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

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Date:   Thu, 23 Mar 2023 10:30:35 -0400
From:   Mike Marshall <hubcap@...ibond.com>
To:     Pankaj Raghav <p.raghav@...sung.com>
Cc:     senozhatsky@...omium.org, viro@...iv.linux.org.uk, axboe@...nel.dk,
        willy@...radead.org, brauner@...nel.org, akpm@...ux-foundation.org,
        minchan@...nel.org, 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()

I have tested this patch on orangefs on top of 6.3.0-rc3, no
regressions.

It is very easy to build a single host orangefs test system on
a vm. There are instructions in orangefs.rst, and also I'd
be glad to help make them better...

-Mike

On Wed, Mar 22, 2023 at 9:50 AM Pankaj Raghav <p.raghav@...sung.com> wrote:
>
> It was decided to remove the page_endio() as per the previous RFC
> discussion[1] of this series and move that functionality into the caller
> itself. One of the side benefit of doing that is the callers have been
> modified to directly work on folios as page_endio() already worked on
> folios.
>
> mpage changes were tested with a simple boot testing. zram and orangefs is
> only build tested. No functional changes were introduced as a part of
> this AFAIK.
>
> Open questions:
> - Willy pointed out that the calls to folio_set_error() and
>   folio_clear_uptodate() are not needed anymore in the read path when an
>   error happens[2]. I still don't understand 100% why they aren't needed
>   anymore as I see those functions are still called in iomap. It will be
>   good to put that rationale as a part of the commit message.
>
> [1] https://lore.kernel.org/linux-mm/ZBHcl8Pz2ULb4RGD@infradead.org/
> [2] https://lore.kernel.org/linux-mm/ZBSH6Uq6IIXON%2Frh@casper.infradead.org/
>
> Pankaj Raghav (5):
>   zram: remove zram_page_end_io function
>   orangefs: use folios in orangefs_readahead
>   mpage: split bi_end_io callback for reads and writes
>   mpage: use folios in bio end_io handler
>   filemap: remove page_endio()
>
>  drivers/block/zram/zram_drv.c | 13 +----------
>  fs/mpage.c                    | 44 ++++++++++++++++++++++++++++-------
>  fs/orangefs/inode.c           |  9 +++----
>  include/linux/pagemap.h       |  2 --
>  mm/filemap.c                  | 30 ------------------------
>  5 files changed, 42 insertions(+), 56 deletions(-)
>
> --
> 2.34.1
>