X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=blobdiff_plain;f=lustre%2Fobdclass%2Fgenops.c;h=fcc57a5fe10ead74ad28ed89312f279b216c1759;hp=982fc35b7eb0224eaffcd99a949e44bd17e02b2e;hb=400b0681017091fab9cef9bd00e0f536e1793dcc;hpb=8bb299c93313daad5d14e4b08b0a672eda144214

diff --git a/lustre/obdclass/genops.c b/lustre/obdclass/genops.c
index 982fc35..fcc57a5 100644
--- a/lustre/obdclass/genops.c
+++ b/lustre/obdclass/genops.c
@@ -1,209 +1,574 @@
-/*
- *  linux/fs/sim_obd/sim_obd.c
+/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
+ * vim:expandtab:shiftwidth=8:tabstop=8:
+ *
+ * lustre/obdclass/genops.c
+ * Copyright (C) 2001-2002  Cluster File Systems, Inc.
  *
- * These are the only exported functions; they provide the simulated object-
- * oriented disk.
+ * This code is issued under the GNU General Public License.
+ * See the file COPYING in this distribution
+ *
+ * These are the only exported functions, they provide some generic
+ * infrastructure for managing object devices
  *
  */
 
-#include <asm/uaccess.h>
-#include <linux/sched.h>
-#include <linux/stat.h>
-#include <linux/string.h>
-#include <linux/locks.h>
-#include <linux/quotaops.h>
-#include <linux/list.h>
-#include <linux/file.h>
-#include <linux/iobuf.h>
-#include <asm/bitops.h>
-#include <asm/byteorder.h>
-#include <linux/obd_support.h>
+#define DEBUG_SUBSYSTEM S_CLASS
+#include <linux/kmod.h>   /* for request_module() */
+#include <linux/module.h>
 #include <linux/obd_class.h>
+#include <linux/random.h>
+#include <linux/slab.h>
+#include <linux/lprocfs_status.h>
 
+extern struct list_head obd_types;
+kmem_cache_t *obdo_cachep = NULL;
+kmem_cache_t *import_cachep = NULL;
+kmem_cache_t *export_cachep = NULL;
 
-extern struct obd_device obd_dev[MAX_OBD_DEVICES];
+int (*ptlrpc_put_connection_superhack)(struct ptlrpc_connection *c);
 
-/* map connection to client */
-struct obd_client *gen_client(int cli_id)
+/* I would prefer if these next four functions were in ptlrpc, to be honest,
+ * but obdclass uses them for the netregression ioctls. -phil */
+static int sync_io_timeout(void *data)
 {
-	struct obd_device * obddev;
-	struct list_head * lh, * next;
-	struct obd_client * cli;
-	int a;
+        struct io_cb_data *cbd = data;
+        struct ptlrpc_bulk_desc *desc;
+        ENTRY;
+
+        LASSERT(cbd);
+        desc = cbd->desc;
+
+        if (!desc) {
+                CERROR("no desc for timed-out BRW, reopen Bugzilla 214!\n");
+                RETURN(0); /* back to sleep -- someone had better wake us up! */
+        }
+
+        LASSERT(desc->bd_connection);
+
+        CERROR("IO of %d pages to/from %s:%d (conn %p) timed out\n",
+               desc->bd_page_count, desc->bd_connection->c_remote_uuid,
+               desc->bd_portal, desc->bd_connection);
+        desc->bd_connection->c_level = LUSTRE_CONN_RECOVD;
+        desc->bd_flags |= PTL_RPC_FL_TIMEOUT;
+        if (desc->bd_connection && class_signal_connection_failure) {
+                class_signal_connection_failure(desc->bd_connection);
+
+                /* We go back to sleep, until we're resumed or interrupted. */
+                RETURN(0);
+        }
+
+        /* If we can't be recovered, just abort the syscall with -ETIMEDOUT. */
+        RETURN(1);
+}
 
-	for (a = 0; a < MAX_OBD_DEVICES; a++) {
-		obddev = &obd_dev[a];
+static int sync_io_intr(void *data)
+{
+        struct io_cb_data *cbd = data;
+        struct ptlrpc_bulk_desc *desc = cbd->desc;
 
-		lh = next = &obddev->obd_gen_clients;
-		while ((lh = lh->next) != &obddev->obd_gen_clients) {
-			cli = list_entry(lh, struct obd_client, cli_chain);
-			
-			if (cli->cli_id == cli_id)
-				return cli;
-		}
-	}
+        ENTRY;
+        desc->bd_flags |= PTL_RPC_FL_INTR;
+        RETURN(1); /* ignored, as of this writing */
+}
 
-	return NULL;
-} /* obd_client */
+int ll_sync_io_cb(struct io_cb_data *data, int err, int phase)
+{
+        int ret;
+        ENTRY;
+
+        if (phase == CB_PHASE_START) {
+                struct l_wait_info lwi;
+                lwi = LWI_TIMEOUT_INTR(obd_timeout * HZ, sync_io_timeout,
+                                       sync_io_intr, data);
+                ret = l_wait_event(data->waitq, data->complete, &lwi);
+                if (atomic_dec_and_test(&data->refcount))
+                        OBD_FREE(data, sizeof(*data));
+                if (ret == -EINTR)
+                        RETURN(ret);
+        } else if (phase == CB_PHASE_FINISH) {
+                data->err = err;
+                data->complete = 1;
+                wake_up(&data->waitq);
+                if (atomic_dec_and_test(&data->refcount))
+                        OBD_FREE(data, sizeof(*data));
+                RETURN(err);
+        } else                
+                LBUG();
+        EXIT;
+        return 0;
+}
 
+struct io_cb_data *ll_init_cb(void)
+{
+        struct io_cb_data *d;
+
+        OBD_ALLOC(d, sizeof(*d));
+        if (d) {
+                init_waitqueue_head(&d->waitq);
+                atomic_set(&d->refcount, 2);
+        }
+        RETURN(d);
+}
 
+/*
+ * support functions: we could use inter-module communication, but this
+ * is more portable to other OS's
+ */
+static struct obd_type *class_search_type(char *nm)
+{
+        struct list_head *tmp;
+        struct obd_type *type;
+        CDEBUG(D_INFO, "SEARCH %s\n", nm);
+
+        tmp = &obd_types;
+        list_for_each(tmp, &obd_types) {
+                type = list_entry(tmp, struct obd_type, typ_chain);
+                CDEBUG(D_INFO, "TYP %s\n", type->typ_name);
+                if (strlen(type->typ_name) == strlen(nm) &&
+                    strcmp(type->typ_name, nm) == 0 ) {
+                        return type;
+                }
+        }
+        return NULL;
+}
 
-/* a connection defines a context in which preallocation can be managed. */ 
-int gen_connect (struct obd_device *obddev, 
-			struct obd_conn_info * conninfo)
+struct obd_type *class_nm_to_type(char *nm)
 {
-	struct obd_client * cli;
+        struct obd_type *type = class_search_type(nm);
+
+#ifdef CONFIG_KMOD
+        if ( !type ) {
+                if ( !request_module(nm) ) {
+                        CDEBUG(D_INFO, "Loaded module '%s'\n", nm);
+                        type = class_search_type(nm);
+                } else {
+                        CDEBUG(D_INFO, "Can't load module '%s'\n", nm);
+                }
+        }
+#endif
+        return type;
+}
 
