/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=8:tabstop=8:
*
- * Copyright (c) 2001-2003 Cluster File Systems, Inc.
+ * GPL HEADER START
*
- * This file is part of the Lustre file system, http://www.lustre.org
- * Lustre is a trademark of Cluster File Systems, Inc.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
- * You may have signed or agreed to another license before downloading
- * this software. If so, you are bound by the terms and conditions
- * of that agreement, and the following does not apply to you. See the
- * LICENSE file included with this distribution for more information.
+ * 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.
*
- * If you did not agree to a different license, then this copy of Lustre
- * is open source software; you can redistribute it and/or modify it
- * under the terms of version 2 of the GNU General Public License 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).
*
- * In either case, Lustre 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
- * license text for more details.
+ * 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 2008 Sun Microsystems, Inc. All rights reserved
+ * Use is subject to license terms.
+ */
+/*
+ * 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
#include <obd_ost.h>
#include <obd_class.h>
#include <lprocfs_status.h>
+#include <class_hash.h>
extern struct list_head obd_types;
spinlock_t obd_types_lock;
struct list_head obd_zombie_imports;
struct list_head obd_zombie_exports;
spinlock_t obd_zombie_impexp_lock;
-void (*obd_zombie_impexp_notify)(void) = NULL;
-EXPORT_SYMBOL(obd_zombie_impexp_notify);
-
+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);
int (*ptlrpc_put_connection_superhack)(struct ptlrpc_connection *c);
{
struct obd_device *obd;
- OBD_SLAB_ALLOC(obd, obd_device_cachep, SLAB_KERNEL, sizeof(*obd));
+ OBD_SLAB_ALLOC_PTR_GFP(obd, obd_device_cachep, CFS_ALLOC_IO);
if (obd != NULL) {
obd->obd_magic = OBD_DEVICE_MAGIC;
}
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",
+ LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "obd %p obd_magic %08x != %08x\n",
obd, obd->obd_magic, OBD_DEVICE_MAGIC);
- OBD_SLAB_FREE(obd, obd_device_cachep, sizeof(*obd));
+ 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);
}
-EXPORT_SYMBOL(obd_device_free);
struct obd_type *class_search_type(const char *name)
{
#ifdef CONFIG_KMOD
if (!type) {
const char *modname = name;
- if (strcmp(modname, LUSTRE_MDT_NAME) == 0)
- modname = LUSTRE_MDS_NAME;
if (!request_module(modname)) {
CDEBUG(D_INFO, "Loaded module '%s'\n", modname);
type = class_search_type(name);
} else {
- LCONSOLE_ERROR("Can't load module '%s'\n", modname);
+ LCONSOLE_ERROR_MSG(0x158, "Can't load module '%s'\n",
+ modname);
}
}
#endif
if (type) {
spin_lock(&type->obd_type_lock);
type->typ_refcnt++;
- try_module_get(type->typ_ops->o_owner);
+ try_module_get(type->typ_dt_ops->o_owner);
spin_unlock(&type->obd_type_lock);
}
return type;
LASSERT(type);
spin_lock(&type->obd_type_lock);
type->typ_refcnt--;
- module_put(type->typ_ops->o_owner);
+ module_put(type->typ_dt_ops->o_owner);
spin_unlock(&type->obd_type_lock);
}
-int class_register_type(struct obd_ops *ops, struct lprocfs_vars *vars,
- const char *name)
+#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;
ENTRY;
- LASSERT(strnlen(name, 1024) < 1024); /* sanity check */
+ /* 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);
if (type == NULL)
RETURN(rc);
- OBD_ALLOC(type->typ_ops, sizeof(*type->typ_ops));
+ 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_ops == NULL || type->typ_name == NULL)
+
+ if (type->typ_dt_ops == NULL ||
+ type->typ_md_ops == NULL ||
+ type->typ_name == NULL)
GOTO (failed, rc);
- *(type->typ_ops) = *ops;
+ *(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);
GOTO (failed, rc);
}
#endif
+ if (ldt != NULL) {
+ type->typ_lu = ldt;
+ rc = lu_device_type_init(ldt);
+ if (rc != 0)
+ GOTO (failed, rc);
+ }
spin_lock(&obd_types_lock);
list_add(&type->typ_chain, &obd_types);
failed:
if (type->typ_name != NULL)
OBD_FREE(type->typ_name, strlen(name) + 1);
- if (type->typ_ops != NULL)
- OBD_FREE (type->typ_ops, sizeof (*type->typ_ops));
+ 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);
}
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(type->typ_ops, sizeof(*type->typ_ops));
+ OBD_FREE_PTR(type->typ_dt_ops);
+ OBD_FREE_PTR(type->typ_md_ops);
RETURN(-EBUSY);
}
- if (type->typ_procroot)
+ 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_ops != NULL)
- OBD_FREE(type->typ_ops, sizeof(*type->typ_ops));
+ 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 */
+/**
+ * Create a new obd device.
+ *
+ * Find an empty slot in ::obd_devs[], create a new obd device in it.
+ *
+ * \param typename [in] obd device type string.
+ * \param name [in] 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;
int i;
int new_obd_minor = 0;
- if (strlen(name) > MAX_OBD_NAME) {
+ if (strlen(name) >= MAX_OBD_NAME) {
CERROR("name/uuid must be < %u bytes long\n", MAX_OBD_NAME);
RETURN(ERR_PTR(-EINVAL));
}
}
newdev = obd_device_alloc();
- if (newdev == NULL) {
+ if (newdev == NULL) {
class_put_type(type);
RETURN(ERR_PTR(-ENOMEM));
}
spin_lock(&obd_dev_lock);
for (i = 0; i < class_devno_max(); i++) {
struct obd_device *obd = class_num2obd(i);
- if (obd && obd->obd_name && (strcmp(name, obd->obd_name) == 0)){
+ if (obd && obd->obd_name &&
+ (strcmp(name, obd->obd_name) == 0)) {
CERROR("Device %s already exists, won't add\n", name);
if (result) {
LASSERTF(result->obd_magic == OBD_DEVICE_MAGIC,
obd_devs[result->obd_minor] = NULL;
result->obd_name[0]='\0';
- }
+ }
result = ERR_PTR(-EEXIST);
break;
}
result->obd_minor = i;
new_obd_minor = i;
result->obd_type = type;
- memcpy(result->obd_name, name, strlen(name));
+ strncpy(result->obd_name, name,
+ sizeof(result->obd_name) - 1);
obd_devs[i] = result;
}
}
spin_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);
}
-
+
if (IS_ERR(result)) {
obd_device_free(newdev);
class_put_type(type);
return class_num2obd(dev);
}
+/**
+ * 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) {
+ if (obd == NULL)
return NULL;
- }
LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
"%p obd_magic %08x != %08x\n",
return NULL;
}
-struct obd_device *class_find_client_notype(struct obd_uuid *tgt_uuid,
- struct obd_uuid *grp_uuid)
-{
- struct obd_device *obd;
-
- obd = class_find_client_obd(tgt_uuid, LUSTRE_MDC_NAME, NULL);
- if (!obd)
- obd = class_find_client_obd(tgt_uuid, LUSTRE_OSC_NAME,
- grp_uuid);
- return 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
return NULL;
}
+/**
+ * to notify sptlrpc log for @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);
+
+ spin_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, __FUNCTION__, obd);
+ spin_unlock(&obd_dev_lock);
+ rc2 = obd_set_info_async(obd->obd_self_export,
+ sizeof(KEY_SPTLRPC_CONF),
+ KEY_SPTLRPC_CONF, 0, NULL, NULL);
+ rc = rc ? rc : rc2;
+ class_decref(obd, __FUNCTION__, obd);
+ spin_lock(&obd_dev_lock);
+ }
+ spin_unlock(&obd_dev_lock);
+ return rc;
+}
+EXPORT_SYMBOL(class_notify_sptlrpc_conf);
void obd_cleanup_caches(void)
{
LASSERTF(rc == 0, "Cannot destory ll_import_cache\n");
import_cachep = NULL;
}
+ if (capa_cachep) {
+ rc = cfs_mem_cache_destroy(capa_cachep);
+ LASSERTF(rc == 0, "Cannot destory capa_cache\n");
+ capa_cachep = NULL;
+ }
EXIT;
}
LASSERT(obd_device_cachep == NULL);
obd_device_cachep = cfs_mem_cache_create("ll_obd_dev_cache",
- sizeof(struct obd_device), 0, 0);
+ sizeof(struct obd_device),
+ 0, 0);
if (!obd_device_cachep)
GOTO(out, -ENOMEM);
LASSERT(obdo_cachep == NULL);
obdo_cachep = cfs_mem_cache_create("ll_obdo_cache", sizeof(struct obdo),
- 0, 0);
+ 0, 0);
if (!obdo_cachep)
GOTO(out, -ENOMEM);
LASSERT(import_cachep == NULL);
import_cachep = cfs_mem_cache_create("ll_import_cache",
- sizeof(struct obd_import),
- 0, 0);
+ sizeof(struct obd_import),
+ 0, 0);
if (!import_cachep)
GOTO(out, -ENOMEM);
+ LASSERT(capa_cachep == NULL);
+ capa_cachep = cfs_mem_cache_create("capa_cache",
+ sizeof(struct obd_capa), 0, 0);
+ if (!capa_cachep)
+ GOTO(out, -ENOMEM);
+
RETURN(0);
out:
obd_cleanup_caches();
}
/* Export management functions */
-static void export_handle_addref(void *export)
-{
- class_export_get(export);
-}
-
-void __class_export_put(struct obd_export *exp)
-{
- 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);
-
- spin_lock(&obd_zombie_impexp_lock);
