Branch data Line data Source code
1 : : /* SPDX-License-Identifier: LGPL-2.1+ */
2 : :
3 : : #include <errno.h>
4 : : #include <signal.h>
5 : : #include <stdio.h>
6 : : #include <sys/epoll.h>
7 : :
8 : : #include "sd-messages.h"
9 : :
10 : : #include "alloc-util.h"
11 : : #include "dbus-mount.h"
12 : : #include "dbus-unit.h"
13 : : #include "device.h"
14 : : #include "exit-status.h"
15 : : #include "format-util.h"
16 : : #include "fstab-util.h"
17 : : #include "libmount-util.h"
18 : : #include "log.h"
19 : : #include "manager.h"
20 : : #include "mkdir.h"
21 : : #include "mount-setup.h"
22 : : #include "mount.h"
23 : : #include "mountpoint-util.h"
24 : : #include "parse-util.h"
25 : : #include "path-util.h"
26 : : #include "process-util.h"
27 : : #include "serialize.h"
28 : : #include "special.h"
29 : : #include "string-table.h"
30 : : #include "string-util.h"
31 : : #include "strv.h"
32 : : #include "unit-name.h"
33 : : #include "unit.h"
34 : :
35 : : #define RETRY_UMOUNT_MAX 32
36 : :
37 : : static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
38 : : [MOUNT_DEAD] = UNIT_INACTIVE,
39 : : [MOUNT_MOUNTING] = UNIT_ACTIVATING,
40 : : [MOUNT_MOUNTING_DONE] = UNIT_ACTIVATING,
41 : : [MOUNT_MOUNTED] = UNIT_ACTIVE,
42 : : [MOUNT_REMOUNTING] = UNIT_RELOADING,
43 : : [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
44 : : [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING,
45 : : [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING,
46 : : [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
47 : : [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
48 : : [MOUNT_FAILED] = UNIT_FAILED
49 : : };
50 : :
51 : : static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
52 : : static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
53 : : static int mount_process_proc_self_mountinfo(Manager *m);
54 : :
55 : 660 : static bool MOUNT_STATE_WITH_PROCESS(MountState state) {
56 [ - + ]: 660 : return IN_SET(state,
57 : : MOUNT_MOUNTING,
58 : : MOUNT_MOUNTING_DONE,
59 : : MOUNT_REMOUNTING,
60 : : MOUNT_REMOUNTING_SIGTERM,
61 : : MOUNT_REMOUNTING_SIGKILL,
62 : : MOUNT_UNMOUNTING,
63 : : MOUNT_UNMOUNTING_SIGTERM,
64 : : MOUNT_UNMOUNTING_SIGKILL);
65 : : }
66 : :
67 : 0 : static bool mount_is_network(const MountParameters *p) {
68 [ # # ]: 0 : assert(p);
69 : :
70 [ # # ]: 0 : if (fstab_test_option(p->options, "_netdev\0"))
71 : 0 : return true;
72 : :
73 [ # # # # ]: 0 : if (p->fstype && fstype_is_network(p->fstype))
74 : 0 : return true;
75 : :
76 : 0 : return false;
77 : : }
78 : :
79 : 0 : static bool mount_is_loop(const MountParameters *p) {
80 [ # # ]: 0 : assert(p);
81 : :
82 [ # # ]: 0 : if (fstab_test_option(p->options, "loop\0"))
83 : 0 : return true;
84 : :
85 : 0 : return false;
86 : : }
87 : :
88 : 704 : static bool mount_is_bind(const MountParameters *p) {
89 [ - + ]: 704 : assert(p);
90 : :
91 [ - + ]: 704 : if (fstab_test_option(p->options, "bind\0" "rbind\0"))
92 : 0 : return true;
93 : :
94 [ + - - + ]: 704 : if (p->fstype && STR_IN_SET(p->fstype, "bind", "rbind"))
95 : 0 : return true;
96 : :
97 : 704 : return false;
98 : : }
99 : :
100 : 132 : static bool mount_is_bound_to_device(const Mount *m) {
101 : : const MountParameters *p;
102 : :
103 [ - + ]: 132 : if (m->from_fragment)
104 : 0 : return true;
105 : :
106 : 132 : p = &m->parameters_proc_self_mountinfo;
107 : 132 : return fstab_test_option(p->options, "x-systemd.device-bound\0");
108 : : }
109 : :
110 : 0 : static bool mount_needs_quota(const MountParameters *p) {
111 [ # # ]: 0 : assert(p);
112 : :
113 : : /* Quotas are not enabled on network filesystems, but we want them, for example, on storage connected via
114 : : * iscsi. We hence don't use mount_is_network() here, as that would also return true for _netdev devices. */
115 [ # # # # ]: 0 : if (p->fstype && fstype_is_network(p->fstype))
116 : 0 : return false;
117 : :
118 [ # # ]: 0 : if (mount_is_bind(p))
119 : 0 : return false;
120 : :
121 : 0 : return fstab_test_option(p->options,
122 : : "usrquota\0" "grpquota\0" "quota\0" "usrjquota\0" "grpjquota\0");
123 : : }
124 : :
125 : 1788 : static void mount_init(Unit *u) {
126 : 1788 : Mount *m = MOUNT(u);
127 : :
128 [ - + ]: 1788 : assert(u);
129 [ - + ]: 1788 : assert(u->load_state == UNIT_STUB);
130 : :
131 : 1788 : m->timeout_usec = u->manager->default_timeout_start_usec;
132 : :
133 : 1788 : m->exec_context.std_output = u->manager->default_std_output;
134 : 1788 : m->exec_context.std_error = u->manager->default_std_error;
135 : :
136 : 1788 : m->directory_mode = 0755;
137 : :
138 : : /* We need to make sure that /usr/bin/mount is always called
139 : : * in the same process group as us, so that the autofs kernel
140 : : * side doesn't send us another mount request while we are
141 : : * already trying to comply its last one. */
142 : 1788 : m->exec_context.same_pgrp = true;
143 : :
144 : 1788 : m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
145 : :
146 : 1788 : u->ignore_on_isolate = true;
147 : 1788 : }
148 : :
149 : 0 : static int mount_arm_timer(Mount *m, usec_t usec) {
150 : : int r;
151 : :
152 [ # # ]: 0 : assert(m);
153 : :
154 [ # # ]: 0 : if (m->timer_event_source) {
155 : 0 : r = sd_event_source_set_time(m->timer_event_source, usec);
156 [ # # ]: 0 : if (r < 0)
157 : 0 : return r;
158 : :
159 : 0 : return sd_event_source_set_enabled(m->timer_event_source, SD_EVENT_ONESHOT);
160 : : }
161 : :
162 [ # # ]: 0 : if (usec == USEC_INFINITY)
163 : 0 : return 0;
164 : :
165 : 0 : r = sd_event_add_time(
166 [ # # ]: 0 : UNIT(m)->manager->event,
167 : : &m->timer_event_source,
168 : : CLOCK_MONOTONIC,
169 : : usec, 0,
170 : : mount_dispatch_timer, m);
171 [ # # ]: 0 : if (r < 0)
172 : 0 : return r;
173 : :
174 : 0 : (void) sd_event_source_set_description(m->timer_event_source, "mount-timer");
175 : :
176 : 0 : return 0;
177 : : }
178 : :
179 : 2448 : static void mount_unwatch_control_pid(Mount *m) {
180 [ - + ]: 2448 : assert(m);
181 : :
182 [ + - ]: 2448 : if (m->control_pid <= 0)
183 : 2448 : return;
184 : :
185 [ # # ]: 0 : unit_unwatch_pid(UNIT(m), m->control_pid);
186 : 0 : m->control_pid = 0;
187 : : }
188 : :
189 : 3576 : static void mount_parameters_done(MountParameters *p) {
190 [ - + ]: 3576 : assert(p);
191 : :
192 : 3576 : p->what = mfree(p->what);
193 : 3576 : p->options = mfree(p->options);
194 : 3576 : p->fstype = mfree(p->fstype);
195 : 3576 : }
196 : :
197 : 1788 : static void mount_done(Unit *u) {
198 : 1788 : Mount *m = MOUNT(u);
199 : :
200 [ - + ]: 1788 : assert(m);
201 : :
202 : 1788 : m->where = mfree(m->where);
203 : :
204 : 1788 : mount_parameters_done(&m->parameters_proc_self_mountinfo);
205 : 1788 : mount_parameters_done(&m->parameters_fragment);
206 : :
207 : 1788 : m->exec_runtime = exec_runtime_unref(m->exec_runtime, false);
208 : 1788 : exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
209 : 1788 : m->control_command = NULL;
210 : :
211 : 1788 : dynamic_creds_unref(&m->dynamic_creds);
212 : :
213 : 1788 : mount_unwatch_control_pid(m);
214 : :
215 : 1788 : m->timer_event_source = sd_event_source_unref(m->timer_event_source);
216 : 1788 : }
217 : :
218 : 1364 : _pure_ static MountParameters* get_mount_parameters_fragment(Mount *m) {
219 [ - + ]: 1364 : assert(m);
220 : :
221 [ - + ]: 1364 : if (m->from_fragment)
222 : 0 : return &m->parameters_fragment;
223 : :
224 : 1364 : return NULL;
225 : : }
226 : :
227 : 1064 : _pure_ static MountParameters* get_mount_parameters(Mount *m) {
228 [ - + ]: 1064 : assert(m);
229 : :
230 [ + - ]: 1064 : if (m->from_proc_self_mountinfo)
231 : 1064 : return &m->parameters_proc_self_mountinfo;
232 : :
233 : 0 : return get_mount_parameters_fragment(m);
234 : : }
235 : :
236 : 660 : static int update_parameters_proc_self_mountinfo(
237 : : Mount *m,
238 : : const char *what,
239 : : const char *options,
240 : : const char *fstype) {
241 : :
242 : : MountParameters *p;
243 : : int r, q, w;
244 : :
245 : 660 : p = &m->parameters_proc_self_mountinfo;
246 : :
247 : 660 : r = free_and_strdup(&p->what, what);
248 [ - + ]: 660 : if (r < 0)
249 : 0 : return r;
250 : :
251 : 660 : q = free_and_strdup(&p->options, options);
252 [ - + ]: 660 : if (q < 0)
253 : 0 : return q;
254 : :
255 : 660 : w = free_and_strdup(&p->fstype, fstype);
256 [ - + ]: 660 : if (w < 0)
257 : 0 : return w;
258 : :
259 [ - + # # : 660 : return r > 0 || q > 0 || w > 0;
# # ]
260 : : }
261 : :
262 : 704 : static int mount_add_mount_dependencies(Mount *m) {
263 : : MountParameters *pm;
264 : : Unit *other;
265 : : Iterator i;
266 : : Set *s;
267 : : int r;
268 : :
269 [ - + ]: 704 : assert(m);
270 : :
271 [ + + ]: 704 : if (!path_equal(m->where, "/")) {
272 [ + - ]: 616 : _cleanup_free_ char *parent = NULL;
273 : :
274 : : /* Adds in links to other mount points that might lie further up in the hierarchy */
275 : :
276 : 616 : parent = dirname_malloc(m->where);
277 [ - + ]: 616 : if (!parent)
278 : 0 : return -ENOMEM;
279 : :
280 [ + - ]: 616 : r = unit_require_mounts_for(UNIT(m), parent, UNIT_DEPENDENCY_IMPLICIT);
