4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2011, 2012, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
33 #ifndef __LUSTRE_HANDLES_H_
34 #define __LUSTRE_HANDLES_H_
36 /** \defgroup handles handles
41 #include <linux/atomic.h>
42 #include <linux/list.h>
43 #include <linux/rcupdate.h>
44 #include <linux/spinlock.h>
45 #include <linux/types.h>
47 #include "../../include/linux/libcfs/libcfs.h"
49 struct portals_handle_ops {
50 void (*hop_addref)(void *object);
51 void (*hop_free)(void *object, int size);
54 /* These handles are most easily used by having them appear at the very top of
55 * whatever object that you want to make handles for. ie:
58 * struct portals_handle handle;
62 * Now you're able to assign the results of cookie2handle directly to an
63 * ldlm_lock. If it's not at the top, you'll want to use container_of()
64 * to compute the start of the structure based on the handle field.
66 struct portals_handle {
67 struct list_head h_link;
70 struct portals_handle_ops *h_ops;
72 /* newly added fields to handle the RCU issue. -jxiong */
73 struct rcu_head h_rcu;
75 unsigned int h_size:31;
81 /* Add a handle to the hash table */
82 void class_handle_hash(struct portals_handle *,
83 struct portals_handle_ops *ops);
84 void class_handle_unhash(struct portals_handle *);
85 void *class_handle2object(__u64 cookie, const void *owner);
86 void class_handle_free_cb(struct rcu_head *rcu);
87 int class_handle_init(void);
88 void class_handle_cleanup(void);