- list_add(&exp->exp_obd_chain, &obd_zombie_exports);
- spin_unlock(&obd_zombie_impexp_lock);
-
- if (obd_zombie_impexp_notify != NULL)
- obd_zombie_impexp_notify();
- }
-}
-EXPORT_SYMBOL(__class_export_put);
-
-void class_export_destroy(struct obd_export *exp)
+static void class_export_destroy(struct obd_export *exp)
{
struct obd_device *obd = exp->exp_obd;
+ ENTRY;
LASSERT (atomic_read(&exp->exp_refcount) == 0);
- CDEBUG(D_IOCTL, "destroying export %p/%s\n", exp,
- exp->exp_client_uuid.uuid);
+ CDEBUG(D_IOCTL, "destroying export %p/%s for %s\n", exp,
+ exp->exp_client_uuid.uuid, obd->obd_name);
LASSERT(obd != NULL);
ptlrpc_put_connection_superhack(exp->exp_connection);
LASSERT(list_empty(&exp->exp_outstanding_replies));
- LASSERT(list_empty(&exp->exp_handle.h_link));
+ LASSERT(list_empty(&exp->exp_uncommitted_replies));
+ LASSERT(list_empty(&exp->exp_req_replay_queue));
+ LASSERT(list_empty(&exp->exp_queued_rpc));
obd_destroy_export(exp);
+ class_decref(obd, "export", exp);
+
+ OBD_FREE_RCU(exp, sizeof(*exp), &exp->exp_handle);
+ EXIT;
+}
+
+static void export_handle_addref(void *export)
+{
+ class_export_get(export);
+}
+
+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);
- OBD_FREE(exp, sizeof(*exp));
- class_decref(obd);
+void class_export_put(struct obd_export *exp)
+{
+ LASSERT(exp != NULL);
+ CDEBUG(D_INFO, "PUTting export %p : new refcount %d\n", exp,
+ atomic_read(&exp->exp_refcount) - 1);
+ LASSERT(atomic_read(&exp->exp_refcount) > 0);
+ LASSERT(atomic_read(&exp->exp_refcount) < 0x5a5a5a);
+
+ if (atomic_dec_and_test(&exp->exp_refcount)) {
+ CDEBUG(D_IOCTL, "final put %p/%s\n",
+ exp, exp->exp_client_uuid.uuid);
+ 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
struct obd_export *class_new_export(struct obd_device *obd,
struct obd_uuid *cluuid)
{
- struct obd_export *export, *tmp;
+ struct obd_export *export;
+ int rc = 0;
- OBD_ALLOC(export, sizeof(*export));
+ OBD_ALLOC_PTR(export);
if (!export)
return ERR_PTR(-ENOMEM);
export->exp_conn_cnt = 0;
+ export->exp_lock_hash = NULL;
atomic_set(&export->exp_refcount, 2);
atomic_set(&export->exp_rpc_count, 0);
export->exp_obd = obd;
CFS_INIT_LIST_HEAD(&export->exp_outstanding_replies);
- /* XXX this should be in LDLM init */
- CFS_INIT_LIST_HEAD(&export->exp_ldlm_data.led_held_locks);
- spin_lock_init(&export->exp_ldlm_data.led_lock);
-
+ spin_lock_init(&export->exp_uncommitted_replies_lock);
+ CFS_INIT_LIST_HEAD(&export->exp_uncommitted_replies);
+ CFS_INIT_LIST_HEAD(&export->exp_req_replay_queue);
CFS_INIT_LIST_HEAD(&export->exp_handle.h_link);
+ CFS_INIT_LIST_HEAD(&export->exp_queued_rpc);
class_handle_hash(&export->exp_handle, export_handle_addref);
- export->exp_last_request_time = CURRENT_SECONDS;
+ export->exp_last_request_time = cfs_time_current_sec();
spin_lock_init(&export->exp_lock);
+ INIT_HLIST_NODE(&export->exp_uuid_hash);
+ INIT_HLIST_NODE(&export->exp_nid_hash);
+ 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);
if (!obd_uuid_equals(cluuid, &obd->obd_uuid)) {
- list_for_each_entry(tmp, &obd->obd_exports, exp_obd_chain) {
- if (obd_uuid_equals(cluuid, &tmp->exp_client_uuid)) {
- spin_unlock(&obd->obd_dev_lock);
- CWARN("%s: denying duplicate export for %s\n",
- obd->obd_name, cluuid->uuid);
- class_handle_unhash(&export->exp_handle);
- OBD_FREE_PTR(export);
- return ERR_PTR(-EALREADY);
- }
+ rc = lustre_hash_add_unique(obd->obd_uuid_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);
+ spin_unlock(&obd->obd_dev_lock);
+ class_handle_unhash(&export->exp_handle);
+ OBD_FREE_PTR(export);
+ return ERR_PTR(-EALREADY);
}
}
+
LASSERT(!obd->obd_stopping); /* shouldn't happen, but might race */
- class_incref(obd);
+ 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);
