Function dmu_objset_create_sync

freebsd/contrib/openzfs/module/zfs/dmu_objset.c:1189–1276

}

static void
dmu_objset_create_sync(void *arg, dmu_tx_t *tx)
{
	dmu_objset_create_arg_t *doca = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	spa_t *spa = dp->dp_spa;
	dsl_dir_t *pdd;
	const char *tail;
	dsl_dataset_t *ds;
	uint64_t obj;
	blkptr_t *bp;
	objset_t *os;
	zio_t *rzio;

	VERIFY0(dsl_dir_hold(dp, doca->doca_name, FTAG, &pdd, &tail));

	obj = dsl_dataset_create_sync(pdd, tail, NULL, doca->doca_flags,
	    doca->doca_cred, doca->doca_dcp, tx);

	VERIFY0(dsl_dataset_hold_obj_flags(pdd->dd_pool, obj,
	    DS_HOLD_FLAG_DECRYPT, FTAG, &ds));
	rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
	bp = dsl_dataset_get_blkptr(ds);
	os = dmu_objset_create_impl(spa, ds, bp, doca->doca_type, tx);
	rrw_exit(&ds->ds_bp_rwlock, FTAG);

	if (doca->doca_userfunc != NULL) {
		doca->doca_userfunc(os, doca->doca_userarg,
		    doca->doca_cred, tx);
	}

	/*
	 * The doca_userfunc() may write out some data that needs to be
	 * encrypted if the dataset is encrypted (specifically the root
	 * directory).  This data must be written out before the encryption
	 * key mapping is removed by dsl_dataset_rele_flags().  Force the
	 * I/O to occur immediately by invoking the relevant sections of
	 * dsl_pool_sync().
	 */
	if (os->os_encrypted) {
		dsl_dataset_t *tmpds = NULL;
		boolean_t need_sync_done = B_FALSE;

		mutex_enter(&ds->ds_lock);
		ds->ds_owner = FTAG;
		mutex_exit(&ds->ds_lock);

		rzio = zio_root(spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED);
		tmpds = txg_list_remove_this(&dp->dp_dirty_datasets, ds,
		    tx->tx_txg);
		if (tmpds != NULL) {
			dsl_dataset_sync(ds, rzio, tx);
			need_sync_done = B_TRUE;
		}
		VERIFY0(zio_wait(rzio));

		dmu_objset_sync_done(os, tx);
		taskq_wait(dp->dp_sync_taskq);