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-rw-r--r--src/mount.c1929
1 files changed, 1929 insertions, 0 deletions
diff --git a/src/mount.c b/src/mount.c
new file mode 100644
index 0000000000..ed0f819c7b
--- /dev/null
+++ b/src/mount.c
@@ -0,0 +1,1929 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <stdio.h>
+#include <mntent.h>
+#include <sys/epoll.h>
+#include <signal.h>
+
+#include "unit.h"
+#include "mount.h"
+#include "load-fragment.h"
+#include "load-dropin.h"
+#include "log.h"
+#include "strv.h"
+#include "mount-setup.h"
+#include "unit-name.h"
+#include "dbus-mount.h"
+#include "special.h"
+#include "bus-errors.h"
+#include "exit-status.h"
+#include "def.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_FAILED] = UNIT_FAILED
+};
+
+static void mount_init(Unit *u) {
+ Mount *m = MOUNT(u);
+
+ assert(u);
+ assert(u->load_state == UNIT_STUB);
+
+ m->timeout_usec = DEFAULT_TIMEOUT_USEC;
+ m->directory_mode = 0755;
+
+ exec_context_init(&m->exec_context);
+
+ /* The stdio/kmsg bridge socket is on /, in order to avoid a
+ * dep loop, don't use kmsg logging for -.mount */
+ if (!unit_has_name(u, "-.mount")) {
+ m->exec_context.std_output = u->manager->default_std_output;
+ m->exec_context.std_error = u->manager->default_std_error;
+ }
+
+ /* 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;
+
+ UNIT(m)->ignore_on_isolate = true;
+}
+
+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 MountParameters* get_mount_parameters_configured(Mount *m) {
+ assert(m);
+
+ if (m->from_fragment)
+ return &m->parameters_fragment;
+ else if (m->from_etc_fstab)
+ return &m->parameters_etc_fstab;
+
+ return NULL;
+}
+
+static MountParameters* get_mount_parameters(Mount *m) {
+ assert(m);
+
+ if (m->from_proc_self_mountinfo)
+ return &m->parameters_proc_self_mountinfo;
+
+ return get_mount_parameters_configured(m);
+}
+
+static int mount_add_mount_links(Mount *m) {
+ Unit *other;
+ int r;
+ MountParameters *pm;
+
+ assert(m);
+
+ pm = get_mount_parameters_configured(m);
+
+ /* Adds in links to other mount points that might lie below or
+ * above us in the hierarchy */
+
+ LIST_FOREACH(units_by_type, other, UNIT(m)->manager->units_by_type[UNIT_MOUNT]) {
+ Mount *n = MOUNT(other);
+ MountParameters *pn;
+
+ if (n == m)
+ continue;
+
+ if (UNIT(n)->load_state != UNIT_LOADED)
+ continue;
+
+ pn = get_mount_parameters_configured(n);
+
+ if (path_startswith(m->where, n->where)) {
+
+ if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
+ return r;
+
+ if (pn)
+ 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(n), UNIT_AFTER, UNIT(m), true)) < 0)
+ return r;
+
+ if (pm)
+ if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
+ return r;
+
+ } else if (pm && pm->what && path_startswith(pm->what, n->where)) {
+
+ if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
+ return r;
+
+ if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
+ return r;
+
+ } else if (pn && pn->what && path_startswith(pn->what, m->where)) {
+
+ if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
+ return r;
+
+ 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) {
+ Unit *other;
+ int r;
+
+ assert(m);
+
+ LIST_FOREACH(units_by_type, other, UNIT(m)->manager->units_by_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) {
+ Unit *other;
+ int r;
+
+ assert(m);
+
+ LIST_FOREACH(units_by_type, other, UNIT(m)->manager->units_by_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) {
+ Unit *other;
+ int r;
+
+ assert(m);
+
+ LIST_FOREACH(units_by_type, other, UNIT(m)->manager->units_by_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) {
+ Unit *other;
+ int r;
+
+ assert(m);
+
+ LIST_FOREACH(units_by_type, other, UNIT(m)->manager->units_by_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 NULL;
+
+ zero(me);
+ me.mnt_opts = (char*) haystack;
+
+ return hasmntopt(&me, needle);
+}
+
+static bool mount_is_network(MountParameters *p) {
+ assert(p);
+
+ if (mount_test_option(p->options, "_netdev"))
+ return true;
+
+ if (p->fstype && fstype_is_network(p->fstype))
+ return true;
+
+ return false;
+}
+
+static bool mount_is_bind(MountParameters *p) {
+ assert(p);
+
+ if (mount_test_option(p->options, "bind"))
+ return true;
+
+ if (p->fstype && streq(p->fstype, "bind"))
+ return true;
+
+ return false;
+}
+
+static bool needs_quota(MountParameters *p) {
+ assert(p);
+
+ if (mount_is_network(p))
+ return false;
+
+ if (mount_is_bind(p))
+ return false;
+
+ return mount_test_option(p->options, "usrquota") ||
+ mount_test_option(p->options, "grpquota") ||
+ mount_test_option(p->options, "quota") ||
+ mount_test_option(p->options, "usrjquota") ||
+ mount_test_option(p->options, "grpjquota");
+}
+
+static int mount_add_fstab_links(Mount *m) {
+ const char *target, *after, *tu_wants = NULL;
+ MountParameters *p;
+ Unit *tu;
+ int r;
+ bool noauto, nofail, handle, automount;
+
+ assert(m);
+
+ if (UNIT(m)->manager->running_as != MANAGER_SYSTEM)
+ return 0;
+
+ if (!(p = get_mount_parameters_configured(m)))
+ return 0;
+
+ if (p != &m->parameters_etc_fstab)
+ return 0;
+
+ noauto = !!mount_test_option(p->options, "noauto");
+ nofail = !!mount_test_option(p->options, "nofail");
+ automount =
+ mount_test_option(p->options, "comment=systemd.automount") ||
+ mount_test_option(p->options, "x-systemd-automount");
+ handle =
+ automount ||
+ mount_test_option(p->options, "comment=systemd.mount") ||
+ mount_test_option(p->options, "x-systemd-mount") ||
+ UNIT(m)->manager->mount_auto;
+
+ if (mount_is_network(p)) {
+ target = SPECIAL_REMOTE_FS_TARGET;
+ after = tu_wants = SPECIAL_REMOTE_FS_PRE_TARGET;
+ } else {
+ target = SPECIAL_LOCAL_FS_TARGET;
+ after = SPECIAL_LOCAL_FS_PRE_TARGET;
+ }
+
+ r = manager_load_unit(UNIT(m)->manager, target, NULL, NULL, &tu);
+ if (r < 0)
+ return r;
+
+ if (tu_wants) {
+ r = unit_add_dependency_by_name(tu, UNIT_WANTS, tu_wants, NULL, true);
+ if (r < 0)
+ return r;
+ }
+
+ if (after) {
+ r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, NULL, true);
+ if (r < 0)
+ return r;
+ }
+
+ if (automount) {
+ Unit *am;
+
+ if ((r = unit_load_related_unit(UNIT(m), ".automount", &am)) < 0)
+ return r;
+
+ /* If auto is configured as well also pull in the
+ * mount right-away, but don't rely on it. */
+ if (!noauto) /* automount + auto */
+ if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true)) < 0)
+ return r;
+
+ /* Install automount unit */
+ if (!nofail) /* automount + fail */
+ return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_REQUIRES, am, true);
+ else /* automount + nofail */
+ return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_WANTS, am, true);
+
+ } else if (handle && !noauto) {
+
+ /* Automatically add mount points that aren't natively
+ * configured to local-fs.target */
+
+ if (!nofail) /* auto + fail */
+ return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true);
+ else /* auto + nofail */
+ return unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true);
+ }
+
+ return 0;
+}
+
+static int mount_add_device_links(Mount *m) {
+ MountParameters *p;
+ int r;
+
+ assert(m);
+
+ if (!(p = get_mount_parameters_configured(m)))
+ return 0;
+
+ if (!p->what)
+ return 0;
+
+ if (!mount_is_bind(p) &&
+ !path_equal(m->where, "/") &&
+ p == &m->parameters_etc_fstab) {
+ bool nofail, noauto;
+
+ noauto = !!mount_test_option(p->options, "noauto");
+ nofail = !!mount_test_option(p->options, "nofail");
+
+ if ((r = unit_add_node_link(UNIT(m), p->what,
+ !noauto && nofail &&
+ UNIT(m)->manager->running_as == MANAGER_SYSTEM)) < 0)
+ return r;
+ }
+
+ if (p->passno > 0 &&
+ !mount_is_bind(p) &&
+ UNIT(m)->manager->running_as == MANAGER_SYSTEM &&
+ !path_equal(m->where, "/")) {
+ char *name;
+ Unit *fsck;
+ /* Let's add in the fsck service */
+
+ /* aka SPECIAL_FSCK_SERVICE */
+ if (!(name = unit_name_from_path_instance("fsck", p->what, ".service")))
+ return -ENOMEM;
+
+ if ((r = manager_load_unit_prepare(UNIT(m)->manager, name, NULL, NULL, &fsck)) < 0) {
+ log_warning("Failed to prepare unit %s: %s", name, strerror(-r));
+ free(name);
+ return r;
+ }
+
+ free(name);
+
+ SERVICE(fsck)->fsck_passno = p->passno;
+
+ if ((r = unit_add_two_dependencies(UNIT(m), UNIT_AFTER, UNIT_REQUIRES, fsck, true)) < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+static int mount_add_default_dependencies(Mount *m) {
+ int r;
+ MountParameters *p;
+
+ assert(m);
+
+ if (UNIT(m)->manager->running_as != MANAGER_SYSTEM)
+ return 0;
+
+ p = get_mount_parameters_configured(m);
+ if (p && needs_quota(p)) {
+ if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, NULL, true)) < 0 ||
+ (r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, NULL, true)) < 0)
+ return r;
+ }
+
+ if (!path_equal(m->where, "/"))
+ if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
+ return r;
+
+ return 0;
+}
+
+static int mount_fix_timeouts(Mount *m) {
+ MountParameters *p;
+ const char *timeout = NULL;
+ Unit *other;
+ Iterator i;
+ usec_t u;
+ char *t;
+ int r;
+
+ assert(m);
+
+ if (!(p = get_mount_parameters_configured(m)))
+ return 0;
+
+ /* Allow configuration how long we wait for a device that
+ * backs a mount point to show up. This is useful to support
+ * endless device timeouts for devices that show up only after
+ * user input, like crypto devices. */
+
+ if ((timeout = mount_test_option(p->options, "comment=systemd.device-timeout")))
+ timeout += 31;
+ else if ((timeout = mount_test_option(p->options, "x-systemd-device-timeout")))
+ timeout += 25;
+ else
+ return 0;
+
+ t = strndup(timeout, strcspn(timeout, ",;" WHITESPACE));
+ if (!t)
+ return -ENOMEM;
+
+ r = parse_usec(t, &u);
+ free(t);
+
+ if (r < 0) {
+ log_warning("Failed to parse timeout for %s, ignoring: %s", m->where, timeout);
+ return r;
+ }
+
+ SET_FOREACH(other, UNIT(m)->dependencies[UNIT_AFTER], i) {
+ if (other->type != UNIT_DEVICE)
+ continue;
+
+ other->job_timeout = u;
+ }
+
+ return 0;
+}
+
+static int mount_verify(Mount *m) {
+ bool b;
+ char *e;
+ assert(m);
+
+ if (UNIT(m)->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.", UNIT(m)->id);
+ return -EINVAL;
+ }
+
+ if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
+ log_error("Cannot create mount unit for API file system %s. Refusing.", m->where);
+ return -EINVAL;
+ }
+
+ if (UNIT(m)->fragment_path && !m->parameters_fragment.what) {
+ log_error("%s's What setting is missing. Refusing.", UNIT(m)->id);
+ return -EBADMSG;
+ }
+
+ if (m->exec_context.pam_name && m->exec_context.kill_mode != KILL_CONTROL_GROUP) {
+ log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", UNIT(m)->id);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int mount_load(Unit *u) {
+ Mount *m = MOUNT(u);
+ int r;
+
+ assert(u);
+ assert(u->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->load_state == UNIT_LOADED) {
+ if ((r = unit_add_exec_dependencies(u, &m->exec_context)) < 0)
+ return r;
+
+ if (UNIT(m)->fragment_path)
+ m->from_fragment = true;
+ else if (m->from_etc_fstab)
+ /* We always add several default dependencies to fstab mounts,
+ * but we do not want the implicit complementing of Wants= with After=
+ * in the target unit that this mount unit will be hooked into. */
+ UNIT(m)->default_dependencies = false;
+
+ if (!m->where)
+ if (!(m->where = unit_name_to_path(u->id)))
+ return -ENOMEM;
+
+ path_kill_slashes(m->where);
+
+ if (!UNIT(m)->description)
+ if ((r = unit_set_description(u, m->where)) < 0)
+ return r;
+
+ if ((r = mount_add_device_links(m)) < 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_fstab_links(m)) < 0)
+ return r;
+
+ if (UNIT(m)->default_dependencies || m->from_etc_fstab)
+ if ((r = mount_add_default_dependencies(m)) < 0)
+ return r;
+
+ if ((r = unit_add_default_cgroups(u)) < 0)
+ return r;
+