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))
+ lustre_hash_del(exp->exp_obd->obd_uuid_hash,
+ &exp->exp_client_uuid,
+ &exp->exp_uuid_hash);
+
list_del_init(&exp->exp_obd_chain);
list_del_init(&exp->exp_obd_chain_timed);
exp->exp_obd->obd_num_exports--;
spin_unlock(&exp->exp_obd->obd_dev_lock);
+ /* Keep these counter valid always */
+ spin_lock_bh(&exp->exp_obd->obd_processing_task_lock);
+ if (exp->exp_delayed)
+ exp->exp_obd->obd_delayed_clients--;
+ else if (exp->exp_in_recovery)
+ exp->exp_obd->obd_recoverable_clients--;
+ else if (exp->exp_obd->obd_recovering)
+ exp->exp_obd->obd_max_recoverable_clients--;
+ spin_unlock_bh(&exp->exp_obd->obd_processing_task_lock);
class_export_put(exp);
}
EXPORT_SYMBOL(class_unlink_export);
/* Import management functions */
+void class_import_destroy(struct obd_import *imp)
+{
+ ENTRY;
+
+ CDEBUG(D_IOCTL, "destroying import %p for %s\n", imp,
+ imp->imp_obd->obd_name);
+
+ LASSERT(atomic_read(&imp->imp_refcount) == 0);
+
+ 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);
+ EXIT;
+}
+
static void import_handle_addref(void *import)
{
class_import_get(import);
LASSERT(atomic_read(&import->imp_refcount) >= 0);
LASSERT(atomic_read(&import->imp_refcount) < 0x5a5a5a);
atomic_inc(&import->imp_refcount);
- CDEBUG(D_INFO, "import %p refcount=%d\n", import,
- atomic_read(&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 *import)
+void class_import_put(struct obd_import *imp)
{
ENTRY;
- CDEBUG(D_INFO, "import %p refcount=%d\n", import,
- atomic_read(&import->imp_refcount) - 1);
+ LASSERT(atomic_read(&imp->imp_refcount) > 0);
+ LASSERT(atomic_read(&imp->imp_refcount) < 0x5a5a5a);
+ LASSERT(list_empty(&imp->imp_zombie_chain));
- LASSERT(atomic_read(&import->imp_refcount) > 0);
- LASSERT(atomic_read(&import->imp_refcount) < 0x5a5a5a);
- LASSERT(list_empty(&import->imp_zombie_chain));
-
- if (atomic_dec_and_test(&import->imp_refcount)) {
-
- CDEBUG(D_INFO, "final put import %p\n", import);
-
- spin_lock(&obd_zombie_impexp_lock);
- list_add(&import->imp_zombie_chain, &obd_zombie_imports);
- spin_unlock(&obd_zombie_impexp_lock);
+ CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", imp,
+ atomic_read(&imp->imp_refcount) - 1,
+ imp->imp_obd->obd_name);
- if (obd_zombie_impexp_notify != NULL)
- obd_zombie_impexp_notify();
+ if (atomic_dec_and_test(&imp->imp_refcount)) {
+ CDEBUG(D_INFO, "final put import %p\n", imp);
+ obd_zombie_import_add(imp);
}
EXIT;
}
+EXPORT_SYMBOL(class_import_put);
-void class_import_destroy(struct obd_import *import)
-{
- ENTRY;
-
- CDEBUG(D_IOCTL, "destroying import %p\n", import);
-
- LASSERT(atomic_read(&import->imp_refcount) == 0);
-
- ptlrpc_put_connection_superhack(import->imp_connection);
-
- while (!list_empty(&import->imp_conn_list)) {
- struct obd_import_conn *imp_conn;
-
- imp_conn = list_entry(import->imp_conn_list.next,
- struct obd_import_conn, oic_item);
- list_del(&imp_conn->oic_item);
- ptlrpc_put_connection_superhack(imp_conn->oic_conn);
- OBD_FREE(imp_conn, sizeof(*imp_conn));
+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);
}
-
- LASSERT(list_empty(&import->imp_handle.h_link));
- class_decref(import->imp_obd);
- OBD_FREE(import, sizeof(*import));
-
- EXIT;
}
-EXPORT_SYMBOL(class_import_put);
struct obd_import *class_new_import(struct obd_device *obd)
{
spin_lock_init(&imp->imp_lock);
imp->imp_last_success_conn = 0;
imp->imp_state = LUSTRE_IMP_NEW;
- imp->imp_obd = class_incref(obd);
+ imp->imp_obd = class_incref(obd, "import", imp);
+ sema_init(&imp->imp_sec_mutex, 1);
cfs_waitq_init(&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);
CFS_INIT_LIST_HEAD(&imp->imp_conn_list);
CFS_INIT_LIST_HEAD(&imp->imp_handle.h_link);
class_handle_hash(&imp->imp_handle, import_handle_addref);
+ init_imp_at(&imp->imp_at);
- /* the default magic is V1, will be used in connect RPC, and
+ /* 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_V1;
+ imp->imp_msg_magic = LUSTRE_MSG_MAGIC_V2;
return imp;
}
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);
}
EXPORT_SYMBOL(class_connect);
-/* This function removes two references from the export: one for the
- * hash entry and one for the export pointer passed in. The export
- * pointer passed to this function is destroyed should not be used
- * again. */
+/* if export is involved in recovery then clean up related things */
+void class_export_recovery_cleanup(struct obd_export *exp)
+{
+ struct obd_device *obd = exp->exp_obd;
+
+ spin_lock_bh(&obd->obd_processing_task_lock);
+ if (obd->obd_recovering && exp->exp_in_recovery) {
+ spin_lock(&exp->exp_lock);
+ exp->exp_in_recovery = 0;
+ spin_unlock(&exp->exp_lock);
+ obd->obd_connected_clients--;
+ /* each connected client is counted as recoverable */
+ obd->obd_recoverable_clients--;
+ if (exp->exp_req_replay_needed) {
+ spin_lock(&exp->exp_lock);
+ exp->exp_req_replay_needed = 0;
+ spin_unlock(&exp->exp_lock);
+ LASSERT(atomic_read(&obd->obd_req_replay_clients));
+ atomic_dec(&obd->obd_req_replay_clients);
+ }
+ if (exp->exp_lock_replay_needed) {
+ spin_lock(&exp->exp_lock);
+ exp->exp_lock_replay_needed = 0;
+ spin_unlock(&exp->exp_lock);
+ LASSERT(atomic_read(&obd->obd_lock_replay_clients));
+ atomic_dec(&obd->obd_lock_replay_clients);
+ }
+ }
+ spin_unlock_bh(&obd->obd_processing_task_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;
/* 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)
- RETURN(0);
+ if (already_disconnected) {
+ LASSERT(hlist_unhashed(&export->exp_nid_hash));
+ GOTO(no_disconn, already_disconnected);
+ }
CDEBUG(D_IOCTL, "disconnect: cookie "LPX64"\n",
export->exp_handle.h_cookie);
+ if (!hlist_unhashed(&export->exp_nid_hash))
+ lustre_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);
}
-static void class_disconnect_export_list(struct list_head *list, int flags)
+static void class_disconnect_export_list(struct list_head *list,
+ enum obd_option flags)
{
int rc;
- struct lustre_handle fake_conn;
- struct obd_export *fake_exp, *exp;
+ struct obd_export *exp;
ENTRY;
/* 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)) {
continue;
}
- fake_conn.cookie = exp->exp_handle.h_cookie;
- fake_exp = class_conn2export(&fake_conn);
- if (!fake_exp) {
- class_export_put(exp);
- continue;
- }
- fake_exp->exp_flags = flags;
- rc = obd_disconnect(fake_exp);
+ 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);
- if (rc) {
- CDEBUG(D_HA, "disconnecting export %p failed: %d\n",
- exp, rc);
- } else {
- CDEBUG(D_HA, "export %p disconnected\n", exp);
- }
}
EXIT;
}
-static inline int get_exp_flags_from_obd(struct obd_device *obd)
-{
- return ((obd->obd_fail ? OBD_OPT_FAILOVER : 0) |
- (obd->obd_force ? OBD_OPT_FORCE : 0));
-}
-
void class_disconnect_exports(struct obd_device *obd)
{
struct list_head work_list;
ENTRY;
/* Move all of the exports from obd_exports to a work list, en masse. */
+ CFS_INIT_LIST_HEAD(&work_list);
spin_lock(&obd->obd_dev_lock);
- list_add(&work_list, &obd->obd_exports);
- list_del_init(&obd->obd_exports);
+ list_splice_init(&obd->obd_exports, &work_list);
+ list_splice_init(&obd->obd_delayed_exports, &work_list);
spin_unlock(&obd->obd_dev_lock);
- CDEBUG(D_HA, "OBD device %d (%p) has exports, "
- "disconnecting them\n", obd->obd_minor, obd);
- class_disconnect_export_list(&work_list, get_exp_flags_from_obd(obd));
+ 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);
EXIT;
}
EXPORT_SYMBOL(class_disconnect_exports);
/* Remove exports that have not completed recovery.
