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Merge pull request #6741 from keszybz/template-loading-fix
[thirdparty/systemd.git] / src / core / mount.c
1 /***
2 This file is part of systemd.
3
4 Copyright 2010 Lennart Poettering
5
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
10
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
18 ***/
19
20 #include <errno.h>
21 #include <signal.h>
22 #include <stdio.h>
23 #include <sys/epoll.h>
24
25 #include "sd-messages.h"
26
27 #include "alloc-util.h"
28 #include "dbus-mount.h"
29 #include "escape.h"
30 #include "exit-status.h"
31 #include "format-util.h"
32 #include "fstab-util.h"
33 #include "log.h"
34 #include "manager.h"
35 #include "mkdir.h"
36 #include "mount-setup.h"
37 #include "mount-util.h"
38 #include "mount.h"
39 #include "parse-util.h"
40 #include "path-util.h"
41 #include "process-util.h"
42 #include "special.h"
43 #include "string-table.h"
44 #include "string-util.h"
45 #include "strv.h"
46 #include "unit-name.h"
47 #include "unit.h"
48
49 #define RETRY_UMOUNT_MAX 32
50
51 DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_table*, mnt_free_table);
52 DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_iter*, mnt_free_iter);
53
54 static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
55 [MOUNT_DEAD] = UNIT_INACTIVE,
56 [MOUNT_MOUNTING] = UNIT_ACTIVATING,
57 [MOUNT_MOUNTING_DONE] = UNIT_ACTIVE,
58 [MOUNT_MOUNTED] = UNIT_ACTIVE,
59 [MOUNT_REMOUNTING] = UNIT_RELOADING,
60 [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
61 [MOUNT_MOUNTING_SIGTERM] = UNIT_DEACTIVATING,
62 [MOUNT_MOUNTING_SIGKILL] = UNIT_DEACTIVATING,
63 [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING,
64 [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING,
65 [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
66 [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
67 [MOUNT_FAILED] = UNIT_FAILED
68 };
69
70 static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
71 static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
72
73 static bool mount_needs_network(const char *options, const char *fstype) {
74 if (fstab_test_option(options, "_netdev\0"))
75 return true;
76
77 if (fstype && fstype_is_network(fstype))
78 return true;
79
80 return false;
81 }
82
83 static bool mount_is_network(const MountParameters *p) {
84 assert(p);
85
86 return mount_needs_network(p->options, p->fstype);
87 }
88
89 static bool mount_is_loop(const MountParameters *p) {
90 assert(p);
91
92 if (fstab_test_option(p->options, "loop\0"))
93 return true;
94
95 return false;
96 }
97
98 static bool mount_is_bind(const MountParameters *p) {
99 assert(p);
100
101 if (fstab_test_option(p->options, "bind\0" "rbind\0"))
102 return true;
103
104 if (p->fstype && STR_IN_SET(p->fstype, "bind", "rbind"))
105 return true;
106
107 return false;
108 }
109
110 static bool mount_is_auto(const MountParameters *p) {
111 assert(p);
112
113 return !fstab_test_option(p->options, "noauto\0");
114 }
115
116 static bool mount_is_automount(const MountParameters *p) {
117 assert(p);
118
119 return fstab_test_option(p->options,
120 "comment=systemd.automount\0"
121 "x-systemd.automount\0");
122 }
123
124 static bool mount_state_active(MountState state) {
125 return IN_SET(state,
126 MOUNT_MOUNTING,
127 MOUNT_MOUNTING_DONE,
128 MOUNT_REMOUNTING,
129 MOUNT_UNMOUNTING,
130 MOUNT_MOUNTING_SIGTERM,
131 MOUNT_MOUNTING_SIGKILL,
132 MOUNT_UNMOUNTING_SIGTERM,
133 MOUNT_UNMOUNTING_SIGKILL,
134 MOUNT_REMOUNTING_SIGTERM,
135 MOUNT_REMOUNTING_SIGKILL);
136 }
137
138 static bool mount_is_bound_to_device(const Mount *m) {
139 const MountParameters *p;
140
141 if (m->from_fragment)
142 return true;
143
144 p = &m->parameters_proc_self_mountinfo;
145 return fstab_test_option(p->options, "x-systemd.device-bound\0");
146 }
147
148 static bool needs_quota(const MountParameters *p) {
149 assert(p);
150
151 /* Quotas are not enabled on network filesystems,
152 * but we want them, for example, on storage connected via iscsi */
153 if (p->fstype && fstype_is_network(p->fstype))
154 return false;
155
156 if (mount_is_bind(p))
157 return false;
158
159 return fstab_test_option(p->options,
160 "usrquota\0" "grpquota\0" "quota\0" "usrjquota\0" "grpjquota\0");
161 }
162
163 static void mount_init(Unit *u) {
164 Mount *m = MOUNT(u);
165
166 assert(u);
167 assert(u->load_state == UNIT_STUB);
168
169 m->timeout_usec = u->manager->default_timeout_start_usec;
170 m->directory_mode = 0755;
171
172 /* We need to make sure that /usr/bin/mount is always called
173 * in the same process group as us, so that the autofs kernel
174 * side doesn't send us another mount request while we are
175 * already trying to comply its last one. */
176 m->exec_context.same_pgrp = true;
177
178 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
179
180 u->ignore_on_isolate = true;
181 }
182
183 static int mount_arm_timer(Mount *m, usec_t usec) {
184 int r;
185
186 assert(m);
187
188 if (m->timer_event_source) {
189 r = sd_event_source_set_time(m->timer_event_source, usec);
190 if (r < 0)
191 return r;
192
193 return sd_event_source_set_enabled(m->timer_event_source, SD_EVENT_ONESHOT);
194 }
195
196 if (usec == USEC_INFINITY)
197 return 0;
198
199 r = sd_event_add_time(
200 UNIT(m)->manager->event,
201 &m->timer_event_source,
202 CLOCK_MONOTONIC,
203 usec, 0,
204 mount_dispatch_timer, m);
205 if (r < 0)
206 return r;
207
208 (void) sd_event_source_set_description(m->timer_event_source, "mount-timer");
209
210 return 0;
211 }
212
213 static void mount_unwatch_control_pid(Mount *m) {
214 assert(m);
215
216 if (m->control_pid <= 0)
217 return;
218
219 unit_unwatch_pid(UNIT(m), m->control_pid);
220 m->control_pid = 0;
221 }
222
223 static void mount_parameters_done(MountParameters *p) {
224 assert(p);
225
226 free(p->what);
227 free(p->options);
228 free(p->fstype);
229
230 p->what = p->options = p->fstype = NULL;
231 }
232
233 static void mount_done(Unit *u) {
234 Mount *m = MOUNT(u);
235
236 assert(m);
237
238 m->where = mfree(m->where);
239
240 mount_parameters_done(&m->parameters_proc_self_mountinfo);
241 mount_parameters_done(&m->parameters_fragment);
242
243 m->exec_runtime = exec_runtime_unref(m->exec_runtime);
244 exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
245 m->control_command = NULL;
246
247 dynamic_creds_unref(&m->dynamic_creds);
248
249 mount_unwatch_control_pid(m);
250
251 m->timer_event_source = sd_event_source_unref(m->timer_event_source);
252 }
253
254 _pure_ static MountParameters* get_mount_parameters_fragment(Mount *m) {
255 assert(m);
256
257 if (m->from_fragment)
258 return &m->parameters_fragment;
259
260 return NULL;
261 }
262
263 _pure_ static MountParameters* get_mount_parameters(Mount *m) {
264 assert(m);
265
266 if (m->from_proc_self_mountinfo)
267 return &m->parameters_proc_self_mountinfo;
268
269 return get_mount_parameters_fragment(m);
270 }
271
272 static int mount_add_mount_links(Mount *m) {
273 _cleanup_free_ char *parent = NULL;
274 MountParameters *pm;
275 Unit *other;
276 Iterator i;
277 Set *s;
278 int r;
279
280 assert(m);
281
282 if (!path_equal(m->where, "/")) {
283 /* Adds in links to other mount points that might lie further
284 * up in the hierarchy */
285
