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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 | #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 32
/*
* 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;
};
#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
/*
* The in-memory structure used to track swap areas.
*/
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;
extern unsigned int nr_free_pages(void);
extern unsigned int nr_free_buffer_pages(void);
extern int nr_active_pages;
extern int nr_inactive_pages;
extern atomic_t nr_async_pages;
extern atomic_t page_cache_size;
extern atomic_t buffermem_pages;
extern spinlock_t pagecache_lock;
extern void __remove_inode_page(struct page *);
/* Incomplete types for prototype declarations: */
struct task_struct;
struct vm_area_struct;
struct sysinfo;
struct zone_t;
/* linux/mm/swap.c */
extern void FASTCALL(lru_cache_add(struct page *));
extern void FASTCALL(__lru_cache_del(struct page *));
extern void FASTCALL(lru_cache_del(struct page *));
extern void FASTCALL(deactivate_page(struct page *));
extern void FASTCALL(deactivate_page_nolock(struct page *));
extern void FASTCALL(activate_page(struct page *));
extern void FASTCALL(activate_page_nolock(struct page *));
extern void swap_setup(void);
/* linux/mm/vmscan.c */
extern wait_queue_head_t kswapd_wait;
extern int FASTCALL(try_to_free_pages(zone_t *, unsigned int, unsigned int));
/* linux/mm/page_io.c */
extern void rw_swap_page(int, struct page *);
extern void rw_swap_page_nolock(int, swp_entry_t, char *);
/* linux/mm/page_alloc.c */
/* linux/mm/swap_state.c */
#define SWAP_CACHE_INFO
#ifdef SWAP_CACHE_INFO
extern void show_swap_cache_info(void);
#endif
extern int add_to_swap_cache(struct page *, swp_entry_t);
extern void __delete_from_swap_cache(struct page *page);
extern void delete_from_swap_cache(struct page *page);
extern void free_page_and_swap_cache(struct page *page);
extern struct page * lookup_swap_cache(swp_entry_t);
extern struct page * read_swap_cache_async(swp_entry_t);
/* linux/mm/oom_kill.c */
extern int out_of_memory(void);
extern void oom_kill(void);
/* linux/mm/swapfile.c */
extern int total_swap_pages;
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(void);
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 *);
extern void swap_free(swp_entry_t);
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);
extern spinlock_t pagemap_lru_lock;
extern void FASTCALL(mark_page_accessed(struct page *));
/*
* List add/del helper macros. These must be called
* with the pagemap_lru_lock held!
*/
#define DEBUG_LRU_PAGE(page) \
do { \
if (PageActive(page)) \
BUG(); \
if (PageInactive(page)) \
BUG(); \
if (page_count(page) == 0) \
BUG(); \
} while (0)
#define add_page_to_active_list(page) \
do { \
DEBUG_LRU_PAGE(page); \
SetPageActive(page); \
list_add(&(page)->lru, &active_list); \
nr_active_pages++; \
} while (0)
#define add_page_to_inactive_list(page) \
do { \
DEBUG_LRU_PAGE(page); \
SetPageInactive(page); \
list_add(&(page)->lru, &inactive_list); \
nr_inactive_pages++; \
} while (0)
#define del_page_from_active_list(page) \
do { \
list_del(&(page)->lru); \
ClearPageActive(page); \
nr_active_pages--; \
DEBUG_LRU_PAGE(page); \
} while (0)
#define del_page_from_inactive_list(page) \
do { \
list_del(&(page)->lru); \
ClearPageInactive(page); \
nr_inactive_pages--; \
DEBUG_LRU_PAGE(page); \
} while (0)
/*
* Ugly ugly ugly HACK to make sure the inactive lists
* don't fill up with unfreeable ramdisk pages. We really
* want to fix the ramdisk driver to mark its pages as
* unfreeable instead of using dirty buffer magic, but the
* next code-change time is when 2.5 is forked...
*/
#ifndef _LINUX_KDEV_T_H
#include <linux/kdev_t.h>
#endif
#ifndef _LINUX_MAJOR_H
#include <linux/major.h>
#endif
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)
extern void shmem_unuse(swp_entry_t entry, struct page *page);
#endif /* __KERNEL__*/
#endif /* _LINUX_SWAP_H */
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