281 [ - + ]: 616 : if (r < 0)
282 : 0 : return r;
283 : : }
284 : :
285 : : /* Adds in dependencies to other mount points that might be needed for the source path (if this is a bind mount
286 : : * or a loop mount) to be available. */
287 : 704 : pm = get_mount_parameters_fragment(m);
288 [ - + # # ]: 704 : if (pm && pm->what &&
289 [ # # # # ]: 0 : path_is_absolute(pm->what) &&
290 [ # # # # ]: 0 : (mount_is_bind(pm) || mount_is_loop(pm) || !mount_is_network(pm))) {
291 : :
292 [ # # ]: 0 : r = unit_require_mounts_for(UNIT(m), pm->what, UNIT_DEPENDENCY_FILE);
293 [ # # ]: 0 : if (r < 0)
294 : 0 : return r;
295 : : }
296 : :
297 : : /* Adds in dependencies to other units that use this path or paths further down in the hierarchy */
298 [ + - ]: 704 : s = manager_get_units_requiring_mounts_for(UNIT(m)->manager, m->where);
299 [ + + ]: 1716 : SET_FOREACH(other, s, i) {
300 : :
301 [ - + ]: 1012 : if (other->load_state != UNIT_LOADED)
302 : 0 : continue;
303 : :
304 [ + - - + ]: 1012 : if (other == UNIT(m))
305 : 0 : continue;
306 : :
307 [ + - ]: 1012 : r = unit_add_dependency(other, UNIT_AFTER, UNIT(m), true, UNIT_DEPENDENCY_PATH);
308 [ - + ]: 1012 : if (r < 0)
309 : 0 : return r;
310 : :
311 [ + - - + ]: 1012 : if (UNIT(m)->fragment_path) {
312 : : /* If we have fragment configuration, then make this dependency required */
313 [ # # ]: 0 : r = unit_add_dependency(other, UNIT_REQUIRES, UNIT(m), true, UNIT_DEPENDENCY_PATH);
314 [ # # ]: 0 : if (r < 0)
315 : 0 : return r;
316 : : }
317 : : }
318 : :
319 : 704 : return 0;
320 : : }
321 : :
322 : 704 : static int mount_add_device_dependencies(Mount *m) {
323 : : UnitDependencyMask mask;
324 : : MountParameters *p;
325 : : UnitDependency dep;
326 : : int r;
327 : :
328 [ - + ]: 704 : assert(m);
329 : :
330 : 704 : p = get_mount_parameters(m);
331 [ - + ]: 704 : if (!p)
332 : 0 : return 0;
333 : :
334 [ - + ]: 704 : if (!p->what)
335 : 0 : return 0;
336 : :
337 [ - + ]: 704 : if (mount_is_bind(p))
338 : 0 : return 0;
339 : :
340 [ + + ]: 704 : if (!is_device_path(p->what))
341 : 484 : return 0;
342 : :
343 : : /* /dev/root is a really weird thing, it's not a real device,
344 : : * but just a path the kernel exports for the root file system
345 : : * specified on the kernel command line. Ignore it here. */
346 [ - + ]: 220 : if (path_equal(p->what, "/dev/root"))
347 : 0 : return 0;
348 : :
349 [ + + ]: 220 : if (path_equal(m->where, "/"))
350 : 88 : return 0;
351 : :
352 : : /* Mount units from /proc/self/mountinfo are not bound to devices
353 : : * by default since they're subject to races when devices are
354 : : * unplugged. But the user can still force this dep with an
355 : : * appropriate option (or udev property) so the mount units are
356 : : * automatically stopped when the device disappears suddenly. */
357 [ - + ]: 132 : dep = mount_is_bound_to_device(m) ? UNIT_BINDS_TO : UNIT_REQUIRES;
358 : :
359 : : /* We always use 'what' from /proc/self/mountinfo if mounted */
360 [ + - ]: 132 : mask = m->from_proc_self_mountinfo ? UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT : UNIT_DEPENDENCY_FILE;
361 : :
362 [ + - ]: 132 : r = unit_add_node_dependency(UNIT(m), p->what, false, dep, mask);
363 [ - + ]: 132 : if (r < 0)
364 : 0 : return r;
365 : :
366 : 132 : return 0;
367 : : }
368 : :
369 : 704 : static int mount_add_quota_dependencies(Mount *m) {
370 : : UnitDependencyMask mask;
371 : : MountParameters *p;
372 : : int r;
373 : :
374 [ - + ]: 704 : assert(m);
375 : :
376 [ + - + - ]: 704 : if (!MANAGER_IS_SYSTEM(UNIT(m)->manager))
377 : 704 : return 0;
378 : :
379 : 0 : p = get_mount_parameters_fragment(m);
380 [ # # ]: 0 : if (!p)
381 : 0 : return 0;
382 : :
383 [ # # ]: 0 : if (!mount_needs_quota(p))
384 : 0 : return 0;
385 : :
386 [ # # ]: 0 : mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT;
387 : :
388 [ # # ]: 0 : r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, true, mask);
389 [ # # ]: 0 : if (r < 0)
390 : 0 : return r;
391 : :
392 [ # # ]: 0 : r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, true, mask);
393 [ # # ]: 0 : if (r < 0)
394 : 0 : return r;
395 : :
396 : 0 : return 0;
397 : : }
398 : :
399 : 1020 : static bool mount_is_extrinsic(Mount *m) {
400 : : MountParameters *p;
401 [ - + ]: 1020 : assert(m);
402 : :
403 : : /* Returns true for all units that are "magic" and should be excluded from the usual start-up and shutdown
404 : : * dependencies. We call them "extrinsic" here, as they are generally mounted outside of the systemd dependency
405 : : * logic. We shouldn't attempt to manage them ourselves but it's fine if the user operates on them with us. */
406 : :
407 [ + - + - ]: 1020 : if (!MANAGER_IS_SYSTEM(UNIT(m)->manager)) /* We only automatically manage mounts if we are in system mode */
408 : 1020 : return true;
409 : :
410 [ # # # # : 0 : if (PATH_IN_SET(m->where, /* Don't bother with the OS data itself */
# # # # ]
411 : : "/",
412 : : "/usr"))
413 : 0 : return true;
414 : :
415 [ # # ]: 0 : if (PATH_STARTSWITH_SET(m->where,
416 : : "/run/initramfs", /* This should stay around from before we boot until after we shutdown */
417 : : "/proc", /* All of this is API VFS */
418 : : "/sys", /* … dito … */
419 : : "/dev")) /* … dito … */
420 : 0 : return true;
421 : :
422 : : /* If this is an initrd mount, and we are not in the initrd, then leave this around forever, too. */
423 : 0 : p = get_mount_parameters(m);
424 [ # # # # : 0 : if (p && fstab_test_option(p->options, "x-initrd.mount\0") && !in_initrd())
# # ]
425 : 0 : return true;
426 : :
427 : 0 : return false;
428 : : }
429 : :
430 : 704 : static int mount_add_default_dependencies(Mount *m) {
431 : : const char *after, *before;
432 : : UnitDependencyMask mask;
433 : : MountParameters *p;
434 : : bool nofail;
435 : : int r;
436 : :
437 [ - + ]: 704 : assert(m);
438 : :
439 [ + - + + ]: 704 : if (!UNIT(m)->default_dependencies)
440 : 44 : return 0;
441 : :
442 : : /* We do not add any default dependencies to /, /usr or /run/initramfs/, since they are guaranteed to stay
443 : : * mounted the whole time, since our system is on it. Also, don't bother with anything mounted below virtual
444 : : * file systems, it's also going to be virtual, and hence not worth the effort. */
445 [ + - ]: 660 : if (mount_is_extrinsic(m))
446 : 660 : return 0;
447 : :
448 : 0 : p = get_mount_parameters(m);
449 [ # # ]: 0 : if (!p)
450 : 0 : return 0;
451 : :
452 [ # # ]: 0 : mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_DEFAULT;
453 [ # # # # ]: 0 : nofail = m->from_fragment ? fstab_test_yes_no_option(m->parameters_fragment.options, "nofail\0" "fail\0") : false;
454 : :
455 [ # # ]: 0 : if (mount_is_network(p)) {
456 : : /* We order ourselves after network.target. This is
457 : : * primarily useful at shutdown: services that take
458 : : * down the network should order themselves before
459 : : * network.target, so that they are shut down only
460 : : * after this mount unit is stopped. */
461 : :
462 [ # # ]: 0 : r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_NETWORK_TARGET, true, mask);
463 [ # # ]: 0 : if (r < 0)
464 : 0 : return r;
465 : :
466 : : /* We pull in network-online.target, and order
467 : : * ourselves after it. This is useful at start-up to
468 : : * actively pull in tools that want to be started
469 : : * before we start mounting network file systems, and
470 : : * whose purpose it is to delay this until the network
471 : : * is "up". */
472 : :
473 [ # # ]: 0 : r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_WANTS, UNIT_AFTER, SPECIAL_NETWORK_ONLINE_TARGET, true, mask);
474 [ # # ]: 0 : if (r < 0)
475 : 0 : return r;
476 : :
477 : 0 : after = SPECIAL_REMOTE_FS_PRE_TARGET;
478 : 0 : before = SPECIAL_REMOTE_FS_TARGET;
479 : : } else {
480 : 0 : after = SPECIAL_LOCAL_FS_PRE_TARGET;
481 : 0 : before = SPECIAL_LOCAL_FS_TARGET;
482 : : }
483 : :
484 [ # # ]: 0 : if (!nofail) {
485 [ # # ]: 0 : r = unit_add_dependency_by_name(UNIT(m), UNIT_BEFORE, before, true, mask);
486 [ # # ]: 0 : if (r < 0)
487 : 0 : return r;
488 : : }
489 : :
490 [ # # ]: 0 : r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, true, mask);
491 [ # # ]: 0 : if (r < 0)
492 : 0 : return r;
493 : :
494 [ # # ]: 0 : r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, true, mask);
495 [ # # ]: 0 : if (r < 0)
496 : 0 : return r;
497 : :
498 : : /* If this is a tmpfs mount then we have to unmount it before we try to deactivate swaps */
499 [ # # ]: 0 : if (streq_ptr(p->fstype, "tmpfs")) {
500 [ # # ]: 0 : r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_SWAP_TARGET, true, mask);
501 [ # # ]: 0 : if (r < 0)
502 : 0 : return r;
503 : : }
504 : :
505 : 0 : return 0;
506 : : }
507 : :
508 : 660 : static int mount_verify(Mount *m) {
509 : 660 : _cleanup_free_ char *e = NULL;
510 : : MountParameters *p;
511 : : int r;
512 : :
513 [ - + ]: 660 : assert(m);
514 : :
515 [ + - - + ]: 660 : if (UNIT(m)->load_state != UNIT_LOADED)
516 : 0 : return 0;
517 : :