286 parent = dirname_malloc(m->where);
287 if (!parent)
288 return -ENOMEM;
289
290 r = unit_require_mounts_for(UNIT(m), parent);
291 if (r < 0)
292 return r;
293 }
294
295 /* Adds in links to other mount points that might be needed
296 * for the source path (if this is a bind mount or a loop mount) to be
297 * available. */
298 pm = get_mount_parameters_fragment(m);
299 if (pm && pm->what &&
300 path_is_absolute(pm->what) &&
301 (mount_is_bind(pm) || mount_is_loop(pm) || !mount_is_network(pm))) {
302
303 r = unit_require_mounts_for(UNIT(m), pm->what);
304 if (r < 0)
305 return r;
306 }
307
308 /* Adds in links to other units that use this path or paths
309 * further down in the hierarchy */
310 s = manager_get_units_requiring_mounts_for(UNIT(m)->manager, m->where);
311 SET_FOREACH(other, s, i) {
312
313 if (other->load_state != UNIT_LOADED)
314 continue;
315
316 if (other == UNIT(m))
317 continue;
318
319 r = unit_add_dependency(other, UNIT_AFTER, UNIT(m), true);
320 if (r < 0)
321 return r;
322
323 if (UNIT(m)->fragment_path) {
324 /* If we have fragment configuration, then make this dependency required */
325 r = unit_add_dependency(other, UNIT_REQUIRES, UNIT(m), true);
326 if (r < 0)
327 return r;
328 }
329 }
330
331 return 0;
332 }
333
334 static int mount_add_device_links(Mount *m) {
335 MountParameters *p;
336 bool device_wants_mount = false;
337 UnitDependency dep;
338 int r;
339
340 assert(m);
341
342 p = get_mount_parameters(m);
343 if (!p)
344 return 0;
345
346 if (!p->what)
347 return 0;
348
349 if (mount_is_bind(p))
350 return 0;
351
352 if (!is_device_path(p->what))
353 return 0;
354
355 /* /dev/root is a really weird thing, it's not a real device,
356 * but just a path the kernel exports for the root file system
357 * specified on the kernel command line. Ignore it here. */
358 if (path_equal(p->what, "/dev/root"))
359 return 0;
360
361 if (path_equal(m->where, "/"))
362 return 0;
363
364 if (mount_is_auto(p) && !mount_is_automount(p) && MANAGER_IS_SYSTEM(UNIT(m)->manager))
365 device_wants_mount = true;
366
367 /* Mount units from /proc/self/mountinfo are not bound to devices
368 * by default since they're subject to races when devices are
369 * unplugged. But the user can still force this dep with an
370 * appropriate option (or udev property) so the mount units are
371 * automatically stopped when the device disappears suddenly. */
372 dep = mount_is_bound_to_device(m) ? UNIT_BINDS_TO : UNIT_REQUIRES;
373
374 r = unit_add_node_link(UNIT(m), p->what, device_wants_mount, dep);
375 if (r < 0)
376 return r;
377
378 return 0;
379 }
380
381 static int mount_add_quota_links(Mount *m) {
382 int r;
383 MountParameters *p;
384
385 assert(m);
386
387 if (!MANAGER_IS_SYSTEM(UNIT(m)->manager))
388 return 0;
389
390 p = get_mount_parameters_fragment(m);
391 if (!p)
392 return 0;
393
394 if (!needs_quota(p))
395 return 0;
396
397 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, NULL, true);
398 if (r < 0)
399 return r;
400
401 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, NULL, true);
402 if (r < 0)
403 return r;
404
405 return 0;
406 }
407
408 static bool mount_is_extrinsic(Mount *m) {
409 MountParameters *p;
410 assert(m);
411
412 /* Returns true for all units that are "magic" and should be excluded from the usual start-up and shutdown
413 * dependencies. We call them "extrinsic" here, as they are generally mounted outside of the systemd dependency
414 * logic. We shouldn't attempt to manage them ourselves but it's fine if the user operates on them with us. */
415
416 if (!MANAGER_IS_SYSTEM(UNIT(m)->manager)) /* We only automatically manage mounts if we are in system mode */
417 return true;
418
419 if (PATH_IN_SET(m->where, /* Don't bother with the OS data itself */
420 "/",
421 "/usr"))
422 return true;
423
424 if (PATH_STARTSWITH_SET(m->where,
425 "/run/initramfs", /* This should stay around from before we boot until after we shutdown */
426 "/proc", /* All of this is API VFS */
427 "/sys", /* … dito … */
428 "/dev")) /* … dito … */
429 return true;
430
431 /* If this is an initrd mount, and we are not in the initrd, then leave this around forever, too. */
432 p = get_mount_parameters(m);
433 if (p && fstab_test_option(p->options, "x-initrd.mount\0") && !in_initrd())
434 return true;
435
436 return false;
437 }
438
439 static int mount_add_default_dependencies(Mount *m) {
440 MountParameters *p;
441 const char *after;
442 int r;
443
444 assert(m);
445
446 if (!UNIT(m)->default_dependencies)
447 return 0;
448
449 /* We do not add any default dependencies to /, /usr or /run/initramfs/, since they are guaranteed to stay
450 * mounted the whole time, since our system is on it. Also, don't bother with anything mounted below virtual
451 * file systems, it's also going to be virtual, and hence not worth the effort. */
452 if (mount_is_extrinsic(m))
453 return 0;
454
455 p = get_mount_parameters(m);
456 if (!p)
457 return 0;
458
459 if (mount_is_network(p)) {
460 /* We order ourselves after network.target. This is
461 * primarily useful at shutdown: services that take
462 * down the network should order themselves before
463 * network.target, so that they are shut down only
464 * after this mount unit is stopped. */
465
466 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_NETWORK_TARGET, NULL, true);
467 if (r < 0)
468 return r;
469
470 /* We pull in network-online.target, and order
471 * ourselves after it. This is useful at start-up to
472 * actively pull in tools that want to be started
473 * before we start mounting network file systems, and
474 * whose purpose it is to delay this until the network
475 * is "up". */
476
477 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_WANTS, UNIT_AFTER, SPECIAL_NETWORK_ONLINE_TARGET, NULL, true);
478 if (r < 0)
479 return r;
480
481 after = SPECIAL_REMOTE_FS_PRE_TARGET;
482 } else
483 after = SPECIAL_LOCAL_FS_PRE_TARGET;
484
485 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, NULL, true);
486 if (r < 0)
487 return r;
488
489 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true);
490 if (r < 0)
491 return r;
492
493 return 0;
494 }
495
496 static int mount_verify(Mount *m) {
497 _cleanup_free_ char *e = NULL;
498 MountParameters *p;
499 int r;
500
501 assert(m);
502
503 if (UNIT(m)->load_state != UNIT_LOADED)
504 return 0;
505
506 if (!m->from_fragment && !m->from_proc_self_mountinfo && !UNIT(m)->perpetual)
507 return -ENOENT;
508
509 r = unit_name_from_path(m->where, ".mount", &e);
510 if (r < 0)
511 return log_unit_error_errno(UNIT(m), r, "Failed to generate unit name from mount path: %m");
512
513 if (!unit_has_name(UNIT(m), e)) {
514 log_unit_error(UNIT(m), "Where= setting doesn't match unit name. Refusing.");
515 return -EINVAL;
516 }
517
518 if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
519 log_unit_error(UNIT(m), "Cannot create mount unit for API file system %s. Refusing.", m->where);
520 return -EINVAL;
521 }
522
523 p = get_mount_parameters_fragment(m);
524 if (p && !p->what) {
525 log_unit_error(UNIT(m), "What= setting is missing. Refusing.");
526 return -EBADMSG;
527 }
528
529 if (m->exec_context.pam_name && m->kill_context.kill_mode != KILL_CONTROL_GROUP) {
