/*-*- Mode: C; c-basic-offset: 8 -*-*/
+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
#include <errno.h>
+#include <stdio.h>
+#include <mntent.h>
+#include <sys/epoll.h>
+#include <sys/poll.h>
#include "unit.h"
#include "mount.h"
#include "load-fragment.h"
-#include "load-fstab.h"
#include "load-dropin.h"
+#include "log.h"
-static int mount_init(Unit *u) {
- int r;
+static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
+ [MOUNT_DEAD] = UNIT_INACTIVE,
+ [MOUNT_MOUNTING] = UNIT_ACTIVATING,
+ [MOUNT_MOUNTED] = UNIT_ACTIVE,
+ [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
+ [MOUNT_MAINTAINANCE] = UNIT_INACTIVE,
+};
+
+static const char* const state_string_table[_MOUNT_STATE_MAX] = {
+ [MOUNT_DEAD] = "dead",
+ [MOUNT_MOUNTING] = "mounting",
+ [MOUNT_MOUNTED] = "mounted",
+ [MOUNT_UNMOUNTING] = "unmounting",
+ [MOUNT_MAINTAINANCE] = "maintainance"
+};
+
+static void mount_done(Unit *u) {
Mount *m = MOUNT(u);
assert(m);
+ free(m->what);
+ free(m->where);
+}
- /* Load a .mount file */
- if ((r = unit_load_fragment(u)) < 0 && errno != -ENOENT)
- return r;
+static void mount_set_state(Mount *m, MountState state) {
+ MountState old_state;
+ assert(m);
- /* Load entry from /etc/fstab */
- if ((r = unit_load_fstab(u)) < 0)
- return r;
+ if (state == m->state)
+ return;
- /* Load drop-in directory data */
- if ((r = unit_load_dropin(u)) < 0)
- return r;
+ old_state = m->state;
+ m->state = state;
- return r;
+ log_debug("%s changed %s → %s", unit_id(UNIT(m)), state_string_table[old_state], state_string_table[state]);
+
+ unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state]);
}
-static void mount_done(Unit *u) {
- Mount *d = MOUNT(u);
+static int mount_coldplug(Unit *u) {
+ Mount *m = MOUNT(u);
- assert(d);
- free(d->path);
-}
+ assert(m);
+ assert(m->state == MOUNT_DEAD);
-static void mount_dump(Unit *u, FILE *f, const char *prefix) {
+ if (m->from_proc_self_mountinfo)
+ mount_set_state(m, MOUNT_MOUNTED);
- static const char* const state_table[_MOUNT_STATE_MAX] = {
- [MOUNT_DEAD] = "dead",
- [MOUNT_MOUNTING] = "mounting",
- [MOUNT_MOUNTED] = "mounted",
- [MOUNT_UNMOUNTING] = "unmounting",
- [MOUNT_MAINTAINANCE] = "maintainance"
- };
+ return 0;
+}
+static void mount_dump(Unit *u, FILE *f, const char *prefix) {
Mount *s = MOUNT(u);
assert(s);
fprintf(f,
"%sMount State: %s\n"
- "%sPath: %s\n",
- prefix, state_table[s->state],
- prefix, s->path);
+ "%sWhere: %s\n"
+ "%sWhat: %s\n"
+ "%sFrom /etc/fstab: %s\n"
+ "%sFrom /proc/self/mountinfo: %s\n",
+ prefix, state_string_table[s->state],
+ prefix, s->where,
+ prefix, s->what,
+ prefix, yes_no(s->from_etc_fstab),
+ prefix, yes_no(s->from_proc_self_mountinfo));
}
static UnitActiveState mount_active_state(Unit *u) {
+ assert(u);
+
+ return state_translation_table[MOUNT(u)->state];
+}
+
+static void mount_shutdown(Manager *m) {
+ assert(m);
+
+ if (m->proc_self_mountinfo)
+ fclose(m->proc_self_mountinfo);
+}
+
+static int mount_add_node_links(Mount *m) {
+ Unit *device;
+ char *e;
+ int r;
+
+ assert(m);
+
+ /* Adds in links to the device that this node is based on */
+
+ if (!path_startswith(m->what, "/dev/"))
+ return 0;
+
+ if (!(e = unit_name_escape_path(m->what+1, ".device")))
+ return -ENOMEM;
+
+ r = manager_load_unit(UNIT(m)->meta.manager, e, &device);
+ free(e);
+
+ if (r < 0)
+ return r;
+
+ if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, device)) < 0)
+ return r;
