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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_needs_network(const char *options, const char *fstype) { | |
72 | if (fstab_test_option(options, "_netdev\0")) | |
73 | return true; | |
74 | ||
75 | if (fstype && fstype_is_network(fstype)) | |
76 | return true; | |
77 | ||
78 | return false; | |
79 | } | |
80 | ||
81 | static bool mount_is_network(const MountParameters *p) { | |
82 | assert(p); | |
83 | ||
84 | return mount_needs_network(p->options, p->fstype); | |
85 | } | |
86 | ||
87 | static bool mount_is_loop(const MountParameters *p) { | |
88 | assert(p); | |
89 | ||
90 | if (fstab_test_option(p->options, "loop\0")) | |
91 | return true; | |
92 | ||
93 | return false; | |
94 | } | |
95 | ||
96 | static bool mount_is_bind(const MountParameters *p) { | |
97 | assert(p); | |
98 | ||
99 | if (fstab_test_option(p->options, "bind\0" "rbind\0")) | |
100 | return true; | |
101 | ||
102 | if (p->fstype && STR_IN_SET(p->fstype, "bind", "rbind")) | |
103 | return true; | |
104 | ||
105 | return false; | |
106 | } | |
107 | ||
108 | static bool mount_is_auto(const MountParameters *p) { | |
109 | assert(p); | |
110 | ||
111 | return !fstab_test_option(p->options, "noauto\0"); | |
112 | } | |
113 | ||
114 | static bool mount_is_automount(const MountParameters *p) { | |
115 | assert(p); | |
116 | ||
117 | return fstab_test_option(p->options, | |
118 | "comment=systemd.automount\0" | |
119 | "x-systemd.automount\0"); | |
120 | } | |
121 | ||
122 | static bool mount_is_bound_to_device(const Mount *m) { | |
123 | const MountParameters *p; | |
124 | ||
125 | if (m->from_fragment) | |
126 | return true; | |
127 | ||
128 | p = &m->parameters_proc_self_mountinfo; | |
129 | return fstab_test_option(p->options, "x-systemd.device-bound\0"); | |
130 | } | |
131 | ||
132 | static bool needs_quota(const MountParameters *p) { | |
133 | assert(p); | |
134 | ||
135 | /* Quotas are not enabled on network filesystems, | |
136 | * but we want them, for example, on storage connected via iscsi */ | |
137 | if (p->fstype && fstype_is_network(p->fstype)) | |
138 | return false; | |
139 | ||
140 | if (mount_is_bind(p)) | |
141 | return false; | |
142 | ||
143 | return fstab_test_option(p->options, | |
144 | "usrquota\0" "grpquota\0" "quota\0" "usrjquota\0" "grpjquota\0"); | |
145 | } | |
146 | ||
147 | static void mount_init(Unit *u) { | |
148 | Mount *m = MOUNT(u); | |
149 | ||
150 | assert(u); | |
151 | assert(u->load_state == UNIT_STUB); | |
152 | ||
153 | m->timeout_usec = u->manager->default_timeout_start_usec; | |
154 | ||
155 | m->exec_context.std_output = u->manager->default_std_output; | |
156 | m->exec_context.std_error = u->manager->default_std_error; | |
157 | ||
158 | m->directory_mode = 0755; | |
159 | ||
160 | /* We need to make sure that /usr/bin/mount is always called | |
161 | * in the same process group as us, so that the autofs kernel | |
162 | * side doesn't send us another mount request while we are | |
163 | * already trying to comply its last one. */ | |
164 | m->exec_context.same_pgrp = true; | |
165 | ||
166 | m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; | |
167 | ||
168 | u->ignore_on_isolate = true; | |
169 | } | |
170 | ||
171 | static int mount_arm_timer(Mount *m, usec_t usec) { | |
172 | int r; | |
173 | ||
174 | assert(m); | |
175 | ||
176 | if (m->timer_event_source) { | |
177 | r = sd_event_source_set_time(m->timer_event_source, usec); | |
178 | if (r < 0) | |
179 | return r; | |
180 | ||
181 | return sd_event_source_set_enabled(m->timer_event_source, SD_EVENT_ONESHOT); | |
182 | } | |
183 | ||
184 | if (usec == USEC_INFINITY) | |
185 | return 0; | |
186 | ||
187 | r = sd_event_add_time( | |
188 | UNIT(m)->manager->event, | |
189 | &m->timer_event_source, | |
190 | CLOCK_MONOTONIC, | |
191 | usec, 0, | |
192 | mount_dispatch_timer, m); | |
193 | if (r < 0) | |
194 | return r; | |
195 | ||
196 | (void) sd_event_source_set_description(m->timer_event_source, "mount-timer"); | |
197 | ||
198 | return 0; | |
199 | } | |
200 | ||
201 | static void mount_unwatch_control_pid(Mount *m) { | |
202 | assert(m); | |
203 | ||
204 | if (m->control_pid <= 0) | |
205 | return; | |
206 | ||
207 | unit_unwatch_pid(UNIT(m), m->control_pid); | |
208 | m->control_pid = 0; | |
209 | } | |
210 | ||
211 | static void mount_parameters_done(MountParameters *p) { | |
212 | assert(p); | |
213 | ||
214 | free(p->what); | |
215 | free(p->options); | |
216 | free(p->fstype); | |
217 | ||
218 | p->what = p->options = p->fstype = NULL; | |
219 | } | |
220 | ||
221 | static void mount_done(Unit *u) { | |
222 | Mount *m = MOUNT(u); | |
223 | ||
224 | assert(m); | |
225 | ||
226 | m->where = mfree(m->where); | |
227 | ||
228 | mount_parameters_done(&m->parameters_proc_self_mountinfo); | |
229 | mount_parameters_done(&m->parameters_fragment); | |
230 | ||
231 | m->exec_runtime = exec_runtime_unref(m->exec_runtime, false); | |
232 | exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX); | |
233 | m->control_command = NULL; | |
234 | ||
235 | dynamic_creds_unref(&m->dynamic_creds); | |
236 | ||
237 | mount_unwatch_control_pid(m); | |
238 | ||
239 | m->timer_event_source = sd_event_source_unref(m->timer_event_source); | |
240 | } | |
241 | ||
242 | _pure_ static MountParameters* get_mount_parameters_fragment(Mount *m) { | |
243 | assert(m); | |
244 | ||
245 | if (m->from_fragment) | |
246 | return &m->parameters_fragment; | |
247 | ||
248 | return NULL; | |
249 | } | |
250 | ||
251 | _pure_ static MountParameters* get_mount_parameters(Mount *m) { | |
252 | assert(m); | |
253 | ||
254 | if (m->from_proc_self_mountinfo) | |
255 | return &m->parameters_proc_self_mountinfo; | |
256 | ||
257 | return get_mount_parameters_fragment(m); | |
258 | } | |
259 | ||
260 | static int mount_add_mount_dependencies(Mount *m) { | |
261 | MountParameters *pm; | |
262 | Unit *other; | |
263 | Iterator i; | |
264 | Set *s; | |
265 | int r; | |
266 | ||
267 | assert(m); | |
268 | ||
269 | if (!path_equal(m->where, "/")) { | |
270 | _cleanup_free_ char *parent = NULL; | |
271 | ||
272 | /* Adds in links to other mount points that might lie further up in the hierarchy */ | |
273 | ||
274 | parent = dirname_malloc(m->where); | |
275 | if (!parent) | |
276 | return -ENOMEM; | |
277 | ||
278 | r = unit_require_mounts_for(UNIT(m), parent, UNIT_DEPENDENCY_IMPLICIT); | |
279 | if (r < 0) | |
280 | return r; | |
281 | } | |
282 | ||
283 | /* Adds in dependencies to other mount points that might be needed for the source path (if this is a bind mount | |
284 | * or a loop mount) to be available. */ | |
285 | pm = get_mount_parameters_fragment(m); | |
286 | if (pm && pm->what && | |
287 | path_is_absolute(pm->what) && | |
288 | (mount_is_bind(pm) || mount_is_loop(pm) || !mount_is_network(pm))) { | |
289 | ||
290 | r = unit_require_mounts_for(UNIT(m), pm->what, UNIT_DEPENDENCY_FILE); | |
291 | if (r < 0) | |
292 | return r; | |
293 | } | |
294 | ||
295 | /* Adds in dependencies to other units that use this path or paths further down in the hierarchy */ | |
296 | s = manager_get_units_requiring_mounts_for(UNIT(m)->manager, m->where); | |
297 | SET_FOREACH(other, s, i) { | |
298 | ||
299 | if (other->load_state != UNIT_LOADED) | |
300 | continue; | |
301 | ||
302 | if (other == UNIT(m)) | |
303 | continue; | |
304 | ||
305 | r = unit_add_dependency(other, UNIT_AFTER, UNIT(m), true, UNIT_DEPENDENCY_PATH); | |
306 | if (r < 0) | |
307 | return r; | |
308 | ||
309 | if (UNIT(m)->fragment_path) { | |
310 | /* If we have fragment configuration, then make this dependency required */ | |
311 | r = unit_add_dependency(other, UNIT_REQUIRES, UNIT(m), true, UNIT_DEPENDENCY_PATH); | |
312 | if (r < 0) | |
313 | return r; | |
314 | } | |
315 | } | |
316 | ||
317 | return 0; | |
318 | } | |
319 | ||
320 | static int mount_add_device_dependencies(Mount *m) { | |
321 | bool device_wants_mount = false; | |
322 | UnitDependencyMask mask; | |
323 | MountParameters *p; | |
324 | UnitDependency dep; | |
