[PATCH 3.10 117/180] mm: Export migrate_page_move_mapping and migrate_page_copy

[Willy Tarreau]

From: Richard Weinberger <richard@xxxxxx>

commit 1118dce773d84f39ebd51a9fe7261f9169cb056e upstream.

Export these symbols such that UBIFS can implement
->migratepage.

Signed-off-by: Richard Weinberger <richard@xxxxxx>
Acked-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
[wt: also add the prototype to include/linux/migrate.h]

Signed-off-by: Willy Tarreau <w@xxxxxx>
---
 include/linux/migrate.h | 3 +++
 mm/migrate.c            | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index a405d3dc..e986927 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -55,6 +55,9 @@ 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
 
 static inline void putback_lru_pages(struct list_head *l) {}
diff --git a/mm/migrate.c b/mm/migrate.c
index a61500f..2ee28c2 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -412,6 +412,7 @@ static int migrate_page_move_mapping(struct address_space *mapping,
 
 	return MIGRATEPAGE_SUCCESS;
 }
+EXPORT_SYMBOL(migrate_page_move_mapping);
 
 /*
  * The expected number of remaining references is the same as that
@@ -503,6 +504,7 @@ void migrate_page_copy(struct page *newpage, struct page *page)
 	if (PageWriteback(newpage))
 		end_page_writeback(newpage);
 }
+EXPORT_SYMBOL(migrate_page_copy);
 
 /************************************************************
  *                    Migration functions
-- 
2.8.0.rc2.1.gbe9624a