Function prison_racct_modify

freebsd/kern/kern_jail.c:4317–4363

* Handle jail renaming. From the racct point of view, renaming means * moving from one prison_racct to another. */

 * moving from one prison_racct to another.
 */
static void
prison_racct_modify(struct prison *pr)
{
#ifdef RCTL
	struct proc *p;
	struct ucred *cred;
#endif
	struct prison_racct *oldprr;

	ASSERT_RACCT_ENABLED();

	sx_slock(&allproc_lock);
	sx_xlock(&allprison_lock);

	if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) {
		sx_xunlock(&allprison_lock);
		sx_sunlock(&allproc_lock);
		return;
	}

	oldprr = pr->pr_prison_racct;
	pr->pr_prison_racct = NULL;

	prison_racct_attach(pr);

	/*
	 * Move resource utilisation records.
	 */
	racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct);

#ifdef RCTL
	/*
	 * Force rctl to reattach rules to processes.
	 */
	FOREACH_PROC_IN_SYSTEM(p) {
		PROC_LOCK(p);
		cred = crhold(p->p_ucred);
		PROC_UNLOCK(p);
		rctl_proc_ucred_changed(p, cred);
		crfree(cred);
	}
#endif

	sx_sunlock(&allproc_lock);
	prison_racct_free_locked(oldprr);
	sx_xunlock(&allprison_lock);
}

static void
prison_racct_detach(struct prison *pr)