--- /dev/null
+/*
+ * 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) 1999, 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/genops.c
+ *
+ * These are the only exported functions, they provide some generic
+ * infrastructure for managing object devices
+ */
+
+#define DEBUG_SUBSYSTEM S_CLASS
+#include "../include/obd_class.h"
+#include "../include/lprocfs_status.h"
+
+spinlock_t obd_types_lock;
+
+struct kmem_cache *obd_device_cachep;
+struct kmem_cache *obdo_cachep;
+EXPORT_SYMBOL(obdo_cachep);
+static struct kmem_cache *import_cachep;
+
+static struct list_head obd_zombie_imports;
+static struct list_head obd_zombie_exports;
+static spinlock_t obd_zombie_impexp_lock;
+static void obd_zombie_impexp_notify(void);
+static void obd_zombie_export_add(struct obd_export *exp);
+static void obd_zombie_import_add(struct obd_import *imp);
+static void print_export_data(struct obd_export *exp,
+ const char *status, int locks);
+
+int (*ptlrpc_put_connection_superhack)(struct ptlrpc_connection *c);
+EXPORT_SYMBOL(ptlrpc_put_connection_superhack);
+
+/*
+ * support functions: we could use inter-module communication, but this
+ * is more portable to other OS's
+ */
+static struct obd_device *obd_device_alloc(void)
+{
+ struct obd_device *obd;
+
+ OBD_SLAB_ALLOC_PTR_GFP(obd, obd_device_cachep, GFP_NOFS);
+ if (obd != NULL) {
+ obd->obd_magic = OBD_DEVICE_MAGIC;
+ }
+ return obd;
+}
+
+static void obd_device_free(struct obd_device *obd)
+{
+ LASSERT(obd != NULL);
+ LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "obd %p obd_magic %08x != %08x\n",
+ obd, obd->obd_magic, OBD_DEVICE_MAGIC);
+ if (obd->obd_namespace != NULL) {
+ CERROR("obd %p: namespace %p was not properly cleaned up (obd_force=%d)!\n",
+ obd, obd->obd_namespace, obd->obd_force);
+ LBUG();
+ }
+ lu_ref_fini(&obd->obd_reference);
+ OBD_SLAB_FREE_PTR(obd, obd_device_cachep);
+}
+
+struct obd_type *class_search_type(const char *name)
+{
+ struct list_head *tmp;
+ struct obd_type *type;
+
+ spin_lock(&obd_types_lock);
+ list_for_each(tmp, &obd_types) {
+ type = list_entry(tmp, struct obd_type, typ_chain);
+ if (strcmp(type->typ_name, name) == 0) {
+ spin_unlock(&obd_types_lock);
+ return type;
+ }
+ }
+ spin_unlock(&obd_types_lock);
+ return NULL;
+}
+EXPORT_SYMBOL(class_search_type);
+
+struct obd_type *class_get_type(const char *name)
+{
+ struct obd_type *type = class_search_type(name);
+
+ if (!type) {
+ const char *modname = name;
+
+ if (strcmp(modname, "obdfilter") == 0)
+ modname = "ofd";
+
+ if (strcmp(modname, LUSTRE_LWP_NAME) == 0)
+ modname = LUSTRE_OSP_NAME;
+
+ if (!strncmp(modname, LUSTRE_MDS_NAME, strlen(LUSTRE_MDS_NAME)))
+ modname = LUSTRE_MDT_NAME;
+
+ if (!request_module("%s", modname)) {
+ CDEBUG(D_INFO, "Loaded module '%s'\n", modname);
+ type = class_search_type(name);
+ } else {
+ LCONSOLE_ERROR_MSG(0x158, "Can't load module '%s'\n",
+ modname);
+ }
+ }
+ if (type) {
+ spin_lock(&type->obd_type_lock);
+ type->typ_refcnt++;
+ try_module_get(type->typ_dt_ops->o_owner);
+ spin_unlock(&type->obd_type_lock);
+ }
+ return type;
+}
+EXPORT_SYMBOL(class_get_type);
+
+void class_put_type(struct obd_type *type)
+{
+ LASSERT(type);
+ spin_lock(&type->obd_type_lock);
+ type->typ_refcnt--;
+ module_put(type->typ_dt_ops->o_owner);
+ spin_unlock(&type->obd_type_lock);
+}
+EXPORT_SYMBOL(class_put_type);
+
+#define CLASS_MAX_NAME 1024
+
+int class_register_type(struct obd_ops *dt_ops, struct md_ops *md_ops,
+ struct lprocfs_vars *vars, const char *name,
+ struct lu_device_type *ldt)
+{
+ struct obd_type *type;
+ int rc = 0;
+
+ /* sanity check */
+ LASSERT(strnlen(name, CLASS_MAX_NAME) < CLASS_MAX_NAME);
+
+ if (class_search_type(name)) {
+ CDEBUG(D_IOCTL, "Type %s already registered\n", name);
+ return -EEXIST;
+ }
+
+ rc = -ENOMEM;
+ OBD_ALLOC(type, sizeof(*type));
+ if (type == NULL)
+ return rc;
+
+ OBD_ALLOC_PTR(type->typ_dt_ops);
+ OBD_ALLOC_PTR(type->typ_md_ops);
+ OBD_ALLOC(type->typ_name, strlen(name) + 1);
+
+ if (type->typ_dt_ops == NULL ||
+ type->typ_md_ops == NULL ||
+ type->typ_name == NULL)
+ goto failed;
+
+ *(type->typ_dt_ops) = *dt_ops;
+ /* md_ops is optional */
+ if (md_ops)
+ *(type->typ_md_ops) = *md_ops;
+ strcpy(type->typ_name, name);
+ spin_lock_init(&type->obd_type_lock);
+
+ type->typ_procroot = lprocfs_register(type->typ_name, proc_lustre_root,
+ vars, type);
+ if (IS_ERR(type->typ_procroot)) {
+ rc = PTR_ERR(type->typ_procroot);
+ type->typ_procroot = NULL;
+ goto failed;
+ }
+
+ if (ldt != NULL) {
+ type->typ_lu = ldt;
+ rc = lu_device_type_init(ldt);
+ if (rc != 0)
+ goto failed;
+ }
+
+ spin_lock(&obd_types_lock);
+ list_add(&type->typ_chain, &obd_types);
+ spin_unlock(&obd_types_lock);
+
+ return 0;
+
+ failed:
+ if (type->typ_name != NULL)
+ OBD_FREE(type->typ_name, strlen(name) + 1);
+ if (type->typ_md_ops != NULL)
+ OBD_FREE_PTR(type->typ_md_ops);
+ if (type->typ_dt_ops != NULL)
+ OBD_FREE_PTR(type->typ_dt_ops);
+ OBD_FREE(type, sizeof(*type));
+ return rc;
+}
+EXPORT_SYMBOL(class_register_type);
+
+int class_unregister_type(const char *name)
+{
+ struct obd_type *type = class_search_type(name);
+
+ if (!type) {
+ CERROR("unknown obd type\n");
+ return -EINVAL;
+ }
+
+ if (type->typ_refcnt) {
+ CERROR("type %s has refcount (%d)\n", name, 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_PTR(type->typ_dt_ops);
+ OBD_FREE_PTR(type->typ_md_ops);
+ return -EBUSY;
+ }
+
+ if (type->typ_procroot) {
+ lprocfs_remove(&type->typ_procroot);
+ }
+
+ if (type->typ_lu)
+ lu_device_type_fini(type->typ_lu);
+
+ spin_lock(&obd_types_lock);
+ list_del(&type->typ_chain);
+ spin_unlock(&obd_types_lock);
+ OBD_FREE(type->typ_name, strlen(name) + 1);
+ if (type->typ_dt_ops != NULL)
+ OBD_FREE_PTR(type->typ_dt_ops);
+ if (type->typ_md_ops != NULL)
+ OBD_FREE_PTR(type->typ_md_ops);
+ OBD_FREE(type, sizeof(*type));
+ return 0;
+} /* class_unregister_type */
+EXPORT_SYMBOL(class_unregister_type);
+
+/**
+ * Create a new obd device.
+ *
+ * Find an empty slot in ::obd_devs[], create a new obd device in it.
+ *
+ * \param[in] type_name obd device type string.
+ * \param[in] name obd device name.
+ *
+ * \retval NULL if create fails, otherwise return the obd device
+ * pointer created.
+ */
+struct obd_device *class_newdev(const char *type_name, const char *name)
+{
+ struct obd_device *result = NULL;
+ struct obd_device *newdev;
+ struct obd_type *type = NULL;
+ int i;
+ int new_obd_minor = 0;
+
+ if (strlen(name) >= MAX_OBD_NAME) {
+ CERROR("name/uuid must be < %u bytes long\n", MAX_OBD_NAME);
+ return ERR_PTR(-EINVAL);
+ }
+
+ type = class_get_type(type_name);
+ if (type == NULL){
+ CERROR("OBD: unknown type: %s\n", type_name);
+ return ERR_PTR(-ENODEV);
+ }
+
+ newdev = obd_device_alloc();
+ if (newdev == NULL) {
+ result = ERR_PTR(-ENOMEM);
+ goto out_type;
+ }
+
+ LASSERT(newdev->obd_magic == OBD_DEVICE_MAGIC);
+
+ write_lock(&obd_dev_lock);
+ for (i = 0; i < class_devno_max(); i++) {
+ struct obd_device *obd = class_num2obd(i);
+
+ if (obd && (strcmp(name, obd->obd_name) == 0)) {
+ CERROR("Device %s already exists at %d, won't add\n",
+ name, i);
+ if (result) {
+ LASSERTF(result->obd_magic == OBD_DEVICE_MAGIC,
+ "%p obd_magic %08x != %08x\n", result,
+ result->obd_magic, OBD_DEVICE_MAGIC);
+ LASSERTF(result->obd_minor == new_obd_minor,
+ "%p obd_minor %d != %d\n", result,
+ result->obd_minor, new_obd_minor);
+
+ obd_devs[result->obd_minor] = NULL;
+ result->obd_name[0] = '\0';
+ }
+ result = ERR_PTR(-EEXIST);
+ break;
+ }
+ if (!result && !obd) {
+ result = newdev;
+ result->obd_minor = i;
+ new_obd_minor = i;
+ result->obd_type = type;
+ strncpy(result->obd_name, name,
+ sizeof(result->obd_name) - 1);
+ obd_devs[i] = result;
+ }
+ }
+ write_unlock(&obd_dev_lock);
+
+ if (result == NULL && i >= class_devno_max()) {
+ CERROR("all %u OBD devices used, increase MAX_OBD_DEVICES\n",
+ class_devno_max());
+ result = ERR_PTR(-EOVERFLOW);
+ goto out;
+ }
+
+ if (IS_ERR(result))
+ goto out;
+
+ CDEBUG(D_IOCTL, "Adding new device %s (%p)\n",
+ result->obd_name, result);
+
+ return result;
+out:
+ obd_device_free(newdev);
+out_type:
+ class_put_type(type);
+ return result;
+}
+
+void class_release_dev(struct obd_device *obd)
+{
+ struct obd_type *obd_type = obd->obd_type;
+
+ LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "%p obd_magic %08x != %08x\n",
+ obd, obd->obd_magic, OBD_DEVICE_MAGIC);
+ LASSERTF(obd == obd_devs[obd->obd_minor], "obd %p != obd_devs[%d] %p\n",
+ obd, obd->obd_minor, obd_devs[obd->obd_minor]);
+ LASSERT(obd_type != NULL);
+
+ CDEBUG(D_INFO, "Release obd device %s at %d obd_type name =%s\n",
+ obd->obd_name, obd->obd_minor, obd->obd_type->typ_name);
+
+ write_lock(&obd_dev_lock);
+ obd_devs[obd->obd_minor] = NULL;
+ write_unlock(&obd_dev_lock);
+ obd_device_free(obd);
+
+ class_put_type(obd_type);
+}
+
+int class_name2dev(const char *name)
+{
+ int i;
+
+ if (!name)
+ return -1;
+
+ read_lock(&obd_dev_lock);
+ for (i = 0; i < class_devno_max(); i++) {
+ struct obd_device *obd = class_num2obd(i);
+
+ if (obd && strcmp(name, obd->obd_name) == 0) {
+ /* Make sure we finished attaching before we give
+ out any references */
+ LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
+ if (obd->obd_attached) {
+ read_unlock(&obd_dev_lock);
+ return i;
+ }
+ break;
+ }
+ }
+ read_unlock(&obd_dev_lock);
+
+ return -1;
+}
+EXPORT_SYMBOL(class_name2dev);
+
+struct obd_device *class_name2obd(const char *name)
+{
+ int dev = class_name2dev(name);
+
+ if (dev < 0 || dev > class_devno_max())
+ return NULL;
+ return class_num2obd(dev);
+}
+EXPORT_SYMBOL(class_name2obd);
+
+int class_uuid2dev(struct obd_uuid *uuid)
+{
+ int i;
+
+ read_lock(&obd_dev_lock);
+ for (i = 0; i < class_devno_max(); i++) {
+ struct obd_device *obd = class_num2obd(i);
+
+ if (obd && obd_uuid_equals(uuid, &obd->obd_uuid)) {
+ LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
+ read_unlock(&obd_dev_lock);
+ return i;
+ }
+ }
+ read_unlock(&obd_dev_lock);
+
+ return -1;
+}
+EXPORT_SYMBOL(class_uuid2dev);
+
+struct obd_device *class_uuid2obd(struct obd_uuid *uuid)
+{
+ int dev = class_uuid2dev(uuid);
+ if (dev < 0)
+ return NULL;
+ return class_num2obd(dev);
+}
+EXPORT_SYMBOL(class_uuid2obd);
+
+/**
+ * Get obd device from ::obd_devs[]
+ *
+ * \param num [in] array index
+ *
+ * \retval NULL if ::obd_devs[\a num] does not contains an obd device
+ * otherwise return the obd device there.
