restruct the backend storage command submit
This commit is contained in:
Lei Xue
@@ -17,9 +17,13 @@ limitations under the License.
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package scsi
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import (
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"bytes"
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"fmt"
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"io"
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"github.com/golang/glog"
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"github.com/gostor/gotgt/pkg/api"
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"github.com/gostor/gotgt/pkg/util"
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)
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type BaseBackingStore struct {
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@@ -42,31 +46,149 @@ func NewBackingStore(name string) (api.BackingStore, error) {
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}
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f, ok := registeredBSPlugins[name]
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if !ok {
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return nil, fmt.Errorf("BackingStore %s is not found.", name)
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return nil, fmt.Errorf("Backend storage %s is not found.", name)
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}
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return f()
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}
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type fakeBackingStore struct {
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BaseBackingStore
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}
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func bsPerformCommand(bs api.BackingStore, cmd *api.SCSICommand) (err error) {
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var (
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scb = cmd.SCB.Bytes()
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offset = cmd.Offset
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opcode = api.SCSICommandType(scb[0])
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lu = cmd.Device
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key = ILLEGAL_REQUEST
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asc = ASC_INVALID_FIELD_IN_CDB
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wbuf []byte = []byte{}
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tl int64 = int64(cmd.TL)
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rbuf = make([]byte, tl)
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length int
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doVerify bool = false
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doWrite bool = false
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)
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switch opcode {
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case api.ORWRITE_16:
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tmpbuf := []byte{}
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tmpbuf, err = bs.Read(int64(offset), tl)
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if err != nil {
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key = MEDIUM_ERROR
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asc = ASC_READ_ERROR
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break
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}
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cmd.InSDBBuffer.Buffer = bytes.NewBuffer(tmpbuf)
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func (fake *fakeBackingStore) Open(dev *api.SCSILu, path string) error {
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return nil
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}
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wbuf = cmd.OutSDBBuffer.Buffer.Bytes()
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doWrite = true
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goto write
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case api.COMPARE_AND_WRITE:
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// TODO
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doWrite = true
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goto write
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case api.SYNCHRONIZE_CACHE, api.SYNCHRONIZE_CACHE_16:
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if err = bs.DataSync(); err != nil {
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panic(err)
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}
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break
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case api.WRITE_VERIFY, api.WRITE_VERIFY_12, api.WRITE_VERIFY_16:
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doVerify = true
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case api.WRITE_6, api.WRITE_10, api.WRITE_12, api.WRITE_16:
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wbuf = cmd.OutSDBBuffer.Buffer.Bytes()
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doWrite = true
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goto write
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case api.WRITE_SAME, api.WRITE_SAME_16:
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// TODO
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break
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case api.READ_6, api.READ_10, api.READ_12, api.READ_16:
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rbuf, err = bs.Read(int64(offset), tl)
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if err != nil && err != io.EOF {
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key = MEDIUM_ERROR
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asc = ASC_READ_ERROR
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break
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}
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length = len(rbuf)
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for i := 0; i < int(tl)-length; i++ {
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rbuf = append(rbuf, 0)
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}
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func (fake *fakeBackingStore) Close(dev *api.SCSILu) error {
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return nil
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}
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if (opcode != api.READ_6) && (scb[1]&0x10 != 0) {
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bs.DataAdvise(int64(offset), int64(length), util.POSIX_FADV_NOREUSE)
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}
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cmd.InSDBBuffer.Buffer = bytes.NewBuffer(rbuf)
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case api.PRE_FETCH_10, api.PRE_FETCH_16:
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err = bs.DataAdvise(int64(offset), tl, util.POSIX_FADV_WILLNEED)
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if err != nil {
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key = MEDIUM_ERROR
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asc = ASC_READ_ERROR
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}
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case api.VERIFY_10, api.VERIFY_12, api.VERIFY_16:
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doVerify = true
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goto verify
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case api.UNMAP:
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// TODO
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default:
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break
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}
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write:
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if doWrite {
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// hack: wbuf = []byte("hello world!")
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err = bs.Write(wbuf, int64(offset))
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if err != nil {
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glog.Error(err)
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key = MEDIUM_ERROR
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asc = ASC_READ_ERROR
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goto sense
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}
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glog.V(2).Infof("write data at %d for length %d", offset, len(wbuf))
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var pg *api.ModePage
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for _, p := range lu.ModePages {
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if p.PageCode == 0x08 && p.SubPageCode == 0 {
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pg = &p
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break
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}
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}
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if pg == nil {
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key = ILLEGAL_REQUEST
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asc = ASC_INVALID_FIELD_IN_CDB
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goto sense
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}
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if ((opcode != api.WRITE_6) && (scb[1]&0x8 != 0)) || (pg.Data[0]&0x04 == 0) {
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if err = bs.DataSync(); err != nil {
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key = MEDIUM_ERROR
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asc = ASC_READ_ERROR
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goto sense
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}
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}
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func (fake *fakeBackingStore) Init(dev *api.SCSILu, Opts string) error {
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if (opcode != api.WRITE_6) && (scb[1]&0x10 != 0) {
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bs.DataAdvise(int64(offset), int64(length), util.POSIX_FADV_NOREUSE)
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}
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}
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verify:
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if doVerify {
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rbuf, err = bs.Read(int64(offset), tl)
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if err != nil {
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key = MEDIUM_ERROR
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asc = ASC_READ_ERROR
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goto sense
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}
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if !bytes.Equal(cmd.OutSDBBuffer.Buffer.Bytes(), rbuf) {
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err = fmt.Errorf("verify fail between out buffer and read buffer")
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key = MISCOMPARE
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asc = ASC_MISCOMPARE_DURING_VERIFY_OPERATION
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goto sense
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}
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if scb[1]&0x10 != 0 {
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bs.DataAdvise(int64(offset), int64(length), util.POSIX_FADV_WILLNEED)
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}
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}
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glog.Infof("io done %s", string(scb))
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return nil
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}
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sense:
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if err != nil {
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glog.Error(err)
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return err
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}
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func (fake *fakeBackingStore) Exit(dev *api.SCSILu) error {
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return nil
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}
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func (fake *fakeBackingStore) CommandSubmit(cmd *api.SCSICommand) error {
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return nil
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err = fmt.Errorf("sense data encounter, key: %v, asc: %v", key, asc)
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return err
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}
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