Line data Source code
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 "sd-messages.h"
9 :
10 : #include "alloc-util.h"
11 : #include "dbus-mount.h"
12 : #include "dbus-unit.h"
13 : #include "device.h"
14 : #include "exit-status.h"
15 : #include "format-util.h"
16 : #include "fstab-util.h"
17 : #include "libmount-util.h"
18 : #include "log.h"
19 : #include "manager.h"
20 : #include "mkdir.h"
21 : #include "mount-setup.h"
22 : #include "mount.h"
23 : #include "mountpoint-util.h"
24 : #include "parse-util.h"
25 : #include "path-util.h"
26 : #include "process-util.h"
27 : #include "serialize.h"
28 : #include "special.h"
29 : #include "string-table.h"
30 : #include "string-util.h"
31 : #include "strv.h"
32 : #include "unit-name.h"
33 : #include "unit.h"
34 :
35 : #define RETRY_UMOUNT_MAX 32
36 :
37 : static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
38 : [MOUNT_DEAD] = UNIT_INACTIVE,
39 : [MOUNT_MOUNTING] = UNIT_ACTIVATING,
40 : [MOUNT_MOUNTING_DONE] = UNIT_ACTIVATING,
41 : [MOUNT_MOUNTED] = UNIT_ACTIVE,
42 : [MOUNT_REMOUNTING] = UNIT_RELOADING,
43 : [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
44 : [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING,
45 : [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING,
46 : [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
47 : [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
48 : [MOUNT_FAILED] = UNIT_FAILED
49 : };
50 :
51 : static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
52 : static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
53 : static int mount_process_proc_self_mountinfo(Manager *m);
54 :
55 165 : static bool MOUNT_STATE_WITH_PROCESS(MountState state) {
56 165 : return IN_SET(state,
57 : MOUNT_MOUNTING,
58 : MOUNT_MOUNTING_DONE,
59 : MOUNT_REMOUNTING,
60 : MOUNT_REMOUNTING_SIGTERM,
61 : MOUNT_REMOUNTING_SIGKILL,
62 : MOUNT_UNMOUNTING,
63 : MOUNT_UNMOUNTING_SIGTERM,
64 : MOUNT_UNMOUNTING_SIGKILL);
65 : }
66 :
67 0 : static bool mount_is_network(const MountParameters *p) {
68 0 : assert(p);
69 :
70 0 : if (fstab_test_option(p->options, "_netdev\0"))
71 0 : return true;
72 :
73 0 : if (p->fstype && fstype_is_network(p->fstype))
74 0 : return true;
75 :
76 0 : return false;
77 : }
78 :
79 0 : static bool mount_is_loop(const MountParameters *p) {
80 0 : assert(p);
81 :
82 0 : if (fstab_test_option(p->options, "loop\0"))
83 0 : return true;
84 :
85 0 : return false;
86 : }
87 :
88 176 : static bool mount_is_bind(const MountParameters *p) {
89 176 : assert(p);
90 :
91 176 : if (fstab_test_option(p->options, "bind\0" "rbind\0"))
92 0 : return true;
93 :
94 176 : if (p->fstype && STR_IN_SET(p->fstype, "bind", "rbind"))
95 0 : return true;
96 :
97 176 : return false;
98 : }
99 :
100 33 : static bool mount_is_bound_to_device(const Mount *m) {
101 : const MountParameters *p;
102 :
103 33 : if (m->from_fragment)
104 0 : return true;
105 :
106 33 : p = &m->parameters_proc_self_mountinfo;
107 33 : return fstab_test_option(p->options, "x-systemd.device-bound\0");
108 : }
109 :
110 0 : static bool mount_needs_quota(const MountParameters *p) {
111 0 : assert(p);
112 :
113 : /* Quotas are not enabled on network filesystems, but we want them, for example, on storage connected via
114 : * iscsi. We hence don't use mount_is_network() here, as that would also return true for _netdev devices. */
115 0 : if (p->fstype && fstype_is_network(p->fstype))
116 0 : return false;
117 :
118 0 : if (mount_is_bind(p))
119 0 : return false;
120 :
121 0 : return fstab_test_option(p->options,
122 : "usrquota\0" "grpquota\0" "quota\0" "usrjquota\0" "grpjquota\0");
123 : }
124 :
125 447 : static void mount_init(Unit *u) {
126 447 : Mount *m = MOUNT(u);
127 :
128 447 : assert(u);
129 447 : assert(u->load_state == UNIT_STUB);
130 :
131 447 : m->timeout_usec = u->manager->default_timeout_start_usec;
132 :
133 447 : m->exec_context.std_output = u->manager->default_std_output;
134 447 : m->exec_context.std_error = u->manager->default_std_error;
135 :
136 447 : m->directory_mode = 0755;
137 :
138 : /* We need to make sure that /usr/bin/mount is always called
139 : * in the same process group as us, so that the autofs kernel
140 : * side doesn't send us another mount request while we are
141 : * already trying to comply its last one. */
142 447 : m->exec_context.same_pgrp = true;
143 :
144 447 : m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
145 :
146 447 : u->ignore_on_isolate = true;
147 447 : }
148 :
149 0 : static int mount_arm_timer(Mount *m, usec_t usec) {
150 : int r;
151 :
152 0 : assert(m);
153 :
154 0 : if (m->timer_event_source) {
155 0 : r = sd_event_source_set_time(m->timer_event_source, usec);
156 0 : if (r < 0)
157 0 : return r;
158 :
159 0 : return sd_event_source_set_enabled(m->timer_event_source, SD_EVENT_ONESHOT);
160 : }
161 :
162 0 : if (usec == USEC_INFINITY)
163 0 : return 0;
164 :
165 0 : r = sd_event_add_time(
166 0 : UNIT(m)->manager->event,
167 : &m->timer_event_source,
168 : CLOCK_MONOTONIC,
169 : usec, 0,
170 : mount_dispatch_timer, m);
171 0 : if (r < 0)
172 0 : return r;
173 :
174 0 : (void) sd_event_source_set_description(m->timer_event_source, "mount-timer");
175 :
176 0 : return 0;
177 : }
178 :
179 612 : static void mount_unwatch_control_pid(Mount *m) {
180 612 : assert(m);
181 :
182 612 : if (m->control_pid <= 0)
183 612 : return;
184 :
185 0 : unit_unwatch_pid(UNIT(m), m->control_pid);
186 0 : m->control_pid = 0;
187 : }
188 :
189 894 : static void mount_parameters_done(MountParameters *p) {
190 894 : assert(p);
191 :
192 894 : p->what = mfree(p->what);
193 894 : p->options = mfree(p->options);
194 894 : p->fstype = mfree(p->fstype);
195 894 : }
196 :
197 447 : static void mount_done(Unit *u) {
198 447 : Mount *m = MOUNT(u);
199 :
200 447 : assert(m);
201 :
202 447 : m->where = mfree(m->where);
203 :
204 447 : mount_parameters_done(&m->parameters_proc_self_mountinfo);
205 447 : mount_parameters_done(&m->parameters_fragment);
206 :
207 447 : m->exec_runtime = exec_runtime_unref(m->exec_runtime, false);
208 447 : exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
209 447 : m->control_command = NULL;
210 :
211 447 : dynamic_creds_unref(&m->dynamic_creds);
212 :
213 447 : mount_unwatch_control_pid(m);
214 :
215 447 : m->timer_event_source = sd_event_source_unref(m->timer_event_source);
216 447 : }
217 :
218 341 : _pure_ static MountParameters* get_mount_parameters_fragment(Mount *m) {
219 341 : assert(m);
220 :
221 341 : if (m->from_fragment)
222 0 : return &m->parameters_fragment;
223 :
224 341 : return NULL;
225 : }
226 :
227 266 : _pure_ static MountParameters* get_mount_parameters(Mount *m) {
228 266 : assert(m);
229 :
230 266 : if (m->from_proc_self_mountinfo)
231 266 : return &m->parameters_proc_self_mountinfo;
232 :
233 0 : return get_mount_parameters_fragment(m);
234 : }
235 :
236 165 : static int update_parameters_proc_self_mountinfo(
237 : Mount *m,
238 : const char *what,
239 : const char *options,
240 : const char *fstype) {
241 :
242 : MountParameters *p;
243 : int r, q, w;
244 :
245 165 : p = &m->parameters_proc_self_mountinfo;
246 :
247 165 : r = free_and_strdup(&p->what, what);
248 165 : if (r < 0)
249 0 : return r;
250 :
251 165 : q = free_and_strdup(&p->options, options);
252 165 : if (q < 0)
253 0 : return q;
254 :
255 165 : w = free_and_strdup(&p->fstype, fstype);
256 165 : if (w < 0)
257 0 : return w;
258 :
259 165 : return r > 0 || q > 0 || w > 0;
260 : }
261 :
262 176 : static int mount_add_mount_dependencies(Mount *m) {
263 : MountParameters *pm;
264 : Unit *other;
265 : Iterator i;
266 : Set *s;
267 : int r;
268 :
269 176 : assert(m);
270 :
271 176 : if (!path_equal(m->where, "/")) {
272 154 : _cleanup_free_ char *parent = NULL;
273 :
274 : /* Adds in links to other mount points that might lie further up in the hierarchy */
275 :
276 154 : parent = dirname_malloc(m->where);
277 154 : if (!parent)
278 0 : return -ENOMEM;
279 :
280 154 : r = unit_require_mounts_for(UNIT(m), parent, UNIT_DEPENDENCY_IMPLICIT);
281 154 : if (r < 0)
282 0 : return r;
283 : }
284 :
285 : /* Adds in dependencies to other mount points that might be needed for the source path (if this is a bind mount
286 : * or a loop mount) to be available. */
287 176 : pm = get_mount_parameters_fragment(m);
288 176 : if (pm && pm->what &&
289 0 : path_is_absolute(pm->what) &&
290 0 : (mount_is_bind(pm) || mount_is_loop(pm) || !mount_is_network(pm))) {
291 :
292 0 : r = unit_require_mounts_for(UNIT(m), pm->what, UNIT_DEPENDENCY_FILE);
293 0 : if (r < 0)
294 0 : return r;
295 : }
296 :
297 : /* Adds in dependencies to other units that use this path or paths further down in the hierarchy */
298 176 : s = manager_get_units_requiring_mounts_for(UNIT(m)->manager, m->where);
299 429 : SET_FOREACH(other, s, i) {
300 :
301 253 : if (other->load_state != UNIT_LOADED)
302 0 : continue;
303 :
304 253 : if (other == UNIT(m))
305 0 : continue;
306 :
307 253 : r = unit_add_dependency(other, UNIT_AFTER, UNIT(m), true, UNIT_DEPENDENCY_PATH);
308 253 : if (r < 0)
309 0 : return r;
310 :
311 253 : if (UNIT(m)->fragment_path) {
312 : /* If we have fragment configuration, then make this dependency required */
313 0 : r = unit_add_dependency(other, UNIT_REQUIRES, UNIT(m), true, UNIT_DEPENDENCY_PATH);
314 0 : if (r < 0)
315 0 : return r;
316 : }
317 : }
318 :
319 176 : return 0;
320 : }
321 :
322 176 : static int mount_add_device_dependencies(Mount *m) {
323 : UnitDependencyMask mask;
324 : MountParameters *p;
325 : UnitDependency dep;
326 : int r;
327 :
328 176 : assert(m);
329 :
330 176 : p = get_mount_parameters(m);
331 176 : if (!p)
332 0 : return 0;
333 :
334 176 : if (!p->what)
335 0 : return 0;
336 :
337 176 : if (mount_is_bind(p))
338 0 : return 0;
339 :
340 176 : if (!is_device_path(p->what))
341 121 : return 0;
342 :
343 : /* /dev/root is a really weird thing, it's not a real device,
344 : * but just a path the kernel exports for the root file system
345 : * specified on the kernel command line. Ignore it here. */
346 55 : if (path_equal(p->what, "/dev/root"))
347 0 : return 0;
348 :
349 55 : if (path_equal(m->where, "/"))
350 22 : return 0;
351 :
352 : /* Mount units from /proc/self/mountinfo are not bound to devices
353 : * by default since they're subject to races when devices are
354 : * unplugged. But the user can still force this dep with an
355 : * appropriate option (or udev property) so the mount units are
356 : * automatically stopped when the device disappears suddenly. */
357 33 : dep = mount_is_bound_to_device(m) ? UNIT_BINDS_TO : UNIT_REQUIRES;
358 :
359 : /* We always use 'what' from /proc/self/mountinfo if mounted */
360 33 : mask = m->from_proc_self_mountinfo ? UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT : UNIT_DEPENDENCY_FILE;
361 :
362 33 : r = unit_add_node_dependency(UNIT(m), p->what, false, dep, mask);
363 33 : if (r < 0)
364 0 : return r;
365 :
366 33 : return 0;
367 : }
368 :
369 176 : static int mount_add_quota_dependencies(Mount *m) {
370 : UnitDependencyMask mask;
371 : MountParameters *p;
372 : int r;
373 :
374 176 : assert(m);
375 :
376 176 : if (!MANAGER_IS_SYSTEM(UNIT(m)->manager))
377 176 : return 0;
378 :
379 0 : p = get_mount_parameters_fragment(m);
380 0 : if (!p)
381 0 : return 0;
382 :
383 0 : if (!mount_needs_quota(p))
384 0 : return 0;
385 :
386 0 : mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT;
387 :
388 0 : r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, true, mask);
389 0 : if (r < 0)
390 0 : return r;
391 :
392 0 : r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, true, mask);
393 0 : if (r < 0)
394 0 : return r;
395 :
396 0 : return 0;
397 : }
398 :
399 255 : static bool mount_is_extrinsic(Mount *m) {
400 : MountParameters *p;
401 255 : assert(m);
402 :
403 : /* Returns true for all units that are "magic" and should be excluded from the usual start-up and shutdown
404 : * dependencies. We call them "extrinsic" here, as they are generally mounted outside of the systemd dependency
405 : * logic. We shouldn't attempt to manage them ourselves but it's fine if the user operates on them with us. */
406 :
407 255 : if (!MANAGER_IS_SYSTEM(UNIT(m)->manager)) /* We only automatically manage mounts if we are in system mode */
408 255 : return true;
409 :
410 0 : if (PATH_IN_SET(m->where, /* Don't bother with the OS data itself */
411 : "/",
412 : "/usr"))
413 0 : return true;
414 :
415 0 : if (PATH_STARTSWITH_SET(m->where,
416 : "/run/initramfs", /* This should stay around from before we boot until after we shutdown */
417 : "/proc", /* All of this is API VFS */
418 : "/sys", /* … dito … */
419 : "/dev")) /* … dito … */
420 0 : return true;
421 :
422 : /* If this is an initrd mount, and we are not in the initrd, then leave this around forever, too. */
423 0 : p = get_mount_parameters(m);
424 0 : if (p && fstab_test_option(p->options, "x-initrd.mount\0") && !in_initrd())
425 0 : return true;
426 :
427 0 : return false;
428 : }
429 :
430 176 : static int mount_add_default_dependencies(Mount *m) {
431 : const char *after, *before;
432 : UnitDependencyMask mask;
433 : MountParameters *p;
434 : bool nofail;
435 : int r;
436 :
437 176 : assert(m);
438 :
439 176 : if (!UNIT(m)->default_dependencies)
440 11 : return 0;
441 :
442 : /* We do not add any default dependencies to /, /usr or /run/initramfs/, since they are guaranteed to stay
443 : * mounted the whole time, since our system is on it. Also, don't bother with anything mounted below virtual
444 : * file systems, it's also going to be virtual, and hence not worth the effort. */
445 165 : if (mount_is_extrinsic(m))
446 165 : return 0;
447 :
448 0 : p = get_mount_parameters(m);
449 0 : if (!p)
450 0 : return 0;
451 :
452 0 : mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_DEFAULT;
453 0 : nofail = m->from_fragment ? fstab_test_yes_no_option(m->parameters_fragment.options, "nofail\0" "fail\0") : false;
454 :
455 0 : if (mount_is_network(p)) {
456 : /* We order ourselves after network.target. This is
457 : * primarily useful at shutdown: services that take
458 : * down the network should order themselves before
459 : * network.target, so that they are shut down only
460 : * after this mount unit is stopped. */
461 :
462 0 : r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_NETWORK_TARGET, true, mask);
463 0 : if (r < 0)
464 0 : return r;
465 :
466 : /* We pull in network-online.target, and order
467 : * ourselves after it. This is useful at start-up to
468 : * actively pull in tools that want to be started
469 : * before we start mounting network file systems, and
470 : * whose purpose it is to delay this until the network
471 : * is "up". */
472 :
473 0 : r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_WANTS, UNIT_AFTER, SPECIAL_NETWORK_ONLINE_TARGET, true, mask);
474 0 : if (r < 0)
475 0 : return r;
476 :
477 0 : after = SPECIAL_REMOTE_FS_PRE_TARGET;
478 0 : before = SPECIAL_REMOTE_FS_TARGET;
479 : } else {
480 0 : after = SPECIAL_LOCAL_FS_PRE_TARGET;
481 0 : before = SPECIAL_LOCAL_FS_TARGET;
482 : }
483 :
484 0 : if (!nofail) {
485 0 : r = unit_add_dependency_by_name(UNIT(m), UNIT_BEFORE, before, true, mask);
486 0 : if (r < 0)
487 0 : return r;
488 : }
489 :
490 0 : r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, true, mask);
491 0 : if (r < 0)
492 0 : return r;
493 :
494 0 : r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, true, mask);
495 0 : if (r < 0)
496 0 : return r;
497 :
498 : /* If this is a tmpfs mount then we have to unmount it before we try to deactivate swaps */
499 0 : if (streq_ptr(p->fstype, "tmpfs")) {
500 0 : r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_SWAP_TARGET, true, mask);
501 0 : if (r < 0)
502 0 : return r;
503 : }
504 :
505 0 : return 0;
506 : }
507 :
508 165 : static int mount_verify(Mount *m) {
509 165 : _cleanup_free_ char *e = NULL;
510 : MountParameters *p;
511 : int r;
512 :
513 165 : assert(m);
514 :
515 165 : if (UNIT(m)->load_state != UNIT_LOADED)
516 0 : return 0;
517 :
518 165 : if (!m->from_fragment && !m->from_proc_self_mountinfo && !UNIT(m)->perpetual)
519 0 : return -ENOENT;
520 :
521 165 : r = unit_name_from_path(m->where, ".mount", &e);
