1 #ifndef _LINUX_FRONTSWAP_H
2 #define _LINUX_FRONTSWAP_H
4 #include <linux/swap.h>
6 #include <linux/bitops.h>
9 void (*init
)(unsigned);
10 int (*store
)(unsigned, pgoff_t
, struct page
*);
11 int (*load
)(unsigned, pgoff_t
, struct page
*);
12 void (*invalidate_page
)(unsigned, pgoff_t
);
13 void (*invalidate_area
)(unsigned);
16 extern bool frontswap_enabled
;
17 extern struct frontswap_ops
18 frontswap_register_ops(struct frontswap_ops
*ops
);
19 extern void frontswap_shrink(unsigned long);
20 extern unsigned long frontswap_curr_pages(void);
21 extern void frontswap_writethrough(bool);
22 #define FRONTSWAP_HAS_EXCLUSIVE_GETS
23 extern void frontswap_tmem_exclusive_gets(bool);
25 extern void __frontswap_init(unsigned type
);
26 extern int __frontswap_store(struct page
*page
);
27 extern int __frontswap_load(struct page
*page
);
28 extern void __frontswap_invalidate_page(unsigned, pgoff_t
);
29 extern void __frontswap_invalidate_area(unsigned);
31 #ifdef CONFIG_FRONTSWAP
33 static inline bool frontswap_test(struct swap_info_struct
*sis
, pgoff_t offset
)
37 if (frontswap_enabled
&& sis
->frontswap_map
)
38 ret
= test_bit(offset
, sis
->frontswap_map
);
42 static inline void frontswap_set(struct swap_info_struct
*sis
, pgoff_t offset
)
44 if (frontswap_enabled
&& sis
->frontswap_map
)
45 set_bit(offset
, sis
->frontswap_map
);
48 static inline void frontswap_clear(struct swap_info_struct
*sis
, pgoff_t offset
)
50 if (frontswap_enabled
&& sis
->frontswap_map
)
51 clear_bit(offset
, sis
->frontswap_map
);
54 static inline void frontswap_map_set(struct swap_info_struct
*p
,
57 p
->frontswap_map
= map
;
60 static inline unsigned long *frontswap_map_get(struct swap_info_struct
*p
)
62 return p
->frontswap_map
;
65 /* all inline routines become no-ops and all externs are ignored */
67 #define frontswap_enabled (0)
69 static inline bool frontswap_test(struct swap_info_struct
*sis
, pgoff_t offset
)
74 static inline void frontswap_set(struct swap_info_struct
*sis
, pgoff_t offset
)
78 static inline void frontswap_clear(struct swap_info_struct
*sis
, pgoff_t offset
)
82 static inline void frontswap_map_set(struct swap_info_struct
*p
,
87 static inline unsigned long *frontswap_map_get(struct swap_info_struct
*p
)
93 static inline int frontswap_store(struct page
*page
)
97 if (frontswap_enabled
)
98 ret
= __frontswap_store(page
);
102 static inline int frontswap_load(struct page
*page
)
106 if (frontswap_enabled
)
107 ret
= __frontswap_load(page
);
111 static inline void frontswap_invalidate_page(unsigned type
, pgoff_t offset
)
113 if (frontswap_enabled
)
114 __frontswap_invalidate_page(type
, offset
);
117 static inline void frontswap_invalidate_area(unsigned type
)
119 if (frontswap_enabled
)
120 __frontswap_invalidate_area(type
);
123 static inline void frontswap_init(unsigned type
)
125 if (frontswap_enabled
)
126 __frontswap_init(type
);
129 #endif /* _LINUX_FRONTSWAP_H */