Test level changes and related reshaping.

Signed-off-by: NeilBrown <neilb@suse.de>

test

@@ -165,7 +165,9 @@ testdev() {
    cnt=$2
    dvsize=$3
    chunk=$4
-   mkfs -j $dev > /dev/null 2>&1 && fsck -fn $dev >&2
+   if [ -z "$5" ]; then
+      mkfs -j $dev > /dev/null 2>&1 && fsck -fn $dev >&2
+   fi
    dsize=$[dvsize/chunk]
    dsize=$[dsize*chunk]
    rasize=$[dsize*2*cnt]

tests/07changelevels

@@ -0,0 +1,51 @@
+
+# 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 0.5
+ check wait
+ testdev $md0 $1 $mdsize0 64 nd
+ 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
+}
+
+bu=/tmp/md-test-backup
+rm -f $bu
+mdadm -CR $md0 -l1 -n2 -x1 $dev0 $dev1 $dev2
+testdev $md0 1 $mdsize0 64
+dd if=/tmp/RandFile of=$md0
+dotest 1
+
+mdadm --grow $md0 -l5 -n3 --chunk 64
+dotest 2
+
+mdadm $md0 --add $dev3 $dev4
+mdadm --grow $md0 -n4 --chunk 32
+dotest 3
+
+mdadm -G $md0 -l6 --backup-file $bu
+dotest 3
+
+mdadm -G /dev/md0 --array-size $[mdsize0*2]
+mdadm -G $md0 -n4 --backup-file $bu
+dotest 2
+
+mdadm -G $md0 -l5 --backup-file $bu
+dotest 2
+
+mdadm -G /dev/md0 --array-size $mdsize0
+mdadm -G $md0 -n2 --backup-file $bu
+dotest 1
+
+mdadm -G --level=1 $md0
+dotest 1