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Systemd/src/core/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 Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <stdio.h>
#include <sys/epoll.h>
#include <signal.h>
#include <libmount.h>
#include <sys/inotify.h>
#include "manager.h"
#include "unit.h"
#include "mount.h"
#include "log.h"
#include "sd-messages.h"
#include "strv.h"
#include "mkdir.h"
#include "path-util.h"
#include "mount-setup.h"
#include "unit-name.h"
#include "dbus-mount.h"
#include "special.h"
#include "exit-status.h"
#include "fstab-util.h"
#include "formats-util.h"
#define RETRY_UMOUNT_MAX 32
DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_table*, mnt_free_table);
DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_iter*, mnt_free_iter);
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 int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
static bool mount_needs_network(const char *options, const char *fstype) {
if (fstab_test_option(options, "_netdev\0"))
return true;
if (fstype && fstype_is_network(fstype))
return true;
return false;
}
static bool mount_is_network(const MountParameters *p) {
assert(p);
return mount_needs_network(p->options, p->fstype);
}
static bool mount_is_bind(const MountParameters *p) {
assert(p);
if (fstab_test_option(p->options, "bind\0" "rbind\0"))
return true;
if (p->fstype && STR_IN_SET(p->fstype, "bind", "rbind"))
return true;
return false;
}
static bool mount_is_auto(const MountParameters *p) {
assert(p);
return !fstab_test_option(p->options, "noauto\0");
}
static bool needs_quota(const MountParameters *p) {
assert(p);
/* Quotas are not enabled on network filesystems,
* but we want them, for example, on storage connected via iscsi */
if (p->fstype && fstype_is_network(p->fstype))
return false;
if (mount_is_bind(p))
return false;
return fstab_test_option(p->options,
"usrquota\0" "grpquota\0" "quota\0" "usrjquota\0" "grpjquota\0");
}
static void mount_init(Unit *u) {
Mount *m = MOUNT(u);
assert(u);
assert(u->load_state == UNIT_STUB);
m->timeout_usec = u->manager->default_timeout_start_usec;
m->directory_mode = 0755;
if (unit_has_name(u, "-.mount")) {
/* Don't allow start/stop for root directory */
u->refuse_manual_start = true;
u->refuse_manual_stop = true;
} else {
/* The stdio/kmsg bridge socket is on /, in order to avoid a
* dep loop, don't use kmsg logging for -.mount */
m->exec_context.std_output = u->manager->default_std_output;
m->exec_context.std_error = u->manager->default_std_error;
}
/* We need to make sure that /usr/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->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
u->ignore_on_isolate = true;
}
static int mount_arm_timer(Mount *m) {
int r;
assert(m);
if (m->timeout_usec <= 0) {
m->timer_event_source = sd_event_source_unref(m->timer_event_source);
return 0;
}
if (m->timer_event_source) {
r = sd_event_source_set_time(m->timer_event_source, now(CLOCK_MONOTONIC) + m->timeout_usec);
if (r < 0)
return r;
return sd_event_source_set_enabled(m->timer_event_source, SD_EVENT_ONESHOT);
}
r = sd_event_add_time(
UNIT(m)->manager->event,
&m->timer_event_source,
CLOCK_MONOTONIC,
now(CLOCK_MONOTONIC) + m->timeout_usec, 0,
mount_dispatch_timer, m);
if (r < 0)
return r;
(void) sd_event_source_set_description(m->timer_event_source, "mount-timer");
return 0;
}
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);
m->where = mfree(m->where);
mount_parameters_done(&m->parameters_proc_self_mountinfo);
mount_parameters_done(&m->parameters_fragment);
m->exec_runtime = exec_runtime_unref(m->exec_runtime);
exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
m->control_command = NULL;
mount_unwatch_control_pid(m);
m->timer_event_source = sd_event_source_unref(m->timer_event_source);
}
_pure_ static MountParameters* get_mount_parameters_fragment(Mount *m) {
assert(m);
if (m->from_fragment)
return &m->parameters_fragment;
return NULL;
}
_pure_ 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_fragment(m);
}
static int mount_add_mount_links(Mount *m) {
_cleanup_free_ char *parent = NULL;
MountParameters *pm;
Unit *other;
Iterator i;
Set *s;
int r;
assert(m);
if (!path_equal(m->where, "/")) {
/* Adds in links to other mount points that might lie further
* up in the hierarchy */
r = path_get_parent(m->where, &parent);
if (r < 0)
return r;
r = unit_require_mounts_for(UNIT(m), parent);
if (r < 0)
return r;
}
/* Adds in links to other mount points that might be needed
* for the source path (if this is a bind mount) to be
* available. */
pm = get_mount_parameters_fragment(m);
if (pm && pm->what &&
path_is_absolute(pm->what) &&
