devread
devread(devfd, sblock, (daddr_t)(BBSIZE / DEV_BSIZE),
devread(devfd, buf, blk, fs->fs_bsize, "inode");
devread(devfd, buf, blk, fs->fs_bsize, "indirect block");
static void devread(int, void *, daddr_t, size_t, char *);
if (devread(devfd, mbr, MBR_BBSECTOR, DEV_BSIZE, "MBR") != 0)
if (devread(devfd, boot00, 1, DEV_BSIZE, "start/size") != 0)
int devread(int, void *, daddr_t, size_t, char *);