init commit

pkg/scsi/backingstore.go

@@ -0,0 +1,76 @@
+/*
+Copyright 2015 The GoStor Authors All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package scsi
+
+import "fmt"
+
+type BaseBackingStore struct {
+	Name            string
+	DataSize        int
+	OflagsSupported int
+}
+
+type BackingStore interface {
+	Open(dev *SCSILu, path string, fd *int, size *uint64) error
+	Close(dev *SCSILu) error
+	Init(dev *SCSILu, Opts string) error
+	Exit(dev *SCSILu) error
+	CommandSubmit(cmd *SCSICommand) error
+}
+
+type BackingStoreFunc func() (BackingStore, error)
+
+var registeredPlugins = map[name](BackingStoreFunc){}
+
+func RegisterBackingStore(name string, f BackingStoreFunc) {
+	registeredPlugins[name] = f
+}
+
+func NewBackingStore(name string) (BackingStore, error) {
+	if name == "" {
+		return nil, nil
+	}
+	f, ok := registeredPlugins[name]
+	if !ok {
+		return nil, fmt.Errorf("BackingStore %s is not found.", name)
+	}
+	return f()
+}
+
+type fakeBackingStore struct {
+	BaseBackingStore
+}
+
+func (fake *fakeBackingStore) Open(dev *SCSILu, path string, fd *int, size *uint64) error {
+	return nil
+}
+
+func (fake *fakeBackingStore) Close(dev *SCSILu) error {
+	return nil
+}
+
+func (fake *fakeBackingStore) Init(dev *SCSILu, Opts string) error {
+	return nil
+}
+
+func (fake *fakeBackingStore) Exit(dev *SCSILu) error {
+	return nil
+}
+
+func (fake *fakeBackingStore) CommandSubmit(cmd *SCSICommand) error {
+	return nil
+}