!mount_is_network(pm)) {
r = unit_require_mounts_for(UNIT(m), pm->what);
if (r < 0)
return r;
}
/* Adds in links to other units that use this path or paths
* further down in the hierarchy */
s = manager_get_units_requiring_mounts_for(UNIT(m)->manager, m->where);
SET_FOREACH(other, s, i) {
if (other->load_state != UNIT_LOADED)
continue;
if (other == UNIT(m))
continue;
r = unit_add_dependency(other, UNIT_AFTER, UNIT(m), true);
if (r < 0)
return r;
if (UNIT(m)->fragment_path) {
/* If we have fragment configuration, then make this dependency required */
r = unit_add_dependency(other, UNIT_REQUIRES, UNIT(m), true);
if (r < 0)
return r;
}
}
return 0;
}
static int mount_add_device_links(Mount *m) {
MountParameters *p;
bool device_wants_mount = false;
int r;
assert(m);
p = get_mount_parameters(m);
if (!p)
return 0;
if (!p->what)
return 0;
if (mount_is_bind(p))
return 0;
if (!is_device_path(p->what))
return 0;
/* /dev/root is a really weird thing, it's not a real device,
* but just a path the kernel exports for the root file system
* specified on the kernel command line. Ignore it here. */
if (path_equal(p->what, "/dev/root"))
return 0;
if (path_equal(m->where, "/"))
return 0;
if (mount_is_auto(p) && UNIT(m)->manager->running_as == MANAGER_SYSTEM)
device_wants_mount = true;
r = unit_add_node_link(UNIT(m), p->what, device_wants_mount);
if (r < 0)
return r;
return 0;
}
static int mount_add_quota_links(Mount *m) {
int r;
MountParameters *p;
assert(m);
if (UNIT(m)->manager->running_as != MANAGER_SYSTEM)
return 0;
p = get_mount_parameters_fragment(m);
if (!p)
return 0;
if (!needs_quota(p))
return 0;
r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, NULL, true);
if (r < 0)
return r;
r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, NULL, true);
if (r < 0)
return r;
return 0;
}
static bool should_umount(Mount *m) {
MountParameters *p;
if (path_equal(m->where, "/") ||
path_equal(m->where, "/usr"))
return false;
p = get_mount_parameters(m);
if (p && fstab_test_option(p->options, "x-initrd.mount\0") &&
!in_initrd())
return false;
return true;
}
static int mount_add_default_dependencies(Mount *m) {
const char *after, *after2, *online;
MountParameters *p;
int r;
assert(m);
if (UNIT(m)->manager->running_as != MANAGER_SYSTEM)
return 0;
/* We do not add any default dependencies to / and /usr, since
* they are guaranteed to stay mounted the whole time, since
* our system is on it. Also, don't bother with anything
* mounted below virtual file systems, it's also going to be
* virtual, and hence not worth the effort. */
if (path_equal(m->where, "/") ||
path_equal(m->where, "/usr") ||
path_startswith(m->where, "/proc") ||
path_startswith(m->where, "/sys") ||
path_startswith(m->where, "/dev"))
return 0;
p = get_mount_parameters(m);
if (!p)
return 0;
if (mount_is_network(p)) {
after = SPECIAL_REMOTE_FS_PRE_TARGET;
after2 = SPECIAL_NETWORK_TARGET;
online = SPECIAL_NETWORK_ONLINE_TARGET;
} else {
after = SPECIAL_LOCAL_FS_PRE_TARGET;
after2 = NULL;
online = NULL;
}
r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, NULL, true);
if (r < 0)
return r;
if (after2) {
r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after2, NULL, true);
if (r < 0)
return r;
}
if (online) {
r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_WANTS, UNIT_AFTER, online, NULL, true);
if (r < 0)
return r;
}
if (should_umount(m)) {
r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true);
if (r < 0)
return r;
}
return 0;
}
static int mount_verify(Mount *m) {
_cleanup_free_ char *e = NULL;
int r;
assert(m);
if (UNIT(m)->load_state != UNIT_LOADED)
return 0;
if (!m->from_fragment && !m->from_proc_self_mountinfo)
return -ENOENT;
r = unit_name_from_path(m->where, ".mount", &e);
if (r < 0)
return log_unit_error_errno(UNIT(m), r, "Failed to generate unit name from mount path: %m");
if (!unit_has_name(UNIT(m), e)) {
log_unit_error(UNIT(m), "Where= setting doesn't match unit name. Refusing.");
return -EINVAL;
}
if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
log_unit_error(UNIT(m), "Cannot create mount unit for API file system %s. Refusing.", m->where);
return -EINVAL;
}
if (UNIT(m)->fragment_path && !m->parameters_fragment.what) {
log_unit_error(UNIT(m), "What= setting is missing. Refusing.");
return -EBADMSG;
}
if (m->exec_context.pam_name && m->kill_context.kill_mode != KILL_CONTROL_GROUP) {
log_unit_error(UNIT(m), "Unit has PAM enabled. Kill mode must be set to control-group'. Refusing.");
return -EINVAL;
}
return 0;
}
static int mount_add_extras(Mount *m) {
Unit *u = UNIT(m);
int r;
assert(m);
if (u->fragment_path)
m->from_fragment = true;
if (!m->where) {
