op: OP; int wait = 0 chdir, 0 chmod, 0 chown, 0 chroot, 0 close, 0 creat, 0 dup, 0 fchmod, 0 fchown, 0 fstat, 1 link, 0 mkdir, 0 mknod, 1 open, 0 rename, 0 stat, 1 unlink, 0 symlink, 0 exec, 0 may-unlink, 1 did-unlink, 0 cancel-unlink, 0 get-xattr, 1 list-xattr, 1 remove-xattr, 1 set-xattr, 0 create-xattr, 1 replace-xattr, 1