1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * dlmglue.h
5 *
6 * description here
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 DLMGLUE_H
28 #define DLMGLUE_H
29
30 #include "dcache.h"
31
32 #define OCFS2_LVB_VERSION 5
33
34 struct ocfs2_meta_lvb {
35 __u8 lvb_version;
36 __u8 lvb_reserved0;
37 __be16 lvb_idynfeatures;
38 __be32 lvb_iclusters;
39 __be32 lvb_iuid;
40 __be32 lvb_igid;
41 __be64 lvb_iatime_packed;
42 __be64 lvb_ictime_packed;
43 __be64 lvb_imtime_packed;
44 __be64 lvb_isize;
45 __be16 lvb_imode;
46 __be16 lvb_inlink;
47 __be32 lvb_iattr;
48 __be32 lvb_igeneration;
49 __be32 lvb_reserved2;
50 };
51
52 /* ocfs2_inode_lock_full() 'arg_flags' flags */
53 /* don't wait on recovery. */
54 #define OCFS2_META_LOCK_RECOVERY (0x01)
55 /* Instruct the dlm not to queue ourselves on the other node. */
56 #define OCFS2_META_LOCK_NOQUEUE (0x02)
57 /* don't block waiting for the downconvert thread, instead return -EAGAIN */
58 #define OCFS2_LOCK_NONBLOCK (0x04)
59
60 int ocfs2_dlm_init(struct ocfs2_super *osb);
61 void ocfs2_dlm_shutdown(struct ocfs2_super *osb);
62 void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res);
63 void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res,
64 enum ocfs2_lock_type type,
65 unsigned int generation,
66 struct inode *inode);
67 void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl,
68 u64 parent, struct inode *inode);
69 struct ocfs2_file_private;
70 void ocfs2_file_lock_res_init(struct ocfs2_lock_res *lockres,
71 struct ocfs2_file_private *fp);
72 void ocfs2_lock_res_free(struct ocfs2_lock_res *res);
73 int ocfs2_create_new_inode_locks(struct inode *inode);
74 int ocfs2_drop_inode_locks(struct inode *inode);
75 int ocfs2_rw_lock(struct inode *inode, int write);
76 void ocfs2_rw_unlock(struct inode *inode, int write);
77 int ocfs2_open_lock(struct inode *inode);
78 int ocfs2_try_open_lock(struct inode *inode, int write);
79 void ocfs2_open_unlock(struct inode *inode);
80 int ocfs2_inode_lock_atime(struct inode *inode,
81 struct vfsmount *vfsmnt,
82 int *level);
83 int ocfs2_inode_lock_full(struct inode *inode,
84 struct buffer_head **ret_bh,
85 int ex,
86 int arg_flags);
87 int ocfs2_inode_lock_with_page(struct inode *inode,
88 struct buffer_head **ret_bh,
89 int ex,
90 struct page *page);
91 /* 99% of the time we don't want to supply any additional flags --
92 * those are for very specific cases only. */
93 #define ocfs2_inode_lock(i, b, e) ocfs2_inode_lock_full(i, b, e, 0)
94 void ocfs2_inode_unlock(struct inode *inode,
95 int ex);
96 int ocfs2_super_lock(struct ocfs2_super *osb,
97 int ex);
98 void ocfs2_super_unlock(struct ocfs2_super *osb,
99 int ex);
100 int ocfs2_rename_lock(struct ocfs2_super *osb);
101 void ocfs2_rename_unlock(struct ocfs2_super *osb);
102 int ocfs2_dentry_lock(struct dentry *dentry, int ex);
103 void ocfs2_dentry_unlock(struct dentry *dentry, int ex);
104 int ocfs2_file_lock(struct file *file, int ex, int trylock);
105 void ocfs2_file_unlock(struct file *file);
106
107 void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres);
108 void ocfs2_simple_drop_lockres(struct ocfs2_super *osb,
109 struct ocfs2_lock_res *lockres);
110
111 /* for the downconvert thread */
112 void ocfs2_wake_downconvert_thread(struct ocfs2_super *osb);
113
114 struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void);
115 void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug);
116
117 extern const struct dlm_protocol_version ocfs2_locking_protocol;
118 #endif /* DLMGLUE_H */
119
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