1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * fs/ext4/extents_status.h 4 * 5 * Written by Yongqiang Yang <xiaoqiangnk@gmail.com> 6 * Modified by 7 * Allison Henderson <achender@linux.vnet.ibm.com> 8 * Zheng Liu <wenqing.lz@taobao.com> 9 * 10 */ 11 12 #ifndef _EXT4_EXTENTS_STATUS_H 13 #define _EXT4_EXTENTS_STATUS_H 14 15 /* 16 * Turn on ES_DEBUG__ to get lots of info about extent status operations. 17 */ 18 #ifdef ES_DEBUG__ 19 #define es_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) 20 #else 21 #define es_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 22 #endif 23 24 /* 25 * With ES_AGGRESSIVE_TEST defined, the result of es caching will be 26 * checked with old map_block's result. 27 */ 28 #define ES_AGGRESSIVE_TEST__ 29 30 /* 31 * These flags live in the high bits of extent_status.es_pblk 32 */ 33 enum { 34 ES_WRITTEN_B, 35 ES_UNWRITTEN_B, 36 ES_DELAYED_B, 37 ES_HOLE_B, 38 ES_REFERENCED_B, 39 ES_FLAGS 40 }; 41 42 #define ES_SHIFT (sizeof(ext4_fsblk_t)*8 - ES_FLAGS) 43 #define ES_MASK (~((ext4_fsblk_t)0) << ES_SHIFT) 44 45 #define EXTENT_STATUS_WRITTEN (1 << ES_WRITTEN_B) 46 #define EXTENT_STATUS_UNWRITTEN (1 << ES_UNWRITTEN_B) 47 #define EXTENT_STATUS_DELAYED (1 << ES_DELAYED_B) 48 #define EXTENT_STATUS_HOLE (1 << ES_HOLE_B) 49 #define EXTENT_STATUS_REFERENCED (1 << ES_REFERENCED_B) 50 51 #define ES_TYPE_MASK ((ext4_fsblk_t)(EXTENT_STATUS_WRITTEN | \ 52 EXTENT_STATUS_UNWRITTEN | \ 53 EXTENT_STATUS_DELAYED | \ 54 EXTENT_STATUS_HOLE) << ES_SHIFT) 55 56 struct ext4_sb_info; 57 struct ext4_extent; 58 59 struct extent_status { 60 struct rb_node rb_node; 61 ext4_lblk_t es_lblk; /* first logical block extent covers */ 62 ext4_lblk_t es_len; /* length of extent in block */ 63 ext4_fsblk_t es_pblk; /* first physical block */ 64 }; 65 66 struct ext4_es_tree { 67 struct rb_root root; 68 struct extent_status *cache_es; /* recently accessed extent */ 69 }; 70 71 struct ext4_es_stats { 72 unsigned long es_stats_shrunk; 73 unsigned long es_stats_cache_hits; 74 unsigned long es_stats_cache_misses; 75 u64 es_stats_scan_time; 76 u64 es_stats_max_scan_time; 77 struct percpu_counter es_stats_all_cnt; 78 struct percpu_counter es_stats_shk_cnt; 79 }; 80 81 extern int __init ext4_init_es(void); 82 extern void ext4_exit_es(void); 83 extern void ext4_es_init_tree(struct ext4_es_tree *tree); 84 85 extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk, 86 ext4_lblk_t len, ext4_fsblk_t pblk, 87 unsigned int status); 88 extern void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk, 89 ext4_lblk_t len, ext4_fsblk_t pblk, 90 unsigned int status); 91 extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk, 92 ext4_lblk_t len); 93 extern void ext4_es_find_delayed_extent_range(struct inode *inode, 94 ext4_lblk_t lblk, ext4_lblk_t end, 95 struct extent_status *es); 96 extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk, 97 struct extent_status *es); 98 99 static inline unsigned int ext4_es_status(struct extent_status *es) 100 { 101 return es->es_pblk >> ES_SHIFT; 102 } 103 104 static inline unsigned int ext4_es_type(struct extent_status *es) 105 { 106 return (es->es_pblk & ES_TYPE_MASK) >> ES_SHIFT; 107 } 108 109 static inline int ext4_es_is_written(struct extent_status *es) 110 { 111 return (ext4_es_type(es) & EXTENT_STATUS_WRITTEN) != 0; 112 } 113 114 static inline int ext4_es_is_unwritten(struct extent_status *es) 115 { 116 return (ext4_es_type(es) & EXTENT_STATUS_UNWRITTEN) != 0; 117 } 118 119 static inline int ext4_es_is_delayed(struct extent_status *es) 120 { 121 return (ext4_es_type(es) & EXTENT_STATUS_DELAYED) != 0; 122 } 123 124 static inline int ext4_es_is_hole(struct extent_status *es) 125 { 126 return (ext4_es_type(es) & EXTENT_STATUS_HOLE) != 0; 127 } 128 129 static inline void ext4_es_set_referenced(struct extent_status *es) 130 { 131 es->es_pblk |= ((ext4_fsblk_t)EXTENT_STATUS_REFERENCED) << ES_SHIFT; 132 } 133 134 static inline void ext4_es_clear_referenced(struct extent_status *es) 135 { 136 es->es_pblk &= ~(((ext4_fsblk_t)EXTENT_STATUS_REFERENCED) << ES_SHIFT); 137 } 138 139 static inline int ext4_es_is_referenced(struct extent_status *es) 140 { 141 return (ext4_es_status(es) & EXTENT_STATUS_REFERENCED) != 0; 142 } 143 144 static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es) 145 { 146 return es->es_pblk & ~ES_MASK; 147 } 148 149 static inline void ext4_es_store_pblock(struct extent_status *es, 150 ext4_fsblk_t pb) 151 { 152 ext4_fsblk_t block; 153 154 block = (pb & ~ES_MASK) | (es->es_pblk & ES_MASK); 155 es->es_pblk = block; 156 } 157 158 static inline void ext4_es_store_status(struct extent_status *es, 159 unsigned int status) 160 { 161 es->es_pblk = (((ext4_fsblk_t)status << ES_SHIFT) & ES_MASK) | 162 (es->es_pblk & ~ES_MASK); 163 } 164 165 static inline void ext4_es_store_pblock_status(struct extent_status *es, 166 ext4_fsblk_t pb, 167 unsigned int status) 168 { 169 es->es_pblk = (((ext4_fsblk_t)status << ES_SHIFT) & ES_MASK) | 170 (pb & ~ES_MASK); 171 } 172 173 extern int ext4_es_register_shrinker(struct ext4_sb_info *sbi); 174 extern void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi); 175 176 extern int ext4_seq_es_shrinker_info_show(struct seq_file *seq, void *v); 177 178 #endif /* _EXT4_EXTENTS_STATUS_H */ 179