X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Fstaging%2Flustre%2Flustre%2Fldlm%2Fldlm_lib.c;fp=kernel%2Fdrivers%2Fstaging%2Flustre%2Flustre%2Fldlm%2Fldlm_lib.c;h=c5c86e73ca52ed6b7462ac2cd2639cc2a999b9f2;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git

diff --git a/kernel/drivers/staging/lustre/lustre/ldlm/ldlm_lib.c b/kernel/drivers/staging/lustre/lustre/ldlm/ldlm_lib.c
new file mode 100644
index 000000000..c5c86e73c
--- /dev/null
+++ b/kernel/drivers/staging/lustre/lustre/ldlm/ldlm_lib.c
@@ -0,0 +1,870 @@
+/*
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2010, 2012, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ */
+
+/**
+ * This file deals with various client/target related logic including recovery.
+ *
+ * TODO: This code more logically belongs in the ptlrpc module than in ldlm and
+ * should be moved.
+ */
+
+#define DEBUG_SUBSYSTEM S_LDLM
+
+#include "../../include/linux/libcfs/libcfs.h"
+#include "../include/obd.h"
+#include "../include/obd_class.h"
+#include "../include/lustre_dlm.h"
+#include "../include/lustre_net.h"
+#include "../include/lustre_sec.h"
+#include "ldlm_internal.h"
+
+/* @priority: If non-zero, move the selected connection to the list head.
+ * @create: If zero, only search in existing connections.
+ */
+static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
+			   int priority, int create)
+{
+	struct ptlrpc_connection *ptlrpc_conn;
+	struct obd_import_conn *imp_conn = NULL, *item;
+	int rc = 0;
+
+	if (!create && !priority) {
+		CDEBUG(D_HA, "Nothing to do\n");
+		return -EINVAL;
+	}
+
+	ptlrpc_conn = ptlrpc_uuid_to_connection(uuid);
+	if (!ptlrpc_conn) {
+		CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
+		return -ENOENT;
+	}
+
+	if (create) {
+		OBD_ALLOC(imp_conn, sizeof(*imp_conn));
+		if (!imp_conn) {
+			rc = -ENOMEM;
+			goto out_put;
+		}
+	}
+
+	spin_lock(&imp->imp_lock);
+	list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
+		if (obd_uuid_equals(uuid, &item->oic_uuid)) {
+			if (priority) {
+				list_del(&item->oic_item);
+				list_add(&item->oic_item,
+					     &imp->imp_conn_list);
+				item->oic_last_attempt = 0;
+			}
+			CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
+			       imp, imp->imp_obd->obd_name, uuid->uuid,
+			       (priority ? ", moved to head" : ""));
+			spin_unlock(&imp->imp_lock);
+			rc = 0;
+			goto out_free;
+		}
+	}
+	/* No existing import connection found for \a uuid. */
+	if (create) {
+		imp_conn->oic_conn = ptlrpc_conn;
+		imp_conn->oic_uuid = *uuid;
+		imp_conn->oic_last_attempt = 0;
+		if (priority)
+			list_add(&imp_conn->oic_item, &imp->imp_conn_list);
+		else
+			list_add_tail(&imp_conn->oic_item,
+					  &imp->imp_conn_list);
+		CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
+		       imp, imp->imp_obd->obd_name, uuid->uuid,
+		       (priority ? "head" : "tail"));
+	} else {
+		spin_unlock(&imp->imp_lock);
+		rc = -ENOENT;
+		goto out_free;
+	}
+
+	spin_unlock(&imp->imp_lock);
+	return 0;
+out_free:
+	if (imp_conn)
+		OBD_FREE(imp_conn, sizeof(*imp_conn));
+out_put:
+	ptlrpc_connection_put(ptlrpc_conn);
+	return rc;
+}
+
+int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
