1#ifndef _LINUX_CLEANCACHE_H
2#define _LINUX_CLEANCACHE_H
3
4#include <linux/fs.h>
5#include <linux/exportfs.h>
6#include <linux/mm.h>
7
8#define CLEANCACHE_KEY_MAX 6
9
10
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12
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14
15
16struct cleancache_filekey {
17 union {
18 ino_t ino;
19 __u32 fh[CLEANCACHE_KEY_MAX];
20 u32 key[CLEANCACHE_KEY_MAX];
21 } u;
22};
23
24struct cleancache_ops {
25 int (*init_fs)(size_t);
26 int (*init_shared_fs)(char *uuid, size_t);
27 int (*get_page)(int, struct cleancache_filekey,
28 pgoff_t, struct page *);
29 void (*put_page)(int, struct cleancache_filekey,
30 pgoff_t, struct page *);
31 void (*invalidate_page)(int, struct cleancache_filekey, pgoff_t);
32 void (*invalidate_inode)(int, struct cleancache_filekey);
33 void (*invalidate_fs)(int);
34};
35
36extern struct cleancache_ops *
37 cleancache_register_ops(struct cleancache_ops *ops);
38extern void __cleancache_init_fs(struct super_block *);
39extern void __cleancache_init_shared_fs(char *, struct super_block *);
40extern int __cleancache_get_page(struct page *);
41extern void __cleancache_put_page(struct page *);
42extern void __cleancache_invalidate_page(struct address_space *, struct page *);
43extern void __cleancache_invalidate_inode(struct address_space *);
44extern void __cleancache_invalidate_fs(struct super_block *);
45
46#ifdef CONFIG_CLEANCACHE
47#define cleancache_enabled (1)
48static inline bool cleancache_fs_enabled(struct page *page)
49{
50 return page->mapping->host->i_sb->cleancache_poolid >= 0;
51}
52static inline bool cleancache_fs_enabled_mapping(struct address_space *mapping)
53{
54 return mapping->host->i_sb->cleancache_poolid >= 0;
55}
56#else
57#define cleancache_enabled (0)
58#define cleancache_fs_enabled(_page) (0)
59#define cleancache_fs_enabled_mapping(_page) (0)
60#endif
61
62
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72
73
74
75static inline void cleancache_init_fs(struct super_block *sb)
76{
77 if (cleancache_enabled)
78 __cleancache_init_fs(sb);
79}
80
81static inline void cleancache_init_shared_fs(char *uuid, struct super_block *sb)
82{
83 if (cleancache_enabled)
84 __cleancache_init_shared_fs(uuid, sb);
85}
86
87static inline int cleancache_get_page(struct page *page)
88{
89 int ret = -1;
90
91 if (cleancache_enabled && cleancache_fs_enabled(page))
92 ret = __cleancache_get_page(page);
93 return ret;
94}
95
96static inline void cleancache_put_page(struct page *page)
97{
98 if (cleancache_enabled && cleancache_fs_enabled(page))
99 __cleancache_put_page(page);
100}
101
102static inline void cleancache_invalidate_page(struct address_space *mapping,
103 struct page *page)
104{
105
106 if (cleancache_enabled && cleancache_fs_enabled_mapping(mapping))
107 __cleancache_invalidate_page(mapping, page);
108}
109
110static inline void cleancache_invalidate_inode(struct address_space *mapping)
111{
112 if (cleancache_enabled && cleancache_fs_enabled_mapping(mapping))
113 __cleancache_invalidate_inode(mapping);
114}
115
116static inline void cleancache_invalidate_fs(struct super_block *sb)
117{
118 if (cleancache_enabled)
119 __cleancache_invalidate_fs(sb);
120}
121
122#endif
123