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 4
33
34struct ocfs2_meta_lvb {
35	__u8         lvb_version;
36	__u8         lvb_reserved0;
37	__be16       lvb_reserved1;
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_meta_lock_full() and ocfs2_data_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 vote thread, instead return -EAGAIN */
58#define OCFS2_LOCK_NONBLOCK		(0x04)
59
60int ocfs2_dlm_init(struct ocfs2_super *osb);
61void ocfs2_dlm_shutdown(struct ocfs2_super *osb);
62void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res);
63void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res,
64			       enum ocfs2_lock_type type,
65			       unsigned int generation,
66			       struct inode *inode);
67void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl,
68				u64 parent, struct inode *inode);
69void ocfs2_lock_res_free(struct ocfs2_lock_res *res);
70int ocfs2_create_new_inode_locks(struct inode *inode);
71int ocfs2_drop_inode_locks(struct inode *inode);
72int ocfs2_data_lock_full(struct inode *inode,
73			 int write,
74			 int arg_flags);
75#define ocfs2_data_lock(inode, write) ocfs2_data_lock_full(inode, write, 0)
76int ocfs2_data_lock_with_page(struct inode *inode,
77			      int write,
78			      struct page *page);
79void ocfs2_data_unlock(struct inode *inode,
80		       int write);
81int ocfs2_rw_lock(struct inode *inode, int write);
82void ocfs2_rw_unlock(struct inode *inode, int write);
83int ocfs2_open_lock(struct inode *inode);
84int ocfs2_try_open_lock(struct inode *inode, int write);
85void ocfs2_open_unlock(struct inode *inode);
86int ocfs2_meta_lock_atime(struct inode *inode,
87			  struct vfsmount *vfsmnt,
88			  int *level);
89int ocfs2_meta_lock_full(struct inode *inode,
90			 struct buffer_head **ret_bh,
91			 int ex,
92			 int arg_flags);
93int ocfs2_meta_lock_with_page(struct inode *inode,
94			      struct buffer_head **ret_bh,
95			      int ex,
96			      struct page *page);
97/* 99% of the time we don't want to supply any additional flags --
98 * those are for very specific cases only. */
99#define ocfs2_meta_lock(i, b, e) ocfs2_meta_lock_full(i, b, e, 0)
100void ocfs2_meta_unlock(struct inode *inode,
101		       int ex);
102int ocfs2_super_lock(struct ocfs2_super *osb,
103		     int ex);
104void ocfs2_super_unlock(struct ocfs2_super *osb,
105			int ex);
106int ocfs2_rename_lock(struct ocfs2_super *osb);
107void ocfs2_rename_unlock(struct ocfs2_super *osb);
108int ocfs2_dentry_lock(struct dentry *dentry, int ex);
109void ocfs2_dentry_unlock(struct dentry *dentry, int ex);
110
111void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres);
112void ocfs2_simple_drop_lockres(struct ocfs2_super *osb,
113			       struct ocfs2_lock_res *lockres);
114
115/* for the vote thread */
116void ocfs2_process_blocked_lock(struct ocfs2_super *osb,
117				struct ocfs2_lock_res *lockres);
118
119struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void);
120void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug);
121
122#endif	/* DLMGLUE_H */
123