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[RFC,V2,1/6] ext4: add two structures supporting delayed extent tree

Message ID 1317272926-13303-2-git-send-email-xiaoqiangnk@gmail.com
State Superseded, archived
Headers show

Commit Message

Yongqiang Yang Sept. 29, 2011, 5:08 a.m. UTC 
This patch adds two structures that supports delayed extent tree.

Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com>
---
 fs/ext4/delayed_extents.h |   22 ++++++++++++++++++++++
 1 files changed, 22 insertions(+), 0 deletions(-)
 create mode 100644 fs/ext4/delayed_extents.h
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Patch

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@gmail.com>
+ *
+ */
+
+#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 */