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mount: document that mount_add_extras() must work with active units, too
[thirdparty/systemd.git] / src / core / mount.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <errno.h>
4 #include <signal.h>
5 #include <stdio.h>
6 #include <sys/epoll.h>
7
8 #include <libmount.h>
9
10 #include "sd-messages.h"
11
12 #include "alloc-util.h"
13 #include "dbus-mount.h"
14 #include "dbus-unit.h"
15 #include "device.h"
16 #include "escape.h"
17 #include "exit-status.h"
18 #include "format-util.h"
19 #include "fstab-util.h"
20 #include "log.h"
21 #include "manager.h"
22 #include "mkdir.h"
23 #include "mount-setup.h"
24 #include "mount.h"
25 #include "mountpoint-util.h"
26 #include "parse-util.h"
27 #include "path-util.h"
28 #include "process-util.h"
29 #include "serialize.h"
30 #include "special.h"
31 #include "string-table.h"
32 #include "string-util.h"
33 #include "strv.h"
34 #include "unit-name.h"
35 #include "unit.h"
36
37 #define RETRY_UMOUNT_MAX 32
38
39 DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_table*, mnt_free_table);
40 DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_iter*, mnt_free_iter);
41
42 static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
43 [MOUNT_DEAD] = UNIT_INACTIVE,
44 [MOUNT_MOUNTING] = UNIT_ACTIVATING,
45 [MOUNT_MOUNTING_DONE] = UNIT_ACTIVATING,
46 [MOUNT_MOUNTED] = UNIT_ACTIVE,
47 [MOUNT_REMOUNTING] = UNIT_RELOADING,
48 [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
49 [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING,
50 [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING,
51 [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
52 [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
53 [MOUNT_FAILED] = UNIT_FAILED
54 };
55
56 static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
57 static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
58
59 static bool MOUNT_STATE_WITH_PROCESS(MountState state) {
60 return IN_SET(state,
61 MOUNT_MOUNTING,
62 MOUNT_MOUNTING_DONE,
63 MOUNT_REMOUNTING,
64 MOUNT_REMOUNTING_SIGTERM,
65 MOUNT_REMOUNTING_SIGKILL,
66 MOUNT_UNMOUNTING,
67 MOUNT_UNMOUNTING_SIGTERM,
68 MOUNT_UNMOUNTING_SIGKILL);
69 }
70
71 static bool mount_is_network(const MountParameters *p) {
72 assert(p);
73
74 if (fstab_test_option(p->options, "_netdev\0"))
75 return true;
76
77 if (p->fstype && fstype_is_network(p->fstype))
78 return true;
79
80 return false;
81 }
82
83 static bool mount_is_loop(const MountParameters *p) {
84 assert(p);
85
86 if (fstab_test_option(p->options, "loop\0"))
87 return true;
88
89 return false;
90 }
91
92 static bool mount_is_bind(const MountParameters *p) {
93 assert(p);
94
95 if (fstab_test_option(p->options, "bind\0" "rbind\0"))
96 return true;
97
98 if (p->fstype && STR_IN_SET(p->fstype, "bind", "rbind"))
99 return true;
100
101 return false;
102 }
103
104 static bool mount_is_auto(const MountParameters *p) {
105 assert(p);
106
107 return !fstab_test_option(p->options, "noauto\0");
108 }
109
110 static bool mount_is_automount(const MountParameters *p) {
111 assert(p);
112
113 return fstab_test_option(p->options,
114 "comment=systemd.automount\0"
115 "x-systemd.automount\0");
116 }
117
118 static bool mount_is_bound_to_device(const Mount *m) {
119 const MountParameters *p;
120
121 if (m->from_fragment)
122 return true;
123
124 p = &m->parameters_proc_self_mountinfo;
125 return fstab_test_option(p->options, "x-systemd.device-bound\0");
126 }
127
128 static bool mount_needs_quota(const MountParameters *p) {
129 assert(p);
130
131 /* Quotas are not enabled on network filesystems, but we want them, for example, on storage connected via
132 * iscsi. We hence don't use mount_is_network() here, as that would also return true for _netdev devices. */
133 if (p->fstype && fstype_is_network(p->fstype))
134 return false;
135
136 if (mount_is_bind(p))
137 return false;
138
139 return fstab_test_option(p->options,
140 "usrquota\0" "grpquota\0" "quota\0" "usrjquota\0" "grpjquota\0");
141 }
142
143 static void mount_init(Unit *u) {
144 Mount *m = MOUNT(u);
145
146 assert(u);
147 assert(u->load_state == UNIT_STUB);
148
149 m->timeout_usec = u->manager->default_timeout_start_usec;
150
151 m->exec_context.std_output = u->manager->default_std_output;
152 m->exec_context.std_error = u->manager->default_std_error;
153
154 m->directory_mode = 0755;
155
156 /* We need to make sure that /usr/bin/mount is always called
157 * in the same process group as us, so that the autofs kernel
158 * side doesn't send us another mount request while we are
159 * already trying to comply its last one. */
160 m->exec_context.same_pgrp = true;
161
162 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
163
164 u->ignore_on_isolate = true;
165 }
166
167 static int mount_arm_timer(Mount *m, usec_t usec) {
168 int r;
169
170 assert(m);
171
172 if (m->timer_event_source) {
173 r = sd_event_source_set_time(m->timer_event_source, usec);
174 if (r < 0)
175 return r;
176
177 return sd_event_source_set_enabled(m->timer_event_source, SD_EVENT_ONESHOT);
178 }
179
180 if (usec == USEC_INFINITY)
181 return 0;
182
183 r = sd_event_add_time(
184 UNIT(m)->manager->event,
185 &m->timer_event_source,
186 CLOCK_MONOTONIC,
187 usec, 0,
188 mount_dispatch_timer, m);
189 if (r < 0)
190 return r;
191
192 (void) sd_event_source_set_description(m->timer_event_source, "mount-timer");
193
194 return 0;
195 }
196
197 static void mount_unwatch_control_pid(Mount *m) {
198 assert(m);
199
200 if (m->control_pid <= 0)
201 return;
202
203 unit_unwatch_pid(UNIT(m), m->control_pid);
204 m->control_pid = 0;
205 }
206
207 static void mount_parameters_done(MountParameters *p) {
208 assert(p);
209
210 p->what = mfree(p->what);
211 p->options = mfree(p->options);
212 p->fstype = mfree(p->fstype);
213 }
214
215 static void mount_done(Unit *u) {
216 Mount *m = MOUNT(u);
217
218 assert(m);
219
220 m->where = mfree(m->where);
221
222 mount_parameters_done(&m->parameters_proc_self_mountinfo);
223 mount_parameters_done(&m->parameters_fragment);
224
225 m->exec_runtime = exec_runtime_unref(m->exec_runtime, false);
226 exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
227 m->control_command = NULL;
228
229 dynamic_creds_unref(&m->dynamic_creds);
230
231 mount_unwatch_control_pid(m);
232
233 m->timer_event_source = sd_event_source_unref(m->timer_event_source);
234 }
235
236 _pure_ static MountParameters* get_mount_parameters_fragment(Mount *m) {
237 assert(m);
238
239 if (m->from_fragment)
240 return &m->parameters_fragment;
241
242 return NULL;
243 }
244
245 _pure_ static MountParameters* get_mount_parameters(Mount *m) {
246 assert(m);
247
248 if (m->from_proc_self_mountinfo)
249 return &m->parameters_proc_self_mountinfo;
250
251 return get_mount_parameters_fragment(m);
252 }
253
254 static int mount_add_mount_dependencies(Mount *m) {
255 MountParameters *pm;
256 Unit *other;
257 Iterator i;
258 Set *s;
259 int r;
260
261 assert(m);
262
