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Nathan Rutman authoredi=tappro i=fanyong block reactivating mgc import until all deactivates complete Only an issue when failing back MDT/MGS to itself (testing)
Nathan Rutman authoredi=tappro i=fanyong block reactivating mgc import until all deactivates complete Only an issue when failing back MDT/MGS to itself (testing)
genops.c 45.22 KiB
/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=8:tabstop=8:
*
* Copyright (c) 2001-2003 Cluster File Systems, Inc.
*
* This file is part of the Lustre file system, http://www.lustre.org
* Lustre is a trademark of Cluster File Systems, Inc.
*
* 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.
*
* 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.
*
* 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.
*
* These are the only exported functions, they provide some generic
* infrastructure for managing object devices
*/
#define DEBUG_SUBSYSTEM S_CLASS
#ifndef __KERNEL__
#include <liblustre.h>
#endif
#include <obd_ost.h>
#include <obd_class.h>
#include <lprocfs_status.h>
extern struct list_head obd_types;
spinlock_t obd_types_lock;
cfs_mem_cache_t *obd_device_cachep;
cfs_mem_cache_t *obdo_cachep;
EXPORT_SYMBOL(obdo_cachep);
cfs_mem_cache_t *import_cachep;
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);
int (*ptlrpc_put_connection_superhack)(struct ptlrpc_connection *c);
/*
* 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(obd, obd_device_cachep);
if (obd != NULL) {
obd->obd_magic = OBD_DEVICE_MAGIC;
}
return obd;
}
EXPORT_SYMBOL(obd_device_alloc);
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);
OBD_SLAB_FREE_PTR(obd, obd_device_cachep);
}
EXPORT_SYMBOL(obd_device_free);
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;
}
struct obd_type *class_get_type(const char *name)
{
struct obd_type *type = class_search_type(name);
#ifdef CONFIG_KMOD
if (!type) {
const char *modname = name;
if (!request_module(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);
}
}
#endif
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;
}
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);
}
#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;
/* 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, rc);
*(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);
#ifdef LPROCFS
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, rc);
}
#endif
if (ldt != NULL) {
type->typ_lu = ldt;
rc = ldt->ldt_ops->ldto_init(ldt);
if (rc != 0)
GOTO (failed, rc);
}
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);
}
int class_unregister_type(const char *name)
{
struct obd_type *type = class_search_type(name);
ENTRY;
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)
type->typ_lu->ldt_ops->ldto_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 */
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) {
class_put_type(type);
RETURN(ERR_PTR(-ENOMEM));
}
LASSERT(newdev->obd_magic == OBD_DEVICE_MAGIC);
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)) {
CERROR("Device %s already exists, won't add\n", name);
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;
memcpy(result->obd_name, name, strlen(name));
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);
} else {
CDEBUG(D_IOCTL, "Adding new device %s (%p)\n",
result->obd_name, result);
}
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 obd_type name =%s\n",
obd->obd_name,obd->obd_type->typ_name);
spin_lock(&obd_dev_lock);
obd_devs[obd->obd_minor] = NULL;
spin_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;
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) {
/* Make sure we finished attaching before we give
out any references */
LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
if (obd->obd_attached) {
spin_unlock(&obd_dev_lock);
return i;
} break;
}
}
spin_unlock(&obd_dev_lock);
return -1;
}
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);
}
int class_uuid2dev(struct obd_uuid *uuid)
{
int i;
spin_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);
spin_unlock(&obd_dev_lock);
return i;
}
}
spin_unlock(&obd_dev_lock);
return -1;
}
struct obd_device *class_uuid2obd(struct obd_uuid *uuid)
{
int dev = class_uuid2dev(uuid);
if (dev < 0)
return NULL;
return class_num2obd(dev);
}
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;
}
void class_obd_list(void)
{
char *status;
int i;
