From: Jens Axboe <axboe@suse.de>
To: Douglas Gilbert <dougg@torque.net>
Cc: linux-scsi@vger.kernel.org
Subject: Re: extracting resid from struct scsi_cmnd
Date: Sun, 28 Nov 2004 10:12:05 +0100 [thread overview]
Message-ID: <20041128091201.GA10485@suse.de> (raw)
In-Reply-To: <41A9319F.9070206@torque.net>
On Sun, Nov 28 2004, Douglas Gilbert wrote:
> Jens,
> While on the subject of extracting info from struct scsi_cmnd
> I have noticed that scsi_cmnd::resid doesn't make it into
> sg_io_hdr::resid in the block layer SG_IO implementation.
> "rq->data_len" is put there instead and it invariably has a
> value of 0.
>
> "struct request" does not have a 'resid' field which is defined
> as the number of bytes requested to be transferred less the actual
> number transferred.
->data_len is that value, after execution of the request. If rq->data_len
== 0 for a SCSI request that with residual bytes, then that's a bug.
--
Jens Axboe
next prev parent reply other threads:[~2004-11-28 9:14 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-27 12:42 extracting infos from struct scsi_cmnd Tommaso Moroni
2004-11-27 15:48 ` Jens Axboe
2004-11-28 2:02 ` extracting resid " Douglas Gilbert
2004-11-28 9:12 ` Jens Axboe [this message]
2004-11-28 13:01 ` [PATCH] " Douglas Gilbert
2004-11-28 14:59 ` Jens Axboe
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