325 | int r; | |
326 | ||
327 | assert(m); | |
328 | ||
329 | p = get_mount_parameters(m); | |
330 | if (!p) | |
331 | return 0; | |
332 | ||
333 | if (!p->what) | |
334 | return 0; | |
335 | ||
336 | if (mount_is_bind(p)) | |
337 | return 0; | |
338 | ||
339 | if (!is_device_path(p->what)) | |
340 | return 0; | |
341 | ||
342 | /* /dev/root is a really weird thing, it's not a real device, | |
343 | * but just a path the kernel exports for the root file system | |
344 | * specified on the kernel command line. Ignore it here. */ | |
345 | if (path_equal(p->what, "/dev/root")) | |
346 | return 0; | |
347 | ||
348 | if (path_equal(m->where, "/")) | |
349 | return 0; | |
350 | ||
351 | if (mount_is_auto(p) && !mount_is_automount(p) && MANAGER_IS_SYSTEM(UNIT(m)->manager)) | |
352 | device_wants_mount = true; | |
353 | ||
354 | /* Mount units from /proc/self/mountinfo are not bound to devices | |
355 | * by default since they're subject to races when devices are | |
356 | * unplugged. But the user can still force this dep with an | |
357 | * appropriate option (or udev property) so the mount units are | |
358 | * automatically stopped when the device disappears suddenly. */ | |
359 | dep = mount_is_bound_to_device(m) ? UNIT_BINDS_TO : UNIT_REQUIRES; | |
360 | ||
361 | mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT; | |
362 | ||
363 | r = unit_add_node_dependency(UNIT(m), p->what, device_wants_mount, dep, mask); | |
364 | if (r < 0) | |
365 | return r; | |
366 | ||
367 | return 0; | |
368 | } | |
369 | ||
370 | static int mount_add_quota_dependencies(Mount *m) { | |
371 | UnitDependencyMask mask; | |
372 | MountParameters *p; | |
373 | int r; | |
374 | ||
375 | assert(m); | |
376 | ||
377 | if (!MANAGER_IS_SYSTEM(UNIT(m)->manager)) | |
378 | return 0; | |
379 | ||
380 | p = get_mount_parameters_fragment(m); | |
381 | if (!p) | |
382 | return 0; | |
383 | ||
384 | if (!needs_quota(p)) | |
385 | return 0; | |
386 | ||
387 | mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT; | |
388 | ||
389 | r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, true, mask); | |
390 | if (r < 0) | |
391 | return r; | |
392 | ||
393 | r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, true, mask); | |
394 | if (r < 0) | |
395 | return r; | |
396 | ||
397 | return 0; | |
398 | } | |
399 | ||
400 | static bool mount_is_extrinsic(Mount *m) { | |
401 | MountParameters *p; | |
402 | assert(m); | |
403 | ||
404 | /* Returns true for all units that are "magic" and should be excluded from the usual start-up and shutdown | |
405 | * dependencies. We call them "extrinsic" here, as they are generally mounted outside of the systemd dependency | |
406 | * logic. We shouldn't attempt to manage them ourselves but it's fine if the user operates on them with us. */ | |
407 | ||
408 | if (!MANAGER_IS_SYSTEM(UNIT(m)->manager)) /* We only automatically manage mounts if we are in system mode */ | |
409 | return true; | |
410 | ||
411 | if (PATH_IN_SET(m->where, /* Don't bother with the OS data itself */ | |
412 | "/", | |
413 | "/usr")) | |
414 | return true; | |
415 | ||
416 | if (PATH_STARTSWITH_SET(m->where, | |
417 | "/run/initramfs", /* This should stay around from before we boot until after we shutdown */ | |
418 | "/proc", /* All of this is API VFS */ | |
419 | "/sys", /* … dito … */ | |
420 | "/dev")) /* … dito … */ | |
421 | return true; | |
422 | ||
423 | /* If this is an initrd mount, and we are not in the initrd, then leave this around forever, too. */ | |
424 | p = get_mount_parameters(m); | |
425 | if (p && fstab_test_option(p->options, "x-initrd.mount\0") && !in_initrd()) | |
426 | return true; | |
427 | ||
428 | return false; | |
429 | } | |
430 | ||
431 | static int mount_add_default_dependencies(Mount *m) { | |
432 | UnitDependencyMask mask; | |
433 | int r; | |
434 | MountParameters *p; | |
435 | const char *after; | |
436 | ||
437 | assert(m); | |
438 | ||
439 | if (!UNIT(m)->default_dependencies) | |
440 | 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 | if (mount_is_extrinsic(m)) | |
446 | return 0; | |
447 | ||
448 | p = get_mount_parameters(m); | |
449 | if (!p) | |
450 | return 0; | |
451 | ||
452 | mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_DEFAULT; | |
453 | ||
454 | if (mount_is_network(p)) { | |
455 | /* We order ourselves after network.target. This is | |
456 | * primarily useful at shutdown: services that take | |
457 | * down the network should order themselves before | |
458 | * network.target, so that they are shut down only | |
459 | * after this mount unit is stopped. */ | |
460 | ||
461 | r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_NETWORK_TARGET, true, mask); | |
462 | if (r < 0) | |
463 | return r; | |
464 | ||
465 | /* We pull in network-online.target, and order | |
466 | * ourselves after it. This is useful at start-up to | |
467 | * actively pull in tools that want to be started | |
468 | * before we start mounting network file systems, and | |
469 | * whose purpose it is to delay this until the network | |
470 | * is "up". */ | |
471 | ||
472 | r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_WANTS, UNIT_AFTER, SPECIAL_NETWORK_ONLINE_TARGET, true, mask); | |
473 | if (r < 0) | |
474 | return r; | |
475 | ||
476 | after = SPECIAL_REMOTE_FS_PRE_TARGET; | |
477 | } else | |
478 | after = SPECIAL_LOCAL_FS_PRE_TARGET; | |
479 | ||
480 | r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, true, mask); | |
481 | if (r < 0) | |
482 | return r; | |
483 | ||
484 | r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, true, mask); | |
485 | if (r < 0) | |
486 | return r; | |
487 | ||
488 | /* If this is a tmpfs mount then we have to unmount it before we try to deactivate swaps */ | |
489 | if (streq_ptr(p->fstype, "tmpfs")) { | |
490 | r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_SWAP_TARGET, true, mask); | |
491 | if (r < 0) | |
492 | return r; | |
493 | } | |
494 | ||
495 | return 0; | |
496 | } | |
497 | ||
498 | static int mount_verify(Mount *m) { | |
499 | _cleanup_free_ char *e = NULL; | |
500 | MountParameters *p; | |
501 | int r; | |
502 | ||
503 | assert(m); | |
504 | ||
505 | if (UNIT(m)->load_state != UNIT_LOADED) | |
506 | return 0; | |
507 | ||
508 | if (!m->from_fragment && !m->from_proc_self_mountinfo && !UNIT(m)->perpetual) | |
509 | return -ENOENT; | |
510 | ||
511 | r = unit_name_from_path(m->where, ".mount", &e); | |
512 | if (r < 0) | |
513 | return log_unit_error_errno(UNIT(m), r, "Failed to generate unit name from mount path: %m"); | |
514 | ||
515 | if (!unit_has_name(UNIT(m), e)) { | |
516 | log_unit_error(UNIT(m), "Where= setting doesn't match unit name. Refusing."); | |
517 | return -ENOEXEC; | |
518 | } | |
519 | ||
520 | if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) { | |
521 | log_unit_error(UNIT(m), "Cannot create mount unit for API file system %s. Refusing.", m->where); | |
522 | return -ENOEXEC; | |
523 | } | |
524 | ||
525 | p = get_mount_parameters_fragment(m); | |
526 | if (p && !p->what) { | |
527 | log_unit_error(UNIT(m), "What= setting is missing. Refusing."); | |
528 | return -ENOEXEC; | |
529 | } | |
530 | ||
531 | if (m->exec_context.pam_name && m->kill_context.kill_mode != KILL_CONTROL_GROUP) { | |
532 | log_unit_error(UNIT(m), "Unit has PAM enabled. Kill mode must be set to control-group'. Refusing."); | |
533 | return -ENOEXEC; | |
534 | } | |
535 | ||
536 | return 0; | |
537 | } | |
538 | ||
539 | static int mount_add_extras(Mount *m) { | |
540 | Unit *u = UNIT(m); | |
541 | int r; | |
542 | ||
543 | assert(m); | |
544 | ||
545 | if (u->fragment_path) | |
546 | m->from_fragment = true; | |
547 | ||
548 | if (!m->where) { | |
549 | r = unit_name_to_path(u->id, &m->where); | |
550 | if (r < 0) | |
551 | return r; | |
552 | } | |
553 | ||
554 | path_simplify(m->where, false); | |
555 | ||
556 | if (!u->description) { | |
557 | r = unit_set_description(u, m->where); | |
558 | if (r < 0) | |
559 | return r; | |
560 | } | |
561 | ||
562 | r = mount_add_device_dependencies(m); | |
