di_rdev
spcl.c_rdev = dp->dp1.di_rdev;
spcl.c_rdev = dp->dp2.di_rdev;
(int)major(DIP(dp, di_rdev)), (int)minor(DIP(dp, di_rdev)));
(int)major(DIP(dp, di_rdev)), (int)minor(DIP(dp, di_rdev)));
#define i_ffs1_rdev i_din1->di_rdev
#define i_ffs2_rdev i_din2->di_rdev
#define i_rdev i_din1->di_rdev
dinp->di_rdev = cur->inode->st.st_rdev;
dinp->di_rdev = cur->inode->st.st_rdev;
#define i_ffs1_rdev i_din.ffs1_din.di_rdev
#define i_ffs2_rdev i_din.ffs2_din.di_rdev