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122 lines
3.0 KiB
122 lines
3.0 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#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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#include <linux/jump_label.h> |
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/* |
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* Return code to denote that requested number of |
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* frontswap pages are unused(moved to page cache). |
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* Used in shmem_unuse and try_to_unuse. |
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*/ |
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#define FRONTSWAP_PAGES_UNUSED 2 |
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struct frontswap_ops { |
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void (*init)(unsigned); /* this swap type was just swapon'ed */ |
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int (*store)(unsigned, pgoff_t, struct page *); /* store a page */ |
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int (*load)(unsigned, pgoff_t, struct page *); /* load a page */ |
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void (*invalidate_page)(unsigned, pgoff_t); /* page no longer needed */ |
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void (*invalidate_area)(unsigned); /* swap type just swapoff'ed */ |
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struct frontswap_ops *next; /* private pointer to next ops */ |
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}; |
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extern void 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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#define FRONTSWAP_HAS_EXCLUSIVE_GETS |
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extern void frontswap_tmem_exclusive_gets(bool); |
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extern bool __frontswap_test(struct swap_info_struct *, pgoff_t); |
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extern void __frontswap_init(unsigned type, unsigned long *map); |
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extern int __frontswap_store(struct page *page); |
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extern int __frontswap_load(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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extern struct static_key_false frontswap_enabled_key; |
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static inline bool frontswap_enabled(void) |
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{ |
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return static_branch_unlikely(&frontswap_enabled_key); |
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} |
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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 __frontswap_test(sis, offset); |
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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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static inline bool frontswap_enabled(void) |
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{ |
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return false; |
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} |
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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_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_store(struct page *page) |
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{ |
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if (frontswap_enabled()) |
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return __frontswap_store(page); |
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return -1; |
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} |
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static inline int frontswap_load(struct page *page) |
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{ |
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if (frontswap_enabled()) |
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return __frontswap_load(page); |
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return -1; |
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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, unsigned long *map) |
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{ |
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#ifdef CONFIG_FRONTSWAP |
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__frontswap_init(type, map); |
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#endif |
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} |
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#endif /* _LINUX_FRONTSWAP_H */
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