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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 "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 | [MOUNT_CLEANING] = UNIT_MAINTENANCE, | |
50 | }; | |
51 | ||
52 | static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata); | |
53 | static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); | |
54 | static int mount_process_proc_self_mountinfo(Manager *m); | |
55 | ||
56 | static bool MOUNT_STATE_WITH_PROCESS(MountState state) { | |
57 | return IN_SET(state, | |
58 | MOUNT_MOUNTING, | |
59 | MOUNT_MOUNTING_DONE, | |
60 | MOUNT_REMOUNTING, | |
61 | MOUNT_REMOUNTING_SIGTERM, | |
62 | MOUNT_REMOUNTING_SIGKILL, | |
63 | MOUNT_UNMOUNTING, | |
64 | MOUNT_UNMOUNTING_SIGTERM, | |
65 | MOUNT_UNMOUNTING_SIGKILL, | |
66 | MOUNT_CLEANING); | |
67 | } | |
68 | ||
69 | static bool mount_is_network(const MountParameters *p) { | |
70 | assert(p); | |
71 | ||
72 | if (fstab_test_option(p->options, "_netdev\0")) | |
73 | return true; | |
74 | ||
75 | if (p->fstype && fstype_is_network(p->fstype)) | |
76 | return true; | |
77 | ||
78 | return false; | |
79 | } | |
80 | ||
81 | static bool mount_is_loop(const MountParameters *p) { | |
82 | assert(p); | |
83 | ||
84 | if (fstab_test_option(p->options, "loop\0")) | |
85 | return true; | |
86 | ||
87 | return false; | |
88 | } | |
89 | ||
90 | static bool mount_is_bind(const MountParameters *p) { | |
91 | assert(p); | |
92 | ||
93 | if (fstab_test_option(p->options, "bind\0" "rbind\0")) | |
94 | return true; | |
95 | ||
96 | if (p->fstype && STR_IN_SET(p->fstype, "bind", "rbind")) | |
97 | return true; | |
98 | ||
99 | return false; | |
100 | } | |
101 | ||
102 | static bool mount_is_bound_to_device(const Mount *m) { | |
103 | const MountParameters *p; | |
104 | ||
105 | if (m->from_fragment) | |
106 | return true; | |
107 | ||
108 | p = &m->parameters_proc_self_mountinfo; | |
109 | return fstab_test_option(p->options, "x-systemd.device-bound\0"); | |
110 | } | |
111 | ||
112 | static bool mount_needs_quota(const MountParameters *p) { | |
113 | assert(p); | |
114 | ||
115 | /* Quotas are not enabled on network filesystems, but we want them, for example, on storage connected via | |
116 | * iscsi. We hence don't use mount_is_network() here, as that would also return true for _netdev devices. */ | |
117 | if (p->fstype && fstype_is_network(p->fstype)) | |
118 | return false; | |
119 | ||
120 | if (mount_is_bind(p)) | |
121 | return false; | |
122 | ||
123 | return fstab_test_option(p->options, | |
124 | "usrquota\0" "grpquota\0" "quota\0" "usrjquota\0" "grpjquota\0"); | |
125 | } | |
126 | ||
127 | static void mount_init(Unit *u) { | |
128 | Mount *m = MOUNT(u); | |
129 | ||
130 | assert(u); | |
131 | assert(u->load_state == UNIT_STUB); | |
132 | ||
133 | m->timeout_usec = u->manager->default_timeout_start_usec; | |
134 | ||
135 | m->exec_context.std_output = u->manager->default_std_output; | |
136 | m->exec_context.std_error = u->manager->default_std_error; | |
137 | ||
138 | m->directory_mode = 0755; | |
139 | ||
140 | /* We need to make sure that /usr/bin/mount is always called | |
141 | * in the same process group as us, so that the autofs kernel | |
142 | * side doesn't send us another mount request while we are | |
143 | * already trying to comply its last one. */ | |
144 | m->exec_context.same_pgrp = true; | |
145 | ||
146 | m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; | |
147 | ||
148 | u->ignore_on_isolate = true; | |
149 | } | |
150 | ||
151 | static int mount_arm_timer(Mount *m, usec_t usec) { | |
152 | int r; | |
153 | ||
154 | assert(m); | |
155 | ||
156 | if (m->timer_event_source) { | |
157 | r = sd_event_source_set_time(m->timer_event_source, usec); | |
158 | if (r < 0) | |
159 | return r; | |
160 | ||
161 | return sd_event_source_set_enabled(m->timer_event_source, SD_EVENT_ONESHOT); | |
162 | } | |
163 | ||
164 | if (usec == USEC_INFINITY) | |
165 | return 0; | |
166 | ||
167 | r = sd_event_add_time( | |
168 | UNIT(m)->manager->event, | |
169 | &m->timer_event_source, | |
170 | CLOCK_MONOTONIC, | |
171 | usec, 0, | |
172 | mount_dispatch_timer, m); | |
173 | if (r < 0) | |
174 | return r; | |
175 | ||
176 | (void) sd_event_source_set_description(m->timer_event_source, "mount-timer"); | |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
181 | static void mount_unwatch_control_pid(Mount *m) { | |
182 | assert(m); | |
183 | ||
184 | if (m->control_pid <= 0) | |
185 | return; | |
186 | ||
187 | unit_unwatch_pid(UNIT(m), m->control_pid); | |
188 | m->control_pid = 0; | |
189 | } | |
190 | ||
191 | static void mount_parameters_done(MountParameters *p) { | |
192 | assert(p); | |
193 | ||
194 | p->what = mfree(p->what); | |
195 | p->options = mfree(p->options); | |
196 | p->fstype = mfree(p->fstype); | |
197 | } | |
198 | ||
199 | static void mount_done(Unit *u) { | |
200 | Mount *m = MOUNT(u); | |
201 | ||
202 | assert(m); | |
203 | ||
204 | m->where = mfree(m->where); | |
205 | ||
206 | mount_parameters_done(&m->parameters_proc_self_mountinfo); | |
207 | mount_parameters_done(&m->parameters_fragment); | |
208 | ||
209 | m->exec_runtime = exec_runtime_unref(m->exec_runtime, false); | |
210 | exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX); | |
211 | m->control_command = NULL; | |
212 | ||
213 | dynamic_creds_unref(&m->dynamic_creds); | |
214 | ||
215 | mount_unwatch_control_pid(m); | |
216 | ||
217 | m->timer_event_source = sd_event_source_unref(m->timer_event_source); | |
218 | } | |
219 | ||
220 | _pure_ static MountParameters* get_mount_parameters_fragment(Mount *m) { | |
221 | assert(m); | |
222 | ||
223 | if (m->from_fragment) | |
224 | return &m->parameters_fragment; | |
225 | ||
226 | return NULL; | |
227 | } | |
228 | ||
229 | _pure_ static MountParameters* get_mount_parameters(Mount *m) { | |
230 | assert(m); | |
231 | ||
232 | if (m->from_proc_self_mountinfo) | |
233 | return &m->parameters_proc_self_mountinfo; | |
234 | ||
235 | return get_mount_parameters_fragment(m); | |
236 | } | |
237 | ||
238 | static int update_parameters_proc_self_mountinfo( | |
239 | Mount *m, | |
240 | const char *what, | |
241 | const char *options, | |
242 | const char *fstype) { | |
243 | ||
244 | MountParameters *p; | |
245 | int r, q, w; | |
246 | ||
247 | p = &m->parameters_proc_self_mountinfo; | |
248 | ||
249 | r = free_and_strdup(&p->what, what); | |
250 | if (r < 0) | |
251 | return r; | |
252 | ||
253 | q = free_and_strdup(&p->options, options); | |
254 | if (q < 0) | |
255 | return q; | |
256 | ||
257 | w = free_and_strdup(&p->fstype, fstype); | |
258 | if (w < 0) | |
259 | return w; | |
260 | ||
261 | return r > 0 || q > 0 || w > 0; | |
262 | } | |
263 | ||
264 | static int mount_add_mount_dependencies(Mount *m) { | |
265 | MountParameters *pm; | |
266 | Unit *other; | |
267 | Iterator i; | |
268 | Set *s; | |
269 | int r; | |
270 | ||
271 | assert(m); | |
272 | ||
273 | if (!path_equal(m->where, "/")) { | |
274 | _cleanup_free_ char *parent = NULL; | |
275 | ||
276 | /* Adds in links to other mount points that might lie further up in the hierarchy */ | |
277 | ||
278 | parent = dirname_malloc(m->where); | |
279 | if (!parent) | |
280 | return -ENOMEM; | |
281 | ||
282 | r = unit_require_mounts_for(UNIT(m), parent, UNIT_DEPENDENCY_IMPLICIT); | |
283 | if (r < 0) | |
284 | return r; | |
285 | } | |
286 | ||
287 | /* Adds in dependencies to other mount points that might be needed for the source path (if this is a bind mount | |
288 | * or a loop mount) to be available. */ | |
289 | pm = get_mount_parameters_fragment(m); | |
290 | if (pm && pm->what && | |
291 | path_is_absolute(pm->what) && | |
292 | (mount_is_bind(pm) || mount_is_loop(pm) || !mount_is_network(pm))) { | |
293 | ||
294 | r = unit_require_mounts_for(UNIT(m), pm->what, UNIT_DEPENDENCY_FILE); | |
295 | if (r < 0) | |
296 | return r; | |
297 | } | |
298 | ||
299 | /* Adds in dependencies to other units that use this path or paths further down in the hierarchy */ | |
300 | s = manager_get_units_requiring_mounts_for(UNIT(m)->manager, m->where); | |
301 | SET_FOREACH(other, s, i) { | |
302 | ||
303 | if (other->load_state != UNIT_LOADED) | |
304 | continue; | |
305 | ||
306 | if (other == UNIT(m)) | |
307 | continue; | |
308 | ||
309 | r = unit_add_dependency(other, UNIT_AFTER, UNIT(m), true, UNIT_DEPENDENCY_PATH); | |
310 | if (r < 0) | |
311 | return r; | |
312 | ||
313 | if (UNIT(m)->fragment_path) { | |
314 | /* If we have fragment configuration, then make this dependency required */ | |
315 | r = unit_add_dependency(other, UNIT_REQUIRES, UNIT(m), true, UNIT_DEPENDENCY_PATH); | |
316 | if (r < 0) | |
317 | return r; | |
318 | } | |
319 | } | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
324 | static int mount_add_device_dependencies(Mount *m) { | |
325 | UnitDependencyMask mask; | |
326 | MountParameters *p; | |
327 | UnitDependency dep; | |
328 | int r; | |
329 | ||
330 | assert(m); | |
331 | ||
