diff -purN linux-2.6.24.2/drivers/md/dm.c linux-2.6.24.2-ddsnap.base/drivers/md/dm.c
--- linux-2.6.24.2/drivers/md/dm.c	2008-02-10 21:51:11.000000000 -0800
+++ linux-2.6.24.2-ddsnap.base/drivers/md/dm.c	2008-06-02 17:40:43.000000000 -0700
@@ -889,6 +889,15 @@ static int dm_any_congested(void *conges
 	return r;
 }
 
+unsigned dm_inflight_total(struct dm_target *target)
+{
+	struct mapped_device *md = dm_table_get_md(target->table);
+	int inflight = dm_disk(md)->in_flight;
+	dm_put(md);
+	return inflight;
+}
+EXPORT_SYMBOL_GPL(dm_inflight_total);
+
 /*-----------------------------------------------------------------
  * An IDR is used to keep track of allocated minor numbers.
  *---------------------------------------------------------------*/
diff -purN linux-2.6.24.2/drivers/md/dm-ioctl.c linux-2.6.24.2-ddsnap.base/drivers/md/dm-ioctl.c
--- linux-2.6.24.2/drivers/md/dm-ioctl.c	2008-06-02 17:41:33.000000000 -0700
+++ linux-2.6.24.2-ddsnap.base/drivers/md/dm-ioctl.c	2008-06-02 16:53:58.000000000 -0700
@@ -1545,3 +1545,4 @@ out:
 
 	return r;
 }
+EXPORT_SYMBOL_GPL(dm_copy_name_and_uuid);
diff -purN linux-2.6.24.2/drivers/md/Kconfig linux-2.6.24.2-ddsnap.base/drivers/md/Kconfig
--- linux-2.6.24.2/drivers/md/Kconfig	2008-06-02 17:41:33.000000000 -0700
+++ linux-2.6.24.2-ddsnap.base/drivers/md/Kconfig	2008-06-02 16:53:41.000000000 -0700
@@ -288,4 +288,13 @@ config DM_UEVENT
 	---help---
 	Generate udev events for DM events.
 
+config DM_DDSNAP
+	tristate "Distributed Data Snapshot target (EXPERIMENTAL)"
+	depends on BLK_DEV_DM && EXPERIMENTAL
+	---help---
+	  This device-mapper target allows you to take multiple simultaneous
+	  read/write snapshots of a clustered or non-clustered block devices.
+	  If unsure, say N.
+
+
 endif # MD
diff -purN linux-2.6.24.2/drivers/md/Makefile linux-2.6.24.2-ddsnap.base/drivers/md/Makefile
--- linux-2.6.24.2/drivers/md/Makefile	2008-06-02 17:41:33.000000000 -0700
+++ linux-2.6.24.2-ddsnap.base/drivers/md/Makefile	2008-06-02 16:53:41.000000000 -0700
@@ -41,6 +41,7 @@ obj-$(CONFIG_DM_MULTIPATH_RDAC)	+= dm-rd
 obj-$(CONFIG_DM_SNAPSHOT)	+= dm-snapshot.o
 obj-$(CONFIG_DM_MIRROR)		+= dm-mirror.o
 obj-$(CONFIG_DM_ZERO)		+= dm-zero.o
+obj-$(CONFIG_DM_DDSNAP)		+= dm-ddsnap.o
 
 quiet_cmd_unroll = UNROLL  $@
       cmd_unroll = $(PERL) $(srctree)/$(src)/unroll.pl $(UNROLL) \
diff -purN linux-2.6.24.2/include/linux/device-mapper.h linux-2.6.24.2-ddsnap.base/include/linux/device-mapper.h
--- linux-2.6.24.2/include/linux/device-mapper.h	2008-02-10 21:51:11.000000000 -0800
+++ linux-2.6.24.2-ddsnap.base/include/linux/device-mapper.h	2008-06-02 17:38:52.000000000 -0700
@@ -196,6 +196,7 @@ int dm_copy_name_and_uuid(struct mapped_
 struct gendisk *dm_disk(struct mapped_device *md);
 int dm_suspended(struct mapped_device *md);
 int dm_noflush_suspending(struct dm_target *ti);
+unsigned dm_inflight_total(struct dm_target *target);
 
 /*
  * Geometry functions.
diff -purN linux-2.6.24.2/include/linux/prctl.h linux-2.6.24.2-ddsnap.base/include/linux/prctl.h
--- linux-2.6.24.2/include/linux/prctl.h	2008-06-02 17:41:33.000000000 -0700
+++ linux-2.6.24.2-ddsnap.base/include/linux/prctl.h	2008-06-02 16:53:41.000000000 -0700
@@ -63,4 +63,8 @@
 #define PR_GET_SECCOMP	21
 #define PR_SET_SECCOMP	22
 
+/* set process less throttleL: see PF_LESS_THROTTLE */
+#define PR_SET_LESS_THROTTLE           23
+#define PR_SET_MEMALLOC			24
+
 #endif /* _LINUX_PRCTL_H */
diff -purN linux-2.6.24.2/kernel/sys.c linux-2.6.24.2-ddsnap.base/kernel/sys.c
--- linux-2.6.24.2/kernel/sys.c	2008-06-02 17:41:33.000000000 -0700
+++ linux-2.6.24.2-ddsnap.base/kernel/sys.c	2008-06-02 16:53:41.000000000 -0700
@@ -1741,7 +1741,16 @@ asmlinkage long sys_prctl(int option, un
 		case PR_SET_SECCOMP:
 			error = prctl_set_seccomp(arg2);
 			break;
-
+		case PR_SET_LESS_THROTTLE: {
+			current->flags |= PF_LESS_THROTTLE;
+			return 0;
+		}
+			
+		case PR_SET_MEMALLOC: {
+			current->flags |= PF_MEMALLOC;
+			printk("set PF_MEMALLOC for process %s[%i]\n", current->comm, current->pid);
+			return 0;
+		}
 		default:
 			error = -EINVAL;
 			break;