projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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> | |
| 7 | ||
| 8 | struct frontswap_ops { | |
| d1dc6f1b DS |
9 | void (*init)(unsigned); /* this swap type was just swapon'ed */ |
| 10 | int (*store)(unsigned, pgoff_t, struct page *); /* store a page */ | |
| 11 | int (*load)(unsigned, pgoff_t, struct page *); /* load a page */ | |
| 12 | void (*invalidate_page)(unsigned, pgoff_t); /* page no longer needed */ | |
| 13 | void (*invalidate_area)(unsigned); /* swap type just swapoff'ed */ | |
| 14 | struct frontswap_ops *next; /* private pointer to next ops */ | |
| c3ba9698 DM |
15 | }; |
| 16 | ||
| 17 | extern bool frontswap_enabled; | |
| 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 | |
| f066ea23 | 33 | #define frontswap_enabled (1) |
| c3ba9698 DM |
34 | |
| 35 | static inline bool frontswap_test(struct swap_info_struct *sis, pgoff_t offset) | |
| 36 | { | |
| f066ea23 | 37 | return __frontswap_test(sis, offset); |
| c3ba9698 DM |
38 | } |
| 39 | ||
| 40 | static inline void frontswap_map_set(struct swap_info_struct *p, | |
| 41 | unsigned long *map) | |
| 42 | { | |
| 43 | p->frontswap_map = map; | |
| 44 | } | |
| 45 | ||
| 46 | static inline unsigned long *frontswap_map_get(struct swap_info_struct *p) | |
| 47 | { | |
| 48 | return p->frontswap_map; | |
| 49 | } | |
| 50 | #else | |
| 51 | /* all inline routines become no-ops and all externs are ignored */ | |
| 52 | ||
| 53 | #define frontswap_enabled (0) | |
| 54 | ||
| 55 | static inline bool frontswap_test(struct swap_info_struct *sis, pgoff_t offset) | |
| 56 | { | |
| 57 | return false; | |
| 58 | } | |
| 59 | ||
| c3ba9698 DM |
60 | static inline void frontswap_map_set(struct swap_info_struct *p, |
| 61 | unsigned long *map) | |
| 62 | { | |
| 63 | } | |
| 64 | ||
| 65 | static inline unsigned long *frontswap_map_get(struct swap_info_struct *p) | |
| 66 | { | |
| 67 | return NULL; | |
| 68 | } | |
| 69 | #endif | |
| 70 | ||
| 165c8aed | 71 | static inline int frontswap_store(struct page *page) |
| c3ba9698 DM |
72 | { |
| 73 | int ret = -1; | |
| 74 | ||
| 75 | if (frontswap_enabled) | |
| 165c8aed | 76 | ret = __frontswap_store(page); |
| c3ba9698 DM |
77 | return ret; |
| 78 | } | |
| 79 | ||
| 165c8aed | 80 | static inline int frontswap_load(struct page *page) |
| c3ba9698 DM |
81 | { |
| 82 | int ret = -1; | |
| 83 | ||
| 84 | if (frontswap_enabled) | |
| 165c8aed | 85 | ret = __frontswap_load(page); |
| c3ba9698 DM |
86 | return ret; |
| 87 | } | |
| 88 | ||
| 89 | static inline void frontswap_invalidate_page(unsigned type, pgoff_t offset) | |
| 90 | { | |
| 91 | if (frontswap_enabled) | |
| 92 | __frontswap_invalidate_page(type, offset); | |
| 93 | } | |
| 94 | ||
| 95 | static inline void frontswap_invalidate_area(unsigned type) | |
| 96 | { | |
| 97 | if (frontswap_enabled) | |
| 98 | __frontswap_invalidate_area(type); | |
| 99 | } | |
| 100 | ||
| 4f89849d | 101 | static inline void frontswap_init(unsigned type, unsigned long *map) |
| c3ba9698 DM |
102 | { |
| 103 | if (frontswap_enabled) | |
| 4f89849d | 104 | __frontswap_init(type, map); |
| c3ba9698 DM |
105 | } |
| 106 | ||
| 107 | #endif /* _LINUX_FRONTSWAP_H */ |