Get rid of kernfs.Inode.Destroy.

This interface method is unneeded.

PiperOrigin-RevId: 327370325

pkg/sentry/fsimpl/host/host.go

@@ -432,17 +432,14 @@ func (i *inode) SetStat(ctx context.Context, fs *vfs.Filesystem, creds *auth.Cre
 
 // DecRef implements kernfs.Inode.
 func (i *inode) DecRef(ctx context.Context) {
-	i.AtomicRefCount.DecRefWithDestructor(ctx, i.Destroy)
-}
-
-// Destroy implements kernfs.Inode.
-func (i *inode) Destroy(context.Context) {
-	if i.wouldBlock {
-		fdnotifier.RemoveFD(int32(i.hostFD))
-	}
-	if err := unix.Close(i.hostFD); err != nil {
-		log.Warningf("failed to close host fd %d: %v", i.hostFD, err)
-	}
+	i.AtomicRefCount.DecRefWithDestructor(ctx, func(context.Context) {
+		if i.wouldBlock {
+			fdnotifier.RemoveFD(int32(i.hostFD))
+		}
+		if err := unix.Close(i.hostFD); err != nil {
+			log.Warningf("failed to close host fd %d: %v", i.hostFD, err)
+		}
+	})
 }
 
 // Open implements kernfs.Inode.

pkg/sentry/fsimpl/kernfs/inode_impl_util.go

@@ -48,10 +48,6 @@ func (InodeNoopRefCount) TryIncRef() bool {
 	return true
 }
 
-// Destroy implements Inode.Destroy.
-func (InodeNoopRefCount) Destroy(context.Context) {
-}
-
 // InodeDirectoryNoNewChildren partially implements the Inode interface.
 // InodeDirectoryNoNewChildren represents a directory inode which does not
 // support creation of new children.
@@ -367,15 +363,12 @@ func (o *OrderedChildren) Init(opts OrderedChildrenOptions) {
 
 // DecRef implements Inode.DecRef.
 func (o *OrderedChildren) DecRef(ctx context.Context) {
-	o.AtomicRefCount.DecRefWithDestructor(ctx, o.Destroy)
-}
-
-// Destroy cleans up resources referenced by this OrderedChildren.
-func (o *OrderedChildren) Destroy(context.Context) {
-	o.mu.Lock()
-	defer o.mu.Unlock()
-	o.order.Reset()
-	o.set = nil
+	o.AtomicRefCount.DecRefWithDestructor(ctx, func(context.Context) {
+		o.mu.Lock()
+		defer o.mu.Unlock()
+		o.order.Reset()
+		o.set = nil
+	})
 }
 
 // Populate inserts children into this OrderedChildren, and d's dentry

pkg/sentry/fsimpl/kernfs/kernfs.go

@@ -328,10 +328,6 @@ type inodeRefs interface {
 	IncRef()
 	DecRef(ctx context.Context)
 	TryIncRef() bool
-	// Destroy is called when the inode reaches zero references. Destroy release
-	// all resources (references) on objects referenced by the inode, including
-	// any child dentries.
-	Destroy(ctx context.Context)
 }
 
 type inodeMetadata interface {