linux-kernel - Re: [PATCH RFC] block: Eliminate first argument of submit

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Message-ID: <20140602113228.GA26951@infradead.org>
Date:	Mon, 2 Jun 2014 04:32:28 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Bart Van Assche <bvanassche@....org>
Cc:	Jens Axboe <axboe@...nel.dk>, Kent Overstreet <kmo@...erainc.com>,
	Shaohua Li <shli@...nel.org>,
	Christoph Hellwig <hch@...radead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC] block: Eliminate first argument of submit_bio()

On Mon, Jun 02, 2014 at 11:44:07AM +0200, Bart Van Assche wrote:
> The submit_bio() API is confusing. Merge functions like
> raid5_mergeable_bvec() can only work correctly if bi_rw is set
> before bio_add_page() has been called. submit_bio() modifies
> bi_rw after bio_add_page() has been called. Hence remove the
> first argument of submit_bio() and let the caller set bi_rw.
> Note: some but not all submit_bio() callers have been fixed
> such that bi_rw is set before bio_add_page() is called.

I like this a lot!

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