]> 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 #16955 from keszybz/test-execute-cleanup
[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 "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(Mount *m) {
416 MountParameters *p;
417 assert(m);
418
419 /* Returns true for all units that are "magic" and should be excluded from the usual
420 * start-up and shutdown dependencies. We call them "extrinsic" here, as they are generally
421 * mounted outside of the systemd dependency logic. We shouldn't attempt to manage them
422 * ourselves but it's fine if the user operates on them with us. */
423
424 /* We only automatically manage mounts if we are in system mode */
425 if (!MANAGER_IS_SYSTEM(UNIT(m)->manager))
426 return true;
427
428 if (UNIT(m)->perpetual) /* All perpetual units never change state */
429 return true;
430
431 p = get_mount_parameters(m);
432 if (p && fstab_is_extrinsic(m->where, p->options))
433 return true;
434
435 return false;
436 }
437
438 static int mount_add_default_ordering_dependencies(
439 Mount *m,
440 MountParameters *p,
441 UnitDependencyMask mask) {
442
443 const char *after, *before, *e;
444 int r;
445
446 assert(m);
447
448 e = path_startswith(m->where, "/sysroot");
449 if (e && in_initrd()) {
450 /* All mounts under /sysroot need to happen later, at initrd-fs.target time. IOW,
451 * it's not technically part of the basic initrd filesystem itself, and so
452 * shouldn't inherit the default Before=local-fs.target dependency. */
453
454 after = NULL;
455 before = isempty(e) ? SPECIAL_INITRD_ROOT_FS_TARGET : SPECIAL_INITRD_FS_TARGET;
456
457 } else if (mount_is_network(p)) {
458 after = SPECIAL_REMOTE_FS_PRE_TARGET;
459 before = SPECIAL_REMOTE_FS_TARGET;
460
461 } else {
462 after = SPECIAL_LOCAL_FS_PRE_TARGET;
463 before = SPECIAL_LOCAL_FS_TARGET;
464 }
465
466 if (!mount_is_nofail(m) && !mount_is_automount(p)) {
467 r = unit_add_dependency_by_name(UNIT(m), UNIT_BEFORE, before, true, mask);
468 if (r < 0)
469 return r;
470 }
471
472 if (after) {
473 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, true, mask);
474 if (r < 0)
475 return r;
476 }
477
478 return unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS,
479 SPECIAL_UMOUNT_TARGET, true, mask);
480 }
481
482 static int mount_add_default_dependencies(Mount *m) {
483 UnitDependencyMask mask;
484 MountParameters *p;
485 int r;
486
487 assert(m);
488
489 if (!UNIT(m)->default_dependencies)
490 return 0;
491
492 /* We do not add any default dependencies to /, /usr or /run/initramfs/, since they are
493 * guaranteed to stay mounted the whole time, since our system is on it. Also, don't
494 * bother with anything mounted below virtual file systems, it's also going to be virtual,
495 * and hence not worth the effort. */
496 if (mount_is_extrinsic(m))
497 return 0;
498
499 p = get_mount_parameters(m);
500 if (!p)
501 return 0;
502
503 mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_DEFAULT;
504
505 r = mount_add_default_ordering_dependencies(m, p, mask);
506 if (r < 0)
507 return r;
508
509 if (mount_is_network(p)) {
510 /* We order ourselves after network.target. This is primarily useful at shutdown:
511 * services that take down the network should order themselves before
512 * network.target, so that they are shut down only after this mount unit is
513 * stopped. */
514
515 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_NETWORK_TARGET, true, mask);
516 if (r < 0)
517 return r;
518
519 /* We pull in network-online.target, and order ourselves after it. This is useful
520 * at start-up to actively pull in tools that want to be started before we start
521 * mounting network file systems, and whose purpose it is to delay this until the
522 * network is "up". */
523
524 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_WANTS, UNIT_AFTER, SPECIAL_NETWORK_ONLINE_TARGET, true, mask);
525 if (r < 0)
526 return r;
527 }
528
529 /* If this is a tmpfs mount then we have to unmount it before we try to deactivate swaps */
530 if (streq_ptr(p->fstype, "tmpfs")) {
531 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_SWAP_TARGET, true, mask);
532 if (r < 0)
533 return r;
534 }
535
536 return 0;
537 }
538
539 static int mount_verify(Mount *m) {
540 _cleanup_free_ char *e = NULL;
541 MountParameters *p;
542 int r;
543
544 assert(m);
545 assert(UNIT(m)->load_state == UNIT_LOADED);
546
547 if (!m->from_fragment && !m->from_proc_self_mountinfo && !UNIT(m)->perpetual)
548 return -ENOENT;
549
550 r = unit_name_from_path(m->where, ".mount", &e);
551 if (r < 0)
552 return log_unit_error_errno(UNIT(m), r, "Failed to generate unit name from mount path: %m");
553
554 if (!unit_has_name(UNIT(m), e)) {
555 log_unit_error(UNIT(m), "Where= setting doesn't match unit name. Refusing.");
556 return -ENOEXEC;
557 }
558
559 if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
560 log_unit_error(UNIT(m), "Cannot create mount unit for API file system %s. Refusing.", m->where);
561 return -ENOEXEC;
562 }
563
564 p = get_mount_parameters_fragment(m);
565 if (p && !p->what && !UNIT(m)->perpetual)
566 return log_unit_error_errno(UNIT(m), SYNTHETIC_ERRNO(ENOEXEC),
567 "What= setting is missing. Refusing.");
568
569 if (m->exec_context.pam_name && m->kill_context.kill_mode != KILL_CONTROL_GROUP) {
570 log_unit_error(UNIT(m), "Unit has PAM enabled. Kill mode must be set to control-group'. Refusing.");
571 return -ENOEXEC;
572 }
573
574 return 0;
575 }
576
577 static int mount_add_non_exec_dependencies(Mount *m) {
578 int r;
579 assert(m);
580
581 /* Adds in all dependencies directly responsible for ordering the mount, as opposed to dependencies
582 * resulting from the ExecContext and such. */
583
584 r = mount_add_device_dependencies(m);
585 if (r < 0)
586 return r;
587
588 r = mount_add_mount_dependencies(m);
589 if (r < 0)
590 return r;
591
592 r = mount_add_quota_dependencies(m);
593 if (r < 0)
594 return r;
595
596 r = mount_add_default_dependencies(m);
597 if (r < 0)
598 return r;
599
600 return 0;
601 }
602
603 static int mount_add_extras(Mount *m) {
604 Unit *u = UNIT(m);
605 int r;
606
607 assert(m);
608
609 /* Note: this call might be called after we already have been loaded once (and even when it has already been
610 * activated), in case data from /proc/self/mountinfo has changed. This means all code here needs to be ready
611 * to run with an already set up unit. */
612
613 if (u->fragment_path)
614 m->from_fragment = true;
615
616 if (!m->where) {
617 r = unit_name_to_path(u->id, &m->where);
618 if (r < 0)
619 return r;
620 }
621
622 path_simplify(m->where, false);
623
624 if (!u->description) {
