/
scsi_pr.go
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/
scsi_pr.go
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/*
Copyright 2016 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 (
"github.com/gostor/gotgt/pkg/api"
"github.com/satori/go.uuid"
)
type SCSIReservationOperator interface {
GetCurrentReservation(tgtName string, devUUID uint64) *api.SCSIReservation
SetCurrentReservation(tgtName string, devUUID uint64, res *api.SCSIReservation) bool
IsCurrentReservation(tgtName string, devUUID uint64, res *api.SCSIReservation) bool
GetPRGeneration(tgtName string, devUUID uint64) (uint32, bool)
IncPRGeneration(tgtName string, devUUID uint64) bool
AddReservation(tgtName string, devUUID uint64, res *api.SCSIReservation) bool
GetReservation(tgtName string, devUUID uint64, ITNexusID uuid.UUID) *api.SCSIReservation
GetReservationList(tgtName string, devUUID uint64) []*api.SCSIReservation
DeleteAndRemoveReservation(tgtName string, devUUID uint64, res *api.SCSIReservation)
RemoveReservation(tgtName string, devUUID uint64, res *api.SCSIReservation)
RemoveAllReservation(tgtName string, devUUID uint64)
IsKeyExists(tgtName string, devUUID uint64, key uint64) bool
Save(tgtName string, devUUID uint64) bool
}
var onePROperator SCSIReservationOperator
func GetSCSIReservationOperator() SCSIReservationOperator {
if onePROperator == nil {
onePROperator = &SCSISimpleReservationOperator{
targetReservations: make(map[string]SCSILUReservationMap),
}
}
return onePROperator
}
type SCSILUReservation struct {
TargetName string
DeviceUUID uint64
PRGeneration uint32
Reservations []*api.SCSIReservation
CurrentReservation *api.SCSIReservation
}
type SCSILUReservationMap map[uint64]*SCSILUReservation /* device uuid as the key */
type SCSISimpleReservationOperator struct {
SCSIReservationOperator
targetReservations map[string]SCSILUReservationMap /* target name as the key*/
}
func (op *SCSISimpleReservationOperator) InitLUReservation(tgtName string, devUUID uint64) {
var (
targetRes SCSILUReservationMap
ok bool
)
if targetRes, ok = op.targetReservations[tgtName]; !ok {
op.targetReservations[tgtName] = make(SCSILUReservationMap)
targetRes = op.targetReservations[tgtName]
}
if _, ok = targetRes[devUUID]; !ok {
targetRes[devUUID] = &SCSILUReservation{TargetName: tgtName,
DeviceUUID: devUUID,
PRGeneration: 0,
Reservations: []*api.SCSIReservation{},
CurrentReservation: nil,
}
}
}
func (op *SCSISimpleReservationOperator) GetReservation(tgtName string, devUUID uint64, ITNexusID uuid.UUID) *api.SCSIReservation {
var (
LURes *SCSILUReservation
SCSIRes *api.SCSIReservation
targetRes SCSILUReservationMap
ok bool
)
if targetRes, ok = op.targetReservations[tgtName]; !ok {
return nil
}
if LURes, ok = targetRes[devUUID]; !ok {
return nil
}
for _, SCSIRes = range LURes.Reservations {
if uuid.Equal(SCSIRes.ITNexusID, ITNexusID) {
return SCSIRes
}
}
return nil
}
func (op *SCSISimpleReservationOperator) GetPRGeneration(tgtName string, devUUID uint64) (uint32, bool) {
var (
LURes *SCSILUReservation
targetRes SCSILUReservationMap
ok bool
)
if targetRes, ok = op.targetReservations[tgtName]; !ok {
return 0, false
}
if LURes, ok = targetRes[devUUID]; !ok {
return 0, false
}
return LURes.PRGeneration, true
}
func (op *SCSISimpleReservationOperator) IncPRGeneration(tgtName string, devUUID uint64) bool {
var (
LURes *SCSILUReservation
targetRes SCSILUReservationMap
ok bool
)
if targetRes, ok = op.targetReservations[tgtName]; !ok {
return false
}
if LURes, ok = targetRes[devUUID]; !ok {
return false
}
LURes.PRGeneration++
return true
}
func (op *SCSISimpleReservationOperator) GetCurrentReservation(tgtName string, devUUID uint64) *api.SCSIReservation {
var (
LURes *SCSILUReservation
targetRes SCSILUReservationMap
ok bool
)
if targetRes, ok = op.targetReservations[tgtName]; !ok {
return nil
}
if LURes, ok = targetRes[devUUID]; !ok {
return nil
}
return LURes.CurrentReservation
}
func (op *SCSISimpleReservationOperator) SetCurrentReservation(tgtName string, devUUID uint64, res *api.SCSIReservation) bool {
