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Merge pull request #6064 from keszybz/lock-session
[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)
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_PERMISSIONS|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 exec_params.environment = UNIT(m)->manager->environment;
774 exec_params.confirm_spawn = manager_get_confirm_spawn(UNIT(m)->manager);
775 exec_params.cgroup_supported = UNIT(m)->manager->cgroup_supported;
776 exec_params.cgroup_path = UNIT(m)->cgroup_path;
777 exec_params.cgroup_delegate = m->cgroup_context.delegate;
778 exec_params.runtime_prefix = manager_get_runtime_prefix(UNIT(m)->manager);
779
780 r = exec_spawn(UNIT(m),
781 c,
782 &m->exec_context,
783 &exec_params,
784 m->exec_runtime,
785 &m->dynamic_creds,
786 &pid);
787 if (r < 0)
788 return r;
789
790 r = unit_watch_pid(UNIT(m), pid);
791 if (r < 0)
792 /* FIXME: we need to do something here */
793 return r;
794
795 *_pid = pid;
796
797 return 0;
798 }
799
800 static void mount_enter_dead(Mount *m, MountResult f) {
801 assert(m);
802
803 if (m->result == MOUNT_SUCCESS)
804 m->result = f;
805
806 mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD);
807
808 exec_runtime_destroy(m->exec_runtime);
809 m->exec_runtime = exec_runtime_unref(m->exec_runtime);
810
811 exec_context_destroy_runtime_directory(&m->exec_context, manager_get_runtime_prefix(UNIT(m)->manager));
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_signal(Mount *m, MountState state, MountResult f) {
828 int r;
829
830 assert(m);
831
832 if (m->result == MOUNT_SUCCESS)
833 m->result = f;
834
835 r = unit_kill_context(
836 UNIT(m),
837 &m->kill_context,
838 (state != MOUNT_MOUNTING_SIGTERM && state != MOUNT_UNMOUNTING_SIGTERM && state != MOUNT_REMOUNTING_SIGTERM) ?
839 KILL_KILL : KILL_TERMINATE,
840 -1,
841 m->control_pid,
842 false);
843 if (r < 0)
844 goto fail;
845
846 if (r > 0) {
847 r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
848 if (r < 0)
849 goto fail;
850
851 mount_set_state(m, state);
852 } else if (state == MOUNT_REMOUNTING_SIGTERM)
853 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
854 else if (state == MOUNT_REMOUNTING_SIGKILL)
855 mount_enter_mounted(m, MOUNT_SUCCESS);
856 else if (state == MOUNT_MOUNTING_SIGTERM)
857 mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, MOUNT_SUCCESS);
858 else if (state == MOUNT_UNMOUNTING_SIGTERM)
859 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS);
860 else
861 mount_enter_dead(m, MOUNT_SUCCESS);
862
863 return;
864
865 fail:
866 log_unit_warning_errno(UNIT(m), r, "Failed to kill processes: %m");
867
868 if (IN_SET(state, MOUNT_REMOUNTING_SIGTERM, MOUNT_REMOUNTING_SIGKILL))
869 mount_enter_mounted(m, MOUNT_FAILURE_RESOURCES);
870 else
871 mount_enter_dead(m, MOUNT_FAILURE_RESOURCES);
872 }
873
874 static void mount_enter_unmounting(Mount *m) {
875 int r;
876
877 assert(m);
878
879 /* Start counting our attempts */
880 if (!IN_SET(m->state,
881 MOUNT_UNMOUNTING,
882 MOUNT_UNMOUNTING_SIGTERM,
883 MOUNT_UNMOUNTING_SIGKILL))
884 m->n_retry_umount = 0;
885
886 m->control_command_id = MOUNT_EXEC_UNMOUNT;
887 m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
888
889 r = exec_command_set(m->control_command, UMOUNT_PATH, m->where, "-c", NULL);
890 if (r >= 0 && m->lazy_unmount)
891 r = exec_command_append(m->control_command, "-l", NULL);
892 if (r >= 0 && m->force_unmount)
893 r = exec_command_append(m->control_command, "-f", NULL);
894 if (r < 0)
895 goto fail;
896
897 mount_unwatch_control_pid(m);
898
899 r = mount_spawn(m, m->control_command, &m->control_pid);
900 if (r < 0)
901 goto fail;
902
903 mount_set_state(m, MOUNT_UNMOUNTING);
904
905 return;
906
907 fail:
908 log_unit_warning_errno(UNIT(m), r, "Failed to run 'umount' task: %m");
909 mount_enter_mounted(m, MOUNT_FAILURE_RESOURCES);
910 }
911
912 static void mount_enter_mounting(Mount *m) {
913 int r;
914 MountParameters *p;
915
916 assert(m);
917
918 m->control_command_id = MOUNT_EXEC_MOUNT;
919 m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
920
921 r = unit_fail_if_symlink(UNIT(m), m->where);
922 if (r < 0)
923 goto fail;
924
925 (void) mkdir_p_label(m->where, m->directory_mode);
926
927 unit_warn_if_dir_nonempty(UNIT(m), m->where);
