/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2010 Lennart Poettering systemd is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. systemd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include <errno.h> #include <stdio.h> #include <mntent.h> #include <sys/epoll.h> #include <signal.h> #include "unit.h" #include "mount.h" #include "load-fragment.h" #include "load-dropin.h" #include "log.h" #include "strv.h" #include "mount-setup.h" #include "unit-name.h" #include "mount.h" #include "dbus-mount.h" #include "special.h" static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = { [MOUNT_DEAD] = UNIT_INACTIVE, [MOUNT_MOUNTING] = UNIT_ACTIVATING, [MOUNT_MOUNTING_DONE] = UNIT_ACTIVE, [MOUNT_MOUNTED] = UNIT_ACTIVE, [MOUNT_REMOUNTING] = UNIT_RELOADING, [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING, [MOUNT_MOUNTING_SIGTERM] = UNIT_DEACTIVATING, [MOUNT_MOUNTING_SIGKILL] = UNIT_DEACTIVATING, [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING, [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING, [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING, [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING, [MOUNT_MAINTENANCE] = UNIT_MAINTENANCE }; static void mount_init(Unit *u) { Mount *m = MOUNT(u); assert(u); assert(u->meta.load_state == UNIT_STUB); m->timeout_usec = DEFAULT_TIMEOUT_USEC; m->directory_mode = 0755; exec_context_init(&m->exec_context); /* We need to make sure that /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->timer_watch.type = WATCH_INVALID; m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; } static void mount_unwatch_control_pid(Mount *m) { assert(m); if (m->control_pid <= 0) return; unit_unwatch_pid(UNIT(m), m->control_pid); m->control_pid = 0; } static void mount_parameters_done(MountParameters *p) { assert(p); free(p->what); free(p->options); free(p->fstype); p->what = p->options = p->fstype = NULL; } static void mount_done(Unit *u) { Mount *m = MOUNT(u); assert(m); free(m->where); m->where = NULL; mount_parameters_done(&m->parameters_etc_fstab); mount_parameters_done(&m->parameters_proc_self_mountinfo); mount_parameters_done(&m->parameters_fragment); exec_context_done(&m->exec_context); exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX); m->control_command = NULL; mount_unwatch_control_pid(m); unit_unwatch_timer(u, &m->timer_watch); } static int mount_add_mount_links(Mount *m) { Meta *other; int r; assert(m); /* Adds in links to other mount points that might lie below or * above us in the hierarchy */ LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_MOUNT]) { Mount *n = (Mount*) other; if (n == m) continue; if (n->meta.load_state != UNIT_LOADED) continue; if (path_startswith(m->where, n->where)) { if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0) return r; if (n->from_etc_fstab || n->from_fragment) if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0) return r; } else if (path_startswith(n->where, m->where)) { if ((r = unit_add_dependency(UNIT(m), UNIT_BEFORE, UNIT(n), true)) < 0) return r; if (m->from_etc_fstab || m->from_fragment) if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0) return r; } } return 0; } static int mount_add_swap_links(Mount *m) { Meta *other; int r; assert(m); LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_SWAP]) if ((r = swap_add_one_mount_link((Swap*) other, m)) < 0) return r; return 0; } static int mount_add_path_links(Mount *m) { Meta *other; int r; assert(m); LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_PATH]) if ((r = path_add_one_mount_link((Path*) other, m)) < 0) return r; return 0; } static int mount_add_automount_links(Mount *m) { Meta *other; int r; assert(m); LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_AUTOMOUNT]) if ((r = automount_add_one_mount_link((Automount*) other, m)) < 