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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:35:18 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:35:18 +0000
commitb750101eb236130cf056c675997decbac904cc49 (patch)
treea5df1a06754bdd014cb975c051c83b01c9a97532 /src/core/mount.c
parentInitial commit. (diff)
downloadsystemd-b750101eb236130cf056c675997decbac904cc49.tar.xz
systemd-b750101eb236130cf056c675997decbac904cc49.zip
Adding upstream version 252.22.upstream/252.22
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/core/mount.c')
-rw-r--r--src/core/mount.c2344
1 files changed, 2344 insertions, 0 deletions
diff --git a/src/core/mount.c b/src/core/mount.c
new file mode 100644
index 0000000..82ff3a7
--- /dev/null
+++ b/src/core/mount.c
@@ -0,0 +1,2344 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <signal.h>
+#include <stdio.h>
+#include <sys/epoll.h>
+
+#include "sd-messages.h"
+
+#include "alloc-util.h"
+#include "dbus-mount.h"
+#include "dbus-unit.h"
+#include "device.h"
+#include "exit-status.h"
+#include "format-util.h"
+#include "fs-util.h"
+#include "fstab-util.h"
+#include "libmount-util.h"
+#include "log.h"
+#include "manager.h"
+#include "mkdir-label.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 "stat-util.h"
+#include "string-table.h"
+#include "string-util.h"
+#include "strv.h"
+#include "unit-name.h"
+#include "unit.h"
+
+#define RETRY_UMOUNT_MAX 32
+
+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,
+ [MOUNT_CLEANING] = UNIT_MAINTENANCE,
+};
+
+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 void mount_enter_dead(Mount *m, MountResult f);
+static void mount_enter_mounted(Mount *m, MountResult f);
+static void mount_cycle_clear(Mount *m);
+static int mount_process_proc_self_mountinfo(Manager *m);
+
+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,
+ MOUNT_CLEANING);
+}
+
+static MountParameters* get_mount_parameters_fragment(Mount *m) {
+ assert(m);
+
+ if (m->from_fragment)
+ return &m->parameters_fragment;
+
+ 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_fragment(m);
+}
+
+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_nofail(const Mount *m) {
+ assert(m);
+
+ if (!m->from_fragment)
+ return false;
+
+ return fstab_test_yes_no_option(m->parameters_fragment.options, "nofail\0" "fail\0");
+}
+
+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_bound_to_device(Mount *m) {
+ const MountParameters *p;
+
+ assert(m);
+
+ /* Determines whether to place a Requires= or BindsTo= dependency on the backing device unit. We do
+ * this by checking for the x-systemd.device-bound mount option. Iff it is set we use BindsTo=,
+ * otherwise Requires=. But note that we might combine the latter with StopPropagatedFrom=, see
+ * below. */
+
+ p = get_mount_parameters(m);
+ if (!p)
+ return false;
+
+ return fstab_test_option(p->options, "x-systemd.device-bound\0");
+}
+
+static bool mount_propagate_stop(Mount *m) {
+ assert(m);
+
+ if (mount_is_bound_to_device(m)) /* If we are using BindsTo= the stop propagation is implicit, no need to bother */
+ return false;
+
+ return m->from_fragment; /* let's propagate stop whenever this is an explicitly configured unit,
+ * otherwise let's not bother. */
+}
+
+static bool mount_needs_quota(const MountParameters *p) {
+ assert(p);
+
+ if (p->fstype && !fstype_needs_quota(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(m);
+ 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 (usec == USEC_INFINITY)
+ return sd_event_source_set_enabled(m->timer_event_source, SD_EVENT_OFF);
+
+ 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);
+ }
+
+ 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), TAKE_PID(m->control_pid));
+}
+
