init commit

2015-12-14 10:23:35 +08:00
parent 8a42eb1bab
commit a9a7d63c20
42 changed files with 4261 additions and 1 deletions
--- a/pkg/scsi/backingstore.go
+++ b/pkg/scsi/backingstore.go
@@ -0,0 +1,76 @@
+/*
+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 "fmt"
+
+type BaseBackingStore struct {
+	Name            string
+	DataSize        int
+	OflagsSupported int
+}
+
+type BackingStore interface {
+	Open(dev *SCSILu, path string, fd *int, size *uint64) error
+	Close(dev *SCSILu) error
+	Init(dev *SCSILu, Opts string) error
+	Exit(dev *SCSILu) error
+	CommandSubmit(cmd *SCSICommand) error
+}
+
+type BackingStoreFunc func() (BackingStore, error)
+
+var registeredPlugins = map[name](BackingStoreFunc){}
+
+func RegisterBackingStore(name string, f BackingStoreFunc) {
+	registeredPlugins[name] = f
+}
+
+func NewBackingStore(name string) (BackingStore, error) {
+	if name == "" {
+		return nil, nil
+	}
+	f, ok := registeredPlugins[name]
+	if !ok {
+		return nil, fmt.Errorf("BackingStore %s is not found.", name)
+	}
+	return f()
+}
+
+type fakeBackingStore struct {
+	BaseBackingStore
+}
+
+func (fake *fakeBackingStore) Open(dev *SCSILu, path string, fd *int, size *uint64) error {
+	return nil
+}
+
+func (fake *fakeBackingStore) Close(dev *SCSILu) error {
+	return nil
+}
+
+func (fake *fakeBackingStore) Init(dev *SCSILu, Opts string) error {
+	return nil
+}
+
+func (fake *fakeBackingStore) Exit(dev *SCSILu) error {
+	return nil
+}
+
+func (fake *fakeBackingStore) CommandSubmit(cmd *SCSICommand) error {
+	return nil
+}
--- a/pkg/scsi/backingstore/common.go
+++ b/pkg/scsi/backingstore/common.go
@@ -0,0 +1,55 @@
+/*
+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 backingstore
+
+import "github.com/gostor/gotgt/pkg/scsi"
+
+func init() {
+	scsi.RegisterBackingStore("file", new)
+}
+
+type FileBackingStore struct {
+	BaseBackingStore
+}
+
+func new() (scsi.BackingStore, error) {
+	return NullBackingStore{
+		Name:            "file",
+		DataSize:        0,
+		OflagsSupported: 0,
+	}, nil
+}
+
+func (bs *FileBackingStore) Open(dev *SCSILu, path string, fd *int, size *uint64) error {
+	return nil
+}
+
+func (bs *FileBackingStore) Close(dev *SCSILu) error {
+	return nil
+}
+
+func (bs *FileBackingStore) Init(dev *SCSILu, Opts string) error {
+	return nil
+}
+
+func (bs *FileBackingStore) Exit(dev *SCSILu) error {
+	return nil
+}
+
+func (bs *FileBackingStore) CommandSubmit(cmd *SCSICommand) error {
+	return nil
+}
--- a/pkg/scsi/backingstore/null.go
+++ b/pkg/scsi/backingstore/null.go
@@ -0,0 +1,55 @@
+/*
+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 backingstore
+
+import "github.com/gostor/gotgt/pkg/scsi"
+
+func init() {
+	scsi.RegisterBackingStore("null", new)
+}
+
+type NullBackingStore struct {
+	BaseBackingStore
+}
+
+func new() (scsi.BackingStore, error) {
+	return NullBackingStore{
+		Name:            "null",
+		DataSize:        0,
+		OflagsSupported: 0,
+	}, nil
+}
+
+func (bs *NullBackingStore) Open(dev *SCSILu, path string, fd *int, size *uint64) error {
+	return nil
+}
+
+func (bs *NullBackingStore) Close(dev *SCSILu) error {
+	return nil
+}
+
+func (bs *NullBackingStore) Init(dev *SCSILu, Opts string) error {
+	return nil
+}
+
+func (bs *NullBackingStore) Exit(dev *SCSILu) error {
+	return nil
+}
+
+func (bs *NullBackingStore) CommandSubmit(cmd *SCSICommand) error {
