include/linux/migrate.h

   1 #ifndef _LINUX_MIGRATE_H
   2 #define _LINUX_MIGRATE_H
   3
   4 #include <linux/mm.h>
   5 #include <linux/mempolicy.h>
   6
   7 typedef struct page *new_page_t(struct page *, unsigned long private, int **);
   8
   9 #ifdef CONFIG_MIGRATION
  10 #define PAGE_MIGRATION 1
  11
  12 extern void putback_lru_pages(struct list_head *l);
  13 extern int migrate_page(struct address_space *,
  14                         struct page *, struct page *);
  15 extern int migrate_pages(struct list_head *l, new_page_t x,
  16                         unsigned long private, int offlining);
  17 extern int migrate_huge_pages(struct list_head *l, new_page_t x,
  18                         unsigned long private, int offlining);
  19
  20 extern int fail_migrate_page(struct address_space *,
  21                         struct page *, struct page *);
  22
  23 extern int migrate_prep(void);
  24 extern int migrate_prep_local(void);
  25 extern int migrate_vmas(struct mm_struct *mm,
  26                 const nodemask_t *from, const nodemask_t *to,
  27                 unsigned long flags);
  28 extern void migrate_page_copy(struct page *newpage, struct page *page);
  29 extern int migrate_huge_page_move_mapping(struct address_space *mapping,
  30                                   struct page *newpage, struct page *page);
  31 #else
  32 #define PAGE_MIGRATION 0
  33
  34 static inline void putback_lru_pages(struct list_head *l) {}
  35 static inline int migrate_pages(struct list_head *l, new_page_t x,
  36                 unsigned long private, int offlining) { return -ENOSYS; }
  37 static inline int migrate_huge_pages(struct list_head *l, new_page_t x,
  38                 unsigned long private, int offlining) { return -ENOSYS; }
  39
  40 static inline int migrate_prep(void) { return -ENOSYS; }
  41 static inline int migrate_prep_local(void) { return -ENOSYS; }
  42
  43 static inline int migrate_vmas(struct mm_struct *mm,
  44                 const nodemask_t *from, const nodemask_t *to,
  45                 unsigned long flags)
  46 {
  47         return -ENOSYS;
  48 }
  49
  50 static inline void migrate_page_copy(struct page *newpage,
  51                                      struct page *page) {}
  52
  53 static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
  54                                   struct page *newpage, struct page *page)
  55 {
  56         return -ENOSYS;
  57 }
  58
  59 /* Possible settings for the migrate_page() method in address_operations */
  60 #define migrate_page NULL
  61 #define fail_migrate_page NULL
  62
  63 #endif /* CONFIG_MIGRATION */
  64 #endif /* _LINUX_MIGRATE_H */