0) return r; return 0; } static int mount_add_socket_links(Mount *m) { Meta *other; int r; assert(m); LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_SOCKET]) if ((r = socket_add_one_mount_link((Socket*) other, m)) < 0) return r; return 0; } static char* mount_test_option(const char *haystack, const char *needle) { struct mntent me; assert(needle); /* Like glibc's hasmntopt(), but works on a string, not a * struct mntent */ if (!haystack) return false; zero(me); me.mnt_opts = (char*) haystack; return hasmntopt(&me, needle); } static int mount_add_target_links(Mount *m) { const char *target; MountParameters *p; Unit *tu; int r; bool noauto, handle, automount, user; assert(m); if (m->from_fragment) p = &m->parameters_fragment; else if (m->from_etc_fstab) p = &m->parameters_etc_fstab; else return 0; noauto = !!mount_test_option(p->options, MNTOPT_NOAUTO); user = mount_test_option(p->options, "user") || mount_test_option(p->options, "users"); handle = !!mount_test_option(p->options, "comment=systemd.mount"); automount = !!mount_test_option(p->options, "comment=systemd.automount"); if (mount_test_option(p->options, "_netdev") || fstype_is_network(p->fstype)) target = SPECIAL_REMOTE_FS_TARGET; else target = SPECIAL_LOCAL_FS_TARGET; if ((r = manager_load_unit(m->meta.manager, target, NULL, NULL, &tu)) < 0) return r; if (automount && m->meta.manager->running_as == MANAGER_SYSTEM) { Unit *am; if ((r = unit_load_related_unit(UNIT(m), ".automount", &am)) < 0) return r; return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_WANTS, UNIT(am), true); } else { if (!noauto && handle) if (user || m->meta.manager->running_as == MANAGER_SYSTEM) if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true)) < 0) return r; return unit_add_dependency(UNIT(m), UNIT_BEFORE, tu, true); } } static int mount_add_default_dependencies(Mount *m) { int r; assert(m); if (m->meta.manager->running_as == MANAGER_SYSTEM && !path_equal(m->where, "/")) { if ((r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_FSCK_TARGET, NULL, true)) < 0) return r; if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTED_BY, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0) return r; } return 0; } static int mount_verify(Mount *m) { bool b; char *e; assert(m); if (m->meta.load_state != UNIT_LOADED) return 0; if (!m->from_etc_fstab && !m->from_fragment && !m->from_proc_self_mountinfo) return -ENOENT; if (!(e = unit_name_from_path(m->where, ".mount"))) return -ENOMEM; b = unit_has_name(UNIT(m), e); free(e); if (!b) { log_error("%s's Where setting doesn't match unit name. Refusing.", m->meta.id); return -EINVAL; } if (m->meta.fragment_path && !m->parameters_fragment.what) { log_error("%s's What setting is missing. Refusing.", m->meta.id); return -EBADMSG; } if (m->exec_context.pam_name && m->exec_context.kill_mode != KILL_CONTROL_GROUP) { log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", m->meta.id); return -EINVAL; } return 0; } static int mount_load(Unit *u) { Mount *m = MOUNT(u); int r; assert(u); assert(u->meta.load_state == UNIT_STUB); if ((r = unit_load_fragment_and_dropin_optional(u)) < 0) return r; /* This is a new unit? Then let's add in some extras */ if (u->meta.load_state == UNIT_LOADED) { const char *what = NULL; if (m->meta.fragment_path) m->from_fragment = true; if (!m->where) if (!