From: Heinz Mauelshagen Date: Wed, 15 Jun 2016 20:29:09 +0000 (+0200) Subject: dm raid: enhance comments in takeover checks X-Git-Tag: v4.8-rc1~160^2~32 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=6ee0bae9c847086b7025494e84a2fff0dfc83bdc;p=thirdparty%2Fkernel%2Flinux.git dm raid: enhance comments in takeover checks Signed-off-by: Heinz Mauelshagen Signed-off-by: Mike Snitzer --- diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c index 864e903cddda4..cc6eb7c27a7da 100644 --- a/drivers/md/dm-raid.c +++ b/drivers/md/dm-raid.c @@ -1610,7 +1610,7 @@ static int rs_check_takeover(struct raid_set *rs) mddev->raid_disks == 2) return 0; - /* raid5 with parity N -> raid6 with parity N */ + /* raid5_* -> raid6_*_6 with Q-Syndrome N (e.g. raid5_ra -> raid6_ra_6 */ if (mddev->new_level == 6 && ((mddev->layout == ALGORITHM_PARITY_N && mddev->new_layout == ALGORITHM_PARITY_N) || __within_range(mddev->new_layout, ALGORITHM_LEFT_ASYMMETRIC_6, ALGORITHM_RIGHT_SYMMETRIC_6))) @@ -1628,7 +1628,7 @@ static int rs_check_takeover(struct raid_set *rs) mddev->layout == ALGORITHM_PARITY_N) return 0; - /* raid6_*_n with parity N -> raid5_* */ + /* raid6_*_n with Q-Syndrome N -> raid5_* */ if (mddev->new_level == 5 && ((mddev->layout == ALGORITHM_PARITY_N && mddev->new_layout == ALGORITHM_PARITY_N) || __within_range(mddev->new_layout, ALGORITHM_LEFT_ASYMMETRIC, ALGORITHM_RIGHT_SYMMETRIC)))