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 EXTENT_STATUS_WRITTEN (1ULL << 63) 33 #define EXTENT_STATUS_UNWRITTEN (1ULL << 62) 34 #define EXTENT_STATUS_DELAYED (1ULL << 61) 35 #define EXTENT_STATUS_HOLE (1ULL << 60) 36 37 #define EXTENT_STATUS_FLAGS (EXTENT_STATUS_WRITTEN | \ 38 EXTENT_STATUS_UNWRITTEN | \ 39 EXTENT_STATUS_DELAYED | \ 40 EXTENT_STATUS_HOLE) 41 42 struct ext4_extent; 43 44 struct extent_status { 45 struct rb_node rb_node; 46 ext4_lblk_t es_lblk; /* first logical block extent covers */ 47 ext4_lblk_t es_len; /* length of extent in block */ 48 ext4_fsblk_t es_pblk; /* first physical block */ 49 }; 50 51 struct ext4_es_tree { 52 struct rb_root root; 53 struct extent_status *cache_es; /* recently accessed extent */ 54 }; 55 56 extern int __init ext4_init_es(void); 57 extern void ext4_exit_es(void); 58 extern void ext4_es_init_tree(struct ext4_es_tree *tree); 59 60 extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk, 61 ext4_lblk_t len, ext4_fsblk_t pblk, 62 unsigned long long status); 63 extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk, 64 ext4_lblk_t len); 65 extern void ext4_es_find_delayed_extent(struct inode *inode, ext4_lblk_t lblk, 66 struct extent_status *es); 67 extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk, 68 struct extent_status *es); 69 extern int ext4_es_zeroout(struct inode *inode, struct ext4_extent *ex); 70 71 static inline int ext4_es_is_written(struct extent_status *es) 72 { 73 return (es->es_pblk & EXTENT_STATUS_WRITTEN) != 0; 74 } 75 76 static inline int ext4_es_is_unwritten(struct extent_status *es) 77 { 78 return (es->es_pblk & EXTENT_STATUS_UNWRITTEN) != 0; 79 } 80 81 static inline int ext4_es_is_delayed(struct extent_status *es) 82 { 83 return (es->es_pblk & EXTENT_STATUS_DELAYED) != 0; 84 } 85 86 static inline int ext4_es_is_hole(struct extent_status *es) 87 { 88 return (es->es_pblk & EXTENT_STATUS_HOLE) != 0; 89 } 90 91 static inline ext4_fsblk_t ext4_es_status(struct extent_status *es) 92 { 93 return (es->es_pblk & EXTENT_STATUS_FLAGS); 94 } 95 96 static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es) 97 { 98 return (es->es_pblk & ~EXTENT_STATUS_FLAGS); 99 } 100 101 static inline void ext4_es_store_pblock(struct extent_status *es, 102 ext4_fsblk_t pb) 103 { 104 ext4_fsblk_t block; 105 106 block = (pb & ~EXTENT_STATUS_FLAGS) | 107 (es->es_pblk & EXTENT_STATUS_FLAGS); 108 es->es_pblk = block; 109 } 110 111 static inline void ext4_es_store_status(struct extent_status *es, 112 unsigned long long status) 113 { 114 ext4_fsblk_t block; 115 116 block = (status & EXTENT_STATUS_FLAGS) | 117 (es->es_pblk & ~EXTENT_STATUS_FLAGS); 118 es->es_pblk = block; 119 } 120 121 extern void ext4_es_register_shrinker(struct super_block *sb); 122 extern void ext4_es_unregister_shrinker(struct super_block *sb); 123 extern void ext4_es_lru_add(struct inode *inode); 124 extern void ext4_es_lru_del(struct inode *inode); 125 126 #endif /* _EXT4_EXTENTS_STATUS_H */ 127