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 #include <linux/migrate_mode.h>
   7
   8 typedef struct page *new_page_t(struct page *, unsigned long private, int **);
   9
  10 #ifdef CONFIG_MIGRATION
  11 #define PAGE_MIGRATION 1
  12
  13 extern void putback_lru_pages(struct list_head *l);
  14 extern int migrate_page(struct address_space *,
  15                         struct page *, struct page *, enum migrate_mode);
  16 extern int migrate_pages(struct list_head *l, new_page_t x,
  17                         unsigned long private, bool offlining,
  18                         enum migrate_mode mode);
  19 extern int migrate_huge_pages(struct list_head *l, new_page_t x,
  20                         unsigned long private, bool offlining,
  21                         enum migrate_mode mode);
  22
  23 extern int fail_migrate_page(struct address_space *,
  24                         struct page *, struct page *);
  25
  26 extern int migrate_prep(void);
  27 extern int migrate_prep_local(void);
  28 extern int migrate_vmas(struct mm_struct *mm,
  29                 const nodemask_t *from, const nodemask_t *to,
  30                 unsigned long flags);
  31 extern void migrate_page_copy(struct page *newpage, struct page *page);
  32 extern int migrate_huge_page_move_mapping(struct address_space *mapping,
  33                                   struct page *newpage, struct page *page);
  34 #else
  35 #define PAGE_MIGRATION 0
  36
  37 static inline void putback_lru_pages(struct list_head *l) {}
  38 static inline int migrate_pages(struct list_head *l, new_page_t x,
  39                 unsigned long private, bool offlining,
  40                 enum migrate_mode mode) { return -ENOSYS; }
  41 static inline int migrate_huge_pages(struct list_head *l, new_page_t x,
  42                 unsigned long private, bool offlining,
  43                 enum migrate_mode mode) { return -ENOSYS; }
  44
  45 static inline int migrate_prep(void) { return -ENOSYS; }
  46 static inline int migrate_prep_local(void) { return -ENOSYS; }
  47
  48 static inline int migrate_vmas(struct mm_struct *mm,
  49                 const nodemask_t *from, const nodemask_t *to,
  50                 unsigned long flags)
  51 {
  52         return -ENOSYS;
  53 }
  54
  55 static inline void migrate_page_copy(struct page *newpage,
  56                                      struct page *page) {}
  57
  58 static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
  59                                   struct page *newpage, struct page *page)
  60 {
  61         return -ENOSYS;
  62 }
  63
  64 /* Possible settings for the migrate_page() method in address_operations */
  65 #define migrate_page NULL
  66 #define fail_migrate_page NULL
  67
  68 #endif /* CONFIG_MIGRATION */
  69 #endif /* _LINUX_MIGRATE_H */