linux-kernel - Re: [Regression] ext4: changes to mb_optimize

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Message-ID: <76a9b920-0937-7bef-db55-844f0f5f6c1b@i2se.com>
Date:   Sun, 31 Jul 2022 22:42:56 +0200
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     Jan Kara <jack@...e.cz>
Cc:     linux-ext4@...r.kernel.org, Ojaswin Mujoo <ojaswin@...ux.ibm.com>,
        Harshad Shirwadkar <harshadshirwadkar@...il.com>,
        Theodore Ts'o <tytso@....edu>,
        Ritesh Harjani <riteshh@...ux.ibm.com>,
        linux-fsdevel@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Geetika.Moolchandani1@....com, regressions@...ts.linux.dev
Subject: Re: [Regression] ext4: changes to mb_optimize_scan cause issues on
 Raspberry Pi

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?