var (
LURes *SCSILUReservation
targetRes SCSILUReservationMap
ok bool
)
if targetRes, ok = op.targetReservations[tgtName]; !ok {
return false
}
if LURes, ok = targetRes[devUUID]; !ok {
return false
}
LURes.CurrentReservation = res
return true
}
func (op *SCSISimpleReservationOperator) GetReservationList(tgtName string, devUUID uint64) []*api.SCSIReservation {
var (
LURes *SCSILUReservation
targetRes SCSILUReservationMap
ok bool
)
if targetRes, ok = op.targetReservations[tgtName]; !ok {
return nil
}
if LURes, ok = targetRes[devUUID]; !ok {
return nil
}
return LURes.Reservations
}
func (op *SCSISimpleReservationOperator) DeleteAndRemoveReservation(tgtName string, devUUID uint64, res *api.SCSIReservation) {
var (
i int = -1
ok bool
tmpRes *api.SCSIReservation
LURes *SCSILUReservation
targetRes SCSILUReservationMap
)
if targetRes, ok = op.targetReservations[tgtName]; !ok {
return
}
if LURes, ok = targetRes[devUUID]; !ok {
return
}
resArray := LURes.Reservations
curRes := LURes.CurrentReservation
for i, tmpRes = range resArray {
if tmpRes == res {
break
}
}
if i >= 0 {
resArray[i] = resArray[len(resArray)-1]
resArray[len(resArray)-1] = nil
resArray = resArray[:len(resArray)-1]
LURes.Reservations = resArray
}
if curRes == nil {
return
}
if !op.IsCurrentReservation(tgtName, devUUID, res) {
return
}
if (curRes.Type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG &&
curRes.Type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) ||
len(resArray) == 0 {
curRes.Scope = 0
curRes.Type = 0
LURes.CurrentReservation = nil
for i, tmpRes = range resArray {
if tmpRes == res {
continue
}
//TODO send sense code
}
LURes.PRGeneration++
} else {
for i, tmpRes = range resArray {
if tmpRes != res {
//kep scope and type
LURes.CurrentReservation = tmpRes
tmpRes.Scope = curRes.Scope
tmpRes.Type = curRes.Type
break
}
}
LURes.PRGeneration++
}
}
func (op *SCSISimpleReservationOperator) RemoveReservation(tgtName string, devUUID uint64, res *api.SCSIReservation) {
var (
LURes *SCSILUReservation
targetRes SCSILUReservationMap
tmpRes *api.SCSIReservation
i int = -1
ok bool
)
if targetRes, ok = op.targetReservations[tgtName]; !ok {
return
}
if LURes, ok = targetRes[devUUID]; !ok {
return
}
resArray := LURes.Reservations
for i, tmpRes = range resArray {
if tmpRes == res {
break
}
}
if i >= 0 {
resArray[i] = resArray[len(resArray)-1]
resArray[len(resArray)-1] = nil
resArray = resArray[:len(resArray)-1]
LURes.Reservations = resArray
}
}
func (op *SCSISimpleReservationOperator) AddReservation(tgtName string, devUUID uint64, res *api.SCSIReservation) bool {
var (
LURes *SCSILUReservation
targetRes SCSILUReservationMap
ok bool
)
if targetRes, ok = op.targetReservations[tgtName]; !ok {
return false
}
if LURes, ok = targetRes[devUUID]; !ok {
return false
}
LURes.Reservations = append(LURes.Reservations, res)
return true
}
func (op *SCSISimpleReservationOperator) IsKeyExists(tgtName string, devUUID uint64, key uint64) bool {
resList := op.GetReservationList(tgtName, devUUID)
for _, tmpRes := range resList {
if tmpRes.Key == key {
return true
}
}
return false
}
func (op *SCSISimpleReservationOperator) IsCurrentReservation(tgtName string, devUUID uint64, res *api.SCSIReservation) bool {
curRes := op.GetCurrentReservation(tgtName, devUUID)
if curRes == nil {
return false
}
if curRes.Type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
curRes.Type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG {
return true
}
if curRes == res {
return true
}
return false
}
func (op *SCSISimpleReservationOperator) RemoveAllReservation(tgtName string, devUUID uint64) {
var (
LURes *SCSILUReservation
targetRes SCSILUReservationMap
ok bool
)
if targetRes, ok = op.targetReservations[tgtName]; !ok {
return
}
if LURes, ok = targetRes[devUUID]; !ok {
return
}
LURes.Reservations = []*api.SCSIReservation{}
}
func (op *SCSISimpleReservationOperator) Save(tgtName string, devUUID uint64) bool {
return true
}