linux-ext4 - Re: [PATCH] e2fsprogs: detect zoned disks and prevent their raw use

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Date:   Fri, 15 Jun 2018 23:06:01 +0200
From:   "Luis R. Rodriguez" <mcgrof@...nel.org>
To:     "Luis R. Rodriguez" <mcgrof@...nel.org>
Cc:     tytso@....edu, jack@...e.com, adilger.kernel@...ger.ca,
        linux-ext4@...r.kernel.org, snitzer@...hat.com, hare@...e.de,
        axboe@...nel.dk, mwilck@...e.com,
        Damien Le Moal <damien.lemoal@....com>,
        Bart Van Assche <Bart.VanAssche@....com>
Subject: Re: [PATCH] e2fsprogs: detect zoned disks and prevent their raw use

On Fri, Jun 15, 2018 at 01:56:30PM -0700, Luis R. Rodriguez wrote:
> +static errcode_t is_zoned_disk(const char *path)
> +{
> +	char str[PATH_MAX];
> +	char *devname = basename(path);
> +	FILE *file;
> +	int len;
> +
> +	len = snprintf(str, sizeof(str), "/sys/block/%s/queue/zoned", devname);
> +
> +	/* Indicates truncation */
> +	if (len >= PATH_MAX)
> +		return EXT2_ET_INVALID_ARGUMENT;
> +
> +	file = fopen(str, "r");
> +	if (!file)
> +		return 0;
> +
> +	fclose(file);
> +
> +	return EXT2_ET_ZONE_UNSUPPORTED;
> +}


Seems this needs to be extended to ensure this is host-managed only, will spin
a v2 later.

  Luis