BLKDEV_IOSIZE
bsize = BLKDEV_IOSIZE;
vap->va_blocksize = BLKDEV_IOSIZE;
rvap->va_blocksize = BLKDEV_IOSIZE;
pi->pi_bsize = MAX(BLKDEV_IOSIZE, pi->pi_secsize);
bsize = BLKDEV_IOSIZE;
bsize = BLKDEV_IOSIZE;
vap->va_blocksize = BLKDEV_IOSIZE;
pi->pi_bsize = BLKDEV_IOSIZE;
#ifndef BLKDEV_IOSIZE
vap->va_blocksize = BLKDEV_IOSIZE;
vap->va_blocksize = BLKDEV_IOSIZE;
vap->va_blocksize = BLKDEV_IOSIZE;