diff options
Diffstat (limited to 'src/mount.c')
| -rw-r--r-- | src/mount.c | 1539 |
1 files changed, 1539 insertions, 0 deletions
diff --git a/src/mount.c b/src/mount.c new file mode 100644 index 0000000000..ec03a52f6a --- /dev/null +++ b/src/mount.c @@ -0,0 +1,1539 @@ +/*-*- Mode: C; c-basic-offset: 8 -*-*/ + +/*** + 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" + +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_ACTIVE_RELOADING, + [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING, + [MOUNT_MOUNTING_SIGTERM] = UNIT_DEACTIVATING, + [MOUNT_MOUNTING_SIGKILL] = UNIT_DEACTIVATING, + [MOUNT_REMOUNTING_SIGTERM] = UNIT_ACTIVE_RELOADING, + [MOUNT_REMOUNTING_SIGKILL] = UNIT_ACTIVE_RELOADING, + [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING, + [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING, + [MOUNT_MAINTAINANCE] = UNIT_INACTIVE, +}; + +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; + 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.no_setsid = 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_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; + + 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); + 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(UNIT(m)->meta.manager, target, NULL, &tu)) < 0) + return r; + + if (automount) { + Unit *am; + + if ((r = unit_load_related_unit(UNIT(m), ".automount", &am)) < 0) + return r; + + if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(am), true)) < 0) + return r; + + return unit_add_dependency(UNIT(am), UNIT_BEFORE, tu, true); + + } else { + + if (!noauto && handle) + 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_verify(Mount *m) { + bool b; + char *e; + assert(m); + + if (UNIT(m)->meta.load_state != UNIT_LOADED) + return 0; + + 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.", UNIT(m)->meta.id); + return -EINVAL; + } + + if (m->meta.fragment_path && !m->parameters_fragment.what) { + log_error("%s's What setting is missing. Refusing.", UNIT(m)->meta.id); + return -EBADMSG; + } + + 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) + if ((r = unit_add_node_link(u, what, + (u->meta.manager->running_as == MANAGER_INIT || + 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_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; + } + + 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_MAINTAINANCE) + mount_notify_automount(m, -ENODEV); + + if (state != old_state) + log_debug("%s changed %s -> %s", + UNIT(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" + "%sKillMode: %s\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, kill_mode_to_string(m->kill_mode)); + + if (m->control_pid > 0) + fprintf(f, + "%sControl PID: %llu\n", + prefix, (unsigned long 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, + UNIT(m)->meta.manager->confirm_spawn, + UNIT(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_MAINTAINANCE : 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->kill_mode != KILL_NONE) { + int sig = (state == MOUNT_MOUNTING_SIGTERM || + state == MOUNT_UNMOUNTING_SIGTERM || + state == MOUNT_REMOUNTING_SIGTERM) ? SIGTERM : SIGKILL; + + if (m->kill_mode == KILL_CONTROL_GROUP) { + + if ((r = cgroup_bonding_kill_list(UNIT(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->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", UNIT(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 exectuable: %s", UNIT(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; + + 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 exectuable: %s", UNIT(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: + 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_MAINTAINANCE); + + m->failure = false; + mount_enter_mounting(m); + return 0; +} + +static int mount_stop(Unit *u) { + Mount *m = MOUNT(u); + + assert(m); + + /* Cann't do this right now. */ + if (m->state == MOUNT_MOUNTING || + m->state == MOUNT_MOUNTING_DONE || + m->state == MOUNT_MOUNTING_SIGTERM || + m->state == MOUNT_MOUNTING_SIGKILL || + m->state == MOUNT_REMOUNTING || + m->state == MOUNT_REMOUNTING_SIGTERM || + m->state == MOUNT_REMOUNTING_SIGKILL) + return -EAGAIN; + + /* Already on it */ + if (m->state == MOUNT_UNMOUNTING || + m->state == MOUNT_UNMOUNTING_SIGKILL || + m->state == MOUNT_UNMOUNTING_SIGTERM) + return 0; + + assert(m->state == MOUNT_MOUNTED); + + 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", "%u", (unsigned) 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); + int r; + + assert(u); + assert(key); + assert(value); + assert(fds); + + if (streq(key, "state")) { + MountState state; + + if ((state = mount_state_from_string(value)) < 0) + log_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")) { + unsigned pid; + + if ((r = safe_atou(value, &pid)) < 0 || pid <= 0) + log_debug("Failed to parse control-pid value %s", value); + else + m->control_pid = (pid_t) 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); + + success = is_clean_exit(code, status); + m->failure = m->failure || !success; + + assert(m->control_pid == pid); + m->control_pid = 0; + + if (m->control_command) { + exec_status_fill(&m->control_command->exec_status, pid, code, status); + m->control_command = NULL; + m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; + } + + log_debug("%s control 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 && m->from_proc_self_mountinfo) + 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."); + } +} + +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; + int r; + + /* FIXME: to follow udev's logic 100% we need to leave valid + * UTF8 chars unescaped */ + + if (startswith(p, "LABEL=")) { + + if (!(t = xescape(p+6, "/ "))) + 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 (!(t = xescape(p+5, "/ "))) + 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, *fstype, *d, *p; + + assert(m); + + rewind(m->proc_self_mountinfo); + + for (;;) { + int k; + + device = path = options = fstype = d = p = 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 */ + "%*[^\n]", /* some rubbish at the end */ + &path, + &options, + &fstype, + &device)) != 4) { + + if (k == EOF) + break; + + r = -EBADMSG; + goto finish; + } + + if (!(d = cunescape(device)) || + !(p = cunescape(path))) { + r = -ENOMEM; + goto finish; + } + + if ((r = mount_add_one(m, d, p, options, fstype, true, set_flags)) < 0) + goto finish; + + free(device); + free(path); + free(options); + free(fstype); + free(d); + free(p); + } + + r = 0; + +finish: + free(device); + free(path); + free(options); + free(fstype); + free(d); + free(p); + + 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(errno)); + + /* 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_MAINTAINANCE: + 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; + } +} + +int mount_path_is_mounted(Manager *m, const char* path) { + char *t; + int r; + + assert(m); + assert(path); + + if (path[0] != '/') + return 1; + + if (!(t = strdup(path))) + return -ENOMEM; + + path_kill_slashes(t); + + for (;;) { + char *e, *slash; + Unit *u; + + if (!(e = unit_name_from_path(t, ".mount"))) { + r = -ENOMEM; + goto finish; + } + + u = manager_get_unit(m, e); + free(e); + + if (u && + (MOUNT(u)->from_etc_fstab || MOUNT(u)->from_fragment) && + MOUNT(u)->state != MOUNT_MOUNTED) { + r = 0; + goto finish; + } + + assert_se(slash = strrchr(t, '/')); + + if (slash == t) { + r = 1; + goto finish; + } + + *slash = 0; + } + + r = 1; + +finish: + free(t); + return r; +} + +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_MAINTAINANCE] = "maintainance" +}; + +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, + + .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, + + .bus_message_handler = bus_mount_message_handler, + + .enumerate = mount_enumerate, + .shutdown = mount_shutdown +}; |