From: Chris Wedgwood <cw@f00f.org>
To: Stephen Lord <lord@sgi.com>
Cc: Jeff Garzik <garzik@havoc.gtf.org>, Chris Mason <mason@suse.com>,
Andrea Arcangeli <andrea@suse.de>,
Andrew Morton <akpm@zip.com.au>, Ricardo Galli <gallir@uib.es>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: O_DIRECT fails in some kernel and FS
Date: Sun, 3 Feb 2002 06:09:26 -0800 [thread overview]
Message-ID: <20020203140926.GA14532@tapu.f00f.org> (raw)
In-Reply-To: <E16WkQj-0005By-00@antoli.uib.es> <3C5AFE2D.95A3C02E@zip.com.au> <1012597538.26363.443.camel@jen.americas.sgi.com> <20020202093554.GA7207@tapu.f00f.org> <234710000.1012674008@tiny> <20020202205438.D3807@athlon.random> <242700000.1012680610@tiny> <3C5C4929.5080403@sgi.com> <20020202155028.B26147@havoc.gtf.org> <3C5D3DE9.4080503@sgi.com>
In-Reply-To: <3C5D3DE9.4080503@sgi.com>
On Sun, Feb 03, 2002 at 07:40:57AM -0600, Stephen Lord wrote:
What we had were two flags, one which indicated use direct I/O,
and another which indicated return an error to user space rather
than go through buffers. So lie to me and make it work, or don't
lie to me options I suppose.
This seems way to complex in the case of reiserfs... you're only going
to see tails for small files (typically under 16k) and for the tail
part when less than a block.
Since O_DIRECT much be blocked sized and block aligned, I'm not sure
if this is a problem at present...
I suspect the reason XFS never did small files in the inode was
because of the problems with implementing mmap and O_DIRECT.
How does IRIX deal with O_DIRECT read/writes of a mapped area?
Invalidate them or just accept things as being incoherent?
--cw
next prev parent reply other threads:[~2002-02-03 14:11 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-02-01 20:37 O_DIRECT fails in some kernel and FS Ricardo Galli
2002-02-01 20:44 ` Andrew Morton
2002-02-01 20:49 ` Ricardo Galli
2002-02-01 20:57 ` Andrew Morton
2002-02-01 21:05 ` Steve Lord
2002-02-02 9:35 ` Chris Wedgwood
2002-02-02 10:25 ` Hans Reiser
2002-02-02 15:24 ` Chris Mason
2002-02-02 18:20 ` Chris Mason
2002-02-02 19:54 ` Andrea Arcangeli
2002-02-02 20:10 ` Chris Mason
2002-02-02 20:16 ` Stephen Lord
2002-02-02 20:50 ` Jeff Garzik
2002-02-03 13:40 ` Stephen Lord
2002-02-03 14:09 ` Chris Wedgwood [this message]
2002-02-03 15:05 ` Stephen Lord
2002-02-03 22:44 ` Chris Wedgwood
2002-02-04 15:04 ` Jeff Garzik
2002-02-04 15:21 ` Chris Mason
2002-02-04 15:15 ` Steve Lord
2002-02-04 15:46 ` Alan Cox
2002-02-04 16:02 ` Steve Lord
2002-02-04 18:22 ` Daniel Phillips
2002-02-04 19:11 ` Steve Lord
2002-02-04 18:29 ` Joel Becker
2002-02-04 18:49 ` Jeff Garzik
2002-02-04 18:55 ` Joel Becker
2002-02-04 19:16 ` Jeff Garzik
2002-02-02 17:14 ` Christoph Hellwig
[not found] <E16WkQj-0005By-00@antoli.uib.es.suse.lists.linux.kernel>
[not found] ` <3C5AFE2D.95A3C02E@zip.com.au.suse.lists.linux.kernel>
[not found] ` <1012597538.26363.443.camel@jen.americas.sgi.com.suse.lists.linux.kernel>
[not found] ` <20020202093554.GA7207@tapu.f00f.org.suse.lists.linux.kernel>
[not found] ` <234710000.1012674008@tiny.suse.lists.linux.kernel>
[not found] ` <20020202205438.D3807@athlon.random.suse.lists.linux.kernel>
[not found] ` <242700000.1012680610@tiny.suse.lists.linux.kernel>
[not found] ` <3C5C4929.5080403@sgi.com.suse.lists.linux.kernel>
[not found] ` <20020202155028.B26147@havoc.gtf.org.suse.lists.linux.kernel>
2002-02-03 7:26 ` Andi Kleen
2002-02-04 15:13 ` Jeff Garzik
2002-02-04 15:31 ` Chris Mason
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