]> 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
mount/generators: do not make unit wanted by its device unit
[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 update_parameters_proc_self_mount_info(
255 Mount *m,
256 const char *what,
257 const char *options,
258 const char *fstype) {
259
260 MountParameters *p;
261 int r, q, w;
262
263 p = &m->parameters_proc_self_mountinfo;
264
265 r = free_and_strdup(&p->what, what);
266 if (r < 0)
267 return r;
268
269 q = free_and_strdup(&p->options, options);
270 if (q < 0)
271 return q;
272
273 w = free_and_strdup(&p->fstype, fstype);
274 if (w < 0)
275 return w;
276
277 return r > 0 || q > 0 || w > 0;
278 }
279
280 static int mount_add_mount_dependencies(Mount *m) {
281 MountParameters *pm;
282 Unit *other;
283 Iterator i;
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, i) {
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,
362 * but just a path the kernel exports for the root file system
363 * specified on the kernel command line. Ignore it here. */
364 if (path_equal(p->what, "/dev/root"))
365 return 0;
366
367 if (path_equal(m->where, "/"))
368 return 0;
369
370 /* Mount units from /proc/self/mountinfo are not bound to devices
371 * by default since they're subject to races when devices are
372 * unplugged. But the user can still force this dep with an
373 * appropriate option (or udev property) so the mount units are
374 * automatically stopped when the device disappears suddenly. */
375 dep = mount_is_bound_to_device(m) ? UNIT_BINDS_TO : UNIT_REQUIRES;
376
377 /* We always use 'what' from /proc/self/mountinfo if mounted */
378 mask = m->from_proc_self_mountinfo ? UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT : UNIT_DEPENDENCY_FILE;
379
380 r = unit_add_node_dependency(UNIT(m), p->what, false, dep, mask);
381 if (r < 0)
382 return r;
383
384 return 0;
385 }
386
387 static int mount_add_quota_dependencies(Mount *m) {
388 UnitDependencyMask mask;
389 MountParameters *p;
390 int r;
391
392 assert(m);
393
394 if (!MANAGER_IS_SYSTEM(UNIT(m)->manager))
395 return 0;
396
397 p = get_mount_parameters_fragment(m);
398 if (!p)
399 return 0;
400
401 if (!mount_needs_quota(p))
402 return 0;
403
404 mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT;
405
406 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, true, mask);
407 if (r < 0)
408 return r;
409
410 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, true, mask);
411 if (r < 0)
412 return r;
413
414 return 0;
415 }
416
417 static bool mount_is_extrinsic(Mount *m) {
418 MountParameters *p;
419 assert(m);
420
421 /* Returns true for all units that are "magic" and should be excluded from the usual start-up and shutdown
422 * dependencies. We call them "extrinsic" here, as they are generally mounted outside of the systemd dependency
423 * logic. We shouldn't attempt to manage them ourselves but it's fine if the user operates on them with us. */
424
425 if (!MANAGER_IS_SYSTEM(UNIT(m)->manager)) /* We only automatically manage mounts if we are in system mode */
426 return true;
427
428 if (PATH_IN_SET(m->where, /* Don't bother with the OS data itself */
429 "/",
430 "/usr"))
431 return true;
432
433 if (PATH_STARTSWITH_SET(m->where,
434 "/run/initramfs", /* This should stay around from before we boot until after we shutdown */
435 "/proc", /* All of this is API VFS */
436 "/sys", /* … dito … */
437 "/dev")) /* … dito … */
438 return true;
439
440 /* If this is an initrd mount, and we are not in the initrd, then leave this around forever, too. */
441 p = get_mount_parameters(m);
442 if (p && fstab_test_option(p->options, "x-initrd.mount\0") && !in_initrd())
443 return true;
444
445 return false;
446 }
447
448 static int mount_add_default_dependencies(Mount *m) {
449 const char *after, *before;
450 UnitDependencyMask mask;
451 MountParameters *p;
452 bool nofail;
453 int r;
454
455 assert(m);
456
457 if (!UNIT(m)->default_dependencies)
458 return 0;
459
460 /* We do not add any default dependencies to /, /usr or /run/initramfs/, since they are guaranteed to stay
461 * mounted the whole time, since our system is on it. Also, don't bother with anything mounted below virtual
462 * file systems, it's also going to be virtual, and hence not worth the effort. */
463 if (mount_is_extrinsic(m))
464 return 0;
465
466 p = get_mount_parameters(m);
467 if (!p)
468 return 0;
469
470 mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_DEFAULT;
471 nofail = m->from_fragment ? fstab_test_yes_no_option(m->parameters_fragment.options, "nofail\0" "fail\0") : false;
472
473 if (mount_is_network(p)) {
474 /* We order ourselves after network.target. This is
475 * primarily useful at shutdown: services that take
476 * down the network should order themselves before
477 * network.target, so that they are shut down only
478 * after this mount unit is stopped. */
479
480 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_NETWORK_TARGET, true, mask);
481 if (r < 0)
482 return r;
483
484 /* We pull in network-online.target, and order
485 * ourselves after it. This is useful at start-up to
486 * actively pull in tools that want to be started
487 * before we start mounting network file systems, and
488 * whose purpose it is to delay this until the network
489 * is "up". */
490
491 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_WANTS, UNIT_AFTER, SPECIAL_NETWORK_ONLINE_TARGET, true, mask);
492 if (r < 0)
493 return r;
494
495 after = SPECIAL_REMOTE_FS_PRE_TARGET;
496 before = SPECIAL_REMOTE_FS_TARGET;
497 } else {
498 after = SPECIAL_LOCAL_FS_PRE_TARGET;
499 before = SPECIAL_LOCAL_FS_TARGET;
500 }
501
502 if (!nofail) {
503 r = unit_add_dependency_by_name(UNIT(m), UNIT_BEFORE, before, true, mask);
504 if (r < 0)
505 return r;
506 }
507
508 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, true, mask);
509 if (r < 0)
510 return r;
511
512 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, true, mask);
513 if (r < 0)
