#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 <asm/atomic.h>
#include <asm/page.h>
-struct bio;
-
#define SWAP_FLAG_PREFER 0x8000 /* set if swap priority specified */
#define SWAP_FLAG_PRIO_MASK 0x7fff
#define SWAP_FLAG_PRIO_SHIFT 0
* the type/offset into the pte as 5/27 as well.
*/
#define MAX_SWAPFILES_SHIFT 5
-#ifndef CONFIG_MIGRATION
#define MAX_SWAPFILES (1 << MAX_SWAPFILES_SHIFT)
-#else
-/* Use last two entries for page migration swap entries */
-#define MAX_SWAPFILES ((1 << MAX_SWAPFILES_SHIFT)-2)
-#define SWP_MIGRATION_READ MAX_SWAPFILES
-#define SWP_MIGRATION_WRITE (MAX_SWAPFILES + 1)
-#endif
/*
* Magic header for a swap area. The first part of the union is
char magic[10]; /* SWAP-SPACE or SWAPSPACE2 */
} magic;
struct {
- char bootbits[1024]; /* Space for disklabel etc. */
- __u32 version;
- __u32 last_page;
- __u32 nr_badpages;
- unsigned char sws_uuid[16];
- unsigned char sws_volume[16];
- __u32 padding[117];
- __u32 badpages[1];
+ 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;
};
/* linux/mm/page_alloc.c */
extern unsigned long totalram_pages;
extern unsigned long totalhigh_pages;
-extern unsigned long totalreserve_pages;
extern long nr_swap_pages;
extern unsigned int nr_free_pages(void);
extern unsigned int nr_free_pages_pgdat(pg_data_t *pgdat);
extern void swap_setup(void);
/* linux/mm/vmscan.c */
-extern unsigned long try_to_free_pages(struct zone **, gfp_t);
-extern unsigned long shrink_all_memory(unsigned long nr_pages);
+extern int try_to_free_pages(struct zone **, gfp_t);
+extern int shrink_all_memory(int);
extern int vm_swappiness;
-extern int remove_mapping(struct address_space *mapping, struct page *page);
-extern long vm_total_pages;
#ifdef CONFIG_NUMA
extern int zone_reclaim_mode;
-extern int sysctl_min_unmapped_ratio;
-extern int sysctl_min_slab_ratio;
+extern int zone_reclaim_interval;
extern int zone_reclaim(struct zone *, gfp_t, unsigned int);
#else
#define zone_reclaim_mode 0
}
#endif
-extern int kswapd_run(int nid);
+#ifdef CONFIG_MIGRATION
+extern int isolate_lru_page(struct page *p);
+extern int putback_lru_pages(struct list_head *l);
+extern int migrate_page(struct page *, struct page *);
+extern void migrate_page_copy(struct page *, struct page *);
+extern int migrate_page_remove_references(struct page *, struct page *, int);
+extern int migrate_pages(struct list_head *l, struct list_head *t,
+ struct list_head *moved, struct list_head *failed);
+extern int fail_migrate_page(struct page *, struct page *);
+#else
+static inline int isolate_lru_page(struct page *p) { return -ENOSYS; }
+static inline int putback_lru_pages(struct list_head *l) { return 0; }
+static inline int migrate_pages(struct list_head *l, struct list_head *t,
+ struct list_head *moved, struct list_head *failed) { return -ENOSYS; }
+/* Possible settings for the migrate_page() method in address_operations */
+#define migrate_page NULL
+#define fail_migrate_page NULL
+#endif
#ifdef CONFIG_MMU
/* linux/mm/shmem.c */
/* 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 rw, swp_entry_t entry, struct page *page,
- struct bio **bio_chain);
-extern int end_swap_bio_read(struct bio *bio, unsigned int bytes_done, int err);
+extern int rw_swap_page_sync(int, swp_entry_t, struct page *);
/* linux/mm/swap_state.c */
extern struct address_space swapper_space;
/* linux/mm/swapfile.c */
extern long 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 swp_entry_t get_swap_page_of_type(int);
+extern swp_entry_t get_swap_page_of_type(int type);
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 int swap_type_of(dev_t);
-extern unsigned int count_swap_pages(int, int);
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 *);
struct backing_dev_info;
extern spinlock_t swap_lock;
+extern int remove_vma_swap(struct vm_area_struct *vma, struct page *page);
/* linux/mm/thrash.c */
extern struct mm_struct * swap_token_mm;
#define free_pages_and_swap_cache(pages, nr) \
release_pages((pages), (nr), 0);
-static inline void show_swap_cache_info(void)
-{
-}
-
-static inline void free_swap_and_cache(swp_entry_t swp)
-{
-}
-
-static inline int swap_duplicate(swp_entry_t swp)
-{
- return 0;
-}
-
-static inline void swap_free(swp_entry_t swp)
-{
-}
-
-static inline struct page *read_swap_cache_async(swp_entry_t swp,
- struct vm_area_struct *vma, unsigned long addr)
-{
- return NULL;
-}
-
-static inline struct page *lookup_swap_cache(swp_entry_t swp)
-{
- return NULL;
-}
-
-static inline int valid_swaphandles(swp_entry_t entry, unsigned long *offset)
-{
- return 0;
-}
-
-#define can_share_swap_page(p) (page_mapcount(p) == 1)
-
-static inline int move_to_swap_cache(struct page *page, swp_entry_t entry)
-{
- return 1;
-}
-
-static inline int move_from_swap_cache(struct page *page, unsigned long index,
- struct address_space *mapping)
-{
- return 1;
-}
-
-static inline void __delete_from_swap_cache(struct page *page)
-{
-}
-
-static inline void delete_from_swap_cache(struct page *page)
-{
-}
-
+#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,vma,addr) 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*/
#define swap_token_default_timeout 0
static inline int remove_exclusive_swap_page(struct page *p)
git://git.onelab.eu / linux-2.6.git / blobdiff