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-rw-r--r--src/core/mount.c2043
1 files changed, 2043 insertions, 0 deletions
diff --git a/src/core/mount.c b/src/core/mount.c
new file mode 100644
index 0000000..c31cad6
--- /dev/null
+++ b/src/core/mount.c
@@ -0,0 +1,2043 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <errno.h>
+#include <signal.h>
+#include <stdio.h>
+#include <sys/epoll.h>
+
+#include <libmount.h>
+
+#include "sd-messages.h"
+
+#include "alloc-util.h"
+#include "dbus-mount.h"
+#include "dbus-unit.h"
+#include "device.h"
+#include "escape.h"
+#include "exit-status.h"
+#include "format-util.h"
+#include "fstab-util.h"
+#include "log.h"
+#include "manager.h"
+#include "mkdir.h"
+#include "mount-setup.h"
+#include "mount.h"
+#include "mountpoint-util.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "process-util.h"
+#include "serialize.h"
+#include "special.h"
+#include "string-table.h"
+#include "string-util.h"
+#include "strv.h"
+#include "unit-name.h"
+#include "unit.h"
+
+#define RETRY_UMOUNT_MAX 32
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_table*, mnt_free_table);
+DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_iter*, mnt_free_iter);
+
+static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
+ [MOUNT_DEAD] = UNIT_INACTIVE,
+ [MOUNT_MOUNTING] = UNIT_ACTIVATING,
+ [MOUNT_MOUNTING_DONE] = UNIT_ACTIVATING,
+ [MOUNT_MOUNTED] = UNIT_ACTIVE,
+ [MOUNT_REMOUNTING] = UNIT_RELOADING,
+ [MOUNT_UNMOUNTING] = 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 int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
+static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
+
+static bool MOUNT_STATE_WITH_PROCESS(MountState state) {
+ return IN_SET(state,
+ MOUNT_MOUNTING,
+ MOUNT_MOUNTING_DONE,
+ MOUNT_REMOUNTING,
+ MOUNT_REMOUNTING_SIGTERM,
+ MOUNT_REMOUNTING_SIGKILL,
+ MOUNT_UNMOUNTING,
+ MOUNT_UNMOUNTING_SIGTERM,
+ MOUNT_UNMOUNTING_SIGKILL);
+}
+
+static bool mount_is_network(const MountParameters *p) {
+ assert(p);
+
+ if (fstab_test_option(p->options, "_netdev\0"))
+ return true;
+
+ if (p->fstype && fstype_is_network(p->fstype))
+ return true;
+
+ return false;
+}
+
+static bool mount_is_loop(const MountParameters *p) {
+ assert(p);
+
+ if (fstab_test_option(p->options, "loop\0"))
+ return true;
+
+ return false;
+}
+
+static bool mount_is_bind(const MountParameters *p) {
+ assert(p);
+
+ if (fstab_test_option(p->options, "bind\0" "rbind\0"))
+ return true;
+
+ if (p->fstype && STR_IN_SET(p->fstype, "bind", "rbind"))
+ return true;
+
+ return false;
+}
+
+static bool mount_is_auto(const MountParameters *p) {
+ assert(p);
+
+ return !fstab_test_option(p->options, "noauto\0");
+}
+
+static bool mount_is_automount(const MountParameters *p) {
+ assert(p);
+
+ return fstab_test_option(p->options,
+ "comment=systemd.automount\0"
+ "x-systemd.automount\0");
+}
+
+static bool mount_is_bound_to_device(const Mount *m) {
+ const MountParameters *p;
+
+ if (m->from_fragment)
+ return true;
+
+ p = &m->parameters_proc_self_mountinfo;
+ return fstab_test_option(p->options, "x-systemd.device-bound\0");
+}
+
+static bool mount_needs_quota(const MountParameters *p) {
+ assert(p);
+
+ /* Quotas are not enabled on network filesystems, but we want them, for example, on storage connected via
+ * iscsi. We hence don't use mount_is_network() here, as that would also return true for _netdev devices. */
+ if (p->fstype && fstype_is_network(p->fstype))
+ return false;
+
+ if (mount_is_bind(p))
+ return false;
+
+ return fstab_test_option(p->options,
+ "usrquota\0" "grpquota\0" "quota\0" "usrjquota\0" "grpjquota\0");
+}
+
+static void mount_init(Unit *u) {
+ Mount *m = MOUNT(u);
+
+ assert(u);
+ assert(u->load_state == UNIT_STUB);
+
+ m->timeout_usec = u->manager->default_timeout_start_usec;
+
+ m->exec_context.std_output = u->manager->default_std_output;
+ m->exec_context.std_error = u->manager->default_std_error;
+
+ m->directory_mode = 0755;
+
+ /* We need to make sure that /usr/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->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
+
+ u->ignore_on_isolate = true;
+}
+
+static int mount_arm_timer(Mount *m, usec_t usec) {
+ int r;
+
+ assert(m);
+
+ if (m->timer_event_source) {
+ r = sd_event_source_set_time(m->timer_event_source, usec);
+ if (r < 0)
+ return r;
+
+ return sd_event_source_set_enabled(m->timer_event_source, SD_EVENT_ONESHOT);
+ }
+
+ if (usec == USEC_INFINITY)
+ return 0;
+
+ r = sd_event_add_time(
+ UNIT(m)->manager->event,
+ &m->timer_event_source,
+ CLOCK_MONOTONIC,
+ usec, 0,
+ mount_dispatch_timer, m);
+ if (r < 0)
+ return r;
+
+ (void) sd_event_source_set_description(m->timer_event_source, "mount-timer");
+
+ return 0;
+}
+
+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);
+
+ p->what = mfree(p->what);
+ p->options = mfree(p->options);
+ p->fstype = mfree(p->fstype);
+}
+
+static void mount_done(Unit *u) {
+ Mount *m = MOUNT(u);
+
+ assert(m);
+
+ m->where = mfree(m->where);
+
+ mount_parameters_done(&m->parameters_proc_self_mountinfo);
+ mount_parameters_done(&m->parameters_fragment);
+
+ m->exec_runtime = exec_runtime_unref(m->exec_runtime, false);
+ exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
+ m->control_command = NULL;
+
+ dynamic_creds_unref(&m->dynamic_creds);
+
+ mount_unwatch_control_pid(m);
+
+ m->timer_event_source = sd_event_source_unref(m->timer_event_source);
+}
+
+_pure_ static MountParameters* get_mount_parameters_fragment(Mount *m) {
+ assert(m);
+
+ if (m->from_fragment)
+ return &m->parameters_fragment;
+
+ return NULL;
+}
+
+_pure_ 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_fragment(m);
+}
+
+static int update_parameters_proc_self_mount_info(
+ Mount *m,
+ const char *what,
+ const char *options,
+ const char *fstype) {
+
+ MountParameters *p;
+ int r, q, w;
+
+ p = &m->parameters_proc_self_mountinfo;
+
+ r = free_and_strdup(&p->what, what);
+ if (r < 0)
+ return r;
+
+ q = free_and_strdup(&p->options, options);
+ if (q < 0)
+ return q;
+
+ w = free_and_strdup(&p->fstype, fstype);
+ if (w < 0)
+ return w;
+
+ return r > 0 || q > 0 || w > 0;
+}
+
+static int mount_add_mount_dependencies(Mount *m) {
