Re: [Qemu-devel] Re: [PATCH 1/2] [scsi-bus]: Add PR-OUT and PR-IN case for SCSIRequest xfer and xfer_mode setup

[Kevin Wolf <kwolf@redhat.com>]

Am 04.06.2010 16:06, schrieb Kevin Wolf:
> Am 31.05.2010 03:43, schrieb Nicholas A. Bellinger:
>> From: Nicholas Bellinger <nab@linux-iscsi.org>
>>
>> This patch updates hw/scsi-bus.c to add PERSISTENT_RESERVE_OUT and PERSISTENT_RESERVE_IN
>> case in scsi_req_length() to extra the incoming buffer length into SCSIRequest->cmd.xfer,
>> and adds a second PERSISTENT_RESERVE_OUT case in scsi_req_xfer_mode() in order to properly
>> set SCSI_XFER_TO_DEV for WRITE data.
>>
>> Tested with Linux KVM guests and Megasas 8708EM2 HBA emulation and TCM_Loop target ports.
>>
>> Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
>> ---
>>  hw/scsi-bus.c |    5 +++++
>>  1 files changed, 5 insertions(+), 0 deletions(-)
>>
>> diff --git a/hw/scsi-bus.c b/hw/scsi-bus.c
>> index b8e4b71..75ec74e 100644
>> --- a/hw/scsi-bus.c
>> +++ b/hw/scsi-bus.c
>> @@ -325,6 +325,10 @@ static int scsi_req_length(SCSIRequest *req, uint8_t *cmd)
>>      case INQUIRY:
>>          req->cmd.xfer = cmd[4] | (cmd[3] << 8);
>>          break;
>> +    case PERSISTENT_RESERVE_OUT:
>> +    case PERSISTENT_RESERVE_IN:
>> +        req->cmd.xfer = cmd[8] | (cmd[7] << 8);
> 
> Maybe I'm missing something, but isn't exactly the same value set in the
> switch block above? (for cmd[0] >> 5 == 2)

Nicholas? This isn't applied yet because I'm waiting for your answer.

Is there a reason why it makes sense to do it explicitly here instead
using the generic code a few lines above? I think the same applied to
patch 2/2.

Kevin