(m->where = unit_name_to_path(u->meta.id))) return -ENOMEM; path_kill_slashes(m->where); if (!m->meta.description) if ((r = unit_set_description(u, m->where)) < 0) return r; if (m->from_fragment && m->parameters_fragment.what) what = m->parameters_fragment.what; else if (m->from_etc_fstab && m->parameters_etc_fstab.what) what = m->parameters_etc_fstab.what; else if (m->from_proc_self_mountinfo && m->parameters_proc_self_mountinfo.what) what = m->parameters_proc_self_mountinfo.what; if (what && !path_equal(m->where, "/")) if ((r = unit_add_node_link(u, what, u->meta.manager->running_as == MANAGER_SYSTEM)) < 0) return r; if ((r = mount_add_mount_links(m)) < 0) return r; if ((r = mount_add_socket_links(m)) < 0) return r; if ((r = mount_add_swap_links(m)) < 0) return r; if ((r = mount_add_path_links(m)) < 0) return r; if ((r = mount_add_automount_links(m)) < 0) return r; if ((r = mount_add_target_links(m)) < 0) return r; if ((r = unit_add_default_cgroup(u)) < 0) return r; if (m->meta.default_dependencies) if ((r = mount_add_default_dependencies(m)) < 0) return r; } return mount_verify(m); } static int mount_notify_automount(Mount *m, int status) { Unit *p; int r; assert(m); if ((r = unit_get_related_unit(UNIT(m), ".automount", &p)) < 0) return r == -ENOENT ? 0 : r; return automount_send_ready(AUTOMOUNT(p), status); } static void mount_set_state(Mount *m, MountState state) { MountState old_state; assert(m); old_state = m->state; m->state = state; if (state != MOUNT_MOUNTING && state != MOUNT_MOUNTING_DONE && state != MOUNT_REMOUNTING && state != MOUNT_UNMOUNTING && state != MOUNT_MOUNTING_SIGTERM && state != MOUNT_MOUNTING_SIGKILL && state != MOUNT_UNMOUNTING_SIGTERM && state != MOUNT_UNMOUNTING_SIGKILL && state != MOUNT_REMOUNTING_SIGTERM && state != MOUNT_REMOUNTING_SIGKILL) { unit_unwatch_timer(UNIT(m), &m->timer_watch); mount_unwatch_control_pid(m); m->control_command = NULL; m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; } if (state == MOUNT_MOUNTED || state == MOUNT_REMOUNTING) mount_notify_automount(m, 0); else if (state == MOUNT_DEAD || state == MOUNT_UNMOUNTING || state == MOUNT_MOUNTING_SIGTERM || state == MOUNT_MOUNTING_SIGKILL || state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL || state == MOUNT_UNMOUNTING_SIGTERM || state == MOUNT_UNMOUNTING_SIGKILL || state == MOUNT_MAINTENANCE) mount_notify_automount(m, -ENODEV); if (state != old_state) log_debug("%s changed %s -> %s", m->meta.id, mount_state_to_string(old_state), mount_state_to_string(state)); unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state]); } 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) { if (new_state == MOUNT_MOUNTING || new_state == MOUNT_MOUNTING_DONE || new_state == MOUNT_REMOUNTING || new_state == MOUNT_UNMOUNTING || new_state == MOUNT_MOUNTING_SIGTERM || new_state == MOUNT_MOUNTING_SIGKILL || new_state == MOUNT_UNMOUNTING_SIGTERM || new_state == MOUNT_UNMOUNTING_SIGKILL || new_state == MOUNT_REMOUNTING_SIGTERM || new_state == MOUNT_REMOUNTING_SIGKILL) { if (m->control_pid <= 0) return -EBADMSG; if ((r = unit_watch_pid(UNIT(m), m->control_pid)) < 0) return r; if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0) return r; } mount_set_state(m, new_state); } return 0; } static void mount_dump(Unit *u, FILE *f, const char *prefix) { Mount *m = MOUNT(u); MountParameters *p; assert(m); assert(f); if (m->from_proc_self_mountinfo) p = &m->parameters_proc_self_mountinfo; else if (m->from_fragment) p = &m->parameters_fragment; else p = &m->parameters_etc_fstab; fprintf(f, "%sMount State: %s\n" "%sWhere: %s\n" "%sWhat: %s\n" "%sFile System Type: %s\n" "%sOptions: %s\n" "%sFrom /etc/fstab: %s\n" "%sFrom /proc/self/mountinfo: %s\n" "%sFrom fragment: %s\n" "%sDirectoryMode: %04o\n", prefix, mount_state_to_string(m->state), prefix, m->where, prefix, strna(p->what), prefix, strna(p->fstype), prefix, strna(p->options), prefix, yes_no(m->from_etc_fstab), prefix, yes_no(m->from_proc_self_mountinfo), prefix, yes_no(m->from_fragment), prefix, m->directory_mode); if (m->control_pid > 0) fprintf(f, "%sControl PID: %lu\n", prefix, (unsigned long) m->control_pid); exec_context_dump(&m->exec_context, f, prefix); } static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) { pid_t