linux-ext4 - Why can not we trust free blocks count in BLOCK

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Message-ID: <CAGBYx2avvn9t0AUST1zVW1Yw9Bd7xntOCHOj0HjUMBNxEXLV5Q@mail.gmail.com>
Date:	Sun, 10 Jul 2011 11:19:06 +0800
From:	Yongqiang Yang <xiaoqiangnk@...il.com>
To:	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Why can not we trust free blocks count in BLOCK_UNINIT group descriptor

Hi,

Now ext4 gets free blocks count directly from a group descriptor
without BLOCK_UNINIT, however calculates free blocks count for a group
descriptor with BLOCK_UNINIT via ext4_init_block_bitmap().   The group
descriptors with BLOCK_UNINIT have group check sums.   Now comes the
question,  why do not we get it directly from group descriptor?

Yongqiang.
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