| /* |
| * fs/ext4/extents_status.h |
| * |
| * Written by Yongqiang Yang <xiaoqiangnk@gmail.com> |
| * Modified by |
| * Allison Henderson <achender@linux.vnet.ibm.com> |
| * Zheng Liu <wenqing.lz@taobao.com> |
| * |
| */ |
| |
| #ifndef _EXT4_EXTENTS_STATUS_H |
| #define _EXT4_EXTENTS_STATUS_H |
| |
| /* |
| * Turn on ES_DEBUG__ to get lots of info about extent status operations. |
| */ |
| #ifdef ES_DEBUG__ |
| #define es_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) |
| #else |
| #define es_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) |
| #endif |
| |
| /* |
| * With ES_AGGRESSIVE_TEST defined, the result of es caching will be |
| * checked with old map_block's result. |
| */ |
| #define ES_AGGRESSIVE_TEST__ |
| |
| /* |
| * These flags live in the high bits of extent_status.es_pblk |
| */ |
| #define ES_SHIFT 60 |
| |
| #define EXTENT_STATUS_WRITTEN (1 << 3) |
| #define EXTENT_STATUS_UNWRITTEN (1 << 2) |
| #define EXTENT_STATUS_DELAYED (1 << 1) |
| #define EXTENT_STATUS_HOLE (1 << 0) |
| |
| #define EXTENT_STATUS_FLAGS (EXTENT_STATUS_WRITTEN | \ |
| EXTENT_STATUS_UNWRITTEN | \ |
| EXTENT_STATUS_DELAYED | \ |
| EXTENT_STATUS_HOLE) |
| |
| #define ES_WRITTEN (1ULL << 63) |
| #define ES_UNWRITTEN (1ULL << 62) |
| #define ES_DELAYED (1ULL << 61) |
| #define ES_HOLE (1ULL << 60) |
| |
| #define ES_MASK (ES_WRITTEN | ES_UNWRITTEN | \ |
| ES_DELAYED | ES_HOLE) |
| |
| struct ext4_sb_info; |
| struct ext4_extent; |
| |
| struct extent_status { |
| struct rb_node rb_node; |
| ext4_lblk_t es_lblk; /* first logical block extent covers */ |
| ext4_lblk_t es_len; /* length of extent in block */ |
| ext4_fsblk_t es_pblk; /* first physical block */ |
| }; |
| |
| struct ext4_es_tree { |
| struct rb_root root; |
| struct extent_status *cache_es; /* recently accessed extent */ |
| }; |
| |
| extern int __init ext4_init_es(void); |
| extern void ext4_exit_es(void); |
| extern void ext4_es_init_tree(struct ext4_es_tree *tree); |
| |
| extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk, |
| ext4_lblk_t len, ext4_fsblk_t pblk, |
| unsigned int status); |
| extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk, |
| ext4_lblk_t len); |
| extern void ext4_es_find_delayed_extent_range(struct inode *inode, |
| ext4_lblk_t lblk, ext4_lblk_t end, |
| struct extent_status *es); |
| extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk, |
| struct extent_status *es); |
| extern int ext4_es_zeroout(struct inode *inode, struct ext4_extent *ex); |
| |
| static inline int ext4_es_is_written(struct extent_status *es) |
| { |
| return (es->es_pblk & ES_WRITTEN) != 0; |
| } |
| |
| static inline int ext4_es_is_unwritten(struct extent_status *es) |
| { |
| return (es->es_pblk & ES_UNWRITTEN) != 0; |
| } |
| |
| static inline int ext4_es_is_delayed(struct extent_status *es) |
| { |
| return (es->es_pblk & ES_DELAYED) != 0; |
| } |
| |
| static inline int ext4_es_is_hole(struct extent_status *es) |
| { |
| return (es->es_pblk & ES_HOLE) != 0; |
| } |
| |
| static inline unsigned int ext4_es_status(struct extent_status *es) |
| { |
| return es->es_pblk >> ES_SHIFT; |
| } |
| |
| static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es) |
| { |
| return es->es_pblk & ~ES_MASK; |
| } |
| |
| static inline void ext4_es_store_pblock(struct extent_status *es, |
| ext4_fsblk_t pb) |
| { |
| ext4_fsblk_t block; |
| |
| block = (pb & ~ES_MASK) | (es->es_pblk & ES_MASK); |
| es->es_pblk = block; |
| } |
| |
| static inline void ext4_es_store_status(struct extent_status *es, |
| unsigned int status) |
| { |
| es->es_pblk = (((ext4_fsblk_t) |
| (status & EXTENT_STATUS_FLAGS) << ES_SHIFT) | |
| (es->es_pblk & ~ES_MASK)); |
| } |
| |
| extern void ext4_es_register_shrinker(struct ext4_sb_info *sbi); |
| extern void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi); |
| extern void ext4_es_lru_add(struct inode *inode); |
| extern void ext4_es_lru_del(struct inode *inode); |
| |
| #endif /* _EXT4_EXTENTS_STATUS_H */ |