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