+ mount_fix_timeouts(m);
+ }
+
+ return mount_verify(m);
+}
+
+static int mount_notify_automount(Mount *m, int status) {
+ Unit *p;
+ int r;
+ Iterator i;
+
+ assert(m);
+
+ SET_FOREACH(p, UNIT(m)->dependencies[UNIT_TRIGGERED_BY], i)
+ if (p->type == UNIT_AUTOMOUNT) {
+ r = automount_send_ready(AUTOMOUNT(p), status);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+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_FAILED)
+ mount_notify_automount(m, -ENODEV);
+
+ if (state != old_state)
+ log_debug("%s changed %s -> %s",
+ UNIT(m)->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], m->reload_result == MOUNT_SUCCESS);
+ m->reload_result = MOUNT_SUCCESS;
+}
+
+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);
+
+ p = get_mount_parameters(m);
+
+ fprintf(f,
+ "%sMount State: %s\n"
+ "%sResult: %s\n"
+ "%sWhere: %s\n"
+ "%sWhat: %s\n"
+ "%sFile System Type: %s\n"
+ "%sOptions: %s\n"
+ "%sFrom /etc/fstab: %s\n"
+ "%sFrom /proc/self/mountinfo: %s\n"
+ "%sFrom fragment: %s\n"
+ "%sDirectoryMode: %04o\n",
+ prefix, mount_state_to_string(m->state),
+ prefix, mount_result_to_string(m->result),
+ prefix, m->where,
+ prefix, strna(p->what),
+ prefix, strna(p->fstype),
+ prefix, strna(p->options),
+ prefix, yes_no(m->from_etc_fstab),
+ prefix, yes_no(m->from_proc_self_mountinfo),
+ prefix, yes_no(m->from_fragment),
+ prefix, m->directory_mode);
+
+ if (m->control_pid > 0)
+ fprintf(f,
+ "%sControl PID: %lu\n",
+ prefix, (unsigned long) m->control_pid);
+
+ exec_context_dump(&m->exec_context, f, prefix);
+}
+
+static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
+ pid_t pid;
+ int r;
+
+ assert(m);
+ assert(c);
+ assert(_pid);
+
+ if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
+ goto fail;
+
+ if ((r = exec_spawn(c,
+ NULL,
+ &m->exec_context,
+ NULL, 0,
+ UNIT(m)->manager->environment,
+ true,
+ true,
+ true,
+ UNIT(m)->manager->confirm_spawn,
+ UNIT(m)->cgroup_bondings,
+ UNIT(m)->cgroup_attributes,
+ &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, MountResult f) {
+ assert(m);
+
+ if (f != MOUNT_SUCCESS)
+ m->result = f;
+
+ mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD);
+}
+
+static void mount_enter_mounted(Mount *m, MountResult f) {
+ assert(m);
+
+ if (f != MOUNT_SUCCESS)
+ m->result = f;
+
+ mount_set_state(m, MOUNT_MOUNTED);
+}
+
+static void mount_enter_signal(Mount *m, MountState state, MountResult f) {
+ int r;
+ Set *pid_set = NULL;
+ bool wait_for_exit = false;
+
+ assert(m);
+
+ if (f != MOUNT_SUCCESS)
+ m->result = f;
+
+ if (m->exec_context.kill_mode != KILL_NONE) {
+ int sig = (state == MOUNT_MOUNTING_SIGTERM ||
+ state == MOUNT_UNMOUNTING_SIGTERM ||
+ state == MOUNT_REMOUNTING_SIGTERM) ? m->exec_context.kill_signal : SIGKILL;
+
+ if (m->control_pid > 0) {
+ if (kill_and_sigcont(m->control_pid, sig) < 0 && errno != ESRCH)
+
+ log_warning("Failed to kill control process %li: %m", (long) m->control_pid);
+ else
+ wait_for_exit = true;
+ }
+
+ if (m->exec_context.kill_mode == KILL_CONTROL_GROUP) {
+
+ if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ /* Exclude the control pid from being killed via the cgroup */
+ if (m->control_pid > 0)
+ if ((r = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0)
+ goto fail;
+
+ if ((r = cgroup_bonding_kill_list(UNIT(m)->cgroup_bondings, sig, true, pid_set)) < 0) {
+ if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
+ log_warning("Failed to kill control group: %s", strerror(-r));
+ } else if (r > 0)
+ wait_for_exit = true;
+
+ set_free(pid_set);
+ pid_set = NULL;
+ }
+ }
+
+ if (wait_for_exit) {
+ 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, MOUNT_SUCCESS);
+ else
+ mount_enter_dead(m, MOUNT_SUCCESS);
+
+ return;
+
+fail:
+ log_warning("%s failed to kill processes: %s", UNIT(m)->id, strerror(-r));
+
+ if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
+ mount_enter_mounted(m, MOUNT_FAILURE_RESOURCES);
+ else
+ mount_enter_dead(m, MOUNT_FAILURE_RESOURCES);
+
+ if (pid_set)
+ set_free(pid_set);
+}
+
+static void mount_enter_unmounting(Mount *m) {
+ int r;
+
+ assert(m);
+
+ 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", UNIT(m)->id, strerror(-r));
+ mount_enter_mounted(m, MOUNT_FAILURE_RESOURCES);
+}
+
+static void mount_enter_mounting(Mount *m) {
+ int r;
+ MountParameters *p;
+
+ 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);
+
+ /* Create the source directory for bind-mounts if needed */
+ p = get_mount_parameters_configured(m);
+ if (p && mount_is_bind(p))
+ mkdir_p(p->what, 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.fstype : "auto",
+ 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", UNIT(m)->id, strerror(-r));
+ mount_enter_dead(m, MOUNT_FAILURE_RESOURCES);
+}
+
+static void mount_enter_mounting_done(Mount *m) {
+ assert(m);
+
+ mount_set_state(m, MOUNT_MOUNTING_DONE);
+}
+
+static void mount_enter_remounting(Mount *m) {
+ int r;
+
+ assert(m);
+
+ 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 ? m->parameters_fragment.fstype : "auto",
+ "-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)
+ goto fail;
+
+ mount_unwatch_control_pid(m);
+
+ if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
+ goto fail;
+
+ mount_set_state(m, MOUNT_REMOUNTING);
+
+ return;
+
+fail:
+ log_warning("%s failed to run 'remount' task: %s", UNIT(m)->id, strerror(-r));
+ m->reload_result = MOUNT_FAILURE_RESOURCES;
+ mount_enter_mounted(m, MOUNT_SUCCESS);
+}
+
+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 ||
+ m->state == MOUNT_MOUNTING_SIGTERM ||
+ m->state == MOUNT_MOUNTING_SIGKILL)
+ return -EAGAIN;
+
+ /* Already on it! */
+ if (m->state == MOUNT_MOUNTING)
+ return 0;
+
+ assert(m->state == MOUNT_DEAD || m->state == MOUNT_FAILED);
+
+ m->result = MOUNT_SUCCESS;
+ m->reload_result = MOUNT_SUCCESS;
+
+ mount_enter_mounting(m);
+ return 0;
+}
+
+static int mount_stop(Unit *u) {
+ Mount *m = MOUNT(u);
+
+ assert(m);
+
+ /* Already on it */
+ if (m->state == MOUNT_UNMOUNTING ||
+ m->state == MOUNT_UNMOUNTING_SIGKILL ||
+ m->state == MOUNT_UNMOUNTING_SIGTERM ||
+ m->state == MOUNT_MOUNTING_SIGTERM ||
+ m->state == MOUNT_MOUNTING_SIGKILL)
+ return 0;
+
+ assert(m->state == MOUNT_MOUNTING ||
+ m->state == MOUNT_MOUNTING_DONE ||
+ m->state == MOUNT_MOUNTED ||
+ m->state == MOUNT_REMOUNTING ||
+ m->state == MOUNT_REMOUNTING_SIGTERM ||
+ m->state == MOUNT_REMOUNTING_SIGKILL);
+
+ mount_enter_unmounting(m);
+ 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);
+ 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, "result", mount_result_to_string(m->result));
+ unit_serialize_item(u, f, "reload-result", mount_result_to_string(m->reload_result));
+
+ if (m->control_pid > 0)
+ unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) m->control_pid);
+
+ if (m->control_command_id >= 0)
+ unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id));
+
+ return 0;
+}
+
+static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
+ Mount *m = MOUNT(u);
+
+ assert(u);
+ assert(key);
+ assert(value);
+ assert(fds);
+
+ if (streq(key, "state")) {
+ MountState state;
+
+ if ((state = mount_state_from_string(value)) < 0)
+ log_debug("Failed to parse state value %s", value);
+ else
+ m->deserialized_state = state;
+ } else if (streq(key, "result")) {
+ MountResult f;
+
+ f = mount_result_from_string(value);
+ if (f < 0)
+ log_debug("Failed to parse result value %s", value);
+ else if (f != MOUNT_SUCCESS)
+ m->result = f;
+
+ } else if (streq(key, "reload-result")) {
+ MountResult f;
+
+ f = mount_result_from_string(value);
+ if (f < 0)
+ log_debug("Failed to parse reload result value %s", value);
+ else if (f != MOUNT_SUCCESS)
+ m->reload_result = f;
+
+ } else if (streq(key, "control-pid")) {
+ pid_t pid;
+
+ if (parse_pid(value, &pid) < 0)
+ log_debug("Failed to parse control-pid value %s", value);
+ else
