Root/fs/ocfs2/dlmglue.h

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
34struct 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
54struct 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
67struct 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 */
82enum {
83    OI_LS_NORMAL = 0,
84    OI_LS_PARENT,
85    OI_LS_RENAME1,
86    OI_LS_RENAME2,
87};
88
89int ocfs2_dlm_init(struct ocfs2_super *osb);
90void ocfs2_dlm_shutdown(struct ocfs2_super *osb, int hangup_pending);
91void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res);
92void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res,
93                   enum ocfs2_lock_type type,
94                   unsigned int generation,
95                   struct inode *inode);
96void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl,
97                u64 parent, struct inode *inode);
98struct ocfs2_file_private;
99void ocfs2_file_lock_res_init(struct ocfs2_lock_res *lockres,
100                  struct ocfs2_file_private *fp);
101struct ocfs2_mem_dqinfo;
102void ocfs2_qinfo_lock_res_init(struct ocfs2_lock_res *lockres,
103                               struct ocfs2_mem_dqinfo *info);
104void ocfs2_refcount_lock_res_init(struct ocfs2_lock_res *lockres,
105                  struct ocfs2_super *osb, u64 ref_blkno,
106                  unsigned int generation);
107void ocfs2_lock_res_free(struct ocfs2_lock_res *res);
108int ocfs2_create_new_inode_locks(struct inode *inode);
109int ocfs2_drop_inode_locks(struct inode *inode);
110int ocfs2_rw_lock(struct inode *inode, int write);
111void ocfs2_rw_unlock(struct inode *inode, int write);
112int ocfs2_open_lock(struct inode *inode);
113int ocfs2_try_open_lock(struct inode *inode, int write);
114void ocfs2_open_unlock(struct inode *inode);
115int ocfs2_inode_lock_atime(struct inode *inode,
116              struct vfsmount *vfsmnt,
117              int *level);
118int ocfs2_inode_lock_full_nested(struct inode *inode,
119             struct buffer_head **ret_bh,
120             int ex,
121             int arg_flags,
122             int subclass);
123int ocfs2_inode_lock_with_page(struct inode *inode,
124                  struct buffer_head **ret_bh,
125                  int ex,
126                  struct page *page);
127/* Variants without special locking class or flags */
128#define ocfs2_inode_lock_full(i, r, e, f)\
129        ocfs2_inode_lock_full_nested(i, r, e, f, OI_LS_NORMAL)
130#define ocfs2_inode_lock_nested(i, b, e, s)\
131        ocfs2_inode_lock_full_nested(i, b, e, 0, s)
132/* 99% of the time we don't want to supply any additional flags --
133 * those are for very specific cases only. */
134#define ocfs2_inode_lock(i, b, e) ocfs2_inode_lock_full_nested(i, b, e, 0, OI_LS_NORMAL)
135void ocfs2_inode_unlock(struct inode *inode,
136               int ex);
137int ocfs2_super_lock(struct ocfs2_super *osb,
138             int ex);
139void ocfs2_super_unlock(struct ocfs2_super *osb,
140            int ex);
141int ocfs2_orphan_scan_lock(struct ocfs2_super *osb, u32 *seqno);
142void ocfs2_orphan_scan_unlock(struct ocfs2_super *osb, u32 seqno);
143
144int ocfs2_rename_lock(struct ocfs2_super *osb);
145void ocfs2_rename_unlock(struct ocfs2_super *osb);
146int ocfs2_nfs_sync_lock(struct ocfs2_super *osb, int ex);
147void ocfs2_nfs_sync_unlock(struct ocfs2_super *osb, int ex);
148int ocfs2_dentry_lock(struct dentry *dentry, int ex);
149void ocfs2_dentry_unlock(struct dentry *dentry, int ex);
150int ocfs2_file_lock(struct file *file, int ex, int trylock);
151void ocfs2_file_unlock(struct file *file);
152int ocfs2_qinfo_lock(struct ocfs2_mem_dqinfo *oinfo, int ex);
153void ocfs2_qinfo_unlock(struct ocfs2_mem_dqinfo *oinfo, int ex);
154struct ocfs2_refcount_tree;
155int ocfs2_refcount_lock(struct ocfs2_refcount_tree *ref_tree, int ex);
156void ocfs2_refcount_unlock(struct ocfs2_refcount_tree *ref_tree, int ex);
157
158
159void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres);
160void ocfs2_simple_drop_lockres(struct ocfs2_super *osb,
161                   struct ocfs2_lock_res *lockres);
162
163/* for the downconvert thread */
164void ocfs2_wake_downconvert_thread(struct ocfs2_super *osb);
165
166struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void);
167void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug);
168
169/* To set the locking protocol on module initialization */
170void ocfs2_set_locking_protocol(void);
171#endif /* DLMGLUE_H */
172

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