@@ -810,6 +810,8 @@ struct ext4_ext_cache {
__u32 ec_len; /* must be 32bit to return holes */
};
+#include "extents_status.h"
+
/*
* fourth extended file system inode data in memory
*/
@@ -887,6 +889,9 @@ struct ext4_inode_info {
struct list_head i_prealloc_list;
spinlock_t i_prealloc_lock;
+ /* extents status tree */
+ struct ext4_es_tree i_es_tree;
+
/* ialloc */
ext4_group_t i_last_alloc_group;
new file mode 100644
@@ -0,0 +1,22 @@
+/*
+ * fs/ext4/extents_status.h
+ *
+ * Written by Yongqiang Yang <xiaoqiangnk@gmail.com>
+ *
+ */
+
+#ifndef _EXT4_EXTENTS_STATUS_H
+#define _EXT4_EXTENTS_STATUS_H
+
+struct extent_status {
+ struct rb_node rb_node;
+ ext4_lblk_t start; /* first block extent covers */
+ ext4_lblk_t len; /* length of extent in block */
+};
+
+struct ext4_es_tree {
+ struct rb_root root;
+ struct extent_status *cache_es; /* recently accessed extent */
+};
+
+#endif /* _EXT4_EXTENTS_STATUS_H */