udf: Use a folio in udf_write_end()

Convert the page to a folio and use the folio APIs.  Replaces three
calls to compound_head() with one.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Message-Id: <20240417150416.752929-8-willy@infradead.org>

fs/udf/inode.c

@@ -276,17 +276,19 @@ static int udf_write_end(struct file *file, struct address_space *mapping,
 			 struct page *page, void *fsdata)
 {
 	struct inode *inode = file_inode(file);
+	struct folio *folio;
 	loff_t last_pos;
 
 	if (UDF_I(inode)->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB)
 		return generic_write_end(file, mapping, pos, len, copied, page,
 					 fsdata);
+	folio = page_folio(page);
 	last_pos = pos + copied;
 	if (last_pos > inode->i_size)
 		i_size_write(inode, last_pos);
-	set_page_dirty(page);
-	unlock_page(page);
-	put_page(page);
+	folio_mark_dirty(folio);
+	folio_unlock(folio);
+	folio_put(folio);
 
 	return copied;
 }