332 | p = get_mount_parameters(m); | |
333 | if (!p) | |
334 | return 0; | |
335 | ||
336 | if (!p->what) | |
337 | return 0; | |
338 | ||
339 | if (mount_is_bind(p)) | |
340 | return 0; | |
341 | ||
342 | if (!is_device_path(p->what)) | |
343 | return 0; | |
344 | ||
345 | /* /dev/root is a really weird thing, it's not a real device, | |
346 | * but just a path the kernel exports for the root file system | |
347 | * specified on the kernel command line. Ignore it here. */ | |
348 | if (path_equal(p->what, "/dev/root")) | |
349 | return 0; | |
350 | ||
351 | if (path_equal(m->where, "/")) | |
352 | return 0; | |
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 | /* We always use 'what' from /proc/self/mountinfo if mounted */ | |
362 | mask = m->from_proc_self_mountinfo ? UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT : UNIT_DEPENDENCY_FILE; | |
363 | ||
364 | r = unit_add_node_dependency(UNIT(m), p->what, dep, mask); | |
365 | if (r < 0) | |
366 | return r; | |
367 | ||
368 | return 0; | |
369 | } | |
370 | ||
371 | static int mount_add_quota_dependencies(Mount *m) { | |
372 | UnitDependencyMask mask; | |
373 | MountParameters *p; | |
374 | int r; | |
375 | ||
376 | assert(m); | |
377 | ||
378 | if (!MANAGER_IS_SYSTEM(UNIT(m)->manager)) | |
379 | return 0; | |
380 | ||
381 | p = get_mount_parameters_fragment(m); | |
382 | if (!p) | |
383 | return 0; | |
384 | ||
385 | if (!mount_needs_quota(p)) | |
386 | return 0; | |
387 | ||
388 | mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT; | |
389 | ||
390 | r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, true, mask); | |
391 | if (r < 0) | |
392 | return r; | |
393 | ||
394 | r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, true, mask); | |
395 | if (r < 0) | |
396 | return r; | |
397 | ||
398 | return 0; | |
399 | } | |
400 | ||
401 | static bool mount_is_extrinsic(Mount *m) { | |
402 | MountParameters *p; | |
403 | assert(m); | |
404 | ||
405 | /* Returns true for all units that are "magic" and should be excluded from the usual start-up and shutdown | |
406 | * dependencies. We call them "extrinsic" here, as they are generally mounted outside of the systemd dependency | |
407 | * logic. We shouldn't attempt to manage them ourselves but it's fine if the user operates on them with us. */ | |
408 | ||
409 | if (!MANAGER_IS_SYSTEM(UNIT(m)->manager)) /* We only automatically manage mounts if we are in system mode */ | |
410 | return true; | |
411 | ||
412 | if (UNIT(m)->perpetual) /* All perpetual units never change state */ | |
413 | return true; | |
414 | ||
415 | if (PATH_IN_SET(m->where, /* Don't bother with the OS data itself */ | |
416 | "/", /* (strictly speaking redundant: should already be covered by the perpetual flag check above) */ | |
417 | "/usr", | |
418 | "/etc")) | |
419 | return true; | |
420 | ||
421 | if (PATH_STARTSWITH_SET(m->where, | |
422 | "/run/initramfs", /* This should stay around from before we boot until after we shutdown */ | |
423 | "/proc", /* All of this is API VFS */ | |
424 | "/sys", /* … dito … */ | |
425 | "/dev")) /* … dito … */ | |
426 | return true; | |
427 | ||
428 | /* If this is an initrd mount, and we are not in the initrd, then leave this around forever, too. */ | |
429 | p = get_mount_parameters(m); | |
430 | if (p && fstab_test_option(p->options, "x-initrd.mount\0") && !in_initrd()) | |
431 | return true; | |
432 | ||
433 | return false; | |
434 | } | |
435 | ||
436 | static int mount_add_default_dependencies(Mount *m) { | |
437 | const char *after, *before; | |
438 | UnitDependencyMask mask; | |
439 | MountParameters *p; | |
440 | bool nofail; | |
441 | int r; | |
442 | ||
443 | assert(m); | |
444 | ||
445 | if (!UNIT(m)->default_dependencies) | |
446 | return 0; | |
447 | ||
448 | /* We do not add any default dependencies to /, /usr or /run/initramfs/, since they are guaranteed to stay | |
449 | * mounted the whole time, since our system is on it. Also, don't bother with anything mounted below virtual | |
450 | * file systems, it's also going to be virtual, and hence not worth the effort. */ | |
451 | if (mount_is_extrinsic(m)) | |
452 | return 0; | |
453 | ||
454 | p = get_mount_parameters(m); | |
455 | if (!p) | |
456 | return 0; | |
457 | ||
458 | mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_DEFAULT; | |
459 | nofail = m->from_fragment ? fstab_test_yes_no_option(m->parameters_fragment.options, "nofail\0" "fail\0") : false; | |
460 | ||
461 | if (mount_is_network(p)) { | |
462 | /* We order ourselves after network.target. This is | |
463 | * primarily useful at shutdown: services that take | |
464 | * down the network should order themselves before | |
465 | * network.target, so that they are shut down only | |
466 | * after this mount unit is stopped. */ | |
467 | ||
468 | r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_NETWORK_TARGET, true, mask); | |
469 | if (r < 0) | |
470 | return r; | |
471 | ||
472 | /* We pull in network-online.target, and order | |
473 | * ourselves after it. This is useful at start-up to | |
474 | * actively pull in tools that want to be started | |
475 | * before we start mounting network file systems, and | |
476 | * whose purpose it is to delay this until the network | |
477 | * is "up". */ | |
478 | ||
479 | r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_WANTS, UNIT_AFTER, SPECIAL_NETWORK_ONLINE_TARGET, true, mask); | |
480 | if (r < 0) | |
481 | return r; | |
482 | ||
483 | after = SPECIAL_REMOTE_FS_PRE_TARGET; | |
484 | before = SPECIAL_REMOTE_FS_TARGET; | |
485 | } else { | |
486 | after = SPECIAL_LOCAL_FS_PRE_TARGET; | |
487 | before = SPECIAL_LOCAL_FS_TARGET; | |
488 | } | |
489 | ||
490 | if (!nofail) { | |
491 | r = unit_add_dependency_by_name(UNIT(m), UNIT_BEFORE, before, true, mask); | |
492 | if (r < 0) | |
493 | return r; | |
494 | } | |
495 | ||
496 | r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, true, mask); | |
497 | if (r < 0) | |
498 | return r; | |
499 | ||
500 | r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, true, mask); | |
501 | if (r < 0) | |
502 | return r; | |
503 | ||
504 | /* If this is a tmpfs mount then we have to unmount it before we try to deactivate swaps */ | |
505 | if (streq_ptr(p->fstype, "tmpfs")) { | |
506 | r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_SWAP_TARGET, true, mask); | |
507 | if (r < 0) | |
508 | return r; | |
509 | } | |
510 | ||
511 | return 0; | |
512 | } | |
513 | ||
514 | static int mount_verify(Mount *m) { | |
515 | _cleanup_free_ char *e = NULL; | |
516 | MountParameters *p; | |
517 | int r; | |
518 | ||
519 | assert(m); | |
520 | assert(UNIT(m)->load_state == UNIT_LOADED); | |
521 | ||
522 | if (!m->from_fragment && !m->from_proc_self_mountinfo && !UNIT(m)->perpetual) | |
523 | return -ENOENT; | |
524 | ||
525 | r = unit_name_from_path(m->where, ".mount", &e); | |
526 | if (r < 0) | |
527 | return log_unit_error_errno(UNIT(m), r, "Failed to generate unit name from mount path: %m"); | |
528 | ||
529 | if (!unit_has_name(UNIT(m), e)) { | |
530 | log_unit_error(UNIT(m), "Where= setting doesn't match unit name. Refusing."); | |
531 | return -ENOEXEC; | |
532 | } | |
533 | ||
534 | if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) { | |
535 | log_unit_error(UNIT(m), "Cannot create mount unit for API file system %s. Refusing.", m->where); | |
536 | return -ENOEXEC; | |
537 | } | |
538 | ||
539 | p = get_mount_parameters_fragment(m); | |
540 | if (p && !p->what && !UNIT(m)->perpetual) | |
541 | return log_unit_error_errno(UNIT(m), SYNTHETIC_ERRNO(ENOEXEC), | |
542 | "What= setting is missing. Refusing."); | |
543 | ||
544 | if (m->exec_context.pam_name && m->kill_context.kill_mode != KILL_CONTROL_GROUP) { | |
545 | log_unit_error(UNIT(m), "Unit has PAM enabled. Kill mode must be set to control-group'. Refusing."); | |
546 | return -ENOEXEC; | |
547 | } | |
548 | ||
549 | return 0; | |
550 | } | |
551 | ||
552 | static int mount_add_non_exec_dependencies(Mount *m) { | |
553 | int r; | |
554 | assert(m); | |
555 | ||
556 | /* Adds in all dependencies directly responsible for ordering the mount, as opposed to dependencies | |
557 | * resulting from the ExecContext and such. */ | |
558 | ||
559 | r = mount_add_device_dependencies(m); | |
560 | if (r < 0) | |
561 | return r; | |
562 | ||
563 | r = mount_add_mount_dependencies(m); | |
564 | if (r < 0) | |
565 | return r; | |
566 | ||
567 | r = mount_add_quota_dependencies(m); | |
568 | if (r < 0) | |
569 | return r; | |
570 | ||
571 | r = mount_add_default_dependencies(m); | |
572 | if (r < 0) | |
573 | return r; | |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
578 | static int mount_add_extras(Mount *m) { | |
579 | Unit *u = UNIT(m); | |
580 | int r; | |
581 | ||
582 | assert(m); | |
583 | ||
584 | /* Note: this call might be called after we already have been loaded once (and even when it has already been | |
585 | * activated), in case data from /proc/self/mountinfo has changed. This means all code here needs to be ready | |
