mirror of
https://github.com/torvalds/linux.git
synced 2024-11-16 09:02:00 +00:00
654598bef3
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>
46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
/*
|
|
* 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 */
|