/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include #include #include #include #include #include #include #include #include "alloc-util.h" #include "async.h" #include "automount.h" #include "bus-error.h" #include "bus-util.h" #include "dbus-automount.h" #include "dbus-unit.h" #include "fd-util.h" #include "format-util.h" #include "fstab-util.h" #include "io-util.h" #include "label.h" #include "mkdir-label.h" #include "mount-util.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 "stdio-util.h" #include "string-table.h" #include "string-util.h" #include "unit-name.h" #include "unit.h" static const UnitActiveState state_translation_table[_AUTOMOUNT_STATE_MAX] = { [AUTOMOUNT_DEAD] = UNIT_INACTIVE, [AUTOMOUNT_WAITING] = UNIT_ACTIVE, [AUTOMOUNT_RUNNING] = UNIT_ACTIVE, [AUTOMOUNT_FAILED] = UNIT_FAILED }; struct expire_data { int dev_autofs_fd; int ioctl_fd; }; static struct expire_data* expire_data_free(struct expire_data *data) { if (!data) return NULL; safe_close(data->dev_autofs_fd); safe_close(data->ioctl_fd); return mfree(data); } DEFINE_TRIVIAL_CLEANUP_FUNC(struct expire_data*, expire_data_free); static int open_dev_autofs(Manager *m); static int automount_dispatch_io(sd_event_source *s, int fd, uint32_t events, void *userdata); static int automount_start_expire(Automount *a); static void automount_stop_expire(Automount *a); static int automount_send_ready(Automount *a, Set *tokens, int status); static void automount_init(Unit *u) { Automount *a = AUTOMOUNT(u); assert(a); assert(u); assert(u->load_state == UNIT_STUB); a->pipe_fd = -1; a->directory_mode = 0755; UNIT(a)->ignore_on_isolate = true; } static void unmount_autofs(Automount *a) { int r; assert(a); if (a->pipe_fd < 0) return; a->pipe_event_source = sd_event_source_disable_unref(a->pipe_event_source); a->pipe_fd = safe_close(a->pipe_fd); /* If we reload/reexecute things we keep the mount point around */ if (!IN_SET(UNIT(a)->manager->objective, MANAGER_RELOAD, MANAGER_REEXECUTE)) { automount_send_ready(a, a->tokens, -EHOSTDOWN); automount_send_ready(a, a->expire_tokens, -EHOSTDOWN); if (a->where) { r = repeat_unmount(a->where, MNT_DETACH|UMOUNT_NOFOLLOW); if (r < 0) log_error_errno(r, "Failed to unmount: %m"); } } } static void automount_done(Unit *u) { Automount *a = AUTOMOUNT(u); assert(a); unmount_autofs(a); a->where = mfree(a->where); a->extra_options = mfree(a->extra_options); a->tokens = set_free(a->tokens); a->expire_tokens = set_free(a->expire_tokens); a->expire_event_source = sd_event_source_disable_unref(a->expire_event_source); } static int automount_add_trigger_dependencies(Automount *a) { Unit *x; int r; assert(a); r = unit_load_related_unit(UNIT(a), ".mount", &x); if (r < 0) return r; return unit_add_two_dependencies(UNIT(a), UNIT_BEFORE, UNIT_TRIGGERS, x, true, UNIT_DEPENDENCY_IMPLICIT); } static int automount_add_mount_dependencies(Automount *a) { _cleanup_free_ char *parent = NULL; assert(a); parent = dirname_malloc(a->where); if (!parent) return -ENOMEM; return unit_require_mounts_for(UNIT(a), parent, UNIT_DEPENDENCY_IMPLICIT); } static int automount_add_default_dependencies(Automount *a) { int r; assert(a); if (!UNIT(a)->default_dependencies) return 0; if (!MANAGER_IS_SYSTEM(UNIT(a)->manager)) return 0; r = unit_add_dependency_by_name(UNIT(a), UNIT_BEFORE, SPECIAL_LOCAL_FS_TARGET, true, UNIT_DEPENDENCY_DEFAULT); if (r < 0) return r; r = unit_add_dependency_by_name(UNIT(a), UNIT_AFTER, SPECIAL_LOCAL_FS_PRE_TARGET, true, UNIT_DEPENDENCY_DEFAULT); if (r < 0) return r; r = unit_add_two_dependencies_by_name(UNIT(a), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, true, UNIT_DEPENDENCY_DEFAULT); if (r < 0) return r; return 0; } static int automount_verify(Automount *a) { static const char *const reserved_options[] = { "fd\0", "pgrp\0", "minproto\0", "maxproto\0", "direct\0", "indirect\0", }; _cleanup_free_ char *e = NULL; int r; assert(a); assert(UNIT(a)->load_state == UNIT_LOADED); if (path_equal(a->where, "/")) return log_unit_error_errno(UNIT(a), SYNTHETIC_ERRNO(ENOEXEC), "Cannot have an automount unit for the root directory. Refusing."); r = unit_name_from_path(a->where, ".automount", &e); if (r < 0) return log_unit_error_errno(UNIT(a), r, "Failed to generate unit name from path: %m"); if (!unit_has_name(UNIT(a), e)) return log_unit_error_errno(UNIT(a), SYNTHETIC_ERRNO(ENOEXEC), "Where= setting doesn't match unit name. Refusing."); for (size_t i = 0; i < ELEMENTSOF(reserved_options); i++) if (fstab_test_option(a->extra_options, reserved_options[i])) return log_unit_error_errno( UNIT(a), SYNTHETIC_ERRNO(ENOEXEC), "ExtraOptions= setting may not contain reserved option %s.", reserved_options[i]); return 0; } static int automount_set_where(Automount *a) { int r; assert(a); if (a->where) return 0; r = unit_name_to_path(UNIT(a)->id, &a->where); if (r < 0) return r; path_simplify(a->where); return 1; } static int automount_add_extras(Automount *a) { int r; r = automount_set_where(a); if (r < 0) return r; r = automount_add_trigger_dependencies(a); if (r < 0) return r; r = automount_add_mount_dependencies(a); if (r < 0) return r; return automount_add_default_dependencies(a); } static int automount_load(Unit *u) { Automount *a = AUTOMOUNT(u); int r; assert(u); assert(u->load_state == UNIT_STUB); /* Load a .automount file */ r = unit_load_fragment_and_dropin(u, true); if (r < 0) return r; if (u->load_state != UNIT_LOADED) return 0; r = automount_add_extras(a); if (r < 0) return r; return automount_verify(a); } static void automount_set_state(Automount *a, AutomountState state) { AutomountState old_state; assert(a); if (a->state != state) bus_unit_send_pending_change_signal(UNIT(a), false); old_state = a->state; a->state = state; if (state != AUTOMOUNT_RUNNING) automount_stop_expire(a); if (!IN_SET(state, AUTOMOUNT_WAITING, AUTOMOUNT_RUNNING)) unmount_autofs(a); if (state != old_state) log_unit_debug(UNIT(a), "Changed %s -> %s", automount_state_to_string(old_state), automount_state_to_string(state)); unit_notify(UNIT(a), state_translation_table[old_state], state_translation_table[state], 0); } static int automount_coldplug(Unit *u) { Automount *a = AUTOMOUNT(u); int r; assert(a); assert(a->state == AUTOMOUNT_DEAD); if (a->deserialized_state == a->state) return 0; if (IN_SET(a->deserialized_state, AUTOMOUNT_WAITING, AUTOMOUNT_RUNNING)) { r = automount_set_where(a); if (r < 0) return r; r = open_dev_autofs(u->manager); if (r < 0) return r; assert(a->pipe_fd >= 0); r = sd_event_add_io(u->manager->event, &a->pipe_event_source, a->pipe_fd, EPOLLIN, automount_dispatch_io, u); if (r < 0) return