ext2_check_sb_compat
static int ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev,
if (ext2_check_sb_compat(fs->e2fs, devvp->v_rdev, 0))
if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) {
if (ext2_check_sb_compat(es, dev, ronly) != 0) {