mount: delete target entry first during move

weed/mount/inode_to_path.go

@@ -157,6 +157,10 @@ func (i *InodeToPath) MovePath(sourcePath, targetPath util.FullPath) (replacedIn
 	defer i.Unlock()
 	sourceInode, sourceFound := i.path2inode[sourcePath]
 	targetInode, targetFound := i.path2inode[targetPath]
+	if targetFound {
+		delete(i.inode2path, targetInode)
+		delete(i.path2inode, targetPath)
+	}
 	if sourceFound {
 		delete(i.path2inode, sourcePath)
 		i.path2inode[targetPath] = sourceInode
@@ -165,11 +169,14 @@ func (i *InodeToPath) MovePath(sourcePath, targetPath util.FullPath) (replacedIn
 		// so no need to worry about their source inodes
 		return
 	}
-	i.inode2path[sourceInode].FullPath = targetPath
-	if targetFound {
-		delete(i.inode2path, targetInode)
+	if entry, entryFound := i.inode2path[sourceInode]; entryFound {
+		entry.FullPath = targetPath
+		entry.isChildrenCached = false
+		if !targetFound {
+			entry.nlookup++
+		}
 	} else {
-		i.inode2path[sourceInode].nlookup++
+		glog.Errorf("MovePath %s to %s: sourceInode %s not found", sourcePath, targetPath, sourceInode)
 	}
 	return targetInode
 }