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