bdflush(2)                    System Calls Manual                   bdflush(2)

NAME
       bdflush - start, flush, or tune buffer-dirty-flush daemon

SYNOPSIS
       #include <sys/kdaemon.h>

       int bdflush(int func, long data);

DESCRIPTION
       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)

STANDARDS
       Linux.

HISTORY
       This system call was introduced in Linux 1.1.3, became effectively
       obsolete in Linux 1.3.50, mostly useless in Linux 2.3.23, entirely
       useless in Linux 2.5.12, officially deprecated in Linux 2.5.52, and
       removed outright in Linux 5.15.

       Sometimes, if func was even, data actually represented a pointer.

       The header and prototype were removed in glibc 2.23.

SEE ALSO
       sync(1), fsync(2), sync(2)

Linux man-pages 6.14              2025-05-06                        bdflush(2)