linux-ext4 - Question on huge

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Date:	Fri, 10 Jul 2009 08:32:12 -0700
From:	Curt Wohlgemuth <curtw@...gle.com>
To:	ext4 development <linux-ext4@...r.kernel.org>
Subject: Question on huge_file

I apologize if this is a dumb question, but I'm having trouble
understanding the huge_file superblock flag.

I see how, if this flag is set, that the inode can have a size > 2**32
bytes, using the i_size_lo/i_size_high fields.

But since an ext4_extent only uses 32-bits for for its ee_block field
to represent the logical block, how can an extent describe any block
range of a file past the 4GiB boundary?

Am I missing something?

Thanks,
Curt
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