2205 lines
73 KiB
C
2205 lines
73 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <sys/epoll.h>
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#include "sd-messages.h"
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#include "alloc-util.h"
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#include "dbus-mount.h"
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#include "dbus-unit.h"
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#include "device.h"
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#include "exit-status.h"
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#include "format-util.h"
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#include "fstab-util.h"
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#include "libmount-util.h"
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#include "log.h"
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#include "manager.h"
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#include "mkdir.h"
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#include "mount-setup.h"
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#include "mount.h"
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#include "mountpoint-util.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "process-util.h"
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#include "serialize.h"
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#include "special.h"
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#include "string-table.h"
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#include "string-util.h"
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#include "strv.h"
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#include "unit-name.h"
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#include "unit.h"
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#define RETRY_UMOUNT_MAX 32
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static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
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[MOUNT_DEAD] = UNIT_INACTIVE,
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[MOUNT_MOUNTING] = UNIT_ACTIVATING,
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[MOUNT_MOUNTING_DONE] = UNIT_ACTIVATING,
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[MOUNT_MOUNTED] = UNIT_ACTIVE,
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[MOUNT_REMOUNTING] = UNIT_RELOADING,
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[MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
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[MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING,
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[MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING,
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[MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
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[MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
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[MOUNT_FAILED] = UNIT_FAILED,
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[MOUNT_CLEANING] = UNIT_MAINTENANCE,
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};
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static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
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static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
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static int mount_process_proc_self_mountinfo(Manager *m);
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static bool MOUNT_STATE_WITH_PROCESS(MountState state) {
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return IN_SET(state,
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MOUNT_MOUNTING,
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MOUNT_MOUNTING_DONE,
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MOUNT_REMOUNTING,
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MOUNT_REMOUNTING_SIGTERM,
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MOUNT_REMOUNTING_SIGKILL,
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MOUNT_UNMOUNTING,
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MOUNT_UNMOUNTING_SIGTERM,
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MOUNT_UNMOUNTING_SIGKILL,
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MOUNT_CLEANING);
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}
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static bool mount_is_automount(const MountParameters *p) {
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assert(p);
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return fstab_test_option(p->options,
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"comment=systemd.automount\0"
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"x-systemd.automount\0");
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}
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static bool mount_is_network(const MountParameters *p) {
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assert(p);
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if (fstab_test_option(p->options, "_netdev\0"))
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return true;
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if (p->fstype && fstype_is_network(p->fstype))
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return true;
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return false;
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}
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static bool mount_is_nofail(const Mount *m) {
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assert(m);
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if (!m->from_fragment)
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return false;
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return fstab_test_yes_no_option(m->parameters_fragment.options, "nofail\0" "fail\0");
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}
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static bool mount_is_loop(const MountParameters *p) {
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assert(p);
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if (fstab_test_option(p->options, "loop\0"))
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return true;
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return false;
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}
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static bool mount_is_bind(const MountParameters *p) {
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assert(p);
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if (fstab_test_option(p->options, "bind\0" "rbind\0"))
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return true;
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if (p->fstype && STR_IN_SET(p->fstype, "bind", "rbind"))
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return true;
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return false;
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}
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static bool mount_is_bound_to_device(const Mount *m) {
