btrfs: convert submit_eb_page() to take a folio

The old page API is being gradually replaced and converted to use folio
to improve code readability and avoid repeated conversion between page
and folio.
Signed-off-by: Li Zetao <lizetao1@huawei.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/extent_io.c

@@ -1816,18 +1816,17 @@ static int submit_eb_subpage(struct folio *folio, struct writeback_control *wbc)
  * previous call.
  * Return <0 for fatal error.
  */
-static int submit_eb_page(struct page *page, struct btrfs_eb_write_context *ctx)
+static int submit_eb_page(struct folio *folio, struct btrfs_eb_write_context *ctx)
 {
 	struct writeback_control *wbc = ctx->wbc;
-	struct address_space *mapping = page->mapping;
-	struct folio *folio = page_folio(page);
+	struct address_space *mapping = folio->mapping;
 	struct extent_buffer *eb;
 	int ret;
 
 	if (!folio_test_private(folio))
 		return 0;
 
-	if (page_to_fs_info(page)->nodesize < PAGE_SIZE)
+	if (folio_to_fs_info(folio)->nodesize < PAGE_SIZE)
 		return submit_eb_subpage(folio, wbc);
 
 	spin_lock(&mapping->i_private_lock);
@@ -1926,7 +1925,7 @@ int btree_write_cache_pages(struct address_space *mapping,
 		for (i = 0; i < nr_folios; i++) {
 			struct folio *folio = fbatch.folios[i];
 
-			ret = submit_eb_page(&folio->page, &ctx);
+			ret = submit_eb_page(folio, &ctx);
 			if (ret == 0)
 				continue;
 			if (ret < 0) {