move volume vacuum to gRpc

weed/pb/volume_server.proto

@@ -8,6 +8,14 @@ service VolumeServer {
     //Experts only: takes multiple fid parameters. This function does not propagate deletes to replicas.
     rpc BatchDelete (BatchDeleteRequest) returns (BatchDeleteResponse) {
     }
+    rpc VacuumVolumeCheck (VacuumVolumeCheckRequest) returns (VacuumVolumeCheckResponse) {
+    }
+    rpc VacuumVolumeCompact (VacuumVolumeCompactRequest) returns (VacuumVolumeCompactResponse) {
+    }
+    rpc VacuumVolumeCommit (VacuumVolumeCommitRequest) returns (VacuumVolumeCommitResponse) {
+    }
+    rpc VacuumVolumeCleanup (VacuumVolumeCleanupRequest) returns (VacuumVolumeCleanupResponse) {
+    }
 }
 
 //////////////////////////////////////////////////
@@ -28,3 +36,29 @@ message DeleteResult {
 
 message Empty {
 }
+
+message VacuumVolumeCheckRequest {
+    uint32 volumd_id = 1;
+}
+message VacuumVolumeCheckResponse {
+    double garbage_ratio = 1;
+}
+
+message VacuumVolumeCompactRequest {
+    uint32 volumd_id = 1;
+    int64 preallocate = 2;
+}
+message VacuumVolumeCompactResponse {
+}
+
+message VacuumVolumeCommitRequest {
+    uint32 volumd_id = 1;
+}
+message VacuumVolumeCommitResponse {
+}
+
+message VacuumVolumeCleanupRequest {
+    uint32 volumd_id = 1;
+}
+message VacuumVolumeCleanupResponse {
+}