Commit | Line | Data |
---|---|---|
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 */ | |
c3ba9698 DM |
16 | }; |
17 | ||
1da0d94a | 18 | int frontswap_register_ops(const struct frontswap_ops *ops); |
c3ba9698 | 19 | |
1cf53c89 | 20 | extern void frontswap_init(unsigned type, unsigned long *map); |
165c8aed KRW |
21 | extern int __frontswap_store(struct page *page); |
22 | extern int __frontswap_load(struct page *page); | |
c3ba9698 DM |
23 | extern void __frontswap_invalidate_page(unsigned, pgoff_t); |
24 | extern void __frontswap_invalidate_area(unsigned); | |
25 | ||
26 | #ifdef CONFIG_FRONTSWAP | |
8ea1d2a1 VB |
27 | extern struct static_key_false frontswap_enabled_key; |
28 | ||
29 | static inline bool frontswap_enabled(void) | |
30 | { | |
31 | return static_branch_unlikely(&frontswap_enabled_key); | |
32 | } | |
c3ba9698 | 33 | |
c3ba9698 DM |
34 | static inline void frontswap_map_set(struct swap_info_struct *p, |
35 | unsigned long *map) | |
36 | { | |
37 | p->frontswap_map = map; | |
38 | } | |
39 | ||
40 | static inline unsigned long *frontswap_map_get(struct swap_info_struct *p) | |
41 | { | |
42 | return p->frontswap_map; | |
43 | } | |
44 | #else | |
45 | /* all inline routines become no-ops and all externs are ignored */ | |
46 | ||
8ea1d2a1 VB |
47 | static inline bool frontswap_enabled(void) |
48 | { | |
49 | return false; | |
50 | } | |
c3ba9698 | 51 | |
c3ba9698 DM |
52 | static inline void frontswap_map_set(struct swap_info_struct *p, |
53 | unsigned long *map) | |
54 | { | |
55 | } | |
56 | ||
57 | static inline unsigned long *frontswap_map_get(struct swap_info_struct *p) | |
58 | { | |
59 | return NULL; | |
60 | } | |
61 | #endif | |
62 | ||
165c8aed | 63 | static inline int frontswap_store(struct page *page) |
c3ba9698 | 64 | { |
8ea1d2a1 VB |
65 | if (frontswap_enabled()) |
66 | return __frontswap_store(page); | |
c3ba9698 | 67 | |
8ea1d2a1 | 68 | return -1; |
c3ba9698 DM |
69 | } |
70 | ||
165c8aed | 71 | static inline int frontswap_load(struct page *page) |
c3ba9698 | 72 | { |
8ea1d2a1 VB |
73 | if (frontswap_enabled()) |
74 | return __frontswap_load(page); | |
c3ba9698 | 75 | |
8ea1d2a1 | 76 | return -1; |
c3ba9698 DM |
77 | } |
78 | ||
79 | static inline void frontswap_invalidate_page(unsigned type, pgoff_t offset) | |
80 | { | |
8ea1d2a1 | 81 | if (frontswap_enabled()) |
c3ba9698 DM |
82 | __frontswap_invalidate_page(type, offset); |
83 | } | |
84 | ||
85 | static inline void frontswap_invalidate_area(unsigned type) | |
86 | { | |
8ea1d2a1 | 87 | if (frontswap_enabled()) |
c3ba9698 DM |
88 | __frontswap_invalidate_area(type); |
89 | } | |
90 | ||
c3ba9698 | 91 | #endif /* _LINUX_FRONTSWAP_H */ |