if (block!=0 && block2!=0 && block==block2 && !(extent==extent2 && i==j))
{
printf("Error: Multiple allocated block (extent=%d,%d, name=\"%s\"",extent,extent2,prfile(sb,extent));
if (block!=0 && block2!=0 && block==block2 && !(extent==extent2 && i==j))
{
printf("Error: Multiple allocated block (extent=%d,%d, name=\"%s\"",extent,extent2,prfile(sb,extent));