463d0d1569
Previously, we had two enums ManagerRunningAs and UnitFileScope, that were mostly identical and converted from one to the other all the time. The latter had one more value UNIT_FILE_GLOBAL however. Let's simplify things, and remove ManagerRunningAs and replace it by UnitFileScope everywhere, thus making the translation unnecessary. Introduce two new macros MANAGER_IS_SYSTEM() and MANAGER_IS_USER() to simplify checking if we are running in one or the user context.
1093 lines
33 KiB
C
1093 lines
33 KiB
C
/***
|
|
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 <fcntl.h>
|
|
#include <limits.h>
|
|
#include <linux/auto_dev-ioctl.h>
|
|
#include <linux/auto_fs4.h>
|
|
#include <sys/epoll.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/stat.h>
|
|
#include <unistd.h>
|
|
|
|
#include "alloc-util.h"
|
|
#include "async.h"
|
|
#include "automount.h"
|
|
#include "bus-error.h"
|
|
#include "bus-util.h"
|
|
#include "dbus-automount.h"
|
|
#include "fd-util.h"
|
|
#include "formats-util.h"
|
|
#include "io-util.h"
|
|
#include "label.h"
|
|
#include "mkdir.h"
|
|
#include "mount-util.h"
|
|
#include "mount.h"
|
|
#include "parse-util.h"
|
|
#include "path-util.h"
|
|
#include "process-util.h"
|
|
#include "special.h"
|
|
#include "stdio-util.h"
|
|
#include "string-table.h"
|
|
#include "string-util.h"
|
|
#include "unit-name.h"
|
|
#include "unit.h"
|
|
|
|
static const UnitActiveState state_translation_table[_AUTOMOUNT_STATE_MAX] = {
|
|
[AUTOMOUNT_DEAD] = UNIT_INACTIVE,
|
|
[AUTOMOUNT_WAITING] = UNIT_ACTIVE,
|
|
[AUTOMOUNT_RUNNING] = UNIT_ACTIVE,
|
|
[AUTOMOUNT_FAILED] = UNIT_FAILED
|
|
};
|
|
|
|
struct expire_data {
|
|
int dev_autofs_fd;
|
|
int ioctl_fd;
|
|
};
|
|
|
|
static inline void expire_data_free(struct expire_data *data) {
|
|
if (!data)
|
|
return;
|
|
|
|
safe_close(data->dev_autofs_fd);
|
|
safe_close(data->ioctl_fd);
|
|
free(data);
|
|
}
|
|
|
|
DEFINE_TRIVIAL_CLEANUP_FUNC(struct expire_data*, expire_data_free);
|
|
|
|
static int open_dev_autofs(Manager *m);
|
|
static int automount_dispatch_io(sd_event_source *s, int fd, uint32_t events, void *userdata);
|
|
|
|
static void automount_init(Unit *u) {
|
|
Automount *a = AUTOMOUNT(u);
|
|
|
|
assert(u);
|
|
assert(u->load_state == UNIT_STUB);
|
|
|
|
a->pipe_fd = -1;
|
|
a->directory_mode = 0755;
|
|
UNIT(a)->ignore_on_isolate = true;
|
|
}
|
|
|
|
static int automount_send_ready(Automount *a, Set *tokens, int status);
|
|
|
|
static void unmount_autofs(Automount *a) {
|
|
int r;
|
|
|
|
assert(a);
|
|
|
|
if (a->pipe_fd < 0)
|
|
return;
|
|
|
|
automount_send_ready(a, a->tokens, -EHOSTDOWN);
|
|
automount_send_ready(a, a->expire_tokens, -EHOSTDOWN);
|
|
|
|
a->pipe_event_source = sd_event_source_unref(a->pipe_event_source);
|
|
a->pipe_fd = safe_close(a->pipe_fd);
|
|
|
|
/* If we reload/reexecute things we keep the mount point
|
|
* around */
|
|
if (a->where &&
|
|
(UNIT(a)->manager->exit_code != MANAGER_RELOAD &&
|
|
UNIT(a)->manager->exit_code != MANAGER_REEXECUTE)) {
|
|
r = repeat_unmount(a->where, MNT_DETACH);
|
|
if (r < 0)
|
|
log_error_errno(r, "Failed to unmount: %m");
|
|
}
|
|
}
|
|
|
|
static void automount_done(Unit *u) {
|
|
Automount *a = AUTOMOUNT(u);
|
|
|
|
assert(a);
|
|
|
|
unmount_autofs(a);
|
|
|
|
a->where = mfree(a->where);
|
|
|
|
a->tokens = set_free(a->tokens);
|
|
a->expire_tokens = set_free(a->expire_tokens);
|
|
|
|
a->expire_event_source = sd_event_source_unref(a->expire_event_source);
|
|
}
|
|
|
|
static int automount_add_mount_links(Automount *a) {
|
|
_cleanup_free_ char *parent = NULL;
|
|
|
|
assert(a);
|
|
|
|
parent = dirname_malloc(a->where);
|
|
if (!parent)
|
|
return -ENOMEM;
|
|
|
|
return unit_require_mounts_for(UNIT(a), parent);
|
|
}
|
|
|
|
static int automount_add_default_dependencies(Automount *a) {
|
|
int r;
|
|
|
|
assert(a);
|
|
|
|
if (!UNIT(a)->default_dependencies)
|
|
return 0;
|
|
|
|
if (!MANAGER_IS_SYSTEM(UNIT(a)->manager))
|
|
return 0;
|
|
|
|
r = unit_add_two_dependencies_by_name(UNIT(a), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int automount_verify(Automount *a) {
|
|
_cleanup_free_ char *e = NULL;
|
|
int r;
|
|
|
|
assert(a);
|
|
|
|
if (UNIT(a)->load_state != UNIT_LOADED)
|
|
return 0;
|
|
|
|
if (path_equal(a->where, "/")) {
|
|
log_unit_error(UNIT(a), "Cannot have an automount unit for the root directory. Refusing.");
|
|
return -EINVAL;
|
|
}
|
|
|
|
r = unit_name_from_path(a->where, ".automount", &e);
|
|
if (r < 0)
|
|
return log_unit_error(UNIT(a), "Failed to generate unit name from path: %m");
|
|
|
|
if (!unit_has_name(UNIT(a), e)) {
|
|
log_unit_error(UNIT(a), "Where= setting doesn't match unit name. Refusing.");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int automount_load(Unit *u) {
|
|
Automount *a = AUTOMOUNT(u);
|
|
int r;
|
|
|
|
assert(u);
|
|
assert(u->load_state == UNIT_STUB);
|
|
|
|
/* Load a .automount file */
|
|
r = unit_load_fragment_and_dropin_optional(u);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (u->load_state == UNIT_LOADED) {
|
|
Unit *x;
|
|
|
|
if (!a->where) {
|
|
r = unit_name_to_path(u->id, &a->where);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
path_kill_slashes(a->where);
|
|
|
|
r = unit_load_related_unit(u, ".mount", &x);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, x, true);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = automount_add_mount_links(a);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = automount_add_default_dependencies(a);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
return automount_verify(a);
|
|
}
|
|
|
|
static void automount_set_state(Automount *a, AutomountState state) {
|
|
AutomountState old_state;
|
|
assert(a);
|
|
|
|
old_state = a->state;
|
|
a->state = state;
|
|
|
|
if (state != AUTOMOUNT_WAITING &&
|
|
state != AUTOMOUNT_RUNNING)
|
|
unmount_autofs(a);
|
|
|
|
if (state != old_state)
|
|
log_unit_debug(UNIT(a), "Changed %s -> %s", automount_state_to_string(old_state), automount_state_to_string(state));
|
|
|
|
