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Diffstat (limited to 'pkg/sentry/vfs/context.go')
-rw-r--r--pkg/sentry/vfs/context.go22
1 files changed, 18 insertions, 4 deletions
diff --git a/pkg/sentry/vfs/context.go b/pkg/sentry/vfs/context.go
index 32cf9151b..82781e6d3 100644
--- a/pkg/sentry/vfs/context.go
+++ b/pkg/sentry/vfs/context.go
@@ -15,7 +15,7 @@
package vfs
import (
- "gvisor.dev/gvisor/pkg/sentry/context"
+ "gvisor.dev/gvisor/pkg/context"
)
// contextID is this package's type for context.Context.Value keys.
@@ -24,14 +24,28 @@ 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. It does
-// not take a reference on the returned MountNamespace. If ctx is not
-// associated with a MountNamespace, MountNamespaceFromContext returns nil.
+// 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{}
+}