SD_TGTBLOCKS2BYTES
resid = SD_TGTBLOCKS2BYTES(un,
shadow_start = SD_TGTBLOCKS2BYTES(un, (offset_t)xp->xb_blkno);
bytes_issued), SD_TGTBLOCKS2BYTES(un, UINT32_MAX));
(SD_SYSBLOCKS2BYTES(sysblk) - SD_TGTBLOCKS2BYTES(un, tgtblk))