linux-kernel - Re: [PATCH] mmc: card: Don't show eMMC RPMB and BOOT areas in /proc/partitions

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Date:   Tue, 27 Feb 2018 21:51:05 +0800
From:   Shawn Lin <shawn.lin@...k-chips.com>
To:     Harish Jenny K N <harish_kandiga@...tor.com>,
        adrian.hunter@...el.com
Cc:     ulf.hansson@...aro.org, linus.walleij@...aro.org,
        shawn.lin@...k-chips.com, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: card: Don't show eMMC RPMB and BOOT areas in
 /proc/partitions

在 2018/2/27 19:33, Harish Jenny K N 写道:
> From: Andrew Gabbasov <andrew_gabbasov@...tor.com>
> 
> Since RPMB area is accessible via special ioctl only and boot areas
> are unlikely to contain any partitions, exclude them all from listing
> in /proc/partitions. This will hide them from various user-level
> software (e.g. fdisk), thus avoiding unnecessary access attempts.
> 
> Signed-off-by: Andrew Gabbasov <andrew_gabbasov@...tor.com>
> Signed-off-by: Harish Jenny K N <harish_kandiga@...tor.com>
> ---
>   drivers/mmc/core/block.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
> index 20135a5..376e47e 100644
> --- a/drivers/mmc/core/block.c
> +++ b/drivers/mmc/core/block.c
> @@ -2341,7 +2341,8 @@ static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
>   	set_disk_ro(md->disk, md->read_only || default_ro);
>   	md->disk->flags = GENHD_FL_EXT_DEVT;
>   	if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
> -		md->disk->flags |= GENHD_FL_NO_PART_SCAN;
> +		md->disk->flags |= GENHD_FL_NO_PART_SCAN
> +				   | GENHD_FL_SUPPRESS_PARTITION_INFO;

I would prefer using GENHD_FL_HIDDEN instead of adding all these two
flags.

>   
>   	/*
>   	 * As discussed on lkml, GENHD_FL_REMOVABLE should:
> 


-- 
Best Regards
Shawn Lin