Inline vfs.VirtualFilesystem in Kernel struct

This saves one pointer dereference per VFS access.

Updates #1623

PiperOrigin-RevId: 295216176

1 files changed, 7 insertions, 2 deletions

diff --git a/pkg/sentry/kernel/kernel.go b/pkg/sentry/kernel/kernel.go
index 2665f057c..ea21af33f 100644
--- a/pkg/sentry/kernel/kernel.go
+++ b/pkg/sentry/kernel/kernel.go
@@ -246,7 +246,7 @@ type Kernel struct {
 	SpecialOpts
 
 	// VFS keeps the filesystem state used across the kernel.
-	VFS *vfs.VirtualFilesystem
+	vfs vfs.VirtualFilesystem
 }
 
 // InitKernelArgs holds arguments to Init.
@@ -815,7 +815,7 @@ func (k *Kernel) CreateProcess(args CreateProcessArgs) (*ThreadGroup, ThreadID,
 				FollowFinalSymlink: true,
 			}
 			var err error
-			wd, err = k.VFS.GetDentryAt(ctx, args.Credentials, &pop, &vfs.GetDentryOptions{
+			wd, err = k.VFS().GetDentryAt(ctx, args.Credentials, &pop, &vfs.GetDentryOptions{
 				CheckSearchable: true,
 			})
 			if err != nil {
@@ -1506,3 +1506,8 @@ func (k *Kernel) EmitUnimplementedEvent(ctx context.Context) {
 		Registers: t.Arch().StateData().Proto(),
 	})
 }
+
+// VFS returns the virtual filesystem for the kernel.
+func (k *Kernel) VFS() *vfs.VirtualFilesystem {
+	return &k.vfs
+}