+ m->control_pid = pid;
+ } else if (streq(key, "control-command")) {
+ MountExecCommand id;
+
+ if ((id = mount_exec_command_from_string(value)) < 0)
+ log_debug("Failed to parse exec-command value %s", value);
+ else {
+ m->control_command_id = id;
+ m->control_command = m->exec_command + id;
+ }
+
+ } else
+ log_debug("Unknown serialization key '%s'", key);
+
+ return 0;
+}
+
+static UnitActiveState mount_active_state(Unit *u) {
+ assert(u);
+
+ return state_translation_table[MOUNT(u)->state];
+}
+
+static const char *mount_sub_state_to_string(Unit *u) {
+ assert(u);
+
+ return mount_state_to_string(MOUNT(u)->state);
+}
+
+static bool mount_check_gc(Unit *u) {
+ Mount *m = MOUNT(u);
+
+ assert(m);
+
+ return m->from_etc_fstab || m->from_proc_self_mountinfo;
+}
+
+static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
+ Mount *m = MOUNT(u);
+ MountResult f;
+
+ assert(m);
+ assert(pid >= 0);
+
+ if (pid != m->control_pid)
+ return;
+
+ m->control_pid = 0;
+
+ if (is_clean_exit(code, status))
+ f = MOUNT_SUCCESS;
+ else if (code == CLD_EXITED)
+ f = MOUNT_FAILURE_EXIT_CODE;
+ else if (code == CLD_KILLED)
+ f = MOUNT_FAILURE_SIGNAL;
+ else if (code == CLD_DUMPED)
+ f = MOUNT_FAILURE_CORE_DUMP;
+ else
+ assert_not_reached("Unknown code");
+
+ if (f != MOUNT_SUCCESS)
+ m->result = f;
+
+ if (m->control_command) {
+ exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status);
+
+ m->control_command = NULL;
+ m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
+ }
+
+ log_full(f == MOUNT_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
+ "%s mount process exited, code=%s status=%i", u->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:
+
+ if (f == MOUNT_SUCCESS)
+ mount_enter_mounted(m, f);
+ else if (m->from_proc_self_mountinfo)
+ mount_enter_mounted(m, f);
+ else
+ mount_enter_dead(m, f);
+ break;
+
+ case MOUNT_REMOUNTING:
+ case MOUNT_REMOUNTING_SIGKILL:
+ case MOUNT_REMOUNTING_SIGTERM:
+
+ m->reload_result = f;
+ if (m->from_proc_self_mountinfo)
+ mount_enter_mounted(m, MOUNT_SUCCESS);
+ else
+ mount_enter_dead(m, MOUNT_SUCCESS);
+
+ break;
+
+ case MOUNT_UNMOUNTING:
+ case MOUNT_UNMOUNTING_SIGKILL:
+ case MOUNT_UNMOUNTING_SIGTERM:
+
+ if (f == MOUNT_SUCCESS)
+ mount_enter_dead(m, f);
+ else if (m->from_proc_self_mountinfo)
+ mount_enter_mounted(m, f);
+ else
+ mount_enter_dead(m, f);
+ break;
+
+ default:
+ assert_not_reached("Uh, control process died at wrong time.");
+ }
+
+ /* Notify clients about changed exit status */
+ unit_add_to_dbus_queue(u);
+}
+
+static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
+ Mount *m = MOUNT(u);
+
+ assert(m);
+ assert(elapsed == 1);
+ assert(w == &m->timer_watch);
+
+ switch (m->state) {
+
+ case MOUNT_MOUNTING:
+ case MOUNT_MOUNTING_DONE:
+ log_warning("%s mounting timed out. Stopping.", u->id);
+ mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
+ break;
+
+ case MOUNT_REMOUNTING:
+ log_warning("%s remounting timed out. Stopping.", u->id);
+ m->reload_result = MOUNT_FAILURE_TIMEOUT;
+ mount_enter_mounted(m, MOUNT_SUCCESS);
+ break;
+
+ case MOUNT_UNMOUNTING:
+ log_warning("%s unmounting timed out. Stopping.", u->id);
+ mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
+ break;
+
+ case MOUNT_MOUNTING_SIGTERM:
+ if (m->exec_context.send_sigkill) {
+ log_warning("%s mounting timed out. Killing.", u->id);
+ mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
+ } else {
+ log_warning("%s mounting timed out. Skipping SIGKILL. Ignoring.", u->id);
+
+ if (m->from_proc_self_mountinfo)
+ mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
+ else
+ mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
+ }
+ break;
+
+ case MOUNT_REMOUNTING_SIGTERM:
+ if (m->exec_context.send_sigkill) {
+ log_warning("%s remounting timed out. Killing.", u->id);
+ mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
+ } else {
+ log_warning("%s remounting timed out. Skipping SIGKILL. Ignoring.", u->id);
+
+ if (m->from_proc_self_mountinfo)
+ mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
+ else
+ mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
+ }
+ break;
+
+ case MOUNT_UNMOUNTING_SIGTERM:
+ if (m->exec_context.send_sigkill) {
+ log_warning("%s unmounting timed out. Killing.", u->id);
+ mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
+ } else {
+ log_warning("%s unmounting timed out. Skipping SIGKILL. Ignoring.", u->id);
+
+ if (m->from_proc_self_mountinfo)
+ mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
+ else
+ mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
+ }
+ break;
+
+ case MOUNT_MOUNTING_SIGKILL:
+ case MOUNT_REMOUNTING_SIGKILL:
+ case MOUNT_UNMOUNTING_SIGKILL:
+ log_warning("%s mount process still around after SIGKILL. Ignoring.", u->id);
+
+ if (m->from_proc_self_mountinfo)
+ mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
+ else
+ mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
+ 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,
+ int passno,
+ 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) || mount_point_ignore(where))
+ return 0;
+
+ if (streq(fstype, "autofs"))
+ return 0;
+
+ /* probably some kind of swap, ignore */
+ if (!is_path(where))
+ return 0;
+
+ e = unit_name_from_path(where, ".mount");
+ if (!e)
+ return -ENOMEM;
+
+ u = manager_get_unit(m, e);
+ if (!u) {
+ delete = true;
+
+ u = unit_new(m, sizeof(Mount));
+ if (!u) {
+ free(e);
+ return -ENOMEM;
+ }
+
+ r = unit_add_name(u, e);
+ free(e);
+
+ if (r < 0)
+ goto fail;
+
+ MOUNT(u)->where = strdup(where);
+ if (!MOUNT(u)->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;
+
+ p->passno = passno;
+
+ unit_add_to_dbus_queue(u);
+
+ return 0;
+
+fail:
+ free(w);
+ free(o);
+ free(f);
+
+ if (delete && u)
+ unit_free(u);
+
+ return r;
+}
+
+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 = 0;
+ struct mntent* me;
+
+ assert(m);
+
+ errno = 0;
+ if (!(f = setmntent("/etc/fstab", "r")))
+ return -errno;
+
+ while ((me = getmntent(f))) {
+ char *where, *what;
+ int k;
+
+ 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)
+ k = pri;
+ else
+ k = swap_add_one(m,
+ what,
+ NULL,
+ pri,
+ !!mount_test_option(me->mnt_opts, "noauto"),
+ !!mount_test_option(me->mnt_opts, "nofail"),
+ !!mount_test_option(me->mnt_opts, "comment=systemd.swapon"),
+ false);
+ } else
+ k = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, me->mnt_passno, false, false);
+
+ free(what);
+ free(where);
+
+ if (k < 0)
+ r = k;
+ }
+
+finish:
+
+ endmntent(f);
+ return r;
+}
+
+static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
+ int r = 0;
+ unsigned i;
+ char *device, *path, *options, *options2, *fstype, *d, *p, *o;
+
+ assert(m);
+
+ rewind(m->proc_self_mountinfo);
+
+ for (i = 1;; i++) {
+ 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) separator */
+ "%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;
+
+ log_warning("Failed to parse /proc/self/mountinfo:%u.", i);
+ goto clean_up;
+ }
+
+ if (asprintf(&o, "%s,%s", options, options2) < 0) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ if (!(d = cunescape(device)) ||
+ !(p = cunescape(path))) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ if ((k = mount_add_one(m, d, p, o, fstype, 0, true, set_flags)) < 0)
+ r = k;
+
+clean_up:
+ free(device);
+ free(path);
+ free(options);
+ free(options2);
+ free(fstype);
+ free(d);
+ free(p);
+ free(o);
+ }
+
+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 = EPOLLPRI;
+ 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) {
+ Unit *u;
+ int r;
+
+ assert(m);
+ assert(events & EPOLLPRI);
+
+ /* The manager calls this for every fd event happening on the
+ * /proc/self/mountinfo file, which informs us about mounting
+ * table changes */
+
+ if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
+ log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-r));
+
+ /* Reset flags, just in case, for later calls */
+ LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
+ Mount *mount = MOUNT(u);
+
+ mount->is_mounted = mount->just_mounted = mount->just_changed = false;
+ }
+
+ return;
+ }
+
+ manager_dispatch_load_queue(m);
+
+ LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
+ Mount *mount = MOUNT(u);
+
+ 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, MOUNT_SUCCESS);
+ break;
+
+ default:
+ mount_set_state(mount, mount->state);
+ break;
+
+ }
+
+ } else if (mount->just_mounted || mount->just_changed) {
+
+ /* New or changed mount entry */
+
+ switch (mount->state) {
+
+ case MOUNT_DEAD:
+ case MOUNT_FAILED:
+ mount_enter_mounted(mount, MOUNT_SUCCESS);
+ break;
+
+ case MOUNT_MOUNTING:
+ mount_enter_mounting_done(mount);
+ break;
+
+ default:
+ /* Nothing really changed, but let's
+ * issue an notification call
+ * nonetheless, in case somebody is
+ * waiting for this. (e.g. file system
+ * ro/rw remounts.) */
+ mount_set_state(mount, mount->state);
+ break;
+ }
+ }
+
+ /* Reset the flags for later calls */
+ mount->is_mounted = mount->just_mounted = mount->just_changed = false;
+ }
+}
+
+static void mount_reset_failed(Unit *u) {
+ Mount *m = MOUNT(u);
+
+ assert(m);
+
+ if (m->state == MOUNT_FAILED)
+ mount_set_state(m, MOUNT_DEAD);
+
+ m->result = MOUNT_SUCCESS;
+ m->reload_result = MOUNT_SUCCESS;
+}
+
+static int mount_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
+ Mount *m = MOUNT(u);
+ int r = 0;
+ Set *pid_set = NULL;
+
+ assert(m);
+
+ if (who == KILL_MAIN) {
+ dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Mount units have no main processes");
+ return -ESRCH;
+ }
+
+ if (m->control_pid <= 0 && who == KILL_CONTROL) {
+ dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
+ return -ESRCH;
+ }
+
+ if (who == KILL_CONTROL || who == KILL_ALL)
+ if (m->control_pid > 0)
+ if (kill(m->control_pid, signo) < 0)
+ r = -errno;
+
+ if (who == KILL_ALL && mode == KILL_CONTROL_GROUP) {
+ int q;
+
+ if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
+ return -ENOMEM;
+
+ /* Exclude the control pid from being killed via the cgroup */
+ if (m->control_pid > 0)
+ if ((q = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0) {
+ r = q;
+ goto finish;
+ }
+
+ if ((q = cgroup_bonding_kill_list(UNIT(m)->cgroup_bondings, signo, false, pid_set)) < 0)
+ if (q != -EAGAIN && q != -ESRCH && q != -ENOENT)
+ r = q;
+ }
+
+finish:
+ if (pid_set)
+ set_free(pid_set);
+
+ 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_FAILED] = "failed"
+};
+
+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);
+
+static const char* const mount_result_table[_MOUNT_RESULT_MAX] = {
+ [MOUNT_SUCCESS] = "success",
+ [MOUNT_FAILURE_RESOURCES] = "resources",
+ [MOUNT_FAILURE_TIMEOUT] = "timeout",
+ [MOUNT_FAILURE_EXIT_CODE] = "exit-code",
+ [MOUNT_FAILURE_SIGNAL] = "signal",
+ [MOUNT_FAILURE_CORE_DUMP] = "core-dump"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(mount_result, MountResult);
+
+const UnitVTable mount_vtable = {
+ .suffix = ".mount",
+ .object_size = sizeof(Mount),
+ .sections =
+ "Unit\0"
+ "Mount\0"
+ "Install\0",
+
+ .no_alias = true,
+ .no_instances = 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,
+
+ .kill = mount_kill,
+
+ .serialize = mount_serialize,
+ .deserialize_item = mount_deserialize_item,
+
+ .active_state = mount_active_state,
+ .sub_state_to_string = mount_sub_state_to_string,
+
+ .check_gc = mount_check_gc,
+
+ .sigchld_event = mount_sigchld_event,
+ .timer_event = mount_timer_event,
+
+ .reset_failed = mount_reset_failed,
+
+ .bus_interface = "org.freedesktop.systemd1.Mount",
+ .bus_message_handler = bus_mount_message_handler,
+ .bus_invalidating_properties = bus_mount_invalidating_properties,
+
+ .enumerate = mount_enumerate,
+ .shutdown = mount_shutdown
+};
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-14 06:42:49 +0000