linux-ext4 - "block_dump, bd" in debugfs

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Message-ID: <20130627030513.217820@gmx.com>
Date:	Wed, 26 Jun 2013 23:05:13 -0400
From:	"jon ernst" <jonernst07@....com>
To:	linux-ext4@...r.kernel.org
Subject: "block_dump, bd" in debugfs

Hi, 
When I use "block_dump" to dump certain block. I got 12288 bytes dumped. 
But I checked my block_size, it is 4k.
At debugfs interactive prompt, it says "Dump contents of a block". So I am confused here. 
 I read the code, it has    for (i=0; i<current_fs->blocksize; i+=16) ,I don't understand why I can get 12k output.

Also at the beginning of each line. The output pattern is "0000, 0020, 0040, 0060, 0100, 0120", where are numbers such as"0080,"?

Thanks in advance for any explanation.

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