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diff --git a/src/core/device.h b/src/core/device.h
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+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include "unit.h"
+
+typedef struct Device Device;
+
+/* A mask specifying where we have seen the device currently. This is a bitmask because the device might show up
+ * asynchronously from each other at various places. For example, in very common case a device might already be mounted
+ * before udev finished probing it (think: a script setting up a loopback block device, formatting it and mounting it
+ * in quick succession). Hence we need to track precisely where it is already visible and where not. */
+typedef enum DeviceFound {
+ DEVICE_NOT_FOUND = 0,
+ DEVICE_FOUND_UDEV = 1 << 0, /* The device has shown up in the udev database */
+ DEVICE_FOUND_MOUNT = 1 << 1, /* The device has shown up in /proc/self/mountinfo */
+ DEVICE_FOUND_SWAP = 1 << 2, /* The device has shown up in /proc/swaps */
+ DEVICE_FOUND_MASK = DEVICE_FOUND_UDEV|DEVICE_FOUND_MOUNT|DEVICE_FOUND_SWAP,
+} DeviceFound;
+
+struct Device {
+ Unit meta;
+
+ char *sysfs, *deserialized_sysfs;
+ char *path; /* syspath, device node, alias, or devlink */
+
+ /* In order to be able to distinguish dependencies on different device nodes we might end up creating multiple
+ * devices for the same sysfs path. We chain them up here. */
+ LIST_FIELDS(struct Device, same_sysfs);
+
+ DeviceState state, deserialized_state;
+ DeviceFound found, deserialized_found, enumerated_found;
+
+ bool bind_mounts;
+
+ /* The SYSTEMD_WANTS udev property for this device the last time we saw it */
+ char **wants_property;
+};
+
+extern const UnitVTable device_vtable;
+
+void device_found_node(Manager *m, const char *node, DeviceFound found, DeviceFound mask);
+bool device_shall_be_bound_by(Unit *device, Unit *u);
+
+DEFINE_CAST(DEVICE, Device);