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#ifndef _LINUX_SWAP_H

#define _LINUX_SWAP_H

#define SWAP_FLAG_PREFER        0x8000  /* set if swap priority specified */

#define SWAP_FLAG_PRIO_MASK     0x7fff

#define SWAP_FLAG_PRIO_SHIFT    0

#define MAX_SWAPFILES 8

#ifdef __KERNEL__

#include <asm/atomic.h>

#define SWP_USED        1

#define SWP_WRITEOK     3

#define SWAP_CLUSTER_MAX 32

#define SWAP_MAP_MAX      0xfffe        /* max val of swapinfo->swap_map[n] */

#define SWAP_MAP_RESERVED 0xffff        /* max val of swapinfo->swap_map[n] */

#ifndef NO_MM

struct swap_info_struct {

        unsigned int flags;

        kdev_t swap_device;

        struct inode * swap_file;

        unsigned short * swap_map;

        unsigned char * swap_lockmap;

        int lowest_bit;

        int highest_bit;

        int cluster_next;

        int cluster_nr;

        int prio;                       /* swap priority */

        int pages;

        unsigned long max;

        int next;                       /* next entry on swap list */

};

#endif /* !NO_MM */

extern int nr_swap_pages;

extern int nr_free_pages;

extern atomic_t nr_async_pages;

extern int min_free_pages;

extern int free_pages_low;

extern int free_pages_high;

/* Incomplete types for prototype declarations: */

struct task_struct;

struct vm_area_struct;

struct sysinfo;

/* linux/ipc/shm.c */

extern int shm_swap (int, int);

/* linux/mm/vmscan.c */

extern int try_to_free_page(int, int, int);

/* linux/mm/page_io.c */

extern void rw_swap_page(int, unsigned long, char *, int);

#define read_swap_page(nr,buf) \

        rw_swap_page(READ,(nr),(buf),1)

#define write_swap_page(nr,buf) \

        rw_swap_page(WRITE,(nr),(buf),1)

extern void swap_after_unlock_page (unsigned long entry);

/* linux/mm/page_alloc.c */

#ifndef NO_MM

extern void swap_in(struct task_struct *, struct vm_area_struct *,

                    pte_t *, unsigned long, int);

#endif /* !NO_MM */

/* linux/mm/swap_state.c */

extern void show_swap_cache_info(void);

extern int add_to_swap_cache(unsigned long, unsigned long);

extern unsigned long init_swap_cache(unsigned long, unsigned long);

extern void swap_duplicate(unsigned long);

/* linux/mm/swapfile.c */

void si_swapinfo(struct sysinfo *);

#ifndef NO_MM

extern int nr_swapfiles;

extern struct swap_info_struct swap_info[];

unsigned long get_swap_page(void);

extern void swap_free(unsigned long);

/*

 * vm_ops not present page codes for shared memory.

 *

 * Will go away eventually..

 */

#define SHM_SWP_TYPE 0x40

/*

 * swap cache stuff (in linux/mm/swap_state.c)

 */

#define SWAP_CACHE_INFO

extern unsigned long * swap_cache;

#ifdef SWAP_CACHE_INFO

extern unsigned long swap_cache_add_total;

extern unsigned long swap_cache_add_success;

extern unsigned long swap_cache_del_total;

extern unsigned long swap_cache_del_success;

extern unsigned long swap_cache_find_total;

extern unsigned long swap_cache_find_success;

#endif

extern inline unsigned long in_swap_cache(unsigned long index)

{

        return swap_cache[index];

}

extern inline long find_in_swap_cache(unsigned long index)

{

        unsigned long entry;

#ifdef SWAP_CACHE_INFO

        swap_cache_find_total++;

#endif

        entry = xchg(swap_cache + index, 0);

#ifdef SWAP_CACHE_INFO

        if (entry)

                swap_cache_find_success++;

#endif  

        return entry;

}

extern inline int delete_from_swap_cache(unsigned long index)

{

        unsigned long entry;

#ifdef SWAP_CACHE_INFO

        swap_cache_del_total++;

#endif  

        entry = xchg(swap_cache + index, 0);

        if (entry)  {

#ifdef SWAP_CACHE_INFO

                swap_cache_del_success++;

#endif

                swap_free(entry);

                return 1;

        }

        return 0;

}

#endif /* !NO_MM */

#endif /* __KERNEL__*/

#endif /* _LINUX_SWAP_H */