From: Jeff Layton <jlayton@redhat.com>
To: Dave Chinner <david@fromorbit.com>
Cc: Steve French <smfrench@gmail.com>,
linux-cifs@vger.kernel.org,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Mingming Cao <mcao@us.ibm.com>
Subject: Re: stable page writes: wait_on_page_writeback and packet signing
Date: Wed, 9 Mar 2011 18:45:42 -0500 [thread overview]
Message-ID: <20110309184542.07c5ffe6@corrin.poochiereds.net> (raw)
In-Reply-To: <20110309215148.GW15097@dastard>
On Thu, 10 Mar 2011 08:51:48 +1100
Dave Chinner <david@fromorbit.com> wrote:
>
> Sounds like a case for the same dirty page lifecycle as NFS: clean
> -> dirty -> writeback -> unstable -> clean. i.e. the page is
> unstable after the issuing of the IO until the response from the
> server so the page can't be reclaimed while the IO is still in
> progress at the server...
>
It's a little more complicated than that for NFS. Unstable pages are
ones that have had successful writes but that have not been committed
yet. Once a NFS COMMIT call completes, the page is marked clean and can
be freed by the VM.
Actual writeback in NFS is pretty similar to other filesystems -- the
page is only under writeback until the WRITE response is received. It
just doesn't clear the dirty bit until a COMMIT response is received.
That said, an unstable write model for CIFS is not a bad idea. Just
substitute a SMB_COM_FLUSH for a NFS COMMIT call...
--
Jeff Layton <jlayton@redhat.com>
next prev parent reply other threads:[~2011-03-09 23:45 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-09 19:44 stable page writes: wait_on_page_writeback and packet signing Steve French
[not found] ` <AANLkTinFx9KGKDWSdUvFSvT4S6f9QjBzX=6Uo17oO89+-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-03-09 21:51 ` Dave Chinner
2011-03-09 21:58 ` Chris Mason
2011-03-09 22:13 ` Steve French
[not found] ` <AANLkTikK8MOm-m9XsOA4YGRe=E9bJTDh4iEYXtZumNmv-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-03-10 12:26 ` Chris Mason
2011-03-10 13:16 ` Jeff Layton
[not found] ` <20110310081638.0f8275d4-xSBYVWDuneFaJnirhKH9O4GKTjYczspe@public.gmane.org>
2011-03-10 13:32 ` Chris Mason
2011-03-10 13:47 ` Jeff Layton
[not found] ` <20110310084724.658fe5d7-xSBYVWDuneFaJnirhKH9O4GKTjYczspe@public.gmane.org>
2011-03-10 13:58 ` Chris Mason
2011-03-11 12:11 ` Jeff Layton
[not found] ` <20110311071143.01b407b6-9yPaYZwiELC+kQycOl6kW4xkIHaj4LzF@public.gmane.org>
2011-03-11 12:56 ` Chris Mason
2011-03-11 13:42 ` Jeff Layton
[not found] ` <20110311084221.4ac6bd11-9yPaYZwiELC+kQycOl6kW4xkIHaj4LzF@public.gmane.org>
2011-03-11 16:00 ` Chris Mason
2011-03-09 23:46 ` Dave Chinner
2011-03-09 22:01 ` Steve French
2011-03-09 23:54 ` Jeff Layton
[not found] ` <20110309185427.7858c29b-4QP7MXygkU+dMjc06nkz3ljfA9RmPOcC@public.gmane.org>
2011-03-10 0:33 ` Steve French
[not found] ` <AANLkTi=pXHjE6tNMm0_nO=Cn3nGH8oZ6Xhm1STh8x1Xe-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-03-10 1:30 ` Jeff Layton
2011-03-10 13:53 ` Steve French
[not found] ` <20110309203044.4fd0498e-4QP7MXygkU+dMjc06nkz3ljfA9RmPOcC@public.gmane.org>
2011-03-11 11:53 ` Jeff Layton
[not found] ` <AANLkTinDmqah6pQnHugoVxh-gDq+6+MDMuh-TyVAQ7LP-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-03-10 1:41 ` Trond Myklebust
[not found] ` <1299721264.2976.3.camel-rJ7iovZKK19ZJLDQqaL3InhyD016LWXt@public.gmane.org>
2011-03-10 7:34 ` Christoph Hellwig
2011-03-10 13:44 ` Steve French
2011-03-09 23:45 ` Jeff Layton [this message]
2011-03-10 2:12 ` Jeff Layton
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