linux-kernel - Re: [PATCH] block: don't optimize for non-cloned bio in bio_get_last

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Message-ID: <56E4E575.5020303@kernel.dk>
Date:	Sat, 12 Mar 2016 20:58:45 -0700
From:	Jens Axboe <axboe@...nel.dk>
To:	Ming Lei <ming.lei@...onical.com>, linux-kernel@...r.kernel.org
Cc:	linux-block@...r.kernel.org, Christoph Hellwig <hch@...radead.org>,
	Sagi Grimberg <sagig@....mellanox.co.il>,
	Kent Overstreet <kent.overstreet@...il.com>,
	stable@...r.kernel.org
Subject: Re: [PATCH] block: don't optimize for non-cloned bio in
 bio_get_last_bvec()

On 03/12/2016 07:56 AM, Ming Lei wrote:
> For !BIO_CLONED bio, we can use .bi_vcnt safely, but it
> doesn't mean we can just simply return .bi_io_vec[.bi_vcnt - 1]
> because the start postion may have been moved in the middle of
> the bvec, such as splitting in the middle of bvec.

Added and tested.

-- 
Jens Axboe