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Merge pull request #9005 from fsateler/circular-deps
[thirdparty/systemd.git] / src / core / mount.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2 /***
3 This file is part of systemd.
4
5 Copyright 2010 Lennart Poettering
6 ***/
7
8 #include <errno.h>
9 #include <signal.h>
10 #include <stdio.h>
11 #include <sys/epoll.h>
12
13 #include <libmount.h>
14
15 #include "sd-messages.h"
16
17 #include "alloc-util.h"
18 #include "dbus-mount.h"
19 #include "device.h"
20 #include "escape.h"
21 #include "exit-status.h"
22 #include "format-util.h"
23 #include "fstab-util.h"
24 #include "log.h"
25 #include "manager.h"
26 #include "mkdir.h"
27 #include "mount-setup.h"
28 #include "mount-util.h"
29 #include "mount.h"
30 #include "parse-util.h"
31 #include "path-util.h"
32 #include "process-util.h"
33 #include "special.h"
34 #include "string-table.h"
35 #include "string-util.h"
36 #include "strv.h"
37 #include "unit-name.h"
38 #include "unit.h"
39
40 #define RETRY_UMOUNT_MAX 32
41
42 DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_table*, mnt_free_table);
43 DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_iter*, mnt_free_iter);
44
45 static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
46 [MOUNT_DEAD] = UNIT_INACTIVE,
47 [MOUNT_MOUNTING] = UNIT_ACTIVATING,
48 [MOUNT_MOUNTING_DONE] = UNIT_ACTIVATING,
49 [MOUNT_MOUNTED] = UNIT_ACTIVE,
50 [MOUNT_REMOUNTING] = UNIT_RELOADING,
51 [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
52 [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING,
53 [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING,
54 [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
55 [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
56 [MOUNT_FAILED] = UNIT_FAILED
57 };
58
59 static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
60 static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
61
62 static bool MOUNT_STATE_WITH_PROCESS(MountState state) {
63 return IN_SET(state,
64 MOUNT_MOUNTING,
65 MOUNT_MOUNTING_DONE,
66 MOUNT_REMOUNTING,
67 MOUNT_REMOUNTING_SIGTERM,
68 MOUNT_REMOUNTING_SIGKILL,
69 MOUNT_UNMOUNTING,
70 MOUNT_UNMOUNTING_SIGTERM,
71 MOUNT_UNMOUNTING_SIGKILL);
72 }
73
74 static bool mount_needs_network(const char *options, const char *fstype) {
75 if (fstab_test_option(options, "_netdev\0"))
76 return true;
77
78 if (fstype && fstype_is_network(fstype))
79 return true;
80
81 return false;
82 }
83
84 static bool mount_is_network(const MountParameters *p) {
85 assert(p);
86
87 return mount_needs_network(p->options, p->fstype);
88 }
89
90 static bool mount_is_loop(const MountParameters *p) {
91 assert(p);
92
93 if (fstab_test_option(p->options, "loop\0"))
94 return true;
95
96 return false;
97 }
98
99 static bool mount_is_bind(const MountParameters *p) {
100 assert(p);
101
102 if (fstab_test_option(p->options, "bind\0" "rbind\0"))
103 return true;
104
105 if (p->fstype && STR_IN_SET(p->fstype, "bind", "rbind"))
106 return true;
107
108 return false;
109 }
110
111 static bool mount_is_auto(const MountParameters *p) {
112 assert(p);
113
114 return !fstab_test_option(p->options, "noauto\0");
115 }
116
117 static bool mount_is_automount(const MountParameters *p) {
118 assert(p);
119
120 return fstab_test_option(p->options,
121 "comment=systemd.automount\0"
122 "x-systemd.automount\0");
123 }
124
125 static bool mount_is_bound_to_device(const Mount *m) {
126 const MountParameters *p;
127
128 if (m->from_fragment)
129 return true;
130
131 p = &m->parameters_proc_self_mountinfo;
132 return fstab_test_option(p->options, "x-systemd.device-bound\0");
133 }
134
135 static bool needs_quota(const MountParameters *p) {
136 assert(p);
137
138 /* Quotas are not enabled on network filesystems,
139 * but we want them, for example, on storage connected via iscsi */
140 if (p->fstype && fstype_is_network(p->fstype))
141 return false;
142
143 if (mount_is_bind(p))
144 return false;
145
146 return fstab_test_option(p->options,
147 "usrquota\0" "grpquota\0" "quota\0" "usrjquota\0" "grpjquota\0");
148 }
149
150 static void mount_init(Unit *u) {
151 Mount *m = MOUNT(u);
152
153 assert(u);
154 assert(u->load_state == UNIT_STUB);
155
156 m->timeout_usec = u->manager->default_timeout_start_usec;
157
158 m->exec_context.std_output = u->manager->default_std_output;
159 m->exec_context.std_error = u->manager->default_std_error;
160
161 m->directory_mode = 0755;
162
163 /* We need to make sure that /usr/bin/mount is always called
164 * in the same process group as us, so that the autofs kernel
165 * side doesn't send us another mount request while we are
166 * already trying to comply its last one. */
167 m->exec_context.same_pgrp = true;
168
169 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
170
171 u->ignore_on_isolate = true;
172 }
173
174 static int mount_arm_timer(Mount *m, usec_t usec) {
175 int r;
176
177 assert(m);
178
179 if (m->timer_event_source) {
180 r = sd_event_source_set_time(m->timer_event_source, usec);
181 if (r < 0)
182 return r;
183
184 return sd_event_source_set_enabled(m->timer_event_source, SD_EVENT_ONESHOT);
185 }
186
187 if (usec == USEC_INFINITY)
188 return 0;
189
190 r = sd_event_add_time(
191 UNIT(m)->manager->event,
192 &m->timer_event_source,
193 CLOCK_MONOTONIC,
194 usec, 0,
195 mount_dispatch_timer, m);
196 if (r < 0)
197 return r;
198
199 (void) sd_event_source_set_description(m->timer_event_source, "mount-timer");
200
201 return 0;
202 }
203
204 static void mount_unwatch_control_pid(Mount *m) {
205 assert(m);
206
207 if (m->control_pid <= 0)
208 return;
209
210 unit_unwatch_pid(UNIT(m), m->control_pid);
211 m->control_pid = 0;
212 }
213
214 static void mount_parameters_done(MountParameters *p) {
215 assert(p);
216
217 free(p->what);
218 free(p->options);
219 free(p->fstype);
220
221 p->what = p->options = p->fstype = NULL;
222 }
223
224 static void mount_done(Unit *u) {
225 Mount *m = MOUNT(u);
226
227 assert(m);
228
229 m->where = mfree(m->where);
230
231 mount_parameters_done(&m->parameters_proc_self_mountinfo);
232 mount_parameters_done(&m->parameters_fragment);
233
234 m->exec_runtime = exec_runtime_unref(m->exec_runtime, false);
235 exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
236 m->control_command = NULL;
237
238 dynamic_creds_unref(&m->dynamic_creds);
239
240 mount_unwatch_control_pid(m);
241
242 m->timer_event_source = sd_event_source_unref(m->timer_event_source);
243 }
244
245 _pure_ static MountParameters* get_mount_parameters_fragment(Mount *m) {
246 assert(m);
247
248 if (m->from_fragment)
249 return &m->parameters_fragment;
250
251 return NULL;
252 }
253
254 _pure_ static MountParameters* get_mount_parameters(Mount *m) {
255 assert(m);
256
257 if (m->from_proc_self_mountinfo)
258 return &m->parameters_proc_self_mountinfo;
259
260 return get_mount_parameters_fragment(m);
