X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Fstaging%2Flustre%2Flustre%2Fobdclass%2Fobd_config.c;fp=kernel%2Fdrivers%2Fstaging%2Flustre%2Flustre%2Fobdclass%2Fobd_config.c;h=6ce9adc2f11c88a9dd0b087e2ca5f1dbdfae708a;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git

diff --git a/kernel/drivers/staging/lustre/lustre/obdclass/obd_config.c b/kernel/drivers/staging/lustre/lustre/obdclass/obd_config.c
new file mode 100644
index 000000000..6ce9adc2f
--- /dev/null
+++ b/kernel/drivers/staging/lustre/lustre/obdclass/obd_config.c
@@ -0,0 +1,1953 @@
+/*
+ * 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) 2011, 2012, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * lustre/obdclass/obd_config.c
+ *
+ * Config API
+ */
+
+#define DEBUG_SUBSYSTEM S_CLASS
+#include "../include/obd_class.h"
+#include <linux/string.h>
+#include "../include/lustre_log.h"
+#include "../include/lprocfs_status.h"
+#include "../include/lustre_param.h"
+
+#include "llog_internal.h"
+
+static cfs_hash_ops_t uuid_hash_ops;
+static cfs_hash_ops_t nid_hash_ops;
+static cfs_hash_ops_t nid_stat_hash_ops;
+
+/*********** string parsing utils *********/
+
+/* returns 0 if we find this key in the buffer, else 1 */
+int class_find_param(char *buf, char *key, char **valp)
+{
+	char *ptr;
+
+	if (!buf)
+		return 1;
+
+	ptr = strstr(buf, key);
+	if (ptr == NULL)
+		return 1;
+
+	if (valp)
+		*valp = ptr + strlen(key);
+
+	return 0;
+}
+EXPORT_SYMBOL(class_find_param);
+
+/**
+ * Check whether the proc parameter \a param is an old parameter or not from
+ * the array \a ptr which contains the mapping from old parameters to new ones.
+ * If it's an old one, then return the pointer to the cfg_interop_param struc-
+ * ture which contains both the old and new parameters.
+ *
+ * \param param			proc parameter
+ * \param ptr			an array which contains the mapping from
+ *				old parameters to new ones
+ *
+ * \retval valid-pointer	pointer to the cfg_interop_param structure
+ *				which contains the old and new parameters
+ * \retval NULL			\a param or \a ptr is NULL,
+ *				or \a param is not an old parameter
+ */
+struct cfg_interop_param *class_find_old_param(const char *param,
+					       struct cfg_interop_param *ptr)
+{
+	char *value = NULL;
+	int   name_len = 0;
+
+	if (param == NULL || ptr == NULL)
+		return NULL;
+
+	value = strchr(param, '=');
+	if (value == NULL)
+		name_len = strlen(param);
+	else
+		name_len = value - param;
+
+	while (ptr->old_param != NULL) {
+		if (strncmp(param, ptr->old_param, name_len) == 0 &&
+		    name_len == strlen(ptr->old_param))
+			return ptr;
+		ptr++;
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL(class_find_old_param);
+
+/**
+ * Finds a parameter in \a params and copies it to \a copy.
+ *
+ * Leading spaces are skipped. Next space or end of string is the
+ * parameter terminator with the exception that spaces inside single or double
+ * quotes get included into a parameter. The parameter is copied into \a copy
+ * which has to be allocated big enough by a caller, quotes are stripped in
+ * the copy and the copy is terminated by 0.
+ *
+ * On return \a params is set to next parameter or to NULL if last
+ * parameter is returned.
+ *
+ * \retval 0 if parameter is returned in \a copy
+ * \retval 1 otherwise
+ * \retval -EINVAL if unbalanced quota is found
+ */
+int class_get_next_param(char **params, char *copy)
+{
+	char *q1, *q2, *str;
+	int len;
+
+	str = *params;
+	while (*str == ' ')
+		str++;
+
+	if (*str == '\0') {
+		*params = NULL;
+		return 1;
+	}
+
+	while (1) {
+		q1 = strpbrk(str, " '\"");
+		if (q1 == NULL) {
+			len = strlen(str);
+			memcpy(copy, str, len);
+			copy[len] = '\0';
+			*params = NULL;
+			return 0;
+		}
+		len = q1 - str;
+		if (*q1 == ' ') {
+			memcpy(copy, str, len);
+			copy[len] = '\0';
+			*params = str + len;
+			return 0;
+		}
+
+		memcpy(copy, str, len);
+		copy += len;
+
+		/* search for the matching closing quote */
+		str = q1 + 1;
+		q2 = strchr(str, *q1);
+		if (q2 == NULL) {
+			CERROR("Unbalanced quota in parameters: \"%s\"\n",
+			       *params);
+			return -EINVAL;
+		}
+		len = q2 - str;
+		memcpy(copy, str, len);
+		copy += len;
+		str = q2 + 1;
+	}
+	return 1;
+}
+EXPORT_SYMBOL(class_get_next_param);
+
+/* returns 0 if this is the first key in the buffer, else 1.
+   valp points to first char after key. */
+int class_match_param(char *buf, char *key, char **valp)
+{
+	if (!buf)
+		return 1;
+
+	if (memcmp(buf, key, strlen(key)) != 0)
+		return 1;
+
+	if (valp)
+		*valp = buf + strlen(key);
+
+	return 0;
+}
+EXPORT_SYMBOL(class_match_param);
+
+static int parse_nid(char *buf, void *value, int quiet)
+{
+	lnet_nid_t *nid = (lnet_nid_t *)value;
+
+	*nid = libcfs_str2nid(buf);
+	if (*nid != LNET_NID_ANY)
+		return 0;
+
+	if (!quiet)
+		LCONSOLE_ERROR_MSG(0x159, "Can't parse NID '%s'\n", buf);
+	return -EINVAL;
+}
+
+static int parse_net(char *buf, void *value)
+{
+	__u32 *net = (__u32 *)value;
+
+	*net = libcfs_str2net(buf);
+	CDEBUG(D_INFO, "Net %s\n", libcfs_net2str(*net));
+	return 0;
+}
+
+enum {
+	CLASS_PARSE_NID = 1,
+	CLASS_PARSE_NET,
+};
+
+/* 0 is good nid,
+   1 not found
+   < 0 error
+   endh is set to next separator */
+static int class_parse_value(char *buf, int opc, void *value, char **endh,
+			     int quiet)
+{
+	char *endp;
+	char  tmp;
+	int   rc = 0;
+
+	if (!buf)
+		return 1;
+	while (*buf == ',' || *buf == ':')
+		buf++;
+	if (*buf == ' ' || *buf == '/' || *buf == '\0')
+		return 1;
+
+	/* nid separators or end of nids */
+	endp = strpbrk(buf, ",: /");
+	if (endp == NULL)
+		endp = buf + strlen(buf);
+
+	tmp = *endp;
+	*endp = '\0';
+	switch (opc) {
+	default:
+		LBUG();
+	case CLASS_PARSE_NID:
+		rc = parse_nid(buf, value, quiet);
+		break;
+	case CLASS_PARSE_NET:
+		rc = parse_net(buf, value);
+		break;
+	}
+	*endp = tmp;
+	if (rc != 0)
+		return rc;
+	if (endh)
+		*endh = endp;
+	return 0;
+}
+
+int class_parse_nid(char *buf, lnet_nid_t *nid, char **endh)
+{
+	return class_parse_value(buf, CLASS_PARSE_NID, (void *)nid, endh, 0);
+}
+EXPORT_SYMBOL(class_parse_nid);
+
+int class_parse_nid_quiet(char *buf, lnet_nid_t *nid, char **endh)
+{
+	return class_parse_value(buf, CLASS_PARSE_NID, (void *)nid, endh, 1);
+}
+EXPORT_SYMBOL(class_parse_nid_quiet);
+
+int class_parse_net(char *buf, __u32 *net, char **endh)
+{
+	return class_parse_value(buf, CLASS_PARSE_NET, (void *)net, endh, 0);
+}
+EXPORT_SYMBOL(class_parse_net);
+
+/* 1 param contains key and match
+ * 0 param contains key and not match
+ * -1 param does not contain key
+ */
+int class_match_nid(char *buf, char *key, lnet_nid_t nid)
+{
+	lnet_nid_t tmp;
+	int   rc = -1;
+
+	while (class_find_param(buf, key, &buf) == 0) {
+		/* please restrict to the nids pertaining to
+		 * the specified nids */
+		while (class_parse_nid(buf, &tmp, &buf) == 0) {
+			if (tmp == nid)
+				return 1;
+		}
+		rc = 0;
+	}
+	return rc;
+}
+EXPORT_SYMBOL(class_match_nid);
+
+int class_match_net(char *buf, char *key, __u32 net)
+{
+	__u32 tmp;
+	int   rc = -1;
+
+	while (class_find_param(buf, key, &buf) == 0) {
+		/* please restrict to the nids pertaining to
+		 * the specified networks */
+		while (class_parse_net(buf, &tmp, &buf) == 0) {
+			if (tmp == net)
+				return 1;
+		}
+		rc = 0;
+	}
+	return rc;
+}
+EXPORT_SYMBOL(class_match_net);
+
+/********************** class fns **********************/
+
+/**
+ * Create a new obd device and set the type, name and uuid.  If successful,
+ * the new device can be accessed by either name or uuid.
