diff options
Diffstat (limited to 'src/core/mount.c')
| -rw-r--r-- | src/core/mount.c | 2344 |
1 files changed, 2344 insertions, 0 deletions
diff --git a/src/core/mount.c b/src/core/mount.c new file mode 100644 index 0000000..82ff3a7 --- /dev/null +++ b/src/core/mount.c @@ -0,0 +1,2344 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <errno.h> +#include <signal.h> +#include <stdio.h> +#include <sys/epoll.h> + +#include "sd-messages.h" + +#include "alloc-util.h" +#include "dbus-mount.h" +#include "dbus-unit.h" +#include "device.h" +#include "exit-status.h" +#include "format-util.h" +#include "fs-util.h" +#include "fstab-util.h" +#include "libmount-util.h" +#include "log.h" +#include "manager.h" +#include "mkdir-label.h" +#include "mount-setup.h" +#include "mount.h" +#include "mountpoint-util.h" +#include "parse-util.h" +#include "path-util.h" +#include "process-util.h" +#include "serialize.h" +#include "special.h" +#include "stat-util.h" +#include "string-table.h" +#include "string-util.h" +#include "strv.h" +#include "unit-name.h" +#include "unit.h" + +#define RETRY_UMOUNT_MAX 32 + +static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = { + [MOUNT_DEAD] = UNIT_INACTIVE, + [MOUNT_MOUNTING] = UNIT_ACTIVATING, + [MOUNT_MOUNTING_DONE] = UNIT_ACTIVATING, + [MOUNT_MOUNTED] = UNIT_ACTIVE, + [MOUNT_REMOUNTING] = UNIT_RELOADING, + [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING, + [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING, + [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING, + [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING, + [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING, + [MOUNT_FAILED] = UNIT_FAILED, + [MOUNT_CLEANING] = UNIT_MAINTENANCE, +}; + +static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata); +static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); +static void mount_enter_dead(Mount *m, MountResult f); +static void mount_enter_mounted(Mount *m, MountResult f); +static void mount_cycle_clear(Mount *m); +static int mount_process_proc_self_mountinfo(Manager *m); + +static bool MOUNT_STATE_WITH_PROCESS(MountState state) { + return IN_SET(state, + MOUNT_MOUNTING, + MOUNT_MOUNTING_DONE, + MOUNT_REMOUNTING, + MOUNT_REMOUNTING_SIGTERM, + MOUNT_REMOUNTING_SIGKILL, + MOUNT_UNMOUNTING, + MOUNT_UNMOUNTING_SIGTERM, + MOUNT_UNMOUNTING_SIGKILL, + MOUNT_CLEANING); +} + +static MountParameters* get_mount_parameters_fragment(Mount *m) { + assert(m); + + if (m->from_fragment) + return &m->parameters_fragment; + + return NULL; +} + +static MountParameters* get_mount_parameters(Mount *m) { + assert(m); + + if (m->from_proc_self_mountinfo) + return &m->parameters_proc_self_mountinfo; + + return get_mount_parameters_fragment(m); +} + +static bool mount_is_network(const MountParameters *p) { + assert(p); + + if (fstab_test_option(p->options, "_netdev\0")) + return true; + + if (p->fstype && fstype_is_network(p->fstype)) + return true; + + return false; +} + +static bool mount_is_nofail(const Mount *m) { + assert(m); + + if (!m->from_fragment) + return false; + + return fstab_test_yes_no_option(m->parameters_fragment.options, "nofail\0" "fail\0"); +} + +static bool mount_is_loop(const MountParameters *p) { + assert(p); + + if (fstab_test_option(p->options, "loop\0")) + return true; + + return false; +} + +static bool mount_is_bind(const MountParameters *p) { + assert(p); + + if (fstab_test_option(p->options, "bind\0" "rbind\0")) + return true; + + if (p->fstype && STR_IN_SET(p->fstype, "bind", "rbind")) + return true; + + return false; +} + +static bool mount_is_bound_to_device(Mount *m) { + const MountParameters *p; + + assert(m); + + /* Determines whether to place a Requires= or BindsTo= dependency on the backing device unit. We do + * this by checking for the x-systemd.device-bound mount option. Iff it is set we use BindsTo=, + * otherwise Requires=. But note that we might combine the latter with StopPropagatedFrom=, see + * below. */ + + p = get_mount_parameters(m); + if (!p) + return