+	return nil
+}
--- a/pkg/scsi/cmd.go
+++ b/pkg/scsi/cmd.go
@@ -0,0 +1,192 @@
+/*
+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
+
+type SCSICommandType byte
+
+var (
+	TEST_UNIT_READY           SCSICommandType = 0x00
+	REZERO_UNIT               SCSICommandType = 0x01
+	REQUEST_SENSE             SCSICommandType = 0x03
+	FORMAT_UNIT               SCSICommandType = 0x04
+	READ_BLOCK_LIMITS         SCSICommandType = 0x05
+	REASSIGN_BLOCKS           SCSICommandType = 0x07
+	INITIALIZE_ELEMENT_STATUS SCSICommandType = 0x07
+	READ_6                    SCSICommandType = 0x08
+	WRITE_6                   SCSICommandType = 0x0a
+	SEEK_6                    SCSICommandType = 0x0b
+	READ_REVERSE              SCSICommandType = 0x0f
+	WRITE_FILEMARKS           SCSICommandType = 0x10
+	SPACE                     SCSICommandType = 0x11
+	INQUIRY                   SCSICommandType = 0x12
+	RECOVER_BUFFERED_DATA     SCSICommandType = 0x14
+	MODE_SELECT               SCSICommandType = 0x15
+	RESERVE                   SCSICommandType = 0x16
+	RELEASE                   SCSICommandType = 0x17
+	COPY                      SCSICommandType = 0x18
+	ERASE                     SCSICommandType = 0x19
+	MODE_SENSE                SCSICommandType = 0x1a
+	START_STOP                SCSICommandType = 0x1b
+	RECEIVE_DIAGNOSTIC        SCSICommandType = 0x1c
+	SEND_DIAGNOSTIC           SCSICommandType = 0x1d
+	ALLOW_MEDIUM_REMOVAL      SCSICommandType = 0x1e
+
+	SET_WINDOW                           SCSICommandType = 0x24
+	READ_CAPACITY                        SCSICommandType = 0x25
+	READ_10                              SCSICommandType = 0x28
+	WRITE_10                             SCSICommandType = 0x2a
+	SEEK_10                              SCSICommandType = 0x2b
+	POSITION_TO_ELEMENT                  SCSICommandType = 0x2b
+	WRITE_VERIFY                         SCSICommandType = 0x2e
+	VERIFY_10                            SCSICommandType = 0x2f
+	SEARCH_HIGH                          SCSICommandType = 0x30
+	SEARCH_EQUAL                         SCSICommandType = 0x31
+	SEARCH_LOW                           SCSICommandType = 0x32
+	SET_LIMITS                           SCSICommandType = 0x33
+	PRE_FETCH_10                         SCSICommandType = 0x34
+	READ_POSITION                        SCSICommandType = 0x34
+	SYNCHRONIZE_CACHE                    SCSICommandType = 0x35
+	LOCK_UNLOCK_CACHE                    SCSICommandType = 0x36
+	READ_DEFECT_DATA                     SCSICommandType = 0x37
+	INITIALIZE_ELEMENT_STATUS_WITH_RANGE SCSICommandType = 0x37
+	MEDIUM_SCAN                          SCSICommandType = 0x38
+	COMPARE                              SCSICommandType = 0x39
+	COPY_VERIFY                          SCSICommandType = 0x3a
+	WRITE_BUFFER                         SCSICommandType = 0x3b
+	READ_BUFFER                          SCSICommandType = 0x3c
+	UPDATE_BLOCK                         SCSICommandType = 0x3d
+	READ_LONG                            SCSICommandType = 0x3e
+	WRITE_LONG                           SCSICommandType = 0x3f
+	CHANGE_DEFINITION                    SCSICommandType = 0x40
+	WRITE_SAME                           SCSICommandType = 0x41
+	UNMAP                                SCSICommandType = 0x42
+	READ_TOC                             SCSICommandType = 0x43
+	GET_CONFIGURATION                    SCSICommandType = 0x46
