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 enum {
33 ES_WRITTEN_B,
34 ES_UNWRITTEN_B,
35 ES_DELAYED_B,
36 ES_HOLE_B,
37 ES_REFERENCED_B,
38 ES_FLAGS
39 };
40
41 #define ES_SHIFT (sizeof(ext4_fsblk_t)*8 - ES_FLAGS)
42 #define ES_MASK (~((ext4_fsblk_t)0) << ES_SHIFT)
43
44 #define EXTENT_STATUS_WRITTEN (1 << ES_WRITTEN_B)
45 #define EXTENT_STATUS_UNWRITTEN (1 << ES_UNWRITTEN_B)
46 #define EXTENT_STATUS_DELAYED (1 << ES_DELAYED_B)
47 #define EXTENT_STATUS_HOLE (1 << ES_HOLE_B)
48 #define EXTENT_STATUS_REFERENCED (1 << ES_REFERENCED_B)
49
50 #define ES_TYPE_MASK ((ext4_fsblk_t)(EXTENT_STATUS_WRITTEN | \
51 EXTENT_STATUS_UNWRITTEN | \
52 EXTENT_STATUS_DELAYED | \
53 EXTENT_STATUS_HOLE) << ES_SHIFT)
54
55 struct ext4_sb_info;
56 struct ext4_extent;
57
58 struct extent_status {
59 struct rb_node rb_node;
60 ext4_lblk_t es_lblk; /* first logical block extent covers */
61 ext4_lblk_t es_len; /* length of extent in block */
62 ext4_fsblk_t es_pblk; /* first physical block */
63 };
64
65 struct ext4_es_tree {
66 struct rb_root root;
67 struct extent_status *cache_es; /* recently accessed extent */
68 };
69
70 struct ext4_es_stats {
71 unsigned long es_stats_shrunk;
72 unsigned long es_stats_cache_hits;
73 unsigned long es_stats_cache_misses;
74 u64 es_stats_scan_time;
75 u64 es_stats_max_scan_time;
76 struct percpu_counter es_stats_all_cnt;
77 struct percpu_counter es_stats_shk_cnt;
78 };
79
80 extern int __init ext4_init_es(void);
81 extern void ext4_exit_es(void);
82 extern void ext4_es_init_tree(struct ext4_es_tree *tree);
83
84 extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
85 ext4_lblk_t len, ext4_fsblk_t pblk,
86 unsigned int status);
87 extern void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk,
88 ext4_lblk_t len, ext4_fsblk_t pblk,
89 unsigned int status);
90 extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
91 ext4_lblk_t len);
92 extern void ext4_es_find_delayed_extent_range(struct inode *inode,
93 ext4_lblk_t lblk, ext4_lblk_t end,
94 struct extent_status *es);
95 extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk,
96 struct extent_status *es);
97
ext4_es_status(struct extent_status * es)98 static inline unsigned int ext4_es_status(struct extent_status *es)
99 {
100 return es->es_pblk >> ES_SHIFT;
101 }
102
ext4_es_type(struct extent_status * es)103 static inline unsigned int ext4_es_type(struct extent_status *es)
104 {
105 return (es->es_pblk & ES_TYPE_MASK) >> ES_SHIFT;
106 }
107
ext4_es_is_written(struct extent_status * es)108 static inline int ext4_es_is_written(struct extent_status *es)
109 {
110 return (ext4_es_type(es) & EXTENT_STATUS_WRITTEN) != 0;
111 }
112
ext4_es_is_unwritten(struct extent_status * es)113 static inline int ext4_es_is_unwritten(struct extent_status *es)
114 {
115 return (ext4_es_type(es) & EXTENT_STATUS_UNWRITTEN) != 0;
116 }
117
ext4_es_is_delayed(struct extent_status * es)118 static inline int ext4_es_is_delayed(struct extent_status *es)
119 {
120 return (ext4_es_type(es) & EXTENT_STATUS_DELAYED) != 0;
121 }
122
ext4_es_is_hole(struct extent_status * es)123 static inline int ext4_es_is_hole(struct extent_status *es)
124 {
125 return (ext4_es_type(es) & EXTENT_STATUS_HOLE) != 0;
126 }
127
ext4_es_set_referenced(struct extent_status * es)128 static inline void ext4_es_set_referenced(struct extent_status *es)
129 {
130 es->es_pblk |= ((ext4_fsblk_t)EXTENT_STATUS_REFERENCED) << ES_SHIFT;
131 }
132
ext4_es_clear_referenced(struct extent_status * es)133 static inline void ext4_es_clear_referenced(struct extent_status *es)
134 {
135 es->es_pblk &= ~(((ext4_fsblk_t)EXTENT_STATUS_REFERENCED) << ES_SHIFT);
136 }
137
ext4_es_is_referenced(struct extent_status * es)138 static inline int ext4_es_is_referenced(struct extent_status *es)
139 {
140 return (ext4_es_status(es) & EXTENT_STATUS_REFERENCED) != 0;
141 }
142
ext4_es_pblock(struct extent_status * es)143 static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es)
144 {
145 return es->es_pblk & ~ES_MASK;
146 }
147
ext4_es_store_pblock(struct extent_status * es,ext4_fsblk_t pb)148 static inline void ext4_es_store_pblock(struct extent_status *es,
149 ext4_fsblk_t pb)
150 {
151 ext4_fsblk_t block;
152
153 block = (pb & ~ES_MASK) | (es->es_pblk & ES_MASK);
154 es->es_pblk = block;
155 }
156
ext4_es_store_status(struct extent_status * es,unsigned int status)157 static inline void ext4_es_store_status(struct extent_status *es,
158 unsigned int status)
159 {
160 es->es_pblk = (((ext4_fsblk_t)status << ES_SHIFT) & ES_MASK) |
161 (es->es_pblk & ~ES_MASK);
162 }
163
ext4_es_store_pblock_status(struct extent_status * es,ext4_fsblk_t pb,unsigned int status)164 static inline void ext4_es_store_pblock_status(struct extent_status *es,
165 ext4_fsblk_t pb,
166 unsigned int status)
167 {
168 es->es_pblk = (((ext4_fsblk_t)status << ES_SHIFT) & ES_MASK) |
169 (pb & ~ES_MASK);
170 }
171
172 extern int ext4_es_register_shrinker(struct ext4_sb_info *sbi);
173 extern void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi);
174
175 extern int ext4_seq_es_shrinker_info_show(struct seq_file *seq, void *v);
176
177 #endif /* _EXT4_EXTENTS_STATUS_H */
178