linux-kernel - Re: [PATCH] Block layer: separate out queue-oriented ioctls

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Date:	Sun, 18 Feb 2007 19:27:23 +0100
From:	Joerg.Schilling@...us.fraunhofer.de (Joerg Schilling)
To:	stern@...land.harvard.edu, dougg@...que.net
Cc:	linux-kernel@...r.kernel.org, jens.axboe@...cle.com,
	James.Bottomley@...eleye.com
Subject: Re: [PATCH] Block layer: separate out queue-oriented ioctls

Alan Stern <stern@...land.harvard.edu> wrote:

> > Alternatively the SG_GET_RESERVED_SIZE ioctl could be
> > modified to yield no more than max_sectors*512 .
>
> There should be one single ioctl which can be applied uniformly to all
> CD-type devices (in fact, to all devices using a request_queue) to learn
> max_sectors.  This rules out using SG_GET_RESERVED_SIZE.

This has nothing to do with CD-type devices!
It is related to SCSI tansport.

> Furthermore, if you changed SG_GET_RESERVED_SIZE in this way you would 
> only increase the confusion.  The reserved size isn't directly related to 
> the maximum allowed DMA length, and there's no point pretending it is.  
> What if it turns out that the reserved size is smaller than max_sectors?  
> Then you'd force user programs to do I/O in chunks that were smaller than 
> necessary.

It would not increase confusion but reduce confusion because all
programs would later behave correctly without the need to change them.

Jörg

-- 
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