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1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ | |
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 "fs-util.h" | |
17 | #include "fstab-util.h" | |
18 | #include "initrd-util.h" | |
19 | #include "libmount-util.h" | |
20 | #include "log.h" | |
21 | #include "manager.h" | |
22 | #include "mkdir-label.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 "stat-util.h" | |
32 | #include "string-table.h" | |
33 | #include "string-util.h" | |
34 | #include "strv.h" | |
35 | #include "unit-name.h" | |
36 | #include "unit.h" | |
37 | #include "utf8.h" | |
38 | ||
39 | #define RETRY_UMOUNT_MAX 32 | |
40 | ||
41 | static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = { | |
42 | [MOUNT_DEAD] = UNIT_INACTIVE, | |
43 | [MOUNT_MOUNTING] = UNIT_ACTIVATING, | |
44 | [MOUNT_MOUNTING_DONE] = UNIT_ACTIVATING, | |
45 | [MOUNT_MOUNTED] = UNIT_ACTIVE, | |
46 | [MOUNT_REMOUNTING] = UNIT_RELOADING, | |
47 | [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING, | |
48 | [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING, | |
49 | [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING, | |
50 | [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING, | |
51 | [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING, | |
52 | [MOUNT_FAILED] = UNIT_FAILED, | |
53 | [MOUNT_CLEANING] = UNIT_MAINTENANCE, | |
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 | static void mount_enter_dead(Mount *m, MountResult f); | |
59 | static void mount_enter_mounted(Mount *m, MountResult f); | |
60 | static void mount_cycle_clear(Mount *m); | |
61 | static int mount_process_proc_self_mountinfo(Manager *m); | |
62 | ||
63 | static bool MOUNT_STATE_WITH_PROCESS(MountState state) { | |
64 | return IN_SET(state, | |
65 | MOUNT_MOUNTING, | |
66 | MOUNT_MOUNTING_DONE, | |
67 | MOUNT_REMOUNTING, | |
68 | MOUNT_REMOUNTING_SIGTERM, | |
69 | MOUNT_REMOUNTING_SIGKILL, | |
70 | MOUNT_UNMOUNTING, | |
71 | MOUNT_UNMOUNTING_SIGTERM, | |
72 | MOUNT_UNMOUNTING_SIGKILL, | |
73 | MOUNT_CLEANING); | |
74 | } | |
75 | ||
76 | static MountParameters* get_mount_parameters_fragment(Mount *m) { | |
77 | assert(m); | |
78 | ||
79 | if (m->from_fragment) | |
80 | return &m->parameters_fragment; | |
81 | ||
82 | return NULL; | |
83 | } | |
84 | ||
85 | static MountParameters* get_mount_parameters(Mount *m) { | |
86 | assert(m); | |
87 | ||
88 | if (m->from_proc_self_mountinfo) | |
89 | return &m->parameters_proc_self_mountinfo; | |
90 | ||
91 | return get_mount_parameters_fragment(m); | |
92 | } | |
93 | ||
94 | static bool mount_is_network(const MountParameters *p) { | |
95 | assert(p); | |
96 | ||
97 | if (fstab_test_option(p->options, "_netdev\0")) | |
98 | return true; | |
99 | ||
100 | if (p->fstype && fstype_is_network(p->fstype)) | |
101 | return true; | |
102 | ||
103 | return false; | |
104 | } | |
105 | ||
106 | static bool mount_is_nofail(const Mount *m) { | |
107 | assert(m); | |
108 | ||
109 | if (!m->from_fragment) | |
110 | return false; | |
111 | ||
112 | return fstab_test_yes_no_option(m->parameters_fragment.options, "nofail\0" "fail\0"); | |
113 | } | |
114 | ||
115 | static bool mount_is_loop(const MountParameters *p) { | |
116 | assert(p); | |
117 | ||
118 | if (fstab_test_option(p->options, "loop\0")) | |
119 | return true; | |
120 | ||
121 | return false; | |
122 | } | |
123 | ||
124 | static bool mount_is_bind(const MountParameters *p) { | |
125 | assert(p); | |
126 | return fstab_is_bind(p->options, p->fstype); | |
127 | } | |
128 | ||
129 | static int mount_is_bound_to_device(Mount *m) { | |
130 | _cleanup_free_ char *value = NULL; | |
131 | const MountParameters *p; | |
132 | int r; | |
133 | ||
134 | assert(m); | |
135 | ||
136 | /* Determines whether to place a Requires= or BindsTo= dependency on the backing device unit. We do | |
137 | * this by checking for the x-systemd.device-bound= mount option. If it is enabled we use BindsTo=, | |
138 | * otherwise Requires=. But note that we might combine the latter with StopPropagatedFrom=, see | |
139 | * below. */ | |
140 | ||
141 | p = get_mount_parameters(m); | |
142 | if (!p) | |
143 | return false; | |
144 | ||
145 | r = fstab_filter_options(p->options, "x-systemd.device-bound\0", NULL, &value, NULL, NULL); | |
146 | if (r < 0) | |
147 | return r; | |
148 | if (r == 0) | |
149 | return -EIDRM; /* If unspecified at all, return recognizable error */ | |
150 | ||
151 | if (isempty(value)) | |
152 | return true; | |
153 | ||
154 | return parse_boolean(value); | |
155 | } | |
156 | ||
157 | static bool mount_propagate_stop(Mount *m) { | |
158 | int r; | |
159 | ||
160 | assert(m); | |
161 | ||
162 | r = mount_is_bound_to_device(m); | |
163 | if (r >= 0) | |
164 | /* If x-systemd.device-bound=no is explicitly requested by user, don't try to set StopPropagatedFrom=. | |
165 | * Also don't bother if true, since with BindsTo= the stop propagation is implicit. */ | |
166 | return false; | |
167 | if (r != -EIDRM) | |
168 | log_debug_errno(r, "Failed to get x-systemd.device-bound= option, ignoring: %m"); | |
169 | ||
170 | return m->from_fragment; /* let's propagate stop whenever this is an explicitly configured unit, | |
171 | * otherwise let's not bother. */ | |
172 | } | |
173 | ||
174 | static void mount_init(Unit *u) { | |
175 | Mount *m = ASSERT_PTR(MOUNT(u)); | |
176 | ||
177 | assert(u->load_state == UNIT_STUB); | |
178 | ||
179 | m->timeout_usec = u->manager->defaults.timeout_start_usec; | |
180 | ||
181 | m->exec_context.std_output = u->manager->defaults.std_output; | |
182 | m->exec_context.std_error = u->manager->defaults.std_error; | |
183 | ||
184 | m->directory_mode = 0755; | |
185 | ||
186 | /* We need to make sure that /usr/bin/mount is always called | |
187 | * in the same process group as us, so that the autofs kernel | |
188 | * side doesn't send us another mount request while we are | |
189 | * already trying to comply its last one. */ | |
190 | m->exec_context.same_pgrp = true; | |
191 | ||
192 | m->control_pid = PIDREF_NULL; | |
193 | m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; | |
194 | ||
195 | u->ignore_on_isolate = true; | |
196 | } | |
197 | ||
198 | static int mount_arm_timer(Mount *m, bool relative, usec_t usec) { | |
199 | assert(m); | |
200 | ||
201 | return unit_arm_timer(UNIT(m), &m->timer_event_source, relative, usec, mount_dispatch_timer); | |
202 | } | |
203 | ||
204 | static void mount_unwatch_control_pid(Mount *m) { | |
205 | assert(m); | |
206 | unit_unwatch_pidref_done(UNIT(m), &m->control_pid); | |
207 | } | |
208 | ||
209 | static void mount_parameters_done(MountParameters *p) { | |
210 | assert(p); | |
211 | ||
212 | p->what = mfree(p->what); | |
213 | p->options = mfree(p->options); | |
214 | p->fstype = mfree(p->fstype); | |
215 | } | |
216 | ||
217 | static void mount_done(Unit *u) { | |
218 | Mount *m = ASSERT_PTR(MOUNT(u)); | |
219 | ||
220 | m->where = mfree(m->where); | |
221 | ||
222 | mount_parameters_done(&m->parameters_proc_self_mountinfo); | |
223 | mount_parameters_done(&m->parameters_fragment); | |
224 | ||
225 | m->exec_runtime = exec_runtime_free(m->exec_runtime); | |
226 | ||
227 | exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX); | |
228 | m->control_command = NULL; | |
229 | ||
230 | mount_unwatch_control_pid(m); | |
231 | ||
232 | m->timer_event_source = sd_event_source_disable_unref(m->timer_event_source); | |
233 | } | |
234 | ||
235 | static int update_parameters_proc_self_mountinfo( | |
236 | Mount *m, | |
237 | const char *what, | |
238 | const char *options, | |
239 | const char *fstype) { | |
240 | ||
241 | MountParameters *p; | |
242 | int r, q, w; | |
243 | ||
244 | assert(m); | |
245 | ||
246 | p = &m->parameters_proc_self_mountinfo; | |
247 | ||
248 | r = free_and_strdup(&p->what, what); | |
249 | if (r < 0) | |
250 | return r; | |
251 | ||
252 | q = free_and_strdup(&p->options, options); | |
253 | if (q < 0) | |
254 | return q; | |
255 | ||
256 | w = free_and_strdup(&p->fstype, fstype); | |
257 | if (w < 0) | |
258 | return w; | |
259 | ||
260 | return r > 0 || q > 0 || w > 0; | |
261 | } | |
262 | ||
263 | static int mount_add_mount_dependencies(Mount *m) { | |
264 | MountParameters *pm; | |
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 | r = path_extract_directory(m->where, &parent); | |
275 | if (r < 0) | |
276 | return r; | |
277 | ||
278 | r = unit_add_mounts_for(UNIT(m), parent, UNIT_DEPENDENCY_IMPLICIT, UNIT_MOUNT_REQUIRES); | |
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_add_mounts_for(UNIT(m), pm->what, UNIT_DEPENDENCY_FILE, UNIT_MOUNT_REQUIRES); | |
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 | for (UnitMountDependencyType t = 0; t < _UNIT_MOUNT_DEPENDENCY_TYPE_MAX; ++t) { | |
297 | Unit *other; | |
298 | Set *s = manager_get_units_needing_mounts_for(UNIT(m)->manager, m->where, t); | |
299 | ||
300 | SET_FOREACH(other, s) { | |
301 | if (other->load_state != UNIT_LOADED) | |
302 | continue; | |
303 | ||
304 | if (other == UNIT(m)) | |
305 | continue; | |
306 | ||
307 | r = unit_add_dependency( | |
308 | other, | |
309 | UNIT_AFTER, | |
310 | UNIT(m), | |
311 | /* add_reference= */ true, | |
312 | UNIT_DEPENDENCY_PATH); | |
313 | if (r < 0) | |
314 | return r; | |
315 | ||
316 | if (UNIT(m)->fragment_path) { | |
317 | /* If we have fragment configuration, then make this dependency required/wanted */ | |
318 | r = unit_add_dependency( | |
319 | other, | |
320 | unit_mount_dependency_type_to_dependency_type(t), | |
321 | UNIT(m), | |
322 | /* add_reference= */ true, | |
323 | UNIT_DEPENDENCY_PATH); | |
324 | if (r < 0) | |
325 | return r; | |
326 | } | |
327 | } | |
328 | } | |
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
333 | static int mount_add_device_dependencies(Mount *m) { | |
334 | UnitDependencyMask mask; | |
335 | MountParameters *p; | |
336 | UnitDependency dep; | |
337 | int r; | |
338 | ||
339 | assert(m); | |
340 | ||
341 | log_unit_trace(UNIT(m), "Processing implicit device dependencies"); | |
342 | ||
343 | p = get_mount_parameters(m); | |
344 | if (!p) { | |
345 | log_unit_trace(UNIT(m), "Missing mount parameters, skipping implicit device dependencies"); | |
346 | return 0; | |
347 | } | |
348 | ||
349 | if (!p->what) { | |
350 | log_unit_trace(UNIT(m), "Missing mount source, skipping implicit device dependencies"); | |
351 | return 0; | |
352 | } | |
353 | ||
354 | if (mount_is_bind(p)) { | |
355 | log_unit_trace(UNIT(m), "Mount unit is a bind mount, skipping implicit device dependencies"); | |
356 | return 0; | |
357 | } | |
358 | ||
359 | if (!is_device_path(p->what)) { | |
360 | log_unit_trace(UNIT(m), "Mount source is not a device path, skipping implicit device dependencies"); | |
361 | return 0; | |
362 | } | |
363 | ||
364 | /* /dev/root is a really weird thing, it's not a real device, but just a path the kernel exports for | |
365 | * the root file system specified on the kernel command line. Ignore it here. */ | |
366 | if (PATH_IN_SET(p->what, "/dev/root", "/dev/nfs")) { | |
367 | log_unit_trace(UNIT(m), "Mount source is in /dev/root or /dev/nfs, skipping implicit device dependencies"); | |
368 | return 0; | |
369 | } | |
370 | ||
371 | if (path_equal(m->where, "/")) { | |
372 | log_unit_trace(UNIT(m), "Mount destination is '/', skipping implicit device dependencies"); | |
373 | return 0; | |
374 | } | |
375 | ||
376 | /* Mount units from /proc/self/mountinfo are not bound to devices by default since they're subject to | |
377 | * races when mounts are established by other tools with different backing devices than what we | |
378 | * maintain. The user can still force this to be a BindsTo= dependency with an appropriate option (or | |
379 | * udev property) so the mount units are automatically stopped when the device disappears | |
380 | * suddenly. */ | |
381 | dep = mount_is_bound_to_device(m) > 0 ? UNIT_BINDS_TO : UNIT_REQUIRES; | |
382 | ||
383 | /* We always use 'what' from /proc/self/mountinfo if mounted */ | |
384 | mask = m->from_proc_self_mountinfo ? UNIT_DEPENDENCY_MOUNTINFO : UNIT_DEPENDENCY_MOUNT_FILE; | |
385 | ||
386 | r = unit_add_node_dependency(UNIT(m), p->what, dep, mask); | |
387 | if (r < 0) | |
388 | return r; | |
389 | if (r > 0) | |
390 | log_unit_trace(UNIT(m), "Added %s dependency on %s", unit_dependency_to_string(dep), p->what); | |
391 | ||
392 | if (mount_propagate_stop(m)) { | |
393 | r = unit_add_node_dependency(UNIT(m), p->what, UNIT_STOP_PROPAGATED_FROM, mask); | |
394 | if (r < 0) | |
395 | return r; | |
396 | if (r > 0) | |
397 | log_unit_trace(UNIT(m), "Added %s dependency on %s", | |
398 | unit_dependency_to_string(UNIT_STOP_PROPAGATED_FROM), p->what); | |
399 | } | |
400 | ||
401 | r = unit_add_blockdev_dependency(UNIT(m), p->what, mask); | |
402 | if (r > 0) | |
403 | log_unit_trace(UNIT(m), "Added %s dependency on %s", unit_dependency_to_string(UNIT_AFTER), p->what); | |
404 | ||
405 | return 0; | |
406 | } | |
407 | ||
408 | static bool mount_is_extrinsic(Unit *u) { | |
409 | Mount *m = ASSERT_PTR(MOUNT(u)); | |
410 | MountParameters *p; | |
411 | ||
412 | /* Returns true for all units that are "magic" and should be excluded from the usual | |
413 | * start-up and shutdown dependencies. We call them "extrinsic" here, as they are generally | |
414 | * mounted outside of the systemd dependency logic. We shouldn't attempt to manage them | |
415 | * ourselves but it's fine if the user operates on them with us. */ | |
416 | ||
417 | /* We only automatically manage mounts if we are in system mode */ | |
418 | if (MANAGER_IS_USER(u->manager)) | |
419 | return true; | |
420 | ||
421 | p = get_mount_parameters(m); | |
422 | if (p && fstab_is_extrinsic(m->where, p->options)) | |
423 | return true; | |
424 | ||
425 | return false; | |
426 | } | |
427 | ||
428 | static bool mount_is_credentials(Mount *m) { | |
429 | const char *e; | |
430 | ||
431 | assert(m); | |
432 | ||
433 | /* Returns true if this is a credentials mount. We don't want automatic dependencies on credential | |
434 | * mounts, since they are managed by us for even the earliest services, and we never want anything to | |
435 | * be ordered before them hence. */ | |
436 | ||
437 | e = path_startswith(m->where, UNIT(m)->manager->prefix[EXEC_DIRECTORY_RUNTIME]); | |
438 | if (!e) | |
439 | return false; | |
440 | ||
441 | return !isempty(path_startswith(e, "credentials")); | |
442 | } | |
443 | ||
444 | static int mount_add_default_ordering_dependencies(Mount *m, MountParameters *p, UnitDependencyMask mask) { | |
445 | const char *after, *before, *e; | |
446 | int r; | |
447 | ||
448 | assert(m); | |
449 | ||
450 | e = path_startswith(m->where, "/sysroot"); | |
451 | if (e && in_initrd()) { | |
452 | /* All mounts under /sysroot need to happen later, at initrd-fs.target time. IOW, | |
453 | * it's not technically part of the basic initrd filesystem itself, and so | |
454 | * shouldn't inherit the default Before=local-fs.target dependency. However, | |
455 | * these mounts still need to start after local-fs-pre.target, as a sync point | |
456 | * for things like systemd-hibernate-resume.service that should start before | |
457 | * any mounts. */ | |
458 | ||
459 | after = SPECIAL_LOCAL_FS_PRE_TARGET; | |
460 | before = isempty(e) ? SPECIAL_INITRD_ROOT_FS_TARGET : SPECIAL_INITRD_FS_TARGET; | |
461 | ||
462 | } else if (in_initrd() && path_startswith(m->where, "/sysusr/usr")) { | |
463 | after = SPECIAL_LOCAL_FS_PRE_TARGET; | |
464 | before = SPECIAL_INITRD_USR_FS_TARGET; | |
465 | ||
466 | } else if (mount_is_credentials(m)) | |
467 | after = before = NULL; | |
468 | ||
469 | else if (mount_is_network(p)) { | |
470 | after = SPECIAL_REMOTE_FS_PRE_TARGET; | |
471 | before = SPECIAL_REMOTE_FS_TARGET; | |
472 | ||
473 | } else { | |
474 | after = SPECIAL_LOCAL_FS_PRE_TARGET; | |
475 | before = SPECIAL_LOCAL_FS_TARGET; | |
476 | } | |
477 | ||
478 | if (before && !mount_is_nofail(m)) { | |
479 | r = unit_add_dependency_by_name(UNIT(m), UNIT_BEFORE, before, /* add_reference= */ true, mask); | |
480 | if (r < 0) | |
481 | return r; | |
482 | } | |
483 | ||
484 | if (after) { | |
485 | r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, /* add_reference= */ true, mask); | |
486 | if (r < 0) | |
487 | return r; | |
488 | } | |
489 | ||
490 | r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, | |
491 | /* add_reference= */ true, mask); | |
492 | if (r < 0) | |
493 | return r; | |
494 | ||
495 | /* If this is a tmpfs mount then we have to unmount it before we try to deactivate swaps */ | |
496 | if (streq_ptr(p->fstype, "tmpfs") && !mount_is_credentials(m)) { | |
497 | r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_SWAP_TARGET, | |
498 | /* add_reference= */ true, mask); | |
499 | if (r < 0) | |
500 | return r; | |
501 | } | |
502 | ||
503 | return 0; | |
504 | } | |
505 | ||
506 | static int mount_add_default_network_dependencies(Mount *m, MountParameters *p, UnitDependencyMask mask) { | |
507 | int r; | |
508 | ||
509 | assert(m); | |
510 | ||
511 | if (!mount_is_network(p)) | |
512 | return 0; | |
513 | ||
514 | /* We order ourselves after network.target. This is primarily useful at shutdown: services that take | |
515 | * down the network should order themselves before network.target, so that they are shut down only | |
516 | * after this mount unit is stopped. */ | |
517 | ||
518 | r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_NETWORK_TARGET, | |
519 | /* add_reference= */ true, mask); | |
520 | if (r < 0) | |
521 | return r; | |
522 | ||
523 | /* We pull in network-online.target, and order ourselves after it. This is useful at start-up to | |
524 | * actively pull in tools that want to be started before we start mounting network file systems, and | |
525 | * whose purpose it is to delay this until the network is "up". */ | |
526 | ||
527 | return unit_add_two_dependencies_by_name(UNIT(m), UNIT_WANTS, UNIT_AFTER, SPECIAL_NETWORK_ONLINE_TARGET, | |
528 | /* add_reference= */ true, mask); | |
529 | } | |
530 | ||
531 | static int mount_add_default_dependencies(Mount *m) { | |
532 | UnitDependencyMask mask; | |
533 | MountParameters *p; | |
534 | int r; | |
535 | ||
536 | assert(m); | |
537 | ||
538 | if (!UNIT(m)->default_dependencies) | |
539 | return 0; | |
540 | ||
541 | /* We do not add any default dependencies to /, /usr or /run/initramfs/, since they are | |
542 | * guaranteed to stay mounted the whole time, since our system is on it. Also, don't | |
543 | * bother with anything mounted below virtual file systems, it's also going to be virtual, | |
544 | * and hence not worth the effort. */ | |
545 | if (mount_is_extrinsic(UNIT(m))) | |
546 | return 0; | |
547 | ||
548 | p = get_mount_parameters(m); | |
549 | if (!p) | |
550 | return 0; | |
551 | ||
552 | mask = m->from_proc_self_mountinfo ? UNIT_DEPENDENCY_MOUNTINFO : UNIT_DEPENDENCY_MOUNT_FILE; | |
553 | ||
554 | r = mount_add_default_ordering_dependencies(m, p, mask); | |
555 | if (r < 0) | |
556 | return r; | |
557 | ||
558 | r = mount_add_default_network_dependencies(m, p, mask); | |
559 | if (r < 0) | |
560 | return r; | |
561 | ||
562 | return 0; | |
563 | } | |
564 | ||
565 | static int mount_verify(Mount *m) { | |
566 | _cleanup_free_ char *e = NULL; | |
567 | MountParameters *p; | |
568 | int r; | |
569 | ||
570 | assert(m); | |
571 | assert(UNIT(m)->load_state == UNIT_LOADED); | |
572 | ||
573 | if (!m->from_fragment && !m->from_proc_self_mountinfo && !UNIT(m)->perpetual) | |
574 | return -ENOENT; | |
575 | ||
576 | r = unit_name_from_path(m->where, ".mount", &e); | |
577 | if (r < 0) | |
578 | return log_unit_error_errno(UNIT(m), r, "Failed to generate unit name from mount path: %m"); | |
579 | ||
580 | if (!unit_has_name(UNIT(m), e)) | |
581 | return log_unit_error_errno(UNIT(m), SYNTHETIC_ERRNO(ENOEXEC), "Where= setting doesn't match unit name. Refusing."); | |
582 | ||
583 | if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) | |
584 | return log_unit_error_errno(UNIT(m), SYNTHETIC_ERRNO(ENOEXEC), "Cannot create mount unit for API file system %s. Refusing.", m->where); | |
585 | ||
586 | p = get_mount_parameters_fragment(m); | |
587 | if (p && !p->what && !UNIT(m)->perpetual) | |
588 | return log_unit_error_errno(UNIT(m), SYNTHETIC_ERRNO(ENOEXEC), | |
589 | "What= setting is missing. Refusing."); | |
590 | ||
591 | if (m->exec_context.pam_name && m->kill_context.kill_mode != KILL_CONTROL_GROUP) | |
592 | return log_unit_error_errno(UNIT(m), SYNTHETIC_ERRNO(ENOEXEC), "Unit has PAM enabled. Kill mode must be set to control-group'. Refusing."); | |
593 | ||
594 | return 0; | |
595 | } | |
596 | ||
597 | static int mount_add_non_exec_dependencies(Mount *m) { | |
598 | int r; | |
599 | ||
600 | assert(m); | |
601 | ||
602 | /* We may be called due to this mount appearing in /proc/self/mountinfo, hence we clear all existing | |
603 | * dependencies that were initialized from the unit file but whose final value really depends on the | |
604 | * content of /proc/self/mountinfo. Some (such as m->where) might have become stale now. */ | |
605 | unit_remove_dependencies(UNIT(m), UNIT_DEPENDENCY_MOUNTINFO | UNIT_DEPENDENCY_MOUNT_FILE); | |
606 | ||
607 | if (!m->where) | |
608 | return 0; | |
609 | ||
610 | /* Adds in all dependencies directly responsible for ordering the mount, as opposed to dependencies | |
611 | * resulting from the ExecContext and such. */ | |
612 | ||
613 | r = mount_add_device_dependencies(m); | |
614 | if (r < 0) | |
615 | return r; | |
616 | ||
617 | r = mount_add_mount_dependencies(m); | |
618 | if (r < 0) | |
619 | return r; | |
620 | ||
621 | r = mount_add_default_dependencies(m); | |
622 | if (r < 0) | |
623 | return r; | |
624 | ||
625 | return 0; | |
626 | } | |
627 | ||
628 | static int mount_add_extras(Mount *m) { | |
629 | Unit *u = UNIT(ASSERT_PTR(m)); | |
630 | int r; | |
631 | ||
632 | /* Note: this call might be called after we already have been loaded once (and even when it has already been | |
633 | * activated), in case data from /proc/self/mountinfo has changed. This means all code here needs to be ready | |
634 | * to run with an already set up unit. */ | |
635 | ||
636 | if (u->fragment_path) | |
637 | m->from_fragment = true; | |
638 | ||
639 | if (!m->where) { | |
640 | r = unit_name_to_path(u->id, &m->where); | |
641 | if (r == -ENAMETOOLONG) | |
642 | log_unit_error_errno(u, r, "Failed to derive mount point path from unit name, because unit name is hashed. " | |
643 | "Set \"Where=\" in the unit file explicitly."); | |
644 | if (r < 0) | |
645 | return r; | |
646 | } | |
647 | ||
648 | path_simplify(m->where); | |
649 | ||
650 | if (!u->description) { | |
651 | r = unit_set_description(u, m->where); | |
652 | if (r < 0) | |
653 | return r; | |
654 | } | |
655 | ||
656 | r = unit_patch_contexts(u); | |
657 | if (r < 0) | |
658 | return r; | |
659 | ||
660 | r = unit_add_exec_dependencies(u, &m->exec_context); | |
661 | if (r < 0) | |
662 | return r; | |
663 | ||
664 | r = unit_set_default_slice(u); | |
665 | if (r < 0) | |
666 | return r; | |
667 | ||
668 | r = mount_add_non_exec_dependencies(m); | |
669 | if (r < 0) | |
670 | return r; | |
671 | ||
672 | return 0; | |
673 | } | |
674 | ||
675 | static void mount_load_root_mount(Unit *u) { | |
676 | Mount *m = ASSERT_PTR(MOUNT(u)); | |
677 | ||
678 | if (!unit_has_name(u, SPECIAL_ROOT_MOUNT)) | |
679 | return; | |
680 | ||
681 | u->perpetual = true; | |
682 | u->default_dependencies = false; | |
683 | ||
684 | /* The stdio/kmsg bridge socket is on /, in order to avoid a dep loop, don't use kmsg logging for -.mount */ | |
685 | m->exec_context.std_output = EXEC_OUTPUT_NULL; | |
686 | m->exec_context.std_input = EXEC_INPUT_NULL; | |
687 | ||
688 | if (!u->description) | |
689 | u->description = strdup("Root Mount"); | |
690 | } | |
691 | ||
692 | static int mount_load(Unit *u) { | |
693 | Mount *m = ASSERT_PTR(MOUNT(u)); | |
694 | int r; | |
695 | ||
696 | assert(u->load_state == UNIT_STUB); | |
697 | ||
698 | mount_load_root_mount(u); | |
699 | ||
700 | bool from_kernel = m->from_proc_self_mountinfo || u->perpetual; | |
701 | ||
702 | r = unit_load_fragment_and_dropin(u, /* fragment_required = */ !from_kernel); | |
703 | ||
704 | /* Add in some extras. Note we do this in all cases (even if we failed to load the unit) when announced by the | |
705 | * kernel, because we need some things to be set up no matter what when the kernel establishes a mount and thus | |
706 | * we need to update the state in our unit to track it. After all, consider that we don't allow changing the | |
707 | * 'slice' field for a unit once it is active. */ | |
708 | if (u->load_state == UNIT_LOADED || from_kernel) | |
709 | RET_GATHER(r, mount_add_extras(m)); | |
710 | ||
711 | if (r < 0) | |
712 | return r; | |
713 | ||
714 | if (u->load_state != UNIT_LOADED) | |
715 | return 0; | |
716 | ||
717 | return mount_verify(m); | |
718 | } | |
719 | ||
720 | static void mount_set_state(Mount *m, MountState state) { | |
721 | MountState old_state; | |
722 | ||
723 | assert(m); | |
724 | ||
725 | if (m->state != state) | |
726 | bus_unit_send_pending_change_signal(UNIT(m), false); | |
727 | ||
728 | old_state = m->state; | |
729 | m->state = state; | |
730 | ||
731 | if (!MOUNT_STATE_WITH_PROCESS(state)) { | |
732 | m->timer_event_source = sd_event_source_disable_unref(m->timer_event_source); | |
733 | mount_unwatch_control_pid(m); | |
734 | m->control_command = NULL; | |
735 | m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; | |
736 | } | |
737 | ||
738 | if (state != old_state) | |
739 | log_unit_debug(UNIT(m), "Changed %s -> %s", mount_state_to_string(old_state), mount_state_to_string(state)); | |
740 | ||
741 | unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state], m->reload_result == MOUNT_SUCCESS); | |
742 | } | |
743 | ||
744 | static int mount_coldplug(Unit *u) { | |
745 | Mount *m = ASSERT_PTR(MOUNT(u)); | |
746 | int r; | |
747 | ||
748 | assert(m->state == MOUNT_DEAD); | |
749 | ||
750 | if (m->deserialized_state == m->state) | |
751 | return 0; | |
752 | ||
753 | if (pidref_is_set(&m->control_pid) && | |
754 | pidref_is_unwaited(&m->control_pid) > 0 && | |
755 | MOUNT_STATE_WITH_PROCESS(m->deserialized_state)) { | |
756 | ||
757 | r = unit_watch_pidref(UNIT(m), &m->control_pid, /* exclusive= */ false); | |
758 | if (r < 0) | |
759 | return r; | |
760 | ||
761 | r = mount_arm_timer(m, /* relative= */ false, usec_add(u->state_change_timestamp.monotonic, m->timeout_usec)); | |
762 | if (r < 0) | |
763 | return r; | |
764 | } | |
765 | ||
766 | if (!IN_SET(m->deserialized_state, MOUNT_DEAD, MOUNT_FAILED)) { | |
767 | (void) unit_setup_exec_runtime(u); | |
768 | (void) unit_setup_cgroup_runtime(u); | |
769 | } | |
770 | ||
771 | mount_set_state(m, m->deserialized_state); | |
772 | return 0; | |
773 | } | |
774 | ||
775 | static void mount_catchup(Unit *u) { | |
776 | Mount *m = ASSERT_PTR(MOUNT(u)); | |
777 | ||
778 | /* Adjust the deserialized state. See comments in mount_process_proc_self_mountinfo(). */ | |
779 | if (m->from_proc_self_mountinfo) | |
780 | switch (m->state) { | |
781 | case MOUNT_DEAD: | |
782 | case MOUNT_FAILED: | |
783 | assert(!pidref_is_set(&m->control_pid)); | |
784 | (void) unit_acquire_invocation_id(u); | |
785 | mount_cycle_clear(m); | |
786 | mount_enter_mounted(m, MOUNT_SUCCESS); | |
787 | break; | |
788 | case MOUNT_MOUNTING: | |
789 | assert(pidref_is_set(&m->control_pid)); | |
790 | mount_set_state(m, MOUNT_MOUNTING_DONE); | |
791 | break; | |
792 | default: | |
793 | break; | |
794 | } | |
795 | else | |
796 | switch (m->state) { | |
797 | case MOUNT_MOUNTING_DONE: | |
798 | assert(pidref_is_set(&m->control_pid)); | |
799 | mount_set_state(m, MOUNT_MOUNTING); | |
800 | break; | |
801 | case MOUNT_MOUNTED: | |
802 | assert(!pidref_is_set(&m->control_pid)); | |
803 | mount_enter_dead(m, MOUNT_SUCCESS); | |
804 | break; | |
805 | default: | |
806 | break; | |
807 | } | |
808 | } | |
809 | ||
810 | static void mount_dump(Unit *u, FILE *f, const char *prefix) { | |
811 | Mount *m = ASSERT_PTR(MOUNT(u)); | |
812 | MountParameters *p; | |
813 | ||
814 | assert(f); | |
815 | ||
816 | p = get_mount_parameters(m); | |
817 | ||
818 | fprintf(f, | |
819 | "%sMount State: %s\n" | |
820 | "%sResult: %s\n" | |
821 | "%sClean Result: %s\n" | |
822 | "%sWhere: %s\n" | |
823 | "%sWhat: %s\n" | |
824 | "%sFile System Type: %s\n" | |
825 | "%sOptions: %s\n" | |
826 | "%sFrom /proc/self/mountinfo: %s\n" | |
827 | "%sFrom fragment: %s\n" | |
828 | "%sExtrinsic: %s\n" | |
829 | "%sDirectoryMode: %04o\n" | |
830 | "%sSloppyOptions: %s\n" | |
831 | "%sLazyUnmount: %s\n" | |
832 | "%sForceUnmount: %s\n" | |
833 | "%sReadWriteOnly: %s\n" | |
834 | "%sTimeoutSec: %s\n", | |
835 | prefix, mount_state_to_string(m->state), | |
836 | prefix, mount_result_to_string(m->result), | |
837 | prefix, mount_result_to_string(m->clean_result), | |
838 | prefix, m->where, | |
839 | prefix, p ? strna(p->what) : "n/a", | |
840 | prefix, p ? strna(p->fstype) : "n/a", | |
841 | prefix, p ? strna(p->options) : "n/a", | |
842 | prefix, yes_no(m->from_proc_self_mountinfo), | |
843 | prefix, yes_no(m->from_fragment), | |
844 | prefix, yes_no(mount_is_extrinsic(u)), | |
845 | prefix, m->directory_mode, | |
846 | prefix, yes_no(m->sloppy_options), | |
847 | prefix, yes_no(m->lazy_unmount), | |
848 | prefix, yes_no(m->force_unmount), | |
849 | prefix, yes_no(m->read_write_only), | |
850 | prefix, FORMAT_TIMESPAN(m->timeout_usec, USEC_PER_SEC)); | |
851 | ||
852 | if (pidref_is_set(&m->control_pid)) | |
853 | fprintf(f, | |
854 | "%sControl PID: "PID_FMT"\n", | |
855 | prefix, m->control_pid.pid); | |
856 | ||
857 | exec_context_dump(&m->exec_context, f, prefix); | |
858 | kill_context_dump(&m->kill_context, f, prefix); | |
859 | cgroup_context_dump(UNIT(m), f, prefix); | |
860 | } | |
861 | ||
862 | static int mount_spawn(Mount *m, ExecCommand *c, PidRef *ret_pid) { | |
863 | _cleanup_(exec_params_shallow_clear) ExecParameters exec_params = EXEC_PARAMETERS_INIT( | |
864 | EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN); | |
865 | _cleanup_(pidref_done) PidRef pidref = PIDREF_NULL; | |
866 | int r; | |
867 | ||
868 | assert(m); | |
869 | assert(c); | |
870 | assert(ret_pid); | |
871 | ||
872 | r = unit_prepare_exec(UNIT(m)); | |
873 | if (r < 0) | |
874 | return r; | |
875 | ||
876 | r = mount_arm_timer(m, /* relative= */ true, m->timeout_usec); | |
877 | if (r < 0) | |
878 | return r; | |
879 | ||
880 | r = unit_set_exec_params(UNIT(m), &exec_params); | |
881 | if (r < 0) | |
882 | return r; | |
883 | ||
884 | r = exec_spawn(UNIT(m), | |
885 | c, | |
886 | &m->exec_context, | |
887 | &exec_params, | |
888 | m->exec_runtime, | |
889 | &m->cgroup_context, | |
890 | &pidref); | |
891 | if (r < 0) | |
892 | return r; | |
893 | ||
894 | r = unit_watch_pidref(UNIT(m), &pidref, /* exclusive= */ true); | |
895 | if (r < 0) | |
896 | return r; | |
897 | ||
898 | *ret_pid = TAKE_PIDREF(pidref); | |
899 | return 0; | |
900 | } | |
901 | ||
902 | static void mount_enter_dead(Mount *m, MountResult f) { | |
903 | assert(m); | |
904 | ||
905 | if (m->result == MOUNT_SUCCESS) | |
906 | m->result = f; | |
907 | ||
908 | unit_log_result(UNIT(m), m->result == MOUNT_SUCCESS, mount_result_to_string(m->result)); | |
909 | unit_warn_leftover_processes(UNIT(m), unit_log_leftover_process_stop); | |
910 | ||
911 | mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD); | |
912 | ||
913 | m->exec_runtime = exec_runtime_destroy(m->exec_runtime); | |
914 | ||
915 | unit_destroy_runtime_data(UNIT(m), &m->exec_context); | |
916 | ||
917 | unit_unref_uid_gid(UNIT(m), true); | |
918 | ||
919 | /* Any dependencies based on /proc/self/mountinfo are now stale. Let's re-generate dependencies from | |
920 | * .mount unit. */ | |
921 | (void) mount_add_non_exec_dependencies(m); | |
922 | } | |
923 | ||
924 | static void mount_enter_mounted(Mount *m, MountResult f) { | |
925 | assert(m); | |
926 | ||
927 | if (m->result == MOUNT_SUCCESS) | |
928 | m->result = f; | |
929 | ||
930 | mount_set_state(m, MOUNT_MOUNTED); | |
931 | } | |
932 | ||
933 | static void mount_enter_dead_or_mounted(Mount *m, MountResult f) { | |
934 | assert(m); | |
935 | ||
936 | /* Enter DEAD or MOUNTED state, depending on what the kernel currently says about the mount point. We use this | |
937 | * whenever we executed an operation, so that our internal state reflects what the kernel says again, after all | |
938 | * ultimately we just mirror the kernel's internal state on this. */ | |
939 | ||
940 | if (m->from_proc_self_mountinfo) | |
941 | mount_enter_mounted(m, f); | |
942 | else | |
943 | mount_enter_dead(m, f); | |
944 | } | |
945 | ||
946 | static int state_to_kill_operation(MountState state) { | |
