include "dbus-unit.h"
13 #include "device.h"
14 #include "exit-status.h"
15 #include "format-util.h"
16 #include "fstab-util.h"
17 #include "libmount-util.h"
18 #include "log.h"
19 #include "manager.h"
20 #include "mkdir.h"
21 #include "mount-setup.h"
22 #include "mount.h"
23 #include "mountpoint-util.h"
24 #include "parse-util.h"
25 #include "path-util.h"
26 #include "process-util.h"
27 #include "serialize.h"
28 #include "special.h"
29 #include "string-table.h"
30 #include "string-util.h"
31 #include "strv.h"
32 #include "unit-name.h"
33 #include "unit.h"
34
35 #define RETRY_UMOUNT_MAX 32
36
37 static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
38 [MOUNT_DEAD] = UNIT_INACTIVE,
39 [MOUNT_MOUNTING] = UNIT_ACTIVATING,
40 [MOUNT_MOUNTING_DONE] = UNIT_ACTIVATING,
41 [MOUNT_MOUNTED] = UNIT_ACTIVE,
42 [MOUNT_REMOUNTING] = UNIT_RELOADING,
43 [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
44 [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING,
45 [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING,
46 [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
47 [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
48 [MOUNT_FAILED] = UNIT_FAILED,
49 [MOUNT_CLEANING] = UNIT_MAINTENANCE,
50 };
51
52 static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
53 static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
54 static int mount_process_proc_self_mountinfo(Manager *m);
55
56 static bool MOUNT_STATE_WITH_PROCESS(MountState state) {
57 return IN_SET(state,
58 MOUNT_MOUNTING,
59 MOUNT_MOUNTING_DONE,
60 MOUNT_REMOUNTING,
61 MOUNT_REMOUNTING_SIGTERM,
62 MOUNT_REMOUNTING_SIGKILL,
63 MOUNT_UNMOUNTING,
64 MOUNT_UNMOUNTING_SIGTERM,
65 MOUNT_UNMOUNTING_SIGKILL,
66 MOUNT_CLEANING);
67 }
68
69 static bool mount_is_automount(const MountParameters *p) {
70 assert(p);
71
72 return fstab_test_option(p->options,
73 "comment=systemd.automount\0"
74 "x-systemd.automount\0");
75 }
76
77 static bool mount_is_network(const MountParameters *p) {
78 assert(p);
79
80 if (fstab_test_option(p->options, "_netdev\0"))
81 return true;
82
83 if (p->fstype && fstype_is_network(p->fstype))
84 return true;
85
86 return false;
87 }
88
89 static bool mount_is_nofail(const Mount *m) {
90 assert(m);
91
92 if (!m->from_fragment)
93 return false;
94
95 return fstab_test_yes_no_option(m->parameters_fragment.options, "nofail\0" "fail\0");
96 }
97
98 static bool mount_is_loop(const MountParameters *p) {
99 assert(p);
100
101 if (fstab_test_option(p->options, "loop\0"))
102 return true;
103
104 return false;
105 }
106
107 static bool mount_is_bind(const MountParameters *p) {
108 assert(p);
109
110 if (fstab_test_option(p->options, "bind\0" "rbind\0"))
111 return true;
112
113 if (p->fstype && STR_IN_SET(p->fstype, "bind", "rbind"))
114 return true;
115
116 return false;
117 }
118
119 static bool mount_is_bound_to_device(const Mount *m) {
120 const MountParameters *p;
121
122 if (m->from_fragment)
123 return true;
124
125 p = &m->parameters_proc_self_mountinfo;
126 return fstab_test_option(p->options, "x-systemd.device-bound\0");
127 }
128
129 static bool mount_needs_quota(const MountParameters *p) {
130 assert(p);
131
132 /* Quotas are not enabled on network filesystems, but we want them, for example, on storage connected via
133 * iscsi. We hence don't use mount_is_network() here, as that would also return true for _netdev devices. */
134 if (p->fstype && fstype_is_network(p->fstype))
135 return false;
136
137 if (mount_is_bind(p))
138 return false;
139
140 return fstab_test_option(p->options,
141 "usrquota\0" "grpquota\0" "quota\0" "usrjquota\0" "grpjquota\0");
142 }
143
144 static void mount_init(Unit *u) {
145 Mount *m = MOUNT(u);
146
147 assert(u);
148 assert(u->load_state == UNIT_STUB);
149
150 m->timeout_usec = u->manager->default_timeout_start_usec;
151
152 m->exec_context.std_output = u->manager->default_std_output;
153 m->exec_context.std_error = u->manager->default_std_error;
154
155 m->directory_mode = 0755;
156
157 /* We need to make sure that /usr/bin/mount is always called
158 * in the same process group as us, so that the autofs kernel
159 * side doesn't send us another mount request while we are
160 * already trying to comply its last one. */
161 m->exec_context.same_pgrp = true;
162
163 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
164
165 u->ignore_on_isolate = true;
166 }
167
168 static int mount_arm_timer(Mount *m, usec_t usec) {
169 int r;
170
171 assert(m);
172
173 if (m->timer_event_source) {
174 r = sd_event_source_set_time(m->timer_event_source, usec);
175 if (r < 0)
176 return r;
177
178 return sd_event_source_set_enabled(m->timer_event_source, SD_EVENT_ONESHOT);
179 }
180
181 if (usec == USEC_INFINITY)
182 return 0;
183
184 r = sd_event_add_time(
185 UNIT(m)->manager->event,
186 &m->timer_event_source,
187 CLOCK_MONOTONIC,
188 usec, 0,
189 mount_dispatch_timer, m);
190 if (r < 0)
191 return r;
192
193 (void) sd_event_source_set_description(m->timer_event_source, "mount-timer");
194
195 return 0;
196 }
197
198 static void mount_unwatch_control_pid(Mount *m) {
199 assert(m);
200
201 if (m->control_pid <= 0)
202 return;
203
204 unit_unwatch_pid(UNIT(m), m->control_pid);
205 m->control_pid = 0;
206 }
207
208 static void mount_parameters_done(MountParameters *p) {
209 assert(p);
210
211 p->what = mfree(p->what);
212 p->options = mfree(p->options);
213 p->fstype = mfree(p->fstype);
214 }
215
216 static void mount_done(Unit *u) {
217 Mount *m = MOUNT(u);
218
219 assert(m);
220
221 m->where = mfree(m->where);
222
223 mount_parameters_done(&m->parameters_proc_self_mountinfo);
224 mount_parameters_done(&m->parameters_fragment);
225
226 m->exec_runtime = exec_runtime_unref(m->exec_runtime, false);
227 exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
228 m->control_command = NULL;
229
230 dynamic_creds_unref(&m->dynamic_creds);
231
232 mount_unwatch_control_pid(m);
233
234 m->timer_event_source = sd_event_source_unref(m->timer_event_source);
235 }
236
237 static MountParameters* get_mount_parameters_fragment(Mount *m) {
238 assert(m);
239
240 if (m->from_fragment)
241 return &m->parameters_fragment;
242
243 return NULL;
244 }
245
246 static MountParameters* get_mount_parameters(Mount *m) {
247 assert(m);
248
249 if (m->from_proc_self_mountinfo)
250 return &m->parameters_proc_self_mountinfo;
251
252 return get_mount_parameters_fragment(m);
253 }
254
255 static int update_parameters_proc_self_mountinfo(
256 Mount *m,
257 const char *what,
258 const char *options,
259 const char *fstype) {
260
261 MountParameters *p;
262 int r, q, w;
263
264 p = &m->parameters_proc_self_mountinfo;
265
266 r = free_and_strdup(&p->what, what);
267 if (r < 0)
268 return r;
269
270 q = free_and_strdup(&p->options, options);
271 if (q < 0)
272 return q;
273
274 w = free_and_strdup(&p->fstype, fstype);
275 if (w < 0)
276 return w;
277
278 return r > 0 || q > 0 || w > 0;
279 }
280
281 static int mount_add_mount_dependencies(Mount *m) {
282 MountParameters *pm;
283 Unit *other;
284 Set *s;
285 int r;
286
287 assert(m);
288
289 if (!path_equal(m->where, "/")) {
290 _cleanup_free_ char *parent = NULL;
291
292 /* Adds in links to other mount points that might lie further up in the hierarchy */
293
294 parent = dirname_malloc(m->where);
295 if (!parent)
296 return -ENOMEM;
297
298 r = unit_require_mounts_for(UNIT(m), parent, UNIT_DEPENDENCY_IMPLICIT);
299 if (r < 0)
300 return r;
301 }
302
303 /* Adds in dependencies to other mount points that might be needed for the source path (if this is a bind mount
304 * or a loop mount) to be available. */
305 pm = get_mount_parameters_fragment(m);
306 if (pm && pm->what &&
307 path_is_absolute(pm->what) &&
308 (mount_is_bind(pm) || mount_is_loop(pm) || !mount_is_network(pm))) {
309
310 r = unit_require_mounts_for(UNIT(m), pm->what, UNIT_DEPENDENCY_FILE);
