| /*-*- 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" |
| #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; |
| exec_context_init(&m->exec_context); |
| |
| m->directory_mode = 0755; |
| |
| /* 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, &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_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->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) |
| 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; |
| } |
| |
| 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" |
| "%sKillMode: %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, kill_mode_to_string(m->kill_mode), |
| 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, |
| 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->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(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", 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: |
| 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); |
| |
| /* 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", "%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); |
| 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")) { |
| pid_t pid; |
| |
| if ((r = 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_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) |
| 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, *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(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_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; |
| } |
| } |
| |
| 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_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, |
| |
| .bus_message_handler = bus_mount_message_handler, |
| |
| .enumerate = mount_enumerate, |
| .shutdown = mount_shutdown |
| }; |