linux/fs/ocfs2/uptodate.h
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   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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