+ */
+int class_attach(struct lustre_cfg *lcfg)
+{
+	struct obd_device *obd = NULL;
+	char *typename, *name, *uuid;
+	int rc, len;
+
+	if (!LUSTRE_CFG_BUFLEN(lcfg, 1)) {
+		CERROR("No type passed!\n");
+		return -EINVAL;
+	}
+	typename = lustre_cfg_string(lcfg, 1);
+
+	if (!LUSTRE_CFG_BUFLEN(lcfg, 0)) {
+		CERROR("No name passed!\n");
+		return -EINVAL;
+	}
+	name = lustre_cfg_string(lcfg, 0);
+
+	if (!LUSTRE_CFG_BUFLEN(lcfg, 2)) {
+		CERROR("No UUID passed!\n");
+		return -EINVAL;
+	}
+	uuid = lustre_cfg_string(lcfg, 2);
+
+	CDEBUG(D_IOCTL, "attach type %s name: %s uuid: %s\n",
+	       MKSTR(typename), MKSTR(name), MKSTR(uuid));
+
+	obd = class_newdev(typename, name);
+	if (IS_ERR(obd)) {
+		/* Already exists or out of obds */
+		rc = PTR_ERR(obd);
+		obd = NULL;
+		CERROR("Cannot create device %s of type %s : %d\n",
+		       name, typename, rc);
+		goto out;
+	}
+	LASSERTF(obd != NULL, "Cannot get obd device %s of type %s\n",
+		 name, typename);
+	LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
+		 "obd %p obd_magic %08X != %08X\n",
+		 obd, obd->obd_magic, OBD_DEVICE_MAGIC);
+	LASSERTF(strncmp(obd->obd_name, name, strlen(name)) == 0,
+		 "%p obd_name %s != %s\n", obd, obd->obd_name, name);
+
+	rwlock_init(&obd->obd_pool_lock);
+	obd->obd_pool_limit = 0;
+	obd->obd_pool_slv = 0;
+
+	INIT_LIST_HEAD(&obd->obd_exports);
+	INIT_LIST_HEAD(&obd->obd_unlinked_exports);
+	INIT_LIST_HEAD(&obd->obd_delayed_exports);
+	INIT_LIST_HEAD(&obd->obd_exports_timed);
+	INIT_LIST_HEAD(&obd->obd_nid_stats);
+	spin_lock_init(&obd->obd_nid_lock);
+	spin_lock_init(&obd->obd_dev_lock);
+	mutex_init(&obd->obd_dev_mutex);
+	spin_lock_init(&obd->obd_osfs_lock);
+	/* obd->obd_osfs_age must be set to a value in the distant
+	 * past to guarantee a fresh statfs is fetched on mount. */
+	obd->obd_osfs_age = cfs_time_shift_64(-1000);
+
+	/* XXX belongs in setup not attach  */
+	init_rwsem(&obd->obd_observer_link_sem);
+	/* recovery data */
+	cfs_init_timer(&obd->obd_recovery_timer);
+	spin_lock_init(&obd->obd_recovery_task_lock);
+	init_waitqueue_head(&obd->obd_next_transno_waitq);
+	init_waitqueue_head(&obd->obd_evict_inprogress_waitq);
+	INIT_LIST_HEAD(&obd->obd_req_replay_queue);
+	INIT_LIST_HEAD(&obd->obd_lock_replay_queue);
+	INIT_LIST_HEAD(&obd->obd_final_req_queue);
+	INIT_LIST_HEAD(&obd->obd_evict_list);
+
+	llog_group_init(&obd->obd_olg, FID_SEQ_LLOG);
+
+	obd->obd_conn_inprogress = 0;
+
+	len = strlen(uuid);
+	if (len >= sizeof(obd->obd_uuid)) {
+		CERROR("uuid must be < %d bytes long\n",
+		       (int)sizeof(obd->obd_uuid));
+		rc = -EINVAL;
+		goto out;
+	}
+	memcpy(obd->obd_uuid.uuid, uuid, len);
+
+	/* do the attach */
+	if (OBP(obd, attach)) {
+		rc = OBP(obd, attach)(obd, sizeof(*lcfg), lcfg);
+		if (rc) {
+			rc = -EINVAL;
+			goto out;
+		}
+	}
+
+	/* Detach drops this */
+	spin_lock(&obd->obd_dev_lock);
+	atomic_set(&obd->obd_refcount, 1);
+	spin_unlock(&obd->obd_dev_lock);
+	lu_ref_init(&obd->obd_reference);
+	lu_ref_add(&obd->obd_reference, "attach", obd);
+
+	obd->obd_attached = 1;
+	CDEBUG(D_IOCTL, "OBD: dev %d attached type %s with refcount %d\n",
+	       obd->obd_minor, typename, atomic_read(&obd->obd_refcount));
+	return 0;
+ out:
+	if (obd != NULL) {
+		class_release_dev(obd);
+	}
+	return rc;
+}
+EXPORT_SYMBOL(class_attach);
+
+/** Create hashes, self-export, and call type-specific setup.
+ * Setup is effectively the "start this obd" call.
+ */
+int class_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
+{
+	int err = 0;
+	struct obd_export *exp;
+
+	LASSERT(obd != NULL);
+	LASSERTF(obd == class_num2obd(obd->obd_minor),
+		 "obd %p != obd_devs[%d] %p\n",
+		 obd, obd->obd_minor, class_num2obd(obd->obd_minor));
+	LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
+		 "obd %p obd_magic %08x != %08x\n",
+		 obd, obd->obd_magic, OBD_DEVICE_MAGIC);
+
+	/* have we attached a type to this device? */
+	if (!obd->obd_attached) {
+		CERROR("Device %d not attached\n", obd->obd_minor);
+		return -ENODEV;
+	}
+
+	if (obd->obd_set_up) {
+		CERROR("Device %d already setup (type %s)\n",
+		       obd->obd_minor, obd->obd_type->typ_name);
+		return -EEXIST;
+	}
+
+	/* is someone else setting us up right now? (attach inits spinlock) */
+	spin_lock(&obd->obd_dev_lock);
+	if (obd->obd_starting) {
+		spin_unlock(&obd->obd_dev_lock);
+		CERROR("Device %d setup in progress (type %s)\n",
+		       obd->obd_minor, obd->obd_type->typ_name);
+		return -EEXIST;
+	}
+	/* just leave this on forever.  I can't use obd_set_up here because
+	   other fns check that status, and we're not actually set up yet. */
+	obd->obd_starting = 1;
+	obd->obd_uuid_hash = NULL;
+	obd->obd_nid_hash = NULL;
+	obd->obd_nid_stats_hash = NULL;
+	spin_unlock(&obd->obd_dev_lock);
+
+	/* create an uuid-export lustre hash */
+	obd->obd_uuid_hash = cfs_hash_create("UUID_HASH",
+					     HASH_UUID_CUR_BITS,
+					     HASH_UUID_MAX_BITS,
+					     HASH_UUID_BKT_BITS, 0,
+					     CFS_HASH_MIN_THETA,
+					     CFS_HASH_MAX_THETA,
+					     &uuid_hash_ops, CFS_HASH_DEFAULT);
+	if (!obd->obd_uuid_hash) {
+		err = -ENOMEM;
+		goto err_hash;
+	}
+
+	/* create a nid-export lustre hash */
+	obd->obd_nid_hash = cfs_hash_create("NID_HASH",
+					    HASH_NID_CUR_BITS,
+					    HASH_NID_MAX_BITS,
+					    HASH_NID_BKT_BITS, 0,
+					    CFS_HASH_MIN_THETA,
+					    CFS_HASH_MAX_THETA,
+					    &nid_hash_ops, CFS_HASH_DEFAULT);
+	if (!obd->obd_nid_hash) {
+		err = -ENOMEM;
+		goto err_hash;
+	}
+
+	/* create a nid-stats lustre hash */
+	obd->obd_nid_stats_hash = cfs_hash_create("NID_STATS",
+						  HASH_NID_STATS_CUR_BITS,
+						  HASH_NID_STATS_MAX_BITS,
+						  HASH_NID_STATS_BKT_BITS, 0,
+						  CFS_HASH_MIN_THETA,
+						  CFS_HASH_MAX_THETA,
+						  &nid_stat_hash_ops, CFS_HASH_DEFAULT);
+	if (!obd->obd_nid_stats_hash) {
+		err = -ENOMEM;
+		goto err_hash;
+	}
+
+	exp = class_new_export(obd, &obd->obd_uuid);
+	if (IS_ERR(exp)) {
+		err = PTR_ERR(exp);
+		goto err_hash;
+	}
+
+	obd->obd_self_export = exp;
+	list_del_init(&exp->exp_obd_chain_timed);
+	class_export_put(exp);
+
+	err = obd_setup(obd, lcfg);
+	if (err)
+		goto err_exp;
+
+	obd->obd_set_up = 1;
+
+	spin_lock(&obd->obd_dev_lock);
+	/* cleanup drops this */
+	class_incref(obd, "setup", obd);
+	spin_unlock(&obd->obd_dev_lock);
+
+	CDEBUG(D_IOCTL, "finished setup of obd %s (uuid %s)\n",
+	       obd->obd_name, obd->obd_uuid.uuid);
+
+	return 0;
+err_exp:
+	if (obd->obd_self_export) {
+		class_unlink_export(obd->obd_self_export);
+		obd->obd_self_export = NULL;
+	}
+err_hash:
+	if (obd->obd_uuid_hash) {
+		cfs_hash_putref(obd->obd_uuid_hash);
+		obd->obd_uuid_hash = NULL;
+	}
+	if (obd->obd_nid_hash) {
+		cfs_hash_putref(obd->obd_nid_hash);
+		obd->obd_nid_hash = NULL;
+	}
+	if (obd->obd_nid_stats_hash) {
+		cfs_hash_putref(obd->obd_nid_stats_hash);
+		obd->obd_nid_stats_hash = NULL;
+	}
+	obd->obd_starting = 0;
+	CERROR("setup %s failed (%d)\n", obd->obd_name, err);
+	return err;
+}
+EXPORT_SYMBOL(class_setup);
+
+/** We have finished using this obd and are ready to destroy it.
