From: "Pekka Enberg" <penberg@cs.helsinki.fi>
To: "Hugh Dickins" <hugh@veritas.com>
Cc: "Erez Zadok" <ezk@cs.sunysb.edu>, "Ryan Finnie" <ryan@finnie.org>,
"Andrew Morton" <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
cjwatson@ubuntu.com, linux-mm@kvack.org
Subject: Re: msync(2) bug(?), returns AOP_WRITEPAGE_ACTIVATE to userland
Date: Mon, 22 Oct 2007 23:40:14 +0300 [thread overview]
Message-ID: <84144f020710221340n6586b6d6web28cea481809b93@mail.gmail.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0710222042500.23513@blonde.wat.veritas.com>
Hi Hugh,
On 10/22/07, Hugh Dickins <hugh@veritas.com> wrote:
> I don't disagree with your unionfs_writepages patch, Pekka, but I think
> it should be viewed as an optimization (don't waste time trying to write
> a group of pages when we know that nothing will be done) rather than as
> essential.
Ok, so tmpfs needs your fix still.
On 10/22/07, Hugh Dickins <hugh@veritas.com> wrote:
> > So now I wonder if we still need the patch to prevent AOP_WRITEPAGE_ACTIVATE
> > from being returned to userland. I guess we still need it, b/c even with
> > your patch, generic_writepages() can return AOP_WRITEPAGE_ACTIVATE back to
> > the VFS and we need to ensure that doesn't "leak" outside the kernel.
>
> Can it now? Current git has a patch from Andrew which bears a striking
> resemblance to that from Pekka, stopping the leak from write_cache_pages.
I don't think it can, it looks ok now.
Pekka
next prev parent reply other threads:[~2007-10-22 20:40 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-07 19:20 msync(2) bug(?), returns AOP_WRITEPAGE_ACTIVATE to userland Erez Zadok
2007-10-11 21:47 ` Andrew Morton
2007-10-11 22:12 ` Ryan Finnie
2007-10-12 0:38 ` Hugh Dickins
2007-10-12 21:45 ` Pekka Enberg
2007-10-14 8:44 ` Hugh Dickins
2007-10-14 17:09 ` Pekka Enberg
2007-10-14 17:23 ` Erez Zadok
2007-10-14 17:50 ` Pekka J Enberg
2007-10-14 22:32 ` Erez Zadok
2007-10-15 11:47 ` Pekka Enberg
2007-10-16 18:02 ` Erez Zadok
2007-10-22 20:16 ` Hugh Dickins
2007-10-22 20:48 ` Pekka Enberg
2007-10-25 15:36 ` Hugh Dickins
2007-10-25 16:44 ` Erez Zadok
2007-10-25 18:23 ` Hugh Dickins
2007-10-26 2:00 ` Neil Brown
2007-10-26 8:09 ` Pekka Enberg
2007-10-26 11:26 ` Hugh Dickins
2007-10-26 8:05 ` Pekka Enberg
2007-10-22 21:04 ` Erez Zadok
2007-10-25 16:40 ` Hugh Dickins
2007-10-24 21:02 ` [PATCH] fix tmpfs BUG and AOP_WRITEPAGE_ACTIVATE Hugh Dickins
2007-10-24 21:08 ` Andrew Morton
2007-10-24 21:37 ` [PATCH+comment] " Hugh Dickins
2007-10-25 5:37 ` Pekka Enberg
2007-10-25 6:30 ` Hugh Dickins
2007-10-25 7:24 ` Pekka Enberg
2007-10-25 16:01 ` Erez Zadok
2007-10-25 20:51 ` H. Peter Anvin
2007-10-22 20:01 ` msync(2) bug(?), returns AOP_WRITEPAGE_ACTIVATE to userland Hugh Dickins
2007-10-22 20:40 ` Pekka Enberg [this message]
2007-10-22 19:42 ` Hugh Dickins
2007-10-22 21:38 ` Erez Zadok
2007-10-25 18:03 ` Hugh Dickins
2007-10-27 20:47 ` Erez Zadok
2007-10-28 20:23 ` Erez Zadok
2007-10-29 20:33 ` Hugh Dickins
2007-10-31 23:53 ` Erez Zadok
2007-11-05 15:40 ` Hugh Dickins
2007-11-05 16:38 ` Dave Hansen
2007-11-05 18:57 ` Hugh Dickins
2007-11-09 2:47 ` Erez Zadok
2007-11-09 6:05 ` Erez Zadok
2007-11-12 5:41 ` Hugh Dickins
2007-11-12 17:01 ` Hugh Dickins
2007-11-13 10:18 ` Erez Zadok
2007-11-17 21:24 ` Hugh Dickins
2007-11-20 1:30 ` Erez Zadok
-- strict thread matches above, loose matches on Subject: below --
2007-10-07 19:58 Pekka J Enberg
2007-10-08 1:58 ` Ryan Finnie
2007-10-08 11:18 ` Pekka Enberg
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