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systemd/src/mount.c

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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
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 "dbus-mount.h"
#include "special.h"
#include "bus-errors.h"
#include "exit-status.h"
#include "def.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_RELOADING,
[MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
[MOUNT_MOUNTING_SIGTERM] = UNIT_DEACTIVATING,
[MOUNT_MOUNTING_SIGKILL] = UNIT_DEACTIVATING,
[MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING,
[MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING,
[MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
[MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
[MOUNT_FAILED] = UNIT_FAILED
};
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;
m->directory_mode = 0755;
exec_context_init(&m->exec_context);
/* The stdio/kmsg bridge socket is on /, in order to avoid a
* dep loop, don't use kmsg logging for -.mount */
if (!unit_has_name(u, "-.mount"))
m->exec_context.std_output = EXEC_OUTPUT_KMSG;
/* 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.same_pgrp = true;
m->timer_watch.type = WATCH_INVALID;
m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
m->meta.ignore_on_isolate = true;
}
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);
Meta *other;
assert(m);
free(m->where);
m->where = NULL;
/* Try to detach us from the automount unit if there is any */
LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_AUTOMOUNT]) {
Automount *a = (Automount*) other;
if (a->mount == m)
a->mount = 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 MountParameters* get_mount_parameters_configured(Mount *m) {
assert(m);
if (m->from_fragment)
return &m->parameters_fragment;
else if (m->from_etc_fstab)
return &m->parameters_etc_fstab;
return NULL;
}
static MountParameters* get_mount_parameters(Mount *m) {
assert(m);
if (m->from_proc_self_mountinfo)
return &m->parameters_proc_self_mountinfo;
return get_mount_parameters_configured(m);
}
static int mount_add_mount_links(Mount *m) {
Meta *other;
int r;
MountParameters *pm;
assert(m);
pm = get_mount_parameters_configured(m);
/* Adds in links to other mount points that might lie below or
* above us in the hierarchy */
LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_MOUNT]) {
Mount *n = (Mount*) other;
MountParameters *pn;
if (n == m)
continue;
if (n->meta.load_state != UNIT_LOADED)
continue;
pn = get_mount_parameters_configured(n);
if (path_startswith(m->where, n->where)) {
if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
return r;
if (pn)
if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
return r;
} else if (path_startswith(n->where, m->where)) {
if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
return r;
if (pm)
if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
return r;
} else if (pm && path_startswith(pm->what, n->where)) {
if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
return r;
if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
return r;
} else if (pn && path_startswith(pn->what, m->where)) {
if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
return r;
if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
return r;
}
}
return 0;
}
static int mount_add_swap_links(Mount *m) {
Meta *other;
int r;
assert(m);
LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_SWAP])
if ((r = swap_add_one_mount_link((Swap*) other, m)) < 0)
return r;
return 0;
}
static int mount_add_path_links(Mount *m) {
Meta *other;
int r;
assert(m);
LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_PATH])
if ((r = path_add_one_mount_link((Path*) other, m)) < 0)
return r;
return 0;
}
static int mount_add_automount_links(Mount *m) {
Meta *other;
int r;
assert(m);
LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_AUTOMOUNT])
if ((r = automount_add_one_mount_link((Automount*) other, m)) < 0)
return r;
return 0;
}
static int mount_add_socket_links(Mount *m) {
Meta *other;
int r;
assert(m);
LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_SOCKET])
if ((r = socket_add_one_mount_link((Socket*) other, m)) < 0)
return r;
return 0;
}
static char* 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 bool mount_is_network(MountParameters *p) {
assert(p);
if (mount_test_option(p->options, "_netdev"))
return true;
if (p->fstype && fstype_is_network(p->fstype))
