EXT2_TIND_BLOCK
#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
nr = i_data[EXT2_TIND_BLOCK];
i_data[EXT2_TIND_BLOCK] = 0;
case EXT2_TIND_BLOCK:
offsets[n++] = EXT2_TIND_BLOCK;