Adding upstream version 4.2.

Signed-off-by: Daniel Baumann <daniel@debian.org>

tests/10ddf-fail-two-spares

@@ -0,0 +1,86 @@
+# Simulate two disks failing shorty after each other
+. tests/env-ddf-template
+sda=$(get_rootdev) || exit 1
+tmp=$(mktemp /tmp/mdtest-XXXXXX)
+
+mdadm --zero-superblock $dev8 $dev9 $dev10 $dev11 $dev12 $dev13
+mdadm -CR $container -e ddf -l container -n 6 \
+      $dev8 $dev9 $dev10 $dev11 $dev12 $dev13
+
+#fast_sync
+
+mdadm -CR $member0 -l raid6 -n 4 $dev10 $dev11 $dev12 $dev13 -z 16384
+#$dir/mdadm -CR $member0 -l raid6 -n 4 $dev10 $dev11 $dev12 $dev13  -z 16384 \
+#	    >/tmp/mdmon.txt 2>&1
+mdadm -CR $member1 -l raid10 -n 4 $dev10 $dev11 $dev12 $dev13 -z 16384
+
+dd if=$sda of=$member0 bs=1M count=32
+dd if=$sda of=$member1 bs=1M skip=16 count=16
+
+check wait
+
+sum0=$(sha1sum $member0)
+sum1=$(sha1sum $member1)
+
+mdadm --fail $member1 $dev11
+sleep 1
+mdadm --fail $member1 $dev12
+
+# We will have 4 resync procedures, 2 spares for 2 arrays.
+mdadm --wait $member1 $member0 || true
+mdadm --wait $member1 $member0 || true
+
+devs0="$(get_raiddisks $member0)"
+devs1="$(get_raiddisks $member1)"
+expected="$dev10
+$dev13
+$dev8
+$dev9"
+
+ret=0
+if [ "$(echo "$devs0" | sort)" != "$expected" \
+   -o "$(echo "$devs1" | sort)" != "$expected" ]; then
+    echo ERROR: unexpected members
+    echo $member0: $devs0
+    echo $member1: $devs1
+    ret=1
+fi
+
+mdadm -E $dev10 >$tmp
+if ! grep -q 'state\[0\] : Optimal, Consistent' $tmp; then
+    echo ERROR: $member0 should be optimal in meta data
+    ret=1
+fi
+if ! grep -q 'state\[1\] : Optimal, Consistent' $tmp; then
+    echo ERROR: $member1 should be optimal in meta data
+    ret=1
+fi
+if [ x"$(grep -c active/Online $tmp)" != x4 ]; then
+    echo ERROR: expected 4 online disks
+    ret=1
+fi
+if [ x"$(grep -c "Offline, Failed" $tmp)" != x2 ]; then
+    echo ERROR: expected 2 failed disks
+    ret=1
+fi
+
+sum0a=$(sha1sum $member0)
+sum1a=$(sha1sum $member1)
+
+if [ "$sum0" != "$sum0a" -o "$sum1" != "$sum1a" ]; then
+   echo ERROR: checksum mismatch
+   ret=1
+fi
+
+if [ $ret -eq 1 ]; then
+    cat /proc/mdstat
+    cat $tmp
+fi
+
+[ -f /tmp/mdmon.txt ] && {
+  cat /tmp/mdmon.txt
+  rm -f /tmp/mdmon.txt
+}
+rm -f $tmp
+
+[ $ret -eq 0 ]