+ */
+struct obd_device *class_num2obd(int num)
+{
+ struct obd_device *obd = NULL;
+
+ if (num < class_devno_max()) {
+ obd = obd_devs[num];
+ if (obd == NULL)
+ return NULL;
+
+ LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
+ "%p obd_magic %08x != %08x\n",
+ obd, obd->obd_magic, OBD_DEVICE_MAGIC);
+ LASSERTF(obd->obd_minor == num,
+ "%p obd_minor %0d != %0d\n",
+ obd, obd->obd_minor, num);
+ }
+
+ return obd;
+}
+EXPORT_SYMBOL(class_num2obd);
+
+/**
+ * Get obd devices count. Device in any
+ * state are counted
+ * \retval obd device count
+ */
+int get_devices_count(void)
+{
+ int index, max_index = class_devno_max(), dev_count = 0;
+
+ read_lock(&obd_dev_lock);
+ for (index = 0; index <= max_index; index++) {
+ struct obd_device *obd = class_num2obd(index);
+ if (obd != NULL)
+ dev_count++;
+ }
+ read_unlock(&obd_dev_lock);
+
+ return dev_count;
+}
+EXPORT_SYMBOL(get_devices_count);
+
+void class_obd_list(void)
+{
+ char *status;
+ int i;
+
+ read_lock(&obd_dev_lock);
+ for (i = 0; i < class_devno_max(); i++) {
+ struct obd_device *obd = class_num2obd(i);
+
+ if (obd == NULL)
+ continue;
+ if (obd->obd_stopping)
+ status = "ST";
+ else if (obd->obd_set_up)
+ status = "UP";
+ else if (obd->obd_attached)
+ status = "AT";
+ else
+ status = "--";
+ LCONSOLE(D_CONFIG, "%3d %s %s %s %s %d\n",
+ i, status, obd->obd_type->typ_name,
+ obd->obd_name, obd->obd_uuid.uuid,
+ atomic_read(&obd->obd_refcount));
+ }
+ read_unlock(&obd_dev_lock);
+ return;
+}
+
+/* Search for a client OBD connected to tgt_uuid. If grp_uuid is
+ specified, then only the client with that uuid is returned,
+ otherwise any client connected to the tgt is returned. */
+struct obd_device *class_find_client_obd(struct obd_uuid *tgt_uuid,
+ const char *typ_name,
+ struct obd_uuid *grp_uuid)
+{
+ int i;
+
+ read_lock(&obd_dev_lock);
+ for (i = 0; i < class_devno_max(); i++) {
+ struct obd_device *obd = class_num2obd(i);
+
+ if (obd == NULL)
+ continue;
+ if ((strncmp(obd->obd_type->typ_name, typ_name,
+ strlen(typ_name)) == 0)) {
+ if (obd_uuid_equals(tgt_uuid,
+ &obd->u.cli.cl_target_uuid) &&
+ ((grp_uuid)? obd_uuid_equals(grp_uuid,
+ &obd->obd_uuid) : 1)) {
+ read_unlock(&obd_dev_lock);
+ return obd;
+ }
+ }
+ }
+ read_unlock(&obd_dev_lock);
+
+ return NULL;
+}
+EXPORT_SYMBOL(class_find_client_obd);
+
+/* Iterate the obd_device list looking devices have grp_uuid. Start
+ searching at *next, and if a device is found, the next index to look
+ at is saved in *next. If next is NULL, then the first matching device
+ will always be returned. */
+struct obd_device *class_devices_in_group(struct obd_uuid *grp_uuid, int *next)
+{
+ int i;
+
+ if (next == NULL)
+ i = 0;
+ else if (*next >= 0 && *next < class_devno_max())
+ i = *next;
+ else
+ return NULL;
+
+ read_lock(&obd_dev_lock);
+ for (; i < class_devno_max(); i++) {
+ struct obd_device *obd = class_num2obd(i);
+
+ if (obd == NULL)
+ continue;
+ if (obd_uuid_equals(grp_uuid, &obd->obd_uuid)) {
+ if (next != NULL)
+ *next = i+1;
+ read_unlock(&obd_dev_lock);
+ return obd;
+ }
+ }
+ read_unlock(&obd_dev_lock);
+
+ return NULL;
+}
+EXPORT_SYMBOL(class_devices_in_group);
+
+/**
+ * to notify sptlrpc log for \a fsname has changed, let every relevant OBD
+ * adjust sptlrpc settings accordingly.
+ */
+int class_notify_sptlrpc_conf(const char *fsname, int namelen)
+{
+ struct obd_device *obd;
+ const char *type;
+ int i, rc = 0, rc2;
+
+ LASSERT(namelen > 0);
+
+ read_lock(&obd_dev_lock);
+ for (i = 0; i < class_devno_max(); i++) {
+ obd = class_num2obd(i);
+
+ if (obd == NULL || obd->obd_set_up == 0 || obd->obd_stopping)
+ continue;
+
+ /* only notify mdc, osc, mdt, ost */
+ type = obd->obd_type->typ_name;
+ if (strcmp(type, LUSTRE_MDC_NAME) != 0 &&
+ strcmp(type, LUSTRE_OSC_NAME) != 0 &&
+ strcmp(type, LUSTRE_MDT_NAME) != 0 &&
+ strcmp(type, LUSTRE_OST_NAME) != 0)
+ continue;
+
+ if (strncmp(obd->obd_name, fsname, namelen))
+ continue;
+
+ class_incref(obd, __func__, obd);
+ read_unlock(&obd_dev_lock);
+ rc2 = obd_set_info_async(NULL, obd->obd_self_export,
+ sizeof(KEY_SPTLRPC_CONF),
+ KEY_SPTLRPC_CONF, 0, NULL, NULL);
+ rc = rc ? rc : rc2;
+ class_decref(obd, __func__, obd);
+ read_lock(&obd_dev_lock);
+ }
+ read_unlock(&obd_dev_lock);
+ return rc;
+}
+EXPORT_SYMBOL(class_notify_sptlrpc_conf);
+
+void obd_cleanup_caches(void)
+{
+ if (obd_device_cachep) {
+ kmem_cache_destroy(obd_device_cachep);
+ obd_device_cachep = NULL;
+ }
+ if (obdo_cachep) {
+ kmem_cache_destroy(obdo_cachep);
+ obdo_cachep = NULL;
+ }
+ if (import_cachep) {
+ kmem_cache_destroy(import_cachep);
+ import_cachep = NULL;
+ }
+ if (capa_cachep) {
+ kmem_cache_destroy(capa_cachep);
+ capa_cachep = NULL;
+ }
+}
+
+int obd_init_caches(void)
+{
+ LASSERT(obd_device_cachep == NULL);
+ obd_device_cachep = kmem_cache_create("ll_obd_dev_cache",
+ sizeof(struct obd_device),
+ 0, 0, NULL);
+ if (!obd_device_cachep)
+ goto out;
+
+ LASSERT(obdo_cachep == NULL);
+ obdo_cachep = kmem_cache_create("ll_obdo_cache", sizeof(struct obdo),
+ 0, 0, NULL);
+ if (!obdo_cachep)
+ goto out;
+
+ LASSERT(import_cachep == NULL);
+ import_cachep = kmem_cache_create("ll_import_cache",
+ sizeof(struct obd_import),
+ 0, 0, NULL);
+ if (!import_cachep)
+ goto out;
+
+ LASSERT(capa_cachep == NULL);
+ capa_cachep = kmem_cache_create("capa_cache",
+ sizeof(struct obd_capa), 0, 0, NULL);
+ if (!capa_cachep)
+ goto out;
+
+ 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->cookie == -1) { /* this means assign a new connection */
+ CDEBUG(D_CACHE, "want a new connection\n");
+ return NULL;
+ }
+
+ CDEBUG(D_INFO, "looking for export cookie %#llx\n", conn->cookie);
+ export = class_handle2object(conn->cookie);
+ return export;
+}
+EXPORT_SYMBOL(class_conn2export);
+
+struct obd_device *class_exp2obd(struct obd_export *exp)
+{
+ if (exp)
+ return exp->exp_obd;
+ return NULL;
+}
+EXPORT_SYMBOL(class_exp2obd);
+
+struct obd_device *class_conn2obd(struct lustre_handle *conn)
+{
+ struct obd_export *export;
+ export = class_conn2export(conn);
+ if (export) {
+ struct obd_device *obd = export->exp_obd;
+ class_export_put(export);
+ return obd;
+ }
+ return NULL;
+}
+EXPORT_SYMBOL(class_conn2obd);
+
+struct obd_import *class_exp2cliimp(struct obd_export *exp)
+{