-	OBD_ALLOC(cli, struct obd_client *, sizeof(struct obd_client));
-	if ( !cli ) {
-		printk("obd_connect (minor %d): no memory!\n", 
-		       obddev->obd_minor);
-		return -ENOMEM;
-	}
+int class_register_type(struct obd_ops *ops, struct lprocfs_vars* vars, char *nm)
+{
+        struct obd_type *type;
+        int rc;
+
+        ENTRY;
+
+        if (class_search_type(nm)) {
+                CDEBUG(D_IOCTL, "Type %s already registered\n", nm);
+                RETURN(-EEXIST);
+        }
+
+        OBD_ALLOC(type, sizeof(*type));
+        OBD_ALLOC(type->typ_ops, sizeof(*type->typ_ops));
+        OBD_ALLOC(type->typ_name, strlen(nm) + 1);
+        if (!type)
+                RETURN(-ENOMEM);
+        INIT_LIST_HEAD(&type->typ_chain);
+        CDEBUG(D_INFO, "MOD_INC_USE for register_type: count = %d\n",
+               atomic_read(&(THIS_MODULE)->uc.usecount));
+        MOD_INC_USE_COUNT;
+        list_add(&type->typ_chain, &obd_types);
+        memcpy(type->typ_ops, ops, sizeof(*type->typ_ops));
+        strcpy(type->typ_name, nm);
+        rc = lprocfs_reg_class(type, (lprocfs_vars_t *)vars, (void*)type);
+        if(rc)
+                RETURN(rc);
+        
+        RETURN(0);
+}
+
+int class_unregister_type(char *nm)
+{
+        struct obd_type *type = class_nm_to_type(nm);
+
+        ENTRY;
+
+        if (!type) {
+                CERROR("unknown obd type\n");
+                RETURN(-EINVAL);
+        }
+
+        if (type->typ_refcnt) {
+                CERROR("type %s has refcount (%d)\n", nm, type->typ_refcnt);
+                /* This is a bad situation, let's make the best of it */
+                /* Remove ops, but leave the name for debugging */
+                OBD_FREE(type->typ_ops, sizeof(*type->typ_ops));
+                RETURN(-EBUSY);
+        }
+        if(type->typ_procroot)
+                lprocfs_dereg_class(type);
+
+        list_del(&type->typ_chain);
+        OBD_FREE(type->typ_name, strlen(nm) + 1);
+        if (type->typ_ops != NULL)
+                OBD_FREE(type->typ_ops, sizeof(*type->typ_ops));
+        OBD_FREE(type, sizeof(*type));
+        CDEBUG(D_INFO, "MOD_DEC_USE for register_type: count = %d\n",
+               atomic_read(&(THIS_MODULE)->uc.usecount) - 1);
+        MOD_DEC_USE_COUNT;
+        RETURN(0);
+} /* class_unregister_type */
+
+int class_name2dev(char *name)
+{
+        int res = -1;
+        int i;
 
-	INIT_LIST_HEAD(&cli->cli_prealloc_inodes);
-	/* this should probably spinlocked? */
-	cli->cli_id = ++obddev->obd_gen_last_id;
-	cli->cli_prealloc_quota = 0;
-	cli->cli_obd = obddev;
-	list_add(&(cli->cli_chain), obddev->obd_gen_clients.prev);
+        if (!name)
+                return -1;
 
-	CDEBUG(D_IOCTL, "connect: new ID %u\n", cli->cli_id);
-	conninfo->conn_id = cli->cli_id;
-	return 0;
-} /* gen_obd_connect */
+        for (i=0; i < MAX_OBD_DEVICES; i++) {
+                struct obd_device *obd = &obd_dev[i];
+                if (obd->obd_name && strcmp(name, obd->obd_name) == 0) {
+                        res = i;
+                        return res;
+                }
+        }
 
+        return res;
+}
 
-int gen_disconnect(unsigned int conn_id)
+int class_uuid2dev(char *uuid)
 {
-	struct obd_client * cli;
+        int res = -1;
+        int i;
+
+        for (i=0; i < MAX_OBD_DEVICES; i++) {
+                struct obd_device *obd = &obd_dev[i];
+                if (strncmp(uuid, obd->obd_uuid, sizeof(obd->obd_uuid)) == 0) {
+                        res = i;
+                        return res;
+                }
+        }
+
+        return res;
+}
 
-	ENTRY;
 
-	if (!(cli = gen_client(conn_id))) {
-		CDEBUG(D_IOCTL, "disconnect: attempting to free "
-		       "nonexistent client %u\n", conn_id);
-		return -EINVAL;
-	}
+struct obd_device *class_uuid2obd(char *uuid)
+{
+        int i;
 
-	list_del(&(cli->cli_chain));
-	OBD_FREE(cli, sizeof(struct obd_client));
+        for (i=0; i < MAX_OBD_DEVICES; i++) {
+                struct obd_device *obd = &obd_dev[i];
+                if (strncmp(uuid, obd->obd_uuid, sizeof(obd->obd_uuid)) == 0)
+                        return obd;
+        }
 
-	CDEBUG(D_IOCTL, "disconnect: ID %u\n", conn_id);
+        return NULL;
+}
+
+void obd_cleanup_caches(void)
+{
+        int rc;
+        ENTRY;
+        if (obdo_cachep) {
+                rc = kmem_cache_destroy(obdo_cachep);
+                if (rc)
+                        CERROR("Cannot destory ll_obdo_cache\n");
+                obdo_cachep = NULL;
+        }
+        if (import_cachep) {
+                rc = kmem_cache_destroy(import_cachep);
+                if (rc)
+                        CERROR("Cannot destory ll_import_cache\n");
+                import_cachep = NULL;
+        }
+        if (export_cachep) {
+                rc = kmem_cache_destroy(export_cachep);
+                if (rc)
+                        CERROR("Cannot destory ll_export_cache\n");
+                export_cachep = NULL;
+        }
+        EXIT;
+}
 
-	EXIT;
-	return 0;
-} /* gen_obd_disconnect */
+int obd_init_caches(void)
+{
+        ENTRY;
+        LASSERT(obdo_cachep == NULL);
+        obdo_cachep = kmem_cache_create("ll_obdo_cache", sizeof(struct obdo),
+                                        0, 0, NULL, NULL);
+        if (!obdo_cachep)
+                GOTO(out, -ENOMEM);
+
+        LASSERT(export_cachep == NULL);
+        export_cachep = kmem_cache_create("ll_export_cache",
+                                          sizeof(struct obd_export),
+                                          0, 0, NULL, NULL);
+        if (!export_cachep)
+                GOTO(out, -ENOMEM);
+
+        LASSERT(import_cachep == NULL);
+        import_cachep = kmem_cache_create("ll_import_cache",
+                                          sizeof(struct obd_import),
+                                          0, 0, NULL, NULL);
+        if (!import_cachep)
+                GOTO(out, -ENOMEM);
+
+        RETURN(0);
+ out:
+        obd_cleanup_caches();
+        RETURN(-ENOMEM);
+
+}
 
+/* map connection to client */
+struct obd_export *class_conn2export(struct lustre_handle *conn)
+{
+        struct obd_export *export;
+
+        if (!conn) {
+                CDEBUG(D_CACHE, "looking for null handle\n");
+                RETURN(NULL);
+        }
+
+        if (conn->addr == -1) {  /* this means assign a new connection */
+                CDEBUG(D_CACHE, "want a new connection\n");
+                RETURN(NULL);
+        }
+
+        if (!conn->addr) {
+                CDEBUG(D_CACHE, "looking for null addr\n");
+                fixme();
+                RETURN(NULL);
+        }
+
+        CDEBUG(D_IOCTL, "looking for export addr "LPX64" cookie "LPX64"\n",
+               conn->addr, conn->cookie);
+        export = (struct obd_export *) (unsigned long)conn->addr;
+        if (!kmem_cache_validate(export_cachep, (void *)export))
+                RETURN(NULL);
+
+        if (export->exp_cookie != conn->cookie)
+                RETURN(NULL);
+        RETURN(export);
+} /* class_conn2export */
+
+struct obd_device *class_conn2obd(struct lustre_handle *conn)
+{
+        struct obd_export *export;
+        export = class_conn2export(conn);
+        if (export)
+                return export->exp_obd;
+        fixme();
+        return NULL;
+}
 
-/* 
- *   raid1 defines a number of connections to child devices,
- *   used to make calls to these devices.
- *   data holds nothing
- */ 
-int gen_multi_setup(struct obd_device *obddev, int len, void *data)
+struct obd_import *class_conn2cliimp(struct lustre_handle *conn)
 {
-	int i;
-	struct obd_device *rdev = obddev->obd_multi_dev[0];
+        return &class_conn2obd(conn)->u.cli.cl_import;
+}
 
-	for (i = 0 ; i < obddev->obd_multi_count ; i++ ) {
-		int rc;
-		struct obd_device *child = rdev + i;
-		rc  = OBP(child, connect)(child, &rdev->obd_multi_conns[i]);
+struct obd_import *class_conn2ldlmimp(struct lustre_handle *conn)
+{
+        return &class_conn2export(conn)->exp_ldlm_data.led_import;
+}
 
-		if ( rc != 0 ) {
-			/* XXX disconnect others */
-			return -EINVAL;
-		}
-	}		
-	return 0;
+struct obd_export *class_new_export(struct obd_device *obddev)
+{
+        struct obd_export * export;
+
+        export = kmem_cache_alloc(export_cachep, GFP_KERNEL);
+        if (!export) {
+                CERROR("no memory! (minor %d)\n", obddev->obd_minor);
+                return NULL;
+        }
+
+        memset(export, 0, sizeof(*export));
+        get_random_bytes(&export->exp_cookie, sizeof(export->exp_cookie));
+        export->exp_obd = obddev;
+        /* XXX this should be in LDLM init */
+        INIT_LIST_HEAD(&export->exp_ldlm_data.led_held_locks);
+        INIT_LIST_HEAD(&export->exp_conn_chain);
+        spin_lock(&obddev->obd_dev_lock);
+        list_add(&export->exp_obd_chain, &export->exp_obd->obd_exports);
+        spin_unlock(&obddev->obd_dev_lock);
+        return export;
 }
 