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const MountParameters *p;
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if (m->from_fragment)
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return true;
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p = &m->parameters_proc_self_mountinfo;
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return fstab_test_option(p->options, "x-systemd.device-bound\0");
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}
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static bool mount_needs_quota(const MountParameters *p) {
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assert(p);
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/* Quotas are not enabled on network filesystems, but we want them, for example, on storage connected via
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* iscsi. We hence don't use mount_is_network() here, as that would also return true for _netdev devices. */
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if (p->fstype && fstype_is_network(p->fstype))
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return false;
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if (mount_is_bind(p))
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return false;
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return fstab_test_option(p->options,
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"usrquota\0" "grpquota\0" "quota\0" "usrjquota\0" "grpjquota\0");
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}
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static void mount_init(Unit *u) {
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Mount *m = MOUNT(u);
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assert(u);
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assert(u->load_state == UNIT_STUB);
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m->timeout_usec = u->manager->default_timeout_start_usec;
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m->exec_context.std_output = u->manager->default_std_output;
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m->exec_context.std_error = u->manager->default_std_error;
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m->directory_mode = 0755;
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/* We need to make sure that /usr/bin/mount is always called
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* in the same process group as us, so that the autofs kernel
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* side doesn't send us another mount request while we are
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* already trying to comply its last one. */
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m->exec_context.same_pgrp = true;
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m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
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u->ignore_on_isolate = true;
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}
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static int mount_arm_timer(Mount *m, usec_t usec) {
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int r;
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assert(m);
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if (m->timer_event_source) {
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r = sd_event_source_set_time(m->timer_event_source, usec);
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if (r < 0)
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return r;
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return sd_event_source_set_enabled(m->timer_event_source, SD_EVENT_ONESHOT);
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}
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if (usec == USEC_INFINITY)
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return 0;
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r = sd_event_add_time(
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UNIT(m)->manager->event,
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&m->timer_event_source,
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CLOCK_MONOTONIC,
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usec, 0,
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mount_dispatch_timer, m);
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if (r < 0)
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return r;
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(void) sd_event_source_set_description(m->timer_event_source, "mount-timer");
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return 0;
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}
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static void mount_unwatch_control_pid(Mount *m) {
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assert(m);
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if (m->control_pid <= 0)
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return;
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unit_unwatch_pid(UNIT(m), m->control_pid);
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m->control_pid = 0;
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}
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static void mount_parameters_done(MountParameters *p) {
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assert(p);
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p->what = mfree(p->what);
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p->options = mfree(p->options);
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p->fstype = mfree(p->fstype);
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}
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static void mount_done(Unit *u) {
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Mount *m = MOUNT(u);
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assert(m);
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m->where = mfree(m->where);
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mount_parameters_done(&m->parameters_proc_self_mountinfo);
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mount_parameters_done(&m->parameters_fragment);
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m->exec_runtime = exec_runtime_unref(m->exec_runtime, false);
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exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
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m->control_command = NULL;
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dynamic_creds_unref(&m->dynamic_creds);
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mount_unwatch_control_pid(m);
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m->timer_event_source = sd_event_source_unref(m->timer_event_source);
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}
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static MountParameters* get_mount_parameters_fragment(Mount *m) {
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assert(m);
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if (m->from_fragment)
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return &m->parameters_fragment;
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return NULL;
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}
