bdflush(2) -- Linux man page
NAME
bdflush - start, flush, or tune buffer-dirty-flush daemon
SYNOPSIS
int bdflush(int func, long *address);
int bdflush(int func, long data);
DESCRIPTION
bdflush
starts, flushes, or tunes the buffer-dirty-flush daemon.
Only the super-user 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 legal ranges
are defined in the kernel source file
fs/buffer.c.
RETURN VALUE
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
- EPERM
-
Caller is not super-user.
- EFAULT
-
address
points outside your accessible address space.
- EBUSY
-
An attempt was made to enter the daemon code after
another process has already entered.
- EINVAL
-
An attempt was made to read or write an invalid parameter number,
or to write an invalid value to a parameter.
CONFORMING TO
bdflush is Linux specific and should not be used in programs
intended to be portable.
SEE ALSO
fsync(2),
sync(2),
update(8),
sync(8)
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