522 165 : if (r < 0)
523 0 : return log_unit_error_errno(UNIT(m), r, "Failed to generate unit name from mount path: %m");
524 :
525 165 : if (!unit_has_name(UNIT(m), e)) {
526 0 : log_unit_error(UNIT(m), "Where= setting doesn't match unit name. Refusing.");
527 0 : return -ENOEXEC;
528 : }
529 :
530 165 : if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
531 0 : log_unit_error(UNIT(m), "Cannot create mount unit for API file system %s. Refusing.", m->where);
532 0 : return -ENOEXEC;
533 : }
534 :
535 165 : p = get_mount_parameters_fragment(m);
536 165 : if (p && !p->what) {
537 0 : log_unit_error(UNIT(m), "What= setting is missing. Refusing.");
538 0 : return -ENOEXEC;
539 : }
540 :
541 165 : if (m->exec_context.pam_name && m->kill_context.kill_mode != KILL_CONTROL_GROUP) {
542 0 : log_unit_error(UNIT(m), "Unit has PAM enabled. Kill mode must be set to control-group'. Refusing.");
543 0 : return -ENOEXEC;
544 : }
545 :
546 165 : return 0;
547 : }
548 :
549 176 : static int mount_add_extras(Mount *m) {
550 176 : Unit *u = UNIT(m);
551 : int r;
552 :
553 176 : assert(m);
554 :
555 : /* Note: this call might be called after we already have been loaded once (and even when it has already been
556 : * activated), in case data from /proc/self/mountinfo has changed. This means all code here needs to be ready
557 : * to run with an already set up unit. */
558 :
559 176 : if (u->fragment_path)
560 0 : m->from_fragment = true;
561 :
562 176 : if (!m->where) {
563 0 : r = unit_name_to_path(u->id, &m->where);
564 0 : if (r < 0)
565 0 : return r;
566 : }
567 :
568 176 : path_simplify(m->where, false);
569 :
570 176 : if (!u->description) {
571 165 : r = unit_set_description(u, m->where);
572 165 : if (r < 0)
573 0 : return r;
574 : }
575 :
576 176 : r = mount_add_device_dependencies(m);
577 176 : if (r < 0)
578 0 : return r;
579 :
580 176 : r = mount_add_mount_dependencies(m);
581 176 : if (r < 0)
582 0 : return r;
583 :
584 176 : r = mount_add_quota_dependencies(m);
585 176 : if (r < 0)
586 0 : return r;
587 :
588 176 : r = unit_patch_contexts(u);
589 176 : if (r < 0)
590 0 : return r;
591 :
592 176 : r = unit_add_exec_dependencies(u, &m->exec_context);
593 176 : if (r < 0)
594 0 : return r;
595 :
596 176 : r = unit_set_default_slice(u);
597 176 : if (r < 0)
598 0 : return r;
599 :
600 176 : r = mount_add_default_dependencies(m);
601 176 : if (r < 0)
602 0 : return r;
603 :
604 176 : return 0;
605 : }
606 :
607 447 : static int mount_load_root_mount(Unit *u) {
608 447 : assert(u);
609 :
610 447 : if (!unit_has_name(u, SPECIAL_ROOT_MOUNT))
611 436 : return 0;
612 :
613 11 : u->perpetual = true;
614 11 : u->default_dependencies = false;
615 :
616 : /* The stdio/kmsg bridge socket is on /, in order to avoid a dep loop, don't use kmsg logging for -.mount */
617 11 : MOUNT(u)->exec_context.std_output = EXEC_OUTPUT_NULL;
618 11 : MOUNT(u)->exec_context.std_input = EXEC_INPUT_NULL;
619 :
620 11 : if (!u->description)
621 0 : u->description = strdup("Root Mount");
622 :
623 11 : return 1;
624 : }
625 :
626 447 : static int mount_load(Unit *u) {
627 447 : Mount *m = MOUNT(u);
628 : int r, q, w;
629 :
630 447 : assert(u);
631 447 : assert(u->load_state == UNIT_STUB);
632 :
633 447 : r = mount_load_root_mount(u);
634 :
635 447 : if (m->from_proc_self_mountinfo || u->perpetual)
636 165 : q = unit_load_fragment_and_dropin_optional(u);
637 : else
638 282 : q = unit_load_fragment_and_dropin(u);
639 :
640 : /* Add in some extras. Note we do this in all cases (even if we failed to load the unit) when announced by the
641 : * kernel, because we need some things to be set up no matter what when the kernel establishes a mount and thus
642 : * we need to update the state in our unit to track it. After all, consider that we don't allow changing the
643 : * 'slice' field for a unit once it is active. */
644 447 : if (u->load_state == UNIT_LOADED || m->from_proc_self_mountinfo || u->perpetual)
645 165 : w = mount_add_extras(m);
646 : else
647 282 : w = 0;
648 :
649 447 : if (r < 0)
650 0 : return r;
651 447 : if (q < 0)
652 282 : return q;
653 165 : if (w < 0)
654 0 : return w;
655 :
656 165 : return mount_verify(m);
657 : }
658 :
659 165 : static void mount_set_state(Mount *m, MountState state) {
660 : MountState old_state;
661 165 : assert(m);
662 :
663 165 : if (m->state != state)
664 165 : bus_unit_send_pending_change_signal(UNIT(m), false);
665 :
666 165 : old_state = m->state;
667 165 : m->state = state;
668 :
669 165 : if (!MOUNT_STATE_WITH_PROCESS(state)) {
670 165 : m->timer_event_source = sd_event_source_unref(m->timer_event_source);
671 165 : mount_unwatch_control_pid(m);
672 165 : m->control_command = NULL;
673 165 : m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
674 : }
675 :
676 165 : if (state != old_state)
677 165 : log_unit_debug(UNIT(m), "Changed %s -> %s", mount_state_to_string(old_state), mount_state_to_string(state));
678 :
679 165 : unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state],
680 165 : m->reload_result == MOUNT_SUCCESS ? 0 : UNIT_NOTIFY_RELOAD_FAILURE);
681 165 : }
682 :
683 429 : static int mount_coldplug(Unit *u) {
684 429 : Mount *m = MOUNT(u);
685 429 : MountState new_state = MOUNT_DEAD;
686 : int r;
687 :
688 429 : assert(m);
689 429 : assert(m->state == MOUNT_DEAD);
690 :
691 429 : if (m->deserialized_state != m->state)
692 11 : new_state = m->deserialized_state;
693 418 : else if (m->from_proc_self_mountinfo)
694 154 : new_state = MOUNT_MOUNTED;
695 :
696 429 : if (new_state == m->state)
697 264 : return 0;
698 :
699 165 : if (m->control_pid > 0 &&
700 0 : pid_is_unwaited(m->control_pid) &&
701 0 : MOUNT_STATE_WITH_PROCESS(new_state)) {
702 :
703 0 : r = unit_watch_pid(UNIT(m), m->control_pid, false);
704 0 : if (r < 0)
705 0 : return r;
706 :
707 0 : r = mount_arm_timer(m, usec_add(u->state_change_timestamp.monotonic, m->timeout_usec));
708 0 : if (r < 0)
709 0 : return r;
710 : }
711 :
712 165 : if (!IN_SET(new_state, MOUNT_DEAD, MOUNT_FAILED)) {
713 165 : (void) unit_setup_dynamic_creds(u);
714 165 : (void) unit_setup_exec_runtime(u);
715 : }
716 :
717 165 : mount_set_state(m, new_state);
718 165 : return 0;
719 : }
720 :
721 90 : static void mount_dump(Unit *u, FILE *f, const char *prefix) {
722 : char buf[FORMAT_TIMESPAN_MAX];
723 90 : Mount *m = MOUNT(u);
724 : MountParameters *p;
725 :
726 90 : assert(m);
727 90 : assert(f);
728 :
729 90 : p = get_mount_parameters(m);
730 :
731 540 : fprintf(f,
732 : "%sMount State: %s\n"
733 : "%sResult: %s\n"
734 : "%sWhere: %s\n"
735 : "%sWhat: %s\n"
736 : "%sFile System Type: %s\n"
737 : "%sOptions: %s\n"
738 : "%sFrom /proc/self/mountinfo: %s\n"
739 : "%sFrom fragment: %s\n"
740 : "%sExtrinsic: %s\n"
741 : "%sDirectoryMode: %04o\n"
742 : "%sSloppyOptions: %s\n"
743 : "%sLazyUnmount: %s\n"
744 : "%sForceUnmount: %s\n"
745 : "%sTimeoutSec: %s\n",
746 : prefix, mount_state_to_string(m->state),
747 : prefix, mount_result_to_string(m->result),
748 : prefix, m->where,
749 90 : prefix, p ? strna(p->what) : "n/a",
750 90 : prefix, p ? strna(p->fstype) : "n/a",
751 90 : prefix, p ? strna(p->options) : "n/a",
752 90 : prefix, yes_no(m->from_proc_self_mountinfo),
753 90 : prefix, yes_no(m->from_fragment),
754 90 : prefix, yes_no(mount_is_extrinsic(m)),
755 : prefix, m->directory_mode,
756 90 : prefix, yes_no(m->sloppy_options),
757 90 : prefix, yes_no(m->lazy_unmount),
758 90 : prefix, yes_no(m->force_unmount),
759 : prefix, format_timespan(buf, sizeof(buf), m->timeout_usec, USEC_PER_SEC));
760 :
761 90 : if (m->control_pid > 0)
762 0 : fprintf(f,
763 : "%sControl PID: "PID_FMT"\n",
764 : prefix, m->control_pid);
765 :
766 90 : exec_context_dump(&m->exec_context, f, prefix);
767 90 : kill_context_dump(&m->kill_context, f, prefix);
768 90 : cgroup_context_dump(&m->cgroup_context, f, prefix);
769 90 : }
770 :
771 0 : static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
772 :
773 0 : _cleanup_(exec_params_clear) ExecParameters exec_params = {
774 : .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
775 : .stdin_fd = -1,