+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_disable_unref(m->timer_event_source);
+}
+
+static int update_parameters_proc_self_mountinfo(
+ 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;
+ 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 */
+
+ r = path_extract_directory(m->where, &parent);
+ if (r < 0)
+ return r;
+
+ 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) {
+
+ 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) {
+ UnitDependencyMask mask;
+ MountParameters *p;
+ UnitDependency dep;
+ int r;
+
+ assert(m);
+
+ log_unit_trace(UNIT(m), "Processing implicit device dependencies");
+
+ p = get_mount_parameters(m);
+ if (!p) {
+ log_unit_trace(UNIT(m), "Missing mount parameters, skipping implicit device dependencies");
+ return 0;
+ }
+
+ if (!p->what) {
+ log_unit_trace(UNIT(m), "Missing mount source, skipping implicit device dependencies");
+ return 0;
+ }
+
+ if (mount_is_bind(p)) {
+ log_unit_trace(UNIT(m), "Mount unit is a bind mount, skipping implicit device dependencies");
+ return 0;
+ }
+
+ if (!is_device_path(p->what)) {
+ log_unit_trace(UNIT(m), "Mount source is not a device path, skipping implicit device dependencies");
+ 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_IN_SET(p->what, "/dev/root", "/dev/nfs")) {
+ log_unit_trace(UNIT(m), "Mount source is in /dev/root or /dev/nfs, skipping implicit device dependencies");
+ return 0;
+ }
+
+ if (path_equal(m->where, "/")) {
+ log_unit_trace(UNIT(m), "Mount destination is '/', skipping implicit device dependencies");
+ return 0;
+ }
+
+ /* Mount units from /proc/self/mountinfo are not bound to devices by default since they're subject to
+ * races when mounts are established by other tools with different backing devices than what we
+ * maintain. The user can still force this to be a BindsTo= dependency 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 : UNIT_DEPENDENCY_MOUNT_FILE;
+
+ r = unit_add_node_dependency(UNIT(m), p->what, dep, mask);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ log_unit_trace(UNIT(m), "Added %s dependency on %s", unit_dependency_to_string(dep), p->what);
+
+ if (mount_propagate_stop(m)) {
+ r = unit_add_node_dependency(UNIT(m), p->what, UNIT_STOP_PROPAGATED_FROM, mask);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ log_unit_trace(UNIT(m), "Added %s dependency on %s",
+ unit_dependency_to_string(UNIT_STOP_PROPAGATED_FROM), p->what);
+ }
+
+ r = unit_add_blockdev_dependency(UNIT(m), p->what, mask);
+ if (r > 0)
+ log_unit_trace(UNIT(m), "Added %s dependency on %s", unit_dependency_to_string(UNIT_AFTER), p->what);
+
+ return 0;
+}
+
+static int mount_add_quota_dependencies(Mount *m) {
+ 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;
+
+ r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE,
+ /* add_reference= */ true, UNIT_DEPENDENCY_FILE);
+ if (r < 0)
+ return r;
+
+ r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE,
+ /* add_reference= */true, UNIT_DEPENDENCY_FILE);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+static bool mount_is_extrinsic(Unit *u) {
+ MountParameters *p;
+ Mount *m = MOUNT(u);
+ 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. */
+
+ /* We only automatically manage mounts if we are in system mode */
+ if (MANAGER_IS_USER(u->manager))
+ return true;
+
+ p = get_mount_parameters(m);
+ if (p && fstab_is_extrinsic(m->where, p->options))
+ return true;
+
+ return false;
+}
+
+static int mount_add_default_ordering_dependencies(Mount *m, MountParameters *p, UnitDependencyMask mask) {
+ const char *after, *before, *e;
+ int r;
+
+ assert(m);
+
+ e = path_startswith(m->where, "/sysroot");
+ if (e && in_initrd()) {
+ /* All mounts under /sysroot need to happen later, at initrd-fs.target time. IOW,
