SCSI Operation Codes

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USB Mass Storage 是 USB host侧遇到最多的场景，基于 Bulk传输，使用 SCSI协议进行资源交互。当然 UFS也用到 SCSI协议，在使用 UFS的系统，我们插入 U盘经常生成的 dev节点是 /dev/sdb或者是 /dev/sde 。前面的如 /dev/sda、/dev/sdc这些节点可能就被 UFS占用了，识别 log可能就变成 “sd 1:0:0:0: [sde] …”。

在读写有坏块的 U盘时，不免会打印下面的 log。通过 opcode，就可以清楚是什么操作报的错。这里 opcode=0x28，即 READ(10)。

1. sd 0:0:0:0: [sda] tag#0 CDB: opcode=0x28 28 00 00 00 2b 09 00 00 1d 00

複製代碼

我们还可以阅读 SCSI的 manual，确定这次的 READ(10) 想从 LBA 0x2b0900 读多 0x1d * block size的数据回来。

SCSI Operation Codes

READ10

USB Mass Storage 常用的 SCSI Operation Codes 包括下面这些：

指令代码	指令名称	指令说明
0x00	Test Unit Ready	查询设备是否ready
0x03	Request Sense	主机请求设备返回执行结果，及获取状态信息
0x12	Inquiry	获取设备信息
0x1A	Mode Sense(6)	向host传输参数
0x5A	Mode Sense(10)	向host传输参数
0x25	Read Capacity(10)	读取设备容量
0x28	Read(10)	Host从设备读取数据
0x2A	Write(10)	Host写数据到存储设备
0x23	Read Format Capacity	查询当前容量及可用空间
0x15	Mode Select(6)	允许Host对外部设备设置参数
0x55	Mode Select(10)	允许Host对外部设备设置参数
0x1E	Prevent/Allow Medium Removal	禁止/允许存储介质移动
0x1B	Start/Stop Uint	启动/停止存储单元电源（写保护）
0xA0	Report LUNs	索取设备的LUN数和LUN清单
0x2F	Verify	在存储中验证数据

下面是全部的 SCSI Operation Codes:

