linux-ext4 - Re: [PATCH 2/5] mke2fs: the -g option will now specify the clusters per block group

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Message-ID: <20130115152250.GB19209@gmail.com>
Date:	Tue, 15 Jan 2013 23:22:50 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	Theodore Ts'o <tytso@....edu>
Cc:	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 2/5] mke2fs: the -g option will now specify the clusters
 per block group

On Mon, Jan 14, 2013 at 07:37:09PM -0500, Theodore Ts'o wrote:
> If bigalloc is enabled, then -g will specify the clusters per block
> group.  (If bigalloc is not enabled, then a cluster == a block, so the
> meaning of -g is not changed.)
> 
> Signed-off-by: "Theodore Ts'o" <tytso@....edu>
Reviewed-by: Zheng Liu <wenqing.lz@...bao.com>
Regards,
                                                - Zheng
> ---
>  misc/mke2fs.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/misc/mke2fs.c b/misc/mke2fs.c
> index 75d0e48..5cb49b3 100644
> --- a/misc/mke2fs.c
> +++ b/misc/mke2fs.c
> @@ -1962,6 +1962,15 @@ profile_error:
>  		}
>  	}
>  
> +	/*
> +	 * If the bigalloc feature is enabled, then the -g option will
> +	 * specify the number of clusters per group.
> +	 */
> +	if (fs_param.s_feature_ro_compat & EXT4_FEATURE_RO_COMPAT_BIGALLOC) {
> +		fs_param.s_clusters_per_group = fs_param.s_blocks_per_group;
> +		fs_param.s_blocks_per_group = 0;
> +	}
> +
>  	if (inode_size == 0)
>  		inode_size = get_int_from_profile(fs_types, "inode_size", 0);
>  	if (!flex_bg_size && (fs_param.s_feature_incompat &
> -- 
> 1.7.12.rc0.22.gcdd159b
> 
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