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Merge pull request #9158 from poettering/notify-auto-reload
[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_simplify(m->where, false);
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],
661 m->reload_result == MOUNT_SUCCESS ? 0 : UNIT_NOTIFY_RELOAD_FAILURE);
662 }
663
664 static int mount_coldplug(Unit *u) {
665 Mount *m = MOUNT(u);
666 MountState new_state = MOUNT_DEAD;
667 int r;
668
669 assert(m);
670 assert(m->state == MOUNT_DEAD);
671
672 if (m->deserialized_state != m->state)
673 new_state = m->deserialized_state;
674 else if (m->from_proc_self_mountinfo)
675 new_state = MOUNT_MOUNTED;
676
677 if (new_state == m->state)
678 return 0;
679
680 if (m->control_pid > 0 &&
681 pid_is_unwaited(m->control_pid) &&
682 MOUNT_STATE_WITH_PROCESS(new_state)) {
683
684 r = unit_watch_pid(UNIT(m), m->control_pid);
685 if (r < 0)
686 return r;
687
688 r = mount_arm_timer(m, usec_add(u->state_change_timestamp.monotonic, m->timeout_usec));
689 if (r < 0)
690 return r;
691 }
692
693 if (!IN_SET(new_state, MOUNT_DEAD, MOUNT_FAILED)) {
694 (void) unit_setup_dynamic_creds(u);
695 (void) unit_setup_exec_runtime(u);
696 }
697
698 mount_set_state(m, new_state);
699 return 0;
700 }
701
702 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
703 char buf[FORMAT_TIMESPAN_MAX];
704 Mount *m = MOUNT(u);
705 MountParameters *p;
706
707 assert(m);
708 assert(f);
709
710 p = get_mount_parameters(m);
711
712 fprintf(f,
713 "%sMount State: %s\n"
714 "%sResult: %s\n"
715 "%sWhere: %s\n"
716 "%sWhat: %s\n"
717 "%sFile System Type: %s\n"
718 "%sOptions: %s\n"
719 "%sFrom /proc/self/mountinfo: %s\n"
720 "%sFrom fragment: %s\n"
721 "%sExtrinsic: %s\n"
722 "%sDirectoryMode: %04o\n"
723 "%sSloppyOptions: %s\n"
724 "%sLazyUnmount: %s\n"
725 "%sForceUnmount: %s\n"
726 "%sTimoutSec: %s\n",
727 prefix, mount_state_to_string(m->state),
728 prefix, mount_result_to_string(m->result),
729 prefix, m->where,
730 prefix, p ? strna(p->what) : "n/a",
731 prefix, p ? strna(p->fstype) : "n/a",
732 prefix, p ? strna(p->options) : "n/a",
733 prefix, yes_no(m->from_proc_self_mountinfo),
734 prefix, yes_no(m->from_fragment),
735 prefix, yes_no(mount_is_extrinsic(m)),
736 prefix, m->directory_mode,
737 prefix, yes_no(m->sloppy_options),
738 prefix, yes_no(m->lazy_unmount),
739 prefix, yes_no(m->force_unmount),
740 prefix, format_timespan(buf, sizeof(buf), m->timeout_usec, USEC_PER_SEC));
741
742 if (m->control_pid > 0)
743 fprintf(f,
744 "%sControl PID: "PID_FMT"\n",
745 prefix, m->control_pid);
746
747 exec_context_dump(&m->exec_context, f, prefix);
748 kill_context_dump(&m->kill_context, f, prefix);
749 cgroup_context_dump(&m->cgroup_context, f, prefix);
750 }
751
752 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
753
754 ExecParameters exec_params = {
755 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
756 .stdin_fd = -1,
757 .stdout_fd = -1,
758 .stderr_fd = -1,
759 };
760 pid_t pid;
761 int r;
762
763 assert(m);
764 assert(c);
765 assert(_pid);
766
767 r = unit_prepare_exec(UNIT(m));
768 if (r < 0)
769 return r;
770
771 r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
772 if (r < 0)
773 return r;
774
775 unit_set_exec_params(UNIT(m), &exec_params);
776
777 r = exec_spawn(UNIT(m),
778 c,
779 &m->exec_context,
780 &exec_params,
781 m->exec_runtime,
782 &m->dynamic_creds,
783 &pid);
784 if (r < 0)
785 return r;
786
787 r = unit_watch_pid(UNIT(m), pid);
788 if (r < 0)
789 /* FIXME: we need to do something here */
790 return r;
791
792 *_pid = pid;
793
794 return 0;
795 }
796
797 static void mount_enter_dead(Mount *m, MountResult f) {
798 assert(m);
799
800 if (m->result == MOUNT_SUCCESS)
801 m->result = f;
802
803 if (m->result != MOUNT_SUCCESS)
804 log_unit_warning(UNIT(m), "Failed with result '%s'.", mount_result_to_string(m->result));
805
806 mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD);
807
808 m->exec_runtime = exec_runtime_unref(m->exec_runtime, true);
809
810 exec_context_destroy_runtime_directory(&m->exec_context, UNIT(m)->manager->prefix[EXEC_DIRECTORY_RUNTIME]);
811
812 unit_unref_uid_gid(UNIT(m), true);
813
814 dynamic_creds_destroy(&m->dynamic_creds);
815 }
816
817 static void mount_enter_mounted(Mount *m, MountResult f) {
818 assert(m);
819
820 if (m->result == MOUNT_SUCCESS)
821 m->result = f;
822
823 mount_set_state(m, MOUNT_MOUNTED);
824 }
825
826 static void mount_enter_dead_or_mounted(Mount *m, MountResult f) {
827 assert(m);
828
829 /* Enter DEAD or MOUNTED state, depending on what the kernel currently says about the mount point. We use this
830 * whenever we executed an operation, so that our internal state reflects what the kernel says again, after all
831 * ultimately we just mirror the kernel's internal state on this. */
832
833 if (m->from_proc_self_mountinfo)
834 mount_enter_mounted(m, f);
835 else
836 mount_enter_dead(m, f);
837 }
838
839 static int state_to_kill_operation(MountState state) {
840 switch (state) {
841
842 case MOUNT_REMOUNTING_SIGTERM:
843 case MOUNT_UNMOUNTING_SIGTERM:
844 return KILL_TERMINATE;
845
846 case MOUNT_REMOUNTING_SIGKILL:
847 case MOUNT_UNMOUNTING_SIGKILL:
848 return KILL_KILL;
849
850 default:
851 return _KILL_OPERATION_INVALID;
852 }
853 }
854
855 static void mount_enter_signal(Mount *m, MountState state, MountResult f) {
856 int r;
857
858 assert(m);
859
860 if (m->result == MOUNT_SUCCESS)
861 m->result = f;
862
863 r = unit_kill_context(
864 UNIT(m),
865 &m->kill_context,
866 state_to_kill_operation(state),
867 -1,
868 m->control_pid,
869 false);
870 if (r < 0)
871 goto fail;
872
873 if (r > 0) {
874 r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
875 if (r < 0)
876 goto fail;
877
878 mount_set_state(m, state);
879 } else if (state == MOUNT_REMOUNTING_SIGTERM && m->kill_context.send_sigkill)
880 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
881 else if (IN_SET(state, MOUNT_REMOUNTING_SIGTERM, MOUNT_REMOUNTING_SIGKILL))
882 mount_enter_mounted(m, MOUNT_SUCCESS);
883 else if (state == MOUNT_UNMOUNTING_SIGTERM && m->kill_context.send_sigkill)
884 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS);
885 else
886 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
887
888 return;
889
890 fail:
891 log_unit_warning_errno(UNIT(m), r, "Failed to kill processes: %m");
892 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
893 }
894
895 static void mount_enter_unmounting(Mount *m) {
896 int r;
897
898 assert(m);
899
900 /* Start counting our attempts */
901 if (!IN_SET(m->state,
902 MOUNT_UNMOUNTING,
903 MOUNT_UNMOUNTING_SIGTERM,
904 MOUNT_UNMOUNTING_SIGKILL))
905 m->n_retry_umount = 0;
906
907 m->control_command_id = MOUNT_EXEC_UNMOUNT;
908 m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
909
910 r = exec_command_set(m->control_command, UMOUNT_PATH, m->where, "-c", NULL);
911 if (r >= 0 && m->lazy_unmount)
912 r = exec_command_append(m->control_command, "-l", NULL);
913 if (r >= 0 && m->force_unmount)
914 r = exec_command_append(m->control_command, "-f", NULL);
915 if (r < 0)
916 goto fail;
917
918 mount_unwatch_control_pid(m);
919
920 r = mount_spawn(m, m->control_command, &m->control_pid);
921 if (r < 0)
922 goto fail;
923
924 mount_set_state(m, MOUNT_UNMOUNTING);
925
926 return;
927
928 fail:
929 log_unit_warning_errno(UNIT(m), r, "Failed to run 'umount' task: %m");
930 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
931 }
932
933 static void mount_enter_mounting(Mount *m) {
934 int r;
935 MountParameters *p;
936
937 assert(m);
938
939 r = unit_fail_if_noncanonical(UNIT(m), m->where);
940 if (r < 0)
941 goto fail;
942
943 (void) mkdir_p_label(m->where, m->directory_mode);
944
945 unit_warn_if_dir_nonempty(UNIT(m), m->where);
946
947 unit_warn_leftover_processes(UNIT(m));
948
949 m->control_command_id = MOUNT_EXEC_MOUNT;
950 m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
951
952 /* Create the source directory for bind-mounts if needed */
953 p = get_mount_parameters_fragment(m);
954 if (p && mount_is_bind(p))
955 (void) mkdir_p_label(p->what, m->directory_mode);
956
957 if (p) {
958 _cleanup_free_ char *opts = NULL;
959
960 r = fstab_filter_options(p->options, "nofail\0" "noauto\0" "auto\0", NULL, NULL, &opts);
961 if (r < 0)
962 goto fail;
963
964 r = exec_command_set(m->control_command, MOUNT_PATH, p->what, m->where, NULL);
965 if (r >= 0 && m->sloppy_options)
966 r = exec_command_append(m->control_command, "-s", NULL);
967 if (r >= 0 && p->fstype)
968 r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
969 if (r >= 0 && !isempty(opts))
970 r = exec_command_append(m->control_command, "-o", opts, NULL);
971 } else
972 r = -ENOENT;
973 if (r < 0)
974 goto fail;
975
976 mount_unwatch_control_pid(m);
977
978 r = mount_spawn(m, m->control_command, &m->control_pid);
979 if (r < 0)
980 goto fail;
981
982 mount_set_state(m, MOUNT_MOUNTING);
983
984 return;
985
986 fail:
987 log_unit_warning_errno(UNIT(m), r, "Failed to run 'mount' task: %m");
988 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
989 }
990
991 static void mount_set_reload_result(Mount *m, MountResult result) {
992 assert(m);
993
994 /* Only store the first error we encounter */
995 if (m->reload_result != MOUNT_SUCCESS)
996 return;
997
998 m->reload_result = result;
999 }
1000
1001 static void mount_enter_remounting(Mount *m) {
1002 int r;
1003 MountParameters *p;
