1 files changed, 43 insertions, 0 deletions
diff --git a/src/core/device.h b/src/core/device.h
new file mode 100644
index 0000000..3062be7
--- /dev/null
+++ b/src/core/device.h
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+#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;
+
+        /* 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);