514 return r;
515
516 /* If this is a tmpfs mount then we have to unmount it before we try to deactivate swaps */
517 if (streq_ptr(p->fstype, "tmpfs")) {
518 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_SWAP_TARGET, true, mask);
519 if (r < 0)
520 return r;
521 }
522
523 return 0;
524 }
525
526 static int mount_verify(Mount *m) {
527 _cleanup_free_ char *e = NULL;
528 MountParameters *p;
529 int r;
530
531 assert(m);
532
533 if (UNIT(m)->load_state != UNIT_LOADED)
534 return 0;
535
536 if (!m->from_fragment && !m->from_proc_self_mountinfo && !UNIT(m)->perpetual)
537 return -ENOENT;
538
539 r = unit_name_from_path(m->where, ".mount", &e);
540 if (r < 0)
541 return log_unit_error_errno(UNIT(m), r, "Failed to generate unit name from mount path: %m");
542
543 if (!unit_has_name(UNIT(m), e)) {
544 log_unit_error(UNIT(m), "Where= setting doesn't match unit name. Refusing.");
545 return -ENOEXEC;
546 }
547
548 if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
549 log_unit_error(UNIT(m), "Cannot create mount unit for API file system %s. Refusing.", m->where);
550 return -ENOEXEC;
551 }
552
553 p = get_mount_parameters_fragment(m);
554 if (p && !p->what) {
555 log_unit_error(UNIT(m), "What= setting is missing. Refusing.");
556 return -ENOEXEC;
557 }
558
559 if (m->exec_context.pam_name && m->kill_context.kill_mode != KILL_CONTROL_GROUP) {
560 log_unit_error(UNIT(m), "Unit has PAM enabled. Kill mode must be set to control-group'. Refusing.");
561 return -ENOEXEC;
562 }
563
564 return 0;
565 }
566
567 static int mount_add_extras(Mount *m) {
568 Unit *u = UNIT(m);
569 int r;
570
571 assert(m);
572
573 /* Note: this call might be called after we already have been loaded once (and even when it has already been
574 * activated), in case data from /proc/self/mountinfo has changed. This means all code here needs to be ready
575 * to run with an already set up unit. */
576
577 if (u->fragment_path)
578 m->from_fragment = true;
579
580 if (!m->where) {
581 r = unit_name_to_path(u->id, &m->where);
582 if (r < 0)
583 return r;
584 }
585
586 path_simplify(m->where, false);
587
588 if (!u->description) {
589 r = unit_set_description(u, m->where);
590 if (r < 0)
591 return r;
592 }
593
594 r = mount_add_device_dependencies(m);
595 if (r < 0)
596 return r;
597
598 r = mount_add_mount_dependencies(m);
599 if (r < 0)
600 return r;
601
602 r = mount_add_quota_dependencies(m);
603 if (r < 0)
604 return r;
605
606 r = unit_patch_contexts(u);
607 if (r < 0)
608 return r;
609
610 r = unit_add_exec_dependencies(u, &m->exec_context);
611 if (r < 0)
612 return r;
613
614 r = unit_set_default_slice(u);
615 if (r < 0)
616 return r;
617
618 r = mount_add_default_dependencies(m);
619 if (r < 0)
620 return r;
621
622 return 0;
623 }
624
625 static int mount_load_root_mount(Unit *u) {
626 assert(u);
627
628 if (!unit_has_name(u, SPECIAL_ROOT_MOUNT))
629 return 0;
630
631 u->perpetual = true;
632 u->default_dependencies = false;
633
634 /* The stdio/kmsg bridge socket is on /, in order to avoid a dep loop, don't use kmsg logging for -.mount */
635 MOUNT(u)->exec_context.std_output = EXEC_OUTPUT_NULL;
636 MOUNT(u)->exec_context.std_input = EXEC_INPUT_NULL;
637
638 if (!u->description)
639 u->description = strdup("Root Mount");
640
641 return 1;
642 }
643
644 static int mount_load(Unit *u) {
645 Mount *m = MOUNT(u);
646 int r, q, w;
647
648 assert(u);
649 assert(u->load_state == UNIT_STUB);
650
651 r = mount_load_root_mount(u);
652
653 if (m->from_proc_self_mountinfo || u->perpetual)
654 q = unit_load_fragment_and_dropin_optional(u);
655 else
656 q = unit_load_fragment_and_dropin(u);
657
658 /* Add in some extras. Note we do this in all cases (even if we failed to load the unit) when announced by the
659 * kernel, because we need some things to be set up no matter what when the kernel establishes a mount and thus
660 * we need to update the state in our unit to track it. After all, consider that we don't allow changing the
661 * 'slice' field for a unit once it is active. */
662 if (u->load_state == UNIT_LOADED || m->from_proc_self_mountinfo || u->perpetual)
663 w = mount_add_extras(m);
664 else
665 w = 0;
666
667 if (r < 0)
668 return r;
669 if (q < 0)
670 return q;
671 if (w < 0)
672 return w;
673
674 return mount_verify(m);
675 }
676
677 static void mount_set_state(Mount *m, MountState state) {
678 MountState old_state;
679 assert(m);
680
681 if (m->state != state)
682 bus_unit_send_pending_change_signal(UNIT(m), false);
683
684 old_state = m->state;
685 m->state = state;
686
687 if (!MOUNT_STATE_WITH_PROCESS(state)) {
688 m->timer_event_source = sd_event_source_unref(m->timer_event_source);
689 mount_unwatch_control_pid(m);
690 m->control_command = NULL;
691 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
692 }
693
694 if (state != old_state)
695 log_unit_debug(UNIT(m), "Changed %s -> %s", mount_state_to_string(old_state), mount_state_to_string(state));
696
697 unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state],
698 m->reload_result == MOUNT_SUCCESS ? 0 : UNIT_NOTIFY_RELOAD_FAILURE);
699 }
700
701 static int mount_coldplug(Unit *u) {
702 Mount *m = MOUNT(u);
703 MountState new_state = MOUNT_DEAD;
704 int r;
705
706 assert(m);
707 assert(m->state == MOUNT_DEAD);
708
709 if (m->deserialized_state != m->state)
710 new_state = m->deserialized_state;
711 else if (m->from_proc_self_mountinfo)
712 new_state = MOUNT_MOUNTED;
713
714 if (new_state == m->state)
715 return 0;
716
717 if (m->control_pid > 0 &&
718 pid_is_unwaited(m->control_pid) &&
719 MOUNT_STATE_WITH_PROCESS(new_state)) {
720
721 r = unit_watch_pid(UNIT(m), m->control_pid);
722 if (r < 0)
723 return r;
724
725 r = mount_arm_timer(m, usec_add(u->state_change_timestamp.monotonic, m->timeout_usec));
726 if (r < 0)
727 return r;
728 }
729
730 if (!IN_SET(new_state, MOUNT_DEAD, MOUNT_FAILED)) {
731 (void) unit_setup_dynamic_creds(u);
732 (void) unit_setup_exec_runtime(u);
733 }
734
735 mount_set_state(m, new_state);
736 return 0;
737 }
738
739 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
740 char buf[FORMAT_TIMESPAN_MAX];
741 Mount *m = MOUNT(u);
742 MountParameters *p;
743
744 assert(m);
745 assert(f);
746
747 p = get_mount_parameters(m);
748
749 fprintf(f,
750 "%sMount State: %s\n"
751 "%sResult: %s\n"
752 "%sWhere: %s\n"
753 "%sWhat: %s\n"
754 "%sFile System Type: %s\n"
755 "%sOptions: %s\n"
756 "%sFrom /proc/self/mountinfo: %s\n"
757 "%sFrom fragment: %s\n"
758 "%sExtrinsic: %s\n"
759 "%sDirectoryMode: %04o\n"
760 "%sSloppyOptions: %s\n"
761 "%sLazyUnmount: %s\n"
762 "%sForceUnmount: %s\n"
763 "%sTimeoutSec: %s\n",
764 prefix, mount_state_to_string(m->state),
765 prefix, mount_result_to_string(m->result),
766 prefix, m->where,
767 prefix, p ? strna(p->what) : "n/a",
768 prefix, p ? strna(p->fstype) : "n/a",
769 prefix, p ? strna(p->options) : "n/a",
770 prefix, yes_no(m->from_proc_self_mountinfo),
771 prefix, yes_no(m->from_fragment),
772 prefix, yes_no(mount_is_extrinsic(m)),
773 prefix, m->directory_mode,
774 prefix, yes_no(m->sloppy_options),
775 prefix, yes_no(m->lazy_unmount),
776 prefix, yes_no(m->force_unmount),
777 prefix, format_timespan(buf, sizeof(buf), m->timeout_usec, USEC_PER_SEC));
778
779 if (m->control_pid > 0)
780 fprintf(f,
781 "%sControl PID: "PID_FMT"\n",
782 prefix, m->control_pid);
783
784 exec_context_dump(&m->exec_context, f, prefix);
785 kill_context_dump(&m->kill_context, f, prefix);
786 cgroup_context_dump(&m->cgroup_context, f, prefix);
787 }
788
789 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
790
791 _cleanup_(exec_params_clear) ExecParameters exec_params = {
792 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
793 .stdin_fd = -1,
794 .stdout_fd = -1,
795 .stderr_fd = -1,
796 .exec_fd = -1,
797 };
798 pid_t pid;
799 int r;
800
801 assert(m);
802 assert(c);
803 assert(_pid);
804
805 r = unit_prepare_exec(UNIT(m));
806 if (r < 0)
807 return r;
808
809 r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
810 if (r < 0)
811 return r;
812
813 r = unit_set_exec_params(UNIT(m), &exec_params);
814 if (r < 0)
815 return r;
816
817 r = exec_spawn(UNIT(m),
818 c,
819 &m->exec_context,
820 &exec_params,
821 m->exec_runtime,
822 &m->dynamic_creds,
823 &pid);
824 if (r < 0)
825 return r;
826
827 r = unit_watch_pid(UNIT(m), pid);
828 if (r < 0)
829 /* FIXME: we need to do something here */
830 return r;
831
832 *_pid = pid;
833
834 return 0;
835 }
836
837 static void mount_enter_dead(Mount *m, MountResult f) {
838 assert(m);
839
840 if (m->result == MOUNT_SUCCESS)
841 m->result = f;
842
843 unit_log_result(UNIT(m), m->result == MOUNT_SUCCESS, mount_result_to_string(m->result));
844 mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD);
845
846 m->exec_runtime = exec_runtime_unref(m->exec_runtime, true);
847
848 exec_context_destroy_runtime_directory(&m->exec_context, UNIT(m)->manager->prefix[EXEC_DIRECTORY_RUNTIME]);
849
850 unit_unref_uid_gid(UNIT(m), true);
851
852 dynamic_creds_destroy(&m->dynamic_creds);
853
854 /* Any dependencies based on /proc/self/mountinfo are now stale */
855 unit_remove_dependencies(UNIT(m), UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
856 }
857
858 static void mount_enter_mounted(Mount *m, MountResult f) {
859 assert(m);
860
861 if (m->result == MOUNT_SUCCESS)
862 m->result = f;
863
864 mount_set_state(m, MOUNT_MOUNTED);
865 }
866
867 static void mount_enter_dead_or_mounted(Mount *m, MountResult f) {
868 assert(m);
869
870 /* Enter DEAD or MOUNTED state, depending on what the kernel currently says about the mount point. We use this
871 * whenever we executed an operation, so that our internal state reflects what the kernel says again, after all
872 * ultimately we just mirror the kernel's internal state on this. */
873
874 if (m->from_proc_self_mountinfo)
875 mount_enter_mounted(m, f);
876 else
877 mount_enter_dead(m, f);
878 }
879
880 static int state_to_kill_operation(MountState state) {
881 switch (state) {
882
883 case MOUNT_REMOUNTING_SIGTERM:
884 case MOUNT_UNMOUNTING_SIGTERM:
885 return KILL_TERMINATE;
886
887 case MOUNT_REMOUNTING_SIGKILL:
888 case MOUNT_UNMOUNTING_SIGKILL:
889 return KILL_KILL;
890
891 default:
892 return _KILL_OPERATION_INVALID;
893 }
894 }
895
896 static void mount_enter_signal(Mount *m, MountState state, MountResult f) {
897 int r;
898
899 assert(m);
900
901 if (m->result == MOUNT_SUCCESS)
902 m->result = f;
903
904 r = unit_kill_context(
905 UNIT(m),
906 &m->kill_context,
907 state_to_kill_operation(state),
908 -1,
909 m->control_pid,
910 false);
911 if (r < 0)
912 goto fail;
913
914 if (r > 0) {
915 r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
916 if (r < 0)
917 goto fail;
918
919 mount_set_state(m, state);
920 } else if (state == MOUNT_REMOUNTING_SIGTERM && m->kill_context.send_sigkill)
921 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
922 else if (IN_SET(state, MOUNT_REMOUNTING_SIGTERM, MOUNT_REMOUNTING_SIGKILL))
923 mount_enter_mounted(m, MOUNT_SUCCESS);
924 else if (state == MOUNT_UNMOUNTING_SIGTERM && m->kill_context.send_sigkill)
925 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS);
926 else
927 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
928
929 return;
930
931 fail:
932 log_unit_warning_errno(UNIT(m), r, "Failed to kill processes: %m");
933 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
934 }
935
936 static void mount_enter_unmounting(Mount *m) {
937 int r;
938
939 assert(m);
940
941 /* Start counting our attempts */
942 if (!IN_SET(m->state,
943 MOUNT_UNMOUNTING,
944 MOUNT_UNMOUNTING_SIGTERM,
945 MOUNT_UNMOUNTING_SIGKILL))
946 m->n_retry_umount = 0;
947
948 m->control_command_id = MOUNT_EXEC_UNMOUNT;
949 m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
950
951 r = exec_command_set(m->control_command, UMOUNT_PATH, m->where, "-c", NULL);
952 if (r >= 0 && m->lazy_unmount)
953 r = exec_command_append(m->control_command, "-l", NULL);
954 if (r >= 0 && m->force_unmount)
955 r = exec_command_append(m->control_command, "-f", NULL);
956 if (r < 0)
957 goto fail;
958
959 mount_unwatch_control_pid(m);
960
961 r = mount_spawn(m, m->control_command, &m->control_pid);
962 if (r < 0)
963 goto fail;
964
965 mount_set_state(m, MOUNT_UNMOUNTING);
966
967 return;
968
969 fail:
970 log_unit_warning_errno(UNIT(m), r, "Failed to run 'umount' task: %m");
971 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
972 }
973
974 static void mount_enter_mounting(Mount *m) {
975 int r;
976 MountParameters *p;
977
978 assert(m);
979
980 r = unit_fail_if_noncanonical(UNIT(m), m->where);
981 if (r < 0)
982 goto fail;
983
984 (void) mkdir_p_label(m->where, m->directory_mode);
985
986 unit_warn_if_dir_nonempty(UNIT(m), m->where);
987 unit_warn_leftover_processes(UNIT(m));
988
989 m->control_command_id = MOUNT_EXEC_MOUNT;
990 m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
991
992 /* Create the source directory for bind-mounts if needed */
993 p = get_mount_parameters_fragment(m);
994 if (p && mount_is_bind(p))
995 (void) mkdir_p_label(p->what, m->directory_mode);
996
997 if (p) {
998 _cleanup_free_ char *opts = NULL;
999
1000 r = fstab_filter_options(p->options, "nofail\0" "noauto\0" "auto\0", NULL, NULL, &opts);
1001 if (r < 0)
1002 goto fail;
1003
1004 r = exec_command_set(m->control_command, MOUNT_PATH, p->what, m->where, NULL);
1005 if (r >= 0 && m->sloppy_options)
1006 r = exec_command_append(m->control_command, "-s", NULL);
1007 if (r >= 0 && p->fstype)
1008 r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
1009 if (r >= 0 && !isempty(opts))
1010 r = exec_command_append(m->control_command, "-o", opts, NULL);
1011 } else
1012 r = -ENOENT;
1013 if (r < 0)
1014 goto fail;
1015
1016 mount_unwatch_control_pid(m);
1017
1018 r = mount_spawn(m, m->control_command, &m->control_pid);
1019 if (r < 0)
1020 goto fail;
1021
1022 mount_set_state(m, MOUNT_MOUNTING);
1023
1024 return;
1025
1026 fail:
1027 log_unit_warning_errno(UNIT(m), r, "Failed to run 'mount' task: %m");
1028 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
1029 }
1030
1031 static void mount_set_reload_result(Mount *m, MountResult result) {
1032 assert(m);
1033
1034 /* Only store the first error we encounter */
1035 if (m->reload_result != MOUNT_SUCCESS)
1036 return;
1037
1038 m->reload_result = result;
1039 }
1040
1041 static void mount_enter_remounting(Mount *m) {
1042 int r;
1043 MountParameters *p;
1044
1045 assert(m);
1046
1047 /* Reset reload result when we are about to start a new remount operation */
1048 m->reload_result = MOUNT_SUCCESS;
1049
1050 m->control_command_id = MOUNT_EXEC_REMOUNT;
1051 m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
1052
1053 p = get_mount_parameters_fragment(m);
1054 if (p) {
1055 const char *o;
1056
1057 if (p->options)
1058 o = strjoina("remount,", p->options);
1059 else
1060 o = "remount";
1061
1062 r = exec_command_set(m->control_command, MOUNT_PATH,
1063 p->what, m->where,
1064 "-o", o, NULL);
1065 if (r >= 0 && m->sloppy_options)
1066 r = exec_command_append(m->control_command, "-s", NULL);
1067 if (r >= 0 && p->fstype)
1068 r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
1069 } else
1070 r = -ENOENT;
1071 if (r < 0)
1072 goto fail;
1073
1074 mount_unwatch_control_pid(m);
1075
1076 r = mount_spawn(m, m->control_command, &m->control_pid);
1077 if (r < 0)
1078 goto fail;
1079
1080 mount_set_state(m, MOUNT_REMOUNTING);
1081
1082 return;
1083
1084 fail:
1085 log_unit_warning_errno(UNIT(m), r, "Failed to run 'remount' task: %m");
1086 mount_set_reload_result(m, MOUNT_FAILURE_RESOURCES);
1087 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1088 }
1089
1090 static void mount_cycle_clear(Mount *m) {
1091 assert(m);
1092
1093 /* Clear all state we shall forget for this new cycle */
1094
1095 m->result = MOUNT_SUCCESS;
1096 m->reload_result = MOUNT_SUCCESS;
1097 exec_command_reset_status_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
1098 UNIT(m)->reset_accounting = true;
1099 }
1100
1101 static int mount_start(Unit *u) {
1102 Mount *m = MOUNT(u);
1103 int r;
1104
1105 assert(m);
1106
1107 /* We cannot fulfill this request right now, try again later
1108 * please! */
1109 if (IN_SET(m->state,
1110 MOUNT_UNMOUNTING,
1111 MOUNT_UNMOUNTING_SIGTERM,
1112 MOUNT_UNMOUNTING_SIGKILL))
1113 return -EAGAIN;
1114
1115 /* Already on it! */
1116 if (m->state == MOUNT_MOUNTING)
1117 return 0;
1118
1119 assert(IN_SET(m->state, MOUNT_DEAD, MOUNT_FAILED));
1120
1121 r = unit_start_limit_test(u);
1122 if (r < 0) {
1123 mount_enter_dead(m, MOUNT_FAILURE_START_LIMIT_HIT);
1124 return r;
1125 }
1126
1127 r = unit_acquire_invocation_id(u);
1128 if (r < 0)
1129 return r;
1130
1131 mount_cycle_clear(m);
1132 mount_enter_mounting(m);
1133
1134 return 1;
1135 }
1136
1137 static int mount_stop(Unit *u) {
1138 Mount *m = MOUNT(u);
1139
1140 assert(m);
1141
1142 switch (m->state) {
1143
1144 case MOUNT_UNMOUNTING:
1145 case MOUNT_UNMOUNTING_SIGKILL:
1146 case MOUNT_UNMOUNTING_SIGTERM:
1147 /* Already on it */
1148 return 0;
1149
1150 case MOUNT_MOUNTING:
1151 case MOUNT_MOUNTING_DONE:
1152 case MOUNT_REMOUNTING:
1153 /* If we are still waiting for /bin/mount, we go directly into kill mode. */
1154 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_SUCCESS);
1155 return 0;
1156
1157 case MOUNT_REMOUNTING_SIGTERM:
1158 /* If we are already waiting for a hung remount, convert this to the matching unmounting state */
1159 mount_set_state(m, MOUNT_UNMOUNTING_SIGTERM);
1160 return 0;
1161
1162 case MOUNT_REMOUNTING_SIGKILL:
1163 /* as above */
1164 mount_set_state(m, MOUNT_UNMOUNTING_SIGKILL);
1165 return 0;
1166
1167 case MOUNT_MOUNTED:
1168 mount_enter_unmounting(m);
1169 return 1;
1170
1171 default:
1172 assert_not_reached("Unexpected state.");
1173 }
1174 }
1175
1176 static int mount_reload(Unit *u) {
1177 Mount *m = MOUNT(u);
1178
1179 assert(m);
1180 assert(m->state == MOUNT_MOUNTED);
1181
1182 mount_enter_remounting(m);
1183
