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#ifndef _LINUX_MIGRATE_H

#define _LINUX_MIGRATE_H

#include <linux/mm.h>

#include <linux/mempolicy.h>

#include <linux/pagemap.h>

typedef struct page *new_page_t(struct page *, unsigned long private, int **);

#ifdef CONFIG_MIGRATION

/* Check if a vma is migratable */

static inline int vma_migratable(struct vm_area_struct *vma)

{

        if (vma->vm_flags & (VM_IO|VM_HUGETLB|VM_PFNMAP|VM_RESERVED))

                return 0;

        /*

         * Migration allocates pages in the highest zone. If we cannot

         * do so then migration (at least from node to node) is not

         * possible.

         */

        if (vma->vm_file &&

                gfp_zone(mapping_gfp_mask(vma->vm_file->f_mapping))

                                                                < policy_zone)

                        return 0;

        return 1;

}

extern int isolate_lru_page(struct page *p, struct list_head *pagelist);

extern int putback_lru_pages(struct list_head *l);

extern int migrate_page(struct address_space *,

                        struct page *, struct page *);

extern int migrate_pages(struct list_head *l, new_page_t x, unsigned long);

extern int fail_migrate_page(struct address_space *,

                        struct page *, struct page *);

extern int migrate_prep(void);

extern int migrate_vmas(struct mm_struct *mm,

                const nodemask_t *from, const nodemask_t *to,

                unsigned long flags);

#else

static inline int vma_migratable(struct vm_area_struct *vma)

                                        { return 0; }

static inline int isolate_lru_page(struct page *p, struct list_head *list)

                                        { return -ENOSYS; }

static inline int putback_lru_pages(struct list_head *l) { return 0; }

static inline int migrate_pages(struct list_head *l, new_page_t x,

                unsigned long private) { return -ENOSYS; }

static inline int migrate_pages_to(struct list_head *pagelist,

                        struct vm_area_struct *vma, int dest) { return 0; }

static inline int migrate_prep(void) { return -ENOSYS; }

static inline int migrate_vmas(struct mm_struct *mm,

                const nodemask_t *from, const nodemask_t *to,

                unsigned long flags)

{

        return -ENOSYS;

}

/* Possible settings for the migrate_page() method in address_operations */

#define migrate_page NULL

#define fail_migrate_page NULL

#endif /* CONFIG_MIGRATION */

#endif /* _LINUX_MIGRATE_H */