311 if (r < 0)
312 return r;
313 }
314
315 /* Adds in dependencies to other units that use this path or paths further down in the hierarchy */
316 s = manager_get_units_requiring_mounts_for(UNIT(m)->manager, m->where);
317 SET_FOREACH(other, s) {
318
319 if (other->load_state != UNIT_LOADED)
320 continue;
321
322 if (other == UNIT(m))
323 continue;
324
325 r = unit_add_dependency(other, UNIT_AFTER, UNIT(m), true, UNIT_DEPENDENCY_PATH);
326 if (r < 0)
327 return r;
328
329 if (UNIT(m)->fragment_path) {
330 /* If we have fragment configuration, then make this dependency required */
331 r = unit_add_dependency(other, UNIT_REQUIRES, UNIT(m), true, UNIT_DEPENDENCY_PATH);
332 if (r < 0)
333 return r;
334 }
335 }
336
337 return 0;
338 }
339
340 static int mount_add_device_dependencies(Mount *m) {
341 UnitDependencyMask mask;
342 MountParameters *p;
343 UnitDependency dep;
344 int r;
345
346 assert(m);
347
348 p = get_mount_parameters(m);
349 if (!p)
350 return 0;
351
352 if (!p->what)
353 return 0;
354
355 if (mount_is_bind(p))
356 return 0;
357
358 if (!is_device_path(p->what))
359 return 0;
360
361 /* /dev/root is a really weird thing, it's not a real device, but just a path the kernel exports for
362 * the root file system specified on the kernel command line. Ignore it here. */
363 if (PATH_IN_SET(p->what, "/dev/root", "/dev/nfs"))
364 return 0;
365
366 if (path_equal(m->where, "/"))
367 return 0;
368
369 /* Mount units from /proc/self/mountinfo are not bound to devices by default since they're subject to
370 * races when devices are unplugged. But the user can still force this dep with an appropriate option
371 * (or udev property) so the mount units are automatically stopped when the device disappears
372 * suddenly. */
373 dep = mount_is_bound_to_device(m) ? UNIT_BINDS_TO : UNIT_REQUIRES;
374
375 /* We always use 'what' from /proc/self/mountinfo if mounted */
376 mask = m->from_proc_self_mountinfo ? UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT : UNIT_DEPENDENCY_FILE;
377
378 r = unit_add_node_dependency(UNIT(m), p->what, dep, mask);
379 if (r < 0)
380 return r;
381
382 return unit_add_blockdev_dependency(UNIT(m), p->what, mask);
383 }
384
385 static int mount_add_quota_dependencies(Mount *m) {
386 UnitDependencyMask mask;
387 MountParameters *p;
388 int r;
389
390 assert(m);
391
392 if (!MANAGER_IS_SYSTEM(UNIT(m)->manager))
393 return 0;
394
395 p = get_mount_parameters_fragment(m);
396 if (!p)
397 return 0;
398
399 if (!mount_needs_quota(p))
400 return 0;
401
402 mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT;
403
404 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, true, mask);
405 if (r < 0)
406 return r;
407
408 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, true, mask);
409 if (r < 0)
410 return r;
411
412 return 0;
413 }
414
415 static bool mount_is_extrinsic(Unit *u) {
416 MountParameters *p;
417 Mount *m = MOUNT(u);
418 assert(m);
419
420 /* Returns true for all units that are "magic" and should be excluded from the usual
421 * start-up and shutdown dependencies. We call them "extrinsic" here, as they are generally
422 * mounted outside of the systemd dependency logic. We shouldn't attempt to manage them
423 * ourselves but it's fine if the user operates on them with us. */
424
425 /* We only automatically manage mounts if we are in system mode */
426 if (MANAGER_IS_USER(u->manager))
427 return true;
428
429 p = get_mount_parameters(m);
430 if (p && fstab_is_extrinsic(m->where, p->options))
431 return true;
432
433 return false;
434 }
435
436 static int mount_add_default_ordering_dependencies(
437 Mount *m,
438 MountParameters *p,
439 UnitDependencyMask mask) {
440
441 const char *after, *before, *e;
442 int r;
443
444 assert(m);
445
446 e = path_startswith(m->where, "/sysroot");
447 if (e && in_initrd()) {
448 /* All mounts under /sysroot need to happen later, at initrd-fs.target time. IOW,
449 * it's not technically part of the basic initrd filesystem itself, and so
450 * shouldn't inherit the default Before=local-fs.target dependency. */
451
452 after = NULL;
453 before = isempty(e) ? SPECIAL_INITRD_ROOT_FS_TARGET : SPECIAL_INITRD_FS_TARGET;
454
455 } else if (mount_is_network(p)) {
456 after = SPECIAL_REMOTE_FS_PRE_TARGET;
457 before = SPECIAL_REMOTE_FS_TARGET;
458
459 } else {
460 after = SPECIAL_LOCAL_FS_PRE_TARGET;
461 before = SPECIAL_LOCAL_FS_TARGET;
462 }
463
464 if (!mount_is_nofail(m) && !mount_is_automount(p)) {
465 r = unit_add_dependency_by_name(UNIT(m), UNIT_BEFORE, before, true, mask);
466 if (r < 0)
467 return r;
468 }
469
470 if (after) {
471 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, true, mask);
472 if (r < 0)
473 return r;
474 }
475
476 return unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS,
477 SPECIAL_UMOUNT_TARGET, true, mask);
478 }
479
480 static int mount_add_default_dependencies(Mount *m) {
481 UnitDependencyMask mask;
482 MountParameters *p;
483 int r;
484
485 assert(m);
486
487 if (!UNIT(m)->default_dependencies)
488 return 0;
489
490 /* We do not add any default dependencies to /, /usr or /run/initramfs/, since they are
491 * guaranteed to stay mounted the whole time, since our system is on it. Also, don't
492 * bother with anything mounted below virtual file systems, it's also going to be virtual,
493 * and hence not worth the effort. */
494 if (mount_is_extrinsic(UNIT(m)))
495 return 0;
496
497 p = get_mount_parameters(m);
498 if (!p)
499 return 0;
500
501 mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_DEFAULT;
502
503 r = mount_add_default_ordering_dependencies(m, p, mask);
504 if (r < 0)
505 return r;
506
507 if (mount_is_network(p)) {
508 /* We order ourselves after network.target. This is primarily useful at shutdown:
509 * services that take down the network should order themselves before
510 * network.target, so that they are shut down only after this mount unit is
511 * stopped. */
512
513 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_NETWORK_TARGET, true, mask);
514 if (r < 0)
515 return r;
516
517 /* We pull in network-online.target, and order ourselves after it. This is useful
518 * at start-up to actively pull in tools that want to be started before we start
519 * mounting network file systems, and whose purpose it is to delay this until the
520 * network is "up". */
521
522 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_WANTS, UNIT_AFTER, SPECIAL_NETWORK_ONLINE_TARGET, true, mask);
523 if (r < 0)
524 return r;
525 }
526
527 /* If this is a tmpfs mount then we have to unmount it before we try to deactivate swaps */
528 if (streq_ptr(p->fstype, "tmpfs")) {
529 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_SWAP_TARGET, true, mask);
530 if (r < 0)
531 return r;
532 }
533
534 return 0;
535 }
536
537 static int mount_verify(Mount *m) {
538 _cleanup_free_ char *e = NULL;
539 MountParameters *p;
540 int r;
541
542 assert(m);
543 assert(UNIT(m)->load_state == UNIT_LOADED);
544
545 if (!m->from_fragment && !m->from_proc_self_mountinfo && !UNIT(m)->perpetual)
546 return -ENOENT;
547
548 r = unit_name_from_path(m->where, ".mount", &e);
549 if (r < 0)
550 return log_unit_error_errno(UNIT(m), r, "Failed to generate unit name from mount path: %m");
551
552 if (!unit_has_name(UNIT(m), e)) {
553 log_unit_error(UNIT(m), "Where= setting doesn't match unit name. Refusing.");
554 return -ENOEXEC;
555 }
556
557 if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
558 log_unit_error(UNIT(m), "Cannot create mount unit for API file system %s. Refusing.", m->where);
559 return -ENOEXEC;
560 }
561
562 p = get_mount_parameters_fragment(m);
563 if (p && !p->what && !UNIT(m)->perpetual)
564 return log_unit_error_errno(UNIT(m), SYNTHETIC_ERRNO(ENOEXEC),
565 "What= setting is missing. Refusing.");
566