unit_notify(UNIT(a), state_translation_table[old_state], state_translation_table[state], true);
|
|
}
|
|
|
|
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");
|
|
}
|
|
|
|
automount_set_state(a, a->deserialized_state);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void automount_dump(Unit *u, FILE *f, const char *prefix) {
|
|
char time_string[FORMAT_TIMESPAN_MAX];
|
|
Automount *a = AUTOMOUNT(u);
|
|
|
|
assert(a);
|
|
|
|
fprintf(f,
|
|
"%sAutomount State: %s\n"
|
|
"%sResult: %s\n"
|
|
"%sWhere: %s\n"
|
|
"%sDirectoryMode: %04o\n"
|
|
"%sTimeoutIdleUSec: %s\n",
|
|
prefix, automount_state_to_string(a->state),
|
|
prefix, automount_result_to_string(a->result),
|
|
prefix, a->where,
|
|
prefix, a->directory_mode,
|
|
prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX, a->timeout_idle_usec, USEC_PER_SEC));
|
|
}
|
|
|
|
static void automount_enter_dead(Automount *a, AutomountResult f) {
|
|
assert(a);
|
|
|
|
if (f != AUTOMOUNT_SUCCESS)
|
|
a->result = f;
|
|
|
|
automount_set_state(a, a->result != AUTOMOUNT_SUCCESS ? AUTOMOUNT_FAILED : AUTOMOUNT_DEAD);
|
|
}
|
|
|
|
static int open_dev_autofs(Manager *m) {
|
|
struct autofs_dev_ioctl param;
|
|
|
|
assert(m);
|
|
|
|
if (m->dev_autofs_fd >= 0)
|
|
return m->dev_autofs_fd;
|
|
|
|
label_fix("/dev/autofs", false, false);
|
|
|
|
m->dev_autofs_fd = open("/dev/autofs", O_CLOEXEC|O_RDONLY);
|
|
if (m->dev_autofs_fd < 0)
|
|
return log_error_errno(errno, "Failed to open /dev/autofs: %m");
|
|
|
|
init_autofs_dev_ioctl(¶m);
|
|
if (ioctl(m->dev_autofs_fd, AUTOFS_DEV_IOCTL_VERSION, ¶m) < 0) {
|
|
m->dev_autofs_fd = safe_close(m->dev_autofs_fd);
|
|
return -errno;
|
|
}
|
|
|
|
log_debug("Autofs kernel version %i.%i", param.ver_major, param.ver_minor);
|
|
|
|
return m->dev_autofs_fd;
|
|
}
|
|
|
|
static int open_ioctl_fd(int dev_autofs_fd, const char *where, dev_t devid) {
|
|
struct autofs_dev_ioctl *param;
|
|
size_t l;
|
|
|
|
assert(dev_autofs_fd >= 0);
|
|
assert(where);
|
|
|
|
l = sizeof(struct autofs_dev_ioctl) + strlen(where) + 1;
|
|
param = alloca(l);
|
|
|
|
init_autofs_dev_ioctl(param);
|
|
param->size = l;
|
|
param->ioctlfd = -1;
|
|
param->openmount.devid = devid;
|
|
strcpy(param->path, where);
|
|
|
|
if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_OPENMOUNT, param) < 0)
|
|
return -errno;
|
|
|
|
if (param->ioctlfd < 0)
|
|
return -EIO;
|
|
|
|
(void) fd_cloexec(param->ioctlfd, true);
|
|
return param->ioctlfd;
|
|
}
|
|
|
|
static int autofs_protocol(int dev_autofs_fd, int ioctl_fd) {
|
|
uint32_t major, minor;
|
|
struct autofs_dev_ioctl param;
|
|
|
|
assert(dev_autofs_fd >= 0);
|
|
assert(ioctl_fd >= 0);
|
|
|
|
init_autofs_dev_ioctl(¶m);
|
|
param.ioctlfd = ioctl_fd;
|
|
|
|
if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_PROTOVER, ¶m) < 0)
|
|
return -errno;
|
|
|
|
major = param.protover.version;
|
|
|
|
init_autofs_dev_ioctl(¶m);
|
|
param.ioctlfd = ioctl_fd;
|
|
|
|
if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_PROTOSUBVER, ¶m) < 0)
|
|
return -errno;
|
|
