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

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Message-ID: <7d8e3e67-a246-2bfd-39ad-663d7d9d8eed@huaweicloud.com>
Date: Mon, 13 May 2024 22:17:37 +0800
From: Zhang Yi <yi.zhang@...weicloud.com>
To: Jan Kara <jack@...e.cz>
Cc: linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
 linux-kernel@...r.kernel.org, tytso@....edu, adilger.kernel@...ger.ca,
 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 2024/5/12 23:10, Jan Kara wrote:
> 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...
> 

Make sense, I missed the errors=continue mode.

Thanks,
Yi.

> 
>> ---
>>  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
>>