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_sb_info; 43 struct ext4_extent; 44 45 struct extent_status { 46 struct rb_node rb_node; 47 ext4_lblk_t es_lblk; /* first logical block extent covers */ 48 ext4_lblk_t es_len; /* length of extent in block */ 49 ext4_fsblk_t es_pblk; /* first physical block */ 50 }; 51 52 struct ext4_es_tree { 53 struct rb_root root; 54 struct extent_status *cache_es; /* recently accessed extent */ 55 }; 56 57 extern int __init ext4_init_es(void); 58 extern void ext4_exit_es(void); 59 extern void ext4_es_init_tree(struct ext4_es_tree *tree); 60 61 extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk, 62 ext4_lblk_t len, ext4_fsblk_t pblk, 63 unsigned long long status); 64 extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk, 65 ext4_lblk_t len); 66 extern void ext4_es_find_delayed_extent_range(struct inode *inode, 67 ext4_lblk_t lblk, ext4_lblk_t end, 68 struct extent_status *es); 69 extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk, 70 struct extent_status *es); 71 extern int ext4_es_zeroout(struct inode *inode, struct ext4_extent *ex); 72 73 static inline int ext4_es_is_written(struct extent_status *es) 74 { 75 return (es->es_pblk & EXTENT_STATUS_WRITTEN) != 0; 76 } 77 78 static inline int ext4_es_is_unwritten(struct extent_status *es) 79 { 80 return (es->es_pblk & EXTENT_STATUS_UNWRITTEN) != 0; 81 } 82 83 static inline int ext4_es_is_delayed(struct extent_status *es) 84 { 85 return (es->es_pblk & EXTENT_STATUS_DELAYED) != 0; 86 } 87 88 static inline int ext4_es_is_hole(struct extent_status *es) 89 { 90 return (es->es_pblk & EXTENT_STATUS_HOLE) != 0; 91 } 92 93 static inline ext4_fsblk_t ext4_es_status(struct extent_status *es) 94 { 95 return (es->es_pblk & EXTENT_STATUS_FLAGS); 96 } 97 98 static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es) 99 { 100 return (es->es_pblk & ~EXTENT_STATUS_FLAGS); 101 } 102 103 static inline void ext4_es_store_pblock(struct extent_status *es, 104 ext4_fsblk_t pb) 105 { 106 ext4_fsblk_t block; 107 108 block = (pb & ~EXTENT_STATUS_FLAGS) | 109 (es->es_pblk & EXTENT_STATUS_FLAGS); 110 es->es_pblk = block; 111 } 112 113 static inline void ext4_es_store_status(struct extent_status *es, 114 unsigned long long status) 115 { 116 ext4_fsblk_t block; 117 118 block = (status & EXTENT_STATUS_FLAGS) | 119 (es->es_pblk & ~EXTENT_STATUS_FLAGS); 120 es->es_pblk = block; 121 } 122 123 extern void ext4_es_register_shrinker(struct ext4_sb_info *sbi); 124 extern void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi); 125 extern void ext4_es_lru_add(struct inode *inode); 126 extern void ext4_es_lru_del(struct inode *inode); 127 128 #endif /* _EXT4_EXTENTS_STATUS_H */ 129