518 [ + - - + : 660 : if (!m->from_fragment && !m->from_proc_self_mountinfo && !UNIT(m)->perpetual)
# # # # ]
519 : 0 : return -ENOENT;
520 : :
521 : 660 : r = unit_name_from_path(m->where, ".mount", &e);
522 [ - + ]: 660 : if (r < 0)
523 [ # # # # ]: 0 : return log_unit_error_errno(UNIT(m), r, "Failed to generate unit name from mount path: %m");
524 : :
525 [ + - - + ]: 660 : if (!unit_has_name(UNIT(m), e)) {
526 [ # # # # ]: 0 : log_unit_error(UNIT(m), "Where= setting doesn't match unit name. Refusing.");
527 : 0 : return -ENOEXEC;
528 : : }
529 : :
530 [ + - - + ]: 660 : if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
531 [ # # # # ]: 0 : log_unit_error(UNIT(m), "Cannot create mount unit for API file system %s. Refusing.", m->where);
532 : 0 : return -ENOEXEC;
533 : : }
534 : :
535 : 660 : p = get_mount_parameters_fragment(m);
536 [ - + # # ]: 660 : if (p && !p->what) {
537 [ # # # # ]: 0 : log_unit_error(UNIT(m), "What= setting is missing. Refusing.");
538 : 0 : return -ENOEXEC;
539 : : }
540 : :
541 [ - + # # ]: 660 : if (m->exec_context.pam_name && m->kill_context.kill_mode != KILL_CONTROL_GROUP) {
542 [ # # # # ]: 0 : log_unit_error(UNIT(m), "Unit has PAM enabled. Kill mode must be set to control-group'. Refusing.");
543 : 0 : return -ENOEXEC;
544 : : }
545 : :
546 : 660 : return 0;
547 : : }
548 : :
549 : 704 : static int mount_add_extras(Mount *m) {
550 [ + - ]: 704 : Unit *u = UNIT(m);
551 : : int r;
552 : :
553 [ - + ]: 704 : assert(m);
554 : :
555 : : /* Note: this call might be called after we already have been loaded once (and even when it has already been
556 : : * activated), in case data from /proc/self/mountinfo has changed. This means all code here needs to be ready
557 : : * to run with an already set up unit. */
558 : :
559 [ - + ]: 704 : if (u->fragment_path)
560 : 0 : m->from_fragment = true;
561 : :
562 [ - + ]: 704 : if (!m->where) {
563 : 0 : r = unit_name_to_path(u->id, &m->where);
564 [ # # ]: 0 : if (r < 0)
565 : 0 : return r;
566 : : }
567 : :
568 : 704 : path_simplify(m->where, false);
569 : :
570 [ + + ]: 704 : if (!u->description) {
571 : 660 : r = unit_set_description(u, m->where);
572 [ - + ]: 660 : if (r < 0)
573 : 0 : return r;
574 : : }
575 : :
576 : 704 : r = mount_add_device_dependencies(m);
577 [ - + ]: 704 : if (r < 0)
578 : 0 : return r;
579 : :
580 : 704 : r = mount_add_mount_dependencies(m);
581 [ - + ]: 704 : if (r < 0)
582 : 0 : return r;
583 : :
584 : 704 : r = mount_add_quota_dependencies(m);
585 [ - + ]: 704 : if (r < 0)
586 : 0 : return r;
587 : :
588 : 704 : r = unit_patch_contexts(u);
589 [ - + ]: 704 : if (r < 0)
590 : 0 : return r;
591 : :
592 : 704 : r = unit_add_exec_dependencies(u, &m->exec_context);
593 [ - + ]: 704 : if (r < 0)
594 : 0 : return r;
595 : :
596 : 704 : r = unit_set_default_slice(u);
597 [ - + ]: 704 : if (r < 0)
598 : 0 : return r;
599 : :
600 : 704 : r = mount_add_default_dependencies(m);
601 [ - + ]: 704 : if (r < 0)
602 : 0 : return r;
603 : :
604 : 704 : return 0;
605 : : }
606 : :
607 : 1788 : static int mount_load_root_mount(Unit *u) {
608 [ - + ]: 1788 : assert(u);
609 : :
610 [ + + ]: 1788 : if (!unit_has_name(u, SPECIAL_ROOT_MOUNT))
611 : 1744 : return 0;
612 : :
613 : 44 : u->perpetual = true;
614 : 44 : u->default_dependencies = false;
615 : :
616 : : /* The stdio/kmsg bridge socket is on /, in order to avoid a dep loop, don't use kmsg logging for -.mount */
617 : 44 : MOUNT(u)->exec_context.std_output = EXEC_OUTPUT_NULL;
618 : 44 : MOUNT(u)->exec_context.std_input = EXEC_INPUT_NULL;
619 : :
620 [ - + ]: 44 : if (!u->description)
621 : 0 : u->description = strdup("Root Mount");
622 : :
623 : 44 : return 1;
624 : : }
625 : :
626 : 1788 : static int mount_load(Unit *u) {
627 : 1788 : Mount *m = MOUNT(u);
628 : : int r, q, w;
629 : :
630 [ - + ]: 1788 : assert(u);
631 [ - + ]: 1788 : assert(u->load_state == UNIT_STUB);
632 : :
633 : 1788 : r = mount_load_root_mount(u);
634 : :
635 [ + + - + ]: 1788 : if (m->from_proc_self_mountinfo || u->perpetual)
636 : 660 : q = unit_load_fragment_and_dropin_optional(u);
637 : : else
638 : 1128 : q = unit_load_fragment_and_dropin(u);
639 : :
640 : : /* Add in some extras. Note we do this in all cases (even if we failed to load the unit) when announced by the
641 : : * kernel, because we need some things to be set up no matter what when the kernel establishes a mount and thus
642 : : * we need to update the state in our unit to track it. After all, consider that we don't allow changing the
643 : : * 'slice' field for a unit once it is active. */
644 [ + + + - : 1788 : if (u->load_state == UNIT_LOADED || m->from_proc_self_mountinfo || u->perpetual)
- + ]
645 : 660 : w = mount_add_extras(m);
646 : : else
647 : 1128 : w = 0;
648 : :
649 [ - + ]: 1788 : if (r < 0)
650 : 0 : return r;
651 [ + + ]: 1788 : if (q < 0)
652 : 1128 : return q;
653 [ - + ]: 660 : if (w < 0)
654 : 0 : return w;
655 : :
656 : 660 : return mount_verify(m);
657 : : }
658 : :
659 : 660 : static void mount_set_state(Mount *m, MountState state) {
660 : : MountState old_state;
661 [ - + ]: 660 : assert(m);
662 : :
663 [ + - ]: 660 : if (m->state != state)
664 [ + - ]: 660 : bus_unit_send_pending_change_signal(UNIT(m), false);
665 : :
666 : 660 : old_state = m->state;
667 : 660 : m->state = state;
668 : :
669 [ + - ]: 660 : if (!MOUNT_STATE_WITH_PROCESS(state)) {
670 : 660 : m->timer_event_source = sd_event_source_unref(m->timer_event_source);
671 : 660 : mount_unwatch_control_pid(m);
672 : 660 : m->control_command = NULL;
673 : 660 : m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
674 : : }
675 : :
676 [ + - ]: 660 : if (state != old_state)
677 [ + - + - ]: 660 : log_unit_debug(UNIT(m), "Changed %s -> %s", mount_state_to_string(old_state), mount_state_to_string(state));
678 : :
679 : 660 : unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state],
680 [ + - ]: 660 : m->reload_result == MOUNT_SUCCESS ? 0 : UNIT_NOTIFY_RELOAD_FAILURE);
681 : 660 : }
682 : :
683 : 1716 : static int mount_coldplug(Unit *u) {
684 : 1716 : Mount *m = MOUNT(u);
685 : 1716 : MountState new_state = MOUNT_DEAD;
686 : : int r;
687 : :
688 [ - + ]: 1716 : assert(m);
689 [ - + ]: 1716 : assert(m->state == MOUNT_DEAD);
690 : :
691 [ + + ]: 1716 : if (m->deserialized_state != m->state)
692 : 44 : new_state = m->deserialized_state;
693 [ + + ]: 1672 : else if (m->from_proc_self_mountinfo)
694 : 616 : new_state = MOUNT_MOUNTED;
695 : :
696 [ + + ]: 1716 : if (new_state == m->state)
697 : 1056 : return 0;
698 : :
699 [ - + # # ]: 660 : if (m->control_pid > 0 &&
700 [ # # ]: 0 : pid_is_unwaited(m->control_pid) &&
701 : 0 : MOUNT_STATE_WITH_PROCESS(new_state)) {
702 : :
703 [ # # ]: 0 : r = unit_watch_pid(UNIT(m), m->control_pid, false);
704 [ # # ]: 0 : if (r < 0)
705 : 0 : return r;
706 : :
707 : 0 : r = mount_arm_timer(m, usec_add(u->state_change_timestamp.monotonic, m->timeout_usec));
708 [ # # ]: 0 : if (r < 0)
709 : 0 : return r;
710 : : }
711 : :
712 [ - + + - ]: 660 : if (!IN_SET(new_state, MOUNT_DEAD, MOUNT_FAILED)) {
713 : 660 : (void) unit_setup_dynamic_creds(u);
714 : 660 : (void) unit_setup_exec_runtime(u);
715 : : }
716 : :
717 : 660 : mount_set_state(m, new_state);
718 : 660 : return 0;
719 : : }
720 : :
721 : 360 : static void mount_dump(Unit *u, FILE *f, const char *prefix) {
722 : : char buf[FORMAT_TIMESPAN_MAX];
723 : 360 : Mount *m = MOUNT(u);
724 : : MountParameters *p;
725 : :
726 [ - + ]: 360 : assert(m);
727 [ - + ]: 360 : assert(f);
728 : :
729 : 360 : p = get_mount_parameters(m);
730 : :
731 [ + - + - : 2160 : fprintf(f,
+ - ]
732 : : "%sMount State: %s\n"
733 : : "%sResult: %s\n"
734 : : "%sWhere: %s\n"
735 : : "%sWhat: %s\n"
736 : : "%sFile System Type: %s\n"
737 : : "%sOptions: %s\n"
738 : : "%sFrom /proc/self/mountinfo: %s\n"
739 : : "%sFrom fragment: %s\n"
740 : : "%sExtrinsic: %s\n"
741 : : "%sDirectoryMode: %04o\n"
742 : : "%sSloppyOptions: %s\n"
743 : : "%sLazyUnmount: %s\n"
744 : : "%sForceUnmount: %s\n"
745 : : "%sTimeoutSec: %s\n",
746 : : prefix, mount_state_to_string(m->state),
747 : : prefix, mount_result_to_string(m->result),
748 : : prefix, m->where,
749 : 360 : prefix, p ? strna(p->what) : "n/a",
750 : 360 : prefix, p ? strna(p->fstype) : "n/a",
751 : 360 : prefix, p ? strna(p->options) : "n/a",
752 : 360 : prefix, yes_no(m->from_proc_self_mountinfo),
753 : 360 : prefix, yes_no(m->from_fragment),
754 : 360 : prefix, yes_no(mount_is_extrinsic(m)),
755 : : prefix, m->directory_mode,
756 : 360 : prefix, yes_no(m->sloppy_options),
757 : 360 : prefix, yes_no(m->lazy_unmount),
758 : 360 : prefix, yes_no(m->force_unmount),
759 : : prefix, format_timespan(buf, sizeof(buf), m->timeout_usec, USEC_PER_SEC));
760 : :
761 [ - + ]: 360 : if (m->control_pid > 0)
762 : 0 : fprintf(f,
763 : : "%sControl PID: "PID_FMT"\n",
764 : : prefix, m->control_pid);
765 : :
766 : 360 : exec_context_dump(&m->exec_context, f, prefix);
767 : 360 : kill_context_dump(&m->kill_context, f, prefix);
768 : 360 : cgroup_context_dump(&m->cgroup_context, f, prefix);
769 : 360 : }
770 : :
