Function vdev_draid_cksum_finish

freebsd/contrib/openzfs/module/zfs/vdev_draid.c:661–801

}

static void
vdev_draid_cksum_finish(zio_cksum_report_t *zcr, const abd_t *good_data)
{
	raidz_map_t *rm = zcr->zcr_cbdata;
	const size_t c = zcr->zcr_cbinfo;
	uint64_t skip_size = zcr->zcr_sector;
	uint64_t parity_size;
	size_t x, offset, size;

	if (good_data == NULL) {
		zfs_ereport_finish_checksum(zcr, NULL, NULL, B_FALSE);
		return;
	}

	/*
	 * Detailed cksum reporting is currently only supported for single
	 * row draid mappings, this covers the vast majority of zios. Only
	 * a dRAID zio which spans groups will have multiple rows.
	 */
	if (rm->rm_nrows != 1) {
		zfs_ereport_finish_checksum(zcr, NULL, NULL, B_FALSE);
		return;
	}

	raidz_row_t *rr = rm->rm_row[0];
	const abd_t *good = NULL;
	const abd_t *bad = rr->rr_col[c].rc_abd;

	if (c < rr->rr_firstdatacol) {
		/*
		 * The first time through, calculate the parity blocks for
		 * the good data (this relies on the fact that the good
		 * data never changes for a given logical zio)
		 */
		if (rr->rr_col[0].rc_gdata == NULL) {
			abd_t *bad_parity[VDEV_DRAID_MAXPARITY];

			/*
			 * Set up the rr_col[]s to generate the parity for
			 * good_data, first saving the parity bufs and
			 * replacing them with buffers to hold the result.
			 */
			for (x = 0; x < rr->rr_firstdatacol; x++) {
				bad_parity[x] = rr->rr_col[x].rc_abd;
				rr->rr_col[x].rc_abd = rr->rr_col[x].rc_gdata =
				    abd_alloc_sametype(rr->rr_col[x].rc_abd,
				    rr->rr_col[x].rc_size);
			}

			/*
			 * Fill in the data columns from good_data being
			 * careful to pad short columns and empty columns
			 * with a skip sector.
			 */
			uint64_t good_size = abd_get_size((abd_t *)good_data);

			offset = 0;
			for (; x < rr->rr_cols; x++) {