From: dai.ngo@oracle.com
To: "J. Bruce Fields" <bfields@fieldses.org>
Cc: chuck.lever@oracle.com, linux-nfs@vger.kernel.org,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH v3 2/3] nfsd: Initial implementation of NFSv4 Courteous Server
Date: Fri, 24 Sep 2021 13:53:13 -0700 [thread overview]
Message-ID: <d0029c41-a686-3491-3249-1780d5586494@oracle.com> (raw)
In-Reply-To: <20210923193239.GD18334@fieldses.org>
On 9/23/21 12:32 PM, J. Bruce Fields wrote:
> On Thu, Sep 23, 2021 at 10:09:35AM -0700, dai.ngo@oracle.com wrote:
>> On 9/22/21 6:34 PM, J. Bruce Fields wrote:
>>> On Thu, Sep 16, 2021 at 02:22:11PM -0400, Dai Ngo wrote:
>>>> +/*
>>>> + * If the conflict happens due to a NFSv4 request then check for
>>>> + * courtesy client and set rq_conflict_client so that upper layer
>>>> + * can destroy the conflict client and retry the call.
>>>> + */
>>> I think we need a different approach.
>> I think nfsd_check_courtesy_client is used to handle conflict with
>> delegation. So instead of using rq_conflict_client to let the caller
>> knows and destroy the courtesy client as the current patch does, we
>> can ask the laundromat thread to do the destroy.
> I can't see right now why that wouldn't work.
>
>> In that case,
>> nfs4_get_vfs_file in nfsd4_process_open2 will either return no error
>> since the the laufromat destroyed the courtesy client or it gets
>> get nfserr_jukebox which causes the NFS client to retry. By the time
>> the retry comes the courtesy client should already be destroyed.
> Make sure this works for local (non-NFS) lease breakers as well. I
> think that mainly means making sure the !O_NONBLOCK case of
> __break_lease works.
Yes, local lease breakers use (!O_NONBLOCK). In this case __break_lease
will call lm_break then wait for all lease conflicts to be resolved
before returning to caller.
-Dai
>
> --b.
next prev parent reply other threads:[~2021-09-24 20:53 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-16 18:22 [PATCH RFC v3 0/2] nfsd: Initial implementation of NFSv4 Courteous Server Dai Ngo
2021-09-16 18:22 ` [PATCH v3 1/3] fs/lock: add new callback, lm_expire_lock, to lock_manager_operations Dai Ngo
2021-09-16 18:22 ` [PATCH v3 2/3] nfsd: Initial implementation of NFSv4 Courteous Server Dai Ngo
2021-09-22 21:14 ` J. Bruce Fields
2021-09-22 22:16 ` dai.ngo
2021-09-23 1:18 ` J. Bruce Fields
2021-09-23 17:09 ` dai.ngo
2021-09-23 1:34 ` J. Bruce Fields
2021-09-23 17:09 ` dai.ngo
2021-09-23 19:32 ` J. Bruce Fields
2021-09-24 20:53 ` dai.ngo [this message]
2021-09-16 18:22 ` [PATCH v3 3/3] nfsd: back channel stuck in SEQ4_STATUS_CB_PATH_DOWN Dai Ngo
2021-09-16 19:00 ` Chuck Lever III
2021-09-16 19:55 ` Bruce Fields
2021-09-16 20:15 ` dai.ngo
2021-09-17 18:23 ` dai.ngo
2021-09-23 1:47 ` [PATCH RFC v3 0/2] nfsd: Initial implementation of NFSv4 Courteous Server J. Bruce Fields
2021-09-23 17:15 ` dai.ngo
2021-09-23 19:37 ` dai.ngo
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