530 log_unit_error(UNIT(m), "Unit has PAM enabled. Kill mode must be set to control-group'. Refusing.");
531 return -EINVAL;
532 }
533
534 return 0;
535 }
536
537 static int mount_add_extras(Mount *m) {
538 Unit *u = UNIT(m);
539 int r;
540
541 assert(m);
542
543 if (u->fragment_path)
544 m->from_fragment = true;
545
546 if (!m->where) {
547 r = unit_name_to_path(u->id, &m->where);
548 if (r < 0)
549 return r;
550 }
551
552 path_kill_slashes(m->where);
553
554 if (!u->description) {
555 r = unit_set_description(u, m->where);
556 if (r < 0)
557 return r;
558 }
559
560 r = mount_add_device_links(m);
561 if (r < 0)
562 return r;
563
564 r = mount_add_mount_links(m);
565 if (r < 0)
566 return r;
567
568 r = mount_add_quota_links(m);
569 if (r < 0)
570 return r;
571
572 r = unit_patch_contexts(u);
573 if (r < 0)
574 return r;
575
576 r = unit_add_exec_dependencies(u, &m->exec_context);
577 if (r < 0)
578 return r;
579
580 r = unit_set_default_slice(u);
581 if (r < 0)
582 return r;
583
584 r = mount_add_default_dependencies(m);
585 if (r < 0)
586 return r;
587
588 return 0;
589 }
590
591 static int mount_load_root_mount(Unit *u) {
592 assert(u);
593
594 if (!unit_has_name(u, SPECIAL_ROOT_MOUNT))
595 return 0;
596
597 u->perpetual = true;
598 u->default_dependencies = false;
599
600 /* The stdio/kmsg bridge socket is on /, in order to avoid a dep loop, don't use kmsg logging for -.mount */
601 MOUNT(u)->exec_context.std_output = EXEC_OUTPUT_NULL;
602 MOUNT(u)->exec_context.std_input = EXEC_INPUT_NULL;
603
604 if (!u->description)
605 u->description = strdup("Root Mount");
606
607 return 1;
608 }
609
610 static int mount_load(Unit *u) {
611 Mount *m = MOUNT(u);
612 int r;
613
614 assert(u);
615 assert(u->load_state == UNIT_STUB);
616
617 r = mount_load_root_mount(u);
618 if (r < 0)
619 return r;
620
621 if (m->from_proc_self_mountinfo || u->perpetual)
622 r = unit_load_fragment_and_dropin_optional(u);
623 else
624 r = unit_load_fragment_and_dropin(u);
625 if (r < 0)
626 return r;
627
628 /* This is a new unit? Then let's add in some extras */
629 if (u->load_state == UNIT_LOADED) {
630 r = mount_add_extras(m);
631 if (r < 0)
632 return r;
633 }
634
635 return mount_verify(m);
636 }
637
638 static void mount_set_state(Mount *m, MountState state) {
639 MountState old_state;
640 assert(m);
641
642 old_state = m->state;
643 m->state = state;
644
645 if (!mount_state_active(state)) {
646 m->timer_event_source = sd_event_source_unref(m->timer_event_source);
647 mount_unwatch_control_pid(m);
648 m->control_command = NULL;
649 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
650 }
651
652 if (state != old_state)
653 log_unit_debug(UNIT(m), "Changed %s -> %s", mount_state_to_string(old_state), mount_state_to_string(state));
654
655 unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state], m->reload_result == MOUNT_SUCCESS);
656 m->reload_result = MOUNT_SUCCESS;
657 }
658
659 static int mount_coldplug(Unit *u) {
660 Mount *m = MOUNT(u);
661 MountState new_state = MOUNT_DEAD;
662 int r;
663
664 assert(m);
665 assert(m->state == MOUNT_DEAD);
666
667 if (m->deserialized_state != m->state)
668 new_state = m->deserialized_state;
669 else if (m->from_proc_self_mountinfo)
670 new_state = MOUNT_MOUNTED;
671
672 if (new_state == m->state)
673 return 0;
674
675 if (m->control_pid > 0 &&
676 pid_is_unwaited(m->control_pid) &&
677 mount_state_active(new_state)) {
678
679 r = unit_watch_pid(UNIT(m), m->control_pid);
680 if (r < 0)
681 return r;
682
683 r = mount_arm_timer(m, usec_add(u->state_change_timestamp.monotonic, m->timeout_usec));
684 if (r < 0)
685 return r;
686 }
687
688 if (!IN_SET(new_state, MOUNT_DEAD, MOUNT_FAILED))
689 (void) unit_setup_dynamic_creds(u);
690
691 mount_set_state(m, new_state);
692 return 0;
693 }
694
695 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
696 Mount *m = MOUNT(u);
697 MountParameters *p;
698
699 assert(m);
700 assert(f);
701
702 p = get_mount_parameters(m);
703
704 fprintf(f,
705 "%sMount State: %s\n"
706 "%sResult: %s\n"
707 "%sWhere: %s\n"
708 "%sWhat: %s\n"
709 "%sFile System Type: %s\n"
710 "%sOptions: %s\n"
711 "%sFrom /proc/self/mountinfo: %s\n"
712 "%sFrom fragment: %s\n"
713 "%sExtrinsic: %s\n"
714 "%sDirectoryMode: %04o\n"
715 "%sSloppyOptions: %s\n"
716 "%sLazyUnmount: %s\n"
717 "%sForceUnmount: %s\n",
718 prefix, mount_state_to_string(m->state),
719 prefix, mount_result_to_string(m->result),
720 prefix, m->where,
721 prefix, p ? strna(p->what) : "n/a",
722 prefix, p ? strna(p->fstype) : "n/a",
723 prefix, p ? strna(p->options) : "n/a",
724 prefix, yes_no(m->from_proc_self_mountinfo),
725 prefix, yes_no(m->from_fragment),
726 prefix, yes_no(mount_is_extrinsic(m)),
727 prefix, m->directory_mode,
728 prefix, yes_no(m->sloppy_options),
729 prefix, yes_no(m->lazy_unmount),
730 prefix, yes_no(m->force_unmount));
731
732 if (m->control_pid > 0)
733 fprintf(f,
734 "%sControl PID: "PID_FMT"\n",
735 prefix, m->control_pid);
736
737 exec_context_dump(&m->exec_context, f, prefix);
738 kill_context_dump(&m->kill_context, f, prefix);
739 }
740
741 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
742 pid_t pid;
743 int r;
744 ExecParameters exec_params = {
745 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
746 .stdin_fd = -1,
747 .stdout_fd = -1,
748 .stderr_fd = -1,
749 };
750
751 assert(m);
752 assert(c);
753 assert(_pid);
754
755 (void) unit_realize_cgroup(UNIT(m));
756 if (m->reset_cpu_usage) {
757 (void) unit_reset_cpu_usage(UNIT(m));
758 m->reset_cpu_usage = false;
759 }
760
761 r = unit_setup_exec_runtime(UNIT(m));
762 if (r < 0)
763 return r;
764
765 r = unit_setup_dynamic_creds(UNIT(m));
766 if (r < 0)
767 return r;
768
769 r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
770 if (r < 0)
771 return r;
772
773 manager_set_exec_params(UNIT(m)->manager, &exec_params);
774 unit_set_exec_params(UNIT(m), &exec_params);
775
776 r = exec_spawn(UNIT(m),
777 c,
778 &m->exec_context,
779 &exec_params,
780 m->exec_runtime,
781 &m->dynamic_creds,
782 &pid);
783 if (r < 0)
784 return r;
785
786 r = unit_watch_pid(UNIT(m), pid);
787 if (r < 0)
788 /* FIXME: we need to do something here */
789 return r;
790
791 *_pid = pid;
792
793 return 0;
794 }
795
796 static void mount_enter_dead(Mount *m, MountResult f) {
797 assert(m);
798
799 if (m->result == MOUNT_SUCCESS)
800 m->result = f;
801
802 mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD);
803
804 exec_runtime_destroy(m->exec_runtime);
805 m->exec_runtime = exec_runtime_unref(m->exec_runtime);
806
807 exec_context_destroy_runtime_directory(&m->exec_context, UNIT(m)->manager->prefix[EXEC_DIRECTORY_RUNTIME]);
808
809 unit_unref_uid_gid(UNIT(m), true);
810
811 dynamic_creds_destroy(&m->dynamic_creds);
812 }
813
814 static void mount_enter_mounted(Mount *m, MountResult f) {
815 assert(m);
816
817 if (m->result == MOUNT_SUCCESS)
818 m->result = f;
819
820 mount_set_state(m, MOUNT_MOUNTED);
821 }
822
823 static void mount_enter_signal(Mount *m, MountState state, MountResult f) {
824 int r;
825
826 assert(m);
827
828 if (m->result == MOUNT_SUCCESS)
829 m->result = f;
830
831 r = unit_kill_context(
832 UNIT(m),
833 &m->kill_context,
834 (state != MOUNT_MOUNTING_SIGTERM && state != MOUNT_UNMOUNTING_SIGTERM && state != MOUNT_REMOUNTING_SIGTERM) ?
