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 * These flags live in the high bits of extent_status.es_pblk 25 */ 26 #define EXTENT_STATUS_WRITTEN (1ULL << 63) 27 #define EXTENT_STATUS_UNWRITTEN (1ULL << 62) 28 #define EXTENT_STATUS_DELAYED (1ULL << 61) 29 #define EXTENT_STATUS_HOLE (1ULL << 60) 30 31 #define EXTENT_STATUS_FLAGS (EXTENT_STATUS_WRITTEN | \ 32 EXTENT_STATUS_UNWRITTEN | \ 33 EXTENT_STATUS_DELAYED | \ 34 EXTENT_STATUS_HOLE) 35 36 struct extent_status { 37 struct rb_node rb_node; 38 ext4_lblk_t es_lblk; /* first logical block extent covers */ 39 ext4_lblk_t es_len; /* length of extent in block */ 40 ext4_fsblk_t es_pblk; /* first physical block */ 41 }; 42 43 struct ext4_es_tree { 44 struct rb_root root; 45 struct extent_status *cache_es; /* recently accessed extent */ 46 }; 47 48 extern int __init ext4_init_es(void); 49 extern void ext4_exit_es(void); 50 extern void ext4_es_init_tree(struct ext4_es_tree *tree); 51 52 extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk, 53 ext4_lblk_t len, ext4_fsblk_t pblk, 54 unsigned long long status); 55 extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk, 56 ext4_lblk_t len); 57 extern void ext4_es_find_delayed_extent(struct inode *inode, ext4_lblk_t lblk, 58 struct extent_status *es); 59 extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk, 60 struct extent_status *es); 61 62 static inline int ext4_es_is_written(struct extent_status *es) 63 { 64 return (es->es_pblk & EXTENT_STATUS_WRITTEN) != 0; 65 } 66 67 static inline int ext4_es_is_unwritten(struct extent_status *es) 68 { 69 return (es->es_pblk & EXTENT_STATUS_UNWRITTEN) != 0; 70 } 71 72 static inline int ext4_es_is_delayed(struct extent_status *es) 73 { 74 return (es->es_pblk & EXTENT_STATUS_DELAYED) != 0; 75 } 76 77 static inline int ext4_es_is_hole(struct extent_status *es) 78 { 79 return (es->es_pblk & EXTENT_STATUS_HOLE) != 0; 80 } 81 82 static inline ext4_fsblk_t ext4_es_status(struct extent_status *es) 83 { 84 return (es->es_pblk & EXTENT_STATUS_FLAGS); 85 } 86 87 static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es) 88 { 89 return (es->es_pblk & ~EXTENT_STATUS_FLAGS); 90 } 91 92 static inline void ext4_es_store_pblock(struct extent_status *es, 93 ext4_fsblk_t pb) 94 { 95 ext4_fsblk_t block; 96 97 block = (pb & ~EXTENT_STATUS_FLAGS) | 98 (es->es_pblk & EXTENT_STATUS_FLAGS); 99 es->es_pblk = block; 100 } 101 102 static inline void ext4_es_store_status(struct extent_status *es, 103 unsigned long long status) 104 { 105 ext4_fsblk_t block; 106 107 block = (status & EXTENT_STATUS_FLAGS) | 108 (es->es_pblk & ~EXTENT_STATUS_FLAGS); 109 es->es_pblk = block; 110 } 111 112 extern void ext4_es_register_shrinker(struct super_block *sb); 113 extern void ext4_es_unregister_shrinker(struct super_block *sb); 114 extern void ext4_es_lru_add(struct inode *inode); 115 extern void ext4_es_lru_del(struct inode *inode); 116 117 #endif /* _EXT4_EXTENTS_STATUS_H */ 118