Re: [PATCH] target/iblock: Use -EAGAIN/-ENOMEM to propigate SAM BUSY/TASK_SET_FULL

[Hannes Reinecke <hare@suse.de>]

On 02/07/2016 07:22 AM, Nicholas A. Bellinger wrote:
> From: Nicholas Bellinger <nab@linux-iscsi.org>
> 
> This patch updates target/iblock backend driver code to
> check for bio completion status of -EAGAIN / -ENOMEM
> provided by raw block drivers and scsi devices, in order
> to generate the following SCSI status to initiators:
> 
>   - SAM_STAT_BUSY
>   - SAM_STAT_TASK_SET_FULL
> 
> Note these two SAM status codes are useful to signal to
> Linux SCSI host side that se_cmd should be retried
> again, or with TASK_SET_FULL case to attempt to lower
> our internal host LLD queue_depth and scsi_cmnd retry.
> 
> It also updates target_complete_cmd() to parse status
> when signalling success to target_completion_wq.
> 
> Cc: Christoph Hellwig <hch@lst.de>
> Cc: Hannes Reinecke <hare@suse.de>
> Cc: Sagi Grimberg <sagig@mellanox.com>
> Cc: Andy Grover <agrover@redhat.com>
> Cc: Mike Christie <mchristi@redhat.com>
> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
> ---
Reviewed-by: Hannes Reinecke <hare@suse.com>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		   Teamlead Storage & Networking
hare@suse.de			               +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
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