mapping lun and fix portal management

pkg/scsi/scsilumap.go

@@ -0,0 +1,89 @@
+/*
+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 (
+	"errors"
+	"strconv"
+	"sync"
+
+	"github.com/gostor/gotgt/pkg/api"
+	"github.com/gostor/gotgt/pkg/config"
+)
+
+type BackendType string
+
+type SCSILUMap struct {
+	mutex         sync.RWMutex
+	AllDevices    api.LUNMap            /* use UUID as the key for all LUs*/
+	TargetsLUNMap map[string]api.LUNMap /* use target name as the key for target's LUN map*/
+}
+
+var globalSCSILUMap = SCSILUMap{AllDevices: make(api.LUNMap), TargetsLUNMap: make(map[string]api.LUNMap)}
+
+func mappingLUN(deviceID uint64, lun uint64, target string) {
+
+	device := globalSCSILUMap.AllDevices[deviceID]
+	lunMap := globalSCSILUMap.TargetsLUNMap[target]
+	if lunMap == nil {
+		globalSCSILUMap.TargetsLUNMap[target] = make(api.LUNMap)
+		lunMap = globalSCSILUMap.TargetsLUNMap[target]
+	}
+	lunMap[lun] = device
+}
+
+func GetLU(tgtName string, LUN uint64) *api.SCSILu {
+	globalSCSILUMap.mutex.RLock()
+	defer globalSCSILUMap.mutex.RUnlock()
+
+	lunMap := globalSCSILUMap.TargetsLUNMap[tgtName]
+	lun := lunMap[LUN]
+
+	return lun
+}
+
+func GetTargetLUNMap(tgtName string) api.LUNMap {
+	globalSCSILUMap.mutex.RLock()
+	defer globalSCSILUMap.mutex.RUnlock()
+
+	lunMap := globalSCSILUMap.TargetsLUNMap[tgtName]
+	return lunMap
+}
+
+func InitSCSILUMap(config *config.Config) error {
+	globalSCSILUMap.mutex.Lock()
+	defer globalSCSILUMap.mutex.Unlock()
+
+	for _, bs := range config.Storages {
+		lu, err := NewSCSILu(bs.DeviceID, bs.Path)
+		if err != nil {
+			return errors.New("Init SCSI LU map error.")
+		}
+		globalSCSILUMap.AllDevices[bs.DeviceID] = lu
+	}
+
+	for tgtName, tgt := range config.Targets {
+		for lunstr, deviceID := range tgt.LUNs {
+			lun, err := strconv.ParseUint(lunstr, 10, 64)
+			if err != nil {
+				return errors.New("LU Number must be a number")
+			}
+			mappingLUN(deviceID, lun, tgtName)
+		}
+	}
+	return nil
+}