linux-kernel - Re: Linux 2.6.29

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Message-ID: <49CB1F90.3090501@garzik.org>
Date:	Thu, 26 Mar 2009 02:24:16 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Kyle Moffett <kyle@...fetthome.net>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Theodore Tso <tytso@....edu>,
	Christoph Hellwig <hch@...radead.org>, Jan Kara <jack@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arjan van de Ven <arjan@...radead.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <npiggin@...e.de>,
	Jens Axboe <jens.axboe@...cle.com>,
	David Rees <drees76@...il.com>, Jesper Krogh <jesper@...gh.cc>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.29

Kyle Moffett wrote:
> Really, I think virtually all of the database programs would be
> perfectly happy with an "fsbarrier(fd, flags)" syscall, where if "fd"
> points to a regular file or directory then it instructs the underlying
> filesystem to do whatever internal barrier it supports, and if not
> just fail with -ENOTSUPP (so you can fall back to fdatasync(), etc).
> Perhaps "flags" would allow a "data" or "metadata" barrier, but if not
> it's not a big issue.

If you want a per-fd barrier call, there is always sync_file_range(2)


> If a user-level tool needs to enforce ordering
> between IOs the only tool right now is is a full flush

or sync_file_range(2)...

	Jeff



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