FS_INTERNAL
if (fs->fs_flags & ~(FS_KNOWN_FLAGS | FS_INTERNAL)) {
fs->fs_flags = fs->fs_old_flags | (fs->fs_flags & FS_INTERNAL);
bfs->fs_flags &= ~FS_INTERNAL;
if (fs->fs_flags & ~(FS_KNOWN_FLAGS | FS_INTERNAL)) {
saveflag = fs->fs_flags & FS_INTERNAL;
fs->fs_flags &= ~FS_INTERNAL;