Commit f087b903 authored by Matthew Wilcox (Oracle)'s avatar Matthew Wilcox (Oracle)
Browse files

mm: Add folio_pgoff() 



This is the folio equivalent of page_to_pgoff().

Signed-off-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
parent 346cf613

include/linux/pagemap.h

+11 −0
Original line number Diff line number Diff line
@@ -817,6 +817,17 @@ static inline loff_t folio_file_pos(struct folio *folio) 
	return page_file_offset(&folio->page);

}



/*

 * Get the offset in PAGE_SIZE (even for hugetlb folios).

 * (TODO: hugetlb folios should have ->index in PAGE_SIZE)

 */

static inline pgoff_t folio_pgoff(struct folio *folio)

{

	if (unlikely(folio_test_hugetlb(folio)))

		return hugetlb_basepage_index(&folio->page);

	return folio->index;

}



extern pgoff_t linear_hugepage_index(struct vm_area_struct *vma,

				     unsigned long address);