947 | switch (state) { | |
948 | ||
949 | case MOUNT_REMOUNTING_SIGTERM: | |
950 | return KILL_RESTART; | |
951 | ||
952 | case MOUNT_UNMOUNTING_SIGTERM: | |
953 | return KILL_TERMINATE; | |
954 | ||
955 | case MOUNT_REMOUNTING_SIGKILL: | |
956 | case MOUNT_UNMOUNTING_SIGKILL: | |
957 | return KILL_KILL; | |
958 | ||
959 | default: | |
960 | return _KILL_OPERATION_INVALID; | |
961 | } | |
962 | } | |
963 | ||
964 | static void mount_enter_signal(Mount *m, MountState state, MountResult f) { | |
965 | int r; | |
966 | ||
967 | assert(m); | |
968 | ||
969 | if (m->result == MOUNT_SUCCESS) | |
970 | m->result = f; | |
971 | ||
972 | r = unit_kill_context(UNIT(m), state_to_kill_operation(state)); | |
973 | if (r < 0) { | |
974 | log_unit_warning_errno(UNIT(m), r, "Failed to kill processes: %m"); | |
975 | goto fail; | |
976 | } | |
977 | ||
978 | if (r > 0) { | |
979 | r = mount_arm_timer(m, /* relative= */ true, m->timeout_usec); | |
980 | if (r < 0) { | |
981 | log_unit_warning_errno(UNIT(m), r, "Failed to install timer: %m"); | |
982 | goto fail; | |
983 | } | |
984 | ||
985 | mount_set_state(m, state); | |
986 | } else if (state == MOUNT_REMOUNTING_SIGTERM && m->kill_context.send_sigkill) | |
987 | mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS); | |
988 | else if (IN_SET(state, MOUNT_REMOUNTING_SIGTERM, MOUNT_REMOUNTING_SIGKILL)) | |
989 | mount_enter_mounted(m, MOUNT_SUCCESS); | |
990 | else if (state == MOUNT_UNMOUNTING_SIGTERM && m->kill_context.send_sigkill) | |
991 | mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS); | |
992 | else | |
993 | mount_enter_dead_or_mounted(m, MOUNT_SUCCESS); | |
994 | ||
995 | return; | |
996 | ||
997 | fail: | |
998 | mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES); | |
999 | } | |
1000 | ||
1001 | static int mount_set_umount_command(Mount *m, ExecCommand *c) { | |
1002 | int r; | |
1003 | ||
1004 | assert(m); | |
1005 | assert(c); | |
1006 | ||
1007 | r = exec_command_set(c, UMOUNT_PATH, m->where, "-c", NULL); | |
1008 | if (r < 0) | |
1009 | return r; | |
1010 | ||
1011 | if (m->lazy_unmount) { | |
1012 | r = exec_command_append(c, "-l", NULL); | |
1013 | if (r < 0) | |
1014 | return r; | |
1015 | } | |
1016 | ||
1017 | if (m->force_unmount) { | |
1018 | r = exec_command_append(c, "-f", NULL); | |
1019 | if (r < 0) | |
1020 | return r; | |
1021 | } | |
1022 | ||
1023 | return 0; | |
1024 | } | |
1025 | ||
1026 | static void mount_enter_unmounting(Mount *m) { | |
1027 | int r; | |
1028 | ||
1029 | assert(m); | |
1030 | ||
1031 | /* Start counting our attempts */ | |
1032 | if (!IN_SET(m->state, | |
1033 | MOUNT_UNMOUNTING, | |
1034 | MOUNT_UNMOUNTING_SIGTERM, | |
1035 | MOUNT_UNMOUNTING_SIGKILL)) | |
1036 | m->n_retry_umount = 0; | |
1037 | ||
1038 | m->control_command_id = MOUNT_EXEC_UNMOUNT; | |
1039 | m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT; | |
1040 | ||
1041 | r = mount_set_umount_command(m, m->control_command); | |
1042 | if (r < 0) { | |
1043 | log_unit_warning_errno(UNIT(m), r, "Failed to prepare umount command line: %m"); | |
1044 | goto fail; | |
1045 | } | |
1046 | ||
1047 | mount_unwatch_control_pid(m); | |
1048 | ||
1049 | r = mount_spawn(m, m->control_command, &m->control_pid); | |
1050 | if (r < 0) { | |
1051 | log_unit_warning_errno(UNIT(m), r, "Failed to spawn 'umount' task: %m"); | |
1052 | goto fail; | |
1053 | } | |
1054 | ||
1055 | mount_set_state(m, MOUNT_UNMOUNTING); | |
1056 | ||
1057 | return; | |
1058 | ||
1059 | fail: | |
1060 | mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES); | |
1061 | } | |
1062 | ||
1063 | static int mount_set_mount_command(Mount *m, ExecCommand *c, const MountParameters *p) { | |
1064 | int r; | |
1065 | ||
1066 | assert(m); | |
1067 | assert(c); | |
1068 | assert(p); | |
1069 | ||
1070 | r = exec_command_set(c, MOUNT_PATH, p->what, m->where, NULL); | |
1071 | if (r < 0) | |
1072 | return r; | |
1073 | ||
1074 | if (m->sloppy_options) { | |
1075 | r = exec_command_append(c, "-s", NULL); | |
1076 | if (r < 0) | |
1077 | return r; | |
1078 | } | |
1079 | ||
1080 | if (m->read_write_only) { | |
1081 | r = exec_command_append(c, "-w", NULL); | |
1082 | if (r < 0) | |
1083 | return r; | |
1084 | } | |
1085 | ||
1086 | if (p->fstype) { | |
1087 | r = exec_command_append(c, "-t", p->fstype, NULL); | |
1088 | if (r < 0) | |
1089 | return r; | |
1090 | } | |
1091 | ||
1092 | _cleanup_free_ char *opts = NULL; | |
1093 | r = fstab_filter_options(p->options, "nofail\0" "noauto\0" "auto\0", NULL, NULL, NULL, &opts); | |
1094 | if (r < 0) | |
1095 | return r; | |
1096 | ||
1097 | if (!isempty(opts)) { | |
1098 | r = exec_command_append(c, "-o", opts, NULL); | |
1099 | if (r < 0) | |
1100 | return r; | |
1101 | } | |
1102 | ||
1103 | return 0; | |
1104 | } | |
1105 | ||
1106 | static void mount_enter_mounting(Mount *m) { | |
1107 | MountParameters *p; | |
1108 | bool source_is_dir = true; | |
1109 | int r; | |
1110 | ||
1111 | assert(m); | |
1112 | ||
1113 | r = unit_fail_if_noncanonical(UNIT(m), m->where); | |
1114 | if (r < 0) | |
1115 | goto fail; | |
1116 | ||
1117 | p = get_mount_parameters_fragment(m); | |
1118 | if (p && mount_is_bind(p)) { | |
1119 | r = is_dir(p->what, /* follow = */ true); | |
1120 | if (r < 0 && r != -ENOENT) | |
1121 | log_unit_info_errno(UNIT(m), r, "Failed to determine type of bind mount source '%s', ignoring: %m", p->what); | |
1122 | else if (r == 0) | |
1123 | source_is_dir = false; | |
1124 | } | |
1125 | ||
1126 | if (source_is_dir) | |
1127 | r = mkdir_p_label(m->where, m->directory_mode); | |
1128 | else | |
1129 | r = touch_file(m->where, /* parents = */ true, USEC_INFINITY, UID_INVALID, GID_INVALID, MODE_INVALID); | |
1130 | if (r < 0 && r != -EEXIST) | |
1131 | log_unit_warning_errno(UNIT(m), r, "Failed to create mount point '%s', ignoring: %m", m->where); | |
1132 | ||
1133 | /* If we are asked to create an OverlayFS, create the upper/work directories if they are missing */ | |
1134 | if (p && streq_ptr(p->fstype, "overlay")) { | |
1135 | _cleanup_strv_free_ char **dirs = NULL; | |
1136 | ||
1137 | r = fstab_filter_options( | |
1138 | p->options, | |
1139 | "upperdir\0workdir\0", | |
1140 | /* ret_namefound= */ NULL, | |
1141 | /* ret_value= */ NULL, | |
1142 | &dirs, | |
1143 | /* ret_filtered= */ NULL); | |
1144 | if (r < 0) | |
1145 | log_unit_warning_errno( | |
1146 | UNIT(m), | |
1147 | r, | |
1148 | "Failed to determine upper directory for OverlayFS, ignoring: %m"); | |
1149 | else | |
1150 | STRV_FOREACH(d, dirs) { | |
1151 | r = mkdir_p_label(*d, m->directory_mode); | |
1152 | if (r < 0 && r != -EEXIST) | |
1153 | log_unit_warning_errno( | |
1154 | UNIT(m), | |
1155 | r, | |
1156 | "Failed to create overlay directory '%s', ignoring: %m", | |
1157 | *d); | |
1158 | } | |
1159 | } | |
1160 | ||
1161 | if (source_is_dir) | |
1162 | unit_warn_if_dir_nonempty(UNIT(m), m->where); | |
1163 | unit_warn_leftover_processes(UNIT(m), unit_log_leftover_process_start); | |
1164 | ||
1165 | m->control_command_id = MOUNT_EXEC_MOUNT; | |
1166 | m->control_command = m->exec_command + MOUNT_EXEC_MOUNT; | |
1167 | ||
1168 | /* Create the source directory for bind-mounts if needed */ | |
1169 | if (p && mount_is_bind(p)) { | |
1170 | r = mkdir_p_label(p->what, m->directory_mode); | |
1171 | /* mkdir_p_label() can return -EEXIST if the target path exists and is not a directory - which is | |
1172 | * totally OK, in case the user wants us to overmount a non-directory inode. Also -EROFS can be | |
1173 | * returned on read-only filesystem. Moreover, -EACCES (and also maybe -EPERM?) may be returned | |
1174 | * when the path is on NFS. See issue #24120. All such errors will be logged in the debug level. */ | |
1175 | if (r < 0 && r != -EEXIST) | |
1176 | log_unit_full_errno(UNIT(m), | |
1177 | (r == -EROFS || ERRNO_IS_PRIVILEGE(r)) ? LOG_DEBUG : LOG_WARNING, | |
1178 | r, "Failed to make bind mount source '%s', ignoring: %m", p->what); | |
1179 | } | |
1180 | ||
1181 | if (p) { | |
1182 | r = mount_set_mount_command(m, m->control_command, p); | |
1183 | if (r < 0) { | |
1184 | log_unit_warning_errno(UNIT(m), r, "Failed to prepare mount command line: %m"); | |
1185 | goto fail; | |
1186 | } | |
1187 | } else { | |
1188 | r = log_unit_warning_errno(UNIT(m), SYNTHETIC_ERRNO(ENOENT), "No mount parameters to operate on."); | |
1189 | goto fail; | |
1190 | } | |
1191 | ||
1192 | mount_unwatch_control_pid(m); | |
1193 | ||
1194 | r = mount_spawn(m, m->control_command, &m->control_pid); | |
1195 | if (r < 0) { | |
1196 | log_unit_warning_errno(UNIT(m), r, "Failed to spawn 'mount' task: %m"); | |
1197 | goto fail; | |
1198 | } | |
1199 | ||
1200 | mount_set_state(m, MOUNT_MOUNTING); | |
1201 | return; | |
1202 | ||
1203 | fail: | |
1204 | mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES); | |
1205 | } | |
1206 | ||
1207 | static void mount_set_reload_result(Mount *m, MountResult result) { | |
1208 | assert(m); | |
1209 | ||
1210 | /* Only store the first error we encounter */ | |
1211 | if (m->reload_result != MOUNT_SUCCESS) | |
1212 | return; | |
1213 | ||
1214 | m->reload_result = result; | |
1215 | } | |
1216 | ||
1217 | static void mount_enter_remounting(Mount *m) { | |
1218 | MountParameters *p; | |
1219 | int r; | |
1220 | ||
1221 | assert(m); | |
1222 | ||
1223 | /* Reset reload result when we are about to start a new remount operation */ | |
1224 | m->reload_result = MOUNT_SUCCESS; | |
1225 | ||
1226 | m->control_command_id = MOUNT_EXEC_REMOUNT; | |
1227 | m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT; | |
1228 | ||
1229 | p = get_mount_parameters_fragment(m); | |
1230 | if (p) { | |
1231 | const char *o; | |
1232 | ||
1233 | if (p->options) | |
1234 | o = strjoina("remount,", p->options); | |
1235 | else | |
1236 | o = "remount"; | |
1237 | ||
1238 | r = exec_command_set(m->control_command, MOUNT_PATH, | |
1239 | p->what, m->where, | |
1240 | "-o", o, NULL); | |
1241 | if (r >= 0 && m->sloppy_options) | |
1242 | r = exec_command_append(m->control_command, "-s", NULL); | |
1243 | if (r >= 0 && m->read_write_only) | |
1244 | r = exec_command_append(m->control_command, "-w", NULL); | |
1245 | if (r >= 0 && p->fstype) | |
1246 | r = exec_command_append(m->control_command, "-t", p->fstype, NULL); | |
1247 | if (r < 0) { | |
1248 | log_unit_warning_errno(UNIT(m), r, "Failed to prepare remount command line: %m"); | |
1249 | goto fail; | |
1250 | } | |
1251 | ||
1252 | } else { | |
1253 | r = log_unit_warning_errno(UNIT(m), SYNTHETIC_ERRNO(ENOENT), "No mount parameters to operate on."); | |
1254 | goto fail; | |
1255 | } | |
1256 | ||
1257 | mount_unwatch_control_pid(m); | |
1258 | ||
1259 | r = mount_spawn(m, m->control_command, &m->control_pid); | |
1260 | if (r < 0) { | |
1261 | log_unit_warning_errno(UNIT(m), r, "Failed to spawn 'remount' task: %m"); | |
1262 | goto fail; | |
1263 | } | |
1264 | ||
1265 | mount_set_state(m, MOUNT_REMOUNTING); | |