625 r = unit_set_description(u, m->where);
626 if (r < 0)
627 return r;
628 }
629
630 r = unit_patch_contexts(u);
631 if (r < 0)
632 return r;
633
634 r = unit_add_exec_dependencies(u, &m->exec_context);
635 if (r < 0)
636 return r;
637
638 r = unit_set_default_slice(u);
639 if (r < 0)
640 return r;
641
642 r = mount_add_non_exec_dependencies(m);
643 if (r < 0)
644 return r;
645
646 return 0;
647 }
648
649 static void mount_load_root_mount(Unit *u) {
650 assert(u);
651
652 if (!unit_has_name(u, SPECIAL_ROOT_MOUNT))
653 return;
654
655 u->perpetual = true;
656 u->default_dependencies = false;
657
658 /* The stdio/kmsg bridge socket is on /, in order to avoid a dep loop, don't use kmsg logging for -.mount */
659 MOUNT(u)->exec_context.std_output = EXEC_OUTPUT_NULL;
660 MOUNT(u)->exec_context.std_input = EXEC_INPUT_NULL;
661
662 if (!u->description)
663 u->description = strdup("Root Mount");
664 }
665
666 static int mount_load(Unit *u) {
667 Mount *m = MOUNT(u);
668 int r, q = 0;
669
670 assert(u);
671 assert(u->load_state == UNIT_STUB);
672
673 mount_load_root_mount(u);
674
675 bool fragment_optional = m->from_proc_self_mountinfo || u->perpetual;
676 r = unit_load_fragment_and_dropin(u, !fragment_optional);
677
678 /* Add in some extras. Note we do this in all cases (even if we failed to load the unit) when announced by the
679 * kernel, because we need some things to be set up no matter what when the kernel establishes a mount and thus
680 * we need to update the state in our unit to track it. After all, consider that we don't allow changing the
681 * 'slice' field for a unit once it is active. */
682 if (u->load_state == UNIT_LOADED || m->from_proc_self_mountinfo || u->perpetual)
683 q = mount_add_extras(m);
684
685 if (r < 0)
686 return r;
687 if (q < 0)
688 return q;
689 if (u->load_state != UNIT_LOADED)
690 return 0;
691
692 return mount_verify(m);
693 }
694
695 static void mount_set_state(Mount *m, MountState state) {
696 MountState old_state;
697 assert(m);
698
699 if (m->state != state)
700 bus_unit_send_pending_change_signal(UNIT(m), false);
701
702 old_state = m->state;
703 m->state = state;
704
705 if (!MOUNT_STATE_WITH_PROCESS(state)) {
706 m->timer_event_source = sd_event_source_unref(m->timer_event_source);
707 mount_unwatch_control_pid(m);
708 m->control_command = NULL;
709 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
710 }
711
712 if (state != old_state)
713 log_unit_debug(UNIT(m), "Changed %s -> %s", mount_state_to_string(old_state), mount_state_to_string(state));
714
715 unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state],
716 m->reload_result == MOUNT_SUCCESS ? 0 : UNIT_NOTIFY_RELOAD_FAILURE);
717 }
718
719 static int mount_coldplug(Unit *u) {
720 Mount *m = MOUNT(u);
721 MountState new_state = MOUNT_DEAD;
722 int r;
723
724 assert(m);
725 assert(m->state == MOUNT_DEAD);
726
727 if (m->deserialized_state != m->state)
728 new_state = m->deserialized_state;
729 else if (m->from_proc_self_mountinfo)
730 new_state = MOUNT_MOUNTED;
731
732 if (new_state == m->state)
733 return 0;
734
735 if (m->control_pid > 0 &&
736 pid_is_unwaited(m->control_pid) &&
737 MOUNT_STATE_WITH_PROCESS(new_state)) {
738
739 r = unit_watch_pid(UNIT(m), m->control_pid, false);
740 if (r < 0)
741 return r;
742
743 r = mount_arm_timer(m, usec_add(u->state_change_timestamp.monotonic, m->timeout_usec));
744 if (r < 0)
745 return r;
746 }
747
748 if (!IN_SET(new_state, MOUNT_DEAD, MOUNT_FAILED)) {
749 (void) unit_setup_dynamic_creds(u);
750 (void) unit_setup_exec_runtime(u);
751 }
752
753 mount_set_state(m, new_state);
754 return 0;
755 }
756
757 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
758 char buf[FORMAT_TIMESPAN_MAX];
759 Mount *m = MOUNT(u);
760 MountParameters *p;
761
762 assert(m);
763 assert(f);
764
765 p = get_mount_parameters(m);
766
767 fprintf(f,
768 "%sMount State: %s\n"
769 "%sResult: %s\n"
770 "%sClean Result: %s\n"
771 "%sWhere: %s\n"
772 "%sWhat: %s\n"
773 "%sFile System Type: %s\n"
774 "%sOptions: %s\n"
775 "%sFrom /proc/self/mountinfo: %s\n"
776 "%sFrom fragment: %s\n"
777 "%sExtrinsic: %s\n"
778 "%sDirectoryMode: %04o\n"
779 "%sSloppyOptions: %s\n"
780 "%sLazyUnmount: %s\n"
781 "%sForceUnmount: %s\n"
782 "%sReadWriteOnly: %s\n"
783 "%sTimeoutSec: %s\n",
784 prefix, mount_state_to_string(m->state),
785 prefix, mount_result_to_string(m->result),
786 prefix, mount_result_to_string(m->clean_result),
787 prefix, m->where,
788 prefix, p ? strna(p->what) : "n/a",
789 prefix, p ? strna(p->fstype) : "n/a",
790 prefix, p ? strna(p->options) : "n/a",
791 prefix, yes_no(m->from_proc_self_mountinfo),
792 prefix, yes_no(m->from_fragment),
793 prefix, yes_no(mount_is_extrinsic(m)),
794 prefix, m->directory_mode,
795 prefix, yes_no(m->sloppy_options),
796 prefix, yes_no(m->lazy_unmount),
797 prefix, yes_no(m->force_unmount),
798 prefix, yes_no(m->read_write_only),
799 prefix, format_timespan(buf, sizeof(buf), m->timeout_usec, USEC_PER_SEC));
800
801 if (m->control_pid > 0)
802 fprintf(f,
803 "%sControl PID: "PID_FMT"\n",
804 prefix, m->control_pid);
805
806 exec_context_dump(&m->exec_context, f, prefix);
807 kill_context_dump(&m->kill_context, f, prefix);
808 cgroup_context_dump(UNIT(m), f, prefix);
809 }
810
811 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
812
813 _cleanup_(exec_params_clear) ExecParameters exec_params = {
814 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
815 .stdin_fd = -1,
816 .stdout_fd = -1,
817 .stderr_fd = -1,
818 .exec_fd = -1,
819 };
820 pid_t pid;
821 int r;
822
823 assert(m);
824 assert(c);
825 assert(_pid);
826
827 r = unit_prepare_exec(UNIT(m));
828 if (r < 0)
829 return r;
830
831 r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
832 if (r < 0)
833 return r;
834
835 r = unit_set_exec_params(UNIT(m), &exec_params);
836 if (r < 0)
837 return r;
838
839 r = exec_spawn(UNIT(m),
840 c,
841 &m->exec_context,
842 &exec_params,
843 m->exec_runtime,
844 &m->dynamic_creds,
845 &pid);
846 if (r < 0)
847 return r;
848
849 r = unit_watch_pid(UNIT(m), pid, true);
850 if (r < 0)
851 return r;
852
853 *_pid = pid;
854
855 return 0;
856 }
857
858 static void mount_enter_dead(Mount *m, MountResult f) {
859 assert(m);
860
861 if (m->result == MOUNT_SUCCESS)
862 m->result = f;
863
864 unit_log_result(UNIT(m), m->result == MOUNT_SUCCESS, mount_result_to_string(m->result));
865 unit_warn_leftover_processes(UNIT(m), unit_log_leftover_process_stop);
866
867 mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD);
868
869 m->exec_runtime = exec_runtime_unref(m->exec_runtime, true);
870
871 unit_destroy_runtime_data(UNIT(m), &m->exec_context);
872
873 unit_unref_uid_gid(UNIT(m), true);
874
875 dynamic_creds_destroy(&m->dynamic_creds);
876
877 /* Any dependencies based on /proc/self/mountinfo are now stale */
878 unit_remove_dependencies(UNIT(m), UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
879 }
880
881 static void mount_enter_mounted(Mount *m, MountResult f) {
882 assert(m);
883
884 if (m->result == MOUNT_SUCCESS)
885 m->result = f;
886
887 mount_set_state(m, MOUNT_MOUNTED);
888 }
889
890 static void mount_enter_dead_or_mounted(Mount *m, MountResult f) {
891 assert(m);
892
893 /* Enter DEAD or MOUNTED state, depending on what the kernel currently says about the mount point. We use this
894 * whenever we executed an operation, so that our internal state reflects what the kernel says again, after all
895 * ultimately we just mirror the kernel's internal state on this. */
896
897 if (m->from_proc_self_mountinfo)
898 mount_enter_mounted(m, f);
899 else
900 mount_enter_dead(m, f);
901 }
902
903 static int state_to_kill_operation(MountState state) {
904 switch (state) {
905
906 case MOUNT_REMOUNTING_SIGTERM:
907 return KILL_RESTART;
908
909 case MOUNT_UNMOUNTING_SIGTERM:
910 return KILL_TERMINATE;
911
912 case MOUNT_REMOUNTING_SIGKILL:
913 case MOUNT_UNMOUNTING_SIGKILL:
914 return KILL_KILL;
915
916 default:
917 return _KILL_OPERATION_INVALID;
918 }
919 }
920
921 static void mount_enter_signal(Mount *m, MountState state, MountResult f) {
922 int r;
923
924 assert(m);
925
926 if (m->result == MOUNT_SUCCESS)
927 m->result = f;
928
929 r = unit_kill_context(
930 UNIT(m),
931 &m->kill_context,
932 state_to_kill_operation(state),
933 -1,
934 m->control_pid,
935 false);
936 if (r < 0)
937 goto fail;
938
939 if (r > 0) {
940 r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
941 if (r < 0)
942 goto fail;
943
944 mount_set_state(m, state);
945 } else if (state == MOUNT_REMOUNTING_SIGTERM && m->kill_context.send_sigkill)
946 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
947 else if (IN_SET(state, MOUNT_REMOUNTING_SIGTERM, MOUNT_REMOUNTING_SIGKILL))
948 mount_enter_mounted(m, MOUNT_SUCCESS);
949 else if (state == MOUNT_UNMOUNTING_SIGTERM && m->kill_context.send_sigkill)
950 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS);
951 else
952 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
953
954 return;
955
956 fail:
957 log_unit_warning_errno(UNIT(m), r, "Failed to kill processes: %m");
958 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
959 }
960
961 static void mount_enter_unmounting(Mount *m) {
962 int r;
963
964 assert(m);
965
966 /* Start counting our attempts */
967 if (!IN_SET(m->state,
968 MOUNT_UNMOUNTING,
969 MOUNT_UNMOUNTING_SIGTERM,
970 MOUNT_UNMOUNTING_SIGKILL))
971 m->n_retry_umount = 0;
972
973 m->control_command_id = MOUNT_EXEC_UNMOUNT;
974 m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
975
976 r = exec_command_set(m->control_command, UMOUNT_PATH, m->where, "-c", NULL);
977 if (r >= 0 && m->lazy_unmount)
978 r = exec_command_append(m->control_command, "-l", NULL);
979 if (r >= 0 && m->force_unmount)
980 r = exec_command_append(m->control_command, "-f", NULL);
981 if (r < 0)
982 goto fail;
983
984 mount_unwatch_control_pid(m);
985
986 r = mount_spawn(m, m->control_command, &m->control_pid);
987 if (r < 0)
988 goto fail;
989
990 mount_set_state(m, MOUNT_UNMOUNTING);
991
992 return;
993
994 fail:
995 log_unit_warning_errno(UNIT(m), r, "Failed to run 'umount' task: %m");
996 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
997 }
998
999 static void mount_enter_mounting(Mount *m) {
1000 int r;
1001 MountParameters *p;
1002
1003 assert(m);
1004
1005 r = unit_fail_if_noncanonical(UNIT(m), m->where);
1006 if (r < 0)
1007 goto fail;
1008
1009 (void) mkdir_p_label(m->where, m->directory_mode);
1010
1011 unit_warn_if_dir_nonempty(UNIT(m), m->where);
1012 unit_warn_leftover_processes(UNIT(m), unit_log_leftover_process_start);
1013
1014 m->control_command_id = MOUNT_EXEC_MOUNT;
1015 m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
1016
1017 /* Create the source directory for bind-mounts if needed */
1018 p = get_mount_parameters_fragment(m);
1019 if (p && mount_is_bind(p)) {
1020 r = mkdir_p_label(p->what, m->directory_mode);
1021 if (r < 0)
1022 log_unit_error_errno(UNIT(m), r, "Failed to make bind mount source '%s': %m", p->what);
1023 }
1024
1025 if (p) {
1026 _cleanup_free_ char *opts = NULL;
1027
1028 r = fstab_filter_options(p->options, "nofail\0" "noauto\0" "auto\0", NULL, NULL, &opts);
1029 if (r < 0)
1030 goto fail;
1031
1032 r = exec_command_set(m->control_command, MOUNT_PATH, p->what, m->where, NULL);
1033 if (r >= 0 && m->sloppy_options)
1034 r = exec_command_append(m->control_command, "-s", NULL);
1035 if (r >= 0 && m->read_write_only)
1036 r = exec_command_append(m->control_command, "-w", NULL);
1037 if (r >= 0 && p->fstype)
1038 r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
1039 if (r >= 0 && !isempty(opts))
1040 r = exec_command_append(m->control_command, "-o", opts, NULL);
1041 } else
1042 r = -ENOENT;
1043 if (r < 0)
1044 goto fail;
1045
1046 mount_unwatch_control_pid(m);
1047
1048 r = mount_spawn(m, m->control_command, &m->control_pid);
1049 if (r < 0)
1050 goto fail;
1051
1052 mount_set_state(m, MOUNT_MOUNTING);
1053
1054 return;
1055
1056 fail:
1057 log_unit_warning_errno(UNIT(m), r, "Failed to run 'mount' task: %m");
1058 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
1059 }
1060
1061 static void mount_set_reload_result(Mount *m, MountResult result) {
1062 assert(m);
1063
1064 /* Only store the first error we encounter */
1065 if (m->reload_result != MOUNT_SUCCESS)
1066 return;
1067
1068 m->reload_result = result;
1069 }
1070
1071 static void mount_enter_remounting(Mount *m) {
1072 int r;
1073 MountParameters *p;
1074
1075 assert(m);
1076
1077 /* Reset reload result when we are about to start a new remount operation */
1078 m->reload_result = MOUNT_SUCCESS;
1079
1080 m->control_command_id = MOUNT_EXEC_REMOUNT;
1081 m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
1082
1083 p = get_mount_parameters_fragment(m);
1084 if (p) {
1085 const char *o;
1086
1087 if (p->options)
1088 o = strjoina("remount,", p->options);
1089 else
1090 o = "remount";
1091
1092 r = exec_command_set(m->control_command, MOUNT_PATH,
1093 p->what, m->where,
1094 "-o", o, NULL);
1095 if (r >= 0 && m->sloppy_options)
1096 r = exec_command_append(m->control_command, "-s", NULL);
1097 if (r >= 0 && m->read_write_only)
1098 r = exec_command_append(m->control_command, "-w", NULL);
1099 if (r >= 0 && p->fstype)
1100 r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
1101 } else
