ext2fs_alloc
error = ext2fs_alloc(ip, lbn, pref, cred, &newb);
error = ext2fs_alloc(ip, lbn, pref, cred, &newb);
error = ext2fs_alloc(ip, lbn, pref, cred, &newb);
error = ext2fs_alloc(ip, bn,
int ext2fs_alloc(struct inode *, u_int32_t, u_int32_t , struct ucred *,