false; + + return fstab_test_option(p->options, "x-systemd.device-bound\0"); +} + +static bool mount_propagate_stop(Mount *m) { + assert(m); + + if (mount_is_bound_to_device(m)) /* If we are using BindsTo= the stop propagation is implicit, no need to bother */ + return false; + + return m->from_fragment; /* let's propagate stop whenever this is an explicitly configured unit, + * otherwise let's not bother. */ +} + +static bool mount_needs_quota(const MountParameters *p) { + assert(p); + + if (p->fstype && !fstype_needs_quota(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(m); + assert(u); + assert(u->load_state == UNIT_STUB); + + m->timeout_usec = u->manager->default_timeout_start_usec; + + m->exec_context.std_output = u->manager->default_std_output; + m->exec_context.std_error = u->manager->default_std_error; + + m->directory_mode = 0755; + + /* We need to make sure that /usr/bin/mount is always called + * 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 (usec == USEC_INFINITY) + return sd_event_source_set_enabled(m->timer_event_source, SD_EVENT_OFF); + + 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); + } + + 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), TAKE_PID(m->control_pid)); +} + +static void mount_parameters_done(MountParameters *p) { + assert(p); + + p->what = mfree(p->what); + p->options = mfree(p->options); + p->fstype = mfree(p->fstype); +} + +static void mount_done(Unit *u) { + Mount *m = MOUNT(u); + + assert(m); + + m->where = mfree(m->where); + + mount_parameters_done(&m->parameters_proc_self_mountinfo); + mount_parameters_done(&m->parameters_fragment); + + m->exec_runtime = exec_runtime_unref(m->exec_runtime, false); + exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX); + m->control_command = NULL; + + dynamic_creds_unref(&m->dynamic_creds); + + mount_unwatch_control_pid(m); + + m->timer_event_source = sd_event_source_disable_unref(m->timer_event_source); +} + +static int update_parameters_proc_self_mountinfo( + Mount *m, + const char *what, + const char *options, + const char *fstype) { + + MountParameters *p; + int r, q, w; + + p = &m->parameters_proc_self_mountinfo; + + r = free_and_strdup(&p->what, what); + if (r < 0) + return r; + + q = free_and_strdup(&p->options, options); + if (q < 0) + return q; + + w = free_and_strdup(&p->fstype, fstype); + if (w < 0) + return w; + + return r > 0 || q > 0 || w > 0; +} + +static int mount_add_mount_dependencies(Mount *m) { + MountParameters *pm; + Unit *other; + Set *s; + int r; + + assert(m); + + if (!path_equal(m->where, "/")) { + _cleanup_free_ char *parent = NULL; + + /* Adds in links to other mount points that might lie further up in the hierarchy */ + + r = path_extract_directory(m->where, &parent); + if (r < 0) + return r; + + r = unit_require_mounts_for(UNIT(m), parent, UNIT_DEPENDENCY_IMPLICIT); + if (r < 0) + return r; + } + + /* Adds in dependencies to other mount points that might be needed for the source path (if this is a bind mount + * 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, UNIT_DEPENDENCY_FILE); + if (r < 0) + return r; + } + + /* Adds in dependencies to other units that use this path or paths further down in the hierarchy */ + s = manager_get_units_requiring_mounts_for(UNIT(m)->manager, m->where); + SET_FOREACH(other, s) { + + if (other->load_state != UNIT_LOADED) + continue; + + if (other == UNIT(m)) + continue; + + r = unit_add_dependency(other, UNIT_AFTER, UNIT(m), true, UNIT_DEPENDENCY_PATH); + if (r < 0) + return r; + + if (UNIT(m)->fragment_path) { + /* If we have fragment configuration, then make this dependency required */ + r = unit_add_dependency(other, UNIT_REQUIRES, UNIT(m), true, UNIT_DEPENDENCY_PATH); + if (r < 0) + return r; + } + } + + return 0; +} + +static int mount_add_device_dependencies(Mount *m) { + UnitDependencyMask mask; + MountParameters *p; + UnitDependency dep; + int r; + + assert(m); + + log_unit_trace(UNIT(m), "Processing implicit device dependencies"); + + p = get_mount_parameters(m); + if (!p) { + log_unit_trace(UNIT(m), "Missing mount parameters, skipping implicit device dependencies"); + return 0; + } + + if (!p->what) { + log_unit_trace(UNIT(m), "Missing mount source, skipping implicit device dependencies"); + return 0; + } + + if (mount_is_bind(p)) { + log_unit_trace(UNIT(m), "Mount unit is a bind mount, skipping implicit device dependencies"); + return 0; + } + + if (!is_device_path(p->what)) { + log_unit_trace(UNIT(m), "Mount source is not a device path, skipping implicit device dependencies"); + 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_IN_SET(p->what, "/dev/root", "/dev/nfs")) { + log_unit_trace(UNIT(m), "Mount source is in /dev/root or /dev/nfs, skipping implicit device dependencies"); + return 0; + } + + if (path_equal(m->where, "/")) { + log_unit_trace(UNIT(m), "Mount destination is '/', skipping implicit device dependencies"); + return 0; + } + + /* Mount units from /proc/self/mountinfo are not bound to devices by default since they're subject to + * races when mounts are established by other tools with different backing devices than what we + * maintain. The user can still force this to be a BindsTo= dependency with an appropriate option (or + * udev property) so the mount units are automatically stopped when the device disappears + * suddenly. */ + dep = mount_is_bound_to_device(m) ? UNIT_BINDS_TO : UNIT_REQUIRES; + + /* We always use 'what' from /proc/self/mountinfo if mounted */ + mask = m->from_proc_self_mountinfo ? UNIT_DEPENDENCY_MOUNTINFO : UNIT_DEPENDENCY_MOUNT_FILE; + + r = unit_add_node_dependency(UNIT(m), p->what, dep, mask); + if (r < 0) + return r; + if (r > 0) + log_unit_trace(UNIT(m), "Added %s dependency on %s", unit_dependency_to_string(dep), p->what); + + if (mount_propagate_stop(m)) { + r = unit_add_node_dependency(UNIT(m), p->what, UNIT_STOP_PROPAGATED_FROM, mask); + if (r < 0) + return r; + if (r > 0) + log_unit_trace(UNIT(m), "Added %s dependency on %s", + unit_dependency_to_string(UNIT_STOP_PROPAGATED_FROM), p->what); + } + + r = unit_add_blockdev_dependency(UNIT(m), p->what, mask); + if (r > 0) + log_unit_trace(UNIT(m), "Added %s dependency on %s", unit_dependency_to_string(UNIT_AFTER), p->what); + + return 0; +} + +static int mount_add_quota_dependencies(Mount *m) { + MountParameters *p; + int r; + + assert(m); + + if (!MANAGER_IS_SYSTEM(UNIT(m)->manager)) + return 0; + + p = get_mount_parameters_fragment(m); + if (!p) + return 0; + + if (!mount_needs_quota(p)) + return 0; + + r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, + /* add_reference= */ true, UNIT_DEPENDENCY_FILE); + if (r < 0) + return r; + + r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, + /* add_reference= */true, UNIT_DEPENDENCY_FILE); + if (r < 0) + return r; + + return 0; +} + +static bool mount_is_extrinsic(Unit *u) { + MountParameters *p; + Mount *m = MOUNT(u); + assert(m); + + /* Returns true for all units that are "magic" and should be excluded from the usual + * start-up and shutdown dependencies. We call them "extrinsic" here, as they are generally + * mounted outside of the systemd dependency logic. We shouldn't attempt to manage them + * ourselves but it's fine if the user operates on them with us. */ + + /* We only automatically manage mounts if we are in system mode */ + if (MANAGER_IS_USER(u->manager)) + return true; + + p = get_mount_parameters(m); + if (p && fstab_is_extrinsic(m->where, p->options)) + return true; + + return false; +} + +static int mount_add_default_ordering_dependencies(Mount *m, MountParameters *p, UnitDependencyMask mask) { + const char *after, *before, *e; + int r; + + assert(m); + + e = path_startswith(m->where, "/sysroot"); + if (e && in_initrd()) { + /* All mounts under /sysroot need to happen later, at initrd-fs.target time. IOW, + * it's not technically part of the basic initrd filesystem itself, and so + * shouldn't inherit the default Before=local-fs.target dependency. However, + * these mounts still need to start after local-fs-pre.target, as a sync point + * for things