+ * There can be no more references to this obd.
+ */
+int class_detach(struct obd_device *obd, struct lustre_cfg *lcfg)
+{
+	if (obd->obd_set_up) {
+		CERROR("OBD device %d still set up\n", obd->obd_minor);
+		return -EBUSY;
+	}
+
+	spin_lock(&obd->obd_dev_lock);
+	if (!obd->obd_attached) {
+		spin_unlock(&obd->obd_dev_lock);
+		CERROR("OBD device %d not attached\n", obd->obd_minor);
+		return -ENODEV;
+	}
+	obd->obd_attached = 0;
+	spin_unlock(&obd->obd_dev_lock);
+
+	CDEBUG(D_IOCTL, "detach on obd %s (uuid %s)\n",
+	       obd->obd_name, obd->obd_uuid.uuid);
+
+	class_decref(obd, "attach", obd);
+	return 0;
+}
+EXPORT_SYMBOL(class_detach);
+
+/** Start shutting down the obd.  There may be in-progress ops when
+ * this is called.  We tell them to start shutting down with a call
+ * to class_disconnect_exports().
+ */
+int class_cleanup(struct obd_device *obd, struct lustre_cfg *lcfg)
+{
+	int err = 0;
+	char *flag;
+
+	OBD_RACE(OBD_FAIL_LDLM_RECOV_CLIENTS);
+
+	if (!obd->obd_set_up) {
+		CERROR("Device %d not setup\n", obd->obd_minor);
+		return -ENODEV;
+	}
+
+	spin_lock(&obd->obd_dev_lock);
+	if (obd->obd_stopping) {
+		spin_unlock(&obd->obd_dev_lock);
+		CERROR("OBD %d already stopping\n", obd->obd_minor);
+		return -ENODEV;
+	}
+	/* Leave this on forever */
+	obd->obd_stopping = 1;
+
+	/* wait for already-arrived-connections to finish. */
+	while (obd->obd_conn_inprogress > 0) {
+		spin_unlock(&obd->obd_dev_lock);
+
+		cond_resched();
+
+		spin_lock(&obd->obd_dev_lock);
+	}
+	spin_unlock(&obd->obd_dev_lock);
+
+	if (lcfg->lcfg_bufcount >= 2 && LUSTRE_CFG_BUFLEN(lcfg, 1) > 0) {
+		for (flag = lustre_cfg_string(lcfg, 1); *flag != 0; flag++)
+			switch (*flag) {
+			case 'F':
+				obd->obd_force = 1;
+				break;
+			case 'A':
+				LCONSOLE_WARN("Failing over %s\n",
+					      obd->obd_name);
+				obd->obd_fail = 1;
+				obd->obd_no_transno = 1;
+				obd->obd_no_recov = 1;
+				if (OBP(obd, iocontrol)) {
+					obd_iocontrol(OBD_IOC_SYNC,
+						      obd->obd_self_export,
+						      0, NULL, NULL);
+				}
+				break;
+			default:
+				CERROR("Unrecognised flag '%c'\n", *flag);
+			}
+	}
+
+	LASSERT(obd->obd_self_export);
+
+	/* The three references that should be remaining are the
+	 * obd_self_export and the attach and setup references. */
+	if (atomic_read(&obd->obd_refcount) > 3) {
+		/* refcount - 3 might be the number of real exports
+		   (excluding self export). But class_incref is called
+		   by other things as well, so don't count on it. */
+		CDEBUG(D_IOCTL, "%s: forcing exports to disconnect: %d\n",
+		       obd->obd_name, atomic_read(&obd->obd_refcount) - 3);
+		dump_exports(obd, 0);
+		class_disconnect_exports(obd);
+	}
+
+	/* Precleanup, we must make sure all exports get destroyed. */
+	err = obd_precleanup(obd, OBD_CLEANUP_EXPORTS);
+	if (err)
+		CERROR("Precleanup %s returned %d\n",
+		       obd->obd_name, err);
+
+	/* destroy an uuid-export hash body */
+	if (obd->obd_uuid_hash) {
+		cfs_hash_putref(obd->obd_uuid_hash);
+		obd->obd_uuid_hash = NULL;
+	}
+
+	/* destroy a nid-export hash body */
+	if (obd->obd_nid_hash) {
+		cfs_hash_putref(obd->obd_nid_hash);
+		obd->obd_nid_hash = NULL;
+	}
+
+	/* destroy a nid-stats hash body */
+	if (obd->obd_nid_stats_hash) {
+		cfs_hash_putref(obd->obd_nid_stats_hash);
+		obd->obd_nid_stats_hash = NULL;
+	}
+
+	class_decref(obd, "setup", obd);
+	obd->obd_set_up = 0;
+
+	return 0;
+}
+EXPORT_SYMBOL(class_cleanup);
+
+struct obd_device *class_incref(struct obd_device *obd,
+				const char *scope, const void *source)
+{
+	lu_ref_add_atomic(&obd->obd_reference, scope, source);
+	atomic_inc(&obd->obd_refcount);
+	CDEBUG(D_INFO, "incref %s (%p) now %d\n", obd->obd_name, obd,
+	       atomic_read(&obd->obd_refcount));
+
+	return obd;
+}
+EXPORT_SYMBOL(class_incref);
+
+void class_decref(struct obd_device *obd, const char *scope, const void *source)
+{
+	int err;
+	int refs;
+
+	spin_lock(&obd->obd_dev_lock);
+	atomic_dec(&obd->obd_refcount);
+	refs = atomic_read(&obd->obd_refcount);
+	spin_unlock(&obd->obd_dev_lock);
+	lu_ref_del(&obd->obd_reference, scope, source);
+
+	CDEBUG(D_INFO, "Decref %s (%p) now %d\n", obd->obd_name, obd, refs);
+
+	if ((refs == 1) && obd->obd_stopping) {
+		/* All exports have been destroyed; there should
+		   be no more in-progress ops by this point.*/
+
+		spin_lock(&obd->obd_self_export->exp_lock);
+		obd->obd_self_export->exp_flags |= exp_flags_from_obd(obd);
+		spin_unlock(&obd->obd_self_export->exp_lock);
+
+		/* note that we'll recurse into class_decref again */
+		class_unlink_export(obd->obd_self_export);
+		return;
+	}
+
+	if (refs == 0) {
+		CDEBUG(D_CONFIG, "finishing cleanup of obd %s (%s)\n",
+		       obd->obd_name, obd->obd_uuid.uuid);
+		LASSERT(!obd->obd_attached);
+		if (obd->obd_stopping) {
+			/* If we're not stopping, we were never set up */
+			err = obd_cleanup(obd);
+			if (err)
+				CERROR("Cleanup %s returned %d\n",
+				       obd->obd_name, err);
+		}
+		if (OBP(obd, detach)) {
+			err = OBP(obd, detach)(obd);
+			if (err)
+				CERROR("Detach returned %d\n", err);
+		}
+		class_release_dev(obd);
+	}
+}
+EXPORT_SYMBOL(class_decref);
+
+/** Add a failover nid location.
