Merge branch 'master' into y/nodefs-cancel

* master:
  nodefs: Skip TestNodeParallelLookup on kernels that don't have CAP_PARALLEL_DIROPS
  Travis CI: Exercise tests both GOMAXPROCS=`nproc` and GOMAXPROCS=1
  Travis CI += Go 1.14, Go1.15

.travis.yml

@@ -11,8 +11,15 @@ go:
   - 1.11.x
   - 1.12.x
   - 1.13.x
+  - 1.14.x
+  - 1.15.x
   - master
 
+env:
+  - GOMAXPROCS=1
+  # vvv = native `nproc`
+  - GOMAXPROCS=
+
 matrix:
  fast_finish: true
  allow_failures:

fuse/test/node_parallel_lookup_test.go

@@ -98,6 +98,11 @@ func TestNodeParallelLookup(t *testing.T) {
 		}
 	}()
 
+	// the test will deadlock if the client cannot issue several lookups simultaneously
+	if srv.KernelSettings().Flags & fuse.CAP_PARALLEL_DIROPS == 0 {
+		t.Skip("Kernel serializes dir lookups")
+	}
+
 	// spawn 2 threads to access the files in parallel
 	// this will deadlock if nodefs does not allow simultaneous Lookups to be handled.
 	// see https://github.com/hanwen/go-fuse/commit/d0fca860 for context.