Example #1
0
/*
 * we try to keep at least PTLRPC_MAX_BRW_PAGES pages in the pool.
 */
static unsigned long enc_pools_shrink_scan(struct shrinker *s,
					   struct shrink_control *sc)
{
	spin_lock(&page_pools.epp_lock);
	sc->nr_to_scan = min_t(unsigned long, sc->nr_to_scan,
			      page_pools.epp_free_pages - PTLRPC_MAX_BRW_PAGES);
	if (sc->nr_to_scan > 0) {
		enc_pools_release_free_pages(sc->nr_to_scan);
		CDEBUG(D_SEC, "released %ld pages, %ld left\n",
		       (long)sc->nr_to_scan, page_pools.epp_free_pages);

		page_pools.epp_st_shrinks++;
		page_pools.epp_last_shrink = ktime_get_seconds();
	}
	spin_unlock(&page_pools.epp_lock);

	/*
	 * if no pool access for a long time, we consider it's fully idle.
	 * a little race here is fine.
	 */
	if (unlikely(ktime_get_seconds() - page_pools.epp_last_access >
		     CACHE_QUIESCENT_PERIOD)) {
		spin_lock(&page_pools.epp_lock);
		page_pools.epp_idle_idx = IDLE_IDX_MAX;
		spin_unlock(&page_pools.epp_lock);
	}

	LASSERT(page_pools.epp_idle_idx <= IDLE_IDX_MAX);
	return sc->nr_to_scan;
}
Example #2
0
/*
 * /sys/kernel/debug/lustre/sptlrpc/encrypt_page_pools
 */
int sptlrpc_proc_enc_pool_seq_show(struct seq_file *m, void *v)
{
	spin_lock(&page_pools.epp_lock);

	seq_printf(m,
		   "physical pages:	  %lu\n"
		   "pages per pool:	  %lu\n"
		   "max pages:	       %lu\n"
		   "max pools:	       %u\n"
		   "total pages:	     %lu\n"
		   "total free:	      %lu\n"
		   "idle index:	      %lu/100\n"
		   "last shrink:	     %lds\n"
		   "last access:	     %lds\n"
		   "max pages reached:       %lu\n"
		   "grows:		   %u\n"
		   "grows failure:	   %u\n"
		   "shrinks:		 %u\n"
		   "cache access:	    %lu\n"
		   "cache missing:	   %lu\n"
		   "low free mark:	   %lu\n"
		   "max waitqueue depth:     %u\n"
		   "max wait time:	   %ld/%lu\n"
		   "out of mem:		 %lu\n",
		   totalram_pages,
		   PAGES_PER_POOL,
		   page_pools.epp_max_pages,
		   page_pools.epp_max_pools,
		   page_pools.epp_total_pages,
		   page_pools.epp_free_pages,
		   page_pools.epp_idle_idx,
		   (long)(ktime_get_seconds() - page_pools.epp_last_shrink),
		   (long)(ktime_get_seconds() - page_pools.epp_last_access),
		   page_pools.epp_st_max_pages,
		   page_pools.epp_st_grows,
		   page_pools.epp_st_grow_fails,
		   page_pools.epp_st_shrinks,
		   page_pools.epp_st_access,
		   page_pools.epp_st_missings,
		   page_pools.epp_st_lowfree,
		   page_pools.epp_st_max_wqlen,
		   page_pools.epp_st_max_wait,
		   msecs_to_jiffies(MSEC_PER_SEC),
		   page_pools.epp_st_outofmem);

	spin_unlock(&page_pools.epp_lock);

	return 0;
}
Example #3
0
int sptlrpc_enc_pool_init(void)
{
	/*
	 * maximum capacity is 1/8 of total physical memory.
	 * is the 1/8 a good number?
	 */
	page_pools.epp_max_pages = totalram_pages / 8;
	page_pools.epp_max_pools = npages_to_npools(page_pools.epp_max_pages);

	init_waitqueue_head(&page_pools.epp_waitq);
	page_pools.epp_waitqlen = 0;
	page_pools.epp_pages_short = 0;

	page_pools.epp_growing = 0;

	page_pools.epp_idle_idx = 0;
	page_pools.epp_last_shrink = ktime_get_seconds();
	page_pools.epp_last_access = ktime_get_seconds();

	spin_lock_init(&page_pools.epp_lock);
	page_pools.epp_total_pages = 0;
	page_pools.epp_free_pages = 0;

	page_pools.epp_st_max_pages = 0;
	page_pools.epp_st_grows = 0;
	page_pools.epp_st_grow_fails = 0;
	page_pools.epp_st_shrinks = 0;
	page_pools.epp_st_access = 0;
	page_pools.epp_st_missings = 0;
	page_pools.epp_st_lowfree = 0;
	page_pools.epp_st_max_wqlen = 0;
	page_pools.epp_st_max_wait = 0;
	page_pools.epp_st_outofmem = 0;

	enc_pools_alloc();
	if (!page_pools.epp_pools)
		return -ENOMEM;

	register_shrinker(&pools_shrinker);

	return 0;
}
Example #4
0
static int osd_scrub_post(const struct lu_env *env, struct osd_device *dev,
			  int result)
{
	struct lustre_scrub *scrub = &dev->od_scrub;
	struct scrub_file *sf = &scrub->os_file;
	int rc;
	ENTRY;

	CDEBUG(D_LFSCK, "%s: OI scrub post with result = %d\n",
	       scrub->os_name, result);

	down_write(&scrub->os_rwsem);
	spin_lock(&scrub->os_lock);
	thread_set_flags(&scrub->os_thread, SVC_STOPPING);
	spin_unlock(&scrub->os_lock);
	if (scrub->os_new_checked > 0) {
		sf->sf_items_checked += scrub->os_new_checked;
		scrub->os_new_checked = 0;
		sf->sf_pos_last_checkpoint = scrub->os_pos_current;
	}
	sf->sf_time_last_checkpoint = ktime_get_real_seconds();
	if (result > 0) {
		sf->sf_status = SS_COMPLETED;
		if (!(sf->sf_param & SP_DRYRUN)) {
			memset(sf->sf_oi_bitmap, 0, SCRUB_OI_BITMAP_SIZE);
			sf->sf_flags &= ~(SF_RECREATED | SF_INCONSISTENT |
					  SF_UPGRADE | SF_AUTO);
		}
		sf->sf_time_last_complete = sf->sf_time_last_checkpoint;
		sf->sf_success_count++;
	} else if (result == 0) {
		if (scrub->os_paused)
			sf->sf_status = SS_PAUSED;
		else
			sf->sf_status = SS_STOPPED;
	} else {
		sf->sf_status = SS_FAILED;
	}
	sf->sf_run_time += ktime_get_seconds() -
			   scrub->os_time_last_checkpoint;

	rc = scrub_file_store(env, scrub);
	up_write(&scrub->os_rwsem);

	RETURN(rc < 0 ? rc : result);
}
Example #5
0
/*
 * we try to keep at least PTLRPC_MAX_BRW_PAGES pages in the pool.
 */
static unsigned long enc_pools_shrink_count(struct shrinker *s,
					    struct shrink_control *sc)
{
	/*
	 * if no pool access for a long time, we consider it's fully idle.
	 * a little race here is fine.
	 */
	if (unlikely(ktime_get_seconds() - page_pools.epp_last_access >
		     CACHE_QUIESCENT_PERIOD)) {
		spin_lock(&page_pools.epp_lock);
		page_pools.epp_idle_idx = IDLE_IDX_MAX;
		spin_unlock(&page_pools.epp_lock);
	}

	LASSERT(page_pools.epp_idle_idx <= IDLE_IDX_MAX);
	return max((int)page_pools.epp_free_pages - PTLRPC_MAX_BRW_PAGES, 0) *
		(IDLE_IDX_MAX - page_pools.epp_idle_idx) / IDLE_IDX_MAX;
}
Example #6
0
/*
 * Retransmit terminal ACK or ABORT of the previous call.
 */
static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
				       struct sk_buff *skb,
				       unsigned int channel)
{
	struct rxrpc_skb_priv *sp = skb ? rxrpc_skb(skb) : NULL;
	struct rxrpc_channel *chan;
	struct msghdr msg;
	struct kvec iov[3];
	struct {
		struct rxrpc_wire_header whdr;
		union {
			__be32 abort_code;
			struct rxrpc_ackpacket ack;
		};
	} __attribute__((packed)) pkt;
	struct rxrpc_ackinfo ack_info;
	size_t len;
	int ret, ioc;
	u32 serial, mtu, call_id, padding;

	_enter("%d", conn->debug_id);

	chan = &conn->channels[channel];

	/* If the last call got moved on whilst we were waiting to run, just
	 * ignore this packet.
	 */
	call_id = READ_ONCE(chan->last_call);
	/* Sync with __rxrpc_disconnect_call() */
	smp_rmb();
	if (skb && call_id != sp->hdr.callNumber)
		return;

	msg.msg_name	= &conn->params.peer->srx.transport;
	msg.msg_namelen	= conn->params.peer->srx.transport_len;
	msg.msg_control	= NULL;
	msg.msg_controllen = 0;
	msg.msg_flags	= 0;

	iov[0].iov_base	= &pkt;
	iov[0].iov_len	= sizeof(pkt.whdr);
	iov[1].iov_base	= &padding;
	iov[1].iov_len	= 3;
	iov[2].iov_base	= &ack_info;
	iov[2].iov_len	= sizeof(ack_info);

	pkt.whdr.epoch		= htonl(conn->proto.epoch);
	pkt.whdr.cid		= htonl(conn->proto.cid | channel);
	pkt.whdr.callNumber	= htonl(call_id);
	pkt.whdr.seq		= 0;
	pkt.whdr.type		= chan->last_type;
	pkt.whdr.flags		= conn->out_clientflag;
	pkt.whdr.userStatus	= 0;
	pkt.whdr.securityIndex	= conn->security_ix;
	pkt.whdr._rsvd		= 0;
	pkt.whdr.serviceId	= htons(conn->service_id);

	len = sizeof(pkt.whdr);
	switch (chan->last_type) {
	case RXRPC_PACKET_TYPE_ABORT:
		pkt.abort_code	= htonl(chan->last_abort);
		iov[0].iov_len += sizeof(pkt.abort_code);
		len += sizeof(pkt.abort_code);
		ioc = 1;
		break;

	case RXRPC_PACKET_TYPE_ACK:
		mtu = conn->params.peer->if_mtu;
		mtu -= conn->params.peer->hdrsize;
		pkt.ack.bufferSpace	= 0;
		pkt.ack.maxSkew		= htons(skb ? skb->priority : 0);
		pkt.ack.firstPacket	= htonl(chan->last_seq + 1);
		pkt.ack.previousPacket	= htonl(chan->last_seq);
		pkt.ack.serial		= htonl(skb ? sp->hdr.serial : 0);
		pkt.ack.reason		= skb ? RXRPC_ACK_DUPLICATE : RXRPC_ACK_IDLE;
		pkt.ack.nAcks		= 0;
		ack_info.rxMTU		= htonl(rxrpc_rx_mtu);
		ack_info.maxMTU		= htonl(mtu);
		ack_info.rwind		= htonl(rxrpc_rx_window_size);
		ack_info.jumbo_max	= htonl(rxrpc_rx_jumbo_max);
		pkt.whdr.flags		|= RXRPC_SLOW_START_OK;
		padding			= 0;
		iov[0].iov_len += sizeof(pkt.ack);
		len += sizeof(pkt.ack) + 3 + sizeof(ack_info);
		ioc = 3;
		break;

	default:
		return;
	}

	/* Resync with __rxrpc_disconnect_call() and check that the last call
	 * didn't get advanced whilst we were filling out the packets.
	 */
	smp_rmb();
	if (READ_ONCE(chan->last_call) != call_id)
		return;

	serial = atomic_inc_return(&conn->serial);
	pkt.whdr.serial = htonl(serial);

	switch (chan->last_type) {
	case RXRPC_PACKET_TYPE_ABORT:
		_proto("Tx ABORT %%%u { %d } [re]", serial, conn->local_abort);
		break;
	case RXRPC_PACKET_TYPE_ACK:
		trace_rxrpc_tx_ack(chan->call_debug_id, serial,
				   ntohl(pkt.ack.firstPacket),
				   ntohl(pkt.ack.serial),
				   pkt.ack.reason, 0);
		_proto("Tx ACK %%%u [re]", serial);
		break;
	}

	ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, ioc, len);
	conn->params.peer->last_tx_at = ktime_get_seconds();
	if (ret < 0)
		trace_rxrpc_tx_fail(chan->call_debug_id, serial, ret,
				    rxrpc_tx_point_call_final_resend);
	else
		trace_rxrpc_tx_packet(chan->call_debug_id, &pkt.whdr,
				      rxrpc_tx_point_call_final_resend);

	_leave("");
}
Example #7
0
/*
 * generate a connection-level abort
 */
static int rxrpc_abort_connection(struct rxrpc_connection *conn,
				  int error, u32 abort_code)
{
	struct rxrpc_wire_header whdr;
	struct msghdr msg;
	struct kvec iov[2];
	__be32 word;
	size_t len;
	u32 serial;
	int ret;

	_enter("%d,,%u,%u", conn->debug_id, error, abort_code);

	/* generate a connection-level abort */
	spin_lock_bh(&conn->state_lock);
	if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
		spin_unlock_bh(&conn->state_lock);
		_leave(" = 0 [already dead]");
		return 0;
	}

	conn->state = RXRPC_CONN_LOCALLY_ABORTED;
	spin_unlock_bh(&conn->state_lock);

	rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code, error);

	msg.msg_name	= &conn->params.peer->srx.transport;
	msg.msg_namelen	= conn->params.peer->srx.transport_len;
	msg.msg_control	= NULL;
	msg.msg_controllen = 0;
	msg.msg_flags	= 0;

	whdr.epoch	= htonl(conn->proto.epoch);
	whdr.cid	= htonl(conn->proto.cid);
	whdr.callNumber	= 0;
	whdr.seq	= 0;
	whdr.type	= RXRPC_PACKET_TYPE_ABORT;
	whdr.flags	= conn->out_clientflag;
	whdr.userStatus	= 0;
	whdr.securityIndex = conn->security_ix;
	whdr._rsvd	= 0;
	whdr.serviceId	= htons(conn->service_id);

	word		= htonl(conn->local_abort);

	iov[0].iov_base	= &whdr;
	iov[0].iov_len	= sizeof(whdr);
	iov[1].iov_base	= &word;
	iov[1].iov_len	= sizeof(word);

	len = iov[0].iov_len + iov[1].iov_len;

	serial = atomic_inc_return(&conn->serial);
	whdr.serial = htonl(serial);
	_proto("Tx CONN ABORT %%%u { %d }", serial, conn->local_abort);

	ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
	if (ret < 0) {
		trace_rxrpc_tx_fail(conn->debug_id, serial, ret,
				    rxrpc_tx_point_conn_abort);
		_debug("sendmsg failed: %d", ret);
		return -EAGAIN;
	}

	trace_rxrpc_tx_packet(conn->debug_id, &whdr, rxrpc_tx_point_conn_abort);

	conn->params.peer->last_tx_at = ktime_get_seconds();

	_leave(" = 0");
	return 0;
}
Example #8
0
/**
 * Send request \a request.
 * if \a noreply is set, don't expect any reply back and don't set up
 * reply buffers.
 * Returns 0 on success or error code.
 */
int ptl_send_rpc(struct ptlrpc_request *request, int noreply)
{
	int rc;
	int rc2;
	int mpflag = 0;
	struct ptlrpc_connection *connection;
	lnet_handle_me_t reply_me_h;
	lnet_md_t reply_md;
	struct obd_import *imp = request->rq_import;
	struct obd_device *obd = imp->imp_obd;

	if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_RPC))
		return 0;

	LASSERT(request->rq_type == PTL_RPC_MSG_REQUEST);
	LASSERT(request->rq_wait_ctx == 0);

	/* If this is a re-transmit, we're required to have disengaged
	 * cleanly from the previous attempt
	 */
	LASSERT(!request->rq_receiving_reply);
	LASSERT(!((lustre_msg_get_flags(request->rq_reqmsg) & MSG_REPLAY) &&
		  (imp->imp_state == LUSTRE_IMP_FULL)));

	if (unlikely(obd && obd->obd_fail)) {
		CDEBUG(D_HA, "muting rpc for failed imp obd %s\n",
		       obd->obd_name);
		/* this prevents us from waiting in ptlrpc_queue_wait */
		spin_lock(&request->rq_lock);
		request->rq_err = 1;
		spin_unlock(&request->rq_lock);
		request->rq_status = -ENODEV;
		return -ENODEV;
	}

	connection = imp->imp_connection;

	lustre_msg_set_handle(request->rq_reqmsg,
			      &imp->imp_remote_handle);
	lustre_msg_set_type(request->rq_reqmsg, PTL_RPC_MSG_REQUEST);
	lustre_msg_set_conn_cnt(request->rq_reqmsg, imp->imp_conn_cnt);
	lustre_msghdr_set_flags(request->rq_reqmsg, imp->imp_msghdr_flags);

	/*
	 * If it's the first time to resend the request for EINPROGRESS,
	 * we need to allocate a new XID (see after_reply()), it's different
	 * from the resend for reply timeout.
	 */
	if (request->rq_nr_resend && list_empty(&request->rq_unreplied_list)) {
		__u64 min_xid = 0;
		/*
		 * resend for EINPROGRESS, allocate new xid to avoid reply
		 * reconstruction
		 */
		spin_lock(&imp->imp_lock);
		ptlrpc_assign_next_xid_nolock(request);
		min_xid = ptlrpc_known_replied_xid(imp);
		spin_unlock(&imp->imp_lock);

		lustre_msg_set_last_xid(request->rq_reqmsg, min_xid);
		DEBUG_REQ(D_RPCTRACE, request, "Allocating new xid for resend on EINPROGRESS");
	}

	if (request->rq_bulk) {
		ptlrpc_set_bulk_mbits(request);
		lustre_msg_set_mbits(request->rq_reqmsg, request->rq_mbits);
	}

	if (list_empty(&request->rq_unreplied_list) ||
	    request->rq_xid <= imp->imp_known_replied_xid) {
		DEBUG_REQ(D_ERROR, request,
			  "xid: %llu, replied: %llu, list_empty:%d\n",
			  request->rq_xid, imp->imp_known_replied_xid,
			  list_empty(&request->rq_unreplied_list));
		LBUG();
	}

	/**
	 * For enabled AT all request should have AT_SUPPORT in the
	 * FULL import state when OBD_CONNECT_AT is set
	 */
	LASSERT(AT_OFF || imp->imp_state != LUSTRE_IMP_FULL ||
		(imp->imp_msghdr_flags & MSGHDR_AT_SUPPORT) ||
		!(imp->imp_connect_data.ocd_connect_flags &
		OBD_CONNECT_AT));

	if (request->rq_resend)
		lustre_msg_add_flags(request->rq_reqmsg, MSG_RESENT);

	if (request->rq_memalloc)
		mpflag = cfs_memory_pressure_get_and_set();

	rc = sptlrpc_cli_wrap_request(request);
	if (rc) {
		/*
		 * set rq_sent so that this request is treated
		 * as a delayed send in the upper layers
		 */
		if (rc == -ENOMEM)
			request->rq_sent = ktime_get_seconds();
		goto out;
	}

	/* bulk register should be done after wrap_request() */
	if (request->rq_bulk) {
		rc = ptlrpc_register_bulk(request);
		if (rc != 0)
			goto out;
	}

	if (!noreply) {
		LASSERT(request->rq_replen != 0);
		if (!request->rq_repbuf) {
			LASSERT(!request->rq_repdata);
			LASSERT(!request->rq_repmsg);
			rc = sptlrpc_cli_alloc_repbuf(request,
						      request->rq_replen);
			if (rc) {
				/* this prevents us from looping in
				 * ptlrpc_queue_wait
				 */
				spin_lock(&request->rq_lock);
				request->rq_err = 1;
				spin_unlock(&request->rq_lock);
				request->rq_status = rc;
				goto cleanup_bulk;
			}
		} else {
			request->rq_repdata = NULL;
			request->rq_repmsg = NULL;
		}

		rc = LNetMEAttach(request->rq_reply_portal,/*XXX FIXME bug 249*/
				  connection->c_peer, request->rq_xid, 0,
				  LNET_UNLINK, LNET_INS_AFTER, &reply_me_h);
		if (rc != 0) {
			CERROR("LNetMEAttach failed: %d\n", rc);
			LASSERT(rc == -ENOMEM);
			rc = -ENOMEM;
			goto cleanup_bulk;
		}
	}

