From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Andrea Arcangeli <andrea@suse.de>
Cc: Andrew Morton <akpm@osdl.org>,
hugh@veritas.com, linux-kernel@vger.kernel.org
Subject: Re: smp race fix between invalidate_inode_pages* and do_no_page
Date: Sun, 02 Apr 2006 15:17:44 +1000 [thread overview]
Message-ID: <442F5E78.9010905@yahoo.com.au> (raw)
In-Reply-To: <20060331123622.GB18093@opteron.random>
Hi Andrea, seems good to me.
Andrea Arcangeli wrote:
> The PG_truncate is needed as well because we can't know in do_no_page if
> page->mapping is legitimate null or not (think bttv and other device
> drivers returning page->mapping null because they're private but not
> reserved pages etc..)
>
> From: Andrea Arcangeli <andrea@suse.de>
> Subject: avoid race between invalidate_inode_pages2 and do_no_page
>
> Use page lock and new bitflag to serialize.
>
As clean upstream solution, could we make truncatable (ie. regular
file backed) mappings set a vma flag which changes its nopage protocol
to return a locked page?
filemap_nopage itself, rather than do_no_page would then take care of
handling the truncate races. That seems to be a better layer to handle
it in.
Also, after this there should be no reason for truncate_count, right?
(At least in its truncate/nopage capacity.) If so, we should remove it
as part of the same patch / patchset.
--
SUSE Labs, Novell Inc.
Send instant messages to your online friends http://au.messenger.yahoo.com
next prev parent reply other threads:[~2006-04-02 9:00 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-13 19:37 smp race fix between invalidate_inode_pages* and do_no_page Andrea Arcangeli
2005-12-13 21:02 ` Andrew Morton
2005-12-13 21:14 ` Andrea Arcangeli
2005-12-16 13:51 ` Andrea Arcangeli
2006-01-10 6:24 ` Andrea Arcangeli
2006-01-10 6:48 ` Andrea Arcangeli
2006-01-11 4:08 ` Nick Piggin
2006-01-11 8:23 ` Andrea Arcangeli
2006-01-11 8:51 ` Andrew Morton
2006-01-11 9:02 ` Andrea Arcangeli
2006-01-11 9:06 ` Andrew Morton
2006-01-11 9:13 ` Andrea Arcangeli
2006-01-11 20:49 ` Hugh Dickins
2006-01-11 21:05 ` Andrew Morton
2006-01-13 7:35 ` Nick Piggin
2006-01-13 7:47 ` Andrew Morton
2006-01-13 10:37 ` Nick Piggin
2006-03-31 12:36 ` Andrea Arcangeli
2006-04-02 5:17 ` Nick Piggin [this message]
2006-04-02 5:21 ` Andrew Morton
2006-04-07 19:18 ` Hugh Dickins
2006-01-11 9:39 ` Nick Piggin
2006-01-11 9:34 ` Nick Piggin
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