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Re: [dm-devel] [PATCH 3/3] scsi_dh_rdac : decide on whether to send mode select or not based on operating mode



> -----Original Message-----
> From: linux-scsi-owner vger kernel org [mailto:linux-scsi-
> owner vger kernel org] On Behalf Of Moger, Babu
> Sent: Friday, April 08, 2011 12:40 PM
> To: linux-scsi vger kernel org; device-mapper development
> Cc: Dachepalli, Sudhir; Qi, Yanling; Chauhan, Vijay; Stankey, Robert;
> Arumugam, Anburaja; Krishnasamy, Somasundaram
> Subject: [PATCH 3/3] scsi_dh_rdac : decide on whether to send mode
> select or not based on operating mode
> 
> Based on the operating modes, handler decides whether to send mode
> select or not. Purpose here is to reduce
> io-shipping as much as possible whenever there is an option.
> 
> Signed-off-by: Babu Moger <babu moger lsi com>
> Reviewed-by: Yanling Qi <yanling qi lsi com>
> Reviewed-by: Sudhir Dachepalli <Sudhir Dachepalli lis com>
> Reviewed-by: Somasundaram Krishnasamy <Somasundaram Krishnasamy lsi com>
> Reviewed-by: Bob Stankey <Robert Stankey lsi com>
> Reviewed-by: Vijay Chauhan <Vijay Chauhan lsi com>

Tested-by: Charles Cummins <Charles cummins lsi com>

> 
> ---
> --- linux-2.6.38/drivers/scsi/device_handler/scsi_dh_rdac.c.orig	2011-
> 03-17 16:57:51.000000000 -0500
> +++ linux-2.6.38/drivers/scsi/device_handler/scsi_dh_rdac.c	2011-03-17
> 16:59:11.000000000 -0500
> @@ -670,12 +670,27 @@ static int rdac_activate(struct scsi_dev
>  {
>  	struct rdac_dh_data *h = get_rdac_data(sdev);
>  	int err = SCSI_DH_OK;
> +	int act = 0;
> 
>  	err = check_ownership(sdev, h);
>  	if (err != SCSI_DH_OK)
>  		goto done;
> 
> -	if (h->lun_state == RDAC_LUN_UNOWNED) {
> +	switch (h->mode) {
> +	case RDAC_MODE:
> +		if (h->lun_state == RDAC_LUN_UNOWNED)
> +			act = 1;
> +		break;
> +	case RDAC_MODE_IOSHIP:
> +		if ((h->lun_state == RDAC_LUN_UNOWNED) &&
> +		    (h->preferred == RDAC_PREFERRED))
> +			act = 1;
> +		break;
> +	default:
> +		break;
> +	}
> +
> +	if (act) {
>  		err = queue_mode_select(sdev, fn, data);
>  		if (err == SCSI_DH_OK)
>  			return 0;
> 
> 
> --
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