| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #ifndef _LINUX_ZSWAP_H |
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| 3 | #define _LINUX_ZSWAP_H |
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| 4 | |
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| 5 | #include <linux/types.h> |
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| 6 | #include <linux/mm_types.h> |
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| 7 | |
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| 8 | struct lruvec; |
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| 9 | |
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| 10 | extern atomic_long_t zswap_stored_pages; |
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| 11 | |
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| 12 | #ifdef CONFIG_ZSWAP |
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| 13 | |
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| 14 | struct zswap_lruvec_state { |
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| 15 | /* |
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| 16 | * Number of swapped in pages from disk, i.e not found in the zswap pool. |
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| 17 | * |
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| 18 | * This is consumed and subtracted from the lru size in |
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| 19 | * zswap_shrinker_count() to penalize past overshrinking that led to disk |
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| 20 | * swapins. The idea is that had we considered this many more pages in the |
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| 21 | * LRU active/protected and not written them back, we would not have had to |
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| 22 | * swapped them in. |
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| 23 | */ |
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| 24 | atomic_long_t nr_disk_swapins; |
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| 25 | }; |
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| 26 | |
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| 27 | unsigned long zswap_total_pages(void); |
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| 28 | bool zswap_store(struct folio *folio); |
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| 29 | int zswap_load(struct folio *folio); |
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| 30 | void zswap_invalidate(swp_entry_t swp); |
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| 31 | int zswap_swapon(int type, unsigned long nr_pages); |
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| 32 | void zswap_swapoff(int type); |
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| 33 | void zswap_memcg_offline_cleanup(struct mem_cgroup *memcg); |
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| 34 | void zswap_lruvec_state_init(struct lruvec *lruvec); |
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| 35 | void zswap_folio_swapin(struct folio *folio); |
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| 36 | bool zswap_is_enabled(void); |
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| 37 | bool zswap_never_enabled(void); |
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| 38 | #else |
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| 39 | |
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| 40 | struct zswap_lruvec_state {}; |
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| 41 | |
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| 42 | static inline bool zswap_store(struct folio *folio) |
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| 43 | { |
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| 44 | return false; |
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| 45 | } |
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| 46 | |
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| 47 | static inline int zswap_load(struct folio *folio) |
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| 48 | { |
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| 49 | return -ENOENT; |
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| 50 | } |
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| 51 | |
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| 52 | static inline void zswap_invalidate(swp_entry_t swp) {} |
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| 53 | static inline int zswap_swapon(int type, unsigned long nr_pages) |
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| 54 | { |
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| 55 | return 0; |
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| 56 | } |
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| 57 | static inline void zswap_swapoff(int type) {} |
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| 58 | static inline void zswap_memcg_offline_cleanup(struct mem_cgroup *memcg) {} |
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| 59 | static inline void zswap_lruvec_state_init(struct lruvec *lruvec) {} |
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| 60 | static inline void zswap_folio_swapin(struct folio *folio) {} |
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| 61 | |
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| 62 | static inline bool zswap_is_enabled(void) |
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| 63 | { |
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| 64 | return false; |
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| 65 | } |
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| 66 | |
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| 67 | static inline bool zswap_never_enabled(void) |
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| 68 | { |
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| 69 | return true; |
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| 70 | } |
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| 71 | |
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| 72 | #endif |
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| 73 | |
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| 74 | #endif /* _LINUX_ZSWAP_H */ |
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| 75 | |
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