+ * it's not technically part of the basic initrd filesystem itself, and so
+ * shouldn't inherit the default Before=local-fs.target dependency. However,
+ * these mounts still need to start after local-fs-pre.target, as a sync point
+ * for things like systemd-hibernate-resume@.service that should start before
+ * any mounts. */
+
+ after = SPECIAL_LOCAL_FS_PRE_TARGET;
+ before = isempty(e) ? SPECIAL_INITRD_ROOT_FS_TARGET : SPECIAL_INITRD_FS_TARGET;
+
+ } else if (in_initrd() && path_startswith(m->where, "/sysusr/usr")) {
+ after = SPECIAL_LOCAL_FS_PRE_TARGET;
+ before = SPECIAL_INITRD_USR_FS_TARGET;
+
+ } else if (mount_is_network(p)) {
+ after = SPECIAL_REMOTE_FS_PRE_TARGET;
+ before = SPECIAL_REMOTE_FS_TARGET;
+
+ } else {
+ after = SPECIAL_LOCAL_FS_PRE_TARGET;
+ before = SPECIAL_LOCAL_FS_TARGET;
+ }
+
+ if (!mount_is_nofail(m)) {
+ r = unit_add_dependency_by_name(UNIT(m), UNIT_BEFORE, before, /* add_reference= */ true, mask);
+ if (r < 0)
+ return r;
+ }
+
+ r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, /* add_reference= */ true, mask);
+ if (r < 0)
+ return r;
+
+ return unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET,
+ /* add_reference= */ true, mask);
+}
+
+static int mount_add_default_dependencies(Mount *m) {
+ UnitDependencyMask mask;
+ MountParameters *p;
+ 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(UNIT(m)))
+ return 0;
+
+ p = get_mount_parameters(m);
+ if (!p)
+ return 0;
+
+ mask = m->from_proc_self_mountinfo ? UNIT_DEPENDENCY_MOUNTINFO : UNIT_DEPENDENCY_MOUNT_FILE;
+
+ r = mount_add_default_ordering_dependencies(m, p, mask);
+ if (r < 0)
+ return r;
+
+ 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,
+ /* add_reference= */ 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,
+ /* add_reference= */ 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,
+ /* add_reference= */ 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);
+ assert(UNIT(m)->load_state == UNIT_LOADED);
+
+ 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))
+ return log_unit_error_errno(UNIT(m), SYNTHETIC_ERRNO(ENOEXEC), "Where= setting doesn't match unit name. Refusing.");
+
+ if (mount_point_is_api(m->where) || mount_point_ignore(m->where))
+ return log_unit_error_errno(UNIT(m), SYNTHETIC_ERRNO(ENOEXEC), "Cannot create mount unit for API file system %s. Refusing.", m->where);
+
+ p = get_mount_parameters_fragment(m);
+ if (p && !p->what && !UNIT(m)->perpetual)
+ return log_unit_error_errno(UNIT(m), SYNTHETIC_ERRNO(ENOEXEC),
+ "What= setting is missing. Refusing.");
+
+ if (m->exec_context.pam_name && m->kill_context.kill_mode != KILL_CONTROL_GROUP)
+ return log_unit_error_errno(UNIT(m), SYNTHETIC_ERRNO(ENOEXEC), "Unit has PAM enabled. Kill mode must be set to control-group'. Refusing.");
+
+ return 0;
+}
+
+static int mount_add_non_exec_dependencies(Mount *m) {
+ int r;
+
+ assert(m);
+
+ /* We may be called due to this mount appearing in /proc/self/mountinfo, hence we clear all existing
+ * dependencies that were initialized from the unit file but whose final value really depends on the
+ * content of /proc/self/mountinfo. Some (such as m->where) might have become stale now. */
+ unit_remove_dependencies(UNIT(m), UNIT_DEPENDENCY_MOUNTINFO | UNIT_DEPENDENCY_MOUNT_FILE);
+
+ if (!m->where)
+ return 0;
+
+ /* Adds in all dependencies directly responsible for ordering the mount, as opposed to dependencies
+ * resulting from the ExecContext and such. */
+
+ 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 = mount_add_default_dependencies(m);
+ if (r < 0)
+ return r;
+
+ 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 == -ENAMETOOLONG)
+ log_unit_error_errno(u, r, "Failed to derive mount point path from unit name, because unit name is hashed. "
