-/*-*- 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

-};