[dm-devel] [PATCH 1/1 V2] dm raid: fix compat_features validation
Heinz Mauelshagen
heinzm at redhat.com
Tue Oct 11 16:53:48 UTC 2016
Acked-by: Heinz Mauelshagen <heinzm at redhat.com>
On 10/11/2016 06:21 PM, Andy Whitcroft wrote:
> From a30fba068e41214cb0ffcb14e68722482765e0c9 Mon Sep 17 00:00:00 2001
> From: Andy Whitcroft <apw at canonical.com>
> Date: Tue, 11 Oct 2016 15:16:57 +0100
>
> In ecbfb9f118bce4 ("dm raid: add raid level takeover support") a new
> compatible feature flag was added. Validation for these compat_features
> was added but this only passes for new raid mappings with this feature
> flag. This causes previously created raid mappings to be failed at
> import.
Clarification:
to allow for feature checks, the compat_features member was
in the dm-raid superblock from the beginning (so before ecbfb9f118bce4).
It got renamed from features to compat_features because incompat_features
got introduced with that commit together with the problematic check
of compat_features you thankfully found.
>
> Check compat_features for the only valid combination.
>
> Fixes: ecbfb9f118bce4 ("dm raid: add raid level takeover support")
> Signed-off-by: Andy Whitcroft <apw at canonical.com>
> ---
> drivers/md/dm-raid.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> V2: simplify checks as per maintainer.
>
> diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
> index 8abde6b..2a39700 100644
> --- a/drivers/md/dm-raid.c
> +++ b/drivers/md/dm-raid.c
> @@ -2258,7 +2258,8 @@ static int super_validate(struct raid_set *rs, struct md_rdev *rdev)
> if (!mddev->events && super_init_validation(rs, rdev))
> return -EINVAL;
>
> - if (le32_to_cpu(sb->compat_features) != FEATURE_FLAG_SUPPORTS_V190) {
> + if (le32_to_cpu(sb->compat_features) &&
> + le32_to_cpu(sb->compat_features) != FEATURE_FLAG_SUPPORTS_V190) {
> rs->ti->error = "Unable to assemble array: Unknown flag(s) in compatible feature flags";
> return -EINVAL;
> }
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