spin_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));
}
spin_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;
spin_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)) {
spin_unlock(&obd_dev_lock);
return obd;
}
}
}
spin_unlock(&obd_dev_lock);
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
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;
spin_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;
spin_unlock(&obd_dev_lock);
return obd;
}
}
spin_unlock(&obd_dev_lock);
return NULL;
}
void obd_cleanup_caches(void)
{
int rc;
ENTRY;
if (obd_device_cachep) {
rc = cfs_mem_cache_destroy(obd_device_cachep);
LASSERTF(rc == 0, "Cannot destropy ll_obd_device_cache: rc %d\n", rc);
obd_device_cachep = NULL;
}
if (obdo_cachep) {
rc = cfs_mem_cache_destroy(obdo_cachep);
LASSERTF(rc == 0, "Cannot destory ll_obdo_cache\n");
obdo_cachep = NULL;
}
if (import_cachep) {
rc = cfs_mem_cache_destroy(import_cachep);
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;
}
int obd_init_caches(void)
{
ENTRY;
LASSERT(obd_device_cachep == NULL);
obd_device_cachep = cfs_mem_cache_create("ll_obd_dev_cache",
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);
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);
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();
RETURN(-ENOMEM);
}
/* map connection to client */
struct obd_export *class_conn2export(struct lustre_handle *conn)
{
struct obd_export *export;
ENTRY;
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 "LPX64"\n", conn->cookie);
export = class_handle2object(conn->cookie);
RETURN(export);
}
struct obd_device *class_exp2obd(struct obd_export *exp)
{
if (exp)
return exp->exp_obd;
return NULL;
}
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;
}
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;
}
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 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)
{
struct obd_device *obd = exp->exp_obd;
ENTRY;
LASSERT (atomic_read(&exp->exp_refcount) == 0);
CDEBUG(D_IOCTL, "destroying export %p/%s for %s\n", exp,
exp->exp_client_uuid.uuid, obd->obd_name);
LASSERT(obd != NULL);
/* "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));
obd_destroy_export(exp);
OBD_FREE_RCU(exp, sizeof(*exp), &exp->exp_handle);
class_decref(obd);
EXIT;
}
/* 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, *tmp;
OBD_ALLOC(export, sizeof(*export));
if (!export)
return ERR_PTR(-ENOMEM);
export->exp_conn_cnt = 0;
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);
CFS_INIT_LIST_HEAD(&export->exp_handle.h_link);
class_handle_hash(&export->exp_handle, export_handle_addref);
export->exp_last_request_time = CURRENT_SECONDS;
spin_lock_init(&export->exp_lock);
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);
}
}
}
LASSERT(!obd->obd_stopping); /* shouldn't happen, but might race */
class_incref(obd);
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);
return export;
}
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);
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);
class_export_put(exp);
}
EXPORT_SYMBOL(class_unlink_export);
/* Import management functions */
static void import_handle_addref(void *import)
{
class_import_get(import);
}
struct obd_import *class_import_get(struct obd_import *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));
return import;
}
EXPORT_SYMBOL(class_import_get);
void class_import_put(struct obd_import *import){
ENTRY;
CDEBUG(D_INFO, "import %p refcount=%d\n", import,
atomic_read(&import->imp_refcount) - 1);
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);
if (obd_zombie_impexp_notify != NULL)
obd_zombie_impexp_notify();
}
EXIT;
}
void class_import_destroy(struct obd_import *import)
{
ENTRY;
CDEBUG(D_IOCTL, "destroying import %p for %s\n", import,
import->imp_obd->obd_name);
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));
}
LASSERT(import->imp_sec == NULL);
class_decref(import->imp_obd);
OBD_FREE_RCU(import, sizeof(*import), &import->imp_handle);
EXIT;
}
EXPORT_SYMBOL(class_import_put);
struct obd_import *class_new_import(struct obd_device *obd)
{
struct obd_import *imp;
OBD_ALLOC(imp, sizeof(*imp));
if (imp == NULL)
return NULL;
CFS_INIT_LIST_HEAD(&imp->imp_zombie_chain);
CFS_INIT_LIST_HEAD(&imp->imp_replay_list);
CFS_INIT_LIST_HEAD(&imp->imp_sending_list);
CFS_INIT_LIST_HEAD(&imp->imp_delayed_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);
