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Date:   Mon, 15 Aug 2022 13:03:37 +0200
From:   Stefan Wahren <>
To:     Jan Kara <>
Cc:, Ojaswin Mujoo <>,
        Harshad Shirwadkar <>,
        Theodore Ts'o <>,
        Ritesh Harjani <>,,
        Linux Kernel Mailing List <>,,,
        Florian Fainelli <>
Subject: Re: [Regression] ext4: changes to mb_optimize_scan cause issues on
 Raspberry Pi

Hi Jan,

Am 15.08.22 um 12:34 schrieb Jan Kara:
> Hi Stefan,
> Back from vacation...
> On Sun 31-07-22 22:42:56, Stefan Wahren wrote:
>> Hi Jan,
>> Am 28.07.22 um 12:00 schrieb Jan Kara:
>>> Also can get filesystem metadata image of your card like:
>>>     e2image -r <fs-device> - | gzip >/tmp/ext4-image.gz
>>> and put it somewhere for download? The image will contain only fs metadata,
>>> not data so it should be relatively small and we won't have access to your
>>> secrets ;). With the image we'd be able to see how the free space looks
>>> like and whether it perhaps does not trigger some pathological behavior.
>> i've problems with this. If i try store uncompressed the metadata of the
>> second SD card partition (/dev/sdb2 = rootfs) the generated image file is
>> nearly big as the whole partition. In compressed state it's 25 MB. Is this
>> expected?
> Yes, that is expected. The resulting file is a sparse file that contains
> only metadata blocks that is the reason why it compresses so well but looks
> big.

i've added here:

> 								Honza

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