static int automount_coldplug(Unit *u) {
Automount *a = AUTOMOUNT(u);
int r;
assert(a);
assert(a->state == AUTOMOUNT_DEAD);
if (a->deserialized_state != a->state) {
r = open_dev_autofs(u->manager);
if (r < 0)
return r;
if (a->deserialized_state == AUTOMOUNT_WAITING ||
a->deserialized_state == AUTOMOUNT_RUNNING) {
assert(a->pipe_fd >= 0);
r = sd_event_add_io(u->manager->event, &a->pipe_event_source, a->pipe_fd, EPOLLIN, automount_dispatch_io, u);
if (r < 0)
return r;
(void) sd_event_source_set_description(a->pipe_event_source, "automount-io");
if (a->deserialized_state == AUTOMOUNT_RUNNING) {
r = automount_start_expire(a);
if (r < 0)
log_unit_warning_errno(UNIT(a), r, "Failed to start expiration timer, ignoring: %m");
}
}
automount_set_state(a, a->deserialized_state);
}
return 0;
}
static int automount_coldplug(Unit *u) {
Automount *a = AUTOMOUNT(u);
int r;
assert(a);
assert(a->state == AUTOMOUNT_DEAD);
if (a->deserialized_state != a->state) {
r = open_dev_autofs(u->manager);
if (r < 0)
return r;
if (a->deserialized_state == AUTOMOUNT_WAITING ||
a->deserialized_state == AUTOMOUNT_RUNNING) {
assert(a->pipe_fd >= 0);
r = sd_event_add_io(u->manager->event, a->pipe_fd, EPOLLIN, automount_dispatch_io, u, &a->pipe_event_source);
if (r < 0)
return r;
}
automount_set_state(a, a->deserialized_state);
}
return 0;
}
static void automount_enter_dead(Automount *a, AutomountResult f) {
assert(a);
if (a->result == AUTOMOUNT_SUCCESS)
a->result = f;
automount_set_state(a, a->result != AUTOMOUNT_SUCCESS ? AUTOMOUNT_FAILED : AUTOMOUNT_DEAD);
}
static void automount_enter_running(Automount *a) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
Unit *trigger;
struct stat st;
int r;
assert(a);
/* If the user masked our unit in the meantime, fail */
if (UNIT(a)->load_state != UNIT_LOADED) {
log_unit_error(UNIT(a), "Suppressing automount event since unit is no longer loaded.");
goto fail;
}
/* We don't take mount requests anymore if we are supposed to
* shut down anyway */
if (unit_stop_pending(UNIT(a))) {
log_unit_debug(UNIT(a), "Suppressing automount request since unit stop is scheduled.");
automount_send_ready(a, a->tokens, -EHOSTDOWN);
automount_send_ready(a, a->expire_tokens, -EHOSTDOWN);
return;
}
mkdir_p_label(a->where, a->directory_mode);
/* Before we do anything, let's see if somebody is playing games with us? */
if (lstat(a->where, &st) < 0) {
log_unit_warning_errno(UNIT(a), errno, "Failed to stat automount point: %m");
goto fail;
}
/* The mount unit may have been explicitly started before we got the
* autofs request. Ack it to unblock anything waiting on the mount point. */
if (!S_ISDIR(st.st_mode) || st.st_dev != a->dev_id) {
log_unit_info(UNIT(a), "Automount point already active?");
automount_send_ready(a, a->tokens, 0);
return;
}
trigger = UNIT_TRIGGER(UNIT(a));
if (!trigger) {
log_unit_error(UNIT(a), "Unit to trigger vanished.");
goto fail;
}
r = manager_add_job(UNIT(a)->manager, JOB_START, trigger, JOB_REPLACE, &error, NULL);
if (r < 0) {
log_unit_warning(UNIT(a), "Failed to queue mount startup job: %s", bus_error_message(&error, r));
goto fail;
}
automount_set_state(a, AUTOMOUNT_RUNNING);
return;
fail:
automount_enter_dead(a, AUTOMOUNT_FAILURE_RESOURCES);
}
static void automount_reset_failed(Unit *u) {
Automount *a = AUTOMOUNT(u);
assert(a);
if (a->state == AUTOMOUNT_FAILED)
automount_set_state(a, AUTOMOUNT_DEAD);
a->result = AUTOMOUNT_SUCCESS;
}
static void automount_enter_runnning(Automount *a) {
