Adding upstream version 4.2.

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

tests/10ddf-fail-spare

@@ -0,0 +1,86 @@
+# Test suggested by Albert Pauw: Create, fail one disk, have mdmon
+# activate the spare,
+# then run create again. Shouldn't use the failed disk for Create,
+. tests/env-ddf-template
+
+tmp=$(mktemp /tmp/mdtest-XXXXXX)
+rm -f $tmp
+
+mdadm --zero-superblock $dev8 $dev9 $dev10 $dev11 $dev12 $dev13
+mdadm -CR $container -e ddf -l container -n 5 $dev8 $dev9 $dev10 $dev11 $dev12
+
+mdadm -CR $member0 -l raid1 -n 2 $container
+#$dir/mdadm -CR $member0 -l raid1 -n 2 $container >/tmp/mdmon.txt 2>&1
+
+check wait
+
+set -- $(get_raiddisks $member0)
+fail0=$1
+mdadm --fail $member0 $fail0
+
+# To make sure the spare is activated, we may have to sleep
+# 2s has always been enough for me
+sleep 2
+check wait
+
+# This test can succeed both ways - if spare was activated
+# before new array was created, we see only member 0.
+# otherwise, we see both, adn member0 is degraded because the
+# new array grabbed the spare
+# which case occurs depends on the sleep time above.
+ret=0
+if mdadm -CR $member1 -l raid5 -n 3 $container; then
+   # Creation successful - must have been quicker than spare activation
+
+   check wait
+   set -- $(get_raiddisks $member1)
+   if [ $1 = $fail0 -o $2 = $fail0 -o $3 = $fail0 ]; then
+       echo ERROR: $member1 must not contain $fail0: $@
+       ret=1
+   fi
+   d1=$1
+   mdadm -E $d1 >$tmp
+   if ! grep -q 'state\[1\] : Optimal, Consistent' $tmp; then
+       echo ERROR: member 1 should be optimal in meta data
+       ret=1
+   fi
+   state0=Degraded
+else
+   # Creation unsuccessful - spare was used for member 0
+   state0=Optimal
+fi
+
+# need to delay a little bit, sometimes the meta data aren't
+# up-to-date yet
+sleep 0.5
+set -- $(get_raiddisks $member0)
+if [ $1 = $fail0 -o $2 = $fail0 ]; then
+    echo ERROR: $member0 must not contain $fail0: $@
+    ret=1
+fi
+d0=$1
+
+[ -f $tmp ] || mdadm -E $d0 >$tmp
+
+if ! grep -q 'state\[0\] : '$state0', Consistent' $tmp; then
+    echo ERROR: member 0 should be $state0 in meta data
+    ret=1
+fi
+if ! grep -q 'Offline, Failed' $tmp; then
+    echo ERROR: Failed disk expected in meta data
+    ret=1
+fi
+if [ $ret -eq 1 ]; then
+    cat /proc/mdstat
+    mdadm -E $d0
+    mdadm -E $d1
+    mdadm -E $fail0
+fi
+
+[ -f /tmp/mdmon.txt ] && {
+    cat /tmp/mdmon.txt
+    rm -f /tmp/mdmon.txt
+}
+
+rm -f $tmp
+[ $ret -eq 0 ]