linux-kernel - Re: [RFC PATCH 16/17] fs: convert buffer head etc. to use immutable biovecs API.

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Message-ID: <20141223105128.GE27600@infradead.org>
Date:	Tue, 23 Dec 2014 02:51:28 -0800
From:	Christoph Hellwig <hch@...radead.org>
To:	Dongsu Park <dongsu.park@...fitbricks.com>
Cc:	linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
	Kent Overstreet <kmo@...erainc.com>,
	Ming Lin <mlin@...ggr.net>, Al Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [RFC PATCH 16/17] fs: convert buffer head etc. to use immutable
 biovecs API.

On Mon, Dec 22, 2014 at 12:48:43PM +0100, Dongsu Park wrote:
> From: Kent Overstreet <kmo@...erainc.com>
> 
> Increase bio->bi_remaining instead of calling bio_get(),
> and call bio_end() instead of bio_put() upon buffer_head submission.

Nees an explanation on why this is done.

> Also make bio submission in kernel/power/block_io.c to properly submit
> bios by checking whether bio_chain is available or not.

Should be a separate patch.

And of course both should go into the preparation series of cleanups.

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