From: Andrew Morton <akpm@digeo.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [patch] 'virtual => physical page mappingcache',vcache-2.5.38-B8
Date: Fri, 27 Sep 2002 12:25:50 -0700 [thread overview]
Message-ID: <3D94B0BE.991E770@digeo.com> (raw)
In-Reply-To: 1033154186.16726.17.camel@irongate.swansea.linux.org.uk
Alan Cox wrote:
>
> On Fri, 2002-09-27 at 19:35, Andrew Morton wrote:
> > O_DIRECT writes operate under i_sem, which provides exclusion
> > from trucate. Do you know something which I don't??
>
> So it does, hidden away in generic_file_write rather than the lower
> layers.
Well that's sort of the same level at which truncate takes it.
It's a pretty big lock.
> Interesting. So now I have a new question to resolve, which is
> why doing O_DIRECT and truncate together corrupted my disk when I tried
> it trying to break stuff
Interesting indeed. Possibly invalidate_inode_pages2() accidentally
left some dirty buffers detached from the mapping. Hard to see how
it could do that.
What kernel were you testing?
next prev parent reply other threads:[~2002-09-27 19:20 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-27 16:24 [patch] 'virtual => physical page mapping cache', vcache-2.5.38-B8 Ingo Molnar
2002-09-27 16:26 ` Linus Torvalds
2002-09-27 16:42 ` Ingo Molnar
2002-09-27 16:47 ` Linus Torvalds
2002-09-27 17:01 ` Ingo Molnar
2002-09-27 17:05 ` Linus Torvalds
2002-09-27 17:33 ` Ingo Molnar
2002-09-27 17:32 ` Linus Torvalds
2002-09-27 17:42 ` Ingo Molnar
2002-09-27 17:48 ` Linus Torvalds
2002-09-27 18:54 ` [patch] 'virtual => physical page mapping cache' take #2, vcache-2.5.38-C4 Ingo Molnar
2002-09-27 19:12 ` Ingo Molnar
2002-10-15 5:15 ` Rusty Russell
2002-09-27 17:44 ` [patch] 'virtual => physical page mapping cache', vcache-2.5.38-B8 Ingo Molnar
2002-09-27 17:42 ` Chris Wedgwood
2002-09-27 17:53 ` Ingo Molnar
2002-09-27 17:59 ` Chris Wedgwood
2002-09-27 18:01 ` Alan Cox
2002-09-27 18:35 ` [patch] 'virtual => physical page mapping cache',vcache-2.5.38-B8 Andrew Morton
2002-09-27 19:16 ` Alan Cox
2002-09-27 19:25 ` Andrew Morton [this message]
2002-09-27 20:02 ` [patch] 'virtual => physical page mappingcache',vcache-2.5.38-B8 Alan Cox
2002-09-28 10:22 ` [patch] 'virtual => physical page mapping cache', vcache-2.5.38-B8 Arjan van de Ven
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