563 | if (r < 0) | |
564 | return r; | |
565 | ||
566 | r = mount_add_mount_dependencies(m); | |
567 | if (r < 0) | |
568 | return r; | |
569 | ||
570 | r = mount_add_quota_dependencies(m); | |
571 | if (r < 0) | |
572 | return r; | |
573 | ||
574 | r = unit_patch_contexts(u); | |
575 | if (r < 0) | |
576 | return r; | |
577 | ||
578 | r = unit_add_exec_dependencies(u, &m->exec_context); | |
579 | if (r < 0) | |
580 | return r; | |
581 | ||
582 | r = unit_set_default_slice(u); | |
583 | if (r < 0) | |
584 | return r; | |
585 | ||
586 | r = mount_add_default_dependencies(m); | |
587 | if (r < 0) | |
588 | return r; | |
589 | ||
590 | return 0; | |
591 | } | |
592 | ||
593 | static int mount_load_root_mount(Unit *u) { | |
594 | assert(u); | |
595 | ||
596 | if (!unit_has_name(u, SPECIAL_ROOT_MOUNT)) | |
597 | return 0; | |
598 | ||
599 | u->perpetual = true; | |
600 | u->default_dependencies = false; | |
601 | ||
602 | /* The stdio/kmsg bridge socket is on /, in order to avoid a dep loop, don't use kmsg logging for -.mount */ | |
603 | MOUNT(u)->exec_context.std_output = EXEC_OUTPUT_NULL; | |
604 | MOUNT(u)->exec_context.std_input = EXEC_INPUT_NULL; | |
605 | ||
606 | if (!u->description) | |
607 | u->description = strdup("Root Mount"); | |
608 | ||
609 | return 1; | |
610 | } | |
611 | ||
612 | static int mount_load(Unit *u) { | |
613 | Mount *m = MOUNT(u); | |
614 | int r; | |
615 | ||
616 | assert(u); | |
617 | assert(u->load_state == UNIT_STUB); | |
618 | ||
619 | r = mount_load_root_mount(u); | |
620 | if (r < 0) | |
621 | return r; | |
622 | ||
623 | if (m->from_proc_self_mountinfo || u->perpetual) | |
624 | r = unit_load_fragment_and_dropin_optional(u); | |
625 | else | |
626 | r = unit_load_fragment_and_dropin(u); | |
627 | if (r < 0) | |
628 | return r; | |
629 | ||
630 | /* This is a new unit? Then let's add in some extras */ | |
631 | if (u->load_state == UNIT_LOADED) { | |
632 | r = mount_add_extras(m); | |
633 | if (r < 0) | |
634 | return r; | |
635 | } | |
636 | ||
637 | return mount_verify(m); | |
638 | } | |
639 | ||
640 | static void mount_set_state(Mount *m, MountState state) { | |
641 | MountState old_state; | |
642 | assert(m); | |
643 | ||
644 | if (m->state != state) | |
645 | bus_unit_send_pending_change_signal(UNIT(m), false); | |
646 | ||
647 | old_state = m->state; | |
648 | m->state = state; | |
649 | ||
650 | if (!MOUNT_STATE_WITH_PROCESS(state)) { | |
651 | m->timer_event_source = sd_event_source_unref(m->timer_event_source); | |
652 | mount_unwatch_control_pid(m); | |
653 | m->control_command = NULL; | |
654 | m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; | |
655 | } | |
656 | ||
657 | if (state != old_state) | |
658 | log_unit_debug(UNIT(m), "Changed %s -> %s", mount_state_to_string(old_state), mount_state_to_string(state)); | |
659 | ||
660 | unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state], | |
661 | m->reload_result == MOUNT_SUCCESS ? 0 : UNIT_NOTIFY_RELOAD_FAILURE); | |
662 | } | |
663 | ||
664 | static int mount_coldplug(Unit *u) { | |
665 | Mount *m = MOUNT(u); | |
666 | MountState new_state = MOUNT_DEAD; | |
667 | int r; | |
668 | ||
669 | assert(m); | |
670 | assert(m->state == MOUNT_DEAD); | |
671 | ||
672 | if (m->deserialized_state != m->state) | |
673 | new_state = m->deserialized_state; | |
674 | else if (m->from_proc_self_mountinfo) | |
675 | new_state = MOUNT_MOUNTED; | |
676 | ||
677 | if (new_state == m->state) | |
678 | return 0; | |
679 | ||
680 | if (m->control_pid > 0 && | |
681 | pid_is_unwaited(m->control_pid) && | |
682 | MOUNT_STATE_WITH_PROCESS(new_state)) { | |
683 | ||
684 | r = unit_watch_pid(UNIT(m), m->control_pid); | |
685 | if (r < 0) | |
686 | return r; | |
687 | ||
688 | r = mount_arm_timer(m, usec_add(u->state_change_timestamp.monotonic, m->timeout_usec)); | |
689 | if (r < 0) | |
690 | return r; | |
691 | } | |
692 | ||
693 | if (!IN_SET(new_state, MOUNT_DEAD, MOUNT_FAILED)) { | |
694 | (void) unit_setup_dynamic_creds(u); | |
695 | (void) unit_setup_exec_runtime(u); | |
696 | } | |
697 | ||
698 | mount_set_state(m, new_state); | |
699 | return 0; | |
700 | } | |
701 | ||
702 | static void mount_dump(Unit *u, FILE *f, const char *prefix) { | |
703 | char buf[FORMAT_TIMESPAN_MAX]; | |
704 | Mount *m = MOUNT(u); | |
705 | MountParameters *p; | |
706 | ||
707 | assert(m); | |
708 | assert(f); | |
709 | ||
710 | p = get_mount_parameters(m); | |
711 | ||
712 | fprintf(f, | |
713 | "%sMount State: %s\n" | |
714 | "%sResult: %s\n" | |
715 | "%sWhere: %s\n" | |
716 | "%sWhat: %s\n" | |
717 | "%sFile System Type: %s\n" | |
718 | "%sOptions: %s\n" | |
719 | "%sFrom /proc/self/mountinfo: %s\n" | |
720 | "%sFrom fragment: %s\n" | |
721 | "%sExtrinsic: %s\n" | |
722 | "%sDirectoryMode: %04o\n" | |
723 | "%sSloppyOptions: %s\n" | |
724 | "%sLazyUnmount: %s\n" | |
725 | "%sForceUnmount: %s\n" | |
726 | "%sTimoutSec: %s\n", | |
727 | prefix, mount_state_to_string(m->state), | |
728 | prefix, mount_result_to_string(m->result), | |
729 | prefix, m->where, | |
730 | prefix, p ? strna(p->what) : "n/a", | |
731 | prefix, p ? strna(p->fstype) : "n/a", | |
732 | prefix, p ? strna(p->options) : "n/a", | |
733 | prefix, yes_no(m->from_proc_self_mountinfo), | |
734 | prefix, yes_no(m->from_fragment), | |
735 | prefix, yes_no(mount_is_extrinsic(m)), | |
736 | prefix, m->directory_mode, | |
737 | prefix, yes_no(m->sloppy_options), | |
738 | prefix, yes_no(m->lazy_unmount), | |
739 | prefix, yes_no(m->force_unmount), | |
740 | prefix, format_timespan(buf, sizeof(buf), m->timeout_usec, USEC_PER_SEC)); | |
741 | ||
742 | if (m->control_pid > 0) | |
743 | fprintf(f, | |
744 | "%sControl PID: "PID_FMT"\n", | |
745 | prefix, m->control_pid); | |
746 | ||
747 | exec_context_dump(&m->exec_context, f, prefix); | |
748 | kill_context_dump(&m->kill_context, f, prefix); | |
749 | cgroup_context_dump(&m->cgroup_context, f, prefix); | |
750 | } | |
751 | ||
752 | static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) { | |
753 | ||
754 | _cleanup_(exec_params_clear) ExecParameters exec_params = { | |
755 | .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN, | |
756 | .stdin_fd = -1, | |
757 | .stdout_fd = -1, | |
758 | .stderr_fd = -1, | |
759 | .exec_fd = -1, | |
760 | }; | |
761 | pid_t pid; | |
762 | int r; | |
763 | ||
764 | assert(m); | |
765 | assert(c); | |
766 | assert(_pid); | |
767 | ||
768 | r = unit_prepare_exec(UNIT(m)); | |
769 | if (r < 0) | |
770 | return r; | |
771 | ||
772 | r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec)); | |
773 | if (r < 0) | |
774 | return r; | |
775 | ||
776 | r = unit_set_exec_params(UNIT(m), &exec_params); | |
777 | if (r < 0) | |
778 | return r; | |
779 | ||
780 | r = exec_spawn(UNIT(m), | |
781 | c, | |
782 | &m->exec_context, | |
783 | &exec_params, | |
784 | m->exec_runtime, | |
785 | &m->dynamic_creds, | |
786 | &pid); | |
787 | if (r < 0) | |
788 | return r; | |
789 | ||
790 | r = unit_watch_pid(UNIT(m), pid); | |
791 | if (r < 0) | |
792 | /* FIXME: we need to do something here */ | |
793 | return r; | |
794 | ||
795 | *_pid = pid; | |
796 | ||
797 | return 0; | |
798 | } | |
799 | ||
800 | static void mount_enter_dead(Mount *m, MountResult f) { | |
801 | assert(m); | |
802 | ||
803 | if (m->result == MOUNT_SUCCESS) | |
804 | m->result = f; | |
805 | ||
806 | unit_log_result(UNIT(m), m->result == MOUNT_SUCCESS, mount_result_to_string(m->result)); | |
807 | mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD); | |
808 | ||
809 | m->exec_runtime = exec_runtime_unref(m->exec_runtime, true); | |
810 | ||
811 | exec_context_destroy_runtime_directory(&m->exec_context, UNIT(m)->manager->prefix[EXEC_DIRECTORY_RUNTIME]); | |
812 | ||
813 | unit_unref_uid_gid(UNIT(m), true); | |
814 | ||
815 | dynamic_creds_destroy(&m->dynamic_creds); | |
816 | } | |
817 | ||
818 | static void mount_enter_mounted(Mount *m, MountResult f) { | |
819 | assert(m); | |
820 | ||
821 | if (m->result == MOUNT_SUCCESS) | |
822 | m->result = f; | |
823 | ||
824 | mount_set_state(m, MOUNT_MOUNTED); | |
