linux-ext4 - Re: [PATCH 02/13] ext4: remove cantfind

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Date:   Wed, 31 Aug 2022 13:41:55 +0200
From:   Jan Kara <jack@...e.cz>
To:     Jason Yan <yanaijie@...wei.com>
Cc:     tytso@....edu, adilger.kernel@...ger.ca, jack@...e.cz,
        ritesh.list@...il.com, lczerner@...hat.com,
        linux-ext4@...r.kernel.org
Subject: Re: [PATCH 02/13] ext4: remove cantfind_ext4 error handler

On Tue 30-08-22 20:04:00, Jason Yan wrote:
> The 'cantfind_ext4' error handler is just a error msg print and then
> goto failed_mount. This two level goto makes the code complex and not
> easy to read. The only benefit is that is saves a little bit code.
> However some branches can merge and some branches dot not even need it.
> So do some refactor and remove it.
> 
> Signed-off-by: Jason Yan <yanaijie@...wei.com>

Yeah, probably makes sense. Just small style nits below. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

> @@ -4798,8 +4800,11 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
>  	sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
>  
>  	sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
> -	if (sbi->s_inodes_per_block == 0)
> -		goto cantfind_ext4;
> +	if (sbi->s_inodes_per_block == 0 || (EXT4_BLOCKS_PER_GROUP(sb) == 0)) {

I'd write this as:

	if (sbi->s_inodes_per_block == 0 || sbi->s_blocks_per_group == 0) {

to avoid superfluous braces and make the code a bit more natural.

									Honza

> +		if (!silent)
> +			ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
> +		goto failed_mount;
> +	}
>  	if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
>  	    sbi->s_inodes_per_group > blocksize * 8) {
>  		ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
> @@ -4896,9 +4901,6 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
>  		goto failed_mount;
>  	}
>  
> -	if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
> -		goto cantfind_ext4;
> -
>  	/* check blocks count against device size */
>  	blocks_count = sb_bdev_nr_blocks(sb);
>  	if (blocks_count && ext4_blocks_count(es) > blocks_count) {
> @@ -5408,11 +5410,6 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
>  
>  	return 0;
>  
> -cantfind_ext4:
> -	if (!silent)
> -		ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
> -	goto failed_mount;
> -
>  failed_mount9:
>  	ext4_release_orphan_info(sb);
>  failed_mount8:
> -- 
> 2.31.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR