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
52 struct ext4_sb_info;
53 struct ext4_extent;
54
55 struct 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
62 struct ext4_es_tree {
63 struct rb_root root;
64 struct extent_status *cache_es; /* recently accessed extent */
65 };
66
67 struct ext4_es_stats {
68 unsigned long es_stats_last_sorted;
69 unsigned long es_stats_shrunk;
70 unsigned long es_stats_cache_hits;
71 unsigned long es_stats_cache_misses;
72 u64 es_stats_scan_time;
73 u64 es_stats_max_scan_time;
74 struct percpu_counter es_stats_all_cnt;
75 struct percpu_counter es_stats_lru_cnt;
76 };
77
78 extern int __init ext4_init_es(void);
79 extern void ext4_exit_es(void);
80 extern void ext4_es_init_tree(struct ext4_es_tree *tree);
81
82 extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
83 ext4_lblk_t len, ext4_fsblk_t pblk,
84 unsigned int status);
85 extern void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk,
86 ext4_lblk_t len, ext4_fsblk_t pblk,
87 unsigned int status);
88 extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
89 ext4_lblk_t len);
90 extern void ext4_es_find_delayed_extent_range(struct inode *inode,
91 ext4_lblk_t lblk, ext4_lblk_t end,
92 struct extent_status *es);
93 extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk,
94 struct extent_status *es);
95
ext4_es_is_written(struct extent_status * es)96 static inline int ext4_es_is_written(struct extent_status *es)
97 {
98 return (es->es_pblk & ES_WRITTEN) != 0;
99 }
100
ext4_es_is_unwritten(struct extent_status * es)101 static inline int ext4_es_is_unwritten(struct extent_status *es)
102 {
103 return (es->es_pblk & ES_UNWRITTEN) != 0;
104 }
105
ext4_es_is_delayed(struct extent_status * es)106 static inline int ext4_es_is_delayed(struct extent_status *es)
107 {
108 return (es->es_pblk & ES_DELAYED) != 0;
109 }
110
ext4_es_is_hole(struct extent_status * es)111 static inline int ext4_es_is_hole(struct extent_status *es)
112 {
113 return (es->es_pblk & ES_HOLE) != 0;
114 }
115
ext4_es_status(struct extent_status * es)116 static inline unsigned int ext4_es_status(struct extent_status *es)
117 {
118 return es->es_pblk >> ES_SHIFT;
119 }
120
ext4_es_pblock(struct extent_status * es)121 static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es)
122 {
123 return es->es_pblk & ~ES_MASK;
124 }
125
ext4_es_store_pblock(struct extent_status * es,ext4_fsblk_t pb)126 static inline void ext4_es_store_pblock(struct extent_status *es,
127 ext4_fsblk_t pb)
128 {
129 ext4_fsblk_t block;
130
131 block = (pb & ~ES_MASK) | (es->es_pblk & ES_MASK);
132 es->es_pblk = block;
133 }
134
ext4_es_store_status(struct extent_status * es,unsigned int status)135 static inline void ext4_es_store_status(struct extent_status *es,
136 unsigned int status)
137 {
138 es->es_pblk = (((ext4_fsblk_t)
139 (status & EXTENT_STATUS_FLAGS) << ES_SHIFT) |
140 (es->es_pblk & ~ES_MASK));
141 }
142
ext4_es_store_pblock_status(struct extent_status * es,ext4_fsblk_t pb,unsigned int status)143 static inline void ext4_es_store_pblock_status(struct extent_status *es,
144 ext4_fsblk_t pb,
145 unsigned int status)
146 {
147 es->es_pblk = (((ext4_fsblk_t)
148 (status & EXTENT_STATUS_FLAGS) << ES_SHIFT) |
149 (pb & ~ES_MASK));
150 }
151
152 extern int ext4_es_register_shrinker(struct ext4_sb_info *sbi);
153 extern void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi);
154 extern void ext4_es_lru_add(struct inode *inode);
155 extern void ext4_es_lru_del(struct inode *inode);
156
157 #endif /* _EXT4_EXTENTS_STATUS_H */
158