generic/{274,315}: Require falloc -k support

These test cases require filesystem support for FALLOC_FL_KEEP_SIZE
flag in fallocate().

Signed-off-by: Rostislav Skudnov <rostislav@tuxera.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
diff --git a/tests/generic/274 b/tests/generic/274
index 7d09386..a3f8c75 100755
--- a/tests/generic/274
+++ b/tests/generic/274
@@ -48,7 +48,7 @@
 _supported_fs generic
 _supported_os Linux
 _require_scratch
-_require_xfs_io_command "falloc"
+_require_xfs_io_command "falloc" "-k"
 
 echo "------------------------------"
 echo "preallocation test"
diff --git a/tests/generic/315 b/tests/generic/315
index 4433b6c..954f8a9 100755
--- a/tests/generic/315
+++ b/tests/generic/315
@@ -49,7 +49,7 @@
 _supported_fs generic
 _supported_os Linux
 _require_test
-_require_xfs_io_command "falloc"
+_require_xfs_io_command "falloc" "-k"
 
 rm -f $seqres.full