261 }
262
263 static int mount_add_mount_dependencies(Mount *m) {
264 MountParameters *pm;
265 Unit *other;
266 Iterator i;
267 Set *s;
268 int r;
269
270 assert(m);
271
272 if (!path_equal(m->where, "/")) {
273 _cleanup_free_ char *parent = NULL;
274
275 /* Adds in links to other mount points that might lie further up in the hierarchy */
276
277 parent = dirname_malloc(m->where);
278 if (!parent)
279 return -ENOMEM;
280
281 r = unit_require_mounts_for(UNIT(m), parent, UNIT_DEPENDENCY_IMPLICIT);
282 if (r < 0)
283 return r;
284 }
285
286 /* Adds in dependencies to other mount points that might be needed for the source path (if this is a bind mount
287 * or a loop mount) to be available. */
288 pm = get_mount_parameters_fragment(m);
289 if (pm && pm->what &&
290 path_is_absolute(pm->what) &&
291 (mount_is_bind(pm) || mount_is_loop(pm) || !mount_is_network(pm))) {
292
293 r = unit_require_mounts_for(UNIT(m), pm->what, UNIT_DEPENDENCY_FILE);
294 if (r < 0)
295 return r;
296 }
297
298 /* Adds in dependencies to other units that use this path or paths further down in the hierarchy */
299 s = manager_get_units_requiring_mounts_for(UNIT(m)->manager, m->where);
300 SET_FOREACH(other, s, i) {
301
302 if (other->load_state != UNIT_LOADED)
303 continue;
304
305 if (other == UNIT(m))
306 continue;
307
308 r = unit_add_dependency(other, UNIT_AFTER, UNIT(m), true, UNIT_DEPENDENCY_PATH);
309 if (r < 0)
310 return r;
311
312 if (UNIT(m)->fragment_path) {
313 /* If we have fragment configuration, then make this dependency required */
314 r = unit_add_dependency(other, UNIT_REQUIRES, UNIT(m), true, UNIT_DEPENDENCY_PATH);
315 if (r < 0)
316 return r;
317 }
318 }
319
320 return 0;
321 }
322
323 static int mount_add_device_dependencies(Mount *m) {
324 bool device_wants_mount = false;
325 UnitDependencyMask mask;
326 MountParameters *p;
327 UnitDependency dep;
328 int r;
329
330 assert(m);
331
332 p = get_mount_parameters(m);
333 if (!p)
334 return 0;
335
336 if (!p->what)
337 return 0;
338
339 if (mount_is_bind(p))
340 return 0;
341
342 if (!is_device_path(p->what))
343 return 0;
344
345 /* /dev/root is a really weird thing, it's not a real device,
346 * but just a path the kernel exports for the root file system
347 * specified on the kernel command line. Ignore it here. */
348 if (path_equal(p->what, "/dev/root"))
349 return 0;
350
351 if (path_equal(m->where, "/"))
352 return 0;
353
354 if (mount_is_auto(p) && !mount_is_automount(p) && MANAGER_IS_SYSTEM(UNIT(m)->manager))
355 device_wants_mount = true;
356
357 /* Mount units from /proc/self/mountinfo are not bound to devices
358 * by default since they're subject to races when devices are
359 * unplugged. But the user can still force this dep with an
360 * appropriate option (or udev property) so the mount units are
361 * automatically stopped when the device disappears suddenly. */
362 dep = mount_is_bound_to_device(m) ? UNIT_BINDS_TO : UNIT_REQUIRES;
363
364 mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT;
365
366 r = unit_add_node_dependency(UNIT(m), p->what, device_wants_mount, dep, mask);
367 if (r < 0)
368 return r;
369
370 return 0;
371 }
372
373 static int mount_add_quota_dependencies(Mount *m) {
374 UnitDependencyMask mask;
375 MountParameters *p;
376 int r;
377
378 assert(m);
379
380 if (!MANAGER_IS_SYSTEM(UNIT(m)->manager))
381 return 0;
382
383 p = get_mount_parameters_fragment(m);
384 if (!p)
385 return 0;
386
387 if (!needs_quota(p))
388 return 0;
389
390 mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT;
391
392 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, NULL, true, mask);
393 if (r < 0)
394 return r;
395
396 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, NULL, true, mask);
397 if (r < 0)
398 return r;
399
400 return 0;
401 }
402
403 static bool mount_is_extrinsic(Mount *m) {
404 MountParameters *p;
405 assert(m);
406
407 /* Returns true for all units that are "magic" and should be excluded from the usual start-up and shutdown
408 * dependencies. We call them "extrinsic" here, as they are generally mounted outside of the systemd dependency
409 * logic. We shouldn't attempt to manage them ourselves but it's fine if the user operates on them with us. */
410
411 if (!MANAGER_IS_SYSTEM(UNIT(m)->manager)) /* We only automatically manage mounts if we are in system mode */
412 return true;
413
414 if (PATH_IN_SET(m->where, /* Don't bother with the OS data itself */
415 "/",
416 "/usr"))
417 return true;
418
419 if (PATH_STARTSWITH_SET(m->where,
420 "/run/initramfs", /* This should stay around from before we boot until after we shutdown */
421 "/proc", /* All of this is API VFS */
422 "/sys", /* … dito … */
423 "/dev")) /* … dito … */
424 return true;
425
426 /* If this is an initrd mount, and we are not in the initrd, then leave this around forever, too. */
427 p = get_mount_parameters(m);
428 if (p && fstab_test_option(p->options, "x-initrd.mount\0") && !in_initrd())
429 return true;
430
431 return false;
432 }
433
434 static int mount_add_default_dependencies(Mount *m) {
435 UnitDependencyMask mask;
436 int r;
437 MountParameters *p;
438 const char *after;
439
440 assert(m);
441
442 if (!UNIT(m)->default_dependencies)
443 return 0;
444
445 /* We do not add any default dependencies to /, /usr or /run/initramfs/, since they are guaranteed to stay
446 * mounted the whole time, since our system is on it. Also, don't bother with anything mounted below virtual
447 * file systems, it's also going to be virtual, and hence not worth the effort. */
448 if (mount_is_extrinsic(m))
449 return 0;
450
451 p = get_mount_parameters(m);
452 if (!p)
453 return 0;
454
455 mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_DEFAULT;
456
457 if (mount_is_network(p)) {
458 /* We order ourselves after network.target. This is
459 * primarily useful at shutdown: services that take
460 * down the network should order themselves before
461 * network.target, so that they are shut down only
462 * after this mount unit is stopped. */
463
464 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_NETWORK_TARGET, NULL, true, mask);
465 if (r < 0)
466 return r;
467
468 /* We pull in network-online.target, and order
469 * ourselves after it. This is useful at start-up to
470 * actively pull in tools that want to be started
471 * before we start mounting network file systems, and
472 * whose purpose it is to delay this until the network
473 * is "up". */
474
475 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_WANTS, UNIT_AFTER, SPECIAL_NETWORK_ONLINE_TARGET, NULL, true, mask);
476 if (r < 0)
477 return r;
478
479 after = SPECIAL_REMOTE_FS_PRE_TARGET;
480 } else
481 after = SPECIAL_LOCAL_FS_PRE_TARGET;
482
483 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, NULL, true, mask);
484 if (r < 0)
485 return r;
486
487 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true, mask);
488 if (r < 0)
489 return r;
490
491 /* If this is a tmpfs mount then we have to unmount it before we try to deactivate swaps */
492 if (streq_ptr(p->fstype, "tmpfs")) {
493 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_SWAP_TARGET, NULL, true, mask);
494 if (r < 0)
495 return r;
496 }
497
498 return 0;
499 }
500
501 static int mount_verify(Mount *m) {
502 _cleanup_free_ char *e = NULL;
503 MountParameters *p;
504 int r;
505
506 assert(m);
507
508 if (UNIT(m)->load_state != UNIT_LOADED)
509 return 0;
510
511 if (!m->from_fragment && !m->from_proc_self_mountinfo && !UNIT(m)->perpetual)
512 return -ENOENT;
513
514 r = unit_name_from_path(m->where, ".mount", &e);
515 if (r < 0)
516 return log_unit_error_errno(UNIT(m), r, "Failed to generate unit name from mount path: %m");
517
518 if (!unit_has_name(UNIT(m), e)) {
519 log_unit_error(UNIT(m), "Where= setting doesn't match unit name. Refusing.");
520 return -EINVAL;
521 }
522
523 if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
524 log_unit_error(UNIT(m), "Cannot create mount unit for API file system %s. Refusing.", m->where);
525 return -EINVAL;
526 }
527
528 p = get_mount_parameters_fragment(m);
529 if (p && !p->what) {
530 log_unit_error(UNIT(m), "What= setting is missing. Refusing.");
531 return -EBADMSG;
532 }
533
534 if (m->exec_context.pam_name && m->kill_context.kill_mode != KILL_CONTROL_GROUP) {
535 log_unit_error(UNIT(m), "Unit has PAM enabled. Kill mode must be set to control-group'. Refusing.");
536 return -EINVAL;
537 }
538
539 return 0;
540 }
541
542 static int mount_add_extras(Mount *m) {
543 Unit *u = UNIT(m);
544 int r;
545
546 assert(m);
547
548 if (u->fragment_path)
549 m->from_fragment = true;
550
551 if (!m->where) {
552 r = unit_name_to_path(u->id, &m->where);
553 if (r < 0)
554 return r;
555 }
556
557 path_kill_slashes(m->where);
558
559 if (!u->description) {
560 r = unit_set_description(u, m->where);
561 if (r < 0)
562 return r;
563 }
564
565 r = mount_add_device_dependencies(m);
566 if (r < 0)
567 return r;
568
569 r = mount_add_mount_dependencies(m);
570 if (r < 0)
571 return r;
572
573 r = mount_add_quota_dependencies(m);
574 if (r < 0)
575 return r;
576
577 r = unit_patch_contexts(u);
578 if (r < 0)
579 return r;
580
581 r = unit_add_exec_dependencies(u, &m->exec_context);
582 if (r < 0)
583 return r;
584
585 r = unit_set_default_slice(u);
586 if (r < 0)
587 return r;
588
589 r = mount_add_default_dependencies(m);
590 if (r < 0)
591 return r;
592
593 return 0;
594 }
595
596 static int mount_load_root_mount(Unit *u) {
597 assert(u);
598
599 if (!unit_has_name(u, SPECIAL_ROOT_MOUNT))
600 return 0;
601
602 u->perpetual = true;
603 u->default_dependencies = false;
604
605 /* The stdio/kmsg bridge socket is on /, in order to avoid a dep loop, don't use kmsg logging for -.mount */
606 MOUNT(u)->exec_context.std_output = EXEC_OUTPUT_NULL;
607 MOUNT(u)->exec_context.std_input = EXEC_INPUT_NULL;
608
609 if (!u->description)
610 u->description = strdup("Root Mount");
611
612 return 1;
613 }
614
615 static int mount_load(Unit *u) {
616 Mount *m = MOUNT(u);
617 int r;
618
619 assert(u);
620 assert(u->load_state == UNIT_STUB);
621
622 r = mount_load_root_mount(u);
623 if (r < 0)
624 return r;
625
626 if (m->from_proc_self_mountinfo || u->perpetual)
627 r = unit_load_fragment_and_dropin_optional(u);
628 else
629 r = unit_load_fragment_and_dropin(u);
630 if (r < 0)
631 return r;
632
633 /* This is a new unit? Then let's add in some extras */
634 if (u->load_state == UNIT_LOADED) {
635 r = mount_add_extras(m);
636 if (r < 0)
637 return r;
638 }
639
640 return mount_verify(m);
641 }
642
643 static void mount_set_state(Mount *m, MountState state) {
644 MountState old_state;
645 assert(m);
646
647 old_state = m->state;
648 m->state = state;
649
650 if (!MOUNT_STATE_WITH_PROCESS(state)) {
651 m->timer_event_source = sd_event_source_unref(m->timer_event_source);
652 mount_unwatch_control_pid(m);
653 m->control_command = NULL;
654 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
655 }
656
657 if (state != old_state)
658 log_unit_debug(UNIT(m), "Changed %s -> %s", mount_state_to_string(old_state), mount_state_to_string(state));
659
660 unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state], m->reload_result == MOUNT_SUCCESS);
661 }
662
663 static int mount_coldplug(Unit *u) {
664 Mount *m = MOUNT(u);
665 MountState new_state = MOUNT_DEAD;
666 int r;
667
668 assert(m);
669 assert(m->state == MOUNT_DEAD);
670
671 if (m->deserialized_state != m->state)
672 new_state = m->deserialized_state;
673 else if (m->from_proc_self_mountinfo)
674 new_state = MOUNT_MOUNTED;
675
676 if (new_state == m->state)
677 return 0;
678
679 if (m->control_pid > 0 &&
680 pid_is_unwaited(m->control_pid) &&
681 MOUNT_STATE_WITH_PROCESS(new_state)) {
682
683 r = unit_watch_pid(UNIT(m), m->control_pid);
684 if (r < 0)
685 return r;
686
687 r = mount_arm_timer(m, usec_add(u->state_change_timestamp.monotonic, m->timeout_usec));
688 if (r < 0)
689 return r;
690 }
691
692 if (!IN_SET(new_state, MOUNT_DEAD, MOUNT_FAILED)) {
693 (void) unit_setup_dynamic_creds(u);
694 (void) unit_setup_exec_runtime(u);
695 }
696
697 mount_set_state(m, new_state);
698 return 0;
699 }
700
701 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
702 char buf[FORMAT_TIMESPAN_MAX];
703 Mount *m = MOUNT(u);
704 MountParameters *p;
705
706 assert(m);
707 assert(f);
708
709 p = get_mount_parameters(m);
710
711 fprintf(f,
712 "%sMount State: %s\n"
713 "%sResult: %s\n"
714 "%sWhere: %s\n"
715 "%sWhat: %s\n"
716 "%sFile System Type: %s\n"
717 "%sOptions: %s\n"
718 "%sFrom /proc/self/mountinfo: %s\n"
719 "%sFrom fragment: %s\n"
720 "%sExtrinsic: %s\n"
721 "%sDirectoryMode: %04o\n"
722 "%sSloppyOptions: %s\n"
723 "%sLazyUnmount: %s\n"
724 "%sForceUnmount: %s\n"
725 "%sTimoutSec: %s\n",
726 prefix, mount_state_to_string(m->state),
727 prefix, mount_result_to_string(m->result),
728 prefix, m->where,
729 prefix, p ? strna(p->what) : "n/a",
730 prefix, p ? strna(p->fstype) : "n/a",
731 prefix, p ? strna(p->options) : "n/a",
732 prefix, yes_no(m->from_proc_self_mountinfo),
733 prefix, yes_no(m->from_fragment),
734 prefix, yes_no(mount_is_extrinsic(m)),
735 prefix, m->directory_mode,
736 prefix, yes_no(m->sloppy_options),
737 prefix, yes_no(m->lazy_unmount),
738 prefix, yes_no(m->force_unmount),
739 prefix, format_timespan(buf, sizeof(buf), m->timeout_usec, USEC_PER_SEC));
740
741 if (m->control_pid > 0)
742 fprintf(f,
743 "%sControl PID: "PID_FMT"\n",
744 prefix, m->control_pid);
745
746 exec_context_dump(&m->exec_context, f, prefix);
747 kill_context_dump(&m->kill_context, f, prefix);
748 cgroup_context_dump(&m->cgroup_context, f, prefix);
749 }
750
751 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
752
753 ExecParameters exec_params = {
