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1822 1823 1824 1825 1826 | /*
* 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 <obd_ost.h>
#include <obd_class.h>
#include <lprocfs_status.h>
extern struct list_head obd_types;
spinlock_t obd_types_lock;
struct kmem_cache *obd_device_cachep;
struct kmem_cache *obdo_cachep;
EXPORT_SYMBOL(obdo_cachep);
struct kmem_cache *import_cachep;
struct list_head obd_zombie_imports;
struct list_head obd_zombie_exports;
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_IO);
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, 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 = lu_device_type_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;
}
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)
GOTO(out_type, result = ERR_PTR(-ENOMEM));
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());
GOTO(out, result = ERR_PTR(-EOVERFLOW));
}
if (IS_ERR(result))
GOTO(out, result);
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, __FUNCTION__, 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, __FUNCTION__, 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, -ENOMEM);
LASSERT(obdo_cachep == NULL);
obdo_cachep = kmem_cache_create("ll_obdo_cache", sizeof(struct obdo),
0, 0, NULL);
if (!obdo_cachep)
GOTO(out, -ENOMEM);
LASSERT(import_cachep == NULL);
import_cachep = kmem_cache_create("ll_import_cache",
sizeof(struct obd_import),
0, 0, NULL);
if (!import_cachep)
GOTO(out, -ENOMEM);
LASSERT(capa_cachep == NULL);
capa_cachep = kmem_cache_create("capa_cache",
sizeof(struct obd_capa), 0, 0, NULL);
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;
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;
}
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;
cfs_hash_t *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 = cfs_time_current_sec();
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)
GOTO(exit_unlock, rc = -ENODEV);
hash = cfs_hash_getref(obd->obd_uuid_hash);
if (hash == NULL)
GOTO(exit_unlock, rc = -ENODEV);
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);
GOTO(exit_err, rc = -EALREADY);
}
}
spin_lock(&obd->obd_dev_lock);
if (obd->obd_stopping) {
cfs_hash_del(hash, cluuid, &export->exp_uuid_hash);
GOTO(exit_unlock, rc = -ENODEV);
}
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 */
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);
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 "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(&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);
/** Cleanup req replay fields */
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);
}
/** Cleanup lock replay data */
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);
}
}
/* 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, already_disconnected);
}
CDEBUG(D_IOCTL, "disconnect: cookie "LPX64"\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)
{
cfs_hash_t *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)
{
cfs_hash_t *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 "LPU64"\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);
schedule_timeout_and_set_state(TASK_UNINTERRUPTIBLE,
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 = 0;
/**
* 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_zombe 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_zombe 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_zomebie_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);
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