Plumbing context.Context to DecRef() and Release().

context is passed to DecRef() and Release() which is
needed for SO_LINGER implementation.

PiperOrigin-RevId: 324672584

8 files changed, 28 insertions, 25 deletions

diff --git a/pkg/sentry/fs/gofer/file.go b/pkg/sentry/fs/gofer/file.go
index b2fcab127..c0bc63a32 100644
--- a/pkg/sentry/fs/gofer/file.go
+++ b/pkg/sentry/fs/gofer/file.go
@@ -114,7 +114,7 @@ func NewFile(ctx context.Context, dirent *fs.Dirent, name string, flags fs.FileF
 }
 
 // Release implements fs.FileOpeations.Release.
-func (f *fileOperations) Release() {
+func (f *fileOperations) Release(context.Context) {
 	f.handles.DecRef()
 }
 
@@ -122,7 +122,7 @@ func (f *fileOperations) Release() {
 func (f *fileOperations) Readdir(ctx context.Context, file *fs.File, serializer fs.DentrySerializer) (int64, error) {
 	root := fs.RootFromContext(ctx)
 	if root != nil {
-		defer root.DecRef()
+		defer root.DecRef(ctx)
 	}
 
 	dirCtx := &fs.DirCtx{
diff --git a/pkg/sentry/fs/gofer/gofer_test.go b/pkg/sentry/fs/gofer/gofer_test.go
index 2df2fe889..326fed954 100644
--- a/pkg/sentry/fs/gofer/gofer_test.go
+++ b/pkg/sentry/fs/gofer/gofer_test.go
@@ -232,7 +232,7 @@ func TestRevalidation(t *testing.T) {
 
 			// We must release the dirent, of the test will fail
 			// with a reference leak. This is tracked by p9test.
-			defer dirent.DecRef()
+			defer dirent.DecRef(ctx)
 
 			// Walk again. Depending on the cache policy, we may
 			// get a new dirent.
@@ -246,7 +246,7 @@ func TestRevalidation(t *testing.T) {
 			if !test.preModificationWantReload && dirent != newDirent {
 				t.Errorf("Lookup with cachePolicy=%s got new dirent %+v, wanted old dirent %+v", test.cachePolicy, newDirent, dirent)
 			}
-			newDirent.DecRef() // See above.
+			newDirent.DecRef(ctx) // See above.
 
 			// Modify the underlying mocked file's modification
 			// time for the next walk that occurs.
@@ -287,7 +287,7 @@ func TestRevalidation(t *testing.T) {
 			if test.postModificationWantUpdatedAttrs && gotModTimeSeconds != nowSeconds {
 				t.Fatalf("Lookup with cachePolicy=%s got new modification time %v, wanted %v", test.cachePolicy, gotModTimeSeconds, nowSeconds)
 			}
-			newDirent.DecRef() // See above.
+			newDirent.DecRef(ctx) // See above.
 
 			// Remove the file from the remote fs, subsequent walks
 			// should now fail to find anything.
@@ -303,7 +303,7 @@ func TestRevalidation(t *testing.T) {
 				t.Errorf("Lookup with cachePolicy=%s got new dirent and error %v, wanted old dirent and nil error", test.cachePolicy, err)
 			}
 			if err == nil {
-				newDirent.DecRef() // See above.
+				newDirent.DecRef(ctx) // See above.
 			}
 		})
 	}
diff --git a/pkg/sentry/fs/gofer/handles.go b/pkg/sentry/fs/gofer/handles.go
index fc14249be..f324dbf26 100644
--- a/pkg/sentry/fs/gofer/handles.go
+++ b/pkg/sentry/fs/gofer/handles.go
@@ -47,7 +47,8 @@ type handles struct {
 
 // DecRef drops a reference on handles.
 func (h *handles) DecRef() {
-	h.DecRefWithDestructor(func() {
+	ctx := context.Background()
+	h.DecRefWithDestructor(ctx, func(context.Context) {
 		if h.Host != nil {
 			if h.isHostBorrowed {
 				h.Host.Release()
@@ -57,7 +58,7 @@ func (h *handles) DecRef() {
 				}
 			}
 		}
-		if err := h.File.close(context.Background()); err != nil {
+		if err := h.File.close(ctx); err != nil {
 			log.Warningf("error closing p9 file: %v", err)
 		}
 	})
diff --git a/pkg/sentry/fs/gofer/inode.go b/pkg/sentry/fs/gofer/inode.go
index 51d7368a1..3a225fd39 100644
--- a/pkg/sentry/fs/gofer/inode.go
+++ b/pkg/sentry/fs/gofer/inode.go
@@ -441,8 +441,9 @@ func (i *inodeOperations) Release(ctx context.Context) {
 	// asynchronously.
 	//
 	// We use AsyncWithContext to avoid needing to allocate an extra
-	// anonymous function on the heap.
-	fs.AsyncWithContext(ctx, i.fileState.Release)
+	// anonymous function on the heap. We must use background context
+	// because the async work cannot happen on the task context.
+	fs.AsyncWithContext(context.Background(), i.fileState.Release)
 }
 
 // Mappable implements fs.InodeOperations.Mappable.
diff --git a/pkg/sentry/fs/gofer/path.go b/pkg/sentry/fs/gofer/path.go
index cf9800100..3c66dc3c2 100644
--- a/pkg/sentry/fs/gofer/path.go
+++ b/pkg/sentry/fs/gofer/path.go
@@ -168,7 +168,7 @@ func (i *inodeOperations) Create(ctx context.Context, dir *fs.Inode, name string
 