754 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
755 .stdin_fd = -1,
756 .stdout_fd = -1,
757 .stderr_fd = -1,
758 };
759 pid_t pid;
760 int r;
761
762 assert(m);
763 assert(c);
764 assert(_pid);
765
766 r = unit_prepare_exec(UNIT(m));
767 if (r < 0)
768 return r;
769
770 r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
771 if (r < 0)
772 return r;
773
774 unit_set_exec_params(UNIT(m), &exec_params);
775
776 r = exec_spawn(UNIT(m),
777 c,
778 &m->exec_context,
779 &exec_params,
780 m->exec_runtime,
781 &m->dynamic_creds,
782 &pid);
783 if (r < 0)
784 return r;
785
786 r = unit_watch_pid(UNIT(m), pid);
787 if (r < 0)
788 /* FIXME: we need to do something here */
789 return r;
790
791 *_pid = pid;
792
793 return 0;
794 }
795
796 static void mount_enter_dead(Mount *m, MountResult f) {
797 assert(m);
798
799 if (m->result == MOUNT_SUCCESS)
800 m->result = f;
801
802 if (m->result != MOUNT_SUCCESS)
803 log_unit_warning(UNIT(m), "Failed with result '%s'.", mount_result_to_string(m->result));
804
805 mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD);
806
807 m->exec_runtime = exec_runtime_unref(m->exec_runtime, true);
808
809 exec_context_destroy_runtime_directory(&m->exec_context, UNIT(m)->manager->prefix[EXEC_DIRECTORY_RUNTIME]);
810
811 unit_unref_uid_gid(UNIT(m), true);
812
813 dynamic_creds_destroy(&m->dynamic_creds);
814 }
815
816 static void mount_enter_mounted(Mount *m, MountResult f) {
817 assert(m);
818
819 if (m->result == MOUNT_SUCCESS)
820 m->result = f;
821
822 mount_set_state(m, MOUNT_MOUNTED);
823 }
824
825 static void mount_enter_dead_or_mounted(Mount *m, MountResult f) {
826 assert(m);
827
828 /* Enter DEAD or MOUNTED state, depending on what the kernel currently says about the mount point. We use this
829 * whenever we executed an operation, so that our internal state reflects what the kernel says again, after all
830 * ultimately we just mirror the kernel's internal state on this. */
831
832 if (m->from_proc_self_mountinfo)
833 mount_enter_mounted(m, f);
834 else
835 mount_enter_dead(m, f);
836 }
837
838 static int state_to_kill_operation(MountState state) {
839 switch (state) {
840
841 case MOUNT_REMOUNTING_SIGTERM:
842 case MOUNT_UNMOUNTING_SIGTERM:
843 return KILL_TERMINATE;
844
845 case MOUNT_REMOUNTING_SIGKILL:
846 case MOUNT_UNMOUNTING_SIGKILL:
847 return KILL_KILL;
848
849 default:
850 return _KILL_OPERATION_INVALID;
851 }
852 }
853
854 static void mount_enter_signal(Mount *m, MountState state, MountResult f) {
855 int r;
856
857 assert(m);
858
859 if (m->result == MOUNT_SUCCESS)
860 m->result = f;
861
862 r = unit_kill_context(
863 UNIT(m),
864 &m->kill_context,
865 state_to_kill_operation(state),
866 -1,
867 m->control_pid,
868 false);
869 if (r < 0)
870 goto fail;
871
872 if (r > 0) {
873 r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
874 if (r < 0)
875 goto fail;
876
877 mount_set_state(m, state);
878 } else if (state == MOUNT_REMOUNTING_SIGTERM && m->kill_context.send_sigkill)
879 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
880 else if (IN_SET(state, MOUNT_REMOUNTING_SIGTERM, MOUNT_REMOUNTING_SIGKILL))
881 mount_enter_mounted(m, MOUNT_SUCCESS);
882 else if (state == MOUNT_UNMOUNTING_SIGTERM && m->kill_context.send_sigkill)
883 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS);
884 else
885 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
886
887 return;
888
889 fail:
890 log_unit_warning_errno(UNIT(m), r, "Failed to kill processes: %m");
891 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
892 }
893
894 static void mount_enter_unmounting(Mount *m) {
895 int r;
896
897 assert(m);
898
899 /* Start counting our attempts */
900 if (!IN_SET(m->state,
901 MOUNT_UNMOUNTING,
902 MOUNT_UNMOUNTING_SIGTERM,
903 MOUNT_UNMOUNTING_SIGKILL))
904 m->n_retry_umount = 0;
905
906 m->control_command_id = MOUNT_EXEC_UNMOUNT;
907 m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
908
909 r = exec_command_set(m->control_command, UMOUNT_PATH, m->where, "-c", NULL);
910 if (r >= 0 && m->lazy_unmount)
911 r = exec_command_append(m->control_command, "-l", NULL);
912 if (r >= 0 && m->force_unmount)
913 r = exec_command_append(m->control_command, "-f", NULL);
914 if (r < 0)
915 goto fail;
916
917 mount_unwatch_control_pid(m);
918
919 r = mount_spawn(m, m->control_command, &m->control_pid);
920 if (r < 0)
921 goto fail;
922
923 mount_set_state(m, MOUNT_UNMOUNTING);
924
925 return;
926
927 fail:
928 log_unit_warning_errno(UNIT(m), r, "Failed to run 'umount' task: %m");
929 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
930 }
931
932 static void mount_enter_mounting(Mount *m) {
933 int r;
934 MountParameters *p;
935
936 assert(m);
937
938 r = unit_fail_if_noncanonical(UNIT(m), m->where);
939 if (r < 0)
940 goto fail;
941
942 (void) mkdir_p_label(m->where, m->directory_mode);
943
944 unit_warn_if_dir_nonempty(UNIT(m), m->where);
945
946 unit_warn_leftover_processes(UNIT(m));
947
948 m->control_command_id = MOUNT_EXEC_MOUNT;
949 m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
950
951 /* Create the source directory for bind-mounts if needed */
952 p = get_mount_parameters_fragment(m);
953 if (p && mount_is_bind(p))
954 (void) mkdir_p_label(p->what, m->directory_mode);
955
956 if (p) {
957 _cleanup_free_ char *opts = NULL;
958
959 r = fstab_filter_options(p->options, "nofail\0" "noauto\0" "auto\0", NULL, NULL, &opts);
960 if (r < 0)
961 goto fail;
962
963 r = exec_command_set(m->control_command, MOUNT_PATH, p->what, m->where, NULL);
964 if (r >= 0 && m->sloppy_options)
965 r = exec_command_append(m->control_command, "-s", NULL);
966 if (r >= 0 && p->fstype)
967 r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
968 if (r >= 0 && !isempty(opts))
969 r = exec_command_append(m->control_command, "-o", opts, NULL);
970 } else
971 r = -ENOENT;
972 if (r < 0)
973 goto fail;
974
975 mount_unwatch_control_pid(m);
976
977 r = mount_spawn(m, m->control_command, &m->control_pid);
978 if (r < 0)
979 goto fail;
980
981 mount_set_state(m, MOUNT_MOUNTING);
982
983 return;
984
985 fail:
986 log_unit_warning_errno(UNIT(m), r, "Failed to run 'mount' task: %m");
987 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
988 }
989
990 static void mount_set_reload_result(Mount *m, MountResult result) {
991 assert(m);
992
993 /* Only store the first error we encounter */
994 if (m->reload_result != MOUNT_SUCCESS)
995 return;
996
997 m->reload_result = result;
998 }
999
1000 static void mount_enter_remounting(Mount *m) {
1001 int r;
1002 MountParameters *p;
1003
1004 assert(m);
1005
1006 /* Reset reload result when we are about to start a new remount operation */
1007 m->reload_result = MOUNT_SUCCESS;
1008
1009 m->control_command_id = MOUNT_EXEC_REMOUNT;
1010 m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
1011
1012 p = get_mount_parameters_fragment(m);
1013 if (p) {
1014 const char *o;
