[PATCHv3 4/4] scsi: handle zone resources errors

[Damien Le Moal]

On 2020/09/18 8:18, Keith Busch wrote:
> From: Damien Le Moal <damien.lemoal at wdc.com>
> 
> ZBC or ZAC disks that have a limit on the number of open zones may fail
> a zone open command or a write to a zone that is not already implicitly
> or explicitly open if the total number of open zones is already at the
> maximum allowed.
> 
> For these operations, instead of returning the generic BLK_STS_IOERR,
> return BLK_STS_ZONE_OPEN_RESOURCE which is returned as -ETOOMANYREFS to
> the I/O issuer, allowing the device user to act appropriately on these
> relatively benign zone resource errors.
> 
> Cc: Christoph Hellwig <hch at lst.de>
> Cc: Johannes Thumshirn <Johannes.Thumshirn at wdc.com>
> Signed-off-by: Damien Le Moal <damien.lemoal at wdc.com>

Shouldn't you add your signed-off-by here ?

> ---
>  drivers/scsi/scsi_lib.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
> index 7affaaf8b98e..c129ac6666da 100644
> --- a/drivers/scsi/scsi_lib.c
> +++ b/drivers/scsi/scsi_lib.c
> @@ -758,6 +758,15 @@ static void scsi_io_completion_action(struct scsi_cmnd *cmd, int result)
>  			/* See SSC3rXX or current. */
>  			action = ACTION_FAIL;
>  			break;
> +		case DATA_PROTECT:
> +			action = ACTION_FAIL;
> +			if ((sshdr.asc == 0x0C && sshdr.ascq == 0x12) ||
> +			    (sshdr.asc == 0x55 &&
> +			     (sshdr.ascq == 0x0E || sshdr.ascq == 0x0F))) {
> +				/* Insufficient zone resources */
> +				blk_stat = BLK_STS_ZONE_OPEN_RESOURCE;
> +			}
> +			break;
>  		default:
>  			action = ACTION_FAIL;
>  			break;
> 


-- 
Damien Le Moal
Western Digital Research