[8710] in linux-scsi channel archive
Re: question on short transfers
daemon@ATHENA.MIT.EDU (Douglas Gilbert)
Tue Apr 25 09:34:24 2000
Message-ID: <39059E0B.993A7869@interlog.com>
Date: Tue, 25 Apr 2000 09:30:51 -0400
From: Douglas Gilbert <dgilbert@interlog.com>
MIME-Version: 1.0
To: Oliver Neukum <Oliver.Neukum@lrz.uni-muenchen.de>
Cc: linux-scsi@vger.rutgers.edu
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Oliver Neukum wrote:
>
> Hi,
>
> how do I indicate to the higher layers that less data than requested has
> been transfered ?
In lk 2.3/2.4 with:
int resid; /* Number of bytes requested to be
transferred less actual number
transferred (0 if not supported) */
See aha152x or advansys drivers for examples of this. The sg driver
since lk 2.3.43 makes resid available to user applications.
Also in lk 2.2, 2.3/2.4 there is:
unsigned underflow; /* Return error if less than
this amount is transfered */
See the aic7xxx driver for an example.
Doug Gilbert
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