linux-kernel - [141/146] NFSv4: Handle expired stateids when the lease is still valid

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Date:	Wed, 01 Jun 2011 17:01:17 +0900
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [141/146] NFSv4: Handle expired stateids when the lease is still valid

2.6.38-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Trond Myklebust <Trond.Myklebust@...app.com>

commit 0ced63d1a245ac11241a5d37932e6d04d9c8040d upstream.

Currently, if the server returns NFS4ERR_EXPIRED in reply to a READ or
WRITE, but the RENEW test determines that the lease is still active, we
fail to recover and end up looping forever in a READ/WRITE + RENEW death
spiral.

Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 fs/nfs/nfs4proc.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -258,9 +258,11 @@ static int nfs4_handle_exception(const s
 				break;
 			nfs4_schedule_stateid_recovery(server, state);
 			goto wait_on_recovery;
+		case -NFS4ERR_EXPIRED:
+			if (state != NULL)
+				nfs4_schedule_stateid_recovery(server, state);
 		case -NFS4ERR_STALE_STATEID:
 		case -NFS4ERR_STALE_CLIENTID:
-		case -NFS4ERR_EXPIRED:
 			nfs4_schedule_lease_recovery(clp);
 			goto wait_on_recovery;
 #if defined(CONFIG_NFS_V4_1)
@@ -3504,9 +3506,11 @@ nfs4_async_handle_error(struct rpc_task
 				break;
 			nfs4_schedule_stateid_recovery(server, state);
 			goto wait_on_recovery;
+		case -NFS4ERR_EXPIRED:
+			if (state != NULL)
+				nfs4_schedule_stateid_recovery(server, state);
 		case -NFS4ERR_STALE_STATEID:
 		case -NFS4ERR_STALE_CLIENTID:
-		case -NFS4ERR_EXPIRED:
 			nfs4_schedule_lease_recovery(clp);
 			goto wait_on_recovery;
 #if defined(CONFIG_NFS_V4_1)
@@ -4397,6 +4401,7 @@ int nfs4_lock_delegation_recall(struct n
 			case -ESTALE:
 				goto out;
 			case -NFS4ERR_EXPIRED:
+				nfs4_schedule_stateid_recovery(server, state);
 			case -NFS4ERR_STALE_CLIENTID:
 			case -NFS4ERR_STALE_STATEID:
 				nfs4_schedule_lease_recovery(server->nfs_client);


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