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ext4: add operations on extent status tree

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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>
This commit is contained in:
Zheng Liu
2012-11-08 21:57:20 -05:00
committed by Theodore Ts'o
parent c0677e6d0f
commit 654598bef3
3 changed files with 513 additions and 1 deletions
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20
fs/ext4/extents_status.h
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@@ -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 */