memory leak when write in a file (with O_DIRECT flag).

[Vincent Cassi <cassi@vexcel.com>]

Hi,

  I have a small program that take a buffer and copy it in a file.
  If (and only if) the flag O_DIRECT is given to the open command, a
memory leak appeares.
  The /proc/meminfo file, show the free memory going down each time that
the program is running.

  The average of the memory leak is 160 kBytes with a buffer of 80 Meg
Bytes.
  The buffer is alligned and mlocked before the write.
  The system used: Mandrake: 8.2
                                   XFS: 2.0.0-1 mdk
                                   linux: 2.4.18

  What I'm doing wrong ???
  Thanks for any help.

  Vincent