linux-ext4 - Re: [PATCH] ext4: Checksum the block bitmap properly with bigalloc enabled.

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Message-ID: <20121022043328.GC4768@thunk.org>
Date:	Mon, 22 Oct 2012 00:33:28 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Tao Ma <tm@....ma>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext4: Checksum the block bitmap properly with bigalloc
 enabled.

On Mon, Oct 15, 2012 at 09:01:33PM +0800, Tao Ma wrote:
> From: Tao Ma <boyu.mt@...bao.com>
> 
> In mke2fs, we only checksum the whole bitmap block and it is right.
> While in the kernel, we use EXT4_BLOCKS_PER_GROUP to indicate the
> size of the checksumed bitmap which is wrong when we enable bigalloc.
> The right size should be EXT4_CLUSTERS_PER_GROUP and this patch fixes
> it.
> 
> Also as every caller of ext4_block_bitmap_csum_set and
> ext4_block_bitmap_csum_verify pass in EXT4_BLOCKS_PER_GROUP(sb)/8,
> we'd better removes this parameter and sets it in the function itself.
> 
> Cc: "Theodore Ts'o" <tytso@....edu>
> Signed-off-by: Tao Ma <boyu.mt@...bao.com>

Thanks, applied!

						- Ted
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