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d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
5cb5a6ff | 2 | |
a7334b09 LP |
3 | /*** |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
5cb5a6ff | 22 | #include <errno.h> |
8d567588 LP |
23 | #include <limits.h> |
24 | #include <sys/mount.h> | |
25 | #include <unistd.h> | |
26 | #include <fcntl.h> | |
27 | #include <sys/epoll.h> | |
28 | #include <sys/stat.h> | |
29 | #include <linux/auto_fs4.h> | |
30 | #include <linux/auto_dev-ioctl.h> | |
5cb5a6ff | 31 | |
87f0e418 | 32 | #include "unit.h" |
5cb5a6ff LP |
33 | #include "automount.h" |
34 | #include "load-fragment.h" | |
5cb5a6ff | 35 | #include "load-dropin.h" |
8d567588 | 36 | #include "unit-name.h" |
4139c1b2 | 37 | #include "dbus-automount.h" |
398ef8ba | 38 | #include "bus-errors.h" |
4e67ddd6 | 39 | #include "special.h" |
e51bc1a2 | 40 | #include "label.h" |
49e942b2 | 41 | #include "mkdir.h" |
5cb5a6ff | 42 | |
e537352b LP |
43 | static const UnitActiveState state_translation_table[_AUTOMOUNT_STATE_MAX] = { |
44 | [AUTOMOUNT_DEAD] = UNIT_INACTIVE, | |
45 | [AUTOMOUNT_WAITING] = UNIT_ACTIVE, | |
46 | [AUTOMOUNT_RUNNING] = UNIT_ACTIVE, | |
74ac3cbd | 47 | [AUTOMOUNT_FAILED] = UNIT_FAILED |
e537352b | 48 | }; |
5cb5a6ff | 49 | |
a16e1123 | 50 | static int open_dev_autofs(Manager *m); |
8d567588 | 51 | |
e537352b LP |
52 | static void automount_init(Unit *u) { |
53 | Automount *a = AUTOMOUNT(u); | |
5cb5a6ff | 54 | |
8d567588 | 55 | assert(u); |
ac155bb8 | 56 | assert(u->load_state == UNIT_STUB); |
8d567588 LP |
57 | |
58 | a->pipe_watch.fd = a->pipe_fd = -1; | |
a16e1123 | 59 | a->pipe_watch.type = WATCH_INVALID; |
1cf18f27 LP |
60 | |
61 | a->directory_mode = 0755; | |
c8f4d764 | 62 | |
1124fe6f | 63 | UNIT(a)->ignore_on_isolate = true; |
8d567588 LP |
64 | } |
65 | ||
66 | static void repeat_unmout(const char *path) { | |
67 | assert(path); | |
68 | ||
69 | for (;;) { | |
1b560190 LP |
70 | /* If there are multiple mounts on a mount point, this |
71 | * removes them all */ | |
8d567588 LP |
72 | |
73 | if (umount2(path, MNT_DETACH) >= 0) | |
74 | continue; | |
75 | ||
76 | if (errno != EINVAL) | |
77 | log_error("Failed to unmount: %m"); | |
78 | ||
79 | break; | |
80 | } | |
81 | } | |
82 | ||
83 | static void unmount_autofs(Automount *a) { | |
84 | assert(a); | |
85 | ||
86 | if (a->pipe_fd < 0) | |
87 | return; | |
88 | ||
89 | automount_send_ready(a, -EHOSTDOWN); | |
90 | ||
91 | unit_unwatch_fd(UNIT(a), &a->pipe_watch); | |
92 | close_nointr_nofail(a->pipe_fd); | |
93 | a->pipe_fd = -1; | |
94 | ||
a16e1123 LP |
95 | /* If we reload/reexecute things we keep the mount point |
96 | * around */ | |
97 | if (a->where && | |
1124fe6f MS |
98 | (UNIT(a)->manager->exit_code != MANAGER_RELOAD && |
99 | UNIT(a)->manager->exit_code != MANAGER_REEXECUTE)) | |
a16e1123 | 100 | repeat_unmout(a->where); |
8d567588 LP |
101 | } |
102 | ||
103 | static void automount_done(Unit *u) { | |
104 | Automount *a = AUTOMOUNT(u); | |
105 | ||
106 | assert(a); | |
107 | ||
108 | unmount_autofs(a); | |
57020a3a | 109 | unit_ref_unset(&a->mount); |
8d567588 | 110 | |
a16e1123 LP |
111 | free(a->where); |
112 | a->where = NULL; | |
113 | ||
114 | set_free(a->tokens); | |
115 | a->tokens = NULL; | |
8d567588 LP |
116 | } |
117 | ||
6e2ef85b LP |
118 | int automount_add_one_mount_link(Automount *a, Mount *m) { |
119 | int r; | |
120 | ||
121 | assert(a); | |
122 | assert(m); | |
123 | ||
1124fe6f MS |
124 | if (UNIT(a)->load_state != UNIT_LOADED || |
125 | UNIT(m)->load_state != UNIT_LOADED) | |
6e2ef85b LP |
126 | return 0; |
127 | ||
128 | if (!path_startswith(a->where, m->where)) | |