+ MountParameters *pm;
+ Unit *other;
+ Iterator i;
+ Set *s;
+ int r;
+
+ assert(m);
+
+ if (!path_equal(m->where, "/")) {
+ _cleanup_free_ char *parent = NULL;
+
+ /* Adds in links to other mount points that might lie further up in the hierarchy */
+
+ parent = dirname_malloc(m->where);
+ if (!parent)
+ return -ENOMEM;
+
+ r = unit_require_mounts_for(UNIT(m), parent, UNIT_DEPENDENCY_IMPLICIT);
+ if (r < 0)
+ return r;
+ }
+
+ /* Adds in dependencies to other mount points that might be needed for the source path (if this is a bind mount
+ * or a loop mount) to be available. */
+ pm = get_mount_parameters_fragment(m);
+ if (pm && pm->what &&
+ path_is_absolute(pm->what) &&
+ (mount_is_bind(pm) || mount_is_loop(pm) || !mount_is_network(pm))) {
+
+ r = unit_require_mounts_for(UNIT(m), pm->what, UNIT_DEPENDENCY_FILE);
+ if (r < 0)
+ return r;
+ }
+
+ /* Adds in dependencies to other units that use this path or paths further down in the hierarchy */
+ s = manager_get_units_requiring_mounts_for(UNIT(m)->manager, m->where);
+ SET_FOREACH(other, s, i) {
+
+ if (other->load_state != UNIT_LOADED)
+ continue;
+
+ if (other == UNIT(m))
+ continue;
+
+ r = unit_add_dependency(other, UNIT_AFTER, UNIT(m), true, UNIT_DEPENDENCY_PATH);
+ if (r < 0)
+ return r;
+
+ if (UNIT(m)->fragment_path) {
+ /* If we have fragment configuration, then make this dependency required */
+ r = unit_add_dependency(other, UNIT_REQUIRES, UNIT(m), true, UNIT_DEPENDENCY_PATH);
+ if (r < 0)
+ return r;
+ }
+ }
+
+ return 0;
+}
+
+static int mount_add_device_dependencies(Mount *m) {
+ bool device_wants_mount;
+ UnitDependencyMask mask;
+ MountParameters *p;
+ UnitDependency dep;
+ int r;
+
+ assert(m);
+
+ p = get_mount_parameters(m);
+ if (!p)
+ return 0;
+
+ if (!p->what)
+ return 0;
+
+ if (mount_is_bind(p))
+ return 0;
+
+ if (!is_device_path(p->what))
+ return 0;
+
+ /* /dev/root is a really weird thing, it's not a real device,
+ * but just a path the kernel exports for the root file system
+ * specified on the kernel command line. Ignore it here. */
+ if (path_equal(p->what, "/dev/root"))
+ return 0;
+
+ if (path_equal(m->where, "/"))
+ return 0;
+
+ device_wants_mount =
+ mount_is_auto(p) && !mount_is_automount(p) && MANAGER_IS_SYSTEM(UNIT(m)->manager);
+
+ /* Mount units from /proc/self/mountinfo are not bound to devices
+ * by default since they're subject to races when devices are
+ * unplugged. But the user can still force this dep with an
+ * appropriate option (or udev property) so the mount units are
+ * automatically stopped when the device disappears suddenly. */
+ dep = mount_is_bound_to_device(m) ? UNIT_BINDS_TO : UNIT_REQUIRES;
+
+ /* We always use 'what' from /proc/self/mountinfo if mounted */
+ mask = m->from_proc_self_mountinfo ? UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT : UNIT_DEPENDENCY_FILE;
+
+ r = unit_add_node_dependency(UNIT(m), p->what, device_wants_mount, dep, mask);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+static int mount_add_quota_dependencies(Mount *m) {
+ UnitDependencyMask mask;
+ MountParameters *p;
+ int r;
+
+ assert(m);
+
+ if (!MANAGER_IS_SYSTEM(UNIT(m)->manager))
+ return 0;
+
+ p = get_mount_parameters_fragment(m);
+ if (!p)
+ return 0;
+
+ if (!mount_needs_quota(p))
+ return 0;
+
+ mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT;
+
+ r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, true, mask);
+ if (r < 0)
+ return r;
+
+ r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, true, mask);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+static bool mount_is_extrinsic(Mount *m) {
+ MountParameters *p;
+ assert(m);
+
+ /* Returns true for all units that are "magic" and should be excluded from the usual start-up and shutdown
+ * dependencies. We call them "extrinsic" here, as they are generally mounted outside of the systemd dependency
+ * logic. We shouldn't attempt to manage them ourselves but it's fine if the user operates on them with us. */
+
+ if (!MANAGER_IS_SYSTEM(UNIT(m)->manager)) /* We only automatically manage mounts if we are in system mode */
+ return true;
+
+ if (PATH_IN_SET(m->where, /* Don't bother with the OS data itself */
+ "/",
+ "/usr"))
+ return true;
+
+ if (PATH_STARTSWITH_SET(m->where,
+ "/run/initramfs", /* This should stay around from before we boot until after we shutdown */
+ "/proc", /* All of this is API VFS */
+ "/sys", /* … dito … */
+ "/dev")) /* … dito … */
+ return true;
+
+ /* If this is an initrd mount, and we are not in the initrd, then leave this around forever, too. */
+ p = get_mount_parameters(m);
+ if (p && fstab_test_option(p->options, "x-initrd.mount\0") && !in_initrd())
+ return true;
+
+ return false;
+}
+
+static int mount_add_default_dependencies(Mount *m) {
+ const char *after, *before;
+ UnitDependencyMask mask;
+ MountParameters *p;
+ bool nofail;
+ int r;
+
+ assert(m);
+
+ if (!UNIT(m)->default_dependencies)
+ return 0;
+
+ /* We do not add any default dependencies to /, /usr or /run/initramfs/, since they are guaranteed to stay
+ * mounted the whole time, since our system is on it. Also, don't bother with anything mounted below virtual
+ * file systems, it's also going to be virtual, and hence not worth the effort. */
+ if (mount_is_extrinsic(m))
+ return 0;
+
+ p = get_mount_parameters(m);
+ if (!p)
+ return 0;
+
+ mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_DEFAULT;
+ nofail = m->from_fragment ? fstab_test_yes_no_option(m->parameters_fragment.options, "nofail\0" "fail\0") : false;
+
+ if (mount_is_network(p)) {
+ /* We order ourselves after network.target. This is
+ * primarily useful at shutdown: services that take
+ * down the network should order themselves before
+ * network.target, so that they are shut down only
+ * after this mount unit is stopped. */
+
+ r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_NETWORK_TARGET, true, mask);
+ if (r < 0)
+ return r;
+
+ /* We pull in network-online.target, and order
+ * ourselves after it. This is useful at start-up to
+ * actively pull in tools that want to be started
+ * before we start mounting network file systems, and
+ * whose purpose it is to delay this until the network
