#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 "dbus-unit.h"

#include "device.h"

#include "exit-status.h"

#include "format-util.h"

#include "fstab-util.h"

#include "libmount-util.h"

#include "log.h"

#include "manager.h"

#include "mkdir.h"

#include "mount-setup.h"

#include "mount.h"

#include "mountpoint-util.h"

#include "parse-util.h"

#include "path-util.h"

#include "process-util.h"

#include "serialize.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

static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {

[MOUNT_DEAD] = UNIT_INACTIVE,

[MOUNT_MOUNTING] = UNIT_ACTIVATING,

[MOUNT_MOUNTING_DONE] = UNIT_ACTIVATING,

[MOUNT_MOUNTED] = UNIT_ACTIVE,

[MOUNT_REMOUNTING] = UNIT_RELOADING,

[MOUNT_UNMOUNTING] = 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,

[MOUNT_CLEANING] = UNIT_MAINTENANCE,

};

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 int mount_process_proc_self_mountinfo(Manager *m);

static bool MOUNT_STATE_WITH_PROCESS(MountState state) {

return IN_SET(state,

MOUNT_MOUNTING,

MOUNT_MOUNTING_DONE,

MOUNT_REMOUNTING,

MOUNT_REMOUNTING_SIGTERM,

MOUNT_REMOUNTING_SIGKILL,

MOUNT_UNMOUNTING,

MOUNT_UNMOUNTING_SIGTERM,

MOUNT_UNMOUNTING_SIGKILL,

MOUNT_CLEANING);

}

static MountParameters* get_mount_parameters_fragment(Mount *m) {

assert(m);

if (m->from_fragment)

return &m->parameters_fragment;

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_fragment(m);

}

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_is_network(const MountParameters *p) {

assert(p);

if (fstab_test_option(p->options, "_netdev\0"))

return true;

if (p->fstype && fstype_is_network(p->fstype))

return true;

return false;

}

static bool mount_is_nofail(const Mount *m) {

assert(m);

if (!m->from_fragment)

return false;

return fstab_test_yes_no_option(m->parameters_fragment.options, "nofail\0" "fail\0");

}

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_bound_to_device(Mount *m) {

const MountParameters *p;

assert(m);

/* Determines whether to place a Requires= or BindsTo= dependency on the backing device unit. We do

p = get_mount_parameters(m);

if (!p)

return false;

return fstab_test_option(p->options, "x-systemd.device-bound\0");

}

static bool mount_propagate_stop(Mount *m) {

assert(m);

if (mount_is_bound_to_device(m)) /* If we are using BindsTo= the stop propagation is implicit, no need to bother */

return false;

return m->from_fragment; /* let's propagate stop whenever this is an explicitly configured unit,

}

static bool mount_needs_quota(const MountParameters *p) {

assert(p);

/* Quotas are not enabled on network filesystems, but we want them, for example, on storage connected via

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->exec_context.std_output = u->manager->default_std_output;

m->exec_context.std_error = u->manager->default_std_error;

m->directory_mode = 0755;

/* We need to make sure that /usr/bin/mount is always called

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);

p->what = mfree(p->what);

p->options = mfree(p->options);

p->fstype = mfree(p->fstype);

}

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, false);

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_disable_unref(m->timer_event_source);

}

static int update_parameters_proc_self_mountinfo(

const char *fstype) {

MountParameters *p;

int r, q, w;

p = &m->parameters_proc_self_mountinfo;

r = free_and_strdup(&p->what, what);

if (r < 0)

return r;

q = free_and_strdup(&p->options, options);

if (q < 0)

return q;

w = free_and_strdup(&p->fstype, fstype);

if (w < 0)

return w;

return r > 0 || q > 0 || w > 0;

}

static int mount_add_mount_dependencies(Mount *m) {

MountParameters *pm;

Unit *other;

Set *s;

int r;

assert(m);

if (!path_equal(m->where, "/")) {

_cleanup_free_ char *parent = NULL;

