  We investigate here gravitational collapse of a perfect fluid with a linear
isentropic equation of state $p = k \rho$. A class of collapse models is given
which is a family of solutions to Einstein equations and the final fate of
collapse is analyzed in terms of the formation of black holes and naked
singularities. The collapse evolves from a regular initial data and the
positivity of energy conditions and other physical regularity conditions are
satisfied. As we provided here an explicit class, this gives useful insights
into the endstates of collapse with a physically reasonable and relevant
equation of state and for the cosmic censorship hypothesis.
