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 
33 struct 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 
54 extern struct workqueue_struct *user_dlm_worker;
55 
56 void user_dlm_lock_res_init(struct user_lock_res *lockres,
57 			    struct dentry *dentry);
58 int user_dlm_destroy_lock(struct user_lock_res *lockres);
59 int user_dlm_cluster_lock(struct user_lock_res *lockres,
60 			  int level,
61 			  int lkm_flags);
62 void user_dlm_cluster_unlock(struct user_lock_res *lockres,
63 			     int level);
64 void user_dlm_write_lvb(struct inode *inode,
65 			const char *val,
66 			unsigned int len);
67 bool user_dlm_read_lvb(struct inode *inode, char *val);
68 struct ocfs2_cluster_connection *user_dlm_register(const struct qstr *name);
69 void user_dlm_unregister(struct ocfs2_cluster_connection *conn);
70 void user_dlm_set_locking_protocol(void);
71 
72 struct 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 
81 static inline struct dlmfs_inode_private *
DLMFS_I(struct inode * inode)82 DLMFS_I(struct inode *inode)
83 {
84         return container_of(inode,
85 			    struct dlmfs_inode_private,
86 			    ip_vfs_inode);
87 }
88 
89 struct dlmfs_filp_private {
90 	int                  fp_lock_level;
91 };
92 
93 #define DLMFS_MAGIC	0x76a9f425
94 
95 #endif /* USERDLM_H */
96