cfs_waitq_init(&imp->imp_recovery_waitq);
atomic_set(&imp->imp_refcount, 2);
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);
/* the default magic is V1, will be used in connect RPC, and
* then adjusted according to the flags in request/reply. */
imp->imp_msg_magic = LUSTRE_MSG_MAGIC_V1;
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);
/* 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);
ENTRY;
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 "LPX64"\n",
cluuid->uuid, conn->cookie);
RETURN(0);
}
EXPORT_SYMBOL(class_connect);
/* 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 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. */
int class_disconnect(struct obd_export *export)
{
int already_disconnected;
ENTRY;
if (export == NULL) {
fixme();
CDEBUG(D_IOCTL, "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)
RETURN(0);
CDEBUG(D_IOCTL, "disconnect: cookie "LPX64"\n",
export->exp_handle.h_cookie);
class_export_recovery_cleanup(export);
class_unlink_export(export);
class_export_put(export);
RETURN(0);
}
static void class_disconnect_export_list(struct list_head *list, int flags)
{
int rc;
struct lustre_handle fake_conn;
struct obd_export *fake_exp, *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);
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;
}
fake_conn.cookie = exp->exp_handle.h_cookie;
fake_exp = class_conn2export(&fake_conn);
if (!fake_exp) {
class_export_put(exp);
continue;
}
spin_lock(&fake_exp->exp_lock);
fake_exp->exp_flags = flags;
spin_unlock(&fake_exp->exp_lock);
rc = obd_disconnect(fake_exp);
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. */
spin_lock(&obd->obd_dev_lock);
list_add(&work_list, &obd->obd_exports);
list_del_init(&obd->obd_exports);
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,
get_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.
*/
int class_disconnect_stale_exports(struct obd_device *obd,
int (*test_export)(struct obd_export *))
{
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);
list_for_each_safe(pos, n, &obd->obd_exports) {
exp = list_entry(pos, struct obd_export, exp_obd_chain);
if (test_export(exp))
continue;
list_del(&exp->exp_obd_chain);
list_add(&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;
cnt++;
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_ERROR, "%s: disconnecting %d stale clients\n",
obd->obd_name, cnt);
class_disconnect_export_list(&work_list, get_exp_flags_from_obd(obd));
RETURN(cnt);
}
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;
}
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)
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;
CDEBUG(D_CACHE, "waiting for oig %p\n", oig);
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;
}
EXPORT_SYMBOL(oig_wait);
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();
/* 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);
}
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);
#define EVICT_BATCH 32
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;
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);
for (i = 0; i < num_to_evict; i++) {
exports_evicted++;
CWARN("%s: evict NID '%s' (%s) #%d at adminstrative request\n",
obd->obd_name, nid, doomed_exp[i]->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;
}
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 obd_export *doomed_exp = NULL;
struct list_head *p;
struct obd_uuid doomed;
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;
}
spin_unlock(&obd->obd_dev_lock);
if (doomed_exp == NULL) { CERROR("%s: can't disconnect %s: no exports found\n",
obd->obd_name, uuid);
} else {
CWARN("%s: evicting %s at adminstrative request\n",
obd->obd_name, doomed_exp->exp_client_uuid.uuid);
class_fail_export(doomed_exp);
class_export_put(doomed_exp);
exports_evicted++;
}
return exports_evicted;
}
EXPORT_SYMBOL(obd_export_evict_by_uuid);
void obd_zombie_impexp_cull(void)
{
struct obd_import *import;
struct obd_export *export;
ENTRY;
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(&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);
if (export != NULL)
class_export_destroy(export);
} while (import != NULL || export != NULL);
EXIT;
}
EXPORT_SYMBOL(obd_zombie_impexp_cull);
void obd_zombie_impexp_init(void)
{
INIT_LIST_HEAD(&obd_zombie_imports);
INIT_LIST_HEAD(&obd_zombie_exports);
spin_lock_init(&obd_zombie_impexp_lock);
}