mmb_has_buffers
EXPORT_SYMBOL_GPL(mmb_has_buffers);
if (!mmb_has_buffers(mmb))
if (mmb_has_buffers(mmb)) {
if (mmb_has_buffers(&EXT4_I(inode)->i_metadata_bhs))
bool mmb_has_buffers(struct mapping_metadata_bhs *mmb);