IFREG
if (mode != IFREG && mode != IFDIR && mode != IFLNK)
case IFREG:
dp->di_mode = IFREG|0600;
case IFREG:
{"file", IFREG},
case IFREG:
case IFREG:
if(!((ino->di_mode & IFMT)==IFDIR || (ino->di_mode & IFMT)==IFREG ||
if (mode == IFREG || mode == IFDIR ||
if (mode == IFREG || mode == IFDIR ||
stp->st_mode = IFREG;
case IFREG:
mode |= IFREG;
mode |= IFREG;
case IFREG:
&& ((ip->di_mode&IFMT) == IFREG