586 | * to run with an already set up unit. */ | |
587 | ||
588 | if (u->fragment_path) | |
589 | m->from_fragment = true; | |
590 | ||
591 | if (!m->where) { | |
592 | r = unit_name_to_path(u->id, &m->where); | |
593 | if (r < 0) | |
594 | return r; | |
595 | } | |
596 | ||
597 | path_simplify(m->where, false); | |
598 | ||
599 | if (!u->description) { | |
600 | r = unit_set_description(u, m->where); | |
601 | if (r < 0) | |
602 | return r; | |
603 | } | |
604 | ||
605 | r = unit_patch_contexts(u); | |
606 | if (r < 0) | |
607 | return r; | |
608 | ||
609 | r = unit_add_exec_dependencies(u, &m->exec_context); | |
610 | if (r < 0) | |
611 | return r; | |
612 | ||
613 | r = unit_set_default_slice(u); | |
614 | if (r < 0) | |
615 | return r; | |
616 | ||
617 | r = mount_add_non_exec_dependencies(m); | |
618 | if (r < 0) | |
619 | return r; | |
620 | ||
621 | return 0; | |
622 | } | |
623 | ||
624 | static void mount_load_root_mount(Unit *u) { | |
625 | assert(u); | |
626 | ||
627 | if (!unit_has_name(u, SPECIAL_ROOT_MOUNT)) | |
628 | return; | |
629 | ||
630 | u->perpetual = true; | |
631 | u->default_dependencies = false; | |
632 | ||
633 | /* The stdio/kmsg bridge socket is on /, in order to avoid a dep loop, don't use kmsg logging for -.mount */ | |
634 | MOUNT(u)->exec_context.std_output = EXEC_OUTPUT_NULL; | |
635 | MOUNT(u)->exec_context.std_input = EXEC_INPUT_NULL; | |
636 | ||
637 | if (!u->description) | |
638 | u->description = strdup("Root Mount"); | |
639 | } | |
640 | ||
641 | static int mount_load(Unit *u) { | |
642 | Mount *m = MOUNT(u); | |
643 | int r, q = 0; | |
644 | ||
645 | assert(u); | |
646 | assert(u->load_state == UNIT_STUB); | |
647 | ||
648 | mount_load_root_mount(u); | |
649 | ||
650 | bool fragment_optional = m->from_proc_self_mountinfo || u->perpetual; | |
651 | r = unit_load_fragment_and_dropin(u, !fragment_optional); | |
652 | ||
653 | /* Add in some extras. Note we do this in all cases (even if we failed to load the unit) when announced by the | |
654 | * kernel, because we need some things to be set up no matter what when the kernel establishes a mount and thus | |
655 | * we need to update the state in our unit to track it. After all, consider that we don't allow changing the | |
656 | * 'slice' field for a unit once it is active. */ | |
657 | if (u->load_state == UNIT_LOADED || m->from_proc_self_mountinfo || u->perpetual) | |
658 | q = mount_add_extras(m); | |
659 | ||
660 | if (r < 0) | |
661 | return r; | |
662 | if (q < 0) | |
663 | return q; | |
664 | if (u->load_state != UNIT_LOADED) | |
665 | return 0; | |
666 | ||
667 | return mount_verify(m); | |
668 | } | |
669 | ||
670 | static void mount_set_state(Mount *m, MountState state) { | |
671 | MountState old_state; | |
672 | assert(m); | |
673 | ||
674 | if (m->state != state) | |
675 | bus_unit_send_pending_change_signal(UNIT(m), false); | |
676 | ||
677 | old_state = m->state; | |
678 | m->state = state; | |
679 | ||
680 | if (!MOUNT_STATE_WITH_PROCESS(state)) { | |
681 | m->timer_event_source = sd_event_source_unref(m->timer_event_source); | |
682 | mount_unwatch_control_pid(m); | |
683 | m->control_command = NULL; | |
684 | m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; | |
685 | } | |
686 | ||
687 | if (state != old_state) | |
688 | log_unit_debug(UNIT(m), "Changed %s -> %s", mount_state_to_string(old_state), mount_state_to_string(state)); | |
689 | ||
690 | unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state], | |
691 | m->reload_result == MOUNT_SUCCESS ? 0 : UNIT_NOTIFY_RELOAD_FAILURE); | |
692 | } | |
693 | ||
694 | static int mount_coldplug(Unit *u) { | |
695 | Mount *m = MOUNT(u); | |
696 | MountState new_state = MOUNT_DEAD; | |
697 | int r; | |
698 | ||
699 | assert(m); | |
700 | assert(m->state == MOUNT_DEAD); | |
701 | ||
702 | if (m->deserialized_state != m->state) | |
703 | new_state = m->deserialized_state; | |
704 | else if (m->from_proc_self_mountinfo) | |
705 | new_state = MOUNT_MOUNTED; | |
706 | ||
707 | if (new_state == m->state) | |
708 | return 0; | |
709 | ||
710 | if (m->control_pid > 0 && | |
711 | pid_is_unwaited(m->control_pid) && | |
712 | MOUNT_STATE_WITH_PROCESS(new_state)) { | |
713 | ||
714 | r = unit_watch_pid(UNIT(m), m->control_pid, false); | |
715 | if (r < 0) | |
716 | return r; | |
717 | ||
718 | r = mount_arm_timer(m, usec_add(u->state_change_timestamp.monotonic, m->timeout_usec)); | |
719 | if (r < 0) | |
720 | return r; | |
721 | } | |
722 | ||
723 | if (!IN_SET(new_state, MOUNT_DEAD, MOUNT_FAILED)) { | |
724 | (void) unit_setup_dynamic_creds(u); | |
725 | (void) unit_setup_exec_runtime(u); | |
726 | } | |
727 | ||
728 | mount_set_state(m, new_state); | |
729 | return 0; | |
730 | } | |
731 | ||
732 | static void mount_dump(Unit *u, FILE *f, const char *prefix) { | |
733 | char buf[FORMAT_TIMESPAN_MAX]; | |
734 | Mount *m = MOUNT(u); | |
735 | MountParameters *p; | |
736 | ||
737 | assert(m); | |
738 | assert(f); | |
739 | ||
740 | p = get_mount_parameters(m); | |
741 | ||
742 | fprintf(f, | |
743 | "%sMount State: %s\n" | |
744 | "%sResult: %s\n" | |
745 | "%sClean Result: %s\n" | |
746 | "%sWhere: %s\n" | |
747 | "%sWhat: %s\n" | |
748 | "%sFile System Type: %s\n" | |
749 | "%sOptions: %s\n" | |
750 | "%sFrom /proc/self/mountinfo: %s\n" | |
751 | "%sFrom fragment: %s\n" | |
752 | "%sExtrinsic: %s\n" | |
753 | "%sDirectoryMode: %04o\n" | |
754 | "%sSloppyOptions: %s\n" | |
755 | "%sLazyUnmount: %s\n" | |
756 | "%sForceUnmount: %s\n" | |
757 | "%sTimeoutSec: %s\n", | |
758 | prefix, mount_state_to_string(m->state), | |
759 | prefix, mount_result_to_string(m->result), | |
760 | prefix, mount_result_to_string(m->clean_result), | |
761 | prefix, m->where, | |
762 | prefix, p ? strna(p->what) : "n/a", | |
763 | prefix, p ? strna(p->fstype) : "n/a", | |
764 | prefix, p ? strna(p->options) : "n/a", | |
765 | prefix, yes_no(m->from_proc_self_mountinfo), | |
766 | prefix, yes_no(m->from_fragment), | |
767 | prefix, yes_no(mount_is_extrinsic(m)), | |
768 | prefix, m->directory_mode, | |
769 | prefix, yes_no(m->sloppy_options), | |
770 | prefix, yes_no(m->lazy_unmount), | |
771 | prefix, yes_no(m->force_unmount), | |
772 | prefix, format_timespan(buf, sizeof(buf), m->timeout_usec, USEC_PER_SEC)); | |
773 | ||
774 | if (m->control_pid > 0) | |
775 | fprintf(f, | |
776 | "%sControl PID: "PID_FMT"\n", | |
777 | prefix, m->control_pid); | |
778 | ||
779 | exec_context_dump(&m->exec_context, f, prefix); | |
780 | kill_context_dump(&m->kill_context, f, prefix); | |
781 | cgroup_context_dump(UNIT(m), f, prefix); | |
782 | } | |
783 | ||
784 | static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) { | |
785 | ||
786 | _cleanup_(exec_params_clear) ExecParameters exec_params = { | |
787 | .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN, | |
788 | .stdin_fd = -1, | |
789 | .stdout_fd = -1, | |
790 | .stderr_fd = -1, | |
791 | .exec_fd = -1, | |
792 | }; | |
793 | pid_t pid; | |
794 | int r; | |
795 | ||
796 | assert(m); | |
797 | assert(c); | |
798 | assert(_pid); | |
799 | ||
800 | r = unit_prepare_exec(UNIT(m)); | |
801 | if (r < 0) | |
802 | return r; | |
803 | ||
804 | r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec)); | |
805 | if (r < 0) | |
806 | return r; | |
807 | ||
808 | r = unit_set_exec_params(UNIT(m), &exec_params); | |
809 | if (r < 0) | |
810 | return r; | |
811 | ||
812 | r = exec_spawn(UNIT(m), | |
813 | c, | |
814 | &m->exec_context, | |
815 | &exec_params, | |
816 | m->exec_runtime, | |
817 | &m->dynamic_creds, | |
818 | &pid); | |
819 | if (r < 0) | |
820 | return r; | |
821 | ||
822 | r = unit_watch_pid(UNIT(m), pid, true); | |
823 | if (r < 0) | |
824 | return r; | |
825 | ||
826 | *_pid = pid; | |
827 | ||
828 | return 0; | |
829 | } | |
830 | ||
831 | static void mount_enter_dead(Mount *m, MountResult f) { | |
832 | assert(m); | |
833 | ||
834 | if (m->result == MOUNT_SUCCESS) | |
835 | m->result = f; | |
836 | ||
837 | unit_log_result(UNIT(m), m->result == MOUNT_SUCCESS, mount_result_to_string(m->result)); | |
838 | mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD); | |
839 | ||
840 | m->exec_runtime = exec_runtime_unref(m->exec_runtime, true); | |
841 | ||
842 | unit_destroy_runtime_directory(UNIT(m), &m->exec_context); | |
843 | ||
844 | unit_unref_uid_gid(UNIT(m), true); | |
845 | ||
846 | dynamic_creds_destroy(&m->dynamic_creds); | |
847 | ||
848 | /* Any dependencies based on /proc/self/mountinfo are now stale */ | |
849 | unit_remove_dependencies(UNIT(m), UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT); | |
850 | } | |
851 | ||
852 | static void mount_enter_mounted(Mount *m, MountResult f) { | |
853 | assert(m); | |
854 | ||
855 | if (m->result == MOUNT_SUCCESS) | |
856 | m->result = f; | |
857 | ||
858 | mount_set_state(m, MOUNT_MOUNTED); | |
859 | } | |
860 | ||
861 | static void mount_enter_dead_or_mounted(Mount *m, MountResult f) { | |
862 | assert(m); | |
863 | ||
