release/src-rt-6.x.4708/linux/linux-2.6.36/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  */
  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 */