pid; int r; assert(m); assert(c); assert(_pid); if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0) goto fail; if ((r = exec_spawn(c, NULL, &m->exec_context, NULL, 0, m->meta.manager->environment, true, true, true, m->meta.manager->confirm_spawn, m->meta.cgroup_bondings, &pid)) < 0) goto fail; if ((r = unit_watch_pid(UNIT(m), pid)) < 0) /* FIXME: we need to do something here */ goto fail; *_pid = pid; return 0; fail: unit_unwatch_timer(UNIT(m), &m->timer_watch); return r; } static void mount_enter_dead(Mount *m, bool success) { assert(m); if (!success) m->failure = true; mount_set_state(m, m->failure ? MOUNT_MAINTENANCE : MOUNT_DEAD); } static void mount_enter_mounted(Mount *m, bool success) { assert(m); if (!success) m->failure = true; mount_set_state(m, MOUNT_MOUNTED); } static void mount_enter_signal(Mount *m, MountState state, bool success) { int r; bool sent = false; assert(m); if (!success) m->failure = true; if (m->exec_context.kill_mode != KILL_NONE) { int sig = (state == MOUNT_MOUNTING_SIGTERM || state == MOUNT_UNMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGTERM) ? m->exec_context.kill_signal : SIGKILL; if (m->exec_context.kill_mode == KILL_CONTROL_GROUP) { if ((r = cgroup_bonding_kill_list(m->meta.cgroup_bondings, sig)) < 0) { if (r != -EAGAIN && r != -ESRCH) goto fail; } else sent = true; } if (!sent && m->control_pid > 0) if (kill(m->exec_context.kill_mode == KILL_PROCESS ? m->control_pid : -m->control_pid, sig) < 0 && errno != ESRCH) { r = -errno; goto fail; } } if (sent) { if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0) goto fail; mount_set_state(m, state); } else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL) mount_enter_mounted(m, true); else mount_enter_dead(m, true); return; fail: log_warning("%s failed to kill processes: %s", m->meta.id, strerror(-r)); if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL) mount_enter_mounted(m, false); else mount_enter_dead(m, false); } static void mount_enter_unmounting(Mount *m, bool success) { int r; assert(m); if (!success) m->failure = true; m->control_command_id = MOUNT_EXEC_UNMOUNT; m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT; if ((r = exec_command_set( m->control_command, "/bin/umount", m->where, NULL)) < 0) goto fail; mount_unwatch_control_pid(m); if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0) goto fail; mount_set_state(m, MOUNT_UNMOUNTING); return; fail: log_warning("%s failed to run 'umount' task: %s", m->meta.id, strerror(-r)); mount_enter_mounted(m, false); } static void mount_enter_mounting(Mount *m) { int r; assert(m); m->control_command_id = MOUNT_EXEC_MOUNT; m->control_command = m->exec_command + MOUNT_EXEC_MOUNT; mkdir_p(m->where, m->directory_mode); if (m->from_fragment) r = exec_command_set( m->control_command, "/bin/mount", m->parameters_fragment.what, m->where, "-t", m->parameters_fragment.fstype, m->parameters_fragment.options ? "-o" : NULL, m->parameters_fragment.options, NULL); else if (m->from_etc_fstab) r = exec_command_set( m->control_command, "/bin/mount", m->where, NULL); else r = -ENOENT; if (r < 0) goto fail; mount_unwatch_control_pid(m); if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0) goto fail; mount_set_state(m, MOUNT_MOUNTING); return; fail: log_warning("%s failed to run 'mount' task: %s", m->meta.id, strerror(-r)); mount_enter_dead(m, false); } static void mount_enter_mounting_done(Mount *m) { assert(m); mount_set_state(m, MOUNT_MOUNTING_DONE); } static void mount_enter_remounting(Mount *m, bool success) { int r; assert(m); if (!success) m->failure = true; m->control_command_id = MOUNT_EXEC_REMOUNT; m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT; if (m->from_fragment) { char *buf = NULL; const char *o; if (m->parameters_fragment.options) { if (!