+{
+	return import_set_conn(imp, uuid, 1, 0);
+}
+
+int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
+			   int priority)
+{
+	return import_set_conn(imp, uuid, priority, 1);
+}
+EXPORT_SYMBOL(client_import_add_conn);
+
+int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
+{
+	struct obd_import_conn *imp_conn;
+	struct obd_export *dlmexp;
+	int rc = -ENOENT;
+
+	spin_lock(&imp->imp_lock);
+	if (list_empty(&imp->imp_conn_list)) {
+		LASSERT(!imp->imp_connection);
+		goto out;
+	}
+
+	list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
+		if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
+			continue;
+		LASSERT(imp_conn->oic_conn);
+
+		if (imp_conn == imp->imp_conn_current) {
+			LASSERT(imp_conn->oic_conn == imp->imp_connection);
+
+			if (imp->imp_state != LUSTRE_IMP_CLOSED &&
+			    imp->imp_state != LUSTRE_IMP_DISCON) {
+				CERROR("can't remove current connection\n");
+				rc = -EBUSY;
+				goto out;
+			}
+
+			ptlrpc_connection_put(imp->imp_connection);
+			imp->imp_connection = NULL;
+
+			dlmexp = class_conn2export(&imp->imp_dlm_handle);
+			if (dlmexp && dlmexp->exp_connection) {
+				LASSERT(dlmexp->exp_connection ==
+					imp_conn->oic_conn);
+				ptlrpc_connection_put(dlmexp->exp_connection);
+				dlmexp->exp_connection = NULL;
+			}
+		}
+
+		list_del(&imp_conn->oic_item);
+		ptlrpc_connection_put(imp_conn->oic_conn);
+		OBD_FREE(imp_conn, sizeof(*imp_conn));
+		CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
+		       imp, imp->imp_obd->obd_name, uuid->uuid);
+		rc = 0;
+		break;
+	}
+out:
+	spin_unlock(&imp->imp_lock);
+	if (rc == -ENOENT)
+		CERROR("connection %s not found\n", uuid->uuid);
+	return rc;
+}
+EXPORT_SYMBOL(client_import_del_conn);
+
+/**
+ * Find conn UUID by peer NID. \a peer is a server NID. This function is used
+ * to find a conn uuid of \a imp which can reach \a peer.
+ */
+int client_import_find_conn(struct obd_import *imp, lnet_nid_t peer,
+			    struct obd_uuid *uuid)
+{
+	struct obd_import_conn *conn;
+	int rc = -ENOENT;
+
+	spin_lock(&imp->imp_lock);
+	list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
+		/* Check if conn UUID does have this peer NID. */
+		if (class_check_uuid(&conn->oic_uuid, peer)) {
+			*uuid = conn->oic_uuid;
+			rc = 0;
+			break;
+		}
+	}
+	spin_unlock(&imp->imp_lock);
+	return rc;
+}
+EXPORT_SYMBOL(client_import_find_conn);
+
+void client_destroy_import(struct obd_import *imp)
+{
+	/* Drop security policy instance after all RPCs have finished/aborted
+	 * to let all busy contexts be released. */
+	class_import_get(imp);
+	class_destroy_import(imp);
+	sptlrpc_import_sec_put(imp);
+	class_import_put(imp);
+}
+EXPORT_SYMBOL(client_destroy_import);
+
+/**
+ * Check whether or not the OSC is on MDT.
+ * In the config log,
+ * osc on MDT
+ *	setup 0:{fsname}-OSTxxxx-osc[-MDTxxxx] 1:lustre-OST0000_UUID 2:NID
+ * osc on client
+ *	setup 0:{fsname}-OSTxxxx-osc 1:lustre-OST0000_UUID 2:NID
+ *
+ **/
+static int osc_on_mdt(char *obdname)
+{
+	char *ptr;
+
+	ptr = strrchr(obdname, '-');
+	if (ptr == NULL)
+		return 0;
+
+	if (strncmp(ptr + 1, "MDT", 3) == 0)
+		return 1;
+
+	return 0;
+}
+
+/* Configure an RPC client OBD device.
