add 4 io

hc

2023-08-21 ef9e1ccebba20d2e3859126411166909a383f483

1
2
# From http://brick.kernel.dk/snaps/MD5SUMS
md5    9a6ca62330c8adb0b6a4ea6cf8a55694    blktrace-1.1.0.tar.gz