1015
1016 if (p->options)
1017 o = strjoina("remount,", p->options);
1018 else
1019 o = "remount";
1020
1021 r = exec_command_set(m->control_command, MOUNT_PATH,
1022 p->what, m->where,
1023 "-o", o, NULL);
1024 if (r >= 0 && m->sloppy_options)
1025 r = exec_command_append(m->control_command, "-s", NULL);
1026 if (r >= 0 && p->fstype)
1027 r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
1028 } else
1029 r = -ENOENT;
1030 if (r < 0)
1031 goto fail;
1032
1033 mount_unwatch_control_pid(m);
1034
1035 r = mount_spawn(m, m->control_command, &m->control_pid);
1036 if (r < 0)
1037 goto fail;
1038
1039 mount_set_state(m, MOUNT_REMOUNTING);
1040
1041 return;
1042
1043 fail:
1044 log_unit_warning_errno(UNIT(m), r, "Failed to run 'remount' task: %m");
1045 mount_set_reload_result(m, MOUNT_FAILURE_RESOURCES);
1046 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1047 }
1048
1049 static int mount_start(Unit *u) {
1050 Mount *m = MOUNT(u);
1051 int r;
1052
1053 assert(m);
1054
1055 /* We cannot fulfill this request right now, try again later
1056 * please! */
1057 if (IN_SET(m->state,
1058 MOUNT_UNMOUNTING,
1059 MOUNT_UNMOUNTING_SIGTERM,
1060 MOUNT_UNMOUNTING_SIGKILL))
1061 return -EAGAIN;
1062
1063 /* Already on it! */
1064 if (m->state == MOUNT_MOUNTING)
1065 return 0;
1066
1067 assert(IN_SET(m->state, MOUNT_DEAD, MOUNT_FAILED));
1068
1069 r = unit_start_limit_test(u);
1070 if (r < 0) {
1071 mount_enter_dead(m, MOUNT_FAILURE_START_LIMIT_HIT);
1072 return r;
1073 }
1074
1075 r = unit_acquire_invocation_id(u);
1076 if (r < 0)
1077 return r;
1078
1079 m->result = MOUNT_SUCCESS;
1080 m->reload_result = MOUNT_SUCCESS;
1081
1082 u->reset_accounting = true;
1083
1084 mount_enter_mounting(m);
1085 return 1;
1086 }
1087
1088 static int mount_stop(Unit *u) {
1089 Mount *m = MOUNT(u);
1090
1091 assert(m);
1092
1093 switch (m->state) {
1094
1095 case MOUNT_UNMOUNTING:
1096 case MOUNT_UNMOUNTING_SIGKILL:
1097 case MOUNT_UNMOUNTING_SIGTERM:
1098 /* Already on it */
1099 return 0;
1100
1101 case MOUNT_MOUNTING:
1102 case MOUNT_MOUNTING_DONE:
1103 case MOUNT_REMOUNTING:
1104 /* If we are still waiting for /bin/mount, we go directly into kill mode. */
1105 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_SUCCESS);
1106 return 0;
1107
1108 case MOUNT_REMOUNTING_SIGTERM:
1109 /* If we are already waiting for a hung remount, convert this to the matching unmounting state */
1110 mount_set_state(m, MOUNT_UNMOUNTING_SIGTERM);
1111 return 0;
1112
1113 case MOUNT_REMOUNTING_SIGKILL:
1114 /* as above */
1115 mount_set_state(m, MOUNT_UNMOUNTING_SIGKILL);
1116 return 0;
1117
1118 case MOUNT_MOUNTED:
1119 mount_enter_unmounting(m);
1120 return 1;
1121
1122 default:
1123 assert_not_reached("Unexpected state.");
1124 }
1125 }
1126
1127 static int mount_reload(Unit *u) {
1128 Mount *m = MOUNT(u);
1129
1130 assert(m);
1131 assert(m->state == MOUNT_MOUNTED);
1132
1133 mount_enter_remounting(m);
1134
1135 return 1;
1136 }
1137
1138 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
1139 Mount *m = MOUNT(u);
1140
1141 assert(m);
1142 assert(f);
1143 assert(fds);
1144
1145 unit_serialize_item(u, f, "state", mount_state_to_string(m->state));
1146 unit_serialize_item(u, f, "result", mount_result_to_string(m->result));
1147 unit_serialize_item(u, f, "reload-result", mount_result_to_string(m->reload_result));
1148
1149 if (m->control_pid > 0)
1150 unit_serialize_item_format(u, f, "control-pid", PID_FMT, m->control_pid);
1151
1152 if (m->control_command_id >= 0)
1153 unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id));
1154
1155 return 0;
1156 }
1157
1158 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1159 Mount *m = MOUNT(u);
1160
1161 assert(u);
1162 assert(key);
1163 assert(value);
1164 assert(fds);
1165
1166 if (streq(key, "state")) {
1167 MountState state;
1168
1169 if ((state = mount_state_from_string(value)) < 0)
1170 log_unit_debug(u, "Failed to parse state value: %s", value);
1171 else
1172 m->deserialized_state = state;
1173 } else if (streq(key, "result")) {
1174 MountResult f;
1175
1176 f = mount_result_from_string(value);
1177 if (f < 0)
1178 log_unit_debug(u, "Failed to parse result value: %s", value);
1179 else if (f != MOUNT_SUCCESS)
1180 m->result = f;
1181
1182 } else if (streq(key, "reload-result")) {
1183 MountResult f;
1184
1185 f = mount_result_from_string(value);
1186 if (f < 0)
1187 log_unit_debug(u, "Failed to parse reload result value: %s", value);
1188 else if (f != MOUNT_SUCCESS)
1189 m->reload_result = f;
1190
1191 } else if (streq(key, "control-pid")) {
1192 pid_t pid;
1193
1194 if (parse_pid(value, &pid) < 0)
1195 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
1196 else
1197 m->control_pid = pid;
1198 } else if (streq(key, "control-command")) {
1199 MountExecCommand id;
1200
1201 id = mount_exec_command_from_string(value);
1202 if (id < 0)
1203 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
1204 else {
1205 m->control_command_id = id;
1206 m->control_command = m->exec_command + id;
1207 }
1208 } else
1209 log_unit_debug(u, "Unknown serialization key: %s", key);
1210
1211 return 0;
1212 }
1213
1214 _pure_ static UnitActiveState mount_active_state(Unit *u) {
1215 assert(u);
1216
1217 return state_translation_table[MOUNT(u)->state];
1218 }
1219
1220 _pure_ static const char *mount_sub_state_to_string(Unit *u) {
1221 assert(u);
1222
1223 return mount_state_to_string(MOUNT(u)->state);
1224 }
1225
1226 _pure_ static bool mount_may_gc(Unit *u) {
1227 Mount *m = MOUNT(u);
1228
1229 assert(m);
1230
1231 if (m->from_proc_self_mountinfo)
1232 return false;
1233
1234 return true;
1235 }
1236
1237 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1238 Mount *m = MOUNT(u);
1239 MountResult f;
1240
1241 assert(m);
1242 assert(pid >= 0);
1243
1244 if (pid != m->control_pid)
1245 return;
1246
1247 m->control_pid = 0;
1248
1249 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
1250 f = MOUNT_SUCCESS;
1251 else if (code == CLD_EXITED)
1252 f = MOUNT_FAILURE_EXIT_CODE;
1253 else if (code == CLD_KILLED)
1254 f = MOUNT_FAILURE_SIGNAL;
1255 else if (code == CLD_DUMPED)
1256 f = MOUNT_FAILURE_CORE_DUMP;
1257 else
1258 assert_not_reached("Unknown code");
1259
1260 if (IN_SET(m->state, MOUNT_REMOUNTING, MOUNT_REMOUNTING_SIGKILL, MOUNT_REMOUNTING_SIGTERM))
1261 mount_set_reload_result(m, f);
1262 else if (m->result == MOUNT_SUCCESS)
1263 m->result = f;
1264
1265 if (m->control_command) {
1266 exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status);
1267
1268 m->control_command = NULL;
1269 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1270 }
1271
1272 log_unit_full(u, f == MOUNT_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0,
1273 "Mount process exited, code=%s status=%i", sigchld_code_to_string(code), status);
1274
1275 /* Note that due to the io event priority logic, we can be sure the new mountinfo is loaded