1184 return 1;
1185 }
1186
1187 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
1188 Mount *m = MOUNT(u);
1189
1190 assert(m);
1191 assert(f);
1192 assert(fds);
1193
1194 (void) serialize_item(f, "state", mount_state_to_string(m->state));
1195 (void) serialize_item(f, "result", mount_result_to_string(m->result));
1196 (void) serialize_item(f, "reload-result", mount_result_to_string(m->reload_result));
1197 (void) serialize_item_format(f, "n-retry-umount", "%u", m->n_retry_umount);
1198
1199 if (m->control_pid > 0)
1200 (void) serialize_item_format(f, "control-pid", PID_FMT, m->control_pid);
1201
1202 if (m->control_command_id >= 0)
1203 (void) serialize_item(f, "control-command", mount_exec_command_to_string(m->control_command_id));
1204
1205 return 0;
1206 }
1207
1208 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1209 Mount *m = MOUNT(u);
1210 int r;
1211
1212 assert(u);
1213 assert(key);
1214 assert(value);
1215 assert(fds);
1216
1217 if (streq(key, "state")) {
1218 MountState state;
1219
1220 if ((state = mount_state_from_string(value)) < 0)
1221 log_unit_debug(u, "Failed to parse state value: %s", value);
1222 else
1223 m->deserialized_state = state;
1224
1225 } else if (streq(key, "result")) {
1226 MountResult f;
1227
1228 f = mount_result_from_string(value);
1229 if (f < 0)
1230 log_unit_debug(u, "Failed to parse result value: %s", value);
1231 else if (f != MOUNT_SUCCESS)
1232 m->result = f;
1233
1234 } else if (streq(key, "reload-result")) {
1235 MountResult f;
1236
1237 f = mount_result_from_string(value);
1238 if (f < 0)
1239 log_unit_debug(u, "Failed to parse reload result value: %s", value);
1240 else if (f != MOUNT_SUCCESS)
1241 m->reload_result = f;
1242
1243 } else if (streq(key, "n-retry-umount")) {
1244
1245 r = safe_atou(value, &m->n_retry_umount);
1246 if (r < 0)
1247 log_unit_debug(u, "Failed to parse n-retry-umount value: %s", value);
1248
1249 } else if (streq(key, "control-pid")) {
1250
1251 if (parse_pid(value, &m->control_pid) < 0)
1252 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
1253
1254 } else if (streq(key, "control-command")) {
1255 MountExecCommand id;
1256
1257 id = mount_exec_command_from_string(value);
1258 if (id < 0)
1259 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
1260 else {
1261 m->control_command_id = id;
1262 m->control_command = m->exec_command + id;
1263 }
1264 } else
1265 log_unit_debug(u, "Unknown serialization key: %s", key);
1266
1267 return 0;
1268 }
1269
1270 _pure_ static UnitActiveState mount_active_state(Unit *u) {
1271 assert(u);
1272
1273 return state_translation_table[MOUNT(u)->state];
1274 }
1275
1276 _pure_ static const char *mount_sub_state_to_string(Unit *u) {
1277 assert(u);
1278
1279 return mount_state_to_string(MOUNT(u)->state);
1280 }
1281
1282 _pure_ static bool mount_may_gc(Unit *u) {
1283 Mount *m = MOUNT(u);
1284
1285 assert(m);
1286
1287 if (m->from_proc_self_mountinfo)
1288 return false;
1289
1290 return true;
1291 }
1292
1293 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1294 Mount *m = MOUNT(u);
1295 MountResult f;
1296
1297 assert(m);
1298 assert(pid >= 0);
1299
1300 if (pid != m->control_pid)
1301 return;
1302
1303 m->control_pid = 0;
1304
1305 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
1306 f = MOUNT_SUCCESS;
1307 else if (code == CLD_EXITED)
1308 f = MOUNT_FAILURE_EXIT_CODE;
1309 else if (code == CLD_KILLED)
1310 f = MOUNT_FAILURE_SIGNAL;
1311 else if (code == CLD_DUMPED)
1312 f = MOUNT_FAILURE_CORE_DUMP;
1313 else
1314 assert_not_reached("Unknown code");
1315
1316 if (IN_SET(m->state, MOUNT_REMOUNTING, MOUNT_REMOUNTING_SIGKILL, MOUNT_REMOUNTING_SIGTERM))
1317 mount_set_reload_result(m, f);
1318 else if (m->result == MOUNT_SUCCESS)
1319 m->result = f;
1320
1321 if (m->control_command) {
1322 exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status);
1323
1324 m->control_command = NULL;
1325 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1326 }
1327
1328 unit_log_process_exit(
1329 u, f == MOUNT_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
1330 "Mount process",
1331 mount_exec_command_to_string(m->control_command_id),
1332 code, status);
1333
1334 /* Note that due to the io event priority logic, we can be sure the new mountinfo is loaded
1335 * before we process the SIGCHLD for the mount command. */
1336
1337 switch (m->state) {
1338
1339 case MOUNT_MOUNTING:
1340 /* Our mount point has not appeared in mountinfo. Something went wrong. */
1341
1342 if (f == MOUNT_SUCCESS) {
1343 /* Either /bin/mount has an unexpected definition of success,
1344 * or someone raced us and we lost. */
1345 log_unit_warning(UNIT(m), "Mount process finished, but there is no mount.");
1346 f = MOUNT_FAILURE_PROTOCOL;
1347 }
1348 mount_enter_dead(m, f);
1349 break;
1350
1351 case MOUNT_MOUNTING_DONE:
1352 mount_enter_mounted(m, f);
1353 break;
1354
1355 case MOUNT_REMOUNTING:
1356 case MOUNT_REMOUNTING_SIGTERM:
1357 case MOUNT_REMOUNTING_SIGKILL:
1358 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1359 break;
1360
1361 case MOUNT_UNMOUNTING:
1362
1363 if (f == MOUNT_SUCCESS && m->from_proc_self_mountinfo) {
1364
1365 /* Still a mount point? If so, let's try again. Most likely there were multiple mount points
1366 * stacked on top of each other. We might exceed the timeout specified by the user overall,
1367 * but we will stop as soon as any one umount times out. */
1368
1369 if (m->n_retry_umount < RETRY_UMOUNT_MAX) {
1370 log_unit_debug(u, "Mount still present, trying again.");
1371 m->n_retry_umount++;
1372 mount_enter_unmounting(m);
1373 } else {
1374 log_unit_warning(u, "Mount still present after %u attempts to unmount, giving up.", m->n_retry_umount);
1375 mount_enter_mounted(m, f);
1376 }
1377 } else
1378 mount_enter_dead_or_mounted(m, f);
1379
1380 break;
1381
1382 case MOUNT_UNMOUNTING_SIGKILL:
1383 case MOUNT_UNMOUNTING_SIGTERM:
1384 mount_enter_dead_or_mounted(m, f);
1385 break;
1386
1387 default:
1388 assert_not_reached("Uh, control process died at wrong time.");
1389 }
1390
1391 /* Notify clients about changed exit status */
1392 unit_add_to_dbus_queue(u);
1393 }
1394
1395 static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
1396 Mount *m = MOUNT(userdata);
1397
1398 assert(m);
1399 assert(m->timer_event_source == source);
1400
1401 switch (m->state) {
1402
1403 case MOUNT_MOUNTING:
1404 case MOUNT_MOUNTING_DONE:
1405 log_unit_warning(UNIT(m), "Mounting timed out. Terminating.");
1406 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1407 break;
1408
1409 case MOUNT_REMOUNTING:
1410 log_unit_warning(UNIT(m), "Remounting timed out. Terminating remount process.");
1411 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1412 mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, MOUNT_SUCCESS);
1413 break;
1414
1415 case MOUNT_REMOUNTING_SIGTERM:
1416 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1417
1418 if (m->kill_context.send_sigkill) {
1419 log_unit_warning(UNIT(m), "Remounting timed out. Killing.");
1420 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
1421 } else {
1422 log_unit_warning(UNIT(m), "Remounting timed out. Skipping SIGKILL. Ignoring.");
1423 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1424 }
1425 break;
1426
1427 case MOUNT_REMOUNTING_SIGKILL:
1428 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1429
1430 log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
1431 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1432 break;
1433
1434 case MOUNT_UNMOUNTING:
1435 log_unit_warning(UNIT(m), "Unmounting timed out. Terminating.");
1436 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1437 break;
1438
1439 case MOUNT_UNMOUNTING_SIGTERM:
1440 if (m->kill_context.send_sigkill) {
1441 log_unit_warning(UNIT(m), "Mount process timed out. Killing.");
1442 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
1443 } else {
1444 log_unit_warning(UNIT(m), "Mount process timed out. Skipping SIGKILL. Ignoring.");
1445 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
1446 }
1447 break;
1448
1449 case MOUNT_UNMOUNTING_SIGKILL:
1450 log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
1451 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
1452 break;
1453
1454 default:
1455 assert_not_reached("Timeout at wrong time.");
1456 }
1457
1458 return 0;
1459 }
1460
1461 static int mount_setup_new_unit(
1462 Manager *m,
1463 const char *name,
1464 const char *what,
1465 const char *where,
1466 const char *options,
1467 const char *fstype,
1468 MountProcFlags *ret_flags,
1469 Unit **ret) {
1470
1471 _cleanup_(unit_freep) Unit *u = NULL;
1472 int r;
1473
1474 assert(m);
1475 assert(name);
1476 assert(ret_flags);
1477 assert(ret);
1478
1479 r = unit_new_for_name(m, sizeof(Mount), name, &u);
1480 if (r < 0)
1481 return r;
1482
1483 r = free_and_strdup(&u->source_path, "/proc/self/mountinfo");
1484 if (r < 0)
1485 return r;
1486
1487 r = free_and_strdup(&MOUNT(u)->where, where);
1488 if (r < 0)
1489 return r;
1490
1491 r = update_parameters_proc_self_mount_info(MOUNT(u), what, options, fstype);
1492 if (r < 0)
1493 return r;
1494
1495 /* This unit was generated because /proc/self/mountinfo reported it. Remember this, so that by the time we load
1496 * the unit file for it (and thus add in extra deps right after) we know what source to attributes the deps
1497 * to.*/
1498 MOUNT(u)->from_proc_self_mountinfo = true;
1499
1500 /* We have only allocated the stub now, let's enqueue this unit for loading now, so that everything else is
1501 * loaded in now. */
1502 unit_add_to_load_queue(u);
1503
1504 *ret_flags = MOUNT_PROC_IS_MOUNTED | MOUNT_PROC_JUST_MOUNTED | MOUNT_PROC_JUST_CHANGED;
1505 *ret = TAKE_PTR(u);
1506 return 0;
1507 }
1508
1509 static int mount_setup_existing_unit(
1510 Unit *u,
1511 const char *what,
1512 const char *where,
1513 const char *options,
1514 const char *fstype,
1515 MountProcFlags *ret_flags) {
1516
1517 MountProcFlags flags = MOUNT_PROC_IS_MOUNTED;
1518 int r;
1519
1520 assert(u);
1521 assert(flags);
1522
1523 if (!MOUNT(u)->where) {
1524 MOUNT(u)->where = strdup(where);
1525 if (!MOUNT(u)->where)
1526 return -ENOMEM;
1527 }
1528
1529 r = update_parameters_proc_self_mount_info(MOUNT(u), what, options, fstype);
1530 if (r < 0)
1531 return r;
1532 if (r > 0)
1533 flags |= MOUNT_PROC_JUST_CHANGED;
1534
1535 if (!MOUNT(u)->from_proc_self_mountinfo || FLAGS_SET(MOUNT(u)->proc_flags, MOUNT_PROC_JUST_MOUNTED))
1536 flags |= MOUNT_PROC_JUST_MOUNTED;
1537
1538 MOUNT(u)->from_proc_self_mountinfo = true;
1539
1540 if (IN_SET(u->load_state, UNIT_NOT_FOUND, UNIT_BAD_SETTING, UNIT_ERROR)) {
1541 /* The unit was previously not found or otherwise not loaded. Now that the unit shows up in
1542 * /proc/self/mountinfo we should reconsider it this, hence set it to UNIT_LOADED. */
1543 u->load_state = UNIT_LOADED;
1544 u->load_error = 0;
1545
1546 flags |= MOUNT_PROC_JUST_CHANGED;
1547 }
1548
1549 if (FLAGS_SET(flags, MOUNT_PROC_JUST_CHANGED)) {
1550 /* If things changed, then make sure that all deps are regenerated. Let's
1551 * first remove all automatic deps, and then add in the new ones. */
1552
1553 unit_remove_dependencies(u, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
1554
1555 r = mount_add_extras(MOUNT(u));
1556 if (r < 0)
1557 return r;
1558 }
1559
1560 *ret_flags = flags;
1561 return 0;
1562 }
1563
1564 static int mount_setup_unit(
1565 Manager *m,
1566 const char *what,
1567 const char *where,
1568 const char *options,
1569 const char *fstype,
1570 bool set_flags) {
1571
1572 _cleanup_free_ char *e = NULL;
1573 MountProcFlags flags;
1574 Unit *u;
1575 int r;
1576
1577 assert(m);
1578 assert(what);
1579 assert(where);
1580 assert(options);
1581 assert(fstype);
1582
1583 /* Ignore API mount points. They should never be referenced in
1584 * dependencies ever. */
1585 if (mount_point_is_api(where) || mount_point_ignore(where))
1586 return 0;
1587
1588 if (streq(fstype, "autofs"))
