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

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+

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index bf98f1b2595fb12a7198dac3d4d261cf067cdbeb..6daf034645c830314c89049d9a5484c49e3e2c2d 100644 (file)
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -1555,6 +1555,7 @@ pnfs_update_layout(struct inode *ino,
        }
 
 lookup_again:
+       nfs4_client_recover_expired_lease(clp);
        first = false;
        spin_lock(&ino->i_lock);
        lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);