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    Subject[PATCH 4.7 043/184] pNFS: The client must not do I/O to the DS if its lease has expired
    Date
    4.7-stable review patch.  If anyone has any objections, please let me know.

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

    From: Trond Myklebust <trond.myklebust@primarydata.com>

    commit b88fa69eaa8649f11828158c7b65c4bcd886ebd5 upstream.

    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>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    fs/nfs/pnfs.c | 1 +
    1 file changed, 1 insertion(+)

    --- a/fs/nfs/pnfs.c
    +++ b/fs/nfs/pnfs.c
    @@ -1527,6 +1527,7 @@ 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);

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