introduce MaxStagingDealsGiB - reject new deals if our staging deals area is "full"

node/config/doc_gen.go

@@ -251,6 +251,13 @@ message`,
 
 			Comment: `The maximum collateral that the provider will put up against a deal,
 as a multiplier of the minimum collateral bound`,
+		},
+		{
+			Name: "MaxStagingDealsGiB",
+			Type: "int64",
+
+			Comment: `The maximum size of staging deals not yet passed to the sealing node,
+that the markets service can accept`,
 		},
 		{
 			Name: "SimultaneousTransfers",

node/config/types.go

@@ -126,7 +126,9 @@ type DealmakingConfig struct {
 	// The maximum collateral that the provider will put up against a deal,
 	// as a multiplier of the minimum collateral bound
 	MaxProviderCollateralMultiplier uint64
-
+	// The maximum size of staging deals not yet passed to the sealing node,
+	// that the markets service can accept
+	MaxStagingDealsGiB int64
 	// The maximum number of parallel online data transfers (storage+retrieval)
 	SimultaneousTransfers uint64