]> 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
tree-wide: use ASSERT_PTR more
[thirdparty/systemd.git] / src / core / mount.c
1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3 #include <errno.h>
4 #include <signal.h>
5 #include <stdio.h>
6 #include <sys/epoll.h>
7
8 #include "sd-messages.h"
9
10 #include "alloc-util.h"
11 #include "dbus-mount.h"
12 #include "dbus-unit.h"
13 #include "device.h"
14 #include "exit-status.h"
15 #include "format-util.h"
16 #include "fstab-util.h"
17 #include "libmount-util.h"
18 #include "log.h"
19 #include "manager.h"
20 #include "mkdir-label.h"
21 #include "mount-setup.h"
22 #include "mount.h"
23 #include "mountpoint-util.h"
24 #include "parse-util.h"
25 #include "path-util.h"
26 #include "process-util.h"
27 #include "serialize.h"
28 #include "special.h"
29 #include "string-table.h"
30 #include "string-util.h"
31 #include "strv.h"
32 #include "unit-name.h"
33 #include "unit.h"
34
35 #define RETRY_UMOUNT_MAX 32
36
37 static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
38 [MOUNT_DEAD] = UNIT_INACTIVE,
39 [MOUNT_MOUNTING] = UNIT_ACTIVATING,
40 [MOUNT_MOUNTING_DONE] = UNIT_ACTIVATING,
41 [MOUNT_MOUNTED] = UNIT_ACTIVE,
42 [MOUNT_REMOUNTING] = UNIT_RELOADING,
43 [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
44 [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING,
45 [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING,
46 [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
47 [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
48 [MOUNT_FAILED] = UNIT_FAILED,
49 [MOUNT_CLEANING] = UNIT_MAINTENANCE,
50 };
51
52 static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
53 static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
54 static void mount_enter_dead(Mount *m, MountResult f);
55 static void mount_enter_mounted(Mount *m, MountResult f);
56 static void mount_cycle_clear(Mount *m);
57 static int mount_process_proc_self_mountinfo(Manager *m);
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 MOUNT_CLEANING);
70 }
71
72 static MountParameters* get_mount_parameters_fragment(Mount *m) {
73 assert(m);
74
75 if (m->from_fragment)
76 return &m->parameters_fragment;
77
78 return NULL;
79 }
80
81 static MountParameters* get_mount_parameters(Mount *m) {
82 assert(m);
83
84 if (m->from_proc_self_mountinfo)
85 return &m->parameters_proc_self_mountinfo;
86
87 return get_mount_parameters_fragment(m);
88 }
89
90 static bool mount_is_network(const MountParameters *p) {
91 assert(p);
92
93 if (fstab_test_option(p->options, "_netdev\0"))
94 return true;
95
96 if (p->fstype && fstype_is_network(p->fstype))
97 return true;
98
99 return false;
100 }
101
102 static bool mount_is_nofail(const Mount *m) {
103 assert(m);
104
105 if (!m->from_fragment)
106 return false;
107
108 return fstab_test_yes_no_option(m->parameters_fragment.options, "nofail\0" "fail\0");
109 }
110
111 static bool mount_is_loop(const MountParameters *p) {
112 assert(p);
113
114 if (fstab_test_option(p->options, "loop\0"))
115 return true;
116
117 return false;
118 }
119
120 static bool mount_is_bind(const MountParameters *p) {
121 assert(p);
122
123 if (fstab_test_option(p->options, "bind\0" "rbind\0"))
124 return true;
125
126 if (p->fstype && STR_IN_SET(p->fstype, "bind", "rbind"))
127 return true;
128
129 return false;
130 }
131
132 static bool mount_is_bound_to_device(Mount *m) {
133 const MountParameters *p;
134
135 assert(m);
136
137 /* Determines whether to place a Requires= or BindsTo= dependency on the backing device unit. We do
138 * this by checking for the x-systemd.device-bound mount option. Iff it is set we use BindsTo=,
139 * otherwise Requires=. But note that we might combine the latter with StopPropagatedFrom=, see
140 * below. */
141
142 p = get_mount_parameters(m);
143 if (!p)
144 return false;
145
146 return fstab_test_option(p->options, "x-systemd.device-bound\0");
147 }
148
149 static bool mount_propagate_stop(Mount *m) {
150 assert(m);
151
152 if (mount_is_bound_to_device(m)) /* If we are using BindsTo= the stop propagation is implicit, no need to bother */
153 return false;
154
155 return m->from_fragment; /* let's propagate stop whenever this is an explicitly configured unit,
156 * otherwise let's not bother. */
157 }
158
159 static bool mount_needs_quota(const MountParameters *p) {
160 assert(p);
161
162 /* Quotas are not enabled on network filesystems, but we want them, for example, on storage connected via
163 * iscsi. We hence don't use mount_is_network() here, as that would also return true for _netdev devices. */
164 if (p->fstype && fstype_is_network(p->fstype))
165 return false;
166
167 if (mount_is_bind(p))
168 return false;
169
170 return fstab_test_option(p->options,
171 "usrquota\0" "grpquota\0" "quota\0" "usrjquota\0" "grpjquota\0");
172 }
173
174 static void mount_init(Unit *u) {
175 Mount *m = MOUNT(u);
176
177 assert(m);
178 assert(u);
179 assert(u->load_state == UNIT_STUB);
180
181 m->timeout_usec = u->manager->default_timeout_start_usec;
182
183 m->exec_context.std_output = u->manager->default_std_output;
184 m->exec_context.std_error = u->manager->default_std_error;
185
186 m->directory_mode = 0755;
187
188 /* We need to make sure that /usr/bin/mount is always called
189 * in the same process group as us, so that the autofs kernel
190 * side doesn't send us another mount request while we are
191 * already trying to comply its last one. */
192 m->exec_context.same_pgrp = true;
193
194 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
195
196 u->ignore_on_isolate = true;
197 }
198
199 static int mount_arm_timer(Mount *m, usec_t usec) {
200 int r;
201
202 assert(m);
203
204 if (m->timer_event_source) {
205 r = sd_event_source_set_time(m->timer_event_source, usec);
206 if (r < 0)
207 return r;
208
209 return sd_event_source_set_enabled(m->timer_event_source, SD_EVENT_ONESHOT);
210 }
211
212 if (usec == USEC_INFINITY)
213 return 0;
214
215 r = sd_event_add_time(
216 UNIT(m)->manager->event,
217 &m->timer_event_source,
218 CLOCK_MONOTONIC,
219 usec, 0,
220 mount_dispatch_timer, m);
221 if (r < 0)
222 return r;
223
224 (void) sd_event_source_set_description(m->timer_event_source, "mount-timer");
225
226 return 0;
227 }
228
229 static void mount_unwatch_control_pid(Mount *m) {
230 assert(m);
231
232 if (m->control_pid <= 0)
233 return;
234
235 unit_unwatch_pid(UNIT(m), TAKE_PID(m->control_pid));
236 }
237
238 static void mount_parameters_done(MountParameters *p) {
239 assert(p);
240
241 p->what = mfree(p->what);
242 p->options = mfree(p->options);
243 p->fstype = mfree(p->fstype);
244 }
245
246 static void mount_done(Unit *u) {
247 Mount *m = MOUNT(u);
248
249 assert(m);
250
251 m->where = mfree(m->where);
252
253 mount_parameters_done(&m->parameters_proc_self_mountinfo);
254 mount_parameters_done(&m->parameters_fragment);
255
256 m->exec_runtime = exec_runtime_unref(m->exec_runtime, false);
257 exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
258 m->control_command = NULL;
259
260 dynamic_creds_unref(&m->dynamic_creds);
261
262 mount_unwatch_control_pid(m);
263
264 m->timer_event_source = sd_event_source_disable_unref(m->timer_event_source);
265 }
266
267 static int update_parameters_proc_self_mountinfo(
268 Mount *m,
269 const char *what,
270 const char *options,
271 const char *fstype) {
272
273 MountParameters *p;
274 int r, q, w;
275
276 p = &m->parameters_proc_self_mountinfo;
277
278 r = free_and_strdup(&p->what, what);
279 if (r < 0)
280 return r;
281
282 q = free_and_strdup(&p->options, options);
283 if (q < 0)
284 return q;
285
286 w = free_and_strdup(&p->fstype, fstype);
287 if (w < 0)
288 return w;
289
290 return r > 0 || q > 0 || w > 0;
291 }
292
293 static int mount_add_mount_dependencies(Mount *m) {
294 MountParameters *pm;
295 Unit *other;
296 Set *s;
297 int r;
298
299 assert(m);
300
301 if (!path_equal(m->where, "/")) {
302 _cleanup_free_ char *parent = NULL;
303
304 /* Adds in links to other mount points that might lie further up in the hierarchy */
305
306 r = path_extract_directory(m->where, &parent);
307 if (r < 0)
308 return r;
309
310 r = unit_require_mounts_for(UNIT(m), parent, UNIT_DEPENDENCY_IMPLICIT);
311 if (r < 0)
312 return r;
313 }
314
315 /* Adds in dependencies to other mount points that might be needed for the source path (if this is a bind mount
316 * or a loop mount) to be available. */
