linux – SCSI读取(10)和写入(10)与SCSI通用接口

这是我的scsi阅读：

#define READ_REPLY_LEN 32
#define READ_CMDLEN 10
void scsi_read()
{
  unsigned char Readbuffer[ SCSI_OFF + READ_REPLY_LEN ];
  unsigned char cmdblk [ READ_CMDLEN ] =
      {        0x28,/* command */
                  0,/* lun/reserved */
                  0,/* lba */
                  0,/* reserved */
                  0,/* transfer length */
     READ_REPLY_LEN,/* transfer length */
                  0 };/* reserved/flag/link */
  memset(Readbuffer,sizeof(Readbuffer));
  memcpy( cmd + SCSI_OFF,cmdblk,sizeof(cmdblk) );

  /*
   * +------------------+
   * | struct sg_header | <- cmd
   * +------------------+
   * | copy of cmdblk   | <- cmd + SCSI_OFF
   * +------------------+
   */

  if (handle_scsi_cmd(sizeof(cmdblk),cmd,sizeof(Readbuffer) - SCSI_OFF,Readbuffer )) {
      fprintf( stderr,"read failedn" );
      exit(2);
  }
  hex_dump(Readbuffer,sizeof(Readbuffer));
}

这是我的scsi写道：

void scsi_write ( void )
{
  unsigned char Writebuffer[SCSI_OFF];
  unsigned char cmdblk [] =
      {        0x2A,/* 0: command */
                  0,/* 1: lun/reserved */
                  0,/* 2: LBA */
                  0,/* 3: LBA */
                  0,/* 4: LBA */
                  0,/* 5: LBA */
                  0,/* 6: reserved */
                  0,/* 7: transfer length */
                  0,/* 8: transfer length */
                  0 };/* 9: control */

  memset(Writebuffer,sizeof(Writebuffer));
  memcpy( cmd + SCSI_OFF,sizeof(cmdblk) );
  cmd[SCSI_OFF+sizeof(cmdblk)+0] = 'A';
  cmd[SCSI_OFF+sizeof(cmdblk)+1] = 'b';
  cmd[SCSI_OFF+sizeof(cmdblk)+2] = 'c';
  cmd[SCSI_OFF+sizeof(cmdblk)+3] = 'd';
  cmd[SCSI_OFF+sizeof(cmdblk)+4] = 'e';
  cmd[SCSI_OFF+sizeof(cmdblk)+5] = 'f';
  cmd[SCSI_OFF+sizeof(cmdblk)+6] = 'g';
  cmd[SCSI_OFF+sizeof(cmdblk)+7] = 0;
  /*
   * +------------------+
   * | struct sg_header | <- cmd
   * +------------------+
   * | copy of cmdblk   | <- cmd + SCSI_OFF
   * +------------------+
   * | data to write    | 
   * +------------------+
   */

  if (handle_scsi_cmd(sizeof(cmdblk),8,sizeof(Writebuffer) - SCSI_OFF,Writebuffer )) {
      fprintf( stderr,"write failedn" );
      exit(2);
  }
}

在下面的例子中我做了

> scsi阅读
> scsi写道
> scsi阅读

然后我打印写入的数据的十六进制(scsi写入)和读取的内容(scsi读取)

Read(10)
[0000]   00 00 00 44 00 00 00 44   00 00 00 00 00 00 00 00   ...D...D ........
[0010]   00 2C 00 00 00 00 00 00   00 00 00 00 00 00 00 00   ........ ........
[0020]   00 00 00 00 00 00 00 00   00 00 00 00 00 00 00 00   ........ ........
[0030]   00 00 00 00 00 00 00 00   00 00 00 00 00 00 00 00   ........ ........
[0040]   00 00 00 00                                         ....

Write(10):
[0000]   00 00 00 00 00 00 00 24   00 00 00 00 00 00 00 00   ........ ........
[0010]   00 00 00 00 00 00 00 00   00 00 00 00 00 00 00 00   ........ ........
[0020]   00 00 00 00 2A 00 00 00   00 00 00 00 00 00 41 62   ........ ......Ab
[0030]   63 64 65 66 67 00                                   cdefg.

Read(10):
[0000]   00 00 00 44 00 00 00 44   00 00 00 00 00 00 00 00   ...D...D ........
[0010]   04 00 20 00 70 00 02 00   00 00 00 0A 00 00 00 00   ....p... ........
[0020]   04 00 00 00 41 62 63 64   65 66 67 00 00 00 00 00   ....Abcd efg.....
[0030]   00 00 00 00 00 00 00 00   00 00 00 00 00 00 00 00   ........ ........
[0040]   00 00 00 00                                         ....

再次运行三个命令,我应该在第一次读取时阅读Abcdefg.对？但是再次运行它们不会改变任你现在可以假设,我使用的内存仍然是以前功能的数据,但即使我在sys_read()发生之前运行memset(Readbuff,sizeof(Readbuff)),我也会得到相同的结果.

我假设,我尝试写的LBA可能被禁止写,我读了缓存.但是,从0x00-0xFF对LBA地址进行交互不会改变任何东西 – 这意味着,我读取了相同的数据(Abcdefg).

您是否知道使用scsi通用接口进行scsi读取或写入的示例实现？