Date: Thu, 22 Nov 2018 12:03:15 +0100
From: Christoph Hellwig <hch@lst.de>
To: Ming Lei <ming.lei@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>, linux-block@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        Theodore Ts'o <tytso@mit.edu>, Omar Sandoval <osandov@fb.com>,
        Sagi Grimberg <sagi@grimberg.me>,
        Dave Chinner <dchinner@redhat.com>,
        Kent Overstreet <kent.overstreet@gmail.com>,
        Mike Snitzer <snitzer@redhat.com>, dm-devel@redhat.com,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        linux-fsdevel@vger.kernel.org, Shaohua Li <shli@kernel.org>,
        linux-raid@vger.kernel.org, David Sterba <dsterba@suse.com>,
        linux-btrfs@vger.kernel.org,
        "Darrick J . Wong" <darrick.wong@oracle.com>,
        linux-xfs@vger.kernel.org, Gao Xiang <gaoxiang25@huawei.com>,
        Christoph Hellwig <hch@lst.de>, linux-ext4@vger.kernel.org,
        Coly Li <colyli@suse.de>, linux-bcache@vger.kernel.org,
        Boaz Harrosh <ooo@electrozaur.com>,
        Bob Peterson <rpeterso@redhat.com>, cluster-devel@redhat.com
Subject: Re: [PATCH V11 12/19] block: allow bio_for_each_segment_all() to
 iterate over multi-page bvec
Message-ID: <20181122110315.GA30369@lst.de>
References: <20181121032327.8434-1-ming.lei@redhat.com> <20181121032327.8434-13-ming.lei@redhat.com>
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> +/* used for chunk_for_each_segment */
> +static inline void bvec_next_segment(const struct bio_vec *bvec,
> +				     struct bvec_iter_all *iter_all)

FYI, chunk_for_each_segment doesn't exist anymore, this is
bvec_for_each_segment now.  Not sure the comment helps much, though.

> +{
> +	struct bio_vec *bv = &iter_all->bv;
> +
> +	if (bv->bv_page) {
> +		bv->bv_page += 1;

I think this needs to use nth_page() given that with discontigmem
page structures might not be allocated contigously.