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mount: remove unnecessary initialization of device_wants_mount and 'if'
[thirdparty/systemd.git] / src / core / mount.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <errno.h>
4 #include <signal.h>
5 #include <stdio.h>
6 #include <sys/epoll.h>
7
8 #include <libmount.h>
9
10 #include "sd-messages.h"
11
12 #include "alloc-util.h"
13 #include "dbus-mount.h"
14 #include "dbus-unit.h"
15 #include "device.h"
16 #include "escape.h"
17 #include "exit-status.h"
18 #include "format-util.h"
19 #include "fstab-util.h"
20 #include "log.h"
21 #include "manager.h"
22 #include "mkdir.h"
23 #include "mount-setup.h"
24 #include "mount.h"
25 #include "mountpoint-util.h"
26 #include "parse-util.h"
27 #include "path-util.h"
28 #include "process-util.h"
29 #include "serialize.h"
30 #include "special.h"
31 #include "string-table.h"
32 #include "string-util.h"
33 #include "strv.h"
34 #include "unit-name.h"
35 #include "unit.h"
36
37 #define RETRY_UMOUNT_MAX 32
38
39 DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_table*, mnt_free_table);
40 DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_iter*, mnt_free_iter);
41
42 static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
43 [MOUNT_DEAD] = UNIT_INACTIVE,
44 [MOUNT_MOUNTING] = UNIT_ACTIVATING,
45 [MOUNT_MOUNTING_DONE] = UNIT_ACTIVATING,
46 [MOUNT_MOUNTED] = UNIT_ACTIVE,
47 [MOUNT_REMOUNTING] = UNIT_RELOADING,
48 [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
49 [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING,
50 [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING,
51 [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
52 [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
53 [MOUNT_FAILED] = UNIT_FAILED
54 };
55
56 static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
57 static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
58
59 static bool MOUNT_STATE_WITH_PROCESS(MountState state) {
60 return IN_SET(state,
61 MOUNT_MOUNTING,
62 MOUNT_MOUNTING_DONE,
63 MOUNT_REMOUNTING,
64 MOUNT_REMOUNTING_SIGTERM,
65 MOUNT_REMOUNTING_SIGKILL,
66 MOUNT_UNMOUNTING,
67 MOUNT_UNMOUNTING_SIGTERM,
68 MOUNT_UNMOUNTING_SIGKILL);
69 }
70
71 static bool mount_is_network(const MountParameters *p) {
72 assert(p);
73
74 if (fstab_test_option(p->options, "_netdev\0"))
75 return true;
76
77 if (p->fstype && fstype_is_network(p->fstype))
78 return true;
79
80 return false;
81 }
82
83 static bool mount_is_loop(const MountParameters *p) {
84 assert(p);
85
86 if (fstab_test_option(p->options, "loop\0"))
87 return true;
88
89 return false;
90 }
91
92 static bool mount_is_bind(const MountParameters *p) {
93 assert(p);
94
95 if (fstab_test_option(p->options, "bind\0" "rbind\0"))
96 return true;
97
98 if (p->fstype && STR_IN_SET(p->fstype, "bind", "rbind"))
99 return true;
100
101 return false;
102 }
103
104 static bool mount_is_auto(const MountParameters *p) {
105 assert(p);
106
107 return !fstab_test_option(p->options, "noauto\0");
108 }
109
110 static bool mount_is_automount(const MountParameters *p) {
111 assert(p);
112
113 return fstab_test_option(p->options,
114 "comment=systemd.automount\0"
115 "x-systemd.automount\0");
116 }
117
118 static bool mount_is_bound_to_device(const Mount *m) {
119 const MountParameters *p;
120
121 if (m->from_fragment)
122 return true;
123
124 p = &m->parameters_proc_self_mountinfo;
125 return fstab_test_option(p->options, "x-systemd.device-bound\0");
126 }
127
128 static bool mount_needs_quota(const MountParameters *p) {
129 assert(p);
130
131 /* Quotas are not enabled on network filesystems, but we want them, for example, on storage connected via
132 * iscsi. We hence don't use mount_is_network() here, as that would also return true for _netdev devices. */
133 if (p->fstype && fstype_is_network(p->fstype))
134 return false;
135
136 if (mount_is_bind(p))
137 return false;
138
139 return fstab_test_option(p->options,
140 "usrquota\0" "grpquota\0" "quota\0" "usrjquota\0" "grpjquota\0");
141 }
142
143 static void mount_init(Unit *u) {
144 Mount *m = MOUNT(u);
145
146 assert(u);
147 assert(u->load_state == UNIT_STUB);
148
149 m->timeout_usec = u->manager->default_timeout_start_usec;
150
151 m->exec_context.std_output = u->manager->default_std_output;
152 m->exec_context.std_error = u->manager->default_std_error;
153
154 m->directory_mode = 0755;
155
156 /* We need to make sure that /usr/bin/mount is always called
157 * in the same process group as us, so that the autofs kernel
158 * side doesn't send us another mount request while we are
159 * already trying to comply its last one. */
160 m->exec_context.same_pgrp = true;
161
162 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
163
164 u->ignore_on_isolate = true;
165 }
166
167 static int mount_arm_timer(Mount *m, usec_t usec) {
168 int r;
169
170 assert(m);
171
172 if (m->timer_event_source) {
173 r = sd_event_source_set_time(m->timer_event_source, usec);
174 if (r < 0)
175 return r;
176
177 return sd_event_source_set_enabled(m->timer_event_source, SD_EVENT_ONESHOT);
178 }
179
180 if (usec == USEC_INFINITY)
181 return 0;
182
183 r = sd_event_add_time(
184 UNIT(m)->manager->event,
185 &m->timer_event_source,
186 CLOCK_MONOTONIC,
187 usec, 0,
188 mount_dispatch_timer, m);
189 if (r < 0)
190 return r;
191
192 (void) sd_event_source_set_description(m->timer_event_source, "mount-timer");
193
194 return 0;
195 }
196
197 static void mount_unwatch_control_pid(Mount *m) {
198 assert(m);
199
200 if (m->control_pid <= 0)
201 return;
202
203 unit_unwatch_pid(UNIT(m), m->control_pid);
204 m->control_pid = 0;
205 }
206
207 static void mount_parameters_done(MountParameters *p) {
208 assert(p);
209
210 p->what = mfree(p->what);
211 p->options = mfree(p->options);
212 p->fstype = mfree(p->fstype);
213 }
214
215 static void mount_done(Unit *u) {
216 Mount *m = MOUNT(u);
217
218 assert(m);
219
220 m->where = mfree(m->where);
221
222 mount_parameters_done(&m->parameters_proc_self_mountinfo);
223 mount_parameters_done(&m->parameters_fragment);
224
225 m->exec_runtime = exec_runtime_unref(m->exec_runtime, false);
226 exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
227 m->control_command = NULL;
228
229 dynamic_creds_unref(&m->dynamic_creds);
230
231 mount_unwatch_control_pid(m);
232
233 m->timer_event_source = sd_event_source_unref(m->timer_event_source);
234 }
235
236 _pure_ static MountParameters* get_mount_parameters_fragment(Mount *m) {
237 assert(m);
238
239 if (m->from_fragment)
240 return &m->parameters_fragment;
241
242 return NULL;
243 }
244
245 _pure_ static MountParameters* get_mount_parameters(Mount *m) {
246 assert(m);
247
248 if (m->from_proc_self_mountinfo)
249 return &m->parameters_proc_self_mountinfo;
250
251 return get_mount_parameters_fragment(m);
252 }
253
254 static int mount_add_mount_dependencies(Mount *m) {
255 MountParameters *pm;
