[linux.git] / include / linux / migrate.h

#ifndef _LINUX_MIGRATE_H
#define _LINUX_MIGRATE_H

#include <linux/mm.h>
#include <linux/mempolicy.h>

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

/*
 * MIGRATE_ASYNC means never block
 * MIGRATE_SYNC_LIGHT in the current implementation means to allow blocking
 *	on most operations but not ->writepage as the potential stall time
 *	is too significant
 * MIGRATE_SYNC will block when migrating pages
 */
enum migrate_mode {
	MIGRATE_ASYNC,
	MIGRATE_SYNC_LIGHT,
	MIGRATE_SYNC,
};

#ifdef CONFIG_MIGRATION
#define PAGE_MIGRATION 1

extern void putback_lru_pages(struct list_head *l);
extern int migrate_page(struct address_space *,
			struct page *, struct page *, enum migrate_mode);
extern int migrate_pages(struct list_head *l, new_page_t x,
			unsigned long private, bool offlining,
			enum migrate_mode mode);
extern int migrate_huge_pages(struct list_head *l, new_page_t x,
			unsigned long private, bool offlining,
			enum migrate_mode mode);

extern int fail_migrate_page(struct address_space *,
			struct page *, struct page *);

extern int migrate_prep(void);
extern int migrate_prep_local(void);
extern int migrate_vmas(struct mm_struct *mm,
		const nodemask_t *from, const nodemask_t *to,
		unsigned long flags);
extern void migrate_page_copy(struct page *newpage, struct page *page);
extern int migrate_huge_page_move_mapping(struct address_space *mapping,
				  struct page *newpage, struct page *page);
#else
#define PAGE_MIGRATION 0

static inline void putback_lru_pages(struct list_head *l) {}
static inline int migrate_pages(struct list_head *l, new_page_t x,
		unsigned long private, bool offlining,
		enum migrate_mode mode) { return -ENOSYS; }
static inline int migrate_huge_pages(struct list_head *l, new_page_t x,
		unsigned long private, bool offlining,
		enum migrate_mode mode) { return -ENOSYS; }

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

static inline void migrate_page_copy(struct page *newpage,
				     struct page *page) {}

static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
				  struct page *newpage, struct page *page)
{
	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 */
Commit	Line	Data
b20a3503 CL	1	#ifndef _LINUX_MIGRATE_H
	2	#define _LINUX_MIGRATE_H
	3
b20a3503	4	#include <linux/mm.h>
906e0be1	5	#include <linux/mempolicy.h>
b20a3503	6
742755a1	7	typedef struct page new_page_t(struct page , unsigned long private, int **);
95a402c3	8
a6bc32b8 MG	9	/*
	10	* MIGRATE_ASYNC means never block
	11	* MIGRATE_SYNC_LIGHT in the current implementation means to allow blocking
	12	* on most operations but not ->writepage as the potential stall time
	13	* is too significant
	14	* MIGRATE_SYNC will block when migrating pages
	15	*/
	16	enum migrate_mode {
	17	MIGRATE_ASYNC,
	18	MIGRATE_SYNC_LIGHT,
	19	MIGRATE_SYNC,
	20	};
	21
906e0be1	22	#ifdef CONFIG_MIGRATION
64cdd548 KM	23	#define PAGE_MIGRATION 1
64cdd548 KM	24
e13861d8	25	extern void putback_lru_pages(struct list_head *l);
2d1db3b1	26	extern int migrate_page(struct address_space *,
a6bc32b8	27	struct page , struct page , enum migrate_mode);
62b61f61	28	extern int migrate_pages(struct list_head *l, new_page_t x,
7f0f2496	29	unsigned long private, bool offlining,
a6bc32b8	30	enum migrate_mode mode);
290408d4	31	extern int migrate_huge_pages(struct list_head *l, new_page_t x,
7f0f2496	32	unsigned long private, bool offlining,
a6bc32b8	33	enum migrate_mode mode);
95a402c3	34
2d1db3b1 CL	35	extern int fail_migrate_page(struct address_space *,
2d1db3b1 CL	36	struct page , struct page );
b20a3503 CL	37
b20a3503 CL	38	extern int migrate_prep(void);
748446bb	39	extern int migrate_prep_local(void);
7b2259b3 CL	40	extern int migrate_vmas(struct mm_struct *mm,
	41	const nodemask_t from, const nodemask_t to,
	42	unsigned long flags);
290408d4 NH	43	extern void migrate_page_copy(struct page newpage, struct page page);
	44	extern int migrate_huge_page_move_mapping(struct address_space *mapping,
	45	struct page newpage, struct page page);
b20a3503	46	#else
64cdd548 KM	47	#define PAGE_MIGRATION 0
64cdd548 KM	48
e13861d8	49	static inline void putback_lru_pages(struct list_head *l) {}
95a402c3	50	static inline int migrate_pages(struct list_head *l, new_page_t x,
7f0f2496	51	unsigned long private, bool offlining,
a6bc32b8	52	enum migrate_mode mode) { return -ENOSYS; }
290408d4	53	static inline int migrate_huge_pages(struct list_head *l, new_page_t x,
7f0f2496	54	unsigned long private, bool offlining,
a6bc32b8	55	enum migrate_mode mode) { return -ENOSYS; }
9bf9e89c	56
b20a3503	57	static inline int migrate_prep(void) { return -ENOSYS; }
748446bb	58	static inline int migrate_prep_local(void) { return -ENOSYS; }
b20a3503	59
7b2259b3 CL	60	static inline int migrate_vmas(struct mm_struct *mm,
	61	const nodemask_t from, const nodemask_t to,
	62	unsigned long flags)
	63	{
	64	return -ENOSYS;
	65	}
	66
290408d4 NH	67	static inline void migrate_page_copy(struct page *newpage,
	68	struct page *page) {}
	69
6f39ce05	70	static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
290408d4 NH	71	struct page newpage, struct page page)
	72	{
	73	return -ENOSYS;
	74	}
	75
b20a3503 CL	76	/* Possible settings for the migrate_page() method in address_operations */
	77	#define migrate_page NULL
	78	#define fail_migrate_page NULL
	79
	80	#endif /* CONFIG_MIGRATION */
	81	#endif /* _LINUX_MIGRATE_H */