linux-ext4 - Re: [PATCH 04/13] ext4: factor out ext4_handle

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Date:   Wed, 31 Aug 2022 13:46:53 +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 04/13] ext4: factor out ext4_handle_clustersize()

On Tue 30-08-22 20:04:02, Jason Yan wrote:
> Factor out ext4_handle_clustersize(). No functional change.
> 
> Signed-off-by: Jason Yan <yanaijie@...wei.com>

Looks good. Feel free to add:

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

								Honza

> 
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 66a128e5a9c8..1855559be4f2 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -4366,6 +4366,64 @@ static void ext4_set_def_opts(struct super_block *sb,
>  		set_opt(sb, DELALLOC);
>  }
>  
> +static int ext4_handle_clustersize(struct super_block *sb, int blocksize)
> +{
> +	struct ext4_sb_info *sbi = EXT4_SB(sb);
> +	struct ext4_super_block *es = sbi->s_es;
> +	int clustersize;
> +
> +	/* Handle clustersize */
> +	clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
> +	if (ext4_has_feature_bigalloc(sb)) {
> +		if (clustersize < blocksize) {
> +			ext4_msg(sb, KERN_ERR,
> +				 "cluster size (%d) smaller than "
> +				 "block size (%d)", clustersize, blocksize);
> +			return -EINVAL;
> +		}
> +		sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
> +			le32_to_cpu(es->s_log_block_size);
> +		sbi->s_clusters_per_group =
> +			le32_to_cpu(es->s_clusters_per_group);
> +		if (sbi->s_clusters_per_group > blocksize * 8) {
> +			ext4_msg(sb, KERN_ERR,
> +				 "#clusters per group too big: %lu",
> +				 sbi->s_clusters_per_group);
> +			return -EINVAL;
> +		}
> +		if (sbi->s_blocks_per_group !=
> +		    (sbi->s_clusters_per_group * (clustersize / blocksize))) {
> +			ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
> +				 "clusters per group (%lu) inconsistent",
> +				 sbi->s_blocks_per_group,
> +				 sbi->s_clusters_per_group);
> +			return -EINVAL;
> +		}
> +	} else {
> +		if (clustersize != blocksize) {
> +			ext4_msg(sb, KERN_ERR,
> +				 "fragment/cluster size (%d) != "
> +				 "block size (%d)", clustersize, blocksize);
> +			return -EINVAL;
> +		}
> +		if (sbi->s_blocks_per_group > blocksize * 8) {
> +			ext4_msg(sb, KERN_ERR,
> +				 "#blocks per group too big: %lu",
> +				 sbi->s_blocks_per_group);
> +			return -EINVAL;
> +		}
> +		sbi->s_clusters_per_group = sbi->s_blocks_per_group;
> +		sbi->s_cluster_bits = 0;
> +	}
> +	sbi->s_cluster_ratio = clustersize / blocksize;
> +
> +	/* Do we have standard group size of clustersize * 8 blocks ? */
> +	if (sbi->s_blocks_per_group == clustersize << 3)
> +		set_opt2(sb, STD_GROUP_SIZE);
> +
> +	return 0;
> +}
> +
>  static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
>  {
>  	struct buffer_head *bh, **group_desc;
> @@ -4377,7 +4435,7 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
>  	unsigned long offset = 0;
>  	struct inode *root;
>  	int ret = -ENOMEM;
> -	int blocksize, clustersize;
> +	int blocksize;
>  	unsigned int db_count;
>  	unsigned int i;
>  	int needs_recovery, has_huge_files;
> @@ -4847,54 +4905,8 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
>  		}
>  	}
>  
> -	/* Handle clustersize */
> -	clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
> -	if (ext4_has_feature_bigalloc(sb)) {
> -		if (clustersize < blocksize) {
> -			ext4_msg(sb, KERN_ERR,
> -				 "cluster size (%d) smaller than "
> -				 "block size (%d)", clustersize, blocksize);
> -			goto failed_mount;
> -		}
> -		sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
> -			le32_to_cpu(es->s_log_block_size);
> -		sbi->s_clusters_per_group =
> -			le32_to_cpu(es->s_clusters_per_group);
> -		if (sbi->s_clusters_per_group > blocksize * 8) {
> -			ext4_msg(sb, KERN_ERR,
> -				 "#clusters per group too big: %lu",
> -				 sbi->s_clusters_per_group);
> -			goto failed_mount;
> -		}
> -		if (sbi->s_blocks_per_group !=
> -		    (sbi->s_clusters_per_group * (clustersize / blocksize))) {
> -			ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
> -				 "clusters per group (%lu) inconsistent",
> -				 sbi->s_blocks_per_group,
> -				 sbi->s_clusters_per_group);
> -			goto failed_mount;
> -		}
> -	} else {
> -		if (clustersize != blocksize) {
> -			ext4_msg(sb, KERN_ERR,
> -				 "fragment/cluster size (%d) != "
> -				 "block size (%d)", clustersize, blocksize);
> -			goto failed_mount;
> -		}
> -		if (sbi->s_blocks_per_group > blocksize * 8) {
> -			ext4_msg(sb, KERN_ERR,
> -				 "#blocks per group too big: %lu",
> -				 sbi->s_blocks_per_group);
> -			goto failed_mount;
> -		}
> -		sbi->s_clusters_per_group = sbi->s_blocks_per_group;
> -		sbi->s_cluster_bits = 0;
> -	}
> -	sbi->s_cluster_ratio = clustersize / blocksize;
> -
> -	/* Do we have standard group size of clustersize * 8 blocks ? */
> -	if (sbi->s_blocks_per_group == clustersize << 3)
> -		set_opt2(sb, STD_GROUP_SIZE);
> +	if (ext4_handle_clustersize(sb, blocksize))
> +		goto failed_mount;
>  
>  	/*
>  	 * Test whether we have more sectors than will fit in sector_t,
> -- 
> 2.31.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR