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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 | ||
fdc0212e ZL |
23 | #define EXTENT_STATUS_WRITTEN 0x80000000 /* written extent */ |
24 | #define EXTENT_STATUS_UNWRITTEN 0x40000000 /* unwritten extent */ | |
25 | #define EXTENT_STATUS_DELAYED 0x20000000 /* delayed extent */ | |
26 | #define EXTENT_STATUS_HOLE 0x10000000 /* hole */ | |
27 | ||
28 | #define EXTENT_STATUS_FLAGS (EXTENT_STATUS_WRITTEN | \ | |
29 | EXTENT_STATUS_UNWRITTEN | \ | |
30 | EXTENT_STATUS_DELAYED | \ | |
31 | EXTENT_STATUS_HOLE) | |
32 | ||
c0677e6d ZL |
33 | struct extent_status { |
34 | struct rb_node rb_node; | |
06b0c886 ZL |
35 | ext4_lblk_t es_lblk; /* first logical block extent covers */ |
36 | ext4_lblk_t es_len; /* length of extent in block */ | |
fdc0212e | 37 | ext4_fsblk_t es_pblk; /* first physical block */ |
c0677e6d ZL |
38 | }; |
39 | ||
40 | struct ext4_es_tree { | |
41 | struct rb_root root; | |
42 | struct extent_status *cache_es; /* recently accessed extent */ | |
43 | }; | |
44 | ||
654598be ZL |
45 | extern int __init ext4_init_es(void); |
46 | extern void ext4_exit_es(void); | |
47 | extern void ext4_es_init_tree(struct ext4_es_tree *tree); | |
48 | ||
06b0c886 | 49 | extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk, |
fdc0212e ZL |
50 | ext4_lblk_t len, ext4_fsblk_t pblk, |
51 | unsigned long long status); | |
06b0c886 | 52 | extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk, |
654598be ZL |
53 | ext4_lblk_t len); |
54 | extern ext4_lblk_t ext4_es_find_extent(struct inode *inode, | |
55 | struct extent_status *es); | |
56 | ||
fdc0212e ZL |
57 | static inline int ext4_es_is_written(struct extent_status *es) |
58 | { | |
59 | return (es->es_pblk & EXTENT_STATUS_WRITTEN); | |
60 | } | |
61 | ||
62 | static inline int ext4_es_is_unwritten(struct extent_status *es) | |
63 | { | |
64 | return (es->es_pblk & EXTENT_STATUS_UNWRITTEN); | |
65 | } | |
66 | ||
67 | static inline int ext4_es_is_delayed(struct extent_status *es) | |
68 | { | |
69 | return (es->es_pblk & EXTENT_STATUS_DELAYED); | |
70 | } | |
71 | ||
72 | static inline int ext4_es_is_hole(struct extent_status *es) | |
73 | { | |
74 | return (es->es_pblk & EXTENT_STATUS_HOLE); | |
75 | } | |
76 | ||
77 | static inline ext4_fsblk_t ext4_es_status(struct extent_status *es) | |
78 | { | |
79 | return (es->es_pblk & EXTENT_STATUS_FLAGS); | |
80 | } | |
81 | ||
82 | static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es) | |
83 | { | |
84 | return (es->es_pblk & ~EXTENT_STATUS_FLAGS); | |
85 | } | |
86 | ||
87 | static inline void ext4_es_store_pblock(struct extent_status *es, | |
88 | ext4_fsblk_t pb) | |
89 | { | |
90 | ext4_fsblk_t block; | |
91 | ||
92 | block = (pb & ~EXTENT_STATUS_FLAGS) | | |
93 | (es->es_pblk & EXTENT_STATUS_FLAGS); | |
94 | es->es_pblk = block; | |
95 | } | |
96 | ||
97 | static inline void ext4_es_store_status(struct extent_status *es, | |
98 | unsigned long long status) | |
99 | { | |
100 | ext4_fsblk_t block; | |
101 | ||
102 | block = (status & EXTENT_STATUS_FLAGS) | | |
103 | (es->es_pblk & ~EXTENT_STATUS_FLAGS); | |
104 | es->es_pblk = block; | |
105 | } | |
106 | ||
c0677e6d | 107 | #endif /* _EXT4_EXTENTS_STATUS_H */ |