From fc00c656c96528112d05cf0edf8631bd5eaea446 Mon Sep 17 00:00:00 2001
From: Kacper <kacper@mail.openlinux.dev>
Date: Sun, 7 Dec 2025 20:10:31 +0100
Subject: Add build system scaffolding and libc headers

---
 include/arch/x86_64/linux/dlm_device.h | 108 +++++++++++++++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 include/arch/x86_64/linux/dlm_device.h

(limited to 'include/arch/x86_64/linux/dlm_device.h')

diff --git a/include/arch/x86_64/linux/dlm_device.h b/include/arch/x86_64/linux/dlm_device.h
new file mode 100644
index 00000000..b68fb454
--- /dev/null
+++ b/include/arch/x86_64/linux/dlm_device.h
@@ -0,0 +1,108 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/******************************************************************************
+*******************************************************************************
+**
+**  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
+**  Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
+**
+**  This copyrighted material is made available to anyone wishing to use,
+**  modify, copy, or redistribute it subject to the terms and conditions
+**  of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#ifndef _LINUX_DLM_DEVICE_H
+#define _LINUX_DLM_DEVICE_H
+
+/* This is the device interface for dlm, most users will use a library
+ * interface.
+ */
+
+#include <linux/dlm.h>
+#include <linux/types.h>
+
+#define DLM_USER_LVB_LEN 32
+
+/* Version of the device interface */
+#define DLM_DEVICE_VERSION_MAJOR 6
+#define DLM_DEVICE_VERSION_MINOR 0
+#define DLM_DEVICE_VERSION_PATCH 2
+
+/* struct passed to the lock write */
+struct dlm_lock_params {
+	__u8 mode;
+	__u8 namelen;
+	__u16 unused;
+	__u32 flags;
+	__u32 lkid;
+	__u32 parent;
+	__u64 xid;
+	__u64 timeout;
+	void *castparam;
+	void *castaddr;
+	void *bastparam;
+	void *bastaddr;
+	struct dlm_lksb *lksb;
+	char lvb[DLM_USER_LVB_LEN];
+	char name[];
+};
+
+struct dlm_lspace_params {
+	__u32 flags;
+	__u32 minor;
+	char name[];
+};
+
+struct dlm_purge_params {
+	__u32 nodeid;
+	__u32 pid;
+};
+
+struct dlm_write_request {
+	__u32 version[3];
+	__u8 cmd;
+	__u8 is64bit;
+	__u8 unused[2];
+
+	union {
+		struct dlm_lock_params lock;
+		struct dlm_lspace_params lspace;
+		struct dlm_purge_params purge;
+	} i;
+};
+
+struct dlm_device_version {
+	__u32 version[3];
+};
+
+/* struct read from the "device" fd,
+   consists mainly of userspace pointers for the library to use */
+
+struct dlm_lock_result {
+	__u32 version[3];
+	__u32 length;
+	void *user_astaddr;
+	void *user_astparam;
+	struct dlm_lksb *user_lksb;
+	struct dlm_lksb lksb;
+	__u8 bast_mode;
+	__u8 unused[3];
+	/* Offsets may be zero if no data is present */
+	__u32 lvb_offset;
+};
+
+/* Commands passed to the device */
+#define DLM_USER_LOCK		  1
+#define DLM_USER_UNLOCK		  2
+#define DLM_USER_QUERY		  3
+#define DLM_USER_CREATE_LOCKSPACE 4
+#define DLM_USER_REMOVE_LOCKSPACE 5
+#define DLM_USER_PURGE		  6
+#define DLM_USER_DEADLOCK	  7
+
+/* Lockspace flags */
+#define DLM_USER_LSFLG_AUTOFREE	 1
+#define DLM_USER_LSFLG_FORCEFREE 2
+
+#endif
-- 
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