1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
11 #include "load-fragment.h"
12 #include "load-dropin.h"
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,
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"
31 static void mount_done(Unit *u) {
39 static void mount_set_state(Mount *m, MountState state) {
43 if (state == m->state)
49 log_debug("%s changed %s → %s", unit_id(UNIT(m)), state_string_table[old_state], state_string_table[state]);
51 unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state]);
54 static int mount_coldplug(Unit *u) {
58 assert(m->state == MOUNT_DEAD);
60 if (m->from_proc_self_mountinfo)
61 mount_set_state(m, MOUNT_MOUNTED);
66 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
75 "%sFrom /etc/fstab: %s\n"
76 "%sFrom /proc/self/mountinfo: %s\n",
77 prefix, state_string_table[s->state],
80 prefix, yes_no(s->from_etc_fstab),
81 prefix, yes_no(s->from_proc_self_mountinfo));
84 static UnitActiveState mount_active_state(Unit *u) {
87 return state_translation_table[MOUNT(u)->state];
90 static void mount_shutdown(Manager *m) {
93 if (m->proc_self_mountinfo)
94 fclose(m->proc_self_mountinfo);
97 static int mount_add_node_links(Mount *m) {
104 /* Adds in links to the device that this node is based on */
106 if (!path_startswith(m->what, "/dev/"))
109 if (!(e = unit_name_escape_path("node-", m->what+1, ".device")))
112 r = manager_load_unit(UNIT(m)->meta.manager, e, &device);
118 if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, device)) < 0)
121 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, device)) < 0)
124 if ((r = unit_add_dependency(device, UNIT_WANTS, UNIT(m))) < 0)
130 static int mount_add_path_links(Mount *m) {
134 /* Adds in link to other mount points, that might lie below or
135 * above us in the hierarchy */
137 LIST_FOREACH(units_per_type, other, UNIT(m)->meta.manager->units_per_type[UNIT_MOUNT]) {
145 if (path_startswith(m->where, n->where)) {
147 if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, (Unit*) other)) < 0)
150 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, (Unit*) other)) < 0)
153 } else if (startswith(n->where, m->where)) {
155 if ((r = unit_add_dependency(UNIT(m), UNIT_BEFORE, (Unit*) other)) < 0)
158 if ((r = unit_add_dependency((Unit*) other, UNIT_REQUIRES, UNIT(m))) < 0)
166 static int mount_add_one(Manager *m, const char *what, const char *where, bool live, bool set_flags) {
176 /* probably some kind of swap, which we don't cover for now */
180 if (streq(where, "/"))
181 e = strdup("rootfs.mount");
183 e = unit_name_escape_path("fs-", where+1, ".mount");
188 if (!(u = manager_get_unit(m, e))) {
191 if (!(u = unit_new(m))) {
196 r = unit_add_name(u, e);
202 if (!(MOUNT(u)->what = strdup(what)) ||
203 !(MOUNT(u)->where = strdup(where))) {
208 if ((r = unit_set_description(u, where)) < 0)
211 unit_add_to_load_queue(u);
218 MOUNT(u)->still_exists = true;
222 MOUNT(u)->just_created = !MOUNT(u)->from_proc_self_mountinfo;
223 MOUNT(u)->from_proc_self_mountinfo = true;
226 MOUNT(u)->just_created = !MOUNT(u)->from_etc_fstab;
227 MOUNT(u)->from_etc_fstab = true;
230 if ((r = mount_add_node_links(MOUNT(u))) < 0)
233 if ((r = mount_add_path_links(MOUNT(u))) < 0)
245 static char *fstab_node_to_udev_node(char *p) {
249 /* FIXME: to follow udev's logic 100% we need to leave valid
250 * UTF8 chars unescaped */
252 if (startswith(p, "LABEL=")) {
254 if (!(t = xescape(p+6, "/ ")))
257 r = asprintf(&dn, "/dev/disk/by-label/%s", t);
266 if (startswith(p, "UUID=")) {
268 if (!(t = xescape(p+5, "/ ")))
271 r = asprintf(&dn, "/dev/disk/by-uuid/%s", ascii_strlower(t));
283 static int mount_load_etc_fstab(Manager *m, bool set_flags) {
291 if (!(f = setmntent("/etc/fstab", "r")))
294 while ((me = getmntent(f))) {
297 if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
302 if (!(where = strdup(me->mnt_dir))) {
309 path_kill_slashes(what);
312 path_kill_slashes(where);
314 r = mount_add_one(m, what, where, false, set_flags);
329 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
334 rewind(m->proc_self_mountinfo);
338 char *device, *path, *d, *p;
340 if ((k = fscanf(m->proc_self_mountinfo,
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 */
350 "%ms" /* (10) mount source */
351 "%*[^\n]", /* some rubbish at the end */
361 if (!(d = cunescape(device))) {
368 if (!(p = cunescape(path))) {
375 r = mount_add_one(m, d, p, true, set_flags);
386 static int mount_enumerate(Manager *m) {
388 struct epoll_event ev;
391 if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "r")))
394 m->mount_watch.type = WATCH_MOUNT;
395 m->mount_watch.fd = fileno(m->proc_self_mountinfo);
398 ev.events = EPOLLERR;
399 ev.data.ptr = &m->mount_watch;
401 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
404 if ((r = mount_load_etc_fstab(m, false)) < 0)
407 if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
417 void mount_fd_event(Manager *m, int events) {
422 assert(events == EPOLLERR);
424 /* The manager calls this for every fd event happening on the
425 * /proc/self/mountinfo file, which informs us about mounting
428 if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
429 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-errno));
433 manager_dispatch_load_queue(m);
435 LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
436 Mount *mount = (Mount*) meta;
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;
445 /* Clear the flags for later calls */
446 mount->just_created = false;
447 mount->still_exists = false;
451 const UnitVTable mount_vtable = {
454 .init = unit_load_fragment_and_dropin,
456 .coldplug = mount_coldplug,
460 .active_state = mount_active_state,
462 .enumerate = mount_enumerate,
463 .shutdown = mount_shutdown