| /* 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 "fstab-util.h" | |
| #include "libmount-util.h" | |
| #include "log.h" | |
| #include "manager.h" | |
| #include "mkdir.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 "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 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_automount(const MountParameters *p) { | |
| assert(p); | |
| return fstab_test_option(p->options, | |
| "comment=systemd.automount\0" | |
| "x-systemd.automount\0"); | |
| } | |
| 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); | |
| /* Quotas are not enabled on network filesystems, but we want them, for example, on storage connected via | |
| * iscsi. We hence don't use mount_is_network() here, as that would also return true for _netdev devices. */ | |
| if (p->fstype && fstype_is_network(p->fstype)) | |
| return false; | |
| if (mount_is_bind(p)) | |
| return false; | |
| return fstab_test_option(p->options, | |
| "usrquota\0" "grpquota\0" "quota\0" "usrjquota\0" "grpjquota\0"); | |
| } | |
| static void mount_init(Unit *u) { | |
| Mount *m = MOUNT(u); | |
| assert(u); | |
| assert(u->load_state == UNIT_STUB); | |
| m->timeout_usec = u->manager->default_timeout_start_usec; | |
| m->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 (m->timer_event_source) { | |
| r = sd_event_source_set_time(m->timer_event_source, usec); | |
| if (r < 0) | |
| return r; | |
| return sd_event_source_set_enabled(m->timer_event_source, SD_EVENT_ONESHOT); | |
| } | |
| if (usec == USEC_INFINITY) | |
| return 0; | |
| r = sd_event_add_time( | |
| UNIT(m)->manager->event, | |
| &m->timer_event_source, | |
| CLOCK_MONOTONIC, | |
| usec, 0, | |
| mount_dispatch_timer, m); | |
| if (r < 0) | |
| return r; | |
| (void) sd_event_source_set_description(m->timer_event_source, "mount-timer"); | |
| return 0; | |
| } | |
| static void mount_unwatch_control_pid(Mount *m) { | |
| assert(m); | |
| if (m->control_pid <= 0) | |
| return; | |
| unit_unwatch_pid(UNIT(m), m->control_pid); | |
| m->control_pid = 0; | |
| } | |
| static void mount_parameters_done(MountParameters *p) { | |
| assert(p); | |
| 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 */ | |
| parent = dirname_malloc(m->where); | |
| if (!parent) | |
| return -ENOMEM; | |
| 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); | |
| p = get_mount_parameters(m); | |
| if (!p) | |
| return 0; | |
| if (!p->what) | |
| return 0; | |
| if (mount_is_bind(p)) | |
| return 0; | |
| if (!is_device_path(p->what)) | |
| return 0; | |
| /* /dev/root is a really weird thing, it's not a real device, but just a path the kernel exports for | |
| * the root file system specified on the kernel command line. Ignore it here. */ | |
| if (PATH_IN_SET(p->what, "/dev/root", "/dev/nfs")) | |
| return 0; | |
| if (path_equal(m->where, "/")) | |
| 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_IMPLICIT : UNIT_DEPENDENCY_FILE; | |
| r = unit_add_node_dependency(UNIT(m), p->what, dep, mask); | |
| if (r < 0) | |
| return r; | |
| if (mount_propagate_stop(m)) { | |
| r = unit_add_node_dependency(UNIT(m), p->what, UNIT_STOP_PROPAGATED_FROM, mask); | |
| if (r < 0) | |
| return r; | |
| } | |
| return unit_add_blockdev_dependency(UNIT(m), p->what, mask); | |
| } | |
| static int mount_add_quota_dependencies(Mount *m) { | |
| UnitDependencyMask mask; | |
| 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; | |
| mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT; | |
| r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, true, mask); | |
| if (r < 0) | |
| return r; | |
| r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, true, mask); | |
| 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. */ | |
| after = NULL; | |
| before = isempty(e) ? SPECIAL_INITRD_ROOT_FS_TARGET : SPECIAL_INITRD_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) && !mount_is_automount(p)) { | |
| r = unit_add_dependency_by_name(UNIT(m), UNIT_BEFORE, before, true, mask); | |
| if (r < 0) | |
| return r; | |
| } | |
| if (after) { | |
| r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, true, mask); | |
| if (r < 0) | |
| return r; | |
| } | |
| return unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, | |
| SPECIAL_UMOUNT_TARGET, 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_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_DEFAULT; | |
| 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, 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, 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, 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); | |
| 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_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); | |
| 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); | |
| /* 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. */ | |
| if (r < 0 && r != -EEXIST) { | |
| log_unit_error_errno(UNIT(m), r, "Failed to make bind mount source '%s': %m", p->what); | |
| goto fail; | |
| } | |
| } | |
| 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_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; | |
| 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("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; | |
| r = mount_add_non_exec_dependencies(MOUNT(u)); | |
| 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, | |
| }; | |
| if (r == -ENAMETOOLONG) | |
| 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("Mount point path '%s' too long to fit into unit name, ignoring mount point.", where)); | |
| 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 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; | |
| 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_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 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, | |
| .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.", | |
| }, | |
| }, | |
| }; |