256 Unit *other;
257 Iterator i;
258 Set *s;
259 int r;
260
261 assert(m);
262
263 if (!path_equal(m->where, "/")) {
264 _cleanup_free_ char *parent = NULL;
265
266 /* Adds in links to other mount points that might lie further up in the hierarchy */
267
268 parent = dirname_malloc(m->where);
269 if (!parent)
270 return -ENOMEM;
271
272 r = unit_require_mounts_for(UNIT(m), parent, UNIT_DEPENDENCY_IMPLICIT);
273 if (r < 0)
274 return r;
275 }
276
277 /* Adds in dependencies to other mount points that might be needed for the source path (if this is a bind mount
278 * or a loop mount) to be available. */
279 pm = get_mount_parameters_fragment(m);
280 if (pm && pm->what &&
281 path_is_absolute(pm->what) &&
282 (mount_is_bind(pm) || mount_is_loop(pm) || !mount_is_network(pm))) {
283
284 r = unit_require_mounts_for(UNIT(m), pm->what, UNIT_DEPENDENCY_FILE);
285 if (r < 0)
286 return r;
287 }
288
289 /* Adds in dependencies to other units that use this path or paths further down in the hierarchy */
290 s = manager_get_units_requiring_mounts_for(UNIT(m)->manager, m->where);
291 SET_FOREACH(other, s, i) {
292
293 if (other->load_state != UNIT_LOADED)
294 continue;
295
296 if (other == UNIT(m))
297 continue;
298
299 r = unit_add_dependency(other, UNIT_AFTER, UNIT(m), true, UNIT_DEPENDENCY_PATH);
300 if (r < 0)
301 return r;
302
303 if (UNIT(m)->fragment_path) {
304 /* If we have fragment configuration, then make this dependency required */
305 r = unit_add_dependency(other, UNIT_REQUIRES, UNIT(m), true, UNIT_DEPENDENCY_PATH);
306 if (r < 0)
307 return r;
308 }
309 }
310
311 return 0;
312 }
313
314 static int mount_add_device_dependencies(Mount *m) {
315 bool device_wants_mount;
316 UnitDependencyMask mask;
317 MountParameters *p;
318 UnitDependency dep;
319 int r;
320
321 assert(m);
322
323 p = get_mount_parameters(m);
324 if (!p)
325 return 0;
326
327 if (!p->what)
328 return 0;
329
330 if (mount_is_bind(p))
331 return 0;
332
333 if (!is_device_path(p->what))
334 return 0;
335
336 /* /dev/root is a really weird thing, it's not a real device,
337 * but just a path the kernel exports for the root file system
338 * specified on the kernel command line. Ignore it here. */
339 if (path_equal(p->what, "/dev/root"))
340 return 0;
341
342 if (path_equal(m->where, "/"))
343 return 0;
344
345 device_wants_mount =
346 mount_is_auto(p) && !mount_is_automount(p) && MANAGER_IS_SYSTEM(UNIT(m)->manager);
347
348 /* Mount units from /proc/self/mountinfo are not bound to devices
349 * by default since they're subject to races when devices are
350 * unplugged. But the user can still force this dep with an
351 * appropriate option (or udev property) so the mount units are
352 * automatically stopped when the device disappears suddenly. */
353 dep = mount_is_bound_to_device(m) ? UNIT_BINDS_TO : UNIT_REQUIRES;
354
355 mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT;
356
357 r = unit_add_node_dependency(UNIT(m), p->what, device_wants_mount, dep, mask);
358 if (r < 0)
359 return r;
360
361 return 0;
362 }
363
364 static int mount_add_quota_dependencies(Mount *m) {
365 UnitDependencyMask mask;
366 MountParameters *p;
367 int r;
368
369 assert(m);
370
371 if (!MANAGER_IS_SYSTEM(UNIT(m)->manager))
372 return 0;
373
374 p = get_mount_parameters_fragment(m);
375 if (!p)
376 return 0;
377
378 if (!mount_needs_quota(p))
379 return 0;
380
381 mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT;
382
383 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, true, mask);
384 if (r < 0)
385 return r;
386
387 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, true, mask);
388 if (r < 0)
389 return r;
390
391 return 0;
392 }
393
394 static bool mount_is_extrinsic(Mount *m) {
395 MountParameters *p;
396 assert(m);
397
398 /* Returns true for all units that are "magic" and should be excluded from the usual start-up and shutdown
399 * dependencies. We call them "extrinsic" here, as they are generally mounted outside of the systemd dependency
400 * logic. We shouldn't attempt to manage them ourselves but it's fine if the user operates on them with us. */
401
402 if (!MANAGER_IS_SYSTEM(UNIT(m)->manager)) /* We only automatically manage mounts if we are in system mode */
403 return true;
404
405 if (PATH_IN_SET(m->where, /* Don't bother with the OS data itself */
406 "/",
407 "/usr"))
408 return true;
409
410 if (PATH_STARTSWITH_SET(m->where,
411 "/run/initramfs", /* This should stay around from before we boot until after we shutdown */
412 "/proc", /* All of this is API VFS */
413 "/sys", /* … dito … */
414 "/dev")) /* … dito … */
415 return true;
416
417 /* If this is an initrd mount, and we are not in the initrd, then leave this around forever, too. */
418 p = get_mount_parameters(m);
419 if (p && fstab_test_option(p->options, "x-initrd.mount\0") && !in_initrd())
420 return true;
421
422 return false;
423 }
424
425 static int mount_add_default_dependencies(Mount *m) {
426 UnitDependencyMask mask;
427 int r;
428 MountParameters *p;
429 const char *after;
430
431 assert(m);
432
433 if (!UNIT(m)->default_dependencies)
434 return 0;
435
436 /* We do not add any default dependencies to /, /usr or /run/initramfs/, since they are guaranteed to stay
437 * mounted the whole time, since our system is on it. Also, don't bother with anything mounted below virtual
438 * file systems, it's also going to be virtual, and hence not worth the effort. */
439 if (mount_is_extrinsic(m))
440 return 0;
441
442 p = get_mount_parameters(m);
443 if (!p)
444 return 0;
445
446 mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_DEFAULT;
447
448 if (mount_is_network(p)) {
449 /* We order ourselves after network.target. This is
450 * primarily useful at shutdown: services that take
451 * down the network should order themselves before
452 * network.target, so that they are shut down only
453 * after this mount unit is stopped. */
454
455 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_NETWORK_TARGET, true, mask);
456 if (r < 0)
457 return r;
458
459 /* We pull in network-online.target, and order
460 * ourselves after it. This is useful at start-up to
461 * actively pull in tools that want to be started
462 * before we start mounting network file systems, and
463 * whose purpose it is to delay this until the network
464 * is "up". */
465
466 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_WANTS, UNIT_AFTER, SPECIAL_NETWORK_ONLINE_TARGET, true, mask);
467 if (r < 0)
468 return r;
469
470 after = SPECIAL_REMOTE_FS_PRE_TARGET;
471 } else
472 after = SPECIAL_LOCAL_FS_PRE_TARGET;
473
474 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, true, mask);
475 if (r < 0)
476 return r;
477
478 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, true, mask);
479 if (r < 0)
480 return r;
481
482 /* If this is a tmpfs mount then we have to unmount it before we try to deactivate swaps */
