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, bool offlining,
  17                         bool sync);
  18 extern int migrate_huge_pages(struct list_head *l, new_page_t x,
  19                         unsigned long private, bool offlining,
  20                         bool sync);
  21
  22 extern int fail_migrate_page(struct address_space *,
  23                         struct page *, struct page *);
  24
  25 extern int migrate_prep(void);
  26 extern int migrate_prep_local(void);
  27 extern int migrate_vmas(struct mm_struct *mm,
  28                 const nodemask_t *from, const nodemask_t *to,
  29                 unsigned long flags);
  30 extern void migrate_page_copy(struct page *newpage, struct page *page);
  31 extern int migrate_huge_page_move_mapping(struct address_space *mapping,
  32                                   struct page *newpage, struct page *page);
  33 #else
  34 #define PAGE_MIGRATION 0
  35
  36 static inline void putback_lru_pages(struct list_head *l) {}
  37 static inline int migrate_pages(struct list_head *l, new_page_t x,
  38                 unsigned long private, bool offlining,
  39                 bool sync) { return -ENOSYS; }
  40 static inline int migrate_huge_pages(struct list_head *l, new_page_t x,
  41                 unsigned long private, bool offlining,
  42                 bool sync) { return -ENOSYS; }
  43
  44 static inline int migrate_prep(void) { return -ENOSYS; }
  45 static inline int migrate_prep_local(void) { return -ENOSYS; }
  46
  47 static inline int migrate_vmas(struct mm_struct *mm,
  48                 const nodemask_t *from, const nodemask_t *to,
  49                 unsigned long flags)
  50 {
  51         return -ENOSYS;
  52 }
  53
  54 static inline void migrate_page_copy(struct page *newpage,
  55                                      struct page *page) {}
  56
  57 static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
  58                                   struct page *newpage, struct page *page)
  59 {
  60         return -ENOSYS;
  61 }
  62
  63 /* Possible settings for the migrate_page() method in address_operations */
  64 #define migrate_page NULL
  65 #define fail_migrate_page NULL
  66
  67 #endif /* CONFIG_MIGRATION */
  68 #endif /* _LINUX_MIGRATE_H */