linux-kernel - Re: [PATCH v2 15/26] block: Add bio_copy

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Message-ID: <20120921000632.GS7264@google.com>
Date:	Thu, 20 Sep 2012 17:06:32 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Kent Overstreet <koverstreet@...gle.com>
Cc:	linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org,
	dm-devel@...hat.com, axboe@...nel.dk, neilb@...e.de
Subject: Re: [PATCH v2 15/26] block: Add bio_copy_data()

Hello,

On Mon, Sep 10, 2012 at 05:22:26PM -0700, Kent Overstreet wrote:
> +void bio_copy_data(struct bio *dst, struct bio *src)
> +{
...
> +		src_p = kmap_atomic(src_bv->bv_page);
> +		dst_p = kmap_atomic(dst_bv->bv_page);
> +
> +		memcpy(dst_p + dst_bv->bv_offset,
> +		       src_p + src_bv->bv_offset,
> +		       bytes);
> +
> +		kunmap_atomic(dst_p);
> +		kunmap_atomic(src_p);

Wrap these in preempt_disable/enable() to allow the function to be
called from any context?

Thanks.

-- 
tejun
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