776 : .stdout_fd = -1,
777 : .stderr_fd = -1,
778 : .exec_fd = -1,
779 : };
780 : pid_t pid;
781 : int r;
782 :
783 0 : assert(m);
784 0 : assert(c);
785 0 : assert(_pid);
786 :
787 0 : r = unit_prepare_exec(UNIT(m));
788 0 : if (r < 0)
789 0 : return r;
790 :
791 0 : r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
792 0 : if (r < 0)
793 0 : return r;
794 :
795 0 : r = unit_set_exec_params(UNIT(m), &exec_params);
796 0 : if (r < 0)
797 0 : return r;
798 :
799 0 : r = exec_spawn(UNIT(m),
800 : c,
801 0 : &m->exec_context,
802 : &exec_params,
803 : m->exec_runtime,
804 : &m->dynamic_creds,
805 : &pid);
806 0 : if (r < 0)
807 0 : return r;
808 :
809 0 : r = unit_watch_pid(UNIT(m), pid, true);
810 0 : if (r < 0)
811 0 : return r;
812 :
813 0 : *_pid = pid;
814 :
815 0 : return 0;
816 : }
817 :
818 0 : static void mount_enter_dead(Mount *m, MountResult f) {
819 0 : assert(m);
820 :
821 0 : if (m->result == MOUNT_SUCCESS)
822 0 : m->result = f;
823 :
824 0 : unit_log_result(UNIT(m), m->result == MOUNT_SUCCESS, mount_result_to_string(m->result));
825 0 : mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD);
826 :
827 0 : m->exec_runtime = exec_runtime_unref(m->exec_runtime, true);
828 :
829 0 : exec_context_destroy_runtime_directory(&m->exec_context, UNIT(m)->manager->prefix[EXEC_DIRECTORY_RUNTIME]);
830 :
831 0 : unit_unref_uid_gid(UNIT(m), true);
832 :
833 0 : dynamic_creds_destroy(&m->dynamic_creds);
834 :
835 : /* Any dependencies based on /proc/self/mountinfo are now stale */
836 0 : unit_remove_dependencies(UNIT(m), UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
837 0 : }
838 :
839 0 : static void mount_enter_mounted(Mount *m, MountResult f) {
840 0 : assert(m);
841 :
842 0 : if (m->result == MOUNT_SUCCESS)
843 0 : m->result = f;
844 :
845 0 : mount_set_state(m, MOUNT_MOUNTED);
846 0 : }
847 :
848 0 : static void mount_enter_dead_or_mounted(Mount *m, MountResult f) {
849 0 : assert(m);
850 :
851 : /* Enter DEAD or MOUNTED state, depending on what the kernel currently says about the mount point. We use this
852 : * whenever we executed an operation, so that our internal state reflects what the kernel says again, after all
853 : * ultimately we just mirror the kernel's internal state on this. */
854 :
855 0 : if (m->from_proc_self_mountinfo)
856 0 : mount_enter_mounted(m, f);
857 : else
858 0 : mount_enter_dead(m, f);
859 0 : }
860 :
861 0 : static int state_to_kill_operation(MountState state) {
862 0 : switch (state) {
863 :
864 0 : case MOUNT_REMOUNTING_SIGTERM:
865 : case MOUNT_UNMOUNTING_SIGTERM:
866 0 : return KILL_TERMINATE;
867 :
868 0 : case MOUNT_REMOUNTING_SIGKILL:
869 : case MOUNT_UNMOUNTING_SIGKILL:
870 0 : return KILL_KILL;
871 :
872 0 : default:
873 0 : return _KILL_OPERATION_INVALID;
874 : }
875 : }
876 :
877 0 : static void mount_enter_signal(Mount *m, MountState state, MountResult f) {
878 : int r;
879 :
880 0 : assert(m);
881 :
882 0 : if (m->result == MOUNT_SUCCESS)
883 0 : m->result = f;
884 :
885 0 : r = unit_kill_context(
886 0 : UNIT(m),
887 : &m->kill_context,
888 0 : state_to_kill_operation(state),
889 : -1,
890 : m->control_pid,
891 : false);
892 0 : if (r < 0)
893 0 : goto fail;
894 :
895 0 : if (r > 0) {
896 0 : r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
897 0 : if (r < 0)
898 0 : goto fail;
899 :
900 0 : mount_set_state(m, state);
901 0 : } else if (state == MOUNT_REMOUNTING_SIGTERM && m->kill_context.send_sigkill)
902 0 : mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
903 0 : else if (IN_SET(state, MOUNT_REMOUNTING_SIGTERM, MOUNT_REMOUNTING_SIGKILL))
904 0 : mount_enter_mounted(m, MOUNT_SUCCESS);
905 0 : else if (state == MOUNT_UNMOUNTING_SIGTERM && m->kill_context.send_sigkill)
906 0 : mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS);
907 : else
908 0 : mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
909 :
910 0 : return;
911 :
912 0 : fail:
913 0 : log_unit_warning_errno(UNIT(m), r, "Failed to kill processes: %m");
914 0 : mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
915 : }
916 :
917 0 : static void mount_enter_unmounting(Mount *m) {
918 : int r;
919 :
920 0 : assert(m);
921 :
922 : /* Start counting our attempts */
923 0 : if (!IN_SET(m->state,
924 : MOUNT_UNMOUNTING,
925 : MOUNT_UNMOUNTING_SIGTERM,
926 : MOUNT_UNMOUNTING_SIGKILL))
927 0 : m->n_retry_umount = 0;
928 :
929 0 : m->control_command_id = MOUNT_EXEC_UNMOUNT;
930 0 : m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
931 :
932 0 : r = exec_command_set(m->control_command, UMOUNT_PATH, m->where, "-c", NULL);
933 0 : if (r >= 0 && m->lazy_unmount)
934 0 : r = exec_command_append(m->control_command, "-l", NULL);
935 0 : if (r >= 0 && m->force_unmount)
936 0 : r = exec_command_append(m->control_command, "-f", NULL);
937 0 : if (r < 0)
938 0 : goto fail;
939 :
940 0 : mount_unwatch_control_pid(m);
941 :
942 0 : r = mount_spawn(m, m->control_command, &m->control_pid);
943 0 : if (r < 0)
944 0 : goto fail;
945 :
946 0 : mount_set_state(m, MOUNT_UNMOUNTING);
947 :
948 0 : return;
949 :
950 0 : fail:
951 0 : log_unit_warning_errno(UNIT(m), r, "Failed to run 'umount' task: %m");
952 0 : mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
953 : }
954 :
955 0 : static void mount_enter_mounting(Mount *m) {
956 : int r;
957 : MountParameters *p;
958 :
959 0 : assert(m);
960 :
961 0 : r = unit_fail_if_noncanonical(UNIT(m), m->where);
962 0 : if (r < 0)
963 0 : goto fail;
964 :
965 0 : (void) mkdir_p_label(m->where, m->directory_mode);
966 :
967 0 : unit_warn_if_dir_nonempty(UNIT(m), m->where);
968 0 : unit_warn_leftover_processes(UNIT(m));
969 :
970 0 : m->control_command_id = MOUNT_EXEC_MOUNT;
971 0 : m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
972 :
973 : /* Create the source directory for bind-mounts if needed */
974 0 : p = get_mount_parameters_fragment(m);
975 0 : if (p && mount_is_bind(p))
976 0 : (void) mkdir_p_label(p->what, m->directory_mode);
977 :
978 0 : if (p) {
979 0 : _cleanup_free_ char *opts = NULL;
980 :
981 0 : r = fstab_filter_options(p->options, "nofail\0" "noauto\0" "auto\0", NULL, NULL, &opts);
982 0 : if (r < 0)
983 0 : goto fail;
984 :
985 0 : r = exec_command_set(m->control_command, MOUNT_PATH, p->what, m->where, NULL);
986 0 : if (r >= 0 && m->sloppy_options)
987 0 : r = exec_command_append(m->control_command, "-s", NULL);
988 0 : if (r >= 0 && p->fstype)
989 0 : r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
990 0 : if (r >= 0 && !isempty(opts))
991 0 : r = exec_command_append(m->control_command, "-o", opts, NULL);
992 : } else
993 0 : r = -ENOENT;
994 0 : if (r < 0)
995 0 : goto fail;
996 :
997 0 : mount_unwatch_control_pid(m);
998 :
999 0 : r = mount_spawn(m, m->control_command, &m->control_pid);
1000 0 : if (r < 0)
1001 0 : goto fail;
1002 :
1003 0 : mount_set_state(m, MOUNT_MOUNTING);
1004 :
1005 0 : return;
1006 :
1007 0 : fail:
1008 0 : log_unit_warning_errno(UNIT(m), r, "Failed to run 'mount' task: %m");
1009 0 : mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
1010 : }
1011 :
1012 0 : static void mount_set_reload_result(Mount *m, MountResult result) {
1013 0 : assert(m);
1014 :
1015 : /* Only store the first error we encounter */
1016 0 : if (m->reload_result != MOUNT_SUCCESS)
1017 0 : return;
1018 :
1019 0 : m->reload_result = result;
1020 : }
1021 :
1022 0 : static void mount_enter_remounting(Mount *m) {
1023 : int r;
1024 : MountParameters *p;
1025 :
1026 0 : assert(m);
1027 :
1028 : /* Reset reload result when we are about to start a new remount operation */
1029 0 : m->reload_result = MOUNT_SUCCESS;
1030 :
1031 0 : m->control_command_id = MOUNT_EXEC_REMOUNT;
1032 0 : m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
1033 :
1034 0 : p = get_mount_parameters_fragment(m);
1035 0 : if (p) {
1036 : const char *o;
1037 :
1038 0 : if (p->options)
1039 0 : o = strjoina("remount,", p->options);
1040 : else
1041 0 : o = "remount";
1042 :
1043 0 : r = exec_command_set(m->control_command, MOUNT_PATH,
1044 : p->what, m->where,
1045 : "-o", o, NULL);
1046 0 : if (r >= 0 && m->sloppy_options)
