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Date: Tue, 18 May 2004 16:18:57 -0700 (PDT)
From: Julian Elischer <julian@elischer.org>
To: Don Lewis <truckman@FreeBSD.org>
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cc: Nikita@Namesys.COM
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Subject: Re: QMail and SoftUpdates
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On Tue, 18 May 2004, Don Lewis wrote:

> On 18 May, Julian Elischer wrote:
> > 
> > 
[...]

> > 
> > An fsync will sync ALL directory entries pointing to the file
> 
> I haven't looked at how qmail works, but my suspicion is that it
> fsync()s the file and then creates a link (and probably unlinks the old
> name) to mark the queue file as valid and is not partially written. I
> think this would work with softupdates if the file were fsync()ed again
> after the link() call.  I won't comment about why this change is
> unlikely to make it into the code.

a single fsync AFTER the link 
but before acking the mail would be sufficient.