set -e -x

# revert a reshape that is not changing the number of data devices,
# raid5, raid6, and raid10

# RAID5 -> RAID6
mdadm -CR --assume-clean $md0 -l5 -n4 -x1 $devlist4
check raid5
testdev $md0 3 $mdsize1 512
mdadm -G $md0 -l 6
sleep 2
mdadm -S $md0
mdadm -A $md0 --update=revert-reshape $devlist4 --backup-file=/tmp/md-backup
check wait
check raid6
check algorithm 18
testdev $md0 3 $mdsize1 512
mdadm -S $md0

# RAID6 -> RAID5
mdadm -CR --assume-clean $md0 -l6 -n5 $devlist4
check raid6
testdev $md0 3 $mdsize1 512
mdadm -G $md0 -l 5
sleep 2
mdadm -S $md0
mdadm -A $md0 --update=revert-reshape $devlist4 --backup-file=/tmp/md-backup
check wait
check raid6
testdev $md0 3 $mdsize1 512
mdadm -S $md0

# RAID10 - decrease chunk size
mdadm -CR --assume-clean $md0 -l10 -n6 -c 64 $devlist5
check raid10
testdev $md0 3 $mdsize1 64
mdadm -G $md0 -c 32
sleep 2
mdadm -S $md0
strace -o /tmp/str ./mdadm -A $md0 --update=revert-reshape $devlist5
check wait
check raid10
testdev $md0 3 $mdsize1 64
mdadm -S $md0