263 if (!path_equal(m->where, "/")) {
264 _cleanup_free_ char *parent = NULL;
265
266 /* Adds in links to other mount points that might lie further up in the hierarchy */
267
268 parent = dirname_malloc(m->where);
269 if (!parent)
270 return -ENOMEM;
271
272 r = unit_require_mounts_for(UNIT(m), parent, UNIT_DEPENDENCY_IMPLICIT);
273 if (r < 0)
274 return r;
275 }
276
277 /* Adds in dependencies to other mount points that might be needed for the source path (if this is a bind mount
278 * or a loop mount) to be available. */
279 pm = get_mount_parameters_fragment(m);
280 if (pm && pm->what &&
281 path_is_absolute(pm->what) &&
282 (mount_is_bind(pm) || mount_is_loop(pm) || !mount_is_network(pm))) {
283
284 r = unit_require_mounts_for(UNIT(m), pm->what, UNIT_DEPENDENCY_FILE);
285 if (r < 0)
286 return r;
287 }
288
289 /* Adds in dependencies to other units that use this path or paths further down in the hierarchy */
290 s = manager_get_units_requiring_mounts_for(UNIT(m)->manager, m->where);
291 SET_FOREACH(other, s, i) {
292
293 if (other->load_state != UNIT_LOADED)
294 continue;
295
296 if (other == UNIT(m))
297 continue;
298
299 r = unit_add_dependency(other, UNIT_AFTER, UNIT(m), true, UNIT_DEPENDENCY_PATH);
300 if (r < 0)
301 return r;
302
303 if (UNIT(m)->fragment_path) {
304 /* If we have fragment configuration, then make this dependency required */
305 r = unit_add_dependency(other, UNIT_REQUIRES, UNIT(m), true, UNIT_DEPENDENCY_PATH);
306 if (r < 0)
307 return r;
308 }
309 }
310
311 return 0;
312 }
313
314 static int mount_add_device_dependencies(Mount *m) {
315 bool device_wants_mount;
316 UnitDependencyMask mask;
317 MountParameters *p;
318 UnitDependency dep;
319 int r;
320
321 assert(m);
322
323 p = get_mount_parameters(m);
324 if (!p)
325 return 0;
326
327 if (!p->what)
328 return 0;
329
330 if (mount_is_bind(p))
331 return 0;
332
333 if (!is_device_path(p->what))
334 return 0;
335
336 /* /dev/root is a really weird thing, it's not a real device,
337 * but just a path the kernel exports for the root file system
338 * specified on the kernel command line. Ignore it here. */
339 if (path_equal(p->what, "/dev/root"))
340 return 0;
341
342 if (path_equal(m->where, "/"))
343 return 0;
344
345 device_wants_mount =
346 mount_is_auto(p) && !mount_is_automount(p) && MANAGER_IS_SYSTEM(UNIT(m)->manager);
347
348 /* Mount units from /proc/self/mountinfo are not bound to devices
349 * by default since they're subject to races when devices are
350 * unplugged. But the user can still force this dep with an
351 * appropriate option (or udev property) so the mount units are
352 * automatically stopped when the device disappears suddenly. */
353 dep = mount_is_bound_to_device(m) ? UNIT_BINDS_TO : UNIT_REQUIRES;
354
355 mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT;
356
357 r = unit_add_node_dependency(UNIT(m), p->what, device_wants_mount, dep, mask);
358 if (r < 0)
359 return r;
360
361 return 0;
362 }
363
364 static int mount_add_quota_dependencies(Mount *m) {
365 UnitDependencyMask mask;
366 MountParameters *p;
367 int r;
368
369 assert(m);
370
371 if (!MANAGER_IS_SYSTEM(UNIT(m)->manager))
372 return 0;
373
374 p = get_mount_parameters_fragment(m);
375 if (!p)
376 return 0;
377
378 if (!mount_needs_quota(p))
379 return 0;
380
381 mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT;
382
383 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, true, mask);
384 if (r < 0)
385 return r;
386
387 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, true, mask);
388 if (r < 0)
389 return r;
390
391 return 0;
392 }
393
394 static bool mount_is_extrinsic(Mount *m) {
395 MountParameters *p;
396 assert(m);
397
398 /* Returns true for all units that are "magic" and should be excluded from the usual start-up and shutdown
399 * dependencies. We call them "extrinsic" here, as they are generally mounted outside of the systemd dependency
400 * logic. We shouldn't attempt to manage them ourselves but it's fine if the user operates on them with us. */
401
402 if (!MANAGER_IS_SYSTEM(UNIT(m)->manager)) /* We only automatically manage mounts if we are in system mode */
403 return true;
404
405 if (PATH_IN_SET(m->where, /* Don't bother with the OS data itself */
406 "/",
407 "/usr"))
408 return true;
409
410 if (PATH_STARTSWITH_SET(m->where,
411 "/run/initramfs", /* This should stay around from before we boot until after we shutdown */
412 "/proc", /* All of this is API VFS */
413 "/sys", /* … dito … */
414 "/dev")) /* … dito … */
415 return true;
416
417 /* If this is an initrd mount, and we are not in the initrd, then leave this around forever, too. */
418 p = get_mount_parameters(m);
419 if (p && fstab_test_option(p->options, "x-initrd.mount\0") && !in_initrd())
420 return true;
421
422 return false;
423 }
424
425 static int mount_add_default_dependencies(Mount *m) {
426 const char *after, *before;
427 UnitDependencyMask mask;
428 MountParameters *p;
429 int r;
430
431 assert(m);
432
433 if (!UNIT(m)->default_dependencies)
434 return 0;
435
436 /* We do not add any default dependencies to /, /usr or /run/initramfs/, since they are guaranteed to stay
437 * mounted the whole time, since our system is on it. Also, don't bother with anything mounted below virtual
438 * file systems, it's also going to be virtual, and hence not worth the effort. */
439 if (mount_is_extrinsic(m))
440 return 0;
441
442 p = get_mount_parameters(m);
443 if (!p)
444 return 0;
445
446 mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_DEFAULT;
447
448 if (mount_is_network(p)) {
449 /* We order ourselves after network.target. This is
450 * primarily useful at shutdown: services that take
451 * down the network should order themselves before
452 * network.target, so that they are shut down only
453 * after this mount unit is stopped. */
454
455 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_NETWORK_TARGET, true, mask);
456 if (r < 0)
457 return r;
458
459 /* We pull in network-online.target, and order
460 * ourselves after it. This is useful at start-up to
461 * actively pull in tools that want to be started
462 * before we start mounting network file systems, and
463 * whose purpose it is to delay this until the network
464 * is "up". */
465
466 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_WANTS, UNIT_AFTER, SPECIAL_NETWORK_ONLINE_TARGET, true, mask);
467 if (r < 0)
468 return r;
469
470 after = SPECIAL_REMOTE_FS_PRE_TARGET;
471 before = SPECIAL_REMOTE_FS_TARGET;
472 } else {
473 after = SPECIAL_LOCAL_FS_PRE_TARGET;
474 before = SPECIAL_LOCAL_FS_TARGET;
475 }
476
477 r = unit_add_dependency_by_name(UNIT(m), UNIT_BEFORE, before, true, mask);
478 if (r < 0)
479 return r;
480
481 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, true, mask);
482 if (r < 0)
483 return r;
484
485 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, true, mask);
486 if (r < 0)
487 return r;
488
489 /* If this is a tmpfs mount then we have to unmount it before we try to deactivate swaps */