+ "Set \"Where=\" in the unit file explicitly.");
+ if (r < 0)
+ return r;
+ }
+
+ path_simplify(m->where);
+
+ if (!u->description) {
+ r = unit_set_description(u, m->where);
+ 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_non_exec_dependencies(m);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+static void mount_load_root_mount(Unit *u) {
+ assert(u);
+
+ if (!unit_has_name(u, SPECIAL_ROOT_MOUNT))
+ return;
+
+ 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");
+}
+
+static int mount_load(Unit *u) {
+ Mount *m = MOUNT(u);
+ int r, q = 0;
+
+ assert(m);
+ assert(u);
+ assert(u->load_state == UNIT_STUB);
+
+ mount_load_root_mount(u);
+
+ bool fragment_optional = m->from_proc_self_mountinfo || u->perpetual;
+ r = unit_load_fragment_and_dropin(u, !fragment_optional);
+
+ /* 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)
+ q = mount_add_extras(m);
+
+ if (r < 0)
+ return r;
+ if (q < 0)
+ return q;
+ if (u->load_state != UNIT_LOADED)
+ return 0;
+
+ 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_disable_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);
+ int r;
+
+ assert(m);
+ assert(m->state == MOUNT_DEAD);
+
+ if (m->deserialized_state == m->state)
+ return 0;
+
+ if (m->control_pid > 0 &&
+ pid_is_unwaited(m->control_pid) &&
+ MOUNT_STATE_WITH_PROCESS(m->deserialized_state)) {
+
+ r = unit_watch_pid(UNIT(m), m->control_pid, false);
+ 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(m->deserialized_state, MOUNT_DEAD, MOUNT_FAILED)) {
+ (void) unit_setup_dynamic_creds(u);
+ (void) unit_setup_exec_runtime(u);
+ }
+
+ mount_set_state(m, m->deserialized_state);
+ return 0;
+}
+
+static void mount_catchup(Unit *u) {
+ Mount *m = MOUNT(ASSERT_PTR(u));
+
+ assert(m);
+
+ /* Adjust the deserialized state. See comments in mount_process_proc_self_mountinfo(). */
+ if (m->from_proc_self_mountinfo)
+ switch (m->state) {
+ case MOUNT_DEAD:
+ case MOUNT_FAILED:
+ assert(m->control_pid == 0);
+ (void) unit_acquire_invocation_id(u);
+ mount_cycle_clear(m);
+ mount_enter_mounted(m, MOUNT_SUCCESS);
+ break;
+ case MOUNT_MOUNTING:
+ assert(m->control_pid > 0);
+ mount_set_state(m, MOUNT_MOUNTING_DONE);
+ break;
+ default:
+ break;
+ }
+ else
+ switch (m->state) {
+ case MOUNT_MOUNTING_DONE:
+ assert(m->control_pid > 0);
+ mount_set_state(m, MOUNT_MOUNTING);
+ break;
+ case MOUNT_MOUNTED:
+ assert(m->control_pid == 0);
+ mount_enter_dead(m, MOUNT_SUCCESS);
+ break;
+ default:
+ break;
+ }
+}
+
+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"
+ "%sClean Result: %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"
+ "%sReadWriteOnly: %s\n"
+ "%sTimeoutSec: %s\n",
+ prefix, mount_state_to_string(m->state),
+ prefix, mount_result_to_string(m->result),
+ prefix, mount_result_to_string(m->clean_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(u)),
+ prefix, m->directory_mode,
+ prefix, yes_no(m->sloppy_options),
+ prefix, yes_no(m->lazy_unmount),
+ prefix, yes_no(m->force_unmount),
+ prefix, yes_no(m->read_write_only),
+ prefix, FORMAT_TIMESPAN(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(UNIT(m), 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, true);
+ if (r < 0)
+ 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));
+ unit_warn_leftover_processes(UNIT(m), unit_log_leftover_process_stop);
+
+ mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD);
+
+ m->exec_runtime = exec_runtime_unref(m->exec_runtime, true);
+
+ unit_destroy_runtime_data(UNIT(m), &m->exec_context);
+
+ unit_unref_uid_gid(UNIT(m), true);
+
+ dynamic_creds_destroy(&m->dynamic_creds);
+
+ /* Any dependencies based on /proc/self/mountinfo are now stale. Let's re-generate dependencies from
+ * .mount unit. */
+ (void) mount_add_non_exec_dependencies(m);
