[PATCH] fstests: be compatible with older mkfs.xfs which has no v5 support

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With the change to CRCs by default, some tests are updated to call mkfs
with "-m crc=0" option directly, and this breaks testings on older
distros where mkfs.xfs doesn't have crc support.

Introduce a new variable to tell if mkfs.xfs supports v5 xfs and do
tweaks in _scratch_mkfs_xfs_opts() based on it.

Signed-off-by: Eryu Guan <eguan@xxxxxxxxxx>
---

This is based on Dave's commit "filter: inode size output of mkfs.xfs can change"

Tested on upstream kernel with upstream xfsprogs(v5 as default) and on RHEL7(v4
as default) and on RHEL6(no v5 support), all seem fine, no failures caused by
crc options.

 check         | 10 +++++++++-
 common/rc     |  5 +++++
 tests/xfs/073 |  4 +++-
 3 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/check b/check
index 4fa96ed..568c05b 100755
--- a/check
+++ b/check
@@ -505,9 +505,17 @@ for section in $HOST_OPTIONS_SECTIONS; do
 
 	if [ ! -z "$SCRATCH_DEV" ]; then
 	  umount $SCRATCH_DEV 2>/dev/null
+
+	  # check if mkfs.xfs supports v5 xfs
+	  if [ "$FSTYP" == "xfs" ]; then
+		export XFS_MKFS_HAS_NO_META_SUPPORT=""
+		if ! _scratch_mkfs -m crc=0 >/dev/null 2>&1; then
+			export XFS_MKFS_HAS_NO_META_SUPPORT=true
+		fi
+	  fi
+
 	  # call the overridden mkfs - make sure the FS is built
 	  # the same as we'll create it later.
-
 	  if ! _scratch_mkfs $flag >$tmp.err 2>&1
 	  then
 	      echo "our local _scratch_mkfs routine ..."
diff --git a/common/rc b/common/rc
index 242dedb..6af7f14 100644
--- a/common/rc
+++ b/common/rc
@@ -308,6 +308,11 @@ _scratch_mkfs_xfs_opts()
 {
 	mkfs_opts=$*
 
+	# remove crc related mkfs options if mkfs.xfs doesn't support v5 support
+	if [ -n "$XFS_MKFS_HAS_NO_META_SUPPORT" ]; then
+		mkfs_opts=`echo $mkfs_opts | sed "s/-m\s\+crc=.//"`
+	fi
+
 	_scratch_options mkfs
 
 	$MKFS_XFS_PROG $SCRATCH_OPTIONS $mkfs_opts $SCRATCH_DEV
diff --git a/tests/xfs/073 b/tests/xfs/073
index 45a3fdf..acac8b8 100755
--- a/tests/xfs/073
+++ b/tests/xfs/073
@@ -156,7 +156,9 @@ _verify_copy $imgs.image $SCRATCH_DEV $SCRATCH_MNT
 
 echo 
 echo === copying scratch device to single target, large ro device
-${MKFS_XFS_PROG} -m crc=0 -dfile,name=$imgs.source,size=100g | _filter_mkfs 2>/dev/null
+mkfs_crc_opts="-m crc=0"
+[ -n "$XFS_MKFS_HAS_NO_META_SUPPORT" ] && mkfs_crc_opts=""
+${MKFS_XFS_PROG} $mkfs_crc_opts -dfile,name=$imgs.source,size=100g | _filter_mkfs 2>/dev/null
 rmdir $imgs.source_dir 2>/dev/null
 mkdir $imgs.source_dir
 
-- 
1.8.3.1

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