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

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Date:	Thu, 7 Jun 2012 16:39:55 +0200
From:	Sander Eikelenboom <linux@...elenboom.it>
To:	Ted Ts'o <tytso@....edu>
CC:	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] ext4: fix the free blocks calculation for ext3 file systems w/ uninit_bg

Thursday, June 7, 2012, 4:10:51 PM, you wrote:

> 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.

Ok thx for the info and the fix !

--
Sander

> 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




-- 
Best regards,
 Sander                            mailto:linux@...elenboom.it

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