567 if (m->exec_context.pam_name && m->kill_context.kill_mode != KILL_CONTROL_GROUP) {
568 log_unit_error(UNIT(m), "Unit has PAM enabled. Kill mode must be set to control-group'. Refusing.");
569 return -ENOEXEC;
570 }
571
572 return 0;
573 }
574
575 static int mount_add_non_exec_dependencies(Mount *m) {
576 int r;
577 assert(m);
578
579 /* Adds in all dependencies directly responsible for ordering the mount, as opposed to dependencies
580 * resulting from the ExecContext and such. */
581
582 r = mount_add_device_dependencies(m);
583 if (r < 0)
584 return r;
585
586 r = mount_add_mount_dependencies(m);
587 if (r < 0)
588 return r;
589
590 r = mount_add_quota_dependencies(m);
591 if (r < 0)
592 return r;
593
594 r = mount_add_default_dependencies(m);
595 if (r < 0)
596 return r;
597
598 return 0;
599 }
600
601 static int mount_add_extras(Mount *m) {
602 Unit *u = UNIT(m);
603 int r;
604
605 assert(m);
606
607 /* Note: this call might be called after we already have been loaded once (and even when it has already been
608 * activated), in case data from /proc/self/mountinfo has changed. This means all code here needs to be ready
609 * to run with an already set up unit. */
610
611 if (u->fragment_path)
612 m->from_fragment = true;
613
614 if (!m->where) {
615 r = unit_name_to_path(u->id, &m->where);
616 if (r < 0)
617 return r;
618 }
619
620 path_simplify(m->where, false);
621
622 if (!u->description) {
623 r = unit_set_description(u, m->where);
624 if (r < 0)
625 return r;
626 }
627
628 r = unit_patch_contexts(u);
629 if (r < 0)
630 return r;
631
632 r = unit_add_exec_dependencies(u, &m->exec_context);
633 if (r < 0)
634 return r;
635
636 r = unit_set_default_slice(u);
637 if (r < 0)
638 return r;
639
640 r = mount_add_non_exec_dependencies(m);
641 if (r < 0)
642 return r;
643
644 return 0;
645 }
646
647 static void mount_load_root_mount(Unit *u) {
648 assert(u);
649
650 if (!unit_has_name(u, SPECIAL_ROOT_MOUNT))
651 return;
652
653 u->perpetual = true;
654 u->default_dependencies = false;
655
656 /* The stdio/kmsg bridge socket is on /, in order to avoid a dep loop, don't use kmsg logging for -.mount */
657 MOUNT(u)->exec_context.std_output = EXEC_OUTPUT_NULL;
658 MOUNT(u)->exec_context.std_input = EXEC_INPUT_NULL;
659
660 if (!u->description)
661 u->description = strdup("Root Mount");
662 }
663
664 static int mount_load(Unit *u) {
665 Mount *m = MOUNT(u);
666 int r, q = 0;
667
668 assert(u);
669 assert(u->load_state == UNIT_STUB);
670
671 mount_load_root_mount(u);
672
673 bool fragment_optional = m->from_proc_self_mountinfo || u->perpetual;
674 r = unit_load_fragment_and_dropin(u, !fragment_optional);
675
676 /* Add in some extras. Note we do this in all cases (even if we failed to load the unit) when announced by the
677 * kernel, because we need some things to be set up no matter what when the kernel establishes a mount and thus
678 * we need to update the state in our unit to track it. After all, consider that we don't allow changing the
679 * 'slice' field for a unit once it is active. */
680 if (u->load_state == UNIT_LOADED || m->from_proc_self_mountinfo || u->perpetual)
681 q = mount_add_extras(m);
682
683 if (r < 0)
684 return r;
685 if (q < 0)
686 return q;
687 if (u->load_state != UNIT_LOADED)
688 return 0;
689
690 return mount_verify(m);
691 }
692
693 static void mount_set_state(Mount *m, MountState state) {
694 MountState old_state;
695 assert(m);
696
697 if (m->state != state)
698 bus_unit_send_pending_change_signal(UNIT(m), false);
699
700 old_state = m->state;
701 m->state = state;
702
703 if (!MOUNT_STATE_WITH_PROCESS(state)) {
704 m->timer_event_source = sd_event_source_unref(m->timer_event_source);
705 mount_unwatch_control_pid(m);
706 m->control_command = NULL;
707 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
708 }
709
710 if (state != old_state)
711 log_unit_debug(UNIT(m), "Changed %s -> %s", mount_state_to_string(old_state), mount_state_to_string(state));
712
713 unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state],
714 m->reload_result == MOUNT_SUCCESS ? 0 : UNIT_NOTIFY_RELOAD_FAILURE);
715 }
716
717 static int mount_coldplug(Unit *u) {
718 Mount *m = MOUNT(u);
719 MountState new_state = MOUNT_DEAD;
720 int r;
721
722 assert(m);
723 assert(m->state == MOUNT_DEAD);
724
725 if (m->deserialized_state != m->state)
726 new_state = m->deserialized_state;
727 else if (m->from_proc_self_mountinfo)
728 new_state = MOUNT_MOUNTED;
729
730 if (new_state == m->state)
731 return 0;
732
733 if (m->control_pid > 0 &&
734 pid_is_unwaited(m->control_pid) &&
735 MOUNT_STATE_WITH_PROCESS(new_state)) {
736
737 r = unit_watch_pid(UNIT(m), m->control_pid, false);
738 if (r < 0)
739 return r;
740
741 r = mount_arm_timer(m, usec_add(u->state_change_timestamp.monotonic, m->timeout_usec));
742 if (r < 0)
743 return r;
744 }
745
746 if (!IN_SET(new_state, MOUNT_DEAD, MOUNT_FAILED)) {
747 (void) unit_setup_dynamic_creds(u);
748 (void) unit_setup_exec_runtime(u);
749 }
750
751 mount_set_state(m, new_state);
752 return 0;
753 }
754
755 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
756 char buf[FORMAT_TIMESPAN_MAX];
757 Mount *m = MOUNT(u);
758 MountParameters *p;
759
760 assert(m);
761 assert(f);
762
763 p = get_mount_parameters(m);
764
765 fprintf(f,
766 "%sMount State: %s\n"
767 "%sResult: %s\n"
768 "%sClean Result: %s\n"
769 "%sWhere: %s\n"
770 "%sWhat: %s\n"
771 "%sFile System Type: %s\n"
772 "%sOptions: %s\n"
773 "%sFrom /proc/self/mountinfo: %s\n"
774 "%sFrom fragment: %s\n"
775 "%sExtrinsic: %s\n"
776 "%sDirectoryMode: %04o\n"
777 "%sSloppyOptions: %s\n"
778 "%sLazyUnmount: %s\n"
779 "%sForceUnmount: %s\n"
780 "%sReadWriteOnly: %s\n"
781 "%sTimeoutSec: %s\n",
782 prefix, mount_state_to_string(m->state),
783 prefix, mount_result_to_string(m->result),
784 prefix, mount_result_to_string(m->clean_result),
785 prefix, m->where,
786 prefix, p ? strna(p->what) : "n/a",
787 prefix, p ? strna(p->fstype) : "n/a",
788 prefix, p ? strna(p->options) : "n/a",
789 prefix, yes_no(m->from_proc_self_mountinfo),
790 prefix, yes_no(m->from_fragment),
791 prefix, yes_no(mount_is_extrinsic(u)),
792 prefix, m->directory_mode,
793 prefix, yes_no(m->sloppy_options),
794 prefix, yes_no(m->lazy_unmount),
795 prefix, yes_no(m->force_unmount),
796 prefix, yes_no(m->read_write_only),
797 prefix, format_timespan(buf, sizeof(buf), m->timeout_usec, USEC_PER_SEC));
798
799 if (m->control_pid > 0)
800 fprintf(f,
801 "%sControl PID: "PID_FMT"\n",
802 prefix, m->control_pid);
803
804 exec_context_dump(&m->exec_context, f, prefix);
805 kill_context_dump(&m->kill_context, f, prefix);
806 cgroup_context_dump(UNIT(m), f, prefix);
807 }
808
809 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
810
811 _cleanup_(exec_params_clear) ExecParameters exec_params = {
812 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
813 .stdin_fd = -1,
814 .stdout_fd = -1,
815 .stderr_fd = -1,
816 .exec_fd = -1,
817 };
818 pid_t pid;
819 int r;
820
821 assert(m);
822 assert(c);
823 assert(_pid);
824
825 r = unit_prepare_exec(UNIT(m));
826 if (r < 0)
827 return r;
828
829 r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
830 if (r < 0)
831 return r;
832
833 r = unit_set_exec_params(UNIT(m), &exec_params);
834 if (r < 0)
835 return r;
836
837 r = exec_spawn(UNIT(m),
838 c,
839 &m->exec_context,
840 &exec_params,
841 m->exec_runtime,
842 &m->dynamic_creds,
843 &pid);
844 if (r < 0)
845 return r;
846
847 r = unit_watch_pid(UNIT(m), pid, true);
848 if (r < 0)
849 return r;
850
851 *_pid = pid;
852
853 return 0;
854 }
855
856 static void mount_enter_dead(Mount *m, MountResult f) {
857 assert(m);
858
859 if (m->result == MOUNT_SUCCESS)
860 m->result = f;
861
862 unit_log_result(UNIT(m), m->result == MOUNT_SUCCESS, mount_result_to_string(m->result));
863 unit_warn_leftover_processes(UNIT(m), unit_log_leftover_process_stop);
