Commit 352b47a6 authored by Matthew Wilcox (Oracle)'s avatar Matthew Wilcox (Oracle)
Browse files

mm/filemap: Add folio_pos() and folio_file_pos() 



These are just wrappers around page_offset() and page_file_offset()
respectively.  No change to generated code.

Signed-off-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Acked-by: default avatarJeff Layton <jlayton@kernel.org>
Acked-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
Reviewed-by: default avatarWilliam Kucharski <william.kucharski@oracle.com>
Reviewed-by: default avatarDavid Howells <dhowells@redhat.com>
parent f94b18f6

include/linux/pagemap.h

+21 −0
Original line number Diff line number Diff line
@@ -561,6 +561,27 @@ static inline loff_t page_file_offset(struct page *page) 
	return ((loff_t)page_index(page)) << PAGE_SHIFT;

}



/**

 * folio_pos - Returns the byte position of this folio in its file.

 * @folio: The folio.

 */

static inline loff_t folio_pos(struct folio *folio)

{

	return page_offset(&folio->page);

}



/**

 * folio_file_pos - Returns the byte position of this folio in its file.

 * @folio: The folio.

 *

 * This differs from folio_pos() for folios which belong to a swap file.

 * NFS is the only filesystem today which needs to use folio_file_pos().

 */

static inline loff_t folio_file_pos(struct folio *folio)

{

	return page_file_offset(&folio->page);

}



extern pgoff_t linear_hugepage_index(struct vm_area_struct *vma,

				     unsigned long address);