Add VFS2 plumbing for extended attributes.

PiperOrigin-RevId: 286281274

1 files changed, 25 insertions, 0 deletions

diff --git a/pkg/sentry/vfs/file_description_impl_util.go b/pkg/sentry/vfs/file_description_impl_util.go
index aae023254..3df49991c 100644
--- a/pkg/sentry/vfs/file_description_impl_util.go
+++ b/pkg/sentry/vfs/file_description_impl_util.go
@@ -127,6 +127,31 @@ func (FileDescriptionDefaultImpl) Ioctl(ctx context.Context, uio usermem.IO, arg
 	return 0, syserror.ENOTTY
 }
 
+// Listxattr implements FileDescriptionImpl.Listxattr analogously to
+// inode_operations::listxattr == NULL in Linux.
+func (FileDescriptionDefaultImpl) Listxattr(ctx context.Context) ([]string, error) {
+	// This isn't exactly accurate; see FileDescription.Listxattr.
+	return nil, syserror.ENOTSUP
+}
+
+// Getxattr implements FileDescriptionImpl.Getxattr analogously to
+// inode::i_opflags & IOP_XATTR == 0 in Linux.
+func (FileDescriptionDefaultImpl) Getxattr(ctx context.Context, name string) (string, error) {
+	return "", syserror.ENOTSUP
+}
+
+// Setxattr implements FileDescriptionImpl.Setxattr analogously to
+// inode::i_opflags & IOP_XATTR == 0 in Linux.
+func (FileDescriptionDefaultImpl) Setxattr(ctx context.Context, opts SetxattrOptions) error {
+	return syserror.ENOTSUP
+}
+
+// Removexattr implements FileDescriptionImpl.Removexattr analogously to
+// inode::i_opflags & IOP_XATTR == 0 in Linux.
+func (FileDescriptionDefaultImpl) Removexattr(ctx context.Context, name string) error {
+	return syserror.ENOTSUP
+}
+
 // DirectoryFileDescriptionDefaultImpl may be embedded by implementations of
 // FileDescriptionImpl that always represent directories to obtain
 // implementations of non-directory I/O methods that return EISDIR.