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-rw-r--r--include/linux/nilfs2_fs.h22
1 files changed, 22 insertions, 0 deletions
diff --git a/include/linux/nilfs2_fs.h b/include/linux/nilfs2_fs.h
index ce520402e840..72289d2bb341 100644
--- a/include/linux/nilfs2_fs.h
+++ b/include/linux/nilfs2_fs.h
@@ -403,6 +403,28 @@ struct nilfs_segment_summary {
#define NILFS_SS_GC 0x0010 /* segment written for cleaner operation */
/**
+ * struct nilfs_btree_node - B-tree node
+ * @bn_flags: flags
+ * @bn_level: level
+ * @bn_nchildren: number of children
+ * @bn_pad: padding
+ */
+struct nilfs_btree_node {
+ __u8 bn_flags;
+ __u8 bn_level;
+ __le16 bn_nchildren;
+ __le32 bn_pad;
+};
+
+/* flags */
+#define NILFS_BTREE_NODE_ROOT 0x01
+
+/* level */
+#define NILFS_BTREE_LEVEL_DATA 0
+#define NILFS_BTREE_LEVEL_NODE_MIN (NILFS_BTREE_LEVEL_DATA + 1)
+#define NILFS_BTREE_LEVEL_MAX 14
+
+/**
* struct nilfs_palloc_group_desc - block group descriptor
* @pg_nfrees: number of free entries in block group
*/