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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 *); | |
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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); | |
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22 | #define FRONTSWAP_HAS_EXCLUSIVE_GETS |
23 | extern void frontswap_tmem_exclusive_gets(bool); | |
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24 | |
25 | extern void __frontswap_init(unsigned type); | |
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26 | extern int __frontswap_store(struct page *page); |
27 | extern int __frontswap_load(struct page *page); | |
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28 | extern void __frontswap_invalidate_page(unsigned, pgoff_t); |
29 | extern void __frontswap_invalidate_area(unsigned); | |
30 | ||
31 | #ifdef CONFIG_FRONTSWAP | |
32 | ||
33 | static inline bool frontswap_test(struct swap_info_struct *sis, pgoff_t offset) | |
34 | { | |
35 | bool ret = false; | |
36 | ||
37 | if (frontswap_enabled && sis->frontswap_map) | |
38 | ret = test_bit(offset, sis->frontswap_map); | |
39 | return ret; | |
40 | } | |
41 | ||
42 | static inline void frontswap_set(struct swap_info_struct *sis, pgoff_t offset) | |
43 | { | |
44 | if (frontswap_enabled && sis->frontswap_map) | |
45 | set_bit(offset, sis->frontswap_map); | |
46 | } | |
47 | ||
48 | static inline void frontswap_clear(struct swap_info_struct *sis, pgoff_t offset) | |
49 | { | |
50 | if (frontswap_enabled && sis->frontswap_map) | |
51 | clear_bit(offset, sis->frontswap_map); | |
52 | } | |
53 | ||
54 | static inline void frontswap_map_set(struct swap_info_struct *p, | |
55 | unsigned long *map) | |
56 | { | |
57 | p->frontswap_map = map; | |
58 | } | |
59 | ||
60 | static inline unsigned long *frontswap_map_get(struct swap_info_struct *p) | |
61 | { | |
62 | return p->frontswap_map; | |
63 | } | |
64 | #else | |
65 | /* all inline routines become no-ops and all externs are ignored */ | |
66 | ||
67 | #define frontswap_enabled (0) | |
68 | ||
69 | static inline bool frontswap_test(struct swap_info_struct *sis, pgoff_t offset) | |
70 | { | |
71 | return false; | |
72 | } | |
73 | ||
74 | static inline void frontswap_set(struct swap_info_struct *sis, pgoff_t offset) | |
75 | { | |
76 | } | |
77 | ||
78 | static inline void frontswap_clear(struct swap_info_struct *sis, pgoff_t offset) | |
79 | { | |
80 | } | |
81 | ||
82 | static inline void frontswap_map_set(struct swap_info_struct *p, | |
83 | unsigned long *map) | |
84 | { | |
85 | } | |
86 | ||
87 | static inline unsigned long *frontswap_map_get(struct swap_info_struct *p) | |
88 | { | |
89 | return NULL; | |
90 | } | |
91 | #endif | |
92 | ||
165c8aed | 93 | static inline int frontswap_store(struct page *page) |
c3ba9698 DM |
94 | { |
95 | int ret = -1; | |
96 | ||
97 | if (frontswap_enabled) | |
165c8aed | 98 | ret = __frontswap_store(page); |
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99 | return ret; |
100 | } | |
101 | ||
165c8aed | 102 | static inline int frontswap_load(struct page *page) |
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103 | { |
104 | int ret = -1; | |
105 | ||
106 | if (frontswap_enabled) | |
165c8aed | 107 | ret = __frontswap_load(page); |
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108 | return ret; |
109 | } | |
110 | ||
111 | static inline void frontswap_invalidate_page(unsigned type, pgoff_t offset) | |
112 | { | |
113 | if (frontswap_enabled) | |
114 | __frontswap_invalidate_page(type, offset); | |
115 | } | |
116 | ||
117 | static inline void frontswap_invalidate_area(unsigned type) | |
118 | { | |
119 | if (frontswap_enabled) | |
120 | __frontswap_invalidate_area(type); | |
121 | } | |
122 | ||
123 | static inline void frontswap_init(unsigned type) | |
124 | { | |
125 | if (frontswap_enabled) | |
126 | __frontswap_init(type); | |
127 | } | |
128 | ||
129 | #endif /* _LINUX_FRONTSWAP_H */ |