linux-kernel - Re: [PATCH/RFC -nxt] mtd_blkdevs: Set GENHD_FL_NO

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Message-ID: <CAMuHMdWR3hwBho3wDBPjGm4q==qrQn3PLdZN9CfVwX-aOMUW0A@mail.gmail.com>
Date:   Fri, 3 Dec 2021 09:25:51 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Jens Axboe <axboe@...nel.dk>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Michael Walle <michael@...le.cc>,
        Pratyush Yadav <p.yadav@...com>,
        MTD Maling List <linux-mtd@...ts.infradead.org>,
        linux-block@...r.kernel.org,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH/RFC -nxt] mtd_blkdevs: Set GENHD_FL_NO_PART

Hi Christoph,

On Fri, Dec 3, 2021 at 7:57 AM Christoph Hellwig <hch@....de> wrote:
> I think we need the patch below to restore the old behavior where a
> partitions scan happens only for those sub-drivers that do report a
> partition shift.

Tested-by: Geert Uytterhoeven <geert+renesas@...der.be>

> MTD maintainers: is this intentional that raw mtdblock does not support
> partitions, but the various "FTL" modules do?
>
> diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
> index 113f86df76038..57a22d2ebaeca 100644
> --- a/drivers/mtd/mtd_blkdevs.c
> +++ b/drivers/mtd/mtd_blkdevs.c
> @@ -345,6 +345,8 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
>         gd->first_minor = (new->devnum) << tr->part_bits;
>         gd->minors = 1 << tr->part_bits;
>         gd->fops = &mtd_block_ops;
> +       if (!tr->part_bits)
> +               gd->flags |= GENHD_FL_NO_PART;

Move this into the "else" branch of the test below?

>         if (tr->part_bits)
>                 if (new->devnum < 26)

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds