| | 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 | #include <linux/jump_label.h> |
| | 8 | |
| | 9 | struct frontswap_ops { |
| | 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 */ |
| | 16 | }; |
| | 17 | |
| | 18 | extern void 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 | #define FRONTSWAP_HAS_EXCLUSIVE_GETS |
| | 23 | extern void frontswap_tmem_exclusive_gets(bool); |
| | 24 | |
| | 25 | extern bool __frontswap_test(struct swap_info_struct *, pgoff_t); |
| | 26 | extern void __frontswap_init(unsigned type, unsigned long *map); |
| | 27 | extern int __frontswap_store(struct page *page); |
| | 28 | extern int __frontswap_load(struct page *page); |
| | 29 | extern void __frontswap_invalidate_page(unsigned, pgoff_t); |
| | 30 | extern void __frontswap_invalidate_area(unsigned); |
| | 31 | |
| | 32 | #ifdef CONFIG_FRONTSWAP |
| | 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 | } |
| | 39 | |
| | 40 | static inline bool frontswap_test(struct swap_info_struct *sis, pgoff_t offset) |
| | 41 | { |
| | 42 | return __frontswap_test(sis, offset); |
| | 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 | |
| | 58 | static inline bool frontswap_enabled(void) |
| | 59 | { |
| | 60 | return false; |
| | 61 | } |
| | 62 | |
| | 63 | static inline bool frontswap_test(struct swap_info_struct *sis, pgoff_t offset) |
| | 64 | { |
| | 65 | return false; |
| | 66 | } |
| | 67 | |
| | 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 | |
| | 79 | static inline int frontswap_store(struct page *page) |
| | 80 | { |
| | 81 | if (frontswap_enabled()) |
| | 82 | return __frontswap_store(page); |
| | 83 | |
| | 84 | return -1; |
| | 85 | } |
| | 86 | |
| | 87 | static inline int frontswap_load(struct page *page) |
| | 88 | { |
| | 89 | if (frontswap_enabled()) |
| | 90 | return __frontswap_load(page); |
| | 91 | |
| | 92 | return -1; |
| | 93 | } |
| | 94 | |
| | 95 | static inline void frontswap_invalidate_page(unsigned type, pgoff_t offset) |
| | 96 | { |
| | 97 | if (frontswap_enabled()) |
| | 98 | __frontswap_invalidate_page(type, offset); |
| | 99 | } |
| | 100 | |
| | 101 | static inline void frontswap_invalidate_area(unsigned type) |
| | 102 | { |
| | 103 | if (frontswap_enabled()) |
| | 104 | __frontswap_invalidate_area(type); |
| | 105 | } |
| | 106 | |
| | 107 | static inline void frontswap_init(unsigned type, unsigned long *map) |
| | 108 | { |
| | 109 | #ifdef CONFIG_FRONTSWAP |
| | 110 | __frontswap_init(type, map); |
| | 111 | #endif |
| | 112 | } |
| | 113 | |
| | 114 | #endif /* _LINUX_FRONTSWAP_H */ |
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