Seth Woolley's Man Viewer

bdflush(2) - bdflush, bdflush - start, flush, or tune buffer-dirty-flush daemon - man 2 bdflush

([section] manual, -k keyword, -K [section] search, -f whatis)
man plain no title

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

       bdflush - start, flush(8,n), or tune buffer-dirty-flush daemon

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

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

       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(1,8) 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

       The set(7,n,1 builtins) of parameters, their values, and their legal ranges are defined
       in(1,8) the kernel source file(1,n) fs/buffer.c.

       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(7,n,1 builtins) to indicate the error.

       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(2,n,1 builtins) or write(1,2) an invalid  parameter  num-
              ber, or to write(1,2) an invalid value to a parameter.

       EPERM  Caller does not have the CAP_SYS_ADMIN capability.

       bdflush  is  Linux specific and should not be used in(1,8) programs intended
       to be portable.

       fsync(2), sync(1,2,8)(2), sync(1,2,8)(8), update(7,n)(8)

Linux 2.6.7                       2004-06-17                        BDFLUSH(2)

References for this manual (incoming links)