+ struct obd_device *obd = exp->exp_obd;
+ if (obd == NULL)
+ return NULL;
+ return obd->u.cli.cl_import;
+}
+EXPORT_SYMBOL(class_exp2cliimp);
+
+struct obd_import *class_conn2cliimp(struct lustre_handle *conn)
+{
+ struct obd_device *obd = class_conn2obd(conn);
+ if (obd == NULL)
+ return NULL;
+ return obd->u.cli.cl_import;
+}
+EXPORT_SYMBOL(class_conn2cliimp);
+
+/* Export management functions */
+static void class_export_destroy(struct obd_export *exp)
+{
+ struct obd_device *obd = exp->exp_obd;
+
+ LASSERT_ATOMIC_ZERO(&exp->exp_refcount);
+ LASSERT(obd != NULL);
+
+ CDEBUG(D_IOCTL, "destroying export %p/%s for %s\n", exp,
+ exp->exp_client_uuid.uuid, obd->obd_name);
+
+ /* "Local" exports (lctl, LOV->{mdc,osc}) have no connection. */
+ if (exp->exp_connection)
+ ptlrpc_put_connection_superhack(exp->exp_connection);
+
+ LASSERT(list_empty(&exp->exp_outstanding_replies));
+ LASSERT(list_empty(&exp->exp_uncommitted_replies));
+ LASSERT(list_empty(&exp->exp_req_replay_queue));
+ LASSERT(list_empty(&exp->exp_hp_rpcs));
+ obd_destroy_export(exp);
+ class_decref(obd, "export", exp);
+
+ OBD_FREE_RCU(exp, sizeof(*exp), &exp->exp_handle);
+}
+
+static void export_handle_addref(void *export)
+{
+ class_export_get(export);
+}
+
+static struct portals_handle_ops export_handle_ops = {
+ .hop_addref = export_handle_addref,
+ .hop_free = NULL,
+};
+
+struct obd_export *class_export_get(struct obd_export *exp)
+{
+ atomic_inc(&exp->exp_refcount);
+ CDEBUG(D_INFO, "GETting export %p : new refcount %d\n", exp,
+ atomic_read(&exp->exp_refcount));
+ return exp;
+}
+EXPORT_SYMBOL(class_export_get);
+
+void class_export_put(struct obd_export *exp)
+{
+ LASSERT(exp != NULL);
+ LASSERT_ATOMIC_GT_LT(&exp->exp_refcount, 0, LI_POISON);
+ CDEBUG(D_INFO, "PUTting export %p : new refcount %d\n", exp,
+ atomic_read(&exp->exp_refcount) - 1);
+
+ if (atomic_dec_and_test(&exp->exp_refcount)) {
+ LASSERT(!list_empty(&exp->exp_obd_chain));
+ CDEBUG(D_IOCTL, "final put %p/%s\n",
+ exp, exp->exp_client_uuid.uuid);
+
+ /* release nid stat refererence */
+ lprocfs_exp_cleanup(exp);
+
+ obd_zombie_export_add(exp);
+ }
+}
+EXPORT_SYMBOL(class_export_put);
+
+/* Creates a new export, adds it to the hash table, and returns a
+ * pointer to it. The refcount is 2: one for the hash reference, and
+ * one for the pointer returned by this function. */
+struct obd_export *class_new_export(struct obd_device *obd,
+ struct obd_uuid *cluuid)
+{
+ struct obd_export *export;
+ struct cfs_hash *hash = NULL;
+ int rc = 0;
+
+ OBD_ALLOC_PTR(export);
+ if (!export)
+ return ERR_PTR(-ENOMEM);
+
+ export->exp_conn_cnt = 0;
+ export->exp_lock_hash = NULL;
+ export->exp_flock_hash = NULL;
+ atomic_set(&export->exp_refcount, 2);
+ atomic_set(&export->exp_rpc_count, 0);
+ atomic_set(&export->exp_cb_count, 0);
+ atomic_set(&export->exp_locks_count, 0);
+#if LUSTRE_TRACKS_LOCK_EXP_REFS
+ INIT_LIST_HEAD(&export->exp_locks_list);
+ spin_lock_init(&export->exp_locks_list_guard);
+#endif
+ atomic_set(&export->exp_replay_count, 0);
+ export->exp_obd = obd;
+ INIT_LIST_HEAD(&export->exp_outstanding_replies);
+ spin_lock_init(&export->exp_uncommitted_replies_lock);
+ INIT_LIST_HEAD(&export->exp_uncommitted_replies);
+ INIT_LIST_HEAD(&export->exp_req_replay_queue);
+ INIT_LIST_HEAD(&export->exp_handle.h_link);
+ INIT_LIST_HEAD(&export->exp_hp_rpcs);
+ class_handle_hash(&export->exp_handle, &export_handle_ops);
+ export->exp_last_request_time = get_seconds();
+ spin_lock_init(&export->exp_lock);
+ spin_lock_init(&export->exp_rpc_lock);
+ INIT_HLIST_NODE(&export->exp_uuid_hash);
+ INIT_HLIST_NODE(&export->exp_nid_hash);
+ spin_lock_init(&export->exp_bl_list_lock);
+ INIT_LIST_HEAD(&export->exp_bl_list);
+
+ export->exp_sp_peer = LUSTRE_SP_ANY;
+ export->exp_flvr.sf_rpc = SPTLRPC_FLVR_INVALID;
+ export->exp_client_uuid = *cluuid;
+ obd_init_export(export);
+
+ spin_lock(&obd->obd_dev_lock);
+ /* shouldn't happen, but might race */
+ if (obd->obd_stopping) {
+ rc = -ENODEV;
+ goto exit_unlock;
+ }
+
+ hash = cfs_hash_getref(obd->obd_uuid_hash);
+ if (hash == NULL) {
+ rc = -ENODEV;
+ goto exit_unlock;
+ }
+ spin_unlock(&obd->obd_dev_lock);
+
+ if (!obd_uuid_equals(cluuid, &obd->obd_uuid)) {
+ rc = cfs_hash_add_unique(hash, cluuid, &export->exp_uuid_hash);
+ if (rc != 0) {
+ LCONSOLE_WARN("%s: denying duplicate export for %s, %d\n",
+ obd->obd_name, cluuid->uuid, rc);
+ rc = -EALREADY;
+ goto exit_err;
+ }
+ }
+
+ spin_lock(&obd->obd_dev_lock);
+ if (obd->obd_stopping) {
+ cfs_hash_del(hash, cluuid, &export->exp_uuid_hash);
+ rc = -ENODEV;
+ goto exit_unlock;
+ }
+
+ class_incref(obd, "export", export);
+ list_add(&export->exp_obd_chain, &export->exp_obd->obd_exports);
+ list_add_tail(&export->exp_obd_chain_timed,
+ &export->exp_obd->obd_exports_timed);
+ export->exp_obd->obd_num_exports++;
+ spin_unlock(&obd->obd_dev_lock);
+ cfs_hash_putref(hash);
+ return export;
+
+exit_unlock:
+ spin_unlock(&obd->obd_dev_lock);
+exit_err:
+ if (hash)
+ cfs_hash_putref(hash);
+ class_handle_unhash(&export->exp_handle);
+ LASSERT(hlist_unhashed(&export->exp_uuid_hash));
+ obd_destroy_export(export);
+ OBD_FREE_PTR(export);
+ return ERR_PTR(rc);
+}
+EXPORT_SYMBOL(class_new_export);
+
+void class_unlink_export(struct obd_export *exp)
+{
+ class_handle_unhash(&exp->exp_handle);
+
+ spin_lock(&exp->exp_obd->obd_dev_lock);
+ /* delete an uuid-export hashitem from hashtables */
+ if (!hlist_unhashed(&exp->exp_uuid_hash))
+ cfs_hash_del(exp->exp_obd->obd_uuid_hash,
+ &exp->exp_client_uuid,
+ &exp->exp_uuid_hash);
+
+ list_move(&exp->exp_obd_chain, &exp->exp_obd->obd_unlinked_exports);
+ list_del_init(&exp->exp_obd_chain_timed);
+ exp->exp_obd->obd_num_exports--;
+ spin_unlock(&exp->exp_obd->obd_dev_lock);
+ class_export_put(exp);
+}
+EXPORT_SYMBOL(class_unlink_export);
+
+/* Import management functions */
+static void class_import_destroy(struct obd_import *imp)
+{
+ CDEBUG(D_IOCTL, "destroying import %p for %s\n", imp,
+ imp->imp_obd->obd_name);
+
+ LASSERT_ATOMIC_ZERO(&imp->imp_refcount);
+
+ ptlrpc_put_connection_superhack(imp->imp_connection);
+
+ while (!list_empty(&imp->imp_conn_list)) {
+ struct obd_import_conn *imp_conn;
+
+ imp_conn = list_entry(imp->imp_conn_list.next,
+ struct obd_import_conn, oic_item);
