[PATCH blktests 1/2] nvme/rc: introduce helper functions to check namespace metadata

[Shin'ichiro Kawasaki]

To confirm that the TEST_DEV namespace has metadata area for each LBA or
not, introduce the helper function _test_dev_has_metadata(), which
checks the sysfs attribute metadata_bytes.

Also, to confirm that the metadata is not used as the extended LBA,
introduce the helper function _test_dev_disables_extended_lba(), which
checks the NVME_NS_FLBAS_META_EXT flag in the flbas field.

Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki at wdc.com>
---
 tests/nvme/rc | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/tests/nvme/rc b/tests/nvme/rc
index 9dbd1ce..215a10a 100644
--- a/tests/nvme/rc
+++ b/tests/nvme/rc
@@ -153,6 +153,29 @@ _require_test_dev_is_not_nvme_multipath() {
 	return 0
 }
 
+_test_dev_has_metadata() {
+	if (( ! $(<"${TEST_DEV_SYSFS}/metadata_bytes") )); then
+		SKIP_REASONS+=("$TEST_DEV does not have metadata")
+		return 1
+	fi
+	return 0
+}
+
+_test_dev_disables_extended_lba() {
+	local flbas
+
+	if ! flbas=$(nvme id-ns "$TEST_DEV" | grep flbas | \
+			     sed --quiet 's/.*: \(.*\)/\1/p'); then
+		SKIP_REASONS+=("$TEST_DEV does not have namespace flbas field")
+		return 1
+	fi
+	if (( flbas & 0x10 )); then
+		SKIP_REASONS+=("$TEST_DEV enables NVME_NS_FLBAS_META_EXT")
+		return 1
+	fi
+	return 0
+}
+
 _require_nvme_test_img_size() {
 	local require_sz_mb
 	local nvme_img_size_mb
-- 
2.49.0