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Commit | Line | Data |
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5cb5a6ff LP |
1 | /*-*- Mode: C; c-basic-offset: 8 -*-*/ |
2 | ||
3 | #include <errno.h> | |
b08d03ff LP |
4 | #include <stdio.h> |
5 | #include <mntent.h> | |
ef734fd6 LP |
6 | #include <sys/epoll.h> |
7 | #include <sys/poll.h> | |
5cb5a6ff | 8 | |
87f0e418 | 9 | #include "unit.h" |
5cb5a6ff LP |
10 | #include "mount.h" |
11 | #include "load-fragment.h" | |
5cb5a6ff | 12 | #include "load-dropin.h" |
b08d03ff | 13 | #include "log.h" |
5cb5a6ff | 14 | |
f50e0a01 LP |
15 | static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = { |
16 | [MOUNT_DEAD] = UNIT_INACTIVE, | |
17 | [MOUNT_MOUNTING] = UNIT_ACTIVATING, | |
18 | [MOUNT_MOUNTED] = UNIT_ACTIVE, | |
19 | [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING, | |
20 | [MOUNT_MAINTAINANCE] = UNIT_INACTIVE, | |
21 | }; | |
5cb5a6ff | 22 | |
f50e0a01 LP |
23 | static const char* const state_string_table[_MOUNT_STATE_MAX] = { |
24 | [MOUNT_DEAD] = "dead", | |
25 | [MOUNT_MOUNTING] = "mounting", | |
26 | [MOUNT_MOUNTED] = "mounted", | |
27 | [MOUNT_UNMOUNTING] = "unmounting", | |
28 | [MOUNT_MAINTAINANCE] = "maintainance" | |
29 | }; | |
5cb5a6ff | 30 | |
87f0e418 | 31 | static void mount_done(Unit *u) { |
ef734fd6 | 32 | Mount *m = MOUNT(u); |
034c6ed7 | 33 | |
ef734fd6 LP |
34 | assert(m); |
35 | free(m->what); | |
36 | free(m->where); | |
034c6ed7 LP |
37 | } |
38 | ||
f50e0a01 LP |
39 | static void mount_set_state(Mount *m, MountState state) { |
40 | MountState old_state; | |
41 | assert(m); | |
42 | ||
ef734fd6 LP |
43 | if (state == m->state) |
44 | return; | |
45 | ||
f50e0a01 LP |
46 | old_state = m->state; |
47 | m->state = state; | |
48 | ||
49 | log_debug("%s changed %s → %s", unit_id(UNIT(m)), state_string_table[old_state], state_string_table[state]); | |
50 | ||
51 | unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state]); | |
52 | } | |
53 | ||
54 | static int mount_coldplug(Unit *u) { | |
55 | Mount *m = MOUNT(u); | |
56 | ||
57 | assert(m); | |
58 | assert(m->state == MOUNT_DEAD); | |
5cb5a6ff | 59 | |
f50e0a01 LP |
60 | if (m->from_proc_self_mountinfo) |
61 | mount_set_state(m, MOUNT_MOUNTED); | |
5cb5a6ff | 62 | |
f50e0a01 LP |
63 | return 0; |
64 | } | |
65 | ||
66 | static void mount_dump(Unit *u, FILE *f, const char *prefix) { | |
87f0e418 | 67 | Mount *s = MOUNT(u); |
5cb5a6ff LP |
68 | |
69 | assert(s); | |
70 | ||
71 | fprintf(f, | |
72 | "%sMount State: %s\n" | |
b08d03ff | 73 | "%sWhere: %s\n" |
f50e0a01 LP |
74 | "%sWhat: %s\n" |
75 | "%sFrom /etc/fstab: %s\n" | |
76 | "%sFrom /proc/self/mountinfo: %s\n", | |
77 | prefix, state_string_table[s->state], | |
b08d03ff | 78 | prefix, s->where, |
f50e0a01 LP |
79 | prefix, s->what, |
80 | prefix, yes_no(s->from_etc_fstab), | |
81 | prefix, yes_no(s->from_proc_self_mountinfo)); | |
82 | } | |
83 | ||
84 | static UnitActiveState mount_active_state(Unit *u) { | |
85 | assert(u); | |
86 | ||
87 | return state_translation_table[MOUNT(u)->state]; | |
b08d03ff LP |
88 | } |
89 | ||
90 | static void mount_shutdown(Manager *m) { | |
ef734fd6 LP |
91 | assert(m); |
92 | ||
93 | if (m->proc_self_mountinfo) | |
94 | fclose(m->proc_self_mountinfo); | |
b08d03ff LP |
95 | } |
96 | ||
97 | static int mount_add_node_links(Mount *m) { | |
98 | Unit *device; | |
99 | char *e; | |
100 | int r; | |
101 | ||
102 | assert(m); | |
103 | ||
104 | /* Adds in links to the device that this node is based on */ | |
105 | ||
