From 0733161bf46a279f11e20f9ffd34e0136c13a884 Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@lukeshu.com>
Date: Mon, 13 Mar 2023 18:52:51 -0600
Subject: btrfs: io3_btree.go: De-nest populateTreeUUIDs

---
 lib/btrfs/io3_btree.go | 41 +++++++++++++++++++++--------------------
 1 file changed, 21 insertions(+), 20 deletions(-)

(limited to 'lib/btrfs')

diff --git a/lib/btrfs/io3_btree.go b/lib/btrfs/io3_btree.go
index 426e4a1..db4e42c 100644
--- a/lib/btrfs/io3_btree.go
+++ b/lib/btrfs/io3_btree.go
@@ -28,28 +28,29 @@ var _ btrfstree.NodeSource = (*FS)(nil)
 // btrfstree.NodeFile //////////////////////////////////////////////////////////
 
 func (fs *FS) populateTreeUUIDs(ctx context.Context) {
-	if fs.cacheObjID2UUID == nil || fs.cacheUUID2ObjID == nil || fs.cacheTreeParent == nil {
-		fs.cacheObjID2UUID = make(map[btrfsprim.ObjID]btrfsprim.UUID)
-		fs.cacheUUID2ObjID = make(map[btrfsprim.UUID]btrfsprim.ObjID)
-		fs.cacheTreeParent = make(map[btrfsprim.ObjID]btrfsprim.UUID)
-		fs.TreeWalk(ctx, btrfsprim.ROOT_TREE_OBJECTID,
-			func(err *btrfstree.TreeError) {
-				// do nothing
-			},
-			btrfstree.TreeWalkHandler{
-				Item: func(_ btrfstree.TreePath, item btrfstree.Item) error {
-					itemBody, ok := item.Body.(*btrfsitem.Root)
-					if !ok {
-						return nil
-					}
-					fs.cacheObjID2UUID[item.Key.ObjectID] = itemBody.UUID
-					fs.cacheTreeParent[item.Key.ObjectID] = itemBody.ParentUUID
-					fs.cacheUUID2ObjID[itemBody.UUID] = item.Key.ObjectID
+	if fs.cacheObjID2UUID != nil && fs.cacheUUID2ObjID != nil && fs.cacheTreeParent != nil {
+		return
+	}
+	fs.cacheObjID2UUID = make(map[btrfsprim.ObjID]btrfsprim.UUID)
+	fs.cacheUUID2ObjID = make(map[btrfsprim.UUID]btrfsprim.ObjID)
+	fs.cacheTreeParent = make(map[btrfsprim.ObjID]btrfsprim.UUID)
+	fs.TreeWalk(ctx, btrfsprim.ROOT_TREE_OBJECTID,
+		func(err *btrfstree.TreeError) {
+			// do nothing
+		},
+		btrfstree.TreeWalkHandler{
+			Item: func(_ btrfstree.TreePath, item btrfstree.Item) error {
+				itemBody, ok := item.Body.(*btrfsitem.Root)
+				if !ok {
 					return nil
-				},
+				}
+				fs.cacheObjID2UUID[item.Key.ObjectID] = itemBody.UUID
+				fs.cacheTreeParent[item.Key.ObjectID] = itemBody.ParentUUID
+				fs.cacheUUID2ObjID[itemBody.UUID] = item.Key.ObjectID
+				return nil
 			},
-		)
-	}
+		},
+	)
 }
 
 // ParentTree implements btrfstree.NodeFile.
-- 
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