| /* |
| * 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 "../../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; |
| 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; |
| }; |
| |
| #define RCU2HANDLE(rcu) container_of(rcu, struct portals_handle, h_rcu) |
| |
| /* 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); |
| void class_handle_free_cb(struct rcu_head *rcu); |
| int class_handle_init(void); |
| void class_handle_cleanup(void); |
| |
| /** @} handles */ |
| |
| #endif |