[PATCH] OCFS2: The Second Oracle Cluster Filesystem
[linux-2.6.git] / fs / ocfs2 / dlm / userdlm.h
1 /* -*- mode: c; c-basic-offset: 8; -*-
2  * vim: noexpandtab sw=8 ts=8 sts=0:
3  *
4  * userdlm.h
5  *
6  * Userspace dlm defines
7  *
8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
9  *
10  * This program is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU General Public
12  * License as published by the Free Software Foundation; either
13  * version 2 of the License, or (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18  * General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public
21  * License along with this program; if not, write to the
22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23  * Boston, MA 021110-1307, USA.
24  */
25
26
27 #ifndef USERDLM_H
28 #define USERDLM_H
29
30 #include <linux/module.h>
31 #include <linux/fs.h>
32 #include <linux/types.h>
33 #include <linux/workqueue.h>
34
35 /* user_lock_res->l_flags flags. */
36 #define USER_LOCK_ATTACHED      (0x00000001) /* have we initialized
37                                                * the lvb */
38 #define USER_LOCK_BUSY          (0x00000002) /* we are currently in
39                                                * dlm_lock */
40 #define USER_LOCK_BLOCKED       (0x00000004) /* blocked waiting to
41                                               * downconvert*/
42 #define USER_LOCK_IN_TEARDOWN   (0x00000008) /* we're currently
43                                               * destroying this
44                                               * lock. */
45 #define USER_LOCK_QUEUED        (0x00000010) /* lock is on the
46                                               * workqueue */
47 #define USER_LOCK_IN_CANCEL     (0x00000020)
48
49 struct user_lock_res {
50         spinlock_t               l_lock;
51
52         int                      l_flags;
53
54 #define USER_DLM_LOCK_ID_MAX_LEN  32
55         char                     l_name[USER_DLM_LOCK_ID_MAX_LEN];
56         int                      l_level;
57         unsigned int             l_ro_holders;
58         unsigned int             l_ex_holders;
59         struct dlm_lockstatus    l_lksb;
60
61         int                      l_requested;
62         int                      l_blocking;
63
64         wait_queue_head_t        l_event;
65
66         struct work_struct       l_work;
67 };
68
69 extern struct workqueue_struct *user_dlm_worker;
70
71 void user_dlm_lock_res_init(struct user_lock_res *lockres,
72                             struct dentry *dentry);
73 int user_dlm_destroy_lock(struct user_lock_res *lockres);
74 int user_dlm_cluster_lock(struct user_lock_res *lockres,
75                           int level,
76                           int lkm_flags);
77 void user_dlm_cluster_unlock(struct user_lock_res *lockres,
78                              int level);
79 void user_dlm_write_lvb(struct inode *inode,
80                         const char *val,
81                         unsigned int len);
82 void user_dlm_read_lvb(struct inode *inode,
83                        char *val,
84                        unsigned int len);
85 struct dlm_ctxt *user_dlm_register_context(struct qstr *name);
86 void user_dlm_unregister_context(struct dlm_ctxt *dlm);
87
88 struct dlmfs_inode_private {
89         struct dlm_ctxt             *ip_dlm;
90
91         struct user_lock_res ip_lockres; /* unused for directories. */
92         struct inode         *ip_parent;
93
94         struct inode         ip_vfs_inode;
95 };
96
97 static inline struct dlmfs_inode_private *
98 DLMFS_I(struct inode *inode)
99 {
100         return container_of(inode,
101                             struct dlmfs_inode_private,
102                             ip_vfs_inode);
103 }
104
105 struct dlmfs_filp_private {
106         int                  fp_lock_level;
107 };
108
109 #define DLMFS_MAGIC     0x76a9f425
110
111 #endif /* USERDLM_H */