835 KILL_KILL : KILL_TERMINATE,
836 -1,
837 m->control_pid,
838 false);
839 if (r < 0)
840 goto fail;
841
842 if (r > 0) {
843 r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
844 if (r < 0)
845 goto fail;
846
847 mount_set_state(m, state);
848 } else if (state == MOUNT_REMOUNTING_SIGTERM)
849 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
850 else if (state == MOUNT_REMOUNTING_SIGKILL)
851 mount_enter_mounted(m, MOUNT_SUCCESS);
852 else if (state == MOUNT_MOUNTING_SIGTERM)
853 mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, MOUNT_SUCCESS);
854 else if (state == MOUNT_UNMOUNTING_SIGTERM)
855 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS);
856 else
857 mount_enter_dead(m, MOUNT_SUCCESS);
858
859 return;
860
861 fail:
862 log_unit_warning_errno(UNIT(m), r, "Failed to kill processes: %m");
863
864 if (IN_SET(state, MOUNT_REMOUNTING_SIGTERM, MOUNT_REMOUNTING_SIGKILL))
865 mount_enter_mounted(m, MOUNT_FAILURE_RESOURCES);
866 else
867 mount_enter_dead(m, MOUNT_FAILURE_RESOURCES);
868 }
869
870 static void mount_enter_unmounting(Mount *m) {
871 int r;
872
873 assert(m);
874
875 /* Start counting our attempts */
876 if (!IN_SET(m->state,
877 MOUNT_UNMOUNTING,
878 MOUNT_UNMOUNTING_SIGTERM,
879 MOUNT_UNMOUNTING_SIGKILL))
880 m->n_retry_umount = 0;
881
882 m->control_command_id = MOUNT_EXEC_UNMOUNT;
883 m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
884
885 r = exec_command_set(m->control_command, UMOUNT_PATH, m->where, "-c", NULL);
886 if (r >= 0 && m->lazy_unmount)
887 r = exec_command_append(m->control_command, "-l", NULL);
888 if (r >= 0 && m->force_unmount)
889 r = exec_command_append(m->control_command, "-f", NULL);
890 if (r < 0)
891 goto fail;
892
893 mount_unwatch_control_pid(m);
894
895 r = mount_spawn(m, m->control_command, &m->control_pid);
896 if (r < 0)
897 goto fail;
898
899 mount_set_state(m, MOUNT_UNMOUNTING);
900
901 return;
902
903 fail:
904 log_unit_warning_errno(UNIT(m), r, "Failed to run 'umount' task: %m");
905 mount_enter_mounted(m, MOUNT_FAILURE_RESOURCES);
906 }
907
908 static void mount_enter_mounting(Mount *m) {
909 int r;
910 MountParameters *p;
911
912 assert(m);
913
914 m->control_command_id = MOUNT_EXEC_MOUNT;
915 m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
916
917 r = unit_fail_if_symlink(UNIT(m), m->where);
918 if (r < 0)
919 goto fail;
920
921 (void) mkdir_p_label(m->where, m->directory_mode);
922
923 unit_warn_if_dir_nonempty(UNIT(m), m->where);
924
925 /* Create the source directory for bind-mounts if needed */
926 p = get_mount_parameters_fragment(m);
927 if (p && mount_is_bind(p))
928 (void) mkdir_p_label(p->what, m->directory_mode);
929
930 if (p) {
931 _cleanup_free_ char *opts = NULL;
932
933 r = fstab_filter_options(p->options, "nofail\0" "noauto\0" "auto\0", NULL, NULL, &opts);
934 if (r < 0)
935 goto fail;
936
937 r = exec_command_set(m->control_command, MOUNT_PATH, p->what, m->where, NULL);
938 if (r >= 0 && m->sloppy_options)
939 r = exec_command_append(m->control_command, "-s", NULL);
940 if (r >= 0 && p->fstype)
941 r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
942 if (r >= 0 && !isempty(opts))
943 r = exec_command_append(m->control_command, "-o", opts, NULL);
944 } else
945 r = -ENOENT;
946
947 if (r < 0)
948 goto fail;
949
950 mount_unwatch_control_pid(m);
951
952 r = mount_spawn(m, m->control_command, &m->control_pid);
953 if (r < 0)
954 goto fail;
955
956 mount_set_state(m, MOUNT_MOUNTING);
957
958 return;
959
960 fail:
961 log_unit_warning_errno(UNIT(m), r, "Failed to run 'mount' task: %m");
962 mount_enter_dead(m, MOUNT_FAILURE_RESOURCES);
963 }
964
965 static void mount_enter_remounting(Mount *m) {
966 int r;
967 MountParameters *p;
968
969 assert(m);
970
971 m->control_command_id = MOUNT_EXEC_REMOUNT;
972 m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
973
974 p = get_mount_parameters_fragment(m);
975 if (p) {
976 const char *o;
977
978 if (p->options)
979 o = strjoina("remount,", p->options);
980 else
981 o = "remount";
982
983 r = exec_command_set(m->control_command, MOUNT_PATH,
984 p->what, m->where,
985 "-o", o, NULL);
986 if (r >= 0 && m->sloppy_options)
987 r = exec_command_append(m->control_command, "-s", NULL);
988 if (r >= 0 && p->fstype)
989 r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
990 } else
991 r = -ENOENT;
992
993 if (r < 0)
994 goto fail;
995
996 mount_unwatch_control_pid(m);
997
998 r = mount_spawn(m, m->control_command, &m->control_pid);
999 if (r < 0)
1000 goto fail;
1001
1002 mount_set_state(m, MOUNT_REMOUNTING);
1003
1004 return;
1005
1006 fail:
1007 log_unit_warning_errno(UNIT(m), r, "Failed to run 'remount' task: %m");
1008 m->reload_result = MOUNT_FAILURE_RESOURCES;
1009 mount_enter_mounted(m, MOUNT_SUCCESS);
1010 }
1011
1012 static int mount_start(Unit *u) {
1013 Mount *m = MOUNT(u);
1014 int r;
1015
1016 assert(m);
1017
1018 /* We cannot fulfill this request right now, try again later
1019 * please! */
1020 if (IN_SET(m->state,
1021 MOUNT_UNMOUNTING,
1022 MOUNT_UNMOUNTING_SIGTERM,
1023 MOUNT_UNMOUNTING_SIGKILL,
1024 MOUNT_MOUNTING_SIGTERM,
1025 MOUNT_MOUNTING_SIGKILL))
1026 return -EAGAIN;
1027
1028 /* Already on it! */
1029 if (m->state == MOUNT_MOUNTING)
1030 return 0;
1031
1032 assert(IN_SET(m->state, MOUNT_DEAD, MOUNT_FAILED));
1033
1034 r = unit_start_limit_test(u);
1035 if (r < 0) {
1036 mount_enter_dead(m, MOUNT_FAILURE_START_LIMIT_HIT);
1037 return r;
1038 }
1039
1040 r = unit_acquire_invocation_id(u);
1041 if (r < 0)
1042 return r;
1043
1044 m->result = MOUNT_SUCCESS;
1045 m->reload_result = MOUNT_SUCCESS;
1046 m->reset_cpu_usage = true;
1047
1048 mount_enter_mounting(m);
1049 return 1;
1050 }
1051
1052 static int mount_stop(Unit *u) {
1053 Mount *m = MOUNT(u);
1054
1055 assert(m);
1056
1057 /* Already on it */
1058 if (IN_SET(m->state,
1059 MOUNT_UNMOUNTING,
1060 MOUNT_UNMOUNTING_SIGKILL,
1061 MOUNT_UNMOUNTING_SIGTERM,
1062 MOUNT_MOUNTING_SIGTERM,
1063 MOUNT_MOUNTING_SIGKILL))
1064 return 0;
1065
1066 assert(IN_SET(m->state,