(buf = strappend("remount,", m->parameters_fragment.options))) { r = -ENOMEM; goto fail; } o = buf; } else o = "remount"; r = exec_command_set( m->control_command, "/bin/mount", m->parameters_fragment.what, m->where, "-t", m->parameters_fragment.fstype, "-o", o, NULL); free(buf); } else if (m->from_etc_fstab) r = exec_command_set( m->control_command, "/bin/mount", m->where, "-o", "remount", NULL); else r = -ENOENT; if (r < 0) { r = -ENOMEM; goto fail; } mount_unwatch_control_pid(m); if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0) goto fail; mount_set_state(m, MOUNT_REMOUNTING); return; fail: log_warning("%s failed to run 'remount' task: %s", m->meta.id, strerror(-r)); mount_enter_mounted(m, false); } static int mount_start(Unit *u) { Mount *m = MOUNT(u); assert(m); /* We cannot fulfill this request right now, try again later * please! */ if (m->state == MOUNT_UNMOUNTING || m->state == MOUNT_UNMOUNTING_SIGTERM || m->state == MOUNT_UNMOUNTING_SIGKILL) return -EAGAIN; /* Already on it! */ if (m->state == MOUNT_MOUNTING || m->state == MOUNT_MOUNTING_SIGTERM || m->state == MOUNT_MOUNTING_SIGKILL) return 0; assert(m->state == MOUNT_DEAD || m->state == MOUNT_MAINTENANCE); m->failure = false; mount_enter_mounting(m); return 0; } static int mount_stop(Unit *u) { Mount *m = MOUNT(u); assert(m); /* Already on it */ if (m->state == MOUNT_UNMOUNTING || m->state == MOUNT_UNMOUNTING_SIGKILL || m->state == MOUNT_UNMOUNTING_SIGTERM) return 0; assert(m->state == MOUNT_MOUNTING || m->state == MOUNT_MOUNTING_DONE || m->state == MOUNT_MOUNTED || m->state == MOUNT_MOUNTING_SIGTERM || m->state == MOUNT_MOUNTING_SIGKILL || m->state == MOUNT_REMOUNTING || m->state == MOUNT_REMOUNTING_SIGTERM || m->state == MOUNT_REMOUNTING_SIGKILL); mount_enter_unmounting(m, true); return 0; } static int mount_reload(Unit *u) { Mount *m = MOUNT(u); assert(m); if (m->state == MOUNT_MOUNTING_DONE) return -EAGAIN; assert(m->state == MOUNT_MOUNTED); mount_enter_remounting(m, true); return 0; } static int mount_serialize(Unit *u, FILE *f, FDSet *fds) { Mount *m = MOUNT(u); assert(m); assert(f); assert(fds); unit_serialize_item(u, f, "state", mount_state_to_string(m->state)); unit_serialize_item(u, f, "failure", yes_no(m->failure)); if (m->control_pid > 0) unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) m->control_pid); if (m->control_command_id >= 0) unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id)); return 0; } static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { Mount *m = MOUNT(u); assert(u); assert(key); assert(value); assert(fds); if (streq(key, "state")) { MountState state; if ((state = mount_state_from_string(value)) < 0) log_debug("Failed to parse state value %s", value); else m->deserialized_state = state; } else if (streq(key, "failure")) { int b; if ((b = parse_boolean(value)) < 0) log_debug("Failed to parse failure value %s", value); else m->failure = b || m->failure; } else if (streq(key, "control-pid")) { pid_t pid; if (parse_pid(value, &pid) < 0) log_debug("Failed to parse control-pid value %s", value); else m->control_pid = pid; } else if (streq(key, "control-command")) { MountExecCommand id; if ((id = mount_exec_command_from_string(value)) < 0) log_debug("Failed to parse exec-command value %s", value); else { m->control_command_id = id; m->control_command = m->exec_command + id; } } else log_debug("Unknown serialization key '%s'", key); return 0; } static UnitActiveState mount_active_state(Unit *u) { assert(u); return state_translation_table[MOUNT(u)->state]; } static const char *mount_sub_state_to_string(Unit *u) { assert(u); return mount_state_to_string(MOUNT(u)->state); } static bool mount_check_gc(Unit *u) { Mount *m = MOUNT(u); assert(m); return m->from_etc_fstab || m->from_proc_self_mountinfo; } static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) { Mount *m = MOUNT(u); bool success; assert(m); assert(pid >= 0); if (pid != m->control_pid) return; m->control_pid = 0; success = is_clean_exit(code, status); m->failure = m->failure || !success; if (m->control_command) { exec_status_exit(&m->control_command->exec_status, pid, code, status); m->control_command = NULL; m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; } log_full(success ? LOG_DEBUG : LOG_NOTICE, "%s mount process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status); /* Note that mount(8) returning and the kernel sending us a * mount table change event might happen out-of-order. If an * operation succeed we assume the kernel will follow soon too * and already change into the resulting state. If it fails * we check if the kernel still knows about the mount. and * change state accordingly. */ switch (m->state) { case MOUNT_MOUNTING: case MOUNT_MOUNTING_DONE: case MOUNT_MOUNTING_SIGKILL: case MOUNT_MOUNTING_SIGTERM: case MOUNT_REMOUNTING: case MOUNT_REMOUNTING_SIGKILL: case MOUNT_REMOUNTING_SIGTERM: if (success) mount_enter_mounted(m, true); else if (m->from_proc_self_mountinfo) mount_enter_mounted(m, false); else mount_enter_dead(m, false); break; case MOUNT_UNMOUNTING: case MOUNT_UNMOUNTING_SIGKILL: case MOUNT_UNMOUNTING_SIGTERM: if (success) mount_enter_dead(m, true); else if (m->from_proc_self_mountinfo) mount_enter_mounted(m, false); else mount_enter_dead(m, false); 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 void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) { Mount *m = MOUNT(u); assert(m); assert(elapsed == 1); assert(w == &m->timer_watch); switch (m->state) { case MOUNT_MOUNTING: case MOUNT_MOUNTING_DONE: log_warning("%s mounting timed out. Stopping.", u->meta.id); mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false); break; case MOUNT_REMOUNTING: log_warning("%s remounting timed out. Stopping.", u->meta.id); mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, false); break; case MOUNT_UNMOUNTING: log_warning("%s unmounting timed out. Stopping.", u->meta.id); mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false); break; case MOUNT_MOUNTING_SIGTERM: log_warning("%s mounting timed out. Killing.", u->meta.id); mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false); break; case MOUNT_REMOUNTING_SIGTERM: log_warning("%s remounting timed out. Killing.", u->meta.id); mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false); break; case MOUNT_UNMOUNTING_SIGTERM: log_warning("%s unmounting timed out. Killing.", u->meta.id); mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false); break; case MOUNT_MOUNTING_SIGKILL: case MOUNT_REMOUNTING_SIGKILL: case MOUNT_UNMOUNTING_SIGKILL: log_warning("%s mount process still around after SIGKILL. Ignoring.", u->meta.id); if (m->from_proc_self_mountinfo) mount_enter_mounted(m, false); else mount_enter_dead(m, false); break; default: assert_not_reached("Timeout at wrong time."); } } static int mount_add_one( Manager *m, const char *what, const char *where, const char *options, const char *fstype, bool from_proc_self_mountinfo, bool set_flags) { int r; Unit *u; bool delete; char *e, *w = NULL, *o = NULL, *f = NULL; MountParameters *p; assert(m); assert(what); assert(where); assert(options); assert(fstype); assert(!set_flags || from_proc_self_mountinfo); /* Ignore API mount points. They should never be referenced in * dependencies ever. */ if (mount_point_is_api(where)) return 0; if (streq(fstype, "autofs")) return 0; /* probably some kind of swap, ignore */ if (!is_path(where)) return 0; if (!(e = unit_name_from_path(where, ".mount"))) return -ENOMEM; if (!(u = manager_get_unit(m, e))) { delete = true; if (!(u = unit_new(m))) { free(e); return -ENOMEM; } r = unit_add_name(u, e); free(e); if (r < 0) goto fail; if (!(MOUNT(u)->where = strdup(where))) { r = -ENOMEM; goto fail; } unit_add_to_load_queue(u); } else { delete = false; free(e); } if (!(w = strdup(what)) || !(o = strdup(options)) || !(f = strdup(fstype))) { r = -ENOMEM; goto fail; } if (from_proc_self_mountinfo) { p = &MOUNT(u)->parameters_proc_self_mountinfo; if (set_flags) { MOUNT(u)->is_mounted = true; MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo; MOUNT(u)->just_changed = !streq_ptr(p->options, o); } MOUNT(u)->from_proc_self_mountinfo = true; } else { p = &MOUNT(u)->parameters_etc_fstab; MOUNT(u)->from_etc_fstab = true; } free(p->what); p->what = w; free(p->options); p->options = o; free(p->fstype); p->fstype = f; unit_add_to_dbus_queue(u); return 0; fail: free(w); free(o); free(f); if (delete && u) unit_free(u); return r; } static char *fstab_node_to_udev_node(char *p) { char *dn, *t, *u; int r; /* FIXME: to follow udev's logic 100% we need to leave valid * UTF8 chars unescaped */ if (startswith(p, "LABEL=")) { if (!(u = unquote(p+6, '"'))) return NULL; t = xescape(u, "/ "); free(u); if (!t) return NULL; r = asprintf(&dn, "/dev/disk/by-label/%s", t); free(t); if (r < 0) return NULL; return dn; } if (startswith(p, "UUID=")) { if (!(u = unquote(p+5, '"'))) return NULL; t = xescape(u, "/ "); free(u); if (!t) return NULL; r = asprintf(&dn, "/dev/disk/by-uuid/%s", ascii_strlower(t)); free(t); if (r < 0) return NULL; return dn; } return strdup(p); } static int mount_find_pri(char *options) { char *end, *pri; unsigned long r; if (!(pri = mount_test_option(options, "pri="))) return 0; pri += 4; errno = 0; r = strtoul(pri, &end, 10); if (errno != 0) return -errno; if (end == pri || (*end != ',' && *end != 0)) return -EINVAL; return (int) r; } static int mount_load_etc_fstab(Manager *m) { FILE *f; int r; struct mntent* me; assert(m); errno = 0; if (!(f = setmntent("/etc/fstab", "r"))) return -errno; while ((me = getmntent(f))) { char *where, *what; if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) { r = -ENOMEM; goto finish; } if (!(where = strdup(me->mnt_dir))) { free(what); r = -ENOMEM; goto finish; } if (what[0] == '/') path_kill_slashes(what); if (where[0] == '/') path_kill_slashes(where); if (streq(me->mnt_type, "swap")) { int pri; if ((pri = mount_find_pri(me->mnt_opts)) < 0) r = pri; else r = swap_add_one(m, what, pri, !!mount_test_option(me->mnt_opts, MNTOPT_NOAUTO), !!mount_test_option(me->mnt_opts, "comment=systemd.swapon"), false); } else r = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, false, false); free(what); free(where); if (r < 0) goto finish; } r = 0; finish: endmntent(f); return r; } static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) { int r; char *device, *path, *options, *options2, *fstype, *d, *p, *o; assert(m); rewind(m->proc_self_mountinfo); for (;;) { int k; device = path = options = options2 = fstype = d = p = o = NULL; if ((k = fscanf(m->proc_self_mountinfo, "%*s " /* (1) mount id */ "%*s " /* (2) parent id */ "%*s " /* (3) major:minor */ "%*s " /* (4) root */ "%ms " /* (5) mount point */ "%ms" /* (6) mount options */ "%*[^-]" /* (7) optional fields */ "- " /* (8) seperator */ "%ms " /* (9) file system type */ "%ms" /* (10) mount source */ "%ms" /* (11) mount options 2 */ "%*[^\n]", /* some rubbish at the end */ &path, &options, &fstype, &device, &options2)) != 5) { if (k == EOF) break; r = -EBADMSG; goto finish; } if (asprintf(&o, "%s,%s", options, options2) < 0) { r = -ENOMEM; goto finish; } if (!(d = cunescape(device)) || !