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Date:	Mon, 4 Jun 2007 17:32:23 -0600
From:	Andreas Dilger <adilger@...sterfs.com>
To:	Mingming Cao <cmm@...ibm.com>
Cc:	"Jose R. Santos" <jrs@...ibm.com>,
	linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [RFC][PATCH] Set JBD2_FEATURE_INCOMPAT_64BIT on filesystems larger than 32-bit blocks (take 2).

On Jun 04, 2007  16:01 -0700, Mingming Cao wrote:
> Set the journals JBD2_FEATURE_INCOMPAT_64BIT on devices with more
> than 32bit block sizes during mount time.  This ensure proper record
> lenth when writing to the journal.
> 
> Signed-off-by: Mingming Cao <cmm@...ibm.com>
> Signed-off-by: Jose R. Santos <jrs@...ibm.com>

You can add Signed-off-by: Andreas Dilger <adilger@...sterfs.com> also.

> Index: linux-2.6.22-rc3/fs/ext4/super.c
> ===================================================================
> --- linux-2.6.22-rc3.orig/fs/ext4/super.c	2007-06-04 11:01:20.028360650 -0500
> +++ linux-2.6.22-rc3/fs/ext4/super.c	2007-06-04 11:05:11.389126418 -0500
> @@ -1824,6 +1824,17 @@ static int ext4_fill_super (struct super
>  		goto failed_mount3;
>  	}
> 
> +        /*
> +	 * Make sure to set JBD2_FEATURE_INCOMPAT_64BIT on filesystems
> +	 * with more that 32-bit block counts
> +	 */
> +	if (le32_to_cpu(es->s_blocks_count_hi) &&
> +	   !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
> +				      JBD2_FEATURE_INCOMPAT_64BIT)){
> +		printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
> +		goto failed_mount4;
> +	}
> +
>  	/* We have now updated the journal if required, so we can
>  	 * validate the data journaling mode. */
>  	switch (test_opt(sb, DATA_FLAGS)) {

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

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