483 if (streq_ptr(p->fstype, "tmpfs")) {
484 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_SWAP_TARGET, true, mask);
485 if (r < 0)
486 return r;
487 }
488
489 return 0;
490 }
491
492 static int mount_verify(Mount *m) {
493 _cleanup_free_ char *e = NULL;
494 MountParameters *p;
495 int r;
496
497 assert(m);
498
499 if (UNIT(m)->load_state != UNIT_LOADED)
500 return 0;
501
502 if (!m->from_fragment && !m->from_proc_self_mountinfo && !UNIT(m)->perpetual)
503 return -ENOENT;
504
505 r = unit_name_from_path(m->where, ".mount", &e);
506 if (r < 0)
507 return log_unit_error_errno(UNIT(m), r, "Failed to generate unit name from mount path: %m");
508
509 if (!unit_has_name(UNIT(m), e)) {
510 log_unit_error(UNIT(m), "Where= setting doesn't match unit name. Refusing.");
511 return -ENOEXEC;
512 }
513
514 if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
515 log_unit_error(UNIT(m), "Cannot create mount unit for API file system %s. Refusing.", m->where);
516 return -ENOEXEC;
517 }
518
519 p = get_mount_parameters_fragment(m);
520 if (p && !p->what) {
521 log_unit_error(UNIT(m), "What= setting is missing. Refusing.");
522 return -ENOEXEC;
523 }
524
525 if (m->exec_context.pam_name && m->kill_context.kill_mode != KILL_CONTROL_GROUP) {
526 log_unit_error(UNIT(m), "Unit has PAM enabled. Kill mode must be set to control-group'. Refusing.");
527 return -ENOEXEC;
528 }
529
530 return 0;
531 }
532
533 static int mount_add_extras(Mount *m) {
534 Unit *u = UNIT(m);
535 int r;
536
537 assert(m);
538
539 if (u->fragment_path)
540 m->from_fragment = true;
541
542 if (!m->where) {
543 r = unit_name_to_path(u->id, &m->where);
544 if (r < 0)
545 return r;
546 }
547
548 path_simplify(m->where, false);
549
550 if (!u->description) {
551 r = unit_set_description(u, m->where);
552 if (r < 0)
553 return r;
554 }
555
556 r = mount_add_device_dependencies(m);
557 if (r < 0)
558 return r;
559
560 r = mount_add_mount_dependencies(m);
561 if (r < 0)
562 return r;
563
564 r = mount_add_quota_dependencies(m);
565 if (r < 0)
566 return r;
567
568 r = unit_patch_contexts(u);
569 if (r < 0)
570 return r;
571
572 r = unit_add_exec_dependencies(u, &m->exec_context);
573 if (r < 0)
574 return r;
575
576 r = unit_set_default_slice(u);
577 if (r < 0)
578 return r;
579
580 r = mount_add_default_dependencies(m);
581 if (r < 0)
582 return r;
583
584 return 0;
585 }
586
587 static int mount_load_root_mount(Unit *u) {
588 assert(u);
589
590 if (!unit_has_name(u, SPECIAL_ROOT_MOUNT))
591 return 0;
592
593 u->perpetual = true;
594 u->default_dependencies = false;
595
596 /* The stdio/kmsg bridge socket is on /, in order to avoid a dep loop, don't use kmsg logging for -.mount */
597 MOUNT(u)->exec_context.std_output = EXEC_OUTPUT_NULL;
598 MOUNT(u)->exec_context.std_input = EXEC_INPUT_NULL;
599
600 if (!u->description)
601 u->description = strdup("Root Mount");
602
603 return 1;
604 }
605
606 static int mount_load(Unit *u) {
607 Mount *m = MOUNT(u);
608 int r;
609
610 assert(u);
611 assert(u->load_state == UNIT_STUB);
612
613 r = mount_load_root_mount(u);
614 if (r < 0)
615 return r;
616
617 if (m->from_proc_self_mountinfo || u->perpetual)
618 r = unit_load_fragment_and_dropin_optional(u);
619 else
620 r = unit_load_fragment_and_dropin(u);
621 if (r < 0)
622 return r;
623
624 /* This is a new unit? Then let's add in some extras */
625 if (u->load_state == UNIT_LOADED) {
626 r = mount_add_extras(m);
627 if (r < 0)
628 return r;
629 }
630
631 return mount_verify(m);
632 }
633
634 static void mount_set_state(Mount *m, MountState state) {
635 MountState old_state;
636 assert(m);
637
638 if (m->state != state)
639 bus_unit_send_pending_change_signal(UNIT(m), false);
640
641 old_state = m->state;
642 m->state = state;
643
644 if (!MOUNT_STATE_WITH_PROCESS(state)) {
645 m->timer_event_source = sd_event_source_unref(m->timer_event_source);
646 mount_unwatch_control_pid(m);
647 m->control_command = NULL;
648 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
649 }
650
651 if (state != old_state)
652 log_unit_debug(UNIT(m), "Changed %s -> %s", mount_state_to_string(old_state), mount_state_to_string(state));
653
654 unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state],
655 m->reload_result == MOUNT_SUCCESS ? 0 : UNIT_NOTIFY_RELOAD_FAILURE);
656 }
657
658 static int mount_coldplug(Unit *u) {
659 Mount *m = MOUNT(u);
660 MountState new_state = MOUNT_DEAD;
661 int r;
662
663 assert(m);
664 assert(m->state == MOUNT_DEAD);
665
666 if (m->deserialized_state != m->state)
667 new_state = m->deserialized_state;
668 else if (m->from_proc_self_mountinfo)
669 new_state = MOUNT_MOUNTED;
670
671 if (new_state == m->state)
672 return 0;
673
674 if (m->control_pid > 0 &&
675 pid_is_unwaited(m->control_pid) &&
676 MOUNT_STATE_WITH_PROCESS(new_state)) {
677
678 r = unit_watch_pid(UNIT(m), m->control_pid);
679 if (r < 0)
680 return r;
681
682 r = mount_arm_timer(m, usec_add(u->state_change_timestamp.monotonic, m->timeout_usec));
683 if (r < 0)
684 return r;
685 }
686
687 if (!IN_SET(new_state, MOUNT_DEAD, MOUNT_FAILED)) {
688 (void) unit_setup_dynamic_creds(u);
689 (void) unit_setup_exec_runtime(u);
690 }
691
692 mount_set_state(m, new_state);
693 return 0;
694 }
695
696 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
697 char buf[FORMAT_TIMESPAN_MAX];
698 Mount *m = MOUNT(u);
699 MountParameters *p;
700
701 assert(m);
702 assert(f);
703
704 p = get_mount_parameters(m);
705
706 fprintf(f,
707 "%sMount State: %s\n"
708 "%sResult: %s\n"
709 "%sWhere: %s\n"
710 "%sWhat: %s\n"
711 "%sFile System Type: %s\n"
712 "%sOptions: %s\n"
713 "%sFrom /proc/self/mountinfo: %s\n"
714 "%sFrom fragment: %s\n"
715 "%sExtrinsic: %s\n"
716 "%sDirectoryMode: %04o\n"
717 "%sSloppyOptions: %s\n"
718 "%sLazyUnmount: %s\n"
719 "%sForceUnmount: %s\n"
720 "%sTimoutSec: %s\n",
721 prefix, mount_state_to_string(m->state),
722 prefix, mount_result_to_string(m->result),
723 prefix, m->where,
724 prefix, p ? strna(p->what) : "n/a",
725 prefix, p ? strna(p->fstype) : "n/a",
726 prefix, p ? strna(p->options) : "n/a",
727 prefix, yes_no(m->from_proc_self_mountinfo),
728 prefix, yes_no(m->from_fragment),
729 prefix, yes_no(mount_is_extrinsic(m)),
730 prefix, m->directory_mode,
731 prefix, yes_no(m->sloppy_options),
732 prefix, yes_no(m->lazy_unmount),
733 prefix, yes_no(m->force_unmount),
734 prefix, format_timespan(buf, sizeof(buf), m->timeout_usec, USEC_PER_SEC));
735
736 if (m->control_pid > 0)
737 fprintf(f,
738 "%sControl PID: "PID_FMT"\n",
739 prefix, m->control_pid);
740
741 exec_context_dump(&m->exec_context, f, prefix);
742 kill_context_dump(&m->kill_context, f, prefix);
743 cgroup_context_dump(&m->cgroup_context, f, prefix);
744 }
745
746 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
747
748 _cleanup_(exec_params_clear) ExecParameters exec_params = {
749 .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
750 .stdin_fd = -1,
751 .stdout_fd = -1,
752 .stderr_fd = -1,
753 .exec_fd = -1,
754 };
755 pid_t pid;
756 int r;
757
758 assert(m);
759 assert(c);
760 assert(_pid);
761
762 r = unit_prepare_exec(UNIT(m));
763 if (r < 0)
764 return r;
765
766 r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
767 if (r < 0)
768 return r;
769
770 r = unit_set_exec_params(UNIT(m), &exec_params);
771 if (r < 0)
772 return r;
773
774 r = exec_spawn(UNIT(m),
775 c,
776 &m->exec_context,
777 &exec_params,
778 m->exec_runtime,
779 &m->dynamic_creds,
780 &pid);
781 if (r < 0)
782 return r;
783
784 r = unit_watch_pid(UNIT(m), pid);
785 if (r < 0)
786 /* FIXME: we need to do something here */
787 return r;
788
789 *_pid = pid;
790
791 return 0;
792 }
793
794 static void mount_enter_dead(Mount *m, MountResult f) {
795 assert(m);
796
797 if (m->result == MOUNT_SUCCESS)
798 m->result = f;
799
800 unit_log_result(UNIT(m), m->result == MOUNT_SUCCESS, mount_result_to_string(m->result));
801 mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD);
802
803 m->exec_runtime = exec_runtime_unref(m->exec_runtime, true);
804
805 exec_context_destroy_runtime_directory(&m->exec_context, UNIT(m)->manager->prefix[EXEC_DIRECTORY_RUNTIME]);
806
807 unit_unref_uid_gid(UNIT(m), true);
808
809 dynamic_creds_destroy(&m->dynamic_creds);
810 }
811
812 static void mount_enter_mounted(Mount *m, MountResult f) {
813 assert(m);
814
815 if (m->result == MOUNT_SUCCESS)
816 m->result = f;
817
818 mount_set_state(m, MOUNT_MOUNTED);
819 }
820
821 static void mount_enter_dead_or_mounted(Mount *m, MountResult f) {
822 assert(m);
823
824 /* Enter DEAD or MOUNTED state, depending on what the kernel currently says about the mount point. We use this
825 * whenever we executed an operation, so that our internal state reflects what the kernel says again, after all
826 * ultimately we just mirror the kernel's internal state on this. */
827
828 if (m->from_proc_self_mountinfo)
829 mount_enter_mounted(m, f);
830 else
831 mount_enter_dead(m, f);
832 }
833
834 static int state_to_kill_operation(MountState state) {
835 switch (state) {
836
837 case MOUNT_REMOUNTING_SIGTERM:
838 case MOUNT_UNMOUNTING_SIGTERM:
839 return KILL_TERMINATE;
840
841 case MOUNT_REMOUNTING_SIGKILL:
842 case MOUNT_UNMOUNTING_SIGKILL:
843 return KILL_KILL;
844
845 default:
846 return _KILL_OPERATION_INVALID;
847 }
848 }
849
850 static void mount_enter_signal(Mount *m, MountState state, MountResult f) {
851 int r;
852
853 assert(m);
854
855 if (m->result == MOUNT_SUCCESS)
856 m->result = f;
857
858 r = unit_kill_context(
859 UNIT(m),
860 &m->kill_context,
861 state_to_kill_operation(state),
862 -1,
863 m->control_pid,
864 false);
865 if (r < 0)
866 goto fail;
867
868 if (r > 0) {
869 r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
870 if (r < 0)
871 goto fail;
872
873 mount_set_state(m, state);
874 } else if (state == MOUNT_REMOUNTING_SIGTERM && m->kill_context.send_sigkill)
875 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
876 else if (IN_SET(state, MOUNT_REMOUNTING_SIGTERM, MOUNT_REMOUNTING_SIGKILL))
877 mount_enter_mounted(m, MOUNT_SUCCESS);
878 else if (state == MOUNT_UNMOUNTING_SIGTERM && m->kill_context.send_sigkill)
879 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS);
880 else
881 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
882
883 return;
884
885 fail:
886 log_unit_warning_errno(UNIT(m), r, "Failed to kill processes: %m");
887 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
888 }
889
890 static void mount_enter_unmounting(Mount *m) {
891 int r;
892
893 assert(m);
894
895 /* Start counting our attempts */
896 if (!IN_SET(m->state,
897 MOUNT_UNMOUNTING,
898 MOUNT_UNMOUNTING_SIGTERM,
899 MOUNT_UNMOUNTING_SIGKILL))
900 m->n_retry_umount = 0;
901
902 m->control_command_id = MOUNT_EXEC_UNMOUNT;
903 m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
904
905 r = exec_command_set(m->control_command, UMOUNT_PATH, m->where, "-c", NULL);
906 if (r >= 0 && m->lazy_unmount)
907 r = exec_command_append(m->control_command, "-l", NULL);
908 if (r >= 0 && m->force_unmount)
909 r = exec_command_append(m->control_command, "-f", NULL);
910 if (r < 0)
911 goto fail;
912
913 mount_unwatch_control_pid(m);
914
915 r = mount_spawn(m, m->control_command, &m->control_pid);
916 if (r < 0)
917 goto fail;
918
919 mount_set_state(m, MOUNT_UNMOUNTING);
920
921 return;
922
923 fail:
924 log_unit_warning_errno(UNIT(m), r, "Failed to run 'umount' task: %m");
925 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
926 }
927
928 static void mount_enter_mounting(Mount *m) {
929 int r;
930 MountParameters *p;
931
932 assert(m);
933
934 r = unit_fail_if_noncanonical(UNIT(m), m->where);
935 if (r < 0)
936 goto fail;
937
938 (void) mkdir_p_label(m->where, m->directory_mode);
939
940 unit_warn_if_dir_nonempty(UNIT(m), m->where);
941
942 unit_warn_leftover_processes(UNIT(m));
943
944 m->control_command_id = MOUNT_EXEC_MOUNT;
945 m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
946
947 /* Create the source directory for bind-mounts if needed */
948 p = get_mount_parameters_fragment(m);
949 if (p && mount_is_bind(p))
950 (void) mkdir_p_label(p->what, m->directory_mode);
951
952 if (p) {
953 _cleanup_free_ char *opts = NULL;
954
955 r = fstab_filter_options(p->options, "nofail\0" "noauto\0" "auto\0", NULL, NULL, &opts);
956 if (r < 0)
957 goto fail;
958
959 r = exec_command_set(m->control_command, MOUNT_PATH, p->what, m->where, NULL);
960 if (r >= 0 && m->sloppy_options)
961 r = exec_command_append(m->control_command, "-s", NULL);
962 if (r >= 0 && p->fstype)
963 r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
964 if (r >= 0 && !isempty(opts))
965 r = exec_command_append(m->control_command, "-o", opts, NULL);
966 } else
967 r = -ENOENT;
968 if (r < 0)
969 goto fail;
970
971 mount_unwatch_control_pid(m);
972
973 r = mount_spawn(m, m->control_command, &m->control_pid);
974 if (r < 0)
975 goto fail;
976
977 mount_set_state(m, MOUNT_MOUNTING);
978
979 return;
980
981 fail:
982 log_unit_warning_errno(UNIT(m), r, "Failed to run 'mount' task: %m");
983 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
984 }
985
986 static void mount_set_reload_result(Mount *m, MountResult result) {
987 assert(m);
988
989 /* Only store the first error we encounter */
990 if (m->reload_result != MOUNT_SUCCESS)
991 return;
992
993 m->reload_result = result;
994 }
995
996 static void mount_enter_remounting(Mount *m) {
997 int r;
998 MountParameters *p;
999
1000 assert(m);
1001
1002 /* Reset reload result when we are about to start a new remount operation */
1003 m->reload_result = MOUNT_SUCCESS;
1004
1005 m->control_command_id = MOUNT_EXEC_REMOUNT;
1006 m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
1007
1008 p = get_mount_parameters_fragment(m);
1009 if (p) {
1010 const char *o;
1011
1012 if (p->options)
1013 o = strjoina("remount,", p->options);
1014 else
1015 o = "remount";
1016
1017 r = exec_command_set(m->control_command, MOUNT_PATH,
1018 p->what, m->where,
1019 "-o", o, NULL);
1020 if (r >= 0 && m->sloppy_options)
1021 r = exec_command_append(m->control_command, "-s", NULL);
1022 if (r >= 0 && p->fstype)
1023 r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
1024 } else
1025 r = -ENOENT;
1026 if (r < 0)
1027 goto fail;
1028
1029 mount_unwatch_control_pid(m);
1030
1031 r = mount_spawn(m, m->control_command, &m->control_pid);
1032 if (r < 0)
1033 goto fail;
1034
1035 mount_set_state(m, MOUNT_REMOUNTING);
1036
1037 return;
1038
1039 fail:
1040 log_unit_warning_errno(UNIT(m), r, "Failed to run 'remount' task: %m");
1041 mount_set_reload_result(m, MOUNT_FAILURE_RESOURCES);
1042 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1043 }
1044
1045 static int mount_start(Unit *u) {
1046 Mount *m = MOUNT(u);
1047 int r;
1048
1049 assert(m);
1050
1051 /* We cannot fulfill this request right now, try again later
1052 * please! */
1053 if (IN_SET(m->state,
1054 MOUNT_UNMOUNTING,
1055 MOUNT_UNMOUNTING_SIGTERM,
1056 MOUNT_UNMOUNTING_SIGKILL))
1057 return -EAGAIN;
1058
1059 /* Already on it! */
1060 if (m->state == MOUNT_MOUNTING)
1061 return 0;
1062
1063 assert(IN_SET(m->state, MOUNT_DEAD, MOUNT_FAILED));
1064
1065 r = unit_start_limit_test(u);
1066 if (r < 0) {
1067 mount_enter_dead(m, MOUNT_FAILURE_START_LIMIT_HIT);
1068 return r;
1069 }
1070
1071 r = unit_acquire_invocation_id(u);
1072 if (r < 0)
1073 return r;
1074
1075 m->result = MOUNT_SUCCESS;
1076 m->reload_result = MOUNT_SUCCESS;
1077 exec_command_reset_status_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
1078
1079 u->reset_accounting = true;
1080
1081 mount_enter_mounting(m);
1082 return 1;
1083 }
1084
1085 static int mount_stop(Unit *u) {
1086 Mount *m = MOUNT(u);
1087
1088 assert(m);
1089
1090 switch (m->state) {
1091
1092 case MOUNT_UNMOUNTING:
1093 case MOUNT_UNMOUNTING_SIGKILL:
1094 case MOUNT_UNMOUNTING_SIGTERM:
1095 /* Already on it */
1096 return 0;
1097
1098 case MOUNT_MOUNTING:
1099 case MOUNT_MOUNTING_DONE:
1100 case MOUNT_REMOUNTING:
1101 /* If we are still waiting for /bin/mount, we go directly into kill mode. */
1102 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_SUCCESS);
1103 return 0;
1104
1105 case MOUNT_REMOUNTING_SIGTERM:
1106 /* If we are already waiting for a hung remount, convert this to the matching unmounting state */
1107 mount_set_state(m, MOUNT_UNMOUNTING_SIGTERM);
1108 return 0;
1109
1110 case MOUNT_REMOUNTING_SIGKILL:
1111 /* as above */
1112 mount_set_state(m, MOUNT_UNMOUNTING_SIGKILL);
1113 return 0;
1114
1115 case MOUNT_MOUNTED:
1116 mount_enter_unmounting(m);
1117 return 1;
1118
1119 default:
1120 assert_not_reached("Unexpected state.");
1121 }
1122 }
1123
1124 static int mount_reload(Unit *u) {
1125 Mount *m = MOUNT(u);
1126
1127 assert(m);
1128 assert(m->state == MOUNT_MOUNTED);
1129
1130 mount_enter_remounting(m);
1131
1132 return 1;
1133 }
1134
1135 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
1136 Mount *m = MOUNT(u);
1137
1138 assert(m);
1139 assert(f);
1140 assert(fds);
1141
1142 (void) serialize_item(f, "state", mount_state_to_string(m->state));
1143 (void) serialize_item(f, "result", mount_result_to_string(m->result));
1144 (void) serialize_item(f, "reload-result", mount_result_to_string(m->reload_result));
1145
1146 if (m->control_pid > 0)
1147 (void) serialize_item_format(f, "control-pid", PID_FMT, m->control_pid);
1148
1149 if (m->control_command_id >= 0)
1150 (void) serialize_item(f, "control-command", mount_exec_command_to_string(m->control_command_id));
1151
1152 return 0;
1153 }
1154
1155 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1156 Mount *m = MOUNT(u);
1157
1158 assert(u);
1159 assert(key);
1160 assert(value);
1161 assert(fds);
1162
1163 if (streq(key, "state")) {
1164 MountState state;
1165
1166 if ((state = mount_state_from_string(value)) < 0)
1167 log_unit_debug(u, "Failed to parse state value: %s", value);
1168 else
1169 m->deserialized_state = state;
1170 } else if (streq(key, "result")) {
1171 MountResult f;
1172
1173 f = mount_result_from_string(value);
1174 if (f < 0)
1175 log_unit_debug(u, "Failed to parse result value: %s", value);
1176 else if (f != MOUNT_SUCCESS)
1177 m->result = f;
1178
1179 } else if (streq(key, "reload-result")) {
1180 MountResult f;
1181
1182 f = mount_result_from_string(value);
1183 if (f < 0)
1184 log_unit_debug(u, "Failed to parse reload result value: %s", value);
1185 else if (f != MOUNT_SUCCESS)
1186 m->reload_result = f;
1187
1188 } else if (streq(key, "control-pid")) {
1189 pid_t pid;
1190
1191 if (parse_pid(value, &pid) < 0)
1192 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
1193 else
1194 m->control_pid = pid;
1195 } else if (streq(key, "control-command")) {
1196 MountExecCommand id;
1197
1198 id = mount_exec_command_from_string(value);
1199 if (id < 0)
1200 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
1201 else {
1202 m->control_command_id = id;
1203 m->control_command = m->exec_command + id;
1204 }
1205 } else
1206 log_unit_debug(u, "Unknown serialization key: %s", key);
1207
1208 return 0;
1209 }
1210
1211 _pure_ static UnitActiveState mount_active_state(Unit *u) {
1212 assert(u);
1213
1214 return state_translation_table[MOUNT(u)->state];
1215 }
1216
1217 _pure_ static const char *mount_sub_state_to_string(Unit *u) {
1218 assert(u);
1219
1220 return mount_state_to_string(MOUNT(u)->state);
1221 }
1222
1223 _pure_ static bool mount_may_gc(Unit *u) {
1224 Mount *m = MOUNT(u);
1225
1226 assert(m);
1227
1228 if (m->from_proc_self_mountinfo)
1229 return false;
1230
1231 return true;
1232 }
1233
1234 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1235 Mount *m = MOUNT(u);
1236 MountResult f;
1237
1238 assert(m);
1239 assert(pid >= 0);
1240
1241 if (pid != m->control_pid)
1242 return;
1243
1244 m->control_pid = 0;
1245
1246 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
1247 f = MOUNT_SUCCESS;
1248 else if (code == CLD_EXITED)
1249 f = MOUNT_FAILURE_EXIT_CODE;
1250 else if (code == CLD_KILLED)
1251 f = MOUNT_FAILURE_SIGNAL;
1252 else if (code == CLD_DUMPED)
1253 f = MOUNT_FAILURE_CORE_DUMP;
1254 else
1255 assert_not_reached("Unknown code");
1256
1257 if (IN_SET(m->state, MOUNT_REMOUNTING, MOUNT_REMOUNTING_SIGKILL, MOUNT_REMOUNTING_SIGTERM))
1258 mount_set_reload_result(m, f);
1259 else if (m->result == MOUNT_SUCCESS)
1260 m->result = f;
1261
1262 if (m->control_command) {
1263 exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status);
1264
1265 m->control_command = NULL;
1266 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1267 }
1268
1269 unit_log_process_exit(
1270 u, f == MOUNT_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
1271 "Mount process",
1272 mount_exec_command_to_string(m->control_command_id),
1273 code, status);
1274