825 | } | |
826 | ||
827 | static void mount_enter_dead_or_mounted(Mount *m, MountResult f) { | |
828 | assert(m); | |
829 | ||
830 | /* Enter DEAD or MOUNTED state, depending on what the kernel currently says about the mount point. We use this | |
831 | * whenever we executed an operation, so that our internal state reflects what the kernel says again, after all | |
832 | * ultimately we just mirror the kernel's internal state on this. */ | |
833 | ||
834 | if (m->from_proc_self_mountinfo) | |
835 | mount_enter_mounted(m, f); | |
836 | else | |
837 | mount_enter_dead(m, f); | |
838 | } | |
839 | ||
840 | static int state_to_kill_operation(MountState state) { | |
841 | switch (state) { | |
842 | ||
843 | case MOUNT_REMOUNTING_SIGTERM: | |
844 | case MOUNT_UNMOUNTING_SIGTERM: | |
845 | return KILL_TERMINATE; | |
846 | ||
847 | case MOUNT_REMOUNTING_SIGKILL: | |
848 | case MOUNT_UNMOUNTING_SIGKILL: | |
849 | return KILL_KILL; | |
850 | ||
851 | default: | |
852 | return _KILL_OPERATION_INVALID; | |
853 | } | |
854 | } | |
855 | ||
856 | static void mount_enter_signal(Mount *m, MountState state, MountResult f) { | |
857 | int r; | |
858 | ||
859 | assert(m); | |
860 | ||
861 | if (m->result == MOUNT_SUCCESS) | |
862 | m->result = f; | |
863 | ||
864 | r = unit_kill_context( | |
865 | UNIT(m), | |
866 | &m->kill_context, | |
867 | state_to_kill_operation(state), | |
868 | -1, | |
869 | m->control_pid, | |
870 | false); | |
871 | if (r < 0) | |
872 | goto fail; | |
873 | ||
874 | if (r > 0) { | |
875 | r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec)); | |
876 | if (r < 0) | |
877 | goto fail; | |
878 | ||
879 | mount_set_state(m, state); | |
880 | } else if (state == MOUNT_REMOUNTING_SIGTERM && m->kill_context.send_sigkill) | |
881 | mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS); | |
882 | else if (IN_SET(state, MOUNT_REMOUNTING_SIGTERM, MOUNT_REMOUNTING_SIGKILL)) | |
883 | mount_enter_mounted(m, MOUNT_SUCCESS); | |
884 | else if (state == MOUNT_UNMOUNTING_SIGTERM && m->kill_context.send_sigkill) | |
885 | mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS); | |
886 | else | |
887 | mount_enter_dead_or_mounted(m, MOUNT_SUCCESS); | |
888 | ||
889 | return; | |
890 | ||
891 | fail: | |
892 | log_unit_warning_errno(UNIT(m), r, "Failed to kill processes: %m"); | |
893 | mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES); | |
894 | } | |
895 | ||
896 | static void mount_enter_unmounting(Mount *m) { | |
897 | int r; | |
898 | ||
899 | assert(m); | |
900 | ||
901 | /* Start counting our attempts */ | |
902 | if (!IN_SET(m->state, | |
903 | MOUNT_UNMOUNTING, | |
904 | MOUNT_UNMOUNTING_SIGTERM, | |
905 | MOUNT_UNMOUNTING_SIGKILL)) | |
906 | m->n_retry_umount = 0; | |
907 | ||
908 | m->control_command_id = MOUNT_EXEC_UNMOUNT; | |
909 | m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT; | |
910 | ||
911 | r = exec_command_set(m->control_command, UMOUNT_PATH, m->where, "-c", NULL); | |
912 | if (r >= 0 && m->lazy_unmount) | |
913 | r = exec_command_append(m->control_command, "-l", NULL); | |
914 | if (r >= 0 && m->force_unmount) | |
915 | r = exec_command_append(m->control_command, "-f", NULL); | |
916 | if (r < 0) | |
917 | goto fail; | |
918 | ||
919 | mount_unwatch_control_pid(m); | |
920 | ||
921 | r = mount_spawn(m, m->control_command, &m->control_pid); | |
922 | if (r < 0) | |
923 | goto fail; | |
924 | ||
925 | mount_set_state(m, MOUNT_UNMOUNTING); | |
926 | ||
927 | return; | |
928 | ||
929 | fail: | |
930 | log_unit_warning_errno(UNIT(m), r, "Failed to run 'umount' task: %m"); | |
931 | mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES); | |
932 | } | |
933 | ||
934 | static void mount_enter_mounting(Mount *m) { | |
935 | int r; | |
936 | MountParameters *p; | |
937 | ||
938 | assert(m); | |
939 | ||
940 | r = unit_fail_if_noncanonical(UNIT(m), m->where); | |
941 | if (r < 0) | |
942 | goto fail; | |
943 | ||
944 | (void) mkdir_p_label(m->where, m->directory_mode); | |
945 | ||
946 | unit_warn_if_dir_nonempty(UNIT(m), m->where); | |
947 | ||
948 | unit_warn_leftover_processes(UNIT(m)); | |
949 | ||
950 | m->control_command_id = MOUNT_EXEC_MOUNT; | |
951 | m->control_command = m->exec_command + MOUNT_EXEC_MOUNT; | |
952 | ||
953 | /* Create the source directory for bind-mounts if needed */ | |
954 | p = get_mount_parameters_fragment(m); | |
955 | if (p && mount_is_bind(p)) | |
956 | (void) mkdir_p_label(p->what, m->directory_mode); | |
957 | ||
958 | if (p) { | |
959 | _cleanup_free_ char *opts = NULL; | |
960 | ||
961 | r = fstab_filter_options(p->options, "nofail\0" "noauto\0" "auto\0", NULL, NULL, &opts); | |
962 | if (r < 0) | |
963 | goto fail; | |
964 | ||
965 | r = exec_command_set(m->control_command, MOUNT_PATH, p->what, m->where, NULL); | |
966 | if (r >= 0 && m->sloppy_options) | |
967 | r = exec_command_append(m->control_command, "-s", NULL); | |
968 | if (r >= 0 && p->fstype) | |
969 | r = exec_command_append(m->control_command, "-t", p->fstype, NULL); | |
970 | if (r >= 0 && !isempty(opts)) | |
971 | r = exec_command_append(m->control_command, "-o", opts, NULL); | |
972 | } else | |
973 | r = -ENOENT; | |
974 | if (r < 0) | |
975 | goto fail; | |
976 | ||
977 | mount_unwatch_control_pid(m); | |
978 | ||
979 | r = mount_spawn(m, m->control_command, &m->control_pid); | |
980 | if (r < 0) | |
981 | goto fail; | |
982 | ||
983 | mount_set_state(m, MOUNT_MOUNTING); | |
984 | ||
985 | return; | |
986 | ||
987 | fail: | |
988 | log_unit_warning_errno(UNIT(m), r, "Failed to run 'mount' task: %m"); | |
989 | mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES); | |
990 | } | |
991 | ||
992 | static void mount_set_reload_result(Mount *m, MountResult result) { | |
993 | assert(m); | |
994 | ||
995 | /* Only store the first error we encounter */ | |
996 | if (m->reload_result != MOUNT_SUCCESS) | |
997 | return; | |
998 | ||
999 | m->reload_result = result; | |
1000 | } | |
1001 | ||
1002 | static void mount_enter_remounting(Mount *m) { | |
1003 | int r; | |
1004 | MountParameters *p; | |
1005 | ||
1006 | assert(m); | |
1007 | ||
1008 | /* Reset reload result when we are about to start a new remount operation */ | |
1009 | m->reload_result = MOUNT_SUCCESS; | |
1010 | ||
1011 | m->control_command_id = MOUNT_EXEC_REMOUNT; | |
1012 | m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT; | |
1013 | ||
1014 | p = get_mount_parameters_fragment(m); | |
1015 | if (p) { | |
1016 | const char *o; | |
1017 | ||
1018 | if (p->options) | |
1019 | o = strjoina("remount,", p->options); | |
1020 | else | |
1021 | o = "remount"; | |
1022 | ||
1023 | r = exec_command_set(m->control_command, MOUNT_PATH, | |
1024 | p->what, m->where, | |
1025 | "-o", o, NULL); | |
1026 | if (r >= 0 && m->sloppy_options) | |
1027 | r = exec_command_append(m->control_command, "-s", NULL); | |
1028 | if (r >= 0 && p->fstype) | |
1029 | r = exec_command_append(m->control_command, "-t", p->fstype, NULL); | |
1030 | } else | |
1031 | r = -ENOENT; | |
1032 | if (r < 0) | |
1033 | goto fail; | |
1034 | ||
1035 | mount_unwatch_control_pid(m); | |
1036 | ||
1037 | r = mount_spawn(m, m->control_command, &m->control_pid); | |
1038 | if (r < 0) | |
1039 | goto fail; | |
1040 | ||
1041 | mount_set_state(m, MOUNT_REMOUNTING); | |
1042 | ||
1043 | return; | |
1044 | ||
1045 | fail: | |
1046 | log_unit_warning_errno(UNIT(m), r, "Failed to run 'remount' task: %m"); | |
1047 | mount_set_reload_result(m, MOUNT_FAILURE_RESOURCES); | |
1048 | mount_enter_dead_or_mounted(m, MOUNT_SUCCESS); | |
1049 | } | |
1050 | ||
1051 | static int mount_start(Unit *u) { | |
1052 | Mount *m = MOUNT(u); | |
1053 | int r; | |
1054 | ||
1055 | assert(m); | |
1056 | ||
1057 | /* We cannot fulfill this request right now, try again later | |
1058 | * please! */ | |
1059 | if (IN_SET(m->state, | |
1060 | MOUNT_UNMOUNTING, | |
1061 | MOUNT_UNMOUNTING_SIGTERM, | |
1062 | MOUNT_UNMOUNTING_SIGKILL)) | |
1063 | return -EAGAIN; | |
1064 | ||
1065 | /* Already on it! */ | |
1066 | if (m->state == MOUNT_MOUNTING) | |
