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From: Trond Myklebust <trondmy@hammerspace.com>
To: "linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>,
	"schumaker.anna@gmail.com" <schumaker.anna@gmail.com>
Cc: "Anna.Schumaker@Netapp.com" <Anna.Schumaker@Netapp.com>
Subject: Re: [PATCH 4/6] NFS: Have nfs41_proc_reclaim_complete() call nfs4_call_sync_custom()
Date: Mon, 19 Aug 2019 19:56:32 +0000	[thread overview]
Message-ID: <8bd34fcbd352a2d5c4a8c757919f044bfaa76c60.camel@hammerspace.com> (raw)
In-Reply-To: <20190819192900.19312-5-Anna.Schumaker@Netapp.com>

On Mon, 2019-08-19 at 15:28 -0400, schumaker.anna@gmail.com wrote:
> From: Anna Schumaker <Anna.Schumaker@Netapp.com>
> 
> An async call followed by an rpc_wait_for_completion() is basically
> the
> same as a synchronous call, so we can use nfs4_call_sync_custom() to
> keep our custom callback ops and the RPC_TASK_NO_ROUND_ROBIN flag.
> 
> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
> ---
>  fs/nfs/nfs4proc.c | 13 ++-----------
>  1 file changed, 2 insertions(+), 11 deletions(-)
> 
> diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
> index de2b3fd806ef..1b7863ec12d3 100644
> --- a/fs/nfs/nfs4proc.c
> +++ b/fs/nfs/nfs4proc.c
> @@ -8857,7 +8857,6 @@ static int nfs41_proc_reclaim_complete(struct
> nfs_client *clp,
>  		const struct cred *cred)
>  {
>  	struct nfs4_reclaim_complete_data *calldata;
> -	struct rpc_task *task;
>  	struct rpc_message msg = {
>  		.rpc_proc =
> &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
>  		.rpc_cred = cred,
> @@ -8866,7 +8865,7 @@ static int nfs41_proc_reclaim_complete(struct
> nfs_client *clp,
>  		.rpc_client = clp->cl_rpcclient,
>  		.rpc_message = &msg,
>  		.callback_ops = &nfs4_reclaim_complete_call_ops,
> -		.flags = RPC_TASK_ASYNC | RPC_TASK_NO_ROUND_ROBIN,
> +		.flags = RPC_TASK_NO_ROUND_ROBIN,
>  	};
>  	int status = -ENOMEM;
>  
> @@ -8881,15 +8880,7 @@ static int nfs41_proc_reclaim_complete(struct
> nfs_client *clp,
>  	msg.rpc_argp = &calldata->arg;
>  	msg.rpc_resp = &calldata->res;
>  	task_setup_data.callback_data = calldata;
> -	task = rpc_run_task(&task_setup_data);
> -	if (IS_ERR(task)) {
> -		status = PTR_ERR(task);
> -		goto out;
> -	}
> -	status = rpc_wait_for_completion_task(task);
> -	if (status == 0)
> -		status = task->tk_status;
> -	rpc_put_task(task);
> +	status = nfs4_call_sync_custom(&task_setup_data);
>  out:
>  	dprintk("<-- %s status=%d\n", __func__, status);
>  	return status;

Hmm... I'm a little confused. Why does RECLAIM_COMPLETE need
RPC_TASK_NO_ROUND_ROBIN? It should be ordered so it is called after
BIND_CONN_TO_SESSION in nfs4_state_manager(), so in principle it is
supposed to be able to recover from an error like
NFS4ERR_CONN_NOT_BOUND_TO_SESSION. Are there other situations where we
need RPC_TASK_NO_ROUND_ROBIN?

-- 
Trond Myklebust
Linux NFS client maintainer, Hammerspace
trond.myklebust@hammerspace.com



  reply	other threads:[~2019-08-19 19:56 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-19 19:28 [PATCH 0/6] NFS: Add an nfs4_call_sync_custom() function schumaker.anna
2019-08-19 19:28 ` [PATCH 1/6] " schumaker.anna
2019-08-19 19:28 ` [PATCH 2/6] NFS: Have nfs4_proc_setclientid() call nfs4_call_sync_custom() schumaker.anna
2019-08-19 19:28 ` [PATCH 3/6] NFS: Have _nfs4_proc_secinfo() " schumaker.anna
2019-08-19 19:28 ` [PATCH 4/6] NFS: Have nfs41_proc_reclaim_complete() " schumaker.anna
2019-08-19 19:56   ` Trond Myklebust [this message]
2019-08-19 20:02     ` Anna Schumaker
2019-09-02  1:11     ` NeilBrown
2019-09-02 16:54       ` Trond Myklebust
2019-09-03  2:07         ` NeilBrown
2019-08-19 19:28 ` [PATCH 5/6] NFS: Have nfs41_proc_secinfo_no_name() " schumaker.anna
2019-08-19 19:29 ` [PATCH 6/6] NFS: Have nfs4_proc_get_lease_time() " schumaker.anna

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