/* SPDX-License-Identifier: LGPL-2.1+ */
#pragma once
-/***
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
+#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,
- DEVICE_FOUND_MOUNT = 2,
- DEVICE_FOUND_SWAP = 4,
+ DEVICE_NOT_FOUND = 0,
+ DEVICE_FOUND_UDEV = 1U << 1, /* The device has shown up in the udev database */
+ DEVICE_FOUND_MOUNT = 1U << 2, /* The device has shown up in /proc/self/mountinfo */
+ DEVICE_FOUND_SWAP = 1U << 3, /* 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;
- DeviceFound found;
- /* 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. */
+ /* 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;
};
extern const UnitVTable device_vtable;
-int device_found_node(Manager *m, const char *node, bool add, DeviceFound found, bool now);
+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);