1266 | return; | |
1267 | ||
1268 | fail: | |
1269 | mount_set_reload_result(m, MOUNT_FAILURE_RESOURCES); | |
1270 | mount_enter_dead_or_mounted(m, MOUNT_SUCCESS); | |
1271 | } | |
1272 | ||
1273 | static void mount_cycle_clear(Mount *m) { | |
1274 | assert(m); | |
1275 | ||
1276 | /* Clear all state we shall forget for this new cycle */ | |
1277 | ||
1278 | m->result = MOUNT_SUCCESS; | |
1279 | m->reload_result = MOUNT_SUCCESS; | |
1280 | exec_command_reset_status_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX); | |
1281 | ||
1282 | if (m->cgroup_runtime) | |
1283 | m->cgroup_runtime->reset_accounting = true; | |
1284 | } | |
1285 | ||
1286 | static int mount_start(Unit *u) { | |
1287 | Mount *m = ASSERT_PTR(MOUNT(u)); | |
1288 | int r; | |
1289 | ||
1290 | /* We cannot fulfill this request right now, try again later | |
1291 | * please! */ | |
1292 | if (IN_SET(m->state, | |
1293 | MOUNT_UNMOUNTING, | |
1294 | MOUNT_UNMOUNTING_SIGTERM, | |
1295 | MOUNT_UNMOUNTING_SIGKILL, | |
1296 | MOUNT_CLEANING)) | |
1297 | return -EAGAIN; | |
1298 | ||
1299 | /* Already on it! */ | |
1300 | if (IN_SET(m->state, MOUNT_MOUNTING, MOUNT_MOUNTING_DONE)) | |
1301 | return 0; | |
1302 | ||
1303 | assert(IN_SET(m->state, MOUNT_DEAD, MOUNT_FAILED)); | |
1304 | ||
1305 | r = unit_acquire_invocation_id(u); | |
1306 | if (r < 0) | |
1307 | return r; | |
1308 | ||
1309 | mount_cycle_clear(m); | |
1310 | mount_enter_mounting(m); | |
1311 | ||
1312 | return 1; | |
1313 | } | |
1314 | ||
1315 | static int mount_stop(Unit *u) { | |
1316 | Mount *m = ASSERT_PTR(MOUNT(u)); | |
1317 | ||
1318 | /* When we directly call umount() for a path, then the state of the corresponding mount unit may be | |
1319 | * outdated. Let's re-read mountinfo now and update the state. */ | |
1320 | if (m->invalidated_state) | |
1321 | (void) mount_process_proc_self_mountinfo(u->manager); | |
1322 | ||
1323 | switch (m->state) { | |
1324 | ||
1325 | case MOUNT_UNMOUNTING: | |
1326 | case MOUNT_UNMOUNTING_SIGKILL: | |
1327 | case MOUNT_UNMOUNTING_SIGTERM: | |
1328 | /* Already on it */ | |
1329 | return 0; | |
1330 | ||
1331 | case MOUNT_MOUNTING: | |
1332 | case MOUNT_MOUNTING_DONE: | |
1333 | case MOUNT_REMOUNTING: | |
1334 | /* If we are still waiting for /bin/mount, we go directly into kill mode. */ | |
1335 | mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_SUCCESS); | |
1336 | return 0; | |
1337 | ||
1338 | case MOUNT_REMOUNTING_SIGTERM: | |
1339 | /* If we are already waiting for a hung remount, convert this to the matching unmounting state */ | |
1340 | mount_set_state(m, MOUNT_UNMOUNTING_SIGTERM); | |
1341 | return 0; | |
1342 | ||
1343 | case MOUNT_REMOUNTING_SIGKILL: | |
1344 | /* as above */ | |
1345 | mount_set_state(m, MOUNT_UNMOUNTING_SIGKILL); | |
1346 | return 0; | |
1347 | ||
1348 | case MOUNT_MOUNTED: | |
1349 | mount_enter_unmounting(m); | |
1350 | return 1; | |
1351 | ||
1352 | case MOUNT_CLEANING: | |
1353 | /* If we are currently cleaning, then abort it, brutally. */ | |
1354 | mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS); | |
1355 | return 0; | |
1356 | ||
1357 | case MOUNT_DEAD: | |
1358 | case MOUNT_FAILED: | |
1359 | /* The mount has just been unmounted by somebody else. */ | |
1360 | return 0; | |
1361 | ||
1362 | default: | |
1363 | assert_not_reached(); | |
1364 | } | |
1365 | } | |
1366 | ||
1367 | static int mount_reload(Unit *u) { | |
1368 | Mount *m = ASSERT_PTR(MOUNT(u)); | |
1369 | ||
1370 | assert(m->state == MOUNT_MOUNTED); | |
1371 | ||
1372 | mount_enter_remounting(m); | |
1373 | ||
1374 | return 1; | |
1375 | } | |
1376 | ||
1377 | static int mount_serialize(Unit *u, FILE *f, FDSet *fds) { | |
1378 | Mount *m = ASSERT_PTR(MOUNT(u)); | |
1379 | ||
1380 | assert(f); | |
1381 | assert(fds); | |
1382 | ||
1383 | (void) serialize_item(f, "state", mount_state_to_string(m->state)); | |
1384 | (void) serialize_item(f, "result", mount_result_to_string(m->result)); | |
1385 | (void) serialize_item(f, "reload-result", mount_result_to_string(m->reload_result)); | |
1386 | (void) serialize_item_format(f, "n-retry-umount", "%u", m->n_retry_umount); | |
1387 | (void) serialize_pidref(f, fds, "control-pid", &m->control_pid); | |
1388 | ||
1389 | if (m->control_command_id >= 0) | |
1390 | (void) serialize_item(f, "control-command", mount_exec_command_to_string(m->control_command_id)); | |
1391 | ||
1392 | return 0; | |
1393 | } | |
1394 | ||
1395 | static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
1396 | Mount *m = ASSERT_PTR(MOUNT(u)); | |
1397 | int r; | |
1398 | ||
1399 | assert(key); | |
1400 | assert(value); | |
1401 | assert(fds); | |
1402 | ||
1403 | if (streq(key, "state")) { | |
1404 | MountState state; | |
1405 | ||
1406 | state = mount_state_from_string(value); | |
1407 | if (state < 0) | |
1408 | log_unit_debug_errno(u, state, "Failed to parse state value: %s", value); | |
1409 | else | |
1410 | m->deserialized_state = state; | |
1411 | ||
1412 | } else if (streq(key, "result")) { | |
1413 | MountResult f; | |
1414 | ||
1415 | f = mount_result_from_string(value); | |
1416 | if (f < 0) | |
1417 | log_unit_debug_errno(u, f, "Failed to parse result value: %s", value); | |
1418 | else if (f != MOUNT_SUCCESS) | |
1419 | m->result = f; | |
1420 | ||
1421 | } else if (streq(key, "reload-result")) { | |
1422 | MountResult f; | |
1423 | ||
1424 | f = mount_result_from_string(value); | |
1425 | if (f < 0) | |
1426 | log_unit_debug_errno(u, f, "Failed to parse reload result value: %s", value); | |
1427 | else if (f != MOUNT_SUCCESS) | |
1428 | m->reload_result = f; | |
1429 | ||
1430 | } else if (streq(key, "n-retry-umount")) { | |
1431 | ||
1432 | r = safe_atou(value, &m->n_retry_umount); | |
1433 | if (r < 0) | |
1434 | log_unit_debug_errno(u, r, "Failed to parse n-retry-umount value: %s", value); | |
1435 | ||
1436 | } else if (streq(key, "control-pid")) { | |
1437 | ||
1438 | pidref_done(&m->control_pid); | |
1439 | (void) deserialize_pidref(fds, value, &m->control_pid); | |
1440 | ||
1441 | } else if (streq(key, "control-command")) { | |
1442 | MountExecCommand id; | |
1443 | ||
1444 | id = mount_exec_command_from_string(value); | |
1445 | if (id < 0) | |
1446 | log_unit_debug_errno(u, id, "Failed to parse exec-command value: %s", value); | |
1447 | else { | |
1448 | m->control_command_id = id; | |
1449 | m->control_command = m->exec_command + id; | |
1450 | } | |
1451 | } else | |
1452 | log_unit_debug(u, "Unknown serialization key: %s", key); | |
1453 | ||
1454 | return 0; | |
1455 | } | |
1456 | ||
1457 | static UnitActiveState mount_active_state(Unit *u) { | |
1458 | Mount *m = ASSERT_PTR(MOUNT(u)); | |
1459 | ||
1460 | return state_translation_table[m->state]; | |
1461 | } | |
1462 | ||
1463 | static const char *mount_sub_state_to_string(Unit *u) { | |
1464 | Mount *m = ASSERT_PTR(MOUNT(u)); | |
1465 | ||
1466 | return mount_state_to_string(m->state); | |
1467 | } | |
1468 | ||
1469 | static bool mount_may_gc(Unit *u) { | |
1470 | Mount *m = ASSERT_PTR(MOUNT(u)); | |
1471 | ||
1472 | if (m->from_proc_self_mountinfo) | |
1473 | return false; | |
1474 | ||
1475 | return true; | |
1476 | } | |
1477 | ||
1478 | static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) { | |
1479 | Mount *m = ASSERT_PTR(MOUNT(u)); | |
1480 | MountResult f; | |
1481 | ||
1482 | assert(pid >= 0); | |
1483 | ||
1484 | if (pid != m->control_pid.pid) | |
1485 | return; | |
1486 | ||
1487 | /* So here's the thing, we really want to know before /usr/bin/mount or /usr/bin/umount exit whether | |
1488 | * they established/remove a mount. This is important when mounting, but even more so when unmounting | |
1489 | * since we need to deal with nested mounts and otherwise cannot safely determine whether to repeat | |
1490 | * the unmounts. In theory, the kernel fires /proc/self/mountinfo changes off before returning from | |
1491 | * the mount() or umount() syscalls, and thus we should see the changes to the proc file before we | |
1492 | * process the waitid() for the /usr/bin/(u)mount processes. However, this is unfortunately racy: we | |
1493 | * have to waitid() for processes using P_ALL (since we need to reap unexpected children that got | |
1494 | * reparented to PID 1), but when using P_ALL we might end up reaping processes that terminated just | |
1495 | * instants ago, i.e. already after our last event loop iteration (i.e. after the last point we might | |
1496 | * have noticed /proc/self/mountinfo events via epoll). This means event loop priorities for | |
1497 | * processing SIGCHLD vs. /proc/self/mountinfo IO events are not as relevant as we want. To fix that | |
1498 | * race, let's explicitly scan /proc/self/mountinfo before we start processing /usr/bin/(u)mount | |
1499 | * dying. It's ugly, but it makes our ordering systematic again, and makes sure we always see | |
1500 | * /proc/self/mountinfo changes before our mount/umount exits. */ | |
1501 | (void) mount_process_proc_self_mountinfo(u->manager); | |
1502 | ||
1503 | pidref_done(&m->control_pid); | |
1504 | ||
1505 | if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL)) | |
1506 | f = MOUNT_SUCCESS; | |
1507 | else if (code == CLD_EXITED) | |
1508 | f = MOUNT_FAILURE_EXIT_CODE; | |
1509 | else if (code == CLD_KILLED) | |
1510 | f = MOUNT_FAILURE_SIGNAL; | |
1511 | else if (code == CLD_DUMPED) | |
1512 | f = MOUNT_FAILURE_CORE_DUMP; | |
1513 | else | |
1514 | assert_not_reached(); | |
1515 | ||
1516 | if (IN_SET(m->state, MOUNT_REMOUNTING, MOUNT_REMOUNTING_SIGKILL, MOUNT_REMOUNTING_SIGTERM)) | |
1517 | mount_set_reload_result(m, f); | |
1518 | else if (m->result == MOUNT_SUCCESS && !IN_SET(m->state, MOUNT_MOUNTING, MOUNT_UNMOUNTING)) | |
1519 | /* MOUNT_MOUNTING and MOUNT_UNMOUNTING states need to be patched, see below. */ | |
1520 | m->result = f; | |
1521 | ||
1522 | if (m->control_command) { | |
1523 | exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status); | |
1524 | ||
1525 | m->control_command = NULL; | |
1526 | m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; | |
1527 | } | |
1528 | ||
1529 | unit_log_process_exit( | |
1530 | u, | |
1531 | "Mount process", | |
1532 | mount_exec_command_to_string(m->control_command_id), | |
1533 | f == MOUNT_SUCCESS, | |
1534 | code, status); | |
1535 | ||
1536 | /* Note that due to the io event priority logic, we can be sure the new mountinfo is loaded | |
1537 | * before we process the SIGCHLD for the mount command. */ | |
1538 | ||
1539 | switch (m->state) { | |
1540 | ||
1541 | case MOUNT_MOUNTING: | |
1542 | /* Our mount point has not appeared in mountinfo. Something went wrong. */ | |
1543 | ||
1544 | if (f == MOUNT_SUCCESS) { | |
1545 | /* Either /bin/mount has an unexpected definition of success, or someone raced us | |
1546 | * and we lost. */ | |
1547 | log_unit_warning(UNIT(m), "Mount process finished, but there is no mount."); | |
1548 | f = MOUNT_FAILURE_PROTOCOL; | |
