blog_get_file_system_fragmentation.c

int main (int argc, char **argv)
{
    int fd, i, block, blocksize, bcount, prev_block, frag_count=0;
    struct stat st;
    assert (argv[1] != NULL);
    assert (fd = open (argv[1], O_RDONLY));
    assert (ioctl (fd, FIGETBSZ, &blocksize) == 0);
    assert (!fstat (fd, &st));
    bcount = (st.st_size + blocksize - 1) / blocksize;
    printf ("File: %s Size: %d Blocks: %d Blocksize: %d\n",
        argv[1], st.st_size, bcount, blocksize);
    for (i = 0; i < bcount; i++)
      {
          block = i;
          if (ioctl (fd, FIBMAP, &block))
            {
                printf ("FIBMAP ioctl failed - errno: %s\n",
                    strerror (errno));
            }
            if(block != (prev_block + 1)){
                frag_count++;
                  printf ("\n\033[31m %3d %10d \033[0;39m \n", i, block);
                fprintf(stderr, "\n\033[31m %3d %10d \033[0;39m \n", i, block);
            }
            else
                printf("\r\033[1;36m %3d %10d \033[0;39m ", i, block);
            prev_block = block;
      }

printf("Number of fragmented blocks : %4d\n",frag_count);
    close (fd);
}