+ * is "up". */
+
+ r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_WANTS, UNIT_AFTER, SPECIAL_NETWORK_ONLINE_TARGET, true, mask);
+ if (r < 0)
+ return r;
+
+ after = SPECIAL_REMOTE_FS_PRE_TARGET;
+ before = SPECIAL_REMOTE_FS_TARGET;
+ } else {
+ after = SPECIAL_LOCAL_FS_PRE_TARGET;
+ before = SPECIAL_LOCAL_FS_TARGET;
+ }
+
+ if (!nofail) {
+ r = unit_add_dependency_by_name(UNIT(m), UNIT_BEFORE, before, true, mask);
+ if (r < 0)
+ return r;
+ }
+
+ r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, true, mask);
+ if (r < 0)
+ return r;
+
+ r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, true, mask);
+ if (r < 0)
+ return r;
+
+ /* If this is a tmpfs mount then we have to unmount it before we try to deactivate swaps */
+ if (streq_ptr(p->fstype, "tmpfs")) {
+ r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_SWAP_TARGET, true, mask);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+static int mount_verify(Mount *m) {
+ _cleanup_free_ char *e = NULL;
+ MountParameters *p;
+ int r;
+
+ assert(m);
+
+ if (UNIT(m)->load_state != UNIT_LOADED)
+ return 0;
+
+ if (!m->from_fragment && !m->from_proc_self_mountinfo && !UNIT(m)->perpetual)
+ return -ENOENT;
+
+ r = unit_name_from_path(m->where, ".mount", &e);
+ if (r < 0)
+ return log_unit_error_errno(UNIT(m), r, "Failed to generate unit name from mount path: %m");
+
+ if (!unit_has_name(UNIT(m), e)) {
+ log_unit_error(UNIT(m), "Where= setting doesn't match unit name. Refusing.");
+ return -ENOEXEC;
+ }
+
+ if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
+ log_unit_error(UNIT(m), "Cannot create mount unit for API file system %s. Refusing.", m->where);
+ return -ENOEXEC;
+ }
+
+ p = get_mount_parameters_fragment(m);
+ if (p && !p->what) {
+ log_unit_error(UNIT(m), "What= setting is missing. Refusing.");
+ return -ENOEXEC;
+ }
+
+ if (m->exec_context.pam_name && m->kill_context.kill_mode != KILL_CONTROL_GROUP) {
+ log_unit_error(UNIT(m), "Unit has PAM enabled. Kill mode must be set to control-group'. Refusing.");
+ return -ENOEXEC;
+ }
+
+ return 0;
+}
+
+static int mount_add_extras(Mount *m) {
+ Unit *u = UNIT(m);
+ int r;
+
+ assert(m);
+
+ /* Note: this call might be called after we already have been loaded once (and even when it has already been
+ * activated), in case data from /proc/self/mountinfo has changed. This means all code here needs to be ready
+ * to run with an already set up unit. */
+
+ if (u->fragment_path)
+ m->from_fragment = true;
+
+ if (!m->where) {
+ r = unit_name_to_path(u->id, &m->where);
+ if (r < 0)
+ return r;
+ }
+
+ path_simplify(m->where, false);
+
+ if (!u->description) {
+ r = unit_set_description(u, m->where);
+ if (r < 0)
+ return r;
+ }
+
+ r = mount_add_device_dependencies(m);
+ if (r < 0)
+ return r;
+
+ r = mount_add_mount_dependencies(m);
+ if (r < 0)
+ return r;
+
+ r = mount_add_quota_dependencies(m);
+ if (r < 0)
+ return r;
+
+ r = unit_patch_contexts(u);
+ if (r < 0)
+ return r;
+
+ r = unit_add_exec_dependencies(u, &m->exec_context);
+ if (r < 0)
+ return r;
+
+ r = unit_set_default_slice(u);
+ if (r < 0)
+ return r;
+
+ r = mount_add_default_dependencies(m);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+static int mount_load_root_mount(Unit *u) {
+ assert(u);
+
+ if (!unit_has_name(u, SPECIAL_ROOT_MOUNT))
+ return 0;
+
+ u->perpetual = true;
+ u->default_dependencies = false;
+
+ /* The stdio/kmsg bridge socket is on /, in order to avoid a dep loop, don't use kmsg logging for -.mount */
+ MOUNT(u)->exec_context.std_output = EXEC_OUTPUT_NULL;
+ MOUNT(u)->exec_context.std_input = EXEC_INPUT_NULL;
+
+ if (!u->description)
+ u->description = strdup("Root Mount");
+
+ return 1;
+}
+
+static int mount_load(Unit *u) {
+ Mount *m = MOUNT(u);
+ int r, q, w;
+
+ assert(u);
+ assert(u->load_state == UNIT_STUB);
+
+ r = mount_load_root_mount(u);
+
+ if (m->from_proc_self_mountinfo || u->perpetual)
+ q = unit_load_fragment_and_dropin_optional(u);
+ else
+ q = unit_load_fragment_and_dropin(u);
+
+ /* Add in some extras. Note we do this in all cases (even if we failed to load the unit) when announced by the
+ * kernel, because we need some things to be set up no matter what when the kernel establishes a mount and thus
+ * we need to update the state in our unit to track it. After all, consider that we don't allow changing the
+ * 'slice' field for a unit once it is active. */
+ if (u->load_state == UNIT_LOADED || m->from_proc_self_mountinfo || u->perpetual)
+ w = mount_add_extras(m);
+ else
+ w = 0;
+
+ if (r < 0)
+ return r;
+ if (q < 0)
+ return q;
+ if (w < 0)
+ return w;
+
+ return mount_verify(m);
+}
+
+static void mount_set_state(Mount *m, MountState state) {
+ MountState old_state;
+ assert(m);
+
+ if (m->state != state)
+ bus_unit_send_pending_change_signal(UNIT(m), false);
+
+ old_state = m->state;
+ m->state = state;
+
+ if (!MOUNT_STATE_WITH_PROCESS(state)) {
+ m->timer_event_source = sd_event_source_unref(m->timer_event_source);
+ mount_unwatch_control_pid(m);
+ m->control_command = NULL;
+ m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
+ }
+
+ if (state != old_state)
+ log_unit_debug(UNIT(m), "Changed %s -> %s", 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 ? 0 : UNIT_NOTIFY_RELOAD_FAILURE);
+}
+
+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)
+ return 0;
+
+ if (m->control_pid > 0 &&
+ pid_is_unwaited(m->control_pid) &&
+ MOUNT_STATE_WITH_PROCESS(new_state)) {
+
+ r = unit_watch_pid(UNIT(m), m->control_pid);
+ if (r < 0)
+ return r;
+
+ r = mount_arm_timer(m, usec_add(u->state_change_timestamp.monotonic, m->timeout_usec));
+ if (r < 0)
+ return r;
+ }
+
+ if (!IN_SET(new_state, MOUNT_DEAD, MOUNT_FAILED)) {
+ (void) unit_setup_dynamic_creds(u);
+ (void) unit_setup_exec_runtime(u);
+ }
+
+ mount_set_state(m, new_state);
+ return 0;
+}
+
+static void mount_dump(Unit *u, FILE *f, const char *prefix) {
+ char buf[FORMAT_TIMESPAN_MAX];
+ 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 /proc/self/mountinfo: %s\n"
+ "%sFrom fragment: %s\n"
+ "%sExtrinsic: %s\n"
+ "%sDirectoryMode: %04o\n"
+ "%sSloppyOptions: %s\n"
+ "%sLazyUnmount: %s\n"
+ "%sForceUnmount: %s\n"
+ "%sTimeoutSec: %s\n",