r = unit_name_to_path(u->id, &m->where);
if (r < 0)
return r;
}
path_kill_slashes(m->where);
if (!u->description) {
r = unit_set_description(u, m->where);
if (r < 0)
return r;
}
r = mount_add_device_links(m);
if (r < 0)
return r;
r = mount_add_mount_links(m);
if (r < 0)
return r;
r = mount_add_quota_links(m);
if (r < 0)
return r;
r = unit_patch_contexts(u);
if (r < 0)
return r;
r = unit_add_exec_dependencies(u, &m->exec_context);
if (r < 0)
return r;
r = unit_set_default_slice(u);
if (r < 0)
return r;
if (u->default_dependencies) {
r = mount_add_default_dependencies(m);
if (r < 0)
return r;
}
return 0;
}
static int mount_load(Unit *u) {
Mount *m = MOUNT(u);
int r;
assert(u);
assert(u->load_state == UNIT_STUB);
if (m->from_proc_self_mountinfo)
r = unit_load_fragment_and_dropin_optional(u);
else
r = unit_load_fragment_and_dropin(u);
if (r < 0)
return r;
/* This is a new unit? Then let's add in some extras */
if (u->load_state == UNIT_LOADED) {
r = mount_add_extras(m);
if (r < 0)
return r;
}
return mount_verify(m);
}
static int mount_notify_automount(Mount *m, MountState old_state, MountState state) {
Unit *p;
int r;
Iterator i;
assert(m);
SET_FOREACH(p, UNIT(m)->dependencies[UNIT_TRIGGERED_BY], i)
if (p->type == UNIT_AUTOMOUNT) {
r = automount_update_mount(AUTOMOUNT(p), old_state, state);
if (r < 0)
return r;
}
return 0;
}
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) {
m->timer_event_source = sd_event_source_unref(m->timer_event_source);
mount_unwatch_control_pid(m);
m->control_command = NULL;
m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
}
mount_notify_automount(m, old_state, state);
if (state != old_state)
log_unit_debug(UNIT(m), "Changed %s -> %s", 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_result == MOUNT_SUCCESS);
m->reload_result = MOUNT_SUCCESS;
}
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)
return 0;
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;
r = unit_watch_pid(UNIT(m), m->control_pid);
if (r < 0)
return r;
r = mount_arm_timer(m);
if (r < 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"
"%sResult: %s\n"
"%sWhere: %s\n"
"%sWhat: %s\n"
"%sFile System Type: %s\n"
"%sOptions: %s\n"
"%sFrom /proc/self/mountinfo: %s\n"
"%sFrom fragment: %s\n"
"%sDirectoryMode: %04o\n",
prefix, mount_state_to_string(m->state),
prefix, mount_result_to_string(m->result),
prefix, m->where,
prefix, p ? strna(p->what) : "n/a",
prefix, p ? strna(p->fstype) : "n/a",
prefix, p ? strna(p->options) : "n/a",
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: "PID_FMT"\n",
prefix, m->control_pid);
exec_context_dump(&m->exec_context, f, prefix);
kill_context_dump(&m->kill_context, f, prefix);
}
static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
pid_t pid;
int r;
ExecParameters exec_params = {
.apply_permissions = true,
.apply_chroot = true,
.apply_tty_stdin = true,
.bus_endpoint_fd = -1,
};
assert(m);
assert(c);
assert(_pid);
(void) unit_realize_cgroup(UNIT(m));
if (m->reset_cpu_usage) {
(void) unit_reset_cpu_usage(UNIT(m));
m->reset_cpu_usage = false;
}
r = unit_setup_exec_runtime(UNIT(m));
if (r < 0)
goto fail;
r = mount_arm_timer(m);
if (r < 0)
goto fail;
exec_params.environment = UNIT(m)->manager->environment;
exec_params.confirm_spawn = UNIT(m)->manager->confirm_spawn;
exec_params.cgroup_supported = UNIT(m)->manager->cgroup_supported;
exec_params.cgroup_path = UNIT(m)->cgroup_path;
exec_params.cgroup_delegate = m->cgroup_context.delegate;
exec_params.runtime_prefix = manager_get_runtime_prefix(UNIT(m)->manager);
r = exec_spawn(UNIT(m),
c,
&m->exec_context,
&exec_params,
m->exec_runtime,
&pid);
if (r < 0)
goto fail;
r = unit_watch_pid(UNIT(m), pid);
if (r < 0)
/* FIXME: we need to do something here */
goto fail;
*_pid = pid;
return 0;
fail:
m->timer_event_source = sd_event_source_unref(m->timer_event_source);
return r;
}
static void mount_enter_dead(Mount *m, MountResult f) {
assert(m);
if (f != MOUNT_SUCCESS)
m->result = f;
exec_runtime_destroy(m->exec_runtime);
m->exec_runtime = exec_runtime_unref(m->exec_runtime);
exec_context_destroy_runtime_directory(&m->exec_context, manager_get_runtime_prefix(UNIT(m)->manager));
mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD);
}
static void mount_enter_mounted(Mount *m, MountResult f) {
assert(m);
if (f != MOUNT_SUCCESS)
m->result = f;
mount_set_state(m, MOUNT_MOUNTED);
}
static void mount_enter_signal(Mount *m, MountState state, MountResult f) {
int r;
assert(m);
if (f != MOUNT_SUCCESS)
m->result = f;
r = unit_kill_context(
UNIT(m),
&m->kill_context,
(state != MOUNT_MOUNTING_SIGTERM && state != MOUNT_UNMOUNTING_SIGTERM && state != MOUNT_REMOUNTING_SIGTERM) ?
