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-rw-r--r--fs/ext4/extents_status.h45
1 files changed, 45 insertions, 0 deletions
diff --git a/fs/ext4/extents_status.h b/fs/ext4/extents_status.h
new file mode 100644
index 00000000000..077f82db092
--- /dev/null
+++ b/fs/ext4/extents_status.h
@@ -0,0 +1,45 @@
+/*
+ * 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
+
+/*
+ * Turn on ES_DEBUG__ to get lots of info about extent status operations.
+ */
+#ifdef ES_DEBUG__
+#define es_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
+#else
+#define es_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
+#endif
+
+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 */
+};
+
+extern int __init ext4_init_es(void);
+extern void ext4_exit_es(void);
+extern void ext4_es_init_tree(struct ext4_es_tree *tree);
+
+extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t start,
+ ext4_lblk_t len);
+extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t start,
+ ext4_lblk_t len);
+extern ext4_lblk_t ext4_es_find_extent(struct inode *inode,
+ struct extent_status *es);
+
+#endif /* _EXT4_EXTENTS_STATUS_H */