1102 r = -ENOENT;
1103 if (r < 0)
1104 goto fail;
1105
1106 mount_unwatch_control_pid(m);
1107
1108 r = mount_spawn(m, m->control_command, &m->control_pid);
1109 if (r < 0)
1110 goto fail;
1111
1112 mount_set_state(m, MOUNT_REMOUNTING);
1113
1114 return;
1115
1116 fail:
1117 log_unit_warning_errno(UNIT(m), r, "Failed to run 'remount' task: %m");
1118 mount_set_reload_result(m, MOUNT_FAILURE_RESOURCES);
1119 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1120 }
1121
1122 static void mount_cycle_clear(Mount *m) {
1123 assert(m);
1124
1125 /* Clear all state we shall forget for this new cycle */
1126
1127 m->result = MOUNT_SUCCESS;
1128 m->reload_result = MOUNT_SUCCESS;
1129 exec_command_reset_status_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
1130 UNIT(m)->reset_accounting = true;
1131 }
1132
1133 static int mount_start(Unit *u) {
1134 Mount *m = MOUNT(u);
1135 int r;
1136
1137 assert(m);
1138
1139 /* We cannot fulfill this request right now, try again later
1140 * please! */
1141 if (IN_SET(m->state,
1142 MOUNT_UNMOUNTING,
1143 MOUNT_UNMOUNTING_SIGTERM,
1144 MOUNT_UNMOUNTING_SIGKILL,
1145 MOUNT_CLEANING))
1146 return -EAGAIN;
1147
1148 /* Already on it! */
1149 if (m->state == MOUNT_MOUNTING)
1150 return 0;
1151
1152 assert(IN_SET(m->state, MOUNT_DEAD, MOUNT_FAILED));
1153
1154 r = unit_test_start_limit(u);
1155 if (r < 0) {
1156 mount_enter_dead(m, MOUNT_FAILURE_START_LIMIT_HIT);
1157 return r;
1158 }
1159
1160 r = unit_acquire_invocation_id(u);
1161 if (r < 0)
1162 return r;
1163
1164 mount_cycle_clear(m);
1165 mount_enter_mounting(m);
1166
1167 return 1;
1168 }
1169
1170 static int mount_stop(Unit *u) {
1171 Mount *m = MOUNT(u);
1172
1173 assert(m);
1174
1175 switch (m->state) {
1176
1177 case MOUNT_UNMOUNTING:
1178 case MOUNT_UNMOUNTING_SIGKILL:
1179 case MOUNT_UNMOUNTING_SIGTERM:
1180 /* Already on it */
1181 return 0;
1182
1183 case MOUNT_MOUNTING:
1184 case MOUNT_MOUNTING_DONE:
1185 case MOUNT_REMOUNTING:
1186 /* If we are still waiting for /bin/mount, we go directly into kill mode. */
1187 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_SUCCESS);
1188 return 0;
1189
1190 case MOUNT_REMOUNTING_SIGTERM:
1191 /* If we are already waiting for a hung remount, convert this to the matching unmounting state */
1192 mount_set_state(m, MOUNT_UNMOUNTING_SIGTERM);
1193 return 0;
1194
1195 case MOUNT_REMOUNTING_SIGKILL:
1196 /* as above */
1197 mount_set_state(m, MOUNT_UNMOUNTING_SIGKILL);
1198 return 0;
1199
1200 case MOUNT_MOUNTED:
1201 mount_enter_unmounting(m);
1202 return 1;
1203
1204 case MOUNT_CLEANING:
1205 /* If we are currently cleaning, then abort it, brutally. */
1206 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS);
1207 return 0;
1208
1209 default:
1210 assert_not_reached("Unexpected state.");
1211 }
1212 }
1213
1214 static int mount_reload(Unit *u) {
1215 Mount *m = MOUNT(u);
1216
1217 assert(m);
1218 assert(m->state == MOUNT_MOUNTED);
1219
1220 mount_enter_remounting(m);
1221
1222 return 1;
1223 }
1224
1225 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
1226 Mount *m = MOUNT(u);
1227
1228 assert(m);
1229 assert(f);
1230 assert(fds);
1231
1232 (void) serialize_item(f, "state", mount_state_to_string(m->state));
1233 (void) serialize_item(f, "result", mount_result_to_string(m->result));
1234 (void) serialize_item(f, "reload-result", mount_result_to_string(m->reload_result));
1235 (void) serialize_item_format(f, "n-retry-umount", "%u", m->n_retry_umount);
1236
1237 if (m->control_pid > 0)
1238 (void) serialize_item_format(f, "control-pid", PID_FMT, m->control_pid);
1239
1240 if (m->control_command_id >= 0)
1241 (void) serialize_item(f, "control-command", mount_exec_command_to_string(m->control_command_id));
1242
1243 return 0;
1244 }
1245
1246 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1247 Mount *m = MOUNT(u);
1248 int r;
1249
1250 assert(u);
1251 assert(key);
1252 assert(value);
1253 assert(fds);
1254
1255 if (streq(key, "state")) {
1256 MountState state;
1257
1258 if ((state = mount_state_from_string(value)) < 0)
1259 log_unit_debug(u, "Failed to parse state value: %s", value);
1260 else
1261 m->deserialized_state = state;
1262
1263 } else if (streq(key, "result")) {
1264 MountResult f;
1265
1266 f = mount_result_from_string(value);
1267 if (f < 0)
1268 log_unit_debug(u, "Failed to parse result value: %s", value);
1269 else if (f != MOUNT_SUCCESS)
1270 m->result = f;
1271
1272 } else if (streq(key, "reload-result")) {
1273 MountResult f;
1274
1275 f = mount_result_from_string(value);
1276 if (f < 0)
1277 log_unit_debug(u, "Failed to parse reload result value: %s", value);
1278 else if (f != MOUNT_SUCCESS)
1279 m->reload_result = f;
1280
1281 } else if (streq(key, "n-retry-umount")) {
1282
1283 r = safe_atou(value, &m->n_retry_umount);
1284 if (r < 0)
1285 log_unit_debug(u, "Failed to parse n-retry-umount value: %s", value);
1286
1287 } else if (streq(key, "control-pid")) {
1288
1289 if (parse_pid(value, &m->control_pid) < 0)
1290 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
1291
1292 } else if (streq(key, "control-command")) {
1293 MountExecCommand id;
1294
1295 id = mount_exec_command_from_string(value);
1296 if (id < 0)
1297 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
1298 else {
1299 m->control_command_id = id;
1300 m->control_command = m->exec_command + id;
1301 }
1302 } else
1303 log_unit_debug(u, "Unknown serialization key: %s", key);
1304
1305 return 0;
1306 }
1307
1308 _pure_ static UnitActiveState mount_active_state(Unit *u) {
1309 assert(u);
1310
1311 return state_translation_table[MOUNT(u)->state];
1312 }
1313
1314 _pure_ static const char *mount_sub_state_to_string(Unit *u) {
1315 assert(u);
1316
1317 return mount_state_to_string(MOUNT(u)->state);
1318 }
1319
1320 _pure_ static bool mount_may_gc(Unit *u) {
1321 Mount *m = MOUNT(u);
1322
1323 assert(m);
1324
1325 if (m->from_proc_self_mountinfo)
1326 return false;
1327
1328 return true;
1329 }
1330
1331 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1332 Mount *m = MOUNT(u);
1333 MountResult f;
1334
1335 assert(m);
1336 assert(pid >= 0);
1337
1338 if (pid != m->control_pid)
1339 return;
1340
1341 /* So here's the thing, we really want to know before /usr/bin/mount or /usr/bin/umount exit whether
1342 * they established/remove a mount. This is important when mounting, but even more so when unmounting
1343 * since we need to deal with nested mounts and otherwise cannot safely determine whether to repeat
1344 * the unmounts. In theory, the kernel fires /proc/self/mountinfo changes off before returning from
1345 * the mount() or umount() syscalls, and thus we should see the changes to the proc file before we
