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 
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_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 
70 extern struct workqueue_struct *user_dlm_worker;
71 
72 void user_dlm_lock_res_init(struct user_lock_res *lockres,
73 			    struct dentry *dentry);
74 int user_dlm_destroy_lock(struct user_lock_res *lockres);
75 int user_dlm_cluster_lock(struct user_lock_res *lockres,
76 			  int level,
77 			  int lkm_flags);
78 void user_dlm_cluster_unlock(struct user_lock_res *lockres,
79 			     int level);
80 void user_dlm_write_lvb(struct inode *inode,
81 			const char *val,
82 			unsigned int len);
83 ssize_t user_dlm_read_lvb(struct inode *inode,
84 			  char *val,
85 			  unsigned int len);
86 struct ocfs2_cluster_connection *user_dlm_register(const struct qstr *name);
87 void user_dlm_unregister(struct ocfs2_cluster_connection *conn);
88 void user_dlm_set_locking_protocol(void);
89 
90 struct 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 
99 static inline struct dlmfs_inode_private *
DLMFS_I(struct inode * inode)100 DLMFS_I(struct inode *inode)
101 {
102         return container_of(inode,
103 			    struct dlmfs_inode_private,
104 			    ip_vfs_inode);
105 }
106 
107 struct dlmfs_filp_private {
108 	int                  fp_lock_level;
109 };
110 
111 #define DLMFS_MAGIC	0x76a9f425
112 
113 #endif /* USERDLM_H */
114