r; (void) sd_event_source_set_description(a->pipe_event_source, "automount-io"); if (a->deserialized_state == AUTOMOUNT_RUNNING) { r = automount_start_expire(a); if (r < 0) log_unit_warning_errno(UNIT(a), r, "Failed to start expiration timer, ignoring: %m"); } automount_set_state(a, a->deserialized_state); } return 0; } static void automount_dump(Unit *u, FILE *f, const char *prefix) { Automount *a = AUTOMOUNT(u); assert(a); fprintf(f, "%sAutomount State: %s\n" "%sResult: %s\n" "%sWhere: %s\n" "%sExtraOptions: %s\n" "%sDirectoryMode: %04o\n" "%sTimeoutIdleUSec: %s\n", prefix, automount_state_to_string(a->state), prefix, automount_result_to_string(a->result), prefix, a->where, prefix, a->extra_options, prefix, a->directory_mode, prefix, FORMAT_TIMESPAN(a->timeout_idle_usec, USEC_PER_SEC)); } static void automount_enter_dead(Automount *a, AutomountResult f) { assert(a); if (a->result == AUTOMOUNT_SUCCESS) a->result = f; unit_log_result(UNIT(a), a->result == AUTOMOUNT_SUCCESS, automount_result_to_string(a->result)); automount_set_state(a, a->result != AUTOMOUNT_SUCCESS ? AUTOMOUNT_FAILED : AUTOMOUNT_DEAD); } static int open_dev_autofs(Manager *m) { struct autofs_dev_ioctl param; assert(m); if (m->dev_autofs_fd >= 0) return m->dev_autofs_fd; (void) label_fix("/dev/autofs", 0); m->dev_autofs_fd = open("/dev/autofs", O_CLOEXEC|O_RDONLY); if (m->dev_autofs_fd < 0) return log_error_errno(errno, "Failed to open /dev/autofs: %m"); init_autofs_dev_ioctl(¶m); if (ioctl(m->dev_autofs_fd, AUTOFS_DEV_IOCTL_VERSION, ¶m) < 0) { m->dev_autofs_fd = safe_close(m->dev_autofs_fd); return -errno; } log_debug("Autofs kernel version %i.%i", param.ver_major, param.ver_minor); return m->dev_autofs_fd; } static int open_ioctl_fd(int dev_autofs_fd, const char *where, dev_t devid) { struct autofs_dev_ioctl *param; size_t l; assert(dev_autofs_fd >= 0); assert(where); l = sizeof(struct autofs_dev_ioctl) + strlen(where) + 1; param = alloca_safe(l); init_autofs_dev_ioctl(param); param->size = l; param->ioctlfd = -1; param->openmount.devid = devid; strcpy(param->path, where); if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_OPENMOUNT, param) < 0) return -errno; if (param->ioctlfd < 0) return -EIO; (void) fd_cloexec(param->ioctlfd, true); return param->ioctlfd; } static int autofs_protocol(int dev_autofs_fd, int ioctl_fd) { uint32_t major, minor; struct autofs_dev_ioctl param; assert(dev_autofs_fd >= 0); assert(ioctl_fd >= 0); init_autofs_dev_ioctl(¶m); param.ioctlfd = ioctl_fd; if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_PROTOVER, ¶m) < 0) return -errno; major = param.protover.version; init_autofs_dev_ioctl(¶m); param.ioctlfd = ioctl_fd; if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_PROTOSUBVER, ¶m) < 0) return -errno; minor = param.protosubver.sub_version; log_debug("Autofs protocol version %i.%i", major, minor); return 0; } static int autofs_set_timeout(int dev_autofs_fd, int ioctl_fd, usec_t usec) { struct autofs_dev_ioctl param; assert(dev_autofs_fd >= 0); assert(ioctl_fd >= 0); init_autofs_dev_ioctl(¶m); param.ioctlfd = ioctl_fd; if (usec == USEC_INFINITY) param.timeout.timeout = 0; else /* Convert to seconds, rounding up. */ param.timeout.timeout = DIV_ROUND_UP(usec, USEC_PER_SEC); return RET_NERRNO(ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_TIMEOUT, ¶m)); } static int autofs_send_ready(int