linux-ext4 - Re: [PATCH V2] ext4: force ro mount if ext4_setup

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Message-Id: <97DEB011-4E1C-4D8C-8C36-44F7DF571E7E@dilger.ca>
Date:	Thu, 24 May 2012 11:30:24 -0600
From:	Andreas Dilger <adilger@...ger.ca>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH V2] ext4: force ro mount if ext4_setup_super() fails

On 2012-05-24, at 11:01 AM, Eric Sandeen wrote:
> If ext4_setup_super() fails i.e. due to a too-high revision,
> the error is logged in dmesg but the fs is not mounted RO as
> indicated.
> 
> Tested by:
> 
> # mkfs.ext4 -r 4 /dev/sdb6
> # mount /dev/sdb6 /mnt/test
> # dmesg | grep "too high"
> [164919.759248] EXT4-fs (sdb6): revision level too high, forcing read-only mode
> # grep sdb6 /proc/mounts
> /dev/sdb6 /mnt/test2 ext4 rw,seclabel,relatime,data=ordered 0 0
>                          ^^
> 
> Signed-off-by: Eric Sandeen <sandeen@...hat.com>

Reviewed-by: Andreas Dilger <adilger@...mcloud.com>

> ---
> 
> V2, fix subject C&P error, oops.
> 
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index e1fb1d5..be67c0b 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -3592,7 +3592,8 @@ no_journal:
> 		goto failed_mount4;
> 	}
> 
> -	ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
> +	if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
> +		sb->s_flags |= MS_RDONLY;
> 
> 	/* determine the minimum size of new large inodes, if present */
> 	if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
> 
> --
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> 
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Cheers, Andreas





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