1067 MOUNT_MOUNTING,
1068 MOUNT_MOUNTING_DONE,
1069 MOUNT_MOUNTED,
1070 MOUNT_REMOUNTING,
1071 MOUNT_REMOUNTING_SIGTERM,
1072 MOUNT_REMOUNTING_SIGKILL));
1073
1074 mount_enter_unmounting(m);
1075 return 1;
1076 }
1077
1078 static int mount_reload(Unit *u) {
1079 Mount *m = MOUNT(u);
1080
1081 assert(m);
1082
1083 if (m->state == MOUNT_MOUNTING_DONE)
1084 return -EAGAIN;
1085
1086 assert(m->state == MOUNT_MOUNTED);
1087
1088 mount_enter_remounting(m);
1089 return 1;
1090 }
1091
1092 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
1093 Mount *m = MOUNT(u);
1094
1095 assert(m);
1096 assert(f);
1097 assert(fds);
1098
1099 unit_serialize_item(u, f, "state", mount_state_to_string(m->state));
1100 unit_serialize_item(u, f, "result", mount_result_to_string(m->result));
1101 unit_serialize_item(u, f, "reload-result", mount_result_to_string(m->reload_result));
1102
1103 if (m->control_pid > 0)
1104 unit_serialize_item_format(u, f, "control-pid", PID_FMT, m->control_pid);
1105
1106 if (m->control_command_id >= 0)
1107 unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id));
1108
1109 return 0;
1110 }
1111
1112 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1113 Mount *m = MOUNT(u);
1114
1115 assert(u);
1116 assert(key);
1117 assert(value);
1118 assert(fds);
1119
1120 if (streq(key, "state")) {
1121 MountState state;
1122
1123 if ((state = mount_state_from_string(value)) < 0)
1124 log_unit_debug(u, "Failed to parse state value: %s", value);
1125 else
1126 m->deserialized_state = state;
1127 } else if (streq(key, "result")) {
1128 MountResult f;
1129
1130 f = mount_result_from_string(value);
1131 if (f < 0)
1132 log_unit_debug(u, "Failed to parse result value: %s", value);
1133 else if (f != MOUNT_SUCCESS)
1134 m->result = f;
1135
1136 } else if (streq(key, "reload-result")) {
1137 MountResult f;
1138
1139 f = mount_result_from_string(value);
1140 if (f < 0)
1141 log_unit_debug(u, "Failed to parse reload result value: %s", value);
1142 else if (f != MOUNT_SUCCESS)
1143 m->reload_result = f;
1144
1145 } else if (streq(key, "control-pid")) {
1146 pid_t pid;
1147
1148 if (parse_pid(value, &pid) < 0)
1149 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
1150 else
1151 m->control_pid = pid;
1152 } else if (streq(key, "control-command")) {
1153 MountExecCommand id;
1154
1155 id = mount_exec_command_from_string(value);
1156 if (id < 0)
1157 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
1158 else {
1159 m->control_command_id = id;
1160 m->control_command = m->exec_command + id;
1161 }
1162 } else
1163 log_unit_debug(u, "Unknown serialization key: %s", key);
1164
1165 return 0;
1166 }
1167
1168 _pure_ static UnitActiveState mount_active_state(Unit *u) {
1169 assert(u);
1170
1171 return state_translation_table[MOUNT(u)->state];
1172 }
1173
1174 _pure_ static const char *mount_sub_state_to_string(Unit *u) {
1175 assert(u);
1176
1177 return mount_state_to_string(MOUNT(u)->state);
1178 }
1179
1180 _pure_ static bool mount_check_gc(Unit *u) {
1181 Mount *m = MOUNT(u);
1182
1183 assert(m);
1184
1185 return m->from_proc_self_mountinfo;
1186 }
1187
1188 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1189 Mount *m = MOUNT(u);
1190 MountResult f;
1191
1192 assert(m);
1193 assert(pid >= 0);
1194
1195 if (pid != m->control_pid)
1196 return;
1197
1198 m->control_pid = 0;
1199
1200 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
1201 f = MOUNT_SUCCESS;
1202 else if (code == CLD_EXITED)
1203 f = MOUNT_FAILURE_EXIT_CODE;
1204 else if (code == CLD_KILLED)
1205 f = MOUNT_FAILURE_SIGNAL;
1206 else if (code == CLD_DUMPED)
1207 f = MOUNT_FAILURE_CORE_DUMP;
1208 else
1209 assert_not_reached("Unknown code");
1210
1211 if (m->result == MOUNT_SUCCESS)
1212 m->result = f;
1213
1214 if (m->control_command) {
1215 exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status);
1216
1217 m->control_command = NULL;
1218 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1219 }
1220
1221 log_unit_full(u, f == MOUNT_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0,
1222 "Mount process exited, code=%s status=%i", sigchld_code_to_string(code), status);
1223
1224 /* Note that mount(8) returning and the kernel sending us a
1225 * mount table change event might happen out-of-order. If an
1226 * operation succeed we assume the kernel will follow soon too
1227 * and already change into the resulting state. If it fails
1228 * we check if the kernel still knows about the mount. and
1229 * change state accordingly. */
1230
1231 switch (m->state) {
1232
1233 case MOUNT_MOUNTING:
1234 case MOUNT_MOUNTING_DONE:
1235 case MOUNT_MOUNTING_SIGKILL:
1236 case MOUNT_MOUNTING_SIGTERM:
1237
1238 if (f == MOUNT_SUCCESS || m->from_proc_self_mountinfo)
1239 /* If /bin/mount returned success, or if we see the mount point in /proc/self/mountinfo we are
1240 * happy. If we see the first condition first, we should see the second condition
1241 * immediately after – or /bin/mount lies to us and is broken. */
1242 mount_enter_mounted(m, f);
1243 else
1244 mount_enter_dead(m, f);
1245 break;
1246
1247 case MOUNT_REMOUNTING:
1248 case MOUNT_REMOUNTING_SIGKILL:
1249 case MOUNT_REMOUNTING_SIGTERM:
1250
1251 m->reload_result = f;
1252 if (m->from_proc_self_mountinfo)
1253 mount_enter_mounted(m, MOUNT_SUCCESS);
1254 else
1255 mount_enter_dead(m, MOUNT_SUCCESS);
1256
1257 break;
1258
1259 case MOUNT_UNMOUNTING:
1260 case MOUNT_UNMOUNTING_SIGKILL:
1261 case MOUNT_UNMOUNTING_SIGTERM:
1262
1263 if (f == MOUNT_SUCCESS) {
1264
1265 if (m->from_proc_self_mountinfo) {
1266
1267 /* Still a mount point? If so, let's
1268 * try again. Most likely there were
1269 * multiple mount points stacked on
1270 * top of each other. Note that due to
1271 * the io event priority logic we can
1272 * be sure the new mountinfo is loaded
1273 * before we process the SIGCHLD for
1274 * the mount command. */
1275
1276 if (m->n_retry_umount < RETRY_UMOUNT_MAX) {
1277 log_unit_debug(u, "Mount still present, trying again.");
1278 m->n_retry_umount++;
