Function dnode_buf_evict_async

freebsd/contrib/openzfs/module/zfs/dnode.c:1208–1247

}

static void
dnode_buf_evict_async(void *dbu)
{
	dnode_children_t *dnc = dbu;

	DNODE_STAT_BUMP(dnode_buf_evict);

	for (int i = 0; i < dnc->dnc_count; i++) {
		dnode_handle_t *dnh = &dnc->dnc_children[i];
		dnode_t *dn;

		/*
		 * The dnode handle lock guards against the dnode moving to
		 * another valid address, so there is no need here to guard
		 * against changes to or from NULL.
		 */
		if (!DN_SLOT_IS_PTR(dnh->dnh_dnode)) {
			zrl_destroy(&dnh->dnh_zrlock);
			dnh->dnh_dnode = DN_SLOT_UNINIT;
			continue;
		}

		zrl_add(&dnh->dnh_zrlock);
		dn = dnh->dnh_dnode;
		/*
		 * If there are holds on this dnode, then there should
		 * be holds on the dnode's containing dbuf as well; thus
		 * it wouldn't be eligible for eviction and this function
		 * would not have been called.
		 */
		ASSERT(zfs_refcount_is_zero(&dn->dn_holds));
		ASSERT(zfs_refcount_is_zero(&dn->dn_tx_holds));

		dnode_destroy(dn); /* implicit zrl_remove() for first slot */
		zrl_destroy(&dnh->dnh_zrlock);
		dnh->dnh_dnode = DN_SLOT_UNINIT;
	}
	kmem_free(dnc, sizeof (dnode_children_t) +
	    dnc->dnc_count * sizeof (dnode_handle_t));
}

/*
 * When the DNODE_MUST_BE_FREE flag is set, the "slots" parameter is used