1276 * before we process the SIGCHLD for the mount command. */
1277
1278 switch (m->state) {
1279
1280 case MOUNT_MOUNTING:
1281 /* Our mount point has not appeared in mountinfo. Something went wrong. */
1282
1283 if (f == MOUNT_SUCCESS) {
1284 /* Either /bin/mount has an unexpected definition of success,
1285 * or someone raced us and we lost. */
1286 log_unit_warning(UNIT(m), "Mount process finished, but there is no mount.");
1287 f = MOUNT_FAILURE_PROTOCOL;
1288 }
1289 mount_enter_dead(m, f);
1290 break;
1291
1292 case MOUNT_MOUNTING_DONE:
1293 mount_enter_mounted(m, f);
1294 break;
1295
1296 case MOUNT_REMOUNTING:
1297 case MOUNT_REMOUNTING_SIGTERM:
1298 case MOUNT_REMOUNTING_SIGKILL:
1299 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1300 break;
1301
1302 case MOUNT_UNMOUNTING:
1303
1304 if (f == MOUNT_SUCCESS && m->from_proc_self_mountinfo) {
1305
1306 /* Still a mount point? If so, let's try again. Most likely there were multiple mount points
1307 * stacked on top of each other. We might exceed the timeout specified by the user overall,
1308 * but we will stop as soon as any one umount times out. */
1309
1310 if (m->n_retry_umount < RETRY_UMOUNT_MAX) {
1311 log_unit_debug(u, "Mount still present, trying again.");
1312 m->n_retry_umount++;
1313 mount_enter_unmounting(m);
1314 } else {
1315 log_unit_warning(u, "Mount still present after %u attempts to unmount, giving up.", m->n_retry_umount);
1316 mount_enter_mounted(m, f);
1317 }
1318 } else
1319 mount_enter_dead_or_mounted(m, f);
1320
1321 break;
1322
1323 case MOUNT_UNMOUNTING_SIGKILL:
1324 case MOUNT_UNMOUNTING_SIGTERM:
1325 mount_enter_dead_or_mounted(m, f);
1326 break;
1327
1328 default:
1329 assert_not_reached("Uh, control process died at wrong time.");
1330 }
1331
1332 /* Notify clients about changed exit status */
1333 unit_add_to_dbus_queue(u);
1334 }
1335
1336 static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
1337 Mount *m = MOUNT(userdata);
1338
1339 assert(m);
1340 assert(m->timer_event_source == source);
1341
1342 switch (m->state) {
1343
1344 case MOUNT_MOUNTING:
1345 case MOUNT_MOUNTING_DONE:
1346 log_unit_warning(UNIT(m), "Mounting timed out. Terminating.");
1347 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1348 break;
1349
1350 case MOUNT_REMOUNTING:
1351 log_unit_warning(UNIT(m), "Remounting timed out. Terminating remount process.");
1352 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1353 mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, MOUNT_SUCCESS);
1354 break;
1355
1356 case MOUNT_REMOUNTING_SIGTERM:
1357 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1358
1359 if (m->kill_context.send_sigkill) {
1360 log_unit_warning(UNIT(m), "Remounting timed out. Killing.");
1361 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
1362 } else {
1363 log_unit_warning(UNIT(m), "Remounting timed out. Skipping SIGKILL. Ignoring.");
1364 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1365 }
1366 break;
1367
1368 case MOUNT_REMOUNTING_SIGKILL:
1369 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1370
1371 log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
1372 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1373 break;
1374
1375 case MOUNT_UNMOUNTING:
1376 log_unit_warning(UNIT(m), "Unmounting timed out. Terminating.");
1377 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1378 break;
1379
1380 case MOUNT_UNMOUNTING_SIGTERM:
1381 if (m->kill_context.send_sigkill) {
1382 log_unit_warning(UNIT(m), "Mount process timed out. Killing.");
1383 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
1384 } else {
1385 log_unit_warning(UNIT(m), "Mount process timed out. Skipping SIGKILL. Ignoring.");
1386 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
1387 }
1388 break;
1389
1390 case MOUNT_UNMOUNTING_SIGKILL:
1391 log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
1392 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
1393 break;
1394
1395 default:
1396 assert_not_reached("Timeout at wrong time.");
1397 }
1398
1399 return 0;
1400 }
1401
1402 typedef struct {
1403 bool is_mounted;
1404 bool just_mounted;
1405 bool just_changed;
1406 } MountSetupFlags;
1407
1408 static int mount_setup_new_unit(
1409 Unit *u,
1410 const char *what,
1411 const char *where,
1412 const char *options,
1413 const char *fstype,
1414 MountSetupFlags *flags) {
1415
1416 MountParameters *p;
1417
1418 assert(u);
1419 assert(flags);
1420
1421 u->source_path = strdup("/proc/self/mountinfo");
1422 MOUNT(u)->where = strdup(where);
1423 if (!u->source_path || !MOUNT(u)->where)
1424 return -ENOMEM;
1425
1426 /* Make sure to initialize those fields before mount_is_extrinsic(). */
1427 MOUNT(u)->from_proc_self_mountinfo = true;
1428 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1429
1430 p->what = strdup(what);
1431 p->options = strdup(options);
1432 p->fstype = strdup(fstype);
1433 if (!p->what || !p->options || !p->fstype)
1434 return -ENOMEM;
1435
1436 if (!mount_is_extrinsic(MOUNT(u))) {
1437 const char *target;
1438 int r;
1439
1440 target = mount_is_network(p) ? SPECIAL_REMOTE_FS_TARGET : SPECIAL_LOCAL_FS_TARGET;
1441 r = unit_add_dependency_by_name(u, UNIT_BEFORE, target, NULL, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
1442 if (r < 0)
1443 return r;
1444
1445 r = unit_add_dependency_by_name(u, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
1446 if (r < 0)
1447 return r;
1448 }
1449
1450 unit_add_to_load_queue(u);
1451 flags->is_mounted = true;
1452 flags->just_mounted = true;
1453 flags->just_changed = true;
1454
1455 return 0;
1456 }
1457
1458 static int mount_setup_existing_unit(
1459 Unit *u,
1460 const char *what,
1461 const char *where,
1462 const char *options,
1463 const char *fstype,
1464 MountSetupFlags *flags) {
1465
1466 MountParameters *p;
1467 bool load_extras = false;
1468 int r1, r2, r3;
1469
1470 assert(u);
1471 assert(flags);
1472
1473 if (!MOUNT(u)->where) {
1474 MOUNT(u)->where = strdup(where);
1475 if (!MOUNT(u)->where)
1476 return -ENOMEM;
1477 }
1478
1479 /* Make sure to initialize those fields before mount_is_extrinsic(). */
1480 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1481
1482 r1 = free_and_strdup(&p->what, what);
1483 r2 = free_and_strdup(&p->options, options);
1484 r3 = free_and_strdup(&p->fstype, fstype);
1485 if (r1 < 0 || r2 < 0 || r3 < 0)
1486 return -ENOMEM;
1487
1488 flags->just_changed = r1 > 0 || r2 > 0 || r3 > 0;
1489 flags->is_mounted = true;
1490 flags->just_mounted = !MOUNT(u)->from_proc_self_mountinfo || MOUNT(u)->just_mounted;
1491
1492 MOUNT(u)->from_proc_self_mountinfo = true;
1493
1494 if (!mount_is_extrinsic(MOUNT(u)) && mount_is_network(p)) {
1495 /* _netdev option may have shown up late, or on a
1496 * remount. Add remote-fs dependencies, even though
1497 * local-fs ones may already be there.
