Commit 994b15b9 authored Sep 05, 2018 by Trond Myklebust Committed by Anna Schumaker Sep 14, 2018

NFSv4.1 fix infinite loop on I/O.



The previous fix broke recovery of delegated stateids because it assumes
that if we did not mark the delegation as suspect, then the delegation has
effectively been revoked, and so it removes that delegation irrespectively
of whether or not it is valid and still in use. While this is "mostly
harmless" for ordinary I/O, we've seen pNFS fail with LAYOUTGET spinning
in an infinite loop while complaining that we're using an invalid stateid
(in this case the all-zero stateid).

What we rather want to do here is ensure that the delegation is always
correctly marked as needing testing when that is the case. So we want
to close the loophole offered by nfs4_schedule_stateid_recovery(),
which marks the state as needing to be reclaimed, but not the
delegation that may be backing it.

Fixes: 0e3d3e5d ("NFSv4.1 fix infinite loop on IO BAD_STATEID error")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Cc: stable@vger.kernel.org # v4.11+
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

parent 2edaead6

fs/nfs/nfs4proc.c

+7 −3

Original line number	Diff line number	Diff line
		@@ -2676,14 +2676,18 @@ static void nfs41_check_delegation_stateid(struct nfs4_state *state)
		}

		nfs4_stateid_copy(&stateid, &delegation->stateid);
		if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags) \|\|
		!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
		&delegation->flags)) {
		if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags)) {
		rcu_read_unlock();
		nfs_finish_clear_delegation_stateid(state, &stateid);
		return;
		}

		if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
		&delegation->flags)) {
		rcu_read_unlock();
		return;
		}

		cred = get_rpccred(delegation->cred);
		rcu_read_unlock();
		status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);

fs/nfs/nfs4state.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1390,6 +1390,8 @@ int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_

		if (!nfs4_state_mark_reclaim_nograce(clp, state))
		return -EBADF;
		nfs_inode_find_delegation_state_and_recover(state->inode,
		&state->stateid);
		dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
		clp->cl_hostname);
		nfs4_schedule_state_manager(clp);

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