1 #ifndef _LINUX_MIGRATE_H
2 #define _LINUX_MIGRATE_H
3
4 #include <linux/mm.h>
5 #include <linux/mempolicy.h>
6 #include <linux/pagemap.h>
7
8 typedef struct page *new_page_t(struct page *, unsigned long private, int **);
9
10 #ifdef CONFIG_MIGRATION
11 /* Check if a vma is migratable */
12 static inline int vma_migratable(struct vm_area_struct *vma)
13 {
14 if (vma->vm_flags & (VM_IO|VM_HUGETLB|VM_PFNMAP|VM_RESERVED))
15 return 0;
16 /*
17 * Migration allocates pages in the highest zone. If we cannot
18 * do so then migration (at least from node to node) is not
19 * possible.
20 */
21 if (vma->vm_file &&
22 gfp_zone(mapping_gfp_mask(vma->vm_file->f_mapping))
23 < policy_zone)
24 return 0;
25 return 1;
26 }
27
28 extern int isolate_lru_page(struct page *p, struct list_head *pagelist);
29 extern int putback_lru_pages(struct list_head *l);
30 extern int migrate_page(struct address_space *,
31 struct page *, struct page *);
32 extern int migrate_pages(struct list_head *l, new_page_t x, unsigned long);
33
34 extern int fail_migrate_page(struct address_space *,
35 struct page *, struct page *);
36
37 extern int migrate_prep(void);
38 extern int migrate_vmas(struct mm_struct *mm,
39 const nodemask_t *from, const nodemask_t *to,
40 unsigned long flags);
41 #else
42 static inline int vma_migratable(struct vm_area_struct *vma)
43 { return 0; }
44
45 static inline int isolate_lru_page(struct page *p, struct list_head *list)
46 { return -ENOSYS; }
47 static inline int putback_lru_pages(struct list_head *l) { return 0; }
48 static inline int migrate_pages(struct list_head *l, new_page_t x,
49 unsigned long private) { return -ENOSYS; }
50
51 static inline int migrate_pages_to(struct list_head *pagelist,
52 struct vm_area_struct *vma, int dest) { return 0; }
53
54 static inline int migrate_prep(void) { return -ENOSYS; }
55
56 static inline int migrate_vmas(struct mm_struct *mm,
57 const nodemask_t *from, const nodemask_t *to,
58 unsigned long flags)
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 */
69
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