-int gen_multi_cleanup(struct obd_device * obddev)
+void class_destroy_export(struct obd_export *exp)
 {
-	int i;
-	struct obd_device **rdev = obddev->obd_multi_dev;
+        ENTRY;
 
-	for (i = 0 ; i < obddev->obd_multi_count ; i++ ) {
-		int rc;
-		struct obd_device *child = *(rdev + i);
-		rc  = OBP(child, cleanup)(child);
-		*(rdev + i) = NULL;
+        LASSERT(exp->exp_cookie != DEAD_HANDLE_MAGIC);
 
-		if ( rc != 0 ) {
-			/* XXX disconnect others */
-			return -EINVAL;
-		}
-	}
-	gen_cleanup(obddev);
-	return 0;
-} /* sim_cleanup_obddev */
+        spin_lock(&exp->exp_obd->obd_dev_lock);
+        list_del(&exp->exp_obd_chain);
+        spin_unlock(&exp->exp_obd->obd_dev_lock);
 
+        /* XXXshaver no connection here... */
+        if (exp->exp_connection)
+                spin_lock(&exp->exp_connection->c_lock);
+        list_del(&exp->exp_conn_chain);
+        if (exp->exp_connection) {
+                spin_unlock(&exp->exp_connection->c_lock);
+                ptlrpc_put_connection_superhack(exp->exp_connection);
+        }
 
-int gen_multi_attach(struct obd_device *obddev, int len, void *data)
-{
-	int i;
-	int count;
-	struct obd_device *rdev = obddev->obd_multi_dev[0];
+        exp->exp_cookie = DEAD_HANDLE_MAGIC;
+        kmem_cache_free(export_cachep, exp);
 
-	count = len/sizeof(int);
-	obddev->obd_multi_count = count;
-	for (i=0 ; i<count ; i++) {
-		rdev = &obd_dev[*((int *)data + i)];
-		rdev = rdev + 1;
-		CDEBUG(D_IOCTL, "OBD RAID1: replicator %d is of type %s\n", i,
-		       (rdev + i)->obd_type->typ_name);
-	}
-	return 0;
+        EXIT;
 }
 
+/* a connection defines an export context in which preallocation can
+   be managed. */
+int class_connect(struct lustre_handle *conn, struct obd_device *obd,
+                  obd_uuid_t cluuid)
+{
+        struct obd_export * export;
+        if (conn == NULL) {
+                LBUG();
+                return -EINVAL;
+        }
+
+        if (obd == NULL) {
+                LBUG();
+                return -EINVAL;
+        }
+
+        export = class_new_export(obd);
+        if (!export)
+                return -ENOMEM;
+
+        conn->addr = (__u64) (unsigned long)export;
+        conn->cookie = export->exp_cookie;
+
+        CDEBUG(D_IOCTL, "connect: addr %Lx cookie %Lx\n",
+               (long long)conn->addr, (long long)conn->cookie);
+        return 0;
+}
 
-
-/*
- *    remove all connections to this device
- *    close all connections to lower devices
- *    needed for forced unloads of OBD client drivers
- */
-int gen_multi_cleanup_device(struct obd_device *obddev)
+int class_disconnect(struct lustre_handle *conn)
 {
-	int i;
-	struct obd_device **rdev;
+        struct obd_export *export;
+        ENTRY;
 
-	rdev =  obddev->obd_multi_dev;
-	for (i = 0 ; i < obddev->obd_multi_count ; i++ ) {
-		int rc;
-		struct obd_device *child = *(rdev + i);
-		rc  = OBP(child, disconnect)
-			(obddev->obd_multi_conns[i].conn_id);
+        if (!(export = class_conn2export(conn))) {
+                fixme();
+                CDEBUG(D_IOCTL, "disconnect: attempting to free "
+                       "nonexistent client "LPX64"\n", conn->addr);
+                RETURN(-EINVAL);
+        }
 
-		if ( rc != 0 ) {
-			printk("OBD multi cleanup dev: disconnect failure %d\n", child->obd_minor);
-		}
-		*(rdev + i) = NULL;
-	}		
-	return 0;
-} /* gen_multi_cleanup_device */
+        CDEBUG(D_IOCTL, "disconnect: addr %Lx cookie %Lx\n",
+                       (long long)conn->addr, (long long)conn->cookie);
 
