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701cc384c2
systemd-stable/mount.c
Lennart Poettering 701cc384c2 manager: automatically GC unreferenced units
2010-04-21 06:01:13 +02:00

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/*-*- 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 <signal.h>
#include "unit.h"
#include "mount.h"
#include "load-fragment.h"
#include "load-dropin.h"
#include "log.h"
#include "strv.h"
#include "mount-setup.h"
#include "unit-name.h"
#include "mount.h"
#include "dbus-mount.h"
static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
[MOUNT_DEAD] = UNIT_INACTIVE,
[MOUNT_MOUNTING] = UNIT_ACTIVATING,
[MOUNT_MOUNTING_DONE] = UNIT_ACTIVE,
[MOUNT_MOUNTED] = UNIT_ACTIVE,
[MOUNT_REMOUNTING] = UNIT_ACTIVE_RELOADING,
[MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
[MOUNT_MOUNTING_SIGTERM] = UNIT_DEACTIVATING,
[MOUNT_MOUNTING_SIGKILL] = UNIT_DEACTIVATING,
[MOUNT_REMOUNTING_SIGTERM] = UNIT_ACTIVE_RELOADING,
[MOUNT_REMOUNTING_SIGKILL] = UNIT_ACTIVE_RELOADING,
[MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
[MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
[MOUNT_MAINTAINANCE] = UNIT_INACTIVE,
};
static void mount_init(Unit *u) {
Mount *m = MOUNT(u);
assert(u);
assert(u->meta.load_state == UNIT_STUB);
m->timeout_usec = DEFAULT_TIMEOUT_USEC;
exec_context_init(&m->exec_context);
/* We need to make sure that /bin/mount is always called in
* the same process group as us, so that the autofs kernel
* side doesn't send us another mount request while we are
* already trying to comply its last one. */
m->exec_context.no_setsid = true;
m->timer_watch.type = WATCH_INVALID;
m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
}
static void mount_unwatch_control_pid(Mount *m) {
assert(m);
if (m->control_pid <= 0)
return;
unit_unwatch_pid(UNIT(m), m->control_pid);
m->control_pid = 0;
}
static void mount_parameters_done(MountParameters *p) {
assert(p);
free(p->what);
free(p->options);
free(p->fstype);
p->what = p->options = p->fstype = NULL;
}
static void mount_done(Unit *u) {
Mount *m = MOUNT(u);
assert(m);
free(m->where);
m->where = NULL;
mount_parameters_done(&m->parameters_etc_fstab);
mount_parameters_done(&m->parameters_proc_self_mountinfo);
mount_parameters_done(&m->parameters_fragment);
exec_context_done(&m->exec_context);
exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
m->control_command = NULL;
mount_unwatch_control_pid(m);
unit_unwatch_timer(u, &m->timer_watch);
}
static int mount_add_node_links(Mount *m) {
Unit *device;
char *e;
int r;
const char *what;
assert(m);
/* Adds in links to the device that this node is based on */
if (m->parameters_fragment.what)
what = m->parameters_fragment.what;
else if (m->parameters_etc_fstab.what)
what = m->parameters_etc_fstab.what;
else
/* We observe kernel mounts only while they are live,
* hence don't create any links for them */
return 0;
if (!path_startswith(what, "/dev/"))
return 0;
if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
return -ENOMEM;
r = manager_load_unit(UNIT(m)->meta.manager, e, NULL, &device);
free(e);
if (r < 0)
return r;
if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, device, true)) < 0)
return r;
if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, device, true)) < 0)
return r;
if (UNIT(m)->meta.manager->running_as == MANAGER_INIT ||
UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM)
