linux-ext4 - Re: Question on resize2fs with "combination of flex_bg and !resize

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Message-ID: <20121108230308.GN19977@thunk.org>
Date:	Thu, 8 Nov 2012 18:03:08 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	Mark Casey <markc@...fiedgroup.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: Question on resize2fs with "combination of flex_bg and
 !resize_inode"

On Thu, Nov 08, 2012 at 02:03:38PM -0600, Mark Casey wrote:
> Regarding this patch to resize2fs:
> http://permalink.gmane.org/gmane.comp.file-systems.ext4/7379
> 
> In reading the comment, I was wondering if this problem scenario can
> also happen when shrinking an ext4 filesystem with this combination
> of features, or if it is only likely to be a problem when growing
> it?

It's only a problem when growing the file system.  The comment in the
patch explains the situation; when you are shrinking the file system,
there is never any need to move inode tables to make room for the new
block group descriptor blocks --- which are necessitated by the
additional block groups that come from growing the file system.

       	    	      	      	       - Ted
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