linux-ext4 - Re: bug with large

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Message-Id: <5FE9762B-6C6B-4A44-AC99-22192B76C060@gmail.com>
Date:   Thu, 29 Jul 2021 22:23:35 +0300
From:   Благодаренко Артём 
        <artem.blagodarenko@...il.com>
To:     Carlos Carvalho <carlos@...ica.ufpr.br>
Cc:     linux-ext4@...r.kernel.org, Theodore Tso <tytso@...gle.com>,
        Andreas Dilger <adilger@...ger.ca>
Subject: Re: bug with large_dir in 5.12.17

Hello,

It looks like the fix b5776e7524afbd4569978ff790864755c438bba7 "ext4: fix potential htree index checksum corruption” introduced this regression.
I reverted it and my test from previous message passed the dangerous level of 1570000 names count.
Now test is still in progress. 2520000 names are already created.

I am searching the way to fix this.

Best regards,
Artem Blagodarenko.

> On 22 Jul 2021, at 17:23, Carlos Carvalho <carlos@...ica.ufpr.br> wrote:
> 
> There is a bug when enabling large_dir in 5.12.17. I got this during a backup:
> 
> index full, reach max htree level :2
> Large directory feature is not enabled on this filesystem
> 
> So I unmounted, ran tune2fs -O large_dir /dev/device and mounted again. However
> this error appeared:
> 
> dx_probe:864: inode #576594294: block 144245: comm rsync: directory leaf block found instead of index block
> 
> I unmounted, ran fsck and it "salvaged" a bunch of directories. However at the
> next backup run the same errors appeared again.
> 
> This is with vanilla 5.2.17.