projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| c0677e6d ZL |
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 | ||
| 654598be ZL |
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 | ||
| fdc0212e ZL |
23 | #define EXTENT_STATUS_WRITTEN 0x80000000 /* written extent */ |
| 24 | #define EXTENT_STATUS_UNWRITTEN 0x40000000 /* unwritten extent */ | |
| 25 | #define EXTENT_STATUS_DELAYED 0x20000000 /* delayed extent */ | |
| 26 | #define EXTENT_STATUS_HOLE 0x10000000 /* hole */ | |
| 27 | ||
| 28 | #define EXTENT_STATUS_FLAGS (EXTENT_STATUS_WRITTEN | \ | |
| 29 | EXTENT_STATUS_UNWRITTEN | \ | |
| 30 | EXTENT_STATUS_DELAYED | \ | |
| 31 | EXTENT_STATUS_HOLE) | |
| 32 | ||
| c0677e6d ZL |
33 | struct extent_status { |
| 34 | struct rb_node rb_node; | |
| 06b0c886 ZL |
35 | ext4_lblk_t es_lblk; /* first logical block extent covers */ |
| 36 | ext4_lblk_t es_len; /* length of extent in block */ | |
| fdc0212e | 37 | ext4_fsblk_t es_pblk; /* first physical block */ |
| c0677e6d ZL |
38 | }; |
| 39 | ||
| 40 | struct ext4_es_tree { | |
| 41 | struct rb_root root; | |
| 42 | struct extent_status *cache_es; /* recently accessed extent */ | |
| 43 | }; | |
| 44 | ||
| 654598be ZL |
45 | extern int __init ext4_init_es(void); |
| 46 | extern void ext4_exit_es(void); | |
| 47 | extern void ext4_es_init_tree(struct ext4_es_tree *tree); | |
| 48 | ||
| 06b0c886 | 49 | extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk, |
| fdc0212e ZL |
50 | ext4_lblk_t len, ext4_fsblk_t pblk, |
| 51 | unsigned long long status); | |
| 06b0c886 | 52 | extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk, |
| 654598be | 53 | ext4_lblk_t len); |
| be401363 ZL |
54 | extern void ext4_es_find_delayed_extent(struct inode *inode, ext4_lblk_t lblk, |
| 55 | struct extent_status *es); | |
| d100eef2 ZL |
56 | extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk, |
| 57 | struct extent_status *es); | |
| 654598be | 58 | |
| fdc0212e ZL |
59 | static inline int ext4_es_is_written(struct extent_status *es) |
| 60 | { | |
| 61 | return (es->es_pblk & EXTENT_STATUS_WRITTEN); | |
| 62 | } | |
| 63 | ||
| 64 | static inline int ext4_es_is_unwritten(struct extent_status *es) | |
| 65 | { | |
| 66 | return (es->es_pblk & EXTENT_STATUS_UNWRITTEN); | |
| 67 | } | |
| 68 | ||
| 69 | static inline int ext4_es_is_delayed(struct extent_status *es) | |
| 70 | { | |
| 71 | return (es->es_pblk & EXTENT_STATUS_DELAYED); | |
| 72 | } | |
| 73 | ||
| 74 | static inline int ext4_es_is_hole(struct extent_status *es) | |
| 75 | { | |
| 76 | return (es->es_pblk & EXTENT_STATUS_HOLE); | |
| 77 | } | |
| 78 | ||
| 79 | static inline ext4_fsblk_t ext4_es_status(struct extent_status *es) | |
| 80 | { | |
| 81 | return (es->es_pblk & EXTENT_STATUS_FLAGS); | |
| 82 | } | |
| 83 | ||
| 84 | static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es) | |
| 85 | { | |
| 86 | return (es->es_pblk & ~EXTENT_STATUS_FLAGS); | |
| 87 | } | |
| 88 | ||
| 89 | static inline void ext4_es_store_pblock(struct extent_status *es, | |
| 90 | ext4_fsblk_t pb) | |
| 91 | { | |
| 92 | ext4_fsblk_t block; | |
| 93 | ||
| 94 | block = (pb & ~EXTENT_STATUS_FLAGS) | | |
| 95 | (es->es_pblk & EXTENT_STATUS_FLAGS); | |
| 96 | es->es_pblk = block; | |
| 97 | } | |
| 98 | ||
| 99 | static inline void ext4_es_store_status(struct extent_status *es, | |
| 100 | unsigned long long status) | |
| 101 | { | |
| 102 | ext4_fsblk_t block; | |
| 103 | ||
| 104 | block = (status & EXTENT_STATUS_FLAGS) | | |
| 105 | (es->es_pblk & ~EXTENT_STATUS_FLAGS); | |
| 106 | es->es_pblk = block; | |
| 107 | } | |
| 108 | ||
| 74cd15cd ZL |
109 | extern void ext4_es_register_shrinker(struct super_block *sb); |
| 110 | extern void ext4_es_unregister_shrinker(struct super_block *sb); | |
| 111 | extern void ext4_es_lru_add(struct inode *inode); | |
| 112 | extern void ext4_es_lru_del(struct inode *inode); | |
| 113 | ||
| c0677e6d | 114 | #endif /* _EXT4_EXTENTS_STATUS_H */ |