linux-kernel - Re: [RFC v2 0/5] remove page

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Date:   Thu, 23 Mar 2023 15:33:19 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Pankaj Raghav <p.raghav@...sung.com>
Cc:     senozhatsky@...omium.org, viro@...iv.linux.org.uk, axboe@...nel.dk,
        brauner@...nel.org, akpm@...ux-foundation.org, minchan@...nel.org,
        hubcap@...ibond.com, martin@...ibond.com, mcgrof@...nel.org,
        devel@...ts.orangefs.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-block@...r.kernel.org, gost.dev@...sung.com
Subject: Re: [RFC v2 0/5] remove page_endio()

On Thu, Mar 23, 2023 at 04:00:37PM +0100, Pankaj Raghav wrote:
> > We don't need to set the error flag.  Only some filesystems still use
> > the error flag, and orangefs isn't one of them.  I'd like to get rid
> > of the error flag altogether, and I've sent patches in the past which
> > get us a lot closer to that desired outcome.  Not sure we're there yet.
> > Regardless, generic code doesn't check the error flag.
> 
> Thanks for the explanation. I think found the series you are referring here.
> 
> https://lore.kernel.org/linux-mm/20220527155036.524743-1-willy@infradead.org/#t
> 
> I see orangefs is still setting the error flag in orangefs_read_folio(), so
> it should be removed at some point?

Yes, OrangeFS only sets the error flag, it never checks it, so it never
needs to set it.

> I also changed mpage to **not set** the error flag in the read path. It does beg
> the question whether block_read_full_folio() and iomap_finish_folio_read() should
> also follow the suit.

Wrong.  mpage is used by filesystems which *DO* check the error flag.
You can't remove it being set until they're fixed to not check it.