1067 | return 0; | |
1068 | ||
1069 | assert(IN_SET(m->state, MOUNT_DEAD, MOUNT_FAILED)); | |
1070 | ||
1071 | r = unit_start_limit_test(u); | |
1072 | if (r < 0) { | |
1073 | mount_enter_dead(m, MOUNT_FAILURE_START_LIMIT_HIT); | |
1074 | return r; | |
1075 | } | |
1076 | ||
1077 | r = unit_acquire_invocation_id(u); | |
1078 | if (r < 0) | |
1079 | return r; | |
1080 | ||
1081 | m->result = MOUNT_SUCCESS; | |
1082 | m->reload_result = MOUNT_SUCCESS; | |
1083 | exec_command_reset_status_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX); | |
1084 | ||
1085 | u->reset_accounting = true; | |
1086 | ||
1087 | mount_enter_mounting(m); | |
1088 | return 1; | |
1089 | } | |
1090 | ||
1091 | static int mount_stop(Unit *u) { | |
1092 | Mount *m = MOUNT(u); | |
1093 | ||
1094 | assert(m); | |
1095 | ||
1096 | switch (m->state) { | |
1097 | ||
1098 | case MOUNT_UNMOUNTING: | |
1099 | case MOUNT_UNMOUNTING_SIGKILL: | |
1100 | case MOUNT_UNMOUNTING_SIGTERM: | |
1101 | /* Already on it */ | |
1102 | return 0; | |
1103 | ||
1104 | case MOUNT_MOUNTING: | |
1105 | case MOUNT_MOUNTING_DONE: | |
1106 | case MOUNT_REMOUNTING: | |
1107 | /* If we are still waiting for /bin/mount, we go directly into kill mode. */ | |
1108 | mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_SUCCESS); | |
1109 | return 0; | |
1110 | ||
1111 | case MOUNT_REMOUNTING_SIGTERM: | |
1112 | /* If we are already waiting for a hung remount, convert this to the matching unmounting state */ | |
1113 | mount_set_state(m, MOUNT_UNMOUNTING_SIGTERM); | |
1114 | return 0; | |
1115 | ||
1116 | case MOUNT_REMOUNTING_SIGKILL: | |
1117 | /* as above */ | |
1118 | mount_set_state(m, MOUNT_UNMOUNTING_SIGKILL); | |
1119 | return 0; | |
1120 | ||
1121 | case MOUNT_MOUNTED: | |
1122 | mount_enter_unmounting(m); | |
1123 | return 1; | |
1124 | ||
1125 | default: | |
1126 | assert_not_reached("Unexpected state."); | |
1127 | } | |
1128 | } | |
1129 | ||
1130 | static int mount_reload(Unit *u) { | |
1131 | Mount *m = MOUNT(u); | |
1132 | ||
1133 | assert(m); | |
1134 | assert(m->state == MOUNT_MOUNTED); | |
1135 | ||
1136 | mount_enter_remounting(m); | |
1137 | ||
1138 | return 1; | |
1139 | } | |
1140 | ||
1141 | static int mount_serialize(Unit *u, FILE *f, FDSet *fds) { | |
1142 | Mount *m = MOUNT(u); | |
1143 | ||
1144 | assert(m); | |
1145 | assert(f); | |
1146 | assert(fds); | |
1147 | ||
1148 | (void) serialize_item(f, "state", mount_state_to_string(m->state)); | |
1149 | (void) serialize_item(f, "result", mount_result_to_string(m->result)); | |
1150 | (void) serialize_item(f, "reload-result", mount_result_to_string(m->reload_result)); | |
1151 | ||
1152 | if (m->control_pid > 0) | |
1153 | (void) serialize_item_format(f, "control-pid", PID_FMT, m->control_pid); | |
1154 | ||
1155 | if (m->control_command_id >= 0) | |
1156 | (void) serialize_item(f, "control-command", mount_exec_command_to_string(m->control_command_id)); | |
1157 | ||
1158 | return 0; | |
1159 | } | |
1160 | ||
1161 | static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
1162 | Mount *m = MOUNT(u); | |
1163 | ||
1164 | assert(u); | |
1165 | assert(key); | |
1166 | assert(value); | |
1167 | assert(fds); | |
1168 | ||
1169 | if (streq(key, "state")) { | |
1170 | MountState state; | |
1171 | ||
1172 | if ((state = mount_state_from_string(value)) < 0) | |
1173 | log_unit_debug(u, "Failed to parse state value: %s", value); | |
1174 | else | |
1175 | m->deserialized_state = state; | |
1176 | } else if (streq(key, "result")) { | |
1177 | MountResult f; | |
1178 | ||
1179 | f = mount_result_from_string(value); | |
1180 | if (f < 0) | |
1181 | log_unit_debug(u, "Failed to parse result value: %s", value); | |
1182 | else if (f != MOUNT_SUCCESS) | |
1183 | m->result = f; | |
1184 | ||
1185 | } else if (streq(key, "reload-result")) { | |
1186 | MountResult f; | |
1187 | ||
1188 | f = mount_result_from_string(value); | |
1189 | if (f < 0) | |
1190 | log_unit_debug(u, "Failed to parse reload result value: %s", value); | |
1191 | else if (f != MOUNT_SUCCESS) | |
1192 | m->reload_result = f; | |
1193 | ||
1194 | } else if (streq(key, "control-pid")) { | |
1195 | pid_t pid; | |
1196 | ||
1197 | if (parse_pid(value, &pid) < 0) | |
1198 | log_unit_debug(u, "Failed to parse control-pid value: %s", value); | |
1199 | else | |
1200 | m->control_pid = pid; | |
1201 | } else if (streq(key, "control-command")) { | |
1202 | MountExecCommand id; | |
1203 | ||
1204 | id = mount_exec_command_from_string(value); | |
1205 | if (id < 0) | |
1206 | log_unit_debug(u, "Failed to parse exec-command value: %s", value); | |
1207 | else { | |
1208 | m->control_command_id = id; | |
1209 | m->control_command = m->exec_command + id; | |
1210 | } | |
1211 | } else | |
1212 | log_unit_debug(u, "Unknown serialization key: %s", key); | |
1213 | ||
1214 | return 0; | |
1215 | } | |
1216 | ||
1217 | _pure_ static UnitActiveState mount_active_state(Unit *u) { | |
1218 | assert(u); | |
1219 | ||
1220 | return state_translation_table[MOUNT(u)->state]; | |
1221 | } | |
1222 | ||
1223 | _pure_ static const char *mount_sub_state_to_string(Unit *u) { | |
1224 | assert(u); | |
1225 | ||
1226 | return mount_state_to_string(MOUNT(u)->state); | |
1227 | } | |
1228 | ||
1229 | _pure_ static bool mount_may_gc(Unit *u) { | |
1230 | Mount *m = MOUNT(u); | |
1231 | ||
1232 | assert(m); | |
1233 | ||
1234 | if (m->from_proc_self_mountinfo) | |
1235 | return false; | |
1236 | ||
1237 | return true; | |
1238 | } | |
1239 | ||
1240 | static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) { | |
1241 | Mount *m = MOUNT(u); | |
1242 | MountResult f; | |
1243 | ||
1244 | assert(m); | |
1245 | assert(pid >= 0); | |
1246 | ||
1247 | if (pid != m->control_pid) | |
1248 | return; | |
1249 | ||
1250 | m->control_pid = 0; | |
1251 | ||
1252 | if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL)) | |
1253 | f = MOUNT_SUCCESS; | |
1254 | else if (code == CLD_EXITED) | |
1255 | f = MOUNT_FAILURE_EXIT_CODE; | |
1256 | else if (code == CLD_KILLED) | |
1257 | f = MOUNT_FAILURE_SIGNAL; | |
1258 | else if (code == CLD_DUMPED) | |
1259 | f = MOUNT_FAILURE_CORE_DUMP; | |
1260 | else | |
1261 | assert_not_reached("Unknown code"); | |
1262 | ||
1263 | if (IN_SET(m->state, MOUNT_REMOUNTING, MOUNT_REMOUNTING_SIGKILL, MOUNT_REMOUNTING_SIGTERM)) | |
1264 | mount_set_reload_result(m, f); | |
1265 | else if (m->result == MOUNT_SUCCESS) | |
1266 | m->result = f; | |
1267 | ||
1268 | if (m->control_command) { | |
1269 | exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status); | |
1270 | ||
1271 | m->control_command = NULL; | |
1272 | m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; | |
1273 | } | |
1274 | ||
1275 | unit_log_process_exit( | |
1276 | u, f == MOUNT_SUCCESS ? LOG_DEBUG : LOG_NOTICE, | |
1277 | "Mount process", | |
1278 | mount_exec_command_to_string(m->control_command_id), | |
1279 | code, status); | |
1280 | ||
1281 | /* Note that due to the io event priority logic, we can be sure the new mountinfo is loaded | |
1282 | * before we process the SIGCHLD for the mount command. */ | |
1283 | ||
1284 | switch (m->state) { | |
1285 | ||
1286 | case MOUNT_MOUNTING: | |
1287 | /* Our mount point has not appeared in mountinfo. Something went wrong. */ | |
1288 | ||
1289 | if (f == MOUNT_SUCCESS) { | |
1290 | /* Either /bin/mount has an unexpected definition of success, | |
1291 | * or someone raced us and we lost. */ | |
1292 | log_unit_warning(UNIT(m), "Mount process finished, but there is no mount."); | |
1293 | f = MOUNT_FAILURE_PROTOCOL; | |
1294 | } | |
1295 | mount_enter_dead(m, f); | |
1296 | break; | |
1297 | ||
1298 | case MOUNT_MOUNTING_DONE: | |
1299 | mount_enter_mounted(m, f); | |
1300 | break; | |
1301 | ||
1302 | case MOUNT_REMOUNTING: | |
1303 | case MOUNT_REMOUNTING_SIGTERM: | |
1304 | case MOUNT_REMOUNTING_SIGKILL: | |
1305 | mount_enter_dead_or_mounted(m, MOUNT_SUCCESS); | |
1306 | break; | |
1307 | ||
1308 | case MOUNT_UNMOUNTING: | |
1309 | ||
1310 | if (f == MOUNT_SUCCESS && m->from_proc_self_mountinfo) { | |
