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
  12 extern void putback_lru_pages(struct list_head *l);
  13 extern int migrate_page(struct address_space *,
  14                         struct page *, struct page *, enum migrate_mode);
  15 extern int migrate_pages(struct list_head *l, new_page_t x,
  16                         unsigned long private, bool offlining,
  17                         enum migrate_mode mode);
  18 extern int migrate_huge_page(struct page *, new_page_t x,
  19                         unsigned long private, bool offlining,
  20                         enum migrate_mode mode);
  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
  35 static inline void putback_lru_pages(struct list_head *l) {}
  36 static inline int migrate_pages(struct list_head *l, new_page_t x,
  37                 unsigned long private, bool offlining,
  38                 enum migrate_mode mode) { return -ENOSYS; }
  39 static inline int migrate_huge_page(struct page *page, new_page_t x,
  40                 unsigned long private, bool offlining,
  41                 enum migrate_mode mode) { return -ENOSYS; }
  42
  43 static inline int migrate_prep(void) { return -ENOSYS; }
  44 static inline int migrate_prep_local(void) { return -ENOSYS; }
  45
  46 static inline int migrate_vmas(struct mm_struct *mm,
  47                 const nodemask_t *from, const nodemask_t *to,
  48                 unsigned long flags)
  49 {
  50         return -ENOSYS;
  51 }
  52
  53 static inline void migrate_page_copy(struct page *newpage,
  54                                      struct page *page) {}
  55
  56 static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
  57                                   struct page *newpage, struct page *page)
  58 {
  59         return -ENOSYS;
  60 }
  61
  62 /* Possible settings for the migrate_page() method in address_operations */
  63 #define migrate_page NULL
  64 #define fail_migrate_page NULL
  65
  66 #endif /* CONFIG_MIGRATION */
  67 #endif /* _LINUX_MIGRATE_H */