return true;
return false;
}
static bool mount_is_bind(MountParameters *p) {
assert(p);
if (mount_test_option(p->options, "bind"))
return true;
if (p->fstype && streq(p->fstype, "bind"))
return true;
return false;
}
static bool needs_quota(MountParameters *p) {
assert(p);
if (mount_is_network(p))
return false;
if (mount_is_bind(p))
return false;
return mount_test_option(p->options, "usrquota") ||
mount_test_option(p->options, "grpquota");
}
static int mount_add_target_links(Mount *m) {
const char *target, *after = NULL;
MountParameters *p;
Unit *tu;
int r;
bool noauto, nofail, handle, automount;
assert(m);
if (!(p = get_mount_parameters_configured(m)))
return 0;
noauto = !!mount_test_option(p->options, MNTOPT_NOAUTO);
nofail = !!mount_test_option(p->options, "nofail");
handle =
mount_test_option(p->options, "comment=systemd.mount") ||
mount_test_option(p->options, "x-systemd-mount") ||
m->meta.manager->mount_auto;
automount =
mount_test_option(p->options, "comment=systemd.automount") ||
mount_test_option(p->options, "x-systemd-automount");
if (mount_is_network(p)) {
target = SPECIAL_REMOTE_FS_TARGET;
if (m->meta.manager->running_as == MANAGER_SYSTEM)
after = SPECIAL_NETWORK_TARGET;
} else
target = SPECIAL_LOCAL_FS_TARGET;
if ((r = manager_load_unit(m->meta.manager, target, NULL, NULL, &tu)) < 0)
return r;
if (after)
if ((r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, NULL, true)) < 0)
return r;
if (automount && m->meta.manager->running_as == MANAGER_SYSTEM) {
Unit *am;
if ((r = unit_load_related_unit(UNIT(m), ".automount", &am)) < 0)
return r;
return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_WANTS, UNIT(am), true);
} else {
/* Automatically add mount points that aren't natively
* configured to local-fs.target */
if (!noauto &&
!nofail &&
handle &&
m->from_etc_fstab &&
m->meta.manager->running_as == MANAGER_SYSTEM)
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_add_device_links(Mount *m) {
MountParameters *p;
int r;
assert(m);
if (!(p = get_mount_parameters_configured(m)))
return 0;
if (!p->what)
return 0;
if (!mount_is_bind(p) && !path_equal(m->where, "/")) {
bool nofail, noauto;
noauto = !!mount_test_option(p->options, MNTOPT_NOAUTO);
nofail = !!mount_test_option(p->options, "nofail");
if ((r = unit_add_node_link(UNIT(m), p->what,
!noauto && nofail &&
UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM)) < 0)
return r;
}
if (p->passno > 0 &&
!mount_is_bind(p) &&
UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM &&
!path_equal(m->where, "/")) {
char *name;
Unit *fsck;
/* Let's add in the fsck service */
/* aka SPECIAL_FSCK_SERVICE */
if (!(name = unit_name_from_path_instance("fsck", p->what, ".service")))
return -ENOMEM;
if ((r = manager_load_unit_prepare(m->meta.manager, name, NULL, NULL, &fsck)) < 0) {
log_warning("Failed to prepare unit %s: %s", name, strerror(-r));
free(name);
return r;
}
free(name);
SERVICE(fsck)->fsck_passno = p->passno;
if ((r = unit_add_two_dependencies(UNIT(m), UNIT_AFTER, UNIT_REQUIRES, fsck, true)) < 0)
return r;
}
return 0;
}
static int mount_add_default_dependencies(Mount *m) {
int r;
assert(m);
if (m->meta.manager->running_as == MANAGER_SYSTEM &&
!path_equal(m->where, "/")) {
MountParameters *p;
p = get_mount_parameters_configured(m);
if (p && needs_quota(p)) {
if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, NULL, true)) < 0 ||
(r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, NULL, true)) < 0)
return r;
}
if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
return r;
}
return 0;
}
static int mount_fix_timeouts(Mount *m) {
MountParameters *p;
const char *timeout = NULL;
Unit *other;
Iterator i;
usec_t u;
char *t;
int r;
assert(m);
if (!(p = get_mount_parameters_configured(m)))
return 0;
/* Allow configuration how long we wait for a device that
* backs a mount point to show up. This is useful to support
* endless device timeouts for devices that show up only after
* user input, like crypto devices. */
if ((timeout = mount_test_option(p->options, "comment=systemd.device-timeout")))
timeout += 31;
else if ((timeout = mount_test_option(p->options, "x-systemd-device-timeout")))
timeout += 25;
else
return 0;
t = strndup(timeout, strcspn(timeout, ",;" WHITESPACE));
if (!t)
return -ENOMEM;
r = parse_usec(t, &u);
free(t);
if (r < 0) {
log_warning("Failed to parse timeout for %s, ignoring: %s", m->where, timeout);
return r;
}
SET_FOREACH(other, m->meta.dependencies[UNIT_AFTER], i) {
