Root/fs/ocfs2/uptodate.h

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 */
33struct 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
58int __init init_ocfs2_uptodate_cache(void);
59void exit_ocfs2_uptodate_cache(void);
60
61void ocfs2_metadata_cache_init(struct ocfs2_caching_info *ci,
62                   const struct ocfs2_caching_operations *ops);
63void ocfs2_metadata_cache_purge(struct ocfs2_caching_info *ci);
64void ocfs2_metadata_cache_exit(struct ocfs2_caching_info *ci);
65
66u64 ocfs2_metadata_cache_owner(struct ocfs2_caching_info *ci);
67void ocfs2_metadata_cache_io_lock(struct ocfs2_caching_info *ci);
68void ocfs2_metadata_cache_io_unlock(struct ocfs2_caching_info *ci);
69
70int ocfs2_buffer_uptodate(struct ocfs2_caching_info *ci,
71              struct buffer_head *bh);
72void ocfs2_set_buffer_uptodate(struct ocfs2_caching_info *ci,
73                   struct buffer_head *bh);
74void ocfs2_set_new_buffer_uptodate(struct ocfs2_caching_info *ci,
75                   struct buffer_head *bh);
76void ocfs2_remove_from_cache(struct ocfs2_caching_info *ci,
77                 struct buffer_head *bh);
78void ocfs2_remove_xattr_clusters_from_cache(struct ocfs2_caching_info *ci,
79                        sector_t block,
80                        u32 c_len);
81int ocfs2_buffer_read_ahead(struct ocfs2_caching_info *ci,
82                struct buffer_head *bh);
83
84#endif /* OCFS2_UPTODATE_H */
85

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