Function zdb_count_block

freebsd/contrib/openzfs/cmd/zdb/zdb.c:5057–5199

}

static void
zdb_count_block(zdb_cb_t *zcb, zilog_t *zilog, const blkptr_t *bp,
    dmu_object_type_t type)
{
	uint64_t refcnt = 0;
	int i;

	ASSERT(type < ZDB_OT_TOTAL);

	if (zilog && zil_bp_tree_add(zilog, bp) != 0)
		return;

	spa_config_enter(zcb->zcb_spa, SCL_CONFIG, FTAG, RW_READER);

	for (i = 0; i < 4; i++) {
		int l = (i < 2) ? BP_GET_LEVEL(bp) : ZB_TOTAL;
		int t = (i & 1) ? type : ZDB_OT_TOTAL;
		int equal;
		zdb_blkstats_t *zb = &zcb->zcb_type[l][t];

		zb->zb_asize += BP_GET_ASIZE(bp);
		zb->zb_lsize += BP_GET_LSIZE(bp);
		zb->zb_psize += BP_GET_PSIZE(bp);
		zb->zb_count++;

		/*
		 * The histogram is only big enough to record blocks up to
		 * SPA_OLD_MAXBLOCKSIZE; larger blocks go into the last,
		 * "other", bucket.
		 */
		unsigned idx = BP_GET_PSIZE(bp) >> SPA_MINBLOCKSHIFT;
		idx = MIN(idx, SPA_OLD_MAXBLOCKSIZE / SPA_MINBLOCKSIZE + 1);
		zb->zb_psize_histogram[idx]++;

		zb->zb_gangs += BP_COUNT_GANG(bp);

		switch (BP_GET_NDVAS(bp)) {
		case 2:
			if (DVA_GET_VDEV(&bp->blk_dva[0]) ==
			    DVA_GET_VDEV(&bp->blk_dva[1])) {
				zb->zb_ditto_samevdev++;

				if (same_metaslab(zcb->zcb_spa,
				    DVA_GET_VDEV(&bp->blk_dva[0]),
				    DVA_GET_OFFSET(&bp->blk_dva[0]),
				    DVA_GET_OFFSET(&bp->blk_dva[1])))
					zb->zb_ditto_same_ms++;
			}
			break;
		case 3:
			equal = (DVA_GET_VDEV(&bp->blk_dva[0]) ==
			    DVA_GET_VDEV(&bp->blk_dva[1])) +
			    (DVA_GET_VDEV(&bp->blk_dva[0]) ==
			    DVA_GET_VDEV(&bp->blk_dva[2])) +
			    (DVA_GET_VDEV(&bp->blk_dva[1]) ==
			    DVA_GET_VDEV(&bp->blk_dva[2]));
			if (equal != 0) {
				zb->zb_ditto_samevdev++;