1004
1005 assert(m);
1006
1007 /* Reset reload result when we are about to start a new remount operation */
1008 m->reload_result = MOUNT_SUCCESS;
1009
1010 m->control_command_id = MOUNT_EXEC_REMOUNT;
1011 m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
1012
1013 p = get_mount_parameters_fragment(m);
1014 if (p) {
1015 const char *o;
1016
1017 if (p->options)
1018 o = strjoina("remount,", p->options);
1019 else
1020 o = "remount";
1021
1022 r = exec_command_set(m->control_command, MOUNT_PATH,
1023 p->what, m->where,
1024 "-o", o, NULL);
1025 if (r >= 0 && m->sloppy_options)
1026 r = exec_command_append(m->control_command, "-s", NULL);
1027 if (r >= 0 && p->fstype)
1028 r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
1029 } else
1030 r = -ENOENT;
1031 if (r < 0)
1032 goto fail;
1033
1034 mount_unwatch_control_pid(m);
1035
1036 r = mount_spawn(m, m->control_command, &m->control_pid);
1037 if (r < 0)
1038 goto fail;
1039
1040 mount_set_state(m, MOUNT_REMOUNTING);
1041
1042 return;
1043
1044 fail:
1045 log_unit_warning_errno(UNIT(m), r, "Failed to run 'remount' task: %m");
1046 mount_set_reload_result(m, MOUNT_FAILURE_RESOURCES);
1047 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1048 }
1049
1050 static int mount_start(Unit *u) {
1051 Mount *m = MOUNT(u);
1052 int r;
1053
1054 assert(m);
1055
1056 /* We cannot fulfill this request right now, try again later
1057 * please! */
1058 if (IN_SET(m->state,
1059 MOUNT_UNMOUNTING,
1060 MOUNT_UNMOUNTING_SIGTERM,
1061 MOUNT_UNMOUNTING_SIGKILL))
1062 return -EAGAIN;
1063
1064 /* Already on it! */
1065 if (m->state == MOUNT_MOUNTING)
1066 return 0;
1067
1068 assert(IN_SET(m->state, MOUNT_DEAD, MOUNT_FAILED));
1069
1070 r = unit_start_limit_test(u);
1071 if (r < 0) {
1072 mount_enter_dead(m, MOUNT_FAILURE_START_LIMIT_HIT);
1073 return r;
1074 }
1075
1076 r = unit_acquire_invocation_id(u);
1077 if (r < 0)
1078 return r;
1079
1080 m->result = MOUNT_SUCCESS;
1081 m->reload_result = MOUNT_SUCCESS;
1082
1083 u->reset_accounting = true;
1084
1085 mount_enter_mounting(m);
1086 return 1;
1087 }
1088
1089 static int mount_stop(Unit *u) {
1090 Mount *m = MOUNT(u);
1091
1092 assert(m);
1093
1094 switch (m->state) {
1095
1096 case MOUNT_UNMOUNTING:
1097 case MOUNT_UNMOUNTING_SIGKILL:
1098 case MOUNT_UNMOUNTING_SIGTERM:
1099 /* Already on it */
1100 return 0;
1101
1102 case MOUNT_MOUNTING:
1103 case MOUNT_MOUNTING_DONE:
1104 case MOUNT_REMOUNTING:
1105 /* If we are still waiting for /bin/mount, we go directly into kill mode. */
1106 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_SUCCESS);
1107 return 0;
1108
1109 case MOUNT_REMOUNTING_SIGTERM:
1110 /* If we are already waiting for a hung remount, convert this to the matching unmounting state */
1111 mount_set_state(m, MOUNT_UNMOUNTING_SIGTERM);
1112 return 0;
1113
1114 case MOUNT_REMOUNTING_SIGKILL:
1115 /* as above */
1116 mount_set_state(m, MOUNT_UNMOUNTING_SIGKILL);
1117 return 0;
1118
1119 case MOUNT_MOUNTED:
1120 mount_enter_unmounting(m);
1121 return 1;
1122
1123 default:
1124 assert_not_reached("Unexpected state.");
1125 }
1126 }
1127
1128 static int mount_reload(Unit *u) {
1129 Mount *m = MOUNT(u);
1130
1131 assert(m);
1132 assert(m->state == MOUNT_MOUNTED);
1133
1134 mount_enter_remounting(m);
1135
1136 return 1;
1137 }
1138
1139 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
1140 Mount *m = MOUNT(u);
1141
1142 assert(m);
1143 assert(f);
1144 assert(fds);
1145
1146 unit_serialize_item(u, f, "state", mount_state_to_string(m->state));
1147 unit_serialize_item(u, f, "result", mount_result_to_string(m->result));
1148 unit_serialize_item(u, f, "reload-result", mount_result_to_string(m->reload_result));
1149
1150 if (m->control_pid > 0)
1151 unit_serialize_item_format(u, f, "control-pid", PID_FMT, m->control_pid);
1152
1153 if (m->control_command_id >= 0)
1154 unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id));
1155
1156 return 0;
1157 }
1158
1159 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1160 Mount *m = MOUNT(u);
1161
1162 assert(u);
1163 assert(key);
1164 assert(value);
1165 assert(fds);
1166
1167 if (streq(key, "state")) {
1168 MountState state;
1169
1170 if ((state = mount_state_from_string(value)) < 0)
1171 log_unit_debug(u, "Failed to parse state value: %s", value);
1172 else
1173 m->deserialized_state = state;
1174 } else if (streq(key, "result")) {
1175 MountResult f;
1176
1177 f = mount_result_from_string(value);
1178 if (f < 0)
1179 log_unit_debug(u, "Failed to parse result value: %s", value);
1180 else if (f != MOUNT_SUCCESS)
1181 m->result = f;
1182
1183 } else if (streq(key, "reload-result")) {
1184 MountResult f;
1185
1186 f = mount_result_from_string(value);
1187 if (f < 0)
1188 log_unit_debug(u, "Failed to parse reload result value: %s", value);
1189 else if (f != MOUNT_SUCCESS)
1190 m->reload_result = f;
1191
1192 } else if (streq(key, "control-pid")) {
1193 pid_t pid;
1194
1195 if (parse_pid(value, &pid) < 0)
1196 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
1197 else
1198 m->control_pid = pid;
1199 } else if (streq(key, "control-command")) {
1200 MountExecCommand id;
1201
1202 id = mount_exec_command_from_string(value);
1203 if (id < 0)
1204 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
1205 else {
1206 m->control_command_id = id;
1207 m->control_command = m->exec_command + id;
1208 }
1209 } else
1210 log_unit_debug(u, "Unknown serialization key: %s", key);
1211
1212 return 0;
1213 }
1214
1215 _pure_ static UnitActiveState mount_active_state(Unit *u) {
1216 assert(u);
1217
1218 return state_translation_table[MOUNT(u)->state];
1219 }
1220
1221 _pure_ static const char *mount_sub_state_to_string(Unit *u) {
1222 assert(u);
1223
1224 return mount_state_to_string(MOUNT(u)->state);
1225 }
1226
1227 _pure_ static bool mount_may_gc(Unit *u) {
1228 Mount *m = MOUNT(u);
1229
1230 assert(m);
1231
1232 if (m->from_proc_self_mountinfo)
1233 return false;
1234
1235 return true;
1236 }
1237
1238 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1239 Mount *m = MOUNT(u);
1240 MountResult f;
1241
1242 assert(m);
1243 assert(pid >= 0);
1244
1245 if (pid != m->control_pid)
1246 return;
1247
1248 m->control_pid = 0;
1249
1250 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
1251 f = MOUNT_SUCCESS;
1252 else if (code == CLD_EXITED)
1253 f = MOUNT_FAILURE_EXIT_CODE;
1254 else if (code == CLD_KILLED)
1255 f = MOUNT_FAILURE_SIGNAL;
1256 else if (code == CLD_DUMPED)
1257 f = MOUNT_FAILURE_CORE_DUMP;
1258 else
1259 assert_not_reached("Unknown code");
1260
1261 if (IN_SET(m->state, MOUNT_REMOUNTING, MOUNT_REMOUNTING_SIGKILL, MOUNT_REMOUNTING_SIGTERM))
1262 mount_set_reload_result(m, f);
1263 else if (m->result == MOUNT_SUCCESS)
1264 m->result = f;
1265
1266 if (m->control_command) {
1267 exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status);
1268
1269 m->control_command = NULL;
1270 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1271 }
1272
1273 log_unit_full(u, f == MOUNT_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0,
1274 "Mount process exited, code=%s status=%i", sigchld_code_to_string(code), status);
1275
1276 /* Note that due to the io event priority logic, we can be sure the new mountinfo is loaded
1277 * before we process the SIGCHLD for the mount command. */
1278
1279 switch (m->state) {
1280
1281 case MOUNT_MOUNTING:
1282 /* Our mount point has not appeared in mountinfo. Something went wrong. */
1283
1284 if (f == MOUNT_SUCCESS) {
1285 /* Either /bin/mount has an unexpected definition of success,
1286 * or someone raced us and we lost. */
1287 log_unit_warning(UNIT(m), "Mount process finished, but there is no mount.");
1288 f = MOUNT_FAILURE_PROTOCOL;
1289 }
1290 mount_enter_dead(m, f);
1291 break;
1292
1293 case MOUNT_MOUNTING_DONE:
1294 mount_enter_mounted(m, f);
1295 break;
1296
1297 case MOUNT_REMOUNTING:
1298 case MOUNT_REMOUNTING_SIGTERM:
1299 case MOUNT_REMOUNTING_SIGKILL:
1300 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1301 break;
1302
1303 case MOUNT_UNMOUNTING:
1304
1305 if (f == MOUNT_SUCCESS && m->from_proc_self_mountinfo) {
1306
1307 /* Still a mount point? If so, let's try again. Most likely there were multiple mount points
1308 * stacked on top of each other. We might exceed the timeout specified by the user overall,
1309 * but we will stop as soon as any one umount times out. */
1310
1311 if (m->n_retry_umount < RETRY_UMOUNT_MAX) {
1312 log_unit_debug(u, "Mount still present, trying again.");
1313 m->n_retry_umount++;
1314 mount_enter_unmounting(m);
1315 } else {
1316 log_unit_warning(u, "Mount still present after %u attempts to unmount, giving up.", m->n_retry_umount);
1317 mount_enter_mounted(m, f);
1318 }
1319 } else
1320 mount_enter_dead_or_mounted(m, f);
1321
1322 break;
1323
1324 case MOUNT_UNMOUNTING_SIGKILL:
1325 case MOUNT_UNMOUNTING_SIGTERM:
1326 mount_enter_dead_or_mounted(m, f);
1327 break;
1328
1329 default:
1330 assert_not_reached("Uh, control process died at wrong time.");
1331 }
1332
1333 /* Notify clients about changed exit status */
1334 unit_add_to_dbus_queue(u);
1335 }
1336
1337 static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
1338 Mount *m = MOUNT(userdata);
1339
1340 assert(m);
1341 assert(m->timer_event_source == source);
1342
1343 switch (m->state) {
1344
1345 case MOUNT_MOUNTING:
1346 case MOUNT_MOUNTING_DONE:
1347 log_unit_warning(UNIT(m), "Mounting timed out. Terminating.");
1348 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1349 break;
1350
1351 case MOUNT_REMOUNTING:
1352 log_unit_warning(UNIT(m), "Remounting timed out. Terminating remount process.");
1353 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1354 mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, MOUNT_SUCCESS);
1355 break;
1356
1357 case MOUNT_REMOUNTING_SIGTERM:
1358 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1359
1360 if (m->kill_context.send_sigkill) {
1361 log_unit_warning(UNIT(m), "Remounting timed out. Killing.");
1362 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
1363 } else {
1364 log_unit_warning(UNIT(m), "Remounting timed out. Skipping SIGKILL. Ignoring.");
1365 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1366 }
1367 break;
1368
1369 case MOUNT_REMOUNTING_SIGKILL:
1370 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1371
1372 log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
1373 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1374 break;
1375
1376 case MOUNT_UNMOUNTING:
1377 log_unit_warning(UNIT(m), "Unmounting timed out. Terminating.");
1378 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1379 break;
1380
1381 case MOUNT_UNMOUNTING_SIGTERM:
1382 if (m->kill_context.send_sigkill) {
1383 log_unit_warning(UNIT(m), "Mount process timed out. Killing.");
1384 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
1385 } else {
1386 log_unit_warning(UNIT(m), "Mount process timed out. Skipping SIGKILL. Ignoring.");
1387 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
1388 }
1389 break;
1390
1391 case MOUNT_UNMOUNTING_SIGKILL:
1392 log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
1393 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
1394 break;
1395
1396 default:
1397 assert_not_reached("Timeout at wrong time.");
1398 }
1399
1400 return 0;
1401 }
1402
1403 typedef struct {
1404 bool is_mounted;
1405 bool just_mounted;
1406 bool just_changed;
1407 } MountSetupFlags;
1408
1409 static int mount_setup_new_unit(
1410 Unit *u,
1411 const char *what,
1412 const char *where,
1413 const char *options,
1414 const char *fstype,
1415 MountSetupFlags *flags) {
1416
1417 MountParameters *p;
1418
1419 assert(u);
1420 assert(flags);
1421
1422 u->source_path = strdup("/proc/self/mountinfo");
1423 MOUNT(u)->where = strdup(where);
1424 if (!u->source_path || !MOUNT(u)->where)
1425 return -ENOMEM;
1426
1427 /* Make sure to initialize those fields before mount_is_extrinsic(). */
1428 MOUNT(u)->from_proc_self_mountinfo = true;
1429 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1430
1431 p->what = strdup(what);
1432 p->options = strdup(options);
1433 p->fstype = strdup(fstype);
1434 if (!p->what || !p->options || !p->fstype)
1435 return -ENOMEM;
1436
1437 if (!mount_is_extrinsic(MOUNT(u))) {
1438 const char *target;
1439 int r;
1440
1441 target = mount_is_network(p) ? SPECIAL_REMOTE_FS_TARGET : SPECIAL_LOCAL_FS_TARGET;
1442 r = unit_add_dependency_by_name(u, UNIT_BEFORE, target, NULL, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
1443 if (r < 0)
1444 return r;
1445
1446 r = unit_add_dependency_by_name(u, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
1447 if (r < 0)
1448 return r;
1449 }
1450
1451 unit_add_to_load_queue(u);
1452 flags->is_mounted = true;
1453 flags->just_mounted = true;
1454 flags->just_changed = true;
1455
1456 return 0;
1457 }
1458
1459 static int mount_setup_existing_unit(
1460 Unit *u,
1461 const char *what,
1462 const char *where,
1463 const char *options,
1464 const char *fstype,
1465 MountSetupFlags *flags) {
1466
1467 MountParameters *p;
1468 bool load_extras = false;
1469 int r1, r2, r3;
1470
1471 assert(u);
1472 assert(flags);
1473
1474 if (!MOUNT(u)->where) {
1475 MOUNT(u)->where = strdup(where);
1476 if (!MOUNT(u)->where)
1477 return -ENOMEM;
1478 }
1479
1480 /* Make sure to initialize those fields before mount_is_extrinsic(). */
1481 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1482
1483 r1 = free_and_strdup(&p->what, what);
1484 r2 = free_and_strdup(&p->options, options);
1485 r3 = free_and_strdup(&p->fstype, fstype);
1486 if (r1 < 0 || r2 < 0 || r3 < 0)
1487 return -ENOMEM;
1488
1489 flags->just_changed = r1 > 0 || r2 > 0 || r3 > 0;
1490 flags->is_mounted = true;
1491 flags->just_mounted = !MOUNT(u)->from_proc_self_mountinfo || MOUNT(u)->just_mounted;
1492
1493 MOUNT(u)->from_proc_self_mountinfo = true;
1494
1495 if (!mount_is_extrinsic(MOUNT(u)) && mount_is_network(p)) {
1496 /* _netdev option may have shown up late, or on a
1497 * remount. Add remote-fs dependencies, even though
1498 * local-fs ones may already be there.
1499 *
1500 * Note: due to a current limitation (we don't track
1501 * in the dependency "Set*" objects who created a
1502 * dependency), we can only add deps, never lose them,
1503 * until the next full daemon-reload. */
1504 unit_add_dependency_by_name(u, UNIT_BEFORE, SPECIAL_REMOTE_FS_TARGET, NULL, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
1505 load_extras = true;
1506 }
1507
1508 if (u->load_state == UNIT_NOT_FOUND) {
1509 u->load_state = UNIT_LOADED;
1510 u->load_error = 0;
1511
1512 /* Load in the extras later on, after we
1513 * finished initialization of the unit */
1514
1515 /* FIXME: since we're going to load the unit later on, why setting load_extras=true ? */
1516 load_extras = true;
1517 flags->just_changed = true;
1518 }
1519
1520 if (load_extras)
1521 return mount_add_extras(MOUNT(u));
1522
1523 return 0;
1524 }
1525
1526 static int mount_setup_unit(
1527 Manager *m,
1528 const char *what,
1529 const char *where,
1530 const char *options,
1531 const char *fstype,
1532 bool set_flags) {
1533
1534 _cleanup_free_ char *e = NULL;
1535 MountSetupFlags flags;
1536 Unit *u;
1537 int r;
1538
1539 assert(m);
1540 assert(what);
1541 assert(where);
1542 assert(options);
1543 assert(fstype);
1544
1545 /* Ignore API mount points. They should never be referenced in
1546 * dependencies ever. */
1547 if (mount_point_is_api(where) || mount_point_ignore(where))
1548 return 0;
1549
1550 if (streq(fstype, "autofs"))
1551 return 0;
1552
1553 /* probably some kind of swap, ignore */
1554 if (!is_path(where))
1555 return 0;
1556
1557 r = unit_name_from_path(where, ".mount", &e);
1558 if (r < 0)
1559 return r;
1560
1561 u = manager_get_unit(m, e);
1562 if (!u) {
1563 /* First time we see this mount point meaning that it's
1564 * not been initiated by a mount unit but rather by the
1565 * sysadmin having called mount(8) directly. */
1566 r = unit_new_for_name(m, sizeof(Mount), e, &u);
1567 if (r < 0)
1568 goto fail;
1569
1570 r = mount_setup_new_unit(u, what, where, options, fstype, &flags);
1571 if (r < 0)
1572 unit_free(u);
1573 } else
1574 r = mount_setup_existing_unit(u, what, where, options, fstype, &flags);
1575
1576 if (r < 0)
1577 goto fail;
1578
1579 if (set_flags) {
1580 MOUNT(u)->is_mounted = flags.is_mounted;
1581 MOUNT(u)->just_mounted = flags.just_mounted;
1582 MOUNT(u)->just_changed = flags.just_changed;
1583 }
1584
1585 if (flags.just_changed)
1586 unit_add_to_dbus_queue(u);
1587
1588 return 0;
1589 fail:
1590 log_warning_errno(r, "Failed to set up mount unit: %m");
1591 return r;
1592 }
1593
1594 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1595 _cleanup_(mnt_free_tablep) struct libmnt_table *t = NULL;
1596 _cleanup_(mnt_free_iterp) struct libmnt_iter *i = NULL;
1597 int r = 0;
1598
1599 assert(m);
1600
1601 t = mnt_new_table();
1602 i = mnt_new_iter(MNT_ITER_FORWARD);
1603 if (!t || !i)
1604 return log_oom();
1605
1606 r = mnt_table_parse_mtab(t, NULL);
1607 if (r < 0)
1608 return log_error_errno(r, "Failed to parse /proc/self/mountinfo: %m");
1609
1610 r = 0;
1611 for (;;) {
1612 struct libmnt_fs *fs;
1613 const char *device, *path, *options, *fstype;
1614 _cleanup_free_ char *d = NULL, *p = NULL;
1615 int k;
1616
1617 k = mnt_table_next_fs(t, i, &fs);
1618 if (k == 1)
1619 break;
1620 if (k < 0)
1621 return log_error_errno(k, "Failed to get next entry from /proc/self/mountinfo: %m");
1622
1623 device = mnt_fs_get_source(fs);
1624 path = mnt_fs_get_target(fs);
1625 options = mnt_fs_get_options(fs);
1626 fstype = mnt_fs_get_fstype(fs);
1627
1628 if (!device || !path)
1629 continue;
1630
1631 if (cunescape(device, UNESCAPE_RELAX, &d) < 0)
1632 return log_oom();
1633
1634 if (cunescape(path, UNESCAPE_RELAX, &p) < 0)
1635 return log_oom();
1636
1637 (void) device_found_node(m, d, true, DEVICE_FOUND_MOUNT, set_flags);
1638
1639 k = mount_setup_unit(m, d, p, options, fstype, set_flags);
1640 if (r == 0 && k < 0)
1641 r = k;
1642 }
1643
1644 return r;
1645 }
1646
1647 static void mount_shutdown(Manager *m) {
1648 assert(m);
1649
1650 m->mount_event_source = sd_event_source_unref(m->mount_event_source);
1651
1652 mnt_unref_monitor(m->mount_monitor);
1653 m->mount_monitor = NULL;
1654 }
1655
1656 static int mount_get_timeout(Unit *u, usec_t *timeout) {
1657 Mount *m = MOUNT(u);
1658 usec_t t;
1659 int r;
1660
1661 if (!m->timer_event_source)
1662 return 0;
1663
1664 r = sd_event_source_get_time(m->timer_event_source, &t);
1665 if (r < 0)
1666 return r;
1667 if (t == USEC_INFINITY)
1668 return 0;
1669
1670 *timeout = t;
1671 return 1;
1672 }
1673
1674 static int synthesize_root_mount(Manager *m) {
1675 Unit *u;
1676 int r;
1677
1678 assert(m);
1679
1680 /* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's
1681 * unconditionally synthesize it here and mark it as perpetual. */
