Function mb_free_notready

freebsd/kern/kern_mbuf.c:834–848

* Free "count" units of I/O from an mbuf chain. They could be held * in M_EXTPG or just as a normal mbuf. This code is intended to be * called in an error path (I/O error, closed connection, etc). */

 * called in an error path (I/O error, closed connection, etc).
 */
void
mb_free_notready(struct mbuf *m, int count)
{
	int i;

	for (i = 0; i < count && m != NULL; i++) {
		if ((m->m_flags & M_EXTPG) != 0) {
			m->m_epg_nrdy--;
			if (m->m_epg_nrdy != 0)
				continue;
		}
		m = m_free(m);
	}
	KASSERT(i == count, ("Removed only %d items from %p", i, m));
}

/*
 * Compress an unmapped mbuf into a simple mbuf when it holds a small