KILL_KILL : KILL_TERMINATE,
-1,
m->control_pid,
false);
if (r < 0)
goto fail;
if (r > 0) {
r = mount_arm_timer(m);
if (r < 0)
goto fail;
mount_set_state(m, state);
} else if (state == MOUNT_REMOUNTING_SIGTERM)
mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
else if (state == MOUNT_REMOUNTING_SIGKILL)
mount_enter_mounted(m, MOUNT_SUCCESS);
else if (state == MOUNT_MOUNTING_SIGTERM)
mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, MOUNT_SUCCESS);
else if (state == MOUNT_UNMOUNTING_SIGTERM)
mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS);
else
mount_enter_dead(m, MOUNT_SUCCESS);
return;
fail:
log_unit_warning_errno(UNIT(m), r, "Failed to kill processes: %m");
if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
mount_enter_mounted(m, MOUNT_FAILURE_RESOURCES);
else
mount_enter_dead(m, MOUNT_FAILURE_RESOURCES);
}
static void mount_enter_unmounting(Mount *m) {
int r;
assert(m);
/* Start counting our attempts */
if (!IN_SET(m->state,
MOUNT_UNMOUNTING,
MOUNT_UNMOUNTING_SIGTERM,
MOUNT_UNMOUNTING_SIGKILL))
m->n_retry_umount = 0;
m->control_command_id = MOUNT_EXEC_UNMOUNT;
m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
r = exec_command_set(m->control_command, UMOUNT_PATH, m->where, NULL);
if (r < 0)
goto fail;
mount_unwatch_control_pid(m);
r = mount_spawn(m, m->control_command, &m->control_pid);
if (r < 0)
goto fail;
mount_set_state(m, MOUNT_UNMOUNTING);
return;
fail:
log_unit_warning_errno(UNIT(m), r, "Failed to run 'umount' task: %m");
mount_enter_mounted(m, MOUNT_FAILURE_RESOURCES);
}
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;
r = unit_fail_if_symlink(UNIT(m), m->where);
if (r < 0)
goto fail;
(void) mkdir_p_label(m->where, m->directory_mode);
unit_warn_if_dir_nonempty(UNIT(m), m->where);
/* Create the source directory for bind-mounts if needed */
p = get_mount_parameters_fragment(m);
if (p && mount_is_bind(p))
(void) mkdir_p_label(p->what, m->directory_mode);
if (m->from_fragment) {
_cleanup_free_ char *opts = NULL;
r = fstab_filter_options(m->parameters_fragment.options,
"nofail\0" "noauto\0" "auto\0", NULL, NULL, &opts);
if (r < 0)
goto fail;
r = exec_command_set(m->control_command, MOUNT_PATH,
m->parameters_fragment.what, m->where, NULL);
if (r >= 0 && m->sloppy_options)
r = exec_command_append(m->control_command, "-s", NULL);
if (r >= 0 && m->parameters_fragment.fstype)
r = exec_command_append(m->control_command, "-t", m->parameters_fragment.fstype, NULL);
if (r >= 0 && !isempty(opts))
r = exec_command_append(m->control_command, "-o", opts, NULL);
} else
r = -ENOENT;
if (r < 0)
goto fail;
mount_unwatch_control_pid(m);
r = mount_spawn(m, m->control_command, &m->control_pid);
if (r < 0)
goto fail;
mount_set_state(m, MOUNT_MOUNTING);
return;
fail:
log_unit_warning_errno(UNIT(m), r, "Failed to run 'mount' task: %m");
mount_enter_dead(m, MOUNT_FAILURE_RESOURCES);
}
static void mount_enter_remounting(Mount *m) {
int r;
assert(m);
m->control_command_id = MOUNT_EXEC_REMOUNT;
m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
if (m->from_fragment) {
const char *o;
if (m->parameters_fragment.options)
o = strjoina("remount,", m->parameters_fragment.options);
else
o = "remount";
r = exec_command_set(m->control_command, MOUNT_PATH,
m->parameters_fragment.what, m->where,
"-o", o, NULL);
if (r >= 0 && m->sloppy_options)
r = exec_command_append(m->control_command, "-s", NULL);
if (r >= 0 && m->parameters_fragment.fstype)
r = exec_command_append(m->control_command, "-t", m->parameters_fragment.fstype, NULL);
} else
r = -ENOENT;
if (r < 0)
goto fail;
mount_unwatch_control_pid(m);
r = mount_spawn(m, m->control_command, &m->control_pid);
if (r < 0)
goto fail;
mount_set_state(m, MOUNT_REMOUNTING);
return;
fail:
log_unit_warning_errno(UNIT(m), r, "Failed to run 'remount' task: %m");
m->reload_result = MOUNT_FAILURE_RESOURCES;
mount_enter_mounted(m, MOUNT_SUCCESS);
}
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->result = MOUNT_SUCCESS;
m->reload_result = MOUNT_SUCCESS;
m->reset_cpu_usage = true;
mount_enter_mounting(m);
return 1;
}
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);
return 1;
}
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);
return 1;
}
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, "result", mount_result_to_string(m->result));
