linux-ext4 - Re: [PATCH 04/10] ext2fs: Don't create filesystems with meta_bg and resize

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Date:   Sun, 3 Jun 2018 22:27:51 -0600
From:   Andreas Dilger <adilger@...ger.ca>
To:     Jan Kara <jack@...e.cz>
Cc:     Ted Tso <tytso@....edu>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 04/10] ext2fs: Don't create filesystems with meta_bg and
 resize_inode

On May 30, 2018, at 6:51 AM, Jan Kara <jack@...e.cz> wrote:
> 
> ext2fs_initialize() may end up enabling meta_bg feature for filesystem
> which have resize_inode. Such combination is invalid to make sure we
> disable resize_inode when enabling meta_bg.
> 
> Signed-off-by: Jan Kara <jack@...e.cz>

Reviewed-by: Andreas Dilger <adilger@...ger.ca>

> ---
> lib/ext2fs/initialize.c | 12 +++++++-----
> 1 file changed, 7 insertions(+), 5 deletions(-)
> 
> diff --git a/lib/ext2fs/initialize.c b/lib/ext2fs/initialize.c
> index e1eff22eac33..8c9e97fee831 100644
> --- a/lib/ext2fs/initialize.c
> +++ b/lib/ext2fs/initialize.c
> @@ -382,6 +382,13 @@ ipg_retry:
> 		retval = EXT2_ET_RES_GDT_BLOCKS;
> 		goto cleanup;
> 	}
> +	/* Enable meta_bg if we'd lose more than 3/4 of a BG to GDT blocks. */
> +	if (super->s_reserved_gdt_blocks + fs->desc_blocks >
> +	    super->s_blocks_per_group * 3 / 4) {
> +		ext2fs_set_feature_meta_bg(fs->super);
> +		ext2fs_clear_feature_resize_inode(fs->super);
> +		set_field(s_reserved_gdt_blocks, 0);
> +	}
> 
> 	/*
> 	 * Calculate the maximum number of bookkeeping blocks per
> @@ -392,11 +399,6 @@ ipg_retry:
> 	overhead = (int) (3 + fs->inode_blocks_per_group +
> 			  super->s_reserved_gdt_blocks);
> 
> -	/* Enable meta_bg if we'd lose more than 3/4 of a BG to GDT blocks. */
> -	if (super->s_reserved_gdt_blocks + fs->desc_blocks >
> -	    super->s_blocks_per_group * 3 / 4)
> -		ext2fs_set_feature_meta_bg(fs->super);
> -
> 	if (ext2fs_has_feature_meta_bg(fs->super))
> 		overhead++;
> 	else
> --
> 2.13.6
> 


Cheers, Andreas






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