928
929 /* Create the source directory for bind-mounts if needed */
930 p = get_mount_parameters_fragment(m);
931 if (p && mount_is_bind(p))
932 (void) mkdir_p_label(p->what, m->directory_mode);
933
934 if (p) {
935 _cleanup_free_ char *opts = NULL;
936
937 r = fstab_filter_options(p->options, "nofail\0" "noauto\0" "auto\0", NULL, NULL, &opts);
938 if (r < 0)
939 goto fail;
940
941 r = exec_command_set(m->control_command, MOUNT_PATH, p->what, m->where, NULL);
942 if (r >= 0 && m->sloppy_options)
943 r = exec_command_append(m->control_command, "-s", NULL);
944 if (r >= 0 && p->fstype)
945 r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
946 if (r >= 0 && !isempty(opts))
947 r = exec_command_append(m->control_command, "-o", opts, NULL);
948 } else
949 r = -ENOENT;
950
951 if (r < 0)
952 goto fail;
953
954 mount_unwatch_control_pid(m);
955
956 r = mount_spawn(m, m->control_command, &m->control_pid);
957 if (r < 0)
958 goto fail;
959
960 mount_set_state(m, MOUNT_MOUNTING);
961
962 return;
963
964 fail:
965 log_unit_warning_errno(UNIT(m), r, "Failed to run 'mount' task: %m");
966 mount_enter_dead(m, MOUNT_FAILURE_RESOURCES);
967 }
968
969 static void mount_enter_remounting(Mount *m) {
970 int r;
971 MountParameters *p;
972
973 assert(m);
974
975 m->control_command_id = MOUNT_EXEC_REMOUNT;
976 m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
977
978 p = get_mount_parameters_fragment(m);
979 if (p) {
980 const char *o;
981
982 if (p->options)
983 o = strjoina("remount,", p->options);
984 else
985 o = "remount";
986
987 r = exec_command_set(m->control_command, MOUNT_PATH,
988 p->what, m->where,
989 "-o", o, NULL);
990 if (r >= 0 && m->sloppy_options)
991 r = exec_command_append(m->control_command, "-s", NULL);
992 if (r >= 0 && p->fstype)
993 r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
994 } else
995 r = -ENOENT;
996
997 if (r < 0)
998 goto fail;
999
1000 mount_unwatch_control_pid(m);
1001
1002 r = mount_spawn(m, m->control_command, &m->control_pid);
1003 if (r < 0)
1004 goto fail;
1005
1006 mount_set_state(m, MOUNT_REMOUNTING);
1007
1008 return;
1009
1010 fail:
1011 log_unit_warning_errno(UNIT(m), r, "Failed to run 'remount' task: %m");
1012 m->reload_result = MOUNT_FAILURE_RESOURCES;
1013 mount_enter_mounted(m, MOUNT_SUCCESS);
1014 }
1015
1016 static int mount_start(Unit *u) {
1017 Mount *m = MOUNT(u);
1018 int r;
1019
1020 assert(m);
1021
1022 /* We cannot fulfill this request right now, try again later
1023 * please! */
1024 if (IN_SET(m->state,
1025 MOUNT_UNMOUNTING,
1026 MOUNT_UNMOUNTING_SIGTERM,
1027 MOUNT_UNMOUNTING_SIGKILL,
1028 MOUNT_MOUNTING_SIGTERM,
1029 MOUNT_MOUNTING_SIGKILL))
1030 return -EAGAIN;
1031
1032 /* Already on it! */
1033 if (m->state == MOUNT_MOUNTING)
1034 return 0;
1035
1036 assert(IN_SET(m->state, MOUNT_DEAD, MOUNT_FAILED));
1037
1038 r = unit_start_limit_test(u);
1039 if (r < 0) {
1040 mount_enter_dead(m, MOUNT_FAILURE_START_LIMIT_HIT);
1041 return r;
1042 }
1043
1044 r = unit_acquire_invocation_id(u);
1045 if (r < 0)
1046 return r;
1047
1048 m->result = MOUNT_SUCCESS;
1049 m->reload_result = MOUNT_SUCCESS;
1050 m->reset_cpu_usage = true;
1051
1052 mount_enter_mounting(m);
1053 return 1;
1054 }
1055
1056 static int mount_stop(Unit *u) {
1057 Mount *m = MOUNT(u);
1058
1059 assert(m);
1060
1061 /* Already on it */
1062 if (IN_SET(m->state,
1063 MOUNT_UNMOUNTING,
1064 MOUNT_UNMOUNTING_SIGKILL,
1065 MOUNT_UNMOUNTING_SIGTERM,
1066 MOUNT_MOUNTING_SIGTERM,
1067 MOUNT_MOUNTING_SIGKILL))
1068 return 0;
1069
1070 assert(IN_SET(m->state,
1071 MOUNT_MOUNTING,
1072 MOUNT_MOUNTING_DONE,
1073 MOUNT_MOUNTED,
1074 MOUNT_REMOUNTING,
1075 MOUNT_REMOUNTING_SIGTERM,
1076 MOUNT_REMOUNTING_SIGKILL));
1077
1078 mount_enter_unmounting(m);
1079 return 1;
1080 }
1081
1082 static int mount_reload(Unit *u) {
1083 Mount *m = MOUNT(u);
1084
1085 assert(m);
1086
1087 if (m->state == MOUNT_MOUNTING_DONE)
1088 return -EAGAIN;
1089
1090 assert(m->state == MOUNT_MOUNTED);
1091
1092 mount_enter_remounting(m);
1093 return 1;
1094 }
1095
1096 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
1097 Mount *m = MOUNT(u);
1098
1099 assert(m);
1100 assert(f);
1101 assert(fds);
1102
1103 unit_serialize_item(u, f, "state", mount_state_to_string(m->state));
1104 unit_serialize_item(u, f, "result", mount_result_to_string(m->result));
1105 unit_serialize_item(u, f, "reload-result", mount_result_to_string(m->reload_result));
1106
1107 if (m->control_pid > 0)
1108 unit_serialize_item_format(u, f, "control-pid", PID_FMT, m->control_pid);
1109
1110 if (m->control_command_id >= 0)
1111 unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id));
1112
1113 return 0;
1114 }
1115
1116 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1117 Mount *m = MOUNT(u);
1118
1119 assert(u);
1120 assert(key);
1121 assert(value);
1122 assert(fds);
1123
1124 if (streq(key, "state")) {
1125 MountState state;
1126
1127 if ((state = mount_state_from_string(value)) < 0)
1128 log_unit_debug(u, "Failed to parse state value: %s", value);
1129 else
1130 m->deserialized_state = state;
1131 } else if (streq(key, "result")) {
1132 MountResult f;
1133
1134 f = mount_result_from_string(value);
1135 if (f < 0)
1136 log_unit_debug(u, "Failed to parse result value: %s", value);
1137 else if (f != MOUNT_SUCCESS)
1138 m->result = f;
1139
1140 } else if (streq(key, "reload-result")) {
1141 MountResult f;
1142
1143 f = mount_result_from_string(value);
1144 if (f < 0)
1145 log_unit_debug(u, "Failed to parse reload result value: %s", value);
1146 else if (f != MOUNT_SUCCESS)
1147 m->reload_result = f;
1148
1149 } else if (streq(key, "control-pid")) {
1150 pid_t pid;
1151
1152 if (parse_pid(value, &pid) < 0)
1153 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
1154 else
1155 m->control_pid = pid;
1156 } else if (streq(key, "control-command")) {
1157 MountExecCommand id;
1158
1159 id = mount_exec_command_from_string(value);
1160 if (id < 0)
1161 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
1162 else {
1163 m->control_command_id = id;
1164 m->control_command = m->exec_command + id;
1165 }
1166 } else
1167 log_unit_debug(u, "Unknown serialization key: %s", key);
1168
1169 return 0;
1170 }
1171
1172 _pure_ static UnitActiveState mount_active_state(Unit *u) {
1173 assert(u);
1174
1175 return state_translation_table[MOUNT(u)->state];
1176 }
1177
1178 _pure_ static const char *mount_sub_state_to_string(Unit *u) {
1179 assert(u);
1180
1181 return mount_state_to_string(MOUNT(u)->state);
1182 }
1183
1184 _pure_ static bool mount_check_gc(Unit *u) {
1185 Mount *m = MOUNT(u);
1186
1187 assert(m);
1188
1189 return m->from_proc_self_mountinfo;
1190 }
1191
1192 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1193 Mount *m = MOUNT(u);
1194 MountResult f;
1195
1196 assert(m);
1197 assert(pid >= 0);
1198
1199 if (pid != m->control_pid)
1200 return;
1201
1202 m->control_pid = 0;
1203
1204 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
1205 f = MOUNT_SUCCESS;
1206 else if (code == CLD_EXITED)
1207 f = MOUNT_FAILURE_EXIT_CODE;
1208 else if (code == CLD_KILLED)
1209 f = MOUNT_FAILURE_SIGNAL;
1210 else if (code == CLD_DUMPED)
1211 f = MOUNT_FAILURE_CORE_DUMP;
1212 else
1213 assert_not_reached("Unknown code");
1214
1215 if (m->result == MOUNT_SUCCESS)
1216 m->result = f;
1217
1218 if (m->control_command) {
1219 exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status);
1220
1221 m->control_command = NULL;
1222 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1223 }
1224
1225 log_unit_full(u, f == MOUNT_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0,
1226 "Mount process exited, code=%s status=%i", sigchld_code_to_string(code), status);
1227
1228 /* Note that mount(8) returning and the kernel sending us a
1229 * mount table change event might happen out-of-order. If an
1230 * operation succeed we assume the kernel will follow soon too
1231 * and already change into the resulting state. If it fails
1232 * we check if the kernel still knows about the mount. and
1233 * change state accordingly. */
1234
1235 switch (m->state) {
1236
1237 case MOUNT_MOUNTING:
1238 case MOUNT_MOUNTING_DONE:
1239 case MOUNT_MOUNTING_SIGKILL:
1240 case MOUNT_MOUNTING_SIGTERM:
1241
1242 if (f == MOUNT_SUCCESS || m->from_proc_self_mountinfo)
1243 /* If /bin/mount returned success, or if we see the mount point in /proc/self/mountinfo we are
1244 * happy. If we see the first condition first, we should see the second condition
