1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * userdlm.h
4 *
5 * Userspace dlm defines
6 *
7 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
8 */
9
10
11#ifndef USERDLM_H
12#define USERDLM_H
13
14#include <linux/module.h>
15#include <linux/fs.h>
16#include <linux/types.h>
17#include <linux/workqueue.h>
18
19/* user_lock_res->l_flags flags. */
20#define USER_LOCK_ATTACHED (0x00000001) /* we have initialized
21 * the lvb */
22#define USER_LOCK_BUSY (0x00000002) /* we are currently in
23 * dlm_lock */
24#define USER_LOCK_BLOCKED (0x00000004) /* blocked waiting to
25 * downconvert*/
26#define USER_LOCK_IN_TEARDOWN (0x00000008) /* we're currently
27 * destroying this
28 * lock. */
29#define USER_LOCK_QUEUED (0x00000010) /* lock is on the
30 * workqueue */
31#define USER_LOCK_IN_CANCEL (0x00000020)
32
33struct user_lock_res {
34 spinlock_t l_lock;
35
36 int l_flags;
37
38#define USER_DLM_LOCK_ID_MAX_LEN 32
39 char l_name[USER_DLM_LOCK_ID_MAX_LEN];
40 int l_namelen;
41 int l_level;
42 unsigned int l_ro_holders;
43 unsigned int l_ex_holders;
44 struct ocfs2_dlm_lksb l_lksb;
45
46 int l_requested;
47 int l_blocking;
48
49 wait_queue_head_t l_event;
50
51 struct work_struct l_work;
52};
53
54extern struct workqueue_struct *user_dlm_worker;
55
56void user_dlm_lock_res_init(struct user_lock_res *lockres,
57 struct dentry *dentry);
58int user_dlm_destroy_lock(struct user_lock_res *lockres);
59int user_dlm_cluster_lock(struct user_lock_res *lockres,
60 int level,
61 int lkm_flags);
62void user_dlm_cluster_unlock(struct user_lock_res *lockres,
63 int level);
64void user_dlm_write_lvb(struct inode *inode,
65 const char *val,
66 unsigned int len);
67bool user_dlm_read_lvb(struct inode *inode, char *val);
68struct ocfs2_cluster_connection *user_dlm_register(const struct qstr *name);
69void user_dlm_unregister(struct ocfs2_cluster_connection *conn);
70void user_dlm_set_locking_protocol(void);
71
72struct dlmfs_inode_private {
73 struct ocfs2_cluster_connection *ip_conn;
74
75 struct user_lock_res ip_lockres; /* unused for directories. */
76 struct inode *ip_parent;
77
78 struct inode ip_vfs_inode;
79};
80
81static inline struct dlmfs_inode_private *
82DLMFS_I(struct inode *inode)
83{
84 return container_of(inode,
85 struct dlmfs_inode_private,
86 ip_vfs_inode);
87}
88
89struct dlmfs_filp_private {
90 int fp_lock_level;
91};
92
93#define DLMFS_MAGIC 0x76a9f425
94
95#endif /* USERDLM_H */
96

source code of linux/fs/ocfs2/dlmfs/userdlm.h