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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - fs/ext4/extents_status.h
2 * fs/ext4/extents_status.h
4 * Written by Yongqiang Yang <xiaoqiangnk@gmail.com>
6 * Allison Henderson <achender@linux.vnet.ibm.com>
7 * Zheng Liu <wenqing.lz@taobao.com>
11 #ifndef _EXT4_EXTENTS_STATUS_H
12 #define _EXT4_EXTENTS_STATUS_H
15 * Turn on ES_DEBUG__ to get lots of info about extent status operations.
18 #define es_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
20 #define es_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
24 * With ES_AGGRESSIVE_TEST defined, the result of es caching will be
25 * checked with old map_block's result.
27 #define ES_AGGRESSIVE_TEST__
30 * These flags live in the high bits of extent_status.es_pblk
32 #define EXTENT_STATUS_WRITTEN (1ULL << 63)
33 #define EXTENT_STATUS_UNWRITTEN (1ULL << 62)
34 #define EXTENT_STATUS_DELAYED (1ULL << 61)
35 #define EXTENT_STATUS_HOLE (1ULL << 60)
37 #define EXTENT_STATUS_FLAGS (EXTENT_STATUS_WRITTEN | \
38 EXTENT_STATUS_UNWRITTEN | \
39 EXTENT_STATUS_DELAYED | \
45 struct extent_status
{
46 struct rb_node rb_node
;
47 ext4_lblk_t es_lblk
; /* first logical block extent covers */
48 ext4_lblk_t es_len
; /* length of extent in block */
49 ext4_fsblk_t es_pblk
; /* first physical block */
54 struct extent_status
*cache_es
; /* recently accessed extent */
57 extern int __init
ext4_init_es(void);
58 extern void ext4_exit_es(void);
59 extern void ext4_es_init_tree(struct ext4_es_tree
*tree
);
61 extern int ext4_es_insert_extent(struct inode
*inode
, ext4_lblk_t lblk
,
62 ext4_lblk_t len
, ext4_fsblk_t pblk
,
63 unsigned long long status
);
64 extern int ext4_es_remove_extent(struct inode
*inode
, ext4_lblk_t lblk
,
66 extern void ext4_es_find_delayed_extent_range(struct inode
*inode
,
67 ext4_lblk_t lblk
, ext4_lblk_t end
,
68 struct extent_status
*es
);
69 extern int ext4_es_lookup_extent(struct inode
*inode
, ext4_lblk_t lblk
,
70 struct extent_status
*es
);
71 extern int ext4_es_zeroout(struct inode
*inode
, struct ext4_extent
*ex
);
73 static inline int ext4_es_is_written(struct extent_status
*es
)
75 return (es
->es_pblk
& EXTENT_STATUS_WRITTEN
) != 0;
78 static inline int ext4_es_is_unwritten(struct extent_status
*es
)
80 return (es
->es_pblk
& EXTENT_STATUS_UNWRITTEN
) != 0;
83 static inline int ext4_es_is_delayed(struct extent_status
*es
)
85 return (es
->es_pblk
& EXTENT_STATUS_DELAYED
) != 0;
88 static inline int ext4_es_is_hole(struct extent_status
*es
)
90 return (es
->es_pblk
& EXTENT_STATUS_HOLE
) != 0;
93 static inline ext4_fsblk_t
ext4_es_status(struct extent_status
*es
)
95 return (es
->es_pblk
& EXTENT_STATUS_FLAGS
);
98 static inline ext4_fsblk_t
ext4_es_pblock(struct extent_status
*es
)
100 return (es
->es_pblk
& ~EXTENT_STATUS_FLAGS
);
103 static inline void ext4_es_store_pblock(struct extent_status
*es
,
108 block
= (pb
& ~EXTENT_STATUS_FLAGS
) |
109 (es
->es_pblk
& EXTENT_STATUS_FLAGS
);
113 static inline void ext4_es_store_status(struct extent_status
*es
,
114 unsigned long long status
)
118 block
= (status
& EXTENT_STATUS_FLAGS
) |
119 (es
->es_pblk
& ~EXTENT_STATUS_FLAGS
);
123 extern void ext4_es_register_shrinker(struct ext4_sb_info
*sbi
);
124 extern void ext4_es_unregister_shrinker(struct ext4_sb_info
*sbi
);
125 extern void ext4_es_lru_add(struct inode
*inode
);
126 extern void ext4_es_lru_del(struct inode
*inode
);
128 #endif /* _EXT4_EXTENTS_STATUS_H */