+ * Client obd types contact server obd types using this nid list.
+ */
+int class_add_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
+{
+	struct obd_import *imp;
+	struct obd_uuid uuid;
+	int rc;
+
+	if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
+	    LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
+		CERROR("invalid conn_uuid\n");
+		return -EINVAL;
+	}
+	if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
+	    strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME) &&
+	    strcmp(obd->obd_type->typ_name, LUSTRE_OSP_NAME) &&
+	    strcmp(obd->obd_type->typ_name, LUSTRE_LWP_NAME) &&
+	    strcmp(obd->obd_type->typ_name, LUSTRE_MGC_NAME)) {
+		CERROR("can't add connection on non-client dev\n");
+		return -EINVAL;
+	}
+
+	imp = obd->u.cli.cl_import;
+	if (!imp) {
+		CERROR("try to add conn on immature client dev\n");
+		return -EINVAL;
+	}
+
+	obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
+	rc = obd_add_conn(imp, &uuid, lcfg->lcfg_num);
+
+	return rc;
+}
+EXPORT_SYMBOL(class_add_conn);
+
+/** Remove a failover nid location.
+ */
+int class_del_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
+{
+	struct obd_import *imp;
+	struct obd_uuid uuid;
+	int rc;
+
+	if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
+	    LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
+		CERROR("invalid conn_uuid\n");
+		return -EINVAL;
+	}
+	if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
+	    strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME)) {
+		CERROR("can't del connection on non-client dev\n");
+		return -EINVAL;
+	}
+
+	imp = obd->u.cli.cl_import;
+	if (!imp) {
+		CERROR("try to del conn on immature client dev\n");
+		return -EINVAL;
+	}
+
+	obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
+	rc = obd_del_conn(imp, &uuid);
+
+	return rc;
+}
+
+LIST_HEAD(lustre_profile_list);
+
+struct lustre_profile *class_get_profile(const char *prof)
+{
+	struct lustre_profile *lprof;
+
+	list_for_each_entry(lprof, &lustre_profile_list, lp_list) {
+		if (!strcmp(lprof->lp_profile, prof)) {
+			return lprof;
+		}
+	}
+	return NULL;
+}
+EXPORT_SYMBOL(class_get_profile);
+
+/** Create a named "profile".
+ * This defines the mdc and osc names to use for a client.
+ * This also is used to define the lov to be used by a mdt.
+ */
+int class_add_profile(int proflen, char *prof, int osclen, char *osc,
+		      int mdclen, char *mdc)
+{
+	struct lustre_profile *lprof;
+	int err = 0;
+
+	CDEBUG(D_CONFIG, "Add profile %s\n", prof);
+
+	OBD_ALLOC(lprof, sizeof(*lprof));
+	if (lprof == NULL)
+		return -ENOMEM;
+	INIT_LIST_HEAD(&lprof->lp_list);
+
+	LASSERT(proflen == (strlen(prof) + 1));
+	OBD_ALLOC(lprof->lp_profile, proflen);
+	if (lprof->lp_profile == NULL) {
+		err = -ENOMEM;
+		goto out;
+	}
+	memcpy(lprof->lp_profile, prof, proflen);
+
+	LASSERT(osclen == (strlen(osc) + 1));
+	OBD_ALLOC(lprof->lp_dt, osclen);
+	if (lprof->lp_dt == NULL) {
+		err = -ENOMEM;
+		goto out;
+	}
+	memcpy(lprof->lp_dt, osc, osclen);
+
+	if (mdclen > 0) {
+		LASSERT(mdclen == (strlen(mdc) + 1));
+		OBD_ALLOC(lprof->lp_md, mdclen);
+		if (lprof->lp_md == NULL) {
+			err = -ENOMEM;
+			goto out;
+		}
+		memcpy(lprof->lp_md, mdc, mdclen);
+	}
+
+	list_add(&lprof->lp_list, &lustre_profile_list);
+	return err;
+
+out:
+	if (lprof->lp_md)
+		OBD_FREE(lprof->lp_md, mdclen);
+	if (lprof->lp_dt)
+		OBD_FREE(lprof->lp_dt, osclen);
+	if (lprof->lp_profile)
+		OBD_FREE(lprof->lp_profile, proflen);
+	OBD_FREE(lprof, sizeof(*lprof));
+	return err;
+}
+
+void class_del_profile(const char *prof)
+{
+	struct lustre_profile *lprof;
+
+	CDEBUG(D_CONFIG, "Del profile %s\n", prof);
+
+	lprof = class_get_profile(prof);
+	if (lprof) {
+		list_del(&lprof->lp_list);
+		OBD_FREE(lprof->lp_profile, strlen(lprof->lp_profile) + 1);
+		OBD_FREE(lprof->lp_dt, strlen(lprof->lp_dt) + 1);
+		if (lprof->lp_md)
+			OBD_FREE(lprof->lp_md, strlen(lprof->lp_md) + 1);
+		OBD_FREE(lprof, sizeof(*lprof));
+	}
+}
+EXPORT_SYMBOL(class_del_profile);
+
+/* COMPAT_146 */
+void class_del_profiles(void)
+{
+	struct lustre_profile *lprof, *n;
+
+	list_for_each_entry_safe(lprof, n, &lustre_profile_list, lp_list) {
+		list_del(&lprof->lp_list);
+		OBD_FREE(lprof->lp_profile, strlen(lprof->lp_profile) + 1);
+		OBD_FREE(lprof->lp_dt, strlen(lprof->lp_dt) + 1);
+		if (lprof->lp_md)
+			OBD_FREE(lprof->lp_md, strlen(lprof->lp_md) + 1);
+		OBD_FREE(lprof, sizeof(*lprof));
+	}
+}
+EXPORT_SYMBOL(class_del_profiles);
+
+static int class_set_global(char *ptr, int val, struct lustre_cfg *lcfg)
+{
+	if (class_match_param(ptr, PARAM_AT_MIN, NULL) == 0)
+		at_min = val;
+	else if (class_match_param(ptr, PARAM_AT_MAX, NULL) == 0)
+		at_max = val;
+	else if (class_match_param(ptr, PARAM_AT_EXTRA, NULL) == 0)
+		at_extra = val;
+	else if (class_match_param(ptr, PARAM_AT_EARLY_MARGIN, NULL) == 0)
+		at_early_margin = val;
+	else if (class_match_param(ptr, PARAM_AT_HISTORY, NULL) == 0)
+		at_history = val;
+	else if (class_match_param(ptr, PARAM_JOBID_VAR, NULL) == 0)
+		strlcpy(obd_jobid_var, lustre_cfg_string(lcfg, 2),
+			JOBSTATS_JOBID_VAR_MAX_LEN + 1);
+	else
+		return -EINVAL;
+
+	CDEBUG(D_IOCTL, "global %s = %d\n", ptr, val);
+	return 0;
+}
+
+
+/* We can't call ll_process_config or lquota_process_config directly because
+ * it lives in a module that must be loaded after this one. */
+static int (*client_process_config)(struct lustre_cfg *lcfg) = NULL;
+static int (*quota_process_config)(struct lustre_cfg *lcfg) = NULL;
+
+void lustre_register_client_process_config(int (*cpc)(struct lustre_cfg *lcfg))
+{
+	client_process_config = cpc;
+}
+EXPORT_SYMBOL(lustre_register_client_process_config);
+
+/**
+ * Rename the proc parameter in \a cfg with a new name \a new_name.