Code	Command
00	TEST UNIT READY (mandatory)
01	RECALIBRATE or REWIND
03	REQUEST SENSE (mandatory except RBC)
04	FORMAT UNIT
05	READ BLOCK LIMITS
07	REASSIGN BLOCKS
07	INITIALIZE ELEMENT STATUS
08	READ (6)
0A	WRITE (6)
0B	SEEK (6)
0F	READ REVERSE (6)
10	WRITE FILEMARKS (6)
11	SPACE (6)
12	INQUIRY (mandatory)
13	VERIFY(6)
14	RECOVER BUFFERED DATA
15	MODE SELECT (6)
16	RESERVE (6)
17	RELEASE (6)
18	COPY
19	ERASE (6)
1A	MODE SENSE (6)
1B	[START/STOP UNIT
1B	LOAD UNLOAD
1C	RECEIVE DIAGNOSTIC RESULTS
1D	SEND DIAGNOSTIC
1E	PREVENT/ALLOW MEDIUM REMOVAL
23	READ FORMAT CAPACITIES (MMC)
24	SET WINDOW
25	READ CAPACITY (10)
28	READ (10)
29	READ GENERATION
2A	WRITE (10)
2B	SEEK (10)
2C	ERASE (10)
2D	READ UPDATED BLOCK
2E	WRITE AND VERIFY (10)
2F	VERIFY (10)
30	SEARCH DATA HIGH (10)
31	SEARCH DATA EQUAL (10)
32	SEARCH DATA LOW (10)
33	SET LIMITS (10)
34	PRE-FETCH (10)
35	SYNCHRONIZE CACHE (10)
36	LOCK/UNLOCK CACHE (10)
37	READ DEFECT DATA (10)
37	INITIALIZE ELEMENT STATUS WITH RANGE
38	MEDIUM SCAN
39	COMPARE
3A	COPY AND VERIFY
3B	WRITE BUFFER
3C	READ BUFFER
3D	UPDATE BLOCK
3E	READ LONG
3F	WRITE LONG
40	CHANGE DEFINITION
41	WRITE SAME (10)
44	REPORT DENSITY SUPPORT
45	PLAY AUDIO (10)
46	GET CONFIGURATION
47	PLAY AUDIO MSF
48	AUDIO TRACK INDEX (not mentioned in T10 overview)
49	AUDIO TRACK RELATIVE 10 (not mentioned in T10 overview)
4A	GET EVENT STATUS NOTIFICATION
4B	PAUSE / RESUME
4C	LOG SELECT
4D	LOG SENSE
50	XDWRITE (10)
51	XPWRITE (10) /READ DISC INFORMATION CDB (in mmc5r02c 6.22.2)/
52	XDREAD (10)
53	XDWRITEREAD (10)
54	SEND OPC INFORMATION
55	MODE SELECT (10)
56	RESERVE (10)
57	RELEASE (10)
58	REPAIR TRACK
5A	MODE SENSE (10)
5B	CLOSE TRACK / SESSION
5C	READ BUFFER CAPACITY
5D	SEND CUE SHEET
5E	PERSISTENT RESERVE IN
5F	PERSISTENT RESERVE OUT
7E	EXTENDED CDB
7F	VARIABLE LENGTH CDB
80	XDWRITE EXTENDED (16)
80	WRITE FILEMARKS (16)
81	REBUILD (16)
81	READ REVERSE (16)
82	REGENERATE (16)
83	EXTENDED COPY
84	RECEIVE COPY RESULTS
85	ATA COMMAND PASS THROUGH (16)
86	ACCESS CONTROL IN
87	ACCESS CONTROL OUT
88	READ (16)
89	COMPARE AND WRITE
8A	WRITE (16)
8B	ORWRITE
8C	READ ATTRIBUTE
8D	WRITE ATTRIBUTE
8E	WRITE AND VERIFY (16)
8F	VERIFY (16)
90	PRE-FETCH (16)
91	SYNCHRONIZE CACHE (16)
91	SPACE (16)
92	LOCK UNLOCK CACHE (16)
93	WRITE SAME (16)
9E	SERVICE ACTION IN (16)
9F	SERVICE ACTION OUT (16)
A0	REPORT LUNS
A1	ATA COMMAND PASS THROUGH (12)
A2	SECURITY PROTOCOL IN
A2	SEND EVENT (not mentioned in T10 overview)
A3	MAINTENANCE IN
A4	MAINTENANCE OUT (REPORT_KEY)
A5	MOVE MEDIUM
A5	PLAY AUDIO 12 (not mentioned in T10 overview)
A6	EXCHANGE MEDIUM
A7	MOVE MEDIUM ATTACHED
A8	READ (12)
A9	SERVICE ACTION OUT (12)
A9	AUDIO TRACK RELATIVE 12 (not mentioned in T10 overview)
AA	WRITE (12)
AB	SERVICE ACTION IN (12)
AC	ERASE (12)
AD	READ DVD STRUCTURE
AE	WRITE AND VERIFY (12)
AF	VERIFY (12)
B0	SEARCH DATA HIGH (12)
B1	SEARCH DATA EQUAL (12)
B2	SEARCH DATA LOW (12)
B3	SET LIMITS (12)
B4	READ ELEMENT STATUS ATTACHED
B5	SECURITY PROTOCOL OUT
B6	SEND VOLUME TAG
B7	READ DEFECT DATA (12)
B8	READ ELEMENT STATUS
B9	READ CD MSF
BA	REDUNDANCY GROUP (IN)
BB	REDUNDANCY GROUP (OUT)
BC	SPARE (IN)
BC	PLAY CD (not mentioned in T10 overview)
BD	SPARE (OUT)
BE	VOLUME SET (IN)
BF	VOLUME SET (OUT)

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