1275 /* Note that due to the io event priority logic, we can be sure the new mountinfo is loaded
1276 * before we process the SIGCHLD for the mount command. */
1277
1278 switch (m->state) {
1279
1280 case MOUNT_MOUNTING:
1281 /* Our mount point has not appeared in mountinfo. Something went wrong. */
1282
1283 if (f == MOUNT_SUCCESS) {
1284 /* Either /bin/mount has an unexpected definition of success,
1285 * or someone raced us and we lost. */
1286 log_unit_warning(UNIT(m), "Mount process finished, but there is no mount.");
1287 f = MOUNT_FAILURE_PROTOCOL;
1288 }
1289 mount_enter_dead(m, f);
1290 break;
1291
1292 case MOUNT_MOUNTING_DONE:
1293 mount_enter_mounted(m, f);
1294 break;
1295
1296 case MOUNT_REMOUNTING:
1297 case MOUNT_REMOUNTING_SIGTERM:
1298 case MOUNT_REMOUNTING_SIGKILL:
1299 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1300 break;
1301
1302 case MOUNT_UNMOUNTING:
1303
1304 if (f == MOUNT_SUCCESS && m->from_proc_self_mountinfo) {
1305
1306 /* Still a mount point? If so, let's try again. Most likely there were multiple mount points
1307 * stacked on top of each other. We might exceed the timeout specified by the user overall,
1308 * but we will stop as soon as any one umount times out. */
1309
1310 if (m->n_retry_umount < RETRY_UMOUNT_MAX) {
1311 log_unit_debug(u, "Mount still present, trying again.");
1312 m->n_retry_umount++;
1313 mount_enter_unmounting(m);
1314 } else {
1315 log_unit_warning(u, "Mount still present after %u attempts to unmount, giving up.", m->n_retry_umount);
1316 mount_enter_mounted(m, f);
1317 }
1318 } else
1319 mount_enter_dead_or_mounted(m, f);
1320
1321 break;
1322
1323 case MOUNT_UNMOUNTING_SIGKILL:
1324 case MOUNT_UNMOUNTING_SIGTERM:
1325 mount_enter_dead_or_mounted(m, f);
1326 break;
1327
1328 default:
1329 assert_not_reached("Uh, control process died at wrong time.");
1330 }
1331
1332 /* Notify clients about changed exit status */
1333 unit_add_to_dbus_queue(u);
1334 }
1335
1336 static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
1337 Mount *m = MOUNT(userdata);
1338
1339 assert(m);
1340 assert(m->timer_event_source == source);
1341
1342 switch (m->state) {
1343
1344 case MOUNT_MOUNTING:
1345 case MOUNT_MOUNTING_DONE:
1346 log_unit_warning(UNIT(m), "Mounting timed out. Terminating.");
1347 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1348 break;
1349
1350 case MOUNT_REMOUNTING:
1351 log_unit_warning(UNIT(m), "Remounting timed out. Terminating remount process.");
1352 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1353 mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, MOUNT_SUCCESS);
1354 break;
1355
1356 case MOUNT_REMOUNTING_SIGTERM:
1357 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1358
1359 if (m->kill_context.send_sigkill) {
1360 log_unit_warning(UNIT(m), "Remounting timed out. Killing.");
1361 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
1362 } else {
1363 log_unit_warning(UNIT(m), "Remounting timed out. Skipping SIGKILL. Ignoring.");
1364 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1365 }
1366 break;
1367
1368 case MOUNT_REMOUNTING_SIGKILL:
1369 mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1370
1371 log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
1372 mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1373 break;
1374
1375 case MOUNT_UNMOUNTING:
1376 log_unit_warning(UNIT(m), "Unmounting timed out. Terminating.");
1377 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1378 break;
1379
1380 case MOUNT_UNMOUNTING_SIGTERM:
1381 if (m->kill_context.send_sigkill) {
1382 log_unit_warning(UNIT(m), "Mount process timed out. Killing.");
1383 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
1384 } else {
1385 log_unit_warning(UNIT(m), "Mount process timed out. Skipping SIGKILL. Ignoring.");
1386 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
1387 }
1388 break;
1389
1390 case MOUNT_UNMOUNTING_SIGKILL:
1391 log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
1392 mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
1393 break;
1394
1395 default:
1396 assert_not_reached("Timeout at wrong time.");
1397 }
1398
1399 return 0;
1400 }
1401
1402 typedef struct {
1403 bool is_mounted;
1404 bool just_mounted;
1405 bool just_changed;
1406 } MountSetupFlags;
1407
1408 static int mount_setup_new_unit(
1409 Unit *u,
1410 const char *what,
1411 const char *where,
1412 const char *options,
1413 const char *fstype,
1414 MountSetupFlags *flags) {
1415
1416 MountParameters *p;
1417
1418 assert(u);
1419 assert(flags);
1420
1421 u->source_path = strdup("/proc/self/mountinfo");
1422 MOUNT(u)->where = strdup(where);
1423 if (!u->source_path || !MOUNT(u)->where)
1424 return -ENOMEM;
1425
1426 /* Make sure to initialize those fields before mount_is_extrinsic(). */
1427 MOUNT(u)->from_proc_self_mountinfo = true;
1428 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1429
1430 p->what = strdup(what);
1431 p->options = strdup(options);
1432 p->fstype = strdup(fstype);
1433 if (!p->what || !p->options || !p->fstype)
1434 return -ENOMEM;
1435
1436 if (!mount_is_extrinsic(MOUNT(u))) {
1437 const char *target;
1438 int r;
1439
1440 target = mount_is_network(p) ? SPECIAL_REMOTE_FS_TARGET : SPECIAL_LOCAL_FS_TARGET;
1441 r = unit_add_dependency_by_name(u, UNIT_BEFORE, target, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
1442 if (r < 0)
1443 return r;
1444
1445 r = unit_add_dependency_by_name(u, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
1446 if (r < 0)
1447 return r;
1448 }
1449
1450 unit_add_to_load_queue(u);
1451 flags->is_mounted = true;
1452 flags->just_mounted = true;
1453 flags->just_changed = true;
1454
1455 return 0;
1456 }
1457
1458 static int mount_setup_existing_unit(
1459 Unit *u,
1460 const char *what,
1461 const char *where,
1462 const char *options,
1463 const char *fstype,
1464 MountSetupFlags *flags) {
1465
1466 MountParameters *p;
1467 bool load_extras = false;
1468 int r1, r2, r3;
1469
1470 assert(u);
1471 assert(flags);
1472
1473 if (!MOUNT(u)->where) {
1474 MOUNT(u)->where = strdup(where);
1475 if (!MOUNT(u)->where)
1476 return -ENOMEM;
1477 }
1478
1479 /* Make sure to initialize those fields before mount_is_extrinsic(). */
1480 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1481
1482 r1 = free_and_strdup(&p->what, what);
1483 r2 = free_and_strdup(&p->options, options);
1484 r3 = free_and_strdup(&p->fstype, fstype);
1485 if (r1 < 0 || r2 < 0 || r3 < 0)
1486 return -ENOMEM;
1487
1488 flags->just_changed = r1 > 0 || r2 > 0 || r3 > 0;
1489 flags->is_mounted = true;
1490 flags->just_mounted = !MOUNT(u)->from_proc_self_mountinfo || MOUNT(u)->just_mounted;
1491
1492 MOUNT(u)->from_proc_self_mountinfo = true;
1493
1494 if (!mount_is_extrinsic(MOUNT(u)) && mount_is_network(p)) {
1495 /* _netdev option may have shown up late, or on a
1496 * remount. Add remote-fs dependencies, even though
1497 * local-fs ones may already be there.