+ *
+ * \param cfg	   config structure which contains the proc parameter
+ * \param new_name new name of the proc parameter
+ *
+ * \retval valid-pointer    pointer to the newly-allocated config structure
+ *			    which contains the renamed proc parameter
+ * \retval ERR_PTR(-EINVAL) if \a cfg or \a new_name is NULL, or \a cfg does
+ *			    not contain a proc parameter
+ * \retval ERR_PTR(-ENOMEM) if memory allocation failure occurs
+ */
+struct lustre_cfg *lustre_cfg_rename(struct lustre_cfg *cfg,
+				     const char *new_name)
+{
+	struct lustre_cfg_bufs	*bufs = NULL;
+	struct lustre_cfg	*new_cfg = NULL;
+	char			*param = NULL;
+	char			*new_param = NULL;
+	char			*value = NULL;
+	int			 name_len = 0;
+	int			 new_len = 0;
+
+	if (cfg == NULL || new_name == NULL)
+		return ERR_PTR(-EINVAL);
+
+	param = lustre_cfg_string(cfg, 1);
+	if (param == NULL)
+		return ERR_PTR(-EINVAL);
+
+	value = strchr(param, '=');
+	if (value == NULL)
+		name_len = strlen(param);
+	else
+		name_len = value - param;
+
+	new_len = LUSTRE_CFG_BUFLEN(cfg, 1) + strlen(new_name) - name_len;
+
+	OBD_ALLOC(new_param, new_len);
+	if (new_param == NULL)
+		return ERR_PTR(-ENOMEM);
+
+	strcpy(new_param, new_name);
+	if (value != NULL)
+		strcat(new_param, value);
+
+	OBD_ALLOC_PTR(bufs);
+	if (bufs == NULL) {
+		OBD_FREE(new_param, new_len);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	lustre_cfg_bufs_reset(bufs, NULL);
+	lustre_cfg_bufs_init(bufs, cfg);
+	lustre_cfg_bufs_set_string(bufs, 1, new_param);
+
+	new_cfg = lustre_cfg_new(cfg->lcfg_command, bufs);
+
+	OBD_FREE(new_param, new_len);
+	OBD_FREE_PTR(bufs);
+	if (new_cfg == NULL)
+		return ERR_PTR(-ENOMEM);
+
+	new_cfg->lcfg_num = cfg->lcfg_num;
+	new_cfg->lcfg_flags = cfg->lcfg_flags;
+	new_cfg->lcfg_nid = cfg->lcfg_nid;
+	new_cfg->lcfg_nal = cfg->lcfg_nal;
+
+	return new_cfg;
+}
+EXPORT_SYMBOL(lustre_cfg_rename);
+
+static int process_param2_config(struct lustre_cfg *lcfg)
+{
+	char *param = lustre_cfg_string(lcfg, 1);
+	char *upcall = lustre_cfg_string(lcfg, 2);
+	char *argv[] = {
+		[0] = "/usr/sbin/lctl",
+		[1] = "set_param",
+		[2] = param,
+		[3] = NULL
+	};
+	struct timeval	start;
+	struct timeval	end;
+	int		rc;
+
+
+	/* Add upcall processing here. Now only lctl is supported */
+	if (strcmp(upcall, LCTL_UPCALL) != 0) {
+		CERROR("Unsupported upcall %s\n", upcall);
+		return -EINVAL;
+	}
+
+	do_gettimeofday(&start);
+	rc = call_usermodehelper(argv[0], argv, NULL, 1);
+	do_gettimeofday(&end);
+
+	if (rc < 0) {
+		CERROR(
+		       "lctl: error invoking upcall %s %s %s: rc = %d; time %ldus\n",
+		       argv[0], argv[1], argv[2], rc,
+		       cfs_timeval_sub(&end, &start, NULL));
+	} else {
+		CDEBUG(D_HA, "lctl: invoked upcall %s %s %s, time %ldus\n",
+		       argv[0], argv[1], argv[2],
+		       cfs_timeval_sub(&end, &start, NULL));
+		       rc = 0;
+	}
+
+	return rc;
+}
+
+void lustre_register_quota_process_config(int (*qpc)(struct lustre_cfg *lcfg))
+{
+	quota_process_config = qpc;
+}
+EXPORT_SYMBOL(lustre_register_quota_process_config);
+
+/** Process configuration commands given in lustre_cfg form.
+ * These may come from direct calls (e.g. class_manual_cleanup)
+ * or processing the config llog, or ioctl from lctl.
+ */
+int class_process_config(struct lustre_cfg *lcfg)
+{
+	struct obd_device *obd;
+	int err;
+
+	LASSERT(lcfg && !IS_ERR(lcfg));
+	CDEBUG(D_IOCTL, "processing cmd: %x\n", lcfg->lcfg_command);
+
+	/* Commands that don't need a device */
+	switch (lcfg->lcfg_command) {
+	case LCFG_ATTACH: {
+		err = class_attach(lcfg);
+		goto out;
+	}
+	case LCFG_ADD_UUID: {
+		CDEBUG(D_IOCTL, "adding mapping from uuid %s to nid %#llx (%s)\n",
+		       lustre_cfg_string(lcfg, 1), lcfg->lcfg_nid,
+		       libcfs_nid2str(lcfg->lcfg_nid));
+
+		err = class_add_uuid(lustre_cfg_string(lcfg, 1), lcfg->lcfg_nid);
+		goto out;
+	}
+	case LCFG_DEL_UUID: {
+		CDEBUG(D_IOCTL, "removing mappings for uuid %s\n",
+		       (lcfg->lcfg_bufcount < 2 || LUSTRE_CFG_BUFLEN(lcfg, 1) == 0)
+		       ? "<all uuids>" : lustre_cfg_string(lcfg, 1));
+
+		err = class_del_uuid(lustre_cfg_string(lcfg, 1));
+		goto out;
+	}
+	case LCFG_MOUNTOPT: {
+		CDEBUG(D_IOCTL, "mountopt: profile %s osc %s mdc %s\n",
+		       lustre_cfg_string(lcfg, 1),
+		       lustre_cfg_string(lcfg, 2),
+		       lustre_cfg_string(lcfg, 3));
+		/* set these mount options somewhere, so ll_fill_super
+		 * can find them. */
+		err = class_add_profile(LUSTRE_CFG_BUFLEN(lcfg, 1),
+					lustre_cfg_string(lcfg, 1),
+					LUSTRE_CFG_BUFLEN(lcfg, 2),
+					lustre_cfg_string(lcfg, 2),
+					LUSTRE_CFG_BUFLEN(lcfg, 3),
+					lustre_cfg_string(lcfg, 3));
+		goto out;
+	}
+	case LCFG_DEL_MOUNTOPT: {
+		CDEBUG(D_IOCTL, "mountopt: profile %s\n",
+		       lustre_cfg_string(lcfg, 1));
+		class_del_profile(lustre_cfg_string(lcfg, 1));
+		err = 0;
+		goto out;
+	}
+	case LCFG_SET_TIMEOUT: {
+		CDEBUG(D_IOCTL, "changing lustre timeout from %d to %d\n",
+		       obd_timeout, lcfg->lcfg_num);
+		obd_timeout = max(lcfg->lcfg_num, 1U);
+		obd_timeout_set = 1;
+		err = 0;
+		goto out;
+	}
+	case LCFG_SET_LDLM_TIMEOUT: {
+		CDEBUG(D_IOCTL, "changing lustre ldlm_timeout from %d to %d\n",
+		       ldlm_timeout, lcfg->lcfg_num);
+		ldlm_timeout = max(lcfg->lcfg_num, 1U);
+		if (ldlm_timeout >= obd_timeout)
+			ldlm_timeout = max(obd_timeout / 3, 1U);
+		ldlm_timeout_set = 1;
+		err = 0;
+		goto out;
+	}
+	case LCFG_SET_UPCALL: {
+		LCONSOLE_ERROR_MSG(0x15a, "recovery upcall is deprecated\n");
+		/* COMPAT_146 Don't fail on old configs */
+		err = 0;
+		goto out;
+	}
+	case LCFG_MARKER: {
+		struct cfg_marker *marker;
+		marker = lustre_cfg_buf(lcfg, 1);
+		CDEBUG(D_IOCTL, "marker %d (%#x) %.16s %s\n", marker->cm_step,
+		       marker->cm_flags, marker->cm_tgtname, marker->cm_comment);
+		err = 0;
+		goto out;
+	}
+	case LCFG_PARAM: {
+		char *tmp;
+		/* llite has no obd */
+		if ((class_match_param(lustre_cfg_string(lcfg, 1),
+				       PARAM_LLITE, NULL) == 0) &&
+		    client_process_config) {
+			err = (*client_process_config)(lcfg);
+			goto out;
+		} else if ((class_match_param(lustre_cfg_string(lcfg, 1),
+					      PARAM_SYS, &tmp) == 0)) {
+			/* Global param settings */
+			err = class_set_global(tmp, lcfg->lcfg_num, lcfg);
+			/*
+			 * Client or server should not fail to mount if
+			 * it hits an unknown configuration parameter.
