From b2d5074d5d465930612c26de2ecabaf50024583d Mon Sep 17 00:00:00 2001 From: Richard Weinberger Date: Thu, 16 Jun 2016 23:26:14 +0200 Subject: [PATCH 1/1] 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 Acked-by: Christoph Hellwig [bwh: Backported to 3.2: also change migrate_page_move_mapping() from static to extern, done as part of an earlier commit upstream] Signed-off-by: Ben Hutchings --- include/linux/migrate.h | 3 +++ mm/migrate.c | 4 +++- 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/include/linux/migrate.h b/include/linux/migrate.h index eaf867412f7a..40044bdb60ef 100644 --- a/include/linux/migrate.h +++ b/include/linux/migrate.h @@ -43,6 +43,9 @@ 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 #define PAGE_MIGRATION 0 diff --git a/mm/migrate.c b/mm/migrate.c index 7d26ea580662..f2d86f2bd203 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -294,7 +294,7 @@ static inline bool buffer_migrate_lock_buffers(struct buffer_head *head, * 2 for pages with a mapping * 3 for pages with a mapping and PagePrivate/PagePrivate2 set. */ -static int migrate_page_move_mapping(struct address_space *mapping, +int migrate_page_move_mapping(struct address_space *mapping, struct page *newpage, struct page *page, struct buffer_head *head, enum migrate_mode mode) { @@ -377,6 +377,7 @@ static int migrate_page_move_mapping(struct address_space *mapping, return 0; } +EXPORT_SYMBOL(migrate_page_move_mapping); /* * The expected number of remaining references is the same as that @@ -476,6 +477,7 @@ void migrate_page_copy(struct page *newpage, struct page *page) if (PageWriteback(newpage)) end_page_writeback(newpage); } +EXPORT_SYMBOL(migrate_page_copy); /************************************************************ * Migration functions -- 2.39.2