1498 *
1499 * Note: due to a current limitation (we don't track
1500 * in the dependency "Set*" objects who created a
1501 * dependency), we can only add deps, never lose them,
1502 * until the next full daemon-reload. */
1503 unit_add_dependency_by_name(u, UNIT_BEFORE, SPECIAL_REMOTE_FS_TARGET, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
1504 load_extras = true;
1505 }
1506
1507 if (u->load_state == UNIT_NOT_FOUND) {
1508 u->load_state = UNIT_LOADED;
1509 u->load_error = 0;
1510
1511 /* Load in the extras later on, after we
1512 * finished initialization of the unit */
1513
1514 /* FIXME: since we're going to load the unit later on, why setting load_extras=true ? */
1515 load_extras = true;
1516 flags->just_changed = true;
1517 }
1518
1519 if (load_extras)
1520 return mount_add_extras(MOUNT(u));
1521
1522 return 0;
1523 }
1524
1525 static int mount_setup_unit(
1526 Manager *m,
1527 const char *what,
1528 const char *where,
1529 const char *options,
1530 const char *fstype,
1531 bool set_flags) {
1532
1533 _cleanup_free_ char *e = NULL;
1534 MountSetupFlags flags;
1535 Unit *u;
1536 int r;
1537
1538 assert(m);
1539 assert(what);
1540 assert(where);
1541 assert(options);
1542 assert(fstype);
1543
1544 /* Ignore API mount points. They should never be referenced in
1545 * dependencies ever. */
1546 if (mount_point_is_api(where) || mount_point_ignore(where))
1547 return 0;
1548
1549 if (streq(fstype, "autofs"))
1550 return 0;
1551
1552 /* probably some kind of swap, ignore */
1553 if (!is_path(where))
1554 return 0;
1555
1556 r = unit_name_from_path(where, ".mount", &e);
1557 if (r < 0)
1558 return r;
1559
1560 u = manager_get_unit(m, e);
1561 if (!u) {
1562 /* First time we see this mount point meaning that it's
1563 * not been initiated by a mount unit but rather by the
1564 * sysadmin having called mount(8) directly. */
1565 r = unit_new_for_name(m, sizeof(Mount), e, &u);
1566 if (r < 0)
1567 goto fail;
1568
1569 r = mount_setup_new_unit(u, what, where, options, fstype, &flags);
1570 if (r < 0)
1571 unit_free(u);
1572 } else
1573 r = mount_setup_existing_unit(u, what, where, options, fstype, &flags);
1574
1575 if (r < 0)
1576 goto fail;
1577
1578 if (set_flags) {
1579 MOUNT(u)->is_mounted = flags.is_mounted;
1580 MOUNT(u)->just_mounted = flags.just_mounted;
1581 MOUNT(u)->just_changed = flags.just_changed;
1582 }
1583
1584 if (flags.just_changed)
1585 unit_add_to_dbus_queue(u);
1586
1587 return 0;
1588 fail:
1589 return log_warning_errno(r, "Failed to set up mount unit: %m");
1590 }
1591
1592 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1593 _cleanup_(mnt_free_tablep) struct libmnt_table *t = NULL;
1594 _cleanup_(mnt_free_iterp) struct libmnt_iter *i = NULL;
1595 int r = 0;
1596
1597 assert(m);
1598
1599 t = mnt_new_table();
1600 i = mnt_new_iter(MNT_ITER_FORWARD);
1601 if (!t || !i)
1602 return log_oom();
1603
1604 r = mnt_table_parse_mtab(t, NULL);
1605 if (r < 0)
1606 return log_error_errno(r, "Failed to parse /proc/self/mountinfo: %m");
1607
1608 r = 0;
1609 for (;;) {
1610 struct libmnt_fs *fs;
1611 const char *device, *path, *options, *fstype;
1612 _cleanup_free_ char *d = NULL, *p = NULL;
1613 int k;
1614
1615 k = mnt_table_next_fs(t, i, &fs);
1616 if (k == 1)
1617 break;
1618 if (k < 0)
1619 return log_error_errno(k, "Failed to get next entry from /proc/self/mountinfo: %m");
1620
1621 device = mnt_fs_get_source(fs);
1622 path = mnt_fs_get_target(fs);
1623 options = mnt_fs_get_options(fs);
1624 fstype = mnt_fs_get_fstype(fs);
1625
1626 if (!device || !path)
1627 continue;
1628
1629 if (cunescape(device, UNESCAPE_RELAX, &d) < 0)
1630 return log_oom();
1631
1632 if (cunescape(path, UNESCAPE_RELAX, &p) < 0)
1633 return log_oom();
1634
1635 device_found_node(m, d, DEVICE_FOUND_MOUNT, DEVICE_FOUND_MOUNT);
1636
1637 k = mount_setup_unit(m, d, p, options, fstype, set_flags);
1638 if (r == 0 && k < 0)
1639 r = k;
1640 }
1641
1642 return r;
1643 }
1644
1645 static void mount_shutdown(Manager *m) {
1646 assert(m);
1647
1648 m->mount_event_source = sd_event_source_unref(m->mount_event_source);
1649
1650 mnt_unref_monitor(m->mount_monitor);
1651 m->mount_monitor = NULL;
1652 }
1653
1654 static int mount_get_timeout(Unit *u, usec_t *timeout) {
1655 Mount *m = MOUNT(u);
1656 usec_t t;
1657 int r;
1658
1659 if (!m->timer_event_source)
1660 return 0;
1661
1662 r = sd_event_source_get_time(m->timer_event_source, &t);
1663 if (r < 0)
1664 return r;
1665 if (t == USEC_INFINITY)
1666 return 0;
1667
1668 *timeout = t;
1669 return 1;
1670 }
1671
1672 static void mount_enumerate_perpetual(Manager *m) {
1673 Unit *u;
1674 int r;
1675
1676 assert(m);
1677
1678 /* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's
1679 * unconditionally synthesize it here and mark it as perpetual. */
1680
1681 u = manager_get_unit(m, SPECIAL_ROOT_MOUNT);
1682 if (!u) {
1683 r = unit_new_for_name(m, sizeof(Mount), SPECIAL_ROOT_MOUNT, &u);
1684 if (r < 0) {
1685 log_error_errno(r, "Failed to allocate the special " SPECIAL_ROOT_MOUNT " unit: %m");
1686 return;
1687 }
1688 }
1689
1690 u->perpetual = true;
1691 MOUNT(u)->deserialized_state = MOUNT_MOUNTED;
1692
1693 unit_add_to_load_queue(u);
1694 unit_add_to_dbus_queue(u);
1695 }
1696
1697 static bool mount_is_mounted(Mount *m) {
1698 assert(m);
1699
1700 return UNIT(m)->perpetual || m->is_mounted;
1701 }
1702
1703 static void mount_enumerate(Manager *m) {
1704 int r;
1705
1706 assert(m);
1707
1708 mnt_init_debug(0);
1709
1710 if (!m->mount_monitor) {
1711 int fd;
1712
1713 m->mount_monitor = mnt_new_monitor();
1714 if (!m->mount_monitor) {
1715 log_oom();
1716 goto fail;
1717 }
1718
1719 r = mnt_monitor_enable_kernel(m->mount_monitor, 1);
1720 if (r < 0) {
1721 log_error_errno(r, "Failed to enable watching of kernel mount events: %m");
1722 goto fail;
1723 }
1724
1725 r = mnt_monitor_enable_userspace(m->mount_monitor, 1, NULL);
1726 if (r < 0) {
1727 log_error_errno(r, "Failed to enable watching of userspace mount events: %m");
1728 goto fail;
1729 }
1730
1731 /* mnt_unref_monitor() will close the fd */
1732 fd = r = mnt_monitor_get_fd(m->mount_monitor);
1733 if (r < 0) {
1734 log_error_errno(r, "Failed to acquire watch file descriptor: %m");
1735 goto fail;
1736 }
1737
1738 r = sd_event_add_io(m->event, &m->mount_event_source, fd, EPOLLIN, mount_dispatch_io, m);
1739 if (r < 0) {
1740 log_error_errno(r, "Failed to watch mount file descriptor: %m");
1741 goto fail;
1742 }
1743
1744 r = sd_event_source_set_priority(m->mount_event_source, SD_EVENT_PRIORITY_NORMAL-10);
1745 if (r < 0) {
1746 log_error_errno(r, "Failed to adjust mount watch priority: %m");
1747 goto fail;
1748 }
1749
1750 (void) sd_event_source_set_description(m->mount_event_source, "mount-monitor-dispatch");
1751 }
1752
1753 r = mount_load_proc_self_mountinfo(m, false);
1754 if (r < 0)
1755 goto fail;
1756
1757 return;
1758
1759 fail:
1760 mount_shutdown(m);
1761 }
1762
1763 static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
1764 _cleanup_set_free_ Set *around = NULL, *gone = NULL;
1765 Manager *m = userdata;
1766 const char *what;
1767 Iterator i;
1768 Unit *u;
1769 int r;
1770
1771 assert(m);
1772 assert(revents & EPOLLIN);
1773
1774 if (fd == mnt_monitor_get_fd(m->mount_monitor)) {
1775 bool rescan = false;
1776
1777 /* Drain all events and verify that the event is valid.
1778 *
1779 * Note that libmount also monitors /run/mount mkdir if the
1780 * directory does not exist yet. The mkdir may generate event
1781 * which is irrelevant for us.
