linux-kernel - Re: [PATCH v3] UBIFS: compute KSA size and store in superblock

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Date:	Wed, 06 Jun 2012 17:30:20 +0300
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Joel Reardon <joel@...mbassador.com>
Cc:	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] UBIFS: compute KSA size and store in superblock

Hi Joel,

still a couple of small requests.

On Wed, 2012-06-06 at 12:03 +0200, Joel Reardon wrote:
> +	if (c->use_ubifsec && c->ksa_lebs <
> +	    ((c->leb_cnt * UBIFS_CRYPTO_KEYSIZE) >> UBIFS_BLOCK_SHIFT) +

Please, do something like this:

min_leb_cnt = (c->leb_cnt * UBIFS_CRYPTO_KEYSIZE) >> UBIFS_BLOCK_SHIFT;
if (c->use_ubifsec && c->ksa_lebs < min_leb_cnt)
	bah;
min_leb_cnt += UBIFS_KSA_ADD_LEBS;
if ()
	bah;

That would be more readable.

>  struct ubifs_sb_node {
>  	struct ubifs_ch ch;
> @@ -649,7 +652,9 @@ struct ubifs_sb_node {
>  	__le32 time_gran;
>  	__u8 uuid[16];
>  	__le32 ro_compat_version;
> -	__u8 padding2[3968];
> +	__le32 ksa_lebs;
> +	__u8 use_ubifsec;
> +	__u8 padding2[3963];
>  } __packed;

I've just noticed that we have the 'flags' field ane a set of flags like
"UBIFS_FLG_SPACE_FIXUP". For UBIFSEC, could you please add
"UBIFS_FLG_UBFSEC = 0x8" or you name it. This would be more consistent
way.

-- 
Best Regards,
Artem Bityutskiy

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