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c0677e6d ZL |
1 | /* |
2 | * fs/ext4/extents_status.h | |
3 | * | |
4 | * Written by Yongqiang Yang <xiaoqiangnk@gmail.com> | |
5 | * Modified by | |
6 | * Allison Henderson <achender@linux.vnet.ibm.com> | |
7 | * Zheng Liu <wenqing.lz@taobao.com> | |
8 | * | |
9 | */ | |
10 | ||
11 | #ifndef _EXT4_EXTENTS_STATUS_H | |
12 | #define _EXT4_EXTENTS_STATUS_H | |
13 | ||
654598be ZL |
14 | /* |
15 | * Turn on ES_DEBUG__ to get lots of info about extent status operations. | |
16 | */ | |
17 | #ifdef ES_DEBUG__ | |
18 | #define es_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) | |
19 | #else | |
20 | #define es_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) | |
21 | #endif | |
22 | ||
c0677e6d ZL |
23 | struct extent_status { |
24 | struct rb_node rb_node; | |
25 | ext4_lblk_t start; /* first block extent covers */ | |
26 | ext4_lblk_t len; /* length of extent in block */ | |
27 | }; | |
28 | ||
29 | struct ext4_es_tree { | |
30 | struct rb_root root; | |
31 | struct extent_status *cache_es; /* recently accessed extent */ | |
32 | }; | |
33 | ||
654598be ZL |
34 | extern int __init ext4_init_es(void); |
35 | extern void ext4_exit_es(void); | |
36 | extern void ext4_es_init_tree(struct ext4_es_tree *tree); | |
37 | ||
38 | extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t start, | |
39 | ext4_lblk_t len); | |
40 | extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t start, | |
41 | ext4_lblk_t len); | |
42 | extern ext4_lblk_t ext4_es_find_extent(struct inode *inode, | |
43 | struct extent_status *es); | |
44 | ||
c0677e6d | 45 | #endif /* _EXT4_EXTENTS_STATUS_H */ |