pxd_t
pxd_t pxd;
3072 + xd*sizeof(pxd_t), sizeof(pxd_t), (char *)&pxd);
pxd_t *xd;
pxd_t s_ait2; /* 8: first extent of secondary
pxd_t s_aim2; /* 8: first extent of secondary
pxd_t s_logpxd; /* 8: inline log extent */
pxd_t s_fsckpxd; /* 8: inline fsck work space extent */
pxd_t s_xfsckpxd; /* 8: extendfs fsckpxd */
pxd_t s_xlogpxd; /* 8: extendfs logpxd */
pxd_t xd; /* 8: child extent descriptor */
pxd_t self; /* 8: self pxd */
pxd_t self; /* 8: self */
pxd_t di_ixpxd; /* 8: inode extent descriptor */
pxd_t inoext[EXTSPERIAG]; /* 1024: inode extent addresses */