linux-ext4 - Re: Unused block group, but all blocks not free?

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Message-ID: <555CA52F.3010109@ubuntu.com>
Date:	Wed, 20 May 2015 11:15:59 -0400
From:	Phil Susi <psusi@...ntu.com>
To:	Theodore Ts'o <tytso@....edu>
CC:	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: Unused block group, but all blocks not free?

On 5/20/2015 11:10 AM, Theodore Ts'o wrote:
> Have you checked to see if the metadata for other block groups are
> taking up space in the block group.  This can happen when using the
> flex_bg layout.  (And without flex_bg, then *all* block groups will
> always have blocks in use, for their own metadata blocks.)

That was my first thought and no, they aren't.  The metadata is in bg 0 
and bg 32, not 25.  Even still, when the metadata is there, shouldn't 
the allocation bitmap mark those blocks as in use rather than be 
uninitialized?

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