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Date:   Wed, 23 Sep 2020 11:44:57 +0200
From:   Jan Kara <jack@suse.cz>
To:     Mikulas Patocka <mpatocka@redhat.com>
Cc:     Theodore Ts'o <tytso@mit.edu>,
        Andreas Dilger <adilger.kernel@dilger.ca>,
        linux-ext4@vger.kernel.org,
        Dan Williams <dan.j.williams@intel.com>,
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        Matthew Wilcox <willy@infradead.org>, Jan Kara <jack@suse.cz>,
        Eric Sandeen <esandeen@redhat.com>,
        Dave Chinner <david@fromorbit.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>
Subject: Re: A bug in ext4 with big directories (was: NVFS XFS metadata)
Message-ID: <20200923094457.GB6719@quack2.suse.cz>
References: <alpine.LRH.2.02.2009160649560.20720@file01.intranet.prod.int.rdu2.redhat.com>
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Hi!

On Wed 23-09-20 05:20:55, Mikulas Patocka wrote:
> There seems to be a bug in ext4 - when I create very large directory, ext4 
> fails with -ENOSPC despite the fact that there is plenty of free space and 
> free inodes on the filesystem.
> 
> How to reproduce:
> download the program dir-test: 
> http://people.redhat.com/~mpatocka/benchmarks/dir-test.c
> 
> # modprobe brd rd_size=67108864
> # mkfs.ext4 /dev/ram0
> # mount -t ext4 /dev/ram0 /mnt/test
> # dir-test /mnt/test/ 8000000 8000000
> deleting: 7999000
> 2540000
> file 2515327 can't be created: No space left on device
> # df /mnt/test
> /dev/ram0        65531436 633752 61525860   2% /mnt/test
> # df -i /mnt/test
> /dev/ram0        4194304 1881547 2312757   45% /mnt/test

Yeah, you likely run out of space in ext4 directory h-tree. You can enable
higher depth h-trees with large_dir feature (mkfs.ext4 -O large_dir). Does
that help?

								Honza

-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR