[dm-devel] Re: [PATCH 3/7] scsi_dh: add generic SPC-3 alua handler
Hannes Reinecke
hare at suse.de
Thu May 15 08:13:18 UTC 2008
Chandra Seetharaman wrote:
> I do not know the functionality of this module. So, my comments are only
> related to code.
>
> blk_request_rq() frees up the request before it returns (in
> blk_end_sync_rq()). So, there is no need for blk_put_request().
>
Indeed. But this opens up another question:
By the time blk_execute_rq() returns, the request is already
put back onto the queue.
That means that I shouldn't access rq->errors any more, as
the request might have been reused already.
But blk_execute_rq() returns -EIO for any error, making it
impossible to signal a proper error here.
So how do I get the contents of rq->errors safely?
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
hare at suse.de +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Markus Rex, HRB 16746 (AG Nürnberg)
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