[PATCHv3 1/2] common/rc: swapon should not fail for given FS in _require_scratch_swapfile()

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

Filesystems e.g. ext* and XFS supports swapon by default and an error
returned with swapon should be treated as a failure.

Signed-off-by: Ritesh Harjani <riteshh@linux.ibm.com>
---
v2 -> v3:
1. Removed whitelisted naming convention.
2. Added ext2/ext3 as well as supported FS for swapon.
3. Removed local variable $fstyp, instead used $FSTYP directly in switch case.

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

diff --git a/common/rc b/common/rc
index 33b5b598a198..649b1cfd884a 100644
--- a/common/rc
+++ b/common/rc
@@ -2401,10 +2401,22 @@ _require_scratch_swapfile()
 	# Minimum size for mkswap is 10 pages
 	_format_swapfile "$SCRATCH_MNT/swap" $(($(get_page_size) * 10))

-	if ! swapon "$SCRATCH_MNT/swap" >/dev/null 2>&1; then
-		_scratch_unmount
-		_notrun "swapfiles are not supported"
-	fi
+	# ext* and xfs have supported all variants of swap files since their
+	# introduction, so swapon should not fail.
+	case "$FSTYP" in
+	ext2|ext3|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