/*
 * 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;

/*********** 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);
        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;
        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;
        }

        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;
        }
        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;
        }

        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);

        lprof = kzalloc(sizeof(*lprof), GFP_NOFS);
        if (lprof == NULL)
                return -ENOMEM;
        INIT_LIST_HEAD(&lprof->lp_list);

        LASSERT(proflen == (strlen(prof) + 1));
        lprof->lp_profile = kmemdup(prof, proflen, GFP_NOFS);
        if (lprof->lp_profile == NULL) {
                err = -ENOMEM;
                goto free_lprof;
        }

        LASSERT(osclen == (strlen(osc) + 1));
        lprof->lp_dt = kmemdup(osc, osclen, GFP_NOFS);
        if (lprof->lp_dt == NULL) {
                err = -ENOMEM;
                goto free_lp_profile;
        }

        if (mdclen > 0) {
                LASSERT(mdclen == (strlen(mdc) + 1));
                lprof->lp_md = kmemdup(mdc, mdclen, GFP_NOFS);
                if (lprof->lp_md == NULL) {
                        err = -ENOMEM;
                        goto free_lp_dt;
                }
        }

        list_add(&lprof->lp_list, &lustre_profile_list);
        return err;

free_lp_dt:
        kfree(lprof->lp_dt);
free_lp_profile:
        kfree(lprof->lp_profile);
free_lprof:
        kfree(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);
                kfree(lprof->lp_profile);
                kfree(lprof->lp_dt);
                kfree(lprof->lp_md);
                kfree(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);
                kfree(lprof->lp_profile);
                kfree(lprof->lp_dt);
                kfree(lprof->lp_md);
                kfree(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;

        new_param = kzalloc(new_len, GFP_NOFS);
        if (new_param == NULL)
                return ERR_PTR(-ENOMEM);

        strcpy(new_param, new_name);
        if (value != NULL)
                strcat(new_param, value);

        bufs = kzalloc(sizeof(*bufs), GFP_NOFS);
        if (bufs == NULL) {
                kfree(new_param);
                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);

        kfree(new_param);
        kfree(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;
                        inst_name = kzalloc(inst_len, GFP_NOFS);
                        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)
                        kfree(inst_name);
                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;

        outstr = kzalloc(256, GFP_NOFS);
        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;
        }

        kfree(outstr);
        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,
};