*/
-void class_disconnect_stale_exports(struct obd_device *obd)
+void class_disconnect_stale_exports(struct obd_device *obd,
+ int (*test_export)(struct obd_export *),
+ enum obd_option flags)
{
struct list_head work_list;
struct list_head *pos, *n;
struct obd_export *exp;
- int cnt = 0;
ENTRY;
CFS_INIT_LIST_HEAD(&work_list);
spin_lock(&obd->obd_dev_lock);
+ obd->obd_stale_clients = 0;
list_for_each_safe(pos, n, &obd->obd_exports) {
exp = list_entry(pos, struct obd_export, exp_obd_chain);
- if (exp->exp_replay_needed) {
- list_del(&exp->exp_obd_chain);
- list_add(&exp->exp_obd_chain, &work_list);
- cnt++;
- }
- }
- spin_unlock(&obd->obd_dev_lock);
-
- CDEBUG(D_ERROR, "%s: disconnecting %d stale clients\n",
- obd->obd_name, cnt);
- class_disconnect_export_list(&work_list, get_exp_flags_from_obd(obd));
- EXIT;
-}
-EXPORT_SYMBOL(class_disconnect_stale_exports);
-
-int oig_init(struct obd_io_group **oig_out)
-{
- struct obd_io_group *oig;
- ENTRY;
-
- OBD_ALLOC(oig, sizeof(*oig));
- if (oig == NULL)
- RETURN(-ENOMEM);
-
- spin_lock_init(&oig->oig_lock);
- oig->oig_rc = 0;
- oig->oig_pending = 0;
- atomic_set(&oig->oig_refcount, 1);
- cfs_waitq_init(&oig->oig_waitq);
- CFS_INIT_LIST_HEAD(&oig->oig_occ_list);
-
- *oig_out = oig;
- RETURN(0);
-};
-EXPORT_SYMBOL(oig_init);
-
-static inline void oig_grab(struct obd_io_group *oig)
-{
- atomic_inc(&oig->oig_refcount);
-}
-
-void oig_release(struct obd_io_group *oig)
-{
- if (atomic_dec_and_test(&oig->oig_refcount))
- OBD_FREE(oig, sizeof(*oig));
-}
-EXPORT_SYMBOL(oig_release);
-
-int oig_add_one(struct obd_io_group *oig, struct oig_callback_context *occ)
-{
- int rc = 0;
- CDEBUG(D_CACHE, "oig %p ready to roll\n", oig);
- spin_lock(&oig->oig_lock);
- if (oig->oig_rc) {
- rc = oig->oig_rc;
- } else {
- oig->oig_pending++;
- if (occ != NULL)
- list_add_tail(&occ->occ_oig_item, &oig->oig_occ_list);
- }
- spin_unlock(&oig->oig_lock);
- oig_grab(oig);
-
- return rc;
-}
-EXPORT_SYMBOL(oig_add_one);
-
-void oig_complete_one(struct obd_io_group *oig,
- struct oig_callback_context *occ, int rc)
-{
- cfs_waitq_t *wake = NULL;
- int old_rc;
-
- spin_lock(&oig->oig_lock);
-
- if (occ != NULL)
- list_del_init(&occ->occ_oig_item);
-
- old_rc = oig->oig_rc;
- if (oig->oig_rc == 0 && rc != 0)
- oig->oig_rc = rc;
-
- if (--oig->oig_pending <= 0)
- wake = &oig->oig_waitq;
-
- spin_unlock(&oig->oig_lock);
-
- CDEBUG(D_CACHE, "oig %p completed, rc %d -> %d via %d, %d now "
- "pending (racey)\n", oig, old_rc, oig->oig_rc, rc,
- oig->oig_pending);
- if (wake)
- cfs_waitq_signal(wake);
- oig_release(oig);
-}
-EXPORT_SYMBOL(oig_complete_one);
-
-static int oig_done(struct obd_io_group *oig)
-{
- int rc = 0;
- spin_lock(&oig->oig_lock);
- if (oig->oig_pending <= 0)
- rc = 1;
- spin_unlock(&oig->oig_lock);
- return rc;
-}
+ if (test_export(exp))
+ continue;
-static void interrupted_oig(void *data)
-{
- struct obd_io_group *oig = data;
- struct oig_callback_context *occ;
-
- spin_lock(&oig->oig_lock);
- /* We need to restart the processing each time we drop the lock, as
- * it is possible other threads called oig_complete_one() to remove
- * an entry elsewhere in the list while we dropped lock. We need to
- * drop the lock because osc_ap_completion() calls oig_complete_one()
- * which re-gets this lock ;-) as well as a lock ordering issue. */
-restart:
- list_for_each_entry(occ, &oig->oig_occ_list, occ_oig_item) {
- if (occ->interrupted)
+ list_move(&exp->exp_obd_chain, &work_list);
+ /* don't count self-export as client */
+ if (obd_uuid_equals(&exp->exp_client_uuid,
+ &exp->exp_obd->obd_uuid))
continue;
- occ->interrupted = 1;
- spin_unlock(&oig->oig_lock);
- occ->occ_interrupted(occ);
- spin_lock(&oig->oig_lock);
- goto restart;
- }
- spin_unlock(&oig->oig_lock);
-}
-int oig_wait(struct obd_io_group *oig)
-{
- struct l_wait_info lwi = LWI_INTR(interrupted_oig, oig);
- int rc;
+ obd->obd_stale_clients++;
+ CDEBUG(D_ERROR, "%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));
+ }
+ spin_unlock(&obd->obd_dev_lock);
- CDEBUG(D_CACHE, "waiting for oig %p\n", oig);
+ CDEBUG(D_HA, "%s: disconnecting %d stale clients\n", obd->obd_name,
+ obd->obd_stale_clients);
- do {
- rc = l_wait_event(oig->oig_waitq, oig_done(oig), &lwi);