864 | /* Enter DEAD or MOUNTED state, depending on what the kernel currently says about the mount point. We use this | |
865 | * whenever we executed an operation, so that our internal state reflects what the kernel says again, after all | |
866 | * ultimately we just mirror the kernel's internal state on this. */ | |
867 | ||
868 | if (m->from_proc_self_mountinfo) | |
869 | mount_enter_mounted(m, f); | |
870 | else | |
871 | mount_enter_dead(m, f); | |
872 | } | |
873 | ||
874 | static int state_to_kill_operation(MountState state) { | |
875 | switch (state) { | |
876 | ||
877 | case MOUNT_REMOUNTING_SIGTERM: | |
878 | return KILL_RESTART; | |
879 | ||
880 | case MOUNT_UNMOUNTING_SIGTERM: | |
881 | return KILL_TERMINATE; | |
882 | ||
883 | case MOUNT_REMOUNTING_SIGKILL: | |
884 | case MOUNT_UNMOUNTING_SIGKILL: | |
885 | return KILL_KILL; | |
886 | ||
887 | default: | |
888 | return _KILL_OPERATION_INVALID; | |
889 | } | |
890 | } | |
891 | ||
892 | static void mount_enter_signal(Mount *m, MountState state, MountResult f) { | |
893 | int r; | |
894 | ||
895 | assert(m); | |
896 | ||
897 | if (m->result == MOUNT_SUCCESS) | |
898 | m->result = f; | |
899 | ||
900 | r = unit_kill_context( | |
901 | UNIT(m), | |
902 | &m->kill_context, | |
903 | state_to_kill_operation(state), | |
904 | -1, | |
905 | m->control_pid, | |
906 | false); | |
907 | if (r < 0) | |
908 | goto fail; | |
909 | ||
910 | if (r > 0) { | |
911 | r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec)); | |
912 | if (r < 0) | |
913 | goto fail; | |
914 | ||
915 | mount_set_state(m, state); | |
916 | } else if (state == MOUNT_REMOUNTING_SIGTERM && m->kill_context.send_sigkill) | |
917 | mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS); | |
918 | else if (IN_SET(state, MOUNT_REMOUNTING_SIGTERM, MOUNT_REMOUNTING_SIGKILL)) | |
919 | mount_enter_mounted(m, MOUNT_SUCCESS); | |
920 | else if (state == MOUNT_UNMOUNTING_SIGTERM && m->kill_context.send_sigkill) | |
921 | mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS); | |
922 | else | |
923 | mount_enter_dead_or_mounted(m, MOUNT_SUCCESS); | |
924 | ||
925 | return; | |
926 | ||
927 | fail: | |
928 | log_unit_warning_errno(UNIT(m), r, "Failed to kill processes: %m"); | |
929 | mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES); | |
930 | } | |
931 | ||
932 | static void mount_enter_unmounting(Mount *m) { | |
933 | int r; | |
934 | ||
935 | assert(m); | |
936 | ||
937 | /* Start counting our attempts */ | |
938 | if (!IN_SET(m->state, | |
939 | MOUNT_UNMOUNTING, | |
940 | MOUNT_UNMOUNTING_SIGTERM, | |
941 | MOUNT_UNMOUNTING_SIGKILL)) | |
942 | m->n_retry_umount = 0; | |
943 | ||
944 | m->control_command_id = MOUNT_EXEC_UNMOUNT; | |
945 | m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT; | |
946 | ||
947 | r = exec_command_set(m->control_command, UMOUNT_PATH, m->where, "-c", NULL); | |
948 | if (r >= 0 && m->lazy_unmount) | |
949 | r = exec_command_append(m->control_command, "-l", NULL); | |
950 | if (r >= 0 && m->force_unmount) | |
951 | r = exec_command_append(m->control_command, "-f", NULL); | |
952 | if (r < 0) | |
953 | goto fail; | |
954 | ||
955 | mount_unwatch_control_pid(m); | |
956 | ||
957 | r = mount_spawn(m, m->control_command, &m->control_pid); | |
958 | if (r < 0) | |
959 | goto fail; | |
960 | ||
961 | mount_set_state(m, MOUNT_UNMOUNTING); | |
962 | ||
963 | return; | |
964 | ||
965 | fail: | |
966 | log_unit_warning_errno(UNIT(m), r, "Failed to run 'umount' task: %m"); | |
967 | mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES); | |
968 | } | |
969 | ||
970 | static void mount_enter_mounting(Mount *m) { | |
971 | int r; | |
972 | MountParameters *p; | |
973 | ||
974 | assert(m); | |
975 | ||
976 | r = unit_fail_if_noncanonical(UNIT(m), m->where); | |
977 | if (r < 0) | |
978 | goto fail; | |
979 | ||
980 | (void) mkdir_p_label(m->where, m->directory_mode); | |
981 | ||
982 | unit_warn_if_dir_nonempty(UNIT(m), m->where); | |
983 | unit_warn_leftover_processes(UNIT(m)); | |
984 | ||
985 | m->control_command_id = MOUNT_EXEC_MOUNT; | |
986 | m->control_command = m->exec_command + MOUNT_EXEC_MOUNT; | |
987 | ||
988 | /* Create the source directory for bind-mounts if needed */ | |
989 | p = get_mount_parameters_fragment(m); | |
990 | if (p && mount_is_bind(p)) | |
991 | (void) mkdir_p_label(p->what, m->directory_mode); | |
992 | ||
993 | if (p) { | |
994 | _cleanup_free_ char *opts = NULL; | |
995 | ||
996 | r = fstab_filter_options(p->options, "nofail\0" "noauto\0" "auto\0", NULL, NULL, &opts); | |
997 | if (r < 0) | |
998 | goto fail; | |
999 | ||
1000 | r = exec_command_set(m->control_command, MOUNT_PATH, p->what, m->where, NULL); | |
1001 | if (r >= 0 && m->sloppy_options) | |
1002 | r = exec_command_append(m->control_command, "-s", NULL); | |
1003 | if (r >= 0 && p->fstype) | |
1004 | r = exec_command_append(m->control_command, "-t", p->fstype, NULL); | |
1005 | if (r >= 0 && !isempty(opts)) | |
1006 | r = exec_command_append(m->control_command, "-o", opts, NULL); | |
1007 | } else | |
1008 | r = -ENOENT; | |
1009 | if (r < 0) | |
1010 | goto fail; | |
1011 | ||
1012 | mount_unwatch_control_pid(m); | |
1013 | ||
1014 | r = mount_spawn(m, m->control_command, &m->control_pid); | |
1015 | if (r < 0) | |
1016 | goto fail; | |
1017 | ||
1018 | mount_set_state(m, MOUNT_MOUNTING); | |
1019 | ||
1020 | return; | |
1021 | ||
1022 | fail: | |
1023 | log_unit_warning_errno(UNIT(m), r, "Failed to run 'mount' task: %m"); | |
1024 | mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES); | |
1025 | } | |
1026 | ||
1027 | static void mount_set_reload_result(Mount *m, MountResult result) { | |
1028 | assert(m); | |
1029 | ||
1030 | /* Only store the first error we encounter */ | |
1031 | if (m->reload_result != MOUNT_SUCCESS) | |
1032 | return; | |
1033 | ||
1034 | m->reload_result = result; | |
1035 | } | |
1036 | ||
1037 | static void mount_enter_remounting(Mount *m) { | |
1038 | int r; | |
1039 | MountParameters *p; | |
1040 | ||
1041 | assert(m); | |
1042 | ||
1043 | /* Reset reload result when we are about to start a new remount operation */ | |
1044 | m->reload_result = MOUNT_SUCCESS; | |
1045 | ||
1046 | m->control_command_id = MOUNT_EXEC_REMOUNT; | |
1047 | m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT; | |
1048 | ||
1049 | p = get_mount_parameters_fragment(m); | |
1050 | if (p) { | |
1051 | const char *o; | |
1052 | ||
1053 | if (p->options) | |
1054 | o = strjoina("remount,", p->options); | |
1055 | else | |
1056 | o = "remount"; | |
1057 | ||
1058 | r = exec_command_set(m->control_command, MOUNT_PATH, | |
1059 | p->what, m->where, | |
1060 | "-o", o, NULL); | |
1061 | if (r >= 0 && m->sloppy_options) | |
1062 | r = exec_command_append(m->control_command, "-s", NULL); | |
1063 | if (r >= 0 && p->fstype) | |
1064 | r = exec_command_append(m->control_command, "-t", p->fstype, NULL); | |
1065 | } else | |
1066 | r = -ENOENT; | |
1067 | if (r < 0) | |
1068 | goto fail; | |
1069 | ||
1070 | mount_unwatch_control_pid(m); | |
1071 | ||
1072 | r = mount_spawn(m, m->control_command, &m->control_pid); | |
1073 | if (r < 0) | |
1074 | goto fail; | |
1075 | ||
1076 | mount_set_state(m, MOUNT_REMOUNTING); | |
1077 | ||
1078 | return; | |
1079 | ||
1080 | fail: | |
1081 | log_unit_warning_errno(UNIT(m), r, "Failed to run 'remount' task: %m"); | |
1082 | mount_set_reload_result(m, MOUNT_FAILURE_RESOURCES); | |
1083 | mount_enter_dead_or_mounted(m, MOUNT_SUCCESS); | |
1084 | } | |
1085 | ||
1086 | static void mount_cycle_clear(Mount *m) { | |
1087 | assert(m); | |
1088 | ||
1089 | /* Clear all state we shall forget for this new cycle */ | |
1090 | ||
1091 | m->result = MOUNT_SUCCESS; | |
1092 | m->reload_result = MOUNT_SUCCESS; | |
1093 | exec_command_reset_status_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX); | |
1094 | UNIT(m)->reset_accounting = true; | |
1095 | } | |
1096 | ||
1097 | static int mount_start(Unit *u) { | |
1098 | Mount *m = MOUNT(u); | |
1099 | int r; | |
1100 | ||
1101 | assert(m); | |
1102 | ||
1103 | /* We cannot fulfill this request right now, try again later | |
1104 | * please! */ | |
1105 | if (IN_SET(m->state, | |
1106 | MOUNT_UNMOUNTING, | |
1107 | MOUNT_UNMOUNTING_SIGTERM, | |
1108 | MOUNT_UNMOUNTING_SIGKILL, | |
1109 | MOUNT_CLEANING)) | |
1110 | return -EAGAIN; | |
1111 | ||
1112 | /* Already on it! */ | |
1113 | if (m->state == MOUNT_MOUNTING) | |
1114 | return 0; | |
1115 | ||
1116 | assert(IN_SET(m->state, MOUNT_DEAD, MOUNT_FAILED)); | |
1117 | ||
1118 | r = unit_test_start_limit(u); | |
1119 | if (r < 0) { | |
1120 | mount_enter_dead(m, MOUNT_FAILURE_START_LIMIT_HIT); | |
1121 | return r; | |
1122 | } | |
1123 | ||
1124 | r = unit_acquire_invocation_id(u); | |
1125 | if (r < 0) | |
1126 | return r; | |
1127 | ||
1128 | mount_cycle_clear(m); | |
1129 | mount_enter_mounting(m); | |
1130 | ||
1131 | return 1; | |
1132 | } | |
1133 | ||
1134 | static int mount_stop(Unit *u) { | |
1135 | Mount *m = MOUNT(u); | |
1136 | ||
1137 | assert(m); | |
