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scsi: Fix transfer length for READ POSITION commands. 

The transfer length depends on the specific service action
code, as defined in the SCSI stream commands spec section 7.7.
Up to now only the extended form was supported.

Signed-off-by: Christian Hoff <christian.hoff@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Christian Hoff 2012-06-14 15:55:28 +02:00 committed by Paolo Bonzini
parent 40723a99b8
commit 9ce1bb2d36
2 changed files with 23 additions and 1 deletions
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16
hw/scsi-bus.c
View File

@ -901,7 +901,21 @@ static int scsi_req_stream_length(SCSICommand *cmd, SCSIDevice *dev, uint8_t *bu
cmd->xfer = buf[13] | (buf[12] << 8);
break;
case READ_POSITION:
cmd->xfer = buf[8] | (buf[7] << 8);
switch (buf[1] & 0x1f) /* operation code */ {
case SHORT_FORM_BLOCK_ID:
case SHORT_FORM_VENDOR_SPECIFIC:
cmd->xfer = 20;
break;
case LONG_FORM:
cmd->xfer = 32;
break;
case EXTENDED_FORM:
cmd->xfer = buf[8] | (buf[7] << 8);
break;
default:
return -1;
}
break;
case FORMAT_UNIT:
cmd->xfer = buf[4] | (buf[3] << 8);

8
hw/scsi-defs.h
View File

@ -146,6 +146,14 @@
*/
#define SAI_READ_CAPACITY_16 0x10
/*
* READ POSITION service action codes
*/
#define SHORT_FORM_BLOCK_ID 0x00
#define SHORT_FORM_VENDOR_SPECIFIC 0x01
#define LONG_FORM 0x06
#define EXTENDED_FORM 0x08
/*
* SAM Status codes
*/