update test/t-pvcreate-operation-md.sh attempt loading raid0.ko if raid0

isn't already available (in /proc/mdstat).

switch to requiring 2.6.33 for the alignment_offset tests; 2.6.{31,32}
alignment_offset values aren't reliable.  2.6.33 _should_ have mkp's
alignment_offset fixes but so far it doesn't (as of 2.6.33-rc4).

test/t-pvcreate-operation-md.sh

@@ -14,7 +14,9 @@ which sfdisk || exit 200
 which perl || exit 200
 which awk || exit 200
 which cut || exit 200
-test -f /proc/mdstat || exit 200
+
+test -f /proc/mdstat && grep -q raid0 /proc/mdstat || \
+modprobe raid0 || exit 200
 
 . ./test-utils.sh
 
@@ -66,7 +68,8 @@ check_pv_field_ $mddev pe_start $pv_align
 linux_minor=$(echo `uname -r` | cut -d'.' -f3 | cut -d'-' -f1)
 
 # Test newer topology-aware alignment detection
-if [ $linux_minor -gt 31 ]; then
+# - first added to 2.6.31 but not "reliable" until 2.6.33
+if [ $linux_minor -ge 33 ]; then
     pv_align="256.00k"
     pvcreate --metadatasize 128k \
 	--config 'devices { md_chunk_alignment=0 }' $mddev
@@ -74,7 +77,7 @@ if [ $linux_minor -gt 31 ]; then
 fi
 
 # partition MD array directly, depends on blkext in Linux >= 2.6.28
-if [ $linux_minor -gt 27 ]; then
+if [ $linux_minor -ge 28 ]; then
     # create one partition
     sfdisk $mddev <<EOF
 ,,83
@@ -95,7 +98,7 @@ EOF
 
     # Checking for 'alignment_offset' in sysfs implies Linux >= 2.6.31
     sysfs_alignment_offset=/sys/dev/block/${mddev_maj_min}/${base_mddev_p}/alignment_offset
-    [ -f $sysfs_alignment_offset ] && \
+    [ -f $sysfs_alignment_offset -a $linux_minor -ge 33 ] && \
 	alignment_offset=`cat $sysfs_alignment_offset` || \
 	alignment_offset=0