pNFS: The client must not do I/O to the DS if it's lease has expired

[ 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@primarydata.com>
Cc: stable@vger.kernel.org # v3.20+
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index d47c188682b163b15e72dd933deb96ba6540b72f..ea4fe630cdaccfd147e91298ec9baa5524dbdf8c 100644 (file)
--- 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);