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static MountParameters* get_mount_parameters(Mount *m) {
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assert(m);
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if (m->from_proc_self_mountinfo)
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return &m->parameters_proc_self_mountinfo;
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return get_mount_parameters_fragment(m);
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}
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static int update_parameters_proc_self_mountinfo(
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Mount *m,
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const char *what,
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const char *options,
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const char *fstype) {
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MountParameters *p;
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int r, q, w;
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p = &m->parameters_proc_self_mountinfo;
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r = free_and_strdup(&p->what, what);
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if (r < 0)
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return r;
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q = free_and_strdup(&p->options, options);
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if (q < 0)
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return q;
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w = free_and_strdup(&p->fstype, fstype);
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if (w < 0)
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return w;
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return r > 0 || q > 0 || w > 0;
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}
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static int mount_add_mount_dependencies(Mount *m) {
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MountParameters *pm;
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Unit *other;
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Set *s;
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int r;
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assert(m);
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if (!path_equal(m->where, "/")) {
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_cleanup_free_ char *parent = NULL;
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/* Adds in links to other mount points that might lie further up in the hierarchy */
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parent = dirname_malloc(m->where);
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if (!parent)
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return -ENOMEM;
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r = unit_require_mounts_for(UNIT(m), parent, UNIT_DEPENDENCY_IMPLICIT);
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if (r < 0)
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return r;
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}
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/* Adds in dependencies to other mount points that might be needed for the source path (if this is a bind mount
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* or a loop mount) to be available. */
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pm = get_mount_parameters_fragment(m);
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if (pm && pm->what &&
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path_is_absolute(pm->what) &&
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(mount_is_bind(pm) || mount_is_loop(pm) || !mount_is_network(pm))) {
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r = unit_require_mounts_for(UNIT(m), pm->what, UNIT_DEPENDENCY_FILE);
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if (r < 0)
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return r;
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}
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/* Adds in dependencies to other units that use this path or paths further down in the hierarchy */
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s = manager_get_units_requiring_mounts_for(UNIT(m)->manager, m->where);
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SET_FOREACH(other, s) {
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if (other->load_state != UNIT_LOADED)
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continue;
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if (other == UNIT(m))
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continue;
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r = unit_add_dependency(other, UNIT_AFTER, UNIT(m), true, UNIT_DEPENDENCY_PATH);
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if (r < 0)
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return r;
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if (UNIT(m)->fragment_path) {
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/* If we have fragment configuration, then make this dependency required */
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r = unit_add_dependency(other, UNIT_REQUIRES, UNIT(m), true, UNIT_DEPENDENCY_PATH);
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if (r < 0)
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return r;
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}
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}
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return 0;
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}
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static int mount_add_device_dependencies(Mount *m) {
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UnitDependencyMask mask;
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MountParameters *p;
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UnitDependency dep;
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int r;
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assert(m);
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p = get_mount_parameters(m);
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if (!p)
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return 0;
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if (!p->what)
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return 0;
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if (mount_is_bind(p))
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return 0;
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if (!is_device_path(p->what))
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return 0;
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/* /dev/root is a really weird thing, it's not a real device, but just a path the kernel exports for
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* the root file system specified on the kernel command line. Ignore it here. */
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if (PATH_IN_SET(p->what, "/dev/root", "/dev/nfs"))
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return 0;
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if (path_equal(m->where, "/"))
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return 0;
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/* Mount units from /proc/self/mountinfo are not bound to devices by default since they're subject to
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* races when devices are unplugged. But the user can still force this dep with an appropriate option
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* (or udev property) so the mount units are automatically stopped when the device disappears
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* suddenly. */
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dep = mount_is_bound_to_device(m) ? UNIT_BINDS_TO : UNIT_REQUIRES;
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/* We always use 'what' from /proc/self/mountinfo if mounted */
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mask = m->from_proc_self_mountinfo ? UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT : UNIT_DEPENDENCY_FILE;
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r = unit_add_node_dependency(UNIT(m), p->what, dep, mask);
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if (r < 0)
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return r;
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return unit_add_blockdev_dependency(UNIT(m), p->what, mask);
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}
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static int mount_add_quota_dependencies(Mount *m) {
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UnitDependencyMask mask;
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MountParameters *p;
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int r;
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assert(m);
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if (!MANAGER_IS_SYSTEM(UNIT(m)->manager))
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return 0;
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p = get_mount_parameters_fragment(m);
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if (!p)
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return 0;
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if (!mount_needs_quota(p))
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return 0;
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mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT;
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r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, true, mask);
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if (r < 0)
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return r;
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r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, true, mask);
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if (r < 0)
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return r;
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return 0;
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}
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static bool mount_is_extrinsic(Unit *u) {
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MountParameters *p;
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Mount *m = MOUNT(u);
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assert(m);
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/* Returns true for all units that are "magic" and should be excluded from the usual
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* start-up and shutdown dependencies. We call them "extrinsic" here, as they are generally
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* mounted outside of the systemd dependency logic. We shouldn't attempt to manage them
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* ourselves but it's fine if the user operates on them with us. */
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/* We only automatically manage mounts if we are in system mode */
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if (MANAGER_IS_USER(u->manager))
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return true;
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p = get_mount_parameters(m);
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if (p && fstab_is_extrinsic(m->where, p->options))
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return true;
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return false;
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}
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static int mount_add_default_ordering_dependencies(
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Mount *m,
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MountParameters *p,
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UnitDependencyMask mask) {
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const char *after, *before, *e;
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int r;
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assert(m);
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e = path_startswith(m->where, "/sysroot");
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if (e && in_initrd()) {
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/* All mounts under /sysroot need to happen later, at initrd-fs.target time. IOW,
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* it's not technically part of the basic initrd filesystem itself, and so
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* shouldn't inherit the default Before=local-fs.target dependency. */
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after = NULL;
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before = isempty(e) ? SPECIAL_INITRD_ROOT_FS_TARGET : SPECIAL_INITRD_FS_TARGET;
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} else if (mount_is_network(p)) {
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after = SPECIAL_REMOTE_FS_PRE_TARGET;
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before = SPECIAL_REMOTE_FS_TARGET;
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} else {
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after = SPECIAL_LOCAL_FS_PRE_TARGET;
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before = SPECIAL_LOCAL_FS_TARGET;
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}
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if (!mount_is_nofail(m) && !mount_is_automount(p)) {
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r = unit_add_dependency_by_name(UNIT(m), UNIT_BEFORE, before, true, mask);
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if (r < 0)
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return r;
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}
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if (after) {
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r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, true, mask);
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if (r < 0)
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return r;
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}
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return unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS,
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SPECIAL_UMOUNT_TARGET, true, mask);