1279 mount_enter_unmounting(m);
1280 } else {
1281 log_unit_debug(u, "Mount still present after %u attempts to unmount, giving up.", m->n_retry_umount);
1282 mount_enter_mounted(m, f);
1283 }
1284 } else
1285 mount_enter_dead(m, f);
1286
1287 } else if (m->from_proc_self_mountinfo)
1288 mount_enter_mounted(m, f);
1289 else
1290 mount_enter_dead(m, f);
1291 break;
1292
1293 default:
1294 assert_not_reached("Uh, control process died at wrong time.");
1295 }
1296
1297 /* Notify clients about changed exit status */
1298 unit_add_to_dbus_queue(u);
1299 }
1300
1301 static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
1302 Mount *m = MOUNT(userdata);
1303
1304 assert(m);
1305 assert(m->timer_event_source == source);
1306
1307 switch (m->state) {
1308
1309 case MOUNT_MOUNTING:
1310 case MOUNT_MOUNTING_DONE:
1311 log_unit_warning(UNIT(m), "Mounting timed out. Stopping.");
1312 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1313 break;
1314
1315 case MOUNT_REMOUNTING:
1316 log_unit_warning(UNIT(m), "Remounting timed out. Stopping.");
1317 m->reload_result = MOUNT_FAILURE_TIMEOUT;
1318 mount_enter_mounted(m, MOUNT_SUCCESS);
1319 break;
1320
1321 case MOUNT_UNMOUNTING:
1322 log_unit_warning(UNIT(m), "Unmounting timed out. Stopping.");
1323 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1324 break;
1325
1326 case MOUNT_MOUNTING_SIGTERM:
1327 if (m->kill_context.send_sigkill) {
1328 log_unit_warning(UNIT(m), "Mounting timed out. Killing.");
1329 mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
1330 } else {
1331 log_unit_warning(UNIT(m), "Mounting timed out. Skipping SIGKILL. Ignoring.");
1332
1333 if (m->from_proc_self_mountinfo)
1334 mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
1335 else
1336 mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
1337 }
1338 break;
1339
1340 case MOUNT_REMOUNTING_SIGTERM:
1341 if (m->kill_context.send_sigkill) {
1342 log_unit_warning(UNIT(m), "Remounting timed out. Killing.");
1343 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
1344 } else {
1345 log_unit_warning(UNIT(m), "Remounting timed out. Skipping SIGKILL. Ignoring.");
1346
1347 if (m->from_proc_self_mountinfo)
1348 mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
1349 else
1350 mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
1351 }
1352 break;
1353
1354 case MOUNT_UNMOUNTING_SIGTERM:
1355 if (m->kill_context.send_sigkill) {
1356 log_unit_warning(UNIT(m), "Unmounting timed out. Killing.");
1357 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
1358 } else {
1359 log_unit_warning(UNIT(m), "Unmounting timed out. Skipping SIGKILL. Ignoring.");
1360
1361 if (m->from_proc_self_mountinfo)
1362 mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
1363 else
1364 mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
1365 }
1366 break;
1367
1368 case MOUNT_MOUNTING_SIGKILL:
1369 case MOUNT_REMOUNTING_SIGKILL:
1370 case MOUNT_UNMOUNTING_SIGKILL:
1371 log_unit_warning(UNIT(m),"Mount process still around after SIGKILL. Ignoring.");
1372
1373 if (m->from_proc_self_mountinfo)
1374 mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
1375 else
1376 mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
1377 break;
1378
1379 default:
1380 assert_not_reached("Timeout at wrong time.");
1381 }
1382
1383 return 0;
1384 }
1385
1386 typedef struct {
1387 bool is_mounted;
1388 bool just_mounted;
1389 bool just_changed;
1390 } MountSetupFlags;
1391
1392 static int mount_setup_new_unit(
1393 Unit *u,
1394 const char *what,
1395 const char *where,
1396 const char *options,
1397 const char *fstype,
1398 MountSetupFlags *flags) {
1399
1400 MountParameters *p;
1401
1402 assert(u);
1403 assert(flags);
1404
1405 u->source_path = strdup("/proc/self/mountinfo");
1406 MOUNT(u)->where = strdup(where);
1407 if (!u->source_path || !MOUNT(u)->where)
1408 return -ENOMEM;
1409
1410 /* Make sure to initialize those fields before mount_is_extrinsic(). */
1411 MOUNT(u)->from_proc_self_mountinfo = true;
1412 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1413
1414 p->what = strdup(what);
1415 p->options = strdup(options);
1416 p->fstype = strdup(fstype);
1417 if (!p->what || !p->options || !p->fstype)
1418 return -ENOMEM;
1419
1420 if (!mount_is_extrinsic(MOUNT(u))) {
1421 const char *target;
1422 int r;
1423
1424 target = mount_is_network(p) ? SPECIAL_REMOTE_FS_TARGET : SPECIAL_LOCAL_FS_TARGET;
1425 r = unit_add_dependency_by_name(u, UNIT_BEFORE, target, NULL, true);
1426 if (r < 0)
1427 return r;
1428
1429 r = unit_add_dependency_by_name(u, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true);
1430 if (r < 0)
1431 return r;
1432 }
1433
1434 unit_add_to_load_queue(u);
1435 flags->is_mounted = true;
1436 flags->just_mounted = true;
1437 flags->just_changed = true;
1438
1439 return 0;
1440 }
1441
1442 static int mount_setup_existing_unit(
1443 Unit *u,
1444 const char *what,
1445 const char *where,
1446 const char *options,
1447 const char *fstype,
1448 MountSetupFlags *flags) {
1449
1450 MountParameters *p;
1451 bool load_extras = false;
1452 int r1, r2, r3;
1453
1454 assert(u);
1455 assert(flags);
1456
1457 if (!MOUNT(u)->where) {
1458 MOUNT(u)->where = strdup(where);
1459 if (!MOUNT(u)->where)
1460 return -ENOMEM;
1461 }
1462
1463 /* Make sure to initialize those fields before mount_is_extrinsic(). */
1464 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1465
1466 r1 = free_and_strdup(&p->what, what);
1467 r2 = free_and_strdup(&p->options, options);
1468 r3 = free_and_strdup(&p->fstype, fstype);
1469 if (r1 < 0 || r2 < 0 || r3 < 0)
1470 return -ENOMEM;
1471
1472 flags->just_changed = r1 > 0 || r2 > 0 || r3 > 0;
1473 flags->is_mounted = true;
1474 flags->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
1475
1476 MOUNT(u)->from_proc_self_mountinfo = true;
1477
1478 if (!mount_is_extrinsic(MOUNT(u)) && mount_is_network(p)) {
1479 /* _netdev option may have shown up late, or on a
1480 * remount. Add remote-fs dependencies, even though
1481 * local-fs ones may already be there.
