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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 | #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 struct swap_info_struct { unsigned int flags; kdev_t swap_device; struct inode * swap_file; unsigned char * 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 */ }; 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 */ extern void swap_in(struct task_struct *, struct vm_area_struct *, pte_t *, unsigned long, int); /* 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 */ extern int nr_swapfiles; extern struct swap_info_struct swap_info[]; void si_swapinfo(struct sysinfo *); 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 /* __KERNEL__*/ #endif /* _LINUX_SWAP_H */ |