1589 return 0;
1590
1591 /* probably some kind of swap, ignore */
1592 if (!is_path(where))
1593 return 0;
1594
1595 r = unit_name_from_path(where, ".mount", &e);
1596 if (r < 0)
1597 return log_error_errno(r, "Failed to generate unit name from path '%s': %m", where);
1598
1599 u = manager_get_unit(m, e);
1600 if (u)
1601 r = mount_setup_existing_unit(u, what, where, options, fstype, &flags);
1602 else
1603 /* First time we see this mount point meaning that it's not been initiated by a mount unit but rather
1604 * by the sysadmin having called mount(8) directly. */
1605 r = mount_setup_new_unit(m, e, what, where, options, fstype, &flags, &u);
1606 if (r < 0)
1607 return log_warning_errno(r, "Failed to set up mount unit: %m");
1608
1609 /* If the mount changed properties or state, let's notify our clients */
1610 if (flags & (MOUNT_PROC_JUST_CHANGED|MOUNT_PROC_JUST_MOUNTED))
1611 unit_add_to_dbus_queue(u);
1612
1613 if (set_flags)
1614 MOUNT(u)->proc_flags = flags;
1615
1616 return 0;
1617 }
1618
1619 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1620 _cleanup_(mnt_free_tablep) struct libmnt_table *t = NULL;
1621 _cleanup_(mnt_free_iterp) struct libmnt_iter *i = NULL;
1622 int r;
1623
1624 assert(m);
1625
1626 t = mnt_new_table();
1627 i = mnt_new_iter(MNT_ITER_FORWARD);
1628 if (!t || !i)
1629 return log_oom();
1630
1631 r = mnt_table_parse_mtab(t, NULL);
1632 if (r < 0)
1633 return log_error_errno(r, "Failed to parse /proc/self/mountinfo: %m");
1634
1635 for (;;) {
1636 struct libmnt_fs *fs;
1637 const char *device, *path, *options, *fstype;
1638 _cleanup_free_ char *d = NULL, *p = NULL;
1639 int k;
1640
1641 k = mnt_table_next_fs(t, i, &fs);
1642 if (k == 1)
1643 break;
1644 if (k < 0)
1645 return log_error_errno(k, "Failed to get next entry from /proc/self/mountinfo: %m");
1646
1647 device = mnt_fs_get_source(fs);
1648 path = mnt_fs_get_target(fs);
1649 options = mnt_fs_get_options(fs);
1650 fstype = mnt_fs_get_fstype(fs);
1651
1652 if (!device || !path)
1653 continue;
1654
1655 if (cunescape(device, UNESCAPE_RELAX, &d) < 0)
1656 return log_oom();
1657
1658 if (cunescape(path, UNESCAPE_RELAX, &p) < 0)
1659 return log_oom();
1660
1661 device_found_node(m, d, DEVICE_FOUND_MOUNT, DEVICE_FOUND_MOUNT);
1662
1663 (void) mount_setup_unit(m, d, p, options, fstype, set_flags);
1664 }
1665
1666 return 0;
1667 }
1668
1669 static void mount_shutdown(Manager *m) {
1670 assert(m);
1671
1672 m->mount_event_source = sd_event_source_unref(m->mount_event_source);
1673
1674 mnt_unref_monitor(m->mount_monitor);
1675 m->mount_monitor = NULL;
1676 }
1677
1678 static int mount_get_timeout(Unit *u, usec_t *timeout) {
1679 Mount *m = MOUNT(u);
1680 usec_t t;
1681 int r;
1682
1683 if (!m->timer_event_source)
1684 return 0;
1685
1686 r = sd_event_source_get_time(m->timer_event_source, &t);
1687 if (r < 0)
1688 return r;
1689 if (t == USEC_INFINITY)
1690 return 0;
1691
1692 *timeout = t;
1693 return 1;
1694 }
1695
1696 static void mount_enumerate_perpetual(Manager *m) {
1697 Unit *u;
1698 int r;
1699
1700 assert(m);
1701
1702 /* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's
1703 * unconditionally synthesize it here and mark it as perpetual. */
1704
1705 u = manager_get_unit(m, SPECIAL_ROOT_MOUNT);
1706 if (!u) {
1707 r = unit_new_for_name(m, sizeof(Mount), SPECIAL_ROOT_MOUNT, &u);
1708 if (r < 0) {
1709 log_error_errno(r, "Failed to allocate the special " SPECIAL_ROOT_MOUNT " unit: %m");
1710 return;
1711 }
1712 }
1713
1714 u->perpetual = true;
1715 MOUNT(u)->deserialized_state = MOUNT_MOUNTED;
1716
1717 unit_add_to_load_queue(u);
1718 unit_add_to_dbus_queue(u);
1719 }
1720
1721 static bool mount_is_mounted(Mount *m) {
1722 assert(m);
1723
1724 return UNIT(m)->perpetual || FLAGS_SET(m->proc_flags, MOUNT_PROC_IS_MOUNTED);
1725 }
1726
1727 static void mount_enumerate(Manager *m) {
1728 int r;
1729
1730 assert(m);
1731
1732 mnt_init_debug(0);
1733
1734 if (!m->mount_monitor) {
1735 int fd;
1736
1737 m->mount_monitor = mnt_new_monitor();
1738 if (!m->mount_monitor) {
1739 log_oom();
1740 goto fail;
1741 }
1742
1743 r = mnt_monitor_enable_kernel(m->mount_monitor, 1);
1744 if (r < 0) {
1745 log_error_errno(r, "Failed to enable watching of kernel mount events: %m");
1746 goto fail;
1747 }
1748
1749 r = mnt_monitor_enable_userspace(m->mount_monitor, 1, NULL);
1750 if (r < 0) {
1751 log_error_errno(r, "Failed to enable watching of userspace mount events: %m");
1752 goto fail;
1753 }
1754
1755 /* mnt_unref_monitor() will close the fd */
1756 fd = r = mnt_monitor_get_fd(m->mount_monitor);
1757 if (r < 0) {
1758 log_error_errno(r, "Failed to acquire watch file descriptor: %m");
1759 goto fail;
1760 }
1761
1762 r = sd_event_add_io(m->event, &m->mount_event_source, fd, EPOLLIN, mount_dispatch_io, m);
1763 if (r < 0) {
1764 log_error_errno(r, "Failed to watch mount file descriptor: %m");
1765 goto fail;
1766 }
1767
1768 r = sd_event_source_set_priority(m->mount_event_source, SD_EVENT_PRIORITY_NORMAL-10);
1769 if (r < 0) {
1770 log_error_errno(r, "Failed to adjust mount watch priority: %m");
1771 goto fail;
1772 }
1773
1774 (void) sd_event_source_set_description(m->mount_event_source, "mount-monitor-dispatch");
1775 }
1776
1777 r = mount_load_proc_self_mountinfo(m, false);
1778 if (r < 0)
1779 goto fail;
1780
1781 return;
1782
1783 fail:
1784 mount_shutdown(m);
1785 }
1786
1787 static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
1788 _cleanup_set_free_free_ Set *around = NULL, *gone = NULL;
1789 Manager *m = userdata;
1790 const char *what;
1791 Iterator i;
1792 Unit *u;
1793 int r;
1794
1795 assert(m);
1796 assert(revents & EPOLLIN);
1797
1798 if (fd == mnt_monitor_get_fd(m->mount_monitor)) {
1799 bool rescan = false;
1800
1801 /* Drain all events and verify that the event is valid.
1802 *
1803 * Note that libmount also monitors /run/mount mkdir if the
1804 * directory does not exist yet. The mkdir may generate event
1805 * which is irrelevant for us.