+ *
+ * lcfg parameters:
+ * 1 - client UUID
+ * 2 - server UUID
+ * 3 - inactive-on-startup
+ */
+int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
+{
+	struct client_obd *cli = &obddev->u.cli;
+	struct obd_import *imp;
+	struct obd_uuid server_uuid;
+	int rq_portal, rp_portal, connect_op;
+	char *name = obddev->obd_type->typ_name;
+	ldlm_ns_type_t ns_type = LDLM_NS_TYPE_UNKNOWN;
+	int rc;
+
+	/* In a more perfect world, we would hang a ptlrpc_client off of
+	 * obd_type and just use the values from there. */
+	if (!strcmp(name, LUSTRE_OSC_NAME)) {
+		rq_portal = OST_REQUEST_PORTAL;
+		rp_portal = OSC_REPLY_PORTAL;
+		connect_op = OST_CONNECT;
+		cli->cl_sp_me = LUSTRE_SP_CLI;
+		cli->cl_sp_to = LUSTRE_SP_OST;
+		ns_type = LDLM_NS_TYPE_OSC;
+	} else if (!strcmp(name, LUSTRE_MDC_NAME) ||
+		   !strcmp(name, LUSTRE_LWP_NAME)) {
+		rq_portal = MDS_REQUEST_PORTAL;
+		rp_portal = MDC_REPLY_PORTAL;
+		connect_op = MDS_CONNECT;
+		cli->cl_sp_me = LUSTRE_SP_CLI;
+		cli->cl_sp_to = LUSTRE_SP_MDT;
+		ns_type = LDLM_NS_TYPE_MDC;
+	} else if (!strcmp(name, LUSTRE_OSP_NAME)) {
+		if (strstr(lustre_cfg_buf(lcfg, 1), "OST") == NULL) {
+			/* OSP_on_MDT for other MDTs */
+			connect_op = MDS_CONNECT;
+			cli->cl_sp_to = LUSTRE_SP_MDT;
+			ns_type = LDLM_NS_TYPE_MDC;
+			rq_portal = OUT_PORTAL;
+		} else {
+			/* OSP on MDT for OST */
+			connect_op = OST_CONNECT;
+			cli->cl_sp_to = LUSTRE_SP_OST;
+			ns_type = LDLM_NS_TYPE_OSC;
+			rq_portal = OST_REQUEST_PORTAL;
+		}
+		rp_portal = OSC_REPLY_PORTAL;
+		cli->cl_sp_me = LUSTRE_SP_CLI;
+	} else if (!strcmp(name, LUSTRE_MGC_NAME)) {
+		rq_portal = MGS_REQUEST_PORTAL;
+		rp_portal = MGC_REPLY_PORTAL;
+		connect_op = MGS_CONNECT;
+		cli->cl_sp_me = LUSTRE_SP_MGC;
+		cli->cl_sp_to = LUSTRE_SP_MGS;
+		cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
+		ns_type = LDLM_NS_TYPE_MGC;
+	} else {
+		CERROR("unknown client OBD type \"%s\", can't setup\n",
+		       name);
+		return -EINVAL;
+	}
+
+	if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
+		CERROR("requires a TARGET UUID\n");
+		return -EINVAL;
+	}
+
+	if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
+		CERROR("client UUID must be less than 38 characters\n");
+		return -EINVAL;
+	}
+
+	if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
+		CERROR("setup requires a SERVER UUID\n");
+		return -EINVAL;
+	}
+
+	if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
+		CERROR("target UUID must be less than 38 characters\n");
+		return -EINVAL;
+	}
+
+	init_rwsem(&cli->cl_sem);
+	mutex_init(&cli->cl_mgc_mutex);
+	cli->cl_conn_count = 0;
+	memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
+	       min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
+		     sizeof(server_uuid)));
+
+	cli->cl_dirty = 0;
