diff options
Diffstat (limited to 'fs/ext4/extents_status.h')
| -rw-r--r-- | fs/ext4/extents_status.h | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/fs/ext4/extents_status.h b/fs/ext4/extents_status.h new file mode 100644 index 00000000000..f1b62a41992 --- /dev/null +++ b/fs/ext4/extents_status.h @@ -0,0 +1,146 @@ +/* + * 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 void ext4_es_cache_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); + +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)); +} + +static inline void ext4_es_store_pblock_status(struct extent_status *es, + ext4_fsblk_t pb, + unsigned int status) +{ + es->es_pblk = (((ext4_fsblk_t) + (status & EXTENT_STATUS_FLAGS) << ES_SHIFT) | + (pb & ~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 */ |