106 | if (!path_startswith(m->what, "/dev/")) | |
107 | return 0; | |
108 | ||
109 | if (!(e = unit_name_escape_path("node-", m->what+1, ".device"))) | |
110 | return -ENOMEM; | |
111 | ||
112 | r = manager_load_unit(UNIT(m)->meta.manager, e, &device); | |
113 | free(e); | |
114 | ||
115 | if (r < 0) | |
116 | return r; | |
117 | ||
118 | if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, device)) < 0) | |
119 | return r; | |
120 | ||
121 | if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, device)) < 0) | |
122 | return r; | |
123 | ||
124 | if ((r = unit_add_dependency(device, UNIT_WANTS, UNIT(m))) < 0) | |
125 | return r; | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | static int mount_add_path_links(Mount *m) { | |
ef734fd6 | 131 | Meta *other; |
b08d03ff LP |
132 | int r; |
133 | ||
134 | /* Adds in link to other mount points, that might lie below or | |
135 | * above us in the hierarchy */ | |
136 | ||
ef734fd6 | 137 | LIST_FOREACH(units_per_type, other, UNIT(m)->meta.manager->units_per_type[UNIT_MOUNT]) { |
b08d03ff LP |
138 | Mount *n; |
139 | ||
ef734fd6 | 140 | n = (Mount*) other; |
b08d03ff | 141 | |
ef734fd6 LP |
142 | if (n == m) |
143 | return 0; | |
b08d03ff LP |
144 | |
145 | if (path_startswith(m->where, n->where)) { | |
146 | ||
ef734fd6 | 147 | if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, (Unit*) other)) < 0) |
b08d03ff LP |
148 | return r; |
149 | ||
ef734fd6 | 150 | if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, (Unit*) other)) < 0) |
b08d03ff LP |
151 | return r; |
152 | ||
153 | } else if (startswith(n->where, m->where)) { | |
154 | ||
ef734fd6 | 155 | if ((r = unit_add_dependency(UNIT(m), UNIT_BEFORE, (Unit*) other)) < 0) |
b08d03ff LP |
156 | return r; |
157 | ||
ef734fd6 | 158 | if ((r = unit_add_dependency((Unit*) other, UNIT_REQUIRES, UNIT(m))) < 0) |
b08d03ff LP |
159 | return r; |
160 | } | |
161 | } | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
ef734fd6 | 166 | static int mount_add_one(Manager *m, const char *what, const char *where, bool live, bool set_flags) { |
b08d03ff LP |
167 | char *e; |
168 | int r; | |
169 | Unit *u; | |
170 | bool delete; | |
171 | ||
f50e0a01 | 172 | assert(m); |
b08d03ff LP |
173 | assert(what); |
174 | assert(where); | |
175 | ||
176 | /* probably some kind of swap, which we don't cover for now */ | |
177 | if (where[0] != '/') | |
178 | return 0; | |
179 | ||
180 | if (streq(where, "/")) | |
181 | e = strdup("rootfs.mount"); | |
182 | else | |
183 | e = unit_name_escape_path("fs-", where+1, ".mount"); | |
184 | ||
185 | if (!e) | |
186 | return -ENOMEM; | |
187 | ||
188 | if (!(u = manager_get_unit(m, e))) { | |
189 | delete = true; | |
190 | ||
191 | if (!(u = unit_new(m))) { | |
192 | free(e); | |
193 | return -ENOMEM; | |
194 | } | |
195 | ||
196 | r = unit_add_name(u, e); | |
197 | free(e); | |
198 | ||
199 | if (r < 0) | |
200 | goto fail; | |
201 | ||
202 | if (!(MOUNT(u)->what = strdup(what)) || | |
f50e0a01 LP |
203 | !(MOUNT(u)->where = strdup(where))) { |
204 | r = -ENOMEM; | |
205 | goto fail; | |
206 | } | |
207 | ||
208 | if ((r = unit_set_description(u, where)) < 0) | |
b08d03ff | 209 | goto fail; |
ef734fd6 | 210 | |
f94ea366 | 211 | unit_add_to_load_queue(u); |
b08d03ff LP |
212 | } else { |
213 | delete = false; | |
214 | free(e); | |
215 | } | |
216 | ||
ef734fd6 LP |
217 | if (set_flags) |
218 | MOUNT(u)->still_exists = true; | |
219 | ||
220 | if (live) { | |
221 | if (set_flags) | |
222 | MOUNT(u)->just_created = !MOUNT(u)->from_proc_self_mountinfo; | |
f50e0a01 | 223 | MOUNT(u)->from_proc_self_mountinfo = true; |
ef734fd6 LP |
224 | } else { |
225 | if (set_flags) | |
226 | MOUNT(u)->just_created = !MOUNT(u)->from_etc_fstab; | |
f50e0a01 | 227 | MOUNT(u)->from_etc_fstab = true; |
ef734fd6 | 228 | } |
f50e0a01 | 229 | |
b08d03ff LP |
230 | if ((r = mount_add_node_links(MOUNT(u))) < 0) |
231 | goto fail; | |
232 | ||
233 | if ((r = mount_add_path_links(MOUNT(u))) < 0) | |
234 | goto fail; | |
235 | ||
b08d03ff LP |
236 | return 0; |
237 | ||
238 | fail: | |
239 | if (delete && u) | |
240 | unit_free(u); | |
241 | ||
242 | return 0; | |
243 | } | |
244 | ||
245 | static char *fstab_node_to_udev_node(char *p) { | |
246 | char *dn, *t; | |
247 | int r; | |
248 | ||
249 | /* FIXME: to follow udev's logic 100% we need to leave valid | |
250 | * UTF8 chars unescaped */ | |
251 | ||
252 | if (startswith(p, "LABEL=")) { | |
253 | ||
f50e0a01 | 254 | if (!(t = xescape(p+6, "/ "))) |
b08d03ff LP |
255 | return NULL; |
256 | ||
f50e0a01 | 257 | r = asprintf(&dn, "/dev/disk/by-label/%s", t); |
b08d03ff LP |
258 | free(t); |
259 | ||
260 | if (r < 0) | |
261 | return NULL; | |
262 | ||
263 | return dn; | |
264 | } | |
265 | ||
266 | if (startswith(p, "UUID=")) { | |
267 | ||
f50e0a01 | 268 | if (!(t = xescape(p+5, "/ "))) |
b08d03ff LP |
269 | return NULL; |
270 | ||
f50e0a01 | 271 | r = asprintf(&dn, "/dev/disk/by-uuid/%s", ascii_strlower(t)); |
b08d03ff LP |
272 | free(t); |
273 | ||
274 | if (r < 0) | |
275 | return NULL; | |
276 | ||
277 | return dn; | |
278 | } | |
279 | ||
280 | return strdup(p); | |
281 | } | |
282 | ||
ef734fd6 | 283 | static int mount_load_etc_fstab(Manager *m, bool set_flags) { |
b08d03ff LP |
284 | FILE *f; |
285 | int r; | |
286 | struct mntent* me; | |
287 | ||
288 | assert(m); | |
289 | ||
290 | errno = 0; | |
291 | if (!(f = setmntent("/etc/fstab", "r"))) | |
292 | return -errno; | |
293 | ||
294 | while ((me = getmntent(f))) { | |
295 | char *where, *what; | |
296 | ||
297 | if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) { | |
298 | r = -ENOMEM; | |
299 | goto finish; | |
300 | } | |
301 | ||
302 | if (!(where = strdup(me->mnt_dir))) { | |
303 | free(what); | |
304 | r = -ENOMEM; | |
305 | goto finish; | |
306 | } | |
307 | ||
308 | if (what[0] == '/') | |
309 | path_kill_slashes(what); | |
310 | ||
311 | if (where[0] == '/') | |
312 | path_kill_slashes(where); | |
313 | ||
ef734fd6 | 314 | r = mount_add_one(m, what, where, false, set_flags); |
b08d03ff LP |
315 | free(what); |
316 | free(where); | |
317 | ||
318 | if (r < 0) | |
319 | goto finish; | |
320 | } | |
321 | ||
322 | r = 0; | |
323 | finish: | |
324 | ||
325 | endmntent(f); | |
326 | return r; | |
327 | } | |
328 | ||
ef734fd6 | 329 | static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) { |
b08d03ff LP |
330 | int r; |
331 | ||
332 | assert(m); | |
333 | ||
ef734fd6 | 334 | rewind(m->proc_self_mountinfo); |
b08d03ff LP |
335 | |
336 | for (;;) { | |
337 | int k; | |
338 | char *device, *path, *d, *p; | |
339 | ||
ef734fd6 | 340 | if ((k = fscanf(m->proc_self_mountinfo, |
b08d03ff LP |
341 | "%*s " /* (1) mount id */ |
342 | "%*s " /* (2) parent id */ | |
343 | "%*s " /* (3) major:minor */ | |
344 | "%*s " /* (4) root */ | |
345 | "%ms " /* (5) mount point */ | |
346 | "%*s" /* (6) mount options */ | |
347 | "%*[^-]" /* (7) optional fields */ | |
348 | "- " /* (8) seperator */ | |
349 | "%*s " /* (9) file system type */ | |
ef734fd6 LP |
350 | "%ms" /* (10) mount source */ |