+ prefix, mount_state_to_string(m->state),
+ prefix, mount_result_to_string(m->result),
+ prefix, m->where,
+ prefix, p ? strna(p->what) : "n/a",
+ prefix, p ? strna(p->fstype) : "n/a",
+ prefix, p ? strna(p->options) : "n/a",
+ prefix, yes_no(m->from_proc_self_mountinfo),
+ prefix, yes_no(m->from_fragment),
+ prefix, yes_no(mount_is_extrinsic(m)),
+ prefix, m->directory_mode,
+ prefix, yes_no(m->sloppy_options),
+ prefix, yes_no(m->lazy_unmount),
+ prefix, yes_no(m->force_unmount),
+ prefix, format_timespan(buf, sizeof(buf), m->timeout_usec, USEC_PER_SEC));
+
+ if (m->control_pid > 0)
+ fprintf(f,
+ "%sControl PID: "PID_FMT"\n",
+ prefix, m->control_pid);
+
+ exec_context_dump(&m->exec_context, f, prefix);
+ kill_context_dump(&m->kill_context, f, prefix);
+ cgroup_context_dump(&m->cgroup_context, f, prefix);
+}
+
+static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
+
+ _cleanup_(exec_params_clear) ExecParameters exec_params = {
+ .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
+ .stdin_fd = -1,
+ .stdout_fd = -1,
+ .stderr_fd = -1,
+ .exec_fd = -1,
+ };
+ pid_t pid;
+ int r;
+
+ assert(m);
+ assert(c);
+ assert(_pid);
+
+ r = unit_prepare_exec(UNIT(m));
+ if (r < 0)
+ return r;
+
+ r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
+ if (r < 0)
+ return r;
+
+ r = unit_set_exec_params(UNIT(m), &exec_params);
+ if (r < 0)
+ return r;
+
+ r = exec_spawn(UNIT(m),
+ c,
+ &m->exec_context,
+ &exec_params,
+ m->exec_runtime,
+ &m->dynamic_creds,
+ &pid);
+ if (r < 0)
+ return r;
+
+ r = unit_watch_pid(UNIT(m), pid);
+ if (r < 0)
+ /* FIXME: we need to do something here */
+ return r;
+
+ *_pid = pid;
+
+ return 0;
+}
+
+static void mount_enter_dead(Mount *m, MountResult f) {
+ assert(m);
+
+ if (m->result == MOUNT_SUCCESS)
+ m->result = f;
+
+ unit_log_result(UNIT(m), m->result == MOUNT_SUCCESS, mount_result_to_string(m->result));
+ mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD);
+
+ m->exec_runtime = exec_runtime_unref(m->exec_runtime, true);
+
+ exec_context_destroy_runtime_directory(&m->exec_context, UNIT(m)->manager->prefix[EXEC_DIRECTORY_RUNTIME]);
+
+ unit_unref_uid_gid(UNIT(m), true);
+
+ dynamic_creds_destroy(&m->dynamic_creds);
+
+ /* Any dependencies based on /proc/self/mountinfo are now stale */
+ unit_remove_dependencies(UNIT(m), UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
+}
+
+static void mount_enter_mounted(Mount *m, MountResult f) {
+ assert(m);
+
+ if (m->result == MOUNT_SUCCESS)
+ m->result = f;
+
+ mount_set_state(m, MOUNT_MOUNTED);
+}
+
+static void mount_enter_dead_or_mounted(Mount *m, MountResult f) {
+ assert(m);
+
+ /* Enter DEAD or MOUNTED state, depending on what the kernel currently says about the mount point. We use this
+ * whenever we executed an operation, so that our internal state reflects what the kernel says again, after all
+ * ultimately we just mirror the kernel's internal state on this. */
+
+ if (m->from_proc_self_mountinfo)
+ mount_enter_mounted(m, f);
+ else
+ mount_enter_dead(m, f);
+}
+
+static int state_to_kill_operation(MountState state) {
+ switch (state) {
+
+ case MOUNT_REMOUNTING_SIGTERM:
+ case MOUNT_UNMOUNTING_SIGTERM:
+ return KILL_TERMINATE;
+
+ case MOUNT_REMOUNTING_SIGKILL:
+ case MOUNT_UNMOUNTING_SIGKILL:
+ return KILL_KILL;
+
+ default:
+ return _KILL_OPERATION_INVALID;
+ }
+}
+
+static void mount_enter_signal(Mount *m, MountState state, MountResult f) {
+ int r;
+
+ assert(m);
+
+ if (m->result == MOUNT_SUCCESS)
+ m->result = f;
+
+ r = unit_kill_context(
+ UNIT(m),
+ &m->kill_context,
+ state_to_kill_operation(state),
+ -1,
+ m->control_pid,
+ false);
+ if (r < 0)
+ goto fail;
+
+ if (r > 0) {
+ r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->timeout_usec));
+ if (r < 0)
+ goto fail;
+
+ mount_set_state(m, state);
+ } else if (state == MOUNT_REMOUNTING_SIGTERM && m->kill_context.send_sigkill)
+ mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
+ else if (IN_SET(state, MOUNT_REMOUNTING_SIGTERM, MOUNT_REMOUNTING_SIGKILL))
+ mount_enter_mounted(m, MOUNT_SUCCESS);
+ else if (state == MOUNT_UNMOUNTING_SIGTERM && m->kill_context.send_sigkill)
+ mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS);
+ else
+ mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
+
+ return;
+
+fail:
+ log_unit_warning_errno(UNIT(m), r, "Failed to kill processes: %m");
+ mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
+}
+
+static void mount_enter_unmounting(Mount *m) {
+ int r;
+
+ assert(m);
+
+ /* Start counting our attempts */
+ if (!IN_SET(m->state,
+ MOUNT_UNMOUNTING,
+ MOUNT_UNMOUNTING_SIGTERM,
+ MOUNT_UNMOUNTING_SIGKILL))
+ m->n_retry_umount = 0;
+
+ m->control_command_id = MOUNT_EXEC_UNMOUNT;
+ m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
+
+ r = exec_command_set(m->control_command, UMOUNT_PATH, m->where, "-c", NULL);
+ if (r >= 0 && m->lazy_unmount)
+ r = exec_command_append(m->control_command, "-l", NULL);
+ if (r >= 0 && m->force_unmount)
+ r = exec_command_append(m->control_command, "-f", NULL);
+ if (r < 0)
+ goto fail;
+
+ mount_unwatch_control_pid(m);
+
+ r = mount_spawn(m, m->control_command, &m->control_pid);
+ if (r < 0)
+ goto fail;
+
+ mount_set_state(m, MOUNT_UNMOUNTING);
+
+ return;
+
+fail:
+ log_unit_warning_errno(UNIT(m), r, "Failed to run 'umount' task: %m");
+ mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
+}
+
+static void mount_enter_mounting(Mount *m) {
+ int r;
+ MountParameters *p;
+
+ assert(m);
+
+ r = unit_fail_if_noncanonical(UNIT(m), m->where);
+ if (r < 0)
+ goto fail;
+
+ (void) mkdir_p_label(m->where, m->directory_mode);
+
+ unit_warn_if_dir_nonempty(UNIT(m), m->where);
+ unit_warn_leftover_processes(UNIT(m));
+
+ m->control_command_id = MOUNT_EXEC_MOUNT;
+ m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
+
+ /* Create the source directory for bind-mounts if needed */
+ p = get_mount_parameters_fragment(m);
+ if (p && mount_is_bind(p))
+ (void) mkdir_p_label(p->what, m->directory_mode);
+
+ if (p) {
+ _cleanup_free_ char *opts = NULL;
+
+ r = fstab_filter_options(p->options, "nofail\0" "noauto\0" "auto\0", NULL, NULL, &opts);
+ if (r < 0)
+ goto fail;
+
+ r = exec_command_set(m->control_command, MOUNT_PATH, p->what, m->where, NULL);