+	LOG_SELECT                           SCSICommandType = 0x4c
+	LOG_SENSE                            SCSICommandType = 0x4d
+	READ_DISK_INFO                       SCSICommandType = 0x51
+	READ_TRACK_INFO                      SCSICommandType = 0x52
+	MODE_SELECT_10                       SCSICommandType = 0x55
+	RESERVE_10                           SCSICommandType = 0x56
+	RELEASE_10                           SCSICommandType = 0x57
+	MODE_SENSE_10                        SCSICommandType = 0x5a
+	CLOSE_TRACK                          SCSICommandType = 0x5b
+	READ_BUFFER_CAP                      SCSICommandType = 0x5c
+	PERSISTENT_RESERVE_IN                SCSICommandType = 0x5e
+	PERSISTENT_RESERVE_OUT               SCSICommandType = 0x5f
+	VARLEN_CDB                           SCSICommandType = 0x7f
+	READ_16                              SCSICommandType = 0x88
+	COMPARE_AND_WRITE                    SCSICommandType = 0x89
+	WRITE_16                             SCSICommandType = 0x8a
+	ORWRITE_16                           SCSICommandType = 0x8b
+	WRITE_VERIFY_16                      SCSICommandType = 0x8e
+	VERIFY_16                            SCSICommandType = 0x8f
+	PRE_FETCH_16                         SCSICommandType = 0x90
+	SYNCHRONIZE_CACHE_16                 SCSICommandType = 0x91
+	WRITE_SAME_16                        SCSICommandType = 0x93
+	SERVICE_ACTION_IN                    SCSICommandType = 0x9e
+	SAI_READ_CAPACITY_16                 SCSICommandType = 0x10
+	SAI_GET_LBA_STATUS                   SCSICommandType = 0x12
+	REPORT_LUNS                          SCSICommandType = 0xa0
+	MAINT_PROTOCOL_IN                    SCSICommandType = 0xa3
+	MOVE_MEDIUM                          SCSICommandType = 0xa5
+	EXCHANGE_MEDIUM                      SCSICommandType = 0xa6
+	READ_12                              SCSICommandType = 0xa8
+	WRITE_12                             SCSICommandType = 0xaa
+	GET_PERFORMACE                       SCSICommandType = 0xac
+	READ_DVD_STRUCTURE                   SCSICommandType = 0xad
+	WRITE_VERIFY_12                      SCSICommandType = 0xae
+	VERIFY_12                            SCSICommandType = 0xaf
+	SEARCH_HIGH_12                       SCSICommandType = 0xb0
+	SEARCH_EQUAL_12                      SCSICommandType = 0xb1
+	SEARCH_LOW_12                        SCSICommandType = 0xb2
+	READ_ELEMENT_STATUS                  SCSICommandType = 0xb8
+	SEND_VOLUME_TAG                      SCSICommandType = 0xb6
+	SET_STREAMING                        SCSICommandType = 0xb6
+	SET_CD_SPEED                         SCSICommandType = 0xbb
+	WRITE_LONG_2                         SCSICommandType = 0xea
+)
+
+type SCSIPRServiceAction byte
+type SCSIPRType byte
+
+var (
+	/* PERSISTENT_RESERVE_IN service action codes */
+	PR_IN_READ_KEYS           SCSIPRServiceAction = 0x00
+	PR_IN_READ_RESERVATION    SCSIPRServiceAction = 0x01
+	PR_IN_REPORT_CAPABILITIES SCSIPRServiceAction = 0x02
+	PR_IN_READ_FULL_STATUS    SCSIPRServiceAction = 0x03
+
+	/* PERSISTENT_RESERVE_OUT service action codes */
+	PR_OUT_REGISTER                         SCSIPRServiceAction = 0x00
+	PR_OUT_RESERVE                          SCSIPRServiceAction = 0x01
+	PR_OUT_RELEASE                          SCSIPRServiceAction = 0x02
+	PR_OUT_CLEAR                            SCSIPRServiceAction = 0x03
