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