sm_erase_block
if (sm_erase_block(ftl, zone, block, 0))
sm_erase_block(ftl, zone, block, 1);
sm_erase_block(ftl, zone_num, block, 1);
sm_erase_block(ftl, zone_num, block_num, 1);
static int sm_erase_block(struct sm_ftl *ftl, int zone_num, uint16_t block,