+	PR_OUT_PREEMPT                          SCSIPRServiceAction = 0x04
+	PR_OUT_PREEMPT_AND_ABORT                SCSIPRServiceAction = 0x05
+	PR_OUT_REGISTER_AND_IGNORE_EXISTING_KEY SCSIPRServiceAction = 0x06
+	PR_OUT_REGISTER_AND_MOVE                SCSIPRServiceAction = 0x07
+
+	/* Persistent Reservation scope */
+	PR_LU_SCOPE byte = 0x00
+
+	/* Persistent Reservation Type Mask format */
+	PR_TYPE_WRITE_EXCLUSIVE          SCSIPRType = 0x01
+	PR_TYPE_EXCLUSIVE_ACCESS         SCSIPRType = 0x03
+	PR_TYPE_WRITE_EXCLUSIVE_REGONLY  SCSIPRType = 0x05
+	PR_TYPE_EXCLUSIVE_ACCESS_REGONLY SCSIPRType = 0x06
+	PR_TYPE_WRITE_EXCLUSIVE_ALLREG   SCSIPRType = 0x07
+	PR_TYPE_EXCLUSIVE_ACCESS_ALLREG  SCSIPRType = 0x08
+)
+
+type SCSIDataDirection int
+
+const (
+	SCSIDataNone = iota
+	SCSIDataWrite
+	SCSIDataRead
+	SCSIDataBidirection
+)
+
+type SCSIDataBuffer struct {
+	Buffer         uint64
+	Length         uint64
+	TransferLength uint32
+	Resid          int32
+}
+
+type SCSICommand struct {
+	Target       *SCSITarget
+	DeviceID     uint64
+	Device       *SCSILu
+	State        uint64
+	Direction    SCSIDataDirection
+	InSDBBuffer  *SCSIDataBuffer
+	OutSDBBuffer *SCSIDataBuffer
+	// Command ITN ID
+	CommandITNID uint64
+	Offset       uint64
+	TL           uint32
+	SCB          *[]byte
+	SCBLength    int
+	Lun          []uint8
+	Attribute    int
+	Tag          uint64
+	Result       int
+	SenseBuffer  []byte
+	SenseLength  int
+}
--- a/pkg/scsi/drivers.go
+++ b/pkg/scsi/drivers.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.
+*/
+
+// Target Driver Interface
+package scsi
+
+var SCSITargetDriverState int
+
+const (
+	// just registered
+	SCSI_DRIVER_REGD = iota
+	// initialized ok
+	SCSI_DRIVER_INIT
+	// failed to initialize
+	SCSI_DRIVER_ERR
+	// exited
+	SCSI_DRIVER_EXIT
+)
+
+type SCSITargetDriver struct {
+	Name       string
+	State      SCSITargetDriverState
+	DefaultBST string
+	Targets    []*SCSITarget
+}
+
+type SCSITargetDriverOps interface {
+	Init() error
+	Exit() error
+
+	CreateTarget(target *SCSITarget) error
+	DestroyTarget(target *SCSITarget) error
+	CreatePortal(name string) error
+	DestroyPortal(name string) error
+	CreateLu(lu *SCSILu) error
+
+	GetLun(lun uint8) (uint64, error)
+	CommandNotify(nid uint64, result int, cmd *SCSICommand) error
+}
+
+var fakeSCSITargetDriver SCSITargetDriver
+
+func (fake *fakeSCSITargetDriver) Init() error {
+	return nil
+}
+
+func (fake *fakeSCSITargetDriver) Exit() error {
+	return nil
+}
+
+func (fake *fakeSCSITargetDriver) CreateTarget(target *SCSITarget) error {
+	return nil
+}
+
+func (fake *fakeSCSITargetDriver) DestroyTarget(target *SCSITarget) error {
+	return nil
+}
+
+func (fake *fakeSCSITargetDriver) CreatePortal(name string) error {
+	return nil
+}
+
+func (fake *fakeSCSITargetDriver) DestroyPortal(name string) error {
+	return nil
+}
+
+func (fake *fakeSCSITargetDriver) CreateLu(lu *SCSILu) error {
+	return nil
+}
+
+func (fake *fakeSCSITargetDriver) GetLun(lun uint8) (uint64, error) {
+	return 0, nil
+}
+func (fake *fakeSCSITargetDriver) CommandNotify(nid uint64, result int, cmd *SCSICommand) error {
+	return nil
+}
--- a/pkg/scsi/error.go
+++ b/pkg/scsi/error.go
@@ -0,0 +1,123 @@
+/*
+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
+
+type SCSIError byte
+
+var (
+	NO_SENSE        SCSIError = 0x00
+	RECOVERED_ERROR SCSIError = 0x01