unit_serialize_item(u, f, "reload-result", mount_result_to_string(m->reload_result));
if (m->control_pid > 0)
unit_serialize_item_format(u, f, "control-pid", PID_FMT, 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_unit_debug(u, "Failed to parse state value: %s", value);
else
m->deserialized_state = state;
} else if (streq(key, "result")) {
MountResult f;
f = mount_result_from_string(value);
if (f < 0)
log_unit_debug(u, "Failed to parse result value: %s", value);
else if (f != MOUNT_SUCCESS)
m->result = f;
} else if (streq(key, "reload-result")) {
MountResult f;
f = mount_result_from_string(value);
if (f < 0)
log_unit_debug(u, "Failed to parse reload result value: %s", value);
else if (f != MOUNT_SUCCESS)
m->reload_result = f;
} else if (streq(key, "control-pid")) {
pid_t pid;
if (parse_pid(value, &pid) < 0)
log_unit_debug(u, "Failed to parse control-pid value: %s", value);
else
m->control_pid = pid;
} else if (streq(key, "control-command")) {
MountExecCommand id;
id = mount_exec_command_from_string(value);
if (id < 0)
log_unit_debug(u, "Failed to parse exec-command value: %s", value);
else {
m->control_command_id = id;
m->control_command = m->exec_command + id;
}
} else
log_unit_debug(u, "Unknown serialization key: %s", key);
return 0;
}
_pure_ static UnitActiveState mount_active_state(Unit *u) {
assert(u);
return state_translation_table[MOUNT(u)->state];
}
_pure_ static const char *mount_sub_state_to_string(Unit *u) {
assert(u);
return mount_state_to_string(MOUNT(u)->state);
}
_pure_ static bool mount_check_gc(Unit *u) {
Mount *m = MOUNT(u);
assert(m);
return m->from_proc_self_mountinfo;
}
static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
Mount *m = MOUNT(u);
MountResult f;
assert(m);
assert(pid >= 0);
if (pid != m->control_pid)
return;
m->control_pid = 0;
if (is_clean_exit(code, status, NULL))
f = MOUNT_SUCCESS;
else if (code == CLD_EXITED)
f = MOUNT_FAILURE_EXIT_CODE;
else if (code == CLD_KILLED)
f = MOUNT_FAILURE_SIGNAL;
else if (code == CLD_DUMPED)
f = MOUNT_FAILURE_CORE_DUMP;
else
assert_not_reached("Unknown code");
if (f != MOUNT_SUCCESS)
m->result = f;
if (m->control_command) {
exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status);
m->control_command = NULL;
m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
}
log_unit_full(u, f == MOUNT_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0,
"Mount process exited, code=%s status=%i", 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 (f == MOUNT_SUCCESS)
mount_enter_mounted(m, f);
else if (m->from_proc_self_mountinfo)
mount_enter_mounted(m, f);
else
mount_enter_dead(m, f);
break;
case MOUNT_REMOUNTING:
case MOUNT_REMOUNTING_SIGKILL:
case MOUNT_REMOUNTING_SIGTERM:
m->reload_result = f;
if (m->from_proc_self_mountinfo)
mount_enter_mounted(m, MOUNT_SUCCESS);
else
mount_enter_dead(m, MOUNT_SUCCESS);
break;
case MOUNT_UNMOUNTING:
case MOUNT_UNMOUNTING_SIGKILL:
case MOUNT_UNMOUNTING_SIGTERM:
if (f == MOUNT_SUCCESS) {
if (m->from_proc_self_mountinfo) {
/* Still a mount point? If so, let's
* try again. Most likely there were
* multiple mount points stacked on
* top of each other. Note that due to
* the io event priority logic we can
* be sure the new mountinfo is loaded
* before we process the SIGCHLD for
* the mount command. */
if (m->n_retry_umount < RETRY_UMOUNT_MAX) {
log_unit_debug(u, "Mount still present, trying again.");
m->n_retry_umount++;
mount_enter_unmounting(m);
} else {
log_unit_debug(u, "Mount still present after %u attempts to unmount, giving up.", m->n_retry_umount);
mount_enter_mounted(m, f);
}
} else
mount_enter_dead(m, f);
} else if (m->from_proc_self_mountinfo)
mount_enter_mounted(m, f);
else
mount_enter_dead(m, f);
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 int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
Mount *m = MOUNT(userdata);
assert(m);
assert(m->timer_event_source == source);
switch (m->state) {
case MOUNT_MOUNTING:
case MOUNT_MOUNTING_DONE:
log_unit_warning(UNIT(m), "Mounting timed out. Stopping.");
mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
break;
case MOUNT_REMOUNTING:
log_unit_warning(UNIT(m), "Remounting timed out. Stopping.");
m->reload_result = MOUNT_FAILURE_TIMEOUT;
mount_enter_mounted(m, MOUNT_SUCCESS);
