2 * fs/ext4/extents_status.h
4 * Written by Yongqiang Yang <xiaoqiangnk@gmail.com>
6 * Allison Henderson <achender@linux.vnet.ibm.com>
7 * Zheng Liu <wenqing.lz@taobao.com>
11 #ifndef _EXT4_EXTENTS_STATUS_H
12 #define _EXT4_EXTENTS_STATUS_H
15 * Turn on ES_DEBUG__ to get lots of info about extent status operations.
18 #define es_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
20 #define es_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
24 * With ES_AGGRESSIVE_TEST defined, the result of es caching will be
25 * checked with old map_block's result.
27 #define ES_AGGRESSIVE_TEST__
30 * These flags live in the high bits of extent_status.es_pblk
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)
39 #define EXTENT_STATUS_FLAGS (EXTENT_STATUS_WRITTEN | \
40 EXTENT_STATUS_UNWRITTEN | \
41 EXTENT_STATUS_DELAYED | \
44 #define ES_WRITTEN (1ULL << 63)
45 #define ES_UNWRITTEN (1ULL << 62)
46 #define ES_DELAYED (1ULL << 61)
47 #define ES_HOLE (1ULL << 60)
49 #define ES_MASK (ES_WRITTEN | ES_UNWRITTEN | \
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 */
64 struct extent_status *cache_es; /* recently accessed extent */
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;
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);
82 extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
83 ext4_lblk_t len, ext4_fsblk_t pblk,
85 extern void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk,
86 ext4_lblk_t len, ext4_fsblk_t pblk,
88 extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
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);
96 static inline int ext4_es_is_written(struct extent_status *es)
98 return (es->es_pblk & ES_WRITTEN) != 0;
101 static inline int ext4_es_is_unwritten(struct extent_status *es)
103 return (es->es_pblk & ES_UNWRITTEN) != 0;
106 static inline int ext4_es_is_delayed(struct extent_status *es)
108 return (es->es_pblk & ES_DELAYED) != 0;
111 static inline int ext4_es_is_hole(struct extent_status *es)
113 return (es->es_pblk & ES_HOLE) != 0;
116 static inline unsigned int ext4_es_status(struct extent_status *es)
118 return es->es_pblk >> ES_SHIFT;
121 static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es)
123 return es->es_pblk & ~ES_MASK;
126 static inline void ext4_es_store_pblock(struct extent_status *es,
131 block = (pb & ~ES_MASK) | (es->es_pblk & ES_MASK);
135 static inline void ext4_es_store_status(struct extent_status *es,
138 es->es_pblk = (((ext4_fsblk_t)
139 (status & EXTENT_STATUS_FLAGS) << ES_SHIFT) |
140 (es->es_pblk & ~ES_MASK));
143 static inline void ext4_es_store_pblock_status(struct extent_status *es,
147 es->es_pblk = (((ext4_fsblk_t)
148 (status & EXTENT_STATUS_FLAGS) << ES_SHIFT) |
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);
157 #endif /* _EXT4_EXTENTS_STATUS_H */