if ((r = unit_add_dependency(device, UNIT_WANTS, UNIT(m), false)) < 0)
return r;
return 0;
}
static int mount_add_path_links(Mount *m) {
Meta *other;
int r;
assert(m);
/* 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 (m->meta.load_state != UNIT_LOADED)
continue;
if (path_startswith(m->where, n->where)) {
if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(other), true)) < 0)
return r;
if (n->from_etc_fstab || n->from_fragment)
if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(other), true)) < 0)
return r;
} else if (path_startswith(n->where, m->where)) {
if ((r = unit_add_dependency(UNIT(m), UNIT_BEFORE, UNIT(other), true)) < 0)
return r;
if (m->from_etc_fstab || m->from_fragment)
if ((r = unit_add_dependency(UNIT(other), UNIT_REQUIRES, UNIT(m), true)) < 0)
return r;
}
}
return 0;
}
static bool mount_test_option(const char *haystack, const char *needle) {
struct mntent me;
assert(needle);
/* Like glibc's hasmntopt(), but works on a string, not a
* struct mntent */
if (!haystack)
return false;
zero(me);
me.mnt_opts = (char*) haystack;
return !!hasmntopt(&me, needle);
}
static int mount_add_target_links(Mount *m) {
const char *target;
MountParameters *p;
Unit *tu;
int r;
bool noauto, handle, automount;
assert(m);
if (m->from_fragment)
p = &m->parameters_fragment;
else if (m->from_etc_fstab)
p = &m->parameters_etc_fstab;
else
return 0;
noauto = mount_test_option(p->options, MNTOPT_NOAUTO);
handle = mount_test_option(p->options, "comment=systemd.mount");
automount = mount_test_option(p->options, "comment=systemd.automount");
if (noauto && !handle && !automount)
return 0;
if (mount_test_option(p->options, "_netdev") ||
fstype_is_network(p->fstype))
target = SPECIAL_REMOTE_FS_TARGET;
else
target = SPECIAL_LOCAL_FS_TARGET;
if ((r = manager_load_unit(UNIT(m)->meta.manager, target, NULL, &tu)) < 0)
return r;
if (automount) {
Unit *am;
if ((r = unit_load_related_unit(UNIT(m), ".automount", &am)) < 0)
return r;
if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(am), true)) < 0)
return r;
return unit_add_dependency(UNIT(am), UNIT_BEFORE, tu, true);
} else {
if (handle)
if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true)) < 0)
return r;
return unit_add_dependency(UNIT(m), UNIT_BEFORE, tu, true);
}
}
static int mount_verify(Mount *m) {
bool b;
char *e;
assert(m);
if (UNIT(m)->meta.load_state != UNIT_LOADED)
return 0;
if (!(e = unit_name_from_path(m->where, ".mount")))
return -ENOMEM;
b = unit_has_name(UNIT(m), e);
free(e);
if (!b) {
log_error("%s's Where setting doesn't match unit name. Refusing.", UNIT(m)->meta.id);
return -EINVAL;
}
return 0;
}
static int mount_load(Unit *u) {
Mount *m = MOUNT(u);
int r;
assert(u);
assert(u->meta.load_state == UNIT_STUB);
if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
return r;
/* This is a new unit? Then let's add in some extras */
if (u->meta.load_state == UNIT_LOADED) {
if (!m->where)
if (!(m->where = unit_name_to_path(u->meta.id)))
return -ENOMEM;
path_kill_slashes(m->where);
/* Minor validity checking */
if ((m->parameters_fragment.options || m->parameters_fragment.fstype) && !m->parameters_fragment.what)
return -EBADMSG;
if (m->parameters_fragment.what)
m->from_fragment = true;
if ((r = mount_add_node_links(MOUNT(u))) < 0)
return r;
if ((r = mount_add_path_links(MOUNT(u))) < 0)
return r;
if ((r = mount_add_target_links(MOUNT(u))) < 0)
return r;
if ((r = unit_add_default_cgroup(u)) < 0)
return r;
}
return mount_verify(m);
}
static int mount_notify_automount(Mount *m, int status) {
Unit *p;
int r;
assert(m);
if ((r = unit_get_related_unit(UNIT(m), ".automount", &p)) < 0)
return r == -ENOENT ? 0 : r;
return automount_send_ready(AUTOMOUNT(p), status);
}
static void mount_set_state(Mount *m, MountState state) {
MountState old_state;
assert(m);
old_state = m->state;
m->state = state;
if (state != MOUNT_MOUNTING &&
state != MOUNT_MOUNTING_DONE &&
state != MOUNT_REMOUNTING &&
state != MOUNT_UNMOUNTING &&
state != MOUNT_MOUNTING_SIGTERM &&
state != MOUNT_MOUNTING_SIGKILL &&
state != MOUNT_UNMOUNTING_SIGTERM &&
state != MOUNT_UNMOUNTING_SIGKILL &&
state != MOUNT_REMOUNTING_SIGTERM &&
state != MOUNT_REMOUNTING_SIGKILL) {
unit_unwatch_timer(UNIT(m), &m->timer_watch);
mount_unwatch_control_pid(m);
m->control_command = NULL;
m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
}
if (state == MOUNT_MOUNTED ||
state == MOUNT_REMOUNTING)
mount_notify_automount(m, 0);
else if (state == MOUNT_DEAD ||
state == MOUNT_UNMOUNTING ||
state == MOUNT_MOUNTING_SIGTERM ||
state == MOUNT_MOUNTING_SIGKILL ||
state == MOUNT_REMOUNTING_SIGTERM ||
state == MOUNT_REMOUNTING_SIGKILL ||
state == MOUNT_UNMOUNTING_SIGTERM ||
state == MOUNT_UNMOUNTING_SIGKILL ||
state == MOUNT_MAINTAINANCE)
mount_notify_automount(m, -ENODEV);
if (state != old_state)
log_debug("%s changed %s → %s",
UNIT(m)->meta.id,
mount_state_to_string(old_state),
mount_state_to_string(state));
unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state]);
}
static int mount_coldplug(Unit *u) {
Mount *m = MOUNT(u);
MountState new_state = MOUNT_DEAD;
int r;
assert(m);
assert(m->state == MOUNT_DEAD);
if (m->deserialized_state != m->state)
new_state = m->deserialized_state;
else if (m->from_proc_self_mountinfo)
new_state = MOUNT_MOUNTED;
if (new_state != m->state) {
if (new_state == MOUNT_MOUNTING ||
new_state == MOUNT_MOUNTING_DONE ||
new_state == MOUNT_REMOUNTING ||
new_state == MOUNT_UNMOUNTING ||
new_state == MOUNT_MOUNTING_SIGTERM ||
new_state == MOUNT_MOUNTING_SIGKILL ||
new_state == MOUNT_UNMOUNTING_SIGTERM ||
new_state == MOUNT_UNMOUNTING_SIGKILL ||
new_state == MOUNT_REMOUNTING_SIGTERM ||
new_state == MOUNT_REMOUNTING_SIGKILL) {
if (m->control_pid <= 0)
return -EBADMSG;
if ((r = unit_watch_pid(UNIT(m), m->control_pid)) < 0)
return r;
if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
return r;
}
mount_set_state(m, new_state);
}
return 0;
}
static void mount_dump(Unit *u, FILE *f, const char *prefix) {
Mount *m = MOUNT(u);
MountParameters *p;
assert(m);
assert(f);
if (m->from_proc_self_mountinfo)
p = &m->parameters_proc_self_mountinfo;
else if (m->from_fragment)
p = &m->parameters_fragment;
else
p = &m->parameters_etc_fstab;
fprintf(f,
"%sMount State: %s\n"
"%sWhere: %s\n"
"%sWhat: %s\n"
"%sFile System Type: %s\n"
"%sOptions: %s\n"
"%sFrom /etc/fstab: %s\n"
"%sFrom /proc/self/mountinfo: %s\n"
"%sFrom fragment: %s\n"
"%sKillMode: %s\n",
prefix, mount_state_to_string(m->state),
prefix, m->where,
prefix, strna(p->what),
prefix, strna(p->fstype),
prefix, strna(p->options),
prefix, yes_no(m->from_etc_fstab),
prefix, yes_no(m->from_proc_self_mountinfo),
prefix, yes_no(m->from_fragment),
prefix, kill_mode_to_string(m->kill_mode));
if (m->control_pid > 0)
fprintf(f,
"%sControl PID: %llu\n",
prefix, (unsigned long long) m->control_pid);
exec_context_dump(&m->exec_context, f, prefix);
}
static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
pid_t pid;
int r;
assert(m);
assert(c);
assert(_pid);
if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
goto fail;
if ((r = exec_spawn(c,
NULL,
&m->exec_context,
NULL, 0,
true,
true,
UNIT(m)->meta.manager->confirm_spawn,
UNIT(m)->meta.cgroup_bondings,
&pid)) < 0)
goto fail;
if ((r = unit_watch_pid(UNIT(m), pid)) < 0)
/* FIXME: we need to do something here */
goto fail;
*_pid = pid;
return 0;
fail:
unit_unwatch_timer(UNIT(m), &m->timer_watch);
return r;
}
static void mount_enter_dead(Mount *m, bool success) {
assert(m);
if (!success)
m->failure = true;
mount_set_state(m, m->failure ? MOUNT_MAINTAINANCE : MOUNT_DEAD);
}
static void mount_enter_mounted(Mount *m, bool success) {
assert(m);
if (!success)
m->failure = true;
mount_set_state(m, MOUNT_MOUNTED);
}
static void mount_enter_signal(Mount *m, MountState state, bool success) {
int r;
bool sent = false;
assert(m);
if (!success)
m->failure = true;
if (m->kill_mode != KILL_NONE) {
int sig = (state == MOUNT_MOUNTING_SIGTERM ||
state == MOUNT_UNMOUNTING_SIGTERM ||
state == MOUNT_REMOUNTING_SIGTERM) ? SIGTERM : SIGKILL;
if (m->kill_mode == KILL_CONTROL_GROUP) {
if ((r = cgroup_bonding_kill_list(UNIT(m)->meta.cgroup_bondings, sig)) < 0) {
if (r != -EAGAIN && r != -ESRCH)
goto fail;
} else
sent = true;
}
if (!sent && m->control_pid > 0)
if (kill(m->kill_mode == KILL_PROCESS ? m->control_pid : -m->control_pid, sig) < 0 && errno != ESRCH) {
r = -errno;
goto fail;
}
}
if (sent) {
if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
goto fail;
mount_set_state(m, state);
} else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
mount_enter_mounted(m, true);
else
mount_enter_dead(m, true);
return;
fail:
log_warning("%s failed to kill processes: %s", UNIT(m)->meta.id, strerror(-r));
if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
mount_enter_mounted(m, false);
else
mount_enter_dead(m, false);
}
static void mount_enter_unmounting(Mount *m, bool success) {
int r;
assert(m);
if (!success)
m->failure = true;
m->control_command_id = MOUNT_EXEC_UNMOUNT;
m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
if ((r = exec_command_set(
m->control_command,
"/bin/umount",
m->where,
NULL)) < 0)
goto fail;
mount_unwatch_control_pid(m);
if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
goto fail;
mount_set_state(m, MOUNT_UNMOUNTING);
return;
fail:
log_warning("%s failed to run umount exectuable: %s", UNIT(m)->meta.id, strerror(-r));
mount_enter_mounted(m, false);
}
static void mount_enter_mounting(Mount *m) {
int r;
assert(m);
m->control_command_id = MOUNT_EXEC_MOUNT;
m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
if (m->from_fragment)
r = exec_command_set(
m->control_command,
"/bin/mount",
m->parameters_fragment.what,
m->where,
"-t", m->parameters_fragment.fstype,
m->parameters_fragment.options ? "-o" : NULL, m->parameters_fragment.options,
NULL);
else if (m->from_etc_fstab)
r = exec_command_set(
m->control_command,
"/bin/mount",
m->where,
NULL);
else
r = -ENOENT;
if (r < 0)
goto fail;
mount_unwatch_control_pid(m);
if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
goto fail;
mount_set_state(m, MOUNT_MOUNTING);
return;
fail:
log_warning("%s failed to run mount exectuable: %s", UNIT(m)->meta.id, strerror(-r));
mount_enter_dead(m, false);
}
