include/linux/migrate.h

   1 #ifndef _LINUX_MIGRATE_H
   2 #define _LINUX_MIGRATE_H
   3
   4 #include <linux/mm.h>
   5
   6 typedef struct page *new_page_t(struct page *, unsigned long private, int **);
   7
   8 /* Check if a vma is migratable */
   9 static inline int vma_migratable(struct vm_area_struct *vma)
  10 {
  11         if (vma->vm_flags & (VM_IO|VM_HUGETLB|VM_PFNMAP|VM_RESERVED))
  12                 return 0;
  13         return 1;
  14 }
  15
  16 #ifdef CONFIG_MIGRATION
  17 extern int isolate_lru_page(struct page *p, struct list_head *pagelist);
  18 extern int putback_lru_pages(struct list_head *l);
  19 extern int migrate_page(struct address_space *,
  20                         struct page *, struct page *);
  21 extern int migrate_pages(struct list_head *l, new_page_t x, unsigned long);
  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_vmas(struct mm_struct *mm,
  28                 const nodemask_t *from, const nodemask_t *to,
  29                 unsigned long flags);
  30 #else
  31
  32 static inline int isolate_lru_page(struct page *p, struct list_head *list)
  33                                         { return -ENOSYS; }
  34 static inline int putback_lru_pages(struct list_head *l) { return 0; }
  35 static inline int migrate_pages(struct list_head *l, new_page_t x,
  36                 unsigned long private) { return -ENOSYS; }
  37
  38 static inline int migrate_pages_to(struct list_head *pagelist,
  39                         struct vm_area_struct *vma, int dest) { return 0; }
  40
  41 static inline int migrate_prep(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 /* Possible settings for the migrate_page() method in address_operations */
  51 #define migrate_page NULL
  52 #define fail_migrate_page NULL
  53
  54 #endif /* CONFIG_MIGRATION */
  55 #endif /* _LINUX_MIGRATE_H */