1047 0 : r = exec_command_append(m->control_command, "-s", NULL);
1048 0 : if (r >= 0 && p->fstype)
1049 0 : r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
1050 : } else
1051 0 : r = -ENOENT;
1052 0 : if (r < 0)
1053 0 : goto fail;
1054 :
1055 0 : mount_unwatch_control_pid(m);
1056 :
1057 0 : r = mount_spawn(m, m->control_command, &m->control_pid);
1058 0 : if (r < 0)
1059 0 : goto fail;
1060 :
1061 0 : mount_set_state(m, MOUNT_REMOUNTING);
1062 :
1063 0 : return;
1064 :
1065 0 : fail:
1066 0 : log_unit_warning_errno(UNIT(m), r, "Failed to run 'remount' task: %m");
1067 0 : mount_set_reload_result(m, MOUNT_FAILURE_RESOURCES);
1068 0 : mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1069 : }
1070 :
1071 0 : static void mount_cycle_clear(Mount *m) {
1072 0 : assert(m);
1073 :
1074 : /* Clear all state we shall forget for this new cycle */
1075 :
1076 0 : m->result = MOUNT_SUCCESS;
1077 0 : m->reload_result = MOUNT_SUCCESS;
1078 0 : exec_command_reset_status_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
1079 0 : UNIT(m)->reset_accounting = true;
1080 0 : }
1081 :
1082 0 : static int mount_start(Unit *u) {
1083 0 : Mount *m = MOUNT(u);
1084 : int r;
1085 :
1086 0 : assert(m);
1087 :
1088 : /* We cannot fulfill this request right now, try again later
1089 : * please! */
1090 0 : if (IN_SET(m->state,
1091 : MOUNT_UNMOUNTING,
1092 : MOUNT_UNMOUNTING_SIGTERM,
1093 : MOUNT_UNMOUNTING_SIGKILL))
1094 0 : return -EAGAIN;
1095 :
1096 : /* Already on it! */
1097 0 : if (m->state == MOUNT_MOUNTING)
1098 0 : return 0;
1099 :
1100 0 : assert(IN_SET(m->state, MOUNT_DEAD, MOUNT_FAILED));
1101 :
1102 0 : r = unit_test_start_limit(u);
1103 0 : if (r < 0) {
1104 0 : mount_enter_dead(m, MOUNT_FAILURE_START_LIMIT_HIT);
1105 0 : return r;
1106 : }
1107 :
1108 0 : r = unit_acquire_invocation_id(u);
1109 0 : if (r < 0)
1110 0 : return r;
1111 :
1112 0 : mount_cycle_clear(m);
1113 0 : mount_enter_mounting(m);
1114 :
1115 0 : return 1;
1116 : }
1117 :
1118 0 : static int mount_stop(Unit *u) {
1119 0 : Mount *m = MOUNT(u);
1120 :
1121 0 : assert(m);
1122 :
1123 0 : switch (m->state) {
1124 :
1125 0 : case MOUNT_UNMOUNTING:
1126 : case MOUNT_UNMOUNTING_SIGKILL:
1127 : case MOUNT_UNMOUNTING_SIGTERM:
1128 : /* Already on it */
1129 0 : return 0;
1130 :
1131 0 : case MOUNT_MOUNTING:
1132 : case MOUNT_MOUNTING_DONE:
1133 : case MOUNT_REMOUNTING:
1134 : /* If we are still waiting for /bin/mount, we go directly into kill mode. */
1135 0 : mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_SUCCESS);
1136 0 : return 0;
1137 :
1138 0 : case MOUNT_REMOUNTING_SIGTERM:
1139 : /* If we are already waiting for a hung remount, convert this to the matching unmounting state */
1140 0 : mount_set_state(m, MOUNT_UNMOUNTING_SIGTERM);
1141 0 : return 0;
1142 :
1143 0 : case MOUNT_REMOUNTING_SIGKILL:
1144 : /* as above */
1145 0 : mount_set_state(m, MOUNT_UNMOUNTING_SIGKILL);
1146 0 : return 0;
1147 :
1148 0 : case MOUNT_MOUNTED:
1149 0 : mount_enter_unmounting(m);
1150 0 : return 1;
1151 :
1152 0 : default:
1153 0 : assert_not_reached("Unexpected state.");
1154 : }
1155 : }
1156 :
1157 0 : static int mount_reload(Unit *u) {
1158 0 : Mount *m = MOUNT(u);
1159 :
1160 0 : assert(m);
1161 0 : assert(m->state == MOUNT_MOUNTED);
1162 :
1163 0 : mount_enter_remounting(m);
1164 :
1165 0 : return 1;
1166 : }
1167 :
1168 0 : static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
1169 0 : Mount *m = MOUNT(u);
1170 :
1171 0 : assert(m);
1172 0 : assert(f);
1173 0 : assert(fds);
1174 :
1175 0 : (void) serialize_item(f, "state", mount_state_to_string(m->state));
1176 0 : (void) serialize_item(f, "result", mount_result_to_string(m->result));
1177 0 : (void) serialize_item(f, "reload-result", mount_result_to_string(m->reload_result));
1178 0 : (void) serialize_item_format(f, "n-retry-umount", "%u", m->n_retry_umount);
1179 :
1180 0 : if (m->control_pid > 0)
1181 0 : (void) serialize_item_format(f, "control-pid", PID_FMT, m->control_pid);
1182 :
1183 0 : if (m->control_command_id >= 0)
1184 0 : (void) serialize_item(f, "control-command", mount_exec_command_to_string(m->control_command_id));
1185 :
1186 0 : return 0;
1187 : }
1188 :
1189 0 : static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1190 0 : Mount *m = MOUNT(u);
1191 : int r;
1192 :
1193 0 : assert(u);
1194 0 : assert(key);
1195 0 : assert(value);
1196 0 : assert(fds);
1197 :
1198 0 : if (streq(key, "state")) {
1199 : MountState state;
1200 :
1201 0 : if ((state = mount_state_from_string(value)) < 0)
1202 0 : log_unit_debug(u, "Failed to parse state value: %s", value);
1203 : else
1204 0 : m->deserialized_state = state;
1205 :
1206 0 : } else if (streq(key, "result")) {
1207 : MountResult f;
1208 :
1209 0 : f = mount_result_from_string(value);
1210 0 : if (f < 0)
1211 0 : log_unit_debug(u, "Failed to parse result value: %s", value);
1212 0 : else if (f != MOUNT_SUCCESS)
1213 0 : m->result = f;
1214 :
1215 0 : } else if (streq(key, "reload-result")) {
1216 : MountResult f;
1217 :
1218 0 : f = mount_result_from_string(value);
1219 0 : if (f < 0)
1220 0 : log_unit_debug(u, "Failed to parse reload result value: %s", value);
1221 0 : else if (f != MOUNT_SUCCESS)
1222 0 : m->reload_result = f;
1223 :
1224 0 : } else if (streq(key, "n-retry-umount")) {
1225 :
1226 0 : r = safe_atou(value, &m->n_retry_umount);
1227 0 : if (r < 0)
1228 0 : log_unit_debug(u, "Failed to parse n-retry-umount value: %s", value);
1229 :
1230 0 : } else if (streq(key, "control-pid")) {
1231 :
1232 0 : if (parse_pid(value, &m->control_pid) < 0)
1233 0 : log_unit_debug(u, "Failed to parse control-pid value: %s", value);
1234 :
1235 0 : } else if (streq(key, "control-command")) {
1236 : MountExecCommand id;
1237 :
1238 0 : id = mount_exec_command_from_string(value);
1239 0 : if (id < 0)
1240 0 : log_unit_debug(u, "Failed to parse exec-command value: %s", value);
1241 : else {
1242 0 : m->control_command_id = id;
1243 0 : m->control_command = m->exec_command + id;
1244 : }
1245 : } else
1246 0 : log_unit_debug(u, "Unknown serialization key: %s", key);
1247 :
1248 0 : return 0;
1249 : }
1250 :
1251 2487 : _pure_ static UnitActiveState mount_active_state(Unit *u) {
1252 2487 : assert(u);
1253 :
1254 2487 : return state_translation_table[MOUNT(u)->state];
1255 : }
1256 :
1257 0 : _pure_ static const char *mount_sub_state_to_string(Unit *u) {
1258 0 : assert(u);
1259 :
1260 0 : return mount_state_to_string(MOUNT(u)->state);
1261 : }
1262 :
1263 586 : _pure_ static bool mount_may_gc(Unit *u) {
1264 586 : Mount *m = MOUNT(u);
1265 :
1266 586 : assert(m);
1267 :
1268 586 : if (m->from_proc_self_mountinfo)
1269 154 : return false;
1270 :
1271 432 : return true;
1272 : }
1273 :
1274 0 : static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1275 0 : Mount *m = MOUNT(u);
1276 : MountResult f;
1277 :
1278 0 : assert(m);
1279 0 : assert(pid >= 0);
1280 :
1281 0 : if (pid != m->control_pid)
1282 0 : return;
1283 :
1284 : /* So here's the thing, we really want to know before /usr/bin/mount or /usr/bin/umount exit whether
1285 : * they established/remove a mount. This is important when mounting, but even more so when unmounting
1286 : * since we need to deal with nested mounts and otherwise cannot safely determine whether to repeat
1287 : * the unmounts. In theory, the kernel fires /proc/self/mountinfo changes off before returning from
1288 : * the mount() or umount() syscalls, and thus we should see the changes to the proc file before we
1289 : * process the waitid() for the /usr/bin/(u)mount processes. However, this is unfortunately racy: we
1290 : * have to waitid() for processes using P_ALL (since we need to reap unexpected children that got
1291 : * reparented to PID 1), but when using P_ALL we might end up reaping processes that terminated just
1292 : * instants ago, i.e. already after our last event loop iteration (i.e. after the last point we might
1293 : * have noticed /proc/self/mountinfo events via epoll). This means event loop priorities for
1294 : * processing SIGCHLD vs. /proc/self/mountinfo IO events are not as relevant as we want. To fix that
