Function dsl_dataset_create_sync

freebsd/contrib/openzfs/module/zfs/dsl_dataset.c:1273–1345

}

uint64_t
dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname,
    dsl_dataset_t *origin, uint64_t flags, cred_t *cr,
    dsl_crypto_params_t *dcp, dmu_tx_t *tx)
{
	dsl_pool_t *dp = pdd->dd_pool;
	uint64_t dsobj, ddobj;
	dsl_dir_t *dd;

	ASSERT(dmu_tx_is_syncing(tx));
	ASSERT(lastname[0] != '@');
	/*
	 * Filesystems will eventually have their origin set to dp_origin_snap,
	 * but that's taken care of in dsl_dataset_create_sync_dd. When
	 * creating a filesystem, this function is called with origin equal to
	 * NULL.
	 */
	if (origin != NULL)
		ASSERT3P(origin, !=, dp->dp_origin_snap);

	ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx);
	VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd));

	dsobj = dsl_dataset_create_sync_dd(dd, origin, dcp,
	    flags & ~DS_CREATE_FLAG_NODIRTY, tx);

	dsl_deleg_set_create_perms(dd, tx, cr);

	/*
	 * If we are creating a clone and the livelist feature is enabled,
	 * add the entry DD_FIELD_LIVELIST to ZAP.
	 */
	if (origin != NULL &&
	    spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LIVELIST)) {
		objset_t *mos = dd->dd_pool->dp_meta_objset;
		dsl_dir_zapify(dd, tx);
		uint64_t obj = dsl_deadlist_alloc(mos, tx);
		VERIFY0(zap_add(mos, dd->dd_object, DD_FIELD_LIVELIST,
		    sizeof (uint64_t), 1, &obj, tx));
		spa_feature_incr(dp->dp_spa, SPA_FEATURE_LIVELIST, tx);
	}

	/*
	 * Since we're creating a new node we know it's a leaf, so we can
	 * initialize the counts if the limit feature is active.
	 */
	if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) {
		uint64_t cnt = 0;
		objset_t *os = dd->dd_pool->dp_meta_objset;

		dsl_dir_zapify(dd, tx);
		VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT,
		    sizeof (cnt), 1, &cnt, tx));
		VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT,
		    sizeof (cnt), 1, &cnt, tx));
	}

	dsl_dir_rele(dd, FTAG);