1482 *
1483 * Note: due to a current limitation (we don't track
1484 * in the dependency "Set*" objects who created a
1485 * dependency), we can only add deps, never lose them,
1486 * until the next full daemon-reload. */
1487 unit_add_dependency_by_name(u, UNIT_BEFORE, SPECIAL_REMOTE_FS_TARGET, NULL, true);
1488 load_extras = true;
1489 }
1490
1491 if (u->load_state == UNIT_NOT_FOUND) {
1492 u->load_state = UNIT_LOADED;
1493 u->load_error = 0;
1494
1495 /* Load in the extras later on, after we
1496 * finished initialization of the unit */
1497
1498 /* FIXME: since we're going to load the unit later on, why setting load_extras=true ? */
1499 load_extras = true;
1500 flags->just_changed = true;
1501 }
1502
1503 if (load_extras)
1504 return mount_add_extras(MOUNT(u));
1505
1506 return 0;
1507 }
1508
1509 static int mount_setup_unit(
1510 Manager *m,
1511 const char *what,
1512 const char *where,
1513 const char *options,
1514 const char *fstype,
1515 bool set_flags) {
1516
1517 _cleanup_free_ char *e = NULL;
1518 MountSetupFlags flags;
1519 Unit *u;
1520 int r;
1521
1522 assert(m);
1523 assert(what);
1524 assert(where);
1525 assert(options);
1526 assert(fstype);
1527
1528 /* Ignore API mount points. They should never be referenced in
1529 * dependencies ever. */
1530 if (mount_point_is_api(where) || mount_point_ignore(where))
1531 return 0;
1532
1533 if (streq(fstype, "autofs"))
1534 return 0;
1535
1536 /* probably some kind of swap, ignore */
1537 if (!is_path(where))
1538 return 0;
1539
1540 r = unit_name_from_path(where, ".mount", &e);
1541 if (r < 0)
1542 return r;
1543
1544 u = manager_get_unit(m, e);
1545 if (!u) {
1546 /* First time we see this mount point meaning that it's
1547 * not been initiated by a mount unit but rather by the
1548 * sysadmin having called mount(8) directly. */
1549 r = unit_new_for_name(m, sizeof(Mount), e, &u);
1550 if (r < 0)
1551 goto fail;
1552
1553 r = mount_setup_new_unit(u, what, where, options, fstype, &flags);
1554 if (r < 0)
1555 unit_free(u);
1556 } else
1557 r = mount_setup_existing_unit(u, what, where, options, fstype, &flags);
1558
1559 if (r < 0)
1560 goto fail;
1561
1562 if (set_flags) {
1563 MOUNT(u)->is_mounted = flags.is_mounted;
1564 MOUNT(u)->just_mounted = flags.just_mounted;
1565 MOUNT(u)->just_changed = flags.just_changed;
1566 }
1567
1568 if (flags.just_changed)
1569 unit_add_to_dbus_queue(u);
1570
1571 return 0;
1572 fail:
1573 log_warning_errno(r, "Failed to set up mount unit: %m");
1574 return r;
1575 }
1576
1577 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1578 _cleanup_(mnt_free_tablep) struct libmnt_table *t = NULL;
1579 _cleanup_(mnt_free_iterp) struct libmnt_iter *i = NULL;
1580 int r = 0;
1581
1582 assert(m);
1583
1584 t = mnt_new_table();
1585 if (!t)
1586 return log_oom();
1587
1588 i = mnt_new_iter(MNT_ITER_FORWARD);
1589 if (!i)
1590 return log_oom();
1591
1592 r = mnt_table_parse_mtab(t, NULL);
1593 if (r < 0)
1594 return log_error_errno(r, "Failed to parse /proc/self/mountinfo: %m");
1595
1596 r = 0;
1597 for (;;) {
1598 const char *device, *path, *options, *fstype;
1599 _cleanup_free_ char *d = NULL, *p = NULL;
1600 struct libmnt_fs *fs;
1601 int k;
1602
1603 k = mnt_table_next_fs(t, i, &fs);
1604 if (k == 1)
1605 break;
1606 if (k < 0)
1607 return log_error_errno(k, "Failed to get next entry from /proc/self/mountinfo: %m");
1608
1609 device = mnt_fs_get_source(fs);
1610 path = mnt_fs_get_target(fs);
1611 options = mnt_fs_get_options(fs);
1612 fstype = mnt_fs_get_fstype(fs);
1613
1614 if (!device || !path)
1615 continue;
1616
1617 if (cunescape(device, UNESCAPE_RELAX, &d) < 0)
1618 return log_oom();
1619
1620 if (cunescape(path, UNESCAPE_RELAX, &p) < 0)
1621 return log_oom();
1622
1623 (void) device_found_node(m, d, true, DEVICE_FOUND_MOUNT, set_flags);
1624
1625 k = mount_setup_unit(m, d, p, options, fstype, set_flags);
1626 if (r == 0 && k < 0)
1627 r = k;
1628 }
1629
1630 return r;
1631 }
1632
1633 static void mount_shutdown(Manager *m) {
1634
1635 assert(m);
1636
1637 m->mount_event_source = sd_event_source_unref(m->mount_event_source);
1638
1639 mnt_unref_monitor(m->mount_monitor);
1640 m->mount_monitor = NULL;
1641 }
1642
1643 static int mount_get_timeout(Unit *u, usec_t *timeout) {
1644 Mount *m = MOUNT(u);
1645 usec_t t;
1646 int r;
1647
1648 if (!m->timer_event_source)
1649 return 0;
1650
1651 r = sd_event_source_get_time(m->timer_event_source, &t);
1652 if (r < 0)
1653 return r;
1654 if (t == USEC_INFINITY)
1655 return 0;
1656
1657 *timeout = t;
1658 return 1;
1659 }
1660
1661 static int synthesize_root_mount(Manager *m) {
1662 Unit *u;
1663 int r;
1664
1665 assert(m);
1666
1667 /* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's
1668 * unconditionally synthesize it here and mark it as perpetual. */
1669
1670 u = manager_get_unit(m, SPECIAL_ROOT_MOUNT);
1671 if (!u) {
1672 r = unit_new_for_name(m, sizeof(Mount), SPECIAL_ROOT_MOUNT, &u);
1673 if (r < 0)
1674 return log_error_errno(r, "Failed to allocate the special " SPECIAL_ROOT_MOUNT " unit: %m");
1675 }
1676
1677 u->perpetual = true;
1678 MOUNT(u)->deserialized_state = MOUNT_MOUNTED;
1679
1680 unit_add_to_load_queue(u);
1681 unit_add_to_dbus_queue(u);
1682
1683 return 0;
1684 }
1685
1686 static bool mount_is_mounted(Mount *m) {
1687 assert(m);
1688
1689 return UNIT(m)->perpetual || m->is_mounted;
1690 }
1691
1692 static void mount_enumerate(Manager *m) {
1693 int r;
1694
1695 assert(m);
1696
1697 r = synthesize_root_mount(m);
1698 if (r < 0)
1699 goto fail;
1700
1701 mnt_init_debug(0);
1702
1703 if (!m->mount_monitor) {
1704 int fd;
1705
1706 m->mount_monitor = mnt_new_monitor();
1707 if (!m->mount_monitor) {
1708 log_oom();
1709 goto fail;
1710 }
1711
1712 r = mnt_monitor_enable_kernel(m->mount_monitor, 1);
1713 if (r < 0) {
1714 log_error_errno(r, "Failed to enable watching of kernel mount events: %m");
1715 goto fail;
1716 }
1717
1718 r = mnt_monitor_enable_userspace(m->mount_monitor, 1, NULL);
1719 if (r < 0) {
1720 log_error_errno(r, "Failed to enable watching of userspace mount events: %m");
1721 goto fail;
1722 }
1723
1724 /* mnt_unref_monitor() will close the fd */
1725 fd = r = mnt_monitor_get_fd(m->mount_monitor);
1726 if (r < 0) {
1727 log_error_errno(r, "Failed to acquire watch file descriptor: %m");
1728 goto fail;
1729 }
1730
1731 r = sd_event_add_io(m->event, &m->mount_event_source, fd, EPOLLIN, mount_dispatch_io, m);
1732 if (r < 0) {
1733 log_error_errno(r, "Failed to watch mount file descriptor: %m");
1734 goto fail;
1735 }
1736
1737 r = sd_event_source_set_priority(m->mount_event_source, -10);
1738 if (r < 0) {
1739 log_error_errno(r, "Failed to adjust mount watch priority: %m");
1740 goto fail;
1741 }
1742
1743 (void) sd_event_source_set_description(m->mount_event_source, "mount-monitor-dispatch");
1744 }
1745
1746 r = mount_load_proc_self_mountinfo(m, false);
1747 if (r < 0)
1748 goto fail;
1749
1750 return;
1751
1752 fail:
1753 mount_shutdown(m);
1754 }
1755
1756 static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
1757 _cleanup_set_free_ Set *around = NULL, *gone = NULL;
1758 Manager *m = userdata;
1759 const char *what;
1760 Iterator i;
1761 Unit *u;
1762 int r;
1763
1764 assert(m);
1765 assert(revents & EPOLLIN);
1766
1767 if (fd == mnt_monitor_get_fd(m->mount_monitor)) {
1768 bool rescan = false;
1769
1770 /* Drain all events and verify that the event is valid.
