NBDAMAGIC
bb->bb_magic = (blk == 0) ? NBDAMAGIC : AHDIMAGIC;
if (((p[0] == NBDAMAGIC && blkno == 0) ||
if (((p[0] == NBDAMAGIC && offset == 0 &&
if (bb->bb_magic == NBDAMAGIC || bb->bb_magic == AHDIMAGIC) {
if ( ( (p[0] == NBDAMAGIC && offset == 0)
if ((offs == 0 && bb.bb_magic != NBDAMAGIC) ||
magic = NBDAMAGIC;
if ( ( (p[0] == NBDAMAGIC && offset == 0)
if ( ( (p[0] == NBDAMAGIC && offset == 0)