xfs/49[12]: skip pre-lazysbcount filesystems

Prior to lazysbcount, the xfs mount code blindly trusted the value of
the fdblocks counter in the primary super, which means that the kernel
doesn't detect the fuzzed fdblocks value at all.  V4 is deprecated and
pre-lazysbcount V4 hasn't been the default for ~14 years, so we'll just
skip these two tests on those old filesystems.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>

common/xfs

@@ -1144,6 +1144,18 @@ _check_scratch_xfs_features()
 	test "${found}" -eq "$#"
 }
 
+# Skip a test if any of the given fs features aren't present on the scratch
+# filesystem.  The scratch fs must have been formatted already.
+_require_scratch_xfs_features()
+{
+	local features="$(_scratch_xfs_db -c 'version' 2>/dev/null)"
+
+	for feature in "$@"; do
+		echo "${features}" | grep -q -w "${feature}" ||
+			_notrun "Missing scratch feature: ${feature}"
+	done
+}
+
 # Decide if xfs_repair knows how to set (or clear) a filesystem feature.
 _require_xfs_repair_upgrade()
 {

tests/xfs/491

@@ -36,6 +36,10 @@ _require_scratch
 
 echo "Format and mount"
 _scratch_mkfs > $seqres.full 2>&1
+
+# pre-lazysbcount filesystems blindly trust the primary sb fdblocks
+_require_scratch_xfs_features LAZYSBCOUNT
+
 _scratch_mount >> $seqres.full 2>&1
 echo "test file" > $SCRATCH_MNT/testfile
 

tests/xfs/492

@@ -36,6 +36,10 @@ _require_scratch
 
 echo "Format and mount"
 _scratch_mkfs > $seqres.full 2>&1
+
+# pre-lazysbcount filesystems blindly trust the primary sb fdblocks
+_require_scratch_xfs_features LAZYSBCOUNT
+
 _scratch_mount >> $seqres.full 2>&1
 echo "test file" > $SCRATCH_MNT/testfile