linux-ext4 - Re: [RFC] ext4-locality-groups patch

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Message-ID: <m3odq7zw1d.fsf@bzzz.home.net>
Date:	Wed, 13 Dec 2006 17:54:06 +0300
From:	Alex Tomas <alex@...sterfs.com>
To:	Valerie Clement <valerie.clement@...l.net>
Cc:	Alex Tomas <alex@...sterfs.com>, linux-ext4@...r.kernel.org
Subject: Re: [RFC] ext4-locality-groups patch

>>>>> Valerie Clement (VC) writes:

 VC> Alex Tomas wrote:
 >>>>>>> Valerie Clement (VC) writes:
 >> 
 VC> Hi Alex,
 VC> I did the following test:
 VC> # mkfs /dev/sdc1
 VC> # mount -t ext4dev -o extents,mballoc,delalloc /dev/sdc1 /test
 VC> # dumpe2fs -h /dev/sdc1
 VC> # cp linux.tar /test
 VC> # tar xf /test/linux.tar
 VC> # dumpe2fs -h /dev/sdc1
 >> 
 VC> The "Free blocks" and "Free inodes" counters in the dumpe2fs output
 VC> did not change after running the cp and tar commands.
 >> 
 >> sync should help, I think.

 VC> No, I've just tried, it does not change anything.

ah, it's simple. you're looking at superblock counters.
we don't update them every time. this was changed years
ago. try the same with regular ext3

thanks, Alex
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