1311 | ||
1312 | /* Still a mount point? If so, let's try again. Most likely there were multiple mount points | |
1313 | * stacked on top of each other. We might exceed the timeout specified by the user overall, | |
1314 | * but we will stop as soon as any one umount times out. */ | |
1315 | ||
1316 | if (m->n_retry_umount < RETRY_UMOUNT_MAX) { | |
1317 | log_unit_debug(u, "Mount still present, trying again."); | |
1318 | m->n_retry_umount++; | |
1319 | mount_enter_unmounting(m); | |
1320 | } else { | |
1321 | log_unit_warning(u, "Mount still present after %u attempts to unmount, giving up.", m->n_retry_umount); | |
1322 | mount_enter_mounted(m, f); | |
1323 | } | |
1324 | } else | |
1325 | mount_enter_dead_or_mounted(m, f); | |
1326 | ||
1327 | break; | |
1328 | ||
1329 | case MOUNT_UNMOUNTING_SIGKILL: | |
1330 | case MOUNT_UNMOUNTING_SIGTERM: | |
1331 | mount_enter_dead_or_mounted(m, f); | |
1332 | break; | |
1333 | ||
1334 | default: | |
1335 | assert_not_reached("Uh, control process died at wrong time."); | |
1336 | } | |
1337 | ||
1338 | /* Notify clients about changed exit status */ | |
1339 | unit_add_to_dbus_queue(u); | |
1340 | } | |
1341 | ||
1342 | static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) { | |
1343 | Mount *m = MOUNT(userdata); | |
1344 | ||
1345 | assert(m); | |
1346 | assert(m->timer_event_source == source); | |
1347 | ||
1348 | switch (m->state) { | |
1349 | ||
1350 | case MOUNT_MOUNTING: | |
1351 | case MOUNT_MOUNTING_DONE: | |
1352 | log_unit_warning(UNIT(m), "Mounting timed out. Terminating."); | |
1353 | mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT); | |
1354 | break; | |
1355 | ||
1356 | case MOUNT_REMOUNTING: | |
1357 | log_unit_warning(UNIT(m), "Remounting timed out. Terminating remount process."); | |
1358 | mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT); | |
1359 | mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, MOUNT_SUCCESS); | |
1360 | break; | |
1361 | ||
1362 | case MOUNT_REMOUNTING_SIGTERM: | |
1363 | mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT); | |
1364 | ||
1365 | if (m->kill_context.send_sigkill) { | |
1366 | log_unit_warning(UNIT(m), "Remounting timed out. Killing."); | |
1367 | mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS); | |
1368 | } else { | |
1369 | log_unit_warning(UNIT(m), "Remounting timed out. Skipping SIGKILL. Ignoring."); | |
1370 | mount_enter_dead_or_mounted(m, MOUNT_SUCCESS); | |
1371 | } | |
1372 | break; | |
1373 | ||
1374 | case MOUNT_REMOUNTING_SIGKILL: | |
1375 | mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT); | |
1376 | ||
1377 | log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring."); | |
1378 | mount_enter_dead_or_mounted(m, MOUNT_SUCCESS); | |
1379 | break; | |
1380 | ||
1381 | case MOUNT_UNMOUNTING: | |
1382 | log_unit_warning(UNIT(m), "Unmounting timed out. Terminating."); | |
1383 | mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT); | |
1384 | break; | |
1385 | ||
1386 | case MOUNT_UNMOUNTING_SIGTERM: | |
1387 | if (m->kill_context.send_sigkill) { | |
1388 | log_unit_warning(UNIT(m), "Mount process timed out. Killing."); | |
1389 | mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT); | |
1390 | } else { | |
1391 | log_unit_warning(UNIT(m), "Mount process timed out. Skipping SIGKILL. Ignoring."); | |
1392 | mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT); | |
1393 | } | |
1394 | break; | |
1395 | ||
1396 | case MOUNT_UNMOUNTING_SIGKILL: | |
1397 | log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring."); | |
1398 | mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT); | |
1399 | break; | |
1400 | ||
1401 | default: | |
1402 | assert_not_reached("Timeout at wrong time."); | |
1403 | } | |
1404 | ||
1405 | return 0; | |
1406 | } | |
1407 | ||
1408 | typedef struct { | |
1409 | bool is_mounted; | |
1410 | bool just_mounted; | |
1411 | bool just_changed; | |
1412 | } MountSetupFlags; | |
1413 | ||
1414 | static int mount_setup_new_unit( | |
1415 | Unit *u, | |
1416 | const char *what, | |
1417 | const char *where, | |
1418 | const char *options, | |
1419 | const char *fstype, | |
1420 | MountSetupFlags *flags) { | |
1421 | ||
1422 | MountParameters *p; | |
1423 | ||
1424 | assert(u); | |
1425 | assert(flags); | |
1426 | ||
1427 | u->source_path = strdup("/proc/self/mountinfo"); | |
1428 | MOUNT(u)->where = strdup(where); | |
1429 | if (!u->source_path || !MOUNT(u)->where) | |
1430 | return -ENOMEM; | |
1431 | ||
1432 | /* Make sure to initialize those fields before mount_is_extrinsic(). */ | |
1433 | MOUNT(u)->from_proc_self_mountinfo = true; | |
1434 | p = &MOUNT(u)->parameters_proc_self_mountinfo; | |
1435 | ||
1436 | p->what = strdup(what); | |
1437 | p->options = strdup(options); | |
1438 | p->fstype = strdup(fstype); | |
1439 | if (!p->what || !p->options || !p->fstype) | |
1440 | return -ENOMEM; | |
1441 | ||
1442 | if (!mount_is_extrinsic(MOUNT(u))) { | |
1443 | const char *target; | |
1444 | int r; | |
1445 | ||
1446 | target = mount_is_network(p) ? SPECIAL_REMOTE_FS_TARGET : SPECIAL_LOCAL_FS_TARGET; | |
1447 | r = unit_add_dependency_by_name(u, UNIT_BEFORE, target, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT); | |
1448 | if (r < 0) | |
1449 | return r; | |
1450 | ||
1451 | r = unit_add_dependency_by_name(u, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT); | |
1452 | if (r < 0) | |
1453 | return r; | |
1454 | } | |
1455 | ||
1456 | unit_add_to_load_queue(u); | |
1457 | flags->is_mounted = true; | |
1458 | flags->just_mounted = true; | |
1459 | flags->just_changed = true; | |
1460 | ||
1461 | return 0; | |
1462 | } | |
1463 | ||
1464 | static int mount_setup_existing_unit( | |
1465 | Unit *u, | |
1466 | const char *what, | |
1467 | const char *where, | |
1468 | const char *options, | |
1469 | const char *fstype, | |
1470 | MountSetupFlags *flags) { | |
1471 | ||
1472 | MountParameters *p; | |
1473 | bool load_extras = false; | |
1474 | int r1, r2, r3; | |
1475 | ||
1476 | assert(u); | |
1477 | assert(flags); | |
1478 | ||
1479 | if (!MOUNT(u)->where) { | |
1480 | MOUNT(u)->where = strdup(where); | |
1481 | if (!MOUNT(u)->where) | |
1482 | return -ENOMEM; | |
1483 | } | |
1484 | ||
1485 | /* Make sure to initialize those fields before mount_is_extrinsic(). */ | |
1486 | p = &MOUNT(u)->parameters_proc_self_mountinfo; | |
1487 | ||
1488 | r1 = free_and_strdup(&p->what, what); | |
1489 | r2 = free_and_strdup(&p->options, options); | |
1490 | r3 = free_and_strdup(&p->fstype, fstype); | |
1491 | if (r1 < 0 || r2 < 0 || r3 < 0) | |
1492 | return -ENOMEM; | |
1493 | ||
1494 | flags->just_changed = r1 > 0 || r2 > 0 || r3 > 0; | |
1495 | flags->is_mounted = true; | |
1496 | flags->just_mounted = !MOUNT(u)->from_proc_self_mountinfo || MOUNT(u)->just_mounted; | |
1497 | ||
1498 | MOUNT(u)->from_proc_self_mountinfo = true; | |
1499 | ||
1500 | if (!mount_is_extrinsic(MOUNT(u)) && mount_is_network(p)) { | |
1501 | /* _netdev option may have shown up late, or on a | |
1502 | * remount. Add remote-fs dependencies, even though | |
1503 | * local-fs ones may already be there. | |
1504 | * | |
1505 | * Note: due to a current limitation (we don't track | |
1506 | * in the dependency "Set*" objects who created a | |
1507 | * dependency), we can only add deps, never lose them, | |
1508 | * until the next full daemon-reload. */ | |
1509 | unit_add_dependency_by_name(u, UNIT_BEFORE, SPECIAL_REMOTE_FS_TARGET, true, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT); | |
1510 | load_extras = true; | |
1511 | } | |
1512 | ||
1513 | if (u->load_state == UNIT_NOT_FOUND) { | |
1514 | u->load_state = UNIT_LOADED; | |
1515 | u->load_error = 0; | |
1516 | ||
1517 | /* Load in the extras later on, after we | |
1518 | * finished initialization of the unit */ | |
1519 | ||
1520 | /* FIXME: since we're going to load the unit later on, why setting load_extras=true ? */ | |
1521 | load_extras = true; | |
1522 | flags->just_changed = true; | |
1523 | } | |
1524 | ||
1525 | if (load_extras) | |
