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>
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@ -55,6 +55,9 @@ extern int migrate_vmas(struct mm_struct *mm,
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extern void migrate_page_copy(struct page *newpage, struct page *page);
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extern int migrate_huge_page_move_mapping(struct address_space *mapping,
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struct page *newpage, struct page *page);
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extern int migrate_page_move_mapping(struct address_space *mapping,
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struct page *newpage, struct page *page,
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struct buffer_head *head, enum migrate_mode mode);
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#else
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static inline void putback_lru_pages(struct list_head *l) {}
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@ -414,6 +414,7 @@ static int migrate_page_move_mapping(struct address_space *mapping,
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return MIGRATEPAGE_SUCCESS;
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}
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EXPORT_SYMBOL(migrate_page_move_mapping);
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/*
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* The expected number of remaining references is the same as that
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@ -505,6 +506,7 @@ void migrate_page_copy(struct page *newpage, struct page *page)
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if (PageWriteback(newpage))
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end_page_writeback(newpage);
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}
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EXPORT_SYMBOL(migrate_page_copy);
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/************************************************************
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* Migration functions
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