1138 | ||
1139 | switch (m->state) { | |
1140 | ||
1141 | case MOUNT_UNMOUNTING: | |
1142 | case MOUNT_UNMOUNTING_SIGKILL: | |
1143 | case MOUNT_UNMOUNTING_SIGTERM: | |
1144 | /* Already on it */ | |
1145 | return 0; | |
1146 | ||
1147 | case MOUNT_MOUNTING: | |
1148 | case MOUNT_MOUNTING_DONE: | |
1149 | case MOUNT_REMOUNTING: | |
1150 | /* If we are still waiting for /bin/mount, we go directly into kill mode. */ | |
1151 | mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_SUCCESS); | |
1152 | return 0; | |
1153 | ||
1154 | case MOUNT_REMOUNTING_SIGTERM: | |
1155 | /* If we are already waiting for a hung remount, convert this to the matching unmounting state */ | |
1156 | mount_set_state(m, MOUNT_UNMOUNTING_SIGTERM); | |
1157 | return 0; | |
1158 | ||
1159 | case MOUNT_REMOUNTING_SIGKILL: | |
1160 | /* as above */ | |
1161 | mount_set_state(m, MOUNT_UNMOUNTING_SIGKILL); | |
1162 | return 0; | |
1163 | ||
1164 | case MOUNT_MOUNTED: | |
1165 | mount_enter_unmounting(m); | |
1166 | return 1; | |
1167 | ||
1168 | case MOUNT_CLEANING: | |
1169 | /* If we are currently cleaning, then abort it, brutally. */ | |
1170 | mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS); | |
1171 | return 0; | |
1172 | ||
1173 | default: | |
1174 | assert_not_reached("Unexpected state."); | |
1175 | } | |
1176 | } | |
1177 | ||
1178 | static int mount_reload(Unit *u) { | |
1179 | Mount *m = MOUNT(u); | |
1180 | ||
1181 | assert(m); | |
1182 | assert(m->state == MOUNT_MOUNTED); | |
1183 | ||
1184 | mount_enter_remounting(m); | |
1185 | ||
1186 | return 1; | |
1187 | } | |
1188 | ||
1189 | static int mount_serialize(Unit *u, FILE *f, FDSet *fds) { | |
1190 | Mount *m = MOUNT(u); | |
1191 | ||
1192 | assert(m); | |
1193 | assert(f); | |
1194 | assert(fds); | |
1195 | ||
1196 | (void) serialize_item(f, "state", mount_state_to_string(m->state)); | |
1197 | (void) serialize_item(f, "result", mount_result_to_string(m->result)); | |
1198 | (void) serialize_item(f, "reload-result", mount_result_to_string(m->reload_result)); | |
1199 | (void) serialize_item_format(f, "n-retry-umount", "%u", m->n_retry_umount); | |
1200 | ||
1201 | if (m->control_pid > 0) | |
1202 | (void) serialize_item_format(f, "control-pid", PID_FMT, m->control_pid); | |
1203 | ||
1204 | if (m->control_command_id >= 0) | |
1205 | (void) serialize_item(f, "control-command", mount_exec_command_to_string(m->control_command_id)); | |
1206 | ||
1207 | return 0; | |
1208 | } | |
1209 | ||
1210 | static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
1211 | Mount *m = MOUNT(u); | |
1212 | int r; | |
1213 | ||
1214 | assert(u); | |
1215 | assert(key); | |
1216 | assert(value); | |
1217 | assert(fds); | |
1218 | ||
1219 | if (streq(key, "state")) { | |
1220 | MountState state; | |
1221 | ||
1222 | if ((state = mount_state_from_string(value)) < 0) | |
1223 | log_unit_debug(u, "Failed to parse state value: %s", value); | |
1224 | else | |
1225 | m->deserialized_state = state; | |
1226 | ||
1227 | } else if (streq(key, "result")) { | |
1228 | MountResult f; | |
1229 | ||
1230 | f = mount_result_from_string(value); | |
1231 | if (f < 0) | |
1232 | log_unit_debug(u, "Failed to parse result value: %s", value); | |
1233 | else if (f != MOUNT_SUCCESS) | |
1234 | m->result = f; | |
1235 | ||
1236 | } else if (streq(key, "reload-result")) { | |
1237 | MountResult f; | |
1238 | ||
1239 | f = mount_result_from_string(value); | |
1240 | if (f < 0) | |
1241 | log_unit_debug(u, "Failed to parse reload result value: %s", value); | |
1242 | else if (f != MOUNT_SUCCESS) | |
1243 | m->reload_result = f; | |
1244 | ||
1245 | } else if (streq(key, "n-retry-umount")) { | |
1246 | ||
1247 | r = safe_atou(value, &m->n_retry_umount); | |
1248 | if (r < 0) | |
1249 | log_unit_debug(u, "Failed to parse n-retry-umount value: %s", value); | |
1250 | ||
1251 | } else if (streq(key, "control-pid")) { | |
1252 | ||
1253 | if (parse_pid(value, &m->control_pid) < 0) | |
1254 | log_unit_debug(u, "Failed to parse control-pid value: %s", value); | |
1255 | ||
1256 | } else if (streq(key, "control-command")) { | |
1257 | MountExecCommand id; | |
1258 | ||
1259 | id = mount_exec_command_from_string(value); | |
1260 | if (id < 0) | |
1261 | log_unit_debug(u, "Failed to parse exec-command value: %s", value); | |
1262 | else { | |
1263 | m->control_command_id = id; | |
1264 | m->control_command = m->exec_command + id; | |
1265 | } | |
1266 | } else | |
1267 | log_unit_debug(u, "Unknown serialization key: %s", key); | |
1268 | ||
1269 | return 0; | |
1270 | } | |
1271 | ||
1272 | _pure_ static UnitActiveState mount_active_state(Unit *u) { | |
1273 | assert(u); | |
1274 | ||
1275 | return state_translation_table[MOUNT(u)->state]; | |
1276 | } | |
1277 | ||
1278 | _pure_ static const char *mount_sub_state_to_string(Unit *u) { | |
1279 | assert(u); | |
1280 | ||
1281 | return mount_state_to_string(MOUNT(u)->state); | |
1282 | } | |
1283 | ||
1284 | _pure_ static bool mount_may_gc(Unit *u) { | |
1285 | Mount *m = MOUNT(u); | |
1286 | ||
1287 | assert(m); | |
1288 | ||
1289 | if (m->from_proc_self_mountinfo) | |
1290 | return false; | |
1291 | ||
1292 | return true; | |
1293 | } | |
1294 | ||
1295 | static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) { | |
1296 | Mount *m = MOUNT(u); | |
1297 | MountResult f; | |
1298 | ||
1299 | assert(m); | |
1300 | assert(pid >= 0); | |
1301 | ||
1302 | if (pid != m->control_pid) | |
1303 | return; | |
1304 | ||
1305 | /* So here's the thing, we really want to know before /usr/bin/mount or /usr/bin/umount exit whether | |
1306 | * they established/remove a mount. This is important when mounting, but even more so when unmounting | |
1307 | * since we need to deal with nested mounts and otherwise cannot safely determine whether to repeat | |
1308 | * the unmounts. In theory, the kernel fires /proc/self/mountinfo changes off before returning from | |
1309 | * the mount() or umount() syscalls, and thus we should see the changes to the proc file before we | |
1310 | * process the waitid() for the /usr/bin/(u)mount processes. However, this is unfortunately racy: we | |
1311 | * have to waitid() for processes using P_ALL (since we need to reap unexpected children that got | |
1312 | * reparented to PID 1), but when using P_ALL we might end up reaping processes that terminated just | |
1313 | * instants ago, i.e. already after our last event loop iteration (i.e. after the last point we might | |
1314 | * have noticed /proc/self/mountinfo events via epoll). This means event loop priorities for | |
1315 | * processing SIGCHLD vs. /proc/self/mountinfo IO events are not as relevant as we want. To fix that | |
1316 | * race, let's explicitly scan /proc/self/mountinfo before we start processing /usr/bin/(u)mount | |
1317 | * dying. It's ugly, but it makes our ordering systematic again, and makes sure we always see | |
1318 | * /proc/self/mountinfo changes before our mount/umount exits. */ | |
1319 | (void) mount_process_proc_self_mountinfo(u->manager); | |
1320 | ||
1321 | m->control_pid = 0; | |
1322 | ||
1323 | if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL)) | |
1324 | f = MOUNT_SUCCESS; | |
1325 | else if (code == CLD_EXITED) | |
1326 | f = MOUNT_FAILURE_EXIT_CODE; | |
1327 | else if (code == CLD_KILLED) | |
1328 | f = MOUNT_FAILURE_SIGNAL; | |
1329 | else if (code == CLD_DUMPED) | |
1330 | f = MOUNT_FAILURE_CORE_DUMP; | |
1331 | else | |
1332 | assert_not_reached("Unknown code"); | |
1333 | ||
1334 | if (IN_SET(m->state, MOUNT_REMOUNTING, MOUNT_REMOUNTING_SIGKILL, MOUNT_REMOUNTING_SIGTERM)) | |
1335 | mount_set_reload_result(m, f); | |
1336 | else if (m->result == MOUNT_SUCCESS) | |
1337 | m->result = f; | |
1338 | ||
1339 | if (m->control_command) { | |
1340 | exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status); | |
1341 | ||
1342 | m->control_command = NULL; | |
1343 | m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; | |
1344 | } | |
1345 | ||
1346 | unit_log_process_exit( | |
1347 | u, | |
1348 | "Mount process", | |
1349 | mount_exec_command_to_string(m->control_command_id), | |
1350 | f == MOUNT_SUCCESS, | |
1351 | code, status); | |
1352 | ||
1353 | /* Note that due to the io event priority logic, we can be sure the new mountinfo is loaded | |
1354 | * before we process the SIGCHLD for the mount command. */ | |
1355 | ||
1356 | switch (m->state) { | |
1357 | ||
1358 | case MOUNT_MOUNTING: | |
1359 | /* Our mount point has not appeared in mountinfo. Something went wrong. */ | |
1360 | ||
1361 | if (f == MOUNT_SUCCESS) { | |
1362 | /* Either /bin/mount has an unexpected definition of success, | |
1363 | * or someone raced us and we lost. */ | |
1364 | log_unit_warning(UNIT(m), "Mount process finished, but there is no mount."); | |
1365 | f = MOUNT_FAILURE_PROTOCOL; | |
1366 | } | |
1367 | mount_enter_dead(m, f); | |
1368 | break; | |
1369 | ||
1370 | case MOUNT_MOUNTING_DONE: | |
1371 | mount_enter_mounted(m, f); | |
1372 | break; | |
