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

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Message-ID: <000601d5d5b6$39065c60$ab131520$@gmail.com>
Date:   Tue, 28 Jan 2020 08:37:47 -0000
From:   "Robert Milkowski" <rmilkowski@...il.com>
To:     <linux-nfs@...r.kernel.org>,
        "'Trond Myklebust'" <trondmy@...merspace.com>
Cc:     "'Anna Schumaker'" <anna.schumaker@...app.com>,
        "'Chuck Lever'" <chuck.lever@...cle.com>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v3] NFSv4: try lease recovery on NFS4ERR_EXPIRED

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;
-- 
1.8.3.1