- LASSERTF(rc == 0 || rc == -EINTR, "rc: %d\n", rc);
- /* we can't continue until the oig has emptied and stopped
- * referencing state that the caller will free upon return */
- if (rc == -EINTR)
- lwi = (struct l_wait_info){ 0, };
- } while (rc == -EINTR);
-
- LASSERTF(oig->oig_pending == 0,
- "exiting oig_wait(oig = %p) with %d pending\n", oig,
- oig->oig_pending);
-
- CDEBUG(D_CACHE, "done waiting on oig %p rc %d\n", oig, oig->oig_rc);
- return oig->oig_rc;
+ class_disconnect_export_list(&work_list, flags);
+ EXIT;
}
-EXPORT_SYMBOL(oig_wait);
+EXPORT_SYMBOL(class_disconnect_stale_exports);
void class_fail_export(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);
-#define EVICT_BATCH 32
-int obd_export_evict_by_nid(struct obd_device *obd, char *nid)
+int obd_export_evict_by_nid(struct obd_device *obd, const char *nid)
{
- struct obd_export *doomed_exp[EVICT_BATCH] = { NULL };
- struct list_head *p;
- int exports_evicted = 0, num_to_evict = 0, i;
+ struct obd_export *doomed_exp = NULL;
+ int exports_evicted = 0;
-search_again:
- spin_lock(&obd->obd_dev_lock);
- list_for_each(p, &obd->obd_exports) {
- doomed_exp[num_to_evict] = list_entry(p, struct obd_export,
- exp_obd_chain);
- if (strcmp(obd_export_nid2str(doomed_exp[num_to_evict]),
- nid) == 0) {
- class_export_get(doomed_exp[num_to_evict]);
- if (++num_to_evict == EVICT_BATCH)
- break;
- }
- }
- spin_unlock(&obd->obd_dev_lock);
+ lnet_nid_t nid_key = libcfs_str2nid((char *)nid);
- for (i = 0; i < num_to_evict; i++) {
+ do {
+ doomed_exp = lustre_hash_lookup(obd->obd_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++;
CWARN("%s: evict NID '%s' (%s) #%d at adminstrative request\n",
- obd->obd_name, nid, doomed_exp[i]->exp_client_uuid.uuid,
+ obd->obd_name, nid, doomed_exp->exp_client_uuid.uuid,
exports_evicted);
- class_fail_export(doomed_exp[i]);
- class_export_put(doomed_exp[i]);
- }
- if (num_to_evict == EVICT_BATCH) {
- num_to_evict = 0;
- goto search_again;
- }
+ class_fail_export(doomed_exp);
+ class_export_put(doomed_exp);
+ } while (1);
if (!exports_evicted)
CDEBUG(D_HA,"%s: can't disconnect NID '%s': no exports found\n",
}
EXPORT_SYMBOL(obd_export_evict_by_nid);
-int obd_export_evict_by_uuid(struct obd_device *obd, char *uuid)
+int obd_export_evict_by_uuid(struct obd_device *obd, const char *uuid)
{
struct obd_export *doomed_exp = NULL;
- struct list_head *p;
- struct obd_uuid doomed;
+ struct obd_uuid doomed_uuid;
int exports_evicted = 0;
- obd_str2uuid(&doomed, uuid);
-
- spin_lock(&obd->obd_dev_lock);
- list_for_each(p, &obd->obd_exports) {
- doomed_exp = list_entry(p, struct obd_export, exp_obd_chain);
-
- if (obd_uuid_equals(&doomed, &doomed_exp->exp_client_uuid)) {
- class_export_get(doomed_exp);
- break;
- }
- doomed_exp = NULL;
+ obd_str2uuid(&doomed_uuid, uuid);
+ if (obd_uuid_equals(&doomed_uuid, &obd->obd_uuid)) {
+ CERROR("%s: can't evict myself\n", obd->obd_name);
+ return exports_evicted;
}
- spin_unlock(&obd->obd_dev_lock);
+
+ doomed_exp = lustre_hash_lookup(obd->obd_uuid_hash, &doomed_uuid);
if (doomed_exp == NULL) {
CERROR("%s: can't disconnect %s: no exports found\n",
}
EXPORT_SYMBOL(obd_export_evict_by_uuid);
-void obd_zombie_impexp_cull(void)
+/**
+ * kill zombie imports and exports
+ */
+void obd_zombie_impexp_cull(void)
{
struct obd_import *import;
struct obd_export *export;
-
+ ENTRY;
+
do {
- spin_lock (&obd_zombie_impexp_lock);
+ 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(&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,
}
spin_unlock(&obd_zombie_impexp_lock);
-
+
if (import != NULL)
class_import_destroy(import);
class_export_destroy(export);
} while (import != NULL || export != NULL);
+ EXIT;
+}
+
+static struct completion obd_zombie_start;
+static struct completion obd_zombie_stop;
+static unsigned long obd_zombie_flags;
+static cfs_waitq_t obd_zombie_waitq;
+
+enum {
+ OBD_ZOMBIE_STOP = 1 << 1
+};
+
+/**
+ * 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 = list_empty(&obd_zombie_imports) &&
+ list_empty(&obd_zombie_exports) &&
+ !test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags);
+
+ spin_unlock(&obd_zombie_impexp_lock);
+
+ RETURN(rc);
+}
+
+/**
+ * Add export to the obd_zombe thread and notify it.
