d7891b1f68
- Convert constant to var so that it can be configured from backend - Add options to disable persistent reservation and ORWrite16 commands Signed-off-by: Utkarsh Mani Tripathi <utkarsh.tripathi@mayadata.io>
119 lines
2.7 KiB
Go
119 lines
2.7 KiB
Go
/*
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Copyright 2016 openebs 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 remote
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import (
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"fmt"
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"github.com/gostor/gotgt/pkg/api"
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"github.com/gostor/gotgt/pkg/scsi"
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log "github.com/sirupsen/logrus"
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)
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var (
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Size uint64
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)
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func init() {
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scsi.RegisterBackingStore("RemBs", NewRemoteBackingStore)
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}
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// RemBackingStore
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type RemBackingStore struct {
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scsi.BaseBackingStore
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// Remote backing store, remote server exposing
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// read and write methods.
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RemBs api.RemoteBackingStore
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}
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func NewRemoteBackingStore() (api.BackingStore, error) {
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return &RemBackingStore{
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BaseBackingStore: scsi.BaseBackingStore{
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Name: "RemBs",
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OflagsSupported: 0,
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},
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}, nil
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}
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func (bs *RemBackingStore) Open(dev *api.SCSILu, path string) error {
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if Size == 0 {
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return fmt.Errorf("Size is not initialized")
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}
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var err error
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bs.DataSize = Size
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bs.RemBs, err = scsi.GetTargetBSMap(path)
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if err != nil {
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return err
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}
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return nil
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}
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func (bs *RemBackingStore) Close(dev *api.SCSILu) error {
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/* TODO return bs.File.Close()*/
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return nil
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}
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func (bs *RemBackingStore) Init(dev *api.SCSILu, Opts string) error {
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return nil
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}
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func (bs *RemBackingStore) Exit(dev *api.SCSILu) error {
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return nil
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}
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func (bs *RemBackingStore) Size(dev *api.SCSILu) uint64 {
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return bs.DataSize
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}
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func (bs *RemBackingStore) Read(offset, tl int64) ([]byte, error) {
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tmpbuf := make([]byte, tl)
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length, err := bs.RemBs.ReadAt(tmpbuf, offset)
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if err != nil {
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return nil, err
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}
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if length != len(tmpbuf) {
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return nil, fmt.Errorf("Incomplete read expected:%d actual:%d", tl, length)
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}
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return tmpbuf, nil
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}
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func (bs *RemBackingStore) Write(wbuf []byte, offset int64) error {
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length, err := bs.RemBs.WriteAt(wbuf, offset)
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if err != nil {
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log.Error(err)
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return err
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}
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if length != len(wbuf) {
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return fmt.Errorf("Incomplete write expected:%d actual:%d", len(wbuf), length)
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}
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return nil
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}
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func (bs *RemBackingStore) DataAdvise(offset, length int64, advise uint32) error {
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return nil
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}
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func (bs *RemBackingStore) DataSync(offset, length int64) (err error) {
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_, err = bs.RemBs.Sync()
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return
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}
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func (bs *RemBackingStore) Unmap(bd []api.UnmapBlockDescriptor) (err error) {
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_, err = bs.RemBs.Unmap(int64(bd[0].Offset), int64(bd[0].TL))
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return
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}
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