dev_autofs_fd, int ioctl_fd, uint32_t token, int status) { struct autofs_dev_ioctl param; assert(dev_autofs_fd >= 0); assert(ioctl_fd >= 0); init_autofs_dev_ioctl(¶m); param.ioctlfd = ioctl_fd; if (status != 0) { param.fail.token = token; param.fail.status = status; } else param.ready.token = token; return RET_NERRNO(ioctl(dev_autofs_fd, status ? AUTOFS_DEV_IOCTL_FAIL : AUTOFS_DEV_IOCTL_READY, ¶m)); } static int automount_send_ready(Automount *a, Set *tokens, int status) { _cleanup_close_ int ioctl_fd = -1; unsigned token; int r; assert(a); assert(status <= 0); if (set_isempty(tokens)) return 0; ioctl_fd = open_ioctl_fd(UNIT(a)->manager->dev_autofs_fd, a->where, a->dev_id); if (ioctl_fd < 0) return ioctl_fd; if (status != 0) log_unit_debug_errno(UNIT(a), status, "Sending failure: %m"); else log_unit_debug(UNIT(a), "Sending success."); r = 0; /* Autofs thankfully does not hand out 0 as a token */ while ((token = PTR_TO_UINT(set_steal_first(tokens)))) { int k; /* Autofs fun fact: * * if you pass a positive status code here, kernels * prior to 4.12 will freeze! Yay! */ k = autofs_send_ready(UNIT(a)->manager->dev_autofs_fd, ioctl_fd, token, status); if (k < 0) r = k; } return r; } static void automount_trigger_notify(Unit *u, Unit *other) { Automount *a = AUTOMOUNT(u); int r; assert(a); assert(other); /* Filter out invocations with bogus state */ assert(UNIT_IS_LOAD_COMPLETE(other->load_state)); assert(other->type == UNIT_MOUNT); /* Don't propagate state changes from the mount if we are already down */ if (!IN_SET(a->state, AUTOMOUNT_WAITING, AUTOMOUNT_RUNNING)) return; /* Propagate start limit hit state */ if (other->start_limit_hit) { automount_enter_dead(a, AUTOMOUNT_FAILURE_MOUNT_START_LIMIT_HIT); return; } /* Don't propagate anything if there's still a job queued */ if (other->job) return; /* The mount is successfully established */ if (IN_SET(MOUNT(other)->state, MOUNT_MOUNTED, MOUNT_REMOUNTING)) { (void) automount_send_ready(a, a->tokens, 0); r = automount_start_expire(a); if (r < 0) log_unit_warning_errno(UNIT(a), r, "Failed to start expiration timer, ignoring: %m"); automount_set_state(a, AUTOMOUNT_RUNNING); } if (IN_SET(MOUNT(other)->state, MOUNT_MOUNTING, MOUNT_MOUNTING_DONE, MOUNT_MOUNTED, MOUNT_REMOUNTING, MOUNT_REMOUNTING_SIGTERM, MOUNT_REMOUNTING_SIGKILL, MOUNT_UNMOUNTING_SIGTERM, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILED)) (void) automount_send_ready(a, a->expire_tokens, -ENODEV); if (MOUNT(other)->state == MOUNT_DEAD) (void) automount_send_ready(a, a->expire_tokens, 0); /* The mount is in some unhappy state now, let's unfreeze any waiting clients */ if (IN_SET(MOUNT(other)->state, MOUNT_DEAD, MOUNT_UNMOUNTING, MOUNT_REMOUNTING_SIGTERM, MOUNT_REMOUNTING_SIGKILL, MOUNT_UNMOUNTING_SIGTERM, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILED)) { (void) automount_send_ready(a, a->tokens, -ENODEV); automount_set_state(a, AUTOMOUNT_WAITING); } } static void automount_enter_waiting(Automount *a) { _cleanup_close_ int ioctl_fd = -1; int p[2] = { -1, -1 }; char name[STRLEN("systemd-") + DECIMAL_STR_MAX(pid_t) + 1]; _cleanup_free_ char *options = NULL; bool mounted = false; int r, dev_autofs_fd; struct stat st; assert(a); assert(a->pipe_fd < 0); assert(a->where); set_clear(a->tokens); r = unit_fail_if_noncanonical(UNIT(a), a->where); if (r < 0) goto fail; (void) mkdir_p_label(a->where, a->directory_mode); unit_warn_if_dir_nonempty(UNIT(a), a->where); dev_autofs_fd = open_dev_autofs(UNIT(a)->manager); if (dev_autofs_fd < 0) { r = dev_autofs_fd; goto fail; } if (pipe2(p, O_CLOEXEC) < 0) { r = -errno; goto fail; } r = fd_nonblock(p[0], true); if (r < 0) goto fail; if (asprintf( &options, "fd=%i,pgrp="PID_FMT",minproto=5,maxproto=5,direct%s%s", p[1], getpgrp(), isempty(a->extra_options) ? "" : ",", strempty(a->extra_options)) < 0) { r = -ENOMEM; goto fail; } xsprintf(name, "systemd-"PID_FMT, getpid_cached()); r = mount_nofollow(name, a->where, "autofs", 0, options); if (r < 0) goto fail; mounted = true; p[1] = safe_close(p[1]); if (stat(a->where, &st) < 0) { r = -errno; goto fail; } ioctl_fd = open_ioctl_fd(dev_autofs_fd, a->where, st.st_dev); if (ioctl_fd < 0) { r = ioctl_fd; goto fail; } r = autofs_protocol(dev_autofs_fd, ioctl_fd); if (r < 0) goto fail; r = autofs_set_timeout(dev_autofs_fd, ioctl_fd, a->timeout_idle_usec); if (r < 0) goto fail; r = sd_event_add_io(UNIT(a)->manager->event, &a->pipe_event_source, p[0], EPOLLIN, automount_dispatch_io, a); if (r < 0) goto fail; (void) sd_event_source_set_description(a->pipe_event_source, "automount-io"); a->pipe_fd = p[0]; a->dev_id = st.st_dev; automount_set_state(a, AUTOMOUNT_WAITING); return; fail: log_unit_error_errno(UNIT(a), r, "Failed to initialize automounter: %m"); safe_close_pair(p); if (mounted) { r = repeat_unmount(a->where, MNT_DETACH|UMOUNT_NOFOLLOW); if (r < 0) log_error_errno(r, "Failed to unmount, ignoring: %m"); } automount_enter_dead(a, AUTOMOUNT_FAILURE_RESOURCES); } static void *expire_thread(void *p) { struct autofs_dev_ioctl param; _cleanup_(expire_data_freep) struct expire_data *data = p; int r; assert(data->dev_autofs_fd >= 0); assert(data->ioctl_fd >= 0); init_autofs_dev_ioctl(¶m); param.ioctlfd = data->ioctl_fd; do { r = ioctl(data->dev_autofs_fd, AUTOFS_DEV_IOCTL_EXPIRE, ¶m); } while (r >= 0); if (errno != EAGAIN) log_warning_errno(errno, "Failed to expire automount, ignoring: %m"); return NULL; } static int automount_dispatch_expire(sd_event_source *source, usec_t usec, void *userdata) { Automount *a = AUTOMOUNT(userdata); _cleanup_(expire_data_freep) struct expire_data *data = NULL; int r; assert(a); assert(source == a->expire_event_source); data = new0(struct expire_data, 1); if (!data) return log_oom(); data->ioctl_fd = -1; data->dev_autofs_fd = fcntl(UNIT(a)->manager->dev_autofs_fd, F_DUPFD_CLOEXEC, 3); if (data->dev_autofs_fd < 0) return log_unit_error_errno(UNIT(a), errno, "Failed to duplicate autofs fd: %m"); data->ioctl_fd = open_ioctl_fd(UNIT(a)->manager->dev_autofs_fd, a->where, a->dev_id); if (data->ioctl_fd < 0) return log_unit_error_errno(UNIT(a), data->ioctl_fd, "Couldn't open autofs ioctl fd: %m"); r = asynchronous_job(expire_thread, data); if (r < 0) return log_unit_error_errno(UNIT(a), r, "Failed to start expire job: %m"); data = NULL; return automount_start_expire(a); } static int automount_start_expire(Automount *a) { usec_t timeout; int r; assert(a); if (a->timeout_idle_usec == 0) return 0; timeout = MAX(a->timeout_idle_usec/3, USEC_PER_SEC); if (a->expire_event_source) { r = sd_event_source_set_time_relative(a->expire_event_source, timeout); if (r < 0) return r; return