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}
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static int mount_add_default_dependencies(Mount *m) {
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UnitDependencyMask mask;
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MountParameters *p;
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int r;
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assert(m);
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if (!UNIT(m)->default_dependencies)
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return 0;
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/* We do not add any default dependencies to /, /usr or /run/initramfs/, since they are
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* guaranteed to stay mounted the whole time, since our system is on it. Also, don't
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* bother with anything mounted below virtual file systems, it's also going to be virtual,
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* and hence not worth the effort. */
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if (mount_is_extrinsic(UNIT(m)))
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return 0;
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p = get_mount_parameters(m);
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if (!p)
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return 0;
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mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_DEFAULT;
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r = mount_add_default_ordering_dependencies(m, p, mask);
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if (r < 0)
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return r;
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if (mount_is_network(p)) {
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/* We order ourselves after network.target. This is primarily useful at shutdown:
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* services that take down the network should order themselves before
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* network.target, so that they are shut down only after this mount unit is
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* stopped. */
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r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_NETWORK_TARGET, true, mask);
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if (r < 0)
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return r;
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/* We pull in network-online.target, and order ourselves after it. This is useful
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* at start-up to actively pull in tools that want to be started before we start
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* mounting network file systems, and whose purpose it is to delay this until the
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* network is "up". */
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r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_WANTS, UNIT_AFTER, SPECIAL_NETWORK_ONLINE_TARGET, true, mask);
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if (r < 0)
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return r;
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|
}
|
|
|
|
/* 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
|
|
* resulting from the ExecContext and such. */
|
|
|
|
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
|
|
* activated), in case data from /proc/self/mountinfo has changed. This means all code here needs to be ready
|
|
* to run with an already set up unit. */
|
|
|
|
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, false);
|
|
|
|
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
|
|
* kernel, because we need some things to be set up no matter what when the kernel establishes a mount and thus
|
|
* we need to update the state in our unit to track it. After all, consider that we don't allow changing the
|
|
* 'slice' field for a unit once it is active. */
|
|
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_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
|
|
* whenever we executed an operation, so that our internal state reflects what the kernel says again, after all
|
|
* ultimately we just mirror the kernel's internal state on 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);
|
|
|
|
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_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
|
|
}
|
|
|
|
static void mount_enter_mounting(Mount *m) {
|
|
int r;
|
|
MountParameters *p;
|
|
|
|
assert(m);
|
|
|
|
r = unit_fail_if_noncanonical(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);
|
|
unit_warn_leftover_processes(UNIT(m), unit_log_leftover_process_start);
|
|
|
|
m->control_command_id = MOUNT_EXEC_MOUNT;
|
|
m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
|
|
|
|
/* Create the source directory for bind-mounts if needed */
|
|
p = get_mount_parameters_fragment(m);
|
|
if (p && mount_is_bind(p)) {
|
|
r = mkdir_p_label(p->what, m->directory_mode);
|
|
if (r < 0)
|
|
log_unit_error_errno(UNIT(m), r, "Failed to make bind mount source '%s': %m", p->what);
|
|
}
|
|
|
|
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 && m->read_write_only)
|
|
r = exec_command_append(m->control_command, "-w", 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_or_mounted(m, MOUNT_FAILURE_RESOURCES);
|
|
}
|
|
|
|
static void mount_set_reload_result(Mount *m, MountResult result) {
|
|
assert(m);
|
|
|
|
/* Only store the first error we encounter */
|
|
if (m->reload_result != MOUNT_SUCCESS)
|
|
return;
|
|
|
|
m->reload_result = result;
|
|
}
|
|
|
|
static void mount_enter_remounting(Mount *m) {
|
|
int r;
|
|
MountParameters *p;
|
|
|
|
assert(m);
|
|
|
|
/* Reset reload result when we are about to start a new remount operation */
|
|
m->reload_result = MOUNT_SUCCESS;
|
|
|
|
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 && m->read_write_only)
|
|
r = exec_command_append(m->control_command, "-w", 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");
|
|
mount_set_reload_result(m, MOUNT_FAILURE_RESOURCES);
|
|
mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
|
|
}
|
|
|
|
static void mount_cycle_clear(Mount *m) {
|
|
assert(m);
|
|
|
|
/* Clear all state we shall forget for this new cycle */
|
|
|
|
m->result = MOUNT_SUCCESS;
|
|
m->reload_result = MOUNT_SUCCESS;
|
|
exec_command_reset_status_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
|
|
UNIT(m)->reset_accounting = true;
|
|
}
|
|
|
|
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 (IN_SET(m->state,
|
|
MOUNT_UNMOUNTING,
|
|
MOUNT_UNMOUNTING_SIGTERM,
|
|
MOUNT_UNMOUNTING_SIGKILL,
|
|
MOUNT_CLEANING))
|
|
return -EAGAIN;
|
|
|
|
/* Already on it! */
|
|
if (IN_SET(m->state, MOUNT_MOUNTING, MOUNT_MOUNTING_DONE))
|
|
return 0;
|
|
|
|
assert(IN_SET(m->state, MOUNT_DEAD, MOUNT_FAILED));
|
|
|
|
r = unit_test_start_limit(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;
|
|
|
|
mount_cycle_clear(m);
|
|
mount_enter_mounting(m);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int mount_stop(Unit *u) {
|
|
Mount *m = MOUNT(u);
|
|
|
|
assert(m);
|
|
|
|
