linux-ext4 - backup of the last group'descriptor when it is the 1st group of a meta

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Message-ID: <CAGBYx2bbucN5MN0MfRXK3=x74mY3-+foGuQc2Gd4oQzJAzPVKg@mail.gmail.com>
Date:	Tue, 27 Mar 2012 22:47:34 +0800
From:	Yongqiang Yang <xiaoqiangnk@...il.com>
To:	Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc:	"Ted Ts'o" <tytso@....edu>, Andreas Dilger <adilger@...ger.ca>
Subject: backup of the last group'descriptor when it is the 1st group of a meta_bg

Hi Ted, Andreas and List,

As Andreas pointed out last year, if the last group is the 1st group
in a meta bg, then its group desc has no backup.
With meta_bg resizing inode is useless,  I had a thought that we store
a backup group descriptor of the last group in the resizing inode？
What's your opinions?

Yongqiang.
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