90 lines
2.3 KiB
Go
90 lines
2.3 KiB
Go
/*
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Copyright 2015 The GoStor Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package scsi
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import (
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"errors"
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"strconv"
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"sync"
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"github.com/gostor/gotgt/pkg/api"
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"github.com/gostor/gotgt/pkg/config"
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)
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type BackendType string
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type SCSILUMap struct {
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mutex sync.RWMutex
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AllDevices api.LUNMap /* use UUID as the key for all LUs*/
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TargetsLUNMap map[string]api.LUNMap /* use target name as the key for target's LUN map*/
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}
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var globalSCSILUMap = SCSILUMap{AllDevices: make(api.LUNMap), TargetsLUNMap: make(map[string]api.LUNMap)}
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func mappingLUN(deviceID uint64, lun uint64, target string) {
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device := globalSCSILUMap.AllDevices[deviceID]
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lunMap := globalSCSILUMap.TargetsLUNMap[target]
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if lunMap == nil {
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globalSCSILUMap.TargetsLUNMap[target] = make(api.LUNMap)
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lunMap = globalSCSILUMap.TargetsLUNMap[target]
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}
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lunMap[lun] = device
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}
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func GetLU(tgtName string, LUN uint64) *api.SCSILu {
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globalSCSILUMap.mutex.RLock()
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defer globalSCSILUMap.mutex.RUnlock()
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lunMap := globalSCSILUMap.TargetsLUNMap[tgtName]
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lun := lunMap[LUN]
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return lun
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}
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func GetTargetLUNMap(tgtName string) api.LUNMap {
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globalSCSILUMap.mutex.RLock()
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defer globalSCSILUMap.mutex.RUnlock()
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lunMap := globalSCSILUMap.TargetsLUNMap[tgtName]
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return lunMap
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}
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func InitSCSILUMap(config *config.Config) error {
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globalSCSILUMap.mutex.Lock()
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defer globalSCSILUMap.mutex.Unlock()
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for _, bs := range config.Storages {
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lu, err := NewSCSILu(bs.DeviceID, bs.Path, bs.Online)
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if err != nil {
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return errors.New("Init SCSI LU map error.")
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}
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globalSCSILUMap.AllDevices[bs.DeviceID] = lu
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}
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for tgtName, tgt := range config.ISCSITargets {
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for lunstr, deviceID := range tgt.LUNs {
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lun, err := strconv.ParseUint(lunstr, 10, 64)
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if err != nil {
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return errors.New("LU Number must be a number")
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}
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mappingLUN(deviceID, lun, tgtName)
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}
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}
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return nil
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}
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