1806 *
1807 * error: r < 0; valid: r == 0, false positive: rc == 1 */
1808 do {
1809 r = mnt_monitor_next_change(m->mount_monitor, NULL, NULL);
1810 if (r == 0)
1811 rescan = true;
1812 else if (r < 0)
1813 return log_error_errno(r, "Failed to drain libmount events: %m");
1814 } while (r == 0);
1815
1816 log_debug("libmount event [rescan: %s]", yes_no(rescan));
1817 if (!rescan)
1818 return 0;
1819 }
1820
1821 r = mount_load_proc_self_mountinfo(m, true);
1822 if (r < 0) {
1823 /* Reset flags, just in case, for later calls */
1824 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT])
1825 MOUNT(u)->proc_flags = 0;
1826
1827 return 0;
1828 }
1829
1830 manager_dispatch_load_queue(m);
1831
1832 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1833 Mount *mount = MOUNT(u);
1834
1835 if (!mount_is_mounted(mount)) {
1836
1837 /* A mount point is not around right now. It
1838 * might be gone, or might never have
1839 * existed. */
1840
1841 if (mount->from_proc_self_mountinfo &&
1842 mount->parameters_proc_self_mountinfo.what) {
1843
1844 /* Remember that this device might just have disappeared */
1845 if (set_ensure_allocated(&gone, &path_hash_ops) < 0 ||
1846 set_put_strdup(gone, mount->parameters_proc_self_mountinfo.what) < 0)
1847 log_oom(); /* we don't care too much about OOM here... */
1848 }
1849
1850 mount->from_proc_self_mountinfo = false;
1851 assert_se(update_parameters_proc_self_mount_info(mount, NULL, NULL, NULL) >= 0);
1852
1853 switch (mount->state) {
1854
1855 case MOUNT_MOUNTED:
1856 /* This has just been unmounted by somebody else, follow the state change. */
1857 mount_enter_dead(mount, MOUNT_SUCCESS);
1858 break;
1859
1860 default:
1861 break;
1862 }
1863
1864 } else if (mount->proc_flags & (MOUNT_PROC_JUST_MOUNTED|MOUNT_PROC_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(u);
1876 mount_cycle_clear(mount);
1877 mount_enter_mounted(mount, MOUNT_SUCCESS);
1878 break;
1879
1880 case MOUNT_MOUNTING:
1881 mount_set_state(mount, MOUNT_MOUNTING_DONE);
1882 break;
1883
1884 default:
1885 /* Nothing really changed, but let's
1886 * issue an notification call
1887 * nonetheless, in case somebody is
1888 * waiting for this. (e.g. file system
1889 * ro/rw remounts.) */
1890 mount_set_state(mount, mount->state);
1891 break;
1892 }
1893 }
1894
1895 if (mount_is_mounted(mount) &&
1896 mount->from_proc_self_mountinfo &&
1897 mount->parameters_proc_self_mountinfo.what) {
1898 /* Track devices currently used */
1899
1900 if (set_ensure_allocated(&around, &path_hash_ops) < 0 ||
1901 set_put_strdup(around, mount->parameters_proc_self_mountinfo.what) < 0)
1902 log_oom();
1903 }
1904
1905 /* Reset the flags for later calls */
1906 mount->proc_flags = 0;
1907 }
1908
1909 SET_FOREACH(what, gone, i) {
1910 if (set_contains(around, what))
1911 continue;
1912
1913 /* Let the device units know that the device is no longer mounted */
1914 device_found_node(m, what, 0, DEVICE_FOUND_MOUNT);
1915 }
1916
1917 return 0;
1918 }
1919
1920 static void mount_reset_failed(Unit *u) {
1921 Mount *m = MOUNT(u);
1922
1923 assert(m);
1924
1925 if (m->state == MOUNT_FAILED)
1926 mount_set_state(m, MOUNT_DEAD);
1927
1928 m->result = MOUNT_SUCCESS;
1929 m->reload_result = MOUNT_SUCCESS;
1930 }
1931
1932 static int mount_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
1933 Mount *m = MOUNT(u);
1934
1935 assert(m);
1936
1937 return unit_kill_common(u, who, signo, -1, MOUNT(u)->control_pid, error);
1938 }
1939
1940 static int mount_control_pid(Unit *u) {
1941 Mount *m = MOUNT(u);
1942
1943 assert(m);
1944
1945 return m->control_pid;
1946 }
1947
1948 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1949 [MOUNT_EXEC_MOUNT] = "ExecMount",
1950 [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1951 [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1952 };
1953
1954 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1955
1956 static const char* const mount_result_table[_MOUNT_RESULT_MAX] = {
1957 [MOUNT_SUCCESS] = "success",
1958 [MOUNT_FAILURE_RESOURCES] = "resources",
1959 [MOUNT_FAILURE_TIMEOUT] = "timeout",
1960 [MOUNT_FAILURE_EXIT_CODE] = "exit-code",
1961 [MOUNT_FAILURE_SIGNAL] = "signal",
1962 [MOUNT_FAILURE_CORE_DUMP] = "core-dump",
1963 [MOUNT_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
1964 [MOUNT_FAILURE_PROTOCOL] = "protocol",
1965 };
1966
1967 DEFINE_STRING_TABLE_LOOKUP(mount_result, MountResult);
1968
1969 const UnitVTable mount_vtable = {
1970 .object_size = sizeof(Mount),
1971 .exec_context_offset = offsetof(Mount, exec_context),
1972 .cgroup_context_offset = offsetof(Mount, cgroup_context),
1973 .kill_context_offset = offsetof(Mount, kill_context),
1974 .exec_runtime_offset = offsetof(Mount, exec_runtime),
1975 .dynamic_creds_offset = offsetof(Mount, dynamic_creds),
1976
1977 .sections =
1978 "Unit\0"
1979 "Mount\0"
1980 "Install\0",
1981 .private_section = "Mount",
1982
1983 .init = mount_init,
1984 .load = mount_load,
1985 .done = mount_done,
1986
1987 .coldplug = mount_coldplug,
1988
1989 .dump = mount_dump,
1990
1991 .start = mount_start,
1992 .stop = mount_stop,
1993 .reload = mount_reload,
1994
1995 .kill = mount_kill,
1996
1997 .serialize = mount_serialize,
1998 .deserialize_item = mount_deserialize_item,
1999
2000 .active_state = mount_active_state,
2001 .sub_state_to_string = mount_sub_state_to_string,
2002
2003 .may_gc = mount_may_gc,
2004
2005 .sigchld_event = mount_sigchld_event,
2006
2007 .reset_failed = mount_reset_failed,
2008
2009 .control_pid = mount_control_pid,
2010
2011 .bus_vtable = bus_mount_vtable,
2012 .bus_set_property = bus_mount_set_property,
2013 .bus_commit_properties = bus_mount_commit_properties,
2014
2015 .get_timeout = mount_get_timeout,
2016
2017 .can_transient = true,
2018
2019 .enumerate_perpetual = mount_enumerate_perpetual,
2020 .enumerate = mount_enumerate,
2021 .shutdown = mount_shutdown,
2022
2023 .status_message_formats = {
2024 .starting_stopping = {
2025 [0] = "Mounting %s...",
2026 [1] = "Unmounting %s...",
2027 },
2028 .finished_start_job = {
2029 [JOB_DONE] = "Mounted %s.",
2030 [JOB_FAILED] = "Failed to mount %s.",
2031 [JOB_TIMEOUT] = "Timed out mounting %s.",
2032 },
2033 .finished_stop_job = {
2034 [JOB_DONE] = "Unmounted %s.",
2035 [JOB_FAILED] = "Failed unmounting %s.",
2036 [JOB_TIMEOUT] = "Timed out unmounting %s.",
2037 },
2038 },
2039 };
Unnamed repository; edit this file 'description' to name the repository.