if (other->meta.type != UNIT_DEVICE)
continue;
other->meta.job_timeout = u;
}
return 0;
}
static int mount_verify(Mount *m) {
bool b;
char *e;
assert(m);
if (m->meta.load_state != UNIT_LOADED)
return 0;
if (!m->from_etc_fstab && !m->from_fragment && !m->from_proc_self_mountinfo)
return -ENOENT;
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.", m->meta.id);
return -EINVAL;
}
if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
log_error("Cannot create mount unit for API file system %s. Refusing.", m->where);
return -EINVAL;
}
if (m->meta.fragment_path && !m->parameters_fragment.what) {
log_error("%s's What setting is missing. Refusing.", m->meta.id);
return -EBADMSG;
}
if (m->exec_context.pam_name && m->exec_context.kill_mode != KILL_CONTROL_GROUP) {
log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", 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 ((r = unit_add_exec_dependencies(u, &m->exec_context)) < 0)
return r;
if (m->meta.fragment_path)
m->from_fragment = true;
if (!m->where)
if (!(m->where = unit_name_to_path(u->meta.id)))
return -ENOMEM;
path_kill_slashes(m->where);
if (!m->meta.description)
if ((r = unit_set_description(u, m->where)) < 0)
return r;
if ((r = mount_add_device_links(m)) < 0)
return r;
if ((r = mount_add_mount_links(m)) < 0)
return r;
if ((r = mount_add_socket_links(m)) < 0)
return r;
if ((r = mount_add_swap_links(m)) < 0)
return r;
if ((r = mount_add_path_links(m)) < 0)
return r;
if ((r = mount_add_automount_links(m)) < 0)
return r;
if ((r = mount_add_target_links(m)) < 0)
return r;
if ((r = unit_add_default_cgroups(u)) < 0)
return r;
if (m->meta.default_dependencies)
if ((r = mount_add_default_dependencies(m)) < 0)
return r;
mount_fix_timeouts(m);
}
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_FAILED)
mount_notify_automount(m, -ENODEV);
if (state != old_state)
log_debug("%s changed %s -> %s",
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], !m->reload_failure);
m->reload_failure = false;
}
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);
p = get_mount_parameters(m);
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"
"%sDirectoryMode: %04o\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, m->directory_mode);
if (m->control_pid > 0)
fprintf(f,
"%sControl PID: %lu\n",
prefix, (unsigned 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,
m->meta.manager->environment,
true,
true,
true,
m->meta.manager->confirm_spawn,
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_FAILED : 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;
Set *pid_set = NULL;
bool wait_for_exit = false;
assert(m);
if (!success)
m->failure = true;
if (m->exec_context.kill_mode != KILL_NONE) {
int sig = (state == MOUNT_MOUNTING_SIGTERM ||
state == MOUNT_UNMOUNTING_SIGTERM ||
state == MOUNT_REMOUNTING_SIGTERM) ? m->exec_context.kill_signal : SIGKILL;
if (m->control_pid > 0) {
if (kill_and_sigcont(m->control_pid, sig) < 0 && errno != ESRCH)
log_warning("Failed to kill control process %li: %m", (long) m->control_pid);
else
wait_for_exit = true;
}
if (m->exec_context.kill_mode == KILL_CONTROL_GROUP) {
if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
r = -ENOMEM;
goto fail;
}
/* Exclude the control pid from being killed via the cgroup */
if (m->control_pid > 0)
if ((r = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0)
goto fail;
if ((r = cgroup_bonding_kill_list(m->meta.cgroup_bondings, sig, true, pid_set)) < 0) {
if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
log_warning("Failed to kill control group: %s", strerror(-r));
} else if (r > 0)
wait_for_exit = true;
set_free(pid_set);
pid_set = NULL;
}
}
if (wait_for_exit) {
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", 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);
if (pid_set)
set_free(pid_set);
}
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' task: %s", m->meta.id, strerror(-r));
mount_enter_mounted(m, false);
}
static void mount_enter_mounting(Mount *m) {
int r;
MountParameters *p;
assert(m);
m->control_command_id = MOUNT_EXEC_MOUNT;
m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
mkdir_p(m->where, m->directory_mode);
/* Create the source directory for bind-mounts if needed */
p = get_mount_parameters_configured(m);
if (p && mount_is_bind(p))
mkdir_p(p->what, m->directory_mode);
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.fstype : "auto",