1373 | ||
1374 | case MOUNT_REMOUNTING: | |
1375 | case MOUNT_REMOUNTING_SIGTERM: | |
1376 | case MOUNT_REMOUNTING_SIGKILL: | |
1377 | mount_enter_dead_or_mounted(m, MOUNT_SUCCESS); | |
1378 | break; | |
1379 | ||
1380 | case MOUNT_UNMOUNTING: | |
1381 | ||
1382 | if (f == MOUNT_SUCCESS && m->from_proc_self_mountinfo) { | |
1383 | ||
1384 | /* Still a mount point? If so, let's try again. Most likely there were multiple mount points | |
1385 | * stacked on top of each other. We might exceed the timeout specified by the user overall, | |
1386 | * but we will stop as soon as any one umount times out. */ | |
1387 | ||
1388 | if (m->n_retry_umount < RETRY_UMOUNT_MAX) { | |
1389 | log_unit_debug(u, "Mount still present, trying again."); | |
1390 | m->n_retry_umount++; | |
1391 | mount_enter_unmounting(m); | |
1392 | } else { | |
1393 | log_unit_warning(u, "Mount still present after %u attempts to unmount, giving up.", m->n_retry_umount); | |
1394 | mount_enter_mounted(m, f); | |
1395 | } | |
1396 | } else | |
1397 | mount_enter_dead_or_mounted(m, f); | |
1398 | ||
1399 | break; | |
1400 | ||
1401 | case MOUNT_UNMOUNTING_SIGKILL: | |
1402 | case MOUNT_UNMOUNTING_SIGTERM: | |
1403 | mount_enter_dead_or_mounted(m, f); | |
1404 | break; | |
1405 | ||
1406 | case MOUNT_CLEANING: | |
1407 | if (m->clean_result == MOUNT_SUCCESS) | |
1408 | m->clean_result = f; | |
1409 | ||
1410 | mount_enter_dead(m, MOUNT_SUCCESS); | |
1411 | break; | |
1412 | ||
1413 | default: | |
1414 | assert_not_reached("Uh, control process died at wrong time."); | |
1415 | } | |
1416 | ||
1417 | /* Notify clients about changed exit status */ | |
1418 | unit_add_to_dbus_queue(u); | |
1419 | } | |
1420 | ||
1421 | static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) { | |
1422 | Mount *m = MOUNT(userdata); | |
1423 | ||
1424 | assert(m); | |
1425 | assert(m->timer_event_source == source); | |
1426 | ||
1427 | switch (m->state) { | |
1428 | ||
1429 | case MOUNT_MOUNTING: | |
1430 | case MOUNT_MOUNTING_DONE: | |
1431 | log_unit_warning(UNIT(m), "Mounting timed out. Terminating."); | |
1432 | mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT); | |
1433 | break; | |
1434 | ||
1435 | case MOUNT_REMOUNTING: | |
1436 | log_unit_warning(UNIT(m), "Remounting timed out. Terminating remount process."); | |
1437 | mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT); | |
1438 | mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, MOUNT_SUCCESS); | |
1439 | break; | |
1440 | ||
1441 | case MOUNT_REMOUNTING_SIGTERM: | |
1442 | mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT); | |
1443 | ||
1444 | if (m->kill_context.send_sigkill) { | |
1445 | log_unit_warning(UNIT(m), "Remounting timed out. Killing."); | |
1446 | mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS); | |
1447 | } else { | |
1448 | log_unit_warning(UNIT(m), "Remounting timed out. Skipping SIGKILL. Ignoring."); | |
1449 | mount_enter_dead_or_mounted(m, MOUNT_SUCCESS); | |
1450 | } | |
1451 | break; | |
1452 | ||
1453 | case MOUNT_REMOUNTING_SIGKILL: | |
1454 | mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT); | |
1455 | ||
1456 | log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring."); | |
1457 | mount_enter_dead_or_mounted(m, MOUNT_SUCCESS); | |
1458 | break; | |
1459 | ||
1460 | case MOUNT_UNMOUNTING: | |
1461 | log_unit_warning(UNIT(m), "Unmounting timed out. Terminating."); | |
1462 | mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT); | |
1463 | break; | |
1464 | ||
1465 | case MOUNT_UNMOUNTING_SIGTERM: | |
1466 | if (m->kill_context.send_sigkill) { | |
1467 | log_unit_warning(UNIT(m), "Mount process timed out. Killing."); | |
1468 | mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT); | |
1469 | } else { | |
1470 | log_unit_warning(UNIT(m), "Mount process timed out. Skipping SIGKILL. Ignoring."); | |
1471 | mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT); | |
1472 | } | |
1473 | break; | |
1474 | ||
1475 | case MOUNT_UNMOUNTING_SIGKILL: | |
1476 | log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring."); | |
1477 | mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT); | |
1478 | break; | |
1479 | ||
1480 | case MOUNT_CLEANING: | |
1481 | log_unit_warning(UNIT(m), "Cleaning timed out. killing."); | |
1482 | ||
1483 | if (m->clean_result == MOUNT_SUCCESS) | |
1484 | m->clean_result = MOUNT_FAILURE_TIMEOUT; | |
1485 | ||
1486 | mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, 0); | |
1487 | break; | |
1488 | ||
1489 | default: | |
1490 | assert_not_reached("Timeout at wrong time."); | |
1491 | } | |
1492 | ||
1493 | return 0; | |
1494 | } | |
1495 | ||
1496 | static int mount_setup_new_unit( | |
1497 | Manager *m, | |
1498 | const char *name, | |
1499 | const char *what, | |
1500 | const char *where, | |
1501 | const char *options, | |
1502 | const char *fstype, | |
1503 | MountProcFlags *ret_flags, | |
1504 | Unit **ret) { | |
1505 | ||
1506 | _cleanup_(unit_freep) Unit *u = NULL; | |
1507 | int r; | |
1508 | ||
1509 | assert(m); | |
1510 | assert(name); | |
1511 | assert(ret_flags); | |
1512 | assert(ret); | |
1513 | ||
1514 | r = unit_new_for_name(m, sizeof(Mount), name, &u); | |
1515 | if (r < 0) | |
1516 | return r; | |
1517 | ||
1518 | r = free_and_strdup(&u->source_path, "/proc/self/mountinfo"); | |
1519 | if (r < 0) | |
1520 | return r; | |
1521 | ||
1522 | r = free_and_strdup(&MOUNT(u)->where, where); | |
1523 | if (r < 0) | |
1524 | return r; | |
1525 | ||
1526 | r = update_parameters_proc_self_mountinfo(MOUNT(u), what, options, fstype); | |
1527 | if (r < 0) | |
1528 | return r; | |
1529 | ||
1530 | /* This unit was generated because /proc/self/mountinfo reported it. Remember this, so that by the time we load | |
1531 | * the unit file for it (and thus add in extra deps right after) we know what source to attributes the deps | |
1532 | * to.*/ | |
1533 | MOUNT(u)->from_proc_self_mountinfo = true; | |
1534 | ||
1535 | /* We have only allocated the stub now, let's enqueue this unit for loading now, so that everything else is | |
1536 | * loaded in now. */ | |
1537 | unit_add_to_load_queue(u); | |
1538 | ||
1539 | *ret_flags = MOUNT_PROC_IS_MOUNTED | MOUNT_PROC_JUST_MOUNTED | MOUNT_PROC_JUST_CHANGED; | |
1540 | *ret = TAKE_PTR(u); | |
1541 | return 0; | |
1542 | } | |
1543 | ||
1544 | static int mount_setup_existing_unit( | |
1545 | Unit *u, | |
1546 | const char *what, | |
1547 | const char *where, | |
1548 | const char *options, | |
1549 | const char *fstype, | |
1550 | MountProcFlags *ret_flags) { | |
1551 | ||
1552 | int r; | |
1553 | ||
1554 | assert(u); | |
1555 | assert(ret_flags); | |
1556 | ||
1557 | if (!MOUNT(u)->where) { | |
1558 | MOUNT(u)->where = strdup(where); | |
1559 | if (!MOUNT(u)->where) | |
1560 | return -ENOMEM; | |
1561 | } | |
1562 | ||
1563 | /* In case we have multiple mounts established on the same mount point, let's merge flags set already | |
1564 | * for the current unit. Note that the flags field is reset on each iteration of reading | |
1565 | * /proc/self/mountinfo, hence we know for sure anything already set here is from the current | |
1566 | * iteration and thus worthy of taking into account. */ | |
1567 | MountProcFlags flags = | |
1568 | MOUNT(u)->proc_flags | MOUNT_PROC_IS_MOUNTED; | |
1569 | ||
1570 | r = update_parameters_proc_self_mountinfo(MOUNT(u), what, options, fstype); | |
1571 | if (r < 0) | |
1572 | return r; | |
1573 | if (r > 0) | |
1574 | flags |= MOUNT_PROC_JUST_CHANGED; | |
1575 | ||
1576 | /* There are two conditions when we consider a mount point just mounted: when we haven't seen it in | |
1577 | * /proc/self/mountinfo before or when MOUNT_MOUNTING is our current state. Why bother with the | |
1578 | * latter? Shouldn't that be covered by the former? No, during reload it is not because we might then | |
1579 | * encounter a new /proc/self/mountinfo in combination with an old mount unit state (since it stems | |
1580 | * from the serialized state), and need to catch up. Since we know that the MOUNT_MOUNTING state is | |
1581 | * reached when we wait for the mount to appear we hence can assume that if we are in it, we are | |
1582 | * actually seeing it established for the first time. */ | |
1583 | if (!MOUNT(u)->from_proc_self_mountinfo || MOUNT(u)->state == MOUNT_MOUNTING) | |
1584 | flags |= MOUNT_PROC_JUST_MOUNTED; | |
1585 | ||
1586 | MOUNT(u)->from_proc_self_mountinfo = true; | |
1587 | ||
1588 | if (IN_SET(u->load_state, UNIT_NOT_FOUND, UNIT_BAD_SETTING, UNIT_ERROR)) { | |
1589 | /* The unit was previously not found or otherwise not loaded. Now that the unit shows up in | |
1590 | * /proc/self/mountinfo we should reconsider it this, hence set it to UNIT_LOADED. */ | |
1591 | u->load_state = UNIT_LOADED; | |
1592 | u->load_error = 0; | |
1593 | ||
1594 | flags |= MOUNT_PROC_JUST_CHANGED; | |
1595 | } | |
1596 | ||
1597 | if (FLAGS_SET(flags, MOUNT_PROC_JUST_CHANGED)) { | |
1598 | /* If things changed, then make sure that all deps are regenerated. Let's | |
