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Zheng Liuc0677e62012-11-08 15:18:54 -05001/*
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
Zheng Liu654598b2012-11-08 21:57:20 -050014/*
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
Theodore Ts'o8e919d12013-02-27 14:54:37 -050023/*
Dmitry Monakhov921f2662013-03-10 21:01:03 -040024 * With ES_AGGRESSIVE_TEST defined, the result of es caching will be
25 * checked with old map_block's result.
26 */
27#define ES_AGGRESSIVE_TEST__
28
29/*
Theodore Ts'o8e919d12013-02-27 14:54:37 -050030 * These flags live in the high bits of extent_status.es_pblk
31 */
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)
Zheng Liufdc02122013-02-18 00:26:51 -050036
37#define EXTENT_STATUS_FLAGS (EXTENT_STATUS_WRITTEN | \
38 EXTENT_STATUS_UNWRITTEN | \
39 EXTENT_STATUS_DELAYED | \
40 EXTENT_STATUS_HOLE)
41
Zheng Liuadb23552013-03-10 21:13:05 -040042struct ext4_extent;
43
Zheng Liuc0677e62012-11-08 15:18:54 -050044struct extent_status {
45 struct rb_node rb_node;
Zheng Liu06b0c882013-02-18 00:26:51 -050046 ext4_lblk_t es_lblk; /* first logical block extent covers */
47 ext4_lblk_t es_len; /* length of extent in block */
Zheng Liufdc02122013-02-18 00:26:51 -050048 ext4_fsblk_t es_pblk; /* first physical block */
Zheng Liuc0677e62012-11-08 15:18:54 -050049};
50
51struct ext4_es_tree {
52 struct rb_root root;
53 struct extent_status *cache_es; /* recently accessed extent */
54};
55
Zheng Liu654598b2012-11-08 21:57:20 -050056extern int __init ext4_init_es(void);
57extern void ext4_exit_es(void);
58extern void ext4_es_init_tree(struct ext4_es_tree *tree);
59
Zheng Liu06b0c882013-02-18 00:26:51 -050060extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
Zheng Liufdc02122013-02-18 00:26:51 -050061 ext4_lblk_t len, ext4_fsblk_t pblk,
62 unsigned long long status);
Zheng Liu06b0c882013-02-18 00:26:51 -050063extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
Zheng Liu654598b2012-11-08 21:57:20 -050064 ext4_lblk_t len);
Zheng Liube401362013-02-18 00:27:26 -050065extern void ext4_es_find_delayed_extent(struct inode *inode, ext4_lblk_t lblk,
66 struct extent_status *es);
Zheng Liud100eef2013-02-18 00:29:59 -050067extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk,
68 struct extent_status *es);
Zheng Liuadb23552013-03-10 21:13:05 -040069extern int ext4_es_zeroout(struct inode *inode, struct ext4_extent *ex);
Zheng Liu654598b2012-11-08 21:57:20 -050070
Zheng Liufdc02122013-02-18 00:26:51 -050071static inline int ext4_es_is_written(struct extent_status *es)
72{
Theodore Ts'o8e919d12013-02-27 14:54:37 -050073 return (es->es_pblk & EXTENT_STATUS_WRITTEN) != 0;
Zheng Liufdc02122013-02-18 00:26:51 -050074}
75
76static inline int ext4_es_is_unwritten(struct extent_status *es)
77{
Theodore Ts'o8e919d12013-02-27 14:54:37 -050078 return (es->es_pblk & EXTENT_STATUS_UNWRITTEN) != 0;
Zheng Liufdc02122013-02-18 00:26:51 -050079}
80
81static inline int ext4_es_is_delayed(struct extent_status *es)
82{
Theodore Ts'o8e919d12013-02-27 14:54:37 -050083 return (es->es_pblk & EXTENT_STATUS_DELAYED) != 0;
Zheng Liufdc02122013-02-18 00:26:51 -050084}
85
86static inline int ext4_es_is_hole(struct extent_status *es)
87{
Theodore Ts'o8e919d12013-02-27 14:54:37 -050088 return (es->es_pblk & EXTENT_STATUS_HOLE) != 0;
Zheng Liufdc02122013-02-18 00:26:51 -050089}
90
91static inline ext4_fsblk_t ext4_es_status(struct extent_status *es)
92{
93 return (es->es_pblk & EXTENT_STATUS_FLAGS);
94}
95
96static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es)
97{
98 return (es->es_pblk & ~EXTENT_STATUS_FLAGS);
99}
100
101static inline void ext4_es_store_pblock(struct extent_status *es,
102 ext4_fsblk_t pb)
103{
104 ext4_fsblk_t block;
105
106 block = (pb & ~EXTENT_STATUS_FLAGS) |
107 (es->es_pblk & EXTENT_STATUS_FLAGS);
108 es->es_pblk = block;
109}
110
111static inline void ext4_es_store_status(struct extent_status *es,
112 unsigned long long status)
113{
114 ext4_fsblk_t block;
115
116 block = (status & EXTENT_STATUS_FLAGS) |
117 (es->es_pblk & ~EXTENT_STATUS_FLAGS);
118 es->es_pblk = block;
119}
120
Zheng Liu74cd15c2013-02-18 00:32:55 -0500121extern void ext4_es_register_shrinker(struct super_block *sb);
122extern void ext4_es_unregister_shrinker(struct super_block *sb);
123extern void ext4_es_lru_add(struct inode *inode);
124extern void ext4_es_lru_del(struct inode *inode);
125
Zheng Liuc0677e62012-11-08 15:18:54 -0500126#endif /* _EXT4_EXTENTS_STATUS_H */