linux-kernel - Re: [PATCH 2/7] ext3: call blkdev_issue

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20090331111818.GL5178@kernel.dk>
Date:	Tue, 31 Mar 2009 13:18:18 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Theodore Tso <tytso@....edu>, Chris Mason <chris.mason@...cle.com>,
	Fernando Luis Vázquez Cao 
	<fernando@....ntt.co.jp>, Jeff Garzik <jeff@...zik.org>,
	Christoph Hellwig <hch@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arjan van de Ven <arjan@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <npiggin@...e.de>, David Rees <drees76@...il.com>,
	Jesper Krogh <jesper@...gh.cc>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	david@...morbit.com
Subject: Re: [PATCH 2/7] ext3: call blkdev_issue_flush() on fsync()

On Tue, Mar 31 2009, Tejun Heo wrote:
> Hello,
> 
> Theodore Tso wrote:
> > On Mon, Mar 30, 2009 at 10:15:51AM -0400, Chris Mason wrote:
> >> I'm not sure we want to stick Fernando with changing how barriers are
> >> done in individual filesystems, his patch is just changing the existing
> >> call points.
> > 
> > Well, his patch actually added some calls to block_issue_flush().  But
> > yes, it's probably better if he just changes the existing call points,
> > and we can have the relevant filesystem maintainers double check to
> > make sure that there aren't any new call points which are needed.
> 
> How about having something like blk_ensure_cache_flushed() which
> issues flush iff there hasn't been any write since the last flush?
> It'll be easy to implement and will filter out duplicate flushes in
> most cases.

My original ide implementation of flushes actually did this. My memory
is a little hazy on why it was dropped, I'm guessing because it
basically never triggered anyway.

-- 
Jens Axboe

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/