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   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * ocfs2_buffer_head.h
   5  *
   6  * Buffer cache handling functions defined
   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 #ifndef OCFS2_BUFFER_HEAD_IO_H
  27 #define OCFS2_BUFFER_HEAD_IO_H
  28
  29 #include <linux/buffer_head.h>
  30
  31 void ocfs2_end_buffer_io_sync(struct buffer_head *bh,
  32                              int uptodate);
  33
  34 static inline int ocfs2_read_block(struct inode        *inode,
  35                                    u64                  off,
  36                                    struct buffer_head **bh);
  37
  38 int ocfs2_write_block(struct ocfs2_super          *osb,
  39                       struct buffer_head  *bh,
  40                       struct inode        *inode);
  41 int ocfs2_read_blocks(struct inode        *inode,
  42                       u64                  block,
  43                       int                  nr,
  44                       struct buffer_head  *bhs[],
  45                       int                  flags);
  46 int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block,
  47                            unsigned int nr, struct buffer_head *bhs[]);
  48
  49 int ocfs2_write_super_or_backup(struct ocfs2_super *osb,
  50                                 struct buffer_head *bh);
  51
  52 #define OCFS2_BH_CACHED            1
  53 #define OCFS2_BH_READAHEAD         8
  54
  55 static inline int ocfs2_read_block(struct inode *inode, u64 off,
  56                                    struct buffer_head **bh)
  57 {
  58         int status = 0;
  59
  60         if (bh == NULL) {
  61                 printk("ocfs2: bh == NULL\n");
  62                 status = -EINVAL;
  63                 goto bail;
  64         }
  65
  66         status = ocfs2_read_blocks(inode, off, 1, bh, OCFS2_BH_CACHED);
  67
  68 bail:
  69         return status;
  70 }
  71
  72 #endif /* OCFS2_BUFFER_HEAD_IO_H */