static void mount_enter_mounting_done(Mount *m) {
assert(m);
mount_set_state(m, MOUNT_MOUNTING_DONE);
}
static void mount_enter_remounting(Mount *m, bool success) {
int r;
assert(m);
if (!success)
m->failure = true;
m->control_command_id = MOUNT_EXEC_REMOUNT;
m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
if (m->from_fragment) {
char *buf = NULL;
const char *o;
if (m->parameters_fragment.options) {
if (!(buf = strappend("remount,", m->parameters_fragment.options))) {
r = -ENOMEM;
goto fail;
}
o = buf;
} else
o = "remount";
r = exec_command_set(
m->control_command,
"/bin/mount",
m->parameters_fragment.what,
m->where,
"-t", m->parameters_fragment.fstype,
"-o", o,
NULL);
free(buf);
} else if (m->from_etc_fstab)
r = exec_command_set(
m->control_command,
"/bin/mount",
m->where,
"-o", "remount",
NULL);
else
r = -ENOENT;
if (r < 0) {
r = -ENOMEM;
goto fail;
}
mount_unwatch_control_pid(m);
if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
goto fail;
mount_set_state(m, MOUNT_REMOUNTING);
return;
fail:
mount_enter_mounted(m, false);
}
static int mount_start(Unit *u) {
Mount *m = MOUNT(u);
assert(m);
/* We cannot fulfill this request right now, try again later
* please! */
if (m->state == MOUNT_UNMOUNTING ||
m->state == MOUNT_UNMOUNTING_SIGTERM ||
m->state == MOUNT_UNMOUNTING_SIGKILL)
return -EAGAIN;
/* Already on it! */
if (m->state == MOUNT_MOUNTING ||
m->state == MOUNT_MOUNTING_SIGTERM ||
m->state == MOUNT_MOUNTING_SIGKILL)
return 0;
assert(m->state == MOUNT_DEAD || m->state == MOUNT_MAINTAINANCE);
m->failure = false;
mount_enter_mounting(m);
return 0;
}
static int mount_stop(Unit *u) {
Mount *m = MOUNT(u);
assert(m);
/* Cann't do this right now. */
if (m->state == MOUNT_MOUNTING ||
m->state == MOUNT_MOUNTING_DONE ||
m->state == MOUNT_MOUNTING_SIGTERM ||
m->state == MOUNT_MOUNTING_SIGKILL ||
m->state == MOUNT_REMOUNTING ||
m->state == MOUNT_REMOUNTING_SIGTERM ||
m->state == MOUNT_REMOUNTING_SIGKILL)
return -EAGAIN;
/* Already on it */
if (m->state == MOUNT_UNMOUNTING ||
m->state == MOUNT_UNMOUNTING_SIGKILL ||
m->state == MOUNT_UNMOUNTING_SIGTERM)
return 0;
assert(m->state == MOUNT_MOUNTED);
mount_enter_unmounting(m, true);
return 0;
}
static int mount_reload(Unit *u) {
Mount *m = MOUNT(u);
assert(m);
if (m->state == MOUNT_MOUNTING_DONE)
return -EAGAIN;
assert(m->state == MOUNT_MOUNTED);
mount_enter_remounting(m, true);
return 0;
}
static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
Mount *m = MOUNT(u);
assert(m);
assert(f);
assert(fds);
unit_serialize_item(u, f, "state", mount_state_to_string(m->state));
unit_serialize_item(u, f, "failure", yes_no(m->failure));
if (m->control_pid > 0)
unit_serialize_item_format(u, f, "control-pid", "%u", (unsigned) m->control_pid);
if (m->control_command_id >= 0)
unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id));
return 0;
}
static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
Mount *m = MOUNT(u);
int r;
assert(u);
assert(key);
assert(value);
assert(fds);
if (streq(key, "state")) {
MountState state;
if ((state = mount_state_from_string(value)) < 0)
log_debug("Failed to parse state value %s", value);
else
m->deserialized_state = state;
} else if (streq(key, "failure")) {
int b;
if ((b = parse_boolean(value)) < 0)
log_debug("Failed to parse failure value %s", value);
else
m->failure = b || m->failure;
} else if (streq(key, "control-pid")) {
unsigned pid;