like systemd-hibernate-resume@.service that should start before + * any mounts. */ + + after = SPECIAL_LOCAL_FS_PRE_TARGET; + before = isempty(e) ? SPECIAL_INITRD_ROOT_FS_TARGET : SPECIAL_INITRD_FS_TARGET; + + } else if (in_initrd() && path_startswith(m->where, "/sysusr/usr")) { + after = SPECIAL_LOCAL_FS_PRE_TARGET; + before = SPECIAL_INITRD_USR_FS_TARGET; + + } else if (mount_is_network(p)) { + after = SPECIAL_REMOTE_FS_PRE_TARGET; + before = SPECIAL_REMOTE_FS_TARGET; + + } else { + after = SPECIAL_LOCAL_FS_PRE_TARGET; + before = SPECIAL_LOCAL_FS_TARGET; + } + + if (!mount_is_nofail(m)) { + r = unit_add_dependency_by_name(UNIT(m), UNIT_BEFORE, before, /* add_reference= */ true, mask); + if (r < 0) + return r; + } + + r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, /* add_reference= */ true, mask); + if (r < 0) + return r; + + return unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, + /* add_reference= */ true, mask); +} + +static int mount_add_default_dependencies(Mount *m) { + UnitDependencyMask mask; + MountParameters *p; + int r; + + assert(m); + + if (!UNIT(m)->default_dependencies) + return 0; + + /* We do not add any default dependencies to /, /usr or /run/initramfs/, since they are + * 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 (mount_is_extrinsic(UNIT(m))) + return 0; + + p = get_mount_parameters(m); + if (!p) + return 0; + + mask = m->from_proc_self_mountinfo ? UNIT_DEPENDENCY_MOUNTINFO : UNIT_DEPENDENCY_MOUNT_FILE; + + r = mount_add_default_ordering_dependencies(m, p, mask); + if (r < 0) + return r; + + if (mount_is_network(p)) { + /* We order ourselves after network.target. This is primarily useful at shutdown: + * 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, + /* add_reference= */ true, mask); + 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, + /* add_reference= */ true, mask); + if (r < 0) + return r; + } + + /* If this is a tmpfs mount then we have to unmount it before we try to deactivate swaps */ + if (streq_ptr(p->fstype, "tmpfs")) { + r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_SWAP_TARGET, + /* add_reference= */ 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); + + /* We may be called due to this mount appearing in /proc/self/mountinfo, hence we clear all existing + * dependencies that were initialized from the unit file but whose final value really depends on the + * content of /proc/self/mountinfo. Some (such as m->where) might have become stale now. */ + unit_remove_dependencies(UNIT(m), UNIT_DEPENDENCY_MOUNTINFO | UNIT_DEPENDENCY_MOUNT_FILE); + + if (!m->where) + return 0; + + /* 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 == -ENAMETOOLONG) + log_unit_error_errno(u, r, "Failed to derive mount point path from unit name, because unit name is hashed. " + "Set \"Where=\" in the unit file explicitly."); + if (r < 0) + return r; + } + + path_simplify(m->where); + + if (!u->description) { + r = unit_set_description(u, m->where); + if (r < 0) + return r; + } + + r = unit_patch_contexts(u); + if (r < 0) + return r; + + r = unit_add_exec_dependencies(u, &m->exec_context); + if (r < 0) + return r; + + r = unit_set_default_slice(u); + if (r < 0) + return r; + + r = mount_add_non_exec_dependencies(m); + if (r < 0) + return r; + + return 0; +} + +static void mount_load_root_mount(Unit *u) { + assert(u); + + if (!unit_has_name(u, SPECIAL_ROOT_MOUNT)) + return; + + u->perpetual = true; + u->default_dependencies = false; + + /* The stdio/kmsg bridge socket is on /, in order to avoid a dep loop, don't use kmsg logging for -.mount */ + MOUNT(u)->exec_context.std_output = EXEC_OUTPUT_NULL; + MOUNT(u)->exec_context.std_input = EXEC_INPUT_NULL; + + if (!u->description) + u->description = strdup("Root Mount"); +} + +static int mount_load(Unit *u) { + Mount *m = MOUNT(u); + int r, q = 0; + + assert(m); + 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_disable_unref(m->timer_event_source); + mount_unwatch_control_pid(m); + m->control_command = NULL; + m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; + } + + if (state != old_state) + log_unit_debug(UNIT(m), "Changed %s -> %s", mount_state_to_string(old_state), mount_state_to_string(state)); + + unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state], + m->reload_result == MOUNT_SUCCESS ? 0 : UNIT_NOTIFY_RELOAD_FAILURE); +} + +static int mount_coldplug(Unit *u) { + Mount *m = MOUNT(u); + int r; + + assert(m); + assert(m->state == MOUNT_DEAD); + + if (m->deserialized_state == m->state) + return 0; + + if (m->control_pid > 0 && + pid_is_unwaited(m->control_pid) && + MOUNT_STATE_WITH_PROCESS(m->deserialized_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(m->deserialized_state, MOUNT_DEAD, MOUNT_FAILED)) { + (void) unit_setup_dynamic_creds(u); + (void) unit_setup_exec_runtime(u); + } + + mount_set_state(m, m->deserialized_state); + return 0; +} + +static void mount_catchup(Unit *u) { + Mount *m = MOUNT(ASSERT_PTR(u)); + + assert(m); + + /* Adjust the deserialized state. See comments in mount_process_proc_self_mountinfo(). */ + if (m->from_proc_self_mountinfo) + switch (m->state) { + case MOUNT_DEAD: + case MOUNT_FAILED: + assert(m->control_pid == 0); + (void) unit_acquire_invocation_id(u); + mount_cycle_clear(m); + mount_enter_mounted(m, MOUNT_SUCCESS); + break; + case MOUNT_MOUNTING: + assert(m->control_pid > 0); + mount_set_state(m, MOUNT_MOUNTING_DONE); + break; + default: + break; + } + else + switch (m->state) { + case MOUNT_MOUNTING_DONE: + assert(m->control_pid > 0); + mount_set_state(m, MOUNT_MOUNTING); + break; + case MOUNT_MOUNTED: + assert(m->control_pid == 0); + mount_enter_dead(m, MOUNT_SUCCESS); + break; + default: + break; + } +} + +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" + "%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(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. Let's re-generate dependencies from + * .mount unit. */ + (void) mount_add_non_exec_dependencies(m); +} + +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; + bool source_is_dir = true; + + assert(m); + + r = unit_fail_if_noncanonical(UNIT(m), m->where); + if (r < 0) + goto fail; + + p = get_mount_parameters_fragment(m); + if (p && mount_is_bind(p)) { + r = is_dir(p->what, /* follow = */ true); + if (r < 0 && r != -ENOENT) + log_unit_info_errno(UNIT(m), r, "Failed to determine type of bind mount source '%s', ignoring: %m", p->what); + else if (r == 0) + source_is_dir = false; + } + + if (source_is_dir) + r = mkdir_p_label(m->where, m->directory_mode); + else + r = touch_file(m->where, /* parents = */ true, USEC_INFINITY, UID_INVALID, GID_INVALID, MODE_INVALID); + if (r < 0 && r != -EEXIST) + log_unit_warning_errno(UNIT(m), r, "Failed to create mount point '%s', ignoring: %m", m->where); + + if (source_is_dir) + 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 */ + if (p && mount_is_bind(p)) { + r = mkdir_p_label(p->what, m->directory_mode); + /* mkdir_p_label() can return -EEXIST if the target path exists and is not a directory - which is + * totally OK, in case the user wants us to overmount a non-directory inode. Also -EROFS can be + * returned on read-only filesystem. Moreover, -EACCES (and also maybe -EPERM?) may be returned + * when the path is on NFS. See issue #24120. All such errors will be logged in the debug level. */ + if (r < 0 && r != -EEXIST) + log_unit_full_errno(UNIT(m), + (r == -EROFS || ERRNO_IS_PRIVILEGE(r)) ? LOG_DEBUG : LOG_WARNING, + r, "Failed to make bind mount source '%s', ignoring: %m", p->what); + } + + if (p) { + _cleanup_free_ char *opts = NULL; + + r = fstab_filter_options(p->options, "nofail\0" "noauto\0" "auto\0", NULL, 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_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(); + } +} + +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(m); + assert(u); + assert(key); + assert(value); + assert(fds); + + if (streq(key, "state")) { + MountState state; + + state = mount_state_from_string(value); + if (state < 0) + log_unit_debug_errno(u, state, "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_errno(u, f, "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_errno(u, f, "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_errno(u, r, "Failed to parse n-retry-umount value: %s", value); + + } else if (streq(key, "control-pid")) { + + r = parse_pid(value, &m->control_pid); + if (r < 0) + log_unit_debug_errno(u, r, "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_errno(u, id, "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(); + + 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(); + } + + /* 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(); + } + + 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; + + r = mount_add_non_exec_dependencies(MOUNT(u)); + if (r < 0) + return r; + + /* 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. */ + 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; + + r = unit_name_from_path(where, ".mount", &e); + if (r < 0) + return log_struct_errno( + LOG_WARNING, r, + "MESSAGE_ID=" SD_MESSAGE_MOUNT_POINT_PATH_NOT_SUITABLE_STR, + "MOUNT_POINT=%s", where, + LOG_MESSAGE("Failed to generate valid unit name from mount point 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_disable_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; + + assert(m); + assert(u); + + 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 int mount_on_ratelimit_expire(sd_event_source *s, void *userdata) { + Manager *m = ASSERT_PTR(userdata); + Job *j; + + /* Let's enqueue all start jobs that were previously skipped because of active ratelimit. */ + HASHMAP_FOREACH(j, m->jobs) { + if (j->unit->type != UNIT_MOUNT) + continue; + + job_add_to_run_queue(j); + } + + /* By entering ratelimited state we made all mount start jobs not runnable, now rate limit is over so + * let's make sure we dispatch them in the next iteration. */ + manager_trigger_run_queue(m); + + return 0; +} + +static void mount_enumerate(Manager *m) { + int r; + + assert(m); + + mnt_init_debug(0); + + if (!m->mount_monitor) { + unsigned mount_rate_limit_burst = 5; + 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; + } + + /* Let users override the default (5 in 1s), as it stalls the boot sequence on busy systems. */ + const char *e = secure_getenv("SYSTEMD_DEFAULT_MOUNT_RATE_LIMIT_BURST"); + if (e) { + r = safe_atou(e, &mount_rate_limit_burst); + if (r < 0) + log_debug("Invalid value in $SYSTEMD_DEFAULT_MOUNT_RATE_LIMIT_BURST, ignoring: %s", e); + } + + r = sd_event_source_set_ratelimit(m->mount_event_source, 1 * USEC_PER_SEC, mount_rate_limit_burst); + if (r < 0) { + log_error_errno(r, "Failed to enable rate limit for mount events: %m"); + goto fail; + } + + r = sd_event_source_set_ratelimit_expire_callback(m->mount_event_source, mount_on_ratelimit_expire); + 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_ Set *around = NULL, *gone = NULL; + const char *what; + 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_put_strdup_full(&gone, &path_hash_ops_free, 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_put_strdup_full(&around, &path_hash_ops_free, 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, DEVICE_NOT_FOUND, DEVICE_FOUND_MOUNT); + } + + return 0; +} + +static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { + Manager *m = ASSERT_PTR(userdata); + + 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_disable_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 int mount_can_start(Unit *u) { + Mount *m = MOUNT(u); + int r; + + assert(m); + + r = unit_test_start_limit(u); + if (r < 0) { + mount_enter_dead(m, MOUNT_FAILURE_START_LIMIT_HIT); + return r; + } + + return 1; +} + +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, + .exclude_from_switch_root_serialization = true, + + .init = mount_init, + .load = mount_load, + .done = mount_done, + + .coldplug = mount_coldplug, + .catchup = mount_catchup, + + .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.", + }, + }, + + .can_start = mount_can_start, +}; 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