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