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
struct stat st;
int r;
assert(a);
/* We don't take mount requests anymore if we are supposed to
* shut down anyway */
if (unit_stop_pending(UNIT(a))) {
log_debug_unit(UNIT(a)->id,
"Suppressing automount request on %s since unit stop is scheduled.", UNIT(a)->id);
automount_send_ready(a, -EHOSTDOWN);
return;
}
mkdir_p_label(a->where, a->directory_mode);
/* Before we do anything, let's see if somebody is playing games with us? */
if (lstat(a->where, &st) < 0) {
log_warning_unit(UNIT(a)->id,
"%s failed to stat automount point: %m", UNIT(a)->id);
goto fail;
}
if (!S_ISDIR(st.st_mode) || st.st_dev != a->dev_id)
log_info_unit(UNIT(a)->id,
"%s's automount point already active?", UNIT(a)->id);
else {
r = manager_add_job(UNIT(a)->manager, JOB_START, UNIT_TRIGGER(UNIT(a)),
JOB_REPLACE, true, &error, NULL);
if (r < 0) {
log_warning_unit(UNIT(a)->id,
"%s failed to queue mount startup job: %s",
UNIT(a)->id, bus_error_message(&error, r));
goto fail;
}
}
automount_set_state(a, AUTOMOUNT_RUNNING);
return;
fail:
automount_enter_dead(a, AUTOMOUNT_FAILURE_RESOURCES);
}
static void automount_enter_waiting(Automount *a) {
_cleanup_close_ int ioctl_fd = -1;
int p[2] = { -1, -1 };
char name[sizeof("systemd-")-1 + DECIMAL_STR_MAX(pid_t) + 1];
char options[sizeof("fd=,pgrp=,minproto=5,maxproto=5,direct")-1
+ DECIMAL_STR_MAX(int) + DECIMAL_STR_MAX(gid_t) + 1];
bool mounted = false;
int r, dev_autofs_fd;
struct stat st;
assert(a);
assert(a->pipe_fd < 0);
assert(a->where);
set_clear(a->tokens);
r = unit_fail_if_symlink(UNIT(a), a->where);
if (r < 0)
goto fail;
(void) mkdir_p_label(a->where, 0555);
unit_warn_if_dir_nonempty(UNIT(a), a->where);
dev_autofs_fd = open_dev_autofs(UNIT(a)->manager);
if (dev_autofs_fd < 0) {
r = dev_autofs_fd;
goto fail;
}
if (pipe2(p, O_NONBLOCK|O_CLOEXEC) < 0) {
r = -errno;
goto fail;
}
xsprintf(options, "fd=%i,pgrp="PID_FMT",minproto=5,maxproto=5,direct", p[1], getpgrp());
xsprintf(name, "systemd-"PID_FMT, getpid());
if (mount(name, a->where, "autofs", 0, options) < 0) {
r = -errno;
goto fail;
}
mounted = true;
p[1] = safe_close(p[1]);
if (stat(a->where, &st) < 0) {
r = -errno;
goto fail;
}
ioctl_fd = open_ioctl_fd(dev_autofs_fd, a->where, st.st_dev);
if (ioctl_fd < 0) {
r = ioctl_fd;
goto fail;
}
r = autofs_protocol(dev_autofs_fd, ioctl_fd);
if (r < 0)
goto fail;
r = autofs_set_timeout(dev_autofs_fd, ioctl_fd, a->timeout_idle_usec);
if (r < 0)
goto fail;
/* Autofs fun fact:
*
* Unless we close the ioctl fd here, for some weird reason
* the direct mount will not receive events from the
* kernel. */
r = sd_event_add_io(UNIT(a)->manager->event, &a->pipe_event_source, p[0], EPOLLIN, automount_dispatch_io, a);
if (r < 0)
goto fail;
(void) sd_event_source_set_description(a->pipe_event_source, "automount-io");
a->pipe_fd = p[0];
a->dev_id = st.st_dev;
automount_set_state(a, AUTOMOUNT_WAITING);
return;
fail:
log_unit_error_errno(UNIT(a), r, "Failed to initialize automounter: %m");
safe_close_pair(p);
if (mounted) {
r = repeat_unmount(a->where, MNT_DETACH);
if (r < 0)
log_error_errno(r, "Failed to unmount, ignoring: %m");
}
automount_enter_dead(a, AUTOMOUNT_FAILURE_RESOURCES);
}
static void automount_trigger_notify(Unit *u, Unit *other) {
Automount *a = AUTOMOUNT(u);
int r;
assert(a);
assert(other);
/* Filter out invocations with bogus state */
if (other->load_state != UNIT_LOADED || other->type != UNIT_MOUNT)
return;