if ((r = safe_atou(value, &pid)) < 0 || pid <= 0)
log_debug("Failed to parse control-pid value %s", value);
else
m->control_pid = (pid_t) pid;
} else if (streq(key, "control-command")) {
MountExecCommand id;
if ((id = mount_exec_command_from_string(value)) < 0)
log_debug("Failed to parse exec-command value %s", value);
else {
m->control_command_id = id;
m->control_command = m->exec_command + id;
}
} else
log_debug("Unknown serialization key '%s'", key);
return 0;
}
static UnitActiveState mount_active_state(Unit *u) {
assert(u);
return state_translation_table[MOUNT(u)->state];
}
static const char *mount_sub_state_to_string(Unit *u) {
assert(u);
return mount_state_to_string(MOUNT(u)->state);
}
static bool mount_check_gc(Unit *u) {
Mount *m = MOUNT(u);
assert(m);
return m->from_etc_fstab || m->from_proc_self_mountinfo;
}
static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
Mount *m = MOUNT(u);
bool success;
assert(m);
assert(pid >= 0);
success = code == CLD_EXITED && status == 0;
m->failure = m->failure || !success;
assert(m->control_pid == pid);
m->control_pid = 0;
if (m->control_command) {
exec_status_fill(&m->control_command->exec_status, pid, code, status);
m->control_command = NULL;
m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
}
log_debug("%s control process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
/* Note that mount(8) returning and the kernel sending us a
* mount table change event might happen out-of-order. If an
* operation succeed we assume the kernel will follow soon too
* and already change into the resulting state. If it fails
* we check if the kernel still knows about the mount. and
* change state accordingly. */
switch (m->state) {
case MOUNT_MOUNTING:
case MOUNT_MOUNTING_DONE:
case MOUNT_MOUNTING_SIGKILL:
case MOUNT_MOUNTING_SIGTERM:
case MOUNT_REMOUNTING:
case MOUNT_REMOUNTING_SIGKILL:
case MOUNT_REMOUNTING_SIGTERM:
if (success && m->from_proc_self_mountinfo)
mount_enter_mounted(m, true);
else if (m->from_proc_self_mountinfo)
mount_enter_mounted(m, false);
else
mount_enter_dead(m, false);
break;
case MOUNT_UNMOUNTING:
case MOUNT_UNMOUNTING_SIGKILL:
case MOUNT_UNMOUNTING_SIGTERM:
if (success)
mount_enter_dead(m, true);
else if (m->from_proc_self_mountinfo)
mount_enter_mounted(m, false);
else
mount_enter_dead(m, false);
break;
default:
assert_not_reached("Uh, control process died at wrong time.");
}
}
static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
Mount *m = MOUNT(u);
assert(m);
assert(elapsed == 1);
assert(w == &m->timer_watch);
switch (m->state) {
case MOUNT_MOUNTING:
case MOUNT_MOUNTING_DONE:
log_warning("%s mounting timed out. Stopping.", u->meta.id);
mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false);
break;
case MOUNT_REMOUNTING:
log_warning("%s remounting timed out. Stopping.", u->meta.id);
mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, false);
break;
case MOUNT_UNMOUNTING:
log_warning("%s unmounting timed out. Stopping.", u->meta.id);
mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false);
break;
case MOUNT_MOUNTING_SIGTERM:
log_warning("%s mounting timed out. Killing.", u->meta.id);
mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false);
break;
case MOUNT_REMOUNTING_SIGTERM:
log_warning("%s remounting timed out. Killing.", u->meta.id);
mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false);
break;
case MOUNT_UNMOUNTING_SIGTERM:
log_warning("%s unmounting timed out. Killing.", u->meta.id);
mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false);
break;
case MOUNT_MOUNTING_SIGKILL:
case MOUNT_REMOUNTING_SIGKILL:
case MOUNT_UNMOUNTING_SIGKILL:
log_warning("%s mount process still around after SIGKILL. Ignoring.", u->meta.id);
if (m->from_proc_self_mountinfo)
mount_enter_mounted(m, false);
else
mount_enter_dead(m, false);
break;
default:
assert_not_reached("Timeout at wrong time.");
}
}
static int mount_add_one(
Manager *m,
const char *what,
const char *where,
const char *options,
const char *fstype,
bool from_proc_self_mountinfo,
bool set_flags) {
int r;
Unit *u;
bool delete;
char *e, *w = NULL, *o = NULL, *f = NULL;
MountParameters *mp;
assert(m);
assert(what);
assert(where);
assert(options);
assert(fstype);
assert(!set_flags || from_proc_self_mountinfo);
/* Ignore API mount points. They should never be referenced in
* dependencies ever. */
if (mount_point_is_api(where))
return 0;
if (streq(fstype, "autofs"))
return 0;
/* probably some kind of swap, which we don't cover for now */
if (where[0] != '/')
return 0;
if (!(e = unit_name_from_path(where, ".mount")))
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)->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);
}
if (!(w = strdup(what)) ||
!(o = strdup(options)) ||
!(f = strdup(fstype))) {
r = -ENOMEM;
goto fail;
}
if (from_proc_self_mountinfo) {
mp = &MOUNT(u)->parameters_proc_self_mountinfo;
if (set_flags) {
MOUNT(u)->is_mounted = true;
MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
MOUNT(u)->just_changed = !streq_ptr(MOUNT(u)->parameters_proc_self_mountinfo.options, o);
}
MOUNT(u)->from_proc_self_mountinfo = true;
} else {
mp = &MOUNT(u)->parameters_etc_fstab;
MOUNT(u)->from_etc_fstab = true;
}
free(mp->what);
mp->what = w;
free(mp->options);
mp->options = o;
free(mp->fstype);
mp->fstype = f;
unit_add_to_dbus_queue(u);
return 0;
fail:
free(w);
free(o);
free(f);
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) {
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, me->mnt_opts, me->mnt_type, false, false);
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;
char *device, *path, *options, *fstype, *d, *p;
assert(m);
rewind(m->proc_self_mountinfo);
for (;;) {
int k;
device = path = options = fstype = d = p = NULL;
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 */
"%ms" /* (6) mount options */
"%*[^-]" /* (7) optional fields */
"- " /* (8) seperator */
"%ms " /* (9) file system type */
"%ms" /* (10) mount source */
"%*[^\n]", /* some rubbish at the end */
&path,
&options,
&fstype,
&device)) != 4) {
if (k == EOF)
break;
r = -EBADMSG;
goto finish;
}
if (!(d = cunescape(device)) ||
!(p = cunescape(path))) {
r = -ENOMEM;
goto finish;
}
if ((r = mount_add_one(m, d, p, options, fstype, true, set_flags)) < 0)
goto finish;
free(device);
free(path);
free(options);
free(fstype);
free(d);
free(p);
}
r = 0;
finish:
free(device);
free(path);
free(options);
free(fstype);
free(d);
free(p);
return r;
}
static void mount_shutdown(Manager *m) {
assert(m);
if (m->proc_self_mountinfo) {
fclose(m->proc_self_mountinfo);
m->proc_self_mountinfo = NULL;
}
}
static int mount_enumerate(Manager *m) {
int r;
struct epoll_event ev;
assert(m);
if (!m->proc_self_mountinfo) {
if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "re")))
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)) < 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));
