mapping_seek_hole_data
start_byte = mapping_seek_hole_data(inode->i_mapping,
data_end = mapping_seek_hole_data(inode->i_mapping, start_byte,
*hole_pos = mapping_seek_hole_data(iter->inode->i_mapping,
*hole_pos = mapping_seek_hole_data(iter->inode->i_mapping,
loff_t mapping_seek_hole_data(struct address_space *, loff_t start, loff_t end,
offset = mapping_seek_hole_data(mapping, offset, inode->i_size, whence);