864
865 mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD);
866
867 m->exec_runtime = exec_runtime_unref(m->exec_runtime, true);
868
869 unit_destroy_runtime_data(UNIT(m), &m->exec_context);
870
871 unit_unref_uid_gid(UNIT(m), true);
872
873 dynamic_creds_destroy(&m->dynamic_creds);
874
875 /* Any dependencies based on /proc/self/mountinfo are now stale */
876 unit_remove_dependencies(UNIT(m), UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
877 }
878
879 static void mount_enter_mounted(Mount *m, MountResult f) {
880 assert(m);
881
882 if (m->result == MOUNT_SUCCESS)
883 m->result = f;
884
885 mount_set_state(m, MOUNT_MOUNTED);
886 }
887
888 static void mount_enter_dead_or_mounted(Mount *m, MountResult f) {
889 assert(m);
890
891 /* Enter DEAD or MOUNTED state, depending on what the kernel currently says about the mount point. We use this
892 * whenever we executed an operation, so that our internal state reflects what the kernel says again, after all
893 * ultimately we just mirror the kernel's internal state on this. */
894
895 if (m->from_proc_self_mountinfo)
896 mount_enter_mounted(m, f);
897 else
898 mount_enter_dead(m, f);
899 }
900
901 static int state_to_kill_operation(MountState state) {
902 switch (state) {
903
904 case MOUNT_REMOUNTING_SIGTERM:
905 return KILL_RESTART;
906
907 case MOUNT_UNMOUNTING_SIGTERM:
908 return KILL_TERMINATE;
909
910 case MOUNT_REMOUNTING_SIGKILL:
911 case MOUNT_UNMOUNTING_SIGKILL:
912 return KILL_KILL;
913
914 default:
915 return _KILL_OPERATION_INVALID;
916 }
917 }
918
919 static void mount_enter_signal(Mount *m, MountState state, MountResult f) {
920 int r;
921
922 assert(m);
923
924 if (m->result == MOUNT_SUCCESS)
925 m->result = f;
926
927 r = unit_kill_context(
928 UNIT(m),
929 &m->kill_context,
930 state_to_kill_operation(state),
931 -1,
932 m->control_pid,
933 false);
934 if (r < 0)
935 goto fail;
936
937 if (r > 0) {
938 r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
939 if (r < 0)
940 goto fail;
941
942 mount_set_state(m, state);
943 } else if (state == MOUNT_REMOUNTING_SIGTERM && m->kill_context.send_sigkill)
944 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
945 else if (IN_SET(state, MOUNT_REMOUNTING_SIGTERM, MOUNT_REMOUNTING_SIGKILL))
946 mount_enter_mounted(m, MOUNT_SUCCESS);
947 else if (state == MOUNT_UNMOUNTING_SIGTERM && m->kill_context.send_sigkill)
948 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS);
949 else
950 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
951
952 return;
953
954 fail:
955 log_unit_warning_errno(UNIT(m), r, "Failed to kill processes: %m");
956 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
957 }
958
959 static void mount_enter_unmounting(Mount *m) {
960 int r;
961
962 assert(m);
963
964 /* Start counting our attempts */
965 if (!IN_SET(m->state,
966 MOUNT_UNMOUNTING,
967 MOUNT_UNMOUNTING_SIGTERM,
968 MOUNT_UNMOUNTING_SIGKILL))
969 m->n_retry_umount = 0;
970
971 m->control_command_id = MOUNT_EXEC_UNMOUNT;
972 m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
973
974 r = exec_command_set(m->control_command, UMOUNT_PATH, m->where, "-c", NULL);
975 if (r >= 0 && m->lazy_unmount)
976 r = exec_command_append(m->control_command, "-l", NULL);
977 if (r >= 0 && m->force_unmount)
978 r = exec_command_append(m->control_command, "-f", NULL);
979 if (r < 0)
980 goto fail;
981
982 mount_unwatch_control_pid(m);
983
984 r = mount_spawn(m, m->control_command, &m->control_pid);
985 if (r < 0)
986 goto fail;
987
988 mount_set_state(m, MOUNT_UNMOUNTING);
989
990 return;
991
992 fail:
993 log_unit_warning_errno(UNIT(m), r, "Failed to run 'umount' task: %m");
994 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
995 }
996
997 static void mount_enter_mounting(Mount *m) {
998 int r;
999 MountParameters *p;
1000
1001 assert(m);
1002
1003 r = unit_fail_if_noncanonical(UNIT(m), m->where);
1004 if (r < 0)
1005 goto fail;
1006
1007 (void) mkdir_p_label(m->where, m->directory_mode);
1008
1009 unit_warn_if_dir_nonempty(UNIT(m), m->where);
1010 unit_warn_leftover_processes(UNIT(m), unit_log_leftover_process_start);
1011
1012 m->control_command_id = MOUNT_EXEC_MOUNT;
1013 m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
1014
1015 /* Create the source directory for bind-mounts if needed */
1016 p = get_mount_parameters_fragment(m);
1017 if (p && mount_is_bind(p)) {
1018 r = mkdir_p_label(p->what, m->directory_mode);
1019 if (r < 0)
1020 log_unit_error_errno(UNIT(m), r, "Failed to make bind mount source '%s': %m", p->what);
1021 }
1022
1023 if (p) {
1024 _cleanup_free_ char *opts = NULL;
1025
1026 r = fstab_filter_options(p->options, "nofail\0" "noauto\0" "auto\0", NULL, NULL, &opts);
1027 if (r < 0)
1028 goto fail;
1029
1030 r = exec_command_set(m->control_command, MOUNT_PATH, p->what, m->where, NULL);
1031 if (r >= 0 && m->sloppy_options)
1032 r = exec_command_append(m->control_command, "-s", NULL);
1033 if (r >= 0 && m->read_write_only)
1034 r = exec_command_append(m->control_command, "-w", NULL);
1035 if (r >= 0 && p->fstype)
1036 r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
1037 if (r >= 0 && !isempty(opts))
1038 r = exec_command_append(m->control_command, "-o", opts, 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_MOUNTING);
1051
1052 return;
1053
1054 fail:
1055 log_unit_warning_errno(UNIT(m), r, "Failed to run 'mount' task: %m");
1056 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
1057 }
1058
1059 static void mount_set_reload_result(Mount *m, MountResult result) {
1060 assert(m);
1061
1062 /* Only store the first error we encounter */
1063 if (m->reload_result != MOUNT_SUCCESS)
1064 return;
1065
1066 m->reload_result = result;
1067 }
1068
1069 static void mount_enter_remounting(Mount *m) {
1070 int r;
1071 MountParameters *p;
1072
1073 assert(m);
1074
1075 /* Reset reload result when we are about to start a new remount operation */
1076 m->reload_result = MOUNT_SUCCESS;
1077
1078 m->control_command_id = MOUNT_EXEC_REMOUNT;
1079 m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
1080
1081 p = get_mount_parameters_fragment(m);
1082 if (p) {
1083 const char *o;
1084
1085 if (p->options)
1086 o = strjoina("remount,", p->options);
1087 else
1088 o = "remount";
1089
1090 r = exec_command_set(m->control_command, MOUNT_PATH,
1091 p->what, m->where,
1092 "-o", o, NULL);
1093 if (r >= 0 && m->sloppy_options)
1094 r = exec_command_append(m->control_command, "-s", NULL);
1095 if (r >= 0 && m->read_write_only)
1096 r = exec_command_append(m->control_command, "-w", NULL);
1097 if (r >= 0 && p->fstype)
1098 r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
1099 } else
1100 r = -ENOENT;
1101 if (r < 0)
1102 goto fail;
1103
1104 mount_unwatch_control_pid(m);
1105
1106 r = mount_spawn(m, m->control_command, &m->control_pid);
1107 if (r < 0)
1108 goto fail;
1109
1110 mount_set_state(m, MOUNT_REMOUNTING);
1111
1112 return;
1113
1114 fail:
1115 log_unit_warning_errno(UNIT(m), r, "Failed to run 'remount' task: %m");
1116 mount_set_reload_result(m, MOUNT_FAILURE_RESOURCES);
1117 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1118 }
1119
1120 static void mount_cycle_clear(Mount *m) {
1121 assert(m);
1122
1123 /* Clear all state we shall forget for this new cycle */
1124
1125 m->result = MOUNT_SUCCESS;
1126 m->reload_result = MOUNT_SUCCESS;
1127 exec_command_reset_status_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
1128 UNIT(m)->reset_accounting = true;
1129 }
1130
1131 static int mount_start(Unit *u) {
1132 Mount *m = MOUNT(u);
1133 int r;
1134
1135 assert(m);
1136
1137 /* We cannot fulfill this request right now, try again later
1138 * please! */
1139 if (IN_SET(m->state,
1140 MOUNT_UNMOUNTING,
1141 MOUNT_UNMOUNTING_SIGTERM,
1142 MOUNT_UNMOUNTING_SIGKILL,
1143 MOUNT_CLEANING))