 	// Construct the positive Dirent.
 	d := fs.NewDirent(ctx, fs.NewInode(ctx, iops, dir.MountSource, sattr), name)
-	defer d.DecRef()
+	defer d.DecRef(ctx)
 
 	// Construct the new file, caching the handles if allowed.
 	h := handles{
@@ -371,7 +371,7 @@ func (i *inodeOperations) Remove(ctx context.Context, dir *fs.Inode, name string
 		// Find out if file being deleted is a socket or pipe that needs to be
 		// removed from endpoint map.
 		if d, err := i.Lookup(ctx, dir, name); err == nil {
-			defer d.DecRef()
+			defer d.DecRef(ctx)
 
 			if fs.IsSocket(d.Inode.StableAttr) || fs.IsPipe(d.Inode.StableAttr) {
 				switch iops := d.Inode.InodeOperations.(type) {
@@ -392,7 +392,7 @@ func (i *inodeOperations) Remove(ctx context.Context, dir *fs.Inode, name string
 		return err
 	}
 	if key != nil {
-		i.session().overrides.remove(*key)
+		i.session().overrides.remove(ctx, *key)
 	}
 	i.touchModificationAndStatusChangeTime(ctx, dir)
 
diff --git a/pkg/sentry/fs/gofer/session.go b/pkg/sentry/fs/gofer/session.go
index b5efc86f2..7cf3522ff 100644
--- a/pkg/sentry/fs/gofer/session.go
+++ b/pkg/sentry/fs/gofer/session.go
@@ -89,10 +89,10 @@ func (e *overrideMaps) addPipe(key device.MultiDeviceKey, d *fs.Dirent, inode *f
 // remove deletes the key from the maps.
 //
 // Precondition: maps must have been locked with 'lock'.
-func (e *overrideMaps) remove(key device.MultiDeviceKey) {
+func (e *overrideMaps) remove(ctx context.Context, key device.MultiDeviceKey) {
 	endpoint := e.keyMap[key]
 	delete(e.keyMap, key)
-	endpoint.dirent.DecRef()
+	endpoint.dirent.DecRef(ctx)
 }
 
 // lock blocks other addition and removal operations from happening while
@@ -197,7 +197,7 @@ type session struct {
 }
 
 // Destroy tears down the session.
-func (s *session) Destroy() {
+func (s *session) Destroy(ctx context.Context) {
 	s.client.Close()
 }
 
@@ -329,7 +329,7 @@ func Root(ctx context.Context, dev string, filesystem fs.Filesystem, superBlockF
 	s.client, err = p9.NewClient(conn, s.msize, s.version)
 	if err != nil {
 		// Drop our reference on the session, it needs to be torn down.
-		s.DecRef()
+		s.DecRef(ctx)
 		return nil, err
 	}
 
@@ -340,7 +340,7 @@ func Root(ctx context.Context, dev string, filesystem fs.Filesystem, superBlockF
 	ctx.UninterruptibleSleepFinish(false)
 	if err != nil {
 		// Same as above.
-		s.DecRef()
+		s.DecRef(ctx)
 		return nil, err
 	}
 
@@ -348,7 +348,7 @@ func Root(ctx context.Context, dev string, filesystem fs.Filesystem, superBlockF
 	if err != nil {
 		s.attach.close(ctx)
 		// Same as above, but after we execute the Close request.
-		s.DecRef()
+		s.DecRef(ctx)
 		return nil, err
 	}
 
@@ -393,13 +393,13 @@ func (s *session) fillKeyMap(ctx context.Context) error {
 
 // fillPathMap populates paths for overrides from dirents in direntMap
 // before save.
-func (s *session) fillPathMap() error {
+func (s *session) fillPathMap(ctx context.Context) error {
 	unlock := s.overrides.lock()
 	defer unlock()
 
 	for _, endpoint := range s.overrides.keyMap {
 		mountRoot := endpoint.dirent.MountRoot()
-		defer mountRoot.DecRef()
+		defer mountRoot.DecRef(ctx)
 		dirPath, _ := endpoint.dirent.FullName(mountRoot)
 		if dirPath == "" {
 			return fmt.Errorf("error getting path from dirent")
diff --git a/pkg/sentry/fs/gofer/session_state.go b/pkg/sentry/fs/gofer/session_state.go
index 2d398b753..48b423dd8 100644
--- a/pkg/sentry/fs/gofer/session_state.go
+++ b/pkg/sentry/fs/gofer/session_state.go
@@ -26,7 +26,8 @@ import (
 // beforeSave is invoked by stateify.
 func (s *session) beforeSave() {
 	if s.overrides != nil {
-		if err := s.fillPathMap(); err != nil {
+		ctx := &dummyClockContext{context.Background()}
+		if err := s.fillPathMap(ctx); err != nil {
 			panic("failed to save paths to override map before saving" + err.Error())
 		}
 	}
diff --git a/pkg/sentry/fs/gofer/socket.go b/pkg/sentry/fs/gofer/socket.go
index 40f2c1cad..8a1c69ac2 100644
--- a/pkg/sentry/fs/gofer/socket.go
+++ b/pkg/sentry/fs/gofer/socket.go
@@ -134,14 +134,14 @@ func (e *endpoint) UnidirectionalConnect(ctx context.Context) (transport.Connect
 
 	// We don't need the receiver.
 	c.CloseRecv()
-	c.Release()
+	c.Release(ctx)
 
 	return c, nil
 }
 
 // Release implements transport.BoundEndpoint.Release.
-func (e *endpoint) Release() {
-	e.inode.DecRef()
+func (e *endpoint) Release(ctx context.Context) {
+	e.inode.DecRef(ctx)
 }
 
 // Passcred implements transport.BoundEndpoint.Passcred.