+	NOT_READY       SCSIError = 0x02
+	MEDIUM_ERROR    SCSIError = 0x03
+	HARDWARE_ERROR  SCSIError = 0x04
+	ILLEGAL_REQUEST SCSIError = 0x05
+	UNIT_ATTENTION  SCSIError = 0x06
+	DATA_PROTECT    SCSIError = 0x07
+	BLANK_CHECK     SCSIError = 0x08
+	COPY_ABORTED    SCSIError = 0x0a
+	ABORTED_COMMAND SCSIError = 0x0b
+	VOLUME_OVERFLOW SCSIError = 0x0d
+	MISCOMPARE      SCSIError = 0x0e
+)
+
+type SCSISubError uint16
+
+var (
+	/* Key 0: No Sense Errors */
+	NO_ADDITIONAL_SENSE         SCSISubError = 0x0000
+	ASC_MARK                    SCSISubError = 0x0001
+	ASC_EOM                     SCSISubError = 0x0002
+	ASC_BOM                     SCSISubError = 0x0004
+	ASC_END_OF_DATA             SCSISubError = 0x0005
+	ASC_OP_IN_PROGRESS          SCSISubError = 0x0016
+	ASC_DRIVE_REQUIRES_CLEANING SCSISubError = 0x8282
+
+	/* Key 1: Recovered Errors */
+	ASC_WRITE_ERROR            SCSISubError = 0x0c00
+	ASC_READ_ERROR             SCSISubError = 0x1100
+	ASC_RECOVERED_WITH_RETRYS  SCSISubError = 0x1701
+	ASC_MEDIA_LOAD_EJECT_ERROR SCSISubError = 0x5300
+	ASC_FAILURE_PREDICTION     SCSISubError = 0x5d00
+
+	/* Key 2: Not ready */
+	ASC_CAUSE_NOT_REPORTABLE    SCSISubError = 0x0400
+	ASC_BECOMING_READY          SCSISubError = 0x0401
+	ASC_INITIALIZING_REQUIRED   SCSISubError = 0x0402
+	ASC_CLEANING_CART_INSTALLED SCSISubError = 0x3003
+	ASC_CLEANING_FAILURE        SCSISubError = 0x3007
+	ASC_MEDIUM_NOT_PRESENT      SCSISubError = 0x3a00
+	ASC_LOGICAL_UNIT_NOT_CONFIG SCSISubError = 0x3e00
+
+	/* Key 3: Medium Errors */
+	ASC_WRITE_ERROR                SCSISubError = 0x0c00
+	ASC_UNRECOVERED_READ           SCSISubError = 0x1100
+	ASC_RECORDED_ENTITY_NOT_FOUND  SCSISubError = 0x1400
+	ASC_UNKNOWN_FORMAT             SCSISubError = 0x3001
+	ASC_IMCOMPATIBLE_FORMAT        SCSISubError = 0x3002
+	ASC_MEDIUM_FORMAT_CORRUPT      SCSISubError = 0x3100
+	ASC_SEQUENTIAL_POSITION_ERR    SCSISubError = 0x3b00
+	ASC_WRITE_APPEND_ERR           SCSISubError = 0x5000
+	ASC_CARTRIDGE_FAULT            SCSISubError = 0x5200
+	ASC_MEDIA_LOAD_OR_EJECT_FAILED SCSISubError = 0x5300
+
+	/* Key 4: Hardware Failure */
+	ASC_COMPRESSION_CHECK            SCSISubError = 0x0c04
+	ASC_DECOMPRESSION_CRC            SCSISubError = 0x110d
+	ASC_MECHANICAL_POSITIONING_ERROR SCSISubError = 0x1501
+	ASC_MANUAL_INTERVENTION_REQ      SCSISubError = 0x0403
+	ASC_HARDWARE_FAILURE             SCSISubError = 0x4000
+	ASC_INTERNAL_TGT_FAILURE         SCSISubError = 0x4400
+	ASC_ERASE_FAILURE                SCSISubError = 0x5100
+
+	/* Key 5: Illegal Request */
+	ASC_PARAMETER_LIST_LENGTH_ERR                 SCSISubError = 0x1a00
+	ASC_INVALID_OP_CODE                           SCSISubError = 0x2000
+	ASC_LBA_OUT_OF_RANGE                          SCSISubError = 0x2100
+	ASC_INVALID_FIELD_IN_CDB                      SCSISubError = 0x2400
+	ASC_LUN_NOT_SUPPORTED                         SCSISubError = 0x2500
+	ASC_INVALID_FIELD_IN_PARMS                    SCSISubError = 0x2600
+	ASC_INVALID_RELEASE_OF_PERSISTENT_RESERVATION SCSISubError = 0x2604
+	ASC_INCOMPATIBLE_FORMAT                       SCSISubError = 0x3005
+	ASC_SAVING_PARMS_UNSUP                        SCSISubError = 0x3900
+	ASC_MEDIUM_DEST_FULL                          SCSISubError = 0x3b0d
+	ASC_MEDIUM_SRC_EMPTY                          SCSISubError = 0x3b0e