+
+ if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, device)) < 0)
+ return r;
+
+ if ((r = unit_add_dependency(device, UNIT_WANTS, UNIT(m))) < 0)
+ return r;
+
+ return 0;
+}
+
+static int mount_add_path_links(Mount *m) {
+ Meta *other;
+ int r;
+
+ /* Adds in link to other mount points, that might lie below or
+ * above us in the hierarchy */
+
+ LIST_FOREACH(units_per_type, other, UNIT(m)->meta.manager->units_per_type[UNIT_MOUNT]) {
+ Mount *n;
+
+ n = (Mount*) other;
+
+ if (n == m)
+ continue;
+
+ if (path_startswith(m->where, n->where)) {
+
+ if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, (Unit*) other)) < 0)
+ return r;
+
+ if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, (Unit*) other)) < 0)
+ return r;
+
+ } else if (startswith(n->where, m->where)) {
+
+ if ((r = unit_add_dependency(UNIT(m), UNIT_BEFORE, (Unit*) other)) < 0)
+ return r;
+
+ if ((r = unit_add_dependency((Unit*) other, UNIT_REQUIRES, UNIT(m))) < 0)
+ return r;
+ }
+ }
+
+ return 0;
+}
+
+static int mount_add_one(Manager *m, const char *what, const char *where, bool live, bool set_flags) {
+ char *e;
+ int r;
+ Unit *u;
+ bool delete;
+
+ assert(m);
+ assert(what);
+ assert(where);
+
+ /* probably some kind of swap, which we don't cover for now */
+ if (where[0] != '/')
+ return 0;
+
+ if (streq(where, "/"))
+ e = strdup("-.mount");
+ else
+ e = unit_name_escape_path(where+1, ".mount");
+
+ if (!e)
+ return -ENOMEM;
+
+ if (!(u = manager_get_unit(m, e))) {
+ delete = true;
+
+ if (!(u = unit_new(m))) {
+ free(e);
+ return -ENOMEM;
+ }
+
+ r = unit_add_name(u, e);
+ free(e);
+
+ if (r < 0)
+ goto fail;
+
+ if (!(MOUNT(u)->what = strdup(what)) ||
+ !(MOUNT(u)->where = strdup(where))) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ if ((r = unit_set_description(u, where)) < 0)
+ goto fail;
+
+ unit_add_to_load_queue(u);
+ } else {
+ delete = false;
+ free(e);
+ }
- static const UnitActiveState table[_MOUNT_STATE_MAX] = {
- [MOUNT_DEAD] = UNIT_INACTIVE,
- [MOUNT_MOUNTING] = UNIT_ACTIVATING,
- [MOUNT_MOUNTED] = UNIT_ACTIVE,
- [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
- [MOUNT_MAINTAINANCE] = UNIT_INACTIVE,
- };
+ if (set_flags)
+ MOUNT(u)->still_exists = true;
- return table[MOUNT(u)->state];
+ if (live) {
+ if (set_flags)
+ MOUNT(u)->just_created = !MOUNT(u)->from_proc_self_mountinfo;
+ MOUNT(u)->from_proc_self_mountinfo = true;
+ } else {
+ if (set_flags)
+ MOUNT(u)->just_created = !MOUNT(u)->from_etc_fstab;
+ MOUNT(u)->from_etc_fstab = true;
+ }
+
+ if ((r = mount_add_node_links(MOUNT(u))) < 0)
+ goto fail;
+
+ if ((r = mount_add_path_links(MOUNT(u))) < 0)
+ goto fail;
+
+ unit_add_to_dbus_queue(u);
+
+ return 0;
+
+fail:
+ if (delete && u)
+ unit_free(u);
+
+ return 0;
+}
+
+static char *fstab_node_to_udev_node(char *p) {
+ char *dn, *t;
+ int r;
+
+ /* FIXME: to follow udev's logic 100% we need to leave valid
+ * UTF8 chars unescaped */
+
+ if (startswith(p, "LABEL=")) {
+
+ if (!(t = xescape(p+6, "/ ")))
+ return NULL;
+
+ r = asprintf(&dn, "/dev/disk/by-label/%s", t);
+ free(t);
+
+ if (r < 0)
+ return NULL;
+
+ return dn;
+ }
+
+ if (startswith(p, "UUID=")) {
+
+ if (!(t = xescape(p+5, "/ ")))
+ return NULL;
+
+ r = asprintf(&dn, "/dev/disk/by-uuid/%s", ascii_strlower(t));
+ free(t);
+
+ if (r < 0)
+ return NULL;
+
+ return dn;
+ }
+
+ return strdup(p);
+}
+
+static int mount_load_etc_fstab(Manager *m, bool set_flags) {
