Use readQuorum instead of writeQuorum to check bucket exists (#5715)

Fixes #5708
Fixes #5700

cmd/admin-heal-ops.go

@@ -217,9 +217,9 @@ func (ahs *allHealState) LaunchNewHealSequence(h *healSequence) (
 	}()
 
 	b, err := json.Marshal(madmin.HealStartSuccess{
-		h.clientToken,
-		h.clientAddress,
-		h.startTime,
+		ClientToken:   h.clientToken,
+		ClientAddress: h.clientAddress,
+		StartTime:     h.startTime,
 	})
 	if err != nil {
 		errorIf(err, "Failed to marshal heal result into json.")

cmd/xl-sets.go

@@ -1105,7 +1105,7 @@ func (s *xlSets) HealBucket(ctx context.Context, bucket string, dryRun bool) (re
 
 	// Check if we had quorum to write, if not return an appropriate error.
 	_, afterDriveOnline := res.GetOnlineCounts()
-	if afterDriveOnline < s.setCount*s.drivesPerSet/2+1 {
+	if afterDriveOnline < ((s.setCount*s.drivesPerSet)/2)+1 {
 		return nil, toObjectErr(errXLWriteQuorum, bucket)
 	}
 

cmd/xl-v1-healing.go

@@ -49,8 +49,8 @@ func checkBucketExistsInQuorum(storageDisks []StorageAPI, bucketName string) (er
 	}
 	wg.Wait()
 
-	writeQuorum := len(storageDisks)/2 + 1
-	return reduceWriteQuorumErrs(errs, nil, writeQuorum)
+	readQuorum := len(storageDisks) / 2
+	return reduceWriteQuorumErrs(errs, nil, readQuorum)
 }
 
 // Heals a bucket if it doesn't exist on one of the disks, additionally