Purpose of sync() function

[Frederic Giasson]

Hi all,

	I am working on a device driver for a flash chip that is not
currently supported by MTD current code.  My driver works fine, I am also
able to mount a jffs2 filesystem on it.  I have not implemented the sync()
function, because looking at others drivers it doest not seem to do anything
useful.  Can anyone tell me if I am right or wrong, and what should be the
purpose of the sync function^

Thanks in advance!

Frédéric Giasson