linux-ext4 - "- 8" in EXT2_MAX_BLOCKS_PER

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Message-ID: <4E931453.3010002@redhat.com>
Date:	Mon, 10 Oct 2011 10:50:43 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	ext4 development <linux-ext4@...r.kernel.org>
Subject: "- 8" in EXT2_MAX_BLOCKS_PER_GROUP

When looking at the maximal filesystem size issue, I found myself
wondering what the "- 8" is in here, it's not commented
or documented anywhere:

#define EXT2_MAX_BLOCKS_PER_GROUP(s)    (((1 << 16) - 8) *      \
                                          (EXT2_CLUSTER_SIZE(s) / \
                                           EXT2_BLOCK_SIZE(s)))


(pre-bigalloc, it was just ((1 << 16) - 8) )

Anyone know?

-Eric

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