linux-kernel - Re: adding proper O_SYNC/O_DSYNC, was Re: O

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Message-ID: <20090830164411.GB7129@shareable.org>
Date:	Sun, 30 Aug 2009 17:44:11 +0100
From:	Jamie Lokier <jamie@...reable.org>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Ulrich Drepper <drepper@...hat.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org
Subject: Re: adding proper O_SYNC/O_DSYNC, was Re: O_DIRECT and barriers

Christoph Hellwig wrote:
> P.S. better naming suggestions for O_FULLSYNC welcome

O_FULLSYNC might get confused with MacOS X's F_FULLSYNC, which means
something else: fsync through hardware volatile write caches.

(Might we even want to provide O_FULLSYNC and O_FULLDATASYNC to mean
that, eventually?)

O_ISYNC is a bit misleading if we don't really offer "flush just the
inode state" by itself.

So it should at least start with underscores: __O_ISYNC.

How about __O_SYNC_NEW with

    #define O_SYNC     (O_DSYNC|__O_SYNC_NEW)

I think that tells people reading the headers a bit about what to
expect on older kernels too.

-- Jamie
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