Store xattr writer block description in a red-black tree

By storing the blocks in a tree, the de-duplication can lookup
existing blocks in logartihmic instead of linear time.

The linked list is still maintained, because we need to iterate
over the blocks in creation order during serialization.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 4 insertions, 1 deletions

diff --git a/lib/sqfs/xattr/xattr_writer.h b/lib/sqfs/xattr/xattr_writer.h
index 826b6f6..8ff9691 100644
--- a/lib/sqfs/xattr/xattr_writer.h
+++ b/lib/sqfs/xattr/xattr_writer.h
@@ -19,6 +19,7 @@
 #include "sqfs/io.h"
 
 #include "str_table.h"
+#include "rbtree.h"
 #include "util.h"
 
 #include <stdlib.h>
@@ -56,7 +57,9 @@ struct sqfs_xattr_writer_t {
 
 	size_t kv_start;
 
-	kv_block_desc_t *kv_blocks;
+	rbtree_t kv_block_tree;
+	kv_block_desc_t *kv_block_first;
+	kv_block_desc_t *kv_block_last;
 	size_t num_blocks;
 };