1 #ifndef _LINUX_MIGRATE_H
2 #define _LINUX_MIGRATE_H
5 #include <linux/mempolicy.h>
6 #include <linux/migrate_mode.h>
8 typedef struct page *new_page_t(struct page *, unsigned long private, int **);
11 * Return values from addresss_space_operations.migratepage():
12 * - negative errno on page migration failure;
13 * - zero on page migration success;
15 #define MIGRATEPAGE_SUCCESS 0
17 #ifdef CONFIG_MIGRATION
19 extern void putback_lru_pages(struct list_head *l);
20 extern int migrate_page(struct address_space *,
21 struct page *, struct page *, enum migrate_mode);
22 extern int migrate_pages(struct list_head *l, new_page_t x,
23 unsigned long private, bool offlining,
24 enum migrate_mode mode);
25 extern int migrate_huge_page(struct page *, new_page_t x,
26 unsigned long private, bool offlining,
27 enum migrate_mode mode);
29 extern int fail_migrate_page(struct address_space *,
30 struct page *, struct page *);
32 extern int migrate_prep(void);
33 extern int migrate_prep_local(void);
34 extern int migrate_vmas(struct mm_struct *mm,
35 const nodemask_t *from, const nodemask_t *to,
37 extern void migrate_page_copy(struct page *newpage, struct page *page);
38 extern int migrate_huge_page_move_mapping(struct address_space *mapping,
39 struct page *newpage, struct page *page);
42 static inline void putback_lru_pages(struct list_head *l) {}
43 static inline int migrate_pages(struct list_head *l, new_page_t x,
44 unsigned long private, bool offlining,
45 enum migrate_mode mode) { return -ENOSYS; }
46 static inline int migrate_huge_page(struct page *page, new_page_t x,
47 unsigned long private, bool offlining,
48 enum migrate_mode mode) { return -ENOSYS; }
50 static inline int migrate_prep(void) { return -ENOSYS; }
51 static inline int migrate_prep_local(void) { return -ENOSYS; }
53 static inline int migrate_vmas(struct mm_struct *mm,
54 const nodemask_t *from, const nodemask_t *to,
60 static inline void migrate_page_copy(struct page *newpage,
63 static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
64 struct page *newpage, struct page *page)
69 /* Possible settings for the migrate_page() method in address_operations */
70 #define migrate_page NULL
71 #define fail_migrate_page NULL
73 #endif /* CONFIG_MIGRATION */
74 #endif /* _LINUX_MIGRATE_H */