cgblk
cgblk.b_un.b_buf = bufp;
initbarea(&cgblk);
getblk(&cgblk, cgtod(&sblock, cg), sblock.fs_cgsize);
return (&cgblk);
flush(fswritefd, &cgblk);
free(cgblk.b_un.b_buf);
static struct bufarea cgblk; /* backup buffer for cylinder group blocks */
(char *)(&cgblk), sblock.fs_cgsize);
inosused = cgblk.cg_initediblk;
struct cg cgblk;
#define cgblk cg_un.cgblk