linux-ext4 - [RFC][PATCH 1/10 v1] ext4: add two structures supporting extent status tree

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Message-Id: <1342943167-12153-2-git-send-email-wenqing.lz@taobao.com>
Date:	Sun, 22 Jul 2012 15:45:58 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org
Cc:	xiaoqiangnk@...il.com, achender@...ux.vnet.ibm.com,
	wenqing.lz@...bao.com
Subject: [RFC][PATCH 1/10 v1] ext4: add two structures supporting extent status tree

From: Zheng Liu <wenqing.lz@...bao.com>

This patch adds two structures that supports status extent tree and
status_extent_info to inode_info.

Signed-off-by: Yongqiang Yang <xiaoqiangnk@...il.com>
Signed-off-by: Allison Henderson <achender@...ux.vnet.ibm.com>
Signed-off-by: Zheng Liu <wenqing.lz@...bao.com>
---
 fs/ext4/ext4.h           |    5 +++++
 fs/ext4/extents_status.h |   22 ++++++++++++++++++++++
 2 files changed, 27 insertions(+), 0 deletions(-)
 create mode 100644 fs/ext4/extents_status.h

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index cfc4e01..c0fe23e 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -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;
 
diff --git a/fs/ext4/extents_status.h b/fs/ext4/extents_status.h
new file mode 100644
index 0000000..d87fd71
--- /dev/null
+++ b/fs/ext4/extents_status.h
@@ -0,0 +1,22 @@
+/*
+ *  fs/ext4/extents_status.h
+ *
+ * Written by Yongqiang Yang <xiaoqiangnk@...il.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 */
-- 
1.7.4.1

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