+ list_del_init(&imp_conn->oic_item);
+ ptlrpc_put_connection_superhack(imp_conn->oic_conn);
+ OBD_FREE(imp_conn, sizeof(*imp_conn));
+ }
+
+ LASSERT(imp->imp_sec == NULL);
+ class_decref(imp->imp_obd, "import", imp);
+ OBD_FREE_RCU(imp, sizeof(*imp), &imp->imp_handle);
+}
+
+static void import_handle_addref(void *import)
+{
+ class_import_get(import);
+}
+
+static struct portals_handle_ops import_handle_ops = {
+ .hop_addref = import_handle_addref,
+ .hop_free = NULL,
+};
+
+struct obd_import *class_import_get(struct obd_import *import)
+{
+ atomic_inc(&import->imp_refcount);
+ CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", import,
+ atomic_read(&import->imp_refcount),
+ import->imp_obd->obd_name);
+ return import;
+}
+EXPORT_SYMBOL(class_import_get);
+
+void class_import_put(struct obd_import *imp)
+{
+ LASSERT(list_empty(&imp->imp_zombie_chain));
+ LASSERT_ATOMIC_GT_LT(&imp->imp_refcount, 0, LI_POISON);
+
+ CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", imp,
+ atomic_read(&imp->imp_refcount) - 1,
+ imp->imp_obd->obd_name);
+
+ if (atomic_dec_and_test(&imp->imp_refcount)) {
+ CDEBUG(D_INFO, "final put import %p\n", imp);
+ obd_zombie_import_add(imp);
+ }
+
+ /* catch possible import put race */
+ LASSERT_ATOMIC_GE_LT(&imp->imp_refcount, 0, LI_POISON);
+}
+EXPORT_SYMBOL(class_import_put);
+
+static void init_imp_at(struct imp_at *at) {
+ int i;
+ at_init(&at->iat_net_latency, 0, 0);
+ for (i = 0; i < IMP_AT_MAX_PORTALS; i++) {
+ /* max service estimates are tracked on the server side, so
+ don't use the AT history here, just use the last reported
+ val. (But keep hist for proc histogram, worst_ever) */
+ at_init(&at->iat_service_estimate[i], INITIAL_CONNECT_TIMEOUT,
+ AT_FLG_NOHIST);
+ }
+}
+
+struct obd_import *class_new_import(struct obd_device *obd)
+{
+ struct obd_import *imp;
+
+ OBD_ALLOC(imp, sizeof(*imp));
+ if (imp == NULL)
+ return NULL;
+
+ INIT_LIST_HEAD(&imp->imp_pinger_chain);
+ INIT_LIST_HEAD(&imp->imp_zombie_chain);
+ INIT_LIST_HEAD(&imp->imp_replay_list);
+ INIT_LIST_HEAD(&imp->imp_sending_list);
+ INIT_LIST_HEAD(&imp->imp_delayed_list);
+ INIT_LIST_HEAD(&imp->imp_committed_list);
+ imp->imp_replay_cursor = &imp->imp_committed_list;
+ spin_lock_init(&imp->imp_lock);
+ imp->imp_last_success_conn = 0;
+ imp->imp_state = LUSTRE_IMP_NEW;
+ imp->imp_obd = class_incref(obd, "import", imp);
+ mutex_init(&imp->imp_sec_mutex);
+ init_waitqueue_head(&imp->imp_recovery_waitq);
+
+ atomic_set(&imp->imp_refcount, 2);
+ atomic_set(&imp->imp_unregistering, 0);
+ atomic_set(&imp->imp_inflight, 0);
+ atomic_set(&imp->imp_replay_inflight, 0);
+ atomic_set(&imp->imp_inval_count, 0);
+ INIT_LIST_HEAD(&imp->imp_conn_list);
+ INIT_LIST_HEAD(&imp->imp_handle.h_link);
+ class_handle_hash(&imp->imp_handle, &import_handle_ops);
+ init_imp_at(&imp->imp_at);
+
+ /* the default magic is V2, will be used in connect RPC, and
+ * then adjusted according to the flags in request/reply. */
+ imp->imp_msg_magic = LUSTRE_MSG_MAGIC_V2;
+
+ return imp;
+}
+EXPORT_SYMBOL(class_new_import);
+
+void class_destroy_import(struct obd_import *import)
+{
+ LASSERT(import != NULL);
+ LASSERT(import != LP_POISON);
+
+ class_handle_unhash(&import->imp_handle);
+
+ spin_lock(&import->imp_lock);
+ import->imp_generation++;
+ spin_unlock(&import->imp_lock);
+ class_import_put(import);
+}
+EXPORT_SYMBOL(class_destroy_import);
+
+#if LUSTRE_TRACKS_LOCK_EXP_REFS
+
+void __class_export_add_lock_ref(struct obd_export *exp, struct ldlm_lock *lock)
+{
+ spin_lock(&exp->exp_locks_list_guard);
+
+ LASSERT(lock->l_exp_refs_nr >= 0);
+
+ if (lock->l_exp_refs_target != NULL &&
+ lock->l_exp_refs_target != exp) {
+ LCONSOLE_WARN("setting export %p for lock %p which already has export %p\n",
+ exp, lock, lock->l_exp_refs_target);
+ }
+ if ((lock->l_exp_refs_nr ++) == 0) {
+ list_add(&lock->l_exp_refs_link, &exp->exp_locks_list);
+ lock->l_exp_refs_target = exp;
+ }
+ CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n",
+ lock, exp, lock->l_exp_refs_nr);
+ spin_unlock(&exp->exp_locks_list_guard);
+}
+EXPORT_SYMBOL(__class_export_add_lock_ref);
+
+void __class_export_del_lock_ref(struct obd_export *exp, struct ldlm_lock *lock)
+{
+ spin_lock(&exp->exp_locks_list_guard);
+ LASSERT(lock->l_exp_refs_nr > 0);
+ if (lock->l_exp_refs_target != exp) {
+ LCONSOLE_WARN("lock %p, mismatching export pointers: %p, %p\n",
+ lock, lock->l_exp_refs_target, exp);
+ }
+ if (-- lock->l_exp_refs_nr == 0) {
+ list_del_init(&lock->l_exp_refs_link);
+ lock->l_exp_refs_target = NULL;
+ }
+ CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n",
+ lock, exp, lock->l_exp_refs_nr);
+ spin_unlock(&exp->exp_locks_list_guard);
+}
+EXPORT_SYMBOL(__class_export_del_lock_ref);
+#endif
+
+/* A connection defines an export context in which preallocation can
+ be managed. This releases the export pointer reference, and returns
+ the export handle, so the export refcount is 1 when this function
+ returns. */
+int class_connect(struct lustre_handle *conn, struct obd_device *obd,
+ struct obd_uuid *cluuid)
+{
+ struct obd_export *export;
+ LASSERT(conn != NULL);
+ LASSERT(obd != NULL);
+ LASSERT(cluuid != NULL);
+
+ export = class_new_export(obd, cluuid);
+ if (IS_ERR(export))
+ return PTR_ERR(export);
+
+ conn->cookie = export->exp_handle.h_cookie;
+ class_export_put(export);
+
+ CDEBUG(D_IOCTL, "connect: client %s, cookie %#llx\n",
+ cluuid->uuid, conn->cookie);
+ return 0;
+}
+EXPORT_SYMBOL(class_connect);
+
+/* if export is involved in recovery then clean up related things */
+static void class_export_recovery_cleanup(struct obd_export *exp)
+{
+ struct obd_device *obd = exp->exp_obd;
+
+ spin_lock(&obd->obd_recovery_task_lock);
+ if (exp->exp_delayed)
+ obd->obd_delayed_clients--;
+ if (obd->obd_recovering) {
+ if (exp->exp_in_recovery) {
+ spin_lock(&exp->exp_lock);
+ exp->exp_in_recovery = 0;
+ spin_unlock(&exp->exp_lock);
+ LASSERT_ATOMIC_POS(&obd->obd_connected_clients);
+ atomic_dec(&obd->obd_connected_clients);
+ }
+
+ /* if called during recovery then should update
+ * obd_stale_clients counter,
+ * lightweight exports are not counted */
+ if (exp->exp_failed &&
+ (exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT) == 0)