sd_event_source_set_enabled(a->expire_event_source, SD_EVENT_ONESHOT); } r = sd_event_add_time_relative( UNIT(a)->manager->event, &a->expire_event_source, CLOCK_MONOTONIC, timeout, 0, automount_dispatch_expire, a); if (r < 0) return r; (void) sd_event_source_set_description(a->expire_event_source, "automount-expire"); return 0; } static void automount_stop_expire(Automount *a) { assert(a); if (!a->expire_event_source) return; (void) sd_event_source_set_enabled(a->expire_event_source, SD_EVENT_OFF); } static void automount_enter_running(Automount *a) { _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; Unit *trigger; struct stat st; int r; assert(a); /* If the user masked our unit in the meantime, fail */ if (UNIT(a)->load_state != UNIT_LOADED) { log_unit_error(UNIT(a), "Suppressing automount event since unit is no longer loaded."); goto fail; } /* We don't take mount requests anymore if we are supposed to * shut down anyway */ if (unit_stop_pending(UNIT(a))) { log_unit_debug(UNIT(a), "Suppressing automount request since unit stop is scheduled."); automount_send_ready(a, a->tokens, -EHOSTDOWN); automount_send_ready(a, a->expire_tokens, -EHOSTDOWN); return; } (void) mkdir_p_label(a->where, a->directory_mode); /* Before we do anything, let's see if somebody is playing games with us? */ if (lstat(a->where, &st) < 0) { log_unit_warning_errno(UNIT(a), errno, "Failed to stat automount point: %m"); goto fail; } /* The mount unit may have been explicitly started before we got the * autofs request. Ack it to unblock anything waiting on the mount point. */ if (!S_ISDIR(st.st_mode) || st.st_dev != a->dev_id) { log_unit_info(UNIT(a), "Automount point already active?"); automount_send_ready(a, a->tokens, 0); return; } trigger = UNIT_TRIGGER(UNIT(a)); if (!trigger) { log_unit_error(UNIT(a), "Unit to trigger vanished."); goto fail; } r = manager_add_job(UNIT(a)->manager, JOB_START, trigger, JOB_REPLACE, NULL, &error, NULL); if (r < 0) { log_unit_warning(UNIT(a), "Failed to queue mount startup job: %s", bus_error_message(&error, r)); goto fail; } automount_set_state(a, AUTOMOUNT_RUNNING); return; fail: automount_enter_dead(a, AUTOMOUNT_FAILURE_RESOURCES); } static int automount_start(Unit *u) { Automount *a = AUTOMOUNT(u); int r; assert(a); assert(IN_SET(a->state, AUTOMOUNT_DEAD, AUTOMOUNT_FAILED)); if (path_is_mount_point(a->where, NULL, 0) > 0) return log_unit_error_errno(u, SYNTHETIC_ERRNO(EEXIST), "Path %s is already a mount point, refusing start.", a->where); r = unit_test_trigger_loaded(u); if (r < 0) return r; r = unit_acquire_invocation_id(u); if (r < 0) return r; a->result = AUTOMOUNT_SUCCESS; automount_enter_waiting(a); return 1; } static int automount_stop(Unit *u) { Automount *a = AUTOMOUNT(u); assert(a); assert(IN_SET(a->state, AUTOMOUNT_WAITING, AUTOMOUNT_RUNNING)); automount_enter_dead(a, AUTOMOUNT_SUCCESS); return 1; } static int automount_serialize(Unit *u, FILE *f, FDSet *fds) { Automount *a = AUTOMOUNT(u); void *p; int r; assert(a); assert(f); assert(fds); (void) serialize_item(f, "state", automount_state_to_string(a->state)); (void) serialize_item(f, "result", automount_result_to_string(a->result)); (void) serialize_item_format(f, "dev-id", "%lu", (unsigned long) a->dev_id); SET_FOREACH(p, a->tokens) (void) serialize_item_format(f, "token", "%u", PTR_TO_UINT(p)); SET_FOREACH(p, a->expire_tokens) (void) serialize_item_format(f, "expire-token", "%u", PTR_TO_UINT(p)); r = serialize_fd(f, fds, "pipe-fd", a->pipe_fd); if (r < 0) return r; return 0; } static int automount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { Automount *a = AUTOMOUNT(u); int r; assert(a); assert(fds); if (streq(key, "state")) { AutomountState state; state = automount_state_from_string(value); if (state < 0) log_unit_debug(u, "Failed to parse state value: %s", value); else a->deserialized_state = state; } else if (streq(key, "result")) { AutomountResult f; f = automount_result_from_string(value); if (f < 0) log_unit_debug(u, "Failed to parse result value: %s", value); else if (f != AUTOMOUNT_SUCCESS) a->result = f; } else if (streq(key, "dev-id")) { unsigned long d; if (safe_atolu(value, &d) < 0) log_unit_debug(u, "Failed to parse dev-id value: %s", value); else a->dev_id = (dev_t) d; } else if (streq(key, "token")) { unsigned token; if (safe_atou(value, &token) < 0) log_unit_debug(u, "Failed to parse token value: %s", value); else { r = set_ensure_put(&a->tokens, NULL, UINT_TO_PTR(token)); if (r < 0) log_unit_error_errno(u, r, "Failed to add token to set: %m"); } } else if (streq(key, "expire-token")) { unsigned token; if (safe_atou(value, &token) < 0) log_unit_debug(u, "Failed to parse token value: %s", value); else { r = set_ensure_put(&a->expire_tokens, NULL, UINT_TO_PTR(token)); if (r < 0) log_unit_error_errno(u, r, "Failed to add expire token to set: %m"); } } else if (streq(key, "pipe-fd")) { int fd; if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) log_unit_debug(u, "Failed to parse pipe-fd value: %s", value); else { safe_close(a->pipe_fd); a->pipe_fd = fdset_remove(fds, fd); } } else log_unit_debug(u, "Unknown serialization key: %s", key); return 0; } static UnitActiveState automount_active_state(Unit *u) { assert(u); return state_translation_table[AUTOMOUNT(u)->state]; } static const char *automount_sub_state_to_string(Unit *u) { assert(u); return automount_state_to_string(AUTOMOUNT(u)->state); } static bool automount_may_gc(Unit *u) { Unit *t; assert(u); t = UNIT_TRIGGER(u); if (!t) return true; return UNIT_VTABLE(t)->may_gc(t); } static int automount_dispatch_io(sd_event_source *s, int fd, uint32_t events, void *userdata) { _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; union autofs_v5_packet_union packet; Automount *a = AUTOMOUNT(userdata); Unit *trigger; int r; assert(a); assert(fd == a->pipe_fd); if (events & (EPOLLHUP|EPOLLERR)) { log_unit_error(UNIT(a), "Got hangup/error on autofs pipe from kernel. Likely our automount point has been unmounted by someone or something else?"); automount_enter_dead(a, AUTOMOUNT_FAILURE_UNMOUNTED); return 0; } if (events != EPOLLIN) { log_unit_error(UNIT(a), "Got invalid poll event %"PRIu32" on pipe (fd=%d)", events, fd); goto fail; } r = loop_read_exact(a->pipe_fd, &packet, sizeof(packet), true); if (r < 0) { log_unit_error_errno(UNIT(a), r, "Invalid read from pipe: %m"); goto fail; } switch (packet.hdr.type) { case autofs_ptype_missing_direct: if (packet.v5_packet.pid > 0) { _cleanup_free_ char *p = NULL; (void) get_process_comm(packet.v5_packet.pid, &p); log_unit_info(UNIT(a), "Got automount request for %s, triggered by %"PRIu32" (%s)", a->where, packet.v5_packet.pid, strna(p)); } else log_unit_debug(UNIT(a), "Got direct mount request on %s", a->where); r = set_ensure_put(&a->tokens, NULL, UINT_TO_PTR(packet.v5_packet.wait_queue_token)); if (r < 0) { log_unit_error_errno(UNIT(a), r, "Failed to remember token: %m"); goto fail; } automount_enter_running(a); break; case autofs_ptype_expire_direct: log_unit_debug(UNIT(a), "Got direct umount request on %s", a->where); automount_stop_expire(a); r = set_ensure_put(&a->expire_tokens, NULL, UINT_TO_PTR(packet.v5_packet.wait_queue_token)); if (r < 0) { log_unit_error_errno(UNIT(a), r, "Failed to remember token: %m"); goto fail; } trigger = UNIT_TRIGGER(UNIT(a)); if (!trigger) { log_unit_error(UNIT(a), "Unit to trigger vanished."); goto fail; } r = manager_add_job(UNIT(a)->manager, JOB_STOP, trigger, JOB_REPLACE, NULL, &error, NULL); if (r < 0) { log_unit_warning(UNIT(a), "Failed to queue umount startup job: %s", bus_error_message(&error, r)); goto fail; } break; default: log_unit_error(UNIT(a), "Received unknown automount request %i", packet.hdr.type); break; } return 0; fail: automount_enter_dead(a, AUTOMOUNT_FAILURE_RESOURCES); return 0; } static void automount_shutdown(Manager *m) { assert(m); m->dev_autofs_fd = safe_close(m->dev_autofs_fd); } static void automount_reset_failed(Unit *u) { Automount *a = AUTOMOUNT(u); assert(a); if (a->state == AUTOMOUNT_FAILED) automount_set_state(a, AUTOMOUNT_DEAD); a->result = AUTOMOUNT_SUCCESS; } static bool automount_supported(void) { static int supported = -1; if (supported < 0) supported = access("/dev/autofs", F_OK) >= 0; return supported; } static int automount_can_start(Unit *u) { Automount *a = AUTOMOUNT(u); int r; assert(a); r = unit_test_start_limit(u); if (r < 0) { automount_enter_dead(a, AUTOMOUNT_FAILURE_START_LIMIT_HIT); return r; } return 1; } static const char* const automount_result_table[_AUTOMOUNT_RESULT_MAX] = { [AUTOMOUNT_SUCCESS] = "success", [AUTOMOUNT_FAILURE_RESOURCES] = "resources", [AUTOMOUNT_FAILURE_START_LIMIT_HIT] = "start-limit-hit", [AUTOMOUNT_FAILURE_MOUNT_START_LIMIT_HIT] = "mount-start-limit-hit", [AUTOMOUNT_FAILURE_UNMOUNTED] = "unmounted", }; DEFINE_STRING_TABLE_LOOKUP(automount_result, AutomountResult); const UnitVTable automount_vtable = { .object_size = sizeof(Automount), .sections = "Unit\0" "Automount\0" "Install\0", .private_section = "Automount", .can_transient = true, .can_fail = true, .can_trigger = true, .exclude_from_switch_root_serialization = true, .init = automount_init, .load = automount_load, .done = automount_done, .coldplug = automount_coldplug, .dump = automount_dump, .start = automount_start, .stop = automount_stop, .serialize = automount_serialize, .deserialize_item = automount_deserialize_item, .active_state = automount_active_state, .sub_state_to_string = automount_sub_state_to_string, .may_gc = automount_may_gc, .trigger_notify = automount_trigger_notify, .reset_failed = automount_reset_failed, .bus_set_property = bus_automount_set_property, .shutdown = automount_shutdown, .supported = automount_supported, .status_message_formats = { .finished_start_job = { [JOB_DONE] = "Set up automount %s.", [JOB_FAILED] = "Failed to set up automount %s.", }, .finished_stop_job = { [JOB_DONE] = "Unset automount %s.", [JOB_FAILED] = "Failed to unset automount %s.", }, }, .can_start = automount_can_start, };