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mount.c
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mount.c
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/***
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 <signal.h>
#include <stdio.h>
#include <sys/epoll.h>
#include "sd-messages.h"
#include "alloc-util.h"
#include "dbus-mount.h"
#include "escape.h"
#include "exit-status.h"
#include "format-util.h"
#include "fstab-util.h"
#include "log.h"
#include "manager.h"
#include "mkdir.h"
#include "mount-setup.h"
#include "mount-util.h"
#include "mount.h"
#include "parse-util.h"
#include "path-util.h"
#include "process-util.h"
#include "special.h"
#include "string-table.h"
#include "string-util.h"
#include "strv.h"
#include "unit-name.h"
#include "unit.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_loop(const MountParameters *p) {
assert(p);
if (fstab_test_option(p->options, "loop\0"))
return true;
return false;
}
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 mount_is_automount(const MountParameters *p) {
assert(p);
return fstab_test_option(p->options,
"comment=systemd.automount\0"
"x-systemd.automount\0");
}
static bool mount_state_active(MountState state) {
return IN_SET(state,
MOUNT_MOUNTING,
MOUNT_MOUNTING_DONE,
MOUNT_REMOUNTING,
MOUNT_UNMOUNTING,
MOUNT_MOUNTING_SIGTERM,
MOUNT_MOUNTING_SIGKILL,
MOUNT_UNMOUNTING_SIGTERM,
MOUNT_UNMOUNTING_SIGKILL,
MOUNT_REMOUNTING_SIGTERM,
MOUNT_REMOUNTING_SIGKILL);
}
static bool mount_is_bound_to_device(const Mount *m) {
const MountParameters *p;
if (m->from_fragment)
return true;
p = &m->parameters_proc_self_mountinfo;
return fstab_test_option(p->options, "x-systemd.device-bound\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;
/* 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, usec_t usec) {
int r;
assert(m);
if (m->timer_event_source) {
r = sd_event_source_set_time(m->timer_event_source, usec);
if (r < 0)
return r;
return sd_event_source_set_enabled(m->timer_event_source, SD_EVENT_ONESHOT);
}
if (usec == USEC_INFINITY)
return 0;
r = sd_event_add_time(
UNIT(m)->manager->event,
&m->timer_event_source,
CLOCK_MONOTONIC,
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;
dynamic_creds_unref(&m->dynamic_creds);
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 */
parent = dirname_malloc(m->where);
if (!parent)
return -ENOMEM;
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 or a loop mount) to be
* available. */
pm = get_mount_parameters_fragment(m);
if (pm && pm->what &&
path_is_absolute(pm->what) &&
(mount_is_bind(pm) || mount_is_loop(pm) || !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;
UnitDependency dep;
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) && !mount_is_automount(p) && MANAGER_IS_SYSTEM(UNIT(m)->manager))
device_wants_mount = true;
/* Mount units from /proc/self/mountinfo are not bound to devices
* by default since they're subject to races when devices are
* unplugged. But the user can still force this dep with an
* appropriate option (or udev property) so the mount units are
* automatically stopped when the device disappears suddenly. */
dep = mount_is_bound_to_device(m) ? UNIT_BINDS_TO : UNIT_REQUIRES;
r = unit_add_node_link(UNIT(m), p->what, device_wants_mount, dep);
if (r < 0)
return r;
return 0;
}
static int mount_add_quota_links(Mount *m) {
int r;
MountParameters *p;
assert(m);
if (!MANAGER_IS_SYSTEM(UNIT(m)->manager))
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 mount_is_extrinsic(Mount *m) {
MountParameters *p;
assert(m);
/* Returns true for all units that are "magic" and should be excluded from the usual start-up and shutdown
* dependencies. We call them "extrinsic" here, as they are generally mounted outside of the systemd dependency
* logic. We shouldn't attempt to manage them ourselves but it's fine if the user operates on them with us. */
if (!MANAGER_IS_SYSTEM(UNIT(m)->manager)) /* We only automatically manage mounts if we are in system mode */
return true;
if (PATH_IN_SET(m->where, /* Don't bother with the OS data itself */
"/",
"/usr"))
return true;
if (PATH_STARTSWITH_SET(m->where,
"/run/initramfs", /* This should stay around from before we boot until after we shutdown */
"/proc", /* All of this is API VFS */
"/sys", /* … dito … */
"/dev")) /* … dito … */
return true;
/* If this is an initrd mount, and we are not in the initrd, then leave this around forever, too. */
p = get_mount_parameters(m);
if (p && fstab_test_option(p->options, "x-initrd.mount\0") && !in_initrd())
return true;
return false;
}
static int mount_add_default_dependencies(Mount *m) {
MountParameters *p;
const char *after;
int r;
assert(m);
if (!UNIT(m)->default_dependencies)
return 0;
/* We do not add any default dependencies to /, /usr or /run/initramfs/, 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 (mount_is_extrinsic(m))
return 0;
p = get_mount_parameters(m);
if (!p)
return 0;
if (mount_is_network(p)) {
/* We order ourselves after network.target. This is
* primarily useful at shutdown: services that take
* down the network should order themselves before
* network.target, so that they are shut down only
* after this mount unit is stopped. */
r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_NETWORK_TARGET, NULL, true);
if (r < 0)
return r;
/* We pull in network-online.target, and order
* ourselves after it. This is useful at start-up to
* actively pull in tools that want to be started
* before we start mounting network file systems, and
* whose purpose it is to delay this until the network
* is "up". */
r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_WANTS, UNIT_AFTER, SPECIAL_NETWORK_ONLINE_TARGET, NULL, true);
if (r < 0)
return r;
after = SPECIAL_REMOTE_FS_PRE_TARGET;
} else
after = SPECIAL_LOCAL_FS_PRE_TARGET;
r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, NULL, true);
if (r < 0)
return r;
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;
MountParameters *p;
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;
}
p = get_mount_parameters_fragment(m);
if (p && !p->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;
r = mount_add_default_dependencies(m);
if (r < 0)
return r;
return 0;
}
static int mount_load_root_mount(Unit *u) {
assert(u);
if (!unit_has_name(u, SPECIAL_ROOT_MOUNT))
return 0;
u->perpetual = true;
u->default_dependencies = false;
/* The stdio/kmsg bridge socket is on /, in order to avoid a dep loop, don't use kmsg logging for -.mount */
MOUNT(u)->exec_context.std_output = EXEC_OUTPUT_NULL;
MOUNT(u)->exec_context.std_input = EXEC_INPUT_NULL;
if (!u->description)
u->description = strdup("Root Mount");
return 1;
}
static int mount_load(Unit *u) {
Mount *m = MOUNT(u);
int r;
assert(u);
assert(u->load_state == UNIT_STUB);
r = mount_load_root_mount(u);
if (r < 0)
return r;
if (m->from_proc_self_mountinfo || u->perpetual)
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 void mount_set_state(Mount *m, MountState state) {
MountState old_state;
assert(m);
old_state = m->state;
m->state = state;
if (!mount_state_active(state)) {
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;
}
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 (m->control_pid > 0 &&
pid_is_unwaited(m->control_pid) &&
mount_state_active(new_state)) {
r = unit_watch_pid(UNIT(m), m->control_pid);
if (r < 0)
return r;
r = mount_arm_timer(m, usec_add(u->state_change_timestamp.monotonic, m->timeout_usec));
if (r < 0)
return r;
}
if (!IN_SET(new_state, MOUNT_DEAD, MOUNT_FAILED))
(void) unit_setup_dynamic_creds(u);
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"
"%sExtrinsic: %s\n"
"%sDirectoryMode: %04o\n"
"%sSloppyOptions: %s\n"
"%sLazyUnmount: %s\n"
"%sForceUnmount: %s\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, yes_no(mount_is_extrinsic(m)),
prefix, m->directory_mode,
prefix, yes_no(m->sloppy_options),
prefix, yes_no(m->lazy_unmount),
prefix, yes_no(m->force_unmount));
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 = {
.flags = EXEC_APPLY_PERMISSIONS|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
.stdin_fd = -1,
.stdout_fd = -1,
.stderr_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)
return r;
r = unit_setup_dynamic_creds(UNIT(m));
if (r < 0)
return r;
r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
if (r < 0)
return r;
exec_params.environment = UNIT(m)->manager->environment;
exec_params.confirm_spawn = manager_get_confirm_spawn(UNIT(m)->manager);
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,
&m->dynamic_creds,
&pid);
if (r < 0)
return r;
r = unit_watch_pid(UNIT(m), pid);
if (r < 0)
/* FIXME: we need to do something here */
return r;
*_pid = pid;
return 0;
}
static void mount_enter_dead(Mount *m, MountResult f) {
assert(m);
if (m->result == MOUNT_SUCCESS)
m->result = f;
mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD);
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));
unit_unref_uid_gid(UNIT(m), true);
dynamic_creds_destroy(&m->dynamic_creds);
}
static void mount_enter_mounted(Mount *m, MountResult f) {
assert(m);
if (m->result == 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 (m->result == 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, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
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 (IN_SET(state, MOUNT_REMOUNTING_SIGTERM, 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, "-c", NULL);
if (r >= 0 && m->lazy_unmount)
r = exec_command_append(m->control_command, "-l", NULL);
if (r >= 0 && m->force_unmount)
r = exec_command_append(m->control_command, "-f", 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 (p) {
_cleanup_free_ char *opts = NULL;
r = fstab_filter_options(p->options, "nofail\0" "noauto\0" "auto\0", NULL, NULL, &opts);
if (r < 0)
goto fail;
r = exec_command_set(m->control_command, MOUNT_PATH, p->what, m->where, NULL);
if (r >= 0 && m->sloppy_options)
r = exec_command_append(m->control_command, "-s", NULL);
if (r >= 0 && p->fstype)
r = exec_command_append(m->control_command, "-t", p->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;
MountParameters *p;
assert(m);
m->control_command_id = MOUNT_EXEC_REMOUNT;
m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
p = get_mount_parameters_fragment(m);
if (p) {
const char *o;
if (p->options)
o = strjoina("remount,", p->options);
else
o = "remount";
r = exec_command_set(m->control_command, MOUNT_PATH,
p->what, m->where,
"-o", o, NULL);
if (r >= 0 && m->sloppy_options)
r = exec_command_append(m->control_command, "-s", NULL);
if (r >= 0 && p->fstype)
r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
} else
r = -ENOENT;
if (r < 0)
goto fail;
mount_unwatch_control_pid(m);