1682
1683 u = manager_get_unit(m, SPECIAL_ROOT_MOUNT);
1684 if (!u) {
1685 r = unit_new_for_name(m, sizeof(Mount), SPECIAL_ROOT_MOUNT, &u);
1686 if (r < 0)
1687 return log_error_errno(r, "Failed to allocate the special " SPECIAL_ROOT_MOUNT " unit: %m");
1688 }
1689
1690 u->perpetual = true;
1691 MOUNT(u)->deserialized_state = MOUNT_MOUNTED;
1692
1693 unit_add_to_load_queue(u);
1694 unit_add_to_dbus_queue(u);
1695
1696 return 0;
1697 }
1698
1699 static bool mount_is_mounted(Mount *m) {
1700 assert(m);
1701
1702 return UNIT(m)->perpetual || m->is_mounted;
1703 }
1704
1705 static void mount_enumerate(Manager *m) {
1706 int r;
1707
1708 assert(m);
1709
1710 r = synthesize_root_mount(m);
1711 if (r < 0)
1712 goto fail;
1713
1714 mnt_init_debug(0);
1715
1716 if (!m->mount_monitor) {
1717 int fd;
1718
1719 m->mount_monitor = mnt_new_monitor();
1720 if (!m->mount_monitor) {
1721 log_oom();
1722 goto fail;
1723 }
1724
1725 r = mnt_monitor_enable_kernel(m->mount_monitor, 1);
1726 if (r < 0) {
1727 log_error_errno(r, "Failed to enable watching of kernel mount events: %m");
1728 goto fail;
1729 }
1730
1731 r = mnt_monitor_enable_userspace(m->mount_monitor, 1, NULL);
1732 if (r < 0) {
1733 log_error_errno(r, "Failed to enable watching of userspace mount events: %m");
1734 goto fail;
1735 }
1736
1737 /* mnt_unref_monitor() will close the fd */
1738 fd = r = mnt_monitor_get_fd(m->mount_monitor);
1739 if (r < 0) {
1740 log_error_errno(r, "Failed to acquire watch file descriptor: %m");
1741 goto fail;
1742 }
1743
1744 r = sd_event_add_io(m->event, &m->mount_event_source, fd, EPOLLIN, mount_dispatch_io, m);
1745 if (r < 0) {
1746 log_error_errno(r, "Failed to watch mount file descriptor: %m");
1747 goto fail;
1748 }
1749
1750 r = sd_event_source_set_priority(m->mount_event_source, SD_EVENT_PRIORITY_NORMAL-10);
1751 if (r < 0) {
1752 log_error_errno(r, "Failed to adjust mount watch priority: %m");
1753 goto fail;
1754 }
1755
1756 (void) sd_event_source_set_description(m->mount_event_source, "mount-monitor-dispatch");
1757 }
1758
1759 r = mount_load_proc_self_mountinfo(m, false);
1760 if (r < 0)
1761 goto fail;
1762
1763 return;
1764
1765 fail:
1766 mount_shutdown(m);
1767 }
1768
1769 static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
1770 _cleanup_set_free_ Set *around = NULL, *gone = NULL;
1771 Manager *m = userdata;
1772 const char *what;
1773 Iterator i;
1774 Unit *u;
1775 int r;
1776
1777 assert(m);
1778 assert(revents & EPOLLIN);
1779
1780 if (fd == mnt_monitor_get_fd(m->mount_monitor)) {
1781 bool rescan = false;
1782
1783 /* Drain all events and verify that the event is valid.
1784 *
1785 * Note that libmount also monitors /run/mount mkdir if the
1786 * directory does not exist yet. The mkdir may generate event
1787 * which is irrelevant for us.
1788 *
1789 * error: r < 0; valid: r == 0, false positive: rc == 1 */
1790 do {
1791 r = mnt_monitor_next_change(m->mount_monitor, NULL, NULL);
1792 if (r == 0)
1793 rescan = true;
1794 else if (r < 0)
1795 return log_error_errno(r, "Failed to drain libmount events");
1796 } while (r == 0);
1797
1798 log_debug("libmount event [rescan: %s]", yes_no(rescan));
1799 if (!rescan)
1800 return 0;
1801 }
1802
1803 r = mount_load_proc_self_mountinfo(m, true);
1804 if (r < 0) {
1805 /* Reset flags, just in case, for later calls */
1806 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1807 Mount *mount = MOUNT(u);
1808
1809 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1810 }
1811
1812 return 0;
1813 }
1814
1815 manager_dispatch_load_queue(m);
1816
1817 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1818 Mount *mount = MOUNT(u);
1819
1820 if (!mount_is_mounted(mount)) {
1821
1822 /* A mount point is not around right now. It
1823 * might be gone, or might never have
1824 * existed. */
1825
1826 if (mount->from_proc_self_mountinfo &&
1827 mount->parameters_proc_self_mountinfo.what) {
1828
1829 /* Remember that this device might just have disappeared */
1830 if (set_ensure_allocated(&gone, &path_hash_ops) < 0 ||
1831 set_put(gone, mount->parameters_proc_self_mountinfo.what) < 0)
1832 log_oom(); /* we don't care too much about OOM here... */
1833 }
1834
1835 mount->from_proc_self_mountinfo = false;
1836
1837 switch (mount->state) {
1838
1839 case MOUNT_MOUNTED:
1840 /* This has just been unmounted by
1841 * somebody else, follow the state
1842 * change. */
1843 mount->result = MOUNT_SUCCESS; /* make sure we forget any earlier umount failures */
1844 mount_enter_dead(mount, MOUNT_SUCCESS);
1845 break;
1846
1847 default:
1848 break;
1849 }
1850
1851 } else if (mount->just_mounted || mount->just_changed) {
1852
1853 /* A mount point was added or changed */
1854
1855 switch (mount->state) {
1856
