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ext4: refine extent status tree

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This commit refines the extent status tree code.

1) A prefix 'es_' is added to to the extent status tree structure
members.

2) Refactored es_remove_extent() so that __es_remove_extent() can be
used by es_insert_extent() to remove the old extent entry(-ies) before
inserting a new one.

3) Rename extent_status_end() to ext4_es_end()

4) ext4_es_can_be_merged() is define to check whether two extents can
be merged or not.

5) Update and clarified comments.

Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Zheng Liu
2013-02-18 00:26:51 -05:00
committed by Theodore Ts'o
parent 0f70b40613
commit 06b0c88621
5 changed files with 221 additions and 182 deletions
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fs/ext4/extents_status.h
+4 -4
View File
@@ -22,8 +22,8 @@
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 */
ext4_lblk_t es_lblk; /* first logical block extent covers */
ext4_lblk_t es_len; /* length of extent in block */
};
struct ext4_es_tree {
@@ -35,9 +35,9 @@ 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,
extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
ext4_lblk_t len);
extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t start,
extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
ext4_lblk_t len);
extern ext4_lblk_t ext4_es_find_extent(struct inode *inode,
struct extent_status *es);