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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 | ||
8e919d13 TT |
23 | /* |
24 | * These flags live in the high bits of extent_status.es_pblk | |
25 | */ | |
26 | #define EXTENT_STATUS_WRITTEN (1ULL << 63) | |
27 | #define EXTENT_STATUS_UNWRITTEN (1ULL << 62) | |
28 | #define EXTENT_STATUS_DELAYED (1ULL << 61) | |
29 | #define EXTENT_STATUS_HOLE (1ULL << 60) | |
fdc0212e ZL |
30 | |
31 | #define EXTENT_STATUS_FLAGS (EXTENT_STATUS_WRITTEN | \ | |
32 | EXTENT_STATUS_UNWRITTEN | \ | |
33 | EXTENT_STATUS_DELAYED | \ | |
34 | EXTENT_STATUS_HOLE) | |
35 | ||
c0677e6d ZL |
36 | struct extent_status { |
37 | struct rb_node rb_node; | |
06b0c886 ZL |
38 | ext4_lblk_t es_lblk; /* first logical block extent covers */ |
39 | ext4_lblk_t es_len; /* length of extent in block */ | |
fdc0212e | 40 | ext4_fsblk_t es_pblk; /* first physical block */ |
c0677e6d ZL |
41 | }; |
42 | ||
43 | struct ext4_es_tree { | |
44 | struct rb_root root; | |
45 | struct extent_status *cache_es; /* recently accessed extent */ | |
46 | }; | |
47 | ||
654598be ZL |
48 | extern int __init ext4_init_es(void); |
49 | extern void ext4_exit_es(void); | |
50 | extern void ext4_es_init_tree(struct ext4_es_tree *tree); | |
51 | ||
06b0c886 | 52 | extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk, |
fdc0212e ZL |
53 | ext4_lblk_t len, ext4_fsblk_t pblk, |
54 | unsigned long long status); | |
06b0c886 | 55 | extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk, |
654598be | 56 | ext4_lblk_t len); |
be401363 ZL |
57 | extern void ext4_es_find_delayed_extent(struct inode *inode, ext4_lblk_t lblk, |
58 | struct extent_status *es); | |
d100eef2 ZL |
59 | extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk, |
60 | struct extent_status *es); | |
654598be | 61 | |
fdc0212e ZL |
62 | static inline int ext4_es_is_written(struct extent_status *es) |
63 | { | |
8e919d13 | 64 | return (es->es_pblk & EXTENT_STATUS_WRITTEN) != 0; |
fdc0212e ZL |
65 | } |
66 | ||
67 | static inline int ext4_es_is_unwritten(struct extent_status *es) | |
68 | { | |
8e919d13 | 69 | return (es->es_pblk & EXTENT_STATUS_UNWRITTEN) != 0; |
fdc0212e ZL |
70 | } |
71 | ||
72 | static inline int ext4_es_is_delayed(struct extent_status *es) | |
73 | { | |
8e919d13 | 74 | return (es->es_pblk & EXTENT_STATUS_DELAYED) != 0; |
fdc0212e ZL |
75 | } |
76 | ||
77 | static inline int ext4_es_is_hole(struct extent_status *es) | |
78 | { | |
8e919d13 | 79 | return (es->es_pblk & EXTENT_STATUS_HOLE) != 0; |
fdc0212e ZL |
80 | } |
81 | ||
82 | static inline ext4_fsblk_t ext4_es_status(struct extent_status *es) | |
83 | { | |
84 | return (es->es_pblk & EXTENT_STATUS_FLAGS); | |
85 | } | |
86 | ||
87 | static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es) | |
88 | { | |
89 | return (es->es_pblk & ~EXTENT_STATUS_FLAGS); | |
90 | } | |
91 | ||
92 | static inline void ext4_es_store_pblock(struct extent_status *es, | |
93 | ext4_fsblk_t pb) | |
94 | { | |
95 | ext4_fsblk_t block; | |
96 | ||
97 | block = (pb & ~EXTENT_STATUS_FLAGS) | | |
98 | (es->es_pblk & EXTENT_STATUS_FLAGS); | |
99 | es->es_pblk = block; | |
100 | } | |
101 | ||
102 | static inline void ext4_es_store_status(struct extent_status *es, | |
103 | unsigned long long status) | |
104 | { | |
105 | ext4_fsblk_t block; | |
106 | ||
107 | block = (status & EXTENT_STATUS_FLAGS) | | |
108 | (es->es_pblk & ~EXTENT_STATUS_FLAGS); | |
109 | es->es_pblk = block; | |
110 | } | |
111 | ||
74cd15cd ZL |
112 | extern void ext4_es_register_shrinker(struct super_block *sb); |
113 | extern void ext4_es_unregister_shrinker(struct super_block *sb); | |
114 | extern void ext4_es_lru_add(struct inode *inode); | |
115 | extern void ext4_es_lru_del(struct inode *inode); | |
116 | ||
c0677e6d | 117 | #endif /* _EXT4_EXTENTS_STATUS_H */ |