Check in gVisor.

PiperOrigin-RevId: 194583126
Change-Id: Ica1d8821a90f74e7e745962d71801c598c652463

1 files changed, 60 insertions, 0 deletions

diff --git a/pkg/sentry/fs/gofer/util.go b/pkg/sentry/fs/gofer/util.go
new file mode 100644
index 000000000..d9ed8c81e
--- /dev/null
+++ b/pkg/sentry/fs/gofer/util.go
@@ -0,0 +1,60 @@
+// Copyright 2018 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package gofer
+
+import (
+	"syscall"
+
+	"gvisor.googlesource.com/gvisor/pkg/p9"
+	"gvisor.googlesource.com/gvisor/pkg/sentry/context"
+	"gvisor.googlesource.com/gvisor/pkg/sentry/fs"
+)
+
+func utimes(ctx context.Context, file contextFile, ts fs.TimeSpec) error {
+	if ts.ATimeOmit && ts.MTimeOmit {
+		return nil
+	}
+	mask := p9.SetAttrMask{
+		ATime:              !ts.ATimeOmit,
+		ATimeNotSystemTime: !ts.ATimeSetSystemTime,
+		MTime:              !ts.MTimeOmit,
+		MTimeNotSystemTime: !ts.MTimeSetSystemTime,
+	}
+	as, ans := ts.ATime.Unix()
+	ms, mns := ts.MTime.Unix()
+	attr := p9.SetAttr{
+		ATimeSeconds:     uint64(as),
+		ATimeNanoSeconds: uint64(ans),
+		MTimeSeconds:     uint64(ms),
+		MTimeNanoSeconds: uint64(mns),
+	}
+	// 9p2000.L SetAttr: "If a time bit is set without the corresponding SET bit,
+	// the current system time on the server is used instead of the value sent
+	// in the request."
+	return file.setAttr(ctx, mask, attr)
+}
+
+func openFlagsFromPerms(p fs.PermMask) (p9.OpenFlags, error) {
+	switch {
+	case p.Read && p.Write:
+		return p9.ReadWrite, nil
+	case p.Write:
+		return p9.WriteOnly, nil
+	case p.Read:
+		return p9.ReadOnly, nil
+	default:
+		return 0, syscall.EINVAL
+	}
+}