1295 : * race, let's explicitly scan /proc/self/mountinfo before we start processing /usr/bin/(u)mount
1296 : * dying. It's ugly, but it makes our ordering systematic again, and makes sure we always see
1297 : * /proc/self/mountinfo changes before our mount/umount exits. */
1298 0 : (void) mount_process_proc_self_mountinfo(u->manager);
1299 :
1300 0 : m->control_pid = 0;
1301 :
1302 0 : if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
1303 0 : f = MOUNT_SUCCESS;
1304 0 : else if (code == CLD_EXITED)
1305 0 : f = MOUNT_FAILURE_EXIT_CODE;
1306 0 : else if (code == CLD_KILLED)
1307 0 : f = MOUNT_FAILURE_SIGNAL;
1308 0 : else if (code == CLD_DUMPED)
1309 0 : f = MOUNT_FAILURE_CORE_DUMP;
1310 : else
1311 0 : assert_not_reached("Unknown code");
1312 :
1313 0 : if (IN_SET(m->state, MOUNT_REMOUNTING, MOUNT_REMOUNTING_SIGKILL, MOUNT_REMOUNTING_SIGTERM))
1314 0 : mount_set_reload_result(m, f);
1315 0 : else if (m->result == MOUNT_SUCCESS)
1316 0 : m->result = f;
1317 :
1318 0 : if (m->control_command) {
1319 0 : exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status);
1320 :
1321 0 : m->control_command = NULL;
1322 0 : m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1323 : }
1324 :
1325 0 : unit_log_process_exit(
1326 : u,
1327 : "Mount process",
1328 : mount_exec_command_to_string(m->control_command_id),
1329 : f == MOUNT_SUCCESS,
1330 : code, status);
1331 :
1332 : /* Note that due to the io event priority logic, we can be sure the new mountinfo is loaded
1333 : * before we process the SIGCHLD for the mount command. */
1334 :
1335 0 : switch (m->state) {
1336 :
1337 0 : case MOUNT_MOUNTING:
1338 : /* Our mount point has not appeared in mountinfo. Something went wrong. */
1339 :
1340 0 : if (f == MOUNT_SUCCESS) {
1341 : /* Either /bin/mount has an unexpected definition of success,
1342 : * or someone raced us and we lost. */
1343 0 : log_unit_warning(UNIT(m), "Mount process finished, but there is no mount.");
1344 0 : f = MOUNT_FAILURE_PROTOCOL;
1345 : }
1346 0 : mount_enter_dead(m, f);
1347 0 : break;
1348 :
1349 0 : case MOUNT_MOUNTING_DONE:
1350 0 : mount_enter_mounted(m, f);
1351 0 : break;
1352 :
1353 0 : case MOUNT_REMOUNTING:
1354 : case MOUNT_REMOUNTING_SIGTERM:
1355 : case MOUNT_REMOUNTING_SIGKILL:
1356 0 : mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1357 0 : break;
1358 :
1359 0 : case MOUNT_UNMOUNTING:
1360 :
1361 0 : if (f == MOUNT_SUCCESS && m->from_proc_self_mountinfo) {
1362 :
1363 : /* Still a mount point? If so, let's try again. Most likely there were multiple mount points
1364 : * stacked on top of each other. We might exceed the timeout specified by the user overall,
1365 : * but we will stop as soon as any one umount times out. */
1366 :
1367 0 : if (m->n_retry_umount < RETRY_UMOUNT_MAX) {
1368 0 : log_unit_debug(u, "Mount still present, trying again.");
1369 0 : m->n_retry_umount++;
1370 0 : mount_enter_unmounting(m);
1371 : } else {
1372 0 : log_unit_warning(u, "Mount still present after %u attempts to unmount, giving up.", m->n_retry_umount);
1373 0 : mount_enter_mounted(m, f);
1374 : }
1375 : } else
1376 0 : mount_enter_dead_or_mounted(m, f);
1377 :
1378 0 : break;
1379 :
1380 0 : case MOUNT_UNMOUNTING_SIGKILL:
1381 : case MOUNT_UNMOUNTING_SIGTERM:
1382 0 : mount_enter_dead_or_mounted(m, f);
1383 0 : break;
1384 :
1385 0 : default:
1386 0 : assert_not_reached("Uh, control process died at wrong time.");
1387 : }
1388 :
1389 : /* Notify clients about changed exit status */
1390 0 : unit_add_to_dbus_queue(u);
1391 : }
1392 :
1393 0 : static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
1394 0 : Mount *m = MOUNT(userdata);
1395 :
1396 0 : assert(m);
1397 0 : assert(m->timer_event_source == source);
1398 :
1399 0 : switch (m->state) {
1400 :
1401 0 : case MOUNT_MOUNTING:
1402 : case MOUNT_MOUNTING_DONE:
1403 0 : log_unit_warning(UNIT(m), "Mounting timed out. Terminating.");
1404 0 : mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1405 0 : break;
1406 :
1407 0 : case MOUNT_REMOUNTING:
1408 0 : log_unit_warning(UNIT(m), "Remounting timed out. Terminating remount process.");
1409 0 : mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1410 0 : mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, MOUNT_SUCCESS);
1411 0 : break;
1412 :
1413 0 : case MOUNT_REMOUNTING_SIGTERM:
1414 0 : mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1415 :
1416 0 : if (m->kill_context.send_sigkill) {
1417 0 : log_unit_warning(UNIT(m), "Remounting timed out. Killing.");
1418 0 : mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
1419 : } else {
1420 0 : log_unit_warning(UNIT(m), "Remounting timed out. Skipping SIGKILL. Ignoring.");
1421 0 : mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1422 : }
1423 0 : break;
1424 :
1425 0 : case MOUNT_REMOUNTING_SIGKILL:
1426 0 : mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1427 :
1428 0 : log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
1429 0 : mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1430 0 : break;
1431 :
1432 0 : case MOUNT_UNMOUNTING:
1433 0 : log_unit_warning(UNIT(m), "Unmounting timed out. Terminating.");
1434 0 : mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1435 0 : break;
1436 :
1437 0 : case MOUNT_UNMOUNTING_SIGTERM:
1438 0 : if (m->kill_context.send_sigkill) {
1439 0 : log_unit_warning(UNIT(m), "Mount process timed out. Killing.");
1440 0 : mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
1441 : } else {
1442 0 : log_unit_warning(UNIT(m), "Mount process timed out. Skipping SIGKILL. Ignoring.");
1443 0 : mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
1444 : }
1445 0 : break;
1446 :
1447 0 : case MOUNT_UNMOUNTING_SIGKILL:
1448 0 : log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
1449 0 : mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
1450 0 : break;
1451 :
1452 0 : default:
1453 0 : assert_not_reached("Timeout at wrong time.");
1454 : }
1455 :
1456 0 : return 0;
1457 : }
1458 :
1459 154 : static int mount_setup_new_unit(
1460 : Manager *m,
1461 : const char *name,
1462 : const char *what,
1463 : const char *where,
1464 : const char *options,
1465 : const char *fstype,
1466 : MountProcFlags *ret_flags,
1467 : Unit **ret) {
1468 :
1469 154 : _cleanup_(unit_freep) Unit *u = NULL;
1470 : int r;
1471 :
1472 154 : assert(m);
1473 154 : assert(name);
1474 154 : assert(ret_flags);
1475 154 : assert(ret);
1476 :
1477 154 : r = unit_new_for_name(m, sizeof(Mount), name, &u);
1478 154 : if (r < 0)
1479 0 : return r;
1480 :
1481 154 : r = free_and_strdup(&u->source_path, "/proc/self/mountinfo");
1482 154 : if (r < 0)
1483 0 : return r;
1484 :
1485 154 : r = free_and_strdup(&MOUNT(u)->where, where);
1486 154 : if (r < 0)
1487 0 : return r;
1488 :
1489 154 : r = update_parameters_proc_self_mountinfo(MOUNT(u), what, options, fstype);
1490 154 : if (r < 0)
1491 0 : return r;
1492 :
1493 : /* This unit was generated because /proc/self/mountinfo reported it. Remember this, so that by the time we load
1494 : * the unit file for it (and thus add in extra deps right after) we know what source to attributes the deps
1495 : * to.*/
1496 154 : MOUNT(u)->from_proc_self_mountinfo = true;
1497 :
1498 : /* We have only allocated the stub now, let's enqueue this unit for loading now, so that everything else is
1499 : * loaded in now. */
1500 154 : unit_add_to_load_queue(u);
1501 :
1502 154 : *ret_flags = MOUNT_PROC_IS_MOUNTED | MOUNT_PROC_JUST_MOUNTED | MOUNT_PROC_JUST_CHANGED;
1503 154 : *ret = TAKE_PTR(u);
1504 154 : return 0;
1505 : }
1506 :
1507 11 : static int mount_setup_existing_unit(
1508 : Unit *u,
1509 : const char *what,
1510 : const char *where,
1511 : const char *options,
1512 : const char *fstype,
1513 : MountProcFlags *ret_flags) {
1514 :
1515 11 : MountProcFlags flags = MOUNT_PROC_IS_MOUNTED;
1516 : int r;
1517 :
1518 11 : assert(u);
1519 11 : assert(flags);
1520 :
1521 11 : if (!MOUNT(u)->where) {
1522 11 : MOUNT(u)->where = strdup(where);
1523 11 : if (!MOUNT(u)->where)
1524 0 : return -ENOMEM;
1525 : }
1526 :