switch (m->state) {
|
|
|
|
case MOUNT_UNMOUNTING:
|
|
case MOUNT_UNMOUNTING_SIGKILL:
|
|
case MOUNT_UNMOUNTING_SIGTERM:
|
|
/* Already on it */
|
|
return 0;
|
|
|
|
case MOUNT_MOUNTING:
|
|
case MOUNT_MOUNTING_DONE:
|
|
case MOUNT_REMOUNTING:
|
|
/* If we are still waiting for /bin/mount, we go directly into kill mode. */
|
|
mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_SUCCESS);
|
|
return 0;
|
|
|
|
case MOUNT_REMOUNTING_SIGTERM:
|
|
/* If we are already waiting for a hung remount, convert this to the matching unmounting state */
|
|
mount_set_state(m, MOUNT_UNMOUNTING_SIGTERM);
|
|
return 0;
|
|
|
|
case MOUNT_REMOUNTING_SIGKILL:
|
|
/* as above */
|
|
mount_set_state(m, MOUNT_UNMOUNTING_SIGKILL);
|
|
return 0;
|
|
|
|
case MOUNT_MOUNTED:
|
|
mount_enter_unmounting(m);
|
|
return 1;
|
|
|
|
case MOUNT_CLEANING:
|
|
/* If we are currently cleaning, then abort it, brutally. */
|
|
mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS);
|
|
return 0;
|
|
|
|
default:
|
|
assert_not_reached("Unexpected state.");
|
|
}
|
|
}
|
|
|
|
static int mount_reload(Unit *u) {
|
|
Mount *m = MOUNT(u);
|
|
|
|
assert(m);
|
|
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);
|
|
|
|
(void) serialize_item(f, "state", mount_state_to_string(m->state));
|
|
(void) serialize_item(f, "result", mount_result_to_string(m->result));
|
|
(void) serialize_item(f, "reload-result", mount_result_to_string(m->reload_result));
|
|
(void) serialize_item_format(f, "n-retry-umount", "%u", m->n_retry_umount);
|
|
|
|
if (m->control_pid > 0)
|
|
(void) serialize_item_format(f, "control-pid", PID_FMT, m->control_pid);
|
|
|
|
if (m->control_command_id >= 0)
|
|
(void) serialize_item(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);
|
|
int r;
|
|
|
|
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, "n-retry-umount")) {
|
|
|
|
r = safe_atou(value, &m->n_retry_umount);
|
|
if (r < 0)
|
|
log_unit_debug(u, "Failed to parse n-retry-umount value: %s", value);
|
|
|
|
} else if (streq(key, "control-pid")) {
|
|
|
|
if (parse_pid(value, &m->control_pid) < 0)
|
|
log_unit_debug(u, "Failed to parse control-pid value: %s", value);
|
|
|
|
} 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_may_gc(Unit *u) {
|
|
Mount *m = MOUNT(u);
|
|
|
|
assert(m);
|
|
|
|
if (m->from_proc_self_mountinfo)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
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;
|
|
|
|
/* So here's the thing, we really want to know before /usr/bin/mount or /usr/bin/umount exit whether
|
|
* they established/remove a mount. This is important when mounting, but even more so when unmounting
|
|
* since we need to deal with nested mounts and otherwise cannot safely determine whether to repeat
|
|
* the unmounts. In theory, the kernel fires /proc/self/mountinfo changes off before returning from
|
|
* the mount() or umount() syscalls, and thus we should see the changes to the proc file before we
|
|
* process the waitid() for the /usr/bin/(u)mount processes. However, this is unfortunately racy: we
|
|
* have to waitid() for processes using P_ALL (since we need to reap unexpected children that got
|
|
* reparented to PID 1), but when using P_ALL we might end up reaping processes that terminated just
|
|
* instants ago, i.e. already after our last event loop iteration (i.e. after the last point we might
|
|
* have noticed /proc/self/mountinfo events via epoll). This means event loop priorities for
|
|
* processing SIGCHLD vs. /proc/self/mountinfo IO events are not as relevant as we want. To fix that
|
|
* race, let's explicitly scan /proc/self/mountinfo before we start processing /usr/bin/(u)mount
|
|
* dying. It's ugly, but it makes our ordering systematic again, and makes sure we always see
|
|
* /proc/self/mountinfo changes before our mount/umount exits. */
|
|
(void) mount_process_proc_self_mountinfo(u->manager);
|
|
|
|
m->control_pid = 0;
|
|
|
|
if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, 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 (IN_SET(m->state, MOUNT_REMOUNTING, MOUNT_REMOUNTING_SIGKILL, MOUNT_REMOUNTING_SIGTERM))
|
|
mount_set_reload_result(m, f);
|
|
else 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;
|
|
}
|
|
|
|
unit_log_process_exit(
|
|
u,
|
|
"Mount process",
|
|
mount_exec_command_to_string(m->control_command_id),
|
|
f == MOUNT_SUCCESS,
|
|
code, status);
|
|
|
|
/* 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. */
|
|
|
|
switch (m->state) {
|
|
|
|
case MOUNT_MOUNTING:
|
|
/* Our mount point has not appeared in mountinfo. Something went wrong. */
|
|
|
|
if (f == MOUNT_SUCCESS) {
|
|
/* Either /bin/mount has an unexpected definition of success,
|
|
* or someone raced us and we lost. */
|
|
log_unit_warning(UNIT(m), "Mount process finished, but there is no mount.");
|
|
f = MOUNT_FAILURE_PROTOCOL;
|
|
}
|
|
mount_enter_dead(m, f);
|
|
break;
|
|
|
|
case MOUNT_MOUNTING_DONE:
|
|
mount_enter_mounted(m, f);
|
|
break;
|
|
|
|
case MOUNT_REMOUNTING:
|
|
case MOUNT_REMOUNTING_SIGTERM:
|
|
case MOUNT_REMOUNTING_SIGKILL:
|
|
mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
|
|
break;
|
|
|
|
case MOUNT_UNMOUNTING:
|
|
|
|
if (f == MOUNT_SUCCESS && 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. We might exceed the timeout specified by the user overall,
|
|
* but we will stop as soon as any one umount times out. */
|
|
|
|
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_warning(u, "Mount still present after %u attempts to unmount, giving up.", m->n_retry_umount);
|
|
mount_enter_mounted(m, f);
|
|
}
|
|
} else
|
|
mount_enter_dead_or_mounted(m, f);
|
|
|
|
break;
|
|
|
|
case MOUNT_UNMOUNTING_SIGKILL:
|
|
case MOUNT_UNMOUNTING_SIGTERM:
|
|
mount_enter_dead_or_mounted(m, f);
|
|
break;
|
|
|
|
case MOUNT_CLEANING:
|
|
if (m->clean_result == MOUNT_SUCCESS)
|
|
m->clean_result = f;
|
|
|
|
mount_enter_dead(m, MOUNT_SUCCESS);
|
|
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. Terminating.");
|
|
mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
|
|
break;
|
|
|
|
case MOUNT_REMOUNTING:
|
|
log_unit_warning(UNIT(m), "Remounting timed out. Terminating remount process.");
|
|
mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
|
|
mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, MOUNT_SUCCESS);
|
|
break;
|
|
|
|
case MOUNT_REMOUNTING_SIGTERM:
|
|
mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
|
|
|
|
if (m->kill_context.send_sigkill) {
|
|
log_unit_warning(UNIT(m), "Remounting timed out. Killing.");
|
|
mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
|
|
} else {
|
|
log_unit_warning(UNIT(m), "Remounting timed out. Skipping SIGKILL. Ignoring.");
|
|
mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
|
|
}
|
|
break;
|
|
|
|
case MOUNT_REMOUNTING_SIGKILL:
|
|
mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
|
|
|
|
log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
|
|
mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
|
|
break;
|
|
|
|
case MOUNT_UNMOUNTING:
|
|
log_unit_warning(UNIT(m), "Unmounting timed out. Terminating.");
|
|
mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
|
|
break;
|
|
|
|
case MOUNT_UNMOUNTING_SIGTERM:
|
|
if (m->kill_context.send_sigkill) {
|
|
log_unit_warning(UNIT(m), "Mount process timed out. Killing.");
|
|
mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
|
|
} else {
|
|
log_unit_warning(UNIT(m), "Mount process timed out. Skipping SIGKILL. Ignoring.");
|
|
mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
|
|
}
|
|
break;
|
|
|
|
case MOUNT_UNMOUNTING_SIGKILL:
|
|
log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
|
|
mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
|
|
break;
|
|
|
|
case MOUNT_CLEANING:
|
|
log_unit_warning(UNIT(m), "Cleaning timed out. killing.");
|
|
|
|
if (m->clean_result == MOUNT_SUCCESS)
|
|
m->clean_result = MOUNT_FAILURE_TIMEOUT;
|
|
|
|
mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, 0);
|
|
break;
|
|
|
|
default:
|
|
assert_not_reached("Timeout at wrong time.");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mount_setup_new_unit(
|
|
Manager *m,
|
|
const char *name,
|
|
const char *what,
|
|
const char *where,
|
|
const char *options,
|
|
const char *fstype,
|
|
MountProcFlags *ret_flags,
|
|
Unit **ret) {
|
|
|
|
_cleanup_(unit_freep) Unit *u = NULL;
|
|
int r;
|
|
|
|
assert(m);
|
|
assert(name);
|
|
assert(ret_flags);
|
|
assert(ret);
|
|
|
|
r = unit_new_for_name(m, sizeof(Mount), name, &u);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = free_and_strdup(&u->source_path, "/proc/self/mountinfo");
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = free_and_strdup(&MOUNT(u)->where, where);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = update_parameters_proc_self_mountinfo(MOUNT(u), what, options, fstype);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* This unit was generated because /proc/self/mountinfo reported it. Remember this, so that by the time we load
|
|
* the unit file for it (and thus add in extra deps right after) we know what source to attributes the deps
|
|
* to.*/
|
|
MOUNT(u)->from_proc_self_mountinfo = true;
|
|
|
|
/* We have only allocated the stub now, let's enqueue this unit for loading now, so that everything else is
|
|
* loaded in now. */
|
|
unit_add_to_load_queue(u);
|
|
|
|
*ret_flags = MOUNT_PROC_IS_MOUNTED | MOUNT_PROC_JUST_MOUNTED | MOUNT_PROC_JUST_CHANGED;
|
|
*ret = TAKE_PTR(u);
|
|
return 0;
|
|
}
|
|
|
|
static int mount_setup_existing_unit(
|
|
Unit *u,
|
|
const char *what,
|
|
const char *where,
|
|
const char *options,
|
|
const char *fstype,
|
|
MountProcFlags *ret_flags) {
|
|
|
|
int r;
|
|
|
|
assert(u);
|
|
assert(ret_flags);
|
|
|
|
if (!MOUNT(u)->where) {
|
|
MOUNT(u)->where = strdup(where);
|
|
if (!MOUNT(u)->where)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* In case we have multiple mounts established on the same mount point, let's merge flags set already
|
|
* for the current unit. Note that the flags field is reset on each iteration of reading
|
|
* /proc/self/mountinfo, hence we know for sure anything already set here is from the current
|
|
* iteration and thus worthy of taking into account. */
|
|
MountProcFlags flags =
|
|
MOUNT(u)->proc_flags | MOUNT_PROC_IS_MOUNTED;
|
|
|
|
r = update_parameters_proc_self_mountinfo(MOUNT(u), what, options, fstype);
|
|
if (r < 0)
|
|
return r;
|
|
if (r > 0)
|
|
flags |= MOUNT_PROC_JUST_CHANGED;
|
|
|
|
/* There are two conditions when we consider a mount point just mounted: when we haven't seen it in
|
|
* /proc/self/mountinfo before or when MOUNT_MOUNTING is our current state. Why bother with the
|
|
* latter? Shouldn't that be covered by the former? No, during reload it is not because we might then
|
|
* encounter a new /proc/self/mountinfo in combination with an old mount unit state (since it stems
|
|
* from the serialized state), and need to catch up. Since we know that the MOUNT_MOUNTING state is
|
|
* reached when we wait for the mount to appear we hence can assume that if we are in it, we are
|
|
* actually seeing it established for the first time. */
|
|
if (!MOUNT(u)->from_proc_self_mountinfo || MOUNT(u)->state == MOUNT_MOUNTING)
|
|
flags |= MOUNT_PROC_JUST_MOUNTED;
|
|
|
|
MOUNT(u)->from_proc_self_mountinfo = true;
|
|
|
|
if (IN_SET(u->load_state, UNIT_NOT_FOUND, UNIT_BAD_SETTING, UNIT_ERROR)) {
|
|
/* The unit was previously not found or otherwise not loaded. Now that the unit shows up in
|
|
* /proc/self/mountinfo we should reconsider it this, hence set it to UNIT_LOADED. */
|
|
u->load_state = UNIT_LOADED;
|
|
u->load_error = 0;
|
|
|
|
flags |= MOUNT_PROC_JUST_CHANGED;
|
|
}
|
|
|
|
if (FLAGS_SET(flags, MOUNT_PROC_JUST_CHANGED)) {
|
|
/* If things changed, then make sure that all deps are regenerated. Let's
|
|
* first remove all automatic deps, and then add in the new ones. */
|
|
|
|
unit_remove_dependencies(u, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
|
|
|
|
r = mount_add_non_exec_dependencies(MOUNT(u));
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
*ret_flags = flags;
|
|
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;
|
|
MountProcFlags flags;
|
|
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;
|
|
|
|
/* Mount unit names have to be (like all other unit names) short enough to fit into file names. This
|
|
* means there's a good chance that overly long mount point paths after mangling them to look like a
|
|
* unit name would result in unit names we don't actually consider valid. This should be OK however
|
|
* as such long mount point paths should not happen on regular systems — and if they appear
|
|
* nonetheless they are generally synthesized by software, and thus managed by that other
|
|
* software. Having such long names just means you cannot use systemd to manage those specific mount
|
|
* points, which should be an OK restriction to make. After all we don't have to be able to manage
|
|
* all mount points in the world — as long as we don't choke on them when we encounter them. */
|
|
r = unit_name_from_path(where, ".mount", &e);
|
|
if (r < 0) {
|
|
static RateLimit rate_limit = { /* Let's log about this at warning level at most once every
|
|
* 5s. Given that we generate this whenever we read the file
|
|
* otherwise we probably shouldn't flood the logs with
|
|
* this */
|
|
.interval = 5 * USEC_PER_SEC,
|
|
.burst = 1,
|
|
};
|
|
|
|
return log_struct_errno(
|
|
ratelimit_below(&rate_limit) ? LOG_WARNING : LOG_DEBUG, r,
|
|
"MESSAGE_ID=" SD_MESSAGE_MOUNT_POINT_PATH_NOT_SUITABLE_STR,
|
|
"MOUNT_POINT=%s", where,
|
|
LOG_MESSAGE("Failed to generate valid unit name from path '%s', ignoring mount point: %m", where));
|
|
}
|
|
|
|
u = manager_get_unit(m, e);
|
|
if (u)
|
|
r = mount_setup_existing_unit(u, what, where, options, fstype, &flags);
|
|
else
|
|
/* First time we see this mount point meaning that it's not been initiated by a mount unit but rather
|
|
* by the sysadmin having called mount(8) directly. */
|
|
r = mount_setup_new_unit(m, e, what, where, options, fstype, &flags, &u);
|
|
if (r < 0)
|
|
return log_warning_errno(r, "Failed to set up mount unit for '%s': %m", where);
|
|
|
|
/* If the mount changed properties or state, let's notify our clients */
|
|
if (flags & (MOUNT_PROC_JUST_CHANGED|MOUNT_PROC_JUST_MOUNTED))
|
|
unit_add_to_dbus_queue(u);
|
|
|
|
if (set_flags)
|
|
MOUNT(u)->proc_flags = flags;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
|
|
_cleanup_(mnt_free_tablep) struct libmnt_table *table = NULL;
|
|
_cleanup_(mnt_free_iterp) struct libmnt_iter *iter = NULL;
|
|
int r;
|
|
|
|
assert(m);
|
|
|
|
r = libmount_parse(NULL, NULL, &table, &iter);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to parse /proc/self/mountinfo: %m");
