Function dnode_setdirty

freebsd/contrib/openzfs/module/zfs/dnode.c:1655–1719

}

void
dnode_setdirty(dnode_t *dn, dmu_tx_t *tx)
{
	objset_t *os = dn->dn_objset;
	uint64_t txg = tx->tx_txg;

	if (DMU_OBJECT_IS_SPECIAL(dn->dn_object)) {
		dsl_dataset_dirty(os->os_dsl_dataset, tx);
		return;
	}

	DNODE_VERIFY(dn);

#ifdef ZFS_DEBUG
	mutex_enter(&dn->dn_mtx);
	ASSERT(dn->dn_phys->dn_type || dn->dn_allocated_txg);
	ASSERT(dn->dn_free_txg == 0 || dn->dn_free_txg >= txg);
	mutex_exit(&dn->dn_mtx);
#endif

	/*
	 * Determine old uid/gid when necessary
	 */
	dmu_objset_userquota_get_ids(dn, B_TRUE, tx);

	multilist_t *dirtylist = os->os_dirty_dnodes[txg & TXG_MASK];
	multilist_sublist_t *mls = multilist_sublist_lock_obj(dirtylist, dn);

	/*
	 * If we are already marked dirty, we're done.
	 */
	if (multilist_link_active(&dn->dn_dirty_link[txg & TXG_MASK])) {
		multilist_sublist_unlock(mls);
		return;
	}

	ASSERT(!zfs_refcount_is_zero(&dn->dn_holds) ||
	    !avl_is_empty(&dn->dn_dbufs));
	ASSERT(dn->dn_datablksz != 0);
	ASSERT0(dn->dn_next_bonuslen[txg & TXG_MASK]);
	ASSERT0(dn->dn_next_blksz[txg & TXG_MASK]);
	ASSERT0(dn->dn_next_bonustype[txg & TXG_MASK]);

	dprintf_ds(os->os_dsl_dataset, "obj=%llu txg=%llu\n",
	    dn->dn_object, txg);

	multilist_sublist_insert_head(mls, dn);

	multilist_sublist_unlock(mls);

	/*
	 * The dnode maintains a hold on its containing dbuf as
	 * long as there are holds on it.  Each instantiated child
	 * dbuf maintains a hold on the dnode.  When the last child
	 * drops its hold, the dnode will drop its hold on the
	 * containing dbuf. We add a "dirty hold" here so that the
	 * dnode will hang around after we finish processing its
	 * children.