# Test changing of level, chunksize etc.
# Create a RAID1, convert to RAID5, add a disk, add another disk
# convert to RAID6, back to RAID5 and ultimately to RAID1

testK=$[64*3*6]
dd if=/dev/urandom of=/tmp/RandFile bs=1024 count=$testK
export MDADM_GROW_VERIFY=1

dotest() {
 sleep 2
 check wait
 blockdev --flushbufs $md0
 cmp -s -n $[textK*1024] $md0 /tmp/RandFile || { echo cmp failed; exit 2; }
 # write something new - shift chars 4 space
 tr ' -~' '$-~ -#' < /tmp/RandFile > /tmp/RandFile2
 mv /tmp/RandFile2 /tmp/RandFile
 dd if=/tmp/RandFile of=$md0
}

checkgeo() {
 # check the geometry of an array
 # level raid_disks chunk_size layout
 dev=$1
 shift
 sleep 15
 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
}


bu=/tmp/md-test-backup
rm -f $bu
mdadm -CR $md0 -l1 -n2 -x1 $dev0 $dev1 $dev2
[ -b $md0 ] || die "$1 isn't a block device."
dd if=/tmp/RandFile of=$md0
dotest 1

mdadm --grow $md0 -l5 -n3
checkgeo md0 raid5 3
dotest 2

mdadm $md0 --add $dev3 $dev4
mdadm --grow $md0 -n4 --chunk 32
checkgeo md0 raid5 4 $[32*1024]
dotest 3

mdadm -G $md0 -l6 --backup-file $bu
checkgeo md0 raid6 5 $[32*1024]
dotest 3

mdadm -G /dev/md0 --array-size 37888
mdadm -G $md0 -n4 --backup-file $bu
checkgeo md0 raid6 4 $[32*1024]
dotest 2

mdadm -G $md0 -l5 --backup-file $bu
checkgeo md0 raid5 3 $[32*1024]
dotest 2

mdadm -G /dev/md0 --array-size 18944
mdadm -G $md0 -n2 --backup-file $bu
checkgeo md0 raid5 2 $[32*1024]
dotest 1

# now repeat that last few steps only with a degraded array.
mdadm -S $md0
mdadm -CR $md0 -l6 -n5 $dev0 $dev1 $dev2 $dev3 $dev4
dd if=/tmp/RandFile of=$md0
dotest 3

mdadm $md0 --fail $dev0

mdadm -G /dev/md0 --array-size 35840
mdadm -G $md0 -n4 --backup-file $bu
dotest 2
checkgeo md0 raid6 4 $[512*1024]
mdadm $md0 --fail $dev4

mdadm $md0 --fail $dev3
# now double-degraded.
# switch layout to a DDF layout and back to make sure that works.

mdadm -G /dev/md0 --layout=ddf-N-continue --backup-file $bu
checkgeo md0 raid6 4 $[512*1024] 10
dotest 2
mdadm -G /dev/md0 --layout=ra --backup-file $bu
checkgeo md0 raid6 4 $[512*1024] 1
dotest 2

mdadm -G $md0 -l5 --backup-file $bu
dotest 2

mdadm -G /dev/md0 --array-size 17920
mdadm -G $md0 -n2 --backup-file $bu
dotest 1
checkgeo md0 raid5 2 $[512*1024]
mdadm $md0 --fail $dev2

mdadm -S $md0