[dm-devel] [PATCH v2 1/2] md raid0/linear: Introduce new array state 'broken'

[Guoqing Jiang]

Hi,

On 8/16/19 3:40 PM, Guilherme G. Piccoli wrote:
> +static bool linear_is_missing_dev(struct mddev *mddev)
> +{
> +	struct md_rdev *rdev;
> +	static int already_missing;
> +	int def_disks, work_disks = 0;
> +
> +	def_disks = mddev->raid_disks;
> +	rdev_for_each(rdev, mddev)
> +		if (rdev->bdev->bd_disk->flags & GENHD_FL_UP)
> +			work_disks++;
> +
> +	if (unlikely(def_disks - work_disks)) {

If my understanding is correct, after enter the branch,

> +		if (already_missing < (def_disks - work_disks)) {

the above is always true since already_missing should be '0', right?
If so, maybe the above checking is pointless.

> +			already_missing = def_disks - work_disks;
> +			pr_warn("md: %s: linear array has %d missing/failed members\n",
> +				mdname(mddev), already_missing);
> +		}
> +		return true;
> +	}
> +
> +	already_missing = 0;
> +	return false;
> +}
> +.

I'd suggest something like, just FYI.

bool already_missing = false;
int missing_disks;

missing_disks = def_disks - work_disks;
if (unlikely(missing_disks)) {
	already_missing = true;
	pr_warn("md: %s: linear array has %d missing/failed members\n", mdname(mddev), missing_disks);
}
return already_missing;


Thanks,
Guoqing