490 if (streq_ptr(p->fstype, "tmpfs")) {
491 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_SWAP_TARGET, true, mask);
492 if (r < 0)
493 return r;
494 }
495
496 return 0;
497 }
498
499 static int mount_verify(Mount *m) {
500 _cleanup_free_ char *e = NULL;
501 MountParameters *p;
502 int r;
503
504 assert(m);
505
506 if (UNIT(m)->load_state != UNIT_LOADED)
507 return 0;
508
509 if (!m->from_fragment && !m->from_proc_self_mountinfo && !UNIT(m)->perpetual)
510 return -ENOENT;
511
512 r = unit_name_from_path(m->where, ".mount", &e);
513 if (r < 0)
514 return log_unit_error_errno(UNIT(m), r, "Failed to generate unit name from mount path: %m");
515
516 if (!unit_has_name(UNIT(m), e)) {
517 log_unit_error(UNIT(m), "Where= setting doesn't match unit name. Refusing.");
518 return -ENOEXEC;
519 }
520
521 if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
522 log_unit_error(UNIT(m), "Cannot create mount unit for API file system %s. Refusing.", m->where);
523 return -ENOEXEC;
524 }
525
526 p = get_mount_parameters_fragment(m);
527 if (p && !p->what) {
528 log_unit_error(UNIT(m), "What= setting is missing. Refusing.");
529 return -ENOEXEC;
530 }
531
532 if (m->exec_context.pam_name && m->kill_context.kill_mode != KILL_CONTROL_GROUP) {
533 log_unit_error(UNIT(m), "Unit has PAM enabled. Kill mode must be set to control-group'. Refusing.");
534 return -ENOEXEC;
535 }
536
537 return 0;
538 }
539
540 static int mount_add_extras(Mount *m) {
541 Unit *u = UNIT(m);
542 int r;
543
544 assert(m);
545
546 /* Note: this call might be called after we already have been loaded once (and even when it has already been
547 * activated), in case data from /proc/self/mountinfo has changed. This means all code here needs to be ready
548 * to run with an already set up unit. */
549
550 if (u->fragment_path)
551 m->from_fragment = true;
552
553 if (!m->where) {
554 r = unit_name_to_path(u->id, &m->where);
555 if (r < 0)
556 return r;
557 }
558
559 path_simplify(m->where, false);
560
561 if (!u->description) {
562 r = unit_set_description(u, m->where);
563 if (r < 0)
564 return r;
565 }
566
567 r = mount_add_device_dependencies(m);
568 if (r < 0)
569 return r;
570
571 r = mount_add_mount_dependencies(m);
572 if (r < 0)
573 return r;
574
575 r = mount_add_quota_dependencies(m);
576 if (r < 0)
577 return r;
578
579 r = unit_patch_contexts(u);
580 if (r < 0)
581 return r;
582
583 r = unit_add_exec_dependencies(u, &m->exec_context);
584 if (r < 0)
585 return r;
586
587 r = unit_set_default_slice(u);
588 if (r < 0)
589 return r;
590
591 r = mount_add_default_dependencies(m);
592 if (r < 0)
593 return r;
594
595 return 0;
596 }
597
598 static int mount_load_root_mount(Unit *u) {
599 assert(u);
600
601 if (!unit_has_name(u, SPECIAL_ROOT_MOUNT))
602 return 0;
603
604 u->perpetual = true;
605 u->default_dependencies = false;
606
607 /* The stdio/kmsg bridge socket is on /, in order to avoid a dep loop, don't use kmsg logging for -.mount */
608 MOUNT(u)->exec_context.std_output = EXEC_OUTPUT_NULL;
609 MOUNT(u)->exec_context.std_input = EXEC_INPUT_NULL;
610
611 if (!u->description)
612 u->description = strdup("Root Mount");
613
614 return 1;
615 }
616
617 static int mount_load(Unit *u) {
618 Mount *m = MOUNT(u);
619 int r;
620
621 assert(u);
622 assert(u->load_state == UNIT_STUB);
623
624 r = mount_load_root_mount(u);
625 if (r < 0)
626 return r;
627
628 if (m->from_proc_self_mountinfo || u->perpetual)
629 r = unit_load_fragment_and_dropin_optional(u);
630 else
631 r = unit_load_fragment_and_dropin(u);
632 if (r < 0)
633 return r;
634
635 /* This is a new unit? Then let's add in some extras */
636 if (u->load_state == UNIT_LOADED) {
637 r = mount_add_extras(m);
638 if (r < 0)
639 return r;
640 }
641
642 return mount_verify(m);
643 }
644
645 static void mount_set_state(Mount *m, MountState state) {
646 MountState old_state;
647 assert(m);
648
649 if (m->state != state)
650 bus_unit_send_pending_change_signal(UNIT(m), false);
651
652 old_state = m->state;
653 m->state = state;
654
655 if (!MOUNT_STATE_WITH_PROCESS(state)) {
656 m->timer_event_source = sd_event_source_unref(m->timer_event_source);
657 mount_unwatch_control_pid(m);
658 m->control_command = NULL;
659 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
660 }
661
662 if (state != old_state)
663 log_unit_debug(UNIT(m), "Changed %s -> %s", mount_state_to_string(old_state), mount_state_to_string(state));
664
665 unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state],
666 m->reload_result == MOUNT_SUCCESS ? 0 : UNIT_NOTIFY_RELOAD_FAILURE);
667 }
668
669 static int mount_coldplug(Unit *u) {
670 Mount *m = MOUNT(u);
671 MountState new_state = MOUNT_DEAD;
672 int r;
673
674 assert(m);
675 assert(m->state == MOUNT_DEAD);
676
677 if (m->deserialized_state != m->state)
678 new_state = m->deserialized_state;
679 else if (m->from_proc_self_mountinfo)
680 new_state = MOUNT_MOUNTED;
681
682 if (new_state == m->state)
683 return 0;
684
685 if (m->control_pid > 0 &&
686 pid_is_unwaited(m->control_pid) &&
687 MOUNT_STATE_WITH_PROCESS(new_state)) {
688
689 r = unit_watch_pid(UNIT(m), m->control_pid);
690 if (r < 0)
691 return r;
692
693 r = mount_arm_timer(m, usec_add(u->state_change_timestamp.monotonic, m->timeout_usec));
694 if (r < 0)
695 return r;
696 }
697
698 if (!IN_SET(new_state, MOUNT_DEAD, MOUNT_FAILED)) {
699 (void) unit_setup_dynamic_creds(u);
700 (void) unit_setup_exec_runtime(u);
701 }
702
703 mount_set_state(m, new_state);
704 return 0;
705 }
706
707 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
708 char buf[FORMAT_TIMESPAN_MAX];
709 Mount *m = MOUNT(u);
710 MountParameters *p;
711
712 assert(m);
713 assert(f);
714
715 p = get_mount_parameters(m);
716
717 fprintf(f,
718 "%sMount State: %s\n"
719 "%sResult: %s\n"
720 "%sWhere: %s\n"
721 "%sWhat: %s\n"
722 "%sFile System Type: %s\n"
723 "%sOptions: %s\n"
724 "%sFrom /proc/self/mountinfo: %s\n"
725 "%sFrom fragment: %s\n"
726 "%sExtrinsic: %s\n"
727 "%sDirectoryMode: %04o\n"
728 "%sSloppyOptions: %s\n"
729 "%sLazyUnmount: %s\n"
730 "%sForceUnmount: %s\n"
731 "%sTimoutSec: %s\n",
732 prefix, mount_state_to_string(m->state),
733 prefix, mount_result_to_string(m->result),
734 prefix, m->where,
735 prefix, p ? strna(p->what) : "n/a",
736 prefix, p ? strna(p->fstype) : "n/a",
737 prefix, p ? strna(p->options) : "n/a",
738 prefix, yes_no(m->from_proc_self_mountinfo),
739 prefix, yes_no(m->from_fragment),
740 prefix, yes_no(mount_is_extrinsic(m)),
741 prefix, m->directory_mode,
742 prefix, yes_no(m->sloppy_options),
743 prefix, yes_no(m->lazy_unmount),
744 prefix, yes_no(m->force_unmount),
745 prefix, format_timespan(buf, sizeof(buf), m->timeout_usec, USEC_PER_SEC));
746
747 if (m->control_pid > 0)
748 fprintf(f,
749 "%sControl PID: "PID_FMT"\n",
750 prefix, m->control_pid);
751
752 exec_context_dump(&m->exec_context, f, prefix);
753 kill_context_dump(&m->kill_context, f, prefix);
754 cgroup_context_dump(&m->cgroup_context, f, prefix);
