[DLM] Consolidate transport protocols

This patch consolidates the TCP & SCTP protocols for the DLM into a single file
and makes it switchable at run-time (well, at least before the DLM actually
starts up!)

For RHEL5 this patch requires Neil Horman's patch that expands the in-kernel
socket API but that has already been twice ACKed so it should be OK.

The patch adds a new lowcomms.c file that replaces the existing lowcomms-sctp.c
& lowcomms-tcp.c files.

Signed-off-By: Patrick Caulfield <pcaulfie@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

fs/dlm/Kconfig

@@ -3,36 +3,19 @@ menu "Distributed Lock Manager"
 
 config DLM
 	tristate "Distributed Lock Manager (DLM)"
-	depends on SYSFS && (IPV6 || IPV6=n)
+	depends on IPV6 || IPV6=n
 	select CONFIGFS_FS
-	select IP_SCTP if DLM_SCTP
+	select IP_SCTP
 	help
-	  A general purpose distributed lock manager for kernel or userspace
-	  applications.
-
-choice
-	prompt "Select DLM communications protocol"
-	depends on DLM
-	default DLM_TCP
-	help
-	  The DLM Can use TCP or SCTP for it's network communications.
-	  SCTP supports multi-homed operations whereas TCP doesn't.
-	  However, SCTP seems to have stability problems at the moment.
-
-config DLM_TCP
-	bool "TCP/IP"
-
-config DLM_SCTP
-	bool "SCTP"
-
-endchoice
+	A general purpose distributed lock manager for kernel or userspace
+	applications.
 
 config DLM_DEBUG
 	bool "DLM debugging"
 	depends on DLM
 	help
-	  Under the debugfs mount point, the name of each lockspace will
-	  appear as a file in the "dlm" directory.  The output is the
-	  list of resource and locks the local node knows about.
+	Under the debugfs mount point, the name of each lockspace will
+	appear as a file in the "dlm" directory.  The output is the
+	list of resource and locks the local node knows about.
 
 endmenu