1527 11 : r = update_parameters_proc_self_mountinfo(MOUNT(u), what, options, fstype);
1528 11 : if (r < 0)
1529 0 : return r;
1530 11 : if (r > 0)
1531 11 : flags |= MOUNT_PROC_JUST_CHANGED;
1532 :
1533 11 : if (!MOUNT(u)->from_proc_self_mountinfo || FLAGS_SET(MOUNT(u)->proc_flags, MOUNT_PROC_JUST_MOUNTED))
1534 11 : flags |= MOUNT_PROC_JUST_MOUNTED;
1535 :
1536 11 : MOUNT(u)->from_proc_self_mountinfo = true;
1537 :
1538 11 : if (IN_SET(u->load_state, UNIT_NOT_FOUND, UNIT_BAD_SETTING, UNIT_ERROR)) {
1539 : /* The unit was previously not found or otherwise not loaded. Now that the unit shows up in
1540 : * /proc/self/mountinfo we should reconsider it this, hence set it to UNIT_LOADED. */
1541 0 : u->load_state = UNIT_LOADED;
1542 0 : u->load_error = 0;
1543 :
1544 0 : flags |= MOUNT_PROC_JUST_CHANGED;
1545 : }
1546 :
1547 11 : if (FLAGS_SET(flags, MOUNT_PROC_JUST_CHANGED)) {
1548 : /* If things changed, then make sure that all deps are regenerated. Let's
1549 : * first remove all automatic deps, and then add in the new ones. */
1550 :
1551 11 : unit_remove_dependencies(u, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
1552 :
1553 11 : r = mount_add_extras(MOUNT(u));
1554 11 : if (r < 0)
1555 0 : return r;
1556 : }
1557 :
1558 11 : *ret_flags = flags;
1559 11 : return 0;
1560 : }
1561 :
1562 429 : static int mount_setup_unit(
1563 : Manager *m,
1564 : const char *what,
1565 : const char *where,
1566 : const char *options,
1567 : const char *fstype,
1568 : bool set_flags) {
1569 :
1570 429 : _cleanup_free_ char *e = NULL;
1571 : MountProcFlags flags;
1572 : Unit *u;
1573 : int r;
1574 :
1575 429 : assert(m);
1576 429 : assert(what);
1577 429 : assert(where);
1578 429 : assert(options);
1579 429 : assert(fstype);
1580 :
1581 : /* Ignore API mount points. They should never be referenced in
1582 : * dependencies ever. */
1583 429 : if (mount_point_is_api(where) || mount_point_ignore(where))
1584 253 : return 0;
1585 :
1586 176 : if (streq(fstype, "autofs"))
1587 11 : return 0;
1588 :
1589 : /* probably some kind of swap, ignore */
1590 165 : if (!is_path(where))
1591 0 : return 0;
1592 :
1593 165 : r = unit_name_from_path(where, ".mount", &e);
1594 165 : if (r < 0)
1595 0 : return log_error_errno(r, "Failed to generate unit name from path '%s': %m", where);
1596 :
1597 165 : u = manager_get_unit(m, e);
1598 165 : if (u)
1599 11 : r = mount_setup_existing_unit(u, what, where, options, fstype, &flags);
1600 : else
1601 : /* First time we see this mount point meaning that it's not been initiated by a mount unit but rather
1602 : * by the sysadmin having called mount(8) directly. */
1603 154 : r = mount_setup_new_unit(m, e, what, where, options, fstype, &flags, &u);
1604 165 : if (r < 0)
1605 0 : return log_warning_errno(r, "Failed to set up mount unit: %m");
1606 :
1607 : /* If the mount changed properties or state, let's notify our clients */
1608 165 : if (flags & (MOUNT_PROC_JUST_CHANGED|MOUNT_PROC_JUST_MOUNTED))
1609 165 : unit_add_to_dbus_queue(u);
1610 :
1611 165 : if (set_flags)
1612 0 : MOUNT(u)->proc_flags = flags;
1613 :
1614 165 : return 0;
1615 : }
1616 :
1617 11 : static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1618 11 : _cleanup_(mnt_free_tablep) struct libmnt_table *table = NULL;
1619 11 : _cleanup_(mnt_free_iterp) struct libmnt_iter *iter = NULL;
1620 : int r;
1621 :
1622 11 : assert(m);
1623 :
1624 11 : r = libmount_parse(NULL, NULL, &table, &iter);
1625 11 : if (r < 0)
1626 0 : return log_error_errno(r, "Failed to parse /proc/self/mountinfo: %m");
1627 :
1628 429 : for (;;) {
1629 : struct libmnt_fs *fs;
1630 : const char *device, *path, *options, *fstype;
1631 :
1632 440 : r = mnt_table_next_fs(table, iter, &fs);
1633 440 : if (r == 1)
1634 11 : break;
1635 429 : if (r < 0)
1636 0 : return log_error_errno(r, "Failed to get next entry from /proc/self/mountinfo: %m");
1637 :
1638 429 : device = mnt_fs_get_source(fs);
1639 429 : path = mnt_fs_get_target(fs);
1640 429 : options = mnt_fs_get_options(fs);
1641 429 : fstype = mnt_fs_get_fstype(fs);
1642 :
1643 429 : if (!device || !path)
1644 0 : continue;
1645 :
1646 429 : device_found_node(m, device, DEVICE_FOUND_MOUNT, DEVICE_FOUND_MOUNT);
1647 :
1648 429 : (void) mount_setup_unit(m, device, path, options, fstype, set_flags);
1649 : }
1650 :
1651 11 : return 0;
1652 : }
1653 :
1654 14 : static void mount_shutdown(Manager *m) {
1655 14 : assert(m);
1656 :
1657 14 : m->mount_event_source = sd_event_source_unref(m->mount_event_source);
1658 :
1659 14 : mnt_unref_monitor(m->mount_monitor);
1660 14 : m->mount_monitor = NULL;
1661 14 : }
1662 :
1663 0 : static int mount_get_timeout(Unit *u, usec_t *timeout) {
1664 0 : Mount *m = MOUNT(u);
1665 : usec_t t;
1666 : int r;
1667 :
1668 0 : if (!m->timer_event_source)
1669 0 : return 0;
1670 :
1671 0 : r = sd_event_source_get_time(m->timer_event_source, &t);
1672 0 : if (r < 0)
1673 0 : return r;
1674 0 : if (t == USEC_INFINITY)
1675 0 : return 0;
1676 :
1677 0 : *timeout = t;
1678 0 : return 1;
1679 : }
1680 :
1681 11 : static void mount_enumerate_perpetual(Manager *m) {
1682 : Unit *u;
1683 : int r;
1684 :
1685 11 : assert(m);
1686 :
1687 : /* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's
1688 : * unconditionally synthesize it here and mark it as perpetual. */
1689 :
1690 11 : u = manager_get_unit(m, SPECIAL_ROOT_MOUNT);
1691 11 : if (!u) {
1692 11 : r = unit_new_for_name(m, sizeof(Mount), SPECIAL_ROOT_MOUNT, &u);
1693 11 : if (r < 0) {
1694 0 : log_error_errno(r, "Failed to allocate the special " SPECIAL_ROOT_MOUNT " unit: %m");
1695 0 : return;
1696 : }
1697 : }
1698 :
1699 11 : u->perpetual = true;
1700 11 : MOUNT(u)->deserialized_state = MOUNT_MOUNTED;
1701 :
1702 11 : unit_add_to_load_queue(u);
1703 11 : unit_add_to_dbus_queue(u);
1704 : }
1705 :
1706 0 : static bool mount_is_mounted(Mount *m) {
1707 0 : assert(m);
1708 :
1709 0 : return UNIT(m)->perpetual || FLAGS_SET(m->proc_flags, MOUNT_PROC_IS_MOUNTED);
1710 : }
1711 :
1712 11 : static void mount_enumerate(Manager *m) {
1713 : int r;
1714 :
1715 11 : assert(m);
1716 :
1717 11 : mnt_init_debug(0);
1718 :
1719 11 : if (!m->mount_monitor) {
1720 : int fd;
1721 :
1722 11 : m->mount_monitor = mnt_new_monitor();
1723 11 : if (!m->mount_monitor) {
1724 0 : log_oom();
1725 0 : goto fail;
1726 : }
1727 :
1728 11 : r = mnt_monitor_enable_kernel(m->mount_monitor, 1);
1729 11 : if (r < 0) {
1730 0 : log_error_errno(r, "Failed to enable watching of kernel mount events: %m");
1731 0 : goto fail;
1732 : }
1733 :
1734 11 : r = mnt_monitor_enable_userspace(m->mount_monitor, 1, NULL);
1735 11 : if (r < 0) {
1736 0 : log_error_errno(r, "Failed to enable watching of userspace mount events: %m");
1737 0 : goto fail;
1738 : }
1739 :
1740 : /* mnt_unref_monitor() will close the fd */
1741 11 : fd = r = mnt_monitor_get_fd(m->mount_monitor);
1742 11 : if (r < 0) {
1743 0 : log_error_errno(r, "Failed to acquire watch file descriptor: %m");
1744 0 : goto fail;
1745 : }
1746 :
1747 11 : r = sd_event_add_io(m->event, &m->mount_event_source, fd, EPOLLIN, mount_dispatch_io, m);
1748 11 : if (r < 0) {
1749 0 : log_error_errno(r, "Failed to watch mount file descriptor: %m");
1750 0 : goto fail;
1751 : }
1752 :
1753 11 : r = sd_event_source_set_priority(m->mount_event_source, SD_EVENT_PRIORITY_NORMAL-10);
1754 11 : if (r < 0) {
1755 0 : log_error_errno(r, "Failed to adjust mount watch priority: %m");
1756 0 : goto fail;
1757 : }
1758 :
1759 11 : (void) sd_event_source_set_description(m->mount_event_source, "mount-monitor-dispatch");
1760 : }
1761 :
1762 11 : r = mount_load_proc_self_mountinfo(m, false);
1763 11 : if (r < 0)
1764 0 : goto fail;
1765 :
1766 11 : return;
1767 :
1768 0 : fail:
1769 0 : mount_shutdown(m);
1770 : }
1771 :
1772 0 : static int drain_libmount(Manager *m) {
1773 0 : bool rescan = false;
1774 : int r;
1775 :
1776 0 : assert(m);
1777 :
1778 : /* Drain all events and verify that the event is valid.
1779 : *
1780 : * Note that libmount also monitors /run/mount mkdir if the directory does not exist yet. The mkdir
1781 : * may generate event which is irrelevant for us.