1549 | } | |
1550 | mount_enter_dead(m, f); | |
1551 | break; | |
1552 | ||
1553 | case MOUNT_MOUNTING_DONE: | |
1554 | mount_enter_mounted(m, f); | |
1555 | break; | |
1556 | ||
1557 | case MOUNT_REMOUNTING: | |
1558 | case MOUNT_REMOUNTING_SIGTERM: | |
1559 | case MOUNT_REMOUNTING_SIGKILL: | |
1560 | mount_enter_dead_or_mounted(m, MOUNT_SUCCESS); | |
1561 | break; | |
1562 | ||
1563 | case MOUNT_UNMOUNTING: | |
1564 | if (f == MOUNT_SUCCESS && m->from_proc_self_mountinfo) { | |
1565 | /* Still a mount point? If so, let's try again. Most likely there were multiple mount points | |
1566 | * stacked on top of each other. We might exceed the timeout specified by the user overall, | |
1567 | * but we will stop as soon as any one umount times out. */ | |
1568 | ||
1569 | if (m->n_retry_umount < RETRY_UMOUNT_MAX) { | |
1570 | log_unit_debug(u, "Mount still present, trying again."); | |
1571 | m->n_retry_umount++; | |
1572 | mount_enter_unmounting(m); | |
1573 | } else { | |
1574 | log_unit_warning(u, "Mount still present after %u attempts to unmount, giving up.", m->n_retry_umount); | |
1575 | mount_enter_mounted(m, f); | |
1576 | } | |
1577 | } else if (f == MOUNT_FAILURE_EXIT_CODE && !m->from_proc_self_mountinfo) { | |
1578 | /* Hmm, umount process spawned by us failed, but the mount disappeared anyway? | |
1579 | * Maybe someone else is trying to unmount at the same time. */ | |
1580 | log_unit_notice(u, "Mount disappeared even though umount process failed, continuing."); | |
1581 | mount_enter_dead(m, MOUNT_SUCCESS); | |
1582 | } else | |
1583 | mount_enter_dead_or_mounted(m, f); | |
1584 | ||
1585 | break; | |
1586 | ||
1587 | case MOUNT_UNMOUNTING_SIGTERM: | |
1588 | case MOUNT_UNMOUNTING_SIGKILL: | |
1589 | mount_enter_dead_or_mounted(m, f); | |
1590 | break; | |
1591 | ||
1592 | case MOUNT_CLEANING: | |
1593 | if (m->clean_result == MOUNT_SUCCESS) | |
1594 | m->clean_result = f; | |
1595 | ||
1596 | mount_enter_dead(m, MOUNT_SUCCESS); | |
1597 | break; | |
1598 | ||
1599 | default: | |
1600 | assert_not_reached(); | |
1601 | } | |
1602 | ||
1603 | /* Notify clients about changed exit status */ | |
1604 | unit_add_to_dbus_queue(u); | |
1605 | } | |
1606 | ||
1607 | static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) { | |
1608 | Mount *m = ASSERT_PTR(MOUNT(userdata)); | |
1609 | ||
1610 | assert(m->timer_event_source == source); | |
1611 | ||
1612 | switch (m->state) { | |
1613 | ||
1614 | case MOUNT_MOUNTING: | |
1615 | case MOUNT_MOUNTING_DONE: | |
1616 | log_unit_warning(UNIT(m), "Mounting timed out. Terminating."); | |
1617 | mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT); | |
1618 | break; | |
1619 | ||
1620 | case MOUNT_REMOUNTING: | |
1621 | log_unit_warning(UNIT(m), "Remounting timed out. Terminating remount process."); | |
1622 | mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT); | |
1623 | mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, MOUNT_SUCCESS); | |
1624 | break; | |
1625 | ||
1626 | case MOUNT_REMOUNTING_SIGTERM: | |
1627 | mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT); | |
1628 | ||
1629 | if (m->kill_context.send_sigkill) { | |
1630 | log_unit_warning(UNIT(m), "Remounting timed out. Killing."); | |
1631 | mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS); | |
1632 | } else { | |
1633 | log_unit_warning(UNIT(m), "Remounting timed out. Skipping SIGKILL. Ignoring."); | |
1634 | mount_enter_dead_or_mounted(m, MOUNT_SUCCESS); | |
1635 | } | |
1636 | break; | |
1637 | ||
1638 | case MOUNT_REMOUNTING_SIGKILL: | |
1639 | mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT); | |
1640 | ||
1641 | log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring."); | |
1642 | mount_enter_dead_or_mounted(m, MOUNT_SUCCESS); | |
1643 | break; | |
1644 | ||
1645 | case MOUNT_UNMOUNTING: | |
1646 | log_unit_warning(UNIT(m), "Unmounting timed out. Terminating."); | |
1647 | mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT); | |
1648 | break; | |
1649 | ||
1650 | case MOUNT_UNMOUNTING_SIGTERM: | |
1651 | if (m->kill_context.send_sigkill) { | |
1652 | log_unit_warning(UNIT(m), "Mount process timed out. Killing."); | |
1653 | mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT); | |
1654 | } else { | |
1655 | log_unit_warning(UNIT(m), "Mount process timed out. Skipping SIGKILL. Ignoring."); | |
1656 | mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT); | |
1657 | } | |
1658 | break; | |
1659 | ||
1660 | case MOUNT_UNMOUNTING_SIGKILL: | |
1661 | log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring."); | |
1662 | mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT); | |
1663 | break; | |
1664 | ||
1665 | case MOUNT_CLEANING: | |
1666 | log_unit_warning(UNIT(m), "Cleaning timed out. killing."); | |
1667 | ||
1668 | if (m->clean_result == MOUNT_SUCCESS) | |
1669 | m->clean_result = MOUNT_FAILURE_TIMEOUT; | |
1670 | ||
1671 | mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, 0); | |
1672 | break; | |
1673 | ||
1674 | default: | |
1675 | assert_not_reached(); | |
1676 | } | |
1677 | ||
1678 | return 0; | |
1679 | } | |
1680 | ||
1681 | static int mount_setup_new_unit( | |
1682 | Manager *m, | |
1683 | const char *name, | |
1684 | const char *what, | |
1685 | const char *where, | |
1686 | const char *options, | |
1687 | const char *fstype, | |
1688 | MountProcFlags *ret_flags, | |
1689 | Unit **ret) { | |
1690 | ||
1691 | _cleanup_(unit_freep) Unit *u = NULL; | |
1692 | Mount *mnt; | |
1693 | int r; | |
1694 | ||
1695 | assert(m); | |
1696 | assert(name); | |
1697 | assert(ret_flags); | |
1698 | assert(ret); | |
1699 | ||
1700 | r = unit_new_for_name(m, sizeof(Mount), name, &u); | |
1701 | if (r < 0) | |
1702 | return r; | |
1703 | ||
1704 | mnt = ASSERT_PTR(MOUNT(u)); | |
1705 | ||
1706 | r = free_and_strdup(&u->source_path, "/proc/self/mountinfo"); | |
1707 | if (r < 0) | |
1708 | return r; | |
1709 | ||
1710 | r = free_and_strdup(&mnt->where, where); | |
1711 | if (r < 0) | |
1712 | return r; | |
1713 | ||
1714 | r = update_parameters_proc_self_mountinfo(mnt, what, options, fstype); | |
1715 | if (r < 0) | |
1716 | return r; | |
1717 | ||
1718 | /* This unit was generated because /proc/self/mountinfo reported it. Remember this, so that by the | |
1719 | * time we load the unit file for it (and thus add in extra deps right after) we know what source to | |
1720 | * attributes the deps to. */ | |
1721 | mnt->from_proc_self_mountinfo = true; | |
1722 | ||
1723 | r = mount_add_non_exec_dependencies(mnt); | |
1724 | if (r < 0) | |
1725 | return r; | |
1726 | ||
1727 | /* We have only allocated the stub now, let's enqueue this unit for loading now, so that everything | |
1728 | * else is loaded in now. */ | |
1729 | unit_add_to_load_queue(u); | |
1730 | ||
1731 | *ret_flags = MOUNT_PROC_IS_MOUNTED | MOUNT_PROC_JUST_MOUNTED | MOUNT_PROC_JUST_CHANGED; | |
1732 | *ret = TAKE_PTR(u); | |
1733 | return 0; | |
1734 | } | |
1735 | ||
1736 | static int mount_setup_existing_unit( | |
1737 | Unit *u, | |
1738 | const char *what, | |
1739 | const char *where, | |
1740 | const char *options, | |
1741 | const char *fstype, | |
1742 | MountProcFlags *ret_flags) { | |
1743 | ||
1744 | Mount *m = ASSERT_PTR(MOUNT(u)); | |
1745 | int r; | |
1746 | ||
1747 | assert(u); | |
1748 | assert(where); | |
1749 | assert(ret_flags); | |
1750 | ||
1751 | if (!m->where) { | |
1752 | m->where = strdup(where); | |
1753 | if (!m->where) | |
1754 | return -ENOMEM; | |
1755 | } | |
1756 | ||
1757 | /* In case we have multiple mounts established on the same mount point, let's merge flags set already | |
1758 | * for the current unit. Note that the flags field is reset on each iteration of reading | |
1759 | * /proc/self/mountinfo, hence we know for sure anything already set here is from the current | |
1760 | * iteration and thus worthy of taking into account. */ | |
1761 | MountProcFlags flags = m->proc_flags | MOUNT_PROC_IS_MOUNTED; | |
1762 | ||
1763 | r = update_parameters_proc_self_mountinfo(m, what, options, fstype); | |
1764 | if (r < 0) | |
1765 | return r; | |
1766 | if (r > 0) | |
1767 | flags |= MOUNT_PROC_JUST_CHANGED; | |
1768 | ||
1769 | /* There are two conditions when we consider a mount point just mounted: when we haven't seen it in | |
1770 | * /proc/self/mountinfo before or when MOUNT_MOUNTING is our current state. Why bother with the | |
1771 | * latter? Shouldn't that be covered by the former? No, during reload it is not because we might then | |
1772 | * encounter a new /proc/self/mountinfo in combination with an old mount unit state (since it stems | |
1773 | * from the serialized state), and need to catch up. Since we know that the MOUNT_MOUNTING state is | |
1774 | * reached when we wait for the mount to appear we hence can assume that if we are in it, we are | |
1775 | * actually seeing it established for the first time. */ | |
1776 | if (!m->from_proc_self_mountinfo || m->state == MOUNT_MOUNTING) | |
1777 | flags |= MOUNT_PROC_JUST_MOUNTED; | |
1778 | ||
1779 | m->from_proc_self_mountinfo = true; | |
1780 | ||
1781 | if (UNIT_IS_LOAD_ERROR(u->load_state)) { | |
1782 | /* The unit was previously not found or otherwise not loaded. Now that the unit shows up in | |
1783 | * /proc/self/mountinfo we should reconsider it this, hence set it to UNIT_LOADED. */ | |
1784 | u->load_state = UNIT_LOADED; | |
1785 | u->load_error = 0; | |
1786 | ||
1787 | flags |= MOUNT_PROC_JUST_CHANGED; | |
1788 | } | |
1789 | ||
1790 | if (FLAGS_SET(flags, MOUNT_PROC_JUST_CHANGED)) { | |
1791 | /* If things changed, then make sure that all deps are regenerated. Let's | |
1792 | * first remove all automatic deps, and then add in the new ones. */ | |
1793 | r = mount_add_non_exec_dependencies(m); | |
1794 | if (r < 0) | |
1795 | return r; | |
1796 | } | |
1797 | ||
1798 | *ret_flags = flags; | |
1799 | return 0; | |
1800 | } | |
1801 | ||
1802 | static int mount_setup_unit( | |
1803 | Manager *m, | |
1804 | const char *what, | |
1805 | const char *where, | |
1806 | const char *options, | |
1807 | const char *fstype, | |
1808 | bool set_flags) { | |
1809 | ||
1810 | _cleanup_free_ char *e = NULL; | |
1811 | MountProcFlags flags; | |
1812 | Unit *u; | |
1813 | int r; | |
1814 | ||
1815 | assert(m); | |
1816 | assert(what); | |
1817 | assert(where); | |
1818 | assert(options); | |
1819 | assert(fstype); | |
1820 | ||
1821 | /* Ignore API mount points. They should never be referenced in | |
1822 | * dependencies ever. */ | |
1823 | if (mount_point_is_api(where) || mount_point_ignore(where)) | |
1824 | return 0; | |
1825 | ||
1826 | if (streq(fstype, "autofs")) | |
1827 | return 0; | |
1828 | ||
1829 | /* probably some kind of swap, ignore */ | |
1830 | if (!is_path(where)) | |
1831 | return 0; | |
1832 | ||
1833 | r = unit_name_from_path(where, ".mount", &e); | |
1834 | if (r < 0) | |
1835 | return log_struct_errno( | |
1836 | LOG_WARNING, r, | |
