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authorZheng Liu <wenqing.lz@taobao.com>2012-11-08 15:18:54 -0500
committerTheodore Ts'o <tytso@mit.edu>2012-11-08 15:18:54 -0500
commitc0677e6d0f9d991adff972b8d06cb83de1f8ee8e (patch)
treef320c2fb163763f200d0126c90fcbd909bfbedf2 /fs/ext4/extents_status.h
parent07aa2ea13814ea60d12f7330b6d5ccfdb0c3ba4d (diff)
downloadop-kernel-dev-c0677e6d0f9d991adff972b8d06cb83de1f8ee8e.zip
op-kernel-dev-c0677e6d0f9d991adff972b8d06cb83de1f8ee8e.tar.gz
ext4: add data structures for the extent status tree
This patch adds two structures that supports extent status tree, extent_status and ext4_es_tree. Currently extent_status is used to track a delay extent for an inode, which record the start block and the length of the delay extent. ext4_es_tree is used to store all extent_status for an inode in memory. Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com> Signed-off-by: Allison Henderson <achender@linux.vnet.ibm.com> Signed-off-by: Zheng Liu <wenqing.lz@taobao.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/extents_status.h')
-rw-r--r--fs/ext4/extents_status.h25
1 files changed, 25 insertions, 0 deletions
diff --git a/fs/ext4/extents_status.h b/fs/ext4/extents_status.h
new file mode 100644
index 0000000..8be2ab9
--- /dev/null
+++ b/fs/ext4/extents_status.h
@@ -0,0 +1,25 @@
+/*
+ * fs/ext4/extents_status.h
+ *
+ * Written by Yongqiang Yang <xiaoqiangnk@gmail.com>
+ * Modified by
+ * Allison Henderson <achender@linux.vnet.ibm.com>
+ * Zheng Liu <wenqing.lz@taobao.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 */
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