+}
+
+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:
+ return KILL_RESTART;
+
+ 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;
+ bool source_is_dir = true;
+
+ assert(m);
+
+ r = unit_fail_if_noncanonical(UNIT(m), m->where);
+ if (r < 0)
+ goto fail;
+
+ p = get_mount_parameters_fragment(m);
+ if (p && mount_is_bind(p)) {
+ r = is_dir(p->what, /* follow = */ true);
+ if (r < 0 && r != -ENOENT)
+ log_unit_info_errno(UNIT(m), r, "Failed to determine type of bind mount source '%s', ignoring: %m", p->what);
+ else if (r == 0)
+ source_is_dir = false;
+ }
+
+ if (source_is_dir)
+ r = mkdir_p_label(m->where, m->directory_mode);
+ else
+ r = touch_file(m->where, /* parents = */ true, USEC_INFINITY, UID_INVALID, GID_INVALID, MODE_INVALID);
+ if (r < 0 && r != -EEXIST)
+ log_unit_warning_errno(UNIT(m), r, "Failed to create mount point '%s', ignoring: %m", m->where);
+
+ if (source_is_dir)
+ unit_warn_if_dir_nonempty(UNIT(m), m->where);
+ unit_warn_leftover_processes(UNIT(m), unit_log_leftover_process_start);
+
+ 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 */
+ if (p && mount_is_bind(p)) {
+ r = mkdir_p_label(p->what, m->directory_mode);
+ /* mkdir_p_label() can return -EEXIST if the target path exists and is not a directory - which is
+ * totally OK, in case the user wants us to overmount a non-directory inode. Also -EROFS can be
+ * returned on read-only filesystem. Moreover, -EACCES (and also maybe -EPERM?) may be returned
+ * when the path is on NFS. See issue #24120. All such errors will be logged in the debug level. */
+ if (r < 0 && r != -EEXIST)
+ log_unit_full_errno(UNIT(m),
+ (r == -EROFS || ERRNO_IS_PRIVILEGE(r)) ? LOG_DEBUG : LOG_WARNING,
+ r, "Failed to make bind mount source '%s', ignoring: %m", p->what);
+ }
+
+ if (p) {
+ _cleanup_free_ char *opts = NULL;
+
+ r = fstab_filter_options(p->options, "nofail\0" "noauto\0" "auto\0", NULL, 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 && m->read_write_only)
+ r = exec_command_append(m->control_command, "-w", 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 && m->read_write_only)
+ r = exec_command_append(m->control_command, "-w", 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,
+ MOUNT_CLEANING))
+ return -EAGAIN;
+
+ /* Already on it! */
+ if (IN_SET(m->state, MOUNT_MOUNTING, MOUNT_MOUNTING_DONE))
+ return 0;
+
+ assert(IN_SET(m->state, MOUNT_DEAD, MOUNT_FAILED));
+
+ 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;
+
+ case MOUNT_CLEANING:
+ /* If we are currently cleaning, then abort it, brutally. */
+ mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS);
+ return 0;
+
+ default:
+ assert_not_reached();
+ }
+}
+
+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(m);
+ assert(u);
+ assert(key);
+ assert(value);
+ assert(fds);
+
+ if (streq(key, "state")) {
+ MountState state;
+
+ state = mount_state_from_string(value);
+ if (state < 0)
+ log_unit_debug_errno(u, state, "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_errno(u, f, "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_errno(u, f, "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_errno(u, r, "Failed to parse n-retry-umount value: %s", value);
+
+ } else if (streq(key, "control-pid")) {
+
+ r = parse_pid(value, &m->control_pid);
+ if (r < 0)
+ log_unit_debug_errno(u, r, "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_errno(u, id, "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;
+
+ /* So here's the thing, we really want to know before /usr/bin/mount or /usr/bin/umount exit whether
+ * they established/remove a mount. This is important when mounting, but even more so when unmounting
+ * since we need to deal with nested mounts and otherwise cannot safely determine whether to repeat
