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Systemd/src/core/mount.c
Lennart Poettering 4b58153dd2 core: add "invocation ID" concept to service manager 
This adds a new invocation ID concept to the service manager. The invocation ID
identifies each runtime cycle of a unit uniquely. A new randomized 128bit ID is
generated each time a unit moves from and inactive to an activating or active
state.

The primary usecase for this concept is to connect the runtime data PID 1
maintains about a service with the offline data the journal stores about it.
Previously we'd use the unit name plus start/stop times, which however is
highly racy since the journal will generally process log data after the service
already ended.

The "invocation ID" kinda matches the "boot ID" concept of the Linux kernel,
except that it applies to an individual unit instead of the whole system.

The invocation ID is passed to the activated processes as environment variable.
It is additionally stored as extended attribute on the cgroup of the unit. The
latter is used by journald to automatically retrieve it for each log logged
message and attach it to the log entry. The environment variable is very easily
accessible, even for unprivileged services. OTOH the extended attribute is only
accessible to privileged processes (this is because cgroupfs only supports the
"trusted." xattr namespace, not "user."). The environment variable may be
altered by services, the extended attribute may not be, hence is the better
choice for the journal.

Note that reading the invocation ID off the extended attribute from journald is
racy, similar to the way reading the unit name for a logging process is.

This patch adds APIs to read the invocation ID to sd-id128:
sd_id128_get_invocation() may be used in a similar fashion to
sd_id128_get_boot().

PID1's own logging is updated to always include the invocation ID when it logs
information about a unit.

A new bus call GetUnitByInvocationID() is added that allows retrieving a bus
path to a unit by its invocation ID. The bus path is built using the invocation
ID, thus providing a path for referring to a unit that is valid only for the
current runtime cycleof it.

Outlook for the future: should the kernel eventually allow passing of cgroup
information along AF_UNIX/SOCK_DGRAM messages via a unique cgroup id, then we
can alter the invocation ID to be generated as hash from that rather than
entirely randomly. This way we can derive the invocation race-freely from the
messages.
2016-10-07 20:14:38 +02:00

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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 "formats-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 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, 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;
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;
r = unit_add_node_link(UNIT(m), p->what, device_wants_mount, m->from_fragment ? UNIT_BINDS_TO : UNIT_REQUIRES);
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 should_umount(Mount *m) {
MountParameters *p;
if (PATH_IN_SET(m->where, "/", "/usr") ||
path_startswith(m->where, "/run/initramfs"))
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) {
MountParameters *p;
const char *after;
int r;
assert(m);
if (!UNIT(m)->default_dependencies)
return 0;
if (!MANAGER_IS_SYSTEM(UNIT(m)->manager))
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 (PATH_IN_SET(m->where, "/", "/usr") ||
path_startswith(m->where, "/run/initramfs") ||
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)) {
/* 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;
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;
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(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 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"
"%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, 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.flags |= UNIT(m)->manager->confirm_spawn ? EXEC_CONFIRM_SPAWN : 0;
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 (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 && 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);
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);
int r;
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);
r = unit_start_limit_test(u);
if (r < 0) {
mount_enter_dead(m, MOUNT_FAILURE_START_LIMIT_HIT);
return r;
}
r = unit_acquire_invocation_id(u);
if (r < 0)
return r;
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 (m->result == 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 (MANAGER_IS_SYSTEM(m)) {
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 (MANAGER_IS_SYSTEM(m) &&
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);
mnt_unref_monitor(m->mount_monitor);
m->mount_monitor = NULL;
}
static int mount_get_timeout(Unit *u, usec_t *timeout) {
Mount *m = MOUNT(u);
usec_t t;
int r;
if (!m->timer_event_source)
return 0;
r = sd_event_source_get_time(m->timer_event_source, &t);
if (r < 0)
return r;
if (t == USEC_INFINITY)
return 0;
*timeout = t;
return 1;
}
static void mount_enumerate(Manager *m) {
int r;
assert(m);
mnt_init_debug(0);
if (!m->mount_monitor) {
int fd;
m->mount_monitor = mnt_new_monitor();
if (!m->mount_monitor) {
log_oom();
goto fail;
}
r = mnt_monitor_enable_kernel(m->mount_monitor, 1);
if (r < 0) {
log_error_errno(r, "Failed to enable watching of kernel mount events: %m");
goto fail;
}
r = mnt_monitor_enable_userspace(m->mount_monitor, 1, NULL);
if (r < 0) {
log_error_errno(r, "Failed to enable watching of userspace mount events: %m");
goto fail;
}
/* mnt_unref_monitor() will close the fd */
fd = r = mnt_monitor_get_fd(m->mount_monitor);
if (r < 0) {
log_error_errno(r, "Failed to acquire watch file descriptor: %m");
goto fail;
}
r = sd_event_add_io(m->event, &m->mount_event_source, fd, EPOLLIN, mount_dispatch_io, m);
if (r < 0) {
log_error_errno(r, "Failed to watch mount file descriptor: %m");
goto fail;
}
r = sd_event_source_set_priority(m->mount_event_source, -10);
if (r < 0) {
log_error_errno(r, "Failed to adjust mount watch priority: %m");
goto fail;
}
(void) sd_event_source_set_description(m->mount_event_source, "mount-monitor-dispatch");
}
r = mount_load_proc_self_mountinfo(m, false);
if (r < 0)
goto fail;
return;
fail:
mount_shutdown(m);
}
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 & EPOLLIN);
if (fd == mnt_monitor_get_fd(m->mount_monitor)) {
bool rescan = false;
/* Drain all events and verify that the event is valid.
*
* Note that libmount also monitors /run/mount mkdir if the
* directory does not exist yet. The mkdir may generate event
* which is irrelevant for us.
*
* error: r < 0; valid: r == 0, false positive: rc == 1 */
do {
r = mnt_monitor_next_change(m->mount_monitor, NULL, NULL);
if (r == 0)
rescan = true;
else if (r < 0)
return log_error_errno(r, "Failed to drain libmount events");
} while (r == 0);
log_debug("libmount event [rescan: %s]", yes_no(rescan));
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->result = MOUNT_SUCCESS; /* make sure we forget any earlier umount failures */
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, but let's
* generate a new invocation ID for this implicitly and automatically. */
(void) unit_acquire_invocation_id(UNIT(mount));
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 int mount_control_pid(Unit *u) {
Mount *m = MOUNT(u);
assert(m);
return m->control_pid;
}
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",
[MOUNT_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
};
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),
.dynamic_creds_offset = offsetof(Mount, dynamic_creds),
.sections =
"Unit\0"
"Mount\0"
"Install\0",
.private_section = "Mount",
.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,
.control_pid = mount_control_pid,
.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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