87 		{ '\0', "mssize", &zfs->mssize, OPT_INT64,  in zfs_prep_opts()
146 	off_t asize, mssize, vdevsize, vdevsize1;  in zfs_size_vdev()  local
178 	mssize = zfs->mssize;  in zfs_size_vdev()
179 	if (mssize == 0) {  in zfs_size_vdev()
180 		mssize = MAX(MIN(asize / 8, DFLTMSSIZE), MINMSSIZE);  in zfs_size_vdev()
181 		if (!powerof2(mssize))  in zfs_size_vdev()
182 			mssize = 1l << (flsll(mssize) - 1);  in zfs_size_vdev()
184 	if (!powerof2(mssize))  in zfs_size_vdev()
191 	if (asize % mssize != 0) {  in zfs_size_vdev()
192 		vdevsize1 = rounddown2(asize, mssize) + VDEV_LABEL_SPACE;  in zfs_size_vdev()
194 			vdevsize1 = roundup2(asize, mssize) + VDEV_LABEL_SPACE;  in zfs_size_vdev()
202 	zfs->mssize = mssize;  in zfs_size_vdev()
203 	zfs->msshift = flsll(mssize) - 1;  in zfs_size_vdev()
204 	zfs->mscount = asize / mssize;  in zfs_size_vdev()