mm: Export migrate_page_move_mapping and migrate_page_copy

commit 1118dce773d84f39ebd51a9fe7261f9169cb056e upstream.

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

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

Signed-off-by: Willy Tarreau <w@1wt.eu>

diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index a405d3dc0f61f0bd9609a580e17c5bd14127e39a..e986927480668a0c001969c1f11ae80005a551da 100644 (file)
--- 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 a61500f2671fb27f664530b08fe2d371baeee677..2ee28c2be6a56a228f481545fc99fdf21a6ecad9 100644 (file)
--- 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