Use a string instead of an integer to specify the exception store type.

It will be used for shared snapshots.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

---
 lib/activate/dev_manager.c |    2 +-
 libdm/libdevmapper.h       |    2 +-
 libdm/libdm-deptree.c      |   22 +++++++++++++---------
 3 files changed, 15 insertions(+), 11 deletions(-)

Index: LVM2.2.02.85/lib/activate/dev_manager.c
===================================================================
--- LVM2.2.02.85.orig/lib/activate/dev_manager.c	2011-05-20 14:56:55.000000000 +0200
+++ LVM2.2.02.85/lib/activate/dev_manager.c	2011-05-23 15:58:54.000000000 +0200
@@ -1265,7 +1265,7 @@ static int _add_snapshot_target_to_dtree
 			return_0;
 	}
 	else if (!dm_tree_node_add_snapshot_target(dnode, size, origin_dlid,
-						   cow_dlid, 1, snap_seg->chunk_size))
+						   cow_dlid, "P", snap_seg->chunk_size))
 		return_0;
 
 	return 1;
Index: LVM2.2.02.85/libdm/libdm-deptree.c
===================================================================
--- LVM2.2.02.85.orig/libdm/libdm-deptree.c	2011-05-20 14:55:49.000000000 +0200
+++ LVM2.2.02.85/libdm/libdm-deptree.c	2011-05-23 15:58:55.000000000 +0200
@@ -102,7 +102,7 @@ struct load_segment {
 
 	uint32_t stripe_size;		/* Striped */
 
-	int persistent;			/* Snapshot */
+	const char *exception_store;	/* Snapshot */
 	uint32_t chunk_size;		/* Snapshot */
 	struct dm_tree_node *cow;	/* Snapshot */
 	struct dm_tree_node *origin;	/* Snapshot + Snapshot origin */
@@ -1696,8 +1696,8 @@ static int _emit_segment_line(struct dm_
 			return_0;
 		if (!_build_dev_string(cowbuf, sizeof(cowbuf), seg->cow))
 			return_0;
-		EMIT_PARAMS(pos, "%s %s %c %d", originbuf, cowbuf,
-			    seg->persistent ? 'P' : 'N', seg->chunk_size);
+		EMIT_PARAMS(pos, "%s %s %s %d", originbuf, cowbuf,
+			    seg->exception_store, seg->chunk_size);
 		break;
 	case SEG_SNAPSHOT_ORIGIN:
 		if (!_build_dev_string(originbuf, sizeof(originbuf), seg->origin))
@@ -1971,7 +1971,7 @@ static struct load_segment *_add_segment
 	seg->area_count = 0;
 	dm_list_init(&seg->areas);
 	seg->stripe_size = 0;
-	seg->persistent = 0;
+	seg->exception_store = NULL;
 	seg->chunk_size = 0;
 	seg->cow = NULL;
 	seg->origin = NULL;
@@ -2013,7 +2013,7 @@ static int _add_snapshot_target(struct d
 				   const char *origin_uuid,
 				   const char *cow_uuid,
 				   const char *merge_uuid,
-				   int persistent,
+				   const char *exception_store,
 				   uint32_t chunk_size)
 {
 	struct load_segment *seg;
@@ -2043,7 +2043,11 @@ static int _add_snapshot_target(struct d
 	if (!_link_tree_nodes(node, cow_node))
 		return_0;
 
-	seg->persistent = persistent ? 1 : 0;
+	seg->exception_store = dm_pool_strdup(node->dtree->mem, exception_store);
+	if (!seg->exception_store) {
+		log_error("exception_store allocation failed");
+		return_0;
+	}
 	seg->chunk_size = chunk_size;
 
 	if (merge_uuid) {
@@ -2071,11 +2075,11 @@ int dm_tree_node_add_snapshot_target(str
 				     uint64_t size,
 				     const char *origin_uuid,
 				     const char *cow_uuid,
-				     int persistent,
+                                     const char *exception_store,
 				     uint32_t chunk_size)
 {
 	return _add_snapshot_target(node, size, origin_uuid, cow_uuid,
-				    NULL, persistent, chunk_size);
+				    NULL, exception_store, chunk_size);
 }
 
 int dm_tree_node_add_snapshot_merge_target(struct dm_tree_node *node,
@@ -2086,7 +2090,7 @@ int dm_tree_node_add_snapshot_merge_targ
 					   uint32_t chunk_size)
 {
 	return _add_snapshot_target(node, size, origin_uuid, cow_uuid,
-				    merge_uuid, 1, chunk_size);
+				    merge_uuid, "P", chunk_size);
 }
 
 int dm_tree_node_add_error_target(struct dm_tree_node *node,
Index: LVM2.2.02.85/libdm/libdevmapper.h
===================================================================
--- LVM2.2.02.85.orig/libdm/libdevmapper.h	2011-05-20 14:55:47.000000000 +0200
+++ LVM2.2.02.85/libdm/libdevmapper.h	2011-05-23 15:58:55.000000000 +0200
@@ -408,7 +408,7 @@ int dm_tree_node_add_snapshot_target(str
 					uint64_t size,
 					const char *origin_uuid,
 					const char *cow_uuid,
-					int persistent,
+					const char *exception_store,
 					uint32_t chunk_size);
 int dm_tree_node_add_snapshot_merge_target(struct dm_tree_node *node,
 					     uint64_t size,