f2fs: Convert __read_io_type() to take a folio

Remove the last call to page_file_mapping() as both callers can now pass
in a folio.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Author: Matthew Wilcox (Oracle)

fs/f2fs/data.c

@@ -70,9 +70,9 @@ bool f2fs_is_cp_guaranteed(struct page *page)
 	return false;
 }
 
-static enum count_type __read_io_type(struct page *page)
+static enum count_type __read_io_type(struct folio *folio)
 {
-	struct address_space *mapping = page_file_mapping(page);
+	struct address_space *mapping = folio->mapping;
 
 	if (mapping) {
 		struct inode *inode = mapping->host;
@@ -150,7 +150,7 @@ static void f2fs_finish_read_bio(struct bio *bio, bool in_task)
 			continue;
 		}
 
-		dec_page_count(F2FS_F_SB(folio), __read_io_type(&folio->page));
+		dec_page_count(F2FS_F_SB(folio), __read_io_type(folio));
 		folio_end_read(folio, bio->bi_status == 0);
 	}
 
@@ -706,7 +706,7 @@ int f2fs_submit_page_bio(struct f2fs_io_info *fio)
 		wbc_account_cgroup_owner(fio->io_wbc, fio_folio, PAGE_SIZE);
 
 	inc_page_count(fio->sbi, is_read_io(fio->op) ?
-			__read_io_type(&data_folio->page) : WB_DATA_TYPE(fio->page, false));
+			__read_io_type(data_folio) : WB_DATA_TYPE(fio->page, false));
 
 	if (is_read_io(bio_op(bio)))
 		f2fs_submit_read_bio(fio->sbi, bio, fio->type);