blob: 82781e6d34221bc06240e74ced617cb536683513 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
// Copyright 2019 The gVisor Authors.
//
// 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 vfs
import (
"gvisor.dev/gvisor/pkg/context"
)
// contextID is this package's type for context.Context.Value keys.
type contextID int
const (
// CtxMountNamespace is a Context.Value key for a MountNamespace.
CtxMountNamespace contextID = iota
// CtxRoot is a Context.Value key for a VFS root.
CtxRoot
)
// MountNamespaceFromContext returns the MountNamespace used by ctx. If ctx is
// not associated with a MountNamespace, MountNamespaceFromContext returns nil.
//
// A reference is taken on the returned MountNamespace.
func MountNamespaceFromContext(ctx context.Context) *MountNamespace {
if v := ctx.Value(CtxMountNamespace); v != nil {
return v.(*MountNamespace)
}
return nil
}
// RootFromContext returns the VFS root used by ctx. It takes a reference on
// the returned VirtualDentry. If ctx does not have a specific VFS root,
// RootFromContext returns a zero-value VirtualDentry.
func RootFromContext(ctx context.Context) VirtualDentry {
if v := ctx.Value(CtxRoot); v != nil {
return v.(VirtualDentry)
}
return VirtualDentry{}
}
|