755 }
756
757 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
758
759 _cleanup_(exec_params_clear) ExecParameters exec_params = {
760 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
761 .stdin_fd = -1,
762 .stdout_fd = -1,
763 .stderr_fd = -1,
764 .exec_fd = -1,
765 };
766 pid_t pid;
767 int r;
768
769 assert(m);
770 assert(c);
771 assert(_pid);
772
773 r = unit_prepare_exec(UNIT(m));
774 if (r < 0)
775 return r;
776
777 r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
778 if (r < 0)
779 return r;
780
781 r = unit_set_exec_params(UNIT(m), &exec_params);
782 if (r < 0)
783 return r;
784
785 r = exec_spawn(UNIT(m),
786 c,
787 &m->exec_context,
788 &exec_params,
789 m->exec_runtime,
790 &m->dynamic_creds,
791 &pid);
792 if (r < 0)
793 return r;
794
795 r = unit_watch_pid(UNIT(m), pid);
796 if (r < 0)
797 /* FIXME: we need to do something here */
798 return r;
799
800 *_pid = pid;
801
802 return 0;
803 }
804
805 static void mount_enter_dead(Mount *m, MountResult f) {
806 assert(m);
807
808 if (m->result == MOUNT_SUCCESS)
809 m->result = f;
810
811 unit_log_result(UNIT(m), m->result == MOUNT_SUCCESS, mount_result_to_string(m->result));
812 mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD);
813
814 m->exec_runtime = exec_runtime_unref(m->exec_runtime, true);
815
816 exec_context_destroy_runtime_directory(&m->exec_context, UNIT(m)->manager->prefix[EXEC_DIRECTORY_RUNTIME]);
817
818 unit_unref_uid_gid(UNIT(m), true);
819
820 dynamic_creds_destroy(&m->dynamic_creds);
821 }
822
823 static void mount_enter_mounted(Mount *m, MountResult f) {
824 assert(m);
825
826 if (m->result == MOUNT_SUCCESS)
827 m->result = f;
828
829 mount_set_state(m, MOUNT_MOUNTED);
830 }
831
832 static void mount_enter_dead_or_mounted(Mount *m, MountResult f) {
833 assert(m);
834
835 /* Enter DEAD or MOUNTED state, depending on what the kernel currently says about the mount point. We use this
836 * whenever we executed an operation, so that our internal state reflects what the kernel says again, after all
837 * ultimately we just mirror the kernel's internal state on this. */
838
839 if (m->from_proc_self_mountinfo)
840 mount_enter_mounted(m, f);
841 else
842 mount_enter_dead(m, f);
843 }
844
845 static int state_to_kill_operation(MountState state) {
846 switch (state) {
847
848 case MOUNT_REMOUNTING_SIGTERM:
849 case MOUNT_UNMOUNTING_SIGTERM:
850 return KILL_TERMINATE;
851
852 case MOUNT_REMOUNTING_SIGKILL:
853 case MOUNT_UNMOUNTING_SIGKILL:
854 return KILL_KILL;
855
856 default:
857 return _KILL_OPERATION_INVALID;
858 }
859 }
860
861 static void mount_enter_signal(Mount *m, MountState state, MountResult f) {
862 int r;
863
864 assert(m);
865
866 if (m->result == MOUNT_SUCCESS)
867 m->result = f;
868
869 r = unit_kill_context(
870 UNIT(m),
871 &m->kill_context,
872 state_to_kill_operation(state),
873 -1,
874 m->control_pid,
875 false);
876 if (r < 0)
877 goto fail;
878
879 if (r > 0) {
880 r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
881 if (r < 0)
882 goto fail;
883
884 mount_set_state(m, state);
885 } else if (state == MOUNT_REMOUNTING_SIGTERM && m->kill_context.send_sigkill)
886 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
887 else if (IN_SET(state, MOUNT_REMOUNTING_SIGTERM, MOUNT_REMOUNTING_SIGKILL))
888 mount_enter_mounted(m, MOUNT_SUCCESS);
889 else if (state == MOUNT_UNMOUNTING_SIGTERM && m->kill_context.send_sigkill)
890 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS);
891 else
892 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
893
894 return;
895
896 fail:
897 log_unit_warning_errno(UNIT(m), r, "Failed to kill processes: %m");
898 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
899 }
900
901 static void mount_enter_unmounting(Mount *m) {
902 int r;
903
904 assert(m);
905
906 /* Start counting our attempts */
907 if (!IN_SET(m->state,
908 MOUNT_UNMOUNTING,
909 MOUNT_UNMOUNTING_SIGTERM,
910 MOUNT_UNMOUNTING_SIGKILL))
911 m->n_retry_umount = 0;
912
913 m->control_command_id = MOUNT_EXEC_UNMOUNT;
914 m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
915
916 r = exec_command_set(m->control_command, UMOUNT_PATH, m->where, "-c", NULL);
917 if (r >= 0 && m->lazy_unmount)
918 r = exec_command_append(m->control_command, "-l", NULL);
919 if (r >= 0 && m->force_unmount)
920 r = exec_command_append(m->control_command, "-f", NULL);
921 if (r < 0)
922 goto fail;
923
924 mount_unwatch_control_pid(m);
925
926 r = mount_spawn(m, m->control_command, &m->control_pid);
927 if (r < 0)
928 goto fail;
929
930 mount_set_state(m, MOUNT_UNMOUNTING);
931
932 return;
933
934 fail:
935 log_unit_warning_errno(UNIT(m), r, "Failed to run 'umount' task: %m");
936 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
937 }
938
939 static void mount_enter_mounting(Mount *m) {
940 int r;
941 MountParameters *p;
942
943 assert(m);
944
945 r = unit_fail_if_noncanonical(UNIT(m), m->where);
946 if (r < 0)
947 goto fail;
948
949 (void) mkdir_p_label(m->where, m->directory_mode);
950
951 unit_warn_if_dir_nonempty(UNIT(m), m->where);
952
953 unit_warn_leftover_processes(UNIT(m));
954
955 m->control_command_id = MOUNT_EXEC_MOUNT;
956 m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
957
958 /* Create the source directory for bind-mounts if needed */
959 p = get_mount_parameters_fragment(m);
960 if (p && mount_is_bind(p))
961 (void) mkdir_p_label(p->what, m->directory_mode);
962
963 if (p) {
964 _cleanup_free_ char *opts = NULL;
965
966 r = fstab_filter_options(p->options, "nofail\0" "noauto\0" "auto\0", NULL, NULL, &opts);
967 if (r < 0)
968 goto fail;
969
970 r = exec_command_set(m->control_command, MOUNT_PATH, p->what, m->where, NULL);
971 if (r >= 0 && m->sloppy_options)
972 r = exec_command_append(m->control_command, "-s", NULL);
973 if (r >= 0 && p->fstype)
974 r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
975 if (r >= 0 && !isempty(opts))
976 r = exec_command_append(m->control_command, "-o", opts, NULL);
977 } else
978 r = -ENOENT;
979 if (r < 0)
980 goto fail;
981
982 mount_unwatch_control_pid(m);
983
984 r = mount_spawn(m, m->control_command, &m->control_pid);
985 if (r < 0)
986 goto fail;
987
988 mount_set_state(m, MOUNT_MOUNTING);
989
990 return;
991
992 fail:
993 log_unit_warning_errno(UNIT(m), r, "Failed to run 'mount' task: %m");
994 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
995 }
996
997 static void mount_set_reload_result(Mount *m, MountResult result) {
998 assert(m);
999
1000 /* Only store the first error we encounter */
1001 if (m->reload_result != MOUNT_SUCCESS)
1002 return;
1003
1004 m->reload_result = result;
1005 }
1006
1007 static void mount_enter_remounting(Mount *m) {
1008 int r;
1009 MountParameters *p;
1010
1011 assert(m);
1012
1013 /* Reset reload result when we are about to start a new remount operation */
1014 m->reload_result = MOUNT_SUCCESS;
1015
1016 m->control_command_id = MOUNT_EXEC_REMOUNT;
1017 m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