1599 | * first remove all automatic deps, and then add in the new ones. */ | |
1600 | ||
1601 | unit_remove_dependencies(u, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT); | |
1602 | ||
1603 | r = mount_add_non_exec_dependencies(MOUNT(u)); | |
1604 | if (r < 0) | |
1605 | return r; | |
1606 | } | |
1607 | ||
1608 | *ret_flags = flags; | |
1609 | return 0; | |
1610 | } | |
1611 | ||
1612 | static int mount_setup_unit( | |
1613 | Manager *m, | |
1614 | const char *what, | |
1615 | const char *where, | |
1616 | const char *options, | |
1617 | const char *fstype, | |
1618 | bool set_flags) { | |
1619 | ||
1620 | _cleanup_free_ char *e = NULL; | |
1621 | MountProcFlags flags; | |
1622 | Unit *u; | |
1623 | int r; | |
1624 | ||
1625 | assert(m); | |
1626 | assert(what); | |
1627 | assert(where); | |
1628 | assert(options); | |
1629 | assert(fstype); | |
1630 | ||
1631 | /* Ignore API mount points. They should never be referenced in | |
1632 | * dependencies ever. */ | |
1633 | if (mount_point_is_api(where) || mount_point_ignore(where)) | |
1634 | return 0; | |
1635 | ||
1636 | if (streq(fstype, "autofs")) | |
1637 | return 0; | |
1638 | ||
1639 | /* probably some kind of swap, ignore */ | |
1640 | if (!is_path(where)) | |
1641 | return 0; | |
1642 | ||
1643 | r = unit_name_from_path(where, ".mount", &e); | |
1644 | if (r < 0) | |
1645 | return log_error_errno(r, "Failed to generate unit name from path '%s': %m", where); | |
1646 | ||
1647 | u = manager_get_unit(m, e); | |
1648 | if (u) | |
1649 | r = mount_setup_existing_unit(u, what, where, options, fstype, &flags); | |
1650 | else | |
1651 | /* First time we see this mount point meaning that it's not been initiated by a mount unit but rather | |
1652 | * by the sysadmin having called mount(8) directly. */ | |
1653 | r = mount_setup_new_unit(m, e, what, where, options, fstype, &flags, &u); | |
1654 | if (r < 0) | |
1655 | return log_warning_errno(r, "Failed to set up mount unit: %m"); | |
1656 | ||
1657 | /* If the mount changed properties or state, let's notify our clients */ | |
1658 | if (flags & (MOUNT_PROC_JUST_CHANGED|MOUNT_PROC_JUST_MOUNTED)) | |
1659 | unit_add_to_dbus_queue(u); | |
1660 | ||
1661 | if (set_flags) | |
1662 | MOUNT(u)->proc_flags = flags; | |
1663 | ||
1664 | return 0; | |
1665 | } | |
1666 | ||
1667 | static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) { | |
1668 | _cleanup_(mnt_free_tablep) struct libmnt_table *table = NULL; | |
1669 | _cleanup_(mnt_free_iterp) struct libmnt_iter *iter = NULL; | |
1670 | int r; | |
1671 | ||
1672 | assert(m); | |
1673 | ||
1674 | r = libmount_parse(NULL, NULL, &table, &iter); | |
1675 | if (r < 0) | |
1676 | return log_error_errno(r, "Failed to parse /proc/self/mountinfo: %m"); | |
1677 | ||
1678 | for (;;) { | |
1679 | struct libmnt_fs *fs; | |
1680 | const char *device, *path, *options, *fstype; | |
1681 | ||
1682 | r = mnt_table_next_fs(table, iter, &fs); | |
1683 | if (r == 1) | |
1684 | break; | |
1685 | if (r < 0) | |
1686 | return log_error_errno(r, "Failed to get next entry from /proc/self/mountinfo: %m"); | |
1687 | ||
1688 | device = mnt_fs_get_source(fs); | |
1689 | path = mnt_fs_get_target(fs); | |
1690 | options = mnt_fs_get_options(fs); | |
1691 | fstype = mnt_fs_get_fstype(fs); | |
1692 | ||
1693 | if (!device || !path) | |
1694 | continue; | |
1695 | ||
1696 | device_found_node(m, device, DEVICE_FOUND_MOUNT, DEVICE_FOUND_MOUNT); | |
1697 | ||
1698 | (void) mount_setup_unit(m, device, path, options, fstype, set_flags); | |
1699 | } | |
1700 | ||
1701 | return 0; | |
1702 | } | |
1703 | ||
1704 | static void mount_shutdown(Manager *m) { | |
1705 | assert(m); | |
1706 | ||
1707 | m->mount_event_source = sd_event_source_unref(m->mount_event_source); | |
1708 | ||
1709 | mnt_unref_monitor(m->mount_monitor); | |
1710 | m->mount_monitor = NULL; | |
1711 | } | |
1712 | ||
1713 | static int mount_get_timeout(Unit *u, usec_t *timeout) { | |
1714 | Mount *m = MOUNT(u); | |
1715 | usec_t t; | |
1716 | int r; | |
1717 | ||
1718 | if (!m->timer_event_source) | |
1719 | return 0; | |
1720 | ||
1721 | r = sd_event_source_get_time(m->timer_event_source, &t); | |
1722 | if (r < 0) | |
1723 | return r; | |
1724 | if (t == USEC_INFINITY) | |
1725 | return 0; | |
1726 | ||
1727 | *timeout = t; | |
1728 | return 1; | |
1729 | } | |
1730 | ||
1731 | static void mount_enumerate_perpetual(Manager *m) { | |
1732 | Unit *u; | |
1733 | int r; | |
1734 | ||
1735 | assert(m); | |
1736 | ||
1737 | /* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's | |
1738 | * unconditionally synthesize it here and mark it as perpetual. */ | |
1739 | ||
1740 | u = manager_get_unit(m, SPECIAL_ROOT_MOUNT); | |
1741 | if (!u) { | |
1742 | r = unit_new_for_name(m, sizeof(Mount), SPECIAL_ROOT_MOUNT, &u); | |
1743 | if (r < 0) { | |
1744 | log_error_errno(r, "Failed to allocate the special " SPECIAL_ROOT_MOUNT " unit: %m"); | |
1745 | return; | |
1746 | } | |
1747 | } | |
1748 | ||
1749 | u->perpetual = true; | |
1750 | MOUNT(u)->deserialized_state = MOUNT_MOUNTED; | |
1751 | ||
1752 | unit_add_to_load_queue(u); | |
1753 | unit_add_to_dbus_queue(u); | |
1754 | } | |
1755 | ||
1756 | static bool mount_is_mounted(Mount *m) { | |
1757 | assert(m); | |
1758 | ||
1759 | return UNIT(m)->perpetual || FLAGS_SET(m->proc_flags, MOUNT_PROC_IS_MOUNTED); | |
1760 | } | |
1761 | ||
1762 | static void mount_enumerate(Manager *m) { | |
1763 | int r; | |
1764 | ||
1765 | assert(m); | |
1766 | ||
1767 | mnt_init_debug(0); | |
1768 | ||
1769 | if (!m->mount_monitor) { | |
1770 | int fd; | |
1771 | ||
1772 | m->mount_monitor = mnt_new_monitor(); | |
1773 | if (!m->mount_monitor) { | |
1774 | log_oom(); | |
1775 | goto fail; | |
1776 | } | |
1777 | ||
1778 | r = mnt_monitor_enable_kernel(m->mount_monitor, 1); | |
1779 | if (r < 0) { | |
1780 | log_error_errno(r, "Failed to enable watching of kernel mount events: %m"); | |
1781 | goto fail; | |
1782 | } | |
1783 | ||
1784 | r = mnt_monitor_enable_userspace(m->mount_monitor, 1, NULL); | |
1785 | if (r < 0) { | |
1786 | log_error_errno(r, "Failed to enable watching of userspace mount events: %m"); | |
1787 | goto fail; | |
1788 | } | |
1789 | ||
1790 | /* mnt_unref_monitor() will close the fd */ | |
1791 | fd = r = mnt_monitor_get_fd(m->mount_monitor); | |
1792 | if (r < 0) { | |
1793 | log_error_errno(r, "Failed to acquire watch file descriptor: %m"); | |
1794 | goto fail; | |
1795 | } | |
1796 | ||
1797 | r = sd_event_add_io(m->event, &m->mount_event_source, fd, EPOLLIN, mount_dispatch_io, m); | |
1798 | if (r < 0) { | |
1799 | log_error_errno(r, "Failed to watch mount file descriptor: %m"); | |
1800 | goto fail; | |
1801 | } | |
1802 | ||
1803 | r = sd_event_source_set_priority(m->mount_event_source, SD_EVENT_PRIORITY_NORMAL-10); | |
1804 | if (r < 0) { | |
1805 | log_error_errno(r, "Failed to adjust mount watch priority: %m"); | |
1806 | goto fail; | |
1807 | } | |
1808 | ||
1809 | (void) sd_event_source_set_description(m->mount_event_source, "mount-monitor-dispatch"); | |
1810 | } | |
1811 | ||
1812 | r = mount_load_proc_self_mountinfo(m, false); | |
1813 | if (r < 0) | |
1814 | goto fail; | |
1815 | ||
1816 | return; | |
1817 | ||
1818 | fail: | |
1819 | mount_shutdown(m); | |
1820 | } | |
1821 | ||
1822 | static int drain_libmount(Manager *m) { | |
1823 | bool rescan = false; | |
1824 | int r; | |
1825 | ||
1826 | assert(m); | |
1827 | ||
1828 | /* Drain all events and verify that the event is valid. | |
1829 | * | |
1830 | * Note that libmount also monitors /run/mount mkdir if the directory does not exist yet. The mkdir | |
1831 | * may generate event which is irrelevant for us. | |
1832 | * | |
1833 | * error: r < 0; valid: r == 0, false positive: r == 1 */ | |
1834 | do { | |
1835 | r = mnt_monitor_next_change(m->mount_monitor, NULL, NULL); | |
1836 | if (r < 0) | |
1837 | return log_error_errno(r, "Failed to drain libmount events: %m"); | |
1838 | if (r == 0) | |
1839 | rescan = true; | |
1840 | } while (r == 0); | |
1841 | ||
1842 | return rescan; | |
1843 | } | |
1844 | ||
1845 | static int mount_process_proc_self_mountinfo(Manager *m) { | |
1846 | _cleanup_set_free_free_ Set *around = NULL, *gone = NULL; | |
1847 | const char *what; | |
1848 | Iterator i; | |
1849 | Unit *u; | |
1850 | int r; | |
1851 | ||
1852 | assert(m); | |
1853 | ||
1854 | r = drain_libmount(m); | |
1855 | if (r <= 0) | |
1856 | return r; | |
1857 | ||
1858 | r = mount_load_proc_self_mountinfo(m, true); | |
1859 | if (r < 0) { | |
1860 | /* Reset flags, just in case, for later calls */ | |
1861 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) | |
1862 | MOUNT(u)->proc_flags = 0; | |
1863 | ||
1864 | return 0; | |
1865 | } | |
1866 | ||
1867 | manager_dispatch_load_queue(m); | |
1868 | ||
1869 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) { | |
1870 | Mount *mount = MOUNT(u); | |
1871 | ||
1872 | if (!mount_is_mounted(mount)) { | |
1873 | ||
1874 | /* A mount point is not around right now. It | |
