1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
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.
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.
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/>.
25 #include <sys/epoll.h>
30 #include "load-fragment.h"
31 #include "load-dropin.h"
34 static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
35 [MOUNT_DEAD] = UNIT_INACTIVE,
36 [MOUNT_MOUNTING] = UNIT_ACTIVATING,
37 [MOUNT_MOUNTED] = UNIT_ACTIVE,
38 [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
39 [MOUNT_MAINTAINANCE] = UNIT_INACTIVE,
42 static const char* const state_string_table[_MOUNT_STATE_MAX] = {
43 [MOUNT_DEAD] = "dead",
44 [MOUNT_MOUNTING] = "mounting",
45 [MOUNT_MOUNTED] = "mounted",
46 [MOUNT_UNMOUNTING] = "unmounting",
47 [MOUNT_MAINTAINANCE] = "maintainance"
50 static void mount_done(Unit *u) {
58 static void mount_set_state(Mount *m, MountState state) {
62 if (state == m->state)
68 log_debug("%s changed %s → %s", unit_id(UNIT(m)), state_string_table[old_state], state_string_table[state]);
70 unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state]);
73 static int mount_coldplug(Unit *u) {
77 assert(m->state == MOUNT_DEAD);
79 if (m->from_proc_self_mountinfo)
80 mount_set_state(m, MOUNT_MOUNTED);
85 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
94 "%sFrom /etc/fstab: %s\n"
95 "%sFrom /proc/self/mountinfo: %s\n",
96 prefix, state_string_table[s->state],
99 prefix, yes_no(s->from_etc_fstab),
100 prefix, yes_no(s->from_proc_self_mountinfo));
103 static UnitActiveState mount_active_state(Unit *u) {
106 return state_translation_table[MOUNT(u)->state];
109 static void mount_shutdown(Manager *m) {
112 if (m->proc_self_mountinfo)
113 fclose(m->proc_self_mountinfo);
116 static int mount_add_node_links(Mount *m) {
123 /* Adds in links to the device that this node is based on */
125 if (!path_startswith(m->what, "/dev/"))
128 if (!(e = unit_name_escape_path("node-", m->what+1, ".device")))
131 r = manager_load_unit(UNIT(m)->meta.manager, e, &device);
137 if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, device)) < 0)
140 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, device)) < 0)
143 if ((r = unit_add_dependency(device, UNIT_WANTS, UNIT(m))) < 0)
149 static int mount_add_path_links(Mount *m) {
153 /* Adds in link to other mount points, that might lie below or
154 * above us in the hierarchy */
156 LIST_FOREACH(units_per_type, other, UNIT(m)->meta.manager->units_per_type[UNIT_MOUNT]) {
164 if (path_startswith(m->where, n->where)) {
166 if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, (Unit*) other)) < 0)
169 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, (Unit*) other)) < 0)
172 } else if (startswith(n->where, m->where)) {
174 if ((r = unit_add_dependency(UNIT(m), UNIT_BEFORE, (Unit*) other)) < 0)
177 if ((r = unit_add_dependency((Unit*) other, UNIT_REQUIRES, UNIT(m))) < 0)
185 static int mount_add_one(Manager *m, const char *what, const char *where, bool live, bool set_flags) {
195 /* probably some kind of swap, which we don't cover for now */
199 if (streq(where, "/"))
200 e = strdup("rootfs.mount");
202 e = unit_name_escape_path("fs-", where+1, ".mount");
207 if (!(u = manager_get_unit(m, e))) {
210 if (!(u = unit_new(m))) {
215 r = unit_add_name(u, e);
221 if (!(MOUNT(u)->what = strdup(what)) ||
222 !(MOUNT(u)->where = strdup(where))) {
227 if ((r = unit_set_description(u, where)) < 0)
230 unit_add_to_load_queue(u);
237 MOUNT(u)->still_exists = true;
241 MOUNT(u)->just_created = !MOUNT(u)->from_proc_self_mountinfo;
242 MOUNT(u)->from_proc_self_mountinfo = true;
245 MOUNT(u)->just_created = !MOUNT(u)->from_etc_fstab;
246 MOUNT(u)->from_etc_fstab = true;
249 if ((r = mount_add_node_links(MOUNT(u))) < 0)
252 if ((r = mount_add_path_links(MOUNT(u))) < 0)
264 static char *fstab_node_to_udev_node(char *p) {
268 /* FIXME: to follow udev's logic 100% we need to leave valid
269 * UTF8 chars unescaped */
271 if (startswith(p, "LABEL=")) {
273 if (!(t = xescape(p+6, "/ ")))
276 r = asprintf(&dn, "/dev/disk/by-label/%s", t);
285 if (startswith(p, "UUID=")) {
287 if (!(t = xescape(p+5, "/ ")))
290 r = asprintf(&dn, "/dev/disk/by-uuid/%s", ascii_strlower(t));
302 static int mount_load_etc_fstab(Manager *m, bool set_flags) {
310 if (!(f = setmntent("/etc/fstab", "r")))
313 while ((me = getmntent(f))) {
316 if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
321 if (!(where = strdup(me->mnt_dir))) {
328 path_kill_slashes(what);
331 path_kill_slashes(where);
333 r = mount_add_one(m, what, where, false, set_flags);
348 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
353 rewind(m->proc_self_mountinfo);
357 char *device, *path, *d, *p;
359 if ((k = fscanf(m->proc_self_mountinfo,
360 "%*s " /* (1) mount id */
361 "%*s " /* (2) parent id */
362 "%*s " /* (3) major:minor */
363 "%*s " /* (4) root */
364 "%ms " /* (5) mount point */
365 "%*s" /* (6) mount options */
366 "%*[^-]" /* (7) optional fields */
367 "- " /* (8) seperator */
368 "%*s " /* (9) file system type */
369 "%ms" /* (10) mount source */
370 "%*[^\n]", /* some rubbish at the end */
380 if (!(d = cunescape(device))) {
387 if (!(p = cunescape(path))) {
394 r = mount_add_one(m, d, p, true, set_flags);
405 static int mount_enumerate(Manager *m) {
407 struct epoll_event ev;
410 if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "r")))
413 m->mount_watch.type = WATCH_MOUNT;
414 m->mount_watch.fd = fileno(m->proc_self_mountinfo);
417 ev.events = EPOLLERR;
418 ev.data.ptr = &m->mount_watch;
420 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
423 if ((r = mount_load_etc_fstab(m, false)) < 0)
426 if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
436 void mount_fd_event(Manager *m, int events) {
441 assert(events == EPOLLERR);
443 /* The manager calls this for every fd event happening on the
444 * /proc/self/mountinfo file, which informs us about mounting
447 if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
448 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-errno));
452 manager_dispatch_load_queue(m);
454 LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
455 Mount *mount = (Mount*) meta;
457 if (mount->just_created && mount->state == MOUNT_DEAD)
458 mount_set_state(mount, MOUNT_MOUNTED);
459 else if (!mount->still_exists && mount->state == MOUNT_MOUNTED) {
460 mount_set_state(mount, MOUNT_DEAD);
461 mount->from_proc_self_mountinfo = false;
464 /* Clear the flags for later calls */
465 mount->just_created = false;
466 mount->still_exists = false;
470 const UnitVTable mount_vtable = {
473 .init = unit_load_fragment_and_dropin,
475 .coldplug = mount_coldplug,
479 .active_state = mount_active_state,
481 .enumerate = mount_enumerate,
482 .shutdown = mount_shutdown