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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_ZSWAP_H
#define _LINUX_ZSWAP_H
#include <linux/types.h>
#include <linux/mm_types.h>
struct lruvec;
extern atomic_t zswap_stored_pages;
#ifdef CONFIG_ZSWAP
struct zswap_lruvec_state {
/*
* Number of pages in zswap that should be protected from the shrinker.
* This number is an estimate of the following counts:
*
* a) Recent page faults.
* b) Recent insertion to the zswap LRU. This includes new zswap stores,
* as well as recent zswap LRU rotations.
*
* These pages are likely to be warm, and might incur IO if the are written
* to swap.
*/
atomic_long_t nr_zswap_protected;
};
unsigned long zswap_total_pages(void);
bool zswap_store(struct folio *folio);
bool zswap_load(struct folio *folio);
void zswap_invalidate(swp_entry_t swp);
int zswap_swapon(int type, unsigned long nr_pages);
void zswap_swapoff(int type);
void zswap_memcg_offline_cleanup(struct mem_cgroup *memcg);
void zswap_lruvec_state_init(struct lruvec *lruvec);
void zswap_folio_swapin(struct folio *folio);
bool zswap_is_enabled(void);
bool zswap_never_enabled(void);
#else
struct zswap_lruvec_state {};
static inline bool zswap_store(struct folio *folio)
{
return false;
}
static inline bool zswap_load(struct folio *folio)
{
return false;
}
static inline void zswap_invalidate(swp_entry_t swp) {}
static inline int zswap_swapon(int type, unsigned long nr_pages)
{
return 0;
}
static inline void zswap_swapoff(int type) {}
static inline void zswap_memcg_offline_cleanup(struct mem_cgroup *memcg) {}
static inline void zswap_lruvec_state_init(struct lruvec *lruvec) {}
static inline void zswap_folio_swapin(struct folio *folio) {}
static inline bool zswap_is_enabled(void)
{
return false;
}
static inline bool zswap_never_enabled(void)
{
return true;
}
#endif
#endif /* _LINUX_ZSWAP_H */
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