ext4: regression test for wrong assert in ext4_mb_normalize_request()

Regression test for:
    b5b6077 ext4: fix wrong assert in ext4_mb_normalize_request()

Meanwhile make minor changes to _scratch_mkfs_ext4() in common/rc,
_scratch_mkfs_ext4() might fail due to conflicts between being passed options
and MKFS_OPTIONS. We fix this by ignoring MKFS_OPTIONS if it fails the first
time(see _scratch_mkfs_xfs()), as suggested by Lukas Czerner.

[dchinner: converted to use xfs_io]

Signed-off-by: Xiaoguang Wang <wangxg.fnst@cn.fujitsu.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

common/rc

@@ -446,12 +446,31 @@ _setup_large_ext4_fs()
 
 _scratch_mkfs_ext4()
 {
+	# extra mkfs options can be added by tests
+	local extra_mkfs_options=$*
+
 	local tmp_dir=/tmp/
 
-	/sbin/mkfs -t $FSTYP -- -F $MKFS_OPTIONS $* $SCRATCH_DEV \
+	/sbin/mkfs -t ext4 -- -F $MKFS_OPTIONS $extra_mkfs_options $SCRATCH_DEV \
 			2>$tmp_dir.mkfserr 1>$tmp_dir.mkfsstd
 	local mkfs_status=$?
 
+	# a mkfs failure may be caused by conflicts between
+	# $MKFS_OPTIONS and $extra_mkfs_options
+	if [ $mkfs_status -ne 0 -a ! -z "$extra_mkfs_options" ]; then
+		(
+		echo -n "** mkfs failed with extra mkfs options "
+		echo "added to \"$MKFS_OPTIONS\" by test $seq **"
+		echo -n "** attempting to mkfs using only test $seq "
+		echo "options: $extra_mkfs_options **"
+		) >> $seqres.full
+
+		# running mkfs again. overwrite previous mkfs output files
+		/sbin/mkfs -t ext4 -- -F $extra_mkfs_options $SCRATCH_DEV \
+				2>$tmp_dir.mkfserr 1>$tmp_dir.mkfsstd
+		local mkfs_status=$?
+	fi
+
 	if [ $mkfs_status -eq 0 -a "$LARGE_SCRATCH_DEV" = yes ]; then
 		# manually parse the mkfs output to get the fs size in bytes
 		fs_size=`cat $tmp_dir.mkfsstd | awk ' \
@@ -1163,6 +1182,24 @@ _require_xfs_crc()
 	umount $SCRATCH_MNT
 }
 
+# this test requires the bigalloc feature to be available in mkfs.ext4
+#
+_require_ext4_mkfs_bigalloc()
+{
+	_scratch_mkfs_ext4 -O bigalloc >/dev/null 2>&1 \
+	   || _notrun "mkfs.ext4 doesn't have bigalloc feature"
+}
+
+# this test requires the ext4 kernel support bigalloc feature
+#
+_require_ext4_bigalloc()
+{
+	_scratch_mkfs_ext4 -O bigalloc >/dev/null 2>&1
+	_scratch_mount >/dev/null 2>&1 \
+	   || _notrun "Ext4 kernel doesn't support bigalloc feature"
+	umount $SCRATCH_MNT
+}
+
 # this test requires the finobt feature to be available in mkfs.xfs
 #
 _require_xfs_mkfs_finobt()

tests/ext4/003

@@ -0,0 +1,54 @@
+#! /bin/bash
+# FS QA Test No. ext4/003
+#
+# Regression test for commit:
+# b5b6077 ext4: fix wrong assert in ext4_mb_normalize_request()
+# This testcase checks whether this bug has been fixed.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2014 Fujitsu.  All Rights Reserved.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it would be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#-----------------------------------------------------------------------
+
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+    _scratch_unmount
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# real QA test starts here
+_supported_fs ext4
+_supported_os Linux
+
+_require_scratch
+_require_ext4_mkfs_bigalloc
+_require_ext4_bigalloc
+
+rm -f $seqres.full
+
+yes | mkfs.ext4 -O bigalloc -C 65536  -g 256 $SCRATCH_DEV 512m \
+	>> $seqres.full 2>&1
+_scratch_mount || _fail "couldn't mount fs"
+
+$XFS_IO_PROG -f -c "pwrite 0 256m -b 1M" $SCRATCH_MNT/testfile 2>&1 | \
+	_filter_xfs_io
+
+status=0
+exit

tests/ext4/003.out

@@ -0,0 +1,3 @@
+QA output created by 003
+wrote 268435456/268435456 bytes at offset 0
+XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)

tests/ext4/group

@@ -5,6 +5,7 @@
 #
 001 auto prealloc quick
 002 auto quick prealloc
+003 auto quick
 271 auto rw quick
 301 aio dangerous ioctl rw stress
 302 aio dangerous ioctl rw stress