+ * the unmounts. In theory, the kernel fires /proc/self/mountinfo changes off before returning from
+ * the mount() or umount() syscalls, and thus we should see the changes to the proc file before we
+ * process the waitid() for the /usr/bin/(u)mount processes. However, this is unfortunately racy: we
+ * have to waitid() for processes using P_ALL (since we need to reap unexpected children that got
+ * reparented to PID 1), but when using P_ALL we might end up reaping processes that terminated just
+ * instants ago, i.e. already after our last event loop iteration (i.e. after the last point we might
+ * have noticed /proc/self/mountinfo events via epoll). This means event loop priorities for
+ * processing SIGCHLD vs. /proc/self/mountinfo IO events are not as relevant as we want. To fix that
+ * race, let's explicitly scan /proc/self/mountinfo before we start processing /usr/bin/(u)mount
+ * dying. It's ugly, but it makes our ordering systematic again, and makes sure we always see
+ * /proc/self/mountinfo changes before our mount/umount exits. */
+ (void) mount_process_proc_self_mountinfo(u->manager);
+
+ 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();
+
+ 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,
+ "Mount process",
+ mount_exec_command_to_string(m->control_command_id),
+ f == MOUNT_SUCCESS,
+ 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;
+
+ case MOUNT_CLEANING:
+ if (m->clean_result == MOUNT_SUCCESS)
+ m->clean_result = f;
+
+ mount_enter_dead(m, MOUNT_SUCCESS);
+ break;
+
+ default:
+ assert_not_reached();
+ }
+
+ /* 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;
+
+ case MOUNT_CLEANING:
+ log_unit_warning(UNIT(m), "Cleaning timed out. killing.");
+
+ if (m->clean_result == MOUNT_SUCCESS)
+ m->clean_result = MOUNT_FAILURE_TIMEOUT;
+
+ mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, 0);
+ break;
+
+ default:
+ assert_not_reached();
+ }
+
+ 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_mountinfo(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;
+
+ r = mount_add_non_exec_dependencies(MOUNT(u));
+ if (r < 0)
+ return r;
+
+ /* 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) {
+
+ int r;
+
+ assert(u);
+ assert(ret_flags);
+
+ if (!MOUNT(u)->where) {
+ MOUNT(u)->where = strdup(where);
+ if (!MOUNT(u)->where)
+ return -ENOMEM;
+ }
+
+ /* In case we have multiple mounts established on the same mount point, let's merge flags set already
+ * for the current unit. Note that the flags field is reset on each iteration of reading
+ * /proc/self/mountinfo, hence we know for sure anything already set here is from the current
+ * iteration and thus worthy of taking into account. */
+ MountProcFlags flags =
+ MOUNT(u)->proc_flags | MOUNT_PROC_IS_MOUNTED;
+
+ r = update_parameters_proc_self_mountinfo(MOUNT(u), what, options, fstype);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ flags |= MOUNT_PROC_JUST_CHANGED;
+
+ /* There are two conditions when we consider a mount point just mounted: when we haven't seen it in
+ * /proc/self/mountinfo before or when MOUNT_MOUNTING is our current state. Why bother with the
+ * latter? Shouldn't that be covered by the former? No, during reload it is not because we might then
+ * encounter a new /proc/self/mountinfo in combination with an old mount unit state (since it stems
+ * from the serialized state), and need to catch up. Since we know that the MOUNT_MOUNTING state is
+ * reached when we wait for the mount to appear we hence can assume that if we are in it, we are
+ * actually seeing it established for the first time. */
+ if (!MOUNT(u)->from_proc_self_mountinfo || MOUNT(u)->state == MOUNT_MOUNTING)
+ 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. */
