linux-kernel - Re: [PATCH] btrfs: fix disk-io.c/btrfs_read_dev_super with BTRFS_SUPER_MIRROR

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Message-ID: <20120910161454.GA2270@localhost.localdomain>
Date:	Mon, 10 Sep 2012 12:14:54 -0400
From:	Josef Bacik <jbacik@...ionio.com>
To:	Wang Sheng-Hui <shhuiw@...il.com>
CC:	"Chris L. Mason" <clmason@...ionio.com>,
	"linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] btrfs: fix disk-io.c/btrfs_read_dev_super with
 BTRFS_SUPER_MIRROR_MAX to control the loops

On Mon, Sep 10, 2012 at 12:38:35AM -0600, Wang Sheng-Hui wrote:
> To check the duplicated super blocks, use BTRFS_SUPER_MIRROR_MAX
> as the loops limit.
> 
> Signed-off-by: Wang Sheng-Hui <shhuiw@...il.com>
> ---
>  fs/btrfs/disk-io.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
> index 22e98e0..a431144 100644
> --- a/fs/btrfs/disk-io.c
> +++ b/fs/btrfs/disk-io.c
> @@ -2723,7 +2723,7 @@ struct buffer_head *btrfs_read_dev_super(struct block_device *bdev)
>  	 * So, we need to add a special mount option to scan for
>  	 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
>  	 */
> -	for (i = 0; i < 1; i++) {
> +	for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
>  		bytenr = btrfs_sb_offset(i);
>  		if (bytenr + 4096 >= i_size_read(bdev->bd_inode))
>  			break;

We don't want to do this, it should be left for -o recovery or some such mount
option.  Thanks,

Josef
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