+ exp->exp_obd->obd_stale_clients++;
+ }
+ spin_unlock(&obd->obd_recovery_task_lock);
+
+ spin_lock(&exp->exp_lock);
+ /** Cleanup req replay fields */
+ if (exp->exp_req_replay_needed) {
+ exp->exp_req_replay_needed = 0;
+
+ LASSERT(atomic_read(&obd->obd_req_replay_clients));
+ atomic_dec(&obd->obd_req_replay_clients);
+ }
+
+ /** Cleanup lock replay data */
+ if (exp->exp_lock_replay_needed) {
+ exp->exp_lock_replay_needed = 0;
+
+ LASSERT(atomic_read(&obd->obd_lock_replay_clients));
+ atomic_dec(&obd->obd_lock_replay_clients);
+ }
+ spin_unlock(&exp->exp_lock);
+}
+
+/* This function removes 1-3 references from the export:
+ * 1 - for export pointer passed
+ * and if disconnect really need
+ * 2 - removing from hash
+ * 3 - in client_unlink_export
+ * The export pointer passed to this function can destroyed */
+int class_disconnect(struct obd_export *export)
+{
+ int already_disconnected;
+
+ if (export == NULL) {
+ CWARN("attempting to free NULL export %p\n", export);
+ return -EINVAL;
+ }
+
+ spin_lock(&export->exp_lock);
+ already_disconnected = export->exp_disconnected;
+ export->exp_disconnected = 1;
+ spin_unlock(&export->exp_lock);
+
+ /* class_cleanup(), abort_recovery(), and class_fail_export()
+ * all end up in here, and if any of them race we shouldn't
+ * call extra class_export_puts(). */
+ if (already_disconnected) {
+ LASSERT(hlist_unhashed(&export->exp_nid_hash));
+ goto no_disconn;
+ }
+
+ CDEBUG(D_IOCTL, "disconnect: cookie %#llx\n",
+ export->exp_handle.h_cookie);
+
+ if (!hlist_unhashed(&export->exp_nid_hash))
+ cfs_hash_del(export->exp_obd->obd_nid_hash,
+ &export->exp_connection->c_peer.nid,
+ &export->exp_nid_hash);
+
+ class_export_recovery_cleanup(export);
+ class_unlink_export(export);
+no_disconn:
+ class_export_put(export);
+ return 0;
+}
+EXPORT_SYMBOL(class_disconnect);
+
+/* Return non-zero for a fully connected export */
+int class_connected_export(struct obd_export *exp)
+{
+ if (exp) {
+ int connected;
+ spin_lock(&exp->exp_lock);
+ connected = exp->exp_conn_cnt > 0;
+ spin_unlock(&exp->exp_lock);
+ return connected;
+ }
+ return 0;
+}
+EXPORT_SYMBOL(class_connected_export);
+
+static void class_disconnect_export_list(struct list_head *list,
+ enum obd_option flags)
+{
+ int rc;
+ struct obd_export *exp;
+
+ /* It's possible that an export may disconnect itself, but
+ * nothing else will be added to this list. */
+ while (!list_empty(list)) {
+ exp = list_entry(list->next, struct obd_export,
+ exp_obd_chain);
+ /* need for safe call CDEBUG after obd_disconnect */
+ class_export_get(exp);
+
+ spin_lock(&exp->exp_lock);
+ exp->exp_flags = flags;
+ spin_unlock(&exp->exp_lock);
+
+ if (obd_uuid_equals(&exp->exp_client_uuid,
+ &exp->exp_obd->obd_uuid)) {
+ CDEBUG(D_HA,
+ "exp %p export uuid == obd uuid, don't discon\n",
+ exp);
+ /* Need to delete this now so we don't end up pointing
+ * to work_list later when this export is cleaned up. */
+ list_del_init(&exp->exp_obd_chain);
+ class_export_put(exp);
+ continue;
+ }
+
+ class_export_get(exp);
+ CDEBUG(D_HA, "%s: disconnecting export at %s (%p), last request at " CFS_TIME_T "\n",
+ exp->exp_obd->obd_name, obd_export_nid2str(exp),
+ exp, exp->exp_last_request_time);
+ /* release one export reference anyway */
+ rc = obd_disconnect(exp);
+
+ CDEBUG(D_HA, "disconnected export at %s (%p): rc %d\n",
+ obd_export_nid2str(exp), exp, rc);
+ class_export_put(exp);
+ }
+}
+
+void class_disconnect_exports(struct obd_device *obd)
+{
+ struct list_head work_list;
+
+ /* Move all of the exports from obd_exports to a work list, en masse. */
+ INIT_LIST_HEAD(&work_list);
+ spin_lock(&obd->obd_dev_lock);
+ list_splice_init(&obd->obd_exports, &work_list);
+ list_splice_init(&obd->obd_delayed_exports, &work_list);
+ spin_unlock(&obd->obd_dev_lock);
+
+ if (!list_empty(&work_list)) {
+ CDEBUG(D_HA, "OBD device %d (%p) has exports, disconnecting them\n",
+ obd->obd_minor, obd);
+ class_disconnect_export_list(&work_list,
+ exp_flags_from_obd(obd));
+ } else
+ CDEBUG(D_HA, "OBD device %d (%p) has no exports\n",
+ obd->obd_minor, obd);
+}
+EXPORT_SYMBOL(class_disconnect_exports);
+
+/* Remove exports that have not completed recovery.
+ */
+void class_disconnect_stale_exports(struct obd_device *obd,
+ int (*test_export)(struct obd_export *))
+{
+ struct list_head work_list;
+ struct obd_export *exp, *n;
+ int evicted = 0;
+
+ INIT_LIST_HEAD(&work_list);
+ spin_lock(&obd->obd_dev_lock);
+ list_for_each_entry_safe(exp, n, &obd->obd_exports,
+ exp_obd_chain) {
+ /* don't count self-export as client */
+ if (obd_uuid_equals(&exp->exp_client_uuid,
+ &exp->exp_obd->obd_uuid))
+ continue;
+
+ /* don't evict clients which have no slot in last_rcvd
+ * (e.g. lightweight connection) */
+ if (exp->exp_target_data.ted_lr_idx == -1)
+ continue;
+
+ spin_lock(&exp->exp_lock);
+ if (exp->exp_failed || test_export(exp)) {
+ spin_unlock(&exp->exp_lock);
+ continue;
+ }
+ exp->exp_failed = 1;
+ spin_unlock(&exp->exp_lock);
+
+ list_move(&exp->exp_obd_chain, &work_list);
+ evicted++;
+ CDEBUG(D_HA, "%s: disconnect stale client %s@%s\n",
+ obd->obd_name, exp->exp_client_uuid.uuid,
+ exp->exp_connection == NULL ? "<unknown>" :
+ libcfs_nid2str(exp->exp_connection->c_peer.nid));
+ print_export_data(exp, "EVICTING", 0);
+ }
+ spin_unlock(&obd->obd_dev_lock);
+
+ if (evicted)
+ LCONSOLE_WARN("%s: disconnecting %d stale clients\n",
+ obd->obd_name, evicted);
+
+ class_disconnect_export_list(&work_list, exp_flags_from_obd(obd) |
+ OBD_OPT_ABORT_RECOV);
+}
+EXPORT_SYMBOL(class_disconnect_stale_exports);
+
+void class_fail_export(struct obd_export *exp)
+{
+ int rc, already_failed;
+
+ spin_lock(&exp->exp_lock);
+ already_failed = exp->exp_failed;
+ exp->exp_failed = 1;
+ spin_unlock(&exp->exp_lock);
+
+ if (already_failed) {
+ CDEBUG(D_HA, "disconnecting dead export %p/%s; skipping\n",
+ exp, exp->exp_client_uuid.uuid);
+ return;
+ }
+
+ CDEBUG(D_HA, "disconnecting export %p/%s\n",
+ exp, exp->exp_client_uuid.uuid);
+
+ if (obd_dump_on_timeout)
+ libcfs_debug_dumplog();
+
+ /* need for safe call CDEBUG after obd_disconnect */
+ class_export_get(exp);
+
+ /* Most callers into obd_disconnect are removing their own reference
+ * (request, for example) in addition to the one from the hash table.
