#
# test that we can stop and restart a level change.
# just test a few in-place changes, and a few
# size-reducing changes.


checkgeo() {
 # check the geometry of an array
 # level raid_disks chunk_size layout
 dev=$1
 shift
 sleep 0.5
 check wait
 sleep 1
 for attr in level raid_disks chunk_size layout
 do
   if [ $# -gt 0 ] ; then
      val=$1
      shift
      if [ " `cat /sys/block/$dev/md/$attr`" != " $val" ]
      then echo "$attr doesn't match for $dev"
           exit 1
      fi
   fi
 done
}

restart() {
 check reshape
 mdadm -S $md0
 mdadm -A $md0 $devs --backup-file=$bu
 check reshape
}

bu=/tmp/md-backup
rm -f $bu
devs="$dev0 $dev1 $dev2 $dev3 $dev4"
mdadm -CR $md0 -l5 -n5 -c 256 $devs
checkgeo md0 raid5 5 $[256*1024] 2

mdadm -G $md0 -c 128 --backup-file=$bu
restart
checkgeo md0 raid5 5 $[128*1024] 2

mdadm -G $md0 --layout rs --backup-file=$bu
restart
checkgeo md0 raid5 5 $[128*1024] 3

# It needs to shrink array size first. Choose a value that
# is power of 2 for array size. If not, it can't change
# chunk size.
mdadm -G $md0 --array-size 51200
mdadm -G $md0 --raid-disks 4 -c 64 --backup-file=$bu
restart
checkgeo md0 raid5 4 $[64*1024] 3

devs="$dev0 $dev1 $dev2 $dev3"
mdadm -G $md0 --array-size 18432
mdadm -G $md0 -n 2 -c 256 --backup-file=$bu
restart
checkgeo md0 raid5 2 $[256*1024] 3