771 : 0 : static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
772 : :
773 : 0 : _cleanup_(exec_params_clear) ExecParameters exec_params = {
774 : : .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
775 : : .stdin_fd = -1,
776 : : .stdout_fd = -1,
777 : : .stderr_fd = -1,
778 : : .exec_fd = -1,
779 : : };
780 : : pid_t pid;
781 : : int r;
782 : :
783 [ # # ]: 0 : assert(m);
784 [ # # ]: 0 : assert(c);
785 [ # # ]: 0 : assert(_pid);
786 : :
787 [ # # ]: 0 : r = unit_prepare_exec(UNIT(m));
788 [ # # ]: 0 : if (r < 0)
789 : 0 : return r;
790 : :
791 : 0 : r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
792 [ # # ]: 0 : if (r < 0)
793 : 0 : return r;
794 : :
795 [ # # ]: 0 : r = unit_set_exec_params(UNIT(m), &exec_params);
796 [ # # ]: 0 : if (r < 0)
797 : 0 : return r;
798 : :
799 : 0 : r = exec_spawn(UNIT(m),
800 : : c,
801 [ # # ]: 0 : &m->exec_context,
802 : : &exec_params,
803 : : m->exec_runtime,
804 : : &m->dynamic_creds,
805 : : &pid);
806 [ # # ]: 0 : if (r < 0)
807 : 0 : return r;
808 : :
809 [ # # ]: 0 : r = unit_watch_pid(UNIT(m), pid, true);
810 [ # # ]: 0 : if (r < 0)
811 : 0 : return r;
812 : :
813 : 0 : *_pid = pid;
814 : :
815 : 0 : return 0;
816 : : }
817 : :
818 : 0 : static void mount_enter_dead(Mount *m, MountResult f) {
819 [ # # ]: 0 : assert(m);
820 : :
821 [ # # ]: 0 : if (m->result == MOUNT_SUCCESS)
822 : 0 : m->result = f;
823 : :
824 [ # # ]: 0 : unit_log_result(UNIT(m), m->result == MOUNT_SUCCESS, mount_result_to_string(m->result));
825 [ # # ]: 0 : mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD);
826 : :
827 : 0 : m->exec_runtime = exec_runtime_unref(m->exec_runtime, true);
828 : :
829 [ # # ]: 0 : exec_context_destroy_runtime_directory(&m->exec_context, UNIT(m)->manager->prefix[EXEC_DIRECTORY_RUNTIME]);
830 : :
831 [ # # ]: 0 : unit_unref_uid_gid(UNIT(m), true);
832 : :
833 : 0 : dynamic_creds_destroy(&m->dynamic_creds);
834 : :
835 : : /* Any dependencies based on /proc/self/mountinfo are now stale */
836 [ # # ]: 0 : unit_remove_dependencies(UNIT(m), UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
837 : 0 : }
838 : :
839 : 0 : static void mount_enter_mounted(Mount *m, MountResult f) {
840 [ # # ]: 0 : assert(m);
841 : :
842 [ # # ]: 0 : if (m->result == MOUNT_SUCCESS)
843 : 0 : m->result = f;
844 : :
845 : 0 : mount_set_state(m, MOUNT_MOUNTED);
846 : 0 : }
847 : :
848 : 0 : static void mount_enter_dead_or_mounted(Mount *m, MountResult f) {
849 [ # # ]: 0 : assert(m);
850 : :
851 : : /* Enter DEAD or MOUNTED state, depending on what the kernel currently says about the mount point. We use this
852 : : * whenever we executed an operation, so that our internal state reflects what the kernel says again, after all
853 : : * ultimately we just mirror the kernel's internal state on this. */
854 : :
855 [ # # ]: 0 : if (m->from_proc_self_mountinfo)
856 : 0 : mount_enter_mounted(m, f);
857 : : else
858 : 0 : mount_enter_dead(m, f);
859 : 0 : }
860 : :
861 : 0 : static int state_to_kill_operation(MountState state) {
862 [ # # # ]: 0 : switch (state) {
863 : :
864 : 0 : case MOUNT_REMOUNTING_SIGTERM:
865 : : case MOUNT_UNMOUNTING_SIGTERM:
866 : 0 : return KILL_TERMINATE;
867 : :
868 : 0 : case MOUNT_REMOUNTING_SIGKILL:
869 : : case MOUNT_UNMOUNTING_SIGKILL:
870 : 0 : return KILL_KILL;
871 : :
872 : 0 : default:
873 : 0 : return _KILL_OPERATION_INVALID;
874 : : }
875 : : }
876 : :
877 : 0 : static void mount_enter_signal(Mount *m, MountState state, MountResult f) {
878 : : int r;
879 : :
880 [ # # ]: 0 : assert(m);
881 : :
882 [ # # ]: 0 : if (m->result == MOUNT_SUCCESS)
883 : 0 : m->result = f;
884 : :
885 : 0 : r = unit_kill_context(
886 [ # # ]: 0 : UNIT(m),
887 : : &m->kill_context,
888 : 0 : state_to_kill_operation(state),
889 : : -1,
890 : : m->control_pid,
891 : : false);
892 [ # # ]: 0 : if (r < 0)
893 : 0 : goto fail;
894 : :
895 [ # # ]: 0 : if (r > 0) {
896 : 0 : r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
897 [ # # ]: 0 : if (r < 0)
898 : 0 : goto fail;
899 : :
900 : 0 : mount_set_state(m, state);
901 [ # # # # ]: 0 : } else if (state == MOUNT_REMOUNTING_SIGTERM && m->kill_context.send_sigkill)
902 : 0 : mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
903 [ # # # # ]: 0 : else if (IN_SET(state, MOUNT_REMOUNTING_SIGTERM, MOUNT_REMOUNTING_SIGKILL))
904 : 0 : mount_enter_mounted(m, MOUNT_SUCCESS);
905 [ # # # # ]: 0 : else if (state == MOUNT_UNMOUNTING_SIGTERM && m->kill_context.send_sigkill)
906 : 0 : mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS);
907 : : else
908 : 0 : mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
909 : :
910 : 0 : return;
911 : :
912 : 0 : fail:
913 [ # # # # ]: 0 : log_unit_warning_errno(UNIT(m), r, "Failed to kill processes: %m");
914 : 0 : mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
915 : : }
916 : :
917 : 0 : static void mount_enter_unmounting(Mount *m) {
918 : : int r;
919 : :
920 [ # # ]: 0 : assert(m);
921 : :
922 : : /* Start counting our attempts */
923 [ # # # # ]: 0 : if (!IN_SET(m->state,
924 : : MOUNT_UNMOUNTING,
925 : : MOUNT_UNMOUNTING_SIGTERM,
926 : : MOUNT_UNMOUNTING_SIGKILL))
927 : 0 : m->n_retry_umount = 0;
928 : :
929 : 0 : m->control_command_id = MOUNT_EXEC_UNMOUNT;
930 : 0 : m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
931 : :
932 : 0 : r = exec_command_set(m->control_command, UMOUNT_PATH, m->where, "-c", NULL);
933 [ # # # # ]: 0 : if (r >= 0 && m->lazy_unmount)
934 : 0 : r = exec_command_append(m->control_command, "-l", NULL);
935 [ # # # # ]: 0 : if (r >= 0 && m->force_unmount)
936 : 0 : r = exec_command_append(m->control_command, "-f", NULL);
937 [ # # ]: 0 : if (r < 0)
938 : 0 : goto fail;
939 : :
940 : 0 : mount_unwatch_control_pid(m);
941 : :
942 : 0 : r = mount_spawn(m, m->control_command, &m->control_pid);
943 [ # # ]: 0 : if (r < 0)
944 : 0 : goto fail;
945 : :
946 : 0 : mount_set_state(m, MOUNT_UNMOUNTING);
947 : :
948 : 0 : return;
949 : :
950 : 0 : fail:
951 [ # # # # ]: 0 : log_unit_warning_errno(UNIT(m), r, "Failed to run 'umount' task: %m");
952 : 0 : mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
953 : : }
954 : :
955 : 0 : static void mount_enter_mounting(Mount *m) {
956 : : int r;
957 : : MountParameters *p;
958 : :
959 [ # # ]: 0 : assert(m);
960 : :
961 [ # # ]: 0 : r = unit_fail_if_noncanonical(UNIT(m), m->where);
962 [ # # ]: 0 : if (r < 0)
963 : 0 : goto fail;
964 : :
965 : 0 : (void) mkdir_p_label(m->where, m->directory_mode);
966 : :
967 [ # # ]: 0 : unit_warn_if_dir_nonempty(UNIT(m), m->where);
968 [ # # ]: 0 : unit_warn_leftover_processes(UNIT(m));
969 : :
970 : 0 : m->control_command_id = MOUNT_EXEC_MOUNT;
971 : 0 : m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
972 : :
973 : : /* Create the source directory for bind-mounts if needed */
974 : 0 : p = get_mount_parameters_fragment(m);
975 [ # # # # ]: 0 : if (p && mount_is_bind(p))
976 : 0 : (void) mkdir_p_label(p->what, m->directory_mode);
977 : :
978 [ # # ]: 0 : if (p) {
979 [ # # ]: 0 : _cleanup_free_ char *opts = NULL;
980 : :
981 : 0 : r = fstab_filter_options(p->options, "nofail\0" "noauto\0" "auto\0", NULL, NULL, &opts);
982 [ # # ]: 0 : if (r < 0)
983 : 0 : goto fail;
984 : :
985 : 0 : r = exec_command_set(m->control_command, MOUNT_PATH, p->what, m->where, NULL);
986 [ # # # # ]: 0 : if (r >= 0 && m->sloppy_options)
987 : 0 : r = exec_command_append(m->control_command, "-s", NULL);
988 [ # # # # ]: 0 : if (r >= 0 && p->fstype)
989 : 0 : r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
990 [ # # # # ]: 0 : if (r >= 0 && !isempty(opts))
991 : 0 : r = exec_command_append(m->control_command, "-o", opts, NULL);
992 : : } else
993 : 0 : r = -ENOENT;
994 [ # # ]: 0 : if (r < 0)
995 : 0 : goto fail;
996 : :
997 : 0 : mount_unwatch_control_pid(m);
998 : :
999 : 0 : r = mount_spawn(m, m->control_command, &m->control_pid);
1000 [ # # ]: 0 : if (r < 0)
1001 : 0 : goto fail;
1002 : :
1003 : 0 : mount_set_state(m, MOUNT_MOUNTING);
1004 : :
1005 : 0 : return;
1006 : :
1007 : 0 : fail:
1008 [ # # # # ]: 0 : log_unit_warning_errno(UNIT(m), r, "Failed to run 'mount' task: %m");
1009 : 0 : mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
1010 : : }
1011 : :
1012 : 0 : static void mount_set_reload_result(Mount *m, MountResult result) {
1013 [ # # ]: 0 : assert(m);
1014 : :
1015 : : /* Only store the first error we encounter */
1016 [ # # ]: 0 : if (m->reload_result != MOUNT_SUCCESS)
1017 : 0 : return;
1018 : :
1019 : 0 : m->reload_result = result;
1020 : : }
1021 : :
1022 : 0 : static void mount_enter_remounting(Mount *m) {
1023 : : int r;
1024 : : MountParameters *p;
1025 : :
1026 [ # # ]: 0 : assert(m);
1027 : :
1028 : : /* Reset reload result when we are about to start a new remount operation */
1029 : 0 : m->reload_result = MOUNT_SUCCESS;
1030 : :
1031 : 0 : m->control_command_id = MOUNT_EXEC_REMOUNT;
1032 : 0 : m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
1033 : :
1034 : 0 : p = get_mount_parameters_fragment(m);
1035 [ # # ]: 0 : if (p) {
1036 : : const char *o;
1037 : :