(p = cunescape(path))) { r = -ENOMEM; goto finish; } if ((r = mount_add_one(m, d, p, o, fstype, true, set_flags)) < 0) goto finish; free(device); free(path); free(options); free(options2); free(fstype); free(d); free(p); free(o); } r = 0; finish: free(device); free(path); free(options); free(options2); free(fstype); free(d); free(p); free(o); return r; } static void mount_shutdown(Manager *m) { assert(m); if (m->proc_self_mountinfo) { fclose(m->proc_self_mountinfo); m->proc_self_mountinfo = NULL; } } static int mount_enumerate(Manager *m) { int r; struct epoll_event ev; assert(m); if (!m->proc_self_mountinfo) { if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "re"))) return -errno; m->mount_watch.type = WATCH_MOUNT; m->mount_watch.fd = fileno(m->proc_self_mountinfo); zero(ev); ev.events = EPOLLERR; ev.data.ptr = &m->mount_watch; if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0) return -errno; } if ((r = mount_load_etc_fstab(m)) < 0) goto fail; if ((r = mount_load_proc_self_mountinfo(m, false)) < 0) goto fail; return 0; fail: mount_shutdown(m); return r; } void mount_fd_event(Manager *m, int events) { Meta *meta; int r; assert(m); assert(events == EPOLLERR); /* The manager calls this for every fd event happening on the * /proc/self/mountinfo file, which informs us about mounting * table changes */ if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) { log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-r)); /* Reset flags, just in case, for later calls */ LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) { Mount *mount = (Mount*) meta; mount->is_mounted = mount->just_mounted = mount->just_changed = false; } return; } manager_dispatch_load_queue(m); LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) { Mount *mount = (Mount*) meta; if (!mount->is_mounted) { /* This has just been unmounted. */ mount->from_proc_self_mountinfo = false; switch (mount->state) { case MOUNT_MOUNTED: mount_enter_dead(mount, true); break; default: mount_set_state(mount, mount->state); break; } } else if (mount->just_mounted || mount->just_changed) { /* New or changed entrymount */ switch (mount->state) { case MOUNT_DEAD: case MOUNT_MAINTENANCE: mount_enter_mounted(mount, true); break; case MOUNT_MOUNTING: mount_enter_mounting_done(mount); 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; } } /* Reset the flags for later calls */ mount->is_mounted = mount->just_mounted = mount->just_changed = false; } } static void mount_reset_maintenance(Unit *u) { Mount *m = MOUNT(u); assert(m); if (m->state == MOUNT_MAINTENANCE) mount_set_state(m, MOUNT_DEAD); m->failure = false; } static const char* const mount_state_table[_MOUNT_STATE_MAX] = { [MOUNT_DEAD] = "dead", [MOUNT_MOUNTING] = "mounting", [MOUNT_MOUNTING_DONE] = "mounting-done", [MOUNT_MOUNTED] = "mounted", [MOUNT_REMOUNTING] = "remounting", [MOUNT_UNMOUNTING] = "unmounting", [MOUNT_MOUNTING_SIGTERM] = "mounting-sigterm", [MOUNT_MOUNTING_SIGKILL] = "mounting-sigkill", [MOUNT_REMOUNTING_SIGTERM] = "remounting-sigterm", [MOUNT_REMOUNTING_SIGKILL] = "remounting-sigkill", [MOUNT_UNMOUNTING_SIGTERM] = "unmounting-sigterm", [MOUNT_UNMOUNTING_SIGKILL] = "unmounting-sigkill", [MOUNT_MAINTENANCE] = "maintenance" }; DEFINE_STRING_TABLE_LOOKUP(mount_state, MountState); 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); const UnitVTable mount_vtable = { .suffix = ".mount", .no_alias = true, .no_instances = true, .no_isolate = true, .show_status = 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, .serialize = mount_serialize, .deserialize_item = mount_deserialize_item, .active_state = mount_active_state, .sub_state_to_string = mount_sub_state_to_string, .check_gc = mount_check_gc, .sigchld_event = mount_sigchld_event, .timer_event = mount_timer_event, .reset_maintenance = mount_reset_maintenance, .bus_interface = "org.freedesktop.systemd1.Mount", .bus_message_handler = bus_mount_message_handler, .bus_invalidating_properties = bus_mount_invalidating_properties, .enumerate = mount_enumerate, .shutdown = mount_shutdown };