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' task: %s", 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 ? m->parameters_fragment.fstype : "auto",
"-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)
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:
log_warning("%s failed to run 'remount' task: %s", m->meta.id, strerror(-r));
m->reload_failure = true;
mount_enter_mounted(m, true);
}
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 ||
m->state == MOUNT_MOUNTING_SIGTERM ||
m->state == MOUNT_MOUNTING_SIGKILL)
return -EAGAIN;
/* Already on it! */
if (m->state == MOUNT_MOUNTING)
return 0;
assert(m->state == MOUNT_DEAD || m->state == MOUNT_FAILED);
m->failure = false;
mount_enter_mounting(m);
return 0;
}
static int mount_stop(Unit *u) {
Mount *m = MOUNT(u);
assert(m);
/* Already on it */
if (m->state == MOUNT_UNMOUNTING ||
m->state == MOUNT_UNMOUNTING_SIGKILL ||
m->state == MOUNT_UNMOUNTING_SIGTERM ||
m->state == MOUNT_MOUNTING_SIGTERM ||
m->state == MOUNT_MOUNTING_SIGKILL)
return 0;
assert(m->state == MOUNT_MOUNTING ||
m->state == MOUNT_MOUNTING_DONE ||
m->state == MOUNT_MOUNTED ||
m->state == MOUNT_REMOUNTING ||
m->state == MOUNT_REMOUNTING_SIGTERM ||
m->state == MOUNT_REMOUNTING_SIGKILL);
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", "%lu", (unsigned long) 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);
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")) {
pid_t pid;
if (parse_pid(value, &pid) < 0)
log_debug("Failed to parse control-pid value %s", value);
else
m->control_pid = 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);
if (pid != m->control_pid)
return;
m->control_pid = 0;
success = is_clean_exit(code, status);
m->failure = m->failure || !success;
if (m->control_command) {
exec_status_exit(&m->control_command->exec_status, pid, code, status, m->exec_context.utmp_id);
m->control_command = NULL;
m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
}
log_full(success ? LOG_DEBUG : LOG_NOTICE,
"%s mount 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:
if (success)
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_REMOUNTING:
case MOUNT_REMOUNTING_SIGKILL:
case MOUNT_REMOUNTING_SIGTERM:
m->reload_failure = !success;
if (m->from_proc_self_mountinfo)
mount_enter_mounted(m, true);
else
mount_enter_dead(m, true);
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.");
}
/* Notify clients about changed exit status */
unit_add_to_dbus_queue(u);
}
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);
m->reload_failure = true;
mount_enter_mounted(m, true);
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:
if (m->exec_context.send_sigkill) {
log_warning("%s mounting timed out. Killing.", u->meta.id);
mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false);
} else {
log_warning("%s mounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
if (m->from_proc_self_mountinfo)
mount_enter_mounted(m, false);
else
mount_enter_dead(m, false);
}
break;
case MOUNT_REMOUNTING_SIGTERM:
if (m->exec_context.send_sigkill) {
log_warning("%s remounting timed out. Killing.", u->meta.id);
mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false);
} else {
log_warning("%s remounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
if (m->from_proc_self_mountinfo)
mount_enter_mounted(m, false);
else
mount_enter_dead(m, false);
}
break;
case MOUNT_UNMOUNTING_SIGTERM:
if (m->exec_context.send_sigkill) {
log_warning("%s unmounting timed out. Killing.", u->meta.id);
mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false);
} else {
log_warning("%s unmounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
if (m->from_proc_self_mountinfo)
mount_enter_mounted(m, false);
else
mount_enter_dead(m, 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,
int passno,
bool from_proc_self_mountinfo,
bool set_flags) {
int r;
Unit *u;
bool delete;
char *e, *w = NULL, *o = NULL, *f = NULL;
MountParameters *p;
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) || mount_point_ignore(where))
return 0;
if (streq(fstype, "autofs"))
return 0;
/* probably some kind of swap, ignore */
if (!is_path(where))
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;
}
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) {
p = &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(p->options, o);
}
MOUNT(u)->from_proc_self_mountinfo = true;
} else {
p = &MOUNT(u)->parameters_etc_fstab;
MOUNT(u)->from_etc_fstab = true;
}
free(p->what);
p->what = w;