1245 * immediately after – or /bin/mount lies to us and is broken. */
1246 mount_enter_mounted(m, f);
1247 else
1248 mount_enter_dead(m, f);
1249 break;
1250
1251 case MOUNT_REMOUNTING:
1252 case MOUNT_REMOUNTING_SIGKILL:
1253 case MOUNT_REMOUNTING_SIGTERM:
1254
1255 m->reload_result = f;
1256 if (m->from_proc_self_mountinfo)
1257 mount_enter_mounted(m, MOUNT_SUCCESS);
1258 else
1259 mount_enter_dead(m, MOUNT_SUCCESS);
1260
1261 break;
1262
1263 case MOUNT_UNMOUNTING:
1264 case MOUNT_UNMOUNTING_SIGKILL:
1265 case MOUNT_UNMOUNTING_SIGTERM:
1266
1267 if (f == MOUNT_SUCCESS) {
1268
1269 if (m->from_proc_self_mountinfo) {
1270
1271 /* Still a mount point? If so, let's
1272 * try again. Most likely there were
1273 * multiple mount points stacked on
1274 * top of each other. Note that due to
1275 * the io event priority logic we can
1276 * be sure the new mountinfo is loaded
1277 * before we process the SIGCHLD for
1278 * the mount command. */
1279
1280 if (m->n_retry_umount < RETRY_UMOUNT_MAX) {
1281 log_unit_debug(u, "Mount still present, trying again.");
1282 m->n_retry_umount++;
1283 mount_enter_unmounting(m);
1284 } else {
1285 log_unit_debug(u, "Mount still present after %u attempts to unmount, giving up.", m->n_retry_umount);
1286 mount_enter_mounted(m, f);
1287 }
1288 } else
1289 mount_enter_dead(m, f);
1290
1291 } else if (m->from_proc_self_mountinfo)
1292 mount_enter_mounted(m, f);
1293 else
1294 mount_enter_dead(m, f);
1295 break;
1296
1297 default:
1298 assert_not_reached("Uh, control process died at wrong time.");
1299 }
1300
1301 /* Notify clients about changed exit status */
1302 unit_add_to_dbus_queue(u);
1303 }
1304
1305 static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
1306 Mount *m = MOUNT(userdata);
1307
1308 assert(m);
1309 assert(m->timer_event_source == source);
1310
1311 switch (m->state) {
1312
1313 case MOUNT_MOUNTING:
1314 case MOUNT_MOUNTING_DONE:
1315 log_unit_warning(UNIT(m), "Mounting timed out. Stopping.");
1316 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1317 break;
1318
1319 case MOUNT_REMOUNTING:
1320 log_unit_warning(UNIT(m), "Remounting timed out. Stopping.");
1321 m->reload_result = MOUNT_FAILURE_TIMEOUT;
1322 mount_enter_mounted(m, MOUNT_SUCCESS);
1323 break;
1324
1325 case MOUNT_UNMOUNTING:
1326 log_unit_warning(UNIT(m), "Unmounting timed out. Stopping.");
1327 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1328 break;
1329
1330 case MOUNT_MOUNTING_SIGTERM:
1331 if (m->kill_context.send_sigkill) {
1332 log_unit_warning(UNIT(m), "Mounting timed out. Killing.");
1333 mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
1334 } else {
1335 log_unit_warning(UNIT(m), "Mounting timed out. Skipping SIGKILL. Ignoring.");
1336
1337 if (m->from_proc_self_mountinfo)
1338 mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
1339 else
1340 mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
1341 }
1342 break;
1343
1344 case MOUNT_REMOUNTING_SIGTERM:
1345 if (m->kill_context.send_sigkill) {
1346 log_unit_warning(UNIT(m), "Remounting timed out. Killing.");
1347 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
1348 } else {
1349 log_unit_warning(UNIT(m), "Remounting timed out. Skipping SIGKILL. Ignoring.");
1350
1351 if (m->from_proc_self_mountinfo)
1352 mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
1353 else
1354 mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
1355 }
1356 break;
1357
1358 case MOUNT_UNMOUNTING_SIGTERM:
1359 if (m->kill_context.send_sigkill) {
1360 log_unit_warning(UNIT(m), "Unmounting timed out. Killing.");
1361 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
1362 } else {
1363 log_unit_warning(UNIT(m), "Unmounting timed out. Skipping SIGKILL. Ignoring.");
1364
1365 if (m->from_proc_self_mountinfo)
1366 mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
1367 else
1368 mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
1369 }
1370 break;
1371
1372 case MOUNT_MOUNTING_SIGKILL:
1373 case MOUNT_REMOUNTING_SIGKILL:
1374 case MOUNT_UNMOUNTING_SIGKILL:
1375 log_unit_warning(UNIT(m),"Mount process still around after SIGKILL. Ignoring.");
1376
1377 if (m->from_proc_self_mountinfo)
1378 mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
1379 else
1380 mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
1381 break;
1382
1383 default:
1384 assert_not_reached("Timeout at wrong time.");
1385 }
1386
1387 return 0;
1388 }
1389
1390 typedef struct {
1391 bool is_mounted;
1392 bool just_mounted;
1393 bool just_changed;
1394 } MountSetupFlags;
1395
1396 static int mount_setup_new_unit(
1397 Unit *u,
1398 const char *what,
1399 const char *where,
1400 const char *options,
1401 const char *fstype,
1402 MountSetupFlags *flags) {
1403
1404 MountParameters *p;
1405
1406 assert(u);
1407 assert(flags);
1408
1409 u->source_path = strdup("/proc/self/mountinfo");
1410 MOUNT(u)->where = strdup(where);
1411 if (!u->source_path || !MOUNT(u)->where)
1412 return -ENOMEM;
1413
1414 /* Make sure to initialize those fields before mount_is_extrinsic(). */
1415 MOUNT(u)->from_proc_self_mountinfo = true;
1416 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1417
1418 p->what = strdup(what);
1419 p->options = strdup(options);
1420 p->fstype = strdup(fstype);
1421 if (!p->what || !p->options || !p->fstype)
1422 return -ENOMEM;
1423
1424 if (!mount_is_extrinsic(MOUNT(u))) {
1425 const char *target;
1426 int r;
1427
1428 target = mount_is_network(p) ? SPECIAL_REMOTE_FS_TARGET : SPECIAL_LOCAL_FS_TARGET;
1429 r = unit_add_dependency_by_name(u, UNIT_BEFORE, target, NULL, true);
1430 if (r < 0)
1431 return r;
1432
1433 r = unit_add_dependency_by_name(u, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true);
1434 if (r < 0)
1435 return r;
1436 }
1437
1438 unit_add_to_load_queue(u);
1439 flags->is_mounted = true;
1440 flags->just_mounted = true;
1441 flags->just_changed = true;
1442
1443 return 0;
1444 }
1445
1446 static int mount_setup_existing_unit(
1447 Unit *u,
1448 const char *what,
1449 const char *where,
1450 const char *options,
1451 const char *fstype,
1452 MountSetupFlags *flags) {
1453
1454 MountParameters *p;
1455 bool load_extras = false;
1456 int r1, r2, r3;
1457
1458 assert(u);
1459 assert(flags);
1460
1461 if (!MOUNT(u)->where) {
1462 MOUNT(u)->where = strdup(where);
1463 if (!MOUNT(u)->where)
1464 return -ENOMEM;
1465 }
1466
1467 /* Make sure to initialize those fields before mount_is_extrinsic(). */
1468 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1469
1470 r1 = free_and_strdup(&p->what, what);
1471 r2 = free_and_strdup(&p->options, options);
1472 r3 = free_and_strdup(&p->fstype, fstype);
1473 if (r1 < 0 || r2 < 0 || r3 < 0)
1474 return -ENOMEM;
1475
1476 flags->just_changed = r1 > 0 || r2 > 0 || r3 > 0;
1477 flags->is_mounted = true;
1478 flags->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
1479
1480 MOUNT(u)->from_proc_self_mountinfo = true;
1481
1482 if (!mount_is_extrinsic(MOUNT(u)) && mount_is_network(p)) {
1483 /* _netdev option may have shown up late, or on a
1484 * remount. Add remote-fs dependencies, even though
1485 * local-fs ones may already be there.
1486 *
1487 * Note: due to a current limitation (we don't track
1488 * in the dependency "Set*" objects who created a
1489 * dependency), we can only add deps, never lose them,
1490 * until the next full daemon-reload. */
1491 unit_add_dependency_by_name(u, UNIT_BEFORE, SPECIAL_REMOTE_FS_TARGET, NULL, true);
1492 load_extras = true;
1493 }
1494
1495 if (u->load_state == UNIT_NOT_FOUND) {
1496 u->load_state = UNIT_LOADED;
1497 u->load_error = 0;
1498
1499 /* Load in the extras later on, after we
1500 * finished initialization of the unit */
1501
1502 /* FIXME: since we're going to load the unit later on, why setting load_extras=true ? */
1503 load_extras = true;
1504 flags->just_changed = true;
1505 }
1506
1507 if (load_extras)
1508 return mount_add_extras(MOUNT(u));
1509
1510 return 0;
1511 }
1512
1513 static int mount_setup_unit(
1514 Manager *m,
1515 const char *what,
1516 const char *where,
1517 const char *options,
1518 const char *fstype,
1519 bool set_flags) {
1520
1521 _cleanup_free_ char *e = NULL;
1522 MountSetupFlags flags;
1523 Unit *u;
1524 int r;
1525
1526 assert(m);
1527 assert(what);
1528 assert(where);
1529 assert(options);
1530 assert(fstype);
1531
1532 /* Ignore API mount points. They should never be referenced in
1533 * dependencies ever. */
1534 if (mount_point_is_api(where) || mount_point_ignore(where))
1535 return 0;
1536
1537 if (streq(fstype, "autofs"))
1538 return 0;
1539
1540 /* probably some kind of swap, ignore */
1541 if (!is_path(where))
1542 return 0;
1543
1544 r = unit_name_from_path(where, ".mount", &e);
1545 if (r < 0)
1546 return r;
1547
1548 u = manager_get_unit(m, e);
1549 if (!u) {
1550 /* First time we see this mount point meaning that it's
1551 * not been initiated by a mount unit but rather by the
1552 * sysadmin having called mount(8) directly. */
1553 r = unit_new_for_name(m, sizeof(Mount), e, &u);
1554 if (r < 0)
1555 goto fail;
1556
1557 r = mount_setup_new_unit(u, what, where, options, fstype, &flags);
1558 if (r < 0)
1559 unit_free(u);
1560 } else
1561 r = mount_setup_existing_unit(u, what, where, options, fstype, &flags);
1562
1563 if (r < 0)
1564 goto fail;
1565
1566 if (set_flags) {
1567 MOUNT(u)->is_mounted = flags.is_mounted;
1568 MOUNT(u)->just_mounted = flags.just_mounted;
1569 MOUNT(u)->just_changed = flags.just_changed;
1570 }
1571
1572 if (flags.just_changed)
1573 unit_add_to_dbus_queue(u);
1574
1575 return 0;
1576 fail:
1577 log_warning_errno(r, "Failed to set up mount unit: %m");
1578 return r;
1579 }
1580
1581 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1582 _cleanup_(mnt_free_tablep) struct libmnt_table *t = NULL;
1583 _cleanup_(mnt_free_iterp) struct libmnt_iter *i = NULL;
1584 int r = 0;
1585
1586 assert(m);
1587
1588 t = mnt_new_table();
1589 if (!t)
1590 return log_oom();
1591
1592 i = mnt_new_iter(MNT_ITER_FORWARD);
1593 if (!i)
1594 return log_oom();
1595
1596 r = mnt_table_parse_mtab(t, NULL);
1597 if (r < 0)
1598 return log_error_errno(r, "Failed to parse /proc/self/mountinfo: %m");
1599
1600 r = 0;
1601 for (;;) {
1602 const char *device, *path, *options, *fstype;
1603 _cleanup_free_ char *d = NULL, *p = NULL;
1604 struct libmnt_fs *fs;
1605 int k;
1606
1607 k = mnt_table_next_fs(t, i, &fs);
1608 if (k == 1)
1609 break;
1610 if (k < 0)
1611 return log_error_errno(k, "Failed to get next entry from /proc/self/mountinfo: %m");
1612
1613 device = mnt_fs_get_source(fs);
1614 path = mnt_fs_get_target(fs);
1615 options = mnt_fs_get_options(fs);
1616 fstype = mnt_fs_get_fstype(fs);
1617
1618 if (!device || !path)
1619 continue;
1620
1621 if (cunescape(device, UNESCAPE_RELAX, &d) < 0)
1622 return log_oom();
1623
1624 if (cunescape(path, UNESCAPE_RELAX, &p) < 0)
1625 return log_oom();
1626
1627 (void) device_found_node(m, d, true, DEVICE_FOUND_MOUNT, set_flags);
1628
1629 k = mount_setup_unit(m, d, p, options, fstype, set_flags);
1630 if (r == 0 && k < 0)
1631 r = k;
1632 }
1633
1634 return r;
1635 }
1636
1637 static void mount_shutdown(Manager *m) {
1638
1639 assert(m);
1640
1641 m->mount_event_source = sd_event_source_unref(m->mount_event_source);
1642
1643 mnt_unref_monitor(m->mount_monitor);
1644 m->mount_monitor = NULL;
1645 }
1646
1647 static int mount_get_timeout(Unit *u, usec_t *timeout) {
1648 Mount *m = MOUNT(u);
1649 usec_t t;
1650 int r;
1651
1652 if (!m->timer_event_source)
1653 return 0;
1654
1655 r = sd_event_source_get_time(m->timer_event_source, &t);
1656 if (r < 0)
1657 return r;
1658 if (t == USEC_INFINITY)
1659 return 0;
1660
1661 *timeout = t;
1662 return 1;
1663 }
1664
1665 static int synthesize_root_mount(Manager *m) {
1666 Unit *u;
1667 int r;
1668
1669 assert(m);
1670
1671 /* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's
1672 * unconditionally synthesize it here and mark it as perpetual. */
1673
1674 u = manager_get_unit(m, SPECIAL_ROOT_MOUNT);
1675 if (!u) {
1676 r = unit_new_for_name(m, sizeof(Mount), SPECIAL_ROOT_MOUNT, &u);
1677 if (r < 0)
1678 return log_error_errno(r, "Failed to allocate the special " SPECIAL_ROOT_MOUNT " unit: %m");
1679 }
1680
1681 u->perpetual = true;
1682 MOUNT(u)->deserialized_state = MOUNT_MOUNTED;
1683
1684 unit_add_to_load_queue(u);
1685 unit_add_to_dbus_queue(u);
1686
1687 return 0;
1688 }
1689
1690 static bool mount_is_mounted(Mount *m) {
1691 assert(m);
1692
1693 return UNIT(m)->perpetual || m->is_mounted;
1694 }
1695
1696 static void mount_enumerate(Manager *m) {
1697 int r;
1698
1699 assert(m);
1700
1701 r = synthesize_root_mount(m);
1702 if (r < 0)
1703 goto fail;
1704
1705 mnt_init_debug(0);
1706
1707 if (!m->mount_monitor) {
1708 int fd;
1709
1710 m->mount_monitor = mnt_new_monitor();
1711 if (!m->mount_monitor) {
1712 log_oom();
1713 goto fail;
1714 }
1715
1716 r = mnt_monitor_enable_kernel(m->mount_monitor, 1);
1717 if (r < 0) {
1718 log_error_errno(r, "Failed to enable watching of kernel mount events: %m");
1719 goto fail;
1720 }
1721
1722 r = mnt_monitor_enable_userspace(m->mount_monitor, 1, NULL);
1723 if (r < 0) {
1724 log_error_errno(r, "Failed to enable watching of userspace mount events: %m");
1725 goto fail;
1726 }
1727
1728 /* mnt_unref_monitor() will close the fd */
1729 fd = r = mnt_monitor_get_fd(m->mount_monitor);
1730 if (r < 0) {
1731 log_error_errno(r, "Failed to acquire watch file descriptor: %m");
1732 goto fail;
1733 }
1734
1735 r = sd_event_add_io(m->event, &m->mount_event_source, fd, EPOLLIN, mount_dispatch_io, m);
1736 if (r < 0) {
1737 log_error_errno(r, "Failed to watch mount file descriptor: %m");
1738 goto fail;
1739 }
1740
1741 r = sd_event_source_set_priority(m->mount_event_source, -10);
1742 if (r < 0) {
1743 log_error_errno(r, "Failed to adjust mount watch priority: %m");
1744 goto fail;
1745 }
1746
1747 (void) sd_event_source_set_description(m->mount_event_source, "mount-monitor-dispatch");
1748 }
1749
1750 r = mount_load_proc_self_mountinfo(m, false);
1751 if (r < 0)
1752 goto fail;
1753
1754 return;
1755
1756 fail:
1757 mount_shutdown(m);
1758 }
1759
1760 static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
1761 _cleanup_set_free_ Set *around = NULL, *gone = NULL;
1762 Manager *m = userdata;
1763 const char *what;
1764 Iterator i;
1765 Unit *u;
1766 int r;
1767
1768 assert(m);
1769 assert(revents & EPOLLIN);
1770
1771 if (fd == mnt_monitor_get_fd(m->mount_monitor)) {
1772 bool rescan = false;
1773
1774 /* Drain all events and verify that the event is valid.
1775 *
1776 * Note that libmount also monitors /run/mount mkdir if the
1777 * directory does not exist yet. The mkdir may generate event
1778 * which is irrelevant for us.
1779 *
1780 * error: r < 0; valid: r == 0, false positive: rc == 1 */
1781 do {
1782 r = mnt_monitor_next_change(m->mount_monitor, NULL, NULL);
1783 if (r == 0)
1784 rescan = true;
1785 else if (r < 0)
1786 return log_error_errno(r, "Failed to drain libmount events");
1787 } while (r == 0);
1788
1789 log_debug("libmount event [rescan: %s]", yes_no(rescan));
1790 if (!rescan)
1791 return 0;
1792 }
1793
1794 r = mount_load_proc_self_mountinfo(m, true);
1795 if (r < 0) {
1796 /* Reset flags, just in case, for later calls */
1797 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1798 Mount *mount = MOUNT(u);
1799
1800 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1801 }
1802
1803 return 0;
1804 }
1805
1806 manager_dispatch_load_queue(m);
1807
1808 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1809 Mount *mount = MOUNT(u);
1810
1811 if (!mount_is_mounted(mount)) {
1812
1813 /* A mount point is not around right now. It
1814 * might be gone, or might never have
1815 * existed. */
1816
1817 if (mount->from_proc_self_mountinfo &&
1818 mount->parameters_proc_self_mountinfo.what) {
1819
1820 /* Remember that this device might just have disappeared */
1821 if (set_ensure_allocated(&gone, &string_hash_ops) < 0 ||
1822 set_put(gone, mount->parameters_proc_self_mountinfo.what) < 0)
1823 log_oom(); /* we don't care too much about OOM here... */
1824 }
1825
1826 mount->from_proc_self_mountinfo = false;
1827
1828 switch (mount->state) {
1829
1830 case MOUNT_MOUNTED:
1831 /* This has just been unmounted by
1832 * somebody else, follow the state
1833 * change. */
1834 mount->result = MOUNT_SUCCESS; /* make sure we forget any earlier umount failures */
1835 mount_enter_dead(mount, MOUNT_SUCCESS);
1836 break;
1837
1838 default:
1839 break;
1840 }
1841
1842 } else if (mount->just_mounted || mount->just_changed) {
1843
1844 /* A mount point was added or changed */
1845
1846 switch (mount->state) {
1847
1848 case MOUNT_DEAD:
1849 case MOUNT_FAILED:
1850
1851 /* This has just been mounted by somebody else, follow the state change, but let's
1852 * generate a new invocation ID for this implicitly and automatically. */
1853 (void) unit_acquire_invocation_id(UNIT(mount));
1854 mount_enter_mounted(mount, MOUNT_SUCCESS);
1855 break;
1856
1857 case MOUNT_MOUNTING:
1858 mount_set_state(mount, MOUNT_MOUNTING_DONE);
1859 break;
1860
1861 default:
1862 /* Nothing really changed, but let's
1863 * issue an notification call
1864 * nonetheless, in case somebody is
1865 * waiting for this. (e.g. file system
1866 * ro/rw remounts.) */
1867 mount_set_state(mount, mount->state);
1868 break;
1869 }
1870 }
1871
1872 if (mount_is_mounted(mount) &&
1873 mount->from_proc_self_mountinfo &&
1874 mount->parameters_proc_self_mountinfo.what) {
1875
1876 if (set_ensure_allocated(&around, &string_hash_ops) < 0 ||
1877 set_put(around, mount->parameters_proc_self_mountinfo.what) < 0)
1878 log_oom();
1879 }
1880
1881 /* Reset the flags for later calls */
1882 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1883 }
1884
1885 SET_FOREACH(what, gone, i) {
1886 if (set_contains(around, what))
1887 continue;
1888
1889 /* Let the device units know that the device is no longer mounted */
1890 (void) device_found_node(m, what, false, DEVICE_FOUND_MOUNT, true);
1891 }
1892
1893 return 0;
1894 }
1895
1896 static void mount_reset_failed(Unit *u) {
1897 Mount *m = MOUNT(u);
1898
1899 assert(m);
1900
1901 if (m->state == MOUNT_FAILED)
1902 mount_set_state(m, MOUNT_DEAD);
1903
1904 m->result = MOUNT_SUCCESS;
1905 m->reload_result = MOUNT_SUCCESS;
1906 }
1907
1908 static int mount_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
1909 return unit_kill_common(u, who, signo, -1, MOUNT(u)->control_pid, error);
1910 }
1911
1912 static int mount_control_pid(Unit *u) {
1913 Mount *m = MOUNT(u);
1914
1915 assert(m);
1916
1917 return m->control_pid;
1918 }
1919
1920 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1921 [MOUNT_EXEC_MOUNT] = "ExecMount",
1922 [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1923 [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1924 };
1925
1926 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1927
1928 static const char* const mount_result_table[_MOUNT_RESULT_MAX] = {
1929 [MOUNT_SUCCESS] = "success",
1930 [MOUNT_FAILURE_RESOURCES] = "resources",
1931 [MOUNT_FAILURE_TIMEOUT] = "timeout",
1932 [MOUNT_FAILURE_EXIT_CODE] = "exit-code",
1933 [MOUNT_FAILURE_SIGNAL] = "signal",
1934 [MOUNT_FAILURE_CORE_DUMP] = "core-dump",
1935 [MOUNT_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
1936 };
1937
1938 DEFINE_STRING_TABLE_LOOKUP(mount_result, MountResult);
1939
1940 const UnitVTable mount_vtable = {
1941 .object_size = sizeof(Mount),
1942 .exec_context_offset = offsetof(Mount, exec_context),
1943 .cgroup_context_offset = offsetof(Mount, cgroup_context),
1944 .kill_context_offset = offsetof(Mount, kill_context),
1945 .exec_runtime_offset = offsetof(Mount, exec_runtime),
1946 .dynamic_creds_offset = offsetof(Mount, dynamic_creds),
1947
1948 .sections =
1949 "Unit\0"
1950 "Mount\0"
1951 "Install\0",
1952 .private_section = "Mount",
1953
1954 .init = mount_init,
1955 .load = mount_load,
1956 .done = mount_done,
1957
1958 .coldplug = mount_coldplug,
1959
1960 .dump = mount_dump,
1961
1962 .start = mount_start,
1963 .stop = mount_stop,
1964 .reload = mount_reload,
1965
1966 .kill = mount_kill,
1967
1968 .serialize = mount_serialize,
1969 .deserialize_item = mount_deserialize_item,
1970
1971 .active_state = mount_active_state,
1972 .sub_state_to_string = mount_sub_state_to_string,
1973
1974 .check_gc = mount_check_gc,
1975
1976 .sigchld_event = mount_sigchld_event,
1977
1978 .reset_failed = mount_reset_failed,
1979
1980 .control_pid = mount_control_pid,
1981
1982 .bus_vtable = bus_mount_vtable,
1983 .bus_set_property = bus_mount_set_property,
1984 .bus_commit_properties = bus_mount_commit_properties,
1985
1986 .get_timeout = mount_get_timeout,
1987
1988 .can_transient = true,
1989
1990 .enumerate = mount_enumerate,
1991 .shutdown = mount_shutdown,
1992
1993 .status_message_formats = {
1994 .starting_stopping = {
1995 [0] = "Mounting %s...",
1996 [1] = "Unmounting %s...",
1997 },
1998 .finished_start_job = {
1999 [JOB_DONE] = "Mounted %s.",
2000 [JOB_FAILED] = "Failed to mount %s.",
2001 [JOB_TIMEOUT] = "Timed out mounting %s.",
2002 },
2003 .finished_stop_job = {
2004 [JOB_DONE] = "Unmounted %s.",
2005 [JOB_FAILED] = "Failed unmounting %s.",
2006 [JOB_TIMEOUT] = "Timed out unmounting %s.",
2007 },
2008 },
2009 };
Unnamed repository; edit this file 'description' to name the repository.