1837 | "MESSAGE_ID=" SD_MESSAGE_MOUNT_POINT_PATH_NOT_SUITABLE_STR, | |
1838 | "MOUNT_POINT=%s", where, | |
1839 | LOG_MESSAGE("Failed to generate valid unit name from mount point path '%s', ignoring mount point: %m", | |
1840 | where)); | |
1841 | ||
1842 | u = manager_get_unit(m, e); | |
1843 | if (u) | |
1844 | r = mount_setup_existing_unit(u, what, where, options, fstype, &flags); | |
1845 | else | |
1846 | /* First time we see this mount point meaning that it's not been initiated by a mount unit | |
1847 | * but rather by the sysadmin having called mount(8) directly. */ | |
1848 | r = mount_setup_new_unit(m, e, what, where, options, fstype, &flags, &u); | |
1849 | if (r < 0) | |
1850 | return log_warning_errno(r, "Failed to set up mount unit for '%s': %m", where); | |
1851 | ||
1852 | /* If the mount changed properties or state, let's notify our clients */ | |
1853 | if (flags & (MOUNT_PROC_JUST_CHANGED|MOUNT_PROC_JUST_MOUNTED)) | |
1854 | unit_add_to_dbus_queue(u); | |
1855 | ||
1856 | if (set_flags) | |
1857 | MOUNT(u)->proc_flags = flags; | |
1858 | ||
1859 | return 0; | |
1860 | } | |
1861 | ||
1862 | static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) { | |
1863 | _cleanup_(mnt_free_tablep) struct libmnt_table *table = NULL; | |
1864 | _cleanup_(mnt_free_iterp) struct libmnt_iter *iter = NULL; | |
1865 | int r; | |
1866 | ||
1867 | assert(m); | |
1868 | ||
1869 | r = libmount_parse(NULL, NULL, &table, &iter); | |
1870 | if (r < 0) | |
1871 | return log_error_errno(r, "Failed to parse /proc/self/mountinfo: %m"); | |
1872 | ||
1873 | for (;;) { | |
1874 | struct libmnt_fs *fs; | |
1875 | const char *device, *path, *options, *fstype; | |
1876 | ||
1877 | r = mnt_table_next_fs(table, iter, &fs); | |
1878 | if (r == 1) | |
1879 | break; | |
1880 | if (r < 0) | |
1881 | return log_error_errno(r, "Failed to get next entry from /proc/self/mountinfo: %m"); | |
1882 | ||
1883 | device = mnt_fs_get_source(fs); | |
1884 | path = mnt_fs_get_target(fs); | |
1885 | options = mnt_fs_get_options(fs); | |
1886 | fstype = mnt_fs_get_fstype(fs); | |
1887 | ||
1888 | if (!device || !path) | |
1889 | continue; | |
1890 | ||
1891 | device_found_node(m, device, DEVICE_FOUND_MOUNT, DEVICE_FOUND_MOUNT); | |
1892 | ||
1893 | (void) mount_setup_unit(m, device, path, options, fstype, set_flags); | |
1894 | } | |
1895 | ||
1896 | return 0; | |
1897 | } | |
1898 | ||
1899 | static void mount_shutdown(Manager *m) { | |
1900 | assert(m); | |
1901 | ||
1902 | m->mount_event_source = sd_event_source_disable_unref(m->mount_event_source); | |
1903 | ||
1904 | mnt_unref_monitor(m->mount_monitor); | |
1905 | m->mount_monitor = NULL; | |
1906 | } | |
1907 | ||
1908 | static int mount_get_timeout(Unit *u, usec_t *timeout) { | |
1909 | Mount *m = ASSERT_PTR(MOUNT(u)); | |
1910 | usec_t t; | |
1911 | int r; | |
1912 | ||
1913 | if (!m->timer_event_source) | |
1914 | return 0; | |
1915 | ||
1916 | r = sd_event_source_get_time(m->timer_event_source, &t); | |
1917 | if (r < 0) | |
1918 | return r; | |
1919 | if (t == USEC_INFINITY) | |
1920 | return 0; | |
1921 | ||
1922 | *timeout = t; | |
1923 | return 1; | |
1924 | } | |
1925 | ||
1926 | static void mount_enumerate_perpetual(Manager *m) { | |
1927 | Unit *u; | |
1928 | int r; | |
1929 | ||
1930 | assert(m); | |
1931 | ||
1932 | /* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's | |
1933 | * unconditionally synthesize it here and mark it as perpetual. */ | |
1934 | ||
1935 | u = manager_get_unit(m, SPECIAL_ROOT_MOUNT); | |
1936 | if (!u) { | |
1937 | r = unit_new_for_name(m, sizeof(Mount), SPECIAL_ROOT_MOUNT, &u); | |
1938 | if (r < 0) { | |
1939 | log_error_errno(r, "Failed to allocate the special " SPECIAL_ROOT_MOUNT " unit: %m"); | |
1940 | return; | |
1941 | } | |
1942 | } | |
1943 | ||
1944 | u->perpetual = true; | |
1945 | MOUNT(u)->deserialized_state = MOUNT_MOUNTED; | |
1946 | ||
1947 | unit_add_to_load_queue(u); | |
1948 | unit_add_to_dbus_queue(u); | |
1949 | } | |
1950 | ||
1951 | static bool mount_is_mounted(Mount *m) { | |
1952 | assert(m); | |
1953 | ||
1954 | return UNIT(m)->perpetual || FLAGS_SET(m->proc_flags, MOUNT_PROC_IS_MOUNTED); | |
1955 | } | |
1956 | ||
1957 | static int mount_on_ratelimit_expire(sd_event_source *s, void *userdata) { | |
1958 | Manager *m = ASSERT_PTR(userdata); | |
1959 | Job *j; | |
1960 | ||
1961 | /* Let's enqueue all start jobs that were previously skipped because of active ratelimit. */ | |
1962 | HASHMAP_FOREACH(j, m->jobs) { | |
1963 | if (j->unit->type != UNIT_MOUNT) | |
1964 | continue; | |
1965 | ||
1966 | job_add_to_run_queue(j); | |
1967 | } | |
1968 | ||
1969 | /* By entering ratelimited state we made all mount start jobs not runnable, now rate limit is over so | |
1970 | * let's make sure we dispatch them in the next iteration. */ | |
1971 | manager_trigger_run_queue(m); | |
1972 | ||
1973 | return 0; | |
1974 | } | |
1975 | ||
1976 | static void mount_enumerate(Manager *m) { | |
1977 | int r; | |
1978 | ||
1979 | assert(m); | |
1980 | ||
1981 | mnt_init_debug(0); | |
1982 | ||
1983 | if (!m->mount_monitor) { | |
1984 | unsigned mount_rate_limit_burst = 5; | |
1985 | int fd; | |
1986 | ||
1987 | m->mount_monitor = mnt_new_monitor(); | |
1988 | if (!m->mount_monitor) { | |
1989 | log_oom(); | |
1990 | goto fail; | |
1991 | } | |
1992 | ||
1993 | r = mnt_monitor_enable_kernel(m->mount_monitor, 1); | |
1994 | if (r < 0) { | |
1995 | log_error_errno(r, "Failed to enable watching of kernel mount events: %m"); | |
1996 | goto fail; | |
1997 | } | |
1998 | ||
1999 | r = mnt_monitor_enable_userspace(m->mount_monitor, 1, NULL); | |
2000 | if (r < 0) { | |
2001 | log_error_errno(r, "Failed to enable watching of userspace mount events: %m"); | |
2002 | goto fail; | |
2003 | } | |
2004 | ||
2005 | /* mnt_unref_monitor() will close the fd */ | |
2006 | fd = r = mnt_monitor_get_fd(m->mount_monitor); | |
2007 | if (r < 0) { | |
2008 | log_error_errno(r, "Failed to acquire watch file descriptor: %m"); | |
2009 | goto fail; | |
2010 | } | |
2011 | ||
2012 | r = sd_event_add_io(m->event, &m->mount_event_source, fd, EPOLLIN, mount_dispatch_io, m); | |
2013 | if (r < 0) { | |
2014 | log_error_errno(r, "Failed to watch mount file descriptor: %m"); | |
2015 | goto fail; | |
2016 | } | |
2017 | ||
2018 | r = sd_event_source_set_priority(m->mount_event_source, EVENT_PRIORITY_MOUNT_TABLE); | |
2019 | if (r < 0) { | |
2020 | log_error_errno(r, "Failed to adjust mount watch priority: %m"); | |
2021 | goto fail; | |
2022 | } | |
2023 | ||
2024 | /* Let users override the default (5 in 1s), as it stalls the boot sequence on busy systems. */ | |
2025 | const char *e = secure_getenv("SYSTEMD_DEFAULT_MOUNT_RATE_LIMIT_BURST"); | |
2026 | if (e) { | |
2027 | r = safe_atou(e, &mount_rate_limit_burst); | |
2028 | if (r < 0) | |
2029 | log_debug("Invalid value in $SYSTEMD_DEFAULT_MOUNT_RATE_LIMIT_BURST, ignoring: %s", e); | |
2030 | } | |
2031 | ||
2032 | r = sd_event_source_set_ratelimit(m->mount_event_source, 1 * USEC_PER_SEC, mount_rate_limit_burst); | |
2033 | if (r < 0) { | |
2034 | log_error_errno(r, "Failed to enable rate limit for mount events: %m"); | |
2035 | goto fail; | |
2036 | } | |
2037 | ||
2038 | r = sd_event_source_set_ratelimit_expire_callback(m->mount_event_source, mount_on_ratelimit_expire); | |
2039 | if (r < 0) { | |
2040 | log_error_errno(r, "Failed to enable rate limit for mount events: %m"); | |
2041 | goto fail; | |
2042 | } | |
2043 | ||
2044 | (void) sd_event_source_set_description(m->mount_event_source, "mount-monitor-dispatch"); | |
2045 | } | |
2046 | ||
2047 | r = mount_load_proc_self_mountinfo(m, false); | |
2048 | if (r < 0) | |
2049 | goto fail; | |
2050 | ||
2051 | return; | |
2052 | ||
2053 | fail: | |
2054 | mount_shutdown(m); | |
2055 | } | |
2056 | ||
2057 | static int drain_libmount(Manager *m) { | |
2058 | bool rescan = false; | |
2059 | int r; | |
2060 | ||
2061 | assert(m); | |
2062 | ||
2063 | /* Drain all events and verify that the event is valid. | |
2064 | * | |
2065 | * Note that libmount also monitors /run/mount mkdir if the directory does not exist yet. The mkdir | |
2066 | * may generate event which is irrelevant for us. | |
2067 | * | |
2068 | * error: r < 0; valid: r == 0, false positive: r == 1 */ | |
2069 | do { | |
2070 | r = mnt_monitor_next_change(m->mount_monitor, NULL, NULL); | |
2071 | if (r < 0) | |
2072 | return log_error_errno(r, "Failed to drain libmount events: %m"); | |
2073 | if (r == 0) | |
2074 | rescan = true; | |
2075 | } while (r == 0); | |
2076 | ||
2077 | return rescan; | |
2078 | } | |
2079 | ||
2080 | static int mount_process_proc_self_mountinfo(Manager *m) { | |
2081 | _cleanup_set_free_ Set *around = NULL, *gone = NULL; | |
2082 | const char *what; | |
2083 | int r; | |
2084 | ||
2085 | assert(m); | |
2086 | ||
2087 | r = drain_libmount(m); | |
2088 | if (r <= 0) | |
2089 | return r; | |
2090 | ||
2091 | r = mount_load_proc_self_mountinfo(m, true); | |
2092 | if (r < 0) { | |
2093 | /* Reset flags, just in case, for later calls */ | |
2094 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) | |
2095 | MOUNT(u)->proc_flags = 0; | |
2096 | ||
2097 | return 0; | |
2098 | } | |
2099 | ||
2100 | manager_dispatch_load_queue(m); | |
2101 | ||
2102 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) { | |
2103 | Mount *mount = MOUNT(u); | |
2104 | ||
2105 | mount->invalidated_state = false; | |
2106 | ||
2107 | if (!mount_is_mounted(mount)) { | |
2108 | ||
2109 | /* A mount point is not around right now. It might be gone, or might never have | |
2110 | * existed. */ | |
2111 | ||
2112 | if (mount->from_proc_self_mountinfo && | |
2113 | mount->parameters_proc_self_mountinfo.what) | |
2114 | /* Remember that this device might just have disappeared */ | |
2115 | if (set_put_strdup_full(&gone, &path_hash_ops_free, mount->parameters_proc_self_mountinfo.what) < 0) | |
2116 | log_oom(); /* we don't care too much about OOM here... */ | |
2117 | ||
2118 | mount->from_proc_self_mountinfo = false; | |
2119 | assert_se(update_parameters_proc_self_mountinfo(mount, NULL, NULL, NULL) >= 0); | |
2120 | ||
2121 | switch (mount->state) { | |
2122 | ||
2123 | case MOUNT_MOUNTED: | |
2124 | /* This has just been unmounted by somebody else, follow the state change. */ | |
2125 | mount_enter_dead(mount, MOUNT_SUCCESS); | |
2126 | break; | |
2127 | ||
2128 | case MOUNT_MOUNTING_DONE: | |
2129 | /* The mount command may add the corresponding proc mountinfo entry and | |
2130 | * then remove it because of an internal error. E.g., fuse.sshfs seems | |
2131 | * to do that when the connection fails. See #17617. To handle such the | |
2132 | * case, let's once set the state back to mounting. Then, the unit can | |
2133 | * correctly enter the failed state later in mount_sigchld_event(). */ | |
2134 | mount_set_state(mount, MOUNT_MOUNTING); | |
2135 | break; | |
2136 | ||
2137 | default: | |
2138 | break; | |
2139 | } | |
2140 | ||
2141 | } else if (mount->proc_flags & (MOUNT_PROC_JUST_MOUNTED|MOUNT_PROC_JUST_CHANGED)) { | |
2142 | ||
2143 | /* A mount point was added or changed */ | |
2144 | ||
2145 | switch (mount->state) { | |
2146 | ||
2147 | case MOUNT_DEAD: | |
2148 | case MOUNT_FAILED: | |
2149 | ||
2150 | /* This has just been mounted by somebody else, follow the state change, but let's | |
2151 | * generate a new invocation ID for this implicitly and automatically. */ | |
2152 | (void) unit_acquire_invocation_id(u); | |
2153 | mount_cycle_clear(mount); | |
2154 | mount_enter_mounted(mount, MOUNT_SUCCESS); | |
2155 | break; | |
2156 | ||
2157 | case MOUNT_MOUNTING: | |
2158 | mount_set_state(mount, MOUNT_MOUNTING_DONE); | |
2159 | break; | |
2160 | ||
2161 | default: | |
2162 | /* Nothing really changed, but let's issue an notification call nonetheless, | |
2163 | * in case somebody is waiting for this. (e.g. file system ro/rw | |
2164 | * remounts.) */ | |
2165 | mount_set_state(mount, mount->state); | |
2166 | break; | |
2167 | } | |
2168 | } | |
2169 | ||
2170 | if (mount_is_mounted(mount) && | |
2171 | mount->from_proc_self_mountinfo && | |
2172 | mount->parameters_proc_self_mountinfo.what) | |
2173 | /* Track devices currently used */ | |
2174 | if (set_put_strdup_full(&around, &path_hash_ops_free, mount->parameters_proc_self_mountinfo.what) < 0) | |
2175 | log_oom(); | |
2176 | ||
2177 | /* Reset the flags for later calls */ | |
2178 | mount->proc_flags = 0; | |
2179 | } | |
2180 | ||
2181 | SET_FOREACH(what, gone) { | |
2182 | if (set_contains(around, what)) | |
2183 | continue; | |
2184 | ||
2185 | /* Let the device units know that the device is no longer mounted */ | |
2186 | device_found_node(m, what, DEVICE_NOT_FOUND, DEVICE_FOUND_MOUNT); | |
2187 | } | |
2188 | ||
2189 | return 0; | |
2190 | } | |
2191 | ||
2192 | static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { | |
2193 | Manager *m = ASSERT_PTR(userdata); | |
2194 | ||
2195 | assert(revents & EPOLLIN); | |
2196 | ||
2197 | return mount_process_proc_self_mountinfo(m); | |
2198 | } | |
2199 | ||
2200 | int mount_invalidate_state_by_path(Manager *manager, const char *path) { | |
2201 | _cleanup_free_ char *name = NULL; | |
2202 | Unit *u; | |
2203 | int r; | |
2204 | ||
2205 | assert(manager); | |
2206 | assert(path); | |
2207 | ||
2208 | r = unit_name_from_path(path, ".mount", &name); | |
2209 | if (r < 0) | |
2210 | return log_debug_errno(r, "Failed to generate unit name from path \"%s\", ignoring: %m", path); | |
2211 | ||
2212 | u = manager_get_unit(manager, name); | |
2213 | if (!u) | |
2214 | return -ENOENT; | |
2215 | ||
2216 | MOUNT(u)->invalidated_state = true; | |
2217 | return 0; | |
2218 | } | |
2219 | ||
2220 | static void mount_reset_failed(Unit *u) { | |
2221 | Mount *m = MOUNT(u); | |
2222 | ||
2223 | assert(m); | |
2224 | ||
2225 | if (m->state == MOUNT_FAILED) | |
2226 | mount_set_state(m, MOUNT_DEAD); | |
2227 | ||
2228 | m->result = MOUNT_SUCCESS; | |
2229 | m->reload_result = MOUNT_SUCCESS; | |
2230 | m->clean_result = MOUNT_SUCCESS; | |
2231 | } | |
2232 | ||
2233 | static PidRef* mount_control_pid(Unit *u) { | |
2234 | return &ASSERT_PTR(MOUNT(u))->control_pid; | |
2235 | } | |
2236 | ||
2237 | static int mount_clean(Unit *u, ExecCleanMask mask) { | |
2238 | _cleanup_strv_free_ char **l = NULL; | |
2239 | Mount *m = MOUNT(u); | |
2240 | int r; | |
2241 | ||
2242 | assert(m); | |
2243 | assert(mask != 0); | |
2244 | ||
2245 | if (m->state != MOUNT_DEAD) | |
2246 | return -EBUSY; | |
2247 | ||
2248 | r = exec_context_get_clean_directories(&m->exec_context, u->manager->prefix, mask, &l); | |
2249 | if (r < 0) | |
2250 | return r; | |
2251 | ||
2252 | if (strv_isempty(l)) | |
2253 | return -EUNATCH; | |
2254 | ||
2255 | mount_unwatch_control_pid(m); | |
2256 | m->clean_result = MOUNT_SUCCESS; | |
2257 | m->control_command = NULL; | |
2258 | m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; | |
2259 | ||
2260 | r = mount_arm_timer(m, /* relative= */ true, m->exec_context.timeout_clean_usec); | |
2261 | if (r < 0) { | |
2262 | log_unit_warning_errno(u, r, "Failed to install timer: %m"); | |
2263 | goto fail; | |
2264 | } | |
2265 | ||
2266 | r = unit_fork_and_watch_rm_rf(u, l, &m->control_pid); | |
2267 | if (r < 0) { | |
2268 | log_unit_warning_errno(u, r, "Failed to spawn cleaning task: %m"); | |
2269 | goto fail; | |
2270 | } | |
2271 | ||
2272 | mount_set_state(m, MOUNT_CLEANING); | |
2273 | return 0; | |
2274 | ||
2275 | fail: | |
2276 | m->clean_result = MOUNT_FAILURE_RESOURCES; | |
2277 | m->timer_event_source = sd_event_source_disable_unref(m->timer_event_source); | |
2278 | return r; | |
2279 | } | |
2280 | ||
2281 | static int mount_can_clean(Unit *u, ExecCleanMask *ret) { | |
2282 | Mount *m = ASSERT_PTR(MOUNT(u)); | |
2283 | ||
2284 | return exec_context_get_clean_mask(&m->exec_context, ret); | |
2285 | } | |
2286 | ||
2287 | static int mount_can_start(Unit *u) { | |
2288 | Mount *m = ASSERT_PTR(MOUNT(u)); | |
2289 | int r; | |
2290 | ||
2291 | r = unit_test_start_limit(u); | |
2292 | if (r < 0) { | |
2293 | mount_enter_dead(m, MOUNT_FAILURE_START_LIMIT_HIT); | |
2294 | return r; | |
2295 | } | |
2296 | ||
2297 | return 1; | |
2298 | } | |
2299 | ||
2300 | static int mount_subsystem_ratelimited(Manager *m) { | |
2301 | assert(m); | |
2302 | ||
2303 | if (!m->mount_event_source) | |
2304 | return false; | |
2305 | ||
2306 | return sd_event_source_is_ratelimited(m->mount_event_source); | |
2307 | } | |
2308 | ||
2309 | char* mount_get_what_escaped(const Mount *m) { | |
2310 | _cleanup_free_ char *escaped = NULL; | |
2311 | const char *s = NULL; | |
2312 | ||
2313 | assert(m); | |
2314 | ||
2315 | if (m->from_proc_self_mountinfo && m->parameters_proc_self_mountinfo.what) | |
2316 | s = m->parameters_proc_self_mountinfo.what; | |
2317 | else if (m->from_fragment && m->parameters_fragment.what) | |
2318 | s = m->parameters_fragment.what; | |
2319 | ||
2320 | if (s) { | |
2321 | escaped = utf8_escape_invalid(s); | |
2322 | if (!escaped) | |
2323 | return NULL; | |
2324 | } | |
2325 | ||
2326 | return escaped ? TAKE_PTR(escaped) : strdup(""); | |
2327 | } | |
2328 | ||
2329 | char* mount_get_options_escaped(const Mount *m) { | |
2330 | _cleanup_free_ char *escaped = NULL; | |
2331 | const char *s = NULL; | |
2332 | ||
2333 | assert(m); | |
2334 | ||
2335 | if (m->from_proc_self_mountinfo && m->parameters_proc_self_mountinfo.options) | |
2336 | s = m->parameters_proc_self_mountinfo.options; | |
2337 | else if (m->from_fragment && m->parameters_fragment.options) | |
2338 | s = m->parameters_fragment.options; | |
2339 | ||
2340 | if (s) { | |
2341 | escaped = utf8_escape_invalid(s); | |
2342 | if (!escaped) | |
2343 | return NULL; | |
2344 | } | |
2345 | ||
2346 | return escaped ? TAKE_PTR(escaped) : strdup(""); | |
2347 | } | |
2348 | ||
2349 | const char* mount_get_fstype(const Mount *m) { | |
2350 | assert(m); | |
2351 | ||
2352 | if (m->from_proc_self_mountinfo && m->parameters_proc_self_mountinfo.fstype) | |
2353 | return m->parameters_proc_self_mountinfo.fstype; | |
2354 | ||
2355 | if (m->from_fragment && m->parameters_fragment.fstype) | |
2356 | return m->parameters_fragment.fstype; | |
2357 | ||
2358 | return NULL; | |
2359 | } | |
2360 | ||
2361 | static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = { | |
2362 | [MOUNT_EXEC_MOUNT] = "ExecMount", | |
2363 | [MOUNT_EXEC_UNMOUNT] = "ExecUnmount", | |
2364 | [MOUNT_EXEC_REMOUNT] = "ExecRemount", | |
2365 | }; | |
2366 | ||
2367 | DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand); | |
2368 | ||
2369 | static const char* const mount_result_table[_MOUNT_RESULT_MAX] = { | |
2370 | [MOUNT_SUCCESS] = "success", | |
2371 | [MOUNT_FAILURE_RESOURCES] = "resources", | |
2372 | [MOUNT_FAILURE_TIMEOUT] = "timeout", | |
2373 | [MOUNT_FAILURE_EXIT_CODE] = "exit-code", | |
2374 | [MOUNT_FAILURE_SIGNAL] = "signal", | |
2375 | [MOUNT_FAILURE_CORE_DUMP] = "core-dump", | |
2376 | [MOUNT_FAILURE_START_LIMIT_HIT] = "start-limit-hit", | |
2377 | [MOUNT_FAILURE_PROTOCOL] = "protocol", | |
2378 | }; | |
2379 | ||
2380 | DEFINE_STRING_TABLE_LOOKUP(mount_result, MountResult); | |
2381 | ||
2382 | const UnitVTable mount_vtable = { | |
2383 | .object_size = sizeof(Mount), | |
2384 | .exec_context_offset = offsetof(Mount, exec_context), | |
2385 | .cgroup_context_offset = offsetof(Mount, cgroup_context), | |
2386 | .kill_context_offset = offsetof(Mount, kill_context), | |
2387 | .exec_runtime_offset = offsetof(Mount, exec_runtime), | |
2388 | .cgroup_runtime_offset = offsetof(Mount, cgroup_runtime), | |
2389 | ||
2390 | .sections = | |
2391 | "Unit\0" | |
2392 | "Mount\0" | |
2393 | "Install\0", | |
2394 | .private_section = "Mount", | |
2395 | ||
2396 | .can_transient = true, | |
2397 | .can_fail = true, | |
2398 | .exclude_from_switch_root_serialization = true, | |
2399 | ||
2400 | .init = mount_init, | |
2401 | .load = mount_load, | |
2402 | .done = mount_done, | |
2403 | ||
2404 | .coldplug = mount_coldplug, | |
2405 | .catchup = mount_catchup, | |
2406 | ||
2407 | .dump = mount_dump, | |
2408 | ||
2409 | .start = mount_start, | |
2410 | .stop = mount_stop, | |
2411 | .reload = mount_reload, | |
2412 | ||
2413 | .clean = mount_clean, | |
2414 | .can_clean = mount_can_clean, | |
2415 | ||
2416 | .serialize = mount_serialize, | |
2417 | .deserialize_item = mount_deserialize_item, | |
2418 | ||
2419 | .active_state = mount_active_state, | |
2420 | .sub_state_to_string = mount_sub_state_to_string, | |
2421 | ||
2422 | .will_restart = unit_will_restart_default, | |
2423 | ||
2424 | .may_gc = mount_may_gc, | |
2425 | .is_extrinsic = mount_is_extrinsic, | |
2426 | ||
2427 | .sigchld_event = mount_sigchld_event, | |
2428 | ||
2429 | .reset_failed = mount_reset_failed, | |
2430 | ||
2431 | .control_pid = mount_control_pid, | |
2432 | ||
2433 | .bus_set_property = bus_mount_set_property, | |
2434 | .bus_commit_properties = bus_mount_commit_properties, | |
2435 | ||
2436 | .get_timeout = mount_get_timeout, | |
2437 | ||
2438 | .enumerate_perpetual = mount_enumerate_perpetual, | |
2439 | .enumerate = mount_enumerate, | |
2440 | .shutdown = mount_shutdown, | |
2441 | .subsystem_ratelimited = mount_subsystem_ratelimited, | |
2442 | ||
2443 | .status_message_formats = { | |
2444 | .starting_stopping = { | |
2445 | [0] = "Mounting %s...", | |
2446 | [1] = "Unmounting %s...", | |
2447 | }, | |
2448 | .finished_start_job = { | |
2449 | [JOB_DONE] = "Mounted %s.", | |
2450 | [JOB_FAILED] = "Failed to mount %s.", | |
2451 | [JOB_TIMEOUT] = "Timed out mounting %s.", | |
2452 | }, | |
2453 | .finished_stop_job = { | |
2454 | [JOB_DONE] = "Unmounted %s.", | |
2455 | [JOB_FAILED] = "Failed unmounting %s.", | |
2456 | [JOB_TIMEOUT] = "Timed out unmounting %s.", | |
2457 | }, | |
2458 | }, | |
2459 | ||
2460 | .can_start = mount_can_start, | |
2461 | ||
2462 | .notify_plymouth = true, | |
2463 | }; |