+	cli->cl_avail_grant = 0;
+	/* FIXME: Should limit this for the sum of all cl_dirty_max. */
+	cli->cl_dirty_max = OSC_MAX_DIRTY_DEFAULT * 1024 * 1024;
+	if (cli->cl_dirty_max >> PAGE_CACHE_SHIFT > totalram_pages / 8)
+		cli->cl_dirty_max = totalram_pages << (PAGE_CACHE_SHIFT - 3);
+	INIT_LIST_HEAD(&cli->cl_cache_waiters);
+	INIT_LIST_HEAD(&cli->cl_loi_ready_list);
+	INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
+	INIT_LIST_HEAD(&cli->cl_loi_write_list);
+	INIT_LIST_HEAD(&cli->cl_loi_read_list);
+	client_obd_list_lock_init(&cli->cl_loi_list_lock);
+	atomic_set(&cli->cl_pending_w_pages, 0);
+	atomic_set(&cli->cl_pending_r_pages, 0);
+	cli->cl_r_in_flight = 0;
+	cli->cl_w_in_flight = 0;
+
+	spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
+	spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
+	spin_lock_init(&cli->cl_read_page_hist.oh_lock);
+	spin_lock_init(&cli->cl_write_page_hist.oh_lock);
+	spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
+	spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
+
+	/* lru for osc. */
+	INIT_LIST_HEAD(&cli->cl_lru_osc);
+	atomic_set(&cli->cl_lru_shrinkers, 0);
+	atomic_set(&cli->cl_lru_busy, 0);
+	atomic_set(&cli->cl_lru_in_list, 0);
+	INIT_LIST_HEAD(&cli->cl_lru_list);
+	client_obd_list_lock_init(&cli->cl_lru_list_lock);
+
+	init_waitqueue_head(&cli->cl_destroy_waitq);
+	atomic_set(&cli->cl_destroy_in_flight, 0);
+	/* Turn on checksumming by default. */
+	cli->cl_checksum = 1;
+	/*
+	 * The supported checksum types will be worked out at connect time
+	 * Set cl_chksum* to CRC32 for now to avoid returning screwed info
+	 * through procfs.
+	 */
+	cli->cl_cksum_type = cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
+	atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
+
+	/* This value may be reduced at connect time in
+	 * ptlrpc_connect_interpret() . We initialize it to only
+	 * 1MB until we know what the performance looks like.
+	 * In the future this should likely be increased. LU-1431 */
+	cli->cl_max_pages_per_rpc = min_t(int, PTLRPC_MAX_BRW_PAGES,
+					  LNET_MTU >> PAGE_CACHE_SHIFT);
+
+	if (!strcmp(name, LUSTRE_MDC_NAME)) {
+		cli->cl_max_rpcs_in_flight = MDC_MAX_RIF_DEFAULT;
+	} else if (totalram_pages >> (20 - PAGE_CACHE_SHIFT) <= 128 /* MB */) {
+		cli->cl_max_rpcs_in_flight = 2;
+	} else if (totalram_pages >> (20 - PAGE_CACHE_SHIFT) <= 256 /* MB */) {
+		cli->cl_max_rpcs_in_flight = 3;
+	} else if (totalram_pages >> (20 - PAGE_CACHE_SHIFT) <= 512 /* MB */) {
+		cli->cl_max_rpcs_in_flight = 4;
+	} else {
+		if (osc_on_mdt(obddev->obd_name))
+			cli->cl_max_rpcs_in_flight = MDS_OSC_MAX_RIF_DEFAULT;
+		else
+			cli->cl_max_rpcs_in_flight = OSC_MAX_RIF_DEFAULT;
+	}
+	rc = ldlm_get_ref();
+	if (rc) {
+		CERROR("ldlm_get_ref failed: %d\n", rc);
+		goto err;
+	}
+
+	ptlrpc_init_client(rq_portal, rp_portal, name,
+			   &obddev->obd_ldlm_client);
+
+	imp = class_new_import(obddev);
+	if (imp == NULL) {
+		rc = -ENOENT;
+		goto err_ldlm;
+	}
+	imp->imp_client = &obddev->obd_ldlm_client;
+	imp->imp_connect_op = connect_op;
+	memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
+	       LUSTRE_CFG_BUFLEN(lcfg, 1));
+	class_import_put(imp);
+
+	rc = client_import_add_conn(imp, &server_uuid, 1);
+	if (rc) {
+		CERROR("can't add initial connection\n");
+		goto err_import;
+	}
+
+	cli->cl_import = imp;
+	/* cli->cl_max_mds_{easize,cookiesize} updated by mdc_init_ea_size() */
+	cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
+	cli->cl_max_mds_cookiesize = sizeof(struct llog_cookie);
+
+	if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
+		if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
+			CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
+			       name, obddev->obd_name,
+			       cli->cl_target_uuid.uuid);
+			spin_lock(&imp->imp_lock);
+			imp->imp_deactive = 1;
+			spin_unlock(&imp->imp_lock);
+		}
+	}
+
+	obddev->obd_namespace = ldlm_namespace_new(obddev, obddev->obd_name,
+						   LDLM_NAMESPACE_CLIENT,
+						   LDLM_NAMESPACE_GREEDY,
+						   ns_type);
+	if (obddev->obd_namespace == NULL) {
+		CERROR("Unable to create client namespace - %s\n",
+		       obddev->obd_name);
+		rc = -ENOMEM;
+		goto err_import;
+	}
+
+	cli->cl_qchk_stat = CL_NOT_QUOTACHECKED;
+
+	return rc;
+
+err_import:
+	class_destroy_import(imp);
+err_ldlm:
+	ldlm_put_ref();
+err:
+	return rc;
+
+}
+EXPORT_SYMBOL(client_obd_setup);
+
+int client_obd_cleanup(struct obd_device *obddev)
+{
+	ldlm_namespace_free_post(obddev->obd_namespace);
+	obddev->obd_namespace = NULL;
+
+	LASSERT(obddev->u.cli.cl_import == NULL);
+
+	ldlm_put_ref();
+	return 0;
+}
+EXPORT_SYMBOL(client_obd_cleanup);
+
+/* ->o_connect() method for client side (OSC and MDC and MGC) */
+int client_connect_import(const struct lu_env *env,
+			  struct obd_export **exp,
+			  struct obd_device *obd, struct obd_uuid *cluuid,
+			  struct obd_connect_data *data, void *localdata)
+{
+	struct client_obd       *cli    = &obd->u.cli;
+	struct obd_import       *imp    = cli->cl_import;
+	struct obd_connect_data *ocd;
+	struct lustre_handle    conn    = { 0 };
+	int		     rc;
+
+	*exp = NULL;
+	down_write(&cli->cl_sem);
+	if (cli->cl_conn_count > 0) {
+		rc = -EALREADY;
+		goto out_sem;
+	}
+
+	rc = class_connect(&conn, obd, cluuid);
+	if (rc)
+		goto out_sem;
+
+	cli->cl_conn_count++;
+	*exp = class_conn2export(&conn);
+
+	LASSERT(obd->obd_namespace);
+
+	imp->imp_dlm_handle = conn;
+	rc = ptlrpc_init_import(imp);
+	if (rc != 0)
+		goto out_ldlm;
+
+	ocd = &imp->imp_connect_data;
+	if (data) {
+		*ocd = *data;
+		imp->imp_connect_flags_orig = data->ocd_connect_flags;
+	}
+
+	rc = ptlrpc_connect_import(imp);
+	if (rc != 0) {
+		LASSERT(imp->imp_state == LUSTRE_IMP_DISCON);
+		goto out_ldlm;
+	}
+	LASSERT(*exp != NULL && (*exp)->exp_connection);
+
+	if (data) {
+		LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
+			 ocd->ocd_connect_flags, "old %#llx, new %#llx\n",
+			 data->ocd_connect_flags, ocd->ocd_connect_flags);
+		data->ocd_connect_flags = ocd->ocd_connect_flags;
+	}
+
+	ptlrpc_pinger_add_import(imp);
+
+	if (rc) {
+out_ldlm:
+		cli->cl_conn_count--;
+		class_disconnect(*exp);
+		*exp = NULL;
+	}
+out_sem:
+	up_write(&cli->cl_sem);
+
+	return rc;
+}
+EXPORT_SYMBOL(client_connect_import);
+
+int client_disconnect_export(struct obd_export *exp)
+{
+	struct obd_device *obd = class_exp2obd(exp);
+	struct client_obd *cli;
+	struct obd_import *imp;
+	int rc = 0, err;
+
+	if (!obd) {
+		CERROR("invalid export for disconnect: exp %p cookie %#llx\n",
+		       exp, exp ? exp->exp_handle.h_cookie : -1);
+		return -EINVAL;
+	}
+
+	cli = &obd->u.cli;
+	imp = cli->cl_import;
+
+	down_write(&cli->cl_sem);
+	CDEBUG(D_INFO, "disconnect %s - %d\n", obd->obd_name,
+	       cli->cl_conn_count);
+
+	if (!cli->cl_conn_count) {
+		CERROR("disconnecting disconnected device (%s)\n",
+		       obd->obd_name);
+		rc = -EINVAL;
+		goto out_disconnect;
+	}
+
+	cli->cl_conn_count--;
+	if (cli->cl_conn_count) {
+		rc = 0;
+		goto out_disconnect;
+	}
+
+	/* Mark import deactivated now, so we don't try to reconnect if any
+	 * of the cleanup RPCs fails (e.g. LDLM cancel, etc).  We don't
+	 * fully deactivate the import, or that would drop all requests. */
+	spin_lock(&imp->imp_lock);
+	imp->imp_deactive = 1;
+	spin_unlock(&imp->imp_lock);
+
+	/* Some non-replayable imports (MDS's OSCs) are pinged, so just
+	 * delete it regardless.  (It's safe to delete an import that was
+	 * never added.) */
+	(void)ptlrpc_pinger_del_import(imp);
+
+	if (obd->obd_namespace != NULL) {
+		/* obd_force == local only */
+		ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
+				       obd->obd_force ? LCF_LOCAL : 0, NULL);
+		ldlm_namespace_free_prior(obd->obd_namespace, imp,
+					  obd->obd_force);
+	}
+
+	/* There's no need to hold sem while disconnecting an import,
+	 * and it may actually cause deadlock in GSS. */
+	up_write(&cli->cl_sem);
+	rc = ptlrpc_disconnect_import(imp, 0);
+	down_write(&cli->cl_sem);
+
+	ptlrpc_invalidate_import(imp);
+
+out_disconnect:
+	/* Use server style - class_disconnect should be always called for
+	 * o_disconnect. */
+	err = class_disconnect(exp);
+	if (!rc && err)
+		rc = err;
+
+	up_write(&cli->cl_sem);
+
+	return rc;
+}
+EXPORT_SYMBOL(client_disconnect_export);
+
+
+/**
+ * Packs current SLV and Limit into \a req.
+ */
+int target_pack_pool_reply(struct ptlrpc_request *req)
+{
+	struct obd_device *obd;
+
+	/* Check that we still have all structures alive as this may
+	 * be some late RPC at shutdown time. */
+	if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
+		     !exp_connect_lru_resize(req->rq_export))) {
+		lustre_msg_set_slv(req->rq_repmsg, 0);
+		lustre_msg_set_limit(req->rq_repmsg, 0);
+		return 0;
+	}
+
+	/* OBD is alive here as export is alive, which we checked above. */
+	obd = req->rq_export->exp_obd;
+
+	read_lock(&obd->obd_pool_lock);
+	lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
+	lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
+	read_unlock(&obd->obd_pool_lock);
+
+	return 0;
+}
+EXPORT_SYMBOL(target_pack_pool_reply);
+
+int target_send_reply_msg(struct ptlrpc_request *req, int rc, int fail_id)
+{
+	if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
+		DEBUG_REQ(D_ERROR, req, "dropping reply");
+		return -ECOMM;
+	}
+
+	if (unlikely(rc)) {
+		DEBUG_REQ(D_NET, req, "processing error (%d)", rc);
+		req->rq_status = rc;
+		return ptlrpc_send_error(req, 1);
+	} else {
+		DEBUG_REQ(D_NET, req, "sending reply");
+	}
+
+	return ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT);
+}
+
+void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
+{
+	struct ptlrpc_service_part *svcpt;
+	int			netrc;
+	struct ptlrpc_reply_state *rs;
+	struct obd_export	 *exp;
+
+	if (req->rq_no_reply)
+		return;
+
+	svcpt = req->rq_rqbd->rqbd_svcpt;
+	rs = req->rq_reply_state;
+	if (rs == NULL || !rs->rs_difficult) {
+		/* no notifiers */
+		target_send_reply_msg(req, rc, fail_id);
+		return;
+	}
+
+	/* must be an export if locks saved */
+	LASSERT(req->rq_export != NULL);
+	/* req/reply consistent */
+	LASSERT(rs->rs_svcpt == svcpt);
+
+	/* "fresh" reply */
+	LASSERT(!rs->rs_scheduled);
+	LASSERT(!rs->rs_scheduled_ever);
+	LASSERT(!rs->rs_handled);
+	LASSERT(!rs->rs_on_net);
+	LASSERT(rs->rs_export == NULL);
+	LASSERT(list_empty(&rs->rs_obd_list));
+	LASSERT(list_empty(&rs->rs_exp_list));
+
+	exp = class_export_get(req->rq_export);
+
+	/* disable reply scheduling while I'm setting up */
+	rs->rs_scheduled = 1;
+	rs->rs_on_net    = 1;
+	rs->rs_xid       = req->rq_xid;
+	rs->rs_transno   = req->rq_transno;
+	rs->rs_export    = exp;
+	rs->rs_opc       = lustre_msg_get_opc(req->rq_reqmsg);
+
+	spin_lock(&exp->exp_uncommitted_replies_lock);
+	CDEBUG(D_NET, "rs transno = %llu, last committed = %llu\n",
+	       rs->rs_transno, exp->exp_last_committed);
+	if (rs->rs_transno > exp->exp_last_committed) {
+		/* not committed already */
+		list_add_tail(&rs->rs_obd_list,
+				  &exp->exp_uncommitted_replies);
+	}
+	spin_unlock(&exp->exp_uncommitted_replies_lock);
+
+	spin_lock(&exp->exp_lock);
+	list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
+	spin_unlock(&exp->exp_lock);
+
+	netrc = target_send_reply_msg(req, rc, fail_id);
+
+	spin_lock(&svcpt->scp_rep_lock);
+
+	atomic_inc(&svcpt->scp_nreps_difficult);
+
+	if (netrc != 0) {
+		/* error sending: reply is off the net.  Also we need +1
+		 * reply ref until ptlrpc_handle_rs() is done
+		 * with the reply state (if the send was successful, there
+		 * would have been +1 ref for the net, which
+		 * reply_out_callback leaves alone) */
+		rs->rs_on_net = 0;
+		ptlrpc_rs_addref(rs);
+	}
+
+	spin_lock(&rs->rs_lock);
+	if (rs->rs_transno <= exp->exp_last_committed ||
+	    (!rs->rs_on_net && !rs->rs_no_ack) ||
+	    list_empty(&rs->rs_exp_list) ||     /* completed already */
+	    list_empty(&rs->rs_obd_list)) {
+		CDEBUG(D_HA, "Schedule reply immediately\n");
+		ptlrpc_dispatch_difficult_reply(rs);
+	} else {
+		list_add(&rs->rs_list, &svcpt->scp_rep_active);
+		rs->rs_scheduled = 0;	/* allow notifier to schedule */
+	}
+	spin_unlock(&rs->rs_lock);
+	spin_unlock(&svcpt->scp_rep_lock);
+}
+EXPORT_SYMBOL(target_send_reply);
+
+ldlm_mode_t lck_compat_array[] = {
+	[LCK_EX]	= LCK_COMPAT_EX,
+	[LCK_PW]	= LCK_COMPAT_PW,
+	[LCK_PR]	= LCK_COMPAT_PR,
+	[LCK_CW]	= LCK_COMPAT_CW,
+	[LCK_CR]	= LCK_COMPAT_CR,
+	[LCK_NL]	= LCK_COMPAT_NL,
+	[LCK_GROUP]	= LCK_COMPAT_GROUP,
+	[LCK_COS]	= LCK_COMPAT_COS,
+};
+
+/**
+ * Rather arbitrary mapping from LDLM error codes to errno values. This should
+ * not escape to the user level.