+ if (r >= 0 && m->sloppy_options)
+ r = exec_command_append(m->control_command, "-s", NULL);
+ if (r >= 0 && p->fstype)
+ r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
+ if (r >= 0 && !isempty(opts))
+ r = exec_command_append(m->control_command, "-o", opts, NULL);
+ } else
+ r = -ENOENT;
+ if (r < 0)
+ goto fail;
+
+ mount_unwatch_control_pid(m);
+
+ r = mount_spawn(m, m->control_command, &m->control_pid);
+ if (r < 0)
+ goto fail;
+
+ mount_set_state(m, MOUNT_MOUNTING);
+
+ return;
+
+fail:
+ log_unit_warning_errno(UNIT(m), r, "Failed to run 'mount' task: %m");
+ mount_enter_dead_or_mounted(m, MOUNT_FAILURE_RESOURCES);
+}
+
+static void mount_set_reload_result(Mount *m, MountResult result) {
+ assert(m);
+
+ /* Only store the first error we encounter */
+ if (m->reload_result != MOUNT_SUCCESS)
+ return;
+
+ m->reload_result = result;
+}
+
+static void mount_enter_remounting(Mount *m) {
+ int r;
+ MountParameters *p;
+
+ assert(m);
+
+ /* Reset reload result when we are about to start a new remount operation */
+ m->reload_result = MOUNT_SUCCESS;
+
+ m->control_command_id = MOUNT_EXEC_REMOUNT;
+ m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
+
+ p = get_mount_parameters_fragment(m);
+ if (p) {
+ const char *o;
+
+ if (p->options)
+ o = strjoina("remount,", p->options);
+ else
+ o = "remount";
+
+ r = exec_command_set(m->control_command, MOUNT_PATH,
+ p->what, m->where,
+ "-o", o, NULL);
+ if (r >= 0 && m->sloppy_options)
+ r = exec_command_append(m->control_command, "-s", NULL);
+ if (r >= 0 && p->fstype)
+ r = exec_command_append(m->control_command, "-t", p->fstype, NULL);
+ } else
+ r = -ENOENT;
+ if (r < 0)
+ goto fail;
+
+ mount_unwatch_control_pid(m);
+
+ r = mount_spawn(m, m->control_command, &m->control_pid);
+ if (r < 0)
+ goto fail;
+
+ mount_set_state(m, MOUNT_REMOUNTING);
+
+ return;
+
+fail:
+ log_unit_warning_errno(UNIT(m), r, "Failed to run 'remount' task: %m");
+ mount_set_reload_result(m, MOUNT_FAILURE_RESOURCES);
+ mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
+}
+
+static void mount_cycle_clear(Mount *m) {
+ assert(m);
+
+ /* Clear all state we shall forget for this new cycle */
+
+ m->result = MOUNT_SUCCESS;
+ m->reload_result = MOUNT_SUCCESS;
+ exec_command_reset_status_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
+ UNIT(m)->reset_accounting = true;
+}
+
+static int mount_start(Unit *u) {
+ Mount *m = MOUNT(u);
+ int r;
+
+ assert(m);
+
+ /* We cannot fulfill this request right now, try again later
+ * please! */
+ if (IN_SET(m->state,
+ MOUNT_UNMOUNTING,
+ MOUNT_UNMOUNTING_SIGTERM,
+ MOUNT_UNMOUNTING_SIGKILL))
+ return -EAGAIN;
+
+ /* Already on it! */
+ if (m->state == MOUNT_MOUNTING)
+ return 0;
+
+ assert(IN_SET(m->state, MOUNT_DEAD, MOUNT_FAILED));
+
+ r = unit_start_limit_test(u);
+ if (r < 0) {
+ mount_enter_dead(m, MOUNT_FAILURE_START_LIMIT_HIT);
+ return r;
+ }
+
+ r = unit_acquire_invocation_id(u);
+ if (r < 0)
+ return r;
+
+ mount_cycle_clear(m);
+ mount_enter_mounting(m);
+
+ return 1;
+}
+
+static int mount_stop(Unit *u) {
+ Mount *m = MOUNT(u);
+
+ assert(m);
+
+ switch (m->state) {
+
+ case MOUNT_UNMOUNTING:
+ case MOUNT_UNMOUNTING_SIGKILL:
+ case MOUNT_UNMOUNTING_SIGTERM:
+ /* Already on it */
+ return 0;
+
+ case MOUNT_MOUNTING:
+ case MOUNT_MOUNTING_DONE:
+ case MOUNT_REMOUNTING:
+ /* If we are still waiting for /bin/mount, we go directly into kill mode. */
+ mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_SUCCESS);
+ return 0;
+
+ case MOUNT_REMOUNTING_SIGTERM:
+ /* If we are already waiting for a hung remount, convert this to the matching unmounting state */
+ mount_set_state(m, MOUNT_UNMOUNTING_SIGTERM);
+ return 0;
+
+ case MOUNT_REMOUNTING_SIGKILL:
+ /* as above */
+ mount_set_state(m, MOUNT_UNMOUNTING_SIGKILL);
+ return 0;
+
+ case MOUNT_MOUNTED:
+ mount_enter_unmounting(m);
+ return 1;
+
+ default:
+ assert_not_reached("Unexpected state.");
+ }
+}
+
+static int mount_reload(Unit *u) {
+ Mount *m = MOUNT(u);
+
+ assert(m);
+ assert(m->state == MOUNT_MOUNTED);
+
+ mount_enter_remounting(m);
+
+ return 1;
+}
+
+static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
+ Mount *m = MOUNT(u);
+
+ assert(m);
+ assert(f);
+ assert(fds);
+
+ (void) serialize_item(f, "state", mount_state_to_string(m->state));
+ (void) serialize_item(f, "result", mount_result_to_string(m->result));
+ (void) serialize_item(f, "reload-result", mount_result_to_string(m->reload_result));
+ (void) serialize_item_format(f, "n-retry-umount", "%u", m->n_retry_umount);
+
+ if (m->control_pid > 0)
+ (void) serialize_item_format(f, "control-pid", PID_FMT, m->control_pid);
+
+ if (m->control_command_id >= 0)
+ (void) serialize_item(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_unit_debug(u, "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_unit_debug(u, "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_unit_debug(u, "Failed to parse reload result value: %s", value);
+ else if (f != MOUNT_SUCCESS)
+ m->reload_result = f;
+
+ } else if (streq(key, "n-retry-umount")) {
+
+ r = safe_atou(value, &m->n_retry_umount);
+ if (r < 0)
+ log_unit_debug(u, "Failed to parse n-retry-umount value: %s", value);
+
+ } else if (streq(key, "control-pid")) {
+
+ if (parse_pid(value, &m->control_pid) < 0)
+ log_unit_debug(u, "Failed to parse control-pid value: %s", value);
+
+ } else if (streq(key, "control-command")) {
+ MountExecCommand id;
+
+ id = mount_exec_command_from_string(value);
+ if (id < 0)
+ log_unit_debug(u, "Failed to parse exec-command value: %s", value);
+ else {
+ m->control_command_id = id;
+ m->control_command = m->exec_command + id;
+ }
+ } else
+ log_unit_debug(u, "Unknown serialization key: %s", key);
+
+ return 0;
+}
+
+_pure_ static UnitActiveState mount_active_state(Unit *u) {
+ assert(u);
+
+ return state_translation_table[MOUNT(u)->state];
+}
+
+_pure_ static const char *mount_sub_state_to_string(Unit *u) {
+ assert(u);
+
+ return mount_state_to_string(MOUNT(u)->state);
+}
+
+_pure_ static bool mount_may_gc(Unit *u) {
+ Mount *m = MOUNT(u);
+
+ assert(m);
+
+ if (m->from_proc_self_mountinfo)
+ return false;
+
+ return true;
+}
+
