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Commit | Line | Data |
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5cb5a6ff LP |
1 | /*-*- Mode: C; c-basic-offset: 8 -*-*/ |
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" |
5cb5a6ff | 37 | |
e537352b LP |
38 | static const UnitActiveState state_translation_table[_AUTOMOUNT_STATE_MAX] = { |
39 | [AUTOMOUNT_DEAD] = UNIT_INACTIVE, | |
40 | [AUTOMOUNT_WAITING] = UNIT_ACTIVE, | |
41 | [AUTOMOUNT_RUNNING] = UNIT_ACTIVE, | |
42 | [AUTOMOUNT_MAINTAINANCE] = UNIT_INACTIVE, | |
43 | }; | |
5cb5a6ff | 44 | |
e537352b LP |
45 | static const char* const state_string_table[_AUTOMOUNT_STATE_MAX] = { |
46 | [AUTOMOUNT_DEAD] = "dead", | |
47 | [AUTOMOUNT_WAITING] = "waiting", | |
48 | [AUTOMOUNT_RUNNING] = "running", | |
49 | [AUTOMOUNT_MAINTAINANCE] = "maintainance" | |
50 | }; | |
5cb5a6ff | 51 | |
8d567588 LP |
52 | static char *automount_name_from_where(const char *where) { |
53 | assert(where); | |
54 | ||
55 | if (streq(where, "/")) | |
56 | return strdup("-.automount"); | |
57 | ||
58 | return unit_name_build_escape(where+1, NULL, ".automount"); | |
59 | } | |
60 | ||
e537352b LP |
61 | static void automount_init(Unit *u) { |
62 | Automount *a = AUTOMOUNT(u); | |
5cb5a6ff | 63 | |
8d567588 LP |
64 | assert(u); |
65 | assert(u->meta.load_state == UNIT_STUB); | |
66 | ||
67 | a->pipe_watch.fd = a->pipe_fd = -1; | |
68 | } | |
69 | ||
70 | static void repeat_unmout(const char *path) { | |
71 | assert(path); | |
72 | ||
73 | for (;;) { | |
74 | ||
75 | if (umount2(path, MNT_DETACH) >= 0) | |
76 | continue; | |
77 | ||
78 | if (errno != EINVAL) | |
79 | log_error("Failed to unmount: %m"); | |
80 | ||
81 | break; | |
82 | } | |
83 | } | |
84 | ||
85 | static void unmount_autofs(Automount *a) { | |
86 | assert(a); | |
87 | ||
88 | if (a->pipe_fd < 0) | |
89 | return; | |
90 | ||
91 | automount_send_ready(a, -EHOSTDOWN); | |
92 | ||
93 | unit_unwatch_fd(UNIT(a), &a->pipe_watch); | |
94 | close_nointr_nofail(a->pipe_fd); | |
95 | a->pipe_fd = -1; | |
96 | ||
97 | repeat_unmout(a->where); | |
98 | } | |
99 | ||
100 | static void automount_done(Unit *u) { | |
101 | Automount *a = AUTOMOUNT(u); | |
102 | ||
103 | assert(a); | |
104 | ||
105 | unmount_autofs(a); | |
e537352b | 106 | a->mount = NULL; |
8d567588 LP |
107 | |
108 | if (a->tokens) { | |
109 | set_free(a->tokens); | |
110 | a->tokens = NULL; | |
111 | } | |
112 | } | |
113 | ||
114 | static int automount_verify(Automount *a) { | |
115 | bool b; | |
116 | char *e; | |
117 | assert(a); | |
118 | ||
119 | if (UNIT(a)->meta.load_state != UNIT_LOADED) | |
120 | return 0; | |
121 | ||
122 | if (!a->where) { | |
123 | log_error("%s lacks Where setting. Refusing.", UNIT(a)->meta.id); | |
124 | return -EINVAL; | |
125 | } | |
126 | ||
127 | path_kill_slashes(a->where); | |
128 | ||
129 | if (!(e = automount_name_from_where(a->where))) | |
130 | return -ENOMEM; | |
131 | ||
