diff -Nru device-mapper.1.02.27/lib/.exported_symbols device-mapper.working//lib/.exported_symbols
--- device-mapper.1.02.27/lib/.exported_symbols	2008-04-20 08:11:08.000000000 +0800
+++ device-mapper.working//lib/.exported_symbols	2009-10-19 15:24:48.000000000 +0800
@@ -49,6 +49,7 @@
 dm_tree_node_get_uuid
 dm_tree_node_get_info
 dm_tree_node_get_context
+dm_tree_node_size_changed
 dm_tree_node_num_children
 dm_tree_node_num_parents
 dm_tree_find_node
diff -Nru device-mapper.1.02.27/lib/ioctl/libdm-iface.c device-mapper.working//lib/ioctl/libdm-iface.c
--- device-mapper.1.02.27/lib/ioctl/libdm-iface.c	2009-10-19 15:25:24.000000000 +0800
+++ device-mapper.working//lib/ioctl/libdm-iface.c	2009-10-19 15:20:30.000000000 +0800
@@ -1568,6 +1568,11 @@
 	return r;
 }
 
+uint64_t dm_task_get_existing_table_size(struct dm_task *dmt)
+{
+	return dmt->existing_table_size;
+}
+
 static int _reload_with_suppression_v4(struct dm_task *dmt)
 {
 	struct dm_task *task;
@@ -1601,6 +1606,12 @@
 		return r;
 	}
 
+	/* Store existing table size */
+	t2 = task->head;
+	while (t2 && t2->next)
+		t2 = t2->next;
+	dmt->existing_table_size = t2 ? t2->start + t2->length : 0;
+
 	if ((task->dmi.v4->flags & DM_READONLY_FLAG) ? 1 : 0 != dmt->read_only)
 		goto no_match;
 
diff -Nru device-mapper.1.02.27/lib/ioctl/libdm-targets.h device-mapper.working//lib/ioctl/libdm-targets.h
--- device-mapper.1.02.27/lib/ioctl/libdm-targets.h	2007-11-28 04:57:05.000000000 +0800
+++ device-mapper.working//lib/ioctl/libdm-targets.h	2009-10-19 15:20:30.000000000 +0800
@@ -58,6 +58,7 @@
 	int no_open_count;
 	int skip_lockfs;
 	int suppress_identical_reload;
+	uint64_t existing_table_size;
 
 	char *uuid;
 };
@@ -69,5 +70,6 @@
 };
 
 int dm_check_version(void);
+uint64_t dm_task_get_existing_table_size(struct dm_task *dmt);
 
 #endif
diff -Nru device-mapper.1.02.27/lib/libdevmapper.h device-mapper.working//lib/libdevmapper.h
--- device-mapper.1.02.27/lib/libdevmapper.h	2008-06-25 06:53:48.000000000 +0800
+++ device-mapper.working//lib/libdevmapper.h	2009-10-19 15:24:32.000000000 +0800
@@ -287,6 +287,7 @@
 const char *dm_tree_node_get_uuid(struct dm_tree_node *node);
 const struct dm_info *dm_tree_node_get_info(struct dm_tree_node *node);
 void *dm_tree_node_get_context(struct dm_tree_node *node);
+int dm_tree_node_size_changed(struct dm_tree_node *dnode);
 
 /*
  * Returns the number of children of the given node (excluding the root node).
diff -Nru device-mapper.1.02.27/lib/libdm-deptree.c device-mapper.working//lib/libdm-deptree.c
--- device-mapper.1.02.27/lib/libdm-deptree.c	2008-06-25 22:24:17.000000000 +0800
+++ device-mapper.working//lib/libdm-deptree.c	2009-10-19 15:24:08.000000000 +0800
@@ -99,6 +99,7 @@
 	uint32_t read_ahead_flags;
 
 	unsigned segment_count;
+	unsigned size_changed;
 	struct list segs;
 
 	const char *new_name;
@@ -603,6 +604,7 @@
 		dnode->props.major = major;
 		dnode->props.minor = minor;
 		dnode->props.new_name = NULL;
+		dnode->props.size_changed = 0;
 	} else if (strcmp(name, dnode->name)) {
 		/* Do we need to rename node? */
 		if (!(dnode->props.new_name = dm_pool_strdup(dtree->mem, name))) {
@@ -656,6 +658,11 @@
 	return node->context;
 }
 
+int dm_tree_node_size_changed(struct dm_tree_node *dnode)
+{
+	return dnode->props.size_changed;
+}
+
 int dm_tree_node_num_children(struct dm_tree_node *node, uint32_t inverted)
 {
 	if (inverted) {
@@ -1493,6 +1500,13 @@
 		if (r && !dnode->info.inactive_table)
 			log_verbose("Suppressed %s identical table reload.",
 				    dnode->name);
+
+		if ((dnode->props.size_changed =
+		     (dm_task_get_existing_table_size(dmt) == seg_start) ? 0 : 1))
+			log_debug("Table size changed from %" PRIu64 " to %"
+				  PRIu64 " for %s",
+				  dm_task_get_existing_table_size(dmt),
+				  seg_start, dnode->name);
 	}
 
 	dnode->props.segment_count = 0;
@@ -1504,8 +1518,8 @@
 }
 
 int dm_tree_preload_children(struct dm_tree_node *dnode,
-				 const char *uuid_prefix,
-				 size_t uuid_prefix_len)
+			     const char *uuid_prefix,
+			     size_t uuid_prefix_len)
 {
 	void *handle = NULL;
 	struct dm_tree_node *child;
@@ -1540,8 +1554,12 @@
 			}
 		}
 
-		/* Resume device immediately if it has parents */
-		if (!dm_tree_node_num_children(child, 1))
+		/* Propagate device size change change */
+		if (child->props.size_changed)
+			dnode->props.size_changed = 1;
+
+		/* Resume device immediately if it has parents and its size changed */
+		if (!dm_tree_node_num_children(child, 1) || !child->props.size_changed)
 			continue;
 
 		if (!child->info.inactive_table && !child->info.suspended)