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// SPDX-License-Identifier: GPL-2.0
/*
* 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.gnu.org/licenses/gpl-2.0.html
*
* GPL HEADER END
*/
/*
* Copyright (c) 2007, 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.
*/
#ifndef __LUSTRE_HANDLES_H_
#define __LUSTRE_HANDLES_H_
/** \defgroup handles handles
*
* @{
*/
#include <linux/atomic.h>
#include <linux/list.h>
#include <linux/rcupdate.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/libcfs/libcfs.h>
struct portals_handle_ops {
void (*hop_addref)(void *object);
void (*hop_free)(void *object, int size);
};
/* These handles are most easily used by having them appear at the very top of
* whatever object that you want to make handles for. ie:
*
* struct ldlm_lock {
* struct portals_handle handle;
* ...
* };
*
* Now you're able to assign the results of cookie2handle directly to an
* ldlm_lock. If it's not at the top, you'll want to use container_of()
* to compute the start of the structure based on the handle field.
*/
struct portals_handle {
struct list_head h_link;
__u64 h_cookie;
const void *h_owner;
struct portals_handle_ops *h_ops;
/* newly added fields to handle the RCU issue. -jxiong */
struct rcu_head h_rcu;
spinlock_t h_lock;
unsigned int h_size:31;
unsigned int h_in:1;
};
/* handles.c */
/* Add a handle to the hash table */
void class_handle_hash(struct portals_handle *,
struct portals_handle_ops *ops);
void class_handle_unhash(struct portals_handle *);
void *class_handle2object(__u64 cookie, const void *owner);
void class_handle_free_cb(struct rcu_head *rcu);
int class_handle_init(void);
void class_handle_cleanup(void);
/** @} handles */
#endif
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