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Reply-To: sandeen@redhat.com
Subject: Re: [PATCH 1/2] mke2fs: Warn if page size != blocksize when ecnrypt
 is enabled
To:     Lukas Czerner <lczerner@redhat.com>, linux-ext4@vger.kernel.org
References: <20190821131813.9456-1-lczerner@redhat.com>
From:   Eric Sandeen <esandeen@redhat.com>
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Message-ID: <30492603-86b4-8ea4-4573-6c2c4db12237@redhat.com>
Date:   Wed, 21 Aug 2019 10:19:12 -0500
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In-Reply-To: <20190821131813.9456-1-lczerner@redhat.com>
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On 8/21/19 8:18 AM, Lukas Czerner wrote:
> With encrypt feature enabled the file system block size must match
> system page size. Currently mke2fs will not complain at all when we try
> to create a file system that does not satisfy this requirement for the
> system. Add a warning for this case.
> 
> Signed-off-by: Lukas Czerner <lczerner@redhat.com>

This matches the warnings we give for block size > system page size, for example,
so this makes sense to me.

Reviewed-by: Eric Sandeen <sandeen@redhat.com>

> ---
>  misc/mke2fs.c | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/misc/mke2fs.c b/misc/mke2fs.c
> index d7cf257e..aa9590d8 100644
> --- a/misc/mke2fs.c
> +++ b/misc/mke2fs.c
> @@ -2468,6 +2468,26 @@ profile_error:
>  		      exit (1);
>  	}
>  
> +	/*
> +	 * Encrypt feature requires blocksize to be the same as page size,
> +	 * otherwise file system won't mount
> +	 */
> +	if (ext2fs_has_feature_encrypt(&fs_param) &&
> +	   (blocksize != sys_page_size)) {
> +		if (!force) {
> +			com_err(program_name, 0,
> +				_("Encrypt feature is enabled, but block size "
> +				  "(%dB) does not match system page size "
> +				  "(%dB)"),
> +				blocksize, sys_page_size);
> +			proceed_question(proceed_delay);
> +		}
> +		fprintf(stderr,_("Warning: Encrypt feature enabled, but block "
> +				 "size (%dB) does not match system page size "
> +				 "(%dB), forced to continue\n"),
> +			blocksize, sys_page_size);
> +	}
> +
>  	/* Don't allow user to set both metadata_csum and uninit_bg bits. */
>  	if (ext2fs_has_feature_metadata_csum(&fs_param) &&
>  	    ext2fs_has_feature_gdt_csum(&fs_param))
>