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
41 #define ES_SHIFT (sizeof(ext4_fsblk_t)*8 - ES_FLAGS)
42 #define ES_MASK (~((ext4_fsblk_t)0) << ES_SHIFT)
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)
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)
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 */
67 struct extent_status *cache_es; /* recently accessed extent */
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;
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);
84 extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
85 ext4_lblk_t len, ext4_fsblk_t pblk,
87 extern void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk,
88 ext4_lblk_t len, ext4_fsblk_t pblk,
90 extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
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);
98 static inline unsigned int ext4_es_status(struct extent_status *es)
100 return es->es_pblk >> ES_SHIFT;
103 static inline unsigned int ext4_es_type(struct extent_status *es)
105 return (es->es_pblk & ES_TYPE_MASK) >> ES_SHIFT;
108 static inline int ext4_es_is_written(struct extent_status *es)
110 return (ext4_es_type(es) & EXTENT_STATUS_WRITTEN) != 0;
113 static inline int ext4_es_is_unwritten(struct extent_status *es)
115 return (ext4_es_type(es) & EXTENT_STATUS_UNWRITTEN) != 0;
118 static inline int ext4_es_is_delayed(struct extent_status *es)
120 return (ext4_es_type(es) & EXTENT_STATUS_DELAYED) != 0;
123 static inline int ext4_es_is_hole(struct extent_status *es)
125 return (ext4_es_type(es) & EXTENT_STATUS_HOLE) != 0;
128 static inline void ext4_es_set_referenced(struct extent_status *es)
130 es->es_pblk |= ((ext4_fsblk_t)EXTENT_STATUS_REFERENCED) << ES_SHIFT;
133 static inline void ext4_es_clear_referenced(struct extent_status *es)
135 es->es_pblk &= ~(((ext4_fsblk_t)EXTENT_STATUS_REFERENCED) << ES_SHIFT);
138 static inline int ext4_es_is_referenced(struct extent_status *es)
140 return (ext4_es_status(es) & EXTENT_STATUS_REFERENCED) != 0;
143 static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es)
145 return es->es_pblk & ~ES_MASK;
148 static inline void ext4_es_store_pblock(struct extent_status *es,
153 block = (pb & ~ES_MASK) | (es->es_pblk & ES_MASK);
157 static inline void ext4_es_store_status(struct extent_status *es,
160 es->es_pblk = (((ext4_fsblk_t)status << ES_SHIFT) & ES_MASK) |
161 (es->es_pblk & ~ES_MASK);
164 static inline void ext4_es_store_pblock_status(struct extent_status *es,
168 es->es_pblk = (((ext4_fsblk_t)status << ES_SHIFT) & ES_MASK) |
172 extern int ext4_es_register_shrinker(struct ext4_sb_info *sbi);
173 extern void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi);
175 extern int ext4_seq_es_shrinker_info_show(struct seq_file *seq, void *v);
177 #endif /* _EXT4_EXTENTS_STATUS_H */