This patch adds two structures that supports delayed extent tree.
Signed-off-by: Yongqiang Yang <xiaoqiangnk@xxxxxxxxx>
---
fs/ext4/delayed_extents.h | 22 ++++++++++++++++++++++
1 files changed, 22 insertions(+), 0 deletions(-)
create mode 100644 fs/ext4/delayed_extents.h
diff --git a/fs/ext4/delayed_extents.h b/fs/ext4/delayed_extents.h
new file mode 100644
index 0000000..66d6390
--- /dev/null
+++ b/fs/ext4/delayed_extents.h
@@ -0,0 +1,22 @@
+/*
+ * fs/ext4/delayed_extents.h
+ *
+ * Written by Yongqiang Yang <xiaoqiangnk@xxxxxxxxx>
+ *
+ */
+
+#ifndef _EXT4_DELAYED_EXTENTS_H
+#define _EXT4_DELAYED_EXTENTS_H
+
+struct delayed_extent {
+ struct rb_node rb_node;
+ ext4_lblk_t start; /* first block extent covers */
+ ext4_lblk_t len; /* length of extent ib block */
+};
+
+struct ext4_de_tree {
+ struct rb_root root;
+ struct delayed_extent *cache_de; /* recently accessed extent */
+};
+
+#endif /* _EXT4_DELAYED_EXTENTS_H */
--
1.7.5.1
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