+ */
+int ldlm_error2errno(ldlm_error_t error)
+{
+	int result;
+
+	switch (error) {
+	case ELDLM_OK:
+		result = 0;
+		break;
+	case ELDLM_LOCK_CHANGED:
+		result = -ESTALE;
+		break;
+	case ELDLM_LOCK_ABORTED:
+		result = -ENAVAIL;
+		break;
+	case ELDLM_LOCK_REPLACED:
+		result = -ESRCH;
+		break;
+	case ELDLM_NO_LOCK_DATA:
+		result = -ENOENT;
+		break;
+	case ELDLM_NAMESPACE_EXISTS:
+		result = -EEXIST;
+		break;
+	case ELDLM_BAD_NAMESPACE:
+		result = -EBADF;
+		break;
+	default:
+		if (((int)error) < 0)  /* cast to signed type */
+			result = error; /* as ldlm_error_t can be unsigned */
+		else {
+			CERROR("Invalid DLM result code: %d\n", error);
+			result = -EPROTO;
+		}
+	}
+	return result;
+}
+EXPORT_SYMBOL(ldlm_error2errno);
+
+/**
+ * Dual to ldlm_error2errno(): maps errno values back to ldlm_error_t.
+ */
+ldlm_error_t ldlm_errno2error(int err_no)
+{
+	int error;
+
+	switch (err_no) {
+	case 0:
+		error = ELDLM_OK;
+		break;
+	case -ESTALE:
+		error = ELDLM_LOCK_CHANGED;
+		break;
+	case -ENAVAIL:
+		error = ELDLM_LOCK_ABORTED;
+		break;
+	case -ESRCH:
+		error = ELDLM_LOCK_REPLACED;
+		break;
+	case -ENOENT:
+		error = ELDLM_NO_LOCK_DATA;
+		break;
+	case -EEXIST:
+		error = ELDLM_NAMESPACE_EXISTS;
+		break;
+	case -EBADF:
+		error = ELDLM_BAD_NAMESPACE;
+		break;
+	default:
+		error = err_no;
+	}
+	return error;
+}
+EXPORT_SYMBOL(ldlm_errno2error);
+
+#if LUSTRE_TRACKS_LOCK_EXP_REFS
+void ldlm_dump_export_locks(struct obd_export *exp)
+{
+	spin_lock(&exp->exp_locks_list_guard);
+	if (!list_empty(&exp->exp_locks_list)) {
+		struct ldlm_lock *lock;
+
+		CERROR("dumping locks for export %p,ignore if the unmount doesn't hang\n",
+		       exp);
+		list_for_each_entry(lock, &exp->exp_locks_list,
+					l_exp_refs_link)
+			LDLM_ERROR(lock, "lock:");
+	}
+	spin_unlock(&exp->exp_locks_list_guard);
+}
+#endif