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dm raid: enhance comments in takeover checks 

Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Heinz Mauelshagen 2016-06-15 22:29:09 +02:00 committed by Mike Snitzer
parent ae3c6cfff9
commit 6ee0bae9c8
1 changed files with 2 additions and 2 deletions
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4
drivers/md/dm-raid.c
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@ -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)))