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 #define OCFS2_QINFO_LVB_VERSION 1
53
54 struct ocfs2_qinfo_lvb {
55 __u8 lvb_version;
56 __u8 lvb_reserved[3];
57 __be32 lvb_bgrace;
58 __be32 lvb_igrace;
59 __be32 lvb_syncms;
60 __be32 lvb_blocks;
61 __be32 lvb_free_blk;
62 __be32 lvb_free_entry;
63 };
64
65 #define OCFS2_ORPHAN_LVB_VERSION 1
66
67 struct ocfs2_orphan_scan_lvb {
68 __u8 lvb_version;
69 __u8 lvb_reserved[3];
70 __be32 lvb_os_seqno;
71 };
72
73 /* ocfs2_inode_lock_full() 'arg_flags' flags */
74 /* don't wait on recovery. */
75 #define OCFS2_META_LOCK_RECOVERY (0x01)
76 /* Instruct the dlm not to queue ourselves on the other node. */
77 #define OCFS2_META_LOCK_NOQUEUE (0x02)
78 /* don't block waiting for the downconvert thread, instead return -EAGAIN */
79 #define OCFS2_LOCK_NONBLOCK (0x04)
80
81 /* Locking subclasses of inode cluster lock */
82 enum {
83 OI_LS_NORMAL = 0,
84 OI_LS_PARENT,
85 OI_LS_RENAME1,
86 OI_LS_RENAME2,
87 };
88
89 int ocfs2_dlm_init(struct ocfs2_super *osb);
90 void ocfs2_dlm_shutdown(struct ocfs2_super *osb, int hangup_pending);
91 void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res);
92 void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res,
93 enum ocfs2_lock_type type,
94 unsigned int generation,
95 struct inode *inode);
96 void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl,
97 u64 parent, struct inode *inode);
98 struct ocfs2_file_private;
99 void ocfs2_file_lock_res_init(struct ocfs2_lock_res *lockres,
100 struct ocfs2_file_private *fp);
101 struct ocfs2_mem_dqinfo;
102 void ocfs2_qinfo_lock_res_init(struct ocfs2_lock_res *lockres,
103 struct ocfs2_mem_dqinfo *info);
104 void ocfs2_lock_res_free(struct ocfs2_lock_res *res);
105 int ocfs2_create_new_inode_locks(struct inode *inode);
106 int ocfs2_drop_inode_locks(struct inode *inode);
107 int ocfs2_rw_lock(struct inode *inode, int write);
108 void ocfs2_rw_unlock(struct inode *inode, int write);
109 int ocfs2_open_lock(struct inode *inode);
110 int ocfs2_try_open_lock(struct inode *inode, int write);
111 void ocfs2_open_unlock(struct inode *inode);
112 int ocfs2_inode_lock_atime(struct inode *inode,
113 struct vfsmount *vfsmnt,
114 int *level);
115 int ocfs2_inode_lock_full_nested(struct inode *inode,
116 struct buffer_head **ret_bh,
117 int ex,
118 int arg_flags,
119 int subclass);
120 int ocfs2_inode_lock_with_page(struct inode *inode,
121 struct buffer_head **ret_bh,
122 int ex,
123 struct page *page);
124 /* Variants without special locking class or flags */
125 #define ocfs2_inode_lock_full(i, r, e, f)\
126 ocfs2_inode_lock_full_nested(i, r, e, f, OI_LS_NORMAL)
127 #define ocfs2_inode_lock_nested(i, b, e, s)\
128 ocfs2_inode_lock_full_nested(i, b, e, 0, s)
129 /* 99% of the time we don't want to supply any additional flags --
130 * those are for very specific cases only. */
131 #define ocfs2_inode_lock(i, b, e) ocfs2_inode_lock_full_nested(i, b, e, 0, OI_LS_NORMAL)
132 void ocfs2_inode_unlock(struct inode *inode,
133 int ex);
134 int ocfs2_super_lock(struct ocfs2_super *osb,
135 int ex);
136 void ocfs2_super_unlock(struct ocfs2_super *osb,
137 int ex);
138 int ocfs2_orphan_scan_lock(struct ocfs2_super *osb, u32 *seqno);
139 void ocfs2_orphan_scan_unlock(struct ocfs2_super *osb, u32 seqno);
140
141 int ocfs2_rename_lock(struct ocfs2_super *osb);
142 void ocfs2_rename_unlock(struct ocfs2_super *osb);
143 int ocfs2_nfs_sync_lock(struct ocfs2_super *osb, int ex);
144 void ocfs2_nfs_sync_unlock(struct ocfs2_super *osb, int ex);
145 int ocfs2_dentry_lock(struct dentry *dentry, int ex);
146 void ocfs2_dentry_unlock(struct dentry *dentry, int ex);
147 int ocfs2_file_lock(struct file *file, int ex, int trylock);
148 void ocfs2_file_unlock(struct file *file);
149 int ocfs2_qinfo_lock(struct ocfs2_mem_dqinfo *oinfo, int ex);
150 void ocfs2_qinfo_unlock(struct ocfs2_mem_dqinfo *oinfo, int ex);
151
152
153 void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres);
154 void ocfs2_simple_drop_lockres(struct ocfs2_super *osb,
155 struct ocfs2_lock_res *lockres);
156
157 /* for the downconvert thread */
158 void ocfs2_wake_downconvert_thread(struct ocfs2_super *osb);
159
160 struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void);
161 void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug);
162
163 /* To set the locking protocol on module initialization */
164 void ocfs2_set_locking_protocol(void);
165 #endif /* DLMGLUE_H */
166
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