129 | return 0; | |
130 | ||
1b560190 LP |
131 | if (path_equal(a->where, m->where)) |
132 | return 0; | |
133 | ||
2c966c03 | 134 | if ((r = unit_add_two_dependencies(UNIT(a), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0) |
6e2ef85b LP |
135 | return r; |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
140 | static int automount_add_mount_links(Automount *a) { | |
ac155bb8 | 141 | Unit *other; |
6e2ef85b LP |
142 | int r; |
143 | ||
144 | assert(a); | |
145 | ||
1124fe6f | 146 | LIST_FOREACH(units_by_type, other, UNIT(a)->manager->units_by_type[UNIT_MOUNT]) |
595ed347 | 147 | if ((r = automount_add_one_mount_link(a, MOUNT(other))) < 0) |
6e2ef85b LP |
148 | return r; |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
2edd4434 LP |
153 | static int automount_add_default_dependencies(Automount *a) { |
154 | int r; | |
155 | ||
156 | assert(a); | |
157 | ||
1124fe6f | 158 | if (UNIT(a)->manager->running_as == MANAGER_SYSTEM) { |
2edd4434 | 159 | |
2a77d31d LP |
160 | if ((r = unit_add_dependency_by_name(UNIT(a), UNIT_BEFORE, SPECIAL_BASIC_TARGET, NULL, true)) < 0) |
161 | return r; | |
162 | ||
ead8e478 | 163 | if ((r = unit_add_two_dependencies_by_name(UNIT(a), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0) |
2edd4434 LP |
164 | return r; |
165 | } | |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
8d567588 LP |
170 | static int automount_verify(Automount *a) { |
171 | bool b; | |
172 | char *e; | |
173 | assert(a); | |
174 | ||
1124fe6f | 175 | if (UNIT(a)->load_state != UNIT_LOADED) |
8d567588 LP |
176 | return 0; |
177 | ||
41e45059 LP |
178 | if (path_equal(a->where, "/")) { |
179 | log_error("Cannot have an automount unit for the root directory. Refusing."); | |
180 | return -EINVAL; | |
181 | } | |
182 | ||
a16e1123 | 183 | if (!(e = unit_name_from_path(a->where, ".automount"))) |
8d567588 LP |
184 | return -ENOMEM; |
185 | ||
186 | b = unit_has_name(UNIT(a), e); | |
187 | free(e); | |
188 | ||
189 | if (!b) { | |
1124fe6f | 190 | log_error("%s's Where setting doesn't match unit name. Refusing.", UNIT(a)->id); |
8d567588 LP |
191 | return -EINVAL; |
192 | } | |
193 | ||
194 | return 0; | |
e537352b | 195 | } |
5cb5a6ff | 196 | |
e537352b LP |
197 | static int automount_load(Unit *u) { |
198 | int r; | |
199 | Automount *a = AUTOMOUNT(u); | |
23a177ef | 200 | |
e537352b | 201 | assert(u); |
ac155bb8 | 202 | assert(u->load_state == UNIT_STUB); |
5cb5a6ff | 203 | |
e537352b LP |
204 | /* Load a .automount file */ |
205 | if ((r = unit_load_fragment_and_dropin_optional(u)) < 0) | |
206 | return r; | |
23a177ef | 207 | |
ac155bb8 | 208 | if (u->load_state == UNIT_LOADED) { |
57020a3a | 209 | Unit *x; |
23a177ef | 210 | |
a16e1123 | 211 | if (!a->where) |
ac155bb8 | 212 | if (!(a->where = unit_name_to_path(u->id))) |
a16e1123 LP |
213 | return -ENOMEM; |
214 | ||
215 | path_kill_slashes(a->where); | |
216 | ||
6e2ef85b LP |
217 | if ((r = automount_add_mount_links(a)) < 0) |
218 | return r; | |
219 | ||
57020a3a LP |
220 | r = unit_load_related_unit(u, ".mount", &x); |
221 | if (r < 0) | |
23a177ef LP |
222 | return r; |
223 | ||
57020a3a LP |
224 | unit_ref_set(&a->mount, x); |
225 | ||
226 | r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(a->mount), true); | |
227 | if (r < 0) | |
23a177ef | 228 | return r; |
4e67ddd6 | 229 | |
1124fe6f | 230 | if (UNIT(a)->default_dependencies) |
2edd4434 | 231 | if ((r = automount_add_default_dependencies(a)) < 0) |
4e67ddd6 | 232 | return r; |
23a177ef LP |
233 | } |
234 | ||
8d567588 | 235 | return automount_verify(a); |
5cb5a6ff LP |
236 | } |
237 | ||
8d567588 LP |
238 | static void automount_set_state(Automount *a, AutomountState state) { |
239 | AutomountState old_state; | |
e537352b | 240 | assert(a); |
034c6ed7 | 241 | |
8d567588 LP |
242 | old_state = a->state; |
243 | a->state = state; | |
244 | ||
245 | if (state != AUTOMOUNT_WAITING && | |
246 | state != AUTOMOUNT_RUNNING) | |
247 | unmount_autofs(a); | |
248 | ||
249 | if (state != old_state) | |
40d50879 | 250 | log_debug("%s changed %s -> %s", |
1124fe6f | 251 | UNIT(a)->id, |
a16e1123 LP |
252 | automount_state_to_string(old_state), |
253 | automount_state_to_string(state)); | |
8d567588 | 254 | |
e2f3b44c | 255 | unit_notify(UNIT(a), state_translation_table[old_state], state_translation_table[state], true); |
034c6ed7 LP |
256 | } |
257 | ||
a16e1123 LP |
258 | static int automount_coldplug(Unit *u) { |
259 | Automount *a = AUTOMOUNT(u); | |
260 | int r; | |
261 | ||
262 | assert(a); | |
263 | assert(a->state == AUTOMOUNT_DEAD); | |
264 | ||
265 | if (a->deserialized_state != a->state) { | |
266 | ||
ac155bb8 | 267 | if ((r = open_dev_autofs(u->manager)) < 0) |
a16e1123 LP |
268 | return r; |
269 | ||
270 | if (a->deserialized_state == AUTOMOUNT_WAITING || | |
271 | a->deserialized_state == AUTOMOUNT_RUNNING) { | |
272 | ||
273 | assert(a->pipe_fd >= 0); | |
274 | ||
275 | if ((r = unit_watch_fd(UNIT(a), a->pipe_fd, EPOLLIN, &a->pipe_watch)) < 0) | |
276 | return r; | |
277 | } | |
278 | ||
279 | automount_set_state(a, a->deserialized_state); | |
280 | } | |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
87f0e418 | 285 | static void automount_dump(Unit *u, FILE *f, const char *prefix) { |
a16e1123 | 286 | Automount *a = AUTOMOUNT(u); |
5cb5a6ff | 287 | |
a16e1123 | 288 | assert(a); |
5cb5a6ff LP |
289 | |
290 | fprintf(f, | |
a16e1123 | 291 | "%sAutomount State: %s\n" |
81a5c6d0 | 292 | "%sResult: %s\n" |
1cf18f27 LP |
293 | "%sWhere: %s\n" |
294 | "%sDirectoryMode: %04o\n", | |
a16e1123 | 295 | prefix, automount_state_to_string(a->state), |
81a5c6d0 | 296 | prefix, automount_result_to_string(a->result), |
1cf18f27 LP |
297 | prefix, a->where, |
298 | prefix, a->directory_mode); | |
5cb5a6ff LP |
299 | } |
300 | ||
81a5c6d0 | 301 | static void automount_enter_dead(Automount *a, AutomountResult f) { |
8d567588 LP |
302 | assert(a); |
303 | ||
81a5c6d0 LP |
304 | if (f != AUTOMOUNT_SUCCESS) |
305 | a->result = f; | |
8d567588 | 306 | |
81a5c6d0 | 307 | automount_set_state(a, a->result != AUTOMOUNT_SUCCESS ? AUTOMOUNT_FAILED : AUTOMOUNT_DEAD); |
8d567588 LP |
308 | } |
309 | ||
310 | static int open_dev_autofs(Manager *m) { | |
311 | struct autofs_dev_ioctl param; | |
312 | ||
313 | assert(m); | |
314 | ||
315 | if (m->dev_autofs_fd >= 0) | |
316 | return m->dev_autofs_fd; | |
317 | ||
c0f9c7da | 318 | label_fix("/dev/autofs", false); |
56cf987f | 319 | |
a16e1123 | 320 | if ((m->dev_autofs_fd = open("/dev/autofs", O_CLOEXEC|O_RDONLY)) < 0) { |
11c3a4ee LP |
321 | log_error("Failed to open /dev/autofs: %s", strerror(errno)); |
322 | return -errno; | |
8d567588 LP |
323 | } |
324 | ||
325 | init_autofs_dev_ioctl(¶m); | |
326 | if (ioctl(m->dev_autofs_fd, AUTOFS_DEV_IOCTL_VERSION, ¶m) < 0) { | |
327 | close_nointr_nofail(m->dev_autofs_fd); | |
328 | m->dev_autofs_fd = -1; | |
329 | return -errno; | |
330 | } | |
331 | ||
332 | log_debug("Autofs kernel version %i.%i", param.ver_major, param.ver_minor); | |
333 | ||
334 | return m->dev_autofs_fd; | |
335 | } | |
336 | ||
337 | static int open_ioctl_fd(int dev_autofs_fd, const char *where, dev_t devid) { | |
338 | struct autofs_dev_ioctl *param; | |
339 | size_t l; | |
340 | int r; | |
341 | ||