1144 return -EAGAIN;
1145
1146 /* Already on it! */
1147 if (m->state == MOUNT_MOUNTING)
1148 return 0;
1149
1150 assert(IN_SET(m->state, MOUNT_DEAD, MOUNT_FAILED));
1151
1152 r = unit_test_start_limit(u);
1153 if (r < 0) {
1154 mount_enter_dead(m, MOUNT_FAILURE_START_LIMIT_HIT);
1155 return r;
1156 }
1157
1158 r = unit_acquire_invocation_id(u);
1159 if (r < 0)
1160 return r;
1161
1162 mount_cycle_clear(m);
1163 mount_enter_mounting(m);
1164
1165 return 1;
1166 }
1167
1168 static int mount_stop(Unit *u) {
1169 Mount *m = MOUNT(u);
1170
1171 assert(m);
1172
1173 switch (m->state) {
1174
1175 case MOUNT_UNMOUNTING:
1176 case MOUNT_UNMOUNTING_SIGKILL:
1177 case MOUNT_UNMOUNTING_SIGTERM:
1178 /* Already on it */
1179 return 0;
1180
1181 case MOUNT_MOUNTING:
1182 case MOUNT_MOUNTING_DONE:
1183 case MOUNT_REMOUNTING:
1184 /* If we are still waiting for /bin/mount, we go directly into kill mode. */
1185 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_SUCCESS);
1186 return 0;
1187
1188 case MOUNT_REMOUNTING_SIGTERM:
1189 /* If we are already waiting for a hung remount, convert this to the matching unmounting state */
1190 mount_set_state(m, MOUNT_UNMOUNTING_SIGTERM);
1191 return 0;
1192
1193 case MOUNT_REMOUNTING_SIGKILL:
1194 /* as above */
1195 mount_set_state(m, MOUNT_UNMOUNTING_SIGKILL);
1196 return 0;
1197
1198 case MOUNT_MOUNTED:
1199 mount_enter_unmounting(m);
1200 return 1;
1201
1202 case MOUNT_CLEANING:
1203 /* If we are currently cleaning, then abort it, brutally. */
1204 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS);
1205 return 0;
1206
1207 default:
1208 assert_not_reached("Unexpected state.");
1209 }
1210 }
1211
1212 static int mount_reload(Unit *u) {
1213 Mount *m = MOUNT(u);
1214
1215 assert(m);
1216 assert(m->state == MOUNT_MOUNTED);
1217
1218 mount_enter_remounting(m);
1219
1220 return 1;
1221 }
1222
1223 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
1224 Mount *m = MOUNT(u);
1225
1226 assert(m);
1227 assert(f);
1228 assert(fds);
1229
1230 (void) serialize_item(f, "state", mount_state_to_string(m->state));
1231 (void) serialize_item(f, "result", mount_result_to_string(m->result));
1232 (void) serialize_item(f, "reload-result", mount_result_to_string(m->reload_result));
1233 (void) serialize_item_format(f, "n-retry-umount", "%u", m->n_retry_umount);
1234
1235 if (m->control_pid > 0)
1236 (void) serialize_item_format(f, "control-pid", PID_FMT, m->control_pid);
1237
1238 if (m->control_command_id >= 0)
1239 (void) serialize_item(f, "control-command", mount_exec_command_to_string(m->control_command_id));
1240
1241 return 0;
1242 }
1243
1244 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1245 Mount *m = MOUNT(u);
1246 int r;
1247
1248 assert(u);
1249 assert(key);
1250 assert(value);
1251 assert(fds);
1252
1253 if (streq(key, "state")) {
1254 MountState state;
1255
1256 if ((state = mount_state_from_string(value)) < 0)
1257 log_unit_debug(u, "Failed to parse state value: %s", value);
1258 else
1259 m->deserialized_state = state;
1260
1261 } else if (streq(key, "result")) {
1262 MountResult f;
1263
1264 f = mount_result_from_string(value);
1265 if (f < 0)
1266 log_unit_debug(u, "Failed to parse result value: %s", value);
1267 else if (f != MOUNT_SUCCESS)
1268 m->result = f;
1269
1270 } else if (streq(key, "reload-result")) {
1271 MountResult f;
1272
1273 f = mount_result_from_string(value);
1274 if (f < 0)
1275 log_unit_debug(u, "Failed to parse reload result value: %s", value);
1276 else if (f != MOUNT_SUCCESS)
1277 m->reload_result = f;
1278
1279 } else if (streq(key, "n-retry-umount")) {
1280
1281 r = safe_atou(value, &m->n_retry_umount);
1282 if (r < 0)
1283 log_unit_debug(u, "Failed to parse n-retry-umount value: %s", value);
1284
1285 } else if (streq(key, "control-pid")) {
1286
1287 if (parse_pid(value, &m->control_pid) < 0)
1288 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
1289
1290 } else if (streq(key, "control-command")) {
1291 MountExecCommand id;
1292
1293 id = mount_exec_command_from_string(value);
1294 if (id < 0)
1295 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
1296 else {
1297 m->control_command_id = id;
1298 m->control_command = m->exec_command + id;
1299 }
1300 } else
1301 log_unit_debug(u, "Unknown serialization key: %s", key);
1302
1303 return 0;
1304 }
1305
1306 _pure_ static UnitActiveState mount_active_state(Unit *u) {
1307 assert(u);
1308
1309 return state_translation_table[MOUNT(u)->state];
1310 }
1311
1312 _pure_ static const char *mount_sub_state_to_string(Unit *u) {
1313 assert(u);
1314
1315 return mount_state_to_string(MOUNT(u)->state);
1316 }
1317
1318 _pure_ static bool mount_may_gc(Unit *u) {
1319 Mount *m = MOUNT(u);
1320
1321 assert(m);
1322
1323 if (m->from_proc_self_mountinfo)
1324 return false;
1325
1326 return true;
1327 }
1328
1329 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1330 Mount *m = MOUNT(u);
1331 MountResult f;
1332
1333 assert(m);
1334 assert(pid >= 0);
1335
1336 if (pid != m->control_pid)
1337 return;
1338
1339 /* So here's the thing, we really want to know before /usr/bin/mount or /usr/bin/umount exit whether
1340 * they established/remove a mount. This is important when mounting, but even more so when unmounting
1341 * since we need to deal with nested mounts and otherwise cannot safely determine whether to repeat
1342 * the unmounts. In theory, the kernel fires /proc/self/mountinfo changes off before returning from
1343 * the mount() or umount() syscalls, and thus we should see the changes to the proc file before we
1344 * process the waitid() for the /usr/bin/(u)mount processes. However, this is unfortunately racy: we
1345 * have to waitid() for processes using P_ALL (since we need to reap unexpected children that got
1346 * reparented to PID 1), but when using P_ALL we might end up reaping processes that terminated just
1347 * instants ago, i.e. already after our last event loop iteration (i.e. after the last point we might
1348 * have noticed /proc/self/mountinfo events via epoll). This means event loop priorities for
1349 * processing SIGCHLD vs. /proc/self/mountinfo IO events are not as relevant as we want. To fix that
1350 * race, let's explicitly scan /proc/self/mountinfo before we start processing /usr/bin/(u)mount
1351 * dying. It's ugly, but it makes our ordering systematic again, and makes sure we always see
1352 * /proc/self/mountinfo changes before our mount/umount exits. */
1353 (void) mount_process_proc_self_mountinfo(u->manager);
1354
1355 m->control_pid = 0;
1356
1357 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
1358 f = MOUNT_SUCCESS;
1359 else if (code == CLD_EXITED)
1360 f = MOUNT_FAILURE_EXIT_CODE;
1361 else if (code == CLD_KILLED)
1362 f = MOUNT_FAILURE_SIGNAL;
1363 else if (code == CLD_DUMPED)
1364 f = MOUNT_FAILURE_CORE_DUMP;
1365 else
1366 assert_not_reached("Unknown code");
1367
1368 if (IN_SET(m->state, MOUNT_REMOUNTING, MOUNT_REMOUNTING_SIGKILL, MOUNT_REMOUNTING_SIGTERM))
1369 mount_set_reload_result(m, f);
1370 else if (m->result == MOUNT_SUCCESS)
1371 m->result = f;
1372
1373 if (m->control_command) {
1374 exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status);
1375
1376 m->control_command = NULL;
1377 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1378 }
1379
1380 unit_log_process_exit(
1381 u,
1382 "Mount process",
1383 mount_exec_command_to_string(m->control_command_id),
1384 f == MOUNT_SUCCESS,
1385 code, status);
1386
1387 /* Note that due to the io event priority logic, we can be sure the new mountinfo is loaded
1388 * before we process the SIGCHLD for the mount command. */
1389
1390 switch (m->state) {
1391
1392 case MOUNT_MOUNTING:
1393 /* Our mount point has not appeared in mountinfo. Something went wrong. */
1394
1395 if (f == MOUNT_SUCCESS) {
1396 /* Either /bin/mount has an unexpected definition of success,
1397 * or someone raced us and we lost. */
1398 log_unit_warning(UNIT(m), "Mount process finished, but there is no mount.");
1399 f = MOUNT_FAILURE_PROTOCOL;
1400 }
1401 mount_enter_dead(m, f);
1402 break;
1403
1404 case MOUNT_MOUNTING_DONE:
1405 mount_enter_mounted(m, f);
1406 break;
1407
1408 case MOUNT_REMOUNTING:
1409 case MOUNT_REMOUNTING_SIGTERM:
1410 case MOUNT_REMOUNTING_SIGKILL:
1411 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1412 break;
1413
1414 case MOUNT_UNMOUNTING:
1415
1416 if (f == MOUNT_SUCCESS && m->from_proc_self_mountinfo) {
1417
1418 /* Still a mount point? If so, let's try again. Most likely there were multiple mount points
1419 * stacked on top of each other. We might exceed the timeout specified by the user overall,
1420 * but we will stop as soon as any one umount times out. */
1421
1422 if (m->n_retry_umount < RETRY_UMOUNT_MAX) {
1423 log_unit_debug(u, "Mount still present, trying again.");
1424 m->n_retry_umount++;
1425 mount_enter_unmounting(m);
1426 } else {
1427 log_unit_warning(u, "Mount still present after %u attempts to unmount, giving up.", m->n_retry_umount);
1428 mount_enter_mounted(m, f);
1429 }
1430 } else
1431 mount_enter_dead_or_mounted(m, f);
1432
1433 break;
1434
1435 case MOUNT_UNMOUNTING_SIGKILL:
1436 case MOUNT_UNMOUNTING_SIGTERM:
1437 mount_enter_dead_or_mounted(m, f);
1438 break;
1439
1440 case MOUNT_CLEANING:
1441 if (m->clean_result == MOUNT_SUCCESS)
1442 m->clean_result = f;
1443
1444 mount_enter_dead(m, MOUNT_SUCCESS);
1445 break;
1446
1447 default:
1448 assert_not_reached("Uh, control process died at wrong time.");
1449 }
1450
1451 /* Notify clients about changed exit status */
1452 unit_add_to_dbus_queue(u);
1453 }
1454
1455 static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
1456 Mount *m = MOUNT(userdata);
1457
1458 assert(m);
1459 assert(m->timer_event_source == source);
1460
1461 switch (m->state) {
1462
1463 case MOUNT_MOUNTING:
1464 case MOUNT_MOUNTING_DONE:
1465 log_unit_warning(UNIT(m), "Mounting timed out. Terminating.");
1466 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1467 break;
1468
1469 case MOUNT_REMOUNTING:
1470 log_unit_warning(UNIT(m), "Remounting timed out. Terminating remount process.");
1471 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1472 mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, MOUNT_SUCCESS);
1473 break;
1474
1475 case MOUNT_REMOUNTING_SIGTERM:
1476 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1477
1478 if (m->kill_context.send_sigkill) {
1479 log_unit_warning(UNIT(m), "Remounting timed out. Killing.");
1480 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
1481 } else {
1482 log_unit_warning(UNIT(m), "Remounting timed out. Skipping SIGKILL. Ignoring.");
1483 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1484 }
1485 break;
1486
1487 case MOUNT_REMOUNTING_SIGKILL:
1488 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1489
1490 log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
1491 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1492 break;
1493
1494 case MOUNT_UNMOUNTING:
1495 log_unit_warning(UNIT(m), "Unmounting timed out. Terminating.");
1496 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1497 break;
1498
1499 case MOUNT_UNMOUNTING_SIGTERM:
1500 if (m->kill_context.send_sigkill) {
1501 log_unit_warning(UNIT(m), "Mount process timed out. Killing.");
1502 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
1503 } else {
1504 log_unit_warning(UNIT(m), "Mount process timed out. Skipping SIGKILL. Ignoring.");
1505 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
1506 }
1507 break;
1508
1509 case MOUNT_UNMOUNTING_SIGKILL:
1510 log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
1511 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
1512 break;
1513
1514 case MOUNT_CLEANING:
1515 log_unit_warning(UNIT(m), "Cleaning timed out. killing.");
1516
1517 if (m->clean_result == MOUNT_SUCCESS)
1518 m->clean_result = MOUNT_FAILURE_TIMEOUT;
1519
1520 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, 0);
1521 break;
1522
1523 default:
1524 assert_not_reached("Timeout at wrong time.");
1525 }
1526
1527 return 0;
1528 }
1529
1530 static int mount_setup_new_unit(
1531 Manager *m,
1532 const char *name,
1533 const char *what,
1534 const char *where,
1535 const char *options,
1536 const char *fstype,
1537 MountProcFlags *ret_flags,
1538 Unit **ret) {
1539
1540 _cleanup_(unit_freep) Unit *u = NULL;
1541 int r;
1542
1543 assert(m);
1544 assert(name);
1545 assert(ret_flags);
1546 assert(ret);
1547
1548 r = unit_new_for_name(m, sizeof(Mount), name, &u);
1549 if (r < 0)
1550 return r;
1551
1552 r = free_and_strdup(&u->source_path, "/proc/self/mountinfo");
1553 if (r < 0)
1554 return r;
1555
1556 r = free_and_strdup(&MOUNT(u)->where, where);
1557 if (r < 0)
1558 return r;
1559
1560 r = update_parameters_proc_self_mountinfo(MOUNT(u), what, options, fstype);
1561 if (r < 0)
1562 return r;
1563
1564 /* This unit was generated because /proc/self/mountinfo reported it. Remember this, so that by the time we load
1565 * the unit file for it (and thus add in extra deps right after) we know what source to attributes the deps
1566 * to.*/
1567 MOUNT(u)->from_proc_self_mountinfo = true;
1568
1569 /* We have only allocated the stub now, let's enqueue this unit for loading now, so that everything else is
1570 * loaded in now. */
1571 unit_add_to_load_queue(u);
1572
1573 *ret_flags = MOUNT_PROC_IS_MOUNTED | MOUNT_PROC_JUST_MOUNTED | MOUNT_PROC_JUST_CHANGED;
1574 *ret = TAKE_PTR(u);
1575 return 0;
1576 }
1577
1578 static int mount_setup_existing_unit(
1579 Unit *u,
1580 const char *what,
1581 const char *where,
1582 const char *options,
1583 const char *fstype,
1584 MountProcFlags *ret_flags) {
1585
1586 int r;
1587
1588 assert(u);
1589 assert(ret_flags);
1590
1591 if (!MOUNT(u)->where) {
1592 MOUNT(u)->where = strdup(where);
1593 if (!MOUNT(u)->where)
1594 return -ENOMEM;
1595 }
1596
1597 /* In case we have multiple mounts established on the same mount point, let's merge flags set already
1598 * for the current unit. Note that the flags field is reset on each iteration of reading
1599 * /proc/self/mountinfo, hence we know for sure anything already set here is from the current
1600 * iteration and thus worthy of taking into account. */
1601 MountProcFlags flags =
1602 MOUNT(u)->proc_flags | MOUNT_PROC_IS_MOUNTED;
1603
1604 r = update_parameters_proc_self_mountinfo(MOUNT(u), what, options, fstype);
1605 if (r < 0)
1606 return r;
1607 if (r > 0)
1608 flags |= MOUNT_PROC_JUST_CHANGED;
1609
1610 /* There are two conditions when we consider a mount point just mounted: when we haven't seen it in
1611 * /proc/self/mountinfo before or when MOUNT_MOUNTING is our current state. Why bother with the
1612 * latter? Shouldn't that be covered by the former? No, during reload it is not because we might then
1613 * encounter a new /proc/self/mountinfo in combination with an old mount unit state (since it stems
1614 * from the serialized state), and need to catch up. Since we know that the MOUNT_MOUNTING state is
1615 * reached when we wait for the mount to appear we hence can assume that if we are in it, we are
1616 * actually seeing it established for the first time. */
1617 if (!MOUNT(u)->from_proc_self_mountinfo || MOUNT(u)->state == MOUNT_MOUNTING)
1618 flags |= MOUNT_PROC_JUST_MOUNTED;
1619
1620 MOUNT(u)->from_proc_self_mountinfo = true;
1621
1622 if (IN_SET(u->load_state, UNIT_NOT_FOUND, UNIT_BAD_SETTING, UNIT_ERROR)) {
1623 /* The unit was previously not found or otherwise not loaded. Now that the unit shows up in
1624 * /proc/self/mountinfo we should reconsider it this, hence set it to UNIT_LOADED. */
1625 u->load_state = UNIT_LOADED;
1626 u->load_error = 0;
1627
1628 flags |= MOUNT_PROC_JUST_CHANGED;
