Re: msync() behaviour broken for MS_ASYNC, revert patch?

[Stephen C. Tweedie]

Hi,

On Wed, 2004-04-21 at 03:10, Jamie Lokier wrote:

> msync(0) has always had behaviour consistent with the <=2.4.9 and
> >=2.5.68 MS_ASYNC behaviour, is that right?

Not sure about "always", but it looks like it recently at least.  2.2
msync was implemented very differently but seems, from the source, to
have the same property --- do_write_page() calls f_op->write() on msync,
and MS_SYNC forces an fsync after the writes.  But 2.4 and 2.6 share
much more similar code to each other.  So all since 2.2 seem to do the
fully-async, deferred writeback behaviour for flags==0.

--Stephen

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