|
|
|
|
for (;;) {
|
|
struct libmnt_fs *fs;
|
|
const char *device, *path, *options, *fstype;
|
|
|
|
r = mnt_table_next_fs(table, iter, &fs);
|
|
if (r == 1)
|
|
break;
|
|
if (r < 0)
|
|
return log_error_errno(r, "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;
|
|
|
|
device_found_node(m, device, DEVICE_FOUND_MOUNT, DEVICE_FOUND_MOUNT);
|
|
|
|
(void) mount_setup_unit(m, device, path, options, fstype, set_flags);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
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_perpetual(Manager *m) {
|
|
Unit *u;
|
|
int r;
|
|
|
|
assert(m);
|
|
|
|
/* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's
|
|
* unconditionally synthesize it here and mark it as perpetual. */
|
|
|
|
u = manager_get_unit(m, SPECIAL_ROOT_MOUNT);
|
|
if (!u) {
|
|
r = unit_new_for_name(m, sizeof(Mount), SPECIAL_ROOT_MOUNT, &u);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to allocate the special " SPECIAL_ROOT_MOUNT " unit: %m");
|
|
return;
|
|
}
|
|
}
|
|
|
|
u->perpetual = true;
|
|
MOUNT(u)->deserialized_state = MOUNT_MOUNTED;
|
|
|
|
unit_add_to_load_queue(u);
|
|
unit_add_to_dbus_queue(u);
|
|
}
|
|
|
|
static bool mount_is_mounted(Mount *m) {
|
|
assert(m);
|
|
|
|
return UNIT(m)->perpetual || FLAGS_SET(m->proc_flags, MOUNT_PROC_IS_MOUNTED);
|
|
}
|
|
|
|
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, SD_EVENT_PRIORITY_NORMAL-10);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to adjust mount watch priority: %m");
|
|
goto fail;
|
|
}
|
|
|
|
r = sd_event_source_set_ratelimit(m->mount_event_source, 1 * USEC_PER_SEC, 5);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to enable rate limit for mount events: %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 drain_libmount(Manager *m) {
|
|
bool rescan = false;
|
|
int r;
|
|
|
|
assert(m);
|
|
|
|
/* 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: r == 1 */
|
|
do {
|
|
r = mnt_monitor_next_change(m->mount_monitor, NULL, NULL);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to drain libmount events: %m");
|
|
if (r == 0)
|
|
rescan = true;
|
|
} while (r == 0);
|
|
|
|
return rescan;
|
|
}
|
|
|
|
static int mount_process_proc_self_mountinfo(Manager *m) {
|
|
_cleanup_set_free_free_ Set *around = NULL, *gone = NULL;
|
|
const char *what;
|
|
Unit *u;
|
|
int r;
|
|
|
|
assert(m);
|
|
|
|
r = drain_libmount(m);
|
|
if (r <= 0)
|
|
return r;
|
|
|
|
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(u)->proc_flags = 0;
|
|
|
|
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(mount)) {
|
|
|
|
/* 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, &path_hash_ops) < 0 ||
|
|
set_put_strdup(&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;
|
|
assert_se(update_parameters_proc_self_mountinfo(mount, NULL, NULL, NULL) >= 0);
|
|
|
|
switch (mount->state) {
|
|
|
|
case MOUNT_MOUNTED:
|
|
/* This has just been unmounted by somebody else, follow the state change. */
|
|
mount_enter_dead(mount, MOUNT_SUCCESS);
|
|
break;
|
|
|
|
case MOUNT_MOUNTING_DONE:
|
|
/* The mount command may add the corresponding proc mountinfo entry and
|
|
* then remove it because of an internal error. E.g., fuse.sshfs seems
|
|
* to do that when the connection fails. See #17617. To handle such the
|
|
* case, let's once set the state back to mounting. Then, the unit can
|
|
* correctly enter the failed state later in mount_sigchld(). */
|
|
mount_set_state(mount, MOUNT_MOUNTING);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
} else if (mount->proc_flags & (MOUNT_PROC_JUST_MOUNTED|MOUNT_PROC_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(u);
|
|
mount_cycle_clear(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) &&
|
|
mount->from_proc_self_mountinfo &&
|
|
mount->parameters_proc_self_mountinfo.what) {
|
|
/* Track devices currently used */
|
|
|
|
if (set_ensure_allocated(&around, &path_hash_ops) < 0 ||
|
|
set_put_strdup(&around, mount->parameters_proc_self_mountinfo.what) < 0)
|
|
log_oom();
|
|
}
|
|
|
|
/* Reset the flags for later calls */
|
|
mount->proc_flags = 0;
|
|
}
|
|
|
|
SET_FOREACH(what, gone) {
|
|
if (set_contains(around, what))
|
|
continue;
|
|
|
|
/* Let the device units know that the device is no longer mounted */
|
|
device_found_node(m, what, 0, DEVICE_FOUND_MOUNT);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
|
|
Manager *m = userdata;
|
|
|
|
assert(m);
|
|
assert(revents & EPOLLIN);
|
|
|
|
return mount_process_proc_self_mountinfo(m);
|
|
}
|
|
|
|
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;
|
|
m->clean_result = MOUNT_SUCCESS;
|
|
}
|
|
|
|
static int mount_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
|
|
Mount *m = MOUNT(u);
|
|
|
|
assert(m);
|
|
|
|
return unit_kill_common(u, who, signo, -1, m->control_pid, error);
|
|
}
|
|
|
|
static int mount_control_pid(Unit *u) {
|
|
Mount *m = MOUNT(u);
|
|
|
|
assert(m);
|
|
|
|
return m->control_pid;
|
|
}
|
|
|
|
static int mount_clean(Unit *u, ExecCleanMask mask) {
|
|
_cleanup_strv_free_ char **l = NULL;
|
|
Mount *m = MOUNT(u);
|
|
int r;
|
|
|
|
assert(m);
|
|
assert(mask != 0);
|
|
|
|
if (m->state != MOUNT_DEAD)
|
|
return -EBUSY;
|
|
|
|
r = exec_context_get_clean_directories(&m->exec_context, u->manager->prefix, mask, &l);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (strv_isempty(l))
|
|
return -EUNATCH;
|
|
|
|
mount_unwatch_control_pid(m);
|
|
m->clean_result = MOUNT_SUCCESS;
|
|
m->control_command = NULL;
|
|
m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
|
|
|
|
r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->exec_context.timeout_clean_usec));
|
|
if (r < 0)
|
|
goto fail;
|
|
|
|
r = unit_fork_and_watch_rm_rf(u, l, &m->control_pid);
|
|
if (r < 0)
|
|
goto fail;
|
|
|
|
mount_set_state(m, MOUNT_CLEANING);
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
log_unit_warning_errno(u, r, "Failed to initiate cleaning: %m");
|
|
m->clean_result = MOUNT_FAILURE_RESOURCES;
|
|
m->timer_event_source = sd_event_source_unref(m->timer_event_source);
|
|
return r;
|
|
}
|
|
|
|
static int mount_can_clean(Unit *u, ExecCleanMask *ret) {
|
|
Mount *m = MOUNT(u);
|
|
|
|
assert(m);
|
|
|
|
return exec_context_get_clean_mask(&m->exec_context, ret);
|
|
}
|
|
|
|
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",
|
|
[MOUNT_FAILURE_PROTOCOL] = "protocol",
|
|
};
|
|
|
|
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",
|
|
|
|
.can_transient = true,
|
|
.can_fail = true,
|
|
|
|
.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,
|
|
.clean = mount_clean,
|
|
.can_clean = mount_can_clean,
|
|
|
|
.serialize = mount_serialize,
|
|
.deserialize_item = mount_deserialize_item,
|
|
|
|
.active_state = mount_active_state,
|
|
.sub_state_to_string = mount_sub_state_to_string,
|
|
|
|
.will_restart = unit_will_restart_default,
|
|
|
|
.may_gc = mount_may_gc,
|
|
.is_extrinsic = mount_is_extrinsic,
|
|
|
|
.sigchld_event = mount_sigchld_event,
|
|
|
|
.reset_failed = mount_reset_failed,
|
|
|
|
.control_pid = mount_control_pid,
|
|
|
|
.bus_set_property = bus_mount_set_property,
|
|
.bus_commit_properties = bus_mount_commit_properties,
|
|
|
|
.get_timeout = mount_get_timeout,
|
|
|
|
.enumerate_perpetual = mount_enumerate_perpetual,
|
|
.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.",
|
|
},
|
|
},
|
|
};
|