317 pm = get_mount_parameters_fragment(m);
318 if (pm && pm->what &&
319 path_is_absolute(pm->what) &&
320 (mount_is_bind(pm) || mount_is_loop(pm) || !mount_is_network(pm))) {
321
322 r = unit_require_mounts_for(UNIT(m), pm->what, UNIT_DEPENDENCY_FILE);
323 if (r < 0)
324 return r;
325 }
326
327 /* Adds in dependencies to other units that use this path or paths further down in the hierarchy */
328 s = manager_get_units_requiring_mounts_for(UNIT(m)->manager, m->where);
329 SET_FOREACH(other, s) {
330
331 if (other->load_state != UNIT_LOADED)
332 continue;
333
334 if (other == UNIT(m))
335 continue;
336
337 r = unit_add_dependency(other, UNIT_AFTER, UNIT(m), true, UNIT_DEPENDENCY_PATH);
338 if (r < 0)
339 return r;
340
341 if (UNIT(m)->fragment_path) {
342 /* If we have fragment configuration, then make this dependency required */
343 r = unit_add_dependency(other, UNIT_REQUIRES, UNIT(m), true, UNIT_DEPENDENCY_PATH);
344 if (r < 0)
345 return r;
346 }
347 }
348
349 return 0;
350 }
351
352 static int mount_add_device_dependencies(Mount *m) {
353 MountParameters *p;
354 UnitDependency dep;
355 int r;
356
357 assert(m);
358
359 log_unit_trace(UNIT(m), "Processing implicit device dependencies");
360
361 p = get_mount_parameters(m);
362 if (!p) {
363 log_unit_trace(UNIT(m), "Missing mount parameters, skipping implicit device dependencies");
364 return 0;
365 }
366
367 if (!p->what) {
368 log_unit_trace(UNIT(m), "Missing mount source, skipping implicit device dependencies");
369 return 0;
370 }
371
372 if (mount_is_bind(p)) {
373 log_unit_trace(UNIT(m), "Mount unit is a bind mount, skipping implicit device dependencies");
374 return 0;
375 }
376
377 if (!is_device_path(p->what)) {
378 log_unit_trace(UNIT(m), "Mount source is not a device path, skipping implicit device dependencies");
379 return 0;
380 }
381
382 /* /dev/root is a really weird thing, it's not a real device, but just a path the kernel exports for
383 * the root file system specified on the kernel command line. Ignore it here. */
384 if (PATH_IN_SET(p->what, "/dev/root", "/dev/nfs")) {
385 log_unit_trace(UNIT(m), "Mount source is in /dev/root or /dev/nfs, skipping implicit device dependencies");
386 return 0;
387 }
388
389 if (path_equal(m->where, "/")) {
390 log_unit_trace(UNIT(m), "Mount destination is '/', skipping implicit device dependencies");
391 return 0;
392 }
393
394 /* Mount units from /proc/self/mountinfo are not bound to devices by default since they're subject to
395 * races when mounts are established by other tools with different backing devices than what we
396 * maintain. The user can still force this to be a BindsTo= dependency with an appropriate option (or
397 * udev property) so the mount units are automatically stopped when the device disappears
398 * suddenly. */
399 dep = mount_is_bound_to_device(m) ? UNIT_BINDS_TO : UNIT_REQUIRES;
400
401 r = unit_add_node_dependency(UNIT(m), p->what, dep, UNIT_DEPENDENCY_MOUNTINFO_OR_FILE);
402 if (r < 0)
403 return r;
404 if (r > 0)
405 log_unit_trace(UNIT(m), "Added %s dependency on %s", unit_dependency_to_string(dep), p->what);
406
407 if (mount_propagate_stop(m)) {
408 r = unit_add_node_dependency(UNIT(m), p->what, UNIT_STOP_PROPAGATED_FROM, UNIT_DEPENDENCY_MOUNTINFO_OR_FILE);
409 if (r < 0)
410 return r;
411 if (r > 0)
412 log_unit_trace(UNIT(m), "Added %s dependency on %s",
413 unit_dependency_to_string(UNIT_STOP_PROPAGATED_FROM), p->what);
414 }
415
416 r = unit_add_blockdev_dependency(UNIT(m), p->what, UNIT_DEPENDENCY_MOUNTINFO_OR_FILE);
417 if (r > 0)
418 log_unit_trace(UNIT(m), "Added %s dependency on %s", unit_dependency_to_string(UNIT_AFTER), p->what);
419
420 return 0;
421 }
422
423 static int mount_add_quota_dependencies(Mount *m) {
424 UnitDependencyMask mask;
425 MountParameters *p;
426 int r;
427
428 assert(m);
429
430 if (!MANAGER_IS_SYSTEM(UNIT(m)->manager))
431 return 0;
432
433 p = get_mount_parameters_fragment(m);
434 if (!p)
435 return 0;
436
437 if (!mount_needs_quota(p))
438 return 0;
439
440 mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT;
441
442 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, true, mask);
443 if (r < 0)
444 return r;
445
446 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, true, mask);
447 if (r < 0)
448 return r;
449
450 return 0;
451 }
452
453 static bool mount_is_extrinsic(Unit *u) {
454 MountParameters *p;
455 Mount *m = MOUNT(u);
456 assert(m);
457
458 /* Returns true for all units that are "magic" and should be excluded from the usual
459 * start-up and shutdown dependencies. We call them "extrinsic" here, as they are generally
460 * mounted outside of the systemd dependency logic. We shouldn't attempt to manage them
461 * ourselves but it's fine if the user operates on them with us. */
462
463 /* We only automatically manage mounts if we are in system mode */
464 if (MANAGER_IS_USER(u->manager))
465 return true;
466
467 p = get_mount_parameters(m);
468 if (p && fstab_is_extrinsic(m->where, p->options))
469 return true;
470
471 return false;
472 }
473
474 static int mount_add_default_ordering_dependencies(
475 Mount *m,
476 MountParameters *p) {
477
478 const char *after, *before, *e;
479 int r;
480
481 assert(m);
482
483 e = path_startswith(m->where, "/sysroot");
484 if (e && in_initrd()) {
485 /* All mounts under /sysroot need to happen later, at initrd-fs.target time. IOW,
486 * it's not technically part of the basic initrd filesystem itself, and so
487 * shouldn't inherit the default Before=local-fs.target dependency. */
488
489 after = NULL;
490 before = isempty(e) ? SPECIAL_INITRD_ROOT_FS_TARGET : SPECIAL_INITRD_FS_TARGET;
491
492 } else if (mount_is_network(p)) {
493 after = SPECIAL_REMOTE_FS_PRE_TARGET;
494 before = SPECIAL_REMOTE_FS_TARGET;
495
496 } else {
497 after = SPECIAL_LOCAL_FS_PRE_TARGET;
498 before = SPECIAL_LOCAL_FS_TARGET;
499 }
500
501 if (!mount_is_nofail(m)) {
502 r = unit_add_dependency_by_name(UNIT(m), UNIT_BEFORE, before, true,
503 UNIT_DEPENDENCY_MOUNTINFO_OR_FILE);
504 if (r < 0)
505 return r;
506 }
507
508 if (after) {
509 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, true,
510 UNIT_DEPENDENCY_MOUNTINFO_OR_FILE);
511 if (r < 0)
512 return r;
513 }
514
515 return unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS,
516 SPECIAL_UMOUNT_TARGET, true,
517 UNIT_DEPENDENCY_MOUNTINFO_OR_FILE);
518 }
519
520 static int mount_add_default_dependencies(Mount *m) {
521 MountParameters *p;
522 int r;
523
524 assert(m);
525
526 if (!UNIT(m)->default_dependencies)
527 return 0;
528
529 /* We do not add any default dependencies to /, /usr or /run/initramfs/, since they are
530 * guaranteed to stay mounted the whole time, since our system is on it. Also, don't
531 * bother with anything mounted below virtual file systems, it's also going to be virtual,
532 * and hence not worth the effort. */
533 if (mount_is_extrinsic(UNIT(m)))
534 return 0;
535
536 p = get_mount_parameters(m);
537 if (!p)
538 return 0;
539
540 r = mount_add_default_ordering_dependencies(m, p);
541 if (r < 0)
542 return r;
543
544 if (mount_is_network(p)) {
545 /* We order ourselves after network.target. This is primarily useful at shutdown:
546 * services that take down the network should order themselves before
547 * network.target, so that they are shut down only after this mount unit is
548 * stopped. */
549
550 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_NETWORK_TARGET, true,
551 UNIT_DEPENDENCY_MOUNTINFO_OR_FILE);
552 if (r < 0)
553 return r;
554
555 /* We pull in network-online.target, and order ourselves after it. This is useful
556 * at start-up to actively pull in tools that want to be started before we start
557 * mounting network file systems, and whose purpose it is to delay this until the
558 * network is "up". */
559
560 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_WANTS, UNIT_AFTER,
561 SPECIAL_NETWORK_ONLINE_TARGET, true,
562 UNIT_DEPENDENCY_MOUNTINFO_OR_FILE);
563 if (r < 0)
564 return r;
565 }
566
567 /* If this is a tmpfs mount then we have to unmount it before we try to deactivate swaps */
568 if (streq_ptr(p->fstype, "tmpfs")) {
569 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_SWAP_TARGET, true,
570 UNIT_DEPENDENCY_MOUNTINFO_OR_FILE);
571 if (r < 0)
572 return r;
573 }
574
575 return 0;
576 }
577
578 static int mount_verify(Mount *m) {
579 _cleanup_free_ char *e = NULL;
580 MountParameters *p;
581 int r;
582
583 assert(m);
584 assert(UNIT(m)->load_state == UNIT_LOADED);
585
586 if (!m->from_fragment && !m->from_proc_self_mountinfo && !UNIT(m)->perpetual)
587 return -ENOENT;
588
589 r = unit_name_from_path(m->where, ".mount", &e);
590 if (r < 0)
591 return log_unit_error_errno(UNIT(m), r, "Failed to generate unit name from mount path: %m");
592
593 if (!unit_has_name(UNIT(m), e))
594 return log_unit_error_errno(UNIT(m), SYNTHETIC_ERRNO(ENOEXEC), "Where= setting doesn't match unit name. Refusing.");
595
596 if (mount_point_is_api(m->where) || mount_point_ignore(m->where))
597 return log_unit_error_errno(UNIT(m), SYNTHETIC_ERRNO(ENOEXEC), "Cannot create mount unit for API file system %s. Refusing.", m->where);
598
599 p = get_mount_parameters_fragment(m);
600 if (p && !p->what && !UNIT(m)->perpetual)
601 return log_unit_error_errno(UNIT(m), SYNTHETIC_ERRNO(ENOEXEC),
602 "What= setting is missing. Refusing.");
603
604 if (m->exec_context.pam_name && m->kill_context.kill_mode != KILL_CONTROL_GROUP)
605 return log_unit_error_errno(UNIT(m), SYNTHETIC_ERRNO(ENOEXEC), "Unit has PAM enabled. Kill mode must be set to control-group'. Refusing.");
606
607 return 0;
608 }
609
610 static int mount_add_non_exec_dependencies(Mount *m) {
611 int r;
612
613 assert(m);
614
615 /* Any dependencies based on /proc/self/mountinfo may be now stale. */
616 unit_remove_dependencies(UNIT(m),
617 UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT |
618 UNIT_DEPENDENCY_MOUNTINFO_DEFAULT |
619 UNIT_DEPENDENCY_MOUNTINFO_OR_FILE);
620
621 if (!m->where)
622 return 0;
623
624 /* Adds in all dependencies directly responsible for ordering the mount, as opposed to dependencies
625 * resulting from the ExecContext and such. */
626
627 r = mount_add_device_dependencies(m);
628 if (r < 0)
629 return r;
630
631 r = mount_add_mount_dependencies(m);
632 if (r < 0)
633 return r;
634
635 r = mount_add_quota_dependencies(m);
636 if (r < 0)
637 return r;
638
639 r = mount_add_default_dependencies(m);
640 if (r < 0)
641 return r;
642
643 return 0;
644 }
645
646 static int mount_add_extras(Mount *m) {
647 Unit *u = UNIT(m);
648 int r;
649
650 assert(m);
651
652 /* Note: this call might be called after we already have been loaded once (and even when it has already been
653 * activated), in case data from /proc/self/mountinfo has changed. This means all code here needs to be ready
654 * to run with an already set up unit. */
655
656 if (u->fragment_path)
657 m->from_fragment = true;
658
659 if (!m->where) {
660 r = unit_name_to_path(u->id, &m->where);
661 if (r == -ENAMETOOLONG)
662 log_unit_error_errno(u, r, "Failed to derive mount point path from unit name, because unit name is hashed. "
663 "Set \"Where=\" in the unit file explicitly.");
664 if (r < 0)
665 return r;
666 }
667
668 path_simplify(m->where);
669
670 if (!u->description) {
671 r = unit_set_description(u, m->where);
672 if (r < 0)
673 return r;
674 }
675
676 r = unit_patch_contexts(u);
677 if (r < 0)
678 return r;
679
680 r = unit_add_exec_dependencies(u, &m->exec_context);
681 if (r < 0)
682 return r;
683
684 r = unit_set_default_slice(u);
685 if (r < 0)
686 return r;
687
688 r = mount_add_non_exec_dependencies(m);
689 if (r < 0)
690 return r;
691
692 return 0;
693 }
694
695 static void mount_load_root_mount(Unit *u) {
696 assert(u);
697
698 if (!unit_has_name(u, SPECIAL_ROOT_MOUNT))
699 return;
700
701 u->perpetual = true;
702 u->default_dependencies = false;
703
704 /* The stdio/kmsg bridge socket is on /, in order to avoid a dep loop, don't use kmsg logging for -.mount */
705 MOUNT(u)->exec_context.std_output = EXEC_OUTPUT_NULL;
706 MOUNT(u)->exec_context.std_input = EXEC_INPUT_NULL;
707
708 if (!u->description)
709 u->description = strdup("Root Mount");
710 }
711
712 static int mount_load(Unit *u) {
713 Mount *m = MOUNT(u);
714 int r, q = 0;
715
716 assert(m);
717 assert(u);
718 assert(u->load_state == UNIT_STUB);
719
720 mount_load_root_mount(u);
721
722 bool fragment_optional = m->from_proc_self_mountinfo || u->perpetual;
723 r = unit_load_fragment_and_dropin(u, !fragment_optional);
724
725 /* Add in some extras. Note we do this in all cases (even if we failed to load the unit) when announced by the
726 * kernel, because we need some things to be set up no matter what when the kernel establishes a mount and thus
727 * we need to update the state in our unit to track it. After all, consider that we don't allow changing the
728 * 'slice' field for a unit once it is active. */
729 if (u->load_state == UNIT_LOADED || m->from_proc_self_mountinfo || u->perpetual)
730 q = mount_add_extras(m);
731
732 if (r < 0)
733 return r;
734 if (q < 0)
735 return q;
736 if (u->load_state != UNIT_LOADED)
737 return 0;
738
739 return mount_verify(m);
740 }
741
742 static void mount_set_state(Mount *m, MountState state) {
743 MountState old_state;
744 assert(m);
745
746 if (m->state != state)
747 bus_unit_send_pending_change_signal(UNIT(m), false);
748
749 old_state = m->state;
750 m->state = state;
751
752 if (!MOUNT_STATE_WITH_PROCESS(state)) {
753 m->timer_event_source = sd_event_source_disable_unref(m->timer_event_source);
754 mount_unwatch_control_pid(m);
755 m->control_command = NULL;
756 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
757 }
758
759 if (state != old_state)
760 log_unit_debug(UNIT(m), "Changed %s -> %s", mount_state_to_string(old_state), mount_state_to_string(state));
761
762 unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state],
763 m->reload_result == MOUNT_SUCCESS ? 0 : UNIT_NOTIFY_RELOAD_FAILURE);
764 }
765
766 static int mount_coldplug(Unit *u) {
767 Mount *m = MOUNT(u);
768 int r;
769
770 assert(m);
771 assert(m->state == MOUNT_DEAD);
772
773 if (m->deserialized_state == m->state)
774 return 0;
775
776 if (m->control_pid > 0 &&
777 pid_is_unwaited(m->control_pid) &&
778 MOUNT_STATE_WITH_PROCESS(m->deserialized_state)) {
779
780 r = unit_watch_pid(UNIT(m), m->control_pid, false);
781 if (r < 0)
782 return r;
783
784 r = mount_arm_timer(m, usec_add(u->state_change_timestamp.monotonic, m->timeout_usec));
785 if (r < 0)
786 return r;
787 }
788
789 if (!IN_SET(m->deserialized_state, MOUNT_DEAD, MOUNT_FAILED)) {
790 (void) unit_setup_dynamic_creds(u);
791 (void) unit_setup_exec_runtime(u);
792 }
793
794 mount_set_state(m, m->deserialized_state);
795 return 0;
796 }
797
798 static void mount_catchup(Unit *u) {
799 Mount *m = MOUNT(ASSERT_PTR(u));
800
801 assert(m);
802
803 /* Adjust the deserialized state. See comments in mount_process_proc_self_mountinfo(). */
804 if (m->from_proc_self_mountinfo)
805 switch (m->state) {
806 case MOUNT_DEAD:
807 case MOUNT_FAILED:
808 assert(m->control_pid == 0);
809 (void) unit_acquire_invocation_id(u);
810 mount_cycle_clear(m);
811 mount_enter_mounted(m, MOUNT_SUCCESS);
812 break;
813 case MOUNT_MOUNTING:
814 assert(m->control_pid > 0);
815 mount_set_state(m, MOUNT_MOUNTING_DONE);
816 break;
817 default:
818 break;
819 }
820 else
821 switch (m->state) {
822 case MOUNT_MOUNTING_DONE:
823 assert(m->control_pid > 0);
824 mount_set_state(m, MOUNT_MOUNTING);
825 break;
826 case MOUNT_MOUNTED:
827 assert(m->control_pid == 0);
828 mount_enter_dead(m, MOUNT_SUCCESS);
829 break;
830 default:
831 break;
832 }
833 }
834
835 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
836 Mount *m = MOUNT(u);
837 MountParameters *p;
838
839 assert(m);
840 assert(f);
841
842 p = get_mount_parameters(m);
843
844 fprintf(f,
845 "%sMount State: %s\n"
846 "%sResult: %s\n"
847 "%sClean Result: %s\n"
848 "%sWhere: %s\n"
849 "%sWhat: %s\n"
850 "%sFile System Type: %s\n"
851 "%sOptions: %s\n"
852 "%sFrom /proc/self/mountinfo: %s\n"
853 "%sFrom fragment: %s\n"
854 "%sExtrinsic: %s\n"
855 "%sDirectoryMode: %04o\n"
856 "%sSloppyOptions: %s\n"
857 "%sLazyUnmount: %s\n"
858 "%sForceUnmount: %s\n"
859 "%sReadWriteOnly: %s\n"
860 "%sTimeoutSec: %s\n",
861 prefix, mount_state_to_string(m->state),
862 prefix, mount_result_to_string(m->result),
863 prefix, mount_result_to_string(m->clean_result),
864 prefix, m->where,
865 prefix, p ? strna(p->what) : "n/a",
866 prefix, p ? strna(p->fstype) : "n/a",
867 prefix, p ? strna(p->options) : "n/a",
868 prefix, yes_no(m->from_proc_self_mountinfo),
869 prefix, yes_no(m->from_fragment),
870 prefix, yes_no(mount_is_extrinsic(u)),
871 prefix, m->directory_mode,
872 prefix, yes_no(m->sloppy_options),
873 prefix, yes_no(m->lazy_unmount),
874 prefix, yes_no(m->force_unmount),
875 prefix, yes_no(m->read_write_only),
876 prefix, FORMAT_TIMESPAN(m->timeout_usec, USEC_PER_SEC));
877
878 if (m->control_pid > 0)
879 fprintf(f,
880 "%sControl PID: "PID_FMT"\n",
881 prefix, m->control_pid);
882
883 exec_context_dump(&m->exec_context, f, prefix);
884 kill_context_dump(&m->kill_context, f, prefix);
885 cgroup_context_dump(UNIT(m), f, prefix);
886 }
887
888 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
889
890 _cleanup_(exec_params_clear) ExecParameters exec_params = {
891 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
892 .stdin_fd = -1,
893 .stdout_fd = -1,
894 .stderr_fd = -1,
895 .exec_fd = -1,
896 };
897 pid_t pid;
898 int r;
899
900 assert(m);
901 assert(c);
902 assert(_pid);
903
904 r = unit_prepare_exec(UNIT(m));
905 if (r < 0)
906 return r;
907
908 r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
909 if (r < 0)
910 return r;
911
912 r = unit_set_exec_params(UNIT(m), &exec_params);
913 if (r < 0)
914 return r;
915
916 r = exec_spawn(UNIT(m),
917 c,
918 &m->exec_context,
919 &exec_params,
920 m->exec_runtime,
921 &m->dynamic_creds,
922 &pid);
923 if (r < 0)
924 return r;
925
926 r = unit_watch_pid(UNIT(m), pid, true);
927 if (r < 0)
928 return r;
929
930 *_pid = pid;
931
932 return 0;
933 }
934
935 static void mount_enter_dead(Mount *m, MountResult f) {
936 assert(m);
937
938 if (m->result == MOUNT_SUCCESS)
939 m->result = f;
940
941 unit_log_result(UNIT(m), m->result == MOUNT_SUCCESS, mount_result_to_string(m->result));
942 unit_warn_leftover_processes(UNIT(m), unit_log_leftover_process_stop);
943
944 mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD);
945
946 m->exec_runtime = exec_runtime_unref(m->exec_runtime, true);
947
948 unit_destroy_runtime_data(UNIT(m), &m->exec_context);
949
950 unit_unref_uid_gid(UNIT(m), true);
951
952 dynamic_creds_destroy(&m->dynamic_creds);
953
954 /* Any dependencies based on /proc/self/mountinfo are now stale. Let's re-generate dependencies from
955 * .mount unit. */
956 (void) mount_add_non_exec_dependencies(m);
957 }
958
959 static void mount_enter_mounted(Mount *m, MountResult f) {
960 assert(m);
961
962 if (m->result == MOUNT_SUCCESS)
963 m->result = f;
964
965 mount_set_state(m, MOUNT_MOUNTED);
966 }
967
968 static void mount_enter_dead_or_mounted(Mount *m, MountResult f) {
969 assert(m);
970
971 /* Enter DEAD or MOUNTED state, depending on what the kernel currently says about the mount point. We use this
972 * whenever we executed an operation, so that our internal state reflects what the kernel says again, after all
973 * ultimately we just mirror the kernel's internal state on this. */
974
975 if (m->from_proc_self_mountinfo)
976 mount_enter_mounted(m, f);
977 else
978 mount_enter_dead(m, f);
979 }
980
981 static int state_to_kill_operation(MountState state) {
982 switch (state) {
983
984 case MOUNT_REMOUNTING_SIGTERM:
985 return KILL_RESTART;
986
987 case MOUNT_UNMOUNTING_SIGTERM:
988 return KILL_TERMINATE;
989
990 case MOUNT_REMOUNTING_SIGKILL:
991 case MOUNT_UNMOUNTING_SIGKILL:
992 return KILL_KILL;
993
994 default:
995 return _KILL_OPERATION_INVALID;
996 }
997 }
998
999 static void mount_enter_signal(Mount *m, MountState state, MountResult f) {
1000 int r;
1001
1002 assert(m);
1003
1004 if (m->result == MOUNT_SUCCESS)
1005 m->result = f;
1006
1007 r = unit_kill_context(
1008 UNIT(m),
1009 &m->kill_context,
1010 state_to_kill_operation(state),
1011 -1,
1012 m->control_pid,
1013 false);
1014 if (r < 0)
1015 goto fail;
1016
1017 if (r > 0) {
1018 r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
1019 if (r < 0)
1020 goto fail;
1021
1022 mount_set_state(m, state);
1023 } else if (state == MOUNT_REMOUNTING_SIGTERM && m->kill_context.send_sigkill)
1024 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
1025 else if (IN_SET(state, MOUNT_REMOUNTING_SIGTERM, MOUNT_REMOUNTING_SIGKILL))
1026 mount_enter_mounted(m, MOUNT_SUCCESS);
1027 else if (state == MOUNT_UNMOUNTING_SIGTERM && m->kill_context.send_sigkill)
1028 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS);
1029 else
1030 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1031
1032 return;
1033
1034 fail:
1035 log_unit_warning_errno(UNIT(m), r, "Failed to kill processes: %m");
1036 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
1037 }
1038
1039 static void mount_enter_unmounting(Mount *m) {
1040 int r;
1041
1042 assert(m);
1043
1044 /* Start counting our attempts */
1045 if (!IN_SET(m->state,
1046 MOUNT_UNMOUNTING,
1047 MOUNT_UNMOUNTING_SIGTERM,
1048 MOUNT_UNMOUNTING_SIGKILL))
1049 m->n_retry_umount = 0;
1050
1051 m->control_command_id = MOUNT_EXEC_UNMOUNT;
1052 m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
1053
1054 r = exec_command_set(m->control_command, UMOUNT_PATH, m->where, "-c", NULL);
1055 if (r >= 0 && m->lazy_unmount)
1056 r = exec_command_append(m->control_command, "-l", NULL);
1057 if (r >= 0 && m->force_unmount)
1058 r = exec_command_append(m->control_command, "-f", NULL);
1059 if (r < 0)
1060 goto fail;
1061
1062 mount_unwatch_control_pid(m);
1063
1064 r = mount_spawn(m, m->control_command, &m->control_pid);
1065 if (r < 0)
1066 goto fail;
1067
1068 mount_set_state(m, MOUNT_UNMOUNTING);
1069
1070 return;
1071
1072 fail:
1073 log_unit_warning_errno(UNIT(m), r, "Failed to run 'umount' task: %m");
1074 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
1075 }
1076
1077 static void mount_enter_mounting(Mount *m) {
1078 int r;
1079 MountParameters *p;
1080
1081 assert(m);
1082
1083 r = unit_fail_if_noncanonical(UNIT(m), m->where);
1084 if (r < 0)
1085 goto fail;
1086
1087 (void) mkdir_p_label(m->where, m->directory_mode);
1088
1089 unit_warn_if_dir_nonempty(UNIT(m), m->where);
1090 unit_warn_leftover_processes(UNIT(m), unit_log_leftover_process_start);
1091
1092 m->control_command_id = MOUNT_EXEC_MOUNT;
1093 m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
1094
1095 /* Create the source directory for bind-mounts if needed */
1096 p = get_mount_parameters_fragment(m);
1097 if (p && mount_is_bind(p)) {
1098 r = mkdir_p_label(p->what, m->directory_mode);
1099 /* mkdir_p_label() can return -EEXIST if the target path exists and is not a directory - which is
1100 * totally OK, in case the user wants us to overmount a non-directory inode. Also -EROFS can be
1101 * returned on read-only filesystem. Moreover, -EACCES (and also maybe -EPERM?) may be returned
1102 * when the path is on NFS. See issue #24120. All such errors will be logged in the debug level. */
1103 if (r < 0 && r != -EEXIST)
1104 log_unit_full_errno(UNIT(m),
1105 (r == -EROFS || ERRNO_IS_PRIVILEGE(r)) ? LOG_DEBUG : LOG_WARNING,
1106 r, "Failed to make bind mount source '%s', ignoring: %m", p->what);
1107 }
1108
1109 if (p) {
1110 _cleanup_free_ char *opts = NULL;
1111
1112 r = fstab_filter_options(p->options, "nofail\0" "noauto\0" "auto\0", NULL, NULL, NULL, &opts);
1113 if (r < 0)
1114 goto fail;
1115
1116 r = exec_command_set(m->control_command, MOUNT_PATH, p->what, m->where, NULL);
1117 if (r >= 0 && m->sloppy_options)
1118 r = exec_command_append(m->control_command, "-s", NULL);
1119 if (r >= 0 && m->read_write_only)
1120 r = exec_command_append(m->control_command, "-w", NULL);
1121 if (r >= 0 && p->fstype)
1122 r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
1123 if (r >= 0 && !isempty(opts))
1124 r = exec_command_append(m->control_command, "-o", opts, NULL);
1125 } else
1126 r = -ENOENT;
1127 if (r < 0)
1128 goto fail;
1129
1130 mount_unwatch_control_pid(m);
1131
1132 r = mount_spawn(m, m->control_command, &m->control_pid);
1133 if (r < 0)
1134 goto fail;
1135
1136 mount_set_state(m, MOUNT_MOUNTING);
1137
1138 return;
1139
1140 fail:
1141 log_unit_warning_errno(UNIT(m), r, "Failed to run 'mount' task: %m");
1142 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
1143 }
1144
1145 static void mount_set_reload_result(Mount *m, MountResult result) {
1146 assert(m);
1147
1148 /* Only store the first error we encounter */
1149 if (m->reload_result != MOUNT_SUCCESS)
1150 return;
1151
1152 m->reload_result = result;
1153 }
1154
1155 static void mount_enter_remounting(Mount *m) {
1156 int r;
1157 MountParameters *p;
1158
1159 assert(m);
1160
1161 /* Reset reload result when we are about to start a new remount operation */
1162 m->reload_result = MOUNT_SUCCESS;
1163
1164 m->control_command_id = MOUNT_EXEC_REMOUNT;
1165 m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
1166
1167 p = get_mount_parameters_fragment(m);
1168 if (p) {
1169 const char *o;
1170
1171 if (p->options)
1172 o = strjoina("remount,", p->options);
1173 else
1174 o = "remount";
1175
1176 r = exec_command_set(m->control_command, MOUNT_PATH,
1177 p->what, m->where,
1178 "-o", o, NULL);
1179 if (r >= 0 && m->sloppy_options)
1180 r = exec_command_append(m->control_command, "-s", NULL);
1181 if (r >= 0 && m->read_write_only)
1182 r = exec_command_append(m->control_command, "-w", NULL);
1183 if (r >= 0 && p->fstype)
1184 r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
1185 } else
1186 r = -ENOENT;
1187 if (r < 0)
1188 goto fail;
1189
1190 mount_unwatch_control_pid(m);
1191
1192 r = mount_spawn(m, m->control_command, &m->control_pid);
1193 if (r < 0)
1194 goto fail;
1195
1196 mount_set_state(m, MOUNT_REMOUNTING);
1197
1198 return;
1199
1200 fail:
1201 log_unit_warning_errno(UNIT(m), r, "Failed to run 'remount' task: %m");
1202 mount_set_reload_result(m, MOUNT_FAILURE_RESOURCES);
1203 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1204 }
1205
1206 static void mount_cycle_clear(Mount *m) {
1207 assert(m);
1208
1209 /* Clear all state we shall forget for this new cycle */
1210
1211 m->result = MOUNT_SUCCESS;
1212 m->reload_result = MOUNT_SUCCESS;
1213 exec_command_reset_status_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
1214 UNIT(m)->reset_accounting = true;
1215 }
1216
1217 static int mount_start(Unit *u) {
1218 Mount *m = MOUNT(u);
1219 int r;
1220
1221 assert(m);
1222
1223 /* We cannot fulfill this request right now, try again later
1224 * please! */
1225 if (IN_SET(m->state,
1226 MOUNT_UNMOUNTING,
1227 MOUNT_UNMOUNTING_SIGTERM,
1228 MOUNT_UNMOUNTING_SIGKILL,
1229 MOUNT_CLEANING))
1230 return -EAGAIN;
1231
1232 /* Already on it! */
1233 if (IN_SET(m->state, MOUNT_MOUNTING, MOUNT_MOUNTING_DONE))
1234 return 0;
1235
1236 assert(IN_SET(m->state, MOUNT_DEAD, MOUNT_FAILED));
1237
1238 r = unit_acquire_invocation_id(u);
1239 if (r < 0)
1240 return r;
1241
1242 mount_cycle_clear(m);
1243 mount_enter_mounting(m);
1244
1245 return 1;
1246 }
1247
1248 static int mount_stop(Unit *u) {
1249 Mount *m = MOUNT(u);
1250
1251 assert(m);
1252
1253 switch (m->state) {
1254
1255 case MOUNT_UNMOUNTING:
1256 case MOUNT_UNMOUNTING_SIGKILL:
1257 case MOUNT_UNMOUNTING_SIGTERM:
1258 /* Already on it */
1259 return 0;
1260
1261 case MOUNT_MOUNTING:
1262 case MOUNT_MOUNTING_DONE:
1263 case MOUNT_REMOUNTING:
1264 /* If we are still waiting for /bin/mount, we go directly into kill mode. */
1265 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_SUCCESS);
1266 return 0;
1267
1268 case MOUNT_REMOUNTING_SIGTERM:
1269 /* If we are already waiting for a hung remount, convert this to the matching unmounting state */
1270 mount_set_state(m, MOUNT_UNMOUNTING_SIGTERM);
1271 return 0;
1272
1273 case MOUNT_REMOUNTING_SIGKILL:
1274 /* as above */
1275 mount_set_state(m, MOUNT_UNMOUNTING_SIGKILL);
1276 return 0;
1277
1278 case MOUNT_MOUNTED:
1279 mount_enter_unmounting(m);
1280 return 1;
1281
1282 case MOUNT_CLEANING:
1283 /* If we are currently cleaning, then abort it, brutally. */
1284 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS);
1285 return 0;
1286
1287 default:
1288 assert_not_reached();
1289 }
1290 }
1291
1292 static int mount_reload(Unit *u) {
1293 Mount *m = MOUNT(u);
1294
1295 assert(m);
1296 assert(m->state == MOUNT_MOUNTED);
1297
1298 mount_enter_remounting(m);
1299
1300 return 1;
1301 }
1302
1303 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
1304 Mount *m = MOUNT(u);
1305
1306 assert(m);
1307 assert(f);
1308 assert(fds);
1309
1310 (void) serialize_item(f, "state", mount_state_to_string(m->state));
1311 (void) serialize_item(f, "result", mount_result_to_string(m->result));
1312 (void) serialize_item(f, "reload-result", mount_result_to_string(m->reload_result));
1313 (void) serialize_item_format(f, "n-retry-umount", "%u", m->n_retry_umount);
1314
1315 if (m->control_pid > 0)
1316 (void) serialize_item_format(f, "control-pid", PID_FMT, m->control_pid);
1317
1318 if (m->control_command_id >= 0)
1319 (void) serialize_item(f, "control-command", mount_exec_command_to_string(m->control_command_id));
1320
1321 return 0;
1322 }
1323
1324 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1325 Mount *m = MOUNT(u);
1326 int r;
1327
1328 assert(m);
1329 assert(u);
1330 assert(key);
1331 assert(value);
1332 assert(fds);
1333
1334 if (streq(key, "state")) {
1335 MountState state;
1336
1337 state = mount_state_from_string(value);
1338 if (state < 0)
1339 log_unit_debug_errno(u, state, "Failed to parse state value: %s", value);
1340 else
1341 m->deserialized_state = state;
1342
1343 } else if (streq(key, "result")) {
1344 MountResult f;
1345
1346 f = mount_result_from_string(value);
1347 if (f < 0)
1348 log_unit_debug_errno(u, f, "Failed to parse result value: %s", value);
1349 else if (f != MOUNT_SUCCESS)
1350 m->result = f;
1351
1352 } else if (streq(key, "reload-result")) {
1353 MountResult f;
1354
1355 f = mount_result_from_string(value);
1356 if (f < 0)
1357 log_unit_debug_errno(u, f, "Failed to parse reload result value: %s", value);
1358 else if (f != MOUNT_SUCCESS)
1359 m->reload_result = f;
1360
1361 } else if (streq(key, "n-retry-umount")) {
1362
1363 r = safe_atou(value, &m->n_retry_umount);
1364 if (r < 0)
1365 log_unit_debug_errno(u, r, "Failed to parse n-retry-umount value: %s", value);
1366
1367 } else if (streq(key, "control-pid")) {
1368
1369 r = parse_pid(value, &m->control_pid);
1370 if (r < 0)
1371 log_unit_debug_errno(u, r, "Failed to parse control-pid value: %s", value);
1372
1373 } else if (streq(key, "control-command")) {
1374 MountExecCommand id;
1375
1376 id = mount_exec_command_from_string(value);
1377 if (id < 0)
1378 log_unit_debug_errno(u, id, "Failed to parse exec-command value: %s", value);
1379 else {
1380 m->control_command_id = id;
1381 m->control_command = m->exec_command + id;
1382 }
1383 } else
1384 log_unit_debug(u, "Unknown serialization key: %s", key);
1385
1386 return 0;
1387 }
1388
1389 _pure_ static UnitActiveState mount_active_state(Unit *u) {
1390 assert(u);
1391
1392 return state_translation_table[MOUNT(u)->state];
1393 }
1394
1395 _pure_ static const char *mount_sub_state_to_string(Unit *u) {
1396 assert(u);
1397
1398 return mount_state_to_string(MOUNT(u)->state);
1399 }
1400
1401 _pure_ static bool mount_may_gc(Unit *u) {
1402 Mount *m = MOUNT(u);
1403
1404 assert(m);
1405
1406 if (m->from_proc_self_mountinfo)
1407 return false;
1408
1409 return true;
1410 }
1411
1412 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1413 Mount *m = MOUNT(u);
1414 MountResult f;
1415
1416 assert(m);
1417 assert(pid >= 0);
1418
1419 if (pid != m->control_pid)
1420 return;
1421
1422 /* So here's the thing, we really want to know before /usr/bin/mount or /usr/bin/umount exit whether
1423 * they established/remove a mount. This is important when mounting, but even more so when unmounting
1424 * since we need to deal with nested mounts and otherwise cannot safely determine whether to repeat
1425 * the unmounts. In theory, the kernel fires /proc/self/mountinfo changes off before returning from
1426 * the mount() or umount() syscalls, and thus we should see the changes to the proc file before we
1427 * process the waitid() for the /usr/bin/(u)mount processes. However, this is unfortunately racy: we
1428 * have to waitid() for processes using P_ALL (since we need to reap unexpected children that got
1429 * reparented to PID 1), but when using P_ALL we might end up reaping processes that terminated just
1430 * instants ago, i.e. already after our last event loop iteration (i.e. after the last point we might
1431 * have noticed /proc/self/mountinfo events via epoll). This means event loop priorities for
1432 * processing SIGCHLD vs. /proc/self/mountinfo IO events are not as relevant as we want. To fix that
1433 * race, let's explicitly scan /proc/self/mountinfo before we start processing /usr/bin/(u)mount
1434 * dying. It's ugly, but it makes our ordering systematic again, and makes sure we always see
1435 * /proc/self/mountinfo changes before our mount/umount exits. */
1436 (void) mount_process_proc_self_mountinfo(u->manager);
1437
1438 m->control_pid = 0;
1439
1440 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
1441 f = MOUNT_SUCCESS;
1442 else if (code == CLD_EXITED)
1443 f = MOUNT_FAILURE_EXIT_CODE;
1444 else if (code == CLD_KILLED)
1445 f = MOUNT_FAILURE_SIGNAL;
1446 else if (code == CLD_DUMPED)
1447 f = MOUNT_FAILURE_CORE_DUMP;
1448 else
1449 assert_not_reached();
1450
1451 if (IN_SET(m->state, MOUNT_REMOUNTING, MOUNT_REMOUNTING_SIGKILL, MOUNT_REMOUNTING_SIGTERM))
1452 mount_set_reload_result(m, f);
1453 else if (m->result == MOUNT_SUCCESS)
1454 m->result = f;
1455
1456 if (m->control_command) {
1457 exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status);
1458
1459 m->control_command = NULL;
1460 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1461 }
1462
1463 unit_log_process_exit(
1464 u,
1465 "Mount process",
1466 mount_exec_command_to_string(m->control_command_id),
1467 f == MOUNT_SUCCESS,
1468 code, status);
1469
1470 /* Note that due to the io event priority logic, we can be sure the new mountinfo is loaded
1471 * before we process the SIGCHLD for the mount command. */
1472
1473 switch (m->state) {
1474
1475 case MOUNT_MOUNTING:
1476 /* Our mount point has not appeared in mountinfo. Something went wrong. */
1477
1478 if (f == MOUNT_SUCCESS) {
1479 /* Either /bin/mount has an unexpected definition of success,
1480 * or someone raced us and we lost. */
1481 log_unit_warning(UNIT(m), "Mount process finished, but there is no mount.");
1482 f = MOUNT_FAILURE_PROTOCOL;
1483 }
1484 mount_enter_dead(m, f);
1485 break;
1486
1487 case MOUNT_MOUNTING_DONE:
1488 mount_enter_mounted(m, f);
1489 break;
1490
1491 case MOUNT_REMOUNTING:
1492 case MOUNT_REMOUNTING_SIGTERM:
1493 case MOUNT_REMOUNTING_SIGKILL:
1494 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1495 break;
1496
1497 case MOUNT_UNMOUNTING:
1498
1499 if (f == MOUNT_SUCCESS && m->from_proc_self_mountinfo) {
1500
1501 /* Still a mount point? If so, let's try again. Most likely there were multiple mount points
1502 * stacked on top of each other. We might exceed the timeout specified by the user overall,
1503 * but we will stop as soon as any one umount times out. */
1504
1505 if (m->n_retry_umount < RETRY_UMOUNT_MAX) {
1506 log_unit_debug(u, "Mount still present, trying again.");
1507 m->n_retry_umount++;
1508 mount_enter_unmounting(m);
1509 } else {
1510 log_unit_warning(u, "Mount still present after %u attempts to unmount, giving up.", m->n_retry_umount);
1511 mount_enter_mounted(m, f);
1512 }
1513 } else
1514 mount_enter_dead_or_mounted(m, f);
1515
1516 break;
1517
1518 case MOUNT_UNMOUNTING_SIGKILL:
1519 case MOUNT_UNMOUNTING_SIGTERM:
1520 mount_enter_dead_or_mounted(m, f);
1521 break;
1522
1523 case MOUNT_CLEANING:
1524 if (m->clean_result == MOUNT_SUCCESS)
1525 m->clean_result = f;
1526
1527 mount_enter_dead(m, MOUNT_SUCCESS);
1528 break;
1529
1530 default:
1531 assert_not_reached();
1532 }
1533
1534 /* Notify clients about changed exit status */
1535 unit_add_to_dbus_queue(u);
1536 }
1537
1538 static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
1539 Mount *m = MOUNT(userdata);
1540
1541 assert(m);
1542 assert(m->timer_event_source == source);
1543
1544 switch (m->state) {
1545
1546 case MOUNT_MOUNTING:
1547 case MOUNT_MOUNTING_DONE:
1548 log_unit_warning(UNIT(m), "Mounting timed out. Terminating.");
1549 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1550 break;
1551
1552 case MOUNT_REMOUNTING:
1553 log_unit_warning(UNIT(m), "Remounting timed out. Terminating remount process.");
1554 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1555 mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, MOUNT_SUCCESS);
1556 break;
1557
1558 case MOUNT_REMOUNTING_SIGTERM:
1559 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1560
1561 if (m->kill_context.send_sigkill) {
1562 log_unit_warning(UNIT(m), "Remounting timed out. Killing.");
1563 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
1564 } else {
1565 log_unit_warning(UNIT(m), "Remounting timed out. Skipping SIGKILL. Ignoring.");
1566 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1567 }
1568 break;
1569
1570 case MOUNT_REMOUNTING_SIGKILL:
1571 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1572
1573 log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
1574 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1575 break;
1576
1577 case MOUNT_UNMOUNTING:
1578 log_unit_warning(UNIT(m), "Unmounting timed out. Terminating.");
1579 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1580 break;
1581
1582 case MOUNT_UNMOUNTING_SIGTERM:
1583 if (m->kill_context.send_sigkill) {
1584 log_unit_warning(UNIT(m), "Mount process timed out. Killing.");
1585 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
1586 } else {
1587 log_unit_warning(UNIT(m), "Mount process timed out. Skipping SIGKILL. Ignoring.");
1588 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
1589 }
1590 break;
1591
1592 case MOUNT_UNMOUNTING_SIGKILL:
1593 log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
1594 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
1595 break;
1596
1597 case MOUNT_CLEANING:
1598 log_unit_warning(UNIT(m), "Cleaning timed out. killing.");
1599
1600 if (m->clean_result == MOUNT_SUCCESS)
1601 m->clean_result = MOUNT_FAILURE_TIMEOUT;
1602
1603 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, 0);
1604 break;
1605
1606 default:
1607 assert_not_reached();
1608 }
1609
1610 return 0;
1611 }
1612
1613 static int mount_setup_new_unit(
1614 Manager *m,
1615 const char *name,
1616 const char *what,
1617 const char *where,
1618 const char *options,
1619 const char *fstype,
1620 MountProcFlags *ret_flags,
1621 Unit **ret) {
1622
1623 _cleanup_(unit_freep) Unit *u = NULL;
1624 int r;
1625
1626 assert(m);
1627 assert(name);
1628 assert(ret_flags);
1629 assert(ret);
1630
1631 r = unit_new_for_name(m, sizeof(Mount), name, &u);
1632 if (r < 0)
1633 return r;
1634
1635 r = free_and_strdup(&u->source_path, "/proc/self/mountinfo");
1636 if (r < 0)
1637 return r;
1638
1639 r = free_and_strdup(&MOUNT(u)->where, where);
1640 if (r < 0)
1641 return r;
1642
1643 r = update_parameters_proc_self_mountinfo(MOUNT(u), what, options, fstype);
1644 if (r < 0)
1645 return r;
1646
1647 /* This unit was generated because /proc/self/mountinfo reported it. Remember this, so that by the
1648 * time we load the unit file for it (and thus add in extra deps right after) we know what source to
1649 * attributes the deps to. */
1650 MOUNT(u)->from_proc_self_mountinfo = true;
1651
1652 r = mount_add_non_exec_dependencies(MOUNT(u));
1653 if (r < 0)
1654 return r;
1655
1656 /* We have only allocated the stub now, let's enqueue this unit for loading now, so that everything
1657 * else is loaded in now. */
1658 unit_add_to_load_queue(u);
1659
1660 *ret_flags = MOUNT_PROC_IS_MOUNTED | MOUNT_PROC_JUST_MOUNTED | MOUNT_PROC_JUST_CHANGED;
1661 *ret = TAKE_PTR(u);
1662 return 0;
1663 }
1664
1665 static int mount_setup_existing_unit(
1666 Unit *u,
1667 const char *what,
1668 const char *where,
1669 const char *options,
1670 const char *fstype,
1671 MountProcFlags *ret_flags) {
1672
1673 int r;
1674
1675 assert(u);
1676 assert(ret_flags);
1677
1678 if (!MOUNT(u)->where) {
1679 MOUNT(u)->where = strdup(where);
1680 if (!MOUNT(u)->where)
1681 return -ENOMEM;
1682 }
1683
1684 /* In case we have multiple mounts established on the same mount point, let's merge flags set already
1685 * for the current unit. Note that the flags field is reset on each iteration of reading
1686 * /proc/self/mountinfo, hence we know for sure anything already set here is from the current
1687 * iteration and thus worthy of taking into account. */
1688 MountProcFlags flags =
1689 MOUNT(u)->proc_flags | MOUNT_PROC_IS_MOUNTED;
1690
1691 r = update_parameters_proc_self_mountinfo(MOUNT(u), what, options, fstype);
1692 if (r < 0)
1693 return r;
1694 if (r > 0)
1695 flags |= MOUNT_PROC_JUST_CHANGED;
1696
1697 /* There are two conditions when we consider a mount point just mounted: when we haven't seen it in
1698 * /proc/self/mountinfo before or when MOUNT_MOUNTING is our current state. Why bother with the
1699 * latter? Shouldn't that be covered by the former? No, during reload it is not because we might then
1700 * encounter a new /proc/self/mountinfo in combination with an old mount unit state (since it stems
1701 * from the serialized state), and need to catch up. Since we know that the MOUNT_MOUNTING state is
1702 * reached when we wait for the mount to appear we hence can assume that if we are in it, we are
1703 * actually seeing it established for the first time. */
1704 if (!MOUNT(u)->from_proc_self_mountinfo || MOUNT(u)->state == MOUNT_MOUNTING)
1705 flags |= MOUNT_PROC_JUST_MOUNTED;
1706
1707 MOUNT(u)->from_proc_self_mountinfo = true;
1708
1709 if (IN_SET(u->load_state, UNIT_NOT_FOUND, UNIT_BAD_SETTING, UNIT_ERROR)) {
1710 /* The unit was previously not found or otherwise not loaded. Now that the unit shows up in
1711 * /proc/self/mountinfo we should reconsider it this, hence set it to UNIT_LOADED. */
1712 u->load_state = UNIT_LOADED;
1713 u->load_error = 0;
1714
1715 flags |= MOUNT_PROC_JUST_CHANGED;
1716 }
1717
1718 if (FLAGS_SET(flags, MOUNT_PROC_JUST_CHANGED)) {
1719 /* If things changed, then make sure that all deps are regenerated. Let's
1720 * first remove all automatic deps, and then add in the new ones. */
1721 r = mount_add_non_exec_dependencies(MOUNT(u));
1722 if (r < 0)
1723 return r;
1724 }
1725
1726 *ret_flags = flags;
1727 return 0;
1728 }
1729
1730 static int mount_setup_unit(
1731 Manager *m,
1732 const char *what,
1733 const char *where,
1734 const char *options,
1735 const char *fstype,
1736 bool set_flags) {
1737
1738 _cleanup_free_ char *e = NULL;
1739 MountProcFlags flags;
1740 Unit *u;
1741 int r;
1742
1743 assert(m);
1744 assert(what);
1745 assert(where);
1746 assert(options);
1747 assert(fstype);
1748
1749 /* Ignore API mount points. They should never be referenced in
1750 * dependencies ever. */
1751 if (mount_point_is_api(where) || mount_point_ignore(where))
1752 return 0;
1753
1754 if (streq(fstype, "autofs"))
1755 return 0;
1756
1757 /* probably some kind of swap, ignore */
1758 if (!is_path(where))
1759 return 0;
1760
1761 r = unit_name_from_path(where, ".mount", &e);
1762 if (r < 0)
1763 return log_struct_errno(
1764 LOG_WARNING, r,
1765 "MESSAGE_ID=" SD_MESSAGE_MOUNT_POINT_PATH_NOT_SUITABLE_STR,
1766 "MOUNT_POINT=%s", where,
1767 LOG_MESSAGE("Failed to generate valid unit name from mount point path '%s', ignoring mount point: %m",
1768 where));
1769
1770 u = manager_get_unit(m, e);
1771 if (u)
1772 r = mount_setup_existing_unit(u, what, where, options, fstype, &flags);
1773 else
1774 /* First time we see this mount point meaning that it's not been initiated by a mount unit
1775 * but rather by the sysadmin having called mount(8) directly. */
1776 r = mount_setup_new_unit(m, e, what, where, options, fstype, &flags, &u);
1777 if (r < 0)
1778 return log_warning_errno(r, "Failed to set up mount unit for '%s': %m", where);
1779
1780 /* If the mount changed properties or state, let's notify our clients */
1781 if (flags & (MOUNT_PROC_JUST_CHANGED|MOUNT_PROC_JUST_MOUNTED))
1782 unit_add_to_dbus_queue(u);
1783
1784 if (set_flags)
1785 MOUNT(u)->proc_flags = flags;
1786
1787 return 0;
1788 }
1789
1790 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1791 _cleanup_(mnt_free_tablep) struct libmnt_table *table = NULL;
1792 _cleanup_(mnt_free_iterp) struct libmnt_iter *iter = NULL;
1793 int r;
1794
1795 assert(m);
1796
1797 r = libmount_parse(NULL, NULL, &table, &iter);
1798 if (r < 0)
1799 return log_error_errno(r, "Failed to parse /proc/self/mountinfo: %m");
1800
1801 for (;;) {
1802 struct libmnt_fs *fs;
1803 const char *device, *path, *options, *fstype;
1804
1805 r = mnt_table_next_fs(table, iter, &fs);
1806 if (r == 1)
1807 break;
1808 if (r < 0)
1809 return log_error_errno(r, "Failed to get next entry from /proc/self/mountinfo: %m");
1810
1811 device = mnt_fs_get_source(fs);
1812 path = mnt_fs_get_target(fs);
1813 options = mnt_fs_get_options(fs);
1814 fstype = mnt_fs_get_fstype(fs);
1815
1816 if (!device || !path)
1817 continue;
1818
1819 device_found_node(m, device, DEVICE_FOUND_MOUNT, DEVICE_FOUND_MOUNT);
1820
1821 (void) mount_setup_unit(m, device, path, options, fstype, set_flags);
1822 }
1823
1824 return 0;
1825 }
1826
1827 static void mount_shutdown(Manager *m) {
1828 assert(m);
1829
1830 m->mount_event_source = sd_event_source_disable_unref(m->mount_event_source);
1831
1832 mnt_unref_monitor(m->mount_monitor);
1833 m->mount_monitor = NULL;
1834 }
1835
1836 static int mount_get_timeout(Unit *u, usec_t *timeout) {
1837 Mount *m = MOUNT(u);
1838 usec_t t;
1839 int r;
1840
1841 assert(m);
1842 assert(u);
1843
1844 if (!m->timer_event_source)
1845 return 0;
1846
1847 r = sd_event_source_get_time(m->timer_event_source, &t);
1848 if (r < 0)
1849 return r;
1850 if (t == USEC_INFINITY)
1851 return 0;
1852
1853 *timeout = t;
1854 return 1;
1855 }
1856
1857 static void mount_enumerate_perpetual(Manager *m) {
1858 Unit *u;
1859 int r;
1860
1861 assert(m);
1862
1863 /* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's
1864 * unconditionally synthesize it here and mark it as perpetual. */
1865
1866 u = manager_get_unit(m, SPECIAL_ROOT_MOUNT);
1867 if (!u) {
1868 r = unit_new_for_name(m, sizeof(Mount), SPECIAL_ROOT_MOUNT, &u);
1869 if (r < 0) {
1870 log_error_errno(r, "Failed to allocate the special " SPECIAL_ROOT_MOUNT " unit: %m");
1871 return;
1872 }
1873 }
1874
1875 u->perpetual = true;
1876 MOUNT(u)->deserialized_state = MOUNT_MOUNTED;
1877
1878 unit_add_to_load_queue(u);
1879 unit_add_to_dbus_queue(u);
1880 }
1881
1882 static bool mount_is_mounted(Mount *m) {
1883 assert(m);
1884
1885 return UNIT(m)->perpetual || FLAGS_SET(m->proc_flags, MOUNT_PROC_IS_MOUNTED);
1886 }
1887
1888 static int mount_on_ratelimit_expire(sd_event_source *s, void *userdata) {
1889 Manager *m = ASSERT_PTR(userdata);
1890 Job *j;
1891
1892 /* Let's enqueue all start jobs that were previously skipped because of active ratelimit. */
1893 HASHMAP_FOREACH(j, m->jobs) {
1894 if (j->unit->type != UNIT_MOUNT)
1895 continue;
1896
1897 job_add_to_run_queue(j);
1898 }
1899
1900 /* By entering ratelimited state we made all mount start jobs not runnable, now rate limit is over so
1901 * let's make sure we dispatch them in the next iteration. */
1902 manager_trigger_run_queue(m);
1903
1904 return 0;
1905 }
1906
1907 static void mount_enumerate(Manager *m) {
1908 int r;
1909
1910 assert(m);
1911
1912 mnt_init_debug(0);
1913
1914 if (!m->mount_monitor) {
1915 int fd;
1916
1917 m->mount_monitor = mnt_new_monitor();
1918 if (!m->mount_monitor) {
1919 log_oom();
1920 goto fail;
1921 }
1922
1923 r = mnt_monitor_enable_kernel(m->mount_monitor, 1);
1924 if (r < 0) {
1925 log_error_errno(r, "Failed to enable watching of kernel mount events: %m");
1926 goto fail;
1927 }
1928
1929 r = mnt_monitor_enable_userspace(m->mount_monitor, 1, NULL);
1930 if (r < 0) {
1931 log_error_errno(r, "Failed to enable watching of userspace mount events: %m");
1932 goto fail;
1933 }
1934
1935 /* mnt_unref_monitor() will close the fd */
1936 fd = r = mnt_monitor_get_fd(m->mount_monitor);
1937 if (r < 0) {
1938 log_error_errno(r, "Failed to acquire watch file descriptor: %m");
1939 goto fail;
1940 }
1941
1942 r = sd_event_add_io(m->event, &m->mount_event_source, fd, EPOLLIN, mount_dispatch_io, m);
1943 if (r < 0) {
1944 log_error_errno(r, "Failed to watch mount file descriptor: %m");
1945 goto fail;
1946 }
1947
1948 r = sd_event_source_set_priority(m->mount_event_source, SD_EVENT_PRIORITY_NORMAL-10);
1949 if (r < 0) {
1950 log_error_errno(r, "Failed to adjust mount watch priority: %m");
1951 goto fail;
1952 }
1953
1954 r = sd_event_source_set_ratelimit(m->mount_event_source, 1 * USEC_PER_SEC, 5);
1955 if (r < 0) {
1956 log_error_errno(r, "Failed to enable rate limit for mount events: %m");
1957 goto fail;
1958 }
1959
1960 r = sd_event_source_set_ratelimit_expire_callback(m->mount_event_source, mount_on_ratelimit_expire);
1961 if (r < 0) {
1962 log_error_errno(r, "Failed to enable rate limit for mount events: %m");
1963 goto fail;
1964 }
1965
1966 (void) sd_event_source_set_description(m->mount_event_source, "mount-monitor-dispatch");
1967 }
1968
1969 r = mount_load_proc_self_mountinfo(m, false);
1970 if (r < 0)
1971 goto fail;
1972
1973 return;
1974
1975 fail:
1976 mount_shutdown(m);
1977 }
1978
1979 static int drain_libmount(Manager *m) {
1980 bool rescan = false;
1981 int r;
1982
1983 assert(m);
1984
1985 /* Drain all events and verify that the event is valid.
1986 *
1987 * Note that libmount also monitors /run/mount mkdir if the directory does not exist yet. The mkdir
1988 * may generate event which is irrelevant for us.
1989 *
1990 * error: r < 0; valid: r == 0, false positive: r == 1 */
1991 do {
1992 r = mnt_monitor_next_change(m->mount_monitor, NULL, NULL);
1993 if (r < 0)
1994 return log_error_errno(r, "Failed to drain libmount events: %m");
1995 if (r == 0)
1996 rescan = true;
1997 } while (r == 0);
1998
1999 return rescan;
2000 }
2001
2002 static int mount_process_proc_self_mountinfo(Manager *m) {
2003 _cleanup_set_free_ Set *around = NULL, *gone = NULL;
2004 const char *what;
2005 int r;
2006
2007 assert(m);
2008
2009 r = drain_libmount(m);
2010 if (r <= 0)
2011 return r;
2012
2013 r = mount_load_proc_self_mountinfo(m, true);
2014 if (r < 0) {
2015 /* Reset flags, just in case, for later calls */
2016 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT])
2017 MOUNT(u)->proc_flags = 0;
2018
2019 return 0;
2020 }
2021
2022 manager_dispatch_load_queue(m);
2023
2024 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
2025 Mount *mount = MOUNT(u);
2026
2027 if (!mount_is_mounted(mount)) {
2028
2029 /* A mount point is not around right now. It
2030 * might be gone, or might never have
2031 * existed. */
2032
2033 if (mount->from_proc_self_mountinfo &&
2034 mount->parameters_proc_self_mountinfo.what)
2035 /* Remember that this device might just have disappeared */
2036 if (set_put_strdup_full(&gone, &path_hash_ops_free, mount->parameters_proc_self_mountinfo.what) < 0)
2037 log_oom(); /* we don't care too much about OOM here... */
2038
2039 mount->from_proc_self_mountinfo = false;
2040 assert_se(update_parameters_proc_self_mountinfo(mount, NULL, NULL, NULL) >= 0);
2041
2042 switch (mount->state) {
2043
2044 case MOUNT_MOUNTED:
2045 /* This has just been unmounted by somebody else, follow the state change. */
2046 mount_enter_dead(mount, MOUNT_SUCCESS);
2047 break;
2048
2049 case MOUNT_MOUNTING_DONE:
2050 /* The mount command may add the corresponding proc mountinfo entry and
2051 * then remove it because of an internal error. E.g., fuse.sshfs seems
2052 * to do that when the connection fails. See #17617. To handle such the
2053 * case, let's once set the state back to mounting. Then, the unit can
2054 * correctly enter the failed state later in mount_sigchld(). */
2055 mount_set_state(mount, MOUNT_MOUNTING);
2056 break;
2057
2058 default:
2059 break;
2060 }
2061
2062 } else if (mount->proc_flags & (MOUNT_PROC_JUST_MOUNTED|MOUNT_PROC_JUST_CHANGED)) {
2063
2064 /* A mount point was added or changed */
2065
2066 switch (mount->state) {
2067
2068 case MOUNT_DEAD:
2069 case MOUNT_FAILED:
2070
2071 /* This has just been mounted by somebody else, follow the state change, but let's
2072 * generate a new invocation ID for this implicitly and automatically. */
2073 (void) unit_acquire_invocation_id(u);
2074 mount_cycle_clear(mount);
2075 mount_enter_mounted(mount, MOUNT_SUCCESS);
2076 break;
2077
2078 case MOUNT_MOUNTING:
2079 mount_set_state(mount, MOUNT_MOUNTING_DONE);
2080 break;
2081
2082 default:
2083 /* Nothing really changed, but let's
2084 * issue an notification call
2085 * nonetheless, in case somebody is
2086 * waiting for this. (e.g. file system
2087 * ro/rw remounts.) */
2088 mount_set_state(mount, mount->state);
2089 break;
2090 }
2091 }
2092
2093 if (mount_is_mounted(mount) &&
2094 mount->from_proc_self_mountinfo &&
2095 mount->parameters_proc_self_mountinfo.what)
2096 /* Track devices currently used */
2097 if (set_put_strdup_full(&around, &path_hash_ops_free, mount->parameters_proc_self_mountinfo.what) < 0)
2098 log_oom();
2099
2100 /* Reset the flags for later calls */
2101 mount->proc_flags = 0;
2102 }
2103
2104 SET_FOREACH(what, gone) {
2105 if (set_contains(around, what))
2106 continue;
2107
2108 /* Let the device units know that the device is no longer mounted */
2109 device_found_node(m, what, DEVICE_NOT_FOUND, DEVICE_FOUND_MOUNT);
2110 }
2111
2112 return 0;
2113 }
2114
2115 static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2116 Manager *m = ASSERT_PTR(userdata);
2117
2118 assert(revents & EPOLLIN);
2119
2120 return mount_process_proc_self_mountinfo(m);
2121 }
2122
2123 static void mount_reset_failed(Unit *u) {
2124 Mount *m = MOUNT(u);
2125
2126 assert(m);
2127
2128 if (m->state == MOUNT_FAILED)
2129 mount_set_state(m, MOUNT_DEAD);
2130
2131 m->result = MOUNT_SUCCESS;
2132 m->reload_result = MOUNT_SUCCESS;
2133 m->clean_result = MOUNT_SUCCESS;
2134 }
2135
2136 static int mount_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
2137 Mount *m = MOUNT(u);
2138
2139 assert(m);
2140
2141 return unit_kill_common(u, who, signo, -1, m->control_pid, error);
2142 }
2143
2144 static int mount_control_pid(Unit *u) {
2145 Mount *m = MOUNT(u);
2146
2147 assert(m);
2148
2149 return m->control_pid;
2150 }
2151
2152 static int mount_clean(Unit *u, ExecCleanMask mask) {
2153 _cleanup_strv_free_ char **l = NULL;
2154 Mount *m = MOUNT(u);
2155 int r;
2156
2157 assert(m);
2158 assert(mask != 0);
2159
2160 if (m->state != MOUNT_DEAD)
2161 return -EBUSY;
2162
2163 r = exec_context_get_clean_directories(&m->exec_context, u->manager->prefix, mask, &l);
2164 if (r < 0)
2165 return r;
2166
2167 if (strv_isempty(l))
2168 return -EUNATCH;
2169
2170 mount_unwatch_control_pid(m);
2171 m->clean_result = MOUNT_SUCCESS;
2172 m->control_command = NULL;
2173 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
2174
2175 r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->exec_context.timeout_clean_usec));
2176 if (r < 0)
2177 goto fail;
2178
2179 r = unit_fork_and_watch_rm_rf(u, l, &m->control_pid);
2180 if (r < 0)
2181 goto fail;
2182
2183 mount_set_state(m, MOUNT_CLEANING);
2184
2185 return 0;
2186
2187 fail:
2188 log_unit_warning_errno(u, r, "Failed to initiate cleaning: %m");
2189 m->clean_result = MOUNT_FAILURE_RESOURCES;
2190 m->timer_event_source = sd_event_source_disable_unref(m->timer_event_source);
2191 return r;
2192 }
2193
2194 static int mount_can_clean(Unit *u, ExecCleanMask *ret) {
2195 Mount *m = MOUNT(u);
2196
2197 assert(m);
2198
2199 return exec_context_get_clean_mask(&m->exec_context, ret);
2200 }
2201
2202 static int mount_can_start(Unit *u) {
2203 Mount *m = MOUNT(u);
2204 int r;
2205
2206 assert(m);
2207
2208 r = unit_test_start_limit(u);
2209 if (r < 0) {
2210 mount_enter_dead(m, MOUNT_FAILURE_START_LIMIT_HIT);
2211 return r;
2212 }
2213
2214 return 1;
2215 }
2216
2217 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
2218 [MOUNT_EXEC_MOUNT] = "ExecMount",
2219 [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
2220 [MOUNT_EXEC_REMOUNT] = "ExecRemount",
2221 };
2222
2223 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
2224
2225 static const char* const mount_result_table[_MOUNT_RESULT_MAX] = {
2226 [MOUNT_SUCCESS] = "success",
2227 [MOUNT_FAILURE_RESOURCES] = "resources",
2228 [MOUNT_FAILURE_TIMEOUT] = "timeout",
2229 [MOUNT_FAILURE_EXIT_CODE] = "exit-code",
2230 [MOUNT_FAILURE_SIGNAL] = "signal",
2231 [MOUNT_FAILURE_CORE_DUMP] = "core-dump",
2232 [MOUNT_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
2233 [MOUNT_FAILURE_PROTOCOL] = "protocol",
2234 };
2235
2236 DEFINE_STRING_TABLE_LOOKUP(mount_result, MountResult);
2237
2238 const UnitVTable mount_vtable = {
2239 .object_size = sizeof(Mount),
2240 .exec_context_offset = offsetof(Mount, exec_context),
2241 .cgroup_context_offset = offsetof(Mount, cgroup_context),
2242 .kill_context_offset = offsetof(Mount, kill_context),
2243 .exec_runtime_offset = offsetof(Mount, exec_runtime),
2244 .dynamic_creds_offset = offsetof(Mount, dynamic_creds),
2245
2246 .sections =
2247 "Unit\0"
2248 "Mount\0"
2249 "Install\0",
2250 .private_section = "Mount",
2251
2252 .can_transient = true,
2253 .can_fail = true,
2254 .exclude_from_switch_root_serialization = true,
2255
2256 .init = mount_init,
2257 .load = mount_load,
2258 .done = mount_done,
2259
2260 .coldplug = mount_coldplug,
2261 .catchup = mount_catchup,
2262
2263 .dump = mount_dump,
2264
2265 .start = mount_start,
2266 .stop = mount_stop,
2267 .reload = mount_reload,
2268
2269 .kill = mount_kill,
2270 .clean = mount_clean,
2271 .can_clean = mount_can_clean,
2272
2273 .serialize = mount_serialize,
2274 .deserialize_item = mount_deserialize_item,
2275
2276 .active_state = mount_active_state,
2277 .sub_state_to_string = mount_sub_state_to_string,
2278
2279 .will_restart = unit_will_restart_default,
2280
2281 .may_gc = mount_may_gc,
2282 .is_extrinsic = mount_is_extrinsic,
2283
2284 .sigchld_event = mount_sigchld_event,
2285
2286 .reset_failed = mount_reset_failed,
2287
2288 .control_pid = mount_control_pid,
2289
2290 .bus_set_property = bus_mount_set_property,
2291 .bus_commit_properties = bus_mount_commit_properties,
2292
2293 .get_timeout = mount_get_timeout,
2294
2295 .enumerate_perpetual = mount_enumerate_perpetual,
2296 .enumerate = mount_enumerate,
2297 .shutdown = mount_shutdown,
2298
2299 .status_message_formats = {
2300 .starting_stopping = {
2301 [0] = "Mounting %s...",
2302 [1] = "Unmounting %s...",
2303 },
2304 .finished_start_job = {
2305 [JOB_DONE] = "Mounted %s.",
2306 [JOB_FAILED] = "Failed to mount %s.",
2307 [JOB_TIMEOUT] = "Timed out mounting %s.",
2308 },
2309 .finished_stop_job = {
2310 [JOB_DONE] = "Unmounted %s.",
2311 [JOB_FAILED] = "Failed unmounting %s.",
2312 [JOB_TIMEOUT] = "Timed out unmounting %s.",
2313 },
2314 },
2315
2316 .can_start = mount_can_start,
2317 };
Unnamed repository; edit this file 'description' to name the repository.