+ */
+static void obd_zombie_export_add(struct obd_export *exp) {
+ spin_lock(&obd_zombie_impexp_lock);
+ LASSERT(list_empty(&exp->exp_obd_chain));
+ list_add(&exp->exp_obd_chain, &obd_zombie_exports);
+ spin_unlock(&obd_zombie_impexp_lock);
+
+ if (obd_zombie_impexp_notify != NULL)
+ obd_zombie_impexp_notify();
}
-EXPORT_SYMBOL(obd_zombie_impexp_cull);
-void obd_zombie_impexp_init(void)
+/**
+ * Add import to the obd_zombe thread and notify it.
+ */
+static void obd_zombie_import_add(struct obd_import *imp) {
+ LASSERT(imp->imp_sec == NULL);
+ spin_lock(&obd_zombie_impexp_lock);
+ LASSERT(list_empty(&imp->imp_zombie_chain));
+ list_add(&imp->imp_zombie_chain, &obd_zombie_imports);
+ spin_unlock(&obd_zombie_impexp_lock);
+
+ if (obd_zombie_impexp_notify != NULL)
+ obd_zombie_impexp_notify();
+}
+
+/**
+ * notify import/export destroy thread about new zombie.
+ */
+static void obd_zombie_impexp_notify(void)
{
- INIT_LIST_HEAD(&obd_zombie_imports);
- INIT_LIST_HEAD(&obd_zombie_exports);
+ cfs_waitq_signal(&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 = list_empty(&obd_zombie_imports) &&
+ list_empty(&obd_zombie_exports);
+ 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 };
+ l_wait_event(obd_zombie_waitq, obd_zombie_is_idle(), &lwi);
+}
+EXPORT_SYMBOL(obd_zombie_barrier);
+
+#ifdef __KERNEL__
+
+/**
+ * destroy zombie export/import thread.
+ */
+static int obd_zombie_impexp_thread(void *unused)
+{
+ int rc;
+
+ if ((rc = cfs_daemonize_ctxt("obd_zombid"))) {
+ complete(&obd_zombie_start);
+ RETURN(rc);
+ }
+
+ complete(&obd_zombie_start);
+
+ 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.
+ */
+ cfs_waitq_signal(&obd_zombie_waitq);
+ }
+
+ complete(&obd_zombie_stop);
+
+ RETURN(0);
+}
+
+#else /* ! KERNEL */
+
+static atomic_t zombie_recur = ATOMIC_INIT(0);
+static void *obd_zombie_impexp_work_cb;
+static void *obd_zombie_impexp_idle_cb;
+
+int obd_zombie_impexp_kill(void *arg)
+{
+ int rc = 0;
+
+ if (atomic_inc_return(&zombie_recur) == 1) {
+ obd_zombie_impexp_cull();
+ rc = 1;
+ }
+ atomic_dec(&zombie_recur);
+ return rc;
+}
+
+#endif
+
+/**
+ * start destroy zombie import/export thread
+ */
+int obd_zombie_impexp_init(void)
+{
+ int rc;
+
+ CFS_INIT_LIST_HEAD(&obd_zombie_imports);
+ CFS_INIT_LIST_HEAD(&obd_zombie_exports);
spin_lock_init(&obd_zombie_impexp_lock);
+ init_completion(&obd_zombie_start);
+ init_completion(&obd_zombie_stop);
+ cfs_waitq_init(&obd_zombie_waitq);
+
+#ifdef __KERNEL__
+ rc = cfs_kernel_thread(obd_zombie_impexp_thread, NULL, 0);
+ if (rc < 0)
+ RETURN(rc);
+
+ wait_for_completion(&obd_zombie_start);
+#else
+
+ obd_zombie_impexp_work_cb =
+ liblustre_register_wait_callback("obd_zombi_impexp_kill",
+ &obd_zombie_impexp_kill, NULL);
+
+ obd_zombie_impexp_idle_cb =
+ liblustre_register_idle_callback("obd_zombi_impexp_check",
+ &obd_zombie_impexp_check, NULL);
+ rc = 0;
+#endif
+ RETURN(rc);
+}
+/**
+ * stop destroy zombie import/export thread
+ */
+void obd_zombie_impexp_stop(void)
+{
+ set_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags);
+ obd_zombie_impexp_notify();
+#ifdef __KERNEL__
+ wait_for_completion(&obd_zombie_stop);
+#else
+ liblustre_deregister_wait_callback(obd_zombie_impexp_work_cb);
+ liblustre_deregister_idle_callback(obd_zombie_impexp_idle_cb);
+#endif
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff