nfs4state.c

	nfs_delegation_reap_unclaimed(clp);
}

static void nfs_delegation_clear_all(struct nfs_client *clp)
{
	nfs_delegation_mark_reclaim(clp);
	nfs_delegation_reap_unclaimed(clp);
}

static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
{
	nfs_delegation_clear_all(clp);
	nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
}

static void nfs4_state_end_reclaim_nograce(struct nfs_client *clp)
{
	clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
}

static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
{
	struct rb_node *pos;
	int status = 0;

	/* Note: list is protected by exclusive lock on cl->cl_sem */
	for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
		struct nfs4_state_owner *sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
		status = nfs4_reclaim_open_state(sp, ops);
		if (status < 0)
			break;
	}
	return status;
}

static int nfs4_check_lease(struct nfs_client *clp)
{
	struct rpc_cred *cred;
	int status = -NFS4ERR_EXPIRED;

	/* Are there any open files on this volume? */
	cred = nfs4_get_renew_cred(clp);
	if (cred != NULL) {
		/* Yes there are: try to renew the old lease */
		status = nfs4_proc_renew(clp, cred);
		put_rpccred(cred);
		switch (status) {
			case -NFS4ERR_CB_PATH_DOWN:
				set_bit(NFS4CLNT_CB_PATH_DOWN, &clp->cl_state);
				break;
			case -NFS4ERR_STALE_CLIENTID:
			case -NFS4ERR_LEASE_MOVED:
				set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
				nfs4_state_start_reclaim_reboot(clp);
				break;
			case -NFS4ERR_EXPIRED:
				set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
				nfs4_state_start_reclaim_nograce(clp);
		}
		return status;
	}

	/* "reboot" to ensure we clear all state on the server */
	clp->cl_boot_time = CURRENT_TIME;
	set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
	return status;
}

static int nfs4_reclaim_lease(struct nfs_client *clp)
{
	struct rpc_cred *cred;
	int status = -ENOENT;

	cred = nfs4_get_setclientid_cred(clp);
	if (cred != NULL) {
		status = nfs4_init_client(clp, cred);
		put_rpccred(cred);
		/* Handle case where the user hasn't set up machine creds */
		if (status == -EACCES && cred == clp->cl_machine_cred) {
			nfs4_clear_machine_cred(clp);
			status = -EAGAIN;
		}
	}
	return status;
}

static int reclaimer(void *ptr)
{
	struct nfs_client *clp = ptr;
	int status = 0;

	allow_signal(SIGKILL);

	/* Ensure exclusive access to NFSv4 state */
	down_write(&clp->cl_sem);
	while (!list_empty(&clp->cl_superblocks)) {
		status = nfs4_check_lease(clp);

		if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
			/* We're going to have to re-establish a clientid */
			status = nfs4_reclaim_lease(clp);
			if (status) {
				set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
				if (status == -EAGAIN)
					continue;
				goto out_error;
			}
		}

		/* First recover reboot state... */
		if (test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
			/* Note: list is protected by exclusive lock on cl->cl_sem */
			status = nfs4_do_reclaim(clp, &nfs4_reboot_recovery_ops);
			if (status == -NFS4ERR_STALE_CLIENTID) {
				set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
				continue;
			}
			nfs4_state_end_reclaim_reboot(clp);
			continue;
		}

		/* Now recover expired state... */
		if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
			/* Note: list is protected by exclusive lock on cl->cl_sem */
			status = nfs4_do_reclaim(clp, &nfs4_nograce_recovery_ops);
			if (status < 0) {
				set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
				if (status == -NFS4ERR_STALE_CLIENTID)
					continue;
				if (status == -NFS4ERR_EXPIRED)
					continue;
				goto out_error;
			} else
				nfs4_state_end_reclaim_nograce(clp);
			continue;
		}
		break;
	}
out:
	up_write(&clp->cl_sem);
	if (test_and_clear_bit(NFS4CLNT_CB_PATH_DOWN, &clp->cl_state))
		nfs_handle_cb_pathdown(clp);
	nfs4_clear_recover_bit(clp);
	nfs_put_client(clp);
	module_put_and_exit(0);
	return 0;
out_error:
	printk(KERN_WARNING "Error: state recovery failed on NFSv4 server %s"
			" with error %d\n", clp->cl_hostname, -status);
	if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
		nfs4_state_end_reclaim_reboot(clp);
	goto out;
}

/*
 * Local variables:
 *  c-basic-offset: 8
 * End:
 */