[PATCH 6 of 6] dm-userspace backend script and xmexample change

[Ryan Grimm <grimm@us.ibm.com>]

Signed-off-by: Ryan Grimm <grimm@us.ibm.com>
Signed-off-by: Dan Smith <danms@us.ibm.com>

# HG changeset patch
# User Ryan Grimm <grimm@us.ibm.com>
# Date 1156536098 18000
# Node ID 55e3795e5bc46ea6a205e60ebf27ed9faf306616
# Parent  be4574d288030b64d4623dd33505d0990185a6b9
dm-userspace backend script and xmexample change

diff -r be4574d28803 -r 55e3795e5bc4 tools/examples/Makefile
--- a/tools/examples/Makefile	Fri Aug 25 15:01:36 2006 -0500
+++ b/tools/examples/Makefile	Fri Aug 25 15:01:38 2006 -0500
@@ -32,6 +32,7 @@ XEN_SCRIPTS += vtpm vtpm-delete
 XEN_SCRIPTS += vtpm vtpm-delete
 XEN_SCRIPTS += xen-hotplug-cleanup
 XEN_SCRIPTS += external-device-migrate
+XEN_SCRIPTS += block-dmu
 XEN_SCRIPT_DATA = xen-script-common.sh locking.sh logging.sh
 XEN_SCRIPT_DATA += xen-hotplug-common.sh xen-network-common.sh vif-common.sh
 XEN_SCRIPT_DATA += block-common.sh vtpm-common.sh vtpm-hotplug-common.sh
diff -r be4574d28803 -r 55e3795e5bc4 tools/examples/README
--- a/tools/examples/README	Fri Aug 25 15:01:36 2006 -0500
+++ b/tools/examples/README	Fri Aug 25 15:01:38 2006 -0500
@@ -13,6 +13,7 @@ block-common.sh     - sourced by block, 
 block-common.sh     - sourced by block, block-*
 block-enbd          - binds/unbinds network block devices
 block-nbd           - binds/unbinds network block devices
+block-dmu           - binds/unbinds dm-userspace devices
 external-device-migrate - called by xend for migrating external devices
 locking.sh          - locking functions to prevent concurrent access to
                       critical sections inside script files
diff -r be4574d28803 -r 55e3795e5bc4 tools/examples/xmexample1
--- a/tools/examples/xmexample1	Fri Aug 25 15:01:36 2006 -0500
+++ b/tools/examples/xmexample1	Fri Aug 25 15:01:38 2006 -0500
@@ -64,6 +64,13 @@ vif = [ '' ]
 # and MODE is r for read-only, w for read-write.
 
 disk = [ 'phy:hda1,hda1,w' ]
+
+#----------------------------------------------------------------------------
+# Using a dm-userspace backed device 
+# for dmu, the syntax is dmu:<plugin>:<cow file>:<base file>
+# if <cow file> does not exist, it is created and <base file> is used
+# as a base.  if <cow file> does exist, <base file> is ignored.  
+# disk = [ 'dmu:dscow:/path/to/domain.dscow:/path/to/domain.img,hda1,w']
 
 #----------------------------------------------------------------------------
 # Define to which TPM instance the user domain should communicate.
diff -r be4574d28803 -r 55e3795e5bc4 tools/examples/block-dmu
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/examples/block-dmu	Fri Aug 25 15:01:38 2006 -0500
@@ -0,0 +1,57 @@
+#!/bin/sh
+#
+# Copyright (C) International Business Machines Corp., 2006
+# Author: Ryan Grimm <grimm@us.ibm.com>
+
+dir=$(dirname "$0")
+. "$dir/block-common.sh"
+
+p=$(xenstore_read "$XENBUS_PATH/params")
+mode=$(xenstore_read "$XENBUS_PATH/mode")
+
+wait_for_cowd_exit() {
+	while ps ax | grep -v grep | grep cowd | grep -q $1; do
+		sleep 1
+	done
+}
+
+case "$command" in 
+ 	add)
+		plugin=$(echo $p | cut -d: -f1)
+		dmu_file=$(echo $p | cut -d: -f2)
+		base_file=$(echo $p | cut -d: -f3)
+
+		domain_name=$(xenstore_read "$XENBUS_PATH/domain")
+		domain_dev=$(xenstore_read "$XENBUS_PATH/dev")
+		target="$domain_name""_""$domain_dev"
+		md_dev="/dev/mapper/$target"
+
+		lsmod | grep -q dm_user || modprobe dm-user || fatal \
+			'cannot load module dm-user'
+
+		wait_for_cowd_exit $target
+
+		if [ ! -e $dmu_file ]
+		then
+			dscow_tool -c $dmu_file $base_file || fatal \
+				'creation of $dmu_file failed'
+		fi
+
+		cowd --sync --pidfile=/var/run/cowd.$target.pid -p $plugin \
+			$target $dmu_file || fatal 'cowd failed'
+
+        	xenstore_write "$XENBUS_PATH/node" "$target"
+
+		claim_lock "block"
+		write_dev $md_dev
+	        release_lock "block"
+		exit 0
+		;;
+
+	remove)
+        	node=$(xenstore_read "$XENBUS_PATH/node")
+		cowd_pid=$(cat "/var/run/cowd.$node.pid")
+		kill $cowd_pid
+		exit 0
+		;;
+esac