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#ifndef _LINUX_SWAP_H
#define _LINUX_SWAP_H

#include <linux/config.h>
#include <linux/spinlock.h>
#include <linux/linkage.h>
#include <linux/mmzone.h>
#include <linux/list.h>
#include <linux/sched.h>
#include <asm/atomic.h>
#include <asm/page.h>

#define SWAP_FLAG_PREFER        0x8000  /* set if swap priority specified */
#define SWAP_FLAG_PRIO_MASK     0x7fff
#define SWAP_FLAG_PRIO_SHIFT    0

static inline int current_is_kswapd(void)
{
        return current->flags & PF_KSWAPD;
}

/*
 * MAX_SWAPFILES defines the maximum number of swaptypes: things which can
 * be swapped to.  The swap type and the offset into that swap type are
 * encoded into pte's and into pgoff_t's in the swapcache.  Using five bits
 * for the type means that the maximum number of swapcache pages is 27 bits
 * on 32-bit-pgoff_t architectures.  And that assumes that the architecture packs
 * the type/offset into the pte as 5/27 as well.
 */
#define MAX_SWAPFILES_SHIFT     5
#define MAX_SWAPFILES           (1 << MAX_SWAPFILES_SHIFT)

/*
 * Magic header for a swap area. The first part of the union is
 * what the swap magic looks like for the old (limited to 128MB)
 * swap area format, the second part of the union adds - in the
 * old reserved area - some extra information. Note that the first
 * kilobyte is reserved for boot loader or disk label stuff...
 *
 * Having the magic at the end of the PAGE_SIZE makes detecting swap
 * areas somewhat tricky on machines that support multiple page sizes.
 * For 2.5 we'll probably want to move the magic to just beyond the
 * bootbits...
 */
union swap_header {
        struct {
                char reserved[PAGE_SIZE - 10];
                char magic[10];                 /* SWAP-SPACE or SWAPSPACE2 */
        } magic;
        struct {
                char         bootbits[1024];    /* Space for disklabel etc. */
                unsigned int version;
                unsigned int last_page;
                unsigned int nr_badpages;
                unsigned int padding[125];
                unsigned int badpages[1];
        } info;
};

 /* A swap entry has to fit into a "unsigned long", as
  * the entry is hidden in the "index" field of the
  * swapper address space.
  */
typedef struct {
        unsigned long val;
} swp_entry_t;

/*
 * current->reclaim_state points to one of these when a task is running
 * memory reclaim
 */
struct reclaim_state {
        unsigned long reclaimed_slab;
};

#ifdef __KERNEL__

struct address_space;
struct pte_chain;
struct sysinfo;
struct writeback_control;
struct zone;

/*
 * A swap extent maps a range of a swapfile's PAGE_SIZE pages onto a range of
 * disk blocks.  A list of swap extents maps the entire swapfile.  (Where the
 * term `swapfile' refers to either a blockdevice or an IS_REG file.  Apart
 * from setup, they're handled identically.
 *
 * We always assume that blocks are of size PAGE_SIZE.
 */
struct swap_extent {
        struct list_head list;
        pgoff_t start_page;
        pgoff_t nr_pages;
        sector_t start_block;
};

/*
 * Max bad pages in the new format..
 */
#define __swapoffset(x) ((unsigned long)&((union swap_header *)0)->x)
#define MAX_SWAP_BADPAGES \
        ((__swapoffset(magic.magic) - __swapoffset(info.badpages)) / sizeof(int))

enum {
        SWP_USED        = (1 << 0),     /* is slot in swap_info[] used? */
        SWP_WRITEOK     = (1 << 1),     /* ok to write to this swap?    */
        SWP_ACTIVE      = (SWP_USED | SWP_WRITEOK),
};

#define SWAP_CLUSTER_MAX 32

#define SWAP_MAP_MAX    0x7fff
#define SWAP_MAP_BAD    0x8000

/*
 * The in-memory structure used to track swap areas.
 * extent_list.prev points at the lowest-index extent.  That list is
 * sorted.
 */
struct swap_info_struct {
        unsigned int flags;
        spinlock_t sdev_lock;
        struct file *swap_file;
        struct block_device *bdev;
        struct list_head extent_list;
        int nr_extents;
        struct swap_extent *curr_swap_extent;
        unsigned old_block_size;
        unsigned short * swap_map;
        unsigned int lowest_bit;
        unsigned int highest_bit;
        unsigned int cluster_next;
        unsigned int cluster_nr;
        int prio;                       /* swap priority */
        int pages;
        unsigned long max;
        unsigned long inuse_pages;
        int next;                       /* next entry on swap list */
};

struct swap_list_t {
        int head;       /* head of priority-ordered swapfile list */
        int next;       /* swapfile to be used next */
};

/* Swap 50% full? Release swapcache more aggressively.. */
#define vm_swap_full() (nr_swap_pages*2 < total_swap_pages)

/* linux/mm/oom_kill.c */
extern void out_of_memory(void);

/* linux/mm/memory.c */
extern void swapin_readahead(swp_entry_t);

/* linux/mm/page_alloc.c */
extern unsigned long totalram_pages;
extern unsigned long totalhigh_pages;
extern int nr_swap_pages;       /* XXX: shouldn't this be ulong? --hch */
extern unsigned int nr_free_pages(void);
extern unsigned int nr_free_pages_pgdat(pg_data_t *pgdat);
extern unsigned int nr_free_buffer_pages(void);
extern unsigned int nr_free_pagecache_pages(void);

/* linux/mm/swap.c */
extern void FASTCALL(lru_cache_add(struct page *));
extern void FASTCALL(lru_cache_add_active(struct page *));
extern void FASTCALL(activate_page(struct page *));
extern void FASTCALL(mark_page_accessed(struct page *));
extern void lru_add_drain(void);
extern int rotate_reclaimable_page(struct page *page);
extern void swap_setup(void);

/* linux/mm/vmscan.c */
extern int try_to_free_pages(struct zone *, unsigned int, unsigned int);
extern int shrink_all_memory(int);
extern int vm_swappiness;

/* linux/mm/rmap.c */
#ifdef CONFIG_MMU
int FASTCALL(page_referenced(struct page *));
struct pte_chain *FASTCALL(page_add_rmap(struct page *, pte_t *,
                                        struct pte_chain *));
void FASTCALL(page_remove_rmap(struct page *, pte_t *));
int FASTCALL(try_to_unmap(struct page *));

/* linux/mm/shmem.c */
extern int shmem_unuse(swp_entry_t entry, struct page *page);
#else
#define page_referenced(page)   TestClearPageReferenced(page)
#define try_to_unmap(page)      SWAP_FAIL
#endif /* CONFIG_MMU */

/* return values of try_to_unmap */
#define SWAP_SUCCESS    0
#define SWAP_AGAIN      1
#define SWAP_FAIL       2

#ifdef CONFIG_SWAP
/* linux/mm/page_io.c */
extern int swap_readpage(struct file *, struct page *);
extern int swap_writepage(struct page *page, struct writeback_control *wbc);
extern int rw_swap_page_sync(int, swp_entry_t, struct page *);

/* linux/mm/swap_state.c */
extern struct address_space swapper_space;
#define total_swapcache_pages  swapper_space.nrpages
extern void show_swap_cache_info(void);
extern int add_to_swap(struct page *);
extern void __delete_from_swap_cache(struct page *);
extern void delete_from_swap_cache(struct page *);
extern int move_to_swap_cache(struct page *, swp_entry_t);
extern int move_from_swap_cache(struct page *, unsigned long,
                struct address_space *);
extern void free_page_and_swap_cache(struct page *);
extern void free_pages_and_swap_cache(struct page **, int);
extern struct page * lookup_swap_cache(swp_entry_t);
extern struct page * read_swap_cache_async(swp_entry_t);

/* linux/mm/swapfile.c */
extern int total_swap_pages;
extern unsigned int nr_swapfiles;
extern struct swap_info_struct swap_info[];
extern void si_swapinfo(struct sysinfo *);
extern swp_entry_t get_swap_page(void);
extern int swap_duplicate(swp_entry_t);
extern int valid_swaphandles(swp_entry_t, unsigned long *);
extern void swap_free(swp_entry_t);
extern void free_swap_and_cache(swp_entry_t);
extern sector_t map_swap_page(struct swap_info_struct *, pgoff_t);
extern struct swap_info_struct *get_swap_info_struct(unsigned);
extern int can_share_swap_page(struct page *);
extern int remove_exclusive_swap_page(struct page *);

extern struct swap_list_t swap_list;
extern spinlock_t swaplock;

#define swap_list_lock()        spin_lock(&swaplock)
#define swap_list_unlock()      spin_unlock(&swaplock)
#define swap_device_lock(p)     spin_lock(&p->sdev_lock)
#define swap_device_unlock(p)   spin_unlock(&p->sdev_lock)

#else /* CONFIG_SWAP */

#define total_swap_pages                        0
#define total_swapcache_pages                   0UL

#define si_swapinfo(val) \
        do { (val)->freeswap = (val)->totalswap = 0; } while (0)
#define free_page_and_swap_cache(page) \
        page_cache_release(page)
#define free_pages_and_swap_cache(pages, nr) \
        release_pages((pages), (nr), 0);

#define show_swap_cache_info()                  /*NOTHING*/
#define free_swap_and_cache(swp)                /*NOTHING*/
#define swap_duplicate(swp)                     /*NOTHING*/
#define swap_free(swp)                          /*NOTHING*/
#define read_swap_cache_async(swp)              NULL
#define lookup_swap_cache(swp)                  NULL
#define valid_swaphandles(swp, off)             0
#define can_share_swap_page(p)                  0
#define move_to_swap_cache(p, swp)              1
#define move_from_swap_cache(p, i, m)           1
#define __delete_from_swap_cache(p)             /*NOTHING*/
#define delete_from_swap_cache(p)               /*NOTHING*/

static inline int remove_exclusive_swap_page(struct page *p)
{
        return 0;
}

static inline swp_entry_t get_swap_page(void)
{
        swp_entry_t entry;
        entry.val = 0;
        return entry;
}

#endif /* CONFIG_SWAP */
#endif /* __KERNEL__*/
#endif /* _LINUX_SWAP_H */