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[mirror_ubuntu-artful-kernel.git] / include / linux / migrate.h
1 #ifndef _LINUX_MIGRATE_H
2 #define _LINUX_MIGRATE_H
3
4 #include <linux/mm.h>
5
6 typedef struct page *new_page_t(struct page *, unsigned long private, int **);
7
8 #ifdef CONFIG_MIGRATION
9 extern int isolate_lru_page(struct page *p, struct list_head *pagelist);
10 extern int putback_lru_pages(struct list_head *l);
11 extern int migrate_page(struct address_space *,
12 struct page *, struct page *);
13 extern int migrate_pages(struct list_head *l, new_page_t x, unsigned long);
14
15 extern int fail_migrate_page(struct address_space *,
16 struct page *, struct page *);
17
18 extern int migrate_prep(void);
19 extern int migrate_vmas(struct mm_struct *mm,
20 const nodemask_t *from, const nodemask_t *to,
21 unsigned long flags);
22 #else
23
24 static inline int isolate_lru_page(struct page *p, struct list_head *list)
25 { return -ENOSYS; }
26 static inline int putback_lru_pages(struct list_head *l) { return 0; }
27 static inline int migrate_pages(struct list_head *l, new_page_t x,
28 unsigned long private) { return -ENOSYS; }
29
30 static inline int migrate_pages_to(struct list_head *pagelist,
31 struct vm_area_struct *vma, int dest) { return 0; }
32
33 static inline int migrate_prep(void) { return -ENOSYS; }
34
35 static inline int migrate_vmas(struct mm_struct *mm,
36 const nodemask_t *from, const nodemask_t *to,
37 unsigned long flags)
38 {
39 return -ENOSYS;
40 }
41
42 /* Possible settings for the migrate_page() method in address_operations */
43 #define migrate_page NULL
44 #define fail_migrate_page NULL
45
46 #endif /* CONFIG_MIGRATION */
47 #endif /* _LINUX_MIGRATE_H */