+ * We don't have such a reference here, so make one. */
+ class_export_get(exp);
+ rc = obd_disconnect(exp);
+ if (rc)
+ CERROR("disconnecting export %p failed: %d\n", exp, rc);
+ else
+ CDEBUG(D_HA, "disconnected export %p/%s\n",
+ exp, exp->exp_client_uuid.uuid);
+ class_export_put(exp);
+}
+EXPORT_SYMBOL(class_fail_export);
+
+char *obd_export_nid2str(struct obd_export *exp)
+{
+ if (exp->exp_connection != NULL)
+ return libcfs_nid2str(exp->exp_connection->c_peer.nid);
+
+ return "(no nid)";
+}
+EXPORT_SYMBOL(obd_export_nid2str);
+
+int obd_export_evict_by_nid(struct obd_device *obd, const char *nid)
+{
+ struct cfs_hash *nid_hash;
+ struct obd_export *doomed_exp = NULL;
+ int exports_evicted = 0;
+
+ lnet_nid_t nid_key = libcfs_str2nid((char *)nid);
+
+ spin_lock(&obd->obd_dev_lock);
+ /* umount has run already, so evict thread should leave
+ * its task to umount thread now */
+ if (obd->obd_stopping) {
+ spin_unlock(&obd->obd_dev_lock);
+ return exports_evicted;
+ }
+ nid_hash = obd->obd_nid_hash;
+ cfs_hash_getref(nid_hash);
+ spin_unlock(&obd->obd_dev_lock);
+
+ do {
+ doomed_exp = cfs_hash_lookup(nid_hash, &nid_key);
+ if (doomed_exp == NULL)
+ break;
+
+ LASSERTF(doomed_exp->exp_connection->c_peer.nid == nid_key,
+ "nid %s found, wanted nid %s, requested nid %s\n",
+ obd_export_nid2str(doomed_exp),
+ libcfs_nid2str(nid_key), nid);
+ LASSERTF(doomed_exp != obd->obd_self_export,
+ "self-export is hashed by NID?\n");
+ exports_evicted++;
+ LCONSOLE_WARN("%s: evicting %s (at %s) by administrative request\n",
+ obd->obd_name,
+ obd_uuid2str(&doomed_exp->exp_client_uuid),
+ obd_export_nid2str(doomed_exp));
+ class_fail_export(doomed_exp);
+ class_export_put(doomed_exp);
+ } while (1);
+
+ cfs_hash_putref(nid_hash);
+
+ if (!exports_evicted)
+ CDEBUG(D_HA,
+ "%s: can't disconnect NID '%s': no exports found\n",
+ obd->obd_name, nid);
+ return exports_evicted;
+}
+EXPORT_SYMBOL(obd_export_evict_by_nid);
+
+int obd_export_evict_by_uuid(struct obd_device *obd, const char *uuid)
+{
+ struct cfs_hash *uuid_hash;
+ struct obd_export *doomed_exp = NULL;
+ struct obd_uuid doomed_uuid;
+ int exports_evicted = 0;
+
+ spin_lock(&obd->obd_dev_lock);
+ if (obd->obd_stopping) {
+ spin_unlock(&obd->obd_dev_lock);
+ return exports_evicted;
+ }
+ uuid_hash = obd->obd_uuid_hash;
+ cfs_hash_getref(uuid_hash);
+ spin_unlock(&obd->obd_dev_lock);
+
+ obd_str2uuid(&doomed_uuid, uuid);
+ if (obd_uuid_equals(&doomed_uuid, &obd->obd_uuid)) {
+ CERROR("%s: can't evict myself\n", obd->obd_name);
+ cfs_hash_putref(uuid_hash);
+ return exports_evicted;
+ }
+
+ doomed_exp = cfs_hash_lookup(uuid_hash, &doomed_uuid);
+
+ if (doomed_exp == NULL) {
+ CERROR("%s: can't disconnect %s: no exports found\n",
+ obd->obd_name, uuid);
+ } else {
+ CWARN("%s: evicting %s at administrative request\n",
+ obd->obd_name, doomed_exp->exp_client_uuid.uuid);
+ class_fail_export(doomed_exp);
+ class_export_put(doomed_exp);
+ exports_evicted++;
+ }
+ cfs_hash_putref(uuid_hash);
+
+ return exports_evicted;
+}
+EXPORT_SYMBOL(obd_export_evict_by_uuid);
+
+#if LUSTRE_TRACKS_LOCK_EXP_REFS
+void (*class_export_dump_hook)(struct obd_export*) = NULL;
+EXPORT_SYMBOL(class_export_dump_hook);
+#endif
+
+static void print_export_data(struct obd_export *exp, const char *status,
+ int locks)
+{
+ struct ptlrpc_reply_state *rs;
+ struct ptlrpc_reply_state *first_reply = NULL;
+ int nreplies = 0;
+
+ spin_lock(&exp->exp_lock);
+ list_for_each_entry(rs, &exp->exp_outstanding_replies,
+ rs_exp_list) {
+ if (nreplies == 0)
+ first_reply = rs;
+ nreplies++;
+ }
+ spin_unlock(&exp->exp_lock);
+
+ CDEBUG(D_HA, "%s: %s %p %s %s %d (%d %d %d) %d %d %d %d: %p %s %llu\n",
+ exp->exp_obd->obd_name, status, exp, exp->exp_client_uuid.uuid,
+ obd_export_nid2str(exp), atomic_read(&exp->exp_refcount),
+ atomic_read(&exp->exp_rpc_count),
+ atomic_read(&exp->exp_cb_count),
+ atomic_read(&exp->exp_locks_count),
+ exp->exp_disconnected, exp->exp_delayed, exp->exp_failed,
+ nreplies, first_reply, nreplies > 3 ? "..." : "",
+ exp->exp_last_committed);
+#if LUSTRE_TRACKS_LOCK_EXP_REFS
+ if (locks && class_export_dump_hook != NULL)
+ class_export_dump_hook(exp);
+#endif
+}
+
+void dump_exports(struct obd_device *obd, int locks)
+{
+ struct obd_export *exp;
+
+ spin_lock(&obd->obd_dev_lock);
+ list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain)
+ print_export_data(exp, "ACTIVE", locks);
+ list_for_each_entry(exp, &obd->obd_unlinked_exports, exp_obd_chain)
+ print_export_data(exp, "UNLINKED", locks);
+ list_for_each_entry(exp, &obd->obd_delayed_exports, exp_obd_chain)
+ print_export_data(exp, "DELAYED", locks);
+ spin_unlock(&obd->obd_dev_lock);
+ spin_lock(&obd_zombie_impexp_lock);
+ list_for_each_entry(exp, &obd_zombie_exports, exp_obd_chain)
+ print_export_data(exp, "ZOMBIE", locks);
+ spin_unlock(&obd_zombie_impexp_lock);
+}
+EXPORT_SYMBOL(dump_exports);
+
+void obd_exports_barrier(struct obd_device *obd)
+{
+ int waited = 2;
+ LASSERT(list_empty(&obd->obd_exports));
+ spin_lock(&obd->obd_dev_lock);
+ while (!list_empty(&obd->obd_unlinked_exports)) {
+ spin_unlock(&obd->obd_dev_lock);
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(cfs_time_seconds(waited));
+ if (waited > 5 && IS_PO2(waited)) {
+ LCONSOLE_WARN("%s is waiting for obd_unlinked_exports more than %d seconds. The obd refcount = %d. Is it stuck?\n",
+ obd->obd_name, waited,
+ atomic_read(&obd->obd_refcount));
+ dump_exports(obd, 1);
+ }
+ waited *= 2;
+ spin_lock(&obd->obd_dev_lock);
+ }
+ spin_unlock(&obd->obd_dev_lock);
+}
+EXPORT_SYMBOL(obd_exports_barrier);
+
+/* Total amount of zombies to be destroyed */
+static int zombies_count;
+
+/**
+ * kill zombie imports and exports
+ */
+void obd_zombie_impexp_cull(void)
+{
+ struct obd_import *import;
+ struct obd_export *export;
+
+ do {
+ spin_lock(&obd_zombie_impexp_lock);
+
+ import = NULL;
+ if (!list_empty(&obd_zombie_imports)) {
+ import = list_entry(obd_zombie_imports.next,
+ struct obd_import,
+ imp_zombie_chain);
+ list_del_init(&import->imp_zombie_chain);
+ }
+
+ export = NULL;
+ if (!list_empty(&obd_zombie_exports)) {
+ export = list_entry(obd_zombie_exports.next,
+ struct obd_export,
+ exp_obd_chain);
+ list_del_init(&export->exp_obd_chain);
+ }
+
+ spin_unlock(&obd_zombie_impexp_lock);
+
+ if (import != NULL) {
+ class_import_destroy(import);
+ spin_lock(&obd_zombie_impexp_lock);
+ zombies_count--;
+ spin_unlock(&obd_zombie_impexp_lock);
+ }
+
+ if (export != NULL) {
+ class_export_destroy(export);
+ spin_lock(&obd_zombie_impexp_lock);
+ zombies_count--;
+ spin_unlock(&obd_zombie_impexp_lock);
+ }
+
+ cond_resched();
+ } while (import != NULL || export != NULL);
+}
+
+static struct completion obd_zombie_start;
+static struct completion obd_zombie_stop;
+static unsigned long obd_zombie_flags;
+static wait_queue_head_t obd_zombie_waitq;
+static pid_t obd_zombie_pid;
+
+enum {
+ OBD_ZOMBIE_STOP = 0x0001,
+};
+
+/**
+ * check for work for kill zombie import/export thread.
+ */
+static int obd_zombie_impexp_check(void *arg)
+{
+ int rc;
+
+ spin_lock(&obd_zombie_impexp_lock);
+ rc = (zombies_count == 0) &&
+ !test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags);
+ spin_unlock(&obd_zombie_impexp_lock);
+
+ return rc;
+}
+
+/**
+ * Add export to the obd_zombie thread and notify it.
+ */
+static void obd_zombie_export_add(struct obd_export *exp) {
+ spin_lock(&exp->exp_obd->obd_dev_lock);
+ LASSERT(!list_empty(&exp->exp_obd_chain));
+ list_del_init(&exp->exp_obd_chain);
+ spin_unlock(&exp->exp_obd->obd_dev_lock);
+ spin_lock(&obd_zombie_impexp_lock);
+ zombies_count++;
+ list_add(&exp->exp_obd_chain, &obd_zombie_exports);
+ spin_unlock(&obd_zombie_impexp_lock);
+
+ obd_zombie_impexp_notify();
+}
+
+/**
+ * Add import to the obd_zombie thread and notify it.
+ */
+static void obd_zombie_import_add(struct obd_import *imp) {
+ LASSERT(imp->imp_sec == NULL);
+ LASSERT(imp->imp_rq_pool == NULL);
+ spin_lock(&obd_zombie_impexp_lock);
+ LASSERT(list_empty(&imp->imp_zombie_chain));
+ zombies_count++;
+ list_add(&imp->imp_zombie_chain, &obd_zombie_imports);
+ spin_unlock(&obd_zombie_impexp_lock);
+
+ obd_zombie_impexp_notify();
+}
+
+/**
+ * notify import/export destroy thread about new zombie.
+ */
+static void obd_zombie_impexp_notify(void)
+{
+ /*
+ * Make sure obd_zombie_impexp_thread get this notification.
+ * It is possible this signal only get by obd_zombie_barrier, and
+ * barrier gulps this notification and sleeps away and hangs ensues
+ */
+ wake_up_all(&obd_zombie_waitq);
+}
+
+/**
+ * check whether obd_zombie is idle
+ */
+static int obd_zombie_is_idle(void)
+{
+ int rc;
+
+ LASSERT(!test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags));
+ spin_lock(&obd_zombie_impexp_lock);
+ rc = (zombies_count == 0);
+ spin_unlock(&obd_zombie_impexp_lock);
+ return rc;
+}
+
+/**
+ * wait when obd_zombie import/export queues become empty
+ */
+void obd_zombie_barrier(void)
+{
+ struct l_wait_info lwi = { 0 };
+
+ if (obd_zombie_pid == current_pid())
+ /* don't wait for myself */
+ return;
+ l_wait_event(obd_zombie_waitq, obd_zombie_is_idle(), &lwi);
+}
+EXPORT_SYMBOL(obd_zombie_barrier);
+
+
+/**
+ * destroy zombie export/import thread.
+ */
+static int obd_zombie_impexp_thread(void *unused)
+{
+ unshare_fs_struct();
+ complete(&obd_zombie_start);
+
+ obd_zombie_pid = current_pid();
+
+ while (!test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags)) {
+ struct l_wait_info lwi = { 0 };
+
+ l_wait_event(obd_zombie_waitq,
+ !obd_zombie_impexp_check(NULL), &lwi);
+ obd_zombie_impexp_cull();
+
+ /*
+ * Notify obd_zombie_barrier callers that queues
+ * may be empty.
+ */
+ wake_up(&obd_zombie_waitq);
+ }
+
+ complete(&obd_zombie_stop);
+
+ return 0;
+}
+
+
+/**
+ * start destroy zombie import/export thread
+ */
+int obd_zombie_impexp_init(void)
+{
+ struct task_struct *task;
+
+ INIT_LIST_HEAD(&obd_zombie_imports);
+ INIT_LIST_HEAD(&obd_zombie_exports);
+ spin_lock_init(&obd_zombie_impexp_lock);
+ init_completion(&obd_zombie_start);
+ init_completion(&obd_zombie_stop);
+ init_waitqueue_head(&obd_zombie_waitq);
+ obd_zombie_pid = 0;
+
+ task = kthread_run(obd_zombie_impexp_thread, NULL, "obd_zombid");
+ if (IS_ERR(task))
+ return PTR_ERR(task);
+
+ wait_for_completion(&obd_zombie_start);
+ return 0;
+}
+/**
+ * stop destroy zombie import/export thread
+ */
+void obd_zombie_impexp_stop(void)
+{
+ set_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags);
+ obd_zombie_impexp_notify();
+ wait_for_completion(&obd_zombie_stop);
+}
+
+/***** Kernel-userspace comm helpers *******/
+
+/* Get length of entire message, including header */
+int kuc_len(int payload_len)
+{
+ return sizeof(struct kuc_hdr) + payload_len;
+}
+EXPORT_SYMBOL(kuc_len);
+
+/* Get a pointer to kuc header, given a ptr to the payload
+ * @param p Pointer to payload area
+ * @returns Pointer to kuc header
+ */
+struct kuc_hdr *kuc_ptr(void *p)
+{
+ struct kuc_hdr *lh = ((struct kuc_hdr *)p) - 1;
+ LASSERT(lh->kuc_magic == KUC_MAGIC);
+ return lh;
+}
+EXPORT_SYMBOL(kuc_ptr);
+
+/* Test if payload is part of kuc message
+ * @param p Pointer to payload area
+ * @returns boolean
+ */
+int kuc_ispayload(void *p)
+{
+ struct kuc_hdr *kh = ((struct kuc_hdr *)p) - 1;
+
+ if (kh->kuc_magic == KUC_MAGIC)
+ return 1;
+ else
+ return 0;
+}
+EXPORT_SYMBOL(kuc_ispayload);
+
+/* Alloc space for a message, and fill in header
+ * @return Pointer to payload area
+ */
+void *kuc_alloc(int payload_len, int transport, int type)
+{
+ struct kuc_hdr *lh;
+ int len = kuc_len(payload_len);
+
+ OBD_ALLOC(lh, len);
+ if (lh == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ lh->kuc_magic = KUC_MAGIC;
+ lh->kuc_transport = transport;
+ lh->kuc_msgtype = type;
+ lh->kuc_msglen = len;
+
+ return (void *)(lh + 1);
+}
+EXPORT_SYMBOL(kuc_alloc);
+
+/* Takes pointer to payload area */
+inline void kuc_free(void *p, int payload_len)
+{
+ struct kuc_hdr *lh = kuc_ptr(p);
+ OBD_FREE(lh, kuc_len(payload_len));
+}
+EXPORT_SYMBOL(kuc_free);
Code Review / kvmfornfv.git / blobdiff