Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
uptodate.h
Go to the documentation of this file.
1 /* -*- mode: c; c-basic-offset: 8; -*-
2  * vim: noexpandtab sw=8 ts=8 sts=0:
3  *
4  * uptodate.h
5  *
6  * Cluster uptodate tracking
7  *
8  * Copyright (C) 2002, 2004, 2005 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 #ifndef OCFS2_UPTODATE_H
27 #define OCFS2_UPTODATE_H
28 
29 /*
30  * The caching code relies on locking provided by the user of
31  * struct ocfs2_caching_info. These operations connect that up.
32  */
33 struct ocfs2_caching_operations {
34  /*
35  * A u64 representing the owning structure. Usually this
36  * is the block number (i_blkno or whatnot). This is used so
37  * that caching log messages can identify the owning structure.
38  */
39  u64 (*co_owner)(struct ocfs2_caching_info *ci);
40 
41  /* The superblock is needed during I/O. */
42  struct super_block *(*co_get_super)(struct ocfs2_caching_info *ci);
43  /*
44  * Lock and unlock the caching data. These will not sleep, and
45  * should probably be spinlocks.
46  */
47  void (*co_cache_lock)(struct ocfs2_caching_info *ci);
48  void (*co_cache_unlock)(struct ocfs2_caching_info *ci);
49 
50  /*
51  * Lock and unlock for disk I/O. These will sleep, and should
52  * be mutexes.
53  */
54  void (*co_io_lock)(struct ocfs2_caching_info *ci);
55  void (*co_io_unlock)(struct ocfs2_caching_info *ci);
56 };
57 
58 int __init init_ocfs2_uptodate_cache(void);
59 void exit_ocfs2_uptodate_cache(void);
60 
61 void ocfs2_metadata_cache_init(struct ocfs2_caching_info *ci,
62  const struct ocfs2_caching_operations *ops);
63 void ocfs2_metadata_cache_purge(struct ocfs2_caching_info *ci);
64 void ocfs2_metadata_cache_exit(struct ocfs2_caching_info *ci);
65 
66 u64 ocfs2_metadata_cache_owner(struct ocfs2_caching_info *ci);
67 void ocfs2_metadata_cache_io_lock(struct ocfs2_caching_info *ci);
68 void ocfs2_metadata_cache_io_unlock(struct ocfs2_caching_info *ci);
69 
70 int ocfs2_buffer_uptodate(struct ocfs2_caching_info *ci,
71  struct buffer_head *bh);
72 void ocfs2_set_buffer_uptodate(struct ocfs2_caching_info *ci,
73  struct buffer_head *bh);
74 void ocfs2_set_new_buffer_uptodate(struct ocfs2_caching_info *ci,
75  struct buffer_head *bh);
76 void ocfs2_remove_from_cache(struct ocfs2_caching_info *ci,
77  struct buffer_head *bh);
78 void ocfs2_remove_xattr_clusters_from_cache(struct ocfs2_caching_info *ci,
79  sector_t block,
80  u32 c_len);
81 int ocfs2_buffer_read_ahead(struct ocfs2_caching_info *ci,
82  struct buffer_head *bh);
83 
84 #endif /* OCFS2_UPTODATE_H */
Generated on Thu Jan 10 2013 14:49:38 for Linux Kernel by   doxygen 1.8.2