change volume specs to int32 and define max iops and throughput values (#3139)

* change int64 volume specs to int32 like in used AWS lib
* upper iops and throughput limits
* minor refactoring in ebs.go

pkg/apis/acid.zalan.do/v1/postgresql.crd.yaml

@@ -3258,7 +3258,8 @@ spec:
                 description: Volume describes a single volume in the manifest.
                 properties:
                   iops:
-                    format: int64
+                    format: int32
+                    maximum: 80000
                     type: integer
                   isSubPathExpr:
                     type: boolean
@@ -3319,7 +3320,8 @@ spec:
                   subPath:
                     type: string
                   throughput:
-                    format: int64
+                    format: int32
+                    maximum: 2000
                     type: integer
                   type:
                     type: string

pkg/apis/acid.zalan.do/v1/postgresql_type.go

@@ -167,9 +167,11 @@ type Volume struct {
 	StorageClass  string `json:"storageClass,omitempty"`
 	SubPath       string `json:"subPath,omitempty"`
 	IsSubPathExpr *bool  `json:"isSubPathExpr,omitempty"`
-	Iops          *int64 `json:"iops,omitempty"`
-	Throughput    *int64 `json:"throughput,omitempty"`
-	VolumeType    string `json:"type,omitempty"`
+	// +kubebuilder:validation:Maximum=80000
+	Iops *int32 `json:"iops,omitempty"`
+	// +kubebuilder:validation:Maximum=2000
+	Throughput *int32 `json:"throughput,omitempty"`
+	VolumeType string `json:"type,omitempty"`
 }
 
 // AdditionalVolume specs additional optional volumes for statefulset

pkg/apis/acid.zalan.do/v1/zz_generated.deepcopy.go

@@ -1686,12 +1686,12 @@ func (in *Volume) DeepCopyInto(out *Volume) {
 	}
 	if in.Iops != nil {
 		in, out := &in.Iops, &out.Iops
-		*out = new(int64)
+		*out = new(int32)
 		**out = **in
 	}
 	if in.Throughput != nil {
 		in, out := &in.Throughput, &out.Throughput
-		*out = new(int64)
+		*out = new(int32)
 		**out = **in
 	}
 	return