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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
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
23/*
24 * With ES_AGGRESSIVE_TEST defined, the result of es caching will be
25 * checked with old map_block's result.
26 */
27#define ES_AGGRESSIVE_TEST__
28
29/*
30 * These flags live in the high bits of extent_status.es_pblk
31 */
32#define ES_SHIFT 60
33
34#define EXTENT_STATUS_WRITTEN (1 << 3)
35#define EXTENT_STATUS_UNWRITTEN (1 << 2)
36#define EXTENT_STATUS_DELAYED (1 << 1)
37#define EXTENT_STATUS_HOLE (1 << 0)
38
39#define EXTENT_STATUS_FLAGS (EXTENT_STATUS_WRITTEN | \
40 EXTENT_STATUS_UNWRITTEN | \
41 EXTENT_STATUS_DELAYED | \
42 EXTENT_STATUS_HOLE)
43
44#define ES_WRITTEN (1ULL << 63)
45#define ES_UNWRITTEN (1ULL << 62)
46#define ES_DELAYED (1ULL << 61)
47#define ES_HOLE (1ULL << 60)
48
49#define ES_MASK (ES_WRITTEN | ES_UNWRITTEN | \
50 ES_DELAYED | ES_HOLE)
51
52struct ext4_sb_info;
53struct ext4_extent;
54
55struct extent_status {
56 struct rb_node rb_node;
57 ext4_lblk_t es_lblk; /* first logical block extent covers */
58 ext4_lblk_t es_len; /* length of extent in block */
59 ext4_fsblk_t es_pblk; /* first physical block */
60};
61
62struct ext4_es_tree {
63 struct rb_root root;
64 struct extent_status *cache_es; /* recently accessed extent */
65};
66
67extern int __init ext4_init_es(void);
68extern void ext4_exit_es(void);
69extern void ext4_es_init_tree(struct ext4_es_tree *tree);
70
71extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
72 ext4_lblk_t len, ext4_fsblk_t pblk,
73 unsigned int status);
74extern void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk,
75 ext4_lblk_t len, ext4_fsblk_t pblk,
76 unsigned int status);
77extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
78 ext4_lblk_t len);
79extern void ext4_es_find_delayed_extent_range(struct inode *inode,
80 ext4_lblk_t lblk, ext4_lblk_t end,
81 struct extent_status *es);
82extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk,
83 struct extent_status *es);
84
85static inline int ext4_es_is_written(struct extent_status *es)
86{
87 return (es->es_pblk & ES_WRITTEN) != 0;
88}
89
90static inline int ext4_es_is_unwritten(struct extent_status *es)
91{
92 return (es->es_pblk & ES_UNWRITTEN) != 0;
93}
94
95static inline int ext4_es_is_delayed(struct extent_status *es)
96{
97 return (es->es_pblk & ES_DELAYED) != 0;
98}
99
100static inline int ext4_es_is_hole(struct extent_status *es)
101{
102 return (es->es_pblk & ES_HOLE) != 0;
103}
104
105static inline unsigned int ext4_es_status(struct extent_status *es)
106{
107 return es->es_pblk >> ES_SHIFT;
108}
109
110static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es)
111{
112 return es->es_pblk & ~ES_MASK;
113}
114
115static inline void ext4_es_store_pblock(struct extent_status *es,
116 ext4_fsblk_t pb)
117{
118 ext4_fsblk_t block;
119
120 block = (pb & ~ES_MASK) | (es->es_pblk & ES_MASK);
121 es->es_pblk = block;
122}
123
124static inline void ext4_es_store_status(struct extent_status *es,
125 unsigned int status)
126{
127 es->es_pblk = (((ext4_fsblk_t)
128 (status & EXTENT_STATUS_FLAGS) << ES_SHIFT) |
129 (es->es_pblk & ~ES_MASK));
130}
131
132extern void ext4_es_register_shrinker(struct ext4_sb_info *sbi);
133extern void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi);
134extern void ext4_es_lru_add(struct inode *inode);
135extern void ext4_es_lru_del(struct inode *inode);
136
137#endif /* _EXT4_EXTENTS_STATUS_H */