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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 | #ifndef _LINUX_SWAP_H
#define _LINUX_SWAP_H
#include <linux/spinlock.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
#define MAX_SWAPFILES 8
union swap_header {
struct
{
char reserved[PAGE_SIZE - 10];
char magic[10];
} 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;
};
#ifdef __KERNEL__
/*
* 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))
#include <asm/atomic.h>
#define SWP_USED 1
#define SWP_WRITEOK 3
#define SWAP_CLUSTER_MAX 32
#define SWAP_MAP_MAX 0x7fff
#define SWAP_MAP_BAD 0x8000
struct swap_info_struct {
unsigned int flags;
kdev_t swap_device;
spinlock_t sdev_lock;
struct dentry * swap_file;
struct vfsmount *swap_vfsmnt;
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;
int next; /* next entry on swap list */
};
extern int nr_swap_pages;
FASTCALL(unsigned int nr_free_pages(void));
FASTCALL(unsigned int nr_free_buffer_pages(void));
FASTCALL(unsigned int nr_free_highpages(void));
extern int nr_lru_pages;
extern atomic_t nr_async_pages;
extern struct address_space swapper_space;
extern atomic_t page_cache_size;
extern atomic_t buffermem_pages;
/* Incomplete types for prototype declarations: */
struct task_struct;
struct vm_area_struct;
struct sysinfo;
struct zone_t;
/* linux/ipc/shm.c */
extern int shm_swap(int, int);
/* linux/mm/swap.c */
extern void swap_setup(void);
/* linux/mm/vmscan.c */
extern int try_to_free_pages(unsigned int gfp_mask);
/* linux/mm/page_io.c */
extern void rw_swap_page(int, struct page *, int);
extern void rw_swap_page_nolock(int, swp_entry_t, char *, int);
/* linux/mm/page_alloc.c */
/* linux/mm/swap_state.c */
extern void show_swap_cache_info(void);
extern void add_to_swap_cache(struct page *, swp_entry_t);
extern int swap_check_entry(unsigned long);
extern struct page * lookup_swap_cache(swp_entry_t);
extern struct page * read_swap_cache_async(swp_entry_t, int);
#define read_swap_cache(entry) read_swap_cache_async(entry, 1);
/*
* Make these inline later once they are working properly.
*/
extern void __delete_from_swap_cache(struct page *page);
extern void delete_from_swap_cache(struct page *page);
extern void delete_from_swap_cache_nolock(struct page *page);
extern void free_page_and_swap_cache(struct page *page);
/* linux/mm/swapfile.c */
extern unsigned int nr_swapfiles;
extern struct swap_info_struct swap_info[];
extern int is_swap_partition(kdev_t);
extern void si_swapinfo(struct sysinfo *);
extern swp_entry_t __get_swap_page(unsigned short);
extern void get_swaphandle_info(swp_entry_t, unsigned long *, kdev_t *,
struct inode **);
extern int swap_duplicate(swp_entry_t);
extern int swap_count(struct page *);
extern int valid_swaphandles(swp_entry_t, unsigned long *);
#define get_swap_page() __get_swap_page(1)
extern void __swap_free(swp_entry_t, unsigned short);
#define swap_free(entry) __swap_free((entry), 1)
struct swap_list_t {
int head; /* head of priority-ordered swapfile list */
int next; /* swapfile to be used next */
};
extern struct swap_list_t swap_list;
asmlinkage long sys_swapoff(const char *);
asmlinkage long sys_swapon(const char *, int);
#define SWAP_CACHE_INFO
#ifdef SWAP_CACHE_INFO
extern unsigned long swap_cache_add_total;
extern unsigned long swap_cache_del_total;
extern unsigned long swap_cache_find_total;
extern unsigned long swap_cache_find_success;
#endif
/*
* Work out if there are any other processes sharing this page, ignoring
* any page reference coming from the swap cache, or from outstanding
* swap IO on this page. (The page cache _does_ count as another valid
* reference to the page, however.)
*/
static inline int is_page_shared(struct page *page)
{
unsigned int count;
if (PageReserved(page))
return 1;
count = page_count(page);
if (PageSwapCache(page))
count += swap_count(page) - 2 - !!page->buffers;
return count > 1;
}
extern spinlock_t pagemap_lru_lock;
/*
* Helper macros for lru_pages handling.
*/
#define lru_cache_add(page) \
do { \
spin_lock(&pagemap_lru_lock); \
list_add(&(page)->lru, &lru_cache); \
nr_lru_pages++; \
spin_unlock(&pagemap_lru_lock); \
} while (0)
#define __lru_cache_del(page) \
do { \
list_del(&(page)->lru); \
nr_lru_pages--; \
} while (0)
#define lru_cache_del(page) \
do { \
if (!PageLocked(page)) \
BUG(); \
spin_lock(&pagemap_lru_lock); \
__lru_cache_del(page); \
spin_unlock(&pagemap_lru_lock); \
} while (0)
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)
#endif /* __KERNEL__*/
#endif /* _LINUX_SWAP_H */
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