[PATCHv2 1/2] common/rc: Add whitelisted FS support in _require_scratch_swapfile()

[Ritesh Harjani <riteshh@linux.ibm.com>]

Filesystems e.g. ext4 and XFS supports swapon by default and an error
returned with swapon should be treated as a failure. Hence
add ext4/xfs as whitelisted fstype in _require_scratch_swapfile()

Signed-off-by: Ritesh Harjani <riteshh@linux.ibm.com>
---
v1->v2: Addressed comments from Eryu @[1]
[1]: https://patchwork.kernel.org/project/fstests/cover/cover.1604000570.git.riteshh@linux.ibm.com/

 common/rc | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/common/rc b/common/rc
index 33b5b598a198..635b77a005c6 100644
--- a/common/rc
+++ b/common/rc
@@ -2380,6 +2380,7 @@ _format_swapfile() {
 # Check that the filesystem supports swapfiles
 _require_scratch_swapfile()
 {
+	local fstyp=$FSTYP
 	_require_scratch
 	_require_command "$MKSWAP_PROG" "mkswap"

@@ -2401,10 +2402,21 @@ _require_scratch_swapfile()
 	# Minimum size for mkswap is 10 pages
 	_format_swapfile "$SCRATCH_MNT/swap" $(($(get_page_size) * 10))

-	if ! swapon "$SCRATCH_MNT/swap" >/dev/null 2>&1; then
-		_scratch_unmount
-		_notrun "swapfiles are not supported"
-	fi
+	# For whitelisted fstyp swapon should not fail.
+	case "$fstyp" in
+	ext4|xfs)
+		if ! swapon "$SCRATCH_MNT/swap" >/dev/null 2>&1; then
+			_scratch_unmount
+			_fail "swapon failed for $fstyp"
+		fi
+		;;
+	*)
+		if ! swapon "$SCRATCH_MNT/swap" >/dev/null 2>&1; then
+			_scratch_unmount
+			_notrun "swapfiles are not supported"
+		fi
+		;;
+	esac

 	swapoff "$SCRATCH_MNT/swap" >/dev/null 2>&1
 	_scratch_unmount
--
2.26.2