break;
case MOUNT_UNMOUNTING:
log_unit_warning(UNIT(m), "Unmounting timed out. Stopping.");
mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
break;
case MOUNT_MOUNTING_SIGTERM:
if (m->kill_context.send_sigkill) {
log_unit_warning(UNIT(m), "Mounting timed out. Killing.");
mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
} else {
log_unit_warning(UNIT(m), "Mounting timed out. Skipping SIGKILL. Ignoring.");
if (m->from_proc_self_mountinfo)
mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
else
mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
}
break;
case MOUNT_REMOUNTING_SIGTERM:
if (m->kill_context.send_sigkill) {
log_unit_warning(UNIT(m), "Remounting timed out. Killing.");
mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
} else {
log_unit_warning(UNIT(m), "Remounting timed out. Skipping SIGKILL. Ignoring.");
if (m->from_proc_self_mountinfo)
mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
else
mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
}
break;
case MOUNT_UNMOUNTING_SIGTERM:
if (m->kill_context.send_sigkill) {
log_unit_warning(UNIT(m), "Unmounting timed out. Killing.");
mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
} else {
log_unit_warning(UNIT(m), "Unmounting timed out. Skipping SIGKILL. Ignoring.");
if (m->from_proc_self_mountinfo)
mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
else
mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
}
break;
case MOUNT_MOUNTING_SIGKILL:
case MOUNT_REMOUNTING_SIGKILL:
case MOUNT_UNMOUNTING_SIGKILL:
log_unit_warning(UNIT(m),"Mount process still around after SIGKILL. Ignoring.");
if (m->from_proc_self_mountinfo)
mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
else
mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
break;
default:
assert_not_reached("Timeout at wrong time.");
}
return 0;
}
static int mount_setup_unit(
Manager *m,
const char *what,
const char *where,
const char *options,
const char *fstype,
bool set_flags) {
_cleanup_free_ char *e = NULL, *w = NULL, *o = NULL, *f = NULL;
bool load_extras = false;
MountParameters *p;
bool delete, changed = false;
Unit *u;
int r;
assert(m);
assert(what);
assert(where);
assert(options);
assert(fstype);
/* 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;
r = unit_name_from_path(where, ".mount", &e);
if (r < 0)
return r;
u = manager_get_unit(m, e);
if (!u) {
delete = true;
u = unit_new(m, sizeof(Mount));
if (!u)
return log_oom();
r = unit_add_name(u, e);
if (r < 0)
goto fail;
MOUNT(u)->where = strdup(where);
if (!MOUNT(u)->where) {
r = -ENOMEM;
goto fail;
}
u->source_path = strdup("/proc/self/mountinfo");
if (!u->source_path) {
r = -ENOMEM;
goto fail;
}
if (m->running_as == MANAGER_SYSTEM) {
const char* target;
target = mount_needs_network(options, fstype) ? SPECIAL_REMOTE_FS_TARGET : SPECIAL_LOCAL_FS_TARGET;
r = unit_add_dependency_by_name(u, UNIT_BEFORE, target, NULL, true);
if (r < 0)
goto fail;
if (should_umount(MOUNT(u))) {
r = unit_add_dependency_by_name(u, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true);
if (r < 0)
goto fail;
}
}
unit_add_to_load_queue(u);
changed = true;
} else {
delete = false;
if (!MOUNT(u)->where) {
MOUNT(u)->where = strdup(where);
if (!MOUNT(u)->where) {
r = -ENOMEM;
goto fail;
}
}
if (m->running_as == MANAGER_SYSTEM &&
mount_needs_network(options, fstype)) {
/* _netdev option may have shown up late, or on a
* remount. Add remote-fs dependencies, even though
* local-fs ones may already be there. */
unit_add_dependency_by_name(u, UNIT_BEFORE, SPECIAL_REMOTE_FS_TARGET, NULL, true);
load_extras = true;
}
if (u->load_state == UNIT_NOT_FOUND) {
u->load_state = UNIT_LOADED;
u->load_error = 0;
/* Load in the extras later on, after we
* finished initialization of the unit */
load_extras = true;
changed = true;
}
}
w = strdup(what);
o = strdup(options);
f = strdup(fstype);
if (!w || !o || !f) {
r = -ENOMEM;
goto fail;
}
p = &MOUNT(u)->parameters_proc_self_mountinfo;
changed = changed ||
!streq_ptr(p->options, options) ||
!streq_ptr(p->what, what) ||
!streq_ptr(p->fstype, fstype);
if (set_flags) {
MOUNT(u)->is_mounted = true;
MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
MOUNT(u)->just_changed = changed;
}
MOUNT(u)->from_proc_self_mountinfo = true;
free(p->what);
p->what = w;
w = NULL;
free(p->options);
p->options = o;
o = NULL;
free(p->fstype);
p->fstype = f;
f = NULL;
if (load_extras) {
r = mount_add_extras(MOUNT(u));
if (r < 0)
goto fail;
}
if (changed)
unit_add_to_dbus_queue(u);
return 0;
fail:
log_warning_errno(r, "Failed to set up mount unit: %m");
if (delete && u)
unit_free(u);
return r;
}
static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
_cleanup_(mnt_free_tablep) struct libmnt_table *t = NULL;
_cleanup_(mnt_free_iterp) struct libmnt_iter *i = NULL;
int r = 0;
assert(m);
t = mnt_new_table();
if (!t)
return log_oom();
i = mnt_new_iter(MNT_ITER_FORWARD);
if (!i)
return log_oom();
r = mnt_table_parse_mtab(t, NULL);
if (r < 0)
return log_error_errno(r, "Failed to parse /proc/self/mountinfo: %m");
r = 0;
for (;;) {
const char *device, *path, *options, *fstype;
_cleanup_free_ char *d = NULL, *p = NULL;
struct libmnt_fs *fs;
int k;
k = mnt_table_next_fs(t, i, &fs);
if (k == 1)
break;
if (k < 0)
return log_error_errno(k, "Failed to get next entry from /proc/self/mountinfo: %m");
device = mnt_fs_get_source(fs);
path = mnt_fs_get_target(fs);
options = mnt_fs_get_options(fs);
fstype = mnt_fs_get_fstype(fs);
if (!device || !path)
continue;
if (cunescape(device, UNESCAPE_RELAX, &d) < 0)
return log_oom();
if (cunescape(path, UNESCAPE_RELAX, &p) < 0)
return log_oom();
(void) device_found_node(m, d, true, DEVICE_FOUND_MOUNT, set_flags);
k = mount_setup_unit(m, d, p, options, fstype, set_flags);
if (r == 0 && k < 0)
r = k;
}
return r;
}
static void mount_shutdown(Manager *m) {
assert(m);
m->mount_event_source = sd_event_source_unref(m->mount_event_source);
m->mount_utab_event_source = sd_event_source_unref(m->mount_utab_event_source);
m->proc_self_mountinfo = safe_fclose(m->proc_self_mountinfo);
m->utab_inotify_fd = safe_close(m->utab_inotify_fd);
}
static int mount_get_timeout(Unit *u, uint64_t *timeout) {
Mount *m = MOUNT(u);
int r;
if (!m->timer_event_source)
return 0;
r = sd_event_source_get_time(m->timer_event_source, timeout);
if (r < 0)
return r;
return 1;
}
static int mount_enumerate(Manager *m) {
int r;
assert(m);
mnt_init_debug(0);
if (!m->proc_self_mountinfo) {
m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "re");
if (!m->proc_self_mountinfo)
return -errno;
r = sd_event_add_io(m->event, &m->mount_event_source, fileno(m->proc_self_mountinfo), EPOLLPRI, mount_dispatch_io, m);
if (r < 0)
goto fail;
/* Dispatch this before we dispatch SIGCHLD, so that
* we always get the events from /proc/self/mountinfo
* before the SIGCHLD of /usr/bin/mount. */
r = sd_event_source_set_priority(m->mount_event_source, -10);
if (r < 0)
goto fail;
(void) sd_event_source_set_description(m->mount_event_source, "mount-mountinfo-dispatch");
}
if (m->utab_inotify_fd < 0) {
m->utab_inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
if (m->utab_inotify_fd < 0) {
r = -errno;
goto fail;
}
(void) mkdir_p_label("/run/mount", 0755);
r = inotify_add_watch(m->utab_inotify_fd, "/run/mount", IN_MOVED_TO);
if (r < 0) {
r = -errno;
goto fail;
}
r = sd_event_add_io(m->event, &m->mount_utab_event_source, m->utab_inotify_fd, EPOLLIN, mount_dispatch_io, m);
if (r < 0)
goto fail;
r = sd_event_source_set_priority(m->mount_utab_event_source, -10);
if (r < 0)
goto fail;
(void) sd_event_source_set_description(m->mount_utab_event_source, "mount-utab-dispatch");
}
r = mount_load_proc_self_mountinfo(m, false);
if (r < 0)
goto fail;
return 0;
fail:
mount_shutdown(m);
return r;
}
static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
_cleanup_set_free_ Set *around = NULL, *gone = NULL;
Manager *m = userdata;
const char *what;
Iterator i;
Unit *u;
int r;
assert(m);
assert(revents & (EPOLLPRI | EPOLLIN));
/* The manager calls this for every fd event happening on the
* /proc/self/mountinfo file, which informs us about mounting
* table changes, and for /run/mount events which we watch
* for mount options. */
if (fd == m->utab_inotify_fd) {
bool rescan = false;
/* FIXME: We *really* need to replace this with
* libmount's own API for this, we should not hardcode
* internal behaviour of libmount here. */
for (;;) {
union inotify_event_buffer buffer;
struct inotify_event *e;
ssize_t l;
l = read(fd, &buffer, sizeof(buffer));
if (l < 0) {
if (errno == EAGAIN || errno == EINTR)
break;
log_error_errno(errno, "Failed to read utab inotify: %m");
break;
}
FOREACH_INOTIFY_EVENT(e, buffer, l) {
/* Only care about changes to utab,
* but we have to monitor the
* directory to reliably get
* notifications about when utab is
* replaced using rename(2) */
if ((e->mask & IN_Q_OVERFLOW) || streq(e->name, "utab"))
rescan = true;
}
}
if (!rescan)
return 0;
}
r = mount_load_proc_self_mountinfo(m, true);
if (r < 0) {
/* Reset flags, just in case, for later calls */
LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
Mount *mount = MOUNT(u);
mount->is_mounted = mount->just_mounted = mount->just_changed = false;
}
return 0;
}
manager_dispatch_load_queue(m);
LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
Mount *mount = MOUNT(u);
if (!mount->is_mounted) {
/* A mount point is not around right now. It
* might be gone, or might never have
* existed. */
if (mount->from_proc_self_mountinfo &&
mount->parameters_proc_self_mountinfo.what) {
/* Remember that this device might just have disappeared */
if (set_ensure_allocated(&gone, &string_hash_ops) < 0 ||
set_put(gone, mount->parameters_proc_self_mountinfo.what) < 0)
log_oom(); /* we don't care too much about OOM here... */
}
mount->from_proc_self_mountinfo = false;
switch (mount->state) {
case MOUNT_MOUNTED:
/* This has just been unmounted by
* somebody else, follow the state
* change. */
mount_enter_dead(mount, MOUNT_SUCCESS);
break;
default:
break;
}
} else if (mount->just_mounted || mount->just_changed) {
/* A mount point was added or changed */
switch (mount->state) {
case MOUNT_DEAD:
case MOUNT_FAILED:
/* This has just been mounted by
* somebody else, follow the state
* change. */
mount_enter_mounted(mount, MOUNT_SUCCESS);
break;
case MOUNT_MOUNTING:
mount_set_state(mount, MOUNT_MOUNTING_DONE);
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;
}
}
if (mount->is_mounted &&
mount->from_proc_self_mountinfo &&
mount->parameters_proc_self_mountinfo.what) {
if (set_ensure_allocated(&around, &string_hash_ops) < 0 ||
set_put(around, mount->parameters_proc_self_mountinfo.what) < 0)
log_oom();
}
/* Reset the flags for later calls */
mount->is_mounted = mount->just_mounted = mount->just_changed = false;
}
SET_FOREACH(what, gone, i) {
if (set_contains(around, what))
continue;
/* Let the device units know that the device is no longer mounted */
(void) device_found_node(m, what, false, DEVICE_FOUND_MOUNT, true);
}
return 0;
}
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->result = MOUNT_SUCCESS;
m->reload_result = MOUNT_SUCCESS;
}
static int mount_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
return unit_kill_common(u, who, signo, -1, MOUNT(u)->control_pid, error);
}
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);
static const char* const mount_result_table[_MOUNT_RESULT_MAX] = {
[MOUNT_SUCCESS] = "success",
[MOUNT_FAILURE_RESOURCES] = "resources",
[MOUNT_FAILURE_TIMEOUT] = "timeout",
[MOUNT_FAILURE_EXIT_CODE] = "exit-code",
[MOUNT_FAILURE_SIGNAL] = "signal",
[MOUNT_FAILURE_CORE_DUMP] = "core-dump"
};
DEFINE_STRING_TABLE_LOOKUP(mount_result, MountResult);
const UnitVTable mount_vtable = {
.object_size = sizeof(Mount),
.exec_context_offset = offsetof(Mount, exec_context),
.cgroup_context_offset = offsetof(Mount, cgroup_context),
.kill_context_offset = offsetof(Mount, kill_context),
.exec_runtime_offset = offsetof(Mount, exec_runtime),
.sections =
"Unit\0"
"Mount\0"
"Install\0",
.private_section = "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,
.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,
.reset_failed = mount_reset_failed,
.bus_vtable = bus_mount_vtable,
.bus_set_property = bus_mount_set_property,
.bus_commit_properties = bus_mount_commit_properties,
.get_timeout = mount_get_timeout,
.can_transient = true,
.enumerate = mount_enumerate,
.shutdown = mount_shutdown,
.status_message_formats = {
.starting_stopping = {
[0] = "Mounting %s...",
[1] = "Unmounting %s...",
},
.finished_start_job = {
[JOB_DONE] = "Mounted %s.",
[JOB_FAILED] = "Failed to mount %s.",
[JOB_TIMEOUT] = "Timed out mounting %s.",
},
.finished_stop_job = {
[JOB_DONE] = "Unmounted %s.",
[JOB_FAILED] = "Failed unmounting %s.",
[JOB_TIMEOUT] = "Timed out unmounting %s.",
},
},
};
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