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