linux-kernel - Re: [PATCH v4 5/6] block: enable zone-append for iov

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Date:   Sun, 26 Jul 2020 16:20:14 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Kanchan Joshi <joshi.k@...sung.com>
Cc:     axboe@...nel.dk, viro@...iv.linux.org.uk, bcrl@...ck.org,
        willy@...radead.org, hch@...radead.org, Damien.LeMoal@....com,
        asml.silence@...il.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-aio@...ck.org,
        io-uring@...r.kernel.org, linux-block@...r.kernel.org,
        linux-api@...r.kernel.org, Selvakumar S <selvakuma.s1@...sung.com>,
        Nitesh Shetty <nj.shetty@...sung.com>,
        Javier Gonzalez <javier.gonz@...sung.com>
Subject: Re: [PATCH v4 5/6] block: enable zone-append for iov_iter of bvec
 type

On Fri, Jul 24, 2020 at 09:19:21PM +0530, Kanchan Joshi wrote:
> zone-append with bvec iov_iter gives WARN_ON, and returns -EINVAL.
> Add new helper to process such iov_iter and add pages in bio honoring
> zone-append specific constraints.
> This is used to enable zone-append with io-uring fixed-buffer.
> 
> Signed-off-by: Kanchan Joshi <joshi.k@...sung.com>
> Signed-off-by: Selvakumar S <selvakuma.s1@...sung.com>
> Signed-off-by: Nitesh Shetty <nj.shetty@...sung.com>
> Signed-off-by: Javier Gonzalez <javier.gonz@...sung.com>
> ---
>  block/bio.c | 31 ++++++++++++++++++++++++++++---
>  1 file changed, 28 insertions(+), 3 deletions(-)
> 
> diff --git a/block/bio.c b/block/bio.c
> index 0cecdbc..ade9da7 100644
> --- a/block/bio.c
> +++ b/block/bio.c
> @@ -975,6 +975,30 @@ static int __bio_iov_bvec_add_pages(struct bio *bio, struct iov_iter *iter)
>  	iov_iter_advance(iter, size);
>  	return 0;
>  }
> +static int __bio_iov_bvec_append_add_pages(struct bio *bio, struct iov_iter *iter)

Missing empty line and too long line, please stick to 80 chars for this
code.

Otherwise this looks sensible.