bdflush2
Start, flush, or tune buffer-dirty-flush daemon
Usage
#include <sys/kdaemon.h>
int bdflush(int func, long data);
Overview
This system call used to turn the calling process into the bdflush daemon, or tune it, or flush the "old buffers". It then progressively lost all of that functionality.
See fs/buffer.c in the kernel version you're interested in to see what it actually does there.
Errors
ENOSYS (this system call is unimplemented)
Releases
19 releases since Debian 1.1 (Buzz); the text changed 15 times.