|
|
minor = param.protosubver.sub_version;
|
|
|
|
log_debug("Autofs protocol version %i.%i", major, minor);
|
|
return 0;
|
|
}
|
|
|
|
static int autofs_set_timeout(int dev_autofs_fd, int ioctl_fd, usec_t usec) {
|
|
struct autofs_dev_ioctl param;
|
|
|
|
assert(dev_autofs_fd >= 0);
|
|
assert(ioctl_fd >= 0);
|
|
|
|
init_autofs_dev_ioctl(¶m);
|
|
param.ioctlfd = ioctl_fd;
|
|
|
|
/* Convert to seconds, rounding up. */
|
|
param.timeout.timeout = (usec + USEC_PER_SEC - 1) / USEC_PER_SEC;
|
|
|
|
if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_TIMEOUT, ¶m) < 0)
|
|
return -errno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int autofs_send_ready(int dev_autofs_fd, int ioctl_fd, uint32_t token, int status) {
|
|
struct autofs_dev_ioctl param;
|
|
|
|
assert(dev_autofs_fd >= 0);
|
|
assert(ioctl_fd >= 0);
|
|
|
|
init_autofs_dev_ioctl(¶m);
|
|
param.ioctlfd = ioctl_fd;
|
|
|
|
if (status) {
|
|
param.fail.token = token;
|
|
param.fail.status = status;
|
|
} else
|
|
param.ready.token = token;
|
|
|
|
if (ioctl(dev_autofs_fd, status ? AUTOFS_DEV_IOCTL_FAIL : AUTOFS_DEV_IOCTL_READY, ¶m) < 0)
|
|
return -errno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int automount_send_ready(Automount *a, Set *tokens, int status) {
|
|
_cleanup_close_ int ioctl_fd = -1;
|
|
unsigned token;
|
|
int r;
|
|
|
|
assert(a);
|
|
assert(status <= 0);
|
|
|
|
if (set_isempty(tokens))
|
|
return 0;
|
|
|
|
ioctl_fd = open_ioctl_fd(UNIT(a)->manager->dev_autofs_fd, a->where, a->dev_id);
|
|
if (ioctl_fd < 0)
|
|
return ioctl_fd;
|
|
|
|
if (status)
|
|
log_unit_debug_errno(UNIT(a), status, "Sending failure: %m");
|
|
else
|
|
log_unit_debug(UNIT(a), "Sending success.");
|
|
|
|
r = 0;
|
|
|
|
/* Autofs thankfully does not hand out 0 as a token */
|
|
while ((token = PTR_TO_UINT(set_steal_first(tokens)))) {
|
|
int k;
|
|
|
|
/* Autofs fun fact II:
|
|
*
|
|
* if you pass a positive status code here, the kernel will
|
|
* freeze! Yay! */
|
|
|
|
k = autofs_send_ready(UNIT(a)->manager->dev_autofs_fd,
|
|
ioctl_fd,
|
|
token,
|
|
status);
|
|
if (k < 0)
|
|
r = k;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static int automount_start_expire(Automount *a);
|
|
|
|
int automount_update_mount(Automount *a, MountState old_state, MountState state) {
|
|
int r;
|
|
|
|
assert(a);
|
|
|
|
switch (state) {
|
|
case MOUNT_MOUNTED:
|
|
case MOUNT_REMOUNTING:
|
|
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");
|
|
break;
|
|
case MOUNT_DEAD:
|
|
case MOUNT_UNMOUNTING:
|
|
case MOUNT_MOUNTING_SIGTERM:
|
|
case MOUNT_MOUNTING_SIGKILL:
|
|
case MOUNT_REMOUNTING_SIGTERM:
|
|
case MOUNT_REMOUNTING_SIGKILL:
|
|
case MOUNT_UNMOUNTING_SIGTERM:
|
|
case MOUNT_UNMOUNTING_SIGKILL:
|
|
case MOUNT_FAILED:
|
|
if (old_state != state)
|
|
automount_send_ready(a, a->tokens, -ENODEV);
|
|
(void) sd_event_source_set_enabled(a->expire_event_source, SD_EVENT_OFF);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
switch (state) {
|
|
case MOUNT_DEAD:
|
|
automount_send_ready(a, a->expire_tokens, 0);
