drvwrite
int drvwrite(struct dsk *dskp, void *buf, daddr_t lba, unsigned nblk);
int drvwrite(struct dsk *dskp, void *buf, daddr_t lba, unsigned nblk);
if (drvwrite(dskp, secbuf, slba, 1)) {
if (drvwrite(dskp, secbuf, hdr->hdr_lba_self, 1))
if (drvwrite(dskp, secbuf, slba, 1)) {
if (drvwrite(dskp, secbuf, hdr->hdr_lba_self, 1)) {