/* Reset flags, just in case, for later calls */
LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
Mount *mount = (Mount*) meta;
mount->is_mounted = mount->just_mounted = mount->just_changed = false;
}
return;
}
manager_dispatch_load_queue(m);
LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
Mount *mount = (Mount*) meta;
if (!mount->is_mounted) {
/* This has just been unmounted. */
mount->from_proc_self_mountinfo = false;
switch (mount->state) {
case MOUNT_MOUNTED:
mount_enter_dead(mount, true);
break;
default:
mount_set_state(mount, mount->state);
break;
}
} else if (mount->just_mounted || mount->just_changed) {
/* New or changed entrymount */
switch (mount->state) {
case MOUNT_DEAD:
case MOUNT_MAINTAINANCE:
mount_enter_mounted(mount, true);
break;
case MOUNT_MOUNTING:
mount_enter_mounting_done(mount);
break;
default:
/* Nothing really changed, but let's
* issue an notification call
* nonetheless, in case somebody is
* waiting for this. (e.g. file system
* ro/rw remounts.) */
mount_set_state(mount, mount->state);
break;
}
}
/* Reset the flags for later calls */
mount->is_mounted = mount->just_mounted = mount->just_changed = false;
}
}
int mount_path_is_mounted(Manager *m, const char* path) {
char *t;
int r;
assert(m);
assert(path);
if (path[0] != '/')
return 1;
if (!(t = strdup(path)))
return -ENOMEM;
path_kill_slashes(t);
for (;;) {
char *e, *slash;
Unit *u;
if (!(e = unit_name_from_path(t, ".mount"))) {
r = -ENOMEM;
goto finish;
}
u = manager_get_unit(m, e);
free(e);
if (u &&
(MOUNT(u)->from_etc_fstab || MOUNT(u)->from_fragment) &&
MOUNT(u)->state != MOUNT_MOUNTED) {
r = 0;
goto finish;
}
assert_se(slash = strrchr(t, '/'));
if (slash == t) {
r = 1;
goto finish;
}
*slash = 0;
}
r = 1;
finish:
free(t);
return r;
}
static const char* const mount_state_table[_MOUNT_STATE_MAX] = {
[MOUNT_DEAD] = "dead",
[MOUNT_MOUNTING] = "mounting",
[MOUNT_MOUNTING_DONE] = "mounting-done",
[MOUNT_MOUNTED] = "mounted",
[MOUNT_REMOUNTING] = "remounting",
[MOUNT_UNMOUNTING] = "unmounting",
[MOUNT_MOUNTING_SIGTERM] = "mounting-sigterm",
[MOUNT_MOUNTING_SIGKILL] = "mounting-sigkill",
[MOUNT_REMOUNTING_SIGTERM] = "remounting-sigterm",
[MOUNT_REMOUNTING_SIGKILL] = "remounting-sigkill",
[MOUNT_UNMOUNTING_SIGTERM] = "unmounting-sigterm",
[MOUNT_UNMOUNTING_SIGKILL] = "unmounting-sigkill",
[MOUNT_MAINTAINANCE] = "maintainance"
};
DEFINE_STRING_TABLE_LOOKUP(mount_state, MountState);
static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
[MOUNT_EXEC_MOUNT] = "ExecMount",
[MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
[MOUNT_EXEC_REMOUNT] = "ExecRemount",
};
DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
const UnitVTable mount_vtable = {
.suffix = ".mount",
.no_alias = true,
.no_instances = true,
.init = mount_init,
.load = mount_load,
.done = mount_done,
.coldplug = mount_coldplug,
.dump = mount_dump,
.start = mount_start,
.stop = mount_stop,
.reload = mount_reload,
.serialize = mount_serialize,
.deserialize_item = mount_deserialize_item,
.active_state = mount_active_state,
.sub_state_to_string = mount_sub_state_to_string,
.check_gc = mount_check_gc,
.sigchld_event = mount_sigchld_event,
.timer_event = mount_timer_event,
.bus_message_handler = bus_mount_message_handler,
.enumerate = mount_enumerate,
.shutdown = mount_shutdown
};
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