Report filesystem-specific mount options.

PiperOrigin-RevId: 362406813

1 files changed, 6 insertions, 2 deletions

diff --git a/pkg/sentry/vfs/mount.go b/pkg/sentry/vfs/mount.go
index bac9eb905..922f9e697 100644
--- a/pkg/sentry/vfs/mount.go
+++ b/pkg/sentry/vfs/mount.go
@@ -959,13 +959,17 @@ func manglePath(p string) string {
 // superBlockOpts returns the super block options string for the the mount at
 // the given path.
 func superBlockOpts(mountPath string, mnt *Mount) string {
-	// gVisor doesn't (yet) have a concept of super block options, so we
-	// use the ro/rw bit from the mount flag.
+	// Compose super block options by combining global mount flags with
+	// FS-specific mount options.
 	opts := "rw"
 	if mnt.ReadOnly() {
 		opts = "ro"
 	}
 
+	if mopts := mnt.fs.Impl().MountOptions(); mopts != "" {
+		opts += "," + mopts
+	}
+
 	// NOTE(b/147673608): If the mount is a cgroup, we also need to include
 	// the cgroup name in the options. For now we just read that from the
 	// path.