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Date: Mon, 31 Mar 2003 19:25:46 -0800 (PST)
From: Kenny Simpson <theonetruekenny@yahoo.com>
Subject: Re: mmap-related questions
To: Benjamin LaHaise <bcrl@redhat.com>
Cc: linux-kernel@vger.kernel.org
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--- Benjamin LaHaise <bcrl@redhat.com> wrote:
> No.  You must use msync().

> Note that fsync() after
> munmap() will flush the 
> pages to disk under Linux.
Sweet!  Paydirt!  Is this documented/guaranteed to
continue to work for a while?
Is this true for all non-mmap()ed dirty buffers for a
given file?

Just to restate what you said:
- if part of a file is mmap()ed, msync() MUST be used
to sync it.
- any non-mmap()ed portions are synched with fsync().

I'm assuming this is a per-process thing.  i.e. The
above is true regardless of what other processes are
doing (e.g. even if another process has the same file
mmap()'d, I don't care).

> 2.4.7 is way out of date and should be updated for
> the numerous bugfixes and 
> security errata.
I know.  Unfortunately not my call.  Desperately
trying to beat people with clue sticks....

Thanks!,
-Kenny

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