+			 */
+			if (err != 0)
+				CWARN("Ignoring unknown param %s\n", tmp);
+
+			err = 0;
+			goto out;
+		} else if ((class_match_param(lustre_cfg_string(lcfg, 1),
+					      PARAM_QUOTA, &tmp) == 0) &&
+			   quota_process_config) {
+			err = (*quota_process_config)(lcfg);
+			goto out;
+		}
+
+		break;
+	}
+	case LCFG_SET_PARAM: {
+		err = process_param2_config(lcfg);
+		goto out;
+	}
+	}
+	/* Commands that require a device */
+	obd = class_name2obd(lustre_cfg_string(lcfg, 0));
+	if (obd == NULL) {
+		if (!LUSTRE_CFG_BUFLEN(lcfg, 0))
+			CERROR("this lcfg command requires a device name\n");
+		else
+			CERROR("no device for: %s\n",
+			       lustre_cfg_string(lcfg, 0));
+
+		err = -EINVAL;
+		goto out;
+	}
+
+	switch (lcfg->lcfg_command) {
+	case LCFG_SETUP: {
+		err = class_setup(obd, lcfg);
+		goto out;
+	}
+	case LCFG_DETACH: {
+		err = class_detach(obd, lcfg);
+		err = 0;
+		goto out;
+	}
+	case LCFG_CLEANUP: {
+		err = class_cleanup(obd, lcfg);
+		err = 0;
+		goto out;
+	}
+	case LCFG_ADD_CONN: {
+		err = class_add_conn(obd, lcfg);
+		err = 0;
+		goto out;
+	}
+	case LCFG_DEL_CONN: {
+		err = class_del_conn(obd, lcfg);
+		err = 0;
+		goto out;
+	}
+	case LCFG_POOL_NEW: {
+		err = obd_pool_new(obd, lustre_cfg_string(lcfg, 2));
+		err = 0;
+		goto out;
+	}
+	case LCFG_POOL_ADD: {
+		err = obd_pool_add(obd, lustre_cfg_string(lcfg, 2),
+				   lustre_cfg_string(lcfg, 3));
+		err = 0;
+		goto out;
+	}
+	case LCFG_POOL_REM: {
+		err = obd_pool_rem(obd, lustre_cfg_string(lcfg, 2),
+				   lustre_cfg_string(lcfg, 3));
+		err = 0;
+		goto out;
+	}
+	case LCFG_POOL_DEL: {
+		err = obd_pool_del(obd, lustre_cfg_string(lcfg, 2));
+		err = 0;
+		goto out;
+	}
+	default: {
+		err = obd_process_config(obd, sizeof(*lcfg), lcfg);
+		goto out;
+
+	}
+	}
+out:
+	if ((err < 0) && !(lcfg->lcfg_command & LCFG_REQUIRED)) {
+		CWARN("Ignoring error %d on optional command %#x\n", err,
+		      lcfg->lcfg_command);
+		err = 0;
+	}
+	return err;
+}
+EXPORT_SYMBOL(class_process_config);
+
+int class_process_proc_param(char *prefix, struct lprocfs_vars *lvars,
+			     struct lustre_cfg *lcfg, void *data)
+{
+	struct lprocfs_vars *var;
+	struct file fakefile;
+	struct seq_file fake_seqfile;
+	char *key, *sval;
+	int i, keylen, vallen;
+	int matched = 0, j = 0;
+	int rc = 0;
+	int skip = 0;
+
+	if (lcfg->lcfg_command != LCFG_PARAM) {
+		CERROR("Unknown command: %d\n", lcfg->lcfg_command);
+		return -EINVAL;
+	}
+
+	/* fake a seq file so that var->fops->write can work... */
+	fakefile.private_data = &fake_seqfile;
+	fake_seqfile.private = data;
+	/* e.g. tunefs.lustre --param mdt.group_upcall=foo /r/tmp/lustre-mdt
+	   or   lctl conf_param lustre-MDT0000.mdt.group_upcall=bar
+	   or   lctl conf_param lustre-OST0000.osc.max_dirty_mb=36 */
+	for (i = 1; i < lcfg->lcfg_bufcount; i++) {
+		key = lustre_cfg_buf(lcfg, i);
+		/* Strip off prefix */
+		class_match_param(key, prefix, &key);
+		sval = strchr(key, '=');
+		if (!sval || (*(sval + 1) == 0)) {
+			CERROR("Can't parse param %s (missing '=')\n", key);
+			/* rc = -EINVAL;	continue parsing other params */
+			continue;
+		}
+		keylen = sval - key;
+		sval++;
+		vallen = strlen(sval);
+		matched = 0;
+		j = 0;
+		/* Search proc entries */
+		while (lvars[j].name) {
+			var = &lvars[j];
+			if (class_match_param(key, (char *)var->name, NULL) == 0
+			    && keylen == strlen(var->name)) {
+				matched++;
+				rc = -EROFS;
+				if (var->fops && var->fops->write) {
+					mm_segment_t oldfs;
+					oldfs = get_fs();
+					set_fs(KERNEL_DS);
+					rc = (var->fops->write)(&fakefile, sval,
+								vallen, NULL);
+					set_fs(oldfs);
+				}
+				break;
+			}
+			j++;
+		}
+		if (!matched) {
+			/* If the prefix doesn't match, return error so we
+			   can pass it down the stack */
+			if (strnchr(key, keylen, '.'))
+			    return -ENOSYS;
+			CERROR("%s: unknown param %s\n",
+			       (char *)lustre_cfg_string(lcfg, 0), key);
+			/* rc = -EINVAL;	continue parsing other params */
+			skip++;
+		} else if (rc < 0) {
+			CERROR("writing proc entry %s err %d\n",
+			       var->name, rc);
+			rc = 0;
+		} else {
+			CDEBUG(D_CONFIG, "%s.%.*s: Set parameter %.*s=%s\n",
+					 lustre_cfg_string(lcfg, 0),
+					 (int)strlen(prefix) - 1, prefix,
+					 (int)(sval - key - 1), key, sval);
+		}
+	}
+
+	if (rc > 0)
+		rc = 0;
+	if (!rc && skip)
+		rc = skip;
+	return rc;
+}
+EXPORT_SYMBOL(class_process_proc_param);
+
+extern int lustre_check_exclusion(struct super_block *sb, char *svname);
+
+/** Parse a configuration llog, doing various manipulations on them
+ * for various reasons, (modifications for compatibility, skip obsolete
+ * records, change uuids, etc), then class_process_config() resulting
+ * net records.
+ */
+int class_config_llog_handler(const struct lu_env *env,
+			      struct llog_handle *handle,
+			      struct llog_rec_hdr *rec, void *data)
+{
+	struct config_llog_instance *clli = data;
+	int cfg_len = rec->lrh_len;
+	char *cfg_buf = (char *) (rec + 1);
+	int rc = 0;
+
+	//class_config_dump_handler(handle, rec, data);
+
+	switch (rec->lrh_type) {
+	case OBD_CFG_REC: {
+		struct lustre_cfg *lcfg, *lcfg_new;
+		struct lustre_cfg_bufs bufs;
+		char *inst_name = NULL;
+		int inst_len = 0;
+		int inst = 0, swab = 0;
+
+		lcfg = (struct lustre_cfg *)cfg_buf;
+		if (lcfg->lcfg_version == __swab32(LUSTRE_CFG_VERSION)) {
+			lustre_swab_lustre_cfg(lcfg);
+			swab = 1;
+		}
+
+		rc = lustre_cfg_sanity_check(cfg_buf, cfg_len);
+		if (rc)
+			goto out;
+
+		/* Figure out config state info */
+		if (lcfg->lcfg_command == LCFG_MARKER) {
+			struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
+			lustre_swab_cfg_marker(marker, swab,
+					       LUSTRE_CFG_BUFLEN(lcfg, 1));
+			CDEBUG(D_CONFIG, "Marker, inst_flg=%#x mark_flg=%#x\n",
+			       clli->cfg_flags, marker->cm_flags);
+			if (marker->cm_flags & CM_START) {
+				/* all previous flags off */
+				clli->cfg_flags = CFG_F_MARKER;
+				if (marker->cm_flags & CM_SKIP) {
+					clli->cfg_flags |= CFG_F_SKIP;
+					CDEBUG(D_CONFIG, "SKIP #%d\n",
+					       marker->cm_step);
+				} else if ((marker->cm_flags & CM_EXCLUDE) ||
+					   (clli->cfg_sb &&
+					    lustre_check_exclusion(clli->cfg_sb,
+							 marker->cm_tgtname))) {
+					clli->cfg_flags |= CFG_F_EXCLUDE;
+					CDEBUG(D_CONFIG, "EXCLUDE %d\n",
+					       marker->cm_step);
+				}
+			} else if (marker->cm_flags & CM_END) {
+				clli->cfg_flags = 0;
+			}
+		}
+		/* A config command without a start marker before it is
+		   illegal (post 146) */
+		if (!(clli->cfg_flags & CFG_F_COMPAT146) &&
+		    !(clli->cfg_flags & CFG_F_MARKER) &&
+		    (lcfg->lcfg_command != LCFG_MARKER)) {
+			CWARN("Config not inside markers, ignoring! (inst: %p, uuid: %s, flags: %#x)\n",
+			      clli->cfg_instance,
+			      clli->cfg_uuid.uuid, clli->cfg_flags);
+			clli->cfg_flags |= CFG_F_SKIP;
+		}
+		if (clli->cfg_flags & CFG_F_SKIP) {
+			CDEBUG(D_CONFIG, "skipping %#x\n",
+			       clli->cfg_flags);
+			rc = 0;
+			/* No processing! */
+			break;
+		}
+
+		/*
+		 * For interoperability between 1.8 and 2.0,
+		 * rename "mds" obd device type to "mdt".
