[PATCH v1.2 5/5] xfs/49[12]: skip pre-lazysbcount filesystems

["Darrick J. Wong" <djwong@kernel.org>]

From: Darrick J. Wong <djwong@kernel.org>

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>
---
v1.2: factor the feature checking into a separate helper
---
 common/xfs    |   12 ++++++++++++
 tests/xfs/491 |    4 ++++
 tests/xfs/492 |    4 ++++
 3 files changed, 20 insertions(+)

diff --git a/common/xfs b/common/xfs
index 8501b084..92383061 100644
--- a/common/xfs
+++ b/common/xfs
@@ -1129,6 +1129,18 @@ _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()
 {
diff --git a/tests/xfs/491 b/tests/xfs/491
index 6420202b..7d447ccf 100755
--- a/tests/xfs/491
+++ b/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
 
diff --git a/tests/xfs/492 b/tests/xfs/492
index 522def47..21c6872f 100755
--- a/tests/xfs/492
+++ b/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