/* Don't propagate state changes from the mount if we are already down */
if (!IN_SET(a->state, AUTOMOUNT_WAITING, AUTOMOUNT_RUNNING))
return;
/* Propagate start limit hit state */
if (other->start_limit_hit) {
automount_enter_dead(a, AUTOMOUNT_FAILURE_MOUNT_START_LIMIT_HIT);
return;
}
/* Don't propagate anything if there's still a job queued */
if (other->job)
return;
/* The mount is successfully established */
if (IN_SET(MOUNT(other)->state, MOUNT_MOUNTED, MOUNT_REMOUNTING)) {
(void) automount_send_ready(a, a->tokens, 0);
r = automount_start_expire(a);
if (r < 0)
log_unit_warning_errno(UNIT(a), r, "Failed to start expiration timer, ignoring: %m");
automount_set_state(a, AUTOMOUNT_RUNNING);
}
if (IN_SET(MOUNT(other)->state,
MOUNT_MOUNTING, MOUNT_MOUNTING_DONE,
MOUNT_MOUNTED, MOUNT_REMOUNTING,
MOUNT_MOUNTING_SIGTERM, MOUNT_MOUNTING_SIGKILL,
MOUNT_REMOUNTING_SIGTERM, MOUNT_REMOUNTING_SIGKILL,
MOUNT_UNMOUNTING_SIGTERM, MOUNT_UNMOUNTING_SIGKILL,
MOUNT_FAILED)) {
(void) automount_send_ready(a, a->expire_tokens, -ENODEV);
}
if (MOUNT(other)->state == MOUNT_DEAD)
(void) automount_send_ready(a, a->expire_tokens, 0);
/* The mount is in some unhappy state now, let's unfreeze any waiting clients */
if (IN_SET(MOUNT(other)->state,
MOUNT_DEAD, MOUNT_UNMOUNTING,
MOUNT_MOUNTING_SIGTERM, MOUNT_MOUNTING_SIGKILL,
MOUNT_REMOUNTING_SIGTERM, MOUNT_REMOUNTING_SIGKILL,
MOUNT_UNMOUNTING_SIGTERM, MOUNT_UNMOUNTING_SIGKILL,
MOUNT_FAILED)) {
(void) automount_send_ready(a, a->tokens, -ENODEV);
automount_set_state(a, AUTOMOUNT_WAITING);
}
}
static void automount_enter_waiting(Automount *a) {
int p[2] = { -1, -1 };
char name[32], options[128];
bool mounted = false;
int r, ioctl_fd = -1, dev_autofs_fd;
struct stat st;
assert(a);
assert(a->pipe_fd < 0);
assert(a->where);
if (a->tokens)
set_clear(a->tokens);
dev_autofs_fd = open_dev_autofs(UNIT(a)->manager);
if (dev_autofs_fd < 0) {
r = dev_autofs_fd;
goto fail;
}
/* We knowingly ignore the results of this call */
mkdir_p_label(a->where, 0555);
warn_if_dir_nonempty(a->meta.id, a->where);
if (pipe2(p, O_NONBLOCK|O_CLOEXEC) < 0) {
r = -errno;
goto fail;
}
snprintf(options, sizeof(options), "fd=%i,pgrp=%u,minproto=5,maxproto=5,direct", p[1], (unsigned) getpgrp());
char_array_0(options);
snprintf(name, sizeof(name), "systemd-%u", (unsigned) getpid());
char_array_0(name);
if (mount(name, a->where, "autofs", 0, options) < 0) {
r = -errno;
goto fail;
}
mounted = true;
close_nointr_nofail(p[1]);
p[1] = -1;
if (stat(a->where, &st) < 0) {
r = -errno;
goto fail;
}
ioctl_fd = open_ioctl_fd(dev_autofs_fd, a->where, st.st_dev);
if (ioctl_fd < 0) {
r = ioctl_fd;
goto fail;
}
r = autofs_protocol(dev_autofs_fd, ioctl_fd);
if (r < 0)
goto fail;
r = autofs_set_timeout(dev_autofs_fd, ioctl_fd, 300);
if (r < 0)
goto fail;
/* Autofs fun fact:
*
* Unless we close the ioctl fd here, for some weird reason
* the direct mount will not receive events from the
* kernel. */
close_nointr_nofail(ioctl_fd);
ioctl_fd = -1;
r = sd_event_add_io(UNIT(a)->manager->event, p[0], EPOLLIN, automount_dispatch_io, a, &a->pipe_event_source);
if (r < 0)
goto fail;
a->pipe_fd = p[0];
a->dev_id = st.st_dev;
automount_set_state(a, AUTOMOUNT_WAITING);
return;
fail:
assert_se(close_pipe(p) == 0);
if (ioctl_fd >= 0)
close_nointr_nofail(ioctl_fd);
if (mounted)
repeat_unmount(a->where);
log_error_unit(UNIT(a)->id,
"Failed to initialize automounter: %s", strerror(-r));
automount_enter_dead(a, AUTOMOUNT_FAILURE_RESOURCES);
}
