[DLM] add lock timeouts and warnings [2/6]

New features: lock timeouts and time warnings.  If the DLM_LKF_TIMEOUT
flag is set, then the request/conversion will be canceled after waiting
the specified number of centiseconds (specified per lock).  This feature
is only available for locks requested through libdlm (can be enabled for
kernel dlm users if there's a use for it.)

If the new DLM_LSFL_TIMEWARN flag is set when creating the lockspace, then
a warning message will be sent to userspace (using genetlink) after a
request/conversion has been waiting for a given number of centiseconds
(configurable per node).  The time warnings will be used in the future
to do deadlock detection in userspace.

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

3 files changed, 61 insertions, 3 deletions

diff --git a/include/linux/Kbuild b/include/linux/Kbuild
index f317c270d4bf..afae306b177c 100644
--- a/include/linux/Kbuild
+++ b/include/linux/Kbuild
@@ -49,6 +49,7 @@ header-y += consolemap.h
 header-y += const.h
 header-y += cycx_cfm.h
 header-y += dlm_device.h
+header-y += dlm_netlink.h
 header-y += dm-ioctl.h
 header-y += dn.h
 header-y += dqblk_v1.h
diff --git a/include/linux/dlm.h b/include/linux/dlm.h
index 1b1dcb9a40bb..975f17d8aa53 100644
--- a/include/linux/dlm.h
+++ b/include/linux/dlm.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
@@ -149,6 +149,7 @@
 #define DLM_LKF_ALTPR           0x00008000
 #define DLM_LKF_ALTCW           0x00010000
 #define DLM_LKF_FORCEUNLOCK     0x00020000
+#define DLM_LKF_TIMEOUT         0x00040000
 
 /*
  * Some return codes that are not in errno.h
@@ -199,11 +200,11 @@ struct dlm_lksb {
         char *   sb_lvbptr;
 };
 
+#define DLM_LSFL_NODIR          0x00000001
+#define DLM_LSFL_TIMEWARN       0x00000002
 
 #ifdef __KERNEL__
 
-#define DLM_LSFL_NODIR          0x00000001
-
 /*
  * dlm_new_lockspace
  *
diff --git a/include/linux/dlm_netlink.h b/include/linux/dlm_netlink.h
new file mode 100644
index 000000000000..19276332707a
--- /dev/null
+++ b/include/linux/dlm_netlink.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 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 _DLM_NETLINK_H
+#define _DLM_NETLINK_H
+
+enum {
+        DLM_STATUS_WAITING = 1,
+        DLM_STATUS_GRANTED = 2,
+        DLM_STATUS_CONVERT = 3,
+};
+
+#define DLM_LOCK_DATA_VERSION 1
+
+struct dlm_lock_data {
+        uint16_t version;
+        uint32_t lockspace_id;
+        int nodeid;
+        int ownpid;
+        uint32_t id;
+        uint32_t remid;
+        uint64_t xid;
+        int8_t status;
+        int8_t grmode;
+        int8_t rqmode;
+        unsigned long timestamp;
+        int resource_namelen;
+        char resource_name[DLM_RESNAME_MAXLEN];
+};
+
+enum {
+        DLM_CMD_UNSPEC = 0,
+        DLM_CMD_HELLO,          /* user->kernel */
+        DLM_CMD_TIMEOUT,        /* kernel->user */
+        __DLM_CMD_MAX,
+};
+
+#define DLM_CMD_MAX (__DLM_CMD_MAX - 1)
+
+enum {
+        DLM_TYPE_UNSPEC = 0,
+        DLM_TYPE_LOCK,
+        __DLM_TYPE_MAX,
+};
+
+#define DLM_TYPE_MAX (__DLM_TYPE_MAX - 1)
+
+#define DLM_GENL_VERSION 0x1
+#define DLM_GENL_NAME "DLM"
+
+#endif /* _DLM_NETLINK_H */