linux-kernel - [PATCH v2] NFSv4: try lease recovery on NFS4ERR

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Date:   Wed, 8 Jan 2020 21:48:29 -0000
From:   "Robert Milkowski" <rmilkowski@...il.com>
To:     <linux-nfs@...r.kernel.org>
Cc:     "'Trond Myklebust'" <trondmy@...merspace.com>,
        "'Chuck Lever'" <chuck.lever@...cle.com>,
        "'Anna Schumaker'" <anna.schumaker@...app.com>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v2] NFSv4: try lease recovery on NFS4ERR_EXPIRED

From: Robert Milkowski <rmilkowski@...il.com>

Currently, if an nfs server returns NFS4ERR_EXPIRED to open(), etc.
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 | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 76d3716..2478405 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -481,6 +481,10 @@ static int nfs4_do_handle_exception(struct nfs_server
*server,
 						stateid);
 				goto wait_on_recovery;
 			}
+			if (state == NULL) {
+				nfs4_schedule_lease_recovery(clp);
+				goto wait_on_recovery;
+			}
 			/* Fall through */
 		case -NFS4ERR_OPENMODE:
 			if (inode) {
-- 
1.8.3.1