/* 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, UNIT_DEPENDENCY_IMPLICIT);

if (r < 0)

return r;

}

/* Adds in dependencies to other mount points that might be needed for the source path (if this is a bind mount

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, UNIT_DEPENDENCY_FILE);

if (r < 0)

return r;

}

/* Adds in dependencies 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) {

if (other->load_state != UNIT_LOADED)

continue;

if (other == UNIT(m))

continue;

r = unit_add_dependency(other, UNIT_AFTER, UNIT(m), true, UNIT_DEPENDENCY_PATH);

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, UNIT_DEPENDENCY_PATH);

if (r < 0)

return r;

}

}

return 0;

}

static int mount_add_device_dependencies(Mount *m) {

UnitDependencyMask mask;

MountParameters *p;

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

if (PATH_IN_SET(p->what, "/dev/root", "/dev/nfs"))

return 0;

if (path_equal(m->where, "/"))

return 0;

/* Mount units from /proc/self/mountinfo are not bound to devices by default since they're subject to

dep = mount_is_bound_to_device(m) ? UNIT_BINDS_TO : UNIT_REQUIRES;

/* We always use 'what' from /proc/self/mountinfo if mounted */

mask = m->from_proc_self_mountinfo ? UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT : UNIT_DEPENDENCY_FILE;

r = unit_add_node_dependency(UNIT(m), p->what, dep, mask);

if (r < 0)

return r;

if (mount_propagate_stop(m)) {

r = unit_add_node_dependency(UNIT(m), p->what, UNIT_STOP_PROPAGATED_FROM, mask);

if (r < 0)

return r;

}

return unit_add_blockdev_dependency(UNIT(m), p->what, mask);

}

static int mount_add_quota_dependencies(Mount *m) {

UnitDependencyMask mask;

MountParameters *p;

int r;

assert(m);

if (!MANAGER_IS_SYSTEM(UNIT(m)->manager))

return 0;

p = get_mount_parameters_fragment(m);

if (!p)

return 0;

if (!mount_needs_quota(p))

return 0;

mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT;

r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, true, mask);

if (r < 0)

return r;

r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, true, mask);

if (r < 0)

return r;

return 0;

}

static bool mount_is_extrinsic(Unit *u) {

MountParameters *p;

Mount *m = MOUNT(u);

assert(m);

/* Returns true for all units that are "magic" and should be excluded from the usual

/* We only automatically manage mounts if we are in system mode */

if (MANAGER_IS_USER(u->manager))

return true;

p = get_mount_parameters(m);

if (p && fstab_is_extrinsic(m->where, p->options))

return true;

return false;

}

static int mount_add_default_ordering_dependencies(

Mount *m,

MountParameters *p,

UnitDependencyMask mask) {

const char *after, *before, *e;

int r;

assert(m);

e = path_startswith(m->where, "/sysroot");

if (e && in_initrd()) {

/* All mounts under /sysroot need to happen later, at initrd-fs.target time. IOW,

after = NULL;

before = isempty(e) ? SPECIAL_INITRD_ROOT_FS_TARGET : SPECIAL_INITRD_FS_TARGET;

} else if (mount_is_network(p)) {

after = SPECIAL_REMOTE_FS_PRE_TARGET;

before = SPECIAL_REMOTE_FS_TARGET;

} else {

after = SPECIAL_LOCAL_FS_PRE_TARGET;

before = SPECIAL_LOCAL_FS_TARGET;

}

if (!mount_is_nofail(m) && !mount_is_automount(p)) {

r = unit_add_dependency_by_name(UNIT(m), UNIT_BEFORE, before, true, mask);

if (r < 0)

return r;

}

if (after) {

r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, true, mask);

if (r < 0)

return r;

}

return unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS,

SPECIAL_UMOUNT_TARGET, true, mask);

}

static int mount_add_default_dependencies(Mount *m) {

UnitDependencyMask mask;

MountParameters *p;

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

if (mount_is_extrinsic(UNIT(m)))

return 0;

p = get_mount_parameters(m);

if (!p)

return 0;

mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_DEFAULT;

r = mount_add_default_ordering_dependencies(m, p, mask);

if (r < 0)

return r;

if (mount_is_network(p)) {

/* We order ourselves after network.target. This is primarily useful at shutdown:

r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_NETWORK_TARGET, true, mask);

if (r < 0)

return r;

/* We pull in network-online.target, and order ourselves after it. This is useful

r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_WANTS, UNIT_AFTER, SPECIAL_NETWORK_ONLINE_TARGET, true, mask);

if (r < 0)

return r;

}

/* If this is a tmpfs mount then we have to unmount it before we try to deactivate swaps */

if (streq_ptr(p->fstype, "tmpfs")) {

r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_SWAP_TARGET, true, mask);

if (r < 0)

return r;

}

return 0;

}

static int mount_verify(Mount *m) {

_cleanup_free_ char *e = NULL;

MountParameters *p;

int r;

assert(m);

assert(UNIT(m)->load_state == UNIT_LOADED);

if (!m->from_fragment && !m->from_proc_self_mountinfo && !UNIT(m)->perpetual)

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))

return log_unit_error_errno(UNIT(m), SYNTHETIC_ERRNO(ENOEXEC), "Where= setting doesn't match unit name. Refusing.");

if (mount_point_is_api(m->where) || mount_point_ignore(m->where))

return log_unit_error_errno(UNIT(m), SYNTHETIC_ERRNO(ENOEXEC), "Cannot create mount unit for API file system %s. Refusing.", m->where);

p = get_mount_parameters_fragment(m);

if (p && !p->what && !UNIT(m)->perpetual)

return log_unit_error_errno(UNIT(m), SYNTHETIC_ERRNO(ENOEXEC),

"What= setting is missing. Refusing.");

if (m->exec_context.pam_name && m->kill_context.kill_mode != KILL_CONTROL_GROUP)

return log_unit_error_errno(UNIT(m), SYNTHETIC_ERRNO(ENOEXEC), "Unit has PAM enabled. Kill mode must be set to control-group'. Refusing.");

return 0;

}

static int mount_add_non_exec_dependencies(Mount *m) {

int r;

assert(m);

/* Adds in all dependencies directly responsible for ordering the mount, as opposed to dependencies

r = mount_add_device_dependencies(m);

if (r < 0)

return r;

r = mount_add_mount_dependencies(m);

if (r < 0)

return r;

r = mount_add_quota_dependencies(m);

if (r < 0)

return r;

r = mount_add_default_dependencies(m);

if (r < 0)

return r;

return 0;

}

static int mount_add_extras(Mount *m) {

Unit *u = UNIT(m);

int r;

assert(m);

/* Note: this call might be called after we already have been loaded once (and even when it has already been

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_simplify(m->where);

if (!u->description) {

r = unit_set_description(u, m->where);

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_non_exec_dependencies(m);

if (r < 0)

return r;

return 0;

}

static void mount_load_root_mount(Unit *u) {

assert(u);

if (!unit_has_name(u, SPECIAL_ROOT_MOUNT))

return;

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");

}

static int mount_load(Unit *u) {

Mount *m = MOUNT(u);

int r, q = 0;

assert(u);

assert(u->load_state == UNIT_STUB);

mount_load_root_mount(u);

bool fragment_optional = m->from_proc_self_mountinfo || u->perpetual;

r = unit_load_fragment_and_dropin(u, !fragment_optional);

/* Add in some extras. Note we do this in all cases (even if we failed to load the unit) when announced by the

if (u->load_state == UNIT_LOADED || m->from_proc_self_mountinfo || u->perpetual)

q = mount_add_extras(m);

if (r < 0)

return r;

if (q < 0)

return q;

if (u->load_state != UNIT_LOADED)

return 0;

return mount_verify(m);