+ FILE *f;
+ int r;
+ struct mntent* me;
+
+ assert(m);
+
+ errno = 0;
+ if (!(f = setmntent("/etc/fstab", "r")))
+ return -errno;
+
+ while ((me = getmntent(f))) {
+ char *where, *what;
+
+ if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ if (!(where = strdup(me->mnt_dir))) {
+ free(what);
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ if (what[0] == '/')
+ path_kill_slashes(what);
+
+ if (where[0] == '/')
+ path_kill_slashes(where);
+
+ r = mount_add_one(m, what, where, false, set_flags);
+ free(what);
+ free(where);
+
+ if (r < 0)
+ goto finish;
+ }
+
+ r = 0;
+finish:
+
+ endmntent(f);
+ return r;
+}
+
+static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
+ int r;
+
+ assert(m);
+
+ rewind(m->proc_self_mountinfo);
+
+ for (;;) {
+ int k;
+ char *device, *path, *d, *p;
+
+ if ((k = fscanf(m->proc_self_mountinfo,
+ "%*s " /* (1) mount id */
+ "%*s " /* (2) parent id */
+ "%*s " /* (3) major:minor */
+ "%*s " /* (4) root */
+ "%ms " /* (5) mount point */
+ "%*s" /* (6) mount options */
+ "%*[^-]" /* (7) optional fields */
+ "- " /* (8) seperator */
+ "%*s " /* (9) file system type */
+ "%ms" /* (10) mount source */
+ "%*[^\n]", /* some rubbish at the end */
+ &path,
+ &device)) != 2) {
+
+ if (k == EOF)
+ break;
+
+ return -EBADMSG;
+ }
+
+ if (!(d = cunescape(device))) {
+ free(device);
+ free(path);
+ return -ENOMEM;
+ }
+ free(device);
+
+ if (!(p = cunescape(path))) {
+ free(d);
+ free(path);
+ return -ENOMEM;
+ }
+ free(path);
+
+ r = mount_add_one(m, d, p, true, set_flags);
+ free(d);
+ free(p);
+
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+static int mount_enumerate(Manager *m) {
+ int r;
+ struct epoll_event ev;
+ assert(m);
+
+ if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "r")))
+ return -errno;
+
+ m->mount_watch.type = WATCH_MOUNT;
+ m->mount_watch.fd = fileno(m->proc_self_mountinfo);
+
+ zero(ev);
+ ev.events = EPOLLERR;
+ ev.data.ptr = &m->mount_watch;
+
+ if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
+ return -errno;
+
+ if ((r = mount_load_etc_fstab(m, false)) < 0)
+ goto fail;
+
+ if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
+ goto fail;
+
+ return 0;
+
+fail:
+ mount_shutdown(m);
+ return r;
+}
+
+void mount_fd_event(Manager *m, int events) {
+ Meta *meta;
+ int r;
+
+ assert(m);
+ assert(events == EPOLLERR);
+
+ /* The manager calls this for every fd event happening on the
+ * /proc/self/mountinfo file, which informs us about mounting
+ * table changes */
+
+ if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
+ log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-errno));
+ return;
+ }
+
+ manager_dispatch_load_queue(m);
+
+ LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
+ Mount *mount = (Mount*) meta;
+
+ if (mount->just_created && mount->state == MOUNT_DEAD)
+ mount_set_state(mount, MOUNT_MOUNTED);
+ else if (!mount->still_exists && mount->state == MOUNT_MOUNTED) {
+ mount_set_state(mount, MOUNT_DEAD);
+ mount->from_proc_self_mountinfo = false;
+ }
+
+ /* Clear the flags for later calls */
+ mount->just_created = false;
+ mount->still_exists = false;
+ }
}
const UnitVTable mount_vtable = {
.suffix = ".mount",
- .init = mount_init,
+ .init = unit_load_fragment_and_dropin,
.done = mount_done,
+ .coldplug = mount_coldplug,
.dump = mount_dump,
.active_state = mount_active_state,
+
+ .enumerate = mount_enumerate,
+ .shutdown = mount_shutdown
};