351 | "%*[^\n]", /* some rubbish at the end */ | |
b08d03ff LP |
352 | &path, |
353 | &device)) != 2) { | |
354 | ||
ef734fd6 LP |
355 | if (k == EOF) |
356 | break; | |
b08d03ff | 357 | |
ef734fd6 | 358 | return -EBADMSG; |
b08d03ff LP |
359 | } |
360 | ||
361 | if (!(d = cunescape(device))) { | |
362 | free(device); | |
363 | free(path); | |
ef734fd6 | 364 | return -ENOMEM; |
b08d03ff LP |
365 | } |
366 | free(device); | |
367 | ||
368 | if (!(p = cunescape(path))) { | |
369 | free(d); | |
370 | free(path); | |
ef734fd6 | 371 | return -ENOMEM; |
b08d03ff LP |
372 | } |
373 | free(path); | |
374 | ||
ef734fd6 | 375 | r = mount_add_one(m, d, p, true, set_flags); |
b08d03ff LP |
376 | free(d); |
377 | free(p); | |
378 | ||
379 | if (r < 0) | |
ef734fd6 | 380 | return r; |
b08d03ff LP |
381 | } |
382 | ||
ef734fd6 | 383 | return 0; |
b08d03ff LP |
384 | } |
385 | ||
386 | static int mount_enumerate(Manager *m) { | |
387 | int r; | |
ef734fd6 | 388 | struct epoll_event ev; |
b08d03ff LP |
389 | assert(m); |
390 | ||
ef734fd6 LP |
391 | if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "r"))) |
392 | return -errno; | |
393 | ||
394 | m->mount_watch.type = WATCH_MOUNT; | |
395 | m->mount_watch.fd = fileno(m->proc_self_mountinfo); | |
396 | ||
397 | zero(ev); | |
398 | ev.events = EPOLLERR; | |
399 | ev.data.ptr = &m->mount_watch; | |
400 | ||
401 | if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0) | |
402 | return -errno; | |
403 | ||
404 | if ((r = mount_load_etc_fstab(m, false)) < 0) | |
b08d03ff LP |
405 | goto fail; |
406 | ||
ef734fd6 | 407 | if ((r = mount_load_proc_self_mountinfo(m, false)) < 0) |
b08d03ff LP |
408 | goto fail; |
409 | ||
410 | return 0; | |
411 | ||
412 | fail: | |
413 | mount_shutdown(m); | |
414 | return r; | |
5cb5a6ff LP |
415 | } |
416 | ||
ef734fd6 LP |
417 | void mount_fd_event(Manager *m, int events) { |
418 | Meta *meta; | |
419 | int r; | |
420 | ||
421 | assert(m); | |
f94ea366 | 422 | assert(events == EPOLLERR); |
ef734fd6 LP |
423 | |
424 | /* The manager calls this for every fd event happening on the | |
425 | * /proc/self/mountinfo file, which informs us about mounting | |
426 | * table changes */ | |
427 | ||
428 | if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) { | |
429 | log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-errno)); | |
430 | return; | |
431 | } | |
432 | ||
433 | manager_dispatch_load_queue(m); | |
434 | ||
435 | LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) { | |
436 | Mount *mount = (Mount*) meta; | |
437 | ||
438 | if (mount->just_created && mount->state == MOUNT_DEAD) | |
439 | mount_set_state(mount, MOUNT_MOUNTED); | |
440 | else if (!mount->still_exists && mount->state == MOUNT_MOUNTED) { | |
441 | mount_set_state(mount, MOUNT_DEAD); | |
442 | mount->from_proc_self_mountinfo = false; | |
443 | } | |
444 | ||
445 | /* Clear the flags for later calls */ | |
446 | mount->just_created = false; | |
447 | mount->still_exists = false; | |
448 | } | |
449 | } | |
450 | ||
87f0e418 | 451 | const UnitVTable mount_vtable = { |
5cb5a6ff LP |
452 | .suffix = ".mount", |
453 | ||
f50e0a01 | 454 | .init = unit_load_fragment_and_dropin, |
034c6ed7 | 455 | .done = mount_done, |
f50e0a01 LP |
456 | .coldplug = mount_coldplug, |
457 | ||
034c6ed7 | 458 | .dump = mount_dump, |
5cb5a6ff | 459 | |
f50e0a01 | 460 | .active_state = mount_active_state, |
b08d03ff | 461 | |
f50e0a01 LP |
462 | .enumerate = mount_enumerate, |
463 | .shutdown = mount_shutdown | |
5cb5a6ff | 464 | }; |