linux-kernel - Re: [PATCH 02/10] block: simplify bio_add

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Message-ID: <20150428121234.GA10479@lst.de>
Date:	Tue, 28 Apr 2015 14:12:34 +0200
From:	Christoph Hellwig <hch@....de>
To:	Ming Lin <mlin@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>,
	Jens Axboe <axboe@...nel.dk>,
	Kent Overstreet <kent.overstreet@...il.com>,
	Dongsu Park <dongsu.park@...fitbricks.com>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 02/10] block: simplify bio_add_page()

On Mon, Apr 27, 2015 at 11:48:29PM -0700, Ming Lin wrote:
> Note that removing call to ->merge_bvec_fn() is fine for
> bio_add_pc_page(), as SCSI devices usually don't even need that.
> Few exceptional cases like pscsi or osd are not affected either.

This explanation confuses me.  Based on my reading of the code I'd
replace it with something like:

Removing the call to ->merge_bvec_fn() is also fine, as no driver that
implements support for BLOCK_PC commands even has a ->merge_bvec_fn()
method.
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