Add more descriptive comments on mount options.

PiperOrigin-RevId: 333447255

2 files changed, 8 insertions, 5 deletions

diff --git a/pkg/sentry/vfs/filesystem_type.go b/pkg/sentry/vfs/filesystem_type.go
index f2298f7f6..82ae35fdc 100644
--- a/pkg/sentry/vfs/filesystem_type.go
+++ b/pkg/sentry/vfs/filesystem_type.go
@@ -56,9 +56,10 @@ type registeredFilesystemType struct {
 // RegisterFilesystemTypeOptions contains options to
 // VirtualFilesystem.RegisterFilesystem().
 type RegisterFilesystemTypeOptions struct {
-	// If AllowUserMount is true, allow calls to VirtualFilesystem.MountAt()
-	// for which MountOptions.InternalMount == false to use this filesystem
-	// type.
+	// AllowUserMount determines whether users are allowed to mount a file system
+	// of this type, i.e. through mount(2). If AllowUserMount is true, allow calls
+	// to VirtualFilesystem.MountAt() for which MountOptions.InternalMount == false
+	// to use this filesystem type.
 	AllowUserMount bool
 
 	// If AllowUserList is true, make this filesystem type visible in
diff --git a/pkg/sentry/vfs/options.go b/pkg/sentry/vfs/options.go
index b33d36cb1..413cfb101 100644
--- a/pkg/sentry/vfs/options.go
+++ b/pkg/sentry/vfs/options.go
@@ -103,8 +103,10 @@ type MountOptions struct {
 	// GetFilesystemOptions contains options to FilesystemType.GetFilesystem().
 	GetFilesystemOptions GetFilesystemOptions
 
-	// If InternalMount is true, allow the use of filesystem types for which
-	// RegisterFilesystemTypeOptions.AllowUserMount == false.
+	// InternalMount indicates whether the mount operation is coming from the
+	// application, i.e. through mount(2). If InternalMount is true, allow the use
+	// of filesystem types for which RegisterFilesystemTypeOptions.AllowUserMount
+	// == false.
 	InternalMount bool
 }