+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, EXIT_CLEAN_COMMAND, NULL))
+ 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 (IN_SET(m->state, MOUNT_REMOUNTING, MOUNT_REMOUNTING_SIGKILL, MOUNT_REMOUNTING_SIGTERM))
+ mount_set_reload_result(m, f);
+ else if (m->result == 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;
+ }
+
+ unit_log_process_exit(
+ u, f == MOUNT_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
+ "Mount process",
+ mount_exec_command_to_string(m->control_command_id),
+ code, status);
+
+ /* Note that due to the io event priority logic, we can be sure the new mountinfo is loaded
+ * before we process the SIGCHLD for the mount command. */
+
+ switch (m->state) {
+
+ case MOUNT_MOUNTING:
+ /* Our mount point has not appeared in mountinfo. Something went wrong. */
+
+ if (f == MOUNT_SUCCESS) {
+ /* Either /bin/mount has an unexpected definition of success,
+ * or someone raced us and we lost. */
+ log_unit_warning(UNIT(m), "Mount process finished, but there is no mount.");
+ f = MOUNT_FAILURE_PROTOCOL;
+ }
+ mount_enter_dead(m, f);
+ break;
+
+ case MOUNT_MOUNTING_DONE:
+ mount_enter_mounted(m, f);
+ break;
+
+ case MOUNT_REMOUNTING:
+ case MOUNT_REMOUNTING_SIGTERM:
+ case MOUNT_REMOUNTING_SIGKILL:
+ mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
+ break;
+
+ case MOUNT_UNMOUNTING:
+
+ if (f == MOUNT_SUCCESS && m->from_proc_self_mountinfo) {
+
+ /* Still a mount point? If so, let's try again. Most likely there were multiple mount points
+ * stacked on top of each other. We might exceed the timeout specified by the user overall,
+ * but we will stop as soon as any one umount times out. */
+
+ if (m->n_retry_umount < RETRY_UMOUNT_MAX) {
+ log_unit_debug(u, "Mount still present, trying again.");
+ m->n_retry_umount++;
+ mount_enter_unmounting(m);
+ } else {
+ log_unit_warning(u, "Mount still present after %u attempts to unmount, giving up.", m->n_retry_umount);
+ mount_enter_mounted(m, f);
+ }
+ } else
+ mount_enter_dead_or_mounted(m, f);
+
+ break;
+
+ case MOUNT_UNMOUNTING_SIGKILL:
+ case MOUNT_UNMOUNTING_SIGTERM:
+ mount_enter_dead_or_mounted(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 int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
+ Mount *m = MOUNT(userdata);
+
+ assert(m);
+ assert(m->timer_event_source == source);
+
+ switch (m->state) {
+
+ case MOUNT_MOUNTING:
+ case MOUNT_MOUNTING_DONE:
+ log_unit_warning(UNIT(m), "Mounting timed out. Terminating.");
+ mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
+ break;
+
+ case MOUNT_REMOUNTING:
+ log_unit_warning(UNIT(m), "Remounting timed out. Terminating remount process.");
+ mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
+ mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, MOUNT_SUCCESS);
+ break;
+
+ case MOUNT_REMOUNTING_SIGTERM:
+ mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
+
+ if (m->kill_context.send_sigkill) {
+ log_unit_warning(UNIT(m), "Remounting timed out. Killing.");
+ mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
+ } else {
+ log_unit_warning(UNIT(m), "Remounting timed out. Skipping SIGKILL. Ignoring.");
+ mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
+ }
+ break;
+
+ case MOUNT_REMOUNTING_SIGKILL:
+ mount_set_reload_result(m, MOUNT_FAILURE_TIMEOUT);
+
+ log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
+ mount_enter_dead_or_mounted(m, MOUNT_SUCCESS);
+ break;
+
+ case MOUNT_UNMOUNTING:
+ log_unit_warning(UNIT(m), "Unmounting timed out. Terminating.");
+ mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
+ break;
+
+ case MOUNT_UNMOUNTING_SIGTERM:
+ if (m->kill_context.send_sigkill) {
+ log_unit_warning(UNIT(m), "Mount process timed out. Killing.");
+ mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
+ } else {
+ log_unit_warning(UNIT(m), "Mount process timed out. Skipping SIGKILL. Ignoring.");
+ mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
+ }
+ break;
+
+ case MOUNT_UNMOUNTING_SIGKILL:
+ log_unit_warning(UNIT(m), "Mount process still around after SIGKILL. Ignoring.");
+ mount_enter_dead_or_mounted(m, MOUNT_FAILURE_TIMEOUT);
+ break;
+
+ default:
+ assert_not_reached("Timeout at wrong time.");
+ }
+
+ return 0;
+}
+
+static int mount_setup_new_unit(
+ Manager *m,
+ const char *name,
+ const char *what,
+ const char *where,
+ const char *options,
+ const char *fstype,
+ MountProcFlags *ret_flags,
+ Unit **ret) {
+
+ _cleanup_(unit_freep) Unit *u = NULL;
+ int r;
+
+ assert(m);
+ assert(name);
+ assert(ret_flags);
+ assert(ret);
+
+ r = unit_new_for_name(m, sizeof(Mount), name, &u);
+ if (r < 0)
+ return r;
+
+ r = free_and_strdup(&u->source_path, "/proc/self/mountinfo");
+ if (r < 0)
+ return r;
+
+ r = free_and_strdup(&MOUNT(u)->where, where);
+ if (r < 0)
+ return r;
+
+ r = update_parameters_proc_self_mount_info(MOUNT(u), what, options, fstype);
+ if (r < 0)
+ return r;
+
+ /* This unit was generated because /proc/self/mountinfo reported it. Remember this, so that by the time we load
+ * the unit file for it (and thus add in extra deps right after) we know what source to attributes the deps
+ * to.*/
+ MOUNT(u)->from_proc_self_mountinfo = true;
+
+ /* We have only allocated the stub now, let's enqueue this unit for loading now, so that everything else is
+ * loaded in now. */
+ unit_add_to_load_queue(u);
+
+ *ret_flags = MOUNT_PROC_IS_MOUNTED | MOUNT_PROC_JUST_MOUNTED | MOUNT_PROC_JUST_CHANGED;
+ *ret = TAKE_PTR(u);
+ return 0;
+}
+
+static int mount_setup_existing_unit(
+ Unit *u,
+ const char *what,
+ const char *where,
+ const char *options,
+ const char *fstype,
+ MountProcFlags *ret_flags) {
+
+ MountProcFlags flags = MOUNT_PROC_IS_MOUNTED;
+ int r;
+
+ assert(u);
+ assert(flags);
+
+ if (!MOUNT(u)->where) {
+ MOUNT(u)->where = strdup(where);
+ if (!MOUNT(u)->where)
+ return -ENOMEM;
+ }
+
+ r = update_parameters_proc_self_mount_info(MOUNT(u), what, options, fstype);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ flags |= MOUNT_PROC_JUST_CHANGED;
+
+ if (!MOUNT(u)->from_proc_self_mountinfo || FLAGS_SET(MOUNT(u)->proc_flags, MOUNT_PROC_JUST_MOUNTED))
+ flags |= MOUNT_PROC_JUST_MOUNTED;
+
+ MOUNT(u)->from_proc_self_mountinfo = true;
+