1875 | * might be gone, or might never have | |
1876 | * existed. */ | |
1877 | ||
1878 | if (mount->from_proc_self_mountinfo && | |
1879 | mount->parameters_proc_self_mountinfo.what) { | |
1880 | ||
1881 | /* Remember that this device might just have disappeared */ | |
1882 | if (set_ensure_allocated(&gone, &path_hash_ops) < 0 || | |
1883 | set_put_strdup(gone, mount->parameters_proc_self_mountinfo.what) < 0) | |
1884 | log_oom(); /* we don't care too much about OOM here... */ | |
1885 | } | |
1886 | ||
1887 | mount->from_proc_self_mountinfo = false; | |
1888 | assert_se(update_parameters_proc_self_mountinfo(mount, NULL, NULL, NULL) >= 0); | |
1889 | ||
1890 | switch (mount->state) { | |
1891 | ||
1892 | case MOUNT_MOUNTED: | |
1893 | /* This has just been unmounted by somebody else, follow the state change. */ | |
1894 | mount_enter_dead(mount, MOUNT_SUCCESS); | |
1895 | break; | |
1896 | ||
1897 | default: | |
1898 | break; | |
1899 | } | |
1900 | ||
1901 | } else if (mount->proc_flags & (MOUNT_PROC_JUST_MOUNTED|MOUNT_PROC_JUST_CHANGED)) { | |
1902 | ||
1903 | /* A mount point was added or changed */ | |
1904 | ||
1905 | switch (mount->state) { | |
1906 | ||
1907 | case MOUNT_DEAD: | |
1908 | case MOUNT_FAILED: | |
1909 | ||
1910 | /* This has just been mounted by somebody else, follow the state change, but let's | |
1911 | * generate a new invocation ID for this implicitly and automatically. */ | |
1912 | (void) unit_acquire_invocation_id(u); | |
1913 | mount_cycle_clear(mount); | |
1914 | mount_enter_mounted(mount, MOUNT_SUCCESS); | |
1915 | break; | |
1916 | ||
1917 | case MOUNT_MOUNTING: | |
1918 | mount_set_state(mount, MOUNT_MOUNTING_DONE); | |
1919 | break; | |
1920 | ||
1921 | default: | |
1922 | /* Nothing really changed, but let's | |
1923 | * issue an notification call | |
1924 | * nonetheless, in case somebody is | |
1925 | * waiting for this. (e.g. file system | |
1926 | * ro/rw remounts.) */ | |
1927 | mount_set_state(mount, mount->state); | |
1928 | break; | |
1929 | } | |
1930 | } | |
1931 | ||
1932 | if (mount_is_mounted(mount) && | |
1933 | mount->from_proc_self_mountinfo && | |
1934 | mount->parameters_proc_self_mountinfo.what) { | |
1935 | /* Track devices currently used */ | |
1936 | ||
1937 | if (set_ensure_allocated(&around, &path_hash_ops) < 0 || | |
1938 | set_put_strdup(around, mount->parameters_proc_self_mountinfo.what) < 0) | |
1939 | log_oom(); | |
1940 | } | |
1941 | ||
1942 | /* Reset the flags for later calls */ | |
1943 | mount->proc_flags = 0; | |
1944 | } | |
1945 | ||
1946 | SET_FOREACH(what, gone, i) { | |
1947 | if (set_contains(around, what)) | |
1948 | continue; | |
1949 | ||
1950 | /* Let the device units know that the device is no longer mounted */ | |
1951 | device_found_node(m, what, 0, DEVICE_FOUND_MOUNT); | |
1952 | } | |
1953 | ||
1954 | return 0; | |
1955 | } | |
1956 | ||
1957 | static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { | |
1958 | Manager *m = userdata; | |
1959 | ||
1960 | assert(m); | |
1961 | assert(revents & EPOLLIN); | |
1962 | ||
1963 | return mount_process_proc_self_mountinfo(m); | |
1964 | } | |
1965 | ||
1966 | static void mount_reset_failed(Unit *u) { | |
1967 | Mount *m = MOUNT(u); | |
1968 | ||
1969 | assert(m); | |
1970 | ||
1971 | if (m->state == MOUNT_FAILED) | |
1972 | mount_set_state(m, MOUNT_DEAD); | |
1973 | ||
1974 | m->result = MOUNT_SUCCESS; | |
1975 | m->reload_result = MOUNT_SUCCESS; | |
1976 | m->clean_result = MOUNT_SUCCESS; | |
1977 | } | |
1978 | ||
1979 | static int mount_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { | |
1980 | Mount *m = MOUNT(u); | |
1981 | ||
1982 | assert(m); | |
1983 | ||
1984 | return unit_kill_common(u, who, signo, -1, m->control_pid, error); | |
1985 | } | |
1986 | ||
1987 | static int mount_control_pid(Unit *u) { | |
1988 | Mount *m = MOUNT(u); | |
1989 | ||
1990 | assert(m); | |
1991 | ||
1992 | return m->control_pid; | |
1993 | } | |
1994 | ||
1995 | static int mount_clean(Unit *u, ExecCleanMask mask) { | |
1996 | _cleanup_strv_free_ char **l = NULL; | |
1997 | Mount *m = MOUNT(u); | |
1998 | int r; | |
1999 | ||
2000 | assert(m); | |
2001 | assert(mask != 0); | |
2002 | ||
2003 | if (m->state != MOUNT_DEAD) | |
2004 | return -EBUSY; | |
2005 | ||
2006 | r = exec_context_get_clean_directories(&m->exec_context, u->manager->prefix, mask, &l); | |
2007 | if (r < 0) | |
2008 | return r; | |
2009 | ||
2010 | if (strv_isempty(l)) | |
2011 | return -EUNATCH; | |
2012 | ||
2013 | mount_unwatch_control_pid(m); | |
2014 | m->clean_result = MOUNT_SUCCESS; | |
2015 | m->control_command = NULL; | |
2016 | m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; | |
2017 | ||
2018 | r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->exec_context.timeout_clean_usec)); | |
2019 | if (r < 0) | |
2020 | goto fail; | |
2021 | ||
2022 | r = unit_fork_and_watch_rm_rf(u, l, &m->control_pid); | |
2023 | if (r < 0) | |
2024 | goto fail; | |
2025 | ||
2026 | mount_set_state(m, MOUNT_CLEANING); | |
2027 | ||
2028 | return 0; | |
2029 | ||
2030 | fail: | |
2031 | log_unit_warning_errno(u, r, "Failed to initiate cleaning: %m"); | |
2032 | m->clean_result = MOUNT_FAILURE_RESOURCES; | |
2033 | m->timer_event_source = sd_event_source_unref(m->timer_event_source); | |
2034 | return r; | |
2035 | } | |
2036 | ||
2037 | static int mount_can_clean(Unit *u, ExecCleanMask *ret) { | |
2038 | Mount *m = MOUNT(u); | |
2039 | ||
2040 | assert(m); | |
2041 | ||
2042 | return exec_context_get_clean_mask(&m->exec_context, ret); | |
2043 | } | |
2044 | ||
2045 | static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = { | |
2046 | [MOUNT_EXEC_MOUNT] = "ExecMount", | |
2047 | [MOUNT_EXEC_UNMOUNT] = "ExecUnmount", | |
2048 | [MOUNT_EXEC_REMOUNT] = "ExecRemount", | |
2049 | }; | |
2050 | ||
2051 | DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand); | |
2052 | ||
2053 | static const char* const mount_result_table[_MOUNT_RESULT_MAX] = { | |
2054 | [MOUNT_SUCCESS] = "success", | |
2055 | [MOUNT_FAILURE_RESOURCES] = "resources", | |
2056 | [MOUNT_FAILURE_TIMEOUT] = "timeout", | |
2057 | [MOUNT_FAILURE_EXIT_CODE] = "exit-code", | |
2058 | [MOUNT_FAILURE_SIGNAL] = "signal", | |
2059 | [MOUNT_FAILURE_CORE_DUMP] = "core-dump", | |
2060 | [MOUNT_FAILURE_START_LIMIT_HIT] = "start-limit-hit", | |
2061 | [MOUNT_FAILURE_PROTOCOL] = "protocol", | |
2062 | }; | |
2063 | ||
2064 | DEFINE_STRING_TABLE_LOOKUP(mount_result, MountResult); | |
2065 | ||
2066 | const UnitVTable mount_vtable = { | |
2067 | .object_size = sizeof(Mount), | |
2068 | .exec_context_offset = offsetof(Mount, exec_context), | |
2069 | .cgroup_context_offset = offsetof(Mount, cgroup_context), | |
2070 | .kill_context_offset = offsetof(Mount, kill_context), | |
2071 | .exec_runtime_offset = offsetof(Mount, exec_runtime), | |
2072 | .dynamic_creds_offset = offsetof(Mount, dynamic_creds), | |
2073 | ||
2074 | .sections = | |
2075 | "Unit\0" | |
2076 | "Mount\0" | |
2077 | "Install\0", | |
2078 | .private_section = "Mount", | |
2079 | ||
2080 | .can_transient = true, | |
2081 | .can_fail = true, | |
2082 | ||
2083 | .init = mount_init, | |
2084 | .load = mount_load, | |
2085 | .done = mount_done, | |
2086 | ||
2087 | .coldplug = mount_coldplug, | |
2088 | ||
2089 | .dump = mount_dump, | |
2090 | ||
2091 | .start = mount_start, | |
2092 | .stop = mount_stop, | |
2093 | .reload = mount_reload, | |
2094 | ||
2095 | .kill = mount_kill, | |
2096 | .clean = mount_clean, | |
2097 | .can_clean = mount_can_clean, | |
2098 | ||
2099 | .serialize = mount_serialize, | |
2100 | .deserialize_item = mount_deserialize_item, | |
2101 | ||
2102 | .active_state = mount_active_state, | |
2103 | .sub_state_to_string = mount_sub_state_to_string, | |
2104 | ||
2105 | .will_restart = unit_will_restart_default, | |
2106 | ||
2107 | .may_gc = mount_may_gc, | |
2108 | ||
2109 | .sigchld_event = mount_sigchld_event, | |
2110 | ||
2111 | .reset_failed = mount_reset_failed, | |
2112 | ||
2113 | .control_pid = mount_control_pid, | |
2114 | ||
2115 | .bus_vtable = bus_mount_vtable, | |
2116 | .bus_set_property = bus_mount_set_property, | |
2117 | .bus_commit_properties = bus_mount_commit_properties, | |
2118 | ||
2119 | .get_timeout = mount_get_timeout, | |
2120 | ||
2121 | .enumerate_perpetual = mount_enumerate_perpetual, | |
2122 | .enumerate = mount_enumerate, | |
2123 | .shutdown = mount_shutdown, | |
2124 | ||
2125 | .status_message_formats = { | |
2126 | .starting_stopping = { | |
2127 | [0] = "Mounting %s...", | |
2128 | [1] = "Unmounting %s...", | |
2129 | }, | |
2130 | .finished_start_job = { | |
2131 | [JOB_DONE] = "Mounted %s.", | |
2132 | [JOB_FAILED] = "Failed to mount %s.", | |
2133 | [JOB_TIMEOUT] = "Timed out mounting %s.", | |
2134 | }, | |
2135 | .finished_stop_job = { | |
2136 | [JOB_DONE] = "Unmounted %s.", | |
2137 | [JOB_FAILED] = "Failed unmounting %s.", | |
2138 | [JOB_TIMEOUT] = "Timed out unmounting %s.", | |
2139 | }, | |
2140 | }, | |
2141 | }; |