1038 [ # # ]: 0 : if (p->options)
1039 [ # # # # : 0 : o = strjoina("remount,", p->options);
# # # # #
# # # ]
1040 : : else
1041 : 0 : o = "remount";
1042 : :
1043 : 0 : r = exec_command_set(m->control_command, MOUNT_PATH,
1044 : : p->what, m->where,
1045 : : "-o", o, NULL);
1046 [ # # # # ]: 0 : if (r >= 0 && m->sloppy_options)
1047 : 0 : r = exec_command_append(m->control_command, "-s", NULL);
1048 [ # # # # ]: 0 : if (r >= 0 && p->fstype)
1049 : 0 : r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
1050 : : } else
1051 : 0 : r = -ENOENT;
1052 [ # # ]: 0 : if (r < 0)
1053 : 0 : goto fail;
1054 : :
1055 : 0 : mount_unwatch_control_pid(m);
1056 : :
1057 : 0 : r = mount_spawn(m, m->control_command, &m->control_pid);
1058 [ # # ]: 0 : if (r < 0)
1059 : 0 : goto fail;
1060 : :
1061 : 0 : mount_set_state(m, MOUNT_REMOUNTING);
1062 : :
1063 : 0 : return;
1064 : :
1065 : 0 : fail:
1066 [ # # # # ]: 0 : log_unit_warning_errno(UNIT(m), r, "Failed to run 'remount' task: %m");
1067 : 0 : mount_set_reload_result(m, MOUNT_FAILURE_RESOURCES);
1068 : 0 : mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1069 : : }
1070 : :
1071 : 0 : static void mount_cycle_clear(Mount *m) {
1072 [ # # ]: 0 : assert(m);
1073 : :
1074 : : /* Clear all state we shall forget for this new cycle */
1075 : :
1076 : 0 : m->result = MOUNT_SUCCESS;
1077 : 0 : m->reload_result = MOUNT_SUCCESS;
1078 : 0 : exec_command_reset_status_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
1079 [ # # ]: 0 : UNIT(m)->reset_accounting = true;
1080 : 0 : }
1081 : :
1082 : 0 : static int mount_start(Unit *u) {
1083 : 0 : Mount *m = MOUNT(u);
1084 : : int r;
1085 : :
1086 [ # # ]: 0 : assert(m);
1087 : :
1088 : : /* We cannot fulfill this request right now, try again later
1089 : : * please! */
1090 [ # # # # ]: 0 : if (IN_SET(m->state,
1091 : : MOUNT_UNMOUNTING,
1092 : : MOUNT_UNMOUNTING_SIGTERM,
1093 : : MOUNT_UNMOUNTING_SIGKILL))
1094 : 0 : return -EAGAIN;
1095 : :
1096 : : /* Already on it! */
1097 [ # # ]: 0 : if (m->state == MOUNT_MOUNTING)
1098 : 0 : return 0;
1099 : :
1100 [ # # # # ]: 0 : assert(IN_SET(m->state, MOUNT_DEAD, MOUNT_FAILED));
1101 : :
1102 : 0 : r = unit_test_start_limit(u);
1103 [ # # ]: 0 : if (r < 0) {
1104 : 0 : mount_enter_dead(m, MOUNT_FAILURE_START_LIMIT_HIT);
1105 : 0 : return r;
1106 : : }
1107 : :
1108 : 0 : r = unit_acquire_invocation_id(u);
1109 [ # # ]: 0 : if (r < 0)
1110 : 0 : return r;
1111 : :
1112 : 0 : mount_cycle_clear(m);
1113 : 0 : mount_enter_mounting(m);
1114 : :
1115 : 0 : return 1;
1116 : : }
1117 : :
1118 : 0 : static int mount_stop(Unit *u) {
1119 : 0 : Mount *m = MOUNT(u);
1120 : :
1121 [ # # ]: 0 : assert(m);
1122 : :
1123 [ # # # # : 0 : switch (m->state) {
# # ]
1124 : :
1125 : 0 : case MOUNT_UNMOUNTING:
1126 : : case MOUNT_UNMOUNTING_SIGKILL:
1127 : : case MOUNT_UNMOUNTING_SIGTERM:
1128 : : /* Already on it */
1129 : 0 : return 0;
1130 : :
1131 : 0 : case MOUNT_MOUNTING:
1132 : : case MOUNT_MOUNTING_DONE:
1133 : : case MOUNT_REMOUNTING:
1134 : : /* If we are still waiting for /bin/mount, we go directly into kill mode. */
1135 : 0 : mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_SUCCESS);
1136 : 0 : return 0;
1137 : :
1138 : 0 : case MOUNT_REMOUNTING_SIGTERM:
1139 : : /* If we are already waiting for a hung remount, convert this to the matching unmounting state */
1140 : 0 : mount_set_state(m, MOUNT_UNMOUNTING_SIGTERM);
1141 : 0 : return 0;
1142 : :
1143 : 0 : case MOUNT_REMOUNTING_SIGKILL:
1144 : : /* as above */
1145 : 0 : mount_set_state(m, MOUNT_UNMOUNTING_SIGKILL);
1146 : 0 : return 0;
1147 : :
1148 : 0 : case MOUNT_MOUNTED:
1149 : 0 : mount_enter_unmounting(m);
1150 : 0 : return 1;
1151 : :
1152 : 0 : default:
1153 : 0 : assert_not_reached("Unexpected state.");
1154 : : }
1155 : : }
1156 : :
1157 : 0 : static int mount_reload(Unit *u) {
1158 : 0 : Mount *m = MOUNT(u);
1159 : :
1160 [ # # ]: 0 : assert(m);
1161 [ # # ]: 0 : assert(m->state == MOUNT_MOUNTED);
1162 : :
1163 : 0 : mount_enter_remounting(m);
1164 : :
1165 : 0 : return 1;
1166 : : }
1167 : :
1168 : 0 : static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
1169 : 0 : Mount *m = MOUNT(u);
1170 : :
1171 [ # # ]: 0 : assert(m);
1172 [ # # ]: 0 : assert(f);
1173 [ # # ]: 0 : assert(fds);
1174 : :
1175 : 0 : (void) serialize_item(f, "state", mount_state_to_string(m->state));
1176 : 0 : (void) serialize_item(f, "result", mount_result_to_string(m->result));
1177 : 0 : (void) serialize_item(f, "reload-result", mount_result_to_string(m->reload_result));
1178 : 0 : (void) serialize_item_format(f, "n-retry-umount", "%u", m->n_retry_umount);
1179 : :
1180 [ # # ]: 0 : if (m->control_pid > 0)
1181 : 0 : (void) serialize_item_format(f, "control-pid", PID_FMT, m->control_pid);
1182 : :
1183 [ # # ]: 0 : if (m->control_command_id >= 0)
1184 : 0 : (void) serialize_item(f, "control-command", mount_exec_command_to_string(m->control_command_id));
1185 : :
1186 : 0 : return 0;
1187 : : }
1188 : :
1189 : 0 : static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1190 : 0 : Mount *m = MOUNT(u);
1191 : : int r;
1192 : :
1193 [ # # ]: 0 : assert(u);
1194 [ # # ]: 0 : assert(key);
1195 [ # # ]: 0 : assert(value);
1196 [ # # ]: 0 : assert(fds);
1197 : :
1198 [ # # ]: 0 : if (streq(key, "state")) {
1199 : : MountState state;
1200 : :
1201 [ # # ]: 0 : if ((state = mount_state_from_string(value)) < 0)
1202 [ # # ]: 0 : log_unit_debug(u, "Failed to parse state value: %s", value);
1203 : : else
1204 : 0 : m->deserialized_state = state;
1205 : :
1206 [ # # ]: 0 : } else if (streq(key, "result")) {
1207 : : MountResult f;
1208 : :
1209 : 0 : f = mount_result_from_string(value);
1210 [ # # ]: 0 : if (f < 0)
1211 [ # # ]: 0 : log_unit_debug(u, "Failed to parse result value: %s", value);
1212 [ # # ]: 0 : else if (f != MOUNT_SUCCESS)
1213 : 0 : m->result = f;
1214 : :
1215 [ # # ]: 0 : } else if (streq(key, "reload-result")) {
1216 : : MountResult f;
1217 : :
1218 : 0 : f = mount_result_from_string(value);
1219 [ # # ]: 0 : if (f < 0)
1220 [ # # ]: 0 : log_unit_debug(u, "Failed to parse reload result value: %s", value);
1221 [ # # ]: 0 : else if (f != MOUNT_SUCCESS)
1222 : 0 : m->reload_result = f;
1223 : :
1224 [ # # ]: 0 : } else if (streq(key, "n-retry-umount")) {
1225 : :
1226 : 0 : r = safe_atou(value, &m->n_retry_umount);
1227 [ # # ]: 0 : if (r < 0)
1228 [ # # ]: 0 : log_unit_debug(u, "Failed to parse n-retry-umount value: %s", value);
1229 : :
1230 [ # # ]: 0 : } else if (streq(key, "control-pid")) {
1231 : :
1232 [ # # ]: 0 : if (parse_pid(value, &m->control_pid) < 0)
1233 [ # # ]: 0 : log_unit_debug(u, "Failed to parse control-pid value: %s", value);
1234 : :
1235 [ # # ]: 0 : } else if (streq(key, "control-command")) {
1236 : : MountExecCommand id;
1237 : :
1238 : 0 : id = mount_exec_command_from_string(value);
1239 [ # # ]: 0 : if (id < 0)
1240 [ # # ]: 0 : log_unit_debug(u, "Failed to parse exec-command value: %s", value);
1241 : : else {
1242 : 0 : m->control_command_id = id;
1243 : 0 : m->control_command = m->exec_command + id;
1244 : : }
1245 : : } else
1246 [ # # ]: 0 : log_unit_debug(u, "Unknown serialization key: %s", key);
1247 : :
1248 : 0 : return 0;
1249 : : }
1250 : :
1251 : 10262 : _pure_ static UnitActiveState mount_active_state(Unit *u) {
1252 [ - + ]: 10262 : assert(u);
1253 : :
1254 : 10262 : return state_translation_table[MOUNT(u)->state];
1255 : : }
1256 : :
1257 : 0 : _pure_ static const char *mount_sub_state_to_string(Unit *u) {
1258 [ # # ]: 0 : assert(u);
1259 : :
1260 : 0 : return mount_state_to_string(MOUNT(u)->state);
1261 : : }
1262 : :
1263 : 2344 : _pure_ static bool mount_may_gc(Unit *u) {
1264 : 2344 : Mount *m = MOUNT(u);
1265 : :
1266 [ - + ]: 2344 : assert(m);
1267 : :
1268 [ + + ]: 2344 : if (m->from_proc_self_mountinfo)
1269 : 616 : return false;
1270 : :
1271 : 1728 : return true;
1272 : : }
1273 : :
1274 : 0 : static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1275 : 0 : Mount *m = MOUNT(u);
1276 : : MountResult f;
1277 : :
1278 [ # # ]: 0 : assert(m);
1279 [ # # ]: 0 : assert(pid >= 0);
1280 : :
1281 [ # # ]: 0 : if (pid != m->control_pid)
1282 : 0 : return;
1283 : :
1284 : : /* So here's the thing, we really want to know before /usr/bin/mount or /usr/bin/umount exit whether
1285 : : * they established/remove a mount. This is important when mounting, but even more so when unmounting
1286 : : * since we need to deal with nested mounts and otherwise cannot safely determine whether to repeat
1287 : : * the unmounts. In theory, the kernel fires /proc/self/mountinfo changes off before returning from
1288 : : * the mount() or umount() syscalls, and thus we should see the changes to the proc file before we
1289 : : * process the waitid() for the /usr/bin/(u)mount processes. However, this is unfortunately racy: we
1290 : : * have to waitid() for processes using P_ALL (since we need to reap unexpected children that got
1291 : : * reparented to PID 1), but when using P_ALL we might end up reaping processes that terminated just
1292 : : * instants ago, i.e. already after our last event loop iteration (i.e. after the last point we might
1293 : : * have noticed /proc/self/mountinfo events via epoll). This means event loop priorities for
1294 : : * processing SIGCHLD vs. /proc/self/mountinfo IO events are not as relevant as we want. To fix that
1295 : : * race, let's explicitly scan /proc/self/mountinfo before we start processing /usr/bin/(u)mount
1296 : : * dying. It's ugly, but it makes our ordering systematic again, and makes sure we always see
1297 : : * /proc/self/mountinfo changes before our mount/umount exits. */
1298 : 0 : (void) mount_process_proc_self_mountinfo(u->manager);
1299 : :
1300 : 0 : m->control_pid = 0;
1301 : :
1302 [ # # ]: 0 : if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
1303 : 0 : f = MOUNT_SUCCESS;
1304 [ # # ]: 0 : else if (code == CLD_EXITED)
1305 : 0 : f = MOUNT_FAILURE_EXIT_CODE;
1306 [ # # ]: 0 : else if (code == CLD_KILLED)
1307 : 0 : f = MOUNT_FAILURE_SIGNAL;
1308 [ # # ]: 0 : else if (code == CLD_DUMPED)
1309 : 0 : f = MOUNT_FAILURE_CORE_DUMP;
1310 : : else
1311 : 0 : assert_not_reached("Unknown code");
1312 : :
1313 [ # # # # ]: 0 : if (IN_SET(m->state, MOUNT_REMOUNTING, MOUNT_REMOUNTING_SIGKILL, MOUNT_REMOUNTING_SIGTERM))
1314 : 0 : mount_set_reload_result(m, f);
1315 [ # # ]: 0 : else if (m->result == MOUNT_SUCCESS)
1316 : 0 : m->result = f;
1317 : :
1318 [ # # ]: 0 : if (m->control_command) {
1319 : 0 : exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status);
1320 : :
1321 : 0 : m->control_command = NULL;
1322 : 0 : m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1323 : : }
1324 : :
1325 : 0 : unit_log_process_exit(
1326 : : u,
1327 : : "Mount process",
1328 : : mount_exec_command_to_string(m->control_command_id),
1329 : : f == MOUNT_SUCCESS,
1330 : : code, status);
1331 : :
1332 : : /* Note that due to the io event priority logic, we can be sure the new mountinfo is loaded
1333 : : * before we process the SIGCHLD for the mount command. */
1334 : :
1335 [ # # # # : 0 : switch (m->state) {
# # ]
1336 : :
1337 : 0 : case MOUNT_MOUNTING:
1338 : : /* Our mount point has not appeared in mountinfo. Something went wrong. */
1339 : :
1340 [ # # ]: 0 : if (f == MOUNT_SUCCESS) {
1341 : : /* Either /bin/mount has an unexpected definition of success,
1342 : : * or someone raced us and we lost. */
1343 [ # # # # ]: 0 : log_unit_warning(UNIT(m), "Mount process finished, but there is no mount.");
1344 : 0 : f = MOUNT_FAILURE_PROTOCOL;
1345 : : }
1346 : 0 : mount_enter_dead(m, f);
1347 : 0 : break;
1348 : :
1349 : 0 : case MOUNT_MOUNTING_DONE:
1350 : 0 : mount_enter_mounted(m, f);
1351 : 0 : break;
1352 : :
1353 : 0 : case MOUNT_REMOUNTING:
1354 : : case MOUNT_REMOUNTING_SIGTERM:
1355 : : case MOUNT_REMOUNTING_SIGKILL:
1356 : 0 : mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1357 : 0 : break;
1358 : :
1359 : 0 : case MOUNT_UNMOUNTING:
1360 : :
1361 [ # # # # ]: 0 : if (f == MOUNT_SUCCESS && m->from_proc_self_mountinfo) {
1362 : :
1363 : : /* Still a mount point? If so, let's try again. Most likely there were multiple mount points
1364 : : * stacked on top of each other. We might exceed the timeout specified by the user overall,
1365 : : * but we will stop as soon as any one umount times out. */
1366 : :
1367 [ # # ]: 0 : if (m->n_retry_umount < RETRY_UMOUNT_MAX) {
1368 [ # # ]: 0 : log_unit_debug(u, "Mount still present, trying again.");
1369 : 0 : m->n_retry_umount++;
1370 : 0 : mount_enter_unmounting(m);
1371 : : } else {
1372 [ # # ]: 0 : log_unit_warning(u, "Mount still present after %u attempts to unmount, giving up.", m->n_retry_umount);
1373 : 0 : mount_enter_mounted(m, f);
1374 : : }
1375 : : } else
1376 : 0 : mount_enter_dead_or_mounted(m, f);
1377 : :
1378 : 0 : break;
1379 : :
1380 : 0 : case MOUNT_UNMOUNTING_SIGKILL:
1381 : : case MOUNT_UNMOUNTING_SIGTERM:
1382 : 0 : mount_enter_dead_or_mounted(m, f);
1383 : 0 : break;
1384 : :
1385 : 0 : default:
1386 : 0 : assert_not_reached("Uh, control process died at wrong time.");
1387 : : }
1388 : :
1389 : : /* Notify clients about changed exit status */
1390 : 0 : unit_add_to_dbus_queue(u);
1391 : : }
1392 : :
1393 : 0 : static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
1394 : 0 : Mount *m = MOUNT(userdata);
1395 : :
1396 [ # # ]: 0 : assert(m);
1397 [ # # ]: 0 : assert(m->timer_event_source == source);
1398 : :
1399 [ # # # # : 0 : switch (m->state) {
# # # # ]
1400 : :
1401 : 0 : case MOUNT_MOUNTING:
1402 : : case MOUNT_MOUNTING_DONE:
1403 [ # # # # ]: 0 : log_unit_warning(UNIT(m), "Mounting timed out. Terminating.");
1404 : 0 : mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1405 : 0 : break;
1406 : :
1407 : 0 : case MOUNT_REMOUNTING:
1408 [ # # # # ]: 0 : log_unit_warning(UNIT(m), "Remounting timed out. Terminating remount process.");
1409 : 0 : mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1410 : 0 : mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, MOUNT_SUCCESS);
1411 : 0 : break;
1412 : :
1413 : 0 : case MOUNT_REMOUNTING_SIGTERM:
1414 : 0 : mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1415 : :
1416 [ # # ]: 0 : if (m->kill_context.send_sigkill) {
1417 [ # # # # ]: 0 : log_unit_warning(UNIT(m), "Remounting timed out. Killing.");
1418 : 0 : mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
1419 : : } else {
1420 [ # # # # ]: 0 : log_unit_warning(UNIT(m), "Remounting timed out. Skipping SIGKILL. Ignoring.");
1421 : 0 : mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1422 : : }
1423 : 0 : break;
1424 : :
1425 : 0 : case MOUNT_REMOUNTING_SIGKILL:
1426 : 0 : mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
1427 : :
1428 [ # # # # ]: 0 : log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
1429 : 0 : mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
1430 : 0 : break;
1431 : :
1432 : 0 : case MOUNT_UNMOUNTING:
1433 [ # # # # ]: 0 : log_unit_warning(UNIT(m), "Unmounting timed out. Terminating.");
1434 : 0 : mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1435 : 0 : break;
1436 : :
1437 : 0 : case MOUNT_UNMOUNTING_SIGTERM:
1438 [ # # ]: 0 : if (m->kill_context.send_sigkill) {
1439 [ # # # # ]: 0 : log_unit_warning(UNIT(m), "Mount process timed out. Killing.");
1440 : 0 : mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
1441 : : } else {
1442 [ # # # # ]: 0 : log_unit_warning(UNIT(m), "Mount process timed out. Skipping SIGKILL. Ignoring.");
1443 : 0 : mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
1444 : : }
1445 : 0 : break;
1446 : :
1447 : 0 : case MOUNT_UNMOUNTING_SIGKILL:
1448 [ # # # # ]: 0 : log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
1449 : 0 : mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
1450 : 0 : break;
1451 : :
1452 : 0 : default:
1453 : 0 : assert_not_reached("Timeout at wrong time.");
1454 : : }
1455 : :
1456 : 0 : return 0;
1457 : : }
1458 : :
1459 : 616 : static int mount_setup_new_unit(
1460 : : Manager *m,
1461 : : const char *name,
1462 : : const char *what,
1463 : : const char *where,
1464 : : const char *options,
1465 : : const char *fstype,
1466 : : MountProcFlags *ret_flags,
1467 : : Unit **ret) {
1468 : :
1469 : 616 : _cleanup_(unit_freep) Unit *u = NULL;
1470 : : int r;
1471 : :
1472 [ - + ]: 616 : assert(m);
1473 [ - + ]: 616 : assert(name);
1474 [ - + ]: 616 : assert(ret_flags);
1475 [ - + ]: 616 : assert(ret);
1476 : :
1477 : 616 : r = unit_new_for_name(m, sizeof(Mount), name, &u);
1478 [ - + ]: 616 : if (r < 0)
1479 : 0 : return r;
1480 : :
1481 : 616 : r = free_and_strdup(&u->source_path, "/proc/self/mountinfo");
1482 [ - + ]: 616 : if (r < 0)
1483 : 0 : return r;
1484 : :
1485 : 616 : r = free_and_strdup(&MOUNT(u)->where, where);
1486 [ - + ]: 616 : if (r < 0)
1487 : 0 : return r;
1488 : :
1489 : 616 : r = update_parameters_proc_self_mountinfo(MOUNT(u), what, options, fstype);
1490 [ - + ]: 616 : if (r < 0)
1491 : 0 : return r;
1492 : :
1493 : : /* This unit was generated because /proc/self/mountinfo reported it. Remember this, so that by the time we load
1494 : : * the unit file for it (and thus add in extra deps right after) we know what source to attributes the deps
1495 : : * to.*/
1496 : 616 : MOUNT(u)->from_proc_self_mountinfo = true;
1497 : :
1498 : : /* We have only allocated the stub now, let's enqueue this unit for loading now, so that everything else is
1499 : : * loaded in now. */
1500 : 616 : unit_add_to_load_queue(u);
1501 : :
1502 : 616 : *ret_flags = MOUNT_PROC_IS_MOUNTED | MOUNT_PROC_JUST_MOUNTED | MOUNT_PROC_JUST_CHANGED;
1503 : 616 : *ret = TAKE_PTR(u);
1504 : 616 : return 0;
1505 : : }
1506 : :
1507 : 44 : static int mount_setup_existing_unit(
1508 : : Unit *u,
1509 : : const char *what,
1510 : : const char *where,
1511 : : const char *options,
1512 : : const char *fstype,
1513 : : MountProcFlags *ret_flags) {
1514 : :
1515 : 44 : MountProcFlags flags = MOUNT_PROC_IS_MOUNTED;
1516 : : int r;
1517 : :
1518 [ - + ]: 44 : assert(u);
1519 [ - + ]: 44 : assert(flags);
1520 : :
1521 [ + - ]: 44 : if (!MOUNT(u)->where) {
1522 : 44 : MOUNT(u)->where = strdup(where);
1523 [ - + ]: 44 : if (!MOUNT(u)->where)
1524 : 0 : return -ENOMEM;
1525 : : }
1526 : :
1527 : 44 : r = update_parameters_proc_self_mountinfo(MOUNT(u), what, options, fstype);
1528 [ - + ]: 44 : if (r < 0)
1529 : 0 : return r;
1530 [ + - ]: 44 : if (r > 0)
1531 : 44 : flags |= MOUNT_PROC_JUST_CHANGED;
1532 : :
1533 [ - + # # ]: 44 : if (!MOUNT(u)->from_proc_self_mountinfo || FLAGS_SET(MOUNT(u)->proc_flags, MOUNT_PROC_JUST_MOUNTED))
1534 : 44 : flags |= MOUNT_PROC_JUST_MOUNTED;
1535 : :
1536 : 44 : MOUNT(u)->from_proc_self_mountinfo = true;
1537 : :
1538 [ - + - + ]: 44 : if (IN_SET(u->load_state, UNIT_NOT_FOUND, UNIT_BAD_SETTING, UNIT_ERROR)) {
1539 : : /* The unit was previously not found or otherwise not loaded. Now that the unit shows up in
1540 : : * /proc/self/mountinfo we should reconsider it this, hence set it to UNIT_LOADED. */
1541 : 0 : u->load_state = UNIT_LOADED;
1542 : 0 : u->load_error = 0;
1543 : :
1544 : 0 : flags |= MOUNT_PROC_JUST_CHANGED;
1545 : : }
1546 : :
1547 [ + - ]: 44 : if (FLAGS_SET(flags, MOUNT_PROC_JUST_CHANGED)) {
1548 : : /* If things changed, then make sure that all deps are regenerated. Let's
1549 : : * first remove all automatic deps, and then add in the new ones. */
1550 : :
1551 : 44 : unit_remove_dependencies(u, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
1552 : :
1553 : 44 : r = mount_add_extras(MOUNT(u));
1554 [ - + ]: 44 : if (r < 0)
1555 : 0 : return r;
1556 : : }
1557 : :
1558 : 44 : *ret_flags = flags;
1559 : 44 : return 0;
1560 : : }
1561 : :
1562 : 1716 : static int mount_setup_unit(
1563 : : Manager *m,
1564 : : const char *what,
1565 : : const char *where,
1566 : : const char *options,
1567 : : const char *fstype,
1568 : : bool set_flags) {
1569 : :
1570 : 1716 : _cleanup_free_ char *e = NULL;
1571 : : MountProcFlags flags;
1572 : : Unit *u;
1573 : : int r;
1574 : :
1575 [ - + ]: 1716 : assert(m);
1576 [ - + ]: 1716 : assert(what);
1577 [ - + ]: 1716 : assert(where);
1578 [ - + ]: 1716 : assert(options);
1579 [ - + ]: 1716 : assert(fstype);
1580 : :
1581 : : /* Ignore API mount points. They should never be referenced in
1582 : : * dependencies ever. */
1583 [ + + + + ]: 1716 : if (mount_point_is_api(where) || mount_point_ignore(where))
1584 : 1012 : return 0;
1585 : :
1586 [ + + ]: 704 : if (streq(fstype, "autofs"))
1587 : 44 : return 0;
1588 : :
1589 : : /* probably some kind of swap, ignore */
1590 [ - + ]: 660 : if (!is_path(where))
1591 : 0 : return 0;
1592 : :
1593 : 660 : r = unit_name_from_path(where, ".mount", &e);
1594 [ - + ]: 660 : if (r < 0)
1595 [ # # ]: 0 : return log_error_errno(r, "Failed to generate unit name from path '%s': %m", where);
1596 : :
1597 : 660 : u = manager_get_unit(m, e);
1598 [ + + ]: 660 : if (u)
1599 : 44 : r = mount_setup_existing_unit(u, what, where, options, fstype, &flags);
1600 : : else
1601 : : /* First time we see this mount point meaning that it's not been initiated by a mount unit but rather
1602 : : * by the sysadmin having called mount(8) directly. */
1603 : 616 : r = mount_setup_new_unit(m, e, what, where, options, fstype, &flags, &u);
1604 [ - + ]: 660 : if (r < 0)
1605 [ # # ]: 0 : return log_warning_errno(r, "Failed to set up mount unit: %m");
1606 : :
1607 : : /* If the mount changed properties or state, let's notify our clients */
1608 [ + - ]: 660 : if (flags & (MOUNT_PROC_JUST_CHANGED|MOUNT_PROC_JUST_MOUNTED))
1609 : 660 : unit_add_to_dbus_queue(u);
1610 : :
1611 [ - + ]: 660 : if (set_flags)
1612 : 0 : MOUNT(u)->proc_flags = flags;
1613 : :
1614 : 660 : return 0;
1615 : : }
1616 : :
1617 : 44 : static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1618 : 44 : _cleanup_(mnt_free_tablep) struct libmnt_table *table = NULL;
1619 : 44 : _cleanup_(mnt_free_iterp) struct libmnt_iter *iter = NULL;
1620 : : int r;
1621 : :
1622 [ - + ]: 44 : assert(m);
1623 : :
1624 : 44 : r = libmount_parse(NULL, NULL, &table, &iter);
1625 [ - + ]: 44 : if (r < 0)
1626 [ # # ]: 0 : return log_error_errno(r, "Failed to parse /proc/self/mountinfo: %m");
1627 : :
1628 : 1716 : for (;;) {
1629 : : struct libmnt_fs *fs;
1630 : : const char *device, *path, *options, *fstype;
1631 : :
1632 : 1760 : r = mnt_table_next_fs(table, iter, &fs);
1633 [ + + ]: 1760 : if (r == 1)
1634 : 44 : break;
1635 [ - + ]: 1716 : if (r < 0)
1636 [ # # ]: 0 : return log_error_errno(r, "Failed to get next entry from /proc/self/mountinfo: %m");
1637 : :
1638 : 1716 : device = mnt_fs_get_source(fs);
1639 : 1716 : path = mnt_fs_get_target(fs);
1640 : 1716 : options = mnt_fs_get_options(fs);
1641 : 1716 : fstype = mnt_fs_get_fstype(fs);
1642 : :
1643 [ + - - + ]: 1716 : if (!device || !path)
1644 : 0 : continue;
1645 : :
1646 : 1716 : device_found_node(m, device, DEVICE_FOUND_MOUNT, DEVICE_FOUND_MOUNT);
1647 : :
1648 : 1716 : (void) mount_setup_unit(m, device, path, options, fstype, set_flags);
1649 : : }
1650 : :
1651 : 44 : return 0;
1652 : : }
1653 : :
1654 : 56 : static void mount_shutdown(Manager *m) {
1655 [ - + ]: 56 : assert(m);
1656 : :
1657 : 56 : m->mount_event_source = sd_event_source_unref(m->mount_event_source);
1658 : :
1659 : 56 : mnt_unref_monitor(m->mount_monitor);
1660 : 56 : m->mount_monitor = NULL;
1661 : 56 : }
1662 : :
1663 : 0 : static int mount_get_timeout(Unit *u, usec_t *timeout) {
1664 : 0 : Mount *m = MOUNT(u);
1665 : : usec_t t;
1666 : : int r;
1667 : :
1668 [ # # ]: 0 : if (!m->timer_event_source)
1669 : 0 : return 0;
1670 : :
1671 : 0 : r = sd_event_source_get_time(m->timer_event_source, &t);
1672 [ # # ]: 0 : if (r < 0)
1673 : 0 : return r;
1674 [ # # ]: 0 : if (t == USEC_INFINITY)
1675 : 0 : return 0;
1676 : :
1677 : 0 : *timeout = t;
1678 : 0 : return 1;
1679 : : }
1680 : :
1681 : 44 : static void mount_enumerate_perpetual(Manager *m) {
1682 : : Unit *u;
1683 : : int r;
1684 : :
1685 [ - + ]: 44 : assert(m);
1686 : :
1687 : : /* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's
1688 : : * unconditionally synthesize it here and mark it as perpetual. */
1689 : :
1690 : 44 : u = manager_get_unit(m, SPECIAL_ROOT_MOUNT);
1691 [ + - ]: 44 : if (!u) {
1692 : 44 : r = unit_new_for_name(m, sizeof(Mount), SPECIAL_ROOT_MOUNT, &u);
1693 [ - + ]: 44 : if (r < 0) {
1694 [ # # ]: 0 : log_error_errno(r, "Failed to allocate the special " SPECIAL_ROOT_MOUNT " unit: %m");
1695 : 0 : return;
1696 : : }
1697 : : }
1698 : :
1699 : 44 : u->perpetual = true;
1700 : 44 : MOUNT(u)->deserialized_state = MOUNT_MOUNTED;
1701 : :
1702 : 44 : unit_add_to_load_queue(u);
1703 : 44 : unit_add_to_dbus_queue(u);
1704 : : }
1705 : :
1706 : 0 : static bool mount_is_mounted(Mount *m) {
1707 [ # # ]: 0 : assert(m);
1708 : :
1709 [ # # # # : 0 : return UNIT(m)->perpetual || FLAGS_SET(m->proc_flags, MOUNT_PROC_IS_MOUNTED);
# # ]
1710 : : }
1711 : :
1712 : 44 : static void mount_enumerate(Manager *m) {
1713 : : int r;
1714 : :
1715 [ - + ]: 44 : assert(m);
1716 : :
1717 : 44 : mnt_init_debug(0);
1718 : :
1719 [ + - ]: 44 : if (!m->mount_monitor) {
1720 : : int fd;
1721 : :
1722 : 44 : m->mount_monitor = mnt_new_monitor();
1723 [ - + ]: 44 : if (!m->mount_monitor) {
1724 : 0 : log_oom();
1725 : 0 : goto fail;
1726 : : }
1727 : :
1728 : 44 : r = mnt_monitor_enable_kernel(m->mount_monitor, 1);
1729 [ - + ]: 44 : if (r < 0) {
1730 [ # # ]: 0 : log_error_errno(r, "Failed to enable watching of kernel mount events: %m");
1731 : 0 : goto fail;
1732 : : }
1733 : :
1734 : 44 : r = mnt_monitor_enable_userspace(m->mount_monitor, 1, NULL);
1735 [ - + ]: 44 : if (r < 0) {
1736 [ # # ]: 0 : log_error_errno(r, "Failed to enable watching of userspace mount events: %m");
1737 : 0 : goto fail;
1738 : : }
1739 : :
1740 : : /* mnt_unref_monitor() will close the fd */
1741 : 44 : fd = r = mnt_monitor_get_fd(m->mount_monitor);
1742 [ - + ]: 44 : if (r < 0) {
1743 [ # # ]: 0 : log_error_errno(r, "Failed to acquire watch file descriptor: %m");
1744 : 0 : goto fail;
1745 : : }
1746 : :
1747 : 44 : r = sd_event_add_io(m->event, &m->mount_event_source, fd, EPOLLIN, mount_dispatch_io, m);
1748 [ - + ]: 44 : if (r < 0) {
1749 [ # # ]: 0 : log_error_errno(r, "Failed to watch mount file descriptor: %m");
1750 : 0 : goto fail;
1751 : : }
1752 : :
1753 : 44 : r = sd_event_source_set_priority(m->mount_event_source, SD_EVENT_PRIORITY_NORMAL-10);
1754 [ - + ]: 44 : if (r < 0) {
1755 [ # # ]: 0 : log_error_errno(r, "Failed to adjust mount watch priority: %m");
1756 : 0 : goto fail;
1757 : : }
1758 : :
1759 : 44 : (void) sd_event_source_set_description(m->mount_event_source, "mount-monitor-dispatch");
1760 : : }
1761 : :
1762 : 44 : r = mount_load_proc_self_mountinfo(m, false);
1763 [ - + ]: 44 : if (r < 0)
1764 : 0 : goto fail;
1765 : :
1766 : 44 : return;
1767 : :
1768 : 0 : fail:
1769 : 0 : mount_shutdown(m);
1770 : : }
1771 : :
1772 : 0 : static int drain_libmount(Manager *m) {
1773 : 0 : bool rescan = false;
1774 : : int r;
1775 : :
1776 [ # # ]: 0 : assert(m);
1777 : :
1778 : : /* Drain all events and verify that the event is valid.