	spin_lock(&request->rq_lock);
	/* We are responsible for unlinking the reply buffer */
	request->rq_reply_unlinked = noreply;
	request->rq_receiving_reply = !noreply;
	/* Clear any flags that may be present from previous sends. */
	request->rq_req_unlinked = 0;
	request->rq_replied = 0;
	request->rq_err = 0;
	request->rq_timedout = 0;
	request->rq_net_err = 0;
	request->rq_resend = 0;
	request->rq_restart = 0;
	request->rq_reply_truncated = 0;
	spin_unlock(&request->rq_lock);

	if (!noreply) {
		reply_md.start = request->rq_repbuf;
		reply_md.length = request->rq_repbuf_len;
		/* Allow multiple early replies */
		reply_md.threshold = LNET_MD_THRESH_INF;
		/* Manage remote for early replies */
		reply_md.options = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT |
			LNET_MD_MANAGE_REMOTE |
			LNET_MD_TRUNCATE; /* allow to make EOVERFLOW error */
		reply_md.user_ptr = &request->rq_reply_cbid;
		reply_md.eq_handle = ptlrpc_eq_h;

		/* We must see the unlink callback to set rq_reply_unlinked,
		 * so we can't auto-unlink
		 */
		rc = LNetMDAttach(reply_me_h, reply_md, LNET_RETAIN,
				  &request->rq_reply_md_h);
		if (rc != 0) {
			CERROR("LNetMDAttach failed: %d\n", rc);
			LASSERT(rc == -ENOMEM);
			spin_lock(&request->rq_lock);
			/* ...but the MD attach didn't succeed... */
			request->rq_receiving_reply = 0;
			spin_unlock(&request->rq_lock);
			rc = -ENOMEM;
			goto cleanup_me;
		}

		CDEBUG(D_NET, "Setup reply buffer: %u bytes, xid %llu, portal %u\n",
		       request->rq_repbuf_len, request->rq_xid,
		       request->rq_reply_portal);
	}

	/* add references on request for request_out_callback */
	ptlrpc_request_addref(request);
	if (obd && obd->obd_svc_stats)
		lprocfs_counter_add(obd->obd_svc_stats, PTLRPC_REQACTIVE_CNTR,
			atomic_read(&imp->imp_inflight));

	OBD_FAIL_TIMEOUT(OBD_FAIL_PTLRPC_DELAY_SEND, request->rq_timeout + 5);

	ktime_get_real_ts64(&request->rq_sent_tv);
	request->rq_sent = ktime_get_real_seconds();
	/* We give the server rq_timeout secs to process the req, and
	 * add the network latency for our local timeout.
	 */
	request->rq_deadline = request->rq_sent + request->rq_timeout +
		ptlrpc_at_get_net_latency(request);

	ptlrpc_pinger_sending_on_import(imp);

	DEBUG_REQ(D_INFO, request, "send flg=%x",
		  lustre_msg_get_flags(request->rq_reqmsg));
	rc = ptl_send_buf(&request->rq_req_md_h,
			  request->rq_reqbuf, request->rq_reqdata_len,
			  LNET_NOACK_REQ, &request->rq_req_cbid,
			  connection,
			  request->rq_request_portal,
			  request->rq_xid, 0);
	if (likely(rc == 0))
		goto out;

	request->rq_req_unlinked = 1;
	ptlrpc_req_finished(request);
	if (noreply)
		goto out;

 cleanup_me:
	/* MEUnlink is safe; the PUT didn't even get off the ground, and
	 * nobody apart from the PUT's target has the right nid+XID to
	 * access the reply buffer.
	 */
	rc2 = LNetMEUnlink(reply_me_h);
	LASSERT(rc2 == 0);
	/* UNLINKED callback called synchronously */
	LASSERT(!request->rq_receiving_reply);

 cleanup_bulk:
	/* We do sync unlink here as there was no real transfer here so
	 * the chance to have long unlink to sluggish net is smaller here.
	 */
	ptlrpc_unregister_bulk(request, 0);
 out:
	if (request->rq_memalloc)
		cfs_memory_pressure_restore(mpflag);
	return rc;
}