}

static void mount_set_state(Mount *m, MountState state) {

MountState old_state;

assert(m);

if (m->state != state)

bus_unit_send_pending_change_signal(UNIT(m), false);

old_state = m->state;

m->state = state;

if (!MOUNT_STATE_WITH_PROCESS(state)) {

m->timer_event_source = sd_event_source_disable_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 ? 0 : UNIT_NOTIFY_RELOAD_FAILURE);

}

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_WITH_PROCESS(new_state)) {

r = unit_watch_pid(UNIT(m), m->control_pid, false);

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);

(void) unit_setup_exec_runtime(u);

}

mount_set_state(m, new_state);

return 0;

}

static void mount_dump(Unit *u, FILE *f, const char *prefix) {

char buf[FORMAT_TIMESPAN_MAX];

Mount *m = MOUNT(u);

MountParameters *p;

assert(m);

assert(f);

p = get_mount_parameters(m);

fprintf(f,

"%sMount State: %s\n"

"%sResult: %s\n"

"%sClean Result: %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"

"%sReadWriteOnly: %s\n"

"%sTimeoutSec: %s\n",

prefix, mount_state_to_string(m->state),

prefix, mount_result_to_string(m->result),

prefix, mount_result_to_string(m->clean_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(u)),

prefix, m->directory_mode,

prefix, yes_no(m->sloppy_options),

prefix, yes_no(m->lazy_unmount),

prefix, yes_no(m->force_unmount),

prefix, yes_no(m->read_write_only),

prefix, format_timespan(buf, sizeof(buf), m->timeout_usec, USEC_PER_SEC));

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);

cgroup_context_dump(UNIT(m), f, prefix);

}

static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {

_cleanup_(exec_params_clear) ExecParameters exec_params = {

.flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,

.stdin_fd = -1,

.stdout_fd = -1,

.stderr_fd = -1,

.exec_fd = -1,

};

pid_t pid;

int r;

assert(m);

assert(c);

assert(_pid);

r = unit_prepare_exec(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;

r = unit_set_exec_params(UNIT(m), &exec_params);

if (r < 0)

return r;

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, true);

if (r < 0)

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;

unit_log_result(UNIT(m), m->result == MOUNT_SUCCESS, mount_result_to_string(m->result));

unit_warn_leftover_processes(UNIT(m), unit_log_leftover_process_stop);

mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD);

m->exec_runtime = exec_runtime_unref(m->exec_runtime, true);

unit_destroy_runtime_data(UNIT(m), &m->exec_context);

unit_unref_uid_gid(UNIT(m), true);

dynamic_creds_destroy(&m->dynamic_creds);

/* Any dependencies based on /proc/self/mountinfo are now stale */

unit_remove_dependencies(UNIT(m), UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);

}

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_dead_or_mounted(Mount *m, MountResult f) {

assert(m);

/* Enter DEAD or MOUNTED state, depending on what the kernel currently says about the mount point. We use this

if (m->from_proc_self_mountinfo)

mount_enter_mounted(m, f);

else

mount_enter_dead(m, f);

}

static int state_to_kill_operation(MountState state) {

switch (state) {

case MOUNT_REMOUNTING_SIGTERM:

return KILL_RESTART;

case MOUNT_UNMOUNTING_SIGTERM:

return KILL_TERMINATE;

case MOUNT_REMOUNTING_SIGKILL:

case MOUNT_UNMOUNTING_SIGKILL:

return KILL_KILL;

default:

return _KILL_OPERATION_INVALID;

}

}

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_to_kill_operation(state),

-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 && m->kill_context.send_sigkill)

mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);

else if (IN_SET(state, MOUNT_REMOUNTING_SIGTERM, MOUNT_REMOUNTING_SIGKILL))

mount_enter_mounted(m, MOUNT_SUCCESS);

else if (state == MOUNT_UNMOUNTING_SIGTERM && m->kill_context.send_sigkill)

mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS);

else

mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);

return;

fail:

log_unit_warning_errno(UNIT(m), r, "Failed to kill processes: %m");

mount_enter_dead_or_mounted(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);