From: Miklos Szeredi <miklos@szeredi.hu>
To: trond.myklebust@fys.uio.no
Cc: miklos@szeredi.hu, npiggin@suse.de, linux-nfs@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: Why doesn't zap_pte_range() call page_mkwrite()
Date: Fri, 24 Apr 2009 09:33:05 +0200 [thread overview]
Message-ID: <E1LxFuD-0008M9-1a@pomaz-ex.szeredi.hu> (raw)
In-Reply-To: <E1LxFd4-0008Ih-Rd@pomaz-ex.szeredi.hu> (message from Miklos Szeredi on Fri, 24 Apr 2009 09:15:22 +0200)
On Fri, 24 Apr 2009, Miklos Szeredi wrote:
> Hmm, I guess this is a bit nasty: the VM promises filesystems that
> ->page_mkwrite() will be called when the page is dirtied through a
> mapping, _almost_ all of the time. Except when munmap happens to race
> with clear_page_dirty_for_io().
>
> I don't have any ideas how this could be fixed, CC-ing linux-mm...
On second thought, we could possibly just ignore the dirty bit in that
case. Trying to write to a mapping _during_ munmap() will have pretty
undefined results, I don't think any sane application out there should
rely on the results of this.
But how knows, the world is a weird place...
Miklos
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next prev parent reply other threads:[~2009-04-24 7:32 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1240510668.11148.40.camel@heimdal.trondhjem.org>
[not found] ` <E1Lx4yU-0007A8-Gl@pomaz-ex.szeredi.hu>
[not found] ` <1240519320.5602.9.camel@heimdal.trondhjem.org>
2009-04-24 7:15 ` Miklos Szeredi
2009-04-24 7:33 ` Miklos Szeredi [this message]
2009-04-24 12:59 ` Chris Mason
2009-04-24 13:31 ` Trond Myklebust
2009-04-24 14:06 ` Trond Myklebust
2009-04-24 16:18 ` Jamie Lokier
2009-04-24 10:41 ` Robin Holt
2009-04-24 14:52 ` Miklos Szeredi
2009-04-24 17:00 ` Trond Myklebust
2009-04-25 5:10 ` Nick Piggin
2009-09-08 15:30 ` Chris Mason
2009-09-08 15:41 ` Nick Piggin
2009-09-08 16:31 ` Chris Mason
2009-09-08 17:00 ` Nick Piggin
2009-09-08 17:00 ` Nick Piggin
2009-09-08 15:41 ` Nick Piggin
2009-09-09 2:21 ` Christoph Hellwig
2009-09-09 2:21 ` Christoph Hellwig
2009-09-09 5:39 ` Nick Piggin
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