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.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
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30 * Copyright (c) 2012, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
37 #ifndef __LUSTRE_HANDLES_H_
38 #define __LUSTRE_HANDLES_H_
40 /** \defgroup handles handles
45 #include <linux/lustre_handles.h>
47 #include <libcfs/libcfs.h>
50 struct portals_handle_ops {
51 void (*hop_addref)(void *object);
52 void (*hop_free)(void *object, int size);
55 /* These handles are most easily used by having them appear at the very top of
56 * whatever object that you want to make handles for. ie:
59 * struct portals_handle handle;
63 * Now you're able to assign the results of cookie2handle directly to an
64 * ldlm_lock. If it's not at the top, you'll want to use container_of()
65 * 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 */
75 unsigned int h_size:31;
78 #define RCU2HANDLE(rcu) container_of(rcu, struct portals_handle, h_rcu)
82 /* Add a handle to the hash table */
83 void class_handle_hash(struct portals_handle *,
84 struct portals_handle_ops *ops);
85 void class_handle_unhash(struct portals_handle *);
86 void class_handle_hash_back(struct portals_handle *);
87 void *class_handle2object(__u64 cookie, const void *owner);
88 void class_handle_free_cb(cfs_rcu_head_t *);
89 int class_handle_init(void);
90 void class_handle_cleanup(void);