[Ocfs2-devel] ocfs2: Check heartbeat mode for kernel stacks only

[Sunil Mushran]

Acked-by: Sunil Mushran <sunil.mushran at oracle.com>

On 01/31/2011 11:31 AM, Mark Fasheh wrote:
> Commit 2c442719e90a44a6982c033d69df4aae4b167cfa added some checks for proper
> heartbeat mode when the o2cb stack is running.  Unfortunately, it didn't
> take into account that a userpsace stack could be running. Fix this by only
> doing the check if o2cb is in use. This patch allows userspace stacks to
> mount the fs again.
>
> Cc: stable at kernel.org
> Signed-off-by: Mark Fasheh<mfasheh at suse.com>
>
> Index: linux-2.6.32-SLE11-SP1/fs/ocfs2/super.c
> ===================================================================
> --- linux-2.6.32-SLE11-SP1.orig/fs/ocfs2/super.c
> +++ linux-2.6.32-SLE11-SP1/fs/ocfs2/super.c
> @@ -1331,7 +1331,7 @@ static int ocfs2_parse_options(struct su
>   			       struct mount_options *mopt,
>   			       int is_remount)
>   {
> -	int status;
> +	int status, user_stack = 0;
>   	char *p;
>   	u32 tmp;
>
> @@ -1474,6 +1474,15 @@ static int ocfs2_parse_options(struct su
>   			memcpy(mopt->cluster_stack, args[0].from,
>   			       OCFS2_STACK_LABEL_LEN);
>   			mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
> +			/*
> +			 * Open code the memcmp here as we don't have
> +			 * an osb to pass to
> +			 * ocfs2_userspace_stack().
> +			 */
> +			if (memcmp(mopt->cluster_stack,
> +				   OCFS2_CLASSIC_CLUSTER_STACK,
> +				   OCFS2_STACK_LABEL_LEN))
> +				user_stack = 1;
>   			break;
>   		case Opt_inode64:
>   			mopt->mount_opt |= OCFS2_MOUNT_INODE64;
> @@ -1529,13 +1538,16 @@ static int ocfs2_parse_options(struct su
>   		}
>   	}
>
> -	/* Ensure only one heartbeat mode */
> -	tmp = mopt->mount_opt&  (OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL |
> -				 OCFS2_MOUNT_HB_NONE);
> -	if (hweight32(tmp) != 1) {
> -		mlog(ML_ERROR, "Invalid heartbeat mount options\n");
> -		status = 0;
> -		goto bail;
> +	if (user_stack == 0) {
> +		/* Ensure only one heartbeat mode */
> +		tmp = mopt->mount_opt&  (OCFS2_MOUNT_HB_LOCAL |
> +					 OCFS2_MOUNT_HB_GLOBAL |
> +					 OCFS2_MOUNT_HB_NONE);
> +		if (hweight32(tmp) != 1) {
> +			mlog(ML_ERROR, "Invalid heartbeat mount options\n");
> +			status = 0;
> +			goto bail;
> +		}
>   	}
>
>   	status = 1;