1346 * process the waitid() for the /usr/bin/(u)mount processes. However, this is unfortunately racy: we
1347 * have to waitid() for processes using P_ALL (since we need to reap unexpected children that got
1348 * reparented to PID 1), but when using P_ALL we might end up reaping processes that terminated just
1349 * instants ago, i.e. already after our last event loop iteration (i.e. after the last point we might
1350 * have noticed /proc/self/mountinfo events via epoll). This means event loop priorities for
1351 * processing SIGCHLD vs. /proc/self/mountinfo IO events are not as relevant as we want. To fix that
1352 * race, let's explicitly scan /proc/self/mountinfo before we start processing /usr/bin/(u)mount
1353 * dying. It's ugly, but it makes our ordering systematic again, and makes sure we always see
1354 * /proc/self/mountinfo changes before our mount/umount exits. */
1355 (void) mount_process_proc_self_mountinfo(u->manager);
1356
1357 m->control_pid = 0;
1358
1359 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
1360 f = MOUNT_SUCCESS;
1361 else if (code == CLD_EXITED)
1362 f = MOUNT_FAILURE_EXIT_CODE;
1363 else if (code == CLD_KILLED)
1364 f = MOUNT_FAILURE_SIGNAL;
1365 else if (code == CLD_DUMPED)
1366 f = MOUNT_FAILURE_CORE_DUMP;
1367 else
1368 assert_not_reached("Unknown code");
1369
1370 if (IN_SET(m->state, MOUNT_REMOUNTING, MOUNT_REMOUNTING_SIGKILL, MOUNT_REMOUNTING_SIGTERM))
1371 mount_set_reload_result(m, f);
1372 else if (m->result == MOUNT_SUCCESS)
1373 m->result = f;
1374
1375 if (m->control_command) {
1376 exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status);
1377
1378 m->control_command = NULL;
1379 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1380 }
1381
1382 unit_log_process_exit(
1383 u,
1384 "Mount process",
1385 mount_exec_command_to_string(m->control_command_id),
1386 f == MOUNT_SUCCESS,
1387 code, status);
1388
1389 /* Note that due to the io event priority logic, we can be sure the new mountinfo is loaded
1390 * before we process the SIGCHLD for the mount command. */
1391
1392 switch (m->state) {
1393
1394 case MOUNT_MOUNTING:
1395 /* Our mount point has not appeared in mountinfo. Something went wrong. */
1396
1397 if (f == MOUNT_SUCCESS) {
1398 /* Either /bin/mount has an unexpected definition of success,
1399 * or someone raced us and we lost. */
1400 log_unit_warning(UNIT(m), "Mount process finished, but there is no mount.");
1401 f = MOUNT_FAILURE_PROTOCOL;
1402 }
1403 mount_enter_dead(m, f);
1404 break;
1405
1406 case MOUNT_MOUNTING_DONE:
1407 mount_enter_mounted(m, f);
1408 break;
1409
1410 case MOUNT_REMOUNTING:
1411 case MOUNT_REMOUNTING_SIGTERM:
1412 case MOUNT_REMOUNTING_SIGKILL:
1413 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1414 break;
1415
1416 case MOUNT_UNMOUNTING:
1417
1418 if (f == MOUNT_SUCCESS && m->from_proc_self_mountinfo) {
1419
1420 /* Still a mount point? If so, let's try again. Most likely there were multiple mount points
1421 * stacked on top of each other. We might exceed the timeout specified by the user overall,
1422 * but we will stop as soon as any one umount times out. */
1423
1424 if (m->n_retry_umount < RETRY_UMOUNT_MAX) {
1425 log_unit_debug(u, "Mount still present, trying again.");
1426 m->n_retry_umount++;
1427 mount_enter_unmounting(m);
1428 } else {
1429 log_unit_warning(u, "Mount still present after %u attempts to unmount, giving up.", m->n_retry_umount);
1430 mount_enter_mounted(m, f);
1431 }
1432 } else
1433 mount_enter_dead_or_mounted(m, f);
1434
1435 break;
1436
1437 case MOUNT_UNMOUNTING_SIGKILL:
1438 case MOUNT_UNMOUNTING_SIGTERM:
1439 mount_enter_dead_or_mounted(m, f);
1440 break;
1441
1442 case MOUNT_CLEANING:
1443 if (m->clean_result == MOUNT_SUCCESS)
1444 m->clean_result = f;
1445
1446 mount_enter_dead(m, MOUNT_SUCCESS);
1447 break;
1448
1449 default:
1450 assert_not_reached("Uh, control process died at wrong time.");
1451 }
1452
1453 /* Notify clients about changed exit status */
1454 unit_add_to_dbus_queue(u);
1455 }
1456
1457 static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
1458 Mount *m = MOUNT(userdata);
1459
1460 assert(m);
1461 assert(m->timer_event_source == source);
1462
1463 switch (m->state) {
1464
1465 case MOUNT_MOUNTING:
1466 case MOUNT_MOUNTING_DONE:
1467 log_unit_warning(UNIT(m), "Mounting timed out. Terminating.");
1468 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1469 break;
1470
1471 case MOUNT_REMOUNTING:
1472 log_unit_warning(UNIT(m), "Remounting timed out. Terminating remount process.");
1473 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1474 mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, MOUNT_SUCCESS);
1475 break;
1476
1477 case MOUNT_REMOUNTING_SIGTERM:
1478 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1479
1480 if (m->kill_context.send_sigkill) {
1481 log_unit_warning(UNIT(m), "Remounting timed out. Killing.");
1482 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
1483 } else {
1484 log_unit_warning(UNIT(m), "Remounting timed out. Skipping SIGKILL. Ignoring.");
1485 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1486 }
1487 break;
1488
1489 case MOUNT_REMOUNTING_SIGKILL:
1490 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1491
1492 log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
1493 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1494 break;
1495
1496 case MOUNT_UNMOUNTING:
1497 log_unit_warning(UNIT(m), "Unmounting timed out. Terminating.");
1498 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1499 break;
1500
1501 case MOUNT_UNMOUNTING_SIGTERM:
1502 if (m->kill_context.send_sigkill) {
1503 log_unit_warning(UNIT(m), "Mount process timed out. Killing.");
1504 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
1505 } else {
1506 log_unit_warning(UNIT(m), "Mount process timed out. Skipping SIGKILL. Ignoring.");
1507 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
1508 }
1509 break;
1510
1511 case MOUNT_UNMOUNTING_SIGKILL:
1512 log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
1513 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
1514 break;
1515
1516 case MOUNT_CLEANING:
1517 log_unit_warning(UNIT(m), "Cleaning timed out. killing.");
1518
1519 if (m->clean_result == MOUNT_SUCCESS)
1520 m->clean_result = MOUNT_FAILURE_TIMEOUT;
1521
1522 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, 0);
1523 break;
1524
1525 default:
1526 assert_not_reached("Timeout at wrong time.");
1527 }
1528
1529 return 0;
1530 }
1531
1532 static int mount_setup_new_unit(
1533 Manager *m,
1534 const char *name,
1535 const char *what,
1536 const char *where,
1537 const char *options,
1538 const char *fstype,
1539 MountProcFlags *ret_flags,
1540 Unit **ret) {
1541
1542 _cleanup_(unit_freep) Unit *u = NULL;
1543 int r;
1544
1545 assert(m);
1546 assert(name);
1547 assert(ret_flags);
1548 assert(ret);
1549
1550 r = unit_new_for_name(m, sizeof(Mount), name, &u);
1551 if (r < 0)
1552 return r;
1553
1554 r = free_and_strdup(&u->source_path, "/proc/self/mountinfo");
1555 if (r < 0)
1556 return r;
1557
1558 r = free_and_strdup(&MOUNT(u)->where, where);
1559 if (r < 0)
1560 return r;
1561
1562 r = update_parameters_proc_self_mountinfo(MOUNT(u), what, options, fstype);
1563 if (r < 0)
1564 return r;
1565
1566 /* This unit was generated because /proc/self/mountinfo reported it. Remember this, so that by the time we load
1567 * the unit file for it (and thus add in extra deps right after) we know what source to attributes the deps
1568 * to.*/
1569 MOUNT(u)->from_proc_self_mountinfo = true;
1570
1571 /* We have only allocated the stub now, let's enqueue this unit for loading now, so that everything else is
1572 * loaded in now. */
1573 unit_add_to_load_queue(u);
1574
1575 *ret_flags = MOUNT_PROC_IS_MOUNTED | MOUNT_PROC_JUST_MOUNTED | MOUNT_PROC_JUST_CHANGED;
1576 *ret = TAKE_PTR(u);
1577 return 0;
1578 }
1579
1580 static int mount_setup_existing_unit(
1581 Unit *u,
1582 const char *what,
1583 const char *where,
1584 const char *options,
1585 const char *fstype,
1586 MountProcFlags *ret_flags) {
1587
1588 int r;
1589
1590 assert(u);
1591 assert(ret_flags);
1592
1593 if (!MOUNT(u)->where) {
1594 MOUNT(u)->where = strdup(where);
1595 if (!MOUNT(u)->where)
1596 return -ENOMEM;
1597 }
1598
1599 /* In case we have multiple mounts established on the same mount point, let's merge flags set already
1600 * for the current unit. Note that the flags field is reset on each iteration of reading
1601 * /proc/self/mountinfo, hence we know for sure anything already set here is from the current
1602 * iteration and thus worthy of taking into account. */
1603 MountProcFlags flags =
1604 MOUNT(u)->proc_flags | MOUNT_PROC_IS_MOUNTED;
1605
1606 r = update_parameters_proc_self_mountinfo(MOUNT(u), what, options, fstype);
1607 if (r < 0)
1608 return r;
1609 if (r > 0)
1610 flags |= MOUNT_PROC_JUST_CHANGED;
1611
1612 /* There are two conditions when we consider a mount point just mounted: when we haven't seen it in
1613 * /proc/self/mountinfo before or when MOUNT_MOUNTING is our current state. Why bother with the
1614 * latter? Shouldn't that be covered by the former? No, during reload it is not because we might then
1615 * encounter a new /proc/self/mountinfo in combination with an old mount unit state (since it stems
1616 * from the serialized state), and need to catch up. Since we know that the MOUNT_MOUNTING state is
1617 * reached when we wait for the mount to appear we hence can assume that if we are in it, we are
1618 * actually seeing it established for the first time. */
1619 if (!MOUNT(u)->from_proc_self_mountinfo || MOUNT(u)->state == MOUNT_MOUNTING)
1620 flags |= MOUNT_PROC_JUST_MOUNTED;
1621
1622 MOUNT(u)->from_proc_self_mountinfo = true;
1623
1624 if (IN_SET(u->load_state, UNIT_NOT_FOUND, UNIT_BAD_SETTING, UNIT_ERROR)) {
1625 /* The unit was previously not found or otherwise not loaded. Now that the unit shows up in
1626 * /proc/self/mountinfo we should reconsider it this, hence set it to UNIT_LOADED. */
1627 u->load_state = UNIT_LOADED;
1628 u->load_error = 0;
1629
1630 flags |= MOUNT_PROC_JUST_CHANGED;
1631 }
1632
1633 if (FLAGS_SET(flags, MOUNT_PROC_JUST_CHANGED)) {
1634 /* If things changed, then make sure that all deps are regenerated. Let's
1635 * first remove all automatic deps, and then add in the new ones. */
1636
1637 unit_remove_dependencies(u, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
1638
1639 r = mount_add_non_exec_dependencies(MOUNT(u));
1640 if (r < 0)
1641 return r;
1642 }
1643
1644 *ret_flags = flags;
1645 return 0;
1646 }
1647
1648 static int mount_setup_unit(
1649 Manager *m,
1650 const char *what,
1651 const char *where,
1652 const char *options,
1653 const char *fstype,
1654 bool set_flags) {
1655
1656 _cleanup_free_ char *e = NULL;
1657 MountProcFlags flags;
1658 Unit *u;
1659 int r;
1660
1661 assert(m);
1662 assert(what);
1663 assert(where);
1664 assert(options);
1665 assert(fstype);
1666
1667 /* Ignore API mount points. They should never be referenced in
1668 * dependencies ever. */
1669 if (mount_point_is_api(where) || mount_point_ignore(where))
1670 return 0;
1671
1672 if (streq(fstype, "autofs"))
1673 return 0;
1674
1675 /* probably some kind of swap, ignore */
1676 if (!is_path(where))
1677 return 0;
1678
1679 /* Mount unit names have to be (like all other unit names) short enough to fit into file names. This
1680 * means there's a good chance that overly long mount point paths after mangling them to look like a
1681 * unit name would result in unit names we don't actually consider valid. This should be OK however
1682 * as such long mount point paths should not happen on regular systems — and if they appear
1683 * nonetheless they are generally synthesized by software, and thus managed by that other
1684 * software. Having such long names just means you cannot use systemd to manage those specific mount
1685 * points, which should be an OK restriction to make. After all we don't have to be able to manage
1686 * all mount points in the world — as long as we don't choke on them when we encounter them. */
1687 r = unit_name_from_path(where, ".mount", &e);
1688 if (r < 0) {
1689 static RateLimit rate_limit = { /* Let's log about this at warning level at most once every
1690 * 5s. Given that we generate this whenever we read the file
1691 * otherwise we probably shouldn't flood the logs with
1692 * this */
1693 .interval = 5 * USEC_PER_SEC,
1694 .burst = 1,
1695 };
1696
1697 return log_struct_errno(
1698 ratelimit_below(&rate_limit) ? LOG_WARNING : LOG_DEBUG, r,
1699 "MESSAGE_ID=" SD_MESSAGE_MOUNT_POINT_PATH_NOT_SUITABLE_STR,
1700 "MOUNT_POINT=%s", where,
1701 LOG_MESSAGE("Failed to generate valid unit name from path '%s', ignoring mount point: %m", where));
1702 }
1703
1704 u = manager_get_unit(m, e);
1705 if (u)
1706 r = mount_setup_existing_unit(u, what, where, options, fstype, &flags);
1707 else
1708 /* First time we see this mount point meaning that it's not been initiated by a mount unit but rather
1709 * by the sysadmin having called mount(8) directly. */
1710 r = mount_setup_new_unit(m, e, what, where, options, fstype, &flags, &u);
1711 if (r < 0)
1712 return log_warning_errno(r, "Failed to set up mount unit for '%s': %m", where);
1713
1714 /* If the mount changed properties or state, let's notify our clients */
1715 if (flags & (MOUNT_PROC_JUST_CHANGED|MOUNT_PROC_JUST_MOUNTED))
1716 unit_add_to_dbus_queue(u);
1717
1718 if (set_flags)
1719 MOUNT(u)->proc_flags = flags;
1720
1721 return 0;
1722 }
1723
1724 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1725 _cleanup_(mnt_free_tablep) struct libmnt_table *table = NULL;
1726 _cleanup_(mnt_free_iterp) struct libmnt_iter *iter = NULL;
1727 int r;
1728
1729 assert(m);
1730
1731 r = libmount_parse(NULL, NULL, &table, &iter);
1732 if (r < 0)
1733 return log_error_errno(r, "Failed to parse /proc/self/mountinfo: %m");
1734
1735 for (;;) {
1736 struct libmnt_fs *fs;
1737 const char *device, *path, *options, *fstype;
1738
1739 r = mnt_table_next_fs(table, iter, &fs);
1740 if (r == 1)
1741 break;
1742 if (r < 0)
1743 return log_error_errno(r, "Failed to get next entry from /proc/self/mountinfo: %m");
1744
1745 device = mnt_fs_get_source(fs);
1746 path = mnt_fs_get_target(fs);
1747 options = mnt_fs_get_options(fs);
1748 fstype = mnt_fs_get_fstype(fs);
1749
1750 if (!device || !path)
1751 continue;
1752
1753 device_found_node(m, device, DEVICE_FOUND_MOUNT, DEVICE_FOUND_MOUNT);
1754
1755 (void) mount_setup_unit(m, device, path, options, fstype, set_flags);
1756 }
1757
1758 return 0;
1759 }
1760
1761 static void mount_shutdown(Manager *m) {
1762 assert(m);
1763
1764 m->mount_event_source = sd_event_source_unref(m->mount_event_source);
1765
1766 mnt_unref_monitor(m->mount_monitor);
1767 m->mount_monitor = NULL;
1768 }
1769
1770 static int mount_get_timeout(Unit *u, usec_t *timeout) {
1771 Mount *m = MOUNT(u);
1772 usec_t t;
1773 int r;
1774
1775 if (!m->timer_event_source)
1776 return 0;
1777
1778 r = sd_event_source_get_time(m->timer_event_source, &t);
1779 if (r < 0)
1780 return r;
1781 if (t == USEC_INFINITY)
1782 return 0;
1783
1784 *timeout = t;
1785 return 1;
1786 }
1787
1788 static void mount_enumerate_perpetual(Manager *m) {
1789 Unit *u;
1790 int r;
1791
1792 assert(m);
1793
1794 /* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's
1795 * unconditionally synthesize it here and mark it as perpetual. */
1796
1797 u = manager_get_unit(m, SPECIAL_ROOT_MOUNT);
1798 if (!u) {
1799 r = unit_new_for_name(m, sizeof(Mount), SPECIAL_ROOT_MOUNT, &u);
1800 if (r < 0) {
1801 log_error_errno(r, "Failed to allocate the special " SPECIAL_ROOT_MOUNT " unit: %m");
1802 return;
1803 }
1804 }
1805
1806 u->perpetual = true;
1807 MOUNT(u)->deserialized_state = MOUNT_MOUNTED;
1808
1809 unit_add_to_load_queue(u);
1810 unit_add_to_dbus_queue(u);
1811 }
1812
1813 static bool mount_is_mounted(Mount *m) {
1814 assert(m);
1815
1816 return UNIT(m)->perpetual || FLAGS_SET(m->proc_flags, MOUNT_PROC_IS_MOUNTED);
1817 }
1818
1819 static void mount_enumerate(Manager *m) {
1820 int r;
1821
1822 assert(m);
1823
1824 mnt_init_debug(0);
1825
1826 if (!m->mount_monitor) {
1827 int fd;
1828
1829 m->mount_monitor = mnt_new_monitor();
1830 if (!m->mount_monitor) {
1831 log_oom();
1832 goto fail;
1833 }
1834
1835 r = mnt_monitor_enable_kernel(m->mount_monitor, 1);
1836 if (r < 0) {
1837 log_error_errno(r, "Failed to enable watching of kernel mount events: %m");
1838 goto fail;
1839 }
1840
1841 r = mnt_monitor_enable_userspace(m->mount_monitor, 1, NULL);
1842 if (r < 0) {
1843 log_error_errno(r, "Failed to enable watching of userspace mount events: %m");
1844 goto fail;
1845 }
1846
1847 /* mnt_unref_monitor() will close the fd */
1848 fd = r = mnt_monitor_get_fd(m->mount_monitor);
1849 if (r < 0) {
1850 log_error_errno(r, "Failed to acquire watch file descriptor: %m");
1851 goto fail;
1852 }
1853
1854 r = sd_event_add_io(m->event, &m->mount_event_source, fd, EPOLLIN, mount_dispatch_io, m);
1855 if (r < 0) {
1856 log_error_errno(r, "Failed to watch mount file descriptor: %m");
1857 goto fail;
1858 }
1859
1860 r = sd_event_source_set_priority(m->mount_event_source, SD_EVENT_PRIORITY_NORMAL-10);
1861 if (r < 0) {
1862 log_error_errno(r, "Failed to adjust mount watch priority: %m");
1863 goto fail;
1864 }
1865
1866 (void) sd_event_source_set_description(m->mount_event_source, "mount-monitor-dispatch");
1867 }
1868
1869 r = mount_load_proc_self_mountinfo(m, false);
1870 if (r < 0)
1871 goto fail;
1872
1873 return;
1874
1875 fail:
1876 mount_shutdown(m);
1877 }
1878
1879 static int drain_libmount(Manager *m) {
1880 bool rescan = false;
1881 int r;
1882
1883 assert(m);
1884
1885 /* Drain all events and verify that the event is valid.
1886 *
1887 * Note that libmount also monitors /run/mount mkdir if the directory does not exist yet. The mkdir
1888 * may generate event which is irrelevant for us.
1889 *
1890 * error: r < 0; valid: r == 0, false positive: r == 1 */
1891 do {
1892 r = mnt_monitor_next_change(m->mount_monitor, NULL, NULL);
1893 if (r < 0)
1894 return log_error_errno(r, "Failed to drain libmount events: %m");
1895 if (r == 0)
1896 rescan = true;
1897 } while (r == 0);
1898
1899 return rescan;
1900 }
1901
1902 static int mount_process_proc_self_mountinfo(Manager *m) {
1903 _cleanup_set_free_free_ Set *around = NULL, *gone = NULL;
1904 const char *what;
1905 Unit *u;
1906 int r;
1907
1908 assert(m);
1909
1910 r = drain_libmount(m);
1911 if (r <= 0)
1912 return r;
1913
1914 r = mount_load_proc_self_mountinfo(m, true);
1915 if (r < 0) {
1916 /* Reset flags, just in case, for later calls */
1917 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT])
1918 MOUNT(u)->proc_flags = 0;
1919
1920 return 0;
1921 }
1922
1923 manager_dispatch_load_queue(m);
1924
1925 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1926 Mount *mount = MOUNT(u);
1927
1928 if (!mount_is_mounted(mount)) {
1929
1930 /* A mount point is not around right now. It
1931 * might be gone, or might never have
1932 * existed. */
1933
1934 if (mount->from_proc_self_mountinfo &&
1935 mount->parameters_proc_self_mountinfo.what) {
1936
1937 /* Remember that this device might just have disappeared */
1938 if (set_ensure_allocated(&gone, &path_hash_ops) < 0 ||
1939 set_put_strdup(&gone, mount->parameters_proc_self_mountinfo.what) < 0)
1940 log_oom(); /* we don't care too much about OOM here... */
1941 }
1942
1943 mount->from_proc_self_mountinfo = false;
1944 assert_se(update_parameters_proc_self_mountinfo(mount, NULL, NULL, NULL) >= 0);
1945
1946 switch (mount->state) {
1947
1948 case MOUNT_MOUNTED:
1949 /* This has just been unmounted by somebody else, follow the state change. */
1950 mount_enter_dead(mount, MOUNT_SUCCESS);
1951 break;
1952
1953 default:
1954 break;
1955 }
1956
