linux-kernel - Re: [PATCH v3 03/10] ext4: warn if delalloc counters are not zero on inactive

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Message-ID: <20240512151038.wdg4g3evfvimr7ul@quack3>
Date: Sun, 12 May 2024 17:10:38 +0200
From: Jan Kara <jack@...e.cz>
To: Zhang Yi <yi.zhang@...weicloud.com>
Cc: linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, tytso@....edu,
	adilger.kernel@...ger.ca, jack@...e.cz, ritesh.list@...il.com,
	yi.zhang@...wei.com, chengzhihao1@...wei.com, yukuai3@...wei.com
Subject: Re: [PATCH v3 03/10] ext4: warn if delalloc counters are not zero on
 inactive

On Wed 08-05-24 14:12:13, Zhang Yi wrote:
> From: Zhang Yi <yi.zhang@...wei.com>
> 
> The per-inode i_reserved_data_blocks count the reserved delalloc blocks
> in a regular file, it should be zero when destroying the file. The
> per-fs s_dirtyclusters_counter count all reserved delalloc blocks in a
> filesystem, it also should be zero when umounting the filesystem. Now we
> have only an error message if the i_reserved_data_blocks is not zero,
> which is unable to be simply captured, so add WARN_ON_ONCE to make it
> more visable.
> 
> Signed-off-by: Zhang Yi <yi.zhang@...wei.com>

Well, maybe the warnings could be guarded by !(EXT4_SB(sb)->s_mount_state &
EXT4_ERROR_FS)? Because the warning isn't very interesting when the
filesystem was corrupted and if somebody runs with errors=continue we would
still possibly hit this warning although we don't really care...

								Honza

> ---
>  fs/ext4/super.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 044135796f2b..440dd54eea25 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -1343,6 +1343,9 @@ static void ext4_put_super(struct super_block *sb)
>  
>  	ext4_group_desc_free(sbi);
>  	ext4_flex_groups_free(sbi);
> +
> +	WARN_ON_ONCE(!ext4_forced_shutdown(sb) &&
> +		     percpu_counter_sum(&sbi->s_dirtyclusters_counter));
>  	ext4_percpu_param_destroy(sbi);
>  #ifdef CONFIG_QUOTA
>  	for (int i = 0; i < EXT4_MAXQUOTAS; i++)
> @@ -1473,7 +1476,8 @@ static void ext4_destroy_inode(struct inode *inode)
>  		dump_stack();
>  	}
>  
> -	if (EXT4_I(inode)->i_reserved_data_blocks)
> +	if (!ext4_forced_shutdown(inode->i_sb) &&
> +	    WARN_ON_ONCE(EXT4_I(inode)->i_reserved_data_blocks))
>  		ext4_msg(inode->i_sb, KERN_ERR,
>  			 "Inode %lu (%p): i_reserved_data_blocks (%u) not cleared!",
>  			 inode->i_ino, EXT4_I(inode),
> -- 
> 2.39.2
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR