diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/include/lustre_handles.h')
| -rw-r--r-- | drivers/staging/lustre/lustre/include/lustre_handles.h | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lustre/include/lustre_handles.h b/drivers/staging/lustre/lustre/include/lustre_handles.h new file mode 100644 index 000000000000..fcd40f33426a --- /dev/null +++ b/drivers/staging/lustre/lustre/include/lustre_handles.h @@ -0,0 +1,93 @@ +/* + * 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) 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/lustre_handles.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; + struct portals_handle_ops *h_ops; + + /* newly added fields to handle the RCU issue. -jxiong */ + cfs_rcu_head_t 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_handle_hash_back(struct portals_handle *); +void *class_handle2object(__u64 cookie); +void class_handle_free_cb(cfs_rcu_head_t *); +int class_handle_init(void); +void class_handle_cleanup(void); + +/** @} handles */ + +#endif |