128 lines
2.9 KiB
C
128 lines
2.9 KiB
C
![]() |
#ifndef _LINUX_FRONTSWAP_H
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#define _LINUX_FRONTSWAP_H
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#include <linux/swap.h>
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#include <linux/mm.h>
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#include <linux/bitops.h>
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struct frontswap_ops {
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void (*init)(unsigned);
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int (*put_page)(unsigned, pgoff_t, struct page *);
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int (*get_page)(unsigned, pgoff_t, struct page *);
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void (*invalidate_page)(unsigned, pgoff_t);
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void (*invalidate_area)(unsigned);
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};
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extern bool frontswap_enabled;
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extern struct frontswap_ops
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frontswap_register_ops(struct frontswap_ops *ops);
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extern void frontswap_shrink(unsigned long);
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extern unsigned long frontswap_curr_pages(void);
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extern void frontswap_writethrough(bool);
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extern void __frontswap_init(unsigned type);
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extern int __frontswap_put_page(struct page *page);
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extern int __frontswap_get_page(struct page *page);
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extern void __frontswap_invalidate_page(unsigned, pgoff_t);
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extern void __frontswap_invalidate_area(unsigned);
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#ifdef CONFIG_FRONTSWAP
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static inline bool frontswap_test(struct swap_info_struct *sis, pgoff_t offset)
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{
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bool ret = false;
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if (frontswap_enabled && sis->frontswap_map)
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ret = test_bit(offset, sis->frontswap_map);
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return ret;
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}
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static inline void frontswap_set(struct swap_info_struct *sis, pgoff_t offset)
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{
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if (frontswap_enabled && sis->frontswap_map)
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set_bit(offset, sis->frontswap_map);
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}
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static inline void frontswap_clear(struct swap_info_struct *sis, pgoff_t offset)
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{
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if (frontswap_enabled && sis->frontswap_map)
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clear_bit(offset, sis->frontswap_map);
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}
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static inline void frontswap_map_set(struct swap_info_struct *p,
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unsigned long *map)
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{
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p->frontswap_map = map;
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}
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static inline unsigned long *frontswap_map_get(struct swap_info_struct *p)
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{
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return p->frontswap_map;
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}
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#else
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/* all inline routines become no-ops and all externs are ignored */
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#define frontswap_enabled (0)
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static inline bool frontswap_test(struct swap_info_struct *sis, pgoff_t offset)
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{
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return false;
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}
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static inline void frontswap_set(struct swap_info_struct *sis, pgoff_t offset)
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{
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}
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static inline void frontswap_clear(struct swap_info_struct *sis, pgoff_t offset)
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{
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}
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static inline void frontswap_map_set(struct swap_info_struct *p,
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unsigned long *map)
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{
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}
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static inline unsigned long *frontswap_map_get(struct swap_info_struct *p)
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{
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return NULL;
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}
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#endif
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static inline int frontswap_put_page(struct page *page)
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{
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int ret = -1;
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if (frontswap_enabled)
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ret = __frontswap_put_page(page);
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return ret;
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}
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static inline int frontswap_get_page(struct page *page)
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{
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int ret = -1;
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if (frontswap_enabled)
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ret = __frontswap_get_page(page);
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return ret;
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}
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static inline void frontswap_invalidate_page(unsigned type, pgoff_t offset)
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{
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if (frontswap_enabled)
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__frontswap_invalidate_page(type, offset);
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}
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static inline void frontswap_invalidate_area(unsigned type)
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{
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if (frontswap_enabled)
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__frontswap_invalidate_area(type);
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}
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static inline void frontswap_init(unsigned type)
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{
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if (frontswap_enabled)
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__frontswap_init(type);
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}
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#endif /* _LINUX_FRONTSWAP_H */
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