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c3ba9698 DM |
1 | #ifndef _LINUX_FRONTSWAP_H |
2 | #define _LINUX_FRONTSWAP_H | |
3 | ||
4 | #include <linux/swap.h> | |
5 | #include <linux/mm.h> | |
6 | #include <linux/bitops.h> | |
7 | ||
8 | struct frontswap_ops { | |
9 | void (*init)(unsigned); | |
165c8aed KRW |
10 | int (*store)(unsigned, pgoff_t, struct page *); |
11 | int (*load)(unsigned, pgoff_t, struct page *); | |
c3ba9698 DM |
12 | void (*invalidate_page)(unsigned, pgoff_t); |
13 | void (*invalidate_area)(unsigned); | |
14 | }; | |
15 | ||
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 | ||
23 | extern void __frontswap_init(unsigned type); | |
165c8aed KRW |
24 | extern int __frontswap_store(struct page *page); |
25 | extern int __frontswap_load(struct page *page); | |
c3ba9698 DM |
26 | extern void __frontswap_invalidate_page(unsigned, pgoff_t); |
27 | extern void __frontswap_invalidate_area(unsigned); | |
28 | ||
29 | #ifdef CONFIG_FRONTSWAP | |
30 | ||
31 | static inline bool frontswap_test(struct swap_info_struct *sis, pgoff_t offset) | |
32 | { | |
33 | bool ret = false; | |
34 | ||
35 | if (frontswap_enabled && sis->frontswap_map) | |
36 | ret = test_bit(offset, sis->frontswap_map); | |
37 | return ret; | |
38 | } | |
39 | ||
40 | static inline void frontswap_set(struct swap_info_struct *sis, pgoff_t offset) | |
41 | { | |
42 | if (frontswap_enabled && sis->frontswap_map) | |
43 | set_bit(offset, sis->frontswap_map); | |
44 | } | |
45 | ||
46 | static inline void frontswap_clear(struct swap_info_struct *sis, pgoff_t offset) | |
47 | { | |
48 | if (frontswap_enabled && sis->frontswap_map) | |
49 | clear_bit(offset, sis->frontswap_map); | |
50 | } | |
51 | ||
52 | static inline void frontswap_map_set(struct swap_info_struct *p, | |
53 | unsigned long *map) | |
54 | { | |
55 | p->frontswap_map = map; | |
56 | } | |
57 | ||
58 | static inline unsigned long *frontswap_map_get(struct swap_info_struct *p) | |
59 | { | |
60 | return p->frontswap_map; | |
61 | } | |
62 | #else | |
63 | /* all inline routines become no-ops and all externs are ignored */ | |
64 | ||
65 | #define frontswap_enabled (0) | |
66 | ||
67 | static inline bool frontswap_test(struct swap_info_struct *sis, pgoff_t offset) | |
68 | { | |
69 | return false; | |
70 | } | |
71 | ||
72 | static inline void frontswap_set(struct swap_info_struct *sis, pgoff_t offset) | |
73 | { | |
74 | } | |
75 | ||
76 | static inline void frontswap_clear(struct swap_info_struct *sis, pgoff_t offset) | |
77 | { | |
78 | } | |
79 | ||
80 | static inline void frontswap_map_set(struct swap_info_struct *p, | |
81 | unsigned long *map) | |
82 | { | |
83 | } | |
84 | ||
85 | static inline unsigned long *frontswap_map_get(struct swap_info_struct *p) | |
86 | { | |
87 | return NULL; | |
88 | } | |
89 | #endif | |
90 | ||
165c8aed | 91 | static inline int frontswap_store(struct page *page) |
c3ba9698 DM |
92 | { |
93 | int ret = -1; | |
94 | ||
95 | if (frontswap_enabled) | |
165c8aed | 96 | ret = __frontswap_store(page); |
c3ba9698 DM |
97 | return ret; |
98 | } | |
99 | ||
165c8aed | 100 | static inline int frontswap_load(struct page *page) |
c3ba9698 DM |
101 | { |
102 | int ret = -1; | |
103 | ||
104 | if (frontswap_enabled) | |
165c8aed | 105 | ret = __frontswap_load(page); |
c3ba9698 DM |
106 | return ret; |
107 | } | |
108 | ||
109 | static inline void frontswap_invalidate_page(unsigned type, pgoff_t offset) | |
110 | { | |
111 | if (frontswap_enabled) | |
112 | __frontswap_invalidate_page(type, offset); | |
113 | } | |
114 | ||
115 | static inline void frontswap_invalidate_area(unsigned type) | |
116 | { | |
117 | if (frontswap_enabled) | |
118 | __frontswap_invalidate_area(type); | |
119 | } | |
120 | ||
121 | static inline void frontswap_init(unsigned type) | |
122 | { | |
123 | if (frontswap_enabled) | |
124 | __frontswap_init(type); | |
125 | } | |
126 | ||
127 | #endif /* _LINUX_FRONTSWAP_H */ |