1771 *
1772 * Note that libmount also monitors /run/mount mkdir if the
1773 * directory does not exist yet. The mkdir may generate event
1774 * which is irrelevant for us.
1775 *
1776 * error: r < 0; valid: r == 0, false positive: rc == 1 */
1777 do {
1778 r = mnt_monitor_next_change(m->mount_monitor, NULL, NULL);
1779 if (r == 0)
1780 rescan = true;
1781 else if (r < 0)
1782 return log_error_errno(r, "Failed to drain libmount events");
1783 } while (r == 0);
1784
1785 log_debug("libmount event [rescan: %s]", yes_no(rescan));
1786 if (!rescan)
1787 return 0;
1788 }
1789
1790 r = mount_load_proc_self_mountinfo(m, true);
1791 if (r < 0) {
1792 /* Reset flags, just in case, for later calls */
1793 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1794 Mount *mount = MOUNT(u);
1795
1796 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1797 }
1798
1799 return 0;
1800 }
1801
1802 manager_dispatch_load_queue(m);
1803
1804 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1805 Mount *mount = MOUNT(u);
1806
1807 if (!mount_is_mounted(mount)) {
1808
1809 /* A mount point is not around right now. It
1810 * might be gone, or might never have
1811 * existed. */
1812
1813 if (mount->from_proc_self_mountinfo &&
1814 mount->parameters_proc_self_mountinfo.what) {
1815
1816 /* Remember that this device might just have disappeared */
1817 if (set_ensure_allocated(&gone, &string_hash_ops) < 0 ||
1818 set_put(gone, mount->parameters_proc_self_mountinfo.what) < 0)
1819 log_oom(); /* we don't care too much about OOM here... */
1820 }
1821
1822 mount->from_proc_self_mountinfo = false;
1823
1824 switch (mount->state) {
1825
1826 case MOUNT_MOUNTED:
1827 /* This has just been unmounted by
1828 * somebody else, follow the state
1829 * change. */
1830 mount->result = MOUNT_SUCCESS; /* make sure we forget any earlier umount failures */
1831 mount_enter_dead(mount, MOUNT_SUCCESS);
1832 break;
1833
1834 default:
1835 break;
1836 }
1837
1838 } else if (mount->just_mounted || mount->just_changed) {
1839
1840 /* A mount point was added or changed */
1841
1842 switch (mount->state) {
1843
1844 case MOUNT_DEAD:
1845 case MOUNT_FAILED:
1846
1847 /* This has just been mounted by somebody else, follow the state change, but let's
1848 * generate a new invocation ID for this implicitly and automatically. */
1849 (void) unit_acquire_invocation_id(UNIT(mount));
1850 mount_enter_mounted(mount, MOUNT_SUCCESS);
1851 break;
1852
1853 case MOUNT_MOUNTING:
1854 mount_set_state(mount, MOUNT_MOUNTING_DONE);
1855 break;
1856
1857 default:
1858 /* Nothing really changed, but let's
1859 * issue an notification call
1860 * nonetheless, in case somebody is
1861 * waiting for this. (e.g. file system
1862 * ro/rw remounts.) */
1863 mount_set_state(mount, mount->state);
1864 break;
1865 }
1866 }
1867
1868 if (mount_is_mounted(mount) &&
1869 mount->from_proc_self_mountinfo &&
1870 mount->parameters_proc_self_mountinfo.what) {
1871
1872 if (set_ensure_allocated(&around, &string_hash_ops) < 0 ||
1873 set_put(around, mount->parameters_proc_self_mountinfo.what) < 0)
1874 log_oom();
1875 }
1876
1877 /* Reset the flags for later calls */
1878 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1879 }
1880
1881 SET_FOREACH(what, gone, i) {
1882 if (set_contains(around, what))
1883 continue;
1884
1885 /* Let the device units know that the device is no longer mounted */
1886 (void) device_found_node(m, what, false, DEVICE_FOUND_MOUNT, true);
1887 }
1888
1889 return 0;
1890 }
1891
1892 static void mount_reset_failed(Unit *u) {
1893 Mount *m = MOUNT(u);
1894
1895 assert(m);
1896
1897 if (m->state == MOUNT_FAILED)
1898 mount_set_state(m, MOUNT_DEAD);
1899
1900 m->result = MOUNT_SUCCESS;
1901 m->reload_result = MOUNT_SUCCESS;
1902 }
1903
1904 static int mount_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
1905 return unit_kill_common(u, who, signo, -1, MOUNT(u)->control_pid, error);
1906 }
1907
1908 static int mount_control_pid(Unit *u) {
1909 Mount *m = MOUNT(u);
1910
1911 assert(m);
1912
1913 return m->control_pid;
1914 }
1915
1916 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1917 [MOUNT_EXEC_MOUNT] = "ExecMount",
1918 [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1919 [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1920 };
1921
1922 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1923
1924 static const char* const mount_result_table[_MOUNT_RESULT_MAX] = {
1925 [MOUNT_SUCCESS] = "success",
1926 [MOUNT_FAILURE_RESOURCES] = "resources",
1927 [MOUNT_FAILURE_TIMEOUT] = "timeout",
1928 [MOUNT_FAILURE_EXIT_CODE] = "exit-code",
1929 [MOUNT_FAILURE_SIGNAL] = "signal",
1930 [MOUNT_FAILURE_CORE_DUMP] = "core-dump",
1931 [MOUNT_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
1932 };
1933
1934 DEFINE_STRING_TABLE_LOOKUP(mount_result, MountResult);
1935
1936 const UnitVTable mount_vtable = {
1937 .object_size = sizeof(Mount),
1938 .exec_context_offset = offsetof(Mount, exec_context),
1939 .cgroup_context_offset = offsetof(Mount, cgroup_context),
1940 .kill_context_offset = offsetof(Mount, kill_context),
1941 .exec_runtime_offset = offsetof(Mount, exec_runtime),
1942 .dynamic_creds_offset = offsetof(Mount, dynamic_creds),
1943
1944 .sections =
1945 "Unit\0"
1946 "Mount\0"
1947 "Install\0",
1948 .private_section = "Mount",
1949
1950 .init = mount_init,
1951 .load = mount_load,
1952 .done = mount_done,
1953
1954 .coldplug = mount_coldplug,
1955
1956 .dump = mount_dump,
1957
1958 .start = mount_start,
1959 .stop = mount_stop,
1960 .reload = mount_reload,
1961
1962 .kill = mount_kill,
1963
1964 .serialize = mount_serialize,
1965 .deserialize_item = mount_deserialize_item,
1966
1967 .active_state = mount_active_state,
1968 .sub_state_to_string = mount_sub_state_to_string,
1969
1970 .check_gc = mount_check_gc,
1971
1972 .sigchld_event = mount_sigchld_event,
1973
1974 .reset_failed = mount_reset_failed,
1975
1976 .control_pid = mount_control_pid,
1977
1978 .bus_vtable = bus_mount_vtable,
1979 .bus_set_property = bus_mount_set_property,
1980 .bus_commit_properties = bus_mount_commit_properties,
1981
1982 .get_timeout = mount_get_timeout,
1983
1984 .can_transient = true,
1985
1986 .enumerate = mount_enumerate,
1987 .shutdown = mount_shutdown,
1988
1989 .status_message_formats = {
1990 .starting_stopping = {
1991 [0] = "Mounting %s...",
1992 [1] = "Unmounting %s...",
1993 },
1994 .finished_start_job = {
1995 [JOB_DONE] = "Mounted %s.",
1996 [JOB_FAILED] = "Failed to mount %s.",
1997 [JOB_TIMEOUT] = "Timed out mounting %s.",
1998 },
1999 .finished_stop_job = {
2000 [JOB_DONE] = "Unmounted %s.",
2001 [JOB_FAILED] = "Failed unmounting %s.",
2002 [JOB_TIMEOUT] = "Timed out unmounting %s.",
2003 },
2004 },
2005 };
Unnamed repository; edit this file 'description' to name the repository.