1782 : *
1783 : * error: r < 0; valid: r == 0, false positive: r == 1 */
1784 : do {
1785 0 : r = mnt_monitor_next_change(m->mount_monitor, NULL, NULL);
1786 0 : if (r < 0)
1787 0 : return log_error_errno(r, "Failed to drain libmount events: %m");
1788 0 : if (r == 0)
1789 0 : rescan = true;
1790 0 : } while (r == 0);
1791 :
1792 0 : return rescan;
1793 : }
1794 :
1795 0 : static int mount_process_proc_self_mountinfo(Manager *m) {
1796 0 : _cleanup_set_free_free_ Set *around = NULL, *gone = NULL;
1797 : const char *what;
1798 : Iterator i;
1799 : Unit *u;
1800 : int r;
1801 :
1802 0 : assert(m);
1803 :
1804 0 : r = drain_libmount(m);
1805 0 : if (r <= 0)
1806 0 : return r;
1807 :
1808 0 : r = mount_load_proc_self_mountinfo(m, true);
1809 0 : if (r < 0) {
1810 : /* Reset flags, just in case, for later calls */
1811 0 : LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT])
1812 0 : MOUNT(u)->proc_flags = 0;
1813 :
1814 0 : return 0;
1815 : }
1816 :
1817 0 : manager_dispatch_load_queue(m);
1818 :
1819 0 : LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1820 0 : Mount *mount = MOUNT(u);
1821 :
1822 0 : if (!mount_is_mounted(mount)) {
1823 :
1824 : /* A mount point is not around right now. It
1825 : * might be gone, or might never have
1826 : * existed. */
1827 :
1828 0 : if (mount->from_proc_self_mountinfo &&
1829 0 : mount->parameters_proc_self_mountinfo.what) {
1830 :
1831 : /* Remember that this device might just have disappeared */
1832 0 : if (set_ensure_allocated(&gone, &path_hash_ops) < 0 ||
1833 0 : set_put_strdup(gone, mount->parameters_proc_self_mountinfo.what) < 0)
1834 0 : log_oom(); /* we don't care too much about OOM here... */
1835 : }
1836 :
1837 0 : mount->from_proc_self_mountinfo = false;
1838 0 : assert_se(update_parameters_proc_self_mountinfo(mount, NULL, NULL, NULL) >= 0);
1839 :
1840 0 : switch (mount->state) {
1841 :
1842 0 : case MOUNT_MOUNTED:
1843 : /* This has just been unmounted by somebody else, follow the state change. */
1844 0 : mount_enter_dead(mount, MOUNT_SUCCESS);
1845 0 : break;
1846 :
1847 0 : default:
1848 0 : break;
1849 : }
1850 :
1851 0 : } else if (mount->proc_flags & (MOUNT_PROC_JUST_MOUNTED|MOUNT_PROC_JUST_CHANGED)) {
1852 :
1853 : /* A mount point was added or changed */
1854 :
1855 0 : switch (mount->state) {
1856 :
1857 0 : case MOUNT_DEAD:
1858 : case MOUNT_FAILED:
1859 :
1860 : /* This has just been mounted by somebody else, follow the state change, but let's
1861 : * generate a new invocation ID for this implicitly and automatically. */
1862 0 : (void) unit_acquire_invocation_id(u);
1863 0 : mount_cycle_clear(mount);
1864 0 : mount_enter_mounted(mount, MOUNT_SUCCESS);
1865 0 : break;
1866 :
1867 0 : case MOUNT_MOUNTING:
1868 0 : mount_set_state(mount, MOUNT_MOUNTING_DONE);
1869 0 : break;
1870 :
1871 0 : default:
1872 : /* Nothing really changed, but let's
1873 : * issue an notification call
1874 : * nonetheless, in case somebody is
1875 : * waiting for this. (e.g. file system
1876 : * ro/rw remounts.) */
1877 0 : mount_set_state(mount, mount->state);
1878 0 : break;
1879 : }
1880 0 : }
1881 :
1882 0 : if (mount_is_mounted(mount) &&
1883 0 : mount->from_proc_self_mountinfo &&
1884 0 : mount->parameters_proc_self_mountinfo.what) {
1885 : /* Track devices currently used */
1886 :
1887 0 : if (set_ensure_allocated(&around, &path_hash_ops) < 0 ||
1888 0 : set_put_strdup(around, mount->parameters_proc_self_mountinfo.what) < 0)
1889 0 : log_oom();
1890 : }
1891 :
1892 : /* Reset the flags for later calls */
1893 0 : mount->proc_flags = 0;
1894 : }
1895 :
1896 0 : SET_FOREACH(what, gone, i) {
1897 0 : if (set_contains(around, what))
1898 0 : continue;
1899 :
1900 : /* Let the device units know that the device is no longer mounted */
1901 0 : device_found_node(m, what, 0, DEVICE_FOUND_MOUNT);
1902 : }
1903 :
1904 0 : return 0;
1905 : }
1906 :
1907 0 : static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
1908 0 : Manager *m = userdata;
1909 :
1910 0 : assert(m);
1911 0 : assert(revents & EPOLLIN);
1912 :
1913 0 : return mount_process_proc_self_mountinfo(m);
1914 : }
1915 :
1916 0 : static void mount_reset_failed(Unit *u) {
1917 0 : Mount *m = MOUNT(u);
1918 :
1919 0 : assert(m);
1920 :
1921 0 : if (m->state == MOUNT_FAILED)
1922 0 : mount_set_state(m, MOUNT_DEAD);
1923 :
1924 0 : m->result = MOUNT_SUCCESS;
1925 0 : m->reload_result = MOUNT_SUCCESS;
1926 0 : }
1927 :
1928 0 : static int mount_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
1929 0 : Mount *m = MOUNT(u);
1930 :
1931 0 : assert(m);
1932 :
1933 0 : return unit_kill_common(u, who, signo, -1, m->control_pid, error);
1934 : }
1935 :
1936 0 : static int mount_control_pid(Unit *u) {
1937 0 : Mount *m = MOUNT(u);
1938 :
1939 0 : assert(m);
1940 :
1941 0 : return m->control_pid;
1942 : }
1943 :
1944 : static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1945 : [MOUNT_EXEC_MOUNT] = "ExecMount",
1946 : [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1947 : [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1948 : };
1949 :
1950 10 : DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1951 :
1952 : static const char* const mount_result_table[_MOUNT_RESULT_MAX] = {
1953 : [MOUNT_SUCCESS] = "success",
1954 : [MOUNT_FAILURE_RESOURCES] = "resources",
1955 : [MOUNT_FAILURE_TIMEOUT] = "timeout",
1956 : [MOUNT_FAILURE_EXIT_CODE] = "exit-code",
1957 : [MOUNT_FAILURE_SIGNAL] = "signal",
1958 : [MOUNT_FAILURE_CORE_DUMP] = "core-dump",
1959 : [MOUNT_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
1960 : [MOUNT_FAILURE_PROTOCOL] = "protocol",
1961 : };
1962 :
1963 110 : DEFINE_STRING_TABLE_LOOKUP(mount_result, MountResult);
1964 :
1965 : const UnitVTable mount_vtable = {
1966 : .object_size = sizeof(Mount),
1967 : .exec_context_offset = offsetof(Mount, exec_context),
1968 : .cgroup_context_offset = offsetof(Mount, cgroup_context),
1969 : .kill_context_offset = offsetof(Mount, kill_context),
1970 : .exec_runtime_offset = offsetof(Mount, exec_runtime),
1971 : .dynamic_creds_offset = offsetof(Mount, dynamic_creds),
1972 :
1973 : .sections =
1974 : "Unit\0"
1975 : "Mount\0"
1976 : "Install\0",
1977 : .private_section = "Mount",
1978 :
1979 : .init = mount_init,
1980 : .load = mount_load,
1981 : .done = mount_done,
1982 :
1983 : .coldplug = mount_coldplug,
1984 :
1985 : .dump = mount_dump,
1986 :
1987 : .start = mount_start,
1988 : .stop = mount_stop,
1989 : .reload = mount_reload,
1990 :
1991 : .kill = mount_kill,
1992 :
1993 : .serialize = mount_serialize,
1994 : .deserialize_item = mount_deserialize_item,
1995 :
1996 : .active_state = mount_active_state,
1997 : .sub_state_to_string = mount_sub_state_to_string,
1998 :
1999 : .may_gc = mount_may_gc,
2000 :
2001 : .sigchld_event = mount_sigchld_event,
2002 :
2003 : .reset_failed = mount_reset_failed,
2004 :
2005 : .control_pid = mount_control_pid,
2006 :
2007 : .bus_vtable = bus_mount_vtable,
2008 : .bus_set_property = bus_mount_set_property,
2009 : .bus_commit_properties = bus_mount_commit_properties,
2010 :
2011 : .get_timeout = mount_get_timeout,
2012 :
2013 : .can_transient = true,
2014 :
2015 : .enumerate_perpetual = mount_enumerate_perpetual,
2016 : .enumerate = mount_enumerate,
2017 : .shutdown = mount_shutdown,
2018 :
2019 : .status_message_formats = {
2020 : .starting_stopping = {
2021 : [0] = "Mounting %s...",
2022 : [1] = "Unmounting %s...",
2023 : },
2024 : .finished_start_job = {
2025 : [JOB_DONE] = "Mounted %s.",
2026 : [JOB_FAILED] = "Failed to mount %s.",
2027 : [JOB_TIMEOUT] = "Timed out mounting %s.",
2028 : },
2029 : .finished_stop_job = {
2030 : [JOB_DONE] = "Unmounted %s.",
2031 : [JOB_FAILED] = "Failed unmounting %s.",
2032 : [JOB_TIMEOUT] = "Timed out unmounting %s.",
2033 : },
2034 : },
2035 : };
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