1629 }
1630
1631 if (FLAGS_SET(flags, MOUNT_PROC_JUST_CHANGED)) {
1632 /* If things changed, then make sure that all deps are regenerated. Let's
1633 * first remove all automatic deps, and then add in the new ones. */
1634
1635 unit_remove_dependencies(u, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
1636
1637 r = mount_add_non_exec_dependencies(MOUNT(u));
1638 if (r < 0)
1639 return r;
1640 }
1641
1642 *ret_flags = flags;
1643 return 0;
1644 }
1645
1646 static int mount_setup_unit(
1647 Manager *m,
1648 const char *what,
1649 const char *where,
1650 const char *options,
1651 const char *fstype,
1652 bool set_flags) {
1653
1654 _cleanup_free_ char *e = NULL;
1655 MountProcFlags flags;
1656 Unit *u;
1657 int r;
1658
1659 assert(m);
1660 assert(what);
1661 assert(where);
1662 assert(options);
1663 assert(fstype);
1664
1665 /* Ignore API mount points. They should never be referenced in
1666 * dependencies ever. */
1667 if (mount_point_is_api(where) || mount_point_ignore(where))
1668 return 0;
1669
1670 if (streq(fstype, "autofs"))
1671 return 0;
1672
1673 /* probably some kind of swap, ignore */
1674 if (!is_path(where))
1675 return 0;
1676
1677 /* Mount unit names have to be (like all other unit names) short enough to fit into file names. This
1678 * means there's a good chance that overly long mount point paths after mangling them to look like a
1679 * unit name would result in unit names we don't actually consider valid. This should be OK however
1680 * as such long mount point paths should not happen on regular systems — and if they appear
1681 * nonetheless they are generally synthesized by software, and thus managed by that other
1682 * software. Having such long names just means you cannot use systemd to manage those specific mount
1683 * points, which should be an OK restriction to make. After all we don't have to be able to manage
1684 * all mount points in the world — as long as we don't choke on them when we encounter them. */
1685 r = unit_name_from_path(where, ".mount", &e);
1686 if (r < 0) {
1687 static RateLimit rate_limit = { /* Let's log about this at warning level at most once every
1688 * 5s. Given that we generate this whenever we read the file
1689 * otherwise we probably shouldn't flood the logs with
1690 * this */
1691 .interval = 5 * USEC_PER_SEC,
1692 .burst = 1,
1693 };
1694
1695 return log_struct_errno(
1696 ratelimit_below(&rate_limit) ? LOG_WARNING : LOG_DEBUG, r,
1697 "MESSAGE_ID=" SD_MESSAGE_MOUNT_POINT_PATH_NOT_SUITABLE_STR,
1698 "MOUNT_POINT=%s", where,
1699 LOG_MESSAGE("Failed to generate valid unit name from path '%s', ignoring mount point: %m", where));
1700 }
1701
1702 u = manager_get_unit(m, e);
1703 if (u)
1704 r = mount_setup_existing_unit(u, what, where, options, fstype, &flags);
1705 else
1706 /* First time we see this mount point meaning that it's not been initiated by a mount unit but rather
1707 * by the sysadmin having called mount(8) directly. */
1708 r = mount_setup_new_unit(m, e, what, where, options, fstype, &flags, &u);
1709 if (r < 0)
1710 return log_warning_errno(r, "Failed to set up mount unit for '%s': %m", where);
1711
1712 /* If the mount changed properties or state, let's notify our clients */
1713 if (flags & (MOUNT_PROC_JUST_CHANGED|MOUNT_PROC_JUST_MOUNTED))
1714 unit_add_to_dbus_queue(u);
1715
1716 if (set_flags)
1717 MOUNT(u)->proc_flags = flags;
1718
1719 return 0;
1720 }
1721
1722 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1723 _cleanup_(mnt_free_tablep) struct libmnt_table *table = NULL;
1724 _cleanup_(mnt_free_iterp) struct libmnt_iter *iter = NULL;
1725 int r;
1726
1727 assert(m);
1728
1729 r = libmount_parse(NULL, NULL, &table, &iter);
1730 if (r < 0)
1731 return log_error_errno(r, "Failed to parse /proc/self/mountinfo: %m");
1732
1733 for (;;) {
1734 struct libmnt_fs *fs;
1735 const char *device, *path, *options, *fstype;
1736
1737 r = mnt_table_next_fs(table, iter, &fs);
1738 if (r == 1)
1739 break;
1740 if (r < 0)
1741 return log_error_errno(r, "Failed to get next entry from /proc/self/mountinfo: %m");
1742
1743 device = mnt_fs_get_source(fs);
1744 path = mnt_fs_get_target(fs);
1745 options = mnt_fs_get_options(fs);
1746 fstype = mnt_fs_get_fstype(fs);
1747
1748 if (!device || !path)
1749 continue;
1750
1751 device_found_node(m, device, DEVICE_FOUND_MOUNT, DEVICE_FOUND_MOUNT);
1752
1753 (void) mount_setup_unit(m, device, path, options, fstype, set_flags);
1754 }
1755
1756 return 0;
1757 }
1758
1759 static void mount_shutdown(Manager *m) {
1760 assert(m);
1761
1762 m->mount_event_source = sd_event_source_unref(m->mount_event_source);
1763
1764 mnt_unref_monitor(m->mount_monitor);
1765 m->mount_monitor = NULL;
1766 }
1767
1768 static int mount_get_timeout(Unit *u, usec_t *timeout) {
1769 Mount *m = MOUNT(u);
1770 usec_t t;
1771 int r;
1772
1773 if (!m->timer_event_source)
1774 return 0;
1775
1776 r = sd_event_source_get_time(m->timer_event_source, &t);
1777 if (r < 0)
1778 return r;
1779 if (t == USEC_INFINITY)
1780 return 0;
1781
1782 *timeout = t;
1783 return 1;
1784 }
1785
1786 static void mount_enumerate_perpetual(Manager *m) {
1787 Unit *u;
1788 int r;
1789
1790 assert(m);
1791
1792 /* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's
1793 * unconditionally synthesize it here and mark it as perpetual. */
1794
1795 u = manager_get_unit(m, SPECIAL_ROOT_MOUNT);
1796 if (!u) {
1797 r = unit_new_for_name(m, sizeof(Mount), SPECIAL_ROOT_MOUNT, &u);
1798 if (r < 0) {
1799 log_error_errno(r, "Failed to allocate the special " SPECIAL_ROOT_MOUNT " unit: %m");
1800 return;
1801 }
1802 }
1803
1804 u->perpetual = true;
1805 MOUNT(u)->deserialized_state = MOUNT_MOUNTED;
1806
1807 unit_add_to_load_queue(u);
1808 unit_add_to_dbus_queue(u);
1809 }
1810
1811 static bool mount_is_mounted(Mount *m) {
1812 assert(m);
1813
1814 return UNIT(m)->perpetual || FLAGS_SET(m->proc_flags, MOUNT_PROC_IS_MOUNTED);
1815 }
1816
1817 static void mount_enumerate(Manager *m) {
1818 int r;
1819
1820 assert(m);
1821
1822 mnt_init_debug(0);
1823
1824 if (!m->mount_monitor) {
1825 int fd;
1826
1827 m->mount_monitor = mnt_new_monitor();
1828 if (!m->mount_monitor) {
1829 log_oom();
1830 goto fail;
1831 }
1832
1833 r = mnt_monitor_enable_kernel(m->mount_monitor, 1);
1834 if (r < 0) {
1835 log_error_errno(r, "Failed to enable watching of kernel mount events: %m");
1836 goto fail;
1837 }
1838
1839 r = mnt_monitor_enable_userspace(m->mount_monitor, 1, NULL);
1840 if (r < 0) {
1841 log_error_errno(r, "Failed to enable watching of userspace mount events: %m");
1842 goto fail;
1843 }
1844
1845 /* mnt_unref_monitor() will close the fd */
1846 fd = r = mnt_monitor_get_fd(m->mount_monitor);
1847 if (r < 0) {
1848 log_error_errno(r, "Failed to acquire watch file descriptor: %m");
1849 goto fail;
1850 }
1851
1852 r = sd_event_add_io(m->event, &m->mount_event_source, fd, EPOLLIN, mount_dispatch_io, m);
1853 if (r < 0) {
1854 log_error_errno(r, "Failed to watch mount file descriptor: %m");
1855 goto fail;
1856 }
1857
1858 r = sd_event_source_set_priority(m->mount_event_source, SD_EVENT_PRIORITY_NORMAL-10);
1859 if (r < 0) {
1860 log_error_errno(r, "Failed to adjust mount watch priority: %m");
1861 goto fail;
1862 }
1863
1864 (void) sd_event_source_set_description(m->mount_event_source, "mount-monitor-dispatch");
1865 }
1866
1867 r = mount_load_proc_self_mountinfo(m, false);
1868 if (r < 0)
1869 goto fail;
1870
1871 return;
1872
1873 fail:
1874 mount_shutdown(m);
1875 }
1876
1877 static int drain_libmount(Manager *m) {
1878 bool rescan = false;
1879 int r;
1880
1881 assert(m);
1882
1883 /* Drain all events and verify that the event is valid.
1884 *
1885 * Note that libmount also monitors /run/mount mkdir if the directory does not exist yet. The mkdir
1886 * may generate event which is irrelevant for us.
