mm: Export migrate_page_move_mapping and migrate_page_copy

[pandora-kernel.git] / include / linux / migrate.h

diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 085527f..40044bd 100644 (file)
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -6,16 +6,31 @@
 
 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 *);
+                       struct page *, struct page *, enum migrate_mode);
 extern int migrate_pages(struct list_head *l, new_page_t x,
-                       unsigned long private, int offlining);
+                       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, int offlining);
+                       unsigned long private, bool offlining,
+                       enum migrate_mode mode);
 
 extern int fail_migrate_page(struct address_space *,
                        struct page *, struct page *);
@@ -28,14 +43,19 @@ extern int migrate_vmas(struct mm_struct *mm,
 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);
+extern int migrate_page_move_mapping(struct address_space *mapping,
+               struct page *newpage, struct page *page,
+               struct buffer_head *head, enum migrate_mode mode);
 #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, int offlining) { return -ENOSYS; }
+               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, int offlining) { return -ENOSYS; }
+               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; }