+        class_destroy_export(export);
 
-/*
- *    forced cleanup of the device:
- *    - remove connections from the device
- *    - cleanup the device afterwards
- */
-int gen_cleanup(struct obd_device * obddev)
+        RETURN(0);
+}
+
+void class_disconnect_all(struct obd_device *obddev)
 {
-	struct list_head * lh, * tmp;
-	struct obd_client * cli;
+        int again = 1;
+
+        while (again) {
+                spin_lock(&obddev->obd_dev_lock);
+                if (!list_empty(&obddev->obd_exports)) {
+                        struct obd_export *export;
+                        struct lustre_handle conn;
+                        int rc;
+
+                        export = list_entry(obddev->obd_exports.next,
+                                            struct obd_export,
+                                            exp_obd_chain);
+                        conn.addr = (__u64)(unsigned long)export;
+                        conn.cookie = export->exp_cookie;
+                        spin_unlock(&obddev->obd_dev_lock);
+                        CERROR("force disconnecting export %p\n", export);
+                        rc = obd_disconnect(&conn);
+                        if (rc < 0) {
+                                /* AED: not so sure about this...  We can't
+                                 * loop here forever, yet we shouldn't leak
+                                 * exports on a struct we will soon destroy.
+                                 */
+                                CERROR("destroy export %p with err: rc = %d\n",
+                                       export, rc);
+                                class_destroy_export(export);
+                        }
+                } else {
+                        spin_unlock(&obddev->obd_dev_lock);
+                        again = 0;
+                }
+        }
+}
 
-	ENTRY;
+#if 0
 
-	lh = tmp = &obddev->obd_gen_clients;
-	while ((tmp = tmp->next) != lh) {
-		cli = list_entry(tmp, struct obd_client, cli_chain);
-		CDEBUG(D_IOCTL, "Disconnecting obd_connection %d, at %p\n",
-		       cli->cli_id, cli);
-		OBP(obddev, disconnect)(cli->cli_id);
-	}
+/* FIXME: Data is a space- or comma-separated list of device IDs.  This will
+ * have to change. */
+int class_multi_setup(struct obd_device *obddev, uint32_t len, void *data)
+{
+        int count, rc;
+        char *p;
+        ENTRY;
+
+        for (p = data, count = 0; p < (char *)data + len; count++) {
+                char *end;
+                int tmp = simple_strtoul(p, &end, 0);
+
+                if (p == end) {
+                        CERROR("invalid device ID starting at: %s\n", p);
+                        GOTO(err_disconnect, rc = -EINVAL);
+                }
+
+                if (tmp < 0 || tmp >= MAX_OBD_DEVICES) {
+                        CERROR("Trying to sub dev %d  - dev no too large\n",
+                               tmp);
+                        GOTO(err_disconnect, rc  = -EINVAL);
+                }
+
+                rc = obd_connect(&obddev->obd_multi_conn[count], &obd_dev[tmp]);
+                if (rc) {
+                        CERROR("cannot connect to device %d: rc = %d\n", tmp,
+                               rc);
+                        GOTO(err_disconnect, rc);
+                }
+
+                CDEBUG(D_INFO, "target OBD %d is of type %s\n", count,
+                       obd_dev[tmp].obd_type->typ_name);
+
+                p = end + 1;
+        }
+
+        obddev->obd_multi_count = count;
+
+        RETURN(0);
+
+ err_disconnect:
+        for (count--; count >= 0; count--)
+                obd_disconnect(&obddev->obd_multi_conn[count]);
+        return rc;
+}
 
-	return OBP(obddev, cleanup_device)(obddev);
-} /* sim_cleanup_device */
+/*
+ *    remove all connections to this device
+ *    close all connections to lower devices
+ *    needed for forced unloads of OBD client drivers
+ */
+int class_multi_cleanup(struct obd_device *obddev)
+{
+        int i;
+
+        for (i = 0; i < obddev->obd_multi_count; i++) {
+                int rc;
+                struct obd_device *obd =
+                        class_conn2obd(&obddev->obd_multi_conn[i]);
+
+                if (!obd) {
+                        CERROR("no such device [i %d]\n", i);
+                        RETURN(-EINVAL);
+                }
+
+                rc = obd_disconnect(&obddev->obd_multi_conn[i]);
+                if (rc)
+                        CERROR("disconnect failure %d\n", obd->obd_minor);
+        }
+        return 0;
+}
+#endif