NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | CONFORMING TO | SEE ALSO | COLOPHON

BDFLUSH(2)                Linux Programmer's Manual               BDFLUSH(2)

NAME         top

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

SYNOPSIS         top

       #include <sys/kdaemon.h>

       int bdflush(int func, long *address);
       int bdflush(int func, long data);

DESCRIPTION         top

       Note: Since Linux 2.6, this system call is deprecated and does
       nothing.  It is likely to disappear altogether in a future kernel
       release.  Nowadays, the task performed by bdflush() is handled by the
       kernel pdflush thread.

       bdflush() starts, flushes, or tunes the buffer-dirty-flush daemon.
       Only a privileged process (one with the CAP_SYS_ADMIN capability) may
       call bdflush().

       If func is negative or 0, and no daemon has been started, then
       bdflush() enters the daemon code and never returns.

       If func is 1, some dirty buffers are written to disk.

       If func is 2 or more and is even (low bit is 0), then address is the
       address of a long word, and the tuning parameter numbered (func-2)/2
       is returned to the caller in that address.

       If func is 3 or more and is odd (low bit is 1), then data is a long
       word, and the kernel sets tuning parameter numbered (func-3)/2 to
       that value.

       The set of parameters, their values, and their valid ranges are
       defined in the Linux kernel source file fs/buffer.c.

RETURN VALUE         top

       If func is negative or 0 and the daemon successfully starts,
       bdflush() never returns.  Otherwise, the return value is 0 on success
       and -1 on failure, with errno set to indicate the error.

ERRORS         top

       EBUSY  An attempt was made to enter the daemon code after another
              process has already entered.

       EFAULT address points outside your accessible address space.

       EINVAL An attempt was made to read or write an invalid parameter
              number, or to write an invalid value to a parameter.

       EPERM  Caller does not have the CAP_SYS_ADMIN capability.

VERSIONS         top

       Since version 2.23, glibc no longer supports this obsolete system
       call.

CONFORMING TO         top

       bdflush() is Linux-specific and should not be used in programs
       intended to be portable.

SEE ALSO         top

       sync(1), fsync(2), sync(2)

COLOPHON         top

       This page is part of release 4.14 of the Linux man-pages project.  A
       description of the project, information about reporting bugs, and the
       latest version of this page, can be found at
       https://www.kernel.org/doc/man-pages/.

Linux                            2016-10-08                       BDFLUSH(2)

Pages that refer to this page: fsync(2)syscalls(2)capabilities(7)