1857 case MOUNT_DEAD:
1858 case MOUNT_FAILED:
1859
1860 /* This has just been mounted by somebody else, follow the state change, but let's
1861 * generate a new invocation ID for this implicitly and automatically. */
1862 (void) unit_acquire_invocation_id(UNIT(mount));
1863 mount_enter_mounted(mount, MOUNT_SUCCESS);
1864 break;
1865
1866 case MOUNT_MOUNTING:
1867 mount_set_state(mount, MOUNT_MOUNTING_DONE);
1868 break;
1869
1870 default:
1871 /* Nothing really changed, but let's
1872 * issue an notification call
1873 * nonetheless, in case somebody is
1874 * waiting for this. (e.g. file system
1875 * ro/rw remounts.) */
1876 mount_set_state(mount, mount->state);
1877 break;
1878 }
1879 }
1880
1881 if (mount_is_mounted(mount) &&
1882 mount->from_proc_self_mountinfo &&
1883 mount->parameters_proc_self_mountinfo.what) {
1884
1885 if (set_ensure_allocated(&around, &path_hash_ops) < 0 ||
1886 set_put(around, mount->parameters_proc_self_mountinfo.what) < 0)
1887 log_oom();
1888 }
1889
1890 /* Reset the flags for later calls */
1891 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1892 }
1893
1894 SET_FOREACH(what, gone, i) {
1895 if (set_contains(around, what))
1896 continue;
1897
1898 /* Let the device units know that the device is no longer mounted */
1899 (void) device_found_node(m, what, false, DEVICE_FOUND_MOUNT, true);
1900 }
1901
1902 return 0;
1903 }
1904
1905 static void mount_reset_failed(Unit *u) {
1906 Mount *m = MOUNT(u);
1907
1908 assert(m);
1909
1910 if (m->state == MOUNT_FAILED)
1911 mount_set_state(m, MOUNT_DEAD);
1912
1913 m->result = MOUNT_SUCCESS;
1914 m->reload_result = MOUNT_SUCCESS;
1915 }
1916
1917 static int mount_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
1918 Mount *m = MOUNT(u);
1919
1920 assert(m);
1921
1922 return unit_kill_common(u, who, signo, -1, MOUNT(u)->control_pid, error);
1923 }
1924
1925 static int mount_control_pid(Unit *u) {
1926 Mount *m = MOUNT(u);
1927
1928 assert(m);
1929
1930 return m->control_pid;
1931 }
1932
1933 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1934 [MOUNT_EXEC_MOUNT] = "ExecMount",
1935 [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1936 [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1937 };
1938
1939 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1940
1941 static const char* const mount_result_table[_MOUNT_RESULT_MAX] = {
1942 [MOUNT_SUCCESS] = "success",
1943 [MOUNT_FAILURE_RESOURCES] = "resources",
1944 [MOUNT_FAILURE_TIMEOUT] = "timeout",
1945 [MOUNT_FAILURE_EXIT_CODE] = "exit-code",
1946 [MOUNT_FAILURE_SIGNAL] = "signal",
1947 [MOUNT_FAILURE_CORE_DUMP] = "core-dump",
1948 [MOUNT_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
1949 [MOUNT_FAILURE_PROTOCOL] = "protocol",
1950 };
1951
1952 DEFINE_STRING_TABLE_LOOKUP(mount_result, MountResult);
1953
1954 const UnitVTable mount_vtable = {
1955 .object_size = sizeof(Mount),
1956 .exec_context_offset = offsetof(Mount, exec_context),
1957 .cgroup_context_offset = offsetof(Mount, cgroup_context),
1958 .kill_context_offset = offsetof(Mount, kill_context),
1959 .exec_runtime_offset = offsetof(Mount, exec_runtime),
1960 .dynamic_creds_offset = offsetof(Mount, dynamic_creds),
1961
1962 .sections =
1963 "Unit\0"
1964 "Mount\0"
1965 "Install\0",
1966 .private_section = "Mount",
1967
1968 .init = mount_init,
1969 .load = mount_load,
1970 .done = mount_done,
1971
1972 .coldplug = mount_coldplug,
1973
1974 .dump = mount_dump,
1975
1976 .start = mount_start,
1977 .stop = mount_stop,
1978 .reload = mount_reload,
1979
1980 .kill = mount_kill,
1981
1982 .serialize = mount_serialize,
1983 .deserialize_item = mount_deserialize_item,
1984
1985 .active_state = mount_active_state,
1986 .sub_state_to_string = mount_sub_state_to_string,
1987
1988 .may_gc = mount_may_gc,
1989
1990 .sigchld_event = mount_sigchld_event,
1991
1992 .reset_failed = mount_reset_failed,
1993
1994 .control_pid = mount_control_pid,
1995
1996 .bus_vtable = bus_mount_vtable,
1997 .bus_set_property = bus_mount_set_property,
1998 .bus_commit_properties = bus_mount_commit_properties,
1999
2000 .get_timeout = mount_get_timeout,
2001
2002 .can_transient = true,
2003
2004 .enumerate = mount_enumerate,
2005 .shutdown = mount_shutdown,
2006
2007 .status_message_formats = {
2008 .starting_stopping = {
2009 [0] = "Mounting %s...",
2010 [1] = "Unmounting %s...",
2011 },
2012 .finished_start_job = {
2013 [JOB_DONE] = "Mounted %s.",
2014 [JOB_FAILED] = "Failed to mount %s.",
2015 [JOB_TIMEOUT] = "Timed out mounting %s.",
2016 },
2017 .finished_stop_job = {
2018 [JOB_DONE] = "Unmounted %s.",
2019 [JOB_FAILED] = "Failed unmounting %s.",
2020 [JOB_TIMEOUT] = "Timed out unmounting %s.",
2021 },
2022 },
2023 };
Unnamed repository; edit this file 'description' to name the repository.