+ r = mount_add_non_exec_dependencies(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_struct_errno(
+ LOG_WARNING, r,
+ "MESSAGE_ID=" SD_MESSAGE_MOUNT_POINT_PATH_NOT_SUITABLE_STR,
+ "MOUNT_POINT=%s", where,
+ LOG_MESSAGE("Failed to generate valid unit name from mount point path '%s', ignoring mount point: %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 for '%s': %m", where);
+
+ /* 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 *table = NULL;
+ _cleanup_(mnt_free_iterp) struct libmnt_iter *iter = NULL;
+ int r;
+
+ assert(m);
+
+ r = libmount_parse(NULL, NULL, &table, &iter);
+ 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;
+
+ r = mnt_table_next_fs(table, iter, &fs);
+ if (r == 1)
+ break;
+ if (r < 0)
+ return log_error_errno(r, "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;
+
+ device_found_node(m, device, DEVICE_FOUND_MOUNT, DEVICE_FOUND_MOUNT);
+
+ (void) mount_setup_unit(m, device, path, options, fstype, set_flags);
+ }
+
+ return 0;
+}
+
+static void mount_shutdown(Manager *m) {
+ assert(m);
+
+ m->mount_event_source = sd_event_source_disable_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;
+
+ assert(m);
+ assert(u);
+
+ 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 int mount_on_ratelimit_expire(sd_event_source *s, void *userdata) {
+ Manager *m = ASSERT_PTR(userdata);
+ Job *j;
+
+ /* Let's enqueue all start jobs that were previously skipped because of active ratelimit. */
+ HASHMAP_FOREACH(j, m->jobs) {
+ if (j->unit->type != UNIT_MOUNT)
+ continue;
+
+ job_add_to_run_queue(j);
+ }
+
+ /* By entering ratelimited state we made all mount start jobs not runnable, now rate limit is over so
+ * let's make sure we dispatch them in the next iteration. */
+ manager_trigger_run_queue(m);
+
+ return 0;
+}
+
+static void mount_enumerate(Manager *m) {
+ int r;
+
+ assert(m);
+
+ mnt_init_debug(0);
+
+ if (!m->mount_monitor) {
+ unsigned mount_rate_limit_burst = 5;
+ 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;
+ }
+
+ /* Let users override the default (5 in 1s), as it stalls the boot sequence on busy systems. */
+ const char *e = secure_getenv("SYSTEMD_DEFAULT_MOUNT_RATE_LIMIT_BURST");
+ if (e) {
+ r = safe_atou(e, &mount_rate_limit_burst);
+ if (r < 0)
+ log_debug("Invalid value in $SYSTEMD_DEFAULT_MOUNT_RATE_LIMIT_BURST, ignoring: %s", e);
+ }
+
+ r = sd_event_source_set_ratelimit(m->mount_event_source, 1 * USEC_PER_SEC, mount_rate_limit_burst);
+ if (r < 0) {
+ log_error_errno(r, "Failed to enable rate limit for mount events: %m");
+ goto fail;
+ }
+
+ r = sd_event_source_set_ratelimit_expire_callback(m->mount_event_source, mount_on_ratelimit_expire);
+ if (r < 0) {
+ log_error_errno(r, "Failed to enable rate limit for mount events: %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 drain_libmount(Manager *m) {
+ bool rescan = false;
+ int r;
+
+ assert(m);
+
+ /* 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: r == 1 */
+ do {
+ r = mnt_monitor_next_change(m->mount_monitor, NULL, NULL);
+ if (r < 0)
+ return log_error_errno(r, "Failed to drain libmount events: %m");
+ if (r == 0)
+ rescan = true;
+ } while (r == 0);
+
+ return rescan;
+}
+
+static int mount_process_proc_self_mountinfo(Manager *m) {
+ _cleanup_set_free_ Set *around = NULL, *gone = NULL;
+ const char *what;
+ int r;
+
+ assert(m);
+
+ r = drain_libmount(m);
+ if (r <= 0)
+ return r;
+
+ 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_put_strdup_full(&gone, &path_hash_ops_free, 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_mountinfo(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;
+
+ case MOUNT_MOUNTING_DONE:
+ /* The mount command may add the corresponding proc mountinfo entry and