1526 | return mount_add_extras(MOUNT(u)); | |
1527 | ||
1528 | return 0; | |
1529 | } | |
1530 | ||
1531 | static int mount_setup_unit( | |
1532 | Manager *m, | |
1533 | const char *what, | |
1534 | const char *where, | |
1535 | const char *options, | |
1536 | const char *fstype, | |
1537 | bool set_flags) { | |
1538 | ||
1539 | _cleanup_free_ char *e = NULL; | |
1540 | MountSetupFlags flags; | |
1541 | Unit *u; | |
1542 | int r; | |
1543 | ||
1544 | assert(m); | |
1545 | assert(what); | |
1546 | assert(where); | |
1547 | assert(options); | |
1548 | assert(fstype); | |
1549 | ||
1550 | /* Ignore API mount points. They should never be referenced in | |
1551 | * dependencies ever. */ | |
1552 | if (mount_point_is_api(where) || mount_point_ignore(where)) | |
1553 | return 0; | |
1554 | ||
1555 | if (streq(fstype, "autofs")) | |
1556 | return 0; | |
1557 | ||
1558 | /* probably some kind of swap, ignore */ | |
1559 | if (!is_path(where)) | |
1560 | return 0; | |
1561 | ||
1562 | r = unit_name_from_path(where, ".mount", &e); | |
1563 | if (r < 0) | |
1564 | return r; | |
1565 | ||
1566 | u = manager_get_unit(m, e); | |
1567 | if (!u) { | |
1568 | /* First time we see this mount point meaning that it's | |
1569 | * not been initiated by a mount unit but rather by the | |
1570 | * sysadmin having called mount(8) directly. */ | |
1571 | r = unit_new_for_name(m, sizeof(Mount), e, &u); | |
1572 | if (r < 0) | |
1573 | goto fail; | |
1574 | ||
1575 | r = mount_setup_new_unit(u, what, where, options, fstype, &flags); | |
1576 | if (r < 0) | |
1577 | unit_free(u); | |
1578 | } else | |
1579 | r = mount_setup_existing_unit(u, what, where, options, fstype, &flags); | |
1580 | ||
1581 | if (r < 0) | |
1582 | goto fail; | |
1583 | ||
1584 | if (set_flags) { | |
1585 | MOUNT(u)->is_mounted = flags.is_mounted; | |
1586 | MOUNT(u)->just_mounted = flags.just_mounted; | |
1587 | MOUNT(u)->just_changed = flags.just_changed; | |
1588 | } | |
1589 | ||
1590 | if (flags.just_changed) | |
1591 | unit_add_to_dbus_queue(u); | |
1592 | ||
1593 | return 0; | |
1594 | fail: | |
1595 | return log_warning_errno(r, "Failed to set up mount unit: %m"); | |
1596 | } | |
1597 | ||
1598 | static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) { | |
1599 | _cleanup_(mnt_free_tablep) struct libmnt_table *t = NULL; | |
1600 | _cleanup_(mnt_free_iterp) struct libmnt_iter *i = NULL; | |
1601 | int r = 0; | |
1602 | ||
1603 | assert(m); | |
1604 | ||
1605 | t = mnt_new_table(); | |
1606 | i = mnt_new_iter(MNT_ITER_FORWARD); | |
1607 | if (!t || !i) | |
1608 | return log_oom(); | |
1609 | ||
1610 | r = mnt_table_parse_mtab(t, NULL); | |
1611 | if (r < 0) | |
1612 | return log_error_errno(r, "Failed to parse /proc/self/mountinfo: %m"); | |
1613 | ||
1614 | r = 0; | |
1615 | for (;;) { | |
1616 | struct libmnt_fs *fs; | |
1617 | const char *device, *path, *options, *fstype; | |
1618 | _cleanup_free_ char *d = NULL, *p = NULL; | |
1619 | int k; | |
1620 | ||
1621 | k = mnt_table_next_fs(t, i, &fs); | |
1622 | if (k == 1) | |
1623 | break; | |
1624 | if (k < 0) | |
1625 | return log_error_errno(k, "Failed to get next entry from /proc/self/mountinfo: %m"); | |
1626 | ||
1627 | device = mnt_fs_get_source(fs); | |
1628 | path = mnt_fs_get_target(fs); | |
1629 | options = mnt_fs_get_options(fs); | |
1630 | fstype = mnt_fs_get_fstype(fs); | |
1631 | ||
1632 | if (!device || !path) | |
1633 | continue; | |
1634 | ||
1635 | if (cunescape(device, UNESCAPE_RELAX, &d) < 0) | |
1636 | return log_oom(); | |
1637 | ||
1638 | if (cunescape(path, UNESCAPE_RELAX, &p) < 0) | |
1639 | return log_oom(); | |
1640 | ||
1641 | device_found_node(m, d, DEVICE_FOUND_MOUNT, DEVICE_FOUND_MOUNT); | |
1642 | ||
1643 | k = mount_setup_unit(m, d, p, options, fstype, set_flags); | |
1644 | if (r == 0 && k < 0) | |
1645 | r = k; | |
1646 | } | |
1647 | ||
1648 | return r; | |
1649 | } | |
1650 | ||
1651 | static void mount_shutdown(Manager *m) { | |
1652 | assert(m); | |
1653 | ||
1654 | m->mount_event_source = sd_event_source_unref(m->mount_event_source); | |
1655 | ||
1656 | mnt_unref_monitor(m->mount_monitor); | |
1657 | m->mount_monitor = NULL; | |
1658 | } | |
1659 | ||
1660 | static int mount_get_timeout(Unit *u, usec_t *timeout) { | |
1661 | Mount *m = MOUNT(u); | |
1662 | usec_t t; | |
1663 | int r; | |
1664 | ||
1665 | if (!m->timer_event_source) | |
1666 | return 0; | |
1667 | ||
1668 | r = sd_event_source_get_time(m->timer_event_source, &t); | |
1669 | if (r < 0) | |
1670 | return r; | |
1671 | if (t == USEC_INFINITY) | |
1672 | return 0; | |
1673 | ||
1674 | *timeout = t; | |
1675 | return 1; | |
1676 | } | |
1677 | ||
1678 | static void mount_enumerate_perpetual(Manager *m) { | |
1679 | Unit *u; | |
1680 | int r; | |
1681 | ||
1682 | assert(m); | |
1683 | ||
1684 | /* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's | |
1685 | * unconditionally synthesize it here and mark it as perpetual. */ | |
1686 | ||
1687 | u = manager_get_unit(m, SPECIAL_ROOT_MOUNT); | |
1688 | if (!u) { | |
1689 | r = unit_new_for_name(m, sizeof(Mount), SPECIAL_ROOT_MOUNT, &u); | |
1690 | if (r < 0) { | |
1691 | log_error_errno(r, "Failed to allocate the special " SPECIAL_ROOT_MOUNT " unit: %m"); | |
1692 | return; | |
1693 | } | |
1694 | } | |
1695 | ||
1696 | u->perpetual = true; | |
1697 | MOUNT(u)->deserialized_state = MOUNT_MOUNTED; | |
1698 | ||
1699 | unit_add_to_load_queue(u); | |
1700 | unit_add_to_dbus_queue(u); | |
1701 | } | |
1702 | ||
1703 | static bool mount_is_mounted(Mount *m) { | |
1704 | assert(m); | |
1705 | ||
1706 | return UNIT(m)->perpetual || m->is_mounted; | |
1707 | } | |
1708 | ||
1709 | static void mount_enumerate(Manager *m) { | |
1710 | int r; | |
1711 | ||
1712 | assert(m); | |
1713 | ||
1714 | mnt_init_debug(0); | |
1715 | ||
1716 | if (!m->mount_monitor) { | |
1717 | int fd; | |
1718 | ||
1719 | m->mount_monitor = mnt_new_monitor(); | |
1720 | if (!m->mount_monitor) { | |
1721 | log_oom(); | |
1722 | goto fail; | |
1723 | } | |
1724 | ||
1725 | r = mnt_monitor_enable_kernel(m->mount_monitor, 1); | |
1726 | if (r < 0) { | |
1727 | log_error_errno(r, "Failed to enable watching of kernel mount events: %m"); | |
1728 | goto fail; | |
1729 | } | |
1730 | ||
1731 | r = mnt_monitor_enable_userspace(m->mount_monitor, 1, NULL); | |
1732 | if (r < 0) { | |
1733 | log_error_errno(r, "Failed to enable watching of userspace mount events: %m"); | |
1734 | goto fail; | |
1735 | } | |
1736 | ||
1737 | /* mnt_unref_monitor() will close the fd */ | |
1738 | fd = r = mnt_monitor_get_fd(m->mount_monitor); | |
1739 | if (r < 0) { | |
1740 | log_error_errno(r, "Failed to acquire watch file descriptor: %m"); | |
1741 | goto fail; | |
1742 | } | |
1743 | ||
1744 | r = sd_event_add_io(m->event, &m->mount_event_source, fd, EPOLLIN, mount_dispatch_io, m); | |
1745 | if (r < 0) { | |
1746 | log_error_errno(r, "Failed to watch mount file descriptor: %m"); | |
1747 | goto fail; | |
1748 | } | |
1749 | ||
1750 | r = sd_event_source_set_priority(m->mount_event_source, SD_EVENT_PRIORITY_NORMAL-10); | |
1751 | if (r < 0) { | |
1752 | log_error_errno(r, "Failed to adjust mount watch priority: %m"); | |
1753 | goto fail; | |
1754 | } | |
1755 | ||
1756 | (void) sd_event_source_set_description(m->mount_event_source, "mount-monitor-dispatch"); | |
1757 | } | |
1758 | ||
1759 | r = mount_load_proc_self_mountinfo(m, false); | |
1760 | if (r < 0) | |
1761 | goto fail; | |
1762 | ||
1763 | return; | |
1764 | ||
1765 | fail: | |
1766 | mount_shutdown(m); | |
1767 | } | |
1768 | ||
1769 | static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { | |
1770 | _cleanup_set_free_ Set *around = NULL, *gone = NULL; | |
1771 | Manager *m = userdata; | |
1772 | const char *what; | |
1773 | Iterator i; | |
1774 | Unit *u; | |
1775 | int r; | |
1776 | ||
1777 | assert(m); | |
1778 | assert(revents & EPOLLIN); | |
1779 | ||
1780 | if (fd == mnt_monitor_get_fd(m->mount_monitor)) { | |
1781 | bool rescan = false; | |
1782 | ||
1783 | /* Drain all events and verify that the event is valid. | |
1784 | * | |
1785 | * Note that libmount also monitors /run/mount mkdir if the | |
1786 | * directory does not exist yet. The mkdir may generate event | |
1787 | * which is irrelevant for us. | |
1788 | * | |
1789 | * error: r < 0; valid: r == 0, false positive: rc == 1 */ | |
1790 | do { | |
1791 | r = mnt_monitor_next_change(m->mount_monitor, NULL, NULL); | |
1792 | if (r == 0) | |
1793 | rescan = true; | |
1794 | else if (r < 0) | |
1795 | return log_error_errno(r, "Failed to drain libmount events: %m"); | |
1796 | } while (r == 0); | |
1797 | ||
1798 | log_debug("libmount event [rescan: %s]", yes_no(rescan)); | |
1799 | if (!rescan) | |
1800 | return 0; | |
1801 | } | |
1802 | ||
1803 | r = mount_load_proc_self_mountinfo(m, true); | |
1804 | if (r < 0) { | |
1805 | /* Reset flags, just in case, for later calls */ | |
1806 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) { | |
1807 | Mount *mount = MOUNT(u); | |
1808 | ||
1809 | mount->is_mounted = mount->just_mounted = mount->just_changed = false; | |
1810 | } | |
1811 | ||
1812 | return 0; | |
1813 | } | |
1814 | ||
1815 | manager_dispatch_load_queue(m); | |
1816 | ||
1817 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) { | |
1818 | Mount *mount = MOUNT(u); | |
1819 | ||
1820 | if (!mount_is_mounted(mount)) { | |
1821 | ||
1822 | /* A mount point is not around right now. It | |
1823 | * might be gone, or might never have | |
1824 | * existed. */ | |
1825 | ||
1826 | if (mount->from_proc_self_mountinfo && | |
1827 | mount->parameters_proc_self_mountinfo.what) { | |
1828 | ||
1829 | /* Remember that this device might just have disappeared */ | |
1830 | if (set_ensure_allocated(&gone, &path_hash_ops) < 0 || | |
1831 | set_put(gone, mount->parameters_proc_self_mountinfo.what) < 0) | |
1832 | log_oom(); /* we don't care too much about OOM here... */ | |
1833 | } | |
1834 | ||
1835 | mount->from_proc_self_mountinfo = false; | |
1836 | ||
1837 | switch (mount->state) { | |
1838 | ||
1839 | case MOUNT_MOUNTED: | |
1840 | /* This has just been unmounted by | |
1841 | * somebody else, follow the state | |
1842 | * change. */ | |
1843 | mount->result = MOUNT_SUCCESS; /* make sure we forget any earlier umount failures */ | |
1844 | mount_enter_dead(mount, MOUNT_SUCCESS); | |
1845 | break; | |
1846 | ||
1847 | default: | |
1848 | break; | |
1849 | } | |
1850 | ||
1851 | } else if (mount->just_mounted || mount->just_changed) { | |
1852 | ||
1853 | /* A mount point was added or changed */ | |
1854 | ||
1855 | switch (mount->state) { | |
1856 | ||
1857 | 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 | (void) unit_acquire_invocation_id(UNIT(mount)); | |
1863 | mount_enter_mounted(mount, MOUNT_SUCCESS); | |
1864 | break; | |
1865 | ||
1866 | case MOUNT_MOUNTING: | |
1867 | mount_set_state(mount, MOUNT_MOUNTING_DONE); | |
1868 | break; | |
1869 | ||
1870 | default: | |
1871 | /* Nothing really changed, but let's | |
1872 | * issue an notification call | |
1873 | * nonetheless, in case somebody is | |
1874 | * waiting for this. (e.g. file system | |
1875 | * ro/rw remounts.) */ | |
1876 | mount_set_state(mount, mount->state); | |
1877 | break; | |
1878 | } | |
1879 | } | |
1880 | ||
1881 | if (mount_is_mounted(mount) && | |
1882 | mount->from_proc_self_mountinfo && | |
1883 | mount->parameters_proc_self_mountinfo.what) { | |
1884 | ||
1885 | if (set_ensure_allocated(&around, &path_hash_ops) < 0 || | |
1886 | set_put(around, mount->parameters_proc_self_mountinfo.what) < 0) | |
1887 | log_oom(); | |
1888 | } | |
1889 | ||
1890 | /* Reset the flags for later calls */ | |
1891 | mount->is_mounted = mount->just_mounted = mount->just_changed = false; | |
1892 | } | |
1893 | ||
1894 | SET_FOREACH(what, gone, i) { | |
1895 | if (set_contains(around, what)) | |
1896 | continue; | |
1897 | ||
1898 | /* Let the device units know that the device is no longer mounted */ | |
1899 | device_found_node(m, what, 0, DEVICE_FOUND_MOUNT); | |
1900 | } | |
1901 | ||
1902 | return 0; | |
1903 | } | |
1904 | ||
1905 | static void mount_reset_failed(Unit *u) { | |
1906 | Mount *m = MOUNT(u); | |
1907 | ||
1908 | assert(m); | |
1909 | ||
1910 | if (m->state == MOUNT_FAILED) | |
1911 | mount_set_state(m, MOUNT_DEAD); | |
1912 | ||
1913 | m->result = MOUNT_SUCCESS; | |
1914 | m->reload_result = MOUNT_SUCCESS; | |
1915 | } | |
1916 | ||
1917 | static int mount_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { | |
1918 | Mount *m = MOUNT(u); | |
1919 | ||
1920 | assert(m); | |
1921 | ||
1922 | return unit_kill_common(u, who, signo, -1, MOUNT(u)->control_pid, error); | |
1923 | } | |
1924 | ||
1925 | static int mount_control_pid(Unit *u) { | |
1926 | Mount *m = MOUNT(u); | |
1927 | ||
1928 | assert(m); | |
1929 | ||
1930 | return m->control_pid; | |
1931 | } | |
1932 | ||
1933 | static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = { | |
1934 | [MOUNT_EXEC_MOUNT] = "ExecMount", | |
1935 | [MOUNT_EXEC_UNMOUNT] = "ExecUnmount", | |
1936 | [MOUNT_EXEC_REMOUNT] = "ExecRemount", | |
1937 | }; | |
1938 | ||
1939 | DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand); | |
1940 | ||
1941 | static const char* const mount_result_table[_MOUNT_RESULT_MAX] = { | |
1942 | [MOUNT_SUCCESS] = "success", | |
1943 | [MOUNT_FAILURE_RESOURCES] = "resources", | |
1944 | [MOUNT_FAILURE_TIMEOUT] = "timeout", | |
1945 | [MOUNT_FAILURE_EXIT_CODE] = "exit-code", | |
1946 | [MOUNT_FAILURE_SIGNAL] = "signal", | |
1947 | [MOUNT_FAILURE_CORE_DUMP] = "core-dump", | |
1948 | [MOUNT_FAILURE_START_LIMIT_HIT] = "start-limit-hit", | |
1949 | [MOUNT_FAILURE_PROTOCOL] = "protocol", | |
1950 | }; | |
1951 | ||
1952 | DEFINE_STRING_TABLE_LOOKUP(mount_result, MountResult); | |
1953 | ||
1954 | const UnitVTable mount_vtable = { | |
1955 | .object_size = sizeof(Mount), | |
1956 | .exec_context_offset = offsetof(Mount, exec_context), | |
1957 | .cgroup_context_offset = offsetof(Mount, cgroup_context), | |
1958 | .kill_context_offset = offsetof(Mount, kill_context), | |
1959 | .exec_runtime_offset = offsetof(Mount, exec_runtime), | |
1960 | .dynamic_creds_offset = offsetof(Mount, dynamic_creds), | |
1961 | ||
1962 | .sections = | |
1963 | "Unit\0" | |
1964 | "Mount\0" | |
1965 | "Install\0", | |
1966 | .private_section = "Mount", | |
1967 | ||
1968 | .init = mount_init, | |
1969 | .load = mount_load, | |
1970 | .done = mount_done, | |
1971 | ||
1972 | .coldplug = mount_coldplug, | |
1973 | ||
1974 | .dump = mount_dump, | |
1975 | ||
1976 | .start = mount_start, | |
1977 | .stop = mount_stop, | |
1978 | .reload = mount_reload, | |
1979 | ||
1980 | .kill = mount_kill, | |
1981 | ||
1982 | .serialize = mount_serialize, | |
1983 | .deserialize_item = mount_deserialize_item, | |
1984 | ||
1985 | .active_state = mount_active_state, | |
1986 | .sub_state_to_string = mount_sub_state_to_string, | |
1987 | ||
1988 | .may_gc = mount_may_gc, | |
1989 | ||
1990 | .sigchld_event = mount_sigchld_event, | |
1991 | ||
1992 | .reset_failed = mount_reset_failed, | |
1993 | ||
1994 | .control_pid = mount_control_pid, | |
1995 | ||
1996 | .bus_vtable = bus_mount_vtable, | |
1997 | .bus_set_property = bus_mount_set_property, | |
1998 | .bus_commit_properties = bus_mount_commit_properties, | |
1999 | ||
2000 | .get_timeout = mount_get_timeout, | |
2001 | ||
2002 | .can_transient = true, | |
2003 | ||
2004 | .enumerate_perpetual = mount_enumerate_perpetual, | |
2005 | .enumerate = mount_enumerate, | |
2006 | .shutdown = mount_shutdown, | |
2007 | ||
2008 | .status_message_formats = { | |
2009 | .starting_stopping = { | |
2010 | [0] = "Mounting %s...", | |
2011 | [1] = "Unmounting %s...", | |
2012 | }, | |
2013 | .finished_start_job = { | |
2014 | [JOB_DONE] = "Mounted %s.", | |
2015 | [JOB_FAILED] = "Failed to mount %s.", | |
2016 | [JOB_TIMEOUT] = "Timed out mounting %s.", | |
2017 | }, | |
2018 | .finished_stop_job = { | |
2019 | [JOB_DONE] = "Unmounted %s.", | |
2020 | [JOB_FAILED] = "Failed unmounting %s.", | |
2021 | [JOB_TIMEOUT] = "Timed out unmounting %s.", | |
2022 | }, | |
2023 | }, | |
2024 | }; |