1887 *
1888 * error: r < 0; valid: r == 0, false positive: r == 1 */
1889 do {
1890 r = mnt_monitor_next_change(m->mount_monitor, NULL, NULL);
1891 if (r < 0)
1892 return log_error_errno(r, "Failed to drain libmount events: %m");
1893 if (r == 0)
1894 rescan = true;
1895 } while (r == 0);
1896
1897 return rescan;
1898 }
1899
1900 static int mount_process_proc_self_mountinfo(Manager *m) {
1901 _cleanup_set_free_free_ Set *around = NULL, *gone = NULL;
1902 const char *what;
1903 Unit *u;
1904 int r;
1905
1906 assert(m);
1907
1908 r = drain_libmount(m);
1909 if (r <= 0)
1910 return r;
1911
1912 r = mount_load_proc_self_mountinfo(m, true);
1913 if (r < 0) {
1914 /* Reset flags, just in case, for later calls */
1915 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT])
1916 MOUNT(u)->proc_flags = 0;
1917
1918 return 0;
1919 }
1920
1921 manager_dispatch_load_queue(m);
1922
1923 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1924 Mount *mount = MOUNT(u);
1925
1926 if (!mount_is_mounted(mount)) {
1927
1928 /* A mount point is not around right now. It
1929 * might be gone, or might never have
1930 * existed. */
1931
1932 if (mount->from_proc_self_mountinfo &&
1933 mount->parameters_proc_self_mountinfo.what) {
1934
1935 /* Remember that this device might just have disappeared */
1936 if (set_ensure_allocated(&gone, &path_hash_ops) < 0 ||
1937 set_put_strdup(&gone, mount->parameters_proc_self_mountinfo.what) < 0)
1938 log_oom(); /* we don't care too much about OOM here... */
1939 }
1940
1941 mount->from_proc_self_mountinfo = false;
1942 assert_se(update_parameters_proc_self_mountinfo(mount, NULL, NULL, NULL) >= 0);
1943
1944 switch (mount->state) {
1945
1946 case MOUNT_MOUNTED:
1947 /* This has just been unmounted by somebody else, follow the state change. */
1948 mount_enter_dead(mount, MOUNT_SUCCESS);
1949 break;
1950
1951 default:
1952 break;
1953 }
1954
1955 } else if (mount->proc_flags & (MOUNT_PROC_JUST_MOUNTED|MOUNT_PROC_JUST_CHANGED)) {
1956
1957 /* A mount point was added or changed */
1958
1959 switch (mount->state) {
1960
1961 case MOUNT_DEAD:
1962 case MOUNT_FAILED:
1963
1964 /* This has just been mounted by somebody else, follow the state change, but let's
1965 * generate a new invocation ID for this implicitly and automatically. */
1966 (void) unit_acquire_invocation_id(u);
1967 mount_cycle_clear(mount);
1968 mount_enter_mounted(mount, MOUNT_SUCCESS);
1969 break;
1970
1971 case MOUNT_MOUNTING:
1972 mount_set_state(mount, MOUNT_MOUNTING_DONE);
1973 break;
1974
1975 default:
1976 /* Nothing really changed, but let's
1977 * issue an notification call
1978 * nonetheless, in case somebody is
1979 * waiting for this. (e.g. file system
1980 * ro/rw remounts.) */
1981 mount_set_state(mount, mount->state);
1982 break;
1983 }
1984 }
1985
1986 if (mount_is_mounted(mount) &&
1987 mount->from_proc_self_mountinfo &&
1988 mount->parameters_proc_self_mountinfo.what) {
1989 /* Track devices currently used */
1990
1991 if (set_ensure_allocated(&around, &path_hash_ops) < 0 ||
1992 set_put_strdup(&around, mount->parameters_proc_self_mountinfo.what) < 0)
1993 log_oom();
1994 }
1995
1996 /* Reset the flags for later calls */
1997 mount->proc_flags = 0;
1998 }
1999
2000 SET_FOREACH(what, gone) {
2001 if (set_contains(around, what))
2002 continue;
2003
2004 /* Let the device units know that the device is no longer mounted */
2005 device_found_node(m, what, 0, DEVICE_FOUND_MOUNT);
2006 }
2007
2008 return 0;
2009 }
2010
2011 static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2012 Manager *m = userdata;
2013
2014 assert(m);
2015 assert(revents & EPOLLIN);
2016
2017 return mount_process_proc_self_mountinfo(m);
2018 }
2019
2020 static void mount_reset_failed(Unit *u) {
2021 Mount *m = MOUNT(u);
2022
2023 assert(m);
2024
2025 if (m->state == MOUNT_FAILED)
2026 mount_set_state(m, MOUNT_DEAD);
2027
2028 m->result = MOUNT_SUCCESS;
2029 m->reload_result = MOUNT_SUCCESS;
2030 m->clean_result = MOUNT_SUCCESS;
2031 }
2032
2033 static int mount_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
2034 Mount *m = MOUNT(u);
2035
2036 assert(m);
2037
2038 return unit_kill_common(u, who, signo, -1, m->control_pid, error);
2039 }
2040
2041 static int mount_control_pid(Unit *u) {
2042 Mount *m = MOUNT(u);
2043
2044 assert(m);
2045
2046 return m->control_pid;
2047 }
2048
2049 static int mount_clean(Unit *u, ExecCleanMask mask) {
2050 _cleanup_strv_free_ char **l = NULL;
2051 Mount *m = MOUNT(u);
2052 int r;
2053
2054 assert(m);
2055 assert(mask != 0);
2056
2057 if (m->state != MOUNT_DEAD)
2058 return -EBUSY;
2059
2060 r = exec_context_get_clean_directories(&m->exec_context, u->manager->prefix, mask, &l);
2061 if (r < 0)
2062 return r;
2063
2064 if (strv_isempty(l))
2065 return -EUNATCH;
2066
2067 mount_unwatch_control_pid(m);
2068 m->clean_result = MOUNT_SUCCESS;
2069 m->control_command = NULL;
2070 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
2071
2072 r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->exec_context.timeout_clean_usec));
2073 if (r < 0)
2074 goto fail;
2075
2076 r = unit_fork_and_watch_rm_rf(u, l, &m->control_pid);
2077 if (r < 0)
2078 goto fail;
2079
2080 mount_set_state(m, MOUNT_CLEANING);
2081
2082 return 0;
2083
2084 fail:
2085 log_unit_warning_errno(u, r, "Failed to initiate cleaning: %m");
2086 m->clean_result = MOUNT_FAILURE_RESOURCES;
2087 m->timer_event_source = sd_event_source_unref(m->timer_event_source);
2088 return r;
2089 }
2090
2091 static int mount_can_clean(Unit *u, ExecCleanMask *ret) {
2092 Mount *m = MOUNT(u);
2093
2094 assert(m);
2095
2096 return exec_context_get_clean_mask(&m->exec_context, ret);
2097 }
2098
2099 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
2100 [MOUNT_EXEC_MOUNT] = "ExecMount",
2101 [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
2102 [MOUNT_EXEC_REMOUNT] = "ExecRemount",
2103 };
2104
2105 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
2106
2107 static const char* const mount_result_table[_MOUNT_RESULT_MAX] = {
2108 [MOUNT_SUCCESS] = "success",
2109 [MOUNT_FAILURE_RESOURCES] = "resources",
2110 [MOUNT_FAILURE_TIMEOUT] = "timeout",
2111 [MOUNT_FAILURE_EXIT_CODE] = "exit-code",
2112 [MOUNT_FAILURE_SIGNAL] = "signal",
2113 [MOUNT_FAILURE_CORE_DUMP] = "core-dump",
2114 [MOUNT_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
2115 [MOUNT_FAILURE_PROTOCOL] = "protocol",
2116 };
2117
2118 DEFINE_STRING_TABLE_LOOKUP(mount_result, MountResult);
2119
2120 const UnitVTable mount_vtable = {
2121 .object_size = sizeof(Mount),
2122 .exec_context_offset = offsetof(Mount, exec_context),
2123 .cgroup_context_offset = offsetof(Mount, cgroup_context),
2124 .kill_context_offset = offsetof(Mount, kill_context),
2125 .exec_runtime_offset = offsetof(Mount, exec_runtime),
2126 .dynamic_creds_offset = offsetof(Mount, dynamic_creds),
2127
2128 .sections =
2129 "Unit\0"
2130 "Mount\0"
2131 "Install\0",
2132 .private_section = "Mount",
2133
2134 .can_transient = true,
2135 .can_fail = true,
2136
2137 .init = mount_init,
2138 .load = mount_load,
2139 .done = mount_done,
2140
2141 .coldplug = mount_coldplug,
2142
2143 .dump = mount_dump,
2144
2145 .start = mount_start,
2146 .stop = mount_stop,
2147 .reload = mount_reload,
2148
2149 .kill = mount_kill,
2150 .clean = mount_clean,
2151 .can_clean = mount_can_clean,
2152
2153 .serialize = mount_serialize,
2154 .deserialize_item = mount_deserialize_item,
2155
2156 .active_state = mount_active_state,
2157 .sub_state_to_string = mount_sub_state_to_string,
2158
2159 .will_restart = unit_will_restart_default,
2160
2161 .may_gc = mount_may_gc,
2162 .is_extrinsic = mount_is_extrinsic,
2163
2164 .sigchld_event = mount_sigchld_event,
2165
2166 .reset_failed = mount_reset_failed,
2167
2168 .control_pid = mount_control_pid,
2169
2170 .bus_set_property = bus_mount_set_property,
2171 .bus_commit_properties = bus_mount_commit_properties,
2172
2173 .get_timeout = mount_get_timeout,
2174
2175 .enumerate_perpetual = mount_enumerate_perpetual,
2176 .enumerate = mount_enumerate,
2177 .shutdown = mount_shutdown,
2178
2179 .status_message_formats = {
2180 .starting_stopping = {
2181 [0] = "Mounting %s...",
2182 [1] = "Unmounting %s...",
2183 },
2184 .finished_start_job = {
2185 [JOB_DONE] = "Mounted %s.",
2186 [JOB_FAILED] = "Failed to mount %s.",
2187 [JOB_TIMEOUT] = "Timed out mounting %s.",
2188 },
2189 .finished_stop_job = {
2190 [JOB_DONE] = "Unmounted %s.",
2191 [JOB_FAILED] = "Failed unmounting %s.",
2192 [JOB_TIMEOUT] = "Timed out unmounting %s.",
2193 },
2194 },
2195 };
Unnamed repository; edit this file 'description' to name the repository.