linux-kernel - Re: [PATCH 1/2] block: handle the null_mapped flag correctly in blk_rq_map_user

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Date:	Wed, 11 Feb 2015 11:23:06 -0700
From:	Jens Axboe <axboe@...com>
To:	Christoph Hellwig <hch@....de>
CC:	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] block: handle the null_mapped flag correctly in blk_rq_map_user_iov

On 02/11/2015 06:07 AM, Christoph Hellwig wrote:
> The tape drivers (and the sg driver in a special case that doesn't matter
> here) use the null_mapped flag to tell blk_rq_map_user to not copy around
> any data into or out of the bounce buffers.  blk_rq_map_user_iov never
> got that treatment, which didn't matter until I refactored blk_rq_map_user
> to be implemented in terms of blk_rq_map_user_iov.

So this fixes a regression caused by:

commit ddad8dd0a162fde61646a627a3017c258601dc8a
Author: Christoph Hellwig <hch@....de>
Date:   Sun Jan 18 16:16:29 2015 +0100

     block: use blk_rq_map_user_iov to implement blk_rq_map_user

     Signed-off-by: Christoph Hellwig <hch@....de>
     Reviewed-by: Ming Lei <tom.leiming@...il.com>
     Signed-off-by: Jens Axboe <axboe@...com>

which we should probably note in the commit. I'll add that.


-- 
Jens Axboe

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