|
|
break;
|
|
case MOUNT_MOUNTING:
|
|
case MOUNT_MOUNTING_DONE:
|
|
case MOUNT_MOUNTING_SIGTERM:
|
|
case MOUNT_MOUNTING_SIGKILL:
|
|
case MOUNT_REMOUNTING_SIGTERM:
|
|
case MOUNT_REMOUNTING_SIGKILL:
|
|
case MOUNT_UNMOUNTING_SIGTERM:
|
|
case MOUNT_UNMOUNTING_SIGKILL:
|
|
case MOUNT_FAILED:
|
|
if (old_state != state)
|
|
automount_send_ready(a, a->expire_tokens, -ENODEV);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
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 *expire_thread(void *p) {
|
|
struct autofs_dev_ioctl param;
|
|
_cleanup_(expire_data_freep) struct expire_data *data = (struct expire_data*)p;
|
|
int r;
|
|
|
|
assert(data->dev_autofs_fd >= 0);
|
|
assert(data->ioctl_fd >= 0);
|
|
|
|
init_autofs_dev_ioctl(¶m);
|
|
param.ioctlfd = data->ioctl_fd;
|
|
|
|
do {
|
|
r = ioctl(data->dev_autofs_fd, AUTOFS_DEV_IOCTL_EXPIRE, ¶m);
|
|
} while (r >= 0);
|
|
|
|
if (errno != EAGAIN)
|
|
log_warning_errno(errno, "Failed to expire automount, ignoring: %m");
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int automount_dispatch_expire(sd_event_source *source, usec_t usec, void *userdata) {
|
|
Automount *a = AUTOMOUNT(userdata);
|
|
_cleanup_(expire_data_freep) struct expire_data *data = NULL;
|
|
int r;
|
|
|
|
assert(a);
|
|
assert(source == a->expire_event_source);
|
|
|
|
data = new0(struct expire_data, 1);
|
|
if (!data)
|
|
return log_oom();
|
|
|
|
data->ioctl_fd = -1;
|
|
|
|
data->dev_autofs_fd = fcntl(UNIT(a)->manager->dev_autofs_fd, F_DUPFD_CLOEXEC, 3);
|
|
if (data->dev_autofs_fd < 0)
|
|
return log_unit_error_errno(UNIT(a), errno, "Failed to duplicate autofs fd: %m");
|
|
|
|
data->ioctl_fd = open_ioctl_fd(UNIT(a)->manager->dev_autofs_fd, a->where, a->dev_id);
|
|
if (data->ioctl_fd < 0)
|
|
return log_unit_error_errno(UNIT(a), data->ioctl_fd, "Couldn't open autofs ioctl fd: %m");
|
|
|
|
r = asynchronous_job(expire_thread, data);
|
|
if (r < 0)
|
|
return log_unit_error_errno(UNIT(a), r, "Failed to start expire job: %m");
|
|
|
|
data = NULL;
|
|
|
|
return automount_start_expire(a);
|
|
}
|
|
|
|
static int automount_start_expire(Automount *a) {
|
|
int r;
|
|
usec_t timeout;
|
|
|
|
assert(a);
|
|
|
|
if (a->timeout_idle_usec == 0)
|
|
return 0;
|
|
|
|
timeout = now(CLOCK_MONOTONIC) + MAX(a->timeout_idle_usec/3, USEC_PER_SEC);
|
|
|
|
if (a->expire_event_source) {
|
|
r = sd_event_source_set_time(a->expire_event_source, timeout);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return sd_event_source_set_enabled(a->expire_event_source, SD_EVENT_ONESHOT);
|
|
}
|
|
|
|
r = sd_event_add_time(
|
|
UNIT(a)->manager->event,
|
|
&a->expire_event_source,
|
|
CLOCK_MONOTONIC, timeout, 0,
|
|
automount_dispatch_expire, a);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
(void) sd_event_source_set_description(a->expire_event_source, "automount-expire");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void automount_enter_runnning(Automount *a) {
|
|
_cleanup_(sd_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_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;
|
|
}
|
|
|
|
if (!S_ISDIR(st.st_mode) || st.st_dev != a->dev_id)
|
|
log_unit_info(UNIT(a), "Automount point already active?");
|
|
else {
|
|
Unit *trigger;
|
|
|
|
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 int automount_start(Unit *u) {
|
|
Automount *a = AUTOMOUNT(u);
|
|
Unit *trigger;
|
|
|
|
assert(a);
|
|
assert(a->state == AUTOMOUNT_DEAD || a->state == AUTOMOUNT_FAILED);
|
|
|
|
if (path_is_mount_point(a->where, 0) > 0) {
|
|
log_unit_error(u, "Path %s is already a mount point, refusing start.", a->where);
|
|
return -EEXIST;
|
|
}
|
|
|
|
trigger = UNIT_TRIGGER(u);
|
|
if (!trigger || trigger->load_state != UNIT_LOADED) {
|
|
log_unit_error(u, "Refusing to start, unit to trigger not loaded.");
|
|
return -ENOENT;
|
|
}
|
|
|
|
a->result = AUTOMOUNT_SUCCESS;
|
|
automount_enter_waiting(a);
|
|
return 1;
|
|
}
|
|
|
|
static int automount_stop(Unit *u) {
|
|
Automount *a = AUTOMOUNT(u);
|
|
|
|
assert(a);
|
|
assert(a->state == AUTOMOUNT_WAITING || a->state == AUTOMOUNT_RUNNING);
|
|
|
|
automount_enter_dead(a, AUTOMOUNT_SUCCESS);
|
|
return 1;
|
|
}
|
|
|
|
static int automount_serialize(Unit *u, FILE *f, FDSet *fds) {
|
|
Automount *a = AUTOMOUNT(u);
|
|
Iterator i;
|
|
void *p;
|
|
int r;
|
|
|
|
assert(a);
|
|
assert(f);
|
|
assert(fds);
|
|
|
|
unit_serialize_item(u, f, "state", automount_state_to_string(a->state));
|
|
unit_serialize_item(u, f, "result", automount_result_to_string(a->result));
|
|
unit_serialize_item_format(u, f, "dev-id", "%u", (unsigned) a->dev_id);
|
|
|
|
SET_FOREACH(p, a->tokens, i)
|
|
unit_serialize_item_format(u, f, "token", "%u", PTR_TO_UINT(p));
|
|
SET_FOREACH(p, a->expire_tokens, i)
|
|
unit_serialize_item_format(u, f, "expire-token", "%u", PTR_TO_UINT(p));
|
|
|
|
r = unit_serialize_item_fd(u, f, fds, "pipe-fd", a->pipe_fd);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int automount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
|
|
Automount *a = AUTOMOUNT(u);
|
|
int r;
|
|
|
|
assert(a);
|
|
assert(fds);
|
|
|
|
if (streq(key, "state")) {
|
|
AutomountState state;
|
|
|
|
state = automount_state_from_string(value);
|
|
if (state < 0)
|
|
log_unit_debug(u, "Failed to parse state value: %s", value);
|
|
else
|
|
a->deserialized_state = state;
|
|
} else if (streq(key, "result")) {
|
|
AutomountResult f;
|
|
|
|
f = automount_result_from_string(value);
|
|
if (f < 0)
|
|
log_unit_debug(u, "Failed to parse result value: %s", value);
|
|
else if (f != AUTOMOUNT_SUCCESS)
|
|
a->result = f;
|
|
|
|
} else if (streq(key, "dev-id")) {
|
|
unsigned d;
|
|
|
|
if (safe_atou(value, &d) < 0)
|
|
log_unit_debug(u, "Failed to parse dev-id value: %s", value);
|
|
else
|
|
a->dev_id = (unsigned) d;
|
|
} else if (streq(key, "token")) {
|
|
unsigned token;
|
|
|
|
if (safe_atou(value, &token) < 0)
|
|
log_unit_debug(u, "Failed to parse token value: %s", value);
|
|
else {
|
|
r = set_ensure_allocated(&a->tokens, NULL);
|
|
if (r < 0) {
|
|
log_oom();
|
|
return 0;
|
|
}
|
|
|
|
r = set_put(a->tokens, UINT_TO_PTR(token));
|
|
if (r < 0)
|
|
log_unit_error_errno(u, r, "Failed to add token to set: %m");
|
|
}
|
|
} else if (streq(key, "expire-token")) {
|
|
unsigned token;
|
|
|
|
if (safe_atou(value, &token) < 0)
|
|
log_unit_debug(u, "Failed to parse token value: %s", value);
|
|
else {
|
|
r = set_ensure_allocated(&a->expire_tokens, NULL);
|
|
if (r < 0) {
|
|
log_oom();
|
|
return 0;
|
|
}
|
|
|
|
r = set_put(a->expire_tokens, UINT_TO_PTR(token));
|
|
if (r < 0)
|
|
log_unit_error_errno(u, r, "Failed to add expire token to set: %m");
|
|
}
|
|
} else if (streq(key, "pipe-fd")) {
|
|
int fd;
|
|
|
|
if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
|
|
log_unit_debug(u, "Failed to parse pipe-fd value: %s", value);
|
|
else {
|
|
safe_close(a->pipe_fd);
|
|
a->pipe_fd = fdset_remove(fds, fd);
|
|
}
|
|
} else
|
|
log_unit_debug(u, "Unknown serialization key: %s", key);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static UnitActiveState automount_active_state(Unit *u) {
|
|
assert(u);
|
|
|
|
return state_translation_table[AUTOMOUNT(u)->state];
|
|
}
|
|
|
|
static const char *automount_sub_state_to_string(Unit *u) {
|
|
assert(u);
|
|
|
|
return automount_state_to_string(AUTOMOUNT(u)->state);
|
|
}
|
|
|
|
static bool automount_check_gc(Unit *u) {
|
|
assert(u);
|
|
|
|
if (!UNIT_TRIGGER(u))
|
|
return false;
|
|
|
|
return UNIT_VTABLE(UNIT_TRIGGER(u))->check_gc(UNIT_TRIGGER(u));
|
|
}
|
|
|
|
static int automount_dispatch_io(sd_event_source *s, int fd, uint32_t events, void *userdata) {
|
|
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
|
|
union autofs_v5_packet_union packet;
|
|
Automount *a = AUTOMOUNT(userdata);
|
|
struct stat st;
|
|
Unit *trigger;
|
|
int r;
|
|
|
|
assert(a);
|
|
assert(fd == a->pipe_fd);
|
|
|
|
if (events != EPOLLIN) {
|
|
log_unit_error(UNIT(a), "Got invalid poll event %"PRIu32" on pipe (fd=%d)", events, fd);
|
|
goto fail;
|
|
}
|
|
|
|
r = loop_read_exact(a->pipe_fd, &packet, sizeof(packet), true);
|
|
if (r < 0) {
|
|
log_unit_error_errno(UNIT(a), r, "Invalid read from pipe: %m");
|
|
goto fail;
|
|
}
|
|
|
|
switch (packet.hdr.type) {
|
|
|
|
case autofs_ptype_missing_direct:
|
|
|
|
if (packet.v5_packet.pid > 0) {
|
|
_cleanup_free_ char *p = NULL;
|
|
|
|
get_process_comm(packet.v5_packet.pid, &p);
|
|
log_unit_info(UNIT(a), "Got automount request for %s, triggered by %"PRIu32" (%s)", a->where, packet.v5_packet.pid, strna(p));
|
|
} else
|
|
log_unit_debug(UNIT(a), "Got direct mount request on %s", a->where);
|
|
|
|
r = set_ensure_allocated(&a->tokens, NULL);
|
|
if (r < 0) {
|
|
log_unit_error(UNIT(a), "Failed to allocate token set.");
|
|
goto fail;
|
|
}
|
|
|
|
r = set_put(a->tokens, UINT_TO_PTR(packet.v5_packet.wait_queue_token));
|
|
if (r < 0) {
|
|
log_unit_error_errno(UNIT(a), r, "Failed to remember token: %m");
|
|
goto fail;
|
|
}
|
|
|
|
automount_enter_runnning(a);
|
|
break;
|
|
|
|
case autofs_ptype_expire_direct:
|
|
log_unit_debug(UNIT(a), "Got direct umount request on %s", a->where);
|
|
|
|
(void) sd_event_source_set_enabled(a->expire_event_source, SD_EVENT_OFF);
|
|
|
|
r = set_ensure_allocated(&a->expire_tokens, NULL);
|
|
if (r < 0) {
|
|
log_unit_error(UNIT(a), "Failed to allocate token set.");
|
|
goto fail;
|
|
}
|
|
|
|
r = set_put(a->expire_tokens, UINT_TO_PTR(packet.v5_packet.wait_queue_token));
|
|
if (r < 0) {
|
|
log_unit_error_errno(UNIT(a), r, "Failed to remember token: %m");
|
|
goto fail;
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
if (!S_ISDIR(st.st_mode) || st.st_dev == a->dev_id) {
|
|
log_unit_info(UNIT(a), "Automount point already unmounted?");
|
|
automount_send_ready(a, a->expire_tokens, 0);
|
|
break;
|
|
}
|
|
|
|
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_STOP, trigger, JOB_REPLACE, &error, NULL);
|
|
if (r < 0) {
|
|
log_unit_warning(UNIT(a), "Failed to queue umount startup job: %s", bus_error_message(&error, r));
|
|
goto fail;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
log_unit_error(UNIT(a), "Received unknown automount request %i", packet.hdr.type);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
automount_enter_dead(a, AUTOMOUNT_FAILURE_RESOURCES);
|
|
return 0;
|
|
}
|
|
|
|
static void automount_shutdown(Manager *m) {
|
|
assert(m);
|
|
|
|
m->dev_autofs_fd = safe_close(m->dev_autofs_fd);
|
|
}
|
|
|
|
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 bool automount_supported(void) {
|
|
static int supported = -1;
|
|
|
|
if (supported < 0)
|
|
supported = access("/dev/autofs", F_OK) >= 0;
|
|
|
|
return supported;
|
|
}
|
|
|
|
static const char* const automount_result_table[_AUTOMOUNT_RESULT_MAX] = {
|
|
[AUTOMOUNT_SUCCESS] = "success",
|
|
[AUTOMOUNT_FAILURE_RESOURCES] = "resources"
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(automount_result, AutomountResult);
|
|
|
|
const UnitVTable automount_vtable = {
|
|
.object_size = sizeof(Automount),
|
|
|
|
.sections =
|
|
"Unit\0"
|
|
"Automount\0"
|
|
"Install\0",
|
|
|
|
.no_alias = true,
|
|
.no_instances = true,
|
|
|
|
.init = automount_init,
|
|
.load = automount_load,
|
|
.done = automount_done,
|
|
|
|
.coldplug = automount_coldplug,
|
|
|
|
.dump = automount_dump,
|
|
|
|
.start = automount_start,
|
|
.stop = automount_stop,
|
|
|
|
.serialize = automount_serialize,
|
|
.deserialize_item = automount_deserialize_item,
|
|
|
|
.active_state = automount_active_state,
|
|
.sub_state_to_string = automount_sub_state_to_string,
|
|
|
|
.check_gc = automount_check_gc,
|
|
|
|
.reset_failed = automount_reset_failed,
|
|
|
|
.bus_vtable = bus_automount_vtable,
|
|
|
|
.shutdown = automount_shutdown,
|
|
.supported = automount_supported,
|
|
|
|
.status_message_formats = {
|
|
.finished_start_job = {
|
|
[JOB_DONE] = "Set up automount %s.",
|
|
[JOB_FAILED] = "Failed to set up automount %s.",
|
|
},
|
|
.finished_stop_job = {
|
|
[JOB_DONE] = "Unset automount %s.",
|
|
[JOB_FAILED] = "Failed to unset automount %s.",
|
|
},
|
|
},
|
|
};
|