linux-ext4 - Re: [PATCH v2 1/8] ext4: use ASSERT() to replace J

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Date:   Tue, 20 Oct 2020 13:03:41 +0800
From:   brookxu <brookxu.cn@...il.com>
To:     Andreas Dilger <adilger@...ger.ca>
Cc:     Ted Tso <tytso@....edu>,
        Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH v2 1/8] ext4: use ASSERT() to replace J_ASSERT()

Thanks for your reply.

Andreas Dilger wrote on 2020/10/20 11:37:
> On Oct 19, 2020, at 3:02 AM, Chunguang Xu <brookxu.cn@...il.com> wrote:
>>
>> There are currently multiple forms of assertion, such as J_ASSERT().
>> J_ASEERT is provided for the jbd module, which is a public module.
> 
> (typo) "J_ASSERT()"
Thanks, I  will Fixed that.

>> Maybe we should use custom ASSERT() like other file systems, such as
>> xfs, which would be better.
> 
> My one minor complaint is that "ASSERT()" is a very generic name and is
> likely to cause conflicts with ASSERT in other headers.  That said, I
> also see many other filesystems using their own ASSERT() macro, so I
> guess they are all in private headers only?
I also thought about this before, but even if we define it in a private
header file, because we still include several header files in a certain
file, it seems that the conflict cannot be resolved. However, maybe it
is safest to use a name with ext4 prefix. I will try to fix it in next
version. Thanks.

> Some minor comments/questions below, but not worth changing the patch
> unless you think they are important...
> 
> You can add:
> 
> Reviewed-by: Andreas Dilger <adilger@...ger.ca>
> 
>> @@ -185,7 +185,7 @@ static int ext4_init_block_bitmap(struct super_block *sb,
>> 	struct ext4_sb_info *sbi = EXT4_SB(sb);
>> 	ext4_fsblk_t start, tmp;
>>
>> -	J_ASSERT_BH(bh, buffer_locked(bh));
>> +	ASSERT(buffer_locked(bh));
> 
> I thought J_ASSERT_BH() did something useful, but J_ASSERT_BH() just maps
> to J_ASSERT() internally anyway.
> 
>> +#define ASSERT(assert)							\
>> +do {									\
>> +	if (unlikely(!(assert))) {					\
>> +		printk(KERN_EMERG					\
>> +		       "Assertion failure in %s() at %s:%d: \"%s\"\n",	\
> 
> (style) better to use single quotes '%s' to avoid the need to escape \".
Thanks, this is a good suggestion, I will fix it next version.

> Cheers, Andreas
> 
> 
> 
> 
>