1498 *
1499 * Note: due to a current limitation (we don't track
1500 * in the dependency "Set*" objects who created a
1501 * dependency), we can only add deps, never lose them,
1502 * until the next full daemon-reload. */
1503 unit_add_dependency_by_name(u, UNIT_BEFORE, SPECIAL_REMOTE_FS_TARGET, NULL, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
1504 load_extras = true;
1505 }
1506
1507 if (u->load_state == UNIT_NOT_FOUND) {
1508 u->load_state = UNIT_LOADED;
1509 u->load_error = 0;
1510
1511 /* Load in the extras later on, after we
1512 * finished initialization of the unit */
1513
1514 /* FIXME: since we're going to load the unit later on, why setting load_extras=true ? */
1515 load_extras = true;
1516 flags->just_changed = true;
1517 }
1518
1519 if (load_extras)
1520 return mount_add_extras(MOUNT(u));
1521
1522 return 0;
1523 }
1524
1525 static int mount_setup_unit(
1526 Manager *m,
1527 const char *what,
1528 const char *where,
1529 const char *options,
1530 const char *fstype,
1531 bool set_flags) {
1532
1533 _cleanup_free_ char *e = NULL;
1534 MountSetupFlags flags;
1535 Unit *u;
1536 int r;
1537
1538 assert(m);
1539 assert(what);
1540 assert(where);
1541 assert(options);
1542 assert(fstype);
1543
1544 /* Ignore API mount points. They should never be referenced in
1545 * dependencies ever. */
1546 if (mount_point_is_api(where) || mount_point_ignore(where))
1547 return 0;
1548
1549 if (streq(fstype, "autofs"))
1550 return 0;
1551
1552 /* probably some kind of swap, ignore */
1553 if (!is_path(where))
1554 return 0;
1555
1556 r = unit_name_from_path(where, ".mount", &e);
1557 if (r < 0)
1558 return r;
1559
1560 u = manager_get_unit(m, e);
1561 if (!u) {
1562 /* First time we see this mount point meaning that it's
1563 * not been initiated by a mount unit but rather by the
1564 * sysadmin having called mount(8) directly. */
1565 r = unit_new_for_name(m, sizeof(Mount), e, &u);
1566 if (r < 0)
1567 goto fail;
1568
1569 r = mount_setup_new_unit(u, what, where, options, fstype, &flags);
1570 if (r < 0)
1571 unit_free(u);
1572 } else
1573 r = mount_setup_existing_unit(u, what, where, options, fstype, &flags);
1574
1575 if (r < 0)
1576 goto fail;
1577
1578 if (set_flags) {
1579 MOUNT(u)->is_mounted = flags.is_mounted;
1580 MOUNT(u)->just_mounted = flags.just_mounted;
1581 MOUNT(u)->just_changed = flags.just_changed;
1582 }
1583
1584 if (flags.just_changed)
1585 unit_add_to_dbus_queue(u);
1586
1587 return 0;
1588 fail:
1589 log_warning_errno(r, "Failed to set up mount unit: %m");
1590 return r;
1591 }
1592
1593 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1594 _cleanup_(mnt_free_tablep) struct libmnt_table *t = NULL;
1595 _cleanup_(mnt_free_iterp) struct libmnt_iter *i = NULL;
1596 int r = 0;
1597
1598 assert(m);
1599
1600 t = mnt_new_table();
1601 i = mnt_new_iter(MNT_ITER_FORWARD);
1602 if (!t || !i)
1603 return log_oom();
1604
1605 r = mnt_table_parse_mtab(t, NULL);
1606 if (r < 0)
1607 return log_error_errno(r, "Failed to parse /proc/self/mountinfo: %m");
1608
1609 r = 0;
1610 for (;;) {
1611 struct libmnt_fs *fs;
1612 const char *device, *path, *options, *fstype;
1613 _cleanup_free_ char *d = NULL, *p = NULL;
1614 int k;
1615
1616 k = mnt_table_next_fs(t, i, &fs);
1617 if (k == 1)
1618 break;
1619 if (k < 0)
1620 return log_error_errno(k, "Failed to get next entry from /proc/self/mountinfo: %m");
1621
1622 device = mnt_fs_get_source(fs);
1623 path = mnt_fs_get_target(fs);
1624 options = mnt_fs_get_options(fs);
1625 fstype = mnt_fs_get_fstype(fs);
1626
1627 if (!device || !path)
1628 continue;
1629
1630 if (cunescape(device, UNESCAPE_RELAX, &d) < 0)
1631 return log_oom();
1632
1633 if (cunescape(path, UNESCAPE_RELAX, &p) < 0)
1634 return log_oom();
1635
1636 (void) device_found_node(m, d, true, DEVICE_FOUND_MOUNT, set_flags);
1637
1638 k = mount_setup_unit(m, d, p, options, fstype, set_flags);
1639 if (r == 0 && k < 0)
1640 r = k;
1641 }
1642
1643 return r;
1644 }
1645
1646 static void mount_shutdown(Manager *m) {
1647 assert(m);
1648
1649 m->mount_event_source = sd_event_source_unref(m->mount_event_source);
1650
1651 mnt_unref_monitor(m->mount_monitor);
1652 m->mount_monitor = NULL;
1653 }
1654
1655 static int mount_get_timeout(Unit *u, usec_t *timeout) {
1656 Mount *m = MOUNT(u);
1657 usec_t t;
1658 int r;
1659
1660 if (!m->timer_event_source)
1661 return 0;
1662
1663 r = sd_event_source_get_time(m->timer_event_source, &t);
1664 if (r < 0)
1665 return r;
1666 if (t == USEC_INFINITY)
1667 return 0;
1668
1669 *timeout = t;
1670 return 1;
1671 }
1672
1673 static int synthesize_root_mount(Manager *m) {
1674 Unit *u;
1675 int r;
1676
1677 assert(m);
1678
1679 /* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's
1680 * unconditionally synthesize it here and mark it as perpetual. */
1681
1682 u = manager_get_unit(m, SPECIAL_ROOT_MOUNT);
1683 if (!u) {
1684 r = unit_new_for_name(m, sizeof(Mount), SPECIAL_ROOT_MOUNT, &u);
1685 if (r < 0)
1686 return log_error_errno(r, "Failed to allocate the special " SPECIAL_ROOT_MOUNT " unit: %m");
1687 }
1688
1689 u->perpetual = true;
1690 MOUNT(u)->deserialized_state = MOUNT_MOUNTED;
1691
1692 unit_add_to_load_queue(u);
1693 unit_add_to_dbus_queue(u);
1694
1695 return 0;
1696 }
1697
1698 static bool mount_is_mounted(Mount *m) {
1699 assert(m);
1700
1701 return UNIT(m)->perpetual || m->is_mounted;
1702 }
1703
1704 static void mount_enumerate(Manager *m) {
1705 int r;
1706
1707 assert(m);
1708
1709 r = synthesize_root_mount(m);
1710 if (r < 0)
1711 goto fail;
1712
1713 mnt_init_debug(0);
1714
1715 if (!m->mount_monitor) {
1716 int fd;
1717
1718 m->mount_monitor = mnt_new_monitor();
1719 if (!m->mount_monitor) {
1720 log_oom();
1721 goto fail;
1722 }
1723
1724 r = mnt_monitor_enable_kernel(m->mount_monitor, 1);
1725 if (r < 0) {
1726 log_error_errno(r, "Failed to enable watching of kernel mount events: %m");
1727 goto fail;
1728 }
1729
1730 r = mnt_monitor_enable_userspace(m->mount_monitor, 1, NULL);
1731 if (r < 0) {
1732 log_error_errno(r, "Failed to enable watching of userspace mount events: %m");
1733 goto fail;
1734 }
1735
1736 /* mnt_unref_monitor() will close the fd */
1737 fd = r = mnt_monitor_get_fd(m->mount_monitor);
1738 if (r < 0) {
1739 log_error_errno(r, "Failed to acquire watch file descriptor: %m");
1740 goto fail;
1741 }
1742
1743 r = sd_event_add_io(m->event, &m->mount_event_source, fd, EPOLLIN, mount_dispatch_io, m);
1744 if (r < 0) {
1745 log_error_errno(r, "Failed to watch mount file descriptor: %m");
1746 goto fail;
1747 }
1748
1749 r = sd_event_source_set_priority(m->mount_event_source, SD_EVENT_PRIORITY_NORMAL-10);
1750 if (r < 0) {
1751 log_error_errno(r, "Failed to adjust mount watch priority: %m");
1752 goto fail;
1753 }
1754
1755 (void) sd_event_source_set_description(m->mount_event_source, "mount-monitor-dispatch");
1756 }
1757
1758 r = mount_load_proc_self_mountinfo(m, false);
1759 if (r < 0)
1760 goto fail;
1761
1762 return;
1763
1764 fail:
1765 mount_shutdown(m);
1766 }
1767
1768 static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
1769 _cleanup_set_free_ Set *around = NULL, *gone = NULL;
1770 Manager *m = userdata;
1771 const char *what;
1772 Iterator i;
1773 Unit *u;
1774 int r;
1775
1776 assert(m);
1777 assert(revents & EPOLLIN);
1778
1779 if (fd == mnt_monitor_get_fd(m->mount_monitor)) {
1780 bool rescan = false;
1781
1782 /* Drain all events and verify that the event is valid.
1783 *
1784 * Note that libmount also monitors /run/mount mkdir if the
1785 * directory does not exist yet. The mkdir may generate event
1786 * which is irrelevant for us.
1787 *
1788 * error: r < 0; valid: r == 0, false positive: rc == 1 */
1789 do {
1790 r = mnt_monitor_next_change(m->mount_monitor, NULL, NULL);
1791 if (r == 0)
1792 rescan = true;
1793 else if (r < 0)
1794 return log_error_errno(r, "Failed to drain libmount events");
1795 } while (r == 0);
1796
1797 log_debug("libmount event [rescan: %s]", yes_no(rescan));
1798 if (!rescan)
1799 return 0;
1800 }
1801
1802 r = mount_load_proc_self_mountinfo(m, true);
1803 if (r < 0) {
1804 /* Reset flags, just in case, for later calls */
1805 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1806 Mount *mount = MOUNT(u);
1807
1808 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1809 }
1810
1811 return 0;
1812 }
1813
1814 manager_dispatch_load_queue(m);
1815
1816 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1817 Mount *mount = MOUNT(u);
1818
1819 if (!mount_is_mounted(mount)) {
1820
1821 /* A mount point is not around right now. It
1822 * might be gone, or might never have
1823 * existed. */
1824
1825 if (mount->from_proc_self_mountinfo &&
1826 mount->parameters_proc_self_mountinfo.what) {
1827
1828 /* Remember that this device might just have disappeared */
1829 if (set_ensure_allocated(&gone, &path_hash_ops) < 0 ||
1830 set_put(gone, mount->parameters_proc_self_mountinfo.what) < 0)
1831 log_oom(); /* we don't care too much about OOM here... */
1832 }
1833
1834 mount->from_proc_self_mountinfo = false;
1835
1836 switch (mount->state) {
1837
1838 case MOUNT_MOUNTED:
1839 /* This has just been unmounted by
1840 * somebody else, follow the state
1841 * change. */
1842 mount->result = MOUNT_SUCCESS; /* make sure we forget any earlier umount failures */
1843 mount_enter_dead(mount, MOUNT_SUCCESS);
1844 break;
1845
1846 default:
1847 break;
1848 }
1849
1850 } else if (mount->just_mounted || mount->just_changed) {
1851
1852 /* A mount point was added or changed */
1853
1854 switch (mount->state) {
1855
1856 case MOUNT_DEAD:
1857 case MOUNT_FAILED:
1858
1859 /* This has just been mounted by somebody else, follow the state change, but let's
1860 * generate a new invocation ID for this implicitly and automatically. */
1861 (void) unit_acquire_invocation_id(UNIT(mount));
1862 mount_enter_mounted(mount, MOUNT_SUCCESS);
1863 break;
1864
1865 case MOUNT_MOUNTING:
1866 mount_set_state(mount, MOUNT_MOUNTING_DONE);
1867 break;
1868
1869 default:
1870 /* Nothing really changed, but let's
1871 * issue an notification call
1872 * nonetheless, in case somebody is
1873 * waiting for this. (e.g. file system
1874 * ro/rw remounts.) */
1875 mount_set_state(mount, mount->state);
1876 break;
1877 }
1878 }
1879
1880 if (mount_is_mounted(mount) &&
1881 mount->from_proc_self_mountinfo &&
1882 mount->parameters_proc_self_mountinfo.what) {
1883
1884 if (set_ensure_allocated(&around, &path_hash_ops) < 0 ||
1885 set_put(around, mount->parameters_proc_self_mountinfo.what) < 0)
1886 log_oom();
1887 }
1888
1889 /* Reset the flags for later calls */
1890 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1891 }
1892
1893 SET_FOREACH(what, gone, i) {
1894 if (set_contains(around, what))
1895 continue;
1896
1897 /* Let the device units know that the device is no longer mounted */
1898 (void) device_found_node(m, what, false, DEVICE_FOUND_MOUNT, true);
1899 }
1900
1901 return 0;
1902 }
1903
1904 static void mount_reset_failed(Unit *u) {
1905 Mount *m = MOUNT(u);
1906
1907 assert(m);
1908
1909 if (m->state == MOUNT_FAILED)
1910 mount_set_state(m, MOUNT_DEAD);
1911
1912 m->result = MOUNT_SUCCESS;
1913 m->reload_result = MOUNT_SUCCESS;
1914 }
1915
1916 static int mount_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
1917 Mount *m = MOUNT(u);
1918
1919 assert(m);
1920
1921 return unit_kill_common(u, who, signo, -1, MOUNT(u)->control_pid, error);
1922 }
1923
1924 static int mount_control_pid(Unit *u) {
1925 Mount *m = MOUNT(u);
1926
1927 assert(m);
1928
1929 return m->control_pid;
1930 }
1931
1932 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1933 [MOUNT_EXEC_MOUNT] = "ExecMount",
1934 [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1935 [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1936 };
1937
1938 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1939
1940 static const char* const mount_result_table[_MOUNT_RESULT_MAX] = {
1941 [MOUNT_SUCCESS] = "success",
1942 [MOUNT_FAILURE_RESOURCES] = "resources",
1943 [MOUNT_FAILURE_TIMEOUT] = "timeout",
1944 [MOUNT_FAILURE_EXIT_CODE] = "exit-code",
1945 [MOUNT_FAILURE_SIGNAL] = "signal",
1946 [MOUNT_FAILURE_CORE_DUMP] = "core-dump",
1947 [MOUNT_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
1948 [MOUNT_FAILURE_PROTOCOL] = "protocol",
1949 };
1950
1951 DEFINE_STRING_TABLE_LOOKUP(mount_result, MountResult);
1952
1953 const UnitVTable mount_vtable = {
1954 .object_size = sizeof(Mount),
1955 .exec_context_offset = offsetof(Mount, exec_context),
1956 .cgroup_context_offset = offsetof(Mount, cgroup_context),
1957 .kill_context_offset = offsetof(Mount, kill_context),
1958 .exec_runtime_offset = offsetof(Mount, exec_runtime),
1959 .dynamic_creds_offset = offsetof(Mount, dynamic_creds),
1960
1961 .sections =
1962 "Unit\0"
1963 "Mount\0"
1964 "Install\0",
1965 .private_section = "Mount",
1966
1967 .init = mount_init,
1968 .load = mount_load,
1969 .done = mount_done,
1970
1971 .coldplug = mount_coldplug,
1972
1973 .dump = mount_dump,
1974
1975 .start = mount_start,
1976 .stop = mount_stop,
1977 .reload = mount_reload,
1978
1979 .kill = mount_kill,
1980
1981 .serialize = mount_serialize,
1982 .deserialize_item = mount_deserialize_item,
1983
1984 .active_state = mount_active_state,
1985 .sub_state_to_string = mount_sub_state_to_string,
1986
1987 .may_gc = mount_may_gc,
1988
1989 .sigchld_event = mount_sigchld_event,
1990
1991 .reset_failed = mount_reset_failed,
1992
1993 .control_pid = mount_control_pid,
1994
1995 .bus_vtable = bus_mount_vtable,
1996 .bus_set_property = bus_mount_set_property,
1997 .bus_commit_properties = bus_mount_commit_properties,
1998
1999 .get_timeout = mount_get_timeout,
2000
2001 .can_transient = true,
2002
2003 .enumerate = mount_enumerate,
2004 .shutdown = mount_shutdown,
2005
2006 .status_message_formats = {
2007 .starting_stopping = {
2008 [0] = "Mounting %s...",
2009 [1] = "Unmounting %s...",
2010 },
2011 .finished_start_job = {
2012 [JOB_DONE] = "Mounted %s.",
2013 [JOB_FAILED] = "Failed to mount %s.",
2014 [JOB_TIMEOUT] = "Timed out mounting %s.",
2015 },
2016 .finished_stop_job = {
2017 [JOB_DONE] = "Unmounted %s.",
2018 [JOB_FAILED] = "Failed unmounting %s.",
2019 [JOB_TIMEOUT] = "Timed out unmounting %s.",
2020 },
2021 },
2022 };
Unnamed repository; edit this file 'description' to name the repository.