xfs: detect time limits from filesystem

Teach fstests to extract timestamp limits of a filesystem using the new
xfs_db timelimit command.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/common/xfs b/common/xfs
index a0721291..559d0046 100644
--- a/common/xfs
+++ b/common/xfs
@@ -1166,3 +1166,22 @@ _require_scratch_xfs_inobtcount()
 		_notrun "kernel doesn't support xfs inobtcount feature"
 	_scratch_unmount
 }
+
+_xfs_timestamp_range()
+{
+	local device="$1"
+	local use_db=0
+	local dbprog="$XFS_DB_PROG $device"
+	test "$device" = "$SCRATCH_DEV" && dbprog=_scratch_xfs_db
+
+	$dbprog -f -c 'help timelimit' | grep -v -q 'not found' && use_db=1
+	if [ $use_db -eq 0 ]; then
+		# The "timelimit" command was added to xfs_db at the same time
+		# that bigtime was added to xfsprogs.  Therefore, we can assume
+		# the old timestamp range if the command isn't present.
+		echo "-$((1<<31)) $(((1<<31)-1))"
+	else
+		$dbprog -f -c 'timelimit --compact' | \
+			awk '{printf("%s %s", $1, $2);}'
+	fi
+}