From 2e95949b807927cdbee071e62715906bcc2c24ef Mon Sep 17 00:00:00 2001
From: Alasdair Kergon <agk@redhat.com>
Date: Wed, 26 Oct 2005 15:21:13 +0000
Subject: [PATCH] attempt to cope with uuid transition

---
 libdm/libdm-deptree.c | 30 +++++++++++++++++++++++++++---
 1 file changed, 27 insertions(+), 3 deletions(-)

diff --git a/libdm/libdm-deptree.c b/libdm/libdm-deptree.c
index 2b05823c8..da1eeafa2 100644
--- a/libdm/libdm-deptree.c
+++ b/libdm/libdm-deptree.c
@@ -362,6 +362,30 @@ int dm_deptree_node_num_children(struct deptree_node *node, uint32_t inverted)
 	return list_size(&node->uses);
 }
 
+/*
+ * Returns 1 if no prefix supplied
+ */
+static int _uuid_prefix_matches(const char *uuid, const char *uuid_prefix, size_t uuid_prefix_len)
+{
+	if (!uuid_prefix)
+		return 1;
+
+	if (!strncmp(uuid, uuid_prefix, uuid_prefix_len))
+		return 1;
+
+	/* Handle transition: active device uuids might be missing the prefix */
+	if (uuid_prefix_len <= 4)
+		return 0;
+
+	if (!strcmp(uuid, "LVM-") || strcmp(uuid_prefix, "LVM-"))
+		return 0;
+
+	if (!strncmp(uuid, uuid_prefix + 4, uuid_prefix_len - 4))
+		return 1;
+
+	return 0;
+}
+
 /*
  * Returns 1 if no children.
  */
@@ -392,7 +416,7 @@ static int _children_suspended(struct deptree_node *node,
 		}
 
 		/* Ignore if it doesn't belong to this VG */
-		if (uuid_prefix && strncmp(uuid, uuid_prefix, uuid_prefix_len))
+		if (!_uuid_prefix_matches(uuid, uuid_prefix, uuid_prefix_len))
 			continue;
 
 		if (!(dinfo = dm_deptree_node_get_info(dlink->node))) {
@@ -563,7 +587,7 @@ int dm_deptree_deactivate_children(struct deptree_node *dnode,
 		}
 
 		/* Ignore if it doesn't belong to this VG */
-		if (uuid_prefix && strncmp(uuid, uuid_prefix, uuid_prefix_len))
+		if (!_uuid_prefix_matches(uuid, uuid_prefix, uuid_prefix_len))
 			continue;
 
 		/* Refresh open_count */
@@ -614,7 +638,7 @@ int dm_deptree_suspend_children(struct deptree_node *dnode,
 		}
 
 		/* Ignore if it doesn't belong to this VG */
-		if (uuid_prefix && strncmp(uuid, uuid_prefix, uuid_prefix_len))
+		if (!_uuid_prefix_matches(uuid, uuid_prefix, uuid_prefix_len))
 			continue;
 
 		/* Ensure immediate parents are already suspended */