1782 *
1783 * error: r < 0; valid: r == 0, false positive: rc == 1 */
1784 do {
1785 r = mnt_monitor_next_change(m->mount_monitor, NULL, NULL);
1786 if (r == 0)
1787 rescan = true;
1788 else if (r < 0)
1789 return log_error_errno(r, "Failed to drain libmount events: %m");
1790 } while (r == 0);
1791
1792 log_debug("libmount event [rescan: %s]", yes_no(rescan));
1793 if (!rescan)
1794 return 0;
1795 }
1796
1797 r = mount_load_proc_self_mountinfo(m, true);
1798 if (r < 0) {
1799 /* Reset flags, just in case, for later calls */
1800 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1801 Mount *mount = MOUNT(u);
1802
1803 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1804 }
1805
1806 return 0;
1807 }
1808
1809 manager_dispatch_load_queue(m);
1810
1811 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1812 Mount *mount = MOUNT(u);
1813
1814 if (!mount_is_mounted(mount)) {
1815
1816 /* A mount point is not around right now. It
1817 * might be gone, or might never have
1818 * existed. */
1819
1820 if (mount->from_proc_self_mountinfo &&
1821 mount->parameters_proc_self_mountinfo.what) {
1822
1823 /* Remember that this device might just have disappeared */
1824 if (set_ensure_allocated(&gone, &path_hash_ops) < 0 ||
1825 set_put(gone, mount->parameters_proc_self_mountinfo.what) < 0)
1826 log_oom(); /* we don't care too much about OOM here... */
1827 }
1828
1829 mount->from_proc_self_mountinfo = false;
1830
1831 switch (mount->state) {
1832
1833 case MOUNT_MOUNTED:
1834 /* This has just been unmounted by
1835 * somebody else, follow the state
1836 * change. */
1837 mount->result = MOUNT_SUCCESS; /* make sure we forget any earlier umount failures */
1838 mount_enter_dead(mount, MOUNT_SUCCESS);
1839 break;
1840
1841 default:
1842 break;
1843 }
1844
1845 } else if (mount->just_mounted || mount->just_changed) {
1846
1847 /* A mount point was added or changed */
1848
1849 switch (mount->state) {
1850
1851 case MOUNT_DEAD:
1852 case MOUNT_FAILED:
1853
1854 /* This has just been mounted by somebody else, follow the state change, but let's
1855 * generate a new invocation ID for this implicitly and automatically. */
1856 (void) unit_acquire_invocation_id(UNIT(mount));
1857 mount_enter_mounted(mount, MOUNT_SUCCESS);
1858 break;
1859
1860 case MOUNT_MOUNTING:
1861 mount_set_state(mount, MOUNT_MOUNTING_DONE);
1862 break;
1863
1864 default:
1865 /* Nothing really changed, but let's
1866 * issue an notification call
1867 * nonetheless, in case somebody is
1868 * waiting for this. (e.g. file system
1869 * ro/rw remounts.) */
1870 mount_set_state(mount, mount->state);
1871 break;
1872 }
1873 }
1874
1875 if (mount_is_mounted(mount) &&
1876 mount->from_proc_self_mountinfo &&
1877 mount->parameters_proc_self_mountinfo.what) {
1878
1879 if (set_ensure_allocated(&around, &path_hash_ops) < 0 ||
1880 set_put(around, mount->parameters_proc_self_mountinfo.what) < 0)
1881 log_oom();
1882 }
1883
1884 /* Reset the flags for later calls */
1885 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1886 }
1887
1888 SET_FOREACH(what, gone, i) {
1889 if (set_contains(around, what))
1890 continue;
1891
1892 /* Let the device units know that the device is no longer mounted */
1893 device_found_node(m, what, 0, DEVICE_FOUND_MOUNT);
1894 }
1895
1896 return 0;
1897 }
1898
1899 static void mount_reset_failed(Unit *u) {
1900 Mount *m = MOUNT(u);
1901
1902 assert(m);
1903
1904 if (m->state == MOUNT_FAILED)
1905 mount_set_state(m, MOUNT_DEAD);
1906
1907 m->result = MOUNT_SUCCESS;
1908 m->reload_result = MOUNT_SUCCESS;
1909 }
1910
1911 static int mount_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
1912 Mount *m = MOUNT(u);
1913
1914 assert(m);
1915
1916 return unit_kill_common(u, who, signo, -1, MOUNT(u)->control_pid, error);
1917 }
1918
1919 static int mount_control_pid(Unit *u) {
1920 Mount *m = MOUNT(u);
1921
1922 assert(m);
1923
1924 return m->control_pid;
1925 }
1926
1927 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1928 [MOUNT_EXEC_MOUNT] = "ExecMount",
1929 [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1930 [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1931 };
1932
1933 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1934
1935 static const char* const mount_result_table[_MOUNT_RESULT_MAX] = {
1936 [MOUNT_SUCCESS] = "success",
1937 [MOUNT_FAILURE_RESOURCES] = "resources",
1938 [MOUNT_FAILURE_TIMEOUT] = "timeout",
1939 [MOUNT_FAILURE_EXIT_CODE] = "exit-code",
1940 [MOUNT_FAILURE_SIGNAL] = "signal",
1941 [MOUNT_FAILURE_CORE_DUMP] = "core-dump",
1942 [MOUNT_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
1943 [MOUNT_FAILURE_PROTOCOL] = "protocol",
1944 };
1945
1946 DEFINE_STRING_TABLE_LOOKUP(mount_result, MountResult);
1947
1948 const UnitVTable mount_vtable = {
1949 .object_size = sizeof(Mount),
1950 .exec_context_offset = offsetof(Mount, exec_context),
1951 .cgroup_context_offset = offsetof(Mount, cgroup_context),
1952 .kill_context_offset = offsetof(Mount, kill_context),
1953 .exec_runtime_offset = offsetof(Mount, exec_runtime),
1954 .dynamic_creds_offset = offsetof(Mount, dynamic_creds),
1955
1956 .sections =
1957 "Unit\0"
1958 "Mount\0"
1959 "Install\0",
1960 .private_section = "Mount",
1961
1962 .init = mount_init,
1963 .load = mount_load,
1964 .done = mount_done,
1965
1966 .coldplug = mount_coldplug,
1967
1968 .dump = mount_dump,
1969
1970 .start = mount_start,
1971 .stop = mount_stop,
1972 .reload = mount_reload,
1973
1974 .kill = mount_kill,
1975
1976 .serialize = mount_serialize,
1977 .deserialize_item = mount_deserialize_item,
1978
1979 .active_state = mount_active_state,
1980 .sub_state_to_string = mount_sub_state_to_string,
1981
1982 .may_gc = mount_may_gc,
1983
1984 .sigchld_event = mount_sigchld_event,
1985
1986 .reset_failed = mount_reset_failed,
1987
1988 .control_pid = mount_control_pid,
1989
1990 .bus_vtable = bus_mount_vtable,
1991 .bus_set_property = bus_mount_set_property,
1992 .bus_commit_properties = bus_mount_commit_properties,
1993
1994 .get_timeout = mount_get_timeout,
1995
1996 .can_transient = true,
1997
1998 .enumerate_perpetual = mount_enumerate_perpetual,
1999 .enumerate = mount_enumerate,
2000 .shutdown = mount_shutdown,
2001
2002 .status_message_formats = {
2003 .starting_stopping = {
2004 [0] = "Mounting %s...",
2005 [1] = "Unmounting %s...",
2006 },
2007 .finished_start_job = {
2008 [JOB_DONE] = "Mounted %s.",
2009 [JOB_FAILED] = "Failed to mount %s.",
2010 [JOB_TIMEOUT] = "Timed out mounting %s.",
2011 },
2012 .finished_stop_job = {
2013 [JOB_DONE] = "Unmounted %s.",
2014 [JOB_FAILED] = "Failed unmounting %s.",
2015 [JOB_TIMEOUT] = "Timed out unmounting %s.",
2016 },
2017 },
2018 };
Unnamed repository; edit this file 'description' to name the repository.