1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* -*- mode: c; c-basic-offset: 8; -*-
3 * vim: noexpandtab sw=8 ts=8 sts=0:
4 *
5 * userdlm.h
6 *
7 * Userspace dlm defines
8 *
9 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
10 */
11
12
13 #ifndef USERDLM_H
14 #define USERDLM_H
15
16 #include <linux/module.h>
17 #include <linux/fs.h>
18 #include <linux/types.h>
19 #include <linux/workqueue.h>
20
21 /* user_lock_res->l_flags flags. */
22 #define USER_LOCK_ATTACHED (0x00000001) /* we have initialized
23 * the lvb */
24 #define USER_LOCK_BUSY (0x00000002) /* we are currently in
25 * dlm_lock */
26 #define USER_LOCK_BLOCKED (0x00000004) /* blocked waiting to
27 * downconvert*/
28 #define USER_LOCK_IN_TEARDOWN (0x00000008) /* we're currently
29 * destroying this
30 * lock. */
31 #define USER_LOCK_QUEUED (0x00000010) /* lock is on the
32 * workqueue */
33 #define USER_LOCK_IN_CANCEL (0x00000020)
34
35 struct user_lock_res {
36 spinlock_t l_lock;
37
38 int l_flags;
39
40 #define USER_DLM_LOCK_ID_MAX_LEN 32
41 char l_name[USER_DLM_LOCK_ID_MAX_LEN];
42 int l_namelen;
43 int l_level;
44 unsigned int l_ro_holders;
45 unsigned int l_ex_holders;
46 struct ocfs2_dlm_lksb l_lksb;
47
48 int l_requested;
49 int l_blocking;
50
51 wait_queue_head_t l_event;
52
53 struct work_struct l_work;
54 };
55
56 extern struct workqueue_struct *user_dlm_worker;
57
58 void user_dlm_lock_res_init(struct user_lock_res *lockres,
59 struct dentry *dentry);
60 int user_dlm_destroy_lock(struct user_lock_res *lockres);
61 int user_dlm_cluster_lock(struct user_lock_res *lockres,
62 int level,
63 int lkm_flags);
64 void user_dlm_cluster_unlock(struct user_lock_res *lockres,
65 int level);
66 void user_dlm_write_lvb(struct inode *inode,
67 const char *val,
68 unsigned int len);
69 bool user_dlm_read_lvb(struct inode *inode, char *val);
70 struct ocfs2_cluster_connection *user_dlm_register(const struct qstr *name);
71 void user_dlm_unregister(struct ocfs2_cluster_connection *conn);
72 void user_dlm_set_locking_protocol(void);
73
74 struct dlmfs_inode_private {
75 struct ocfs2_cluster_connection *ip_conn;
76
77 struct user_lock_res ip_lockres; /* unused for directories. */
78 struct inode *ip_parent;
79
80 struct inode ip_vfs_inode;
81 };
82
83 static inline struct dlmfs_inode_private *
DLMFS_I(struct inode * inode)84 DLMFS_I(struct inode *inode)
85 {
86 return container_of(inode,
87 struct dlmfs_inode_private,
88 ip_vfs_inode);
89 }
90
91 struct dlmfs_filp_private {
92 int fp_lock_level;
93 };
94
95 #define DLMFS_MAGIC 0x76a9f425
96
97 #endif /* USERDLM_H */
98