132 | b = unit_has_name(UNIT(a), e); | |
133 | free(e); | |
134 | ||
135 | if (!b) { | |
136 | log_error("%s's Where setting doesn't match unit name. Refusing.", UNIT(a)->meta.id); | |
137 | return -EINVAL; | |
138 | } | |
139 | ||
140 | return 0; | |
e537352b | 141 | } |
5cb5a6ff | 142 | |
e537352b LP |
143 | static int automount_load(Unit *u) { |
144 | int r; | |
145 | Automount *a = AUTOMOUNT(u); | |
23a177ef | 146 | |
e537352b LP |
147 | assert(u); |
148 | assert(u->meta.load_state == UNIT_STUB); | |
5cb5a6ff | 149 | |
e537352b LP |
150 | /* Load a .automount file */ |
151 | if ((r = unit_load_fragment_and_dropin_optional(u)) < 0) | |
152 | return r; | |
23a177ef | 153 | |
e537352b | 154 | if (u->meta.load_state == UNIT_LOADED) { |
23a177ef | 155 | |
e537352b | 156 | if ((r = unit_load_related_unit(u, ".mount", (Unit**) &a->mount)) < 0) |
23a177ef LP |
157 | return r; |
158 | ||
e537352b | 159 | if ((r = unit_add_dependency(u, UNIT_BEFORE, UNIT(a->mount))) < 0) |
23a177ef LP |
160 | return r; |
161 | } | |
162 | ||
8d567588 | 163 | return automount_verify(a); |
5cb5a6ff LP |
164 | } |
165 | ||
8d567588 LP |
166 | static void automount_set_state(Automount *a, AutomountState state) { |
167 | AutomountState old_state; | |
e537352b | 168 | assert(a); |
034c6ed7 | 169 | |
8d567588 LP |
170 | old_state = a->state; |
171 | a->state = state; | |
172 | ||
173 | if (state != AUTOMOUNT_WAITING && | |
174 | state != AUTOMOUNT_RUNNING) | |
175 | unmount_autofs(a); | |
176 | ||
177 | if (state != old_state) | |
178 | log_debug("%s changed %s → %s", UNIT(a)->meta.id, state_string_table[old_state], state_string_table[state]); | |
179 | ||
180 | unit_notify(UNIT(a), state_translation_table[old_state], state_translation_table[state]); | |
034c6ed7 LP |
181 | } |
182 | ||
87f0e418 | 183 | static void automount_dump(Unit *u, FILE *f, const char *prefix) { |
87f0e418 | 184 | Automount *s = AUTOMOUNT(u); |
5cb5a6ff LP |
185 | |
186 | assert(s); | |
187 | ||
188 | fprintf(f, | |
e537352b LP |
189 | "%sAutomount State: %s\n", |
190 | prefix, state_string_table[s->state]); | |
5cb5a6ff LP |
191 | } |
192 | ||
8d567588 LP |
193 | static void automount_enter_dead(Automount *a, bool success) { |
194 | assert(a); | |
195 | ||
196 | if (!success) | |
197 | a->failure = true; | |
198 | ||
199 | automount_set_state(a, a->failure ? AUTOMOUNT_MAINTAINANCE : AUTOMOUNT_DEAD); | |
200 | } | |
201 | ||
202 | static int open_dev_autofs(Manager *m) { | |
203 | struct autofs_dev_ioctl param; | |
204 | ||
205 | assert(m); | |
206 | ||
207 | if (m->dev_autofs_fd >= 0) | |
208 | return m->dev_autofs_fd; | |
209 | ||
210 | if ((m->dev_autofs_fd = open("/dev/autofs", O_RDONLY)) < 0) { | |
211 | log_error("Failed to open /dev/autofs: %s", strerror(errno)); | |
212 | return -errno; | |
213 | } | |
214 | ||
215 | init_autofs_dev_ioctl(¶m); | |
216 | if (ioctl(m->dev_autofs_fd, AUTOFS_DEV_IOCTL_VERSION, ¶m) < 0) { | |
