diReadSpecial
ip = diReadSpecial(sb, FILESYSTEM_I, 1);
extern struct inode *diReadSpecial(struct super_block *, ino_t, int);
ipbmap = diReadSpecial(sb, BMAP_I, 0);
ipaimap2 = diReadSpecial(sb, AGGREGATE_I, 1);
ipimap = diReadSpecial(sb, FILESYSTEM_I, 0);
ipaimap = diReadSpecial(sb, AGGREGATE_I, 0);
ipbmap2 = diReadSpecial(sb, BMAP_I, 1);