+		 */
+		{
+			char *typename = lustre_cfg_string(lcfg, 1);
+			char *index = lustre_cfg_string(lcfg, 2);
+
+			if ((lcfg->lcfg_command == LCFG_ATTACH && typename &&
+			     strcmp(typename, "mds") == 0)) {
+				CWARN("For 1.8 interoperability, rename obd type from mds to mdt\n");
+				typename[2] = 't';
+			}
+			if ((lcfg->lcfg_command == LCFG_SETUP && index &&
+			     strcmp(index, "type") == 0)) {
+				CDEBUG(D_INFO, "For 1.8 interoperability, set this index to '0'\n");
+				index[0] = '0';
+				index[1] = 0;
+			}
+		}
+
+
+		if (clli->cfg_flags & CFG_F_EXCLUDE) {
+			CDEBUG(D_CONFIG, "cmd: %x marked EXCLUDED\n",
+			       lcfg->lcfg_command);
+			if (lcfg->lcfg_command == LCFG_LOV_ADD_OBD)
+				/* Add inactive instead */
+				lcfg->lcfg_command = LCFG_LOV_ADD_INA;
+		}
+
+		lustre_cfg_bufs_init(&bufs, lcfg);
+
+		if (clli && clli->cfg_instance &&
+		    LUSTRE_CFG_BUFLEN(lcfg, 0) > 0){
+			inst = 1;
+			inst_len = LUSTRE_CFG_BUFLEN(lcfg, 0) +
+				   sizeof(clli->cfg_instance) * 2 + 4;
+			OBD_ALLOC(inst_name, inst_len);
+			if (inst_name == NULL) {
+				rc = -ENOMEM;
+				goto out;
+			}
+			sprintf(inst_name, "%s-%p",
+				lustre_cfg_string(lcfg, 0),
+				clli->cfg_instance);
+			lustre_cfg_bufs_set_string(&bufs, 0, inst_name);
+			CDEBUG(D_CONFIG, "cmd %x, instance name: %s\n",
+			       lcfg->lcfg_command, inst_name);
+		}
+
+		/* we override the llog's uuid for clients, to insure they
+		are unique */
+		if (clli && clli->cfg_instance != NULL &&
+		    lcfg->lcfg_command == LCFG_ATTACH) {
+			lustre_cfg_bufs_set_string(&bufs, 2,
+						   clli->cfg_uuid.uuid);
+		}
+		/*
+		 * sptlrpc config record, we expect 2 data segments:
+		 *  [0]: fs_name/target_name,
+		 *  [1]: rule string
+		 * moving them to index [1] and [2], and insert MGC's
+		 * obdname at index [0].
+		 */
+		if (clli && clli->cfg_instance == NULL &&
+		    lcfg->lcfg_command == LCFG_SPTLRPC_CONF) {
+			lustre_cfg_bufs_set(&bufs, 2, bufs.lcfg_buf[1],
+					    bufs.lcfg_buflen[1]);
+			lustre_cfg_bufs_set(&bufs, 1, bufs.lcfg_buf[0],
+					    bufs.lcfg_buflen[0]);
+			lustre_cfg_bufs_set_string(&bufs, 0,
+						   clli->cfg_obdname);
+		}
+
+		lcfg_new = lustre_cfg_new(lcfg->lcfg_command, &bufs);
+
+		lcfg_new->lcfg_num   = lcfg->lcfg_num;
+		lcfg_new->lcfg_flags = lcfg->lcfg_flags;
+
+		/* XXX Hack to try to remain binary compatible with
+		 * pre-newconfig logs */
+		if (lcfg->lcfg_nal != 0 &&      /* pre-newconfig log? */
+		    (lcfg->lcfg_nid >> 32) == 0) {
+			__u32 addr = (__u32)(lcfg->lcfg_nid & 0xffffffff);
+
+			lcfg_new->lcfg_nid =
+				LNET_MKNID(LNET_MKNET(lcfg->lcfg_nal, 0), addr);
+			CWARN("Converted pre-newconfig NAL %d NID %x to %s\n",
+			      lcfg->lcfg_nal, addr,
+			      libcfs_nid2str(lcfg_new->lcfg_nid));
+		} else {
+			lcfg_new->lcfg_nid = lcfg->lcfg_nid;
+		}
+
+		lcfg_new->lcfg_nal = 0; /* illegal value for obsolete field */
+
+		rc = class_process_config(lcfg_new);
+		lustre_cfg_free(lcfg_new);
+
+		if (inst)
+			OBD_FREE(inst_name, inst_len);
+		break;
+	}
+	default:
+		CERROR("Unknown llog record type %#x encountered\n",
+		       rec->lrh_type);
+		break;
+	}
+out:
+	if (rc) {
+		CERROR("%s: cfg command failed: rc = %d\n",
+		       handle->lgh_ctxt->loc_obd->obd_name, rc);
+		class_config_dump_handler(NULL, handle, rec, data);
+	}
+	return rc;
+}
+EXPORT_SYMBOL(class_config_llog_handler);
+
+int class_config_parse_llog(const struct lu_env *env, struct llog_ctxt *ctxt,
+			    char *name, struct config_llog_instance *cfg)
+{
+	struct llog_process_cat_data	 cd = {0, 0};
+	struct llog_handle		*llh;
+	llog_cb_t			 callback;
+	int				 rc;
+
+	CDEBUG(D_INFO, "looking up llog %s\n", name);
+	rc = llog_open(env, ctxt, &llh, NULL, name, LLOG_OPEN_EXISTS);
+	if (rc)
+		return rc;
+
+	rc = llog_init_handle(env, llh, LLOG_F_IS_PLAIN, NULL);
+	if (rc)
+		goto parse_out;
+
+	/* continue processing from where we last stopped to end-of-log */
+	if (cfg) {
+		cd.lpcd_first_idx = cfg->cfg_last_idx;
+		callback = cfg->cfg_callback;
+		LASSERT(callback != NULL);
+	} else {
+		callback = class_config_llog_handler;
+	}
+
+	cd.lpcd_last_idx = 0;
+
+	rc = llog_process(env, llh, callback, cfg, &cd);
+
+	CDEBUG(D_CONFIG, "Processed log %s gen %d-%d (rc=%d)\n", name,
+	       cd.lpcd_first_idx + 1, cd.lpcd_last_idx, rc);
+	if (cfg)
+		cfg->cfg_last_idx = cd.lpcd_last_idx;
+
+parse_out:
+	llog_close(env, llh);
+	return rc;
+}
+EXPORT_SYMBOL(class_config_parse_llog);
+
+/**
+ * parse config record and output dump in supplied buffer.
+ * This is separated from class_config_dump_handler() to use
+ * for ioctl needs as well
+ */
+int class_config_parse_rec(struct llog_rec_hdr *rec, char *buf, int size)
+{
+	struct lustre_cfg	*lcfg = (struct lustre_cfg *)(rec + 1);
+	char			*ptr = buf;
+	char			*end = buf + size;
+	int			 rc = 0;
+
+	LASSERT(rec->lrh_type == OBD_CFG_REC);
+	rc = lustre_cfg_sanity_check(lcfg, rec->lrh_len);
+	if (rc < 0)
+		return rc;
+
+	ptr += snprintf(ptr, end-ptr, "cmd=%05x ", lcfg->lcfg_command);
+	if (lcfg->lcfg_flags)
+		ptr += snprintf(ptr, end-ptr, "flags=%#08x ",
+				lcfg->lcfg_flags);
+
+	if (lcfg->lcfg_num)
+		ptr += snprintf(ptr, end-ptr, "num=%#08x ", lcfg->lcfg_num);
+
+	if (lcfg->lcfg_nid)
+		ptr += snprintf(ptr, end-ptr, "nid=%s(%#llx)\n     ",
+				libcfs_nid2str(lcfg->lcfg_nid),
+				lcfg->lcfg_nid);
+
+	if (lcfg->lcfg_command == LCFG_MARKER) {
+		struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
+
+		ptr += snprintf(ptr, end-ptr, "marker=%d(%#x)%s '%s'",
+				marker->cm_step, marker->cm_flags,
+				marker->cm_tgtname, marker->cm_comment);
+	} else {
+		int i;
+
+		for (i = 0; i <  lcfg->lcfg_bufcount; i++) {
+			ptr += snprintf(ptr, end-ptr, "%d:%s  ", i,
+					lustre_cfg_string(lcfg, i));
+		}
+	}
+	/* return consumed bytes */
+	rc = ptr - buf;
+	return rc;
+}
+
+int class_config_dump_handler(const struct lu_env *env,
+			      struct llog_handle *handle,
+			      struct llog_rec_hdr *rec, void *data)
+{
+	char	*outstr;
+	int	 rc = 0;
+
+	OBD_ALLOC(outstr, 256);
+	if (outstr == NULL)
+		return -ENOMEM;
+
+	if (rec->lrh_type == OBD_CFG_REC) {
+		class_config_parse_rec(rec, outstr, 256);
+		LCONSOLE(D_WARNING, "   %s\n", outstr);
+	} else {
+		LCONSOLE(D_WARNING, "unhandled lrh_type: %#x\n", rec->lrh_type);
+		rc = -EINVAL;
+	}
+
+	OBD_FREE(outstr, 256);
+	return rc;
+}
+
+int class_config_dump_llog(const struct lu_env *env, struct llog_ctxt *ctxt,
+			   char *name, struct config_llog_instance *cfg)
+{
+	struct llog_handle	*llh;
+	int			 rc;
+
+	LCONSOLE_INFO("Dumping config log %s\n", name);
+
+	rc = llog_open(env, ctxt, &llh, NULL, name, LLOG_OPEN_EXISTS);
+	if (rc)
+		return rc;
+
+	rc = llog_init_handle(env, llh, LLOG_F_IS_PLAIN, NULL);
+	if (rc)
+		goto parse_out;
+
+	rc = llog_process(env, llh, class_config_dump_handler, cfg, NULL);
+parse_out:
+	llog_close(env, llh);
+
+	LCONSOLE_INFO("End config log %s\n", name);
+	return rc;
+}
+EXPORT_SYMBOL(class_config_dump_llog);
+
+/** Call class_cleanup and class_detach.
+ * "Manual" only in the sense that we're faking lcfg commands.
+ */
+int class_manual_cleanup(struct obd_device *obd)
+{
+	char		    flags[3] = "";
+	struct lustre_cfg      *lcfg;
+	struct lustre_cfg_bufs  bufs;
+	int		     rc;
+
+	if (!obd) {
+		CERROR("empty cleanup\n");
+		return -EALREADY;
+	}
+
+	if (obd->obd_force)
+		strcat(flags, "F");
+	if (obd->obd_fail)
+		strcat(flags, "A");
+
+	CDEBUG(D_CONFIG, "Manual cleanup of %s (flags='%s')\n",
+	       obd->obd_name, flags);
+
+	lustre_cfg_bufs_reset(&bufs, obd->obd_name);
+	lustre_cfg_bufs_set_string(&bufs, 1, flags);
+	lcfg = lustre_cfg_new(LCFG_CLEANUP, &bufs);
+	if (!lcfg)
+		return -ENOMEM;
+
+	rc = class_process_config(lcfg);
+	if (rc) {
+		CERROR("cleanup failed %d: %s\n", rc, obd->obd_name);
+		goto out;
+	}
+
+	/* the lcfg is almost the same for both ops */
+	lcfg->lcfg_command = LCFG_DETACH;
+	rc = class_process_config(lcfg);
+	if (rc)
+		CERROR("detach failed %d: %s\n", rc, obd->obd_name);
+out:
+	lustre_cfg_free(lcfg);
+	return rc;
+}
+EXPORT_SYMBOL(class_manual_cleanup);
+
+/*
+ * uuid<->export lustre hash operations
+ */
+
+static unsigned
+uuid_hash(struct cfs_hash *hs, const void *key, unsigned mask)
+{
+	return cfs_hash_djb2_hash(((struct obd_uuid *)key)->uuid,
+				  sizeof(((struct obd_uuid *)key)->uuid), mask);
+}
+
+static void *
+uuid_key(struct hlist_node *hnode)
+{
+	struct obd_export *exp;
+
+	exp = hlist_entry(hnode, struct obd_export, exp_uuid_hash);
+
+	return &exp->exp_client_uuid;
+}
+
+/*
+ * NOTE: It is impossible to find an export that is in failed
+ *       state with this function
+ */
+static int
+uuid_keycmp(const void *key, struct hlist_node *hnode)
+{
+	struct obd_export *exp;
+
+	LASSERT(key);
+	exp = hlist_entry(hnode, struct obd_export, exp_uuid_hash);
+
+	return obd_uuid_equals(key, &exp->exp_client_uuid) &&
+	       !exp->exp_failed;
+}
+
+static void *
+uuid_export_object(struct hlist_node *hnode)
+{
+	return hlist_entry(hnode, struct obd_export, exp_uuid_hash);
+}
+
+static void
+uuid_export_get(struct cfs_hash *hs, struct hlist_node *hnode)
+{
+	struct obd_export *exp;
+
+	exp = hlist_entry(hnode, struct obd_export, exp_uuid_hash);
+	class_export_get(exp);
+}
+
+static void
+uuid_export_put_locked(struct cfs_hash *hs, struct hlist_node *hnode)
+{
+	struct obd_export *exp;
+
+	exp = hlist_entry(hnode, struct obd_export, exp_uuid_hash);
+	class_export_put(exp);
+}
+
+static cfs_hash_ops_t uuid_hash_ops = {
+	.hs_hash	= uuid_hash,
+	.hs_key	 = uuid_key,
+	.hs_keycmp      = uuid_keycmp,
+	.hs_object      = uuid_export_object,
+	.hs_get	 = uuid_export_get,
+	.hs_put_locked  = uuid_export_put_locked,
+};
+
+
+/*
+ * nid<->export hash operations
+ */
+
+static unsigned
+nid_hash(struct cfs_hash *hs, const void *key, unsigned mask)
+{
+	return cfs_hash_djb2_hash(key, sizeof(lnet_nid_t), mask);
+}
+
+static void *
+nid_key(struct hlist_node *hnode)
+{
+	struct obd_export *exp;
+
+	exp = hlist_entry(hnode, struct obd_export, exp_nid_hash);
+
+	return &exp->exp_connection->c_peer.nid;
+}
+
+/*
+ * NOTE: It is impossible to find an export that is in failed
+ *       state with this function
+ */
+static int
+nid_kepcmp(const void *key, struct hlist_node *hnode)
+{
+	struct obd_export *exp;
+
+	LASSERT(key);
+	exp = hlist_entry(hnode, struct obd_export, exp_nid_hash);
+
+	return exp->exp_connection->c_peer.nid == *(lnet_nid_t *)key &&
+	       !exp->exp_failed;
+}
+
+static void *
+nid_export_object(struct hlist_node *hnode)
+{
+	return hlist_entry(hnode, struct obd_export, exp_nid_hash);
+}
+
+static void
+nid_export_get(struct cfs_hash *hs, struct hlist_node *hnode)
+{
+	struct obd_export *exp;
+
+	exp = hlist_entry(hnode, struct obd_export, exp_nid_hash);
+	class_export_get(exp);
+}
+
+static void
+nid_export_put_locked(struct cfs_hash *hs, struct hlist_node *hnode)
+{
+	struct obd_export *exp;
+
+	exp = hlist_entry(hnode, struct obd_export, exp_nid_hash);
+	class_export_put(exp);
+}
+
+static cfs_hash_ops_t nid_hash_ops = {
+	.hs_hash	= nid_hash,
+	.hs_key	 = nid_key,
+	.hs_keycmp      = nid_kepcmp,
+	.hs_object      = nid_export_object,
+	.hs_get	 = nid_export_get,
+	.hs_put_locked  = nid_export_put_locked,
+};
+
+
+/*
+ * nid<->nidstats hash operations
+ */
+
+static void *
+nidstats_key(struct hlist_node *hnode)
+{
+	struct nid_stat *ns;
+
+	ns = hlist_entry(hnode, struct nid_stat, nid_hash);
+
+	return &ns->nid;
+}
+
+static int
+nidstats_keycmp(const void *key, struct hlist_node *hnode)
+{
+	return *(lnet_nid_t *)nidstats_key(hnode) == *(lnet_nid_t *)key;
+}
+
+static void *
+nidstats_object(struct hlist_node *hnode)
+{
+	return hlist_entry(hnode, struct nid_stat, nid_hash);
+}
+
+static void
+nidstats_get(struct cfs_hash *hs, struct hlist_node *hnode)
+{
+	struct nid_stat *ns;
+
+	ns = hlist_entry(hnode, struct nid_stat, nid_hash);
+	nidstat_getref(ns);
+}
+
+static void
+nidstats_put_locked(struct cfs_hash *hs, struct hlist_node *hnode)
+{
+	struct nid_stat *ns;
+
+	ns = hlist_entry(hnode, struct nid_stat, nid_hash);
+	nidstat_putref(ns);
+}
+
+static cfs_hash_ops_t nid_stat_hash_ops = {
+	.hs_hash	= nid_hash,
+	.hs_key	 = nidstats_key,
+	.hs_keycmp      = nidstats_keycmp,
+	.hs_object      = nidstats_object,
+	.hs_get	 = nidstats_get,
+	.hs_put_locked  = nidstats_put_locked,
+};