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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> | |
8ea1d2a1 | 7 | #include <linux/jump_label.h> |
c3ba9698 DM |
8 | |
9 | struct frontswap_ops { | |
d1dc6f1b DS |
10 | void (*init)(unsigned); /* this swap type was just swapon'ed */ |
11 | int (*store)(unsigned, pgoff_t, struct page *); /* store a page */ | |
12 | int (*load)(unsigned, pgoff_t, struct page *); /* load a page */ | |
13 | void (*invalidate_page)(unsigned, pgoff_t); /* page no longer needed */ | |
14 | void (*invalidate_area)(unsigned); /* swap type just swapoff'ed */ | |
15 | struct frontswap_ops *next; /* private pointer to next ops */ | |
c3ba9698 DM |
16 | }; |
17 | ||
d1dc6f1b | 18 | extern void frontswap_register_ops(struct frontswap_ops *ops); |
c3ba9698 DM |
19 | extern void frontswap_shrink(unsigned long); |
20 | extern unsigned long frontswap_curr_pages(void); | |
21 | extern void frontswap_writethrough(bool); | |
e3483a5f DM |
22 | #define FRONTSWAP_HAS_EXCLUSIVE_GETS |
23 | extern void frontswap_tmem_exclusive_gets(bool); | |
c3ba9698 | 24 | |
f066ea23 | 25 | extern bool __frontswap_test(struct swap_info_struct *, pgoff_t); |
4f89849d | 26 | extern void __frontswap_init(unsigned type, unsigned long *map); |
165c8aed KRW |
27 | extern int __frontswap_store(struct page *page); |
28 | extern int __frontswap_load(struct page *page); | |
c3ba9698 DM |
29 | extern void __frontswap_invalidate_page(unsigned, pgoff_t); |
30 | extern void __frontswap_invalidate_area(unsigned); | |
31 | ||
32 | #ifdef CONFIG_FRONTSWAP | |
8ea1d2a1 VB |
33 | extern struct static_key_false frontswap_enabled_key; |
34 | ||
35 | static inline bool frontswap_enabled(void) | |
36 | { | |
37 | return static_branch_unlikely(&frontswap_enabled_key); | |
38 | } | |
c3ba9698 DM |
39 | |
40 | static inline bool frontswap_test(struct swap_info_struct *sis, pgoff_t offset) | |
41 | { | |
f066ea23 | 42 | return __frontswap_test(sis, offset); |
c3ba9698 DM |
43 | } |
44 | ||
45 | static inline void frontswap_map_set(struct swap_info_struct *p, | |
46 | unsigned long *map) | |
47 | { | |
48 | p->frontswap_map = map; | |
49 | } | |
50 | ||
51 | static inline unsigned long *frontswap_map_get(struct swap_info_struct *p) | |
52 | { | |
53 | return p->frontswap_map; | |
54 | } | |
55 | #else | |
56 | /* all inline routines become no-ops and all externs are ignored */ | |
57 | ||
8ea1d2a1 VB |
58 | static inline bool frontswap_enabled(void) |
59 | { | |
60 | return false; | |
61 | } | |
c3ba9698 DM |
62 | |
63 | static inline bool frontswap_test(struct swap_info_struct *sis, pgoff_t offset) | |
64 | { | |
65 | return false; | |
66 | } | |
67 | ||
c3ba9698 DM |
68 | static inline void frontswap_map_set(struct swap_info_struct *p, |
69 | unsigned long *map) | |
70 | { | |
71 | } | |
72 | ||
73 | static inline unsigned long *frontswap_map_get(struct swap_info_struct *p) | |
74 | { | |
75 | return NULL; | |
76 | } | |
77 | #endif | |
78 | ||
165c8aed | 79 | static inline int frontswap_store(struct page *page) |
c3ba9698 | 80 | { |
8ea1d2a1 VB |
81 | if (frontswap_enabled()) |
82 | return __frontswap_store(page); | |
c3ba9698 | 83 | |
8ea1d2a1 | 84 | return -1; |
c3ba9698 DM |
85 | } |
86 | ||
165c8aed | 87 | static inline int frontswap_load(struct page *page) |
c3ba9698 | 88 | { |
8ea1d2a1 VB |
89 | if (frontswap_enabled()) |
90 | return __frontswap_load(page); | |
c3ba9698 | 91 | |
8ea1d2a1 | 92 | return -1; |
c3ba9698 DM |
93 | } |
94 | ||
95 | static inline void frontswap_invalidate_page(unsigned type, pgoff_t offset) | |
96 | { | |
8ea1d2a1 | 97 | if (frontswap_enabled()) |
c3ba9698 DM |
98 | __frontswap_invalidate_page(type, offset); |
99 | } | |
100 | ||
101 | static inline void frontswap_invalidate_area(unsigned type) | |
102 | { | |
8ea1d2a1 | 103 | if (frontswap_enabled()) |
c3ba9698 DM |
104 | __frontswap_invalidate_area(type); |
105 | } | |
106 | ||
4f89849d | 107 | static inline void frontswap_init(unsigned type, unsigned long *map) |
c3ba9698 | 108 | { |
5e322bee VB |
109 | #ifdef CONFIG_FRONTSWAP |
110 | __frontswap_init(type, map); | |
111 | #endif | |
c3ba9698 DM |
112 | } |
113 | ||
114 | #endif /* _LINUX_FRONTSWAP_H */ |