linux-kernel - Re: [PATCH 1/5] zram: remove the call to page_endio in the bio end

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Date:   Thu, 30 Mar 2023 01:53:22 +0200
From:   Christoph Hellwig <hch@....de>
To:     Pankaj Raghav <p.raghav@...sung.com>
Cc:     Matthew Wilcox <willy@...radead.org>,
        Christoph Hellwig <hch@....de>, martin@...ibond.com,
        axboe@...nel.dk, minchan@...nel.org, akpm@...ux-foundation.org,
        hubcap@...ibond.com, viro@...iv.linux.org.uk,
        senozhatsky@...omium.org, brauner@...nel.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        mcgrof@...nel.org, linux-block@...r.kernel.org,
        gost.dev@...sung.com, linux-mm@...ck.org, devel@...ts.orangefs.org
Subject: Re: [PATCH 1/5] zram: remove the call to page_endio in the bio
 end_io handler

On Tue, Mar 28, 2023 at 06:17:11PM +0200, Pankaj Raghav wrote:
> >>  	if (!parent)
> >> -		bio->bi_end_io = zram_page_end_io;
> >> +		bio->bi_end_io = zram_read_end_io;
> > 
> > Can we just do:
> > 
> > 	if (!parent)
> > 		bio->bi_end_io = bio_put;
> > 
> 
> Looks neat. I will wait for Christoph to comment whether just a bio_put() call
> is enough in this case for non-chained bios before making this change for the
> next version.

It is enough in the sense of keeping the previous behavior there.
It is not enough in the sense that the code is still broken as the
callers is never notified of the read completion.  So I think for the
purpose of your series we're fine and can go ahead with this version
for now.

> 
> Thanks.
---end quoted text---