linux-ext4 - Re: Inode 2885482 (000000008e814f64): i_reserved_data

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Date:   Fri, 15 Oct 2021 02:06:52 +0800
From:   Gao Xiang <hsiangkao@...ux.alibaba.com>
To:     "Rantala, Tommi T. (Nokia - FI/Espoo)" <tommi.t.rantala@...ia.com>
Cc:     "jefflexu@...ux.alibaba.com" <jefflexu@...ux.alibaba.com>,
        "enwlinux@...il.com" <enwlinux@...il.com>,
        "tytso@....edu" <tytso@....edu>,
        "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Inode 2885482 (000000008e814f64): i_reserved_data_blocks (2) not
 cleared!

On Thu, Oct 14, 2021 at 12:54:14PM +0000, Rantala, Tommi T. (Nokia - FI/Espoo) wrote:
> Hi,
> 
> I'm seeing these i_reserved_data_blocks not cleared! messages when using ext4
> with nodelalloc, message added in:
> 
>   commit 6fed83957f21eff11c8496e9f24253b03d2bc1dc
>   Author: Jeffle Xu <jefflexu@...ux.alibaba.com>
>   Date:   Mon Aug 23 14:13:58 2021 +0800
> 
>       ext4: fix reserved space counter leakage
> 
> I can quickly reproduce in 5.15.0-rc5-00041-g348949d9a444 by doing some
> filesystem I/O while toggling delalloc:
> 
> 
> while true; do mount -o remount,nodelalloc /; sleep 1; mount -o remount,delalloc /; sleep 1; done &
> git clone linux xxx; rm -rf xxx

If I understand correctly, switching such option implies
sync inodes to write back exist delayed allocation blocks.

At a glance I don't find it. Yet no test actually.

Thanks,
Gao Xiang

> 
> [  222.928341] EXT4-fs (vdb1): re-mounted. Opts: delalloc. Quota mode: disabled.
> [  223.932516] EXT4-fs (vdb1): re-mounted. Opts: nodelalloc. Quota mode: disabled.
> [  224.183741] EXT4-fs (vdb1): Inode 2885482 (000000008e814f64): i_reserved_data_blocks (2) not cleared!
> [  224.185064] EXT4-fs (vdb1): Inode 2885478 (00000000862b48ad): i_reserved_data_blocks (2) not cleared!
> [  224.186434] EXT4-fs (vdb1): Inode 2885474 (00000000a20bdd95): i_reserved_data_blocks (7) not cleared!
> [  224.187649] EXT4-fs (vdb1): Inode 2885476 (00000000028005e1): i_reserved_data_blocks (2) not cleared!
> [  224.189016] EXT4-fs (vdb1): Inode 2885475 (0000000025d9617d): i_reserved_data_blocks (2) not cleared!
> [  224.190370] EXT4-fs (vdb1): Inode 2885480 (00000000d0722d90): i_reserved_data_blocks (7) not cleared!
> [  224.191732] EXT4-fs (vdb1): Inode 2885481 (000000009b50d6cb): i_reserved_data_blocks (1) not cleared!
> [  224.193093] EXT4-fs (vdb1): Inode 2885472 (00000000fe907f54): i_reserved_data_blocks (1) not cleared!
> [  227.946984] EXT4-fs: 9213 callbacks suppressed
> [  227.946989] EXT4-fs (vdb1): re-mounted. Opts: nodelalloc. Quota mode: disabled.
> 
> 
> -Tommi
>