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 98 static inline unsigned int ext4_es_status(struct extent_status *es) 99 { 100 return es->es_pblk >> ES_SHIFT; 101 } 102 103 static inline unsigned int ext4_es_type(struct extent_status *es) 104 { 105 return (es->es_pblk & ES_TYPE_MASK) >> ES_SHIFT; 106 } 107 108 static inline int ext4_es_is_written(struct extent_status *es) 109 { 110 return (ext4_es_type(es) & EXTENT_STATUS_WRITTEN) != 0; 111 } 112 113 static inline int ext4_es_is_unwritten(struct extent_status *es) 114 { 115 return (ext4_es_type(es) & EXTENT_STATUS_UNWRITTEN) != 0; 116 } 117 118 static inline int ext4_es_is_delayed(struct extent_status *es) 119 { 120 return (ext4_es_type(es) & EXTENT_STATUS_DELAYED) != 0; 121 } 122 123 static inline int ext4_es_is_hole(struct extent_status *es) 124 { 125 return (ext4_es_type(es) & EXTENT_STATUS_HOLE) != 0; 126 } 127 128 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 } 132 133 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 } 137 138 static inline int ext4_es_is_referenced(struct extent_status *es) 139 { 140 return (ext4_es_status(es) & EXTENT_STATUS_REFERENCED) != 0; 141 } 142 143 static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es) 144 { 145 return es->es_pblk & ~ES_MASK; 146 } 147 148 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 } 156 157 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 } 163 164 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