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authorZheng Liu <wenqing.lz@taobao.com>2012-11-08 21:57:20 -0500
committerTheodore Ts'o <tytso@mit.edu>2012-11-08 21:57:20 -0500
commit654598bef3731c9ae9b068ac35e6b69674c02841 (patch)
tree24e0f7c13aca6426b8982da2768c6a1787a2d6be /fs/ext4/extents_status.h
parentc0677e6d0f9d991adff972b8d06cb83de1f8ee8e (diff)
ext4: add operations on extent status tree
This patch adds operations on a extent status tree. CC: Lukas Czerner <lczerner@redhat.com> Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com> Signed-off-by: Allison Henderson <achender@linux.vnet.ibm.com> Signed-off-by: Hugh Dickins <hughd@google.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.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/fs/ext4/extents_status.h b/fs/ext4/extents_status.h
index 8be2ab9c9425..077f82db092a 100644
--- a/fs/ext4/extents_status.h
+++ b/fs/ext4/extents_status.h
@@ -11,6 +11,15 @@
#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 */
@@ -22,4 +31,15 @@ struct ext4_es_tree {
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 */