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 | ||
| 8e919d13 TT |
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) | |
| fdc0212e ZL |
30 | |
| 31 | #define EXTENT_STATUS_FLAGS (EXTENT_STATUS_WRITTEN | \ | |
| 32 | EXTENT_STATUS_UNWRITTEN | \ | |
| 33 | EXTENT_STATUS_DELAYED | \ | |
| 34 | EXTENT_STATUS_HOLE) | |
| 35 | ||
| c0677e6d ZL |
36 | struct extent_status { |
| 37 | struct rb_node rb_node; | |
| 06b0c886 ZL |
38 | ext4_lblk_t es_lblk; /* first logical block extent covers */ |
| 39 | ext4_lblk_t es_len; /* length of extent in block */ | |
| fdc0212e | 40 | ext4_fsblk_t es_pblk; /* first physical block */ |
| c0677e6d ZL |
41 | }; |
| 42 | ||
| 43 | struct ext4_es_tree { | |
| 44 | struct rb_root root; | |
| 45 | struct extent_status *cache_es; /* recently accessed extent */ | |
| 46 | }; | |
| 47 | ||
| 654598be ZL |
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 | ||
| 06b0c886 | 52 | extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk, |
| fdc0212e ZL |
53 | ext4_lblk_t len, ext4_fsblk_t pblk, |
| 54 | unsigned long long status); | |
| 06b0c886 | 55 | extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk, |
| 654598be | 56 | ext4_lblk_t len); |
| be401363 ZL |
57 | extern void ext4_es_find_delayed_extent(struct inode *inode, ext4_lblk_t lblk, |
| 58 | struct extent_status *es); | |
| d100eef2 ZL |
59 | extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk, |
| 60 | struct extent_status *es); | |
| 654598be | 61 | |
| fdc0212e ZL |
62 | static inline int ext4_es_is_written(struct extent_status *es) |
| 63 | { | |
| 8e919d13 | 64 | return (es->es_pblk & EXTENT_STATUS_WRITTEN) != 0; |
| fdc0212e ZL |
65 | } |
| 66 | ||
| 67 | static inline int ext4_es_is_unwritten(struct extent_status *es) | |
| 68 | { | |
| 8e919d13 | 69 | return (es->es_pblk & EXTENT_STATUS_UNWRITTEN) != 0; |
| fdc0212e ZL |
70 | } |
| 71 | ||
| 72 | static inline int ext4_es_is_delayed(struct extent_status *es) | |
| 73 | { | |
| 8e919d13 | 74 | return (es->es_pblk & EXTENT_STATUS_DELAYED) != 0; |
| fdc0212e ZL |
75 | } |
| 76 | ||
| 77 | static inline int ext4_es_is_hole(struct extent_status *es) | |
| 78 | { | |
| 8e919d13 | 79 | return (es->es_pblk & EXTENT_STATUS_HOLE) != 0; |
| fdc0212e ZL |
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 | ||
| 74cd15cd ZL |
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 | ||
| c0677e6d | 117 | #endif /* _EXT4_EXTENTS_STATUS_H */ |