[added to the 4.1 stable tree] pNFS: The client must not do I/O to the DS if it's lease has expired

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From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>

This patch has been added to the 4.1 stable tree. If you have any
objections, please let us know.

===============

[ Upstream commit b88fa69eaa8649f11828158c7b65c4bcd886ebd5 ]

Ensure that the client conforms to the normative behaviour described in
RFC5661 Section 12.7.2: "If a client believes its lease has expired,
it MUST NOT send I/O to the storage device until it has validated its
lease."

So ensure that we wait for the lease to be validated before using
the layout.

Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # v3.20+
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
---
 fs/nfs/pnfs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index d47c188..ea4fe63 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -1472,6 +1472,7 @@ pnfs_update_layout(struct inode *ino,
 		goto out;
 
 lookup_again:
+	nfs4_client_recover_expired_lease(clp);
 	first = false;
 	spin_lock(&ino->i_lock);
 	lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
-- 
2.7.4
--
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