+	ASC_POSITION_PAST_BOM                         SCSISubError = 0x3b0c
+	ASC_MEDIUM_REMOVAL_PREVENTED                  SCSISubError = 0x5302
+	ASC_INSUFFICENT_REGISTRATION_RESOURCES        SCSISubError = 0x5504
+	ASC_BAD_MICROCODE_DETECTED                    SCSISubError = 0x8283
+
+	/* Key 6: Unit Attention */
+	ASC_NOT_READY_TO_TRANSITION         SCSISubError = 0x2800
+	ASC_POWERON_RESET                   SCSISubError = 0x2900
+	ASC_I_T_NEXUS_LOSS_OCCURRED         SCSISubError = 0x2907
+	ASC_MODE_PARAMETERS_CHANGED         SCSISubError = 0x2a01
+	ASC_RESERVATIONS_PREEMPTED          SCSISubError = 0x2a03
+	ASC_RESERVATIONS_RELEASED           SCSISubError = 0x2a04
+	ASC_INSUFFICIENT_TIME_FOR_OPERATION SCSISubError = 0x2e00
+	ASC_CMDS_CLEARED_BY_ANOTHER_INI     SCSISubError = 0x2f00
+	ASC_MICROCODE_DOWNLOADED            SCSISubError = 0x3f01
+	ASC_INQUIRY_DATA_HAS_CHANGED        SCSISubError = 0x3f03
+	ASC_REPORTED_LUNS_DATA_HAS_CHANGED  SCSISubError = 0x3f0e
+	ASC_FAILURE_PREDICTION_FALSE        SCSISubError = 0x5dff
+
+	/* Data Protect */
+	ASC_WRITE_PROTECT              SCSISubError = 0x2700
+	ASC_MEDIUM_OVERWRITE_ATTEMPTED SCSISubError = 0x300c
+
+	/* Miscompare */
+	ASC_MISCOMPARE_DURING_VERIFY_OPERATION SCSISubError = 0x1d00
+)
--- a/pkg/scsi/lun.go
+++ b/pkg/scsi/lun.go
@@ -0,0 +1,29 @@
+/*
+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
+
+type SCSILu struct {
+	FD         int
+	Address    uint64
+	Size       uint64
+	Lun        uint64
+	Path       string
+	BsoFlags   int
+	BlockShift uint
+	ReserveID  uint64
+	Target     *SCSITarget
+}
--- a/pkg/scsi/sbc.go
+++ b/pkg/scsi/sbc.go
@@ -0,0 +1,18 @@
+/*
+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.
+*/
+
+// SCSI block command processing
+package scsi
--- a/pkg/scsi/scsi.go
+++ b/pkg/scsi/scsi.go
@@ -0,0 +1,60 @@
+/*
+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
+
+var (
+	DefaultBlockShift      int = 9
+	DefaultSenseBufferSize int = 252
+)
+
+type SAMStat byte
+type SCSIDeviceType byte
+
+var (
+	SAM_STAT_GOOD                       SAMStat = 0x00
+	SAM_STAT_CHECK_CONDITION            SAMStat = 0x02
+	SAM_STAT_CONDITION_MET              SAMStat = 0x04
+	SAM_STAT_BUSY                       SAMStat = 0x08
+	SAM_STAT_INTERMEDIATE               SAMStat = 0x10
+	SAM_STAT_INTERMEDIATE_CONDITION_MET SAMStat = 0x14
+	SAM_STAT_RESERVATION_CONFLICT       SAMStat = 0x18
+	SAM_STAT_COMMAND_TERMINATED         SAMStat = 0x22
+	SAM_STAT_TASK_SET_FULL              SAMStat = 0x28
+	SAM_STAT_ACA_ACTIVE                 SAMStat = 0x30
+	SAM_STAT_TASK_ABORTED               SAMStat = 0x40
+)
+
+var (
+	TYPE_DISK      SCSIDeviceType = 0x00
+	TYPE_TAPE      SCSIDeviceType = 0x01
+	TYPE_PRINTER   SCSIDeviceType = 0x02
+	TYPE_PROCESSOR SCSIDeviceType = 0x03
+	TYPE_WORM      SCSIDeviceType = 0x04
+	TYPE_MMC       SCSIDeviceType = 0x05
+	TYPE_SCANNER   SCSIDeviceType = 0x06
+	TYPE_MOD       SCSIDeviceType = 0x07
+
+	TYPE_MEDIUM_CHANGER SCSIDeviceType = 0x08
+	TYPE_COMM           SCSIDeviceType = 0x09
+	TYPE_RAID           SCSIDeviceType = 0x0c
+	TYPE_ENCLOSURE      SCSIDeviceType = 0x0d
+	TYPE_RBC            SCSIDeviceType = 0x0e
+	TYPE_OSD            SCSIDeviceType = 0x11
+	TYPE_NO_LUN         SCSIDeviceType = 0x7f
+
+	TYPE_PT SCSIDeviceType = 0xff
+)
--- a/pkg/scsi/spc.go
+++ b/pkg/scsi/spc.go
@@ -0,0 +1,103 @@
+/*
+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.