217 | close_nointr_nofail(m->dev_autofs_fd); | |
218 | m->dev_autofs_fd = -1; | |
219 | return -errno; | |
220 | } | |
221 | ||
222 | log_debug("Autofs kernel version %i.%i", param.ver_major, param.ver_minor); | |
223 | ||
224 | return m->dev_autofs_fd; | |
225 | } | |
226 | ||
227 | static int open_ioctl_fd(int dev_autofs_fd, const char *where, dev_t devid) { | |
228 | struct autofs_dev_ioctl *param; | |
229 | size_t l; | |
230 | int r; | |
231 | ||
232 | assert(dev_autofs_fd >= 0); | |
233 | assert(where); | |
234 | ||
235 | l = sizeof(struct autofs_dev_ioctl) + strlen(where) + 1; | |
236 | ||
237 | if (!(param = malloc(l))) | |
238 | return -ENOMEM; | |
239 | ||
240 | init_autofs_dev_ioctl(param); | |
241 | param->size = l; | |
242 | param->ioctlfd = -1; | |
243 | param->openmount.devid = devid; | |
244 | strcpy(param->path, where); | |
245 | ||
246 | if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_OPENMOUNT, param) < 0) { | |
247 | r = -errno; | |
248 | goto finish; | |
249 | } | |
250 | ||
251 | if (param->ioctlfd < 0) { | |
252 | r = -EIO; | |
253 | goto finish; | |
254 | } | |
255 | ||
256 | r = param->ioctlfd; | |
257 | ||
258 | finish: | |
259 | free(param); | |
260 | return r; | |
261 | } | |
262 | ||
263 | static int autofs_protocol(int dev_autofs_fd, int ioctl_fd) { | |
264 | uint32_t major, minor; | |
265 | struct autofs_dev_ioctl param; | |
266 | ||
267 | assert(dev_autofs_fd >= 0); | |
268 | assert(ioctl_fd >= 0); | |
269 | ||
270 | init_autofs_dev_ioctl(¶m); | |
271 | param.ioctlfd = ioctl_fd; | |
272 | ||
273 | if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_PROTOVER, ¶m) < 0) | |
274 | return -errno; | |
275 | ||
276 | major = param.protover.version; | |
277 | ||
278 | init_autofs_dev_ioctl(¶m); | |
279 | param.ioctlfd = ioctl_fd; | |
280 | ||
281 | if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_PROTOSUBVER, ¶m) < 0) | |
282 | return -errno; | |
283 | ||
284 | minor = param.protosubver.sub_version; | |
285 | ||
286 | log_debug("Autofs protocol version %i.%i", major, minor); | |
287 | return 0; | |
288 | } | |
289 | ||
290 | static int autofs_set_timeout(int dev_autofs_fd, int ioctl_fd, time_t sec) { | |
291 | struct autofs_dev_ioctl param; | |
292 | ||
293 | assert(dev_autofs_fd >= 0); | |
294 | assert(ioctl_fd >= 0); | |
295 | ||
296 | init_autofs_dev_ioctl(¶m); | |
297 | param.ioctlfd = ioctl_fd; | |
298 | param.timeout.timeout = sec; | |
299 | ||
300 | if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_TIMEOUT, ¶m) < 0) | |
301 | return -errno; | |
302 | ||
303 | return 0; | |
304 | } | |
305 | ||
306 | static int autofs_send_ready(int dev_autofs_fd, int ioctl_fd, uint32_t token, int status) { | |
307 | struct autofs_dev_ioctl param; | |
308 | ||
309 | assert(dev_autofs_fd >= 0); | |
310 | assert(ioctl_fd >= 0); | |
311 | ||
312 | init_autofs_dev_ioctl(¶m); | |
313 | param.ioctlfd = ioctl_fd; | |
314 | ||
315 | if (status) { | |