+ * then remove it because of an internal error. E.g., fuse.sshfs seems
+ * to do that when the connection fails. See #17617. To handle such the
+ * case, let's once set the state back to mounting. Then, the unit can
+ * correctly enter the failed state later in mount_sigchld(). */
+ mount_set_state(mount, MOUNT_MOUNTING);
+ 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_put_strdup_full(&around, &path_hash_ops_free, mount->parameters_proc_self_mountinfo.what) < 0)
+ log_oom();
+
+ /* Reset the flags for later calls */
+ mount->proc_flags = 0;
+ }
+
+ SET_FOREACH(what, gone) {
+ if (set_contains(around, what))
+ continue;
+
+ /* Let the device units know that the device is no longer mounted */
+ device_found_node(m, what, DEVICE_NOT_FOUND, DEVICE_FOUND_MOUNT);
+ }
+
+ return 0;
+}
+
+static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
+ Manager *m = ASSERT_PTR(userdata);
+
+ assert(revents & EPOLLIN);
+
+ return mount_process_proc_self_mountinfo(m);
+}
+
+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;
+ m->clean_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, m->control_pid, error);
+}
+
+static int mount_control_pid(Unit *u) {
+ Mount *m = MOUNT(u);
+
+ assert(m);
+
+ return m->control_pid;
+}
+
+static int mount_clean(Unit *u, ExecCleanMask mask) {
+ _cleanup_strv_free_ char **l = NULL;
+ Mount *m = MOUNT(u);
+ int r;
+
+ assert(m);
+ assert(mask != 0);
+
+ if (m->state != MOUNT_DEAD)
+ return -EBUSY;
+
+ r = exec_context_get_clean_directories(&m->exec_context, u->manager->prefix, mask, &l);
+ if (r < 0)
+ return r;
+
+ if (strv_isempty(l))
+ return -EUNATCH;
+
+ mount_unwatch_control_pid(m);
+ m->clean_result = MOUNT_SUCCESS;
+ m->control_command = NULL;
+ m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
+
+ r = mount_arm_timer(m, usec_add(now(CLOCK_MONOTONIC), m->exec_context.timeout_clean_usec));
+ if (r < 0)
+ goto fail;
+
+ r = unit_fork_and_watch_rm_rf(u, l, &m->control_pid);
+ if (r < 0)
+ goto fail;
+
+ mount_set_state(m, MOUNT_CLEANING);
+
+ return 0;
+
+fail:
+ log_unit_warning_errno(u, r, "Failed to initiate cleaning: %m");
+ m->clean_result = MOUNT_FAILURE_RESOURCES;
+ m->timer_event_source = sd_event_source_disable_unref(m->timer_event_source);
+ return r;
+}
+
+static int mount_can_clean(Unit *u, ExecCleanMask *ret) {
+ Mount *m = MOUNT(u);
+
+ assert(m);
+
+ return exec_context_get_clean_mask(&m->exec_context, ret);
+}
+
+static int mount_can_start(Unit *u) {
+ Mount *m = MOUNT(u);
+ int r;
+
+ assert(m);
+
+ r = unit_test_start_limit(u);
+ if (r < 0) {
+ mount_enter_dead(m, MOUNT_FAILURE_START_LIMIT_HIT);
+ return r;
+ }
+
+ return 1;
+}
+
+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",
+
+ .can_transient = true,
+ .can_fail = true,
+ .exclude_from_switch_root_serialization = true,
+
+ .init = mount_init,
+ .load = mount_load,
+ .done = mount_done,
+
+ .coldplug = mount_coldplug,
+ .catchup = mount_catchup,
+
+ .dump = mount_dump,
+
+ .start = mount_start,
+ .stop = mount_stop,
+ .reload = mount_reload,
+
+ .kill = mount_kill,
+ .clean = mount_clean,
+ .can_clean = mount_can_clean,
+
+ .serialize = mount_serialize,
+ .deserialize_item = mount_deserialize_item,
+
+ .active_state = mount_active_state,
+ .sub_state_to_string = mount_sub_state_to_string,
+
+ .will_restart = unit_will_restart_default,
+
+ .may_gc = mount_may_gc,
+ .is_extrinsic = mount_is_extrinsic,
+
+ .sigchld_event = mount_sigchld_event,
+
+ .reset_failed = mount_reset_failed,
+
+ .control_pid = mount_control_pid,
+
+ .bus_set_property = bus_mount_set_property,
+ .bus_commit_properties = bus_mount_commit_properties,
+
+ .get_timeout = mount_get_timeout,
+
+ .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.",
+ },
+ },
+
+ .can_start = mount_can_start,
+};