6 #define SWAP_FLAG_PREFER 0x8000 /* set if swap priority specified */
7 #define SWAP_FLAG_PRIO_MASK 0x7fff
8 #define SWAP_FLAG_PRIO_SHIFT 0
10 #define MAX_SWAPFILES 8
15 char reserved
[PAGE_SIZE
- 10];
20 char bootbits
[1024]; /* Space for disklabel etc. */
22 unsigned int last_page
;
23 unsigned int nr_badpages
;
24 unsigned int padding
[125];
25 unsigned int badpages
[1];
32 * Max bad pages in the new format..
34 #define __swapoffset(x) ((unsigned long)&((union swap_header *)0)->x)
35 #define MAX_SWAP_BADPAGES \
36 ((__swapoffset(magic.magic) - __swapoffset(info.badpages)) / sizeof(int))
40 #include <asm/atomic.h>
45 #define SWAP_CLUSTER_MAX 32
47 #define SWAP_MAP_MAX 0x7fff
48 #define SWAP_MAP_BAD 0x8000
50 struct swap_info_struct
{
53 struct dentry
* swap_file
;
54 unsigned short * swap_map
;
55 unsigned char * swap_lockmap
;
56 unsigned int lowest_bit
;
57 unsigned int highest_bit
;
58 unsigned int cluster_next
;
59 unsigned int cluster_nr
;
60 int prio
; /* swap priority */
63 int next
; /* next entry on swap list */
66 extern int nr_swap_pages
;
67 extern int nr_free_pages
;
68 extern atomic_t nr_async_pages
;
69 extern struct inode swapper_inode
;
70 extern atomic_t page_cache_size
;
73 /* Incomplete types for prototype declarations: */
75 struct vm_area_struct
;
79 extern int shm_swap (int, int);
82 extern void swap_setup (void);
84 /* linux/mm/vmscan.c */
85 extern int try_to_free_pages(unsigned int gfp_mask
);
87 /* linux/mm/page_io.c */
88 extern void rw_swap_page(int, unsigned long, char *, int);
89 extern void rw_swap_page_nocache(int, unsigned long, char *);
90 extern void rw_swap_page_nolock(int, unsigned long, char *, int);
91 extern void swap_after_unlock_page (unsigned long entry
);
93 /* linux/mm/page_alloc.c */
94 extern void swap_in(struct task_struct
*, struct vm_area_struct
*,
95 pte_t
*, unsigned long, int);
98 /* linux/mm/swap_state.c */
99 extern void show_swap_cache_info(void);
100 extern int add_to_swap_cache(struct page
*, unsigned long);
101 extern int swap_duplicate(unsigned long);
102 extern int swap_check_entry(unsigned long);
103 struct page
* lookup_swap_cache(unsigned long);
104 extern struct page
* read_swap_cache_async(unsigned long, int);
105 #define read_swap_cache(entry) read_swap_cache_async(entry, 1);
106 extern int FASTCALL(swap_count(unsigned long));
108 * Make these inline later once they are working properly.
110 extern void delete_from_swap_cache(struct page
*page
);
111 extern void free_page_and_swap_cache(unsigned long addr
);
113 /* linux/mm/swapfile.c */
114 extern unsigned int nr_swapfiles
;
115 extern struct swap_info_struct swap_info
[];
116 extern int is_swap_partition(kdev_t
);
117 void si_swapinfo(struct sysinfo
*);
118 unsigned long get_swap_page(void);
119 extern void FASTCALL(swap_free(unsigned long));
121 int head
; /* head of priority-ordered swapfile list */
122 int next
; /* swapfile to be used next */
124 extern struct swap_list_t swap_list
;
125 asmlinkage
int sys_swapoff(const char *);
126 asmlinkage
int sys_swapon(const char *, int);
129 * vm_ops not present page codes for shared memory.
131 * Will go away eventually..
133 #define SHM_SWP_TYPE 0x20
136 * swap cache stuff (in linux/mm/swap_state.c)
139 #define SWAP_CACHE_INFO
141 #ifdef SWAP_CACHE_INFO
142 extern unsigned long swap_cache_add_total
;
143 extern unsigned long swap_cache_del_total
;
144 extern unsigned long swap_cache_find_total
;
145 extern unsigned long swap_cache_find_success
;
148 extern inline unsigned long in_swap_cache(struct page
*page
)
150 if (PageSwapCache(page
))
156 * Work out if there are any other processes sharing this page, ignoring
157 * any page reference coming from the swap cache, or from outstanding
158 * swap IO on this page. (The page cache _does_ count as another valid
159 * reference to the page, however.)
161 static inline int is_page_shared(struct page
*page
)
164 if (PageReserved(page
))
166 count
= page_count(page
);
167 if (PageSwapCache(page
))
168 count
+= swap_count(page
->offset
) - 2;
169 if (PageFreeAfter(page
))
174 #endif /* __KERNEL__*/
176 #endif /* _LINUX_SWAP_H */