[dm-devel] [Patch] scsi_dh_rdac: retry IO for 06/3f/03 in rdac_check_sense fn
Chandra Seetharaman
sekharan at us.ibm.com
Tue Aug 10 01:47:38 UTC 2010
Vijay,
Since it has to be handled at SCSI (and it is a SCSI sense), shouldn't
we be retrying it at SCSI level. James, what is your opinion ?
It looks good to me as the effect is local to LSI rdac storage.
chandra
On Mon, 2010-08-02 at 13:07 +0530, Chauhan, Vijay wrote:
> Hi,
>
> This patch adds retry for the IO returned with 06/3f/03((INQUIRY_DATA_CHANGED)) sense code in rdac_check_sense(). IO returned with 06/3f/03 from controller are currently failed by scsi mid layer, as a reason momentarily path failure is noticed by DM multipath.
>
> Signed-off-by: Vijay Chauhan<vijay.chauhan at lsi.com>
> Reviewed-by: Babu Moger <babu.moger at lsi.com>
> Reviewed-by: Bob Stankey <Robert.stankey at lsi.com>
> ---
>
> diff -uprN linux-2.6.35-rc6-orig/drivers/scsi/device_handler/scsi_dh_rdac.c linux-2.6.35-rc6/drivers/scsi/device_handler/scsi_dh_rdac.c
> --- linux-2.6.35-rc6-orig/drivers/scsi/device_handler/scsi_dh_rdac.c 2010-07-22 15:13:38.000000000 -0400
> +++ linux-2.6.35-rc6/drivers/scsi/device_handler/scsi_dh_rdac.c 2010-07-27 12:13:58.000000000 -0400
> @@ -738,6 +738,11 @@ static int rdac_check_sense(struct scsi_
> * Quiescence in progress , just retry.
> */
> return ADD_TO_MLQUEUE;
> + if (sense_hdr->asc == 0x3f && sense_hdr->ascq == 0x03)
> + /*
> + * INQUIRY DATA has changed, retry again.
> + */
> + return ADD_TO_MLQUEUE;
> break;
> }
> /* success just means we do not care what scsi-ml does */
>
> --
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