1018
1019 p = get_mount_parameters_fragment(m);
1020 if (p) {
1021 const char *o;
1022
1023 if (p->options)
1024 o = strjoina("remount,", p->options);
1025 else
1026 o = "remount";
1027
1028 r = exec_command_set(m->control_command, MOUNT_PATH,
1029 p->what, m->where,
1030 "-o", o, NULL);
1031 if (r >= 0 && m->sloppy_options)
1032 r = exec_command_append(m->control_command, "-s", NULL);
1033 if (r >= 0 && p->fstype)
1034 r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
1035 } else
1036 r = -ENOENT;
1037 if (r < 0)
1038 goto fail;
1039
1040 mount_unwatch_control_pid(m);
1041
1042 r = mount_spawn(m, m->control_command, &m->control_pid);
1043 if (r < 0)
1044 goto fail;
1045
1046 mount_set_state(m, MOUNT_REMOUNTING);
1047
1048 return;
1049
1050 fail:
1051 log_unit_warning_errno(UNIT(m), r, "Failed to run 'remount' task: %m");
1052 mount_set_reload_result(m, MOUNT_FAILURE_RESOURCES);
1053 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1054 }
1055
1056 static int mount_start(Unit *u) {
1057 Mount *m = MOUNT(u);
1058 int r;
1059
1060 assert(m);
1061
1062 /* We cannot fulfill this request right now, try again later
1063 * please! */
1064 if (IN_SET(m->state,
1065 MOUNT_UNMOUNTING,
1066 MOUNT_UNMOUNTING_SIGTERM,
1067 MOUNT_UNMOUNTING_SIGKILL))
1068 return -EAGAIN;
1069
1070 /* Already on it! */
1071 if (m->state == MOUNT_MOUNTING)
1072 return 0;
1073
1074 assert(IN_SET(m->state, MOUNT_DEAD, MOUNT_FAILED));
1075
1076 r = unit_start_limit_test(u);
1077 if (r < 0) {
1078 mount_enter_dead(m, MOUNT_FAILURE_START_LIMIT_HIT);
1079 return r;
1080 }
1081
1082 r = unit_acquire_invocation_id(u);
1083 if (r < 0)
1084 return r;
1085
1086 m->result = MOUNT_SUCCESS;
1087 m->reload_result = MOUNT_SUCCESS;
1088 exec_command_reset_status_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
1089
1090 u->reset_accounting = true;
1091
1092 mount_enter_mounting(m);
1093 return 1;
1094 }
1095
1096 static int mount_stop(Unit *u) {
1097 Mount *m = MOUNT(u);
1098
1099 assert(m);
1100
1101 switch (m->state) {
1102
1103 case MOUNT_UNMOUNTING:
1104 case MOUNT_UNMOUNTING_SIGKILL:
1105 case MOUNT_UNMOUNTING_SIGTERM:
1106 /* Already on it */
1107 return 0;
1108
1109 case MOUNT_MOUNTING:
1110 case MOUNT_MOUNTING_DONE:
1111 case MOUNT_REMOUNTING:
1112 /* If we are still waiting for /bin/mount, we go directly into kill mode. */
1113 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_SUCCESS);
1114 return 0;
1115
1116 case MOUNT_REMOUNTING_SIGTERM:
1117 /* If we are already waiting for a hung remount, convert this to the matching unmounting state */
1118 mount_set_state(m, MOUNT_UNMOUNTING_SIGTERM);
1119 return 0;
1120
1121 case MOUNT_REMOUNTING_SIGKILL:
1122 /* as above */
1123 mount_set_state(m, MOUNT_UNMOUNTING_SIGKILL);
1124 return 0;
1125
1126 case MOUNT_MOUNTED:
1127 mount_enter_unmounting(m);
1128 return 1;
1129
1130 default:
1131 assert_not_reached("Unexpected state.");
1132 }
1133 }
1134
1135 static int mount_reload(Unit *u) {
1136 Mount *m = MOUNT(u);
1137
1138 assert(m);
1139 assert(m->state == MOUNT_MOUNTED);
1140
1141 mount_enter_remounting(m);
1142
1143 return 1;
1144 }
1145
1146 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
1147 Mount *m = MOUNT(u);
1148
1149 assert(m);
1150 assert(f);
1151 assert(fds);
1152
1153 (void) serialize_item(f, "state", mount_state_to_string(m->state));
1154 (void) serialize_item(f, "result", mount_result_to_string(m->result));
1155 (void) serialize_item(f, "reload-result", mount_result_to_string(m->reload_result));
1156
1157 if (m->control_pid > 0)
1158 (void) serialize_item_format(f, "control-pid", PID_FMT, m->control_pid);
1159
1160 if (m->control_command_id >= 0)
1161 (void) serialize_item(f, "control-command", mount_exec_command_to_string(m->control_command_id));
1162
1163 return 0;
1164 }
1165
1166 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1167 Mount *m = MOUNT(u);
1168
1169 assert(u);
1170 assert(key);
1171 assert(value);
1172 assert(fds);
1173
1174 if (streq(key, "state")) {
1175 MountState state;
1176
1177 if ((state = mount_state_from_string(value)) < 0)
1178 log_unit_debug(u, "Failed to parse state value: %s", value);
1179 else
1180 m->deserialized_state = state;
1181 } else if (streq(key, "result")) {
1182 MountResult f;
1183
1184 f = mount_result_from_string(value);
1185 if (f < 0)
1186 log_unit_debug(u, "Failed to parse result value: %s", value);
1187 else if (f != MOUNT_SUCCESS)
1188 m->result = f;
1189
1190 } else if (streq(key, "reload-result")) {
1191 MountResult f;
1192
1193 f = mount_result_from_string(value);
1194 if (f < 0)
1195 log_unit_debug(u, "Failed to parse reload result value: %s", value);
1196 else if (f != MOUNT_SUCCESS)
1197 m->reload_result = f;
1198
1199 } else if (streq(key, "control-pid")) {
1200 pid_t pid;
1201
1202 if (parse_pid(value, &pid) < 0)
1203 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
1204 else
1205 m->control_pid = pid;
1206 } else if (streq(key, "control-command")) {
1207 MountExecCommand id;
1208
1209 id = mount_exec_command_from_string(value);
1210 if (id < 0)
1211 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
1212 else {
1213 m->control_command_id = id;
1214 m->control_command = m->exec_command + id;
1215 }
1216 } else
1217 log_unit_debug(u, "Unknown serialization key: %s", key);
1218
1219 return 0;
1220 }
1221
1222 _pure_ static UnitActiveState mount_active_state(Unit *u) {
1223 assert(u);
1224
1225 return state_translation_table[MOUNT(u)->state];
1226 }
1227
1228 _pure_ static const char *mount_sub_state_to_string(Unit *u) {
1229 assert(u);
1230
1231 return mount_state_to_string(MOUNT(u)->state);
1232 }
1233
1234 _pure_ static bool mount_may_gc(Unit *u) {
1235 Mount *m = MOUNT(u);
1236
1237 assert(m);
1238
1239 if (m->from_proc_self_mountinfo)
1240 return false;
1241
1242 return true;
1243 }
1244
1245 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1246 Mount *m = MOUNT(u);
1247 MountResult f;
1248
1249 assert(m);
1250 assert(pid >= 0);
1251
1252 if (pid != m->control_pid)
1253 return;
1254
1255 m->control_pid = 0;
1256
1257 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
1258 f = MOUNT_SUCCESS;
1259 else if (code == CLD_EXITED)
1260 f = MOUNT_FAILURE_EXIT_CODE;
1261 else if (code == CLD_KILLED)
1262 f = MOUNT_FAILURE_SIGNAL;
1263 else if (code == CLD_DUMPED)
1264 f = MOUNT_FAILURE_CORE_DUMP;
1265 else
1266 assert_not_reached("Unknown code");
1267
1268 if (IN_SET(m->state, MOUNT_REMOUNTING, MOUNT_REMOUNTING_SIGKILL, MOUNT_REMOUNTING_SIGTERM))
1269 mount_set_reload_result(m, f);
1270 else if (m->result == MOUNT_SUCCESS)
1271 m->result = f;
1272
1273 if (m->control_command) {
1274 exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status);
1275
1276 m->control_command = NULL;
1277 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1278 }
1279
1280 unit_log_process_exit(
1281 u, f == MOUNT_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
1282 "Mount process",
1283 mount_exec_command_to_string(m->control_command_id),
1284 code, status);
1285
1286 /* Note that due to the io event priority logic, we can be sure the new mountinfo is loaded
1287 * before we process the SIGCHLD for the mount command. */
1288
1289 switch (m->state) {
1290
1291 case MOUNT_MOUNTING:
1292 /* Our mount point has not appeared in mountinfo. Something went wrong. */
1293
1294 if (f == MOUNT_SUCCESS) {
1295 /* Either /bin/mount has an unexpected definition of success,
1296 * or someone raced us and we lost. */
1297 log_unit_warning(UNIT(m), "Mount process finished, but there is no mount.");
1298 f = MOUNT_FAILURE_PROTOCOL;
1299 }
1300 mount_enter_dead(m, f);
1301 break;
1302
1303 case MOUNT_MOUNTING_DONE:
1304 mount_enter_mounted(m, f);
1305 break;
1306
1307 case MOUNT_REMOUNTING:
1308 case MOUNT_REMOUNTING_SIGTERM:
1309 case MOUNT_REMOUNTING_SIGKILL:
1310 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1311 break;
1312
1313 case MOUNT_UNMOUNTING:
1314
1315 if (f == MOUNT_SUCCESS && m->from_proc_self_mountinfo) {
1316
1317 /* Still a mount point? If so, let's try again. Most likely there were multiple mount points
1318 * stacked on top of each other. We might exceed the timeout specified by the user overall,
1319 * but we will stop as soon as any one umount times out. */
1320
1321 if (m->n_retry_umount < RETRY_UMOUNT_MAX) {
1322 log_unit_debug(u, "Mount still present, trying again.");
1323 m->n_retry_umount++;
1324 mount_enter_unmounting(m);
1325 } else {
1326 log_unit_warning(u, "Mount still present after %u attempts to unmount, giving up.", m->n_retry_umount);
1327 mount_enter_mounted(m, f);
1328 }
1329 } else
1330 mount_enter_dead_or_mounted(m, f);
1331
1332 break;
1333
1334 case MOUNT_UNMOUNTING_SIGKILL:
1335 case MOUNT_UNMOUNTING_SIGTERM:
1336 mount_enter_dead_or_mounted(m, f);
1337 break;
1338
1339 default:
1340 assert_not_reached("Uh, control process died at wrong time.");
1341 }
1342
1343 /* Notify clients about changed exit status */
1344 unit_add_to_dbus_queue(u);
1345 }
1346
1347 static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
1348 Mount *m = MOUNT(userdata);
1349
1350 assert(m);
1351 assert(m->timer_event_source == source);
1352
1353 switch (m->state) {
1354
1355 case MOUNT_MOUNTING:
1356 case MOUNT_MOUNTING_DONE:
1357 log_unit_warning(UNIT(m), "Mounting timed out. Terminating.");
1358 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1359 break;
1360
1361 case MOUNT_REMOUNTING:
1362 log_unit_warning(UNIT(m), "Remounting timed out. Terminating remount process.");
1363 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1364 mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, MOUNT_SUCCESS);
1365 break;
1366
1367 case MOUNT_REMOUNTING_SIGTERM:
1368 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1369
1370 if (m->kill_context.send_sigkill) {
1371 log_unit_warning(UNIT(m), "Remounting timed out. Killing.");
1372 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
1373 } else {
1374 log_unit_warning(UNIT(m), "Remounting timed out. Skipping SIGKILL. Ignoring.");
1375 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1376 }
1377 break;
1378
1379 case MOUNT_REMOUNTING_SIGKILL:
1380 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1381
1382 log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
1383 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1384 break;
1385
1386 case MOUNT_UNMOUNTING:
1387 log_unit_warning(UNIT(m), "Unmounting timed out. Terminating.");
1388 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1389 break;
1390
1391 case MOUNT_UNMOUNTING_SIGTERM:
1392 if (m->kill_context.send_sigkill) {
1393 log_unit_warning(UNIT(m), "Mount process timed out. Killing.");
1394 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
1395 } else {
1396 log_unit_warning(UNIT(m), "Mount process timed out. Skipping SIGKILL. Ignoring.");
1397 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
1398 }
1399 break;
1400
1401 case MOUNT_UNMOUNTING_SIGKILL:
1402 log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
1403 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
1404 break;
1405
1406 default:
1407 assert_not_reached("Timeout at wrong time.");
1408 }
1409
1410 return 0;
1411 }
1412
1413 typedef struct {
1414 bool is_mounted;
1415 bool just_mounted;
1416 bool just_changed;
1417 } MountSetupFlags;
1418
1419 static int mount_setup_new_unit(
1420 Unit *u,
1421 const char *what,
1422 const char *where,
1423 const char *options,
1424 const char *fstype,
1425 MountSetupFlags *flags) {
1426
1427 MountParameters *p;
1428
1429 assert(u);
1430 assert(flags);
1431
1432 u->source_path = strdup("/proc/self/mountinfo");
1433 MOUNT(u)->where = strdup(where);
1434 if (!u->source_path || !MOUNT(u)->where)
1435 return -ENOMEM;
1436
1437 /* Make sure to initialize those fields before mount_is_extrinsic(). */
1438 MOUNT(u)->from_proc_self_mountinfo = true;
1439 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1440
1441 p->what = strdup(what);
1442 p->options = strdup(options);
1443 p->fstype = strdup(fstype);
1444 if (!p->what || !p->options || !p->fstype)
1445 return -ENOMEM;
1446
1447 if (!mount_is_extrinsic(MOUNT(u))) {
1448 const char *target;
1449 int r;
1450
1451 target = mount_is_network(p) ? SPECIAL_REMOTE_FS_TARGET : SPECIAL_LOCAL_FS_TARGET;
1452 r = unit_add_dependency_by_name(u, UNIT_BEFORE, target, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
1453 if (r < 0)
1454 return r;
1455
1456 r = unit_add_dependency_by_name(u, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
1457 if (r < 0)
1458 return r;
1459 }
1460
1461 unit_add_to_load_queue(u);
1462 flags->is_mounted = true;
1463 flags->just_mounted = true;
1464 flags->just_changed = true;
1465
1466 return 0;
1467 }
1468
1469 static int mount_setup_existing_unit(
1470 Unit *u,
1471 const char *what,
1472 const char *where,
1473 const char *options,
1474 const char *fstype,
1475 MountSetupFlags *flags) {
1476
1477 MountParameters *p;
1478 bool load_extras = false;
1479 int r1, r2, r3;
1480
1481 assert(u);
1482 assert(flags);
1483
1484 if (!MOUNT(u)->where) {
1485 MOUNT(u)->where = strdup(where);
1486 if (!MOUNT(u)->where)
1487 return -ENOMEM;
1488 }
1489
1490 /* Make sure to initialize those fields before mount_is_extrinsic(). */
1491 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1492
1493 r1 = free_and_strdup(&p->what, what);
1494 r2 = free_and_strdup(&p->options, options);
1495 r3 = free_and_strdup(&p->fstype, fstype);
1496 if (r1 < 0 || r2 < 0 || r3 < 0)
1497 return -ENOMEM;
1498
1499 flags->just_changed = r1 > 0 || r2 > 0 || r3 > 0;
1500 flags->is_mounted = true;
1501 flags->just_mounted = !MOUNT(u)->from_proc_self_mountinfo || MOUNT(u)->just_mounted;
1502
1503 MOUNT(u)->from_proc_self_mountinfo = true;
1504
1505 if (!mount_is_extrinsic(MOUNT(u)) && mount_is_network(p)) {
1506 /* _netdev option may have shown up late, or on a
1507 * remount. Add remote-fs dependencies, even though
1508 * local-fs ones may already be there.
1509 *
1510 * Note: due to a current limitation (we don't track
1511 * in the dependency "Set*" objects who created a
1512 * dependency), we can only add deps, never lose them,
1513 * until the next full daemon-reload. */
1514 unit_add_dependency_by_name(u, UNIT_BEFORE, SPECIAL_REMOTE_FS_TARGET, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
1515 load_extras = true;
1516 }
1517
1518 if (u->load_state == UNIT_NOT_FOUND) {
1519 u->load_state = UNIT_LOADED;
1520 u->load_error = 0;
1521
1522 /* Load in the extras later on, after we
1523 * finished initialization of the unit */
1524
1525 /* FIXME: since we're going to load the unit later on, why setting load_extras=true ? */
1526 load_extras = true;
1527 flags->just_changed = true;
1528 }
1529
1530 if (load_extras)
1531 return mount_add_extras(MOUNT(u));
1532
1533 return 0;
1534 }
1535
1536 static int mount_setup_unit(
1537 Manager *m,
1538 const char *what,
1539 const char *where,
1540 const char *options,
1541 const char *fstype,
1542 bool set_flags) {
1543
1544 _cleanup_free_ char *e = NULL;
1545 MountSetupFlags flags;
1546 Unit *u;
1547 int r;
1548
1549 assert(m);
1550 assert(what);
1551 assert(where);
1552 assert(options);
1553 assert(fstype);
1554
1555 /* Ignore API mount points. They should never be referenced in
1556 * dependencies ever. */
1557 if (mount_point_is_api(where) || mount_point_ignore(where))
1558 return 0;
1559
1560 if (streq(fstype, "autofs"))
1561 return 0;
1562
1563 /* probably some kind of swap, ignore */
1564 if (!is_path(where))
1565 return 0;
1566
1567 r = unit_name_from_path(where, ".mount", &e);
1568 if (r < 0)
1569 return r;
1570
1571 u = manager_get_unit(m, e);
1572 if (!u) {
1573 /* First time we see this mount point meaning that it's
1574 * not been initiated by a mount unit but rather by the
1575 * sysadmin having called mount(8) directly. */
1576 r = unit_new_for_name(m, sizeof(Mount), e, &u);
1577 if (r < 0)
1578 goto fail;
1579
1580 r = mount_setup_new_unit(u, what, where, options, fstype, &flags);
1581 if (r < 0)
1582 unit_free(u);
1583 } else
1584 r = mount_setup_existing_unit(u, what, where, options, fstype, &flags);
1585
1586 if (r < 0)
1587 goto fail;
1588
1589 if (set_flags) {
1590 MOUNT(u)->is_mounted = flags.is_mounted;
1591 MOUNT(u)->just_mounted = flags.just_mounted;
1592 MOUNT(u)->just_changed = flags.just_changed;
1593 }
1594
1595 if (flags.just_changed)
1596 unit_add_to_dbus_queue(u);
1597
1598 return 0;
1599 fail:
1600 return log_warning_errno(r, "Failed to set up mount unit: %m");
1601 }
1602
1603 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1604 _cleanup_(mnt_free_tablep) struct libmnt_table *t = NULL;
1605 _cleanup_(mnt_free_iterp) struct libmnt_iter *i = NULL;
1606 int r = 0;
1607
1608 assert(m);
1609
1610 t = mnt_new_table();
1611 i = mnt_new_iter(MNT_ITER_FORWARD);
1612 if (!t || !i)
1613 return log_oom();
1614
1615 r = mnt_table_parse_mtab(t, NULL);
1616 if (r < 0)
1617 return log_error_errno(r, "Failed to parse /proc/self/mountinfo: %m");
1618
1619 r = 0;
1620 for (;;) {
1621 struct libmnt_fs *fs;
1622 const char *device, *path, *options, *fstype;
1623 _cleanup_free_ char *d = NULL, *p = NULL;
1624 int k;
1625
1626 k = mnt_table_next_fs(t, i, &fs);
1627 if (k == 1)
1628 break;
1629 if (k < 0)
1630 return log_error_errno(k, "Failed to get next entry from /proc/self/mountinfo: %m");
1631
1632 device = mnt_fs_get_source(fs);
1633 path = mnt_fs_get_target(fs);
1634 options = mnt_fs_get_options(fs);
1635 fstype = mnt_fs_get_fstype(fs);
1636
1637 if (!device || !path)
1638 continue;
1639
1640 if (cunescape(device, UNESCAPE_RELAX, &d) < 0)
1641 return log_oom();
1642
1643 if (cunescape(path, UNESCAPE_RELAX, &p) < 0)
1644 return log_oom();
1645
1646 device_found_node(m, d, DEVICE_FOUND_MOUNT, DEVICE_FOUND_MOUNT);
1647
1648 k = mount_setup_unit(m, d, p, options, fstype, set_flags);
1649 if (r == 0 && k < 0)
1650 r = k;
1651 }
1652
1653 return r;
1654 }
1655
1656 static void mount_shutdown(Manager *m) {
1657 assert(m);
1658
1659 m->mount_event_source = sd_event_source_unref(m->mount_event_source);
1660
1661 mnt_unref_monitor(m->mount_monitor);
1662 m->mount_monitor = NULL;
1663 }
1664
1665 static int mount_get_timeout(Unit *u, usec_t *timeout) {
1666 Mount *m = MOUNT(u);
1667 usec_t t;
1668 int r;
1669
1670 if (!m->timer_event_source)
1671 return 0;
1672
1673 r = sd_event_source_get_time(m->timer_event_source, &t);
1674 if (r < 0)
1675 return r;
1676 if (t == USEC_INFINITY)
1677 return 0;
1678
1679 *timeout = t;
1680 return 1;
1681 }
1682
1683 static void mount_enumerate_perpetual(Manager *m) {
1684 Unit *u;
1685 int r;
1686
1687 assert(m);
1688
1689 /* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's
1690 * unconditionally synthesize it here and mark it as perpetual. */
1691
1692 u = manager_get_unit(m, SPECIAL_ROOT_MOUNT);
1693 if (!u) {
1694 r = unit_new_for_name(m, sizeof(Mount), SPECIAL_ROOT_MOUNT, &u);
1695 if (r < 0) {
1696 log_error_errno(r, "Failed to allocate the special " SPECIAL_ROOT_MOUNT " unit: %m");
1697 return;
1698 }
1699 }
1700
1701 u->perpetual = true;
1702 MOUNT(u)->deserialized_state = MOUNT_MOUNTED;
1703
1704 unit_add_to_load_queue(u);
1705 unit_add_to_dbus_queue(u);
1706 }
1707
1708 static bool mount_is_mounted(Mount *m) {
1709 assert(m);
1710
1711 return UNIT(m)->perpetual || m->is_mounted;
1712 }
1713
1714 static void mount_enumerate(Manager *m) {
1715 int r;
1716
1717 assert(m);
1718
1719 mnt_init_debug(0);
1720
1721 if (!m->mount_monitor) {
1722 int fd;
1723
1724 m->mount_monitor = mnt_new_monitor();
1725 if (!m->mount_monitor) {
1726 log_oom();
1727 goto fail;
1728 }
1729
1730 r = mnt_monitor_enable_kernel(m->mount_monitor, 1);
1731 if (r < 0) {
1732 log_error_errno(r, "Failed to enable watching of kernel mount events: %m");
1733 goto fail;
1734 }
1735
1736 r = mnt_monitor_enable_userspace(m->mount_monitor, 1, NULL);
1737 if (r < 0) {
1738 log_error_errno(r, "Failed to enable watching of userspace mount events: %m");
1739 goto fail;
1740 }
1741
1742 /* mnt_unref_monitor() will close the fd */
1743 fd = r = mnt_monitor_get_fd(m->mount_monitor);
1744 if (r < 0) {
1745 log_error_errno(r, "Failed to acquire watch file descriptor: %m");
1746 goto fail;
1747 }
1748
1749 r = sd_event_add_io(m->event, &m->mount_event_source, fd, EPOLLIN, mount_dispatch_io, m);
1750 if (r < 0) {
1751 log_error_errno(r, "Failed to watch mount file descriptor: %m");
1752 goto fail;
1753 }
1754
1755 r = sd_event_source_set_priority(m->mount_event_source, SD_EVENT_PRIORITY_NORMAL-10);
1756 if (r < 0) {
1757 log_error_errno(r, "Failed to adjust mount watch priority: %m");
1758 goto fail;
1759 }
1760
1761 (void) sd_event_source_set_description(m->mount_event_source, "mount-monitor-dispatch");
1762 }
1763
1764 r = mount_load_proc_self_mountinfo(m, false);
1765 if (r < 0)
1766 goto fail;
1767
1768 return;
1769
1770 fail:
1771 mount_shutdown(m);
1772 }
1773
1774 static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
1775 _cleanup_set_free_ Set *around = NULL, *gone = NULL;
1776 Manager *m = userdata;
1777 const char *what;
1778 Iterator i;
1779 Unit *u;
1780 int r;
1781
1782 assert(m);
1783 assert(revents & EPOLLIN);
1784
1785 if (fd == mnt_monitor_get_fd(m->mount_monitor)) {
1786 bool rescan = false;
1787
1788 /* Drain all events and verify that the event is valid.
1789 *
1790 * Note that libmount also monitors /run/mount mkdir if the
1791 * directory does not exist yet. The mkdir may generate event
1792 * which is irrelevant for us.
1793 *
1794 * error: r < 0; valid: r == 0, false positive: rc == 1 */
1795 do {
1796 r = mnt_monitor_next_change(m->mount_monitor, NULL, NULL);
1797 if (r == 0)
1798 rescan = true;
1799 else if (r < 0)
1800 return log_error_errno(r, "Failed to drain libmount events: %m");
1801 } while (r == 0);
1802
1803 log_debug("libmount event [rescan: %s]", yes_no(rescan));
1804 if (!rescan)
1805 return 0;
1806 }
1807
1808 r = mount_load_proc_self_mountinfo(m, true);
1809 if (r < 0) {
1810 /* Reset flags, just in case, for later calls */
1811 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1812 Mount *mount = MOUNT(u);
1813
1814 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1815 }
1816
1817 return 0;
1818 }
1819
1820 manager_dispatch_load_queue(m);
1821
1822 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1823 Mount *mount = MOUNT(u);
1824
1825 if (!mount_is_mounted(mount)) {
1826
1827 /* A mount point is not around right now. It
1828 * might be gone, or might never have
1829 * existed. */
1830
1831 if (mount->from_proc_self_mountinfo &&
1832 mount->parameters_proc_self_mountinfo.what) {
1833
1834 /* Remember that this device might just have disappeared */
1835 if (set_ensure_allocated(&gone, &path_hash_ops) < 0 ||
1836 set_put(gone, mount->parameters_proc_self_mountinfo.what) < 0)
1837 log_oom(); /* we don't care too much about OOM here... */
1838 }
1839
1840 mount->from_proc_self_mountinfo = false;
1841
1842 switch (mount->state) {
1843
1844 case MOUNT_MOUNTED:
1845 /* This has just been unmounted by
1846 * somebody else, follow the state
1847 * change. */
1848 mount->result = MOUNT_SUCCESS; /* make sure we forget any earlier umount failures */
1849 mount_enter_dead(mount, MOUNT_SUCCESS);
1850 break;
1851
1852 default:
1853 break;
1854 }
1855
1856 } else if (mount->just_mounted || mount->just_changed) {
1857
1858 /* A mount point was added or changed */
1859
1860 switch (mount->state) {
1861
1862 case MOUNT_DEAD:
1863 case MOUNT_FAILED:
1864
1865 /* This has just been mounted by somebody else, follow the state change, but let's
1866 * generate a new invocation ID for this implicitly and automatically. */
1867 (void) unit_acquire_invocation_id(UNIT(mount));
1868 mount_enter_mounted(mount, MOUNT_SUCCESS);
1869 break;
1870
1871 case MOUNT_MOUNTING:
1872 mount_set_state(mount, MOUNT_MOUNTING_DONE);
1873 break;
1874
1875 default:
1876 /* Nothing really changed, but let's
1877 * issue an notification call
1878 * nonetheless, in case somebody is
1879 * waiting for this. (e.g. file system
1880 * ro/rw remounts.) */
1881 mount_set_state(mount, mount->state);
1882 break;
1883 }
1884 }
1885
1886 if (mount_is_mounted(mount) &&
1887 mount->from_proc_self_mountinfo &&
1888 mount->parameters_proc_self_mountinfo.what) {
1889
1890 if (set_ensure_allocated(&around, &path_hash_ops) < 0 ||
1891 set_put(around, mount->parameters_proc_self_mountinfo.what) < 0)
1892 log_oom();
1893 }
1894
1895 /* Reset the flags for later calls */
1896 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1897 }
1898
1899 SET_FOREACH(what, gone, i) {
1900 if (set_contains(around, what))
1901 continue;
1902
1903 /* Let the device units know that the device is no longer mounted */
1904 device_found_node(m, what, 0, DEVICE_FOUND_MOUNT);
1905 }
1906
1907 return 0;
1908 }
1909
1910 static void mount_reset_failed(Unit *u) {
1911 Mount *m = MOUNT(u);
1912
1913 assert(m);
1914
1915 if (m->state == MOUNT_FAILED)
1916 mount_set_state(m, MOUNT_DEAD);
1917
1918 m->result = MOUNT_SUCCESS;
1919 m->reload_result = MOUNT_SUCCESS;
1920 }
1921
1922 static int mount_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
1923 Mount *m = MOUNT(u);
1924
1925 assert(m);
1926
1927 return unit_kill_common(u, who, signo, -1, MOUNT(u)->control_pid, error);
1928 }
1929
1930 static int mount_control_pid(Unit *u) {
1931 Mount *m = MOUNT(u);
1932
1933 assert(m);
1934
1935 return m->control_pid;
1936 }
1937
1938 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1939 [MOUNT_EXEC_MOUNT] = "ExecMount",
1940 [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1941 [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1942 };
1943
1944 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1945
1946 static const char* const mount_result_table[_MOUNT_RESULT_MAX] = {
1947 [MOUNT_SUCCESS] = "success",
1948 [MOUNT_FAILURE_RESOURCES] = "resources",
1949 [MOUNT_FAILURE_TIMEOUT] = "timeout",
1950 [MOUNT_FAILURE_EXIT_CODE] = "exit-code",
1951 [MOUNT_FAILURE_SIGNAL] = "signal",
1952 [MOUNT_FAILURE_CORE_DUMP] = "core-dump",
1953 [MOUNT_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
1954 [MOUNT_FAILURE_PROTOCOL] = "protocol",
1955 };
1956
1957 DEFINE_STRING_TABLE_LOOKUP(mount_result, MountResult);
1958
1959 const UnitVTable mount_vtable = {
1960 .object_size = sizeof(Mount),
1961 .exec_context_offset = offsetof(Mount, exec_context),
1962 .cgroup_context_offset = offsetof(Mount, cgroup_context),
1963 .kill_context_offset = offsetof(Mount, kill_context),
1964 .exec_runtime_offset = offsetof(Mount, exec_runtime),
1965 .dynamic_creds_offset = offsetof(Mount, dynamic_creds),
1966
1967 .sections =
1968 "Unit\0"
1969 "Mount\0"
1970 "Install\0",
1971 .private_section = "Mount",
1972
1973 .init = mount_init,
1974 .load = mount_load,
1975 .done = mount_done,
1976
1977 .coldplug = mount_coldplug,
1978
1979 .dump = mount_dump,
1980
1981 .start = mount_start,
1982 .stop = mount_stop,
1983 .reload = mount_reload,
1984
1985 .kill = mount_kill,
1986
1987 .serialize = mount_serialize,
1988 .deserialize_item = mount_deserialize_item,
1989
1990 .active_state = mount_active_state,
1991 .sub_state_to_string = mount_sub_state_to_string,
1992
1993 .may_gc = mount_may_gc,
1994
1995 .sigchld_event = mount_sigchld_event,
1996
1997 .reset_failed = mount_reset_failed,
1998
1999 .control_pid = mount_control_pid,
2000
2001 .bus_vtable = bus_mount_vtable,
2002 .bus_set_property = bus_mount_set_property,
2003 .bus_commit_properties = bus_mount_commit_properties,
2004
2005 .get_timeout = mount_get_timeout,
2006
2007 .can_transient = true,
2008
2009 .enumerate_perpetual = mount_enumerate_perpetual,
2010 .enumerate = mount_enumerate,
2011 .shutdown = mount_shutdown,
2012
2013 .status_message_formats = {
2014 .starting_stopping = {
2015 [0] = "Mounting %s...",
2016 [1] = "Unmounting %s...",
2017 },
2018 .finished_start_job = {
2019 [JOB_DONE] = "Mounted %s.",
2020 [JOB_FAILED] = "Failed to mount %s.",
2021 [JOB_TIMEOUT] = "Timed out mounting %s.",
2022 },
2023 .finished_stop_job = {
2024 [JOB_DONE] = "Unmounted %s.",
2025 [JOB_FAILED] = "Failed unmounting %s.",
2026 [JOB_TIMEOUT] = "Timed out unmounting %s.",
2027 },
2028 },
2029 };
Unnamed repository; edit this file 'description' to name the repository.