linux-kernel - Re: [PATCH v3] NFSv4: try lease recovery on NFS4ERR

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Date:   Tue, 28 Jan 2020 15:44:00 +0000
From:   Trond Myklebust <trondmy@...merspace.com>
To:     "linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
        "rmilkowski@...il.com" <rmilkowski@...il.com>
CC:     "anna.schumaker@...app.com" <anna.schumaker@...app.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "chuck.lever@...cle.com" <chuck.lever@...cle.com>
Subject: Re: [PATCH v3] NFSv4: try lease recovery on NFS4ERR_EXPIRED

On Tue, 2020-01-28 at 08:37 +0000, Robert Milkowski wrote:
> From: Robert Milkowski <rmilkowski@...il.com>
> 
> Currently, if an nfs server returns NFS4ERR_EXPIRED to open(),
> we return EIO to applications without even trying to recover.
> 
> Fixes: 272289a3df72 ("NFSv4: nfs4_do_handle_exception() handle
> revoke/expiry of a single stateid")
> Signed-off-by: Robert Milkowski <rmilkowski@...il.com>
> ---
>  fs/nfs/nfs4proc.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
> index 76d3716..b7c4044 100644
> --- a/fs/nfs/nfs4proc.c
> +++ b/fs/nfs/nfs4proc.c
> @@ -3187,6 +3187,11 @@ static struct nfs4_state *nfs4_do_open(struct
> inode *dir,
>  			exception.retry = 1;
>  			continue;
>  		}
> +		if (status == -NFS4ERR_EXPIRED) {
> +			nfs4_schedule_lease_recovery(server-
> >nfs_client);
> +			exception.retry = 1;
> +			continue;
> +		}
>  		if (status == -EAGAIN) {
>  			/* We must have found a delegation */
>  			exception.retry = 1;

Looks good.

Reviewed-by: Trond Myklebust <trond.myklebust@...merspace.com>

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