316 | param.fail.token = token; | |
317 | param.fail.status = status; | |
318 | } else | |
319 | param.ready.token = token; | |
320 | ||
321 | if (ioctl(dev_autofs_fd, status ? AUTOFS_DEV_IOCTL_FAIL : AUTOFS_DEV_IOCTL_READY, ¶m) < 0) | |
322 | return -errno; | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
327 | int automount_send_ready(Automount *a, int status) { | |
328 | int ioctl_fd, r; | |
329 | unsigned token; | |
330 | ||
331 | assert(a); | |
332 | assert(status <= 0); | |
333 | ||
334 | if (set_isempty(a->tokens)) | |
335 | return 0; | |
336 | ||
337 | if ((ioctl_fd = open_ioctl_fd(UNIT(a)->meta.manager->dev_autofs_fd, a->where, a->dev_id)) < 0) { | |
338 | r = ioctl_fd; | |
339 | goto fail; | |
340 | } | |
341 | ||
342 | if (status) | |
343 | log_debug("Sending failure: %s", strerror(-status)); | |
344 | else | |
345 | log_debug("Sending success."); | |
346 | ||
347 | /* Autofs thankfully does not hand out 0 as a token */ | |
348 | while ((token = PTR_TO_UINT(set_steal_first(a->tokens)))) { | |
349 | int k; | |
350 | ||
351 | /* Autofs fun fact II: | |
352 | * | |
353 | * if you pass a positive status code here, the kernel will | |
354 | * freeze! Yay! */ | |
355 | ||
356 | if ((k = autofs_send_ready(UNIT(a)->meta.manager->dev_autofs_fd, | |
357 | ioctl_fd, | |
358 | token, | |
359 | status)) < 0) | |
360 | r = k; | |
361 | } | |
362 | ||
363 | r = 0; | |
364 | ||
365 | fail: | |
366 | if (ioctl_fd >= 0) | |
367 | close_nointr_nofail(ioctl_fd); | |
368 | ||
369 | return r; | |
370 | } | |
371 | ||
372 | static void automount_enter_waiting(Automount *a) { | |
373 | int p[2] = { -1, -1 }; | |
374 | char name[32], options[128]; | |
375 | bool mounted = false; | |
376 | int r, ioctl_fd = -1, dev_autofs_fd; | |
377 | struct stat st; | |
378 | ||
379 | assert(a); | |
380 | assert(a->pipe_fd < 0); | |
381 | assert(a->where); | |
382 | ||
383 | if (a->tokens) | |
384 | set_clear(a->tokens); | |
385 | else if (!(a->tokens = set_new(trivial_hash_func, trivial_compare_func))) { | |
386 | r = -ENOMEM; | |
387 | goto fail; | |
388 | } | |
389 | ||
390 | if ((dev_autofs_fd = open_dev_autofs(UNIT(a)->meta.manager)) < 0) { | |
391 | r = dev_autofs_fd; | |
392 | goto fail; | |
393 | } | |
394 | ||
395 | /* We knowingly ignore the results of this call */ | |
396 | mkdir_p(a->where, 0555); | |
397 | ||
398 | if (pipe2(p, O_NONBLOCK) < 0) { | |
399 | r = -errno; | |
400 | goto fail; | |
401 | } | |
402 | ||
403 | snprintf(options, sizeof(options), "fd=%i,pgrp=%u,minproto=5,maxproto=5,direct", p[1], (unsigned) getpgrp()); | |
404 | char_array_0(options); | |
405 | ||
406 | snprintf(name, sizeof(name), "systemd-%u", (unsigned) getpid()); | |
407 | char_array_0(name); | |
408 | ||
409 | if (mount(name, a->where, "autofs", 0, options) < 0) { | |
410 | r = -errno; | |
411 | goto fail; | |
412 | } | |
413 | ||
414 | mounted = true; | |
415 | ||
416 | close_nointr_nofail(p[1]); | |
417 | p[1] = -1; | |