1957 } else if (mount->proc_flags & (MOUNT_PROC_JUST_MOUNTED|MOUNT_PROC_JUST_CHANGED)) {
1958
1959 /* A mount point was added or changed */
1960
1961 switch (mount->state) {
1962
1963 case MOUNT_DEAD:
1964 case MOUNT_FAILED:
1965
1966 /* This has just been mounted by somebody else, follow the state change, but let's
1967 * generate a new invocation ID for this implicitly and automatically. */
1968 (void) unit_acquire_invocation_id(u);
1969 mount_cycle_clear(mount);
1970 mount_enter_mounted(mount, MOUNT_SUCCESS);
1971 break;
1972
1973 case MOUNT_MOUNTING:
1974 mount_set_state(mount, MOUNT_MOUNTING_DONE);
1975 break;
1976
1977 default:
1978 /* Nothing really changed, but let's
1979 * issue an notification call
1980 * nonetheless, in case somebody is
1981 * waiting for this. (e.g. file system
1982 * ro/rw remounts.) */
1983 mount_set_state(mount, mount->state);
1984 break;
1985 }
1986 }
1987
1988 if (mount_is_mounted(mount) &&
1989 mount->from_proc_self_mountinfo &&
1990 mount->parameters_proc_self_mountinfo.what) {
1991 /* Track devices currently used */
1992
1993 if (set_ensure_allocated(&around, &path_hash_ops) < 0 ||
1994 set_put_strdup(&around, mount->parameters_proc_self_mountinfo.what) < 0)
1995 log_oom();
1996 }
1997
1998 /* Reset the flags for later calls */
1999 mount->proc_flags = 0;
2000 }
2001
2002 SET_FOREACH(what, gone) {
2003 if (set_contains(around, what))
2004 continue;
2005
2006 /* Let the device units know that the device is no longer mounted */
2007 device_found_node(m, what, 0, DEVICE_FOUND_MOUNT);
2008 }
2009
2010 return 0;
2011 }
2012
2013 static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2014 Manager *m = userdata;
2015
2016 assert(m);
2017 assert(revents & EPOLLIN);
2018
2019 return mount_process_proc_self_mountinfo(m);
2020 }
2021
2022 static void mount_reset_failed(Unit *u) {
2023 Mount *m = MOUNT(u);
2024
2025 assert(m);
2026
2027 if (m->state == MOUNT_FAILED)
2028 mount_set_state(m, MOUNT_DEAD);
2029
2030 m->result = MOUNT_SUCCESS;
2031 m->reload_result = MOUNT_SUCCESS;
2032 m->clean_result = MOUNT_SUCCESS;
2033 }
2034
2035 static int mount_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
2036 Mount *m = MOUNT(u);
2037
2038 assert(m);
2039
2040 return unit_kill_common(u, who, signo, -1, m->control_pid, error);
2041 }
2042
2043 static int mount_control_pid(Unit *u) {
2044 Mount *m = MOUNT(u);
2045
2046 assert(m);
2047
2048 return m->control_pid;
2049 }
2050
2051 static int mount_clean(Unit *u, ExecCleanMask mask) {
2052 _cleanup_strv_free_ char **l = NULL;
2053 Mount *m = MOUNT(u);
2054 int r;
2055
2056 assert(m);
2057 assert(mask != 0);
2058
2059 if (m->state != MOUNT_DEAD)
2060 return -EBUSY;
2061
2062 r = exec_context_get_clean_directories(&m->exec_context, u->manager->prefix, mask, &l);
2063 if (r < 0)
2064 return r;
2065
2066 if (strv_isempty(l))
2067 return -EUNATCH;
2068
2069 mount_unwatch_control_pid(m);
2070 m->clean_result = MOUNT_SUCCESS;
2071 m->control_command = NULL;
2072 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
2073
2074 r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->exec_context.timeout_clean_usec));
2075 if (r < 0)
2076 goto fail;
2077
2078 r = unit_fork_and_watch_rm_rf(u, l, &m->control_pid);
2079 if (r < 0)
2080 goto fail;
2081
2082 mount_set_state(m, MOUNT_CLEANING);
2083
2084 return 0;
2085
2086 fail:
2087 log_unit_warning_errno(u, r, "Failed to initiate cleaning: %m");
2088 m->clean_result = MOUNT_FAILURE_RESOURCES;
2089 m->timer_event_source = sd_event_source_unref(m->timer_event_source);
2090 return r;
2091 }
2092
2093 static int mount_can_clean(Unit *u, ExecCleanMask *ret) {
2094 Mount *m = MOUNT(u);
2095
2096 assert(m);
2097
2098 return exec_context_get_clean_mask(&m->exec_context, ret);
2099 }
2100
2101 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
2102 [MOUNT_EXEC_MOUNT] = "ExecMount",
2103 [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
2104 [MOUNT_EXEC_REMOUNT] = "ExecRemount",
2105 };
2106
2107 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
2108
2109 static const char* const mount_result_table[_MOUNT_RESULT_MAX] = {
2110 [MOUNT_SUCCESS] = "success",
2111 [MOUNT_FAILURE_RESOURCES] = "resources",
2112 [MOUNT_FAILURE_TIMEOUT] = "timeout",
2113 [MOUNT_FAILURE_EXIT_CODE] = "exit-code",
2114 [MOUNT_FAILURE_SIGNAL] = "signal",
2115 [MOUNT_FAILURE_CORE_DUMP] = "core-dump",
2116 [MOUNT_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
2117 [MOUNT_FAILURE_PROTOCOL] = "protocol",
2118 };
2119
2120 DEFINE_STRING_TABLE_LOOKUP(mount_result, MountResult);
2121
2122 const UnitVTable mount_vtable = {
2123 .object_size = sizeof(Mount),
2124 .exec_context_offset = offsetof(Mount, exec_context),
2125 .cgroup_context_offset = offsetof(Mount, cgroup_context),
2126 .kill_context_offset = offsetof(Mount, kill_context),
2127 .exec_runtime_offset = offsetof(Mount, exec_runtime),
2128 .dynamic_creds_offset = offsetof(Mount, dynamic_creds),
2129
2130 .sections =
2131 "Unit\0"
2132 "Mount\0"
2133 "Install\0",
2134 .private_section = "Mount",
2135
2136 .can_transient = true,
2137 .can_fail = true,
2138
2139 .init = mount_init,
2140 .load = mount_load,
2141 .done = mount_done,
2142
2143 .coldplug = mount_coldplug,
2144
2145 .dump = mount_dump,
2146
2147 .start = mount_start,
2148 .stop = mount_stop,
2149 .reload = mount_reload,
2150
2151 .kill = mount_kill,
2152 .clean = mount_clean,
2153 .can_clean = mount_can_clean,
2154
2155 .serialize = mount_serialize,
2156 .deserialize_item = mount_deserialize_item,
2157
2158 .active_state = mount_active_state,
2159 .sub_state_to_string = mount_sub_state_to_string,
2160
2161 .will_restart = unit_will_restart_default,
2162
2163 .may_gc = mount_may_gc,
2164
2165 .sigchld_event = mount_sigchld_event,
2166
2167 .reset_failed = mount_reset_failed,
2168
2169 .control_pid = mount_control_pid,
2170
2171 .bus_set_property = bus_mount_set_property,
2172 .bus_commit_properties = bus_mount_commit_properties,
2173
2174 .get_timeout = mount_get_timeout,
2175
2176 .enumerate_perpetual = mount_enumerate_perpetual,
2177 .enumerate = mount_enumerate,
2178 .shutdown = mount_shutdown,
2179
2180 .status_message_formats = {
2181 .starting_stopping = {
2182 [0] = "Mounting %s...",
2183 [1] = "Unmounting %s...",
2184 },
2185 .finished_start_job = {
2186 [JOB_DONE] = "Mounted %s.",
2187 [JOB_FAILED] = "Failed to mount %s.",
2188 [JOB_TIMEOUT] = "Timed out mounting %s.",
2189 },
2190 .finished_stop_job = {
2191 [JOB_DONE] = "Unmounted %s.",
2192 [JOB_FAILED] = "Failed unmounting %s.",
2193 [JOB_TIMEOUT] = "Timed out unmounting %s.",
2194 },
2195 },
2196 };
Unnamed repository; edit this file 'description' to name the repository.