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linux_sg.c modification for SCSI Test Unit Ready command

I've needed to add emulation for the SCSI Test Unit Ready command
to my backup server, so I could run Sony's tape diagnostics.
It's fairly simple, but is it the correct flag to use for that?
The patch below is what I'm using on my 4.0 backup server.


Index: linux_sg.c
RCS file: /cvsroot/src/sys/compat/linux/common/linux_sg.c,v
retrieving revision 1.8
diff -r1.8 linux_sg.c
>                       /* e.g. a SCSI WRITE command */
>                        /* e.g. a SCSI READ command */
>               case SG_DXFER_NONE:
>                       /* e.g. a SCSI Test Unit Ready command */
>                       req.flags = SCCMD_ESCAPE;
>                       break;

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