free(p->options);
p->options = o;
free(p->fstype);
p->fstype = f;
p->passno = passno;
unit_add_to_dbus_queue(u);
return 0;
fail:
free(w);
free(o);
free(f);
if (delete && u)
unit_free(u);
return r;
}
static int mount_find_pri(char *options) {
char *end, *pri;
unsigned long r;
if (!(pri = mount_test_option(options, "pri=")))
return 0;
pri += 4;
errno = 0;
r = strtoul(pri, &end, 10);
if (errno != 0)
return -errno;
if (end == pri || (*end != ',' && *end != 0))
return -EINVAL;
return (int) r;
}
static int mount_load_etc_fstab(Manager *m) {
FILE *f;
int r = 0;
struct mntent* me;
assert(m);
errno = 0;
if (!(f = setmntent("/etc/fstab", "r")))
return -errno;
while ((me = getmntent(f))) {
char *where, *what;
int k;
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);
if (streq(me->mnt_type, "swap")) {
int pri;
if ((pri = mount_find_pri(me->mnt_opts)) < 0)
k = pri;
else
k = swap_add_one(m,
what,
NULL,
pri,
!!mount_test_option(me->mnt_opts, MNTOPT_NOAUTO),
!!mount_test_option(me->mnt_opts, "nofail"),
!!mount_test_option(me->mnt_opts, "comment=systemd.swapon"),
false);
} else
k = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, me->mnt_passno, false, false);
free(what);
free(where);
if (r < 0)
r = k;
}
finish:
endmntent(f);
return r;
}
static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
int r = 0;
unsigned i;
char *device, *path, *options, *options2, *fstype, *d, *p, *o;
assert(m);
rewind(m->proc_self_mountinfo);
for (i = 1;; i++) {
int k;
device = path = options = options2 = fstype = d = p = o = 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) separator */
"%ms " /* (9) file system type */
"%ms" /* (10) mount source */
"%ms" /* (11) mount options 2 */
"%*[^\n]", /* some rubbish at the end */
&path,
&options,
&fstype,
&device,
&options2)) != 5) {
if (k == EOF)
break;
log_warning("Failed to parse /proc/self/mountinfo:%u.", i);
goto clean_up;
}
if (asprintf(&o, "%s,%s", options, options2) < 0) {
r = -ENOMEM;
goto finish;
}
if (!(d = cunescape(device)) ||
!(p = cunescape(path))) {
r = -ENOMEM;
goto finish;
}
if ((k = mount_add_one(m, d, p, o, fstype, 0, true, set_flags)) < 0)
r = k;
clean_up:
free(device);
free(path);
free(options);
free(options2);
free(fstype);
free(d);
free(p);
free(o);
}
finish:
free(device);
free(path);
free(options);
free(options2);
free(fstype);
free(d);
free(p);
free(o);
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 = EPOLLPRI;
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 & EPOLLPRI);
/* 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(-r));
/* 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 mount entry */
switch (mount->state) {
case MOUNT_DEAD:
case MOUNT_FAILED:
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;
}
}
static void mount_reset_failed(Unit *u) {
Mount *m = MOUNT(u);
assert(m);
if (m->state == MOUNT_FAILED)
mount_set_state(m, MOUNT_DEAD);
m->failure = false;
}
static int mount_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
Mount *m = MOUNT(u);
int r = 0;
Set *pid_set = NULL;
assert(m);
if (who == KILL_MAIN) {
dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Mount units have no main processes");
return -EINVAL;
}
if (m->control_pid <= 0 && who == KILL_CONTROL) {
dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
return -ENOENT;
}
if (m->control_pid > 0)
if (kill(m->control_pid, signo) < 0)
r = -errno;
if (mode == KILL_CONTROL_GROUP) {
int q;
if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
return -ENOMEM;
/* Exclude the control pid from being killed via the cgroup */
if (m->control_pid > 0)
if ((q = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0) {
r = q;
goto finish;
}
if ((q = cgroup_bonding_kill_list(m->meta.cgroup_bondings, signo, false, pid_set)) < 0)
if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
r = q;
}
finish:
if (pid_set)
set_free(pid_set);
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_FAILED] = "failed"
};
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,
.show_status = 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,
.kill = mount_kill,
.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,
.reset_failed = mount_reset_failed,
.bus_interface = "org.freedesktop.systemd1.Mount",
.bus_message_handler = bus_mount_message_handler,
.bus_invalidating_properties = bus_mount_invalidating_properties,
.enumerate = mount_enumerate,
.shutdown = mount_shutdown
};
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