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 #define ES_SHIFT 60 33 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) 38 39 #define EXTENT_STATUS_FLAGS (EXTENT_STATUS_WRITTEN | \ 40 EXTENT_STATUS_UNWRITTEN | \ 41 EXTENT_STATUS_DELAYED | \ 42 EXTENT_STATUS_HOLE) 43 44 #define ES_WRITTEN (1ULL << 63) 45 #define ES_UNWRITTEN (1ULL << 62) 46 #define ES_DELAYED (1ULL << 61) 47 #define ES_HOLE (1ULL << 60) 48 49 #define ES_MASK (ES_WRITTEN | ES_UNWRITTEN | \ 50 ES_DELAYED | ES_HOLE) 51 52 struct ext4_sb_info; 53 struct ext4_extent; 54 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 */ 60 }; 61 62 struct ext4_es_tree { 63 struct rb_root root; 64 struct extent_status *cache_es; /* recently accessed extent */ 65 }; 66 67 extern int __init ext4_init_es(void); 68 extern void ext4_exit_es(void); 69 extern void ext4_es_init_tree(struct ext4_es_tree *tree); 70 71 extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk, 72 ext4_lblk_t len, ext4_fsblk_t pblk, 73 unsigned int status); 74 extern void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk, 75 ext4_lblk_t len, ext4_fsblk_t pblk, 76 unsigned int status); 77 extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk, 78 ext4_lblk_t len); 79 extern void ext4_es_find_delayed_extent_range(struct inode *inode, 80 ext4_lblk_t lblk, ext4_lblk_t end, 81 struct extent_status *es); 82 extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk, 83 struct extent_status *es); 84 85 static inline int ext4_es_is_written(struct extent_status *es) 86 { 87 return (es->es_pblk & ES_WRITTEN) != 0; 88 } 89 90 static inline int ext4_es_is_unwritten(struct extent_status *es) 91 { 92 return (es->es_pblk & ES_UNWRITTEN) != 0; 93 } 94 95 static inline int ext4_es_is_delayed(struct extent_status *es) 96 { 97 return (es->es_pblk & ES_DELAYED) != 0; 98 } 99 100 static inline int ext4_es_is_hole(struct extent_status *es) 101 { 102 return (es->es_pblk & ES_HOLE) != 0; 103 } 104 105 static inline unsigned int ext4_es_status(struct extent_status *es) 106 { 107 return es->es_pblk >> ES_SHIFT; 108 } 109 110 static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es) 111 { 112 return es->es_pblk & ~ES_MASK; 113 } 114 115 static inline void ext4_es_store_pblock(struct extent_status *es, 116 ext4_fsblk_t pb) 117 { 118 ext4_fsblk_t block; 119 120 block = (pb & ~ES_MASK) | (es->es_pblk & ES_MASK); 121 es->es_pblk = block; 122 } 123 124 static inline void ext4_es_store_status(struct extent_status *es, 125 unsigned int status) 126 { 127 es->es_pblk = (((ext4_fsblk_t) 128 (status & EXTENT_STATUS_FLAGS) << ES_SHIFT) | 129 (es->es_pblk & ~ES_MASK)); 130 } 131 132 extern void ext4_es_register_shrinker(struct ext4_sb_info *sbi); 133 extern void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi); 134 extern void ext4_es_lru_add(struct inode *inode); 135 extern void ext4_es_lru_del(struct inode *inode); 136 137 #endif /* _EXT4_EXTENTS_STATUS_H */ 138