linux-ext4 - Re: [PATCH] ext4: fix the free blocks calculation for ext3 file systems w/ uninit

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Message-ID: <20120607141051.GB2864@thunk.org>
Date:	Thu, 7 Jun 2012 10:10:51 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Sander Eikelenboom <linux@...elenboom.it>
Cc:	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	stable@...nel.org, Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] ext4: fix the free blocks calculation for ext3 file
 systems w/ uninit_bg

On Thu, Jun 07, 2012 at 04:01:16PM +0200, Sander Eikelenboom wrote:
> 
> BTW: Is there any (real) advantage to recreate the FS using the ext4's flex_bg instead of converting the ext3 to ext4 and using ext3 uninit_bg ?
> 

It speeds up e2fsck times, and it allows for more contiguous free
space in the file system.  So yes, there is an advantage to using a
native ext4 file system --- but of course that's a pain in the tuckus
for people with large RAID arrays.  Which also explains why we were
mainly seeing this bug reported with people using large RAID devices;
those are the people who are most likely to want to do an
upgrade-in-place, because it's too painful to recreate and then copy
the data.  Which is fine; one of the major features of ext4 is to be
able to support upgrades-in-place from ext3.

Unfortunately, while I had native (unconverted) ext3 file systems in
my test matrix, I didn't have converted ext3 file system formats in my
regular regression test suite script.  That is going to be fixed
shortly....

		   	   	   	    - Ted
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