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