Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
c3ba9698 DM |
2 | #ifndef _LINUX_FRONTSWAP_H |
3 | #define _LINUX_FRONTSWAP_H | |
4 | ||
5 | #include <linux/swap.h> | |
6 | #include <linux/mm.h> | |
7 | #include <linux/bitops.h> | |
8ea1d2a1 | 8 | #include <linux/jump_label.h> |
c3ba9698 DM |
9 | |
10 | struct frontswap_ops { | |
d1dc6f1b DS |
11 | void (*init)(unsigned); /* this swap type was just swapon'ed */ |
12 | int (*store)(unsigned, pgoff_t, struct page *); /* store a page */ | |
13 | int (*load)(unsigned, pgoff_t, struct page *); /* load a page */ | |
14 | void (*invalidate_page)(unsigned, pgoff_t); /* page no longer needed */ | |
15 | void (*invalidate_area)(unsigned); /* swap type just swapoff'ed */ | |
16 | struct frontswap_ops *next; /* private pointer to next ops */ | |
c3ba9698 DM |
17 | }; |
18 | ||
d1dc6f1b | 19 | extern void frontswap_register_ops(struct frontswap_ops *ops); |
c3ba9698 DM |
20 | extern void frontswap_shrink(unsigned long); |
21 | extern unsigned long frontswap_curr_pages(void); | |
22 | extern void frontswap_writethrough(bool); | |
e3483a5f DM |
23 | #define FRONTSWAP_HAS_EXCLUSIVE_GETS |
24 | extern void frontswap_tmem_exclusive_gets(bool); | |
c3ba9698 | 25 | |
f066ea23 | 26 | extern bool __frontswap_test(struct swap_info_struct *, pgoff_t); |
4f89849d | 27 | extern void __frontswap_init(unsigned type, unsigned long *map); |
165c8aed KRW |
28 | extern int __frontswap_store(struct page *page); |
29 | extern int __frontswap_load(struct page *page); | |
c3ba9698 DM |
30 | extern void __frontswap_invalidate_page(unsigned, pgoff_t); |
31 | extern void __frontswap_invalidate_area(unsigned); | |
32 | ||
33 | #ifdef CONFIG_FRONTSWAP | |
8ea1d2a1 VB |
34 | extern struct static_key_false frontswap_enabled_key; |
35 | ||
36 | static inline bool frontswap_enabled(void) | |
37 | { | |
38 | return static_branch_unlikely(&frontswap_enabled_key); | |
39 | } | |
c3ba9698 DM |
40 | |
41 | static inline bool frontswap_test(struct swap_info_struct *sis, pgoff_t offset) | |
42 | { | |
f066ea23 | 43 | return __frontswap_test(sis, offset); |
c3ba9698 DM |
44 | } |
45 | ||
46 | static inline void frontswap_map_set(struct swap_info_struct *p, | |
47 | unsigned long *map) | |
48 | { | |
49 | p->frontswap_map = map; | |
50 | } | |
51 | ||
52 | static inline unsigned long *frontswap_map_get(struct swap_info_struct *p) | |
53 | { | |
54 | return p->frontswap_map; | |
55 | } | |
56 | #else | |
57 | /* all inline routines become no-ops and all externs are ignored */ | |
58 | ||
8ea1d2a1 VB |
59 | static inline bool frontswap_enabled(void) |
60 | { | |
61 | return false; | |
62 | } | |
c3ba9698 DM |
63 | |
64 | static inline bool frontswap_test(struct swap_info_struct *sis, pgoff_t offset) | |
65 | { | |
66 | return false; | |
67 | } | |
68 | ||
c3ba9698 DM |
69 | static inline void frontswap_map_set(struct swap_info_struct *p, |
70 | unsigned long *map) | |
71 | { | |
72 | } | |
73 | ||
74 | static inline unsigned long *frontswap_map_get(struct swap_info_struct *p) | |
75 | { | |
76 | return NULL; | |
77 | } | |
78 | #endif | |
79 | ||
165c8aed | 80 | static inline int frontswap_store(struct page *page) |
c3ba9698 | 81 | { |
8ea1d2a1 VB |
82 | if (frontswap_enabled()) |
83 | return __frontswap_store(page); | |
c3ba9698 | 84 | |
8ea1d2a1 | 85 | return -1; |
c3ba9698 DM |
86 | } |
87 | ||
165c8aed | 88 | static inline int frontswap_load(struct page *page) |
c3ba9698 | 89 | { |
8ea1d2a1 VB |
90 | if (frontswap_enabled()) |
91 | return __frontswap_load(page); | |
c3ba9698 | 92 | |
8ea1d2a1 | 93 | return -1; |
c3ba9698 DM |
94 | } |
95 | ||
96 | static inline void frontswap_invalidate_page(unsigned type, pgoff_t offset) | |
97 | { | |
8ea1d2a1 | 98 | if (frontswap_enabled()) |
c3ba9698 DM |
99 | __frontswap_invalidate_page(type, offset); |
100 | } | |
101 | ||
102 | static inline void frontswap_invalidate_area(unsigned type) | |
103 | { | |
8ea1d2a1 | 104 | if (frontswap_enabled()) |
c3ba9698 DM |
105 | __frontswap_invalidate_area(type); |
106 | } | |
107 | ||
4f89849d | 108 | static inline void frontswap_init(unsigned type, unsigned long *map) |
c3ba9698 | 109 | { |
5e322bee VB |
110 | #ifdef CONFIG_FRONTSWAP |
111 | __frontswap_init(type, map); | |
112 | #endif | |
c3ba9698 DM |
113 | } |
114 | ||
115 | #endif /* _LINUX_FRONTSWAP_H */ |