1779 : : *
1780 : : * Note that libmount also monitors /run/mount mkdir if the directory does not exist yet. The mkdir
1781 : : * may generate event which is irrelevant for us.
1782 : : *
1783 : : * error: r < 0; valid: r == 0, false positive: r == 1 */
1784 : : do {
1785 : 0 : r = mnt_monitor_next_change(m->mount_monitor, NULL, NULL);
1786 [ # # ]: 0 : if (r < 0)
1787 [ # # ]: 0 : return log_error_errno(r, "Failed to drain libmount events: %m");
1788 [ # # ]: 0 : if (r == 0)
1789 : 0 : rescan = true;
1790 [ # # ]: 0 : } while (r == 0);
1791 : :
1792 : 0 : return rescan;
1793 : : }
1794 : :
1795 : 0 : static int mount_process_proc_self_mountinfo(Manager *m) {
1796 : 0 : _cleanup_set_free_free_ Set *around = NULL, *gone = NULL;
1797 : : const char *what;
1798 : : Iterator i;
1799 : : Unit *u;
1800 : : int r;
1801 : :
1802 [ # # ]: 0 : assert(m);
1803 : :
1804 : 0 : r = drain_libmount(m);
1805 [ # # ]: 0 : if (r <= 0)
1806 : 0 : return r;
1807 : :
1808 : 0 : r = mount_load_proc_self_mountinfo(m, true);
1809 [ # # ]: 0 : if (r < 0) {
1810 : : /* Reset flags, just in case, for later calls */
1811 [ # # ]: 0 : LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT])
1812 : 0 : MOUNT(u)->proc_flags = 0;
1813 : :
1814 : 0 : return 0;
1815 : : }
1816 : :
1817 : 0 : manager_dispatch_load_queue(m);
1818 : :
1819 [ # # ]: 0 : LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1820 : 0 : Mount *mount = MOUNT(u);
1821 : :
1822 [ # # ]: 0 : if (!mount_is_mounted(mount)) {
1823 : :
1824 : : /* A mount point is not around right now. It
1825 : : * might be gone, or might never have
1826 : : * existed. */
1827 : :
1828 [ # # ]: 0 : if (mount->from_proc_self_mountinfo &&
1829 [ # # ]: 0 : mount->parameters_proc_self_mountinfo.what) {
1830 : :
1831 : : /* Remember that this device might just have disappeared */
1832 [ # # # # ]: 0 : if (set_ensure_allocated(&gone, &path_hash_ops) < 0 ||
1833 : 0 : set_put_strdup(gone, mount->parameters_proc_self_mountinfo.what) < 0)
1834 : 0 : log_oom(); /* we don't care too much about OOM here... */
1835 : : }
1836 : :
1837 : 0 : mount->from_proc_self_mountinfo = false;
1838 [ # # ]: 0 : assert_se(update_parameters_proc_self_mountinfo(mount, NULL, NULL, NULL) >= 0);
1839 : :
1840 [ # # ]: 0 : switch (mount->state) {
1841 : :
1842 : 0 : case MOUNT_MOUNTED:
1843 : : /* This has just been unmounted by somebody else, follow the state change. */
1844 : 0 : mount_enter_dead(mount, MOUNT_SUCCESS);
1845 : 0 : break;
1846 : :
1847 : 0 : default:
1848 : 0 : break;
1849 : : }
1850 : :
1851 [ # # ]: 0 : } else if (mount->proc_flags & (MOUNT_PROC_JUST_MOUNTED|MOUNT_PROC_JUST_CHANGED)) {
1852 : :
1853 : : /* A mount point was added or changed */
1854 : :
1855 [ # # # ]: 0 : switch (mount->state) {
1856 : :
1857 : 0 : case MOUNT_DEAD:
1858 : : case MOUNT_FAILED:
1859 : :
1860 : : /* This has just been mounted by somebody else, follow the state change, but let's
1861 : : * generate a new invocation ID for this implicitly and automatically. */
1862 : 0 : (void) unit_acquire_invocation_id(u);
1863 : 0 : mount_cycle_clear(mount);
1864 : 0 : mount_enter_mounted(mount, MOUNT_SUCCESS);
1865 : 0 : break;
1866 : :
1867 : 0 : case MOUNT_MOUNTING:
1868 : 0 : mount_set_state(mount, MOUNT_MOUNTING_DONE);
1869 : 0 : break;
1870 : :
1871 : 0 : default:
1872 : : /* Nothing really changed, but let's
1873 : : * issue an notification call
1874 : : * nonetheless, in case somebody is
1875 : : * waiting for this. (e.g. file system
1876 : : * ro/rw remounts.) */
1877 : 0 : mount_set_state(mount, mount->state);
1878 : 0 : break;
1879 : : }
1880 : 0 : }
1881 : :
1882 [ # # # # ]: 0 : if (mount_is_mounted(mount) &&
1883 : 0 : mount->from_proc_self_mountinfo &&
1884 [ # # ]: 0 : mount->parameters_proc_self_mountinfo.what) {
1885 : : /* Track devices currently used */
1886 : :
1887 [ # # # # ]: 0 : if (set_ensure_allocated(&around, &path_hash_ops) < 0 ||
1888 : 0 : set_put_strdup(around, mount->parameters_proc_self_mountinfo.what) < 0)
1889 : 0 : log_oom();
1890 : : }
1891 : :
1892 : : /* Reset the flags for later calls */
1893 : 0 : mount->proc_flags = 0;
1894 : : }
1895 : :
1896 [ # # ]: 0 : SET_FOREACH(what, gone, i) {
1897 [ # # ]: 0 : if (set_contains(around, what))
1898 : 0 : continue;
1899 : :
1900 : : /* Let the device units know that the device is no longer mounted */
1901 : 0 : device_found_node(m, what, 0, DEVICE_FOUND_MOUNT);
1902 : : }
1903 : :
1904 : 0 : return 0;
1905 : : }
1906 : :
1907 : 0 : static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
1908 : 0 : Manager *m = userdata;
1909 : :
1910 [ # # ]: 0 : assert(m);
1911 [ # # ]: 0 : assert(revents & EPOLLIN);
1912 : :
1913 : 0 : return mount_process_proc_self_mountinfo(m);
1914 : : }
1915 : :
1916 : 0 : static void mount_reset_failed(Unit *u) {
1917 : 0 : Mount *m = MOUNT(u);
1918 : :
1919 [ # # ]: 0 : assert(m);
1920 : :
1921 [ # # ]: 0 : if (m->state == MOUNT_FAILED)
1922 : 0 : mount_set_state(m, MOUNT_DEAD);
1923 : :
1924 : 0 : m->result = MOUNT_SUCCESS;
1925 : 0 : m->reload_result = MOUNT_SUCCESS;
1926 : 0 : }
1927 : :
1928 : 0 : static int mount_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
1929 : 0 : Mount *m = MOUNT(u);
1930 : :
1931 [ # # ]: 0 : assert(m);
1932 : :
1933 : 0 : return unit_kill_common(u, who, signo, -1, m->control_pid, error);
1934 : : }
1935 : :
1936 : 0 : static int mount_control_pid(Unit *u) {
1937 : 0 : Mount *m = MOUNT(u);
1938 : :
1939 [ # # ]: 0 : assert(m);
1940 : :
1941 : 0 : return m->control_pid;
1942 : : }
1943 : :
1944 : : static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1945 : : [MOUNT_EXEC_MOUNT] = "ExecMount",
1946 : : [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1947 : : [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1948 : : };
1949 : :
1950 [ + + + + ]: 40 : DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1951 : :
1952 : : static const char* const mount_result_table[_MOUNT_RESULT_MAX] = {
1953 : : [MOUNT_SUCCESS] = "success",
1954 : : [MOUNT_FAILURE_RESOURCES] = "resources",
1955 : : [MOUNT_FAILURE_TIMEOUT] = "timeout",
1956 : : [MOUNT_FAILURE_EXIT_CODE] = "exit-code",
1957 : : [MOUNT_FAILURE_SIGNAL] = "signal",
1958 : : [MOUNT_FAILURE_CORE_DUMP] = "core-dump",
1959 : : [MOUNT_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
1960 : : [MOUNT_FAILURE_PROTOCOL] = "protocol",
1961 : : };
1962 : :
1963 [ + + + + ]: 440 : DEFINE_STRING_TABLE_LOOKUP(mount_result, MountResult);
1964 : :
1965 : : const UnitVTable mount_vtable = {
1966 : : .object_size = sizeof(Mount),
1967 : : .exec_context_offset = offsetof(Mount, exec_context),
1968 : : .cgroup_context_offset = offsetof(Mount, cgroup_context),
1969 : : .kill_context_offset = offsetof(Mount, kill_context),
1970 : : .exec_runtime_offset = offsetof(Mount, exec_runtime),
1971 : : .dynamic_creds_offset = offsetof(Mount, dynamic_creds),
1972 : :
1973 : : .sections =
1974 : : "Unit\0"
1975 : : "Mount\0"
1976 : : "Install\0",
1977 : : .private_section = "Mount",
1978 : :
1979 : : .init = mount_init,
1980 : : .load = mount_load,
1981 : : .done = mount_done,
1982 : :
1983 : : .coldplug = mount_coldplug,
1984 : :
1985 : : .dump = mount_dump,
1986 : :
1987 : : .start = mount_start,
1988 : : .stop = mount_stop,
1989 : : .reload = mount_reload,
1990 : :
1991 : : .kill = mount_kill,
1992 : :
1993 : : .serialize = mount_serialize,
1994 : : .deserialize_item = mount_deserialize_item,
1995 : :
1996 : : .active_state = mount_active_state,
1997 : : .sub_state_to_string = mount_sub_state_to_string,
1998 : :
1999 : : .may_gc = mount_may_gc,
2000 : :
2001 : : .sigchld_event = mount_sigchld_event,
2002 : :
2003 : : .reset_failed = mount_reset_failed,
2004 : :
2005 : : .control_pid = mount_control_pid,
2006 : :
2007 : : .bus_vtable = bus_mount_vtable,
2008 : : .bus_set_property = bus_mount_set_property,
2009 : : .bus_commit_properties = bus_mount_commit_properties,
2010 : :
2011 : : .get_timeout = mount_get_timeout,
2012 : :
2013 : : .can_transient = true,
2014 : :
2015 : : .enumerate_perpetual = mount_enumerate_perpetual,
2016 : : .enumerate = mount_enumerate,
2017 : : .shutdown = mount_shutdown,
2018 : :
2019 : : .status_message_formats = {
2020 : : .starting_stopping = {
2021 : : [0] = "Mounting %s...",
2022 : : [1] = "Unmounting %s...",
2023 : : },
2024 : : .finished_start_job = {
2025 : : [JOB_DONE] = "Mounted %s.",
2026 : : [JOB_FAILED] = "Failed to mount %s.",
2027 : : [JOB_TIMEOUT] = "Timed out mounting %s.",
2028 : : },
2029 : : .finished_stop_job = {
2030 : : [JOB_DONE] = "Unmounted %s.",
2031 : : [JOB_FAILED] = "Failed unmounting %s.",
2032 : : [JOB_TIMEOUT] = "Timed out unmounting %s.",
2033 : : },
2034 : : },
2035 : : };
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