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Date:   Tue, 4 Apr 2023 08:09:17 -0700
From:   Christoph Hellwig <hch@infradead.org>
To:     Pankaj Raghav <p.raghav@samsung.com>
Cc:     axboe@kernel.dk, minchan@kernel.org, martin@omnibond.com,
        hubcap@omnibond.com, brauner@kernel.org, viro@zeniv.linux.org.uk,
        senozhatsky@chromium.org, akpm@linux-foundation.org,
        willy@infradead.org, hch@lst.de, devel@lists.orangefs.org,
        mcgrof@kernel.org, linux-block@vger.kernel.org, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, gost.dev@samsung.com,
        linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH v2 3/5] mpage: split bi_end_io callback for reads and
 writes
Message-ID: <ZCw9nWqgtLOt4+ia@infradead.org>
References: <20230403132221.94921-1-p.raghav@samsung.com>
 <CGME20230403132224eucas1p21fd296fbd4af70220331bb19023f4169@eucas1p2.samsung.com>
 <20230403132221.94921-4-p.raghav@samsung.com>
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>  		struct page *page = bv->bv_page;
> -		page_endio(page, bio_op(bio),
> +		page_endio(page, REQ_OP_READ,
> +			   blk_status_to_errno(bio->bi_status));

Nit: I think we can do without the page local variable here.

> +	bio_for_each_segment_all(bv, bio, iter_all) {
> +		struct page *page = bv->bv_page;
> +		page_endio(page, REQ_OP_WRITE,
>  			   blk_status_to_errno(bio->bi_status));

Same here.

>  	}
>  
> @@ -59,7 +73,11 @@ static void mpage_end_io(struct bio *bio)
>  
>  static struct bio *mpage_bio_submit(struct bio *bio)
>  {
> -	bio->bi_end_io = mpage_end_io;
> +	if (op_is_write(bio_op(bio)))
> +		bio->bi_end_io = mpage_write_end_io;
> +	else
> +		bio->bi_end_io = mpage_read_end_io;
> +

I'd also split mpage_bio_submit as all allers are clearly either
for reads or writes.