+*/
+
+// SCSI primary command processing
+package scsi
+
+/*
+ * Protocol Identifier Values
+ *
+ * 0 Fibre Channel (FCP-2)
+ * 1 Parallel SCSI (SPI-5)
+ * 2 SSA (SSA-S3P)
+ * 3 IEEE 1394 (SBP-3)
+ * 4 SCSI Remote Direct Memory Access (SRP)
+ * 5 iSCSI
+ * 6 SAS Serial SCSI Protocol (SAS)
+ * 7 Automation/Drive Interface (ADT)
+ * 8 AT Attachment Interface (ATA/ATAPI-7)
+ */
+type ProtocolIdentifier int
+
+var (
+	PIV_FCP   ProtocolIdentifier = iota
+	PIV_SPI   ProtocolIdentifier
+	PIV_S3P   ProtocolIdentifier
+	PIV_SBP   ProtocolIdentifier
+	PIV_SRP   ProtocolIdentifier
+	PIV_ISCSI ProtocolIdentifier
+	PIV_SAS   ProtocolIdentifier
+	PIV_ADT   ProtocolIdentifier
+	PIV_ATA   ProtocolIdentifier
+)
+
+/*
+ * Code Set
+ *
+ *  1 - Designator fild contains binary values
+ *  2 - Designator field contains ASCII printable chars
+ *  3 - Designaotor field contains UTF-8
+ */
+type CodeSet int
+
+var (
+	INQ_CODE_BIN   CodeSet = 1
+	INQ_CODE_ASCII CodeSet = 2
+	INQ_CODE_UTF8  CodeSet = 3
+)
+
+/*
+ * Association field
+ *
+ * 00b - Associated with Logical Unit
+ * 01b - Associated with target port
+ * 10b - Associated with SCSI Target device
+ * 11b - Reserved
+ */
+type AssociationField int
+
+var (
+	ASS_LU       AssociationField = 0
+	ASS_TGT_PORT AssociationField = 0x10
+	ASS_TGT_DEV  AssociationField = 0x20
+)
+
+/*
+ * Designator type - SPC-4 Reference
+ *
+ * 0 - Vendor specific - 7.6.3.3
+ * 1 - T10 vendor ID - 7.6.3.4
+ * 2 - EUI-64 - 7.6.3.5
+ * 3 - NAA - 7.6.3.6
+ * 4 - Relative Target port identifier - 7.6.3.7
+ * 5 - Target Port group - 7.6.3.8
+ * 6 - Logical Unit group - 7.6.3.9
+ * 7 - MD5 logical unit identifier - 7.6.3.10
+ * 8 - SCSI name string - 7.6.3.11
+ */
+type DesignatorType int
+
+var (
+	DESG_VENDOR       DesignatorType = iota
+	DESG_T10          DesignatorType
+	DESG_EUI64        DesignatorType
+	DESG_NAA          DesignatorType
+	DESG_REL_TGT_PORT DesignatorType
+	DESG_TGT_PORT_GRP DesignatorType
+	DESG_LU_GRP       DesignatorType
+	DESG_MD5          DesignatorType
+	DESG_SCSI         DesignatorType
+)
--- a/pkg/scsi/target.go
+++ b/pkg/scsi/target.go
@@ -0,0 +1,31 @@
+/*
+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
+
+var SCSITargetState int
+
+var (
+	TargetOnline SCSITargetState = 1
+	TargetReady  SCSITargetState = 2
+)
+
+type SCSITarget struct {
+	Name  string
+	TID   int
+	LID   int
+	State SCSITargetState
+}