+ if (IN_SET(u->load_state, UNIT_NOT_FOUND, UNIT_BAD_SETTING, UNIT_ERROR)) {
+ /* The unit was previously not found or otherwise not loaded. Now that the unit shows up in
+ * /proc/self/mountinfo we should reconsider it this, hence set it to UNIT_LOADED. */
+ u->load_state = UNIT_LOADED;
+ u->load_error = 0;
+
+ flags |= MOUNT_PROC_JUST_CHANGED;
+ }
+
+ if (FLAGS_SET(flags, MOUNT_PROC_JUST_CHANGED)) {
+ /* If things changed, then make sure that all deps are regenerated. Let's
+ * first remove all automatic deps, and then add in the new ones. */
+
+ unit_remove_dependencies(u, UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
+
+ r = mount_add_extras(MOUNT(u));
+ if (r < 0)
+ return r;
+ }
+
+ *ret_flags = flags;
+ return 0;
+}
+
+static int mount_setup_unit(
+ Manager *m,
+ const char *what,
+ const char *where,
+ const char *options,
+ const char *fstype,
+ bool set_flags) {
+
+ _cleanup_free_ char *e = NULL;
+ MountProcFlags flags;
+ Unit *u;
+ int r;
+
+ assert(m);
+ assert(what);
+ assert(where);
+ assert(options);
+ assert(fstype);
+
+ /* 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;
+
+ r = unit_name_from_path(where, ".mount", &e);
+ if (r < 0)
+ return log_error_errno(r, "Failed to generate unit name from path '%s': %m", where);
+
+ u = manager_get_unit(m, e);
+ if (u)
+ r = mount_setup_existing_unit(u, what, where, options, fstype, &flags);
+ else
+ /* First time we see this mount point meaning that it's not been initiated by a mount unit but rather
+ * by the sysadmin having called mount(8) directly. */
+ r = mount_setup_new_unit(m, e, what, where, options, fstype, &flags, &u);
+ if (r < 0)
+ return log_warning_errno(r, "Failed to set up mount unit: %m");
+
+ /* If the mount changed properties or state, let's notify our clients */
+ if (flags & (MOUNT_PROC_JUST_CHANGED|MOUNT_PROC_JUST_MOUNTED))
+ unit_add_to_dbus_queue(u);
+
+ if (set_flags)
+ MOUNT(u)->proc_flags = flags;
+
+ return 0;
+}
+
+static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
+ _cleanup_(mnt_free_tablep) struct libmnt_table *t = NULL;
+ _cleanup_(mnt_free_iterp) struct libmnt_iter *i = NULL;
+ int r;
+
+ assert(m);
+
+ t = mnt_new_table();
+ i = mnt_new_iter(MNT_ITER_FORWARD);
+ if (!t || !i)
+ return log_oom();
+
+ r = mnt_table_parse_mtab(t, NULL);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse /proc/self/mountinfo: %m");
+
+ for (;;) {
+ struct libmnt_fs *fs;
+ const char *device, *path, *options, *fstype;
+ _cleanup_free_ char *d = NULL, *p = NULL;
+ int k;
+
+ k = mnt_table_next_fs(t, i, &fs);
+ if (k == 1)
+ break;
+ if (k < 0)
+ return log_error_errno(k, "Failed to get next entry from /proc/self/mountinfo: %m");
+
+ device = mnt_fs_get_source(fs);
+ path = mnt_fs_get_target(fs);
+ options = mnt_fs_get_options(fs);
+ fstype = mnt_fs_get_fstype(fs);
+
+ if (!device || !path)
+ continue;
+
+ if (cunescape(device, UNESCAPE_RELAX, &d) < 0)
+ return log_oom();
+
+ if (cunescape(path, UNESCAPE_RELAX, &p) < 0)
+ return log_oom();
+
+ device_found_node(m, d, DEVICE_FOUND_MOUNT, DEVICE_FOUND_MOUNT);
+
+ (void) mount_setup_unit(m, d, p, options, fstype, set_flags);
+ }
+
+ return 0;
+}
+
+static void mount_shutdown(Manager *m) {
+ assert(m);
+
+ m->mount_event_source = sd_event_source_unref(m->mount_event_source);
+
+ mnt_unref_monitor(m->mount_monitor);
+ m->mount_monitor = NULL;
+}
+
+static int mount_get_timeout(Unit *u, usec_t *timeout) {
+ Mount *m = MOUNT(u);
+ usec_t t;
+ int r;
+
+ if (!m->timer_event_source)
+ return 0;
+
+ r = sd_event_source_get_time(m->timer_event_source, &t);
+ if (r < 0)
+ return r;
+ if (t == USEC_INFINITY)
+ return 0;
+
+ *timeout = t;
+ return 1;
+}
+
+static void mount_enumerate_perpetual(Manager *m) {
+ Unit *u;
+ int r;
+
+ assert(m);
+
+ /* Whatever happens, we know for sure that the root directory is around, and cannot go away. Let's
+ * unconditionally synthesize it here and mark it as perpetual. */
+
+ u = manager_get_unit(m, SPECIAL_ROOT_MOUNT);
+ if (!u) {
+ r = unit_new_for_name(m, sizeof(Mount), SPECIAL_ROOT_MOUNT, &u);
+ if (r < 0) {
+ log_error_errno(r, "Failed to allocate the special " SPECIAL_ROOT_MOUNT " unit: %m");
+ return;
+ }
+ }
+
+ u->perpetual = true;
+ MOUNT(u)->deserialized_state = MOUNT_MOUNTED;
+
+ unit_add_to_load_queue(u);
+ unit_add_to_dbus_queue(u);
+}
+
+static bool mount_is_mounted(Mount *m) {
+ assert(m);
+
+ return UNIT(m)->perpetual || FLAGS_SET(m->proc_flags, MOUNT_PROC_IS_MOUNTED);
+}
+
+static void mount_enumerate(Manager *m) {
+ int r;
+
+ assert(m);
+
+ mnt_init_debug(0);
+
+ if (!m->mount_monitor) {
+ int fd;
+
+ m->mount_monitor = mnt_new_monitor();
+ if (!m->mount_monitor) {
+ log_oom();
+ goto fail;
+ }
+
+ r = mnt_monitor_enable_kernel(m->mount_monitor, 1);
+ if (r < 0) {
+ log_error_errno(r, "Failed to enable watching of kernel mount events: %m");
+ goto fail;
+ }
+
+ r = mnt_monitor_enable_userspace(m->mount_monitor, 1, NULL);
+ if (r < 0) {
+ log_error_errno(r, "Failed to enable watching of userspace mount events: %m");
+ goto fail;
+ }
+
+ /* mnt_unref_monitor() will close the fd */
+ fd = r = mnt_monitor_get_fd(m->mount_monitor);
+ if (r < 0) {
+ log_error_errno(r, "Failed to acquire watch file descriptor: %m");
+ goto fail;
+ }
+
+ r = sd_event_add_io(m->event, &m->mount_event_source, fd, EPOLLIN, mount_dispatch_io, m);
+ if (r < 0) {
+ log_error_errno(r, "Failed to watch mount file descriptor: %m");
+ goto fail;
+ }
+
+ r = sd_event_source_set_priority(m->mount_event_source, SD_EVENT_PRIORITY_NORMAL-10);
+ if (r < 0) {
+ log_error_errno(r, "Failed to adjust mount watch priority: %m");
+ goto fail;
+ }
+
+ (void) sd_event_source_set_description(m->mount_event_source, "mount-monitor-dispatch");
+ }
+
+ r = mount_load_proc_self_mountinfo(m, false);
+ if (r < 0)
+ goto fail;
+
+ return;
+
+fail:
+ mount_shutdown(m);
+}
+
+static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
+ _cleanup_set_free_free_ Set *around = NULL, *gone = NULL;
+ Manager *m = userdata;
+ const char *what;
+ Iterator i;
+ Unit *u;
+ int r;
+
+ assert(m);
+ assert(revents & EPOLLIN);
+
+ if (fd == mnt_monitor_get_fd(m->mount_monitor)) {
+ bool rescan = false;
+
+ /* Drain all events and verify that the event is valid.
+ *
+ * Note that libmount also monitors /run/mount mkdir if the
+ * directory does not exist yet. The mkdir may generate event
+ * which is irrelevant for us.
+ *
+ * error: r < 0; valid: r == 0, false positive: rc == 1 */
+ do {
+ r = mnt_monitor_next_change(m->mount_monitor, NULL, NULL);
+ if (r == 0)
+ rescan = true;
+ else if (r < 0)
+ return log_error_errno(r, "Failed to drain libmount events: %m");
+ } while (r == 0);
+
+ log_debug("libmount event [rescan: %s]", yes_no(rescan));
+ if (!rescan)
+ return 0;
+ }
+
+ r = mount_load_proc_self_mountinfo(m, true);
+ if (r < 0) {
+ /* Reset flags, just in case, for later calls */
+ LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT])
+ MOUNT(u)->proc_flags = 0;
+
+ return 0;
+ }
+
+ 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(mount)) {
+
+ /* A mount point is not around right now. It
+ * might be gone, or might never have
+ * existed. */
+
+ if (mount->from_proc_self_mountinfo &&
+ mount->parameters_proc_self_mountinfo.what) {
+
+ /* Remember that this device might just have disappeared */
+ if (set_ensure_allocated(&gone, &path_hash_ops) < 0 ||
+ set_put_strdup(gone, mount->parameters_proc_self_mountinfo.what) < 0)
+ log_oom(); /* we don't care too much about OOM here... */
+ }
+
+ mount->from_proc_self_mountinfo = false;
+ assert_se(update_parameters_proc_self_mount_info(mount, NULL, NULL, NULL) >= 0);
+
+ switch (mount->state) {
+
+ case MOUNT_MOUNTED:
+ /* This has just been unmounted by somebody else, follow the state change. */
+ mount_enter_dead(mount, MOUNT_SUCCESS);
+ break;
+
+ default:
+ break;
+ }
+
+ } else if (mount->proc_flags & (MOUNT_PROC_JUST_MOUNTED|MOUNT_PROC_JUST_CHANGED)) {
+
+ /* A mount point was added or changed */
+
+ switch (mount->state) {
+
+ case MOUNT_DEAD:
+ case MOUNT_FAILED:
+
+ /* This has just been mounted by somebody else, follow the state change, but let's
+ * generate a new invocation ID for this implicitly and automatically. */
+ (void) unit_acquire_invocation_id(u);
+ mount_cycle_clear(mount);
+ mount_enter_mounted(mount, MOUNT_SUCCESS);
+ break;
+
+ case MOUNT_MOUNTING:
+ mount_set_state(mount, MOUNT_MOUNTING_DONE);
+ 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;
+ }
+ }
+
+ if (mount_is_mounted(mount) &&
+ mount->from_proc_self_mountinfo &&
+ mount->parameters_proc_self_mountinfo.what) {
+ /* Track devices currently used */
+
+ if (set_ensure_allocated(&around, &path_hash_ops) < 0 ||
+ set_put_strdup(around, mount->parameters_proc_self_mountinfo.what) < 0)
+ log_oom();
+ }
+
+ /* Reset the flags for later calls */
+ mount->proc_flags = 0;
+ }
+
+ SET_FOREACH(what, gone, i) {
+ if (set_contains(around, what))
+ continue;
+
+ /* Let the device units know that the device is no longer mounted */
+ device_found_node(m, what, 0, DEVICE_FOUND_MOUNT);
+ }
+
+ return 0;
+}
+
+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, int signo, sd_bus_error *error) {
+ Mount *m = MOUNT(u);
+
+ assert(m);
+
+ return unit_kill_common(u, who, signo, -1, MOUNT(u)->control_pid, error);
+}
+
+static int mount_control_pid(Unit *u) {
+ Mount *m = MOUNT(u);
+
+ assert(m);
+
+ return m->control_pid;
+}
+
+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",
+ [MOUNT_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
+ [MOUNT_FAILURE_PROTOCOL] = "protocol",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(mount_result, MountResult);
+
+const UnitVTable mount_vtable = {
+ .object_size = sizeof(Mount),
+ .exec_context_offset = offsetof(Mount, exec_context),
+ .cgroup_context_offset = offsetof(Mount, cgroup_context),
+ .kill_context_offset = offsetof(Mount, kill_context),
+ .exec_runtime_offset = offsetof(Mount, exec_runtime),
+ .dynamic_creds_offset = offsetof(Mount, dynamic_creds),
+
+ .sections =
+ "Unit\0"
+ "Mount\0"
+ "Install\0",
+ .private_section = "Mount",
+
+ .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,
+
+ .may_gc = mount_may_gc,
+
+ .sigchld_event = mount_sigchld_event,
+
+ .reset_failed = mount_reset_failed,
+
+ .control_pid = mount_control_pid,
+
+ .bus_vtable = bus_mount_vtable,
+ .bus_set_property = bus_mount_set_property,
+ .bus_commit_properties = bus_mount_commit_properties,
+
+ .get_timeout = mount_get_timeout,
+
+ .can_transient = true,
+
+ .enumerate_perpetual = mount_enumerate_perpetual,
+ .enumerate = mount_enumerate,
+ .shutdown = mount_shutdown,
+
+ .status_message_formats = {
+ .starting_stopping = {
+ [0] = "Mounting %s...",
+ [1] = "Unmounting %s...",
+ },
+ .finished_start_job = {
+ [JOB_DONE] = "Mounted %s.",
+ [JOB_FAILED] = "Failed to mount %s.",
+ [JOB_TIMEOUT] = "Timed out mounting %s.",
+ },
+ .finished_stop_job = {
+ [JOB_DONE] = "Unmounted %s.",
+ [JOB_FAILED] = "Failed unmounting %s.",
+ [JOB_TIMEOUT] = "Timed out unmounting %s.",
+ },
+ },
+};