linux-ext4 - Re: Initial results of FLEX

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Message-ID: <20070716063457.GA5992@schatzie.adilger.int>
Date:	Mon, 16 Jul 2007 00:34:57 -0600
From:	Andreas Dilger <adilger@...sterfs.com>
To:	"Jose R. Santos" <jrs@...ibm.com>
Cc:	Theodore Tso <tytso@....edu>,
	linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: Initial results of FLEX_BG feature.

On Jul 12, 2007  10:09 -0500, Jose R. Santos wrote:
> @@ -1271,6 +1271,9 @@ static int ext4_check_descriptors (struc
>  
>  	ext4_debug ("Checking group descriptors");
>  
> +	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
> +		return 1;
> +
>  	for (i = 0; i < sbi->s_groups_count; i++)
>  	{
>  		if (i == sbi->s_groups_count - 1)

It looks pretty straight forward to just change this code to leave
first_block at s_first_data_block, and leave last_block at ext4_blocks_count()
if FLEX_BG is set.

Even with FLEX_BG we want to keep the group metadata within the bounds of
the filesystem.

Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

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