418 | ||
419 | if (stat(a->where, &st) < 0) { | |
420 | r = -errno; | |
421 | goto fail; | |
422 | } | |
423 | ||
424 | if ((ioctl_fd = open_ioctl_fd(dev_autofs_fd, a->where, st.st_dev)) < 0) { | |
425 | r = ioctl_fd; | |
426 | goto fail; | |
427 | } | |
428 | ||
429 | if ((r = autofs_protocol(dev_autofs_fd, ioctl_fd)) < 0) | |
430 | goto fail; | |
431 | ||
432 | if ((r = autofs_set_timeout(dev_autofs_fd, ioctl_fd, 300)) < 0) | |
433 | goto fail; | |
434 | ||
435 | /* Autofs fun fact: | |
436 | * | |
437 | * Unless we close the ioctl fd here, for some weird reason | |
438 | * the direct mount will not receive events from the | |
439 | * kernel. */ | |
440 | ||
441 | close_nointr_nofail(ioctl_fd); | |
442 | ioctl_fd = -1; | |
443 | ||
444 | if ((r = unit_watch_fd(UNIT(a), p[0], EPOLLIN, &a->pipe_watch)) < 0) | |
445 | goto fail; | |
446 | ||
447 | a->pipe_fd = p[0]; | |
448 | a->dev_id = st.st_dev; | |
449 | ||
450 | automount_set_state(a, AUTOMOUNT_WAITING); | |
451 | ||
452 | return; | |
453 | ||
454 | fail: | |
455 | assert_se(close_pipe(p) == 0); | |
456 | ||
457 | if (ioctl_fd >= 0) | |
458 | close_nointr_nofail(ioctl_fd); | |
459 | ||
460 | if (mounted) | |
461 | repeat_unmout(a->where); | |
462 | ||
463 | log_error("Failed to initialize automounter: %s", strerror(-r)); | |
464 | automount_enter_dead(a, false); | |
465 | } | |
466 | ||
467 | static void automount_enter_runnning(Automount *a) { | |
468 | int r; | |
469 | struct stat st; | |
470 | ||
471 | assert(a); | |
472 | assert(a->mount); | |
473 | ||
474 | /* Before we do anything, let's see if somebody is playing games with us? */ | |
475 | ||
476 | if (stat(a->where, &st) < 0) { | |
477 | log_warning("%s failed stat automount point: %m", a->meta.id); | |
478 | goto fail; | |
479 | } | |
480 | ||
481 | if (!S_ISDIR(st.st_mode) || st.st_dev != a->dev_id) | |
482 | log_info("%s's automount point already active?", a->meta.id); | |
483 | else if ((r = manager_add_job(UNIT(a)->meta.manager, JOB_START, UNIT(a->mount), JOB_REPLACE, true, NULL)) < 0) { | |
484 | log_warning("%s failed to queue mount startup job: %s", a->meta.id, strerror(-r)); | |
485 | goto fail; | |
486 | } | |
487 | ||
488 | automount_set_state(a, AUTOMOUNT_RUNNING); | |
489 | return; | |
490 | ||
491 | fail: | |
492 | automount_enter_dead(a, false); | |
493 | } | |
494 | ||
495 | static int automount_start(Unit *u) { | |
496 | Automount *a = AUTOMOUNT(u); | |
497 | ||
498 | assert(a); | |
499 | ||
500 | if (path_is_mount_point(a->where)) { | |
501 | log_error("Path %s is already a mount point, refusing start for %s", a->where, u->meta.id); | |
502 | return -EEXIST; | |
503 | } | |
504 | ||
505 | assert(a->state == AUTOMOUNT_DEAD || a->state == AUTOMOUNT_MAINTAINANCE); | |
506 | ||
507 | a->failure = false; | |
508 | automount_enter_waiting(a); | |
509 | return 0; | |
510 | } | |
511 | ||
512 | static int automount_stop(Unit *u) { | |
513 | Automount *a = AUTOMOUNT(u); | |
514 | ||
515 | assert(a); | |
516 | ||
517 | assert(a->state == AUTOMOUNT_WAITING || a->state == AUTOMOUNT_RUNNING); | |
518 | ||
519 | automount_enter_dead(a, true); | |
520 | return 0; | |
521 | } | |
522 | ||
87f0e418 LP |
523 | static UnitActiveState automount_active_state(Unit *u) { |
524 | ||
e537352b | 525 | return state_translation_table[AUTOMOUNT(u)->state]; |
5cb5a6ff LP |
526 | } |
527 | ||
10a94420 LP |
528 | static const char *automount_sub_state_to_string(Unit *u) { |
529 | assert(u); | |
530 | ||
531 | return state_string_table[AUTOMOUNT(u)->state]; | |
532 | } | |
533 | ||
8d567588 LP |
534 | static void automount_fd_event(Unit *u, int fd, uint32_t events, Watch *w) { |
535 | union autofs_v5_packet_union packet; | |
536 | ssize_t l; | |
537 | int r; | |
538 | ||
539 | Automount *a = AUTOMOUNT(u); | |
540 | ||
541 | assert(a); | |
542 | assert(fd == a->pipe_fd); | |
543 | ||
544 | if (events != EPOLLIN) { | |
545 | log_error("Got invalid poll event on pipe."); | |
546 | goto fail; | |
547 | } | |
548 | ||
549 | if ((l = loop_read(a->pipe_fd, &packet, sizeof(packet))) != sizeof(packet)) { | |
550 | log_error("Invalid read from pipe: %s", l < 0 ? strerror(-l) : "short read"); | |
551 | goto fail; | |
552 | } | |
553 | ||
554 | switch (packet.hdr.type) { | |
555 | ||
556 | case autofs_ptype_missing_direct: | |
557 | log_debug("Got direct mount request for %s", packet.v5_packet.name); | |
558 | ||
559 | if ((r = set_put(a->tokens, UINT_TO_PTR(packet.v5_packet.wait_queue_token))) < 0) { | |
560 | log_error("Failed to remember token: %s", strerror(-r)); | |
561 | goto fail; | |
562 | } | |
563 | ||
564 | automount_enter_runnning(a); | |
565 | break; | |
566 | ||
567 | default: | |
568 | log_error("Received unknown automount request %i", packet.hdr.type); | |
569 | break; | |
570 | } | |
571 | ||
572 | return; | |
573 | ||
574 | fail: | |
575 | automount_enter_dead(a, false); | |
576 | } | |
577 | ||
578 | static void automount_shutdown(Manager *m) { | |
579 | assert(m); | |
580 | ||
581 | if (m->dev_autofs_fd >= 0) | |
582 | close_nointr_nofail(m->dev_autofs_fd); | |
583 | } | |
584 | ||
87f0e418 | 585 | const UnitVTable automount_vtable = { |
8d567588 | 586 | .suffix = ".automount", |
5cb5a6ff | 587 | |
e537352b | 588 | .no_alias = true, |
8d567588 | 589 | .no_instances = true, |
e537352b | 590 | |
034c6ed7 | 591 | .init = automount_init, |
e537352b | 592 | .load = automount_load, |
034c6ed7 | 593 | .done = automount_done, |
5cb5a6ff | 594 | |
034c6ed7 | 595 | .dump = automount_dump, |
5cb5a6ff | 596 | |
8d567588 LP |
597 | .start = automount_start, |
598 | .stop = automount_stop, | |
599 | ||
10a94420 | 600 | .active_state = automount_active_state, |
8d567588 LP |
601 | .sub_state_to_string = automount_sub_state_to_string, |
602 | ||
603 | .fd_event = automount_fd_event, | |
604 | ||
605 | .shutdown = automount_shutdown | |
5cb5a6ff | 606 | }; |