From: Yudong Gao <stgyd@umich.edu>
To: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: linux-nfs@vger.kernel.org
Subject: Re: Implementation of delegation
Date: Mon, 12 Jul 2010 15:19:26 -0700 [thread overview]
Message-ID: <AANLkTilKhiHmLdssHLhW4_0bzb15cJnvlAMhjC5akPVi@mail.gmail.com> (raw)
In-Reply-To: <1278972475.14605.9.camel-rJ7iovZKK19ZJLDQqaL3InhyD016LWXt@public.gmane.org>
I see! Thanks a lot for the pointer!
best,
Yudong
On Mon, Jul 12, 2010 at 3:07 PM, Trond Myklebust
<trond.myklebust@fys.uio.no> wrote:
> On Mon, 2010-07-12 at 15:00 -0700, Yudong Gao wrote:
>> Hi Trond,
>>
>> Thanks for the prompt reply!
>>
>> I find that in _nfs_do_open(), _nfs4_proc_open(), which do the RPC
>> call to the remote server, is always called before
>> nfs4_opendata_to_nfs4_state(), which will further invoke
>> nfs4_try_open_cached().
>>
>> Does this means that whenever is file is opened, the client always
>> need to talk to the server first?
>
> The actual RPC call is skipped if the call to can_open_cached() succeeds
> in nfs4_open_prepare(). In that case, we just grab the sequence, which
> ensures that we remain serialised w.r.t. CLOSE and OPEN_DOWNGRADE calls.
>
> Trond
>
>
prev parent reply other threads:[~2010-07-12 22:19 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-12 21:37 Implementation of delegation Yudong Gao
[not found] ` <AANLkTik1dbBEnyqMEw9snDhjglJiDQJKs4dFdenqXaGJ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-07-12 21:48 ` Trond Myklebust
[not found] ` <1278971292.14605.2.camel-rJ7iovZKK19ZJLDQqaL3InhyD016LWXt@public.gmane.org>
2010-07-12 22:00 ` Yudong Gao
2010-07-12 22:07 ` Trond Myklebust
[not found] ` <1278972475.14605.9.camel-rJ7iovZKK19ZJLDQqaL3InhyD016LWXt@public.gmane.org>
2010-07-12 22:19 ` Yudong Gao [this message]
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