Function dmu_objset_sync

freebsd/contrib/openzfs/module/zfs/dmu_objset.c:1606–1736

called from dsl */

/* called from dsl */
void
dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx)
{
	int txgoff;
	zbookmark_phys_t zb;
	zio_prop_t zp;
	zio_t *zio;
	list_t *list;
	dbuf_dirty_record_t *dr;
	int num_sublists;
	multilist_t *ml;
	blkptr_t *blkptr_copy = kmem_alloc(sizeof (*os->os_rootbp), KM_SLEEP);
	*blkptr_copy = *os->os_rootbp;

	dprintf_ds(os->os_dsl_dataset, "txg=%llu\n", tx->tx_txg);

	ASSERT(dmu_tx_is_syncing(tx));
	/* XXX the write_done callback should really give us the tx... */
	os->os_synctx = tx;

	if (os->os_dsl_dataset == NULL) {
		/*
		 * This is the MOS.  If we have upgraded,
		 * spa_max_replication() could change, so reset
		 * os_copies here.
		 */
		os->os_copies = spa_max_replication(os->os_spa);
	}

	/*
	 * Create the root block IO
	 */
	SET_BOOKMARK(&zb, os->os_dsl_dataset ?
	    os->os_dsl_dataset->ds_object : DMU_META_OBJSET,
	    ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
	arc_release(os->os_phys_buf, &os->os_phys_buf);

	dmu_write_policy(os, NULL, 0, 0, &zp);

	/*
	 * If we are either claiming the ZIL or doing a raw receive, write
	 * out the os_phys_buf raw. Neither of these actions will effect the
	 * MAC at this point.
	 */
	if (os->os_raw_receive ||
	    os->os_next_write_raw[tx->tx_txg & TXG_MASK]) {
		ASSERT(os->os_encrypted);
		arc_convert_to_raw(os->os_phys_buf,
		    os->os_dsl_dataset->ds_object, ZFS_HOST_BYTEORDER,
		    DMU_OT_OBJSET, NULL, NULL, NULL);
	}

	zio = arc_write(pio, os->os_spa, tx->tx_txg,
	    blkptr_copy, os->os_phys_buf, DMU_OS_IS_L2CACHEABLE(os),
	    &zp, dmu_objset_write_ready, NULL, NULL, dmu_objset_write_done,
	    os, ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb);

	/*