Root/fs/ocfs2/dlmfs/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) /* we have 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
49struct 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_namelen;
57    int l_level;
58    unsigned int l_ro_holders;
59    unsigned int l_ex_holders;
60    struct ocfs2_dlm_lksb l_lksb;
61
62    int l_requested;
63    int l_blocking;
64
65    wait_queue_head_t l_event;
66
67    struct work_struct l_work;
68};
69
70extern struct workqueue_struct *user_dlm_worker;
71
72void user_dlm_lock_res_init(struct user_lock_res *lockres,
73                struct dentry *dentry);
74int user_dlm_destroy_lock(struct user_lock_res *lockres);
75int user_dlm_cluster_lock(struct user_lock_res *lockres,
76              int level,
77              int lkm_flags);
78void user_dlm_cluster_unlock(struct user_lock_res *lockres,
79                 int level);
80void user_dlm_write_lvb(struct inode *inode,
81            const char *val,
82            unsigned int len);
83ssize_t user_dlm_read_lvb(struct inode *inode,
84              char *val,
85              unsigned int len);
86struct ocfs2_cluster_connection *user_dlm_register(struct qstr *name);
87void user_dlm_unregister(struct ocfs2_cluster_connection *conn);
88void user_dlm_set_locking_protocol(void);
89
90struct dlmfs_inode_private {
91    struct ocfs2_cluster_connection *ip_conn;
92
93    struct user_lock_res ip_lockres; /* unused for directories. */
94    struct inode *ip_parent;
95
96    struct inode ip_vfs_inode;
97};
98
99static inline struct dlmfs_inode_private *
100DLMFS_I(struct inode *inode)
101{
102        return container_of(inode,
103                struct dlmfs_inode_private,
104                ip_vfs_inode);
105}
106
107struct dlmfs_filp_private {
108    int fp_lock_level;
109};
110
111#define DLMFS_MAGIC 0x76a9f425
112
113#endif /* USERDLM_H */
114

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