342 | assert(dev_autofs_fd >= 0); | |
343 | assert(where); | |
344 | ||
345 | l = sizeof(struct autofs_dev_ioctl) + strlen(where) + 1; | |
346 | ||
347 | if (!(param = malloc(l))) | |
348 | return -ENOMEM; | |
349 | ||
350 | init_autofs_dev_ioctl(param); | |
351 | param->size = l; | |
352 | param->ioctlfd = -1; | |
353 | param->openmount.devid = devid; | |
354 | strcpy(param->path, where); | |
355 | ||
356 | if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_OPENMOUNT, param) < 0) { | |
357 | r = -errno; | |
358 | goto finish; | |
359 | } | |
360 | ||
361 | if (param->ioctlfd < 0) { | |
362 | r = -EIO; | |
363 | goto finish; | |
364 | } | |
365 | ||
a16e1123 | 366 | fd_cloexec(param->ioctlfd, true); |
8d567588 LP |
367 | r = param->ioctlfd; |
368 | ||
369 | finish: | |
370 | free(param); | |
371 | return r; | |
372 | } | |
373 | ||
374 | static int autofs_protocol(int dev_autofs_fd, int ioctl_fd) { | |
375 | uint32_t major, minor; | |
376 | struct autofs_dev_ioctl param; | |
377 | ||
378 | assert(dev_autofs_fd >= 0); | |
379 | assert(ioctl_fd >= 0); | |
380 | ||
381 | init_autofs_dev_ioctl(¶m); | |
382 | param.ioctlfd = ioctl_fd; | |
383 | ||
384 | if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_PROTOVER, ¶m) < 0) | |
385 | return -errno; | |
386 | ||
387 | major = param.protover.version; | |
388 | ||
389 | init_autofs_dev_ioctl(¶m); | |
390 | param.ioctlfd = ioctl_fd; | |
391 | ||
392 | if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_PROTOSUBVER, ¶m) < 0) | |
393 | return -errno; | |
394 | ||
395 | minor = param.protosubver.sub_version; | |
396 | ||
397 | log_debug("Autofs protocol version %i.%i", major, minor); | |
398 | return 0; | |
399 | } | |
400 | ||
401 | static int autofs_set_timeout(int dev_autofs_fd, int ioctl_fd, time_t sec) { | |
402 | struct autofs_dev_ioctl param; | |
403 | ||
404 | assert(dev_autofs_fd >= 0); | |
405 | assert(ioctl_fd >= 0); | |
406 | ||
407 | init_autofs_dev_ioctl(¶m); | |
408 | param.ioctlfd = ioctl_fd; | |
409 | param.timeout.timeout = sec; | |
410 | ||
411 | if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_TIMEOUT, ¶m) < 0) | |
412 | return -errno; | |
413 | ||
414 | return 0; | |
415 | } | |
416 | ||
417 | static int autofs_send_ready(int dev_autofs_fd, int ioctl_fd, uint32_t token, int status) { | |
418 | struct autofs_dev_ioctl param; | |
419 | ||
420 | assert(dev_autofs_fd >= 0); | |
421 | assert(ioctl_fd >= 0); | |
422 | ||
423 | init_autofs_dev_ioctl(¶m); | |
424 | param.ioctlfd = ioctl_fd; | |
425 | ||
426 | if (status) { | |
427 | param.fail.token = token; | |
428 | param.fail.status = status; | |
429 | } else | |
430 | param.ready.token = token; | |
431 | ||
432 | if (ioctl(dev_autofs_fd, status ? AUTOFS_DEV_IOCTL_FAIL : AUTOFS_DEV_IOCTL_READY, ¶m) < 0) | |
433 | return -errno; | |
434 | ||
435 | return 0; | |
436 | } | |
437 | ||
438 | int automount_send_ready(Automount *a, int status) { | |
439 | int ioctl_fd, r; | |
440 | unsigned token; | |
441 | ||
442 | assert(a); | |
443 | assert(status <= 0); | |
444 | ||
445 | if (set_isempty(a->tokens)) | |
446 | return 0; | |
447 | ||
1124fe6f | 448 | if ((ioctl_fd = open_ioctl_fd(UNIT(a)->manager->dev_autofs_fd, a->where, a->dev_id)) < 0) { |
8d567588 LP |
449 | r = ioctl_fd; |
450 | goto fail; | |
451 | } | |
452 | ||
453 | if (status) | |
454 | log_debug("Sending failure: %s", strerror(-status)); | |
455 | else | |
456 | log_debug("Sending success."); | |
457 | ||
e364ad06 LP |
458 | r = 0; |
459 | ||
8d567588 LP |
460 | /* Autofs thankfully does not hand out 0 as a token */ |
461 | while ((token = PTR_TO_UINT(set_steal_first(a->tokens)))) { | |
462 | int k; | |
463 | ||
464 | /* Autofs fun fact II: | |
465 | * | |
466 | * if you pass a positive status code here, the kernel will | |
467 | * freeze! Yay! */ | |
468 | ||
1124fe6f | 469 | if ((k = autofs_send_ready(UNIT(a)->manager->dev_autofs_fd, |
8d567588 LP |
470 | ioctl_fd, |
471 | token, | |
472 | status)) < 0) | |
473 | r = k; | |
474 | } | |
475 | ||
8d567588 LP |
476 | fail: |
477 | if (ioctl_fd >= 0) | |
478 | close_nointr_nofail(ioctl_fd); | |
479 | ||
480 | return r; | |
481 | } | |
482 | ||
483 | static void automount_enter_waiting(Automount *a) { | |
484 | int p[2] = { -1, -1 }; | |
485 | char name[32], options[128]; | |
486 | bool mounted = false; | |
487 | int r, ioctl_fd = -1, dev_autofs_fd; | |
488 | struct stat st; | |
489 | ||
490 | assert(a); | |
491 | assert(a->pipe_fd < 0); | |
492 | assert(a->where); | |
493 | ||
494 | if (a->tokens) | |
495 | set_clear(a->tokens); | |
8d567588 | 496 | |
1124fe6f | 497 | if ((dev_autofs_fd = open_dev_autofs(UNIT(a)->manager)) < 0) { |
8d567588 LP |
498 | r = dev_autofs_fd; |
499 | goto fail; | |
500 | } | |
501 | ||
502 | /* We knowingly ignore the results of this call */ | |
503 | mkdir_p(a->where, 0555); | |
504 | ||
a16e1123 | 505 | if (pipe2(p, O_NONBLOCK|O_CLOEXEC) < 0) { |
8d567588 LP |
506 | r = -errno; |
507 | goto fail; | |
508 | } | |
509 | ||
510 | snprintf(options, sizeof(options), "fd=%i,pgrp=%u,minproto=5,maxproto=5,direct", p[1], (unsigned) getpgrp()); | |
511 | char_array_0(options); | |
512 | ||
513 | snprintf(name, sizeof(name), "systemd-%u", (unsigned) getpid()); | |
514 | char_array_0(name); | |
515 | ||
516 | if (mount(name, a->where, "autofs", 0, options) < 0) { | |
517 | r = -errno; | |
518 | goto fail; | |
519 | } | |
520 | ||
521 | mounted = true; | |
522 | ||
523 | close_nointr_nofail(p[1]); | |
524 | p[1] = -1; | |
525 | ||
526 | if (stat(a->where, &st) < 0) { | |
527 | r = -errno; | |
528 | goto fail; | |
529 | } | |
530 | ||
531 | if ((ioctl_fd = open_ioctl_fd(dev_autofs_fd, a->where, st.st_dev)) < 0) { | |
532 | r = ioctl_fd; | |
533 | goto fail; | |
534 | } | |
535 | ||
536 | if ((r = autofs_protocol(dev_autofs_fd, ioctl_fd)) < 0) | |
537 | goto fail; | |
538 | ||
539 | if ((r = autofs_set_timeout(dev_autofs_fd, ioctl_fd, 300)) < 0) | |
540 | goto fail; | |
541 | ||
542 | /* Autofs fun fact: | |
543 | * | |
544 | * Unless we close the ioctl fd here, for some weird reason | |
545 | * the direct mount will not receive events from the | |
546 | * kernel. */ | |
547 | ||
548 | close_nointr_nofail(ioctl_fd); | |
549 | ioctl_fd = -1; | |
550 | ||
551 | if ((r = unit_watch_fd(UNIT(a), p[0], EPOLLIN, &a->pipe_watch)) < 0) | |
552 | goto fail; | |
553 | ||
554 | a->pipe_fd = p[0]; | |
555 | a->dev_id = st.st_dev; | |
556 | ||
557 | automount_set_state(a, AUTOMOUNT_WAITING); | |
558 | ||
559 | return; | |
560 | ||
561 | fail: | |
562 | assert_se(close_pipe(p) == 0); | |
563 | ||
564 | if (ioctl_fd >= 0) | |
565 | close_nointr_nofail(ioctl_fd); | |
566 | ||
567 | if (mounted) | |
568 | repeat_unmout(a->where); | |
569 | ||
570 | log_error("Failed to initialize automounter: %s", strerror(-r)); | |
81a5c6d0 | 571 | automount_enter_dead(a, AUTOMOUNT_FAILURE_RESOURCES); |
8d567588 LP |
572 | } |
573 | ||
574 | static void automount_enter_runnning(Automount *a) { | |
575 | int r; | |
576 | struct stat st; | |
398ef8ba | 577 | DBusError error; |
8d567588 LP |
578 | |
579 | assert(a); | |
57020a3a | 580 | assert(UNIT_DEREF(a->mount)); |
8d567588 | 581 | |
398ef8ba LP |
582 | dbus_error_init(&error); |
583 | ||
ba3e67a7 LP |
584 | /* We don't take mount requests anymore if we are supposed to |
585 | * shut down anyway */ | |
5d909e3e | 586 | if (unit_pending_inactive(UNIT(a))) { |
1124fe6f | 587 | log_debug("Suppressing automount request on %s since unit stop is scheduled.", UNIT(a)->id); |
ba3e67a7 LP |
588 | automount_send_ready(a, -EHOSTDOWN); |
589 | return; | |
590 | } | |
591 | ||
1cf18f27 | 592 | mkdir_p(a->where, a->directory_mode); |
8d567588 | 593 | |
1cf18f27 LP |
594 | /* Before we do anything, let's see if somebody is playing games with us? */ |
595 | if (lstat(a->where, &st) < 0) { | |
1124fe6f | 596 | log_warning("%s failed to stat automount point: %m", UNIT(a)->id); |
8d567588 LP |
597 | goto fail; |
598 | } | |
599 | ||
600 | if (!S_ISDIR(st.st_mode) || st.st_dev != a->dev_id) | |
1124fe6f MS |
601 | log_info("%s's automount point already active?", UNIT(a)->id); |
602 | else if ((r = manager_add_job(UNIT(a)->manager, JOB_START, UNIT_DEREF(a->mount), JOB_REPLACE, true, &error, NULL)) < 0) { | |
603 | log_warning("%s failed to queue mount startup job: %s", UNIT(a)->id, bus_error(&error, r)); | |
8d567588 LP |
604 | goto fail; |
605 | } | |
606 | ||
607 | automount_set_state(a, AUTOMOUNT_RUNNING); | |
608 | return; | |
609 | ||
610 | fail: | |
81a5c6d0 | 611 | automount_enter_dead(a, AUTOMOUNT_FAILURE_RESOURCES); |
398ef8ba | 612 | dbus_error_free(&error); |
8d567588 LP |
613 | } |
614 | ||
615 | static int automount_start(Unit *u) { | |
616 | Automount *a = AUTOMOUNT(u); | |
617 | ||
618 | assert(a); | |
619 | ||
74ac3cbd | 620 | assert(a->state == AUTOMOUNT_DEAD || a->state == AUTOMOUNT_FAILED); |
01f78473 | 621 | |
0c85a4f3 | 622 | if (path_is_mount_point(a->where, false)) { |
ac155bb8 | 623 | log_error("Path %s is already a mount point, refusing start for %s", a->where, u->id); |
8d567588 LP |
624 | return -EEXIST; |
625 | } | |
626 | ||
ac155bb8 | 627 | if (UNIT_DEREF(a->mount)->load_state != UNIT_LOADED) |
01f78473 | 628 | return -ENOENT; |
8d567588 | 629 | |
81a5c6d0 | 630 | a->result = AUTOMOUNT_SUCCESS; |
8d567588 LP |
631 | automount_enter_waiting(a); |
632 | return 0; | |
633 | } | |
634 | ||
635 | static int automount_stop(Unit *u) { | |
636 | Automount *a = AUTOMOUNT(u); | |
637 | ||
638 | assert(a); | |
639 | ||
640 | assert(a->state == AUTOMOUNT_WAITING || a->state == AUTOMOUNT_RUNNING); | |
641 | ||
81a5c6d0 | 642 | automount_enter_dead(a, AUTOMOUNT_SUCCESS); |
8d567588 LP |
643 | return 0; |
644 | } | |
645 | ||
a16e1123 LP |
646 | static int automount_serialize(Unit *u, FILE *f, FDSet *fds) { |
647 | Automount *a = AUTOMOUNT(u); | |
648 | void *p; | |
649 | Iterator i; | |
650 | ||
651 | assert(a); | |
652 | assert(f); | |
653 | assert(fds); | |
654 | ||
655 | unit_serialize_item(u, f, "state", automount_state_to_string(a->state)); | |
81a5c6d0 | 656 | unit_serialize_item(u, f, "result", automount_result_to_string(a->result)); |
a16e1123 LP |
657 | unit_serialize_item_format(u, f, "dev-id", "%u", (unsigned) a->dev_id); |
658 | ||
659 | SET_FOREACH(p, a->tokens, i) | |
660 | unit_serialize_item_format(u, f, "token", "%u", PTR_TO_UINT(p)); | |
661 | ||
662 | if (a->pipe_fd >= 0) { | |
663 | int copy; | |
664 | ||
665 | if ((copy = fdset_put_dup(fds, a->pipe_fd)) < 0) | |
666 | return copy; | |
667 | ||
668 | unit_serialize_item_format(u, f, "pipe-fd", "%i", copy); | |
669 | } | |
670 | ||
671 | return 0; | |
672 | } | |
673 | ||
674 | static int automount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
675 | Automount *a = AUTOMOUNT(u); | |
676 | int r; | |
677 | ||
678 | assert(a); | |
679 | assert(fds); | |
680 | ||
681 | if (streq(key, "state")) { | |
682 | AutomountState state; | |
683 | ||
684 | if ((state = automount_state_from_string(value)) < 0) | |
685 | log_debug("Failed to parse state value %s", value); | |
686 | else | |
687 | a->deserialized_state = state; | |
81a5c6d0 LP |
688 | } else if (streq(key, "result")) { |
689 | AutomountResult f; | |
690 | ||
691 | f = automount_result_from_string(value); | |
692 | if (f < 0) | |
693 | log_debug("Failed to parse result value %s", value); | |
694 | else if (f != AUTOMOUNT_SUCCESS) | |
695 | a->result = f; | |
a16e1123 | 696 | |
a16e1123 LP |
697 | } else if (streq(key, "dev-id")) { |
698 | unsigned d; | |
699 | ||
700 | if (safe_atou(value, &d) < 0) | |
701 | log_debug("Failed to parse dev-id value %s", value); | |
702 | else | |
703 | a->dev_id = (unsigned) d; | |
704 | } else if (streq(key, "token")) { | |
705 | unsigned token; | |
706 | ||
707 | if (safe_atou(value, &token) < 0) | |
708 | log_debug("Failed to parse token value %s", value); | |
709 | else { | |
710 | if (!a->tokens) | |
711 | if (!(a->tokens = set_new(trivial_hash_func, trivial_compare_func))) | |
712 | return -ENOMEM; | |
713 | ||
714 | if ((r = set_put(a->tokens, UINT_TO_PTR(token))) < 0) | |
715 | return r; | |
716 | } | |
717 | } else if (streq(key, "pipe-fd")) { | |
718 | int fd; | |
719 | ||
720 | if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) | |
721 | log_debug("Failed to parse pipe-fd value %s", value); | |
722 | else { | |
723 | if (a->pipe_fd >= 0) | |
724 | close_nointr_nofail(a->pipe_fd); | |
725 | ||
726 | a->pipe_fd = fdset_remove(fds, fd); | |
727 | } | |
728 | } else | |
729 | log_debug("Unknown serialization key '%s'", key); | |
730 | ||
731 | return 0; | |
732 | } | |
733 | ||
87f0e418 | 734 | static UnitActiveState automount_active_state(Unit *u) { |
a16e1123 | 735 | assert(u); |
87f0e418 | 736 | |
e537352b | 737 | return state_translation_table[AUTOMOUNT(u)->state]; |
5cb5a6ff LP |
738 | } |
739 | ||
10a94420 LP |
740 | static const char *automount_sub_state_to_string(Unit *u) { |
741 | assert(u); | |
742 | ||
a16e1123 | 743 | return automount_state_to_string(AUTOMOUNT(u)->state); |
10a94420 LP |
744 | } |
745 | ||
701cc384 LP |
746 | static bool automount_check_gc(Unit *u) { |
747 | Automount *a = AUTOMOUNT(u); | |
748 | ||
749 | assert(a); | |
750 | ||
57020a3a | 751 | if (!UNIT_DEREF(a->mount)) |
7573916f LP |
752 | return false; |
753 | ||
57020a3a | 754 | return UNIT_VTABLE(UNIT_DEREF(a->mount))->check_gc(UNIT_DEREF(a->mount)); |
701cc384 LP |
755 | } |
756 | ||
8d567588 | 757 | static void automount_fd_event(Unit *u, int fd, uint32_t events, Watch *w) { |
701cc384 | 758 | Automount *a = AUTOMOUNT(u); |
8d567588 LP |
759 | union autofs_v5_packet_union packet; |
760 | ssize_t l; | |
761 | int r; | |
762 | ||
8d567588 LP |
763 | assert(a); |
764 | assert(fd == a->pipe_fd); | |
765 | ||
766 | if (events != EPOLLIN) { | |
767 | log_error("Got invalid poll event on pipe."); | |
768 | goto fail; | |
769 | } | |
770 | ||
eb22ac37 | 771 | if ((l = loop_read(a->pipe_fd, &packet, sizeof(packet), true)) != sizeof(packet)) { |
8d567588 LP |
772 | log_error("Invalid read from pipe: %s", l < 0 ? strerror(-l) : "short read"); |
773 | goto fail; | |
774 | } | |
775 | ||
776 | switch (packet.hdr.type) { | |
777 | ||
778 | case autofs_ptype_missing_direct: | |
941a4041 LP |
779 | |
780 | if (packet.v5_packet.pid > 0) { | |
781 | char *p = NULL; | |
782 | ||
87d2c1ff | 783 | get_process_comm(packet.v5_packet.pid, &p); |
941a4041 LP |
784 | log_debug("Got direct mount request for %s, triggered by %lu (%s)", packet.v5_packet.name, (unsigned long) packet.v5_packet.pid, strna(p)); |
785 | free(p); | |
786 | ||
787 | } else | |
788 | log_debug("Got direct mount request for %s", packet.v5_packet.name); | |
8d567588 | 789 | |
a16e1123 LP |
790 | if (!a->tokens) |
791 | if (!(a->tokens = set_new(trivial_hash_func, trivial_compare_func))) { | |
792 | log_error("Failed to allocate token set."); | |
793 | goto fail; | |
794 | } | |
795 | ||
8d567588 LP |
796 | if ((r = set_put(a->tokens, UINT_TO_PTR(packet.v5_packet.wait_queue_token))) < 0) { |
797 | log_error("Failed to remember token: %s", strerror(-r)); | |
798 | goto fail; | |
799 | } | |
800 | ||
801 | automount_enter_runnning(a); | |
802 | break; | |
803 | ||
804 | default: | |
805 | log_error("Received unknown automount request %i", packet.hdr.type); | |
806 | break; | |
807 | } | |
808 | ||
809 | return; | |
810 | ||
811 | fail: | |
81a5c6d0 | 812 | automount_enter_dead(a, AUTOMOUNT_FAILURE_RESOURCES); |
8d567588 LP |
813 | } |
814 | ||
815 | static void automount_shutdown(Manager *m) { | |
816 | assert(m); | |
817 | ||
818 | if (m->dev_autofs_fd >= 0) | |
819 | close_nointr_nofail(m->dev_autofs_fd); | |
820 | } | |
821 | ||
74ac3cbd | 822 | static void automount_reset_failed(Unit *u) { |
5632e374 LP |
823 | Automount *a = AUTOMOUNT(u); |
824 | ||
825 | assert(a); | |
826 | ||
74ac3cbd | 827 | if (a->state == AUTOMOUNT_FAILED) |
5632e374 LP |
828 | automount_set_state(a, AUTOMOUNT_DEAD); |
829 | ||
81a5c6d0 | 830 | a->result = AUTOMOUNT_SUCCESS; |
5632e374 LP |
831 | } |
832 | ||
a16e1123 LP |
833 | static const char* const automount_state_table[_AUTOMOUNT_STATE_MAX] = { |
834 | [AUTOMOUNT_DEAD] = "dead", | |
835 | [AUTOMOUNT_WAITING] = "waiting", | |
836 | [AUTOMOUNT_RUNNING] = "running", | |
74ac3cbd | 837 | [AUTOMOUNT_FAILED] = "failed" |
a16e1123 LP |
838 | }; |
839 | ||
840 | DEFINE_STRING_TABLE_LOOKUP(automount_state, AutomountState); | |
841 | ||
81a5c6d0 LP |
842 | static const char* const automount_result_table[_AUTOMOUNT_RESULT_MAX] = { |
843 | [AUTOMOUNT_SUCCESS] = "success", | |
844 | [AUTOMOUNT_FAILURE_RESOURCES] = "resources" | |
845 | }; | |
846 | ||
847 | DEFINE_STRING_TABLE_LOOKUP(automount_result, AutomountResult); | |
848 | ||
87f0e418 | 849 | const UnitVTable automount_vtable = { |
8d567588 | 850 | .suffix = ".automount", |
7d17cfbc | 851 | .object_size = sizeof(Automount), |
f975e971 LP |
852 | .sections = |
853 | "Unit\0" | |
854 | "Automount\0" | |
855 | "Install\0", | |
5cb5a6ff | 856 | |
e537352b | 857 | .no_alias = true, |
8d567588 | 858 | .no_instances = true, |
e537352b | 859 | |
034c6ed7 | 860 | .init = automount_init, |
e537352b | 861 | .load = automount_load, |
034c6ed7 | 862 | .done = automount_done, |
5cb5a6ff | 863 | |
a16e1123 LP |
864 | .coldplug = automount_coldplug, |
865 | ||
034c6ed7 | 866 | .dump = automount_dump, |
5cb5a6ff | 867 | |
8d567588 LP |
868 | .start = automount_start, |
869 | .stop = automount_stop, | |
870 | ||
a16e1123 LP |
871 | .serialize = automount_serialize, |
872 | .deserialize_item = automount_deserialize_item, | |
873 | ||
10a94420 | 874 | .active_state = automount_active_state, |
8d567588 LP |
875 | .sub_state_to_string = automount_sub_state_to_string, |
876 | ||
701cc384 LP |
877 | .check_gc = automount_check_gc, |
878 | ||
8d567588 LP |
879 | .fd_event = automount_fd_event, |
880 | ||
74ac3cbd | 881 | .reset_failed = automount_reset_failed, |
5632e374 | 882 | |
c4e2ceae | 883 | .bus_interface = "org.freedesktop.systemd1.Automount", |
4139c1b2 | 884 | .bus_message_handler = bus_automount_message_handler, |
067d72c9 | 885 | .bus_invalidating_properties = bus_automount_invalidating_properties, |
4139c1b2 | 886 | |
8d567588 | 887 | .shutdown = automount_shutdown |
5cb5a6ff | 888 | }; |