[DLM] dlm_device interface changes [3/6]
Change the user/kernel device interface used by libdlm:
- Add ability for userspace to check the version of the interface. libdlm
can now adapt to different versions of the kernel interface.
- Increase the size of the flags passed in a lock request so all possible
flags can be used from userspace.
- Add an opaque "xid" value for each lock. This "transaction id" will be
used later to associate locks with each other during deadlock detection.
- Add a "timeout" value for each lock. This is used along with the
DLM_LKF_TIMEOUT flag.
Also, remove a fragment of unused code in device_read().
This patch requires updating libdlm which is backward compatible with
older kernels.
Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/include/linux/dlm_device.h b/include/linux/dlm_device.h
index c2735ca..f7b9b57 100644
--- a/include/linux/dlm_device.h
+++ b/include/linux/dlm_device.h
@@ -2,7 +2,7 @@
*******************************************************************************
**
** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
-** Copyright (C) 2004-2005 Red Hat, Inc. 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
@@ -18,21 +18,24 @@
#define DLM_USER_LVB_LEN 32
/* Version of the device interface */
-#define DLM_DEVICE_VERSION_MAJOR 5
-#define DLM_DEVICE_VERSION_MINOR 1
+#define DLM_DEVICE_VERSION_MAJOR 6
+#define DLM_DEVICE_VERSION_MINOR 0
#define DLM_DEVICE_VERSION_PATCH 0
/* struct passed to the lock write */
struct dlm_lock_params {
__u8 mode;
__u8 namelen;
- __u16 flags;
+ __u16 unused;
+ __u32 flags;
__u32 lkid;
__u32 parent;
- void __user *castparam;
+ __u64 xid;
+ __u64 timeout;
+ void __user *castparam;
void __user *castaddr;
void __user *bastparam;
- void __user *bastaddr;
+ void __user *bastaddr;
struct dlm_lksb __user *lksb;
char lvb[DLM_USER_LVB_LEN];
char name[0];
@@ -62,9 +65,15 @@
} 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 * user_astaddr;
void __user * user_astparam;